Valve device

Abstract

A valve device comprises a valve seat, a valve body and a sealing piece, at least part of the valve seat is located in the valve body, the valve device is provided with a gap, and the wall forming the gap comprises a first wall face and a second wall face. At least part of the sealing gasket is located in the gap, one side of the sealing gasket abuts against the first wall face, the other side of the sealing gasket abuts against the second wall face, the valve device comprises a limiting piece, and at least part of the limiting piece is located between the sealing gasket and the first wall face in the axial direction of the valve device, so that the consistency of the sealing effect of the valve device can be improved.

Description

Technical Field

[0001] The present application relates to the field of fluid control technology, and in particular to a valve device. Background Art

[0002] The valve device includes a valve component and a valve body. The valve component and the valve body are usually sealed with a seal to prevent leakage of the working medium. The sealing effect is closely related to the compression of the seal. Especially in mass production, how to ensure the consistency of the sealing effect is a technical problem that needs to be improved urgently. Summary of the invention

[0003] The purpose of the present application is to provide a valve device that can improve the consistency of the sealing effect of the valve device.

[0004] To achieve the above purpose, an implementation method of the present application adopts the following technical solution:

[0005] A valve device comprises a valve seat, a valve body and a sealing member, wherein at least part of the valve seat is located in the valve body, the valve device has a gap, and the walls forming the gap include a first wall surface and a second wall surface; at least part of the sealing member is located in the gap, one side of the sealing member abuts against the first wall surface, and the other side of the sealing member abuts against the second wall surface; the valve device comprises a limit member, and along the axial direction of the valve device, at least part of the limit member is located between the seal and the first wall surface.

[0006] In one embodiment provided by the present application, the valve device includes a valve seat, a valve body and a sealing member, one side of the sealing member abuts against a first wall surface, the other side of the sealing member abuts against a second wall surface, and at least part of the stopper is located between the sealing member and the first wall surface. This is conducive to controlling the deformation amount of the sealing member in the axial direction of the valve device, thereby improving the consistency of the sealing effect of the valve device. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 is a schematic diagram of the three-dimensional structure of an embodiment of the valve device provided by the present application;

[0008] Figure 2 yes Figure 1 A schematic diagram of the local enlarged structure at point A in the middle;

[0009] Figure 3 yes Figure 1 Schematic diagram of the structure of the middle seal;

[0010] Figure 4 yes Figure 1 A structural schematic diagram of another implementation method;

[0011] Figure 5 yes Figure 4 Schematic diagram of the structure of the middle seal before being compressed;

[0012] Figure 6 yes Figure 4 A schematic diagram of the partial structure of point B after the middle seal is compressed;

[0013] Figure 7 yes Figure 1 A schematic structural diagram of a third implementation method;

[0014] Figure 8 yes Figure 7 A schematic diagram of the partially enlarged structure at C in the middle;

[0015] Fig. 9 yes Figure 1 A schematic structural diagram of a fourth implementation mode;

[0016] Fig.10 yes Figure 1 A schematic structural diagram of a fifth implementation mode;

[0017] Fig.11 yes Figure 1 Schematic diagram of the structure of the sixth implementation method.

[0018] Description of Figure Numbers:

[0019] 100, valve device; 10, valve component; 11, valve seat; 111, main body; 1111, first wall; 112, extension; 1121, abutment wall; 12, gap; 13, valve mouth; 131, communication portion; 132, first sealing groove; 133, through hole; 14, first sealing ring; 15, valve core; 16, screw rod; 17, threaded sleeve; 18, fastener; 19, second sealing ring; 20, valve body; 21, limit groove ; 22. Installation cavity; 23. Inlet portion; 24. Outlet portion; 25. Second wall surface; 26. Step wall; 30. Sealing member; 301. First portion; 302. Second portion; 303. Third portion; 304. First supporting point; 305. Second supporting point; 31. Limiting member; 311. Bending portion; 312. Limiting portion; 32. Support arm; 33. Positioning pin; 40. Coil assembly; 41. Rotor mechanism; 42. Stator mechanism. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0021] The present application is further described below with reference to the accompanying drawings and specific embodiments:

