CN115523148A

CN115523148A - Oil return structure of compressor, compressor and air conditioner

Info

Publication number: CN115523148A
Application number: CN202211309882.0A
Authority: CN
Inventors: 胡余生; 魏会军; 刘韵
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-10-25
Filing date: 2022-10-25
Publication date: 2022-12-27

Abstract

The invention provides an oil return structure of a compressor, the compressor and an air conditioner, wherein the oil return structure of the compressor comprises a shell, a static disc, a front cover and an exhaust inner cover, an opening is formed in the end face of the front cover facing the static disc, the exhaust inner cover is arranged in the opening and comprises a body and a protruding part, the body is connected with the static disc to form an exhaust area between the body and the static disc, the protruding part is arranged on the body, the inner part of the protruding part is also a hollow cavity and forms an oil distribution cavity, the oil distribution cavity can be communicated with the exhaust area, an oil storage cavity is formed between the outer part of the protruding part and the front cover together, and the oil storage cavity is communicated with the oil distribution cavity; the static disc is arranged in the shell, and the front cover and the shell are welded into a whole. The invention increases the oil storage volume of the lubricating oil and does not increase the weight and the size of the compressor through the effective design on the static disc and the cover body.

Description

Oil return structure of compressor, compressor and air conditioner

Technical Field

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

Background

In the aluminum alloy scroll compressor for the vehicle, a stable oil pool is not arranged in the compressor for an oil pumping system in the compressor to mechanically supply oil to a lubricating part, but lubricating oil is carried by a suction refrigerant of the compressor, and the throttling oil return design is carried out on the lubricating oil after the refrigerant and the lubricating oil are discharged and centrifugally separated. Therefore, the oil return efficiency of the centrifugal separation of the exhaust gas is critical to the performance and reliability of the compressor. The existing centrifugal separation structure is mature, the separation efficiency of the simple centrifugal separation structure is high, and most of lubricating oil can be completely separated from the refrigerant. However, the separated lubricating oil flows back into the compressor again, and the prior art schemes have a large problem and mainly focus on: 1. the oil return and storage structure is unreasonable in arrangement, and the oil storage structure is easily influenced by the centrifugal separation structure, so that the oil storage amount in the actual oil storage structure is small or separated lubricating oil is taken away by the refrigerant; 2. the oil return structure directly adopts a throttling structure to communicate high pressure to a low pressure or medium pressure lubricating part, and because the throttling pressure difference is large, when a large pressure difference working condition exists in actual operation, the throttling is insufficient, so that high pressure gas enters the low pressure or medium pressure part, and the performance of the compressor is influenced; the reflux quantity is too small under the working condition of small pressure difference, the lubricating oil separated by the centrifugal separation structure cannot flow back to the compressor in time, and redundant lubricating oil is in the separation structure and is taken away by the refrigerant again, so that the heat exchange effect of the system is poor.

Patent No. US6511530B2 discloses a structure for discharging and storing oil inside a compressor, as shown in fig. 1, a discharge chamber 13a, an oil-gas separation chamber 11 and a lubricating oil storage chamber 15 are provided between the back surface of a fixed scroll 2 of the compressor and a discharge cover 4. The oil storage cavity 15 returns to the internal suction cavity of the compressor through the oil return channel 2a, and the circulation of lubricating oil in the compressor is realized. However, there are the following problems: in order not to influence the oil separation efficiency of the separation chamber 11, the oil storage chamber 15 is arranged in the gravity direction below the oil separation chamber, and the highest liquid level in the oil storage chamber needs to be lower than the oil outlet 14 of the oil separation chamber, otherwise, the lubricating oil enters the separation chamber to influence the oil separation effect. Therefore, the problem of the same problem of the oil storage chamber technology patent No. CN107575383A is that the oil storage volume is small, and the redundant lubricating oil is still carried into the refrigeration system by the refrigerant. Otherwise, in order to increase the volume of the oil storage chamber, the axial height of the oil storage chamber needs to be increased, which causes problems of large size, heavy weight, high production cost and the like of the compressor. Meanwhile, the pressure in the oil storage cavity is high in exhaust pressure, and is influenced by the exhaust fluctuation of the pump body, and the exhaust pressure fluctuation is large, so that the liquid level in the oil storage cavity is difficult to stabilize and is large along with the exhaust fluctuation.

Patent No. CN107605726a discloses another oil return structure, as shown in fig. 2, an oil return passage 7 in a compressor discharge cover 4 communicates a static disc 3 and a bracket 1, and a throttling channel is arranged in the bracket 1, so that lubricating oil in the oil return passage 7 is introduced into a lubricating cavity 11 in the bracket 1, and lubrication of a bearing in the lubricating cavity is realized. Although directly introduce the lubricated part of key in the compressor with lubricating oil, because hold the chamber in the lubricated chamber 11, the cavity space is restricted, and most lubricating oil can not in time flow back to in the compressor in the oil return route 7, leads to a large amount of lubricating oil can get into refrigerating system along with the exhaust, influences system's heat transfer effect.

The scroll compressor in the prior art has the technical problems that the oil return and storage structure is unreasonable in arrangement, the oil storage structure is easily influenced by a centrifugal separation structure, the oil storage amount in the actual oil storage structure is small, or separated lubricating oil is taken away by refrigerant, and the like, so that the oil return structure of the compressor, the compressor and the air conditioner are researched and designed.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect that the oil return and storage structure of the scroll compressor in the prior art is unreasonable in arrangement, so that the oil storage amount in the actual oil storage structure is small, thereby providing the oil return structure of the compressor, the compressor and the air conditioner.

