A gas valve

Abstract

The electromagnetic drive device of the gas valve provided by the present invention includes a first core assembly, a second core assembly, a first elastic member, a second elastic member and a third elastic member. The first core assembly includes a first moving iron core, a first sleeve portion and a first sealing portion. The first sealing portion can close the first valve port. The second core assembly includes a second moving iron core, a valve stem and a second sealing portion. The valve stem can drive the second moving iron core to move downward so that the second sealing portion closes the second valve port. When one of the core assemblies fails and cannot close the valve port, the other can still close the valve port to ensure the safe use of the gas valve.

Description

Technical Field

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

[0002] In order to prevent gas leakage, the gas valves currently on the market usually use at least two valve ports, which are opened or closed by two independent solenoid valves. If one of the valves fails, the other valve can still close the valve port to ensure the safe use of the gas valve. Summary of the invention

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

[0004] The present invention provides a gas valve, comprising a body, a first valve port and a second valve port, and also comprising an electromagnetic drive device, wherein the electromagnetic drive device comprises a first core assembly, a second core assembly, a first elastic member and a second elastic member, the first core assembly comprises a first moving iron core, a first sleeve portion and a first sealing portion, the first sleeve portion is fixedly connected or position-limitedly connected to the first moving iron core, the lower end of the first sleeve portion is fixedly connected or position-limitedly connected to the first sealing portion, the first elastic member abuts against the first sealing portion, the first moving iron core can drive the first sleeve portion and the first sealing portion to approach or move away from the first valve port, and the second core assembly comprises a first moving iron core, a first sleeve portion and a ... The body assembly includes a second moving iron core, a valve stem and a second sealing part. The electromagnetic drive device also includes a first cavity. The second moving iron core is at least partially located in the first cavity and can move axially along the sleeve wall of the first sleeve part. The second moving iron core can be against the first moving iron core. The second moving iron core includes a through hole. At least part of the valve stem is located in the through hole. The lower end of the valve stem is fixedly connected or limit-connected to the second sealing part. The valve stem can drive the second moving iron core to move downward so that the second sealing part closes the second valve port. One end of the second elastic member is against the first moving iron core, and the other end is against the valve stem.

[0005] The electromagnetic drive device of the gas valve provided by the present invention includes a first core assembly, a second core assembly, a first elastic member, a second elastic member and a third elastic member. The first core assembly includes a first moving iron core, a first sleeve portion and a first sealing portion. The first sealing portion can close the first valve port. The second core assembly includes a second moving iron core, a valve stem and a second sealing portion. The valve stem can drive the second moving iron core to move downward so that the second sealing portion closes the second valve port. When one of the core assemblies fails and cannot close the valve port, the other can still close the valve port to ensure the safe use of the gas valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1A cross-sectional view of the overall structure of the electromagnetic drive device for a gas valve according to the first embodiment of the present invention (valve closed state);

[0007] Figure 2 A cross-sectional view of the overall structure of the electromagnetic drive device for a gas valve according to the first embodiment of the present invention (valve opening state);

[0008] Figure 3 A cross-sectional view of the overall structure of the electromagnetic drive device for a gas valve according to a second embodiment of the present invention;

[0009] Figure 4 A sectional view of the overall structure of the electromagnetic drive device for a gas valve according to a third embodiment of the present invention;

[0010] Figure 5 A cross-sectional view of the overall structure of a gas valve using an electromagnetic drive device provided by the present invention;

[0011] Figure 6 A sectional view of the overall structure of a second gas valve using an electromagnetic drive device provided by the present invention; DETAILED DESCRIPTION

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

[0013] The electromagnetic drive device 10 includes an outer sleeve, a coil 12, a first core component 14 and a second core component 15. At least part of the outer sleeve is located in the inner hole of the coil 12. The first core component 14 can approach or move away from the first valve port 101 to open or close it. The second core component 15 can approach or move away from the second valve port 102 to open or close it. When the first core component 14 fails to close the first valve port 101, the second core component 15 can still close the second valve port 102 to ensure the safety of the gas valve and prevent gas leakage. Through the optimized design of the electromagnetic drive device, a two-stage core component is formed to control the valve port separately, so that the overall structure of the gas valve is relatively simple and still can ensure the safety of use.

