1. An oil separating device provided on a discharge side of a compressor, comprising: the oil separator comprises a compressor end cover, wherein a first oil separation structure (1) and a second oil separation structure (2) are arranged in the compressor end cover;

the first oil separating structure (1) and the second oil separating structure (2) are arranged in series along the exhaust flow direction of the compressor, and oil-gas mixed gas discharged by the compressor enters the first oil separating structure (1) for oil-gas separation and then enters the second oil separating structure (2) for oil-gas separation again.

2. The oil separation device of claim 1, wherein the compressor end cover comprises a first end cover (3), 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 axially outward of the first end cover (3), the first oil separation structure (1) being disposed on the first end cover (3), the second oil separation structure (2) being disposed on the second end cover (4).

3. The oil separation device according to claim 2, wherein 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.

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

5. The oil separation device according to claim 4, wherein the second oil separation structure (2) comprises an oil passage (6), a labyrinth structure (7) is arranged in the oil passage (6), and the labyrinth structure (7) enables mixed gas to complete oil-gas separation.

6. The oil separator according to claim 5, characterized in that the labyrinth (7) comprises at least two first baffles (8), at least two second baffles (9), the first and second baffles (8, 9) dividing the oil passage (6) into non-linear gas flow passages.

7. The oil separator according to claim 6, wherein the at least two first baffles (8) are provided at intervals in the flow direction of the mixed gas on one side of the inner wall of the oil passage (6), the at least two second baffles (9) are provided at intervals in the flow direction of the mixed gas on the opposite side of the inner wall of the oil passage (6), the first baffles (8) and the second baffles (9) are alternately arranged in the flow direction of the mixed gas, and the first baffles (8) and the second baffles (9) divide the oil passage (6) into serpentine gas flow passages.

8. The oil separating device according to claim 5, wherein an oil collection groove (10) is provided on an inner wall of the oil passage (6), the oil collection groove (10) is configured to collect the lubricating oil separated by the labyrinth structure (7) to a bottom of the oil passage (6), a first passage (11) is further provided in the second end cover (4), the first passage (11) communicates with the oil collection groove (10), and the first passage (11) is configured to discharge the lubricating oil in the oil collection groove (10) out of the oil passage (6).

9. The oil separation device according to claim 5, wherein the oil passage (6) is provided obliquely in the flow direction of the mixed gas so that the lubricating oil separated by the labyrinth (7) can flow toward the end of the oil passage (6) under the action of gravity.

10. The oil separator according to any one of claims 2 to 9, wherein a first oil reservoir (12) is further provided in the first end cover (3), the first oil reservoir (12) is in communication with an oil reservoir in the compressor, the first oil reservoir (12) is capable of storing lubricating oil separated by the first oil separator (1), a second oil reservoir (13) is further provided in the second end cover (4), the second oil reservoir (13) is in communication with the oil reservoir in the compressor, and the second oil reservoir (13) is capable of storing lubricating oil separated by the second oil separator (2).

11. -oil separation device according to claim 10, characterised in that the second end cover (4) comprises an end plate (14), the edge of which end plate (14) is provided with an axially projecting annular wall (15), the second end cover (4) being mounted axially on the outside of the first end cover (3), the end plate (14), the annular wall (15) and the first end cover (3) together enclosing the second oil reservoir (13), the annular wall (15) being further provided with a projection (16) projecting into the second oil reservoir (13), the oil passage (6) being provided on the projection (16) when an oil passage (6) is included.

12. The oil separating device according to claim 10, characterized in that the first oil reservoir (12) communicates with the second oil reservoir (13).

13. The oil separator according to claim 12, wherein an oil drain pipe (17) is provided on the first end cover (3), the oil drain pipe (17) communicating the first oil reservoir (12) and the second oil reservoir (13), the oil drain pipe (17) being configured to be able to convey lubricating oil in the first oil reservoir (12) that exceeds a preset level to the second oil reservoir (13).

