Gas valve and automatic control method thereof

Abstract

The invention belongs to the technical field of gas valves, and particularly relates to a gas valve and an automatic control method thereof.The gas valve comprises a valve body, a first valve element, a first valve rod and a self-closing mechanism, and the valve body comprises a gas inlet end and a gas outlet end; the first valve element is installed in the valve body, provided with a vent hole communicating with the air inlet end and the air outlet end and used for opening and closing the interior of the valve body. The first valve rod is installed in the valve body, one end of the first valve rod extends out of the valve body and is provided with a handle, and the other end of the first valve rod is clamped with the first valve element and used for driving the first valve element to rotate to achieve opening and closing in the valve body. The self-closing mechanism comprises a high-pressure self-closing assembly installed in the first valve element and a high-temperature self-closing assembly installed at the air inlet end. The self-closing mechanism is arranged in the gas valve, the gas valve has the high-pressure self-closing effect and the high-temperature self-closing effect, the situation that a self-closing valve is additionally arranged on a pipeline is avoided, the structure is simplified, the input cost is reduced, and the leakage risk is effectively reduced, the reliability is improved, and the safety performance is guaranteed by reducing connecting points of the valve and the pipeline.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas valves, and in particular relates to a gas valve and an automatic control method thereof. Background Art

[0002] The gas valve is used to cut off, connect and regulate the gas in the pipeline. It has good control characteristics and closing and sealing performance. It is suitable for various gas medium pipelines such as city gas, liquefied petroleum gas, natural gas, oxygen, etc., and is a key equipment to ensure the safety of gas use.

[0003] However, the traditional gas valve itself does not have the self-closing effect under high pressure and high temperature. Usually, a series self-closing valve is used to detect the pressure or temperature in the pipeline and close the pipeline in an abnormal situation. However, this method not only leads to a complex structure and increased cost investment, but also causes too many connection points between valves and pipelines in the pipeline, increasing the risk of leakage, low reliability, and safety hazards. Summary of the invention

[0004] The purpose of the present invention is to provide a gas valve and an automatic control method thereof in order to solve the above-mentioned technical problems, so as to achieve the effect of self-closing control of the gas valve when the pressure or temperature in the pipeline is abnormal.

[0005] In view of this, the present invention provides a gas valve, comprising:

[0006] A valve body, including an air inlet end and an air outlet end;

[0007] The first valve core is installed in the valve body and is provided with a vent hole connecting the air inlet end and the air outlet end, and is used for opening and closing the valve body;

[0008] The first valve stem is installed in the valve body, and one end of the stem extends out of the valve body and is provided with a handle, and the other end is engaged with the first valve core and is used to drive the first valve core to rotate to realize the opening and closing of the valve body;

[0009] The self-closing mechanism comprises a high-pressure self-closing component installed in the first valve core and a high-temperature self-closing component installed at the air inlet end.

[0010] In the above technical solution, further, the high-voltage self-closing component includes:

[0011] A first bracket is installed in the first valve core;

[0012] A second valve stem is slidably connected to the first bracket, and a second valve core is provided at one end close to the gas outlet end;

[0013] The first annular protrusion is installed on the inner wall of the vent hole and is used to cooperate with the second valve core to realize the opening and closing of the vent hole;

[0014] A first elastic member is mounted on the first bracket and is used to prevent the second valve core from approaching the first annular protrusion;

[0015] When the force brought by the high pressure is greater than the resisting force of the first elastic member, the second valve core approaches the first annular convex edge.

[0016] In the above technical solution, further, the high temperature self-closing component includes:

[0017] A second bracket is mounted on the inner wall of the air inlet end;

[0018] A third valve stem is installed in the air inlet end, and one end of the third valve stem passes through the second bracket and is provided with a block for limiting the movement of the third valve stem, and the other end of the third valve stem is provided with a third valve core;

[0019] The second annular convex edge is installed on the inner wall of the air inlet end and is used to cooperate with the third valve core to realize the opening and closing of the vent hole;

[0020] A second elastic member is mounted on the second bracket and is used to force the third valve core to approach the second annular convex edge;

[0021] The block will melt at high temperature and release the restriction on the third valve stem.

