Compressor with a deformable groove

Abstract

A compressor includes a deformable groove spaced apart from a key groove and deformable to reduce an impact force or stress generated at an Oldham's ring.

Claims

1. A compressor comprising: a casing configured to accommodate refrigerant; a driver coupled to an inner circumferential surface of the casing and configured to rotate a rotatable shaft; and a compression assembly coupled to the rotatable shaft and configured to compress the refrigerant in the casing, the compression assembly comprising: an orbiting scroll coupled to the rotatable shaft and configured to perform an orbiting motion based on rotation of the rotatable shaft, a fixed scroll engaged with the orbiting scroll and configured to receive the refrigerant and to compress the refrigerant based on the orbiting motion of the orbiting scroll, the fixed scroll being configured to discharge the refrigerant, a main frame that is disposed on the fixed scroll and accommodates the orbiting scroll therein, wherein the rotatable shaft passes through the main frame, and an Oldham's ring comprising: a ring body that is disposed between the orbiting scroll and the main frame, a first key that protrudes from the ring body and is coupled to the orbiting scroll, wherein the orbiting scroll defines a first key groove that accommodates the first key therein and that is configured to contact the first key based on rotation of the rotatable shaft, and a second key that protrudes from the ring body and is coupled to the main frame, wherein the main frame defines a second key groove that accommodates the second key therein and that is configured to contact the second key based on rotation of the rotatable shaft, and wherein the first and second keys are configured to prevent a spinning motion of the orbiting scroll, wherein at least one of the orbiting scroll or the main frame defines a deformable groove that is spaced apart from the first key groove and the second key groove, the deformable groove being recessed from the at least one of the orbiting scroll or the main frame.

2. The compressor of claim 1, wherein the first key groove has a first contact point disposed at an inner surface of the first key groove and configured to contact the first key based on rotation of the rotatable shaft, wherein the second key groove has a second contact point disposed at an inner surface of the second key groove and configured to contact the second key based on rotation of the rotatable shaft, and wherein the deformable groove extends parallel to the first key groove or the second key groove and is configured to deform at a position corresponding to the first contact point or the second contact point based on rotation of the rotatable shaft.

3. The compressor of claim 1, wherein each of the first key groove, the second key groove, and the deformable groove is recessed in a axial direction of the rotatable shaft, and wherein a depth of each of the first key groove and the second key groove in the axial direction is less than a depth of the deformable groove in the axial direction.

4. The compressor of claim 1, wherein the deformable groove extends in a radial direction of the orbiting scroll or the main frame, and wherein a length of the deformable groove in the radial direction is greater than a width of the deformable groove in a width direction perpendicular to the radial direction.

5. The compressor of claim 4, wherein the deformable groove comprises a curved surface configured to deform based on rotation of the rotatable shaft.

6. The compressor of claim 5, wherein the curved surface is disposed at an end of the deformable groove in the radial direction.

7. The compressor of claim 1, wherein the compression assembly further comprises an impact-force dissipating member disposed in the deformable groove and made of a polymer material or rubber.

8. The compressor of claim 7, wherein the first key groove has a first contact point disposed at an inner surface of the first key groove and configured to contact the first key based on rotation of the rotatable shaft, wherein the second key groove has a second contact point disposed at an inner surface of the second key groove and configured to contact the second key based on rotation of the rotatable shaft, and wherein the impact-force dissipating member is disposed in the deformable groove at position corresponding to the first contact point or the second contact point.

9. The compressor of claim 1, wherein the main frame comprises: a main end plate that receives the rotatable shaft; and a main side plate that protrudes from the main end plate toward the fixed scroll and is supported on the fixed scroll, and wherein the second key groove is a main key groove defined in the main end plate.

10. The compressor of claim 9, wherein the main end plate has: a first surface in contact with the ring body; a second surface that is opposite to the first surface of the main end plate and spaced apart from the ring body; and an outer side surface that extends between the first surface and the second surface of the main end plate and is connected to an outer surface of the main side plate, and wherein the deformable groove comprises a main deformable groove that is defined in the main end plate, that extends parallel to the main key groove, and that is spaced apart from the outer side surface of the main end plate.

11. The compressor of claim 10, wherein the main key groove has: a first plane; and a second plane that is spaced apart from the first plane and extends parallel to the first plane, wherein the main deformable groove comprises a first main deformable groove disposed closer to the first plane than to the second plane, and a second main deformable groove disposed closer to the second plane than to the first plane, and wherein the main key groove is disposed between the first main deformable groove and the second main deformable groove.

12. The compressor of claim 11, wherein each of the first plane, the second plane, the first main deformable groove, and the second main deformable groove extends in a radial direction of the main frame.

13. The compressor of claim 11, wherein each of the first main deformable groove and the second main deformable groove extends from an inner end to an outer end toward the outer side surface, and wherein a first spacing between the outer end of the first main deformable groove and the outer side surface is different from a second spacing between the outer end of the second main deformable groove and the outer side surface.

14. The compressor of claim 1, wherein the orbiting scroll comprises: an orbiting end plate disposed between the main frame and the fixed scroll; and an orbiting wrap that extends from the orbiting end plate toward the fixed scroll and defines a compression chamber together with the fixed scroll, the compression chamber being configured to receive and compress the refrigerant, and wherein the first key groove is an orbiting key groove defined in the orbiting end plate.

15. The compressor of claim 14, wherein the orbiting end plate has: a first surface in contact with the ring body; a second surface that is opposite to the first surface and spaced apart from the first surface, wherein the orbiting wrap extends from the second surface; and an outer side surface that extends between the first surface and the second surface of the orbiting end plate, and wherein the deformable groove comprises an orbiting deformable groove that is defined in the orbiting end plate, that extends parallel to the orbiting key groove, and that is spaced apart from the outer side surface of the orbiting end plate.

16. The compressor of claim 14, wherein the orbiting end plate has: a first surface in contact with the ring body; a second surface that is opposite to the first surface and spaced apart from the first surface, wherein the orbiting wrap extends from the second surface; and an outer side surface that extends between the first surface and the second surface of the orbiting end plate, and wherein the deformable groove is defined in the orbiting end plate, extends in a parallel manner to the orbiting key groove, and passes through the outer side surface.

17. The compressor of claim 16, wherein the deformable groove is recessed from the outer side surface of the orbiting end plate and extends radially inward along a radial direction of the orbiting end plate.

18. The compressor of claim 15, wherein the orbiting key groove has: a first plane; and a second plane that is spaced apart from the first plane and extends parallel to the first plane, wherein the orbiting deformable groove comprises a first orbiting deformable groove disposed closer to the first plane than to the second plane, and a second orbiting deformable groove disposed closer to the second plane than to the first plane, and wherein the orbiting key groove is disposed between the first orbiting deformable groove and the second orbiting deformable groove.

19. The compressor of claim 18, wherein each of the first orbiting deformable groove and the second orbiting deformable groove extends from an inner end to an outer end toward the outer side surface, and wherein a first spacing between the outer end of the first orbiting deformable groove and the outer side surface is different from a second spacing between the outer end of the second orbiting deformable groove and the outer side surface.

20. The compressor of claim 1, wherein the main frame comprises: a main end plate that receives the rotatable shaft; and a main side plate that protrudes from the main end plate toward the fixed scroll and is supported on the fixed scroll, wherein the second key groove is a main key groove defined in the main end plate, and wherein the deformable groove comprises at least one main deformable groove that is defined in the main end plate and spaced apart from the main key groove.

21. The compressor of claim 20, wherein the at least one main deformable groove comprises main deformable grooves that are disposed on both sides of the main key groove and spaced apart from the main key groove.

22. The compressor of claim 1, wherein the orbiting scroll comprises: an orbiting end plate disposed between the main frame and the fixed scroll; and an orbiting wrap that extends from the orbiting end plate toward the fixed scroll and defines a compression chamber together with the fixed scroll, the compression chamber being configured to receive and compress the refrigerant, wherein the first key groove is an orbiting key groove defined in the orbiting end plate, and wherein the deformable groove comprises at least one orbiting deformable groove that is defined in the orbiting end plate and spaced apart from the orbiting key groove.

