A gas overcurrent protection device

Abstract

The present application relates to a gas overflow protection device, which relates to the field of gas overflow protection, including a valve body, wherein the first protrusion inside the valve body divides the inside of the valve body into a first working area and a second working area, wherein the first working area is located at the air intake front end of the first protrusion and is connected to the second working area located at the air intake rear end of the first protrusion through a channel inside the first protrusion; a cut-off mechanism is arranged in the first working area on the valve body; and a starting mechanism is arranged in the second working area on the valve body. The channel in the first working area is smooth and has no obstacles to movement, so that the cut-off mechanism can better cut off the overflowing gas, reducing the risk of gas leakage, and the cut-off mechanism is located at the front end of the starting mechanism, so that when the starting mechanism operates to open the cut-off mechanism, the collision and wear of the cut-off mechanism are small, and the starting mechanism and the cut-off mechanism are not prone to structural jamming, resulting in the inability to open the gas channel, effectively ensuring the stability of the product structure.

Description

Technical Field

[0001] The present application relates to the field of gas overflow protection, and in particular to a gas overflow protection device. Background Art

[0002] The gas overcurrent protection device is also called the gas overcurrent valve or the gas overcurrent cut-off valve. The function of the gas overcurrent valve is to cut off the medium flow channel when the medium in the bottled liquefied petroleum gas pipeline leaks a large amount of flow and the flow rate is too large. The gas overcurrent valve is often used in bottled liquefied gas supply systems, so the gas overcurrent valve is usually used together with the pressure reducing valve. When the gas channel leaks, the gas overcurrent valve will automatically cut off the front end of the gas channel to prevent the gas from continuing to leak and protect the lives and property of the people.

[0003] However, the shut-off mechanism and starting mechanism of the conventional gas over-flow valve are usually located in the same working area. After the gas over-flow is cut off by this structure, the consumer needs to open the starting mechanism in the same working area of ​​the shut-off mechanism. The starting mechanism is prone to collision and wear with the shut-off mechanism during operation. Over time, the shut-off mechanism and the starting mechanism wear each other seriously, which reduces the performance of the shut-off mechanism and the starting mechanism at the same time. In severe cases, the shut-off mechanism cannot cut off the over-flowing gas, causing gas leakage, which is prone to explosion and fire, endangering the lives and property of the people. Summary of the invention

[0004] In order to reduce the mutual wear between the cut-off mechanism and the starting mechanism during the use of the gas overflow valve, improve the performance of the gas overflow valve, reduce the risk of gas leakage, and ensure the safety of people's lives and property, the present application provides a gas overflow protection device, which divides the interior of the valve body into a first working area and a second working area that are connected by a first protrusion formed inside the valve body, and the cut-off mechanism and the starting mechanism are respectively installed in the first working area and the second working area, and the cut-off mechanism is located at the air intake front end of the starting mechanism, so that when the starting mechanism is actuated to open the cut-off mechanism, the collision and wear of the starting mechanism on the cut-off mechanism are relatively small, thereby ensuring the performance of the cut-off mechanism and enabling the switching mechanism to better cut off the overflowing gas, thereby reducing the risk of gas leakage.

[0005] The present application provides a gas overcurrent protection device, which adopts the following technical solution:

[0006] A gas over-current protection device, comprising

[0007] A valve body, wherein the interior of the valve body is divided into a first working area and a second working area by a first protrusion inside the valve body, wherein the first working area is located at an air intake front end of the first protrusion and is connected to the second working area located at an air intake rear end of the first protrusion through a channel inside the first protrusion;

[0008] A cut-off mechanism, disposed in the first working area of ​​the valve body, for cutting off the overflow of gas; and

[0009] The starter mechanism is located in the second working area of ​​the valve body and is used to open the cut-off mechanism to resume the flow of gas in the valve body.

