CN108050060B

CN108050060B - Scroll compressor

Info

Publication number: CN108050060B
Application number: CN201711000542.9A
Authority: CN
Inventors: 李海港; 郭求和; 曹贞文; 李立民; 余世顺
Original assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Current assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Priority date: 2017-10-24
Filing date: 2017-10-24
Publication date: 2024-03-08
Anticipated expiration: 2037-10-24
Also published as: CN108050060A

Abstract

The invention relates to a scroll compressor, comprising: a compression assembly for compressing a fluid, including an orbiting scroll; a support portion for supporting the movable scroll; a discharge chamber into which the fluid compressed by the compression assembly is discharged; and the first fluid passage can guide the fluid in the exhaust cavity to flow into the space between the supporting part and the matching surface of the movable scroll so as to reduce the friction force between the movable scroll and the supporting part. The invention can reduce the friction force of the movable vortex plate on the supporting part, is beneficial to reducing the working abrasion of the movable vortex plate and the supporting part, improves the structural reliability of the vortex compressor, prolongs the service life of the compressor, and can send the lubricating oil deposited in the high-pressure exhaust cavity back to the suction cavity of the compressor when the compressor is stopped, thereby improving the recycling efficiency of the lubricating oil.

Description

Scroll compressor

Technical Field

The invention relates to the technical field of compressors, in particular to a scroll compressor.

Background

The vortex compressor has the advantages of simple structure, small volume, light weight, low noise, high mechanical efficiency, stable operation and the like. For the scroll compressor at the low pressure side, a refrigerant containing a certain oil quantity is compressed by the movable scroll and then enters a high-pressure exhaust cavity formed by the upper cover assembly and the partition plate, and is discharged through the exhaust pipe. Because the refrigerant fills the whole exhaust cavity, lubricating oil in the refrigerant adheres to the inner wall of the upper cover and the partition plate, and finally a certain amount of lubricating oil can remain in the exhaust cavity, and as time is accumulated, the lubricating oil on the partition plate can be increased, so that the oil quantity of the internal reference and circulating lubrication of the compressor is reduced, and the performance of the compressor is affected.

In addition, for the low pressure side scroll compressor that moves the vortex dish unsteady, during normal operating, its moves vortex dish and is pressed by the gas force on the upper bracket holding surface, moves vortex dish and rotate around the bent axle center, then moves and will produce the friction between vortex dish and the upper bracket, and the relative friction produces high temperature, and the high temperature then reduces the viscosity of lubricating oil, weakens lubricated effect. The contact surface between the movable vortex plate and the upper bracket will be worn along with the time, the friction power consumption generated by the friction pair is gradually increased, the energy efficiency of the compressor is reduced if the friction power consumption is light, and the damage of other parts in the compressor is caused along with the aggravation of the wear of the movable vortex plate and the upper bracket, thereby influencing the reliability and the service life of the compressor.

Disclosure of Invention

In order to solve the above problems in the prior art, the present invention provides a scroll compressor, which aims to reduce the rotation abrasion of a movable scroll and ensure the reliability of the compressor.

The technical scheme adopted by the invention is as follows:

according to one aspect of the present invention, there is provided a scroll compressor comprising:

a compression assembly for compressing a fluid, including an orbiting scroll;

a support portion for supporting the movable scroll;

A discharge chamber into which the fluid compressed by the compression assembly is discharged;

and the first fluid passage can guide the fluid in the exhaust cavity to flow into the space between the supporting part and the matching surface of the movable scroll so as to reduce the friction force between the movable scroll and the supporting part.

Preferably, the first fluid passage includes:

a first end in communication with the exhaust chamber;

and a second end for introducing fluid in the first fluid passage between the support and the mating surface of the orbiting scroll.

Preferably, the support part includes a support plate having a first wall surface opposite to the orbiting scroll;

a first groove is formed in the first wall surface and communicated with the second end, so that fluid in the exhaust cavity can flow into the first groove; and/or the number of the groups of groups,

the movable vortex plate is provided with an oil distribution groove on the wall surface opposite to the first wall surface, the oil distribution groove is communicated with the second end, and fluid in the exhaust cavity can flow into the oil distribution groove.

Preferably, the first groove is an annular groove, and the fluid entering the annular groove can be uniformly distributed in the annular groove.

Preferably, the first wall surface is further provided with:

the second groove is internally provided with a second sealing structure;

the third groove is internally provided with a third sealing structure;

the second sealing structure and the third sealing structure can enclose a sealed back pressure cavity with the supporting plate and the movable vortex plate, and the first groove is positioned in the back pressure cavity.

Preferably, the second groove and the third groove are annular grooves which are concentrically arranged;

when the first groove is an annular groove, the first groove, the second groove and the third groove are all concentrically arranged, and the diameter of the first groove is larger than that of the second groove but smaller than that of the third groove.

Preferably, the second sealing structure comprises a second sealing ring arranged in the second groove, and a second elastic structure is further arranged between the second sealing ring and the bottom of the second groove;

the third sealing structure comprises a third sealing ring arranged in the third groove, and a third elastic structure is further arranged between the third sealing ring and the bottom of the third groove.

Preferably, when the scroll compressor is operated, the force applied by the fluid in the back pressure chamber to the movable scroll in a direction away from the support plate is smaller than the force applied to the movable scroll toward the support plate.

Preferably, the first end is in communication with a bottom of the exhaust chamber in the direction of gravity.

Preferably, the first fluid passage includes an oil return pipe and a through hole structure provided in the support portion;

the oil return pipe is communicated with the exhaust cavity and the through hole structure, and the through hole structure can introduce fluid in the oil return pipe between the matching surfaces of the movable scroll and the supporting plate.

Preferably, the oil return pipe is at least partially disposed outside the housing of the scroll compressor.

Preferably, the oil return pipe comprises a joint, a straight pipe section and a U-shaped pipe section which are sequentially connected, wherein the joint is used for being connected with the through hole structure, and the U-shaped pipe section is arranged outside the shell of the scroll compressor.

Preferably, a joint sealing ring is arranged at the outer wall of the joint;

the via structure includes an interface;

the connector can be inserted into the interface and is in sealing connection with the interface.

Preferably, the oil return pipe is provided inside the housing of the scroll compressor.

Preferably, the support part is detachably provided with a first connecting piece, and the first connecting piece is used for communicating the oil return pipe and the through hole structure.

