Oil return assembly and electric scroll compressor

Abstract

The invention relates to the technical field of scroll compression, in particular to an oil return assembly and an electric scroll compressor. The oil return assembly comprises an oil return channel, a main machine frame and a static vortex plate. A first air suction channel and a second air suction channel are further arranged on the main machine frame, the first air suction channel is communicated with an air suction cavity of the static vortex plate, and the second air suction channel is communicated with an air suction cavity of the dynamic vortex plate. One end of the first oil outlet groove communicates with the first air suction channel, and the other end communicates with the bearing chamber; the other end of the second oil outlet groove is communicated with the bearing chamber; and the other end of the connecting oil duct is respectively communicated with the first oil outlet groove and the second oil outlet groove. The structure is simple, oil return is reliable, lubrication of the main bearing and the upper half portion of the vortex is improved, the sealing performance of the vortex portion is improved, the reliability of the vortex component is improved, and therefore the performance and reliability of the whole compressor are improved.

Description

Technical Field

[0001] The invention relates to the technical field of scroll compression, and in particular to an oil return component and an electric scroll compressor. Background Art

[0002] The scroll compressor is a positive displacement compressor with high efficiency, low noise and smooth operation. During the operation of the scroll compressor, refrigerant oil is needed to seal the scroll compressor pump body components to improve the volumetric efficiency of the compressor. At the same time, the friction pair is lubricated to avoid the wear of the transmission components caused by the lack of oil in the compressor and improve the reliability of the compressor. In the prior art, a throttling structure is often used to lubricate the compression chamber and the friction pair through the oil return passage of the refrigerant oil separated by the oil separation structure on the high-pressure side. Specifically, the high-temperature and high-pressure oil-gas mixed fluid discharged by the static scroll is separated by the oil separation tube, and the gas is discharged from the exhaust port of the top cover, while the refrigerant oil passes through the oil return passage of the static scroll, and after throttling and reducing the pressure through the oil return micro-passage on the wear-resistant plate, it finally returns to the suction chamber on the back of the static scroll through the oil return passage of the static scroll, thereby affecting the performance and reliability of the compressor.

[0003] Because of this structure, the refrigerant oil directly enters the low-pressure chamber of the compressor without reaching the main bearing and the dynamic plate drive bearing. Moreover, the refrigerant oil reaching the low-pressure chamber cannot control the amount of oil entering the compression chamber, which also makes the lubrication and sealing effect of the entire compressor scroll part worse. Summary of the invention

[0004] Objectives of the present invention include, for example, providing an oil return assembly and an electric scroll compressor, which can timely and efficiently lubricate the main bearing, the moving plate drive bearing and the scroll portion.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, the present invention provides an oil return assembly, comprising:

[0007] Oil return channel, main frame, static vortex plate;

[0008] A bearing chamber is provided at the center of the main frame; a first air intake passage and a second air intake passage are also provided on the main frame, and both the first air intake passage and the second air intake passage penetrate the main frame along the axial direction of the main frame; the first air intake passage is communicated with the air intake cavity of the fixed scroll, and the second air intake passage is communicated with the air intake cavity of the movable scroll; the fixed scroll is hermetically arranged on the top of the main frame;

[0009] The oil return channel includes an oil return groove, a connecting oil channel, a first oil outlet groove and a second oil outlet groove; the oil return groove is connected to the outlet of the oil return channel of the fixed scroll;

[0010] One end of the first oil outlet groove is connected to the first air intake duct, and the other end is connected to the bearing chamber; one end of the second oil outlet groove is connected to the second air intake duct, and the other end is connected to the bearing chamber; one end of the connecting oil channel is connected to the oil return groove, and the other end is connected to the first oil outlet groove and the second oil outlet groove respectively.

[0011] In an optional embodiment, the connecting oil passage includes a first oil passage and a second oil passage;

[0012] Along the circumferential direction of the main frame, the first oil passage and the second oil passage are respectively located on both sides of the oil return groove; the two ends of the first oil passage are respectively connected to the oil return groove and the first air intake passage, and the two ends of the second oil passage are respectively connected to the oil return groove and the second air intake passage;

[0013] Along the circumferential direction of the main frame, the width of the first oil passage is d1, and the width of the second oil passage is d2; d2=d1.