[0022] Figures 1 to 11 An embodiment of a valve device 100 is illustrated, wherein the valve device 100 includes a valve component 10, a valve body 20 and a coil assembly 40. In this embodiment, the valve component 10 is first fixedly connected to the valve body 20, and then the coil assembly 40 is fixedly connected to the valve body 20. The valve body 20 has an installation cavity 22, and at least part of the valve component 10 is located in the installation cavity 22.

[0023] In other embodiments, the coil assembly 40 may be fixedly connected to the valve component 10, or the coil assembly 40 may be assembled with the valve component 10 and then fixedly connected to the valve body 20, which can also achieve overall installation.

[0024] In this embodiment, the valve component 10 includes a valve seat 11, and the valve device 100 also includes a sealing member 30. At least part of the valve seat 11 is located in the valve body 20. The valve device 100 has a gap 12, and the wall forming the gap 12 includes a first wall surface 1111 and a second wall surface 25. The valve device 100 includes a stopper 31, and at least part of the sealing member 30 is located in the gap 12. One side of the sealing member 30 abuts against the first wall surface 1111, and the other side of the sealing member 30 abuts against the second wall surface 25. Along the axial direction of the valve device 100, at least part of the stopper 31 is located between the sealing member 30 and the first wall surface 1111. Specifically, the valve seat 11 includes an external threaded portion, and the valve body 20 includes an internal threaded portion. The internal threaded portion is located in the installation cavity 22, and the internal threaded portion and the external threaded portion are threadedly matched, so that at least part of the valve seat 11 can be extended into or withdrawn from the installation cavity 22. In addition, this can reduce the risk of leakage of the working medium from the assembly gap 12 between the valve component 10 and the valve body 20. At the same time, since the stability of the threaded seal is relatively poor, the present embodiment can further improve the sealing effect between the valve component 10 and the valve body 20 by adopting the sealing member 30 structure.

[0025] The valve body 20 includes a step wall 26, and the valve seat 11 includes a main body 111 and an extension 112. Along the axial direction of the valve device 100, along the axial direction of the valve device 100, the step wall 26 is away from the main body 111 relative to the gap 12, and the extension 112 extends from the main body 111 toward the step wall 26. Specifically, the step wall 26 and other parts of the valve body 20 are an integral structure or a split structure. If an integral structure design is adopted, the assembly process can be simplified and the assembly time can be saved; if a split structure design is adopted, the step wall 26 can be replaced according to the specific structure of the seal 30 and the actual use situation, and the adaptability is strong.

[0026] Specifically, the first wall surface 1111 is the bottom wall surface of the main body 111, and the second wall surface 25 is the top wall surface of the step wall 26. In other words, the sealing member 30 is located between the bottom wall surface of the main body 111 and the top wall surface of the step wall 26, and the stopper 31 is located between the sealing member 30 and the bottom wall surface of the main body 111. When the valve seat 11 moves downward along the axial direction of the valve device 100, the valve seat 11 first contacts the sealing member 30 and presses the sealing member 30 until the first wall surface 1111 contacts the stopper 31.

[0027] It should be noted that if the seal 30 does not adopt the limiting structure of the limiting member 31, due to the differences between different individuals and the different state differences of the individual individuals, when at least part of the valve seat 11 extends into the installation cavity 22, it is difficult to tighten the valve seat 11 to the axial height of the gap 12 within a unified and reasonable standard range, which will cause different valve devices 100 to have different sealing differences. In this embodiment, the limiting member 31 is located between the sealing member 30 and the bottom wall surface of the main body 111. This is to control the relative height position of the valve seat 11 and the valve body 20. In actual use, it can be changed according to the structure of the valve seat 11, the structure of the valve body 20 and the structure of the sealing member 30. This is conducive to controlling the deformation amount of the sealing member 30 in the axial direction of the valve device 100 within a certain range, thereby improving the consistency of the sealing effect of the valve device 100. In some embodiments, the limiting member 31 and one of the valve seat 11, the valve body 20 or the sealing member 30 are a separate structure or an integrated structure.

