A gas proportional valve

Abstract

The gas proportional valve provided by the present invention, through the optimized design of the proportional adjustment device, includes an adjustment mechanism. The adjustment mechanism includes a body part, a limit adjustment rod and a receiving part. The receiving part is in threaded cooperation with the body part, and the limit adjustment rod is in threaded cooperation with the body part. The valve rod extends into the body receiving cavity and can abut against the limit adjustment rod. This gas proportional valve can further adjust the gas flow on the basis of realizing the high and low pressure outlet pressure modes.

Description

Technical Field

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

[0002] At present, the gas proportional valves on the market generally include a safety control device, an electromagnetic drive device, a proportional adjustment device, and a differential pressure adjustment device. Among them, the safety control device is used to control the opening and safe closing of the gas passage. Usually, two independent solenoid valves are used to open or close two valve ports to prevent gas leakage. The electromagnetic drive device cooperates with two independently arranged proportional adjustment devices respectively to control the opening degree of the differential pressure valve of the differential pressure adjustment device, so as to realize the high-pressure or low-pressure outlet pressure adjustment mode of the gas proportional valve. Summary of the Invention

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

[0004] The present invention provides a gas proportional valve, including a proportional adjustment device. The proportional adjustment device includes a housing member, a stationary iron core, a moving iron core, an adjusting valve rod, and a diaphragm assembly. The moving iron core is located above the stationary iron core. The lower end of the adjusting valve rod is fixedly connected or limitedly connected to the diaphragm assembly. The adjusting valve rod is fixedly connected or integrally formed with the moving iron core. The moving iron core can bring the adjusting valve rod closer to or farther away from the stationary iron core. The proportional adjustment device further includes an adjustment mechanism. The adjustment mechanism includes a body part, a limit adjustment rod, and a receiving part. The adjusting valve rod can abut against the body part and the body part can drive the adjusting valve rod to move upward. The receiving part is fixedly connected or limitedly connected to the housing member. The receiving part includes a first threaded part. The outer wall of the body part is provided with a second threaded part. The first threaded part is in threaded cooperation with the second threaded part. The body part includes a body receiving cavity. At least part of the position adjustment rod is located in the body receiving cavity. At least part of the adjusting valve rod extends into the body receiving cavity and can abut against the limit adjustment rod. The inner wall of the body part is provided with a third threaded part. The outer peripheral wall of the limit adjustment rod is provided with a fourth threaded part. The third threaded part is in threaded cooperation with the fourth threaded part.

[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 arranging an adjustment mechanism on the proportional adjustment device. Brief Description of the Drawings

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

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

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

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

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

[0011] Figure 6 For Figure 5 Schematic perspective view of the main body part of the proportional adjustment device;

[0012] Figure 7 For the application provided by the present invention Figure 4 Schematic overall structure diagram of the gas proportional valve with the

[0013] Figure 8 For Figure 5 Enlarged schematic view of the proportional adjustment device Specific embodiments

[0014] Such as Figure 7 The gas proportional valve shown includes a main body 1, an inlet 1a, and an outlet 1b. A main gas flow channel 1c is formed in the main body 1. Gas flows in from the inlet 1a and out from the outlet 1b. The main body 1 can be formed by die-casting aluminum alloy. The main 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 further includes a safety driving device 10, a proportional adjustment device 20, and a differential pressure adjustment device 30. The safety driving device 10, the proportional adjustment device 20, and the differential pressure adjustment device 30 can be fixedly connected to the main body 1.

[0015] 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 passage of the gas proportional valve, used to control the opening and safe closing of the gas passage, and can effectively prevent gas leakage. The proportional adjustment device 20 includes a housing member 29, a static iron core 21, a regulating valve rod 22, a moving iron core 23 and a diaphragm assembly 24. The regulating valve rod 22 is fixedly connected to or integrally formed with the moving iron core 23. The moving iron core 23 is located above the static iron core 21, and the static iron core 21 is relatively close to the diaphragm assembly 24. The regulating valve rod 22 is fixedly connected to or integrally formed with the moving iron core 23. The regulating valve rod 22 can bring the moving iron core 23 closer to or farther away from the static iron core 21. The proportional adjustment device further includes an adjustment mechanism 40. The adjustment mechanism includes a body portion 41, a limit adjustment rod 42 and a receiving portion 43. The regulating valve rod 22 can abut against the body portion 41, and the body portion 41 can drive the regulating valve rod 22 to move upward. The receiving portion 43 is fixedly connected to or limitedly connected to the housing member 29. The interior of the receiving portion 43 has a receiving hole wall, and a first thread portion 444 is formed on the receiving hole wall. The body portion 41 is located in the receiving hole 433 of the receiving portion. A second thread portion 4121 is provided on the outer wall of the body portion 41. The first thread portion 444 can be screwed with the second thread portion 4121. The body portion 41 includes a body receiving cavity 414. At least part of the limit adjustment rod 42 is located in the body receiving cavity 414. At least part of the regulating valve rod 22 extends into the body receiving cavity 414 and can abut against the limit adjustment rod 42. A third thread portion 4122 is provided on the inner wall of the body portion 41, and a fourth thread portion 421 is provided on the outer peripheral wall of the limit adjustment rod 42. The third thread portion 412 can be screwed with the fourth thread portion 421.

[0016] When it is necessary to implement the high - pressure or low - pressure outlet pressure adjustment mode of the gas proportional valve, gas enters from the inlet 1a. The first core assembly 14 moves relatively away from the first valve port 101, and the second core assembly 15 moves relatively away from the second valve port 102. The gas enters the gas main channel 1c from the first valve port 101 and the second valve port 102. In the energized state, under the excitation of the electromagnetic coil, the regulating valve stem 22 can move the moving iron core 23 closer to the static iron core 21 together. The diaphragm assembly 24 moves relatively closer to the third valve port 103. Under the action of pressure, the pressure in the channel 151 increases, and the pressure in the back - pressure chamber 31 increases. The differential - pressure diaphragm 33 overcomes the acting force of the main valve spring 34 to gradually open the main valve sealing part 35 of the main valve port 32. The opening degree of the main valve port 32 increases, and the gas flow rate flowing from the main valve port 32 to the outlet 1b increases to form a relatively high outlet pressure adjustment. On the contrary, when powered off, the regulating valve stem 22 moves the moving iron core 23 relatively away from the static iron core 21, the diaphragm assembly 24 moves relatively away from the third valve port 103, the pressure in the channel 151 decreases, the pressure in the back - pressure chamber 31 of the differential - pressure regulating device 30 decreases, the opening degree of the main valve port 32 decreases, and the gas flow rate flowing from the main valve port 32 to the outlet 1b decreases to form a relatively low outlet pressure adjustment. On the basis of realizing the two outlet pressure adjustment modes, the gas proportional valve provided by the present invention further optimizes the structure of the proportional adjustment device to have an adjustment mechanism. Through the cooperation of the first thread part and the second thread part, the body part 41 can move upward or downward relative to the accommodating part 43. The regulating valve stem 22 can abut against the body part, and the body part can drive the regulating valve stem 22 to move upward, which can realize further adjustment of the gas in the high - pressure outlet pressure mode to achieve a higher - pressure or lower - pressure outlet pressure adjustment mode in the high - pressure outlet pressure adjustment mode. Through the cooperation of the third thread part and the fourth thread part, the limit - adjusting rod 42 moves upward or downward relative to the body part 41, so that the limit - adjusting rod 42 abuts against the regulating valve stem 22 and moves downward, or the regulating valve stem 22 always keeps in contact with it as the limit - adjusting rod 42 moves upward, which can realize further adjustment of the gas in the low - pressure outlet pressure mode to achieve a lower - pressure or higher - pressure outlet pressure adjustment mode in the low - pressure outlet pressure adjustment mode. The overall structure of the gas proportional valve provided by the present invention is relatively simple. Compared with the solution of the background technology, the number of parts is relatively reduced. On the basis of realizing the two outlet pressure adjustment modes, it can relatively accurately adjust the gas flow rate to meet various different needs of customers.

