A gas proportional valve

Abstract

The electromagnetic driving device of the gas proportional valve provided by the present invention includes a static iron core, a first sleeve part, a first core body assembly, a second core body assembly, a first elastic part and a second elastic part. The first core body assembly includes a first moving iron core, a second sleeve part and a first sealing part. The first sealing part can close a first valve port. The second core body assembly includes a second moving iron core and a second sealing part. The second sealing part closes a second valve port. When one of the core body assemblies fails to close the valve port, the other can still close the valve port to ensure the use safety of the gas proportional valve.

Description

Technical Field

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

[0002] At present, for gas proportional valves on the market, in order to prevent gas leakage, usually at least two valve ports are adopted, and the two valve ports are opened or closed by two independent solenoid valves. When one of the valves fails, the other valve can still close the valve port to ensure the safe use of the gas proportional valve. Summary of the Invention

[0003] The main object of the present invention is to provide a gas proportional valve with a new structure, which can also achieve that when one of the valves fails, the other valve can still close the valve port.

[0004] The present invention provides a gas proportional valve, which includes a body, a first valve port and a second valve port, and further includes an electromagnetic driving device. The electromagnetic driving device includes a static iron core, a first sleeve part, a first core body assembly, a second core body assembly, a first elastic member, and a second elastic member. The first core body assembly includes a first moving iron core, a second sleeve part, and a first sealing part. The second sleeve part is fixedly connected or limitedly connected to the first moving iron core. The lower end of the first sleeve part is fixedly connected or limitedly connected to the first sealing part. The first elastic member abuts against the first sealing part. The second core body assembly includes a second moving iron core and a second sealing part. The lower end of the second moving iron core is fixedly connected or limitedly connected to the second sealing part. The first moving iron core and / or the second moving iron core is provided with a concave part, at least part of the second elastic member is located in the concave part and one end abuts against the first moving iron core and the other end abuts against the second moving iron core;

[0005] When the electromagnetic driving device is energized, the first moving iron core can drive the second sleeve part and the first sealing part to perform an axial upward movement along the first sleeve wall of the first sleeve part, so that the first sealing part is away from the first valve port, the second moving iron core can drive the second sealing part away from the second valve port, the first moving iron core can abut against the second moving iron core and the first moving iron core and the second moving iron core are close to the static iron core;

[0006] When the electromagnetic driving device is in a power-off state, the first sealing part closes the first valve port and the second sealing part closes the second valve port. A first distance is formed between the first moving iron core and the second moving iron core, and a second distance is formed between the first moving iron core and the closed end of the first sleeve. The first distance is smaller than the second distance.

[0007] The electromagnetic drive device of the gas proportional valve provided by the present invention includes a static iron core, a first sleeve portion, a first core component, a second core component, a first elastic member, and a second elastic member. The first core component includes a first moving iron core, a second sleeve portion, and a first sealing portion. The first sealing portion can close the first valve port. The second core component includes a second moving iron core and a second sealing portion. The second sealing portion can close the second valve port. When one of the core components fails to close the valve port, the other can still close the valve port to ensure the safe use of the gas proportional valve. Description of the Drawings

[0008] Figure 1 It is a cross-sectional view of the overall structure of the electromagnetic drive device of the gas proportional valve provided by the present invention;

[0009] Figure 2 It is a cross-sectional view of the overall structure of the gas proportional valve provided by the present invention;

[0010] Figure 3 It is a cross-sectional view of the overall structure of the proportional adjustment device of the gas proportional valve provided by the present invention;

[0011] Figure 4 It is a three-dimensional schematic diagram of the proportional adjustment device of the gas proportional valve provided by the present invention; Detailed Description of the Invention

[0012] As Figure 2 The shown gas proportional valve includes a body 1, an inlet 1a, and an outlet 1b. A main gas flow channel 1c is formed inside the body 1. Gas flows in from the inlet 1a and out from the outlet 1b. The body 1 can be formed by die-casting of aluminum alloy. The body 1 is also provided with a first valve port 101 and a second valve port 102. The gas proportional valve further includes an electromagnetic drive device 10, and the electromagnetic drive device 10 is fixedly connected to the body 1.

[0013] The electromagnetic drive device 10 includes a static iron core 13, a first sleeve portion 15, a first core component 16, a second core component 17, a first elastic member 18, and a second elastic member 19. It also includes a housing 11 and a coil component 12. The coil component 12 is located on the outer peripheral portion of the first sleeve portion 15. The housing 11 generally covers the coil component 12. The first core component 16 can approach or move away from the first valve port 101 to open or close it. The second core component 17 can approach or move away from the second valve port 102 to open or close it. And when the first core component 16 fails to close the first valve port 101, the second core component 17 can still close the second valve port 102 to ensure the safe use of the gas proportional valve and prevent gas leakage. Through the optimized design of the electromagnetic drive device, it forms two-stage core components to control the valve ports respectively, making the overall structure of the gas proportional valve relatively simpler while still ensuring the use safety.

