Intrinsically safe explosion-proof type extremely-early pyrolysis particle type fire detector

Abstract

The invention relates to the technical field of fire early warning, and discloses an intrinsically safe explosion-proof extremely-early pyrolysis particle type fire detector, which comprises a detection chamber, an air inlet pipeline and an exhaust pipeline which are fixedly communicated with the detection chamber, and a vortex tube fixedly mounted in the detection chamber, air exhaust equipment is fixedly mounted outside the detection chamber; a negative pressure machine is fixedly mounted on the exhaust pipeline; the vortex tube comprises a nozzle used for receiving input of external air, a hot air port used for spraying out hot air flow and a cold air port used for spraying out cold air flow. And the other end of the ventilation pipe penetrates out of the detection chamber and is fixedly communicated with air extraction equipment. The vortex tube is arranged in the detection chamber, and the vortex tube can generate hot air flow and cold air flow at the same time, so that cloud water drops are formed in the detection chamber; therefore, cloud water drops can be generated under the condition of ensuring that intrinsic safety type explosion-proof authentication is met, so that detection of pyrolysis particles is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of fire early warning, and in particular to an intrinsically safe explosion-proof very early pyrolytic particle fire detector. Background Art

[0002] The very early stage of a fire refers to the stage when combustible solids are overheated beyond the thermal collapse point, oxidized and burned, and begin to produce carbon smoke. Studies have shown that if early warning technology can provide early warning in the very early stages of material combustion, it can provide 4-12 hours of sufficient favorable time to control combustion conditions and prevent the situation from escalating. In the very early stages of a fire, due to heat, stable substances begin to enter an unstable decomposition state, thereby producing a large number of invisible sub-micron particles, namely "pyrolytic particles". Therefore, existing fire warning devices are all dedicated to detecting pyrolytic particles.

[0003] Existing very early fire detection devices generally include vacuum pumps, heating chambers, refrigeration chambers, laser detection chambers, exhaust solenoid valves, etc. Existing devices use vacuum pumps, heating chambers, refrigeration chambers or similar devices to generate cloud water droplets; for example, the Chinese utility model patent with document number CN221149438U, named a smart fire combining cloud chamber and laser technology, although this type of solution can realize the detection of pyrolytic particles, but because these devices are electrical equipment, according to the requirements of intrinsic safety explosion-proof certification, the voltage and current of the product during normal operation should be strictly limited to a certain range to ensure that the spark energy generated by the product during normal and fault conditions is insufficient to ignite the explosive mixture; in addition, the capacitance and inductance parameters in the circuit should also be limited to a certain range to prevent them from storing too much energy and releasing it in the event of a fault; the inductance and current values ​​of devices such as vacuum pumps, heating chambers, refrigeration chambers, laser detection chambers, exhaust solenoid valves, etc. exceed the required limits of intrinsic safety explosion-proof certification, so it is necessary to redesign a new detector with high safety performance; Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide an intrinsically safe explosion-proof very early pyrolytic particle fire detector, which forms mist and water droplets in the detection chamber by arranging a vortex tube in the detection chamber and utilizing the function of the vortex tube to simultaneously generate hot air flow and cold air flow; therefore, mist and water droplets can be generated while ensuring compliance with intrinsically safe explosion-proof certification, thereby realizing the detection of pyrolytic particles.

[0005] To achieve the above object, the present invention adopts the following technical scheme: an intrinsically safe explosion-proof very early pyrolytic particle fire detector, comprising a detection chamber, an air intake duct and an exhaust duct fixedly connected to the detection chamber, and a vortex tube fixedly installed inside the detection chamber; A detection platform is installed inside the detection chamber, and the vortex tube is fixed on the detection platform through a bracket; an exhaust device is fixedly installed outside the detection chamber; and a negative pressure machine is fixedly installed on the exhaust pipe; The vortex tube includes a nozzle for receiving external gas input, a hot air port for ejecting a hot air flow, and a cold air port for ejecting a cold air flow; the nozzle is fixedly connected to one end of the ventilation pipe, and the other end of the ventilation pipe passes through the detection room and is fixedly connected to the exhaust equipment.

[0006] Furthermore, an air inlet end of the air inlet pipe extends into the detection space, and the air inlet pipe is located in a section of the detection space and is connected to a plurality of branch pipes.

