CN112963354A

CN112963354A - Movable scroll, backpressure structure and carbon dioxide compressor

Info

Publication number: CN112963354A
Application number: CN202110437194.1A
Authority: CN
Inventors: 不公告发明人
Original assignee: Chongqing Chaoli Hi Tech Co Ltd
Current assignee: Chongqing Chaoli Hi Tech Co Ltd
Priority date: 2021-04-22
Filing date: 2021-04-22
Publication date: 2021-06-15

Abstract

The invention relates to the technical field of compressors, in particular to a movable scroll, a backpressure structure and a carbon dioxide compressor. The movable scroll comprises a movable scroll body, a movable scroll, a pressure guide hole and a back pressure hole; the movable scroll is arranged on the movable disc body; the pressure guide hole simultaneously penetrates through the movable scroll and the movable disc body, and is close to the exhaust hole of the fixed scroll so as to guide high-pressure fluid near the exhaust hole to the back pressure cavity; the back pressure hole is penetratingly arranged on the movable disc body to reduce the pressure of the back pressure cavity. The pressure between the back pressure cavity and the compression cavity can be balanced, so that the high-efficiency stable operation of the dynamic and static scrolls is guaranteed.

Description

Movable scroll, backpressure structure and carbon dioxide compressor

Technical Field

The invention relates to the technical field of compressors, in particular to a movable scroll, a backpressure structure and a carbon dioxide compressor.

Background

The back pressure structure is used as an important structure in the carbon dioxide compressor and is very important to the operation working condition of the compressor. However, the back pressure cavity of the existing back pressure structure is unreasonable in arrangement, so that the back pressure received by the movable scroll is often unbalanced, and the movable scroll is overturned.

Disclosure of Invention

The object of the present invention includes, for example, providing a movable scroll, a back pressure structure and a carbon dioxide compressor, which can balance the pressure between a back pressure chamber and a compression chamber, thereby ensuring efficient and stable operation of the movable scroll.

Embodiments of the invention may be implemented as follows:

in a first aspect, the present invention provides an orbiting scroll for forming a compression chamber with a fixed scroll and a back pressure chamber with a front cover assembly, comprising:

the movable plate body, the movable scroll, the pressure guide hole and the back pressure hole; the movable scroll is arranged on the movable disc body;

the pressure guide hole penetrates through the movable scroll and the movable disc body simultaneously, and is close to the exhaust hole of the fixed scroll disc so as to guide high-pressure fluid near the exhaust hole to the back pressure cavity;

the back pressure hole is penetratingly arranged on the movable disc body to reduce the pressure of the back pressure cavity.

The one end that draws pressure hole of this scheme's dynamic vortex dish is connected with the compression chamber, draws the other end that presses the hole and is connected with the back pressure chamber. When the movable scroll disk starts to rotate, the movable scroll disk moves relative to the fixed scroll disk and changes the volume of a compression cavity, so that the purpose of compressing gas is achieved. Along with the continuous operation of the movable scroll disk, the pressure of the exhaust hole rises and forms high-pressure airflow, and at the moment, the high-pressure airflow at the exhaust hole enters the back pressure cavity through the pressure guide hole on the movable scroll disk; the high-pressure gas from the pressure guide hole increases the pressure of the back pressure cavity, so that back pressure is generated to make the movable scroll gradually cling to the fixed scroll. When the back pressure rises to the preset pressure, the pressure leading hole is closed, the pressure of the back pressure cavity is just in a critical balance state at the moment, namely the pressures on the two sides of the axial direction of the movable scroll disk are balanced, and therefore the stable operation of the movable scroll disk is guaranteed.

Furthermore, as the movable scroll disk continues to rotate, the pressure of the back pressure cavity also continues to rise, at the moment, high-pressure airflow of the back pressure cavity enters one side of the fixed scroll disk through the back pressure hole to gradually leak the pressure of the back pressure cavity, so that the end face of the movable scroll disk and the end face of the fixed scroll disk fall off, and at the moment, high-pressure air at the exhaust port of the pressure guide hole is opened to enter the back pressure cavity again to achieve new balance.

The movable scroll disk can enable the scroll compressor to be in a dynamic balance process all the time when the whole back pressure cavity works, the back pressure of the movable scroll disk assembly is changed along with the change of the exhaust pressure of the compressor, the end face of the movable scroll disk is tightly attached to the fixed scroll disk, the gas leakage of the end face of the scroll disk molded line is reduced, the scroll disk volume efficiency is improved, and the refrigeration performance of a product is further improved.

