A valve device

Abstract

A valve device includes a valve seat assembly and a valve core. The valve seat assembly has a valve cavity, and the valve core is rotatable within the valve cavity. The valve seat assembly also has a first opening, a second opening, and a third opening, with the first and second openings spaced apart around the rotation direction of the valve core. The valve core has a valve core channel, and the third opening communicates with the valve core channel. The valve core channel includes a valve core opening, and both the first and second openings communicate with the same valve core opening. The valve device includes a flow-diverting state, in which the first and second openings communicate with the same valve core opening. This configuration helps to reduce flow resistance during the operation of the valve device.

Description

Technical Field

[0001] This application relates to the field of fluid control technology, specifically to a vehicle valve device. Background Technology

[0002] The valve device includes a three-way valve. In related technologies, the three-way valve includes a valve core and a valve seat assembly having a valve cavity, a first opening, a second opening, and a third opening. The valve core can rotate within the valve cavity and has a valve core channel with at least two openings. The first opening, the second opening, and the third opening can all communicate with the valve core channel. The first opening and the second opening are each connected to the valve core channel through a valve core opening. During the rotation of the valve core, the solid portion between the two openings of the valve core will block the fluid, resulting in increased flow resistance. Therefore, it is necessary to design a valve device that can help reduce the flow resistance during the operation of the valve device. Utility Model Content

[0003] The purpose of this application is to provide a valve device that helps reduce flow resistance during valve operation.

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

[0005] A valve device includes a valve seat assembly and a valve core. The valve seat assembly has a valve cavity, and the valve core is rotatable within the valve cavity. The valve seat assembly also has a first opening, a second opening, and a third opening, with the first opening and the second opening spaced apart about the rotation direction of the valve core. The valve core has a valve core channel, and the third opening communicates with the valve core channel. The valve core channel includes a valve core opening, and both the first opening and the second opening are communicating with the same valve core opening. The valve device includes a flow-diverting state, in which both the first opening and the second opening are communicating with the same valve core opening.

[0006] In one technical solution provided in this application, the third opening is connected to the valve core channel, the valve core channel includes a valve core opening, and both the first opening and the second opening can be connected to the same valve core opening; the valve device includes a flow splitting state, in which the first opening and the second opening are both connected to the same valve core opening; this setting reduces the obstruction effect of the valve core body on the fluid in the flow splitting state, which is beneficial to reducing the flow resistance during the operation of the valve device. Attached Figure Description

[0007] Figure 1 This is a three-dimensional structural schematic diagram of the first embodiment 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 1 A schematic diagram of the cross-sectional structure along the BB direction;

[0010] Figure 4 This is an enlarged axial view of the valve core (first embodiment of the valve device);

[0011] Figure 5 This is a three-dimensional structural schematic diagram of the second embodiment of the valve device provided in this application;

[0012] Figure 6 yes Figure 5 A schematic diagram of the cross-sectional structure in the CC direction;

[0013] Figure 7 yes Figure 5 A schematic diagram of the cross-sectional structure in the CC direction;

[0014] Figure 8 This is an enlarged axial view of the valve core (second embodiment of the valve device);

[0015] Figure 9 This is a schematic diagram of the flow regulation curves for the first and second openings (applicable to the first and second embodiments of the valve device).

[0016] Figure label:

[0017] 1. Valve assembly; 2. Valve seat assembly; 3. Valve core; 4. Drive assembly;

[0018] 20. Valve cavity;

[0019] 30. Valve core passage; 31. Expansion groove;

[0020] 201, First valve port wall; 202, Second valve port wall; 203, Third valve port wall; 211, First channel; 212, Second channel; 213, Third channel; 221, First sealing assembly; 222, Second sealing assembly;

[0021] 301. Valve core bore; 302. Valve core flow channel;

[0022] 2110, First opening; 2120, Second opening; 2130, Third opening;

[0023] 3020, Valve core opening. Detailed Implementation

[0024] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0025] The axial direction of valve device 1 is defined to be consistent with the axial direction of valve core 3 and parallel to the rotation axis of valve core 3. The axial direction mentioned below refers to the axial direction of valve core 3, and the circumferential direction refers to the circumferential direction of valve core 3. Furthermore, the terms "approximately perpendicular" and "approximately parallel" in the following text refer to deviations from the original angle by ±10 degrees. That is, "approximately perpendicular" means that the acute angle between the two intersecting lines is between 80 and 90 degrees; "approximately parallel" means that the acute angle between the two intersecting lines is between 0 and 10 degrees.

