CN112253465B

CN112253465B - Compressor oil return structure and compressor

Info

Publication number: CN112253465B
Application number: CN202011268255.8A
Authority: CN
Inventors: 樊灵
Original assignee: Sanden Huayu Automotive Air Conditioning Co Ltd
Current assignee: Sanden Huayu Automotive Air Conditioning Co Ltd
Priority date: 2020-11-13
Filing date: 2020-11-13
Publication date: 2023-05-26
Anticipated expiration: 2040-11-13
Also published as: CN112253465A

Abstract

The invention relates to the field of compressors, and discloses a compressor oil return structure and a compressor, wherein the compressor oil return structure comprises an introducing runner, a first runner and a first filter. According to the invention, one end of the introducing flow passage, which is communicated with the first flow passage, is arranged below the first flow passage, one end of the first filter extends into the first flow passage and is at least partially limited in the first flow passage, so that the introducing flow passage is separated from the exhaust cavity, the introducing flow passage has a steady flow effect, part of impurities are deposited at the bottom of the introducing flow passage in the flowing process, the pressure difference between the upper part and the lower part of the first filter is not obvious, the position of the first filter is higher, and the impurities blocked by the first filter can fall into the introducing flow passage below the first filter under the action of gravity, so that the blocking probability of the first filter is reduced.

Description

Compressor oil return structure and compressor

Technical Field

The invention relates to the field of compressors, in particular to a compressor oil return structure and a compressor.

Background

With the operation of the compressor, the refrigerant gas continuously flows to the exhaust cavity, lubricating oil is entrained in the refrigerant gas and brought into the exhaust cavity, and the lubricating oil is deposited at the bottom of the exhaust cavity due to the action of gravity, so that the working cavities where the movement mechanisms in the compressor are located are easy to be starved of oil. To return the lubricating oil to the working chamber, an oil return passage is typically provided in the compressor.

When impurities are present in the lubricating oil, there is a detrimental effect on the bearings running at high speed, resulting in wear of the bearing tracks and fracture of the cage. In order to improve the cleanliness of the return oil, a filter is usually arranged at the inlet of the return oil channel, and lubricating oil flows into the return oil channel after being filtered and enters the intermediate bearing cavity or the back pressure cavity.

However, the filter is located in the discharge chamber, which is the region of the compressor where the pressure is highest and the gas flow is greatest, and the pressure of the oil return passage is lower, so that there is a significant pressure difference across the filter. Impurities mixed in lubricating oil, such as metal abrasive dust rubbed by a motion mechanism, fallen coatings and the like, are easily collected on the surface of a rear cover filter screen under the action of air flow and pressure difference, so that the filter screen is blocked, oil return is affected, and oil shortage is caused on the back surfaces of an intermediate bearing and a movable disc. And when the pressure is severe, high-pressure air flow is prevented from flowing into the back pressure cavity, so that the pressure of the back pressure cavity is reduced, the dynamic and static discs are separated, and the normal operation of the compressor is influenced.

Disclosure of Invention

The invention aims to provide a compressor oil return structure and a compressor, which can solve the problem that a filter is blocked.

To achieve the purpose, the invention adopts the following technical scheme:

the oil return structure of the compressor comprises a shell, wherein an oil return channel is arranged in the shell and is used for communicating an exhaust cavity of the compressor so as to send lubricating oil at the bottom of the exhaust cavity to a part to be lubricated of the compressor; the oil return channel comprises an introducing flow channel and a first flow channel which are sequentially communicated along the flow direction of lubricating oil in the oil return channel, one end of the introducing flow channel, which is far away from the first flow channel, is used for being communicated with the exhaust cavity, and one end of the introducing flow channel, which is communicated with the first flow channel, is positioned below the first flow channel;

the compressor oil return structure further includes a first filter having one end extending into the first flow passage and at least partially defined therein.

