A gas proportional valve

Abstract

The gas proportional valve provided by the present invention includes a first spring and an adjusting mechanism through an optimized design of a proportional adjustment device. The adjusting mechanism includes a main body and a limit adjustment rod. The gas flow rate under the low-pressure outlet pressure mode of the gas proportional valve is regulated by the threaded cooperation between the main body and the static iron core and by the threaded cooperation between the limit adjustment rod and the main body. The overall structure of the gas proportional valve is relatively simple and the gas flow rate can be regulated under two outlet pressure adjustment modes.

Description

Technical Field

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

[0002] The gas proportional valves currently on the market generally include a safety control device, an electromagnetic drive device, a proportional adjustment device and a pressure difference adjustment device, wherein the safety control device is used to control the opening and safe closing of the gas channel, and is usually opened or closed by two independent solenoid valves corresponding to the two valve ports to prevent gas leakage. The electromagnetic drive device cooperates with two independently set proportional adjustment devices to control the opening of the pressure difference valve of the pressure difference adjustment device, thereby realizing the high-pressure or low-pressure outlet pressure adjustment mode of the gas proportional valve. Summary of the invention

[0003] The main purpose of the present invention is to provide a gas proportional valve with a new structure, which can further adjust the gas flow rate based on the high-pressure or low-pressure outlet pressure mode.

[0004] The present invention provides a gas proportional valve, comprising a proportional adjustment device, the proportional adjustment device comprising a static iron core, a moving iron core, a regulating valve stem and a diaphragm assembly, the lower end of the regulating valve stem is fixedly connected or limit-connected to the diaphragm assembly, the regulating valve stem is fixedly connected to the moving iron core or is an integrated structure, the moving iron core can bring the regulating valve stem close to or away from the static iron core, the proportional adjustment device also comprises a first spring and an adjustment mechanism, the static iron core comprises a static iron core accommodating chamber, the adjustment mechanism is at least partially located in the static iron core accommodating chamber, the adjustment mechanism comprises a main body and a limit adjustment rod, one end of the first spring is against the regulating valve stem, and the other end is against the main body, the main body comprises a main body through hole, the limit adjustment rod is at least partially located in the main body through hole, the regulating valve stem can be against the limit adjustment rod, the inner wall of the static iron core is provided with a first threaded portion, the outer wall of the main body is provided with a second threaded portion, the first threaded portion is threadedly matched with the second threaded portion, the inner wall of the main body is provided with a third threaded portion, the outer wall of the limit adjustment rod is provided with a fourth threaded portion, the third threaded portion is threadedly matched with the fourth threaded portion.

[0005] The gas proportional valve provided by the present invention can further adjust the gas flow rate in the high-pressure or low-pressure outlet pressure adjustment mode by adding an adjustment mechanism to the proportional adjustment device. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 A schematic cross-sectional structure diagram of a safety control device of a first structure of a gas proportional valve provided by the present invention in a valve-closed state;

[0007] Figure 2 A schematic cross-sectional structure diagram of a safety control device of a first structure of a gas proportional valve provided by the present invention in a valve-opening state;

[0008] Figure 3 A schematic cross-sectional structure diagram of a safety control device of a second structure of a gas proportional valve provided by the present invention;

[0009] Figure 4 A schematic cross-sectional structure diagram of a third structure of a safety control device for a gas proportional valve provided by the present invention;

[0010] Figure 5 A schematic cross-sectional structure diagram of a proportional adjustment device for a gas proportional valve provided by the present invention;

[0011] Figure 6 Applications provided by the present invention Figure 1 Schematic diagram of the overall structure of the gas proportional valve; DETAILED DESCRIPTION

[0012] like Figure 6 The gas proportional valve shown includes a body 1, an inlet 1a and an outlet 1b. A gas main flow 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 provided with a first valve port 101, a second valve port 102, and a third valve port 103. The gas proportional valve also includes a safety drive device 10, a ratio adjustment device 20 and a pressure difference adjustment device 30. The safety drive device 10, the ratio adjustment device 20 and the pressure difference adjustment device 30 can be fixedly connected to the body 1.