23. The compressor of claim 22, wherein the at least one orbiting deformable groove comprises orbiting deformable grooves that are disposed on both sides of the orbiting key groove and spaced apart from the orbiting key groove.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a diagram showing a lower scroll compressor according to one embodiment of the present disclosure.

(2) FIGS. 2A to 2C are diagrams showing an operating principle of a compression assembly according to one embodiment of the present disclosure.

(3) FIG. 3 is a diagram showing a portion of the Oldham's ring on which an impact force is concentrated.

(4) FIG. 4 is a diagram showing a deformable groove according to one embodiment of the present disclosure.

(5) FIGS. 5A to 5C are diagrams showing a principle of reducing the impact force using the deformable groove and an impact-force dissipating member according to one embodiment of the present disclosure,

(6) FIGS. 6A to 6C are diagrams showing an embodiment in which a shape of the deformable groove according to the present disclosure is changed.

(7) FIG. 7 is a diagram showing a portion where the impact force generated in the Oldham's ring is intensively transmitted to a key groove.

(8) FIGS. 8A and 8B are diagrams showing a state in which the impact-force dissipating member is installed in the key groove according to one embodiment of the present disclosure.

(9) FIGS. 9A and 9B are diagrams showing a state in which a position of the deformable groove is changed according to one embodiment of the present disclosure.

DETAILED DESCRIPTIONS

(10) For simplicity and clarity of illustration, elements in the figures are not necessarily drawn to scale. The same reference numbers in different figures denote the same or similar elements, and as such perform similar functionality. Furthermore, in the following detailed description of the present disclosure, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure. However, it will be understood that the present disclosure may be practiced without these specific details. In other instances, well-known methods, procedures, components, and circuits have not been described in detail so as not to unnecessarily obscure aspects of the present disclosure.

(11) Examples of various embodiments are illustrated and described further below. It will be understood that the description herein is not intended to limit the present disclosure to the specific embodiments as described. On the contrary, it is intended to cover alternatives, modifications, and equivalents as may be included within the spirit and scope of the present disclosure as defined by the appended claims.

(12) The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used herein, the singular forms “a” and “an” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises”, “comprising”, “includes”, and “including” when used in this specification, specify the presence of the stated features, integers, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, operations, elements, components, and/or portions thereof. As used herein, the term “and/or” includes any and all combinations of one or greater of the associated listed items. Expression such as “at least one of” when preceding a list of elements may modify the entire list of elements and may not modify the individual elements of the list.

(13) It will be understood that, although the terms “first”, “second”, “third”, and so on may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section described below could be termed a second element, component, region, layer or section, without departing from the spirit and scope of the present disclosure.

(14) In addition, it will also be understood that when a first element or layer is referred to as being present “on” or “beneath” a second element or layer, the first element may be disposed directly on or beneath the second element or may be disposed indirectly on or beneath the second element with a third element or layer being disposed between the first and second elements or layers. It will be understood that when an element or layer is referred to as being “connected to”, or “coupled to” another element or layer, it may be directly on, connected to, or coupled to the other element or layer, or one or more intervening elements or layers may be present. In addition, it will also be understood that when an element or layer is referred to as being “between” two elements or layers, it may be the only element or layer between the two elements or layers, or one or more intervening elements or layers may be present.

(15) Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this inventive concept belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

(16) FIG. 1 is a diagram showing a basic structure of a lower scroll compressor 10 according to one embodiment of the present disclosure.

(17) Referring to FIG. 1, the lower scroll compressor 10 according to an embodiment of the present disclosure may include a casing 100 having therein a space in which fluid is stored or flows, a driver 200 coupled to an inner circumferential face of the casing 100 to rotate a rotatable shaft 230, and a compression assembly 300 coupled to the rotatable shaft 230 inside the casing and compressing the fluid.

(18) Specifically, the casing 100 may include a refrigerant inlet 122 into which refrigerant is introduced and a refrigerant discharger 121 through which the refrigerant is discharged. The casing 100 may include a receiving shell 110 having a cylindrical shape and receiving the driver 200 and the compression assembly 300 therein, and having the refrigerant inlet 122, a discharge shell 120 coupled to one end of the receiving shell 110 and having the refrigerant discharger 121, and a sealing shell 130 coupled to the other end of the receiving shell 110 to seal the receiving shell 110.

(19) The driver 200 includes a stator 210 for generating a rotating magnetic field, and a rotor 220 disposed to rotate by the rotating magnetic field. The rotatable shaft 230 may be coupled to the rotor 220 to be rotated together with the rotation of the rotor 220.

(20) The stator 210 has a plurality of slots defined in an inner circumferential face thereof along a circumferential direction and a coil is wound in and along the plurality of slots, thereby to generate a rotating magnetic field. The stator may be fixedly disposed on the inner circumferential face of the receiving shell 110. The rotor 220 may have a plurality of magnets (permanent magnets) received therein configured to react to the rotating magnetic field. The rotor 220 may be rotatably accommodated inside the stator 210. The rotatable shaft 230 passes through a center of the rotor 220 and coupled thereto, so that when the rotor 220 rotates using the rotating magnetic field, the shaft 230 rotates together with the rotation of the rotor 220.

(21) The compression assembly 300 may include a fixed scroll 320 fixed to the inner circumferential face of the receiving shell 110. The driver 200 is disposed between the refrigerant discharger 121 and the fixed scroll 320. The compression assembly 300 may include an orbiting scroll 330 coupled to the rotatable shaft 230 and engaged with the fixed scroll 320 to define a compression chamber. The compression assembly 300 may include a main frame 310 seated on the fixed scroll 320 and receive therein the orbiting scroll 330.

(22) The lower scroll compressor 10 according to an embodiment of the present disclosure has the driver 200 disposed between the refrigerant discharger 121 and the compression assembly 300. Thus, when the refrigerant discharger 121 is disposed at a top of the casing 100, the compression assembly 300 may be disposed below the driver 200, and the driver 200 may be disposed between the refrigerant discharger 121 and the compression assembly 300.

(23) Thus, when oil is stored on a bottom face of the casing 100, the oil may be supplied directly to the compression assembly 300 without passing through the driver 200. In addition, since the rotatable shaft 230 is coupled to and supported by the compression assembly 300, a lower frame for supporting the rotatable shaft may be omitted.

(24) In one example, the lower scroll compressor 10 according to one embodiment of the present disclosure may be configured such that the rotatable shaft 230 penetrates not only the orbiting scroll 330 but also the fixed scroll 320 and is in face contact with both the orbiting scroll 330 and the fixed scroll 320.

(25) As a result, an inflow force generated when the fluid such as the refrigerant is flowed into the compression assembly 300, a gas force generated when the refrigerant is compressed in the compression assembly 300, and a reaction force for supporting the same may be exerted on the rotatable shaft 230 at the same time. Accordingly, the inflow force, the gas force, and the reaction force may be concentrated on the rotatable shaft 230. As a result, since an upsetting moment may not act on the orbiting scroll 320 coupled to the rotatable shaft 230, tilting or upsetting of the orbiting scroll may be prevented. In other words, various tilting including tilting in an axial direction as occurring at the orbiting scroll 320 may be attenuated or prevented. As a result, noise and tilting generated at the lower scroll compressor 10 may be prevented.

(26) In addition, in the lower scroll compressor 10 according to one embodiment of the present disclosure, a backpressure generated while the refrigerant is discharged to an outside of the compression assembly 300 is absorbed or supported by the rotatable shaft 230, so that a force (normal force) by which the orbiting scroll 330 and the fixed scroll 320 are in an excessively close contact state to each other in the axial direction may be reduced. As a result, a friction force between the orbiting scroll 330 and the fixed scroll 230 may be greatly reduced, such that durability of the compression assembly 300 may be improved.

(27) In one example, the main frame 310 may include a main end plate 311 disposed on one side of the driver 200 or below the driver 300, a main side plate 312 extending from an inner face of the main end plate 311 in a direction farther away from the driver 200 and seated on the fixed scroll 330, and a main shaft receiving portion 318 extending from the main end plate 311 to rotatably support the rotatable shaft 230.

