Scroll compressor

Abstract

The present invention discloses a scroll compressor, comprising: a housing defining a mounting cavity; an orbiting scroll and a stationary scroll, the orbiting scroll and the stationary scroll cooperating to define a compression cavity, the stationary scroll having a stationary scroll exhaust hole communicating with the compression cavity; a backpressure mechanism, the backpressure mechanism being annular, defining a backpressure cavity between the backpressure mechanism and the stationary scroll, the backpressure mechanism also having a first through hole; an end cover, the housing having an oil return baffle on one side near the end cover, the oil return baffle having a second through hole, the stationary scroll being disposed adjacent to the end cover relative to the orbiting scroll, the end cover having an exhaust passage, the oil return baffle having a baffle exhaust hole communicating with the stationary scroll exhaust hole, the end cover having an end cover exhaust hole communicating with the baffle exhaust hole and the exhaust passage, and a backpressure pipe on the side of the end cover facing the oil return baffle, the backpressure pipe being disposed within the second through hole and the first through hole to communicate the backpressure cavity with the exhaust passage. The scroll compressor according to the present invention has excellent performance and high reliability.

Description

Technical Field

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

[0002] In the prior art, the existence of axial gas force will push the static scroll to move away from the orbiting scroll, thereby increasing the axial clearance between the orbiting scroll and the static scroll, and increasing radial leakage. Some scroll compressors are provided with a back-pressure hole and a back-pressure cavity connected to the back-pressure hole on the static scroll. The gas in the back-pressure cavity and the spring push the static scroll to move toward the orbiting scroll, thereby achieving radial sealing between the orbiting scroll and the static scroll. However, this structure usually has the problem of discontinuous back-pressure supply. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a scroll compressor that has good performance and high reliability, can ensure the continuity of back pressure supply, and reduce fluctuations in gas pressure in the back pressure chamber.

[0004] The scroll compressor according to an embodiment of the present invention comprises: a housing, an installation cavity is defined in the housing; an orbiting scroll and a static scroll, the orbiting scroll and the static scroll are arranged in the installation cavity, the orbiting scroll and the static scroll cooperate to define a compression cavity, the static scroll has a static scroll exhaust hole connected to the compression cavity; a back pressure mechanism, the back pressure mechanism is arranged on a side of the static scroll away from the orbiting scroll, the back pressure mechanism is annular, a back pressure cavity is defined between the back pressure mechanism and the static scroll, and the back pressure mechanism also has a first through hole; an end cover, the housing is close to One side of the end cover is provided with an oil return baffle, the end cover is connected to the oil return baffle, the oil return baffle is provided with a second through hole, the static scroll is arranged adjacent to the end cover relative to the movable scroll, the end cover is provided with an exhaust channel, the oil return baffle is provided with a baffle exhaust hole connected to the static scroll exhaust hole, the end cover is provided with an end cover exhaust hole connected to the baffle exhaust hole and the exhaust channel, the end cover is provided with a back pressure pipe on the side facing the oil return baffle, the back pressure pipe is passed through the second through hole and the first through hole to connect the back pressure chamber and the exhaust channel.

[0005] In a scroll compressor according to an embodiment of the present invention, the intermediate-pressure gas within the backpressure chamber balances some of the axial gas force, pushing the stationary scroll toward the orbiting scroll, bringing it into close contact with the orbiting scroll. This reduces the axial clearance between the orbiting and stationary scrolls, minimizing radial leakage and safeguarding the performance and reliability of the scroll compressor. Furthermore, by connecting the backpressure chamber to the exhaust passage, the risk of the orbiting scroll blocking the first through hole during operation, as in the prior art, is avoided, ensuring the continuity of the backpressure supply and minimizing fluctuations in the gas pressure within the backpressure chamber.

[0006] In addition, the scroll compressor according to the present invention may also have the following additional technical features:

[0007] In some embodiments, the back pressure chamber extends in a ring shape along the circumferential direction of the static scroll, and a first sealing ring and a second sealing ring are provided between the back pressure mechanism and the static scroll, and the first sealing ring and the second sealing ring are respectively located on the radial inner side and the radial outer side of the back pressure chamber.

[0008] In some embodiments, an annular groove is provided on the side of the back-pressure mechanism facing the static vortex, and the inner wall of the groove and the surface of the static vortex facing away from the movable vortex together form the back-pressure chamber; or an annular groove is provided on the side of the static vortex facing the back-pressure mechanism, and the inner wall of the groove and the surface of the back-pressure mechanism facing the static vortex together form the back-pressure chamber; or an annular first groove is provided on the side of the back-pressure mechanism facing the static vortex, and an annular second groove is provided on the side of the static vortex facing the back-pressure mechanism, the openings of the first groove and the second groove are opposite and connected, and the inner wall of the first groove and the inner wall of the second groove together form the back-pressure chamber.

[0009] In some embodiments, the side of the static scroll facing away from the movable scroll has a boss surrounding the static scroll exhaust hole, and the inner wall of the boss and the surface of the return oil baffle facing the static scroll together define a static scroll exhaust chamber, and the static scroll exhaust chamber is connected to the static scroll exhaust hole and the baffle exhaust hole.

[0010] In some embodiments, a third sealing ring is provided between a surface of the boss facing away from the orbiting scroll and a surface of the oil return baffle facing the fixed scroll.

[0011] In some embodiments, a fourth sealing ring is provided between the inner peripheral wall of the first through hole and the outer peripheral wall of the back pressure tube.

[0012] In some embodiments, the first through hole includes a first hole segment and a second hole segment along the axial direction of the first through hole, the aperture of the first hole segment is smaller than the aperture of the second hole segment, the fourth sealing ring is arranged between the outer circumferential wall of the back pressure tube and the inner circumferential wall of the second hole segment, and the fourth sealing ring is interference fit with the back pressure tube.

