Valve device

Abstract

The valve device comprises a rotating shaft, a movable valve piece and a fixed valve piece, the movable valve piece and the fixed valve piece abut against each other, one of the rotating shaft and the movable valve piece is provided with a supporting part, the supporting part makes contact with the other one, and the supporting part is arranged in a shaft hole and arranged in the circumferential direction so as to limit the contact range of the movable valve piece and the rotating shaft; outside the contact range, a gap is formed between the rotating shaft and the movable valve piece, and the contact range and the gap are arranged to enable the movable valve piece to have the freedom degree of rotating around the supporting part so that the movable valve piece can be attached to the fixed valve piece in a sealed mode. By limiting the contact range, a gap formed outside the contact range provides a proper degree of freedom for the movable valve piece, uniform stress of the movable valve piece and the rotating shaft in the assembly process is ensured, the problems of inclination and sealing failure of the movable valve piece caused by too tight assembly are avoided, the phenomenon of transverse displacement of the movable valve piece caused by too loose fit is avoided, and the service life of the movable valve piece is prolonged. Therefore, the assembly reliability and the dynamic stability are improved.

Description

Technical Field

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

[0002] In fluid control devices, the movable valve member of the valve device is usually driven by a rotating shaft and fits with the fixed valve member to control the flow state of the fluid. The manufacturing and assembly accuracy of the movable valve member and the rotating shaft must be high, otherwise the following problems will occur:

[0003] If the fit between the rotating shaft and the movable valve member is too tight (e.g., forming an interference fit), the force between the two is concentrated in a local area, which can easily cause the movable valve member to tilt during assembly due to uneven force, and the movable valve member cannot maintain a stable fit with the fixed valve member. Once the movable valve member tilts, the fit between it and the fixed valve member cannot achieve full surface contact, which will affect the sealing performance.

[0004] If the fit between the rotating shaft and the movable valve member is too loose, that is, the gap between them is large, the movable valve member will have a large degree of freedom in the lateral direction and lack effective support and restraint. During the process of the rotating shaft driving the movable valve member to rotate, the movable valve member may move laterally due to the effects of gravity, centrifugal force, or spring force. Lateral displacement can cause the movable valve member to deviate from the predetermined position, disrupting the matching between the movable valve member and the fixed valve member, resulting in reduced fluid control accuracy and even seal failure.

[0005] The high assembly precision of the moving valve member and the rotating shaft will greatly increase the production precision and assembly precision requirements of the parts, thus greatly increasing the cost. Therefore, the existing valve devices are either expensive or the sealing performance cannot meet the production requirements. Summary of the Invention

[0006] In order to solve the various problems caused by the high fitting precision requirements of valve devices in the prior art, the purpose of the present utility model is to provide a valve device that avoids assembly problems and performance defects caused by overly tight or loose fitting.

[0007] To achieve the above-mentioned purpose of the utility model, one embodiment of the utility model provides a valve device, comprising a rotating shaft, a movable valve member and a fixed valve member abutting against each other, wherein the movable valve member is driven by the rotating shaft and can rotate relative to the fixed valve member about a rotating axis, the movable valve member comprising an axial hole, and the rotating shaft is inserted into the axial hole;

[0008] A support portion is provided on one of the rotating shaft and the movable valve member, and the support portion contacts the other. The support portion is provided in the shaft hole and is arranged along the circumferential direction to limit the contact range between the movable valve member and the rotating shaft. Outside the contact range, a gap is formed in the area between the rotating shaft and the movable valve member. The setting of the contact range and the gap is used to allow the movable valve member to have the freedom to rotate around the support portion, so that the movable valve member and the fixed valve member are sealed and fitted.

[0009] As a further improvement of the present invention, the support portion is configured as a circle of continuous annular protrusions.

[0010] As a further improvement of the present invention, along the rotation axis, the thickness of the annular protrusion is the largest at the middle position, and the thickness gradually decreases from the middle position to both ends;

[0011] The contact range between the movable valve member and the rotating shaft is a line contact that circles the rotating shaft at the middle position.

[0012] As a further improvement of the present invention, the support portion is provided on the outer surface of the rotating shaft, and the support portion contacts the inner wall of the shaft hole.

[0013] As a further improvement of the present invention, along the rotation axis, the outer contour of the annular raised cross section is an arc shape, and the contact range between the movable valve member and the rotation axis is the vertex of the arc away from the rotation axis.

[0014] As a further improvement of the present invention, the support portion and the rotating shaft are integrally formed.

