Gas proportional valve

Abstract

The application provides a gas proportional valve, which is capable of realizing high-pressure or low-pressure outlet pressure regulation mode by optimizing the structure of a proportional adjusting device, making a diaphragm assembly approach or move away from a valve port and form a distance with the valve port, thereby affecting the opening size of the valve port, and optimizing the overall structure of the gas proportional valve, and the overall structure is simpler and the two outlet pressure regulation modes can be realized.

Description

Technical Field

[0001] This invention relates to the field of gas control technology, and in particular to a gas proportional valve. Background Technology

[0002] Currently, 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. The safety control device is used to control the opening and safe closing of the gas flow channel. It is usually composed of two independent electromagnetic valves that open or close two valve ports. The electromagnetic drive device, in conjunction with two independently set proportional adjustment devices, adjusts the opening of the main valve port of the differential pressure 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 objective of this invention is to provide a new type of gas proportional valve that can also achieve high-pressure or low-pressure outlet pressure regulation modes.

[0004] This invention provides a gas proportional valve, including a valve port and a proportional adjustment device. The proportional adjustment device includes a stationary iron core, a moving iron core, an adjusting valve stem, an elastic element, and a diaphragm assembly. The adjusting valve stem is fixedly connected to the moving iron core or is an integral structure. The moving iron core is located below the stationary iron core and can move the adjusting valve stem closer to or away from the stationary iron core. The lower end of the adjusting valve stem is fixedly connected to or limited by the diaphragm assembly. One end of the elastic element abuts against the stationary iron core, and the other end abuts against the adjusting valve stem or the moving iron core. The proportional adjustment device also includes a housing and a coil component. When the coil component is energized, the moving iron core moves upward with the adjusting valve stem to approach the stationary iron core, and the diaphragm assembly moves away from the valve port and forms a first distance from the valve port. When the coil component is de-energized, the moving iron core moves downward with the adjusting valve stem to move away from the stationary iron core, and the diaphragm assembly moves closer to the valve port and forms a second distance from the valve port. The first distance is greater than the second distance.

[0005] The present invention also provides another gas proportional valve, including a valve port and a proportional adjustment device. The proportional adjustment device includes a stationary iron core, a moving iron core, an elastic element, and a diaphragm assembly. The moving iron core is located below the stationary iron core and can approach or move away from the stationary iron core. The lower end of the moving iron core includes a second protrusion, which is fixedly connected or limitedly connected to the diaphragm assembly. One end of the elastic element abuts against the stationary iron core and the other end abuts against the moving iron core. The proportional adjustment device also includes a housing and a coil component. When the coil component is energized, the moving iron core moves upward to approach the stationary iron core, and the diaphragm assembly moves away from the valve port and forms a first distance from the valve port. When the coil component is de-energized, the moving iron core moves downward to move away from the stationary iron core, and the diaphragm assembly moves closer to the valve port and forms a second distance from the valve port. The first distance is greater than the second distance.

[0006] The gas proportional valve provided by the present invention optimizes the structure of the proportional adjustment device. When the coil component is energized, the diaphragm assembly is relatively far away from the valve port and forms a first distance with the valve port. When the coil component is de-energized, the diaphragm assembly is relatively close to the valve port and forms a second distance with the valve port. The first distance is greater than the second distance, thereby enabling the gas proportional valve to achieve high-pressure or low-pressure outlet pressure adjustment mode. Attached Figure Description

[0007] Figure 1 A cross-sectional structural schematic 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.

[0008] Figure 2 A cross-sectional structural schematic diagram of the safety control device of the first structure of the gas proportional valve provided by the present invention in the valve open state.

[0009] Figure 3 A cross-sectional structural schematic diagram of a safety control device for a second structure of a gas proportional valve provided by the present invention.

[0010] Figure 4 A cross-sectional structural schematic diagram of a safety control device for a third structure of a gas proportional valve provided by the present invention.

[0011] Figure 5 A schematic diagram of the overall structure of the gas proportional valve and the proportional adjustment device of the gas proportional valve in the energized state provided by the present invention.

[0012] Figure 6 A schematic diagram of the overall structure of the gas proportional valve provided by the present invention and the structure of the proportional adjustment device of the gas proportional valve in the power-off state.

[0013] Figure 7 A second embodiment of the proportional regulating device for the gas proportional valve provided by the present invention;

[0014] Figure 8 A third embodiment of the proportional adjustment device for the gas proportional valve provided by the present invention;

[0015] Figure 9 This invention provides a fourth embodiment of the proportional adjustment device for a gas proportional valve.

[0016] Figure 10 The fifth embodiment of the proportional regulating device for the gas proportional valve provided by the present invention;

[0017] Figure 11 The sixth embodiment of the proportional adjustment device for the gas proportional valve provided by the present invention;

[0018] Figure 12The seventh embodiment of the proportional regulating device for the gas proportional valve provided by the present invention; Detailed Implementation

[0019] like Figure 1 The gas proportional valve shown includes a body 1, an inlet 1a, and an outlet 1b. A gas main flow channel 1c is formed inside the body 1, through which gas flows in from the inlet 1a and out from the outlet 1b. The body 1 can be die-cast from aluminum alloy. The body 1 is provided with a first valve port 101, a second valve port 102, and a valve port 103. The gas proportional valve also includes a safety drive device 10, a proportional adjustment device 20, and a differential pressure adjustment device 30. The safety drive device 10, the proportional adjustment device 20, and the differential pressure adjustment device 30 can be fixedly connected to the body 1.

