Gas valve

Abstract

An electromagnetic driving device is arranged to be of a two-section type and comprises a first valve element assembly and a second valve element assembly, a valve body is of an integrated structure and is provided with a first valve port part, a second valve port part and a third valve port part, a second sleeve is in sliding fit with a first sleeve, and a first valve plug can abut against or be away from the first valve port part; the second valve plug can abut against or be far away from the second valve port part, the flow limiting rod assembly is arranged to directly abut against the third valve port part or be far away from the third valve port part, through the design, arrangement of a rubber sealing piece is omitted, and the risk of part deformation in the actual application sealing process is greatly reduced; an originally designed rubber sealing piece structure for guaranteeing the sealing reliability is integrated into the electromagnetic driving device, the use safety is guaranteed through a valve port part all the time in the use process of the gas valve, and the use safety and reliability of the gas valve are relatively guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of gas control, and particularly relates to a gas valve. Background Art

[0002] According to the safety specification requirements of gas valves, the gas valve needs to include two independent safety valves, and one of the valves must be closed when the power is off to ensure the safety of gas use.

[0003] In a typical gas valve structure, it includes a valve body, an electromagnetic driving device, and a proportional regulating device. The valve body is provided with a first valve port part. The electromagnetic driving device includes a valve plug part, and the first valve plug part can abut against the first valve port part. The valve body is provided with a second valve port part. The proportional regulating device includes a current-limiting part, and a rubber seal is provided at the second valve port part or the current-limiting part to further ensure sealing. In actual market applications, the rubber seal often has the situation of aging and deformation. Summary of the Invention

[0004] The purpose of the present invention is to provide a gas valve with a new structure, which can be a gas valve with relatively high reliability in use.

[0005] The present invention provides a gas valve, which includes a valve body, an electromagnetic driving device, and a proportional regulating device. The valve body is an integral structure provided with a first valve port part and a second valve port part. The electromagnetic driving device includes a first sleeve, a magnetic attracting part, a first valve core assembly, and a second valve core assembly. The first sleeve is connected to the magnetic attracting part. The first valve core assembly includes a second sleeve, a first iron core, and a first valve plug. One end of the second sleeve is fixedly connected to the first iron core, and the other end is connected to the first valve plug. The first valve plug can abut against or move away from the first valve port part. The second valve core assembly includes a second iron core and a second valve plug connected to the second iron core. At least part of the second iron core is located inside the second sleeve. The second valve plug can abut against or move away from the second valve port part. A first elastic member is provided between the first iron core and the second iron core. The first iron core can be attracted to the second iron core and move towards the direction of the magnetic attracting part.

[0006] The valve body is provided with a third valve port part. The proportional regulating device includes a current-limiting rod assembly. The current-limiting rod assembly directly abuts against the third valve port part or the current-limiting rod assembly moves away from the third valve port part.

[0007] The present invention provides a gas valve. The electromagnetic driving device is configured as a two-stage type and includes a first valve core assembly and a second valve core assembly. The valve body is an integral structure provided with a first valve port, a second valve port, and a third valve port. The second sleeve is slidably engaged with the first sleeve. The first valve plug can abut against or move away from the first valve port, and the second valve plug can abut against or move away from the second valve port. The flow-limiting rod assembly is configured to directly abut against the third valve port or move away from the third valve port. Through the above design, the rubber seal is eliminated, greatly reducing the risk of component deformation during actual application sealing. The structure of the original rubber seal for ensuring sealing reliability is integrated into the electromagnetic driving device. During the use of the gas valve, there is always a valve port to ensure the use safety, relatively ensuring the use safety and reliability of the gas valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a cross-sectional schematic view of the electromagnetic driving device in an embodiment of the present invention;

[0009] Figure 2 It is a cross-sectional schematic view of the gas valve in the first embodiment of the present invention;

[0010] Figure 3 It is a cross-sectional schematic view of the gas valve in the second embodiment of the present invention;

[0011] Figure 4 It is a cross-sectional schematic view of the gas valve in the third embodiment of the present invention.

