Valve device

Abstract

The valve device comprises a driving assembly, a valve seat assembly, a diaphragm and a valve element assembly, the valve seat assembly is fixedly connected with the driving assembly, the valve seat assembly is provided with a valve port, the driving assembly is in transmission connection with the valve element assembly, the valve element assembly can axially move to open or close the valve port, and the diaphragm is arranged in the valve element assembly in the axial direction of the valve device. At least part of the diaphragm is arranged between the driving assembly and the valve seat assembly; the valve device is provided with a liquid inlet cavity and a balance cavity, the valve element assembly is provided with a balance channel, the balance channel is communicated with the balance cavity and the liquid inlet cavity, the wall part limiting the mounting hole and the valve element assembly are arranged in a sealed mode, and the diaphragm limits part of the wall part of the balance cavity. Part of the working fluid can enter the balance cavity through the balance channel, and the driving force of the valve device can be reduced.

Description

Technical Field

[0001] This application relates to the field of thermal management technology, and more particularly to a valve device. Background Technology

[0002] Typically, the valve core of a solenoid valve moves under the drive of a driving component to control the fluid flow path. However, current solenoid valves require a large driving force to move the valve core, which is not conducive to saving resources. Utility Model Content

[0003] In view of this, this application provides a valve device for reducing the driving force of the valve device.

[0004] This application provides a valve device comprising a drive assembly, a valve seat assembly, a diaphragm, and a valve core assembly. The valve seat assembly and the drive assembly are fixedly connected. The valve seat assembly has a valve port. The drive assembly is pulsatorically connected to the valve core assembly. The valve core assembly is axially movable to open or close the valve port. Along the axial direction of the valve device, at least a portion of the diaphragm is disposed between the drive assembly and the valve seat assembly. The valve device has an inlet chamber and a balance chamber. Along the axial direction of the valve device, the valve port is located between the inlet chamber and the balance chamber. The valve core assembly has a balance channel communicating between the balance chamber and the inlet chamber. The diaphragm has a mounting hole, defining a wall portion of the mounting hole that is sealed to the valve core assembly. The diaphragm also defines a portion of the wall portion of the balance chamber.

[0005] The valve device provided in this application, by sealing a diaphragm between the drive assembly and the valve seat assembly, and the diaphragm defining a portion of the wall of the balance chamber, and the balance channel of the valve core assembly connecting the balance chamber and the inlet chamber, allows a portion of the working fluid to enter the balance chamber through the inlet chamber and the balance channel. The force exerted by the fluid in the balance chamber on the valve core assembly is at least partially offset by the force exerted by the working fluid in the inlet chamber on the valve core assembly. Furthermore, the diaphragm defining a portion of the wall of the balance chamber helps to reduce the driving force of the valve device on the valve core assembly when the valve core assembly moves axially to open the valve port. Attached Figure Description

[0006] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0007] Figure 1 A schematic diagram of one embodiment of the valve device provided in this application;

[0008] Figure 2 for Figure 1 A cross-sectional view;

[0009] Figure 3 for Figure 2 A magnified view of part A in the diagram;

[0010] Figure 4 for Figure 1 An explosion diagram;

[0011] Figure 5 for Figure 1 A schematic diagram of the membrane structure;

[0012] Figure 6 for Figure 5 A cross-sectional schematic diagram;

[0013] Figure 7 A schematic diagram of another embodiment of the valve device provided in this application;

[0014] Figure 8 for Figure 7 A cross-sectional view;

[0015] Figure 9 for Figure 8 A magnified view of part I.

[0016] Explanation of reference numerals in the attached figures:

[0017] 1-Driver components;

[0018] 11-Pressure plate;

[0019] 12-Coil assembly;

[0020] 13-Moving iron core;

[0021] 14-Reception cavity;

[0022] 15-Stationary iron core;

[0023] 16-Elastic element;

[0024] 2-Valve seat assembly;

[0025] 21-Inlet chamber;

[0026] 22-Liquid outlet chamber;

[0027] 23-Limiting hole;

[0028] 24 - Valve body;

[0029] 25 - Valve seat;

[0030] 251 - Limiting part;

[0031] 252 - Avoidance section;

[0032] 26-Valve port;

[0033] 27 - Plastic coating layer;

[0034] 3-Piece;

[0035] 31 - Mounting hole;

[0036] 32-Balance chamber;

[0037] 33 - First sealing part;

[0038] 34 - Second sealing part;

[0039] 341-Connecting part;

[0040] 342 - Bending section;

[0041] 35-Sealing rib;

[0042] 4-Valve core assembly;

[0043] 41-Balance Channel;

[0044] 411 - First opening;

[0045] 412 - Second opening;

[0046] 42-Card slot;

[0047] 43 - Sealing part;

[0048] 5-Seals;

[0049] 6-Connector. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit its scope.

