Scroll compressor

Abstract

The embodiment of the utility model relates to the technical field of scroll compressors, and particularly discloses a scroll compressor which comprises a first scroll plate, a second scroll plate and a crank module. The second scroll plate is provided with a first positioning surface and a mounting groove; the crank module comprises a crank pin, a bearing assembly, a limiting assembly and an elastic piece. The crank pin is provided with a second positioning surface, and the first scroll plate is connected with one end of the crank pin and abuts against the second positioning surface; the bearing assembly is arranged in the mounting groove, and the other end of the crank pin is inserted into the bearing assembly; the limiting assembly abuts against the first positioning face and the bearing assembly. The elastic piece is arranged in the mounting groove and abuts against the end, away from the limiting assembly, of the bearing assembly. The elastic force is applied to the bearing assembly through the elastic piece, so that the end face of the bearing assembly is flush with the first positioning face, the crank pin is provided with the second positioning face to be assembled and limited with the first scroll plate, and therefore the axial assembling precision of the first scroll plate and the second scroll plate is guaranteed, and the influence of part manufacturing errors on the assembling precision is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of scroll compressors, and in particular to a scroll compressor. Background Art

[0002] A scroll compressor is mainly composed of two meshing scroll plates, one is a fixed scroll plate and the other is a movable scroll plate. A crank pin is usually provided on the scroll compressor. The crank pin is a structure that prevents the movable scroll plate from rotating on its own, so that it moves linearly around the fixed scroll plate. The axial size of the crank pin affects the axial sealing of the movable scroll plate and the fixed scroll plate, thereby affecting the volumetric efficiency of the compressor. In the related art, one end of the crank pin is installed in the mounting hole on the scroll plate through a bearing and is locked and fixed by a nut. Due to the existence of part manufacturing errors and the influence of dimensions such as bearing thickness and mounting hole depth, the axial assembly accuracy of the two scroll plates is often affected. Utility Model Content

[0003] In view of the above problems, an embodiment of the present application provides a scroll compressor that overcomes the above problems or at least partially solves the above problems.

[0004] According to one aspect of the present application, a scroll compressor is provided, comprising a first scroll, a second scroll and a crank module; the second scroll is meshed with the first scroll, and the second scroll is provided with a first positioning surface and a mounting groove, the first positioning surface is provided at one end of the second scroll facing the first scroll, and the mounting groove extends from the first positioning surface toward the other end of the second scroll; the crank module is respectively connected to the first scroll and the second scroll, and the crank module comprises a crank pin, a bearing assembly, a limit assembly and an elastic member; wherein the crank pin is provided with a second positioning surface, one end of the crank pin is inserted into the first scroll, and the second positioning surface abuts the first scroll; the bearing assembly is arranged in the mounting groove, and the other end of the crank pin is inserted into the bearing assembly; the limit assembly abuts the first positioning surface, and the limit assembly abuts the end of the bearing assembly facing the first scroll; the elastic member is arranged in the mounting groove, and the elastic member abuts the end of the bearing assembly away from the first scroll.

[0005] In an optional manner, the crank pin includes a first plug-in portion, a connecting portion and a second plug-in portion connected in sequence, the first plug-in portion is inserted into the first scroll plate, and the second plug-in portion is inserted into the bearing assembly; the outer diameter of the connecting portion is larger than the outer diameter of the first plug-in portion, and the second positioning surface is provided at one end of the connecting portion facing the first plug-in portion.

[0006] In an optional manner, the central axis of the first plug-in portion and the central axis of the second plug-in portion are parallel and do not overlap.

[0007] In an optional manner, the bearing assembly includes a bearing inner ring and a bearing outer ring, the bearing outer ring is sleeved outside the bearing inner ring, and the bearing inner ring can rotate relative to the bearing outer ring; the crank pin is inserted into the bearing inner ring, and the limit assembly abuts against the bearing outer ring.

[0008] In an optional manner, the crank pin and the bearing inner ring are interference fit; and / or the bearing outer ring and the mounting groove are transition fit.

[0009] In an optional manner, the limiting assembly includes a limiting ring plate, which is arranged outside the crank pin, and one end of the limiting ring plate facing away from the first scroll plate abuts against the first positioning surface and the bearing assembly respectively.

[0010] In an optional manner, the limiting assembly further includes at least one fastener, and the at least one fastener is respectively connected to the limiting ring plate and the second scroll plate.

[0011] In an optional manner, the crank module further includes a pad, which is disposed in the mounting groove, and an end of the elastic member facing away from the bearing assembly abuts against the pad.

