CN117948443A - Gas valve - Google Patents

Abstract

The invention is characterized in that the gas valve comprises an electromagnetic driving device and a pressure difference adjusting device, when the sealing plug is propped against the second valve port part, an axial distance is reserved between the sealing plug and the first valve port part, the second flow channel, the third flow channel and the back pressure cavity are communicated, pressure difference is formed at two sides of the diaphragm, the lever body is driven by the diaphragm to actuate so that the valve plug part opens the third valve port part, and when the gas valve is applied to a large-flow condition of a large valve port, the valve opening capacity can be relatively improved.

Description

Gas valve

[ Field of technology ]

The application relates to the technical field of electromagnetic control and gas control, in particular to a gas valve.

[ Background Art ]

The electromagnetic valve with the two-section structure is used for opening and closing a fuel gas channel in the fuel gas valve so as to ensure the use safety of fuel gas, but when the electromagnetic valve is applied to a large-valve-port large-flow occasion, the pressure of an inlet pressure acting on a valve plug part of the electromagnetic valve is larger, and the electromagnetic valve needs to be opened by using larger electromagnetic force, so that how to optimally design the fuel gas valve for a person skilled in the art, when the electromagnetic valve is applied to the large-valve-port large-flow occasion, the valve opening capacity can be relatively enhanced, and the technical problem to be solved is needed.

[ Invention ]

The invention aims to provide a gas valve which can relatively enhance the valve opening capability when being applied to the large-flow occasion of a large valve port.

The invention provides a gas valve, which comprises a valve body, an electromagnetic driving device and a pressure difference device, wherein the valve body is provided with a mounting pore canal, a first circulation channel, a second circulation channel and a third circulation channel, the gas valve is provided with an inlet cavity, an outlet cavity and a back pressure cavity, the first circulation channel is communicated with the inlet cavity, the second circulation channel is communicated with the back pressure cavity, the valve body is provided with a first valve opening, part of the surface of the first valve opening forms part of the channel wall of the third circulation channel, and the third circulation channel is communicated with the outlet cavity;

The electromagnetic driving device comprises a moving core component and a core body component, the moving core component comprises a moving core component and a sealing plug connected with the moving core component, the core body component is at least partially limited in the mounting pore canal and is in sealing fit with the valve body, the core body component is provided with a second valve opening, and the sealing plug can axially displace relative to the core body component to prop against the first valve opening or prop against the second valve opening;

the pressure difference device comprises a diaphragm, a valve plug part, a connecting rod connected with the valve plug part and a lever mechanism, wherein the valve body is provided with a third valve opening part, the lever mechanism comprises a lever body and a fixing frame, part of the lever body is directly or indirectly in limit connection with the diaphragm, the other part of the lever body is directly or indirectly in limit connection with the connecting rod, the fixing frame is fixedly connected with the valve body, and the lever body can swing relative to the fixing frame.

The invention also provides a gas valve which is characterized by comprising a valve body, an electromagnetic driving device and a pressure difference device, wherein the valve body is provided with a mounting pore canal, a first circulation channel, a second circulation channel and a third circulation channel, the gas valve is provided with an inlet cavity, an outlet cavity and a back pressure cavity, the first circulation channel is communicated with the inlet cavity, the second circulation channel is communicated with the back pressure cavity, the valve body is provided with a first valve opening, part of the surface of the first valve opening forms part of the channel wall of the third circulation channel, and the third circulation channel is connected with an external pilot fire device;

The electromagnetic driving device comprises a moving core component and a core body component, the moving core component comprises a moving core component and a sealing plug connected with the moving core component, the core body component is at least partially limited in the mounting pore canal and is in sealing fit with the valve body, the core body component is provided with a second valve opening, and the sealing plug can axially displace relative to the core body component to prop against the first valve opening or prop against the second valve opening;

the pressure difference device comprises a diaphragm, a valve plug part, a connecting rod connected with the valve plug part and a lever mechanism, wherein the valve body is provided with a third valve opening part, the lever mechanism comprises a lever body and a fixing frame, part of the lever body is directly or indirectly in limit connection with the diaphragm, the other part of the lever body is directly or indirectly in limit connection with the connecting rod, the fixing frame is fixedly connected with the valve body, and the lever body can swing relative to the fixing frame.

The invention relates to a gas valve structure, which is characterized in that the gas valve structure comprises a valve body, an electromagnetic driving device and a differential pressure device, wherein the valve body is provided with a first circulation channel, a second circulation channel and a third circulation channel, the first circulation channel is communicated with an inlet cavity, the second circulation channel is communicated with a back pressure cavity, the third circulation channel is communicated with an outlet cavity or is connected with an external main fire device, the differential pressure device is additionally provided with a lever mechanism, part of the lever body is in direct or indirect limit connection with a diaphragm, and the other part of the lever body is in direct or indirect limit connection with a connecting rod, so that the valve opening capacity can be relatively enhanced when the gas valve structure is applied to a large-flow occasion of a large valve port.