[0051] like Figures 1 to 4 As shown in the figure, this application provides a valve device for realizing fluid control. The valve device can be an electric valve, etc. The valve device includes a drive assembly 1, a valve seat assembly 2, a diaphragm 3, and a valve core assembly 4.

[0052] The valve seat assembly 2 and the drive assembly 1 are fixedly connected. In this embodiment, the valve seat assembly 2 and the drive assembly 1 are fixedly connected by a connector 6. Specifically, the outermost part of the drive assembly 1 has a housing 17, and the plastic-coated coil assembly 12 is located inside the housing 17. The valve body 24 and the housing 17 are connected by the connector 6, for example, by bolts. Of course, in other embodiments, the valve seat assembly 2 and the drive assembly 1 can be fixedly connected by welding, bonding, or other methods. The valve seat assembly 2 has a valve port 26. The drive assembly 1 is drivenly connected to the valve core assembly 4. The valve core assembly 4 can move axially to open or close the valve port 26. The valve port 26 is the inlet for fluid to enter the valve device. Controlling the opening and closing of the valve port 26 can control the flow of fluid.

[0053] Along the axial direction of the valve assembly, at least a portion of the diaphragm 3 is sealed between the drive assembly 1 and the valve seat assembly 2. The diaphragm 3 is elastic and can be made of rubber or plastic, etc. The portion of the diaphragm 3 located between the drive assembly 1 and the valve seat assembly 2 is used to improve the sealing performance of the drive assembly 1 and the valve seat assembly 2.

[0054] The valve device has an inlet chamber 21 and a balancing chamber 32. Along the axial direction of the valve device, the valve port 26 is located between the end of the inlet chamber 21 and the balancing chamber 32, allowing fluid to enter the inlet chamber 21. The balancing chamber 32 is located on the side of the diaphragm 3 away from the inlet chamber 21 and is formed by the diaphragm 3 and the drive assembly 1. The valve device includes an outlet chamber 22, which communicates with the valve seat assembly 2, allowing fluid to exit the valve device through the outlet chamber 22. The end of the inlet chamber 21 refers to the end of the inlet chamber 21 closest to the valve port 26.

[0055] Valve core assembly 4 has a balance channel 41, which connects the balance chamber 32 and the inlet chamber 21. Fluid can enter the balance chamber 32 from the inlet chamber 21 through the balance channel 41 (e.g., Figure 3 (The solid black arrow in the middle indicates the flow direction), reducing the pressure difference between the balance chamber 32 and the inlet chamber 21, so that the pressures of the two tend to be balanced. Since the inlet chamber 21 and the balance chamber 32 are located on opposite sides of the diaphragm 3, the fluid above the diaphragm exerts a downward pressure on the diaphragm, and the fluid at the end of the inlet chamber exerts an upward pressure on the valve port. Figure 3 (The hollow arrow indicates the direction of pressure), so the fluid can enter the balance chamber 32 from the inlet chamber 21 through the balance channel 41, which can balance the pressure difference on both sides of the diaphragm 3, thereby reducing the resistance when the valve core assembly 4 moves, and making it easier for the valve core assembly 4 to open or close the valve port 26.

[0056] Specifically, when the valve core assembly 4 moves axially along the valve device, it experiences axial resistance due to the presence of fluid. For example, when the valve core assembly 4 opens the valve port 26, if there is no fluid inside the valve seat 25, only the end of the valve core assembly 4 furthest from the valve seat 25 will be subjected to fluid pressure. A significant pressure difference exists between the two sides of the valve core assembly 4, and the valve core assembly 4 needs to overcome this pressure difference to open the valve port 26. In the solution provided in this application embodiment, by setting a balance chamber 32 and connecting the balance chamber 32 and the inlet chamber 21 with a balance channel 41 to balance the pressure of both, and by defining a portion of the wall of the balance chamber 32 with the diaphragm 3, the pressure difference between the two sides of the valve core assembly 4 along the valve device is reduced. This facilitates the movement of the valve core assembly 4, reduces the driving force required by the drive assembly 1 to drive the valve core assembly 4, and saves energy.