[0028] The terms "first" and "second" in this specification are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0029] Combination Figures 1 to 6 As shown, in some embodiments, the stopper 31 is fixedly connected or positionally connected to the sealing member 30 or is an integral structure, and the stopper 31 is connected to the radial inner side and / or radial outer side of the sealing member 30. Specifically in this embodiment, the stopper 31 and the sealing member 30 are an integral structure, one side of the stopper 31 abuts against the first wall surface 1111, and the other side of the stopper 31 abuts against the sealing member 30.

[0030] In more detail, the first wall surface 1111 is located on the bottom wall surface of the main body 111, and the limit member 31 includes a bending portion 311 and a limiting portion 312. The bending portion 311 is bent from the seal 30 toward the first wall surface 1111, and the limiting portion 312 extends from the bending portion 311 toward the radial inner side of the seal 30, and the limiting portion 312 is connected to the radial outer side of the seal 30 through the bending portion 311, so as to keep the limit member 31 between the seal 30 and the first wall surface 1111, so that the valve seat 11 can contact the limit member 31 when the seal 30 is squeezed downward along the axial direction of the valve device 100.

[0031] In some embodiments, the number of the limit members 31 is one, and along the circumference of the valve device 100, the limit member 31 surrounds the radial outer side of the seal 30; or, in other embodiments, the number of the limit members 31 is at least two, and along the circumference of the valve device 100, multiple limit members 31 are arranged at intervals on the radial outer side of the seal 30. When the number of the limit members 31 is at least two, each of the limit members 31 is connected to the radial outer side of the seal 30, so that the limit member 31 is covered on the radial outer side of the seal 30, which can also play the effect of controlling the relative height of the valve seat 11 and the valve body 20. Furthermore, on the one hand, the bending portion 311 and the limiting portion 312 are an integral structure, and the limiting member 31 and the sealing member 30 are an integral structure, which can reduce the number of parts, and only one part is needed to achieve the sealing function and the limiting function. In addition, the installation steps can be reduced, which facilitates processing; on the other hand, the bending portion 311 is located radially outside the seal 30, so that the bending portion 311 can abut against the wall forming the installation cavity 22, and can radially limit the seal 30, thereby reducing the risk of deviation of the seal 30 in the gap 12.

[0032] It should be explained that the height H2 of the seal 30 before being compressed, the height H1 of the gap 12 and the thickness H3 of the seal 30 satisfy the relationship: H2>H1>H3. The thickness H3 of the seal 30 is 0.253±0.1mm, the height H1 of the gap 12 is 0.35±0.1mm, the height H2 of the seal 30 before being compressed is 0.953±0.1mm, and the height of the stopper 31 is 0.097±0.08mm.

[0033] In this embodiment, since the valve seat 11 can extend into the installation cavity 22 along the axial direction of the valve device 100, when the valve seat 11 continues to move downward until it abuts against the seal 30, the valve seat 11 continues to squeeze the seal 30 downward until the first wall surface 1111 of the valve seat 11 contacts the limit member 31. At this time, the sealing effect of the seal 30 is better.

[0034] Combination Figures 4 to 6 As shown, in the second embodiment, the difference from the first embodiment is that: in some embodiments, the stopper 31 is fixedly connected or limitedly connected to the valve seat 11 or is an integral structure, and the stopper 31 is connected to the radial inner side and / or radial outer side of the valve seat 11. Specifically in this embodiment, the stopper 31 is an integral structure with the valve seat 11, and the stopper 31 is located on the radial outer side of the valve seat 11.