[0010] Preferably, the cutting mechanism comprises

[0011] A leak-proof pad is disposed in the first working area inside the valve body and abuts against the first protrusion, the inside of the leak-proof pad is a gas channel, and the outside of the leak-proof pad is sealed and connected to the inner wall of the valve body; and

[0012] The sealing ball is arranged in the first working area of ​​the valve body and at the air inlet front end of the leak-proof pad, and is used in conjunction with the leak-proof pad to seal the gas channel inside the leak-proof pad.

[0013] Preferably, the cut-off mechanism further comprises an air inlet joint which is threadedly connected to the valve body and is located at the front end of the sealing ball, the air inlet joint seals the sealing ball in the first working area, and a gas passage is provided on the air inlet joint.

[0014] Preferably, a filter screen for filtering the gas is provided on the gas inlet connector.

[0015] Preferably, the starting mechanism comprises

[0016] A push rod is arranged in the second working area of ​​the valve body and at the rear end of the gas outlet of the anti-leakage pad. Concave parts for gas to pass through are formed on both sides of the push rod. The front end of the push rod for gas inlet can contact the sealing ball and push open the sealing ball blocked on the anti-leakage pad. A starting surface is formed at the rear end of the push rod for gas inlet;

[0017] A first return spring is arranged in the second working area of ​​the valve body and sleeved on the air inlet front end of the push rod, with two ends respectively abutting against the first protrusion inside the valve body and the air inlet rear end of the push rod, for returning the push rod to the original position;

[0018] A limit block is located in the second working area of ​​the valve body and is threadedly connected to the inner wall of the valve body, and a gas channel is formed inside the limit block to limit the push rod to prevent the push rod from separating from the valve body; and

[0019] The starting assembly is arranged on the valve body and is perpendicular to the push rod. It is used to abut against the starting surface to push the push rod to move inside the valve body to push open the sealing ball on the anti-leakage pad so that the valve body can resume air supply.

[0020] Preferably, a slide groove is formed on the inner wall of the valve body, a sliding block is formed on the push rod, and the sliding block is located in the slide groove and slides in the slide groove.

[0021] Preferably, the starting surface is a smooth inclined surface.

[0022] Preferably, the startup component includes

[0023] A starter connector, fixed to the valve body, with a second protrusion formed inside; and

[0024] The starting rod is passed through and slidably connected to the inside of the starting joint, and the outside of the starting rod is sealed with the starting joint. The bottom of the starting rod can abut against the starting surface to push the top rod to move.

[0025] Preferably, the starting assembly also includes a starting switch fixedly connected to the end of the starting rod away from the top rod and a second reset spring arranged inside the starting joint for resetting the starting switch, and the two ends of the second reset spring respectively abut against the second protrusion inside the starting joint and the inner wall of the starting switch.

[0026] Preferably, the bottom of the starting rod is always in contact with the starting surface.

[0027] In summary, this application includes the following beneficial technical effects:

[0028] 1. The gas overflow protection device installs the cut-off mechanism and the starting mechanism in different first working areas and second working areas inside the valve body respectively, so that when the starting mechanism starts the cut-off mechanism after passing through the first protrusion, the collision and wear of the cut-off mechanism are small, thereby ensuring the performance of the cut-off mechanism, enabling the switching mechanism to better cut off the overflowing gas and reducing the risk of gas leakage.

[0029] 2. The starting mechanism of the gas overflow protection device is located at the rear end of the cut-off mechanism. Compared with the traditional gas overflow valve in which the starting mechanism is located at the front end of the cut-off mechanism, after the cut-off mechanism cuts off the overflowing gas, the risk of gas leakage at the starting mechanism is reduced.

[0030] 3. The sealing ball and the anti-leakage pad of the cutting mechanism are in linear contact when cutting off the gas. Compared with the point contact cutting mode of the traditional gas flow valve, the linear contact cutting has better cutting performance, better cutting effect on the flowing gas, reduces gas leakage, and has a broader development prospect.