[0014] In an optional embodiment, the connecting oil passage includes a first oil passage and a second oil passage;

[0015] Along the circumferential direction of the main frame, the first oil passage is located at one side of the oil return groove; two ends of the first oil passage are respectively connected to the oil return groove and the first air intake passage, and two ends of the second oil passage are respectively connected to the first air intake passage and the second air intake passage;

[0016] Along the circumferential direction of the main frame, the width of the first oil passage is d1, and the width of the second oil passage is d2; d2≥d1.

[0017] In an optional embodiment, the first oil passage and the second oil passage both extend in an arc shape along the center of the main frame;

[0018] Along the radial direction of the main frame, the first oil passage, the second oil passage and the center of the main frame are at the same distance.

[0019] In an optional embodiment, the first oil outlet groove and the second oil outlet groove are both arranged on the end surface of the main frame close to the fixed scroll.

[0020] In an optional embodiment, the oil return groove, the connecting oil passage, the first oil outlet groove and the second oil outlet groove are all arranged on the end surface of the main frame close to the fixed scroll.

[0021] In an optional embodiment, it further includes a first wear-resistant sheet;

[0022] The first wear-resistant plate is sealed between the main frame and the static scroll; the first wear-resistant plate has a matching channel, the top surface of the matching channel is connected to the outlet of the oil return channel of the static scroll, and the bottom surface of the matching channel is connected to the oil return groove.

[0023] In an optional embodiment, a second wear-resistant sheet is further included;

[0024] The second wear-resistant sheet is hermetically arranged between the first wear-resistant sheet and the main frame; the oil return groove and the connecting oil passage are both opened through the second wear-resistant sheet.

[0025] In an optional embodiment, a throttle pin is also included;

[0026] The throttle pin is arranged at the outlet of the oil return channel of the fixed scroll.

[0027] In a second aspect, the present invention provides an electric scroll compressor, comprising an oil return assembly according to any one of the aforementioned embodiments.

[0028] The beneficial effects of the embodiments of the present invention include, for example:

[0029] The oil return assembly of this scheme includes an oil return channel, a main frame, and a static scroll. The main frame is provided with a first suction channel connected to the suction chamber of the static scroll, and a second suction channel connected to the suction chamber of the movable scroll. The oil return channel can guide the refrigerant oil from the oil return channel of the static scroll to the bearing chamber, the suction chamber of the movable disk, and the suction chamber of the static scroll respectively, and the bearing chamber is directly opposite to the compression chamber between the static scroll and the movable scroll, thus completing the lubrication operation of the main bearing, the movable disk drive bearing, and the compression chamber. In summary, such an oil return assembly has a simple structure and is easy to set up, which can significantly improve the lubrication effect of the scroll compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 This is a schematic diagram of the assembly of the oil return assembly according to the first embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the main frame structure of the oil return assembly of the first embodiment of the invention;

[0033] Figure 3It is a structural schematic diagram of another implementation mode of the main frame of the oil return assembly of the first embodiment of the invention;

[0034] Figure 4 This is a schematic diagram of the assembly of the oil return assembly according to the second embodiment of the present invention;

[0035] Figure 5 It is a schematic structural diagram of the oil return assembly of the second embodiment of the present invention.

[0036] Icons: 10-oil return assembly; 100-oil return channel; 110-oil return tank; 120-connecting oil channel; 121-first oil channel; 122-second oil channel; 131-first oil outlet tank; 132-second oil outlet tank; 200-main frame; 210-bearing chamber; 221-first air intake channel; 222-second air intake channel; 300-static vortex; 310-oil return channel; 400-throttling pin; 510-first wear-resistant plate; 511-matching channel; 520-second wear-resistant plate; 21-top cover; 22-oil separation pipe; 23-return oil filter. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0042] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0043] The high-temperature and high-pressure oil-gas mixed fluid discharged by the static scroll in the prior art is separated by the oil separation tube, and the gas is discharged from the exhaust port of the top cover, while the refrigeration oil passes through the oil return passage of the static scroll, is throttled and reduced in pressure by the oil return micro-passage on the wear-resistant plate, and finally returns to the suction chamber on the back of the static scroll through the oil return passage of the static scroll.

[0044] Because of this structure, the refrigerant oil directly enters the low-pressure chamber of the compressor without reaching the main bearing and the dynamic plate drive bearing. The main bearing and the drive bearing cannot be effectively lubricated, especially when the compressor is running at high speed and heavy load, the bearing may wear out, thus causing the compressor to fail.

[0045] Furthermore, the refrigeration oil reaching the low-pressure chamber cannot control the amount of oil entering the compression chamber, which also deteriorates the lubrication and sealing effects of the entire compressor scroll portion, thereby affecting the performance and reliability of the compressor.

