scroll compressor

Abstract

A scroll compressor includes: a housing, a scroll mechanism and a main bearing seat, the scroll mechanism includes a fixed scroll, the fixed scroll includes an end plate, a scroll extending from the end plate and an outer peripheral wall, the outer peripheral wall is arranged on the periphery of the scroll, and the main bearing seat supports the scroll mechanism, wherein the scroll compressor also includes a retaining mechanism and a positioning pin, the retaining mechanism is arranged around the outer peripheral wall to limit the radial movement of the fixed scroll, the positioning pin is connected to the first mounting hole of the retaining mechanism and the second mounting hole of the main bearing seat and is axially arranged between the retaining mechanism and the main bearing seat, thereby determining the axial position of the retaining mechanism relative to the main bearing seat. According to the present invention, the processing of the retaining mechanism and the main bearing seat of the scroll compressor is simpler, the material is more economical, and the installation difficulty of the retaining mechanism and the main bearing seat is lower.

Description

Technical Field

[0001] The present invention relates to a scroll compressor, and more particularly to a retaining mechanism for a fixed scroll. Background Art

[0002] A scroll compressor generally consists of a housing, a drive mechanism housed within the housing, a scroll mechanism driven by the drive mechanism, and a main bearing housing supporting the scroll mechanism. The scroll mechanism typically comprises an orbiting scroll and a fixed scroll that mesh with each other. The fixed scroll is positioned within the compressor by a retaining mechanism. This retaining mechanism, while limiting scroll movement within radial limits and ensuring radial centering of the fixed scroll, also allows for axial movement of the fixed scroll within a certain range, thus providing a certain degree of axial flexibility for the scroll compressor.

[0003] A commonly used method for retaining the fixed scroll in the prior art involves providing a lug on the outer periphery of the fixed scroll with a through-hole formed in the lug, and forming a threaded hole in the arm portion of the main bearing seat. The fixed scroll and the main bearing seat are secured together using bolts with guide sleeves, thereby achieving radial centering of the fixed scroll. Because the through-hole formed in the lug of the fixed scroll can slide axially along the guide sleeve, the fixed scroll is allowed to move slightly axially relative to the main bearing seat.

[0004] Another commonly used method for retaining the fixed scroll in the prior art involves placing a guide ring around the outer periphery of the fixed scroll. The guide ring has a through hole, through which bolts are passed and screwed into threaded holes in the main bearing seat. The guide ring radially limits the fixed scroll and allows it to move axially within a certain range.

[0005] However, of the two methods of retaining the fixed scroll, the first method requires machining lugs and through holes on the fixed scroll and using a guide sleeve and bolts, which increases the radial size of the fixed scroll and increases assembly cost and time. The second method requires machining structural features on the guide ring that match the fixed component (such as the main bearing seat) to achieve radial centering of the guide ring, which also increases the processing difficulty and processing cost of the compressor. Therefore, there is a need to improve the method of retaining the fixed scroll component. Summary of the Invention

[0006] The purpose of the present invention is to provide a scroll compressor with a new fixed scroll retaining mechanism, which can not only achieve radial limitation of the fixed scroll and allow the fixed scroll to move axially within a certain range relative to the main bearing seat, but also is simple to process, easy to install, and saves materials.

[0007] According to one aspect of the present invention, a scroll compressor is provided, which includes: a shell, a scroll mechanism and a main bearing seat, the scroll mechanism includes a fixed scroll, the fixed scroll includes an end plate, a scroll extending from the end plate and a peripheral wall, the peripheral wall is arranged on the periphery of the scroll, and the main bearing seat supports the scroll mechanism, wherein the scroll compressor also includes a retaining mechanism and a positioning pin, the retaining mechanism is arranged around the peripheral wall to limit the radial movement of the fixed scroll, the positioning pin is connected to the first mounting hole of the retaining mechanism and the second mounting hole of the main bearing seat and is axially arranged between the retaining mechanism and the main bearing seat, thereby determining the axial position of the retaining mechanism relative to the main bearing seat.

[0008] Optionally, the retaining mechanism includes a guide ring, which cooperates with the radial clearance of the outer peripheral wall to guide the axial movement of the fixed scroll.

[0009] Optionally, the retaining mechanism further includes a silencer cover that separates the internal space of the scroll compressor into a low-pressure zone and a high-pressure zone, and the guide ring and the silencer cover are formed separately.

