Compressor exhaust structure and compressor

Abstract

The compressor exhaust structure comprises a flange, a first groove is formed in the flange, a through hole is formed in the groove bottom of the first groove, the through hole communicates with an exhaust hole of the compressor, a valve body is arranged in the first groove, an exhaust channel is formed in the first groove, and the valve body communicates with the exhaust channel. The valve body is used for opening or closing the through hole so that the exhaust channel can be communicated with or disconnected from the through hole, the flange is further provided with a valve deck, the valve deck and the valve body are oppositely arranged, the valve deck is provided with a backpressure hole, a limiting structure is arranged in the first groove, and the limiting structure is arranged in the axial direction of the flange. And the limiting structure is used for limiting the valve body. According to the reed valve, the technical problem that in the prior art, a reed valve of a rotor compressor is prone to concave bending deformation, stress concentration and the like, and consequently the valve plate is broken can be solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of compressors, and particularly relates to a compressor exhaust structure and a compressor. Background Art

[0002] Scroll compressors have the advantages of high efficiency and low cost. With the development of market demand and the R & D technology of rotary compressors, the displacement of rotary compressors has been extended to more than 100 cc. Due to the high requirements of air-conditioning systems for cost and performance, there is a strong demand for the development of rotary compressors with larger displacements. In the design of compressors with extreme displacements on the existing largest series, it is found that the conventional double-rotor compressor structure can no longer meet the design requirements of large-displacement compressors. The existing 80-cc displacement compressor of our company adopts a double-diaphragm design. By increasing the intermediate diaphragm cavity, double exhausts of a single cylinder are realized, and four exhausts of a double rotor are used to increase the displacement of the compressor. If the displacement is further expanded on this basis, only the cylinder height can be further increased and the exhaust port can be enlarged. Among them, increasing the cylinder height will further increase the bearing span and the length of the rotating inertia arm, resulting in large forces on the corresponding crankshaft and bearings and a high risk of wear, making it difficult to ensure the reliability of the compressor. Second, for the scheme of enlarging the exhaust port, research on large-rotor compressors in the industry has found that when the exhaust port is enlarged to more than φ13, the head of the conventional tongue reed valve is prone to concave deformation and stress concentration, resulting in valve plate fracture and compressor failure problems.

[0003] Due to the problems such as concave deformation and stress concentration that easily occur in the tongue reed valve of the rotary compressor in the prior art, resulting in technical problems such as valve plate fracture, the present invention researches and designs a compressor exhaust structure and a compressor. Summary of the Invention

[0004] Therefore, the present invention provides a compressor exhaust structure and a compressor, which can solve the technical problems that the tongue reed valve of the rotary compressor in the prior art is prone to concave deformation, stress concentration and other conditions, resulting in valve plate fracture.

[0005] To solve the above problems, the present invention provides a compressor exhaust structure, including: a flange, on which a first groove is provided, a through hole is provided at the bottom of the first groove, the through hole is communicated with the exhaust hole of the compressor, a valve body is arranged in the first groove, an exhaust passage is provided on the first groove, the valve body is used to open or close the through hole so that the exhaust passage is communicated with or disconnected from the through hole, a valve cover is further provided on the flange, the valve cover is arranged opposite to the valve body, a back pressure hole is provided on the valve cover, and a limiting structure is arranged in the first groove. Along the axial direction of the flange, the limiting structure is used to limit the valve body.

[0006] In some embodiments, the exhaust passage includes a third groove provided on the flange. The bottom of the third groove and the bottom of the first groove are in the same plane. Along the circumferential direction of the third groove, at least part of the side wall of the third groove communicates with the first groove; And / or, the exhaust passage includes a fourth groove provided on the flange. The bottom of the fourth groove and the bottom of the first groove are in the same plane. Along the circumferential direction of the fourth groove, at least part of the side wall of the fourth groove communicates with the first groove.

[0007] In some embodiments, the first groove matches the valve body, and the first groove and the valve body cooperate to form the limiting structure so that the valve body moves along the axial direction of the flange.

[0008] In some embodiments, a plurality of second grooves are provided on the flange. The depth of the second groove is less than the depth of the first groove. Along the circumferential direction of the first groove, at least part of the side wall of the second groove communicates with the first groove. The valve cover is provided with fixing holes and fixing members. After passing through the fixing holes, the fixing members are fixed to the bottom of the second groove.

[0009] In some embodiments, along the axial direction of the flange, there is a first distance between the bottom of the second groove and the bottom of the first groove, and the height of the valve body is less than the first distance.