[0012] In an optional manner, the pad includes a connected annular bottom and a raised portion, one side of the annular bottom abuts against the bottom of the mounting groove, and the raised portion extends from the other side of the annular bottom toward the bearing assembly; the elastic member includes a disc spring, the disc spring is sleeved outside the raised portion, and the elastic member abuts against one side of the annular bottom facing away from the groove bottom.

[0013] In an optional manner, the number of the crank modules is at least two, and at least two crank modules are arranged at intervals along the circumference of the first scroll plate.

[0014] The beneficial effect of the embodiment of the present application is: different from the prior art, the second scroll plate of the embodiment of the present application is provided with a first positioning surface and a mounting groove, the bearing assembly is provided in the mounting groove, one end of the crank pin is inserted in the bearing assembly, the limiting assembly respectively abuts the first positioning surface and the bearing assembly, the elastic member is provided in the mounting groove and abuts the end of the bearing assembly away from the limiting assembly, and an elastic force is applied to the bearing assembly by the elastic member so that the bearing assembly always abuts the limiting assembly, thereby making the end face of the bearing assembly flush with the first positioning surface to ensure the press-fitting depth of the bearing assembly in the mounting groove, and the crank pin is provided with a second positioning surface for assembling and limiting with the first scroll plate, thereby ensuring the axial assembly accuracy of the first scroll plate and the second scroll plate, reducing the influence of parts manufacturing errors on the assembly accuracy, and thereby reducing the influence on the volumetric efficiency of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] To more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0016] Figure 1 This is a side sectional view of the overall structure of the scroll compressor according to an embodiment of the present application;

[0017] Figure 2 This is a side sectional view of a partial structure of a scroll compressor according to an embodiment of the present application;

[0018] Figure 3 yes Figure 2 A magnified schematic diagram of the structure in the middle. DETAILED DESCRIPTION

[0019] In order to facilitate understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.

[0020] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification and in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the relevant listed items.

[0021] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0022] See also Figure 1 and Figure 2 The scroll compressor 1000 includes a first scroll 10, a second scroll 20, and a crank module. The first scroll 10 and the second scroll 20 are meshed, and the crank module connects the first scroll 10 and the second scroll 20, respectively. The second scroll 20 is provided with a first positioning surface 20b and a mounting groove 20a. The first positioning surface 20b is provided at one end of the second scroll 20 facing the first scroll 10, and the mounting groove 20a extends from the first positioning surface 20b toward the other end of the second scroll 20. The crank module includes a crank pin 30, a bearing assembly 40, a stop assembly 50, and an elastic member 60. The bearing assembly 40 is sleeved on the crank pin 30, and the stop assembly 50 and the elastic member 60 are respectively provided at opposite ends of the bearing assembly 40 in the axial direction. The crank pin 30 is provided with a second positioning surface 30a. One end of the crank pin 30 is inserted into the first scroll 10, and the second positioning surface 30a abuts the first scroll 10. The bearing assembly 40 is disposed within the mounting groove 20a, with the other end of the crankpin 30 inserted into the bearing assembly 40. The stopper assembly 50 abuts the first positioning surface 20b and partially covers the mounting groove 20a, so that the stopper assembly 50 abuts the end of the bearing assembly 40 facing the first scroll 10. The elastic member 60 is disposed within the mounting groove 20a and abuts the end of the bearing assembly 40 facing away from the first scroll 10.

[0023] It should be noted that the first scroll 10 is one of an orbiting scroll and a fixed scroll, and the second scroll 20 is the other of the fixed scroll and the orbiting scroll. Users can choose to install them according to actual needs. In this application, the first scroll 10 is an orbiting scroll and the second scroll 20 is a fixed scroll for example.

[0024] In some embodiments, the crankpin 30 includes a first plug-in portion 301, a connecting portion 302, and a second plug-in portion 303, which are sequentially connected. The first plug-in portion 301 is inserted into the first scroll 10, and the second plug-in portion 303 is inserted into the bearing assembly 40 to achieve the connection between the first scroll 10 and the second scroll 20. The outer diameter of the connecting portion 302 is larger than the outer diameter of the first plug-in portion 301, so that the end of the connecting portion 302 facing the first plug-in portion 301 forms a second positioning surface 30a.

[0025] In some embodiments, the central axis of the first plug-in portion 301 and the central axis of the second plug-in portion 303 are parallel and do not overlap, so that the crank pin 30 can drive the first scroll 10 to rotate eccentrically relative to the second scroll 20 .

