Reverse pressure relief net discharge type cylindrical fire extinguisher

Abstract

A kind of anti-reverse pressure relief net discharge type cylindrical fire extinguisher, the edge slot hole of waist hole shape is arranged on the edge of heat insulation pressure plate, for passing through starting heat sensitive wire, the elastic sheet is fixed on the end face of the side of cartridge cavity of heat insulation pressure plate, elastic sheet can fully cover edge slot hole under the action of high pressure gas in cartridge cavity, by eliminating the reverse pressure relief of head seal head inner cavity, improve net discharge effect.Long guide piston component can increase guide length, and does not reduce fire extinguishing agent capacity, improve the stability and reliability of piston sliding, realize net discharge purpose, set pressure relief structure between piston and cylinder or between piston and rear head, when piston moves to net discharge limit position, slow pressure relief of propulsion cavity can be formed, which helps the net discharge of fire extinguishing agent, and prevents the continuous increase of pressure in propulsion cavity caused by the combustion of excess gas generating medicine block, eliminates the explosion injury event caused by the high pressure in propulsion cavity during the disassembly process of fire extinguisher in later period.

Description

Technical Field

[0001] This utility model relates to the field of fire extinguisher technology, specifically to a columnar fire extinguisher. Background Technology

[0002] Piston-type perfluorohexanone fire extinguishing devices are specifically designed for particular spaces, combining the fire extinguishing advantages of perfluorohexanone with the unique characteristics of a piston structure. This device rapidly detects fire sources using multiple methods, including smoke, heat, and flame detection, and delivers the extinguishing agent directly to the ignition point via a piston drive, achieving precise fire suppression. The piston structure ensures efficient delivery of the extinguishing agent and stable operation under high pressure. Its slim and compact design makes it suitable for complex locations such as power equipment, communication base stations, data centers, and new energy vehicles.

[0003] Existing piston-type perfluorohexanone fire extinguishing devices, such as Figure 1 As shown, it includes a front end cap 1, cylinder body 2, piston assembly 3, rear end cap 4, mesh propellant chamber 5, gas-generating propellant block 6, rubber stopper 7, rubber stopper base 8, rubber stopper cap 9, ignition heat-sensitive wire 10, extinguishing agent chamber for storing perfluorohexanone 11, ignition heat-sensitive wire 12, three-way air head 13, nozzle membrane 14, membrane joint 15, elbow 16, atomizing nozzle 17, and heat-insulating pressure plate 18.

[0004] The working principle of the fire extinguishing device when activated is as follows: The ignition heat-sensitive wire 12 is arranged in the protected space within the three-way gas head 13. When the temperature rises or a fire breaks out, the ignition heat-sensitive wire 12 and the activation heat-sensitive wire 10 are ignited in sequence. When the gas-producing block 6 is ignited, a large amount of high-pressure gas is generated. The high-temperature and high-pressure gas in the high-pressure chamber generates axial pressure on the piston component 3, thereby pushing the piston component 3 to move to the right. This causes the perfluorohexanone extinguishing agent in the extinguishing agent cavity 11 to pressurize the nozzle membrane 14. When the nozzle membrane 14 ruptures, the perfluorohexanone extinguishing agent passes through the elbow 16 under the continuous push of the piston component 3 and is released from the atomizing nozzle 17, achieving the purpose of extinguishing the fire.

[0005] The existing column-shaped fire extinguishers have the following problems in actual use: First, there is a reverse pressure relief phenomenon on the left side of the piston component, which causes the piston component to gradually decrease in pushing pressure. This can lead to the piston component not being able to push to the end, resulting in a high residual rate of liquid extinguishing agent. This directly affects the extinguishing efficiency of the fire extinguisher, especially at critical moments of fire extinguishing, which may lead to incomplete fire extinguishing.

[0006] Observation and analysis revealed that upon activation, after the gas-generating explosive block 6 is ignited, a large amount of high-pressure gas is generated within the explosive 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 perforation in the center of the rubber stopper 7 to be burned into a channel by the high-temperature gas. Consequently, the high-temperature, high-pressure gas in the explosive chamber 22 leaks backwards through this burned channel in the center of the rubber stopper 7. This results in the pressure in the high-pressure propulsion chamber 23 failing to reach the expected pressure value, thus preventing the piston from advancing further. This directly affects the propulsion speed of the extinguishing agent, leading to an excessively high residual rate of the liquid extinguishing agent, thereby impacting the extinguishing effect.

