A proportional valve

Abstract

The utility model belongs to the field of valve technology, and specifically discloses a proportional valve, which includes a valve body, a first diaphragm, a second diaphragm and a valve assembly. The valve body is provided with a valve cavity, which includes a first cavity and a second cavity, and the first cavity and the second cavity are connected through a valve port; the valve assembly is arranged in the valve cavity, the valve assembly passes through the valve port, and is used to open or block the valve port; the first diaphragm is located in the first cavity, and the first diaphragm is connected to the first end of the valve assembly and the valve body; the second diaphragm is located in the second cavity, and the second diaphragm is connected to the second end of the valve assembly and the valve body; the force area of ​​the second diaphragm acting on the gas is smaller than the force area of ​​the first diaphragm acting on the gas. The proportional valve provided by the utility model can achieve a dual pressure stabilization effect through the design of double diaphragms, thereby increasing the pressure stabilization range of the proportional valve and improving the anti-seismic performance.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a proportional valve. Background Art

[0002] The gas proportional valve is a key component of household gas instantaneous water heaters, which is used to control the on-off of the gas circuit and the secondary pressure. In the prior art, the gas proportional valve consists of two parts: a solenoid valve and a proportional valve. The solenoid valve controls the on-off of the gas circuit, and the proportional valve adjusts the secondary pressure according to the input current, and also has the on-off control function.

[0003] In the prior art, the proportional valve is provided with a valve assembly for adjusting the opening of its valve port. The valve assembly is usually connected to a pressure-stabilizing diaphragm. When the gas pressure entering the air inlet of the proportional valve increases, the pressure-stabilizing diaphragm is affected by the gas pressure to drive the valve assembly to move and reduce the valve port opening. The existing proportional valve is generally suitable for situations where the gas pressure is relatively low (pressure does not exceed 5kPa), and the pressure stabilization range is relatively small. Utility Model Content

[0004] The technical problem solved by the utility model is to provide a proportional valve, which can increase the pressure stabilizing range of the proportional valve.

[0005] The above technical problems are solved by the following technical solutions:

[0006] A proportional valve, comprising:

[0007] A valve body, wherein a valve cavity is disposed in the valve body, wherein the valve cavity includes a first cavity and a second cavity, and the first cavity and the second cavity are connected through a valve port;

[0008] A valve assembly is disposed in the valve cavity, the valve assembly passes through the valve port, and is used to open or block the valve port;

[0009] A first diaphragm is located in the first cavity, and the first diaphragm is connected to the first end of the valve assembly and the valve body;

[0010] The second diaphragm is located in the second cavity, and the second diaphragm is connected to the second end of the valve assembly and the valve body; the force area of ​​the second diaphragm acting on the gas is smaller than the force area of ​​the first diaphragm acting on the gas.

[0011] Compared with the background technology, the proportional valve of the utility model has the following beneficial effects:

[0012] When the proportional valve is working, the valve port opens and the gas enters the valve cavity. When the gas pressure changes, the gas acts on the first diaphragm and the second diaphragm. Since the force-bearing area of ​​the first diaphragm is larger than the force-bearing area of ​​the second diaphragm, there is a pressure difference between the first diaphragm and the second diaphragm, which can drive the valve assembly to move, so that the overall opening of the valve port changes accordingly, thereby achieving the effect of voltage regulation and stabilization. The dual diaphragm design can achieve a dual voltage stabilization effect, thereby increasing the voltage stabilization range of the proportional valve and improving the anti-seismic performance.

[0013] In one embodiment, the valve body is provided with an air inlet and an air outlet, the air inlet is connected to the second cavity, and the air outlet is connected to the first cavity; when the valve assembly blocks the valve port, the valve assembly blocks the side of the valve port close to the second diaphragm.

[0014] In one embodiment, a first valve cover is provided at the first end of the valve body, a periphery of the first diaphragm is sandwiched between the valve body and the first valve cover, the first valve cover and the first diaphragm enclose a first pressure-stabilizing cavity, a first damping hole is provided at the periphery of the first diaphragm, and the first pressure-stabilizing cavity is connected to the external space of the valve body through the first damping hole; and / or

[0015] A second valve cover is provided at the second end of the valve body, the periphery of the second diaphragm is clamped between the valve body and the second valve cover, the second valve cover and the second diaphragm enclose a second pressure-stabilizing chamber, a second damping hole is provided at the periphery of the second diaphragm, and the second pressure-stabilizing chamber is connected to the external space of the valve body through the second damping hole.

