Oil return structure of scroll compressor

Abstract

The utility model relates to the technical field of scroll compressors, in particular to an oil return structure of a scroll compressor. The oil return structure of the scroll compressor comprises a silencing plate and a compressor top cover, and the two sides of the silencing plate are provided with end parts which are connected with the bottom of the compressor top cover to form an annular oil pool; an oil return through hole is formed in the bottom of the silencing plate, one end of the oil return through hole is connected with the lower portion of the oil pool, and the other end of the oil return through hole is connected with the low-pressure side of the scroll compressor. The oil return structure comprises an oil control assembly, and the oil control assembly is located above the silencing plate and the liquid level of the oil pool. Vibration noise generated by the scroll compressor is reduced through the silencing plate, meanwhile, the silencing plate and the compressor top cover are connected to form an annular oil pool, and a lubricating oil mist and refrigerant mixture with the refrigerant proportion reduced through the oil control assembly is collected; the oil control assembly is adopted to reduce the proportion of lubricating oil mist and a refrigerant mixture of the refrigerant, and the lubricating effect of return oil is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of scroll compressors, in particular to an oil return structure of a scroll compressor. Background Art

[0002] The prior art CN117489597A compressor oil return structure and scroll compressor provides a compressor oil return structure and a scroll compressor, wherein the compressor oil return structure comprises a stationary scroll, a movable scroll, a crankshaft, a main bracket and a main bearing; the stationary scroll is provided with a first channel along the axial direction of the compressor, one end of the first channel is connected to the high-pressure chamber of the compressor; the main bracket is provided with a main bearing seat accommodating the main bearing and a second channel along the axial direction of the compressor; the main bearing is provided with a third channel connected to the second channel; the crankshaft is provided with a fourth channel and a fifth channel, the two ends of the fourth channel are respectively connected to the third channel and the fifth channel, and the fifth channel runs through the axial direction of the crankshaft. The prior art does not have a silencer, and the amplitude of each component of the scroll compressor is large when it is working, which is easy to make a loud noise; the oil return channel of the prior art requires a large number of oil return holes to be opened on each component, which is difficult to produce and has a long production cycle; the lubricating oil mist is easy to mix with the refrigerant to form a mixture, and the higher the proportion of the refrigerant in the mixture, the worse the lubrication effect on the compressor after the oil returns; the oil return channel is straight, the oil return efficiency is low, and the scroll compressor is relied on to throw the lubricating oil mist and the refrigerant mixture into the oil return channel. Utility Model Content

[0003] In order to solve the problems that the oil return channel in the prior art needs to have a large number of oil return holes on each component, which is difficult to produce and has a long production cycle; the lubricating oil mist is easily mixed with the refrigerant to form a mixture, and the higher the proportion of the refrigerant in the mixture, the worse the lubrication effect on the compressor after the oil return; the oil return channel is straight, the oil return efficiency is low, and the scroll compressor is relied on to throw the lubricating oil mist and the refrigerant mixture into the oil return channel, the utility model provides a scroll compressor oil return structure, the oil return structure includes a silencer plate and a compressor top cover, the two sides of the silencer plate are provided with ends connected to the bottom of the compressor top cover to form an annular oil pool; the bottom of the silencer plate is provided with an oil return through hole, one end of the oil return through hole is connected to the lower part of the oil pool, and the other end is connected to the low-pressure side of the scroll compressor; the oil return structure includes an oil control component, and the oil control component is located above the silencer plate and the liquid level of the oil pool. A silencer is used to reduce the vibration noise generated by the scroll compressor. At the same time, the silencer is connected to the compressor top cover to form an annular oil pool to collect the lubricating oil mist and refrigerant mixture whose refrigerant ratio is reduced by the oil control component; the lubricating oil mist and refrigerant mixture whose refrigerant ratio is reduced by the oil control component is used to improve the lubrication effect of the return oil.