As a preferable technical scheme of the compressor oil return structure, the shell comprises a first shell and a second shell which is connected with the first shell in a sealing way;

the first shell is provided with a first end face and a second end face which are oppositely arranged, the introducing flow passage penetrates through the first end face and the second end face, one end of the first flow passage penetrates through the first end face and is intersected with the introducing flow passage, and the intersection position of the first flow passage and the introducing flow passage is opposite to the end face of the second shell and is blocked by the second shell.

As a preferable technical scheme of the compressor oil return structure, the outer wall of the first filter is conical, and the large-diameter end of the first filter is limited outside the first flow passage and abuts against the end face of the second shell for blocking the intersecting position.

As a preferable technical scheme of the compressor oil return structure, a step surface is formed in the first runner and the interior of one end of the first runner, which is communicated with the introduction runner, one end of the first filter extends into the first runner and is abutted to the step surface, and the other end of the first filter is abutted to the end surface of the second shell, which is used for blocking the intersecting position.

As a preferable technical scheme of the compressor oil return structure, a step surface is formed in the interior of one end of the first flow passage, which is communicated with the introducing flow passage, and one end of the first filter extends into the first flow passage and is abutted against the step surface;

the oil return structure of the compressor further comprises a throttle pipe, the throttle pipe is positioned at the downstream of the filtering part of the first filter, the throttle pipe is connected with the mounting part of the first filter, and the throttle pipe is connected with the inner wall of the first flow passage in a sealing way.

As a preferable technical scheme of the compressor oil return structure, a sealing ring is clamped between the outer wall of the throttle pipe and the inner wall of the first flow passage.

As a preferable mode of the above compressor oil return structure, the oil return passage further includes a second flow passage communicating with and downstream of the first flow passage, and the second flow passage has a smaller aperture than the first flow passage to form an orifice.

As a preferable technical scheme of the compressor oil return structure, a second filter is installed at one end of the introducing flow passage, which is used for being communicated with the exhaust cavity, and the filtering precision of the second filter is lower than that of the first filter.

As a preferable technical scheme of the compressor oil return structure, the introducing flow passage is horizontally arranged.

The invention also provides a compressor comprising the compressor oil return structure.

The invention has the beneficial effects that: according to the invention, one end of the introducing flow passage, which is communicated with the first flow passage, is arranged below the first flow passage, one end of the first filter extends into the first flow passage and is at least partially limited in the first flow passage, so that the introducing flow passage is separated from the exhaust cavity, the introducing flow passage has a steady flow effect, part of impurities are deposited at the bottom of the introducing flow passage in the flowing process, the pressure difference between the upper part and the lower part of the first filter is not obvious, the position of the first filter is higher, and the impurities blocked by the first filter can fall into the introducing flow passage below the first filter under the action of gravity, so that the blocking probability of the first filter is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the description of the embodiments of the present invention, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the contents of the embodiments of the present invention and these drawings without inventive effort for those skilled in the art.

FIG. 1 is a cross-sectional view of a compressor according to an embodiment of the present invention;

FIG. 2 is a partial cross-sectional view of a compressor provided in accordance with an embodiment of the present invention;

FIG. 3 is a partial cross-sectional view of a compressor according to a second embodiment of the present invention;

FIG. 4 is a partial cross-sectional view of a compressor provided in accordance with a third embodiment of the present invention;

fig. 5 is a partial sectional view of a compressor according to a fourth embodiment of the present invention.

In the figure:

11. an electric motor; 12. a rotating shaft; 121. a crank pin; 13. an eccentric wheel; 14. a movable scroll; 15. a fixed scroll;

21. a first housing; 211. an exhaust hole; 212. a first end face; 213. a second end face; 22. a second housing; 23. a rear cover; 24. a back pressure chamber; 25. a low pressure chamber; 26. a high pressure chamber; 27. an exhaust chamber;

31. introducing a runner; 32. a first flow passage; 33. a second flow passage; 34. a throttle tube;

41. a first filter; 42. and a second filter.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the invention more clear, the technical scheme of the invention is further described below by a specific embodiment in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present invention are shown.

