A valve unit and a gradient proportional valve

Abstract

The application relates to the technical field of proportional valve, and provides a valve unit and a gradient proportional valve, wherein the valve unit comprises a chamber, a deformable deformation piece, a sealing piece and an actuating mechanism; the deformable deformation piece is arranged in the chamber to define a valve cavity; the valve cavity is provided with an inlet port and an outlet port; the sealing piece comprises a sealing part in the valve cavity; and the actuating mechanism is used for driving the sealing part to open or close the outlet port. According to the application, the deformation piece with the deformation capacity is used to define the valve cavity for fluid flow; when the pressure in the valve cavity is increased due to the pump action volume, the deformation of the deformation piece can increase the volume of the valve cavity, thereby reducing the influence of the pump action volume on the pressure in the valve cavity, and the fluid in the valve cavity can be prevented from having large pressure or flow fluctuation as far as possible, so that the application provides greater possibility for realizing accurate control of the inlet flow of each liquid supply of the single valve unit.

Description

Technical Field

[0001] This application relates to the field of proportional valve technology, and more specifically, to a valve unit and a gradient proportional valve. Background Technology

[0002] The content in this section provides only background information related to this application and may not constitute prior art.

[0003] A gradient proportioning valve (GPV) is a type of valve used in the field of fluid proportioning. For example, precision fluid instruments and equipment such as high-performance liquid chromatographs, autodiluents, and autodosing devices often require the use of gradient proportioning valves to mix solutions of different pH or concentrations in proportion.

[0004] In related technologies, gradient proportional valves typically consist of a valve body and multiple valve units (usually proportional solenoid valves). The valve body has a common outlet port, and each valve unit independently controls the flow of fluid from the common outlet port. Furthermore, a single valve unit typically includes a valve chamber with inlet and outlet ports, a seal, and an actuation mechanism. The outlet port of the valve chamber is connected to the common outlet port of the valve body. The seal is located inside the valve chamber and, driven by the actuation mechanism, can open or close the outlet port of the valve chamber, thereby controlling the amount of fluid entering the common outlet port each time.

[0005] However, for a single valve unit in a gradient proportional valve, the pressure inside the valve chamber will increase during the process of closing the outlet port due to the influence of the pump's working volume (i.e., the change in the internal volume of the valve chamber caused by the seal during the valve unit's closure). This will result in large pressure or flow fluctuations in the fluid inside the valve chamber. In this case, it is often difficult to accurately control the amount of liquid supplied by the valve unit in a single supply. Summary of the Invention

[0006] In view of this, the purpose of this application is to provide a valve unit and a gradient proportional valve. The valve unit provided by this application adds a deformable component that can deform inside the valve cavity. During the sealing process, as the pressure inside the valve cavity increases, the deformable component can deform and increase the volume of the valve cavity. In this state, the pressure inside the valve cavity can be effectively reduced, thereby reducing the possibility of large pressure or flow fluctuations in the fluid inside the valve cavity, so as to more accurately control the liquid inlet volume of the valve unit during a single liquid supply.

[0007] The objective of this application is achieved through the following technical solution:

[0008] On the one hand, this application provides a valve unit, including:

[0009] chamber;

[0010] A deformable component is disposed inside the chamber to define a valve chamber, the valve chamber being provided with an inlet port and an outlet port;

[0011] The sealing element includes a sealing portion located within the valve cavity;

[0012] An actuation mechanism is used to drive the sealing part to open or close the liquid outlet port;

[0013] During the process of the sealing part closing the liquid outlet port, the pressure inside the valve cavity increases, causing the deformable part to deform, thereby increasing the volume of the valve cavity.

[0014] In some possible embodiments, the chamber is provided with an opening that faces the liquid outlet port;

[0015] The sealing element further includes a base and a connecting portion. The base is disposed at the opening to seal the opening. The base is provided with at least one channel communicating with the interior of the cavity. The deformable member is disposed on the side of the base away from the cavity to seal the channel.

[0016] The connecting portion has deformability and is used to connect the base and the sealing portion;

[0017] The actuation mechanism includes an actuation shaft and an actuation assembly. The actuation shaft passes through the base and the connecting part in sequence from the outside of the chamber and is connected to the sealing part. The actuation assembly is used to drive the actuation shaft to reciprocate along its axial direction, so as to drive the sealing part to open or close the liquid outlet port through the actuation shaft.

