scroll compressor

Abstract

The present disclosure relates to a scroll compressor, comprising: a compression mechanism, the compression mechanism including a fixed scroll and a movable scroll, the movable scroll being configured to be able to orbit relative to the fixed scroll to compress a working fluid; a housing, the housing defining an internal space for accommodating the compression mechanism; a main bearing seat, the main bearing seat being fixed to the housing and supporting the movable scroll; and an axially flexible mounting mechanism, the fixed scroll being connected to the main bearing seat via the axially flexible mounting mechanism so that the fixed scroll can move a predetermined distance in an axial direction, the axially flexible mounting mechanism comprising: a fastener having a head; a sleeve arranged at the outer periphery of the fastener; and a shim portion at least partially arranged axially between the head of the fastener and the sleeve, the shim portion being able to engage with the housing so that the housing can provide radial support to the shim portion.

Description

Technical Field

[0001] The present invention relates to a scroll compressor, and more particularly to an axially flexible mounting mechanism for a scroll compressor. Background Art

[0002] The contents in this section merely provide background information related to the present disclosure and may not constitute prior art.

[0003] Scroll compressors can be used in, for example, refrigeration systems, air-conditioning systems, and heat pump systems. The scroll compressor includes a compression mechanism for compressing a working fluid (such as a refrigerant), a main bearing seat for supporting the compression mechanism, a rotating shaft for driving the compression mechanism, and a motor for driving the rotating shaft to rotate. The compression mechanism includes a fixed scroll and a movable scroll that revolves relative to the fixed scroll. Both the fixed scroll and the movable scroll include an end plate and a spiral blade extending from one side of the end plate. When the movable scroll revolves relative to the fixed scroll, a series of moving compression chambers are formed between the spiral blades of the fixed scroll and the movable scroll, the volume of which gradually decreases from the radial outside to the radial inside, thereby compressing the working fluid.

[0004] During normal operation of a scroll compressor, a good seal must be achieved between the tip of the spiral blade of one of the fixed and orbiting scrolls and the end plate of the other. On the other hand, for example, when the pressure in the compression chamber of the scroll compressor is too high, the spiral blade can separate from the end plate to unload the high-pressure fluid, thereby preventing damage to the compression mechanism.

[0005] To this end, the fixed scroll is mounted to the main bearing seat by an axially flexible mounting mechanism so that the fixed scroll can move axially a certain distance relative to the orbiting scroll. The axially flexible mounting mechanism generally includes a fastener and a sleeve located outside the fastener. The fastener is inserted into the mounting hole of the fixed scroll's lug to thread the fixed scroll to the main bearing seat. The sleeve is also inserted into the mounting hole of the fixed scroll and is arranged between the fastener head and the main bearing seat so that there is a certain gap between the fastener head and the fixed scroll's lug to allow for axial movement of the fixed scroll. The fastener is generally a screw, bolt, or the like.

[0006] However, as scroll compressors operate, the risk of sleeve slippage increases significantly as rotational speed increases. Furthermore, bolts can loosen or even break, and the connection between the main bearing and the bolts poses a risk of cracking. Furthermore, the risk of sleeve slippage and the risk of bolt breakage are mutually exclusive, making it difficult to balance the two. Therefore, the structural design of the bolted connection has become a bottleneck in the design of axially flexible variable-frequency compressors. Summary of the Invention

[0007] The present disclosure provides a scroll compressor that can simultaneously reduce the risk of sleeve sliding and the risk of bolt and main bearing seat fracture and failure. In the scroll compressor according to the present disclosure, the contradiction between the risk of sleeve sliding and the risk of bolt fracture is eliminated, so that the structural design of the bolt connection is no longer a design bottleneck for axially flexible variable frequency compressors.

[0008] According to one aspect of the present disclosure, a scroll compressor is provided, including a compression mechanism, the compression mechanism including a fixed scroll and a movable scroll, the movable scroll being configured to be able to orbit relative to the fixed scroll to compress a working fluid; a housing, the housing defining an internal space for accommodating the compression mechanism; a main bearing seat, the main bearing seat being fixed to the housing and supporting the movable scroll; and an axially flexible mounting mechanism, the fixed scroll being connected to the main bearing seat via the axially flexible mounting mechanism so that the fixed scroll can move a predetermined distance in an axial direction, the axially flexible mounting mechanism comprising: a fastener having a head; a sleeve arranged on the outer periphery of the fastener; and a shim portion at least partially arranged axially between the head of the fastener and the sleeve, the shim portion being able to engage with the housing so that the housing can provide radial support to the shim portion.

[0009] Optionally, the backing plate portion is rigidly connected to the housing, or a clearance fit is formed between the backing plate portion and the housing, so that the backing plate portion engages with the housing when the radial load on the sleeve reaches a predetermined value. The rigid connection includes direct welding, zero interference fit, or riveting to the housing, or an indirect fixed connection to the housing via other components.

[0010] Optionally, the backing plate portion includes a body portion and a flange portion extending outwardly from a radially outer side of the body portion, the body portion is provided with a hole for the fastener to pass through, and the flange portion is configured to be engageable with the housing.

[0011] Optionally, the flange portion is configured to extend radially outward from the body portion and has a radially outer sidewall configured to be radially engageable with the housing.