[0020] 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. Safety drive device 10, together with the first valve port 101 and the second valve port 102, forms a dual-valve electromagnetic control mechanism. As an important control component of the gas proportional valve's gas flow channel, it is used to control the opening and safe closing of the gas flow channel, effectively preventing gas leakage. Proportional adjustment device 20 includes a stationary iron core 21, an adjusting valve stem 22, a moving iron core 23, an elastic element 25, and a diaphragm assembly 24. The adjusting valve stem 22 and the moving iron core 23 are fixedly connected. The structure may be integrated. When the outlet pressure of the gas proportional valve needs to be adjusted, the gas enters through 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 main gas channel 1c through the first valve port 101 and the second valve port 102. Under the energized state, under the excitation of the electromagnetic coil, the moving iron core 23 can move upward with the regulating valve rod 22 to approach the stationary iron core 21. The diaphragm assembly 24 is relatively far away from the valve port 103 and forms a first distance L1 with the valve port 103. The opening of the valve port 103 increases relatively, and part of the pressure accumulated in the flow channel 151 is released through the valve port 103. As the pressure in the flow channel 151 decreases, the pressure in the back pressure chamber 31 of the differential pressure regulating device 30 decreases, and the opening of the main valve port 32 also decreases. The flow rate of the gas from the main valve port 32 to the outlet 1b decreases, thus forming a relatively low outlet pressure regulating mode. Conversely, the coil component of the proportional regulating device 20 is de-energized, the electromagnetic force disappears, and under the valve sealing force of the elastic element 25, the moving iron core 23, along with the regulating valve rod 22, gradually moves away from the stationary iron core 21 and downwards. The diaphragm assembly 24 moves relatively closer to the valve port 103 and forms a second distance L2 with the valve port 103. The opening of the valve port 103 decreases relatively, and the first distance L1 is greater than the second distance L2. The pressure accumulated in the flow channel 151 increases, the pressure in the back pressure chamber 31 increases, and the differential pressure diaphragm 33 overcomes the force of the main valve spring 34, causing the main valve sealing part 35 to gradually open the main valve port 32. The opening degree of the main valve port 32 increases, and the gas flow from the main valve port 32 to the outlet 1b decreases to form a relatively high outlet pressure regulation mode. The gas proportional valve provided by the present invention allows the gas flow to be directly proportionally regulated and controlled by the proportional regulation device after the gas enters through the first valve port 101 and the second valve port 102. This reduces the number of parts and can still achieve high pressure or low pressure outlet pressure regulation mode on the basis of a relatively simple overall structure of the gas proportional valve.

[0021] The following is combined with Figure 1-3The structure of the safety drive device 10 is described in detail, including an outer tube, a coil 12, a first core assembly 14, and a second core assembly 15. At least part of the outer tube is located inside the coil 12. The first core assembly 14 can approach or move away from the first valve port 101 to open or close it. The second core assembly 15 can approach or move away from the second valve port 102 to open or close it. Even if the first core assembly 14 fails to close the first valve port 101, the second core assembly 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 drive device, it forms a two-stage core assembly that controls the valve port separately, making the overall structure of the gas proportional valve relatively simple while still ensuring safe use.

[0022] The following is combined with Figure 1This invention provides a first structure of a safety control device for a gas proportional valve. In this embodiment, the safety drive device 10 of the gas proportional valve can be fixedly connected to the body 1 by screws or other means. The safety drive device 10 includes a magnetically conductive outer shell 11, a coil 12, a second stationary iron core 13b, and a second outer sleeve 19b. At least a portion of the second outer sleeve 19b is located in the inner hole of the coil 12. The second outer sleeve 19b is fixedly connected or limited to the second stationary iron core 13b. The second outer sleeve 19b and the second stationary iron core 13b generally define a receiving cavity A for the safety drive device 10. The second stationary iron core 13b includes a conical portion 131b. The second outer sleeve 19b is generally a cylindrical tube with openings at both the top and bottom. The upper end of the second outer sleeve 19b is fixedly connected or limited to the outer wall of the second stationary iron core 13b. The coil frame 121 is located on the outer periphery of the second stationary iron core 13b and the second outer sleeve 19b. The coil 12 is wound on the coil frame 121. The outer shell 11 generally covers the coil 12. The safety drive device 10 also includes a first core assembly 14, a second core assembly 15, a first elastic element 16, and a second elastic element 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, and the lower end of the first sleeve portion 142 is fixedly connected or limitedly connected to the first sealing portion 143. The elastic element 16 is sleeved on the first sealing part 143. 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 movements so that the first sealing part 143 approaches or moves away from the first valve port 101. The first moving iron core 141 can perform axial lifting and lowering movements along the second outer sleeve wall of the second outer sleeve 19b. The safety control device includes a first cavity, which is substantially defined by the first sleeve part 142 and the first sealing part 143. 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 part 153. The second moving iron core 151 includes a through hole 1511. The second moving iron core 151 is at least partially located in the first cavity and can move axially along the sleeve wall of the first sleeve part 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 fixedly connected or limited to the second sealing part 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 part 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.

