Valve device

Abstract

The utility model discloses a valve device which comprises a driving mechanism, a rotating shaft, a movable valve piece and a fixed valve piece, the driving mechanism comprises a driving assembly and a limiting component, the limiting component is provided with at least one connecting part and two limiting end parts, and the two limiting end parts of the limiting component are respectively contacted with a first stopping part or a second stopping part to limit the rotating range; the limiting component is connected with the rotating shaft through the connecting part and drives the rotating shaft to rotate. The rotating shaft is connected with the connecting part to transmit power to the movable valve piece, and the power output process from the rotating shaft to the movable valve piece is only responsible for power transmission and does not need to be limited again, so that the risk of fatigue damage of the rotating shaft is reduced, the rotating shaft is not prone to breakage and failure, and the durability of the valve device is effectively 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 some valve devices, the movable valve member is driven by a rotating shaft to rotate to achieve fluid flow regulation. Figure 1 As shown, the rotating shaft 91 drives the driving rod 92 to rotate, and the driving rod 92 and the movable valve member 94 are relatively fixed, thereby achieving the rotating shaft 91 driving the movable valve member 94 to rotate relative to the fixed valve member 95. In this structure, while the driving rod 92 transmits power to drive the movable valve member 94 to rotate, the stopper 93 limits the rotation range of the driving rod 92, thereby also limiting the rotation range of the rotating shaft 91 and the movable valve member 94. Although this structure can meet functional requirements in short-term use, it has problems during long-term use.

[0003] Because the driving rod 92 must withstand frequent impact loads during rotation, especially when it makes point or line contact with the stopper 93 during position limiting, its weak points are susceptible to fatigue cracks, fractures, and even failure. Furthermore, the connection between the driving rod 92 and the rotating shaft 91 is a stress concentration point, making it prone to loosening or fracture of the rotating shaft 91 due to repeated stress. These issues significantly reduce the reliability and service life of the valve device. Summary of the Invention

[0004] In order to solve the problem of possible breakage or failure of the structure in the valve device and insufficient reliability in the prior art, the purpose of the present utility model is to provide a valve device that reduces the stress burden of a single component by reasonably allocating the limiting function and the power transmission function, thereby greatly improving the reliability and durability of the valve device.

[0005] To achieve the above-mentioned purpose of the utility model, one embodiment of the utility model provides a valve device, including a driving mechanism, a rotating shaft, a movable valve member and a fixed valve member, wherein the driving mechanism drives the rotating shaft to drive the movable valve member to rotate;

[0006] The driving mechanism includes a driving assembly and a limiting member, the limiting member has at least one connecting portion and two limiting end portions, and the valve device further includes a first stop portion and a second stop portion that are spaced apart;

[0007] The driving assembly drives the limiting member to rotate, and the two limiting ends of the limiting member are respectively in contact with the first stop portion or the second stop portion to limit the rotation range;

[0008] The limiting component is connected to the rotating shaft through the connecting portion and drives the rotating shaft to rotate. The rotating shaft is fixedly connected to the movable valve component and drives the movable valve component to rotate relative to the fixed valve component.

[0009] As a further improvement of the present invention, the valve device also includes a valve body, which includes a partition, a first cavity and a second cavity. The partition is located between the first cavity and the second cavity to separate the first cavity and the second cavity. The limiting member is accommodated in the first cavity, the first stop portion and the second stop portion are formed in the first cavity, the movable valve member is accommodated in the second cavity, and the rotating shaft passes through the partition.

[0010] As a further improvement of the present invention, the driving mechanism includes a central gear and multiple planetary gears, the multiple planetary gears are distributed circumferentially around the central gear and meshed with it, and the limiting member is fixedly connected to the planetary gears through multiple connecting structures so as to be driven to rotate by the multiple planetary gears.

[0011] As a further improvement of the present invention, the number of the planetary gears is three; the limiting member includes three positioning holes, which are arranged in a ring along the circumferential direction of the rotation axis of the limiting member, and the connecting structure is configured as a positioning pin, and each of the planetary gears is fixedly connected to the corresponding positioning hole through the positioning pin.

[0012] As a further improvement of the present invention, the rotating shaft is provided with a raised portion, the upper surface of the raised portion is higher than the partition, and the limiting member abuts against the upper surface of the raised portion.