[0031] 4. When the starting rod of the starting mechanism pushes the push rod through the first protrusion to push the sealing ball off the leak-proof pad, the collision and wear on the sealing ball are relatively small. After the starting rod is released, under the elastic force of the second return spring and the first return spring, the starting rod and the push rod can be quickly reset to facilitate the next action of the starting mechanism on the sealing ball.

[0032] 5. The starting surface of the push rod is a smooth inclined surface, so that the bottom of the starting rod is not easy to get stuck with the push rod when pushing the push rod. The starting mechanism quickly opens the cut-off mechanism to restore the flow of gas supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is an axonometric diagram of the gas overflow protection device of an embodiment of the present application.

[0034] Figure 2 yes Figure 1 Schematic diagram of the full cross-section structure.

[0035] Figure 3 yes Figure 1 Schematic diagram of the structure of the valve body cut away.

[0036] Figure 4 It is a structural schematic diagram of the valve body cross section.

[0037] Figure 5 It is a structural diagram of the internal components of the valve body.

[0038] Figure 6 It is a structural schematic diagram of the combined installation of the gas over-flow protection device and the pressure reducing valve in the embodiment of the present application.

[0039] Explanation of the reference numerals: 1. valve body; 11. first protrusion; 12. first working area; 13. second working area; 14. slide groove; 2. cutting mechanism; 21. anti-leakage pad; 22. sealing ball; 23. air inlet joint; 24. filter screen; 25. air inlet rubber pad; 3. starting mechanism; 31. push rod; 311. air inlet front end of push rod; 312. air inlet rear end of push rod; 313. slider; 314. starting surface; 32. first return spring; 33. limit block; 4. starting assembly; 41. starting joint; 411. second protrusion; 42. starting rod; 421. shaft shoulder; 43. starting switch; 44. second return spring; 45. gasket; 5. pressure reducing valve. DETAILED DESCRIPTION

[0040] The present application is further described in detail below in conjunction with the accompanying drawings.

[0041] The embodiment of the present application discloses a gas over-flow protection device.

[0042] Reference Figure 1 and Figure 2 The gas over-flow protection device includes a valve body 1, a cut-off mechanism 2 and a starting mechanism 3.

[0043] Reference Figure 3 and Figure 4The interior of the valve body 1 is a hollow gas circulation area. Both ends of the valve body 1 are connected to the gas pipeline through threaded connections or plugged into the gas pipeline through quick connectors. A first protrusion 11 is formed inside the valve body 1. The first protrusion 11 separates the area inside the valve body 1 into a first working area 12 and a second working area 13. The middle area of ​​the first protrusion 11 is a gas channel. The first working area 12 and the second working area 13 are connected through the gas channel inside the first protrusion 11. The first working area 12 is located at the front end of the air intake of the second working area 13. The cut-off mechanism 2 is installed in the first working area 12 inside the valve body 1, and the starting mechanism 3 is installed in the second working area 13 inside the valve body 1, so that when the cut-off mechanism 2 cuts off the flowing gas, the parts of the cut-off mechanism 2 will not collide or wear with the parts of the starting mechanism 3, and when the starting mechanism 3 is actuated, the starting mechanism 3 passes through the gas channel inside the first protrusion 11 to open the cut-off mechanism 2, so that the gas can be smoothly restored to flow, and the cut-off mechanism 2 is located at the front end of the starting mechanism 3. Compared with the traditional installation method in which the cut-off mechanism 2 is located at the rear end of the starting mechanism 3, after the cut-off mechanism 2 cuts off the flowing gas, the front installation method of the cut-off mechanism 2 reduces the risk of gas leakage at the starting mechanism 3.

[0044] Reference Figure 2 and Figure 3 The cutting mechanism 2 includes a leak-proof pad 21, a sealing ball 22, an air intake joint 23, a filter screen 24 and an air intake rubber pad 25.