[0014] Combine the following Figure 1-Figure 2An embodiment of the present invention is described in detail. In this embodiment, the electromagnetic drive device 10 of the gas valve can be fixedly connected to the body 1 by means of screws or the like. The electromagnetic drive device 10 includes a magnetically conductive shell 11, a coil 12, a second static iron core 13b and a second outer sleeve 19b. At least a portion of the second outer sleeve 19b is located in the inner hole of the coil 12. The second outer sleeve 19b and the second static iron core 13b can be fixedly connected by welding or the like, or can be limitedly connected by means of bumping or the like. The second outer sleeve 19b and the second static iron core 13b roughly define a accommodating cavity A of the electromagnetic drive device 10. The second static iron core 13b includes a conical portion 131b. The second outer sleeve 19b is roughly a cylindrical tube with openings on both the upper and lower sides. The upper end of the second outer sleeve 19b is fixedly connected to the outer wall of the second static iron core 13b. The coil skeleton 121 is located at the outer periphery of the second static iron core 13b and the second outer sleeve 19b. The coil 12 is wound on the coil skeleton 121, and the shell 11 roughly covers the coil 12 as a whole. The electromagnetic drive device 10 also includes a first core assembly 14, a second core assembly 15, a first elastic member 16, a second elastic member 17 and a third elastic member 18. The first core assembly 14 includes a first moving iron core 141, a first sleeve portion 142 and a first sealing portion 143. The first moving iron core 141 includes a recessed portion, which is adapted to the conical portion 131b. The first sleeve portion 142 and the first moving iron core 141 can be fixedly connected by welding or the like, or by punching convex points or concave portions on the sleeve wall of the first sleeve portion 142, and setting corresponding convex points or concave portions on the outer peripheral wall of the first moving iron core 141 for position limiting connection. The lower end of the first sleeve portion 142 is fixedly connected or limit-connected with the first sealing portion 143, the first elastic member 16 is against the first sealing portion 143, the first moving iron core 141 can drive the first sleeve portion 142 and the first sealing portion 143 to perform axial lifting and lowering movement in the accommodating chamber A to make the first sealing portion 143 approach or move away from the first valve port 101, the first moving iron core 141 can perform axial lifting and lowering movement along the second outer sleeve wall of the second outer sleeve 19b, the electromagnetic drive device also includes a first cavity, the first sleeve portion 142 and the first sealing portion 143 roughly define the first cavity, and the first sealing portion 143 includes an opening 1432.The second core assembly 15 includes a second moving iron core 151, a valve stem 152 and a second sealing portion 153. The second moving iron core 151 includes a through hole 1511. The second moving iron core 151 is at least partially located in the first cavity and can move axially along the sleeve wall of the first sleeve portion 142 in the first cavity. It should be noted that the small diameter portion 1512 of the second moving iron core 151 can also extend out of the opening 1432. It is only necessary to make the first step 1514 located in the first cavity to position the third elastic member 18. The second moving iron core 151 can move with the first The moving iron core 141 is abutted against each other, and the second moving iron core 151 can be directly fitted and abutted against the first moving iron core 141, or a noise reduction diaphragm can be set between the two for indirect abutment. The lower end of the valve stem 152 is fixedly connected or limit-connected with the second sealing portion 153, and at least part of the valve stem 152 extends into the through hole 1511. The valve stem 152 can drive the second moving iron core 151 to move downward so that the second sealing portion 153 closes the second valve port 102. One end of the second elastic member 17 abuts against the first moving iron core 141, and the other end abuts against the valve stem 152.

