CN107859621B

CN107859621B - Scroll compressor and air conditioner with same

Info

Publication number: CN107859621B
Application number: CN201711062819.0A
Authority: CN
Inventors: 刘韵; 康小丽; 李芳�; 单彩侠
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2017-10-31
Filing date: 2017-10-31
Publication date: 2023-10-27
Anticipated expiration: 2037-10-31
Also published as: CN107859621A

Abstract

The application provides a scroll compressor and an air conditioner with the same, wherein the scroll compressor comprises: the support forms a back pressure cavity between the support and the movable scroll, and one end of the support, which is far away from the movable scroll, is provided with a first end face; a rotating shaft rotatably passing through the bracket; and the sealing structure is in sealing connection with the rotating shaft in the circumferential direction of the rotating shaft, and the surface of the sealing structure facing one side of the bracket is in sealing connection with the first end face. The technical scheme of the application effectively solves the problem of poor sealing effect of the back pressure cavity in the prior art.

Description

Scroll compressor and air conditioner with same

Technical Field

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

Background

The scroll compressor is used as a high-efficiency energy-saving compressor, has the advantages of high energy efficiency, low noise and high reliability compared with other compressors, and is widely applied to commercial multi-connected air conditioner refrigerating systems. With the great popularization of new energy automobiles, the electric scroll compressor is newly applied to an air conditioning system of the electric automobile. The more efficient energy efficiency level, lighter structural design, and lower noise level all make the electric scroll compressor have unique advantages in electric vehicle air conditioning applications. The good pump body seal is critical to the performance and reliability of the scroll compressor, and the pump body seal principle is that a back pressure cavity is formed on the back side of the movable scroll, and the movable scroll is pushed to the fixed scroll side by means of axial gas force in the back pressure cavity, so that effective seal between pump body axes is realized.

Based on the principle of such back pressure design as described above, effective sealing of the back pressure chamber is particularly important in order to obtain a suitable back pressure. In the sealing structure for the back pressure cavity in the prior art, the axial seal between the back pressure cavity and the driving main shaft is rotary seal, and the sealing reliability requirement is higher. The shaft seal can adopt a more conventional shaft seal sealing piece when the back pressure is lower than 0.5MPa, and the shaft seal structure needs to adopt a more high-pressure-resistant complex structure when the back pressure is higher than 0.5MPa, such as a stainless steel shell and a sealing piece in the form of a PTFE component, so that the cost of the sealing piece is high, the requirement on processing and assembling size is high, and the production cost of a sample machine is increased.

Disclosure of Invention

The application aims to provide a scroll compressor and an air conditioner with the same, so as to solve the problem of poor sealing effect of a back pressure cavity in the prior art.

In order to achieve the above object, according to one aspect of the present application, there is provided a scroll compressor comprising: the support forms a back pressure cavity with the movable scroll of the scroll compressor, and one end of the support, which is far away from the movable scroll, is provided with a first end face; a rotating shaft rotatably passing through the bracket; and the sealing structure is in sealing connection with the rotating shaft in the circumferential direction of the rotating shaft, and the surface of the sealing structure facing one side of the bracket is in sealing connection with the first end face.

Further, the sealing structure includes: the annular substrate is provided with a second end surface matched with the first end surface, and the inner annular surface of the annular substrate is in sealing connection with the rotating shaft; and a seal disposed between the first end face and the second end face.

Further, at least one of the first end face and/or the second end face is provided with a ring groove, and the sealing element is arranged in the ring groove.

Further, the first end face and the second end face are arranged perpendicular to the axis of the rotating shaft.

Further, the sealing structure is provided with a pressure relief passage, the pressure relief passage is communicated with the back pressure cavity and the air suction cavity of the scroll compressor, a pressure valve is arranged in the pressure relief passage, and the pressure valve is provided with a closed position for blocking the pressure relief passage and a conducting position for avoiding the pressure relief passage.

Further, the pressure relief passage includes a first communication passage communicating with the back pressure chamber and a second communication passage communicating the first communication passage and the suction chamber, and when the pressure valve is in the closed position, the communication state of the first communication passage and the second communication passage is shut off.

Further, the first communication channel is arranged along the axial direction of the rotating shaft, and the second communication channel is arranged along the radial direction of the rotating shaft.

Further, the scroll compressor further comprises a balance block, the balance block and the annular matrix are integrally formed, and the pressure valve is arranged in the balance block.

Further, the sealing structure and the rotating shaft are integrally formed.

