Tempering prevention device capable of automatically cutting off gas

Abstract

The invention provides a backfire prevention device capable of automatically cutting off gas. The backfire prevention device comprises a box body, a gas inlet pipe, a movable door, a gas outlet pipe, a handle and an explosion-proof film. And liquid is arranged in the box body. The gas inlet pipe is connected with the box body, and combustible gas in the gas inlet pipe enters the box body after passing through the liquid. The movable door is arranged on the air inlet pipe and used for closing or opening the air inlet pipe. The gas outlet pipe is connected with the box body and comprises a gas outlet and a pressure relief opening, and combustible gas in the box body flows out of the box body through the gas outlet. The handle is pivoted with the movable door, and the pressure relief opening faces the handle in the initial state. The explosion-proof film is arranged on the air outlet pipe and located between the air outlet and the pressure relief opening, the explosion-proof film seals and isolates the pressure relief opening, and when air pressure generated by tempering breaks through the explosion-proof film and pushes the handle through the pressure relief opening, the handle closes the movable door. The problem of secondary deflagration of an existing safe water seal is solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of tempering cut-off, and in particular to a tempering prevention device capable of automatically cutting off gas. BACKGROUND

[0002] An automatic hydrogen-oxygen cutting machine is used for cutting various scrap steels such as scrap plate blanks, scrap steel coils or scrap steel pipes into qualified metal materials required for steelmaking through hydrogen-oxygen cutting. The automatic hydrogen-oxygen cutting machine is a key equipment in the steelmaking material preparation link, has a high utilization rate, and is crucial for the smooth progress of the steelmaking production logistics.

[0003] Hydrogen-oxygen gas is a mixed gas in the proportion of H2O, and can be completely combusted without adding oxygen. Therefore, the hydrogen-oxygen gas has the characteristics of easy combustion, easy tempering and fast tempering speed in the pipeline, so tempering is a common fault of the hydrogen-oxygen cutting system. In order to prevent tempering, a dry combined tempering prevention device with a tempering ring and a safety valve can be used. However, the device has poor fire stopping effect in actual use, and after tempering, a series of problems such as burning of the fire stopping ring and filter core, leakage of the pressure relief valve, system overpressure, damage of the pressure switch or pressure transmitter, etc. are often caused, which not only increases the cost of spare parts, but also prolongs the downtime for maintenance, and seriously affects the steelmaking material preparation production.

[0004] A wet type new safety water seal is disclosed in Chinese patent CN201934728U, which comprises a tank body, a pipe body, a gas inlet pipe, a pressure relief valve and a water filter tank. A liquid is arranged in the tank body. When tempering occurs, the gas explodes in the pipe body at the upper part of the water seal and in the water filter tank, the pressure generated by the explosion gas is discharged by the pressure relief valve at the top of the water seal pipe body, and the pressure conducts the one-way valve to be closed through the liquid. The safety water seal can prevent the above-mentioned problems. However, since the one-way valve is closed, although the liquid can be prevented from entering the gas inlet pipe, the combustible gas in the gas inlet pipe can still enter the tank body to cause secondary explosion. Therefore, the existing safety water seal has the problem of secondary explosion. SUMMARY

[0005] The application aims to provide an automatic gas cut-off backfire prevention device which can avoid secondary explosion, comprising a box, an air inlet pipe, a movable door, an air outlet pipe, a handle and an explosion-proof membrane. A liquid is arranged in the box. The air inlet pipe is connected with the box, and combustible gas in the air inlet pipe enters the box after passing through the liquid. The movable door is arranged on the air inlet pipe, and is used to close or open the air inlet pipe. The air outlet pipe is connected with the box, and comprises an air outlet and a pressure relief port. The combustible gas in the box flows out of the box through the air outlet. The handle is pivotally connected with the movable door, and the pressure relief port faces the handle in the initial state. The explosion-proof membrane is arranged on the air outlet pipe and between the air outlet and the pressure relief port. The explosion-proof membrane seals and isolates the pressure relief port. When the gas pressure generated by backfire breaks the explosion-proof membrane and pushes the handle through the pressure relief port, the handle closes the movable door.

[0006] Optionally, the automatic gas cut-off backfire prevention device further comprises a protective cover which covers the pressure relief port and is connected with the air outlet pipe.

