Double spool gas solenoid valve with pressure relief valve

Abstract

The utility model provides a kind of double valve plug gas solenoid valve with pressure relief valve, the solenoid valve's electromagnetic coil group energization can make one fixed core produce magnetic force, and two-stage drive first, second movable core and main, auxiliary valve plug open valve. Among them, a pressure relief valve group is equipped between the first movable core and the second movable core, the pressure relief valve group is communicated between the air inlet chamber of air inlet end and the valve port portion of air outlet end, when electromagnetic coil group is magnetized, first drive second movable core to move and make pressure relief valve group open, let the gas in air inlet chamber from valve port portion small flow release, by this can open main valve plug after relieving the static pressure of gas in air inlet chamber, overcome the problem that known double valve plug solenoid valve must use larger power drive because of static pressure and cause main valve plug to open difficult, achieve the effect of power saving and prevent valve plug stick and open valve abnormal.

Description

Technical Field

[0001] This utility model relates to a dual-valve plug gas solenoid valve with a pressure relief valve. The technical content involves a dual-valve plug with double-sealed valve ports and a pressure relief valve assembly. Before the main valve plug opens, the pressure relief valve assembly can release a small flow of gas to relieve the static pressure of the gas in the intake chamber on the main valve plug, thus overcoming the problem that known dual-valve plug solenoid valves must use a large power to drive the valve opening. Background Technology

[0002] As is well known, solenoid valves used in gas appliances or pipelines open the valve port by using a solenoid coil to generate magnetic force when energized, which drives the movable iron core and valve plug to move, allowing gas to flow through the valve port. When the solenoid coil is de-energized and no magnetic force is generated, the valve plug can be closed by the elastic force of a spring, thereby blocking the flow of gas.

[0003] Among the relevant known technologies, such as CN114278736A and Taiwan Patent TWM609514, a solenoid valve using a dual-sealing system with main and auxiliary valve plugs is disclosed. This dual-sealing function ensures that even if one of the two valve plugs fails and cannot seal the valve, the other valve plug can still tightly seal the valve port. However, after extensive research, the designer of this case discovered that although these known dual-valve-plug solenoid valves improve safety compared to single-valve-plug valves, various design flaws mean that even with dual-valve-plug sealing, gas leakage cannot be completely prevented.

[0004] The designer of this case previously invented CN 118669545 A and Taiwan patent TWI 880809 dual-valve plug gas solenoid valve to address the problem of insufficient sealing of dual-valve plugs. The solenoid valve includes an electromagnetic coil assembly, a fixed iron core, a first movable iron core, a second movable iron core, a main valve plug, a secondary valve plug, and a valve port. When the electromagnetic coil assembly is energized, it can generate magnetic force in the fixed iron core, driving the first and second movable iron cores to move toward the fixed iron core, and respectively driving the main valve plug and the secondary valve plug away from the valve port to open the valve.

[0005] The main and auxiliary valve plugs are designed to double-close the valve port by slight swaying. Even if the valve plug and valve port are misaligned due to machining tolerances or other reasons, the valve can still be double-sealed to ensure that the gas does not leak.

[0006] After the inventor of the above invention implemented it, it did achieve the expected effect. However, because the sealing effect of the double valve plug is excellent, the static pressure generated by the gas in the intake chamber on the main valve plug is large. This may cause the main valve plug to stick when it is not used for a long time, resulting in abnormal valve opening. In order to ensure that there is no difficulty or abnormality in opening the valve, the circuit design must use a large power to drive the double valve plug to open. Utility Model Content

[0007] To overcome the aforementioned static pressure problem, the purpose of this utility model is to provide a dual-valve plug gas solenoid valve with a pressure relief valve. The main feature is that a pressure relief valve assembly is set between the first movable iron core and the second movable iron core. Before the main valve plug opens, the pressure relief valve assembly can release a small flow of gas to relieve the static pressure of the gas in the intake chamber on the main valve plug. This overcomes the problem that known dual-valve plug solenoid valves must use a large amount of power to drive the valve opening, achieving the effect of saving electricity and preventing valve plug sticking and abnormal valve opening.