[0012] Optionally, the flange portion is configured to include a radially extending portion and an axially extending portion, the radially extending portion extending radially outward from the body portion, the axially extending portion extending axially from the radially extending portion in a direction away from the threaded portion of the fastener connected to the main bearing seat, and the distal end of the axially extending portion has a connecting end portion configured to be axially or radially engaged with the housing.

[0013] Optionally, the plurality of fasteners share one backing plate portion, which is constructed as a single integral annular member in which a plurality of body portions and a plurality of flange portions are interconnected by a connecting portion.

[0014] Optionally, each of the plurality of fasteners is correspondingly provided with a backing plate portion, and the backing plate portion includes a body portion and a flange portion.

[0015] Optionally, the flange portion of each backing plate portion extends outward from the body portion in a direction deviating from the radial direction.

[0016] Optionally, the backing plate portion and the fastener are formed as one body or as separate bodies, and in the case where the backing plate portion and the fastener are formed as separate bodies, a main body portion of the backing plate portion forms a clearance fit with the fastener.

[0017] Optionally, the pad portion also includes a cylindrical portion extending axially toward the threaded portion of the fastener connected to the main bearing seat, and there is an axial gap between the axial free end surface of the cylindrical portion and the fixed vortex to limit a predetermined distance that the fixed vortex moves axially.

[0018] Optionally, the cylindrical portion is a hollow cylindrical portion so as to define a space for accommodating at least a portion of the sleeve.

[0019] Optionally, the cylindrical portion of the backing plate portion forms a clearance fit with the sleeve.

[0020] From the detailed description below, other application fields of the present invention will become more obvious.It should be understood that these detailed descriptions and specific examples, although showing preferred embodiments of the present invention, are intended for illustrative purposes only and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The features and advantages of one or more embodiments of the present invention will become more readily understood through the following description with reference to the accompanying drawings, in which:

[0022] Figure 1 It is a partial longitudinal sectional view of a conventional scroll compressor;

[0023] Figure 2 for Figure 1 An enlarged detail view of section A in FIG, showing the axially flexible mounting mechanism;

[0024] Figure 3 is a partial longitudinal sectional view of a scroll compressor according to a first embodiment of the present disclosure, showing an axially flexible mounting mechanism;

[0025] Figure 4a and Figure 4b Schematic top and bottom perspective views of a backing plate portion in an axially flexible mounting mechanism of a scroll compressor according to a first embodiment of the present disclosure;

[0026] Figure 5 Schematic diagram of the force applied to the backing plate portion of the axially flexible mounting mechanism of the scroll compressor according to the first embodiment of the present disclosure;

[0027] Figure 6is a partial longitudinal sectional view of a scroll compressor according to a second embodiment of the present disclosure, showing an axially flexible mounting mechanism;

[0028] Figure 7a is a partial longitudinal sectional view of a scroll compressor according to a third embodiment of the present disclosure, showing an axially flexible mounting mechanism;

[0029] Figure 7b for Figure 7a An enlarged detail of part B in FIG;

[0030] Figure 8a and Figure 8b 1. A perspective view of a backing plate portion according to a modified example of the first embodiment of the present disclosure and a top view of a compression mechanism of a scroll compressor equipped with the backing plate portion;

[0031] Figure 9a and Figure 9b A partial longitudinal sectional view of a scroll compressor according to a fourth embodiment of the present disclosure and a perspective schematic view of bolts in an axially flexible mounting mechanism;

[0032] Figure 10a and Figure 10b A partial longitudinal sectional view of a scroll compressor according to a modified example of the fourth embodiment of the present disclosure and a perspective schematic view of bolts in an axially flexible mounting mechanism; and

[0033] Figure 11a 、 Figure 11b and Figure 11c Schematic diagrams of the stress conditions of the existing sleeve, bolt and axial flexible mounting mechanism during the operation of the compressor. DETAILED DESCRIPTION

[0034] Example embodiments will now be described more fully with reference to the accompanying drawings.

[0035] Exemplary embodiments are provided so that this disclosure will be exhaustive and will more fully convey the scope to those skilled in the art. Many specific details, such as examples of specific components, devices, and methods, are described to provide a thorough understanding of the various embodiments of the present disclosure. It will be clear to those skilled in the art that specific details need not be employed, and that the exemplary embodiments can be implemented in many different forms and should not be construed as limiting the scope of the present disclosure. In some exemplary embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.

[0036] Refer to the following Figure 1The overall structure of a scroll compressor 10 is described below. As shown, compressor 10 includes a compression mechanism, a motor, a rotating shaft (also called a drive shaft or crankshaft) 7, a main bearing housing 5, and a housing defining an interior space accommodating the compression mechanism. The housing comprises a generally cylindrical compressor body 1, a housing top cover, a muffler cover, and other components.

[0037] The compression mechanism includes a fixed scroll 2 and an orbiting scroll 3. The motor is configured to rotate a rotary shaft 7, which then drives the orbiting scroll 3 to orbit relative to the fixed scroll 2 (i.e., the central axis of the orbiting scroll moves around the central axis of the fixed scroll, but the orbiting scroll does not rotate about its central axis) to compress the working fluid.

