Oil separator and compressor

Abstract

The present disclosure provides an oil separation device and a compressor. The oil separation device is arranged on the exhaust side of the compressor, and includes: a compressor end cover, a first oil separation structure and a second oil separation structure are arranged in the compressor end cover; the first oil separation structure and the second oil separation structure are arranged in series along the exhaust flow direction of the compressor, and the oil-gas mixture discharged from the compressor enters the first oil separation structure for oil-gas separation, and then enters the second oil separation structure for oil-gas separation again. The oil separation device of the present disclosure adopts a two-stage oil separation mode, and a two-stage oil separation structure is arranged in the end cover of the compressor. The first oil separation structure and the second oil separation structure are connected in series with the exhaust port of the compressor, and the refrigerant gas discharged from the compressor is separated from the oil and gas twice, thereby improving the effect of gas-liquid separation, reducing the oil content of the refrigerant gas discharged from the compressor, and avoiding that the friction pair of the compressor cannot be effectively lubricated and affects the long-term reliability of the compressor.

Description

Technical Field

[0001] The present invention belongs to the technical field of compressors, and in particular relates to an oil separation device and a compressor. Background Art

[0002] At present, electric scroll compressors are widely used in air-conditioning systems of new energy vehicles. There are many wear parts in the compressor during operation. If the wear cannot be effectively alleviated, the efficiency of the compressor will be greatly reduced, and in severe cases, the long-term reliability of the compressor will be affected. In the compressor, the lubricating oil liquid and the refrigerant gas exist in a mixed form and circulate in the system. In view of this, corresponding components are required to separate the lubricating oil liquid from the refrigerant gas, and let the lubricating oil liquid flow back into the compressor to lubricate the corresponding friction pairs, rather than discharge the compressor with the gas. A common solution is to install an oil separation device on the exhaust side of the compressor. The separation principle of the device is: after the high-pressure gas-liquid mixed fluid is discharged from the compressor pump body, the gas-liquid mixed fluid spirally descends around the outer wall of the separator when passing through the cyclone separator along the exhaust port. In this process, the lubricating oil liquid is thrown to the inner wall of the head cover under the action of centrifugal force, and flows into the oil pool along the inner wall of the head cover and flows back to the compressor along the oil return channel. The refrigerant gas flows upward along the inside of the separator and finally discharges the compressor.

[0003] However, this oil separation device has the problem of incomplete gas-liquid separation, and the refrigerant gas discharged from the compressor has a high oil content, which results in the friction pair of the compressor not being lubricated, affecting the long-term reliability of the compressor. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present disclosure is that the gas-liquid separation of the compressor is not complete, which affects the long-term reliability of the compressor, and thus an oil separation device and a compressor are provided.

[0005] In order to solve the above problems, the present disclosure provides an oil separation device, which is arranged on the exhaust side of a compressor, and comprises: a compressor end cover, wherein a first oil separation structure and a second oil separation structure are arranged in the compressor end cover;

[0006] The first oil separation structure and the second oil separation structure are arranged in series along the exhaust flow direction of the compressor. The oil-gas mixture discharged from the compressor enters the first oil separation structure for oil-gas separation, and then enters the second oil separation structure for oil-gas separation again.

[0007] The purpose of the present disclosure and the solution of its technical problems can also be further achieved by adopting the following technical measures.

[0008] In some embodiments, the compressor end cover includes a first end cover and a second end cover, the first end cover is connected to the casing of the compressor, the second end cover is connected to the axial outer side of the first end cover, the first oil separation structure is arranged on the first end cover, and the second oil separation structure is arranged on the second end cover.

[0009] In some embodiments, the first oil separation structure includes at least one of a cyclone oil separator and a labyrinth oil separator, and the second oil separation structure includes at least one of a cyclone oil separator and a labyrinth oil separator.

[0010] In some embodiments, the first oil separation structure includes a cyclone oil separator, and the second oil separation structure includes a labyrinth oil separator.

[0011] In some embodiments, the second oil separation structure includes an oil separation channel, and a labyrinth structure is provided in the oil separation channel, and the labyrinth structure enables the mixed gas to complete oil-gas separation.