[0045] The leak-proof pad 21 is installed in the first working area 12 inside the valve body 1. The leak-proof pad 21 is a rubber pad. The interior of the leak-proof pad 21 is a gas channel. The outside of the leak-proof pad 21 is installed on the inner wall of the valve body 1 by interference fit. The outer wall of the leak-proof pad 21 is close to the inner wall of the valve body 1. The leak-proof pad 21 is located at the air inlet front end of the first protrusion 11 and the side end of the leak-proof pad 21 abuts against the side of the first protrusion 11.

[0046] Reference Figure 2 and Figure 3The sealing ball 22 is located in the first working area 12 inside the valve body 1, and the sealing ball 22 is located at the air inlet front end of the leakproof pad 21. The sealing ball 22 is a steel ball, and the outer surface of the sealing ball 22 is a smooth curved surface, and the outer surface of the sealing ball 22 needs to be polished. The sealing ball 22 is used in conjunction with the leakproof pad 21. The diameter of the sealing ball 22 is smaller than the diameter of the gas channel inside the leakproof pad 21. When leakage occurs at the rear end of the valve body 1, the gas inside the valve body 1 will flow over, which will cause the pressure at the rear end of the valve body 1 to decrease. Under the action of the gas, the sealing ball 22 will abut and block the leakproof pad 21, so that the gas cannot continue to flow backward through the leakproof pad 21, and the gas is cut off. In order to facilitate the sealing ball 22 and the leak-proof gasket 21 to cut off the gas, the internal channel of the leak-proof gasket 21 at the end away from the first protrusion 11 is in a truncated cone shape, and the diameter of the cone gradually decreases from the end away from the first protrusion 11 to the end close to the first protrusion 11, so that the sealing ball 22 and the leak-proof gasket 21 can better seal the interior of the valve body 1.

[0047] Reference Figure 2 and Figure 3 The air inlet joint 23 is threadedly connected to the inside of the air inlet front end of the valve body 1. When the valve body 1 is installed with the gas pipeline, the air inlet joint 23 is located inside the gas pipeline. A gas channel is formed inside the air inlet joint 23. The diameter of the gas channel inside the air inlet joint 23 is smaller than the diameter of the sealing ball 22. The air inlet joint 23 seals the sealing ball 22 in the first working area 12 between the leak-proof pad 21 and the air inlet joint 23. The filter net 24 is installed inside the air inlet joint 23. The filter net 24 mainly plays the role of filtering the gas flowing through the valve body 1. The air inlet rubber pad 25 is sleeved on the air inlet front end of the air inlet joint 23. When the valve body 1 is installed with the gas pipeline, the air inlet rubber pad 25 is attached to the inner wall of the gas pipeline.

[0048] Reference Figure 2 and Figure 3 The starting mechanism 3 includes a push rod 31 , a first return spring 32 , a limit block 33 and a starting assembly 4 .

[0049] Reference Figure 3 and Figure 5 The push rod 31 is located in the second working area 13 inside the valve body 1. The push rod 31 can be divided into two parts: a push rod air inlet front end 311 and a push rod air inlet rear end 312. The push rod air inlet front end 311 is rod-shaped, and the push rod air inlet rear end 312 is block-shaped. Both sides of the push rod air inlet rear end 312 are formed with recessed portions for gas circulation. When the push rod 31 moves inside the valve body 1, the push rod air inlet front end 311 can pass through the channel of the first protrusion 11 and extend into the first working area 12, thereby pushing open the sealing ball 22 sealed on the anti-leakage pad 21, so that the gas circulation supply inside the valve body 1 is restored.