[0013] As a further improvement of the present invention, the position-limiting member further comprises three lower convex portions, the positioning hole is provided above each of the lower convex portions, and the lower surface of the lower convex portion is raised downward relative to the bottom surface of the position-limiting member;

[0014] The limiting member further includes a central convex portion, a lower surface of the central convex portion abuts against an upper surface of the convex portion, and a lower surface of the central convex portion is lower than a lower surface of the lower convex portion.

[0015] As a further improvement of the present invention, the first stop portion and the second stop portion each include an extension arm and a stop protrusion, the extension arm extends from the side wall of the valve body into the first cavity, and the stop protrusion is connected to the end of the extension arm;

[0016] The structure of the extension arm and the stop protrusion is used to ensure that when one of the limiting end portions abuts against the first stop portion, the remaining structure of the movable valve member remains non-contact with the second stop portion, and when the other limiting end portion abuts against the second stop portion, the remaining structure of the movable valve member remains non-contact with the first stop portion.

[0017] As a further improvement of the present invention, on the rotation plane of the movable valve member, the cross-section of the contact position between the stop protrusion and the movable valve member is arc-shaped, and the cross-sections of the contact positions between the two limiting end portions and the first stop portion or the second stop portion are both arc-shaped.

[0018] As a further improvement of the present invention, the first tangential direction of the arc of the contact position between the movable valve member and the first stop portion, and the extending direction of the extending arm of the first stop portion are perpendicular to the first tangential direction;

[0019] The second tangent direction of the arc of the contact position between the movable valve member and the second stop portion is perpendicular to the second tangent direction of the arc.

[0020] As a further improvement of the present invention, the outer contours of the first stop portion and the second stop portion are configured as contact surfaces that match the shape of the contact position of the limiting end portion.

[0021] Compared with conventional technologies, the present invention has the following beneficial effects: the valve device introduces a limiting component into the driving mechanism, and the limiting component only performs a limiting function; the rotating shaft transmits power to the movable valve member by connecting with the connecting portion. During the power output process from the rotating shaft to the movable valve member, it is only responsible for power transmission and does not need to be limited, thereby reducing the risk of fatigue damage to the rotating shaft, effectively improving the durability of the valve device, and significantly enhancing the reliability of the overall structure, so that the valve device can operate stably in a higher-intensity working environment. In addition, because different structures realize different functions, there is no need to integrate multiple functions into the same component, that is, the structure of the valve device is optimized from the perspective of functional separation, and the processing difficulty and assembly complexity of the entire device are also reduced to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a cross-sectional view of a valve device in the prior art;

[0023] Figure 2 This is an exploded view of a valve device according to an embodiment of the present invention;

[0024] Figure 3 This is an exploded view of a limiting member and a valve body according to an embodiment of the present invention;

[0025] Figure 4 This is a longitudinal sectional view of a valve device according to an embodiment of the present invention;

[0026] Figure 5 yes Figure 4 A partial enlarged view of point A in the middle;

[0027] Figure 6This is a structural diagram of a limiting component and a valve body according to an embodiment of the present invention;

[0028] Figure 7 This is a cross-sectional view of a valve device according to an embodiment of the present invention;

[0029] Among them, 100, valve device; 10, drive assembly; 11, central gear; 12, planetary gear; 13, positioning pin; 20, limiting member; 21, connecting part; 22, positioning hole; 23, central convex part; 24, lower convex part; 25, limiting end part; 30, valve body; 31, first chamber; 311, first stop part; 312, second stop part; 313, extension arm; 314, stop protrusion; 32, second chamber; 33, partition; 40, rotating shaft; 41, protrusion; 50, transmission part; 60, movable valve part; 70, fixed valve part; 80, valve seat; L1, rotation axis; 91, rotating shaft; 92, drive rod; 93, stop part; 94, movable valve part; 95, fixed valve part. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] An embodiment of the present invention provides a valve device, which reduces the stress burden of a single component by reasonably allocating a limit function and a power transmission function, thereby greatly improving the reliability and durability of the valve device.

[0033] The valve device 100 of this embodiment is as follows Figure 2 and 4 As shown, the valve seat 80 includes a drive assembly 10, a rotating shaft 40, and a movable valve member 60 and a fixed valve member 70 that abut against each other. The drive assembly 10 drives the rotating shaft 40 to rotate. The valve seat 80 defines an accommodating cavity within which the rotating shaft 40, movable valve member 60, and fixed valve member 70 can be installed. The movable valve member 60 is driven by the rotating shaft 40 and can rotate relative to the fixed valve member 70 about a rotation axis L1. The fixed valve member 70 includes a flow channel opening, which adjusts the opening of the flow channel opening during the rotation of the movable valve plate.