[0018] In some possible embodiments, the connection portion has a corrugated structure.

[0019] In some possible embodiments, the base has an annular receiving groove on the side opposite to the chamber, the channel communicates with the receiving groove, and the deformable member is embedded in the receiving groove to seal the channel.

[0020] In some possible embodiments, the deformable member is provided with a first sealing ring and a second sealing ring on the side away from the base, the first sealing ring being aligned with the inner edge of the deformable member and the second sealing ring being aligned with the outer edge of the deformable member;

[0021] It also includes a positioning sleeve, which is located on the side of the first sealing ring and the second sealing ring away from the deformable part, to press the first sealing ring and the second sealing ring together;

[0022] The actuation mechanism further includes a mounting base, which has a positioning part. The positioning part is embedded in the positioning sleeve and abuts against the base. The actuation shaft passes through the positioning part, the base and the connecting part in sequence and then connects to the sealing part.

[0023] The actuation component is mounted on the mounting base.

[0024] In some possible embodiments, the mounting base further includes an abutting portion disposed around the positioning portion, the abutting portion abutting against the base portion;

[0025] The positioning sleeve is located between the abutment portion and the positioning portion. The positioning sleeve has a corrugated spring sheet on the side facing the mounting base. When the positioning portion is embedded in the positioning sleeve, the mounting base squeezes the corrugated spring sheet.

[0026] In some possible embodiments, the actuation component includes:

[0027] The housing is connected to the mounting base;

[0028] A moving iron core is disposed inside the housing; the end of the actuation shaft away from the sealing part is connected to the moving iron core;

[0029] A stationary iron core is disposed inside the housing and spaced apart from the moving iron core;

[0030] An electromagnetic coil is wound around the periphery of the moving iron core and the stationary iron core, and is located inside the housing;

[0031] An elastic element is disposed between the moving iron core and the stationary iron core, and its two ends are respectively connected to the moving iron core and the stationary iron core.

[0032] In some possible embodiments, the housing is provided with an adjustment port, which is aligned with the end of the stationary iron core away from the moving iron core;

[0033] The stationary iron core is threadedly connected to the inside of the housing.

[0034] In some possible embodiments, the stationary iron core is provided with a limiting groove on the side facing the moving iron core, and the elastic element is disposed in the limiting groove.

[0035] On the other hand, this application provides a gradient proportional valve, comprising:

[0036] The valve body is equipped with a common liquid outlet port;

[0037] Multiple valve units as described above, wherein the chamber of each valve unit is located on the valve body, and the liquid outlet port of each valve unit is connected to the common liquid outlet port.

[0038] The technical solution of this application embodiment has at least the following advantages and beneficial effects:

[0039] This application utilizes a deformable component with deformation capability to define the valve cavity through which the supply fluid flows. When the pressure inside the valve cavity increases due to the influence of the pump's working volume, the deformation of the component can increase the volume of the valve cavity, thereby reducing the influence of the pump's working volume on the pressure inside the valve cavity. This minimizes pressure or flow fluctuations in the fluid inside the valve cavity, thus providing a greater possibility for precise control of the inlet volume of a single valve unit during each supply. Attached Figure Description

[0040] Figure 1 Schematic diagrams of the gradient proportional valve provided for some embodiments of this application;

[0041] Figure 2 Exploded view of a single valve unit provided for some embodiments of this application;

[0042] Figure 3 for Figure 1 A top view of the gradient proportional valve is shown.

[0043] Figure 4 for Figure 3 Sectional view along line AA;

[0044] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0045] Figure 6 for Figure 5 The diagram shown is a schematic of the deformable part undergoing deformation.

[0046] Figure 7 Exploded views of seals and deformable parts provided for some embodiments of this application.