[0035] In more detail, the first wall 1111 is located on the bottom wall of the main body 111, the second wall 25 is located on the top wall of the step wall 26, and the limit member 31 protrudes from the valve seat 11 toward the second wall 25; in some embodiments, the number of the limit member 31 is one, and along the circumference of the valve device 100, the limit member 31 surrounds the radial outer side of the first wall 1111; or, in other embodiments, the number of the limit members 31 is at least two, and along the circumference of the valve device 100, multiple limit members 31 are arranged at intervals on the radial outer side of the first wall 1111. When the number of the limit members 31 is at least two, each of the limit members 31 protrudes from the valve seat 11 toward the second wall 25, which can also play a role in controlling the relative height of the valve seat 11 and the valve body 20.

[0036] In this embodiment, the thickness H3 of the sealing member 30 is 0.253±0.1 mm, the height of the stopper 31 is 0.097±0.08 mm, the height H1 of the gap 12 is 0.35±0.1 mm, and the height H2 of the sealing member 30 before being compressed is 0.953±0.1 mm.

[0037] It should be noted that the directional words such as up, down, left, right, front and back mentioned in this specification are based on the directions in the drawings of the specification and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0038] Specifically, the sealing member 30 includes a first portion 301, a second portion 302 and a third portion 303. Along the radial direction of the valve device 100, one end of the third portion 303 is fixedly connected to the first portion 301 or is an integral structure, and the other end of the third portion 303 is fixedly connected to the second portion 302 or is an integral structure. An extension direction of the third portion 303 has an angle greater than zero with an extension direction of the first portion 301 and an extension direction of the second portion 302. The first portion 301 abuts against the first wall surface 1111, and the second portion 302 abuts against the second wall surface 25.

[0039] In the first embodiment and the second embodiment, one end of the third part 303 is an integral structure with the first part 301, and the other end of the third part 303 is an integral structure with the second part 302. In other embodiments, the above connection structure is included but not limited to. Specifically in this embodiment, the first part 301, the second part 302 and the third part 303 are all plate-like structures, wherein the first part 301 and the second part 302 are both arranged horizontally along the radial direction of the valve device 100, the first part 301 can better fit the first wall surface 1111, and the second part 302 can better fit the second wall surface 25, thereby improving the sealing performance of the sealing member 30 structure. Furthermore, under the axial force, the third part 303 of the sealing member 30 forms a lever structure relative to the first part 301 and the second part 302, so that the first part 301 has a higher fit with the first wall surface 1111, and the second part 302 has a higher fit with the second wall surface 25, and the sealing effect is better.

[0040] More specifically, the angle between the third portion 303 and the first portion 301 is an obtuse angle, and the angle between the third portion 303 and the second portion 302 is an obtuse angle. When the sealing member 30 is pressed downward by the valve seat 11 along the axial direction of the valve device 100, the first portion 301 moves toward the extension portion 112 relative to the third portion 303, and the second portion 302 moves away from the extension portion 112 relative to the third portion 303. When the sealing member 30 is compressed to the point where the end of the first portion 301 abuts against the inner wall of the extension portion 112 and the second portion 302 abuts against the inner wall of the installation cavity 22, the third portion 303 forms a lever structure relative to the first portion 301 and the second portion 302, and the inner wall of the extension portion 112 and the inner wall of the installation cavity 22 play a certain supporting role on the sealing member 30, which can enhance the pressing force of the sealing member 30, thereby improving the sealing performance of the valve device 100.

[0041] In this embodiment, the limit member 31 and the valve seat 11 are an integral structure, and the limit member 31 is located radially outside the valve seat 11. Since the valve seat 11 can move downward along the axial direction of the valve device 100, when the limit member 31 abuts against the second part 302, the valve seat 11 stops moving downward.

