SCROLL FOR SCROLL COMPRESSOR AND SCROLL COMPRESSOR

Abstract

A scroll for a scroll compressor and a scroll compressor is disclosed. The scroll includes an end plate having first and second surfaces opposite to each other; a scroll wrap extending from the first surface of the end plate; and at least one oil hole including a first oil hole portion extending in the end plate, and a second oil hole portion extending in the end plate and the scroll wrap and extending from the first oil hole portion to a strip-shaped surface of the scroll wrap away from the end plate, the second oil hole portion having an opening in the strip-shaped surface of the scroll wrap. The oil hole reduces circulation rate of the lubricating oil and temperature of the discharged refrigerant.

Claims

1. A scroll for a scroll compressor, comprising: an end plate having a first surface and a second surface opposite to each other; a scroll wrap extending from the first surface of the end plate; and at least one oil hole, comprising: a first oil hole portion extending in the end plate, and a second oil hole portion extending from the first oil hole portion to a strip-shaped surface of the scroll wrap away from the end plate through the end plate and the scroll wrap; the second oil hole portion having an opening in the strip-shaped surface of the scroll wrap.

2. The scroll for the scroll compressor according to claim 1, further comprising: an annular recess formed in the second surface of the end plate, the first oil hole portion extending from the annular recess in a direction away from a rotation axis of the scroll and being in communication with the annular recess.

3. The scroll for the scroll compressor according to claim 2, further comprising: a hub portion extending from the second surface of the end plate, wherein the hub portion has an inner hole, the annular recess surrounds the hub portion, and the at least one oil hole further comprises: a third oil hole portion extending from the inner hole of the hub portion to the annular recess in a direction away from the rotation axis of the scroll, so as to communicate the inner hole of the hub portion with the annular recess.

4. The scroll for the scroll compressor according to claim 1, wherein: the first oil hole portion extends along a plane perpendicular to a rotation axis of the scroll, and the second oil hole portion extends in a direction parallel to the rotation axis of the scroll.

5. The scroll for the scroll compressor according to claim 1, wherein: the first oil hole portion extends along a plane inclined relative to a rotational axis of the scroll, and the second oil hole portion extends in a direction parallel to the rotational axis of the scroll.

6. The scroll for the scroll compressor according to claim 1, wherein: the first oil hole portion extends in a radial direction of the scroll.

7. The scroll for the scroll compressor according to claim 1, wherein: the opening of the second oil hole portion is located in an outer end of the strip-shaped surface of the scroll wrap.

8. The scroll for the scroll compressor according to claim 1, wherein: the opening of the second oil hole portion is spaced from an outer end of the strip-shaped surface of the scroll wrap by an angle of 175 to 185 degrees.

9. The scroll for the scroll compressor according to claim 1, wherein: the at least one oil hole comprises multiple oil holes, the opening of the second oil hole portion of a first oil hole among the multiple oil holes is located in an outer end of the strip-shaped surface of the scroll wrap, while the opening of the second oil hole portion of a second oil hole among the multiple oil holes is spaced from the opening of the second oil hole portion of the first oil hole by an angle of 175 to 185 degrees.

10. The scroll for the scroll compressor according to claim 1, further comprising: a strip-shaped groove located in the strip-shaped surface of the scroll wrap, wherein the opening of the second oil hole portion is located on an outer side of the strip-shaped groove.

11. The scroll for the scroll compressor according to claim 7, further comprising: a strip-shaped groove located in the strip-shaped surface of the scroll wrap, wherein the opening of the second oil hole portion is located on an outer side of an outer end of the strip-shaped groove in a circumferential direction of the scroll wrap.

12. The scroll for the scroll compressor according to claim 8, further comprising: a strip-shaped groove located in the strip-shaped surface of the scroll wrap, wherein the opening of the second oil hole portion is located on an outer side of the strip-shaped groove in a radial direction of the scroll wrap.

13. The scroll for the scroll compressor according to claim 9, further comprising: a strip-shaped groove located in the strip-shaped surface of the scroll wrap, wherein the opening of the second oil hole portion of the first oil hole among the multiple oil holes is located on an outer side of an outer end of the strip-shaped groove in a circumferential direction of the scroll wrap, and the opening of the second oil hole portion of the second oil hole among the multiple oil holes is located on an outer side of the strip-shaped groove in a radial direction of the scroll wrap.