[0015] As a further improvement of the present invention, a circle of annular protrusions is provided between the movable valve member and the rotating shaft, and along the rotation axis, the annular protrusions are located in a middle position between the rotating shaft and the movable valve member.

[0016] As a further improvement of the present invention, the support portion is configured as a plurality of protrusions evenly arranged along the circumferential direction.

[0017] As a further improvement of the present invention, the valve device also includes a clamping element, which is arranged between the rotating shaft and the movable valve member and is used to apply pressure to the movable valve member in the direction of the fixed valve member to maintain the fit between the movable valve member and the fixed valve member.

[0018] As a further improvement of the present invention, the valve device also includes a transmission member, the movable valve member includes a fixed portion, the transmission member passes through the rotating shaft and is fixedly connected thereto, the transmission member is relatively fixed to the fixed portion, and is used to drive the movable valve member to rotate around the rotating shaft.

[0019] Compared with the conventional technology, the utility model has the following beneficial effects: the valve device sets a support portion between the movable valve member and the rotating shaft, which solves the assembly problems and performance defects caused by overtight or overloose fit in the prior art. The support portion limits the contact range so that the gap formed outside the contact range provides the movable valve member with appropriate degrees of freedom, ensuring that the movable valve member and the rotating shaft are evenly stressed during the assembly process, and avoiding the tilting of the movable valve member and the sealing failure caused by overtight assembly. At the same time, the contact range limited by the support portion can avoid the lateral displacement of the movable valve member caused by overly loose fit, thereby improving the assembly reliability and dynamic stability. The valve device improves the tolerance range of the assembly, ensures the sealing performance while relatively reducing the requirements for manufacturing accuracy and assembly accuracy, and obtains stronger market competitiveness with lower cost and higher performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a valve device according to an embodiment of the present invention;

[0021] Figure 2 This is a cross-sectional view of a valve device according to an embodiment of the present invention;

[0022] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle;

[0023] Figure 4 This is a schematic structural diagram of a rotating shaft according to an embodiment of the present invention;

[0024] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle;

[0025] Figure 6 This is a cross-sectional view of a partial structure of a valve device according to another embodiment of the present invention;

[0026] Among them, 100, valve device; 10, rotating shaft; 11, supporting part; 111, apex; 12, first protrusion; 20, moving valve member; 21, axial hole; 211, gap; 2111, accommodating space; 22, second protrusion; 23, fixing part; 30, fixed valve member; 31, fluid channel; 40, valve seat; 50, transmission part; 60, drive assembly; 70, clamping element; 71, compression spring; 72, corrugated spring; L1, rotation axis. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0028] It should be understood that the terms used herein, such as "upper," "above," "lower," and "below," etc., indicating spatial relative positions, are used for ease of explanation to describe the relationship of one element or feature relative to another element or feature as shown in the accompanying drawings. Spatially relative terms may be intended to encompass different orientations of the device in use or operation other than the orientation shown in the drawings.

[0029] An embodiment of the present invention provides a valve device 100, which can avoid tilting caused by overly tight fitting and lateral displacement caused by loose assembly, thereby maintaining sealing during the control process, improving the control accuracy of the valve, and having better assembly reliability and dynamic stability.

[0030] The valve device 100 of this embodiment is as follows Figure 1 and 2 As shown, the valve seat 40 includes a drive assembly 60, a rotating shaft 10, and a movable valve member 20 and a fixed valve member 30 that abut against each other. The drive assembly 60 drives the rotating shaft 10 to rotate. The valve seat 40 defines an accommodating cavity within which the rotating shaft 10, movable valve member 20, and fixed valve member 30 can be mounted. The movable valve member 20 is driven by the rotating shaft 10 and can rotate relative to the fixed valve member 30 about a rotation axis L1. The movable valve member 20 includes an axial hole 21, into which the rotating shaft 10 is inserted. The fixed valve member 30 includes a flow channel opening, which adjusts the opening of the flow channel opening during the rotation of the movable valve plate.

[0031] In the prior art, as described in the background technology, if the processing accuracy and assembly accuracy of the parts are not enough, some problems may occur during the assembly process of the movable valve component 20 and the shaft hole 21. For example, if there is an interference fit or the movable valve component 20 is directly fixed to the rotating shaft 10, rigid interference will occur, or the movable valve component 20 will be subject to too many unnecessary constraints during the rotation process, resulting in tilting, making it difficult to ensure the sealing fit between the movable valve component 20 and the fixed valve component 30; if the gap 211 is fitted, lateral displacement problems may occur due to an overly loose fit, and the sealing between the movable valve component 20 and the fixed valve component 30 cannot be ensured.

