Valve element assembly and gas proportional valve

Abstract

The utility model belongs to the technical field of valves, and particularly discloses a valve element assembly and a gas proportional valve. The valve element assembly comprises a valve element seat, a sealing head, a magnet and an elastic sealing unit. Wherein the sealing head and the valve core seat are coaxially arranged on the outer side of the valve core seat in a sleeving manner; the magnet and the sealing head are coaxially installed on the valve element seat, and at least part of the magnet is located on the inner side of the sealing head. The elastic sealing unit is coaxially arranged on the outer side of the valve element seat in a sealing and sleeving mode, the sealing head and the magnet are located on the same side of the elastic sealing unit, and the elastic sealing unit can be pressed to deform so as to apply axial force to the valve element seat. The gas proportional valve comprises the valve element assembly. According to the valve element assembly and the fuel gas proportional valve, the deflection amplitude generated when the valve element assembly is used can be reduced, the pressure and flow stabilizing performance of the fuel gas proportional valve is improved, and gas vibration and noise in the using process of the fuel gas proportional valve are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field especially relates to a valve core subassembly and gas proportional valve. BACKGROUND

[0002] The gas proportional valve is the core component of the gas water heater, and its functions include stabilizing the output pressure of the gas and adjusting the flow of the gas according to the size of the control current.

[0003] The prior art provides a kind of gas proportional valve, it includes valve body, valve core subassembly, electromagnetic assembly and elastic piece.Wherein, valve body includes the valve seat and valve cover of buckle connection, valve seat is provided with air inlet, gas outlet and airflow channel, airflow channel is provided with proportional valve port;Valve core subassembly is installed in airflow channel, valve core subassembly includes valve shaft, sealing element installed at one end of valve shaft, diaphragm set on valve shaft and magnet installed at the other end of valve shaft, diaphragm is between magnet and sealing element, and both ends of diaphragm are clamped between valve cover and valve body.Electromagnetic assembly is installed on valve cover and located at one end of valve core subassembly provided with magnet.When electromagnetic assembly is not electrified, valve core subassembly is blocked proportional valve port under the action of elastic piece;When electromagnetic assembly is electrified, electromagnetic assembly cooperates with magnet to drive valve core subassembly to move in the direction away from electromagnetic assembly to open proportional valve port.

[0004] The gas proportional valve provided by prior art, sealing element and magnet are respectively arranged at both ends of valve shaft, since magnet is arranged close to diaphragm, and sealing element is arranged away from diaphragm, when diaphragm is deformed or moved in non-axial direction under the impact of turbulent gas flow, magnet will be offset, and then magnet deviates from center, the offset of this kind of magnet is amplified through long arm between sealing element and diaphragm, which will cause sealing element to be offset in large amplitude, thereby affecting the opening degree of proportional valve port, and unstable pressure and flow will occur, accompanied by gas vibration noise, which affects the control precision of gas proportional valve on pressure and flow, and increases noise when gas proportional valve operates;At the same time, when valve shaft is adjusted in flow, the difference between the distance between valve core and diaphragm outer peripheral mounting surface and the distance between magnet and diaphragm outer peripheral mounting surface will change, which further affects the operation stability of valve core subassembly. UTILITY MODEL CONTENTS

[0005] One of the technical problems solved by the utility model is to provide a valve core subassembly, which can effectively solve the problem of large offset of sealing head caused by large difference between the distance of magnet and sealing head and diaphragm, and further produce unstable pressure and gas vibration noise, reduce the offset amplitude of sealing head, and improve the use reliability of valve core subassembly.

[0006] The technical problem solved by the utility model is to provide a gas proportional valve which can effectively solve the problem of reduced control precision of pressure and flow of the gas proportional valve caused by large displacement of the sealing head in the valve core assembly, improve the control precision of the gas proportional valve and improve the use reliability of the gas proportional valve.

[0007] The first technical problem is solved by the following technical scheme:

[0008] A valve core assembly comprises:

[0009] A valve core seat;

[0010] A sealing head is coaxially arranged on the outer side of the valve core seat;

[0011] A magnet is coaxially arranged on the valve core seat and at least partially located on the inner side of the sealing head;

[0012] An elastic sealing unit is coaxially and sealingly arranged on the outer side of the valve core seat, and the sealing head and the magnet are located on the same side of the elastic sealing unit, and the elastic sealing unit can be deformed under pressure to apply an axial force to the valve core seat.

[0013] Compared with the background art, the valve core assembly has the beneficial effects that: since the sealing head and the magnet are both arranged on the same side of the elastic sealing unit and the magnet is at least partially located on the inner side of the sealing head, the distance between the sealing head and the valve core seat in the axial direction of the valve core seat is relatively small compared with the distance between the magnet and the valve core seat in the axial direction of the valve core seat, and the overall size of the valve core assembly in the axial direction is relatively small compared with the prior art, so that when the elastic sealing unit is deflected under the action of turbulent airflow, the deflection amplitude of the sealing head and the magnet is basically consistent and relatively small compared with the prior art, effectively reducing the deflection amplitude of the valve core assembly during operation; at the same time, since the sealing head and the magnet are both arranged on the same side of the elastic sealing unit, the axial distance between the sealing head and the outer ring of the elastic sealing unit and the axial distance between the magnet and the outer ring of the elastic sealing unit do not change with the axial movement of the valve core seat when the valve core seat moves in the axial direction, so that the operation of the valve core assembly is more stable; furthermore, this arrangement makes the structure of the valve core assembly more compact, effectively reduces the demand of the valve core assembly for installation space, and facilitates the miniaturization of the gas proportional valve to which the valve core assembly is applied.

[0014] In one embodiment, a mounting cavity is coaxially arranged in the inner side of the first end of the valve core seat, and the magnet is arranged in the mounting cavity;

[0015] And / or, an annular mounting groove is arranged in the outer side wall of the first end of the valve core seat, the sealing head is arranged in the mounting groove, and the sealing head has a sealing surface exposed to the mounting groove.

[0016] In one of the embodiments, the valve core seat comprises a detachable sealing seat and a diaphragm seat, the sealing head is arranged on the sealing seat, and the sealing seat and the diaphragm seat jointly form the installation cavity, and the magnet clamp is arranged between the diaphragm seat and the sealing seat.

[0017] In one of the embodiments, the sealing seat has an installation groove with an opening facing the diaphragm seat, the first end of the diaphragm seat is installed in the installation groove, and the magnet clamp is arranged between the groove bottom of the installation groove and the first end face of the diaphragm seat.

[0018] In one of the embodiments, the first end outer wall of the diaphragm seat is provided with external threads, the groove wall of the installation groove is provided with internal threads, and the external threads and the internal threads are screwed together.

[0019] In one of the embodiments, the elastic sealing unit comprises coaxially and spaced main diaphragm and auxiliary diaphragm, the diaphragm stress area of the main diaphragm is greater than that of the auxiliary diaphragm.

[0020] The sealing seat comprises an inner seat part and an outer seat part connected in the axial direction, the inner seat part is installed in the installation groove, the outer seat part is located outside the installation groove and has an outer diameter greater than that of the inner seat part, the main diaphragm is coaxially sleeved outside the outer seat part, and the inner ring of the auxiliary diaphragm is clamped between the outer seat part and the sealing seat.

