CN107654373B

CN107654373B - Scroll compressor and air conditioner with same

Info

Publication number: CN107654373B
Application number: CN201710938165.7A
Authority: CN
Inventors: 刘双来; 康小丽; 单彩侠; 江国彪; 陈肖汕; 刘韵; 李成祥
Original assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Current assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Priority date: 2017-10-09
Filing date: 2017-10-09
Publication date: 2023-07-14
Anticipated expiration: 2037-10-09
Also published as: CN107654373A

Abstract

The invention provides a scroll compressor and an air conditioner with the same, wherein the scroll compressor comprises: the device comprises a shell provided with an oil storage cavity, a bracket arranged in the shell, a fixed scroll, a movable scroll and a back pressure cavity. Be equipped with the passageway of crossing between oil storage chamber and the backpressure chamber, the passageway of crossing includes the first drainage passageway in the casing, the second drainage passageway on the quiet vortex dish, the third drainage passageway and the connecting piece of intercommunication second drainage passageway and backpressure chamber, and the first end setting of connecting piece is in the second drainage passageway, and the second end setting of connecting piece is in the third drainage passageway, and the connecting piece is hollow structure. The technical scheme of the invention effectively solves the problem that lubricating oil and refrigerant leak to the air suction side from the gap between the fixed scroll and the end face of the bracket in the prior art.

Description

Scroll compressor and air conditioner with same

Technical Field

The invention relates to the field of air conditioners, in particular to a scroll compressor and an air conditioner with the scroll compressor.

Background

In scroll compressors, compression chamber gas is compressed to create a force that moves the orbiting scroll away from the non-orbiting scroll. This separation force may create an axial gap between the orbiting and non-orbiting scrolls, thereby causing the compression chamber to leak. In addition, the operating parts of the compressor, such as bearings and the like, require the introduction of lubricating oil to ensure reliable operation thereof. To solve the above-described problems, in the invention patent of patent publication No. CN106401952a, by forming a back pressure fluid between the discharge and suction of the orbiting scroll at the back surface thereof, the separation force generated by the compression chamber is offset and the orbiting scroll is pressed against the fixed scroll, thereby suppressing leakage of the compression chamber; meanwhile, lubricating oil is throttled by a drainage channel from the exhaust side of the compressor and then introduced into the back pressure cavity, so that moving parts such as bearings and the like in the back pressure cavity are lubricated. However, the above-mentioned patent has the following drawbacks: (1) When the back pressure is large, the movable vortex plate pushes the fixed vortex plate away from the bracket, so that at the outlet of the drainage channel, refrigerant and lubricating oil can leak to the suction side along a gap between the fixed vortex plate and the end surface of the bracket; (2) Because the boss on the inner side of the bracket is uneven, a gap may exist in a local area between the elastic element and the boss on the inner side of the bracket, thereby causing the fluid in the back pressure chamber to leak to the suction side. The presence of such leakage can reduce the compressor suction mass flow and performance. (3) When the area of the throttling channel of the drainage channel is large, throttling is insufficient, fluid entering the back pressure cavity from the exhaust side is excessive, and the fluid in the back pressure cavity further enters the compression cavity through the back pressure hole on the movable scroll, so that the pressure of the compression cavity is increased, and the compression power consumption is increased.

Disclosure of Invention

The invention aims to provide a scroll compressor and an air conditioner with the same, which are used for solving the problem that lubricating oil and refrigerant leak to an air suction side from a gap between a fixed scroll and an end face of a bracket in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided a scroll compressor comprising: the shell comprises a shell and a machine head cover connected with the shell, a first air suction port is arranged on the shell, and a first air exhaust port and an oil storage cavity communicated with the first air exhaust port are arranged on the machine head cover; the fixed vortex plate and the movable vortex plate are arranged in the shell, and the fixed vortex plate is provided with a second air suction port communicated with the first air suction port and a second air exhaust port communicated with the first air exhaust port; a bracket arranged at one side of the movable vortex plate facing the first air suction port; the scroll compressor further comprises a flow passage which is communicated with the back pressure cavity and the oil storage cavity of the scroll compressor, wherein the flow passage comprises a first flow guide channel arranged in the cover of the compressor, a second flow guide channel arranged on the fixed scroll and a third flow guide channel which is communicated with the second flow guide channel and the back pressure cavity; the connecting piece is further arranged in the overflow passage, the first end of the connecting piece is arranged in the second drainage channel, the second end of the connecting piece is arranged in the third drainage channel, and the connecting piece is of a hollow structure.