[0026] In some embodiments, a rotatable connection is provided between the first plug-in portion 301 and the first scroll 10. For example, a bearing is provided between the first plug-in portion 301 and the first scroll 10 so that the first plug-in portion 301 can rotate relative to the first scroll 10; or, the first plug-in portion 301 and the first scroll 10 can also be provided with a fixed connection, and the first plug-in portion 301 drives the first scroll 10 to rotate; the connection method between the first plug-in portion 301 and the first scroll 10 is not limited here.

[0027] In some embodiments, the bearing assembly 40 includes a bearing inner ring 401 and a bearing outer ring 402. The bearing outer ring 402 is sleeved on the outside of the bearing inner ring 401. The bearing inner ring 401 can rotate relative to the bearing outer ring 402. The crank pin 30 is inserted into the bearing inner ring 401. The bearing outer ring 402 is fixed in the mounting groove 20a, and the end face of the bearing outer ring 402 is abutted against the limit assembly 50, thereby enabling the crank pin 30 to rotate relative to the second scroll plate 20.

[0028] In some embodiments, the bearing assembly 40 further includes a plurality of balls (not shown), which are disposed between the bearing inner ring 401 and the bearing outer ring 402, so that the bearing inner ring 401 and the bearing outer ring 402 do not directly contact each other, thereby reducing the friction between the bearing inner ring 401 and the bearing outer ring 402. It is understood that in some other embodiments, the bearing assembly may not include balls, and the bearing inner ring 401 may directly contact the bearing outer ring 402. The manner in which the bearing inner ring 401 and the bearing outer ring 402 cooperate is not limited herein.

[0029] In some embodiments, the crankpin 30 and the bearing inner race 401 have an interference fit, and the bearing outer race 402 and the mounting groove 20a have an overfit, thereby achieving connection between the crankpin 30 and the bearing inner race 401, and between the bearing outer race 402 and the mounting groove 20a. It is understood that the fit between the crankpin and the bearing inner race 401, and between the bearing outer race 402 and the mounting groove can be configured according to actual needs and is not limited here.

[0030] In some embodiments, the bearing assembly 40 includes at least one bearing, including a first bearing 40 a and a second bearing 40 b . The first bearing 40 a and the second bearing 40 b are both sleeved on the crank pin 30 . The first bearing 40 a and the second bearing 40 b are coaxially arranged and arranged along a first direction. The first direction is the axial direction of the crank pin 30 .

[0031] In some embodiments, the first bearing 40a and the second bearing 40b each include a bearing outer ring 402, and each include a bearing inner ring 401. The outer ring 402 of the first bearing 40a and the outer ring 402 of the second bearing 40b both abut against the inner wall of the mounting groove 20a. A transition fit is formed between the first bearing 40a and the inner wall of the mounting groove 20a, and / or between the second bearing 40b and the inner wall of the mounting groove 20a. This connects the outer ring 402 of the first bearing 40a and the inner wall of the mounting groove 20a, and the outer ring 402 of the second bearing 40b and the inner wall of the mounting groove 20a. The inner ring 401 of the first bearing 40a and / or the inner ring 401 of the second bearing 40b are connected to the crank pin 30 using an interference fit.

[0032] The limiting assembly 50 includes a limiting ring plate 501 and at least one fastener 502. The limiting ring plate 501 is arranged around the outside of the crank pin 30. The limiting ring plate 501 covers the opening of the mounting groove 20a, and the end of the limiting ring plate 501 facing away from the first scroll plate 10 abuts the first positioning surface 20b and the bearing assembly 40 respectively. At least one fastener 502 connects the limiting ring plate 501 and the second scroll plate 20 respectively to fasten the limiting ring plate 501 to the second scroll plate 20. The elastic member 60 is arranged in the mounting groove 20a, and the elastic member 60 abuts against the end of the bearing assembly 40 facing away from the first scroll plate. When assembling the crank module, the elastic member 60 is first placed in the mounting groove 20a, and then the assembly of the crank pin 30 and the bearing assembly 40 is installed in the mounting groove 20a, and then the limiting ring plate 501 is installed on the first positioning surface 20b. Under the action of the rebound force of the elastic member 60, the assembly of the crank pin 30 and the bearing assembly 40 moves toward the notch of the mounting groove 20a and abuts against the above-mentioned limiting ring plate 501, thereby achieving axial limiting and fixing of the bearing assembly 40 and the crank pin 30, and further achieving the limitation of the axial size of the crank pin 30. Among them, the fastener 502 is a screw, and the limiting ring plate 501 is screwed and fixed to the second scroll plate 20 through the fastener 502. It should be noted that in some other embodiments, the fastener 502 can also be set to other structures, such as a clamp, a buckle, etc., which are not limited here. It is understandable that in some other embodiments, the fastener 502 may be omitted, and the limiting ring plate 501 may be fixed to the second scroll plate 20 by bonding, welding, etc., which is not limited here.