[0046] When the compressor is running, the refrigerant oil sucked into the compression chamber will gather in the lower part of the scroll compression chamber under the action of gravity. The lubricating oil in the compression chamber above the scroll is less distributed. When running at high speed or high load, the upper part is prone to abnormal wear due to the lack of refrigerant oil, resulting in failure of the compressor.

[0047] In order to improve the above technical problems, an oil return assembly and an electric scroll compressor are provided in the following embodiments.

[0048] Embodiment 1

[0049] Please refer to Figure 1 , this embodiment provides an oil return assembly 10, including an oil return channel 100, a main frame 200, and a static scroll 300;

[0050] A bearing chamber 210 is provided at the center of the main frame 200; a first air intake passage 221 and a second air intake passage 222 are also provided on the main frame 200, and both the first air intake passage 221 and the second air intake passage 222 penetrate the main frame 200 along the axial direction of the main frame 200; the first air intake passage 221 is communicated with the air intake cavity of the fixed scroll 300, and the second air intake passage 222 is communicated with the air intake cavity of the movable scroll; the fixed scroll 300 is hermetically arranged on the top of the main frame 200;

[0051] The oil return channel 100 includes an oil return groove 110, a connecting oil channel 120, a first oil outlet groove 131 and a second oil outlet groove 132; the oil return groove 110 is connected to the outlet of the oil return channel 310 of the fixed scroll 300;

[0052] One end of the first oil outlet groove 131 is connected to the first air intake duct 221, and the other end is connected to the bearing chamber 210; one end of the second oil outlet groove 132 is connected to the second air intake duct 222, and the other end is connected to the bearing chamber 210; one end of the connecting oil channel 120 is connected to the oil return groove 110, and the other end is connected to the first oil outlet groove 131 and the second oil outlet groove 132 respectively.

[0053] The main frame 200 of the oil return assembly 10 of this solution is provided with a first air intake passage 221 connected to the air intake chamber of the fixed scroll 300 and a second air intake passage 222 connected to the air intake chamber of the movable scroll. The oil return passage 100 can guide the refrigeration oil from the oil return hole 310 of the fixed scroll 300 to the bearing chamber 210, the air intake chamber of the movable scroll, and the air intake chamber of the fixed scroll 300 respectively, and the bearing chamber 210 is directly opposite to the compression chamber between the fixed scroll 300 and the movable scroll, thus completing the lubrication operation of the main bearing, the movable disk drive bearing, and the compression chamber.

[0054] Please continue reading Figure 1 , Figure 2 and Figure 3 , to understand more structural details of the oil return assembly 10. As can be seen from the figure, the connecting oil passage 120 includes a first oil passage 121 and a second oil passage 122; along the circumferential direction of the main frame 200, the width of the first oil passage 121 is d1, and the width of the second oil passage 122 is d2. Along the radial direction of the main frame 200, the first oil outlet groove 131 and the second oil outlet groove 132 are located on one side of the main frame 200, and the oil return groove 110 is located on the other side of the main frame 200.

[0055] from Figure 1 and Figure 2 It can be seen that in an optional embodiment, the oil return groove 110, the connecting oil passage 120, the first oil outlet groove 131 and the second oil outlet groove 132 are all arranged on the end surface of the main frame 200 close to the fixed scroll 300. That is, the oil return channel 100 here is arranged on the end surface of the main frame 200.

[0056] In an optional embodiment, along the circumferential direction of the main frame 200, the first oil channel 121 and the second oil channel 122 are respectively located on both sides of the oil return groove 110; the two ends of the first oil channel 121 are respectively connected to the oil return groove 110 and the first air intake channel 221, and the two ends of the second oil channel 122 are respectively connected to the oil return groove 110 and the second air intake channel 222; and d2=d1.

[0057] Specifically, the first oil outlet groove 131 and the second oil outlet groove 132 are both arranged on the end surface of the main frame 200 close to the fixed scroll 300, and the oil return effect is good. The first oil channel 121 and the second oil channel 122 are respectively arranged on the left and right sides of the oil return groove 110, so that the oil can flow back to the first suction channel 221 from the oil return hole 310 of the fixed scroll 300, the oil return groove 110, the first oil channel 121, and the first oil outlet groove 131, and flow back to the second suction channel 222 from the oil return hole 310 of the fixed scroll 300, the oil return groove 110, the second oil channel 122, and the second oil outlet groove 132, so that the refrigeration oil flows out from the oil outlet groove of the main frame 200 under the suction action of the compressor. The first oil outlet groove 131 and the second oil outlet groove 132 are arranged along the radial direction of the main frame 200, and one end is connected to the bearing chamber 210 of the main frame 200, and the other end is connected to the intake duct of the main frame 200, which is beneficial to improve the lubrication of the main bearing and the upper half of the scroll.

