A gas valve

Abstract

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, the electromagnetic drive device comprising a first core assembly, a second core assembly, a first elastic member and a second elastic member, the first core assembly comprising a first moving iron core, a first sleeve portion, a first sealing portion and a first cavity, a valve stem or a second moving iron core is fixedly connected or limitedly connected with a stopper, the stopper can drive the second moving iron core to move downward or the valve stem can drive the stopper 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, and the overall structure of the gas valve is relatively simple and can ensure safety in use through the optimized design of the electromagnetic drive device.

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. When one valve of the gas valve fails, the other valve can still close the valve port to ensure the safe use of the gas valve.

[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, the electromagnetic drive device comprising a first core assembly, a second core assembly, a first elastic member, a second elastic member, and also comprising a support member, the first core assembly comprising a first moving iron core, a first sleeve portion, and a first sealing portion, the second core assembly comprising a second moving iron core, a valve stem and a second 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 is against the first sealing portion, and the first moving iron core can drive The first sleeve and the first sealing part are close to or away from the first valve port, the second moving iron core can be against the first moving iron core, the lower end of the valve stem is fixedly connected or limit-connected with the second sealing part, the electromagnetic drive device 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 includes a through hole, at least part of the valve stem is located in the through hole, the electromagnetic drive device also includes a stopper, the valve stem is fixedly connected or limit-connected to the stopper, or the second moving iron core is fixedly connected or limit-connected to the stopper, and the valve stem can drive the second moving iron core to move downward through the stopper.

[0005] The gas valve provided by the present invention optimizes the structure of the electromagnetic drive device. When one core component fails and cannot close the valve port, the other core component can still close the valve port to ensure the safety of the gas valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 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;

[0007] Figure 2 for Figure 1 An enlarged view of the valve stem of the gas valve electromagnetic drive device;

[0008] Figure 3 for Figure 1 An enlarged view of a stopper of a gas valve electromagnetic drive device;

[0009] Figure 4 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;

[0010] Figure 5 Another overall structural sectional view of the electromagnetic drive device for a gas valve according to the second embodiment of the present invention;

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

[0012] Figure 7 A sectional view of the overall structure of a second gas valve using an electromagnetic drive device provided by the present invention; DETAILED DESCRIPTION

[0013] like Figure 6 or Figure 7 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.

[0014] 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.

[0015] Combine the following Figure 1An embodiment provided by the present invention is introduced 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 means of welding or the like, or can be limitedly connected by means of marking dots on the sleeve 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 support member. 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 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 movements in the accommodating chamber A so that the first sealing portion 143 approaches or moves away from the first valve port 101, the first moving iron core 141 can perform axial lifting and lowering movements 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 be offset against the first moving iron core 141. It should be noted that the second moving iron core 151 can be directly fitted and offset against the first moving iron core 141, or it can be offset by adding other components such as a noise reduction diaphragm between the two. The lower end of the valve stem 152 is fixedly connected or limit-connected with the second sealing portion 153. It should be noted that the limit connection between the lower end of the valve stem and the second sealing portion and the limit connection between the lower end of the first sleeve portion and the first sealing portion in this embodiment refer to that the first sealing portion 143 and the second sealing portion 153 can be rubber parts, respectively, and the flanges of the first sleeve 142 and the lower end of the valve stem 152 are embedded and fitted, that is, the flange of the first sleeve 142 or the lower end of the valve stem 152 is squeezed into the rubber part through the flexible deformation of the rubber part to fit tightly with it. In addition, the lower end of the first sleeve portion 142 can also be extended and elongated to perform flanges to limit the first sealing portion 143, and the two can be fixedly connected by welding or the like. At least part of the valve stem 152 extends into the through hole 1511, and the second moving iron core 151 can be against the first moving iron core 141. The second moving iron core 151 also includes a small diameter portion 1512 and a large diameter portion 1513. The small diameter portion 1512 and the large diameter portion 1513 transition to form a first step portion 1514. A second step portion 1515 is also provided inside the second moving iron core 151.