[0013] The safety control device 10 includes a first core assembly 14 and a second core assembly 15. The first core assembly 14 can close the first valve port 101, and the second core assembly 15 can close the second valve port 102. The safety drive device 10 cooperates with the first valve port 101 and the second valve port 102 to form a double-valve electromagnetic control mechanism, which is an important control component of the gas channel of the gas proportional valve, and is used to control the opening and safe closing of the gas channel, and can effectively prevent gas leakage. The proportional adjustment device 20 includes a static iron core 21, a regulating valve stem 22, a moving iron core 23 and a diaphragm assembly 24, the regulating valve stem 22 is fixedly connected with the moving iron core 23 or is an integrated structure. When the outlet pressure of the gas proportional valve needs to be adjusted, the gas enters from the inlet 1a, the first core assembly 14 is relatively far away from the first valve port 101, and the second core assembly 15 is relatively far away from the second valve port 102. The gas enters the gas main flow channel 1c from the first valve port 101 and the second valve port 102. When the power is on, the regulating valve stem 22 can bring the moving iron core 23 close to the static iron core 21 under the excitation of the electromagnetic coil, and the diaphragm assembly 24 is relatively far away from the third valve port 103. Under the pressure, the pressure in the channel 151 The pressure in the back pressure chamber 31 of the pressure differential regulating device 30 decreases, the opening of the main valve port 32 decreases, and the gas flow from the main valve port 32 to the outlet 1b decreases to form a relatively low outlet pressure regulation. When a higher outlet pressure regulation is required, the proportional regulating device 20 is powered off, the electromagnetic force disappears, the regulating valve stem 22 gradually moves away from the static iron core 21 with the moving iron core 23, and the diaphragm assembly 24 is relatively close to the third valve port 103. Under the action of pressure, the pressure in the channel 151 increases, the pressure in the back pressure chamber 31 increases, and the pressure differential diaphragm 33 overcomes the action of the main valve spring 34 so that The main valve sealing portion 35 gradually opens the main valve port 32, the opening of the main valve port 32 increases, and the gas flow rate flowing from the main valve port 32 to the outlet 1b is reduced to form a relatively high outlet pressure regulation. The present invention integrates the two independent proportional adjustment devices of the background technology with the cooperation of the safety drive device. After the gas enters from the first valve port 101 and the second valve port 102, the gas flow rate can be proportionally adjusted and controlled directly through the proportional adjustment device. The gas proportional valve mechanism provided by the present invention makes the overall structure of the gas proportional valve simple and optimized, and can realize the regulation of two outlet pressures.

[0014] Combine the following Figure 1The structure of the safety drive device 10 is introduced in detail, including an outer sleeve, a coil 12, a first core component 14 and a second core component 15. 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 proportional valve and prevent gas leakage. Through the optimized design of the safety drive device, a two-stage core component is formed to control the valve port separately, which can relatively reduce the number of safety valves, so that the overall structure of the gas proportional valve is relatively simple and can still ensure safety in use.

[0015] Combine the following Figure 1 as well as Figure 2An embodiment of the present invention is described in detail. In this embodiment, a safety drive device 10 of a gas proportional valve can be fixedly connected to a main body 1 by means of screws or the like. The safety drive device 10 comprises a magnetically conductive shell 11, a coil 12, a second static iron core 13b and a second outer sleeve 19b. The second outer sleeve 19b is located in the inner hole of the coil 12. The second outer sleeve 19b is fixedly connected or limit-connected to the second static iron core 13b. The second outer sleeve 19b and the second static iron core 13b roughly define a accommodating cavity A of the safety drive device 10. The second static iron core 13b comprises a conical portion 131b. The second outer sleeve 19b is roughly a cylindrical tube with openings at both the top and the bottom. 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. The shell 11 roughly covers the coil 12 as a whole. The safety drive device 10 also includes a first core assembly 14, a second core assembly 15, a first elastic member 16 and a second elastic member 17. 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, wherein the first sleeve portion 142 is fixedly connected to the first moving iron core 141, the lower end of the first sleeve portion 142 is engaged with the first sealing portion 143, and the first elastic member 16 is engaged with the first elastic member 17. A sealing part 143 is abutted against each other, and the first moving iron core 141 can drive the first sleeve part 142 and the first sealing part 143 to perform axial lifting and lowering movement in the accommodating chamber A to make the first sealing part 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 first core body assembly 14 includes a first cavity, and the first sleeve part 142 and the first sealing part 143 roughly define the first cavity. The first sealing part 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. At least part of the second moving iron core 151 is located in the first cavity and can move axially along the sleeve wall of the first sleeve portion 142 in the first cavity. The second moving iron core 151 can abut against the first moving iron core 141. The lower end of the valve stem 152 is engaged with the second sealing portion 153. 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. At least part of the second elastic member 17 is located in the through hole 1511 and 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.