[0058] Further, in an optional embodiment, the first oil passage 121 and the second oil passage 122 both extend in an arc shape along the center of the main frame 200; along the radial direction of the main frame 200, the first oil passage 121 and the second oil passage 122 are at the same distance from the center of the main frame 200. That is, the first oil passage 121 and the second oil passage 122 are both concentrically arranged, thus ensuring that the oil can flow evenly and smoothly to the first oil outlet groove 131 and the second oil outlet groove 132 respectively.

[0059] In an optional embodiment, the oil return assembly 10 further includes a first wear-resistant sheet 510; the first wear-resistant sheet 510 is hermetically disposed between the main frame 200 and the fixed scroll 300; the first wear-resistant sheet 510 has a matching hole 511, the top surface of the matching hole 511 is connected to the outlet of the oil return hole 310 of the fixed scroll 300, and the bottom surface of the matching hole 511 is connected to the oil return groove 110. That is, at this time, the first wear-resistant sheet 510 and the main frame 200 are enclosed so that the oil return groove 110, the connecting oil channel 120, the first oil outlet groove 131 and the second oil outlet groove 132 are channels with closed peripheral walls. Thereby, the airtightness of the oil return channel 100 is ensured.

[0060] In an optional embodiment, the oil return assembly 10 further includes a throttle pin 400 ; the throttle pin 400 is disposed at the outlet of the oil return channel 310 of the fixed scroll 300 . The throttle pin 400 can throttle and reduce the pressure of the oil in the oil return channel 310 .

[0061] like Figure 3, as shown in other embodiments of the present invention, along the circumferential direction of the main frame 200, the first oil channel 121 is located on one side of the oil return groove 110; the two ends of the first oil channel 121 are respectively connected to the oil return groove 110 and the first air intake channel 221, and the two ends of the second oil channel 122 are respectively connected to the first air intake channel 221 and the second air intake channel 222; and d2≥d1. Specifically, the first oil outlet groove 131 and the second oil outlet groove 132 are both arranged on the end surface of the main frame 200 close to the fixed scroll 300, and the connecting oil channel 120 is only arranged along one side of the circumference of the main frame 200, and the refrigerant oil flows from the oil return channel 310 of the fixed scroll 300 and the oil return groove 110 to the first oil outlet groove 131 and the second oil outlet groove 132 in sequence under the suction action of the compressor. Due to the different distribution positions of the flow channels, the refrigerant oil will be firstly sucked away by the first oil outlet groove 131 . At this time, the width of the oil outlet groove is d2 ≥ d1 , thereby ensuring the refrigerant oil suction amount of the second oil outlet groove 132 .

[0062] In a second aspect, the present invention provides an electric scroll compressor, which includes the oil return assembly 10 of any one of the aforementioned embodiments. The electric scroll compressor also includes a main bearing, a movable scroll, an oil-gas separation structure and a top cover 21. The main bearing is arranged in a bearing chamber 210. The movable scroll is located between the main frame 200 and the fixed scroll 300, and the top cover 21 is arranged at the top of the fixed scroll 300 away from the main frame 200. The movable scroll and the fixed scroll 300 enclose a compression chamber, and the part of the movable scroll and the fixed scroll 300 that moves in a circle with each other is a vortex part. The oil-gas separation structure is arranged in the top cover 21. The side of the main frame 200 away from the fixed scroll 300 is a low-pressure chamber, and the low-pressure chamber is located in the motor housing of the scroll compressor.

[0063] Furthermore, an exhaust port is provided on the static scroll 300, and an oil-gas separation structure is provided on the top cover 21, and the oil-gas separation structure is mainly composed of an oil separation pipe 22 and an oil return filter 23. When the high-temperature and high-pressure oil-gas mixed fluid discharged from the exhaust port of the static scroll 300 is output to the oil separation structure, oil-gas separation begins. At this time, the high-temperature and high-pressure refrigerant gas is discharged through the exhaust port of the compressor top cover 21, and the refrigeration oil refluxes through the oil return channel 100 due to gravity and pressure difference, and lubricates the friction pair of the scroll compressor, thereby realizing the recycling of the refrigeration oil.