[0008] To achieve the above objectives, this utility model provides a dual-valve plug gas solenoid valve with a pressure relief valve. The solenoid valve includes an electromagnetic coil assembly, a fixed iron core, a first movable iron core, a second movable iron core, a main valve plug, a secondary valve plug, and a valve port. The main valve plug and the secondary valve plug are located within an intake chamber, sealing the valve port. When the electromagnetic coil assembly is energized, the fixed iron core generates a magnetic force, which, through the first movable iron core, magnetically attracts the second movable iron core and the secondary valve plug away from the valve port. This causes the first movable iron core to displace and drive the main valve plug to open the valve port, allowing the gas in the intake chamber to be released through the valve port. Its key feature is:

[0009] A pressure relief valve assembly is provided between the first movable iron core and the second movable iron core. The pressure relief valve assembly is connected between the air intake chamber and the valve port. When the second movable iron core and the auxiliary valve plug move away from the valve port, the pressure relief valve assembly is driven to open, allowing the gas in the air intake chamber to pass through the pressure relief valve assembly and be released from the valve port in a small flow rate. This relieves the static pressure of the gas in the air intake chamber on the main valve plug, thereby enabling the main valve plug to open with relatively low power.

[0010] The following further explains the implementation methods of each component:

[0011] In practice, the pressure relief valve assembly includes:

[0012] A first through hole and a first central hole are provided on the first movable iron core, wherein the first central hole is axially disposed inside the first movable iron core, and the first through hole connects the air intake chamber and the first central hole;

[0013] A second through hole and a second central hole are provided on the second movable iron core, wherein the second central hole is axially disposed inside the second movable iron core and communicates with the first central hole, and the second through hole is disposed outside the second movable iron core and communicates between the second central hole and the valve port.

[0014] A pressure relief valve plug is inserted into the first central hole, and a pressure relief valve hole is axially inserted through the center of the pressure relief valve plug, connecting the first through hole and the second central hole;

[0015] A pressure relief valve stem is movable within the second central hole. The top end of the pressure relief valve stem passes through the pressure relief valve hole and is fitted with a cap. The bottom end of the pressure relief valve stem is abutted by a small spring, causing the cap to elastically close the pressure relief valve hole.

[0016] When the second movable iron core is driven to move toward the first movable iron core, it can simultaneously push the pressure relief valve rod and the cover to open the pressure relief valve hole, so that the gas in the intake chamber is released to the valve port through the first through hole, the pressure relief valve hole, the second middle hole and the second through hole in sequence, thereby relieving the static pressure.

[0017] In implementation, the first movable iron core is movably sleeved within a first sleeve. The top of the first sleeve is fixed to the inner edge of the electromagnetic coil assembly or to the fixed iron core. The bottom of the first sleeve connects to the air intake chamber, and a first pressure relief channel is provided between the inner edge of the first sleeve and the outer edge of the first movable iron core. This first pressure relief channel connects the first through hole and the air intake chamber.

[0018] The second movable iron core is movably sleeved inside a second sleeve. The top of the second sleeve is fixed to the bottom of the first movable iron core. A second pressure relief channel is provided between the inner edge of the second sleeve and the outer edge of the second movable iron core. The second pressure relief channel is connected between the second through hole and the valve port. When the pressure relief valve assembly is opened, the gas in the intake chamber passes through the first pressure relief channel, the pressure relief valve assembly, and the second pressure relief channel in sequence and is then released from the valve port.

[0019] In practice, the first pressure relief channel is formed by axial cutting of the outer edge of the first movable iron core, and the second pressure relief channel is formed by axial cutting of the outer edge of the second movable iron core.

[0020] During implementation, a screw hole is drilled from the bottom to the top of the second movable iron core, and a screw is installed on the top of the auxiliary valve plug. The top of the screw is screwed into the screw hole in an adjustable height so that the auxiliary valve plug can abut against and close the valve port.

[0021] During implementation, the main valve plug is installed at the bottom of the second sleeve. After the pressure relief valve group and the auxiliary valve plug are opened, the magnetic force generated by the electromagnetic coil on the fixed iron core can drive the first movable iron core to move. At the same time, the main valve plug is moved away from the valve port through the second sleeve, so that the gas in the intake chamber is released from the valve port in a large flow rate through the main valve plug and the auxiliary valve plug in the open state.