[0026] The projection of the wall forming the first opening 2110 roughly coincides with the periphery of the valve core opening 3020, meaning that the deviation between the two is within 5% of the radius of the valve core 3; the projection of the wall forming the second opening 2120 roughly coincides with the periphery of the valve core opening 3020, meaning that the deviation between the two is within 5% of the radius of the valve core 3.

[0027] Combination Figures 1 to 9 As shown, an embodiment of the valve device 1 is illustrated. In this embodiment, the valve device 1 includes a valve seat assembly 2, a valve core 3, and a drive assembly 4. The valve seat assembly 2 has a valve cavity 20, and the drive assembly 4 can drive the valve core 3 to rotate within the valve cavity 20. The valve seat assembly 2 also has a first opening 2110, a second opening 2120, and a third opening 2130, with the first opening 2110 and the second opening 2120 spaced apart around the rotation direction of the valve core 3. The valve core 3 has a valve core channel 30, and the third opening 2130 can communicate with the valve core channel 30. The valve core channel 30 includes a valve core opening 3020, with the first opening 2110 and the second opening 2120 communicating with each other. The valve device 1 includes a flow-diverting state, in which the first opening 2110 and the second opening 2120 communicate with each other. Specifically, the valve... The seat assembly 2 has a first channel 211, a second channel 212, and a third channel 213. The first channel 211 includes a first opening 2110, the second channel 212 includes a second opening 2120, and the third channel 213 includes a third opening 2130. During the operation of the valve device 1, the third channel 213 is used to introduce fluid, and the first channel 211 and the second channel 212 are used to discharge fluid. In this embodiment, the fluid introduced into the valve device 1 is a refrigerant. The valve core 3 is spherical. When the valve device 1 is in a flow-dividing state, the rotation of the valve core 3 can independently adjust the opening and closing of the first opening 2110, thereby achieving independent flow control of the first opening 2110. The rotation of the valve core 3 can also independently adjust the opening and closing of the second opening 2120, thereby achieving independent flow control of the second opening 2120. In this process, the flow distribution ratio of the first opening 2110 and the second opening 2120 is adjusted to achieve a predetermined flow curve.

[0028] In the diversion state, the first opening 2110 is connected to the valve core opening 3020, and the second opening 2120 is connected to the valve core opening 3020. With this configuration, on the one hand, both the first opening 2110 and the second opening 2120 are connected to the valve core channel 30 through the valve core opening 3020. Along the rotation direction of the valve core 3, the obstruction of the valve core 3 physical part between the first opening 2110 and the second opening 2120 to the fluid is reduced, which is beneficial to reducing the flow resistance during the operation of the valve device.

[0029] Combination Figure 3 , Figure 6 as well as Figure 8 As shown, the valve device 1 includes a fully open state. In the fully open state, along the opening direction of the first opening 2110, the projection of a portion of the wall forming the first opening 2110 approximately coincides with the periphery of the valve core opening 3020, or the projection of a portion of the wall forming the first opening 2110 is located inside the valve core opening 3020; along the opening direction of the second opening 2120, the projection of a portion of the wall forming the second opening 2120 approximately coincides with the periphery of the valve core opening 3020, or the projection of a portion of the wall forming the valve core opening 3020 is located inside the valve core opening 3020; specifically, in the fully open state, water flows through the first opening 2110. The fluid flowing through the valve core channel 30 is not obstructed by the wall forming the valve cavity 20, and the fluid flowing through the second opening 2120 and the valve core channel 30 is not obstructed by the wall forming the valve cavity 20. With this arrangement, on the one hand, when fully open, the obstruction effect of the wall forming the valve cavity 20 on the fluid is small, which helps to reduce the flow resistance of the valve device 1 in the fully open state; on the other hand, when the valve device 1 is in the flow-dividing state, the valve core 3 rotates, the first opening 2110 remains fully open, and the flow rate of the second opening 2120 is coarsely adjusted, which helps to control the distribution ratio of the first opening 2110 and the second opening 2120 to achieve a predetermined flow rate curve.

