Backpressure relief structure of scroll compressor, scroll compressor and refrigeration equipment

Abstract

The utility model discloses a scroll compressor backpressure relief structure, scroll compressor and refrigeration equipment, including static scroll plate and orbiting scroll plate, a first intermediate compression chamber is formed between the outer line of static scroll wrap and the inner line of orbiting scroll wrap, a second intermediate compression chamber is formed between the inner line of static scroll wrap and the outer line of orbiting scroll wrap, the second mirror surface is provided with a first communicating hole and a second communicating hole which are not communicated, the first communicating hole is located in the first middle compression cavity, the movable scroll plate is provided with a transverse hole communicated with the first communicating hole and the second communicating hole, and the movable scroll plate is provided with a through straight-through hole on the side of the second communicating hole. The first mirror surface is provided with a sinking groove used for communicating the second communicating hole with the straight-through hole and a guide groove used for communicating the straight-through hole with the second middle compression cavity. According to the technical scheme, the backpressure cavity can be communicated with the compression cavities of the inner line and the outer line, and pressure stability is further achieved.

Description

Technical Field

[0001] The utility model is used in the field of scroll compressors, and particularly relates to a back-pressure relief structure for a scroll compressor, a scroll compressor and a refrigeration device. Background Art

[0002] The scroll compressor is characterized by small volume, high efficiency and stable operation, and is widely used in the refrigeration industry. The working principle of the scroll compressor is that through the mutual cooperation of the stationary scroll plate and the moving scroll plate, the moving scroll plate is installed on the eccentric crankshaft. Driven by the motor, the operation of the eccentric crankshaft enables the moving scroll plate to perform stable translational motion. During the motion process of the moving scroll plate, a stable continuous crescent cavity for suction, compression and exhaust is formed with the stationary scroll plate. During the operation of the scroll compressor, various pressure conditions will occur during the operation of the refrigeration system. Different pressure conditions will result in inconsistent deformation amounts of the scroll plates. To meet the application requirements of the refrigeration system, sufficient clearance needs to be ensured between the scroll teeth of the moving scroll plate and the stationary scroll plate to avoid wear of the scroll teeth caused by the deformation of the scroll plates. However, for the clearance between the scroll teeth, internal leakage between the scroll compression cavities will inevitably occur. To solve the problem of internal leakage, the industry's approach is to adjust the clearance by floating the moving scroll plate or the stationary scroll plate. Among the technical solutions using the floating of the moving scroll plate, the conventional method in the industry is to drill a small through hole on the end plate of the moving scroll plate to directly connect the intermediate compression cavity with the back-pressure cavity of the moving scroll plate, or to design a transverse hole on the end plate of the moving scroll plate to intermittently communicate with the back-pressure cavity through cooperation with the mirror surface of the stationary scroll plate, so that the pressure on the back of the moving scroll plate is the same as the pressure in the intermediate compression cavity. The gas in the cavity on the back of the moving scroll plate lifts the moving scroll plate during the motion process of the moving scroll plate, realizing the floating of the moving scroll plate.

[0003] At present, there are two forms of the scroll lines of the scroll plate. One is the symmetric scroll line, which is characterized by simple design and the same volume of the compression cavities formed by the inner and outer lines, but has low space utilization rate of the scroll plate. The other is the asymmetric scroll line. By effectively utilizing the space of the scroll plate and extending the scroll line to increase the suction volume, the suction cavity volumes formed by the inner and outer lines of the scroll line are inconsistent, and the design difficulty increases. However, it can make full use of the space of the scroll plate to maximize the displacement, and it is the most widely used scroll line in the industry at present.

[0004] The solution of drilling a straight through-hole or a transverse hole in the moving scroll disk can only connect the inner or outer compression chambers. For symmetric scroll lines, it can basically meet the usage requirements. However, for the solution of asymmetric scroll lines, since the volumes of the suction chambers formed by the inner and outer lines are inconsistent, and the pressures in the chambers between the inner and outer lines are also different at the same rotation angle, a single through-hole and transverse hole cannot balance the pressure difference between the inner and outer lines, resulting in a large pressure pulsation in the intermediate pressure chamber on the back surface of the moving scroll disk, reducing the motion stability of the moving scroll disk. Especially under the operating conditions of low rotational speed, the motion of the scroll disk is unstable, which will lead to uneven gaps between the scroll teeth, increased internal leakage, and decreased energy efficiency of the compressor. Another problem is that the unstable motion of the scroll disk directly causes contact wear of the scroll disk, reducing the reliability of the scroll compressor.

