Side seam pressure relief and venting structure for a cylindrical fire extinguisher

Abstract

A kind of side seam pressure relief net discharge structure of cylindrical fire extinguisher, including cylinder, piston and rear head, piston is installed in the inner hole of cylinder in sealed sliding mode, rear head is sealedly installed in the right end of cylinder, at least one axial vent is provided on the inner hole side wall of the right end of cylinder, the axial length of axial vent is greater than or equal to the axial guiding length of piston.When the piston is pushed to the limit position of the right side of cylinder, the left end face of piston passes over the left side of axial vent on the right side wall of cylinder inner hole, the high-pressure cavity on the left side of piston communicates with the low-pressure cavity on the right side of piston, realizes fast pressure relief, so that liquid extinguishing agent on the right side of piston can be squeezed out quickly and thoroughly, realize the net discharge of liquid extinguishing agent, reduce the residual rate of extinguishing agent.

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 19, a cylinder body 1, a piston 2, a rear end cap 3, a rubber stopper base 14, a rubber stopper 15, a rubber stopper cap 16, a mesh-surface explosive chamber 17, a gas-generating explosive block 18, a heat-sensitive wire 12, a high-pressure chamber 5, a low-pressure chamber 6 for storing perfluorohexanone extinguishing agent, a three-way air valve 13, a nozzle diaphragm 8, a pressure diaphragm threaded connector 9, an elbow 10, and an atomizing nozzle 11.

[0004] The working principle of the fire extinguishing device when activated is as follows: The heat-sensitive wire 12 is arranged in the protected space within the three-way vent 13. When the temperature rises or a fire breaks out, the heat-sensitive wire 12 is ignited, which in turn ignites the gas-generating block 18, producing a large amount of high-pressure gas. This gas pushes the piston 2 to the right. The high-temperature and high-pressure gas in the high-pressure chamber 5 exerts axial pressure on the piston 2, thereby pushing the liquid extinguishing agent in the low-pressure chamber 6 to pressurize the nozzle membrane 8. When the nozzle membrane 8 ruptures, the extinguishing agent is continuously pushed by the piston 2 through the elbow 10 and released from the atomizing nozzle 11.

[0005] In actual use, existing column-shaped fire extinguishers sometimes fail to push the piston all the way to the right side when the piston moves close to the right end. This results in an excessively high residual extinguishing agent rate, meaning that not all the extinguishing agent in the extinguisher can be used to extinguish the fire, directly affecting the extinguishing effect. The existing product structure cannot achieve net discharge of extinguishing agent. Utility Model Content

[0006] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a side-slit pressure relief and drainage structure for a columnar fire extinguisher.

[0007] The technical solution adopted is as follows: A side-slot pressure relief and drainage structure for a columnar fire extinguisher includes a cylinder, a piston, and a rear end cap. The piston is installed in the inner hole of the cylinder in a sealed sliding manner, and the rear end cap is sealed and installed at the right end of the cylinder. At least one axial ventilation channel is provided on the side wall of the inner hole at the right end of the cylinder, and the axial length of the axial ventilation channel is greater than or equal to the axial guide length of the piston.

[0008] Furthermore, three axial ventilation channels are provided on the inner wall of the right end of the cylinder.

[0009] Furthermore, the axial ventilation channel is a straight inner groove.

[0010] Furthermore, the axial ventilation channel is a spiral inner groove.

[0011] When the piston is pushed to its limit position on the right side of the cylinder, and the left end face of the piston passes the left side of the axial venting channel on the right side wall of the cylinder's inner bore, a slow pressure relief channel is set between the high-pressure chamber on the left side of the piston and the low-pressure chamber on the right side of the piston. This allows for slow pressure relief between the high-pressure and low-pressure chambers, which can quickly and completely squeeze out the liquid extinguishing agent on the right side of the piston, achieving a clean discharge of the liquid extinguishing agent and reducing the residual rate of the extinguishing agent. It can also prevent the combustion of excess gas-producing propellant blocks after the fire is completely extinguished, thus preventing the pressure in the high-pressure chamber from continuously increasing. This eliminates the possibility of explosions and injuries caused by excessive pressure in the high-pressure chamber during the later disassembly of the fire extinguisher. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model when the piston is in the discharged state; Figure 3 This is a schematic diagram of the cylinder block structure; Figure 4 for Figure 3 AA sectional view.