In an alternative embodiment, the pressure introduction hole extends in an axial direction of the orbiting scroll. The arrangement mode can enable high-pressure airflow discharged from the exhaust hole to be timely and efficiently conveyed to the back pressure cavity, so that the flow guide efficiency of the pressure guide hole is improved, and the effect of balancing the pressure of the back pressure cavity by the movable scroll disk is further ensured.

In an alternative embodiment, the pressure introduction hole has a larger diameter than the back pressure hole. The back pressure hole is only used for slightly and slowly releasing the pressure of the back pressure cavity so as to avoid overlarge pressure of the back pressure cavity, and therefore the aperture of the back pressure hole is smaller than the pressure of the pressure guide hole, so that the back pressure effect can be met while the flow guide effect of the pressure guide hole is ensured.

In an alternative embodiment, the back pressure hole is located at a side away from the pressure introduction hole in a radial direction of the orbiting scroll. The back pressure hole is only used for releasing the pressure of the back pressure hole, and the airflow of the back pressure cavity is not conveyed to the compression cavity, so that the movable scroll can be guaranteed to be capable of installing compressed gas in a preset mode. Keep away from the back pressure hole and draw the pressure hole setting, when can ensure the back pressure, avoid producing the influence to the compression effect in compression chamber.

In an alternative embodiment, an end of the pressure introduction hole is located at a start position of the orbiting scroll near a center in a radial direction of the orbiting scroll.

So make the induced pressure hole can in time high-efficiently with the high pressure of exhaust hole department water conservancy diversion to the backpressure chamber as early as possible, and such mode of setting up processing is convenient, and the effect is showing.

In an alternative embodiment, the pressure-inducing hole has a smaller diameter than the vent hole.

The arrangement mode can avoid the problem that the pressure guiding hole guides excessive air flow to the back pressure cavity to cause insufficient exhaust pressure.

In an alternative embodiment, an oil groove is further provided on an end surface of the orbiting scroll, which is far away from the fixed scroll, and the pressure guide hole penetrates through the oil groove.

The oil groove is used for accommodating lubricating agents, so that the end faces of the movable scroll disk and the fixed scroll disk can be sufficiently lubricated, the frictional resistance of the movement of the movable scroll disk is reduced, and the movable scroll disk can move more smoothly and efficiently.

In an alternative embodiment, the oil groove is provided along an extending direction of the orbiting scroll in a circumferential direction of the orbiting scroll.

The arrangement mode not only conforms to the shape structure and the extending direction of the movable scroll; and the lubricant in the oil groove can flow along with the circumferential rotation of the movable scroll disk so as to ensure the lubricating effect of the movable scroll disk.

In an alternative embodiment, the oil groove is a crescent groove.

In a second aspect, the present invention provides a backpressure structure comprising:

a fixed scroll, a front cover assembly and an orbiting scroll of any one of the preceding embodiments; the movable scroll disk and the fixed scroll disk are enclosed to form a closed compression cavity, and one side of the movable scroll disk, which is far away from the fixed scroll disk, and the front cover component are enclosed to form a closed back pressure cavity;

the pressure guide hole is used for guiding high-pressure fluid near the exhaust hole to the back pressure cavity;

the back pressure hole is used for communicating and connecting the back pressure cavity with the compression cavity so as to reduce the pressure of the back pressure cavity.

In an alternative embodiment, the backpressure structure comprises a seal assembly;

the sealing assembly is arranged between the movable scroll disc and the front cover assembly; the movable scroll plate is abutted against the sealing assembly.

The seal assembly herein has a certain amount of deformation that enables a short time seal to be formed. And a back pressure cavity is formed on the back surface of the movable vortex disc through the sealing assembly and the sealing ring.

In an alternative embodiment, the seal assembly is embedded between the front cover assembly and an end face of the fixed scroll.

In a third aspect, the present invention provides a carbon dioxide compressor comprising:

a drive assembly, a rear cover assembly and a back pressure arrangement as described in any of the previous embodiments;

the rear cover assembly is arranged on one side of the fixed scroll disc, which is far away from the movable scroll disc; the driving assembly is connected with the movable scroll disk of the backpressure structure so as to drive the movable scroll disk to make eccentric rotary motion relative to the fixed scroll disk.