[0007] Furthermore, a laser detection cavity and a photoelectric conversion chip are provided in the detection chamber; a filter circuit and an amplifier circuit are connected to the photoelectric conversion chip outside the detection chamber, and the electric pulse signal converted by the photoelectric conversion chip is connected to the host computer after passing through the filter circuit and the amplifier circuit. The host computer removes the noise signal of the electric pulse signal and performs data processing according to the Miller algorithm, so as to measure the number of pyrolytic particles; then the host computer compares the number of pyrolytic particles with the preset alarm value. If the concentration of the pyrolytic particles reaches the preset value, the host computer simultaneously controls the alarm system and the fire extinguishing execution system.

[0008] Furthermore, a pipeline opening and closing device is installed inside the detection chamber; the pipeline opening and closing device includes a reciprocating drive structure fixed to the inner wall of the detection chamber, two sets of transmission structures with the same structure respectively connected to the two ends of the reciprocating drive structure, and two closing plates respectively connected to the two transmission structures; an air suction fan is arranged inside the air intake pipe, and when the closing plate corresponding to the air intake pipe falls, the closing plate corresponding to the exhaust pipe is lifted.

[0009] Furthermore, the reciprocating drive structure includes a motor fixed outside the detection chamber and a fixed box fixedly installed on the top wall inside the detection chamber; a movable frame is arranged inside the fixed box along the left and right directions, the output end of the motor is fixedly connected to the input shaft, the end of the input shaft is fixedly installed with a gear, and the movable frame is provided with meshing teeth meshing with the gear along the left and right directions.

[0010] Furthermore, each group of the transmission structure includes a connecting piece fixedly connected to the end of the movable frame; the end of the connecting piece is rotatably connected to a movable connecting rod, the bottom of the movable connecting rod is rotatably connected to the top of the fixed connecting rod, and the fixed connecting rod is vertically arranged and the bottom is fixedly connected to the top of the closing plate.

[0011] Furthermore, a closing frame is fixedly installed on the end surface of the air inlet pipe and the end surface of the exhaust pipe, an elastic sealing pad is fixedly provided on the inner wall of the closing frame close to the corresponding pipe, and the closing plate is plugged into the closing frame.

[0012] Furthermore, at least one group of limiting members is arranged on the top of the closing frame along the front-to-back direction, and each group of limiting members includes two limiting plates respectively located on the left and right sides of the closing plate, and the limiting plates are elastic.

[0013] Furthermore, a spherical groove is provided on one side of the closing plate away from the elastic sealing pad, a rotatable ball is confined in the spherical groove, and the ball is rollingly connected to the inner wall of the closing frame.

[0014] Furthermore, the connecting member includes an electric push rod, the telescopic end of the electric push rod is fixedly connected to a fixed block, and the fixed block is rotatably connected to the top of the movable connecting rod.

[0015] The beneficial effects of the present invention are: 1. By arranging a vortex tube in the detection room, the function of the vortex tube to simultaneously generate hot air flow and cold air flow is utilized to form cloud mist and water droplets in the detection room; the vortex tube is a purely mechanical mechanism and does not involve electrical equipment. Therefore, it can generate cloud mist and water droplets while ensuring compliance with intrinsic safety explosion-proof certification, thereby realizing the detection of pyrolysis particles; the existing detector uses an air compressor to do work on the gas and then cools and heats the gas separately to form mist, which has the disadvantages of high energy consumption and low efficiency; in addition, compared with the traditional cloud mist and water droplet generating device, the vortex tube has a simple structure and no mechanical moving parts, so the maintenance cost is low, and the vortex tube can conveniently adjust the output ratio and temperature range of hot and cold gases to meet different application requirements.

[0016] 2. Since the occurrence of fire is not a normal situation, if the exhaust equipment is started for a long time to send gas to the vortex tube to produce cloud and mist droplets, the energy consumption is relatively large. In addition, the negative pressure machine is generally in working state to replace the indoor air. At this time, the cold and hot air flow or cloud and mist droplets ejected by the vortex tube are easily sent out by the negative pressure machine. In this way, even if there are pyrolytic particles, it will affect the detection effect and cause misjudgment. Therefore, it is necessary to create a relatively closed detection environment for at least a short period of time to detect the gas drawn from the detection space, which can improve the accuracy of pyrolytic particle concentration detection. In addition, the intermittent generation of cloud and mist droplets makes the exhaust equipment work intermittently, which can reduce energy consumption. According to different locations and situations, the detection interval time can be adjusted, that is, the interval time of each generation of cloud and mist droplets can be adjusted; the generation of one cloud and mist droplets refers to the total amount of cloud and mist droplets that need to be generated when detecting the gas filling a detection room. . BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the overall principle diagram of the detection system; Figure 2 This is a schematic diagram of the external structure of the detection room; Figure 3This is a schematic diagram of the internal structure of the detection chamber; Figure 4 It is a schematic diagram of the structure of the air pump; Figure 5 It is a schematic diagram of the reciprocating drive structure; Figure 6 It is a schematic diagram of a closed structure; Figure 7 This is a schematic diagram of the disassembled structure of the closed plate; Figure 8 Schematic diagram of the vortex tube structure; Fig. 9 This is a block diagram of the principle of using a vortex tube to generate cloud water droplets in this application.

