A valve device

Abstract

A valve device includes a valve stem, a base, and a limiting member. The base has a limiting groove and a valve stem hole, the limiting groove being separate from the valve stem hole. The valve stem is rotatably connected to the side wall forming the valve stem hole. The limiting member is fixed to the valve stem, limited by a limiting connection, or is an integral structure. The limiting member includes a limiting portion, and at least part of the wall forming the limiting groove can limit the movement range of the limiting portion. The base includes a first end wall and a second end wall, located on opposite sides of the base along its axial direction. The limiting groove has a first opening and a second opening, the first opening being located on the first end wall and the second opening being located on the second end wall. The valve device has a valve cavity and a driving cavity, located on opposite sides of the base along the axial direction of the valve stem. The first opening communicates with the driving cavity, and the second opening communicates with the valve cavity. This arrangement facilitates the removal of foreign objects from inside the valve device and the miniaturization of the valve device.

Description

Technical Field

[0001] This application relates to the field of thermal management technology, specifically to a valve device for vehicles. Background Technology

[0002] Valve devices are used in thermal management technology to control fluid movement. In related technologies, valve devices include valve bodies, valve core assemblies, and drive assemblies. The drive assemblies can drive the valve core assemblies to move. The drive assemblies have drive chambers, and foreign objects may be generated in the drive chambers. These foreign objects may hinder the operation of the drive assemblies, thereby increasing the working resistance of the drive assemblies. Therefore, it is necessary to design a valve device that can facilitate the discharge of foreign objects from the drive chambers. Summary of the Invention

[0003] The purpose of this application is to provide a valve device that facilitates the discharge of foreign objects from inside the drive chamber.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] A valve device includes a valve stem, a base, and a limiting member. The base has a limiting groove and a valve stem hole, the limiting groove being separately disposed from the valve stem hole. The valve stem is rotatably connected to a side wall forming the valve stem hole. The limiting member is fixed to the valve stem, limitedly connected, or integrally formed with it. The limiting member includes a limiting portion, and at least part of the wall forming the limiting groove is capable of limiting the movement range of the limiting portion. The base includes a first end wall and a second end wall, located on opposite sides of the base along its axial direction. The limiting groove has a first opening and a second opening, the first opening being located on the first end wall and the second opening being located on the second end wall. The valve device has a valve cavity and a driving cavity, located on opposite sides of the base along the axial direction of the valve stem. The first opening communicates with the driving cavity, and the second opening communicates with the valve cavity.

[0006] In one technical solution provided in this application, the limiting groove and the valve stem hole are separately configured. The first port is located on the first end wall, and the second port is located on the second end wall. The first port is connected to the drive cavity, and the second port is connected to the valve cavity. With this configuration, the limiting groove and the valve stem hole are separated, and foreign objects inside the drive cavity can be discharged from the drive cavity through the limiting groove to the valve cavity. This reduces the risk of foreign objects getting stuck between the valve stem and the wall forming the valve stem hole, which is beneficial for discharging foreign objects from the drive cavity. The wall forming the limiting groove can also limit the movement range of the limiting part, which is beneficial for the miniaturization of the valve device. Attached Figure Description

[0007] Figure 1 This is a three-dimensional structural schematic diagram of the valve device provided in this application;

[0008] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure along the AA direction;

[0009] Figure 3 yes Figure 2 Enlarged structural diagram at point B (first embodiment of the limiting groove);

[0010] Figure 4 This is a partially enlarged cross-sectional view of the second embodiment of the limiting groove;

[0011] Figure 5 This is an exploded structural diagram of the valve stem, base, and limiting component (first embodiment of the limiting groove);

[0012] Figure 6 This is a bottom view structural diagram of the assembly of the valve stem, base, and limiting component (first embodiment of the limiting groove);

[0013] Figure 7 This is a bottom view of the assembly structure of the valve stem, base, and limiting components;

[0014] Figure 8 This is an enlarged schematic diagram of the valve stem.

[0015] Figure 9 This is an enlarged structural schematic diagram of the base (first embodiment of the limiting groove);

[0016] Figure 10 This is an enlarged structural diagram of the limiting component.