[0012] In some embodiments, the maze structure includes at least two first baffles and at least two second baffles, and the first baffles and the second baffles divide the oil separation channel into non-linear air flow channels.

[0013] In some embodiments, the at least two first baffles are arranged on one side of the inner wall of the oil channel at intervals along the flow direction of the mixed gas, and the at least two second baffles are arranged on the opposite side of the inner wall of the oil channel at intervals along the flow direction of the mixed gas, and the first baffles and the second baffles are arranged alternately along the flow direction of the mixed gas, and the first baffles and the second baffles divide the oil channel into a serpentine airflow channel.

[0014] In some embodiments, an oil collecting groove is provided on the inner wall of the oil separation channel, and the oil collecting groove is constructed to collect the lubricating oil separated by the maze structure to the bottom of the oil separation channel. A first channel is also provided in the second end cover, and the first channel is connected to the oil collecting groove. The first channel is constructed to discharge the lubricating oil in the oil collecting groove out of the oil separation channel.

[0015] In some embodiments, the oil separation channel is arranged obliquely along the flow direction of the mixed gas, so that the lubricating oil separated by the maze structure can flow to the end of the oil separation channel under the action of gravity.

[0016] In some embodiments, a first oil storage tank is further provided in the first end cover, and the first oil storage tank is connected to the oil tank in the compressor. A second oil storage tank is further provided in the second end cover, and the second oil storage tank is connected to the oil tank in the compressor.

[0017] In some embodiments, the second end cover includes an end plate, an edge of the end plate is provided with an annular wall protruding axially, the second end cover is axially installed on the outside of the first end cover, the end plate, the annular wall and the first end cover together form the second oil storage tank, the annular wall is also provided with a protrusion protruding toward the second oil storage tank, and when an oil separation channel is included, the oil separation channel is arranged on the protrusion.

[0018] In some embodiments, the first oil reservoir is in communication with the second oil reservoir.

[0019] In some embodiments, an oil drain pipe is provided on the first end cover, the oil drain pipe connects the first oil reservoir and the second oil reservoir, and the oil drain pipe is configured to transport the lubricating oil in the first oil reservoir that exceeds a preset liquid level to the second oil reservoir.

[0020] A compressor comprises the above-mentioned oil separation device.

[0021] The oil separation device and compressor provided by the present disclosure have at least the following beneficial effects:

[0022] The oil separation device disclosed in the present invention aims to solve the problems of incomplete gas-liquid separation and high oil content in refrigerant gas in scroll compressors by adopting a two-stage oil separation mode. A two-stage oil separation structure is arranged in the end cover of the compressor. The first oil separation structure and the second oil separation structure are connected in series with the exhaust port of the compressor. The refrigerant gas discharged from the compressor is subjected to two oil-gas separations, thereby improving the gas-liquid separation effect, reducing the oil content in the refrigerant gas discharged from the compressor, and preventing the friction pair of the compressor from being ineffectively lubricated, which affects the long-term reliability of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of a compressor according to an embodiment of the present disclosure;

[0024] Figure 2 is a schematic structural diagram of a first end cover according to an embodiment of the present disclosure;

[0025] Figure 3 is a schematic structural diagram of a second end cover according to an embodiment of the present disclosure;

[0026] Figure 4 The structure of the labyrinth oil separator of the embodiment of the present disclosure is shown in FIG. Figure 1 ;

[0027] Figure 5 The structure of the labyrinth oil separator of the embodiment of the present disclosure is shown in FIG. Figure 1 ;

[0028] Figure 6 It is a structural schematic diagram of a labyrinth oil separator according to another embodiment of the present disclosure;

[0029] Figure 7 This is a schematic structural diagram of a second end cover according to another embodiment of the present disclosure;

[0030] Figure 8 It is a schematic structural diagram of the second channel and the third channel of another embodiment of the present disclosure.

