A combustion device and method with dynamic backfire prevention and anti-tilt combustion functions

Abstract

The present invention discloses a combustion device and method with dynamic anti-backfire and anti-tilt combustion functions; it relates to the technical field of combustion appliances for anti-backfire and anti-tilt combustion, and includes a first burner. A plurality of second burners are provided at the upper end of the first burner, a pipeline assembly is provided at the lower end of the first burner, and a heat storage assembly and a detection assembly are provided at the upper end of the first burner; through the cooperation of the superposition of the first burner and the second burner, it is convenient to solve the backfire caused by the influence of fuel flow rate or concentration under normal combustion conditions, so as to achieve a relatively stable state of combustion; through the cooperation of the gas-gathering pipeline and the first pipeline, it is convenient to achieve uniform distribution during the fuel transportation process; through the cooperation of the motor and the regulating valve body, it is convenient to dynamically control the flow rate and velocity of the combustion gas; this device solves the backfire caused by the influence of fuel flow rate or concentration under normal combustion conditions, realizes the uniform distribution during the fuel transportation process, and to a certain extent prevents the occurrence of the tilt combustion state.

Description

Technical Field

[0001] The present invention relates to the technical field of combustion appliances for preventing backfire and tilting combustion, and particularly to a combustion device and method with dynamic backfire prevention and tilting combustion prevention functions. Background Art

[0002] A burner is a general term for a device that sprays and mixes fuel and air for combustion; the new technology of porous medium combustion has the advantages of high combustion efficiency and low pollutant emissions. At the same time, it also has the advantages of a small burner volume, a compact structure, a wide load adjustment range, and stable combustion; introducing the porous medium combustion technology into the combustion system will accelerate the combustion rate, enhance the flame stability, and improve the combustion efficiency; porous medium burners are mainly divided into two types: unidirectional flow and reciprocating flow. In China, porous medium burners can also be divided into single-layer and double-layer. When the velocity of the mixture of gas and air entering the furnace from the burner is less than the flame propagation velocity, backfire will occur; controlling the gas velocity and pressure during the combustion process can effectively prevent the burner from having a backfire accident; tilting combustion refers to the occurrence of a small disturbance during the porous medium combustion process, where the flame front propagation direction is the same as the gas flow direction, resulting in a tilting combustion phenomenon. The cross-section of the combustion wave gradually evolves from a circular cross-section to an elliptical cross-section. As the tilting combustion phenomenon continues to develop, the combustion flame front will show attenuation or fragmentation; currently, porous medium burners have problems such as tilting combustion, backfire, and flashback of the flame; therefore, it is necessary to make improvements according to the above problems. Summary of the Invention

[0003] The purpose of the present invention is to solve the disadvantages existing in the prior art, and to propose a combustion device and method with dynamic backfire prevention and tilting combustion prevention functions.

[0004] To achieve the above purpose, the present invention adopts the following technical solution: A combustion device with dynamic backfire prevention and tilting combustion prevention functions, including a first burner, multiple second burners are provided at the upper end of the first burner, and the first burner and the second burners at the lower end are fixedly connected by fastening bolts around the circumference. Another first burner is fixedly connected to the top surface of the second burners at the upper end by fastening bolts. A pipe assembly is provided at the lower end of the first burner at the lower end. The combustion device includes a heat storage assembly and a detection assembly.

[0005] Preferably, the pipe assembly includes four equally spaced air guide ports starting from the bottom surface of the first burner. A gas collecting pipe is installed in the air guide ports. The lower end of the gas collecting pipe is fixedly connected to a first pipe. The lower end of the first pipe is provided with an adjusting valve body, and one end of the adjusting valve body at the same end is connected to a motor.

[0006] Preferably, a straight pipe is fixedly connected to the lower end of the regulating valve body, three pipes are fixedly connected to the lower end of the straight pipe, a sealing plate is fixedly connected to the lower end of the three pipes, and a curved pipe is fixedly connected to the other end of the three pipes at one end, the curved pipe and the other end of the three pipes at the other end are fixedly connected to a second pipe, and the other end of the second pipe is fixedly connected to a gas pipeline.