[0021] In one of the embodiments, the auxiliary diaphragm comprises an auxiliary inner ring part, an auxiliary transition part, an auxiliary deformation part and an auxiliary sealing part which are coaxially and sequentially connected from inside to outside, and the thicknesses of the auxiliary inner ring part, the auxiliary transition part and the auxiliary deformation part gradually decrease.

[0022] The end face of the outer seat part is provided with an annular groove, the auxiliary inner ring part is clamped between the groove bottom of the annular groove and the sealing seat, and the auxiliary transition part is clamped between the end face of the outer seat part and the sealing seat.

[0023] In one of the embodiments, the sealing seat comprises a main cylinder part, the inner cavity of the main cylinder part forms the installation groove and the opening end face abuts against the end part of the outer seat part.

[0024] The outer wall of the main cylinder part is provided with a first convex ring part and a second convex ring part, the second convex ring part is located between the first convex ring part and the outer seat part, the first convex ring part, the second convex ring part and the outer wall of the main cylinder part jointly form the installation groove, and the auxiliary diaphragm is sleeved outside the main cylinder part and clamped between the second convex ring part and the outer seat part.

[0025] In one of the embodiments, the valve core seat is provided with a gas flow channel penetrating through two ends, and the gas flow channel is located at the inner side of the magnet and the sealing head;

[0026] And / or, the elastic sealing unit comprises coaxially and spaced main diaphragm and auxiliary diaphragm, the main diaphragm is sleeved on the second end of the valve core seat, and the auxiliary diaphragm is located between the sealing head and the main diaphragm, and the diaphragm stress area of the main diaphragm is greater than that of the auxiliary diaphragm.

[0027] The second technical problem is solved by the following technical scheme:

[0028] A gas proportional valve comprises:

[0029] A valve seat comprises an air inlet channel, a valve cavity and an air outlet channel which are sequentially communicated along the gas flow direction, and the valve cavity has a valve port;

[0030] The valve core assembly as above is installed in the valve cavity, and the sealing head is arranged at the valve port in an axially movable manner, the elastic sealing unit is located at one end of the valve core seat away from the valve port, the outer ring of the elastic sealing unit is in sealing connection with the valve seat and separates the valve cavity into a flow cavity and a pressure stabilization cavity in an axial direction, the valve port is located in the flow cavity, and the air inlet channel is always communicated with the pressure stabilization cavity;

[0031] An electromagnetic assembly is installed outside the valve seat and is arranged in axial opposition with the first end of the valve core seat, and the electromagnetic assembly is used to drive the valve core assembly to move away from the electromagnetic assembly when energized, so that the sealing head opens the valve port, and the air inlet channel is communicated with the air outlet channel through the valve port;

[0032] An elastic member is installed in the valve seat and always applies an elastic force to the valve core assembly towards the electromagnetic assembly, so that the sealing head is kept or returned to the position of closing the valve port.

[0033] Compared with the background art, the gas proportional valve has the beneficial effects that: the opening and closing of the valve port and the opening degree adjustment are realized by the valve core assembly, the stability of the valve core assembly during work is improved, the pressure stabilization and flow stabilization effects of the gas valve are improved, the probability of air vibration of the gas proportional valve is reduced, and the use reliability and use experience of the gas proportional valve are improved.

[0034] In one of the embodiments, the valve seat is provided with the air outlet channel at one end close to the electromagnetic assembly, the flow cavity comprises coaxially communicated first cavity and second cavity, the connection of the first cavity and the second cavity forms the valve port, and the second cavity is located between the elastic sealing unit and the first cavity and communicates with the air outlet channel.

[0035] The valve core seat or the valve seat is provided with the air flow channel communicating the pressure stabilizing cavity and the first cavity, and the air inlet channel directly communicates with the first cavity or the pressure stabilizing cavity.

[0036] In one of the embodiments, the valve seat is provided with the air inlet channel at one end away from the electromagnetic assembly, and the valve core seat is provided with the air flow channel, and the air inlet channel is coaxially arranged with the air flow channel.

[0037] Or, the valve seat is provided with the air inlet channel at one end close to the electromagnetic assembly, the air inlet channel communicates with the first cavity, the valve core seat is provided with the air flow channel, and the air flow channel communicates the pressure stabilizing cavity and the first cavity.

[0038] Or, the valve seat is provided with the air inlet channel at one end close to the electromagnetic assembly, the valve seat is provided with the air flow channel outside the valve cavity, the air flow channel communicates the air inlet channel and the pressure stabilizing cavity, and the cross-sectional area of the air flow channel is smaller than that of the air inlet channel. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 The structure sectional view of the gas proportional valve in the closed valve state is provided for the embodiment one of the utility model;

[0040] Figure 2 The structure sectional view of the gas proportional valve in the open valve state is provided for the embodiment one of the utility model;

[0041] Figure 3 The split structure schematic view of the valve core assembly is provided for the embodiment one of the utility model;

[0042] Figure 4 The sectional view of the valve core assembly is provided for the embodiment one of the utility model;

[0043] Figure 5 The split structure schematic view of the valve core assembly is provided for the embodiment one of the utility model;

[0044] Figure 6 The structure sectional view of the gas proportional valve in the open valve state is provided for the embodiment two of the utility model;

[0045] Figure 7The utility model discloses a structure section view of gas proportional valve in the open valve state for the second embodiment.

[0046] Label explanation:

[0047] 100, valve core assembly, 200, valve seat, 201, first seat body, 2011, flow cavity, 20111, first cavity part, 20112, second cavity part, 20113, valve port, 2012, gas outlet channel, 202, second seat body, 2021, seat body part, 2022, gas inlet pipe part, 2023, pressure stabilizing cavity, 2024, sealing groove, 203, intermediate seat, 2031, mounting cylinder part, 2032, positioning ring part, 204, gas inlet channel, 300, electromagnetic assembly, 400, elastic piece, 500, gas flow channel,

[0048] 1, valve core seat, 11, sealing seat, 111, main cylinder part, 1111, first gas flow hole, 1112, mounting groove, 112, first convex ring part, 113, second convex ring part, 12, diaphragm seat, 121, inner seat part, 1211, mounting part, 1212, pressure receiving part, 122, outer seat part, 1221, outer cylinder part, 1222, pressure receiving ring part, 1223, mounting ring part, 123, second gas flow hole,

[0049] 2, sealing head, 21, sealing surface,

[0050] 3, magnet,

[0051] 4, elastic sealing unit, 41, main diaphragm, 411, main inner ring part, 412, main deformation part, 413, main sealing part, 42, auxiliary diaphragm, 421, auxiliary inner ring part, 422, auxiliary deformation part, 423, auxiliary sealing part, 424, auxiliary transition part. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0053] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application.

[0054] The terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are only used for descriptive purposes and are not to be construed as indicating or implying relative importance or a specific number of technical features indicated. Thus, features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified and limited.