[0007] Secondly, during the activation of the fire extinguishing system, the piston assembly frequently experiences jamming. This prevents the piston from moving forward properly, leading to incomplete discharge of the extinguishing agent and, in severe cases, rendering the column-type fire extinguisher malfunctioning. Therefore, it cannot extinguish fires when needed. Solving this problem would require increasing the piston's guide length. However, as is well known, fire extinguisher specifications are based on their capacity. For a specific specification of column-type fire extinguisher, the capacity of the extinguishing agent is fixed, reflected in its length, diameter, and other external dimensions. Increasing the guide length of the piston assembly would reduce the extinguishing agent capacity; therefore, this solution is not feasible.

[0008] Third, when the piston assembly moves to the left end near the rear end cap, the pressure in the high-pressure chamber and the liquid extinguishing chamber is close, preventing the piston assembly from pushing all the way in. This results in incomplete extinguishing of the fire extinguishing agent, leading to a high residual rate. More dangerously, after the fire extinguisher is used, the remaining gas-producing propellant lumps burn, causing the pressure in the high-pressure chamber to continuously increase. This could lead to an explosion and injury during the subsequent disassembly of the fire extinguisher due to excessive pressure in the high-pressure chamber. Utility Model Content

[0009] To address the aforementioned technical problems, the purpose of this utility model is to provide a reverse-pressure relief net discharge columnar fire extinguisher, which can at least solve one of the problems existing in the prior art.

[0010] The technical solution adopted by this utility model is as follows: A reverse-pressure relief, net-discharge columnar fire extinguisher includes a front end cap, cylinder, piston assembly, rear end cap, mesh-surfaced explosive chamber, gas-generating explosive block, rubber stopper, rubber stopper base, rubber stopper cap, activation heat-sensitive wire, extinguishing agent cavity, ignition heat-sensitive wire, three-way air nozzle, nozzle diaphragm, pressure diaphragm connector, elbow, atomizing nozzle, and heat-insulating pressure plate. The heat-insulating pressure plate has a side slot shaped like a waist hole for the activation heat-sensitive wire to pass through. An elastic sealing sheet is fixed to one end face of the explosive chamber on one side of the heat-insulating pressure plate. The elastic sealing sheet can completely block the side slot shaped hole under the action of high-pressure gas in the explosive chamber.

[0011] Furthermore, the piston component includes a long guide piston body, an inner pusher plug, a volume-enlarging cavity, and an axial retaining ring. The long guide piston body has a stepped hole structure at its center, a guide hole on the left side, and a volume-enlarging cavity on the right side for installing the inner pusher plug. The inner pusher plug and the guide hole are in a sealed sliding fit, and the long guide piston body and the cylinder body are also in a sealed sliding fit.

[0012] Furthermore, the sealing sliding fit structure between the inner pusher and the guide hole of the long guide piston body is such that a left inner seal and a right inner seal are respectively provided on the outer circles of the left and right ends of the inner pusher.

[0013] Furthermore, the inner thrust piston has a T-shaped structure, with a sealing valve at the right end and a guide spindle at the left end. The outer circle of the sealing valve and the inner hole of the expansion cavity of the long guide piston body are in a sealed sliding fit, and the outer circle of the guide spindle core and the guide hole of the long guide piston body are in a sealed sliding fit.

[0014] Furthermore, the sealing sliding fit structure between the long guide piston body and the cylinder body is as follows: a left outer seal and a right outer seal are respectively provided on the outer circles of the left and right ends of the long guide piston body. The right outer seal, left inner seal, and right inner seal are all O-rings, and the left outer seal is a skeleton oil seal. Furthermore, a starting buffer chamber is provided on the left side of the inner pusher to reduce the instantaneous axial force on the piston component caused by the high pressure and high gas generated instantaneously after the gas-producing block is ignited.

[0015] Furthermore, an avoidance notch is provided on the right end face of the inner pusher. When the inner pusher is pushed to the limit position, the right end face of the inner pusher is flush with the right end face of the long guide piston body. The long guide piston body includes a left pressure ring and a piston body. The left pressure ring is fixed on the left end face of the piston body. Its purpose is to facilitate the processing of the skeleton oil seal groove and the installation of the skeleton oil seal.

