CN114857009B - Oil-gas separation structure and compressor - Google Patents
Oil-gas separation structure and compressor Download PDFInfo
- Publication number
- CN114857009B CN114857009B CN202210631214.3A CN202210631214A CN114857009B CN 114857009 B CN114857009 B CN 114857009B CN 202210631214 A CN202210631214 A CN 202210631214A CN 114857009 B CN114857009 B CN 114857009B
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- oil
- collecting seat
- oil collecting
- gas separation
- baffle
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- 238000000926 separation method Methods 0.000 title claims abstract description 43
- 239000000203 mixture Substances 0.000 claims abstract description 24
- 230000000903 blocking effect Effects 0.000 claims description 29
- 230000007547 defect Effects 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 156
- 230000009471 action Effects 0.000 description 11
- 239000010687 lubricating oil Substances 0.000 description 8
- 238000009966 trimming Methods 0.000 description 7
- 239000003507 refrigerant Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000005484 gravity Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000003584 silencer Effects 0.000 description 3
- 239000010725 compressor oil Substances 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
- F04C29/026—Lubricant separation
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The invention provides an oil-gas separation structure and a compressor, wherein the oil-gas separation structure comprises: the oil collecting seat and the oil baffle are arranged on the end face of the rotor, the rotor can drive the oil collecting seat and the oil baffle to rotate, the oil collecting seat is sleeved outside the oil baffle, a gap exists between the oil collecting seat and the oil baffle, moreover, the gap can flow an oil-gas mixture, the oil-gas mixture can be blocked for separating oil from the inner side wall of the oil collecting seat, gas after the oil-gas mixture is separated can flow and move upwards through the gap, and a plurality of oil drain holes are formed in the oil collecting seat. The defect of higher oil circulation rate of the compressor in the prior art can be overcome.
Description
Technical Field
The invention relates to the technical field of compressor oil separation, in particular to an oil separation structure and a compressor.
Background
With the continuous improvement of energy efficiency and the demand of cost reduction, the rolling rotor compressor for the refrigeration air conditioner is developed towards miniaturization and high speed. In the development process of miniaturization and high speed, the internal fluid space of the compressor is smaller and smaller, the oil circulation rate is an important factor influencing the performance of the compressor, the problem of how to reduce the oil discharge rate of the compressor after miniaturization and high speed is a serious difficulty in developing compressor products, and the internal oil gas flow mechanism of the compressor is complex and has no corresponding theoretical analysis method.
The conventional rotor compressor is characterized in that an oil-gas mixture discharged from an outlet of an upper silencer enters a rotor flow hole, airflow is discharged from the top of the rotor flow hole, is guided by an oil baffle plate and flows out radially along the lower end face of the oil baffle plate under the action of centrifugal force, oil drops flow radially under the action of centrifugal force and gravity in the process, the airflow ascends along the outer diameter wall surface of the oil baffle plate and generates a flow separation area, a part of the airflow flows to an exhaust pipe under the action of pressure, a part of the airflow flows back to the wall surface of a shell and a coil gap, and simultaneously lubricating oil drops separated by the centrifugal force are reduced to flow back to an oil pool at the bottom of the compressor through a coil gap and a stator trimming. The existing compressor oil-retaining structure can only reduce the compressor oil circulation rate by a small margin, and still has the problem of incomplete oil-gas separation.
Disclosure of Invention
Therefore, the invention provides an oil-gas separation structure and a compressor, which can overcome the defect of higher oil circulation rate of the compressor in the prior art.
In order to solve the above problems, the present invention provides an oil-gas separation structure comprising: the oil collecting seat and the oil baffle are arranged on the end face of the rotor, the rotor can drive the oil collecting seat and the oil baffle to rotate, the oil collecting seat is sleeved outside the oil baffle, a gap exists between the oil collecting seat and the oil baffle, moreover, the gap can flow an oil-gas mixture, the oil-gas mixture can be blocked for separating oil from the inner side wall of the oil collecting seat, gas after the oil-gas mixture is separated can flow and move upwards through the gap, and a plurality of oil drain holes are formed in the oil collecting seat.
In some embodiments, the oil collecting seat is cylindrical, a cover plate is arranged on the end face, far away from the rotor, of the oil collecting seat, and the cover plate, the oil collecting seat and the end face of the rotor enclose a cavity structure.
In some embodiments, the cover plate is provided with an air outlet, and the air guide gas in the gap can be discharged from the air outlet.
In some embodiments, the gap includes a horizontal channel between a lower bottom of the oil baffle and an upper bottom of the oil collection seat, and a vertical channel between an outer sidewall of the oil baffle and an inner sidewall of the oil collection seat.