In order to solve the above problems, the present invention provides an oil return structure of a compressor, including:

the exhaust inner cover comprises a body and a protruding part, the body is connected with the static disc to form an exhaust area between the body and the static disc, the protruding part is arranged on the body, the inside of the protruding part is also a hollow cavity to form an oil distribution cavity, the oil distribution cavity can be communicated with the exhaust area, an oil storage cavity is formed between the outside of the protruding part and the front cover together, and the oil storage cavity is communicated with the oil distribution cavity; the static disc is arranged in the shell, and the front cover and the shell are welded into a whole.

In some embodiments, one end of the protruding portion is connected to an end surface of the body facing the front cover, and the other end of the protruding portion protrudes toward the front cover, the protruding portion has an opening portion, the front cover is provided with an exhaust through hole, an exhaust pipe is inserted into the exhaust through hole, and the exhaust pipe is inserted into the exhaust through hole and is connected to or opposite to the opening portion, so that the oil distribution chamber exhausts gas to the outside of the front cover through the exhaust pipe.

In some embodiments, the oil separator further includes an oil separating member, a part of the oil separating member is disposed in the oil separating chamber, a part of the oil separating member is disposed in the opening portion, the oil separating member is fixedly connected to the opening portion, a flow passage is formed in the oil separating member, one end of the flow passage is communicated with the oil separating chamber, and the other end of the flow passage is communicated with the exhaust pipeline.

In some embodiments, an end surface of the opening portion of the protruding portion is spaced apart from the exhaust through hole by a first predetermined distance, the exhaust line is inserted into the opening portion, or the exhaust line is not inserted into the opening portion and is spaced apart from the end surface of the opening portion by a second predetermined distance; when the exhaust pipeline and the end face of the opening part are separated by a second preset distance, the part with the first preset distance is formed into an exhaust buffer cavity, the circulation channel of the oil separation part is communicated with the exhaust buffer cavity, and the exhaust pipeline is communicated with the exhaust buffer cavity.

In some embodiments, when the exhaust pipeline is inserted into the opening part, an oil storage cavity exhaust hole is arranged on the exhaust pipeline, one end of the oil storage cavity exhaust hole is communicated with the oil storage cavity, and the other end of the oil storage cavity exhaust hole is communicated with the inside of the exhaust pipeline;

work as when the part of first predetermined distance forms to the cushion chamber that exhausts, the orientation of bulge one side of exhaust pipe still is provided with oil storage chamber partition portion, oil storage chamber partition portion will exhaust the cushion chamber with the oil storage chamber seals the partition, be provided with the oil storage chamber intercommunicating pore on the oil storage chamber partition portion, oil storage chamber intercommunicating pore one end with oil storage chamber intercommunication, the other end with the cushion chamber intercommunication that exhausts.

In some embodiments, a side of the body facing the stationary disc forms a third cavity in a recessed manner, the third cavity being formed as part or all of the exhaust region;

the body is further provided with an air inlet channel, one end of the air inlet channel is communicated with the exhaust area to allow air to enter from the exhaust area, and the other end of the air inlet channel is communicated with the oil distribution cavity in the protruding portion.

In some embodiments, the body is provided with a venting cover fastener, and the venting cover fastener can penetrate through the body and be in fit connection with the static disc so as to connect the venting cover and the static disc into a whole.

In some embodiments, still be provided with oil return channel one on the body, oil return channel one is located the periphery of bulge, just oil return channel one is located the regional radial outside of exhaust, be provided with quiet set oil return path on the quiet set, oil return channel one end with oil storage chamber intercommunication, the other end with quiet set oil return path intercommunication, quiet set oil return path can lead oil to the inside lubricated position of treating of compressor.

In some embodiments, an oil discharge channel is arranged on the protruding portion, one end of the oil discharge channel is communicated with the oil distribution cavity, and the other end of the oil discharge channel is communicated with the oil storage cavity, so that oil in the oil distribution cavity can be guided into the oil storage cavity and then enters the first oil return channel.

In some embodiments, the oil discharge channel is arranged at the bottom of the bulge, and the oil discharge channel is opened towards the lower part, the upper end of the oil discharge channel is communicated with the oil distribution chamber, and the lower end of the oil discharge channel is communicated with the space of the oil storage chamber below the bulge; and/or, in vertical section, the lower extreme of protecgulum is the arc structure, the lower extreme of exhaust inner cup is the stair structure, the department of buckling of stair structure is the arc structure.

In some embodiments, the oil discharge channel is a notch opened on a side wall of the protrusion, and an outflow direction of the notch is along an axial direction or a radial direction or an obliquely upward direction of the static disc; and/or in the projection plane of the axial line end face, the oil discharge channel is circular, the bottom of the bulge is of an arc structure, and the oil discharge channel is connected with the arc structure.

In some embodiments, the body further includes an oil return cavity, the oil return cavity is connected to the stationary disc to form an oil return cavity therebetween, and the first oil return channel is disposed on the oil return cavity, such that one end of the first oil return channel is communicated with the oil storage cavity, the other end of the first oil return channel is communicated with the oil return cavity, and the other end of the first oil return channel is communicated with the oil return passage of the stationary disc.

In some embodiments, the air conditioner further comprises a sealing part, the sealing part is arranged on an end face where the static disc is connected with the body, a third oil return channel penetrating through two end faces of the sealing part along the axial direction is arranged on the sealing part, a throttling channel is further arranged on the end face, facing the static disc, of the sealing part, the throttling channel extends on the end face of the sealing part for a preset length, a second oil return channel is further arranged on the static disc, one end of the throttling channel is communicated with the third oil return channel, the other end of the throttling channel is communicated with the second oil return channel, and the second oil return channel can guide oil to an air suction area of the static disc; the oil return passage III is also communicated with the static disc oil return passage so as to guide oil to a back pressure area.