[0023] Specifically, the first valve port 101 and the second valve port 102 are coaxially arranged. To ensure sealing, the second stationary iron core 13b can be fixedly connected with an O-ring seal, and the first moving iron core 141 can also be fixedly connected with an O-ring seal for airtight connection. The second outer sleeve 19b and the first sleeve 142 can be made of non-magnetic materials such as stainless steel or copper formed by stretching or other processes. In this embodiment, the first sealing part 143 and the second sealing part 153 can be rubber parts that are embedded and fitted with the flange of the first sleeve 142 and the lower end of the valve stem 152, respectively. The flange of the first sleeve 142 or the lower end of the valve stem 152 is squeezed into the rubber part and tightly fitted with it through the flexible deformation of the rubber part. It should be noted that the first sleeve part 142 The valve stem 152 can also be fixedly connected to the first sealing part by means of interference fit or other methods. The lower end of the valve stem 152 can also be fixedly connected to the second sealing part by means of interference fit or other methods. The first sealing part 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 part 143 also includes a first protrusion 1433 protruding towards the stationary 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. One end of the first elastic member 16 abuts against the first sealing part 143 and the other end abuts against the outer shell 11. The first elastic member 16 is the main valve spring. When the valve is closed, it acts as a spring for the first sealing part 143. The sealing force keeps it in contact with the first valve port 101. The valve stem 152 includes an upper stem 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 stem portion 1521. Of course, the valve stem can also be set to have the same diameter at the top and bottom. The upper stem 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 stem 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 1432. Specifically, the second elastic element 17 is sleeved on the second protrusion 1521a of the upper rod portion 1521. One end of the second elastic element 17 abuts against the first end face 1410 of the lower end of the first moving iron core 141, and the other end abuts against the flange portion 1522. The second elastic element 17 can serve as a secondary valve spring. In the closed valve state, it applies a sealing force to the valve stem 152 to keep it in contact with the second valve port 102. When the coil is energized and the valve is switched from open to closed mode, the sealing force of the secondary valve spring causes the second moving iron core 151 and the first moving iron core 141 to disengage smoothly and simultaneously applies a sealing force to the valve stem 152, so that the valve stem 152 can drive the second moving iron core 151 to move downward smoothly to close the second valve port 102.The second moving iron core 151 also includes a small-diameter portion 1512, a large-diameter portion 1513, and a second end face 1516. The small-diameter portion 1512 and the large-diameter portion 1513 are transitioned by a first step 1514. The second moving iron core 151 also has a second step 1515 inside. 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.

[0024] The safety drive device 10 also includes a third elastic element 18, which is sleeved on the first moving iron core 141. One end of the third elastic element 18 abuts against the first moving iron core 141, and the other end abuts against the first sealing part 143. Specifically, the third elastic element 18 is sleeved on the outer periphery of the small diameter part 1512, and one end abuts against the first step 1514, while the other end abuts against the bottom wall of the first sealing part 143. Here, the third elastic element 18 can serve as a return spring, and the elastic force of the third elastic element 18 is greater than the weight of the second moving iron core 151. The third elastic element 18 can overcome the gravity of the second moving iron core 151, allowing the second moving iron core 151 to abut against the first moving iron core 141. By setting the third elastic element 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 stationary 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 thus driving the second sealing part 153 to rise together and smoothly open the second valve port 101.

[0025] Furthermore, the safety drive device 10 also includes a first magnetic conductor 20a, which is generally a cylindrical part with a flange. The first magnetic conductor 20a is sleeved on the outer periphery of the second outer sleeve 19b. The first magnetic conductor 20a includes a first straight section 21a and a first flange 22a. The lower end face of the first flange 22a abuts against the outer shell 11, and the upper end face abuts against the coil frame 121. The first flange 22a is embedded in the gap formed between the coil frame 121 and the outer shell 11. The outer wall of the first straight section 21a can be connected to the coil frame 121. When the coil is energized, part of the magnetic force is transmitted through the upper part of the outer shell 11 to the second stationary iron core 13b, and another part is transmitted through the lower part of the outer shell 11 to the first moving iron core 141 and the second moving iron core 151. Due to the setting of the first magnetic conductor 20a, the portion from the outer shell protrusion 111 to the first straight section 21a of the outer shell 11 has electromagnetic force, the magnetic field area increases, and thus the electromagnetic force increases to form a stronger electromagnetic circuit, causing the first moving iron core 141 to drive the second moving iron core 151 to move upward to open the first valve port and the second valve port.

[0026] It should be noted that the third elastic element 18 can also be omitted in this embodiment. In this case, the second moving iron core 151 can resist the step of the valve stem 152 due to gravity, since it is not affected by the force of the third elastic element 18. In order to ensure that the first moving iron core 141 and the second moving iron core 151 can be attracted smoothly when the electromagnetic coil is energized, so that the second moving iron core 151 drives the valve stem 152 to rise 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 stationary iron core 13, and the same technical effect can still be achieved.