[0010] In some embodiments, the diameter of the valve body is less than the diameter of the first groove, and a protrusion is provided on the side of the valve cover facing the valve body. The protrusion is located between the valve cover and the side wall of the first groove. The cooperation between the protrusion and the valve body forms the limiting structure.

[0011] In some embodiments, the protrusion is annular, at least part of the valve body is located inside the protrusion. Along the axial direction of the flange, there is a second distance between the side of the valve cover close to the valve body and the bottom of the first groove, and the second distance is greater than the height of the valve body.

[0012] In some embodiments, the valve cover and the valve body are connected by an elastic member. Along the axial direction of the flange, the elastic member has an opening. One end of the opening communicates with the back pressure hole, and the other end of the opening is connected to the valve body.

[0013] In some embodiments, a positioning pin is provided on the valve body, and a positioning hole is provided on the valve cover. Along the axial direction of the flange, the positioning pin can move in the positioning hole to form the limiting structure.

[0014] In some embodiments, a fifth groove is provided at one end of the valve body facing the valve cover, and the fifth groove is arranged opposite to the back pressure hole.

[0015] In some embodiments, the depth of the first groove is H, the height of the valve body is h, the height of the positioning pin is h0, and the depth of the positioning hole is h2, which satisfy H - h2 - h < h0 < h2.

[0016] In some embodiments, the diameter of the through hole is D, and the minimum cross-sectional area of the exhaust passage is S, which satisfy S ≥ 0.25πD*D.

[0017] The present invention also provides a compressor, which includes the aforementioned compressor exhaust structure.

[0018] A compressor exhaust structure and a compressor provided by the present invention have the following beneficial effects: By providing a first groove on the flange, the first groove is connected to the exhaust hole on the cylinder of the compressor through a through hole. A valve body is arranged in the first groove, and the valve body can move along the axial direction of the flange. A valve cover is arranged on the flange, and the valve cover is arranged opposite to the valve body. The valve cover prevents the valve body from sliding out of the first groove. The limiting structure further ensures that the valve body moves along the axial direction of the flange in the first groove. A back pressure hole is arranged on the valve cover, and the back pressure hole is arranged opposite to the valve body, so that the valve body can move under the pressure difference between the air pressure in the compressor cylinder and the air pressure in the compressor housing. When the air pressure in the compressor cylinder is greater than the air pressure in the compressor housing, the valve body moves upward under the action of the air pressure in the compressor cylinder. At this time, the through hole is opened, and the gas in the cylinder is discharged through the through hole and the exhaust passage. When the air pressure in the compressor cylinder is less than the air pressure in the compressor housing, the valve body moves downward under the action of the air pressure in the compressor housing, thereby closing the through hole and disconnecting the through hole and the exhaust passage. The compressor exhaust structure of the present invention is not limited by the size of the exhaust port. By providing a sufficiently large exhaust port on the flange to meet the compressor capacity requirements, single-cylinder single-exhaust and double-cylinder double-exhaust can be achieved. The problem of poor reliability of the compressor caused by the fracture of the exhaust valve can be avoided. At the same time, the partition cavity can be reduced or even eliminated, the bearing span can be effectively reduced, and the reliability of the large-rotor compressor can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. The drawings in the following description are only exemplary. For those of ordinary skill in the art, other implementation drawings can be obtained according to the provided drawings without creative efforts.

[0020] Figure 1 is the assembly structure diagram of the compressor exhaust structure of the present invention; Figure 2 It is a partial enlarged view of the exhaust state of the compressor exhaust structure of the present invention; Figure 3 It is a partial enlarged view of the non-exhaust state of the compressor exhaust structure of the present invention; Figure 4 It is an exploded view of the compressor exhaust structure of the present invention; Figure 5 It is a schematic structural diagram of the flange in the compressor exhaust structure of the present invention; Figure 6 It is a schematic structural diagram of the compressor exhaust structure of the present invention; Figure 7 It is a schematic structural diagram of the middle valve body of the compressor exhaust structure of the present invention; Figure 8 It is a schematic structural diagram of the middle valve cover of the compressor exhaust structure of the present invention; Figure 9 It is an assembly structural diagram of the compressor exhaust structure of the second embodiment of the present invention; Figure 10 It is an exploded view of the compressor exhaust structure of the second embodiment of the present invention; Figure 11 It is a schematic structural diagram of the middle flange of the compressor exhaust structure of the second embodiment of the present invention; Figure 12 It is a schematic structural diagram of the compressor exhaust structure of the second embodiment of the present invention; Figure 13 It is a schematic structural diagram of the middle valve cover of the compressor exhaust structure of the second embodiment of the present invention; Figure 14 It is a partial enlarged view of the exhaust state of the compressor exhaust structure of the third embodiment of the present invention; Figure 15 It is a partial enlarged view of the non-exhaust state of the compressor exhaust structure of the third embodiment of the present invention; Figure 16 It is an exploded view of the compressor exhaust structure of the third embodiment of the present invention; Figure 17 It is a schematic structural diagram of the middle flange of the compressor exhaust structure of the third embodiment of the present invention; Figure 18 It is a partial enlarged view of the compressor exhaust structure of the third embodiment of the present invention; Figure 19 It is a schematic structural diagram of the middle valve body of the compressor exhaust structure of the third embodiment of the present invention; Figure 20 It is a schematic structural diagram of the middle valve cover of the compressor exhaust structure of the third embodiment of the present invention.