[0018] In the figure: 1. detection chamber; 2. air intake duct; 3. exhaust duct; 4. vacuum fan; 5. detection platform; 6. vortex tube; 601. nozzle; 602. hot air port; 603. cold air port; 7. ventilation pipe; 8. vacuum equipment; 9. motor; 10. input shaft; 11. fixed box; 12. movable frame; 13. meshing teeth; 14. gear; 15. electric push rod; 16. fixed block; 17. movable connecting rod; 18. fixed connecting rod; 19. closing frame; 20. elastic sealing pad; 21. limit plate; 22. closing plate; 23. ball; 24. negative pressure machine. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention are described clearly and completely below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0020] The directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", "top" and "bottom", are only for reference to the orientation of the drawings. The directional terms used are used to illustrate and understand the present invention, but not to limit the present invention.

[0021] Example: like Figure 1-Figure 9 As shown, an intrinsically safe explosion-proof very early pyrolytic particle fire detector comprises a detection chamber 1 installed indoors or outdoors, an air intake duct 2 and an exhaust duct 3 fixedly connected to the detection chamber 1, and a vortex tube 6 fixedly installed inside the detection chamber 1; A detection platform 5 is installed inside the detection chamber 1, and a vortex tube 6 is fixed on the detection platform 5 through a bracket; an exhaust device 8 is fixedly installed outside the detection chamber 1, and the exhaust device 8 can be an air pump or an air compressor, etc.; a negative pressure machine 24 is fixedly installed on the exhaust pipe 3; The vortex tube 6 includes a nozzle 601 for receiving external gas input, a hot air port 602 for ejecting a hot air flow, and a cold air port 603 for ejecting a cold air flow; the nozzle 601 is fixedly connected to one end of the ventilation pipe 7, and the other end of the ventilation pipe 7 passes through the detection chamber 1 and is fixedly connected to the exhaust device 8.

[0022] The outlet end of the air intake pipe 2 and the air intake end of the exhaust pipe 3 are both inserted into the detection chamber 1; the air intake end of the air intake pipe 2 extends into the detection space, and the air intake pipe 2 is located in a section of the detection space and connected to several branch pipes. The branch pipes can extend into multiple places in the same space to improve detection efficiency and detection accuracy.

[0023] The detection chamber 1 is provided with a laser detection cavity and a photoelectric conversion chip. The water mist formed by the pyrolytic particles is refracted by the laser detection cavity, and the refracted light is converted into a weak photoelectric pulse signal of corresponding amplitude by the photoelectric conversion chip. The outside of the detection chamber 1 is connected to a filter circuit and an amplifier circuit with the photoelectric conversion chip. The electric pulse signal converted by the photoelectric conversion chip is connected to the host computer after passing through the filter circuit and the amplifier circuit. The host computer removes the noise signal of the electric pulse signal and processes the data according to the Miller algorithm, so that the number of pyrolytic particles can be measured. Then the host computer compares the number of pyrolytic particles with the preset alarm value. If the concentration of the pyrolytic particles reaches 0.02% obs / m, the host computer controls the alarm system and the fire extinguishing execution system at the same time.