(28) A main hole 317 for guiding the refrigerant discharged from the fixed scroll 320 to the refrigerant discharger 121 may be further defined in the main end plate 311 or the main side plate 312.

(29) The main end plate 311 may further include an oil pocket 314 that is engraved in an outer face of the main shaft receiving portion 318. The oil pocket 314 may be defined in an annular shape, and may be defined to be eccentric to the main shaft receiving portion 318. When the oil stored in the sealing shell 130 is transferred through the rotatable shaft 230 or the like, the oil pocket 314 may be defined such that the oil is supplied to a portion where the fixed scroll 320 and the orbiting scroll 330 are engaged with each other.

(30) The fixed scroll 320 may include a fixed end plate 321 coupled to the receiving shell 110 to form the other face of the compression assembly 300 while the main end plate 311 is disposed between the driver 300 and the fixed end plate 321, a fixed side plate 322 extending from the fixed end plate 321 toward the refrigerant discharger 121 and being in contact with the main side plate 312, and a fixed wrap 323 disposed on an inner circumferential face of the fixed side plate 322 to define the compression chamber in which the refrigerant is compressed.

(31) Further, the fixed scroll 320 may include a fixed through-hole 328 defined to penetrate the rotatable shaft 230, and a fixed shaft receiving portion 3281 extending from the fixed through-hole 328 such that the rotatable shaft is rotatably supported. The fixed shaft receiving portion 3331 may be disposed at a center of the fixed end plate 321.

(32) A thickness of the fixed end plate 321 may be equal to a thickness of the fixed shaft receiving portion 3381. In this case, the fixed shaft receiving portion 3281 may be inserted into the fixed through-hole 328 instead of protruding from the fixed end plate 321.

(33) The fixed side plate 322 may include an inflow hole 325 defined therein for flowing the refrigerant into the fixed wrap 323, and the fixed end plate 321 may include discharge hole 326 defined therein through which the refrigerant is discharged. The discharge hole 326 may be defined in a center direction of the fixed wrap 323, or may be spaced apart from the fixed shaft receiving portion 3281 to avoid interference with the fixed shaft receiving portion 3281, or the discharge hole 326 may include a plurality of discharge holes.

(34) The orbiting scroll 330 may include an orbiting end plate 331 disposed between the main frame 310 and the fixed scroll 320, and an orbiting wrap 333 disposed beneath the orbiting end plate to define the compression chamber together with the fixed wrap 323.

(35) The orbiting scroll 330 may further include an orbiting through-hole 338 passing through the orbiting end plate 33. The rotatable shaft 230 is rotatably received in the orbiting through-hole 338.

(36) In one example, the rotatable shaft 230 may be configured such that a portion thereof coupled to the orbiting through-hole 338 is eccentric. Thus, when the rotatable shaft 230 is rotated, the orbiting scroll 330 orbits in a state of being engaged with the fixed wrap 323 of the fixed scroll 320 to compress the refrigerant.

(37) Specifically, the rotatable shaft 230 may include a main shaft 231 coupled to the driver 200 and rotating, and a bearing portion 232 connected to the main shaft 231 and rotatably coupled to the compression assembly 300. The bearing portion 232 may be included as a member separate from the main shaft 231, and may accommodate the main shaft 231 therein, or may be integrated with the main shaft 231.

(38) The bearing portion 232 may include a main bearing portion 232a inserted into the main shaft receiving portion 318 of the main frame 310 and radially supported thereon, a fixed bearing portion 232a inserted into the fixed shaft receiving portion 3281 of the fixed scroll 320 and radially supported thereon, and an eccentric shaft 232b disposed between the main bearing portion 232a and the fixed bearing portion 232a, and inserted into the orbiting through-hole 338 of the orbiting scroll 330.

(39) In this connection, the main bearing portion 232a and the fixed bearing portion 232a may be coaxial to have the same axis center, and the eccentric shaft 232b may be formed such that a center of gravity thereof is radially eccentric with respect to the main bearing portion 232a or the fixed bearing portion 232a. In addition, the eccentric shaft 232b may have an outer diameter greater than an outer diameter of the main bearing portion 232a or an outer diameter of the fixed bearing portion 232a. As such, the eccentric shaft 232b may provide a force to compress the refrigerant while orbiting the orbiting scroll 330 when the bearing portion 232 rotates, and the orbiting scroll 330 may be disposed to regularly orbit the fixed scroll 320 by the eccentric shaft 232b.

(40) However, in order to prevent the orbiting scroll 320 from spinning, the lower scroll compressor 10 according to one embodiment of the present disclosure may further include an Oldham's ring 340 coupled to an upper portion of the orbiting scroll 320. The Oldham's ring 340 may be disposed between the orbiting scroll 330 and the main frame 310 to be in contact with both the orbiting scroll 330 and the main frame 310. The Oldham's ring 340 may be configured to linearly move in four directions of front, rear, left, and right directions to prevent the spinning of the orbiting scroll 320.

(41) In one example, the rotatable shaft 230 may be disposed to completely pass through the fixed scroll 320 to protrude out of the compression assembly 300. As a result, the rotatable shaft 230 may be in direct contact with outside of the compression assembly 300 and the oil stored in the sealing shell 130. Thus, the rotatable shaft 230 may rotate to pull up the oil which in turn may be fed into the compression assembly 300.

(42) An oil supply channel 234 for supplying the oil to an outer circumferential face of the main bearing portion 232a, an outer circumferential face of the fixed bearing portion 232a, and an outer circumferential face of the eccentric shaft 232b may be defined in an outer circumferential face of or inside the rotatable shaft 230.

(43) In addition, a plurality of oil holes 234a, 234b, 234c, and 234d may be defined in the oil supply channel 234. Specifically, the oil hole may include a first oil hole 234a, a second oil hole 234b, a third oil hole 234c, and a fourth oil hole 234d. First, the first oil hole 234a may be defined to pass through the outer circumferential face of the main bearing portion 232a.

(44) The first oil hole 234a may be defined to penetrate into the outer circumferential face of the main bearing portion 232a in the oil supply channel 234. In addition, the first oil hole 234a may be defined to penetrate, for example, an upper portion of the outer circumferential face of the main bearing portion 232a. However, the present disclosure is not limited thereto. That is, the first oil hole 234a may be defined to penetrate a lower portion of the outer circumferential face of the main bearing portion 232a. For reference, unlike as shown in the drawing, the first oil hole 234a may include a plurality of holes. In addition, when the first oil hole 234a includes the plurality of holes, the plurality of holes may be defined only in the upper portion or only in the lower portion of the outer circumferential face of the main bearing portion 232a, or may be defined in both the upper and lower portions of the outer circumferential face of the main bearing portion 232a.

(45) In addition, the rotatable shaft 230 may include an oil feeder 233 disposed to pass through a muffler 500 to be described later to be in contact with the stored oil of the casing 100. The oil feeder 233 may include an extension shaft 233a passing through the muffler 500 and in contact with the oil, and a spiral groove 233b spirally defined in an outer circumferential face of the extension shaft 233a and in communication with the supply channel 234.

(46) Thus, when the rotatable shaft 230 is rotated, due to the spiral groove 233b, a viscosity of the oil, and a pressure difference between a high pressure region S1 and an intermediate pressure region V1 inside the compression assembly 300, the oil rises through the oil feeder 233 and the supply channel 234 and is discharged into the plurality of oil holes. The oil discharged through the plurality of oil holes 234a, 234b, 234c, and 234d not only maintains an airtight state by forming an oil film between the fixed scroll 320 and the orbiting scroll 330, but also absorbs frictional heat generated at friction portions between the components of the compression assembly 300 and discharge the heat.