[0007] Preferably, the heat storage assembly includes a first porous plate and a second porous plate, the first porous plate being horizontally installed at the connection between the first burner and the second burner and at the connection between the second burner and the second burner, and the second porous plate being horizontally installed at the middle of the inner side of the first burner and the second burner.

[0008] Preferably, the inner circumference of the first burner and the second burner is provided with rock wool, glass wool and expanded vermiculite in sequence from the inside to the outside, and a temperature sensor is installed inside the first burner at the lower end, and the detection rod of the temperature sensor is placed in the middle of the first burner at the lower end.

[0009] Preferably, the detection assembly includes a connecting tube installed on the inner bottom surface of the lower first burner, the connecting tube is placed directly above the gas gathering pipe, and a fixing seat is connected to the outer side of the lower end of the connecting tube, and the fixing seat is installed on the inner bottom surface of the lower first burner by bolts.

[0010] Preferably, a plurality of equidistant ventilation holes are provided on the outer side of the connecting tube, and an internally threaded pipe is provided in the middle of the top surface of the connecting tube, the internal thread of the internally threaded pipe is connected to a first connecting seat, a positioning plate is abutted on the top surface of the first connecting seat, a thermal fuse is connected to the bottom surface of the positioning plate, and a second connecting seat is fixedly connected to the lower end of the thermal fuse.

[0011] Preferably, a connecting plate is horizontally provided inside the connecting tube, an internal thread groove is provided in the middle of the top surface of the connecting plate, and the second connecting seat is threadedly connected to the connecting plate.

[0012] Preferably, a stopper is fixedly connected to the middle part of the bottom surface of the connecting plate, and the stopper cooperates with the upper end of the inner part of the gas gathering pipe. A spring is vertically provided between the connecting plate and the inner top surface of the connecting tube, and the upper end of the spring is fixedly connected to the middle part of the inner top surface of the connecting tube, and the lower end of the spring is fixedly connected to the middle part of the top surface of the connecting plate.

[0013] An operating method of a combustion device with dynamic anti-flashback and anti-tilt combustion functions comprises the following steps:

[0014] S1. First, connect the motor wires and power it on. Then, introduce gas into the gas transmission pipeline. The gas transmission pipeline is connected to four second pipelines, so as to supply gas to two bent pipelines and two three - pipelines at one end respectively. Then, supply gas to the three - pipelines at the other end through the two bent pipelines, and further supply gas to the four straight pipelines. When the gas reaches the regulating valve body, start the motor. Open the regulating valve body through the motor to make the gas flow rates in the four first pipelines consistent. Finally, the gas enters the first burner at the lower end through the four gas - collecting pipelines, thus avoiding the inclination of the first burner and the second burner caused by uneven heating of the gas in the first burner and the second burner.

[0015] S2. When introducing gas into the first burner at the lower end, the gas will first touch the baffle inside the first burner to disperse the gas coming out of each gas - collecting pipeline, so that the gas burns fully. When the gas moves upward, it will touch the first perforated plate and the second perforated plate respectively. The gas will come out from the holes in the first perforated plate and the second perforated plate, so that the gas is dispersed more, and further the gas burns more fully.

[0016] S3. When igniting the gas, if the burning speed of the gas is greater than the gas output speed, backfire may occur inside the first burner and the second burner, and even the flame may enter the gas - collecting pipeline, the first pipeline, the straight pipeline, the three - pipeline, the bent pipeline and the gas transmission pipeline, resulting in an explosion. When backfire occurs, the flame first burns from the first burner at the upper end to the first burner at the lower end. At this time, the temperature of the first burner at the lower end gradually rises. Detect the temperature inside the first burner at the lower end through the temperature sensor. When the temperature exceeds a certain range, the controller will control the motor to start, thus rotating the regulating valve body, and further controlling the gas transmission speed to avoid backfire.