[0022] During implementation, the bottom of the second sleeve is bent inward to form an inner buckling ring, and a protruding post protrudes upward from the center of the top of the main valve plug. The outer edge of the protruding post is provided with a ring groove for the inner buckling ring to hold.

[0023] In practice, the valve port includes a main valve hole, and a concave annular groove is provided around the main valve hole at intervals, so that an annular pressing part is formed between the main valve hole and the concave annular groove. The pressing part can be pressed against the bottom of the auxiliary valve plug, thereby sealing the main valve hole. The bottom of the main valve plug is pressed against the outer periphery of the auxiliary valve plug and the concave annular groove, so that the outer periphery of the main valve hole is doubly sealed by the auxiliary valve plug and the main valve plug.

[0024] In practice, the pressure relief valve plug is made of flexible rubber or rigid metal / plastic parts, and the cover is made of corresponding rigid metal / plastic parts or flexible rubber; wherein when the pressure relief valve plug is made of rigid metal / plastic parts, a rubber leak-proof ring is provided between its outer edge and the inner edge of the first central hole.

[0025] In practice, the bottom of the fixed iron core is a downward-protruding annular or inverted conical shape, and the top of the first movable iron core is a corresponding annular or conical groove.

[0026] Compared to previous technologies, the pressure relief valve assembly in this invention can introduce a small flow of gas from the intake chamber before the main valve plug opens, and then release it from the valve port. This effectively relieves the static pressure on the main valve plug in the intake chamber, overcomes the problem that the dual-valve plug solenoid valve must use a large amount of power to drive the valve opening, achieves the effect of saving electricity, and can prevent the main valve plug from sticking and causing abnormal valve opening.

[0027] The following describes embodiments suitable for this utility model, based on the technical means of this utility model, and in conjunction with the accompanying drawings. Attached Figure Description

[0028] Figure 1 This is an exploded perspective view of the present invention.

[0029] Figure 2 This is a cross-sectional view of the present invention before the valve is opened.

[0030] Figure 3 This is an enlarged view of the structure of the pressure relief valve assembly of this utility model.

[0031] Figure 4 This is a schematic diagram of the first section opening auxiliary valve plug of this utility model.

[0032] Figure 5 This is a schematic diagram illustrating the opening action of the pressure relief valve assembly of this utility model.

[0033] Figure 6 This is a schematic diagram of the action of opening the main valve plug in the second stage of this utility model.

[0034] Figure 7 This is a schematic diagram of another embodiment of the present invention.

[0035] Explanation of reference numerals in the attached drawings: Electromagnetic coil assembly 100; Fixed iron core 101; Air inlet chamber 102; First movable iron core 10; Second movable iron core 20; Screw hole 21; Main valve plug 30; Main spring 31; Protrusion 32; Annular groove 33; Secondary valve plug 40; Secondary spring 41; Screw 42; Valve port 50; Main valve hole 51; Concave annular groove 52; Annular pressing part 53; Pressure relief valve assembly 60; First through hole 61; First central hole 62; Second through hole 63; Second central hole 64; Pressure relief valve plug 65; Pressure relief valve stem 66; Cover 661; Small spring 662; Rubber leak-proof ring 663; First pressure relief channel 67; Second pressure relief channel 68; Pressure relief valve hole 69; First sleeve 70; Second sleeve 80; Inner retaining ring 81. Detailed Implementation

[0036] like Figures 1 to 3 As shown, this utility model provides a dual-valve plug gas solenoid valve with a pressure relief valve, comprising an electromagnetic coil assembly 100, with a fixed iron core 101 surrounding the electromagnetic coil assembly 100, and a first movable iron core 10, a second movable iron core 20, a main valve plug 30, a secondary valve plug 40, a valve port 50, and a pressure relief valve assembly 60 arranged sequentially below the fixed iron core 101.

[0037] The main valve plug 30, the auxiliary valve plug 40, and the valve port 50 are located within the air intake chamber 102 of the valve body. A movable gap exists between the fixed iron core 101, the first movable iron core 10, and the second movable iron core 20. The pressure relief valve assembly 60 is positioned between the first movable iron core 10 and the second movable iron core 20. Furthermore, the bottom of the first movable iron core 10 is connected to the main valve plug 30, and the bottom of the second movable iron core 20 is connected to the auxiliary valve plug 40. In the non-use state, the main valve plug 30 and the auxiliary valve plug 40 double-close the valve port 50, blocking the gas flow and preventing it from being released from the air intake chamber 102 through the valve port 50.