[0022] In the above technical solution, further, it also includes:

[0023] A connecting rod, one end of which is clamped with the first valve stem and the other end of which is connected with the handle;

[0024] A third elastic member is sleeved at the connection between the first valve stem and the connecting rod and is used to promote the connecting rod to move away from the first valve stem;

[0025] Among them, the valve body is provided with an L-shaped groove at the connection between the first valve stem and the connecting rod, and a protrusion slidably connected to the L-shaped groove is provided on the side of the connecting rod; and the connecting rod can be offset along the axial direction of the first valve stem, and when the connecting rod is offset, it is always clamped with the first valve stem.

[0026] In the above technical solution, further:

[0027] The valve body is provided with a first annular groove at the connecting rod, and a clamping spring is arranged in the first annular groove and is used to limit the protruding part in the L-shaped sliding groove.

[0028] In the above technical solution, further:

[0029] An insulating structure is provided on one side of the gas outlet end close to the valve body;

[0030] The gas outlet is fixedly connected to the insulating structure and is detachably connected to the valve body through the insulating structure.

[0031] In the above technical solution, further:

[0032] The insulating structure comprises a first connecting portion and a second connecting portion, and the air outlet end is sleeved on the first connecting portion;

[0033] Among them, a plurality of protrusions are arranged on the circumference of the surface of the first connecting portion, and a circular hole adapted to the plurality of protrusions is opened at the air inlet end.

[0034] In the above technical solution, further:

[0035] A valve seat is installed in the valve body and is located on both sides of the first valve core close to the air inlet end and the air outlet end;

[0036] The second connecting portion is provided with a second annular groove for mounting the valve seat, and annular reinforcing ribs are formed on both sides of the second annular groove in the radial direction.

[0037] In the above technical solution, further:

[0038] Sealing rings are arranged between the second connecting portion and the air inlet end, and between the first valve stem and the valve body.

[0039] The present invention provides a gas valve automatic control method, comprising the following steps:

[0040] S1: Install the gas valve in the gas pipeline and test its air tightness;

[0041] S2: Press the handle so that the protrusion enters the radial side from the axial side of the L-shaped slide groove, and then turn the handle to open the first valve core, the gas valve is turned on, and gas is supplied normally;

[0042] S3: When the gas pressure in the gas pipeline increases, the force brought by the gas pressure will prompt the second valve core to drive the second valve stem to offset the resistance force of the first elastic member, and push the second valve core to abut against the first annular convex edge, thereby blocking the transmission of the gas;

[0043] S4: When the gas pressure in the gas pipeline decreases, the force brought by the gas pressure is smaller than the resistance force of the first elastic member, and the second valve core is separated from the first annular convex edge under the action of the restoring force of the first elastic member, and the gas delivery is restored;

[0044] S5: When the temperature in the gas pipeline rises, the high temperature will cause the block to melt and release the restriction of the third valve stem. The third valve core will abut against the second annular convex edge under the action of the restoring force of the second elastic member to block the delivery of the gas.

[0045] The beneficial effects of the present invention are:

[0046] 1. By setting a self-closing mechanism in the gas valve and making it have the effects of high-pressure self-closing and high-temperature self-closing, it is avoided to add a self-closing valve on the pipeline, simplifying the structure and reducing the investment cost. In addition, by reducing the connection points between the valve and the pipeline, the risk of leakage is effectively reduced, the reliability is improved, and the safety performance is guaranteed;

[0047] 2. By adopting the setting of the first elastic member and making it resist the second valve core to approach the first annular convex edge, when the pressure in the pipeline is too high and when the force brought by the high pressure is greater than the resistance force of the first elastic member, the second valve core is pushed to approach the first annular convex edge to achieve a self-closing effect, and after the pipeline pressure is restored, it is reset under the action of the first elastic member and the gas valve is opened. The whole process is carried out automatically, effectively eliminating the impact of pressure fluctuations in the pipeline on gas safety;

[0048] 3. By placing the second elastic member in an energy storage state, when the block used to restrict the movement of the third valve stem melts due to high temperature, the restriction on the third valve stem will be released, thereby releasing the stored energy of the second elastic member, pushing the third valve core to seal with the second annular convex edge, and realizing self-closing, effectively ensuring gas safety, especially when there is an open flame at the gas outlet end, it can effectively prevent continuous leakage of gas and ensure safety;