[ Description of the drawings ]

FIG. 1 is a schematic cross-sectional view of a first embodiment of a gas valve according to the present invention;

FIG. 2 is an enlarged cross-sectional schematic view of the electromagnetic drive apparatus and pressure differential apparatus and lever mechanism of FIG. 1;

FIG. 3 is a schematic perspective view of a core member of the electromagnetic driving device of the gas valve according to the present invention;

FIG. 4 is a schematic perspective cross-sectional structural view of the core component of FIG. 3;

FIG. 5 is a schematic diagram of a lever mechanism and a partial differential pressure device of a gas valve according to the present invention;

FIG. 6 is a schematic perspective view of one side of the lever body of the lever mechanism of FIG. 5;

FIG. 7 is a schematic perspective view of the lever mechanism of FIG. 5 from the other side of the lever body;

FIG. 8 is a schematic partial cross-sectional view of a gas valve provided with a lever mechanism;

FIG. 9 is a schematic cross-sectional view of the overall structure of a second embodiment of a gas valve provided by the present invention;

FIG. 10 is a schematic cross-sectional view of a third embodiment of a gas valve according to the present invention

Part of the reference numerals:

The electromagnetic driving device 20, the auxiliary electromagnetic driving device 30, the electric control pressure regulating device 40, the differential pressure device 50, the main differential pressure device 60, the valve body 10, the inlet 1A, the outlet 1B, the inlet chamber 11A, the outlet chamber 11B, the first valve port portion 10a, the second valve port portion 2216, the third valve port portion 10B, the fourth valve port portion 10c, the fifth valve port portion 10d, the first flow passage 11, the second flow passage 12, the third flow passage 13, the fourth flow passage 14, the fifth flow passage 15, the sixth flow passage 16, the pressure relief passage 17, and the mounting hole 18;

The movable core assembly 21, the movable core member 211, the connecting rod 2111, the sealing plug 212, the core member 22, the main body 221, the seal 222, the main body 2211, the rib 2212, the first annular bead 2213, the second annular bead 2214, the mounting groove 2215, and the second valve port 2216;

The second movable core part 311, the second sealing plug 312, the mechanical pressure regulating device 40, the regulating mechanism 41, the piston diaphragm assembly 42, the movable core valve rod part 43, the external thread matching mechanism 44, the internal thread matching mechanism 45 and the regulating rod 46;

A main valve plug 61, a main diaphragm 62, a main back pressure chamber 63, a main valve stem 64, a valve plug portion 51, a connecting rod 52, a diaphragm 53, an elastic member 54, a back pressure chamber 55;

The lever mechanism 80, the lever body 81, the support shaft 82, the tie rod 83, the fixing frame 84, the first limiting hole 811, the second limiting hole 812, the small hole 812a, the large hole 812b, the burring 814, the first fitting hole 8141, the head 831, the plate 841, the extension 842, the guide 843, and the screw hole 8421

[ Detailed description ] of the invention

In order to better understand the technical scheme provided by the application by those skilled in the art, the technical scheme of the application is further described in detail below with reference to the accompanying drawings and the specific embodiments, and it is to be noted that the main core point of the application of the gas valve provided by the application is that when the electromagnetic driving device and the electromagnetic driving device are in cooperation and combined with the just-structured condition to realize the large-valve-port high-flow condition, the valve can be opened relatively conveniently, and other mechanisms such as the auxiliary electromagnetic driving device and the pressure regulating device can be adjusted adaptively according to the application occasion demands of the system.

First embodiment

The present application provides a gas valve comprising a valve body 10, an electromagnetic driving device 20 and a differential pressure device 50, wherein the valve body is provided with a mounting hole 18, a first flow channel 11, a second flow channel 12 and a third flow channel 13, the gas valve is provided with an inlet chamber 11A and an outlet chamber 11B, the valve body 10 is provided with a first valve opening 10a, the first valve opening 10a and the valve body 10 can be fixedly connected in a split mode through welding or the like after being arranged, part of the surface of the first valve opening 10a forms a part of the channel wall of the third flow channel 13, the first flow channel 11 is communicated with the inlet chamber 11A, the second flow channel 12 is communicated with a back pressure chamber 55 in the embodiment, the port part on one side of the third flow passage 13 forms at least part of a first valve part 10a, the port on the other side of the third flow passage 13 is communicated with an outlet cavity 11B, the electromagnetic driving device 20 comprises a moving core component 21 and a core component 22, the moving core component 21 comprises a moving core component 211 and a sealing plug 212 connected with the moving core component 211, the core component 22 is limited in a mounting pore 18, the core component 22 is in sealing fit with the valve body 10, the core component 22 is provided with a second valve port part 2216, the sealing plug 212 is positioned in the core component 22, the sealing plug 212 can axially displace relative to the core component 22, the gas valve is provided with a back pressure cavity 55, the back pressure cavity 55 is closer to the inlet cavity 11A relative to the outlet cavity 11B, the pressure difference device 50 comprises a valve plug part 51, the valve body is further provided with a third valve port part 10B, and the valve plug part 51 can be close to or far away from the third valve port part 10B;

