Scroll compressor

By setting the oil conveying channel and flow limiting part on the thrust surface, the problem of poor lubrication effect of the scroll compressor at extremely low temperatures is solved, better lubrication and friction reduction are achieved, and the stability and life of the compressor are improved.

CN223257055UActive Publication Date: 2025-08-22SUZHOU INVOTECH SCROLL TECH
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Patent Information

Application Number
CN202421847591.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-08-01
Publication Date
2025-08-22
Estimated Expiration
2034-08-01

AI Technical Summary

Technical Problem

When existing scroll compressors operate at extremely low evaporation temperatures, the lubrication effect between the moving scroll disc and the main bearing seat is poor, resulting in high friction, affecting the stability and life of the compressor.

Method used

The oil transfer channel is set on the thrust surface, including the oil transfer tank, the oil discharge end and the flow limiting part. The oil storage end and the oil supply channel are designed to ensure that the lubricant oil maintain sufficient oil pressure and liquid level in the oil transfer tank, and the flow rate of the lubricant is controlled through the flow limiting part to improve the lubricating effect.

Benefits of technology

It enhances the lubrication effect between the thrust surface and the contact surface, reduces friction, and improves the stability and service life of the compressor.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a scroll compressor, which comprises a compression part, a compression part and a compression part, the compression part comprises a movable scroll plate and a static scroll plate, and the movable scroll plate is provided with a contact surface; a thrust plate is arranged in the main bearing seat, and the thrust plate is provided with a thrust surface abutting against the contact surface; an oil conveying channel is formed in the thrust surface, and is provided with an oil conveying groove and an oil discharging end communicated with the oil conveying groove; in the working state, lubricating oil sequentially passes through the oil conveying groove and the oil discharging end and flows out of the thrust surface. The oil discharging end is provided with a flow limiting part used for intercepting lubricating oil in the oil conveying channel. According to the utility model, the oil conveying channel is arranged on the thrust surface, the oil storage end and the oil discharge end are arranged on the oil conveying channel, and the flow limiting part is arranged in the oil discharge end, so that the oil inlet flow of the oil conveying groove and the liquid level height of lubricating oil in the oil conveying groove are improved, the lubricating oil is in better contact with the contact surface, and the lubricating effect between the thrust surface and the contact surface is improved.
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Description

Technical Field

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

[0002] A scroll compressor is a positive displacement compressor whose compression components are mainly composed of an orbiting scroll and a stationary scroll. It utilizes the relative orbital motion of the orbiting and stationary scrolls to form a continuous change in the closed volume, thereby achieving the purpose of compressing the gas.

[0003] Heat pump scroll compressors need to operate at extremely low ambient temperatures, which requires the compressor to operate stably at extremely low evaporation temperatures. However, extremely low evaporation temperatures will result in extremely low gas flow rates, posing a huge challenge to the lubrication of the scroll compressor's moving parts, especially the moving disc that bears the greatest force and the thrust surface of the main bearing seat.

[0004] A conventional compressor discloses a compressor having an oil delivery groove located on the contact surface of the orbiting scroll end plate and / or the thrust surface of the thrust plate, and communicating radially outward and / or radially inward of the area where the thrust surface and the contact surface contact each other. Lubricating oil can flow in the oil delivery groove to lubricate the contact surface of the orbiting scroll end plate and the thrust surface of the thrust plate. In actual use, the orbiting scroll plate performs a swirling motion, and the oil outlet hole is intermittently connected to the oil delivery groove, resulting in a limited amount of lubricating oil flowing into the oil delivery groove. When the oil outlet hole and the oil delivery groove are intermittently disconnected, the lubricating oil will quickly flow out at the terminal end, causing the lubricating oil pressure and liquid level in the oil delivery groove to drop rapidly. As a result, the lubrication effect on the thrust surface is poor.

