Scroll compressor with oil return mechanism

Abstract

The application discloses a scroll compressor with an oil return mechanism and belongs to the scroll compressor field, which comprises a compressor body, a static disc and a dynamic disc, the end of the compressor body is fixedly connected with the static disc, the compressor body is rotationally provided with the dynamic disc through a bearing and a crankshaft at one end close to the static disc, the side, away from the compressor body, of the static disc is provided with a high-pressure cavity, the high-pressure cavity is internally provided with an oil separator, and the compressor body is provided with a low-pressure cavity at the side of the dynamic disc. The first oil return channel and the throttle valve are arranged at the bottom of the high-pressure cavity, the second oil return channel is matched with the third oil return channel and the sealing channel, two oil paths are formed, the dead-zone lubricating oil can be introduced into the sealing groove by the pressure of the high-pressure cavity, the pressure at the bottom of the sealing strip is provided to lift the sealing strip, the sealing rubber strip is compressed, the sealing strip is tightly attached to the dynamic disc, the sealing property is improved, the leakage is reduced, and the compressor performance is improved.

Description

Technical Field

[0001] This invention relates to the field of scroll compressor technology, and in particular to a scroll compressor with an oil return mechanism. Background Technology

[0002] A scroll compressor is a positive displacement fluid machine that relies on the continuous change in the volume of a crescent-shaped closed cavity formed by the meshing of a moving scroll and a stationary scroll to achieve gas intake, compression, and exhaust. The compressor lubricating oil is dissolved in the refrigerant and circulates with the refrigerant in the air conditioning system.

[0003] For compressors, within a certain range, the more compressor oil, the better the lubrication performance; however, for air conditioners, the presence of compressor oil can actually reduce cooling capacity. Therefore, most scroll compressors currently have an oil separation mechanism built into the exhaust cover side. After the compressed gas is discharged from the exhaust hole of the stationary plate, it enters the high-pressure chamber of the exhaust cover and enters from the inlet of the oil separator. It rotates tangentially around the gap between the inner and outer walls. The oil and gas are mainly separated during the rotational flow. The separated lubricating oil is deposited at the bottom of the oil-gas separator, flows back through the inclined hole of the stationary plate to the throttling channel on the wear-resistant gasket, and finally flows along the flow channel of the bearing housing to the low-pressure chamber to lubricate the main bearing. The gas is discharged through the outlet in the middle of the inner wall.

[0004] The patent with application number 201911379787.6 connects the sealing groove of the vortex tooth of the static vortex disk directly to the high-pressure chamber and uses refrigerant to lift the rubber gasket to prevent sealing leakage caused by gasket wear. However, the direct use of refrigerant may also lead to high-pressure refrigerant leaking directly into the low-pressure area, affecting compression performance.

[0005] Meanwhile, during actual testing, it was found that when compressed gas passes through the inlet of the oil separator and undergoes the first oil-gas separation, a large portion of the lubricating oil accumulates in the high-pressure chamber, forming a dead zone. This portion not only prevents the lubricating oil from being recycled, greatly reducing its effectiveness, but also affects the opening of the exhaust valve, increasing power consumption, indicating room for improvement. Summary of the Invention

[0006] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a scroll compressor with an oil return mechanism. By designing an oil circulation structure, the lubrication of the dead zone is directed to the operating parts for lubrication and cooling, thereby improving the utilization rate of internal lubricating oil, reducing power consumption, improving the volumetric efficiency and reliability of the compressor, and solving the above-mentioned problems.