[0016] The upper end of the valve stem 152 is provided with a first annular groove 152a. The electromagnetic drive device also includes a stopper. In this embodiment, the stopper 127 is a clamping member. The clamping member is roughly in a C-shaped structure with a notch 1272 at one end. The clamping member is adapted to the first annular groove 152a and clamped on the first annular groove 152a. The clamping member and the valve stem 152 can be fixed by a fixed connection such as a limit connection or welding. The clamping member includes at least two matching shoulders 1271, and the matching shoulders 1271 abut against the peripheral wall of the first annular groove 152a. The two adjacent matching shoulders 1271 There is a gap between them. When the valve is closed, the first sealing part 143 closes the first valve port 101, and the second sealing part 153 closes the second valve port 102. The stopper 127 is fixedly connected or limitedly connected to the valve stem 152 to avoid direct contact with the second moving iron core 151. The valve stem and the second moving iron core are actuated by long-term power on and off. The contact between the two is prone to produce large friction, and the deformation or wear of parts is prone to occur under long-term actuation. The stopper 127 can avoid direct contact between the two, and relatively reduce the deformation or wear of parts caused by repeated actuation. A first gap S1 is formed between the stopper 127 and the second step portion 1515 of the second moving iron core 151. At least part of the second elastic member 17 is located in the through hole 1511, and one end abuts against the first moving iron core 141 and the other end abuts against the stopper 127.

[0017] It should be noted that the first gap S1 is set between the valve stem 152 and the second moving iron core 151 because there will inevitably be 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 first gap S1 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 first gap S1 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 no gap is left between the two, the stopper 127 is likely to move the second moving iron core 151 downward under the action of the second elastic member 17. At the moment of power-on, the first moving iron core 141 may be preferentially attracted to 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, thereby failing to smoothly open the second valve port 102.

[0018] The support member structure is described in detail below. The support member of the electromagnetic drive device of the gas valve provided by the present invention can be a third spring member or a magnetic component structure. When the support member is a magnetic component 50, the magnetic component 50 includes a first magnetic ring 51 and a second magnetic ring 52. The first magnetic ring 51 can be attracted to the first step portion 1514 or the first magnetic ring 51 can be embedded in the concave portion of the first step portion 1514. The second magnetic ring 52 is located on the bottom wall of the first sealing portion 143. The first magnetic ring 51 and the second magnetic ring 52 Relatively speaking, the first magnetic ring 51 includes a first upper magnetic pole 51a and a first lower magnetic pole 51b, and the second magnetic ring 52 includes a second upper magnetic pole 52a and a second lower magnetic pole 52b. The first lower magnetic pole 51b and the second upper magnetic pole 52a are the same magnetic poles, and the first upper magnetic pole 51a and the second lower magnetic pole 52b are the same magnetic poles. In the closed valve state, the first lower magnetic pole 51b and the second upper magnetic pole 52a can generate a repulsive force so that the second moving iron core 151 always maintains a fit with the first moving iron core 141. By setting the magnetic component 50, 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 be attracted to the second moving iron core 151 first, thereby driving it to move upward and then driving the second sealing part 153 to be lifted together to smoothly open the second valve port 101. The repulsive force generated between the same poles of the magnet can make the second moving iron core 151 fit with the first moving iron core 141. The magnetic component that needs to be explained The repulsive force generated between the same levels is greater than the gravity of the second moving iron core, and can support the second moving iron core and overcome the gravity of the second moving iron core so that the second moving iron core and the first moving iron core are offset. The support member can also be set as a third elastic member, and the second moving iron core is kept in contact with the first moving iron core through the spring action of the third elastic member. When set as the third elastic member, one end of the third elastic member is offset against the first sealing part and the other end is offset against the second moving iron core, and the elastic force of the third elastic member is set to be greater than the gravity of the second moving iron core and less than the elastic force of the second elastic member.

[0019] The first valve port 101 and the second valve port 102 are coaxially arranged. To ensure the sealing performance, 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 processes such as stretching. 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. One end of the first elastic member 16 in this embodiment 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, and one end of the first elastic member 16 abuts against the first sealing portion 143 and the other end abuts against the shell 11. It is also possible to add additional components to the first sealing portion to achieve indirect abutment between the first sealing portion and the first elastic member 16. The first elastic member 16 is a main valve spring. When the valve is in the closed state, it exerts a valve sealing force on the first sealing portion 143 to keep it in cooperation with the first valve port 101. In this embodiment, the valve stem 152 also includes an upper stem portion 1521 and a valve stem body 1522. The diameter of the valve stem body 1522 can be set to be larger than the diameter of the upper stem portion 1521. Of course, the valve stem can also be set to an equal-diameter structure with the same upper and lower diameters. The valve stem 1522 extends downward from the opening 1432, at least part of the second elastic member 17 is located in the through hole 1511 and the second elastic member 17 can be used as an auxiliary valve spring. The upper end of the second elastic member 17 abuts against the second movable iron core and the lower end abuts against the stopper 127. In the valve closing state, the stopper 127 applies a sealing force to the valve stem 152 to keep it in cooperation with the second valve port 102. When the coil is energized and the valve is switched from the opening mode to the closing mode, the sealing force of the auxiliary valve spring causes the second movable iron core 151 and the first movable iron core 141 to be smoothly disengaged. Open and at the same time apply a force to the valve stem 152 through the stopper 127, so that the stopper 127 can drive the second moving iron core 151 to move downward smoothly to close the second valve port 102. 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 support member, that is, the third elastic member, or greater than the repulsive force generated by the magnetic component. The elastic force generated by the second elastic member 17 overcomes the elastic force or repulsive force of the third elastic member so that the stopper 127 can move the second moving iron core 151 smoothly downward to close the second valve port 102. In addition, when the second elastic member 17 causes the second moving iron core and the first moving iron core to separate through the valve closing force, the second elastic member 17 can also extend out of the through hole 1511.