[0007] Optionally, the bottom of the air inlet pipe is connected with the box.

[0008] Optionally, the movable door comprises a valve body, a spring and a valve core. The valve body is connected with the air inlet pipe. The valve core is inserted into the valve body and is slidably connected with the valve body. The valve core locks the spring to the valve body. The valve core is pivotally connected with the handle. The handle abuts against the valve body. When the gas pressure generated by backfire breaks the explosion-proof membrane and pushes the handle through the pressure relief port, the handle releases the locking of the spring by the valve core, and the spring pushes the valve core to block the air inlet pipe.

[0009] Optionally, the valve core comprises a stopper and a push rod. The stopper is connected with the push rod. The push rod is pivotally connected with the handle. The spring is sleeved on the push rod. Two ends of the spring abut against the valve body and the stopper respectively. When the gas pressure generated by backfire breaks the explosion-proof membrane and pushes the handle through the pressure relief port, the handle releases the locking of the spring by the stopper, and the spring pushes the stopper to block the air inlet pipe.

[0010] Optionally, the length direction of the valve core and the length direction of the air inlet pipe are arranged in parallel with each other. The length direction of the valve core and the length direction of the handle in the initial state are arranged in perpendicular with each other.

[0011] Optionally, the length direction of the air outlet pipe and the length direction of the handle in the initial state are arranged in perpendicular with each other.

[0012] Optionally, the automatically shut-off backfire prevention device further includes an air inlet, which is connected to the movable door.

[0013] Optionally, the automatic gas shut-off backfire prevention device further includes a sensor switch and a generator. The sensor switch and the generator are electrically connected, and the generator is connected to the air inlet pipe. When the handle closes the movable door, the sensor switch is triggered by the handle and generates a trigger signal. The generator stops generating combustible gas based on the trigger signal.

[0014] The beneficial effects of this application are as follows: It comprises a housing, an inlet pipe, a movable door, an outlet pipe, a handle, and an explosion-proof membrane. The housing contains liquid. The inlet pipe is connected to the housing, and combustible gas in the inlet pipe enters the housing after passing through the liquid. The movable door is located on the inlet pipe and is used to close or open the inlet pipe. The outlet pipe is connected to the housing and includes an outlet and a pressure relief port; combustible gas in the housing flows out of the housing through the outlet. The handle is pivotally connected to the movable door, with the pressure relief port facing the handle in its initial state. The explosion-proof membrane is located on the outlet pipe and between the outlet and the pressure relief port. The explosion-proof membrane seals and isolates the pressure relief port. When the gas pressure generated by backfire breaks through the explosion-proof membrane and pushes the handle through the pressure relief port, the handle closes the movable door.

[0015] Because the handle and the movable door are pivotally connected, and the pressure relief port faces the handle in its initial state, when the gas pressure generated by the backfire breaks through the explosion-proof membrane and pushes the handle through the pressure relief port, the handle closes the movable door. At this time, the air inlet pipe is completely closed, and combustible gas will no longer enter the box through the air inlet pipe, thus avoiding the problem of secondary deflagration.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, the following describes the application in detail with reference to the preferred embodiments and accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a front sectional view of a flashback prevention device with automatic gas shut-off in one embodiment of this application (handle in the initial state);

[0018] Figure 2 In one embodiment of this application, Figure 1 AA-line sectional view;

[0019] Figure 3 In one embodiment of this application, Figure 1 A magnified view from direction B;

[0020] Figure 4 In one embodiment of this application, Figure 3 The diagram shows the state of each component after the handle is turned counterclockwise (the valve core is in the state of blocking the through hole);

[0021] Figure 5 is a block diagram of a generator and an inductive switch in an embodiment of the present application.

[0022] In the drawings:

[0023] 1 box

[0024] 2 air inlet pipe

[0025] 3 movable door

[0026] 30 valve body

[0027] 31 valve core

[0028] 310 stop block

[0029] 311 push rod

[0030] 32 spring

[0031] 4 air outlet pipe

[0032] 40 air outlet

[0033] 41 pressure relief port

[0034] 5 handle

[0035] 50 horizontal part

[0036] 51 vertical part

[0037] 6 explosion-proof membrane

[0038] 7 protective cover

[0039] 8 pivot

[0040] 9 sealing gasket

[0041] 90 through hole

[0042] 10 air inlet

[0043] 11 inductive switch

[0044] 12 generator

[0045] 13 check valve DETAILED DESCRIPTION

[0046] The manner in which the application can be embodied can be understood by persons skilled in the art from the foregoing description of specific embodiments thereof and upon reading the further description of the preferred embodiments following hereinafter and their practical application to the purpose indicated. Other advantages of the present application will be readily suggested by such disclosure and further understood from the drawings and the description that follows hereby.