In some embodiments, the oil collecting device further comprises a balance block, wherein the balance block is fixedly connected with any one of the oil baffle plate, the rotor and the oil collecting seat, and the balance block is positioned in the horizontal channel.
In some embodiments, a portion of the inner side wall of the oil collecting seat opposite to the horizontal channel is a first blocking portion, and a portion of the cover plate opposite to the vertical channel is a second blocking portion.
In some embodiments, the oil drain holes are uniformly formed on the side wall of the oil collecting seat along the circumferential direction of the oil collecting seat, and the oil drain holes are located between the first blocking portion and the second blocking portion.
In some embodiments, the height of the oil collecting seat is H2, and the height of the oil baffle plate is H1, wherein H2-H1 is more than or equal to 5mm.
In some embodiments, a flow guide member is disposed on an outer sidewall of the oil baffle plate along an axial direction of the oil collecting seat.
In some embodiments, the plurality of the flow guiding elements are distributed at intervals along the circumference of the oil baffle.
In some embodiments, the oil collecting seat comprises a circular ring plate-shaped main body structure and a blocking structure which is connected to the periphery of the main body structure and extends upwards, wherein the diameter of the upper end surface of the blocking structure is smaller than that of the lower end surface of the blocking structure.
The invention also provides a compressor comprising the oil-gas separation structure.
The invention also provides an oil-gas separation structure and a compressor, when an oil-gas mixture enters a gap between the oil collecting seat and the oil baffle, the rotor drives the oil collecting seat and the oil baffle to rotate, lubricating oil drops in the oil-gas mixture gather under the blocking action of centrifugal force and the inner side wall of the oil collecting seat, separated gas is guided by the gap to move upwards, separated oil gathers on the outer wall of the oil baffle and the lower end of the oil collecting seat, and is condensed on the wall surfaces of the oil baffle and the oil collecting seat, and the lubricating oil drops gathered on the lower part of the oil collecting seat are discharged through an oil discharge hole on the oil collecting seat under the action of the rotating centrifugal force of the rotor. The defect of higher oil circulation rate of the compressor in the prior art can be overcome.
Drawings
FIG. 1 is a longitudinal cross-sectional structural view of an oil-gas separation structure according to an embodiment of the present invention;
FIG. 2 is a cross-sectional block diagram of an oil and gas separation structure according to an embodiment of the present invention;
FIG. 3 is a partial enlarged view of an oil-gas separation structure according to an embodiment of the present invention;
FIG. 4 is a second enlarged view of a portion of an oil-gas separation structure according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a cover plate in an oil-gas separation structure according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a structure of an oil collecting seat in an oil-gas separation structure according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an oil baffle plate in an oil-gas separation structure according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of an oil baffle plate in an oil-gas separation structure according to another embodiment of the present invention.
The reference numerals are expressed as:
1. an upper muffler exhaust outlet; 2. a rotor flow hole; 3. coil gap; 4. stator trimming flow holes; 5. an oil baffle plate; 6. a balance weight; 7. an exhaust pipe; 8. an oil collecting seat; 9. a cover plate; 10. an air outlet; 11. and an oil drain hole.
Detailed Description
Referring now to FIGS. 1 through 6 in combination, in accordance with an embodiment of the present invention, there is provided an oil-gas separation structure including: the rotor, be provided with oil collecting seat 8 and oil baffle 5 on the terminal surface of rotor, the rotor can drive oil collecting seat 8 with oil baffle 5 is rotatory, oil collecting seat 8 cover is established in oil baffle 5 outsidely, just, oil collecting seat 8 with there is the clearance between the oil baffle 5, just, the oil gas mixture can flow in the clearance, oil gas mixture can be in oil collecting seat 8's inside wall is blocked the oil separation, the gas after the oil gas mixture separation can receive the clearance water conservancy diversion, make its upward movement, be provided with a plurality of oil drain holes 11 on the oil collecting seat 8.