[0016] Furthermore, an axial pressure relief groove is provided on the inner wall of the right side of the cylinder, and the axial length of the axial pressure relief groove is greater than the guide length of the piston component.

[0017] Furthermore, the piston component is an end-face pressure relief structure. A starting buffer chamber is provided on the left end face of the piston component. A coaxial stepped hole is provided between the starting buffer chamber and the right end face of the piston. A threaded hole is located at the left end of the stepped hole and a through hole is located at the right end. The diameter of the through hole is smaller than the bottom diameter of the threaded hole. A pressure relief membrane is provided at the shoulder between the threaded hole and the through hole. A hollow threaded sleeve is provided in the threaded hole. The pressure relief membrane is axially sealed by the compression of the hollow threaded sleeve. An axial piercing needle is provided between the right end face of the piston component and the rear end cap. The tip of the axial piercing needle is aligned with the pressure relief membrane.

[0018] Furthermore, the axial piercing needle is fixed on the left side of the rear end cap or on the right side of the piston assembly.

[0019] After the fire extinguisher is activated, the ignition coil begins to burn, which then ignites the starting coil, ultimately detonating the propellant. After the starting coil burns, the through-hole in the rubber stopper automatically closes due to its elasticity. At this point, the ignition of the propellant produces a large amount of high-temperature, high-pressure gas in the propulsion chamber, filling both the propellant chamber and the propulsion chamber. Although some gas passes through the side slots on the heat-insulating pressure plate into the inner cavity of the front head, the front head and cylinder have excellent heat dissipation properties. Therefore, the temperature of the gas entering the inner cavity of the front head is much lower than the temperature inside the propellant chamber, not reaching the temperature required to carbonize the rubber stopper. Thus, the inner cavity of the front head forms a well-sealed cavity, maintaining a sealed state during the fire extinguishing process. As the propellant continues to burn during the fire extinguishing process, the high-temperature, high-pressure gas in the propulsion chamber continuously pushes the piston to its limit position, achieving a net release of the extinguishing agent.

[0020] 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, minimizes the thermal damage to the rubber stopper caused by the high temperature and high pressure gas in the medicine chamber, and also reduces the flow of hot gas entering the inner cavity of the front end cap.

[0021] 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 reverse pressure relief path of the fire extinguisher, thereby achieving the heat insulation and pressure-maintaining effect on the propulsion chamber, and directly affecting the pressure-maintaining and rightward propulsion of the piston.

[0022] Designing the piston assembly as a long guide structure extends its actual guiding length without reducing the extinguishing agent capacity. This piston assembly structure is ideally suited to the working environment of a columnar fire extinguisher. When the columnar fire extinguisher is activated, the detonation of the propellant block instantly generates high-pressure gas, which exerts the maximum instantaneous axial force on the piston assembly. To mitigate this instantaneous axial force, an activation buffer chamber is effectively placed on the left end face of the piston assembly. Increasing the guiding length of the piston assembly improves guiding stability and eliminates the obstruction caused by lateral deviation during the pushing process. A capacity-enhancing chamber is placed on the right end of the piston assembly, increasing the smooth guiding length without reducing the extinguishing agent capacity.

[0023] By placing an inner thrust plug at the center of the piston, when the piston is pushed to its limit position and the pressure is released, the extinguishing agent can be completely discharged through the squeezing of the inner thrust plug.

[0024] An axial pressure relief groove is provided on the inner wall of the right side of the cylinder body. The axial length of the axial pressure relief groove is greater than the guide length of the piston assembly. In this way, when the piston assembly is pushed to its limit position, a path for slow pressure relief is left between the propulsion chamber and the extinguishing agent chamber. This can quickly and completely squeeze out the liquid extinguishing agent on the right side of the piston assembly, achieving a clean discharge of the liquid extinguishing agent and reducing the residual rate of extinguishing agent. At the same time, after the fire is completely extinguished, it can prevent the combustion of excess gas-generating propellant blocks, which would cause the pressure in the propulsion chamber to continue to increase. This eliminates the possibility of explosions and injuries caused by excessive pressure in the propulsion chamber during the later disassembly of the fire extinguisher.

