A scroll compressor with a circulating lubrication circuit structure

Abstract

This application discloses a scroll compressor with a circulating lubrication circuit structure, comprising: a casing containing a bearing housing assembly, a suction chamber, and an oil sump; a stationary disk assembly fixedly disposed within the casing; a moving disk assembly eccentrically rotating relative to the stationary disk assembly and mating with the moving disk assembly to form a compression chamber, the compression chamber being connected to the suction chamber; the casing having a low-pressure chamber structure, a high-pressure chamber structure, and an oil separator channel; the high-pressure chamber structure being connected to the compression chamber and the oil separator channel; and a first oil return channel and a second oil return channel; the first oil return channel being connected to the oil separator channel and the low-pressure chamber structure, the low-pressure chamber structure being connected to the suction chamber, and the diameter of the first oil return channel being smaller than the diameter of the oil separator channel; a back pressure chamber being formed within the bearing housing assembly; and the second oil return channel having an oil inlet section and an oil outlet section, the oil inlet section being connected to the compression chamber and the back pressure chamber, and the oil outlet section being connected to the back pressure chamber and the suction chamber. This application has the advantages of ensuring stable performance under varying operating conditions and having a simple lubrication circuit structure.

Description

Technical Field

[0001] This application relates to the field of compressor technology, and more specifically, to a scroll compressor with a circulating lubrication circuit structure. Background Technology

[0002] With the rise and rapid development of the electric vehicle industry, traditional heat pump air conditioning systems using R134a as the working fluid are finding it increasingly difficult to meet the performance requirements of automobiles under varying operating conditions. In particular, the performance of R134a heat pump systems drops sharply when the ambient temperature decreases. Transcritical CO2 heat pump air conditioning systems, using CO2 as the working fluid, offer superior performance compared to the former, and CO2 as a refrigerant for automotive air conditioning is harmless to both the environment and human health.

[0003] Scroll compressors possess advantages such as low noise, small size, and high energy efficiency, making them promising for application in the field of heat pump air conditioning in electric vehicles. Therefore, CO2 scroll compressors are increasingly becoming a research hotspot. However, due to the characteristics of transcritical carbon dioxide circulation—high pressure ratio, small pressure difference, and high pressure—its application in scroll compressors requires addressing the oil circulation issues affecting lubrication and sealing. To solve these problems, existing compressor structures utilize multiple supply paths to separately supply lubricating oil to the back pressure chamber and suction space, effectively providing lubricating oil. However, the existing oil distribution structure of scroll compressors is complex and difficult to adapt to varying operating conditions.

[0004] Therefore, existing technologies need to be improved. Summary of the Invention

[0005] The purpose of this application is to provide a scroll compressor with a circulating lubrication circuit structure, which has the advantages of ensuring stable performance under varying operating conditions and a simple lubrication circuit structure.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0007] This application provides a scroll compressor with a circulating lubrication oil circuit structure, including: a housing, in which a bearing housing assembly is disposed, and an air intake chamber and an oil sump are formed on one side of the bearing housing assembly;

[0008] The static disk assembly is fixedly installed inside the casing.

[0009] The moving disk assembly rotates eccentrically relative to the stationary disk assembly and is matched with the moving disk assembly to form a compression chamber, which is connected to the intake chamber.

[0010] The housing contains a low-pressure chamber structure, a high-pressure chamber structure, and an oil separator channel; the high-pressure chamber structure connects the compression chamber and the oil separator channel.

[0011] The scroll compressor also includes a first oil return passage and a second oil return passage;

[0012] The first oil return channel connects the oil separator channel and the low-pressure chamber structure, and the low-pressure chamber structure connects to the intake chamber. The diameter of the first oil return channel is smaller than the diameter of the oil separator channel.

[0013] The bearing housing assembly and the moving disc assembly form a back pressure chamber. The second oil return channel has an oil inlet section and an oil outlet section. The oil inlet section connects the compression chamber and the back pressure chamber, and the oil outlet section connects the back pressure chamber and the suction chamber.

[0014] In one embodiment, the first oil return channel includes an inlet section that penetrates the stationary plate assembly and connects to the oil separator channel.

[0015] The throttling groove section is arranged around the end face of the stationary disc assembly and is connected to the inlet section;

[0016] The outlet section runs through the stationary disc assembly and connects the low-pressure chamber structure and the throttling groove section.

[0017] The stationary disc assembly also has a through-hole section that connects to the intake chamber of the low-pressure chamber structure.

[0018] In one embodiment, the housing is provided with:

[0019] The first air inlet is connected to the oil separator channel and the high-pressure chamber structure respectively;

[0020] The first exhaust port is connected to the outlet end of the oil separator channel;

[0021] The oil return port is connected to the right end of the oil separator channel; the first oil return channel is connected to the oil return port.

[0022] A filter assembly is installed at the oil return port.

