A gas proportional valve

Abstract

The gas proportional valve provided by the present invention, through the optimized design of the proportional adjustment device, includes a static iron core, a moving iron core, a regulating valve rod and a diaphragm assembly. The moving iron core is fixedly connected to or integrated with the regulating valve rod and is located above the static iron core. When the proportional adjustment device is powered on, the diaphragm assembly relatively approaches the valve port to form a first distance. When the proportional adjustment device is powered off, the diaphragm assembly relatively moves away from the valve port and forms a second distance, and the second distance is greater than the first distance, thereby affecting the valve port opening degree, and the low-pressure outlet pressure adjustment mode of the gas proportional valve can be realized.

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 driving device, a proportional regulating device, and a differential pressure regulating device. Among them, the safety control device is used to control the opening and safe closing of the gas flow passage. Usually, two independent solenoid valves are used to open or close two valve ports. The electromagnetic driving device cooperates with two independently arranged proportional regulating devices to adjust the opening degree of the main valve port of the differential pressure regulating device, so as to realize the high-pressure or low-pressure outlet pressure regulating mode of the gas proportional valve. Summary of the Invention

[0003] The main purpose of the present invention is to provide a gas proportional valve with a new structure, which can also realize the high-pressure or low-pressure two outlet pressure regulating modes of the gas proportional valve.

[0004] The present invention provides a gas proportional valve, including a valve port and a proportional regulating device. The proportional regulating device includes a static iron core, a moving iron core, a regulating valve rod, and a diaphragm assembly. The moving iron core is located above the static iron core. The moving iron core is fixedly connected or integrally structured with the regulating valve rod. The lower end of the regulating valve rod is fixedly connected or limitedly connected to the diaphragm assembly. The moving iron core can drive the regulating valve rod to approach or move away from the static iron core. The proportional regulating device further includes a housing part and a coil component. When the coil component is energized, the moving iron core drives the regulating valve rod to move downward to approach the static iron core, and the diaphragm assembly relatively approaches the valve port and forms a first distance with the valve port. When the coil is powered off, the moving iron core drives the regulating valve rod to move upward to move away from the static iron core, and the diaphragm assembly relatively moves away from the valve port and forms a second distance with the valve port. The second distance is greater than the first distance.

[0005] The gas proportional valve provided by the present invention realizes the high-pressure or low-pressure outlet pressure regulating mode of the gas proportional valve by optimizing the design of the structure of the proportional regulating device. When the coil component is energized, the diaphragm assembly relatively approaches the valve port and forms a first distance with the valve port. When the coil component is powered off, the diaphragm assembly relatively moves away from the valve port and forms a second distance with the valve port. The second distance is greater than the first distance. 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 2 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-open state;

[0008] Figure 3 Schematic cross-sectional structure diagram of the safety control device for 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 for 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 Schematic structure diagram of the proportional adjustment valve device of the gas proportional valve provided by the present invention in the power-off or power-on mode state;

[0012] Figure 7 For the application provided by the present invention Figure 3 Schematic overall structure diagram of the gas proportional valve with the structure; Specific implementation manners

[0013] As Figure 7 The shown gas proportional valve 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 flows out from the outlet 1b. The main body 1 can be formed by die-casting of aluminum alloy. The main body 1 is provided with a first valve port 101, a second valve port 102, and a 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.