[0016] Specifically, 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 and the second sealing portion 153 can be rubber parts that are respectively embedded and fitted with the flange of the first sleeve 142 and the lower end of the valve stem 152. It should be noted that the limiting connection between the first sleeve portion and the first sealing portion or the limiting connection between the valve stem and the second sealing portion stated in this embodiment refers to the flange of the first sleeve 142 or the lower end of the valve stem 152. The rubber member is squeezed into the rubber member through the flexible deformation effect to fit tightly with it, or the first sleeve 142 can be extended and elongated to be set into a flange shape to clamp the first sealing part, or the lower end of the first sleeve 142 can be set into an outer flange shape and fixedly connected with the cap-shaped metal member 1430 by welding or the like. The first sealing part 143 includes a cap-shaped metal member 1430 and a rubber member 1431, and the cap-shaped metal member 1430 roughly covers the rubber member 1431. The first sealing part 143 also includes a first protrusion 1433 protruding toward the static iron core 13. One end of the first elastic member 16 is sleeved on the outer periphery of the first protrusion 1433, and the other end is sleeved on the outer shell protrusion of the outer shell 11, and one end of the first elastic member 16 is sleeved on the first sealing part 143. The other end abuts against the housing 11. The first elastic member 16 is the 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 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. The second elastic member 17 is located at the through hole 151 1 and is sleeved on the valve stem 152, one end of the second elastic member 17 is against the valve stem 152, and the other end is 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 is against the first end surface 1410 of the lower end portion of the first moving iron core 141, and the other end is against the flange portion 1522. The second elastic member 17 can be used as an auxiliary valve spring. In the valve closing state, the valve stem 152 is applied with a sealing force to keep it in cooperation with the second valve port 102. When the coil is energized and starts to switch from the valve opening mode to the valve closing mode, the valve sealing force of the auxiliary valve spring is used to smoothly disengage the second moving iron core 151 and the first moving iron core 141 and simultaneously apply a sealing force to the valve stem 152.Thus, 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 form a first step 1514 in transition. 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. When the valve is closed, 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 face 1516 abuts against the first end face 1410, and a gap L1 is formed between the flange portion 1522 and the second step 1515.

[0017] The safety 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 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.

[0018] Furthermore, the safety 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, and the first flange section 22a is embedded in the gap formed between the coil skeleton 121 and the housing 11, and the outer wall of the first straight section 21a can be aligned with the coil skeleton 121. 21 are offset from each other. 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.

[0019] 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.

[0020] The driving principle of the safety driving device is briefly introduced below. As shown in the figure, the safety driving device is in the valve closing position. 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. Then, the first movable iron core 141 drives the first sleeve portion 142, the first sealing portion 143 and the second movable iron core 151 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, and the first sealing portion 143 opens the first valve port 101. At the same time, as the second movable iron core 151 is lifted upward, the second step 1515 gradually approaches the flange portion 1522, and 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 against each other, and the second movable iron core 151 is lifted upward together with the valve stem 152, and 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 3 The first moving iron core 141 and the second static iron core 13b are attracted, and the safety 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.

[0021] When the safety drive device is in the valve opening position, the coil 12 is energized, the first moving iron core 141 and the second static iron core 13b are abutted against each other, the flange portion 1522 and the second step 1515 are abutted against each other, the first moving iron core 141 and the second moving iron core 151 are abutted 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 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 and the first moving iron core 141 are in abutment with each other. Therefore, the second moving iron core 151 also performs a closing action with the first moving iron core 141, and under the action of the second elastic member 17, i.e., the valve sealing elasticity, the second core assembly 15 must close before the first core assembly 1 4, that is, the second valve port 102 is closed first, and the first valve port 101 is closed. Under the action of the second elastic member 17, the second movable iron core 151 is separated from the first movable 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 valve stem 152 abuts against the second movable iron core 151 and drives the second movable iron core 151 to move downward until the second valve port 102 is closed. After the second sealing portion 153 closes the second valve port 102, the valve stem 152 is kept stationary due to the valve closing effect, and the first movable iron core 141 pushes the second movable iron core 151 to continue to move downward to gradually eliminate the gap formed between the second movable iron core 151 and the first movable iron core 141, so that the valve stem 152 and the second movable iron core 151 form a gap L1, and finally the first sealing portion 143 closes the first valve port 101.

[0022] It should be noted that other corresponding changes can be made to the safety drive device near the static iron core.

[0023] Combine the following Figure 3The structure of the second safety control device of the gas proportional valve provided by the present invention is described. The difference from the above-mentioned safety drive control device lies in the structure near the static iron core part. The safety drive device of the gas proportional valve also includes a first static iron core 13a and a first outer sleeve 19a. The first static iron core 13a can be riveted or fixedly connected to the outer shell 11 in other ways. 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 and the wall 132a form a clearance fit. The first outer sleeve 19a is formed of a non-magnetic (non-magnetic conductive) metal material and is roughly cylindrical in shape. 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 safety drive device includes a accommodating chamber A', and the static iron core accommodating chamber of the first outer sleeve 19a forms the accommodating chamber A'. The safety 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 passes through the outer The shell 11 is transmitted to the first magnetic conductor 20a and the first static iron core 13a, and the magnetic pole at the end of the first magnetic conductor 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 increase the initial attraction force 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 bring the first sleeve portion 142 and the first sealing portion 143 together to the first static iron core 131a. The electromagnetic field of the conductor 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.

[0024] Combine the following Figure 4 The structure of the third safety control device of the gas proportional valve provided by the present invention is described. The difference from the structure of the second safety control device is that the static iron core component is cancelled in this embodiment, and a magnetic conductor is used to replace the magnetic conductivity of the static iron core. Specifically, the safety drive device of the gas proportional 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 magnetic gap S3 is formed between the upper end of the coil skeleton 121 and the housing 11. There is a second gap S2, and the second flange portion 22b is embedded in the second gap S2. The first magnet 20a and the second magnet 20b are arranged with the same central axis. In this embodiment, the second magnet 20b is equivalent to the 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 magnet 20a, the second magnet 20b, the first moving iron core 141 and the second moving iron core 151. The electromagnetic field is transmitted to the first magnet 20a and the second magnet 20b through the housing 11, and the magnetic pole at the end of the first magnet 20a is transmitted to the second moving iron core 151. The moving iron core 151 is against 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 part that gradually decreases 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.