Preferably, a first channel and a second channel which are communicated with each other are arranged in the first connecting piece, and the first channel is communicated with the through hole structure;

the oil return pipe comprises a joint, and a joint sealing ring is arranged at the outer wall of the joint;

the connector is inserted into the second channel and is connected with the second channel in a sealing way.

Preferably, the scroll compressor further comprises a separation plate arranged between the exhaust cavity and the compression assembly, and an oil return hole is arranged on the separation plate;

the partition plate is detachably provided with a second connecting piece, and the second connecting piece can be communicated with the oil return pipe and the oil return hole.

Preferably, the scroll compressor further comprises:

a suction chamber for containing a fluid to be compressed;

a second fluid passage capable of directing fluid between the support and the mating surface of the orbiting scroll into the suction chamber when the scroll compressor is shut down.

Preferably, the second fluid path comprises:

the oil return inlet end is arranged between the supporting part and the matching surface of the movable vortex plate;

the oil return outlet end is provided with an oil return valve communicated with the air suction cavity;

When the scroll compressor is stopped, the oil return valve can communicate the oil return outlet end with the air suction cavity, so that fluid in the second fluid passage can flow into the air suction cavity; the oil return valve is capable of sealing the oil return outlet end when the scroll compressor is in operation.

Preferably, the oil return valve includes:

the valve casing is provided with a first opening communicated with the oil return outlet end and an oil outlet communicated with the air suction cavity;

the valve core is arranged in the valve shell; when the scroll compressor is stopped, the valve core can be communicated with the first opening and the oil outlet hole, so that fluid in the second fluid passage can flow into the air suction cavity from the oil outlet hole; the valve spool is capable of closing the oil outlet hole when the scroll compressor is operated.

Preferably, the valve housing is further provided with a second opening communicated with the suction cavity; the valve core can change positions according to the fluid pressure at the first opening and the fluid pressure at the second opening so as to open or close the oil outlet.

Preferably, the oil return valve further comprises an elastic piece, wherein the elastic piece is arranged in the valve shell and is abutted against one side, close to the second opening, of the valve core;

When the scroll compressor runs, the fluid pressure at the first opening is larger than the fluid pressure at the second opening, the valve core presses the elastic piece and is positioned at a first position, and the side wall of the valve core blocks the oil outlet;

when the scroll compressor is stopped, the fluid pressure at the first opening is not greater than the fluid pressure at the second opening, and under the elastic restoring action of the elastic piece, the valve core is positioned at the second position and is communicated with the first opening and the oil outlet.

Preferably, when the support part comprises the support plate, and the first groove is formed at the first wall surface of the support plate, the oil return inlet end is communicated with the first groove.

Preferably, the scroll compressor is a low pressure side scroll compressor and the fluid includes a heat exchange medium and/or lubricating oil.

The invention has the beneficial effects that:

1. the high-pressure heat exchange medium and/or lubricating oil in the exhaust cavity can be introduced between the supporting part and the movable scroll, so that the axial pressure of the movable scroll to the supporting part is reduced, and the friction coefficient between the movable scroll and the supporting part is reduced, thereby reducing the friction force between the movable scroll and the supporting part, being beneficial to reducing the structural abrasion of the movable scroll and the supporting part, improving the reliability and the stability of the scroll compressor and effectively prolonging the service life of the compressor;

2. When the compressor is stopped, the lubricating oil deposited in the high-pressure exhaust cavity is sent back to the suction cavity of the compressor, so that the recycling efficiency of the lubricating oil is improved, and the problem of performance reduction of the compressor caused by insufficient lubrication is avoided.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of a scroll compressor according to the present invention;

FIG. 2 is a schematic view of a partial construction of an embodiment of a scroll compressor according to the present invention;

FIG. 3 is a schematic view of an embodiment of a support plate according to the present invention;

FIG. 4 is a schematic view of the assembly of the support plate, upper bracket and oil return valve of the present invention;

FIG. 5 is a schematic cross-sectional view of the assembly of the support plate, upper bracket and return valve of the present invention;

FIG. 6 is a schematic cross-sectional view of the oil return valve of the present invention at the time of compressor shutdown;

FIG. 7 is a schematic cross-sectional view of the oil return valve of the present invention when the compressor is running;

FIG. 8 is a schematic view of an embodiment of a support plate according to the present invention;

FIG. 9 is a schematic view of an embodiment of the oil return pipe according to the present invention;

FIG. 10 is an enlarged view of a partial structure of another embodiment of the scroll compressor according to the present invention;

FIG. 11 is a schematic view of the structure of the first connector according to the present invention;

FIG. 12 is a schematic view of an embodiment of the oil return pipe according to the present invention;

in the figure: 1. an upper cover; 2. a partition plate; 2a, oil return holes; 3. an upper housing; 4. a cross slip ring; 5. a support plate; 5a, a first groove; 5b, a first axial hole; 5c, a first radial hole; 5d, an interface; 5e, a third groove; 5f, a second groove; 5g, second axial hole; 5h, a second radial hole; 5i, a third axial hole; 6. an upper bracket; 6b, a fourth axial hole; 6c, radial threaded holes; 7. a motor; 8. a motor fixing frame; 9. a lower housing; 10. a lower support ring; 11. a lower cover; 12. a lower bracket; 13. a lower bearing; 14. a crankshaft; 15. a rotor; 16. an eccentric sleeve; 17. an orbiting scroll; 18. a fixed scroll; 19. sealing cover; 20. an exhaust pipe; 21. a check valve; 23. a third seal ring; 24. a third elastic structure; 25. a second seal ring; 26. a second elastic structure; 27. a joint; 28. a joint seal ring; 29. a straight pipe section; 30. a first fluid passageway; 31. a first connector; 31a, a first channel; 31b, a second channel; 32. a U-shaped tube section; 33. a second connector; 34. a valve housing; 34a, a first opening; 34b, a second opening; 34c, oil outlet holes; 35. a valve core; 35a, a first oil leakage pipeline; 35b, a second oil leakage pipeline; 35c, a ring groove; 36. a first elastic structure; 38a, a first valve core sealing ring; 38b, a second valve core sealing ring; 38c, a third valve core sealing ring; 39. an oil return valve; 50. a second fluid passageway; 60. a support part; 0. an oil pool; 100. an exhaust chamber; 200. an air suction cavity; 300. and an oil return pipe.