[0047] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. In order to enable those skilled in the art to better understand the present application scheme, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0048] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units need not be limited to those clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0049] It should be noted that unless otherwise expressly specified and limited, the terms "mount", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] As shown in Figure 1 , in the present embodiment, a backfire prevention device capable of automatic gas cutting is provided, which comprises a box body 1, an air inlet pipe 2, a movable door 3, an air outlet pipe 4, a handle 5 and an explosion-proof membrane 6. The box body 1 is provided with a liquid. The air inlet pipe 2 is connected with the box body 1, and the combustible gas in the air inlet pipe 2 enters the box body 1 after passing through the liquid. The movable door 3 is arranged on the air inlet pipe 2, and is used to close or open the air inlet pipe 2. The air outlet pipe 4 is connected with the box body 1, and the air outlet pipe 4 comprises an air outlet 40 and a pressure relief port 41 (for reference Figure 2 , the same below), and the combustible gas in the box body 1 flows out of the box body 1 through the air outlet 40. The handle 5 is pivotally connected with the movable door 3, and the pressure relief port 41 is directed towards the handle 5 in the initial state. The explosion-proof membrane 6 is arranged on the air outlet pipe 4 and located between the air outlet 40 and the pressure relief port 41, and the explosion-proof membrane 6 seals and isolates the pressure relief port 41. When the gas pressure generated by backfire breaks the explosion-proof membrane 6 and pushes the handle 5 through the pressure relief port 41, the handle 5 closes the movable door 3.

[0051] AsFigure 1 As shown in , the gas outlet 40 can be arranged on the right side of the top of the gas outlet pipe 4. The combustible gas flows out of the gas outlet 40 and is used for cutting. The axial direction of the gas outlet 40 can be horizontal. The liquid can be water, and the combustible gas can be filtered by the liquid. The combustible gas can be hydrogen-oxygen gas, acetylene, propane, or propylene, etc. The gas outlet pipe 4 can be connected to the top of the box body 1 by screwing or welding. After the new explosion-proof membrane 6 is replaced, the handle 5 can be pulled back to the initial position by the operator to prevent the next backfire.

[0052] As shown in Figure 2 , the pressure relief port 41 can be arranged at the top end of the gas outlet pipe 4, and the axial direction of the pressure relief port 41 can be vertical. As shown in Figure 1 , the left end of the handle 5 can be pivotally connected to the movable door 3. The explosion-proof membrane 6 can be connected to the top of the gas outlet pipe 4 by flanges, for example, the explosion-proof membrane 6 can be clamped between the two flanges arranged opposite to each other. The explosion-proof membrane 6 can be an aluminum sheet. The explosion-proof membrane 6 will not burst when the box body 1 normally supplies combustible gas. When the gas pressure in the box body 1 increases due to backfire, the explosion-proof membrane 6 will burst. Backfire refers to the flame retreating from the gas outlet 40 into the box body 1.

[0053] Please refer to Figure 1 and Figure 3 , the handle 5 includes a horizontal part 50 and a vertical part 51. The horizontal part 50 and the vertical part 51 can be integrally connected. The handle 5 can be L-shaped. The bottom of the vertical part 51 is in contact with the top of the valve body 30. The horizontal part 50 can be wedge-shaped. The length direction of the horizontal part 50 can be perpendicular to the length direction of the vertical part 51. For example, the length direction of the horizontal part 50 can be horizontal. The length direction of the vertical part 51 can be vertical.