[0034] To clearly illustrate the positions and directions described in this embodiment, the movable valve member 60 is defined as rotating within a horizontal plane, with the fluid flowing downward through the flow passage opening. The horizontal plane is merely a name and is not limited to the physical meaning of "horizontal." Of course, in this preferred embodiment, the horizontal plane corresponds to the horizontal plane in physics, and the downward direction corresponds to the direction of gravity. The rotation axis L1 of the rotating shaft 40 and the movable valve member 60 extends in the vertical direction. The drive assembly 10 is located above the movable valve member 60, and the fixed valve member 70 is located below it.

[0035] The driving mechanism of this embodiment includes a driving assembly 10 and a limiting member 20, such as Figure 3 As shown, the limiting member 20 has at least one connecting portion 21 and two limiting end portions 25. The valve device 100 also includes a first stop portion 311 and a second stop portion 312 spaced apart. The driving assembly 10 drives the limiting member 20 to rotate, and the two limiting end portions 25 of the limiting member 20 respectively contact the first stop portion 311 or the second stop portion 312 to limit the rotation range. The limiting member 20 is connected to the rotating shaft 40 via the connecting portion 21 and drives it to rotate. The rotating shaft 40 is fixedly connected to the movable valve member 60, thereby driving the movable valve member 60 to rotate relative to the fixed valve member 70.

[0036] like Figure 4 As shown, the transmission path of this embodiment is sequentially: drive assembly 10 - limiting member 20 - rotating shaft 40 - movable valve member 60. The limiting member 20 performs the limiting function midway along the transmission path, rather than at the end of the transmission path. This solves the fatigue damage problem caused by the drive rod in the prior art performing both transmission and stopping functions. The drive assembly 10 drives the limiting member 20 to rotate, so that the contact between the limiting member 20 and the first and second stops 311 and 312 limits the rotation range of the rotating shaft 40, ensuring the adjustable opening range of the movable valve member 60. This significantly reduces the continuous impact on the rotating shaft 40, thereby preventing damage to the rotating shaft 40 and the movable valve member 60 due to frequent stress, and improving the service life of the valve device 100.

[0037] Furthermore, the valve device 100 further includes a valve body 30, such as Figure 2 、 3As shown in Figures 6 and 7, the valve body 30 includes a partition 33, a first chamber 31, and a second chamber 32. The partition 33 is located between the first chamber 31 and the second chamber 32 to separate the first chamber 31 and the second chamber 32. The first chamber 31 houses the limiting member 20, and a first stopper 311 and a second stopper 312 are formed in the first chamber 31. The second chamber 32 houses the movable valve member 60, and the rotary shaft 40 passes through the partition 33. The valve body 30 is separated from the first chamber 31 and the second chamber 32 by the partition 33. The first chamber 31 within the partition 33 houses the limiting member 20, while the second chamber 32 houses the movable valve member 60. The separate arrangement of the limiting member 20 and the movable valve member 60 not only prevents interference between them and improves operating efficiency, but also leaves sufficient space in the first chamber 31 to accommodate the limiting member 20, the first stopper 311, and the second stopper 312.

[0038] The drive assembly 10 of this embodiment may include a motor and a gear set, wherein the gear set includes a central gear 11 and a plurality of planetary gears 12, wherein the plurality of planetary gears 12 are circumferentially distributed around the central gear 11 and mesh with the central gear 11, and the limiting member 20 is fixedly connected to the planetary gears 12 via a plurality of connection structures so as to be driven to rotate by the plurality of planetary gears 12. The coordination between the central gear 11 and the plurality of planetary gears 12 makes the power transmission more uniform, avoiding the problem of uneven torque caused by a single gear transmission. The limiting member 20 can rotate smoothly under the drive of the plurality of planetary gears 12, thereby ensuring the continuous stable operation and precise flow control of the valve device 100. In addition, the structure of the plurality of planetary gears 12 helps to share the load, reduces the wear of a single gear, and improves the stability and durability of the valve device 100.

[0039] In this embodiment, there are three planetary gears 12 , which are evenly distributed circumferentially around the central gear 11 to achieve more uniform power distribution. The angles between the centers of adjacent planetary gears 12 and the rotation axis L1 are all 120°.