[0013] In some embodiments, a fixing ring is further provided in the second hole segment, and the fixing ring is located on the side of the fourth sealing ring away from the first hole segment, and the fixing ring has an interference fit with the second hole segment; or, a retaining spring is further provided in the second hole segment, and the retaining spring is located on the side of the fourth sealing ring away from the first hole segment, and the retaining spring has an interference fit with the second hole segment.

[0014] In some embodiments, the static scroll has a first pressure relief channel and a second pressure relief channel, one end of the first pressure relief channel is connected to the back pressure chamber, one end of the second pressure relief channel is connected to the compression chamber, and the other end is connected to the side wall of the first pressure relief channel, and the scroll compressor also includes: a pressure relief mechanism, which is arranged in the first pressure relief channel, and the pressure relief mechanism is configured to connect the first pressure relief channel and the second pressure relief channel when the pressure in the back pressure chamber is greater than or equal to a preset value, and cut off the connection between the first pressure relief channel and the second pressure relief channel when the pressure in the back pressure chamber is lower than the preset value.

[0015] In some embodiments, the pressure relief mechanism includes: a first plug, which is fixed in the first pressure relief channel and located on the side of the position where the second pressure relief channel and the first pressure relief channel are connected, away from the back pressure chamber; an elastic member, which is located on the side of the first plug facing the back pressure chamber, and one end of the elastic member is connected to the first plug; a second plug, which is located on the side of the elastic member facing the back pressure chamber and is connected to the other end of the elastic member, and the second plug is driven by the elastic member to connect the first pressure relief channel and the second pressure relief channel when the pressure in the back pressure chamber is greater than or equal to a preset value, and cuts off the connection between the first pressure relief channel and the second pressure relief channel when the pressure in the back pressure chamber is lower than the preset value.

[0016] In some embodiments, one end of the first pressure relief channel away from the back pressure chamber is located on the outer wall surface of the static scroll, and the first plug is interference fit with the first pressure relief channel to seal the end of the first pressure relief channel away from the back pressure chamber.

[0017] In some embodiments, the first pressure relief channel includes a first sub-pressure relief channel and a second sub-pressure relief channel, one end of the first sub-pressure relief channel is connected to the back pressure chamber, one end of the second sub-pressure relief channel is connected to an end of the first sub-pressure relief channel facing away from the back pressure chamber, the first sub-pressure relief channel and the second sub-pressure relief channel are at an angle to each other, one end of the second pressure relief channel is connected to the second sub-pressure relief channel, and the pressure relief mechanism is disposed in the second sub-pressure relief channel.

[0018] In some embodiments, a fifth sealing ring is provided between the second through hole and the back pressure pipe; and / or a sixth sealing ring is provided between the return oil baffle and the shell; and / or a seventh sealing ring is provided between the return oil baffle and the end cover.

[0019] In some embodiments, the oil return baffle is connected to the shell by fasteners; and / or, the oil return baffle is connected to the end cover by fasteners; and / or, the back pressure mechanism and the static scroll are connected by fasteners.

[0020] In some embodiments, an annular rib extending along the circumferential direction of the end cover is provided on the side of the end cover facing the return oil baffle, and the annular rib is connected to the return oil baffle. The inner peripheral wall of the annular rib, the surface of the end cover facing the return oil baffle, and the surface of the return oil baffle facing the end cover jointly define an end cover exhaust cavity, and the end cover exhaust cavity is connected to the baffle exhaust hole and the end cover exhaust hole.

[0021] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0023] Figure 1 is a schematic cross-sectional view of a scroll compressor according to an embodiment of the present invention, showing the gas flow direction;

[0024] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0025] Figure 3 is a perspective view of a fixing ring of a back pressure mechanism of a scroll compressor according to an embodiment of the present invention;

[0026] Figure 4 is a perspective view of an end cover of a scroll compressor according to an embodiment of the present invention;

[0027] Figure 5is a front view of an end cover of a scroll compressor according to an embodiment of the present invention;

[0028] Figure 6 is a perspective view of a back pressure structure of a scroll compressor according to an embodiment of the present invention;

[0029] Figure 7 is a front view of a back pressure structure of a scroll compressor according to an embodiment of the present invention;

[0030] Figure 8 is a perspective view of an oil return baffle of a scroll compressor according to an embodiment of the present invention;

[0031] Figure 9 is a perspective view from another angle of the oil return baffle of the scroll compressor according to an embodiment of the present invention;

[0032] Figure 10 is a front view of an oil return baffle of a scroll compressor according to an embodiment of the present invention;

[0033] Figure 11 It is along Figure 10 Cross-sectional view along the midline BB;

[0034] Figure 12 is a front view of a fixed scroll of a scroll compressor according to an embodiment of the present invention;

[0035] Figure 13 It is along Figure 12 Cross-sectional view along the mid-CC line;

[0036] Figure 14 is a front view of a pressure relief mechanism of a scroll compressor according to an embodiment of the present invention;

[0037] Figure 15 is a cross-sectional view of the cooperation between the fixed scroll and the back pressure mechanism of another embodiment of the scroll compressor according to the embodiment of the present invention;

[0038] Figure 16 is a front view of a stationary scroll of another embodiment of a scroll compressor according to an embodiment of the present invention;

[0039] Figure 17 FIG. 4 is a perspective view of a back pressure mechanism of another embodiment of a scroll compressor according to an embodiment of the present invention.

