Scroll compressor and method for assembling fixed scroll of scroll compressor

Abstract

The present invention relates to a scroll compressor and an assembly method of a fixed scroll of the scroll compressor. In one aspect, a scroll compressor is provided, the scroll compressor comprising: a scroll mechanism, the scroll mechanism comprising a fixed scroll, the fixed scroll comprising a fixed scroll end plate and a fixed scroll vortex extending from one side of the fixed scroll end plate and an outer peripheral wall, the outer peripheral wall being arranged on the outer periphery of the fixed scroll vortex; and a main bearing seat, the main bearing seat is suitable for supporting the scroll mechanism and comprises a main body and an axial seat extending axially from the main body, and a circumferential annular groove is formed at the inner peripheral surface of the axial seat. The scroll compressor also includes an elastic ring arranged between the outer peripheral wall and the axial seat and a thrust structure suitable for forcing the elastic ring to expand radially outward, so that a portion of the elastic ring in the radial direction is inserted in the circumferential annular groove to limit the axial movement of the fixed scroll leaving the main bearing seat. In another aspect, an assembly method of a fixed scroll of a scroll compressor is provided.

Description

Technical Field

[0001] The present invention relates to a scroll compressor and also to an assembly method of a fixed scroll of the scroll compressor. Background Art

[0002] A scroll compressor generally includes a housing, a driving mechanism contained in the housing, a scroll mechanism driven by the driving mechanism, a main bearing seat supporting the scroll mechanism, etc. The scroll mechanism generally includes a movable scroll and a fixed scroll that mesh with each other. On the one hand, the fixed scroll needs to be fixed in the circumferential direction relative to the main bearing seat to prevent the fixed scroll from rotating around its axis. On the other hand, the fixed scroll needs to be able to move slightly axially along its axis, thereby providing a certain axial flexibility for the scroll mechanism.

[0003] In the prior art, the fixed scroll is mostly fixed to the main bearing seat by means of a lug extending from the body of the fixed scroll, in conjunction with a guide sleeve and fasteners (screws). This installation method limits the axial and circumferential movement of the fixed scroll while allowing the axial flexibility of the fixed scroll, but it often requires a larger radial assembly space. Increasing the displacement of the scroll is generally achieved by increasing the radial size of the scroll without changing the overall height of the compressor. Therefore, the conventional method of installing the fixed scroll by means of a lug in conjunction with a guide sleeve and fasteners is not conducive to increasing the displacement of the scroll and is not conducive to the miniaturization of the compressor.

[0004] In addition, there is also a method of axially limiting the fixed scroll by a guide ring or a floating ring in the prior art. The guide ring is arranged above the fixed scroll and fixed to the main bearing seat with fasteners, thereby limiting the axial movement of the fixed scroll. The circumferential movement of the fixed scroll can be limited by other features. This installation method still requires the use of fasteners to cooperate with the guide ring, has certain requirements on the strength of the guide ring and the fastener, still requires a certain radial assembly space, and the installation process is more difficult and time-consuming.

[0005] Therefore, there is a need to improve the installation method of the fixed scroll, so as to make the installation of the fixed scroll easier and achieve the purpose of increasing the displacement of the scroll without increasing the size of the compressor. Summary of the invention

[0006] The object of the present invention is to solve or at least alleviate at least one of the above-mentioned problems, that is, to provide a scroll compressor and a method for assembling a fixed scroll of a scroll compressor, the scroll compressor and the scroll compressor assembled by the assembly method can achieve radial centering and axial flexibility of its fixed scroll, the installation process is simpler, and the radial space design inside the compressor can be fully optimized, so that the displacement of the scroll compressor can be further increased without increasing its size.

[0007] According to one aspect of the present invention, a scroll compressor is provided, which includes: a scroll mechanism, the scroll mechanism includes a fixed scroll, the fixed scroll includes a fixed scroll end plate and a fixed scroll vortex extending from one side of the fixed scroll end plate and an outer peripheral wall, the outer peripheral wall is arranged on the outer periphery of the fixed scroll vortex; and a main bearing seat, the main bearing seat is suitable for supporting the scroll mechanism and includes a main body and an axial seat portion extending axially from the main body, and a circumferential annular groove is formed at the inner peripheral surface of the axial seat portion. The scroll compressor also includes an elastic ring arranged between the outer peripheral wall and the axial seat portion and a push structure suitable for forcing the elastic ring to expand radially outward, so that a portion of the elastic ring in the radial direction is inserted in the circumferential annular groove to limit the axial movement of the fixed scroll away from the main bearing seat.

[0008] Optionally, the outer peripheral wall includes a first wall portion and a second wall portion along the axial direction, a step portion is provided between the first wall portion and the second wall portion, and the elastic ring is arranged on the step portion.

[0009] Optionally, the pushing structure includes a mounting hole provided at the step portion and an expansion pin installed in the mounting hole and suitable for pushing the elastic ring radially outward.