[0040] Correspondingly, the limiting member 20 includes three positioning holes 22, which are arranged in a ring along the circumferential direction of the rotation axis L1 of the limiting member 20. The connection structure is provided as a positioning pin 13, and each planetary gear 12 is fixedly connected to the corresponding positioning hole 22 via the positioning pin 13. Figure 2 、 6 As shown in FIG. 7 , the included angle between the center of the positioning hole 22 and the rotation axis L1 is also 120°. The cooperation between the positioning pin 13 and the positioning hole 22 ensures the stability of the connection between the planetary gear 12 and the limiting member 20, preventing malfunctions caused by loosening or misalignment during long-term use.

[0041] In addition, the limiting member 20 is symmetrical about three symmetry axes, which are the lines connecting the center of each positioning hole 22 and the rotation axis L1. Figure 7As shown, the cross-section of the limiting member 20 of this embodiment adopts a trident-shaped, or three-leaf-shaped, geometric structure. The center of mass of the limiting member 20 coincides with the rotation axis L1. The trident has three symmetrical branches, or the three-leaf has three blades distributed at equal angles. This geometric shape with multiple symmetry axes can effectively disperse the transmission of force, reduce local stress concentration, and extend the service life of the limiting member 20.

[0042] During the rotation of the limiting member 20 , at least one branch or blade thereof contacts the first stopper 311 and the second stopper 312 in the valve body 30 to limit the rotation range of the rotating shaft 40 .

[0043] Furthermore, if Figure 4 and 5 As shown, the rotating shaft 40 is provided with a protrusion 41, the upper surface of the protrusion 41 is higher than the partition 33, and the limiting member 20 abuts against the upper surface of the protrusion 41, thereby preventing the limiting member 20 from contacting the partition 33. The setting of the protrusion 41 avoids accidental interference of the limiting member 20 during the rotation process, avoids accidental displacement or shaking of the limiting mechanism, and avoids mechanical impact or wear between the limiting member 20 and the partition 33, thereby ensuring the operation accuracy of the valve device 100.

[0044] In addition, the limiting member 20 also includes three lower protrusions 24, and a positioning hole 22 is arranged above each lower protrusion 24, and the lower surface of the lower protrusion 24 protrudes downward relative to the bottom surface of the limiting member 20; the limiting member 20 is arranged in a plate shape, and the arrangement of the lower protrusion 24 provides sufficient depth for the positioning hole 22, so that the bottom of the positioning hole 22 can provide sufficient support for the positioning pin 13.

[0045] The limiting member 20 also includes a central protrusion 23, the lower surface of the central protrusion 23 abuts against the upper surface of the raised portion 41, and the lower surface of the central protrusion 23 is lower than the lower surface of the lower protrusion 24. Since the lower protrusion 24 is provided, the lower protrusion 24 is lower than the bottom surface of the limiting member 20, so there is a risk of contact with the partition 33. By providing the central protrusion 23, the lower surface of the central protrusion 23 is lower than the lower surface of the lower protrusion 24, ensuring that the lower protrusion 24 will never contact the partition 33.

[0046] The valve device 100 further includes a transmission member 50, and the movable valve member 60 includes a fixed portion. The transmission member 50 passes through the rotating shaft 40 and is fixedly connected thereto. The transmission member 50 is relatively fixed to the fixed portion and is used to drive the movable valve member 60 to rotate around the rotating shaft 40. Figure 2As shown, fixed portions are symmetrically disposed on either side of the rotating axis 40 of the movable valve member 60. The fixed portions include a first wall and a second wall, with a fixed groove defined between the first and second walls. The transmission member 50 is configured as a rod and inserted into the fixed groove. The transmission member 50 is equivalent to the drive rod in the prior art. The drive rod in the prior art not only drives but also serves as a position limiter. However, the transmission member 50 of this embodiment only needs to transmit force and does not serve as a position limiter. Therefore, the transmission member 50 of this embodiment is less susceptible to failure. The cooperation between the transmission member 50 and the fixed portion ensures that the movable valve member 60 can accurately rotate about the rotating axis 40, accurately adjusting the open and closed state of the fluid channel, and ensuring the flow control accuracy of the valve device 100.

[0047] In addition, the structural size of the transmission member 50 can be much smaller than that of the limiting member 20, and the limiting function performed by the limiting member 20 can also be more reliable.

[0048] like Figure 3 and 6 As shown, the first stop portion 311 and the second stop portion 312 each include an extension arm 313 and a stop protrusion 314 . The extension arm 313 extends from the side wall of the valve body 30 into the first cavity 31 , and the stop protrusion 314 is connected to the end of the extension arm 313 .