[0040] Reference numerals:

[0041] 100. Scroll compressor;

[0042] 1. Housing; 11. Mounting cavity; 12. Sixth sealing groove; 121. Sixth sealing ring;

[0043] 2. Oil return baffle; 21. Second through hole; 211. Fifth sealing groove; 2111. Fifth sealing ring; 22. Baffle exhaust hole; 23. Seventh sealing groove; 231. Seventh sealing ring; 24. Mounting lug; 25. Mounting post;

[0044] 3. Orbital scroll; 31. Compression chamber; 311. Compression chamber; 32. Orbital scroll tooth;

[0045] 4. Stationary scroll; 41. Stationary scroll exhaust hole; 42. Boss; 421. Stationary scroll exhaust chamber; 422. Third sealing groove; 4221. Third sealing ring; 43. First pressure relief channel; 431. First sub-pressure relief channel; 432. Second sub-pressure relief channel; 44. Second pressure relief channel; 45. Third mounting hole; 46. Stationary scroll tooth;

[0046] 5. Back pressure mechanism; 51. Groove; 511. Back pressure chamber; 52. First through hole; 521. First hole section; 522. Second hole section; 5221. Fourth sealing ring; 5222. Retaining ring; 53. First sealing groove; 531. First sealing ring; 54. Second sealing groove; 541. Second sealing ring; 55. Second mounting hole;

[0047] 6. End cover; 61. Exhaust channel; 611. Opening; 62. End cover exhaust hole; 63. Back pressure pipe; 64. Annular rib; 65. End cover exhaust cavity; 66. First mounting hole;

[0048] 7. Pressure relief mechanism; 71. First plug; 72. Elastic member; 73. Second plug. DETAILED DESCRIPTION

[0049] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0052] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0053] Hereinafter, a scroll compressor 100 according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0054] like Figure 1 As shown, a scroll compressor 100 according to an embodiment of the present invention includes a casing 1 , an oil return partition 2 , a movable scroll 3 , a fixed scroll 4 , a back pressure mechanism 5 and an end cover 6 .

[0055] Specifically, refer to the attached Figure 1 As shown, the housing 1 defines an installation cavity 11, the orbiting scroll 3 and the fixed scroll 4 are arranged in the installation cavity 11, and the orbiting scroll 3 and the fixed scroll 4 cooperate to define a compression cavity 31. The fixed scroll 4 has a fixed scroll exhaust hole 41 connected to the compression cavity 31. It can be understood that, referring to the attached Figure 1 As shown, a movable scroll 3 is provided with a movable scroll tooth 32, and a static scroll 4 is provided with a static scroll tooth 46. The movable scroll tooth 32 and the static scroll tooth 46 are meshed with each other to form a plurality of compression cavities 311. The plurality of compression cavities 311 constitute a compression cavity 31. The fluid gradually flows from the compression cavities 311 on the radial outside of the movable scroll 3 to the radial inside of the movable scroll 3 and is compressed and the pressure increases, and is finally discharged from the static scroll exhaust hole 41.

[0056] Further, refer to the attached Figure 1 As shown, the back pressure mechanism 5 is arranged on the side of the fixed scroll 4 away from the movable scroll 3. The back pressure mechanism 5 is annular. A back pressure cavity 511 is defined between the back pressure mechanism 5 and the fixed scroll 4. The back pressure mechanism 5 also has a first through hole 52.

[0057] Further, see the attached Figure 1 and attached Figure 8As shown, the shell 1 has an oil return baffle 2 on one side close to the end cover 6 , the end cover 6 is connected to the oil return baffle 2 , the oil return baffle 2 has a second through hole 21 , and the fixed scroll 4 is arranged adjacent to the end cover 6 relative to the movable scroll 3 .

[0058] Further, refer to the attached Figure 1 , Attachment Figure 4 and attached Figure 5 As shown, the end cover 6 has an exhaust channel 61, the return oil baffle 2 has a baffle exhaust hole 22 connected to the static vortex exhaust hole 41, the end cover 6 has an end cover exhaust hole 62 connecting the baffle exhaust hole 22 and the exhaust channel 61, and the side of the end cover 6 facing the return oil baffle 2 has a back pressure pipe 63, the back pressure pipe 63 is passed through the second through hole 21 and the first through hole 52 to connect the back pressure chamber 511 and the exhaust channel 61, avoiding the risk of the movable scroll tooth in the prior art blocking the first through hole during operation, ensuring the continuity of the back pressure supply, and reducing the fluctuation of the gas pressure in the back pressure chamber 511.

[0059] Among them, refer to the attached Figure 1 As shown, the exhaust passage 61 is longitudinally (see the attached Figure 1 One end of the scroll compressor 100 (in the direction b shown) has an opening 611, and the gas in the scroll compressor 100 can directly flow out of the scroll compressor 100 through the opening 611 of the exhaust channel 61. Figure 1 As shown, the back pressure pipe 63 is provided on a side of the end cover 6 away from the opening 611 .

[0060] During the operation of the scroll compressor 100, the refrigerant gas is compressed in the compression chamber 31 defined by the orbiting scroll 3 and the stationary scroll 4, and then discharged from the stationary scroll exhaust hole 41. It then passes through the partition exhaust hole 22 and the end cover exhaust hole 62 and enters the exhaust channel 61. The gas entering the exhaust channel 61 is divided into two paths. One path flows directly out of the scroll compressor 100 from the opening 611, and the other path flows into the back pressure pipe 63 in a direction away from the opening 611, passes through the second through hole 21 and the first through hole 52 along the back pressure pipe 63, reaches the intermediate pressure after throttling and reducing the pressure, and finally flows into the back pressure chamber 511. It should be noted that the gas at the intermediate pressure flowing into the back pressure chamber 511 is mixed with some lubricating oil separated from the exhaust gas.

[0061] It is understandable that in the prior art, the presence of axial gas force pushes the stationary scroll away from the orbiting scroll, increasing the axial clearance between the orbiting and stationary scrolls and increasing radial leakage. The scroll compressor 100 of the present invention uses the intermediate-pressure gas in the back-pressure chamber 511 to balance some of the axial gas force, pushing the stationary scroll 4 toward the orbiting scroll 3, bringing the stationary scroll 4 into close contact with the orbiting scroll 3. This reduces the axial clearance between the orbiting scroll 32 and the stationary scroll 46, reduces radial leakage, and ensures the performance and reliability of the scroll compressor 100.