[0005] There are also cases where two straight through-holes or two transverse holes are implemented for asymmetric scroll lines to connect the back pressure chamber to two intermediate pressure chambers. However, the straight through-hole and the transverse hole have their own defects. Since the straight through-hole is directly connected to the back pressure chamber, the pressure response in the back pressure chamber is rapid, with large pressure pulsations, reducing the motion stability of the scroll disk, resulting in unstable fitting gaps of the scroll disk, forming local contacts, and increasing the operating power of the compressor, with an actual increase of about 3%. The transverse hole forms an intermittent connection with the mirror surface of the stationary scroll disk, which reduces the pressure pulsation in the back pressure chamber to a certain extent. However, the intermittent fitting leads to the inability to provide sufficient lubricating oil to the mirror surface in a timely manner under the operating conditions of high temperature and high pressure ratio, easily forming local sintering wear on the mirror surface and reducing the reliability of the scroll compressor. Summary of the Utility Model

[0006] The purpose of the present utility model is to solve at least one of the technical problems existing in the prior art, and to provide a back pressure relief structure for a scroll compressor, a scroll compressor, and a refrigeration device.

[0007] The technical solution adopted by the present utility model to solve its technical problems is:

[0008] In a first aspect, a back-pressure relief structure for a scroll compressor includes a stationary scroll plate and a moving scroll plate. The stationary scroll plate has a first mirror surface and stationary scroll teeth provided on the first mirror surface. The moving scroll plate has a second mirror surface and moving scroll teeth provided on the second mirror surface. The stationary scroll plate and the moving scroll plate cooperate with each other. A first intermediate compression chamber is formed between the outer line of the stationary scroll teeth and the inner line of the moving scroll teeth, and a second intermediate compression chamber is formed between the inner line of the stationary scroll teeth and the outer line of the moving scroll teeth. The second mirror surface is provided with a non-through first communication hole and a second communication hole. The first communication hole is located in the first intermediate compression chamber. The moving scroll plate is provided with a transverse hole communicating the first communication hole and the second communication hole. The moving scroll plate is provided with a through straight through hole on the side of the second communication hole. The first mirror surface is provided with a sunk groove for communicating the second communication hole with the straight through hole and a guide groove for communicating the straight through hole with the second intermediate compression chamber.

[0009] Combined with the first aspect, in some implementation manners of the first aspect, the second communication hole is closer to the edge of the moving scroll plate than the first communication hole.

[0010] Combined with the first aspect and the above implementation manners, in some implementation manners of the first aspect, the sunk groove forms an oil storage groove on the first mirror surface.

[0011] Combined with the first aspect and the above implementation manners, in some implementation manners of the first aspect, the sunk groove has a wall surface extending from the first mirror surface to the back side of the stationary scroll plate, and the wall surface continuously extends along the circumferential direction of the sunk groove to form the oil storage groove.

[0012] Combined with the first aspect and the above implementation manners, in some implementation manners of the first aspect, when the sunk groove communicates the second communication hole with the straight through hole, the guide groove is offset from the straight through hole, and when the guide groove communicates the straight through hole with the second intermediate compression chamber, the sunk groove is offset from the second communication hole and / or the straight through hole.

[0013] Combined with the first aspect and the above implementation manners, in some implementation manners of the first aspect, the moving scroll teeth adopt an asymmetric scroll line.

[0014] Combined with the first aspect and the above implementation manners, in some implementation manners of the first aspect, the stationary scroll plate has an air inlet, and the sunk groove is located on the side of the air inlet.

[0015] Combined with the first aspect and the above implementation manners, in some implementation manners of the first aspect, the first communication hole is located inside the inner line of the moving scroll teeth, and the transverse hole extends along the radial direction of the moving scroll plate.

[0016] In a second aspect, a scroll compressor includes the scroll compressor back-pressure relief structure described in any of the implementation manners of the first aspect.

[0017] In a third aspect, a refrigeration device includes the scroll compressor described in any of the implementation manners of the second aspect.