The beneficial effects of the embodiment of the invention include, for example:

the pressure guiding hole of the movable scroll disk can guide high-pressure airflow to the back pressure cavity when the pressure at the exhaust hole is increased, and the high-pressure air enables the pressure of the back pressure cavity to be increased, so that the movable scroll disk gradually clings to the static scroll disk. When the back pressure rises to the preset pressure, the pressure leading hole is closed, the pressure of the back pressure cavity is just in a critical balance state at the moment, namely the pressures on the two sides of the axial direction of the movable scroll disk are balanced, and therefore the stable operation of the movable scroll disk is guaranteed. The back pressure hole can slowly release the high-pressure gas in the back pressure cavity to one side of the movable scroll disk close to the fixed scroll disk, so that the end surface of the movable scroll disk and the end surface of the fixed scroll disk fall off, and the high-pressure gas at the exhaust port of the pressure guide hole is opened to enter the back pressure cavity again to achieve new balance.

The movable scroll disk can enable the scroll compressor to be in a dynamic balance process all the time when the whole back pressure cavity works, the back pressure of the movable scroll disk assembly is changed along with the change of the exhaust pressure of the compressor, the end face of the movable scroll disk is tightly attached to the fixed scroll disk, the gas leakage of the end face of the scroll disk molded line is reduced, the scroll disk volume efficiency is improved, and the refrigeration performance of a product is further improved. Because the relatively constant dynamic and static vortex disk attaching force is obtained, the compressor can adapt to the rotating speed and the working pressure in a wider range.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural view of an orbiting scroll according to an embodiment of the present invention;

fig. 2 is a schematic structural view of another perspective of an orbiting scroll according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a carbon dioxide compressor according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of another view angle of the carbon dioxide compressor according to the embodiment of the present invention.

Icon: 100-movable scroll pan; 101-pressure guide hole; 102-back pressure hole; 103-oil groove; 110-a movable disc body; 120-orbiting scroll; 20-a backpressure structure; 200-static scroll pan; 201-vent hole; 300-a front cover assembly; 401-a compression chamber; 402-a back pressure chamber; 500-a seal assembly; 610-anti-rotation pins; 620-anti-rotation holes; 30-a carbon dioxide compressor; 31-drive assembly.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

The scroll compressor is a positive displacement compressor, and the compression component consists of a movable scroll plate and a fixed scroll.

When the orbiting scroll member is orbiting on a circular orbit while being restricted by the rotation restricting mechanism, the compression chamber moves while changing its volume, thereby performing suction, compression, and discharge, and a predetermined back pressure is applied to the outer peripheral portion of the orbiting scroll member and the back surface of the wrap by lubricating oil, thereby preventing the orbiting scroll member from falling apart from the fixed scroll member.

The carbon dioxide compressor is a compressor for pressurizing and delivering carbon dioxide gas. When carbon dioxide is used as the refrigerant, the pressure difference between the discharge pressure and the suction pressure of the compressor is about 7 to 10 times or more higher than that of a conventional refrigeration cycle using freon as the refrigerant.

However, the back pressure cavity of the existing back pressure structure is unreasonable in arrangement, so that the back pressure applied to the movable scroll is often unbalanced, and the movable scroll is overturned.

In order to improve the above technical problem, an orbiting scroll, a back pressure structure and a carbon dioxide compressor are provided in the following embodiments.

Referring to fig. 1, the embodiment provides an orbiting scroll 100 for forming a compression chamber 401 with a fixed scroll 200 and a back pressure chamber 402 with a front cover assembly 300, including an orbiting scroll body 110, an orbiting scroll 120, a pilot pressure hole 101 and a back pressure hole 102.

The movable scroll 120 is disposed on the movable disc 110;

a pressure guide hole 101 simultaneously penetrates through the movable scroll 120 and the movable disc 110, and the pressure guide hole 101 is close to the discharge hole 201 of the fixed scroll 200 to guide high-pressure fluid near the discharge hole 201 to the back pressure chamber 402;

a back pressure port 102 is provided through the movable plate body 110 to reduce the pressure in the back pressure chamber 402.