[0033] In some embodiments, the crank module further includes a backing plate 70, which is disposed within the mounting groove 20a and abuts against the end of the elastic member 60 facing away from the bearing assembly 40. The backing plate 70 includes a connected annular base 701 and a raised portion 702. One side of the annular base 701 abuts against the bottom of the mounting groove 20a, and the raised portion 702 extends from the other side of the annular base 701 toward the bearing assembly 40. In this embodiment, the elastic member 60 is a disc spring. The elastic member 60 is sleeved around the raised portion 702 and abuts against the side of the annular base 701 facing away from the groove bottom. The raised portion 702 serves to limit the elastic member 60 and facilitates its installation. It is understood that in other embodiments, the elastic member 60 may also be configured as other structures, such as a spring, a compression spring, etc., which are not limited herein.

[0034] It should be noted that the pad 70 is arranged between the elastic member 40 and the mounting groove 20a. The pad 70 can support the elastic member 60, prevent the elastic member 60 from directly contacting the bottom of the mounting groove 20a, and prevent the mounting groove 20a from being unable to withstand the work of the elastic member 60 due to the soft material of its bottom, thereby reducing the wear of the bottom of the mounting groove 20a.

[0035] In some embodiments, there are multiple elastic members 60, and the multiple elastic members 60 are stacked along the first direction. The multiple elastic members 60 can provide sufficient resilience for the crank pin 30 and the bearing assembly 40, so that the crank pin 30 and the bearing assembly 40 rebound to the target height.

[0036] In some embodiments, the rebound pressure of the elastic member 60 is F, the friction force between the first bearing 40a and the inner wall of the mounting groove 20a along the first direction is F1, the friction force between the second bearing 40b and the inner wall of the mounting groove 20a along the first direction is F2, and F1 < F, and / or, F2 < F. This arrangement can ensure that the elastic member 60 can effectively make the first bearing 40a and the second bearing 40b move along the first direction, so that the bearing assembly 40 and the crank pin 30 move along the first direction to abut the limit assembly 50.

[0037] In some embodiments, please refer to Figure 3 When assembling the crank module with the first and second scrolls 10 and 20, the crank pin 30 and bearing assembly 40 are first assembled together to form a combination, ensuring that the distance between the end surface of the bearing assembly 40 facing the first scroll and the second positioning surface 30a is H. The combination of the backing plate 70, the elastic member 60, the crank pin 30, and the bearing assembly 40 is then assembled into the mounting groove 20a. The stopper assembly 50 is then installed onto the first positioning surface 20b of the second scroll 20, ensuring that the end surface of the bearing assembly 40 facing the first scroll is flush with the first positioning surface 20b. That is, the distance between the second positioning surface 30a and the first positioning surface 20b is H1, and H=H1. This arrangement ensures that the press-fit depth of the bearing assembly 40 within the mounting groove 20a during assembly is within a preset range, thereby ensuring the axial assembly accuracy between the first scroll 10 and the second scroll 20.

[0038] In some embodiments, there are three crank modules, which are spaced apart along the circumference of the first scroll 10 to prevent the first scroll 10 from rotating. It is understood that in other embodiments, the number of crank modules can be set according to actual needs, such as two, four, or five, as long as there are at least two crank modules, which is not limited here.