[0038] In practice, the valve port 50 includes a main valve hole 51, and a concave annular groove 52 is provided around the main valve hole 51 at intervals, so that an annular pressing part 53 is formed between the main valve hole 51 and the concave annular groove 52. The pressing part 53 can be pressed against the bottom of the auxiliary valve plug 40, thereby sealing the main valve hole 51. The bottom of the main valve plug 30 is pressed against the outer periphery of the concave annular groove 52 of the auxiliary valve plug 40 and the valve port 50, so that the outer periphery of the main valve hole 51 is doubly sealed by the auxiliary valve plug 40 and the main valve plug 30.

[0039] like Figures 4 to 6As shown, when the valve is opened, the electromagnetic coil assembly 100 generates a magnetic force on the fixed iron core 101 after being energized. This first generates a magnetic force on the second movable iron core 20 through the first movable iron core 10, causing the second movable iron core 20 to be magnetically attracted and displaced towards the first movable iron core 10. At the same time, it drives the auxiliary valve plug 40 away from the valve port 50 and opens the pressure relief valve assembly 60. At this time, the main valve plug 30 remains in a closed state. Then, under the continuous energization of the electromagnetic coil assembly 100 and the magnetic force generated on the fixed iron core 101, the first movable iron core 10 is magnetically attracted and drives the main valve plug 30 away from the valve port 50, thus completing the valve opening. The opening and function of the pressure relief valve assembly 60 will be described later.

[0040] In the two-stage valve opening process described above, regarding the order in which the first movable iron core 10, the main valve plug 30, the second movable iron core 20, and the auxiliary valve plug 40 are magnetically displaced, it is only necessary to set a main spring 31 to elastically press against the main valve plug 30, and a secondary spring 41 to elastically press against the auxiliary valve plug 40. The elastic force of the main spring 31 is greater than that of the secondary spring 41. When the fixed iron core 101 generates magnetic force, because the main spring 31 elastically presses against the first movable iron core 10 and the main valve plug 30, the relatively weaker elastic secondary spring 41 is first overcome by the magnetic attraction force, allowing the second movable iron core 20 to move and open the auxiliary valve plug 40. Then, under the continuous action of the electromagnetic coil group 100 and the fixed iron core 101, the magnetic attraction force overcomes the elastic force of the main spring 31, allowing the first movable iron core 10 and the main valve plug 30 to move away from the valve port 50, thus completing the two-stage valve opening.

[0041] In a feasible implementation, the magnetic attraction between the bottom end of the fixed iron core 101 and the top end of the first movable iron core 10 can be achieved by providing a downwardly protruding annular shape at the bottom of the fixed iron core 101, and the top end of the first movable iron core 10 having a correspondingly shaped annular groove, or as... Figure 7 The bottom of the fixed iron core 101 is an inverted cone shape that protrudes downwards, while the top of the first movable iron core 10 is a cone-shaped groove of the corresponding shape.

[0042] By using the concave-convex combination of the bottom of the fixed iron core 101 and the top of the first movable iron core 10, the magnetic flux between the fixed iron core 101 and the first movable iron core 10 can be increased, making it easier for the magnetic attraction to first attract the second movable iron core 20 to open the secondary valve plug 40, and then make the first movable iron core 10 and the main valve plug 30 open the valve, thus completing the two-stage valve opening.

[0043] It should be noted that when the first active iron core 10 is implemented, if Figure 1 , Figure 2 As shown, the first movable iron core 10 is movably sleeved in a first sleeve 70. The top of the first sleeve 70 is fixed to the inner edge of the electromagnetic coil group 100 or to the iron core 101, while the bottom is connected to the air inlet chamber 102, so that the first movable iron core 10 can move up and down within the first sleeve 70.