(47) The oil guided along the rotatable shaft 230 and supplied through the first oil hole 234a may lubricate the main frame 310 and the rotatable shaft 230. In addition, the oil may be discharged through the second oil hole 234b and supplied to a top face of the orbiting scroll 330, and the oil supplied to the top face of the orbiting scroll 330 may be guided to the intermediate pressure region through the pocket groove 314. For reference, the oil discharged not only through the second oil hole 234b but also through the first oil hole 234a or the third oil hole 234d may be supplied to the pocket groove 314.

(48) In one example, the oil guided along the rotatable shaft 230 may be supplied to the Oldham's ring 340 installed between the orbiting scroll 330 and the main frame 310 and to the fixed side plate 322 of the fixed scroll 320. Thus, wear of the fixed side plate 322 of the fixed scroll 320 and the Oldham's ring 340 may be reduced. In addition, the oil supplied to the third oil hole 234c is supplied to the compression chamber to not only reduce wear due to friction between the orbiting scroll 330 and the fixed scroll 320, but also form the oil film and discharge the heat, thereby improving a compression efficiency.

(49) Although a centrifugal oil supply structure in which the lower scroll compressor 10 uses the rotation of the rotatable shaft 230 to supply the oil to the bearing has been described, the centrifugal oil supply structure is merely an example. Further, a differential pressure supply structure for supplying oil using a pressure difference inside the compression assembly 300 and a forced oil supply structure for supplying oil through a trochoid pump, and the like may also be applied.

(50) In one example, the compressed refrigerant is discharged to the discharge hole 326 along a space defined by the fixed wrap 323 and the orbiting wrap 333. The discharge hole 326 may be more advantageously disposed toward the refrigerant discharger 121. This is because the refrigerant discharged from the discharge hole 326 is most advantageously delivered to the refrigerant discharger 121 without a large change in a flow direction.

(51) However, because of the structural characteristics that the driver 200 should be disposed between the compression assembly 300 and the refrigerant discharger 121, and that the fixed scroll 320 should constitute an outermost portion of the compression assembly 300, the discharge hole 326 is defined to spray the refrigerant in a direction opposite to a direction toward the refrigerant discharger 121.

(52) In other words, the discharge hole 326 is defined to spray the refrigerant in a direction away from the refrigerant discharger 121 with respect to the fixed end plate 321. Therefore, when the refrigerant is sprayed into the discharge hole 326 as it is, the refrigerant may not be smoothly discharged to the refrigerant discharger 121, and when the oil is stored in the sealing shell 130, the refrigerant may collide with the oil and be cooled or mixed.

(53) In order to prevent this situation, the compressor 10 according to one embodiment of the present disclosure may further include a muffler 500 coupled to an outermost portion of the fixed scroll 320 and providing a space for guiding the refrigerant to the refrigerant discharger 121.

(54) The muffler 500 may be disposed to seal one face disposed in a direction farther away from the refrigerant discharger 121 of the fixed scroll 320 to guide the refrigerant discharged from the fixed scroll 320 to the refrigerant discharger 121.

(55) The muffler 500 may include a coupling body 520 coupled to the fixed scroll 320 and a receiving body 510 extending from the coupling body 520 to define sealed space therein. Thus, the refrigerant sprayed from the discharge hole 326 may be discharged to the refrigerant discharger 121 by switching the flow direction along the sealed space defined by the muffler 500.

(56) Further, since the fixed scroll 320 is coupled to the receiving shell 110, the refrigerant may be restricted from flowing to the refrigerant discharger 121 by being interrupted by the fixed scroll 320. Therefore, the fixed scroll 320 may further include a bypass hole 327 defined therein allowing the refrigerant penetrated the fixed end plate 321 to pass through the fixed scroll 320. The bypass hole 327 may be disposed to be in communication with the main hole 331a. Thus, the refrigerant may pass through the compression assembly 300, pass the driver 200, and be discharged to the refrigerant discharger 121.

(57) Further, as the refrigerant flows more inwardly from an outer circumferential face of the fixed wrap 323, the refrigerant is compressed to have a higher pressure. Thus, an interior of the fixed wrap 323 and an interior of the orbiting wrap 333 is maintained in a high pressure state. Accordingly, a discharge pressure is exerted to a rear face of the orbiting scroll as it is. Thus, in a reaction manner thereto, the backpressure is exerted from the orbiting scroll 330 toward the fixed scroll 320. The compressor 10 according to one embodiment of the present disclosure may further include a backpressure seal 350 that concentrates the backpressure on a portion where the orbiting scroll 320 and the rotatable shaft 230 are coupled to each other, thereby preventing leakage between the orbiting wrap 333 and the fixed wrap 323.

(58) The backpressure seal 350 is disposed in a ring shape to maintain an inner circumferential face thereof at a high pressure, and separate an outer circumferential face thereof at an intermediate pressure lower than the high pressure. Therefore, the backpressure is concentrated on the inner circumferential face of the backpressure seal 350, so that the orbiting scroll 330 is in close contact with the fixed scroll 320.

(59) In this connection, when considering that the discharge hole 326 is defined to be spaced apart from the rotatable shaft 230, the backpressure seal 350 may be configured such that a center thereof is biased toward the discharge hole 326.

(60) In one example, the oil supplied to the compression assembly 300, or the oil stored in the oil storage space P of the casing 100 may flow toward an upper portion of the casing 100 together with the refrigerant as the refrigerant is discharged to the refrigerant discharger 121. In this connection, because the oil is denser than the refrigerant, the oil may not be able to flow to the refrigerant discharger 121 by a centrifugal force generated by the rotor 220, and may be attached to inner walls of the discharge shell 110 and the receiving shell 120. The lower scroll compressor 10 according to one embodiment of the present disclosure may further include collection passages F respectively on outer circumferential faces of the driver 200 and the compression assembly 300 to collect the oil attached to an inner wall of the casing 100 to the oil storage space of the casing 100 or the sealing shell 130.

(61) The collection channel may include a driver collection channel 201 defined in an outer circumferential face of the driver 200, a compression assembly collection channel 301 defined in an outer circumferential face of the compression assembly 300, and a muffler collection channel 501 defined in an outer circumferential face of the muffler 500.

(62) The driver collection channel 201 may be defined by recessing a portion of an outer circumferential face of the stator 210 is recessed, and the compression assembly collection channel 301 may be defined by recessing a portion of an outer circumferential face of the fixed scroll 320. In addition, the muffler collection channel 501 may be defined by recessing a portion of the outer circumferential face of the muffler. The driver collection channel 201, the compression assembly collection channel 301, and the muffler collection channel 501 may be defined in communication with each other to allow the oil to pass therethrough.

(63) Further, because the rotatable shaft 230 has a center of gravity biased to one side due to the eccentric shaft 232b, during the rotation, an unbalanced eccentric moment occurs, causing an overall balance to be distorted. Accordingly, the lower scroll compressor 10 according to one embodiment of the present disclosure may further include a balancer 400 that may offset the eccentric moment that may occur due to the eccentric shaft 232b.

(64) Further, because the compression assembly 300 is fixed to the casing 100, the balancer 400 is preferably coupled to the rotatable shaft 230 itself or the rotor 220 disposed to rotate. Therefore, the balancer 400 may include a central balancer 420 disposed on a bottom of the rotor 220 or on a face facing the compression assembly 300 to offset or reduce an eccentric load of the eccentric shaft 232b, and an outer balancer 410 coupled to a top of the rotor 220 or the other face facing the refrigerant discharger 121 to offset an eccentric load or an eccentric moment of at least one of the eccentric shaft 232b and the central balancer 420.

(65) Because the central balancer 420 is disposed relatively close to the eccentric shaft 232b, the central balancer 420 may directly offset the eccentric load of the eccentric shaft 232b. Accordingly, the central balancer 420 is preferably disposed eccentrically in a direction opposite to the direction in which the eccentric shaft 232b is eccentric. As a result, even when the rotatable shaft 230 rotates at a low speed or a high speed, because a spacing away from the eccentric shaft 232b is close, the central balancer 420 may effectively offset an eccentric force or the eccentric load generated in the eccentric shaft 232b almost uniformly.