[0017] S4. When there is a power failure, although the temperature sensor detects the temperature, the controller cannot control the motor to rotate. When the temperature in the first burner at the lower end is too high when the flame continues to burn downward, the heat - melting wire inside the connecting cylinder will be melted. The connecting plate is pushed downward by the spring, and then the baffle is inserted into the gas - collecting pipeline to cut off the gas introduction, thus avoiding the flame from entering the gas transmission pipeline and further avoiding the occurrence of an explosion.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: Through the cooperation of the first burner and the second burner in superposition, it is convenient to solve the flashback problem caused by the influence of fuel flow rate or concentration in the normal combustion situation, so as to achieve a relatively stable combustion state and prevent flashback; through the cooperation of the gas-gathering pipe and the first pipe, it is convenient to achieve uniform distribution during the fuel transportation process and prevent the occurrence of inclined combustion state to a certain extent; through the cooperation of the motor and the regulating valve body, it is convenient to dynamically control the flow rate and velocity of the combustion gas to meet the requirements of preventing flashback and inclined combustion; through the cooperation of the heat-fusing wire and the spring, when the motor fails to control the regulating valve body, the heat-fusing wire melts the spring to push the stopper into the gas-gathering pipe, thereby blocking the introduction of gas and achieving flashback prevention; this device solves the flashback problem caused by the influence of fuel flow rate or concentration in the normal combustion situation, realizes uniform distribution during the fuel transportation process, and prevents the occurrence of inclined combustion state to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention, form a part of this application, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation to the present invention. In the drawings:

[0020] Figure 1 is a schematic three-dimensional structure diagram of the whole of the present invention;

[0021] Figure 2 is a schematic side-sectional structure diagram of the whole of the present invention;

[0022] Figure 3 is a schematic front-sectional structure diagram of the whole of the present invention;

[0023] Figure 4 is a schematic sectional three-dimensional structure diagram of the whole of the present invention;

[0024] Figure 5 is a schematic three-dimensional structure diagram of the pipeline assembly of the present invention;

[0025] Figure 6 is a schematic three-dimensional structure diagram of the detection assembly of the present invention;

[0026] Figure 7 is a schematic sectional structure diagram of the detection assembly of the present invention;

[0027] Figure 8 of the present invention Figure 2 is an enlarged schematic diagram of the structure of part A;

[0028] Figure 9 of the present invention Figure 3 is an enlarged schematic diagram of the structure of part B.

[0029] Reference numerals in the figure: 1. First burner; 2. Second burner; 3. Fastening bolt; 4. Gas-gathering pipe; 5. First pipe; 6. Regulating valve body; 7. Motor; 8. Straight pipe; 9. Three-way pipe; 10. Bent pipe; 11. Gas transmission pipe; 12. First perforated plate; 13. Second perforated plate; 14. Rock wool; 15. Glass wool; 16. Expanded vermiculite; 17. Temperature sensor; 18. Connecting cylinder; 19. Fixed seat; 20. Vent hole; 21. First connecting seat; 22. Positioning plate; 23. Heat fusion wire; 24. Second connecting seat; 25. Connecting plate; 26. Stop block; 27. Spring. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0031] Embodiment 1: Refer to Figures 1-9 , a combustion device with dynamic anti-backfire and anti-tilting combustion functions in the present invention includes a first burner 1, which facilitates gas combustion and the installation of the second burner 2 through the first burner 1; a plurality of second burners 2 are provided at the upper end of the first burner 1, which facilitates combustion through the second burner 2; and the circumferences of the first burner 1 and the lower second burner 2 are fixedly connected by fastening bolts 3, and another first burner 1 is fixedly connected to the top surface of the upper second burner 2 by a fastening bolt 3. A pipeline assembly is provided at the lower end of the lower first burner 1. The combustion device includes a heat storage assembly and a detection assembly; the pipeline assembly includes four equally spaced air guide ports starting from the bottom surface of the first burner 1, and a gas-gathering pipe 4 is installed in the air guide ports, which facilitates gas-gathering combustion through the gas-gathering pipe 4; the lower end of the gas-gathering pipe 4 is fixedly connected to a first pipe 5, which facilitates connecting the regulating valve body 6 through the first pipe 5; the lower end of the first pipe 5 is the regulating valve body 6, which facilitates adjusting the gas flow rate through the regulating valve body 6; one end of the same-end regulating valve body 6 is connected to a motor 7, which facilitates driving the regulating valve body 6 through the motor 7; the lower end of the regulating valve body 6 is fixedly connected to a straight pipe 8, which facilitates connecting the three-way pipe 9 through the straight pipe 8; the lower end of the straight pipe 8 is fixedly connected to a three-way pipe 9, which facilitates connecting the bent pipe 10 through the three-way pipe 9; a sealing plate is fixedly connected to the lower end of the three-way pipe 9, and one end of the three-way pipe 9 is fixedly connected to the bent pipe 10 at the other end, which facilitates connecting the second pipe through the bent pipe 10; the bent pipe 10 and the other end of the three-way pipe 9 at the other end are fixedly connected to a second pipe, which facilitates connecting the gas transmission pipe 11 through the second pipe; the other end of the second pipe is fixedly connected to the gas transmission pipe 11, which facilitates gas transmission through the gas transmission pipe 11.