[0018] At least one of the technical solutions in the above technical solutions has the following advantages or beneficial effects: The technical solution of the present utility model simultaneously adopts the structures of straight through-holes and transverse holes. During the meshing process of the stationary scroll plate and the moving scroll plate, the straight through-holes and the transverse holes alternately and intermittently conduct the back-pressure chamber and the intermediate compression chamber. Among them, the straight through-holes and the transverse holes are jointly used to conduct the back-pressure chamber and the first intermediate compression chamber, that is, when the second communication hole and the straight through-hole of the moving scroll plate move to the position of the sinking groove and are connected through the sinking groove, the back-pressure chamber is sequentially conducted with the first intermediate compression chamber through the straight through-hole, the sinking groove, the second communication hole, the transverse hole, and the first communication hole. And the straight through-hole can also be used to conduct the back-pressure chamber and the second intermediate compression chamber, that is, when the straight through-hole of the moving scroll plate moves to the position of the guiding groove, the back-pressure chamber is sequentially conducted with the second intermediate compression chamber through the straight through-hole and the guiding groove. In this way, the technical solution of the present utility model can realize the connection between the back-pressure chamber and the compression chambers of the inner line and the outer line, and further realize the pressure stability.

[0019] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0021] Figure 1 is a schematic structural diagram of an embodiment of the moving scroll plate of the present utility model;

[0022] Figure 2 is a schematic structural diagram of an embodiment of the stationary scroll plate of the present utility model;

[0023] Figure 3 is a schematic plan view of the connection state between the first intermediate compression chamber and the back-pressure chamber in an embodiment of the present utility model;

[0024] Figure 4 is a schematic plan view of the connection state between the second intermediate compression chamber and the back-pressure chamber in an embodiment of the present utility model;

[0025] Figure 5 is a schematic elevation view of the connection state between the first intermediate compression chamber and the back-pressure chamber in an embodiment of the present utility model;

[0026] Figure 6It is an elevation schematic diagram of the communication state between the second intermediate compression chamber and the back pressure chamber in an embodiment of the present utility model. Specific embodiments

[0027] This part will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the drawings. The role of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but it cannot be understood as a limitation on the protection scope of the present utility model.

[0028] In the present utility model, if there is a description of directions (up, down, left, right, front, and back), it is only for the convenience of describing the technical solution of the present utility model, rather than indicating or implying that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model.

[0029] In the present utility model, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and "greater than", "less than", "exceeding", etc. are understood as not including the present number; "above", "below", "within", etc. are understood as including the present number. In the description of the present utility model, if there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0030] In the present utility model, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense. For example, they can be directly connected, or indirectly connected through an intermediate medium; they can be fixedly connected, or detachably connected, and can also be integrally formed; they can be mechanically connected, or electrically connected or capable of communicating with each other; they can be the communication inside two components or the interaction relationship between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in the present utility model in combination with the specific content of the technical solution.

[0031] See Figures 1-6, an embodiment of the present utility model provides a back pressure relief structure for a scroll compressor, which includes a stationary scroll plate 100 and a moving scroll plate 200. The stationary scroll plate 100 has a first mirror surface 101 and stationary scroll teeth 102 provided on the first mirror surface 101. The moving scroll plate 200 has a second mirror surface 201 and moving scroll teeth 202 provided on the second mirror surface 201. The first mirror surface 101 of the stationary scroll plate 100 faces the second mirror surface 201 of the moving scroll plate 200. The stationary scroll plate 100 and the moving scroll plate 200 cooperate with each other. A first intermediate compression chamber 300 is formed between the outer line of the stationary scroll teeth 102 and the inner line of the moving scroll teeth 202, and a second intermediate compression chamber 400 is formed between the inner line of the stationary scroll teeth 102 and the outer line of the moving scroll teeth 202. The second mirror surface 201 is provided with a non-through first communication hole 203 and a second communication hole 204. The first communication hole 203 and the second communication hole 204 extend from the second mirror surface 201 towards the back side of the moving scroll plate 200 and stop before reaching the back side surface. The first communication hole 203 is located in the first intermediate compression chamber 300. The moving scroll plate 200 is provided with a transverse hole 205 that communicates the first communication hole 203 and the second communication hole 204. The moving scroll plate 200 is provided with a through straight through hole 206 on the side of the second communication hole 204. The first mirror surface 101 is provided with a sinking groove 103 for communicating the second communication hole 204 with the straight through hole 206 and a guide groove 104 for communicating the straight through hole 206 with the second intermediate compression chamber 400.

