CN213205965U

CN213205965U - Scroll compressor, refrigeration equipment and automobile

Info

Publication number: CN213205965U
Application number: CN202021065417.3U
Authority: CN
Inventors: 曹俊
Original assignee: Anhui Dafu Intelligent Air Conditioning Technology Co ltd
Current assignee: Anhui Dafu Intelligent Air Conditioning Technology Co ltd
Priority date: 2020-06-10
Filing date: 2020-06-10
Publication date: 2021-05-14
Anticipated expiration: 2030-06-10

Abstract

The application discloses a scroll compressor, refrigeration equipment and an automobile, wherein the scroll compressor comprises a shell, a fixed scroll, a movable scroll, a rotating shaft and a bearing seat; an exhaust cavity is formed between the fixed scroll and the shell, and a backflow channel communicated with the exhaust cavity is arranged; the movable scroll plate is meshed with the fixed scroll plate, and a compression cavity is formed between the movable scroll plate and the fixed scroll plate; a back pressure cavity is formed between the bearing seat and the movable scroll plate, and a groove for communicating the backflow channel with the back pressure cavity is formed in the end face facing the fixed scroll plate; the rotating shaft penetrates through the bearing seat and is connected with the movable scroll plate so as to drive the movable scroll plate to rotate relative to the fixed scroll plate; wherein, move and seted up at least one balanced passageway on the vortex dish, balanced passageway intercommunication compression chamber and backpressure chamber. The application guarantees that the refrigeration oil can better circulate in the scroll compressor in the operation process of the scroll compressor, and the movable scroll plate and the fixed scroll plate are good in axial floating seal.

Description

Scroll compressor, refrigeration equipment and automobile

Technical Field

The application relates to the technical field of compressors, in particular to a scroll compressor, refrigeration equipment and an automobile.

Background

The compressor is used as the heart of a refrigerating system, is a fluid machine which compresses sucked low-pressure working medium into high-pressure working medium and then discharges the high-pressure working medium, wherein the scroll compressor is widely applied due to the characteristics of small volume, low noise, energy conservation, high efficiency and the like.

The relative rotation that current scroll compressor mainly relies on moving vortex dish and static vortex dish realizes the compression to working medium between the two, and at scroll compressor operation in-process, each moving part and friction pair need last with abundant lubrication, in addition, move the vortex dish and receive high pressure working medium's influence easily, and appear with the condition that static vortex dish axial breaks away from, can increase high pressure working medium's internal leakage like this. These problems may result in a reduction in the energy efficiency and life of the scroll compressor.

SUMMERY OF THE UTILITY MODEL

The application provides a scroll compressor, refrigeration plant and car to guarantee that the scroll compressor operation in-process lets the refrigeration oil realize better circulation inside the scroll compressor, move the good floating seal of vortex dish and quiet vortex dish axial simultaneously.

In order to achieve the above object, the present application provides a scroll compressor, which includes a housing, a fixed scroll, a movable scroll, a rotating shaft, and a bearing seat;

an exhaust cavity is formed between the fixed scroll and the shell, and a backflow channel communicated with the exhaust cavity is arranged;

the movable scroll plate is meshed with the fixed scroll plate, and a compression cavity is formed between the movable scroll plate and the fixed scroll plate;

a back pressure cavity is formed between the bearing seat and the movable scroll plate, and a groove for communicating the backflow channel with the back pressure cavity is formed in the end face facing the fixed scroll plate;

the rotating shaft penetrates through the bearing seat and is connected with the movable scroll plate so as to drive the movable scroll plate to rotate relative to the fixed scroll plate;

wherein, move and seted up at least one balanced passageway on the vortex dish, balanced passageway intercommunication compression chamber and backpressure chamber.

In order to solve the technical problem, the present application provides a refrigeration apparatus including the scroll compressor.

In order to solve the technical problem, the application provides an automobile which comprises the refrigeration equipment.