[0032] Embodiment 2: The technical solution is basically the same as that of Embodiment 1, except that, as Figure 2 、 Figure 3 、 Figure 4As shown in the figure, the heat storage component includes a first porous plate 12 and a second porous plate 13. The first porous plate 12 is horizontally installed at the connection between the first burner 1 and the second burner 2 and at the connection between the second burner 2 and the second burner 2 respectively. The second porous plate 13 is horizontally installed in the middle of the inner sides of the first burner 1 and the second burner 2 respectively. The first porous plate 12 and the second porous plate 13 facilitate the full combustion of gas. Rock wool 14, glass wool 15 and expanded vermiculite 16 are sequentially arranged from the inside to the outside on the inner circumferences of the first burner 1 and the second burner 2. The rock wool 14, glass wool 15 and expanded vermiculite 16 facilitate heat storage. A temperature sensor 17 is installed inside the lower end of the first burner 1. The temperature sensor 17 facilitates temperature detection. The model of the temperature sensor 17 is CYYZ11A. The detection rod of the temperature sensor 17 is placed in the middle of the lower end of the first burner 1. The detection component includes a connecting cylinder 18 installed on the inner bottom surface of the lower end of the first burner 1. The connecting cylinder 18 facilitates the installation of the heat melting wire 23. The connecting cylinder 18 is located directly above the gas collecting pipe 4. A fixing seat 19 is connected to the outer side of the lower end of the connecting cylinder 18. The fixing seat 19 facilitates the installation of the connecting cylinder 18. The fixing seat 19 is installed on the inner bottom surface of the lower end of the first burner 1 through bolts.

[0033] Embodiment 3: It is basically the same as the technical solution of Embodiment 1, except that, as Figure 6 , Figure 7 , Figure 8 shown, a plurality of equally spaced ventilation holes 20 are opened on the outer side of the connecting cylinder 18. The ventilation holes 20 facilitate the full combustion of gas. A threaded pipe is opened in the middle of the top surface of the connecting cylinder 18. A first connecting seat 21 is threadedly connected to the threaded pipe inside the threaded pipe. The first connecting seat 21 facilitates abutting against the positioning plate 22. The top surface of the first connecting seat 21 abuts against a positioning plate 22. The positioning plate 22 facilitates connecting the heat melting wire 23. The heat melting wire 23 is connected to the bottom surface of the positioning plate 22. The heat melting wire 23 facilitates pulling the connecting plate 25. The lower end of the heat melting wire 23 is fixedly connected to a second connecting seat 24. The second connecting seat 24 facilitates the connection between the heat melting wire 23 and the connecting plate 25. A connecting plate 25 is horizontally arranged inside the connecting cylinder 18. The connecting plate 25 facilitates pressing the spring 27 and installing the stop block 26. An internal threaded groove is opened in the middle of the top surface of the connecting plate 25. The second connecting seat 24 is threadedly connected to the connecting plate 25. A stop block 26 is fixedly connected to the middle of the bottom surface of the connecting plate 25. The stop block 26 facilitates blocking the gas collecting pipe 4. The stop block 26 cooperates with the upper end inside the gas collecting pipe 4. A spring 27 is vertically arranged between the connecting plate 25 and the inner top surface of the connecting cylinder 18. The spring 27 facilitates pushing the connecting plate 25. The upper end of the spring 27 is fixedly connected to the middle of the inner top surface of the connecting cylinder 18, and the lower end of the spring 27 is fixedly connected to the middle of the top surface of the connecting plate 25.