[0014] 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 flow channel of the gas proportional valve, used to control the opening and safe closing of the gas flow channel, and can effectively prevent gas leakage. The proportional adjustment device 20 includes a static iron core 21, an adjustment valve rod 22, a moving iron core 23 and a diaphragm assembly 24. The adjustment valve rod 22 is fixedly connected to the moving iron core 23 or is an integral structure, and the moving iron core 23 is located above the static iron core 21 and relatively close to the top wall of the housing member 29. The housing member 29 is fixedly connected or limitedly connected to the lower end of the static iron core 21. The coil component is located on the outer periphery of the static iron core and the moving iron core and is generally covered by the magnetically conductive housing member 29. When it is necessary to adjust the outlet pressure 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 main gas flow 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 adjustment valve rod 22 can drive the moving iron core 23 to approach the static iron core 21 together. The diaphragm assembly 24 moves relatively close to the valve port 103 and forms a first distance with the valve port. The opening of the valve port 103 decreases. Under the action of pressure, the pressure in the flow 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 port 32 by the main valve sealing portion 35. The opening of the main valve port 32 increases, and the gas flow rate flowing from the main valve port 32 to the outlet 1b increases to form a high-pressure outlet pressure adjustment mode. On the contrary, when the proportional adjustment device 20 is powered off, the electromagnetic force disappears, the adjustment valve rod 22 drives the moving iron core 23 to gradually move away from the static iron core 21, the diaphragm assembly 24 moves relatively away from the valve port 103 and forms a second distance with the valve port. The second distance is greater than the first distance. The valve opening increases, the pressure accumulated in the flow channel 151 decreases, the pressure in the back pressure chamber 31 of the differential pressure adjustment device 30 decreases, the opening 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-pressure outlet pressure adjustment mode. In the present invention, by integrating the structures of two independent proportional adjustment devices and an electromagnetic drive device in the background art, after the gas enters from the first valve port 101 and the second valve port 102, the distance between the diaphragm assembly and the valve port can be controlled by making the proportional adjustment device in the powered-off or powered-on state, thereby affecting the valve opening, and further realizing the adjustment of the high-pressure or low-pressure outlet pressure of the gas proportional valve. The gas proportional valve mechanism provided by the present invention simplifies and optimizes the overall structure of the gas proportional valve, and can realize the adjustment of two outlet pressures.

[0015] The following is combined with Figures 1-2The 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, it forms two-stage core components to control the valve ports 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.

[0016] The following is combined with Figure 3The first structure of the safety control structure of the gas proportional valve provided by the present invention is introduced in detail. In this embodiment, the safety drive device 10 of the gas proportional valve can be fixedly connected to the main body 1 by means of screws or the like. The safety drive device 10 includes a magnetically conductive shell 11, a coil 12, a second static iron core 13b and a second outer sleeve 19b. The second outer sleeve 19b is located in the inner hole of the coil 12. At least a portion of the second outer sleeve 19b is fixedly connected or limit-connected to the second static iron core 13b. The second outer sleeve 19b and the second static iron core 13b roughly define a accommodating cavity A of the safety drive device 10. The second static iron core 13b includes a conical portion 131b. The second outer sleeve 19b is roughly a cylindrical tube with openings on both the upper and lower sides. The upper end of the second outer sleeve 19b is fixedly connected or limit-connected to the outer wall of the second static iron core 13b. The coil skeleton 121 is located at the outer periphery of the second static iron core 13b and the second outer sleeve 19b. The coil 12 is wound on the coil skeleton 121, and the shell 11 roughly covers the coil 12 as a whole. The safety drive device 10 also includes a first core assembly 14, a second core assembly 15, a first elastic member 16 and a second elastic member 17. The first core assembly 14 includes a first moving iron core 141, a first sleeve portion 142 and a first sealing portion 143. The first moving iron core 141 includes a recessed portion, which is adapted to the conical portion 131b, wherein the first sleeve portion 142 is fixedly connected or limit-connected to the first moving iron core 141, and the lower end of the first sleeve portion 142 is engaged 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 and lowering movement in the accommodating chamber A to make the first sealing portion 143 approach or move away from the first valve port 101. The first moving iron core 141 can perform axial lifting and lowering movement along the second outer sleeve wall of the second outer sleeve 19b. The safety control device also includes a first cavity, a first sleeve portion 142 and a first sealing portion 143. A sleeve portion 142 and a first sealing portion 143 roughly 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, at least part of the second moving iron core 151 is located in the first cavity and can move axially along the sleeve wall of the first sleeve portion 142, 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 limit-connected with the second sealing portion 153, at least part of the valve stem 152 extends into the through hole 1511, the valve stem 152 can drive the second moving iron core 151 to move downward so that the second sealing portion 153 closes the second valve port 102, at least part of the second elastic member 17 is located in the through hole 1511 and one end of the second elastic member 17 abuts against the first moving iron core 141 and the other end abuts against the valve stem 152.