[0017] The following is combined with Figures 1-4The structure of the safety driving 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. And 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, ensuring the safe use of the gas proportional valve and preventing gas leakage. Through the optimized design of the safety driving device, a two-stage core component is formed to control the valve port respectively, which can relatively reduce the number of safety valves, and the overall structure of the gas proportional valve is relatively simpler while still ensuring the use safety.

[0018] The following combines Figures 1-2A detailed description of an embodiment provided by the present invention is given. In this embodiment, the safety driving device 10 of the gas proportional valve can be fixedly connected to the body 1 by means of screws or the like. The safety driving device 10 includes a magnetic conductive housing 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 and is fixedly connected to the second static iron core 13b. The second outer sleeve 19b and the second static iron core 13b generally define a receiving cavity A of the safety driving device 10. The second static iron core 13b includes a conical portion 131b. The second outer sleeve 19b is generally a tubular tube with openings at both the upper and lower ends. The upper end portion of the second outer sleeve 19b is fixedly connected to the outer wall of the second static iron core 13b. The coil bobbin 121 is located on the outer peripheral portion of the second static iron core 13b and the second outer sleeve 19b. The coil 12 is wound around the coil bobbin 121, and the housing 11 generally covers the coil 12 as a whole. The safety driving device 10 further 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 that is adapted to the conical portion 131b. 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 fitted with the first sealing portion 143. The first elastic member 16 is sleeved on 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 movement in the receiving cavity A so that the first sealing portion 143 approaches or departs from the first valve port 101. The first moving iron core 141 can perform axial lifting movement along the second outer sleeve wall of the second outer sleeve 19b. The first core assembly 14 includes a first cavity. The first sleeve portion 142 and the first sealing portion 143 generally define the first cavity. 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 located in the first cavity and can perform axial movement 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 portion of the valve stem 152 is fitted 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. 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.

[0019] Specifically, the first valve port 101 and the second valve port 102 are coaxially arranged. To ensure the sealing performance, an O-ring seal can be fixedly connected to the second static iron core 13b, and an O-ring seal can also be fixedly connected to the first moving iron core 141 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 parts formed by processes such as stretching. The first sealing portion 143 and the second sealing portion 153 can be rubber parts that are respectively fitted into the flanging of the first sleeve 142 and the lower end of the valve stem 152. It should be noted that the fitting in the present invention means that the flanging 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 be tightly fitted with it. The first sealing portion 143 includes a cap-shaped metal part 1430 and a rubber part 1431. The cap-shaped metal part 1430 generally covers the rubber part 1431. The first sealing portion 143 also includes a first protrusion 1433 protruding towards 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 housing protrusion of the housing 11. One end of the first elastic member 16 abuts against the first sealing portion 143 and 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 valve closing 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 have an equal-diameter structure with the same diameter up and down. 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 outward from the upper rod portion 1521. The second elastic member 17 is located in the through hole 1511 and is sleeved on the valve stem 152. One end of the second elastic member 17 abuts against the valve stem 152 and the other end abuts against the first moving iron core 141. Specifically, the second elastic member 17 is sleeved on the second protrusion 1521a of the upper rod portion 1521. One end of the second elastic member 17 abuts against the first end face 1410 at the lower end of the first moving iron core 141, and the other end abuts against the flange portion 1522. The second elastic member 17 can be used as a sub-valve spring. When the valve is in the closed state, it exerts a valve closing force on the valve stem 152 to keep it in cooperation with the second valve port 102. And when the coil is energized and the valve starts to switch from the open state to the closed state, through the valve closing force of the sub-valve spring, the second moving iron core 151 and the first moving iron core 141 are smoothly disengaged, and at the same time, a valve closing force is applied to the valve stem 152, so that the valve stem 152 can drive the second moving iron core 151 to move downward smoothly to close the second valve port 102.The second moving iron core 151 further includes a small-diameter portion 1512, a large-diameter portion 1513, and a second end face 1516. A first step 1514 is formed by the transition between the small-diameter portion 1512 and the large-diameter portion 1513. A second step 1515 is further provided inside the second moving iron core 151. The second end face 1516 can abut against the first end face 1410. When in the valve-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. 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.

[0020] The safety driving device 10 further includes a third elastic member 18. The third elastic member 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 peripheral portion of the small-diameter portion 1512, and one end of it 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 return spring. The elastic force of the third elastic member 18 is greater than the gravity of the second moving iron core 151. The third elastic member 18 can overcome the gravity of the second moving iron core 151 so that the second moving iron core 151 can abut against the first moving iron core 141. By providing 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 to the static iron core 13, according to the principle that the closer the distance, the easier it is to be attracted, the first moving iron core 141 can be preferentially attracted to the second moving iron core 151, thereby driving it to move upward and then driving the second sealing portion 153 to lift together to smoothly open the second valve port 101.

[0021] Further, the safety driving device 10 further includes a first magnetic conductor 20a. The first magnetic conductor is generally in the shape of a cylindrical portion with a flanging. The first magnetic conductor 20a is sleeved on the outer peripheral portion of the second outer sleeve 19b. The first magnetic conductor 20a includes a first straight section 21a and a first flanging portion 22a. The lower end face of the first flanging portion 22a abuts against the housing 11 and the upper end face abuts against the coil bobbin 121. The first flanging portion 22a is embedded in the gap formed between the coil bobbin 121 and the housing 11. The outer wall of the first straight section 21a can abut against the coil bobbin 121. 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 housing 11, and another part is transmitted to the first moving iron core 141 and the second moving iron core 151 through the lower part of the housing 11. Due to the setting of the first magnetic conductor 20a, the portion from the housing protrusion 111 of the housing 11 to the first straight section 21a has electromagnetic force, the magnetic conduction area increases, and thus the electromagnetic force increases 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.