[0020] Furthermore, the electromagnetic drive device 10 also includes a first magnetizer 20a, which is roughly a cylindrical portion with a flange, and the first magnetizer 20a 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 flanged portion 22a. The lower end surface of the first flanged portion 22a abuts against the outer shell 11, and the upper end surface abuts against the coil skeleton 121. The first flanged portion 22a is embedded in the gap formed by the coil skeleton 121 and the outer shell 11, and the outer wall of the first straight section 21a can abut against the inner wall of the coil skeleton 121. Against the second outer sleeve 19b, 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 part from the shell protrusion to the first straight section 21a of the shell 11 has electromagnetic force, the magnetic conductive area is increased, and thus the electromagnetic force is increased to form a stronger electromagnetic circuit, so that the first moving iron core 141 can smoothly drive the second moving iron core 151 to move upward to open the first valve port and the second valve port.

[0021] It should be noted that the magnetic component 50 can also be cancelled in this embodiment. In this case, the second moving iron core 151 can be offset against the step of the valve stem 152 due to the action of gravity. 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.

[0022] The following briefly introduces the driving principle of the electromagnetic drive device. Figure 1The figure shows that the electromagnetic drive device is in a valve closing position, at which time the coil 12 is in a 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, and the second sealing portion 153 closes the second valve port 102. The repulsive force generated by the magnetic component 50 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 the first moving iron core 141 drives the first sleeve portion 142 and The first sealing portion 143 and the second moving iron core 151 are 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 portion 1515 gradually approaches the engaging member. The first gap S1 formed between the engaging member and the second step portion 1515 gradually disappears until the engaging member and the second step portion 1515 are offset from each other. 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 the first moving iron core 141 and the second static iron core 13b are attracted to each other, and the electromagnetic drive device forms an open valve position state.

[0023] When the electromagnetic drive device is in the valve opening position, the coil 12 is energized, the first moving iron core 141 abuts against the second static iron core 13b, the stopper 127 abuts against the second step portion 1515, the first moving iron core 141 abuts against the second moving iron core 151, 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 power-off state, the first moving iron core 141 and the second static iron core 13b begin to disengage, and the second moving iron core 151 abuts against the first moving iron core 141. Therefore, the second moving iron core 151 also closes with the first moving iron core 141, and under the action of the second elastic member 17, i.e., the elastic force of the valve sealing member, the second core assembly 15 closes the second valve port before the first core assembly 14, i.e., the second valve port 102 is closed first, and then the first valve port 101 is closed. Under the action of the second elastic member 17, the second moving iron core 151 is separated from the first moving iron core 141 to form a certain gap, and under the action of the valve closing force applied by the second elastic member 17, the stopper 127 is against the second moving iron core 151, and the valve stem 152 drives the second moving iron core 151 to move downward through the stopper 127 until the second valve port 102 is closed. After the second sealing part 153 closes the second valve port 102, the valve stem 152 is kept stationary due to the valve closing effect, and the first moving iron core 141 pushes the second moving iron core 151 to continue to move downward to gradually eliminate the gap formed between the second moving iron core 151 and the first moving iron core 141, so that the stopper 127 and the second moving iron core 151 form a first gap S1, and finally the first sealing part 143 closes the first valve port 101.

[0024] 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 stopper 127 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.