Further, the connecting piece is a connecting pin.

Further, the first end of the connecting pin is in interference fit with the fixed scroll, the second end of the connecting pin is in clearance fit with the bracket, or the first end of the connecting pin is in clearance fit with the fixed scroll, and the second end of the connecting pin is in interference fit with the bracket.

Further, the scroll compressor further comprises a gasket, the gasket is arranged between the movable scroll and the bracket, and the connecting piece is arranged in the gasket in a penetrating mode.

Further, the bracket is also provided with a fastener which can pass through the gasket to limit the movement of the gasket relative to the bracket.

Further, the fastener comprises a large-diameter section and a small-diameter section, a step surface is formed between the large-diameter section and the small-diameter section, and the fastener abuts the gasket on the bracket through the step surface.

Further, the movable scroll comprises an end face facing the support and a containing groove arranged on the end face, and a floating sealing ring is arranged in the containing groove and used for sealing the back pressure cavity.

Further, a throttle structure is provided in at least one of the second and third drainage channels.

Further, the throttling structure is a throttling pin, the throttling pin comprises a head and a rod, the head is in contact with the inner wall of the second drainage channel or the inner wall of the third drainage channel, the diameter of the rod is smaller than the inner diameter of the second drainage channel or the inner diameter of the third drainage channel, and a communicating part is arranged on the head.

Further, the throttle pin further includes a connecting portion connected between the head portion and the rod portion, and a diameter of the connecting portion is smaller than a diameter of the rod portion.

Further, the head is in interference fit with the second and/or third drainage channels.

Further, the throttle structure is a throttle screw.

According to another aspect of the present invention, there is provided an air conditioner including a compressor, which is the above-described scroll compressor.

Further, the air conditioner is a vehicle-mounted air conditioner.

By applying the technical scheme of the invention, the refrigerant enters the shell from the first air suction port and flows into the compression cavity between the fixed scroll and the movable scroll from the second air suction port. The refrigerant compressed to a certain extent enters the back pressure chamber from the compression chamber through the back pressure passage to provide a force against the fixed scroll to the orbiting scroll. The fully compressed refrigerant is discharged from the second discharge port to the first discharge port on the head cover. And finally, the gaseous refrigerant flows out of the first exhaust port, and the lubricating oil and a small amount of refrigerant carried by the refrigerant are collected into the oil storage cavity and flow back into the back pressure cavity through the flow passage, so that lubrication is provided for the scroll compressor structure. When the back pressure cavity pressure is too large to push the movable scroll away from the support, and then the fixed scroll is separated from the support, two ends of the hollow connecting piece still can be kept to be positioned in the second drainage channel and the third drainage channel, so that the whole continuity of the circulation channel is ensured, lubricating oil and refrigerant can flow to the back pressure cavity, the lubricating oil and the refrigerant are prevented from leaking to the air suction side from a gap between the fixed scroll and the end face of the support, and the performance of the compressor is further influenced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

FIG. 1 shows a schematic view of a partial cross-sectional structure of an embodiment one of a scroll compressor according to the present invention;

FIG. 2 shows an enlarged partial schematic view of the scroll compressor of FIG. 1 at A;

FIG. 3 illustrates an exploded view of the bracket, gasket, orbiting scroll and non-orbiting scroll of the scroll compressor of FIG. 1;

FIG. 4 shows a schematic top view of the gasket of FIG. 3;

FIG. 5 illustrates a partially enlarged schematic view of the scroll compressor of FIG. 1 at B;

FIG. 6 shows a schematic cross-sectional view of another floating seal ring;

FIG. 7 shows a schematic view of a partial cross-sectional structure of a second embodiment of a scroll compressor according to the present invention;

FIG. 8 illustrates a partially enlarged schematic view of the scroll compressor of FIG. 7 at C;