One end of a pressure introduction hole 101 of the orbiting scroll 100 of the present embodiment is connected to the compression chamber 401, and the other end of the pressure introduction hole 101 is connected to the back pressure chamber 402. When the orbiting scroll 100 starts to rotate, the orbiting scroll 100 moves relative to the fixed scroll 200 and changes the volume of the compression chamber 401, thereby achieving the purpose of compressing gas. As the orbiting scroll 100 continues to operate, the pressure of the exhaust hole 201 rises and forms a high-pressure gas flow therein, and at this time, the high-pressure gas at the exhaust hole 201 is introduced into the back pressure chamber 402 through the pressure introduction hole 101 on the orbiting scroll 100; the high pressure gas from the pressure introduction hole 101 increases the pressure of the back pressure chamber 402, thus generating a back pressure force to make the movable scroll 100 gradually abut against the fixed scroll 200. When the back pressure rises to the preset pressure, the pressure guide hole 101 is closed, and the pressure of the back pressure cavity 402 is just in a critical balance state, namely, the pressures on the two sides of the movable scroll 100 in the axial direction are balanced, so that the stable operation of the movable scroll 100 is ensured.

Further, as the movable scroll 100 continues to rotate, the pressure of the back pressure cavity 402 also continues to increase, at this time, the high-pressure gas flow of the back pressure cavity 402 enters one side of the fixed scroll 200 through the back pressure hole 102 to gradually leak the pressure of the back pressure cavity 402, so that the end surface of the movable scroll 100 falls off from the end surface of the fixed scroll 200, and at this time, the high-pressure gas at the exhaust port of the pressure introduction hole 101 is opened to reenter the back pressure cavity 402, so that the new balance is achieved.

The movable scroll 100 can enable the scroll compressor to be in a dynamic balance process all the time when the whole back pressure cavity 402 works, the back pressure of the movable scroll 100 assembly is changed along with the change of the exhaust pressure of the compressor, the end face of the movable scroll 100 is enabled to be tightly attached to the fixed scroll 200, the gas leakage of the end face of the scroll profile is reduced, the scroll volume efficiency is improved, and the refrigeration performance of the product is further improved.

With continued reference to fig. 1-4, further details of the orbiting scroll 100 will be understood.

As can be seen from the drawing, in the present embodiment, the pressure introduction hole 101 extends in the axial direction of the orbiting scroll 100. By the arrangement mode, high-pressure airflow discharged from the exhaust hole 201 can be timely and efficiently conveyed to the back pressure cavity 402, so that the flow guide efficiency of the pressure guide hole 101 is improved, and the effect of balancing the pressure of the back pressure cavity 402 by the movable scroll 100 is further ensured.

Optionally, in this embodiment, the aperture of the pressure leading hole 101 is larger than the aperture of the pressure return hole 102.

The back pressure hole 102 is only used for slightly and slowly releasing the pressure of the back pressure cavity 402 so as to avoid the excessive pressure of the back pressure cavity 402, and therefore, the diameter of the back pressure hole 102 is smaller than the pressure of the pressure guide hole 101, so that the back pressure effect can be met while the flow guiding effect of the pressure guide hole 101 is ensured.

Further, in the present embodiment of the present invention, the back pressure hole 102 is located at a side far from the pressure introduction hole 101 in the radial direction of the orbiting scroll 100. The back pressure hole 102 is only used for releasing the pressure of the back pressure hole and does not convey the airflow of the back pressure cavity 402 to the compression cavity 401, thereby ensuring that the movable scroll 100 can be installed with the preset mode for compressing the gas. The back pressure hole 102 is far away from the pressure guiding hole 101, so that the compression effect of the compression cavity 401 is prevented from being influenced while the back pressure is guaranteed.

It is not difficult to find that, in the present embodiment of the present invention, an end of the pilot hole 101 is located at a start position of the orbiting wrap 120 near the center in a radial direction of the orbiting scroll 100.

Therefore, the pressure guide hole 101 can timely and efficiently guide the high pressure at the exhaust hole 201 to the back pressure cavity 402 as soon as possible, and the arrangement mode is convenient to process and has obvious effect.

In the present embodiment, the hole diameter of the pressure introduction hole 101 is smaller than the hole diameter of the exhaust hole 201. The arrangement mode can avoid the problem that the pressure guide hole 101 guides excessive air flow to the back pressure cavity 402 to cause insufficient exhaust pressure.

As can be further seen from the figure, in the embodiment, an oil groove 103 is further provided on an end surface of the orbiting scroll 120 away from the fixed scroll 200, and the pressure guide hole 101 penetrates to the oil groove 103.

The oil groove 103 is used to accommodate lubricant, so that the end surfaces of the orbiting scroll 100 and the fixed scroll 200 can be sufficiently lubricated, and thus the frictional resistance of the movement of the orbiting scroll 100 is reduced, so that the movement of the orbiting scroll 100 is smoother and more efficient.