[0022] It should be noted that in this embodiment, the third elastic member 18 can also be removed. At this time, since the second moving iron core 151 is not affected by the third elastic member 18 and is affected by gravity, it can abut against the step of the valve stem 152. In order to ensure that when the electromagnetic coil is energized, the first moving iron core 141 can smoothly attract the second moving iron core 151 so that the second moving iron core 151 drives the valve stem 152 to lift upward to 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.

[0023] The driving principle of the safety driving device is briefly introduced below. As shown in the figure, the safety driving device is in the closed valve position state. At this time, the coil 12 is in the power-off state, the first moving iron core 141 is relatively far away from the second static iron core 13b, the first sealing portion 143 closes the first valve port 101, the second sealing portion 153 closes the second valve port 102, and the third elastic member 18 overcomes the gravity of the second moving iron core 151 so that its second end face 1516 abuts against the first end face 1410 of the first moving iron core 141. When the coil 12 starts to switch to the energized state, affected by the electromagnetic force, the first moving iron core 141 is closer to the second moving iron core 151. Therefore, the first moving iron core 141 preferentially attracts the second moving iron core 151, and then the first moving iron core 141 drives the first sleeve portion 142, the first sealing portion 143 and the second moving iron core 151 to lift together in the direction of the second static iron core 13b to overcome the elastic force of the first elastic member 16, that is, 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 lifts 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 abuts against the second step 1515. The second moving iron core 151 drives the valve stem 152 to lift upward together, and the second sealing portion 153 opens the second valve port 102 until it forms Figure 3The first moving iron core 141 is attracted to the second static iron core 13b, and the safety driving device is in the valve-opening position state. It should be noted that a gap L1 is provided between the valve stem 152 and the second moving iron core 151 because there will inevitably be a positional difference during the processing of the product. For example, for the first valve port 101 and the second valve port 102, when there is no gap L1 between them, it is very likely that the second valve port 102 cannot be closed in place, thus posing a safety hazard of gas leakage. The gap L1 is used to eliminate the positional difference between the first valve port 101 and the second valve port 102 to ensure the sealing safety of the two valves. Additionally, if there is no gap left between them, the valve stem 152 is likely to drive the second moving iron core 151 to move downward. 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 enough to follow the movement of the first moving iron core 141, and thus the second valve port 102 cannot be opened smoothly.

[0024] When the safety driving device is in the valve-opening position state, at this time the coil 12 is in the energized state. The first moving iron core 141 abuts against the second static iron core 13b, the flange portion 1522 abuts against the second step 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 de-energized state, the first moving iron core 141 starts to separate from the second static iron core 13b, and the second moving iron core 151 is in an abutting state with the first moving iron core 141. Therefore, the second moving iron core 151 also performs a closing action following the first moving iron core 141. Under the action of the second elastic member 17, that is, the valve-closing elasticity, the second core body assembly 15 should close the port prior to the first core body assembly 14, that is, the second valve port 102 closes first, and then the first valve port 101 closes. Under the action of the second elastic member 17, a certain gap is formed between the second moving iron core 151 and the first moving iron core 141. And under the valve-closing force applied by the second elastic member 17, the valve stem 152 abuts against the second moving iron core 151 and drives the second moving 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 remains stationary under the valve-closing action. The first moving iron core 141 pushes the second moving iron core 151 to continue moving downward to gradually eliminate the gap formed between the second moving iron core 151 and the first moving iron core 141 before, so that a gap L1 is formed between the valve stem 152 and the second moving iron core 151, and finally the first sealing portion 143 closes the first valve port 101.

[0025] It should be noted that other corresponding changes can be made to the part of the safety driving device close to the static iron core. The following is combined with Figure 3Describe the structure of the second safety control device of the gas proportional valve provided by the present invention. The difference from the above safety drive control device lies in the structure near the static iron core. The safety drive device of this gas proportional valve further 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 housing 11 in other ways. The first static iron core 13a includes a recessed portion 131a that is generally U-shaped and a wall portion 132a that extends downward. 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 recessed portion 131a and the closed end 191a forms a clearance fit with the wall portion 132a. The first outer sleeve 19a is formed of a non-magnetic (non-magnetic-conducting) metal material and is generally cylindrical, used for guiding the axial movement of the first core assembly 14 and the airtightness of the valve body. The first moving iron core 141 can drive the first sleeve portion 142 and the first sealing portion 143 to move axially up and down along the wall of the first outer sleeve. The safety drive device includes a receiving cavity A'. The inner cavity of the first outer sleeve 19a forms this receiving cavity A'. The safety drive device 10 is excited by the winding of the coil 12. Through the housing 11, the first magnetic conductor 20a, the first static iron core 13a, and the first moving iron core 141 and the second moving iron core 151, a closed annular magnetic circuit can be formed. When the coil is energized and excited, the magnetic field is conducted through the housing 11 to the first magnetic conductor 20a and the first static iron core 13a. The magnetic poles at the end of the first magnetic conductor 20a are conducted through the gap to the first moving iron core 141 and the second moving iron core 151. 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 mating portion between the two is generally U-shaped, it helps to improve the initial suction force at the moment of energization and plays a role in guiding the magnetic circuit. The first moving iron core 141 can easily and smoothly drive the first sleeve portion 142 and the first sealing portion 143 to be attracted and approach the first static iron core 131a together. The electromagnetic field conducted through the first moving iron core 141 forms a magnetic circuit guide with the wall portion 132a of the first static iron core 131a, and then an electromagnetic circuit that attracts each other is formed through the U-shaped end face and the end face of the first moving iron core 141. In this embodiment, the valve stem 152' 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 and the operating principle in the energized or de-energized state have been described in detail in the first embodiment and will not be elaborated here one by one.