14. A compressor, characterized by comprising an oil separating device according to any one of claims 1 to 13.

Background

At present, the electric scroll compressor is widely used in a new energy automobile air conditioning system. The compressor has a plurality of wearing parts in the operation process, if the wearing can not be effectively relieved, the efficiency of the compressor is greatly reduced, and the long-term reliability of the compressor is influenced under severe conditions. In the compressor, the lubricating oil liquid and the refrigerant gas are present in a mixed form and circulated in the system. In view of this, it is necessary for the respective components to separate the lubricating oil liquid from the refrigerant gas and to let the lubricating oil liquid flow back into the interior of the compressor to lubricate the respective friction pair, instead of being discharged out of the compressor with the gas. The common solution is to install an oil separation device on the exhaust side of the compressor, and the separation principle of the device is as follows: after the high-pressure gas-liquid mixed fluid is discharged from the compressor pump body, the gas-liquid mixed fluid spirally descends along the outer wall surface of the separator when passing through the cyclone separator along the exhaust port, lubricating oil liquid is thrown to the inner wall of the handpiece cover under the action of centrifugal force in the process, flows into the oil pool along the inner wall of the handpiece cover and flows back to the compressor along the oil return channel, and refrigerant gas flows upwards along the inside of the separator and is finally discharged out of the compressor.

However, such an oil separator cannot completely separate gas from liquid, and the oil content of refrigerant gas discharged from the compressor is high, so that the long-term reliability of the compressor is affected because the friction pair of the compressor cannot be lubricated.

Disclosure of Invention

Therefore, the technical problem that this disclosure will solve is that the gas-liquid separation of compressor is incomplete, influences the long-term reliability of compressor to provide an oil separator and compressor.

In order to solve the above problems, the present disclosure provides an oil separating apparatus provided at a discharge side of a compressor, including: the oil separator comprises a compressor end cover, wherein a first oil separation structure and a second oil separation structure are arranged in the compressor end cover;

the first oil separating structure and the second oil separating structure are arranged in series along the exhaust flow direction of the compressor, and oil-gas mixed gas discharged by the compressor enters the second oil separating structure for oil-gas separation again after entering the first oil separating structure for oil-gas separation.

The purpose of the present disclosure and the technical problems solved thereby can be further achieved by the following technical measures.

In some embodiments, the compressor end cover includes a first end cover coupled to the housing of the compressor, a second end cover coupled axially outward of the first end cover, the first oil separation structure disposed on the first end cover, and the second oil separation structure disposed on the second end cover.

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

In some embodiments, the first oil separation structure comprises a cyclone oil separator and the second oil separation structure comprises a labyrinth oil separator.

In some embodiments, the second oil separation structure comprises an oil passage, and a labyrinth structure is arranged in the oil passage and enables the mixed gas to complete oil-gas separation.

In some embodiments, the labyrinth structure includes at least two first baffles, at least two second baffles, the first and second baffles dividing the oil passage into non-linear gas flow passages.

In some embodiments, the at least two first baffles are disposed at intervals on one side of the inner wall of the oil passage in the flow direction of the mixed gas, the at least two second baffles are disposed at intervals on the opposite side of the inner wall of the oil passage in the flow direction of the mixed gas, the first baffles and the second baffles are alternately arranged in the flow direction of the mixed gas, and the first baffles and the second baffles divide the oil passage into serpentine-shaped gas flow passages.

In some embodiments, an oil collecting groove is formed on an inner wall of the oil passage, the oil collecting groove is configured to collect the lubricating oil separated by the labyrinth structure to a bottom of the oil passage, a first passage is further formed in the second end cover, the first passage is communicated with the oil collecting groove, and the first passage is configured to discharge the lubricating oil in the oil collecting groove out of the oil passage.

In some embodiments, the oil passage is disposed obliquely in a flow direction of the mixed gas such that the lubricating oil separated by the labyrinth structure can flow toward an end of the oil passage under gravity.

In some embodiments, a first oil reservoir is further disposed in the first end cover, the first oil reservoir being in communication with an oil reservoir in the compressor, and a second oil reservoir is further disposed in the second end cover, the second oil reservoir being in communication with an oil reservoir in the compressor.

In some embodiments, the second end cover comprises an end plate, an edge of the end plate is provided with an annular wall protruding in the axial direction, the second end cover is axially installed on the outer side of the first end cover, the end plate, the annular wall and the first end cover jointly enclose the second oil storage pool, the annular wall is further provided with a protruding portion protruding towards the inside of the second oil storage pool, and when the oil separation channel is included, the oil separation channel is arranged on the protruding portion.

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

In some embodiments, an oil dredging pipe is arranged on the first end cover, the oil dredging pipe is communicated with the first oil storage pool and the second oil storage pool, and the oil dredging pipe is configured to convey lubricating oil in the first oil storage pool, which exceeds a preset liquid level, to the second oil storage pool.