[0017] Figure label:

[0018] 1. Valve body; 2. Drive assembly; 3. Valve core assembly; 4. Valve stem; 5. Base; 6. Limiting element;

[0019] 10. Valve chamber; 11. First channel; 12. Second channel;

[0020] 20. Driving cavity;

[0021] 41. Large diameter section; 42. Small diameter section; 43. Stepped section;

[0022] 50. Limiting groove; 51. Valve stem hole; 52. First end wall; 53. Second end wall; 54. Limiting channel; 55. Guide channel;

[0023] 61. Connecting part; 62. Limiting part;

[0024] 100. Valve device;

[0025] 501, First opening; 502, Second opening; 503, First limiting wall; 504, Second limiting wall; 505, Connecting channel; 610, Socket; 611, Cantilever. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0027] Combination Figures 1 to 10 The diagram illustrates one embodiment of a valve device 100. In this embodiment, the valve device 100 includes a valve body 1, a drive assembly 2, and a valve core assembly 3. The valve device 100 has a valve cavity 10. The valve body 1 has a first channel 11 and a second channel 12. The first channel 11 communicates with the valve cavity 10, and the second channel 12 communicates with the valve cavity 10. The drive assembly 2 has a drive chamber 20, which drives the valve core assembly 3 to rotate within the valve cavity 10. The valve core assembly 3 can open and close the second channel 12. The valve device 100 also includes a valve stem 4, a base 5, and a limiting member 6. The base 5 has a limiting groove 50 and a valve stem hole 51. The limiting groove 50 and the valve stem hole 51 are separately disposed. The valve stem 4 is rotatably connected to the side wall forming the valve stem hole 51. The limiting member 6 is connected to the valve... The rod 4 is fixed, limited, or integrated. The limiting member 6 includes a limiting part 62, and the wall that at least partially forms the limiting groove 50 can limit the movement range of the limiting part 62. Specifically, the base 5 includes a first end wall 52 and a second end wall 53. Along the axial direction of the base 5, the first end wall 52 and the second end wall 53 are located on opposite sides of the base 5. The limiting groove 50 has a first opening 501 and a second opening 502. The first opening 501 is located on the first end wall 52, and the second opening 502 is located on the second end wall 53. The valve device 100 has a valve chamber 10 and a drive chamber 20. Along the axial direction of the valve rod 4, the valve chamber 10 and the drive chamber 20 are located on opposite sides of the base 5. The first opening 501 is directly connected to the drive chamber 20, and the second opening 502 is directly connected to the valve chamber 10.

[0028] The first port 501 is directly connected to the drive chamber 20, and the second port 502 is directly connected to the valve chamber 10. This arrangement facilitates the discharge of foreign objects inside the drive chamber 20 through the limiting groove 50 into the valve chamber 10. Specifically, when the valve device 100 is open, the refrigerant enters the valve chamber 10 through the first channel 11, flows through the limiting groove 50, and enters the drive chamber 20. When the valve device 100 is closed, foreign objects inside the drive chamber 20 will flow with the refrigerant through the limiting groove 50 into the valve chamber 10 and be discharged through the second channel 12. (It is worth noting that the foreign objects inside the drive chamber 20 mostly originate from debris generated by gear meshing and collision.)

[0029] The wall that forms at least part of the limiting groove 50 can limit the movement range of the limiting part 62, and the limiting groove 50 is set separately from the valve stem hole 51. With this configuration, the limiting groove 50 has two functions at the same time: limiting the limiting part 62 and discharging foreign objects. This can reduce the processing steps of the base 5 and help reduce the processing cost of the base 5.

[0030] The limiting groove 50 is separated from the valve stem hole 51. With this separation, foreign objects inside the drive cavity 20 can be discharged from the drive cavity 20 through the limiting groove 50 to the valve cavity 10, reducing the risk of foreign objects getting stuck between the valve stem 4 and the wall forming the valve stem hole 51. This facilitates the discharge of foreign objects from the drive cavity 20. The wall forming the limiting groove 50 can also limit the movement range of the limiting part 62, which is beneficial for the miniaturization of the valve device 100.

[0031] Combination Figures 2 to 6 as well as Figure 9 As shown, along the axial direction of the valve stem 4, at least a portion of the projection of the first port 501 coincides with at least a portion of the projection of the second port 502. Specifically, in this embodiment, along the axial direction of the valve stem 4, the second port 502 is located within the projection of the first port 501. Of course, in other embodiments, the projection direction of the first port 501 may also have a non-zero angle with the valve stem 4.

