Valve device

Abstract

The utility model discloses a valve device which comprises a valve body, an air box seat and a sealing piece, the air box seat is provided with an end face, the valve body is provided with a first wall face and a second wall face, and the first wall face is located on the radial outer side of the second wall face. In the axial direction of the valve body, the end face and the first wall face are arranged at intervals, the end face and the second wall face are arranged at intervals, and the first wall face is close to the end face relative to the second wall face. A part of the sealing piece abuts against the second wall face and the end face, at least a part of the sealing piece abuts against the first wall face and the end face, and the outer edge of the sealing piece is exposed out of the end face, so that corrosion among the first wall face, the second wall face and the end face can be reduced or even prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal management, in particular to a valve device. Background Art

[0002] Generally, the valve device includes an air tank head and a valve body, and the air tank head and the valve body are fixed, but corrosion may occur at the contact portion between the air tank head and the valve body. Utility Model Content

[0003] The utility model aims to provide a valve device which can reduce corrosion.

[0004] An embodiment of the utility model provides a valve device, including a valve body, an air box seat and a sealing member, wherein the air box seat has an end face, and the valve body has a first wall face and a second wall face, wherein the first wall face is located radially outside the second wall face; along the axial direction of the valve body, the end face and the first wall face, as well as the end face and the second wall face are spaced apart, and the first wall face is closer to the end face relative to the second wall face; part of the sealing member abuts against the second wall face and the end face, and at least part of the sealing member abuts against the first wall face and the end face, and the outer edge of the sealing member is exposed to the outside of the end face.

[0005] According to the valve device provided by the embodiment of the utility model, since at least part of the sealing member abuts against the first wall and the end face, the sealing member can separate the end face from the first wall, and by exposing the outer edge of the sealing member to the outside of the end face, the outer edge of the sealing member can also prevent external moisture from entering between the end face and the first wall, and since the first wall is located outside the second wall, external moisture cannot enter between the second wall and the end face, thereby preventing the first wall, the second wall and the end face from being corroded. In addition, the first wall is closer to the end face relative to the second wall, so when the air box seat is installed, the air box seat will squeeze the sealing member, and the first wall limits the axial position of the air box seat through the sealing member, that is, the first wall can play a role in limiting the axial installation stroke of the air box seat, thereby ensuring that the air box seat can be installed to the specified position, and the second wall is farther away from the end face relative to the first wall, so a chamber can be formed between the second wall and the end face, and part of the sealing member can be located in the chamber, and part of the sealing member abuts against the second wall and the end face, thereby having good sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a structural schematic diagram of a valve device provided by an embodiment of the utility model;

[0007] Figure 2 It is a cross-sectional structural schematic diagram of a valve device provided by an embodiment of the utility model;

[0008] Figure 3 yes Figure 2A schematic diagram of the enlarged structure at A in the middle;

[0009] Figure 4 This is a schematic diagram of the bottom structure of an air box seat provided by an embodiment of the utility model;

[0010] Figure 5 It is a side structural schematic diagram of an air box seat provided by an embodiment of the utility model;

[0011] Figure 6 This is a structural schematic diagram of a valve body provided by an embodiment of the utility model;

[0012] Figure 7 This is a schematic diagram of the cross-sectional structure of a valve body provided by an embodiment of the utility model;

[0013] Figure 8 yes Figure 7 A schematic diagram of the enlarged structure at B in the middle;

[0014] Fig. 9 This is a schematic diagram of the structure of a seal provided by an embodiment of the utility model;

[0015] Fig.10 It is a schematic diagram of the cross-sectional structure of a sealing member provided by an embodiment of the utility model;

[0016] Fig.11 It is a schematic cross-sectional structure diagram of a sealing member provided by another embodiment of the utility model.

[0017] 1. Valve body; 11. Mounting hole; 12. Sealing mounting groove; 13. Accommodating groove; 14. First channel; 15. Second channel; 16. Third channel; 17. Fourth channel; 18. Valve chamber; 19. Valve port channel; 191. First wall surface; 192. Second wall surface; 193. First step surface; 194. Third wall surface; 195. Groove; 196. Second step surface; 2. Air box head; 21. Air box seat; 211. End surface; 212. Mounting part; 213. Peripheral part; 22. Air box cover; 23. Diaphragm; 24. Transmission part; 25. Closing chamber; 26. Pressure equalizing chamber; 3. Sealing part; 31. First sealing part; 32. Second sealing part; 33. Third sealing part; 4. Valve stem; 5. Valve core assembly; 51. Valve core; 52. Valve core frame; 6. Adjustment assembly; 61. Adjustment spring; 62. Adjustment seat. DETAILED DESCRIPTION

[0018] The features and exemplary embodiments of various aspects of the present invention are described below. In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments. In this article, relational terms such as "first" and "second" are only used to distinguish one component with the same name from another, and do not necessarily require or imply any such actual relationship or order between these components.