The invention also provides a compressor, which comprises the oil return structure of the compressor.

In some embodiments, the compressor further comprises an upper bracket and a lower bracket, wherein a first boss, a second boss and a ventilation counter bore are arranged on the inner wall of the housing, the static disc and the upper bracket are fixed to the first boss through a first screw fixing piece, the lower bracket is fixed to the second boss through a second screw fixing piece, the first boss and the second boss are respectively formed integrally with the inner wall surface of the housing or formed into an integrated structure through welding or interference connection, and the ventilation counter bore is arranged between two adjacent first bosses and used for sucking air by a pump body of the compressor.

The invention also provides an air conditioner which comprises the compressor.

The oil return structure of the compressor, the compressor and the air conditioner provided by the invention have the following beneficial effects:

1. according to the oil return structure of the compressor, the exhaust inner cover is arranged in the opening on the end face, facing the static disc, of the front cover and comprises the structure of the body and the protruding portion, the exhaust area is defined between the body and the static disc, the protruding portion can effectively form the oil dividing cavity, and the oil dividing cavity is communicated with the exhaust area, so that oil-gas separation can be carried out in the oil dividing cavity; the oil storage cavity is arranged in the upper cover, the volume of the cavity of the oil storage cavity is large, the projection area of the oil storage cavity in the axial direction of the compressor can be set to be large, and the oil storage cavity can be maximally close to the whole disc surface of a static disc of the compressor. The axial height of the reservoir chamber can be reduced by increasing the cross-sectional area of the reservoir chamber. The compressor housing of the present invention is preferably welded to the front cover, thereby resulting in the discharge inner cover having different structural characteristics, but the same oil storage characteristics. When the screw sealing structure is applied to some application places with high requirements on external leakage of the compressor, the extremely low leakage amount can be realized through the welding structure compared with the existing screw sealing structure, the sealing effect is improved, the problem of performance and even reliability caused by refrigerant leakage when the compressor runs for a long time is effectively prevented, and the influence on the external environment caused by the refrigerant leakage is avoided; the front cover, the rear cover and the shell can be made of stainless steel, cast iron, aluminum alloy or titanium alloy, and only welding can be realized.

2. The sealing structure (sealing component) of the oil storage cavity is arranged in the compressor, the oil storage cavity can not leak to the outside of the compressor, and the leakage amount of the compressor equivalent to that of the traditional structure can be kept. And the pressure in the oil storage cavity is the exhaust pressure, and the oil storage cavity and the oil distribution cavity of the cyclone piece are in a communicated structure, so that the throttling is not needed for flow control, and the cyclone gas separated oil can be stored to the greatest extent.

Drawings

FIG. 1a is an internal cross-sectional view of a prior art scroll compressor 1;

FIG. 1b is an internal cross-sectional view of the scroll compressor of background art 2;

FIG. 2 is an internal cross-sectional view of the scroll compressor of the present invention;

FIG. 3 is a top view of the inner discharge cover of the scroll compressor according to the present invention;

FIG. 4 is a perspective view of the front cover of the scroll compressor of the present invention;

FIG. 5 is a perspective view of the housing of the scroll compressor of the present invention;

FIG. 6 is a sectional view showing an inner coupling structure of the scroll compressor of the present invention;

fig. 7 is an internal sectional view of a scroll compressor according to alternative embodiment 1 of the present invention;

FIG. 8 is an internal cross-sectional view of a scroll compressor according to alternative embodiment 2 of the present invention;

fig. 9 is a top view structural view of a stationary plate of a scroll compressor according to alternative embodiment 3 of the present invention.

The reference numerals are represented as:

1. a front cover; 101. a housing mating portion; 102. an oil storage chamber body portion (opening); 103. an exhaust through hole; 2. an inner exhaust cover; 2a, a body; 201. a protrusion (oil distribution chamber setting part); 201a, an opening; 202. a first oil return channel; 203. an oil discharge passage; 204. an air intake passage; 205. an oil storage chamber partition; 206. the oil storage cavity is communicated with the oil storage cavity; 207. an oil return cavity; 3. an exhaust line; 4. a stationary disc; 401. a stationary disc mounting section; 402. a stationary disc oil return passage; 403. an oil return channel II; 5. a movable plate; 6. a housing; 601. a first boss; 602. an upper boss mounting hole; 603. a second boss; 604. a lower boss mounting hole; 605. a vent counterbore; 7. an upper bracket; 8. a motor; 9. a crankshaft; 10. a lower bracket; 1001. a lower bracket mounting part; 11. a binding post; 12. a rear cover; 13. an air intake pipeline; 14. a lower bracket bearing; 15; an upper bracket bearing; 16. a movable disc bearing; 17. an oil separating member; 17a, a flow channel; 18. an exhaust line seal; 19. an oil storage chamber; 20. an oil dividing cavity; 21. an exhaust region; 23. a back pressure region (intermediate pressure region); 24. a suction area; 25. an air vent hole of the oil storage cavity; 26. exhaust cover fasteners (stationary disc fastening screws); 27. a second screw fixing member (lower bracket fastening screw); 28. a first screw fixing member (bracket case attachment screw); 30. a bracket static disc positioning pin; 31. an oil return cavity; 32. an exhaust buffer chamber; 33. a sealing member; 331. an oil return channel III; 332. a throttle passage.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the disclosed embodiments are merely exemplary of the invention, and are not intended to be exhaustive or exhaustive. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1a, the compressor structure in the prior art mainly includes an upper cover of the compressor, a stationary plate, a movable plate, and a driving support structure of the compressor, wherein an exhaust cavity, an oil distribution cavity, and an oil storage cavity are formed between the stationary plate and the upper cover of the compressor, the oil storage cavity is relatively disposed under the oil distribution cavity, and the highest oil storage level in the oil storage cavity corresponds to the oil outlet at the bottom of the oil distribution cavity. The structural positions of an exhaust cavity, an oil distribution cavity and an oil storage cavity in the prior art are arranged on an upper cover, so that the compressor is large in size and heavy in weight, and the oil distribution efficiency is reduced due to the fact that the axial oil distribution length of an oil distribution cavity is limited. Meanwhile, the oil storage cavity is directly communicated with the exhaust cavity through the oil distribution cavity, the middle of the oil storage cavity is not provided with a throttling and pressure reducing structure, the pressure in the oil storage cavity fluctuates along with the exhaust, and the pressure fluctuation between the oil storage cavity and the oil distribution cavity is large, so that the lubricating oil separated from the oil distribution cavity is difficult to enter the oil storage cavity in time and then is taken away through the exhaust, and the oil storage and oil distribution effects are influenced.