[0025] The gas proportional 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 proportional valve is actuated and the first core assembly 14 of the safety 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.

[0026] Combine the following Figure 5 and Figure 6 The specific structure of the proportional adjustment device 20 is introduced in detail. The proportional adjustment device 20 includes a receiving hole, a static iron core 21', a regulating valve stem 22, a moving iron core 23' and a diaphragm assembly 24. At least part of the static iron core 21' and at least part of the moving iron core 23' and the regulating valve stem 22 are located in the receiving hole. The regulating valve stem 22 can be fixedly connected to the moving iron core with a metal material or be an integrated structure. The proportional adjustment device 20 also includes a shell member 29, a coil component, and a sleeve. The coil component is located at the outer periphery of the static iron core 21' and the moving iron core 23'. The shell member 29 roughly covers the coil component. The upper end of the static iron core 21' can be fixedly connected to the shell member by riveting or welding. The sleeve can be fixedly connected or limit-connected to the static iron core 21'. The moving iron core 23 can carry the 'regulating valve stem 22' to perform axial lifting and lowering movement along the sleeve wall in the receiving hole. The static iron core 21' includes a recessed portion 21a ', the proportional adjustment device 20 also includes a first spring 25' and a second spring 26, the first spring 25' is at least partially located in the recessed portion 21a', and one end is sleeved on the raised portion of the regulating valve stem 22, the lower end of the regulating valve stem 22 can be fixedly connected or limit-connected with the diaphragm assembly 24, the diaphragm assembly 24 includes a diaphragm 241, a sealing portion 242, a second spring 26 and a spring seat 27, in this embodiment, the regulating valve stem 22 is connected to the diaphragm assembly 24 by a limit-connecting manner, the lower end of the regulating valve stem 22 is embedded in the spring seat 27, the spring seat 27 is made of a flexible rubber material, the lower end of the regulating valve stem 22 is embedded in the spring seat 27 to achieve a tight fit therewith, in addition, the lower end of the regulating valve stem 22 can also be fixedly connected to the diaphragm assembly 24 by interference fit or the like, one end of the second spring 26 abuts against the spring seat 27 and the other end abuts against the sealing portion 242.

[0027] The proportion regulating device 20 of the gas proportion valve provided by the present invention is further provided with a regulating mechanism 40 inside. Specifically, the proportion regulating mechanism 20 includes a static iron core 21', a regulating valve stem 22, a moving iron core 23', a spring seat 27 and a diaphragm assembly 24. The static iron core 21' is located above the moving iron core 23' and the static iron core 21' and the outer shell 29 can be fixedly connected by welding or riveting. The static iron core 21' is generally a cylindrical structure with an opening on the top. The static iron core 21' includes a static iron core accommodating cavity 21'a. The regulating mechanism 40 is at least partially located in the static iron core accommodating cavity 21a'. The upper part of the regulating structure 40 can also be extended out of the static iron core The accommodating cavity 21a', the static iron core 21'a also includes a recess 21'b and a guide hole portion 21'c, at least part of the regulating valve stem 22 passes through the guide hole of the guide hole portion 21'c and extends into the static iron core accommodating cavity 21'a, the guide hole portion 21'c can provide a guiding effect on the regulating valve stem 22, the recess 21'b is connected with the guide hole 21'c, the recess 21'b is formed at the lower position of the guide hole 21'c, the moving iron core 23' includes a boss 23'a protruding toward the static iron core 21', the moving iron core 23' can move upward with the regulating valve stem 22 to abut against the static iron core 21', and the recess 21'b is adapted to the boss 23'a.The inner wall of the static iron core 21' is also formed with a first threaded portion 21'd. The adjustment mechanism 40 includes a main body 41 and a limit adjustment rod 42. The main body 41 can be integrally formed by plastic or metal. The outer wall of the main body 41 is provided with a second threaded portion 411, and the second threaded portion 411 is threadedly matched with the first threaded portion 21'd. The inner wall of the main body 41 is provided with a third threaded portion 412. The main body 41 also includes a main body through hole 413 and a matching portion 414. The matching portion 414 includes a matching hole structure in the form of an inner hexagon, which can be used in conjunction with an L-shaped inner hexagon wrench tool. Through the thread of the second threaded portion 411 and the first threaded portion 21'd, the third threaded portion 412 is provided. The body 41 cooperates to make the body part 41 move downward or upward relative to the static iron core 21', the body through hole 413 is connected with the matching hole, the body part 41 also includes a lower end recess 415, and the lower end recess 415 is provided with a step surface. One end of the first spring 25' abuts against the body part 41 and the other end abuts against the regulating valve stem 22. Specifically, the upper end of the first spring 25' abuts against the step surface and the other end is sleeved on the raised portion of the regulating valve stem 22 and abuts against the step portion of the regulating valve stem 22. It should be noted that the abutment here includes the first spring 25' directly abutting against the body part and the regulating valve stem, and also includes indirect abutment with the two. When indirect abutment is performed, other components can be added to achieve The limit adjustment rod 42 is now at odds with the body and the regulating valve stem, the limit adjustment rod 42 is at least partially located in the body through hole 413, and the other part of the limit adjustment rod 42 can also extend into the lower end recess 415 of the body. It is only necessary to ensure that the lower end of the limit adjustment rod 42 can be at odds with the regulating valve stem 22 when the proportional adjustment device is powered on. The limit adjustment rod 42 is roughly an inverted convex screw structure and a fourth threaded portion 42a is provided on the outer periphery. The fourth threaded portion 42a is threadedly matched with the third threaded portion 412. The upper end of the limit adjustment rod 42 is provided with a groove portion that is roughly in the shape of a straight line. The groove portion can be matched with an external straight screwdriver tool and is connected to the third threaded portion 412 through the fourth threaded portion 42a. The threaded portion 412 is threadedly matched to enable the limit adjustment rod 42 to move downward relative to the body portion 41. The proportional adjustment device 20 also includes a receiving hole B, a shell member 29, a coil component, and a sleeve 28'. The coil component is located at the outer periphery of the static iron core 21' and the movable iron core 23'. The shell member 29 generally covers the coil component. At least part of the static iron core 21', the regulating valve stem 22, and the movable iron core 23' are located in the receiving hole B. It should be noted that the upper end of the static iron core 21' riveted and fixed to the shell member 29 can be relatively located above the receiving hole B. In the power-off state, the regulating valve stem 22 can move downward with the movable iron core 23' and can exceed the receiving hole B. The sleeve 28' is fixedly connected to the static iron core 21', and the regulating valve stem 22 can move axially along the sleeve wall in the receiving hole B with the movable iron core 23'.