[0007] To achieve the above objectives, a scroll compressor with an oil return mechanism is provided, comprising a compressor body, a stationary disc, and a moving disc. The stationary disc is fixedly connected to one end of the compressor body. The moving disc is rotatably mounted on the compressor body near the stationary disc via a bearing and a crankshaft. A high-pressure chamber is provided on the side of the compressor body away from the stationary disc. An oil separator is provided inside the high-pressure chamber. A low-pressure chamber is provided on the side of the compressor body near the moving disc. The stationary disc has scroll teeth and a sealing groove is formed on the tooth surface of the scroll teeth. A scroll-shaped sealing strip is provided in the sealing groove. The stationary disc has a first oil return channel at the bottom of the high-pressure chamber, and a throttle valve is installed inside the first oil return channel. The stationary disc has a second oil return channel connected to the first oil return channel on the side of the first oil return channel. The stationary disc has a third oil return channel below the second oil return channel. A capillary tube is embedded in the end of the third oil return channel away from the second oil return channel. The stationary disc has a sealing channel above the second oil return channel. An oil sump is provided on the side of the moving disc away from the stationary disc. A moving disc flow channel is provided on one edge of the moving disc at the oil sump. A wear-resistant gasket is provided on one side of the moving disc flow channel of the compressor body. A first opening and a second opening are respectively provided on the wear-resistant gasket.

[0008] According to the aforementioned scroll compressor with an oil return mechanism, the throttle valve includes a steel ball, a spring, and a first plug. The first plug is press-fitted against the end of the first oil return passage away from the high-pressure chamber. The spring is disposed between the steel ball and the first plug to form a clamping force to seal the first oil return passage.

[0009] According to the aforementioned scroll compressor with an oil return mechanism, the two ends of the second oil return channel are respectively connected to the third oil return channel and the sealing channel.

[0010] According to the aforementioned scroll compressor with an oil return mechanism, one end of the second oil return channel is provided with an oil hole penetrating the outer surface of the stationary plate, and a second plug is provided at the position of the oil hole in the second oil return channel.

[0011] According to the aforementioned scroll compressor with an oil return mechanism, the compressor body is provided with a bearing housing at the low-pressure chamber position, and the compressor body is provided with a fourth oil return channel below the bearing housing, and the interior of the fourth oil return channel is provided with high and low steps.

[0012] According to the aforementioned scroll compressor with an oil return mechanism, the end of the sealing channel away from the second oil return channel is connected to the sealing groove of the stationary plate.

[0013] According to the aforementioned scroll compressor with an oil return mechanism, the first opening and the second opening correspond to the positions of the two ends of the high and low steps.

[0014] According to the aforementioned scroll compressor with oil return mechanism, the position of the first opening corresponds to the position of the capillary tube, and the position of the second opening corresponds to the position of the oil sump at a specific angle of the moving plate. Since the moving plate moves in a circular motion around the stationary plate, the oil sump should avoid communicating with the bearing hole of the bearing seat during operation. Therefore, the oil sump of the moving plate and the second opening can coincide at a specific operating angle of the moving plate.

[0015] The above solution has at least one of the following beneficial effects: 1. This invention forms two oil circuits by setting a first oil return channel and a throttle valve at the bottom of the high-pressure chamber, in conjunction with a second oil return channel, a third oil return channel, and a sealing channel. The pressure of the high-pressure chamber can be used to introduce lubricating oil from the dead zone into the sealing groove, providing a pressure at the bottom of the sealing strip to lift the sealing strip, tightening the sealing strip and making it adhere tightly to the moving plate, improving sealing performance and reducing leakage. Furthermore, the lubricating oil has a larger molecular weight, resulting in less leakage. Even a small amount of leaked lubricating oil can lubricate the sealing strip, reducing wear on the sealing strip and improving compressor performance. At the same time, the other circuit can be led to the operating parts for lubrication and cooling through the third oil return channel, improving the utilization rate of internal lubricating oil, reducing power consumption, and enhancing the practicality of the device.

[0016] 2. A capillary tube is embedded in the third oil return channel of the present invention to prevent direct connection between the high and low pressure chambers and avoid internal leakage. Oil flows through the capillary tube and the first opening on the wear-resistant gasket to form a channel to the fourth oil return channel on the bearing seat. The fourth oil return channel is provided with high and low steps. When the oil pool on the back of the moving plate is connected to the second opening, the pressure in the oil pool increases and flows through the flow channel on the back of the moving plate. A portion of the oil flows to the anti-rotation hole, forming an oil film between the anti-rotation hole and the hole, reducing wear. A portion of the oil forms an oil film between the back of the moving plate and the wear-resistant plate, which can reduce wear, improve the service life of parts, reduce power consumption, and enhance the practicality of the device.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a cross-sectional view of the static disk of the present invention; Figure 2 This is a schematic diagram of the opening of the wear-resistant gasket of the present invention; Figure 3 This invention relates to a scroll compressor with an oil return mechanism. Figure 1 A sectional view along direction A; Figure 4 This invention relates to a scroll compressor with an oil return mechanism. Figure 2 A sectional view along direction B.