[0012] Wherein, Figures 1 to 4 in:

[0013] 1 valve body; 101 outlet cavity; 102 sealing ring; 104 filter screen; 105 inlet;

[0014] 2 electromagnetic driving device; 201 first magnetic conductor; 202 second elastic member; 203 coil component; 204 second magnetic conductor; 205 first iron core; 206 elastic buffer component; 207 static iron core; 208 second iron core; 209 sealing ring; 210 magnetic conducting bushing; 2101 tube body part; 2102 bent part; 211 first sleeve; 213 second sleeve; 212 third magnetic conductor; 214 first valve plug; 215 second valve plug; 216 first elastic member;

[0015] 3 proportional adjustment device; 301 valve closing spring; 302 flow-limiting member; 303 valve core component; 305 end cover; 306 magnetic conducting housing; 307 electromagnetic coil; 310 valve rod; 311 magnet seat; 312 magnet; 313 iron core; 320 diaphragm;

[0016] 314 pressure regulating device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] As described in the background art, the gas valve is provided with a first sealing valve and a second sealing valve. When closing the valve, the first sealing valve performs primary sealing through an electromagnetic driving device, and the second sealing valve performs secondary sealing through a proportional regulating device, thereby realizing two-stage sealing of the gas valve. The second sealing valve is usually in the form of a rubber valve. Under the conditions of long-term sealing and compression of the valve closing force, the rubber valve has a certain deformation, which causes instability of the outlet pressure of the valve body, and in severe cases, the equipment cannot operate normally.

[0018] Based on the above findings, the present application further studies and proposes a technical solution that can solve the above technical problems.

[0019] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the technology concisely, and does not indicate or imply that the device or element referred to must have a specific orientation, specific orientation structure and operation. Therefore, it should not be understood as a limitation to the present invention.

[0020] Hereinafter, terms such as "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined by "first", "second", etc. may explicitly or implicitly include one or more of such features.

[0021] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0022] Please refer to Figures 1 to 4 , Figure 1 which is a cross-sectional view schematic diagram of the electromagnetic driving device in an embodiment of the present invention; Figure 2 which is a cross-sectional view schematic diagram of the gas valve in the first embodiment of the present invention; Figure 3 which is a cross-sectional view schematic diagram of the gas valve in the second embodiment of the present invention; Figure 4 which is a cross-sectional view schematic diagram of the gas valve in the third embodiment of the present invention.

[0023] The present invention provides a gas valve, which includes a valve body 1, a first valve port part, a second valve port part 1a, a third valve port part 1b, an electromagnetic driving device 2, a proportional regulating device 3, and a pressure regulating device 314.

[0024] The interior of the valve body 1 has a gas flow channel. The valve body 1 also has an inlet 105 and an outlet. The inlet 105 and the outlet can be connected through the gas flow channel. The inner wall of the valve body 1 that forms the gas flow channel is provided with a second valve port part 1a and a third valve port part 1b. The electromagnetic driving device 2 is used to control the opening and closing of the second valve port of the second valve port part 1a, and the proportional regulating device 3 is used to control the opening and closing of the third valve port of the third valve port part 1b. When all the valve ports are in the open state, the inlet 105 and the outlet are connected through the gas flow channel.

[0025] The valve body 1 of the gas valve provided by the present invention is an integral structure. The electromagnetic driving device 2 includes a first sleeve 211, a magnetic attraction part, a first valve core assembly, and a second valve core assembly. The first sleeve 211 is connected to the magnetic attraction part. The first valve core assembly includes a second sleeve 213, a first iron core 205, and a first valve plug 214. One end of the second sleeve 213 is fixedly connected to the first iron core 205, and the other end is connected to the first valve plug 214. The second sleeve 213 is slidably matched with the first sleeve 211, and the first valve plug 214 can abut against or move away from the first valve port part; the second valve core assembly includes a second iron core 208 and a second valve plug 215 connected to the second iron core 208. At least part of the second iron core 208 is located in the second sleeve 211, and the second valve plug 215 can abut against or move away from the second valve port part 1a. A first elastic member 216 is provided between the first iron core 205 and the second iron core 208. The first iron core 205 can be attracted to the second iron core 208 and move in the direction of the magnetic attraction part.