As shown in fig. 1b, the prior art compressor has a housing, a bracket, a moving plate, a stationary plate, an upper cover, and a driving member. The lubricating oil separated by the upper cover exhaust oil separating structure is returned to the cavity in the support through the oil return channels arranged in the upper cover, the static disc and the support of the compressor. Two bearings in the lubricating cavity. Because this support cavity is the motion piece holding member, and the cavity space sets up limitedly, and has motion part eccentric bushing and driving disk, has influenced the oil storage capacity of cavity, leads to the lubricating oil of separating to be can not be stored in the compressor completely, and unnecessary lubricating oil still can be taken away by the exhaust and get into the system, influences the system heat transfer.

The invention is illustrated in conjunction with FIGS. 2-9, which illustrate graphically:

an embodiment of the present invention provides an oil return structure of a compressor (preferably, an oil return structure of a scroll compressor), including:

the exhaust inner cover 2 comprises a body 2a and a protruding part 201, the body 2a is connected with the static disc 4 to form an exhaust area 21, the protruding part 201 is arranged on the body 2a, the inside of the protruding part 201 is also a hollow cavity and is formed into an oil dividing cavity 20, the oil dividing cavity 20 can be communicated with the exhaust area 21, the outside of the protruding part 201, the body 2a and the front cover 1 together form an oil storage cavity 19, and the oil storage cavity 19 is communicated with the oil dividing cavity 20; the static disc 4 is arranged in the shell 6, and the front cover 1 and the shell 6 are welded into a whole.

According to the oil return structure of the compressor, the exhaust inner cover is arranged in the opening on the end face, facing the static disc, of the front cover and comprises the structure of the body and the protruding portion, the exhaust area is defined between the body and the static disc, the protruding portion can effectively form the oil dividing cavity, and the oil dividing cavity is communicated with the exhaust area, so that oil-gas separation can be carried out in the oil dividing cavity; the oil storage cavity is arranged in the upper cover, the volume of the cavity of the oil storage cavity is large, the projection area of the oil storage cavity in the axial direction of the compressor can be set to be large, and the oil storage cavity can be maximally close to the whole disc surface of the static disc of the compressor. The axial height of the reservoir chamber can be reduced by increasing the cross-sectional area of the reservoir chamber. The compressor housing of the present invention is preferably welded to the front cover, thereby resulting in the discharge inner cover having different structural characteristics, but the same oil storage characteristics. When the screw sealing structure is applied to some application places with high requirements on external leakage of the compressor, the extremely low leakage amount can be realized through the welding structure compared with the existing screw sealing structure, the sealing effect is improved, the problem of performance and even reliability caused by refrigerant leakage when the compressor runs for a long time is effectively prevented, and the influence on the external environment caused by the refrigerant leakage is avoided; the front cover, the rear cover and the shell can be made of stainless steel, cast iron, aluminum alloy or titanium alloy, and only welding can be realized.

The oil storage cavity is arranged in the upper cover, the volume of the cavity of the oil storage cavity is large, the projection area of the oil storage cavity in the axial direction of the compressor can be set to be large, and the oil storage cavity can be maximally close to the whole disc surface of the static disc of the compressor. The axial height of the reservoir chamber can be reduced by increasing the cross-sectional area of the reservoir chamber. Meanwhile, the sealing structure of the oil storage cavity is arranged inside the compressor, the oil storage cavity cannot leak like the outside of the compressor, and the leakage amount of the compressor equivalent to that of the traditional structure can be kept. And the pressure in the oil storage cavity is exhaust pressure, and the oil separating cavity of the cyclone piece is of a communicating structure, so that throttling is not needed for flow control, and the cyclone-air separated oil can be stored to the greatest extent.

The following technical problems are solved:

1. the oil storage cavity is hermetically arranged in the compressor, so that the oil storage volume of lubricating oil in the compressor is increased;

2. the compressor body is welded and sealed (the shell is welded with the front cover and the rear cover), and the sealing mode is different from the existing screw connection sealing mode, so that the sealing performance of the compressor is improved.

The invention relates to an oil return and storage structure of a scroll compressor, which is arranged in an exhaust cover of the compressor, and is used for storing lubricating oil after exhaust and separation in an oil storage cavity, and meanwhile, the oil storage cavity is communicated with the interior of the compressor through an oil return passage to return the lubricating oil to a medium-pressure part and a low-pressure part of the compressor, so that the storage and the oil return of the lubricating oil are realized.

The invention discloses a compressor structure, which comprises a front cover 1, a shell 6, a rear cover 12, a static disc 4 and an exhaust inner cover 2, wherein the front cover and the rear cover are respectively welded with the shell, the exhaust inner cover is arranged in the front cover, an exhaust area 21 sealed with the back of the static disc is formed, and an oil storage cavity 19 is formed with the front cover, as shown in figure 2.