[0019] Figure 5 This is a schematic diagram of the oil sump structure of the moving disc of the present invention.

[0020] Legend: 1. Compressor body; 2. Stationary plate; 3. Moving plate; 4. Low-pressure chamber; 5. High-pressure chamber; 6. Oil separator; 7. First oil return channel; 8. Second oil return channel; 9. Third oil return channel; 10. Fourth oil return channel; 11. Throttling valve; 12. Second plug; 13. Oil sump; 14. Moving plate flow channel; 15. Wear-resistant gasket; 16. First opening; 17. Second opening; 18. High and low steps; 19. Capillary tube; 20. Sealing channel. Detailed Implementation

[0021] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention. The drawings are all in a very simplified form and use non-precise proportions. They are only used to facilitate and clarify the purpose of illustrating the embodiments of the present invention, and should not be construed as limiting the scope of protection of the present invention.

[0022] Reference Figure 1-5 This invention provides a scroll compressor with an oil return mechanism, including a compressor body 1, a stationary plate 2 and a moving plate 3. The stationary plate 2 is fixedly connected to the end of the compressor body 1. The moving plate 3 is rotatably mounted on the compressor body 1 near the stationary plate 2 via a bearing and a crankshaft. A high-pressure chamber 5 is provided on the side of the compressor body 1 away from the stationary plate 2. An oil separator 6 is provided inside the high-pressure chamber 5. A bearing seat is provided on the compressor body 1 at the position of the low-pressure chamber 4.

[0023] The stationary disc 2 has a first oil return channel 7 at the bottom of the high-pressure chamber 5. A throttle valve 11 is installed inside the first oil return channel 7. The throttle valve 11 includes a steel ball, a spring, and a first plug. The first plug is press-fitted against the end of the first oil return channel 7 away from the high-pressure chamber 5. The spring is positioned between the steel ball and the first plug, forming a clamping force to seal the first oil return channel 7. The stationary disc 2 has a second oil return channel 8 on the side of the first oil return channel 7, communicating with it. One end of the second oil return channel 8 penetrates the outer surface of the stationary disc 2 and has an oil hole. A second plug 12 is installed at the oil hole location in the second oil return channel 8. Below the second oil return channel 8, the stationary disc 2 has... The third oil return channel 9 has a capillary tube 19 embedded in its end away from the second oil return channel 8. A sealing channel 20 is formed above the second oil return channel 8 on the stationary plate 2. Both ends of the second oil return channel 8 are connected to the third oil return channel 9 and the sealing channel 20, respectively. The end of the sealing channel 20 away from the second oil return channel 8 is connected to the sealing groove of the stationary plate 2. During oil separation and deposition, the lubricating oil at the bottom of the high-pressure chamber 5 gradually accumulates. When the oil level reaches the inlet height of the first oil return channel 7, under the action of the gas pressure inside the high-pressure chamber 5, the lubricating oil overcomes the clamping force of the spring on the steel ball in the throttle valve 11, pushing the steel ball open and entering the first oil return channel 7. The lubricating oil entering the first oil return channel 7 is then diverted to the second oil return channel 8, which is connected to it. Part of the lubricating oil flows upward through the second return oil channel 8 into the sealing channel 20 that passes through the vortex teeth. Since the end of the sealing channel 20 away from the second return oil channel 8 is connected to the sealing groove of the stationary plate 2, this part of the lubricating oil enters the sealing groove and forms a certain pressure at the bottom of the sealing strip, pushing the sealing strip upward and making it fit more tightly against the end face of the moving plate 3, thereby effectively enhancing the sealing between the stationary plate 2 and the moving plate 3, reducing gas leakage during the compression process, and improving the volumetric efficiency of the compressor. The other part of the lubricating oil flows downward through the second return oil channel 8 into the third return oil channel 9. The capillary tube 19 embedded at the end of the third return oil channel 9 plays a role in limiting the flow and reducing the pressure of the lubricating oil, preventing the high-pressure gas in the high-pressure chamber 5 from directly entering the low-pressure area through the return oil channel without compression, causing internal leakage. The lubricating oil after being throttled by the capillary tube 19 flows out from the third return oil channel 9 and flows to the first opening 16 opened on the wear-resistant gasket 15.