[0017] Specifically, the first valve port 101 and the second valve port 102 are coaxially arranged. To ensure the sealing performance, the second static iron core 13b can be fixedly connected with an O-ring 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 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 embedded and fitted with the flanging of the first sleeve 142 and the lower end of the valve stem 152. In this embodiment, the lower end of the first sleeve 142 or the valve stem 152 is connected to the first sealing portion and the second sealing portion by a limiting method. Specifically, 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 and is tightly fitted with it. In addition, the lower end of the first sleeve 142 or the valve stem 152 can also be fixedly connected to the first sealing portion or the second sealing portion by interference fit or other means. 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 protruding portion 1433 protruding towards the static iron core 13. One end of the first elastic member 16 is sleeved on the outer peripheral portion of the first protruding portion 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 portion 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 in the closed state, it exerts a valve-sealing force on the first sealing portion 143 to keep it in cooperation with the first valve port 101. It should be noted that in order to enable the first sealing portion 143 to close the first valve port 101, the elastic force of the first elastic member 16 needs to be set to be greater than the sum of the elastic force of the second elastic member 17 and the valve-sealing force of 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 greater than the diameter of the upper rod portion 1521. Of course, the valve stem can also be set to an equal-diameter structure with the same 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 at least partially 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 protruding portion 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, which exerts a valve-sealing force on the valve stem 152 in the closed valve state to keep it in cooperation with the second valve port 102. And when the coil is energized and starts to switch from the open valve mode to the closed valve mode,Through the valve closing force of the auxiliary 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. It should be noted that in order to ensure that the valve stem 152 can drive the second moving iron core 151 to smoothly close the second valve port downward, the elastic force of the second elastic member 17 needs to be set greater than the elastic force of the third elastic member 18. 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 at 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.

[0018] 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 thereof 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, since 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.

[0019] Furthermore, the safety drive device 10 further includes a first magnetic conductor 20a, which is generally in the shape of a flanged cylindrical portion. 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 flanged section 22a. The lower end surface of the first flanged section 22a abuts against the outer shell 11, and the upper end surface abuts against the coil bobbin 121. The first flanged section 22a is embedded in the gap formed between the coil bobbin 121 and the outer shell 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 outer shell 11, and the other part is transmitted to the first moving iron core 141 and the second moving iron core 151 through the lower part of the outer shell 11. Due to the arrangement of the first magnetic conductor 20a, the part from the outer shell protrusion 111 of the outer shell 11 to the first straight section 21a has electromagnetic force, and the magnetic conduction area increases, so that 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.

[0020] It should be noted that in this embodiment, the third elastic member 18 can also be omitted. At this time, the second moving iron core 151 can abut against the step of the valve stem 152 due to the gravity without the action of the third elastic member 18. 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.

[0021] The driving principle of the safety driving device is briefly introduced as follows. As shown in the figure, the safety driving device is in the valve-closed 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 the second end face 1516 thereof abuts against the first end face 1410 of the first moving iron core 141. When the coil 12 starts to switch to the power-on state, 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 the first moving iron core 141 and the second static iron core 13b Figure 3 are attracted to each other, and the safety driving device is in the valve-open 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 are inevitably position differences in the product during the processing process, such as 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 is not closed in place, thus posing a safety hazard of gas leakage. The gap L1 is used to eliminate the position difference between the first valve port 101 and the second valve port 102 and ensure the sealing safety of the two valves. In addition, 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 preferentially attract the static iron core 13. Due to the fast attracting speed, the second moving iron core 151 cannot respond quickly and follow the movement of the first moving iron core 141, thus unable to open the second valve port 102 smoothly.

[0022] When the safety drive device is in the valve-opening position state, the coil 12 is energized at this time. The first moving iron core 141 abuts against the second static iron core 13b, the flange portion 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 portion 143 of the valve stem is relatively far away from the first valve port 101, and the second sealing portion 153 is relatively far away from the second valve port 102. When the coil 12 starts to switch to the power-off state, the first moving iron core 141 starts to disengage from the second static iron core 13b, and the second moving iron core 151 and the first moving iron core 141 are in an abutting state. 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-sealing elasticity, the second core assembly 15 closes the port earlier than the first core 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 action of the valve-sealing 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-sealing 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. Finally, the first sealing portion 143 closes the first valve port 101.