[0050] Reference Figure 3 and Figure 5 The rear end 312 of the push rod for air inlet is formed with a starting surface 314, which is a smooth inclined surface, but the starting surface 314 includes but is not limited to a smooth curved surface and a rough inclined surface. At the same time, in order to facilitate the movement of the push rod 31 inside the valve body 1, a slider 313 is also formed on the top of the push rod 31, and a slide groove 14 is also provided on the inner wall of the second working area 13 of the valve body 1. When the push rod 31 is installed, the slider 313 is installed in the slide groove 14, so that the push rod 31 can slide inside the valve body 1.

[0051] Reference Figure 3 and Figure 5 The first return spring 32 is located in the second working area 13 inside the valve body 1, and the first return spring 32 is sleeved on the front end 311 of the push rod air inlet, and the two ends of the first return spring 32 are respectively abutted against the first protrusion 11 and the rear end 312 of the push rod air inlet.

[0052] Reference Figure 3 and Figure 5 The limit block 33 is also located in the second working area 13. The limit block 33 is threadedly connected to the inner wall of the valve body 1. A gas channel is formed inside the limit block 33. The limit block 33 can limit the push rod 31. When the first return spring 32 bounces the push rod 31 open, the air intake rear end 312 of the push rod can abut against the limit block 33 to prevent the push rod 31 from moving out of the second working area 13 of the valve body 1 and falling into the gas pipeline under the action of the elastic force of the first return spring 32. At the same time, the limit block 33 can also limit the push rod 31 at ordinary times. In the process of taking and placing the gas overcurrent protection device or installing the gas overcurrent protection device, the limit block 33 can prevent the push rod 31 and the first return spring 32 from escaping from the inside of the valve body 1.

[0053] Reference Figure 2 and Figure 3 The starting assembly 4 includes a starting joint 41 and a starting rod 42.

[0054] The starter connector 41 is connected to the valve body 1 by threaded connection or quick plug. A second protrusion 411 is formed inside the starter connector 41. The starter rod 42 is inserted into the starter connector 41 and is slidably connected to the inner wall of the starter connector 41. The top of the starter rod 42 extends out of the second protrusion 411. The starter rod 42 is provided with a shaft shoulder 421. The shaft shoulder 421 of the starter rod 42 is located in the area between the second protrusion 411 and the valve body 1. The shaft shoulder 421 of the starter rod 42 can abut against the second protrusion 411. After the starter connector 41 is installed on the valve body 1, the starter rod 42 is perpendicular to the push rod 31. The bottom of the starter rod 42 can extend into the second working area 13 of the valve body 1 and abut against the starter surface 314 of the push rod 31. The starter rod 42 is continuously pressed downward. The force applied by the starter rod 42 to the starter surface 314 is decomposed to form a lateral force to overcome the elastic force of the first return spring 32 and push the push rod 31 to move inside the valve body 1. The front end 311 of the push rod passes through the first protrusion 11 to push open the sealing ball 22 on the anti-leakage pad 21, so that the gas inside the valve body 1 can resume circulation. At the same time, in order to prevent the gas from leaking from the gap between the starter rod 42 and the starter joint 41, an O-ring is installed between the starter rod 42 and the second protrusion 411 of the starter joint 41, and the O-ring seals the starter rod 42 and the starter joint 41.

[0055] In other embodiments, the starting rod 42 can also be set at an angle with the push rod 31. The starting rod 42 does not need to be perpendicular to the push rod 31. It is only necessary to make the bottom of the starting rod 42 abut against the starting surface 314 and have a decomposed lateral force on the starting surface 314, and the lateral force can push the push rod 31 to slide inside the valve body 1.

[0056] Reference Figure 2 and Figure 3 After the starting rod 42 is used to push the push rod 31 to push the sealing ball 22 on the leakproof pad 21, the push rod 31 moves backward under the elastic force of the first return spring 32, and the push rod 31 is reset backward. In order to facilitate pressing the starting rod 42 and resetting the starting rod 42 on the starting joint 41, the starting assembly 4 also includes a starting switch 43 and a second return spring 44. The starting switch 43 is fixed to the top of the starting rod 42, the second return spring 44 is located inside the starting joint 41, and the second return spring 44 is sleeved on the end of the starting rod 42 away from the valve body 1. The two ends of the second return spring 44 are respectively abutted against the end of the second protrusion 411 away from the shoulder 421 of the starting rod 42 and the inner wall of the starting switch 43. After the starting switch 43 is pressed to push the push rod 31 to move, the starting switch 43 drives the starting rod 42 to move and reset under the elastic force of the second return spring 44.