[0044] As shown in the figure, the second movable iron core 20 is movably sleeved inside a second sleeve 80 during implementation. The top of the second sleeve 80 is fixed to the bottom of the first movable iron core 10, so that the second sleeve 80 can move up and down with the first movable iron core 10. The bottom of the second sleeve 80 is bent inward to form an inner buckling ring 81. A protruding post 32 protrudes upward from the center of the top of the main valve plug 30. The outer edge of the protruding post 32 is provided with an annular groove 33 for the inner buckling ring 81 to hold. When the second sleeve 80 and the first movable iron core 10 move upward synchronously, the inner buckling ring 81 engages with the protruding post 32 and the annular groove 33 of the main valve plug 30, so that the main valve plug 30 can move up and down with the first movable iron core 10 and close to the valve port 50 to seal the valve, or close to the valve port 50 to open the valve.

[0045] In practice, the second movable iron core 20 is drilled with a screw hole 21 from the bottom upwards, and a screw 42 is provided on the top of the auxiliary valve plug 40. The top of the screw 42 is screwed into the screw hole 21 in an adjustable height, so that the auxiliary valve plug 40 can accurately abut against and close the valve port 50.

[0046] like Figures 2 to 5 As shown, the pressure relief valve assembly 60 disposed between the first movable iron core 10 and the second movable iron core 20 in the aforementioned utility model has the following main function: when the electromagnetic coil assembly 100 is displaced by the magnetic attraction of the second movable iron core 20 through the fixed iron core 101 and the first section of the first movable iron core 10, the auxiliary valve plug 40 and the pressure relief valve assembly 60 can be opened simultaneously, allowing a small flow of gas in the intake chamber 102 to be released from the valve port 50 after passing through the pressure relief valve assembly 60, thereby relieving the static pressure of the gas in the intake chamber 102 on the main valve plug 30. This not only reduces the power required to drive the main valve plug 30, but also prevents the main valve plug 30 from sticking to the valve port 50 due to static pressure caused by long-term disuse, which would lead to abnormal valve opening.

[0047] The following details the location and operating principle of the pressure relief valve assembly 60:

[0048] As shown in the figure, the pressure relief valve assembly 60 includes: a first through hole 61 and a first intermediate hole 62 disposed on the first movable iron core 10, a second through hole 63 and a second intermediate hole 64 disposed on the second movable iron core 20, a pressure relief valve plug 65 covering the first intermediate hole 62, and a pressure relief valve stem 66 movably disposed in the second intermediate hole 64.

[0049] The first central hole 62 is axially disposed inside the first movable iron core 10. The first through hole 61 connects the air intake chamber 102 outside the first movable iron core 10 with the first central hole 62. The first movable iron core 10 is movably sleeved inside the first sleeve 70 as described above. The bottom of the first sleeve 70 is connected to the air intake chamber 102. Therefore, it is only necessary to cut a recess axially on the outer edge of the first movable iron core 10 to create a gap between the first movable iron core 10 and the first sleeve 70, thereby forming a first pressure relief channel 67 connecting the air intake chamber 102 and the first through hole 61.

[0050] The second central hole 64 is axially disposed inside the second movable iron core 20 and communicates with the first central hole 62. The second through hole 63 is disposed outside the second movable iron core 20 and communicates between the second central hole 64 and the valve port 50. Similarly, as mentioned above, the second movable iron core 20 can be movably fitted inside the second sleeve 80. Therefore, by simply cutting a recess axially on the outer edge of the second movable iron core 20 to create a gap between the second movable iron core 20 and the second sleeve 80, a second pressure relief channel 68 communicating between the second through hole 63 and the valve port 50 can be formed.

[0051] The pressure relief valve plug 65, which is sealed inside the first central hole 62, can block the communication between the first through hole 61 and the second central hole 64. The pressure relief valve plug 65 is axially inserted through a pressure relief valve hole 69 at its center position, which connects the first through hole 61 and the second central hole 64. The top end of the pressure relief valve rod 66 passes through the pressure relief valve hole 69 and is provided with a cover 661. The bottom end of the pressure relief valve rod 66 is supported by a small spring 662, so that the cover 661 elastically seals the pressure relief valve hole 69.

[0052] like Figure 2 and Figure 7 As shown, in practice, the sealing structure between the pressure relief valve plug 65 and the cover 661 only requires that the two be corresponding flexible rubber and rigid metal / plastic components abutting against each other to tightly seal the pressure relief valve hole 69. For example, when the pressure relief valve plug 65 is flexible rubber, the cover 661 is made of rigid metal / plastic, or when the pressure relief valve plug 65 is rigid metal / plastic, the cover 661 is a corresponding rigid metal / plastic component. When the pressure relief valve plug 65 is rigid metal / plastic, a rubber leak-proof ring 663 can be provided between its outer edge and the inner edge of the first central hole 62 to ensure that the gas can only pass through the pressure relief valve hole 69.