[0057] Please combine Figure 3 refer to Figure 5 and Figure 6 The diaphragm 3 has a mounting hole 31, which defines a sealing arrangement between the wall of the mounting hole 31 and the valve core assembly 4. The diaphragm 3 also defines a portion of the wall of the balance chamber 32. The inner wall of the mounting hole 31 can be connected to the valve core assembly 4. Because the diaphragm 3 is elastic and deformable, it will not affect the normal movement of the valve core assembly 4 when the valve core assembly 4 moves, and it can maintain good sealing performance.

[0058] By sealing the diaphragm 3 between the drive assembly 1 and the valve seat assembly 2, and defining a portion of the wall of the balance chamber 32, while the balance channel 41 of the valve core assembly 4 connects the balance chamber 32 and the inlet chamber 21, when the valve core assembly 4 moves axially to close or open the valve port 26, a portion of the working fluid can enter the balance chamber 32 through the inlet chamber 21 and the balance channel 41. The force exerted by the fluid in the balance chamber 32 on the valve core assembly 4 is completely or partially offset by the force exerted by the working fluid in the inlet chamber 21 on the valve core assembly 4. Furthermore, the diaphragm 3 defining a portion of the wall of the balance chamber 32 helps to reduce the driving force of the valve device. Further, at least a portion of the diaphragm 3 is sealed between the drive assembly 1 and the valve seat assembly 2, and the wall of the mounting hole 31 is sealed to the valve core assembly 4. Sealing is achieved by using the diaphragm 3, eliminating the need for additional sealing components, thereby simplifying the structure and reducing assembly steps.

[0059] Continue to refer to Figure 5 and Figure 6In one possible implementation, the diaphragm 3 includes a first sealing portion 33 and a second sealing portion 34, which are fixedly connected or integrated. The second sealing portion 34 is bent relative to the first sealing portion 33, wherein the first sealing portion 33 is located outside the second sealing portion 34 and is located between the drive assembly 1 and the valve seat assembly 2. A mounting hole 31 is formed in the second sealing portion 34, and the second sealing portion 34 is sealed to the side wall of the valve core assembly 4. The diaphragm 3 is capable of elastic deformation.

[0060] The diaphragm 3 has an overall annular structure, with the outer side of the diaphragm 3 being the first sealing part 33 and the inner side of the first sealing part 33 being the second sealing part 34. The mounting hole 31 is located in the second sealing part 34. The first sealing part 33 and the second sealing part 34 are integrally formed or connected to each other, which can reduce the number of assembly parts and reduce the assembly difficulty of the valve device. The first sealing part 33 is used to improve the sealing performance between the drive assembly 1 and the valve seat assembly 2, reducing the possibility of fluid leakage from the valve device to the outside. The first sealing part 33 has a flat shape, which is convenient to be placed between the valve seat assembly 2 and the drive assembly 1, and the first sealing part 33 has a large contact area with the valve seat assembly 2 and the drive assembly 1, which can enhance its sealing performance. The second sealing part 34 is used to achieve a sealing function along the axial direction of the valve core assembly 4, isolating the balance chamber 32 and the inlet chamber 21. The second sealing part 34 deforms when the valve core assembly 4 moves, so that the valve core assembly 4 can maintain a sealed connection with the second sealing part 34 even when moving.

[0061] like Figure 3 and Figure 6 As shown, in one possible embodiment, the second sealing part 34 has a snap-fit ​​part 341 that defines the wall of the mounting hole 31, and the side wall of the valve core assembly 4 has a snap-fit ​​groove 42, with the snap-fit ​​part 341 located in the snap-fit ​​groove 42.

[0062] The snap-fit ​​portion 341 is located on the side of the second sealing portion 34 near the valve core assembly 4. At least a portion of the snap-fit ​​portion 341 can protrude along the axial direction of the valve device, which facilitates the snap-fit ​​portion 341 to snap into the snap-fit ​​groove 42 and can improve the stability of the connection between the second sealing portion 34 and the valve core assembly 4 and the reliability of the seal.