In this technical scheme, after the exhaust gas mixture of upper silencer exhaust outlet 1 gets into motor rotor flow hole 2 back and goes up to the clearance between oil collection seat 8 and the oil baffle 5, the rotor drives oil collection seat 8 and oil baffle 5 rotate, the lubricating oil drop in the oil gas mixture is under centrifugal force the inside wall of oil collection seat 8 blocks the effect and gathers, and the gas after the separation passes through the clearance water conservancy diversion, upward movement, and the oil after the separation gathers at oil baffle 5 outer wall and oil collection seat 8 lower extreme to agglomerate at oil baffle 5 and oil collection seat 8 wall, the lubricating oil drop of gathering in oil collection seat 8 lower part is discharged through oil collection seat 8 upper drain hole 11 under the rotatory centrifugal force effect of rotor. The discharged oil flows to the motor coil gap 3 and the stator trimming flow hole 4, and returns to the lower oil pool along the coil gap 3 and the stator trimming flow hole 3 under the action of the reflux air flow of the upper cavity and the gravity. The defect of higher oil circulation rate of the compressor in the prior art can be overcome.
In a specific embodiment, the oil collecting seat 8 is cylindrical, a cover plate 9 is disposed on an end surface of the oil collecting seat 8 away from the rotor, and the cover plate 9, the oil collecting seat 8 and the end surface of the rotor enclose a cavity structure. Specifically, an air outlet 10 is provided on the cover plate 9, and the air guided in the gap can be discharged from the air outlet 10. In the technical scheme, the separated gas continuously ascends to the upper part of the oil baffle plate 5 in the cavity along the outer diameter of the oil baffle plate 5, and the refrigerant gas is discharged to a compressor exhaust pipe from the gas outlet 10.
In a specific embodiment, the gap includes a horizontal channel between the lower bottom of the oil baffle 5 and the upper bottom of the oil collection seat 8, and a vertical channel between the outer sidewall of the oil baffle 5 and the inner sidewall of the oil collection seat 8. In the technical scheme, the gap is divided into a horizontal channel and a vertical channel, the horizontal channel is mainly used for separating oil and discharging oil, and the vertical channel is mainly used for guiding gas.
In a specific embodiment, the oil collecting device further comprises a balance weight 6, wherein the balance weight 6 is fixedly connected with any one of the oil baffle 5, the rotor and the oil collecting seat 8, and the balance weight 6 is positioned in the horizontal channel. In the technical scheme, the oil-gas separation efficiency is improved by utilizing the rotation disturbance of the balance weight 6. The air flow is guided by the oil baffle plate 5 and flows down under the rotation disturbance of the balance weight 6, and lubricating oil drops in the oil-gas mixture are gathered at the lower ends of the oil baffle plate 5 and the oil collecting seat 8 under the action of centrifugal force and disturbance force, so that the oil circulation rate of the compressor is further reduced, and the reliability and performance of the compressor are improved.
In a specific embodiment, the portion of the inner side wall of the oil collecting seat 8 opposite to the horizontal channel is a first blocking portion, and the portion of the cover plate 9 opposite to the vertical channel is a second blocking portion. Specifically, along the circumference of the oil collecting seat 8, the oil drain holes 11 are uniformly formed on the side wall of the oil collecting seat 8, and the oil drain holes 11 are located between the first blocking portion and the second blocking portion, preferably, the oil drain holes 11 are located near the first blocking portion, and the oil drain holes 11 are located above the first blocking portion. In this technical scheme, through first blocking part and second blocking part two place barrier for the oil energy rate of separation in the oil gas mixture is higher, and the position setting of oil drain hole 11 is in between first blocking part and the second blocking part, and be located being close to first blocking part department, when this position discharges oil, oil can flow to motor coil gap 3 and stator side cut circulation hole 4 fast, has improved oil return efficiency.
In a specific embodiment, the height of the oil collecting seat 8 is H2, and the height of the oil baffle 5 is H1, wherein H2-H1 is more than or equal to 5mm. In this technical scheme, this difference in height can lead to the exhaust resistance too big, and the exhaust is unsmooth, and oil-gas separation effect is not good. 5mm is the most preferred choice for this solution. Meanwhile, in order to avoid increasing exhaust loss and improve the oil-gas separation effect, the area S2 of the air outlet 10 is larger than the total flow area S1 of all the exhaust ports of the compressor, S1 is the sum of the areas of all the exhaust ports of the compressor, and taking a double-cylinder double-exhaust compressor as an example, the sum of the areas of the exhaust ports of the upper flange and the lower flange is S1.