[0047] Icons: 10-Valve body, 11-Common outlet port, 20-Valve unit, 21-Valve cavity, 211-Inlet port, 212-Outlet port, 22-Deformable part, 23-Seal, 231-Sealing part, 232-Base, 233-Connecting part, 234-Channel, 235-Receiving groove, 24-Actuation mechanism, 241-Actuation shaft, 242-Actuation assembly, 2421-Housing, 2422-Moving iron core, 2423-Stationary iron core, 2424-Electromagnetic coil, 2425-Elastic element, 2426-Coil frame, 2427-Limiting groove, 2428-Adjustment port, 243-Mounting base, 2431-Positioning part, 2432-Abutting part, 25-First sealing ring, 26-Second sealing ring, 27-Positioning sleeve, 28-Corrugated spring. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments.

[0049] Please refer to Figure 1 , Figure 3 and Figure 4 It shows the overall structure of the gradient proportional valve disclosed in this application, wherein, Figure 1 A schematic diagram of an exemplary gradient proportional valve is shown. Figure 3 for Figure 1 The top view of the gradient proportional valve shown in the figure. Figure 4 for Figure 1 The image shows a cross-sectional view of the gradient proportional valve.

[0050] Overall, the gradient proportional valve includes a valve body 10 and multiple valve units 20. The valve body 10 has a common outlet port 11, and each of the multiple valve units 20 is used to individually control one stream of fluid to flow out from the common outlet port 11 on the valve body 10. By individually controlling multiple streams of fluid through multiple valve units 20, the multiple fluids flowing out from the common outlet port 11 can complete the subsequent proportional mixing operation.

[0051] The location of the common liquid outlet port 11 is as follows: Figure 1 and Figure 4 As shown, for example, the common outlet port 11 can be a flow channel located at the center of the valve body 10 and extending vertically. In this case, multiple valve units 20 can be arranged in a ring array around the valve body 10 with the common outlet port 11 as the center, so that the distance from each fluid flow controlled by each valve unit 20 to the common outlet port 11 is approximately the same, which is beneficial for more precise control of the amount of liquid supplied by multiple valve units 20 each time.

[0052] For example, the number of valve units 20 can be four, and the four valve units 20 are arranged in a ring array with the common liquid outlet port 11 as the center. Of course, the number of valve units 20 can also be set to any number as needed, such as two, three or more, which is not limited here.

[0053] The inventors of this application have discovered that, with respect to existing known gradient proportional valves of this type, it is often difficult to accurately control the liquid inlet volume when each valve unit 20 is supplied with liquid individually. The reason for this is that each time the valve unit 20 is closed, the pressure inside the valve chamber 21 constituting the valve unit 20 will increase due to the influence of the pump's working volume, thereby causing large pressure or flow fluctuations in the fluid inside the valve chamber 21.

[0054] Although existing technologies exist to address this problem, their effectiveness is not ideal. For example, one known approach is to add a buffer chamber upstream of each valve unit 20 to ensure stable pressure and flow rate of the fluid entering the valve unit 20, thereby reducing the impact of the pump's working volume on the entire flow path and improving the accuracy of fluid supply. However, this approach requires additional components, increasing the size and cost of the gradient proportional valve. Furthermore, the buffering effect has a certain lag, meaning it cannot effectively eliminate the impact of the pump's working volume on the entire flow path.

[0055] To this end, this application also provides a valve unit 20 that can effectively reduce the impact of the pump's working volume on the flow path, thereby achieving more precise control over the amount of liquid supplied each time. Specifically, the valve unit 20 includes a chamber, a deformable element 22, a seal 23, and an actuation mechanism 24.

[0056] In some embodiments of this application, a chamber is disposed on the valve body 10. For example, the chamber may be opened on the side of the valve body 10. In this case, the chamber has an opening on the side wall of the valve body 10 to facilitate the installation of related components such as the actuation mechanism 24.

[0057] The deformable component 22 has deformability; for example, the deformable component 22 can be a thin, flexible diaphragm made of polytetrafluoroethylene, and combined with... Figure 4 and Figure 5 As shown, the modified part 22 is disposed inside the chamber to define a valve chamber 21 through which fluid flows. The valve chamber 21 has an inlet port 211 and an outlet port 212. For example, the inlet port 211 can be a flow channel opened on the valve body 10 and parallel to the common outlet port 11, while the outlet port 212 is a flow channel that extends horizontally and communicates with the common outlet port 11. That is to say, for the multiple valve units 20 constituting the gradient proportional valve, the outlet port 212 of each valve unit 20 is communicated with the common outlet port 11 on the valve body 10.