[0063] like Figure 5 As shown, in one possible embodiment, the second sealing portion 34 includes a bent portion 342, which is located on the side of the second sealing portion 34 close to the valve core assembly 4, and the bent portion 342 is deformable when the valve core assembly 4 moves axially.

[0064] The bend 342 is the relatively curved part of the second sealing part 34. The bend 342 can achieve a large deformation, so that the second sealing part 34 deforms when the valve core assembly 4 moves, so that the second sealing part 34 and the valve core assembly 4 maintain a sealed connection and improve the stability of its seal.

[0065] The wall of the valve port 26 and the diaphragm 3 are arranged along the axial direction of the valve core assembly 4. The diaphragm 3 limits the bottom projection area of ​​the balance chamber 32 to be smaller than the projection area of ​​the valve port 26, so as to ensure that the valve core assembly 4 can completely block the valve port 26 and achieve the function of closing the valve port 26.

[0066] According to the pressure calculation formula, pressure = force / area, by limiting the relationship between the projected areas of the balance chamber 32 and the valve port 26 in the axial direction of the valve device, the pressure difference between the fluid pressure on the diaphragm 3 in the balance chamber 32 and the fluid pressure on the diaphragm 3 at the valve port 26 can be adjusted. Under the premise that the bottom projected area of ​​the balance chamber 32 along the axial projection of the valve core assembly 4 is smaller than the projected area of ​​the valve port 26, by increasing the bottom area of ​​the diaphragm 3, the resistance encountered by the valve core assembly 4 during movement can be reduced, so that the valve core assembly 4 can open the valve port 26 without overcoming a large resistance, which is beneficial to reducing the driving force of the drive device.

[0067] like Figure 6 As shown, in one possible implementation, the first sealing part 33 has a sealing rib 35 on the side away from the second sealing part 34. The thickness of the sealing rib 35 is greater than the thickness of the first sealing part 33, and at least part of the sealing rib 35 is located between the drive assembly 1 and the valve seat assembly 2.

[0068] The first sealing part 33 is located between the drive assembly 1 and the valve seat assembly 2. The edge of the first sealing part 33 has a sealing rib 35, which can be arranged circumferentially along the first sealing part 33. When compressed by the drive assembly 1 and the valve seat assembly 2, the sealing rib 35, due to its large thickness, undergoes a large deformation, generating a greater contact force with the drive assembly 1 and the valve seat assembly 2, thereby improving the sealing performance of the diaphragm 3. Furthermore, the first sealing part and the second sealing part are fixedly connected, i.e., the diaphragm is a single piece. The first sealing part is used for external leakage sealing, and the second sealing part is used for internal leakage sealing. Only one diaphragm is needed to achieve internal and external leakage sealing of the valve device, resulting in a simple structure, reduced assembly steps, and lower costs.

[0069] like Figure 3 As shown, in one possible embodiment, the valve seat assembly 2 has a relief portion 252 that is recessed away from the sealing rib 35, at least a portion of the sealing rib 35 being located in the relief portion 252.

[0070] The clearance portion 252 can be disposed on the edge of the valve seat assembly 2. The clearance portion 252 can be used to accommodate the sealing rib 35, at least a portion of which is located within the clearance portion 252. The clearance portion 252 can limit the sealing rib 35, reducing the possibility of displacement of the sealing rib 35. The shape of the sealing rib 35 along the axial section of the valve device can be circular, elliptical, or semi-circular, etc. The inner wall shape of the clearance portion 252 is adapted to the sealing rib 35, so that the sealing rib 35 can fit tightly against the clearance portion 252.

[0071] Please refer to Figure 8 and Figure 9 In another specific embodiment, the valve seat 25 and the drive assembly 1 can be connected by welding. Specifically, the outermost part of the drive assembly 1 has a plastic coating layer 27. By welding the valve body 24 and the plastic coating layer 27, the connection between the valve seat assembly 25 and the drive assembly 1 is achieved, thereby improving the sealing performance between them. Alternatively, as... Figure 4 As shown, the valve seat assembly 2 and the drive assembly 1 can be connected by the connector 6, for example by bolts.