FIG. 9 illustrates a partially enlarged schematic view of the scroll compressor of FIG. 7 at D;

FIG. 10 illustrates a schematic view of the structure of a throttle pin in the scroll compressor of FIG. 9;

FIG. 11 shows a refrigerant leakage ratio schematic of the scroll compressor of FIG. 7;

FIG. 12 shows a schematic view of a partial cross-sectional structure of a third embodiment of a scroll compressor according to the present invention;

FIG. 13 illustrates an exploded view of a bracket, an orbiting scroll, and a non-orbiting scroll of the scroll compressor of FIG. 12; and

fig. 14 shows a partially cross-sectional structural schematic view of a fourth embodiment of a scroll compressor according to the present invention.

Wherein the above figures include the following reference numerals:

1. a housing; 2. a bracket; 2a, pin holes; 2b, a supporting surface; 2c, pin holes; 3. an orbiting scroll; 3c, end faces; 3d, accommodating grooves; 4. a fixed scroll; 4e, a second air suction port; 5. a camera cover; 6. a rubber seal ring; 7. a seal ring; 8. a gasket; 9. a crankshaft; 10. an elastic member; 11. a floating seal ring; 12. a bearing; 13. a throttle screw; 14. a connecting pin; 15. a fastener; 15a, a small diameter section; 15b, a large diameter section; 16. a throttle pin; 16a, a stem; 16b, a connection portion; 16c, a head; 17. a sealing member; 101. a first suction chamber; 102. a second suction chamber; 103. a third air suction chamber; 200. a compression chamber; 201. an exhaust chamber; 202. an exhaust passage; 203. an oil storage chamber; 301. a second drainage channel; 302. a flow hole; 303. a third drainage channel; 304. a back pressure channel; 401. a back pressure chamber.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Embodiment one:

as shown in fig. 1, the scroll compressor of the first embodiment includes a housing, a bracket 2, a fixed scroll 4, and an orbiting scroll 3. Wherein, the casing includes casing 1 and aircraft nose lid 5, and aircraft nose lid 5 is connected on casing 1. The casing 1 is provided with a first air suction port, and the machine head cover 5 is provided with a first air exhaust port and an oil storage cavity 203 communicated with the first air exhaust port. The fixed scroll 4 and the movable scroll 3 are disposed in the casing 1, a second air inlet 4e communicating with the first air inlet and a second air outlet communicating with the first air outlet are disposed on the fixed scroll 4, and a compression chamber 200 is formed between the fixed scroll 4 and the movable scroll 3. The support 2 is arranged at one side of the movable scroll 3 facing the first air suction port, a back pressure cavity 401 is formed between the support 2 and the movable scroll 3, and a back pressure channel 304 which is communicated with the compression cavity 200 and the back pressure cavity 401 is arranged on the movable scroll 3. The scroll compressor further includes a flow passage communicating the oil storage chamber 203 and the back pressure chamber 401, the flow passage including a first flow guide passage provided in the head cover 5, a second flow guide passage 301 provided on the fixed scroll 4, and a third flow guide passage 303 communicating the second flow guide passage 301 and the back pressure chamber 401. The flow passage is also provided with a connecting piece, a first end of the connecting piece is arranged in the second drainage channel 301, a second end of the connecting piece is arranged in the third drainage channel 303, and the connecting piece is of a hollow structure.

With the technical solution of the present embodiment, the refrigerant enters the casing 1 from the first suction port and flows into the compression chamber 200 between the fixed scroll 4 and the movable scroll 3 from the second suction port 4 e. The refrigerant compressed to some extent is introduced from the compression chamber 200 into the back pressure chamber 401 through the back pressure passage 304 to provide the orbiting scroll 3 with a force against the fixed scroll 4. The fully compressed refrigerant is discharged from the second discharge port to the first discharge port on the head cover 5. Finally, the gaseous refrigerant flows out from the first exhaust port, and the lubricating oil and a small amount of refrigerant carried by the refrigerant are collected in the oil storage cavity 203 and flow back to the back pressure cavity 401 through the flow passage, so that lubrication is provided for the scroll compressor structure. When the back pressure cavity 401 is too high in pressure to push the movable scroll 3 away from the support 2, and then the fixed scroll 4 is separated from the support 2, two ends of the hollow connecting piece can still be kept in the second drainage channel 301 and the third drainage channel 303, so that the whole and continuous circulation channel is ensured, lubricating oil and refrigerant can flow to the back pressure cavity 401, and the lubricating oil and refrigerant are prevented from leaking to the suction side from a gap between the fixed scroll 4 and the end face of the support 2, and further the performance of the compressor is influenced.