[0015] The first valve port 101 and the second valve port 102 are coaxially arranged. To ensure sealing, the second static iron core 13b can be fixedly connected with an O-ring, and the first moving iron core 141 can also be fixedly connected with an O-ring for airtight connection. The second outer sleeve 19b and the first sleeve 142 can be made of non-magnetic materials such as stainless steel or copper formed by stretching and other processes. The first sealing part 143 and the second sealing part 153 can be rubber parts respectively embedded in the flange of the first sleeve 142 and the lower end of the valve stem 152. It should be noted that the present invention The lower end of the first sleeve portion 142 is fixedly connected or limit-connected to the first sealing portion 143, and the lower end of the valve stem 152 is fixedly connected or limit-connected to the second sealing portion 153. In the embodiment provided by the present invention, it is achieved by a limit connection. Specifically, it refers to the flange of the first sleeve 142 or the lower end of the valve stem 152 being squeezed into the rubber part through the flexible deformation of the rubber part to fit tightly therewith. The lower end of the first sleeve portion 142 can also be extended and elongated to perform flangeing to limit the first sealing portion 143, and the two can be fixedly connected by welding or the like.The first sealing portion 143 includes a cap-shaped metal member 1430 and a rubber member 1431. The cap-shaped metal member 1430 roughly covers the rubber member 1431. The first sealing portion 143 also includes a first protrusion 1433 protruding toward the static iron core 13. In this embodiment, one end of the first elastic member 16 is sleeved on the first protrusion 1433 and abuts against its outer periphery, and the other end is sleeved on the shell protrusion of the shell 11. One end of the first elastic member 16 abuts against the first sealing portion 143 and the other end abuts against the shell 11. The first elastic member can directly abut against the first sealing portion or can be abutted against the first sealing portion by adding other components. The first elastic member 16 is a main valve spring. When the valve is in the closed state, it exerts a sealing force on the first sealing portion 143 to keep it in cooperation with the first valve port 101. The valve stem 152 includes an upper rod portion 1521, a flange portion 1522 and a valve stem body 1523. The diameter of the valve stem body 1523 can be set to be larger than the diameter of the upper rod portion 1521. Of course, the valve stem can also be set to an equal-diameter structure with the same upper and lower diameters. The upper rod portion 1521 close to the flange portion 1522 extends into the through hole 1511 and can move axially along the inner wall 151a of the second moving iron core 151. The valve stem body 1523 extends downward from the opening 1432, and the flange portion 1522 protrudes from the upper rod portion 1521 to the outer periphery. At least part of the second elastic member 17 is located in the through hole 1511 and is sleeved on the valve stem 152. One end of the second elastic member 17 abuts against the valve stem 152, and the other end abuts against the first moving iron core 141. Specifically, the second elastic member 17 is sleeved on the second protrusion 1521a of the upper rod portion 1521. One end of the second elastic member 17 abuts against the first end surface 1410 of the lower end of the first moving iron core 141, and the other end abuts against the flange portion 1522. The second elastic member 17 can be used as an auxiliary valve spring. In the closed valve state, A valve-sealing force is applied to the valve stem 152 to keep it in cooperation with the second valve port 102. When the electromagnetic control device is powered off, the first moving iron core 141 and the second moving iron core 151 are separated by the valve-sealing force of the second elastic member 17. At this time, the second elastic member 17 can extend out of the through hole, and when the coil is powered off and the electromagnetic drive device starts to switch from the valve opening mode to the valve closing mode, the valve-sealing force of the auxiliary valve spring causes the second moving iron core 151 and the first moving iron core 141 to be smoothly separated and at the same time, a valve-sealing force is applied to the valve stem 152, so that the valve stem 152 can drive the second moving iron core 151 to move downward smoothly to close the second valve port 102. The second moving iron core 151 also includes a small diameter portion 1512 , a large diameter portion 1513 and a second end face 1516 . The small diameter portion 1512 and the large diameter portion 1513 transition to form a first step 1514 . A second step 1515 is also provided inside the second moving iron core 151 . The second end face 1516 can abut against the first end face 1410 .In the valve closing state, the first sealing portion 143 closes the first valve port 101 and the second sealing portion 153 closes the second valve port 102 , the second end surface 1516 abuts against the first end surface 1410 , and a gap L1 is formed between the flange portion 1522 and the second step 1515 .

[0016] The electromagnetic drive device 10 further includes a third elastic member 18, which is sleeved on the first moving iron core 141 and one end of the third elastic member 18 abuts against the first moving iron core 141 and the other end abuts against the first sealing portion 143. Specifically, the third elastic member 18 is sleeved on the outer periphery of the small diameter portion 1512, and one end of the third elastic member 18 abuts against the first step 1514 and the other end abuts against the bottom wall of the first sealing portion 143. Here, the third elastic member 18 can be used as a reset spring, and the elastic force of the third elastic member 18 is greater than the gravity of the second moving iron core 151. The third elastic member 18 can overcome the gravity of the second moving iron core 151 so that the second moving iron core 151 can be offset against the first moving iron core 141. By setting the third elastic member 18, when the electromagnetic coil is energized, because the first moving iron core 141 is closer to the second moving iron core 151 than the static iron core 13, according to the principle that the closer the distance, the easier it is to attract, the first moving iron core 141 can preferentially attract the second moving iron core 151, thereby driving it to move upward and then driving the second sealing portion 153 to be lifted together to successfully open the second valve port 101.

[0017] Furthermore, the electromagnetic drive device 10 further includes a first magnetizer 20a, which is substantially a cylindrical portion with a flange, and is sleeved on the outer periphery of the second outer sleeve 19b. The first magnetizer 20a includes a first straight section 21a and a first flange section 22a. The lower end surface of the first flange section 22a abuts against the housing 11, and the upper end surface abuts against the coil skeleton 121. The first flange section 22a is embedded in the gap formed between the coil skeleton 121 and the housing 11. The outer wall of the first straight section 21a can be aligned with the coil skeleton 121. 21 fits together. When the coil is energized, a part of the magnetic force is transmitted to the second static iron core 13b through the upper part of the shell 11, and the other part is transmitted to the first moving iron core 141 and the second moving iron core 151 through the lower part of the shell 11. Due to the setting of the first magnetic conductor 20a, the shell 11 has electromagnetic force from the shell protrusion 111 to the first straight section 21a, and the magnetic conductive area is increased, so that the electromagnetic force is increased to form a stronger electromagnetic circuit, so that the first moving iron core 141 drives the second moving iron core 151 to move upward to open the first valve port and the second valve port.