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

By applying the technical scheme of the application, the sealing structure is in sealing connection with the first end face of the bracket, and the original rotary axial dynamic seal is changed into rotary end face seal. Compared with the rotary axial dynamic seal, the sealing ring is arranged between the outer surface of the rotating shaft and the inner surface of the support, and the sealing structure is arranged on the first end face in the technical scheme of the application, so that even if the axis of the sealing structure deviates from the axis of the rotating shaft in the rotating process of the rotating shaft, the sealing structure can still ensure the sealing effect between the sealing structure and the first end face so as to ensure the sealing reliability of the back pressure cavity.

Drawings

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

FIG. 1 shows a schematic cross-sectional structural view of an embodiment one of a scroll compressor in accordance with the present application;

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

FIG. 3 illustrates a partially enlarged schematic view of the scroll compressor of FIG. 2 at B;

FIG. 4 illustrates a schematic view of the sealing structure and counterweight of the scroll compressor of FIG. 1 at a first angle;

FIG. 5 illustrates a schematic view of the sealing structure and counterweight of the scroll compressor of FIG. 1 at a second angle;

FIG. 6 shows a schematic cross-sectional view of the seal and counterweight of FIG. 4; and

fig. 7 is a schematic view showing a structure of a rotary shaft and a sealing structure of a second embodiment of a scroll compressor according to the present application.

Wherein the above figures include the following reference numerals:

1. an exhaust port; 2. a camera cover; 3. a fixed scroll; 4. an orbiting scroll; 5. an eccentric sleeve; 6. a bracket; 7. a sealing structure; 8. a rotating shaft; 9. a driving motor; 10. an air suction port; 11. a sub-bearing; 12. an auxiliary balance block; 13. a housing; 14. a main bearing; 15. a back pressure chamber; 16. wear-resistant gasket for back pressure cavity; 17. a movable disk drive bearing; 18. a static disc back pressure drainage passage; 19. sealing rings on the exhaust side of the static disc; 20. an oil-gas separation member; 21. a seal; 22. a pressure valve; 221. steel balls; 222. a spring; 223. a fixing member; 61. a first end face; 71. a first communication passage; 72. a second communication passage; 73. a fitting hole; 74. a ring groove; 75. an inner annulus; 76. a balance weight; 77. an outer ring end surface; 78. an inner ring end surface; 81. an outer ring end surface; 82. and a ring groove.

Detailed Description

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

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

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

Embodiment one:

as shown in fig. 1, the scroll compressor of the present embodiment includes a bracket 6, a rotation shaft 8, and a seal structure 7. Wherein, a back pressure cavity 15 is formed between the bracket 6 and the movable scroll 4, and one end of the bracket 6 away from the movable scroll 4 is provided with a first end surface 61. The rotation shaft 8 rotatably penetrates the bracket 6. The seal structure 7 is sealingly connected to the rotating shaft 8 in the circumferential direction of the rotating shaft 8, and a surface of the seal structure 7 facing the side of the holder 6 is sealingly connected to the first end surface 61. The driving motor 9 is arranged in the shell 13 to drive the rotating shaft 8 to rotate, so as to drive the eccentric sleeve 5 to eccentrically move, and the eccentric sleeve 5 drives the movable scroll 4 to eccentrically move periodically and reciprocally relative to the fixed scroll 3 through the movable disk driving bearing 17 matched with the eccentric sleeve, so that the continuous air suction, compression and exhaust processes of air are completed. In order to form shafting balance of the drive shaft, a main bearing 14 and a sub bearing 11 are concentrically and coaxially arranged at the front and rear ends of the rotary shaft 8. In order to maintain the movable scroll 4 closely attached to the fixed scroll 3 and realize the axial sealing of the compression chamber, a back pressure chamber 15 with intermediate pressure is arranged in the bracket 6 at the back of the movable scroll 4,

by applying the technical scheme of the embodiment, the sealing structure 7 is in sealing connection with the first end face 61 of the bracket 6, and the original rotary axial dynamic seal is changed into rotary end face seal. Compared with the rotary axial dynamic seal, the sealing ring is arranged between the outer surface of the rotating shaft and the inner surface of the support, and the sealing structure is arranged on the first end face 61 in the technical scheme of the application, even if the axis of the sealing structure 7 deviates from the axis of the rotating shaft 8 in the rotating process of the rotating shaft, the sealing structure 7 can still ensure the sealing effect with the first end face 61 so as to ensure the sealing reliability of the back pressure cavity 15.