A compressor comprises the oil separation device.

The oil separation device and the compressor provided by the disclosure have the following beneficial effects:

the oil separating device disclosed by the invention has the advantages that the problems of incomplete gas-liquid separation and high oil content of refrigerant gas of the scroll compressor are solved, a two-stage oil separating mode is adopted, a two-stage oil separating structure is arranged in an end cover of the compressor, the first oil separating structure and the second oil separating structure are connected with an exhaust port of the compressor in series, and the refrigerant gas discharged by the compressor is subjected to oil-gas separation twice, so that the gas-liquid separation effect is improved, the oil content of the refrigerant gas discharged by the compressor is reduced, and the long-term reliability of the compressor is prevented from being influenced due to the fact that a friction pair of the compressor cannot.

Drawings

Fig. 1 is a schematic structural view of a compressor according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural view of a first end cap according to an embodiment of the disclosure;

FIG. 3 is a schematic structural view of a second end cap according to an embodiment of the disclosure;

FIG. 4 is a first schematic structural diagram of a labyrinth oil separator according to an embodiment of the present disclosure;

FIG. 5 is a first schematic structural diagram of a labyrinth oil separator according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a labyrinth oil separator according to another embodiment of the present disclosure;

FIG. 7 is a schematic structural view of a second endcap of another embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of a second channel and a third channel according to another embodiment of the disclosure.

The reference numerals are represented as:

1. a first oil separating structure; 2. a second oil separating structure; 3. a first end cap; 4. a second end cap; 5. a housing; 6. an oil passage; 7. a labyrinth structure; 8. a first baffle plate; 9. a second baffle; 10. an oil collection groove; 11. a first channel; 12. a first oil reservoir; 13. a second oil reservoir; 14. an end plate; 15. an annular wall; 16. a protrusion; 17. an oil dredging pipe; 18. a first exhaust port; 19. an exhaust port of the cyclone separator; 20. a sealing plug; 21. an oil outlet; 22. a second exhaust port; 23. a semicircular labyrinth oil separator; 23. a second channel; 24. a third channel.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, the following embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings. It is to be understood that the described embodiments are merely a subset of the disclosed embodiments and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

Referring to fig. 1 to 8, an embodiment of the present disclosure provides an oil separating apparatus disposed on a discharge side of a compressor, including: the compressor is characterized in that a pump body of the compressor consists of a fixed scroll and a movable scroll, and the refrigerant flows out along a pump body exhaust port after being compressed by the compressor and then enters the compressor end cover through a first exhaust port 18. A first oil separation structure 1 and a second oil separation structure 2 are arranged in the compressor end cover; the first oil separating structure 1 and the second oil separating structure 2 are arranged in series along the exhaust flow direction of the compressor, and the oil-gas mixed gas discharged by the compressor enters the first oil separating structure 1 for oil-gas separation and then enters the second oil separating structure 2 for oil-gas separation again.

The oil separation device disclosed by the embodiment of the disclosure aims at the problems of incomplete gas-liquid separation and high oil content of refrigerant gas of a scroll compressor in the prior art, adopts a two-stage oil separation mode, and is provided with a two-stage oil separation structure in an end cover of the compressor, wherein the first oil separation structure 1 and the second oil separation structure 2 are connected in series with an exhaust port of the compressor, so that the refrigerant gas discharged by the compressor is subjected to oil-gas separation twice, the oil-gas separation efficiency in the compressor is improved, the oil content of the refrigerant gas discharged by the compressor is reduced, the lubricating condition of a friction pair in the compressor is improved, and the long-term reliability of the operation of the compressor.

In some embodiments, the compressor end cover comprises a first end cover 3 and a second end cover 4, the first end cover 3 is connected to a shell 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 adopting a screw connection mode, and sealing is realized by adopting a sealing gasket mode.

The compressor end cover in this embodiment is divided into two parts, wherein set up first oil separating structure 1 in the first end cover 3, set up second oil separating structure 2 in the second end cover 4, can simplify the structural complexity of single end cover, and split type processing avoids appearing that the processing technology is excessively complicated, leads to the too high problem of processing cost.

In some embodiments, the first oil separation structure 1 comprises at least one of a cyclone oil separator and a labyrinth oil separator, and the second oil separation structure 2 comprises 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.