14. A scroll compressor, comprising: the scroll according to claim 1.

15. A scroll compressor, comprising: a first scroll comprising a first end plate and a first scroll extending downwardly from the first end plate; a second scroll comprising a second end plate and a second scroll wrap extending upwardly from the second end plate, the second scroll and the first scroll being engaged with each other to form a compression chamber for compressing a refrigerant, the second scroll being the scroll according to claim 1; a motor; a driving member located below the second scroll, the motor driving a rotation of the first scroll by the driving member, and the first scroll driving a rotation of the second scroll; and a bracket, on which the driving member being rotatably supported.

16. The scroll compressor according to claim 15, wherein: the driving member comprises: a hub portion having an inner hole; and a flange portion extending radially and outwardly from an end of the hub portion of the driving member, the second end plate of the second scroll being rotatably supported on the flange portion of the driving member.

17. The scroll compressor of claim 16, further comprising: a scroll cover comprising: an end plate having a central hole; and a cylindrical portion extending downwardly from an outer periphery of the end plate, the cylindrical portion of the scroll cover being connected with the flange portion of the driving member, and the end plate of the scroll cover being connected with the first end plate of the first scroll.

18. The scroll compressor of claim 16, wherein: the first scroll comprises a scroll cover casted integrally therewith, the scroll cover comprising: an end plate having a central hole; and a cylindrical portion extending downwardly from an outer periphery of the end plate, the cylindrical portion of the scroll cover being connected with the flange portion of the driving member, and the end plate of the scroll cover being connected with the first end plate of the first scroll.

19. The scroll compressor of claim 16, further comprising: a fixed shaft, a lower end of which being fixed to the bracket, the hub portion of the driving member being rotatably mounted on the fixed shaft.

20. The scroll compressor of claim 16, wherein the second scroll further comprises: an annular recess formed in the second surface of the end plate, the first oil hole portion extending from the annular recess in a direction away from a rotation axis of the scroll and being in communication with the annular recess.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG. 1 is a schematic cross-sectional view of a scroll compressor according to an embodiment of the present disclosure;

[0026] FIG. 2 is a schematic perspective view of a second scroll of the scroll compressor shown in FIG. 1;

[0027] FIG. 3 is a schematic perspective view of the second scroll of the scroll compressor shown in FIG. 2, with the second scroll sectioned along a plane passing through a rotational axis of the second scroll; and

[0028] FIG. 4 is a schematic cross-sectional view of the second scroll of the scroll compressor shown in FIG. 2.

DETAILED DESCRIPTION

[0029] Embodiments of the present disclosure are described below with reference to the accompanying drawings.

[0030] Referring to FIG. 1, a scroll compressor 100 according to an embodiment of the present disclosure includes: a first scroll 1, a second scroll 2, a driving member 3, a bracket 4, a scroll cover 6, a fixed shaft 8 and a motor 7. The first scroll 1 includes a first end plate 11 and a first scroll wrap 12 extending downwardly from the first end plate 11, and the second scroll 2 includes a second end plate 21 and a second scroll wrap 22 extending upwardly from the second end plate 21, the second scroll wrap 22 and the first scroll wrap 12 being engaged with each other to form a compression chamber for compressing a medium. The driving member 3 is located below the second scroll 2 and includes: a hub portion 31 having an inner hole 30; and a flange portion 32 extending outwardly from an end 311 of the hub portion 31 in a radial direction of the hub portion 31. The bracket 4 is located on a side of the second scroll 2 away from the first scroll 1. The scroll cover 6 is connected with the flange portion 32 of the driving member 3, e.g., by bolts, and is connected with the first scroll 1, e.g., by bolts, whereby the driving member 3 is fixedly connected with the first scroll 1. The driving member 3 is rotatably mounted to the bracket 4 and is located on the side of the second scroll 2 away from the first scroll 1. The motor 7 drives a rotation of the first scroll 1 through the driving member 3 and the scroll cover 6, and the first scroll 1 drives a rotation of the second scroll 2. A lower end of the fixed shaft 8 is fixed to the bracket 4. The hub portion 31 of the driving member 3 is rotatably mounted on the fixed shaft 8 so that the driving member 3 is rotatably mounted to the support 4. The second end plate 21 of the second scroll 2 is rotatably supported on the flange portion 32 of the driving member 3. The scroll cover and the first scroll may be integrally casted.