[0005] Therefore, it is necessary to develop a mechanism to reduce the friction between the orbiting scroll and the main bearing seat. Utility Model Content

[0006] In order to solve the above technical problems, the utility model discloses a scroll compressor, which solves the problem of large friction between the main bearing seat and the movable scroll plate, enables the lubricating oil to better contact the contact surface, and improves the lubrication effect between the thrust surface and the contact surface.

[0007] Specifically, the utility model discloses a scroll compressor thrust plate oil supply mechanism, comprising:

[0008] A compression portion, the compression portion including an orbiting scroll and a fixed scroll cooperating with the orbiting scroll, the orbiting scroll having a contact surface;

[0009] A main bearing seat is provided with a thrust plate in the main bearing seat, the thrust plate is provided below the compression portion, and the thrust plate has a thrust surface abutting against the contact surface; wherein,

[0010] An oil delivery channel is provided on the thrust surface, and the oil delivery channel has an oil delivery groove and an oil discharge end connected to the oil delivery groove; in a working state, the lubricating oil passes through the oil delivery groove and the oil discharge end in sequence and flows out of the thrust surface; the oil discharge end has a flow limiting portion for intercepting the lubricating oil in the oil delivery channel.

[0011] Furthermore, the oil discharge end is communicated with the inner side or the outer side of the thrust surface.

[0012] Furthermore, there are at least two oil delivery tanks.

[0013] Furthermore, the oil delivery groove is a non-closed annular groove; at least two of the oil delivery grooves are spaced apart and arranged substantially concentrically.

[0014] Furthermore, at least two of the oil delivery tanks are connected via a connecting tank.

[0015] Furthermore, the communication grooves are arranged in a radial direction or in a tangential direction of at least one oil delivery groove.

[0016] Furthermore, the flow cross-sectional area at the flow limiting portion is smaller than the flow cross-sectional area of ​​any cross section in the oil delivery tank.

[0017] Furthermore, the current limiting portion is at least one of the following:

[0018] A funnel-shaped structure, wherein the flow area near the outlet of the flow restriction portion of the funnel-shaped structure is smaller than the flow area near the inlet;

[0019] upwardly projecting boss;

[0020] An upward convex slope;

[0021] filter;

[0022] A crossbar connected to the side wall of the oil discharge end.

[0023] Furthermore, the oil delivery channel further has an oil storage end, which is connected to the oil delivery groove; in the working state, the lubricating oil passes through the oil storage end, the oil delivery groove, the oil discharge end in sequence, and flows out of the thrust surface;

[0024] An oil supply channel is provided on the movable scroll, and the position of the oil outlet hole of the oil supply channel matches the position of the oil storage end, so that in the working state, the oil supply channel moves with the movable scroll, and the oil outlet hole of the oil supply channel is always connected to the oil storage end.

[0025] Furthermore, the oil storage end is a circular groove.

[0026] The beneficial effects of the present invention are:

[0027] The utility model discloses a thrust surface and an oil delivery channel on the thrust surface, an oil discharge end is provided at the terminal end of the oil delivery channel, and a flow limiting portion is provided at the end of the oil discharge end, the flow limiting portion reduces the flow rate of the lubricating oil in the oil delivery groove, increases the oil pressure of the lubricating oil in the oil delivery groove, enables the lubricating oil to better contact with the contact surface, and improves the lubrication effect between the thrust surface and the contact surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

[0029] Figure 1 This is a schematic diagram of the scroll compressor thrust plate oil supply mechanism;

[0030] Figure 2 This is a cross-sectional view of the thrust plate oil supply mechanism of the scroll compressor;

[0031] Figure 3 This is a partial enlarged view of the thrust plate oil supply mechanism of the scroll compressor;

[0032] Figure 4 It is a schematic diagram of the thrust plate connecting groove;

[0033] Figure 5 This is a schematic diagram of another embodiment of the thrust plate connecting groove;

[0034] Figure 6 It is a schematic diagram of the thrust plate oil delivery groove having a rectangular longitudinal cross section;

[0035] Figure 7 It is a schematic diagram of the thrust plate oil delivery groove having a V-shaped longitudinal section;

[0036] Figure 8 It is a schematic diagram showing that the longitudinal cross-section of the thrust plate oil delivery groove is semicircular.