Detailed Description

In order to further describe the technical means and effects adopted by the present invention for achieving the intended purpose, the following detailed description refers to the specific implementation, structure, characteristics and effects according to the present invention application with reference to the accompanying drawings and preferred embodiments. In the following description, particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

It should be noted that, in the description of the present invention, terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "axial", "radial", and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

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

As shown in fig. 1, the present invention provides a scroll compressor including:

a compression assembly for compressing a fluid, including an orbiting scroll 17;

a support portion 60 for supporting the movable scroll 17;

a discharge chamber 100 into which the fluid compressed by the compression assembly is discharged into the discharge chamber 100;

the first fluid passage 30 can guide the fluid in the exhaust chamber 100 to flow between the mating surfaces of the support portion 60 and the movable scroll 17, so as to reduce the friction between the movable scroll 17 and the support portion 60.

During operation of the compressor, the friction between the orbiting scroll 17 and the support portion 60 is mainly related to two factors, namely, the axial pressure of the orbiting scroll 17 against the support portion 60 and the friction coefficient therebetween. The provision of the first fluid passage 30 can reduce both the axial pressure of the orbiting scroll 17 against the support portion 60 and the coefficient of friction therebetween. Specifically, the fluid discharged into the exhaust chamber 100 after being compressed by the compression assembly is mostly an oil-containing high-pressure heat exchange medium, and the first fluid passage 30 is configured to introduce the high-pressure heat exchange medium and/or lubricating oil between the supporting portion 60 and the mating surface of the movable scroll 17, where the high-pressure heat exchange medium can increase the pressure on the back side (opposite to the supporting portion 60) of the movable scroll 17 or directly acts on the movable scroll 17, and apply a force to the movable scroll 17 in a direction away from the supporting portion 60, so as to reduce the axial pressure of the movable scroll 17 on the supporting portion 60, and achieve the purpose of reducing the friction force between the two; lubricating oil in the exhaust chamber 100 can also enter between the movable scroll 17 and the supporting portion 60, and the friction coefficient between the movable scroll 17 and the supporting portion is reduced, so that the friction force between the movable scroll and the supporting portion is further reduced; the reduction of friction between the movable scroll 17 and the supporting portion 60 is also beneficial to reducing the temperature rise of the contact surface of the movable scroll 17 and the supporting portion 60 caused by friction, preventing the lubricating oil from losing efficacy due to the reduction of viscosity at high temperature, forming a virtuous circle, being beneficial to reducing the abrasion of the movable scroll 17 and the supporting portion 60, improving the reliability of the structure of the scroll compressor and prolonging the service life of the compressor. It should be noted that, in the present invention, the axial direction refers to the axial direction of the orbiting scroll 17 or the supporting portion 60 (as shown in fig. 1, the axial directions are the same), that is, the vertical direction as shown in fig. 1; the radial direction in the present invention means the radial direction of the orbiting scroll 17 or the supporting portion 60.

As a preferred embodiment, the first fluid passage 30 includes: a first end in communication with the exhaust chamber 100; and a second end disposed between the mating surfaces of the support portion 60 and the orbiting scroll 17 for introducing fluid in the first fluid passage 30 therebetween. During operation of the compressor, the pressure at the first end is the same as the pressure in the discharge chamber 100, and the pressure at the second end is generally less than the pressure at the first end, so that fluid within the discharge chamber 100 can flow between the support portion 60 and the orbiting scroll 17, acting to reduce friction between the orbiting scroll 17 and the support portion 60.

As a preferred embodiment, the support part 60 includes a support plate 5, and the support plate 5 has a first wall surface opposite to the movable scroll 17, as shown in fig. 1 and 2, the first wall surface contacts with a back side wall surface of the movable scroll 17, and a first groove 5a is provided at the first wall surface, and the first groove 5a communicates with the second end, so that fluid in the exhaust chamber 100 can flow into the first groove 5a. In addition, an oil distribution groove may be further formed in a wall surface of the movable scroll 17 opposite to the first wall surface, the oil distribution groove is in communication with the second end, and fluid in the exhaust chamber 100 may flow into the oil distribution groove. The first groove 5a and/or the oil distribution groove form a space capable of containing fluid on the back side of the movable scroll 17, and the space enables the fluid to have a larger effective acting area on the movable scroll 17, which is beneficial to increasing the back pressure of the movable scroll 17, so that the acting force of the fluid on the movable scroll 17 is increased, and the pressure of the movable scroll 17 on the supporting plate 5 is promoted to be reduced. Moreover, by changing the shape, position and size of the first grooves 5a and/or the oil distribution grooves, the distribution and size of the force of the fluid on the movable scroll 17 can be changed, thereby controlling the frictional force between the movable scroll 17 and the support plate 5.

As a preferred embodiment, the first groove 5a is an annular groove, and the fluid entering the annular groove can be uniformly distributed in the annular groove, which is beneficial to uniformly acting the fluid acting force on the movable scroll 17. As shown in fig. 3, preferably, the center of the first groove 5a is located on the central axis of the support plate 5, and the force of the fluid entering the annular groove on the movable scroll 17 can be uniformly distributed on the back side of the movable scroll 17 in the area opposite to the annular groove, so that the pressure of the movable scroll 17 on the support plate 5 can be reduced by an equal amount.

As a preferred embodiment, the first wall surface is further provided with: a second groove 5f, wherein a second sealing structure is arranged in the second groove 5 f; a third groove 5e, wherein a third sealing structure is arranged in the third groove 5 e; the second sealing structure and the third sealing structure can enclose a sealed back pressure cavity with the supporting plate 5 and the movable scroll 17, and the first groove 5a is positioned in the back pressure cavity.

Therefore, the back pressure cavity arranged in a sealing way is used for containing the fluid flowing into the first groove 5a, so that the pressure of the fluid on the back side of the movable scroll 17 is improved, the axial acting force of the fluid on the movable scroll 17 is increased, the friction force between the movable scroll 17 and the supporting plate 5 is reduced, in addition, the back pressure cavity arranged in a sealing way can prevent the leakage of high-pressure fluid to the low-pressure cavity inside the compressor, the compression efficiency of the scroll compressor is improved, and the unnecessary energy consumption is reduced. The force of the fluid in the back pressure chamber on the movable scroll 17 away from the support plate 5 can be expressed by the formula F ₁ P·s, where P is the back pressure in the back pressure chamber; s is the effective area of action of the fluid on the orbiting scroll 17.

As a preferred embodiment, as shown in fig. 3, the second groove 5f and the third groove 5e are concentric annular grooves; when the first groove 5a is an annular groove, the first groove 5a, the second groove 5f and the third groove 5e are all concentrically arranged, and the diameter of the first groove 5a is larger than that of the second groove 5f but smaller than that of the third groove 5 e.