[0031] The reference numerals are:

[0032] 1. First oil separation structure; 2. Second oil separation structure; 3. First end cover; 4. Second end cover; 5. Shell; 6. Oil separation channel; 7. Labyrinth structure; 8. First baffle; 9. Second baffle; 10. Oil collecting groove; 11. First channel; 12. First oil storage tank; 13. Second oil storage tank; 14. End plate; 15. Annular wall; 16. Protrusion; 17. Oil drain pipe; 18. First exhaust port; 19. Cyclone exhaust port; 20. Sealing plug; 21. Oil outlet; 22. Second exhaust port; 23. Semicircular labyrinth oil separator; 23. Second channel; 24. Third channel. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the technical solutions of the present disclosure will be clearly and completely described below in combination with the specific embodiments of the present disclosure and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0034] Combination Figures 1 to 8 As shown, the disclosed embodiment provides an oil separation device, which is arranged on the exhaust side of the compressor, and includes: a compressor end cover, the pump body of the compressor is composed of a fixed scroll and a movable scroll, and the compressor flows out along the exhaust port of the pump body after completing the compression of the refrigerant, and then enters the compressor end cover through the first exhaust port 18. A first oil separation structure 1 and a second oil separation structure 2 are arranged in series in the compressor end cover; the first oil separation structure 1 and the second oil separation structure 2 are arranged in series along the exhaust flow direction of the compressor, and the oil-gas mixture discharged from the compressor enters the first oil separation structure 1 for oil-gas separation, and then enters the second oil separation structure 2 for oil-gas separation again.

[0035] The oil separation device of the disclosed embodiment adopts a two-stage oil separation mode to address the problems of incomplete gas-liquid separation and high oil content in the refrigerant gas in the scroll compressor in the prior art. A two-stage oil separation structure is arranged in the end cover of the compressor. The first oil separation structure 1 and the second oil separation structure 2 are connected in series with the exhaust port of the compressor. The refrigerant gas discharged from the compressor is separated from the oil and gas twice, thereby improving the efficiency of oil-gas separation in the compressor, reducing the oil content of the refrigerant gas discharged from the compressor, improving the lubrication conditions of the friction pairs in the compressor, and ensuring the long-term reliability of the compressor operation.

[0036] In some embodiments, the compressor end cover includes a first end cover 3 and a second end cover 4, wherein the first end cover 3 is connected to the housing 5 of the compressor, the second end cover 4 is connected to the axial outer side of the first end cover 3, the first oil separation structure 1 is arranged on the first end cover 3, and the second oil separation structure 2 is arranged on the second end cover 4. The second end cover 4 and the first end cover 3 are fixed by screw connection, and sealing is achieved by sealing gasket.

[0037] In this embodiment, the compressor end cover is divided into two parts, wherein the first oil separation structure 1 is arranged in the first end cover 3, and the second oil separation structure 2 is arranged in the second end cover 4, which can simplify the structural complexity of a single end cover and realize split processing, thereby avoiding the problem of excessively complicated processing technology and resulting in excessively high processing costs.

[0038] In some embodiments, the first oil separation structure 1 includes at least one of a cyclone oil separator and a labyrinth oil separator, and the second oil separation structure 2 includes at least one of a cyclone oil separator and a labyrinth oil separator. Preferably, the first oil separation structure 1 includes a cyclone oil separator, and the second oil separation structure 2 includes a labyrinth oil separator.

[0039] In this embodiment, after the mixed gas is discharged from the first exhaust port 18, it is actually in a state of oil and gas mixture under high pressure. When the high-speed fluid discharged from the first exhaust port 18 hits the outer wall of the cyclone oil separator, it spirals downward around it in a downward direction. The lubricating oil will be separated from the mixed gas under the action of centrifugal force and thrown onto the inner wall of the first end cover 3, and then flow to the bottom along the inner wall under the action of gravity. The gas will flow upward from the channel in the middle of the cyclone oil separator to the cyclone exhaust port 19. However, the oil will not be separated 100%, and a part of the oil will be mixed in the outflowing gas. At this time, the separated refrigerant gas flows through the cyclone exhaust port 19 and the second exhaust port 22 into the second end cover 4 for further separation. After the lubricating oil separated by the cyclone oil separator flows to the first oil storage tank 12 at the bottom of the first end cover 3 under the action of gravity, it can return to the compressor along the second channel to continue to lubricate the friction pair of the compressor.