[0055] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0056] Embodiment one

[0057] As shown in Figure 1 and Figure 2 The present embodiment provides a valve core assembly 100 and a gas proportional valve comprising the valve core assembly 100, so as to reduce the amplitude of the valve core assembly 100 caused by flow fluctuation, turbulent flow and the like, improve the pressure regulating and flow stabilizing effect of the gas proportional valve, and improve the use experience of the gas proportional valve.

[0058] Specifically, the gas proportional valve comprises a valve seat 200, an electromagnetic assembly 300, a valve core assembly 100 and an elastic member 400. The valve seat 200 has a valve cavity, an inlet passage 204 communicating with the valve cavity and an outlet passage 2012 communicating with the valve cavity, the inlet passage 204, the valve cavity and the outlet passage 2012 are sequentially communicated along the flow direction of the gas flow, and the valve cavity is provided with a valve port 20113; the valve core assembly 100 is movably mounted in the valve cavity in the axial direction thereof to open or close the valve port 20113; the electromagnetic assembly 300 is mounted on one side of the valve seat 200 close to the valve port 20113, and the electromagnetic assembly 300 after being energized drives the valve core assembly 100 to move in the direction away from the electromagnetic assembly 300 to open the valve port 20113; the elastic member 400 applies an elastic force to the valve core assembly 100 to drive the valve core assembly 100 to move towards the electromagnetic assembly 300, so that after the electromagnetic assembly 300 is de-energized, the valve core assembly 100 remains or returns to the valve closing position of closing the valve port 20113.

[0059] The valve core assembly 100 comprises a valve core seat 1, a sealing head 2, a magnet 3 and an elastic sealing unit 4. The sealing head 2 is coaxially sleeved on the outer side of the valve core seat 1; the magnet 3 is coaxially installed on the valve core seat 1 and at least partially located on the inner side of the sealing head 2; and the elastic sealing unit 4 is coaxially and sealingly sleeved on the outer side of the valve core seat 1, and the sealing head 2 and the magnet 3 are located on the same side of the elastic sealing unit 4, and the elastic sealing unit 4 can be deformed under pressure to apply an axial force to the valve core seat 1.

[0060] The sealing head 2 is movably arranged on the valve port 20113 in the axial direction to open or close the valve port 20113; the elastic sealing unit 4 is located at one end of the valve core seat 1 away from the valve port 20113, and the outer ring of the elastic sealing unit 4 is sealingly connected with the valve seat 200 and separates the valve cavity into a flow cavity 2011 and a pressure stabilizing cavity 2023 in the axial direction, and the valve port 20113 is located in the flow cavity 2011, and the inlet channel 204 is always in communication with the pressure stabilizing cavity 2023. The electromagnetic assembly 300 is arranged opposite to the first end of the valve core seat 1 in the axial direction of the valve core seat 1.

[0061] The valve core assembly 100 provided by the embodiment has the advantages that since the sealing head 2 and the magnet 3 are both installed on the same side of the elastic sealing unit 4, and the magnet 3 is at least partially located in the sealing head 2, the distance between the sealing head 2 and the valve core seat 1 in the axial direction of the valve core seat 1 is relatively small compared with the distance between the magnet 3 and the valve core seat 1 in the axial direction of the valve core seat 1, and the overall size of the valve core assembly 100 in the axial direction is relatively small compared with the prior art, so that when the elastic sealing unit 4 is deflected under the action of turbulent airflow, the deflection amplitudes of the sealing head 2 and the magnet 3 are basically consistent and relatively small compared with the prior art, and the deflection amplitude of the valve core assembly 100 during operation is effectively reduced; since the sealing head 2 and the magnet 3 are both installed on the same side of the elastic sealing unit 4, the axial distance between the sealing head 2 and the outer ring of the elastic sealing unit 4 and the axial distance between the magnet 3 and the outer ring of the elastic sealing unit 4 do not change with the axial movement of the valve core seat 1, so that the operation of the valve core assembly 100 is more stable; in addition, the structure of the valve core assembly 100 is more compact, the demand of the valve core assembly 100 for installation space is effectively reduced, and the miniaturization of the gas proportional valve to which the valve core assembly 100 is applied is facilitated.

[0062] The gas proportional valve provided by the embodiment can realize the opening and closing and opening degree adjustment of the valve port 20113 by adopting the valve core assembly 100, can improve the stability of the valve core assembly 100 during operation, can improve the pressure stabilizing and flow stabilizing effect of the gas proportional valve, can reduce the probability of air vibration of the gas proportional valve, and can improve the use reliability and use experience of the gas proportional valve.

[0063] To improve the compactness of the valve core assembly 100, the sealing head 2 is sleeved outside the first end of the valve core seat 1, and the elastic sealing unit 2 is arranged close to the second end of the valve core seat 1.

[0064] To further improve the use reliability of the gas proportional valve, in an embodiment, the elastic sealing unit 4 includes coaxially and spaced main diaphragm 41 and auxiliary diaphragm 42, the main diaphragm 41 is sleeved on the second end of the valve core seat 1 and the outer ring is sealingly connected with the valve seat 200; the auxiliary diaphragm 42 is sleeved on the valve core seat 1 and the outer end is sealingly connected with the valve seat 200, and the auxiliary diaphragm 42 is located between the sealing head 2 and the main diaphragm 41. The diaphragm stress area of the main diaphragm 41 is greater than the diaphragm stress area of the main diaphragm 41. And the side of the main diaphragm 41 away from the auxiliary diaphragm 42 forms a main stress surface, and the side of the auxiliary diaphragm 42 away from the auxiliary diaphragm 42 forms an auxiliary stress surface. That is, the gas flow pressure in the overflow cavity 2011 acts on the auxiliary stress surface of the auxiliary diaphragm 42, and the gas flow pressure of the stable pressure cavity 2023 acts on the main stress surface of the main diaphragm 41.

[0065] By setting the main diaphragm 41 and the auxiliary diaphragm 42, when the sealing head 2 opens the valve port 20113, part of the gas flow from the inlet gas passage 204 flows to the outlet gas passage 2012 through the overflow cavity 2011, and the gas pressure of this part of the gas flow acts on the auxiliary stress surface of the auxiliary diaphragm 42; another part of the gas flow enters the stable pressure cavity 2023 and acts on the main stress surface of the main diaphragm 41.

[0066] That is, when the valve core assembly 100 opens the valve port 20113, the moving part formed by the valve core seat 1, the sealing head 2 and the magnet 3 is subjected to the first action force F1 applied by the electromagnetic assembly 300 to the valve core assembly 100, and the first action force F is away from the electromagnetic assembly 300; the gas flow pressure of the gas flow acting on the main diaphragm 41 makes the main diaphragm 41 apply a second action force F2 to the moving part along the electromagnetic assembly 300, the gas flow pressure of the gas flow acting on the auxiliary diaphragm 42 makes the auxiliary diaphragm 42 apply a third action force F3 to the moving part away from the electromagnetic assembly 300, and the elastic member 400 applies a fourth action force F4 to the moving part towards the electromagnetic assembly 300.