[0010] Optionally, a cutting portion is provided at a position of the first wall portion corresponding to the mounting hole.

[0011] Optionally, the main bearing seat includes a first seat portion and a second seat portion along the axial direction, the first seat portion is provided with a circumferential annular groove and is arranged opposite to the first wall portion, the second seat portion is arranged opposite to the second wall portion, and the inner circumferential surface of the second seat portion cooperates with the outer circumferential surface of the second wall portion to limit the radial movement of the fixed vortex relative to the main bearing seat.

[0012] Optionally, the outer diameter of the elastic ring in a free state is smaller than the inner diameter of the first seat portion, and the inner diameter of the elastic ring is larger than the outer diameter of the first wall portion.

[0013] Optionally, the expansion pin is constructed as a hollow spring pin with longitudinal openings and openings at both ends, a cylindrical locating pin with external threads, or a locating pin with a head at one end and a flat portion extending in the axial direction of the expansion pin.

[0014] Optionally, the elastic ring is configured as a circular ring having an opening.

[0015] Optionally, a radial dimension of a portion of the elastic ring located in the circumferential annular groove is greater than 1 / 2 of a radial depth of the circumferential annular groove.

[0016] Optionally, the axial thickness of the elastic ring is smaller than the axial height of the circumferential ring groove.

[0017] Optionally, the elastic ring is configured to be not fixed to the fixed scroll or the main bearing seat, thereby being able to float in the axial direction with the axial movement of the fixed scroll.

[0018] Optionally, the outer circumferential surface of the outer circumferential wall and the inner circumferential surface of the axial seat are respectively formed with a first semicircular groove and a second semicircular groove, the first semicircular groove and the second semicircular groove cooperate to form a circular hole groove, and an anti-rotation pin accommodated in the circular hole groove is provided, thereby limiting the circumferential movement of the fixed vortex relative to the main bearing seat.

[0019] According to another aspect of the present invention, there is also provided an assembly method for a fixed scroll of a scroll compressor as described above, the assembly method comprising: arranging the fixed scroll into a main bearing seat; arranging an elastic ring on a step portion provided at the outer peripheral wall of the fixed scroll; and inserting an expansion pin of a thrust structure from the radial inner side of the elastic ring into a mounting hole of the thrust structure provided at the step portion, so that the elastic ring expands radially outward and a portion of the elastic ring in the radial direction is inserted into a circumferential annular groove formed at the inner peripheral surface of the axial seat portion of the main bearing seat.

[0020] Optionally, when the fixed vortex is arranged in the main bearing seat, a first semicircular groove formed on the outer circumferential surface of the outer circumferential wall is aligned with a second semicircular groove formed on the inner circumferential surface of the axial seat portion to form a circular hole groove, and the assembly method also includes inserting an anti-rotation pin into the circular hole groove.

[0021] Optionally, the step of inserting the expansion pin into the mounting hole from the radial inner side of the elastic ring includes: after the first expansion pin is inserted into the mounting hole, using a tool to expand the elastic ring radially outward, and removing the tool after the remaining expansion pins are all inserted into the corresponding mounting holes.

[0022] According to the present invention, radial centering and axial flexibility of the fixed scroll can be reliably achieved, the installation process is simpler, and the radial space design inside the compressor can be fully optimized, so that the displacement of the scroll compressor can be further increased without increasing its size. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The features and advantages of one or more embodiments of the present invention will become more easily 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, but some features may be enlarged or reduced to show details of specific components. In the drawings:

[0024] Figure 1 is an exploded perspective schematic diagram of a scroll mechanism and a main bearing seat according to an exemplary embodiment of the present invention;

[0025] Figure 2 is a schematic 3D assembly diagram of a scroll mechanism and a main bearing seat according to an exemplary embodiment of the present invention;

[0026] Figure 3 is a longitudinal sectional view of a scroll mechanism and a main bearing seat according to an exemplary embodiment of the present invention;

[0027] Figure 4a is a perspective schematic diagram of a fixed scroll according to an exemplary embodiment of the present invention;

[0028] Figure 4b is a longitudinal sectional view of a fixed scroll according to an exemplary embodiment of the present invention;

[0029] Figure 4c is a top view of a fixed scroll according to an exemplary embodiment of the present invention;

[0030] Figure 5a is a perspective schematic diagram of a main bearing housing according to an exemplary embodiment of the present invention;

[0031] Figure 5b is a longitudinal sectional view of a main bearing housing according to an exemplary embodiment of the present invention;

[0032] Figure 5c yes Figure 5b An enlarged detail view of part A shown in FIG.