[0031] Referring to FIG. 1, in the embodiment shown in FIG. 1, the scroll cover 6 includes: an end plate 61 having a central hole; and a cylindrical portion 62 extending downwardly from an outer periphery of the end plate 61, the cylindrical portion 62 of the scroll cover 6 being connected with the flange portion 32 of the driving member 3, and the end plate 61 of the scroll cover 6 being connected with the first end plate 11 of the first scroll 12. Referring to FIG. 1, in the embodiment of the present disclosure, the motor 7 may be an axial flux motor or a radial flux motor. In some embodiments, the motor 7 includes a rotor 71 and a stator 72 fixed to the bracket 4, and the rotor 71 of the motor 7 drives the rotation of the first scroll 11 by driving the rotation of the driving member 3.

[0032] The second scroll 2 according to the embodiments of the present disclosure will be described in detail below. For convenience, the second scroll 2 will be referred to as the scroll 2 below.

[0033] Referring to FIGS. 2 to 4, the scroll 2 according to the embodiments of the present disclosure includes: an end plate 21 having a first surface 211 and a second surface 212 opposite to each other; a scroll wrap 22 extending from the first surface 211 of the end plate 21; and at least one oil hole 5. The oil hole 5 includes a first oil hole portion 51 extending in the end plate 21, and a second oil hole portion 52 extending in the end plate 21 and the scroll wrap 22 and extending from the first oil hole portion 51 to a strip-shaped surface 220 of the scroll wrap 22 away from the end plate 21, the second oil hole portion 52 having an opening 50 in the strip-shaped surface 220 of the scroll wrap 22.

[0034] Referring to FIGS. 3 and 4, in the embodiments of the present disclosure, the scroll 2 further includes: an annular recess 2120 formed in the second surface 212 of the end plate 21, the first oil hole portion 51 extending from the annular recess 2120 in a direction away from a rotation axis of the scroll 2 and being in communication with the annular recess 2120. Referring to FIGS. 2 to 4, the scroll 2 further includes a hub portion 23 extending from the second surface 212 of the end plate 21, the hub portion 23 has an inner hole 230 and the annular recess 2120 surrounds the hub portion 23. The oil hole 5 may further include: a third oil hole portion extending from the inner hole 230 of the hub portion 23 to the annular recess 2120 in the direction away from the rotation axis of the scroll 2, so as to communicate the inner hole 230 of the hub portion 23 with the annular recess 2120.

[0035] In the embodiments shown in FIGS. 3 and 4, the first oil hole portion 51 extends along a plane inclined relative to the rotation axis of the scroll 2, while the second oil hole portion 52 extends along a direction parallel to the rotation axis of the scroll 2. Referring to FIGS. 3 and 4, in the embodiments of the present disclosure, in the case of adopting multiple oil holes 5, the multiple first oil hole portions 51 may extend along the corresponding planes, respectively, or along the same conical face. Alternatively, the first oil hole portion 51 may extend in a plane perpendicular to the rotation axis of the scroll 2, while the second oil hole portion 52 may extend in a direction parallel to the rotation axis of the scroll 2. Obviously, the second oil hole portion 52 only needs to extend in the end plate 21 and the scroll wrap 22 and extend from the first oil hole portion 51 to the strip-shaped surface 220 of the scroll wrap 22 away from the end plate 21. It is not limited to extend along a specific direction. As an example, the first oil hole portion 51 extends in a radial direction of the scroll 2. Or, when viewed in a direction parallel to the rotation axis of the scroll 2, the first oil hole portion 51 extends in the radial direction of the scroll 2.