[0025] The design of an end-face pressure relief structure between the piston assembly and the rear end cap serves the same purpose as the axial pressure relief groove on the inner wall of the cylinder's right side bore: to ensure that when the piston assembly is pushed to its limit position, a slow pressure relief path is left between the propulsion chamber and the extinguishing agent chamber. This allows for the rapid and complete expulsion of the liquid extinguishing agent from the right side of the piston assembly, achieving a clean discharge of the liquid extinguishing agent and reducing the residual rate of the extinguishing agent. Furthermore, after the complete clean discharge and extinguishing of the fire, it prevents the combustion of excess gas-generating propellant blocks, which could lead to a continuous increase in pressure within the propulsion chamber. This eliminates the possibility of explosions and injuries caused by excessive pressure within the propulsion chamber during the later disassembly of the fire extinguisher. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of an existing column-shaped fire extinguisher; Figure 2 A schematic diagram of the structure for preventing reverse pressure relief at the front end cap of a fire extinguisher; Figure 3 for Figure 2 A schematic diagram of a type of heat-insulating pressure-bearing plate; Figure 4 for Figure 2 Schematic diagram of the structure of the combination of the heat insulation pressure plate and the elastic sheet; Figure 5 This is a schematic diagram of the structure of this utility model; Figure 6 for Figure 5 A close-up view of the left side of the piston assembly; Figure 7 for Figure 6 Enlarged view of the piston component; Figure 8 for Figure 7 A schematic diagram of a medium-length guide piston body; Figure 9 for Figure 7 A schematic diagram of a type of internal thruster; Figure 10 This is a schematic diagram of the structure at the right end of the cylinder block; Figure 11 for Figure 10AA section view; Figure 12 This is a schematic diagram of the end-face pressure relief structure of this utility model; Figure 13 for Figure 12 Schematic diagram of the piston component; Figure 14 Figure 13 Schematic diagram of the structure after the hollow threaded sleeve and pressure relief membrane have been removed; Figure 15 This is a schematic diagram of the structure of a hollow threaded sleeve.

[0027] In the diagram: 1-Front end cap; 2-Cylinder body; 3-Piston assembly; 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 connector; 16-Elbow; 17-Atomizing nozzle; 18-Heat insulation pressure plate; 19-Side slot hole; 20-Elastic sealing sheet; 21-Front end cap inner cavity; 22-Propellant chamber cavity; 23-Propulsion cavity; 24-Rivet; 25-Axial direction. Pressure relief groove; 31-Long guide piston body; 32-Right outer seal; 33-Left outer seal; 34-Inner pusher plug; 35-Left inner seal; 36-Right inner seal; 37-Volume-increasing cavity; 38-Axial retaining ring; 39-Starting buffer cavity; 311-Guide hole; 312-Left pressure ring; 313-Piston body; 341-Sealing valve; 342-Guide spindle; 343-Allowing notch; 301-Threaded hole; 302-Through hole; 303-Pressure relief diaphragm; 304-Hollow threaded sleeve; 305-Adjusting groove; 41-Axial piercing needle. Detailed Implementation

[0028] The specific embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0029] Example 1: A reverse-pressure relief-preventing, net-discharge columnar fire extinguisher, such as... Figures 1-4 As shown, the assembly includes a front end cap 1, a cylinder body 2, a piston assembly 3, a rear end cap 4, a mesh-surfaced explosive chamber 5, a gas-generating explosive block 6, a rubber stopper 7, a rubber stopper base 8, a rubber stopper cap 9, a starting thermal wire 10, an extinguishing agent cavity 11, an initiation thermal wire 12, a three-way air valve 13, a nozzle membrane 14, a membrane connector 15, an elbow 16, an atomizing nozzle 17, and a heat-insulating pressure plate 18. A side groove 19 in the shape of a waist hole is provided on the edge of the heat-insulating pressure plate 18 for the starting thermal wire 10 to pass through. An elastic sealing sheet 20 is fixed to the end face of the explosive chamber 22 on one side of the heat-insulating pressure plate 18 by rivets 24. The elastic sealing sheet 20 can completely block the side groove 19 under the action of high-pressure gas in the explosive chamber 22.

[0030] Example 2: Based on Example 1, a piston component 3 is used, such as... Figures 5-9 As shown, the system includes a long guide piston body 31, an inner pusher 34, a volume-enlarging cavity 37, and an axial retaining ring 38. The long guide piston body 31 has a stepped hole structure at its center, a guide hole 311 on the left side, and a volume-enlarging cavity 37 on the right side for installing the inner pusher 34. The inner pusher 34 and the guide hole 311 are in a sealed sliding fit. The long guide piston body 31 and the cylinder body 2 are also in a sealed sliding fit. The sealed sliding fit structure between the inner pusher 34 and the guide hole 311 of the long guide piston body 31 is such that a left inner seal 35 and a right inner seal 36 are respectively provided on the outer circles of the left and right ends of the inner pusher 34.