[0054] Please refer to Figure 1 and Figure 2 , since the handle 5 is pivotally connected to the movable door 3, and the pressure relief port 41 is directed to the handle 5 in the initial state, when the gas pressure generated by backfire bursts the explosion-proof membrane 6 and pushes the handle 5 through the pressure relief port 41, the handle 5 closes the movable door 3, at this time the gas inlet pipe 2 is completely closed, and the combustible gas will not enter the box body 1 through the gas inlet pipe 2, avoiding the problem of secondary explosion. If the gas inlet pipe 2 is not completely closed, the combustible gas can still flow out through the gas outlet 40, and the backfire caused explosion (i.e. secondary explosion) can still occur.

[0055] As shown in Figure 2 , optionally, the backfire prevention device that can automatically cut off the gas further includes a protective cover 7, the protective cover 7 covers the pressure relief port 41, and the protective cover 7 is connected to the gas outlet pipe 4. The protective cover 7 is used to prevent the fragments of the explosion-proof membrane 6 from splashing and injuring people when backfire occurs. The protective cover 7 can be a metal mesh, which can be connected to the top of the gas outlet pipe 4 by welding.

[0056] As shown in Figure 2 , optionally, the air inlet pipe 2 is connected to the bottom of the tank 1. In this way, the combustible gas in the air inlet pipe 2 can enter from the bottom of the liquid, so that the combustible gas can fully contact the liquid at various depths, and the filtering effect of the liquid can be more fully utilized. The air inlet pipe 2 can be connected to the tank 1 through a check valve 13.

[0057] Please refer to Figure 3 and Figure 4 , optionally, the movable door 3 (the movable door 3 please refer to Figure 1 ) comprises a valve body 30, a spring 32 and a valve core 31, the valve body 30 is connected to the air inlet pipe 2, the valve core 31 is inserted into the valve body 30 and is slidably connected to the valve body 30, the valve core 31 locks the spring 32 to the valve body 30, the valve core 31 is pivoted to the handle 5, and the handle 5 abuts against the valve body 30. When the gas pressure generated by tempering breaks the explosion-proof membrane 6 and pushes the handle 5 through the pressure relief port 41 (the pressure relief port 41 please refer to Figure 2 ), the handle 5 releases the locking of the spring 32 by the valve core 31, and the spring 32 pushes the valve core 31 to block the air inlet pipe 2.

[0058] In this way, the blocking of the air inlet pipe 2 can be automatically realized without complex electronic control, so that the control of the valve core 31 is more convenient and the cost is lower. At the same time, due to the existence of the spring 32, before the handle 5 is not rotated, the spring 32 can also lock the valve core 31 in the opposite direction, so that the valve core 31 cannot act at will.

[0059] Please refer to Figure 1 and Figure 3 , the valve body 30 can be connected to the top of the air inlet pipe 2 by screwing, clamping or welding. The valve core 31 and the valve body 30 can be gap fit. The left end of the handle 5 can be pivoted to the top end of the valve core 31, and the valve core 31 can be rod-shaped. How the valve core 31 locks the spring 32 to the valve body 30 can be referred to the subsequent content of the embodiment.

[0060] Please refer to Figure 3 and Figure 4 , optionally, the valve core 31 comprises a block 310 and a push rod 311, the block 310 is connected to the push rod 311, the push rod 311 is pivoted to the handle 5, the spring 32 is sleeved on the push rod 311, and the two ends of the spring 32 abut against the valve body 30 and the block 310 respectively. When the gas pressure generated by tempering breaks the explosion-proof membrane 6 and pushes the handle 5 through the pressure relief port 41 (the pressure relief port 41 please refer to Figure 2 ), the handle 5 releases the locking of the spring 32 by the block 310, and the spring 32 pushes the block 310 to block the air inlet pipe 2. In this way, when the valve core 31 blocks the air inlet pipe 2, the spring 32 can be used to exert and maintain the blocking of the air inlet pipe 2 by the valve core 31, so that the gas pressure generated by tempering can be fully released.

[0061] As shown in Figure 3 , the stopper 310 and the push rod 311 can be connected by welding or one-piece forming. The stopper 310 can be arranged at the bottom of the push rod 311, and the top of the push rod 311 can be pivotally connected with the bottom of the vertical part 51 of the handle 5.