[0004] Preferably, the bottom of the muffler is provided with an oil return block fixed on the muffler, the oil return through hole is provided in the oil return block, and the length of the oil return block is greater than the thickness of the muffler. The use of an oil return block that can be separated from the muffler is conducive to setting the oil return through hole, changing the oil return position of the return oil, making the lubricating oil of the return oil close to the axis position, and improving the lubricating effect of the lubricating oil.

[0005] Preferably, the diameter of the oil return hole at the bottom of the muffler plate is less than 1.5 mm. The appropriate diameter of the oil return hole is used to control the amount of lubricating oil replenished per unit time, ensure the normal operation of the scroll compressor, and avoid wasting lubricating oil.

[0006] Preferably, the scroll compressor includes a check valve, the muffler plate is annular, the inner ring of the muffler plate is in contact with the outer shell of the check valve, and the outer ring of the muffler plate is connected to the compressor top cover. The muffler plate and the compressor top cover form an oil pool, and the oil pool collects the lubricating oil sprayed from the check valve and processed by the oil control component, which is conducive to oil return lubrication of the scroll compressor and improves the reliability of the scroll compressor.

[0007] Preferably, a seal is provided at the contact surface between the muffler plate and the outer shell of the check valve. The seal is used to improve the sealing between the muffler plate and the outer shell of the check valve to prevent the newly added lubricating oil from mixing with the lubricating oil mist and refrigerant mixture containing refrigerant sprayed from the check valve, mainly to prevent the lubricating oil mist and refrigerant mixture from directly returning to the oil without passing through the oil control component and the lubricating oil from not effectively lubricating the friction pair of the scroll compressor.

[0008] Preferably, the scroll compressor includes a compressor housing, and a ring-shaped connecting end is provided at the connection between the muffler plate and the compressor top cover, and one side of the ring-shaped connecting end is connected to the compressor top cover and the other side is connected to the compressor housing. The ring-shaped connecting end is used to assist in positioning the muffler plate, and at the same time, it is conducive to connecting the muffler plate and the compressor top cover to form an oil pool for collecting return oil lubricating oil.

[0009] Preferably, the muffler is an arched plate, the muffler is bent upward, and the center of curvature of the muffler is located on the side away from the oil control assembly. Designing the shape of the muffler as an arched plate is conducive to the lubricating oil sliding from the upwardly bent side of the muffler into the oil pool for collecting the lubricating oil; increasing the contact area between the muffler and the outer shell of the check valve, improving the sealing of the contact surface, preventing the lubricating oil mist and the refrigerant mixture from directly returning to the oil without passing through the oil control assembly, and preventing the lubricating oil from effectively lubricating the friction pair of the scroll compressor.

[0010] Preferably, the apex of the muffler plate is flush with the lower plane of the oil control assembly. Reducing the volume of the scroll compressor is conducive to collecting the lubricating oil mist and refrigerant mixture processed by the oil control assembly into the oil pool, thereby improving the oil circulation rate of the scroll compressor.

[0011] The utility model adopts the above-mentioned arrangement to achieve the following beneficial effects: the oil circulation rate of the scroll compressor is appropriately reduced, and the refrigeration efficiency of the compressor is improved; the lubricating oil mist and refrigerant mixture filtered by the oil control component flows back to the low-pressure side through the oil return channel, re-lubricates the friction pair of the compressor, and improves the reliability of the whole machine; the silencer plate reduces the vibration noise generated by the scroll compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a cross-sectional view of the scroll compressor of the utility model;

[0013] Figure 2 It is an enlarged view of the top of the scroll compressor of the utility model;

[0014] Figure 3 It is a partial enlarged view of the oil return passage of the scroll compressor of the utility model;

[0015] Figure 4 A cross-sectional view of another embodiment of the scroll compressor of the utility model;

[0016] Figure 5 It is an enlarged view of the top of another embodiment of the scroll compressor of the utility model;

[0017] Figure 6 This is a partial enlarged view of the oil return passage of another embodiment of the scroll compressor of the utility model.