[0067] When the intake flow of the intake passage 204 and the intake pressure stability, the valve core assembly 100 remains stable balance state, that is, F1+F3=F2+F4; when the intake pressure of the intake passage 204 increases, F2 and F3 increase at the same time, but due to the diaphragm force area of the main diaphragm 41 is larger than the diaphragm force area of the auxiliary diaphragm 42, thereby making the increase amplitude of F2 is greater than the increase amplitude of F3, that is, the moving part receives the force in the direction of the electromagnetic assembly 300 is greater than the force in the direction away from the electromagnetic assembly 300, prompting the moving part to move in the direction of the valve port 20113 to reduce the opening of the valve port 20113; at the same time, when the moving part moves in the direction of the valve port 20113, the elastic member 400 is elongated, so that F decreases, and finally reaches the stable state of F1+F3=F2+F4 again; similarly, when the intake pressure of the intake passage 204 decreases, the moving part moves away from the valve port 20113, thereby realizing dynamic balance and achieving pressure stabilization effect.

[0068] By setting the main diaphragm 41 and the auxiliary diaphragm 42, the main diaphragm 41 is separated from the flow cavity 2011 by the auxiliary diaphragm 42, thereby avoiding the airflow flowing in the flow cavity 2011 acting on the side of the main diaphragm 41 toward the valve port 20113, ensuring that the airflow pressure received by the main diaphragm 41 is always toward the valve port 20113, thereby ensuring the pressure stabilization effect of the valve core assembly 100; at the same time, by setting the auxiliary diaphragm 42 between the main diaphragm 41 and the sealing head 2, the valve core assembly 100 has two positions connected with the valve seat 200 in the axial direction, thereby further reducing the probability of large deviation of the valve core assembly 100 under the action of turbulence, reducing the deflection amplitude of the sealing head 2, and enhancing the running stability of the valve core assembly 100.

[0069] In other embodiments, only the main diaphragm 41 can be provided, and a sliding sealing structure is provided between the valve seat 200 and the valve core seat 1, and the sliding sealing structure is located between the sealing head 2 and the main diaphragm 41, so that the sliding sealing structure blocks the airflow in the flow cavity 2011 from acting on the side of the main diaphragm 41 toward the sealing head 2.

[0070] The sealing head 2 has a sealing surface 21 for cooperating with the valve port 20113. In an embodiment, the sealing surface 21 is a conical surface, the small end of the conical surface faces the electromagnetic assembly 300, and the large end faces the elastic sealing unit 4. The small end diameter of the conical surface is smaller than the diameter of the valve port 20113, and the large end diameter of the conical surface is larger than the diameter of the valve port 20113, thereby enabling the sealing head 2 to move within the valve port 20113, and through the cooperation of the conical surface with the sidewall of the valve port 20113, the valve port 20113 is blocked, and through the position of the conical surface relative to the valve port 20113, the actual opening of the valve port 20113 is adjusted, the convenience of opening adjustment is improved, and the requirements for the structure of the valve port 20113 are reduced. In other embodiments, the sealing surface 21 can be a planar structure.

[0071] In an embodiment, the valve seat 200 is provided with an air outlet passage 2012 at one end close to the electromagnetic assembly 300, the overflow cavity 2011 includes a coaxially communicated first cavity part 20111 and a second cavity part 20112, the connection of the first cavity part 20111 and the second cavity part 20112 forms a valve port 20113, the second cavity part 20112 is located between the elastic sealing unit 4 and the first cavity part 20111 and communicates with the air outlet passage 2012; the valve core seat 1 is provided with an air flow passage 500 communicating the pressure stabilizing cavity 2023 and the first cavity part 20111, the air flow passage 500 is located at the inner side of the sealing head 2 and the elastic sealing unit 4, and the air inlet passage 204 directly communicates with the first cavity part 20111 or the pressure stabilizing cavity 2023. By providing the air flow passage 500 on the valve core seat 1, the communication between the pressure stabilizing cavity 2023 and the first cavity part 20111 is facilitated, and the difficulty of setting the air flow passage 500 is reduced, and the structure of the valve seat 200 is simplified.

[0072] In other embodiments, the air flow passage 500 can also be provided on the valve seat 200, and the air flow passage 500 communicates the pressure stabilizing cavity 2023 and the first cavity part 20111, and the air inlet passage 204 communicates with the first cavity part 20111 or the pressure stabilizing cavity 2023.

[0073] In an embodiment, the valve seat 200 is provided with an air inlet passage 204 at one end away from the electromagnetic assembly 300, and the valve core seat 1 is provided with an air flow passage 500, and the air inlet passage 204 is coaxially arranged with the air flow passage 500. By providing the air inlet passage 204 at one end away from the electromagnetic assembly 300 of the valve seat 200, the setting convenience of the air inlet passage 204 is improved, the setting aperture of the air inlet passage 204 is ensured, and thus the air flow of the air inlet passage 204 is ensured. In other embodiments, the air inlet passage 204 can also be provided at one end close to the electromagnetic assembly 300 of the valve seat 200.

[0074] In an embodiment, the air flow passage 500 penetrates the center of the valve core seat 1, and the air flow passage 500 is located at the inner side of the magnet 3, thereby increasing the setting aperture of the air flow passage 500 and ensuring the air flow of the air flow passage 500 from the air inlet passage 204 to the first cavity part 20111. In other embodiments, the air flow passage 500 can also be located between the sealing head 2 and the magnet 3.

[0075] As Figure 2 and Figure 3As shown, in order to improve the installation convenience of the valve core assembly 100 on the valve seat 200, the valve seat 200 comprises a first seat body 201, an intermediate seat 203 and a second seat body 202 which are detachably connected along the axial direction of the valve core assembly 100, the electromagnetic assembly 300 is installed on the side of the first seat body 201 away from the intermediate seat 203, the outer ring of the auxiliary diaphragm 42 is clamped between the first seat body 201 and the intermediate seat 203, the outer ring of the main diaphragm 41 is clamped between the intermediate seat 203 and the second seat body 202, the first seat body 201 is provided with a gas outlet passage 2012 and a valve port 20113, the gas inlet passage 204 is provided on the first seat body 201 or the second seat body 202, and the first seat body 201, the intermediate seat 203 and the second seat body 202 jointly form a valve cavity.

[0076] By arranging the valve seat 200 into the detachably connected first seat body 201, intermediate seat 203 and second seat body 202, the installation and clamping of the main diaphragm 41 and the auxiliary diaphragm 42 between the adjacent two seat bodies are facilitated, thereby improving the installation and dismounting convenience of the valve core assembly 100 on the valve seat 200 and ensuring the installation stability of the valve core assembly 100 on the valve seat 200; at the same time, the outer ring of the auxiliary diaphragm 42 is clamped between the intermediate seat 203 and the first seat body 201, thereby simultaneously sealing the connection between the intermediate seat 203 and the first seat body 201, and the outer ring of the main diaphragm 41 simultaneously seals the connection between the intermediate seat 203 and the second seat body 202, thereby avoiding the leakage of the airflow in the valve cavity to the outside through the gap between the adjacent two seat bodies.

[0077] Further, the main diaphragm 41 comprises a main inner ring portion 411, a main deformation portion 412 and a main sealing portion 413 which are coaxially connected in sequence from inside to outside, the thickness of the main deformation portion 412 is smaller than the thickness of the main sealing portion 413 and the main inner ring portion 411, the main inner ring portion 411 is sealingly sleeved on the valve core seat 1, and the main sealing portion 413 is clamped between the intermediate seat 203 and the second seat body 202. The main deformation portion 412 is located outside the installation ring groove and has an arc-shaped ring structure with the opening away from the auxiliary diaphragm 42.