[0023] In one embodiment, the filtering assembly includes: a filter body, wherein a mounting groove is provided within the filter body.

[0024] The filter screen is installed in the mounting slot;

[0025] The filter screen retaining ring is embedded in the mounting groove and abuts against and fixes the filter screen.

[0026] In one embodiment, a fourth sealing ring and a fifth sealing ring are provided on the outer wall of the filter body. The filter body is sealed to the side of the hole on the stationary disc assembly through the fourth sealing ring, and the filter body is sealed to the side of the oil return port through the fifth sealing ring.

[0027] In one embodiment, the housing includes: a motor housing and an exhaust cover detachably connected to the motor housing;

[0028] The stationary disc assembly includes: a stationary vortex disc, a high-pressure chamber structure formed between the stationary vortex disc and the exhaust cover, and a stationary vortex ring provided on the stationary vortex disc;

[0029] The first return oil passage is located on the stationary vortex plate;

[0030] The moving disk assembly includes: a moving scroll, on which a moving scroll ring is provided, and a stationary scroll ring and a moving scroll ring mesh to form a compression cavity, and both adopt symmetrical circular arc plus straight line correction scroll rings.

[0031] In one embodiment, the stationary disc assembly further includes an elastic ring disposed between the stationary volute disc and the exhaust cover, and causing the stationary volute disc to abut against the bearing housing assembly.

[0032] The first sealing ring is set in the groove of the raised round rib on the stationary volute and is used to seal the connection between the stationary volute and the exhaust cover.

[0033] In one embodiment, the bearing housing assembly includes: a bearing housing body and a pin mounting plate;

[0034] The moving scroll abuts against the pin mounting plate and forms a back pressure cavity within the bearing housing body, the pin mounting plate, and the moving scroll.

[0035] The scroll compressor also includes a second oil return passage, which has an oil inlet section and an oil outlet section. The oil inlet section connects the compression chamber and the back pressure chamber.

[0036] The oil outlet section connects the back pressure chamber and the intake chamber.

[0037] In one embodiment, the oil inlet section includes a back pressure hole disposed at the bottom of the moving scroll, the back pressure hole being connected to the compression chamber and the back pressure chamber respectively.

[0038] The oil outlet section includes: a second oil return hole provided on the outer side wall of the bearing housing body, and a flow channel gap formed between the outer side wall of the bearing housing assembly and the inner side wall of the motor housing. The second oil return hole connects the back pressure chamber and the flow channel gap, and the flow channel gap is connected to the suction chamber.

[0039] In one embodiment, the pin mounting plate is provided with six pin shafts, and the back of the moving scroll is provided with six pin mating holes. The pin shafts and the pin mating holes are mated to each other so that the pin shafts can move within the pin mating holes.

[0040] The end face of the moving scroll is sealed to the first end face of the pin mounting plate through the second sealing ring, and the second end face of the pin mounting plate is sealed to the end face of the bearing housing body through the third sealing ring.

[0041] The beneficial effects of the scroll compressor with a circulating lubrication oil circuit structure provided in this application are at least as follows: the mixture of refrigerant gas and lubricating oil first lubricates the friction pairs in the suction chamber, and then enters the compression chamber under the action of pressure difference. During this process, the lubricating oil lubricates the friction pairs between the stationary and moving disc assemblies. Under the compression action of the compression chamber, on the one hand, the lubricating oil enters the back pressure chamber through the oil inlet section of the second oil return channel to lubricate the friction pairs in the back pressure chamber, and then returns to the bottom oil sump in the suction chamber through the oil outlet section of the second oil return channel, realizing the circulation of lubricating oil. On the other hand, the refrigerant gas and lubricating oil are discharged from the compression chamber from the stationary scroll assembly and enter the high-pressure chamber structure. Moreover, when the lubricating oil enters the high-pressure chamber with the high-pressure gas, the lubricating oil is squeezed to the connection between the high-pressure chamber structure and the low-pressure chamber structure to achieve oil sealing, thereby sealing the leakage gap between the connection. The gas from the high-pressure chamber then enters the oil separator channel where oil-gas separation occurs. The separated lubricating oil enters the first return oil channel on the stationary vortex assembly, passes through the low-pressure chamber, and returns to the compressor's suction chamber, further returning to the bottom oil sump. The first and second return oil channels ensure lubricating oil circulation, providing excellent lubrication to all compressor components and improving compressor efficiency and stability. Simultaneously, because the diameter of the first return oil channel is smaller than that of the oil separator channel, the lubricating oil experiences a significant pressure drop after passing through the first return oil channel, changing from high pressure to low pressure, thus meeting the lubricating oil circulation requirements. Even when the oil content in the lubricating oil circuit is low under specific operating conditions, the lubricating oil will not be excessively returned in the return oil circulation path, preventing insufficient lubricating oil in other chambers. This ensures sufficient lubricating oil in each chamber, effectively sealing the gaps between chambers and preventing significant refrigeration leaks. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 A cross-sectional view of a scroll compressor with a circulating lubrication oil circuit structure provided in an embodiment of this application;