[0014] Next, in combination withFigure 1 - Figure 2The structure of the electromagnetic driving device of the gas proportional valve provided by the present invention is introduced in detail. The electromagnetic driving device 10 includes a static iron core 13, a first sleeve part 15, a first core component 16, a second core component 17, a first elastic member 18 and a second elastic member 19. It also includes a housing 11 and a coil component 12. The housing 11 has magnetic permeability. The coil component 12 includes a bobbin 122. An inner hole 121 is provided at a generally central position of the coil component 12. At least a part of the static iron core 13 is located in the inner hole 121. The static iron core 13 can be fixedly connected to the upper part of the housing 11 by riveting, welding or other means, or can be limitedly connected to the upper part of the housing 11 by dotting and limiting or other means. In this embodiment, an opening part is provided at the upper part of the housing 11. The static iron core 13 is provided with a protruding part corresponding to the opening part, and can be fixedly connected by riveting, welding or other means. The static iron core 13 is also provided with a concave part 131. The concave part 131 is recessed approximately towards the upper part of the housing 11 and includes a bottom wall 131a and a side wall 131b. The first sleeve part 15 is generally in a cylindrical structure with one end closed and the other end open. At least a part of the first sleeve part 15, that is, the cylindrical main body part of the first sleeve part 15, is located in the inner hole 121. The first sleeve part 15 includes a closed end 15a and an open end 15b. The open end 15b includes an extension part 151b extending in the circumferential direction. A part of the extension part 151b is relatively close to the second sleeve part 162 of the first core component 16, and another part of the extension part 151b is relatively far from the second sleeve part 162. A part of the extension part 151b is clamped between the housing 11 and the first elastic member 18, and the upper and lower ends are respectively abutted against the housing and the first elastic member. Another part of the extension part is clamped between the housing 11 and the seal 100, and the upper and lower ends are respectively abutted against the housing and the seal, so that the whole electromagnetic driving device is fixedly and hermetically connected to the body 1 to prevent gas leakage. The closed end 15a is located in the concave part 131 and the closed end 15a is relatively close to the bottom wall 131a or abuts against the bottom wall 131a. The side wall 131b is relatively close to or abuts against the first sleeve wall 15c of the first sleeve part 15. The first core component 16 includes a first moving iron core 161, a second sleeve part 162 and a first sealing part 163. The first moving iron core 161 can be made of soft magnetic material, without magnetism in the non-powered state, and has a magnetic effect when entering the powered mode. The first moving iron core 161 and the second sleeve part 162 can be fixedly connected by welding or other means or can be limitedly connected to the first moving iron core by dotting on the second sleeve part. Both the first sleeve part 15 and the second sleeve part 162 can be made of non-magnetic stainless steel material by stretching process. The lower end part of the second sleeve part 162 is fixedly connected or limitedly connected to the second sealing part 163. In this embodiment, the two can be connected by a limiting method. The second sealing part 163 includes a cap-shaped metal part and a rubber part. The cap-shaped metal part generally covers the rubber part. In this embodiment, the flanging of the second sleeve part 162 is squeezed into the rubber part through the flexible deformation of the rubber part and is tightly fitted with it.The lower end of the second sleeve portion 162 can also be extended and flanged to limit the first sealing portion 163, and the two are fixedly connected by welding or the like. The upper end of the first elastic member 18 abuts against the extension portion 151b and the other end abuts against the first sealing portion 163. When powered off, the valve closing force of the first elastic member 18 can cause the first sealing portion 163 to close the first valve port 101. The electromagnetic driving device further includes a first accommodating cavity A1 and a second accommodating cavity A2. The first sleeve portion 15 generally defines the second accommodating cavity A2. At least part of the first core assembly 16 can axially move up and down in the second accommodating cavity A2. When the coil component is powered on, the first moving iron core 161 can drive the second sleeve portion 162 and the first sealing portion 163 to axially move upward along the first sleeve wall 15c, so that the first sealing portion 163 moves relatively away from the first valve port 101. The second moving iron core 171 can drive the second sealing portion 172 away from the second valve port 102. The second core assembly 17 includes a second moving iron core 171 and a second sealing portion 172. The second moving iron core 171 can be made of soft magnetic material. The second moving iron core 171 includes a body 171a and a valve stem 172a. The second moving iron core 171 can be an integrally formed structure or can be formed by separately processing the body 171a and the valve stem 172a and then fixedly connecting them. The first moving iron core 161, the second sleeve portion 162 and the first sealing portion 163 generally define the first accommodating cavity A1. At least part of the second moving iron core 171 is located in the first accommodating cavity A1. The second moving iron core 171 can drive the second sealing portion 172 to approach or move away from the second valve port 102. The valve stem 172a has a rod head 1721a, and the rod head is fixedly connected or limitedly connected to the second sealing portion 172. The second sealing portion 172 can be made of rubber. The rod head is squeezed into a tight fit with it through the flexible deformation of the rubber part. The first sealing portion 163 is provided with an opening, and at least part of the valve stem 172a extends out of the opening. At least part of the second moving iron core 171 can axially move up and down along the second sleeve wall of the second sleeve portion 162 in the first accommodating cavity A1. The first sleeve portion 15 is sleeved on the outer periphery of the first moving iron core 161 and at least part of the second sleeve portion 162. In the state where the coil component is not powered on, a first distance L1 is formed between the first moving iron core 161 and the second moving iron core 171. This first distance L1 is also the first magnetic gap formed between the first moving iron core and the second moving iron core. The first moving iron core 161 has an upper end face 161a, and a second distance L2 is formed between the upper end face 161a and the closed end 15a of the first sleeve portion 15. The first distance L1 is less than the second distance L2. In this embodiment, the second moving iron core 171 is provided with a recess 171a. At least part of the second elastic member 19 is located in the recess 171a and one end abuts against the bottom wall of the recess 171a and the other end abuts against the end face of the first moving iron core 161. Additionally, the first moving iron core 161 can also be provided with this recess. When the first moving iron core 161 is provided with this recess,One end of the second elastic member 19 can also abut against the top wall of the concave portion, and the other end can abut against the end face of the second moving iron core 171. Alternatively, the first moving iron core 161 and the second moving iron core 171 can be provided with this concave portion at the same time. A part of the second elastic member 19 is located in the concave portion of the first moving iron core 161, and another part of the second elastic member 19 is located in the concave portion of the second moving iron core 171, and one end of the second elastic member 19 abuts against the first moving iron core 161 and the other end abuts against the second moving iron core 171.,

[0015] The electromagnetic driving device 10 further includes a magnetic conductive member 14. The magnetic conductive member 14 is sleeved on the outer peripheral wall of the first sleeve portion 15. The magnetic conductive member 14 includes a vertical portion 141 and a flanging portion 142. The magnetic conductive member 14 is generally in a cap-like structure with openings at both the upper and lower ends. In the longitudinal direction, the vertical portion 141 is clamped between the skeleton 122 and the first sleeve portion 15, and the inner wall of the vertical portion 141 abuts against the outer peripheral wall. The outer wall of the vertical portion 141 abuts against the skeleton 122. In the transverse direction, the flanging portion 142 is clamped between the skeleton 122 and the housing 11, the upper end abuts against the skeleton 122, and the lower end abuts against the lower part of the housing 11. The magnetic conductive member 14 abuts against the second moving iron core 171 through the first sleeve portion 15, and can transfer magnetic force to the second moving iron core 171 when energized. In order to ensure a good magnetic conduction effect, the vertical portion 141 can be set to be longer.