[0026] The following combines Figure 4 to illustrate the structure of the third safety control device of the gas proportional valve provided by the present invention. The difference from the structure of the second safety control device is that in this embodiment, the static iron core component is cancelled, and a magnetic conductor is used to replace the magnetic conduction function of the static iron core. Specifically, the safety driving 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 component 14 and a second core component 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 flanging section 22a. A first gap S1 is formed between the lower end of the coil bobbin 121 and the housing 11. The first flanging section 22a is embedded in the first gap, and the first straight section 21a can abut against the inner wall of the coil bobbin 121. The second magnetic conductor 20b includes a second straight section 21b, a second flanging section 22b and a guiding hole 23b. The first moving iron core includes a tapered portion 24b. A magnetic gap S3 is formed between the tapered portion 24b and the second straight section 21b of the second magnetic conductor 20b. The closed end 191a extends into the guiding hole 23b. A second gap S2 is formed between the upper end of the coil bobbin 121 and the housing 11. The second flanging section 22b is embedded in the second gap S2. The first magnetic conductor 20a and the second magnetic conductor 20b are arranged on the same central axis. In this embodiment, the second magnetic conductor 20b acts as a static iron core. When the coil 12 is energized to generate excitation, a closed annular magnetic circuit is formed through the housing 11, the first magnetic conductor 20a, the second magnetic conductor 20b, the first moving iron core 141 and the second moving iron core 151. The electromagnetic field is transmitted to the first magnetic conductor 20a and the second magnetic conductor 20b through the housing 11. The magnetic pole at the end of the first magnetic conductor 20a is conducted to the second moving iron core 151. Since the second moving iron core 151 abuts against the first moving iron core 141, it is then conducted 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 magnetic conductor 20b. Thus, the electromagnetic force on the second magnetic conductor 20b attracts the first moving iron core 151, and the first moving iron core 151 moves towards the second magnetic conductor 20b to open the valve. It should be noted that the tapered portion 24b is a reduced-diameter portion with a gradually decreasing diameter in the axial direction towards the housing 11. The magnetic gap S3 can enhance the magnetic circuit when the first moving iron core 151 and the second magnetic conductor 20b are attracted. The valve stem structure in this embodiment is the same as that in the second embodiment, and the relevant specific structures of the first core component 14 and the second core component 15 and the operating principles in the energized or de-energized states have been described in detail in the first embodiment, and will not be elaborated here one by one.

[0027] For the gas proportional valve provided by the present invention, when the coil 12 is powered off, if the first moving iron core 141 and the second static iron core 13b cannot be separated and remain attracted or are accidentally stuck, the second moving iron core 151 is separated from the first moving iron core 141 under the valve closing force of the second elastic member 17, and the valve rod 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 first core assembly 14 of the safety driving device fails during the actuation of the gas proportional valve, the second core assembly 15 can still close the valve to cut off the gas flow to ensure the use safety. Similarly, when the second core assembly 15 fails, the first core assembly 14 can still close the valve to cut off the gas flow.

[0028] The following is combined with Figure 5 as well as Figure 6The specific structure of the proportional adjustment device 20 is introduced in detail. The proportional adjustment device 20 includes a receiving cavity B, a stationary iron core 21, a regulating valve rod 22, a moving iron core 23, and a diaphragm assembly 24. The moving iron core 23 is located in the receiving cavity B. The regulating valve rod 22 can be made of a metal material and fixedly connected to the moving iron core or be an integral structure. The proportional adjustment device further includes a sleeve 28, a housing member 29, and a coil component. The coil component is located on the outer peripheral portion of the stationary iron core 21. The housing member 29 has magnetic permeability and generally surrounds the coil component. The sleeve 28 is fixedly connected or limitedly connected to the stationary iron core 21. The sleeve 28 and the stationary iron core 21 generally define the receiving cavity B. The moving iron core 23 can drive the regulating valve rod 22 to perform axial lifting movement along the sleeve wall of the sleeve 28 in the receiving cavity B. The moving iron core 23 is generally in an inverted convex shape and is located above the stationary iron core 21. The stationary iron core 21 is relatively close to the diaphragm assembly 24. When the coil component is energized, under the excitation effect, the moving iron core 23 moves downward as a whole and gradually approaches the stationary iron core 21, and the regulating valve rod 22 moves downward together with the moving iron core 23. When the coil component is de-energized, the excitation effect disappears, the moving iron core 23 moves upward as a whole and gradually moves away from the stationary iron core 21, and the regulating valve rod 22 moves upward together with the moving iron core 23. Specifically, the regulating valve rod 22 includes a body portion 221, an upper end portion 222, and a lower end portion 223. The stationary iron core 21 includes a first recessed portion 211, a first through hole 212, and a second recessed portion 213. The first recessed portion 211 is located at the upper position of the stationary iron core 21. The second recessed portion 213 is located at the lower position of the stationary iron core 21. The first through hole 212 can communicate the first recessed portion 211 and the second recessed portion 213. The moving iron core 23 includes a second through hole 231 and a protruding portion 232. The protruding portion 232 is a small-diameter portion with a diameter smaller than the large-diameter portion 233 of the moving iron core 23. The protruding portion 232 is adapted to the first recessed portion 211. When the coil component is energized and under the excitation effect, the moving iron core 23 and the regulating valve rod 22 move downward together and are attracted to the stationary iron core 21, and the protruding portion 232 can extend into the first recessed portion 211. When the coil component is de-energized and the excitation effect disappears, the moving iron core 23 and the regulating valve rod 22 move upward together and move relatively away from the stationary iron core 21, and the protruding portion 232 moves relatively away from the first recessed portion 211. The outer peripheral wall of the large-diameter portion 233 of the moving iron core 23 can perform axial movement along the sleeve wall in the receiving cavity B. The first through hole 212 and the second through hole 231 are coaxially arranged. The regulating valve rod 22 can sequentially pass through the second through hole 231, the first recessed portion 211, the first through hole 212, and the second recessed portion 213 from top to bottom. At least part of the body portion 221 is located in the first through hole 212 and the second through hole 231, and the lower end portion 223 is located in the second recessed portion 213. The stationary iron core 21 further includes a lower end 214, and the lower end 214 is fixedly connected to the housing member 29. The diaphragm assembly 24 includes a sealing portion 241, a diaphragm 242, a spring seat 243, and a spring 244. The lower end of the regulating valve rod 22 is fixedly connected or limitedly connected to the diaphragm assembly 24.In this embodiment, the two are connected by a limiting method. The lower end portion 223 of the regulating valve rod 22 is embedded in the spring seat 243 and is tightly fitted with it. The spring seat 243 can be made of flexible rubber material, and the flexible deformation is used to tightly connect the lower end portion 223 of the regulating valve rod 22 with the spring seat 243. In addition, the lower end of the regulating valve rod 22 can also be fixedly connected to the diaphragm assembly by interference fit or other methods. The spring 244 is sleeved on the protrusion of the sealing portion 214, with one end abutting against the spring seat 243 and the other end abutting against the sealing portion 214. The spring seat 243 and at least part of the spring 244 are located in the second recess 211. The proportional regulating device 20 further includes a regulating mechanism 40, and the regulating mechanism 40 includes a body portion 41, a limit adjusting rod 42, and a receiving portion 43. In this embodiment, the body portion and the receiving portion of the regulating mechanism are integrally structured with plastic parts, and the limit adjusting rod is made of metal parts. According to actual needs, the body portion or the receiving portion can also be made of metal parts. Here, no specific restrictions are imposed on the materials of the various components of the regulating mechanism. The receiving portion 43 is fixedly connected or limit-connected to the housing member 29. The receiving portion 43 includes an extending portion 431, a flange portion 432, and a receiving hole 433. The upper and lower ends of the receiving portion 43 are both in an open structure. The interior of the receiving portion 43 further includes a receiving hole wall, and a first thread portion 444 that cooperates with the body portion 41 is formed on the receiving hole wall. Specifically, the extending portion 431 can be in interference fit with the sleeve 28, and the flange portion 432 abuts against the outer wall of the housing member 29 so that the entire receiving portion 43 can be fixedly connected or limit-connected to the housing member 29. Or it can also be that the flange portion 432 and the housing member 29 are provided with corresponding screw holes, and the flange portion 432 is fixedly connected to the housing member 29 by tightening the screws. Or it can also be that a protrusion or a recess is provided on the lower bottom surface of the flange portion 432, and a corresponding recess or protrusion is provided on the surface of the housing member 29, and the two are limit-connected by the corresponding cooperation of the recess and the protrusion. It is only necessary to fix the entire receiving portion to the housing member 29. At least part of the body portion 41 is located in the receiving hole 433. If necessary, the upper end of the body portion 41 can also extend outside the receiving hole 433. The body portion 41 can be integrally processed and formed by plastic or metal. The outer wall of the body portion 41 is provided with a second thread portion 4121 that is in threaded cooperation with the first thread portion 444. The body portion 41 is integrally in a cylindrical structure and includes a sleeve body 412, a claw portion 413, a body receiving cavity 414, and a cooperating portion 415. The claw portion 413 extends downward and protrudes from the sleeve body 412. The body receiving cavity 414 includes a notch C. Specifically, a substantially semi-circular notch C is formed between the sleeve body 412 and the claw portion 413. The outer peripheral wall of the cylindrical sleeve body 412 is provided with the second thread portion 4121. The claw portion 413 is integrally in a C-shaped structure with an opening. The claw portion 413 includes an opening 4131, a claw hole 4132, and a claw surface 4133. The upper end portion 222 of the regulating valve rod 22 is placed into the claw hole 4131 through the opening 4131 and is adapted to it, and can extend into the body receiving cavity 414 through the notch C.The jaw surface 4133 can form a limit for the downward movement of the moving iron core 23 through cooperation with the upper flange portion 2221 of the upper end portion 222. A distance L1 is formed between the first recess bottom surface 211a of the static iron core 21 and the bottom surface 232a of the convex portion of the moving iron core 23, and a distance L2 is formed between the jaw surface 4133 and the upper flange portion 2221. And L1 is greater than L2. The regulating valve rod 22 and the opening 4131 can drive the moving iron core 23 to perform axial lifting movement through clearance fit. The mating portion 415 includes a mating hole structure in the shape of an internal hexagon and can be used in cooperation with an external L-shaped internal hexagon wrench tool. The body accommodation cavity 414 communicates with the mating hole. Through the threaded engagement of the first threaded portion 444 and the second threaded portion 4121, the body portion 41 moves upward or downward relative to the accommodation portion 43. It should be noted that the mating hole structure of the mating portion can also be other polygonal or irregular-shaped structures as long as it can be used in cooperation with an external wrench to enable the body portion to move upward or downward relative to the accommodation portion.,