[0053] Therefore, when the electromagnetic coil assembly 100 is energized, as Figure 4 , Figure 5When the second movable iron core 20 is driven to move toward the first movable iron core 10, in addition to causing the auxiliary valve plug 40 to move away from the valve port 50 to open the valve, the second movable iron core 20 can simultaneously push the pressure relief valve rod 66 and the cover 661 to move, and open the pressure relief valve hole 69 on the pressure relief valve plug 65. This allows the small flow of gas in the intake chamber 102 to enter from the bottom of the first sleeve 70, and then pass through the first pressure relief channel 67, the first through hole 61, the pressure relief valve hole 69, the second middle hole 64, the second through hole 63, and the second pressure relief channel 68 in sequence before being released to the valve port 50, thereby relieving the static pressure of the gas in the intake chamber 102 on the main valve plug 30.

[0054] At this time, the electromagnetic coil assembly 100 continuously applies the magnetic attraction force generated by the fixed iron core 101, which can then... Figure 6 As shown, the first movable iron core 10 is easily moved by the magnetic attraction of the fixed iron core 101, and the second sleeve 80 drives the main valve plug 30 away from the valve port 50 to complete the valve opening. The gas in the air intake chamber 102 is released from the valve port 50 in a large flow rate through the main valve plug 30 and the auxiliary valve plug 40 in the valve opening state, thus completing the valve opening.

[0055] In summary, this utility model, through the pressure relief valve assembly 60 set between the first movable iron core 10 and the second movable iron core 20, first opens the pressure relief valve assembly 60 to release the static pressure in the air intake chamber 102 before driving the main valve plug 30 to open. This not only effectively saves the output power and electrical energy required to drive the main valve plug 30 to open, but also prevents the main valve plug 30 from sticking due to long-term disuse, which could lead to abnormal valve opening.

[0056] The above figures and descriptions are only used to illustrate the preferred embodiments of this utility model and are not intended to limit the patent scope of this utility model. Any examples that are similar or identical to the purpose and structural features of this utility model should fall within the patent scope of this utility model. This is hereby declared.

Claims

1. A dual-valve plug gas solenoid valve with a pressure relief valve, the solenoid valve comprising an electromagnetic coil assembly, a fixed iron core, a first movable iron core, a second movable iron core, a main valve plug, a secondary valve plug, and a valve port, wherein the main valve plug and the secondary valve plug are located within an intake chamber to close the valve port; energizing the electromagnetic coil assembly enables the fixed iron core to generate magnetic force, which, through the first movable iron core, magnetically attracts the second movable iron core and the secondary valve plug away from the valve port, thereby displacing the first movable iron core and driving the main valve plug to open the valve port, allowing the gas in the intake chamber to be released through the valve port; characterized in that: A pressure relief valve assembly is provided between the first movable iron core and the second movable iron core. The pressure relief valve assembly is connected between the air intake chamber and the valve port. When the second movable iron core and the auxiliary valve plug move away from the valve port, the pressure relief valve assembly is driven to open, allowing the gas in the air intake chamber to pass through the pressure relief valve assembly and be released from the valve port in a small flow rate. This relieves the static pressure of the gas in the air intake chamber on the main valve plug, thereby enabling the main valve plug to open with relatively low power.

2. The dual-valve plug gas solenoid valve with a pressure relief valve as described in claim 1, characterized in that, The pressure relief valve assembly includes: A first through hole and a first central hole are provided on the first movable iron core, wherein the first central hole is axially disposed inside the first movable iron core, and the first through hole connects the air intake chamber and the first central hole; A second through hole and a second intermediate hole are provided on the first movable iron core, wherein the second intermediate hole is axially disposed inside the second movable iron core and communicates with the first intermediate hole, and the second through hole is disposed outside the second movable iron core and communicates between the second intermediate hole and the valve port. A pressure relief valve plug is inserted into the first central hole, and a pressure relief valve hole is axially inserted through the center of the pressure relief valve plug, connecting the first through hole and the second central hole; A pressure relief valve stem is movable in the second central hole. The top end of the pressure relief valve stem passes through the pressure relief valve hole and is provided with a cover. The bottom end of the pressure relief valve stem is supported by a small spring, so that the cover elastically closes the pressure relief valve hole. When the second movable iron core is driven to move toward the first movable iron core, it can simultaneously push the pressure relief valve rod and the cover to open the pressure relief valve hole, so that the gas in the intake chamber is released to the valve port through the first through hole, the pressure relief valve hole, the second middle hole and the second through hole in sequence, thereby relieving the static pressure.