[0031] The inner thruster 34 has a T-shaped structure, with a sealing valve 341 at the right end and a guide spindle 342 at the left end. The outer circle of the sealing valve 341 and the inner hole of the expansion cavity 37 of the long guide piston body 31 are in a sealed sliding fit, and the outer circle of the guide spindle 342 and the guide hole 311 of the long guide piston body 31 are in a sealed sliding fit.

[0032] The sealing sliding fit structure between the long guide piston body 31 and the cylinder body 2 is as follows: a left outer seal 33 and a right outer seal 32 are respectively provided on the outer circles of the left and right ends of the long guide piston body 31. The right outer seal 32, the left inner seal 35 and the right inner seal 36 are all O-rings, and the left outer seal 33 is a skeleton oil seal.

[0033] A starting buffer chamber 39 is provided on the left side of the inner propellant 34 to reduce the instantaneous axial force on the piston component caused by the high pressure and high gas generated instantly after the gas-producing block 6 is ignited.

[0034] An avoidance notch 343 is provided on the right end face of the inner pusher 34. When the inner pusher 34 is pushed to the limit position, the right end face of the inner pusher 34 is flush with the right end face of the long guide piston body 31. The long guide piston body 31 includes a left pressure ring 312 and a piston body 313. The left pressure ring 312 is fixed on the left end face of the piston body 313. Its purpose is to facilitate the processing of the skeleton oil seal groove and the installation of the skeleton oil seal.

[0035] Example 3: Based on Example 2, such as Figure 10 and Figure 11 As shown, an axial pressure relief groove 25 is provided on the inner wall of the right side of the cylinder 2. The axial length of the axial pressure relief groove 25 is greater than the guide length of the piston component 3.

[0036] Example 4: Based on Example 2, the piston component 3 is an end-face pressure relief structure, such as... Figures 12-15As shown, a starting buffer chamber 39 is provided on the left end face of the piston component 3. A coaxial stepped hole is provided between the starting buffer chamber 39 and the right end face of the piston. A threaded hole 301 is located at the left end of the stepped hole, and a through hole 302 is located at the right end. The diameter of the through hole 302 is smaller than the bottom diameter of the threaded hole 301. A pressure relief membrane 303 is provided at the shoulder between the threaded hole 301 and the through hole 302. A hollow threaded sleeve 304 is provided in the threaded hole 301. The pressure relief membrane 303 is squeezed by rotating the hollow threaded sleeve 304 through the adjusting groove 305, thereby achieving the effect of axial sealing. An axial piercing needle 41 is provided between the right end face of the piston component 3 and the rear end cap 4. The tip of the axial piercing needle 41 is aligned with the pressure relief membrane 303.

[0037] In this example, the axial piercing needle 41 is fixed on the left side of the rear end cap 4 or on the right side of the piston component 3.

[0038] After the fire extinguisher is activated, the ignition coil 12 begins to burn, which then ignites the activation 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 activation coil 10 burns, a large amount of high-temperature, high-pressure gas is produced in the propulsion chamber 23 by the ignition of the gas-generating propellant block 6, 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, the gas temperature in the inner cavity 21 of the front end cap is much lower than the temperature in the propellant chamber 22 due to the good heat dissipation performance of both the front end cap 1 and the cylinder 2, and does not reach the temperature required to carbonize the rubber stopper 7. The inner cavity 21 of the front end cap is a good sealed cavity, eliminating the path of reverse pressure relief and maintaining a sealed state during the fire extinguishing process. Because the gas-generating propellant block 6 continues to burn during the fire extinguishing process, the propulsion chamber 23 achieves a pressure-maintaining and pressurizing effect, ensuring that the high-temperature, high-pressure gas can continuously push the piston to its limit position. This design can prevent reverse pressure relief within the inner cavity 21 of the front end cap, which helps to achieve net discharge of the extinguishing agent.