[0010] Optionally, the silencer cover is connected to the guide ring by interference fit or by fasteners, thereby fixing the guide ring between the positioning pin and the silencer cover.

[0011] Optionally, the silencer cover is clearance-matched with the guide ring, and the guide ring and / or the silencer cover includes an outer flange portion extending radially outward, and the outer flange portion is fixedly connected to the shell.

[0012] Optionally, the shell includes a shell body and a top cover, and: the outer flange portion of the guide ring is fixedly connected axially between the shell body and the top cover; or the outer flange portion of the guide ring and the outer flange portion of the silencer cover are fixedly connected axially between the shell body and the top cover.

[0013] Optionally, the guide ring or silencer cover includes an inner flange portion extending radially inward, an abutment portion is formed at the fixed vortex, and there is a predetermined distance in the axial direction between the inner flange portion and the abutment portion, so that the fixed vortex can move axially within a range defined by the predetermined distance.

[0014] Optionally, the retaining mechanism also includes a silencer cover that separates the internal space of the scroll compressor into a low-pressure zone and a high-pressure zone. The retaining mechanism is formed integrally by a guide ring and the silencer cover. The retaining mechanism includes an outer flange portion extending radially outward and an inner flange portion extending radially inward. The outer flange portion is fixedly connected to the shell, and the inner flange portion and the abutment portion of the fixed scroll are at a predetermined distance in the axial direction, so that the fixed scroll can move axially within the range defined by the predetermined distance.

[0015] Optionally, the housing includes a housing body and a top cover, and the outer flange portion of the retaining mechanism is fixedly connected between the housing body and the top cover in the axial direction.

[0016] Optionally, the locating pins are at least three locating pins distributed along the circumferential direction.

[0017] Optionally, the locating pin is constructed as a step pin having a first step portion and / or a second step portion, the first step portion abuts against the end face of the retaining mechanism provided with the first mounting hole, and the second step portion abuts against the end face of the main bearing seat provided with the second mounting hole.

[0018] Optionally, the step pin is an integrally formed one-piece pin, or the step pin is a split pin including a pin body and a sleeve sleeved on the pin body.

[0019] According to the scroll compressor of the present invention, its fixed scroll achieves radial centering and axial flexibility through a retaining mechanism, and the retaining mechanism is connected to the main bearing seat through a positioning pin and achieves its radial centering and axial positioning, thereby avoiding the processing of the matching parts of the retaining mechanism and the main bearing seat caused by direct cooperation between the retaining mechanism and the main bearing seat, saving materials and reducing the difficulty of processing and installation; the retaining mechanism can be formed as an integral part, thereby simplifying the installation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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. The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. The drawings are not drawn to scale, and some features may be exaggerated or minimized to show details of particular components. In the drawings:

[0021] Figure 1 is a partial longitudinal sectional view of a scroll compressor according to a first exemplary embodiment of the present invention;

[0022] Figure 2 is a perspective schematic diagram of a portion of a scroll compressor according to a first exemplary embodiment of the present invention;

[0023] Figure 3 is a cross-sectional view showing a cross section of a scroll mechanism of a scroll compressor according to a first exemplary embodiment of the present invention;

[0024] Figure 4 is an exploded perspective view of a portion of a scroll compressor according to a first exemplary embodiment of the present invention;

[0025] Figure 5 is a partial detailed longitudinal sectional view of a scroll compressor according to a first exemplary embodiment of the present invention, showing a retaining mechanism of the scroll compressor;

[0026] Figure 6 is a perspective schematic diagram of a stepped pin according to a first exemplary embodiment of the present invention;

[0027] Figure 7a 、 Figure 7b and Figure 7c A perspective schematic diagram of a step pin and its components according to a second exemplary embodiment of the present invention is shown respectively;

[0028] Figure 8 is a partial longitudinal sectional view of a scroll compressor according to a third exemplary embodiment of the present invention;

[0029] Figure 9 is a partial longitudinal sectional view of a scroll compressor according to a fourth exemplary embodiment of the present invention;

[0030] Figure 10 is a partial longitudinal sectional view of a scroll compressor according to a fifth exemplary embodiment of the present invention;

[0031] Figure 11 is a partial longitudinal sectional view of a scroll compressor according to a comparative example of the present invention; and

[0032] Figure 12 and Figure 13 3D schematic diagrams of a main bearing seat and a guide ring of a scroll compressor according to a comparative example of the present invention. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. The description is merely illustrative and does not constitute a limitation to the present invention and its applications.