[0016] The actuation principle of the electromagnetic driving device is introduced in detail below, such as Figure 1 and Figure 2The figure shows the electromagnetic drive device in the fully closed valve position state. At this time, the coil component 12 is in the power-off mode. The first moving iron core 161 is relatively far away from the static iron core 13. A second distance L2 is formed between the upper end surface 161a of the first moving iron core 161 and the closed end 15a. The first sealing portion 163 closes the first valve port 101 under the valve closing force applied by the first elastic member 18. The second sealing portion 172 closes the second valve port 102 under the valve closing force applied by the second elastic member 19. A first distance L1, which is the first magnetic gap, is formed between the first moving iron core 161 and the second moving iron core 171. When the coil component 12 starts to switch to the energized state, under the influence of the electromagnetic force, part of the magnetic force of the magnetically conductive housing 11 is transmitted to the static iron core 13 through the upper part of the housing 11, and the other part of the magnetic force is transmitted to the magnetic conductive member 14 and the second moving iron core 171 through the lower part of the housing 11. A second magnetic gap S2 is formed between the upper end surface 161a of the first moving iron core 161 and the side wall 131b of the static iron core 13. A first magnetic gap S1 is formed between the lower end surface of the first moving iron core 161 and the second moving iron core 171. The first moving iron core 161 is in a suspended state, and relatively less magnetic force gathers in the second magnetic gap S2. The first distance L1 is smaller than the second distance L2, and the first magnetic gap S1 is relatively small. Under the action of the magnetic conductive member 14, the magnetic conductive member 14 can transmit more magnetic force to the second moving iron core 171, and more magnetic force gathers in the first magnetic gap S1. The magnetic force at this part is stronger. The second moving iron core 171 overcomes the spring force of the second elastic member 19, and the first moving iron core 161 can preferentially attract the second moving iron core 171. After the first moving iron core 161 and the second moving iron core 171 are in contact, the first magnetic gap S1 is eliminated, that is, the first distance L1 is eliminated. At this time, the first moving iron core 161 and the second moving iron core 171 form a whole. Due to the elimination of the first magnetic gap S1, the magnetic conductive member 14 can transmit more magnetic force to the first moving iron core 161, so that the magnetic force gathering in the second magnetic gap S2 also gradually increases. Thus, the first moving iron core 161 and the second moving iron core 171 move upward together close to the static iron core 13, and the second distance L2 and the second magnetic gap S2 also gradually decrease. During this actuation process, as the first moving iron core 161 preferentially attracts the second moving iron core 171 and the first magnetic gap S1 is eliminated after they are in contact, the second sealing portion 172 gradually moves away from the second valve port 102, and the second valve port 102 is preferentially opened. Thereafter, the first moving iron core 161 drives the second moving iron core 171, the second sleeve portion 162, and the first sealing portion 163 to move upward close to the static iron core 13, and the first valve port 101 is also opened. Thus, both the first valve port 101 and the second valve port 102 are opened, and the electromagnetic drive device is in the fully open state;When the coil component 12 is switched from the energized mode to the de-energized mode, as the electromagnetic force disappears, the first moving iron core 161 starts to disengage from the static iron core 13. The second moving iron core 171 and the first moving iron core 161 are in a state of abutment. The second moving iron core 171 also performs a closing action following the first moving iron core 161. Under the action of the second elastic member 19, i.e., the valve-sealing elasticity, the second core assembly 17 closes the second valve port 102. Similarly, under the valve-sealing action of the first elastic member 20, the first core assembly 16 closes the first valve port 101. Specifically, due to the disappearance of the electromagnetic force and the valve-sealing action of the second elastic member 19, the second moving iron core 171 disengages from the first moving iron core 161, and the second moving iron core 171 drives the second sealing portion 172 downward to close the second valve port 102. At the same time, due to the disappearance of the electromagnetic force and the valve-sealing action of the first elastic member 18, the first sealing portion 163 moves downward to close the first valve port 101. The first moving iron core 161 and the second sleeve portion 162 also move downward accordingly. It should be noted that in order to enable the first core assembly 16 and the second core assembly 17 to close the valve smoothly, the elastic force of the first elastic member 18 is set to be greater than that of the second elastic member 19. If the elastic force of the second elastic member 19 is greater, then in the valve-closed state, the second elastic member 19 can push the first moving iron core 161 upward to disengage it from the second moving iron core 171, so that the first sealing portion 163 cannot close the valve smoothly. Or when set to an equal elastic force state, an upward disengaging force is also applied to the first moving iron core 161, making the first sealing portion 163 unable to close the valve well. In this structure, even if the first core assembly 16 cannot move downward smoothly to close the valve, such as in a state where the first moving iron core 161 is stuck with the first sleeve portion 15, under the valve-sealing elastic action of the second elastic member 19, the second moving iron core can still disengage from the first moving iron core and drive the second sealing portion 172 downward to close the second valve port 102. Or when the second core assembly 17 cannot close the second valve port 102 smoothly, under the valve-sealing force of the first elastic member 18, the first moving iron core 161 can also drive the second sleeve portion 162 and the first sealing portion 163 to move downward to close the first valve port 101 to ensure the safe use of the gas proportional valve and prevent gas leakage.;

[0017] Through the optimized design of the structure 10 of the electromagnetic driving device, there is only a first sleeve portion 15 between the static iron core 13 and the first moving iron core 161, and the relative magnetic resistance is small. When the coil is energized, first, the second moving iron core 171 moves upward against the elastic force of the second elastic member 19. During the upward movement of the second moving iron core 171, due to the action of the magnetic field, the closer the second moving iron core 171 is to the first moving iron core 161, the greater the electromagnetic force it obtains, and the greater the electromagnetic force, the greater the acceleration obtained. When the first moving iron core 161 abuts against the second moving iron core 171, the acceleration and moving speed of the second moving iron core 171 will have a boosting effect on the first moving iron core 161, enabling the first moving iron core 161 to more smoothly open the first valve port 101 with the second sleeve portion 162 and the first sealing portion 163, thereby realizing the smooth valve opening of the first core assembly 16. And under the boosting action of the second moving iron core 171, the force received when the first core assembly 16 opens the valve can come from the acting force of the first moving iron core 161 and the electromagnetic force of the coil portion 12, and the required electromagnetic force can be relatively reduced, which can reduce the amount of coil windings and thus reduce the manufacturing cost.