[0062] In the scroll compressor 100 according to an embodiment of the present invention, the intermediate-pressure gas within the back-pressure chamber 511 can partially balance the axial gas force, pushing the stationary scroll 4 toward the orbiting scroll 3, so that the stationary scroll 4 is closely attached to the orbiting scroll 3. This can reduce the axial clearance between the orbiting scroll 32 and the stationary scroll 46, reduce radial leakage, and ensure the performance and reliability of the scroll compressor 100. Furthermore, by connecting the back-pressure chamber 511 with the exhaust passage 61, the risk of the orbiting scroll blocking the first through hole during operation, as in the prior art, is avoided, thereby ensuring the continuity of the back-pressure supply and reducing fluctuations in the gas pressure within the back-pressure chamber 511.

[0063] In some embodiments of the present invention, Figure 1 , Attachment Figure 6 and attached Figure 7 As shown, the back pressure chamber 511 extends in a ring shape along the circumferential direction of the static scroll 4, and the back pressure mechanism 5 has a first sealing groove 53 and a second sealing groove 54. The first sealing groove 53 and the second sealing groove 54 extend in a ring shape along the circumferential direction of the static scroll 4, and the first sealing groove 53 is located on the radial inner side of the back pressure chamber 511, and the second sealing groove 54 is located on the radial outer side of the back pressure chamber 511.

[0064] Of course, the present invention is not limited to this. At least one of the first sealing groove 53 and the second sealing groove 54 may also be provided on the static scroll 4. In other words, both the first sealing groove 53 and the second sealing groove 54 may be provided on the back pressure mechanism 5; or one of the first sealing groove 53 and the second sealing groove 54 may be provided on the back pressure mechanism 5, and the other may be provided on the static scroll 4; or both the first sealing groove 53 and the second sealing groove 54 may be provided on the static scroll 4. There is no limitation here.

[0065] Further, refer to the attached Figure 2As shown, a first sealing ring 531 and a second sealing ring 541 are provided between the back pressure mechanism 5 and the static scroll 4. The first sealing ring 531 and the second sealing ring 541 are respectively located radially inward and radially outward of the back pressure chamber 511. The first sealing ring 531 is provided in the first sealing groove 53, and the second sealing ring 541 is provided in the second sealing groove 54. The provision of the first sealing ring 531 and the second sealing ring 541 can achieve a static seal between the back pressure mechanism 5 and the static scroll 4, thereby improving the sealing performance between the back pressure mechanism 5 and the static scroll 4. Optionally, the first sealing ring 531 and the second sealing ring 541 are made of nitrile rubber, which has good oil resistance, heat resistance, and air tightness, and has high hardness and strong adhesion.

[0066] In some embodiments of the present invention, Figure 1 and attached Figure 6 As shown, an annular groove 51 is provided on the side of the back pressure mechanism 5 facing the static scroll 4. The inner wall of the groove 51 and the surface of the static scroll 4 facing away from the movable scroll 3 together form a back pressure chamber 511. The back pressure chamber 511 is used to store gas at an intermediate pressure and generate a certain pressure to push the static scroll 4 to move toward the direction close to the movable scroll 3, thereby realizing radial sealing between the movable scroll 3 and the static scroll 4.

[0067] In other embodiments of the present invention, refer to the attached Figure 15 , Attachment Figure 16 and attached Figure 17 As shown, an annular groove 51 is provided on the side of the static scroll 4 facing the back pressure mechanism 5, and the inner wall of the groove 51 and the surface of the back pressure mechanism 5 facing the static scroll 4 together form a back pressure chamber 511. The back pressure chamber 511 is used to store gas at an intermediate pressure and generate a certain pressure to push the static scroll 4 to move toward the direction close to the movable scroll 3, thereby realizing radial sealing between the movable scroll 3 and the static scroll 4.

[0068] In other embodiments of the present invention, a first annular groove is provided on the side of the back pressure mechanism 5 facing the static scroll 4, and a second annular groove is provided on the side of the static scroll 4 facing the back pressure mechanism 5. The openings of the first groove and the second groove are relative and connected. The inner wall of the first groove and the inner wall of the second groove together form a back pressure chamber 511. The back pressure chamber 511 is used to store gas at intermediate pressure and generate a certain pressure to push the static scroll 4 to move toward the direction close to the movable scroll 3, thereby realizing radial sealing between the movable scroll 3 and the static scroll 4.

[0069] In some embodiments of the present invention, Figure 1 and attached Figure 13As shown, the side of the fixed scroll 4 facing away from the orbiting scroll 3 includes a boss 42 surrounding the fixed scroll exhaust hole 41. The inner wall of the boss 42 and the surface of the oil return baffle 2 facing the fixed scroll 4 jointly define a fixed scroll exhaust chamber 421. The fixed scroll exhaust chamber 421 is in communication with the fixed scroll exhaust hole 41 and the baffle exhaust hole 22. It will be appreciated that during operation of the scroll compressor 100, refrigerant gas is compressed in the compression chamber 31 defined by the orbiting scroll 3 and the fixed scroll 4, and then discharged from the fixed scroll exhaust hole 41 into the fixed scroll exhaust chamber 421, flowing through the baffle exhaust hole 22 to the exhaust passage 61.

[0070] In a further embodiment of the present invention, referring to the attached Figure 12 As shown, a third sealing groove 422 is provided on one of the surface of the boss 42 facing away from the orbiting scroll 3 and the surface of the oil return partition 2 facing the fixed scroll 4. The third sealing groove 422 extends in an annular shape along the circumferential direction of the boss 42. In a specific example, refer to the attached Figure 1 and attached Figure 13 As shown, the third sealing groove 422 is provided on the surface of the boss 42 away from the movable scroll 3. Figure 2 As shown, a third sealing ring 4221 is provided between the surface of the boss 42 facing away from the orbiting scroll 3 and the surface of the oil return baffle 2 facing the stationary scroll 4. The third sealing ring 4221 is disposed within the third sealing groove 422, thereby achieving a static seal between the stationary scroll 4 and the oil return baffle 2, thereby improving the sealing between the stationary scroll 4 and the oil return baffle 2. Optionally, the third sealing ring 4221 is made of nitrile rubber, which has excellent oil resistance, heat resistance, and airtightness, and has high hardness and strong adhesion.