[0072] like Figure 9 As shown, in one possible embodiment, the valve seat assembly 2 includes a valve body 24 and a valve seat 25, with at least a portion of the valve seat 25 disposed inside the valve body 24. An inlet chamber 21 is located within the valve body 24, and a valve port 26 is located within the valve seat 25. At least a portion of the inlet chamber 21 is located on the side of the valve seat 25 away from the drive assembly 1. Alternatively, the valve seat assembly 2 includes a valve body 24, a valve seat 25, and a seal 5. The valve seat 25 is fixedly connected to the seal 5, and the valve port 26 is located within the seal 5. The seal 5 is elastic, and the valve core assembly 4 can abut against the seal 5, thereby improving the sealing performance of the valve port 26.

[0073] The valve seat 25 has a limiting part 251, and the limiting part 251 has a limiting hole 23. The wall of the limiting hole 23 is limited to contact or clearance fit with the side wall of the valve core assembly 4, and the valve core assembly 4 can move axially along the limiting hole 23. The limiting hole 23 can limit the valve core assembly 4, reduce the possibility of the valve core assembly 4 deviating during movement, and improve its sealing performance.

[0074] A sealing rib 35 is positioned at the edge of the valve seat 25, along the axial direction of the valve assembly. The sealing rib 35 is located between the valve seat 25 and the drive assembly 1, serving as an external leakage seal to prevent fluid from flowing out between the valve seat 25 and the drive assembly 1. Radially along the valve assembly, one side of the sealing rib 35 abuts against the valve body 24, and the other side abuts against the valve seat 25, serving as an internal leakage seal to prevent fluid from entering the balance chamber 32 between the valve seat 25 and the valve body 24, causing balance failure. A triangular-like sealing area is formed between the valve seat 25, the valve body 24, and the drive assembly 1. The sealing rib 35 is located within this sealing area, improving the overall sealing performance of the valve assembly. Compared to current valve assemblies that require multiple different sealing components for sealing, the sealing element 5 provided in this embodiment can achieve both internal and external leakage seals, simplifying the valve assembly structure, reducing the number of parts, and facilitating assembly and processing.

[0075] like Figure 9 As shown, in one possible implementation, the balancing channel 41 includes a first opening 411 and a second opening 412. The first opening 411 is located on the bottom wall of the valve core assembly 4, and the end of the valve core assembly 4 away from the drive assembly 1 is used to close the valve port 26. Therefore, the first opening 411 is located on the bottom wall of the valve core assembly 4 to facilitate fluid entry into the first opening 411. The second opening 412 is located on the side wall of the valve core assembly 4, and the second opening 412 is located on the side of the diaphragm 3 closer to the drive assembly 1. Fluid can enter the balancing channel 41 from the first opening 411 and enter the balancing chamber 32 from the second opening 412, thereby achieving pressure balance on both sides of the diaphragm 3. Along the axial direction of the valve device, the opening of the second opening 412 is further away from the valve port 26 than the mounting hole 31 of the diaphragm 3. Thus, at least part of the diaphragm 3 acts as the bottom wall defining the balancing chamber 32. By increasing the axial projected area of ​​the second sealing part 34, it is easier for the drive device 1 to push the valve core assembly 4, further reducing the driving force of the drive device.

[0076] like Figure 8 and Figure 9 As shown, in one possible implementation, the valve core assembly 4 has a sealing portion 43 at one end near the liquid inlet chamber 21. The sealing portion 43 is arranged circumferentially along the valve core assembly 4 and can close the valve port 26.

[0077] The sealing part 43 extends radially along the valve device. The projection of the sealing part 43 onto the axial direction of the valve device can be circular or elliptical, etc. The shape of the sealing part 43 can be set according to the valve port 26 so as to achieve a good sealing effect on the valve port 26. The size of the sealing part 43 can be slightly larger than the valve port 26. When the valve port 26 is closed, the sealing part 43 can abut against the valve seat 25 to enhance the stability of the seal.