[0032] In this embodiment, a support portion 11 is provided on one of the rotating shaft 10 and the movable valve member 20, and the support portion 11 contacts the other. The support portion 11 is disposed within the shaft hole 21 and is arranged along the circumference to limit the contact range between the movable valve member 20 and the rotating shaft 10. The support portion 11 may be a support structure fixed to one of the rotating shaft 10 and the movable valve member 20. The contact range between the support structure and the other is much smaller than the area where the rotating shaft 10 and the shaft hole 21 are completely in contact with each other in the prior art.

[0033] Outside the contact range, a gap 211 is formed between the rotating shaft 10 and the movable valve member 20. The contact range and the gap 211 are set to allow the movable valve member 20 to have the freedom to rotate around the support portion 11, so that the movable valve member 20 and the fixed valve member 30 are sealed and fitted. Figure 3 As shown, through the gap 211, the movable valve member 20 and the rotating shaft 10 maintain an appropriate degree of freedom, preventing tilting caused by interference fit and displacement caused by loose fit.

[0034] In order to clearly express the position and direction described in this embodiment, in this embodiment, the movable valve member 20 is defined to rotate in a horizontal plane, and the fluid flows in a top-down direction when passing through the flow channel opening. The horizontal plane is only a name definition and is not limited to the "horizontal" in the physical sense. Of course, in the preferred embodiment, the horizontal plane is correspondingly parallel to the horizontal plane in physics, and the top-down direction is the direction of gravity.

[0035] Specifically, although ideally, the movable valve member 20 adjusts the opening of the flow channel when rotating in the horizontal plane, on the one hand, due to machining errors and assembly errors on the surface of the parts, the movable valve member 20 may not rotate in an absolutely horizontal direction to maintain sealing. That is, if the movable valve member 20 is restricted from rotating in an absolutely horizontal direction through assembly, sealing may not be possible. On the other hand, as mentioned above, due to errors and interference fit, the movable valve member 20 cannot maintain horizontal rotation and may tilt, which also leads to sealing failure.

[0036] In this embodiment, by limiting the contact range, a gap 211 is maintained between the rotating shaft 10 and the movable valve member 20 outside the contact range. The positional relationship between the rotating shaft 10 and the movable valve member 20 can be freely adjusted to a certain extent within the gap 211 area. For example, the rotating shaft 10 and the movable valve member 20 can be relatively tilted or twisted. The movable valve member 20 has the freedom to rotate around the support portion 11. This degree of freedom includes other degrees of freedom in addition to the degree of freedom of rotation around the rotation axis L1. This degree of freedom ensures that the movable valve member 20 and the fixed valve member 30 are sealed and fit.

[0037] When the movable valve member 20 is required to rotate in a non-absolute horizontal manner to maintain sealing, the movable valve member 20 adjusts its posture by tilting or twisting around the support portion 11 to achieve a non-horizontal rotation posture to meet the requirement of sealing and fitting with the fixed valve member 30.

[0038] When the movable valve component 20 needs to rotate absolutely horizontally to maintain sealing, that is, the fitting surface of the fixed valve component 30 needs to be perpendicular to the rotation axis L1, the movable valve component 20 does not need to be additionally tilted or twisted. The setting of the contact range and the gap 211 can prevent the movable valve component 20 from tilting or twisting. In other words, no rigid constraint is formed on the movable valve component 20, so that it can achieve a horizontal rotation posture and meet the requirement of sealing fit with the fixed valve component 30.

[0039] The contact range and gap 211 provide a flexible constraint mechanism, allowing the movable valve member 20 to rotate in various positions while maintaining a sealed fit with the fixed valve member 30. Furthermore, this dynamic adjustment capability is particularly important in situations where manufacturing tolerances are large or assembly errors occur, to avoid sealing failure or inflexible operation due to rigid interference.