When the sealing plug 212 abuts against the first valve opening 10a, an axial distance is provided between the sealing plug 212 and the second valve opening 2216, the first flow passage 11, the second flow passage 12 and the back pressure chamber 55 are communicated, the pressure difference between both sides of the diaphragm 53 is approximately the same, and the valve plug 51 abuts against the third valve opening 10 b;

When the sealing plug 212 abuts against the second valve port portion 2216, an axial distance is provided between the sealing plug 212 and the first valve port portion 10a, the first flow channel 11 is not communicated with the second flow channel 12 and the third flow channel, the second flow channel 12, the third flow channel 13 and the back pressure chamber 55 are communicated, gas pressure in the back pressure chamber 55 is discharged out of the outlet chamber 11B through the second flow channel 12 and the third flow channel, the pressure of the back pressure chamber 55 is reduced, the pressure difference balance between two sides of the diaphragm 53 is broken, the pressure of the inlet chamber 11A is larger, the diaphragm 53 is pressed to act downwards to drive the pull rod 83 to act downwards, the pull rod 83 is connected with the lever body 81 to drive the lever body 81 to act downwards with the fulcrum at which the fulcrum 82 is located, so that the connecting rod 52 drives the valve plug portion 51 to open the third valve port portion 10B.

According to the application, through the optimized design of the gas valve structure, the electromagnetic driving device and the pressure difference device are matched to serve as a first safety control mechanism of the gas valve, compared with the two-stage electromagnetic driving device structure in the background art, through the design, the acting force of the gas inlet pressure on the sealing plug is relatively smaller through the respective communication actions of the first flow passage, the second flow passage and the third flow passage, the coil component of the electromagnetic driving device can be designed to be miniaturized, the third valve part can be opened by using smaller electromagnetic driving force, and the valve opening capacity can be further improved through the force arm action of the lever mechanism by combining with the lever mechanism additionally arranged in the pressure difference device, so that the valve plug part 51 can be more conveniently opened by the third valve part 10b in the case of large-caliber large-flow application.

The gas valve comprises an inlet 1A of gas and an outlet 1B of gas, an inlet cavity 11A and an outlet cavity 11B are arranged, the inlet cavity 11A is close to the inlet 1A, the outlet cavity 11B is close to the outlet 1B, the inlet 1A is provided with a first filtering piece for filtering gas impurities entering the valve body 10, the outlet 1B is provided with a second filtering piece for filtering impurities to prevent the gas from entraining the impurities to flow into the combustion chamber, the gas valve comprises an electromagnetic driving device 20, a secondary electromagnetic driving device 30, an electric control pressure regulating device 40, a pressure difference device 50 and a main pressure difference device 60, the electromagnetic driving device 20 is fixedly connected with the valve body 10, the valve body 10 is provided with a mounting pore canal 18, the valve body 10 is also provided with a first flow channel 11, a second flow channel 12, a third flow channel 13, a fourth flow channel 14, a fifth flow channel 15, a sixth flow channel 16 and a pressure relief channel 17, the electromagnetic driving device 20 comprises a movable core assembly 21 and a core component 22, the moving core assembly 21 includes a moving core part 211 and a sealing plug 212, the moving core part 211 includes a connecting rod, the sealing plug 212 may be made of rubber, the sealing plug 212 is connected with the connecting rod 2111 through flexible extrusion deformation, the core part 22 is integrally limited in the mounting hole 18, the core part 22 directly or indirectly abuts against between the electromagnetic driving device 20 and the valve body 10, the electromagnetic driving device 20 includes a sleeve, the sleeve is located at the outer periphery of the moving core part 211, in this embodiment, the core part 22 directly or indirectly abuts against between the sleeve and the bottom wall of the mounting hole 18, it should be noted that, a preset space may be provided between the upper end of the core part 22 and the sleeve, the core part 22 may be press-fitted with the valve body 10 to realize integral limitation of the core part 22 in the mounting hole 18, the core part 22 realizes sealing fit with the valve body through the sealing part 222, the sealing element 22 is propped against the position between the core part 22 and the valve body, the sealing plug 212 is positioned in the core cavity, the sealing plug 212 can axially displace relative to the core part 22, one side of the first flow passage 11 is communicated with the inlet cavity 11A, the other side of the first flow passage 11 is communicated with the mounting duct cavity 181, the core part 22 is provided with a second valve port part 2216, the first valve port part 10a and the second valve port part 2216 are oppositely arranged, when the sealing plug 212 is propped against the first valve port part 10a, the sealing plug 212 is far away from the second valve port part 2216, and an axial distance is reserved between the sealing plug 212 and the second valve port part 2216; when the sealing plug 212 abuts against the second valve port portion 2216, the sealing plug 212 is far away from the first valve port portion 10a, and an axial distance is reserved between the sealing plug 212 and the first valve port portion 10 a;

one side of the second flow channel 12 is communicated with the core cavity 22A, the other side is communicated with the back pressure cavity 55 of the gas valve, the gas valve comprises a first bottom plate 100 and a second bottom plate 200, the first bottom plate 100 is in sealing fit with the diaphragm 53 of the differential pressure device 50 to form the back pressure cavity 55, the back pressure cavity 55 is closer to the inlet cavity 11A relative to the outlet cavity 11B, the second bottom plate 200 is in sealing fit with the main diaphragm 62 of the main differential pressure device 60 to form the main back pressure cavity 63, the main back pressure cavity 63 is closer to the outlet cavity 11B relative to the inlet cavity 11A, one side of the third flow channel 13 can be communicated with the core cavity, and the other side of the third flow channel and the outlet cavity 11B are communicated.