[0018] Legend: compressor top cover 1; oil control assembly 2; silencer 3; compressor housing 4; seal 5; annular connection end 6; oil return hole 7; oil return block 8. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the present utility model clearer, the technical scheme in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0020] Example 1

[0021] Combination Figure 1 and Figure 2As shown, in this embodiment, a scroll compressor oil return structure is provided, which is mainly composed of a silencer plate 3 and a compressor top cover 1, and is intended to reduce the vibration noise of the scroll compressor, improve the lubrication effect of the return oil, and ensure the normal operation of the compressor. The silencer plate 3 is provided with ends on both sides connected to the bottom of the compressor top cover 1 to form an annular oil pool, and the annular oil pool is used to receive the lubricating oil that reduces the refrigerant content after passing through the oil control component 2; the bottom of the silencer plate 3 is provided with an oil return hole 7, one end of the oil return hole 7 is connected to the lower part of the oil pool, and the other end is connected to the low-pressure side of the scroll compressor, and the diameter of the oil return hole 7 at the bottom of the silencer plate 3 is 1.2 mm; the oil return structure includes an oil control component 2, and the oil control component 2 is located above the silencer plate 3 and the liquid level of the oil pool.

[0022] Through the above-mentioned arrangement, the silencer plate 3 is used to reduce the vibration noise generated by the scroll compressor. At the same time, the silencer plate 3 is connected to the compressor top cover 1 to form an annular oil pool to store the lubricating oil mist and refrigerant mixture whose refrigerant ratio is reduced by the oil control component 2. This can not only reduce noise, but also improve the lubrication effect and save lubricating oil. Moreover, the structure is simple, and the installation and maintenance are convenient. The oil control component 2 is used to reduce the lubricating oil mist and refrigerant mixture whose refrigerant ratio is reduced, thereby improving the lubrication effect of the return oil. The diameter of the oil return through hole 7 is controlled at 1.2 mm to control the amount of lubricating oil replenished per unit time, thereby avoiding the waste of lubricating oil and ensuring that there is enough lubricating oil to lubricate the friction pair to ensure the normal operation of the scroll compressor.

[0023] To further enhance the lubrication effect of the return oil, the present embodiment also includes an oil control component 2, which is located above the silencer plate 3 and the oil pool liquid level, and can reduce the proportion of the refrigerant in the passing lubricating oil mist and refrigerant mixture, thereby improving the lubrication performance of the return oil.

[0024] like Figure 2 As shown, in this embodiment, the scroll compressor includes a check valve and a muffler 3. The check valve can prevent the refrigerant from flowing backward inside the compressor to ensure the normal operation of the system. The muffler 3 is annular, and the inner ring of the muffler 3 is in contact with the outer shell of the check valve, and the outer ring of the muffler 3 is connected to the compressor top cover 1. Compared with the traditional design, the outer shell of the check valve in the new design is in contact with the inner ring of the annular muffler 3. This structure is conducive to reducing noise transmission and making the compressor run more smoothly. The muffler 3 and the compressor top cover 1 form an oil pool. The oil pool collects the lubricating oil sprayed by the check valve and processed by the oil control component 2, which is conducive to oil return lubrication of the scroll compressor and improves the reliability of the scroll compressor.

[0025] A seal 5 is provided at the contact surface between the muffler plate 3 and the outer shell of the check valve. The seal 5 is used to improve the sealing between the muffler plate 3 and the outer shell of the check valve to prevent the newly added lubricating oil from mixing with the lubricating oil mist and refrigerant mixture sprayed from the check valve, mainly to prevent the lubricating oil mist and refrigerant mixture from directly returning to the oil without passing through the oil control component 2 and the lubricating oil from not effectively lubricating the friction pair of the scroll compressor.