[0027] The driving principle of the safety drive device is briefly introduced below. As shown in the figure, the safety drive device is in the closed valve position. At this time, the coil 12 is de-energized, the first moving iron core 141 is relatively far away from the second stationary iron core 13b, the first sealing part 143 closes the first valve port 101, the second sealing part 153 closes the second valve port 102, and the third elastic element 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, under the influence of 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. Then, the first moving iron core 141 drives the first sleeve part 142, the first sealing part 143, and the second moving iron core 151 to rise together towards the second stationary iron core 13b to overcome the elastic force of the first elastic element 16, i.e., the main valve spring. The first sealing part 143 opens the first valve port 101. At the same time, as the second moving iron core 151 rises upward, the second step 1515 gradually approaches the flange part 1522. The gap L1 formed between the flange part 1522 and the second step 1515 gradually disappears until the flange part 1522 and the second step 1515 abut against each other. The second moving iron core 151, along with the valve stem 152, rises upward together. The second sealing part 153 opens the second valve port 102 until a... Figure 3The first moving iron core 141 and the second stationary iron core 13b are attracted together, and the safety drive device is in the open valve position. It should be noted that a gap L1 is set between the valve stem 152 and the second moving iron core 151 because there is an unavoidable positional difference during the product manufacturing process, such as between the first valve port 101 and the second valve port 102. When there is no gap L1 between them, there is a possibility that the second valve port 102 may not close properly, 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, ensuring the sealing safety of the two valves. In addition, if there is no gap between them, the valve stem 152 may easily move the second moving iron core 151 downwards. At the moment of power-on, the first moving iron core 141 may preferentially attract the stationary iron core 13b. Due to the fast attraction speed, the second moving iron core 151 cannot respond quickly and follow the movement of the first moving iron core 141, thus failing to open the second valve port 102 smoothly.

[0028] When the safety drive device is in the open valve position, the coil 12 is energized. The first moving iron core 141 abuts against the second stationary iron core 13b, the flange 1522 abuts against the second step 1515, and the first moving iron core 141 abuts against the second moving iron core 151. The first sealing part 143 of the valve stem is relatively far away from the first valve port 101, and the second sealing part 153 is relatively far away from the second valve port 102. When the coil 12 starts to switch to the de-energized state, the first moving iron core 141 and the second stationary iron core 13b begin to disengage, and the second moving iron core 151 abuts against the first moving iron core 141. Therefore, the second moving iron core 151 also closes along with the first moving iron core 141. Due to the force of the second elastic element 17, i.e., the valve sealing elasticity, the second core assembly 15 closes before the first core assembly 141. When the valve is closed, the second valve port 102 closes first, followed by the first valve port 101. Under the action of the second elastic element 17, the second moving iron core 151 separates from the first moving iron core 141, forming a certain gap. Under the sealing force applied by the second elastic element 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 part 153 closes the second valve port 102, the valve stem 152 remains stationary due to the sealing action. The first moving iron core 141 pushes the second moving iron core 151 to continue moving downward, gradually eliminating the gap formed between the second moving iron core 151 and the first moving iron core 141, so that the valve stem 152 and the second moving iron core 151 form a gap L1. Finally, the first sealing part 143 closes the first valve port 101.

[0029] It should be noted that other corresponding modifications can be made to the part of this safety drive device near the stationary iron core, as described below. Figure 3The structure of the second safety control device for the gas proportional valve provided by the present invention differs from the aforementioned safety drive control device in that the structure near the stationary iron core is further modified. This safety drive device for the gas proportional valve also includes a first stationary iron core 13a and a first outer sleeve 19a. The first stationary iron core 13a can be fixedly connected to or limited by the outer casing 11. The first stationary iron core 13a includes a generally U-shaped recess 131a and a downwardly extending wall portion 132a. At least a portion of the first outer sleeve 19a is located within 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 a gap is formed between the closed end 191a and the wall portion 132a. The first outer sleeve 19a is made of non-magnetic (non-conductive) metal material and is roughly cylindrical. It is used to guide the axial movement of the first core assembly 14 and ensure the airtightness of the valve body. The first moving iron core 141 can carry the first sleeve part 142 and the first sealing part 143 to move axially up and down along the wall of the first outer sleeve. The safety drive device includes a receiving cavity A', which is formed by the inner cavity of the first outer sleeve 19a. The safety drive device 10 is energized by the winding of the coil 12. A closed annular magnetic circuit can be formed by the outer shell 11, the first magnetic conductor 20a, the first stationary iron core 13a, the first moving iron core 141, and the second moving iron core 151. When the coil is energized, the magnetic field passes through the outer shell. 11 is conducted to the first magnetic conductor 20a and the first stationary iron core 13a. The magnetic poles at the end of the first magnetic conductor 20a are conducted to the first moving iron core 141 and the second moving iron core 151 through the gap. At the moment the coil 12 is energized, because the first stationary iron core 131a and the first moving iron core 141 are relatively close, that is, the first moving iron core 141 is relatively close to the wall 132a of the first stationary iron core 131a and the joint of the two is roughly U-shaped, it helps to improve the initial attraction 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 bring the first sleeve part 142 and the first sealing part 143 together to the first stationary iron core 131a and attract them. The magnetic force is conducted through the first moving iron core 141. The electromagnetic field forms a magnetic circuit with the wall 132a of the first stationary iron core 131a, and then forms an attractive electromagnetic circuit with the end face of the first moving iron core 141 through the U-shaped end face. In this embodiment, the valve stem 152' includes a flange 1522' and a valve stem body 1523'. The flange 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 1522' protrudes circumferentially from the valve stem body 1523'. In the closed state, the first sealing part 143 closes the first valve port 101, and the second sealing part 153 closes the second valve port 102. A gap is formed between the flange 1522' and the second step 1515. The 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 their operating principles in the energized or de-energized states, have been described in detail in the first embodiment and will not be repeated here.