[0032] Along the axial direction of the valve stem 4, at least a portion of the projection of the first port 501 coincides with at least a portion of the projection of the second port 502; this arrangement can improve the smoothness of the cold medium and foreign objects passing through the limiting groove 50, which is beneficial for discharging foreign objects inside the drive cavity 20.

[0033] Combination Figures 2 to 6 as well as Figure 9As shown, the limiting groove 50 is located radially outside the valve stem hole 51. The limiting groove 50 includes a limiting channel 54. The wall forming the limiting channel 54 includes a first limiting wall 503 and a second limiting wall 504. At least a portion of the limiting part 62 can move inside the limiting channel 54. Along the moving direction of the limiting part 62, the first limiting wall 503 is located at one end of the limiting channel 54, and the second limiting wall 504 is located at the other end of the limiting channel 54. The limiting part 62 can abut against the first limiting wall 503 and the second limiting wall 504. The limiting channel 54 includes a connecting channel 505. The connecting channel 505 includes the space between the wall forming the limiting groove 50 and the limiting part 62. The connecting channel 505 is located in the middle of the limiting channel 54. The proportion ranges from 50% to 98%. Specifically, in this embodiment, the limiting channel 54 is an arc-shaped channel, the first limiting wall 503 is an arc-shaped inner wall, the second limiting wall 504 is an arc-shaped inner wall, the inner diameter of the first limiting wall 503 and the inner diameter of the second limiting wall 504 are approximately equal, the limiting part 62 is a cylinder, and the outer diameter of the limiting part 62 is approximately equal to the inner diameter of the first limiting wall 503. Of course, in other embodiments, the first limiting wall 503 can also be a flat wall or an irregular wall, and the second limiting wall 504 can also be a flat wall or an irregular wall. In the corresponding embodiment, the outer wall of the limiting part 62 that abuts against the first limiting wall 503 fits with the first limiting wall 503, and the outer wall of the limiting part 62 that abuts against the second limiting wall 504 fits with the second limiting wall 504.

[0034] The limiting channel 54 is located radially outside the valve stem hole 51. Since the distance between the axis of the first limiting wall 503 and the valve stem hole 51 is proportional to the torque of the limiting part 62, and the distance between the axis of the second limiting wall 504 and the valve stem hole 51 is proportional to the torque of the limiting part 62, the limiting part 62 and the first limiting wall 503 can brake the valve stem 4 with a small contact pressure, and the limiting part 62 and the second limiting wall 504 can brake the valve stem 4 with a small contact pressure.

[0035] The connecting channel 505 includes the space between the wall forming the limiting channel 54 and the limiting part 62; this arrangement allows the remaining space inside the limiting channel 54 to be used for the passage of the cooling medium, which on the one hand simplifies the processing steps of the base 5; on the other hand, the remaining space of the limiting channel 54 can be used to simplify the structure of the base 5 and improve the compactness of the base 5.

[0036] The proportion of the connecting channel 505 in the limiting channel 54 is between 50% and 98%. This setting can ensure the utilization rate of the limiting channel 54, and the fluid medium can pass smoothly through the connecting channel 505 without the need to open an additional channel between the drive chamber 20 and the valve chamber 10.

[0037] Combination Figure 2 , Figure 3 , Figure 5 , Figure 6 as well as Figure 9 As shown, in the first embodiment of the limiting groove 50, the wall forming the limiting channel 54 can guide the movement of the limiting part 62; along the radial direction of the valve stem 4, the gap between the limiting part 62 and any side wall forming the limiting channel 54 is less than 5% of the height of the wall forming the limiting channel 54; specifically, the height direction of the limiting channel 54 refers to the axial direction of the valve stem 4.

[0038] The gap between the limiting part 62 and any side wall forming the limiting channel 54 is less than 5% of the height of the wall forming the limiting channel 54. With this arrangement, the opposing side walls forming the limiting channel 54 can provide torque to the limiting part 62 along its own radial direction along the radial direction of the valve stem 4, reducing the risk of the limiting part 62 rotating and deforming along its own radial direction under the action of gravity or other external or internal forces.