[0024] The specific working process of the vortex tube 6 is as follows: S1. Use the air extraction device 8 to input air into the nozzle 601 of the vortex tube, which is spiral in shape, and then inject it into the vortex chamber from the tangential direction to form a strong free vortex. The rotational angular velocity of the gas gradually increases as it approaches the center; S2. Due to the difference in angular velocity, friction will occur between the layers of the vortex. This friction causes the airflow in the center to lose energy, reduce its speed, and drop its temperature, thereby forming a cold airflow that is discharged from one end of the cold air port 603. S3, the outer airflow gains momentum, the kinetic energy increases, and rubs against the tube wall, converting part of the kinetic energy into heat energy. There is a conical nozzle in the tube to form a hot air flow, which is discharged from the other end of the vortex tube hot air port 602; S4. At the same time, a part of the airflow flows out through the control valve (hot end regulating valve), and the remaining gas is blocked and rotates in the opposite direction at the same speed in the inner circle of the original airflow, and flows to the cold air port of the vortex tube; S5, then, the hot air ejected is passed into the upper end of the cloud chamber, and the cold air ejected is passed into the lower end of the cloud chamber, and when the hot and cold gases meet, cloud water droplets can be formed; S6. Subsequently, the water mist formed by the pyrolysis particles is refracted by the laser detection cavity, and the refracted light is converted into a weak photoelectric pulse signal of corresponding amplitude by the photoelectric conversion chip; S7. The weak electric pulse signal is then filtered and amplified, and after the noise signal is removed, data processing is performed according to the Miller algorithm, so that the number of pyrolysis particles can be measured.

[0025] By adopting the above technical solution, the new atomization device can be used to quickly detect pyrolytic particles in the very early stage of a fire, thereby providing an early warning of the fire. According to the intrinsic safety and explosion-proof certification requirements, the voltage and current of the product during normal operation should be strictly limited to a certain range to ensure that the spark energy generated by the product during normal and faulty conditions is not enough to ignite the explosive mixture; in addition, the capacitance and inductance parameters in the circuit should also be limited to a certain range to prevent them from storing too much energy and releasing it during a fault. Intrinsic safety and explosion-proof standards usually require that equipment have a high degree of safety performance when used in hazardous locations. This includes the equipment itself should not generate electric sparks, release explosive gases or vapors, and other factors that may cause explosions.

[0026] The vortex tube 6 is a purely mechanical structure with no electrical equipment inside, so no electric sparks will be generated during operation, which is one of the key factors to avoid explosion. The working fluid of the vortex tube is air, and the state and chemical composition of the air will not change during operation, so no explosive gas or steam will be released. In addition, the vortex tube has a simple structure, light weight, low price, and is easy to maintain and operate. These characteristics make the vortex tube safer and more reliable when used in hazardous areas. In summary, the vortex tube fully meets the requirements of the intrinsic safety explosion-proof standard due to its unique working principle and significant safety performance characteristics. In equipment that requires explosion-proof performance, the vortex tube is an ideal choice.

[0027] A pipeline opening and closing device is installed inside the detection chamber 1; the pipeline opening and closing device includes a reciprocating drive structure fixed to the inner wall of the detection chamber 1, two sets of transmission structures respectively connected to the two ends of the reciprocating drive structure and having the same structure, and two closing plates 22 respectively connected to the two transmission structures and corresponding to the air intake pipe 2 and the exhaust pipe 3; an air pump 4 is arranged inside the air intake pipe 2, when the closing plate 22 corresponding to the air intake pipe 2 falls and safely closes the air outlet end of the air intake pipe 2, the closing plate 22 corresponding to the exhaust pipe 3 is lifted and the air intake end is completely exposed, so that the two pipes cannot be closed at the same time or cannot be connected to the inside of the detection chamber 1 at the same time; Figure 3 Left and right directions are shown.

[0028] The reciprocating drive structure includes a motor 9 fixed to the outside of the detection chamber 1 and a fixed box 11 fixedly installed on the top wall inside the detection chamber 1; the fixed box 11 is opened left and right, and a movable frame 12 is arranged inside the fixed box 11 along the left and right directions. The output end of the motor 9 is fixedly connected to an input shaft 10, and the input shaft 10 passes through the top of the detection chamber 1 and the top of the fixed box 11. A gear 14 is fixedly installed at the end of the input shaft 10. Meshing teeth 13 meshing with the gear 14 are arranged inside the movable frame 12 along the left and right directions. The movable frame 12 moves left and right under the action of the rotation of the gear 14, and the bottom surface of the movable frame 12 slides on the bottom surface inside the fixed box 11. The fixed box 11 provides support and protection for the movable frame 12.

[0029] Each transmission structure includes a connecting piece fixedly connected to the end of the movable frame 12; the end of the connecting piece is rotatably connected to a movable connecting rod 17, the bottom of the movable connecting rod 17 is rotatably connected to the top of the fixed connecting rod 18, and the fixed connecting rod 18 is vertically arranged and the bottom is fixedly connected to the top of the closing plate 22.