[0016] In one embodiment, the second membrane comprises:

[0017] A sealing ring portion connected to the valve body;

[0018] A deformable ring portion is arranged on the inner side of the sealing ring portion, and the deformable ring portion is a concave ring structure which is concavely arranged in a direction away from the valve port;

[0019] The connecting portion is arranged on the inner side of the deformable ring portion, and the connecting portion is connected to the second end of the valve assembly.

[0020] In one embodiment, the valve assembly includes a valve core and a valve member, the first end of the valve core is connected to the first diaphragm, the second end of the valve core passes through the valve port and is sequentially connected to the valve member and the second diaphragm, and the side of the valve member facing the valve port is provided with a plane capable of sealing the valve port.

[0021] In one embodiment, a first ear portion is radially protruded from a periphery of the first diaphragm, and the first damping hole is disposed on the first ear portion; and / or

[0022] A second ear portion is protruded radially from the periphery of the second diaphragm, and a second damping hole is provided on the second ear portion.

[0023] In one embodiment, a first ear portion is radially protruded from the periphery of the first diaphragm, a first through hole is provided on the first ear portion, a first vent is passed through the first through hole, and the first vent is provided with the first damping hole; and / or

[0024] A second ear portion is protruded radially from the periphery of the second diaphragm, a second through hole is provided on the second ear portion, a second ventilator is inserted into the second through hole, and the second damping hole is provided on the second ventilator.

[0025] In one embodiment, one of the second end of the valve core and the second diaphragm is provided with a clamping protrusion, and the other is provided with a first clamping groove, and the clamping protrusion is clamped in the first clamping groove.

[0026] In one of the embodiments, it also includes a coil assembly arranged at the first end of the valve body, the coil assembly includes an electromagnetic coil and a magnetic core passing through the electromagnetic coil, and a permanent magnet is provided at the first end of the valve assembly; when the electromagnetic coil is not energized, the permanent magnet is adsorbed on the magnetic core so that the valve assembly blocks the valve port.

[0027] In one of the embodiments, a mounting seat is provided at the first end of the valve assembly, a pressure cover is clamped on the mounting seat, and the permanent magnet is fixed between the mounting seat and the pressure cover.

[0028] In one embodiment, the mounting seat and the first diaphragm are sequentially mounted on the first end of the valve assembly, and the first end of the valve assembly is clamped with a limiting member, the side of the mounting seat facing the second diaphragm is abutted against the first diaphragm, and the limiting member is abutted against the side of the mounting seat facing away from the first diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A cross-sectional view of a proportional valve provided by the utility model;

[0030] Figure 2 The utility model provides Figure 1 A is an enlarged structural diagram;

[0031] Figure 3 The utility model provides Figure 1 The enlarged structural diagram at B in FIG.

[0032] Figure 4 A schematic diagram of the connection structure of the second end of the valve core provided by the utility model;

[0033] Figure 5 An exploded view of a partial structure of a proportional valve provided by the utility model;

[0034] Figure 6 The utility model provides a schematic diagram of the principle structure of the proportional valve.

[0035] Description of labels:

[0036] 100, valve body; 101, valve port; 102, valve cavity; 1021, first cavity; 10211, air outlet; 1022, second cavity; 10221, air inlet;

[0037] 200, first diaphragm; 201, first damping hole; 210, first ear portion; 211, first ventilator; 2111, first cap body portion; 2112, first cap brim portion; 220, annular recess;

[0038] 300, second diaphragm; 301, second damping hole; 302, first slot; 310, sealing ring portion; 320, deformation ring portion; 330, connecting portion; 340, second ear portion; 341, second ventilator; 3411, second cap body portion; 3412, second cap brim portion;

[0039] 400, valve assembly; 410, valve core; 411, annular groove; 412, clamping protrusion; 420, valve member; 430, permanent magnet; 440, mounting seat; 450, gland; 451, pressing ring; 452, clamping claw; 460, limiter;

[0040] 500, first valve cover; 501, first pressure stabilizing chamber; 502, first channel;

[0041] 600, second valve cover; 601, second pressure stabilizing chamber; 602, second channel;

[0042] 700, coil assembly; 710, electromagnetic coil; 720, magnetic core; 730, bracket; 740, fastener. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0044] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0045] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0046] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] Reference Figures 1 to 6 As shown, this embodiment provides a proportional valve, which includes a valve body 100 , a first diaphragm 200 , a second diaphragm 300 and a valve assembly 400 .