[0039] The distance between the rubber stopper cap 9 and the heat insulation pressure plate 18 is greater than or equal to 3mm. This ensures the heat insulation distance and reduces the heat damage to the rubber stopper 7 caused by the high-temperature and high-pressure gas in the medicine chamber 22. 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. This facilitates the locking and limiting of the starting thermal wire 10 and minimizes the flow of high-temperature and high-pressure gas in the medicine chamber 22 into the inner cavity 21 of the front end cap.

[0040] If an elastic sealing sheet 20 is fixed on one end face of the medicine chamber 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 high pressure gas. In this way, when the gas-producing medicine block 6 burns, the high temperature and high pressure gas generated in the medicine chamber 22 cannot enter the inner cavity 21 of the front end cap. This can completely eliminate the reverse pressure relief path of the fire extinguisher, thereby achieving the heat insulation and pressure preservation effect on the propulsion chamber 23, which has a direct effect on the pressure preservation and rightward propulsion of the piston.

[0041] Designing piston component 3 as a long guiding structure extends its actual guiding length without reducing the extinguishing agent capacity. This structure is ideally suited to the working environment of a columnar fire extinguisher. When the columnar fire extinguisher is activated, the gas-generating block 6 detonates and ignites, instantly generating high-pressure gas. This generates the maximum instantaneous axial force on piston component 3. To mitigate this instantaneous axial force, an activation buffer chamber 39 is provided on the left end face of piston component 3, which is effective. Increasing the guiding length of piston component 3 improves guiding stability and eliminates the obstruction caused by lateral deviation during the pushing process. A capacity-enhancing chamber 37 is provided on the right end of the piston, increasing the smooth guiding length without reducing the extinguishing agent capacity.

[0042] By setting an inner thrust plug 34 at the center of the piston, when the piston is pushed to its limit position and in a depressurized state, the extinguishing agent can be completely discharged through the squeezing of the inner thrust plug 34.

[0043] An axial pressure relief groove 25 is provided on the inner wall of the right side of the cylinder 2. The axial length of the axial pressure relief groove 25 is greater than the guide length of the piston component 3. In this way, when the piston component 3 is pushed to the limit position, a path for slow pressure relief is left between the propulsion chamber 23 and the extinguishing agent chamber 11. This can quickly and completely squeeze out the liquid extinguishing agent on the right side of the piston component 3, achieve a clean discharge of the liquid extinguishing agent, reduce the residual rate of the extinguishing agent, and prevent the excess gas-generating propellant 6 from burning after the fire is completely extinguished, which would cause the pressure in the propulsion chamber 23 to continuously increase. This eliminates the possibility of an explosion and injury caused by excessive pressure in the propulsion chamber 23 during the later disassembly of the fire extinguisher.

[0044] The design of an end-face pressure relief structure between the piston assembly 3 and the rear end cap 4 serves the same purpose as the axial pressure relief groove 25 on the inner wall of the cylinder 2 on the right side. Both aim to ensure that when the piston assembly 3 is pushed to its limit position, a slow pressure relief path is left between the propulsion chamber 23 and the extinguishing agent chamber 11. This allows the liquid extinguishing agent on the right side of the piston assembly 3 to be quickly and completely squeezed out, achieving a clean discharge of the liquid extinguishing agent and reducing the residual rate of the extinguishing agent. It also prevents the combustion of excess gas-generating propellant 6 after the fire extinguisher has been completely discharged, thus preventing the pressure inside the propulsion chamber 23 from continuously increasing. This eliminates the possibility of an explosion or injury caused by excessive pressure inside the propulsion chamber 23 during the later disassembly of the fire extinguisher.

[0045] The present invention has various alternative solutions with the same functions. Based on this embodiment, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

Claims

1. A reverse-pressure relief type columnar fire extinguisher, comprising a front end cap (1), a cylinder (2), a piston assembly (3), a rear end cap (4), a mesh-surfaced explosive chamber (5), a gas-generating explosive block (6), a rubber stopper (7), a rubber stopper base (8), a rubber stopper cap (9), an activation heat-sensitive wire (10), a fire extinguishing agent chamber (11), an initiation heat-sensitive wire (12), a three-way air valve (13), a nozzle membrane (14), a membrane connector (15), an elbow (16), an atomizing nozzle (17), and a heat-insulating pressure plate (18), characterized in that: A side slot (19) in the shape of a waist hole is provided on the edge of the heat-insulating pressure plate (18) for passing through the start-up thermal sensitive wire (10). An elastic sealing sheet (20) is fixed on the end face of the medicine chamber (22) on one side of the heat-insulating pressure plate (18). The elastic sealing sheet (20) can completely block the side slot (19) under the action of the high pressure gas in the medicine chamber (22).