[0018] It should be noted that the third elastic member 18 can also be cancelled in this embodiment. At this time, the second moving iron core 151 can be offset against the step of the valve stem 152 by gravity because it is not affected by the force of the third elastic member 18. In order to ensure that when the electromagnetic coil is energized, the first moving iron core 141 can be smoothly attracted to the second moving iron core 151 so that the second moving iron core 151 drives the valve stem 152 to lift upward and open the second valve port 102, the distance between the first moving iron core 141 and the second moving iron core 151 can be set to be smaller than the distance between the first moving iron core 141 and the static iron core 13, and the same technical effect can still be achieved.

[0019] The following briefly introduces the driving principle of the electromagnetic drive device. Figure 2 The figure shows that the electromagnetic drive device is in the valve closing position state, at this time, the coil 12 is in the power-off state, the first moving iron core 141 is relatively far away from the second static iron core 13b, the first sealing portion 143 closes the first valve port 101, the second sealing portion 153 closes the second valve port 102, and the third elastic member 18 overcomes the gravity of the second moving iron core 151 so that its second end face 1516 is against the first end face 1410 of the first moving iron core 141. When the coil 12 starts to switch to the power-on state, under the influence of the electromagnetic force, the first moving iron core 141 is closer to the second moving iron core 151, so the first moving iron core 141 preferentially attracts the second moving iron core 151, and then the first moving iron core 141 The first sleeve portion 142, the first sealing portion 143 and the second moving iron core 151 are driven to be lifted together toward the second static iron core 13b to overcome the elastic force of the first elastic member 16, i.e., the main valve spring. The first sealing portion 143 opens the first valve port 101. At the same time, as the second moving iron core 151 is lifted upward, the second step 1515 gradually approaches the flange portion 1522. The gap L1 formed between the flange portion 1522 and the second step 1515 gradually disappears until the flange portion 1522 and the second step 1515 are offset. The second moving iron core 151 is lifted upward together with the valve stem 152. The second sealing portion 153 opens the second valve port 102 until a gap L1 is formed between the flange portion 1522 and the second step 1515. Figure 3The first moving iron core 141 and the second static iron core 13b are attracted, and the electromagnetic drive device is in the valve opening position state. It should be noted that the gap L1 is set between the valve stem 152 and the second moving iron core 151 because there is inevitably a position difference in the product during the processing, such as the first valve port 101 and the second valve port 102. When there is no gap L1 between the two, it is very likely that the second valve port 102 will not close the valve in place, thereby posing a safety hazard of gas leakage. The gap L1 is used to eliminate the position difference between the first valve port 101 and the second valve port 102 to ensure the sealing safety of the two valves. In addition, if there is no gap between the two, the valve stem 152 is easy to move downward with the second moving iron core 151. At the moment of power-on, the first moving iron core 141 may be preferentially attracted with the static iron core 13. Due to the fast attraction speed, the second moving iron core 151 cannot respond quickly to follow the movement of the first moving iron core 141, so that the second valve port 102 cannot be opened smoothly.

[0020] like Figure 3 The electromagnetic drive device is in the valve opening position state, at this time, the coil 12 is energized, the first moving iron core 141 and the second static iron core 13b are against each other, the flange portion 1522 and the second step 1515 are against each other, the first moving iron core 141 and the second moving iron core 151 are against each other, the first sealing portion 143 of the valve stem is relatively far away from the first valve port 101, and the second sealing portion 153 is relatively far away from the second valve port 102. When the coil 12 starts to switch to the de-energized state, the first moving iron core 141 and the second static iron core 13b are against each other, the flange portion 1522 and the second step 1515 are against each other, and the first moving iron core 141 and the second moving iron core 151 are against each other. The iron core 13b begins to separate, and the second moving iron core 151 and the first moving iron core 141 are in a state of being attached, so the second moving iron core 151 also performs a closing action with the first moving iron core 141, and the second core assembly 15 is closed before the first core assembly 14 by the force of the second elastic member 17, i.e., the valve sealing elasticity, that is, the second valve port 102 is closed first, and the first valve port 101 is closed later. Under the action of the second elastic member 17, the second moving iron core 151 separates from the first moving iron core 141 to form a certain gap , under the action of the valve closing force applied by the second elastic member 17, the valve stem 152 and the second moving iron core 151 are resisted and drive the second moving iron core 151 to move downward until the second valve port 102 is closed. After the second sealing part 153 closes the second valve port 102, the valve stem 152 remains stationary due to the valve closing effect. Under the action of the first elastic member 16, i.e., the main valve valve closing spring, the first moving iron core 141 pushes the second moving iron core 151 to continue to move downward and gradually eliminates the gap formed between the second moving iron core 151 and the first moving iron core 141, so that the valve stem 152 and the second moving iron core 151 form a gap L1, and finally the first sealing part 143 closes the first valve port 101. It should be noted that the elastic force of the second elastic member 17 needs to be set to be greater than the elastic force of the third elastic member 18. After the second elastic member 17 applies the valve closing force to the valve stem 152, the valve stem 152 can bring the second moving iron core 151 to overcome the elastic force of the third elastic member 18 and move downward smoothly until the second sealing part can close the second valve port 102.