[0048] Specifically, a valve cavity 102 is provided in the valve body 100, and the valve cavity 102 includes a first cavity 1021 and a second cavity 1022, and the first cavity 1021 and the second cavity 1022 are connected through the valve port 101; the valve assembly 400 is provided in the valve cavity 102, and the valve assembly 400 passes through the valve port 101, and is used to open or block the valve port 101; the first diaphragm 200 is located in the first cavity 1021, and the first diaphragm 200 is connected to the first end of the valve assembly 400 and the valve body 100; the second diaphragm 300 is located in the second cavity 1022, and the second diaphragm 300 is connected to the second end of the valve assembly 400 and the valve body 100. Among them, the force area of ​​the second diaphragm 300 acting on the gas is smaller than the force area of ​​the first diaphragm 200 acting on the gas.

[0049] In one embodiment, the valve body 100 is provided with an outlet 10211 communicating with the first cavity 1021 and an inlet 10221 communicating with the second cavity 1022. When the valve assembly 400 blocks the valve port 101, the valve assembly 400 blocks the side of the valve port 101 close to the second diaphragm 300. The first cavity 1021 is connected to the outlet pipeline through the outlet 10211, and the second cavity 1022 is connected to the inlet pipeline through the inlet 10221. When the valve port 101 is closed, the gas pressure of the gas can act on the valve assembly 400, so that the valve assembly 400 and the valve port 101 are in closer contact, thereby improving the sealing performance when the valve port 101 is closed.

[0050] It is understandable that, in other embodiments, the first cavity 1021 may also be connected to the air inlet pipeline, and the second cavity 1022 may be connected to the air outlet pipeline.

[0051] When the proportional valve is working, the valve port 101 is open; for example, the gas enters the valve body 100 through the second cavity 1022. When the gas pressure increases, the second diaphragm 300 is affected by the gas pressure, and the second diaphragm 300 drives the valve assembly 400 to move, and the opening of the valve port 101 increases. However, at the same time, the first diaphragm 200 is also affected by the gas pressure, and because the force-bearing area of ​​the first diaphragm 200 is larger than the force-bearing area of ​​the second diaphragm 300, the force on the first diaphragm 200 is larger than the force on the second diaphragm 300. The first diaphragm 200 will drive the valve assembly 400 to move, and finally reduce the overall opening of the valve port 101 to achieve pressure stabilization. Through the design of the double diaphragms, the first diaphragm 200 and the second diaphragm 300 play a buffering role on the gas, which can achieve the effect of double pressure stabilization, thereby increasing the pressure stabilization range of the proportional valve and improving the anti-seismic performance.

[0052] In a feasible implementation manner, the first diaphragm 200 and the second diaphragm 300 are made of the same material.

[0053] In a possible implementation, Figure 1 and Figure 2 As shown, the first end of the valve body 100 is provided with a first valve cover 500, the periphery of the first diaphragm 200 is sandwiched between the valve body 100 and the first valve cover 500, the first valve cover 500 and the first diaphragm 200 enclose a first pressure stabilizing chamber 501, the periphery of the first diaphragm 200 is provided with a first damping hole 201, and the first pressure stabilizing chamber 501 is communicated with the external space of the valve body 100 through the first damping hole 201. In this embodiment, when the gas pressure entering the valve cavity 102 is unstable and causes the first diaphragm 200 to fluctuate, a pressure difference is formed between the first pressure stabilizing chamber 501 and the outside, and air can enter or be discharged from the first pressure stabilizing chamber 501 through the first damping hole 201, changing the frequency of the fluctuation of the first diaphragm 200, effectively stabilizing the outlet pressure of the valve cavity 102, and reducing the frequency of gas vibration.

[0054] Exemplarily, the diameter of the first damping hole 201 is 0.2 mm-0.5 mm, which can more effectively reduce the frequency of gas vibration.

[0055] Exemplarily, a first channel 502 communicating with the outside of the valve body 100 is formed between the first diaphragm 200 and the valve body 100 , and the first pressure stabilizing chamber 501 is connected to the first channel 502 via the first damping hole 201 .