[0040] In addition, the contact range limited by the support portion 11 can also prevent the movable valve member 20 from generating lateral displacement due to an overly loose fit. If the fit between the movable valve member 20 and the rotating shaft 10 is too loose, the movable valve member 20 will obtain a greater degree of freedom during rotation, especially in the radial direction of the rotating shaft 10. An excessively large gap 211 may cause the movable valve member 20 to undergo lateral displacement during rotation or operation. This displacement may cause the movable valve member 20 to deviate from its ideal position, affect the precise control of the fluid channel 31, and may even cause sealing failure. The accumulation of lateral displacement will cause the sealing surface of the valve device 100 to be unable to fully contact, thereby destroying the sealing performance and affecting the working efficiency of the valve. The support portion 11 limits the freedom of the movable valve member 20 to translate in the radial direction relative to the rotating shaft 10, prevents the movable valve member 20 from undergoing excessive lateral displacement, and ensures that the movable valve member 20 always remains on the predetermined track during rotation.

[0041] Therefore, the synergistic effect of the contact range limited by the support portion 11 and the design of the gap 211 can not only effectively prevent the lateral displacement problem of the movable valve component 20 caused by the loose fit between the rotating shaft 10 and the movable valve component 20, but also avoid the tilting problem caused by the interference fit, thereby ensuring the sealing performance and fluid control accuracy of the movable valve component 20 and the fixed valve component 30.

[0042] Furthermore, the support portion 11 of this embodiment may be a structure of an annular protrusion, distributed protrusions, etc. For example, the support portion 11 is configured as a circle of continuous annular protrusions. Figure 4 and 5As shown, the annular protrusions of the support portion 11 are evenly arranged along the circumferential direction of the rotating shaft 10, especially the continuous annular design, thereby ensuring uniform transmission of the supporting force during rotation, forming a reliable support between the rotating shaft 10 and the movable valve member 20, avoiding uneven pressure distribution, and ensuring symmetry and stability during assembly.

[0043] like Figure 3 and 5 As shown, along the rotation axis L1, the annular protrusion has the greatest thickness at its center, and the thickness gradually decreases from the center toward the ends. The larger thickness in the center concentrates the supporting force, improving the supporting effect and preventing uneven force on the movable valve member 20. The gradually decreasing thickness from the center toward the ends not only reduces the contact area, but also further narrows the contact range, resulting in smoother contact. A smaller contact range means greater freedom, allowing the movable valve member 20 to more easily rotate about the support portion 11.

[0044] In this embodiment, the contact range between the movable valve member 20 and the rotating shaft 10 is a line contact extending around the rotating shaft 10 at the midpoint. Compared to surface contact, line contact minimizes the contact area, providing a higher degree of rotational freedom. Line contact ensures that when the support portion 11 contacts another component, the contact area is a narrow, linear region, rather than a large, surface area. In this embodiment, line contact occurs only at the edge of the annular protrusion, with the remaining area forming a gap 211.

[0045] Furthermore, the support portion 11 is provided on the outer surface of the rotating shaft 10, and the support portion 11 contacts the inner wall of the shaft hole 21, as shown in FIG. Figure 4 and 5 As shown, this not only facilitates the processing and fixation of the support portion 11 , but also facilitates the processing of the shaft hole 21 , and ensures the position fixity of the support portion 11 and the stability of the supporting effect.

[0046] Along the rotation axis L1, the outer contour of the annular raised cross section is an arc, and the contact range between the movable valve member 20 and the rotating shaft 10 is at the vertex 111 of the arc, away from the rotating shaft 10. The arc-shaped cross-section design provides a softer, more gradual contact surface, making contact smoother, avoiding stress concentration caused by sharp angles, and reducing wear between the rotating shaft 10 and the shaft hole 21. Furthermore, the contact range is located at the vertex 111 of the arc, away from the rotating shaft 10, ensuring more precise contact and even distribution of contact force, thereby improving the smoothness and sealing of the rotation process.

[0047] The support portion 11 and the rotating shaft 10 are integrally formed, and the connection between the two is tighter and more secure, which improves the bonding strength between the support portion 11 and the rotating shaft 10, reduces errors during the assembly process, and avoids displacement or loosening problems that may occur during the assembly process, thereby improving the stability and durability of the overall structure, and further ensuring the precise fit between the movable valve member 20 and the rotating shaft 10, thereby enhancing the sealing and control accuracy of the valve device 100.

[0048] Continue as Figure 3 As shown, an annular protrusion is disposed between the movable valve member 20 and the rotating shaft 10, and along the rotation axis L1, the annular protrusion is located midway between the rotating shaft 10 and the movable valve member 20. This provides symmetry in the contact area. When the movable valve member 20 needs to twist or tilt, both the upper and lower parts have the same torsional range, avoiding the problem of tilting only toward one side or tilting more toward one side and less toward the other during assembly. Furthermore, the mid-position position also ensures a more uniform force exerted by the rotating shaft 10 on the movable valve member 20.