[0038] The fixed scroll 2 can be fixed relative to the housing body 1 in any suitable manner, such as being fixedly mounted to the main bearing seat 5 by bolts as shown in the figure, which will be described in detail later. The fixed scroll 2 may include a fixed scroll end plate 22 and a fixed scroll blade 24 extending from one side of the fixed scroll end plate 22. Figure 2 As shown, the fixed scroll 2 further has a lug 26 extending radially outward from its radially outermost outer peripheral surface. A mounting hole is provided in the lug 26 for receiving an axially flexible mounting mechanism so as to be connected to the main bearing seat 5.

[0039] The orbiting scroll 3 may include an orbiting scroll end plate 32, orbiting scroll blades 34 formed on one side of the orbiting scroll end plate 32, and a hub 31 formed on the other side of the orbiting scroll end plate 32. The fixed scroll blades 24 and the orbiting scroll blades 34 can engage with each other, forming a series of compression chambers between the fixed scroll blades 24 and the orbiting scroll blades 34 when the scroll compressor is in operation, with the volume gradually decreasing from the radial outside to the radial inside, thereby compressing the working fluid. The hub 31 engages with the eccentric crank pin of the rotating shaft 4 and is driven by the eccentric crank.

[0040] The main bearing seat 5 is adapted to support the orbiting scroll end plate 32 of the orbiting scroll 3. The orbiting scroll end plate 32 revolves on a supporting surface of the main bearing seat 5. The main bearing seat 5 can be fixed relative to the casing body 1 of the scroll compressor 10 in any suitable manner.

[0041] In order to achieve fluid compression, effective sealing is required between the fixed scroll 2 and the movable scroll component 3.

[0042] On the one hand, when the scroll compressor is operating normally, radial sealing is also required between the side surfaces of the spiral blades 24 of the fixed scroll 2 and the side surfaces of the spiral blades 34 of the movable scroll 3. This radial sealing between the two is usually achieved by means of the centrifugal force of the movable scroll 3 during operation and the driving force provided by the rotating shaft 7. When incompressible foreign matter (such as solid impurities and liquid refrigerant) enters the compression chamber and gets stuck between the spiral blades 24 and 34, the spiral blades 24 and 34 can be temporarily separated from each other in the radial direction to allow the foreign matter to pass through, thereby preventing damage to the spiral blades 24 and 34, thereby providing radial flexibility for the scroll compressor 10.

[0043] On the other hand, when the scroll compressor is operating normally, axial sealing is required between the top of the spiral blade 24 of the fixed scroll 2 and the end plate 32 of the orbiting scroll 3, as well as between the top of the spiral blade 34 of the orbiting scroll 3 and the end plate 22 of the fixed scroll 2. When the pressure in the compression chamber of the scroll compressor is too high, the fluid in the compression chamber will leak to the low-pressure side through the gap between the top of the spiral blade 24 of the fixed scroll 2 and the end plate 32 of the orbiting scroll 3, as well as the gap between the top of the spiral blade 34 of the orbiting scroll 3 and the end plate 22 of the fixed scroll 2 to achieve unloading, thereby providing axial flexibility for the scroll compressor 10.

[0044] In order to provide axial flexibility, the fixed scroll 2 is mounted to the main bearing seat 5 through an axially flexible mounting mechanism. Figure 2 The main bearing seat 5 is provided with an axially extending boss 51 at its radially outermost side, and the boss 51 is axially aligned with the lug 26 of the corresponding fixed scroll 2. The axially flexible mounting mechanism includes a bolt 7 and a sleeve 9 located on the outer periphery of the bolt 7. A clearance fit is formed between the bolt 7 and the sleeve 9. The bolt 7 has a rod, a head 71 located at one end of the rod, and a threaded portion located at the other end of the rod. The threaded portion is configured to be screwed into the threaded hole of the boss 51 of the main bearing seat 5. The bolt 7 also has a stopper 72 formed by extending radially outward from the outer peripheral surface of the head 71. A clearance fit is formed between the lower surface of the stopper 72 and the upper surface 261 of the lug 26. The sleeve 9 is also received in the mounting hole of the lug 26 of the fixed scroll 2 and a clearance fit is formed between the lower end surface of the sleeve 9 and the upper surface of the boss 51. That is, the sleeve 9 is located between the stop portion 72 and the upper surface of the boss 51 of the main bearing seat 5, thereby defining the positions of the head 71 and the stop portion 72. A certain gap can be reserved between the lower surface of the stop portion 72 and the upper surface 261 of the lug 26, allowing the fixed scroll 2 to move a predetermined distance in the axial direction, thereby providing axial flexibility for the scroll compressor 10.

[0045] When the movable scroll 3 revolves relative to the fixed scroll 2, the centripetal acceleration causes the blades to contact the sides, generating a force F acting on the sleeve 9. 导 , the force F 导There is a risk of the sleeve 9 sliding. On the other hand, the force F 导 Applying load to the bolt 7 through the sleeve 9 may cause the bolt 7 to loosen or even break. The boss 51 of the main bearing seat 5 is also at risk of breaking due to being connected to the bolt 7.