[0034] Figure 1 FIG is a partial longitudinal sectional view of a scroll compressor according to a first exemplary embodiment of the present invention. Figure 1As shown, the scroll compressor 10 mainly includes a housing 20, a scroll mechanism, a main bearing seat 50 and a driving mechanism (not shown). The housing 20 generally includes a housing body 26, a top cover 22 and a bottom cover (not shown) in a roughly cylindrical shape. The housing body 26, the top cover (top cover) 22 and the bottom cover are formed into a complete housing 20 by, for example, welding. The scroll compressor 20 is also provided with a silencer cover 24 located between the housing body 26 and the top cover 22, thereby separating the internal space of the compressor into a low-pressure area 14 and a high-pressure area 12. The working fluid enters the low-pressure area 12 through the air intake fitting 29 provided on the housing body 26, enters the high-pressure area 12 after being compressed by the scroll mechanism, and is discharged to the outside of the scroll compressor 10 through the exhaust fitting 28 provided on the top cover 22. The scroll mechanism includes a fixed scroll 30 and a movable scroll 40. The scroll mechanism is driven by the driving mechanism. Specifically, when the drive shaft of the drive mechanism rotates, the orbiting scroll 40 can be driven via the crank pin of the drive shaft, and due to the cross ring 80 connecting the orbiting scroll 40 and the fixed scroll 30, the orbiting scroll 40 can rotate in a translational motion relative to the fixed scroll 30. In other words, the axis of the orbiting scroll 40 orbits along a circular orbit relative to the axis of the fixed scroll 30, but the orbiting scroll 40 and the fixed scroll 30 themselves do not rotate about their respective axes. The scroll mechanism is supported by the main bearing seat 50, which is fixedly connected to the housing body 26 by means such as riveting or is formed integrally with the housing body 26.

[0035] The fixed scroll 30 includes an end plate 31 and a spiral scroll 32 extending downward from one side of the end plate 31. The scroll 32 of the fixed scroll 30 and the scroll 42 of the movable scroll 40 mesh with each other, thereby forming a series of compression chambers for compressing a fluid, such as a refrigerant, therebetween. The fixed scroll 30 also includes a generally cylindrical outer peripheral wall 33 extending downward from the end plate 31 and disposed on the outer periphery of the scroll 32 of the fixed scroll 30. The fixed scroll 30 is positioned in the scroll compressor 10 by a retaining mechanism. The retaining mechanism may include a guide ring 60. See Figure 2 and Figure 3 , the guide ring 60 is arranged around the outer peripheral wall 33 of the fixed scroll 30, the lower end of the guide ring 60 is connected to the main bearing seat 50 by a locating pin 70, and the upper end of the guide ring 60 is limited by the silencer cover 24. The main bearing seat 50 includes a base and three boss portions 52 extending from one side of the base toward the guide ring 60 (upward), and the three boss portions 52 are distributed circumferentially on the main bearing seat 50. The locating pin 70 is axially arranged between the guide ring 30 and the boss portion 52 of the main bearing seat 50, one end of which is fixed in the boss portion 52, and the other end is connected to the guide ring 60, thereby determining the axial position of the guide ring 60 relative to the main bearing seat 50. It can be understood by those skilled in the art that the number of boss portions 52 and locating pins 70 is not limited to the three shown in the figure, and can also be more than three.

[0036] Refer to the following Figure 4and Figure 5 The guide ring 60 is described in detail. Figure 4 and Figure 5 As shown, the guide ring 60 includes a generally annular ring body 61, an inner flange portion 68 extending radially inward from the inner sidewall of the ring body 61, and an upper flange portion 64 extending axially upward from the upper end surface of the ring body 61. The guide ring 60 also has a first mounting hole 66 formed on the lower end surface of the ring body 61 at a position corresponding to the locating pin 70. A second mounting hole 54 for receiving the locating pin 70 is formed in the boss portion 52 of the main bearing seat 50. The second mounting hole 54 is axially aligned with the first mounting hole 66. One end of the locating pin 70 is inserted into the first mounting hole 66 of the guide ring 60, and the other end is inserted into the second mounting hole 54 of the main bearing seat 50, thereby connecting the guide ring 60 to the main bearing seat 50. Because the boss portion 52 and the second mounting hole 54 of the main bearing seat 50 are distributed circumferentially, the guide ring 60, positioned by the locating pin 70, can be installed radially centered. Those skilled in the art will appreciate that the main bearing seat 50 may not include the boss portion 52 , but instead the locating pin 70 may be directly connected to the main bearing seat 50 .