[0034] Working principle: In this embodiment, the present invention also proposes a use method of a combustion device and method with dynamic anti-backfire and anti-tilting combustion functions, including the following steps:

[0035] Step 1: First, connect the wires of the motor 7 and power it on. Then, introduce gas into the gas transmission pipeline 11. The gas transmission pipeline 11 is connected to four second pipelines, so as to respectively introduce gas into two curved pipelines 10 and three pipelines 9 at one end. Then, introduce gas into the three pipelines 9 at the other end through the two curved pipelines 10, and further introduce gas into four straight pipelines 8. When the gas reaches the regulating valve body 6, start the motor 7, and open the regulating valve body 6 through the motor 7 to make the gas flow rates in the four first pipelines 5 consistent. Finally, the gas enters the first burner 1 at the lower end from the four gas gathering pipelines 4, thereby avoiding the inclination of the first burner 1 and the second burner 2 caused by uneven heating of the gas in the first burner 1 and the second burner 2;

[0036] Step 2: When introducing gas into the first burner 1 at the lower end, the gas will first touch the baffle 26 inside the first burner 1 to disperse the gas coming out of each gas gathering pipeline 4, so that the gas burns fully. When the gas moves upward, it will respectively touch the first perforated plate 12 and the second perforated plate 13, and the gas will come out from the holes in the first perforated plate 12 and the second perforated plate 13, so that the gas is dispersed more, and further the gas burns more fully;

[0037] Step 3: When igniting the gas, if the burning speed of the gas is greater than the gas output speed, backfire may occur inside the first burner 1 and the second burner 2, and even the flame may enter the gas gathering pipeline 4, the first pipeline 5, the straight pipeline 8, the three pipeline 9, the curved pipeline 10 and the gas transmission pipeline 11, resulting in an explosion. When backfire occurs, the flame first burns from the first burner 1 at the upper end to the first burner 1 at the lower end. At this time, the temperature of the first burner 1 at the lower end gradually increases. The temperature sensor 17 monitors the temperature inside the first burner 1 at the lower end. When the temperature exceeds a certain range, the controller will control the motor 7 to start, so as to rotate the regulating valve body 6, and then control the gas transmission speed to avoid backfire;

[0038] Step 4: When there is a power failure, the temperature sensor 17 detects the temperature, but the controller cannot control the motor 7 to rotate. When the temperature in the first burner 1 at the lower end is too high when the flame continues to burn downward, the heat fuse 23 inside the connecting cylinder 18 will be melted, and the connecting plate 25 will be pushed downward by the spring 27, and then the baffle 26 will be inserted into the gas gathering pipeline 4 to cut off the introduction of gas, thereby avoiding the flame from entering the gas transmission pipeline 11 and further avoiding the occurrence of an explosion.

[0039] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A combustion device with dynamic anti-flashback and anti-tilt combustion functions, comprising a first burner, characterized in that: A plurality of second burners are arranged at the upper end of the first burner, and the first burner and the second burner at the lower end are fixedly connected around the circumference by fastening bolts, the top surface of the second burner at the upper end is fixedly connected to another first burner by fastening bolts, and a pipeline assembly is arranged at the lower end of the first burner at the lower end, and the combustion device includes a heat storage assembly and a detection assembly; The pipeline assembly includes four equidistant air guide ports provided on the bottom surface of the first burner, a gas collecting pipe is installed in the air guide port, a first pipe is fixedly connected to the lower end of the gas collecting pipe, a regulating valve body is provided at the lower end of the first pipe, and a motor is connected to one end of the regulating valve body at the same end; The heat storage assembly includes a first porous plate and a second porous plate, wherein the first porous plate is horizontally installed at the connection between the first burner and the second burner and at the connection between the second burner and the second burner, and the second porous plate is horizontally installed at the middle of the inner side of the first burner and the middle of the inner side of the second burner; The detection assembly includes a connecting tube installed on the inner bottom surface of the first burner at the lower end, the connecting tube is placed directly above the gas gathering pipe, and the outer side of the lower end of the connecting tube is connected to a fixing seat, and the fixing seat is installed on the inner bottom surface of the first burner at the lower end by bolts; The outer side of the connecting tube is provided with a plurality of equidistant vent holes, and the middle part of the top surface of the connecting tube is provided with an internal threaded pipe, the internal threaded pipe is internally threadedly connected to a first connecting seat, the top surface of the first connecting seat is abutted against a positioning plate, the bottom surface of the positioning plate is connected to a thermal fuse, and the lower end of the thermal fuse is fixedly connected to a second connecting seat; A temperature sensor is installed inside the first burner at the lower end; A connecting plate is horizontally arranged inside the connecting tube, an internal thread groove is opened in the middle of the top surface of the connecting plate, and the second connecting seat is threadedly connected to the connecting plate; A stopper is fixedly connected to the middle part of the bottom surface of the connecting plate, and the stopper cooperates with the upper end of the inner part of the gas gathering pipe. A spring is vertically arranged between the connecting plate and the inner top surface of the connecting tube. The upper end of the spring is fixedly connected to the middle part of the inner top surface of the connecting tube, and the lower end of the spring is fixedly connected to the middle part of the top surface of the connecting plate.