[0032] The technical solution of the present utility model adopts the structures of the straight through hole 206 and the transverse hole 205 at the same time. During the meshing process of the stationary scroll plate 100 and the moving scroll plate 200, the straight through hole 206 and the transverse hole 205 alternately and intermittently conduct the back pressure chamber and the intermediate compression chamber. Among them, the straight through hole 206 and the transverse hole 205 are jointly used to conduct the back pressure chamber and the first intermediate compression chamber 300. That is, when the second communication hole 204 and the straight through hole 206 of the moving scroll plate 200 move to the position of the sinking groove 103 and are connected through the sinking groove 103, the back pressure chamber is sequentially conducted with the first intermediate compression chamber 300 through the straight through hole 206, the sinking groove 103, the second communication hole 204, the transverse hole 205 and the first communication hole 203. And the straight through hole 206 can also be used to conduct the back pressure chamber and the second intermediate compression chamber 400. That is, when the straight through hole 206 of the moving scroll plate 200 moves to the position of the guide groove 104, the back pressure chamber is sequentially conducted with the second intermediate compression chamber through the straight through hole 206 and the guide groove 104. In this way, the technical solution of the present utility model can realize that the back pressure chamber can be connected with both the compression chambers of the inner line and the outer line, and further realize the stability of the pressure.

[0033] The technical solution of the present utility model is simple to process. It only needs to add straight through holes 206 to the end plate of the moving scroll disk 200 and add a sunk groove 103 communicating with the intermediate compression cavity to the mirror surface of the stationary scroll disk 100, so that the back pressure cavity can communicate with both intermediate compression cavities, effectively reducing the pressure pulsation in the back pressure cavity, improving the movement stability of the moving scroll disk 200, reducing the leakage between scrolls, improving the performance of the compressor at low rotational speeds, and improving the reliability of the scroll compressor due to the stable operation.

[0034] In some embodiments, referring to Figure 1 , the second communication hole 204 is closer to the edge of the moving scroll disk 200 than the first communication hole 203, that is, the second communication hole 204 is away from the mating area of the stationary scroll tooth 102 and the moving scroll tooth 202, which is convenient for the arrangement and processing of the sunk groove 103 and the guide groove 104 on the stationary scroll disk 100.

[0035] In some embodiments, the sunk groove 103 forms an oil storage groove on the first mirror surface 101. In this embodiment, the sunk groove 103 is used as a buffer cavity between the intermediate compression cavity and the back pressure cavity, which can not only further reduce the pressure pulsation, but also serve as an oil storage structure to improve the lubrication of the mirror surface. By buffering the pressure and storing the lubricating oil, the stability and reliability of the scroll disk movement can be ensured under high pressure ratio conditions, enabling the scroll compressor to operate stably regardless of low or high pressure ratios.

[0036] Among them, referring to Figure 2 , for better buffering and oil storage, the sunk groove 103 has a wall surface extending from the first mirror surface 101 to the back side of the stationary scroll disk 100, and the wall surface continuously extends along the circumference of the sunk groove 103 to form an oil storage groove with an opening on the first mirror surface.

[0037] In some embodiments, in combination with Figures 3-6 , when the sunk groove 103 communicates the second communication hole 204 with the straight through hole 206, the guide groove 104 is offset from the straight through hole 206. When the guide groove 104 communicates the straight through hole 206 with the second intermediate compression cavity 400, the sunk groove 103 is offset from the second communication hole 204 and / or the straight through hole 206.

[0038] In the embodiment of the present utility model, while a transverse hole 205 is provided in the compression cavity formed by the inner line of the moving scroll disk 200 and the outer line of the stationary scroll disk 100, a guide groove 104 is provided on the mirror surface of the stationary scroll disk 100 to communicate the compression cavity formed by the outer line of the moving scroll disk 200 and the inner line of the stationary scroll disk 100. The straight through hole 206 of the moving scroll disk 200 will intermittently communicate with the guide groove 104. By adding this guide groove 104, the back pressure cavity can communicate with both the inner and outer compression cavities, further achieving pressure stability.