[0023] It should be noted that other corresponding changes can be made to the part of the safety drive 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-mentioned safety drive control device lies in the structure near the static iron core part. 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 fixedly connected or limitedly connected to the outer shell 11. The first static iron core 13a includes a recess 131a that is generally U-shaped and a wall portion 132a that extends downward. At least part of the first outer sleeve 19a is located in the inner hole of the coil 12 and includes a closed end 191a and an open end 192a. The closed end 191a is adapted to the recess 131a and the closed end 191a forms a clearance fit with the wall portion 132a. The first outer sleeve 19a is formed of a non-magnetic (non-magnetic-conducting) metal material and is generally cylindrical, and is 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 perform axial lifting movement 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 outer shell 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 magnetic circuit can be formed. When the coil is energized and excited, the magnetic field is conducted through the outer shell 11 to the first magnetic conductor 20a and the first static iron core 13a. The magnetic pole at the end of the first magnetic conductor 20a is 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 part 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 magnetic circuit guidance. The first moving iron core 141 can easily and smoothly drive the first sleeve portion 142 and the first sealing portion 143 to suck and approach the first static iron core 131a together. The electromagnetic field conducted by the first moving iron core 141 forms a magnetic circuit guidance with the wall portion 132a of the first static iron core 131a, and then 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 perform axial movement along the inner wall of the second moving iron core 151. The flange portion 1522' protrudes circumferentially from the valve stem body 1523'. In the closed state, the first sealing portion 143 closes the first valve port 101, and the second sealing portion 153 closes the second valve port 102. A gap is formed between the flange portion 1522' and the second step 1515. The relevant specific structures of the first magnetic conductor 20a, the first core assembly 14, and the second core assembly 15 in this embodiment 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.

[0024] 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. Both the first magnetic conductor 20a and the second magnetic conductor 20b are 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 this 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 is equivalent to the function of the static iron core. When the coil 12 is energized to generate excitation, a circular closed 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, so that 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, and the magnetic gap S3 can play a role in enhancing 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 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.

[0025] 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 stem 152 can still drive the second moving iron core 151 to move downward until the second sealing portion 153 closes the second valve port 102. That is, when the 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.