[0071] In some embodiments of the present invention, Figure 2 As shown, a fourth sealing ring 5221 is provided between the inner peripheral wall of the first through hole 52 and the outer peripheral wall of the back pressure pipe 63, which is used to realize dynamic sealing between the first through hole 52 and the back pressure pipe 63, and can be used in the back pressure mechanism 5 as the static scroll 4 moves in the arrangement direction of the movable scroll 3 and the static scroll 4 (see the attached FIG. Figure 2 The fourth sealing ring 5221 is preferably made of PTFE, which has excellent wear resistance and can ensure the sealing between the first through hole 52 and the back-pressure pipe 63 when relative movement occurs between the first through hole 52 and the back-pressure pipe 63. It can also extend the service life of the fourth sealing ring 5221 and reduce the maintenance cost and frequency of the scroll compressor 100.

[0072] In a further embodiment of the present invention, referring to the attached Figure 2 As shown, the first through hole 52 is along the axial direction of the first through hole 52 (refer to the attached Figure 2The back pressure tube 63 is provided with a first hole section 521 and a second hole section 522, wherein the aperture of the first hole section 521 is smaller than the aperture of the second hole section 522, and the fourth sealing ring 5221 is arranged between the outer peripheral wall of the back pressure tube 63 and the inner peripheral wall of the second hole section 522. The fourth sealing ring 5221 is interference fit with the back pressure tube 63, which can improve the reliability of the fixation of the fourth sealing ring 5221 and improve the stability and sealing of the fit between the first through hole 52 and the back pressure tube 63.

[0073] In a further embodiment of the present invention, referring to the attached Figure 2 and attached Figure 3 As shown, a fixing ring 5222 is further provided in the second hole section 522. The fixing ring 5222 is located on the side of the fourth sealing ring 5221 away from the first hole section 521. The fixing ring 5222 is interference fit with the second hole section 522. The fixing ring 5222 is used to fix the fourth sealing ring 5221, thereby improving the reliability of the fourth sealing ring 5221, and thereby improving the stability and sealing of the cooperation between the first through hole 52 and the back pressure tube 63.

[0074] In other embodiments of the present invention, a retaining spring is further provided in the second hole section 522. The retaining spring is located on the side of the fourth sealing ring 5221 away from the first hole section 521. The retaining spring is interference fit with the second hole section 522. The retaining spring is used to fix the fourth sealing ring 5221, thereby improving the reliability of the fourth sealing ring 5221, and thereby improving the stability and sealing of the cooperation between the first through hole 52 and the back pressure tube 63.

[0075] In some embodiments of the present invention, Figure 2 and attached Figure 13 As shown, the static scroll 4 has a first pressure relief channel 43 and a second pressure relief channel 44, one end of the first pressure relief channel 43 is connected to the back pressure chamber 511, one end of the second pressure relief channel 44 is connected to the compression chamber 31, and the other end is connected to the side wall of the first pressure relief channel 43. It can be understood that during the operation of the scroll compressor 100, the gas flowing from the back pressure pipe 63 to the back pressure chamber 511 can flow to the first pressure relief channel 43, thereby increasing the space for storing the intermediate pressure gas, pushing the static scroll 4 to move toward the direction close to the movable scroll 3, so that the static scroll 4 is close to the movable scroll 3, further reducing the axial gap between the movable scroll tooth 32 and the static scroll tooth 46, and reducing radial leakage.

[0076] Further, refer to the attached Figure 2 and attached Figure 14As shown, the scroll compressor 100 further includes a pressure relief mechanism 7, which is disposed in the first pressure relief channel 43. The pressure relief mechanism 7 is configured to connect the first pressure relief channel 43 and the second pressure relief channel 44 when the pressure in the back pressure chamber 511 is greater than or equal to a preset value, and to cut off the connection between the first pressure relief channel 43 and the second pressure relief channel 44 when the pressure in the back pressure chamber 511 is lower than the preset value. It is understandable that when the pressure in the back pressure chamber 511 is greater than or equal to the preset value, the first pressure relief channel 43 is connected to the second pressure relief channel 44, and the gas in the back pressure chamber 511 can flow to the compression chamber 31 through the first pressure relief channel 43 and the second pressure relief channel 44; when the pressure in the back pressure chamber 511 is lower than the preset value, the connection between the first pressure relief channel 43 and the second pressure relief channel 44 is cut off, and the gas in the back pressure chamber 511 and the first pressure relief channel 43 cannot flow to the compression chamber 31 through the second pressure relief channel 44.

[0077] In addition, since the gas in the back pressure chamber 511 flows toward the compression chamber 31 when the first pressure relief channel 43 is connected to the second pressure relief channel 44, and this part of the gas is mixed with some of the lubricating oil separated from the exhaust gas, this part of the lubricating oil also flows back into the compression chamber 31 along with the gas, which can reduce the loss of lubricating oil in the scroll compressor 100 to a certain extent.

[0078] In a further embodiment of the present invention, referring to the attached Figure 14 As shown, the pressure relief mechanism 7 includes a first plug 71, an elastic member 72 and a second plug 73. Figure 2 As shown, the first plug 71 is fixedly disposed in the first pressure relief channel 43 and is located on a side of the connection between the second pressure relief channel 44 and the first pressure relief channel 43, away from the back pressure chamber 511. Furthermore, an elastic member 72 is located on a side of the first plug 71 facing the back pressure chamber 511, and one end of the elastic member 72 is connected to the first plug 71.

[0079] Further, see the attached Figure 2 As shown, the second plug 73 is located on the side of the elastic member 72 facing the back pressure chamber 511 and is connected to the other end of the elastic member 72. Driven by the elastic member 72, the second plug 73 connects the first pressure relief channel 43 and the second pressure relief channel 44 when the pressure in the back pressure chamber 511 is greater than or equal to a preset value. When the pressure in the back pressure chamber 511 is lower than the preset value, the connection between the first pressure relief channel 43 and the second pressure relief channel 44 is cut off.