[0028] The proportional adjustment device 20 also includes a magnetic conductive component, which includes a first magnetic conductive component 20a' and a second magnetic conductive component 20b'. The first magnetic conductive component 20a' and the second magnetic conductive component 20b' are generally in a sleeve structure with a flange. The first magnetic conductive component 20a' is relatively close to the lower position of the outer shell 29 and is sleeved on the outer periphery of the sleeve 28. The second magnetic conductive component 20b' is relatively close to the upper position of the outer shell 29 and is sleeved on the outer periphery of the static iron core 21'. The first magnetic conductive component 20a' includes a first straight section 201a' and a first flange 20 2a', the second magnetic conductive member 20b' includes a second straight section 201b' and a second flanged portion 202b', the coil component includes a coil skeleton AA, a third gap S3 is formed between the coil skeleton AA and the upper portion of the shell member 29, a fourth gap S4 is formed between the coil skeleton AA and the lower portion of the shell member 29, the first flanged portion 202a' is embedded in the fourth gap S4 and respectively abuts against the coil skeleton AA and the shell member 29, and the second flanged portion 202b' is embedded in the third gap S3 and respectively abuts against the coil skeleton AA and the shell member 29. The magnetic conductive component can enhance the conduction of magnetic force, and electromagnetically conduct the two poles (S / N poles) of the coil to the static iron core 21' and the moving iron core 23', respectively, and can enhance the magnetic permeability between the iron core and the coil.

[0029] Combine the following Figure 6Specifically describe the principle of the coordinated action of the proportional regulating device and the pressure difference regulating device 30 to realize the high-pressure or low-pressure outlet pressure regulating mode of the gas proportional valve. The first core assembly 14 of the safety control device 10 opens the first valve port 101, and the second core assembly 15 opens the second valve port 102. The gas enters from the inlet 1a through the first valve port 101 and the second valve port 102 and enters the gas main flow channel 1c. When the proportional regulating device 20 is powered off, the electromagnetic force disappears, and the moving iron core 23' moves the regulating valve stem 22 away from the static iron core 21'. Under the valve sealing force of the first spring 25', the regulating valve stem 22 moves downward together with the moving iron core 23', and the sealing portion 242 of the diaphragm assembly 24 is relatively close to the third The opening of the valve port 103 and the third valve port 103 decreases accordingly, and the pressure in the flow channel 151 increases accordingly under the pressure, and the pressure in the back pressure chamber 31 of the pressure differential regulating device 30 also increases accordingly. The pressure differential diaphragm 33 overcomes the spring force of the main valve spring 34 and pushes the pressure differential valve stem to make the main valve sealing part 35 push open the main valve port 32, and the gas flow rate flowing out of the main valve port 32 increases, thereby realizing a higher outlet pressure regulating mode. According to the system occasion or the actual use needs of the customer, the gas flow rate can be further adjusted on this basis to realize a higher pressure outlet pressure regulating mode. The external L-shaped hexagonal wrench tool can be manually used to match the opening of the static iron core 21' with the matching hole of the matching part 414, through The threaded action causes the main body 41 to move downward relative to the static iron core 21'. Because one end of the first spring 25' is in contact with the step surface of the main body 41, the first spring 25' is compressed after being pushed by the main body 41, thereby exerting a force on the regulating valve stem 22. The regulating valve stem 22 moves further downward with the moving iron core 23', and the diaphragm assembly 24 moves accordingly. The diaphragm assembly 24 approaches the third valve port 103, and the opening of the third valve port 103 decreases, the pressure in the flow channel 151 increases, the pressure in the back pressure chamber 31 increases, and the gas flow rate flowing out of the main valve port 32 is further increased to achieve a higher pressure outlet pressure regulation mode; on the contrary, when the customer needs to achieve a relatively small flow regulation in the high-pressure outlet pressure regulation mode During the regulating valve opening, the main body 41 moves upward relative to the static iron core 21' through the threaded cooperation, the thrust of the main body 41 on the first spring 25' is reduced, the pressure is smaller, and the force acting on the regulating valve stem 22 is also reduced, the spring force of the second spring 26 is relatively weakened, the diaphragm assembly 24 is relatively away from the third valve port 103, the opening of the third valve port 103 is increased, the pressure in the flow channel 151 is reduced, the pressure in the back pressure chamber 31 is reduced, and the gas flow out of the main valve port 32 is further reduced, that is, the threaded cooperation between the second threaded portion 411 of the main body 41 and the first threaded portion 21d' of the static iron core 21' can control the precise regulation of the gas flow in the higher outlet pressure mode of the gas proportional valve.