As shown in fig. 1 to 2, the present embodiment provides a compressor oil return structure and a compressor, wherein the compressor includes the compressor oil return structure, a fixed scroll 15, a movable scroll 14, a rotating shaft 12 and a rear cover 23, and the compressor oil return structure includes a housing, the housing includes a first housing 21 and a second housing 22 sealingly connected with the first housing 21, one end of the second housing 22 opposite to the first housing 21 is sealingly connected with the rear cover 23, and the movable scroll 14 and the fixed scroll 15 are disposed in a space enclosed by the rear cover 23 and the second housing 22.

One end of the rotating shaft 12 is connected with a rotor of the electric motor 11, the other end of the rotating shaft is rotatably connected with the first shell 21 through a first bearing, a crank pin 121 eccentrically arranged with the rotating shaft penetrates out of the first shell 21, an eccentric wheel 13 is fixedly sleeved outside the crank pin 121, and the eccentric wheel 13 is connected with the movable vortex plate 14. A back pressure cavity 24 is enclosed between the movable scroll 14 and the second shell 22, and the eccentric wheel 13 is positioned in the back pressure cavity 24.

The movable vortex disk 14 is eccentrically sleeved in the fixed vortex disk 15, the movable vortex disk 14 and the fixed vortex disk 15 are meshed to form a high-pressure cavity 26 and a low-pressure cavity 25 which are mutually communicated, an exhaust cavity 27 communicated with the high-pressure cavity 26 is formed by enclosing the end face, opposite to the movable vortex disk 14, of the fixed vortex disk 15, the rear cover 23 and the first shell 21, an exhaust hole 211 is formed in the center of the fixed vortex disk 15, an exhaust valve is arranged in the exhaust hole 211, and the high-pressure cavity 26 can be communicated with the exhaust cavity 27 through the exhaust hole 211.

The electric motor 11 works to enable the rotating shaft 12 to rotate, the rotating shaft 12 drives the eccentric wheel 13 to rotate, the movable vortex disk 14 rotates relative to the fixed vortex disk 15, gas in the low-pressure cavity 25 gradually enters the high-pressure cavity 26 along with the rotation of the movable vortex disk 14 and the fixed vortex disk 15, the volume of the high-pressure cavity 26 gradually decreases, the gas entering the high-pressure cavity 26 gradually changes into high-pressure gas, and the high-pressure gas in the high-pressure cavity 26 can open the exhaust valve to enter the exhaust cavity 27; at the same time, part of the lubricating oil enters the exhaust cavity 27 along with the high-pressure gas, and the lubricating oil in the exhaust cavity 27 is deposited at the bottom of the exhaust cavity 27 under the action of gravity. For the air conditioning system, the high-pressure gas in the present embodiment refers to a refrigerant.

Preferably, in order to facilitate the deposition of the lubricating oil in the high-pressure gas at the bottom of the exhaust chamber 27, an oil-gas separator is provided in the exhaust chamber 27. Specifically, the oil separator is mounted on the rear cover 23.

An oil return channel is arranged in the first shell 21 and is used for communicating with a discharge cavity 27 of the compressor so as to send lubricating oil at the bottom of the discharge cavity 27 to a part to be lubricated of the compressor; the oil return passage includes an introduction flow passage 31 and a first flow passage 32 which are sequentially communicated in the flow direction of the lubricating oil therein, one end of the introduction flow passage 31 away from the first flow passage 32 being for communication with the exhaust chamber 27, and one end of the introduction flow passage 31 communicating with the first flow passage 32 being located below the first flow passage 32; the compressor oil return structure further includes a first filter 41, and one end of the first filter 41 extends into the first flow passage 32 and is at least partially confined within the first flow passage 32.

