Reverse pressure relief structure of cylindrical fire extinguisher

Abstract

A kind of anti-reverse pressure relief structure of cylindrical fire extinguisher, heat insulation pressure bearing plate is added between front head and net surface cartridge, waist hole shaped edge slot hole is set on the edge of heat insulation pressure bearing plate, for passing through starting heat sensitive wire, the distance between rubber plug pressure cap and heat insulation pressure bearing plate is greater than or equal to 3mm, the width of edge slot hole on heat insulation pressure bearing plate is slightly less than starting heat sensitive wire.This can ensure heat insulation distance, and as far as possible reduce the flow of high temperature and high pressure gas in cartridge cavity into front head inner cavity.If elastic sealing sheet is fixed on the end face of cartridge cavity side of heat insulation pressure bearing plate, elastic sealing sheet can fully block edge slot hole under the action of high pressure gas, so that high temperature and high pressure gas in cartridge cavity cannot enter front head inner cavity after the burning of medicine block, so that the anti-reverse pressure relief path of fire extinguisher can be completely eliminated, so as to realize the heat insulation and pressure maintaining effect on propelling cavity, and the pressure maintaining rightward propulsion of piston has direct effect.

Description

Technical Field

[0001] This utility model relates to the field of fire extinguisher inflation technology, specifically to a fire extinguisher with a function to prevent reverse pressure relief. Background Technology

[0002] Currently, in data centers, communication equipment rooms, and power equipment rooms, an increasing number of users are replacing dry powder fire extinguishing systems with gaseous fire extinguishing systems. Perfluorohexanone, as an important alternative to halon fire extinguishing agents, has attracted much attention due to its superior fire extinguishing effect and environmentally friendly characteristics. It is liquid at normal pressure, colorless and odorless, with low toxicity and good insulation properties. It evaporates rapidly, effectively absorbing heat and quickly reducing the temperature of the fire source, without causing secondary damage to electrical components, and has gained high market acceptance.

[0003] These fire extinguishers all feature a piston-type cylindrical structure. Perfluorohexanone (PFH) fire extinguishing devices are specifically designed for specific spaces such as data centers, communication equipment rooms, and power equipment rooms, combining the fire extinguishing advantages of PPH with the unique characteristics of a piston structure. This device rapidly detects the fire source using multiple methods, including smoke, heat, and flame detection, and uses a piston-driven mechanism to deliver the extinguishing agent directly to the ignition point, achieving precise fire suppression. The piston-type structure ensures efficient delivery of the extinguishing agent and stable operation under high pressure. Its slender and compact design makes it suitable for complex locations such as power equipment rooms, communication base stations, data centers, and new energy vehicles.

[0004] The existing piston-type perfluorohexanone fire extinguishing device includes a front end cap 1, a cylinder 2, a piston 3, a rear end cap 4, a mesh-surface extinguishing chamber 5, a gas-generating extinguishing block 6, a rubber stopper 7, a rubber stopper base 8, a rubber stopper cap 9, an activation heat-sensitive wire 10, an extinguishing agent chamber 11 for storing perfluorohexanone extinguishing agent, an activation heat-sensitive wire 12, a three-way air head 13, a nozzle membrane 14, a pressure membrane threaded connector 15, an elbow 16, and an atomizing nozzle 17. A heat-insulating pressure plate 18 is provided between the mesh-surface extinguishing chamber 5 and the front end cap 1. A central hole is provided on the heat-insulating pressure plate 18, through which the activation heat-sensitive wire 10 passes.

[0005] Its working principle is as follows: The ignition heat-sensitive wire 12 is arranged in the protected space within the three-way vent head 13. When the temperature rises or a fire breaks out on site, the ignition heat-sensitive wire 12 is ignited, which then transmits the ignition to the activation heat-sensitive wire 10, igniting the gas-generating block 6 and producing a large amount of high-pressure gas. This pushes the piston 3 to move to the right. The high-temperature and high-pressure gas in the high-pressure chamber exerts axial pressure on the piston 3, thereby pushing the perfluorohexanone in the extinguishing agent chamber 11 to pressurize the nozzle membrane 14. When the nozzle membrane 14 ruptures, the extinguishing agent passes through the elbow 16 under the continuous push of the piston 3 and is released from the atomizing nozzle 17.