Specifically, as shown in fig. 2 to 4, the seal structure 7 of the present embodiment includes an annular base body and a seal 21. Wherein the annular base has a second end surface matching with the first end surface 61, and the inner annular surface 75 of the annular base is in sealing connection with the rotating shaft 8, so that the gas in the back pressure chamber 15 cannot leak out from the gap between the annular base and the rotating shaft 8. The seal 21 is provided between the first end face 61 and the second end face to prevent gas in the back pressure chamber 15 from leaking out of the gap between the first end face 61 and the second end face.

Specifically, the sealing structure 7 and the rotating shaft 8 of the present embodiment are in interference fit on the positioning structure to realize sealing connection. The second end face is provided with a ring groove 74, and the seal 21 is provided in the ring groove 74. The sealing member 21 is always attached to the first end surface 61 in a natural state, and in practical application, an elastic member may be placed under the sealing member 21, so that the sealing member 21 maintains a certain pre-attachment force towards the first end surface 61 of the bracket 6 in a natural state. Or the seal 21 itself has some elasticity that deforms elastically when fitted between the groove 74 and the first end face 61 to maintain a certain pre-compression force with the first end face. The sealing structure designed in the way can quickly realize set pressure in the back pressure cavity when the compressor is started, and the compressor is accelerated to reach a stable running state.

In other embodiments not shown in the drawings, the annular groove may be provided on the first end surface, or on both the first end surface and the second end surface, and a seal member may be provided in a space formed by the two annular grooves to achieve sealing.

Preferably, as shown in fig. 1, the first end face 61 and the second end face of the present embodiment are disposed perpendicular to the axis of the rotary shaft 8.

Further, as shown in fig. 3 to 6, the seal structure 7 of the present embodiment has a pressure relief passage that communicates the back pressure chamber 15 and the suction chamber of the scroll compressor. The pressure relief passage is provided with a pressure valve 22, and the pressure valve 22 has a closed position blocking the pressure relief passage and a conducting position avoiding the pressure relief passage. Specifically, as shown in fig. 2 and 3, the pressure valve 22 includes a steel ball 221, a spring 222, and a fixing member 223, wherein the steel ball 221 is disposed in the pressure release passage, the fixing member 223 is disposed in the fitting hole 73 so that the steel ball 221 does not fall out of the pressure release passage, and the spring 222 is disposed between the fixing member 223 and the steel ball 221 to provide a preset pressure. When the pressure in the back pressure chamber 15 is greater than the preset pressure, the steel ball 221 moves to the communication position under the action of the pressure difference, so that the refrigerant can be discharged from the back pressure chamber 15 and flow into the suction chamber; when the pressure of the back pressure chamber 15 is reduced to a preset pressure, the steel ball 221 moves back to the closed position under the action of the spring 222, so that the back pressure chamber 15 is sealed.

Further, as shown in fig. 3, the pressure relief passage includes a first communication passage 71 communicating with the back pressure chamber 15 and a second communication passage 72 communicating the first communication passage 71 and the suction chamber, and when the pressure valve is in the closed position, the communication state of the first communication passage 71 and the second communication passage 72 is shut off. The first communication passage 71 is provided along the axial direction of the rotary shaft 8, and the second communication passage 72 is provided along the radial direction of the rotary shaft 8. Allowing the refrigerant to flow out more quickly under centrifugal action when the pressure valve 22 is opened. The design has the advantages that as the frequency of the compressor rises, the lubricating oil entering the back pressure cavity 15 through the static disc back pressure drainage passage 18 increases, the friction heat between the main bearing 14 and the movable disc drive bearing 17 in the back pressure cavity 15 is larger as the rotating speed is higher, and although more lubricating oil enters the back pressure cavity 15 to cool the bearing, if the lubricating oil in the back pressure cavity 15 cannot timely drain outwards to accelerate the oil circulation speed, the lubricating oil temperature can rise sharply, the lubricating effect can be reduced, and the long-term reliability of the compressor is necessarily affected. The pressure valve 22 structure of this embodiment not only can realize the accurate control to the back pressure chamber pressure, but also has the positive correlation with the compressor frequency and initiatively lets out the flow function simultaneously, and the frequency is bigger, and the velocity of let out is faster.

Further, as shown in fig. 5 and 6, the scroll compressor of the present embodiment further includes a weight 76, the weight 76 being integrally formed with the annular base body, and a pressure valve being provided in the weight 76. By designing the shafting weights 76 on the sealing structure 7, the compressor shafting design is made more compact, while also reducing shafting assembly processes. The weight 76 of the present embodiment is semi-circular due to the axial dimensions of the balance structure itself, facilitating the provision of the pressure valve 22 as described above.