[0044] Figure 2 A cross-sectional view from another perspective of a first position of a scroll compressor with a circulating lubrication oil circuit structure provided in an embodiment of this application;

[0045] Figure 3An exploded view of a scroll compressor with a circulating lubrication oil circuit structure provided in this application embodiment;

[0046] Figure 4 A partial cross-sectional view of a scroll compressor with a circulating lubrication oil circuit structure at a second position, provided as an embodiment of this application;

[0047] Figure 5 A partial cross-sectional view of a scroll compressor with a circulating lubrication oil circuit structure at a third position, provided for an embodiment of this application;

[0048] Figure 6 A partial cross-sectional view of a scroll compressor with a circulating lubrication oil circuit structure at a fourth position, provided as an embodiment of this application;

[0049] Figure 7 A schematic diagram of the stationary scroll plate of a scroll compressor with a circulating lubrication oil circuit structure provided in an embodiment of this application;

[0050] Figure 8 A schematic diagram of the stationary scroll plate of a scroll compressor with a circulating lubrication oil circuit structure provided in an embodiment of this application;

[0051] Figure 9 A partial cross-sectional view at the fifth position of a scroll compressor with a circulating lubrication oil circuit structure provided for an embodiment of this application;

[0052] Figure 10 A partial cross-sectional view at the sixth position of a scroll compressor with a circulating lubrication oil circuit structure provided for an embodiment of this application;

[0053] Figure 11 A rear view of the moving scroll of a scroll compressor with a circulating lubrication oil circuit structure provided in an embodiment of this application;

[0054] Figure 12 This is a schematic diagram of the bearing housing body of a scroll compressor with a circulating lubrication oil circuit structure, provided as an embodiment of this application.

[0055] The following are the labeling elements in the figure:

[0056] 100. Housing; 110. Motor housing; 111. Intake chamber; 112. Oil sump; 113. Intake port; 120. Exhaust cover; 121. Low-pressure chamber structure; 122. High-pressure chamber structure; 123. Oil separator channel; 124. First air inlet; 125. First exhaust port; 126. Oil return port; 130. Filter assembly; 131. Filter body; 132. Filter screen; 133. Filter screen pressure ring; 134. Fourth sealing ring; 135. Fifth sealing ring; 200. Bearing housing assembly; 210. Back pressure chamber; 220. Bearing housing body; 230. Pin mounting plate; 231. Pin shaft; 232. First end face; 233. Second end face; 234. 300. Third sealing ring; 310. Stationary disc assembly; 311. Compression chamber; 312. Second air inlet; 313. Second exhaust port; 320. Stationary scroll; 321. Stationary scroll ring; 330. Elastic ring; 340. First sealing ring; 350. Filter mounting hole; 400. Moving disc assembly; 410. Moving scroll; 411. Moving scroll ring; 420. Pin mating hole; 430. Second sealing ring; 500. First oil return channel; 510. Inlet section; 520. Throttling groove section; 530. Outlet section; 540. Connecting hole section; 600. Second oil return channel; 610. Back pressure hole; 620. Second oil return hole; 630. Flow channel clearance; 700. Rotation mechanism. Detailed Implementation

[0057] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0058] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it may be directly or indirectly located on that other component. When a component is referred to as "connected to" another component, it may be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate orientations or positions based on the accompanying drawings, and are for ease of description only, and should not be construed as limiting the technical solution. 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 technical features. "A plurality" means two or more, unless otherwise explicitly defined.

[0059] Please see Figure 1 , Figure 2 , Figure 4This embodiment provides a scroll compressor with a circulating lubrication oil circuit structure. This scroll compressor can be a horizontal structure. For ease of structural description, the structure is described with the axial direction of the scroll compressor as the front-to-back direction. This scroll compressor mainly includes: a housing 100, a rotating mechanism 700, a moving disc assembly 400, a stationary disc assembly 300, and a first oil return channel 500. The housing 100 is provided with a suction chamber 111, a suction port 113, and an oil sump 112. The suction chamber 111 is connected to the suction port 113, allowing refrigerant gas to enter the suction chamber 111. The oil sump 112 is located within the suction chamber 111, allowing the refrigerant gas to mix with the lubricating oil in the oil sump 112. The rotating mechanism 700 is rotatably disposed within the housing 100. The moving disk assembly 400 is located within the housing 100 and eccentrically connected to the rotating mechanism. The stationary disk assembly 300 is fixedly disposed within the housing 100 and, together with the moving disk assembly 400, forms a compression chamber 310. The stationary disk assembly 300, driven by the rotating mechanism 700, performs eccentric movement, thereby changing the size of the compression chamber 310. The compression chamber 310 has a second air inlet 311 and a second air outlet 312. The second air inlet 311 connects to the intake chamber 111. When the size of the compression chamber 310 decreases, gas can be squeezed out of the compression chamber 310 through the second air outlet 312. When the size of the compression chamber 310 increases, gas can be absorbed from the intake chamber 111 through the second air inlet 311, thereby achieving the function of pumping gas. A high-pressure chamber structure 122, a low-pressure chamber structure 121, and an oil separator channel 123 are provided inside the housing 100. The second exhaust port 312 is connected to the high-pressure chamber structure 122, and the high-pressure chamber structure is connected to the oil separator channel 123. The oil separator channel 123 is used to separate oil and gas and allow the gas to enter the gas section and be discharged, while the lubricating oil enters the return oil section. The first return oil channel 500 is connected to the return oil section and the low-pressure chamber structure 121, and the low-pressure chamber structure 121 is connected to the suction chamber 111. The diameter of the first return oil channel 500 is smaller than the diameter of the oil separator channel 123, so that the high-pressure lubricating oil in the oil separator channel 123 is depressurized when it passes through the first return oil channel 500, thereby reducing the pressure of the lubricating oil flowing into the low-pressure chamber structure 121.