[0078] The auxiliary diaphragm 42 comprises an auxiliary inner ring portion 421, an auxiliary deformation portion 422 and an auxiliary sealing portion 423 which are coaxially connected in sequence from inside to outside, the auxiliary inner ring portion 421 is sealingly sleeved on the valve core seat 1, the auxiliary deformation portion 422 can be deformed under the action of the airflow pressure to generate a force for driving the valve core seat 1 to move, and the auxiliary sealing portion 423 is clamped between the first seat body 201 and the intermediate seat 203. The auxiliary deformation portion 422 has an arc-shaped ring structure with the opening away from the main diaphragm 41.

[0079] It is worth noting that the diaphragm stress area of the main diaphragm 41 refers to the area of the circle corresponding to the maximum protruding position of the main deformation portion 412 of the main diaphragm 41, and the diaphragm stress area of the auxiliary diaphragm refers to the area of the circle corresponding to the maximum protruding position of the auxiliary deformation portion 422 of the auxiliary diaphragm.

[0080] In an embodiment, the first seat body 201 is provided with a flow cavity 2011 at one end surface of the first seat body 201 facing the intermediate seat 203, the second cavity portion 20112 has a diameter larger than that of the first cavity portion 20111, and a connection between the second cavity portion 20112 and the first cavity portion 20111 forms a valve port 20113. The first seat body 201 is provided with a gas outlet channel 2012 at one side thereof communicating with the second cavity portion 20112. The intermediate seat 203 has a ring structure, and the second seat body 202 is provided with a pressure stabilizing cavity 2023 at a first end thereof facing the first seat body 201, and the flow cavity 2011, the pressure stabilizing cavity 2023 and an inner cavity of the intermediate seat 203 together form a valve cavity.

[0081] The first end of the valve core seat 1 and the sealing head 2 are located in the flow cavity 2011, the second end of the valve core seat 1 and the main diaphragm 41 are located in the pressure stabilizing cavity 2023, one end of the elastic member 400 abuts against a side of the valve core seat 1 away from the electromagnetic assembly 300, and the second end of the elastic member 400 abuts against a cavity bottom of the pressure stabilizing cavity 2023, so as to always apply an elastic force to the valve core seat 1 in a direction towards the valve port 20113, so as to ensure that the sealing head 2 can tightly block the valve port 20113 when the electromagnetic assembly 300 is not powered.

[0082] In an embodiment, the intermediate seat 203 comprises a mounting cylinder portion 2031, and a positioning ring portion 2032 is outwardly protruded from an inner wall of the mounting cylinder portion 2031, the auxiliary sealing portion 423 is clamped between the positioning ring portion 2032 and the first seat body 201, and the main sealing portion 413 is clamped between an end surface of the mounting cylinder portion 2031 and the second seat body 202, so that an outer diameter of the auxiliary sealing portion 423 is smaller than an outer diameter of the main sealing portion 413, thereby facilitating to ensure that a diaphragm stress area of the main diaphragm 41 is larger than a diaphragm stress area of the auxiliary diaphragm 42.

[0083] The second seat body 202 comprises a seat body portion 2021 and a gas inlet pipe portion 2022 which are arranged in sequence along an axial direction of the valve core assembly 100, the gas inlet pipe portion 2022 is located at a side of the seat body portion 2021 away from the intermediate seat 203, the seat body portion 2021 is provided with the pressure stabilizing cavity 2023, and the main diaphragm 41 is clamped between the seat body portion 2021 and the intermediate seat 203, and an inner cavity of the gas inlet pipe portion 2022 forms a gas inlet channel 204.

[0084] In order to further improve the installation convenience of the main diaphragm 41, an sealing groove 2024 is formed at an end surface of the seat body portion 2021, and the main sealing portion 413 is arranged between a groove wall of the sealing groove 2024 and an end surface of the intermediate seat 203, so as to prevent the main sealing portion 413 from being disengaged from a cooperation position and ensure the sealing reliability of the main sealing portion 413 between the second seat body 202 and the intermediate seat 203.

[0085] As shown in FIG. 1, the valve core assembly 100 comprises a first seat body 201, a second seat body 202, an intermediate seat 203, an electromagnetic assembly 300 and a valve core 400. Figure 4 and Figure 5As shown, in order to improve the installation convenience of the sealing head 2 on the valve core seat 1, an annular installation groove is formed on the outer wall of the first end of the valve core seat 1, the sealing head 2 is installed in the installation groove, and the sealing surface 21 is exposed to the installation groove.

[0086] Specifically, the installation groove has a first groove wall and a second groove wall opposite in the axial direction of the sealing head 2, the first groove wall is located on the side away from the elastic sealing unit 4 of the second groove wall, the small end of the sealing surface 21 faces the first groove wall, and the outer diameter of the small end of the conical surface is greater than or equal to the outer diameter of the first groove wall, and the outer diameter of the large end of the conical surface is less than or equal to the outer diameter of the large end of the second groove wall. Thereby, the valve core seat 1 can avoid blocking the sealing surface 21, and the installation reliability of the sealing head 2 on the valve core seat 1 can be effectively ensured.

[0087] In other embodiments, the first end of the valve core seat 1 can be provided with an installation protruding ring, an annular groove is formed on the inner wall of the sealing head 2, and the installation protruding ring is inserted into the annular groove in an interference fit to achieve the installation of the sealing head 2 on the valve core seat 1.

[0088] In order to improve the installation convenience of the magnet 3, the valve core seat 1 has an installation cavity inside, the installation cavity is coaxially arranged with the sealing head 2, and the magnet 3 is installed in the installation cavity. By providing the installation cavity, the installation and positioning of the magnet 3 inside the valve core seat 1 can be facilitated. Further, the magnet 3 has a ring structure, and the inner hole of the magnet 3 is in communication with the gas flow channel 500, which helps to ensure that the acting force between the magnet 3 and the electromagnetic assembly 300 is consistent in the circumferential direction of the valve core seat 1, ensures the reliability of the valve core assembly 100 moving in the first direction, and also avoids the influence of the magnet 3 on the gas flow in the gas flow channel 500.

[0089] The installation cavity has two limiting cavity walls arranged opposite and spaced apart in the axial direction, and the magnet 3 is clamped between the two limiting cavity walls to prevent the magnet 3 from moving axially relative to the valve core seat 1. The cavity diameter of the installation cavity is the same as the outer diameter of the magnet 3 to limit the movement of the magnet 3 in the radial direction of the valve core seat 1.

[0090] In an embodiment, the valve core seat 1 includes a sealing seat 11 and a diaphragm seat 12 arranged separately, the sealing seat 11 and the diaphragm seat 12 jointly form the installation cavity, the magnet 3 is clamped between the sealing seat 11 and the diaphragm seat 12, and the sealing head 2 is sleeved on the sealing seat 11. By providing the sealing seat 11 and the diaphragm seat 12 which can be detachably connected, the installation and disassembly convenience of the magnet 3 can be improved, and the processing cost of the valve core seat 1 can be reduced.