[0078] like Figure 8As shown, in one possible implementation, the drive assembly 1 includes a coil assembly 12, a pressure plate 11, a moving iron core 13, a stationary iron core 15, and an elastic element 16. At least a portion of the stationary iron core 15 is located in the receiving cavity 14 of the coil assembly 12. The receiving cavity 14 is part of the balance cavity 32 and can be used to store fluid, thereby enhancing the effect of balancing pressure. The valve core assembly 4 passes through the moving iron core 13 and the stationary iron core 15. The pressure plate 11 is located on the side of the diaphragm 3 away from the valve seat assembly 2 and abuts against the diaphragm 3. The pressure plate 11 is fixedly connected to the stationary iron core 15. Specifically, the pressure plate and the stationary iron core can be riveted, bonded, welded, etc. To save costs, the coil assembly 12 and the pressure plate 11 are two separate parts. Of course, in other embodiments, the coil assembly and the pressure plate can also be machined into one piece.

[0079] The coil assembly 12 can be connected to an external power source to generate current. The changing current can generate a magnetic field, which causes the moving iron core 13 to move within the receiving cavity 14. The moving iron core 13 can move along the axis of the valve device. The moving iron core 13 is fixedly connected to the valve core assembly 4. When the moving iron core 13 moves, it can drive the valve core assembly 4 to move, thereby controlling the opening and closing of the valve port 26.

[0080] The drive assembly 1 also includes an elastic element 16 and a stationary iron core 15. The stationary iron core 15 is located at the bottom of the moving iron core 13, and the valve core assembly 4 passes through the stationary iron core 15. The elastic element 16 can be a spring, which is compressed and positioned between the stationary iron core 15 and the moving iron core 13. When the power is off, the elastic force of the elastic element 16 drives the valve core assembly 4 and the moving iron core 13 to move upward, thereby closing the valve port 26. The stationary iron core 15 has a mating groove. When the moving iron core 13 moves towards the stationary iron core 15, a portion of the moving iron core 13 can extend into the mating groove, providing support and limiting for the moving iron core 13 and preventing it from detaching from the receiving cavity 14. The pressure plate 11 is a metal part, fixed or in contact with the coil assembly 12, and also fixedly connected to the stationary iron core. When energized, the magnetic field of the coil assembly is transmitted to the stationary iron core through the pressure plate, causing the moving iron core to drive the valve core assembly to move closer to the stationary iron core under the action of the magnetic field, thereby opening the valve port. At least a portion of the diaphragm 3 is located between the pressure plate 11 and the valve seat 25, thereby enhancing the sealing performance of the valve device. Specifically, as shown... Figure 8As shown, the drive assembly 1 and valve body 24 are welded together. A pressure plate 11 is positioned between the drive assembly 1 and valve seat assembly 2, and is fixed to the stationary iron core 15. The first sealing portion 33 of the diaphragm 3 is located between the valve seat 25 and the pressure plate 11. It is easy to understand that the thickness of the first sealing portion 33 is less than the thickness of the sealing rib 35, meaning the compression of the first sealing portion 33 is less than the compression of the sealing rib 35. The pressure plate 11 and the first sealing portion 33 can be in contact or have a gap. Since the diaphragm 3 is a single piece, even if there is a gap between the pressure plate 11 and the first sealing portion 33, the sealing rib 35 seals between the drive assembly 1, valve body 24, and valve seat 25, thus providing an external leakage seal. In another embodiment, as... Figure 2 As shown, the drive assembly 1 and the valve body 24 are connected by the connector 6 (shown in...). Figure 4 In the middle) fixed connection, specifically, the housing 17, pressure plate 11, and valve body 24 of the drive assembly 1 are fixed together by the connector 6, the pressure plate 11 is fixed to the stationary iron core 15, and the first sealing part 33 of the diaphragm 3 is located between the valve seat 25 and the pressure plate 11.

[0081] The above examples illustrate the principles and implementation methods of this utility model. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A valve device, characterized in that, The valve device includes a drive assembly (1), a valve seat assembly (2), a diaphragm (3), and a valve core assembly (4). The valve seat assembly (2) and the drive assembly (1) are fixedly connected. The valve seat assembly (2) has a valve port (26). The drive assembly (1) is kinetically connected to the valve core assembly (4). The valve core assembly (4) is axially movable to open or close the valve port (26). Along the axial direction of the valve device, at least a portion of the diaphragm (3) is disposed between the drive assembly (1) and the valve seat assembly (2). The valve assembly has an inlet chamber (21) and a balance chamber (32). Along the axial direction of the valve device, the valve port (26) is located between the inlet chamber (21) and the balance chamber (32). The valve core assembly (4) has a balance channel (41) that connects the balance chamber (32) and the inlet chamber (21). The diaphragm (3) has a mounting hole (31) that defines the wall of the mounting hole (31) to be sealed with the valve core assembly (4). The diaphragm (3) defines a portion of the wall of the balance chamber (32).