[0026] The following is combined with Figures 5-6A first embodiment of the proportional adjustment device 20 is introduced in detail. The proportional adjustment device 20 includes a receiving cavity B, a static 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 non-magnetic material and fixedly connected to the moving iron core or be an integral structure. The regulating valve rod 22 and the moving iron core 23 are made of two different materials. The regulating valve rod 22 is set as a non-magnetic material to prevent the top wall of the outer shell member 29 from attracting the regulating valve rod 22 when the proportional adjustment device is energized, so that the moving iron core 23 cannot drive the regulating valve rod 22 to move downward. The proportional adjustment device further includes a sleeve 28, an outer shell member 29, and a coil component. The coil component is located on the outer peripheral part of the static iron core 21. The outer shell member 29 has magnetic conductivity and generally surrounds the coil component. The outer shell member is fixedly connected or limitedly connected to the lower end of the static iron core. The sleeve 28 is fixedly connected or limitedly connected to the upper end of the static iron core 21, and the sleeve 28 and the static 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 integrally in an inverted convex shape and is located above the static iron core 21. When the coil component is energized, under the excitation effect, the moving iron core 23 drives the regulating valve rod 22 to move downward as a whole and gradually approaches the static iron core 21. The diaphragm assembly 24 moves downward accordingly and relatively approaches the valve port 103 and forms a first distance L1 with the valve port. At this time, the opening degree of the valve port 103 is small. The gas enters from the inlet 1a and then enters the flow channel 151 through the first valve port 101 and the second valve port 102. At this time, the flow channel pressure accumulated in the flow channel 151 is relatively high. Affected by the high pressure in the flow channel 151, the back pressure chamber pressure of the differential pressure adjustment device 30 also increases. The differential pressure diaphragm 33 overcomes the acting force of the main valve spring 34 to gradually open 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 decreases to form a high-pressure outlet pressure adjustment mode. When the coil component is de-energized, the excitation effect disappears. The moving iron core 23 drives the regulating valve rod 22 to move upward as a whole and gradually moves away from the static iron core 21. The diaphragm assembly 24 moves upward accordingly and gradually moves away from the valve port 103 and forms a second distance L2 with the valve port. At this time, the opening degree of the valve port 103 is large. The gas enters from the inlet 1a and then enters the flow channel 151 through the first valve port 101 and the second valve port 102. At this time, the flow channel accumulated in the flow channel 151 flows through the pressure relief channel 17 from the valve port 103 with a larger opening degree to the outlet of the gas proportional valve, and the pressure is released. The second distance L2 is greater than the first distance L1. The distance formed by the diaphragm assembly 24 and the valve 103 affects the opening degree of the valve port 103. The pressure in the flow channel 151 decreases, the pressure in the back pressure chamber 31 of the differential pressure adjustment device 30 decreases, and 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 to form a relatively low-pressure outlet pressure regulation mode. The structure of the regulating valve stem 22 of the proportional regulating device will be introduced in detail below. The regulating valve stem 22 includes a body portion 221, an upper end portion 222, and a lower end portion 223. It should be noted that in this embodiment, the upper end portion 222 and the lower end portion 223 are structures with diameters smaller than that of the body portion 221. It can also be set as a regulating valve stem structure with equal diameters, or a structure where the upper end portion 222 and the body portion 221 have equal diameters while the lower end portion 223 does not have the same diameter as the two. The specific structure of the regulating valve stem 22 is not limited here. The upper end portion refers to the part that extends from the upper end surface of the moving iron core 23 relatively close to the top wall of the outer shell member 29, and the lower end portion refers to the part that extends from the lower end portion of the stationary iron core 21 relatively close to the diaphragm assembly 24. When the coil component is powered off, the moving iron core 23 can drive the regulating valve stem 22 to move upward, and the upper end portion can abut against the top wall of the outer shell member 29 to limit the upward actuation of the moving iron core. The upper end portion 222 can approach or move away from the top wall of the outer shell member 29 as the moving iron core 23 moves axially up and down. The stationary iron core 21 includes a first recess 211, a first through hole 212, and a second recess 213. The first recess 211 is located at the upper position of the stationary iron core 21, the second recess 213 is located at the lower position of the stationary iron core 21, and the first through hole 212 can communicate the first recess 211 and the second recess 213. The moving iron core 23 includes a second through hole 231 and a protrusion 232. The protrusion 232 is a small-diameter portion with a diameter smaller than that of the large-diameter portion 233 of the moving iron core 23. The protrusion 232 is adapted to the first recess 211. When the coil component is powered on and under the excitation effect, the moving iron core 23 and the regulating valve stem 22 move downward together and are attracted to the stationary iron core 21, and the protrusion 232 can extend into the first recess 211. When the coil component is powered off and the excitation effect disappears, the moving iron core 23 and the regulating valve stem 22 move upward together and move relatively away from the stationary iron core 21, and the protrusion 232 moves relatively away from the first recess 211. The outer peripheral wall of the large-diameter portion 233 can move axially along the sleeve wall in the accommodation chamber B. The first through hole 212 and the second through hole 231 are coaxially arranged. The regulating valve stem 22 passes through the second through hole 231, the first recess 211, the first through hole 212, and the second recess 213 in sequence 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 recess 213. The stationary iron core 21 also includes a lower end 214, and the lower end 214 is fixedly connected to the outer shell 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 stem 22 can be fixedly connected or limit-connected to the diaphragm assembly 24. In this embodiment, the regulating valve stem 22 and the diaphragm assembly 24 are connected by a limiting method. The lower end portion 223 of the regulating valve stem 22 is embedded in the spring seat 243, and the spring seat 243 can be made of a flexible rubber material.The reference to the spring seat 243 embedded here is tightly connected to the lower end 223 of the regulating valve stem 22 through flexible deformation. In addition, the lower end of the regulating valve stem 22 can also be fixedly connected to the diaphragm assembly 24 by interference fit with the spring seat 243. The spring 244 is sleeved on the protrusion of the sealing portion 214, with one end abutted against the spring seat 243 and the other end abutted against the sealing portion 214. The spring seat 243 and at least part of the spring 244 are located in the second recess 211.