[0060] Please see Figure 1 , Figure 2 as well as Figure 9 In this embodiment, a bearing housing assembly 200 is provided inside the housing 100. The bearing housing assembly 200 and the motor housing 110 form an intake chamber 111, and an oil sump 112 is located within the intake chamber 111. The bearing housing assembly 200 and the moving disc assembly 400 form a back pressure chamber 210, within which bearings and other components supporting the rotating assembly are provided. The scroll compressor also includes a second oil return channel 600, which has an oil inlet section and an oil outlet section. The oil inlet section connects the compression chamber 310 and the back pressure chamber 210; the oil outlet section connects the back pressure chamber 210 and the intake chamber 111.

[0061] Please see Figure 2 , Figures 4-6 , Figures 9-10 The mixture of refrigerant gas and lubricating oil first lubricates the friction pair in the suction chamber 111, and then enters the compression chamber 310 formed by the stationary disk assembly 300 and the moving disk assembly 400 under the action of pressure difference. Driven by the eccentric movement of the moving disk assembly 400, it is forced to flow from the outside of the compression chamber 310 to the center. During this process, the lubricating oil plays the role of lubricating the friction pair between the stationary disk assembly 300 and the moving disk assembly 400. Under the squeezing action of the compression chamber 310, the lubricating oil enters the back pressure chamber 210 through the oil inlet section of the second oil return channel 600 to lubricate the friction pair in the back pressure chamber 210, and then returns to the bottom oil pool 112 of the suction chamber through the oil outlet section of the second oil return channel 600 to realize the circulation of lubricating oil. On the other hand, when the refrigerant gas and lubricating oil reach the discharge pressure, they are discharged from the stationary scroll 320 into the compression chamber 310 and enter the high-pressure chamber structure 122. Furthermore, when the lubricating oil enters the high-pressure chamber along with the high-pressure gas, it is squeezed to the connection between the high-pressure chamber structure 122 and the low-pressure chamber structure 121, thus achieving an oil seal and sealing the leakage gap between the connection points. The gas in the high-pressure chamber structure 122 then enters the oil separator channel 123 where oil-gas separation occurs. The refrigerant is discharged from the discharge end of the oil separator channel 123 to the outside of the compressor, while the lubricating oil enters from the return section of the oil separator channel 123 into the first return oil channel 500 on the stationary scroll assembly and then into the low-pressure chamber structure 121. Because the diameter of the first oil return channel 500 is much smaller than that of the oil separator channel 123, the lubricating oil undergoes a significant pressure drop after passing through the first oil return channel 500, changing from high pressure to low pressure. After passing through the low-pressure chamber structure 121, it returns to the compressor's suction chamber 111 and further returns to the bottom oil sump 112, thus completing another complete cycle of the lubricating oil. The first oil return channel 500 and the second oil return channel 600 achieve the required lubricating oil circulation, resulting in good lubrication of all compressor components and improving the compressor's operating efficiency and stability. Simultaneously, due to the smaller diameter of the first oil return channel 500, even when the oil content in the lubricating oil circuit is low under specific operating conditions, the lubricating oil will not be excessively returned in the oil return circulation path, preventing insufficient lubricating oil in other chambers. This ensures sufficient lubricating oil in each chamber, effectively sealing the gaps between chambers and preventing significant refrigeration leaks.