[0037] See also Figure 6 The positioning pin 70 is constructed as a stepped pin having a stepped portion 74. The positioning pin 70 includes a first diameter portion 71, a second diameter portion 72, and a third diameter portion 73. The diameters of the second diameter portion 72 and the third diameter portion 73 are both smaller than the diameter of the first diameter portion 71. The second diameter portion 72 and the third diameter portion 73 are respectively formed at both ends of the positioning pin 70, while the first diameter portion 72 is formed in the middle section of the positioning pin 70, so that a first step portion 74 and a second step portion 75 are formed at the connection between the second diameter portion 72 and the first diameter portion 71 and at the connection between the third diameter portion 73 and the first diameter portion 71, respectively. Figure 5The second diameter portion 72 mates with the first mounting hole 66 of the guide ring 60, and the third diameter portion 73 mates with the second mounting hole 54 of the main bearing housing 60. When the second and third diameter portions 72, 73 at each end of the locating pin 70 are inserted into the axially aligned first and second mounting holes 66, 54, respectively, the first step portion 74 abuts against the lower end surface of the ring body 61 of the guide ring 60, where the first mounting hole 66 is located, and the second step portion 75 abuts against the upper end surface of the boss portion 52 of the main bearing housing 50, where the second mounting hole 54 is located. The axial position of the guide ring 60 relative to the main bearing housing 50 is thereby determined by the locating pin 70. The axial distance between the lower end surface of the ring body 61 of the guide ring 60 and the upper end surface of the boss portion 52 of the main bearing housing 50 can be equal to the axial length of the first diameter portion 71 of the locating pin 70. The second and third diameter portions 72, 73 can be constructed with smooth surfaces, and the first and second mounting holes 66, 54 can be correspondingly constructed as smooth blind holes. Preferably, the third diameter portion 73 may be configured with an external thread, and the second mounting hole 54 may be configured as a threaded hole matching the third diameter portion 73 , thereby further strengthening the connection between the locating pin 70 and the main bearing seat.

[0038] By constructing the locating pin as a stepped pin with two stepped portions, the axial distance of the guide ring relative to the main bearing seat depends only on the length of the first diameter portion of the stepped pin and is not related to the total length of the pin or the depth of the mounting hole, thereby enabling the axial position of the guide ring to be determined more accurately and simply.

[0039] Furthermore, those skilled in the art will appreciate that, although the locating pin 70 is configured as a stepped pin with two steps in the first exemplary embodiment, the locating pin 70 may alternatively have only one step or no step. In this case, the axial position of the guide ring relative to the main bearing seat can be determined by the length of the locating pin and the depth of the first and second mounting holes capable of accommodating the locating pin.

[0040] The upper end of the guide ring 60 can be axially limited by the muffler cover 24. Figure 5The upper flange portion 64 of the guide ring 60 can form an interference fit or a clearance fit with the muffler cover 24, thereby maintaining the guide ring 60 in an axially fixed position between the first step portion 74 of the locating pin 70 and the muffler cover 24. To more stably and reliably secure the guide ring 60 within the housing, the guide ring 60 further includes an outer flange portion 62 extending radially outward from the outer sidewall of the ring body 1. The outer flange portion 62 is inserted into the gap A between the housing body 26 and the top cover 22 to securely connect the housing body 26 and the top cover 22 in the axial direction. For example, the guide ring 60 can be welded to the housing via the outer flange portion 62 during welding of the housing. In addition, the silencer cover 24 may also be formed with an outer flange portion extending outward to the gap A so as to be fixedly connected between the shell body 26 and the top cover 22 together with the outer flange portion 62 of the guide ring 60. For example, when welding the shell, the guide ring 60, the silencer cover 24, the shell body 26 and the top cover 22 may be welded and fixed together, thereby further simplifying the processing process and saving processing materials.