[0040] At the same time, in order to isolate the refrigerant from the outside, a sealing plug 20 is placed in the radial outlet of the first end cover 3 to seal the first separation structure, so that all the refrigerant mixed gas enters the second separation structure in the second end cover 4 for secondary oil-gas separation.

[0041] In some embodiments, the second oil separation structure 2 includes an oil separation channel 6, and a labyrinth structure 7 is provided in the oil separation channel 6. The labyrinth structure 7 enables the mixed gas to complete oil-gas separation.

[0042] In this embodiment, the second oil separation structure 2 adopts a labyrinth oil separator, and with the help of a labyrinth structure 7 arranged in the oil separation channel 6, the refrigerant mixed gas and lubricating oil can be separated. It can achieve secondary oil and gas separation while avoiding a large pressure drop on the compressor exhaust. It has been verified that when the exhaust pressure at the second exhaust port 22 is 1.9MPa, the exhaust pressure at the outlet of the labyrinth oil separator is 1.89MPa, and the pressure drop loss is very small.

[0043] In some embodiments, the labyrinth structure 7 includes at least two first baffles 8 and at least two second baffles 9, and the first baffles 8 and the second baffles 9 divide the oil separation channel 6 into non-linear air flow channels.

[0044] Preferably, the at least two first baffles 8 are arranged at intervals on one side of the inner wall of the oil channel 6 along the flow direction of the mixed gas, and the at least two second baffles 9 are arranged at intervals on the opposite side of the inner wall of the oil channel 6 along the flow direction of the mixed gas, and the first baffles 8 and the second baffles 9 are arranged alternately along the flow direction of the mixed gas, and the first baffles 8 and the second baffles 9 divide the oil channel 6 into a serpentine airflow channel.

[0045] In the labyrinth oil separator, two rows of baffles are arranged in the direction of vertical flow of the oil-gas mixed fluid, which are interlaced and divided. The number of baffles can be taken according to the design requirements. According to the knowledge of fluid mechanics, when the gas flows from a larger cavity to a smaller cavity, its flow rate will increase due to the decrease in the cross-sectional area through the cavity, and the faster the flow rate of the mixed fluid when it hits the baffle, the easier it is for the oil droplets to be separated. Based on this principle, when the mixed fluid flows through the labyrinth separator and hits each baffle in the flow direction, the droplets will separate and fall into the bottom of the oil separation channel 6 under the action of gravity along the tangent direction of the baffle. This process is repeated until the gas flows out of the right side of the oil separation channel 6 and then discharged from the compressor.

[0046] In some embodiments, an oil collecting groove 10 is provided on the inner wall of the bottom of the oil separation channel 6 along the vertical direction, and the oil collecting groove 10 is constructed to collect the lubricating oil separated by the maze structure 7 to the bottom of the oil separation channel 6. A first channel 11 is also provided in the second end cover 4, and the first channel 11 is connected to the oil collecting groove 10. The first channel 11 is constructed to discharge the lubricating oil in the oil collecting groove 10 from the oil separation channel 6 to the second oil storage tank 13 or directly return to the inside of the compressor.

[0047] In this embodiment, the oil separated by the labyrinth oil separator flows to the bottom of the oil separation channel 6 under the action of gravity. An oil collecting groove 10 is provided on the bottom inner wall of the oil separation channel 6. The oil collecting groove 10 collects and temporarily accommodates all the oil dripping from the baffle, and transports the oil to the first channel 11, and then transports the oil to the second oil storage tank 13 by the first channel 11, or directly transports it back to the compressor.

[0048] In some embodiments, the oil separation channel 6 is inclined along the flow direction of the mixed gas, so that the lubricating oil separated by the labyrinth structure 7 can flow to the end of the oil separation channel 6 under the action of gravity. Optionally, the oil separation channel 6 is gradually inclined upward along the airflow direction, or gradually inclined downward along the airflow direction, both of which can achieve the effect of collecting the lubricating oil to the end of the oil separation channel 6.

[0049] Preferably, the oil channel 6 is gradually inclined upward, and the flow direction of the lubricating oil is opposite to the flow direction of the airflow to prevent the oil from being entrained by the airflow again. At the same time, the first channel 11 can also be directly opened on the end face of the second end cover 4 to reduce the processing difficulty.