[0049] In other embodiments, the support portion 11 is configured as a plurality of protrusions evenly arranged along the circumference of the rotating shaft 10. Each protrusion contacts the inner surface of the movable valve member 20, providing uniform support force. The multiple protrusions can also evenly distribute the support force, avoiding the problem of uneven force caused by non-uniform point contact. It also effectively reduces the contact range and achieves a higher degree of freedom of rotation.

[0050] Furthermore, the valve device 100 further includes a pressing element 70, which is disposed between the rotating shaft 10 and the movable valve member 20 and is configured to apply pressure to the movable valve member 20 in the direction of the fixed valve member 30 to maintain the fit between the movable valve member 20 and the fixed valve member 30. The design of the pressing element 70 can be in different forms, and two embodiments are described below:

[0051] In one embodiment, Figure 3 As shown, the pressing element 70 is a compression spring 71, which applies a pre-tightening force to the movable valve member 20 to ensure that the movable valve member 20 and the fixed valve member 30 always maintain a good fit under different working environments, thereby improving the sealing performance of the valve device 100 and preventing sealing failure due to external pressure changes or vibrations.

[0052] In this embodiment, the rotating shaft 10 includes a first protrusion 12, the movable valve member 20 includes a second protrusion 22, and the gap 211 includes an accommodating space 2111. The first protrusion 12 is located on the outer surface of the rotating shaft 10, the second protrusion 22 is located on the inner surface of the movable valve member 20, and the accommodating space 2111 is located between the first protrusion 12 and the second protrusion 22. It accommodates the compression spring 71 and ensures that it does not pop out when properly compressed and elastic force is applied.

[0053] Figure 3 In the illustrated structure, the compression spring 71 is located within the accommodating space 2111. The ends of the compression spring 71 contact the first protrusion 12 and the second protrusion 22, respectively, thereby applying pressure to push the movable valve member 20 toward the fixed valve member 30, ensuring that the movable valve member 20 always maintains sealing contact with the fixed valve member 30. The elastic force of the compression spring 71 is closely related to the size of the accommodating space 2111. During design, the spring stiffness and the size of the gap 211 must be adjusted according to the fluid pressure and sealing requirements.

[0054] In another embodiment, Figure 6 As shown, the compression element 70 is a corrugated spring 72. The elastic properties of its corrugated shape enable the corrugated spring 72 to continuously apply stable pressure during the rotation of the movable valve member 20, thereby preventing the gap 211 between the movable valve member 20 and the fixed valve member 30 from becoming excessively large and maintaining a stable sealing effect. The corrugated spring 72 can also adapt to different working environments and prevent seal failure caused by changes in external loads.

[0055] Figure 6 In the structure shown, the corrugated spring 72 is disposed between the first protrusion 12 and the movable valve member 20. The corrugated spring 72 contacts the first protrusion 12 and applies pressure to push the movable valve member 20 toward the fixed valve member 30 to ensure sealing contact.

[0056] Furthermore, unlike the compression spring 71 , the corrugated spring 72 can provide a smoother and more uniform pressure distribution, and is particularly suitable for applications requiring fine adjustment of the sealing pressure.

[0057] On the one hand, the pressing element 70 effectively pre-tightens the movable valve member 20, thereby ensuring the sealing between the movable valve member 20 and the fixed valve member 30. On the other hand, the pressing element 70 also cooperates with the contact range and the gap 211 to ensure that the movable valve member 20 is in a sealed fit with the fixed valve member 30 in either a twisted or horizontal manner. Even if the valve device 100 is inverted and the movable valve member 20 does not fall on the fixed valve member 30 due to gravity, or even if the fixed valve member 30 cannot be directly pressed against the fixed valve member 30 by the rotating shaft 10 due to assembly errors, the pressing element 70 can still ensure the fit. Therefore, the pressing element 70 adapts to small assembly errors and ensures the stability of the sealing performance.

[0058] In addition, the valve device 100 further includes a transmission member 50 , the movable valve member 20 includes a fixing portion 23 , the transmission member 50 passes through the rotating shaft 10 and is fixedly connected thereto, and the transmission member 50 is relatively fixed to the fixing portion 23 for driving the movable valve member 20 to rotate around the rotating shaft 10 .