[0039] refer to Figure 2 , Figure 3 , Figure 5 , Figure 6 as well as Figure 9 As shown, combined with Figure 4 In a second embodiment of the limiting groove 50, the limiting groove 50 further includes a guide channel 55, which is connected to the limiting channel 54. The guide channel 55 includes a first opening 501, and the area of ​​the guide channel 55 is larger than the area of ​​the limiting channel 54. The area of ​​the guide channel 55 decreases in the direction from the guide channel 55 to the limiting channel 54. Specifically, in this embodiment, the wall forming the guide channel 55 includes an inclined plane wall or an arcuate wall. The area of ​​the guide channel 55 decreases in the direction from the first opening 501 to the second opening 502. In other embodiments, the wall forming the limiting groove 50 can be a curved wall or a combination of a curved wall and a plane wall.

[0040] The area of ​​the guide channel 55 is larger than that of the limiting channel 54. The area of ​​the guide channel 55 is reduced in the direction from the guide channel 55 to the limiting channel 54. With this setting, the area of ​​the first opening 501 is larger, which is conducive to foreign objects inside the drive cavity 20 entering the guide channel 55, flowing through the connecting channel 505, and thus facilitating the discharge of foreign objects.

[0041] The wall forming the guide channel 55 includes an inclined plane wall; this design facilitates the smooth discharge of foreign objects from the guide channel 55 and reduces the risk of foreign objects remaining in the wall forming the guide channel 55.

[0042] Combination Figures 2 to 5 as well as Figure 8As shown, the valve stem 4 includes a large-diameter portion 41 and a small-diameter portion 42. The small-diameter portion 42 is rotatably connected to the side wall forming the valve stem hole 51. A stepped portion 43 is provided between the large-diameter portion 41 and the small-diameter portion 42. The minimum outer diameter of the stepped portion 43 is greater than the inner diameter of the valve stem hole 51. The maximum distance between the wall forming the first opening 501 and the axis of the valve stem 4 is greater than the minimum outer diameter of the stepped portion 43. Specifically, in this embodiment, the stepped portion 43 is a circular stepped wall, and the first opening 501 is an arc-shaped groove. The inner diameter of the arc-shaped inner wall forming the first opening 501 near the valve stem 4 is greater than the outer diameter of the stepped portion 43. In other embodiments, the stepped portion 43 can be an irregularly shaped wall, and the first opening 501 can also be an irregularly shaped opening.

[0043] The maximum distance between the wall forming the first opening 501 and the axis of the valve stem 4 is greater than the minimum outer diameter of the step portion 43. With this arrangement, at least part of the first opening 501 is open along the axial direction of the valve stem 4, which is beneficial for foreign objects inside the drive cavity 20 to be discharged into the valve cavity 10 through the limiting groove 50.

[0044] Combination Figure 2 and Figure 3 As shown, along the axial direction of the valve stem 4, the base 5 is located between the connecting portion 61 and the stepped portion 43; the stepped portion 43 has an axial distance from the first end wall 52, and / or the connecting portion 61 has an axial distance from the second end wall 53. Specifically, in this embodiment, along the axial direction of the valve stem 4, the distance between the stepped portion 43 and the connecting portion 61 is greater than the thickness of the base 5.

[0045] The stepped portion 43 has an axial distance from the first end wall 52, and / or the connecting portion 61 has an axial distance from the second end wall 53. With this arrangement, the axial distance between the stepped portion 43 and the first end wall 52 is related to the direction of gravity, and the axial distance between the connecting portion 61 and the second end wall 53 is related to the direction of gravity. Regardless of the angle at which the valve device 100 is placed, this arrangement helps to reduce the rotational resistance of the valve stem 4.

[0046] Combination Figures 2 to 7As shown, the stepped portion 43 is located in the drive chamber 20, and the connecting portion 61 is located in the valve chamber 10. Specifically, along the axial direction of the valve stem 4, at least part of the projection of the connection between the connecting portion 61 and the limiting portion 62 covers the second opening 502. With this arrangement, on the one hand, when the valve device 100 is in the open state and the refrigerant enters the drive chamber 20 from the valve chamber 10, the connection between the connecting portion 61 and the limiting portion 62, as well as the limiting portion 62, will hinder the refrigerant from entering the limiting groove 50, which helps to disperse the flow path of the refrigerant and thus facilitates its discharge from the drive chamber 20. The internal air helps to shorten the time for the refrigerant to enter the drive chamber 20. On the other hand, when the valve device 100 is in the closed state, the refrigerant carrying foreign objects flows from the drive chamber 20 through the limiting groove 50 into the valve chamber 10. Since the drive chamber 20 only has one outlet, the limiting groove 50, the air inside the drive chamber 20 cannot be discharged smoothly. When the air inside the valve chamber 10 enters the drive chamber 20, it will impact the refrigerant, which helps to disperse the foreign objects and suspend them in the refrigerant, which is conducive to the discharge of foreign objects from the drive chamber 20.