In a specific embodiment, the oil collecting seat 8 includes a circular plate-shaped main body structure, and a blocking structure connected to the outer periphery of the main body structure and extending upward, where the diameter of the upper end surface of the blocking structure is smaller than that of the lower end surface of the blocking structure. The inner side wall of the oil collecting seat 8 is in a round table shape. In the technical scheme, the oil-gas mixture discharged from the exhaust outlet 1 of the upper silencer enters the lower cavity of the motor, a certain low-pressure area is formed at the lower part of the oil baffle 5 due to the rotation action of the rotor and the oil baffle 5 at the upper part of the rotor, the oil-gas mixture in the lower cavity enters the flow space formed by the oil collection seat 8, the oil baffle 5 and the cover plate 6 after entering the flow hole of the motor rotor under the action of pressure difference, the air flow is guided by the oil baffle 5 and simultaneously flows down under the rotation disturbance of the balance block 6, lubricating oil drops in the oil-gas mixture are gathered at the lower ends of the oil baffle 5 and the oil collection seat 8 under the action of centrifugal force and turbulent force, the inner side wall of the oil collection seat 8) is in a circular table shape, the oil-gas mixture can collide with the inner side wall of the oil collection seat 8) in the rising process, the oil separation effect is achieved, the oil baffle 5 and the wall surface of the oil collecting seat 8 are condensed, refrigerant gas is separated and continuously ascends to a cavity formed by the oil baffle 5 and the cover plate 9 along the outer diameter of the oil baffle 5, the refrigerant gas is discharged to an upper cavity of the motor and a compressor exhaust pipe from an air outlet 10, most of the refrigerant gas enters the compressor exhaust pipe and then enters the system for circulating heat exchange, a small part of the refrigerant gas continuously moves upwards along the outside of the exhaust pipe, a symmetrical vortex field is formed in the upper cavity of the motor, after the refrigerant gas encounters the upper cover and the wall surface of the shell, the air flow is decelerated and changed in direction, and the part of the air flow flows to the lower cavity of the motor along the wall surface of the shell, the stator trimming flow holes 4 and the coil gap 3 flow holes. The lubricating oil drops collected at the lower part of the oil collecting seat 8 are discharged to the motor coil gap 3 and the stator trimming flow hole 4 through the oil discharge hole 11 on the oil collecting seat 8 under the action of the rotating centrifugal force of the rotor, the oil drops are separated to return to the lower oil pool along the coil gap 3 and the stator trimming flow hole 4 under the action of the reflux air flow of the upper cavity and the gravity, and thus the oil-gas separation inside the compressor is realized.
In a specific embodiment, a flow guiding member is disposed on the outer sidewall of the oil baffle plate 5) along the axial direction of the oil collecting seat 8. Specifically, the number of the flow guiding members is plural, and the plurality of the flow guiding members are distributed at intervals along the circumferential direction of the oil baffle plate 5). In the technical scheme, the flow guide piece can more effectively separate oil drops in the oil-gas mixture, so that the oil drops can be thrown onto the inner surface of the oil collecting seat 8 to a greater extent, the oil-gas separation efficiency is improved, and the oil circulation rate is reduced.
The invention also provides a compressor comprising the oil-gas separation structure.
Those skilled in the art will readily appreciate that the advantageous features of the various aspects described above may be freely combined and stacked without conflict.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (10)
1. An oil-gas separation structure, characterized in that: comprising the following steps: the oil collecting device comprises a rotor, wherein an oil collecting seat (8) and an oil baffle (5) are arranged on the end face of the rotor, the rotor can drive the oil collecting seat (8) and the oil baffle (5) to rotate, the oil collecting seat (8) is sleeved outside the oil baffle (5), a gap exists between the oil collecting seat (8) and the oil baffle (5), an oil-gas mixture can flow in the gap, the oil-gas mixture can be blocked and separated on the inner side wall of the oil collecting seat (8), and gas separated from the oil-gas mixture can be guided by the gap and can move upwards, and a plurality of oil drain holes (11) are formed in the side wall of the oil collecting seat (8); the end face, far away from the rotor, of the oil collecting seat (8) is provided with a cover plate (9), the gap comprises a horizontal channel and a vertical channel, the horizontal channel is located between the lower bottom of the oil baffle (5) and the upper bottom of the oil collecting seat (8), the vertical channel is located between the outer side wall of the oil baffle (5) and the inner side wall of the oil collecting seat (8), the part, opposite to the horizontal channel, of the inner side wall of the oil collecting seat (8) is a first blocking part, and the part, opposite to the vertical channel, of the cover plate (9) is a second blocking part; the oil drain hole (11) is located between the first blocking portion and the second blocking portion.
2. The oil-gas separation structure according to claim 1, wherein: the oil collecting seat (8) is cylindrical, and the cover plate (9), the oil collecting seat (8) and the end face of the rotor enclose a cavity structure.
3. The oil-gas separation structure according to claim 2, characterized in that: an air outlet (10) is formed in the cover plate (9), and the air guide gas in the gap can be discharged from the air outlet (10).