This application is provided with the first recess in intercommunication backpressure chamber at the bearing frame, be equipped with the backward flow passageway of intercommunication exhaust chamber and first recess at the static vortex dish, thereby the working medium in exhaust chamber flows back to the backpressure chamber through the backward flow passageway on the static vortex dish and the first recess on the bearing frame, the axial effort that the working medium in the backpressure chamber produced to the movable vortex dish is relative with the axial effort that the working medium in the compression intracavity produced to the movable vortex dish, can be through adjusting gas pressure in the backpressure chamber, thereby make the axial effort that the working medium in the backpressure chamber produced to the movable vortex dish and the axial effort that the working medium in the compression intracavity produced to the movable vortex dish offset each other. Specifically, at least one balance channel communicated with the back pressure cavity and the compression cavity is arranged on the movable scroll plate, working media in the compression cavity can exchange materials with the working media in the back pressure cavity through the balance channel, so that the pressures of the compression cavity and the back pressure cavity on two opposite sides of the movable scroll plate are balanced, so that the axial acting force exerted by the working medium in the back pressure cavity on the movable scroll can be mutually offset with the axial acting force exerted by the working medium in the compression cavity on the movable scroll, in addition, the refrigeration oil realizes good circulation in the scroll compressor, so that good oil seal is established between the movable scroll and the fixed scroll, the internal leakage is reduced, therefore, through the structure for actively adjusting the back pressure, the scroll compressor can well maintain the optimal oil circulation and the back pressure under various rotating speeds and various system working conditions, and has the advantages of better energy efficiency ratio, smoother energy efficiency curve and higher reliability.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of the structure of one embodiment of the scroll compressor of the present application;

FIG. 2 is a schematic view of an embodiment of a bearing seat in the scroll compressor of the present application;

FIG. 3 is a schematic structural view of an embodiment of a orbiting scroll in a scroll compressor;

FIG. 4 is a schematic structural view of another embodiment of an orbiting scroll in a scroll compressor;

FIG. 5 is a schematic view of an embodiment of a wear plate in a scroll compressor according to the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to FIG. 1, FIG. 1 is a schematic structural view of an embodiment of a scroll compressor of the present application; the scroll compressor 100 of the present embodiment includes a fixed scroll 11, an orbiting scroll 12, a bearing housing 13, a rotating shaft 14, and a housing 16.

The fixed scroll 11 and the movable scroll 12 are meshed and connected as main components for realizing gas compression, a compression cavity 15 is formed between the fixed scroll 11 and the movable scroll 12, and the movable scroll 12 rotates relative to the fixed scroll 11 to realize compression of working media in the compression cavity 15.

Specifically, the fixed scroll 11 includes a fixed scroll 111 and a fixed wrap 112, the fixed scroll 111 has a frame structure, and the fixed wrap 112 is provided in the fixed scroll 111. The orbiting scroll 12 includes an orbiting scroll base 121 and an orbiting scroll wrap 122, the orbiting scroll base 121 is a flat plate structure, and the orbiting scroll wrap 122 is disposed on the orbiting scroll base 121. The fixed scroll 11 and the orbiting scroll 12 are coupled by 180 ° offset meshing engagement of the fixed wrap 112 and the orbiting wrap 122, and the orbiting scroll 12 is integrally disposed in the fixed scroll 111.

Based on 180-degree opposite meshing of the fixed spiral wrap 112 and the movable spiral wrap 122, the movable scroll 12 performs rotary translation in the fixed scroll 11, so that the working medium in the peripheral area of the compression cavity 15 can be gradually compressed to the central area of the compression cavity 15, and then the low-pressure working medium is compressed into the high-pressure working medium.

Therefore, an intake port 113 is provided in the outer peripheral portion of the fixed scroll 111, and an exhaust port 114 is provided in the central region of the bottom portion of the fixed scroll 111. The low-pressure working medium enters the compression cavity 15 from the air suction port 113, is compressed to the central area of the compression cavity 15 under the relative motion of the movable scroll 12 and the fixed scroll 11, and is compressed into a high-pressure working medium; high pressure working fluid is then exhausted through exhaust port 114.

In order to realize the rotation of the movable scroll 12 relative to the fixed scroll 11, in the present embodiment, the power transmission is realized through the rotating shaft 14, and the rotating shaft 14 is inserted into the bearing seat 13 and connected to the movable scroll 12 to drive the movable scroll 12 to rotate relative to the fixed scroll 11. The orbiting scroll 12 is provided with a boss hole 125, and the rotating shaft 14 may be inserted into the boss hole 125 to be connected to the orbiting scroll 12.