[0019] See also Figure 1 to Figure 2 The valve device provided by the utility model includes a valve body 1, an air box head 2, a valve stem 4, a valve core component 5, and an adjusting component 6.

[0020] A first channel 14, a second channel 15, a valve chamber 18, and a valve port channel 19 are provided on one side of the valve body 1. The first channel 14 is in communication with the valve chamber 18. One end of the valve port channel 19 is in communication with the second channel 15, and the other end is in communication with the valve chamber 18, so that the second channel 15 can be in communication with the valve chamber 18 through the valve port channel 19. The opening where the valve port channel 19 communicates with the valve chamber 18 is the valve port.

[0021] At least part of the valve core assembly 5 is disposed in the valve chamber 18. The valve core assembly 5 includes a valve core 51 and a valve core frame 52. The valve core 51 is disposed in cooperation with the valve port, and the valve core frame 52 is in contact with the valve core 41.

[0022] The adjusting assembly 6 includes an adjusting seat 62 and an adjusting spring 61 . The valve body 1 has a valve chamber wall forming a valve chamber 18 . The adjusting seat 62 is threadedly connected to the valve chamber wall. One end of the adjusting spring 61 abuts against the adjusting seat 62 , and the other end abuts against the valve core frame 52 .

[0023] A third channel 16 and a fourth channel 17 are provided on the other side of the valve body 1 , and the third channel 16 and the fourth channel 17 are communicated with each other.

[0024] The gas box head 2 is fixed to the side of the valve body 1 where the third channel 16 and the fourth channel 17 are provided. Specifically, the gas box head 2 includes a gas box cover 22, a gas box seat 21, a diaphragm 23, and a transmission member 24. The gas box seat 21 is fixed to the valve body 1, and the gas box cover 22 and the gas box seat 21 are fixed, and the fixing method can be welding. The diaphragm 23 is located between the gas box cover 22 and the gas box seat 21. The diaphragm 23 divides the space between the gas box cover 22 and the gas box seat 21 into a closed chamber 25 and a pressure equalizing chamber 26. The closed chamber 25 is located on the upper side of the diaphragm 23, and the pressure equalizing chamber 26 is located on the lower side of the diaphragm 23. The closed chamber 25 is filled with refrigerant gas. The pressure equalizing chamber 26 is connected to the third channel 16 and the fourth channel 17. The transmission member 24 is located below the diaphragm 23, and the diaphragm 23 can apply force to the transmission member 24. One end of the valve stem 4 abuts against the transmission member 24, and the other end abuts against the valve core 51. The gas tank head 2 and the regulating spring 61 act together on the valve core assembly 5 to realize the opening and closing of the refrigerant passage.

[0025] The first channel 14 can be connected to the outlet of the condenser, the second channel 15 can be connected to the inlet of the evaporator, the third channel 16 can be connected to the outlet of the evaporator, and the fourth channel 17 can be connected to the inlet of the compressor. Therefore, the specific working principle of the thermal expansion valve is: the refrigerant flows out from the outlet of the condenser, flows into the evaporator through the first channel 14, the valve chamber 18, the valve port channel, and the second channel 15, and exchanges heat in the evaporator. After the heat exchange, part of the refrigerant directly enters the compressor through the third channel 16 and the fourth channel 17, and another part of the refrigerant after the heat exchange enters the equalizing chamber through the third channel 16. The refrigerant gas in the closed chamber drives the diaphragm 23 to move through the refrigerant, and the diaphragm 23 drives the valve core 51 to move axially through the transmission member 24 and the valve stem 4 to realize the opening and closing of the refrigerant passage and control the size of the refrigerant flow.

[0026] See also Figures 3 to 11 The valve device provided by the utility model further includes a sealing member 3, which is arranged between the valve body 1 and the air box head 2. In addition, the axial direction of the valve body 1 refers to the length direction of the valve body 1, and the radial direction of the valve body 1 refers to the direction perpendicular to the axial direction.