[0047] Combination Figures 2 to 6 as well as Figure 10 As shown, the limiting member 6 also includes a connecting part 61, which is sleeved on the outside of the valve stem 4. The connecting part 61 is interference-fitted with the valve stem 4, and the connecting part 61 and the limiting part 62 are an integral structure. Specifically, the connecting part 61 is welded to the valve stem 4 after interference fit.

[0048] The connecting part 61 and the limiting part 62 are an integral structure. This arrangement helps to reduce the risk of the connection between the limiting part 62 and the first limiting wall 503 loosening after impact.

[0049] Combination Figures 2 to 6 as well as Figure 10 As shown, the connecting part 61 includes a sleeve part 610 and a cantilever 611. The sleeve part 610 is located radially outside the valve stem 4. The sleeve part 610 is fixed, limited, or integrally connected with the valve stem 4. One end of the cantilever 611 is integrally connected with the sleeve part 610, and the other end of the cantilever 611 is integrally connected with the limiting part 62. The minimum distance between the wall forming the first opening 501 and the axis of the valve stem 4 is greater than the maximum outer diameter of the sleeve part 610. Specifically, the sleeve part 610 has a through hole. The wall forming the through hole on the sleeve part 610 is interference-fitted with the valve stem 4. The sleeve part 610 is welded and fixed to the valve stem 4. The through hole on the sleeve part 610 is polygonal, and the outer wall of the sleeve part 610 is circular.

[0050] The minimum distance between the wall forming the first opening 501 and the axis of the valve stem 4 is greater than the maximum outer diameter of the sleeve 610. With this configuration, foreign objects are discharged into the valve cavity 10 along with the cold medium flowing through the limiting groove 50, which helps to reduce the discharge resistance of foreign objects and also helps to reduce the risk of foreign objects getting stuck between the sleeve 610 and the second end wall 53.

[0051] Combination Figures 2 to 6 as well as Figure 10 As shown, along the moving direction of the limiting part 62, the width of the cantilever 611 is smaller than the width of the second opening 502. Specifically, in this embodiment, the cantilever 611 is rod-shaped, while in other embodiments, the cantilever 611 may also be plate-shaped.

[0052] The width of the cantilever 611 is smaller than the width of the second opening 502. This design serves two purposes: firstly, when the refrigerant enters the limiting groove 50 from the valve cavity 10, the shape of the cantilever 611 helps to disperse the flow path of the refrigerant, thereby facilitating the discharge of air from the drive cavity 20 and shortening the time it takes for the refrigerant to enter the drive cavity 20; secondly, when the refrigerant carrying foreign objects flows from the drive cavity 20 through the limiting groove 50 into the valve cavity 10, the air inside the drive cavity 20 is not discharged smoothly because the limiting groove 50 is the only outlet. When the air from the valve cavity 10 enters the drive cavity 20, it impacts the refrigerant, which helps to disperse the foreign objects and suspend them in the refrigerant, thus facilitating the discharge of foreign objects from the drive cavity 20.

[0053] Combination Figure 2 as well as Figure 3 As shown, along the axial direction of the valve stem 4, the minimum axial distance between the cantilever 611 and the base 5 is greater than the minimum axial distance between the sleeve 610 and the base 5. With this configuration, when foreign objects impact the cantilever 611 with the cold medium, it helps to reduce the risk of foreign objects being impacted between the sleeve 610 and the second end wall 53 and thus getting stuck between the sleeve 610 and the second end wall 53.

[0054] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features of the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this description.

[0055] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the present invention.