Specifically, when the scroll compressor 100 is operated, the rotation of the rotating shaft 14 is finally transmitted as the rotational translation of the movable scroll 12, and in order to make the rotation of the rotating shaft 14 more smooth and stable, the first bearing 131 is accommodated in the bearing housing 13, and when the rotating shaft 14 is inserted into the bearing housing 13, the first bearing 131 is connected to the bearing housing 13 through the first bearing 131, and the first bearing 131 may also be referred to as a main bearing for the rotation of the rotating shaft 14. A second bearing 123 is provided between the rotating shaft 14 and the orbiting scroll 12, and the transmission shaft 14 is connected to the orbiting scroll 12 through the second bearing 123 to drive the orbiting scroll 12 to orbit with respect to the fixed scroll 11. Second bearing 123 may be disposed within boss bore 125. Wherein, a shaft seal 132 is further provided at the junction of the bearing seat 13 and the rotating shaft 14 to realize the sealing of the junction.

In order to realize the revolving translation of the orbiting scroll 12 relative to the fixed scroll 11, the rotating shaft 14 further includes a main shaft 141, an eccentric cam 142 and an eccentric cam 143, which are fixedly connected. The eccentric wheel 143 is inserted into the second bearing 123, and the eccentric shaft head 142 drives the movable scroll 12 to move through the eccentric wheel 143 and the second bearing 123.

In order to prevent the orbiting scroll 12 from rotating, an anti-rotation structure is further provided in the scroll compressor 100, specifically, an anti-rotation post 133 is provided on the end surface of the bearing housing 13 facing the orbiting scroll 12, an anti-rotation ring 124 corresponding to the anti-rotation post 133 is provided on the orbiting scroll base 121 of the orbiting scroll 12, the anti-rotation ring 124 is specifically disposed in the groove of the orbiting scroll base 121, and when the anti-rotation post 133 and the anti-rotation ring 124 are used in cooperation, the anti-rotation post 133 is disposed in the anti-rotation ring 124 to prevent the orbiting scroll 12 from rotating under the driving of the eccentric stub 142.

The fixed scroll 11, the orbiting scroll 12, the bearing housing 13, and the rotating shaft 14 are all provided in a casing 16. An exhaust chamber 161 is formed between the housing 16 and the fixed scroll 11, and a low-pressure suction chamber 162 is formed between the housing and the bearing housing 13.

Specifically, the housing 16 includes a body portion 163 and an end cover portion 164, the bearing housing 13 is provided in the body portion 163, the rotating shaft 14 has one end of the eccentric shaft head 142 inserted into one end of the bearing housing 13 and is rotatably connected to the movable scroll 12 located at the other end of the bearing housing 13, the fixed scroll 11 and the movable scroll 12 which are engaged and connected are pressed against the bearing housing 13 by the end cover portion 164, the movable scroll 12 is provided close to the bearing housing 13, and the end cover portion 164 is connected to the body portion 163 to constitute the housing 16. An exhaust chamber 161 is formed between the end cover portion 164 and the fixed scroll 11, and a low-pressure intake chamber 162 is formed between the body portion 163 and the bearing housing 13.

When the scroll compressor 100 is in operation, low-pressure working medium entering the scroll compressor 100 from the body part 163 passes through the low-pressure suction cavity 162 and enters between the movable scroll 12 and the fixed scroll 11 from the suction port 113 of the fixed scroll 11; the low-pressure working medium is compressed into a high-pressure working medium under the relative rotation of the movable scroll 12 and the fixed scroll 11; high-pressure working medium is discharged from the discharge port 114 of the fixed scroll 11, through the through hole 165 of the end cover portion 164, and through the discharge chamber 161. It will be appreciated that the working fluid exhausted through the exhaust chamber 161 is high pressure working fluid, and the exhaust chamber 161 may also be referred to as a high pressure exhaust chamber.

The scroll compressor 100 of the present embodiment further includes a motor 17 and a driving controller 18, wherein the motor 17 is disposed in the body 163 and connected to the rotating shaft 14 to drive the rotating shaft 14 to rotate; the driving controller 18 is disposed outside the body part 163 and connected to the motor 17 for receiving a power source and an operation command to drive the motor 17.