The compressor housing of the present invention is of welded construction, with the front cover and housing welded, resulting in an inner discharge cover having different structural characteristics, but the same oil storage characteristics. When describing welding, the front cover, the rear cover and the case may be made of stainless steel, cast iron, aluminum alloy or titanium alloy as long as welding can be achieved. The advantage of welding lies in for some application places that require highly to compressor external leakage, and current screw seal structure is unreliable, and the welding can realize the leakage quantity that extremely hangs down. The compressor can not cause refrigerant leakage to cause performance and even reliability problems in long-term operation. The external environment is not affected by the refrigerant leakage.

As shown in fig. 2, the compressor driving and compressing unit of the present invention is disposed between the front cover 1, the housing 6 and the rear cover 12. The compression unit consists of a static disc 4 and a dynamic disc 5, and the driving unit consists of a motor 8 and a crankshaft 9. The compression unit is driven by the driving unit to compress and discharge the refrigerant. Meanwhile, the compressor is also provided with an upper bracket 7, an oil separating piece 17, an oil separating cavity 20 and an oil storage cavity 19. The oil reservoir 19 is a space defined by the other side surface of the inner exhaust cover and the inner surface of the front cover.

In some embodiments, one end of the protruding portion 201 is connected to an end surface of the main body 2a facing the front cover 1, and the other end protrudes toward the front cover 1, the protruding portion 201 has an opening portion 201a, the front cover 1 is provided with an exhaust through hole 103, an exhaust pipe 3 is inserted into the exhaust through hole 103, and the exhaust pipe 3 is inserted from the exhaust through hole 103 to be in contact with or opposite to the opening portion 201a, so that the oil distribution chamber 20 exhausts gas to the outside of the front cover 1 through the exhaust pipe 3.

Core invention point 2: as shown in fig. 2 and 3, the above-described inner discharge cover is characterized in that an oil distribution chamber arrangement portion (i.e., a projection 201) is formed in the inner discharge cover 2, and an oil distribution chamber 20 is provided therein, and one end thereof is opened for arranging the oil separating member 17 in connection with the discharge line 3. The exhaust inner cover is also provided with an air inlet channel 204 communicated with the exhaust area 21 and the oil distribution cavity 20, and an oil discharge channel 203 which is at least one part and is arranged at the bottom of the oil distribution cavity and can be axially or radially arranged for communicating the oil distribution cavity 20 and the oil storage cavity 19, so that separated lubricating oil enters the oil storage cavity 19. Meanwhile, an oil return channel I202 is further arranged and used for communicating the oil storage cavity 19 with the static disc oil return passage 402, so that lubricating oil in the oil storage cavity returns to enter a part to be lubricated in the compressor. The discharge cover is fastened to the stationary disk by fastening screws (discharge cover fasteners 26). In which a sealing member is provided to effect sealing of the exhaust area 21.

In some embodiments, the oil separator 17 is further included, a part of the oil separator 17 is disposed in the oil-separating chamber 20, a part of the oil separator 17 is disposed in the opening portion 201a, the oil separator 17 is fixedly connected to the opening portion 201a, a flow passage 17a is formed in the oil separator 17, one end of the flow passage 17a is in flow communication with the oil-separating chamber 20, and the other end of the flow passage 17a is in communication with the exhaust pipe 3.

In some embodiments, an end face of the opening portion 201a of the protrusion 201 is spaced from the vent through hole 103 by a first preset distance, and the vent line 3 is inserted into the opening portion 201a, or the vent line 3 is not inserted into the opening portion 201a and is spaced from the end face of the opening portion 201a by a second preset distance;

when the exhaust pipe 3 is spaced apart from the end surface of the opening portion 201a by a second predetermined distance, the portion of the first predetermined distance is formed as an exhaust buffer chamber 32, the flow passage 17a of the oil separator 17 communicates with the exhaust buffer chamber 32, and the exhaust pipe 3 communicates with the exhaust buffer chamber 32.

In some embodiments, when the exhaust pipe 3 is inserted into the opening portion 201a, an oil storage chamber exhaust hole 25 is formed in the exhaust pipe 3, and one end of the oil storage chamber exhaust hole 25 communicates with the oil storage chamber 19 and the other end communicates with the inside of the exhaust pipe 3;

when the part of first default distance forms to exhaust cushion chamber 32, the orientation of bulge 201 one side of exhaust pipe 3 still is provided with oil storage chamber partition 205, oil storage chamber partition 205 will exhaust cushion chamber 32 with oil storage chamber 19 seals the partition, be provided with oil storage chamber intercommunicating pore 206 on the oil storage chamber partition 205, oil storage chamber intercommunicating pore 206 one end with oil storage chamber 19 intercommunication, the other end with exhaust cushion chamber 32 intercommunication.

Core invention point 3: as shown in figure 2, the connection seal between the exhaust inner cover and the front cover is provided with an exhaust pipeline 3, the front cover is provided with an exhaust through hole 103, an exhaust channel passes through the exhaust through hole 103 to enter an oil storage cavity 19, then is inserted into an oil distribution cavity 20 of the exhaust inner cover, and is pressed in through interference fit with the oil distribution cavity by an exhaust pipeline sealing element 18, and meanwhile, the connection seal can be realized by a conventional O-shaped ring. The exhaust passage is also provided with an oil storage cavity exhaust hole 25 for communicating the inside of the exhaust passage with the oil storage cavity 19, and refrigerant gas in the oil storage cavity is discharged through the exhaust passage under the action of the exhaust hole, so that the pressure of the oil storage cavity is prevented from rising due to the accumulation of the refrigerant in the oil storage cavity, and lubricating oil is difficult to enter. In addition, in another structure, the exhaust pipeline 3 and the exhaust inner cover 2 can be in clearance fit in an unsealed state, the exhaust pipeline sealing element 18 and the oil storage cavity exhaust hole 25 are not needed, and the gas in the oil storage cavity is exhausted through the clearance between the exhaust pipeline 3 and the exhaust inner cover 2.