[0030] The following is combined with Figure 4 The structure of the third safety control device for the gas proportional valve provided by the present invention differs from that of the second safety control device in that the static iron core component is omitted in this embodiment, and a magnetic conductor is used to replace the magnetic conduction function 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. The first flange 22a is embedded in the first flange 22a. The first straight section 21a can abut against the inner wall of the coil frame 121. The second magnetic conductor 20b includes a second straight section 21b, a second flange 22b, and a guide hole 23b. The first moving iron core includes a cone 24b. A magnetic gap S3 is formed between the cone 24b and the second straight section 21b of the second magnetic conductor 20b. The closed end 191a extends into the guide hole 23b. A gap S3 is formed between the upper end of the coil frame 121 and the outer shell 11. There is a second gap S2, and the second flange 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 is equivalent to a stationary iron core. When the coil 12 is energized to generate excitation, a closed annular magnetic circuit is formed through the outer shell 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 outer shell 11. The magnetic pole at the end of the first magnetic conductor 20a is conducted to the second moving iron core 151. The moving iron core 151 abuts against the first moving iron core 141, and the electromagnetic force is conducted to the first moving iron core 141. A closed electromagnetic circuit is formed through the magnetic gap S3 between the first moving iron core 151 and the second magnetic conductor 20b. This causes the electromagnetic force on the second magnetic conductor 20b to attract the first moving iron core 151, causing the first moving iron core 151 to move towards the second magnetic conductor 20b to open the valve. It should be noted that the cone 24b is a tapered section with a gradually decreasing diameter in the axial direction towards the outer shell 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 in the second embodiment, and the specific structures of the first core assembly 14 and the second core assembly 15, as well as their operating principles under energized or de-energized conditions, have been described in detail in the first embodiment and will not be repeated here.

[0031] The gas proportional valve provided by this invention, when the coil 12 is de-energized, if the first moving iron core 141 and the second stationary iron core 13b cannot disengage and remain attracted or are accidentally stuck, the second moving iron core 151 disengages from the first moving iron core 141 under the sealing force of the second elastic element 17. The valve stem 152 can still drive the second moving iron core 151 to move downward until the second sealing part 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 and ensure safety. 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.

[0032] The following is combined with Figures 5-6The first embodiment of the proportional adjustment device 20 is described in detail. The proportional adjustment device 20 includes a receiving cavity B, a stationary iron core 21, an adjusting valve stem 22, a moving iron core 23, an elastic element 25, and a diaphragm assembly 24. The moving iron core 23 and the adjusting valve stem 22 can be relatively close to or far from the stationary iron core 21 as a single moving iron core assembly. At least a portion of the stationary iron core 21, at least a portion of the moving iron core 23, and at least a portion of the adjusting valve stem 22 are located in the receiving cavity B. The adjusting valve stem 22 can be made of metal or plastic and fixedly connected to the moving iron core, or it can be an integral structure. The proportional adjustment device 20 also includes a housing 29, a coil component, and a sleeve 28. The coil component is located on the outer periphery of the stationary iron core 21 and the moving iron core 23. The housing 29 is located on the upper part of the stationary iron core 21. The outer casing 29 is fixedly connected or limited in one end. In this embodiment, the outer casing 29 has an opening on its upper part, and the stationary iron core 21 has an upward-facing boss. The boss is adapted to the opening, and the bottom wall of the outer casing 29 abuts against the peripheral wall of the boss. The outer casing 29 generally covers the coil components. The moving iron core 23 is located below the stationary iron core 21 and is relatively close to the diaphragm assembly 24. The sleeve 28 is fixedly connected to the stationary iron core 21 by welding or other means, or limited in one end by dotting. The regulating valve rod 22 can move the moving iron core 23 axially up and down along the sleeve wall. The stationary iron core 21 includes a first recess 21a, and the elastic member 25 is located in the recess 21a. In this embodiment, part of the regulating valve rod 22 is located on the upper part of the moving iron core 23. The end face extends into the inner cavity of the first recess 21a. The side wall of the first recess 21a guides the regulating valve stem 22. One end of the elastic member 25 abuts against the top wall of the first recess 21a, and the other end is sleeved on the outer periphery of the protrusion of the regulating valve stem 22 and abuts against the step of the regulating valve stem 22. Alternatively, the elastic member 25 can be appropriately extended outside the first recess 21a to abut against the regulating valve stem 22, achieving the same technical effect. It should be noted that the abutment described in the specification includes direct and indirect abutment. The elastic member 25 can also achieve indirect abutment against the stationary iron core 21 and the regulating valve stem 22 through additional components such as anti-friction plates. Furthermore, the regulating valve stem 22 can also be enclosed... The valve includes a stop, and the regulating valve stem is fixedly connected or limited to the stop. The elastic element 25 can directly abut against the regulating valve stem or indirectly abut against the regulating valve stem through the stop. The lower end of the regulating valve stem 22 is fixedly connected or limited to the diaphragm assembly 24. The diaphragm assembly 24 includes a spring seat 27, a first spring 26, a diaphragm 241, and a sealing part 242. The sealing part 242 can approach or move away from the valve port 103. The spring seat 27 can be formed of flexible rubber material and is tightly fitted to the lower end of the regulating valve stem 22 through deformation. One end of the first spring 26 abuts against the spring seat 27 and the other end abuts against the sealing part 242. It should be noted that the regulating valve stem 22 can also be fixedly connected to the spring seat 27 by means of interference fit or other methods.