[0049] 4. Through the arrangement of the L-shaped slide groove, the connecting rod and the protrusion on its side, after the handle drives the first valve core to be closed through the first valve stem, the protrusion can be pushed into the L-shaped slide groove under the action of the third elastic member, thereby limiting the radial circumferential rotation of the handle, preventing the first valve core from being opened due to accidental touching of the handle, and further improving the safety of the gas valve;

[0050] 5. By setting an insulating structure between the valve body and the gas outlet, the conduction of static electricity can be blocked, further improving the safety of the gas valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a schematic diagram of the structure of the present invention;

[0052] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0053] Figure 3 The present invention Figure 2 The enlarged view of point A in the middle;

[0054] Figure 4 The present invention Figure 2 The enlarged view of point B in the middle;

[0055] Figure 5 is an exploded view of the present invention;

[0056] The markings in the figure are as follows: 1. valve body; 2. air inlet end; 3. air outlet end; 4. first valve core; 5. air vent; 6. first valve stem; 7. handle; 8. high-pressure self-closing assembly; 80. first bracket; 81. second valve stem; 82. second valve core; 83. first annular ridge; 84. first elastic member; 9. high-temperature self-closing assembly; 90. second bracket; 91. third valve stem; 92. block; 93. third valve core; 94. second annular ridge; 95. second elastic member; 10. connecting rod; 11. third elastic member; 12. L-shaped slide groove; 13. protrusion; 14. first annular groove; 15. retaining spring; 16. insulating structure; 160. first connecting part; 161. second connecting part; 17. boss; 18. round hole; 19. valve seat; 20. second annular groove; 21. annular reinforcement rib; 22. sealing ring; 23. annular groove. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0058] Embodiment 1:

[0059] This embodiment provides a gas valve, including:

[0060] A valve body 1, comprising an air inlet end 2 and an air outlet end 3;

[0061] The first valve core 4 is installed in the valve body 1 and is provided with a vent hole 5 communicating with the air inlet end 2 and the air outlet end 3, and is used for opening and closing the valve body 1;

[0062] The first valve stem 6 is installed in the valve body 1, and one end of the first valve stem extends out of the valve body 1 and is provided with a handle 7, and the other end is engaged with the first valve core 4 and is used to drive the first valve core 4 to rotate to realize the opening and closing of the valve body 1;

[0063] The self-closing mechanism comprises a high-pressure self-closing component 8 installed in the first valve core 4 and a high-temperature self-closing component 9 installed at the air inlet end 2 .

[0064] It can be seen from this embodiment that by arranging a self-closing mechanism in the gas valve and making it have the effects of high-pressure self-closing and high-temperature self-closing, it is avoided to add a self-closing valve to the pipeline, simplifying the structure, and having the effect of reducing investment costs. In addition, by reducing the connection points between the valve and the pipeline, the risk of leakage is effectively reduced, reliability is improved, and safety performance is guaranteed.

[0065] Embodiment 2:

[0066] This embodiment provides a gas valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features. The high-pressure self-closing component 8 includes:

[0067] A first bracket 80 is installed in the first valve core 4;

[0068] The second valve stem 81 is slidably connected to the first bracket 80, and a second valve core 82 is provided at one end close to the gas outlet end 3;

[0069] The first annular protrusion 83 is installed on the inner wall of the vent hole 5 and is used to cooperate with the second valve core 82 to realize the opening and closing of the vent hole 5;

[0070] A first elastic member 84 is mounted on the first bracket 80 and is used to prevent the second valve core 82 from approaching the first annular protrusion 83;

[0071] When the force brought by the high pressure is greater than the resistance force of the first elastic member 84, the second valve core 82 moves closer to the first annular protrusion 83;

[0072] At the same time, the second valve stem 81 and the second valve core 82 may be of an integrated structure, and a rubber gasket is provided on one side of the second valve core 82 close to the first annular ridge 83, while the first annular ridge 83 and the first valve core 4 are of an integrated structure, and the first bracket 80 is fixed by a retaining spring 15;

[0073] The first elastic member 84 can be a spring and sleeved on the second valve stem 81. At the same time, a mounting cavity for mounting the first elastic member 84 is provided on the inner wall of the vent hole 5. A retaining spring 15 is sleeved on one end of the second valve stem 81 away from the second valve core 82 to abut against one end of the first elastic member 84.