[0018] The following combines Figure 2 and Figure 3The specific structure of the proportional adjustment device 20 is introduced in detail. The proportional adjustment device 20 includes a receiving cavity B, a static iron core 21, a regulating valve rod 22, a moving iron core 23, and a diaphragm assembly 24. The moving iron core 23 is located in the receiving cavity B. The regulating valve rod 22 can be made of a metal material and fixedly connected to the moving iron core or be an integral structure. The proportional adjustment device further includes a sleeve 28, a housing member 29, and a coil component. The coil component is located on the outer peripheral portion of the static iron core 21. The housing member 29 has magnetic permeability and generally surrounds the coil component. The sleeve 28 is fixedly connected or limitedly connected to the static iron core 21. The sleeve 28 and the static iron core 21 generally define the receiving cavity B. The moving iron core 23 can drive the regulating valve rod 22 to perform axial lifting movement in the receiving cavity B along the sleeve wall of the sleeve 28. The moving iron core 23 is integrally in an inverted convex shape and is located above the static iron core 21. The static iron core 21 is relatively close to the diaphragm assembly 24. When the coil component is energized, under the excitation effect, the moving iron core 23 moves downward as a whole and gradually approaches the static iron core 21. The regulating valve rod 22 moves downward together with the moving iron core 23. When the coil component is de-energized, the excitation effect disappears, the moving iron core 23 moves upward as a whole and gradually moves away from the static iron core 21. The regulating valve rod 22 moves upward together with the moving iron core 23. Specifically, the regulating valve rod 22 includes a body portion, an upper end portion 222, and a lower end portion. The static iron core 21 includes a first recessed portion 211, a first through hole 212, and a second recessed portion 213. The first recessed portion 211 is located at the upper position of the static iron core 21. The second recessed portion 213 is located at the lower position of the static iron core 21. The first through hole 212 can communicate the first recessed portion 211 and the second recessed portion 213. The moving iron core 23 includes a second through hole 231 and a protruding portion 232. The protruding portion 232 is a small-diameter portion with a diameter smaller than the large-diameter portion 233 of the moving iron core 23. The protruding portion 232 is adapted to the first recessed portion 211. When the coil component is energized and under the excitation effect, the moving iron core 23 and the regulating valve rod 22 move downward together and are attracted to the static iron core 21, and the protruding portion 232 can extend into the first recessed portion 211. When the coil component is de-energized and the excitation effect disappears, the moving iron core 23 and the regulating valve rod 22 move upward together and relatively move away from the static iron core 21, and the protruding portion 232 relatively moves away from the first recessed portion 211. The outer peripheral wall of the large-diameter portion 233 of the moving iron core 23 can perform axial movement in the receiving cavity B along the sleeve wall. The first through hole 212 and the second through hole 231 are coaxially arranged. The regulating valve rod 22 can sequentially pass through the second through hole 231, the first recessed portion 211, the first through hole 212, and the second recessed portion 213 from top to bottom. At least part of the body portion 221 is located in the first through hole 212 and the second through hole 231, and the lower end portion 223 is located in the second recessed portion 213. The static iron core 21 further includes a lower end 214, and the lower end 214 is fixedly connected to the housing member 29. The diaphragm assembly 24 includes a sealing portion 241, a diaphragm 242, a spring seat 243, and a spring 244. The lower end of the regulating valve rod 22 is fixedly connected or limitedly connected to the diaphragm assembly 24. In this embodiment, the two are connected by a limiting method.The lower end of the regulating valve rod 22 is embedded in the spring seat and is tightly fitted with it. The spring seat 243 can be made of flexible rubber material. Through flexible deformation, the lower end 223 of the regulating valve rod 22 is tightly connected with the spring seat 243. In addition, the lower end of the regulating valve rod 22 can also be fixedly connected with the diaphragm assembly by interference fit or other means. The spring 244 is sleeved on the protrusion of the sealing part 214, with one end abutted against the spring seat and the other end abutted against the sealing part 214. The spring seat and at least part of the spring 244 are located in the second recess 211. The proportional regulating device 20 further includes a regulating mechanism 40. The regulating mechanism 40 includes a body part 41, a limit regulating rod 42 and a receiving part 43. In this embodiment, the body part and the receiving part are made of plastic parts as an integral structure, and the limit regulating rod is made of metal parts. According to actual needs, the body part or the receiving part can also be made of metal parts. Here, the materials of the various components of the regulating mechanism are not specifically limited. The receiving part 43 is fixedly connected or limit-connected with the housing part 29. The receiving part 43 includes an extension part 431, a flange part 432 and a receiving hole 433. Both the upper end and the lower end of the receiving part 43 are of an open structure. The inside of the receiving part 43 also includes a receiving hole wall, and a first thread part 444 that cooperates with the body part 41 is formed on the receiving hole wall. Specifically, the extension part 431 can be in interference fit with the sleeve 28. The flange part 432 abuts against the outer wall of the housing part 29 so that the whole receiving part 43 can be fixedly connected or limit-connected with the housing part 29. Or it can also be that the flange part 432 and the housing part 29 are provided with corresponding screw holes, and the flange part 432 is fixedly connected with the housing part 29 by tightening the screws. Or it can also be that a protrusion or a recess is provided on the lower bottom surface of the flange part 432, and a corresponding recess or protrusion is provided on the surface of the housing part 29, and the two are limit-connected through the corresponding cooperation of the recess and the protrusion. It is only necessary to fix the whole receiving part to the housing part 29. At least part of the body part 41 is located in the receiving hole 433. If necessary, the upper end of the body part 41 can also extend outside the receiving hole 433. The body part 41 can be integrally processed and formed from plastic or metal. The outer wall of the body part 41 is provided with a second thread part 4121 that is in threaded cooperation with the first thread part 444. The body part 41 is integrally in a cylindrical structure, including a sleeve body 412, a claw part 413, a body receiving cavity 414 and a cooperation part 415. The claw part 413 extends downward and protrudes from the sleeve body 412. The body receiving cavity 414 includes a notch C. Specifically, a generally semi-circular notch C is formed between the sleeve body 412 and the claw part 413. The outer peripheral wall of the cylindrical sleeve body 412 is provided with the second thread part 4121. The claw part 413 is integrally in a C-shaped structure with an opening. The claw part 413 includes an opening 4131, a claw hole 4132 and a claw surface 4133. The upper end 222 of the regulating valve rod 22 is placed into the claw hole 4131 through the opening 4131 and is adapted to it, and can extend into the body receiving cavity 414 through the notch C.The jaw surface 4133 can form a limit for the downward movement of the moving iron core 23 through cooperation with the upper flange portion 2221 of the upper end portion 222. A distance L1 is formed between the first concave bottom surface 211a of the static iron core 21 and the bottom surface 232a of the protruding portion of the moving iron core 23, and a distance L2 is formed between the jaw surface 4133 and the upper flange portion 2221, and L1 is greater than L2. The regulating valve rod 22 and the opening 4131 can drive the moving iron core 23 to perform axial lifting movement through clearance fit. The mating portion 415 includes a mating hole structure in the shape of an internal hexagon and can be used in cooperation with an external L-shaped internal hexagon wrench tool. The body accommodation cavity 414 communicates with the mating hole. Through the threaded engagement of the first threaded portion 444 and the second threaded portion 4121, the body portion 41 moves upward or downward relative to the accommodation portion 43. It should be noted that the mating hole structure of the mating portion can also be other polygonal or irregular-shaped structures as long as it can be used in cooperation with an external wrench to enable the body portion to move upward or downward relative to the accommodation portion.,