[0080] It can be understood that when the pressure in the back pressure chamber 511 is greater than or equal to a preset value, the second plug 73 is located on the side of the connection position between the first pressure relief channel 43 and the second pressure relief channel 44 that is away from the back pressure chamber 511, and when the pressure in the back pressure chamber 511 is lower than the preset value, the second plug 73 is located at the connection position between the first pressure relief channel 43 and the second pressure relief channel 44 or at the side of the connection position between the first pressure relief channel 43 and the second pressure relief channel 44 that faces the back pressure chamber 511.

[0081] It can be understood that when the pressure in the back pressure chamber 511 is greater than or equal to a preset value, the pressure on the second plug 73 from the gas in the back pressure chamber 511 is greater than the elastic force of the elastic member 72 on the second plug 73, and the second plug 73 moves toward the direction close to the first plug 71. When the second plug 73 moves to the side away from the back pressure chamber 511 where the first pressure relief channel 43 and the second pressure relief channel 44 are connected, the first pressure relief channel 43 is connected to the second pressure relief channel 44, and the gas in the back pressure chamber 511 can flow to the compression chamber 511 through the first pressure relief channel 43 and the second pressure relief channel 44. cavity 31; when the pressure in the back-pressure cavity 511 is lower than a preset value, the pressure of the gas in the back-pressure cavity 511 received by the second plug 73 is less than the elastic force of the elastic member 72 on the second plug 73, and the second plug 73 moves in the direction away from the first plug 71. When the second plug 73 moves to the side of the back-pressure cavity 511 where the first pressure relief channel 43 and the second pressure relief channel 44 are connected, the first pressure relief channel 43 is disconnected from the second pressure relief channel 44, and the gas in the back-pressure cavity 511 and the first pressure relief channel 43 cannot pass through the second pressure relief channel 44 to reach the compression cavity 31.

[0082] In a further embodiment of the present invention, referring to the attached Figure 2 As shown, the end of the first pressure relief channel 43 away from the back pressure chamber 511 is located on the outer wall surface of the static scroll 4, and the first plug 71 is interference fit with the first pressure relief channel 43 to seal the end of the first pressure relief channel 43 away from the back pressure chamber 511, which can improve the reliability of the fixation of the first plug 71, improve the stability and sealing of the fit between the first plug 71 and the first pressure relief channel 43, and at the same time simplify the processing method of the first pressure relief channel 43.

[0083] In a further embodiment of the present invention, referring to the attached Figure 2 and attached Figure 13As shown, the first pressure relief channel 43 includes a first sub-pressure relief channel 431 and a second sub-pressure relief channel 432. One end of the first sub-pressure relief channel 431 is connected to the back pressure chamber 511, and one end of the second sub-pressure relief channel 432 is connected to an end of the first sub-pressure relief channel 431 facing away from the back pressure chamber 511. The first sub-pressure relief channel 431 and the second sub-pressure relief channel 432 are at an angle to each other, and one end of the second pressure relief channel 44 is connected to the second sub-pressure relief channel 432. The pressure relief mechanism 7 is arranged in the second sub-pressure relief channel 432, which can better control the movement of the second plug 73 along the radial direction of the static scroll 4, and control the connection and disconnection of the first pressure relief channel 43 and the second pressure relief channel 44.

[0084] In a specific example, see the attached Figure 2 and attached Figure 13 As shown, the included angle between the first sub-pressure relief channel 431 and the second sub-pressure relief channel 432 is 90°, which facilitates the production and processing of the static scroll 4.

[0085] In some embodiments of the present invention, Figure 11 As shown, a fifth sealing groove 211 is provided on the inner peripheral wall of the second through hole 21, and the fifth sealing groove 211 extends in a ring shape along the circumferential direction of the second through hole 21. Figure 2 As shown, a fifth sealing ring 2111 is provided between the second through hole 21 and the back-pressure pipe 63. The fifth sealing ring 2111 is disposed in the fifth sealing groove 211, thereby achieving a static seal between the oil return baffle 2 and the back-pressure pipe 63, thereby improving the sealing between the oil return baffle 2 and the back-pressure pipe 63. Optionally, the fifth sealing ring 2111 is made of nitrile rubber, which has excellent oil resistance, heat resistance, and airtightness, and has high hardness and strong adhesion.

[0086] Furthermore, a sixth sealing groove 12 is provided on one of the oil return partition plate 2 and the housing 1. The sixth sealing groove 12 extends in a ring shape along the circumferential direction of the housing 1. In a specific example, referring to the attached Figure 1 As shown, the sixth sealing groove 12 is provided on the housing 1. Figure 1 As shown, a sixth sealing ring 121 is provided between the oil return baffle 2 and the housing 1. The sixth sealing ring 121 is disposed in the sixth sealing groove 12, thereby achieving a static seal between the oil return baffle 2 and the housing 1 and improving the sealing between the oil return baffle 2 and the housing 1. Optionally, the sixth sealing ring 121 is made of nitrile rubber, which has excellent oil resistance, heat resistance, and air tightness, and has high hardness and strong adhesion.

[0087] Furthermore, a seventh sealing groove 23 is provided on one of the oil return baffle 2 and the end cover 6. The seventh sealing groove 23 extends in a ring shape along the circumferential direction of the oil return baffle 2. In a specific example, refer to the attached Figure 9 and attached Figure 10As shown, the seventh sealing groove 23 is provided on the oil return partition 2. Figure 1 As shown, a seventh sealing ring 231 is provided between the oil return baffle 2 and the end cover 6. The seventh sealing ring 231 is disposed in the seventh sealing groove 23, thereby achieving a static seal between the oil return baffle 2 and the end cover 6 and improving the sealing between the oil return baffle 2 and the end cover 6. Optionally, the seventh sealing ring 231 is made of nitrile rubber, which has excellent oil resistance, heat resistance, and airtightness, and has high hardness and strong adhesion.