In this embodiment, one end of the introducing flow channel 31, which is communicated with the first flow channel 32, is located below the first flow channel 32, and one end of the first filter 41 extends into the first flow channel 32 and is at least partially limited in the first flow channel 32, so that the introducing flow channel 31 is spaced between the first filter 41 and the exhaust cavity 27, the introducing flow channel 31 has a steady flow function, so that part of impurities are deposited at the bottom of the introducing flow channel 31 in the flowing process, the pressure difference between the upstream and downstream of the first filter 41 is not obvious, the position of the first filter 41 is higher, and impurities blocked by the first filter 41 can fall into the introducing flow channel 31 below the first filter 41 under the action of gravity, thereby reducing the probability of blocking the first filter 41.

Specifically, the first housing 21 has a first end face 212 and a second end face 213 which are disposed opposite to each other, the introduction flow passage 31 is horizontally provided in the lower portion of the second housing 22 and penetrates the first end face 212 and the second end face 213, one end of the introduction flow passage 31 communicates with the exhaust chamber 27, and the other end is blocked by the second housing 22. One end of the first flow passage 32 penetrates the first end face 212 and intersects the introduction flow passage 31, and the intersection position of the first flow passage 32 and the introduction flow passage 31 is opposite to the end face of the second housing 22 and the intersection position is blocked by the second housing 22, so that the first filter 41 is mounted.

In this embodiment, the outer wall of the first filter 41 is tapered, and the large diameter end of the first filter 41 is limited to the outside of the first flow channel 32 and abuts against the end surface of the second housing 22 at the sealing intersection position.

Specifically, the outer diameter of the large diameter end of the first filter 41 is larger than the maximum diameter of the first flow channel 32, so that the large diameter end of the first filter 41 is limited outside the first flow channel 32, and the end face of the second housing 22 at the blocking intersection position is used for limiting the first filter 41 to be separated from the first flow channel 32, thereby realizing the installation of the first filter 41. The small diameter end of the first filter 41 is pushed into the first flow channel 32 without adopting other mounting tools and positioning pieces, the second shell 22 and the first shell 21 are connected to tightly press the first filter 41, the mounting mode is simple, and the dismounting efficiency is high.

Further, the oil return passage further includes a second flow passage 33 that communicates with the first flow passage 32 and is located downstream of the first flow passage 32, the second flow passage 33 having a smaller aperture than the first flow passage 32 to form an orifice. The oil pressure of the lubricating oil flowing out of the second flow passage 33 is reduced by the orifice. In this embodiment, one end of the second flow channel 33 far away from the first flow channel 32 is communicated with the back pressure chamber 24, and in other embodiments, for a part of the compressor, the back pressure chamber 24 may not be provided, and the lubricating oil flowing out of the second flow channel 33 may be directly sent to the working chamber where the component to be lubricated is located, so as to lubricate the component to be lubricated.

Example two

This embodiment is further optimized on the basis of embodiment one. Specifically, as shown in fig. 3, a second filter 42 is installed at one end of the introduction flow passage 31 for communicating with the exhaust chamber 27, and the second filter 42 has a lower filtering accuracy than the first filter 41. The lubricating oil is preliminarily filtered by the second filter 42, and the second filter 42 is less likely to be clogged since the second filter 42 has a lower filtering accuracy than the first filter 41.

In this embodiment, the first filter 41 and the second filter 42 are both of a filter mesh structure. The mesh number of the first filter 41 is larger than that of the second filter 42, i.e., the mesh diameter of the first filter 41 is smaller than that of the second filter 42.

Example III

The first filter 41 in this embodiment is mounted in a manner different from that of the first embodiment. As shown in fig. 4, in the present embodiment, a barrel-shaped filter is selected as the first filter 41, a stepped surface is formed in the interior of one end of the first flow channel 32 communicating with the introduction flow channel 31, one end of the first filter 41 extends into the first flow channel 32 and abuts against the stepped surface, and the other end abuts against the end surface of the second housing 22 at the blocking intersection position.