[0036] Referring to FIGS. 2 to 4, in the embodiments of the present disclosure, there are multiple oil holes 5, and the opening 50 of the second oil hole portion 52 of a first oil hole 5A among the multiple oil holes 5 is located in an outer end 2201 of the strip-shaped surface 220 of the scroll wrap 22, while the opening 50 of the second oil hole portion 52 of a second oil hole 5B among the multiple oil holes 5 is spaced from the opening 50 of the second oil hole portion 52 of the first oil hole 5A among the multiple oil holes 5 by an angle of 175 to 185 degrees, e.g., 180 degree, that is, center lines of the two openings 50 are approximately located in a plane passing through the rotation axis of the scroll 2. In the embodiments shown in the figures, the center lines of the first oil hole portions 51, the second oil hole portions 52 and the openings 50 of the two oil holes 5 are approximately located in a plane passing through the rotation axis of the scroll 2. When viewed in a direction parallel to the rotation axis of the scroll 2, the strip-shaped surface 220 has an inner end close to the rotation axis of the scroll 2 and an outer end 2201 away from the rotation axis of the scroll 2. In the case that only one oil hole 5 is provided, the opening 50 of the second oil hole portion 52 is located in the outer end 2201 of the strip-shaped surface 220 of the scroll wrap 22, or else, the opening 50 of the second oil hole portion 52 is spaced from the outer end 2201 of the strip-shaped surface 220 of the scroll wrap 22 by an angle of 175 to 185 degrees, for example, an angle of 180 degree.

[0037] Referring to FIGS. 2 to 4, in the embodiments of the present disclosure, the scroll 2 further includes: a strip-shaped groove 221 located in the strip-shaped surface 220 of the scroll wrap 22, and a sealing member may be placed in the strip-shaped groove 221. The opening 50 of the second oil hole portion 52 is located on an outer side of the strip-shaped groove 221. More specifically, the opening 50 of the second oil hole portion 52 of the first oil hole 5A among the multiple oil holes 5 is located on an outer side of an outer end 2210 of the strip-shaped groove 221 in a circumferential direction of the scroll wrap 22, and the opening 50 of the second oil hole portion 52 of the second oil hole 5B among the multiple oil holes 5 is located on an outer side of the strip-shaped groove 221 in a radial direction of the scroll wrap 22. In the case that only one oil hole 5 is provided, the opening 50 of the second oil hole portion 52 is located on the outer side of the outer end 2210 of the strip-shaped groove 221 in the circumferential direction of the scroll wrap 22, or else, the opening 50 of the second oil hole portion 52 is located on the outer side of the strip-shaped groove 221 in the radial direction of the scroll wrap 22.

[0038] It should be noted that although the first oil hole portion 51 has the opening in an outer peripheral surface of the end plate 21 in the figures, in fact, it is just to facilitate the processing of the first oil hole portion 51. After the first oil hole portion 51 is formed, the opening of the first oil hole portion 51 in the outer peripheral surface of the end plate 21 will be blocked by a plug or other parts.

[0039] During operation of the compressor, a lubricating oil is first pumped by a pump from an oil sump to the hub portion 23 of the scroll 2, and under the action of a centrifugal force, the lubricating oil enters the oil hole 5 and flows out of the opening 50 at the end of the scroll 22, thereby reducing the circulation rate of the lubricating oil and the temperature of the discharged refrigerant.

[0040] The scroll compressor according to the embodiments of the present disclosure, may improve the performance of the scroll compressor by adopting the oil hole 5 according to the embodiments of the present disclosure. For example, the effect of superheating on the refrigerant may be minimized, and the leakage of the lubricating oil during compression may be minimized, and the circulation rate of the lubricating oil and the temperature of the discharged refrigerant may be reduced. The mass flow rate and energy efficiency ratio may be improved by reducing the circulation rate of the lubricating oil and the leakage of the lubricating oil.

[0041] The scroll compressor according to the embodiments of the present disclosure, contributes to improve the lubrication ability and reduce the wear between the scroll wraps and to achieve better sealing between the scroll wraps, by adopting the oil hole 5 according to the embodiments of the present disclosure. In addition, it can suppress rising of the temperature of the compressed refrigerant in the compression chamber.

[0042] Although the above embodiments are described, some features of the above embodiments may be combined to form new embodiments.

[0043] While the present disclosure has been illustrated and described with respect to a particular embodiment thereof, it should be appreciated by those of ordinary skill in the art that various modifications to this disclosure may be made without departing from the spirit and scope of the present disclosure.