[0049] The structure of the extension arm 313 and the stop protrusion 314 is used to ensure that when one of its limiting end portions 25 abuts against the first stop portion 311, the remaining structure of the movable valve member 60 remains out of contact with the second stop portion 312, and when the other limiting end portion 25 abuts against the second stop portion 312, the remaining structure of the movable valve member 60 remains out of contact with the first stop portion 311. This can avoid the problem of force imbalance caused by multiple points of contact and prevent over-positioning.

[0050] The stop protrusion 314 is thicker than the extension arm 313. This, on the one hand, enhances the structural strength, and also requires a stronger structure to provide support for the position limit at the locations where the first and second stop portions 311, 312 contact the position limiting mechanism. On the other hand, the thinner extension arm 313 prevents the first or second stop portion 311, 312 from contacting the position limiting mechanism when the other one does, thus ensuring the stability of the valve device 100 during high-frequency use and the reliability of long-term operation.

[0051] Further, if Figure 3 、 6As shown in Figures 7 and 8, on the rotational plane of the movable valve member 60, the cross-section of the stop protrusion 314 at the contact position with the movable valve member 60 is arc-shaped, and the cross-sections of the two limiting end portions 25 at the contact positions with the first stop portion 311 or the second stop portion 312 are both arc-shaped. By setting the cross-sections of the parts on both sides of the contact position to be arc-shaped, the arc-shaped cross-section design provides a softer, more gradually transitioned contact surface, making the contact smoother. The arc-shaped contact surface can evenly distribute pressure, avoid stress concentration caused by sharp angles, reduce wear between the first stop portion 311 or the second stop portion 312 and the limiting member 20, enhance the wear resistance and impact resistance of the contact surface, ensure that the valve device 100 can still operate stably during long-term use, avoid the loss of accuracy due to wear, and improve the durability of the valve device 100.

[0052] Furthermore, in the first tangential direction of the arc at the contact position between the movable valve member 60 and the first stop portion 311, the extending direction of the extending arm 313 of the first stop portion 311 is perpendicular to the first tangential direction; in the second tangential direction of the arc at the contact position between the movable valve member 60 and the second stop portion 312, the extending direction of the extending arm 313 of the second stop portion 312 is perpendicular to the second tangential direction.

[0053] On the one hand, the extension arm 313 extends in a direction perpendicular to the tangent, ensuring that the first stopper 311 or the second stopper 312 positively abuts the limiting member 20 when in contact, avoiding wear caused by sliding, thereby preventing wear between parts. In other words, if relative sliding occurs during abutment, wear will increase. The cumulative effect of long-term operation of the valve device 100 will increase wear, and the limiting member 20 will not be able to move into place, which means that the movable valve element 60 will not be able to move into place, and the flow channel opening size will no longer be accurately adjusted. Therefore, the extension direction of the extension arm 313 of the first stopper 311 is perpendicular to the first tangent direction, and the extension direction of the extension arm 313 of the second stopper 312 is perpendicular to the second tangent direction, which can maintain the long-term high-precision operation of the valve device 100.

[0054] On the other hand, the design that the extension direction of the extension arm 313 of the first stop part 311 is perpendicular to the first tangent direction and the extension direction of the extension arm 313 of the second stop part 312 is perpendicular to the second tangent direction can make the contact angle be 90°, avoiding the generation of unbalanced torque and providing good force support.

[0055] In the above-mentioned embodiment, the arc-shaped contact relationship between the first stop portion 311 or the second stop portion 312 and the limiting member 20 is geometrically a line contact relationship. In other embodiments, it can also be a surface contact relationship. The outer contours of the first stop portion 311 and the second stop portion 312 are configured as contact surfaces that match the shape of the contact position of the limiting end portion 25. For example, the outer contours of the first stop portion 311 and the second stop portion 312 are configured as concave shapes, and the shape of the contact position of the limiting end portion 25 is a convex shape that matches the concave shape. By matching the contact surface shapes, it can be ensured that during the operation of the valve device 100, the contact between the stop portion and the limiting end portion 25 is more stable, reducing friction and wear caused by poor contact, helping to extend the service life of the valve device 100, and ensuring that it maintains an efficient and stable working state under high-intensity use environments.