[0057] Reference Figure 2 and Figure 3In order to further seal the starting rod 42 and the starting joint 41, an O-ring is also installed on the side of the second protrusion 411 away from the shoulder 421 of the starting rod 42, and the O-ring seals the other side of the second protrusion 411. In order to facilitate the resetting of the second return spring 44 and to avoid the second return spring 44 from squeezing the O-ring, a gasket 45 is provided between the O-ring and the second return spring 44, and the second return spring 44 abuts against the gasket 45, and the gasket 45 is squeezed onto the O-ring.

[0058] Reference Figure 3 and Figure 5 In order to facilitate the bottom of the starting rod 42 to push the push rod 31 to move in the valve body 1, the bottom of the starting rod 42 can be set to a smooth curved surface or a hemispherical surface. At the same time, the bottom of the starting rod 42 always abuts against the starting surface 314 of the push rod 31, that is, after the starting rod 42 rebounds and resets, the bottom of the starting rod 42 still abuts against the starting surface 314, so that the bottom of the starting rod 42 abuts against the starting surface 314 and pushes the push rod 31 to move.

[0059] A first protrusion 11 formed inside the valve body 1 divides the inside of the valve body 1 into two independent working areas, a first working area 12 and a second working area 13, and the gas flow cut-off mechanism 2 is installed in the first working area 12 at the front end, and the starting mechanism 3 is installed in the second working area 13 at the rear end. When the starting mechanism 3 opens the front end cut-off mechanism 2, the wear on the parts of the cut-off mechanism 2 is less, and the impact on the cut-off sealing performance of the cut-off mechanism 2 is relatively low. After the cut-off mechanism 2 cuts off the flowing gas, compared with the traditional gas flow valve, the gas flow protection device reduces the risk of gas leakage of the starting mechanism 3 in the second working area 13, and extends the service life of the gas flow protection device.

[0060] The working principle of the embodiment of the present invention is as follows:

[0061] Reference Figure 3 and Figure 6 , when the gas flows through the valve body 1, when the outlet flow rate of the gas pipeline or the pressure reducing valve at the rear end of the gas overflow protection device is less than or equal to the rated flow rate, the flow rate in the first working area 12 is balanced, the sealing ball 22 is in a balanced state in the valve body 1, and the gas flows through the valve body 1 normally. When the gas pipeline or the pressure reducing valve 5 at the rear end of the gas overflow protection device causes the gas flow rate to exceed a certain proportion of the rated flow rate due to external or internal factors, a negative pressure will be quickly formed at the rear end of the gas overflow protection device, causing the flow rate of the gas in the first working area 12 to change. The sealing ball 22 moves to the rear end of the valve body 1 under the action of the negative pressure and the inlet pressure, and quickly presses against the inside of the anti-leakage pad 21 until the anti-leakage pad 21 completely seals the inside of the valve, so that the gas cannot flow out of the valve body 1, thereby cutting off the gas.