[0026] The valve body is provided with a third valve port part 1b. The proportional regulating device includes a current-limiting rod assembly. The current-limiting rod assembly includes a valve core component 303. The valve core component 303 directly abuts against the third valve port part 1b or the valve core component 303 moves away from the third valve port part 1b.

[0027] The present invention provides a gas valve. The electromagnetic driving device 2 is arranged in a two-stage manner and includes a first valve core assembly and a second valve core assembly. The valve body 1 is an integral structure and is provided with a first valve port part, a second valve port part 1a, and a third valve port part 1b. The second sleeve 213 is slidably matched with the first sleeve 211. The first valve plug 214 can abut against or move away from the first valve port part. The second valve plug 215 can abut against or move away from the second valve port part 1b. The current-limiting rod assembly is arranged to directly abut against the third valve port part 1b or the current-limiting rod assembly moves away from the third valve port part 1b. By the above design, the setting of rubber seals is cancelled, greatly reducing the risk of component deformation during actual application sealing. The structure of the rubber seal in the original design to ensure sealing reliability is integrated into the electromagnetic driving device 2. During the use of the gas valve, there is always a valve port part to ensure the use safety, relatively ensuring the use safety and reliability of the gas valve.

[0028] Among them, the first spool assembly further includes a static iron core 207 and a second elastic member 202. The outer peripheral wall of the second sleeve 213 is circumferentially sealed with the fixed body and the second sleeve 213 can reciprocate axially relative to the fixed main body. That is to say, the second sleeve 213 is in sliding seal with the valve body 1, and the two can be directly sealed or sealed through a sealing component. The second elastic member 202 is press-fitted between the first valve plug 214 and the valve body 1.

[0029] In this application, the second spool assembly includes a second iron core 208, a first elastic member 216 and a second valve plug 215. One section of the second iron core 208 is slidably disposed in the inner hole of the second sleeve 213. The second iron core 208 may include a connected cylindrical shaft section and an extended shaft section. The diameter of the cylindrical shaft section is larger than that of the extended shaft section, and at least part of the outer peripheral wall of the cylindrical shaft section is in sealed sliding with the inner peripheral wall of the second sleeve 213. The second valve plug 215 is connected to the end of the extended shaft section. That is, the end of the second iron core 208 close to the second valve port is connected to the second valve plug 215, and the first elastic member 216 is axially telescoped and installed between the second iron core 208 and the first iron core 205.

[0030] The first valve plug 214 and the second valve plug 215 can be made of elastic materials with better sealing performance, such as rubber or silica gel, etc. They can cover the second sleeve 213 and the end of the second iron core 208. Of course, in order to improve the use stiffness of the first valve plug 214 and the second valve plug 215, the rubber parts can also be combined with metal parts to play a rigid support role. The second elastic member 202 and the first elastic member 216 can be springs or other elastic components.

[0031] In this application, the first valve port part and the second valve port part can respectively cooperate with the first valve plug 214 and the second valve plug 215 for circumferential sealing; the first valve port part is located outside the second valve port part.

[0032] When the electromagnetic driving device 2 is energized, the coil component 203 in the electromagnetic driving device 2 is energized and magnetized, and the first iron core 205 and the static iron core 207 generate an air-gap magnetic flux, causing the first iron core 205 and the static iron core 207 to generate mutual attraction. The first iron core 205 moves towards the static iron core 207. In this way, the first iron core 205 drives the first valve plug 214 to separate from the first valve port. Similarly, an air-gap magnetic flux will also be generated between the second iron core 208 and the static iron core 207, causing an attraction between the second iron core 208 and the static iron core 207. The second iron core 208 moves towards the static iron core 207, and then the second iron core 208 drives the second valve plug 215 to separate from the second valve port. The first valve plug 214 separates from the first valve port and the second valve plug 215 separates from the second valve port. In this way, the second valve port is in a communicating state; at this time, the second elastic member 202 and the first elastic member 216 are in a compressed state or a stretched state.