[0013] The numbers on the map are: 1-Cylinder block; 2-Piston; 3-Rear end cap; 4-Axial vent; 5-High pressure chamber; 6-Low pressure chamber; 7-End face protrusion; 8-Nozzle membrane; 9-Pressure membrane threaded connector; 10-Elbow; 11-Atomizing nozzle; 12-Thermosensitive wire; 13-Three-way air head; 14-Rubber stopper base; 15-Rubber stopper; 16-Rubber stopper cap; 17-Mesh medicine tank; 18-Gas-producing block; 19-Front end cap. Detailed Implementation

[0014] The specific embodiments of this utility model will now be clearly and completely described with reference to the accompanying drawings. 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 scope of protection of this utility model.

[0015] Example 1: A net discharge type columnar fire extinguisher, such as Figure 1-4 As shown, the extinguisher includes a thermal wire 12, a three-way vent 13, a rubber stopper base 14, a rubber stopper 15, a rubber stopper cap 16, a mesh-surface powder chamber 17, a gas-generating powder block 18, a front end cap 19, a cylinder 1, a piston 2, a rear end cap 3, an axial vent 4, a high-pressure chamber 5, a low-pressure chamber 6, an end face protrusion 7, a nozzle diaphragm 8, a pressure diaphragm threaded connector 9, an elbow 10, and an atomizing nozzle 11. When the fire extinguisher is activated, the thermal wire 12 begins to burn, igniting the gas-generating powder block 18. Because the through-hole in the middle of the rubber stopper 15 automatically closes due to its elasticity after the thermal wire 12 burns, a large amount of high-temperature, high-pressure gas is produced in the high-pressure chamber 5 due to the ignition of the gas-generating powder block 18. The body is filled in the high-pressure chamber 5, pushing the piston 2 to move to the right. When the left end face of the piston 2 passes the left side of the axial venting channel 4 on the right side wall of the cylinder 1, the high-pressure chamber 5 on the left side of the piston 2 and the low-pressure chamber 6 on the right side of the piston 2 achieve slow pressure relief through the axial venting channel 4. This allows the liquid extinguishing agent on the right side of the piston to be quickly and completely squeezed out, achieving a clean discharge of the liquid extinguishing agent, reducing the residual rate of the extinguishing agent, and preventing the excess gas-generating propellant 18 from burning after the fire extinguisher is completely discharged, thus preventing the pressure in the high-pressure chamber 5 from continuously increasing. This also eliminates the possibility of an explosion and injury caused by excessive pressure in the high-pressure chamber 5 during the later disassembly of the fire extinguisher.

[0016] The net pressure relief structure includes a cylinder 1, a piston 2, and a rear end cap 3. The piston 2 is installed in the inner hole of the cylinder 1 in a sealed sliding manner. The rear end cap 3 is sealed and installed at the right end of the cylinder 1. Two axial ventilation channels 4 are provided circumferentially on the inner wall of the right end of the cylinder 1. The axial length of the axial ventilation channel 4 is greater than or equal to the axial guide length of the piston 2. The axial ventilation channel 4 is a straight inner groove.

[0017] Of course, the axial ventilation channel 4 can also be designed as a spiral inner groove.

Claims

1. A side-slot pressure relief and net discharge structure for a columnar fire extinguisher, characterized in that: The cylinder includes a cylinder body (1), a piston (2) and a rear end cap (3). The piston (2) is installed in the inner hole of the cylinder body (1) in a sealed sliding manner. The rear end cap (3) is installed in a sealed manner at the right end of the cylinder body (1). At least one axial ventilation channel (4) is provided on the side wall of the inner hole at the right end of the cylinder body (1). The axial length of the axial ventilation channel (4) is greater than or equal to the axial guide length of the piston (2).

2. The side-slit pressure relief and net discharge structure of a columnar fire extinguisher according to claim 1, characterized in that: Three axial ventilation channels (4) are provided on the inner wall of the right end of the cylinder (1).

3. The side-slot pressure relief and net discharge structure of a columnar fire extinguisher according to claim 1 or 2, characterized in that: The axial ventilation channel (4) is a straight inner groove.

4. The side-slot pressure relief and net discharge structure of a columnar fire extinguisher according to claim 1 or 2, characterized in that: The axial ventilation channel (4) is a spiral inner groove.

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