The following describes the structure of the core component 22 with reference to fig. 3 and 4, the core component 22 includes a main body 221 and a sealing element 222, the main body 221 includes a main body 2211, a rib 2212, a first annular rib 2213 and a second annular rib 2214, the rib 2212 protrudes radially outwards from the main body 2211 and is disposed along the circumference of the main body, the rib 2212 includes a horizontal portion 22121 and an extending portion 22122 extending axially from the horizontal portion 22121, one end of the extending portion 22122 is connected with the horizontal portion, the other end of the extending portion 22122 is connected with the first annular rib 2213, a mounting groove 2215 is concavely disposed between the first annular rib 2213 and the second annular rib 2214, a part of the sealing element 222 is disposed in the mounting groove 2215, the main body 221 further includes a second valve port 2216, the second valve port 2216 extends axially downwards from the main body 2211, the second valve port 2216 is disposed with a second valve port 22161, in this embodiment, the core component is disposed with the sealing element 222, and is disposed with the sealing element 222 in the side wall of the valve body, and is disposed in the same manner as that the sealing element is disposed in the side wall of the valve body, and is disposed in the side wall of the valve body 11, and is in the same way as the side of the valve channel is disposed in the side of the channel, and is in the channel, and the channel is in communication with the channel is in the channel and the channel is in the channel-side channel-wall and the channel-side channel-wall.

Referring to fig. 5 to 8, the lever mechanism 80 of the differential pressure device for a gas valve and the connection relation thereof according to the present invention will be described, the lever mechanism 80 includes a lever body 81, a support shaft 82, a pull rod 83, and a fixing frame 84, the fixing frame 84 includes a plate-shaped portion 841, an extension portion 842, and a guide portion 843, the extension portion 842 protrudes from the plate-shaped portion 841 toward the diaphragm 53, the extension portion 842 is provided with a screw hole 8421 engaged with a screw, the fixing frame is fixedly connected to the valve body 10 by screw fastening, the extension portion 842 is provided with a first engagement hole, the support shaft 82 penetrates the first engagement hole, the guide portion 843 protrudes from the plate-shaped portion 841 toward the direction away from the diaphragm 53, the extension portion 842 is disposed opposite to the extension direction of the guide portion 843, the connecting rod 52 penetrates the guide portion 843, the guide portion 843 is slidably engaged with the connecting rod 53, the connecting rod 52 includes a first end portion connected to the valve plug portion 51, and a second end portion clamped to the lever body 81 is limited, the elastic member 54 is sleeved on the outer periphery of the connecting rod 52, one side of the elastic member 54 is abutted against the plate-shaped portion 841, the other side of the elastic member 54 is abutted against the valve plug portion 51, the lever body 81 comprises a lever plate-shaped portion and a flanging portion 814, the flanging portion 814 protrudes from the lever plate-shaped portion to integrally strengthen the strength of the rigid body 81, the flanging portion 814 is provided with a second matching hole 8141, the second matching hole 8141 is arranged corresponding to the first matching hole, the fulcrum 82 penetrates through the second matching hole 8141, in this embodiment, a part of the lever body is in limit connection with the diaphragm through the pull rod 83, the other part of the lever body is directly in limit connection with the connecting rod, so that the lever body swings around the fulcrum to form an arc track, in detail, the lever body 81 can swing around the fixing frame 84 by taking the fulcrum 82 as a fulcrum, the lever plate-shaped portion is also provided with a first limit hole 811 and a second limit hole 812, the first limiting hole 811 is formed by recessing inwards from the edge of the lever plate-shaped part, the first limiting hole 811 is approximately of a strip arch-shaped structure, the pull rod 83 comprises an end head 831, a rod body part and a second end head, the end head 831 and the second end head are arranged on two sides of the rod body part, the end head 831 is clamped and abutted against the first limiting hole 811, part of the rod body part is arranged in the first limiting hole 811, the outer diameter of the end head 831 is larger than the aperture of the first limiting hole 811, the second end head of the pull rod 83 is fixedly connected or limited and connected with the diaphragm 53 in a riveting deformation or bonding mode, the second limiting hole 812 comprises a small hole 812a and a large hole 812b, the second limiting hole 812 penetrates through the upper surface and the lower surface of the lever plate-shaped part, approximately of the strip hole-shaped structure extends along the length direction of the lever body 81, the aperture of the small hole is larger than the aperture of the second end of the connecting rod 52, the second end can extend into the small hole 812a approximately in the radial direction to realize the clamping and connection with the small hole 812a, the second end of the large hole is directly connected with the lever body part 53 through the lever body part, and the lever body part is directly limited and the diaphragm 53 is directly connected with the lever body part through the large hole 53;