[0046] The present disclosure aims to reduce the risk of slipping of the sleeve in the axially flexible mounting mechanism while reducing the risk of loosening or even breaking of the bolts, and aims to reduce the risk of cracking of the boss of the main bearing seat.

[0047] Figure 3 FIG1 shows a partial longitudinal cross-sectional view of a scroll compressor according to a first embodiment of the present invention. The scroll compressor includes a housing body 1, a fixed scroll 2, a main bearing seat 5, and an axially flexible mounting mechanism. The axially flexible mounting mechanism includes a bolt 17, a sleeve 19 located on the outer periphery of the bolt 17, and a pad portion 18 at least partially disposed axially between the head 171 of the bolt 17 and the sleeve 19. The structures of the housing body 1, the fixed scroll 2, the main bearing seat 5, the bolt 17, and the sleeve 19 are similar to those of the existing scroll compressor described above, and therefore will not be described in detail. Figure 4a and Figure 4b In the first embodiment, the backing plate portion 18 is constructed as a single integral annular member, and a plurality of bolts 17 (four are shown in the figure) share one backing plate portion 18. The backing plate portion 18 includes a plurality of body portions 181 and a plurality of flange portions 182 extending radially outward from the body portions 181. Holes 185 for the bolts 17 to pass through are provided on the body portion 181 at positions corresponding to the bolts and the mounting holes in the lugs 26 (in FIG. Figure 4a 、 4b (shown as four holes, corresponding to a total of four axially flexible mounting mechanisms for the scroll compressor), that is, the body portion 181 is arranged around the bolt 17, and the body portions 181 are interconnected by a connecting portion 188. The flange portion 182 extends radially outward from the body portion 181, and the flange portions 182 are also interconnected by the connecting portion 188. Each body portion 181 and each flange portion 182 are interconnected by the connecting portion 188 to form a single integral annular configuration. The extended end of the flange portion 182 has a radial outer side wall 184. In addition, the backing plate portion 18 also has a cylindrical portion 183 extending axially from the lower surface of the body portion 181 around the hole 185.

[0048] See also Figure 3When the backing plate 18 is installed in the axially flexible mounting mechanism, a clearance fit is formed between the upper surface of the main body 181 of the backing plate 18 and the lower surface of the stopper 142 extending radially outward from the outer periphery of the head 141 of the bolt 14. A clearance fit is also formed between the lower surface of the main body 181 of the backing plate 18 and the upper end surface of the sleeve 16. Those skilled in the art will understand that the clearance fit herein includes a situation where two surfaces can contact each other. The shank of the bolt 14 is inserted into the threaded hole of the main bearing seat 5 by sequentially passing through the hole 185 of the backing plate 18 and the sleeve 19. In addition, the cylindrical portion 183 of the pad portion 18 extends axially from the lower surface of the main body portion 181 toward the upper surface of the lug 26 of the fixed scroll 2 (i.e., the opposite surface that cooperates with the sleeve 19), and a certain gap can be reserved between the axial free end face 187 of the cylindrical portion 183 and the upper surface of the lug 26 (i.e., the axial gap between the axial free end face 187 and the fixed scroll 2), thereby providing a predetermined distance that the fixed scroll 2 can move in the axial direction. The cylindrical portion 183 surrounds a space 186 that accommodates a portion of the sleeve 16, and at least a portion of the sleeve 16 (including the portion of the upper end face) is inserted into the cylindrical portion 183. Figure 4a and Figure 4b As shown, the cylindrical portion 183 may not be a complete hollow cylinder, but may instead be a shape with a portion of the radially inner wall missing, thereby saving installation space. Furthermore, the radially outer wall 184 of the flange portion 182 is rigidly connected to the housing body 1, typically by radial engagement. In this disclosure, a rigid connection includes, but is not limited to, direct welding, zero-interference fit, or riveting to the housing body 1, or an indirect fixed connection to the housing body 1 via other components.

[0049] The following is through Figure 11a 、 Figure 11b and Figure 11c The stress conditions of the existing sleeve, bolts and axial flexible mounting mechanism shown in the figure during the operation of the compressor are compared to illustrate the changes in the stress conditions of the sleeve, bolts and axial flexible mounting mechanism according to the first embodiment of the present disclosure, thereby illustrating the effect of the present disclosure in reducing the sliding risk of the sleeve and the damage risk of the bolts and the main bearing seat.

[0050] See also Figure 11a When the movable scroll 3 revolves relative to the fixed scroll 2, a radial force F acting on the sleeve 9 is generated. 导 At the same time, the upper end surface of the sleeve 9 is subjected to the radial friction force F1 of the bolt 7, and the lower end surface of the sleeve 9 is subjected to the radial friction force F2 of the boss 51 of the main bearing seat 5. In addition, the sleeve 9 is subjected to a pair of preload forces F in the axial direction. 预 As the speed of the moving scroll 3 increases, the force F 导increases, which results in an increase in the friction forces F1 and F2, increasing the risk of the sleeve 9 slipping. Figure 11b The bolt 7 is subjected to the reverse friction force F1 exerted by the upper end surface of the sleeve 9. The increase of the friction force F1 will also lead to an increase in the bending moment M and stress at the end where the bolt 7 is connected to the boss 51, increasing the risk of fracture failure of the bolt 7. For the overall axial flexible mounting mechanism, see Figure 11c , the radial force F acting on the entire axial flexible mounting mechanism 导 This will cause bending moment M and stress to the boss 51 of the main bearing seat 5, which may cause the main bearing seat 5 to break. 导 The friction force F2 is usually mostly distributed to the lower end surface of the sleeve 9. Therefore, it is usually desirable to reduce the friction force F2 to reduce the risk of sliding of the sleeve 9. However, a reduction in the friction force F2 often leads to a corresponding increase in the friction force F1 borne by the upper end surface of the sleeve 9, which increases the risk of fracture and failure of the bolt 7. Therefore, designers often need to balance the risk of sliding of the sleeve 9 and the risk of fracture and failure of the bolt 7.