[0062] The specific structure of this embodiment is as follows:

[0063] Please see Figure 1 , Figure 2The scroll compressor provided in this embodiment has a horizontal structure. The rotating mechanism 700, the stationary disc assembly 300, the moving disc assembly 400 and the bearing housing assembly 200 are all located inside the housing 100. The suction chamber 111 and the oil sump 112 are located at the rear inside the housing 100. The stationary disc assembly 300 is located at the front inside the housing 100. The moving disc assembly 400 is located between the stationary disc assembly 300 and the bearing housing assembly 200. The rear end of the rotating mechanism 700 is located inside the suction chamber 111, and the front end passes through the bearing housing assembly 200 and connects to the stationary disc assembly 300.

[0064] Please see Figures 1 to 3 The housing 100 mainly includes a motor housing 110 and an exhaust cover 120. The motor housing 110 and the exhaust cover 120 are detachably connected to the front of the motor housing 110 by bolts. The intake chamber 111 is located inside the motor housing 110. A groove is provided at the bottom of the intake chamber 111 inside the motor housing 110 to form an oil sump 112. An intake port 113 is provided on the motor housing 110. The intake port 113 is connected to the intake chamber 111 and is used for the entry of refrigerant gas. The bearing housing assembly 200 specifically includes: a bearing housing body 220 and a pin mounting plate 230; the bearing housing body 220 is located behind the pin mounting plate 230, and a bearing is provided inside the bearing housing body 220, which is connected to the rotating mechanism 700. The pin mounting plate 230 is located between the moving plate assembly 400 and the bearing housing body 220, and the moving plate assembly 400 abuts against the pin mounting plate 230, forming a back pressure cavity 210 within the bearing housing body 220, the pin mounting plate 230, and the moving plate assembly 400.

[0065] Please see Figure 2 , Figure 3 as well as Figure 6 In this embodiment, the stationary disc assembly 300 is located on the front side of the exhaust cover 120. The stationary disc assembly 300 includes a stationary volute 320, a filter assembly 130, an elastic ring 330, and a first sealing ring 340. The front end face of the stationary volute 320 is provided with a filter mounting hole 350 and a protruding raised rib. The filter assembly 130 is located in the filter mounting hole 350 on the front end face of the stationary volute 320. The first sealing ring 340 is located in the groove on the outer wall of the raised rib on the stationary volute 320. The elastic ring 330 can be a spring ring, which is installed between the stationary volute 320 and the exhaust cover 120. The spring force of the spring ring causes the stationary volute 320 to abut against the bearing seat assembly 200.

[0066] Please see Figure 2 , Figure 3 as well as Figure 9 In this embodiment, the moving disk assembly 400 includes a moving scroll 410 and a second sealing ring 430; a stationary scroll 320 is provided with a stationary scroll ring 321 (e.g., Figure 8 The moving scroll 410 is equipped with a moving scroll ring 411 (e.g., Figure 3 The stationary scroll 320 encloses the moving scroll 410, which can move within the stationary scroll 320. The stationary scroll 321 and the moving scroll 411 mesh to form a compression chamber 310. The moving scroll 410 is driven by the rotating mechanism 700, thereby causing the compression chamber 310 to expand or contract. The outer surface of the stationary scroll 320 is provided with air holes and oil holes. The air hole is a second air inlet 311 connected to the suction chamber 111, and the oil hole is connected to the oil sump 112. When the compression chamber 310 expands, the pressure inside the compression chamber 310 is low, allowing refrigerant gas and lubricating oil to enter the outer part of the compression chamber 310 through the second air inlet 311 and the oil hole. When the moving scroll 410 moves and the compression chamber 310 shrinks, the gas and lubricating oil are forced to flow from the outside of the compression chamber 310 towards the center, increasing the pressure inside the compression chamber 310. In this embodiment, both the stationary volute 321 and the moving volute 411 adopt symmetrical circular arcs with straight-line correction, which results in good meshing and stable operation. The end face of the moving volute 410 is sealed by the second sealing ring 430 and the first end face 232 of the pin mounting plate 230, which can seal the back pressure cavity 210 and prevent air leakage from the connection.

[0067] like Figure 2 , Figure 8 As shown, the second exhaust port 312 is located in the middle of the stationary vortex plate 320. The second exhaust port 312 is usually equipped with a valve structure. When the pressure in the compression chamber 310 is low, the compression chamber 310 is closed. When the pressure reaches a preset pressure value (e.g., a certain high pressure), the valve is opened, so that gas and liquid can enter the high pressure chamber structure 122 through the second exhaust port 312.

[0068] Please see Figure 1 , Figure 4 In this embodiment, the oil separation channel 123, the high-pressure chamber structure 122, and the low-pressure chamber structure 121 are disposed on the exhaust cover 120. The oil separation channel 123 is connected to the first air inlet 124 and has an oil outlet end and an air outlet end. The air outlet end is connected to the first exhaust port 125, and the oil outlet end is connected to the oil return port 126. The high-pressure chamber structure 122 is located in the middle of the exhaust cover 120 and is connected to the oil separation channel 123 through the first air inlet 124. The oil return port 126 is connected to the first oil return channel 500, and then to the low-pressure chamber structure 121. The low-pressure chamber structure 121 is located at the edge of the exhaust cover 120 and is connected to the intake chamber 111. The high-pressure gas generated in the compression chamber 310 enters the high-pressure chamber structure 122, and enters the oil separation channel 123 through the first air inlet 124 for oil-gas separation. The refrigerant gas enters the first exhaust port 125 through the air outlet, and can then be discharged outside the compressor. The separated lubricating oil enters the oil return port 126 from the oil outlet and enters the first oil return channel 500.