[0030] When the proportional regulating device 20 is powered on, the moving iron core 23' brings the regulating valve stem 22 toward the static iron core 21' until the concave portion 21'b abuts against the convex platform 23'a, the first spring 25' is compressed, the regulating valve stem 22 can abut against the limit regulating rod 42, the spring seat 27 also moves upward with the moving iron core 23', the spring force of the second spring 26 located between the spring seat 27 and the diaphragm assembly 24 is weakened, and the opening of the third valve port 103 changes accordingly. The opening of the third valve port 103 increases, the pressure in the flow channel 151 decreases, and the pressure in the back pressure chamber 31 of the differential pressure regulating device 30 also decreases accordingly, and the main valve port 3 2 gradually decreases, and the gas flow from the main valve port 32 to the outlet 1b decreases accordingly to achieve a lower outlet pressure regulation mode. According to the system occasion or the actual use needs of the customer, if it is necessary to increase the outlet pressure on the basis of a lower outlet pressure to increase the gas flow, a tool such as a flat-head screwdriver can be manually used to cooperate with the groove of the limit adjustment rod 42, and the limit adjustment rod 42 is moved downward relative to the main body 41 through the threaded cooperation, so that the lower end of the limit adjustment rod 42 abuts against the upper end of the regulating valve stem 22, so that the regulating valve stem 22 moves downward with the moving iron core 23' to separate from the static iron core 21', and the sealing portion 24 2 is relatively close to the third valve port 103, the opening of the third valve port 103 is reduced, the pressure in the flow channel 151 is relatively increased, and the pressure in the back pressure chamber 31 of the differential pressure regulating device 30 is also increased. The differential pressure diaphragm 33 overcomes the spring force of the main valve spring 34 to push the differential pressure valve stem so that the main valve sealing part 35 pushes the main valve port 32, and the gas flow rate flowing out of the main valve port 32 is increased. Conversely, according to the actual use needs of the customer, if it is necessary to reduce the outlet pressure and reduce the gas flow rate on the basis of a lower outlet pressure, the limit adjustment rod 42 can be moved upward relative to the body part 41 through the threaded cooperation, and the sealing part 242 is relatively away from the third valve port 103. 3, the opening of the third valve port 103 increases accordingly, the pressure of the flow channel 151 and the back pressure chamber 31 decreases, and the gas flow rate flowing out of the main valve port 32 decreases relatively, that is, the third threaded portion 412 of the regulating mechanism 40 and the fourth threaded portion 42a of the limit regulating rod can cooperate with each other to control the precise regulation of the gas flow rate in the lower outlet pressure mode of the gas proportional valve. The regulating mechanism 40, as a precise regulating element of the proportional regulating device 20, can adjust the gas proportional valve to the most ideal outlet pressure state mode, and can effectively improve the regulation accuracy of the gas flow rate in the high-pressure or low-pressure outlet pressure mode to meet various needs of customers.