[0037] The numbers involved in the accompanying drawings are as follows: compression part 1, fixed scroll 11, movable scroll 12, contact surface 120, oil supply channel 121, oil inlet hole 1211, oil outlet hole 1212, oil delivery hole 1213, main bearing seat 2, thrust plate 3, thrust surface 30, oil delivery channel 31, oil storage end 311, oil discharge end 312, oil delivery groove 313, flow limiting part 314, connecting groove 315. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below with reference to the accompanying drawings.

[0039] like Figure 1-8 As shown, the utility model discloses a scroll compressor thrust plate oil supply mechanism, comprising:

[0040] The compression part 1 includes an orbiting scroll 12 and a fixed scroll 11 cooperating with the orbiting scroll 12. The orbiting scroll 12 has a contact surface 120.

[0041] The main bearing seat 2 is provided with a thrust plate 3 in the main bearing seat 2. The thrust plate 3 is provided below the compression portion 1. The thrust plate 3 has a thrust surface 30 that abuts against the contact surface 120.

[0042] An oil delivery channel 31 is provided on the thrust surface 30. The oil delivery channel 31 has an oil delivery groove 313 and an oil discharge end 312 connected to the oil delivery groove 313. In the working state, the lubricating oil flows out of the thrust surface 30 through the oil delivery groove 313 and the oil discharge end 312 in sequence. The oil discharge end 312 has a flow restriction portion 314 for intercepting the lubricating oil in the oil delivery channel 31.

[0043] In the present invention, an oil delivery channel 31 is provided on the thrust surface 30, an oil discharge end 312 is provided at the terminal end of the oil delivery channel 31, and a flow restriction portion 314 is provided at the end of the oil discharge end 312. The flow restriction portion reduces the flow rate of the lubricating oil in the oil delivery groove and increases the oil pressure of the lubricating oil in the oil delivery groove. Even if the oil delivery groove is temporarily short of lubricating oil, the lubricating oil in the oil delivery groove can maintain the required oil pressure and liquid level for a longer period of time, so that the lubricating oil can better contact the contact surface 120, thereby improving the lubrication effect between the thrust surface 30 and the contact surface 120.

[0044] In some embodiments of the present invention, the oil drain port 312 communicates with the inner or outer side of the thrust surface 30. The thrust surface 30 is an annular surface, with its inner side being the inner ring and its outer side being the outer ring. The oil drain port 312 can selectively communicate with the outer or inner side of the thrust surface 30, allowing the lubricating oil in the oil delivery groove 313 to be discharged from the thrust surface 30 through the oil drain port 312.

[0045] In some embodiments of the present invention, at least two oil delivery grooves 313 are provided. Furthermore, the oil delivery grooves 313 are non-closed annular grooves; the at least two oil delivery grooves 313 are spaced apart and arranged substantially concentrically. The number of oil delivery grooves 313 determines the contact area between the lubricating oil and the contact surface 120 and the cooling effect of the thrust plate 3. For thrust plates 3 of the same size, a greater number of oil delivery grooves 313 results in a greater contact area between the lubricating oil and the contact surface 120, resulting in better lubrication and heat dissipation. A smaller number of oil delivery grooves 313 results in a smaller contact area between the lubricating oil and the contact surface 120, resulting in poorer lubrication and heat dissipation. In this embodiment, there are two oil delivery grooves 313.

[0046] In some embodiments of the present invention, the oil delivery grooves 313 are connected via a connecting groove 315 .

[0047] In some embodiments of the present invention, the connecting grooves 315 are arranged in a radial direction or the connecting grooves 315 are arranged in a tangential direction of at least one oil delivery groove 313.