[0027] The following briefly introduces the second embodiment of the proportional regulation device of the gas proportional valve provided by the present invention. The difference from the first embodiment lies in the structures of the static iron core and the moving iron core. In this embodiment, the moving iron core 23 includes a third recess and a second through hole 231. The static iron core 21 is generally in a positive convex shape, including a first protrusion, a first through hole 212, and a second recess, and the first protrusion is adapted to the third recess.

[0028] The following briefly introduces the third embodiment of the proportional regulation device of the gas proportional valve provided by the present invention. In this embodiment, neither the moving iron core nor the static iron core has protrusions or recesses, and the overall structure is roughly cylindrical with both the upper and lower walls being planar. The static iron core includes a first through hole 212, a flat top wall, and a second recess 213. The moving iron core includes a second through hole control and a flat bottom wall, and the flat top wall abuts against the flat bottom wall.

[0029] The proportionality adjusting device 20 further includes a magnetic conduction component 50. The magnetic conduction component 50 includes a first magnetic conduction part 52 and a second magnetic conduction part 51. The second magnetic conduction part 51 is sleeved on the outer peripheral part of the static iron core 21 and abuts against it. The first magnetic conduction part 52 is sleeved on the outer peripheral part of the sleeve 28 and abuts against it. The first magnetic conduction part is close to the upper part of the housing part. The second magnetic conduction part 51 includes a second straight section and a second flanging section. The first magnetic conduction part 52 includes a first straight section and a first flanging section. The second straight section abuts against the outer peripheral part of the static iron core 21. The second flanging section abuts against the lower end skeleton of the coil component and the bottom wall of the housing part 29 respectively. The first straight section abuts against the outer peripheral part of the sleeve 28. And the moving iron core 23 abuts against at least a part of the first straight section through the sleeve 28. The first flanging section abuts against the upper end skeleton of the coil component and the top wall of the housing part 29 respectively. By energizing the proportionality adjusting device, under the excitation effect, the magnetic force generated by the coil component is transmitted to the entire housing part 29. The lower end 214 of the static iron core 21 is fixedly connected to the housing part 29, that is, the static iron core and the housing part have a certain magnetic conduction area, and the magnetic force can be transmitted to the static iron core. By providing the second magnetic conduction part 51, increasing the matching area with the static iron core 21 can further enhance the magnetic force. Another part of the magnetic force is transmitted to the first magnetic conduction part 52 through the upper housing of the housing part 29. The magnetic force can be transmitted to the moving iron core 23 through the area where the first straight section abuts against 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. By providing the magnetic conduction component, the magnetic conduction performance during the overall actuation of the proportionality adjusting device is enhanced.