[0059] like Figure 1As shown, a fixing portion 23 is symmetrically provided on both sides of the rotating axis 10 of the movable valve member 20. The fixing portion 23 includes a first wall and a second wall, and a fixing groove is enclosed between the first wall and the second wall. The transmission member 50 is configured as a rod and is inserted into the fixing groove. In other words, the fixing portion 23 of this embodiment fixes the transmission member 50 only in the horizontal plane, rather than in the vertical direction. This allows the transmission member 50 to push the first wall or the second wall in the horizontal plane to rotate the movable valve member 20, and also to tilt or twist from above between the fixing groove. In this way, when the movable valve member 20 needs to tilt or twist between the rotating axis 10 to seal with the fixed valve member 30, the design of the first wall, the second wall, and the fixing groove will not hinder the movement of the movable valve member 20.

[0060] In addition, the cooperation between the transmission member 50 and the fixing portion 23 ensures that the movable valve member 20 can accurately rotate around the rotating shaft 10, accurately adjust the opening and closing state of the fluid channel 31, and ensure the flow control accuracy of the valve device 100.

[0061] Compared with the prior art, this embodiment has the following beneficial effects:

[0062] The valve device 100 is provided with a support portion 11 between the movable valve member 20 and the rotating shaft 10, which solves the assembly problems and performance defects caused by overtight or overloose fit in the prior art. The support portion 11 limits the contact range so that the gap 211 formed outside the contact range provides the movable valve member 20 with appropriate degrees of freedom, ensuring that the movable valve member 20 and the rotating shaft 10 are evenly stressed during the assembly process, thereby avoiding the tilting of the movable valve member 20 and the sealing failure caused by overtight assembly. At the same time, the contact range limited by the support portion 11 can avoid the lateral displacement of the movable valve member 20 caused by overly loose fit, thereby improving the assembly reliability and dynamic stability. The valve device 100 increases the tolerance range of assembly, ensures sealing performance while relatively reducing the requirements for manufacturing accuracy and assembly accuracy, and achieves stronger market competitiveness with lower cost and higher performance.

[0063] It should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation method can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0064] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A valve device comprising a rotating shaft, a movable valve member and a fixed valve member abutting each other, wherein the movable valve member is driven by the rotating shaft and can rotate relative to the fixed valve member about a rotating axis, the movable valve member including an axial hole, the rotating shaft being inserted into the axial hole, characterized in that: A support portion is provided on one of the rotating shaft and the movable valve member, and the support portion contacts the other. The support portion is provided in the shaft hole and is arranged along the circumferential direction to limit the contact range between the movable valve member and the rotating shaft. Outside the contact range, a gap is formed in the area between the rotating shaft and the movable valve member. The setting of the contact range and the gap is used to allow the movable valve member to have the freedom to rotate around the support portion, so that the movable valve member and the fixed valve member are sealed and fitted.

2. The valve device according to claim 1, characterized in that The support portion is configured as a circle of continuous annular protrusions.

3. The valve device according to claim 2, characterized in that Along the rotation axis, the thickness of the annular protrusion is the largest at the middle position, and the thickness gradually decreases from the middle position to both ends; The contact range between the movable valve member and the rotating shaft is a line contact that circles the rotating shaft at the middle position.

4. The valve device according to claim 3, characterized in that The support portion is provided on the outer surface of the rotating shaft, and the support portion contacts the inner wall of the shaft hole.

5. The valve device according to claim 4, characterized in that Along the rotation axis, the outer contour of the cross section of the annular protrusion is an arc shape, and the contact range between the movable valve member and the rotation axis is the vertex of the arc away from the rotation axis.

6. The valve device according to claim 4, characterized in that The support portion and the rotating shaft are integrally formed.

7. The valve device according to claim 2, characterized in that A circle of annular protrusions is provided between the movable valve member and the rotating shaft, and along the rotation axis, the annular protrusions are located at a middle position between the rotating shaft and the movable valve member.

8. The valve device according to claim 1, wherein The supporting portion is configured as a plurality of protrusions evenly arranged along the circumferential direction.

9. The valve device according to claim 1, characterized in that The valve device further includes a pressing element, which is arranged between the rotating shaft and the movable valve member and is used to apply pressure to the movable valve member in a direction toward the fixed valve member to maintain the fit between the movable valve member and the fixed valve member.

10. The valve device according to claim 1, wherein The valve device further includes a transmission member, the movable valve member includes a fixed portion, the transmission member passes through the rotating shaft and is fixedly connected thereto, the transmission member and the fixed portion are relatively fixed to drive the movable valve member to rotate around the rotating shaft.

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