[0062] Please refer to Figure 3 and Figure 4 , the valve core 31 and the handle 5 can be pivotally connected by the pivot 8. The distance from the central axis of the pivot 8 to the top of the valve body 30 is greater than the width or diameter of the vertical part 51. The spring 32 can be a compression spring, and before the handle 5 is not rotated, the spring 32 is compressed between the stopper 310 and the top of the valve body 30. At this time, the spring 32 is locked by the handle 5 because the bottom of the vertical part 51 abuts against the top of the valve body 30. After the handle 5 is counterclockwise rotated around the pivot 8, the distance from the central axis of the pivot 8 to the top of the valve body 30 becomes smaller (at this time, the side of the vertical part 51 abuts against the valve body 30), the handle 5 releases the lock of the spring 32 by the valve core 31, and the valve core 31 moves downward under the pushing of the spring 32.

[0063] Please refer to Figure 3 and Figure 4 , the compression amount of the spring 32 is greater than the distance from the bottom of the stopper 310 to the sealing gasket 9, so that when the stopper 310 abuts against the sealing gasket 9, the spring 32 can apply pressure to the stopper 310 to assist the stopper 310 to block the sealing gasket 9. The valve core 31 and the vertical part 51 of the handle 5 can be pivotally connected by the pivot 8. The distance from the central axis of the pivot 8 to the top of the valve body 30 is greater than the width or diameter of the vertical part 51, so that when the handle 5 is counterclockwise rotated, the handle 5 can release the lock of the spring 32, and at this time, the stopper 310 can abut against the sealing gasket 9 under the elastic force of the spring 32.

[0064] Please refer to Figure 3 and Figure 4 , the spring 32 can also maintain the opening of the valve core 31 when the valve core 31 is open, thereby maintaining the stable pressure of the combustible gas in the inlet pipe 2. The stopper 310 can be a frustum, which is arranged at the bottom of the valve core 31. The sealing gasket 9 can be arranged between the stopper 310 and the inlet pipe 2, the sealing gasket 9 has a through hole 90 in the middle, and the stopper 310 can block the through hole 90 of the sealing gasket 9 when falling down, thereby blocking the inlet pipe 2. After the stopper 310 moves upward, the inlet pipe 2 is open, and the combustible gas can enter the inlet pipe 2 through the inlet 10 and the through hole 90. The axial direction of the through hole 90 can be vertical. The upper part of the valve body 30 can include a pipe sealing gasket and two flanges, the pipe sealing gasket is clamped between the two flanges, and the valve core 31 can be arranged between the pipe sealing gasket and the two flanges.

[0065] As shown in Figure 3As shown, optionally, the length direction of the valve core 31 and the length direction of the air inlet pipe 2 are arranged in parallel with each other, and the length direction of the valve core 31 and the length direction of the handle 5 in the initial state are arranged in perpendicular with each other. In this way, the up and down sliding of the valve core 31 can be realized by using one handle 5, so that the mechanism for moving the valve core 31 is simpler and the structure is more compact. For example, the length direction of the valve core 31 and the length direction of the air inlet pipe 2 can be vertical direction, and the length direction of the handle 5 can be horizontal direction (i.e. the horizontal part 50 of the handle 5 is horizontal direction). The handle 5 in the initial state is the handle 5 before the rupture of the explosion-proof membrane 6.

[0066] As shown, Figure 3 , optionally, the length direction of the air outlet pipe 4 and the length direction of the handle 5 in the initial state are arranged in perpendicular with each other. In this way, the upward air pressure generated by tempering can directly act on the handle 5, and there will be no pressure loss due to the turning pipe section of the air outlet pipe 4. For example, the length direction of the air outlet pipe 4 can be vertical direction.

[0067] Please refer to Figure 1 and Figure 3 , optionally, the tempering prevention device capable of automatically cutting off gas further comprises an air inlet 10, and the air inlet 10 is communicated with the movable door 3. In this way, compared with the air inlet 10 arranged above the movable door 3, the former can reduce the length of the handle 5 or the length of the valve core 31, so that the structure is more compact when the handle 5 and the valve core 31 are connected. The axial direction of the air inlet 10 can be horizontal direction. The air inlet 10 can be arranged above the through hole 90 and arranged at the left middle position of the valve body 30. The air inlet 10 can be connected with the generator 12 (the generator 12 please refer to Figure 5 ) through a pipeline.