[0050] Preferably, the inclination angle of the oil channel 6 is in the range of 1° to 2° to facilitate processing and assembly.

[0051] In some embodiments, a first oil reservoir 12 is further provided in the first end cover 3, and the first oil reservoir 12 is connected to the oil pool in the compressor, and a second oil reservoir 13 is further provided in the second end cover 4, and the second oil reservoir 13 is connected to the oil pool in the compressor through a third channel. Preferably, the third channel sequentially penetrates the second end cover 4 and the first end cover 3 and then enters the interior of the compressor.

[0052] In some embodiments, the second end cover 4 includes an end plate 14, and the edge of the end plate 14 is provided with an axially protruding annular wall 15, and the second end cover 4 is axially installed on the outside of the first end cover 3. The end plate 14, the annular wall 15, and the first end cover 3 together form the second oil storage tank 13, and the annular wall 15 is also provided with a protrusion 16 protruding toward the second oil storage tank 13. When the oil separation channel 6 is included, the oil separation channel 6 is arranged on the protrusion 16.

[0053] Furthermore, considering the rationality of processing, the labyrinth structure 7 also includes a cylindrical member, which is formed by splicing two semi-cylindrical cylinders, and the first baffle 8 and the second baffle 9 are respectively arranged inside the semi-cylindrical cylinders, and then merged together to form a cylinder, and are pressed together into the oil distribution channel 6 of the second end cover 4. The oil collection groove 10 is arranged on the inner wall of the cylindrical member, and the cylindrical member is provided with an oil outlet 21, and the oil outlet 21 is connected to the first channel 11.

[0054] In some embodiments, the labyrinth separator may be in a cylindrical, semi-cylindrical, rectangular or other shape, and the corresponding oil separation channel 6 may also be in a cylindrical, semi-cylindrical or rectangular shape. Figure 7 A structure of the second end cover 4 having a semicircular labyrinth oil separator 23 is shown.

[0055] In the related art, when the accumulated oil level in the first oil storage tank 12 rises and submerges the inlet at the bottom of the cyclone separator, the separation effect of the cyclone separator will be greatly weakened or even fail, resulting in the compressor friction pair not being lubricated, affecting the long-term reliability of the compressor.

[0056] Therefore, in some embodiments, the first oil reservoir 12 is connected to the second oil reservoir 13. Preferably, an oil drain pipe 17 is provided on the first end cover 3, and the oil drain pipe 17 connects the first oil reservoir 12 and the second oil reservoir 13, and the oil drain pipe 17 is configured to be able to transport the lubricating oil in the first oil reservoir 12 that exceeds the preset liquid level to the second oil reservoir 13. When the oil level of the first oil reservoir 12 in the first end cover 3 is higher than the bottom opening of the cyclone separator, the lubricating oil will flow into the second oil reservoir 13 in the second end cover 4 along the oil drain pipe 17, and flow back into the compressor together with the oil separated by the labyrinth separator.

[0057] In some embodiments, the second channel 23 and the third channel 24 are provided with a certain slope, that is, the horizontal height gradually decreases from the first oil reservoir 12 or the second oil reservoir 13 to the oil pool inside the compressor, so as to ensure the smooth flow of the lubricating oil liquid and improve the reflux efficiency of the lubricating oil in the oil reservoir. Optionally, the third channel 24 returns the lubricating oil to the compressor after merging with the second channel 23. Figure 1 As shown, the third channel 24 and the second channel 23 can also be arranged in parallel to return the lubricating oil to the compressor. Figure 8 The former solution can reduce the number of channels opened inside the compressor and simplify the processing technology of the compressor.

[0058] The embodiment of the present disclosure also provides a compressor, comprising the above-mentioned oil separation device.

[0059] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0060] The above are only preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure. The above are only preferred implementations of the present disclosure. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present disclosure, and these improvements and variations should also be regarded as the protection scope of the present disclosure.