4. The oil-gas separation structure according to claim 1, wherein: the oil collecting device further comprises a balance block (6), wherein the balance block (6) is fixedly connected with any one of the oil baffle (5), the rotor and the oil collecting seat (8), and the balance block (6) is located in the horizontal channel.
5. The oil-gas separation structure according to claim 1, wherein: along the circumference of the oil collecting seat (8), the oil drain holes (11) are uniformly arranged on the side wall of the oil collecting seat (8).
6. The oil-gas separation structure according to claim 1, wherein: the height of the oil collecting seat (8) is H2, and the height of the oil baffle (5) is H1, wherein H2-H1 is more than or equal to 5mm.
7. The oil-gas separation structure according to claim 1, wherein: the oil collecting seat (8) comprises a circular ring plate-shaped main body structure and a blocking structure which is connected with the periphery of the main body structure and extends upwards, and the inner diameter of the upper end face of the blocking structure is smaller than that of the lower end face of the blocking structure.
8. The oil-gas separation structure according to claim 1, wherein: and a flow guide piece is arranged on the outer side wall of the oil baffle plate (5) along the axial direction of the oil collecting seat (8).
9. The oil and gas separation structure of claim 8, wherein: the plurality of the flow guide pieces are distributed at intervals along the circumference of the oil baffle plate (5).
10. A compressor, characterized in that: comprising the oil-gas separation structure of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210631214.3A CN114857009B (en) | 2022-06-06 | 2022-06-06 | Oil-gas separation structure and compressor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210631214.3A CN114857009B (en) | 2022-06-06 | 2022-06-06 | Oil-gas separation structure and compressor |
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| Publication Number | Publication Date |
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| CN114857009A CN114857009A (en) | 2022-08-05 |
| CN114857009B true CN114857009B (en) | 2023-06-30 |
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| CN202210631214.3A Active CN114857009B (en) | 2022-06-06 | 2022-06-06 | Oil-gas separation structure and compressor |
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| CN115492769A (en) * | 2022-10-18 | 2022-12-20 | 珠海格力电器股份有限公司 | Scroll compressor and air conditioner comprising same |
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| WO2018130134A1 (en) * | 2017-01-10 | 2018-07-19 | 艾默生环境优化技术(苏州)有限公司 | Compressor |
| CN113339265A (en) * | 2021-07-09 | 2021-09-03 | 珠海格力电器股份有限公司 | Oil blocking structure, compressor and air conditioner with same |
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| JPS62255592A (en) * | 1986-04-28 | 1987-11-07 | Mitsubishi Electric Corp | Rotary compressor |
| JPH01166288U (en) * | 1988-05-11 | 1989-11-21 | ||
| JP3453765B2 (en) * | 1992-04-09 | 2003-10-06 | ダイキン工業株式会社 | Hermetic compressor |
| JPH09151886A (en) * | 1995-11-29 | 1997-06-10 | Sanyo Electric Co Ltd | Hermetic type rotary compressor |
| KR100619741B1 (en) * | 2004-09-13 | 2006-09-12 | 엘지전자 주식회사 | Scroll compressor with oil discharge reduction function |
| KR100802023B1 (en) * | 2006-11-01 | 2008-02-12 | 삼성전자주식회사 | Rotary compressor |
| CN105782053B (en) * | 2014-12-24 | 2018-12-07 | 珠海格力节能环保制冷技术研究中心有限公司 | Compressor |
| CN205937135U (en) * | 2016-08-22 | 2017-02-08 | 珠海凌达压缩机有限公司 | Compressor, refrigerant circulation system and air conditioner |
| CN108286522B (en) * | 2017-01-10 | 2019-12-24 | 艾默生环境优化技术(苏州)有限公司 | Compressor with a compressor housing having a plurality of compressor blades |
| KR20180090677A (en) * | 2017-02-03 | 2018-08-13 | 엘지전자 주식회사 | Rotary compressor |
| CN114183348B (en) * | 2021-12-17 | 2022-08-26 | 珠海格力电器股份有限公司 | Quiet dish subassembly reaches scroll compressor including it |
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Patent Citations (3)
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| CN205779725U (en) * | 2016-05-20 | 2016-12-07 | 珠海凌达压缩机有限公司 | Oil baffle plate and compressor adopting same |
| WO2018130134A1 (en) * | 2017-01-10 | 2018-07-19 | 艾默生环境优化技术(苏州)有限公司 | Compressor |
| CN113339265A (en) * | 2021-07-09 | 2021-09-03 | 珠海格力电器股份有限公司 | Oil blocking structure, compressor and air conditioner with same |
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