2. The anti-reverse pressure relief net discharge column fire extinguisher according to claim 1, characterized in that: The piston component (3) includes a long guide piston body (31), an inner pusher (34), a volume-enlarging cavity (37), and an axial retaining ring (38). The long guide piston body (31) has a coaxial stepped hole structure at its center, with a guide hole (311) on the left and a volume-enlarging cavity (37) on the right. The inner pusher (34) is installed in the guide hole (311) and the volume-enlarging cavity (37). The inner pusher (34) is in a sealed sliding fit with the guide hole (311) and the volume-enlarging cavity (37). The long guide piston body (31) is also in a sealed sliding fit with the cylinder body (2).

3. The reverse-pressure relief type columnar fire extinguisher according to claim 2, characterized in that: The sealing sliding fit structure between the inner pusher (34) and the guide hole (311) of the long guide piston body (31) is such that a left inner seal (35) and a right inner seal (36) are respectively provided on the outer circles of the left and right ends of the inner pusher (34).

4. The anti-reverse pressure relief net discharge column fire extinguisher according to claim 2, characterized in that: The inner thruster (34) has a T-shaped structure, with a sealing valve (341) at the right end and a guide spindle (342) at the left end. The outer circle of the sealing valve (341) and the inner hole of the expansion cavity (37) of the long guide piston body (31) are in a sealed sliding fit. The outer circle of the guide spindle (342) and the guide hole (311) of the long guide piston body (31) are in a sealed sliding fit.

5. The anti-reverse pressure relief net discharge column fire extinguisher according to claim 2, characterized in that: The sealing sliding fit structure between the long guide piston body (31) and the cylinder body (2) is as follows: a left outer seal (33) and a right outer seal (32) are respectively provided on the outer circles of the left and right ends of the long guide piston body (31). The right outer seal (32), the left inner seal (35), and the right inner seal (36) are all O-rings, and the left outer seal (33) is a skeleton oil seal.

6. The anti-reverse pressure relief net discharge column fire extinguisher according to claim 2, characterized in that: A starting buffer chamber (39) is provided on the left side of the inner propellant (34) to reduce the instantaneous axial force on the piston component caused by the high pressure and high gas generated instantly after the gas-producing block is ignited.

7. The anti-reverse pressure relief net discharge column fire extinguisher according to claim 2, characterized in that: An avoidance notch (343) is provided on the right end face of the inner pusher (34). When the inner pusher (34) is pushed to the limit position, the right end face of the inner pusher (34) is flush with the right end face of the long guide piston body (31). The long guide piston body (31) includes a left pressure ring (312) and a piston body. The left pressure ring (312) is fixed on the left end face of the piston body. Its purpose is to facilitate the processing of the skeleton oil seal groove and the installation of the skeleton oil seal.

8. A reverse-pressure relief, net-discharge type columnar fire extinguisher according to claim 1 or 2, characterized in that: An axial pressure relief groove (23) is provided on the inner wall of the right side of the cylinder (2). The axial length of the axial pressure relief groove (23) is greater than the guide length of the piston component.

9. A reverse-pressure relief, net-discharge columnar fire extinguisher according to claim 1, characterized in that: in The piston assembly (3) has a starting buffer chamber (39) on its left end face. A coaxial stepped hole is provided between the starting buffer chamber (39) and the right end face of the piston. The left end of the stepped hole is a threaded hole (301), and the right end is a through hole (302). The diameter of the through hole (302) is smaller than the bottom diameter of the threaded hole (301). A pressure relief membrane (303) is provided at the shoulder between the threaded hole (301) and the through hole (302). A hollow threaded sleeve (304) is provided in the threaded hole (301). The pressure relief membrane (303) is axially sealed by the hollow threaded sleeve (304). An axial piercing needle (41) is provided between the right end face of the piston assembly (3) and the rear end cap (4). The tip of the axial piercing needle (41) is aligned with the pressure relief membrane (303).

10. The anti-reverse pressure relief net discharge column fire extinguisher according to claim 9, characterized in that: The axial piercing needle (41) is fixed on the left side of the rear end cap (4) or on the right side of the piston assembly (3).

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