[0033] Figure 6a and Figure 6b They are respectively a three-dimensional schematic diagram of an elastic ring according to an exemplary embodiment of the present invention and a comparison diagram before and after deformation;

[0034] Figure 7a and Figure 7b The expansion pins according to the exemplary embodiment and the modified examples thereof of the present invention are respectively shown;

[0035] Figure 8a , Figure 8b and Figure 8c shows a process of installing an elastic ring in place via an expansion pin according to an exemplary embodiment of the present invention; and

[0036] Figure 9a and Figure 9b They are respectively a schematic three-dimensional assembly diagram and a top view of a scroll mechanism and a main bearing seat according to an exemplary embodiment of the present invention, in which a circumferential limiting structure is shown. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. The description is merely exemplary and does not constitute a limitation to the present invention and its application.

[0038] See also Figure 1The scroll compressor mainly includes a housing (not shown), a scroll mechanism, a main bearing seat 4 and a driving mechanism (not shown). The scroll mechanism includes a fixed scroll 2 and a movable scroll 3. The driving mechanism is configured to drive the movable scroll 3 to orbit relative to the fixed scroll 2 (i.e., the central axis of the movable scroll moves around the central axis of the fixed scroll, but the movable scroll does not rotate around its central axis) to compress the working fluid.

[0039] The fixed scroll 2 can be fixed relative to the housing in any suitable manner, such as being mounted to the main bearing seat 4 as shown in the present invention, which will be described in detail later. Figure 3 As shown, the fixed scroll 2 may include a fixed scroll end plate 21 and a fixed scroll blade 22 (ie, a fixed scroll wrap) extending from one side of the fixed scroll end plate 21 .

[0040] The movable scroll 3 may include a movable scroll end plate 31 and a movable scroll blade 32 (i.e., a movable scroll wrap) formed on one side of the movable scroll end plate 31. The fixed scroll blade 22 and the movable scroll blade 32 can be engaged with each other, so that when the scroll compressor is running, a series of moving compression chambers with a volume gradually decreasing from the radial outer side to the radial inner side are formed between the fixed scroll blade 22 and the movable scroll blade 32, thereby achieving compression of the working fluid.

[0041] The main bearing seat 4 is suitable for supporting the movable scroll end plate 31 of the movable scroll 3. The movable scroll end plate 31 revolves on the supporting surface of the main bearing seat 4. The main bearing seat 4 can be fixed relative to the housing of the scroll compressor in any suitable manner.

[0042] In order to achieve fluid compression, effective sealing is required between the fixed scroll 2 and the movable scroll 3.

[0043] On the one hand, when the scroll compressor is operating normally, radial sealing is required between the side surface of the fixed scroll blade 22 and the side surface of the movable scroll blade 32. 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 driving device. When incompressible foreign matter (such as solid impurities and liquid refrigerant) enters the compression chamber and gets stuck between the scroll blades 22 and 32, the scroll blades 22 and 32 can be temporarily separated from each other in the radial direction to allow the foreign matter to pass, thereby preventing damage to the scroll blades 22 and 32, thereby providing radial flexibility for the scroll compressor.

[0044] On the other hand, when the scroll compressor is operating normally, axial sealing is required between the top of the fixed scroll blade 22 and the end plate 31 of the movable scroll 3, and between the top of the movable scroll blade 32 and the end plate 21 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 fixed scroll blade 22 and the movable scroll end plate 31, and the gap between the top of the movable scroll blade 32 and the fixed scroll end plate 21 to achieve unloading, thereby providing axial flexibility for the scroll compressor.

[0045] In order to provide axial flexibility, an exemplary embodiment of the present invention provides a structure for retaining the fixed scroll 2 in the main bearing seat 4 by means of an elastic ring 6. Figure 1 , Figure 2 and Figure 3 The main bearing seat 4 includes a main body portion 48 extending in the radial direction, and a thrust surface is formed on the main body portion 48 to support the movable scroll end plate 31. The main bearing seat 4 also includes a substantially cylindrical axial seat portion 49 extending axially upward from the main body portion 48, and the axial seat portion 49 constitutes a space for accommodating the movable scroll 3 and the fixed scroll 2. A circumferential annular groove 46 is formed at the inner circumferential surface of the axial seat portion 49 to accommodate a portion of the elastic ring 6.

[0046] The fixed scroll 2 includes a substantially cylindrical outer peripheral wall 23 extending from one side of the fixed scroll end plate 21 and arranged on the outer periphery of the fixed scroll blade 22 (i.e., the scroll of the fixed scroll), the outer peripheral wall 23 includes a first step portion 233 extending in the radial direction (corresponding to the step portion 233 according to the present invention), and the elastic ring 6 is arranged between the outer peripheral wall 23 and the axial seat portion 49 and arranged on the first step portion 233. The first step portion 233 is also provided with mounting holes 28 distributed in the circumferential direction for cooperating with the expansion pin 8. The mounting hole 28 is configured as a blind hole, and together with the expansion pin 8, it constitutes a push structure for forcing the elastic ring 6 to expand radially outward. By inserting the expansion pin 8 into the mounting hole 28, the expansion pin 8 pushes the elastic ring 6 radially outward from the radial inner side of the elastic ring 6, forcing the elastic ring 6 to expand outward in the radial direction, so that a portion of the elastic ring 6 in the radial direction remains in the circumferential annular groove 46 to limit the axial movement of the fixed scroll 2 away from the main bearing seat 4.