[0021] The gas valve provided by the present invention, when the coil 12 is in the power-off state, if the first moving iron core 141 and the second static iron core 13b cannot be separated and remain attracted to each other or are accidentally stuck, the second moving iron core 151 is separated from the first moving iron core 141 by the valve closing force of the second elastic member 17, and the valve stem 152 can still drive the second moving iron core 151 to move downward until the second sealing portion 153 closes the second valve port 102, that is, when the gas valve is actuated and the first core assembly 14 of the electromagnetic drive device fails, the second core assembly 15 can still close the valve to cut off the flow of gas to ensure safety of use. Similarly, when the second core assembly 15 fails, the first core assembly 14 can still close the valve to cut off the flow of gas.

[0022] Combine the following Figure 3A second embodiment of the gas valve provided by the present invention is described. The difference from the first embodiment lies in the structure near the static iron core. The electromagnetic drive device of the gas valve also includes a first static iron core 13a and a first outer sleeve 19a. The first static iron core 13a can be fixedly connected to the shell 11 by welding or other methods or position-limited connection by dotting or other methods. The first static iron core 13a includes a roughly U-shaped recess 131a and a downwardly extending wall 132a. The first outer sleeve 19a is located in the inner hole of the coil 12 and includes a closed end 191a and an open end 192a. The closed end 191a is adapted to the recess 131a and the closed end 191a forms a clearance fit with the wall 132a. An outer sleeve 19a is formed of a non-magnetic (non-magnetic conductive) metal material and is roughly cylindrical. It is used to guide the axial movement of the first core assembly 14 and ensure the air tightness of the valve body. The first moving iron core 141 can carry the first sleeve portion 142 and the first sealing portion 143 to perform axial lifting and lowering movements along the wall of the first outer sleeve. The electromagnetic drive device includes a accommodating cavity A'. The inner cavity of the first outer sleeve 19a roughly forms the accommodating cavity A'. The electromagnetic drive device 10 is excited by the winding of the coil 12. A ring-shaped closed magnetic circuit can be formed through the outer shell 11, the first magnetic conductive body 20a, the first static iron core 13a, the first moving iron core 141, and the second moving iron core 151. When the coil is energized and excited, the magnetic field passes through the outer shell 1 1 is transmitted to the first magnetizer 20a and the first static iron core 13a, and the magnetic pole at the end of the first magnetizer 20a is transmitted to the first moving iron core 141 and the second moving iron core 151 through the gap. At the moment when the coil 12 is energized and excited, since the distance between the first static iron core 131a and the first moving iron core 141 is relatively close, that is, the first moving iron core 141 is relatively close to the wall portion 132a of the first static iron core 131a and the matching part of the two is roughly U-shaped, it is helpful to improve the initial attraction effect at the moment of power-on, and play a role in guiding the magnetic circuit. The first moving iron core 141 can easily and smoothly attract and approach the first static iron core 131a together with the first sleeve portion 142 and the first sealing portion 143, and the first moving iron core 141 is transmitted through the first moving iron core 141. The electromagnetic field forms a magnetic circuit guide with the wall portion 132a of the first static iron core 131a, and then forms an electromagnetic circuit of attraction with the end face of the first moving iron core 141 through the U-shaped end face. The valve stem 152' in this embodiment includes a flange portion 1522' and a valve stem body 1523'. The flange portion 1522' is located in the through hole 1511 of the second moving iron core 151 and can move axially along the inner wall of the second moving iron core 151. The flange portion 1522' protrudes circumferentially from the valve stem body 1523'. In the closed state, the first sealing portion 143 closes the first valve port 101, and the second sealing portion 153 closes the second valve port 102. A gap is formed between the flange portion 1522' and the second step 1515. The relevant specific structures of the first magnetic conductor 20a, the first core assembly 14, and the second core assembly 15 in this embodiment, as well as the actuation principle in the power-on or power-off state have been described in detail in the first embodiment, and will not be repeated here.