[0026] The scroll compressor includes a fixed scroll and a movable scroll. When the compressor is working, the fixed scroll is fixed, and the movable scroll is driven by the motor to mesh with the fixed scroll. The crankshaft inside the scroll compressor rotates under the drive of the motor, forming a mixture of refrigerant and lubricating oil mist inside the compressor. The mixture is sucked into the compression chamber by the passive disk, and then enters the exhaust chamber and circulates in the refrigeration system. If not controlled, the oil circulation rate of the entire compressor will be relatively high. As the compressor runs, more and more lubricating oil is brought into the refrigeration system, which affects the lubrication of the compressor and the reliability of the compressor. Therefore, it is necessary to separate the discharged refrigerant and lubricating oil mist mixture, reduce the proportion of oil mist, separate the oil mist into liquid lubricating oil and directly return it to the oil pool of the compressor to lubricate the friction pair. The arrow in the figure is part of the return oil circuit.

[0027] like Figure 2 As shown, in this embodiment, the muffler plate 3 is designed to be arched, and its upwardly curved shape allows the lubricating oil to slide more easily from one side of the muffler plate 3 into the oil pool for collecting the lubricating oil. This design is conducive to improving the flow efficiency of the lubricating oil, thereby reducing the operating noise of the scroll compressor. In addition, the design of the arched muffler plate 3 can also increase the contact area between it and the outer shell of the check valve, thereby improving the sealing performance of the contact surface.

[0028] Such a design has the following advantages: First, it can prevent the lubricating oil mist and refrigerant mixture from directly returning to the oil without being processed by the oil control component 2, so as to ensure that the oil mist mixture is effectively processed. Secondly, this design helps the lubricating oil to better lubricate the friction pair of the scroll compressor, thereby reducing the wear of the compressor and extending its service life. Finally, the design of the arched silencer plate 3 can also reduce the overall volume of the scroll compressor, making it more compact and easy to install and use.

[0029] In this process, the top of the silencer plate 3 is kept flush with the lower plane of the oil control assembly 2, which ensures that the lubricating oil can smoothly slide from one side of the silencer plate 3 into the oil pool. At the same time, this design also helps to improve the oil circulation rate of the scroll compressor, so that the lubricating oil can circulate better in the compressor and achieve a better lubrication effect. Designing the silencer plate 3 as an arch plate and bending it upward can effectively improve the collection efficiency of the lubricating oil, reduce the volume of the compressor, and improve the operating efficiency and life of the compressor.

[0030] like Figure 3 As shown, the scroll compressor includes a compressor housing 4, and an annular connecting end 6 is provided at the connection between the muffler plate 3 and the compressor top cover 1, and one side of the annular connecting end 6 is connected to the compressor top cover 1 and the other side is connected to the compressor housing 4. The annular connecting end 6 is used to assist in positioning the muffler plate 3, and at the same time, it is beneficial to connect the muffler plate 3 and the compressor top cover 1 to form an oil pool for collecting the return oil lubricating oil.

[0031] Example 2

[0032] Combination Figure 4 and Figure 5 As shown, in the present embodiment, another scroll compressor oil return structure is provided, the oil return structure includes a silencer 3 and a compressor top cover 1, both sides of the silencer 3 are provided with ends connected to the bottom of the compressor top cover 1 to form an annular oil pool; the bottom of the silencer 3 is provided with an oil return through hole 7, the bottom of the silencer 3 is provided with an oil return block 8 fixed on the silencer 3, the oil return through hole 7 is arranged in the oil return block 8, the length of the oil return block 8 is greater than the thickness of the silencer 3, one end of the oil return through hole 7 is connected to the lower part of the oil pool, and the other end is connected to the low-pressure side of the scroll compressor; the oil return structure includes an oil control component 2, and the oil control component 2 is located above the silencer 3 and the liquid level of the oil pool.