[0031] It should be noted that the flow channel 151 of the gas proportional valve provided by the present invention includes a first flow channel 151a, a second flow channel 151b and a third flow channel 151c, and the first flow channel 151a, the second flow channel 151b and the third flow channel 151c are connected to each other. The gas enters the flow channel 151 from the first valve port 101 and the second valve port 102, and the pressure change in the flow channel 151 is affected by the increase or decrease of the opening of the third valve port 103. The first flow channel 151a is relatively close to the safety control device 10 and one end is connected to the second valve port 102, and the second flow channel 151b is relatively close to the safety control device 10 and one end is connected to the second valve port 102. The end is connected with the third valve port, the third flow channel 151c is relatively close to the pressure difference regulating device 30 and one end is connected with the back pressure chamber 31, and the safety control device 10, the proportional regulating device 20 and the pressure difference regulating device 30 can be connected respectively through the flow channel 151. The gas proportional valve provided by the present invention can realize a high-pressure or low-pressure outlet pressure regulating mode by setting the safety control device 10, the proportional regulating device 20 and the pressure difference regulating device 30 and cooperating with each other, so that the overall structure of the gas proportional valve is optimized, the overall structure is simpler, and two outlet pressure regulation modes can be realized.

[0032] The present invention integrates two independent proportional adjustment devices of the background technology with the cooperation of the safety drive device. After the gas enters from the first valve port 101 and the second valve port 102, the gas flow rate can be directly proportionally adjusted and controlled through the proportional adjustment device. Compared with the gas proportional valve structure of the background technology, the number of proportional adjustment devices is relatively reduced. The gas proportional valve mechanism provided by the present invention makes the overall structure of the gas proportional valve simple and optimized, and can realize the adjustment of two outlet pressures. At the same time, the adjustment mechanism 40 added in the proportional adjustment device serves as a precise adjustment element of the proportional adjustment device 20, which can adjust the gas proportional valve to the most ideal outlet pressure state mode, and can effectively improve the adjustment accuracy of the gas flow in the high-pressure or low-pressure outlet pressure mode to meet various customer needs.

[0033] It should be noted that the gas proportional valve provided by the present invention focuses on protecting the structure of the proportional adjustment device and the cooperation between the proportional adjustment device and the pressure difference adjustment device to achieve the adjustment of two outlet pressure modes. The structure and practical application of the safety drive device can be flexibly set according to actual market needs.

[0034] 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 proportional valve, characterized in that: The invention comprises a proportional adjustment device and a pressure difference adjustment device, wherein the proportional adjustment device comprises a static iron core, a moving iron core, a regulating valve stem and a diaphragm assembly, wherein the lower end of the regulating valve stem is fixedly connected or limitedly connected to the diaphragm assembly, the regulating valve stem is fixedly connected to the moving iron core or is an integrated structure, the moving iron core can bring the regulating valve stem close to or away from the static iron core, the proportional adjustment device also comprises a first spring and an adjustment mechanism, the static iron core comprises a static iron core accommodating cavity, the adjustment mechanism is at least partially located in the static iron core accommodating cavity, the adjustment mechanism comprises a main body and a limit An adjusting rod, one end of the first spring is against the adjusting valve stem, and the other end is against the main body, the main body includes a main body through hole, the limit adjusting rod is at least partially located in the main body through hole, the adjusting valve stem can be against the limit adjusting rod, the inner wall of the static iron core is provided with a first threaded portion, the outer wall of the main body is provided with a second threaded portion, the first threaded portion is threadedly matched with the second threaded portion, the inner wall of the main body is provided with a third threaded portion, the outer wall of the limit adjusting rod is provided with a fourth threaded portion, the third threaded portion is threadedly matched with the fourth threaded portion.

2. The gas proportional valve according to claim 1, characterized in that: The main body can move upward or downward relative to the static iron core through the threaded cooperation between the first threaded portion and the second threaded portion, and the limit adjustment rod can move upward or downward relative to the main body through the threaded cooperation between the third threaded portion and the fourth threaded portion.

3. The gas proportional valve according to claim 2, characterized in that: The main body is integrally formed of plastic or metal, and the main body also includes a matching portion and a lower end recess. The main body through hole is connected to the matching hole of the matching portion. The matching portion includes a hexagonal matching hole structure. The matching hole can be used in conjunction with a hexagonal wrench to enable the main body to move downward or upward relative to the static iron core. The lower end recess is provided with a step surface, and one end of the first spring is sleeved on the raised portion of the adjusting rod, and the other end is against the step surface.

4. The gas proportional valve according to claim 2, characterized in that: The limit adjustment rod is a screw structure that is roughly in the shape of an inverted convex letter A and has the fourth threaded portion on its outer periphery. The end of the limit adjustment rod is provided with a straight-line concave groove portion, and the groove portion can cooperate with a straight-line tool to enable the limit adjustment rod to move downward or upward relative to the main body portion.

5. The gas proportional valve according to any one of claims 1 to 4, characterized in that: The static iron core is a cylindrical structure with an opening at the top, and the static iron core also includes a recess and a guide portion. At least a portion of the regulating valve stem passes through the guide hole of the guide portion and extends into the static iron core accommodating cavity. The guide portion provides a guiding effect on the regulating valve stem. The moving iron core includes a boss protruding toward the static iron core. The moving iron core can carry the regulating valve stem to move upward to counteract the static iron core, and the boss is adapted to the recess.