The second groove 5f and the third groove 5e are concentrically arranged, and the diameter d of the second groove 5f ₂ Smaller than the diameter d of the third groove 5e ₃ Thus, the second seal in the second recess 5f and the third seal in the third recess 5e form an annular back on the back side of the orbiting scroll 17A pressure chamber sandwiched between the second groove 5f and the third groove 5e, the diameter of the first groove 5a being d ₁ Wherein d is ₂ ＜d ₁ ＜d ₃ The fluid entering the first groove 5a fills and is sealed in the annular back pressure cavity, so that a uniform acting force in a direction away from the support plate 5 can be provided for the movable scroll 17, and meanwhile, the back pressure cavity arranged in an annular shape is beneficial to conveniently calculating the effective acting area of the fluid on the movable scroll 17, namely S= (d) ₃ ² -d ₂ ² ) Pi/4, thereby obtaining an effective force of the fluid on the orbiting scroll 17 (i.e. force F in a direction away from the support plate 5 ₁ )F ₁ ＝P·S＝P(d ₃ ² -d ₂ ² )π/4。

As a preferred embodiment, as shown in fig. 4, the second sealing structure includes a second sealing ring 25 disposed in the second groove 5f, and a second elastic structure 26 is further disposed between the second sealing ring 25 and the bottom of the second groove 5 f; the third sealing structure comprises a third sealing ring 23 arranged in the third groove 5e, and a third elastic structure 24 is further arranged between the third sealing ring 23 and the bottom of the third groove 5 e. The shape and the size of the second sealing ring 25 and the second elastic structure 26 are matched with those of the second groove 5f, the shape and the size of the third sealing ring 23 and the third elastic structure 24 are matched with those of the third groove 5e, the second elastic structure 26 and the third elastic structure 24 are preferably wave springs, the wave springs are arranged between the sealing ring and the bottom of the groove, the sealing ring can be jacked up, the elastic performance of the sealing ring is increased, and therefore the sealing performance of the second sealing structure and the third sealing structure is further improved, the formed back pressure cavity is sealed well, and fluid with higher pressure in the back pressure cavity is prevented from leaking. It should be noted that, the second elastic structure 26 has a limited height for lifting the second sealing ring 25, so that the second sealing ring 25 is still installed in the second groove 5f, and the sealing performance of the second sealing ring 25 is not damaged, or a problem of air leakage between the second sealing ring 25 and the second groove 5f is not caused. Similarly, the third elastic structure 24 does not impair the sealing performance of the third seal ring 23.

As a preferred embodiment, when the scroll compressor is operated, the force applied by the fluid in the back pressure chamber to the movable scroll 17 in a direction away from the support plate 5 (for convenience of description, denoted as F ₁ ) Not more than the force applied to the movable scroll 17 toward the support plate 5 (for convenience of description, denoted as F ₂ ). Acting force F ₂ Mainly comprises the pressure f of the gas in the compression cavity of the compressor to the movable vortex plate 17 ₁ Self gravity f of the movable scroll 17 ₂ Wherein f ₁ Referring to the force applied to the movable scroll 17 by the high pressure gas in the compression chamber of the compression assembly in the direction of the support plate 5 when the compressor is operated; acting force F ₁ Can be calculated according to the aforementioned calculation method (F ₁ =p·s). During the design and use process, keep F ₁ Not greater than F ₂ Preferably F ₁ Less than F ₂ The floating of the movable scroll 17 in the axial direction can be prevented, so that the axial acting force of the movable scroll 17 on the supporting plate 5 can be reduced on the premise of ensuring the normal operation of the compressor, and the frictional wear between the movable scroll 17 and the supporting plate can be reduced.

As a preferred embodiment, as shown in fig. 1 and 10, the first end is in communication with the bottom of the exhaust chamber 100 along the gravity direction. Due to the action of gravity, the lubricating oil entering the exhaust cavity 100 along with the high-pressure refrigerant is easy to accumulate at the bottom of the exhaust cavity 100, and the first end is arranged at the bottom of the exhaust cavity 100, so that more lubricating oil entering the exhaust cavity 100 is introduced between the matching surfaces of the movable scroll 17 and the supporting plate 5, the contact surfaces between the movable scroll 17 and the supporting plate 5 can be lubricated by the lubricating oil, the friction coefficient of the movable scroll 17 and the supporting plate 5 is reduced, the abrasion of the movable scroll 17 and the supporting plate 5 is reduced, the further collection of the lubricating oil in the exhaust cavity 100 is facilitated, and the subsequent oil return treatment is facilitated.

As a preferred embodiment, the first fluid passage 30 includes an oil return pipe 300 and a through hole structure provided in the support part 60; the oil return pipe 300 communicates the exhaust chamber 100 with the through hole structure, and the through hole structure can introduce the fluid in the oil return pipe 300 between the matching surfaces of the movable scroll 17 and the support plate 5.

As shown in fig. 1, as a preferred embodiment, the oil return pipe 300 is at least partially disposed outside the housing of the scroll compressor. Specifically, the housing is covered outside of each component except the first fluid passage in the scroll compressor, and the oil return pipe 300 is at least partially provided outside of the housing, so that the first fluid passage 30 can be provided without affecting the layout of each component in the compressor housing.

Preferably, as shown in fig. 9, the oil return pipe 300 includes a joint 27, a straight pipe section 29 and a U-shaped pipe section 32 connected in sequence, the joint 27 is used for being connected with the through hole structure, and the U-shaped pipe section 32 is disposed outside the housing of the scroll compressor. Preferably, a joint sealing ring 28 is arranged at the outer wall of the joint 27; the via structure comprises an interface 5d; the connector 27 can be inserted into the interface 5d and is connected with the interface 5d in a sealing manner. The diameter of the straight pipe section 29 is preferably designed to be smaller than the diameter of the U-shaped pipe section 32 to facilitate assembly of the oil return pipe 300.

As a preferred embodiment, the oil return pipe 300 is disposed inside the casing of the scroll compressor, which is favorable for maintaining the integrity of the scroll compressor and reducing the space occupied by the compressor, and the casing can protect the oil return pipe 300, so as to prevent the oil return pipe 300 erected outside the casing from being collided or damaged during transportation, installation or use, and be favorable for improving the structural reliability, use safety and aesthetic property of the compressor.