[0041] Since the guide ring 60 is limited in the radial and axial directions by the positioning pin 70, the guide ring 60 can be fixed in the compressor housing in a radially centered manner and at a required axial height. Therefore, the guide ring 60 can achieve radial centering of the fixed scroll 30. In addition, when the fixed scroll 30 needs to have axial flexibility, the guide ring 60 can also achieve axial limitation of the fixed scroll 40. Specifically, see Figure 5 The inner sidewall of the ring body 61 of the guide ring 60 forms a clearance fit with the outer peripheral wall 33 of the fixed scroll 30, thereby radially centering the fixed scroll 30 and limiting its radial movement (making it virtually impossible for the fixed scroll 30 to move radially). Furthermore, the inner sidewall of the ring body 61 serves as a guide surface to guide the axial movement of the fixed scroll 30. A third step 34 (abutment portion) is also formed on the outer peripheral wall 33 of the fixed scroll 30. A certain gap (a predetermined axial distance) is formed between the lower surface of the inner flange 68 of the guide ring 60 and the upper surface of this third step 34, thereby allowing the fixed scroll 30 to move axially within a predetermined range defined by this predetermined distance. Since the axial position of the guide ring 60 is determined by the positioning pin 70, the size of the gap between the lower surface of the inner flange 68 of the guide ring 60 and the upper surface of the third step 34, i.e., the range of axial movement of the fixed scroll 30, is also indirectly determined by the positioning pin 70. That is, when the dimensions of other components are determined, the axial motion range of the fixed scroll 30 can be determined by determining the dimensions of the positioning pin 70, especially the axial length of the first diameter section 71. In addition, those skilled in the art will also understand that the inner sidewall of the inner flange portion 68 of the guide ring 60 can also form a clearance fit with the outer peripheral wall 33 of the fixed scroll 30, thereby helping to achieve radial centering of the fixed scroll 30 and limiting the radial movement of the fixed scroll 30.

[0042] The following will refer to Figures 11 to 13 The effects of the present invention will be described using a scroll compressor 10a in a comparative example shown in FIG. Figure 11 、 Figure 12 、 Figure 13 As shown in the comparative example, the fixed scroll 30a of the scroll compressor 10a is held in place in the housing by a guide ring 60a. The guide ring 60a includes a generally annular ring body 61a and a lower flange portion 68a extending axially downward from the ring body 61a. The inner sidewall of the ring body 61a forms a clearance fit with the outer peripheral wall 33a of the fixed scroll 30a, thereby achieving radial centering of the fixed scroll 30a and guiding the axial movement of the fixed scroll 30a. A certain gap is formed between the free end face 65a of the lower flange portion 68a and the upper surface of the third step portion 34a of the outer peripheral wall 33a of the fixed scroll 30a, thereby allowing the fixed scroll 30a to move axially within a certain range.

[0043] The radial centering and axial limiting of the guide ring 60a are achieved by cooperating with the main bearing seat 50a. Figure 12 The main bearing seat 50a includes a base and a plurality of arms 52a (four in the example shown) extending from one side of the base toward the guide ring 60a (upward). The plurality of arms 52a are distributed circumferentially on the main bearing seat 50a. The arm 52a includes an inner surface 56a and an upper surface 57a. When the guide ring 60a is installed in the main bearing seat 50a, on the one hand, the inner surface 56a of the arm 52a forms a clearance fit with the outer surface 63a of the lower flange portion 68a of the guide ring 60a, thereby radially centering the guide ring 60a and limiting radial movement of the guide ring 60a. On the other hand, the upper surface 57a of the arm 52a abuts against the lower surface 69a of the ring body 61a of the guide ring 60a, thereby determining the axial position of the guide ring 60a. Finally, the pilot ring 60a is fixedly connected to the main bearing housing 50a by inserting fasteners (not shown) into the mounting holes 67a of the pilot ring 60a and the mounting holes 59a on the arm portion 52a of the main bearing housing 50a.

[0044] In this comparative example, in order to achieve radial centering and axial positioning of the guide ring 60a, matching structural features need to be machined on the guide ring 60a and the main bearing seat 50a, such as the arm portion 52a including the inner surface 56a, the upper surface 57a, and the mounting hole 59a, and the lower flange portion 68a including the outer surface 63a. Therefore, the structures of both the guide ring 60a and the main bearing 50a are relatively complex, which is not only difficult to machine and install, but also consumes more materials and leads to increased costs. In contrast, in the present invention, the guide ring 60 achieves radial centering and determines the axial position of the guide ring 60 through multiple (more than three) locating pins 70, without the need to machine matching structural features on the guide ring and the main bearing seat. As a universal part, the locating pins 70 are easier to produce and install. Therefore, the retaining mechanism for the fixed scroll proposed by the present invention is easier to produce and assemble, uses more materials, and also has good reliability. In addition, the present invention can also be produced using existing production modules, thus having good applicability.