[0088] In some embodiments of the present invention, the oil return baffle 2 is connected to the housing 1 by fasteners. Figure 8 As shown, the oil return baffle 2 is provided with a plurality of mounting lugs 24 spaced apart along the circumferential direction of the oil return baffle 2 for fasteners to pass through, so that the oil return baffle 2 can be fixed to the housing 1 at multiple locations, thereby improving the reliability of the connection between the oil return baffle 2 and the housing 1. In a specific example, as Figure 8 and attached Figure 10 As shown, the oil return baffle 2 is provided with four spaced apart mounting lugs 24 , which can be used to fix the oil return baffle 2 to the housing 1 from four sides.

[0089] Furthermore, the oil return baffle 2 is connected to the end cover 6 by fasteners, see the attached Figure 4 and attached Figure 9 As shown, the oil return baffle 2 is provided with a plurality of mounting posts 25 spaced apart along the circumferential direction of the oil return baffle 2, and the end cover 6 is provided with a plurality of first mounting holes 66 spaced apart along the circumferential direction of the end cover 6. The plurality of mounting posts 25 correspond to the first mounting holes 66 one-to-one, so that the oil return baffle 2 and the end cover 6 can be fixed at multiple locations, thereby improving the reliability of the connection between the oil return baffle 2 and the end cover 6. In a specific example, as Figure 5 and attached Figure 10 As shown, the oil return baffle 2 is provided with three spaced apart mounting posts 25 , and the end cover 6 is provided with three spaced apart first mounting holes 66 , so that the oil return baffle 2 and the end cover 6 can be fixed at three locations.

[0090] Furthermore, the back pressure mechanism 5 and the static scroll 4 are connected by fasteners. Figure 6 and attached Figure 12 As shown, the back pressure mechanism 5 is provided with a plurality of second mounting holes 55 spaced apart along the circumferential direction of the back pressure mechanism 5, and the fixed scroll 4 is provided with a plurality of third mounting holes 45 spaced apart along the circumferential direction of the fixed scroll 4. The plurality of second mounting holes 55 correspond one to one with the third mounting holes 45, so that the back pressure mechanism 5 and the fixed scroll 4 can be fixed at multiple locations, thereby improving the reliability of the connection between the back pressure mechanism 5 and the fixed scroll 4. In a specific example, as Figure 7 and attached Figure 12 As shown, the back pressure mechanism 5 is provided with three spaced apart second mounting holes 55 , and the static scroll 4 is provided with three spaced apart third mounting holes 45 , so that the back pressure mechanism 5 and the static scroll 4 can be fixed at three locations.

[0091] Optionally, the fasteners may be screws or other fasteners, which are not limited here.

[0092] In some embodiments of the present invention, Figure 4 and attached Figure 5 As shown, combined with the reference Figure 1 An annular rib 64 extending along the circumferential direction of the end cover 6 is provided on the side of the end cover 6 facing the oil return baffle 2. The annular rib 64 is connected to the oil return baffle 2. The inner peripheral wall of the annular rib 64, the surface of the end cover 6 facing the oil return baffle 2, and the surface of the oil return baffle 2 facing the end cover 6 jointly define an end cover exhaust chamber 65. The end cover exhaust chamber 65 is connected to the baffle exhaust hole 22 and the end cover exhaust hole 62. It can be understood that during the operation of the scroll compressor 100, the refrigerant gas is compressed in the compression chamber 31 defined by the orbiting scroll 3 and the fixed scroll 4, and then discharged from the fixed scroll exhaust hole 41. It then passes through the baffle exhaust hole 22 into the end cover exhaust chamber 65, and then flows to the exhaust channel 61 through the end cover exhaust hole 62.

[0093] Other structures and operations of the scroll compressor 100 according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0094] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0095] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A scroll compressor, characterized in that: include: A housing (1), wherein a mounting cavity (11) is defined within the housing (1); An orbiting scroll (3) and a stationary scroll (4), wherein the orbiting scroll (3) and the stationary scroll (4) are arranged in the mounting cavity (11), the orbiting scroll (3) and the stationary scroll (4) cooperate to define a compression cavity (31), and the stationary scroll (4) has a stationary scroll exhaust hole (41) communicating with the compression cavity (31); A back pressure mechanism (5), the back pressure mechanism (5) being arranged on a side of the fixed scroll (4) away from the movable scroll (3), the back pressure mechanism (5) being annular, a back pressure cavity (511) being defined between the back pressure mechanism (5) and the fixed scroll (4), and the back pressure mechanism (5) also having a first through hole (52); An end cover (6), the shell (1) has an oil return baffle (2) on one side close to the end cover (6), the end cover (6) is connected to the oil return baffle (2), the oil return baffle (2) has a second through hole (21), the static scroll (4) is arranged adjacent to the end cover (6) relative to the movable scroll (3), the end cover (6) has an exhaust channel (61), the oil return baffle (2) has a baffle exhaust hole (22) connected to the static scroll exhaust hole (41), the end cover (6) has an end cover exhaust hole (62) connected to the baffle exhaust hole (22) and the exhaust channel (61), the end cover (6) has a back pressure pipe (63) on the side facing the oil return baffle (2), the back pressure pipe (63) is passed through the second through hole (21) and the first through hole (52) to connect the back pressure chamber (511) and the exhaust channel (61).

2. The scroll compressor according to claim 1, wherein The back pressure chamber (511) is annular, and a first sealing ring (531) and a second sealing ring (541) are provided between the back pressure mechanism (5) and the static scroll (4), wherein the first sealing ring (531) and the second sealing ring (541) are respectively located on the radial inner side and the radial outer side of the back pressure chamber (511).

3. The scroll compressor according to claim 1, wherein: An annular groove (51) is provided on the side of the back pressure mechanism (5) facing the fixed scroll (4), and the inner wall of the groove (51) and the surface of the fixed scroll (4) facing away from the movable scroll (3) together form the back pressure chamber (511); Or a side of the static scroll (4) facing the back pressure mechanism (5) is provided with an annular groove (51), and the inner wall of the groove (51) and the surface of the back pressure mechanism (5) facing the static scroll (4) together form the back pressure chamber (511); Or a first annular groove is provided on the side of the back pressure mechanism (5) facing the static vortex (4), and a second annular groove is provided on the side of the static vortex (4) facing the back pressure mechanism (5), the openings of the first groove and the second groove are opposite and connected, and the inner wall of the first groove and the inner wall of the second groove jointly form the back pressure chamber (511).