[0024] Meanwhile, an oil sump 13 is provided on the side of the moving disc 3 away from the stationary disc 2. A fourth oil return channel 10 is provided below the bearing housing of the compressor body 1. The interior of the fourth oil return channel 10 has raised and lower steps 18. The first opening 16 and the second opening 17 on the wear-resistant gasket 15 correspond to the two ends of the raised and lower steps 18, respectively. The first opening 16 corresponds to the position of the capillary tube 19, allowing the lubricating oil flowing from the capillary tube 19 to enter the fourth oil return channel 10 through the first opening 16. A moving disc flow channel 14 is provided on one edge of the oil sump 13 of the moving disc 3. The position of the second opening 17 corresponds to the position of the oil sump 13 at a specific angle of the moving disc 3. Because the moving disc 3 rotates circumferentially around the stationary disc 2, the oil sump 13 is not always connected to the second opening 17 during its operation; it only coincides with the second opening 17 when the moving disc 3 rotates to a specific angle. When the lubricating oil enters the fourth return oil channel 10 through the first opening 16, it is guided by the structure of the high and low steps 18, causing the oil sump 13 on the back of the moving plate 3 to connect with the second opening 17. This increases the pressure in the oil sump 13, allowing the lubricating oil to flow through the moving plate flow channel 14. Part of the lubricating oil flows to the anti-rotation hole, forming an oil film between the anti-rotation ring and the hole, reducing wear on the anti-rotation components. Another part of the lubricating oil forms an oil film between the back of the moving plate 3 and the wear-resistant gasket 15, further reducing frictional loss between the moving plate 3 and the wear-resistant gasket 15, thereby extending the service life of related parts and reducing the compressor's operating power consumption.

[0025] Working Principle: During operation, the moving scroll disk 3, driven by the crankshaft, performs a circular translation around the stationary disk 2. The volume of the crescent-shaped closed cavity formed by the interaction with the stationary disk 2 continuously changes, thereby completing the intake, compression, and exhaust processes. During compression, the high-pressure oil-gas mixture is discharged from the exhaust port of the stationary disk 2 and enters the high-pressure chamber 5, subsequently entering the oil separator 6. The oil-gas mixture rotates tangentially within the oil separator 6. Under centrifugal force, most of the lubricating oil is separated and deposited at the bottom of the high-pressure chamber 5, forming a so-called "dead zone." When the bottom of the high-pressure chamber 5... When the lubricating oil accumulates to a certain level and reaches the inlet height of the first return oil channel 7, under the action of the gas pressure in the high-pressure chamber 5, the lubricating oil overcomes the clamping force of the spring on the steel ball in the throttle valve 11, pushes open the steel ball, and enters the first return oil channel 7; the lubricating oil entering the first return oil channel 7 is then diverted to the second return oil channel 8; a portion of the lubricating oil flows upward into the sealing channel 20 through the second return oil channel 8, and finally enters the sealing groove of the stationary plate 2, forming pressure at the bottom of the sealing strip, lifting the sealing strip and tightly adhering it to the end face of the moving plate 3, effectively enhancing the sealing performance and reducing leakage; Another portion of the lubricating oil flows downwards through the second return oil channel 8 into the third return oil channel 9. After being limited and depressurized by the capillary tube 19, it enters the fourth return oil channel 10 below the bearing housing through the first opening 16 on the wear-resistant gasket 15. Since the fourth return oil channel 10 has high and low steps 18, when the moving plate 3 rotates to a specific angle, the oil sump 13 on its back coincides with the second opening 17 on the wear-resistant gasket 15. Under pressure, the lubricating oil in the fourth return oil channel 10 enters the oil sump 13 through the second opening 17. The pressure in the oil sump 13 increases, and the lubricating oil flows through the moving plate flow channel 14. Part of it flows to the anti-rotation hole to form an oil film to reduce anti-rotation wear. The other part forms an oil film between the back of the moving plate 3 and the wear-resistant gasket 15 to reduce friction between the two. Through such an oil return mechanism, the lubricating oil that originally accumulated in the "dead zone" of the high-pressure chamber is effectively guided to the sealing groove and various moving parts, realizing the recycling of lubricating oil, improving lubrication efficiency, reducing power consumption, and improving the volumetric efficiency and operational reliability of the compressor.