[0030] The actuation principle of realizing the high-pressure or low-pressure outlet pressure regulation mode of the gas proportional valve is introduced in detail below. Gas enters from the inlet 1a of the gas proportional valve. The first core assembly 14 opens the first valve port 101, and the second core assembly 15 opens the second valve port 102. The gas enters the main flow channel 1c through the first valve port 101 and the second valve port 102. When it is necessary to realize the high-pressure outlet pressure regulation mode of the gas proportional valve, the coil component of the proportional regulation device can be energized. Under the excitation effect, the regulating valve rod 22 drives the moving iron core 23 to move downward together and approach the static iron core 21. The convex portion 232 gradually extends into the first concave portion 211 until it abuts against it. The regulating valve rod 22 exerts a force on the spring 244. The spring 244 is compressed and acts on the diaphragm assembly 24. The sealing portion 214 relatively approaches the valve port 103 and forms a first distance L1 with the valve port 103. The opening degree of the valve port 103 decreases accordingly, the pressure in the flow channel 151 gradually increases, and 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 rod to make the main valve sealing portion 35 open the main valve port 32. The opening degree of the main valve port 32 gradually increases, the gas flow rate flowing from the main valve port 32 to the outlet 1b increases, and finally the gas flow rate flowing to the external combustion chamber increases, realizing the higher outlet pressure regulation mode of the gas proportional valve. On the contrary, when it is necessary to realize the low-pressure outlet pressure regulation mode of the gas proportional valve, the proportional regulation device can be powered off. The electromagnetic effect disappears, the magnetic force disappears, the regulating valve rod 22 drives the moving iron core 23 to move upward together and gradually move away from the static iron core 21. The convex portion 232 gradually moves away from the first concave portion 211 until the upper end portion 222 of the regulating valve rod 22 abuts against the top wall of the housing member 29. By abutting against the top wall of the housing member 29 with the upper end portion 222, the upward movement of the moving iron core 23 is prevented, that is, it has a limiting effect on the upward actuation of the moving iron core 23. At this time, the force received by the spring 244 is relatively weakened, the sealing portion 241 of the diaphragm assembly 24 relatively moves away from the valve port 103 and forms a second distance L2 with it. The opening degree of the valve port 103 increases accordingly, a part of the pressure in the flow channel 151 flows out from the pressure relief flow channel 17, 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 main valve sealing portion 35 gradually approaches the main valve port 32, 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 lower outlet pressure regulation mode of the gas proportional valve. The flow channel 151 provided in the gas proportional valve 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 with each other. The gas enters the flow channel 151 through the first valve port 101 and the second valve port 102. By increasing or decreasing the opening degree of the valve port 103, the change of the pressure in the flow channel 151 can be directly affected, and further the change of the pressure in the back pressure chamber of the differential pressure regulating device 30 can be affected.Ultimately affecting the opening degree of the main valve port, the first flow channel 151a is relatively close to the safety control device 10 and one end thereof is communicated with the second valve port 102. One end of the second flow channel 151b is communicated with the valve port. The third flow channel 151c is relatively close to the differential pressure regulating device 30 and one end thereof is communicated with 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 communicated. By optimizing the structure of the proportional regulating device in the gas proportional valve provided by the present invention, after the gas enters through the first valve port 101 and the second valve port 102, the distance between the diaphragm assembly and the valve port can be controlled by making the proportional regulating device in a power-off or powered-on state, thereby affecting the valve port opening degree, and further realizing the regulation of the high-pressure or low-pressure outlet pressure of the gas proportional valve, so that the high-pressure or low-pressure outlet pressure can be regulated on the basis of the relatively simple overall structure of the gas proportional valve.

[0031] In addition, when a DC constant current power supply is connected to the proportional regulating device of the gas proportional valve, the outlet pressure of the valve body at the outlet 1b can be adjusted proportionally linearly. The primary pressure 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 regulating device is in a proportional relationship with 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 degree of the main valve port 32, and the larger the current, the larger the opening degree of the main valve port 32. By controlling the input current of the proportional regulating device linearly, the proportional linear regulation of the outlet pressure of the gas proportional valve can be realized.

[0032] It should be noted that the key point of the gas proportional valve provided by the present invention is to protect the structure of the proportional regulating device, and the structure and actual application of the safety driving device can be flexibly set according to actual market needs.

[0033] It should be noted that the ordinal numbers such as "first" and "second" and the orientation words such as "upper" and "lower" mentioned in the present invention are all described based on the accompanying drawings of 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 modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A gas proportional valve, characterized in that, It includes a valve port and a proportional regulating device. The proportional regulating device includes a static iron core, a moving iron core, a regulating valve rod and a diaphragm assembly. The moving iron core is located above the static iron core. The moving iron core is fixedly connected to the regulating valve rod or is an integral structure. The lower end of the regulating valve rod is fixedly connected or limitedly connected to the diaphragm assembly. The moving iron core can drive the regulating valve rod to approach or move away from the static iron core. The proportional regulating device further includes a coil component. When the coil component is energized, the moving iron core drives the regulating valve rod to move downward to approach the static iron core, and the diaphragm assembly relatively approaches the valve port and forms a first distance from the valve port. When the coil is de-energized, the moving iron core drives the regulating valve rod to move upward to move away from the static iron core, and the diaphragm assembly relatively moves away from the valve port and forms a second distance from the valve port. The second distance is greater than the first distance.