[0045] Figure 7a 、 Figure 7b and Figure 7c A positioning pin 70' according to a second exemplary embodiment of the present invention is shown. In the second exemplary embodiment of the present invention, the scroll compressor has substantially the same main structure and function as the scroll compressor 10 of the first exemplary embodiment, and therefore will not be described in detail. The difference is that the scroll positioning pin 70' is constructed as a stepped pin formed by assembling a pin body 701 and a sleeve 702 sleeved on the pin body 701. Specifically, the pin body 701 passes through a through hole in the sleeve 702, so that the sleeve 702 is located in the middle section of the pin body 701, thereby forming a first diameter portion 71' of the stepped pin. The two sections of the pin body 701 located outside the sleeve 702 respectively form the second diameter portion 72' and the third diameter portion 73' of the stepped pin. A clearance fit or interference fit is formed between the pin body 701 and the sleeve 702, thereby forming a first step portion 74' between the first diameter portion 71' and the second diameter portion 72', and a second step portion 75' between the first diameter portion 71' and the third diameter portion 73'.

[0046] According to the second exemplary embodiment, since the positioning pin 70 ′ is assembled by the pin body 701 and the sleeve 702 , compared with an integrally formed stepped pin, the processing difficulty is further reduced and the processing process is simplified.

[0047] Figure 8FIG2 is a partial longitudinal cross-sectional view of a scroll compressor 110 according to a third exemplary embodiment of the present invention. The main structure and functions of this scroll compressor 110 are substantially identical to those of the scroll compressor 10 according to the first exemplary embodiment, and therefore will not be described in detail. The difference is that the retaining mechanism of scroll compressor 110 includes not only a guide ring but also a muffler cover, and the guide ring and muffler cover are integrally formed, thereby forming a muffler cover 160 that functions as a guide ring. Muffler cover 160 includes a generally annular ring body 161 and a cover-like portion 124 positioned above ring body 161. Muffler cover 160 also includes an inner flange portion 168 extending radially inward from the inner sidewall of ring body 161 and an outer flange portion 162 extending radially outward from the outer sidewall of ring body 161. A first mounting hole 166 is provided at the lower end of ring body 161 of muffler cover 160 for accommodating the second diameter portion 72 of locating pin 70, thereby connecting muffler cover 160 to the main bearing housing 50 via locating pin 70. The outer flange 162 of the muffler cover 160 is inserted into the welding gap A between the casing body 26 and the top cover 22, thereby securing the muffler cover 160 to the casing during welding. On the one hand, a clearance fit is formed between the inner sidewall of the ring body 161 of the muffler cover 160 and the outer peripheral wall 33 of the fixed scroll 30, thereby radially centering the fixed scroll 30 and limiting its radial movement. The inner sidewall of the ring body 161 also serves as a guide surface for axial movement of the fixed scroll 30. On the other hand, a certain clearance is formed between the inner flange 168 of the muffler cover 160 and the third step 34 of the outer peripheral wall 33 of the fixed scroll 30, allowing the fixed scroll 30 to move axially within a certain range. Furthermore, the cover-shaped portion 124 of the muffler cover 160 is positioned between the casing body 26 and the top cover 22 to separate the compressor interior into a low-pressure zone and a high-pressure zone 12.

[0048] According to the third exemplary embodiment, since the retaining mechanism is configured as a silencer cover having a guide ring function, compared with separate guide rings and silencer covers, the number of parts is further reduced, the installation process is simplified, and the installation accuracy is improved.

[0049] Figure 9 2 is a partial longitudinal sectional view of a scroll compressor 210 according to a fourth exemplary embodiment of the present invention. The scroll compressor 210 is substantially identical in structure and function to the scroll compressor 10 according to the first exemplary embodiment, and therefore will not be described in detail. The difference is that the retaining mechanism of the scroll compressor 210 includes a guide ring 260 and a muffler cover 224, wherein the guide ring 260 is no longer fixed to the housing (e.g., Figure 5The guide ring 260 is not welded to the housing by the outer flange portion 62 of the guide ring 260 shown in the figure, but is fixed in its axial position only by the silencer cover 224. Specifically, the guide ring 260 includes a generally annular ring body 261 and an inner flange portion 268 extending radially inward from the inner side wall of the ring body 261. A certain gap is formed between the inner flange portion 268 and the third step portion 34 of the outer peripheral wall 33 of the fixed scroll 30, thereby allowing the fixed scroll 30 to move axially within a certain range. On the one hand, the lower end of the ring body 261 of the guide ring 260 is provided with a first mounting hole 266 for accommodating the second diameter portion 72 of the locating pin 70, so that the guide ring 260 is connected to the main bearing seat 50 via the locating pin 70. On the other hand, a fourth step 265 is formed at the upper end of the ring body 261 of the guide ring 260. The peripheral edge 225 of the muffler cover 224 abuts against this fourth step 265, forming an interference fit with the guide ring 260, thereby securing the guide ring 260 in the axial direction. Furthermore, the muffler cover 224 has an outer flange 262 extending radially outward from its outer sidewall. The outer flange 262 is inserted into the welding gap A between the housing body 26 and the top cover 22. During welding of the housing, the muffler cover 224 is secured to the housing via the outer flange 262. Thus, the guide ring 260 is clamped between the muffler cover 224 and the locating pin 70, specifically between the peripheral edge 225 of the muffler cover 224 and the second step 74 of the locating pin 70, thereby being held securely in the housing.