[0030] A closing frame 19 is fixedly installed on the end surface of the air intake duct 2 located inside the detection chamber 1 and the end surface of the exhaust duct 3 located inside the detection chamber 1. The closing frame 19 is a square frame with an open top. Except for the channels on the left and right side panels, other directions are closed. Its shape is the same as that of the air intake duct 2 and the exhaust duct 3. An elastic sealing gasket 20 is fixedly arranged on the inner wall of the closing frame 19 close to the corresponding pipe. The elastic sealing gasket 20 is also a square frame, and the closing plate 22 is plugged into the closing frame 19; the elastic sealing gasket 20 and the closing frame 19 are arranged to achieve a better sealing effect; the elastic sealing gasket 20 is made of silicone rubber, fluororubber, or nitrile rubber, and has good elasticity, wear resistance, sealing and a certain range of temperature resistance.

[0031] At least one set of limiting members is disposed on the top of the closing frame 19 along the front-to-back direction. Each set of limiting members includes two limiting plates 21 located at the left and right sides of the closing plate 22 respectively. The limiting plates 21 are elastic.

[0032] A spherical groove is provided on the side of the closing plate 22 away from the elastic sealing gasket 20, in which a rotatable ball 23 is restricted. The ball 23 is rollingly connected to the inner wall of the closing frame 19, and the ball 23 abuts against the closing frame 19. The provision of the ball 23 facilitates the closing plate 22 to move up and down in the closing frame 19, thereby reducing friction.

[0033] The connecting part includes an electric push rod 15, the telescopic end of the electric push rod 15 is fixedly connected to a fixed block 16, and the fixed block 16 is rotatably connected to the top of the movable connecting rod 17; when the closing plate 22 at one end is fully inserted into the corresponding closing frame 19, the movable connecting rod 17 at this end is vertical or basically vertical, and the inclination angle is very small; the movable connecting rod 17 at the other end is inclined, and the inclination angle is relatively large.

[0034] There are basically two working states. No matter which state, the bottom of the closing plate 22 does not exceed the top of the limit plate 21. In the first state, the starting motor 19 drives the gear 14, and the gear 14 drives the movable frame 12 to move toward the exhaust duct 3 through the meshing teeth 15, that is, the movable frame 12 moves to the right to drive the corresponding electric push rod 15 to move to the right, so that the movable connection 17 changes from an inclined state to a vertical state. In this process, the movable connecting rod 18 moves vertically downward until the right closing plate 22 completely falls into the closing frame 19 and the exhaust duct 3 is closed. At this time, the exhaust device 8 supplies gas to the vortex tube 6, and the hot air port 602 and the cold air port 6 of the vortex tube 6 are connected. 603 sprays out hot air and cold air respectively, and the hot air and cold air interact with each other in the detection room 1 to form clouds and water droplets. At the same time, the vacuum pump 4 draws the gas in the detection space into the detection room 1 to combine with the clouds and water droplets, which are captured and irradiated by the laser detection cavity, and the information is further transmitted to the host computer for analysis through the photoelectric conversion chip; after the analysis is completed, if it is determined that there is no fire, the motor 9 is started to move the movable frame 12 to the left. After the above-mentioned moving process, the closing plate 22 corresponding to the exhaust duct 3 is pulled up, and the closing plate 22 corresponding to the intake duct 2 is dropped; if it is determined that a fire has occurred, an alarm is triggered and the fire is extinguished, and at the same time, the negative pressure machine 24 is started to extract the gas in the detection room 1.

[0035] The second state: if you consider that the air intake duct 2 and the exhaust duct 3 are always connected, you can choose it in the fire extinguishing or normal state. Start the electric push rod 15 to pull the left movable link 17 to the right to pull up the left closing plate 22; pull the right movable link 17 to the left to pull up the right closing plate 22.

[0036] The above description is only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. An intrinsically safe explosion-proof very early pyrolytic particle fire detector, characterized in that: It comprises a detection chamber (1), an air intake duct (2) and an air exhaust duct (3) fixedly connected to the detection chamber (1), and a vortex tube (6) fixedly installed inside the detection chamber (1); A detection platform (5) is installed inside the detection chamber (1), and the vortex tube (6) is fixed on the detection platform (5) via a bracket; an exhaust device (8) is fixedly installed outside the detection chamber (1); and a negative pressure machine (24) is fixedly installed on the exhaust pipe (3); The vortex tube (6) comprises a nozzle (601) for receiving external gas input, a hot air port (602) for ejecting a hot air flow, and a cold air port (603) for ejecting a cold air flow; the nozzle (601) is fixedly connected to one end of the ventilation pipe (7), and the other end of the ventilation pipe (7) passes through the detection chamber (1) and is fixedly connected to the exhaust device (8).