[0019] When assembling each component of the proportional adjustment device 20, the body portion 41 of the adjustment mechanism 40 and the limit adjustment rod 42 can be installed. Or first fixedly connect the moving iron core 23 and the regulating valve rod 22 or install them as an integral structure to form a moving iron core valve rod assembly. Then, the upper end portion of the regulating valve rod 22 is placed into the opening 4131 on the side of the jaw portion 413, and then the whole is placed into the accommodation cavity B together, so that the regulating valve rod 22 is aligned with the first through hole 212. Then, each component of the installation diaphragm assembly 24 is loaded in sequence. The upper flange portion 2221 of the regulating valve rod 22 can abut against the limit regulating valve rod 42 under the reset action of the spring 244. The inner peripheral wall of the sleeve body 412 is also provided with a third threaded portion 4122 that cooperates with the limit regulating valve rod 42. At least the limit regulating valve rod 42 is located in the body accommodation cavity 414, and the lower end of the limit regulating valve rod 42 can also extend into the notch C cavity as long as it can abut against the regulating valve rod 22 when energized. The outer peripheral wall of the limit regulating valve rod 42 is provided with a fourth threaded portion 421, and the upper end portion of the limit regulating valve rod 42 is provided with a groove portion that is generally in the shape of a linear depression. Through the threaded engagement of the third threaded portion 4122 and the fourth threaded portion 421, the groove portion cooperates with an external flat-blade screwdriver tool to make the limit regulating valve rod 42 move upward or downward relative to the sleeve body 412. It should be noted that the upper end portion of the limit regulating valve rod can also be provided with other-shaped groove portions for use in cooperation with external tools as long as it is ensured that the limit regulating valve rod can move upward or downward relative to the sleeve body.,

[0020] The proportional adjustment device 20 also includes a magnetic conductive part assembly 50, which includes a first magnetic conductive part 51 and a second magnetic conductive part 52. The first magnetic conductive part 51 is sleeved on the outer periphery of the static iron core 21 and abuts against it, and the second magnetic conductive part 52 is sleeved on the outer periphery of the sleeve 28 and abuts against it. The first magnetic conductive part 51 includes a first straight section and a first flange section, and the second magnetic conductive part 52 includes a second straight section and a second flange section. The first straight section abuts against the outer periphery of the static iron core 21, the first flange section abuts against the skeleton of the coil component and the lower part of the outer shell 29 respectively, and the second straight section abuts against the outer periphery of the sleeve 28. The moving iron core 23 abuts against at least part of the second straight section through the sleeve 28, and the second flange section abuts against the skeleton of the coil component and the upper part of the outer shell 29 respectively. By energizing the proportional adjustment device, under the action of excitation, the magnetic force generated by the coil component is transmitted to the entire outer shell 29, and the lower end 214 of the static iron core 21 abuts against the outer shell 29 is fixedly connected, that is, the static iron core and the shell member have a certain magnetic conductive area, and the magnetic force can be transmitted to the static iron core. By setting the first magnetic conductive part 51, the matching area with the static iron core 21 can be increased to further enhance the magnetic force. Another part of the magnetic force is transmitted to the second magnetic conductive part 52 through the upper shell of the shell member 29. At least part of the second straight section has an indirect offset area with the moving iron core 23. The magnetic force can be transmitted to the moving iron core 23 through the contact area between the second straight section and the moving iron core 23, so that the moving iron core and the static iron core are attracted to each other to actuate the product. The magnetic conductivity of the proportional adjustment device when it is actuated as a whole is enhanced by setting the magnetic conductive part assembly. In addition, in order to enhance the magnetic conductivity of the proportional adjustment device, the adjustment mechanism 40 can also be moved upward to the outside of the shell member 29 as a whole. It is only necessary to ensure that it does not separate from the product as a whole. When the moving iron core 23 and the regulating valve stem 22 move axially upward, they can contact with the upper opening of the shell member 29 to form magnetic conduction.