[0050] According to the fourth exemplary embodiment, since the guide ring is fixed in the housing only by the silencer cover and the positioning pin, it is no longer necessary to provide an outer flange portion for welding fixation on the guide ring, thereby further simplifying the processing and assembly process and reducing the difficulty of production.

[0051] Figure 10: is a partial longitudinal sectional view of a scroll compressor 310 according to a fourth exemplary embodiment of the present invention. The scroll compressor 310 is basically consistent with the main structure and function of the scroll compressor 210 of the third exemplary embodiment, so they are not repeated here. The difference is that the guide ring 260 in the retaining mechanism of the scroll compressor 310 is only used to achieve radial centering of the fixed scroll 30, while the axial limitation of the fixed scroll 30 is achieved by the silencer cover 324. Specifically, the guide ring 360 is formed into a roughly annular shape. The lower end of the guide ring 360 is provided with a first mounting hole 366 for accommodating the second diameter portion 72 of the locating pin 70, so that the guide ring 360 is connected to the main bearing seat 50 through the locating pin 70. The upper end of the guide ring 360 is interference-connected with the peripheral portion 325 of the silencer cover 324 or connected by a fastener such as a bolt, thereby limiting the guide ring 360 in the axial direction. As a result, the guide ring 360 is clamped between the silencer cover 324 and the positioning pin 70, specifically between the peripheral edge 325 of the silencer cover 324 and the second step 74 of the positioning pin 70, thereby being held fixed in the housing. The inner sidewall of the guide ring 360 forms a clearance fit with the outer peripheral wall 33 of the fixed scroll 30, thereby achieving radial centering of the fixed scroll 30 and limiting radial movement of the fixed scroll 30 (making the fixed scroll 30 almost unable to move radially). In addition, the inner sidewall of the guide ring 360 can also serve as a guide surface to guide the axial movement of the fixed scroll 30.

[0052] The muffler cover 324 includes an outer flange portion 362 extending radially outward from its outer sidewall and an inner flange portion 368 extending radially inward from its inner sidewall. The outer flange portion 362 is inserted into the welding gap A between the housing body 26 and the top cover 22, thereby securing the muffler cover 324 to the housing via the outer flange portion 362 during welding. A certain gap is formed between the inner flange portion 368 and the third step portion 34 of the outer peripheral wall 33 of the fixed scroll 30, thereby allowing the fixed scroll 30 to move axially within a certain range.

[0053] In the fifth exemplary embodiment, similar to the fourth exemplary embodiment, the guide ring is secured to the housing solely by the muffler cover and the locating pins, further simplifying the processing and assembly process and reducing production complexity. Furthermore, since the guide ring has only a simple annular structure, existing production modules can be directly utilized, resulting in greater applicability and lower production costs.

[0054] Those skilled in the art will appreciate that the present invention allows for a variety of axial limiting methods to control the axial position of the guide ring and fix the guide ring in the housing, and is not limited to the specific methods described in the exemplary embodiments of the present invention.

[0055] Although various embodiments of the present invention have been described in detail herein, it should be understood that the present invention is not limited to the specific embodiments described and illustrated herein, and that other modifications and variations may be implemented by those skilled in the art without departing from the spirit and scope of the present invention. All such modifications and variations are intended to fall within the scope of the present invention. Furthermore, all components described herein may be replaced by other technically equivalent components.