[0058] The seal 23 is used in conjunction with the actuation mechanism 24 to open or close the liquid outlet port 212, thereby opening and closing the valve unit 20. Specifically, as... Figure 5 As shown, the seal 23 includes a sealing part 231 located in the valve chamber 21, and the actuation mechanism 24 is used to drive the sealing part 231 to open or close the liquid outlet port 212.

[0059] With the above settings, in practical applications, for a single valve unit 20, when the actuating mechanism 24 drives the sealing portion 231 of the seal 23 to open the liquid outlet port 212, as follows: Figure 4As indicated by the middle arrow, the fluid flows from a single valve unit 20 into the common outlet port 11. The single-path fluid controlled by this valve unit 20 enters the valve chamber 21 through the inlet port 211, then flows from the valve chamber 21 into the outlet port 212 and finally out through the common outlet port 11. Correspondingly, when the actuating mechanism 24 drives the sealing portion 231 of the seal 23 to close the outlet port 212, the pressure inside the valve chamber 21 increases due to the pump's working volume. As the pressure in the valve chamber 21 increases, the deformable member 22 will deform under the squeezing action of the fluid inside the valve chamber 21. Figure 6 As shown, specifically, the deformable part 22 will deform in the direction away from the valve cavity 21, thereby increasing the volume of the valve cavity 21. At this time, some of the fluid in the valve cavity 21 flows into the space expanded by the deformation of the deformable part 22, thereby achieving the purpose of reducing the internal pressure of the valve cavity 21, and thus reducing the possibility of large fluctuations in the pressure or flow rate of the fluid inside the valve cavity 21.

[0060] As can be seen, this application uses a deformable member 22 with deformability to define the valve chamber 21 through which the fluid flows. When the pressure inside the valve chamber 21 increases due to the influence of the pump's working volume, the deformation of the deformable member 22 can increase the volume of the valve chamber 21, thereby reducing the influence of the pump's working volume on the pressure inside the valve chamber 21. This minimizes pressure or flow fluctuations in the fluid inside the valve chamber 21, thus providing a greater possibility for precise control of the amount of fluid supplied to a single valve unit 20 each time.

[0061] Combination Figure 5 and Figure 7 As shown, in order to facilitate the placement of the deformable member 22 within the chamber and define a sealed valve chamber 21, in some embodiments of this application, the opening of the chamber can be directly opposite the liquid outlet port 212. In this case, the sealing member 23 may further include a base 232 and a connecting portion 233. The base 232 is disposed at the opening of the chamber to seal the opening, and the base 232 has at least one channel 234 communicating with the interior of the chamber. For example, the channel 234 may be an arc-shaped hole formed on the base 232, and the arc-shaped hole on the base 232 may be one, two, or more.

[0062] At this time, the deformable part 22 is set on the side of the base 232 away from the chamber to seal the channel 234 on the base 232, thereby realizing the joint definition of the valve chamber 21 by the deformable part 22 and the base 232, and ensuring that the fluid in the valve chamber 21 can pass through the channel 234 on the base 232 and contact the deformable part 22, so that the deformable part 22 can deform smoothly when the internal pressure of the valve chamber 21 increases. Since the deformable part 22 is set on the side of the base 232 away from the chamber, it is beneficial to better realize the installation and fixation of the deformable part 22.

[0063] The connecting part 233 also has the ability to deform, and the connecting part 233 is used to connect the base 232 and the sealing part 231. For example, the material of the connecting part 233 can be polytetrafluoroethylene, and the connecting part can extend along the movement direction of the sealing part 231. At this time, one end of the connecting part 233 is connected to the center of the base 232, and the other end of the connecting part 233 is connected to the sealing part 231.

