PISTON LIMITING STRUCTURE, COMPRESSOR, AND HEAT EXCHANGE APPARATUS

Abstract

Some embodiments of a disclosure provide a piston limiting structure, a compressor, and a heat exchange apparatus. The piston limiting structure includes: a cylinder, having a piston hole perpendicular to an axial direction of the cylinder and penetrating the cylinder, wherein a projection of the piston hole in a penetrating direction is circular; a piston, disposed in the piston hole and slid in the piston hole, wherein a side wall of the piston is provided with a limiting surface, and the limiting surface does not penetrate two ends of the side wall of the piston along an axial length of the piston; and a limiting member, wherein the cylinder is provided with a limiting hole penetrating from an outer wall of the cylinder to the piston hole, the limiting member is mounted in the limiting hole , and the limiting member abuts against the limiting surface.

Claims

1. A piston limiting structure, comprising: a cylinder, having a piston hole perpendicular to an axial direction of the cylinder and penetrating the cylinder, wherein a projection of the piston hole in a penetrating direction is circular; a piston, disposed in the piston hole in a form-fit manner and slid in the piston hole in a reciprocating manner, wherein a side wall of the piston is provided with a limiting surface, and the limiting surface does not penetrate through two ends of the side wall of the piston along an axial direction of the piston; and a limiting member, wherein the cylinder is provided with a limiting hole passing from an outer wall of the cylinder to the piston hole, the limiting member is mounted in the limiting hole in the form-fit manner, and the limiting member abuts against the limiting surface to limit a rotation of the piston around its own axis.

2. The piston limiting structure as claimed in claim 1, wherein, the limiting hole penetrates from an end face of the cylinder to the piston hole and is parallel to an axial direction of the cylinder.

3. The piston limiting structure as claimed in claim 2, wherein, a position of the limiting hole on the cylinder corresponds to a position of ½ of an axial length of the piston hole.

4. The piston limiting structure as claimed in claim 3, wherein, while the piston is reciprocated to be slid in the piston hole, it is satisfied:
L1−L2≥S wherein, the L1 is a length of the limiting surface along the axial direction of the piston, the L2 is a length of the limiting member along the axial direction of the piston, and the S is a stroke of the piston slid in the cylinder.

5. The piston limiting structure as claimed in claim 3, wherein, the limiting surface is a plane, wherein the limiting surface is disposed in a position of ½ of a radial height direction of the piston.

6. The piston limiting structure as claimed in claim 5, wherein, while the limiting member abuts against the limiting surface, it is satisfied: $\frac{D_1+D_2}{2}>L$ wherein, the D1 is a diameter of a projection of the piston in the axial direction, the D2 is a length of the limiting member in a radial direction of the piston, and the L is a length from a center of the limiting member in the radial direction of the piston to a center of the piston.

7. The piston limiting structure as claimed in claim 6, wherein, while the limiting member abuts against the limiting surface, it is satisfied: $L>\frac{D_1-D_2}{2}$ wherein, the D1 is the diameter of the projection of the piston along the axial direction, the D2 is the length of the limiting member in the radial direction of the piston, and the L is the length from the center of the limiting member in the radial direction of the piston to the center of the piston.

8. The piston limiting structure as claimed in claim 2, wherein, the limiting hole is extended to a position of ½ of an axial height of the cylinder from the end face of the cylinder.

9. The piston limiting structure as claimed in claim 8, wherein, the number of the limiting hole is one, and the limiting hole is disposed on an upper end face or a lower end face of the cylinder.

10. The piston limiting structure as claimed in claim 8, wherein, the number of the limiting holes is two, two limiting holes are disposed on an upper end face of the cylinder and positioned at two sides of an axis of the cylinder, or two limiting holes are disposed on a lower end face and positioned at two sides of an axis of the cylinder, or one of two limiting holes is disposed on an upper end face of the cylinder and positioned at one side of an axis of the cylinder, and the other of the two limiting holes is disposed on a lower end face of the cylinder and positioned at the other side of the axis of the cylinder.

11. The piston limiting structure as claimed in claim 7, wherein, the limiting hole penetrates through the cylinder, and is disposed in at least one side of two sides of the axis of the cylinder.

12. The piston limiting structure as claimed in claim 1, wherein the limiting member comprises a cylindrical limiting pin.