[0025] Combine the following Figure 4A second embodiment of the gas valve provided by the present invention is described, which is different from the first embodiment in the structure near the static iron core part and the installation position of the stopper 127'. 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 by dotting or other methods. The first static iron core 13a includes a roughly U-shaped recess 131a and a downwardly extending wall 132a. At least part of 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. The first outer sleeve 19a is provided with a plurality of holes 191a and 192a. The sleeve 19a is formed of a non-magnetic (non-magnetic) 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 chamber A', and the inner cavity of the first outer sleeve 19a forms the accommodating chamber A'. The electromagnetic drive device 10 is excited by the winding of the coil 12. An annular closed magnetic circuit can be formed through the outer shell 11, the first magnetic conductor 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 is transmitted to the first magnetic conductor 20a and the first static iron core 13 through the outer shell 11. a. 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 fitting part of the two is roughly U-shaped, it helps to improve the initial attraction effect at the moment of power-on and play a role in magnetic circuit guidance. The first moving iron core 141' can easily and smoothly bring the first sleeve portion 142 and the first sealing portion 143 together to the first static iron core 131a. The electromagnetic field transmitted by the first moving iron core 141' forms a magnetic circuit guidance with the wall portion 132a of the first static iron core 131a, and then through the U-shaped end surface An electromagnetic circuit that attracts each other is formed with the end surface of the first moving iron core 141'. 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'. The second moving iron core 151' includes a second annular groove 151a. In this embodiment, the stopper 127' is a snap ring. 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. A gap can be formed between the valve stem 22a and the stopper 127'. Specifically, the stopper 127' is a roughly C-shaped snap ring.The C-shaped retaining ring is compressed and press-fitted into the second annular groove 151a. After assembly, the C-shaped retaining ring is opened and clamped in the second annular groove 151a by its own elastic force. After the limit clamping installation is completed, the retaining ring and the second moving iron core can also be fixedly connected by welding. The C-shaped retaining ring has a center hole, and the valve stem body 1523' passes through the center hole and extends into the through hole 1511. One end of the second elastic member 17 abuts against the first moving iron core 141 and the other end abuts against the flange portion 1522' of the valve stem. When the electromagnetic control device is switched from the open valve state to the closed valve state and the power is cut off, the second elastic member 17 applies a valve sealing force to the valve stem, and the flange portion 1522' of the valve stem 152' can drive the stopper 127' to The second moving iron core 151' is driven downward to make the second sealing part 153 close the second valve port 102. When the electromagnetic control device is powered on to switch from the closed valve state to the open valve state, the first moving iron core 141' and the second moving iron core 151' are attracted, and the first moving iron core 141' drives the second moving iron core 151' to move upward as a whole. The second moving iron core 151' can move upward with the valve stem 152' through the stopper 127' to open the second valve port 102, and then open the first valve port 101. In the closed valve state, the first sealing part 143 closes the first valve port 101, and the second sealing part 153 closes the second valve port 102. The flange part 1522' can form a second gap S2 with the C-shaped retaining ring. 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.

[0026] Combine the following Figure 5The third embodiment of the electromagnetic drive device structure 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. In addition, the structure of the first moving iron core 141" is also changed to a certain extent. 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. The coil A third gap L1 is formed between the lower end of the skeleton 121 and the shell 11, the first flange portion 22a is embedded in the third gap L1, the first straight section 21a can fit with the inner wall of the coil skeleton 121, the second magnet 20b includes a second straight section 21b, a second flange portion 22b, and a guide hole 23b, the first moving iron core 141" also includes a cone portion, a magnetic gap S3 is formed between the cone portion and the second magnet 20b, the closed end 191a extends into the guide hole 23b, a fourth gap L2 is formed between the upper end of the coil skeleton 121 and the shell 11, the second flange portion 22b is embedded in the fourth gap L2, the first magnet 20a and the second magnet 20b are coaxial In this embodiment, the second magnetizer 20b acts as a static iron core. When the coil 12 is energized to generate excitation, a ring-shaped closed magnetic circuit is formed through 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. The magnetic pole at the end of the first magnetizer 20a is transmitted to the second moving iron core 151'. Because the second moving iron core 151' fits the first moving iron core 141", it is 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 141" and the second magnetizer 20b. The electromagnetic force on the second magnet 20b attracts the first moving iron core 141", so that the first moving iron core 141" moves toward the second magnet 20b to open the valve. It should be noted that the cone portion is a reduced diameter portion that gradually reduces in diameter in the axial direction toward the housing 11, and the magnetic gap S3 can enhance the magnetic circuit when the first moving iron core 141" and the second magnet 20b are attracted. The stopper 127' and the valve stem 152' in this embodiment have been described in detail in the second embodiment. The relevant specific structures of the first core assembly 14 and the second core assembly 15 as well as the actuating principles in the power-on or power-off state have been described in detail in the first embodiment, and will not be repeated here.