In this embodiment, after the mixed gas is discharged from the first exhaust port 18, the mixed gas is actually in an oil-gas mixed state under high pressure, and the high-speed fluid discharged from the first exhaust port 18 makes a downward spiral motion around the outer wall surface of the cyclone oil separator when striking the outer wall surface, and the direction is downward, so that the lubricating oil can be separated from the mixed gas under the action of centrifugal force, and is thrown onto the inner wall surface of the first end cover 3, and then flows to the bottom along the inner wall surface under the action of gravity, and the gas can flow upward from the channel in the middle of the cyclone oil separator to the exhaust port 19 of the cyclone oil separator. However, the oil is not separated 100%, and a part of the oil is also entrained in the gas flowing out. The refrigerant gas separated at this time flows through the cyclone discharge port 19 and the second discharge port 22 into the second head cover 4 to be further separated. The lubricating oil separated by the cyclone oil separator flows to the first oil reservoir 12 at the bottom of the first end cover 3 under the action of gravity, and then returns to the compressor along the second channel to continuously lubricate the friction pair of the compressor.

Meanwhile, in order to isolate the refrigerant from the outside, a sealing plug 20 is placed in a radial outlet of the first end cover 3 to seal the first separation structure, so that the refrigerant mixed gas completely enters the second separation structure in the second end cover 4 to carry out secondary oil-gas separation.

In some embodiments, the second oil separation structure 2 includes an oil passage 6, and a labyrinth structure 7 is arranged in the oil passage 6, and the labyrinth structure 7 enables the mixed gas to complete oil-gas separation.

In the embodiment, the second oil separation structure 2 adopts a labyrinth oil separator, and the labyrinth structure 7 is arranged in the oil separation channel 6 to separate the refrigerant mixed gas lubricating oil, so that secondary oil-gas separation can be realized, and meanwhile, the exhaust pressure of the compressor is prevented from causing large pressure drop, and the exhaust pressure at the outlet of the labyrinth oil separator is 1.89MPa and the pressure drop loss is small when the exhaust pressure at the second exhaust port 22 is 1.9 MPa.

In some embodiments, the labyrinth structure 7 includes at least two first baffles 8 and at least two second baffles 9, and the first and second baffles 8 and 9 divide the oil passage 6 into nonlinear gas flow passages.

Preferably, the at least two first baffles 8 are arranged at intervals on one side of the inner wall of the oil passage 6 in the flow direction of the mixed gas, the at least two second baffles 9 are arranged at intervals on the opposite side of the inner wall of the oil passage 6 in the flow direction of the mixed gas, the first baffles 8 and the second baffles 9 are arranged alternately in the flow direction of the mixed gas, and the first baffles 8 and the second baffles 9 divide the oil passage 6 into serpentine gas flow passages.

Among the labyrinth oil separator, set up two rows of baffles in the direction of oil-gas mixture fluid vertical flow, they are intersected and do not cut in, and the quantity of baffle can be taken according to the design demand, according to the knowledge in the aspect of hydrodynamics, when gas flows to less cavity from great cavity, its velocity of flow can be because the sectional area through the cavity reduces and increase, and the velocity of flow is faster when striking the baffle for the mixed fluid, and oil drips are separated more easily. By this principle, when the mixed fluid flows through the labyrinth separator, hitting each baffle in the flow direction, the droplets will separate and fall under the influence of gravity tangentially along the baffle into the bottom of the oil passage 6. This process is repeated until the gas flows out of the right side of the oil passage 6, and then is discharged out of the compressor.

In some embodiments, an oil collection groove 10 is provided on an inner wall of the oil passage 6 at the bottom in the vertical direction, the oil collection groove 10 is configured to collect the lubricating oil separated by the labyrinth structure 7 to the bottom of the oil passage 6, a first passage 11 is further provided in the second end cover 4, the first passage 11 is communicated with the oil collection groove 10, and the first passage 11 is configured to discharge the lubricating oil in the oil collection groove 10 out of the oil passage 6 to the second oil reservoir 13 or directly return the lubricating oil to the inside of the compressor.

In this embodiment, the oil separated by the labyrinth oil separator flows toward the bottom of the oil passage 6 under the action of gravity, an oil collecting groove 10 is provided on the inner wall of the bottom of the oil passage 6, the oil collecting groove 10 collects and temporarily accommodates all the oil dropped from the baffle, and conveys the oil to the first passage 11, and the oil is conveyed to the second oil storage tank 13 by the first passage 11, or is directly conveyed back to the inside of the compressor.