[0030] Combination Figures 1 to 4 as well as Figure 9As shown, in the first embodiment of the valve device 1, the opening direction of the third opening 2130 is parallel to the rotation axis of the valve core 3. The valve core channel 30 includes a valve core hole 301 and a valve core flow channel 302. The valve core hole 301 communicates with the valve core flow channel 302, which includes a valve core opening 3020. The extending direction of the valve core hole 301 is parallel to the rotation axis of the valve core 3, and the valve core hole 301 communicates with the third opening 2130. Specifically, in this embodiment, the valve core hole 301 is coaxially arranged with the rotation axis of the valve core 3. During the rotation of the valve core 3, the communication area between the third opening 2130 and the valve core hole 301 remains unchanged. In other embodiments, the communication area between the third opening 2130 and the valve core opening 3020 can be increased or decreased as the valve core 3 rotates by changing the interval between the rotation axis of the valve core hole 301 and the valve core 3. In addition, the shape of the valve core hole 301 can be changed, such as by changing the shape of the valve core hole 301, which can be elliptical, polygonal, etc., to obtain different communication areas between the third opening 2130 and the valve core opening 3020.

[0031] The extension direction of the valve core hole 301 is parallel to the rotation axis of the valve core 3, and the valve core hole 301 is connected to the third opening 2130. With this configuration, during the operation of the valve device 1, the third opening 2130 serves as a fluid inlet to allow fluid to pass through. During the rotation of the valve core 3, the third opening 2130 is always connected to the valve core hole 301, which is beneficial to controlling the communication area between the third opening 2130 and the valve core channel 30, thereby controlling the flow rate of fluid entering the valve core channel 30 through the third opening 2130.

[0032] Furthermore, in combination Figures 1 to 4 As shown, in the first embodiment of the valve device 1, along the opening direction of the third opening 2130, the projection of the wall forming the valve core hole 301 roughly coincides with the periphery of the third opening 2130 (it is worth noting that: roughly coincides here means that within the machining and assembly tolerance range of the valve core hole 301 and the third opening 2130, the projection of the wall forming the valve core hole 301 roughly coincides with the periphery of the third opening 2130 as much as possible); specifically, the inner diameter of the valve core hole 301 is equal to the inner diameter of the third opening 2130, and the outer wall of the valve core 3 will not block the fluid entering the valve core hole 301 from the third opening 2130, which is beneficial to reduce the flow resistance of the fluid entering the valve core hole 301 from the third opening 2130.

[0033] Combination Figures 5 to 9As shown, in the second embodiment of valve device 1, the opening direction of the third opening 2130 is approximately perpendicular to the rotation axis of the valve core 3. Along the rotation direction of the valve core 3, the third opening 2130 is located between the first opening 2110 and the second opening 2120. When valve device 1 is in a flow-diverting state, the third opening 2130 is connected to the valve core opening 3020. Specifically, the first opening 2110, the second opening 2120, and the third opening 2130 are spaced apart around the rotation direction of the valve core 3. In this embodiment, in the flow-diverting state, the communication area between the third opening 2130 and the valve core opening 3020 remains unchanged. In other embodiments, the shape of the valve core opening 3020 can be changed, such as by increasing or decreasing the axial height of the valve core opening 3020 around the rotation axis of the valve core 3. The communication area between the third opening 2130 and the valve core opening 3020 can increase or decrease with the rotation of the valve core 3 to adapt to the operation of valve device 1 under special working conditions.

[0034] When valve device 1 is in the flow splitting state, the third opening 2130 is connected to the valve core opening 3020. With this configuration, when valve device 1 is in the flow splitting state, it can control the flow rate of fluid flowing from the third opening 2130 into the valve core opening 3020, which is beneficial to proportionally adjust the flow rate distributed by the first opening 2110 and the second opening 2120 to achieve a predetermined flow rate curve.