[0091] Further, the sealing seat 11 and the diaphragm seat 12 are coaxially arranged, the center of the sealing seat 11 is provided with a first gas flow hole 1111 in the axial direction, the center of the diaphragm seat 12 is provided with a second gas flow hole 123 in the axial direction, and the first gas flow hole 1111 and the second gas flow hole 123 are in communication to form the gas flow channel 500.

[0092] In an embodiment, the sealing head 2 is mounted on the sealing seat 11, the main diaphragm 41 is mounted on the diaphragm seat 12, and the auxiliary diaphragm 42 is clamped between the sealing seat 11 and the diaphragm seat 12, so that the structure of the sealing seat 11 or the diaphragm seat 12 can be simplified, and the machining difficulty of the valve core seat 1 is further reduced. In other embodiments, the sealing head 2, the main diaphragm 41, or the auxiliary diaphragm 42 can be mounted on the sealing seat 11 or the diaphragm seat 12.

[0093] In order to improve the connection convenience of the sealing seat 11 and the diaphragm seat 12, the sealing seat 11 has a mounting groove 1112 opening towards the diaphragm seat 12; the first end of the diaphragm seat 12 is mounted in the mounting groove 1112, and the magnet 3 is clamped between the groove bottom of the mounting groove 1112 and the first end face of the diaphragm seat 12. The above-mentioned arrangement is beneficial to the installation and positioning of the sealing seat 11 and the diaphragm seat 12 through the cooperation of the diaphragm seat 12 and the mounting groove 1112, and improves the assembly efficiency and assembly reliability. Further, the groove bottom of the mounting groove 1112 is provided with a first airflow hole 1111.

[0094] The diaphragm seat 12 has an inner seat portion 121 and an outer seat portion 122 connected in the axial direction, and the outer diameter of the outer seat portion 122 is greater than that of the inner seat portion 121. The inner seat portion 121 is located in the mounting groove 1112, and the end face of the inner seat portion 121 is spaced apart from the groove bottom of the mounting groove 1112 to cooperatively form a mounting cavity, i.e., the magnet 3 is clamped between the groove bottom of the mounting groove 1112 and the end face of the inner seat portion 121. The elastic sealing unit 4 is mounted on the outer seat portion 122 and / or between the outer seat portion 122 and the sealing seat 11.

[0095] In an embodiment, the main diaphragm 41 is coaxially sleeved on one end of the outer seat portion 122 away from the sealing seat 11, and the inner ring of the auxiliary diaphragm 42 is clamped between the outer seat portion 122 and the sealing seat 11. Thus, it is beneficial to achieve clamping and installation of the auxiliary diaphragm 42, reduce the installation difficulty of the auxiliary diaphragm 42, and improve the installation effect of the auxiliary diaphragm 42; at the same time, sleeving the main diaphragm 41 on the outer seat portion 122 is beneficial to reduce the structural interference between the main diaphragm 41 and the auxiliary diaphragm 42.

[0096] Further, a positioning step surface towards the sealing seat 11 is formed at the connection between the inner seat portion 121 and the outer seat portion 122, the end of the sealing seat 11 abuts on the positioning step surface, and the auxiliary diaphragm 42 is clamped between the positioning step surface and the sealing seat 11. Through the abutment of the sealing seat 11 and the positioning step surface, it is beneficial to achieve the installation positioning and limiting of the sealing seat 11 and the diaphragm seat 12 in the axial direction, and prevent the auxiliary diaphragm 42 from being damaged due to excessive extrusion of the sealing seat 11 on the auxiliary diaphragm 42 during assembly. In other embodiments, the end of the sealing seat 11 can also not abut on the end of the outer seat portion 122.

[0097] In an embodiment, the outer side wall of the first end of the diaphragm seat 12 is provided with external threads, the slot wall of the mounting slot 1112 is provided with internal threads, and the inner seat portion 121 and the outer seat portion 122 are threadedly screwed together, thereby improving the assembly convenience and stability of the sealing seat 11 and the inner seat portion 121. Specifically, the outer side wall of the inner seat portion 121 is provided with external threads. In another embodiment, the inner seat portion 121 and the sealing seat 11 can also be connected by screws, clamps or other connection methods that can keep the two stably connected.

[0098] The inner seat portion 121 includes a mounting portion 1211 and a pressing portion 1212 coaxially connected, the outer diameter of the mounting portion 1211 is larger than that of the pressing portion 1212, and the mounting portion 1211 is connected between the pressing portion 1212 and the outer seat portion 122. The magnet 3 is pressed between the pressing portion 1212 and the slot wall of the mounting slot 1112. Further, the outer side wall of the mounting portion 1211 is provided with internal threads.

[0099] In an embodiment, the sealing seat 11 includes a main cylinder portion 111, the inner cavity of the main cylinder portion 111 forms the mounting slot 1112, and the opening end of the main cylinder portion 111 faces the outer seat portion 122 and the end face abuts against the outer seat portion 122. The outer side wall of the main cylinder portion 111 outwardly protrudes a first protruding ring portion 112 and a second protruding ring portion 113, the first protruding ring portion 112 and the second protruding ring portion 113 are spaced apart to form a mounting groove together with the main cylinder portion 111. The second protruding ring portion 113 is located between the first protruding ring portion 112 and the positioning step face, and the auxiliary diaphragm 42 is sleeved on the outer side of the main cylinder portion 111 and clamped between the second protruding ring portion 113 and the outer seat portion 122. The structure of the sealing seat 11 is beneficial to the structural arrangement of the mounting slot 1112 and the mounting groove, and at the same time, it is beneficial to the clamping of the auxiliary diaphragm 42. The cylinder bottom of the main cylinder portion 111 is provided with the first airflow hole 1111.

[0100] The outer diameter of the first protruding ring portion 112 is smaller than that of the second protruding ring portion 113, the outer diameter of the first protruding ring portion 112 is smaller than or equal to the small end outer diameter of the tapered sealing surface 21, and the outer diameter of the second protruding ring portion 113 is greater than or equal to the large end outer diameter of the tapered sealing surface 21. That is, the side of the first protruding ring portion 112 facing the second protruding ring portion 113 forms a first slot wall, and the side of the second protruding ring portion 113 facing the first protruding ring portion 112 forms a second slot wall. Further, the side of the first protruding ring portion 112 away from the second protruding ring portion 113 is coplanar with the cylinder bottom surface of the main cylinder portion 111, so as to simplify the overall structure of the sealing seat 11.

[0101] The auxiliary film piece 42 further comprises an auxiliary transition part 424 coaxially connected between the auxiliary inner ring part 421 and the auxiliary deformation part 422, and the material thicknesses of the auxiliary inner ring part 421, the auxiliary transition part 424 and the auxiliary deformation part 422 gradually decrease, so that the auxiliary inner ring part 421 is thicker to better ensure the installation stability of the auxiliary film piece 42, the auxiliary deformation part 422 is relatively thin to better ensure the deformation effect of the auxiliary deformation part 422, and the auxiliary transition part 424 can avoid the problem that the local thickness of the auxiliary film piece 42 suddenly changes too much to cause stress concentration at the connection between the auxiliary deformation part 422 and the auxiliary inner ring part 421 and thus the auxiliary film piece 42 is torn, thereby improving the use reliability of the auxiliary film piece 42.