[0064] When the oil return assembly 10 is working, the refrigerant oil separated from the oil and gas is filtered through the oil return filter 23, flows into the oil return channel 100 of the fixed scroll 300, and flows out through the throttling pin 400 built into the fixed scroll 300 for throttling and pressure reduction.

[0065] The low-pressure refrigeration oil reaches the oil return groove 110 of the main frame 200 through the matching hole 511 on the first wear-resistant plate 510 .

[0066] Under the action of the negative pressure of suction in the suction duct (the first suction duct 221 and the second suction duct 222, the same below), part of the refrigeration oil flows into the bearing chamber 210 of the main frame 200 through the oil outlet grooves (the first oil outlet groove 131 and the second oil outlet groove 132, respectively) to lubricate the main bearing, and part of the refrigeration oil flows back to the scroll part through the suction duct, thereby improving the lubrication of the entire compressor and improving the reliability of the compressor.

[0067] Another part is directly sucked into the compression chamber of the scroll for compression, which improves the lubrication of the upper part of the scroll.

[0068] Embodiment 2

[0069] See also Figure 4 and Figure 5 As can be seen from the figure, the scheme of this embodiment is generally the same as the embodiment. The difference between the two is that this scheme also includes a second friction plate, and the return oil groove 110 and the connecting oil channel 120 are arranged on the second friction plate.

[0070] In an optional embodiment, the oil return assembly 10 further includes a second wear-resistant sheet 520; the second wear-resistant sheet 520 is hermetically disposed between the first wear-resistant sheet 510 and the main frame 200; the oil return groove 110 and the connecting oil passage 120 are both penetrated and opened on the second wear-resistant sheet 520. That is, at this time, the first wear-resistant sheet 510, the second wear-resistant sheet 520 and the main frame 200 enclose the oil return groove 110, the connecting oil passage 120, the first oil outlet groove 131 and the second oil outlet groove 132 are channels with closed peripheral walls.

[0071] During assembly, the upper surface of the first wear-resistant plate 510 is in close contact with the end surface of the static scroll 300. The second wear-resistant plate 520 is provided with an oil return groove 110 and a connecting oil passage 120, and during assembly, the upper surface of the second wear-resistant plate 520 is in close contact with the lower surface of the first wear-resistant plate 510, and the lower surface of the second wear-resistant plate 520 is in close contact with the end surface of the main frame 200. Specifically, the refrigerant oil of the static scroll 300 that is throttled and depressurized by the throttling pin 400 flows through the matching hole 511 on the first wear-resistant plate 510 and into the oil return groove 110 on the second wear-resistant plate 520. Figure 5 As shown, under the action of the negative pressure of the suction, the refrigerant oil flows from the oil return channel 100 of the second wear-resistant plate 520 into the oil outlet grooves (the first oil outlet groove 131 and the second oil outlet groove 132, the same below) provided on the main frame 200. One end of the oil outlet groove is connected to the suction duct (the first suction duct 221 and the second suction duct 222, the same below), and a part of the refrigerant oil flows back to the low-pressure chamber, and a part of the refrigerant oil directly enters the vortex part under the action of the negative pressure of the suction duct to lubricate the upper part of the vortex. The other end of the oil outlet groove is connected to the bearing chamber 210 of the main frame 200 to lubricate the main bearing, which can enhance the lubrication effect at the friction pair, avoid friction loss, and improve the performance of the scroll compressor.

[0072] Further, in this embodiment, the first oil outlet groove 131 and the second oil outlet groove 132 are both arranged on the end surface of the main frame 200 close to the fixed scroll 300. Optionally, the first oil passage 121 is located on one side of the oil return groove 110; the two ends of the first oil passage 121 are respectively connected to the oil return groove 110 and the first air intake passage 221, and the two ends of the second oil passage 122 are respectively connected to the first air intake passage 221 and the second air intake passage 222. In this way, the structure of the second friction plate is simplified, and the structural stability of the oil return assembly 10 is improved.

[0073] The oil return assembly 10 and the electric scroll compressor of the embodiment of the present invention have at least the following advantages:

[0074] 1. The main frame 200 is provided with an oil return channel 100, which has a simple structure and reliable oil return. In addition, the refrigeration oil improves the oil return effect of the entire compressor during the entire circulation process. The compressor has sufficient oil return, the friction pairs are well lubricated, friction loss is avoided, and the performance and reliability of the entire compressor are also improved.

[0075] 2. The oil outlet groove of the main frame 200 is at the upper part, which is beneficial to improving the lubrication of the main bearing and the upper part of the scroll, enhancing the sealing of the scroll part, and improving the reliability of the scroll component.