[0042] Please refer to Figure 7 and Figure 8In the third embodiment, the difference from the above-mentioned first embodiment is that: in this embodiment, the valve body 20 includes a step wall 26, the valve seat 11 includes a main body 111 and an extension portion 112, along the axial direction of the valve device 100, the step wall 26 is away from the main body 111 relative to the gap 12, and the extension portion 112 extends from the main body 111 toward the step wall 26; the first portion 301 is annularly arranged on the outer periphery of the extension portion 112, along the radial direction of the valve device 100, the first portion 301 and the extension portion 112 are abutted or gapped, the first portion 301 is closer to the extension portion 112 than the second portion 302, the extension portion 112 has an abutting wall 1121, and the abutting wall 1121 abuts against the step wall 26. It should be explained that the valve seat 11 can be extended into or withdrawn from the installation cavity 22. When the valve seat 11 continues to move downward until the abutting wall 1121 abuts against the step wall 26, the valve seat 11 will stop moving downward, so that the height H1 of the gap 12 along the axial direction of the valve device 100 can be kept within a reasonable range each time it is assembled. It can be understood that this is conducive to controlling the deformation amount of the seal 30 in the axial direction of the valve device 100 within a certain range, thereby improving the consistency of the sealing effect of the valve device 100. Specifically in this embodiment, the height H1 of the gap 12 is 0.35±0.1mm.

[0043] Please refer to Fig. 9 In the fourth embodiment, the difference from the first embodiment is that: in this embodiment, the valve device 100 further includes a support arm 32, the valve body 20 has a limiting groove 21, the limiting groove 21 is located on the top surface of the valve body 20, the support arm 32 extends outward from the main body 111 along the radial direction of the valve device 100, and at least part of the support arm 32 is located in the limiting groove 21, wherein the support arm 32 abuts against the bottom wall forming the limiting groove 21. Specifically, since the valve seat 11 can be screwed into the installation cavity 22 along the axial direction of the valve device 100, when the valve seat 11 continues to move downward until the support arm 32 abuts against the bottom wall forming the limiting groove 21, the valve seat 11 can no longer move along the axial direction of the valve device 100, and the height H1 of the gap 12 can be kept within a reasonable range each time it is assembled. In other words, for the assembly process between the valve seat 11 and the valve body 20, it is sufficient to tighten the valve seat 11 until the bottom wall of the support arm 32 abuts against the groove wall of the limiting groove 21. At this time, the height H1 of the gap 12 is within a reasonable range, so that the deformation amount of the seal 30 in the axial direction of the valve device 100 can be controlled within a certain range, and the difference problem between different products caused by the different deformation amounts of the seal 30 can be improved. Specifically in this embodiment, the height H1 of the gap 12 is 0.35±0.1mm.

[0044] Preferably, the valve device 100 further includes a second sealing ring 19 , which is located in the limiting groove 21 and abuts against the coil assembly 40 , thereby further improving the sealing effect of the valve device 100 .

[0045] Please refer to Fig.10 In the fifth embodiment, the difference from the first embodiment is that in this embodiment, the stopper 31 is fixedly connected or limit-connected with the valve seat 11 or is an integral structure, and at least part of the stopper 31 is located in the gap 12. When the valve seat 11 continues to move downward until the first wall surface 1111 abuts against the stopper 31, the height between the top wall of the stopper 31 and the step wall 26 is the height of the gap 12.

[0046] Optionally, the number of the limiting members 31 is at least one. When the number of the limiting members 31 is one, the limiting member 31 is located on the radially outer side or the radially inner side of the second wall 25. At this time, the limiting member 31 can be an annular structure; when the number of the limiting members 31 is at least two, the limiting members 31 are arranged at intervals on the radially outer side or the radially inner side of the second wall 25.

[0047] Specifically, the limiting member 31 is preferably but not limited to a positioning pin 33, the valve seat 11 has a limiting hole, the positioning pin 33 is at least partially located in the limiting hole, and the other part of the positioning pin 33 is located in the gap 12, so that the valve seat 11 can be prevented from continuing to move downward along the axial direction of the valve device 100, keeping the gap 12 within a certain range.