6. The gas proportional valve according to any one of claims 1 to 4, characterized in that: The proportional adjustment device also includes a magnetic conductive component, which includes a first magnetic conductive part and a second magnetic conductive part. The first magnetic conductive part is sleeved on the outer periphery of the sleeve of the proportional adjustment device, and the second magnetic conductive part is sleeved on the outer periphery of the static iron core.

7. The gas proportional valve according to claim 6, characterized in that: The first magnetic conductive part includes a first straight section and a first flanged portion, the second magnetic conductive part includes a second straight section and a second flanged portion, the proportional adjustment device also includes a coil winding and a shell component, a third gap is formed between the coil skeleton of the coil winding and the upper portion of the shell component, a fourth gap is formed between the coil skeleton and the lower portion of the shell component, the first flanged portion is embedded in the fourth gap and respectively abuts against the coil skeleton and the shell component, and the second flanged portion is embedded in the third gap and respectively abuts against the coil skeleton and the shell component.

8. The gas proportional valve according to any one of claims 1 to 4, characterized in that: The main body also includes an inlet, an outlet, a first valve port, a second valve port, a third valve port and a main valve port. When the safety control device is powered on and the proportional adjustment device is powered off, the gas enters the first valve port and the second valve port from the inlet and then enters the main gas flow channel. The regulating valve stem brings the moving iron core relatively away from the static iron core, and the sealing portion of the diaphragm assembly is close to the third valve port. The opening of the third valve port is reduced, the pressure in the flow channel is increased, the back pressure chamber pressure of the pressure difference regulating device is increased, and the gas flow rate flowing out of the main valve port is increased. A hexagonal wrench is used to act through the opening and the mating portion of the static iron core. The threaded mating action of the first threaded portion and the second threaded portion causes the main body to move upward or downward relative to the static iron core. The threaded mating action of the main body and the static iron core can realize gas flow regulation in the high-pressure outlet pressure mode.

9. The gas proportional valve according to any one of claims 1 to 4, characterized in that: The body also includes an inlet, an outlet, a first valve port, a second valve port, a third valve port and a main valve port. When the safety control device is powered on and the proportional adjustment device is powered on, the gas enters the first valve port and the second valve port from the inlet and then enters the main gas flow channel. The regulating valve stem brings the moving iron core relatively close to the sealing portion of the diaphragm assembly away from the third valve port, the opening of the third valve port increases, the pressure in the flow channel decreases, the back pressure chamber pressure of the pressure difference adjustment device decreases, and the gas flow rate flowing out of the main valve port decreases. A flat-head screw tool is used to cooperate with the groove portion of the limit adjustment rod, and the limit adjustment rod is moved upward or downward relative to the main body through the threaded cooperation of the third threaded portion and the fourth threaded portion. The gas flow rate in the low-pressure outlet pressure mode can be adjusted through the threaded cooperation of the third threaded portion and the fourth threaded portion.

10. The gas proportional valve according to any one of claims 1 to 4, characterized in that: The proportional adjustment device also includes an outer shell, a coil component and a sleeve. The coil component is located at the outer periphery of the static iron core and the moving iron core. The outer shell covers the coil component. The sleeve is fixedly connected to the static iron core. The regulating valve stem can carry the moving iron core to perform axial lifting and lowering movements along the sleeve wall of the sleeve.

11. The gas proportional valve according to claim 1, characterized in that: The gas proportional valve also includes a safety control device, the gas proportional valve includes a body, a first valve port, a second valve port, and a third valve port, the gas proportional valve also includes a flow channel, the flow channel includes a first flow channel, a second flow channel, and a third flow channel, the first flow channel, the second flow channel, and the third flow channel are interconnected, the gas enters the flow channel from the first valve port and the second valve port, the first flow channel is relatively close to the safety control device and one end is connected to the second valve port, one end of the second flow channel is connected to the third valve port, the third flow channel is relatively close to the pressure difference regulating device and one end is connected to the back pressure chamber of the pressure difference regulating device.

12. The gas proportional valve according to claim 1, characterized in that: The gas proportional valve also includes a safety control device, which includes a first core assembly and a second core assembly. The safety control device also includes a housing chamber, a housing, a coil, a second static iron core and a second outer sleeve. The second static iron core is fixedly connected to the second outer sleeve. The gas proportional valve is provided with a first valve port and a second valve port. The first core assembly includes a first moving iron core, a first sleeve portion and a first sealing portion. The first sleeve portion is fixedly connected to the first moving iron core. The lower end of the first sleeve portion is engaged with the first sealing portion. The first moving iron core can drive the first sleeve and the first sealing portion to move along the first sleeve portion in the housing chamber. The second outer sleeve wall of the second outer sleeve moves axially to make the first sealing part approach or move away from the first valve port. The first core body assembly includes a first cavity, and the second core body assembly includes a second moving iron core, a valve stem and a second sealing part. The second moving iron core includes a through hole. The second moving iron core is 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 lower end of the valve stem is embedded in the second sealing part, and at least part of the valve stem extends into the through hole. The valve stem can drive the second moving iron core to move downward to make the second sealing part close the second valve port.

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