Example IV

The first filter 41 in this embodiment is mounted in a manner different from that of the second embodiment. As shown in fig. 5, in the present embodiment, a barrel-shaped filter is selected as the first filter 41, a step surface is formed in the interior of the end of the first flow channel 32 communicating with the introduction flow channel 31, and one end of the first filter 41 extends into the first flow channel 32 and abuts against the step surface; the compressor oil return structure further includes a throttle pipe 34, the throttle pipe 34 is located downstream of the filtering portion of the first filter 41, the throttle pipe 34 is connected to the mounting portion of the first filter 41, and the throttle pipe 34 is hermetically connected to the inner wall of the first flow passage 32.

The throttle tube 34 is connected to the first filter 41, and the throttle tube 34 is hermetically connected to the inner wall of the first flow passage 32 to mount the first filter 41 in the first flow passage 32.

Preferably, a sealing ring is sandwiched between the inner wall of the first flow passage 32 and the outer wall of the throttle tube 34.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Claims

1. An oil return structure of a compressor comprises a shell, wherein an oil return channel is arranged in the shell and is used for being communicated with an exhaust cavity (27) of the compressor so as to send lubricating oil at the bottom of the exhaust cavity (27) to a part to be lubricated of the compressor; the oil return channel is characterized by comprising an introducing flow channel (31) and a first flow channel (32) which are communicated in sequence along the flow direction of lubricating oil in the oil return channel, wherein one end of the introducing flow channel (31) away from the first flow channel (32) is used for being communicated with the exhaust cavity (27), and one end of the introducing flow channel (31) communicated with the first flow channel (32) is positioned below the first flow channel (32);

the oil return passage further includes a second flow passage (33) communicating with the first flow passage (32) and located downstream of the first flow passage (32), the second flow passage (33) having a smaller pore diameter than the first flow passage (32) to form an orifice;

an end of the second flow passage (33) away from the first flow passage (32) communicates with a back pressure chamber (24);

the compressor oil return structure further comprises a first filter (41), wherein one end of the first filter (41) extends into the first flow passage (32) and is at least partially limited in the first flow passage (32);

the shell comprises a first shell (21) and a second shell (22) which is connected with the first shell in a sealing way;

the first shell (21) is provided with a first end face (212) and a second end face (213) which are oppositely arranged, the introducing flow channel (31) penetrates through the first end face (212) and the second end face (213), one end of the first flow channel (32) penetrates through the first end face (212) and is intersected with the introducing flow channel (31), and the intersecting position of the first flow channel (32) and the introducing flow channel (31) is opposite to the end face of the second shell (22) and is blocked by the second shell (22);

the outer wall of the first filter (41) is conical, and the large-diameter end of the first filter (41) is limited outside the first flow channel (32) and is abutted against the end face of the second shell (22) for blocking the intersecting position;

a step surface is formed in the first flow channel (32) and one end of the introduction flow channel (31) communicated with each other, one end of the first filter (41) extends into the first flow channel (32) and abuts against the step surface, and the other end abuts against the end surface of the second shell (22) at the intersection position.

2. The compressor oil return structure according to claim 1, wherein a stepped surface is formed inside an end of the first flow passage (32) communicating with the introduction flow passage (31), and an end of the first filter (41) extends into the first flow passage (32) and abuts against the stepped surface;

the oil return structure of the compressor further comprises a throttle pipe (34), wherein the throttle pipe (34) is positioned at the downstream of the filtering part of the first filter (41), the throttle pipe (34) is connected to the mounting part of the first filter (41), and the throttle pipe (34) is connected to the inner wall of the first flow passage (32) in a sealing way.

3. Compressor oil return structure according to claim 2, characterized in that a sealing ring is interposed between the outer wall of the throttle pipe (34) and the inner wall of the first flow channel (32).

4. A compressor oil return structure according to any one of claims 1 to 3, wherein a second filter (42) is mounted at one end of the introduction flow passage (31) for communicating with the exhaust chamber (27), and the second filter (42) has a lower filtration accuracy than the first filter (41).

5. A compressor oil return structure according to any one of claims 1 to 3, wherein the introduction flow passage (31) is horizontally disposed.

6. A compressor comprising the compressor oil return structure of any one of claims 1 to 5.