[0074] An annular groove 23 connected to the air inlet end 2 is formed on one side of the first annular ridge 83 close to the second valve core 82, and the annular groove 23 is arranged corresponding to the axial surface of the second valve core 82, thereby reducing the contact area between the second valve core 82 and the first annular ridge 83, increasing the pressure, increasing the abutment effect, and ensuring the sealing performance; at the same time, the pressure is increased, and the elastic restoring force of the first elastic member 84 can be correspondingly improved, so that when the pressure at the air outlet end 3 is reduced due to some reasons (leakage, etc.), the second valve core 82 can be better opened to ensure the restoration of the second valve core 82.

[0075] It can be seen from the present embodiment that by adopting the setting of the first elastic member 84 and making it resist the second valve core 82 from approaching the first annular convex edge 83, when the pressure in the pipeline is too large and when the force brought by the high pressure is greater than the resistance force of the first elastic member 84, the second valve core 82 is pushed to approach the first annular convex edge 83 to achieve a self-closing effect, and after the pipeline pressure is restored, it is reset under the action of the first elastic member 84 and the gas valve is opened. The whole process is carried out automatically, effectively eliminating the impact of pressure fluctuations in the pipeline on gas safety.

[0076] Embodiment 3:

[0077] This embodiment provides a gas valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features. The high-temperature self-closing component 9 includes:

[0078] The second bracket 90 is mounted on the inner wall of the air inlet end 2;

[0079] The third valve stem 91 is installed in the air inlet end 2, and one end of the third valve stem 91 passes through the second bracket 90 and is provided with a block 92 for limiting the movement of the third valve stem 91, and the other end is provided with a third valve core 93;

[0080] The second annular convex edge 94 is installed on the inner wall of the air inlet end 2 and is used to cooperate with the third valve core 93 to realize the opening and closing of the vent hole 5;

[0081] The second elastic member 95 is mounted on the second bracket 90 and is used to force the third valve core 93 to approach the second annular protrusion 94;

[0082] The block 92 will melt at high temperature and release the restriction on the third valve stem 91;

[0083] At the same time, the third valve stem 91 and the third valve core 93 are of an integrated structure, and the surface of the third valve stem 91 is provided with an external thread, which is threadedly connected to the clamping block 92, and the second annular protrusion 94 and the valve body 1 are of an integrated structure, and the second bracket 90 is fixed by a clamping spring 15;

[0084] Furthermore, the second elastic member 95 can be a spring and sleeved on the third valve stem 91, and the clamping block 92 can be made of plastic.

[0085] It can be seen from the present embodiment that by placing the second elastic member 95 in an energy storage state, when the block 92 for limiting the movement of the third valve stem 91 melts due to high temperature, the restriction on the third valve stem 91 is released, thereby releasing the stored energy of the second elastic member 95, pushing the third valve core 93 and the second annular ridge 94 to seal, thereby achieving self-closing and effectively ensuring gas safety. In particular, when there is an open flame at the gas outlet 3, it can effectively prevent continuous leakage of gas and ensure safety.

[0086] Embodiment 4:

[0087] This embodiment provides a gas valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0088] A connecting rod 10, one end of which is clamped with the first valve stem 6, and the other end of which is connected with the handle 7;

[0089] A third elastic member 11 is sleeved at the connection between the first valve stem 6 and the connecting rod 10 and is used to promote the connecting rod 10 to move away from the first valve stem 6;

[0090] The valve body 1 is provided with an L-shaped slot 12 at the connection between the first valve stem 6 and the connecting rod 10, and the side of the connecting rod 10 is provided with a protrusion 13 slidably connected to the L-shaped slot 12; and the connecting rod 10 can be offset along the axial direction of the first valve stem 6, and when the connecting rod 10 is offset, it is always engaged with the first valve stem 6;

[0091] At the same time, an integrated structure can be adopted between the connecting rod 10 and the protrusion 13, and an interference fit can be adopted between the connecting rod 10 and the handle 7. A sliding groove is provided on the first valve stem 6, and the connecting rod 10 is slidably connected to the sliding groove, and the radial cross-section of the sliding groove is not a perfect circle.