[0033] When the electromagnetic driving device 2 is powered off, the magnetic force disappears. Under the restoring force of the second elastic member 202, the first valve plug 214 can abut and seal against the first valve port portion. At the same time, under the restoring force of the first elastic member 216, the second valve plug 215 can abut and seal against the second valve port portion, and the second valve port is in a closed state. There is a first distance H1 between the first iron core 205 and the second iron core 208, and there is a second distance H2 axially between the first iron core 205 and the static iron core 207 of the fixed main body, and the first distance H1 is less than the second distance H2.

[0034] In this application, the second valve port portion 1a includes a first valve port portion and a second valve port portion, which can respectively cooperate with the first valve plug 214 and the second valve plug 215 to form a circumferential sealing structure, that is, the first valve plug 214 and the second valve plug 215 of the electromagnetic driving device 2 and the second valve port portion form two sealing structures. In this way, under the condition of meeting the sealing requirements of the gas valve, the sealing structure at the third valve port can be cancelled, and the basic functions of pressure regulation and pressure stabilization of the proportional regulating device 3 can be restored, reducing the influence of excessive functions on the functional core part, so as to achieve the purpose of providing product stability and reliability.

[0035] Among them, the elastic force of the second elastic member 202 can be greater than the elastic force of the first elastic member 216.

[0036] In this application, the first valve port portion and the second valve port portion may not be coplanar, and one of the first valve port portion and the second valve port portion protrudes axially toward the side of the electromagnetic driving device 2 relative to the other. The specific implementation manner in which the second valve port portion protrudes relative to the first valve port portion is shown in the drawings. Of course, the first valve port portion may also be closer to the side of the electromagnetic driving device 2 than the first valve port portion.

[0037] Compared with the case where the first valve port portion and the second valve port portion are located in the same plane, setting the two in different planes is more conducive to achieving reliable sealing between the first valve port portion and the first valve plug 214, and between the second valve port portion and the second valve plug 215.

[0038] The fixed main body of the electromagnetic driving device 2 may include one or several of the coil component 203, the first sleeve 211, the magnetic conductor, and the static iron core 207. The coil component 203 has an installation hole, and the first sleeve 211 is fixedly installed or limitedly installed inside the installation hole.

[0039] Specifically, the first valve plug 214 includes an axially extending through hole, and at least a part of the second iron core 208 passes through the through hole to fix the second valve plug 215. The surface of the first valve plug 214 that abuts and cooperates with the first valve port portion is generally an annular surface, and the abutting surface of the second valve plug 215 can be generally a plane.

[0040] In a specific embodiment, the through-hole includes a connected first hole section 2142 and a second hole section 2141. The diameter of the first hole section 2142 is larger than that of the second hole section 2141. The first hole section is close to one side of the second valve port 1a. The end face of the first valve plug 214 close to the first hole section abuts against the first valve port portion to achieve circumferential sealing. The second valve plug 215 is at least partially located in the first hole section, and the step surface between the first hole section and the first hole section can limit the maximum axial displacement of the second valve plug 215 outward.

[0041] The step surface between the first hole section and the second hole section can play a role in installing and positioning the second valve plug 215 and the second iron core 208.

[0042] In this application, the fixed body further includes a first sleeve 211. The coil component 203 can be installed and supported on the outer periphery of the first sleeve 211. The end of the first sleeve 211 facing the second valve port is the first open end. The second sleeve 213 is at least partially located in the inner cavity of the first sleeve 211 and can axially reciprocate along the inner peripheral wall of the first sleeve 211. A part of the second sleeve 213 extends out from the first open end of the first sleeve 211 to connect to the first valve plug 214.

[0043] The second sleeve 213 plays a role in guiding the movement of the first sleeve 211 to a certain extent, and the circumferential contact area between the second sleeve 213 and the first sleeve 211 is relatively large, which is beneficial to improving the stability of the reciprocating movement of the first iron core 205 and the second iron core 208.