[0021] The reference numerals are: 1. Cylinder; 2. Flange; 3. Exhaust hole; 4. Valve body; 5. Valve cover; 6. Through hole; 7. Back pressure hole; 8. First groove; 9. Second groove; 10. Fixing hole; 11. Fixing part; 12. Third groove; 13. Fourth groove; 14. Positioning hole; 15. Fifth groove; 16. Positioning pin; 17. Protrusion. Detailed implementation mode

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is merely illustrative and in no way restrictive of the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0024] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" can be used here to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure of the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientation of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding explanations are made for the spatial relative descriptions used here.

[0025] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without further declaration, the above terms have no special meaning, so it should not be construed as a limitation on the protection scope of the present invention.

[0026] Referring to Figure 1-20 As shown, according to an embodiment of the present invention, a compressor exhaust structure is provided, including: a flange 2, a first groove 8 is provided on the flange 2, a through hole 6 is provided at the bottom of the first groove 8, the through hole 6 is communicated with the exhaust hole 3 of the compressor, a valve body 4 is provided in the first groove 8, an exhaust passage is provided on the first groove 8, the valve body 4 is used to open or close the through hole 6 so that the exhaust passage is communicated with or disconnected from the through hole 6, a valve cover 5 is further provided on the flange 2, the valve cover 5 is arranged opposite to the valve body 4, a back pressure hole 7 is provided on the valve cover 5, and a limiting structure is provided in the first groove 8. Along the axial direction of the flange 2, the limiting structure is used to limit the valve body 4. In this technical solution, by providing a first groove 8 on the flange 2, the first groove 8 is communicated with the exhaust hole 3 on the cylinder 1 of the compressor through the through hole 6. A valve body 4 is provided in the first groove 8, and the valve body 4 can move along the axial direction of the flange 2. A valve cover 5 is provided on the flange 2, and the valve cover 5 is arranged opposite to the valve body 4. The valve cover 5 is used to prevent the valve body 4 from sliding out of the first groove 8. The limiting structure further ensures that the valve body 4 moves along the axial direction of the flange 2 in the first groove 8. A back pressure hole 7 is provided on the valve cover 5, and the back pressure hole 7 is arranged opposite to the valve body 4, so that the valve body 4 can move under the pressure difference between the air pressure in the compressor cylinder 1 and the air pressure in the compressor housing. When the air pressure in the compressor cylinder 1 is greater than the air pressure in the compressor housing, the valve body 4 moves upward under the action of the air pressure in the compressor cylinder 1. At this time, the through hole 6 is opened, and the gas in the cylinder 1 is discharged through the through hole 6 and the exhaust passage. When the air pressure in the compressor cylinder 1 is less than the air pressure in the compressor housing, the valve body 4 moves downward under the action of the air pressure in the compressor housing, thereby closing the through hole 6 and disconnecting the through hole 6 and the exhaust passage. It should be noted that if the flange 2 is the upper flange of the compressor, when exhausting, the valve body 4 moves upward, and when closing the through hole 6, the valve body 4 moves downward. If the flange 2 is the lower flange of the compressor, when exhausting, the valve body 4 moves downward, and when closing the through hole 6, the valve body 4 moves upward. The compressor exhaust structure of the present invention is not limited by the size of the exhaust port. By providing a sufficiently large exhaust port on the flange 2 to meet the compressor capacity requirements, single-cylinder single-exhaust and double-cylinder double-exhaust are realized, the problem of poor reliability of the compressor caused by the fracture of the exhaust valve can be avoided, and at the same time, the partition chamber can be reduced or even eliminated, which can effectively reduce the bearing span and improve the reliability of the large-rotor compressor. Further, the through hole 6 is smaller than the diameter of the valve body 4, and the valve body 4 is not larger than the diameter of the first groove 8.