[0064] Meanwhile, in order to enable the actuation mechanism 24 to drive the sealing part 231 to open or close the liquid outlet port 212, in some embodiments of this application, the actuation mechanism 24 may include an actuation shaft 241 and an actuation assembly 242. For example... Figure 5 As shown, the actuation shaft 241 passes through the base 232 and the connecting portion 233 sequentially from the outside of the chamber and connects to the sealing portion 231. For example, the end of the actuation shaft 241 can be embedded inside the sealing portion 231 to improve the reliability of the connection. The actuation assembly 242 is used to drive the actuation shaft 241 to reciprocate along the axial direction of the actuation shaft 241. Since the actuation shaft 241 is connected to the sealing portion 231, when the actuation shaft 241 reciprocates along its axial direction, the actuation shaft 241 will drive the sealing portion 231 to move synchronously, thereby enabling the sealing portion 231 to open or close the liquid outlet port 212 by the actuation shaft 241.

[0065] Understandably, since the connecting part 233 has the ability to deform, when the actuating shaft 241 moves along its axial direction, the connecting part 233 can adapt to the movement of the actuating shaft 241 by deforming along the direction of movement of the actuating shaft 241, so that the connecting part 233 only deforms along the direction of movement of the actuating shaft 241, while the base 232 used to seal the opening of the chamber remains stationary.

[0066] Meanwhile, in some embodiments of this application, the connecting part 233 can be further configured as a corrugated structure. By further configuring the connecting part 233 as a corrugated structure with deformation capability, when the actuating shaft 241 drives the sealing part 231 to move along the axial direction of the actuating shaft 241, the part of the connecting part 233 close to the sealing part 231 will deform first, and as the movement stroke of the sealing part 231 increases, the part of the connecting part 233 away from the sealing part 231 will gradually begin to deform. In other words, by configuring the connecting part as a corrugated structure, the overall deformation of the connecting part 233 when the sealing part 231 moves can be minimized as much as possible. This makes the volume change inside the valve cavity 21 caused by the sealing member 23 smaller when the sealing part 231 opens or closes the liquid outlet port 212, thereby further reducing the possibility of large pressure or flow fluctuations in the fluid inside the valve cavity 21.

[0067] In order to reliably fix the deformable member 22 to the side of the base 232 away from the chamber and define the valve chamber 21, in some embodiments of this application, such as Figure 7 As shown, the base 232 is provided with an annular receiving groove 235 on the side away from the chamber. At this time, the channel 234 on the base 232 is connected to the receiving groove 235, and the deformable part 22 is embedded in the receiving groove 235 to seal the channel 234.

[0068] Meanwhile, in order to achieve a reliable seal between the deformable part 22 and the base 232, and to facilitate the installation and fixation of the actuation assembly 242, in some embodiments of this application, combined with Figure 2 and Figure 5 As shown, the valve unit 20 also includes a first sealing ring 25, a second sealing ring 26, and a positioning sleeve 27. Both the first sealing ring 25 and the second sealing ring 26 are located on the side of the deformable member 22 away from the base 232. The first sealing ring 25 is aligned with the inner edge of the deformable member 22, and the second sealing ring 26 is aligned with the outer edge of the deformable member 22. In other words, the diameter of the first sealing ring 25 is smaller than the diameter of the second sealing ring 26, so that while reliably sealing the deformable member 22, a space can be formed between the first sealing ring 25 and the second sealing ring 26 for the deformable member 22 to deform.

[0069] The positioning sleeve 27 is located on the side of the first sealing ring 25 and the second sealing ring 26 away from the deformable part 22, so as to press the first sealing ring 25 and the second sealing ring 26 by the positioning sleeve 27, thereby achieving a reliable seal on the deformable part 22.

[0070] At this time, the actuation mechanism 24 may also include a mounting base 243, which is provided with a positioning part 2431. The positioning part 2431 is embedded in the positioning sleeve 27 and abuts against the base 232, so that the base 232 is pressed by the positioning part 2431, and the positioning sleeve 27 is pressed against the side of the first sealing ring 25 and the second sealing ring 26 away from the deformable part 22 by the mounting base 243, so that the first sealing ring 25 and the second sealing ring 26 are pressed by the positioning sleeve 27 to achieve a reliable seal on the deformable part 22.

[0071] Of course, in order to reliably limit the positioning sleeve 27, continue to refer to Figure 5 The mounting base 243 may also include an abutment portion 2432 surrounding the positioning portion 2431, and the abutment portion 2432 also abuts against the base 232 to further enhance the fixing effect of the base 232. At this time, the positioning sleeve 27 is located between the abutment portion 2432 and the positioning portion 2431 so as to reliably hold the positioning sleeve 27 on the mounting base 243.