Preferably, the support portion 60 is detachably provided with a first connection member 31, and the first connection member 31 is used for communicating the oil return pipe 300 and the through hole structure. As shown in fig. 10 and 11, the first connecting piece 31 may be fixed on the supporting portion by a screw connection manner, or may be fixed by other feasible mounting manners, and a first channel 31a and a second channel 31b which are mutually communicated are provided in the first connecting piece 31, preferably, the first channel 31a and the second channel 31b are mutually perpendicular; the first channel 31a communicates with the via structure; the oil return pipe 300 comprises a joint 27, and a joint sealing ring 28 is arranged at the outer wall of the joint 27; the connector 27 is inserted into the second channel 31b and is connected with the second channel 31b in a sealing way. The first connecting member 31 is used for connecting the oil return pipe 300 and the through hole structure, and the first channel 31a and the second channel 31b which are perpendicular to each other enable the fluid entering the first connecting member 31 to change the flowing direction, so that the fluid in the oil return pipe 300 can be conveniently introduced into the through hole structure.

As shown in fig. 10 and 12, preferably, the scroll compressor further includes a partition plate 2 disposed between the discharge chamber 100 and the compression assembly, and an oil return hole 2a is provided on the partition plate 2; the partition plate 2 is detachably provided with a second connecting piece 33, one end of the oil return pipe 300, which is not provided with the joint 27, can be connected with the second connecting piece 33, the second connecting piece 33 is provided with a through hole, and the through hole can be communicated with the oil return pipe 300 and the oil return hole 2a. The second connecting piece 33 can be detachably arranged on the partition plate 2 by means of a screw connection.

As a preferred embodiment, the scroll compressor further includes: a suction chamber 200 for accommodating a fluid to be compressed; the compression assembly sucks the fluid to be compressed from the suction chamber 200 for compression, compresses the fluid to form high pressure fluid, and discharges the high pressure fluid into the discharge chamber 100. As shown in fig. 1, the motor 7, the compression assembly, the supporting part 60 and other components can be arranged in the air suction cavity 200, and the fluid in the air suction cavity 200 contacts with the lubricating oil on each component to be mixed and dissolved, so that the fluid to be compressed is mainly an oil-containing heat exchange medium. After being compressed into the exhaust chamber 100, these oil-bearing heat exchange media adhere to the chamber walls of the exhaust chamber 100 and eventually settle to the bottom of the exhaust chamber 100 due to gravity. The scroll compressor further comprises a second fluid passage 50, and the second fluid passage 50 is used for returning oil when the scroll compressor is stopped, that is, guiding the lubricating oil between the supporting portion 60 and the matching surface of the movable scroll 17 to return to the suction cavity 200, so as to improve the recycling efficiency of the lubricating oil.

As a preferred embodiment, the second fluid passage 50 includes: an oil return inlet end arranged between the supporting part 60 and the matching surface of the movable scroll 17; an oil return outlet end, wherein an oil return valve 39 communicated with the air suction cavity 200 is arranged at the oil return outlet end; preferably, as shown in fig. 6 and 7, the oil return valve 39 includes a valve housing 34, and a first opening 34a communicating with the oil return outlet port and an oil outlet hole 34c communicating with the suction chamber 200 are provided in the valve housing 34; a valve element 35, wherein the valve element 35 is arranged in the valve housing 34; when the scroll compressor is stopped, the valve element 35 can communicate the first opening 34a with the oil outlet 34c, so that the fluid in the second fluid passage 50 flows into the suction chamber 200 from the oil outlet 34c; when the scroll compressor is operated, the valve core 35 can close the oil outlet hole 34c, the oil return valve 39 seals the oil return outlet end, and the fluid in the second fluid passage 50 cannot flow into the suction chamber 200 through the oil outlet hole 34c, so as to prevent the high-pressure heat exchange medium in the high-pressure discharge chamber 100 from flowing back into the suction chamber 200, and reduce unnecessary energy loss.

As a preferred embodiment, a second opening 34b communicating with the suction chamber 200 is further provided in the valve housing 34; the fluid at the first opening 34a and the fluid at the second opening 34b can act on the valve spool 35 to generate a force on the valve spool 35, and the valve spool 35 can change positions according to the fluid pressure at the first opening 34a and the fluid pressure at the second opening 34b to open or close the oil outlet hole 34c. Preferably, as shown in fig. 6 and 7, the oil return valve further includes an elastic member disposed in the valve housing 34 and abutting against a side of the valve core 35 adjacent to the second opening 34 b. Further preferably, a pipeline is arranged inside the valve core 35, an opening communicated with the pipeline is arranged on the side wall of the valve core 35, and the lubricating oil entering the oil return valve 39 from the oil return outlet end can flow into the pipeline and flow to the opening on the side wall of the valve core 35.

When the scroll compressor is operated, the fluid pressure at the first opening 34a is greater than the fluid pressure at the second opening 34b, at this time, the valve core 35 is acted by the fluid pressure, and moves towards the elastic member to squeeze the elastic member and position the elastic member at the first position, as shown in fig. 7, at this time, the side wall of the valve housing 34 contacts with the opening of the side wall of the valve core 35 and seals the opening, the side wall of the valve core 35 seals the oil outlet 34c, the fluid in the pipeline in the valve core 35 cannot flow into the suction cavity 200, and the problem that the high-pressure fluid leaks into the low-pressure suction cavity 200 during the operation of the compressor is avoided;

when the scroll compressor is stopped, the fluid pressure at the first opening 34a is not greater than the fluid pressure at the second opening 34b, and the elastic member in a compressed state elastically returns to urge the valve core 35 to be positioned at the second position, as shown in fig. 6, at this time, the opening on the side wall of the valve core 35 is communicated with the oil outlet 34c, so that the lubricating oil in the pipeline can flow out from the oil outlet 34c and flow into the suction cavity 200, and the lubricating action is continued. As shown in fig. 6 and 7, the second position is closer to the first opening 34a than the first position.

As a preferred embodiment, when the support portion 60 is provided with the first groove 5a at the first wall surface of the support plate 5, the oil return inlet end is communicated with the first groove 5 a. When the compressor is shut down, the lubricating oil in the first groove 5a can flow into the second fluid passage 50 for oil return.

As a preferred embodiment, the scroll compressor is a low pressure side scroll compressor, and the fluid includes a heat exchange medium and/or lubricating oil. The low pressure side scroll compressor refers to a scroll compressor (as shown in fig. 1) in which a motor 7 is disposed in a low pressure chamber, and a movable scroll 17 of the low pressure side scroll compressor is easily compressed on a supporting portion 60 by high pressure gas in the compression chamber.