[0006] In actual use, existing piston-type fire extinguishing devices exhibit reverse pressure relief after activation, resulting in the piston not being able to push all the way down, leading to a high residual rate. This directly affects the fire extinguishing efficiency of the fire extinguisher, especially at critical moments in fire extinguishing, which may result in incomplete fire suppression.

[0007] Observation and analysis revealed that upon activation, after the gas-generating block 6 is ignited, a large amount of high-pressure gas is generated within the extinguishing agent chamber 22. This high-temperature, high-pressure gas, along with sparks, is ejected from the central hole of the heat-insulating pressure plate 18, directly impacting the rubber stopper cap 9 and the rubber stopper 7. This causes the high-temperature gas to burn a channel through the perforation in the center of the rubber stopper 7. Consequently, the high-temperature, high-pressure gas in the extinguishing agent chamber 22 leaks backward through this burned channel in the center of the rubber stopper 7, causing the pressure in the high-pressure propulsion chamber 23 to drop below the expected value. Therefore, the internal pressure of the high-pressure propulsion chamber 23 cannot push the piston forward. This directly affects the propulsion speed of the extinguishing agent, resulting in an excessively high residual rate of the liquid extinguishing agent. Therefore, improvements to the existing product structure are necessary. Utility Model Content

[0008] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a structure for preventing reverse pressure relief in a columnar fire extinguisher.

[0009] The technical solution adopted is as follows: A structure for preventing reverse pressure relief in a columnar fire extinguisher includes a front end cap, cylinder, piston, rear end cap, mesh-surface explosive chamber, gas-generating explosive block, rubber stopper, rubber stopper base, rubber stopper cap, activation heat-sensitive wire, extinguishing agent cavity, initiation heat-sensitive wire, three-way air head, nozzle diaphragm, pressure diaphragm threaded joint, elbow, and atomizing nozzle. A heat-insulating pressure plate is added between the front end cap and the mesh-surface explosive chamber, and a side groove is provided at the edge of the heat-insulating pressure plate for the activation heat-sensitive wire to pass through.

[0010] Furthermore, the distance between the rubber stopper cap and the heat insulation pressure plate is greater than or equal to 3mm.

[0011] Furthermore, the width of the side slot holes on the heat-insulating pressure plate is slightly smaller than that of the starting thermal wire.

[0012] Furthermore, an elastic sealing sheet is fixed on one end face of the pneumatic chamber of the heat-insulating pressure plate. Under the action of the high-pressure gas in the pneumatic chamber, the elastic sealing sheet can completely block the side slot hole. In this way, when the gas-producing pneumatic block burns, the high-temperature and high-pressure gas generated in the pneumatic chamber cannot be directly sprayed onto the rubber stopper cap and the rubber stopper. This allows the perforation in the middle of the rubber stopper to close automatically due to its own elasticity. Although a small amount of high-temperature and high-pressure gas generated in the pneumatic chamber still enters the inner cavity of the front end cap through the side slot hole on the heat-insulating pressure plate, the temperature will be reduced by heat dissipation after detour and spatial expansion. During the entire fire extinguishing process, due to the short time, the high-temperature and high-pressure gas in the propulsion chamber plays a role in heat insulation and pressure maintenance under the action of the heat-insulating pressure plate with a specific structure. This eliminates the reverse pressure relief path between the fire extinguisher propulsion chamber and the inner cavity of the front end cap, ensuring the constant pressure propulsion of the piston by the high-temperature and high-pressure gas in the propulsion chamber. This has a direct impact on the uniform and continuous discharge and complete discharge of the extinguishing agent.