[0035] Furthermore, in combination Figures 5 to 9 As shown, in the second embodiment of the valve device 1, in the flow-dividing state, along the opening direction of the third opening 2130, a portion of the projection of the wall forming the third opening 2130 is located on the wall forming the valve core channel 30, and another portion of the projection of the wall forming the third opening 2130 is approximately tangent to the periphery of the valve core opening 3020 (it is worth noting that: approximately tangent here means that within the machining and assembly tolerance range of the valve core opening 3020 and the third opening 2130, the two ends of the projection of the wall forming the third opening 2130 are as tangent to the periphery of the valve core opening 3020 as possible). With this configuration, when the valve device 1 is in the flow-dividing state, the flow rate of the fluid flowing from the third opening 2130 into the valve core opening 3020 remains constant, which is beneficial for controlling the flow rate obtained by the distribution of the first opening 2110 and the second opening 2120 when proportionally adjusting the flow rate distributed to the first opening 2110 and the second opening 2120, thereby achieving a predetermined flow rate curve.

[0036] Combination Figures 2 to 4 as well as Figures 6 to 8As shown, in the first or second embodiment of the valve device 1, the opening direction of the first opening 2110 is opposite to the opening direction of the second opening 2120, and the opening direction of the first opening 2110 is parallel or coincident with the opening direction of the second opening 2120. In the fully open state, the projection of the wall forming the valve core channel 30 along the opening direction of the first opening 2110 is a U-shape or V-shape with an opening on one side; a portion of the wall forming the first opening 2110 is approximately coincident with the U-shape or V-shape projection of the valve core channel 30, and another portion of the first opening 2110 is located in the U-shape or V-shape of the valve core channel 30. The wall forming the second opening 2120 is approximately coincident with the U-shaped or V-shaped projection of the valve core channel 30, while the other part of the second opening 2120 is located inside the U-shaped or V-shaped projection of the valve core channel 30. Specifically, in this embodiment, when fully open, along the opening direction of the first opening 2110, the projection of the wall forming the valve core channel 30 is a U-shape with an opening on one side. The first opening 2110 is located inside the U-shaped projection of the valve core channel 30, and the second opening 2120 is located inside the U-shaped projection of the valve core channel 30. The valve core channel 30 is formed by casting the valve core 3 and then machining it.

[0037] The opening direction of the first opening 2110 is parallel to the opening direction of the second opening 2120. This arrangement facilitates the processing of the valve seat assembly 2, and the first opening 2110 and the second opening 2120 can be processed simultaneously in one machining operation, which helps to reduce the processing steps of the valve seat assembly 2.

[0038] The first opening 2110 is located inside the U-shaped or V-shaped projection of the valve core channel 30, and the second opening 2120 is located inside the U-shaped or V-shaped projection of the valve core channel 30. This arrangement is beneficial to ensure that, given a fixed volume of the valve device 1, the first opening 2110 and the valve core channel 30 have the largest possible communication area, and the second opening 2120 and the valve core channel 30 have the largest possible communication area, when the valve device 1 is in the fully open state.

[0039] Combination Figure 2 , Figure 3 , 6 and Figure 7As shown, in the first or second embodiment of the valve device 1, the third opening 2130 is connected to the valve cavity 20, and the valve cavity 20 is connected to the valve core channel 30. The wall forming the valve cavity 20 includes the third valve port wall 203, and the third opening 2130 is located in the third valve port wall 203. The outer wall of the valve core 3 is spaced apart from the third valve port wall 203. Specifically, the third opening 2130 is connected to the valve cavity 20. During the rotation of the valve core 3, the communication area between the third opening 2130 and the valve cavity 20 remains unchanged, and the communication area between the valve cavity 20 and the valve core opening 3020 remains constant. With this configuration, no matter what angle the valve core 3 rotates to, the fluid flow rate in the valve core channel 30 remains constant, which is beneficial for controlling the first opening 2110 or the second opening 2120 to distribute the specified flow rate when the valve device 1 is in a diversion state.

[0040] Combination Figures 2 to 4 as well as Figures 6 to 8 As shown, in the first or second embodiment of the valve device 1, the valve core 3 also has an expansion groove 31. Part of the opening of the expansion groove 31 is located on the outer peripheral wall of the valve core 3. One end of the expansion groove 31 is connected to the valve core channel 30. The extension direction of the expansion groove 31 is consistent with the rotation direction of the valve core 3. Specifically, in this embodiment, there is one expansion groove 31. When the valve device 1 is in the fully open state, one end of the expansion groove 31 is located on the inner wall of the circumferential side of the valve core channel 30. When the valve device 1 is in the diversion state, the expansion groove 31 is close to the first opening 2110. The first opening 2110 can be connected to the valve core channel 30 through the expansion groove 31. In other embodiments, there may be two expansion grooves 31. The two expansion grooves 31 are respectively located on the inner wall of the circumferential side of the valve core channel 30.