[0092] It can be seen from this embodiment that, through the arrangement of the L-shaped slide groove 12 and the protrusion 13 on the side of the connecting rod 10, after the handle 7 drives the first valve core 4 to be closed through the first valve stem 6, the protrusion 13 can be pushed into the L-shaped slide groove 12 under the action of the third elastic member 11, thereby limiting the radial circumferential rotation of the handle 7, preventing the first valve core 4 from being opened due to accidental touching of the handle 7, and further improving the safety of the use of the gas valve;

[0093] Furthermore, two L-shaped grooves 12 and two protruding portions 13 are provided, that is, they are symmetrically arranged with respect to the axis, which can further improve stability.

[0094] Embodiment 5:

[0095] This embodiment provides a gas valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0096] The valve body 1 is provided with a first annular groove 14 at the connecting rod 10 , and a retaining spring 15 is arranged in the first annular groove 14 for limiting the protrusion 13 in the L-shaped sliding groove 12 .

[0097] It can be seen from the present embodiment that, through the arrangement of the retaining spring 15 and the first annular groove 14, it is convenient to install the protrusion 13 on the connecting rod 10 through the L-shaped slide groove 12, and then restrict it through the retaining spring 15, which has the effect of simple structure and easy installation. At the same time, the retaining spring 15 also restricts the protrusion 13 in the L-shaped slide groove 12 in the future, so as to prevent the protrusion 13 from sliding out of the L-shaped slide groove 12.

[0098] Embodiment 6:

[0099] This embodiment provides a gas valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0100] An insulating structure 16 is provided on one side of the gas outlet end 3 close to the valve body 1;

[0101] The gas outlet end 3 is fixedly connected to the insulating structure 16 and is detachably connected to the valve body 1 through the insulating structure 16;

[0102] Meanwhile, the insulating structure 16 can be made of plastic.

[0103] It can be seen from this embodiment that by providing an insulating structure 16 between the valve body 1 and the gas outlet 3, the conduction of static electricity can be blocked, thereby further improving the safety of the gas valve.

[0104] Generally, static electricity is usually conducted from the air inlet 2 to the air outlet 3 of the gas valve. The insulating structure 16 is arranged on the side of the air outlet 3 close to the valve body 1, thereby preventing static electricity on the body from being conducted to the air outlet 3 when the gas valve is manually opened in winter, thereby further ensuring safety of use.

[0105] Embodiment 7:

[0106] This embodiment provides a gas valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0107] The insulating structure 16 includes a first connecting portion 160 and a second connecting portion 161, and the air outlet end 3 is sleeved on the first connecting portion 160;

[0108] The first connection portion 160 is provided with a plurality of protrusions 17 on its circumference, and the air inlet end 2 is provided with circular holes 18 adapted to the plurality of protrusions 17;

[0109] At the same time, the first connection part 160 and the second connection part 161 are an integrated structure, and can be directly injection molded on the surface of the gas outlet end 3 of the metal material;

[0110] Furthermore, the second connection portion 161 and the valve body 1 may be fixedly connected by bolts, and the bolt heads do not contact the gas outlet end 3 .

[0111] It can be seen from the present embodiment that by including the first connecting part 160 and the second connecting part 161 in the insulating structure 16, it is convenient to connect with the valve body 1 through the second connecting part 161, and the multiple protrusions 17 arranged on the surface of the first connecting part 160 and the circular holes 18 adapted to the protrusions 17 are opened on the air inlet end 2, which can effectively improve the connection strength between the two and ensure the structural stability.

[0112] Embodiment 8:

[0113] This embodiment provides a gas valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features, including:

[0114] The valve seat 19 is installed in the valve body 1 and is located on both sides of the first valve core 4 close to the air inlet end 2 and the air outlet end 3;

[0115] The second connecting portion 161 is provided with a second annular groove 20 for mounting the valve seat 19 , and annular reinforcing ribs 21 are formed on both sides of the second annular groove 20 in the radial direction.

[0116] It can be seen from the present embodiment that by setting the second annular groove 20, the installation accuracy and stability of the valve seat 19 can be improved, and by setting the second annular groove 20, annular reinforcement ribs 21 are formed on both radial sides thereof, which can improve the structural strength of the second connecting part 161 and reduce the influence of its structural strength caused by the use of plastic as its material.