[0013] After the fire extinguisher is activated, the initiating heat-sensitive wire begins to burn, which then ignites the starting heat-sensitive wire, and finally detonates the gas-generating propellant. Because the through hole in the middle of the rubber stopper automatically closes due to its own elasticity after the starting heat-sensitive wire burns, a large amount of high-temperature and high-pressure gas is produced in the propulsion chamber due to the ignition of the gas-generating propellant, filling the propellant chamber and the propulsion chamber. Although some gas passes through the side slot holes on the heat-insulating pressure plate into the inner cavity of the front end cap, after being cooled by the heat dissipation of the front end cap and cylinder, the temperature of the gas in the inner cavity of the front end cap is much lower than the temperature in the propellant chamber during the short extinguishing period, and does not reach the temperature of the carbonization point of the rubber stopper. Therefore, it will not cause the rubber stopper to burn and form a pressure relief channel. The central through hole of the rubber stopper closes automatically due to its own elasticity. Therefore, the inner cavity of the front end cap can form a sealed cavity. With the continuous combustion of the gas-generating propellant, the high-temperature and high-pressure gas in the propulsion chamber can continuously push the piston to squeeze the extinguishing agent in the extinguishing agent cavity and spray it out. It can also move and push the piston to the limit point to complete the net release of the extinguishing agent.

[0014] The distance between the rubber stopper cap and the heat insulation pressure plate should be greater than or equal to 3mm to ensure the heat insulation distance. The width of the side groove hole on the heat insulation pressure plate should be slightly smaller than that of the starting thermal wire. This facilitates the clamping and limiting of the starting thermal wire and minimizes the flow of high-temperature and high-pressure gas in the medicine compartment into the inner cavity of the front end cap.

[0015] If an elastic sealing sheet is fixed on one end face of the pharmacy chamber of the heat-insulating pressure plate, the elastic sealing sheet can completely block the side slot hole under the action of high pressure gas. In this way, when the gas-producing pharmacy block burns, the high temperature and high pressure gas generated in the pharmacy chamber cannot enter the inner cavity of the front end cap. This can completely eliminate the path of reverse pressure relief of the fire extinguisher, thereby achieving the heat insulation and pressure-maintaining effect on the propulsion chamber, and has a direct effect on the pressure-maintaining and rightward propulsion of the piston. Attached Figure Description

[0016] Figure 1This is a structural diagram of an existing column-type fire extinguisher; Figure 2 This is a schematic diagram of the structure of this utility model; Figure 3 for Figure 2 A magnified view of the left end, including the piston section; Figure 4 This is a schematic diagram of a heat-insulating pressure-bearing plate. Figure 5 This is a schematic diagram of another structure of the heat-insulating pressure plate.

[0017] The numbers in the diagram are as follows: 1-Front end cap; 2-Cylinder body; 3-Piston; 4-Rear end cap; 5-Mesh propellant chamber; 6-Gas-generating propellant block; 7-Rubber stopper; 8-Rubber stopper base; 9-Rubber stopper cap; 10-Activation heat-sensitive wire; 11-Extinguishing agent cavity; 12-Activation heat-sensitive wire; 13-Three-way vent; 14-Nozzle membrane; 15-Pressure membrane threaded connector; 16-Elbow; 17-Atomizing nozzle; 18-Heat insulation pressure plate; 19-Side groove hole; 20-Elastic sealing sheet; 21-Front end cap inner cavity; 22-Propellant chamber cavity; 23-Propulsion cavity; 24-Rivet. Detailed Implementation

[0018] The specific embodiments of this utility model will now be clearly and completely described in conjunction with the accompanying drawings.

[0019] Example 1: A structure for preventing reverse pressure relief in a columnar fire extinguisher, the structure of which is as follows. Figure 1-4 As shown, the device includes a front end cap 1, cylinder 2, piston 3, rear end cap 4, mesh-surface explosive chamber 5, gas-generating explosive block 6, rubber stopper 7, rubber stopper base 8, rubber stopper cap 9, ignition heat-sensitive wire 10, extinguishing agent cavity 11 for storing perfluorohexanone extinguishing agent, ignition heat-sensitive wire 12, three-way air head 13, nozzle membrane 14, pressure membrane threaded joint 15, elbow 16, and atomizing nozzle 17. A heat-insulating pressure plate 18 is provided between the front end cap 1 and the mesh-surface explosive chamber 5. A side groove hole 19 in the shape of a waist hole is provided on the edge of the heat-insulating pressure plate 18 for the ignition heat-sensitive wire 10 to pass through. The distance between the rubber stopper cap 9 and the heat-insulating pressure plate 18 is greater than or equal to 3mm. The width of the side groove hole 19 on the heat-insulating pressure plate 18 is slightly smaller than that of the ignition heat-sensitive wire 10.