In the core invention point 6, as shown in fig. 8, the inner discharge cover 2 of the present invention has the oil reservoir partition 205, and is divided into the oil reservoir 19 and the discharge buffer chamber 32 with the front cover 1, so that the discharge line 3 is connected to the front cover 1 and is not connected to the inner discharge cover 2. The exhaust gas firstly enters the exhaust buffer cavity 32 after being exhausted from the oil distribution cavity and then is exhausted through the exhaust pipeline 3, and the lubricating oil still existing in the exhaust gas can be further separated while the exhaust buffer cavity buffers. The separated lubricating oil is communicated through the oil reservoir communication hole 206.

The effect of the arrangement can reduce the vibration of the compressor exhaust pipeline caused by the exhaust pulsation, and meanwhile, the effect of maximum exhaust oil separation can be further realized by arranging the double-channel separation structure in the compressor. In addition, the assembly difficulty of the exhaust channel and the exhaust inner cover can be reduced, and the production cost is reduced.

In some embodiments, a side of the body 2a facing the stationary disc 4 forms a third cavity in a concave manner, the third cavity being formed as part or all of the exhaust region 21;

the body 2a is further provided with an air intake passage 204, one end of the air intake passage 204 is communicated with the air exhaust region 21 to intake air from the air exhaust region 21, and the other end of the air intake passage 204 is communicated with the oil dividing chamber 20 inside the protruding portion 201.

In some embodiments, the body 2a is provided with a venting cover fastener 26, and the venting cover fastener 26 can penetrate through the body 2a and is connected with the static disc 4 in a matching manner so as to connect the venting cover 2 and the static disc 4 into a whole.

In some embodiments, a first oil return channel 202 is further disposed on the body 2a, the first oil return channel 202 is located on the outer periphery of the protruding portion 201, the first oil return channel 202 is located on the radial outer side of the exhaust area 21, a first static disc oil return passage 402 is disposed on the static disc 4, one end of the first oil return channel 202 is communicated with the oil storage cavity 19, the other end of the first oil return channel is communicated with the static disc oil return passage 402, and the static disc oil return passage 402 can guide oil to a to-be-lubricated part inside the compressor.

In some embodiments, an oil discharge channel 203 is disposed on the protruding portion 201, and one end of the oil discharge channel 203 is communicated with the oil distribution chamber 20, and the other end is communicated with the oil storage chamber 19, so that the oil in the oil distribution chamber 20 can be guided into the oil storage chamber 19 and then enter the oil return channel 202.

In some embodiments, the oil discharge channel 203 is disposed at the bottom of the protruding portion 201, and the oil discharge channel 203 opens downward, and the upper end of the oil discharge channel 203 communicates with the oil distribution chamber 20 and the lower end communicates with the space of the oil storage chamber 19 below the protruding portion 201; and/or, in vertical section, the lower extreme of protecgulum 1 is the arc structure, the lower extreme of exhaust inner cup 2 is the stair structure, the department of buckling of stair structure is the arc structure.

In some embodiments, the oil drainage channel 203 is a notch opened on the side wall of the protrusion 201, and the outflow direction of the notch is along the axial direction or the radial direction or the obliquely upward direction of the static disk 4; and/or in the projection plane of the axial end face, the oil discharge channel 203 is circular, the bottom of the bulge 201 is of an arc structure, and the oil discharge channel 203 is connected with the arc structure.

In some embodiments, the body 2a further includes an oil return cavity 207, the oil return cavity 207 is connected to the static disc to form an oil return cavity 31 therebetween, the first oil return channel 202 is disposed on the oil return cavity 207, such that one end of the first oil return channel 202 is communicated with the oil storage cavity 19, the other end of the first oil return channel 202 is communicated with the oil return cavity 31, and the other end of the oil return cavity 31 is communicated with the oil return passage 402 of the static disc.

The core invention point 5; as shown in fig. 7, the inner exhaust cover 2 is further provided with an oil return cavity 207 which is substantially disposed at a lower portion of the oil storage cavity and forms an oil return cavity 31 in cooperation with the stationary disc mounting portion 401, the oil return cavity and the oil storage cavity are connected through an oil return passage one 202, and the oil return cavity and a lubricated portion inside the compressor are connected through a stationary disc oil return passage 402. The oil return cavity is added to relieve the mixing degree of oil and gas in the oil storage cavity 19, because the oil return flow rate entering from the oil discharge channel 203 is larger, the flow rate in the oil storage cavity 19 is still larger, the oil return cavity 31 can play a role in buffering lubricating oil, the oil return channel 402 entering the static disc is most of the lubricating oil, and the lubricating effect is improved.

In some embodiments, the air conditioner further comprises a sealing member 33, the sealing member 33 is disposed on an end surface of the static disc 4, which is connected to the body 2a, the sealing member 33 is provided with a third oil return passage 331 axially penetrating through the two end surfaces of the sealing member 33, an end surface of the sealing member 33, which faces the static disc 4, is further provided with a throttling passage 332, the throttling passage 332 extends for a preset length on the end surface of the sealing member 33, the static disc 4 is further provided with a second oil return passage 403, one end of the throttling passage 332 is communicated with the third oil return passage 331, the other end of the throttling passage 332 is communicated with the second oil return passage 403, and the second oil return passage 403 can guide oil to the air suction area 24 of the static disc; the oil return passage three 331 also communicates with the static disc oil return passage 402 to enable oil to be directed to the back pressure area 23.