Alternatively, the oil groove 103 is provided along an extending direction of the orbiting scroll 120 in a circumferential direction of the orbiting scroll 120. Such an arrangement conforms to the shape and structure and the extending direction of the orbiting scroll 120; and the lubricant in the oil groove 103 can flow along with the circumferential rotation of the movable scroll 100, so as to ensure the lubricating effect of the movable scroll 100.

In the present embodiment, the oil groove 103 is a crescent groove. Namely, the oil groove 103 is a crescent-shaped sink groove.

During the use, the compressor during operation, at first exhaust hole 201 department high-pressure gas can lead pressure hole 101 through the movable disk and admit air back pressure chamber 402, and along with the pressure rise in back pressure chamber 402, the movable disk progressively pastes tight quiet dish, and finally, pressure rises after the certain degree, closes and draws pressure hole 101. At this point, the back pressure chamber 402 pressure is just at critical equilibrium.

When the pressure in the back pressure cavity 402 is gradually leaked through the gaps of the surrounding parts and the air return holes, the end surface of the movable disc and the end surface of the static disc fall off, and at the moment, the high-pressure air in the exhaust port enters the back pressure cavity 402 again to achieve new balance.

When the compressor works, the whole back pressure cavity 402 is always in a dynamic balance process, the back pressure of the movable scroll 100 assembly also changes along with the change of the exhaust pressure of the compressor, so that the end surface of the movable scroll 100 is tightly attached to the fixed scroll 200, the end surface gas leakage of the scroll profile is reduced, the scroll volume efficiency is improved, and the refrigeration performance of the product is further improved. Because the relatively constant attaching force of the dynamic and static scroll disks 200 is obtained, the compressor can adapt to the rotating speed and the working pressure in a wider range.

In a second aspect, the present invention provides a backpressure structure 20, comprising:

a fixed scroll 200, a front cover assembly 300 and the orbiting scroll 100 of any one of the previous embodiments; the movable scroll 100 and the fixed scroll 200 are enclosed to form a closed compression cavity 401, and one side of the movable scroll 100, which is far away from the fixed scroll 200, and the front cover assembly 300 are enclosed to form a closed back pressure cavity 402;

the pressure guide hole 101 is used for guiding the high-pressure fluid near the exhaust hole 201 to the back pressure cavity 402;

the back pressure hole 102 is used to communicate the back pressure chamber 402 with the compression chamber 401 to reduce the pressure of the back pressure chamber 402.

It can also be seen that in this embodiment of the invention, the backpressure device 20 includes a seal assembly 500; the sealing assembly 500 is disposed between the orbiting scroll 100 and the front cover assembly 300; the orbiting scroll 100 abuts against the sealing assembly 500.

Further, a sealing ring is arranged between the front cover assembly 300 and the rotor, and a sealing assembly 500 is arranged at the edge of the back surface of the movable scroll 100, wherein the sealing assembly 500 has a certain deformation amount and can form short-time sealing. A back pressure chamber 402 is formed at the back surface of the orbiting scroll 100 by the seal assembly 500 and the packing.

Alternatively, the sealing assembly 500 is interposed between the front cover assembly 300 and the end surface of the fixed scroll 200. The arrangement mode can further ensure the sealing effect among the front cover assembly 300, the fixed scroll 200 and the movable scroll 100, and ensure the operating efficiency of the scroll compressor.

Further, the back pressure chamber of the carbon dioxide compressor of the present embodiment needs to be specially sealed. The sealing assembly consists of a sealing structure on the movable scroll disk, an O-shaped high-pressure oil seal on the middle machine body and a sealing ring. Therefore, the device is suitable for the huge airflow pressure of the back pressure cavity, and further the stable operation of the carbon dioxide compressor is guaranteed.

As can be further seen from fig. 3 and 4, a plurality of anti-rotation pins 610 uniformly arranged in the circumferential direction are provided on the end surface of the front cover assembly 300 close to the orbiting scroll 100, and a plurality of anti-rotation holes 620 uniformly arranged in the circumferential direction are provided on the end surface of the orbiting scroll 100 close to the front cover assembly 300. The rotation preventing pins 610 are correspondingly fitted with the rotation preventing holes 620 one by one, so that the orbiting scroll 100 can be prevented from rotating about its central axis.