[0027] The air box seat 21 has an end face 211 and a mounting portion 212, the end face 211 can be connected to the mounting portion 212, and the end face 211 is located radially outside the mounting portion 212. The mounting portion 212 can extend along the axial direction of the sealing member 3. At least part of the outer surface of the mounting portion 212 can be provided with an external thread. Correspondingly, the axial end face of the valve body 1 is provided with a mounting hole 11, and the mounting hole 11 can be communicated with the third channel 16 and the fourth channel 17. At least part of the inner wall forming the mounting hole 11 is provided with an internal thread, and part of the mounting portion 212 can extend into the mounting hole 11, and the mounting portion 212 is threadedly connected with the inner wall forming the mounting hole 11, so that the air box head 2 and the valve body 1 are fixed.

[0028] The valve body 1 also has a first wall surface 191, a second wall surface 192, a first step surface 193, a third wall surface 194, a groove 195, and a second step surface 196. The first wall surface 191 is located radially outside the second wall surface 192, the first step surface 193 is located between the first wall surface 191 and the second wall surface 192, and the first step surface 193 can be arranged along the axial direction of the valve body 1.

[0029] It should be noted that in the existing valve device, the gas tank head 2 and the valve body 1 are both made of metal. Due to the existing processing technology, the end face 211 of the gas tank head 2 and the valve body 1 cannot be completely tightly fitted. In other words, there is a gap between the end face 211 of the gas tank head 2 and the valve body 1, and air and water will enter the gap, thereby causing corrosion. In addition, the materials of the gas tank head 2 and the valve body 1 are also different. Specifically, the gas tank head 2 is made of SUS304 (stainless steel) and the valve body 1 is made of 6061-T6 (alloy). When two different metals are in contact and there is air and water in the contact area, the contact area will be more prone to corrosion.

[0030] In the present application, the first wall surface 191 is located radially outside the second wall surface 192, and along the axial direction of the valve body 1, the end surface 211 is spaced from the first wall surface 191 and the second wall surface 192, and the first wall surface 191 is closer to the end surface 211 relative to the second wall surface 192, that is, the distance between the first wall surface 191 and the end surface 211 is smaller than the distance between the second wall surface 192 and the end surface 211. Part of the sealing member 3 abuts against the second wall surface 192 and the end surface 211, and at least part of the sealing member 3 abuts against the first wall surface 191 and the end surface 211, and the outer edge of the sealing member 3 is exposed outside the end surface 211. It can be seen that since at least part of the seal 3 abuts the first wall 191 and the end face 211, the seal 3 can separate the end face 211 from the first wall 191. Since the outer edge of the seal 3 is exposed to the outside of the end face 211, the outer edge of the seal 3 can also prevent external moisture from entering between the end face 211 and the first wall 191. Since the first wall 191 is located on the outside of the second wall 192, external moisture cannot enter between the second wall 192 and the end face 211, thereby preventing corrosion of the first wall 191, the second wall 192 and the end face 211.

[0031] In addition, the first wall 191 is closer to the end face 211 relative to the second wall 192. Therefore, when the air box seat 21 is installed, the first wall 191 can limit the axial installation stroke of the air box seat 21, thereby ensuring that the air box seat 21 can be installed to the specified position. The second wall 192 is farther away from the end face 211 relative to the first wall 191, so a chamber can be formed between the second wall 192 and the end face 211, and part of the sealing member 3 can be located in the chamber, and part of the sealing member 3 abuts the second wall 192 and the end face 211, thereby having good sealing performance.

[0032] The seal 3 includes a first sealing portion 31 and a second sealing portion 32 . The first sealing portion 31 and the second sealing portion 32 may both be annular, and the second sealing portion 32 is fixed to the first sealing portion 31 . The second sealing portion 32 is located radially outside the first sealing portion 31 .

[0033] The second sealing portion 32 abuts against the end surface 211 and the first wall surface 191. The valve body 1 also has a third wall surface 194, which is located radially outside the first wall surface 191. Along the axial direction of the valve body 1, the third wall surface 194 is close to the end surface 211 relative to the first wall surface 191, and at least part of the second sealing portion 32 is located on the side of the third wall surface 194 away from the end surface 211.