[0027] In some embodiments, the exhaust passage includes a third groove 12 provided on the flange 2. The bottom of the third groove 12 and the bottom of the first groove 8 are in the same plane. Along the circumferential direction of the third groove 12, at least part of the side wall of the third groove 12 communicates with the first groove 8; And / or, the exhaust passage includes a fourth groove 13 provided on the flange 2. The bottom of the fourth groove 13 and the bottom of the first groove 8 are in the same plane. Along the circumferential direction of the fourth groove 13, at least part of the side wall of the fourth groove 13 communicates with the first groove 8.

[0028] In this technical solution, the exhaust passage is formed by the fourth groove 13 and / or the third groove 12. The bottom of the fourth groove 13 and / or the third groove 12 is in the same plane as the bottom of the first groove 8. When the valve body 4 moves upward, the gas discharged from the through hole 6 enters the fourth groove 13 and / or the third groove 12, and then is discharged from the notch of the fourth groove !3 and / or the third groove 12.

[0029] In some embodiments, the first groove 8 matches the valve body 4, and the first groove 8 and the valve body 4 cooperate to form the limiting structure so that the valve body 4 moves along the axial direction of the flange 2.

[0030] In this technical solution, by matching the first groove 8 with the valve body 4, that is to say, the side wall of the first groove 8 can limit and guide the axial movement of the valve body 4 to ensure the normal movement of the valve body 4. Preferably, a clearance fit is adopted between the first groove 8 and the valve body 4.

[0031] In some embodiments, the first groove 8, the third groove 12, and the fourth groove 13 are all provided on the top surface of the flange 2, and the bottom surface of the flange 2 faces the cylinder 1. It should be noted that the first groove 8, the third groove 12, and the fourth groove 13 are completely communicated along the axial direction of the flange 2. Along the radial direction of the flange 2, the third groove 12 is located on one side of the first groove 8, and the fourth groove 13 is located on the other side of the first groove 8.

[0032] In some embodiments, a plurality of second grooves 9 are provided on the flange 2. The groove depth of the second grooves 9 is less than the groove depth of the first groove 8. Along the circumferential direction of the first groove 8, at least part of the side wall of the second grooves 9 communicates with the first groove 8. Fixing holes 10 and fixing members 11 are provided on the valve cover 5, and the fixing members 11 are fixed to the bottom of the second grooves 9 after passing through the fixing holes 10.

[0033] In this technical solution, preferably, there are two second grooves 9. Correspondingly, there are also two fixing holes 10 and two fixing members 11 respectively. Between the first groove 8 and the second grooves 9, they are completely communicated along the axial direction of the flange 2. Along the circumferential direction of the flange 2, one second groove 9 is located on one side of the first groove 8, and the other second groove 9 is located on the other side of the first groove 8. The back pressure hole 7 is located between the two fixing holes 10. The second groove 9 can be provided with a pin hole, and the fixing member 11 is a pin. The valve cover is fixed in the second groove 9 through the fixing member 11.

[0034] In some embodiments, along the axial direction of the flange 2, there is a first distance between the bottom of the second groove 9 and the bottom of the first groove 8, and the height of the valve body 4 is less than the first distance.

[0035] In this technical solution, since the height of the valve body 4 is less than the first distance, the valve body 4 can move stably in the first groove 8 to open or close the through hole 6.

[0036] In some embodiments, the diameter of the valve body 4 is less than the diameter of the first groove 8, and a protrusion 17 is provided on the side of the valve cover 5 facing the valve body 4. The protrusion 17 is located between the valve body 4 and the side wall of the first groove 8. The cooperation between the protrusion 17 and the valve body 4 forms the limiting structure.

[0037] In this technical solution, with reference to Figure 9-13 As shown, the axial movement of the valve body 4 is limited by the protrusion 17, thereby ensuring the stable movement of the valve body 4.

[0038] In some embodiments, the protrusion 17 is annular, at least part of the valve body 4 is located within the protrusion 17. Along the axial direction of the flange 2, there is a second distance between the side of the valve cover 5 close to the valve body 4 and the bottom of the first groove 8, and the second distance is greater than the height of the valve body 4.