[0072] Simultaneously, a corrugated spring sheet 28 can be provided on the side of the positioning sleeve 27 facing the mounting base 243. When the positioning part 2431 is embedded in the positioning sleeve 27, the mounting base 243 will compress the corrugated spring sheet 28 to provide sufficient preload for the installation of the mounting base 243. For example, as Figure 1 As shown, this facilitates the reliable mounting of the mounting base 243 onto the outer wall of the valve body 10.

[0073] like Figure 5 As shown, the actuating shaft 241 passes sequentially through the positioning part 2431 of the mounting base 243, the base 232 of the seal 23, and the connecting part 233 before connecting to the sealing part 231. This allows the sealing part 231 to open or close the liquid outlet port 212 when the actuating shaft 241 moves axially under the drive of the actuating assembly 242. The actuating assembly 242 can be mounted on the mounting base 243.

[0074] Specifically, such as Figure 4 As shown, in some embodiments of this application, the actuation assembly 242 may include a housing 2421, a moving iron core 2422, a stationary iron core 2423, an electromagnetic coil 2424, and an elastic element 2425. The housing 2421 is connected to the mounting base 243, the moving iron core 2422 is disposed inside the housing 2421, and one end of the actuation shaft 241 away from the sealing part 231 passes through the housing 2421 and connects to the moving iron core 2422. It is understood that in actual implementation, the actuation shaft 241 and the moving iron core 2422 may be an integral structure; for example, the actuation shaft 241 may be a portion extending from the moving iron core 2422.

[0075] The stationary iron core 2423 is also disposed inside the housing 2421, and is spaced apart from the moving iron core 2422. For example, the stationary iron core 2423 can be disposed on the side of the moving iron core 2422 away from the actuation shaft 241, with a gap reserved between them. The electromagnetic coil 2424 is wound around the periphery of the moving iron core 2422 and the stationary iron core 2423, and is also located inside the housing 2421. For example, the electromagnetic coil 2424 can be held inside the housing 2421 by the coil frame 2426. The elastic element 2425 is disposed between the moving iron core 2422 and the stationary iron core 2423, and its two ends are respectively connected to the moving iron core 2422 and the stationary iron core 2423. For example, the elastic element 2425 can be a compression spring, with one end connected to the moving iron core 2422 and the other end connected to the stationary iron core 2423.

[0076] Thus, when the electromagnetic coil 2424 is de-energized, the sealing part 231 closes the liquid outlet port 212, and the elastic element 2425 is in a naturally extended state. When the electromagnetic coil 2424 is energized, it will be magnetized and generate electromagnetic force. At this time, the moving iron core 2422 is attracted by the stationary iron core 2423 under the action of electromagnetic force, which drives the actuating shaft 241 to move along its axial direction toward the stationary iron core 2423. In turn, the actuating shaft 241 drives the sealing part 231 to move away from the liquid outlet port 212 to open the liquid outlet port 212. During this process, the elastic element 2425 is compressed and has a pre-stored elastic force. Conversely, when the electromagnetic coil 2424 is de-energized, the electromagnetic force disappears, and the elastic element 2425 releases the pre-stored elastic force to force the moving iron core 2422 to move away from the stationary iron core 2423. In turn, the actuating shaft 241 drives the sealing part 231 to move toward the liquid outlet port 212 and close the liquid outlet port 212.

[0077] In some embodiments of this application, reference continues to be made to... Figure 4 Alternatively, a limiting groove 2427 can be provided on the side of the stationary iron core 2423 facing the moving iron core 2422, and the elastic element 2425 can be placed in the limiting groove 2427. The limiting groove 2427 can limit the elastic element 2425, which can improve the reliability of the elastic element 2425 when pre-storing or releasing the elastic force.