[0051] The present disclosure provides a pad portion 18 rigidly connected to the housing body 1 between the head 171 of the bolt 17 and the sleeve 19, which not only reduces the risk of the sleeve 9 sliding, but also reduces the risk of the bolt 7 and the main bearing seat 5 breaking and failing. Figure 5 The lower surface of the pad portion 18 (main body 181) is subjected to a reverse friction force F1 exerted by the upper end surface of the sleeve 19, but the reverse friction force F1 is balanced by the supporting force of the shell body 1 on the pad portion 18. Therefore, for the sleeve 19, the force F 导 The friction force F1 can be more distributed to the upper end surface of the sleeve 19, so that the friction force F2 on the lower end surface of the sleeve 19 is reduced, thereby reducing the risk of sliding of the sleeve 19. On the other hand, since the reverse friction force F1 of the sleeve 19 on the shim portion 18 is balanced by the supporting force of the shell body 1 on the shim portion 18, the shim portion 18 almost does not generate radial force on the bolt 17, so the bolt 17 is almost only subjected to the preload force F in the axial direction. 预 , the risk of fracture failure is also greatly reduced. For the axial flexible support mechanism as a whole, due to the radial force F acting on the axial flexible mounting mechanism as a whole, 导 It is largely balanced by the supporting force of the housing body 1 , so the bending moment M and stress on the boss 51 of the main bearing seat 5 are also greatly reduced.

[0052] Figure 6 FIG2 shows a partial longitudinal sectional view of a scroll compressor according to a second embodiment of the present invention. Figures 3 to 5Similar to the scroll compressor according to the first embodiment of the present invention shown in FIG, a scroll compressor according to the second embodiment of the present invention includes, among other things, a housing body 1, a fixed scroll 2, a main bearing seat 5, and an axially flexible mounting mechanism. The axially flexible mounting mechanism includes a bolt 27, a sleeve 29 positioned around the outer periphery of the bolt 27, and a backing plate portion 28 at least partially disposed between the bolt 27 and the sleeve 29. In the second embodiment, the structure and position of the fixed scroll 2, the main bearing seat 5, the bolt 27, and the sleeve 29 are similar to those of the scroll compressor according to the first embodiment described above, and therefore are not further described.

[0053] In the second embodiment, the backing plate 28 includes a body portion 281 and a flange portion 282. The body portion 281 is similar to the body portion 181 in the first embodiment and is provided with a hole for the bolt 27 to pass through. The flange portion 282 includes not only a radially extending portion 2821 extending radially outward, but also an axially extending portion 2822 extending axially in a direction away from the threaded portion of the bolt 27. The end of the axially extending portion 2822 is configured as a connecting end portion 2823 for rigid connection to the housing body 1. The connecting end portion 2823 can be as shown in FIG. Figure 6 , it is shown in the figure that it is axially engaged with the housing body 1, and it can also be radially engaged with the housing body 1. The radial extension portion 2821 of the main body portion 281 and the flange portion 282 is arranged between the head 271 of the bolt 27 and the sleeve 29. In addition, the backing plate portion 28 also has a cylindrical portion 283 extending axially from the lower surface of the main body portion 281 toward the upper surface of the lug 26 of the fixed scroll 2. A certain gap can be reserved between the free end surface 287 of the cylindrical portion 283 and the upper surface of the lug 26, thereby providing a predetermined distance that the fixed scroll 2 can move in the axial direction.

[0054] The second embodiment not only achieves similar effects as the first embodiment in reducing the risk of sleeve slippage and cracking of the bolts and main bearing seat, but is also particularly advantageous when the backing plate portion 28 is rigidly connected to the housing body 1 via welding. For example, in the first embodiment, the flange portion 182 of the backing plate portion 18 extends only radially from the main body portion 181 toward the housing body 1, with its radially outer wall 184 welded to the housing body 1. The weld point is very close to the bolt 17 and sleeve 19, which can easily cause thermal deformation of the bolt 17 and sleeve 19 during welding. In the second embodiment, the backing plate portion 28, by means of the axially extending portion 2822 of the flange portion 282, distances the connecting end 2823 from the bolt 27 and sleeve 29, reducing the impact of heat generated during welding of the connecting end 2823 and the housing body 1 on the bolt 27 and sleeve 29. Furthermore, since the connecting end 2823 is distanced from the bolt 27 and sleeve 29, more space is available for installation when the connecting end 2823 and the housing body 1 are joined using methods such as riveting.