[0023] Combine the following Figure 4 The third embodiment of the gas valve provided by the present invention is described. The difference from the second embodiment is that the static iron core component is cancelled in this embodiment, and a magnetic conductor is used to replace the magnetic conductive function of the static iron core. Specifically, the electromagnetic drive device of the gas valve includes a first magnetic conductor 20a, a second magnetic conductor 20b, a first outer sleeve 19a, a first core assembly 14 and a second core assembly 15. The first magnetic conductor 20a and the second magnetic conductor 20b are both sleeved on the outer periphery of the first outer sleeve 19a. The first magnetic conductor 20a includes a first straight section 21a and a first flange portion 22a. A first gap S1 is formed between the lower end of the coil skeleton 121 and the housing 11, the first flange portion 22a is embedded in the first gap, the first straight section 21a can be against the inner wall of the coil skeleton 121, the second magnetic conductor 20b includes a second straight section 21b, a second flange portion 22b, and a guide hole 23b, the first moving iron core includes a cone portion 24b, a magnetic gap S3 is formed between the cone portion 24b and the second straight section 21b of the second magnetic conductor 20b, the closed end 191a extends into the guide hole 23b, and a second gap S2 is formed between the upper end of the coil skeleton 121 and the housing 11. The second flange portion 22b is embedded in the second gap S2, and the first magnetizer 20a and the second magnetizer 20b are arranged with the same central axis. In this embodiment, the second magnetizer 20b acts as a static iron core. When the coil 12 is energized to generate excitation, an annular closed magnetic circuit is formed by the housing 11, the first magnetizer 20a, the second magnetizer 20b, the first moving iron core 141 and the second moving iron core 151. The electromagnetic field is transmitted to the first magnetizer 20a and the second magnetizer 20b through the housing 11, and the magnetic pole at the end of the first magnetizer 20a is transmitted to the second moving iron core 151. 51 is fitted with the first moving iron core 141, and then transmitted to the first moving iron core 141, and a closed electromagnetic circuit is formed through the magnetic gap S3 formed between the first moving iron core 151 and the second magnet 20b, so that the electromagnetic force on the second magnet 20b attracts the first moving iron core 151, so that the first moving iron core 151 moves toward the second magnet 20b to open the valve. It should be noted that the cone 24b is a diameter-reducing portion that gradually shrinks in diameter toward the housing 11 in the axial direction, and the magnetic gap S3 can enhance the magnetic circuit when the first moving iron core 151 and the second magnet 20b are attracted. The valve stem structure in this embodiment is the same as the second embodiment, and the relevant specific structures of the first core assembly 14 and the second core assembly 15 as well as the actuation principle in the power-on or power-off state have been described in detail in the first embodiment, and will not be repeated here.

[0024] Combine the following Figure 5The first gas valve using the electromagnetic drive device provided by the present invention is introduced. The gas valve also includes a first proportional adjustment device 30 and a pressure difference adjustment device 40. The proportional adjustment device 30 is a single pressure setting structure, including an adjustment nut 31, a compression spring 32, and a pressure adjustment sealing part 33. The compression spring 32 is adjusted by the adjustment nut 31 so that the adjustment sealing part 33 and the third valve port 103 of the gas valve form a flow limiting effect. For example, when the proportional adjustment device 30 is set to a higher pressure, the adjustment sealing part 33 is relatively close to the valve port 103, and the gas affected by the pressure enters the pressure difference adjustment device through the flow channel 105. The back pressure chamber 41 of 40 overcomes the spring force of the valve closing spring 42 to enable the main valve sealing part 43 to open the pressure differential valve port 44, so that the main flow channel gas flows to the combustion appliance for combustion, and the firepower is increased; for example, when the proportional valve regulating device sets a lower pressure, the regulating sealing part 33 is relatively far away from the valve port 103, and under the influence of the pressure, the gas located in the flow channel 105 is discharged outward from 103, the pressure in the back pressure chamber 41 is reduced, and the main valve sealing part is close to the pressure differential valve port 44, the opening is reduced, the gas flowing from the main flow channel gas to the combustion appliance is reduced, and the firepower is reduced. The gas valve is used for a single control device by setting the gas pressure.