(66) The outer balancer 410 may be disposed eccentrically in a direction opposite to the direction in which the eccentric shaft 232b is eccentric. However, the outer balancer 410 may be eccentrically disposed in a direction corresponding to the eccentric shaft 232b to partially offset the eccentric load generated by the central balancer 420.

(67) As a result, the central balancer 420 and the outer balancer 410 may offset the eccentric moment generated by the eccentric shaft 232b to assist the rotatable shaft 230 to rotate stably.

(68) Further, referring to FIG. 1, a plurality of discharge holes 326 may be defined.

(69) Generally, in the scroll compressor, the fixed wrap 323 and the orbiting wrap 333 extend radially around the center of the fixed scroll 320 as in a logarithmic spiral or involute shape. Therefore, since the center of the fixed scroll 320 has the highest pressure, it is common to define a discharge hole 326 in the center thereof.

(70) However, in the lower scroll compressor 10 according to one embodiment of the present disclosure, since the rotatable shaft 230 passes through the fixed end plate 321 of the fixed scroll 320, the discharge hole 326 cannot be located in the center of the wrap. Therefore, the compressor 10 according to one embodiment of the present disclosure may include discharge holes 326a and 326b defined in the inner circumferential face and the outer circumferential face of the center of the orbiting wrap, respectively (See FIGS. 2A to 2C).

(71) Furthermore, during low-load operation such as partial load, overcompression of the refrigerant may occur in the space having the discharge hole 326, thereby reducing efficiency. Therefore, unlike shown in the drawing, a plurality of discharge holes may be further defined in and along the inner circumferential face or the outer circumferential face of the orbiting wrap (Multi-step discharge scheme).

(72) Hereinafter, with reference to FIGS. 2A to 2C, an operating aspect of the lower scroll compressor 10 according to one embodiment of the present disclosure will be described.

(73) FIG. 2A illustrates the orbiting scroll, FIG. 2B illustrates the fixed scroll, and FIG. 2C illustrates a process in which the orbiting scroll and the fixed scroll type compress the refrigerant.

(74) The orbiting scroll 330 may include the orbiting wrap 333 on one face of the orbiting end plate 331, and the fixed scroll 320 may include the fixed wrap 323 on one face of the fixed end plate 321 facing toward the orbiting scroll 330.

(75) In addition, the orbiting scroll 330 is embodied as a sealed rigid body to prevent the refrigerant from being discharged to the outside. However, the fixed scroll 320 may include the inflow hole 325 in communication with a refrigerant supply pipe such that the refrigerant at a low temperature and a low pressure may inflow, and the discharge hole 326 through which the refrigerant of a high temperature and a high pressure is discharged. Further, a bypass hole 327 through which the refrigerant discharged from the discharge hole 326 is discharged may be defined in an outer circumferential face of the fixed scroll 320.

(76) The fixed wrap 323 and the orbiting wrap 333 may be configured to extend radially from an outer face of the fixed shaft receiving portion 3281. Therefore, a radius of each of the fixed wrap 323 and the orbiting wrap 333 according to one embodiment of the present disclosure may be relatively larger than that in the conventional scroll compressor. As a result, when the fixed wrap 323 and the orbiting wrap 333 are conventionally embodied in a logarithmic spiral or involute shape, a curvature decreases and thus a compression ratio decreases. Further, a strength of each of the fixed wrap 323 and the orbiting wrap 333 is weakened such that there is a risk of deformation.

(77) Accordingly, in the compressor 10 according to one embodiment of the present disclosure, the fixed wrap 323 and the orbiting wrap 333 may have a shape of a combination of a plurality of arcs whose curvatures continuously vary. For example, each of the fixed wrap 323 and the orbiting wrap 333 may be embodied as a hybrid wrap having a shape of a combination of at least 20 arcs whose curvatures continuously vary.

(78) Further, in the lower scroll compressor 10 according to one embodiment of the present disclosure, the rotatable shaft 230 is configured to penetrate the fixed scroll 320 and the orbiting scroll 330, such that a radius of curvature and a compression space of each of the fixed wrap 323 and orbiting wrap 333 are reduced.

(79) Therefore, in order to compensate for this reduction, the compressor 10 according to one embodiment of the present disclosure, the radius of curvature of each of the fixed wrap 323 and the orbiting wrap 333 at a portion thereof immediately before a discharge point may be smaller than that of the shaft receiving portion of the rotatable shaft such that the space to which the refrigerant is discharged may be reduced and a compression ratio may be improved. That is, each of the fixed wrap 323 and the orbiting wrap 333 may be configured to have the radius of curvature varying based on a position such that the radius of curvature thereof at the vicinity of the discharge hole 326 is the smallest and then the radius of curvature thereof gradually increases toward the inflow hole 325.

(80) Referring to FIG. 2C, refrigerant I is flowed into the inflow hole 325 of the fixed scroll 320, and refrigerant II flowed before the refrigerant I flows is located near the discharge hole 326 of the fixed scroll 320.

(81) In this connection, the refrigerant I is present in a region on outer circumferential faces of the fixed wrap 323 and the orbiting wrap 333 where the fixed wrap 323 and the orbiting wrap 333 are engaged with each other, and the refrigerant II is present in a sealed manner in another region in which the fixed wrap 323 and the orbiting wrap 333 are engaged with each other at two contact points.

(82) Thereafter, when the orbiting scroll 330 starts to orbit, as the region in which the fixed wrap 323 and the orbiting wrap 333 are engaged with each other at two contact points is displaced along an extension direction of the orbiting wrap 333 and the orbiting wrap 333, such that a volume of the region begins to be reduced. Thus, the refrigerant I starts to flow and be compressed. The refrigerant II starts to be further reduced in volume, be compressed, and guided to the discharge hole 326.

(83) The refrigerant II is discharged from the discharge hole 326. As the region in which the fixed wrap 323 and the orbiting wrap 333 are engaged with each other at two contact points is displaced in a clockwise direction, the refrigerant I flows, and the volume of the refrigerant I starts to decrease such that refrigerant I is further compressed.

(84) As the region in which the fixed wrap 323 and the orbiting wrap 333 are engaged with each other at two contact points is displaced again in the clockwise direction and thus is closer to an interior of the fixed scroll, the volume of the refrigerant I further decreases and the discharge of the refrigerant II is substantially completed.

(85) As such, as the orbiting scroll 330 orbits, the refrigerant may be compressed linearly or continuously while flowing into the fixed scroll.

(86) Although the drawing shows that the refrigerant flows into the inflow hole 325 discontinuously, this is intended only for illustrative purpose. Alternatively, the refrigerant may be supplied thereto continuously. Further, the refrigerant may be accommodated and compressed in each of regions where the fixed wrap 323 and the orbiting wrap 333 are engaged with each other at two contact points.

(87) As described above, the Oldham's ring 340 prevents spinning of the orbiting scroll 330. More specifically, when the rotatable shaft 230 rotates, the orbiting scroll 330 rotates. Thus, the Oldham's ring 340 may change the rotation of the orbiting scroll 330 into four directions (front, rear, left and right) to prevent spinning of the orbiting scroll 330. Therefore, the impact force or stress generated in the process of changing the rotation of the orbiting scroll 330 into the four directions acts on the Oldham's ring 340.

(88) FIG. 3 is a diagram showing a portion of the Oldham's ring on which the impact force is concentrated.

(89) Hereinafter, with reference to FIG. 3, a region of the Oldham's ring 340 where the impact force or stress generated in the Oldham's ring 340 is concentrated will be described.

(90) The Oldham's ring 340 includes a ring body 341 disposed between the orbiting scroll 330 and the main frame 310, and a plurality of keys 343 protruding from the ring body 341 and coupled to the orbiting scroll 330 and the main frame 310.

(91) That is, the key 343 includes main keys 343a coupled to the main frame 310 and orbiting keys 343b coupled to the orbiting scroll 330. Each main key 343a may protrude from the ring body 341 in a direction away from the orbiting scroll 330. Each orbiting key 343b may protrude from the ring body 341 in a direction away from the main frame 310.