[0069] Please see Figures 4-6 as well as Figure 7 and Figure 8 The first oil return channel 500 specifically includes an inlet section 510, a throttling groove section 520, and an outlet section 530. The inlet section 510 penetrates the stationary scroll 320 along the front-to-back direction and connects to the oil distribution channel 123. The throttling groove section 520 is arranged around the end face of the stationary scroll 320 and connects to the inlet section 510. The rear end face of the stationary scroll 320 and the bearing housing assembly 200 are mutually pressed together by the pre-deformation of the elastic ring 330. The elastic ring 330 exerts a certain force on the stationary scroll 320, thereby achieving a side seal on the throttling groove section 520 and forming a channel in the throttling groove section 520. This facilitates the effective throttling and pressure reduction effect of the lubricating oil in the throttling groove section 520. At the same time, because the cross-sectional size of the throttling groove section 520 is particularly small, even if the oil content in the oil circuit is small under certain operating conditions, there will be no large refrigeration leakage. The outlet section 530 passes through the stationary disc assembly 300 and connects to the low-pressure chamber structure 121 and the throttling groove section 520. The inlet section 510 of the first oil return channel 500 is connected to the oil return port 126 on the exhaust cover 120 via the filter assembly 130, and the outlet section 530 of the first oil return channel 500 is connected to the low-pressure chamber structure 121 on the exhaust cover 120. When the lubricating oil passing through the oil return port 126 is filtered by the filter assembly 130, the filtered lubricating oil sequentially enters the inlet section 510, the throttling groove section 520, and the outlet section 530, finally reaching the low-pressure chamber structure 121, and then returning to the intake chamber 111 via the second air inlet 311. The diameters of the inlet section 510, the throttling groove section 520, and the outlet section 530 are all smaller than the oil outlet end of the oil separator channel 123. Therefore, a significant pressure drop can occur within the first oil return channel 500. In particular, the throttling groove section 520 is grooved on the end face to form a semi-circular channel, which greatly reduces the diameter and thus achieves a good throttling and pressure reduction effect.

[0070] Please see Figure 5 A connecting hole section 540 is also provided through the stationary vortex disk 320. The connecting hole section 540 passes through the stationary vortex disk 320 in the front-back direction. The connecting hole section 540 connects the low-pressure chamber structure 121 and the inner edge space of the stationary vortex disk 320 (this edge space can also be considered as part of the compression chamber 310, but it is located at the edge of the compression chamber 310. When the compression chamber 310 is compressed, the middle position is compressed to generate high pressure, while the edge does not generate high pressure). It is then connected to the intake chamber 111 through the second air inlet 311 on the side wall of the stationary vortex disk 320.

[0071] Please see Figure 4The filter assembly 130 includes a filter body 131, a filter screen 132, a filter screen retaining ring 133, a fourth sealing ring 134, and a fifth sealing ring 135. The filter screen 132 is located inside the filter body 131 and is pressed and fixed by the filter screen retaining ring 133. The fourth sealing ring 134 is located in a first deep groove on the outer wall of the filter body 131, and the filter body 131 is sealed to the side of the filter mounting hole 350 on the stationary disc assembly 300 through the fourth sealing ring 134. The fifth sealing ring 135 is located in a second deep groove on the outer wall of the filter body 131, and the filter body 131 is sealed to the side of the oil return port 126 through the fifth sealing ring 135. The outer wall surface of the stationary volute 320 mates with the inner wall surface of the exhaust cover 120, which serves to circumferentially position the stationary volute 320.

[0072] The filter assembly 130 not only filters the lubricating oil but also blocks and buffers high-pressure lubricating oil, further achieving the function of throttling and reducing pressure.

[0073] Please see Figure 2 , Figure 3 , Figure 9 as well as Figure 11 In this embodiment, the bearing housing assembly 200 further includes six pin shafts 231 and a third sealing ring 234. The bearing housing can be snapped into the motor housing 110. The pin shafts 231 are mounted on the front end face of the pin mounting plate 230. Six holes are evenly distributed around the front end face of the pin mounting plate 230, and the six pin shafts 231 are respectively embedded in the six holes. The rear end face (back) of the moving scroll 410 is provided with six pin mating holes 420. The pin shafts 231 and the pin mating holes 420 cooperate with each other so that the pin shafts 231 can move within the pin mating holes 420. Since the moving scroll 410 rotates eccentrically, it can move within the pin mating holes 420 through the drive of the rotation mechanism, thereby making the compression chamber 310 larger or smaller.