[0020] After the fire extinguisher is activated, the ignition coil 12 begins to burn, which then ignites the starting coil 10, and finally detonates the gas-generating propellant block 6. Because the through hole in the rubber stopper 7 automatically closes due to its elasticity after the starting coil 10 burns, the ignition of the gas-generating propellant block 6 in the propulsion chamber 23 produces a large amount of high-temperature, high-pressure gas, filling the propellant chamber 22 and the propulsion chamber 23. Although some gas passes through the side slot hole 19 on the heat-insulating pressure plate 18 into the inner cavity 21 of the front end cap, it is cooled by the heat dissipation of the front end cap 1 and the cylinder 2, and is then quickly extinguished. During the fire period, the temperature of the gas inside the front end cap cavity 21 is much lower than the temperature inside the extinguishing agent cavity 22, and does not reach the temperature of the carbonization point of the rubber stopper 7. Therefore, the rubber stopper 7 will not be charred to form a pressure relief channel. The central through hole of the rubber stopper 7 closes automatically due to its own elasticity. Thus, the front end cap cavity 21 can form a sealed cavity. Under the continuous combustion of the gas-producing extinguishing agent block 6, the high temperature and high pressure gas in the propulsion cavity 23 can continuously push the piston 3 to squeeze the extinguishing agent in the extinguishing agent cavity 11 and spray it out. It can also move and push the piston 3 to the limit point to complete the net discharge and release of the extinguishing agent.

[0021] The distance between the rubber stopper cap 9 and the heat insulation pressure plate 18 is greater than or equal to 3mm, which ensures the heat insulation distance. The width of the side groove hole 19 on the heat insulation pressure plate 18 is slightly smaller than that of the starting thermal wire 10, which facilitates the clamping and limiting of the starting thermal wire 10 and minimizes the flow of high temperature and high pressure gas in the medicine compartment cavity 22 into the inner cavity 21 of the front end cap.

[0022] Example 2: Based on the example, an elastic sealing sheet 20 is fixed to the end face of the pharmacy chamber 22 on one side of the heat-insulating pressure plate 18 by rivets 24. Under the action of the high-pressure gas in the pharmacy chamber 22, the elastic sealing sheet 20 can completely block the side slot hole 19. In this way, when the gas-generating pharmacy 6 is burned, the high-temperature and high-pressure gas generated in the pharmacy chamber 22 cannot enter the inner cavity 21 of the front end cap, thereby achieving heat insulation and pressure maintenance of the propulsion chamber 23 and eliminating the reverse pressure relief path of the fire extinguisher propulsion chamber 23. This has a direct effect on maintaining the constant pressure propulsion of the piston 3 and the net discharge of the extinguishing agent.

[0023] Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A structure for preventing reverse pressure relief in a columnar fire extinguisher, characterized in that: The device includes a front end cap (1), cylinder (2), piston (3), rear end cap (4), mesh surface explosive chamber (5), gas-generating explosive block (6), rubber stopper (7), rubber stopper base (8), rubber stopper cap (9), starting heat-sensitive wire (10), extinguishing agent cavity (11), initiation heat-sensitive wire (12), three-way air head (13), nozzle membrane (14), pressure membrane threaded joint (15), elbow (16), and atomizing nozzle (17). A heat-insulating pressure plate (18) is added between the front end cap (1) and the mesh surface explosive chamber (5). A waist-shaped side groove hole (19) is provided on the edge of the heat-insulating pressure plate (18) for the starting heat-sensitive wire (10) to pass through.

2. A structure for preventing reverse pressure relief in a columnar fire extinguisher, characterized in that: The distance between the rubber stopper cap (9) and the heat insulation pressure plate (18) is greater than or equal to 3mm.

3. A structure for preventing back pressure relief in a columnar fire extinguisher, characterized in that: The width of the side groove hole (19) on the heat-insulating pressure plate (18) is slightly smaller than that of the start-up thermal wire (10).

4. A structure for preventing back pressure relief in a columnar fire extinguisher, characterized in that: An elastic sealing sheet (20) is fixed on one end face of the medicine compartment cavity (22) of the heat insulation pressure plate (18). The elastic sealing sheet (20) can completely block the side slot hole (19) under the action of the high pressure gas in the medicine compartment cavity (22).

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