[0056] In some embodiments, a first ear portion 210 may be radially protruded from the periphery of the first diaphragm 200, and a first damping hole 201 may be provided on the first ear portion 210. By providing the first ear portion 210, the frequency of occurrence of gas vibration is reduced while effectively ensuring the sealing between the valve body 100, the first valve cover 500 and the first diaphragm 200.

[0057] In other embodiments, the first ear portion 210 may be provided with a first through hole, a first vent 211 may be inserted into the first through hole, and the first vent 211 is provided with a first damping hole 201. In this embodiment, the first vent 211 with different sizes of the first damping hole 201 is installed on the first diaphragm 200, so that the proportional valve can adapt to different application environments, improve applicability, and facilitate the processing and manufacturing of the first diaphragm 200.

[0058] Exemplarily, the first ventilation piece 211 can be a cap-shaped structure, including a first cap body portion 2111 and a first brim portion 2112, the first cap body portion 2111 is penetrated by a first through hole, the first brim portion 2112 is overlapped on the first ear portion 210, and the first ventilation piece 211 and the first ear portion 210 have good sealing properties for easy assembly.

[0059] In a possible implementation, Figure 1 and Figure 3 As shown, the second end of the valve body 100 is provided with a second valve cover 600, the periphery of the second diaphragm 300 is sandwiched between the valve body 100 and the second valve cover 600, the second valve cover 600 and the second diaphragm 300 enclose a second pressure stabilizing chamber 601, the periphery of the second diaphragm 300 is provided with a second damping hole 301, and the second pressure stabilizing chamber 601 is communicated with the external space of the valve body 100 through the second damping hole 301. In this embodiment, when the proportional valve is working and the gas pressure entering the valve chamber 102 is unstable, causing the second diaphragm 300 to fluctuate, a pressure difference is formed between the second pressure stabilizing chamber 601 and the outside, and air can enter or be discharged from the first pressure stabilizing chamber 501 through the second damping hole 301, changing the frequency of the fluctuation of the second diaphragm 300, effectively stabilizing the outlet pressure of the valve chamber 102, and reducing the frequency of gas vibration.

[0060] Exemplarily, the diameter of the second damping hole 301 is 0.2 mm-0.5 mm, which can more effectively reduce the frequency of gas vibration.

[0061] Exemplarily, a second channel 602 communicating with the outside of the valve body 100 is formed between the second diaphragm 300 and the valve body 100 , and the second pressure stabilizing chamber 601 is connected to the second channel 602 through the second damping hole 301 .

[0062] In some embodiments, a second ear 340 may be radially protruded from the periphery of the second diaphragm 300, and a second damping hole 301 may be provided on the second ear 340. By providing the second ear 340, the frequency of occurrence of gas vibration is reduced while effectively ensuring the sealing between the valve body 100, the first valve cover 500 and the first diaphragm 200.

[0063] In other embodiments, the second ear portion 340 may be provided with a second through hole, a second vent 341 may be inserted into the second through hole, and a second damping hole 301 is provided on the second vent 341. In this embodiment, the second vent 341 with different sizes of the second damping hole 301 is installed on the second diaphragm 300, so that the proportional valve can adapt to different application environments, improve applicability, and facilitate the processing and manufacturing of the second diaphragm 300.

[0064] Exemplarily, the second ventilation piece 341 can be a cap-shaped structure, including a second cap body portion 3411 and a second brim portion 3412, the second cap body portion 3411 is penetrated by a second through hole, and the second brim portion 3412 is overlapped on the second ear portion 340 for easy assembly, and the second ventilation piece 341 and the second ear portion 340 have good sealing properties.

[0065] In this embodiment, when the first diaphragm 200 is provided with a first damping hole 201 and the second diaphragm 300 is provided with a second damping hole 301 , the outlet pressure of the valve chamber 102 can be more effectively stabilized.

[0066] In this embodiment, refer to Figures 4 to 6 As shown, the valve assembly 400 may include a valve core 410 and a valve member 420. The first end of the valve core 410 is connected to the first diaphragm 200. The second end of the valve core 410 is provided with a valve port 101 and is connected to the valve member 420 and the second diaphragm 300 in sequence. The valve member 420 is provided with a plane that can block the valve port 101 on one side facing the valve port 101. In this embodiment, when the proportional valve is working, the valve member 420 is separated from the valve port 101, and the valve member 420 will not extend into the valve port 101. Even if the air flow in the valve cavity 102 vibrates and causes the valve member 420 to swing, the plane of the valve member 420 used to block the valve port 101 will not collide with the valve port 101, thereby effectively ensuring the service life of the proportional valve and reducing the noise of the valve member 420 hitting the valve port 101.