[0047] A clearance fit is formed between the circumferential annular groove 46 and the elastic ring 6 in the axial direction, which means that the elastic ring 6 can be freely inserted into the circumferential annular groove 46 . At the same time, after the elastic ring 6 is in place in the circumferential annular groove 46 , it can move axially within a predetermined range relative to the circumferential annular groove 46 , thereby realizing axial floating of the fixed scroll 2 .

[0048] Exemplary embodiments of the present invention use an elastic ring 6 cooperating with a circumferential ring groove 46 to axially limit the stationary scroll 2. Since conventional structures such as lugs are omitted, the radial space inside the compressor can be saved, which is beneficial to increasing the displacement of the scroll without increasing the overall size of the compressor. Although there is an expansion pin 8 in this exemplary embodiment, the expansion pin 8 is not a conventional fastener for fixedly connecting the stationary scroll or the floating ring to the main bearing seat. Its function is to make the elastic ring 6 expand radially. Therefore, the strength requirement for the expansion pin 8 is small, the radial installation space occupied by it can be reduced, and the installation is more convenient. On the other hand, the elastic ring 6 is configured not to be fixed to the stationary scroll 2 or the main bearing seat 4, so that it can float axially along with the axial movement of the stationary scroll 2, further omitting fasteners, making the axial flexible structure according to the present invention simpler and easier to install.

[0049] The following separately describes the components related to the axial floating of the stationary scroll of the present invention, including the main bearing seat 4, the stationary scroll 2, the elastic ring 6, the expansion pin 8, etc.

[0050] The following will refer to Figure 4a 、 Figure 4b and Figure 4c to describe the specific structure of the stationary scroll 2. The outer peripheral wall 23 of the stationary scroll 2 includes a first wall portion 231 and a second wall portion 232 in the axial direction. The outer diameter D21 of the outer side of the first wall portion 231 is smaller than the outer diameter of the second wall portion 232, thereby forming a first stepped portion 233 between the first wall portion 231 and the second wall portion 232. The first stepped portion 233 can be configured such that its radially outermost surface is flush with the radially outermost surface of the second wall portion 232, or as shown in Figure 4b , the first stepped portion 233 protrudes radially outward compared to the second wall portion 232, so as to provide more support for the elastic ring 6. Two or more mounting holes 28 are formed on the first stepped portion 233 and are distributed circumferentially. The diameter of the circle where the mounting holes 28 are located is D23. The mounting holes 28 are configured as blind holes for mounting the expansion pin 8. Preferably, at a position corresponding to the mounting holes 28 in the circumferential direction, a cutting portion 25 is formed on the first wall portion 231. The cutting portion 25 can be formed by axially cutting the radially outer side surface of the first wall portion 231, so that the distance L22 from the axis of the stationary scroll 2 to the plane where the cutting portion 25 is located is less than half of the outer diameter D21 of the first wall portion 231. The setting of the cutting portion 25 can reserve more design space for the mounting holes 28 and the expansion pin 8, and also facilitate the assembly of the expansion pin 8. The outer peripheral surface of the second wall portion 232 forms a stationary scroll positioning surface F2, and the stationary scroll positioning surface F2 is configured as a whole circular cylindrical surface, so as to cooperate with the bearing seat positioning surface F1 of the main bearing seat 4 (which will be described in detail below) to ensure the radially centered installation of the stationary scroll 2 (that is, it can limit or prevent the radial movement of the stationary scroll relative to the main bearing seat).

[0051] See also Figure 5a , Figure 5b and Figure 5c The specific structure of the main bearing seat 4 is shown, and the axial seat portion 49 of the main bearing seat 4 includes a first seat portion 41 opposite to the first wall portion 231 and provided with a circumferential annular groove 46, and a second seat portion 42 opposite to the second wall portion 232. The inner circumferential surface of the second seat portion 42 is formed with a bearing seat positioning surface F1, and the bearing seat positioning surface F1 is configured as a full-circle cylindrical surface, which can cooperate with the fixed vortex positioning surface F2 as described above to achieve radial centering and radial limiting of the fixed vortex. The fixed vortex positioning surface F2 and the bearing seat positioning surface F1 are configured as a small clearance fit. It should be noted that the small clearance fit here refers to the outer diameter of the second wall portion 232 formed with the fixed vortex positioning surface F2 being slightly smaller than the inner diameter of the second seat portion 42 formed with the bearing seat positioning surface F1, so that the second wall portion 232 of the fixed vortex 2 can be freely inserted into the second seat portion 42 of the main bearing seat 4 along the axial direction, and at the same time, after the insertion, the radial movement of the fixed vortex 2 relative to the main bearing seat 4 is limited or substantially limited.