[0102] The end surface of the outer seat part 122 is provided with an annular groove, the auxiliary inner ring part 421 is clamped between the groove bottom of the annular groove and the sealing seat 11, and the auxiliary transition part 424 is clamped between the end surface of the outer seat part 122 and the sealing seat 11. In this way, the clamping stability of the auxiliary film piece 42 between the sealing seat 11 and the diaphragm seat 12 can be improved, and the auxiliary film piece 42 can be effectively prevented from moving along the radial direction of the valve core seat 1, thereby ensuring the sealing performance at the connection between the sealing seat 11 and the diaphragm seat 12.

[0103] In an embodiment, the outer seat part 122 comprises an outer cylinder part 1221, the opening of the outer cylinder part 1221 faces away from the inner seat part 121, and the outer diameter of the outer cylinder part 1221 is greater than the outer diameter of the inner seat part 121, so that the bottom surface of the outer cylinder part 1221 forms a positioning step surface. The bottom surface of the outer cylinder part 1221 extends in the direction towards the sealing head 2 and is provided with a pressing ring part 1222. The pressing ring part 1222, the bottom of the outer cylinder part 1221 and the inner seat part 121 surround to form the annular groove.

[0104] One end of the elastic member 400 towards the electromagnetic assembly 300 abuts against the inner bottom of the outer cylinder part 1221 to provide positioning for the installation of the elastic member 400, and the additional space occupied by the elastic member 400 in the valve cavity can be reduced, thereby improving the overall compactness of the gas proportional valve.

[0105] The diaphragm seat 12 is provided with a mounting ring groove, and the main inner ring part 411 is mounted in the mounting ring groove to provide positioning for the installation of the main film piece 41, prevent the main film piece 41 from being pulled out of the valve core seat 1 along the axial direction of the valve core seat 1, and improve the setting stability of the main film piece 41. Specifically, the outer side wall of the outer cylinder part 1221 is provided with two mounting ring parts 1223, the two mounting ring parts 1223 are arranged in the axial direction of the valve core seat 1 and are spaced apart, the two mounting ring parts 1223 cooperate with the outer wall of the main cylinder part 111 to form the mounting ring groove, and the outer end of the mounting ring part 1223 abuts against the main deformation part 412 to limit the deformation amplitude of the main deformation part 412.

[0106] Embodiment Two

[0107] As Figure 6As shown, this embodiment provides a valve core assembly 100 and a gas proportional valve including the valve core assembly 100. The basic structure of the gas proportional valve provided in this embodiment is the same as that in the above embodiments, with only some differences in settings. This embodiment will not repeat the same content as the above embodiments.

[0108] In this embodiment, the intake channel 204 is disposed on the first seat 201 and is directly connected to the first cavity 20111. This simplifies the structure of the second seat 202, thereby reducing the overall axial size of the gas proportional valve in the valve core assembly 100 and improving the overall structural compactness of the gas proportional valve. The intake channel 204 and the outlet channel 2012 are preferably disposed on opposite sides of the valve cavity.

[0109] In the gas proportional valve provided in this embodiment, when the sealing head 2 opens the valve port 20113, the airflow entering from the air inlet channel 204 enters the first chamber 20111. Part of the airflow in the first chamber 20111 flows to the air outlet channel 2012 through the valve port 20113 and the second chamber 20112, and the air pressure of this part of the airflow acts on the auxiliary hand force-bearing surface of the auxiliary diaphragm 42; another part of the airflow enters the airflow channel 500 on the valve core seat 1, enters the pressure stabilizing chamber 2023, and acts on the main force-bearing surface of the main diaphragm 41.

[0110] Example 3

[0111] like Figure 7 As shown, this embodiment provides a valve core assembly 100 and a gas proportional valve including the valve core assembly 100. The basic structure of the gas proportional valve provided in this embodiment is the same as that in the above embodiments, with only some differences in settings. This embodiment will not repeat the same content as the above embodiments.

[0112] In this embodiment, the intake channel 204 is disposed on the first seat 201 and is directly connected to the first cavity 20111. This simplifies the structure of the second seat 202, thereby reducing the overall axial size of the gas proportional valve in the valve core assembly 100 and improving the overall structural compactness of the gas proportional valve. The intake channel 204 and the outlet channel 2012 are preferably disposed on opposite sides of the valve cavity.

[0113] In the embodiment, the valve seat 200 is provided with an airflow passage 500, which is in communication with the air inlet passage 204 and the pressure stabilizing cavity 2023. Thus, when the sealing head 2 opens the valve port 20113, part of the airflow from the air inlet passage 204 enters the first cavity portion 20111, and then flows to the air outlet passage 2012 through the valve port 20113 and the second cavity portion 20112, and the air pressure of the part of the airflow acts on the auxiliary force receiving surface of the auxiliary diaphragm 42; another part of the airflow enters the airflow passage 500 on the valve seat 200 and enters the pressure stabilizing cavity 2023 to act on the main force receiving surface of the main diaphragm 41.

[0114] In the embodiment, the upper end of the sealing seat 11 is provided with a first through hole, which is arranged opposite the through hole of the magnet 3 to enhance the action between the electromagnetic assembly 300 and the magnet 3. The upper end of the diaphragm seat 12 is closed, and the lower end is provided with a groove, so that the airflow cannot enter the pressure stabilizing cavity 2023 through the valve core seat 1, and the installation of the elastic member 400 through the groove is also facilitated.

[0115] Further, the cross-sectional area of the airflow passage 500 is smaller than that of the air inlet passage 204, so as to avoid that part of the airflow in the air inlet passage 204 enters the pressure stabilizing cavity 2023 through the airflow passage 500, and reduce the loss of the airflow flowing to the air outlet passage 2012 while achieving the pressure stabilizing effect.

[0116] Further, the airflow passage 500 includes a first passage portion and a second passage portion which are vertically communicated, the first passage portion extends to the second seat body 202 along the axial direction of the valve core assembly 100 from the passage wall of the air inlet passage 204, one end of the second passage portion is in communication with the first passage portion, and the other end of the second passage portion penetrates the cavity wall of the pressure stabilizing cavity 2023. That is, the first passage portion extends from the first seat body 201 to the second seat body 202.

[0117] In the specific content of the above specific embodiments, any combination of technical features can be combined without contradiction, and in order to make the description simple, not all possible combinations of the above technical features are described, but as long as the combination of the technical features does not exist contradiction, it should be considered as the scope of the description.

[0118] The specific content of the above specific embodiments only expresses several implementation manners of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the utility model. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A valve core assembly, characterized in that, include: Valve core seat (1); The sealing head (2) is coaxially sleeved on the outside of the valve core seat (1); A magnet (3) is coaxially mounted on the valve core seat (1) with the sealing head (2) and is at least partially located inside the sealing head (2); The elastic sealing unit (4) is coaxial and sealed on the outside of the valve core seat (1), and the sealing head (2) and the magnet (3) are located on the same side of the elastic sealing unit (4). The elastic sealing unit (4) can be deformed under pressure to apply a force along its axial direction to the valve core seat (1).