The principle of the cooperation between the electromagnetic driving device 20 and the pressure difference device 50 of the gas valve provided by the invention is described in detail below, when the gas valve is in a closed state, the exciting action of the coil component of the electromagnetic driving device 20 is reduced, the moving core component 21 moves axially downwards, the sealing plug 212 moves axially downwards relative to the core component 22, the sealing plug 212 abuts against the first valve opening 10a, an axial space is reserved between the sealing plug 212 and the second valve opening 2216, the gas pressure of the inlet cavity 11A enters the mounting pore cavity 181 through the first flow channel 11, the gas enters the core cavity through the second valve opening 22161 of the second valve opening 2216 and then is communicated with the back pressure cavity 55 through the second flow channel 12, at this time, the pressure difference at two sides of the diaphragm 53 is approximately balanced, and the valve plug 51 keeps abutting against the third valve opening 10b under the restoring force of the elastic piece 54; when the gas valve is switched from the closed mode to the open valve mode, the electromagnetic driving device 20 is excited by the coil component, the movable core assembly 21 moves axially upwards, the sealing plug 212 moves axially upwards relative to the core component 22, the sealing plug 212 abuts against the second valve port portion 2216, an axial distance is reserved between the sealing plug 212 and the first valve port portion 10a, at this time, the first flow channel 11 is not communicated with the second flow channel 12, the first flow channel 11 is not communicated with the third flow channel 13, the gas pressure in the back pressure cavity 55 is discharged from the third flow channel 12 to the outlet cavity 11B through the core cavity and the first valve port portion 10a from the third flow channel 13, the gas pressure in the back pressure cavity 55 is reduced, the balance of the pressure difference between two sides of the diaphragm 53 is broken, the gas pressure in the inlet cavity 11A is higher, the diaphragm 53 moves downwards under the pressure action, so as to drive the pull rod 83 to move downwards, the pull rod 83 is in limited connection with the lever body 81, the lever body 81 also moves the link 52 downwards, and finally the valve plug portion 51 is driven by the link 52 to open the third valve port portion 12, the third valve port portion 10B is opened, the first connection position is better defined as a distance between the first connection point and the second connection point 2, the second connection point is defined as a second connection point 2, the position is a second connection point 2, and the position is better defined as a position between the second connection point 2, and the position is a position of the second connection point is a position, and a position is 2, and has a position is defined as a position, and a position 2, and a position is 2, and is a position, and is 2, and has a position, and is a position, and has a position 2 and a position, and a 2 and is 2 and a position, and is: (L1+L2)/L2 is more than or equal to 1.5 and less than or equal to 3.

According to the application, through the arrangement, the gas valve mechanism is optimally designed, compared with the two-stage electromagnetic driving device structure arranged in the gas valve in the background art, through the respective communication actions of the first flow channel, the second flow channel and the third flow channel, the acting force of the gas inlet pressure on the sealing plug is relatively smaller, the coil component of the electromagnetic driving device can be designed to be miniaturized, the third valve part can be opened by using smaller electromagnetic driving force, and then the valve opening capacity is further improved by means of the force arm action of the lever mechanism in combination with the lever mechanism additionally arranged in the differential pressure device, so that the opening of the third valve part can be more conveniently realized in the large-caliber large-flow application occasion.

The structure of the electric control pressure regulating device 40 and the main pressure difference device 60 of the gas valve provided in this embodiment is described below, the electric control pressure regulating device 40 is fixedly connected with the valve body 10, and includes an adjusting mechanism 41, a piston diaphragm assembly 42, a movable core valve rod component 43, an external screw thread matching mechanism 44, an internal screw thread matching mechanism 45 and a limiting rod 46, the piston diaphragm assembly 42 can be close to or far from the fifth valve opening 10d, the movable core valve rod component 43 is located above the static iron core, the movable core valve rod component 43 can be close to or far from the static iron core, the adjusting mechanism 41 is located in the mounting part, the adjusting mechanism and the mounting part are in screw thread matching to form the external screw thread matching mechanism 44 of the electric control pressure regulating device 40, the adjusting mechanism 41 can displace circumferentially relative to the mounting part, when the gas valve is in a high-pressure outlet pressure mode, the movable core valve rod component 43 acts downwards to absorb with the static iron core, and the adjusting mechanism 41 can limit the displacement of the movable core valve rod component 43 so as to perform precise gas regulation in the high-pressure outlet pressure mode; the limiting rod 46 and the regulating mechanism 41 are in threaded fit to form an internal threaded fit mechanism 45 of the electric control pressure regulating device 40, the limiting rod 46 can displace axially relative to the regulating mechanism 41, when the gas valve is in a low-pressure outlet pressure mode, the movable core valve rod part 43 can move upwards axially to abut against the limiting rod 46, the limiting rod 46 can control the axial displacement of the movable core valve rod part 43 so as to regulate further gas flow under the low-pressure outlet pressure mode, a relatively accurate gas regulating effect is achieved, the main pressure difference device 60 comprises a main valve plug 61, a main valve rod 64 connected with the main valve plug 61 and a main diaphragm 62, the gas valve is provided with a main back pressure cavity 63, and the second base plate 200 is in sealing fit with the main diaphragm 62 of the main pressure difference device 60 to form the main back pressure cavity 63.