[0026] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A scroll compressor with an oil return mechanism, comprising a compressor body (1), a stationary disc (2), and a moving disc (3), wherein the stationary disc (2) is fixedly connected to the end of the compressor body (1), and the moving disc (3) is rotatably mounted on the compressor body (1) near the stationary disc (2) via a bearing and a crankshaft; a high-pressure chamber (5) is provided on the side of the compressor body (1) away from the stationary disc (2), and an oil separator (6) is provided inside the high-pressure chamber (5); a low-pressure chamber (4) is provided on the side of the compressor body (1) near the moving disc (3); the stationary disc (2) has scroll teeth and a sealing groove is formed on the tooth surface of the scroll teeth, and a scroll-shaped sealing strip is provided in the sealing groove, characterized in that: The stationary disc (2) has a first oil return channel (7) at the bottom of the high pressure chamber (5), and a throttle valve (11) is provided inside the first oil return channel (7). The stationary disc (2) has a second oil return channel (8) connected to the first oil return channel (7) on the side of the first oil return channel (7). The stationary disc (2) has a third oil return channel (9) below the second oil return channel (8). A capillary tube (19) is embedded in the end of the third oil return channel (9) away from the second oil return channel (8). The stationary disc (2) has a sealing channel (20) above the second oil return channel (8). An oil sump (13) is provided on the side of the moving plate (3) away from the stationary plate (2). A moving plate flow channel (14) is provided on the edge of the oil sump (13) of the moving plate (3). A wear-resistant gasket (15) is provided on the side of the moving plate flow channel (14) of the moving plate (3). A first opening (16) and a second opening (17) are respectively provided on the wear-resistant gasket (15).

2. A scroll compressor with an oil return mechanism according to claim 1, characterized in that, The throttle valve (11) includes a steel ball, a spring and a first plug. The first plug is press-fitted against the end of the first return oil passage (7) away from the high pressure chamber (5). The spring is disposed between the steel ball and the first plug to form a pressing force to seal the first return oil passage (7).

3. A scroll compressor with an oil return mechanism according to claim 1, characterized in that, The two ends of the second oil return channel (8) are connected to the third oil return channel (9) and the sealing channel (20) respectively.

4. A scroll compressor with an oil return mechanism according to claim 1, characterized in that, One end of the second oil return channel (8) is provided with an oil hole through the outer surface of the stationary plate (2), and a second plug (12) is provided at the oil hole position of the second oil return channel (8).

5. A scroll compressor with an oil return mechanism according to claim 1, characterized in that, The compressor body (1) has a bearing seat at the low-pressure chamber (4) position, and the compressor body (1) has a fourth oil return channel (10) below the bearing seat. The interior of the fourth oil return channel (10) has high and low steps (18).

6. A scroll compressor with an oil return mechanism according to claim 1, characterized in that, The end of the sealing channel (20) away from the second return oil channel (8) passes through the vortex teeth and connects to the sealing groove of the stationary plate (2).

7. A scroll compressor with an oil return mechanism according to claim 5, characterized in that, The first opening (16) and the second opening (17) correspond to the positions of the two ends of the high and low steps (18).

8. A scroll compressor with an oil return mechanism according to claim 7, characterized in that, The position of the first opening (16) corresponds to the position of the capillary (19), and the position of the second opening (17) corresponds to the position of the oil tank (13).

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