[0025] Combine the following Figure 6The second gas valve using the electromagnetic drive device provided by the present invention is introduced. The gas valve includes a second proportional adjustment device 30-1, a third proportional adjustment device 30-2, an electromagnetic control device 50 and a pressure adjustment device 40. The second proportional adjustment device 30-1 and the third proportional adjustment device 30-2 are independently designed side by side. The two can achieve high and low pressure two-stage outlet pressure regulation by cooperating with the electromagnetic control device 50. When the electromagnetic control device 50 is powered off, the fourth valve port 104 is closed, and the gas enters the main gas flow channel 1c in the body from the inlet 1a. The first valve port 101 and the second valve port 102 are opened. After the gas enters the flow channel 105', part of the gas enters the fifth valve port 106 through the channel S1, and the other part of the gas enters the sixth valve port 107 through the channel S2. Because the fourth valve port 104 is closed, the gas entering the fifth valve port 106 cannot be discharged from the fourth valve port 104. Therefore, the second proportional adjustment device 30-1, i.e., the low-pressure outlet adjustment device, does not work, and the high-pressure outlet adjustment device is not used. The third proportional regulating device 30-2 is relatively close to the sixth valve port 107. Under the action of pressure, the gas at S2 is pressurized into the back pressure chamber 41 through the flow channel 105', and the opening of the differential pressure valve port 44 increases, so that the main flow channel gas flows to the combustion device for combustion; on the contrary, when the electromagnetic control device 50 is energized, the movable iron core and the static iron core are attracted, the fourth valve port 104 is in an open state, and the gas enters the main flow channel 1c of the gas body from the inlet 1a, the first valve port 101 and the second valve port 102 are opened, and the gas enters After the flow channel 105', a part of the gas enters the fifth valve port 106 through the channel S1, and the other part of the gas enters the sixth valve port 107 through the channel S2. Because the fourth valve port 104 is open, the gas entering the fifth valve port 106 is discharged through the valve port 104. Under the action of pressure, the pressure of the back pressure chamber 41 is reduced, and the opening of the differential pressure valve port 44 is reduced, so that the gas flowing to the gas appliance for combustion is reduced, that is, when the electromagnetic control device 50 is powered off, the outlet pressure state of the gas valve is HI value, and when powered on, the outlet pressure state is LO value, which is the same as Figure 4 What is different from a single control mode is that in this structure, two-stage flow control is achieved by setting up two proportional adjustment devices and an electromagnetic control device. The spring compression state is adjusted by the ON / OFF stroke of the electromagnetic control device, and the outlet states of the second proportional adjustment device and the third proportional adjustment device are changed to achieve LO / HI two-stage outlet pressure regulation.

[0026] It should be noted that the gas valve provided by the present invention focuses on protecting the structure of the electromagnetic drive device, and the configuration of the electromagnetic drive device applied to other structures can be flexibly configured according to actual market needs.

[0027] The gas valve provided by the present invention can control the opening and closing of two valve ports simultaneously by one electromagnetic coil through the optimized design of the electromagnetic drive device structure, thereby reducing the manufacturing cost of the valve body. At the same time, as an important safety electromagnetic valve structure for controlling the on and off of gas, the electromagnetic drive device can relatively reduce the number of parts by providing a two-stage control mode of a first core component and a second core component, making the overall structure of the gas valve simpler and 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, thereby ensuring safety in use.

[0028] It should be noted that the ordinal numbers such as "first, second" and the directional words such as "upper, lower" mentioned in the present invention are all described based on the drawings in the specification. They are only used to distinguish the naming methods of different components and should not be considered to have any restrictions on the order of the components. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A gas valve, characterized in that: The invention comprises a main body, a first valve port and a second valve port, and also comprises an electromagnetic driving device, wherein the electromagnetic driving device comprises a first core component, a second core component, a first elastic member, a second elastic member and a third elastic member, wherein the first core component comprises a first moving iron core, a first sleeve portion and a first sealing portion, wherein the first sleeve portion is fixedly connected or position-limitedly connected to the first moving iron core, wherein the lower end of the first sleeve portion is fixedly connected or position-limitedly connected to the first sealing portion, wherein the first elastic member abuts against the first sealing portion, wherein the first moving iron core can drive the first sleeve portion and the first sealing portion to approach or move away from the first valve port, wherein the second core component comprises a first moving iron core, a first sleeve portion and a ... The electromagnetic drive device further comprises a first cavity, the second moving iron core is at least partially located in the first cavity and can move axially along the sleeve wall of the first sleeve portion, the second moving iron core can abut against the first moving iron core, the second moving iron core comprises a through hole, the valve stem is at least partially located in the through hole, the lower end of the valve stem is positionally connected or fixedly connected with the second sealing portion, the valve stem can drive the second moving iron core to move downward so that the second sealing portion closes the second valve port, one end of the second elastic member abuts against the first moving iron core, and the other end abuts against the valve stem; The third elastic member is located in the first cavity and is sleeved on the second moving iron core. One end of the third elastic member abuts against the second moving iron core, and the other end abuts against the first sealing portion.

2. The gas valve according to claim 1, characterized in that: The elastic force of the second elastic member is greater than the elastic force of the third elastic member, and the elastic force of the third elastic member is greater than the gravity of the second moving iron core.

3. The gas valve according to claim 1, characterized in that: The electromagnetic drive device also includes an outer sleeve, a coil and a accommodating cavity. The outer sleeve is at least partially located in the inner hole of the coil. The first moving iron core can drive the first sleeve part and the first sealing part to perform axial lifting and lowering movement along the outer sleeve wall of the outer sleeve. The outer sleeve and the first sleeve part are made of non-magnetic material.

4. The gas valve according to claim 3, characterized in that: The electromagnetic drive device includes a first static iron core and an outer shell, the outer sleeve is the first outer sleeve, the first static iron core is fixedly connected or limit-connected to the outer shell, the first static iron core includes a recess and a wall extending downward, the first outer sleeve includes a closed end and an open end, the closed end is adapted to the recess and forms a gap fit with the wall, and the inner cavity of the first outer sleeve forms the accommodating cavity.