[0044] The static iron core 207 is installed at the outer end of the first sleeve 211, and a sealing ring 209 can be used for further sealing.

[0045] As described above, the fixed body further includes a coil component 203 and a magnetic conductor. The coil component 203 has a mounting hole, and the first sleeve 211 is fixedly fitted in the mounting hole. The magnetic conductor includes a receiving cavity. The coil component 203 is located inside the receiving cavity. The end wall of the magnetic conductor close to the second valve port has a through-hole for the second sleeve 213 to pass through. As shown in the figure, the coil component 203 is installed in the receiving cavity surrounded by the magnetic conductor, and the second elastic member 202 is installed between the end wall of the magnetic conductor and the first valve plug 214.

[0046] As Figure 1 shown, the other end of the first sleeve 211 of the gas valve away from the second valve port is the second open end. The outer end wall of the magnetic conductor has an extension extending into the second open end and closing the second open end. The extension forms the static iron core 207, and a second distance is formed between the extension and the first moving magnet.

[0047] In this embodiment, the structure of the electromagnetic driving device 2 is relatively simple.

[0048] The magnetic conductor forms the housing of the electromagnetic driving device 2, and the structure of the magnetic conductor can have various forms. Figure 2 A specific structure is given in Figure 2 . The magnetic conductor may include a first magnetic conductor 201, a second magnetic conductor 204, and a third magnetic conductor 212. The second magnetic conductor 204 and the third magnetic conductor 212 can enclose to form a receiving cavity for mounting the coil component 203. The first magnetic conductor 201 is further mounted at the end near the second valve port to enhance the magnetic conduction function.

[0049] The electromagnetic driving device 2 is hermetically fixed to the valve body 1 through the magnetic conductor. A sealing ring 102 can be further installed between the magnetic conductor and the valve body 1 to achieve axial sealing.

[0050] Please refer to Figure 3 , in another embodiment, the other end of the first sleeve 211 away from the second valve port is the second open end. The fixed body further includes a magnetic conductive bushing 210. The magnetic conductive bushing 210 includes a tube body portion 2101 and a bent portion 2102. The tube body portion 2101 is located between the outer peripheral wall of the first sleeve 211 and the inner peripheral wall of the mounting hole, and the tube body portion 2101 sleeves at least a part of the outer peripheral wall of the first sleeve 211. The bent portion 2102 is located between the coil component 203 and the outer end wall of the magnetic conductor. The magnetic conductive bushing 210 can improve the overall magnetic conduction ability.

[0051] The magnetic conductive bushing 210 can be sleeved with the first sleeve 211 by interference fit or welding.

[0052] In order to minimize the noise of the gas valve, the static iron core 207 is installed at the second open end, and the static iron core 207 seals the outer end of the first sleeve 211. An elastic buffer member is installed between the static iron core 207 and the first iron core 205. One of the static iron core 207 and the first iron core 205 can be processed with a mounting groove, and the elastic buffer member is arranged in the mounting groove.

[0053] Please refer to again Figure 1 and Figure 2, The proportional adjustment device of the gas valve includes an electromagnetic coil, a magnet 312, a diaphragm 320, a limiting member 302, and a valve closing spring 301. The magnet 312, the diaphragm 320, and the limiting member 302 form a valve core component 303. The pressure regulating device 314 and the electromagnetic coil are both fixedly installed on the valve body. The electromagnetic coil may specifically include a coil 307, a magnetic conductive housing 306, and an iron core 313. The magnetic conductive housing 306 of the electromagnetic coil is fixed to the valve body 1. A aluminum alloy end cover 305 is provided on the valve body close to the diaphragm side. The proportional adjustment device is fixed to the outside of the aluminum alloy end cover 305, and the aluminum alloy end cover 305 is provided with a breathing hole. The electromagnetic coil 307 and the first magnetic conductive housing 306 are provided on the outside of the aluminum alloy end cover 305, and an iron core 301 is arranged at the center of the magnetic conductor and the electromagnetic coil. Changing the current direction applied to the electromagnetic coil can generate electromagnetic fields in different directions. The electromagnetic field of the coil is conducted to the iron core 313 through the first magnetic conductive housing 306. Since the positions of the iron core 313 and the magnet 312 are close and the magnetic poles are the same, according to the principle of like magnetic poles repelling each other, after the electromagnetic coil is energized and magnetized, it repels the magnet 312, causing the magnet 312 to push the valve core component 303 to move in the valve opening direction, opening the valve to adjust the gas flow. The opening size of the valve depends on the magnetic field strength generated by the coil. The greater the current, the greater the magnetic field thrust on the magnet 312 and the iron core 313. The current and the valve opening are in a proportional relationship.