2. The valve core assembly according to claim 1, characterized in that, The valve core seat (1) has a coaxial mounting cavity inside, and the magnet (3) is installed in the mounting cavity; And / or, the outer side wall of the valve core seat (1) is provided with an annular mounting groove, the sealing head (2) is installed in the mounting groove, and the sealing head (2) has a sealing surface (21) exposed in the mounting groove.

3. The valve core assembly according to claim 2, characterized in that, The valve core seat (1) includes a detachably connected sealing seat (11) and a diaphragm seat (12). The sealing head (2) is sleeved on the sealing seat (11). The sealing seat (11) and the diaphragm seat (12) together form the mounting cavity. The magnet (3) is sandwiched between the diaphragm seat (12) and the sealing seat (11).

4. The valve core assembly according to claim 3, characterized in that, The sealing seat (11) has a mounting groove (1112) with an opening facing the diaphragm seat (12). The first end of the diaphragm seat (12) is installed in the mounting groove (1112), and the magnet (3) is sandwiched between the bottom of the mounting groove (1112) and the first end face of the diaphragm seat (12).

5. The valve core assembly according to claim 4, characterized in that, The outer wall of the first end of the diaphragm seat (12) is provided with an external thread, and the groove wall of the mounting groove (1112) is provided with an internal thread. The external thread and the internal thread are screwed together.

6. The valve core assembly according to claim 4, characterized in that, The elastic sealing unit (4) includes a main diaphragm (41) and an auxiliary diaphragm (42) arranged coaxially and spaced apart. The force-bearing area of ​​the main diaphragm (41) is greater than that of the auxiliary diaphragm (42). The sealing seat (11) includes an inner seat portion (121) and an outer seat portion (122) connected axially. The inner seat portion (121) is installed in the mounting groove (1112). The outer seat portion (122) is located outside the mounting groove (1112) and its outer diameter is larger than that of the inner seat portion (121). The main diaphragm (41) is coaxially sleeved on the outside of the outer seat portion (122). The inner ring of the auxiliary diaphragm (42) is sandwiched between the outer seat portion (122) and the sealing seat (11).

7. The valve core assembly according to claim 6, characterized in that, The auxiliary diaphragm (42) includes an auxiliary inner ring (421), an auxiliary transition (424), an auxiliary deformation (422) and an auxiliary sealing (423) that are coaxially connected from the inside to the outside. The thickness of the auxiliary inner ring (421), the auxiliary transition (424) and the auxiliary deformation (422) gradually decreases. The outer seat (122) has an annular groove on its end face. The auxiliary inner ring (421) is sandwiched between the bottom of the annular groove and the sealing seat (11). The auxiliary transition (424) is sandwiched between the end face of the outer seat (122) and the sealing seat (11).

8. The valve core assembly according to claim 6, characterized in that, The sealing seat (11) includes a main cylinder (111), the inner cavity of which forms the mounting groove (1112) and the opening end face abuts against the end of the outer seat (122); The outer wall of the main cylinder (111) is provided with a first protruding ring (112) and a second protruding ring (113). The second protruding ring (113) is located between the first protruding ring (112) and the outer seat (122). The first protruding ring (112), the second protruding ring (113) and the outer wall of the main cylinder (111) together form the mounting groove. The auxiliary diaphragm (42) is sleeved on the outside of the main cylinder (111) and sandwiched between the second protruding ring (113) and the outer seat (122).

9. The valve core assembly according to any one of claims 1-8, characterized in that, The valve core seat (1) has an airflow channel (500) that runs through both ends, and the airflow channel (500) is located inside the sealing head (2) and the elastic sealing unit (4); And / or, the elastic sealing unit (4) includes a main diaphragm (41) and an auxiliary diaphragm (42) that are coaxially arranged and spaced apart. The main diaphragm (41) is sleeved on the outer side of the second end of the valve core seat (1). The auxiliary diaphragm (42) is located between the sealing head (2) and the main diaphragm (41). The diaphragm force-bearing area of ​​the main diaphragm (41) is greater than the diaphragm force-bearing area of ​​the auxiliary diaphragm (42).

10. A gas proportional valve, characterized in that, include: A valve seat (200) includes an air inlet channel (204), a valve chamber, and an air outlet channel (2012) that are sequentially connected along the airflow direction, and the valve chamber has a valve port (20113). The valve core assembly as described in any one of claims 1-9, wherein the valve core assembly is installed in the valve cavity, and the sealing head (2) is axially movable at the valve port (20113), the elastic sealing unit (4) is located at one end of the valve core seat (1) away from the valve port (20113), the outer ring of the elastic sealing unit (4) is sealed to the valve seat (200) and axially divides the valve cavity into a flow chamber (2011) and a pressure regulating chamber (2023), the valve port (20113) is located in the flow chamber (2011), and the air intake passage (204) is always in communication with the pressure regulating chamber (2023); An electromagnetic component (300) is installed on the outside of the valve seat (200) and is arranged axially opposite to the first end of the valve core seat (1) on the valve core seat (1). The electromagnetic component (300) is used to drive the valve core assembly to move in a direction away from the electromagnetic component (300) when energized, so that the sealing head (2) opens the valve port (20113), thereby allowing the air inlet channel (204) to communicate with the air outlet channel (2012) through the valve port (20113). An elastic element (400) is installed in the valve seat (200) and always applies an elastic force toward the electromagnetic assembly to the valve core assembly so that the sealing head (2) is held or returned to the position of closing the valve port (20113).

11. The gas proportional valve according to claim 10, characterized in that, The valve seat (200) is provided with the air outlet channel (2012) at one end near the electromagnetic component (300). The flow chamber (2011) includes a first cavity (20111) and a second cavity (20112) that are coaxially connected. The valve port (20113) is formed at the connection between the first cavity (20111) and the second cavity (20112). The second cavity (20112) is located between the elastic sealing unit (4) and the first cavity (20111) and is connected to the air outlet channel (2012). The valve core seat (1) or the valve seat (200) is provided with an airflow channel (500) that connects the pressure stabilizing chamber (2023) and the first chamber (20111), and the air inlet channel (204) is directly connected to the first chamber (20111) or the pressure stabilizing chamber (2023).

12. The gas proportional valve according to claim 11, characterized in that, The valve seat (200) is provided with an air intake channel (204) at one end away from the electromagnetic component (300), and the valve core seat (1) is provided with an airflow channel (500). The air intake channel (204) and the airflow channel (500) are coaxially arranged. Alternatively, the valve seat (200) may have an air intake channel (204) at one end near the electromagnetic component (300), the air intake channel (204) being connected to the first cavity (20111), and the valve core seat (1) may have an airflow channel (500) being connected to the pressure stabilizing cavity (2023) and the first cavity (20111); Alternatively, the valve seat (200) may have an air intake channel (204) at one end near the electromagnetic component (300), and the valve seat (200) may have an airflow channel (500) on the outside of the valve cavity, the airflow channel (500) connecting the air intake channel (204) and the pressure stabilizing chamber (2023), and the cross-sectional area of ​​the airflow channel (500) being smaller than the cross-sectional area of ​​the air intake channel (204).

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