In a third aspect, the present invention provides a carbon dioxide compressor 30 comprising:

the drive assembly 31, the rear cover assembly and the back pressure structure 20 of any of the preceding embodiments;

the rear cover assembly is disposed at a side of the fixed scroll 200 away from the orbiting scroll 100; the driving assembly 31 is connected to the orbiting scroll 100 of the back pressure structure 20 to drive the orbiting scroll 100 to make an eccentric rotation motion with respect to the fixed scroll 200.

Optionally, the driving assembly 31 here is a rotor. The rotor is connected to the center of the orbiting scroll 100 through a balance weight, and drives the orbiting scroll 100 to make an eccentric rotation motion.

Further, a sealing ring is arranged between the front cover component 300 and the rotor, a sealing component 500 is arranged at the edge of the back face of the movable disc, and the sealing component 500 has a certain deformation amount and can form short-time sealing. A back pressure chamber 402 is formed at the back surface of the orbiting scroll 100 by the seal assembly 500 and the packing.

In summary, the embodiment of the present invention provides an orbiting scroll 100, a back pressure structure 20 and a carbon dioxide compressor 30, which have at least the following advantages:

through the cooperation of the pressure guide hole 101 and the back pressure hole, the whole back pressure cavity 402 is always in a dynamic balance process when the compressor works, the back pressure of the movable scroll 100 assembly also changes along with the change of the exhaust pressure of the compressor, the end face of the movable scroll 100 is tightly attached to the fixed scroll 200, the gas leakage of the end face of the scroll molded line is reduced, the scroll volume efficiency is improved, and the refrigeration performance of the product is further improved.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An orbiting scroll for forming a compression chamber with a fixed scroll and a back pressure chamber with a front cover assembly, comprising:

the movable disc body (110), the movable scroll (120), the pressure guide hole (101) and the back pressure hole (102); the movable scroll (120) is arranged on the movable disc body (110);

the pressure guide hole (101) penetrates through the movable scroll (120) and the movable disc body (110) at the same time, and the pressure guide hole (101) is close to a discharge hole (201) of the fixed scroll (200) so as to guide high-pressure fluid near the discharge hole (201) to the back pressure cavity (402);

the back pressure hole (102) is penetratingly arranged on the movable disc body (110) to reduce the pressure of the back pressure cavity (402).

2. The orbiting scroll of claim 1, wherein:

the pressure guide hole (101) extends in the axial direction of the orbiting scroll.

3. The orbiting scroll of claim 1, wherein:

the aperture of the pressure guide hole (101) is larger than that of the back pressure hole (102).

4. The orbiting scroll of claim 1, wherein:

the back pressure hole (102) is located on a side away from the pressure introduction hole (101) in a radial direction of the orbiting scroll.

5. The orbiting scroll of claim 1, wherein:

in the radial direction of the movable scroll, the end of the pressure introduction hole (101) is located at the start position of the movable wrap (120) near the center.

6. The orbiting scroll of claim 1, wherein:

the aperture of the pressure guide hole (101) is smaller than that of the exhaust hole (201).

7. A backpressure structure, comprising:

a fixed scroll (200), a front cover assembly (300) and an orbiting scroll according to any one of claims 1 to 6; the movable scroll and the fixed scroll (200) are enclosed to form a closed compression cavity (401), and one side of the movable scroll, which is far away from the fixed scroll (200), and the front cover assembly (300) are enclosed to form a closed back pressure cavity (402);

the pressure guide hole (101) is used for guiding high-pressure fluid near the exhaust hole (201) to the back pressure cavity (402);

the back pressure hole (102) is used for communicating the back pressure cavity (402) with the compression cavity (401) so as to reduce the pressure of the back pressure cavity (402).

8. The back pressure structure according to claim 7, wherein:

the backpressure structure comprises a seal assembly (500);

the seal assembly (500) is disposed between the orbiting scroll and the front cover assembly (300); the orbiting scroll abuts against the sealing assembly (500).

9. The back pressure structure according to claim 8, wherein:

the sealing assembly (500) is embedded between the front cover assembly (300) and the end surface of the fixed scroll (200).

10. A carbon dioxide compressor, comprising:

a drive assembly (31), a rear cover assembly and a back pressure arrangement as claimed in any of claims 7 to 9;

the rear cover assembly is arranged on one side of the fixed scroll (200) far away from the movable scroll; the driving assembly (31) is connected with the movable scroll of the backpressure structure so as to drive the movable scroll to do eccentric rotary motion relative to the fixed scroll (200).