[0048] The provision of the connecting groove 315 increases the contact area 120 between the lubricating oil and the contact surface 120, and also improves the fluidity of the lubricating oil between the oil delivery grooves 313, so that the lubricating oil in the oil delivery grooves 313 is fully exchanged, reducing the temperature difference of the lubricating oil in the two connecting grooves 315, and improving the service life of the thrust plate 3.

[0049] In some embodiments of the present invention, the flow cross-sectional area at the flow restriction portion 314 is smaller than the flow cross-sectional area of ​​any cross section in the oil delivery groove 313, so as to reduce the oil flow at the flow restriction portion 314, so that the oil delivery groove 313 is always filled with lubricating oil, further improving the lubrication effect of the thrust surface 20 and the contact surface 120.

[0050] In some embodiments of the present invention, the flow limiting portion 314 is at least one of the following:

[0051] A funnel-shaped structure, wherein the flow area near the outlet of the flow restriction portion 314 of the funnel-shaped structure is smaller than the flow area near the inlet;

[0052] upwardly projecting boss;

[0053] An upward convex slope;

[0054] filter;

[0055] A crossbar connected to the side wall of the oil discharge end 312.

[0056] The function of the flow limiting portion 314 is mainly to reduce the area of ​​the oil outlet and reduce the discharge flow rate of the lubricating oil. Therefore, the flow limiting portion 314 is not limited to the above-mentioned preferred structure.

[0057] In some embodiments of the present invention, the oil delivery channel further includes an oil reservoir 311, which communicates with an oil delivery groove 313. During operation, lubricating oil sequentially passes through the oil reservoir 311, the oil delivery groove 313, and the oil discharge end 312 before flowing out of the thrust surface 30. Furthermore, the orbiting scroll 12 is provided with an oil supply channel 121, which is positioned to match the position of the oil reservoir 311 and supplies lubricating oil to the oil reservoir 311. The oil supply channel 121 communicates with the oil reservoir 311, allowing lubricating oil to enter the oil reservoir 311, then pass through the oil delivery groove 313 and the oil discharge end 312, and exit the thrust surface 30, forming a circulation system that removes heat generated by friction between the contact surface 120 and the thrust surface 30.

[0058] On the other hand, the lubricating oil can also be supplied to the contact surface 120 or the thrust surface 30 in other ways, such as by rotating a balancing block provided on the drive shaft to throw the lubricating oil between the contact surface 120 and the thrust surface.

[0059] In some embodiments of the present invention, the oil supply channel 121 has an oil outlet 1212. The position of the oil outlet 1212 matches the position of the oil storage end 311, so that in the operating state, the oil supply channel 121 moves with the orbiting scroll 12, so that the oil outlet 1212 of the oil supply channel 121 is always connected to the oil storage end 311. The oil supply channel 121 also has an oil inlet 1211 and an oil delivery hole 1213. The oil inlet 1211 and the oil outlet 1212 are connected through the oil delivery hole 1213. The oil inlet 1211 is located at the bottom of the orbiting scroll 12 and is connected to the oil channel of the drive shaft. The lubricating oil in the oil pool at the bottom of the compressor passes through the oil channel and the oil inlet 1211, enters the oil delivery hole 1213, and flows out through the oil outlet 1212 and enters the oil storage end 311.

[0060] In some embodiments of the present invention, the oil storage end 311 is a circular groove, and the oil outlet hole 1212 rotates along the outer circumference of the circular groove, thereby improving the matching degree between the two.

[0061] In addition, the longitudinal cross-section of the oil delivery groove 313 can be set in various shapes, preferably rectangular, semicircular, or V-shaped.