To ensure smooth rotation of the rotating shaft 14 in the body portion 163, a third bearing 144 is further disposed at the other end of the rotating shaft 14 where the eccentric stub shaft 142 is not disposed, and is rotatably connected to the body portion 163 through the third bearing 144, and the third bearing 144 is also referred to as a slave bearing for rotation of the rotating shaft 14.

In the above scroll compressor 100, when the movable scroll 12 is in operation, the working medium in the compression chamber 15 between the movable scroll 12 and the fixed scroll 11 has an axial force F1 to the movable scroll 12, and F1 is constantly changed, which easily causes the movable scroll 12 to move axially, and then the movable scroll 12 is separated from the fixed scroll 11. For example, the movable scroll 12 rotates relative to the fixed scroll 11, the low-pressure working medium in the peripheral area of the compression cavity 15 is gradually compressed to the central area of the compression cavity 15, and is compressed to be the high-pressure working medium in the central area, the acting force F1 generated by the high-pressure working medium on the movable scroll 12 is large, so that the movable scroll 12 moves towards the direction of separating from the fixed scroll 11, an inter-tooth gap is generated between the movable scroll and the fixed scroll, the sealing performance is reduced, the internal leakage of the working medium is aggravated, and the energy efficiency of the whole scroll compressor is low.

In view of the above problem, in the scroll compressor 100 of the present embodiment, the dynamic balance of the movable scroll 12 is realized by the back pressure adjustment and the cancellation of the axial acting force F1, so as to ensure the axial flexible seal between the movable scroll 12 and the fixed scroll 11.

Specifically, as shown in fig. 1 and 2, the bearing housing 13 is disposed adjacent to the orbiting scroll 12 to form the back pressure chamber 19 with the orbiting scroll 12, the bearing housing 13 is provided with a first groove 138 communicating with the back pressure chamber 19, and the fixed scroll 11 is provided with a return passage 115 communicating with the discharge chamber 161 and the first groove 138, so that the discharge chamber 161 can communicate with the back pressure chamber 19 through the return passage 115 and the first groove 138. And at least one balance passage 126 communicating the back pressure chamber 19 and the compression chamber 15 is provided in the orbiting scroll 12.

Working medium in the exhaust cavity 161 flows back to the back pressure cavity 19 through the return channel 115 on the fixed scroll 11 and the first groove 138 on the bearing seat 13, and the working medium in the back pressure cavity 19 generates an axial acting force F2 on the movable scroll 12, which is opposite to the axial acting force F1.

The balance channel 126 which is formed on the movable scroll 12 and is used for communicating the compression cavity 15 with the back pressure cavity 19 enables working media such as refrigerating oil in the back pressure cavity 19 to directly enter the compression cavity 15 between the movable scroll 12 and the fixed scroll 11, so that good oil seal is established between the movable scroll 12 and the fixed scroll 11, internal leakage is reduced, the working media such as the refrigerating oil entering the compression cavity 15 can be finally discharged from the exhaust port 114 of the fixed scroll 11, and oil circulation of the scroll compressor 100 is realized; in addition, the balance channel 126 is bidirectional, the working medium in the compression cavity 15 can exchange substances with the working medium in the backpressure cavity 19 through the balance channel 126, so that the pressures of the compression cavity 15 and the backpressure cavity 19 on the two opposite sides of the movable scroll 12 are balanced, the axial acting force F2 applied to the movable scroll 12 by the working medium in the backpressure cavity 19 can be mutually offset with the axial acting force F1 applied to the movable scroll 12 by the working medium in the compression cavity 15, and therefore through the structure for actively adjusting the backpressure, the scroll compressor 100 can well maintain the optimal oil circulation and backpressure under various rotating speeds and various system working conditions, the energy efficiency ratio is more excellent, the energy efficiency curve is smoother, and the reliability is higher.

The number of balanced channel arrangements may be one or more, for example the number of balanced channel arrangements is 2, 5 or 6, although not limited thereto. And a plurality of balance channels may be symmetrically disposed on the orbiting scroll.

At least a portion of the balance passage 126 opens to the orbiting scroll base 121. For example, as shown in fig. 3, the balance passage 126 may open on the orbiting scroll wrap 122 and/or the orbiting scroll base 121, i.e., the balance passage 126 includes a first sub-passage 1262 opening on the orbiting scroll wrap 122 and a second sub-passage 1261 opening on the orbiting scroll base 121. Preferably, as shown in fig. 1, the balance passage 126 is formed entirely in the orbiting scroll base 121, which facilitates the formation and formation of the balance passage 126.