[0054] Both the magnet 312 and the diaphragm 320 are installed at the first end of the valve core component 303. In this application, the magnet 312 is fixed to the magnet seat 311, and the magnet seat 311 is fixed to the limiting member 302. The outer edge of the diaphragm 320 is fixed to the valve body, and the valve closing spring 301 is elastically pressed between the second end of the limiting member 302 and the inner wall of the valve body opposite thereto. When the electromagnetic coil is energized, an electromagnetic force is generated between the electromagnetic coil and the magnet to push the valve core component away from the third valve port of the third valve port and compress the valve closing spring 301; when the electromagnetic coil is de-energized, under the restoring force of the valve closing spring 301, the valve core component 303 closes the third valve port.

[0055] The limiting member 302 may be of a hollow structure, and a valve rod 310 is fixed inside it to increase strength. Of course, the structure of the limiting member 302 is not limited to what is described in this article and may also be in other forms.

[0056] The pressure regulating device is used to set the outlet pressure of the valve body.

[0057] Please refer to Figure 3, in another specific embodiment, the proportional adjustment device includes an electromagnetic coil, a moving iron core, a magnetic conductive housing 306, a limiting member, a diaphragm, and a valve closing spring. A diaphragm is fixed to one end of the limiting member away from the third valve port. The outer edge of the diaphragm 320 is fixedly connected to the valve body. A valve closing spring is press-fitted between the other end of the limiting member and the inner wall of the valve body. The magnetic conductive housing includes a circumferential portion and end wall portions connected to both ends of the circumferential portion. The circumferential portion and the two end wall portions form a cavity for accommodating the electromagnetic coil. There is a gap between the moving iron core and the end wall of the magnetic conductive housing close to the third valve port. Under the action of the electromagnetic force generated by the electromagnetic coil, the moving iron core can reciprocate along the inner hole of the electromagnetic coil in the axial direction of the third valve port to drive the limiting member to open the third valve port.

[0058] Among them, the current-limiting member 302 is connected and fixed to components such as the diaphragm 320 and the spring seat 304 to form a valve core component 303. An aluminum alloy end cover 305 and a magnetic conductor 306 are provided outside the diaphragm 320. Both the aluminum alloy end cover 305 and the magnetic conductor 306 can be locked and fixed to the valve body 1. An electromagnetic coil 307, a sleeve 310, a moving iron core 308, etc. are provided inside the magnetic conductive housing 306. The moving iron core 308 moves axially inside the sleeve. The moving iron core 308 abuts against the current-limiting member 302 above. A spring and a pressure regulating device 309 are provided below the moving iron core 308. The initial outlet pressure of the valve body is set through the pressure regulating device 309. The magnetic conductive housing 306 below the moving iron core conducts the magnetic field radially to the moving iron core. An annular magnetic circuit is formed through the gap between the moving iron core 308 above and the magnetic conductive housing 306. After the electromagnetic coil is energized, the moving iron core 308 is attracted upward by the magnetic flux through the gap between the moving iron core 308 above and the magnetic conductive housing 306, so that the moving iron core 308 pushes the current-limiting member 302 to open the valve for gas flow regulation. The opening size of the third valve port depends on the magnetic field size generated by the electromagnetic coil, that is, the current size passing through the electromagnetic coil. The larger the current, the greater the upward suction force of the moving iron core 308. The current and the opening degree of the third valve port are in a proportional relationship.