[0068] Please refer to Figures 3 to 5 , optionally, the tempering prevention device capable of automatically cutting off gas further comprises an inductive switch 11 and a generator 12, the inductive switch 11 and the generator 12 are electrically connected, and the generator 12 is connected with the air inlet pipe 2. When the handle 5 closes the movable door 3 (the movable door 3 please refer to Figure 1 ), the inductive switch 11 is triggered by the handle 5 and generates a trigger signal, and the generator 12 stops generating combustible gas based on the trigger signal. In this way, when tempering occurs, the combustible gas can be prevented from entering the air inlet pipe 2, and the closing reliability of the air inlet pipe 2 is increased.

[0069] Please refer to Figure 4 and Figure 5 , the inductive switch 11 can be a photoelectric inductive switch or a magnetic inductive switch. The inductive switch 11 and the generator 12 can be electrically connected through a cable. The axial direction of the inductive head of the inductive switch 11 can be perpendicular to the right end of the handle 5 in the initial state. The inductive switch 11 can be fixed to the top left side of the air outlet pipe 4 by screwing or clamping. The inductive switch 11 faces the handle 5 in the initial state.

[0070] Please refer to Figure 4 and Figure 5 When the handle 5 is turned counterclockwise to close the movable door 3 (the movable door 3 please refer to Figure 1 ) and when the handle 5 is no longer directly opposite the inductive switch 11, the inductive switch 11 will generate a trigger signal, and the generator 12 will stop generating combustible gas after receiving the trigger signal. The generator 12 is used to generate combustible gas. The generator 12 can be a hydrogen-oxygen generator, which is used to generate hydrogen-oxygen gas. The generator 12 can be a QH-BGG-0011 type hydrogen-oxygen generator produced by Huanhuang Environmental Protection Technology. The generator 12 can also be a gas source storing acetylene or propane. The generator 12 can be connected through a pipeline and the gas inlet pipe 2.

[0071] As shown in Figure 1 , optionally, the tempering prevention device that can automatically cut off gas also includes a check valve 13, which is arranged on the gas inlet pipe 2 and connected with the box body 1. The check valve 13 is in contact with the liquid, and when the gas pressure generated by tempering breaks the explosion-proof membrane 6, the gas pressure triggers the check valve 13 and makes it close. In this way, because the check valve 13 is directly in contact with the liquid, and the liquid is incompressible, once the liquid pressure increases due to the increase in gas pressure when tempering occurs, the check valve 13 can be directly triggered by the liquid pressure to close, and its response speed is faster. The check valve 13 can be a piezoelectric valve, and the trigger pressure of the check valve 13 can be equal to the breaking pressure of the explosion-proof membrane 6. The check valve 13 can be fixed to the bottom of the box body 1 by screwing, welding or riveting. The gas inlet pipe 2 can be connected with the check valve 13 by screwing.

[0072] Please refer to Figures 1 to 5 , the materials of the box body 1, the gas inlet pipe 2, the gas outlet pipe 4, the handle 5, the valve body 30 and the valve core 31 can be aluminum alloy or metal such as steel. When the combustible gas is normally cut, the combustible gas generated by the generator 12 enters the box body 1 from the gas inlet 10 through the gas inlet pipe 2. The combustible gas is filtered by the liquid in the box body 1 and flows out to the right from the gas outlet 40 for cutting.

[0073] Please refer to Figures 1 to 5 , when the combustible gas is tempered, the gas pressure generated by tempering flows into the gas outlet pipe 4 from right to left through the gas outlet 40. The part of the gas pressure flowing upward in the gas outlet pipe 4 breaks the explosion-proof membrane 6 and pushes the handle 5 to rotate counterclockwise. After the handle 5 rotates counterclockwise, the valve core 31 releases the locking of the spring 32, and the spring 32 pushes the valve core 31 to block the through hole 90 of the sealing gasket 9 to block the gas inlet pipe 2. When the handle 5 rotates, the inductive switch 11 is triggered and a trigger signal is generated, and the generator 12 stops supplying combustible gas to the gas inlet pipe 2 after receiving the trigger signal.

[0074] Please refer to Figures 1 to 5, the air pressure in the part of the outlet pipe 4 flowing downward will increase the pressure on the liquid, and the liquid under pressure can trigger the check valve 13 to close the check valve 13, preventing the liquid under pressure from flowing into the inlet pipe 2. That is, the inductive switch 11 and the handle 5 can achieve double insurance when preventing combustible gas from entering the liquid.