13. A compressor, comprising: a rotation shaft; the piston limiting structure as claimed in claim 1, wherein the cylinder and the piston are provided with shaft holes penetrating along an axial direction of the cylinder, the shaft holes are used for mounting the rotation shaft; and a cylinder sleeve, wherein the cylinder is disposed in the cylinder sleeve and driven to be rotated by the rotation shaft.

14. A heat exchange apparatus, comprising the piston limiting structure as claimed in claim 1.

15. The heat exchange apparatus as claimed in claim 14, wherein the heat exchange apparatus comprises an air conditioner.

16. The piston limiting structure as claimed in claim 4, wherein, the limiting surface is a plane, wherein the limiting surface is disposed in a position of ½ of a radial height direction of the piston.

17. The compressor as claimed in claim 13, wherein the limiting hole penetrates from an end face of the cylinder to the piston hole and is parallel to an axial direction of the cylinder.

18. The compressor as claimed in claim 17, wherein a position of the limiting hole on the cylinder corresponds to a position of ½ of an axial length of the piston hole.

19. The compressor as claimed in claim 18, wherein while the piston is reciprocated to be slid in the piston hole, it is satisfied:
L1−L2≥S wherein, the L1 is a length of the limiting surface along the axial direction of the piston, the L2 is a length of the limiting member along the axial direction of the piston, and the S is a stroke of the piston slid in the cylinder.

20. The compressor as claimed in claim 17, wherein the limiting surface is a plane, wherein the limiting surface is disposed in a position of ½ of a radial height direction of the piston.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly describe specific implementation modes of the disclosure or technical schemes in the art known to inventors, drawings to be used in descriptions of the specific implementation modes or the art known to inventors are briefly introduced below. Apparently, the drawings in the following descriptions are some of the implementation modes of the disclosure, and other drawings may also be obtained by those of ordinary skill in the art without creative work according to these drawings.

[0042] FIG. 1 is an exploded schematic diagram of a compressor in some embodiments provided by the disclosure.

[0043] FIG. 2 is an assembly structure section view of the compressor in some embodiments provided by the disclosure.

[0044] FIG. 3 is a schematic structure diagram of a cylinder in some embodiments provided by the disclosure.

[0045] FIG. 4A and FIG. 4B are schematic structure diagrams of a piston in some embodiments provided by the disclosure.

[0046] FIG. 5A and FIG. 5B are a top view and a sectional view of a cylinder in some embodiments provided by the disclosure.

[0047] FIG. 6 is a sectional view of a limiting member and a piston assembly in one embodiment provided by the disclosure.

[0048] FIG. 7 is a sectional view of a limiting member and a piston assembly in a second embodiment provided by the disclosure.

[0049] FIG. 8 is a sectional view of a limiting member and a piston assembly in a third embodiment provided by the disclosure.

[0050] FIG. 9 is a sectional view of a limiting member and a piston assembly in a fourth embodiment provided by the disclosure.

[0051] FIG. 10 is a sectional view of a limiting member and a piston assembly in a fifth embodiment provided by the disclosure.

[0052] FIG. 11 is a sectional view of a limiting member and a piston assembly in a sixth embodiment provided by the disclosure.

[0053] FIG. 12 is a sectional view of a limiting member and a piston assembly in a seventh embodiment provided by the disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0054] Technical schemes of the disclosure are clearly and completely described below in combination with drawings. Apparently, described embodiments are a part of the embodiments of the disclosure, not all of the embodiments. Based on the embodiments in the disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within a scope of protection of the disclosure. In addition, technical features involved in the different embodiments of the disclosure described below may be combined with each other as long as there is no conflict between them.

[0055] A rotary cylinder piston compressor in an art known to inventors includes a flange, a cylinder sleeve, a cylinder, a piston and a rotation shaft, based on a crosshead shoe principle, the piston is reciprocated to be slid relative to the cylinder during a rotation process, thereby two ends of the piston form a compression chamber and an exhaust chamber with the cylinder and the cylinder sleeve, respectively. For the piston of the rotary cylinder piston compressor, a degree of freedom of auto-rotation of the piston around an axis of the piston itself needs to be limited. The piston limiting structure provided by some embodiments of the disclosure is used for the rotary cylinder piston compressor in the art known to inventors, thereby it is achieved that the piston is limited. FIG. 1 to FIG. 6 show some embodiments of the piston limiting structure of the disclosure.