[0029] When assembling each component of the proportional adjustment device 20, the body portion 41 of the adjustment mechanism 40 and the limit adjustment rod 42 can be installed. Or first fixedly connect the moving iron core 23 and the regulating valve rod 22 or install them as an integral structure to form a moving iron core valve rod assembly. Then, the upper end portion of the regulating valve rod 22 is placed into the opening 4131 on the side of the jaw portion 413, and then the whole is placed into the accommodation cavity B together, so that the regulating valve rod 22 is aligned with the first through hole 212. Then, each component of the installation diaphragm assembly 24 is loaded in sequence. The upper flange portion 2221 of the regulating valve rod 22 can abut against the limit regulating valve rod 42 under the reset action of the spring 244. The inner peripheral wall of the sleeve body 412 is also provided with a third threaded portion 4122 that cooperates with the limit regulating valve rod 42. At least the limit regulating valve rod 42 is located in the body accommodation cavity 414, and the lower end of the limit regulating valve rod 42 can also extend into the notch C cavity as long as it can abut against the regulating valve rod 22 when in the energized state. The outer peripheral wall of the limit regulating valve rod 42 is provided with a fourth threaded portion 421, and the upper end portion of the limit regulating valve rod 42 is provided with a groove portion in the shape of a substantially straight depression. Through the threaded engagement of the third threaded portion 4122 and the fourth threaded portion 421, the groove portion cooperates with an external flat-blade screwdriver tool to make the limit regulating valve rod 42 move upward or downward relative to the sleeve body 412. It should be noted that the upper end portion of the limit regulating valve rod can also be provided with other shaped groove portions for use in cooperation with external tools as long as it is ensured that the limit regulating valve rod can move upward or downward relative to the sleeve body.,

[0030] The proportional adjustment device 20 also includes a magnetic conductive part assembly 50, which includes a first magnetic conductive part 51 and a second magnetic conductive part 52. The first magnetic conductive part 51 is sleeved on the outer periphery of the static iron core 21 and abuts against it, and the second magnetic conductive part 52 is sleeved on the outer periphery of the sleeve 28 and abuts against it. The first magnetic conductive part 51 includes a first straight section and a first flange section, and the second magnetic conductive part 52 includes a second straight section and a second flange section. The first straight section abuts against the outer periphery of the static iron core 21, the first flange section abuts against the skeleton of the coil component and the lower part of the outer shell 29 respectively, and the second straight section abuts against the outer periphery of the sleeve 28. The moving iron core 23 abuts against at least part of the second straight section through the sleeve 28, and the second flange section abuts against the skeleton of the coil component and the upper part of the outer shell 29 respectively. By energizing the proportional adjustment device, under the action of excitation, the magnetic force generated by the coil component is transmitted to the entire outer shell 29, and the lower end 214 of the static iron core 21 abuts against the outer shell 29 is fixedly connected, that is, the static iron core and the shell member have a certain magnetic conductive area, and the magnetic force can be transmitted to the static iron core. By setting the first magnetic conductive part 51, the matching area with the static iron core 21 can be increased to further enhance the magnetic force. Another part of the magnetic force is transmitted to the second magnetic conductive part 52 through the upper shell of the shell member 29. At least part of the second straight section has an indirect offset area with the moving iron core 23. The magnetic force can be transmitted to the moving iron core 23 through the contact area between the second straight section and the moving iron core 23, so that the moving iron core and the static iron core are attracted to each other to actuate the product. The magnetic conductivity of the proportional adjustment device when it is actuated as a whole is enhanced by setting the magnetic conductive part assembly. In addition, in order to enhance the magnetic conductivity of the proportional adjustment device, the adjustment mechanism 40 can also be moved upward to the outside of the shell member 29 as a whole. It is only necessary to ensure that it does not separate from the product as a whole. When the moving iron core 23 and the regulating valve stem 22 move axially upward, they can contact with the upper opening of the shell member 29 to form magnetic conduction.