[0067] In a feasible embodiment, an annular groove 411 is provided on the periphery of the second end of the valve core 410, and the valve member 420 is provided with a through hole. The second end of the valve core 410 is penetrated through the through hole, and the valve member 420 is clamped in the annular groove 411, so as to facilitate the assembly of the valve member 420 on the valve core 410.

[0068] In a feasible implementation, one of the second end of the valve core 410 and the second diaphragm 300 is provided with a clamping protrusion 412, and the other is provided with a first clamping groove 302, and the clamping protrusion 412 is clamped in the first clamping groove 302, so as to facilitate the connection between the valve core 410 and the second diaphragm 300. Exemplarily, the first clamping groove 302 can be a stepped groove, and the corresponding clamping protrusion 412 is in an inverted shape. Exemplarily, the second diaphragm 300 is provided with a first clamping groove 302, and the valve core 410 is provided with a clamping protrusion 412.

[0069] In this embodiment, refer to Figure 1 , Figure 3 and Figure 4 As shown, the second diaphragm 300 includes a sealing ring portion 310, a deforming ring portion 320 and a connecting portion 330. The sealing ring portion 310 is connected to the valve body 100; the deforming ring portion 320 is arranged on the inner side of the sealing ring portion 310, and the deforming ring portion 320 is a concave ring structure that is concavely arranged away from the valve port 101; the connecting portion 330 is arranged on the inner side of the deforming ring portion 320, and the connecting portion 330 is connected to the second end of the valve assembly 400. In this embodiment, the second diaphragm 300 forms a seal with the valve body 100 through the sealing ring portion 310, effectively ensuring the sealing of the valve cavity 102 and the second pressure stabilizing cavity 601; the action of the valve assembly 400 drives the deforming ring portion 320 to deform through the connecting portion 330, that is, the deforming ring portion 320 provides a deformable amount for the second diaphragm 300, so that the second diaphragm 300 has a good pressure stabilizing effect.

[0070] Specifically, the connecting portion 330 is connected to the second end of the valve core 410 , that is, the connecting portion 330 is provided with a first clamping groove 302 or a clamping protrusion 412 .

[0071] Specifically, the sealing ring portion 310 is pressed and fixed between the valve body 100 and the second valve cover 600 , and the damping hole is provided on the sealing ring portion 310 .

[0072] Exemplarily, the sealing ring portion 310 , the deforming ring portion 320 and the connecting portion 330 are coaxially arranged to ensure the stability of the valve core 410 and effectively prevent the valve core 410 from swinging when it moves.

[0073] In this embodiment, refer to Figure 1As shown, the first diaphragm 200 includes an annular recess 220. It can be understood that the force area of ​​the second diaphragm 300 acting on the gas is usually calculated based on the diameter of the deformed ring portion 320, while the force area of ​​the first diaphragm 200 acting on the gas is usually calculated based on the diameter of the annular recess 220. If the force area of ​​the second diaphragm 300 is smaller than that of the first diaphragm 200, then the diameter of the deformed ring portion 320 is smaller than the diameter of the annular recess 220.

[0074] In this embodiment, refer to Figure 1 , Figure 5 and Figure 6 As shown, the proportional valve also includes a coil assembly 700 disposed at the first end of the valve body 100, and the coil assembly 700 is used to drive the valve assembly 400 to open or close the valve port 101. In this embodiment, the coil assembly 700 has an energized state and an off-power state. In the off-power state, a seal is formed between the second end of the valve assembly 400 and the valve port 101, that is, the valve member 420 blocks and closes the valve port 101; in the energized state, the coil assembly 700 and the first end of the valve assembly 400 are magnetically repelled from each other, and a gap is formed between the second end of the valve assembly 400 and the valve port 101, that is, the valve member 420 is separated from the valve port 101, and the valve port 101 is opened. In addition, the size of the gap between the valve member 420 and the valve port 101, that is, the valve opening, can be adjusted by the coil assembly 700 to output the required secondary pressure.