[0055] Figure 7a and Figure 7b FIG2 shows a partial longitudinal sectional view of a scroll compressor according to a third embodiment of the present invention. Figures 3 to 5 Similar to the scroll compressor according to the first embodiment of the present invention shown in FIG, a scroll compressor according to the third embodiment of the present invention includes, among other things, a housing body 1, a fixed scroll 2, a main bearing seat 5, and an axially flexible mounting mechanism. The axially flexible mounting mechanism includes a bolt 37, a sleeve 39 positioned around the outer periphery of the bolt 37, and a backing plate portion 38 at least partially disposed between the bolt 37 and the sleeve 39. In the third embodiment, the structure and position of the fixed scroll 2, the main bearing seat 5, the bolt 37, and the sleeve 39 are similar to those of the scroll compressor according to the first embodiment described above, and therefore are not further described.

[0056] In the third embodiment, the gasket 38 includes a main body portion 381 and a flange portion 382. The main body portion 381, similar to the main body portion 181 in the first embodiment, is provided with a hole for the bolt 37 to pass through. The main body portion 381 and the flange portion 382 are disposed between the head 371 of the bolt 37 and the sleeve 39. The gasket portion 28 further includes a cylindrical portion 383 extending axially from the lower surface of the main body portion 381 toward the upper surface of the lug 26 of the fixed scroll 2. A certain gap can be reserved between the free end surface 387 of the cylindrical portion 383 and the upper surface of the lug 26, thereby defining a predetermined distance that the fixed scroll 2 can move in the axial direction. The flange portion 282 extends radially toward the housing body 1 and has a radial outer wall 384. Unlike the first embodiment, the radial outer wall 384 is not rigidly connected to the housing body 1, but instead forms a clearance fit with the housing body 1. It should be noted that the clearance fit here is a so-called small clearance fit, in particular, it means that there is a very small gap between the radial outer wall 384 and the shell body 1 or the radial outer wall 384 contacts the shell body 1 but no force is generated on the contact surface.

[0057] When the orbiting scroll 3 orbits relative to the fixed scroll 2, and the radial load on the sleeve 39 is small, the bolt 37 has only a small deformation, the pad portion 38 does not contact the housing body 1, and the housing body 1 does not generate a radial support force on the pad portion 38. Therefore, the pad portion 38 does not share the radial load borne by the sleeve 39. Of course, in this case, the risk of the sleeve 39 slipping and the risk of the bolt 37 and the main bearing seat 5 rupturing and failing are also relatively low. When the radial load on the sleeve 39 reaches a predetermined value, the risk of the sleeve 39 slipping and the risk of the bolt 37 and the main bearing seat 5 rupturing and failing is greater. The bolt 37 generates a large deformation, causing the pad portion 38 (radial outer wall 384) to contact the housing body 1. The housing body 1 generates a radial support force on the pad portion 38. Therefore, the pad portion 38 begins to participate in sharing the radial load borne by the sleeve 39, thereby reducing the risk of the sleeve 39 slipping and the risk of the bolt 37 and the main bearing seat 5 rupturing and failing.

[0058] Compared to the rigid connection of the backing plate to the housing body in the first and second embodiments, the clearance fit between the backing plate 38 and the housing body 1 in the third embodiment facilitates manufacturing and installation. While reducing the risk of sleeve slippage and the risk of bolt and main bearing seat cracking and failure, the third embodiment also simplifies manufacturing and installation processes, extending its applicability.

[0059] Figure 8a and Figure 8b FIG. 4 shows a pad portion 48 according to a modified example of the first embodiment of the present invention. Figure 4a and Figure 4b The single integral annular gasket portion 18 is shown in the figure, and the gasket portion 48 in the modified example is provided with multiple gasket portions 48. The number of gasket portions 48 is consistent with the number of axially flexible mounting mechanisms (bolts 47), and each bolt 47 is provided with a corresponding gasket portion 48. Each gasket portion 48 includes a main body portion 481 and a flange portion 482. The main body portion 481 is constructed in a circular ring shape around the bolt 47, and a hole 485 for the bolt 47 to pass through is provided on the main body portion 481. The flange portion 482 extends outward from the main body portion 481 to form a cantilever shape, and its extension direction can deviate from the radial direction. The extended end of the flange portion 482 has a radial outer side wall 484. The radial outer side wall 484 is rigidly connected to the housing body 1 or has a clearance fit. In addition, the gasket portion 48 also has a cylindrical portion 483 extending axially from the lower surface of the main body portion 481 around the hole 485 toward the upper surface of the lug 26 of the fixed scroll 2.

[0060] The pad portion 48 of this modified example is installed in a manner similar to the first embodiment, in which a clearance fit is formed between the bolt and the sleeve, and the distance of the fixed scroll axial movement can also be controlled by the reserved gap between the free end face of the cylindrical portion 483 and the upper surface of the lug of the main bearing seat. Compared with the single integral annular pad portion 18 in the first embodiment, the pad portion 48 of this modified example is easier to manufacture and install due to its split configuration, and has a wider range of applications. On the other hand, since the extension direction of the flange portion 482 of the pad portion 48 can deviate from the radial direction, the radial outer side wall 484 of the flange portion 482 for engaging with the housing body 1 can be away from the bolt and the sleeve to a certain extent, thereby reducing the effect of heat generated during welding on the bolt and the sleeve. Furthermore, during the installation of the gasket portion 48, the gasket portion 48 can be rotated to reach a desired position, such as a position suitable for welding the radial outer wall 484 and the shell body 1 or a position where the radial outer wall 484 and the shell body 1 form a zero interference fit, thereby reducing the precision requirements for the gasket portion 48, making production more convenient and applicable to more models of scroll compressors.