[0117] Embodiment 9:

[0118] This embodiment provides a gas valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0119] A sealing ring 22 is provided between the second connecting portion 161 and the air inlet end 2 and between the first valve stem 6 and the valve body 1;

[0120] The sealing ring 22 may be made of rubber.

[0121] It can be seen from this embodiment that the provision of the sealing ring 22 can effectively ensure the connection sealing performance of the gas valve connection, avoid gas leakage, and ensure safety.

[0122] Embodiment 10:

[0123] This embodiment provides a gas valve automatic control method, comprising the following steps:

[0124] S1: Install the gas valve in the gas pipeline and test its air tightness;

[0125] S2: Press the handle 7 so that the protrusion 13 enters the radial side from the axial side of the L-shaped slide groove 12, and then turn the handle 7 to open the first valve core 4, the gas valve is turned on, and gas is supplied normally;

[0126] S3: When the gas pressure in the gas pipeline increases, the force brought by the gas pressure will prompt the second valve core 82 to drive the second valve stem 81 to offset the resistance force of the first elastic member 84, and push the second valve core 82 to abut against the first annular convex edge 83, thereby blocking the transmission of the gas;

[0127] S4: When the gas pressure in the gas pipeline decreases, the force brought by the gas pressure is smaller than the resistance force of the first elastic member 84, and the second valve core 82 is separated from the first annular convex edge 83 under the action of the restoring force of the first elastic member 84, and the gas delivery is restored;

[0128] S5: When the temperature in the gas pipeline rises, the high temperature will cause the block 92 to melt and release the restriction of the third valve stem 91. The third valve core 93 will abut against the second annular ridge 94 under the action of the restoring force of the second elastic member 95 to block the delivery of the gas.

[0129] It can be seen from this embodiment that the handle 7 can be rotated only by pressing the handle 7 to compress the third elastic member 11, which effectively improves safety and avoids accidental touch.

[0130] At the same time, the L-shaped slide groove 12 is used so that the handle 7 is locked only in the closed state. When it is in the open state, the radial rotation of the handle 7 is not restricted, so as to prevent the gas valve from being unable to be closed due to tension and anxiety when an unexpected situation occurs;

[0131] When the gas pressure in the gas pipeline increases, the force generated by the gas pressure will offset the resistance force of the first elastic member 84, thereby pushing the second valve core 82 to cooperate with the first annular convex edge 83 to cut off the delivery at the gas valve, ensuring safety, and when the gas pressure returns to normal, the gas valve can be automatically reopened, with good self-control effect. At the same time, as the pressure changes, the degree of compression of the first elastic member 84 is different, that is, the gap between the second valve core 82 and the first annular convex edge 83 is different, and the gap can be adjusted in real time by the beating of the first elastic member 84, which has a certain degree of pressure stabilization effect on the gas pressure at the gas outlet 3;

[0132] The third valve stem 91 is restricted by a high-temperature melting block 92. When high temperature is generated, the block 92 will melt and the restriction on the third valve stem 91 will be released. Then, under the action of the second elastic member 95, the third valve core 93 cooperates with the second annular ridge 94 to cut off the delivery at the gas valve, thereby ensuring safety.

[0133] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A gas valve, characterized in that: include: A valve body (1) comprising an air inlet end (2) and an air outlet end (3); A first valve core (4) is installed in the valve body (1) and is provided with a vent hole (5) communicating with the air inlet end (2) and the air outlet end (3), and is used for opening and closing the valve body (1); A first valve stem (6) is installed in the valve body (1), one end of which extends out of the valve body (1) and is provided with a handle (7), and the other end of which is engaged with the first valve core (4) and is used to drive the first valve core (4) to rotate to realize opening and closing of the valve body (1); The self-closing mechanism comprises a high-pressure self-closing component (8) installed in a first valve core (4) and a high-temperature self-closing component (9) installed at an air inlet end (2).

2. The gas valve according to claim 1, characterized in that: The high-pressure self-closing component (8) comprises: A first bracket (80) is installed in the first valve core (4); A second valve stem (81) is slidably connected to the first bracket (80), and a second valve core (82) is provided at one end close to the gas outlet end (3); A first annular protrusion (83) is mounted on the inner wall of the vent hole (5) and is used to cooperate with the second valve core (82) to realize the opening and closing of the vent hole (5); A first elastic member (84) is mounted on the first bracket (80) and is used to prevent the second valve core (82) from approaching the first annular protrusion (83); When the force brought by the high pressure is greater than the resisting force of the first elastic member (84), the second valve core (82) moves closer to the first annular protrusion (83).