[0041] The expansion groove 31 is located on the outer peripheral wall of the valve core 3, and one end of the expansion groove 31 is connected to the valve core channel 30. With this configuration, when the valve core 3 rotates and the first opening 2110 is connected to the valve core channel 30 through the expansion groove 31, a small area of ​​connection between the first opening 2110 and the valve core channel 30 can be achieved, which is beneficial for controlling the small flow rate connection between the first opening 2110 and the valve core channel 30.

[0042] Furthermore, in combination Figure 4 and Figure 8 As shown, in the first or second embodiment of the valve device 1, along the rotation direction of the valve core 3, from the valve core opening 3020 to the direction away from the valve core opening 3020, the depth difference between the bottom wall of the expansion groove 31 and the outer peripheral wall of the valve core 3 decreases; specifically, the bottom wall of the expansion groove 31 away from the valve core opening 3020 is connected to the outer peripheral wall of the valve core 3.

[0043] With this configuration, when the first opening 2110 is connected to the valve core channel 30 through the expansion groove 31, the rotation of the valve core 3 can finely adjust the connection area between the first opening 2110 and the valve core channel 30, which is beneficial to improving the control accuracy of the small-range connection area between the first opening 2110 and the valve core channel 30, thereby realizing the small flow rate regulation of the valve device 1.

[0044] Combination Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, in the first or second embodiment of the valve device 1, the valve seat assembly 2 includes a first sealing assembly 221 and a second sealing assembly 222. The wall forming the valve cavity 20 includes a first valve port wall 201 and a second valve port wall 202. A first opening 2110 is located in the first valve port wall 201, and a second opening 2120 is located in the second valve port wall 202. Along the radial direction of the valve core 3, the first sealing assembly 221 is sealed between the outer peripheral wall of the valve core 3 and the first valve port wall 201. The second sealing assembly... The sealing component 222 is disposed between the outer peripheral wall of the valve core 3 and the second valve port wall 202; specifically, the first valve port wall 201 surrounds the first opening 2110, the second valve port wall 202 surrounds the second opening 2120, the first sealing component 221 is annular, the second sealing component 222 is annular, along the radial direction of the valve core 3, the first sealing component 221 is pressed between the outer peripheral wall of the valve core 3 and the first valve port wall 201, and the second sealing component 222 is pressed between the outer peripheral wall of the valve core 3 and the second valve port wall 202.

[0045] Along the radial direction of the valve core 3, the first sealing assembly 221 is sealed between the outer peripheral wall of the valve core 3 and the first valve port wall 201, and the second sealing assembly 222 is sealed between the outer peripheral wall of the valve core 3 and the second valve port wall 202. With this arrangement, during the rotation of the valve core 3, the outer peripheral wall of the valve core 3 maintains contact and sealing with the first sealing assembly 221 and the second sealing assembly 222, which is beneficial for the valve core 3 to close the first opening 2110 or the second opening 2120, or to control the valve core channel 30 to communicate with the first opening 2110 or to control the valve core channel 30 to communicate with the second opening 2120.

[0046] The technical features of the above-described embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features of the above-described 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.

[0047] It should be noted that the above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. Although the present utility model 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 utility model. All technical solutions and improvements that do not depart from the spirit and scope of the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A valve device, characterized in that: It includes a valve seat assembly (2) and a valve core (3), the valve seat assembly (2) having a valve cavity (20) and the valve core (3) being rotatable within the valve cavity (20); The valve seat assembly (2) also has a first opening (2110), a second opening (2120) and a third opening (2130), wherein the first opening (2110) and the second opening (2120) are spaced apart around the rotation direction of the valve core (3); The valve core (3) has a valve core channel (30), and the third opening (2130) is connected to the valve core channel (30). The valve core channel (30) includes a valve core opening (3020), and the first opening (2110) and the second opening (2120) are both connected to the same valve core opening (3020). The valve device (1) includes a flow-diverting state, in which the first opening (2110) and the second opening (2120) are both connected to the same valve core opening (3020).