[0033] In this embodiment, a silencer plate 3 is used to reduce the vibration noise generated by the scroll compressor. At the same time, the silencer plate 3 is connected to the compressor top cover 1 to form an annular oil pool to store the lubricating oil mist and refrigerant mixture whose refrigerant ratio has been reduced by the oil control component 2; the oil control component 2 is used to reduce the refrigerant ratio in the lubricating oil mist and refrigerant mixture, thereby improving the lubrication effect of the return oil; an oil return block 8 fixed to the silencer plate 3 by bolts is provided at the bottom of the silencer plate 3, and the oil return block 8 that can be separated from the silencer plate 3 is used, which is conducive to the processing and setting of the oil return through hole 7, changing the oil outlet position of the return oil, making the lubricating oil of the return oil close to the axial position, and improving the lubrication effect of the lubricating oil.

[0034] like Figure 6 As shown, the scroll compressor includes a compressor housing 4, and an annular connecting end 6 is provided at the connection between the muffler plate 3 and the compressor top cover 1, and one side of the annular connecting end 6 is connected to the compressor top cover 1 and the other side is connected to the compressor housing 4. The annular connecting end 6 is used to assist in positioning the muffler plate 3, and at the same time, it is beneficial to connect the muffler plate 3 and the compressor top cover 1 to form an oil pool for collecting return oil lubricating oil. The diameter of the return oil through hole 7 at the bottom of the muffler plate 3 is 1.0 mm. Using a suitable diameter of the return oil through hole 7 to control the amount of lubricating oil replenished per unit time can ensure the normal operation of the scroll compressor and avoid wasting lubricating oil.

[0035] like Figure 4As shown, the scroll compressor includes a check valve, the muffler plate 3 is annular, the inner ring of the muffler plate 3 is in contact with the outer shell of the check valve, and the outer ring of the muffler plate 3 is connected to the compressor top cover 1. The muffler plate 3 and the compressor top cover 1 form an oil pool, and the oil pool collects the lubricating oil sprayed from the check valve and processed by the oil control component 2, which is beneficial to oil return lubrication of the scroll compressor and improves the reliability of the scroll compressor.

[0036] A seal 5 is provided at the contact surface between the muffler plate 3 and the outer shell of the check valve. The seal 5 is used to improve the sealing between the muffler plate 3 and the outer shell of the check valve to prevent the newly added lubricating oil from mixing with the lubricating oil mist and refrigerant mixture sprayed from the check valve, mainly to prevent the lubricating oil mist and refrigerant mixture from directly returning to the oil without passing through the oil control component 2 and the lubricating oil from not effectively lubricating the friction pair of the scroll compressor.

[0037] The scroll compressor includes a fixed scroll and a movable scroll. When the compressor is working, the fixed scroll is fixed, and the movable scroll is driven by the motor to mesh with the fixed scroll. The crankshaft inside the scroll compressor rotates under the drive of the motor, forming a mixture of refrigerant and lubricating oil mist inside the compressor. The mixture is sucked into the compression chamber by the passive disk, and then enters the exhaust chamber and circulates in the refrigeration system. If not controlled, the oil circulation rate of the entire compressor will be relatively high. As the compressor runs, more and more lubricating oil is brought into the refrigeration system, which affects the lubrication of the compressor and the reliability of the compressor. Therefore, it is necessary to separate the discharged refrigerant and lubricating oil mist mixture, reduce the proportion of oil mist, separate the oil mist into liquid lubricating oil and directly return it to the oil pool of the compressor to lubricate the friction pair. The arrow in the figure is part of the return oil circuit.

[0038] The muffler plate 3 is an arch plate, and the muffler plate 3 is bent upward, and the curvature center of the muffler plate 3 is located on the side away from the oil control component 2. The muffler plate 3 is designed to be an arch plate, which is conducive to the lubricating oil sliding from the upwardly bent side of the muffler plate 3 into the oil pool for collecting the lubricating oil; the contact area between the muffler plate 3 and the outer shell of the check valve is increased, and the non-sealing property of the contact surface is improved, so as to prevent the lubricating oil mist and the refrigerant mixture from directly returning to the oil without passing through the oil control component 2, and the lubricating oil from not effectively lubricating the friction pair of the scroll compressor.