[0027] Combine the following Figure 6The 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.

[0028] Combine the following Figure 7The 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 third proportional adjustment device 30-2, i.e., the high-pressure outlet adjustment device, does not work. The 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 to enter 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 appliance 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 in the body from the inlet 1a, the first valve port 101 and the second valve port 102 are opened, and the gas enters the flow channel 1 After 05', 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 in 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 a high pressure value, and when powered on, the outlet pressure state is a low pressure 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 high-pressure and low-pressure two-stage outlet pressure regulation.

[0029] 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.

[0030] 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 product 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.

[0031] 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 supporting member, the first core component comprises a first moving iron core, a first sleeve portion and a first sealing portion, the second core component comprises a second moving iron core, a valve stem and a second 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 and the first sealing portion to approach or move away from the first valve port, and the second moving iron core can drive the first sleeve and the first sealing portion to approach or move away from the first valve port. The iron core can be against the first moving iron core, the lower end of the valve stem is fixedly connected or limitedly connected to the second sealing part, the second sealing part can approach or move away from the second valve port, the electromagnetic drive device 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 includes a through hole, at least part of the valve stem is located in the through hole, the electromagnetic drive device also includes a stopper, the valve stem is fixedly connected or limitedly connected to the stopper, or the second moving iron core is fixedly connected or limitedly connected to the stopper, and the valve stem can drive the second moving iron core to move downward through the stopper; The second elastic member is at least partially located in the through hole, one end of the second elastic member abuts against the first elastic member, and the other end of the second elastic member abuts against the valve stem or the stopper; The supporting member is a magnetic component, the elastic force of the second elastic member is greater than the repulsive force generated by the magnetic component, and the repulsive force generated by the magnetic component is greater than the gravity of the second moving iron core, or the supporting member is a third elastic member, one end of the third elastic member is against the first sealing portion, and the other end is against the second moving iron core, 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.

2. The gas valve according to claim 1, characterized in that: A gap may be formed between the valve stem and the stopper, or the gap may be formed between the stopper and the second moving iron core.

3. The gas valve according to claim 2, characterized in that: The valve stem includes a first annular groove, and the stopper is a clamping member, which is clamped in the first annular groove. One end of the second elastic member abuts against the clamping member and the other end abuts against the first moving iron core. The second moving iron core includes a second step portion. The valve stem can abut against the second step portion through the clamping member to drive the second moving iron core to move downward, so that the second sealing portion closes the second valve port.

4. The gas valve according to claim 3, characterized in that: The engaging member comprises at least two matching shoulders, the matching shoulders match the peripheral wall of the first annular groove, and a notch is provided between two adjacent matching shoulders.

5. The gas valve according to claim 4, characterized in that: In the valve closing state, the first sealing portion closes the first valve port, the second sealing portion closes the second valve port, and a first gap is formed between the engaging member and the second step portion.

6. The gas valve according to claim 2, characterized in that: The second moving iron core includes a second annular groove, the stopper is a retaining ring, the retaining ring is press-fitted into the second annular groove, the retaining ring has a center hole, at least part of the valve stem extends into the through hole through the center hole, the valve stem includes a flange portion, one end of the second elastic member abuts against the first moving iron core, and the other end abuts against the flange portion, and the valve stem can drive the second moving iron core to move downward through the retaining ring so that the second sealing portion closes the second valve port.

7. The gas valve according to claim 6, characterized in that: The retaining ring is a C-type retaining ring, which is adapted to the second annular groove. When in the valve closed state, the first sealing portion closes the first valve port, the second sealing portion closes the second valve port, and a second gap is formed between the flange portion and the C-type retaining ring.

8. The gas valve according to claim 1, characterized in that: The magnetic assembly includes a first magnetic ring and a second magnetic ring. The first magnetic ring is attracted to the second moving iron core or the first magnetic ring is embedded in a recessed portion of the second moving iron core. The second magnetic ring is located on a bottom wall of the first sealing portion.

9. The gas valve according to claim 8, characterized in that: The first magnetic ring and the second magnetic ring are arranged opposite to each other, the first magnetic ring includes a first upper magnetic pole and a first lower magnetic pole, the second magnetic ring includes a second upper magnetic pole and a second lower magnetic pole, the first lower magnetic pole and the second upper magnetic pole are the same poles, and the repulsive force generated by the first magnetic ring and the second magnetic ring can make the second moving iron core fit with the first moving iron core.

10. The gas valve according to any one of claims 1 to 7, 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.

11. The gas valve according to any one of claims 1 to 7, 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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