As the compressor operates, refrigerant and lubricating oil enter the back pressure chamber 401 from the passage, so that the back pressure Pd of the back pressure chamber 401 is continuously changed, and the compression chamber 200 communicating with the back pressure chamber 401 through the back pressure passage 304 is also changed according to the change in the relative positions of the fixed scroll 4 and the movable scroll 3. The pressure of the back pressure chamber 401 may be greater than the pressure of the compression chamber 200, and the back pressure passage 304 functions to regulate the pressure of the back pressure chamber 401 to discharge the excessive fluid out of the back pressure chamber 401, so that the pressure of the back pressure chamber 401 is maintained within a reasonable range.

As shown in fig. 1, a head cover 5 is placed and fixed at one end of the casing 1, and the fixed scroll 4 and the bracket 2 are pressed and fixed on the casing 1. The crankshaft 9 is inserted into the inside of the bracket 2 and sealed therebetween by a sealing member 17. The cavities between the casing 1 and the machine head cover 5 for placing the fixed scroll 4, the movable scroll 3 and the bracket 2 form a first suction cavity 101, and the pressure in the first suction cavity 101 is suction pressure Ps.

The fixed scroll 4 has a base plate 4a, and a wrap 4b is formed to extend to the orbiting scroll 3 along one side of the base plate 4 a. The orbiting scroll 3 has a base plate 3a, a wrap 3b is formed to extend along one side of the base plate 3a, the wrap 3b and the wrap 4b are engaged to form a plurality of compression chambers 200, and as the orbiting scroll 3 is rotated, the compression chambers 200 gradually move toward the center and the volume gradually decreases, so that gas is compressed. The space outside the spiral teeth 3b and the base plate 3a of the movable scroll 3 and inside the side wall of the fixed scroll 4 and the base plate 4a forms a second suction chamber 102.

The physical properties such as temperature, viscosity, density and the like of the lubricating oil in the oil storage cavity 203 and the refrigerant in the second suction cavity 102 are different, and if two mediums are mixed in the second suction cavity 102, the state of the refrigerant entering the compression cavity 200 is affected, so that the deviation occurs between the state of the refrigerant entering the compression cavity 200 and the preset state of the compressor in design, the performance of the compressor is affected, and the subsequent working process is further affected. While the connector of the present embodiment reduces leakage of lubricant to the second suction chamber 102, the above-described effects are reduced.

Preferably, the connector of the present embodiment is preferably a connector pin 14. The connecting pin 14 of the present embodiment is hollow and tubular, and has a simple structure and is easy to produce. As shown in fig. 2, the outlet of the second drainage channel 301 is provided on the end face of the side facing the bracket 2, and a pin hole 4f is provided at the outlet section. The inlet of the third drainage channel 303 is opened at a position corresponding to the outlet of the second drainage channel 301, and the inlet section of the third drainage channel 303 is provided with a pin hole 2c. The first end of the connecting pin 14 is inserted into the pin hole 4f, the second end of the connecting pin 14 is inserted into the pin hole 2c, and the second drainage channel 301 and the third drainage channel 303 are communicated by the flow hole 302 in the connecting pin 14.

Further preferably, as shown in fig. 2 and 3, the first end of the connecting pin 14 of the present embodiment is in interference fit with the pin hole 4f of the fixed scroll 4, and the second end is inserted into the pin hole 2c of the bracket 2 and is in clearance fit with the bracket 2, and the outer diameter d1 of the connecting pin 14 and the inner diameter d2 of the pin hole 2c satisfy d2-d1 less than or equal to 0.1mm, which is beneficial to sealing of the through-flow passage and prevents the leakage of lubricating oil into the second suction cavity 201.