2. The intrinsically safe explosion-proof very early pyrolytic particle fire detector according to claim 1, characterized in that: The air inlet end of the air inlet pipeline (2) extends into the detection space, and the air inlet pipeline (2) is located in a section of the detection space and is connected to a plurality of branch pipelines.

3. The intrinsically safe explosion-proof very early pyrolytic particle fire detector according to claim 1, characterized in that: The detection chamber (1) is provided with a laser detection cavity and a photoelectric conversion chip; the detection chamber (1) is externally connected to a filter circuit and an amplifier circuit connected to the photoelectric conversion chip; the electric pulse signal converted by the photoelectric conversion chip is connected to a host computer after passing through the filter circuit and the amplifier circuit; the host computer removes noise signals from the electric pulse signal and performs data processing according to the Miller algorithm, thereby measuring the number of pyrolytic particles; the host computer then compares the number of pyrolytic particles with a preset alarm value; if the concentration of the pyrolytic particles reaches the preset value, the host computer simultaneously controls the alarm system and the fire extinguishing execution system to operate.

4. The intrinsically safe explosion-proof very early pyrolytic particle fire detector according to claim 1, characterized in that: A pipeline opening and closing device is installed inside the detection chamber (1); the pipeline opening and closing device comprises a reciprocating drive structure fixed to the inner wall of the detection chamber (1), two sets of transmission structures respectively connected to the two ends of the reciprocating drive structure and having the same structure, and two closing plates (22) respectively connected to the two transmission structures; an air exhauster (4) is arranged inside the air intake pipe (2), and when the closing plate (22) corresponding to the air intake pipe (2) falls, the closing plate (22) corresponding to the exhaust pipe (3) is lifted.

5. The intrinsically safe explosion-proof very early pyrolytic particle fire detector according to claim 4, characterized in that: The reciprocating drive structure comprises a motor (9) fixed to the outside of the detection chamber (1) and a fixed box (11) fixedly mounted on the top wall of the detection chamber (1); a movable frame (12) is arranged inside the fixed box (11) along the left-right direction, an input shaft (10) is fixedly connected to the output end of the motor (9), a gear (14) is fixedly mounted at the end of the input shaft (10), and meshing teeth (13) meshing with the gear (14) are arranged inside the movable frame (12) along the left-right direction.

6. The intrinsically safe explosion-proof very early pyrolytic particle fire detector according to claim 5, characterized in that: Each group of the transmission structure comprises a connecting member fixedly connected to the end of the movable frame (12); the end of the connecting member is rotatably connected to a movable connecting rod (17), the bottom of the movable connecting rod (17) is rotatably connected to the top of a fixed connecting rod (18), and the fixed connecting rod (18) is vertically arranged and the bottom is fixedly connected to the top of the closing plate (22).

7. The intrinsically safe explosion-proof very early pyrolytic particle fire detector according to claim 4, characterized in that: A closing frame (19) is fixedly mounted on the end surface of the air intake pipe (2) and the end surface of the air exhaust pipe (3); an elastic sealing pad (20) is fixedly arranged on the inner wall of the closing frame (19) close to the corresponding pipe; and the closing plate (22) is plugged into the closing frame (19).

8. The intrinsically safe explosion-proof very early pyrolytic particle fire detector according to claim 7, characterized in that: At least one group of limiting members is arranged on the top of the closing frame (19) along the front-to-back direction, and each group of limiting members comprises two limiting plates (21) respectively located on the left and right sides of the closing plate (22), and the limiting plates (21) are elastic.

9. The intrinsically safe explosion-proof very early pyrolytic particle fire detector according to claim 7, characterized in that: A spherical groove is formed on a side of the closing plate (22) away from the elastic sealing pad (20), a rotatable ball (23) is confined in the spherical groove, and the ball (23) is rollingly connected to the inner wall of the closing frame (19).

10. The intrinsically safe explosion-proof very early pyrolytic particle fire detector according to claim 6, characterized in that: The connecting member comprises an electric push rod (15), the telescopic end of the electric push rod (15) is fixedly connected to a fixed block (16), and the fixed block (16) is rotatably connected to the top of the movable connecting rod (17).

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