Additionally, the axis of the balance passage 126 may be parallel to the axis of the orbiting scroll 12 so as to open the balance passage 126. In other implementations, the axis of the balance channel 126 may also be disposed crosswise to the axis of the orbiting scroll 12.

The flow cross-section of the balancing channel 126 may be circular, regular polygonal, trapezoidal, or other regular or irregular shapes.

Further, the flow cross-sectional area of the balance channel 126 may be 0.2-12 mm². When the flow cross section of the balance channel 126 is circular, the flow diameter of the balance channel 126 may be 0.5-4 mm.

Alternatively, the flow cross-sectional area of the equalization channel 126 remains constant or varies along the flow direction of the working medium. For example, the flow cross-sectional area of the equalization channel 126 may increase and then decrease, or gradually increase or gradually decrease, in the direction of flow of the working medium.

Additionally, the cross-sectional flow area of the equalization channel 126 may be positively correlated to the cross-sectional flow area of the return channel 115.

Further, the balance channel 126 may be disposed outside of the boss hole 125. Of course, it will be understood that, as shown in FIG. 4, the balance passage 126 may also be in communication with the boss bore 125 such that gas in the back pressure chamber 19 may first enter the boss bore 125 and then pass through the balance passage 126 into the compression chamber 15, i.e., the compression chamber 15 may be in communication with the back pressure chamber 19 through the boss bore 125, the balance passage 126.

In addition, the compression chamber 15 includes a suction chamber, an intermediate pressure chamber, and a discharge chamber. It is understood that the compression chamber 15 between the orbiting scroll 12 and the fixed scroll 11 may be divided into a plurality of sub-compression chambers by the orbiting wrap 122 and the fixed wrap 112. The suction chamber, the intermediate pressure chamber, and the discharge chamber may be some of a plurality of sub-compression chambers. More specifically, the suction chamber may refer to a sub-compression chamber into which a working medium is sucked to start a compression operation. The discharge chamber communicating with the discharge port 114 may refer to a sub-compression chamber that is just discharged or is in the process of being discharged. The intermediate pressure chamber disposed between the suction chamber and the discharge chamber may refer to a sub-compression chamber in which a compression operation is in progress or performed. The suction, intermediate and/or discharge chambers communicate with the back pressure chamber 19 via at least one equalization channel 126. Preferably, the intermediate pressure chamber and/or the discharge chamber communicate with the counter pressure chamber 19 via at least one equalization channel 126.

In addition, the fixed scroll is circumferentially provided with an outer wall, and the return passage is arranged in the outer wall.

Further, the scroll compressor 100 may include wear plates 134. As shown in fig. 5, the wear-resistant sheet 134 is disposed between the orbiting scroll 12 and the bearing housing 13. The wear-resistant plate 134 is provided with a communication passage 1341, the communication passage 1341 is communicated with the return passage 115, and the communication passage 1341 is communicated with the first groove 138. At this time, the first groove 138 communicates with the exhaust chamber 161 through the communication passage 1341 and the return passage 115. The communication channel 1341 may be a channel of any shape, and is not limited to a hole-shaped channel, as long as one end of the communication channel 1341 is communicated with the return channel 115, and the other end of the communication channel 1341 is communicated with the return channel 115.

It can be understood that the first groove 138 may not extend through the outer sidewall of the bearing seat 13, so as to prevent the working medium flowing from the exhaust chamber 161 into the back pressure chamber 19 from leaking between the bearing seat 13 and the housing 16 through the first groove 138 due to the first groove 138 extending through the outer sidewall of the bearing seat 13, thereby preventing the working medium from leaking and ensuring the circulation of the refrigerant oil.

In addition, the end surface of the bearing housing 13 facing the orbiting scroll 12 is provided with a second groove 135. Also, the wear-resistant pieces 134 may cover the second groove 135.

The above-mentioned structures of the orbiting scroll 12, the fixed scroll 11 and the bearing seat 13 constitute a back pressure regulation system and an oil circulation system of the scroll compressor 100 of the present embodiment, and the operation principle thereof can be understood with reference to fig. 1.