Embodiments of the invention are described below:

example 1

Fig. 1 is a schematic view of the overall structure of a preferred embodiment of the scroll compressor, where the scroll compressor mainly includes a motor 7, a supporting portion 60, a lower bracket 12, a fixed scroll 18, a movable scroll 17, a cross slip ring 4, a crankshaft 14, and the like, and the supporting portion 60 includes an upper bracket 6 and a supporting plate 5. The motor 7 is fixed on the lower shell 9 through a motor fixing frame 8, and the upper bracket 6 is fixed on the lower shell 9 through interference fit and axial thrust. The phase angles of the movable vortex plate 17 and the fixed vortex plate 18 are 180 degrees different and are oppositely arranged on the upper bracket 6, the movable vortex plate 17 moves under the drive of the crankshaft 14 and is meshed with the fixed vortex plate 18 to form a series of crescent sealed cavities which are isolated from each other and have continuously-changing volumes. The sealing cover 19 is mounted on the back of the fixed scroll 18, and the sealing cover 19 can axially float to form a sealed exhaust passage with the partition plate 2 during the operation of the compressor. It should be noted that the fixed scroll 18 has axial flexibility, i.e. it can float axially, but in normal operation, the fixed scroll 18 is tightly pressed against the movable scroll 17 by the axial force of the gas in the medium pressure chamber formed by the seal cover 19 and the back surface of the fixed scroll 18, and the movable scroll 17 is tightly pressed against the support plate 5 on the upper bracket 6 due to the action of the high pressure gas in the compression chamber and the force of the fixed scroll 18, and the support plate 5 is fixed on the upper bracket 6 by screws. The partition plate 2 and the upper cover 1 are fixed to the upper case 3 by welding, the partition plate 2 and the upper cover 1 form a high-pressure exhaust chamber 100, and the upper case 3 and the lower case 9 are fixed together by welding.

When the compressor runs, the motor 7 drives the crankshaft 14 to rotate, the crank section of the crankshaft 14 is provided with the radial flexible eccentric sleeve 16, the eccentric sleeve 16 drives the movable scroll 17 to move, and the movable scroll 17 moves in a translational motion around the center of the crankshaft 14 at a fixed radius under the rotation prevention limit of the cross slip ring 4. The heat exchange medium entering from the outside of the compressor is sucked into a crescent-shaped suction cavity 200 formed by the movable scroll 17 and the fixed scroll 18, compressed and then enters a high-pressure discharge cavity 100 formed by the upper cover 1 and the partition plate 2 through the discharge hole of the fixed scroll 18 and the check valve 21, and is discharged through the discharge pipe 20.

In order to solve the problems of serious abrasion of the movable scroll 17 and the supporting portion 60 and oil storage and return of the high-pressure exhaust cavity 100, the invention proposes to provide an oil return system between the high-pressure exhaust cavity 100 and the supporting plate 5, namely the first fluid passage 30, to introduce high-pressure gas and lubricating oil into a back pressure cavity between the movable scroll 17 and the supporting plate 5 so as to lubricate a contact surface between the movable scroll 17 and the supporting plate 5, and to reduce the axial pressure of the movable scroll 17 to the supporting plate 5 without floating the movable scroll 17, thereby reducing friction force so as to reduce abrasion and improve the reliability of the compressor. In addition, the structure provided by the invention can return the lubricating oil of the high-pressure exhaust cavity 100 to the suction cavity 200 when the compressor is stopped, so that the recycling rate of the lubricating oil is improved.

Specifically, as shown in fig. 3 and 4, the upper end surface of the support plate 5 is provided with three annular grooves, namely a first groove 5a, a second groove 5f and a third groove 5e, a second sealing ring 25 is arranged in the second groove 5f, a second wave spring is arranged between the second sealing ring 25 and the bottom of the second groove 5f, correspondingly, a third sealing ring 23 is arranged in the third groove 5e, and a third wave spring is arranged between the third sealing ring 23 and the bottom of the third groove 5 e. The wave spring bounces the sealing rings, so that the back surfaces of the second sealing ring 25, the third sealing ring 23, the supporting plate 5, the first groove 5a and the movable vortex plate 17 enclose a sealed back pressure cavity, as shown in fig. 3 and 8. Be provided with the through-hole structure in the backup pad 5, the first axial hole 5b and the first radial hole 5c that are linked together, first axial hole 5b is linked together with first recess 5a, first radial hole 5c is linked together with the oil return pipe 300 (as shown in fig. 2), and the one end that oil return pipe 300 links to each other with first radial hole 5c is provided with joint 27, joint sealing washer 28 (see fig. 9) is installed to joint 27's outer wall department, first radial hole 5c with joint 27's one end department that is connected is provided with interface 5d, joint 27 with interface 5d sealing connection. The oil return pipe 300 further comprises a straight pipe section 29 connected with the connector 27 and a U-shaped pipe section 32 connected with the straight pipe section 29, the connector 27, the straight pipe section 29 and the U-shaped pipe section 32 are sequentially and fixedly connected through welding, as shown in fig. 2, holes through which the oil return pipe 300 can pass are formed in corresponding positions on the upper bracket 6, the upper shell 3 and the lower shell 9, the oil return pipe 300 sequentially passes through the holes 6a on the upper bracket 6, the holes 3a of the upper shell 3 and the holes 9a of the lower shell 9, and the two parts are welded together with the upper shell 3 and the upper cover 1, and in the embodiment, most of the U-shaped pipe section 32 is located outside the compressor shell. One end of the U-shaped pipe section 32 is communicated with the bottom of the high-pressure exhaust cavity 100 formed by the partition plate 2 and the upper cover 1, namely, is connected with the bottom of the oil pool 0.

When the scroll compressor works, refrigerant with lubricating oil enters the high-pressure exhaust cavity 100 formed by the partition plate 2 and the upper cover 1 after being compressed, and as the refrigerant fills the whole exhaust cavity 100, the lubricating oil in the refrigerant is adhered to the inner wall of the upper cover 1 and the partition plate 2 and finally deposited in the oil pool 0 at the upper end of the partition plate 2, and more refrigerating oil is deposited along with the accumulation of time. The high-pressure gas and lubricating oil in the oil pool 0 enter a back pressure cavity formed by the support plate 5, the movable scroll 17, the second sealing ring 25 and the third sealing ring 23 through the U-shaped pipe section, the straight pipe section 29, the joint 27, the first radial hole 5c and the first axial hole 5b according to a calculation formula F ₁ P.S (P is the gas pressure in the back pressure chamber, S is the area sandwiched between the second groove 5F and the third groove 5 e), the axial force of the back pressure chamber on the movable scroll 17 can be obtained, and the acting force F can be adjusted by adjusting the area S enclosed by the second groove 5F and the third groove 5e ₁ Is of a size of (a) and (b). It should be noted that, the axial force generated by the back pressure chamber may not float the movable scroll 17, so that the interaction axial force between the movable scroll 17 and the support plate 5 may be reduced, i.e., the friction between the two may be reduced. In addition, the lubrication oil flowing into the back pressure chamber can lubricate the movable scroll 17 and the support plate 5, reducing the friction coefficient, and thus reducing wear.