[0078] Meanwhile, in some embodiments of this application, an adjustment port 2428 can be provided on the housing 2421, and the adjustment port 2428 is aligned with the end of the stationary iron core 2423 away from the moving iron core 2422, and the stationary iron core 2423 is threadedly connected to the inside of the housing 2421. In this way, the stationary iron core 2423 can be screwed from the adjustment port 2428 to change the distance between the moving iron core 2422 and the stationary iron core 2423. By controlling the distance between the moving iron core 2422 and the stationary iron core 2423, the movement stroke of the moving iron core 2422, the actuation shaft 241 and even the sealing part 231 can be effectively controlled, thereby better controlling the consistency of all valve units 20 constituting the gradient proportional valve when opening or closing their respective liquid outlet ports 212.

[0079] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A valve unit, characterized in that, include: chamber; A deformable component is disposed inside the chamber to define a valve chamber, the valve chamber being provided with an inlet port and an outlet port; The sealing element includes a sealing portion located within the valve cavity; An actuation mechanism is used to drive the sealing part to open or close the liquid outlet port; During the process of the sealing part closing the liquid outlet port, the pressure inside the valve cavity increases due to the influence of the pump's working volume, causing the deformable part to deform, thereby increasing the volume of the valve cavity and reducing the pressure inside the valve cavity. The chamber is provided with an opening, which is directly opposite the liquid outlet port; The sealing element further includes a base and a connecting portion. The base is disposed at the opening to seal the opening. The base is provided with at least one channel communicating with the interior of the cavity. The deformable member is disposed on the side of the base away from the cavity to seal the channel. The connecting portion has deformability and is used to connect the base and the sealing portion; The connecting part has a corrugated structure; The actuation mechanism includes an actuation shaft and an actuation assembly. The actuation shaft passes through the base and the connecting part in sequence from the outside of the chamber and is connected to the sealing part. The actuation assembly is used to drive the actuation shaft to reciprocate along its axial direction, so as to drive the sealing part to open or close the liquid outlet port through the actuation shaft.

2. The valve unit according to claim 1, characterized in that, The base has an annular receiving groove on the side opposite to the chamber, the channel communicates with the receiving groove, and the deformable member is embedded in the receiving groove to seal the channel.

3. The valve unit according to claim 2, characterized in that, The deformable part is provided with a first sealing ring and a second sealing ring on the side away from the base. The first sealing ring is aligned with the inner edge of the deformable part, and the second sealing ring is aligned with the outer edge of the deformable part. It also includes a positioning sleeve, which is located on the side of the first sealing ring and the second sealing ring away from the deformable part, to press the first sealing ring and the second sealing ring together; The actuation mechanism further includes a mounting base, which has a positioning part. The positioning part is embedded in the positioning sleeve and abuts against the base. The actuation shaft passes through the positioning part, the base and the connecting part in sequence and then connects to the sealing part. The actuation component is mounted on the mounting base.

4. The valve unit according to claim 3, characterized in that, The mounting base further includes an abutting portion surrounding the positioning portion, the abutting portion abutting against the base portion; The positioning sleeve is located between the abutment portion and the positioning portion. The positioning sleeve has a corrugated spring sheet on the side facing the mounting base. When the positioning portion is embedded in the positioning sleeve, the mounting base squeezes the corrugated spring sheet.

5. The valve unit according to claim 3, characterized in that, The actuation component includes: The housing is connected to the mounting base; A moving iron core is disposed inside the housing; the end of the actuation shaft away from the sealing part is connected to the moving iron core; A stationary iron core is disposed inside the housing and spaced apart from the moving iron core; An electromagnetic coil is wound around the periphery of the moving iron core and the stationary iron core, and is located inside the housing; An elastic element is disposed between the moving iron core and the stationary iron core, and its two ends are respectively connected to the moving iron core and the stationary iron core.

6. The valve unit according to claim 5, characterized in that, The housing is provided with an adjustment port, which is aligned with the end of the stationary iron core that is away from the moving iron core. The stationary iron core is threadedly connected to the inside of the housing.

7. The valve unit according to claim 5, characterized in that, The stationary iron core has a limiting groove on the side facing the moving iron core, and the elastic element is disposed in the limiting groove.

8. A gradient proportional valve, characterized in that, include: The valve body is provided with a common liquid outlet port; a plurality of valve units as described in any one of claims 1-7, wherein the chamber of each valve unit is disposed on the valve body, and the liquid outlet port of each valve unit is connected to the common liquid outlet port.

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