[0075] The fire-retardant ring, filter core, pressure switch and pressure transmitter in the dry automatic gas cut-off tempering prevention device are all vulnerable parts, and the unit prices are 240 yuan, 30 yuan, 400 yuan and 400 yuan respectively. The system needs to set 8 levels of tempering protection for a single hydrogen-oxygen cutting machine, and the consumption of vulnerable parts is very high for a single tempering. If the tempering is serious and causes the damage of a hydrogen-oxygen generator with a unit price of more than 40,000 yuan, the cost will be higher. In the automatic gas cut-off tempering prevention device in the embodiment, only the explosion-proof membrane 6 is a vulnerable part. When the explosion-proof membrane 6 is an aluminum sheet, the unit price of square purchase is 20 yuan / m 2 , and the consumption of vulnerable parts for a single tempering is extremely low.

[0076] The automatic gas cut-off tempering prevention device provided by the embodiment of the application is described in detail above. For those skilled in the art, according to the idea of the embodiment of the application, the specific implementation and application range will be changed. In conclusion, the content of the specification should not be understood as a limitation of the application. All equivalent modifications or changes made according to the spirit and technical idea of the application should still be covered by the claims of the application.

Claims

1. An automatic decarburization preventing device characterized by comprising: The application relates to a safety device for a gas stove, which comprises: a box body in which a liquid is arranged; an air inlet pipe connected with the box body, combustible gas in the air inlet pipe entering the box body after passing through the liquid; a movable door arranged on the air inlet pipe, the movable door being used for closing or opening the air inlet pipe; an air outlet pipe connected with the box body, the air outlet pipe comprising an air outlet and a pressure relief port, combustible gas in the box body flowing out of the box body through the air outlet; a handle pivoted with the movable door, the pressure relief port being directed towards the handle in an initial state; and an explosion-proof membrane arranged on the air outlet pipe and located between the air outlet and the pressure relief port, the explosion-proof membrane sealing and isolating the pressure relief port, when the air pressure generated by tempering breaks the explosion-proof membrane and pushes the handle through the pressure relief port, the handle closing the movable door. The safety device further comprises a protective cover, the protective cover being arranged on the pressure relief port and connected with the air outlet pipe.

2. The self-ventable temper proof device of claim 1, wherein The air inlet pipe is connected with the bottom of the box body.

3. The self-ventable temper proof device of claim 1, wherein The movable door comprises a valve body, a spring and a valve core, the valve body being connected with the air inlet pipe, the valve core being inserted into the valve body and being slidably connected with the valve body, the valve core locking the spring on the valve body, the valve core being pivoted with the handle, the handle abutting against the valve body, when the air pressure generated by tempering breaks the explosion-proof membrane and pushes the handle through the pressure relief port, the handle releasing the locking of the spring by the valve core, the spring pushing the valve core to block the air inlet pipe.

4. The self-ventigating temper preventing device of claim 1, wherein The valve core comprises a stopper and a push rod, the stopper being connected with the push rod, the push rod being pivoted with the handle, the spring being sleeved on the push rod, two ends of the spring abutting against the valve body and the stopper respectively, when the air pressure generated by tempering breaks the explosion-proof membrane and pushes the handle through the pressure relief port, the handle releasing the locking of the spring by the stopper, the spring pushing the stopper to block the air inlet pipe.

5. The self-ventigating temper preventing device of claim 4, wherein, The length direction of the valve core and the length direction of the air inlet pipe are arranged in parallel with each other, and the length direction of the valve core and the length direction of the handle in the initial state are arranged in perpendicular with each other.

6. The self-ventigating temper preventing device of claim 4, wherein The length direction of the air outlet pipe and the length direction of the handle in the initial state are arranged in perpendicular with each other.

7. The self-ventigating temper preventing device of claim 4, wherein The safety device further comprises an air inlet, the air inlet being communicated with the movable door.

8. The self-ventigating temper preventing device of claim 1, wherein, The safety device further comprises an inductive switch and a generator, the inductive switch being electrically connected with the generator, the generator being connected with the air inlet pipe, when the handle closes the movable door, the inductive switch is triggered by the handle and generates a trigger signal, and the generator stops generating combustible gas based on the trigger signal.

9. The self-ventigating temper preventing device of claim 1, wherein, ​

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