[0021] The following is a detailed introduction to the operating principle of the ratio regulating device 20, the electromagnetic drive device 10 and the pressure difference regulating device 30 to achieve the high-pressure and low-pressure outlet pressure regulating modes of the gas ratio valve. The gas enters from the inlet 1a of the gas ratio valve, and the electromagnetic drive device 10 controls the gas safety switch function of the gas ratio valve. The first core component 16 of the electromagnetic drive device 10 opens the first valve port 101, and the second core component 17 opens the second valve port 102. The gas enters the main flow channel 1c from the first valve port 101 and the second valve port 102. When the high-pressure outlet pressure regulating mode of the gas ratio valve needs to be realized, The proportional regulating device is energized, and the coil component is energized. Under the action of excitation, the regulating valve stem 22 moves downward with the moving iron core 23 and approaches the static iron core 21, and the regulating valve stem 22 gradually moves away from the limit regulating rod 42, and the protrusion 232 gradually extends into the first recessed portion 211. The regulating valve stem 22 applies a force to the spring 244 through the spring seat 243. The spring 244 is pressed and brings the sealing portion 241 relatively close to the third valve port 103, and the opening of the third valve port 103 decreases accordingly, and the pressure in the flow channel 151 gradually increases. The pressure in the back pressure chamber 31 of the pressure differential regulating device 30 also increases accordingly, and the pressure differential diaphragm 33 The spring force of the main valve spring 34 is overcome to push the differential pressure valve stem so that the main valve sealing part 35 pushes open the main valve port 32, and the opening of the main valve port 32 gradually increases, and the gas flow from the main valve port 32 to the outlet 1b increases, and finally the gas flow to the external combustion chamber increases, realizing a higher outlet pressure regulation mode of the gas proportional valve. The pressure set in the high-pressure outlet pressure mode used by customers is generally 900pa. When the customer needs to adjust the pressure higher or lower than this value to further adjust the gas flow, it can be achieved by adjusting the valve stem 42 and the body 41. Specifically, it can be achieved by the claw surface 4133 is realized by the cooperation with the upper flange part 2221 of the upper end part 222. For example, if the stroke of L1 is set to 1 and the stroke of L2 is set to 0.8, the coil component is energized and under the action of excitation, the regulating valve stem 22 moves downward with the moving iron core 23 close to the static iron core 21, and the upper flange part 2221 of the regulating valve stem 22 and the limit regulating rod 42 begin to separate from the abutting state, and the protrusion 232 gradually extends into the first recessed part 211. Due to the existence of the stroke difference, the protrusion 232 does not completely abut against the first recessed part 211. At this time, the upper flange part 2221 can abut against the claw surface 4133.To prevent the further downward movement of the moving iron core 23, when the customer needs to further adjust the gas according to the actual situation of the system and other occasions, and realizes a higher pressure regulation mode by increasing the gas flow rate under the high-pressure outlet pressure mode, an Allen wrench tool can be used to operate through the opening at the upper end of the accommodating portion 43 and align with the mating hole. Through the threaded engagement of the first threaded portion 444 and the second threaded portion 4121, the entire body portion 41 moves downward relative to the accommodating portion 43, and the claw portion 413 extends out of the accommodating hole 433. Under the action of the energizing electromagnetic force, the regulating valve rod 22 drives the moving iron core 23 to move further downward, and the convex portion 232 further extends into the first recessed portion 211. The regulating valve rod 22 further applies a force to the spring 244 through the spring seat 243. The compressed spring 244 drives the sealing portion 241 to move closer to the third valve port 103, and the opening degree of the third valve port 103 decreases accordingly. The pressure in the flow channel 151 gradually increases, and the pressure in the back pressure chamber 31 of the differential pressure regulating device 30 also increases accordingly. The differential pressure diaphragm 33 overcomes the spring force of the main valve spring 34 and pushes the differential pressure valve rod to push the main valve sealing portion 35 to open the main valve port 32. The opening degree of the main valve port 32 gradually increases, and the gas flow rate flowing from the main valve port 32 to the outlet 1b increases. Eventually, the gas flow rate flowing to the external combustion chamber also further increases, realizing the further adjustment of the gas flow rate by the gas proportional valve under the high-pressure outlet pressure regulation mode to achieve a higher pressure regulation mode; conversely, when the customer needs to further adjust the gas to reduce the gas flow rate under the high-pressure outlet pressure mode according to the actual situation of the system and other occasions, in order to achieve a lower pressure regulation mode under the high-pressure outlet pressure regulation mode, an Allen wrench tool can be used to operate through the opening at the upper end of the accommodating portion 43 and align with the mating hole. Through the threaded engagement of the first threaded portion 444 and the second threaded portion 4121, the entire body portion 41 moves upward relative to the accommodating portion 43. The claw surface 4133 of the claw portion 413 abuts against the upper flange portion, and the body portion 41 drives the regulating valve rod 22 to move upward as a whole. The acting force on the spring seat 243 and the spring 244 weakens. Under the pressure action, the sealing portion 241 moves relatively away from the third valve port 103, and the opening degree of the third valve port 103 increases accordingly. Part of the gas flows from the pressure relief channel 17 to the outlet 1b, and the pressure in the flow channel 151 gradually decreases. The pressure in the back pressure chamber 31 of the differential pressure regulating device 30 also decreases accordingly. The main valve sealing portion 35 approaches the main valve port 32, and the opening degree of the main valve port 32 gradually decreases. The gas flow rate flowing from the main valve port 32 to the outlet 1b decreases. Eventually, the gas flow rate flowing to the external combustion chamber decreases, realizing the further adjustment of the gas flow rate by the gas proportional valve under the high-pressure outlet pressure regulation mode to achieve a lower pressure outlet pressure regulation mode.,