[0034] It should be clear that the third wall surface 194 is the axial end surface of the valve body 1. In the conventional valve device, during the installation of the air box seat 21, the end surface 211 abuts against the third wall surface 194, and the air box seat 21 is installed in place. In the present application, since the second sealing portion 32 is added, and the second sealing portion 32 has a certain thickness, the second sealing portion 32 will cause the installation position of the air box seat 21 to change. In order to solve this problem, in the present application, along the axial direction of the valve body 1, the first wall surface 191 is away from the end surface 211 relative to the third wall surface 194. In other words, there is a height difference between the first wall surface 191 and the third wall surface 194, and at least part of the second sealing portion 32 is located on the side of the third wall surface 194 away from the end surface 211. The height difference between the first wall surface 191 and the third wall surface 194 can offset part of the thickness of the second sealing portion 32, so that the thickness of the second sealing portion 32 itself will not affect the installation position of the air box seat 21.

[0035] In addition, since the second sealing portion 32 has good flexibility, after the end face 211 and the first wall surface 191 squeeze the second sealing portion 32, the second sealing portion 32 can fit tightly with the end face 211 and the first wall surface 191, that is, there is basically no gap between the second sealing portion 32 and the end face 211, and between the second sealing portion 32 and the first wall surface 191, so there is basically no air and water.

[0036] The end surface 211, the mounting portion 212, the second wall surface 192, and the first step surface 193 are surrounded by a sealing mounting groove 12, which is substantially annular and located radially outside the mounting hole 11. A portion of the sealing member 3 can be installed in the sealing mounting groove 12, and specifically, the first sealing portion 31 can be installed in the sealing mounting groove 12.

[0037] When the first sealing portion 31 is disposed in the sealing installation groove 12, the first sealing portion 31 can at least abut against the second wall surface 192, the first step surface 193, and the end surface 211, that is, the second wall surface 192, the first step surface 193, and the end surface 211 can all play a role in limiting the first sealing portion 31, thereby improving the installation stability of the first sealing portion 31. In addition, the first sealing portion 31 and the second sealing portion 32 are an integrated structure, so on the basis of the good stability of the first sealing portion 31, the stability of the second sealing portion 32 is also good.

[0038] In order to prevent the refrigerant in the valve body 1 from overflowing, the first sealing portion 31 is arranged in the sealing installation groove 12, and the first sealing portion 31 can abut against the end surface 211, the first step surface 193, and the second wall surface 192. Of course, the first sealing portion 31 can also abut against the installation portion 212. Along the axial direction of the valve body 1, the compression amount of the first sealing portion 31 is greater than the compression amount of the second sealing portion 32, so the first sealing portion 31 can be more tightly squeezed between the second wall surface 192 and the end surface 211, so as to have better sealing performance, so that the refrigerant inside the valve body 1 cannot overflow from between the end surface 211 and the second wall surface 192.

[0039] In order to further enhance the sealing performance between the end face 211 and the second wall face 192, the size of the first sealing portion 31 may be slightly larger than the size of the sealing installation groove 12. At this time, after the air box head 2 is fixed to the valve body 1, the first sealing portion 31 will be squeezed. It can be known that the first sealing portion 31 can be made of materials such as rubber, and the rubber will abut against the end face 211 and the second wall face 192 more closely after being squeezed, thereby enhancing the sealing performance. In addition, the first sealing portion 31 can also be deformed, and even fill the sealing installation groove 12. At this time, the first sealing portion 31 can also abut against the installation portion 212, thereby achieving a better sealing effect.

[0040] The second wall surface 192 is further provided with a groove 195, and the groove 195 extends in a direction away from the end surface 211. Part of the first sealing portion 31 is located in the groove 195, and along the radial direction of the valve body 1, the first sealing portion 31 abuts against the inner wall defining the groove 195, so the inner wall can play a role in limiting the radial movement of the first sealing portion 31, thereby improving the installation stability of the first sealing portion 31.

[0041] A second step surface 196 is provided between the third wall surface 194 and the first wall surface 191, and the second step surface 196 extends along the axial direction of the valve body 1. At least a portion of the accommodating groove 13 is provided between the second step surface 196, the first wall surface 191 and the end surface 211, at least a portion of the second sealing portion 32 is located in the accommodating groove 13, and the second step surface 196 abuts against the second sealing portion 32. At this time, the second step surface 196 can limit the radial movement of the second sealing portion 32, thereby improving the installation stability of the second sealing portion 32.