[0033] The gas proportional valve provided by this invention also includes a safety control device 10 and a differential pressure regulating device 30, as well as a body 1 and a first valve port 101 and a second valve port 102 located within the body. The body 1 has a flow channel 151, which includes a first flow channel 151a, a second flow channel 151b, and a third flow channel 151c. The first flow channel 151a is close to the safety control device and one end is connected to the second valve port 102. One end of the second flow channel 151b is connected to the valve port 103. The third flow channel 151c is close to the differential pressure regulating device 30 and one end is connected to the back pressure chamber 31 of the differential pressure regulating device. The first flow channel 151a, the second flow channel 151b, and the third flow channel 151c are interconnected. When the outlet pressure of the gas proportional valve needs to achieve a lower pressure regulation mode... When the coil component of the proportional adjustment device 20 is energized, under the excitation action, the moving iron core 23 moves upward toward the stationary iron core 21 along with the regulating valve rod 22 to get closer to the stationary iron core 21. The elastic element 25 is compressed, and the spring seat 27 also moves upward along with the regulating valve rod 22. The spring force of the first spring 26 located between the spring seat 27 and the sealing part 242 is weakened. The diaphragm assembly 24 moves away from the valve port 103 and forms a first distance L1 with it. The opening of the valve port 103 increases. Part of the pressure accumulated in the flow channel 151 flows from the valve port 103 to the outlet 1b through the pressure relief channel 17. The pressure in the back pressure chamber 31 of the differential pressure adjustment device 30 also decreases. The opening of the main valve port 32 gradually decreases. The gas flow from the main valve port 32 to the outlet 1b decreases to achieve a lower outlet pressure adjustment mode.Conversely, when the outlet pressure of the gas proportional valve needs to achieve a higher pressure regulation mode, the coil component of the proportional regulation device 20 is de-energized, the electromagnetic force disappears, and under the valve sealing force of the elastic element 25, the regulating valve stem 22 moves downward with the moving iron core 23 away from the stationary iron core 21. To ensure the smooth operation of the proportional regulation device, it should be noted that the valve sealing force of the elastic element 25 is greater than the elastic force of the first spring 26. The diaphragm assembly 24 is relatively close to the valve port 103 and forms a second distance L2 with it. The sealing part 242 is relatively close to the valve port 103, and the opening of the third valve port 103 decreases accordingly. The first distance L1 is greater than the second distance L2. Under the pressure action, the pressure accumulated in the flow channel 151 increases accordingly, and the pressure in the back pressure chamber 31 of the differential pressure regulating device 30 also increases accordingly. The differential pressure diaphragm 33... The spring force of the main valve spring 34 pushes the differential pressure valve stem, causing the main valve sealing part 35 to open the main valve port 32. This increases the gas flow rate from the main valve port 32, achieving a higher outlet pressure regulation mode. Gas enters the flow channel 151 through the first valve port 101 and the second valve port 102. As the distance between the diaphragm assembly 24 and the valve port 103 changes (i.e., the opening of the valve port 103 increases or decreases), it affects the pressure change within the flow channel 151. This pressure change directly affects the pressure change in the back pressure chamber 31 of the differential pressure regulating device, ultimately influencing the gas flow rate from the main valve port of the differential pressure regulating device 30. This achieves either a high-pressure or low-pressure outlet pressure regulation mode for the gas proportional valve. The overall structure of this gas proportional valve is optimized and relatively simple, and it can achieve two outlet pressure regulation modes.

[0034] The following is combined with Figure 7 This invention introduces a second embodiment of the gas proportional valve, which differs from the first embodiment in that the upper end of the regulating valve stem 22 is lower than the upper end face of the moving iron core 23. The upper end face of the moving iron core 23 is approximately planar. The upper end of the elastic element 25 abuts against the top wall of the first recess 21a, and the other end can directly abut against the upper end face of the moving iron core 23. When energized, the moving iron core 23 moves upward and closer to the stationary iron core 21 under the action of electromagnetic force. The elastic element 25 is compressed, and the moving iron core 23 moves upward along with the regulating valve stem 22. The diaphragm assembly 24 moves upward and gradually moves away from the valve port 103, forming a first distance from the valve port. When energized, the elastic element 25 applies a sealing force to the moving iron core 23, causing the moving iron core 23 to separate from the stationary iron core 21. The moving iron core 23 moves downward with the regulating valve rod 22, and the diaphragm assembly 24 moves downward and gradually approaches the valve port 103, forming a second distance from the valve port. This affects the opening degree of the valve port 103, thereby realizing the high-pressure or low-pressure outlet pressure regulation mode of the gas proportional valve, and also achieving the technical effect of the present invention.