The following states the operation principle of the gas valve provided in this embodiment, when the gas valve is in the open mode, the electromagnetic driving device 20 is excited by the coil component, the moving core assembly 21 moves axially upward, the sealing plug 212 and the first valve opening portion 10a have a predetermined distance therebetween, the sealing plug 212 keeps abutting against the second valve opening portion 2216, at this time, the first flow passage 11 is not communicated with the third flow passage 13 and the first flow passage 11 is not communicated with the second flow passage 12, the gas pressure in the back pressure chamber 55 is discharged from the third flow passage 13 to the outlet chamber 11B through the core chamber and the first valve opening portion 10a through the third flow passage 12, the gas pressure in the back pressure chamber 55 is reduced, the pressure difference balance across the diaphragm 53 is broken, the gas pressure in the inlet chamber 11A is high, the diaphragm 53 is forced downward to drive the pull rod 83 to move downward, the pull rod 83 is connected with the lever body 81 in a limit, further, the lever body 81 is driven to move downwards, the lever body 81 drives the connecting rod 52 to move downwards, finally, the connecting rod 52 drives the valve plug part 51 to open the third valve opening 10B, the second movable core part 311 is also axially moved upwards under the excitation action of the coil part, the second sealing plug 312 leaves the fourth valve opening 10c, fuel gas flows out of the third valve opening 10B and flows into the fourth circulation channel 14, the fuel gas enters the fifth circulation channel 15 and the sixth circulation channel 16 through the fourth valve opening 10c, when the outlet pressure is in a higher pressure mode, the movable core valve rod part 43 moves downwards to attract the static iron core, the piston diaphragm assembly 42 moves downwards to be close to the fifth valve opening 10d, a part of fuel gas flows out of the outlet cavity 11B through the pressure relief channel 17, one side port of the fifth circulation channel 15 forms the fourth valve opening 10c, the other side port of the sixth circulation channel 16 forms the fifth valve opening 10d, the other side is communicated with the fifth flow channel, and under the downward action of the piston diaphragm assembly 42, the gas pressure in the fifth flow channel 15 and the sixth flow channel is increased and acts on the main back pressure cavity 63, the main back pressure cavity 63 is pressed against the main diaphragm 62, the main diaphragm 62 is abutted against the main valve rod 64, the main valve plug 61 further acts axially upwards to open the main valve opening 10e, and the gas flows out of the outlet 1B from the main valve opening 10e to flow to the combustion chamber.

Second embodiment

Referring to fig. 9 in combination with fig. 1, the gas valve according to the second embodiment of the present application is different from the gas valve according to the first embodiment in that the pressure regulating device is a mechanical pressure regulating device, the mechanical pressure regulating device 40 'includes a diaphragm seal assembly 44', a regulating nut 42', and a compression spring 43', the regulating nut 42 'is axially displaceable with respect to the housing by the threaded engagement of the regulating nut 42' with the housing 41', so that the diaphragm seal assembly 44' can approach or separate from the fifth valve port 10d, when the gas valve is in the open mode, the electromagnetic driving device 20 is excited by the coil member, the moving core assembly 21 moves axially upward, there is an axial distance between the sealing plug 212 and the first valve port 10a, the sealing plug 212 abuts against the second valve port 2216, when the first flow passage 11 is not in communication with the third flow passage 13 and the first flow passage 11 is not in communication with the second flow passage 12, the gas pressure in the back pressure chamber 55 is discharged from the third circulation channel 13 to the outlet chamber 11B through the core cavity and the first valve opening 10a by the third circulation channel 12, the gas pressure in the back pressure chamber 55 is reduced, the balance of the pressure difference between the two sides of the diaphragm 53 is broken, the gas pressure in the inlet chamber 11A is higher, the diaphragm 53 is acted downwards under the pressure action to drive the pull rod 83 to act downwards, the pull rod 83 is in limited connection with the lever body 81, and further drives the lever body 81 to act downwards, the lever body 81 drives the connecting rod 52 to act downwards, finally the connecting rod 52 drives the valve plug part 51 to open the third valve opening 10B, the gas flows out from the third valve opening 10B to the fourth circulation channel 14, the gas enters the fifth circulation channel 15 and the sixth circulation channel 16 through the fourth valve opening 10c, when the outlet pressure is in a higher pressure mode, the adjusting nut 42 'is screwed with the housing by an external operation tool, such as a straight screwdriver, the adjusting nut 42' acts downwards to apply an acting force to the compression spring 43', the compression spring 43' applies an acting force to the diaphragm seal assembly 44', the diaphragm seal assembly 44' approaches the fifth valve opening 10d, a part of fuel gas flows out of the outlet cavity 11B through the pressure release channel 17, one side port of the fifth flow channel 15 forms the fourth valve opening 10c, the other side communicates with the main back pressure cavity 63, one side port of the sixth flow channel 16 forms the fifth valve opening 10d, the other side communicates with the fifth flow channel, the fuel gas pressure in the fifth flow channel 15 and the sixth flow channel increases to act on the main back pressure cavity 63, the main back pressure cavity 63 is pressed against the main diaphragm 62, the main diaphragm 62 abuts the main valve stem 64, and the main valve 61 acts upwards axially to open the opening 10e, the fuel gas flows out of the outlet 1B from the main valve opening 10e to flow to the combustion chamber, the electronic control pressure regulator in this embodiment is changed to a mechanical pressure regulator, the technical scheme of the application can be realized as well, the specific structure of the electromagnetic valve plug 20 and the valve plug 50 are not further detailed in this embodiment, and the detailed relation of the mutual connection is not described.