[0042] It can be imagined that the side surfaces of the first sealing portion 31 and the second sealing portion 32 facing the end surface 211 are matched with the end surface 211, and the side surfaces of the first sealing portion 31 and the second sealing portion 32 facing the end surface 211 are in contact with the end surface 211. Specifically, the end surface 211 is planar, and the side surfaces of the first sealing portion 31 and the second sealing portion 32 facing the end surface 211 are also planar, so the side surfaces of the first sealing portion 31 and the second sealing portion 32 facing the end surface 211 can both be in close contact with the end surface 211, thereby improving the sealing performance between the first sealing portion 31 and the second sealing portion 32 and the end surface 211.

[0043] See also Figures 9 and 10 In order to further reduce or even prevent air and moisture from entering between the end face 211 and the first wall 191, the seal 3 further includes a third seal portion 33. Specifically, the third seal portion 33 and the second seal portion 32 are an integral structure, and the third seal portion 33 is located radially outside the second seal portion 32. In addition, the third seal portion 33 can extend along the edge of the second seal portion 32. It is very important that the third seal portion 33 is located radially outside the end face 211, that is, when the air box head 2 is fixed to the valve body 1, the third seal portion 33 can be exposed to the outside of the end face 211. One side of the third seal portion 33 can abut against the outer surface of the air box seat 21, and the other side of the third seal portion 33 abuts against the valve body 1, thereby reducing or even preventing moisture in the air from entering between the end face 211 and the first wall 191, thereby reducing or even preventing corrosion of the end face 211, the first wall 191, and the second wall 192.

[0044] More specifically, the air box seat 21 includes an outer peripheral portion 213, which is located radially outside the end face 211, and along the axial direction of the valve body 1, the outer peripheral portion 213 is away from the valve body 1 relative to the end face 211. The outer surface of the outer peripheral portion 213 may be arc-shaped, so in order to abut more closely with the outer peripheral portion 213, the height of the third sealing portion 33 along the axial direction of the sealing member 3 is greater than the height of the second sealing portion 32, and the height of the third sealing portion 33 may gradually increase along the radial direction away from the second sealing portion 32. The side of the third sealing portion 33 facing the outer peripheral portion 213 is adapted to and abuts against the outer peripheral portion 213, and the side of the third sealing portion 33 facing the valve body 1 is adapted to and abuts against the valve body 1. At this time, when the third sealing portion 33 is installed, the third sealing portion 33 will fit with the outer peripheral portion 213 under the pressure of the air box seat 21, thereby further improving the tightness of the abutment between the third sealing portion 33 and the outer peripheral portion 213, and between the third sealing portion 33 and the valve body 1.

[0045] In addition, the shape of the surface where the third sealing portion 33 contacts the air tank seat 21 is not limited, and it can be an inclined surface or a curved surface according to actual needs.

[0046] See also Fig.11In another embodiment, the seal 3 may include only a first sealing portion 31 and a second sealing portion 32. The extension direction of the second sealing portion 32 is parallel to the radial direction of the seal 3, and the edge of the second sealing portion 32 extends to the radial outside of the end face 211, so as to prevent external air and moisture from entering between the end face 211 and the valve body 1. The rest of the technical solutions of this embodiment may be the same as the above-mentioned embodiment.

[0047] It should be noted that the above implementation modes are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention, such as the directional definitions of "front", "rear", "left", "right", "up" and "down". Although the present invention has been described in this specification with reference to the above implementation modes, those skilled in the art should understand that those skilled in the art can still modify, combine or make equivalent substitutions to the present invention, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A valve device, characterized in that: The valve body (1) comprises a valve body (1), an air box seat (21) and a sealing member (3), wherein the air box seat (21) has an end surface (211), and the valve body (1) has a first wall surface (191) and a second wall surface (192), wherein the first wall surface (191) is located radially outward of the second wall surface (192); along the axial direction of the valve body (1), the end surface (211) and the first wall surface (191), as well as the end surface (211) and the second wall surface (192) are spaced apart, and the first wall surface (191) is closer to the end surface (211) than to the second wall surface (192); Part of the sealing member (3) abuts against the second wall surface (192) and the end surface (211), and part of the sealing member (3) abuts against the first wall surface (191) and the end surface (211), and the outer edge of the sealing member (3) is exposed outside the end surface (211).

2. The valve device according to claim 1, characterized in that The sealing member (3) comprises a second sealing portion (32), wherein the second sealing portion (32) abuts against the end surface (211) and the first wall surface (191); The valve body (1) has a third wall surface (194), and the third wall surface (194) is located radially outside the first wall surface (191). Along the axial direction of the valve body (1), the third wall surface (194) is close to the end surface (211) relative to the first wall surface (191). Along the axial direction of the valve device, at least a part of the second sealing portion (32) is located on the side of the third wall surface (194) away from the end surface (211).