[0048] Along the axial direction of the valve body 20, the height H1 of the gap 12 and the overall height H2 of the seal 30 before the seal 30 is compressed satisfy the following formula: H2>H1. It should be noted that the height H1 of the gap 12 refers to the height of the gap 12 when the valve seat 11 moves downward along the axial direction of the valve device 100 to abut against the stopper 31. Specifically in this embodiment, the height H1 of the gap 12 is equal to the height between the top wall of the stopper 31 and the step wall 26, H1 = 0.35 ± 0.1 mm.

[0049] In other embodiments, the seal 30 further includes a first support point 304 and a second support point 305, one end of the first support point 304 is connected to the first part 301, the other end of the first support point 304 is connected to the third part 303, one end of the second support point 305 is connected to the second part 302, and the other end of the second support point 305 is connected to the third part 303; wherein the first support point 304 and the second support are both arc-shaped structures. The difference from the above embodiment is that when the first support point 304 abuts against the first wall 1111, there is an angle between the first part 301 and the first wall 1111, and when the second support point 305 abuts against the second wall 25, there is an angle between the second part 302 and the second wall 25. In this arrangement, since the first part 301, the first support point 304, the third part 303, the second support point 305 and the second part 302 are connected in sequence, a wave-shaped sealing structure is formed. It can be understood that when the valve seat 11 moves downward along the axial direction of the valve device 100 to squeeze the seal 30, the first support point 304 elastically abuts against the first wall 1111, and the second support point 305 elastically abuts against the second wall 25. The use of a double-point sealing structure can further enhance the sealing effect of the valve device 100.

[0050] It is worth mentioning that the first support point 304 and the second support point 305 can be a line seal or a surface seal. In the third to sixth embodiments, the seal 30 is sealed by abutting the first wall surface 1111 through the first support point 304, and is sealed by abutting the second wall surface 25 through the second support point 305. Although this sealing method relatively reduces the sealing area, it can also improve the sealing effect of the first support point 304 and the second support point 305 by concentrating the stress on the first support point 304 and the second support point 305.

[0051] The valve body 20 includes an inlet portion 23 and an outlet portion 24, and the valve member 10 further includes a valve mouth 13, the valve mouth 13 has a communication portion 131, and the communication portion 131 is communicated with the inlet portion 23. The valve device 100 further includes a first sealing ring 14, the valve mouth 13 has a first sealing groove 132, and at least a portion of the first sealing ring 14 is located in the first sealing groove 132 and abuts against the inner wall of the valve body 20.

[0052] The valve device 100 further includes a valve core 15 . The valve mouth 13 has a through hole 133 . The valve core 15 can block or open the through hole 133 . When the valve core 15 opens the through hole 133 , the through hole 133 can communicate with the inlet portion 23 and the outlet portion 24 .

[0053] The valve component 10 also includes a screw rod 16, which is threadedly connected to the valve core 15. The screw rod 16 can drive the valve core 15 to block or open the through hole 133. When the valve core 15 blocks the through hole 133, the connecting passage between the outlet portion 24 and the connecting portion 131 is closed; when the valve core 15 opens the through hole 133, the connecting portion 131 is connected to the inlet portion 23 and the outlet portion 24 respectively.

[0054] Furthermore, the valve component 10 further includes a threaded sleeve 17 , which includes an internal threaded portion and an external threaded portion. The internal threaded portion is threadably matched with the screw rod 16 , and the external threaded portion is threadably matched with the valve core 15 .

[0055] Please refer to Fig.11 As shown, in the sixth embodiment, the difference from the first embodiment is that: in this embodiment, the valve body 20 has a receiving wall surface, and the axial height of the valve mouth 13 along the valve device 100 is greater than that in the above embodiment. When the valve seat 11 moves downward along the axial direction of the valve device 100 until the bottom wall of the valve mouth 13 abuts against the receiving wall surface, the valve seat 11 will stop moving downward, so that the height H1 of the gap 12 can be kept within a reasonable range every time it is assembled. Specifically, the height H1 of the gap 12 is 0.35±0.1mm at this time.