In the operation process of the scroll compressor 100, the movable scroll 12 moves relative to the fixed scroll 11, and then compresses the working medium in the compression cavity 15, so that the gas pressure of the working medium in the compression cavity 15 is increased, and further the axial acting force F1 of the movable scroll 12 is increased.

In the process, the working medium in the exhaust cavity 161 enters the back pressure cavity 19 through the return channel 115, the communication channel 1341 and the first groove 138 on the bearing seat 13, and for the process, the cross-sectional shapes, sizes and lengths of all the channels can be changed and combined as required, so that throttling depressurization is realized, and the pressure of the gas returning to the back pressure cavity 19 is reduced to the design pressure. For example, the communication passage 1341 may be designed as a thin and long passage through which the high-pressure working medium is further throttled and depressurized and then enters the back pressure chamber 19 through the first groove 138. The working fluid and the refrigerant oil introduced into the back pressure chamber 19 can flow into the compression chamber 15 through the balance passage 126 of the orbiting scroll 12.

In a normal state, the gas pressure in the back pressure chamber 19 is kept low, and when the axial force F1 is increased, the working fluid in the compression chamber 15 can flow into the back pressure chamber 19 from the balance channel 126 to increase the pressure in the back pressure chamber 19, so that the axial force F2 is increased correspondingly, so that the axial force F2 and the axial force F1 can be counteracted with each other to keep the balance of the movable scroll 12. With reduced F1 and greater F2, working fluid in back pressure chamber 19 may flow from balance channel 126 into compression chamber 15 to increase the pressure in compression chamber 15 and the pressure in back pressure chamber 19 decreases until axial force F1 and axial force F2 are balanced.

Through the above adjustment process, the dynamic balance of the orbiting scroll 12 is achieved, so that a good axial fit and seal state can be always maintained between the orbiting scroll 12 and the fixed scroll 11. The embodiment utilizes the motion of moving scroll 12 in scroll compressor 100, has realized the backpressure through moving the balanced passageway 126 on scroll 12 and has adjusted, guarantees promptly through simple structural design that the good axial laminating of moving scroll 12 and static scroll 11 is sealed, and simultaneously, complete oil return circulation system provides sufficient and stable fuel feeding for this process, realizes the flexible sealed function of axial promptly, has guaranteed scroll compressor's high energy efficiency, low-power consumption, high reliability then.

The scroll compressor of the above-described embodiment can be used as a manufacturing refrigerating apparatus, and thus the present application also proposes a refrigerating apparatus including the above-described scroll compressor. Further, the refrigeration equipment can be applied to automobiles, so the application also provides an automobile comprising the refrigeration equipment with the scroll compressor.

The above embodiments are merely examples and are not intended to limit the scope of the present disclosure, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present disclosure or those directly or indirectly applied to other related technical fields are intended to be included in the scope of the present disclosure.

Claims

1. A scroll compressor, comprising:

a housing;

the fixed scroll plate forms an exhaust cavity with the shell and is provided with a return channel communicated with the exhaust cavity;

the movable scroll plate is meshed with the fixed scroll plate and forms a compression cavity with the fixed scroll plate;

a back pressure cavity is formed between the bearing seat and the movable scroll, and a groove for communicating the backflow channel with the back pressure cavity is formed in the end face, facing the fixed scroll, of the bearing seat;

at least one balance channel is formed in the movable scroll plate and communicated with the compression cavity and the back pressure cavity.

2. The scroll compressor of claim 1, wherein a cross-sectional flow area of the return passage is positively correlated with a cross-sectional flow area of the balancing passage.

3. The scroll compressor of claim 1, wherein the cross-sectional flow area of the balancing passage is 0.2-12 mm²。

4. The scroll compressor of claim 1, wherein the fixed scroll wrap circumference has an outer wall, the return flow passage being disposed within the outer wall.

5. The scroll compressor of claim 1, wherein the scroll compressor includes a wear plate having a communication passage therein, the recess communicating with the return passage through the communication passage.

6. The scroll compressor of claim 1, wherein the groove does not extend through an outer side wall of the bearing housing.

7. A refrigeration appliance, characterized in that it comprises a scroll compressor according to any one of claims 1 to 6.

8. An automobile, characterized in that it comprises a refrigerating device as claimed in claim 7.