[0059] The valve closing spring 301 can be provided on the outside or inside of the current-limiting member. When the electromagnetic coil is powered off, the third valve port is reset or closed.

[0060] The working principle of the gas valve will be introduced in detail below in combination with the electromagnetic drive device, the proportional adjustment device, and the pressure regulating device.

[0061] Gas enters the flow channel inside the valve body from the inlet. The electromagnetic drive device controls the first iron core and the second iron core to move to the right, and at the same time drives the first valve plug 214 and the second valve plug 215 to disengage from the second valve port part. The second valve port of the gas valve is opened. The current size passing through the electromagnetic coil of the proportional adjustment device is adjusted to adjust the opening degree of the third valve port. In this way, the inlet communicates with the outlet cavity through the second valve port and the third valve port, and then flows out of the valve body from the outlet cavity. Among them, the pressure regulating device is used to regulate the outlet pressure of the valve body. [[ID=!4]]

[0062] In addition, a filter screen 104 can be installed at the inlet position to filter out some impurities in the gas.

[0063] The above has introduced in detail a gas valve provided by the present application. Specific examples are used herein to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A gas valve, characterized in that, It includes a valve body, an electromagnetic driving device, and a proportional regulating device. The valve body is an integral structure and is provided with a first valve port and a second valve port. The electromagnetic driving device includes a first sleeve, a magnetic attracting part, a first valve core assembly, and a second valve core assembly. The first sleeve is connected to the magnetic attracting part. The first valve core assembly includes a second sleeve, a first iron core, and a first valve plug. One end of the second sleeve is fixedly connected to the first iron core, and the other end is connected to the first valve plug. The second sleeve is slidably matched with the first sleeve, and the first valve plug can abut against or move away from the first valve port. The second valve core assembly includes a second iron core and a second valve plug connected to the second iron core. At least part of the second iron core is located inside the second sleeve, and the second valve plug can abut against or move away from the second valve port. A first elastic member is provided between the first iron core and the second iron core, and the first iron core can be attracted to and move in the direction of the magnetic attracting part with the second iron core. The valve body is provided with a third valve port. The proportional regulating device includes a current-limiting rod assembly. The current-limiting rod assembly includes a valve core component, and the valve core component directly abuts against the third valve port or the valve core component moves away from the third valve port.

2. The gas valve according to claim 1, characterized in that, The electromagnetic driving device further includes a stationary iron core installed on the valve body. The first valve core assembly further includes a second elastic member. The outer peripheral wall of the second sleeve is circumferentially sealed with the valve body, and the second sleeve can slide axially back and forth relative to the valve body. The first valve port is located outside the second valve port. When the electromagnetic driving device is powered on, the first iron core drives the first valve plug to separate from the first valve port. At the same time, the second iron core drives the second valve plug to separate from the second valve port. The second elastic member and the first elastic member are compressed, and the first valve port is in a communicating state. When the electromagnetic driving device is in a powered-off state, under the restoring force of the second elastic member, the first valve plug can abut against the first valve port. At the same time, under the restoring force of the first elastic member, the second valve plug can abut against and seal the second valve port. The first valve port is in a closed state. There is a first distance between the first iron core and the second iron core, and there is a second distance axially between the first iron core and the stationary iron core of the valve body. The first distance is less than the second distance.

3. The gas valve according to claim 2, wherein, The first valve port and the second valve port are not coplanar, and one of the first valve port and the second valve port protrudes axially toward the electromagnetic driving device side relative to the other.

4. The gas valve according to claim 3, wherein The first valve plug includes an axially extending through hole, and at least part of the second iron core passes through the through hole to be fixedly connected to the second valve plug.