Further, as shown in fig. 1 to 3, the scroll compressor of the present embodiment further includes a gasket 8, the gasket 8 being disposed between the orbiting scroll 3 and the bracket 2, and the connection member being penetrated in the gasket 8. The side of the support 2 facing the orbiting scroll 3 is a flat support surface 2b and the gasket 8 is preferably of wear resistant metal. As shown in fig. 4, the gasket 8 of the present embodiment may be formed in a circular plate-like or plate-like structure to avoid abrasion of the support surface 2b when the orbiting scroll 3 slides on the bracket 2.

The sheet-like or plate-like spacer 8 cooperates with the flat support surface 2b, and the spacer 8 and the bracket 2 can remain in abutment when the orbiting scroll 3 is away from the bracket 2.

Further, as shown in fig. 1 to 4, the bracket 2 of the present embodiment is further provided with a fastener 15, and the fastener 15 can pass through the spacer 8 to restrict the movement of the spacer 8 relative to the bracket 2. A plurality of pin holes 2a are uniformly distributed in the area of the supporting surface 2b, which is close to the axis, a plurality of through holes 8a are formed in the position of the gasket 8, which corresponds to the pin holes 2a, and a fastener 15 penetrates through the through holes 8a and is fastened in the pin holes 2a so as to limit the rotation or the movement of the gasket 8.

Preferably, the fastener 15 is a pin, and the pin can be matched with a cylindrical slot hole on the movable scroll 3 while fixing the gasket 8, so as to prevent the movable scroll 3 from rotating.

Specifically, as shown in fig. 1, the fastener 15 of the present embodiment includes a large diameter section 15b and a small diameter section 15a, the small diameter section 15a being fastened in the pin hole 2a, the large diameter section 15b having a diameter larger than that of the through hole 8a, a stepped surface being formed between the large diameter section 15b and the small diameter section 15a, the fastener 15 abutting the washer 8 on the bracket 2 through the stepped surface. When the orbiting scroll 3 moves away from the bracket 2 under the pressure difference, the gasket 8 remains in abutment with the support surface 2 b. Preferably, the small diameter section 15a is interference fit with the pin bore 2a to achieve tightening. Alternatively, the small diameter section 15a and the pin bore 2a may also be fastened by a threaded structure.

Further, as shown in fig. 1, the orbiting scroll 3 of the present embodiment further includes an end surface 3c facing the bracket and a receiving groove 3d provided on the end surface 3c, a floating seal ring 11 is provided in the receiving groove 3d, and the floating seal ring 11 is used to seal the back pressure chamber 401.

As shown in fig. 5, the floating seal ring 11 includes a seal ring and an elastic member 10, and the elastic member 10 can prop open the seal ring 7 to make the seal ring 7 always fit with the gasket 8, so that the floating seal ring 11 can slide on the surface of the gasket 8 together with the orbiting scroll 3 and always contact with the surface of the gasket 8, so as to realize sealing between the orbiting scroll 3 and the gasket 8. Preferably, the annular receiving groove 3d has a cross-sectional width slightly larger than the width of the seal ring 7. The gas in the back pressure cavity 401 can enter the gap between the accommodating groove 3d and the sealing ring 7, so that the pressure of the sealing ring 7 in the radial direction is the same everywhere, and the stability of the bonding with the side wall of the accommodating groove 3d is ensured. The seal ring 7 is typically made of a material with low friction coefficient, such as PTFE (polytetrafluoroethylene).

In other embodiments, floating seal ring 11 may also use a seal ring of the configuration of fig. 6 or other configurations to achieve a sealing effect. As shown in fig. 6, the elastic member 10 of the floating seal ring 11 of this embodiment is disposed in the seal ring 7 to support the lip portion of the seal ring 7, and the inner surface of the lip portion of the seal ring 7, which cooperates with the elastic member 10, is disposed obliquely, so that the elastic member 10 provides a radially outward force to the seal ring 7 while supporting the seal ring 7, so that the seal ring 7 is abutted against the side wall of the accommodating groove 3 d.