[0039] In this technical solution, the height of the protrusion 17 is less than the depth of the first groove 8, and the length of the valve cover 5 is greater than the diameter of the first groove 8. Taking the radial cross-section of the flange 2 as the projection plane, the projected area of the valve cover 5 is less than the projected area of the first groove 8. At this time, an annular exhaust channel is formed between the side wall of the first groove 8 and the protrusion 17.

[0040] In some embodiments, the valve cover 5 and the valve body 4 are connected by an elastic member. Along the axial direction of the flange 2, there is an opening on the elastic member. One end of the opening is communicated with the back pressure hole, and the other end of the opening is connected to the valve body 4.

[0041] In this technical solution, the elastic member can be a spring. Under the action of the elastic member, when the valve body 4 moves upward, the spring is compressed, and when it moves downward, the spring is stretched, thereby ensuring the movement of the valve body 4.

[0042] In some embodiments, a positioning pin 16 is provided on the valve body 4, and a positioning hole 14 is provided on the valve cover 5. Along the axial direction of the flange 2, the positioning pin 16 can move within the positioning hole 14 to form the limiting structure.

[0043] In this technical solution, preferably, two positioning holes 14 and two positioning pins 16 are used. With the cooperation of the positioning holes and the positioning pins 16, the valve body 4 moves stably along the axial direction within the first groove 8. The valve body 4 can move axially freely within the first groove 8 by the exhaust valve cover 5 and the positioning pins 16.

[0044] In some embodiments, a fifth groove 15 is provided at one end of the valve body 4 facing the valve cover 5, and the fifth groove 15 is arranged opposite to the back pressure hole 7.

[0045] In this technical solution, through the fifth groove 15, the weight of the valve body 4 can be reduced, and the reliability of the valve body 4 can be improved: the cavity on the back pressure side of the exhaust valve with increased enthalpy, firstly, does not affect the sealing area on the exhaust port side; secondly, it reduces the weight of the exhaust valve, reduces the impact force on the valve seat surface and the valve cover and the exhaust resistance caused by the axial up and down movement of the exhaust valve, and improves the reliability and comprehensive energy efficiency of the whole machine. A back pressure hole 7 is provided on the side of the exhaust valve cover 5 away from the exhaust valve body 4. The exhaust valve body 4 moves axially under the action of the pressure difference between the back pressure hole side and the refrigerant gas pressure in the cylinder compression cavity to achieve closing or opening of the exhaust.

[0046] In some embodiments, the depth of the first groove 8 is H, the height of the valve body 4 is h, the height of the positioning pin 16 is h0, and the depth of the positioning hole 14 is h2, and they satisfy H - h2 - h < h0 < h2.

[0047] In this technical solution, with reference to Figure 19 As shown, by restricting H - h2 - h < h0 < h2, it can further ensure the axial positioning movement of the exhaust valve during the opening or closing process of the exhaust valve, and avoid leakage caused by possible radial displacement.

[0048] In some embodiments, the diameter of the through hole 6 is D, and the minimum cross-sectional area of the exhaust passage is S, and they satisfy S ≥ 0.25πD*D.

[0049] In this technical solution, as shown in Figure 4, the diameter of the through hole 6 is D, and the minimum cross-sectional area of the exhaust passage is S, which satisfies S≥0.25πD*D. The groove depth of the third groove 12 or the fourth groove 13 is L, and the width of the side wall where the third groove 12 or the fourth groove 13 communicates with the first groove is W, which satisfies that the minimum cross-sectional area S of the exhaust passage = 2W*L. Then preferably W*L≥0.125πD*D.

[0050] As shown in Figure 12 Figure, the minimum cross-sectional area S of the exhaust passage = πd*L, and the diameter of the flange exhaust port is defined as D. Then preferably d*L≥0.25D*D to avoid large exhaust resistance caused by insufficient exhaust passage area, which affects the performance of the compressor. In addition, the exhaust valve cover structure of this embodiment is different from that of Embodiment 1. When the exhaust valve is closed at the end of exhaust, the height of the exhaust valve protruding from the valve groove is h1. Preferably h1<0.5h to avoid tilting of the exhaust valve, reduce the local contact stress between the exhaust valve and the exhaust valve groove, and further improve the reliability of the compressor.

[0051] In the compressor exhaust structure of the present invention, the exhaust valve is of a cylindrical or non-cylindrical structure.

[0052] The present invention also provides a compressor, including the above-mentioned compressor exhaust structure.