[0031] The following is a detailed description of the operating principle of the proportional adjustment device 20 and the pressure difference adjustment device 30 to achieve the high-pressure and low-pressure outlet pressure adjustment mode of the gas proportional valve. The gas enters from the inlet 1a of the gas proportional valve, and the safety control device 10 controls the gas safety switch function of the gas proportional valve. The first core component 14 of the safety control device 10 opens the first valve port 101, and the second core component 15 opens the second valve port 102. The gas enters the main flow channel 1c from the first valve port 101 and the second valve port 102. When it is necessary to achieve the high-pressure outlet pressure adjustment mode of the gas proportional valve, the proportional adjustment device can be The coil component is energized and, under the action of excitation, the regulating valve stem 22 moves downward with the moving iron core 23 close to the static iron core 21, the regulating valve stem 22 gradually moves away from the limit regulating rod 42, the protrusion 232 gradually extends into the first recessed portion 211, the regulating valve stem 22 applies a force to the spring 244 through the spring seat 243, the spring 244 is pressed and brings the sealing portion 241 relatively close to the third valve port 103, the opening of the third valve port 103 decreases accordingly, the pressure in the flow channel 151 gradually increases, the pressure in the back pressure chamber 31 of the pressure differential regulating device 30 also increases accordingly, the pressure differential diaphragm 33 overcomes the main valve spring The spring force of the spring 34 pushes the pressure difference valve stem to make the main valve sealing part 35 push open the main valve port 32, and the opening of the main valve port 32 gradually increases, and the gas flow from the main valve port 32 to the outlet 1b increases, and finally the gas flow to the external combustion chamber increases, realizing a higher outlet pressure regulation mode of the gas proportional valve. The pressure set in the high-pressure outlet pressure mode used by the customer is generally 900pa. When the customer needs to be higher or lower than this pressure value to further adjust the gas flow, it can be achieved by adjusting the cooperation between the valve stem 42 and the main body 41, specifically, by the claw surface 41 33 is achieved by the cooperation with the upper flange 2221 of the upper end 222. For example, the stroke of L1 is set to 1, the stroke of L2 is set to 0.8, the coil component is energized and under the action of excitation, the regulating valve stem 22 moves downward with the moving iron core 23 close to the static iron core 21, the upper flange 2221 of the regulating valve stem 22 and the limit regulating rod 42 begin to separate from the abutting state, and the protrusion 232 gradually extends into the first recessed portion 211. Due to the existence of the stroke difference, the protrusion 232 does not completely abut against the first recessed portion 211. At this time, the upper flange 2221 can abut against the claw surface 4133.To prevent the further downward movement of the moving iron core 23, when the customer, according to the actual needs of the system or other scenarios, realizes the further adjustment of the gas to increase the gas flow rate and achieve a higher pressure adjustment mode in the high-pressure outlet pressure mode, an Allen wrench tool can be used to operate through the opening at the upper end of the accommodating portion 43 and align with the mating hole. Through the threaded engagement of the first threaded portion 444 and the second threaded portion 4121, the entire body portion 41 moves downward relative to the accommodating portion 43. The claw portion 413 extends out of the accommodating hole 433. Under the action of the energizing electromagnetic force, the regulating valve stem 22 drives the moving iron core 23 to move further downward, and the convex portion 232 further extends into the first recessed portion 211. The regulating valve stem 22 further applies a force to the spring 244 through the spring seat 243. The compressed spring 244 drives the sealing portion 241 to move closer to the third valve port 103. The opening degree of the third valve port 103 decreases accordingly, and the pressure in the flow channel 151 gradually increases. The pressure in the back pressure chamber 31 of the differential pressure regulating device 30 also increases accordingly. The differential pressure diaphragm 33 overcomes the spring force of the main valve spring 34 and pushes the differential pressure valve stem to push the main valve sealing portion 35 to open the main valve port 32. The opening degree of the main valve port 32 gradually increases, and the gas flow rate flowing from the main valve port 32 to the outlet 1b increases. Eventually, the gas flow rate flowing to the external combustion chamber also further increases, realizing the further adjustment of the gas flow rate by the gas proportional valve in the high-pressure outlet pressure adjustment mode to achieve a higher pressure adjustment mode; conversely, when the customer, according to the actual needs of the system or other scenarios, realizes the further adjustment of the gas to reduce the gas flow rate in the high-pressure outlet pressure mode to achieve a lower pressure adjustment mode in the high-pressure outlet pressure adjustment mode, an Allen wrench tool can be used to operate through the opening at the upper end of the accommodating portion 43 and align with the mating hole. Through the threaded engagement of the first threaded portion 444 and the second threaded portion 4121, the entire body portion 41 moves upward relative to the accommodating portion 43. The claw surface 4133 of the claw portion 413 abuts against the upper flange portion. The body portion 41 drives the regulating valve stem 22 to move upward as a whole. The acting force on the spring seat 243 and the spring 244 weakens. Under the pressure action, the sealing portion 241 moves relatively away from the third valve port 103. The opening degree of the third valve port 103 increases accordingly. Part of the gas flows from the pressure relief channel 17 to the outlet 1b. The pressure in the flow channel 151 gradually decreases. The pressure in the back pressure chamber 31 of the differential pressure regulating device 30 also decreases accordingly. The main valve sealing portion 35 approaches the main valve port 32. The opening degree of the main valve port 32 gradually decreases. The gas flow rate flowing from the main valve port 32 to the outlet 1b decreases. Eventually, the gas flow rate flowing to the external combustion chamber decreases, realizing the further adjustment of the gas flow rate by the gas proportional valve in the high-pressure outlet pressure adjustment mode to achieve a lower pressure outlet pressure adjustment mode.,