[0035] The following is combined with Figure 8The present invention introduces a third embodiment of the gas proportional valve provided by the present invention. In this embodiment, the stationary iron core 21 has a first protrusion 21b that protrudes downward, at least a portion of the elastic member 25 is sleeved on the outer periphery of the first protrusion 21b and its upper end abuts against the peripheral wall of the protrusion, and the moving iron core 23 includes a second recess 23a that is recessed toward the diaphragm assembly, and the lower end of the elastic member 25 is sleeved on the outer periphery of the regulating valve stem and abuts against the bottom wall of the second recess 23a.

[0036] The following is combined with Figure 9 The present invention introduces a fourth embodiment of the gas proportional valve provided by the present invention. In this embodiment, the structure of the stationary iron core is different from that of the previous three embodiments. It has neither a first protrusion nor a first recess. The lower end of the stationary iron core 21 is a flat part. The stationary iron core includes a horizontal lower bottom wall. The moving iron core includes a second recess 23a. The upper end of the regulating valve rod 22 is located in the second recess 23a and is lower than the upper end surface of the moving iron core. The upper end of the elastic member 25 abuts against the lower bottom wall, and the other end abuts against the regulating valve rod. Alternatively, the other end of the elastic member 25 is sleeved on the outer periphery of the regulating valve rod 22 and abuts against the bottom wall of the second recess 23a.

[0037] In addition, the proportional adjustment device of the gas proportional valve provided by the present invention can also eliminate the setting of the adjusting valve stem, so that the proportional adjustment device includes a stationary iron core, a moving iron core, an elastic element, and a diaphragm assembly. The moving iron core is located below the stationary iron core and can approach or move away from the stationary iron core. The lower end of the moving iron core includes a second protrusion. The moving iron core and the second protrusion can be integrally formed as a whole component or fixedly connected or limitedly connected to the second protrusion 23b. The second protrusion 23b is fixedly connected or limitedly connected to the diaphragm assembly 24. One end of the elastic element abuts against the stationary iron core and the other end abuts against the moving iron core. The proportional adjustment device also includes a housing and a coil component. The housing is fixedly connected or limitedly connected to the upper end of the stationary iron core. When the coil component is energized, the moving iron core moves upward to approach the stationary iron core, and the diaphragm assembly moves away from the valve port and forms a first distance from the valve port. When the coil component is de-energized, the moving iron core moves downward to move away from the stationary iron core, and the diaphragm assembly moves closer to the valve port and forms a second distance from the valve port. The first distance is greater than the second distance.

[0038] The following is combined with Figure 10 The present invention introduces a fifth embodiment of the gas proportional valve provided by the present invention. In this embodiment, the regulating valve stem 22 is omitted. The stationary iron core 21 includes a first recess 21a. At least a portion of the elastic member 25 is located in the first recess 21a, that is, one end of the elastic member 25 abuts against the top wall. At least another portion of the elastic member 25 is located in the second recess 23a and the lower end of the elastic member 25 abuts against the bottom wall of the second recess 23a.

[0039] The following is combined with Figure 11The present invention introduces a sixth embodiment of the gas proportional valve provided by the present invention. In this embodiment, the regulating valve stem 22 is omitted. The stationary iron core 21 has a first protrusion 21b that protrudes downward. At least a portion of the elastic member 25 is sleeved on the outer periphery of the first protrusion 21b and abuts against the upper end of the protrusion peripheral wall. The lower end of the elastic member 25 abuts against the bottom wall of the second recess 23a.

[0040] The following is combined with Figure 12 The present invention introduces a seventh embodiment of the gas proportional valve provided by the present invention. In this embodiment, the moving iron core 23 includes an upwardly protruding third protrusion 23c, the stationary iron core 21 includes a first recess 21a, at least a portion of the elastic member 25 is located in the first recess 21a, that is, one end of the elastic member 25 abuts against the top wall, and at least another portion of the elastic member 25 is sleeved on the outer periphery of the third protrusion 23c and abuts against the moving iron core 23.

[0041] The gas proportional valve provided by this invention integrates two independent proportional adjustment devices into one unit through optimized design of the proportional adjustment device structure. The valve opening is controlled by the distance between the diaphragm assembly and the valve port, thereby affecting the pressure in the flow channel. By cooperating with the differential pressure adjustment device, the gas proportional valve can achieve two outlet pressure modes: high pressure and low pressure. This relatively reduces the number of parts, making the overall structure of the gas proportional valve optimized and simple.

[0042] This invention integrates two independent proportional adjustment devices and a safety drive device into one unit. After the gas enters through the first valve port 101 and the second valve port 102, the gas flow rate can be directly adjusted and controlled by the proportional adjustment device. The gas proportional valve mechanism provided by this invention simplifies and optimizes the overall structure of the gas proportional valve, and enables the adjustment of two outlet pressures.

[0043] It should be noted that the gas proportional valve provided by this invention focuses on protecting the structure of the proportional adjustment device. The structure of the safety drive device and its actual application can be flexibly set according to actual market needs.

[0044] It should be noted that the ordinal numbers such as "first" and "second" and the directional terms such as "upper" and "lower" mentioned in this invention are all descriptions based on the accompanying drawings in the specification. They are merely used to distinguish the naming methods of different components and should not be considered as limiting the order of the components. The above are only preferred embodiments of this invention. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from this invention, and these improvements and modifications should also be considered within the scope of protection of this invention.