[0075] Specifically, the coil assembly 700 includes an electromagnetic coil 710 and a magnetic core 720 that penetrates the electromagnetic coil 710. When the electromagnetic coil 710 is not energized, the permanent magnet 430 is adsorbed on the magnetic core 720, so that the valve assembly 400 blocks the valve port 101. When the electromagnetic coil 710 is energized, the magnetic core 720 and the permanent magnet 430 repel each other magnetically, so that the valve assembly 400 has a tendency to move toward the second end of the valve body 100 to open the valve port 101. Exemplarily, the permanent magnet 430 can be arranged outside the valve cavity 102. Exemplarily, the permanent magnet 430 can be set as a permanent magnet.

[0076] In a feasible embodiment, a mounting seat 440 is provided at the first end of the valve assembly 400, a pressure cap 450 is clamped on the mounting seat 440, and the permanent magnet 430 is fixed between the mounting seat 440 and the pressure cap 450, so as to facilitate the installation and fixation of the permanent magnet 430. Specifically, the pressure cap 450 includes a pressure ring portion 451 and a plurality of clamping claws 452 arranged at intervals around the pressure ring portion 451, and a plurality of second clamping grooves corresponding to the clamping claws 452 are provided on the mounting seat 440, and the clamping claws 452 are clamped with the second clamping grooves to limit and fix the permanent magnet 430 between the pressure ring portion 451 and the mounting seat 440. Among them, the permanent magnet 430 is exposed from the central hole of the pressure ring portion 451 on the side facing the magnetic core 720 to ensure the magnetic force between the permanent magnet 430 and the magnetic core 720.

[0077] In a feasible implementation, the mounting seat 440 and the first diaphragm 200 are sequentially sleeved on the first end of the valve assembly 400, and the first end of the valve assembly 400 is clamped with the limiting member 460, and the limiting member 460 is abutted against the side of the mounting seat 440 facing away from the first diaphragm 200, and the first diaphragm 200 and the mounting seat 440 are pressed and fixed to the first end of the valve assembly 400 by the limiting member 460, so as to facilitate the assembly between the first diaphragm 200 and the mounting seat 440 and the valve assembly 400. Among them, the first end of the valve core 410 is in the shape of a stepped shaft, and the limiting member 460, the first diaphragm 200 and the mounting seat 440 are sequentially sleeved on the small shaft portion of the first end of the valve core 410, and the limiting member 460 is clamped with the small shaft portion of the first end of the valve core 410.

[0078] Exemplarily, the limiting member 460 may be configured as an elastic card.

[0079] In some embodiments, the second end of the valve assembly 400 may be provided with an elastic body (not shown), which always pushes the valve assembly 400 toward the first end of the valve body 100, and closes the valve when the coil assembly 700 is powered off. The elastic body may be provided in the second pressure stabilizing chamber 601, and the elastic body may be supported by the second valve cover 600. Exemplarily, the elastic body may be provided as a spring. In this embodiment, the permanent magnet 430 may be replaced by a non-magnetic armature.

[0080] In this embodiment, refer to Figure 1 As shown, the coil assembly 700 also includes a bracket 730 and a fastener 740. The bracket 730 is arranged at the first end of the valve body 100, and the bracket 730 is threadedly connected to the magnetic core 720; the fastener 740 is threadedly connected to the magnetic core 720 and abuts against the bracket 730. In this embodiment, the bracket 730 is threadedly connected to the magnetic core 720, and the distance between the magnetic core 720 and the permanent magnet 430 can be adjusted, thereby realizing the setting of the minimum secondary pressure initial value of the proportional valve, and the fastener 740 abuts against the bracket 730, which can ensure the stability of the connection between the bracket 730 and the magnetic core 720, and effectively prevent the connection from loosening. Exemplarily, the bracket 730 can be arranged on the first valve cover 500. Exemplarily, the fastener 740 can be set as a nut.

[0081] It is understandable that for connection methods not explicitly described in the text, common connection methods such as threaded connection, welding or bonding can be selected according to needs.

[0082] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features 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 specification.

[0083] The specific contents of the above specific implementations only express several implementations of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A proportional valve, characterized in that: include: A valve body (100), wherein a valve cavity (102) is provided in the valve body (100), wherein the valve cavity (102) comprises a first cavity (1021) and a second cavity (1022), wherein the first cavity (1021) and the second cavity (1022) are connected via a valve port (101); A valve assembly (400) is disposed in the valve cavity (102); the valve assembly (400) passes through the valve port (101) and is used to open or block the valve port (101); A first diaphragm (200) is located in the first cavity (1021), and the first diaphragm (200) is connected to a first end of the valve assembly (400) and the valve body (100); The second diaphragm (300) is located in the second cavity (1022), and the second diaphragm (300) is connected to the second end of the valve assembly (400) and the valve body (100); the force area of ​​the second diaphragm (300) acting on the gas is smaller than the force area of ​​the first diaphragm (200) acting on the gas.