[0061] Figure 9a FIG. 2 shows a partial longitudinal sectional view of a scroll compressor according to a fourth embodiment of the present invention. Figures 3 to 5 Similar to the scroll compressor according to the first embodiment of the present invention shown in FIG, a scroll compressor according to the fourth embodiment of the present invention includes a housing body 1, a fixed scroll 2, a main bearing seat 5, and an axially flexible mounting mechanism, etc. The axially flexible mounting mechanism includes a bolt 57, a sleeve 59 located around the outer periphery of the bolt 57, and a backing plate portion 58 disposed between a head 571 of the bolt 57 and the sleeve 59. In the fourth embodiment, the structure and position of the fixed scroll 2, the main bearing seat 5, and the sleeve 59 are similar to those of the scroll compressor according to the first embodiment described above, and therefore are not described in detail.

[0062] See also Figure 9b In the fourth embodiment, the shim portion 58 is not a separate component, but is formed as a whole with the bolt 57. Specifically, the shim portion 58 is composed of a stopper portion 572 extending radially outward from the outer periphery of the head portion 571 of the bolt 57, and a cylindrical portion 583 extending axially from the lower surface of the stopper portion 572 toward the upper surface of the lug 26 of the fixed scroll 2. The stopper portion 572 has a radial outer side wall 584, which is rigidly connected to or clearance-fitted with the housing body 1. The free end face 587 of the cylindrical portion 583 forms a clearance fit with the upper end face of the sleeve 59, and a certain gap is reserved between it and the upper surface of the lug 26 of the fixed scroll 2 to provide a distance for the fixed scroll 2 to move axially.

[0063] Compared to the embodiment in which the backing plate and bolt are separate components, the fourth embodiment integrates the backing plate 58 with the bolt 57, thereby reducing the number of components and simplifying installation and maintenance. For existing scroll compressors, simply replacing the bolts can reduce the risk of sleeve slippage and bolt failure.

[0064] Figure 10a FIG2 is a partial longitudinal sectional view of a scroll compressor according to a modified example of the fourth embodiment of the present invention. Figure 10a Similar to the scroll compressor according to the fourth embodiment of the present invention shown in FIG, the scroll compressor according to this variation includes, among other things, a housing body 1, a fixed scroll 2, a main bearing seat 5, and an axially flexible mounting mechanism. The axially flexible mounting mechanism includes a bolt 67, a sleeve 69 positioned around the outer periphery of the bolt 67, and a backing plate portion 68 at least partially disposed between a head 671 of the bolt 67 and the sleeve 69. In this variation, the structure and position of the fixed scroll 2, the main bearing seat 5, and the sleeve 69 are similar to those of the scroll compressor according to the fourth embodiment described above, and therefore are not further described.

[0065] See also Figure 10b Similar to the fourth embodiment, the shim portion 68 is not a separate component, but is formed integrally with the bolt 67. Specifically, the shim portion 68 is composed of a stopper portion 672 extending radially outward from the outer periphery of the head portion 671 of the bolt 67 and a cylindrical portion 683 extending axially from the lower surface of the stopper portion 672 toward the upper surface of the lug 26 of the fixed scroll 2. The stopper portion 672 has a radial outer wall 684, which is rigidly connected to or has a clearance fit with the housing body 1. The cylindrical portion 683 is constructed as a hollow cylindrical portion to define a space for accommodating a portion of the sleeve 69. That is, a portion of the sleeve 69 (the portion with the upper end surface) is inserted into the interior of the cylindrical portion 683 and forms a clearance fit with the inner wall of the cylindrical portion 683. A certain gap is reserved between the free end surface 687 of the cylindrical portion 683 and the upper surface of the lug 26 of the fixed scroll 2 to provide a distance for the fixed scroll 2 to move axially.

[0066] Because a portion of sleeve 69 is inserted into cylindrical portion 683 and forms a clearance fit with cylindrical portion 683, this modification makes it easier to achieve alignment of the bolt and sleeve. In addition, when sleeve 69 is subjected to a radial load, the radial load can be more easily transferred to bolt 67 and balanced by the engagement of backing plate portion 68, which is integral with bolt 67, with housing body 1.

[0067] In the embodiment described above, by adding a gasket portion and rigidly connecting or loosely fitting the gasket portion to the housing body, the risk of sleeve sliding and the risk of bolt and main bearing seat rupture are reduced. However, those skilled in the art will appreciate that the gasket portion can also be rigidly connected or loosely fitted to other housing parts other than the housing body to achieve the same purpose, such as the housing top cover, silencer cover, etc. Those skilled in the art will also appreciate that the component for connecting the fixed scroll and the main bearing seat in the axially flexible mounting mechanism is not limited to a bolt, but can be a screw or any other fastener that can achieve a similar effect.