In the core invention 7, as shown in fig. 9, a seal member 33 (preferably a seal gasket) is provided at the outer peripheral joint of the stationary plate and the inner discharge cover, the seal gasket has a throttle passage 332 provided in a covered area where the stationary plate and the inner discharge cover are in contact with each other, one end of the throttle passage is connected to a third oil return passage 331, the other end thereof is connected to the inside of the stationary plate mounting portion 401, a second oil return passage 403 is provided in the stationary plate mounting portion 401, and the other end thereof communicates with the suction area 24 of the pump body. And one end of the oil return channel III 331 is communicated with the static disc oil return passage 402, and the other end is communicated with the oil return channel I202 of the inner cover. That is, when the lubricant in the oil storage chamber reaches the oil return passage three 331 of the sealing member 33 through the oil return passage one 202 of the inner cover, the lubricant is divided into two parts, one part enters the medium pressure area (back pressure area 23) through the oil return passage of the static disc, and the other part enters the air suction area 24 through the oil return passage two 403 after passing through the throttling passage 332.

The present invention also provides a compressor, preferably a scroll compressor, comprising an oil return structure of the compressor of any one of the preceding claims.

In some embodiments, the compressor further comprises an upper bracket 7 and a lower bracket 10, a first boss 601, a second boss 603 and a ventilation counter bore 605 are arranged on the inner wall of the casing 6, the static disc 4 and the upper bracket 7 are fixed on the first boss 601 through a first screw fixing piece 28, the lower bracket 10 is fixed on the second boss 603 through a second screw fixing piece 27, the first boss 601 and the second boss 603 are respectively formed integrally with the inner wall surface of the casing 6 or are formed into an integral structure through welding or interference connection, and the ventilation counter bore 605 is arranged between two adjacent first bosses 601 and is used for sucking air by a pump body of the compressor.

Core invention point 4: as shown in FIG. 5, the casing of the present invention has a variable cross-sectional shape, and is substantially fitted with the motor mounting side at the motor outer diameter, and is substantially fitted with the stationary disk mounting side at the motor mounting side at the smaller outer diameter. The casing is internally provided with a first boss 601 (upper boss) and a second boss 603 (lower boss), the mounting boss can be integrally formed with the casing 6, and can also be connected to the casing in a welding or interference manner and the like, the first boss 601 for fixing the upper bracket 7 of the compressor and the second boss 603 for fixing the lower bracket 10 are respectively provided, and meanwhile, the upper boss is also provided with a ventilation counter bore 605 for sucking the compressor pump body. As shown in fig. 6, the stationary plate 4 and the upper bracket 7 are coupled to the first boss 601 by the first screw fixing member 28, and the lower bracket 10 is fixed to the second boss 603 by the second screw fixing member 27.

The invention also provides an air conditioner which comprises the compressor.

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 above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. An oil return structure of compressor which characterized in that: the method comprises the following steps:

the oil-saving device comprises a shell (6), a static disc (4), a front cover (1) and an exhaust inner cover (2), wherein an opening is formed in the end face, facing the static disc (4), of the front cover (1), the exhaust inner cover (2) is arranged in the opening, the exhaust inner cover (2) comprises a body (2 a) and a protruding portion (201), the body (2 a) is connected with the static disc (4) to form an exhaust area (21) between the body and the static disc, the protruding portion (201) is arranged on the body (2 a), the inside of the protruding portion (201) is also a hollow cavity and forms an oil separating cavity (20), the oil separating cavity (20) can be communicated with the exhaust area (21), an oil storage cavity (19) is formed between the body (2 a) and the front cover (1) together, and the oil storage cavity (19) is communicated with the oil separating cavity (20); the static disc (4) is arranged in the shell (6), and the front cover (1) and the shell (6) are welded into a whole.

2. The oil return structure of a compressor according to claim 1, wherein:

one end of the protruding portion (201) is connected to the orientation of the body (2 a) on the end face of the front cover (1), the other end of the protruding portion protrudes towards the direction of the front cover (1), the protruding portion (201) is provided with an opening portion (201 a), an exhaust through hole (103) is arranged on the front cover (1), an exhaust pipeline (3) is inserted into the exhaust through hole (103), the exhaust pipeline (3) is inserted into the exhaust through hole (103) and connected with or opposite to the opening portion (201 a), so that the oil distribution cavity (20) discharges gas to the outside of the front cover (1) through the exhaust pipeline (3).

3. The oil return structure of a compressor according to claim 2, wherein:

the oil separation device is characterized by further comprising an oil separation piece (17), wherein part of the oil separation piece (17) is arranged in the oil separation cavity (20), part of the oil separation piece is arranged in the opening part (201 a), the oil separation piece (17) is fixedly connected with the opening part (201 a), a circulation passage (17 a) is formed in the oil separation piece (17), one end of the circulation passage (17 a) is communicated with the oil separation cavity (20), and the other end of the circulation passage is communicated with the exhaust pipeline (3).

4. The oil return structure of a compressor according to claim 3, wherein:

the end face of the opening part (201 a) of the bulge part (201) is separated from the exhaust through hole (103) by a first preset distance, the exhaust pipeline (3) is inserted into the opening part (201 a), or the exhaust pipeline (3) is not inserted into the opening part (201 a) and is separated from the end face of the opening part (201 a) by a second preset distance;

when the exhaust pipeline (3) is separated from the end face of the opening part (201 a) by a second preset distance, the part of the first preset distance is formed into an exhaust buffer cavity (32), the circulation passage (17 a) of the oil separating piece (17) is communicated with the exhaust buffer cavity (32), and the exhaust pipeline (3) is communicated with the exhaust buffer cavity (32).