2. The proportional valve according to claim 1, characterized in that: The valve body (100) is provided with an air inlet (10221) and an air outlet (10211); the air inlet (10221) is connected to the second cavity (1022), and the air outlet (10211) is connected to the first cavity (1021); when the valve assembly (400) blocks the valve port (101), the valve assembly (400) blocks the side of the valve port (101) close to the second diaphragm (300).

3. The proportional valve according to claim 1, characterized in that: A first valve cover (500) is provided at the first end of the valve body (100); the periphery of the first diaphragm (200) is clamped between the valve body (100) and the first valve cover (500); the first valve cover (500) and the first diaphragm (200) enclose a first pressure-stabilizing cavity (501); a first damping hole (201) is provided at the periphery of the first diaphragm (200); the first pressure-stabilizing cavity (501) is communicated with the external space of the valve body (100) through the first damping hole (201); and / or A second valve cover (600) is provided at the second end of the valve body (100); the periphery of the second diaphragm (300) is clamped between the valve body (100) and the second valve cover (600); the second valve cover (600) and the second diaphragm (300) enclose a second pressure-stabilizing chamber (601); a second damping hole (301) is provided at the periphery of the second diaphragm (300); the second pressure-stabilizing chamber (601) is connected to the external space of the valve body (100) through the second damping hole (301).

4. The proportional valve according to claim 3, characterized in that: A first ear portion (210) is radially protruded from the periphery of the first diaphragm (200), and the first damping hole (201) is provided on the first ear portion (210); and / or A second ear portion (340) is protruded radially from the periphery of the second diaphragm (300), and a second damping hole (301) is provided on the second ear portion (340).

5. The proportional valve according to claim 3, characterized in that: A first ear portion (210) is radially protruded from the periphery of the first diaphragm (200), a first through hole is provided on the first ear portion (210), a first vent (211) is inserted into the first through hole, and the first vent (211) is provided with the first damping hole (201); and / or A second ear portion (340) is radially protruded from the periphery of the second diaphragm (300), a second through hole is provided on the second ear portion (340), a second vent (341) is inserted into the second through hole, and the second vent (341) is provided with the second damping hole (301).

6. The proportional valve according to claim 1, characterized in that: The second membrane (300) comprises: A sealing ring portion (310) connected to the valve body (100); A deformable ring portion (320) is arranged on the inner side of the sealing ring portion (310), and the deformable ring portion (320) is a concave ring structure that is concavely arranged in a direction away from the valve port (101); The connecting portion (330) is arranged on the inner side of the deformable ring portion (320), and the connecting portion (330) is connected to the second end of the valve assembly (400).

7. The proportional valve according to claim 1, characterized in that: The valve assembly (400) comprises a valve core (410) and a valve member (420); the first end of the valve core (410) is connected to the first diaphragm (200); the second end of the valve core (410) passes through the valve port (101) and is connected to the valve member (420) and the second diaphragm (300) in sequence; and the valve member (420) is provided with a plane capable of sealing the valve port (101) on one side facing the valve port (101).

8. The proportional valve according to claim 7, characterized in that: One of the second end of the valve core (410) and the second diaphragm (300) is provided with a clamping protrusion (412), and the other is provided with a first clamping groove (302), and the clamping protrusion (412) is clamped in the first clamping groove (302).

9. The proportional valve according to any one of claims 1 to 8, characterized in that: It also includes a coil assembly (700) arranged at the first end of the valve body (100), the coil assembly (700) including an electromagnetic coil (710) and a magnetic core (720) passing through the electromagnetic coil (710), and the first end of the valve assembly (400) is provided with a permanent magnet (430); when the electromagnetic coil (710) is not energized, the permanent magnet (430) is attracted to the magnetic core (720) so that the valve assembly (400) blocks the valve port (101).

10. The proportional valve according to claim 9, characterized in that: A mounting seat (440) is provided at the first end of the valve assembly (400), a pressure cover (450) is clamped on the mounting seat (440), and the permanent magnet (430) is fixed between the mounting seat (440) and the pressure cover (450).

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