[0056] Combination Figure 1 , Figure 4 , Figure 7 , Fig. 9 , Fig.10 and Fig.11 As shown, the coil assembly 40 further includes a rotor mechanism 41 and a stator mechanism 42. The stator mechanism 42 is sleeved on the outer periphery of the rotor mechanism 41. The stator mechanism 42 is drivingly connected to the rotor mechanism 41, and can drive the screw rod 16 and the valve core 15 to move along the axial direction of the valve device 100. Specifically, in this embodiment, an excitation magnetic field can be generated by passing a predetermined current into the stator mechanism 42. The rotor mechanism 41 rotates in the excitation magnetic field generated by the stator mechanism 42, and the screw rod 16 converts the rotational motion into an axial motion as the rotor mechanism 41 rotates, so that the screw rod 16 can achieve axial movement during the rotation process.

[0057] It should be noted that, in this embodiment, the axial direction of the valve device 100 is parallel to the extension direction of the rotation axis of the rotor mechanism 41 , and the radial direction of the valve device 100 is perpendicular to the extension direction of the rotation axis of the rotor mechanism 41 .

[0058] The rotor mechanism 41 includes a magnet, and the valve component 10 also includes a fastener 18. When the fastener 18 rotates, it can drive the screw 16 to rotate. Specifically, the stator mechanism 42 generates an excitation magnetic field by passing a predetermined current, and the magnet structure rotates in the excitation magnetic field generated by the stator mechanism 42. When the magnet structure rotates, it drives the screw 16 to rotate through the fastener 18. During the rotation of the screw 16, the valve core 15 is driven to move up and down along the axial direction of the valve device 100 through the threaded sleeve 17. It should be noted that when the stator mechanism 42 generates an excitation magnetic field by passing a predetermined current, the magnet structure will rotate in the excitation magnetic field generated by the stator mechanism 42. During the rotation of the screw 16, the valve core 15 is driven to move up and down along the axial direction of the valve device 100 through the threaded sleeve 17. The valve core 15 rotates and moves downward to block or open the through hole 133.

[0059] It should be noted that the above embodiments are only used to illustrate the present application and are not intended to limit the technical solutions described in the present application. Although the present application has been described in detail in this specification with reference to the above embodiments, a person of ordinary skill in the art should understand that a person of ordinary skill in the art can still modify or make equivalent substitutions to the application, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present application should be included in the scope of the claims of the present application.

Claims

1. A valve device, comprising a valve seat (11), a valve body (20) and a sealing member (30), wherein at least a portion of the valve seat (11) is located in the valve body (20), the valve device has a gap (12), and a wall forming the gap (12) comprises a first wall surface (1111) and a second wall surface (25); At least part of the sealing member (30) is located in the gap (12), one side of the sealing member (30) is in contact with the first wall surface (1111), and the other side of the sealing member (30) is in contact with the second wall surface (25), and the valve device comprises a limit member (31), and along the axial direction of the valve device, at least part of the limit member (31) is located between the sealing member (30) and the first wall surface (1111).

2. The valve device according to claim 1, It is characterized in that The limiting member (31) is fixedly connected or limit-connected to the sealing member (30) or is an integral structure; the limiting member (31) is connected to the radial inner side and / or radial outer side of the sealing member (30); one side of the limiting member (31) abuts against the first wall surface (1111), and the other side of the limiting member (31) abuts against the sealing member (30).