2. The valve device according to claim 1, characterized in that, The balance channel (41) includes a first opening (411) and a second opening (412). The first opening (411) is located on the bottom wall of the valve core assembly (4), and the second opening (412) is located on the side wall of the valve core assembly (4). Along the axial direction of the valve device, the opening of the second opening (412) is further away from the valve port (26) than the mounting hole (31) of the diaphragm (3).

3. The valve device according to claim 1, characterized in that, The wall of the valve port (26) and the diaphragm (3) are arranged along the axial direction of the valve core assembly (4). The diaphragm (3) limits the bottom projection area of ​​the balance chamber (32) to be smaller than the projection area of ​​the valve port (26).

4. The valve device according to any one of claims 1-3, characterized in that, The diaphragm (3) includes a first sealing part (33) and a second sealing part (34), which are fixedly connected or integrated. The first sealing part (33) is located outside the second sealing part (34) and is located between the drive assembly (1) and the valve seat assembly (2). The mounting hole (31) is formed in the second sealing part (34). The second sealing part (34) is sealed to the side wall of the valve core assembly (4). The diaphragm (3) is capable of elastic deformation.

5. The valve device according to claim 4, characterized in that, The second sealing part (34) has a snap-fit ​​part (341) that defines the wall of the mounting hole (31), and the side wall of the valve core assembly (4) has a snap-fit ​​groove (42) and the snap-fit ​​part (341) is located in the snap-fit ​​groove (42).

6. The valve device according to claim 5, characterized in that, The second sealing portion (34) includes a bent portion (342) located on the side of the second sealing portion (34) close to the valve core assembly (4), and the bent portion (342) is deformable when the valve core assembly (4) moves axially.

7. The valve device according to claim 4, characterized in that, The first sealing part (33) has a sealing rib (35) on the side away from the second sealing part (34), the thickness of the sealing rib (35) is greater than the thickness of the first sealing part (33), and at least part of the sealing rib (35) is located between the drive assembly (1) and the valve seat assembly (2).

8. The valve device according to claim 7, characterized in that, The valve seat assembly (2) includes a valve body (24) and a valve seat (25), at least a portion of the valve seat (25) is disposed inside the valve body (24), the drive assembly (1) is fixedly connected to the valve body (24), and at least a portion of the diaphragm (3) is disposed between the drive assembly (1) and the valve body (24) along the axial direction of the valve device; the valve seat assembly (2) has a relief portion (252), the relief portion (252) is recessed away from the sealing rib (35), at least a portion of the sealing rib (35) is located in the relief portion (252), and the sealing rib (35) simultaneously abuts against the drive assembly (1), the valve seat (25) and the valve body (24).

9. The valve device according to claim 8, characterized in that, At least a portion of the inlet chamber (21) is located on the side of the valve seat (25) away from the drive assembly (1); the valve port (26) is located on the valve seat (25), or the valve seat assembly (2) further includes a seal (5), the valve seat (25) is fixedly connected to the seal (5), and the valve port (26) is located on the seal (5); The valve core assembly (4) has a sealing part (43) at one end near the liquid inlet chamber (21). The sealing part (43) is arranged circumferentially along the valve core assembly (4) and can close the valve port (26). The valve seat (25) has a limiting part (251), the limiting part (251) has a limiting hole (23), the wall of the limiting hole (23) is limited to contact or clearance fit with the side wall of the valve core assembly (4), and the valve core assembly (4) can move axially along the limiting hole (23).

10. The valve device according to claim 9, characterized in that, The drive assembly (1) includes a coil assembly (12), a pressure plate (11), a stationary iron core (15), and a moving iron core (13). At least a portion of the moving iron core (13) is located in the receiving cavity (14) of the coil assembly (12). The receiving cavity (14) is part of the balance cavity (32). The valve core assembly (4) passes through the moving iron core (13) and the stationary iron core (15). The pressure plate (11) is located on the side of the diaphragm (3) away from the valve seat assembly (2) and abuts against the diaphragm (3). The pressure plate (11) is fixedly connected to the stationary iron core (15).

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