[0062] After the external or internal factors of the gas pipeline or the pressure reducing valve 5 are repaired, the starting switch 43 is pressed downward, and the starting switch 43 moves together with the starting rod 42, and the starting rod 42 abuts against the starting surface 314 of the push rod 31. Under the action of the starting rod 42, the push rod 31 slides in the slide groove 14 of the valve body 1 through the slider 313, and the air intake front end 311 of the push rod gradually passes through the channel of the first protrusion 11, enters the leak-proof pad 21 in the first working area 12 in the second working area 13, and pushes open the sealing ball 22 on the leak-proof pad 21, so that the gas gradually and smoothly resumes the circulation supply. After opening the sealing ball 22, the push rod 31 is gradually reset under the action of the first reset spring 32, and the starting rod 42 is gradually reset under the action of the second reset spring 44. After the gas flow rate of the sealing ball 22 in the first working area 12 is balanced, the sealing ball 22 is balanced in the first working area 12, so that the gas flows smoothly through the valve body 1.

[0063] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A gas overcurrent protection device, characterized in that: include A valve body, wherein the interior of the valve body is divided into a first working area and a second working area by a first protrusion inside the valve body, wherein the first working area is located at an air intake front end of the first protrusion and is connected to the second working area located at an air intake rear end of the first protrusion through a channel inside the first protrusion; A cut-off mechanism is provided in the first working area of ​​the valve body and is used to cut off the overflow of gas for protection; as well as A starting mechanism, disposed in the second working area of ​​the valve body, for opening the cut-off mechanism to restore the flow of gas in the valve body; The cutting mechanism comprises: A leak-proof pad is disposed in the first working area inside the valve body and abuts against the first protrusion, the inside of the leak-proof pad is a gas channel, and the outside of the leak-proof pad is sealed and connected to the inner wall of the valve body; and A sealing ball is arranged in the first working area of ​​the valve body and at the air inlet front end of the leak-proof pad, and is used in conjunction with the leak-proof pad to seal the gas channel inside the leak-proof pad; The cut-off mechanism also includes an air inlet joint which is threadedly connected to the valve body and is located at the front end of the sealing ball, the air inlet joint seals the sealing ball in the first working area, and a gas channel is provided on the air inlet joint; The starting mechanism comprises: A push rod is arranged in the second working area of ​​the valve body and at the rear end of the gas outlet of the anti-leakage pad. Concave parts for gas to pass through are formed on both sides of the push rod. The front end of the push rod for gas inlet can contact the sealing ball and push open the sealing ball blocked on the anti-leakage pad. A starting surface is formed at the rear end of the push rod for gas inlet; A first return spring is arranged in the second working area of ​​the valve body and sleeved on the air inlet front end of the push rod, with two ends respectively abutting against the first protrusion inside the valve body and the air inlet rear end of the push rod, for returning the push rod to the original position; A limit block is located in the second working area of ​​the valve body and is threadedly connected to the inner wall of the valve body, and a gas channel is formed inside the limit block to limit the push rod to prevent the push rod from separating from the valve body; and A starting assembly is provided on the valve body and is perpendicular to the push rod, and is used to abut against the starting surface to push the push rod to move inside the valve body to push open the sealing ball on the anti-leakage pad so that the valve body can resume air supply; A slide groove is formed on the inner wall of the valve body, and a slider is formed on the push rod. The slider is located in the slide groove and slides in the slide groove; The starting surface is a smooth inclined surface.

2. A gas over-current protection device according to claim 1, characterized in that: The air inlet connector is provided with a filter screen for filtering the fuel gas.

3. A gas over-current protection device according to claim 1, characterized in that: The startup component includes A starter connector is fixed to the valve body and has a second protrusion formed inside; as well as The starting rod is passed through and slidably connected to the inside of the starting joint, and the outside of the starting rod is sealed with the starting joint. The bottom of the starting rod can abut against the starting surface to push the top rod to move.

4. A gas over-current protection device according to claim 3, characterized in that: The starting assembly also includes a starting switch fixedly connected to an end of the starting rod away from the top rod and a second reset spring arranged inside the starting joint for resetting the starting switch, wherein the two ends of the second reset spring respectively abut against the second protrusion inside the starting joint and the inner wall of the starting switch.

5. A gas over-current protection device according to claim 3, characterized in that: The bottom of the starting rod is always in contact with the starting surface.

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