3. The valve device according to claim 2, It is characterized in that The first wall surface (1111) is located on the valve seat (11); the limiting member (31) comprises a bending portion (311) and a limiting portion (312); the bending portion (311) is bent from the sealing member (30) toward the first wall surface (1111); the limiting portion (312) extends from the bending portion (311) toward the radial inner side of the sealing member (30); and the limiting portion (312) is connected to the radial outer side of the sealing member (30) through the bending portion (311); The number of the limiting member (31) is one, and along the circumferential direction of the valve device, the limiting member (31) surrounds the radial outer side of the sealing member (30); Alternatively, the number of the limiting members (31) is at least two, and along the circumference of the valve device, a plurality of the limiting members (31) are arranged at intervals on the radial outer side of the sealing member (30).

4. The valve device according to claim 1, It is characterized in that The limiting member (31) is fixedly connected or limit-connected to the valve seat (11) or is an integral structure, and the limiting member (31) is connected to the radial outer side of the valve seat (11).

5. The valve device according to claim 4, It is characterized in that The first wall surface (1111) is located on the valve seat (11), the second wall surface (25) is located on the valve body (20), and the limiting member (31) protrudes from the valve seat (11) toward the second wall surface (25); The number of the limiting member (31) is one, and along the circumferential direction of the valve device, the limiting member (31) surrounds the radial outer side of the first wall surface (1111); Alternatively, the number of the limiting members (31) is at least two, and along the circumference of the valve device, a plurality of the limiting members (31) are arranged at intervals on the radial outer side of the first wall surface (1111).

6. The valve device according to claim 2 or 4, It is characterized in that The sealing member (30) comprises a first portion (301), a second portion (302) and a third portion (303); along the radial direction of the valve device, one end of the third portion (303) is fixedly connected to the first portion (301) or is an integral structure, and the other end of the third portion (303) is fixedly connected to the second portion (302) or is an integral structure; an extension direction of the third portion (303) and an extension direction of the first portion (301) and an extension direction of the second portion (302) both have an angle greater than zero; the first portion (301) abuts against the first wall surface (1111), and the second portion (302) abuts against the second wall surface (25).

7. The valve device according to claim 6, It is characterized in that The valve body (20) includes a step wall (26), and the valve seat (11) includes a main body (111) and an extension portion (112). Along the axial direction of the valve device, the step wall (26) is away from the main body (111) relative to the gap (12), and the extension portion (112) extends from the main body (111) toward the step wall (26); the first portion (301) is arranged in an annular manner on the extension portion (112), and along the radial direction of the valve device, the first portion (301) and the extension portion (112) are abutted or gapped, and the first portion (301) is close to the extension portion (112) relative to the second portion (302), and the extension portion (112) has an abutting wall (1121), and the abutting wall (1121) abuts against the step wall (26).

8. The valve device according to claim 7, It is characterized in that The valve device further comprises a support arm (32), the valve body (20) having a limiting groove (21), the support arm (32) extending radially outward from the main body (111) along the valve device, at least a portion of the support arm (32) being located in the limiting groove (21), and the support arm (32) abutting against a bottom wall forming the limiting groove (21).

9. A valve device according to any one of claims 1 to 5, 7 and 8, It is characterized in that Along the axial direction of the valve body (20), a height H1 of the gap (12) and an overall height H2 of the sealing member (30) before the sealing member (30) is compressed satisfy the following formula: H2>H1.

10. A valve device according to any one of claims 1 to 5, 7 and 8, It is characterized in that The valve body (20) comprises an inlet portion (23) and an outlet portion (24), and the valve device further comprises a valve mouth (13), wherein the valve mouth (13) has a communication portion (131), and the communication portion (131) is communicated with the inlet portion (23).

11. The valve device according to claim 10, It is characterized in that The valve device also includes a first sealing ring (14), the valve mouth (13) has a first sealing groove (132), at least a portion of the first sealing ring (14) is located in the first sealing groove (132) and abuts against the inner wall of the valve body (20); the valve device also includes a valve core (15), the valve mouth (13) has a through hole (133), the valve core (15) can block or open the through hole (133), when the valve core (15) opens the through hole (133), the through hole (133) can connect the inlet portion (23) and the outlet portion (24).

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