[0062] The working mode of the utility model is as follows:

[0063] When the compressor is working, the lubricating oil in the bottom oil pool is caused to pass through the oil channel of the main shaft and the oil inlet hole 1211 of the movable scroll 12, enter the oil delivery hole 1213, and be discharged at the oil outlet hole 1212 under the action of the oil pump; during the translational motion of the movable scroll 12, the oil outlet hole 1212 is always connected with the oil storage end 311. Under the action of the oil pump, a large amount of lubricating oil enters the oil storage end 311, and the pressure of the oil storage end 311 is greater than the pressure of the oil discharge end 312, so that the lubricating oil in the oil storage end 311 flows along the oil delivery groove 313, and the lubricating oil liquid contacts the contact surface 120 to achieve a lubrication effect; the flow restriction portion reduces the flow rate of the lubricating oil in the oil delivery groove and increases the oil pressure of the lubricating oil in the oil delivery groove; on the other hand, after the lubricating oil liquid is discharged from the oil delivery channel 31 through the flow restriction portion 314, it takes away the heat generated by the friction between the contact surface 120 and the thrust surface 30, thereby improving the service life of the compressor.

[0064] For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A scroll compressor, characterized in that: include: A compression part (1), the compression part (1) comprising an orbiting scroll (12) and a fixed scroll (11) cooperating with the orbiting scroll (12), the orbiting scroll (12) having a contact surface (120); A main bearing seat (2), wherein a thrust plate (3) is provided in the main bearing seat (2), wherein the thrust plate (3) is provided below the compression portion (1), and wherein the thrust plate (3) has a thrust surface (30) abutting against the contact surface (120); wherein, An oil delivery channel (31) is provided on the thrust surface (30), and the oil delivery channel (31) has an oil delivery groove (313) and an oil discharge end (312) connected to the oil delivery groove (313); in a working state, lubricating oil flows out of the thrust surface (30) by sequentially passing through the oil delivery groove (313) and the oil discharge end (312); the oil discharge end (312) has a flow restriction portion (314) for intercepting the lubricating oil in the oil delivery channel (31).

2. The scroll compressor according to claim 1, wherein: The oil discharge end (312) is in communication with the inner side or the outer side of the thrust surface (30).

3. The scroll compressor according to claim 2, wherein: At least two oil delivery tanks (313) are provided.

4. The scroll compressor according to claim 3, wherein: The oil delivery groove (313) is a non-closed annular groove; at least two of the oil delivery grooves (313) are spaced apart and substantially concentrically arranged.

5. The scroll compressor according to claim 3, wherein: At least two of the oil delivery grooves (313) are connected via a connecting groove (315).

6. The scroll compressor according to claim 5, characterized in that The communication grooves (315) are arranged in a radial direction or in a tangential direction of at least one oil delivery groove (313).

7. The scroll compressor according to claim 1, wherein: The flow cross-sectional area at the flow limiting portion (314) is smaller than the flow cross-sectional area of ​​any cross section in the oil delivery groove (313).

8. The scroll compressor according to claim 1, wherein: The flow limiting portion (314) is at least one of the following: A funnel-shaped structure, wherein the flow restriction portion (314) of the funnel-shaped structure has a flow area near the outlet smaller than a flow area near the inlet; upwardly projecting boss; An upward convex slope; filter; A crossbar connected to the side wall of the oil discharge end (312).

9. The scroll compressor according to claim 1, wherein: The oil delivery channel also has an oil storage end (311), which is in communication with the oil delivery groove (313); in a working state, the lubricating oil sequentially passes through the oil storage end (311), the oil delivery groove (313), and the oil discharge end (312), and flows out of the thrust surface (30); An oil supply channel (121) is provided on the movable scroll (12), and the position of the oil outlet hole (1212) of the oil supply channel (121) matches the position of the oil storage end (311), so that in a working state, the oil supply channel (121) moves with the movable scroll (12), and the oil outlet hole (1212) of the oil supply channel (121) is always connected to the oil storage end (311).

10. The scroll compressor according to claim 9, wherein: The oil storage end (311) is a circular groove.