Fig. 5 is a schematic view of an installation structure of the oil return valve 39, and similarly to the first radial hole 5c and the first axial hole 5b, a second axial hole 5g, a second radial hole 5h and a third axial hole 5i which are sequentially communicated are drilled at another position of the support plate 5, the second axial hole 5g is communicated with the first groove 5a, and an outer port of the second radial hole 5h is sealed. A fourth axial hole 6b and a radial threaded hole 6c are also drilled in the upper bracket 6 at a position corresponding to the third axial hole 5i, and an oil return valve 39 is fixed to the upper bracket 6 by threaded connection. Thus, the return valve 39, together with the holes in the upper bracket 6 and in the support plate 5, constitutes said second fluid passage 50.

As shown in fig. 6, when the compressor is in a shutdown state and the gas pressure in the high-pressure discharge chamber 100 and the gas pressure in the compressor suction chamber 200 are restored to be balanced, the first elastic structure 36 (spring) pushes up the valve core 35 to a second position as shown in fig. 6, a first oil leakage pipeline 35a and a second oil leakage pipeline 35b are arranged in the valve core 35, and a ring groove 35c communicated with the second oil leakage pipeline 35b is arranged at the side wall of the valve core 35. At this time, the lubricating oil in the deposited oil pool 0 returns to the lower part of the suction cavity 200 through the first fluid passage 30, the first groove 5a of the support plate 5, the second axial hole 5g, the second radial hole 5h, the third axial hole 5i, the fourth axial hole 6b, the radial threaded hole 6c, and the oil return valve 39, and the lubricating oil of the compressor is continuously participated.

As shown in fig. 7, when the compressor is in an operating state, the gas pressure in the high-pressure discharge chamber 100 is higher than the gas pressure in the compressor suction chamber 200. Under the action of the high-pressure gas in the high-pressure exhaust chamber 100, the valve core 35 will press the first elastic structure 36 and move towards the second opening 34b, and stay at the position shown in fig. 7, at this time, the annular groove 35c on the valve core 35 is located between the second valve core sealing ring 38b and the third valve core sealing ring 38c, and the oil outlet 34c on the valve housing 34 is located between the first valve core sealing ring 38a and the second valve core sealing ring 38b, so that the oil return valve 39 will remain closed and will not return oil in the working state of the compressor.

Example 2

In this embodiment, the present invention also provides a scroll compressor. As shown in fig. 10, as in embodiment 1, a first groove 5a, a second groove 5f and a third groove 5e are formed in the support plate 5, a second seal ring 25 and a second elastic structure 26 (wave spring) are disposed in the second groove 5f, a third seal ring 23 and a third elastic structure 24 (wave spring) are disposed in the third groove 5e, and the second seal ring 25, the third seal ring 23, the movable scroll 17 and the support plate 5 enclose a back pressure chamber, which is in communication with a first axial hole 5b and a first radial hole 5c located in the support plate 5. As shown in fig. 10 and 11, the side surface of the support plate 5 is fixed with a first connecting piece 31 by a screw, a first channel 31a and a second channel 31b which are mutually communicated are formed on the first connecting piece 31, the first channel 31a is communicated with the first radial hole 5c, and the second channel 31b is communicated with the oil return pipe 300. As shown in fig. 12, one end of the oil return pipe 300 is provided with a joint 27, and a joint sealing ring 28 is provided at the outer wall of the joint 27. The joint 27 is sealingly connected to the second passage 31 b. As shown in fig. 12, the second connecting piece 33 is fixed with the partition plate 2 by a screw, an oil return hole 2a is formed in the partition plate 2, and the other end of the oil return pipe 300 is fixed by the second connecting piece 33 and is communicated with the oil return hole 2 a. In this embodiment, the oil return pipe 300 is disposed inside the compressor housing. The assembly of the oil return valve 39 and the upper bracket 6 and the oil passage are the same as those of embodiment 1, and will not be described in detail here.

In summary, it is easily understood by those skilled in the art that the above-mentioned advantageous ways can be freely combined and superimposed without conflict.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any person who is in the light of the present invention can obtain other products in various forms, however, any change in shape or structure is within the scope of the present invention, and all the technical solutions that are the same or similar to the present application are included.

Claims

1. A scroll compressor, comprising:

a compression assembly for compressing a fluid, comprising an orbiting scroll (17);

a support portion (60) for supporting the movable scroll (17);

a discharge chamber (100), the fluid compressed by the compression assembly being discharged into the discharge chamber (100);

a first fluid passage (30) capable of guiding fluid in the exhaust chamber (100) to flow between the mating surfaces of the support portion (60) and the orbiting scroll (17) to reduce friction between the orbiting scroll (17) and the support portion (60); the scroll compressor further includes:

a suction chamber (200) for containing a fluid to be compressed;

a second fluid passage (50), said second fluid passage (50) being capable of directing fluid between said support (60) and the mating surface of said orbiting scroll (17) into said suction chamber (200) when said scroll compressor is shut down;

The second fluid passage (50) includes:

the oil return inlet end is arranged between the matching surfaces of the supporting part (60) and the movable vortex plate (17);

the oil return outlet end is provided with an oil return valve (39) communicated with the air suction cavity (200);

-said return valve (39) being capable of communicating said return outlet port with said suction chamber (200) when said scroll compressor is shut down, enabling fluid in said second fluid passage (50) to flow into said suction chamber (200); the oil return valve (39) is capable of sealing the oil return outlet end when the scroll compressor is in operation.

2. The scroll compressor of claim 1, wherein the first fluid passage (30) comprises:

a first end in communication with the exhaust chamber (100);

and a second end for introducing fluid in the first fluid passage (30) between the support (60) and the mating surface of the orbiting scroll (17).