[0039] In some embodiments, the moving scroll tooth 202 adopts an asymmetric scroll line. In view of the characteristic that the pressures of the inner and outer lines of the asymmetric scroll line are inconsistent, the embodiments of the present utility model can achieve that the back pressure chamber communicates with both the compression chambers of the inner and outer lines, further realizing the pressure stability.

[0040] In some embodiments, referring to Figure 2 , the stationary scroll disk 100 has an air inlet 105. The sunken groove 103 is located on the side of the air inlet 105. The first mirror surface 101 of the stationary scroll disk 100 does not arrange the stationary scroll tooth 102 at the side position of the air inlet 105. Setting the sunken groove 103 at the side of the air inlet 105 can facilitate the arrangement and processing of the sunken groove 103, the guide groove 104 and the straight through hole 206 cooperating with them.

[0041] Referring to Figure 1 , the first communication hole 203 is located inside the inner line of the moving scroll tooth 202. The transverse hole 205 is a blind hole opened from the outer wall surface of the moving scroll tooth 202 to the inside. The transverse hole 205 extends along the radial direction of the scroll disk 200 and communicates the first communication hole 203 and the second communication hole 204. The outer port of the transverse hole 205 is blocked by a plug.

[0042] The embodiments of the present utility model further provide a scroll compressor, including the scroll compressor back pressure relief structure in any of the above embodiments.

[0043] The embodiments of the present utility model further provide a refrigeration device, including the scroll compressor in any of the above embodiments.

[0044] In the description of this specification, the descriptions referring to the terms "example", "embodiment" or "some embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0045] Certainly, the present invention is not limited to the above embodiments. Those skilled in the art can make equivalent deformations or substitutions without departing from the spirit of the present utility model, and these equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A backpressure relief structure for a scroll compressor, characterized in that, It includes a stationary scroll plate and a rotating scroll plate. The stationary scroll plate has a first mirror surface and stationary scroll teeth provided on the first mirror surface. The rotating scroll plate has a second mirror surface and rotating scroll teeth provided on the second mirror surface. The stationary scroll plate and the rotating scroll plate cooperate with each other. A first intermediate compression chamber is formed between the outer line of the stationary scroll teeth and the inner line of the rotating scroll teeth, and a second intermediate compression chamber is formed between the inner line of the stationary scroll teeth and the outer line of the rotating scroll teeth. The second mirror surface is provided with a non-through first communication hole and a second communication hole. The first communication hole is located in the first intermediate compression chamber. The rotating scroll plate is provided with a transverse hole communicating the first communication hole and the second communication hole. The rotating scroll plate is provided with a through straight through hole on the side of the second communication hole. The first mirror surface is provided with a sink for communicating the second communication hole and the straight through hole and a guide groove for communicating the straight through hole and the second intermediate compression chamber.

2. The back-pressure relief structure of the scroll compressor according to claim 1, characterized in that, The second communication hole is closer to the edge of the rotating scroll plate than the first communication hole.

3. The back-pressure relief structure of the scroll compressor according to claim 1, characterized in that, The sink forms an oil storage groove on the first mirror surface.

4. The back-pressure relief structure of the scroll compressor according to claim 3, wherein, The sink has a wall surface extending from the first mirror surface to the back side of the stationary scroll plate, and the wall surface continuously extends along the circumference of the sink to form the oil storage groove.

5. The back-pressure relief structure of the scroll compressor according to claim 1, characterized in that When the sink communicates the second communication hole and the straight through hole, the guide groove is staggered from the straight through hole. When the guide groove communicates the straight through hole and the second intermediate compression chamber, the sink is staggered from the second communication hole and / or the straight through hole.

6. The backpressure relief structure of the scroll compressor according to claim 1, characterized in that, The rotating scroll teeth adopt an asymmetric scroll line.

7. The backpressure relief structure of the scroll compressor according to claim 1, characterized in that, The stationary scroll plate has an air inlet, and the sink is located on the side of the air inlet.

8. The backpressure relief structure of the scroll compressor according to claim 1, wherein The first communication hole is located inside the inner line of the rotating scroll teeth, and the transverse hole extends along the radial direction of the rotating scroll plate.

9. A scroll compressor, characterized in that, It includes the back pressure relief structure of the scroll compressor according to any one of claims 1 to 8.

10. A refrigeration device, characterized in that, It includes the scroll compressor according to claim 9.

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