[0056] The piston limiting structure provided by some embodiments of the disclosure includes a cylinder 1, a piston 2 and a limiting member 3. As shown in FIG. 1 to FIG. 6, in some embodiments, the cylinder 1 is a cylindrical cylinder, an axial direction of the cylinder 1 is provided with an assembling hole 12 penetrating through the cylinder 1, and the assembling hole 12 is configured for a rotation shaft 6 to pass through. A peripheral surface of the cylinder 1 is provided with a piston hole 11 perpendicular to a direction of the assembling 12 and penetrating the cylinder 1, and a projection of the piston hole 11 along an axial direction itself is circular.

[0057] As shown in FIG. 4A and FIG. 4B, the piston 2 is disposed in the piston hole 11 in a form-fit manner and is reciprocated to be slid in the piston hole 11. The piston 2 is cooperated with the piston hole 11, the piston 2 is a structure similar to a cylinder, end faces at two ends of the piston 2 are curved surface structures which are cooperated with the piston hole 11 to form a completed cylindrical surface, an axial length of the piston 2 is less than a radial size of the cylinder 1, and the piston 2 is reciprocated to be slid in the cylinder 1. A middle portion of the piston 2 is provided with a shaft hole 22 along an axial direction of the cylinder 1, while the piston 2 is mounted in the piston hole 11, the rotation shaft 6 passes through the assembling hole 12 of the cylinder 1 and the shaft hole 22 on the piston 2. A side wall of the piston 2 is provided with a limiting surface 21, and the limiting surface 21 does not penetrate two ends of the side wall of the piston 2 along an axial length of the piston 2. As shown in FIG. 4A and FIG. 4B, in some embodiments, the limiting surface 21 is set as a limiting plane, it is convenient for machining and forming, at the same time, the limiting surface 21 is disposed on a position of ½ of a radial height direction of the piston 2.

[0058] The cylinder 1 is provided with a limiting hole 13 penetrating from an outer wall of the cylinder 1 to the piston hole 11, the limiting member 3 is mounted in the limiting hole 13 in a form-fit manner, the limiting member 3 abuts against the limiting surface 21 to limit the auto-rotation of the piston 2. As shown in FIG. 3, in some embodiments, the limiting hole 13 penetrates from an end face of the cylinder 1 to the piston hole 11 and is parallel to an axial direction of the cylinder 1, the limiting hole 13 is arranged in a vertical direction of the cylinder 1, so that the limiting member 3 abuts against the limiting surface 21 in the vertical direction, machining and forming of the limiting hole 13 are convenient, and an abutting direction is perpendicular to a rotation direction of the cylinder 1 and the piston 2, the limiting member 3 is not subjected to a rotation torque in a horizontal direction, the limiting structure is more stable and reliable. At the same time, in some embodiment, for convenient machining and forming and accuracy guarantee of the limiting member 3, the limiting hole 13 is set as a circular hole, correspondingly the limiting member 3 is set as a cylindrical pin structure, a circular pin is cooperated with the limiting hole 13, for example, a fit clearance between two parties is set as 0-0.05 mm. A position of the limiting hole 13 on the cylinder 1 corresponds to a position of ½ of an axial direction of the piston hole 11, namely the limiting hole 13 is mounted in a middle position of the piston hole 11 along a length direction.

[0059] As shown in FIG. 6, while the piston 2, the cylinder 1 and the limiting member 3 are assembled, the piston 2 is assembled in the piston hole 11, the limiting member 3 is inserted in the limiting hole 13 of the cylinder 1, at this moment, the limiting member 3 abuts against the limiting surface 21 of the piston 2, thereby the piston 2 is reciprocated to be slid in the piston hole 11, but the piston 2 is limited to be auto-rotated.

[0060] In some embodiments, under a working state, the piston 2 is reciprocated relative to the limiting member 3, thereby in order to guarantee that the piston 2 may not collide with the limiting member 3 during a process of a reciprocating motion, while the piston 2 is reciprocated to be slid in the piston hole 11, it is satisfied:

L1−L2≥S

[0061] Herein, as shown in FIG. 4A, FIG. 4B, FIG. 5A and FIG. 5B, the L1 is a length of the limiting surface 21 along an axial direction of the piston 2, and the L2 is a length of the limiting member 3 along the axial direction of the piston 2, in some embodiments, the L2 is a diameter of a cross section of the limiting member 3, and the S is a stroke of the piston slid in the cylinder.