3. A scroll compressor according to claim 2, wherein the support portion (60) comprises a support plate (5), the support plate (5) having a first wall surface opposite the orbiting scroll (17);

a first groove (5 a) is formed in the first wall surface, and the first groove (5 a) is communicated with the second end, so that fluid in the exhaust cavity (100) can flow into the first groove (5 a); and/or the number of the groups of groups,

The movable vortex plate (17) is provided with an oil distribution groove on the wall surface opposite to the first wall surface, the oil distribution groove is communicated with the second end, and fluid in the exhaust cavity (100) can flow into the oil distribution groove.

4. A scroll compressor according to claim 3, wherein the first recess (5 a) is an annular recess in which fluid entering the recess can be evenly distributed.

5. The scroll compressor of claim 3 or 4, wherein the first wall surface is further provided with:

a second groove (5 f), wherein a second sealing structure is arranged in the second groove (5 f);

a third groove (5 e), wherein a third sealing structure is arranged in the third groove (5 e);

the second sealing structure and the third sealing structure can enclose a sealed back pressure cavity with the supporting plate (5) and the movable scroll (17), and the first groove (5 a) is positioned in the back pressure cavity.

6. The scroll compressor according to claim 5, wherein the second groove (5 f) and the third groove (5 e) are concentrically arranged annular grooves;

when the first groove (5 a) is an annular groove, the first groove (5 a), the second groove (5 f) and the third groove (5 e) are concentrically arranged, and the diameter of the first groove (5 a) is larger than that of the second groove (5 f) but smaller than that of the third groove (5 e).

7. The scroll compressor according to claim 5, wherein the second sealing structure comprises a second sealing ring (25) arranged in the second groove (5 f), a second elastic structure (26) being further arranged between the second sealing ring (25) and the bottom of the second groove (5 f);

the third sealing structure comprises a third sealing ring (23) arranged in the third groove (5 e), and a third elastic structure (24) is further arranged between the third sealing ring (23) and the bottom of the third groove (5 e).

8. A scroll compressor according to claim 5, wherein the force exerted by the fluid in the back pressure chamber on the movable scroll (17) in a direction away from the support plate (5) is not greater than the force exerted by the movable scroll (17) towards the support plate (5) when the scroll compressor is in operation.

9. The scroll compressor of claim 2, wherein the first end communicates with a bottom of the discharge chamber (100) in a gravitational direction.

10. A scroll compressor according to claim 3, wherein the first fluid passage (30) comprises an oil return tube (300) and a through-hole structure provided in the support portion (60);

The oil return pipe (300) is communicated with the exhaust cavity (100) and the through hole structure, and the through hole structure can introduce fluid in the oil return pipe (300) between the matching surfaces of the movable scroll (17) and the supporting plate (5).

11. The scroll compressor of claim 10, wherein the oil return tube (300) is at least partially disposed outside of a housing of the scroll compressor.

12. The scroll compressor of claim 11, wherein,

the oil return pipe (300) comprises a joint (27), a straight pipe section (29) and a U-shaped pipe section (32) which are sequentially connected, wherein the joint (27) is used for being connected with the through hole structure, and the U-shaped pipe section (32) is arranged outside the shell of the scroll compressor.

13. The scroll compressor of claim 12, wherein,

a joint sealing ring (28) is arranged at the outer wall of the joint (27);

the via structure comprises an interface (5 d);

the connector (27) can be inserted into the interface (5 d) and is connected with the interface (5 d) in a sealing way.

14. The scroll compressor of claim 10, wherein the oil return pipe (300) is provided inside a housing of the scroll compressor.

15. The scroll compressor according to claim 14, wherein the support portion (60) is detachably provided with a first connection member (31), the first connection member (31) being adapted to communicate the oil return pipe (300) with the through-hole structure.

16. The scroll compressor according to claim 15, wherein a first channel (31 a) and a second channel (31 b) are provided in the first connection member (31) in communication with each other, the first channel (31 a) being in communication with the through-hole structure;

the oil return pipe (300) comprises a joint (27), and a joint sealing ring (28) is arranged at the outer wall of the joint (27);

the joint (27) is inserted into the second channel (31 b) and is connected with the second channel (31 b) in a sealing way.

17. A scroll compressor according to any one of claims 14-16, further comprising a partition plate (2) arranged between the discharge chamber (100) and the compression assembly, the partition plate (2) being provided with an oil return hole (2 a);

the partition plate (2) is detachably provided with a second connecting piece (33), and the second connecting piece (33) can be communicated with the oil return pipe (300) and the oil return hole (2 a).

18. The scroll compressor according to claim 1, wherein the oil return valve (39) comprises:

A valve housing (34), wherein a first opening (34 a) communicated with the oil return outlet end and an oil outlet hole (34 c) communicated with the air suction cavity (200) are arranged on the valve housing (34);

a valve element (35), wherein the valve element (35) is arranged in the valve housing (34); when the scroll compressor is stopped, the valve core (35) can be communicated with the first opening (34 a) and the oil outlet (34 c), so that the fluid in the second fluid passage (50) can flow into the air suction cavity (200) through the oil outlet (34 c); the valve element (35) is capable of closing the oil outlet hole (34 c) when the scroll compressor is operated.

19. The scroll compressor according to claim 18, wherein said valve housing (34) further has a second opening (34 b) therein in communication with said suction chamber (200); the spool (35) is capable of changing position according to the fluid pressure at the first opening (34 a) and the fluid pressure at the second opening (34 b) to open or close the oil outlet hole (34 c).

20. The scroll compressor according to claim 19, wherein said oil return valve further comprises an elastic member disposed within said valve housing (34) and abutting against a side of said valve spool (35) adjacent to said second opening (34 b);

When the scroll compressor is operated, the fluid pressure at the first opening (34 a) is greater than the fluid pressure at the second opening (34 b), the valve core (35) presses the elastic member and is positioned at a first position, and the side wall of the valve core (35) blocks the oil outlet (34 c);

when the scroll compressor is stopped, the fluid pressure at the first opening (34 a) is not greater than the fluid pressure at the second opening (34 b), and the valve core (35) is positioned at a second position under the elastic restoring action of the elastic piece and is communicated with the first opening (34 a) and the oil outlet (34 c).

21. The scroll compressor according to claim 5, wherein the oil return inlet end communicates with the first recess (5 a) when the support portion (60) includes the support plate (5), the first recess (5 a) being provided at a first wall surface of the support plate (5).

22. The scroll compressor of claim 1, wherein the scroll compressor is a low pressure side scroll compressor, and the fluid comprises a heat exchange medium and/or a lubricating oil.