[0039] In the embodiment of the present application, a first scroll 10, a second scroll 20 and a crank module are provided. Among them, the second scroll 20 is engaged with the first scroll 10, and the second scroll 20 is provided with a first positioning surface 20b and a mounting groove 20a. The first positioning surface 20b is provided at one end of the second scroll 20 facing the first scroll 10, and the mounting groove 20a extends from the first positioning surface 20b toward the other end of the second scroll 20. The crank module is respectively connected to the first scroll 10 and the second scroll 20. The crank module includes a crank pin 30, a bearing assembly 40, a limit assembly 50 and an elastic member 60. The crank pin 30 A second positioning surface 30a is provided, one end of the crank pin 30 is inserted in the first scroll 10, the second positioning surface 30a abuts the first scroll 10, the bearing assembly 40 is arranged in the mounting groove 20a, the other end of the crank pin 30 is inserted in the bearing assembly 40, the limit assembly 50 abuts the first positioning surface 20b, the limit assembly 50 abuts one end of the bearing assembly 40 toward the first scroll 10, the elastic member 60 is arranged in the mounting groove 20a, and the elastic member 60 abuts one end of the bearing assembly 40 away from the first scroll 10. During assembly, the crank pin 30 and the bearing assembly 40 are first pressed together, and the distance between the second positioning surface 30a on the crank pin 30 and the bearing assembly 40 along the axial direction of the crank pin 30 is adjusted. Then, the bearing assembly 40 and the crank pin 30 are installed in the installation groove 20a, and the limiting assembly 50 is used to abut the first positioning surface 20b on the first scroll 10, and the limiting assembly 50 abuts the end of the bearing assembly 40 facing the first scroll 10, so that the second positioning surface 30a on the crank pin 30 is close to the first scroll 10. 0 along the axial direction of the crank pin 30 is within a preset range, so that the bearing assembly 40 and the crank pin 30 are axially limited and fixed on the crank pin 30 to ensure the press-fitting depth of the bearing assembly 40 in the mounting groove 20a, thereby limiting the axial dimension of the crank pin 30 and reducing the influence of the axial dimension accuracy of the crank pin 30 on the bearing thickness and the mounting hole depth, thereby ensuring the assembly accuracy between the first scroll 10 and the second scroll 20, and reducing the influence on the volumetric efficiency of the compressor.

[0040] The above description is merely an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A scroll compressor, characterized in that: include: a first scroll; a second scroll engaged with the first scroll, the second scroll being provided with a first positioning surface and a mounting groove, the first positioning surface being provided at one end of the second scroll facing the first scroll, the mounting groove extending from the first positioning surface toward the other end of the second scroll; a crank module, connected to the first scroll and the second scroll respectively, the crank module comprising a crank pin, a bearing assembly, a limit assembly and an elastic member; The crank pin is provided with a second positioning surface, one end of the crank pin is inserted into the first scroll, and the second positioning surface abuts against the first scroll; The bearing assembly is arranged in the mounting groove, and the other end of the crank pin is inserted into the bearing assembly; The limiting assembly abuts against the first positioning surface, and the limiting assembly abuts against one end of the bearing assembly facing the first scroll plate; The elastic member is disposed in the mounting groove, and the elastic member abuts against an end of the bearing assembly that faces away from the first scroll plate.

2. The scroll compressor according to claim 1, wherein: The crank pin includes a first plug-in portion, a connecting portion, and a second plug-in portion that are sequentially connected, the first plug-in portion being inserted into the first scroll plate, and the second plug-in portion being inserted into the bearing assembly; The outer diameter of the connecting portion is greater than the outer diameter of the first plug-in portion, and the second positioning surface is provided at one end of the connecting portion facing the first plug-in portion.

3. The scroll compressor according to claim 2, wherein: The central axis of the first plug-in portion and the central axis of the second plug-in portion are parallel and do not overlap.

4. The scroll compressor according to claim 1, wherein The bearing assembly comprises a bearing inner ring and a bearing outer ring, wherein the bearing outer ring is sleeved outside the bearing inner ring, and the bearing inner ring is rotatable relative to the bearing outer ring; The crank pin is inserted into the bearing inner ring, and the limiting assembly abuts against the bearing outer ring.

5. The scroll compressor according to claim 4, wherein: The crank pin is interference fit with the bearing inner ring; and / or, The bearing outer ring is transitionally matched with the mounting groove.

6. The scroll compressor according to claim 1, wherein: The limiting assembly includes a limiting ring plate, which is arranged around the crank pin, and one end of the limiting ring plate away from the first scroll plate abuts against the first positioning surface and the bearing assembly respectively.

7. The scroll compressor according to claim 6, characterized in that The limiting assembly further includes at least one fastener, and the at least one fastener is respectively connected to the limiting ring plate and the second scroll plate.

8. The scroll compressor according to claim 1, wherein: The crank module further includes a pad, which is disposed in the mounting groove, and one end of the elastic member facing away from the bearing assembly abuts against the pad.

9. The scroll compressor according to claim 8, wherein: The backing plate includes an annular bottom and a protruding portion connected to each other, one side of the annular bottom abuts against the bottom of the mounting groove, and the protruding portion extends from the other side of the annular bottom toward the bearing assembly; The elastic member includes a disc spring, which is sleeved outside the protruding portion, and the elastic member abuts against a side of the annular bottom facing away from the groove bottom.

10. The scroll compressor according to any one of claims 1 to 9, characterized in that: The number of the crank modules is at least two, and the at least two crank modules are spaced apart along the circumference of the first scroll.

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