Further, the annular groove 74 divides the second end face into the outer annular end face 77 and the inner annular end face 78, as shown in fig. 6, the outer annular end face 77 of the embodiment protrudes from the inner annular end face 78 along the axial direction of the rotating shaft 8, so that a larger gap is left between the inner annular end face 78 and the first end face 61, which is beneficial to the fluid in the back pressure chamber 15 to pass through the pressure valve 22 with smaller resistance and to be timely decompressed to the outside, so that the fluid in the back pressure chamber 15 is prevented from generating a larger pressure drop after passing through the gas passage except the pressure valve 22. The above structure enables the pressure valve 22 to control the back pressure chamber pressure more accurately.

Embodiment two:

the scroll compressor of the second embodiment is different from that of the first embodiment in the manner of connecting the rotation shaft 8 and the seal structure 7. As shown in fig. 7, the rotating shaft 8 and the sealing structure 7 of the scroll compressor of the second embodiment are integrally formed, and the rotating shaft 8 and the sealing structure 7 do not need to be in interference fit or other connection to realize sealing, so that higher assembly manufacturability is achieved on the premise of not significantly increasing the processing cost.

In the present embodiment, the first communication passage 71 of the seal structure 7 is also provided along the axial direction of the rotary shaft 8, and the second communication passage 72 is also provided along the radial direction of the rotary shaft 8. A ring groove 82 is provided on the second end face of the seal structure 7, the ring groove 82 dividing the second end face into an outer ring end face 81 and an inner ring end face, the above-described structure being similar to that of the first embodiment.

In addition, in the present embodiment, the weight structure is not integrated on the rotation shaft 8.

The present application also provides an air conditioner (not shown in the drawings) according to the present embodiment including a compressor, which is a scroll compressor having the above technical features. The air conditioner of the embodiment has the advantage of reliable sealing.

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

the sealing structure is in sealing connection with the first end face of the support, and changes the original rotary axial dynamic seal into rotary end face seal. Compared with the rotary axial dynamic seal, the sealing ring is arranged between the outer surface of the rotating shaft and the inner surface of the support, and the sealing structure is arranged on the first end face in the technical scheme of the application, so that even if the axis of the sealing structure deviates from the axis of the rotating shaft in the rotating process of the rotating shaft, the sealing structure can still ensure the sealing effect between the sealing structure and the first end face so as to ensure the sealing reliability of the back pressure cavity.

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

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

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

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

Claims

1. A scroll compressor, comprising:

a support (6), wherein a back pressure cavity (15) is formed between the support (6) and a movable scroll of the scroll compressor, and one end of the support (6) far away from the movable scroll is provided with a first end face (61);

a rotating shaft (8) rotatably passing through the bracket (6);

a sealing structure (7) which is connected with the rotating shaft (8) in a sealing way in the circumferential direction of the rotating shaft (8), and the surface of the sealing structure (7) facing to one side of the bracket (6) is connected with the first end face (61) in a sealing way;

the sealing structure (7) comprises:

an annular base body, wherein the annular base body is provided with a second end surface matched with the first end surface (61), and the inner annular surface of the annular base body is in sealing connection with the rotating shaft (8);

a seal (21) disposed between the first end face (61) and the second end face;

the sealing structure (7) is provided with a pressure relief passage, the pressure relief passage is communicated with the back pressure cavity (15) and the suction cavity of the scroll compressor, a pressure valve is arranged in the pressure relief passage, and the pressure valve is provided with a closed position for blocking the pressure relief passage and a conducting position for avoiding the pressure relief passage;

the pressure relief passage includes a first communication passage (71) communicating with the back pressure chamber (15) and a second communication passage (72) communicating the first communication passage (71) and the suction chamber, and when the pressure valve is in the closed position, a communication state of the first communication passage (71) and the second communication passage (72) is shut off;

the first communication channel (71) is arranged along the axial direction of the rotating shaft (8), and the second communication channel (72) is arranged along the radial direction of the rotating shaft (8).

2. The scroll compressor according to claim 1, wherein a ring groove is provided on at least one of the first end face (61) and/or the second end face, the seal (21) being provided in the ring groove.

3. A scroll compressor according to claim 1, wherein the first end face (61) and the second end face are arranged perpendicular to the axis of the rotating shaft (8).

4. The scroll compressor of claim 1, further comprising a counterweight (76), the counterweight (76) being integrally formed with the annular base, the pressure valve being disposed in the counterweight (76).

5. A scroll compressor according to claim 1, wherein the sealing structure (7) and the shaft (8) are integrally formed.

6. An air conditioner comprising a compressor, wherein the compressor is the scroll compressor according to any one of claims 1 to 5.