Claims

1. A valve device, characterized by The valve device (100) includes a valve stem (4), a base (5), and a limiting member (6). The base (5) has a limiting groove (50) and a valve stem hole (51). The limiting groove (50) is separated from the valve stem hole (51). The valve stem (4) is rotatably connected to the side wall forming the valve stem hole (51). The limiting member (6) is fixed to the valve stem (4), limited to a specific position, or is an integral structure. The limiting member (6) includes a limiting part (62). At least part of the wall forming the limiting groove (50) can limit the movement range of the limiting part (62). The base (5) includes a first end wall (52) and a second end wall (53). Along the axial direction of the base (5), the first end wall (52) and the second end wall (53) are located on opposite sides of the base (5). The limiting groove (50) has a first opening (501) and a second opening (502). The first opening (501) is located on the first end wall (52), and the second opening (502) is located on the second end wall (53). The valve device (100) has a valve chamber (10) and a drive chamber (20). Along the axial direction of the valve stem (4), the valve chamber (10) and the drive chamber (20) are located on opposite sides of the base (5). The first port (501) is connected to the drive chamber (20), and the second port (502) is connected to the valve chamber (10).

2. The valve device according to claim 1, characterized in that Along the axial direction of the valve stem (4), at least a portion of the projection of the first port (501) coincides with at least a portion of the projection of the second port (502).

3. Valve device according to claim 1 or 2, characterized in that The limiting groove (50) is located radially outside the valve stem hole (51). The limiting groove (50) includes a limiting channel (54). The limiting channel (54) includes a second opening (502). The wall forming the limiting channel (54) includes a first limiting wall (503) and a second limiting wall (504). At least a portion of the limiting part (62) is capable of moving inside the limiting channel (54). Along the moving direction of the limiting part (62), the first limiting wall (503) is located on one end sidewall of the limiting channel (54), and the second limiting wall (504) is located on the other end sidewall of the limiting channel (54). The limiting part (62) is capable of abutting against the first limiting wall (503) and the limiting part (62) is capable of abutting against the second limiting wall (504).

4. The valve device of claim 3, wherein The limiting channel (54) includes a connecting channel (505), which includes the space between the sidewall forming the limiting channel (54) and the limiting part (62), and the proportion of the connecting channel (505) in the limiting channel (54) is between 50% and 98%.

5. Valve device according to claim 3 or 4, characterized in that The wall forming the limiting channel (54) can guide the movement of the limiting part (62); Along the radial direction of the valve stem (4), the gap between the limiting portion (62) and any side wall forming the limiting channel (54) is less than 5% of the height of the wall forming the limiting channel (54).

6. Valve device according to any of claims 3-5, characterized in that The limiting groove (50) also includes a guide channel (55), which is connected to the limiting channel (54). The guide channel (55) includes a first opening (501). The area of ​​the guide channel (55) is larger than the area of ​​the limiting channel (54). The area of ​​the guide channel (55) decreases from the direction from the guide channel (55) to the limiting channel (54).

7. The valve device of claim 6, wherein The limiting member (6) further includes a connecting part (61), which is located in the valve cavity (10). The connecting part (61) includes a sleeve part (610) and a cantilever (611). The sleeve part (610) is located on the radial outer side of the valve stem (4). The sleeve part (610) is fixed, limited, or integrally connected with the valve stem (4). One end of the cantilever (611) is integrally connected with the sleeve part (610), and the other end of the cantilever (611) is integrally connected with the limiting part (62). Along the moving direction of the limiting part (62), the width of the cantilever (611) is smaller than the width of the second opening (502).

8. The valve device of claim 7, wherein Along the axial direction of the valve stem (4), the minimum axial distance between the cantilever (611) and the base (5) is greater than the minimum axial distance between the sleeve (610) and the base (5).

9. Valve device according to any of claims 1-8, characterized in that The valve stem (4) includes a large-diameter portion (41) and a small-diameter portion (42). The small-diameter portion (42) is rotatably connected to the side wall forming the valve stem hole (51). There is a step portion (43) between the large-diameter portion (41) and the small-diameter portion (42). The step portion (43) is located in the drive cavity (20). The minimum outer diameter of the step portion (43) is greater than the inner diameter of the valve stem hole (51). The maximum distance between the wall forming the first opening (501) and the axis of the valve stem (4) is greater than the minimum outer diameter of the step portion (43).

10. The valve device according to claim 9, characterized in that, Along the axial direction of the valve stem (4), the base (5) is located between the connecting portion (61) and the stepped portion (43); The stepped portion (43) has an axial distance from the first end wall (52), and / or the connecting portion (61) has an axial distance from the second end wall (53).

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