Claims

1. An oil separation device, arranged on the exhaust side of a compressor, characterized in that: include: A compressor end cover, wherein a first oil separation structure (1) and a second oil separation structure (2) are provided in the compressor end cover; The first oil separation structure (1) and the second oil separation structure (2) are arranged in series along the exhaust flow direction of the compressor, and the oil-gas mixture discharged from the compressor enters the first oil separation structure (1) for oil-gas separation, and then enters the second oil separation structure (2) for oil-gas separation again; The compressor end cover comprises a first end cover (3) and a second end cover (4), the first end cover (3) being connected to a housing (5) of the compressor, the second end cover (4) being connected to an axially outer side of the first end cover (3), the first oil separation structure (1) being arranged on the first end cover (3), and the second oil separation structure (2) being arranged on the second end cover (4); The second oil separation structure (2) comprises an oil separation channel (6), wherein a labyrinth structure (7) is provided in the oil separation channel (6), and the labyrinth structure (7) enables the mixed gas to complete oil-gas separation; A first oil reservoir (12) is also provided in the first end cover (3), the first oil reservoir (12) is connected to the oil reservoir in the compressor, and the first oil reservoir (12) is capable of storing the lubricating oil separated by the first oil separation structure (1); a second oil reservoir (13) is also provided in the second end cover (4), the second oil reservoir (13) is connected to the oil reservoir in the compressor, and the second oil reservoir (13) is capable of storing the lubricating oil separated by the second oil separation structure (2); The second end cover (4) comprises an end plate (14), the edge of the end plate (14) is provided with an annular wall (15) protruding in the axial direction, the second end cover (4) is axially mounted on the outer side of the first end cover (3), the end plate (14), the annular wall (15) and the first end cover (3) together enclose the second oil reservoir (13), the annular wall (15) is further provided with a protrusion (16) protruding toward the inside of the second oil reservoir (13), and the oil separation channel (6) is arranged on the protrusion (16); The first oil storage tank (12) is connected to the second oil storage tank (13).

2. The oil separation device according to claim 1, characterized in that: The first oil separation structure (1) includes at least one of a cyclone oil separator and a labyrinth oil separator, and the second oil separation structure (2) includes at least one of a cyclone oil separator and a labyrinth oil separator.

3. The oil separation device according to claim 2, characterized in that: The first oil separation structure (1) comprises a cyclone oil separator, and the second oil separation structure (2) comprises a labyrinth oil separator.

4. The oil separation device according to claim 1, characterized in that: The labyrinth structure (7) comprises at least two first baffles (8) and at least two second baffles (9), wherein the first baffles (8) and the second baffles (9) separate the oil separation channel (6) into non-linear air flow channels.

5. The oil separation device according to claim 4, characterized in that: The at least two first baffles (8) are arranged at intervals on one side of the inner wall of the oil separation channel (6) along the flow direction of the mixed gas, and the at least two second baffles (9) are arranged at intervals on the opposite side of the inner wall of the oil separation channel (6) along the flow direction of the mixed gas. The first baffles (8) and the second baffles (9) are arranged alternately along the flow direction of the mixed gas, and the first baffles (8) and the second baffles (9) divide the oil separation channel (6) into a serpentine airflow channel.

6. The oil separation device according to claim 1, characterized in that: An oil collecting groove (10) is provided on the inner wall of the oil separation channel (6), and the oil collecting groove (10) is configured to collect the lubricating oil separated by the labyrinth structure (7) to the bottom of the oil separation channel (6). A first channel (11) is also provided in the second end cover (4), and the first channel (11) is communicated with the oil collecting groove (10). The first channel (11) is configured to discharge the lubricating oil in the oil collecting groove (10) out of the oil separation channel (6).

7. The oil separation device according to claim 1, characterized in that: The oil separation channel (6) is arranged obliquely along the flow direction of the mixed gas, so that the lubricating oil separated by the labyrinth structure (7) can flow toward the end of the oil separation channel (6) under the action of gravity.

8. The oil separation device according to claim 1, characterized in that: The first end cover (3) is provided with an oil drain pipe (17), the oil drain pipe (17) connecting the first oil reservoir (12) and the second oil reservoir (13), and the oil drain pipe (17) is configured to transport lubricating oil exceeding a preset liquid level in the first oil reservoir (12) to the second oil reservoir (13).

9. A compressor, characterized in that: The invention comprises the oil separation device according to any one of claims 1 to 8.

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