5. The oil return structure of a compressor according to claim 4, wherein:

when the exhaust pipeline (3) is inserted into the opening part (201 a), an oil storage cavity exhaust hole (25) is formed in the exhaust pipeline (3), one end of the oil storage cavity exhaust hole (25) is communicated with the oil storage cavity (19), and the other end of the oil storage cavity exhaust hole is communicated with the inside of the exhaust pipeline (3);

when the part of first preset distance forms exhaust cushion chamber (32), the orientation of bulge (201) one side of exhaust pipe (3) still is provided with oil storage chamber partition (205), oil storage chamber partition (205) will exhaust cushion chamber (32) with oil storage chamber (19) seal the partition, be provided with oil storage chamber intercommunicating pore (206) on oil storage chamber partition (205), oil storage chamber intercommunicating pore (206) one end with oil storage chamber (19) intercommunication, the other end with exhaust cushion chamber (32) intercommunication.

6. The oil return structure of a compressor according to any one of claims 1 to 5, wherein:

a side surface of the body (2 a) facing the static disc (4) forms a third cavity in a concave mode, and the third cavity is formed to be a part or the whole of the exhaust area (21);

an air inlet channel (204) is further arranged on the body (2 a), one end of the air inlet channel (204) is communicated with the exhaust area (21) to supply air from the exhaust area (21), and the other end of the air inlet channel (204) is communicated with the oil distribution cavity (20) in the protruding portion (201).

7. The oil return structure of a compressor according to any one of claims 1 to 6, wherein:

the exhaust cover is characterized in that an exhaust cover fastener (26) is arranged on the body (2 a), and the exhaust cover fastener (26) can penetrate through the body (2 a) and is matched and connected with the static disc (4) so as to connect the exhaust inner cover (2) and the static disc (4) into a whole.

8. The oil return structure of a compressor according to claim 1, wherein:

still be provided with oil return channel (202) on body (2 a), oil return channel (202) are located the periphery of bulge (201), just oil return channel (202) are located the radial outside of exhaust region (21), be provided with quiet set oil return route (402) on quiet dish (4), the one end of oil return channel (202) with oil storage chamber (19) intercommunication, the other end with quiet set oil return route (402) intercommunication, quiet set oil return route (402) can lead oil to the inside lubricated position of treating of compressor.

9. The oil return structure of a compressor according to claim 8, wherein:

be provided with oil extraction passageway (203) on bulge (201), the one end of oil extraction passageway (203) with divide oil pocket (20) intercommunication, the other end with oil storage chamber (19) intercommunication, with can with the oil that divides oil pocket (20) leads to in oil storage chamber (19), and then get into in oil return passageway (202).

10. The oil return structure of a compressor according to claim 9, wherein:

the oil discharge channel (203) is arranged at the bottom of the bulge (201), the oil discharge channel (203) is opened downwards, the upper end of the oil discharge channel (203) is communicated with the oil distribution cavity (20), and the lower end of the oil discharge channel is communicated with a space of the oil storage cavity (19) below the bulge (201); and/or, in the longitudinal section, the lower extreme of protecgulum (1) is the arc structure, the lower extreme of exhaust inner cup (2) is the stair structure, the department of buckling of stair structure is the arc structure.

11. The oil return structure of a compressor according to claim 9, wherein:

the oil discharge channel (203) is a notch formed in the side wall of the protruding part (201), and the outflow direction of the notch is along the axial direction or the radial direction or the upward inclined direction of the static disc (4); and/or in the projection plane of the axial end face, the oil discharge channel (203) is circular, the bottom of the bulge (201) is of an arc structure, and the oil discharge channel (203) is connected with the arc structure.

12. The oil return structure of a compressor according to claim 8, wherein:

the body (2 a) still includes oil return cavity (207), oil return cavity (207) with the quiet dish meets and forms oil return chamber (31) between the two, oil return passageway (202) set up in on oil return cavity (207), make the one end of oil return passageway (202) with oil storage chamber (19) intercommunication, the other end with oil return chamber (31) intercommunication, the other end of oil return chamber (31) with quiet dish oil return passageway (402) intercommunication.

13. The oil return structure of a compressor according to claim 8, wherein:

the oil-saving air conditioner further comprises a sealing part (33), the sealing part (33) is arranged on the end face of the static disc (4) connected with the body (2 a), a third oil return channel (331) penetrating through two end faces of the sealing part (33) along the axial direction is arranged on the sealing part (33), a throttling channel (332) is further arranged on the end face of the sealing part (33) facing the static disc (4), the throttling channel (332) extends on the end face of the sealing part (33) for a preset length, a second oil return channel (403) is further arranged on the static disc (4), one end of the throttling channel (332) is communicated with the third oil return channel (331), the other end of the throttling channel is communicated with the second oil return channel (403), and the second oil return channel (403) can guide oil to an air suction area (24) of the static disc; the oil return passage three (331) is also in communication with the static disc oil return passage (402) to enable oil to be directed to a back pressure area (23).

14. A compressor, characterized by: an oil return structure including the compressor of any one of claims 1 to 13.

15. The oil return structure of a compressor according to claim 14, wherein:

the air suction device is characterized by further comprising an upper support (7) and a lower support (10), wherein a first boss (601), a second boss (603) and a ventilation counter bore (605) are arranged on the inner wall of the shell (6), the static disc (4) and the upper support (7) are fixed onto the first boss (601) through a first screw fixing piece (28), the lower support (10) is fixed onto the second boss (603) through a second screw fixing piece (27), the first boss (601) and the second boss (603) are integrally formed with the inner wall surface of the shell (6) or are integrally formed in a welded or interference connection mode, and the ventilation counter bore (605) is arranged between two adjacent first bosses (601) and used for sucking air of a pump body of the compressor.

16. An air conditioner, characterized in that: comprising a compressor as claimed in claim 14 or 15.