Third embodiment

Referring to fig. 10, in the gas valve according to the second embodiment of the present application, unlike the first embodiment, the main difference is that, in this embodiment, a part of the lever body 81a of the lever mechanism 80 is directly and limitedly connected with the diaphragm 53a, another part of the lever body 81a is indirectly and limitedly connected with the connecting rod 52a through the pin portion, the diaphragm 53a includes a pull member 531a, the pull member 531a and the diaphragm 53a are in an integral structure, the pull member 531a protrudes from the body portion of the diaphragm 53a, the pull member 531a is provided with a pull member head 5311a, the pull member head 5311a is limited in a first limiting hole portion 812a of the lever body 81a, the lever mechanism includes a pin portion 500, the lever body 81a is provided with a flange protruding portion 811a, the flange protruding portion 811a is provided with a first matching hole corresponding to the pin portion 500, the connecting rod 52a includes a first end portion 521a, the first end portion 522a is connected with the valve plug portion 51, the second end portion 522a and part of the body 81a passes through the second limiting hole portion 813a, the lever portion 52a is provided with a corresponding first matching hole 523a and a corresponding to the first matching hole 523a, and the first matching hole co-operating with the first hole is implemented in the first embodiment of the application, and the differential pressure device is not described in detail.

According to the application, through the arrangement, the gas valve mechanism is optimally designed, compared with the two-stage electromagnetic driving device structure arranged in the gas valve in the background art, through the respective communication cooperation effects of the first flow channel, the second flow channel and the third flow channel, the acting force of the gas inlet pressure on the sealing plug is relatively smaller, the coil component of the electromagnetic driving device can be miniaturized to open the third valve part by using smaller electromagnetic driving force, and the valve opening capacity is further improved by means of the force arm effect of the lever mechanism in combination with the lever mechanism additionally arranged in the differential pressure device, so that the opening of the third valve part can be more conveniently realized in the large-caliber large-flow application occasion.

It should be noted that, the terms of up, down, etc. mentioned herein are all introduced for convenience of description based on the drawings of the specification, and the terms of "first" and "second" are also introduced for convenience of description of the parts, not for limitation of the sequence, and the electromagnetic driving device structure and the differential pressure device structure of the gas valve provided by the related technical solutions and the cooperation relationship between them are described in detail, and only a few specific embodiments are used herein, the description of the above embodiments is only for helping to understand the method and the core idea of the invention, and the invention is not limited in any way.

Claims (10)

1. The gas valve is characterized by comprising a valve body, an electromagnetic driving device and a pressure difference device, wherein the valve body is provided with a mounting pore canal, a first circulation channel, a second circulation channel and a third circulation channel, the gas valve is provided with an inlet cavity, an outlet cavity and a back pressure cavity, the first circulation channel is communicated with the inlet cavity, the second circulation channel is communicated with the back pressure cavity, the valve body is provided with a first valve opening, part of the surface of the first valve opening forms part of the channel wall of the third circulation channel, and the third circulation channel is communicated with the outlet cavity;

The electromagnetic driving device comprises a moving core component and a core body component, the moving core component comprises a moving core component and a sealing plug connected with the moving core component, the core body component is at least partially limited in the mounting pore canal and is in sealing fit with the valve body, the core body component is provided with a second valve opening, and the sealing plug can axially displace relative to the core body component to prop against the first valve opening or prop against the second valve opening;

the pressure difference device comprises a diaphragm, a valve plug part, a connecting rod connected with the valve plug part and a lever mechanism, wherein the valve body is provided with a third valve opening part, the lever mechanism comprises a lever body and a fixing frame, part of the lever body is directly or indirectly in limit connection with the diaphragm, the other part of the lever body is directly or indirectly in limit connection with the connecting rod, the fixing frame is fixedly connected with the valve body, and the lever body can swing relative to the fixing frame.