2. A combustion device with dynamic anti-flashback and anti-tilt combustion functions according to claim 1, characterized in that: A straight pipe is fixedly connected to the lower end of the regulating valve body, three pipes are fixedly connected to the lower end of the straight pipe, a sealing plate is fixedly connected to the lower end of the three pipes, and a curved pipe is fixedly connected to the other end of the three pipes at one end, a second pipe is fixedly connected to the other end of the curved pipe and the other end of the three pipes at the other end, and a gas transmission pipe is fixedly connected to the other end of the second pipe.

3. A combustion device with dynamic anti-flashback and anti-tilt combustion functions according to claim 1, characterized in that: The inner circumference of the first burner and the second burner is provided with rock wool, glass wool and expanded vermiculite in sequence from the inside to the outside, and the detection rod of the temperature sensor is placed in the middle of the first burner at the lower end.

4. The method for operating a combustion device with dynamic anti-flashback and anti-tilt combustion functions according to claim 2, characterized in that: The following steps are involved: S1, first connect the motor to the wire and energize it, then ventilate the gas pipeline, connect it to the four second pipelines through the gas pipeline, and then supply gas to the two curved pipelines and the two three-pipeline pipelines at one end respectively, and then supply gas to the three-pipeline pipeline at the other end through the two curved pipelines, and then supply gas to the four straight pipelines respectively. When the gas reaches the regulating valve body, start the motor, open the regulating valve body through the motor to make the gas flow rate in the four first pipelines consistent, and finally the gas enters the first burner at the lower end from the four gas gathering pipelines, so as to avoid the uneven heating of the gas in the first burner and the second burner causing the first burner and the second burner to tilt; S2, when the gas is introduced into the first burner at the lower end, the gas will first touch the block inside the first burner to disperse the gas coming out of each gas collecting pipe, so that the gas will be fully burned; when the gas moves upward, it will touch the first porous plate and the second porous plate respectively, and the gas will come out from the holes of the first porous plate and the second porous plate, so that the gas is more dispersed, and then the gas is burned more fully; S3, when igniting the gas, when the gas combustion speed is greater than the gas output speed, flashback will occur inside the first burner and the second burner, and even flames will appear inside the gas gathering pipe, the first pipe, the straight pipe, the third pipe, the curved pipe and the gas transmission pipe, thereby causing an explosion; when flashback occurs, the flame first burns from the first burner at the upper end to the first burner at the lower end. At this time, the temperature of the first burner at the lower end gradually increases. The temperature inside the first burner at the lower end is detected by the temperature sensor. When the temperature exceeds a certain range, the controller controls the motor to start, thereby rotating the regulating valve body, and then controlling the gas output speed to avoid flashback; S4, when the power is off, the temperature sensor detects the temperature, but the controller cannot control the motor to rotate. When the flame continues to burn downward, the temperature in the first burner at the lower end is too high, and the thermal fuse inside the connecting tube will be melted, and the connecting plate will be pushed downward by the spring, and then the block will be inserted into the gas gathering pipe to cut off the introduction of gas, thereby preventing the flame from entering the gas transmission pipe and avoiding the occurrence of explosion.

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