Claims

1. A scroll compressor (10, 110, 210, 310), comprising: Housing (20); A scroll mechanism, the scroll mechanism comprising a fixed scroll (30), the fixed scroll (30) comprising: an end plate (31), a scroll (32) extending from the end plate (31), and an outer peripheral wall (33), the outer peripheral wall (33) being arranged on the outer periphery of the scroll (32); and a main bearing seat (50), the main bearing seat (50) supporting the scroll mechanism; It is characterized in that the scroll compressor also includes a retaining mechanism and a positioning pin (70, 70'), the retaining mechanism is arranged around the outer peripheral wall (33) to limit the radial movement of the fixed scroll (30), and the positioning pin (70, 70') is connected to the first mounting hole (66, 166, 266, 366) of the retaining mechanism and the second mounting hole (54) of the main bearing seat (50) and is axially arranged between the retaining mechanism and the main bearing seat (50), thereby determining the axial position of the retaining mechanism relative to the main bearing seat (50).

2. The scroll compressor (10, 110, 210, 310) according to claim 1, characterized in that The retaining mechanism comprises a guide ring (60, 260, 360), and the guide ring (60, 260, 360) is matched with the outer peripheral wall (33) in a radial clearance to guide the axial movement of the fixed scroll (30).

3. The scroll compressor (10, 110, 210, 310) according to claim 2, characterized in that The retaining mechanism further comprises a silencer cover (24, 224, 324) which divides the inner space of the scroll compressor into a low-pressure zone and a high-pressure zone, and the guide ring is formed separately from the silencer cover.

4. The scroll compressor (10, 110, 210, 310) according to claim 3, characterized in that The silencer cover is connected to the guide ring by interference fit or by fasteners, thereby fixing the guide ring between the positioning pin and the silencer cover.

5. The scroll compressor (10, 110, 210, 310) according to claim 3, characterized in that The muffler cover is loosely matched with the guide ring; the guide ring and / or the muffler cover comprises an outer flange portion (62, 262, 362) extending radially outward; the outer flange portion is fixedly connected to the housing (20).

6. The scroll compressor (10, 110, 210, 310) according to claim 5, characterized in that The housing comprises a housing body (26) and a top cover (22), and: The outer flange portion of the guide ring is fixedly connected between the housing body (26) and the top cover (22) in the axial direction; or The outer flange portion of the guide ring and the outer flange portion of the silencer cover are fixedly connected in the axial direction between the housing body (26) and the top cover (22).

7. The scroll compressor (10, 110, 210, 310) according to claim 3, characterized in that The guide ring or the silencer cover includes an inner flange portion (68, 268, 368) extending radially inward, an abutment portion (34) is formed at the fixed vortex (30), and a predetermined distance exists between the inner flange portion (68, 268, 368) and the abutment portion (34) in the axial direction, so that the fixed vortex can move axially within a range defined by the predetermined distance.

8. The scroll compressor (10, 110, 210, 310) according to claim 2, characterized in that The retaining mechanism also includes a silencer cover (160) that separates the internal space of the scroll compressor into a low-pressure zone and a high-pressure zone. The retaining mechanism is formed integrally by the guide ring and the silencer cover. The retaining mechanism includes an outer flange portion (162) extending radially outward and an inner flange portion (168) extending radially inward. The outer flange portion is fixedly connected to the housing (20). There is a predetermined distance in the axial direction between the inner flange portion and the abutment portion (34) of the fixed scroll (30), so that the fixed scroll can move axially within the range defined by the predetermined distance.

9. The scroll compressor (10, 110, 210, 310) according to claim 8, characterized in that The housing includes a housing body (26) and a top cover (22), and the outer flange portion (162) of the retaining mechanism is fixedly connected between the housing body (26) and the top cover (22) in the axial direction.

10. The scroll compressor (10, 110, 210, 310) according to any one of claims 1 to 9, characterized in that: The positioning pins (70, 70') are at least three positioning pins distributed along the circumferential direction.

11. The scroll compressor (10, 110, 210, 310) according to any one of claims 1 to 9, characterized in that: The positioning pin (70, 70') is constructed as a stepped pin having a first step portion (74, 74') and / or a second step portion (75, 75'), the first step portion (74, 74') abutting against the end surface of the retaining mechanism provided with the first mounting hole (66, 166, 266, 366), and the second step portion (75, 75') abutting against the end surface of the main bearing seat provided with the second mounting hole (54).

12. The scroll compressor (10, 110, 210, 310) according to claim 11, characterized in that The step pin (70) is an integrally formed one-piece pin, or the step pin (70') is a split pin comprising a pin body (701) and a sleeve (702) sleeved on the pin body (701).

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