[0022] When it is necessary to implement the low-pressure outlet pressure regulation mode of the gas proportional valve, the proportional regulation device is powered off, the electromagnetic force disappears, the regulating valve stem 22 drives the moving iron core 23 to move relatively away from the static iron core 21, the convex portion 232 gradually moves away from the first concave portion 211, the upper flange portion 2221 of the regulating valve stem 22 is kept in contact with the limit regulating valve stem 42 under the action of the spring 244, the acting force on the spring seat 243 and the spring 244 is weakened, the sealing portion 241 moves relatively away from the third valve port 103, the opening degree of the third valve port 103 increases accordingly, part of the gas flows from the pressure relief channel 17 to the outlet 1b, the pressure in the flow channel 151 gradually decreases, and the pressure in the back pressure chamber 31 of the differential pressure regulating device 30 also decreases accordingly, the opening degree of the main valve port 32 decreases, the gas flow rate flowing from the main valve port 32 to the outlet 1b decreases, and finally the gas flow rate flowing to the external combustion chamber decreases, realizing the low-pressure outlet pressure regulation mode of the gas proportional valve. Generally, the pressure set in the low-pressure outlet pressure mode used by customers during use is 450 Pa. When the customer needs to be higher or lower than this pressure value according to actual needs to further adjust the gas flow rate, a flat-blade screwdriver can be used to cooperate with the groove portion of the limit regulating rod 42 through the upper opening of the accommodating portion and the cooperation hole of the cooperating portion to make the limit regulating rod 42 move upward or downward relative to the sleeve body 412. When it is necessary to increase the gas flow rate regulation under the low-pressure outlet pressure regulation mode according to the system needs to realize a higher-pressure regulation mode under the low-pressure outlet pressure regulation mode, the groove portion can be cooperated with an external flat-blade screwdriver tool, and through the threaded cooperation of the third threaded portion 4122 and the fourth threaded portion 421, the limit regulating rod 42 moves downward relative to the sleeve body 412. The limit regulating rod 42 presses the regulating valve stem 22 to move downward, and the regulating valve stem 22 drives the moving iron core 23 to move downward together to further approach the static iron core 21. The increase in the gas flow rate to realize the higher-pressure outlet pressure regulation mode has been described before and will not be elaborated here one by one. As a result, the gas flow rate finally flowing to the external combustion chamber also increases further, realizing the increase in the gas flow rate regulation of the gas proportional valve under the low-pressure outlet pressure regulation mode to realize a higher pressure regulation mode.Conversely, when it is necessary to reduce the gas flow rate to achieve a lower outlet pressure regulation mode under the low-pressure outlet pressure regulation mode according to the system requirements, the groove part can be cooperated with an external flat screwdriver tool. Through the thread cooperation between the third thread part 4122 and the fourth thread part 421, the limit adjustment rod 42 moves upward relative to the sleeve body 412. Under the action of the spring 244, the regulating valve rod 22 drives the moving iron core 23 upward to continue to abut against the limit adjustment rod 42. The acting forces on the spring seat 243 and the spring 244 are weakened, and the diaphragm assembly 24 moves relatively away from the third valve port 103. The gas flow rate decreases to achieve a lower-pressure outlet pressure regulation mode, which has been described above and will not be elaborated here. As a result, the gas flow rate finally flowing to the external combustion chamber further decreases, realizing the reduction adjustment of the gas flow rate by the gas proportional valve under the low-pressure outlet pressure regulation mode to achieve a lower-pressure outlet pressure regulation mode.

[0023] It should be noted that the flow channel 151 described in the present invention includes a first flow channel 151a, a second flow channel 151b, and a third flow channel 151c. The first flow channel 151a, the second flow channel 151b, and the third flow channel 151c are interconnected. Gas enters the flow channel 151 through the first valve port 101 and the second valve port 102. The increase or decrease of the opening degree of the third valve port 103 can directly affect the change of the pressure in the flow channel 151. The first flow channel 151a is relatively close to the electromagnetic driving device 10 and one end is connected to the second valve port 102. One end of the second flow channel 151b is connected to the third valve port. The third flow channel 151c is relatively close to the differential pressure regulating device 30 and one end is connected to the back pressure chamber 31. Through the flow channel 151, the electromagnetic driving device 10, the proportional regulating device 20, and the differential pressure regulating device 30 can be respectively connected. The gas proportional valve provided by the present invention can achieve the high-pressure or low-pressure outlet pressure regulation mode of the gas proportional valve through the setting of the electromagnetic driving device 10, the proportional regulating device 20, and the differential pressure regulating device 30 and their mutual cooperation.

[0024] When a DC constant current power supply is connected to the proportional regulating device of the gas proportional valve, the outlet pressure of the valve body can be proportionally linearly regulated. The primary pressure, i.e., the gas inlet pressure, is also represented by P1, I represents the current, and P2 represents the secondary pressure, i.e., the outlet pressure. The input power supply of the proportional regulating device is proportional to the outlet pressure of the valve body. That is, the smaller the current, the smaller the compression force of the moving iron core 23 on the diaphragm assembly through the spring, that is, the smaller the opening degree of the main valve port 32. The larger the current, the larger the opening degree of the main valve port 32. By controlling the linearity of the input current of the proportional regulating device, the equal-ratio linear regulation of the outlet pressure of the gas proportional valve can be achieved.

[0025] It should be noted that the key point of the gas proportional valve provided by the present invention lies in protecting the structure of the electromagnetic driving device. The settings of the electromagnetic driving device applied to other structures can be flexibly set according to actual market needs.

[0026] Through the optimized design of the structure of the electromagnetic driving device, the gas proportional valve provided by the present invention can control the opening and closing of two valve ports by one electromagnetic coil, reducing the manufacturing cost of the valve body. At the same time, as an important safety electromagnetic valve structure for controlling the on-off of gas, the electromagnetic driving device can relatively reduce the number of components through the two-stage control mode of setting the first core component and the second core component, making the overall structure of the gas proportional valve simpler, reducing the production cost of the product. In addition, when the first core component fails or the second core component fails, the other core component can still close the valve to prevent gas leakage, ensuring the use safety.