[0074] In this embodiment, the end face of the moving scroll 410 is sealed with the first end face 232 of the pin mounting plate 230 through the second sealing ring 430, and the second end face 233 of the pin mounting plate 230 is sealed with the end face of the bearing seat through the third sealing ring 234, thereby sealing the front end of the bearing seat assembly 200 and forming a back pressure cavity 210 inside the bearing seat assembly 200.

[0075] Please see Figure 9 , Figure 10 as well as Figure 12In this embodiment, the second oil return channel 600 has the following specific structure: the oil inlet section includes a back pressure hole 610 located at the bottom of the moving scroll 410, which is connected to the compression chamber 310 and the back pressure chamber 210. The oil outlet section includes a second oil return hole 620 located on the outer side wall of the bearing housing body 220, and a flow channel gap 630 formed between the outer side wall of the bearing housing body 220 and the inner side wall of the motor housing 110. The second oil return hole 620 connects the back pressure chamber 210 and the flow channel gap 630, and the flow channel gap 630 is connected to the suction chamber 111. A back pressure hole 610 is provided at the bottom of the moving scroll 410. The back pressure hole 610 is located near the center of the moving scroll 410 and extends through the moving scroll 410 in the front-to-back direction, so that the back pressure hole 610 is connected to the compression chamber 310 and the back pressure chamber 210 respectively. The diameter of the back pressure hole 610 can be set to 1mm. The flow channel gap 630 formed between the outer wall of the bearing housing assembly and the inner wall of the motor housing 110 is also set to be relatively small, for example, a micro gap of 0.2mm. The high-pressure lubricating oil flowing out of the compression chamber 310 is throttled and depressurized through the back pressure hole 610 on the bearing housing body 220, so as to enter the back pressure chamber 210 to lubricate the friction pairs. After passing through the second oil return hole 620 and the micro flow channel gap 630, it is throttled and depressurized again, and then returns to the bottom oil sump 112.

[0076] Please see Figure 1 , Figures 4-6 , Figure 9 and Figure 10 The following is a method for using the oil return function of a scroll compressor provided in this embodiment:

[0077] To ensure the normal operation of the scroll compressor, a certain amount of lubricating oil is pre-injected into the bottom oil sump 112 inside the casing 100. Initially, the injected lubricating oil accumulates in the oil sump 112 at the bottom of the casing 100. When the scroll compressor is running, refrigerant gas from the evaporator enters the suction chamber 111 through the suction port 113. Driven by the swirling refrigerant gas flow, some of the lubricating oil in the bottom oil sump 112 is carried by the refrigerant, forming an oil-gas mixture, which flows within the designated flow channel inside the casing cavity. First, as the refrigerant and lubricating oil mixture flows through the internal space of the casing 100, it carries the lubricating oil to the secondary bearing for necessary lubrication. Secondly, the mixture of refrigerant gas and lubricating oil enters the compressor compression chamber 310 formed by the stationary scroll 320 and the moving scroll 410 under the action of pressure difference. Driven by the rotating mechanism 700, the moving scroll 410 moves and contracts the compression space, thereby forcing the oil-gas mixture to flow from the edge of the scroll towards the center. In this process, the lubricating oil not only lubricates the friction pair between the moving scroll 410 and the stationary scroll 320, but also seals the leakage gap between the high and low pressure chambers. Then the oil circuit splits into two paths. In one path, the lubricating oil, along with the refrigerant gas, enters the back pressure chamber 210 formed by the moving scroll 410 and the bearing housing assembly 200 through the back pressure hole 610, lubricating the friction pair in the back pressure chamber 210. Afterward, it undergoes a throttling pressure drop through the back pressure hole 610 and the tiny flow channel gap 630 on the bearing housing assembly 200, and returns to the oil sump 112 at the bottom of the compressor housing 100. In the other path, when the refrigerant gas and lubricating oil reach the discharge pressure in the compression chamber 310, they are discharged from the second discharge port on the stationary scroll 320 and enter the high-pressure chamber structure 122 on the discharge cover 120. Then, the mixture enters the oil separator channel 123 through the air inlet on the discharge cover 120, where oil-gas separation occurs. The separated refrigerant is discharged from the first discharge port 125, while the lubricating oil enters the return oil port 126 from the oil separator channel 123 and flows through the filter assembly 130, which filters out impurities in the lubricating oil and also achieves a partial throttling and pressure reduction effect. Then, it passes through the inlet section 510, the throttling groove section 520, and the outlet section 530 of the first return oil channel 500 in sequence. A significant pressure drop occurs, especially in the throttling groove section 520. Then, it enters the low-pressure chamber structure 121 on the discharge cover 120 and finally returns to the compressor suction chamber 111 through the connecting hole section 540, and further returns to the bottom oil sump 112, thus completing a complete cycle of the lubricating oil.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A scroll compressor with a circulating lubrication oil circuit structure, characterized in that, include: The housing contains a bearing housing assembly, and an air intake chamber and an oil sump are formed on one side of the bearing housing assembly. A static disk assembly is fixedly disposed within the housing; A moving disk assembly, which rotates eccentrically relative to the stationary disk assembly and is matched with the moving disk assembly to form a compression chamber, the compression chamber being connected to the intake chamber; The housing has a low-pressure chamber structure, a high-pressure chamber structure, and an oil separation channel; the high-pressure chamber structure connects the compression chamber and the oil separation channel. The scroll compressor further includes a first oil return channel and a second oil return channel; The first oil return channel connects the oil separator channel and the low-pressure chamber structure, and the low-pressure chamber structure connects the air intake chamber. The diameter of the first oil return channel is smaller than the diameter of the oil separator channel. The bearing housing assembly and the moving disk assembly form a back pressure chamber. The second oil return channel has an oil inlet section and an oil outlet section. The oil inlet section connects the compression chamber and the back pressure chamber, and the oil outlet section connects the back pressure chamber and the suction chamber. The first oil return channel includes an inlet section that passes through the stationary plate assembly and connects to the oil separator channel; A throttling groove section is arranged around the end face of the stationary disc assembly and connects to the inlet section; The outlet section extends through the stationary disc assembly and connects the low-pressure chamber structure and the throttling groove section; The static disk assembly is also provided with a through-hole section, which connects to the intake chamber of the low-pressure chamber structure. The housing is provided with: The first air inlet is connected to the oil separator channel and the high-pressure chamber structure respectively; The first exhaust port is connected to the outlet end of the oil separator channel; An oil return port is connected to the oil outlet of the oil separator channel, and the first oil return channel is connected to the oil return port. A filter assembly is installed at the oil return port; The filter assembly includes: a filter body, wherein a mounting groove is provided within the filter body. The filter screen is installed in the mounting slot; A filter screen retaining ring is embedded in the mounting groove and abuts against and fixes the filter screen. The front end face of the static disk assembly is provided with a filter mounting hole, and the filter assembly is located in the filter mounting hole; The oil inlet section includes a back pressure hole disposed at the bottom of the moving disc assembly, and the back pressure hole is connected to the compression chamber and the back pressure chamber respectively; The oil outlet section includes: a second oil return hole provided on the outer side wall of the bearing housing body, and a flow channel gap formed between the outer side wall of the bearing housing assembly and the inner side wall of the motor housing. The second oil return hole connects the back pressure chamber and the flow channel gap, and the flow channel gap connects the suction chamber.

2. The scroll compressor having a circulating lubricating oil passage structure according to claim 1, wherein The filter body is provided with a fourth sealing ring and a fifth sealing ring on its outer wall. The filter body is sealed to the side of the hole on the stationary disc assembly through the fourth sealing ring, and the filter body is sealed to the side of the oil return port through the fifth sealing ring.

3. The scroll compressor having a circulating lubricating oil passage structure according to claim 1, wherein The housing includes: a motor housing and an exhaust cover detachably connected to the motor housing; The stationary disc assembly includes: a stationary vortex disc, the high-pressure chamber structure being formed between the stationary vortex disc and the exhaust cover, and a stationary vortex ring being provided on the stationary vortex disc; The first oil return channel is located on the stationary vortex plate; The moving disk assembly includes: a moving scroll, on which a moving scroll ring is provided, and the stationary scroll ring and the moving scroll ring mesh to form a compression cavity, and both adopt symmetrical circular arc plus straight line correction scroll rings.

4. The scroll compressor having a circulating lubricating oil passage structure according to claim 3, said fixed plate assembly further comprising: An elastic ring is disposed between the stationary vortex disk and the exhaust cover, and the stationary vortex disk abuts against the bearing housing assembly; The first sealing ring is disposed in the groove of the raised circular rib on the stationary vortex disk and is used to seal the connection between the stationary vortex disk and the exhaust cover.

5. The scroll compressor having a circulating lubricating oil passage structure according to claim 3, wherein The bearing housing assembly includes: a bearing housing body and a pin mounting plate; The moving scroll abuts against the pin mounting plate and forms a back pressure cavity within the bearing housing body, the pin mounting plate, and the moving scroll.

6. The scroll compressor having a circulating lubricating oil passage structure according to claim 5, wherein The pin mounting plate is provided with six pin shafts, and the back of the moving scroll is provided with six pin mating holes. The pin shafts and the pin mating holes are mated to each other so that the pin shafts can move within the pin mating holes. The end face of the moving scroll is sealed to the first end face of the pin mounting plate through a second sealing ring, and the second end face of the pin mounting plate is sealed to the end face of the bearing housing body through a third sealing ring.

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