3. The valve device according to claim 2, characterized in that The sealing member (3) comprises a first sealing portion (31), the first sealing portion (31) and the second sealing portion (32) are an integral structure, the first sealing portion (31) is located radially inside the second sealing portion (32), and the first sealing portion (31) abuts against the end surface (211) and the second wall surface (192); Along the axial direction of the valve body (1), the compression amount of the first sealing portion (31) is greater than the compression amount of the second sealing portion (32).

4. The valve device according to claim 3, characterized in that A first step surface (193) is provided between the first wall surface (191) and the second wall surface (192), and the first step surface (193) is arranged along the axial direction of the valve body (1); at least a portion of a sealing installation groove (12) is provided between the second wall surface (192), the first step surface (193), and the end surface (211), and the first sealing portion (31) is located in the sealing installation groove (12), and the first sealing portion (31) is in contact with the second wall surface (192), the first step surface (193), and the end surface (211).

5. The valve device according to claim 3, characterized in that The second wall surface (192) is provided with a groove (195), and part of the first sealing portion (31) is located in the groove (195); Along the radial direction of the valve body (1), the first sealing portion (31) abuts against the inner wall defining the groove (195).

6. The valve device according to any one of claims 2 to 5, characterized in that: The sealing member (3) further comprises a third sealing portion (33), wherein the third sealing portion (33) and the second sealing portion (32) are integrally formed, and the third sealing portion (33) is located radially outside the second sealing portion (32), and the third sealing portion (33) is exposed outside the end surface (211); one side surface of the third sealing portion (33) abuts against the outer surface of the air box seat (21), and the other side surface of the third sealing portion (33) abuts against the valve body (1).

7. The valve device according to claim 6, characterized in that The air box seat (21) further comprises an outer peripheral portion (213), wherein the outer peripheral portion (213) is located radially outside the end surface (211), and along the axial direction of the valve body (1), the outer peripheral portion (213) is away from the valve body (1) relative to the end surface (211); Along the axial direction of the valve body (1), the height of the third sealing portion (33) is greater than the height of the second sealing portion (32), the side of the third sealing portion (33) facing the outer peripheral portion (213) is adapted to and abuts against the outer peripheral portion (213), and the side of the third sealing portion (33) facing the valve body (1) is adapted to and abuts against the valve body (1).

8. The valve device according to claim 2, characterized in that The air box seat (21) also includes a mounting portion (212), and the mounting portion (212) is located radially inward of the end surface (211); the mounting portion (212) extends along the axial direction of the valve body (1), and the valve body (1) is formed with a mounting hole (11), at least a portion of the mounting portion (212) is located in the mounting hole (11), and the mounting portion (212) is fixed to the inner wall defining the mounting hole (11).

9. The valve device according to claim 4, characterized in that A second step surface (196) is provided between the third wall surface (194) and the first wall surface (191), and the second step surface (196) is arranged along the axial direction of the valve body (1); at least a portion of the accommodating groove (13) is provided between the second step surface (196), the first wall surface (191) and the end surface (211), at least a portion of the second sealing portion (32) is located in the accommodating groove (13), and the second step surface (196) is in contact with the second sealing portion (32).

10. The valve device according to any one of claims 1 to 9, characterized in that: The invention also comprises an air box head (2), the air box head (2) further comprising an air box cover (22), a diaphragm (23), and a transmission member (24); the air box cover (22) is fixed to the air box seat (21); the diaphragm (23) is located between the air box cover (22) and the air box seat (21); a closed chamber (25) is formed between the diaphragm (23) and the air box cover (22); a pressure equalizing chamber (26) is formed between the diaphragm (23) and the air box seat (21); the transmission member (24) is located at the lower side of the diaphragm (23) and abuts against the diaphragm (23); the valve device further comprises a valve stem (4), a valve core assembly The valve core assembly (5) comprises a valve core (51) and a valve core frame (52), wherein the valve core (51) is arranged in cooperation with the valve port of the valve body (1), and the valve core frame (52) abuts against the valve core (51); the regulating assembly (6) comprises an regulating spring (61) and an regulating seat (62), wherein the regulating seat (62) is fixed to the inner wall of the valve body (1), one end of the regulating spring (61) abuts against the valve core frame (52), and the other end abuts against the regulating seat (62); one end of the valve stem (4) abuts against the transmission member (24), and the other end abuts against the valve core (51).

Images