[0053] It is easy for those skilled in the art to understand that, on the premise of no conflict, the advantageous technical features of the above-mentioned various methods can be freely combined and superimposed.

[0054] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A compressor exhaust structure, characterized in that: Comprising: A flange (2) is provided with a first groove (8) on which a through hole (6) is provided at the bottom of the first groove (8). The through hole (6) is communicated with the exhaust hole (3) of the compressor. A valve body (4) is arranged in the first groove (8). An exhaust passage is provided on the first groove (8). The valve body (4) is used to open or close the through hole (6) so that the exhaust passage is communicated with or disconnected from the through hole (6). A valve cover (5) is further provided on the flange (2). The valve cover (5) is arranged opposite to the valve body (4). A back pressure hole (7) is provided on the valve cover (5). A limiting structure is arranged in the first groove (8). Along the axial direction of the flange (2), the limiting structure is used to limit the valve body (4). A plurality of second grooves (9) are provided on the flange (2). The depth of the second groove (9) is less than the depth of the first groove (8). Along the circumferential direction of the first groove (8), at least part of the side wall of the second groove (9) is communicated with the first groove (8). A fixing hole (10) and a fixing member (11) are provided on the valve cover (5). The fixing member (11) passes through the fixing hole (10) and is fixed at the bottom of the second groove (9).

2. The compressor exhaust structure according to claim 1, characterized in that: The exhaust passage includes a third groove (12) provided on the flange (2). The bottom of the third groove (12) is in the same plane as the bottom of the first groove (8). Along the circumferential direction of the third groove (12), at least part of the side wall of the third groove (12) is communicated with the first groove (8). And / or, the exhaust passage includes a fourth groove (13) provided on the flange (2). The bottom of the fourth groove (13) is in the same plane as the bottom of the first groove (8). Along the circumferential direction of the fourth groove (13), at least part of the side wall of the fourth groove (13) is communicated with the first groove (8).

3. The compressor exhaust structure according to claim 1, characterized in that: The first groove (8) matches the valve body (4). The first groove (8) and the valve body (4) cooperate to form the limiting structure so that the valve body (4) moves along the axial direction of the flange (2).

4. The compressor exhaust structure according to claim 1, characterized in that: Along the axial direction of the flange (2), there is a first distance between the bottom of the second groove (9) and the bottom of the first groove (8). The height of the valve body (4) is less than the first distance.

5. The compressor exhaust structure according to claim 1, wherein: The diameter of the valve body (4) is less than the diameter of the first groove (8). And a protrusion (17) is provided on the side of the valve cover (5) facing the valve body (4). The protrusion (17) is located between the valve body (4) and the side wall of the first groove (8). The cooperation between the protrusion (17) and the valve body (4) forms the limiting structure.

6. The compressor exhaust structure according to claim 5, characterized in that: The protrusion (17) is annular, and at least part of the valve body (4) is located within the protrusion (17). Along the axial direction of the flange (2), there is a second distance between the side of the valve cover (5) close to the valve body (4) and the bottom of the first groove (8), and the second distance is greater than the height of the valve body (4).

7. The compressor exhaust structure according to claim 1, characterized in that: The valve cover (5) and the valve body (4) are connected by an elastic member. Along the axial direction of the flange (2), there is an opening in the elastic member. One end of the opening communicates with the back pressure hole, and the other end of the opening is connected to the valve body (4).

8. The compressor exhaust structure according to claim 1, characterized in that: A positioning pin (16) is provided on the valve body (4), and a positioning hole (14) is provided on the valve cover (5). Along the axial direction of the flange (2), the positioning pin (16) can move within the positioning hole (14) to form the limiting structure.

9. The compressor exhaust structure according to claim 8, wherein: One end of the valve body (4) facing the valve cover (5) is provided with a fifth groove (15), and the fifth groove (15) is arranged opposite to the back pressure hole (7).

10. The compressor exhaust structure according to claim 9, characterized in that: The depth of the first groove (8) is H, the height of the valve body (4) is h, the height of the positioning pin (16) is h0, and the depth of the positioning hole (14) is h2, which satisfy H - h2 - h < h0 < h2.

11. The compressor exhaust structure according to claim 1, wherein: The diameter of the through hole (6) is D, and the minimum cross-sectional area of the exhaust passage is S, which satisfy S ≥ 0.25πD*D.

12. A compressor, characterized in that, Including the compressor exhaust structure according to any one of claims 1 to 11.

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