(92) A stress concentrated position C may be disposed between each key 343 and the ring body 341. Further, the stress generated in the stress concentrated position C may be caused due to transmission thereto of an impact force generated between a key groove as described later and the key 343.

(93) Therefore, in order to reduce the stress generated in the stress concentrated position C, it is necessary to reduce the impact force generated between the key 343 and the key groove which will be described later.

(94) In one embodiment of the present disclosure, a deformable groove 600 may be defined in order to reduce the impact force occurring between the key 343 and the key groove to be described later.

(95) FIG. 4 is a diagram showing a deformable groove according to one embodiment of the present disclosure.

(96) Hereinafter, referring to FIG. 4, a general shape and a location of the deformable groove 600 will be described.

(97) The deformable groove 600 may include a main deformable groove 610 formed in the main frame 310 and an orbiting deformable groove 620 formed in the orbiting scroll 330.

(98) The main frame 310 and the orbiting scroll 330 may respectively include a plurality of key grooves 315 and 335 recessed toward the rotatable shaft 230 so that each key 343 may be inserted into each key groove. That is, the key grooves may include a main key groove 315 which is recessed in the main frame 310 in a direction away from the orbiting scroll 330, and an orbiting key groove 335 recessed in the orbiting scroll 330 in a direction away from the main frame 310.

(99) The main key groove 315 may include a first main key groove 315a and a second main key groove 315b symmetrically arranged with respect to the main shaft receiving portion 318. In other words, the second main key groove 315b may be located at an extension of an axis line extending between a center of the first main key groove 315a and the main shaft receiving portion 318.

(100) The main deformable groove 610 is formed to extend parallel to the main key groove 315, and may be formed to be depressed in the main frame 310. That is, the main deformable groove 610 may be recessed in one face of the main frame facing toward the driver 200 and in a direction away from the driver 200 and may extend parallel to the main key groove 315.

(101) Further, the main deformable groove 610 may have a length h1 in a direction parallel to a length direction of the main key groove 315, and a width w1 in a direction perpendicular to a length direction of the main key groove 315.

(102) As will be described later in FIGS. 5A to 5C, the smaller the width w1 is, the smaller the impact force generated between the key groove 315 and the key 343 may be. Thus, the width w1 is preferably smaller than the length h1.

(103) The above description is about the main key groove 315 and the main deformable groove 610 formed in the main frame 310, but may be equally applied to the orbiting scroll 330.

(104) That is, the orbiting scroll 330 may include a plurality of orbiting key grooves 335a and 335b that are recessed in the orbiting scroll 330 and in a direction away from the main frame 310. Further, the orbiting deformable groove 620 may have a length h2 in a direction parallel to a length direction of the orbiting key groove 335, and a width w2 in a direction perpendicular to a length direction of the orbiting key groove 335. In addition, the length h2 of the orbiting deformable groove 620 is preferably larger than the width w2 thereof.

(105) Hereinafter, referring to FIGS. 5A to 5C, a principle of reducing the impact force generated in the Oldham's ring 340 using the deformable groove 600 and an impact-force dissipating member capable of further reducing the impact force will be described.

(106) FIG. 5A is a diagram showing the compression assembly 300. FIG. 5B is an enlarged view of a portion where the Oldham's ring 340 and the orbiting scroll 330 contact each other to describe the deformable groove 600. FIG. 5C is an enlarged view of a portion where the Oldham's ring 340 and the orbiting scroll 330 contact each other to describe the impact-force dissipating member 630.

(107) Referring to FIG. 5B, the orbiting deformable groove 620 may be deformed based on behavior of the Oldham's ring 340.

(108) When the rotatable shaft 230 rotates, the orbiting scroll 330 coupled to the rotatable shaft 230 rotates. The orbiting scroll 330 may be prevented from spinning while contacting the Oldham's ring 340. More specifically, the orbiting key 343b may contact a sidewall of the orbiting key groove 335 such that the orbiting key 343b is prevented from escaping from the orbiting key groove 335.

(109) Therefore, a partition wall 337 located between the orbiting key groove 335 and the orbiting deformable groove 620 will be deformed due to a force by which the orbiting key 343b escapes from the orbiting key groove 335 while the orbiting key 343b contacts the sidewall of the orbiting key groove 335. That is, the partition wall 337 may be deformed in the same direction as a direction D1 in which the orbiting key 343b moves inside the orbiting key groove 335.

(110) In this case, as the partition wall 337 is deformed, the impact force generated between the orbiting key groove 335 and the orbiting key 343b may be reduced. In other words, when the orbiting key 343b applies an impact force to the orbiting key groove 335 in a circumferential direction thereof, the partition wall 337 may be deformed as much as the impact force is transmitted thereto.

(111) As described above, as the partition wall 337 is deformed, the impact force generated between the orbiting key groove 335 and the orbiting key 343b may be reduced. Therefore, it is preferable that the partition wall 337 is configured to be easily deformed.

(112) Referring to FIG. 5C, it is preferable that a depression S2 of the orbiting deformable groove 620 is greater than a depression S1 of the orbiting key groove 335. More specifically, the orbiting key groove 335 may be recessed in a direction away from the ring body 341 or in an axial direction to define a predefined depth S1. Further, the orbiting deformable groove 620 may be depressed in a direction away from the ring body 341 or in an axial direction to define a predefined depth S2.

(113) In this connection, when the depth S2 of the orbiting deformable groove 620 is larger than the depth S1 of the orbiting key groove 335, the partition wall 337 may be more easily deformed. This is because, in order for the impact force generated between the orbiting key groove 335 and the orbiting key 343b to be transferred to the partition wall 337 to cause the partition wall 337 to be deformed, the orbiting deformable groove 620 which helps the partition wall 337 deform must have the sufficient depth S2.

(114) If the depth S2 of the orbiting deformable groove 620 is smaller than the depth S1 of the orbiting key groove 335, the impact force generated between the orbiting key groove 335 and the orbiting key 343b is converted to a stress in a region of the orbiting end plate 311 located under the orbiting deformable groove 620, thereby to prevent the partition wall 337 to be deformed.

(115) In another example, in order to secure reliability of the orbiting end plate 331 even when the partition wall 337 is deformed, the orbiting deformable groove 620 may preferably extend to be spaced apart from a side face of the orbiting end plate 331.

(116) More specifically, referring to FIG. 5A, the orbiting end plate 331 may include one face 331a facing the main frame 310, an opposite face 331b spaced apart from one face 331a and seated on the fixed scroll 320, and an outer side face 331c extending between one face 331a and the opposite face 331b.

(117) The orbiting deformable groove 620 may be recessed in one face 331a toward the opposite face 331b and may have a width in a direction toward the outer side face 331c, and may be spaced apart from the outer side face 331c to promote the reliability of the orbiting end plate 331.

(118) Further, when taking into account that the partition wall 337 has an elastic deformation limit, the impact-force dissipating member 630 that is deformed according to the deformation of the orbiting deformable groove 620 and the partition wall 337 may be located in the orbiting deformable groove 620.

(119) A width of the impact-force dissipating member 630 may be equal to or larger than the width w2 of the orbiting deformable groove 620 and may be press-fitted to the orbiting deformable groove 620 and may be made of a material that absorbs the impact force and tilting inside the orbiting deformable groove 620. For example, the impact-force dissipating member 630 may be made of a polymer material, and may be made of rubber.

(120) Therefore, even when the partition wall 337 is deformed within the limit of elastic deformation, the impact-force dissipating member 630 is deformed in the same direction as the deformation direction of the partition wall 337, thereby further reducing the impact force.

(121) The above description is only about the orbiting deformable groove 620 formed in the orbiting scroll 330, and may be equally applied to the main deformable groove 610 formed in the main frame 310.

(122) That is, the main end plate 311 may include one face 311a in contact with the ring body 341, an opposite face 311b spaced from one face 311a in a direction away from the ring body 341, and an outer side face 311c extending between one face 311a and the opposite face 311b.

(123) The main deformable groove 610 which is depressed in one face 311a toward the opposite face 311b, and has a width in a direction toward the outer side face 311c may be spaced apart from the outer side face 311c. A depression of the main deformable groove 610 toward the opposite face 311b may be greater than a depression of the main key groove 315 toward the opposite face 311b.