Further, as shown in fig. 1, a throttle structure is disposed in the second drainage channel 301 of the present embodiment. The throttle structure reduces the flow-through area in the second drainage channel 301, reduces the speed of the return flow of the lubricating oil into the back pressure chamber 401, and reduces the amount of the return flow oil. The problems that excessive oil return causes excessive lubrication oil to enter the compression cavity 200 through the back pressure channel 304, so that the pressure of the compression cavity 200 is increased and the compression power consumption of the compressor is increased are avoided.

Preferably, as shown in fig. 1, the throttle structure of the present embodiment is a throttle screw 13. The throttle screw 13 may be selected as a standard hexagon flat end set screw, and the throttle is realized by means of a small gap between the internal and external threads. In other embodiments the throttle structure is not limited to the form of a throttle screw.

In this embodiment, as shown in fig. 1, a boss 4c is formed on the other side of the base plate 4a of the fixed scroll 4 in an extending manner, a groove 4d is provided on the boss 4c, a rubber seal ring 6 is placed in the groove 4d, and the cover 5 and the boss 4c clamp the rubber seal ring 6 to form a sealing area, so that an exhaust cavity 201 inside the boss 4c is isolated from a third exhaust cavity 103 outside the boss 4 c. The camera cover 5 is provided with an exhaust passage 202 which is communicated with the first exhaust port and the exhaust cavity 201, and the bottom of the exhaust passage 202 is an oil storage part 203.

During operation of the compressor, refrigerant first enters the first suction chamber 101 of the compressor housing 1 and then enters the second suction chamber 102 through the second suction port of the non-orbiting scroll 4. The refrigerant is compressed in the compression chamber 200 and moved toward the center, then discharged into the discharge chamber 201 through the second discharge port of the fixed scroll 4, and finally discharged out of the compressor through the discharge passage 202 on the head cover 5. In the exhaust channel 202, when the refrigerant enters the exhaust channel 202 to rotate and strike the pipe wall, the carried lubricating oil is separated, and the lubricating oil gathers in the oil storage area 203 at the bottom along the pipe wall under the action of gravity, so that the gaseous refrigerant is separated from the liquid lubricating oil. The lubricating oil and the mixed refrigerant in the exhaust pressure state enter the first drainage channel and the second drainage channel 301 from the oil storage area 203, after the inlet section of the second drainage channel 301 is throttled by the throttling screw 13, the lubricating oil and the mixed refrigerant finally enter the back pressure cavity 401 through the flow holes 302 and the third drainage channel 303, and the bearing 12 and the moving parts in the back pressure cavity 401 are lubricated.

Embodiment two:

as shown in fig. 7 to 10, the scroll compressor of the second embodiment is different from the scroll compressor of the first embodiment in that: the structure of the

pin holes

4f and 2c, which are engaged with the connecting pin 14, and the throttle structure.

Specifically, as shown in fig. 7 and 8, the second end of the connecting pin 14 of the second embodiment is interference fit with the pin hole 2c of the bracket 2, the first end is inserted into the pin hole 4f of the fixed scroll 4 and is clearance fit with the fixed scroll 4, the outer diameter d1 of the connecting pin 14 and the inner diameter d3 of the pin hole 4f satisfy d3-d1 ∈0.1mm, and when the fixed scroll 4 is separated from the bracket 2, although lubricating oil and refrigerant may leak out from the gap between the connecting pin 14 and the pin hole 4f, the connecting pin 14 reduces the leakage area, and the amount of oil leaked into the second suction chamber 201 can be reduced.

In the prior art, when the pressure in the back pressure chamber 401 is large, the movable scroll 3 pushes the fixed scroll 4 away from the supporting surface 2b of the support 2, so that a large leakage gap exists between the outlet of the first drainage channel 301 and the inlet of the second drainage channel 303, and thus high-pressure fluid in the drainage channel leaks to the suction side, resulting in performance degradation. In this patent, the high pressure fluid in the drainage channel first passes through the small gap between the connecting pin 14 and the

pin hole

4f or 2c before entering the suction side. The micro clearance can be controlled by the fit clearance of the parts, typically by setting the outer diameter d1=3.5 mm of the connecting pin, the clearance d 2-d1=0.02 mm of the pin hole and pin, the proportion of the refrigerant leaking from the clearance accounting for the mass flow of the compressor is shown in fig. 11, for R410A refrigerant, the displacement is 18cm ³ A compressor with a speed of 3600rpm will have a leakage rate of less than 1% under typical refrigeration and heating conditions. The leakage is small and therefore does not have an impact on the compressor performance.