[0068] Through finite element simulation analysis of the existing scroll compressor and the scroll compressor in the first embodiment, it is found that when the sleeve is subjected to the same radial load, the design of the pad portion can effectively reduce the force that causes the sleeve to slide and the bending moment suffered by the axial flexible mechanism. Among them, in the scheme where the pad portion and the shell body are interference fit, the force that causes the sleeve to slide is reduced to 72% of the existing scheme without the pad portion design, and the bending moment suffered by the axial flexible mechanism is reduced to 30% of the existing scheme without the pad portion design; in the scheme where the pad portion and the shell body are welded, the force that causes the sleeve to slide is reduced to 82% of the existing scheme without the pad portion design, and the bending moment suffered by the axial flexible mechanism is reduced to 16% of the existing scheme without the pad portion design. Therefore, the scroll compressor according to the present disclosure can significantly improve the problems of sleeve sliding, bolt and main bearing seat rupture and failure.

[0069] Although the present invention has been described with reference to exemplary embodiments, it should be understood that the present invention is not limited to the specific embodiments described and illustrated in detail herein, and that those skilled in the art may make various changes to the exemplary embodiments without departing from the scope defined by the claims. It should also be understood that the features of the various embodiments may be combined or omitted without conflicting technical solutions.

Claims

1. A scroll compressor comprising: A compression mechanism, comprising a fixed scroll (2) and a movable scroll (3), wherein the movable scroll (3) is configured to be able to orbit relative to the fixed scroll (2) to compress a working fluid; a housing defining an interior space for accommodating the compression mechanism; a main bearing seat (5) fixed to the housing and supporting the movable scroll (3); and an axially flexible mounting mechanism, via which the fixed scroll is connected to the main bearing seat so that the fixed scroll can move a predetermined distance in the axial direction; The axially flexible mounting mechanism comprises: a fastener (17; 27; 37; 47; 57; 67) having a head (171; 271; 371; 571; 671); a sleeve (19; 29; 39; 59; 69) arranged on the outer periphery of the fastener; and a shim portion (18; 28; 38; 48; 58; 68) at least partially arranged axially between the head of the fastener and the sleeve, the shim portion being engageable with the housing so that the housing can provide radial support to the shim portion. The backing plate portion further includes a cylindrical portion (183; 283; 383; 483; 583; 683) extending axially toward the threaded portion of the fastener connected to the main bearing seat, and an axial free end surface (187; 287; 387; 587; 687) of the cylindrical portion and the fixed scroll have an axial gap to limit a predetermined distance that the fixed scroll moves in the axial direction. The backing plate portion includes a body portion (181; 281; 381; 481) and a flange portion (182; 282; 382; 482) extending outwardly from the radially outer side of the body portion, the body portion is provided with a hole for the fastener to pass through, and the flange portion is configured to be engageable with the housing. The flange portion is configured to extend radially outward from the body portion and has a radially outer sidewall (184; 384; 484; 584; 684) configured to radially engage the housing.

2. The scroll compressor according to claim 1, wherein: The shim portion (19; 29; 59; 69) is rigidly connected to the shell, or a clearance fit is formed between the shim portion (39; 59; 69) and the shell, so that the shim portion engages with the shell when the radial load on the sleeve reaches a predetermined value.

3. The scroll compressor according to claim 2, wherein: The rigid connection includes direct welding, zero interference fit or riveting with the housing, or includes indirect fixed connection with the housing through other components.

4. The scroll compressor according to claim 1, wherein The flange portion (282) is constructed to include a radially extending portion (2821) and an axially extending portion (2822), wherein the radially extending portion extends radially outward from the body portion (281), and the axially extending portion extends axially from the radially extending portion in a direction away from the threaded portion of the fastener connected to the main bearing seat, and the end of the axially extending portion has a connecting end portion (2823), and the connecting end portion (2823) is constructed to be able to be axially or radially engaged with the housing.

5. The scroll compressor according to claim 1, wherein: The plurality of fasteners share one backing plate portion (18), which is constructed as a single integral annular member in which the plurality of body portions (181) and the plurality of flange portions (182) are connected to each other by a connecting portion (188).

6. The scroll compressor according to claim 1, wherein: Each of the plurality of fasteners is correspondingly provided with a backing plate portion (48), and the backing plate portion (48) includes a body portion (481) and a flange portion (482).

7. The scroll compressor according to claim 6, characterized in that The flange portion (482) of each of the backing plate portions (48) extends outward from the body portion (483) in a direction that deviates from the radial direction.

8. The scroll compressor according to any one of claims 1 to 7, characterized in that: The backing plate portion and the fastener are formed as one body or as separate bodies. In the case where the backing plate portion and the fastener are formed as separate bodies, the main body portion of the backing plate portion forms a clearance fit with the fastener.

9. The scroll compressor according to claim 1, wherein: The cylindrical portion is a hollow cylindrical portion so as to define a space for accommodating at least a portion of the sleeve.

10. The scroll compressor according to claim 9, wherein: The cylindrical portion of the backing plate portion forms a clearance fit with the sleeve.

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