[0052] In addition, the second seat portion 42 may also be formed with a second step portion 421, which is arranged adjacent to the circumferential annular groove 46 and below the circumferential annular groove 46, so as to support and / or accommodate the first step portion 233 of the fixed scroll 2, especially when the first step portion 233 protrudes radially outward compared to the fixed scroll positioning surface F2 to provide more support for the elastic ring 6. It can be understood by those skilled in the art that the axial thickness of the elastic ring 6 is less than the axial height H13 of the circumferential annular groove 46, so that the elastic ring 6 can be freely inserted into the circumferential annular groove 46 and can move axially to a certain extent relative to the main bearing seat 4 after the elastic ring 6 is inserted into the circumferential annular groove 46, thereby realizing the axial floating of the fixed scroll 2.

[0053] In addition, those skilled in the art will appreciate that, although in the exemplary embodiment of the present invention the axial seat portion 49 of the main bearing seat 4 is shown as being substantially cylindrical, the axial seat portion 49 may also be constructed in other suitable forms, such as in the form of a plurality of arms extending axially upward from the main body portion 48, and accordingly, the circumferential annular groove 46 includes a partial circumferential annular groove formed on the radial inner side walls of the plurality of arms for accommodating the elastic ring 6.

[0054] Figure 6aIt is a three-dimensional schematic diagram of the elastic ring 6. In the present invention, the elastic ring 6 is constructed as a circular ring with an opening 61, which itself can be a flat shape with a certain axial thickness, with an inner diameter D31 and an outer diameter D32. In other words, the two end faces of the elastic ring 6 in the axial direction can be constructed as planes, so as to be suitable for cooperating with the first step portion 233 and the circumferential annular groove 46, and it is easy to control the amount of axial floating more accurately. The elastic ring 6 can be made of spring steel that has a certain elasticity. With the design of the opening 61, the elastic ring 6 can expand or contract and deform under the action of radial external forces, while ensuring that it has a certain rigidity and can be used to cooperate with the circumferential annular groove 46 for axial limitation. For example, Figure 6b As shown, the shaded portion represents the elastic ring 6 in a free state. Under the action of radial external force, the elastic ring 6 expands and deforms to reach the state represented by the unshaded portion, that is, the outer contour size of the elastic ring 6 increases, and the width G33 of the opening 61 also increases. Of course, the elastic ring 6 can also shrink under the action of external force, so that the elastic ring 6 can be removed from the circumferential ring groove 46, which is convenient for the disassembly, reinstallation and replacement of components of the compressor.

[0055] Figure 7a It is a three-dimensional schematic diagram of the expansion pin 8. The expansion pin 8 is constructed as a hollow spring pin with openings at both ends, and its outer contour is constructed as a roughly cylindrical shape with a diameter of D41, which is used to cooperate with the mounting hole 28 on the fixed scroll 2. It can be understood by those skilled in the art that the number of expansion pins 8 can correspond to the number of mounting holes 28, specifically at least two. The outer diameter D41 of the expansion pin 8 is equal to or slightly larger than the diameter of the mounting hole 28, so that the expansion pin 8 is interference fit in the mounting hole 28. Preferably, the expansion pin 8 also has a longitudinal opening 81, so that the expansion pin itself has a certain elasticity and can be easily inserted into the mounting hole 28 to form an interference fit. Preferably, the two ends of the expansion pin 8 can also be formed into a tapered shape, which makes it easier for the expansion pin 8 to be inserted into the mounting hole 28. When the expansion pin 8 is inserted into the mounting hole 28, a part of the expansion pin 8 is accommodated in the mounting hole 28, and the other part is located outside the mounting hole 28 and above the first step portion 233, so as to apply a force in the radial direction to the elastic ring 6.

[0056] in addition, Figure 7bAn expansion pin 8' in a modified example is shown. The expansion pin 8' includes a head 8'1 and a rod 8'2, and the head 8'1 is formed with a plane portion 8'3 extending in the axial direction of the expansion pin 8'. The plane portion 8'3 is configured to be suitable for cooperating with the cutting portion 25 of the first wall portion 231 of the fixed scroll 2. When the expansion pin 8' is inserted into the mounting hole 28, the plane portion 8'3 can be made opposite to the cutting portion 25, so that the expansion pin 8' is easier to align with the mounting hole 28, easier to assemble and insert, and the expansion pin 8' is more stable. After the expansion pin 8' is assembled into the mounting hole 28, a part of its rod 8'2 is accommodated in the mounting hole 28 and has an interference fit with the mounting hole 28, while the remaining part of its rod 8'2 and the head 8'1 are located outside the mounting hole 28 and above the first step portion 233, and the rod 8'2 abuts against the radial inner wall of the elastic ring 6, exerting a force in the radial direction on the elastic ring 6.

[0057] It will be appreciated by those skilled in the art that the expansion pin may be formed not only as a spring pin having a smooth cylindrical outer profile to be interference fit with the mounting hole 28 (eg, Figure 7a As shown), it can also be formed as a cylindrical locating pin or a locating pin (not shown) with an external thread, and an internal thread matching the external thread on the surface of the expansion pin is formed on the inner surface of the mounting hole 28, so that the expansion pin can be assembled into the mounting hole 28 by screwing, making the installation process easier.