In some embodiments, the oil passage 6 is disposed obliquely in the flow direction of the mixed gas, so that the lubricating oil separated by the labyrinth 7 can flow toward the end of the oil passage 6 under the action of gravity. Alternatively, the oil passage 6 may be inclined upward gradually in the air flow direction, or inclined downward gradually in the air flow direction, so that the lubricating oil may be collected to the end of the oil passage 6.

Preferably, oil branch passageway 6 adopts the scheme of gradual tilt up, and the flow direction of lubricating oil is opposite with the air current flow direction, prevents that fluid from being carried by the air current once more, simultaneously, can also directly set up first passageway 11 on the terminal surface of second end cover 4, reduces the processing degree of difficulty.

Preferably, the inclination angle of the oil channel 6 ranges from 1 to 2 degrees, so as to facilitate processing and assembly.

In some embodiments, a first oil reservoir 12 is further disposed in the first end cap 3, the first oil reservoir 12 is communicated with an oil reservoir in the compressor, and a second oil reservoir 13 is further disposed in the second end cap 4, the second oil reservoir 13 is communicated with the oil reservoir in the compressor through a third passage. Preferably, the third channel penetrates the second end cover 4 and the first end cover 3 in sequence and then enters the interior of the compressor.

In some embodiments, the second end cover 4 comprises an end plate 14, an edge of the end plate 14 is provided with an annular wall 15 protruding in the axial direction, the second end cover 4 is mounted axially outside 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 towards the inside of the second oil reservoir 13, and when the oil passage 6 is included, the oil passage 6 is arranged on the protrusion 16.

Further, consider the rationality of processing, labyrinth structure 7 still includes the cylinder, and the cylinder forms for two semicylindrical concatenations, and first baffle 8, second baffle 9 set up respectively in the inside of a semicylindrical section of thick bamboo, then merge together and constitute cylindrically, in the oil content passageway 6 of the second end cover 4 of common interference impressed. The oil collecting groove 10 is arranged on the inner wall of the cylindrical part, an oil outlet 21 is formed in the cylindrical part, and the oil outlet 21 is communicated with the first channel 11.

In some embodiments, the labyrinth separator may take the shape of a cylinder, a semi-cylinder, a rectangle, etc., and the shape of the corresponding oil passage 6 also takes the shape of a cylinder, a semi-cylinder, or a rectangle. Fig. 7 shows a structure of the second end cover 4 having the semicircular labyrinth oil separator 23.

In the related art, when the accumulated oil level in the first oil storage tank 12 rises and then submerges the inlet at the bottom of the cyclone separator, the separation effect of the cyclone separator is greatly reduced or even fails, so that the friction pair of the compressor cannot be lubricated, and the long-term reliability of the compressor is affected.

Thus, in some embodiments, the first oil reservoir 12 is in communication with the second oil reservoir 13. Preferably, an oil drain pipe 17 is arranged on the first end cover 3, the oil drain pipe 17 communicates the first oil storage pool 12 with the second oil storage pool 13, and the oil drain pipe 17 is configured to be capable of conveying lubricating oil in the first oil storage pool 12, which exceeds a preset liquid level, to the second oil storage pool 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 flows into the second oil reservoir 13 in the second end cover 4 along the oil drain pipe 17, and flows back into the compressor together with the oil separated by the labyrinth separator.

In some embodiments, the second channel 23 and the third channel 24 are set to have a certain slope, that is, the horizontal height gradually decreases from the first oil storage pool 12 or the second oil storage pool 13 to the oil pool inside the compressor, so as to ensure smooth flow of the lubricating oil liquid and improve the backflow efficiency of the lubricating oil in the oil storage pool. Optionally, the third channel 24 and the second channel 23 converge to return the lubricating oil to the compressor, as shown in fig. 1, or the third channel 24 and the second channel 23 may be arranged in parallel to return the lubricating oil to the inside of the compressor, as shown in fig. 8. The scheme of the compressor can reduce the opening of the internal channel of the compressor and simplify the processing technology of the compressor.

The embodiment of the disclosure also provides a compressor, which comprises the oil separation device.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present disclosure is to be considered as limited only by the preferred embodiments and not limited to the specific embodiments described herein, and all changes, equivalents and modifications that come within the spirit and scope of the disclosure are desired to be protected. The foregoing is only a preferred embodiment of the present disclosure, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present disclosure, and these improvements and modifications should also be considered as the protection scope of the present disclosure.