2. The gas proportional valve according to claim 1, wherein The proportional regulating device includes a housing member. The regulating valve rod includes an upper end portion, and the upper end portion can approach or move away from the top wall of the housing member. When the coil component is de-energized, the moving iron core can drive the regulating valve rod to move upward, and the upper end portion can abut against the top wall of the housing member to limit the upward actuation of the moving iron core.

3. The gas proportional valve according to claim 2, characterized in that, The static iron core includes a first recessed portion, a first through hole and a second recessed portion. The first through hole communicates with the first recessed portion and the second recessed portion. The moving iron core includes a second through hole and a protruding portion. The first recessed portion is adapted to the protruding portion. The first through hole and the second through hole are communicated and coaxially arranged. At least a part of the body portion of the regulating valve rod is located in the first through hole and the second through hole, and the lower end portion of the regulating valve rod extends into the inner cavity of the second recessed portion.

4. The gas ratio valve according to claim 2, characterized in that, The moving iron core includes a third recessed portion and a second through hole. The static iron core includes a first protruding portion, a first through hole and a second recessed portion. The first protruding portion is adapted to the third recessed portion.

5. The gas ratio valve according to claim 2, characterized in that, The static iron core includes a first through hole, a flat top wall and a second recessed portion. The moving iron core includes a second through hole and a flat bottom wall. The flat top wall can abut against the flat bottom wall.

6. The gas proportional valve according to any one of claims 1-5, characterized in that, The diaphragm assembly includes a diaphragm, a sealing portion, a spring seat and a spring member. The lower end portion of the regulating valve rod is embedded in the spring seat. The spring member is sleeved on the outer peripheral portion of the spring seat. One end of the spring member abuts against the spring seat and the other end abuts against the sealing portion.

7. The gas proportional valve according to any one of claims 1-5, characterized in that, The gas proportional valve further includes a safety control device and a differential pressure regulating device. The gas proportional valve includes a body and a first valve port and a second valve port located on the body, and further includes a flow channel. The flow channel includes a first flow channel, a second flow channel and a third flow channel. The first flow channel 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 valve port. The third flow channel is close to the differential pressure regulating device and one end of the third flow channel communicates with the back pressure chamber of the differential pressure regulating device. The first flow channel, the second flow channel and the third flow channel communicate with each other.

8. The gas proportional valve according to any one of claims 1-5, characterized in that, The proportional adjustment device further includes a sleeve, the sleeve is fixedly connected or limitedly connected to the upper end of the static iron core, the coil component is located on the outer peripheral part of the sleeve, the proportional adjustment device includes a receiving cavity, the sleeve and the static iron core roughly define the receiving cavity, and the moving iron core can perform axial lifting movement along the sleeve wall of the sleeve.

9. The gas proportional valve according to claim 1, wherein The proportional adjustment device further includes a first magnetic conduction part, a sleeve and a housing part. The first magnetic conduction part is sleeved on the outer peripheral part of the sleeve and the first magnetic conduction part is close to the upper part of the housing part. The first magnetic conduction part includes a first straight section and a first flanging section. The moving iron core can abut against at least part of the first straight section through the sleeve, and the first flanging section abuts against the upper end skeleton of the coil component and the top wall of the housing part respectively.

10. The gas proportional valve according to claim 9, characterized in that, The proportional adjustment device further includes a second magnetic conduction part. The second magnetic conduction part is sleeved on the outer peripheral part of the static iron core and the second magnetic conduction part is close to the lower part of the housing part. The second magnetic conduction part includes a second straight section and a second flanging section. The second straight section abuts against the outer peripheral wall of the static iron core, and the second flanging section abuts against the lower end skeleton of the coil component and the bottom wall of the housing part respectively.

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