[0058] In addition, in the present invention, the push structure is not limited to including the mounting hole 28 and the expansion pin as described in the exemplary embodiment, and may also include any other structure capable of forcing the elastic ring 6 to expand radially outward and maintain the expanded state. For example, the push structure may include a protrusion structure formed integrally with the fixed scroll, and the protrusion structure can apply a radially outward force to the elastic ring 6 to expand the elastic ring 6 and maintain it in the circumferential annular groove 46.

[0059] In an exemplary embodiment of the present invention, in order to achieve the circumferential limitation of the fixed scroll 2, see Figure 9a and Figure 9b, a first semicircular groove 91 can be provided on the radial outer side of the outer peripheral wall 23 of the fixed scroll 2, and the first semicircular groove 91 can be formed on the radial outer side of the first step portion 233. In addition, a second semicircular groove 92 is provided on the radial inner side of the axial seat portion 49 of the main bearing seat 4, and the second semicircular groove 92 can be provided on the radial inner side of the second step portion 421. The first semicircular groove 91 and the second semicircular groove 91 can cooperate to form a complete circular hole groove 9. By inserting the anti-rotation pin into the circular hole groove 9, the fixed scroll 2 can be prevented from rotating relative to the main bearing seat 4 (that is, the circumferential movement of the fixed scroll 2 relative to the main bearing seat 4 can be limited or prevented). It should be noted that in order to avoid interference with the elastic ring 6 when installing the anti-rotation pin, the circular hole groove 9 is provided at a position corresponding to the opening 61 of the elastic ring 6. This circumferential limiting structure not only occupies a small radial space, but also has a simple structure and is easy to process and assemble.

[0060] Refer to the following Figure 8a , Figure 8b and Figure 8c A method of assembling the fixed scroll 2 according to an exemplary embodiment of the present invention will be described.

[0061] First, the fixed vortex 2 is axially slid into the main bearing seat 4 to form a small gap between the second wall portion 232 of the fixed vortex 2 and the second seat portion 42 of the main bearing seat 4, thereby achieving radial centering of the fixed vortex 2, and the first semicircular groove 91 needs to be aligned with the second semicircular groove 92 to form a complete circular hole groove 9.

[0062] Secondly, the elastic ring 6 is placed downward from the top of the fixed scroll 2 onto the first step portion 233 of the fixed scroll 2. It can be understood by those skilled in the art that the inner diameter D31 of the elastic ring 6 is larger than the outer diameter D21 of the first wall portion of the fixed scroll 2, and the outer diameter D32 of the elastic ring 6 is smaller than the inner diameter D11 of the first seat portion 41 of the main bearing seat 4, so that it can be ensured that the elastic ring 6 will not interfere with the fixed scroll 2 and the main bearing seat 4 when assembling the elastic ring, so that the elastic ring 6 can be easily placed from top to bottom to an appropriate position.

[0063] Then, after the elastic ring 6 is placed on the first step portion 233 and the elastic ring 6 is radially centered, a plurality of expansion pins 8 are sequentially inserted into the corresponding mounting holes 28 from the radial inner side of the elastic ring 6. Figure 8bWhen installing the first expansion pin 8, the elastic ring 6 is in a free state, and the mounting hole 28 (or expansion pin 8) partially overlaps with the elastic ring 6 in the radial direction, and the radial length of the overlapping part is the first dimension G1; after the first expansion pin 8 is inserted into the mounting hole 28, the expansion pin 8 abuts against the radial inner wall of the elastic ring 6 and applies a radially outward force to the elastic ring 6 so that the elastic ring 6 moves radially outward into the circumferential annular groove 46 of the main bearing seat 4; when installing the remaining expansion pins 8, the elastic ring 6 can be expanded with the help of corresponding tooling, so that the elastic ring 6 expands and deforms radially outward, so that the remaining expansion pins 8 can be easily inserted into the corresponding mounting holes 28. It should be noted that under the external force applied by the corresponding tooling, the elastic ring 6 expands, and its opening 61 also increases accordingly. The degree of the increase is controlled by the tooling so as not to affect the smooth installation of the expansion pin 8.

[0064] See also Figure 8c After all the expansion pins 8 are inserted into the mounting holes 28 and the elastic ring 6 is installed in place in the circumferential annular groove 46 through expansion deformation, a portion of the elastic ring 6 is located in the circumferential annular groove 46, thereby limiting the axial floating of the fixed scroll 2. The elastic ring 6 partially overlaps with the circumferential annular groove 46 in the radial direction, and the radial length of the overlapping portion is the second dimension G2, that is, the radial length of the portion of the elastic ring 6 located in the circumferential annular groove 46 is the second dimension G2, and the second dimension G2 is less than the radial depth L14 of the circumferential annular groove 46 and greater than half of the radial depth L14 of the circumferential annular groove 46, thereby ensuring that the elastic ring 6 can stably float up and down in the circumferential annular groove 46 without easily slipping out of the groove and other failures.