5. The gas valve according to claim 4, wherein, The through hole includes a connected first hole section and a second hole section. The diameter of the first hole section is larger than that of the second hole section. The first hole section is close to the first valve port side. The end face of the first valve plug close to the first hole section abuts against the first valve port part to achieve circumferential sealing. The second valve plug is at least partially located in the first hole section. The step surface between the first hole section and the first hole section can limit the maximum axial displacement of the second valve plug outward.

6. The gas valve according to any one of claims 1 to 5, characterized in that, The valve body includes a second sleeve. The end of the second sleeve facing the second valve port is a first open end. The first sleeve is at least partially located in the inner cavity of the second sleeve and can reciprocate axially along the inner peripheral wall of the second sleeve. A part of the first sleeve extends out from the first open end of the second sleeve to connect the first valve plug.

7. The gas valve according to claim 6, characterized in that, The valve body further includes a coil component and a magnetic conductor. The coil component has a mounting hole. The second sleeve is fixedly fitted in the mounting hole. The magnetic conductor includes a receiving cavity. The coil component is located inside the receiving cavity. The end wall of the magnetic conductor close to the second valve port has a through hole for the first sleeve to pass through. The second elastic member is installed between the end wall of the magnetic conductor and the first valve plug.

8. The gas valve according to claim 7, characterized in that, The other end of the second sleeve away from the second valve port is a second open end. The outer end wall of the magnetic conductor has an extension extending into the second open end and closing the second open end. The extension forms the static iron core. The second distance is formed between the extension and the first moving magnet.

9. The gas valve according to claim 7, characterized in that, The other end of the second sleeve away from the second valve port is a second open end. It further includes a magnetic conductive bushing. The magnetic conductive bushing includes a tube body part and a bent part. The tube body part is located between the outer peripheral wall of the second sleeve and the inner peripheral wall of the mounting hole, and the tube body part sleeves at least part of the outer peripheral wall of the second sleeve. The bent part is located between the coil component and the outer end wall of the magnetic conductor.

10. The gas valve according to claim 9, characterized in that, The static iron core is installed at the second open end. An elastic buffer component is installed between the static iron core and the first iron core.

11. The gas valve according to any one of claims 1 to 5, characterized in that, It further includes a pressure regulating device. The proportional regulating device includes an electromagnetic coil, a magnet, a diaphragm, a limiting member, and a valve closing spring. The pressure regulating device and the electromagnetic coil assembly are both fixedly installed on the valve body. The magnet and the diaphragm are both installed at the first end of the limiting member, and the outer periphery of the diaphragm is fixed to the valve body. The valve closing spring is elastically pressed between the second end of the limiting member and the inner wall of the valve body opposite to it. By controlling the magnitude of the current of the electromagnetic coil, an electromagnetic force is generated between the electromagnetic coil and the magnet to push the limiting member to act to adjust the opening degree of the second valve port of the second valve port part; when the electromagnetic coil is powered off, the limiting member closes the second valve port under the restoring force of the valve closing spring; the pressure regulating device is used to set the outlet pressure of the valve body; Alternatively, it further includes a pressure regulating device for regulating the outlet pressure of the valve body. The proportional regulating device includes an electromagnetic coil, a moving iron core, a magnetic conductive housing, a limiting member, a diaphragm and a valve closing spring. A diaphragm is fixed to one end of the limiting member away from the second valve port. The outer edge of the diaphragm is fixedly connected to the valve body. A valve closing spring is press-fitted between the other end of the limiting member and the inner wall of the valve body. The magnetic conductive housing includes a circumferential portion and end wall portions connected to both ends of the circumferential portion. The circumferential portion and the two end wall portions form a cavity for accommodating the electromagnetic coil. There is a gap between the moving iron core and the end wall of the magnetic conductive housing close to the second valve port. Under the action of the electromagnetic force generated by the electromagnetic coil, the moving iron core can reciprocate along the inner hole of the electromagnetic coil in the axial direction of the second valve port to drive the limiting member to open the second valve port.

12. The gas valve according to any one of claims 1 to 10, characterized in that, The elastic force of the second elastic member is greater than the elastic force of the first elastic member.

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