[0032] When it is necessary to implement the low-pressure outlet pressure regulation mode of the gas proportional valve, the proportional regulation device is powered off, the electromagnetic force disappears, the regulating valve stem 22 drives the moving iron core 23 to move relatively away from the static iron core 21, the convex part 232 gradually moves away from the first concave part 211, and the upper flange part 2221 of the regulating valve stem 22 remains in contact with the limit regulating valve stem 42 under the action of the spring 244. The acting force on the spring seat 243 and the spring 244 weakens, the sealing part 241 moves relatively away from the third valve port 103, the opening degree of the third valve port 103 increases accordingly, part of the gas flows from the pressure relief channel 17 to the outlet 1b, the pressure in the flow channel 151 gradually decreases, and the pressure in the back pressure chamber 31 of the differential pressure regulating device 30 also decreases accordingly. The opening degree of the main valve port 32 decreases, the gas flow rate flowing from the main valve port 32 to the outlet 1b decreases, and finally the gas flow rate flowing to the external combustion chamber decreases, realizing the low-pressure outlet pressure regulation mode of the gas proportional valve. Generally, the pressure set in the low-pressure outlet pressure mode used by customers during use is 450 Pa. When the customer needs to be higher or lower than this pressure value according to actual needs to further adjust the gas flow rate, a flat-blade screwdriver can be used to cooperate with the groove part of the limit adjusting rod 42 through the upper opening of the accommodating part and the cooperation hole of the cooperating part to make the limit adjusting rod 42 move upward or downward relative to the sleeve body 412. When it is necessary to increase the gas flow rate regulation under the low-pressure outlet pressure regulation mode according to the system needs to achieve a higher-pressure regulation mode under the low-pressure outlet pressure regulation mode, the groove part can be cooperated with an external flat-blade screwdriver tool, and through the thread cooperation of the third thread part 4122 and the fourth thread part 421, the limit adjusting rod 42 moves downward relative to the sleeve body 412. The limit adjusting rod 42 presses the regulating valve stem 22 to move downward, and the regulating valve stem 22 drives the moving iron core 23 to move downward together to further approach the static iron core 21. The gas flow rate increases to achieve the higher-pressure outlet pressure regulation mode, which has been described before and will not be elaborated here one by one. As a result, the gas flow rate finally flowing to the external combustion chamber also increases further, realizing the increase regulation of the gas flow rate of the gas proportional valve under the low-pressure outlet pressure regulation mode to achieve a higher pressure regulation mode.Conversely, when it is necessary to implement the reduced flow regulation of the gas under the low-pressure outlet pressure regulation mode according to the system requirements to achieve a lower outlet pressure regulation mode under the low-pressure outlet pressure regulation mode, the groove part can be cooperated with an external flat screwdriver tool. Through the thread cooperation between the third thread part 4122 and the fourth thread part 421, the limit adjustment rod 42 moves upward relative to the sleeve body 412. Under the action of the spring 244, the regulating valve rod 22 drives the moving iron core 23 upward to continue to keep in contact with the limit adjustment rod 42. The acting forces on the spring seat 243 and the spring 244 are weakened, and the diaphragm assembly 24 moves relatively away from the third valve port 103. The gas flow rate decreases to achieve the lower-pressure outlet pressure regulation mode, which has been described before and will not be elaborated here. As a result, the gas flow rate finally flowing to the external combustion chamber further decreases, realizing the reduced regulation of the gas flow rate by the gas proportional valve under the low-pressure outlet pressure regulation mode to achieve a lower-pressure outlet pressure regulation mode.

[0033] It should be noted that the flow channel 151 described in the present invention includes a first flow channel 151a, a second flow channel 151b, and a third flow channel 151c. The first flow channel 151a, the second flow channel 151b, and the third flow channel 151c are interconnected. The gas enters the flow channel 151 through the first valve port 101 and the second valve port 102. The increase or decrease of the opening degree of the third valve port 103 can directly affect the change of the pressure in the flow channel 151. The first flow channel 151a is relatively close to the safety control device 10 and one end is connected to the second valve port 102. One end of the second flow channel 151b is connected to the third valve port. The third flow channel 151c is relatively close to the differential pressure regulating device 30 and one end is connected to the back pressure chamber 31. Through the flow channel 151, the safety control device 10, the proportional regulating device 20, and the differential pressure regulating device 30 can be respectively connected. The gas proportional valve provided by the present invention can achieve the high-pressure or low-pressure outlet pressure regulation mode of the gas proportional valve through the setting of the safety control device 10, the proportional regulating device 20, and the differential pressure regulating device 30 and through their mutual cooperation.

[0034] The gas proportional valve provided by the present invention realizes two outlet pressure adjustment modes through the cooperation of a proportional adjustment device and a differential pressure adjustment device. The two-stage independent proportional adjustment device in the background art is integrated into one body. The gas flow is adjusted by the energized or de-energized state of the proportional adjustment device. The functions of the two-stage independent proportional adjustment device in the background art can be integrated into one proportional adjustment device. Through the cooperation with the differential pressure adjustment device, an independent adjustment mechanism for high or low outlet pressure is realized, relatively reducing the number of parts and optimizing the overall structure of the gas proportional valve. At the same time, through the adjustment mechanism added to the proportional adjustment device, on the basis of realizing the high or low outlet pressure adjustment mode, further adjustment of higher or lower outlet pressure is realized to further adjust the gas flow, which is beneficial for customers to relatively accurately adjust the gas under the two outlet pressure adjustment modes according to system or actual needs to meet different customer requirements.

[0035] In addition, when a DC constant current power supply is connected to the proportional adjustment device of the gas proportional valve, the outlet pressure of the valve body can be adjusted proportionally linearly. The primary pressure input at the gas inlet, that is, the gas inlet pressure, can also be represented by P1, I represents the current, and P2 represents the secondary pressure, that is, the outlet pressure. The input power supply of the proportional adjustment device is directly proportional to the outlet pressure of the valve body. That is, the smaller the current, the smaller the compression force of the moving iron core 23 on the diaphragm assembly through the spring, that is, the smaller the opening of the main valve port 32, and the larger the current, the larger the opening of the main valve port 32. By controlling the linearity of the input current of the proportional adjustment device, the proportional linear adjustment of the outlet pressure of the gas proportional valve can be realized.

[0036] The present invention mainly focuses on protecting the structure of the proportional adjustment device, and the proportional adjustment device realizes a two-stage, i.e., high and low pressure outlet pressure adjustment mode through cooperation with the safety control device and the differential pressure adjustment device. The three structures of the safety control device described in the specification can be flexibly replaced and applied to the gas proportional valve structure. For other safety control devices and pressure adjustment device structures, further structural improvements can be made according to the system or actual needs. The gas proportional valve provided by the present invention further optimizes the structure of the proportional adjustment device, integrates the two-stage independent proportional adjustment devices in the background technology into one, and realizes the direct adjustment of the gas flow rate through the energized or de-energized state of the proportional adjustment device. It can integrate the functions of the two-stage independent proportional adjustment devices in the background technology into one proportional adjustment device, and realizes an independent adjustment mechanism for two outlet pressures, high pressure or low pressure, through cooperation with the differential pressure adjustment device. The number of components is relatively reduced and there is no need to additionally set up an electromagnetic drive device mechanism, optimizing the overall structure of the gas proportional valve. At the same time, by adding an adjustment mechanism to the proportional adjustment device, on the basis of realizing the high or low pressure outlet pressure adjustment mode, a higher or lower outlet pressure adjustment mode is further realized to further adjust the gas flow rate, which is beneficial for customers to relatively accurately adjust the gas under the two outlet pressure adjustment modes according to the system or actual needs to meet different customer requirements.