[0039] The vertex of the muffler plate 3 is flush with the lower plane of the oil control assembly 2. Such a design is intended to reduce the overall volume of the scroll compressor, thereby optimizing its performance, and is also conducive to improving the efficiency and stability of the compressor; the lubricating oil can smoothly slide from one side of the muffler plate 3 into the oil pool, which is conducive to collecting the oil mist mixture containing the refrigerant after being processed by the oil control assembly 2 into the oil pool, thereby improving the oil circulation rate of the scroll compressor.

[0040] The utility model adopts the above-mentioned arrangement to solve the problem that the oil return channel of the prior art needs to open a large number of oil return holes on each component, which is difficult to produce and has a long production cycle; the lubricating oil mist is easily mixed with the refrigerant to form a mixture, and the higher the proportion of the refrigerant in the mixture, the worse the lubrication effect on the compressor after the oil returns; the oil return channel is straight, the oil return efficiency is low, and the scroll compressor is relied on to throw the lubricating oil mist and the refrigerant mixture into the oil return channel, and has the following beneficial effects: appropriately reducing the oil circulation rate of the scroll compressor and improving the refrigeration efficiency of the compressor; the oil mist mixture filtered by the oil control component 2 flows back to the low-pressure side through the oil return channel, re-lubricates the friction pair of the compressor, and improves the reliability of the whole machine; the silencer plate 3 reduces the vibration noise generated by the scroll compressor.

[0041] The specific embodiments described herein are merely examples of the spirit of the present invention. A person skilled in the art of the present invention may make various modifications or additions to the specific embodiments described or replace them in a similar manner, but this will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A scroll compressor oil return structure, characterized in that: The oil return structure includes a muffler plate and a compressor top cover, and ends are provided on both sides of the muffler plate to connect with the bottom of the compressor top cover to form an annular oil pool; An oil return hole is provided at the bottom of the muffler plate, one end of the oil return hole is connected to the lower part of the oil pool, and the other end is connected to the low-pressure side of the scroll compressor; The oil return structure comprises an oil control component, and the oil control component is located above the silencer plate and the liquid level of the oil pool.

2. The scroll compressor oil return structure according to claim 1, characterized in that: An oil return block fixed on the silencer plate is provided at the bottom of the silencer plate, the oil return through hole is arranged in the oil return block, and the length of the oil return block is greater than the thickness of the silencer plate.

3. A scroll compressor oil return structure according to claim 1 or 2, characterized in that: The diameter of the oil return through hole at the bottom of the muffler plate is less than 1.5 mm.

4. The scroll compressor oil return structure according to claim 3, characterized in that: The scroll compressor comprises a check valve, the muffler plate is annular, the inner ring of the muffler plate is in contact with the outer shell of the check valve, and the outer ring of the muffler plate is connected to the compressor top cover.

5. The scroll compressor oil return structure according to claim 4, characterized in that: A sealing member is provided at the contact surface between the muffler plate and the outer shell of the check valve.

6. The scroll compressor oil return structure according to claim 5, characterized in that: The scroll compressor comprises a compressor housing, and a ring-shaped connecting end is provided at the connection between the muffler plate and the compressor top cover, wherein one side of the ring-shaped connecting end is connected to the compressor top cover and the other side is connected to the compressor housing.

7. The scroll compressor oil return structure according to claim 5, characterized in that: The muffler plate is an arch plate, the muffler plate is bent upward, and the curvature center of the muffler plate is located at a side away from the oil control component.

8. The scroll compressor oil return structure according to claim 7, characterized in that: The apex of the muffler plate is flush with the lower plane of the oil control component.

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