[0056] Compared with the prior art, this embodiment has the following beneficial effects:

[0057] The valve device 100 introduces a limiting member 20 into the driving mechanism, and the limiting member 20 only performs a limiting function; the rotating shaft 40 transmits power to the movable valve member 60 by connecting with the connecting portion 21. During the power output process from the rotating shaft 40 to the movable valve member 60, it is only responsible for power transmission and does not need to be limited. This reduces the risk of fatigue damage to the rotating shaft 40, making it less prone to rupture and failure, effectively improving the durability of the valve device 100 and significantly enhancing the reliability of the overall structure, allowing the valve device 100 to operate stably in a more intense working environment. In addition, since different structures realize different functions, there is no need to integrate multiple functions into the same component. That is, the structure of the valve device 100 is optimized from the perspective of functional separation, and the processing difficulty and assembly complexity of the entire device are also reduced to a certain extent.

[0058] 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.

[0059] 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 drive mechanism, a rotating shaft, a movable valve member, and a fixed valve member, wherein the drive mechanism drives the rotating shaft to drive the movable valve member to rotate, and is characterized in that: The driving mechanism includes a driving assembly and a limiting member, the limiting member has at least one connecting portion and two limiting end portions, and the valve device further includes a first stop portion and a second stop portion that are spaced apart; The driving assembly drives the limiting member to rotate, and the two limiting ends of the limiting member are respectively in contact with the first stop portion or the second stop portion to limit the rotation range; The limiting component is connected to the rotating shaft through the connecting portion and drives the rotating shaft to rotate. The rotating shaft is fixedly connected to the movable valve component and drives the movable valve component to rotate relative to the fixed valve component.

2. The valve device according to claim 1, characterized in that The valve device also includes a valve body, which includes a partition, a first cavity and a second cavity. The partition is located between the first cavity and the second cavity to separate the first cavity and the second cavity. The limiting member is accommodated in the first cavity. The first stop portion and the second stop portion are formed in the first cavity. The movable valve member is accommodated in the second cavity, and the rotating shaft passes through the partition.

3. The valve device according to claim 2, characterized in that The driving mechanism includes a central gear and a plurality of planetary gears, wherein the plurality of planetary gears are circumferentially distributed around the central gear and meshed with the central gear. The limiting member is fixedly connected to the planetary gears through a plurality of connecting structures so as to be driven to rotate by the plurality of planetary gears.

4. The valve device according to claim 3, characterized in that There are three planetary gears; the limiting member includes three positioning holes, which are arranged in a ring along the circumferential direction of the rotation axis of the limiting member; the connecting structure is configured as a positioning pin, and each planetary gear is fixedly connected to the corresponding positioning hole via the positioning pin.

5. The valve device according to claim 4, characterized in that The rotating shaft is provided with a protrusion, the upper surface of the protrusion is higher than the partition, and the limiting member is in contact with the upper surface of the protrusion.

6. The valve device according to claim 5, characterized in that The limiting member further comprises three lower convex portions, the positioning hole is provided above each of the lower convex portions, and the lower surface of the lower convex portion is raised downward relative to the bottom surface of the limiting member; The limiting member further includes a central convex portion, a lower surface of the central convex portion abuts against an upper surface of the convex portion, and a lower surface of the central convex portion is lower than a lower surface of the lower convex portion.

7. The valve device according to claim 2, characterized in that The first stop portion and the second stop portion each include an extension arm and a stop protrusion, the extension arm extending from the side wall of the valve body into the first cavity, and the stop protrusion connected to an end of the extension arm; The structure of the extension arm and the stop protrusion is used to ensure that when one of the limiting end portions abuts against the first stop portion, the remaining structure of the movable valve member remains non-contact with the second stop portion, and when the other limiting end portion abuts against the second stop portion, the remaining structure of the movable valve member remains non-contact with the first stop portion.

8. The valve device according to claim 7, characterized in that On the rotation plane of the movable valve member, the cross section of the contact position between the stop protrusion and the movable valve member is arc-shaped, and the cross sections of the contact positions between the two limiting ends and the first stop portion or the second stop portion are both arc-shaped.

9. The valve device according to claim 8, characterized in that a first tangential direction of the arc of the contact position between the movable valve member and the first stopper, wherein the extending direction of the extending arm of the first stopper is perpendicular to the first tangential direction; The second tangent direction of the arc of the contact position between the movable valve member and the second stop portion is perpendicular to the second tangent direction of the arc.

10. The valve device according to claim 1 or 2, characterized in that The outer contours of the first stop portion and the second stop portion are configured as contact surfaces that match the shape of the contact position of the limiting end portion.

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