Claims

1. A gas proportional valve characterized by, The valve includes a valve port and a proportional adjusting device, the proportional adjusting device includes a static core, a dynamic core, an adjusting valve rod, an elastic member and a diaphragm assembly, the adjusting valve rod is fixedly connected with the dynamic core or is an integral structure, the dynamic core is located below the static core, the dynamic core can approach or move away from the static core with the adjusting valve rod, the lower end of the adjusting valve rod is fixedly connected or limitingly connected with the diaphragm assembly, one end of the elastic member abuts against the static core, and the other end abuts against the adjusting valve rod or the dynamic core, the proportional adjusting device further includes a coil component, when the coil component is powered, the dynamic core moves upward with the adjusting valve rod to approach the static core, the diaphragm assembly relatively moves away from the valve port and forms a first distance with the valve port, when the coil component is powered off, the dynamic core moves downward with the adjusting valve rod to move away from the static core, and the diaphragm assembly relatively approaches the valve port and forms a second distance with the valve port, the first distance is greater than the second distance. The diaphragm assembly includes a spring seat, a first spring, a sealing part and a diaphragm, the sealing part can approach or move away from the valve port, the lower end of the adjusting valve rod is embedded in the spring seat, and one end of the first spring abuts against the spring seat and the other end abuts against the sealing part. The sealing valve force of the elastic member is greater than the elastic force of the first spring.

2. Gas proportional valve according to claim 1, characterized in that The static core includes a first recess, and at least part of the elastic member is located in the recess, or the static core includes a first protruding part, and at least part of the elastic member is sleeved on the outer periphery of the first protruding part.

3. Gas proportional valve according to claim 2, characterized in that The recess includes a top wall, the upper end of the elastic member abuts against the top wall, the upper end of the adjusting valve rod extends into the inner cavity of the first recess, the side wall of the first recess provides a guiding effect on the adjusting valve rod, and the lower end of the elastic member is sleeved on the outer periphery of the protruding part of the adjusting valve rod and abuts against the step of the adjusting valve rod.

4. Gas proportional valve according to claim 2, characterized in that The first recess includes a top wall, the upper end of the elastic member abuts against the top wall, and at least another part of the elastic member extends out of the first recess, the upper end surface of the dynamic core is substantially planar, the upper end of the adjusting valve rod is lower than the upper end surface of the dynamic core, and the lower end of the elastic member abuts against the upper end surface of the dynamic core.

5. Gas proportional valve according to claim 2, characterized in that The upper end of the elastic member abuts against the circumferential wall of the first protruding part, and the dynamic core further includes a second recess, and the lower end of the elastic member is sleeved on the outer periphery of the adjusting valve rod and abuts against the bottom wall of the second recess.

6. The gas proportional valve according to claim 1, characterized in that The static core includes a planar lower end bottom wall, the dynamic core includes a second recess, the upper end of the adjusting valve rod is located in the second recess and is lower than the upper end surface of the dynamic core, the upper end of the elastic member abuts against the lower end bottom wall, and the other end abuts against the adjusting valve rod or the bottom wall of the second recess.

7. Gas proportional valve according to any of claims 1 to 6, characterized in that The proportional adjusting device comprises a containing cavity, at least part of the static iron core, at least part of the adjusting valve rod and at least part of the dynamic iron core are located in the containing cavity, the proportional adjusting device further comprises a sleeve, the sleeve is fixedly connected or positionally connected with the static iron core, the dynamic iron core can move axially along the sleeve wall of the sleeve with the adjusting valve rod.

8. Gas proportional valve according to any of claims 1 to 6, characterized in that The gas proportional valve further comprises a safety control device and a differential pressure adjusting device, the gas proportional valve comprises a body and a first valve port and a second valve port located in the body, further comprises a flow channel, the flow channel comprises 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 of the first flow channel is communicated with the second valve port, one end of the second flow channel is communicated with the valve port, the third flow channel is close to the differential pressure adjusting device and one end of the third flow channel is communicated with the back pressure cavity of the differential pressure adjusting device, the first flow channel, the second flow channel and the third flow channel are communicated with each other.

9. A gas proportional valve characterized by The proportional adjusting device comprises a static iron core, a dynamic iron core, a elastic member and a diaphragm assembly, the dynamic iron core is located below the static iron core, the dynamic iron core can approach or move away from the static iron core, the lower end of the dynamic iron core comprises a second protruding part, the second protruding part is fixedly connected or positionally connected with the diaphragm assembly, one end of the elastic member abuts against the static iron core and the other end abuts against the dynamic iron core, the proportional adjusting device further comprises a coil part, when the coil part is energized, the dynamic iron core moves upward to approach the static iron core, the diaphragm assembly relatively moves away from the valve port and forms a first distance with the valve port, when the coil part is de-energized, the dynamic iron core moves downward to move away from the static iron core, the diaphragm assembly relatively approaches the valve port and forms a second distance with the valve port, the first distance is greater than the second distance. The diaphragm assembly comprises a spring seat, a first spring, a sealing part and a diaphragm, the sealing part can approach or move away from the valve port, the lower end of the second protruding part is embedded in the spring seat, one end of the first spring abuts against the spring seat and the other end abuts against the sealing part. The valve sealing force of the elastic member is greater than the elastic force of the first spring.

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