[0062] While L1−L2=S, and the piston 2 is slid to a destination position of the stroke in the piston hole 11, a side wall of a sink groove formed by the limiting surface 21 on the piston 2 and the limiting member 3 are positioned in a limit position in which they just do not contact with each other, at this moment, the piston 2 does not collide with the limiting member 3. While L1−L2>S, and the piston 2 is reciprocated to be slid in the piston hole 11, the side wall of the sink groove formed by the limiting surface 21 on the piston 2 always does not contact with the limiting member 3, therefore the piston 2 does not collide with the limiting member 3, and the compressor is worked more stably and reliably.

[0063] On this basis, it can be seen that the length L2 of the limiting member 3 along the axial direction of the piston 2 is longer, correspondingly the length L1 of the limiting surface 21 is also designed to be longer, therefore the length of the limiting surface 21 is reduced by reducing the length of the limiting member 3 along the axial direction of the piston 2, the length of the limiting surface 21 is reduced, correspondingly a sealing distance between the piston 2 and the inner wall of the cylinder 1 becomes longer, so that a sealing effect between the piston 2 and the inner wall of the cylinder is better. At the same time, under a precondition of satisfying a minimum sealing distance requirement, diameters of the piston 2 and the cylinder 1 are correspondingly designed to be reduced, therefore the mechanical power consumption of the compressor is reduced.

[0064] In some embodiments, in order to guarantee that an abutting relation exists between the limiting member 3 and the limiting surface 21 of the piston 2, it is satisfied by the setting of the limiting hole 13 that:

[00006]$\frac{D_1+D_2}{2}>L$

[0065] Herein, as shown in FIG. 5A and FIG. 5B, the D1 is a diameter of a cross section of the piston 2, and the D2 is a length of the limiting member 3 in a radial direction of the piston 2, in some embodiments, D2 is a diameter of a section of the limiting member 3, and the L is a length from a center of the limiting member 3 in the radial direction of the piston 2 to a center of the piston 2, while the limiting member 3 abuts against the limiting surface 21, L=(D1+D2)/2−B, herein the B is a depth of the sink groove formed by the limiting surface 21 on the piston 2.

[0066] While

[00007]$\frac{D_1+D_2}{2}=L,$

the limiting member 3 and the piston 2 are positioned in a critical state of non-contact, at this moment, the abutting relation does not exist between the limiting member 3 and the piston 2, therefore the piston 2 does not be limited. While

[00008]$\frac{D_1+D_2}{2}>L,$

at this moment, the limiting member 3 abuts against the limiting surface 21, thereby limiting an auto-rotation of the piston 2.

[0067] At the same time, on this basis, in order to guarantee that a bottom portion of the limiting member 3 is not suspended in the air (abutting against the cylinder 1) while the limiting member 3 is mounted in the limiting hole 13, while the limiting member 3 abuts against the limiting surface 21, it should also be satisfied:

[00009]$L>\frac{D_1-D_2}{2}$

[0068] While

[00010]$L=\frac{D_1-D_2}{2},$

the limiting member 3 is mounted in the limiting hole 13, a bottom end face of the limiting member 3 and a bottom portion of the limiting hole 13 are positioned in the critical state of non-contact, at this moment, the limiting member 3 is a cantilever structure, an upper end of the limiting member 3 needs to be fixed and limited. While

[00011]$L>\frac{D_1-D_2}{2},$

a part of the bottom end face of the limiting member 3 abuts against the bottom portion of the limiting hole 13, the limiting member 3 has no cantilever structure, a force to the limiting member 3 indirectly acts on the cylinder 1 while the piston 2 has a tendency to the auto-rotation, a stress to the limiting member 3 is reduced, and a strength requirement to the limiting member is reduced.

[0069] As shown in FIG. 6, in some embodiments, the limiting hole 13 is extended to a position of ½ of an axial height of the cylinder 1 along an end face of the cylinder 1, and a length of the limiting member is increased, so that an abutting area between the limiting member and the limiting surface is larger, a pressure intensity of an abutting portion is small, and it is not easy to be deformed.

[0070] Structures and principles of the piston limiting structure in some embodiments are described above, it is to be noted that, on the basis of the above embodiments, the disclosure also has other replaceable embodiments.