3. The dual-valve plug gas solenoid valve with a pressure relief valve as described in claim 2, characterized in that: The first movable iron core is movably sleeved in a first sleeve. The top of the first sleeve is fixed to the inner edge of the electromagnetic coil group or to the iron core. The bottom of the first sleeve is connected to the air inlet chamber. A first pressure relief channel is provided between the inner edge of the first sleeve and the outer edge of the first movable iron core. The first pressure relief channel is connected between the first through hole and the air inlet chamber. The second movable iron core is movably sleeved inside a second sleeve. The top of the second sleeve is fixed to the bottom of the first movable iron core. A second pressure relief channel is provided between the inner edge of the second sleeve and the outer edge of the second movable iron core. The second pressure relief channel is connected between the second through hole and the valve port. When the pressure relief valve assembly is opened, the gas in the intake chamber passes through the first pressure relief channel, the pressure relief valve assembly, and the second pressure relief channel in sequence and is then released from the valve port.

4. The dual-valve plug gas solenoid valve with a pressure relief valve as described in claim 3, characterized in that: The first pressure relief channel is formed by axial cutting of the outer edge of the first movable iron core, and the second pressure relief channel is formed by axial cutting of the outer edge of the second movable iron core.

5. The dual-valve plug gas solenoid valve with a pressure relief valve as described in claim 3, characterized in that: The second movable iron core has a screw hole drilled from the bottom upwards. A screw is installed on the top of the auxiliary valve plug. The top of the screw is screwed into the screw hole in an adjustable height so that the auxiliary valve plug can abut against and close the valve port.

6. The dual-valve plug gas solenoid valve with a pressure relief valve as described in claim 3, characterized in that: The second sleeve is equipped with the main valve plug at the bottom. After the pressure relief valve group and the auxiliary valve plug are opened, the magnetic force generated by the electromagnetic coil group on the fixed iron core can drive the first movable iron core to move. At the same time, the second sleeve drives the main valve plug away from the valve port, so that the gas in the intake chamber is released from the valve port in a large flow rate through the main valve plug and the auxiliary valve plug in the open state.

7. The dual-valve plug gas solenoid valve with a pressure relief valve as described in claim 6, characterized in that: The bottom of the second sleeve is bent inward to form an inner buckle ring, and a protruding post protrudes upward from the center of the top of the main valve plug. The outer edge of the protruding post is provided with a ring groove for the inner buckle ring to hold.

8. The dual-valve plug gas solenoid valve with a pressure relief valve as described in any one of claims 2 to 7, characterized in that: The valve port includes a main valve hole, and a concave annular groove is provided around the main valve hole at intervals, so that an annular pressing part is formed between the main valve hole and the concave annular groove. The pressing part can be pressed against the bottom of the auxiliary valve plug, thereby sealing the main valve hole. The bottom of the main valve plug is pressed against the outer periphery of the auxiliary valve plug and the concave annular groove, so that the outer periphery of the main valve hole is doubly sealed by the auxiliary valve plug and the main valve plug.

9. The dual-valve plug gas solenoid valve with a pressure relief valve as described in any one of claims 2 to 7, characterized in that: The pressure relief valve plug is made of flexible rubber or rigid metal / plastic parts, and the cover is made of corresponding rigid metal / plastic parts or flexible rubber; wherein when the pressure relief valve plug is made of rigid metal / plastic parts, a rubber leak-proof ring is provided between its outer edge and the inner edge of the first central hole.

10. The dual-valve plug gas solenoid valve with a pressure relief valve as described in any one of claims 2 to 7, characterized in that: The bottom of the fixed iron core is a downward-protruding annular or inverted conical shape, and the top of the first movable iron core is a correspondingly shaped annular or conical groove.

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