4. The scroll compressor according to claim 1, wherein The side of the static scroll (4) facing away from the movable scroll (3) has a boss (42) surrounding the static scroll exhaust hole (41), and the inner wall of the boss (42) and the surface of the oil return baffle (2) facing the static scroll (4) together define a static scroll exhaust chamber (421), and the static scroll exhaust chamber (421) is connected to the static scroll exhaust hole (41) and the baffle exhaust hole (22).

5. The scroll compressor according to claim 4, characterized in that A third sealing ring (4221) is provided between the surface of the boss (42) facing away from the movable scroll (3) and the surface of the oil return partition (2) facing the fixed scroll (4).

6. The scroll compressor according to claim 1, wherein: A fourth sealing ring (5221) is provided between the inner peripheral wall of the first through hole (52) and the outer peripheral wall of the back pressure tube (63).

7. The scroll compressor according to claim 6, wherein: The first through hole (52) includes a first hole section (521) and a second hole section (522) along the axial direction of the first through hole (52), the aperture of the first hole section (521) is smaller than the aperture of the second hole section (522), the fourth sealing ring (5221) is arranged between the outer peripheral wall of the back pressure tube (63) and the inner peripheral wall of the second hole section (522), and the fourth sealing ring (5221) is interference fit with the back pressure tube (63).

8. The scroll compressor according to claim 7, wherein: A fixing ring (5222) is further provided in the second hole section (522), and the fixing ring (5222) is located on a side of the fourth sealing ring (5221) away from the first hole section (521), and the fixing ring (5222) is interference-fitted with the second hole section (522); Alternatively, a retaining spring is further provided in the second hole section (522), the retaining spring being located on a side of the fourth sealing ring (5221) away from the first hole section (521), and the retaining spring is interference-fitted with the second hole section (522).

9. The scroll compressor according to claim 1, wherein: The fixed scroll (4) has a first pressure relief channel (43) and a second pressure relief channel (44), one end of the first pressure relief channel (43) is in communication with the back pressure chamber (511), one end of the second pressure relief channel (44) is in communication with the compression chamber (31), and the other end is in communication with a side wall of the first pressure relief channel (43). The scroll compressor (100) further comprises: A pressure relief mechanism (7), the pressure relief mechanism (7) being arranged in the first pressure relief channel (43), the pressure relief mechanism (7) being configured to connect the first pressure relief channel (43) and the second pressure relief channel (44) when the pressure in the back pressure chamber (511) is greater than or equal to a preset value, and to cut off the connection between the first pressure relief channel (43) and the second pressure relief channel (44) when the pressure in the back pressure chamber (511) is lower than the preset value.

10. The scroll compressor according to claim 9, wherein: The pressure relief mechanism (7) comprises: a first plug (71), the first plug (71) being fixedly disposed in the first pressure relief channel (43) and located on a side away from the back pressure chamber (511) at a position where the second pressure relief channel (44) and the first pressure relief channel (43) communicate with each other; an elastic member (72), the elastic member (72) being located on a side of the first plug (71) facing the back pressure chamber (511), and one end of the elastic member (72) being connected to the first plug (71); A second plug (73), the second plug (73) is located on the side of the elastic member (72) facing the back pressure chamber (511) and is connected to the other end of the elastic member (72); the second plug (73), driven by the elastic member (72), connects the first pressure relief channel (43) and the second pressure relief channel (44) when the pressure in the back pressure chamber (511) is greater than or equal to a preset value; and cuts off the connection between the first pressure relief channel (43) and the second pressure relief channel (44) when the pressure in the back pressure chamber (511) is lower than the preset value.

11. The scroll compressor according to claim 10, wherein: The end of the first pressure relief channel (43) away from the back pressure chamber (511) is located on the outer wall surface of the static scroll (4), and the first plug (71) is interference-fitted with the first pressure relief channel (43) to seal the end of the first pressure relief channel (43) away from the back pressure chamber (511).

12. The scroll compressor according to claim 10, wherein: The first pressure relief channel (43) includes a first sub-pressure relief channel (431) and a second sub-pressure relief channel (432), one end of the first sub-pressure relief channel (431) is connected to the back pressure chamber (511), one end of the second sub-pressure relief channel (432) is connected to the end of the first sub-pressure relief channel (431) facing away from the back pressure chamber (511), the first sub-pressure relief channel (431) and the second sub-pressure relief channel (432) are angled with each other, one end of the second pressure relief channel (44) is connected to the second sub-pressure relief channel (432), and the pressure relief mechanism (7) is arranged in the second sub-pressure relief channel (432).

13. The scroll compressor according to claim 1, wherein A fifth sealing ring (2111) is provided between the second through hole (21) and the back pressure tube (63); And / or, a sixth sealing ring (121) is provided between the oil return partition (2) and the housing (1); And / or, a seventh sealing ring (231) is provided between the oil return partition (2) and the end cover (6).

14. The scroll compressor according to claim 1, wherein The oil return partition (2) is connected to the housing (1) via fasteners; and / or, the oil return baffle (2) and the end cover (6) are connected via fasteners; And / or, the back pressure mechanism (5) and the static scroll (4) are connected via fasteners.

15. The scroll compressor according to claim 1, wherein An annular convex rib (64) is provided on one side of the end cover (6) facing the oil return baffle (2), the annular convex rib (64) being connected to the oil return baffle (2), the inner peripheral wall of the annular convex rib (64), the surface of the end cover (6) facing the oil return baffle (2), and the surface of the oil return baffle (2) facing the end cover (6) jointly defining an end cover exhaust cavity (65), the end cover exhaust cavity (65) being in communication with the baffle exhaust hole (22) and the end cover exhaust hole (62).

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