As shown in fig. 9 and 10, the throttle screw in the first embodiment is replaced with the throttle pin 16 in the throttle structure of the present embodiment, the throttle pin 16 includes a head portion 16c and a stem portion 16a, the head portion 16c is in contact with the inner wall of the second drainage channel 301 or the third drainage channel 303, the diameter of the stem portion 16a is smaller than the inner diameter of the second drainage channel 301, and a communication portion is provided on the head portion 16 c. A portion of the head portion 16c of the cylinder is cut off to form a communicating portion so that lubricating oil and refrigerant enter the second drainage passage 301 from the communicating portion, and the stem portion 16a reduces the flow passage area in the second drainage passage 301, thereby achieving a throttling effect.

Further, the throttle pin 16 further includes a connecting portion 16b connected to the head portion 16c and the stem portion 16a, the diameter of the connecting portion 16b being smaller than the diameter of the stem portion 16 a. The connection portion 16b has a liquid-equalizing effect, and causes the lubricant and the refrigerant passing through the communication portion to flow from the circumferential direction of the throttle pin 16 to the back pressure chamber 401.

Preferably, the head 16c of the present embodiment is an interference fit with the second drain channel 301 to secure the throttle pin 16 in the second drain channel 301.

In other embodiments, the throttle pin 16 or the throttle screw may be provided in the third drain passage 303, or the throttle pin 16 or the throttle screw may be provided in both the second drain passage 301 and the third drain passage 303. Correspondingly, the head 16c of the throttle pin 16 is interference fit with the respective second and/or

third drain channel

301, 303.

Embodiment III:

as shown in fig. 12 and 13, the scroll compressor of the third embodiment eliminates the gasket structure and replaces the pin having the stepped surface of the second embodiment with the cylindrical pin, as compared with the embodiment.

In this embodiment, the floating seal 11 is in direct contact with the support surface 2b of the bracket to effect sealing.

Embodiment four:

as shown in fig. 14, in comparison with the first embodiment, the scroll compressor of the fourth embodiment disposes the throttle screw 13 in the third drain passage 303 to achieve throttling.

The present application also provides an air conditioner (not shown in the drawings) according to the present embodiment, which includes a compressor, and the compressor is the scroll compressor of any one of the above embodiments. The air conditioner has the advantages of long service life, good performance and stable power consumption.

Further, the air conditioner of the present embodiment is a vehicle-mounted air conditioner.

From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

refrigerant enters the housing from the first suction port and flows into the compression chamber between the fixed scroll and the orbiting scroll from the second suction port. The refrigerant compressed to a certain extent enters the back pressure chamber from the compression chamber through the back pressure passage to provide a force against the fixed scroll to the orbiting scroll. The fully compressed refrigerant is discharged from the second discharge port to the first discharge port on the head cover. And finally, the gaseous refrigerant flows out of the first exhaust port, and the lubricating oil and a small amount of refrigerant carried by the refrigerant are collected into the oil storage cavity and flow back into the back pressure cavity through the flow passage, so that lubrication is provided for the scroll compressor structure. When the back pressure cavity pressure is too large to push the movable scroll away from the support, and then the fixed scroll is separated from the support, two ends of the hollow connecting piece still can be kept to be positioned in the second drainage channel and the third drainage channel, so that the whole continuity of the circulation channel is ensured, lubricating oil and refrigerant can flow to the back pressure cavity, the lubricating oil and the refrigerant are prevented from leaking to the air suction side from a gap between the fixed scroll and the end face of the support, and the performance of the compressor is further influenced.