[0071] FIG. 7 shows a second implementation mode of the piston limiting structure of the disclosure, in the embodiments, a difference from the above embodiments is that the number of the limiting members 3 is set as two, correspondingly two corresponding limiting holes 13 are arranged on the cylinder 1, the two limiting members 3 are respectively arranged on an upper end face of the cylinder 1 and positioned at two sides of an axis of the cylinder 1, the piston 2 is limited by the two limiting members 3, limiting reliability is improved, implementation parameters and limiting principles thereof are the same as the above embodiments, it is not repeatedly described in the implementation mode.

[0072] FIG. 8 shows a third embodiment of the piston limiting structure of the disclosure, in the embodiment, a difference from the above embodiments is that the limiting hole 13 is disposed at one side of a lower end face of the cylinder 1, implementation parameters and limiting principles are the same as the above embodiments.

[0073] FIG. 9 shows a fourth embodiment of the piston limiting structure of the disclosure, in the embodiment, two limiting holes 13 are arranged, and the two limiting holes 13 are respectively disposed at two sides of the axis of the lower end face of the cylinder 1, implementation parameters and limiting principles are the same as the above embodiments.

[0074] FIG. 10 shows a fifth embodiment of the piston limiting structure of the disclosure, in the embodiment, two limiting holes 13 are arranged, and the two limiting holes 13 are respectively disposed on the upper and lower end faces of the cylinder 1, and the two limiting holes 13 are respectively positioned at two sides of the axis of the cylinder 1, implementation parameters and limiting principles are the same as the above embodiments.

[0075] FIG. 11 shows a sixth embodiment of the piston limiting structure of the disclosure, in the embodiment, the limiting hole 13 penetrates the upper and lower end faces of the cylinder 1, the limiting member 3 is correspondingly disposed in the limiting hole 13, an axial length of the limiting member 3 is less than or equal to an axial length of the cylinder 1 and greater than a half of the axial length of the cylinder 1, implementation parameters and limiting principles are the same as the above embodiments.

[0076] FIG. 12 shows a seventh embodiment of the piston limiting structure of the disclosure, in the embodiment, the limiting hole 13 penetrates the upper and lower end faces of the cylinder 1, and two limiting holes 13 are arranged, and respectively positioned at two sides of the axis of the cylinder 1, each of the limiting members 3 is arranged in the corresponding limiting hole 13, the axial length of the limiting member 3 is less than or equal to the axial length of the cylinder 1 and greater than a half of the axial length of the cylinder 1, implementation parameters and limiting principles are the same as the above embodiments.

[0077] In other embodiments, the limiting member 3 may also be other arbitrary shapes suitable for implementation, for example, a cube, a plate shape and a column shape, this is not limited by the disclosure.

[0078] In some embodiments, the disclosure further provides a compressor, as shown in FIG. 1, the compressor of some embodiments of the disclosure includes a rotation shaft 6, an upper flange 4, a lower flange 5, a cylinder sleeve 7, and the above piston limiting structure, the cylinder 1 is disposed in the cylinder sleeve 7, the rotation shaft 6 successively penetrates the upper flange 4, the cylinder sleeve 7, and the lower flange 5. The compressor of the embodiments of the disclosure is based on the crosshead shoe principle, as shown in FIG. 2, while the compressor is worked, the rotation shaft 6 abuts against a wall surface of the shaft hole 22 of the piston hole 2, so that the piston 2 and the cylinder 1 are driven to be rotated in the cylinder sleeve 7, and because of eccentric rotation of the rotation shaft 6 and the cylinder 1, the piston 2 reciprocates relative to the cylinder 1, thereby a gas is compressed in a volume chamber at two ends of the piston 2. In some embodiments of the disclosure, through setting cooperation limiting of the limiting member 3 and the limiting surface 21 of the piston 2, a problem that collision to the cylinder due to the auto-rotation of the piston of the compressor is effectively avoided.

[0079] Some embodiments of the disclosure further provide a heat exchange apparatus, and the heat exchange apparatus includes the above compressor or piston limiting structure. The heat exchange apparatus is an air conditioner or a refrigerator.

[0080] Apparently, the above embodiments are merely examples for clear description, and are not intended to limit the implementation modes. Other changes or modifications in different forms are made on the basis of the above description by those of ordinary skill in the art. There is no need and may not be an exhaustive list of all of the embodiments. The apparent changes or modifications derived from this are still within a scope of protection of the present disclosure.