[0065] In addition, after the elastic ring 6 is installed in place in the circumferential ring groove 46 by expansion deformation, the radial width of the elastic ring 46 (see Figure 8c , which can be calculated by half the difference between the outer diameter D32 and the inner diameter D31 of the elastic ring 6, that is, (D32-D31)×0.5) is less than the radius of the circumferential ring groove 46 (see Figure 8c , which can be calculated by half of the diameter D12 of the circumferential annular groove 46, i.e. D12×0.5) and the radial distance from the radial outer wall of the expansion pin 8 abutting against the elastic ring 46 to the axis of the fixed scroll 2 (see Figure 8c , can be calculated by the sum of one-half of the diameter D23 of the circle where the mounting hole 28 is located and one-half of the diameter D41 of the expansion pin 8, that is, the difference between D23×0.5+D41×0.5). In other words, the radial width of the elastic ring 46 should satisfy the following relationship:

[0066] (D32-D31)×0.5 <D12×0.5-(D23×0.5+D41×0.5)

[0067] In addition, after the elastic ring 6 is installed in place in the circumferential ring groove 46 through expansion deformation, the axial thickness of the elastic ring 46 is obviously smaller than the circumferential height H13 of the circumferential ring groove 46, but its specific height dimension needs to be determined based on the axial floating of the fixed scroll allowed in the scroll compressor.

[0068] Finally, after all the expansion pins 8 are inserted into the mounting holes 28 and the elastic ring 6 is installed in place in the circumferential annular groove 46 by expansion deformation, the tooling is removed, and the elastic ring 6 is kept in the proper position in the circumferential annular groove 46 by the expansion pins 8. Then, the anti-rotation pin is inserted into the circular hole groove 9 from top to bottom, thereby achieving the circumferential positioning of the fixed scroll. Since the circular hole groove 9 is located in the opening 61 of the elastic ring 6 after the elastic ring 6 is installed in place in the circumferential annular groove 46, the anti-rotation pin will not interfere with the elastic ring 6 during the insertion of the circular hole groove 9.

[0069] In an exemplary embodiment of the present invention, radial centering of the fixed scroll can be achieved through the small clearance fit between the bearing seat positioning surface F1 and the fixed scroll positioning surface F2, axial limitation and floating of the fixed scroll can be achieved through the clearance fit between the elastic ring 6 and the circumferential ring groove 46, and circumferential limitation of the fixed scroll can be achieved through the fit between the anti-rotation pin and the circular hole groove 9. Compared with the axially flexible fastening structure of the fixed scroll with the lug fitted with the fastener with the guide sleeve, or the axially flexible fastening structure of the guide ring fitted with the fastener, the radial space occupied by the axially flexible fastening structure can be saved, thereby facilitating the increase of the scroll displacement without increasing the size of the compressor, and facilitating the miniaturization of the compressor.

[0070] In addition, in the exemplary embodiment of the present invention, the elastic ring 6 is first installed on the fixed scroll 2 in a free state and then installed in the circumferential ring groove 46 by expansion deformation. Compared with the form of first compressing the elastic ring and then installing it in the groove by releasing it, the compression step can be avoided. Especially when the elastic ring is large in size and difficult to compress, resulting in difficulty in assembly, the elastic ring can be easier to install, and it is also convenient for the assembly, disassembly, reinstallation and replacement of parts of the scroll compressor.

[0071] The present invention allows for various feasible variations. For example, in the above-mentioned embodiment, it is described that the circumferential annular groove is formed in the main bearing seat. However, it is understood that the circumferential annular groove can also be formed on other suitable fixed parts, such as directly forming the circumferential annular groove on the housing (such as the housing body) (in this case, it can be considered to provide a thickened portion on the corresponding part of the housing body to facilitate the formation of the circumferential annular groove), or forming the circumferential annular groove on a fixed member (such as a member similar to a guide ring) fixedly connected to the housing and / or the main bearing seat.

[0072] 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 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 fall within the scope of the present invention. Moreover, all components described herein may be replaced by other technically equivalent components.

Claims

1. A scroll compressor, the scroll compressor include: A scroll mechanism, the scroll mechanism comprising a fixed scroll (2), the fixed scroll (2) comprising a fixed scroll end plate (21), a fixed scroll wrap extending from one side of the fixed scroll end plate (21), and an outer peripheral wall (23), the outer peripheral wall (23) being arranged on the outer periphery of the fixed scroll wrap; as well as a main bearing seat (4), the main bearing seat (4) being adapted to support the scroll mechanism and comprising a main body portion (48) and an axial seat portion (49) extending axially from the main body portion, a circumferential annular groove (46) being formed at an inner peripheral surface of the axial seat portion (49), It is characterized in that the scroll compressor also includes an elastic ring (6) arranged between the outer peripheral wall (23) and the axial seat portion, and a thrust structure suitable for forcing the elastic ring (6) to expand radially outward, so that a portion of the elastic ring (6) in the radial direction is inserted into the circumferential ring groove (46) to limit the axial movement of the fixed scroll (2) away from the main bearing seat (4).