3. The gas valve according to claim 1, characterized in that: The high temperature self-closing component (9) comprises: A second bracket (90) is mounted on the inner wall of the air inlet end (2); A third valve stem (91) is installed in the air inlet end (2), and one end of the third valve stem (91) passes through the second bracket (90) and is provided with a block (92) for limiting the movement of the third valve stem (91), and the other end of the third valve stem (93) is provided; A second annular convex edge (94) is mounted on the inner wall of the air inlet end (2) and is used to cooperate with the third valve core (93) to realize the opening and closing of the vent hole (5); A second elastic member (95) is mounted on the second bracket (90) and is used to force the third valve core (93) to approach the second annular protrusion (94); The block (92) will melt at high temperature and release the restriction on the third valve stem (91).

4. The gas valve according to claim 1, characterized in that: Also includes: A connecting rod (10), one end of which is clamped with the first valve stem (6) and the other end of which is connected with the handle (7); A third elastic member (11) is sleeved at the connection between the first valve stem (6) and the connecting rod (10) and is used to promote the connecting rod (10) to move away from the first valve stem (6); The valve body (1) is provided with an L-shaped groove (12) at the connection between the first valve stem (6) and the connecting rod (10), and the side of the connecting rod (10) is provided with a protrusion (13) slidably connected to the L-shaped groove (12); the connecting rod (10) can be offset along the axial direction of the first valve stem (6), and when the connecting rod (10) is offset, it is always clamped with the first valve stem (6).

5. The gas valve according to claim 4, characterized in that: The valve body (1) is provided with a first annular groove (14) at the connecting rod (10), and a retaining spring (15) is arranged in the first annular groove (14) and is used to restrict the protrusion (13) in the L-shaped sliding groove (12).

6. The gas valve according to claim 1, characterized in that: An insulating structure (16) is provided on a side of the gas outlet end (3) close to the valve body (1); The gas outlet end (3) is fixedly connected to the insulating structure (16), and is detachably connected to the valve body (1) via the insulating structure (16).

7. The gas valve according to claim 6, characterized in that: The insulating structure (16) comprises a first connecting portion (160) and a second connecting portion (161), and the air outlet end (3) is sleeved on the first connecting portion (160); The first connection portion (160) is provided with a plurality of protruding columns (17) on its circumference, and the air inlet end (2) is provided with a circular hole (18) adapted to the plurality of protruding columns (17).

8. The gas valve according to claim 7, characterized in that: Also includes: A valve seat (19) is installed in the valve body (1) and is located on both sides of the first valve core (4) close to the air inlet end (2) and the air outlet end (3); The second connecting portion (161) is provided with a second annular groove (20) for mounting the valve seat (19), and annular reinforcing ribs (21) are formed on both sides of the second annular groove (20) in the radial direction.

9. The gas valve according to claim 7, characterized in that: Sealing rings (22) are provided between the second connecting portion (161) and the air inlet end (2), and between the first valve stem (6) and the valve body (1).

10. An automatic control method for a gas valve according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Install the gas valve in the gas pipeline and test its air tightness; S2: Pressing the handle (7) causes the protrusion (13) to enter the radial side from the axial side of the L-shaped slide groove (12), and then turning the handle (7) to open the first valve core (4), so that the gas valve is turned on and gas is supplied normally; S3: When the gas pressure in the gas pipeline increases, the force brought by the gas pressure will prompt the second valve core (82) to drive the second valve stem (81) to offset the resistance force of the first elastic member (84), and push the second valve core (82) to abut against the first annular convex edge (83), thereby blocking the transmission of the gas; S4: When the gas pressure in the gas pipeline decreases, the force brought by the gas pressure is smaller than the resisting force of the first elastic member (84), and under the action of the restoring force of the first elastic member (84), the second valve core (82) is separated from the first annular protrusion (83), and the gas delivery is restored; S5: When the temperature in the gas pipeline rises, the high temperature will cause the block (92) to melt and release the restriction of the third valve stem (91). The third valve core (93) will abut against the second annular ridge (94) under the action of the restoring force of the second elastic member (95), thereby blocking the delivery of the gas.

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