(124) Further, in the main end plate 311, the partition wall 317 may be formed, which is located between the main key groove 315 and the main deformable groove 610 and deforms due to the impact force. The impact-force dissipating member 630 is located inside the main deformable groove 610, so that the impact force may be more efficiently reduced.

(125) In this way, when the main deformable groove 610 and the orbiting deformable groove 620 are defined, the impact force generated in the Oldham's ring 340 may be effectively reduced although a separate component is not installed in order to reduce the impact force generated in the Oldham's ring 340.

(126) Further, even when the partition walls 317 and 337 deform within the elastic deformation limit, the impact-force dissipating members 630 other than the partition walls 317 and 337 may reduce the impact force by a larger amount by which the impact force may be reduced when using only the partition walls 317 and 337.

(127) Further, the stress generated in the ring body 341 is reduced, so that the reliability of the Oldham's ring 340 may be improved, and the tilting and noise generated in an entirety of the compressor 10 may be reduced.

(128) Hereinafter, various shapes of the deformable groove 600 according to one embodiment of the present disclosure will be described with reference to FIGS. 6A to 6C.

(129) Referring to FIG. 6A, the orbiting deformable groove 620 may include a pair of orbiting deformable grooves 621a and 621b on both sides of the orbiting key groove 335 interposed therebetween.

(130) More specifically, the orbiting key groove 335 may include a first orbiting key groove 335a and a second orbiting key groove 335b while the orbiting shaft receiving portion 338 is interposed therebetween.

(131) The first orbiting key groove 335a may include a first face 3351a having a planar shape, a second face 3353a spaced apart from the first face 3351a and parallel to the first face 3351a, and a connection face as a curved face extending between the first face 3315a and the second face 3351a.

(132) The first orbiting deformable groove 621a may be spaced apart from the first face 3351a and extend parallel to a length direction of the first orbiting key groove 335a and may have a width in a direction away from the second face 3353a. The second orbiting deformable groove 621b may be spaced apart from the second face 3353a and extend parallel to a length direction of the first orbiting key groove 335a and may have a width in a direction away from the first face 3351a.

(133) That is, the first orbiting key groove 335a may be defined between the first orbiting deformable groove 621a and the second orbiting deformable groove 621b. The first orbiting deformable groove 621a and the second orbiting deformable groove 621b may extend in parallel with each other.

(134) Further, the second orbiting key groove 335b may include a first face 3351b, a second face 3353b, and a connection face in the same manner as in the first orbiting key groove 335a. A third orbiting deformable groove 623a and a fourth orbiting deformable groove 623b may be defined in the orbiting end plate 331 and may be spaced apart from the second orbiting key groove 335b while the second orbiting key groove 335b is interposed therebetween.

(135) Further, in the same way in which the plurality of the orbiting deformable groove 621a, 621b, 623a, and 623b are defined in the orbiting end plate 331, a plurality of the main deformable grooves 611a, 611b, 613a, and 613b may be defined in the main end plate 311.

(136) That is, the first main key groove 315a may be defined between the first main deformable groove 611a and the second main deformable groove 611b extending in parallel with each other.

(137) The second main key groove 315b may be defined between the third main deformable groove 613a and the fourth main deformable groove 63b extending parallel to each other.

(138) Further, each of the first main key groove 315a and the second main key groove 315b may have a first face 3151 having a planar shape, a second face 3153 spaced apart from the first face 3151 and extending in parallel to the first face 3151, and a connection face as a curved face extending between the first face 3151 and the second face 3153.

(139) Therefore, when considering that the impact force is not generated only on one side of each of the key grooves 315 and 335 as the rotatable shaft 230 rotates, the deformable groove 600 may be defined on each of both sides of each of the key grooves 315 and 335, so that the impact force generated on both sides of each of the key grooves 315 and 335 may be reduced.

(140) Referring to FIG. 6B, the first orbiting deformable groove to the fourth orbiting deformable groove 621a, 621b, 623a, and 623b may have curved faces 6211 and 6231 that allow the partition wall 337 to be easily deformed.

(141) More specifically, each of the curved faces 6211 and 6231 may define at least one of both length-directional ends of each of the orbiting deformable grooves 620. That is, each of the curved faces 6211 and 6231 may define one length-directional end of each of the first orbiting deformable groove to the fourth orbiting deformable groove 621a, 621b, 623a, and 623b closer to the outer side face 331c of the orbiting end plate 311. Alternatively, each of the curved faces 6211 and 6231 may define one length-directional end of each of the first orbiting deformable groove to the fourth orbiting deformable groove 621a, 621b, 623a, and 623b far away from the outer side face 331c of the orbiting end plate 311.

(142) The above description is about the curved faces 6211 and 6231 formed in the orbiting end plate 331, but may be equally applied to the main end plate 311.

(143) That is, each of the curved faces 6111 and 6131 may define at least one of both end portions in an extension direction of each of the first main deformable groove to the fourth main deformable groove 611a, 611b, 613a, and 613b.

(144) In this case, the curved faces 6111, 6131, 6211, and 6231 may play a role of allowing easy deformation of the partition walls 317 and 337 due to the impact force transmitted to the partition walls 317 and 337. That is, the curved faces 6111, 6131, 6211, and 6231 may apply a stronger elastic restoring force to the deformable groove 600, so that even though each of the partition walls 317 and 337 is deformed in the same amount, the impact force may be reduced by a larger amount.

(145) Referring to FIG. 6C, each of the first orbiting deformable groove 621a and the second orbiting deformable groove 621b may have an extension 6213 extending toward the outer side face 331c of the orbiting end plate 311 and passing through the outer side face 331c.

(146) Unlike the foregoing configuration of FIG. 5C, when each of the first orbiting deformable groove 621a and the second orbiting deformable groove 621b further include the extension 6213 passing through the outer side face 331c, a component of the impact force acting at a position near the outer side face 331c of the orbiting end plate 331 among components of the impact force acting on the partition wall 337 may be more efficiently reduced. This is because the extension 6213 induces deformation of the partition wall 337 outwardly in the radial direction.

(147) Further, the aforementioned extension 6213 is defined in each of the first orbiting deformable groove 621a and the second orbiting deformable groove 621b. An extension 6233 as the same configuration as that of the aforementioned extension 6213 may be defined in each of the third orbiting deformable groove 623a and the third orbiting deformable groove 623b.

(148) When considering that the main end plate 311 is coupled to the inner circumferential face of the casing 100, it may be desirable that no extension is defined in the main end plate 311. This is because when the extension passes through the outer side face 331c of the main end plate 311, the extension may interfere with the oil collection flow F or may interfere with the refrigerant channel.

(149) As the rotatable shaft 230 rotates eccentrically, a contact point between each of the key grooves 315 and 335 and the key 343 may vary. That is, when the rotatable shaft 230 rotates eccentrically, the key 343 may be temporarily biased inside each of the key grooves 315 and 335 such that the key 343 and each of the key grooves 315 and 335 may be separated from each other.

(150) In this case, the impact force does not occur in a position in which each of the key grooves 315 and 335 is separated from the key 343, while the impact force may be concentrated on a position in which each of the key grooves 315 and 335 is in contact with the key 343.

(151) That is, each of the key grooves 315 and 335 may have each of contact points 3155 and 3355 on which the impact force is concentrated according to eccentric rotation of the rotatable shaft 230.

(152) Hereinafter, the contact points 3155 and 3355 of the key grooves 315 and 335 will be described with reference to FIG. 7

(153) The contact point may include a main contact point occurring between the main key groove 315 and the key 343.

(154) The main contact point may include a first main contact point 3155a and a second main contact point 3155b occurring on the first main key groove 315a.

(155) The first main contact point 3155a and the second main contact point 3155b may be arranged in a non-symmetrical to each other. That is, a spacing between the first main contact point 3155a and the outer side face 331c may be different from a spacing between the second main contact point 3155b and the outer side face 331c.