5. The gas valve according to claim 3, characterized in that: The electromagnetic drive device includes a first magnetic conductor and a second magnetic conductor. The outer sleeve is the first outer sleeve. The inner cavity of the first outer sleeve forms the accommodating cavity. The first magnetic conductor and the second magnetic conductor are both sleeved on the outer circumference of the first outer sleeve. The first magnetic conductor and the second magnetic conductor are arranged with coaxial axes.

6. The gas valve according to claim 5, characterized in that: The first magnetic conductor includes a first straight section and a first flange section, the electromagnetic drive device includes a magnetically conductive shell, a first gap is formed between the lower end of the coil skeleton of the coil and the shell, the first flange section is embedded in the first gap, the first straight section is in contact with the inner wall of the coil skeleton, the second magnetic conductor includes a second straight section, a second flange section, and a guide hole, the first moving iron core includes a cone section, the first outer sleeve includes a closed end and an open end, the closed end extends into the guide hole, a second gap is formed between the upper end of the coil skeleton and the shell, the second flange section is embedded in the second gap, a magnetic gap is formed between the cone section and the second straight section, and the cone section is a reduced diameter section whose diameter gradually decreases in the axial direction toward the shell.

7. The gas valve according to claim 3, characterized in that: The electromagnetic drive device also includes a second static iron core, the outer sleeve is a second outer sleeve, the second outer sleeve is fixedly connected to the second static iron core, the second outer sleeve and the second static iron core define the accommodating cavity, the second outer sleeve is a cylindrical portion with openings on both the upper and lower parts, the upper end of the second outer sleeve is fixedly connected to the outer wall of the second static iron core, the second static iron core includes a conical portion, the first moving iron core includes a recessed portion, and the conical portion is adapted to the recessed portion.

8. The gas valve according to any one of claims 1 to 7, characterized in that: The second moving iron core includes a small diameter portion and a large diameter portion, the small diameter portion and the large diameter portion form a first step, the third elastic member is sleeved on the outer periphery of the first step and one end is abutted against the first step and the other end is abutted against the bottom wall of the first sealing portion, and the third elastic member can make the second moving iron core abut against the first moving iron core.

9. The gas valve according to any one of claims 1 to 7, characterized in that: When the electromagnetic drive device is in a power-off state, the first sealing portion closes the first valve port, the second sealing portion closes the second valve port, and a gap is formed between the valve stem and the second moving iron core.

10. The gas valve according to claim 9, characterized in that: The valve stem includes an upper rod portion, a flange portion and a valve stem body. The first sealing portion includes an opening. The valve stem body passes through the opening. Part of the upper rod portion extends into the through hole and can move axially along the inner wall of the second moving iron core. The flange portion protrudes outward circumferentially from the upper rod portion. A second step is provided in the second moving iron core. A gap is formed between the flange portion and the second step of the second moving iron core.

11. The gas valve according to claim 10, characterized in that: The upper rod portion further includes a second protrusion, and the second elastic member is sleeved on the outer periphery of the second protrusion and has one end abutting against the flange portion and the other end abutting against the first end surface of the first moving iron core.

12. The gas valve according to claim 9, characterized in that: The valve stem includes a flange portion and a valve stem body, the first sealing portion includes an opening, the valve stem body passes through the opening, the flange portion is located in the through hole and can move axially along the inner wall of the second moving iron core, the flange portion protrudes outward circumferentially from the valve stem body, and a second step is provided in the second moving iron core. In a closed state, the first sealing portion closes the first valve port, and the second sealing portion closes the second valve port, and a gap is formed between the flange portion and the second step of the second moving iron core.

13. The gas valve according to claim 1, characterized in that The gas valve also includes a first proportional adjustment device and a pressure difference adjustment device. The proportional adjustment device is a single pressure setting structure, including an adjusting nut, a compression spring and an adjusting sealing part. The compression spring is adjusted by the adjusting nut so that the adjusting sealing part can form a flow limit with the third valve port.

14. The gas valve according to claim 1, characterized in that The gas valve also includes a second proportional adjustment device, a third proportional adjustment device, an electromagnetic control device and a pressure difference adjustment device. The second proportional adjustment device and the third proportional adjustment device are independently arranged side by side. The second proportional adjustment device and the third proportional adjustment device can achieve high and low pressure two-stage outlet pressure regulation by cooperating with the electromagnetic control device. When the electromagnetic control device is powered off, the fourth valve port is closed, and the third proportional adjustment device achieves high-pressure stage outlet pressure regulation. When the electromagnetic control device is powered on, the fourth valve port is opened, and the second proportional adjustment device achieves low-pressure stage outlet pressure regulation.

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