2. The valve device according to claim 1, characterized in that, The opening direction of the third opening (2130) is parallel to the rotation axis of the valve core (3). The valve core channel (30) includes a valve core hole (301) and a valve core flow channel (302). The valve core hole (301) is connected to the valve core flow channel (302). The valve core flow channel (302) includes the valve core opening (3020). The extension direction of the valve core hole (301) is parallel to the rotation axis of the valve core (3). The valve core hole (301) is connected to the third opening (2130).

3. The valve device according to claim 2, characterized in that, Along the opening direction of the third opening (2130), the projection of the wall forming the valve core hole (301) roughly coincides with the periphery of the third opening (2130).

4. The valve device according to claim 1, characterized in that, The opening direction of the third opening (2130) is approximately perpendicular to the rotation axis of the valve core (3). Along the rotation direction of the valve core (3), the third opening (2130) is located between the first opening (2110) and the second opening (2120). In the diversion state, the third opening (2130) is connected to the valve core opening (3020).

5. The valve device according to claim 4, characterized in that, In the diversion state, along the opening direction of the third opening (2130), a portion of the projection of the wall forming the third opening (2130) is located on the wall forming the valve core channel (30), and another portion of the projection of the wall forming the third opening (2130) is approximately tangent to the periphery of the valve core opening (3020).

6. The valve device according to any one of claims 1-5, characterized in that, The diversion state includes a fully open state. In the fully open state, along the opening direction of the first opening (2110), the projection of the wall that partially forms the first opening (2110) roughly coincides with the periphery of the valve core opening (3020), or the projection of the wall that forms the first opening (2110) is located inside the valve core opening (3020); along the opening direction of the second opening (2120), the projection of the wall that partially forms the second opening (2120) roughly coincides with the periphery of the valve core opening (3020), or the projection of the wall that forms the second opening (2120) is located inside the valve core opening (3020).

7. The valve device according to claim 6, characterized in that, The opening direction of the first opening (2110) is opposite to the opening direction of the second opening (2120), and the opening direction of the first opening (2110) is parallel or coincident with the opening direction of the second opening (2120). In the fully open state, the projection of the wall forming the valve core opening (3020) along the opening direction of the first opening (2110) is a U-shape or V-shape with an opening on one side. A portion of the wall forming the first opening (2110) roughly coincides with the U-shaped or V-shaped projection of the valve core channel (30), while another portion of the wall forming the first opening (2110) is located inside the U-shaped or V-shaped projection of the valve core channel (30). A portion of the wall forming the second opening (2120) roughly coincides with the U-shaped or V-shaped projection of the valve core channel (30), while another portion of the wall forming the second opening (2120) is located inside the U-shaped or V-shaped projection of the valve core channel (30).

8. The valve device according to any one of claims 1-7, characterized in that, The third opening (2130) is connected to the valve cavity (20), the valve cavity (20) is connected to the valve core channel (30), the wall forming the valve cavity (20) includes the third valve port wall (203), the third opening (2130) is located on the third valve port wall (203), and the outer wall of the valve core (3) is spaced apart from the third valve port wall (203).

9. The valve device according to any one of claims 1-8, characterized in that, The valve core (3) also has an expansion groove (31), a portion of the opening of the expansion groove (31) is located on the outer peripheral wall of the valve core (3), one end of the expansion groove (31) is connected to the valve core channel (30), and the extension direction of the expansion groove (31) is consistent with the rotation direction of the valve core (3).

10. The valve device according to claim 9, characterized in that, Along the rotation direction of the valve core (3), from the valve core opening (3020) to a direction away from the valve core opening (3020), the depth difference between the bottom wall of the expansion groove (31) and the outer peripheral wall of the valve core (3) decreases.

11. The valve device according to any one of claims 1-10, characterized in that, The valve seat assembly (2) includes a first sealing assembly (221) and a second sealing assembly (222). The wall forming the valve cavity (20) includes a first valve port wall (201) and a second valve port wall (202). The first opening (2110) is located in the first valve port wall (201), and the second opening (2120) is located in the second valve port wall (202). Along the radial direction of the valve core (3), the first sealing assembly (221) is sealed between the outer peripheral wall of the valve core (3) and the first valve port wall (201), and the second sealing assembly (222) is sealed between the outer peripheral wall of the valve core (3) and the second valve port wall (202).

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