(156) Similarly, the main contact point may include a third main contact point 3155c and a fourth main contact point 3155d occurring on the second main key groove 315b.

(157) Further, the contact point may include an orbiting contact point occurring between the orbiting key groove 335 and the key 343. The orbiting contact point may include a first orbiting contact point 3355a and a second orbiting contact point 3355b occurring on the first orbiting key groove 335a.

(158) A spacing between the first orbiting contact point 3355a and the outer side face 331c may be different from a spacing between the second orbiting contact point 3355b and the outer side face 331c. In this connection, the spacing from the outer side face 331c may refer to a spacing in the extending direction of the deformable groove 600.

(159) Similarly, the orbiting contact point may include a third orbiting contact point 3355c and a fourth orbiting contact point 3355d occurring on the second orbiting key groove 335b.

(160) In this case, positions of the partition walls 317 and 337 at which the partition walls 317 and 337 are deformed may vary depending on positions of the contact points 3155 and 3355. That is, when the position on the deformable groove 600 corresponding to a position of each of the contact points 3155 and 3355 is located at a center of the length of the deformable groove 600, the impact force transmitted to each of the contact points 3155 and 3355 may deform each of the partition walls 317 and 337 by a larger amount. To the contrary, when the position of the deformable groove 600 corresponding to a position of each of the contact points 3155 and 3355 is located at a position deviated from the center of the deformable groove 600, the impact force transmitted to each of the contact points 3155 and 3355 may deform each of the partition walls 317 and 337 by a smaller amount.

(161) Therefore, the deformable groove 600 is preferably formed in consideration of the positions of the contact points 3155 and 3355.

(162) Hereinafter, the deformable groove 600 according to one embodiment of the present disclosure as defined while taking into account the positions of the contact points 3155 and 3355 will be described with reference to FIG. 8A to FIG. 9B

(163) FIGS. 8A and 8B are diagrams showing a positional correspondence between the impact-force dissipating member 630 and each of the contact points 3155 and 3355.

(164) Referring to FIG. 8A, four impact-force dissipating members 630 are located inside the first orbiting deformable groove to the fourth orbiting deformable groove 621a, 621b, 623a, and 623b and in a positionally corresponding manner to a first orbiting contact point to a fourth orbiting contact point 3355a, 3355b, 3355c, and 3355d, respectively, thereby to reduce the impact force.

(165) In an example, one impact-force dissipating member 630 may be disposed inside the first orbiting deformable groove 621a and at a position corresponding to that of the first orbiting contact point 3355a. Further, one impact-force dissipating member 630 may be disposed inside the second orbiting deformable groove 621b, and at a position corresponding to that of the second orbiting contact point 3355b.

(166) More specifically, the impact-force dissipating member 630 being disposed inside the orbiting deformable groove 620 and at a position corresponding to that of the orbiting contact point 3355 may mean that the impact-force dissipating member 630 faces away the orbiting contact point 3355 while the partition wall 337 is interposed therebetween.

(167) For example, the impact-force dissipating member 630 may be disposed at a point where a virtual line extending from the first orbiting contact point 3355a on the first face 3351 in a perpendicular manner to the first face 3351 meets the first orbiting deformable groove 621a.

(168) The configuration related to the position of the impact-force dissipating member 630 as described above may be equally applied to that of the impact-force dissipating member 630 located inside each of the third orbiting deformable groove 623a and the fourth orbiting deformable groove 623b.

(169) Referring to FIG. 8B, four impact-force dissipating members 630 are located inside the first main deformable groove to the fourth main deformable groove 611a, 611b, 613a, and 613b and in a positionally corresponding manner to the first main contact point to the fourth main contact point 3155a, 3155b, 3155c, and 3155d, respectively, thereby to reduce the impact force.

(170) As described above based on FIG. 8A, the four impact-force dissipating members 630 may be located inside the first main deformable groove to the fourth main deformable groove 611a, 611b, 613a, and 613b and in a positionally corresponding manner to the first main contact point to the fourth main contact point 3155a, 3155b, 3155c, and 3155d, respectively, thereby to reduce the impact force.

(171) The configuration related to the position of the impact-force dissipating member 630 is the same as that described above in FIG. 8A, and, thus, descriptions thereof are omitted.

(172) As a result, the impact-force dissipating members 630 may effectively reduce a component of the impact force concentrated on a position corresponding to that of each of the contact points 3155 and 3355 among components of the impact force transmitted to each of the partition walls 317 and 337.

(173) FIGS. 9A and 9B are views showing a state in which positions of two deformable grooves 600 sandwiching each of the key grooves 315 and 335 therebetween are modified.

(174) Referring to FIG. 9A, a spacing from a first orbiting deformable groove 621a to the outer side face 331c of the orbiting end plate 331 may be different from a spacing from the second orbiting deformable groove 621b to the outer side face 331c of the orbiting end plate 331.

(175) More specifically, the first orbiting deformable groove 621a may be closer to the first face 3351 than to the second face 3353 and extend one end 6215a to the other end 6217a in parallel with the first face 3351 or the second face 3353. Further, the second orbiting deformable groove 623b may be closer to the second face 3353 than to the first face 3351 and may extend from one end 6215a to the other end 6217b in parallel with the first face 3351 or the second face 3353.

(176) A spacing L1 between the other end 6217a of the first orbiting deformable groove 621a and the outer side face 331c of the orbiting end plate 331 may be different from a spacing L2 between the other end 6217b of the second orbiting deformable groove 621b and the outer side face 331c of the orbiting end plate 331. In this connection, the spacing from the outer side face 331c may refer to a spading therefrom in a parallel direction to the first face 3351 or the second face 3353.

(177) When a length of the first orbiting deformable groove 621a and a length of the second orbiting deformable groove 621b are equal to each other, the spacing L1 between the other end 6217a of the first orbiting deformable groove 621a and the outer side face 331c of the orbiting end plate 331 may be larger or smaller than the spacing L2 between the other end 6217b of the second orbiting deformable groove 621b and the outer side face 331c of the orbiting end plate 331.

(178) Similarly, a spacing between the third orbiting deformable groove 623a and the outer side face 331c may be different from a spacing between the fourth orbiting deformable groove 623b and the outer side face 331c.

(179) In this connection, when a length of the third orbiting deformable groove 623a and a length of the fourth orbiting deformable groove 623b are equal to each other, a spacing between the third orbiting deformable groove 623a and the outer side face 331c may be larger or smaller than a spacing between the fourth orbiting deformable groove 623b and the outer side face 331c.

(180) Referring to FIG. 9B, a spacing between the first main deformable groove 611a and the outer side face of the main end plate may be different from a spacing the second main deformable groove 611b and the outer side face of the main end plate.

(181) In the same manner as described in FIG. 9A, the first main deformable groove 611a may include one end 6135a and the other end 6137a. The second main deformable groove 611b may include one end 6135b and the other end 6137b. Further, a spacing L3 between the other end 6137a of the first main deformable groove 611a and the outer side face 311c may be different from a spacing L4 between the other end 6137b of the second main deformable groove 611b and the outer side face 311c.

(182) The arrangement of the first main deformable groove 611a and the second main deformable groove 611b are configured in the same manner as those described above in FIG. 9A. Further, the arrangement of the third main deformable groove 613a and the fourth main deformable groove 613b are configured in the same manner as those described above in FIG. 9A.

(183) Accordingly, a position of each of the contact points 3155 and 3355 may correspond to a center of the length of the deformable groove 600 or may correspond to a position close to the center of the length of the deformable groove 600. Therefore, a component of the impact force concentrated on one point of each of the key grooves 315 and 335 among components of the impact force generated in each of the key grooves 315 and 335 may be effectively reduced.

(184) Effects as not described herein may be derived from the above configurations. The relationship between the above-described components may allow a new effect not achieved in the conventional approach to be derived.

(185) In addition, embodiments shown in the drawings may be modified and implemented in other forms. The modifications should be regarded as falling within a scope of the present disclosure when the modifications is carried out so as to include a component claimed in the claims or within a scope of an equivalent thereto.