[0027] It should be noted that the ordinal numbers such as "first" and "second" and the orientation words such as "upper" and "lower" mentioned in the present invention are all described based on the accompanying drawings of the specification, and are only naming methods for distinguishing different components, and should not be considered as having relevant order limitations on each component. The above is only the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and retouches can be made, and these improvements and retouches should also be regarded as the protection scope of the present invention.

Claims

1. A gas proportional valve, characterized in that, It includes a body, a first valve port and a second valve port, and also includes an electromagnetic driving device. The electromagnetic driving device includes a static iron core, a first sleeve portion, a first core component, a second core component, a first elastic member and a second elastic member. The first core component includes a first moving iron core, a second sleeve portion and a first sealing portion. The second sleeve portion is fixedly connected or limitedly connected to the first moving iron core. The lower end of the first sleeve portion is fixedly connected or limitedly connected to the first sealing portion. The first elastic member abuts against the first sealing portion. The second core component includes a second moving iron core and a second sealing portion. The lower end portion of the second moving iron core is fixedly connected or limitedly connected to the second sealing portion. The first moving iron core and / or the second moving iron core is provided with a recess, and at least part of the second elastic member is located in the recess and abuts against the first moving iron core at one end and the second moving iron core at the other end; When the electromagnetic driving device is energized, the first moving iron core can drive the second sleeve portion and the first sealing portion to perform an axial upward movement along the first sleeve wall of the first sleeve portion, so that the first sealing portion moves away from the first valve port, the second moving iron core can drive the second sealing portion away from the second valve port, the first moving iron core can abut against the second moving iron core, and the first moving iron core and the second moving iron core approach the static iron core; When the electromagnetic driving device is in a power-off state, the first sealing portion closes the first valve port and the second sealing portion closes the second valve port. A first distance is formed between the first moving iron core and the second moving iron core, and a second distance is formed between the first moving iron core and the closed end of the first sleeve. The first distance is smaller than the second distance.

2. The gas ratio valve according to claim 1, wherein The electromagnetic driving device further includes a magnetic conductive member sleeved on the outer peripheral wall of the first sleeve portion. The magnetic conductive member includes a vertical portion and a flanging portion. The gas ratio valve further includes a housing and a coil component. The coil component includes a bobbin. The inner wall of the vertical portion abuts against the outer peripheral wall, the outer wall of the vertical portion abuts against the bobbin, the flanging portion is clamped between the bobbin and the housing, and the upper end of the flanging portion abuts against the bobbin and the lower end abuts against the lower part of the housing.

3. The gas proportional valve according to claim 1, characterized in that, The electromagnetic driving device further includes a second accommodation cavity defined by the first sleeve portion. At least part of the first core component can perform an axial lifting movement along the first sleeve wall in the second accommodation cavity. The first moving iron core, the second sleeve portion and the first sealing portion define a first accommodation cavity. At least part of the second moving iron core is located in the first accommodation cavity and can perform an axial lifting movement along the second sleeve wall of the second sleeve portion.

4. The gas proportional valve according to claim 3, characterized in that The second moving iron core includes a body portion and a valve stem. The body portion and the valve stem are of an integral structure or the body portion is fixedly connected to the valve stem. The first sealing portion includes an opening, and at least part of the valve stem extends outwards from the opening. The valve stem includes a rod head, and the rod head is fixedly connected or limitedly connected to the second sealing portion.

5. The gas proportional valve according to claim 3, characterized in that, The first sleeve portion includes the closed end and the open end. The open end is provided with an extension portion. The electromagnetic driving device further includes a housing, a coil component, and a seal. The coil component is provided with an inner hole. At least a part of the first sleeve portion is located in the inner hole, and the first sleeve wall is sleeved on the outer periphery of the first moving iron core and at least a part of the second sleeve portion. A part of the extension portion relatively close to the second sleeve portion is clamped between the housing and the first elastic member, and its upper end abuts against the housing and its lower end abuts against the first elastic member. Another part of the extension portion relatively far from the second sleeve portion is clamped between the housing and the seal, and its upper end abuts against the housing and its lower end abuts against the seal.

6. The gas proportional valve according to claim 1, wherein The elastic force of the first elastic member is greater than the elastic force of the second elastic member.

7. The gas proportional valve according to any one of claims 1-6, characterized in that, The gas proportional valve further includes a housing and a coil component. The coil component is provided with an inner hole. At least a part of the static iron core is located in the inner hole. The static iron core is relatively close to the upper part of the housing, and the static iron core is fixedly connected or limitedly connected to the housing. The static iron core includes a recessed portion. The recessed portion includes a bottom wall and a side wall. The closed end is located in the recessed portion and the closed end abuts against the bottom wall or is in contact with the bottom wall. The side wall is relatively close to or in contact with the first sleeve wall.

8. The gas proportional valve according to any one of claims 1-6, characterized in that, The first moving iron core and the second moving iron core are made of soft magnetic materials.

9. The gas ratio valve according to any one of claims 1-6, characterized in that, The gas proportional valve further includes a proportional adjustment device and a differential pressure adjustment device. The proportional adjustment device includes a housing member, a static iron core, a moving iron core, a regulating valve rod, and a diaphragm assembly. The moving iron core is located above the static iron core. The lower end of the regulating valve rod is fixedly connected or limitedly connected to the diaphragm assembly. The regulating valve rod is fixedly connected or is an integral structure with the moving iron core. The moving iron core can drive the regulating valve rod to approach or move away from the static iron core. The proportional adjustment device further includes an adjustment mechanism. The gas proportional valve further includes a third valve port. The diaphragm assembly can approach or move away from the third valve port.

10. The gas proportional valve according to claim 9, characterized in that, The body is provided with a flow channel. The flow channel includes a first flow channel, a second flow channel, and a third flow channel. The first flow channel is close to the electromagnetic driving device and one end thereof is communicated with the second valve port. One end of the second flow channel is communicated with the third valve port. The third flow channel is close to the differential pressure adjustment device and one end of the third flow channel is communicated with the back pressure chamber of the differential pressure adjustment device. The first flow channel, the second flow channel, and the third flow channel are communicated with each other.

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