[0076] 3. The oil return tank 110 of the main frame 200 is at the bottom, and the oil return effect is good.

[0077] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An oil return assembly, characterized in that: include: Oil return channel (100), main frame (200), static scroll (300); A bearing chamber (210) is provided at the center of the main frame (200); a first air intake passage (221) and a second air intake passage (222) are also provided on the main frame (200), and both the first air intake passage (221) and the second air intake passage (222) penetrate the main frame (200) along the axial direction of the main frame (200); the first air intake passage (221) is communicated with the air intake cavity of the fixed scroll (300), and the second air intake passage (222) is communicated with the air intake cavity of the movable scroll; the fixed scroll (300) is hermetically arranged on the top of the main frame (200); The oil return channel (100) comprises an oil return groove (110), a connecting oil channel (120), a first oil outlet groove (131) and a second oil outlet groove (132); the oil return groove (110) is connected to the outlet of the oil return channel (310) of the fixed scroll (300); One end of the first oil outlet groove (131) is in communication with the first air intake duct (221), and the other end is in communication with the bearing chamber (210); one end of the second oil outlet groove (132) is in communication with the second air intake duct (222), and the other end is in communication with the bearing chamber (210); one end of the connecting oil passage (120) is in communication with the oil return groove (110), and the other end is in communication with the first oil outlet groove (131) and the second oil outlet groove (132), respectively.

2. The oil return assembly according to claim 1, characterized in that: The connecting oil passage (120) comprises a first oil passage (121) and a second oil passage (122); Along the circumferential direction of the main frame (200), the first oil passage (121) and the second oil passage (122) are respectively located on both sides of the oil return groove (110); two ends of the first oil passage (121) are respectively connected to the oil return groove (110) and the first air intake passage (221), and two ends of the second oil passage (122) are respectively connected to the oil return groove (110) and the second air intake passage (222); Along the circumferential direction of the main frame (200), the width of the first oil passage (121) is d1, and the width of the second oil passage (122) is d2; d2=d1.

3. The oil return assembly according to claim 1, characterized in that: The connecting oil passage (120) comprises a first oil passage (121) and a second oil passage (122); Along the circumferential direction of the main frame (200), the first oil passage (121) is located on one side of the oil return groove (110); two ends of the first oil passage (121) are respectively connected to the oil return groove (110) and the first air intake passage (221); and two ends of the second oil passage (122) are respectively connected to the first air intake passage (221) and the second air intake passage (222); Along the circumferential direction of the main frame (200), the width of the first oil passage (121) is d1, and the width of the second oil passage (122) is d2; d2≥d1.

4. The oil return assembly according to claim 2 or 3, characterized in that: The first oil passage (121) and the second oil passage (122) both extend in an arc shape along the center of the main frame (200); Along the radial direction of the main frame (200), the first oil passage (121), the second oil passage (122) are at the same distance from the center of the main frame (200).

5. The oil return assembly according to claim 1, characterized in that: The first oil outlet groove (131) and the second oil outlet groove (132) are both arranged on an end surface of the main frame (200) close to the fixed scroll (300).

6. The oil return assembly according to claim 5, characterized in that: The oil return groove (110), the connecting oil passage (120), the first oil outlet groove (131) and the second oil outlet groove (132) are all arranged on an end surface of the main frame (200) close to the fixed scroll (300).

7. The oil return assembly according to claim 5, characterized in that: Also includes a first wear-resistant sheet (510); The first wear-resistant plate (510) is hermetically arranged between the main frame (200) and the static scroll (300); the first wear-resistant plate (510) has a matching channel (511), the top surface of the matching channel (511) is connected to the outlet of the oil return channel (310) of the static scroll (300), and the bottom surface of the matching channel (511) is connected to the oil return groove (110).

8. The oil return assembly according to claim 7, characterized in that: Also includes a second wear-resistant sheet (520); The second wear-resistant sheet (520) is hermetically arranged between the first wear-resistant sheet (510) and the main frame (200); the oil return groove (110) and the connecting oil passage (120) are both opened through the second wear-resistant sheet (520).

9. The oil return assembly according to claim 1, characterized in that: Also included is a throttle pin (400); The throttle pin (400) is arranged at the outlet of the oil return channel (310) of the fixed scroll (300).

10. An electric scroll compressor, characterized in that: The electric scroll compressor comprises the oil return assembly according to any one of claims 1-9.

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