2. The scroll compressor according to claim 1, It is characterized in that The outer peripheral wall (23) comprises a first wall portion (231) and a second wall portion (232) along the axial direction, a step portion (233) is provided between the first wall portion (231) and the second wall portion (232), and the elastic ring (6) is arranged on the step portion (233).

3. The scroll compressor according to claim 2, It is characterized in that The pushing structure comprises a mounting hole (28) arranged at the step portion and an expansion pin (8) installed in the mounting hole and suitable for pushing the elastic ring radially outward.

4. The scroll compressor according to claim 3, It is characterized in that A cutting portion (25) is provided at a position of the first wall portion (231) corresponding to the mounting hole (28).

5. The scroll compressor according to claim 3, It is characterized in that The main bearing seat (4) includes a first seat portion (41) and a second seat portion (42) along the axial direction, the first seat portion (41) is provided with the circumferential ring groove (46) and is arranged opposite to the first wall portion (231), the second seat portion (42) is arranged opposite to the second wall portion (232), and the inner circumferential surface of the second seat portion (42) cooperates with the outer circumferential surface of the second wall portion (232) to limit the radial movement of the fixed vortex relative to the main bearing seat.

6. The scroll compressor according to claim 5, It is characterized in that The outer diameter of the elastic ring (6) when in a free state is smaller than the inner diameter of the first seat portion (41), and the inner diameter of the elastic ring (6) is larger than the outer diameter of the first wall portion (231).

7. The scroll compressor according to any one of claims 3 to 6, It is characterized in that The expansion pin (8, 8') is constructed as a hollow spring pin with longitudinal openings (81) opened at both ends, a cylindrical positioning pin with external threads, or a positioning pin with a head at one end and a flat portion (8'3) extending in the axial direction of the expansion pin.

8. The scroll compressor according to any one of claims 1 to 6, It is characterized in that The elastic ring (6) is configured as a circular ring having an opening (61).

9. The scroll compressor according to any one of claims 1 to 6, It is characterized in that The radial dimension (G2) of the portion of the elastic ring (6) located in the circumferential annular groove (46) is greater than 1 / 2 of the radial depth (L14) of the circumferential annular groove (46).

10. The scroll compressor according to any one of claims 1 to 6, It is characterized in that The axial thickness of the elastic ring (6) is smaller than the axial height (H13) of the circumferential ring groove (46).

11. The scroll compressor according to any one of claims 1 to 6, It is characterized in that The elastic ring (6) is configured not to be fixed to the fixed scroll or the main bearing seat, and is thus able to float in the axial direction along with the axial movement of the fixed scroll.

12. The scroll compressor according to any one of claims 1 to 6, It is characterized in that The outer peripheral surface of the outer peripheral wall (23) and the inner peripheral surface of the axial seat portion are respectively formed with a first semicircular groove (91) and a second semicircular groove (92), the first semicircular groove and the second semicircular groove cooperate to form a circular hole groove (9), and an anti-rotation pin is provided to be accommodated in the circular hole groove (9), thereby limiting the circumferential movement of the fixed scroll (2) relative to the main bearing seat (4).

13. A method for assembling a fixed scroll of a scroll compressor according to any one of claims 1 to 12, include: Arranging the fixed scroll (2) in the main bearing seat (4); as well as The elastic ring (6) is arranged on a step portion (233) provided on the outer peripheral wall of the fixed scroll, It is characterized in that the assembly method also includes inserting the expansion pin (8) of the push structure into the mounting hole (28) of the push structure arranged at the step portion from the radial inner side of the elastic ring (6), so that the elastic ring (6) expands radially outward and a part of the elastic ring (6) in the radial direction is inserted into the circumferential annular groove (46) formed on the inner circumferential surface of the axial seat portion (49) of the main bearing seat.

14. The assembly method according to claim 13, It is characterized in that When the fixed scroll (2) is arranged in the main bearing seat (4), a first semicircular groove (91) formed on the outer peripheral surface of the outer peripheral wall (23) is aligned with a second semicircular groove (92) formed on the inner peripheral surface of the axial seat portion (49) to form a circular hole groove (9), and the assembly method also includes inserting an anti-rotation pin into the circular hole groove (9).

15. The assembly method according to claim 13 or 14, It is characterized in that The step of inserting the expansion pin (8) into the mounting hole (28) from the radial inner side of the elastic ring (6) comprises: after the first expansion pin (8) is inserted into the mounting hole (28), using a tool to expand the elastic ring (6) radially outward, and removing the tool after the remaining expansion pins (8) are all inserted into the corresponding mounting holes (28).

Images