2. The gas valve according to claim 1, wherein the fixing frame includes a plate-like portion, a guide portion and an extension portion, the guide portion protrudes from the plate-like portion in a direction away from the lever body, the extension portion protrudes from the plate-like portion, an extending direction of the extension portion is opposite to an extending direction of the guide portion, the lever mechanism includes a fulcrum shaft, the extension portion is provided with a first fitting hole, the lever body is provided with a second fitting hole provided corresponding to the first fitting hole, and the fulcrum shaft penetrates through the first fitting hole and the second fitting hole.

3. The gas valve according to claim 2, wherein the differential pressure device comprises a connecting rod and an elastic member, the connecting rod is in sliding fit with the guiding portion, the elastic member is sleeved on the outer periphery of the connecting rod, the elastic member abuts against the space between the plate-shaped portion and the valve plug portion, the connecting rod comprises a first end portion and a second end portion, the first end portion is connected with the valve plug portion, and the second end portion is clamped and limited with the lever body.

4. A gas valve according to claim 3, wherein the lever body includes a lever plate-like portion from which the flange portion protrudes, the lever plate-like portion being provided with a first limit hole portion and a second limit hole portion, and a flange portion provided with the second fitting hole, the lever body being swingable with respect to the mount about the fulcrum.

5. The gas valve according to claim 4, wherein the first limiting hole portion is concavely formed from the edge of the lever plate-shaped portion toward the second limiting hole portion, the lever mechanism further comprises a pull rod, the pull rod comprises an end head portion, the end head portion is clamped and limited with the first limiting hole portion, and the other side of the pull rod is fixedly connected or limited with the diaphragm.

6. The gas valve of claim 5, wherein the second limiting aperture is generally elongated and includes a small aperture and a large aperture, the second end being capable of being limited by the large aperture in a snap fit engagement with the small aperture.

7. A gas valve as claimed in any one of claims 1 to 6, wherein the lever mechanism further comprises a pull rod, one side of the pull rod is in limit connection with the lever body, the other side of the pull rod is in fixed connection or limit connection with the diaphragm, when the sealing plug abuts against the second valve port portion, an axial distance is provided between the sealing plug and the first valve port portion, the back pressure chamber is communicated with the third flow passage through the second flow passage, the diaphragm is acted downwards by pressure from the inlet chamber to exert an action on the pull rod, and the pull rod drives the lever body to act downwards to enable the valve plug portion to open the third valve port portion.

8. The gas valve of claim 7, wherein a first connection position is defined for the pull rod and the diaphragm, a second connection position is defined for the connecting rod and the lever body, a fulcrum position is defined for a fulcrum of the lever mechanism, a distance L1 is defined between the first connection position and the second connection position, and a distance L2 is defined between the second connection position and the fulcrum position, so that: (L1+L2)/L2 is more than or equal to 1.5 and less than or equal to 3.

9. The gas valve according to claim 1, wherein the diaphragm comprises a pulling member, the pulling member and the diaphragm are integrally structured, the lever body comprises a first limiting hole portion and a second limiting hole portion, a pulling member head of the pulling rod is limited to the first limiting hole portion, the connecting rod comprises a first end portion, a second end portion and a rod body portion, the first end portion is connected with the valve plug portion, the second end portion and a part of the rod body portion penetrate through the second limiting hole portion, the lever body comprises a flanging flange portion, the flanging flange portion is provided with a first matching hole, the rod body portion is provided with a second matching hole corresponding to the first matching hole, and the pin portion penetrates through the first matching hole and the second matching hole.

10. The gas valve is characterized by comprising a valve body, an electromagnetic driving device and a pressure difference device, wherein the valve body is provided with a mounting pore canal, a first circulation channel, a second circulation channel and a third circulation channel, the gas valve is provided with an inlet cavity, an outlet cavity and a back pressure cavity, the first circulation channel is communicated with the inlet cavity, the second circulation channel is communicated with the back pressure cavity, the valve body is provided with a first valve opening, part of the surface of the first valve opening forms part of the channel wall of the third circulation channel, and the third circulation channel is connected with an external pilot fire device;

The electromagnetic driving device comprises a moving core component and a core body component, the moving core component comprises a moving core component and a sealing plug connected with the moving core component, the core body component is at least partially limited in the mounting pore canal and is in sealing fit with the valve body, the core body component is provided with a second valve opening, and the sealing plug can axially displace relative to the core body component to prop against the first valve opening or prop against the second valve opening;

the pressure difference device comprises a diaphragm, a valve plug part, a connecting rod connected with the valve plug part and a lever mechanism, wherein the valve body is provided with a third valve opening part, the lever mechanism comprises a lever body and a fixing frame, part of the lever body is directly or indirectly in limit connection with the diaphragm, the other part of the lever body is directly or indirectly in limit connection with the connecting rod, the fixing frame is fixedly connected with the valve body, and the lever body can swing relative to the fixing frame.