[0037] 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 described based on the drawings in the specification, and are only naming methods for distinguishing different components and should not be considered as having relevant order limitations on each component. The above is only the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A gas proportional valve, characterized in that, It includes a proportional adjustment device, and the proportional adjustment device includes a housing member, a stationary iron core, a movable iron core, a regulating valve rod, and a diaphragm assembly. The movable iron core is located above the stationary iron core. The lower end of the regulating valve rod is fixedly connected or limitedly connected to the diaphragm assembly. The regulating valve rod is fixedly connected or integrally structured with the movable iron core. The movable iron core can bring the regulating valve rod closer to or farther away from the stationary iron core. The proportional adjustment device further includes an adjustment mechanism, and the adjustment mechanism includes a body part, a limit adjustment rod, and a receiving part. The regulating valve rod can abut against the body part, and the body part can drive the regulating valve rod to move upward. The receiving part is fixedly connected or limitedly connected to the housing member. The receiving part includes a first threaded part, and the outer wall of the body part is provided with a second threaded part. The first threaded part is in threaded cooperation with the second threaded part. The body part includes a body receiving cavity. At least part of the limit adjustment rod is located in the body receiving cavity. At least part of the regulating valve rod extends into the body receiving cavity and can abut against the limit adjustment rod. The inner wall of the body part is provided with a third threaded part, and the outer peripheral wall of the limit adjustment rod is provided with a fourth threaded part. The third threaded part is in threaded cooperation with the fourth threaded part.

2. The gas proportional valve according to claim 1, characterized in that, The body part includes a sleeve body and a claw part. The regulating valve rod includes an upper end part. The upper end part can abut against the limit adjustment rod through a claw hole of the claw part. The claw part can abut against the upper end part and the claw part can drive the regulating valve rod to move upward. The claw part cooperates with the regulating valve rod to limit the downward actuation of the movable iron core.

3. The gas ratio valve according to claim 2, characterized in that, The claw part is integrally in a C-shaped structure with an opening. A substantially semi-circular notch is formed between the sleeve body and the claw part. The claw part includes an opening, a claw hole, and a claw surface. The regulating valve rod is inserted into the claw hole from the opening and is adapted to the claw hole. The upper end part extends into the notch through the claw hole. The claw surface can abut against the upper flange part of the upper end part.

4. The gas proportional valve according to any one of claims 1-3, characterized in that, The body part further includes a fitting part. The fitting part includes a fitting hole in the shape of an internal hexagon. The fitting part can be used in cooperation with an external internal hexagon wrench. Through the threaded cooperation of the first threaded part and the second threaded part, the body part can move upward or downward relative to the receiving part.

5. The gas proportional valve according to any one of claims 2-3, characterized in that, The upper end part of the limit adjustment rod is provided with a groove part substantially in the shape of a linear depression. The groove part is used in cooperation with an external screwdriver tool. Through the threaded cooperation of the third threaded part and the fourth threaded part, the limit adjustment rod can move upward or downward relative to the sleeve body of the body part. When the limit adjustment rod moves downward relative to the sleeve body, the limit adjustment rod can abut against the regulating valve rod and drive it to move downward. When the limit adjustment rod moves upward relative to the sleeve body, the regulating valve rod continues to abut against the limit adjustment rod under the action of the spring of the diaphragm assembly.

6. The gas proportional valve according to any one of claims 1-3, characterized in that The accommodating part includes an extension part, a flange part, and an accommodating hole. The upper and lower ends of the accommodating part are both open structures. The interior of the accommodating part includes an accommodating hole wall, and the accommodating hole wall is provided with the first thread part that cooperates with the body part. The proportional adjustment device further includes a sleeve. The whole accommodating part is fixed to the housing part by the interference fit between the extension part and the sleeve or the screw fit between the flange part and the housing part.

7. The gas proportional valve according to claim 1, wherein the moving iron core is integrally in an inverted convex shape and is located above the static iron core. The static iron core is relatively close to the diaphragm assembly. The proportional adjustment device further includes a sleeve and an accommodating cavity. The sleeve is fixedly connected to the static iron core and the sleeve and the static iron core generally define the accommodating cavity. The regulating valve rod can drive the whole moving iron core to move downward close to the static iron core or the regulating valve rod can drive the whole moving iron core to move upward away from the static iron core.

8. The gas proportional valve according to claim 7, wherein The static iron core includes a first recessed part, a first through hole, and a second recessed part. The first through hole can communicate the first recessed part and the second recessed part. At least part of the diaphragm assembly is located in the second recessed part. The moving iron core includes a second through hole and a protruding part. The first through hole and the second through hole are coaxially arranged. The protruding part can extend into or away from the first recessed part. The regulating valve rod can sequentially pass through the second through hole, the first recessed part, the first through hole, and the second recessed part from top to bottom.

9. The gas proportional valve according to claim 1, characterized in that, The proportional adjustment device further includes a magnetic conduction part assembly and a coil component. The magnetic conduction part assembly includes a first magnetic conduction part and a second magnetic conduction part. The first magnetic conduction part is sleeved on the outer peripheral part of the static iron core. The second magnetic conduction part is sleeved on the outer peripheral part of the sleeve of the proportional adjustment device. The first magnetic conduction part includes a first straight section and a first flanging section. The second magnetic conduction part includes a second straight section and a second flanging section. The first flanging section abuts against the skeleton of the coil component and the lower part of the housing part respectively. The second flanging section abuts against the skeleton and the upper part of the housing part respectively. The moving iron core abuts against at least part of the second straight section through the sleeve.

10. The gas proportional valve according to claim 1, wherein, The gas proportional valve includes a safety control device and a differential pressure adjustment device. The gas proportional valve includes a body. The body is provided with a first valve port, a second valve port, and a third valve port. The body is provided with a flow channel. The flow channel includes a first flow channel, a second flow channel, and a third flow channel. The first flow channel is close to the safety control device and one end thereof communicates with the second valve port. One end of the second flow channel communicates with the third valve port. The third flow channel is close to the differential pressure adjustment device and one end of the third flow channel communicates with the back pressure chamber of the differential pressure adjustment device. The first flow channel, the second flow channel, and the third flow channel communicate with each other.

11. The gas proportional valve according to claim 10, characterized in that, The safety control device includes a first magnetic conductor, a second magnetic conductor, a first outer sleeve, a first core assembly, and a second core assembly. The first magnetic conductor and the second magnetic conductor are sleeved on the outer periphery of the first outer sleeve. 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 fitted with the first sealing portion. The first moving iron core can drive the first sleeve and the first sealing portion to axially move within the first outer sleeve, so that the first sealing portion approaches or moves away from the first valve port. The first core assembly includes a first cavity. The second core assembly includes a second moving iron core, a valve rod, and a second sealing portion. The second moving iron core includes a through hole. The second moving iron core is located in the first cavity and can axially move along the sleeve wall of the first sleeve portion. The second moving iron core can abut against the first moving iron core. The lower end of the valve rod is fitted with the second sealing portion. At least part of the valve rod extends into the through hole. The valve rod can drive the second moving iron core to move downward so that the second sealing portion closes the second valve port.

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