In the description of the present application, it should be understood that, where azimuth terms such as "front, rear, upper, lower, left, right", "transverse, vertical, horizontal", and "top, bottom", etc., indicate azimuth or positional relationships generally based on those shown in the drawings, only for convenience of description and simplification of the description, these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are merely for convenience of distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and thus should not be construed as limiting the scope of the present application.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A scroll compressor, comprising:

the device comprises a shell, wherein the shell comprises a shell (1) and a machine head cover (5) connected with the shell (1), a first air suction port is arranged on the shell (1), and a first air exhaust port and an oil storage cavity (203) communicated with the first air exhaust port are arranged on the machine head cover (5);

a fixed scroll (4) and an movable scroll (3) which are arranged in the shell (1), wherein a second air suction port (4 e) communicated with the first air suction port and a second air discharge port communicated with the first air discharge port are arranged on the fixed scroll (4);

a bracket (2) arranged on one side of the movable scroll (3) facing the first air suction port;

the scroll compressor further comprises a flow passage which is communicated with a back pressure cavity (401) and the oil storage cavity (203) of the scroll compressor, wherein the flow passage comprises a first drainage channel arranged in the machine head cover (5), a second drainage channel (301) arranged on the fixed scroll (4) and a third drainage channel (303) which is communicated with the second drainage channel (301) and the back pressure cavity (401);

a connecting piece is further arranged in the overflow passage, a first end of the connecting piece is arranged in the second drainage channel (301), a second end of the connecting piece is arranged in the third drainage channel (303), and the connecting piece is of a hollow structure;

the connecting piece is a connecting pin (14), a first end of the connecting pin (14) is in interference fit with the fixed scroll (4), a second end of the connecting pin (14) is in clearance fit with the bracket, or the first end of the connecting pin (14) is in clearance fit with the fixed scroll (4), and a second end of the connecting pin (14) is in interference fit with the bracket (2);

a compression cavity (200) is formed between the fixed scroll (4) and the movable scroll (3), and a back pressure channel (304) which is communicated with the compression cavity (200) and the back pressure cavity (401) is arranged on the movable scroll (3).

2. A scroll compressor according to claim 1, further comprising a gasket (8), said gasket (8) being arranged between said orbiting scroll (3) and said bracket (2), said connection being provided through said gasket (8).

3. A scroll compressor according to claim 2, wherein the bracket (2) is further provided with a fastener (15), the fastener (15) being able to pass through the gasket (8) to limit movement of the gasket (8) relative to the bracket (2).

4. A scroll compressor according to claim 3, wherein the fastener (15) comprises a large diameter section and a small diameter section, a stepped surface being formed between the large diameter section and the small diameter section, the fastener (15) abutting the gasket (8) against the bracket (2) through the stepped surface.

5. A scroll compressor according to claim 1, wherein the orbiting scroll (3) comprises an end surface (3 c) facing the bracket and a receiving groove (3 d) provided on the end surface (3 c), a floating seal ring (11) being provided in the receiving groove (3 d), the floating seal ring (11) being for sealing the back pressure chamber (401).

6. The scroll compressor according to claim 1, wherein a throttle structure is provided in at least one of the second (301) and third (303) drain channels.

7. The scroll compressor according to claim 6, wherein the throttle structure is a throttle pin (16), the throttle pin (16) includes a head portion (16 c) and a stem portion (16 a), the head portion (16 c) is in contact with an inner wall of the second drainage channel (301) or the third drainage channel (303), a diameter of the stem portion (16 a) is smaller than an inner diameter of the second drainage channel (301) or the third drainage channel (303), and a communication portion is provided on the head portion (16 c).

8. The scroll compressor of claim 7, wherein the throttle pin (16) further includes a connecting portion (16 b) connected between the head portion (16 c) and the rod portion (16 a), the connecting portion (16 b) having a diameter smaller than a diameter of the rod portion (16 a).

9. The scroll compressor of claim 7, wherein the head (16 c) is an interference fit with the second (301) and/or third (303) drain channels.

10. A scroll compressor according to claim 6, wherein the throttle structure is a throttle screw (13).

11. An air conditioner comprising a compressor, wherein the compressor is the scroll compressor according to any one of claims 1 to 10.

12. The air conditioner of claim 11, wherein the air conditioner is a vehicle-mounted air conditioner.