A cylindrical fire extinguisher's clean exhaust end face pressure relief structure

Abstract

A kind of clean discharge end face pressure relief 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, coaxial step hole is provided between the left and right end faces of piston, the left end of step hole is threaded hole, the right end is through hole, the diameter of through hole is less than the diameter of threaded hole, relief membrane is provided at the shaft shoulder between threaded hole and through hole, hollow threaded sleeve is provided in threaded hole, relief membrane is extruded to realize axial sealing by hollow threaded sleeve, axial piercing needle is provided between the right end face of piston and rear head, the needle tip of axial piercing needle is aligned with relief membrane, to realize the clean discharge of liquid fire extinguishing agent, reduce the remaining rate of fire extinguishing agent, after completing the thorough clean discharge of fire extinguishing agent, prevent the continuous increase of pressure in high-pressure cavity caused by the burning of excessive gas-producing medicine block, eliminate the occurrence of explosion injury caused by the excessive pressure in high-pressure 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] The existing piston-type perfluorohexanone fire extinguishing device mainly consists of a front end cap 20, cylinder 1, piston 2, rear end cap 3, rubber stopper base 15, rubber stopper 16, rubber stopper cap 17, mesh-surface explosive chamber 18, gas-generating explosive block 19, heat-sensitive wire 13, high-pressure chamber 7, low-pressure chamber 8 (perfluorohexanone fire extinguishing agent), three-way air head 14, nozzle membrane 9, double-threaded connector 10, elbow 11, and atomizing nozzle 12.

[0004] The working principle of the fire extinguishing device when activated is as follows: The heat-sensitive wire 13 is arranged in the protected space inside the three-way air head 14. When the temperature rises or a fire breaks out, the heat-sensitive wire 13 is ignited, which ignites the gas-generating block 19 and generates a large amount of high-pressure gas. This pushes the piston 2 to the right. The high-temperature and high-pressure gas in the high-pressure chamber 7 exerts axial pressure on the piston 2, thereby pushing the liquid extinguishing agent in the low-pressure chamber 8 to pressurize the nozzle membrane 9. When the nozzle membrane 9 ruptures, the extinguishing agent passes through the elbow 11 under the continuous push of the piston 2 and is released from the atomizing nozzle 12.

[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 pressure relief structure for the net discharge end face of a columnar fire extinguisher.

[0007] The technical solution adopted is as follows: A pressure relief structure for the net discharge end face of 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. The rear end cap is sealed and installed at the right end of the cylinder. A coaxial stepped hole is provided between the left and right end faces of the piston. The left end of the stepped hole is a threaded hole, and the right end is a through hole. The diameter of the through hole is smaller than the 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 and the rear end cap. The tip of the axial piercing needle is aligned with the pressure relief membrane.

[0008] Furthermore, the axial piercing needle is fixed on the left side of the rear end cap.

[0009] Furthermore, the axial piercing needle is fixed to the right side of the piston.

[0010] Furthermore, the axial piercing needle includes an elastic connecting piece and an axial needle. One end of the elastic connecting piece is fixed to the right end face of the piston, and the axial needle is disposed on the other end of the elastic connecting piece.

[0011] When the piston is pushed to its limit position on the right side of the cylinder, the axial piercing needle will pierce the pressure relief film on the piston under the pressure of the inner side of the rear end cap. This creates a slow pressure relief path 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 slow pressure relief allows the high-pressure chamber to keep pushing the piston to its limit position on the right side, thereby quickly and completely squeezing 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 also prevents the combustion of excess gas-producing flammable material after the fire is completely extinguished, which would cause the pressure in the high-pressure chamber to continue to increase. This eliminates the possibility of an explosion and injury 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 piston component in this utility model; Figure 3 This is a schematic diagram of the structure of the piston and axial piercing needle assembly; Figure 4 This is a schematic diagram of the structure of a hollow threaded sleeve.

[0013] The labels in the diagram are as follows: 1-Cylinder body; 2-Piston; 3-Rear end cap; 4-Hollow threaded sleeve; 5-Pressure relief membrane; 6-Axial piercing needle; 7-High pressure chamber; 8-Low pressure chamber; 9-Nozzle membrane; 10-Double-ended threaded connector; 11-Elbow; 12-Atomizing nozzle; 13-Thermosensitive wire; 14-Three-way vent; 15-Rubber stopper base; 16-Rubber stopper; 17-Rubber stopper cap; 18-Mesh drug chamber; 19-Gas-producing drug block; 20-Front end cap; 21-Threaded hole; 22-Through hole; 23-Shoulder; 61-Elastic connecting piece; 62-Axial needle. 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 pressure relief structure for the net discharge end face of a columnar fire extinguisher 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. A coaxial stepped hole is provided between the left and right end faces of the piston 2. The left end of the stepped hole is a threaded hole 21, and the right end is a through hole 22. The diameter of the through hole 22 is smaller than the diameter of the threaded hole 21. A pressure relief membrane 5 is provided at the shoulder 23 between the threaded hole 21 and the through hole 22. A hollow threaded sleeve 4 is provided in the threaded hole 21. The pressure relief membrane 5 is axially sealed by the compression of the hollow threaded sleeve 4. An axial piercing needle 6 is provided between the right end face of the piston 2 and the rear end cap 3. The tip of the axial piercing needle 6 is aligned with the pressure relief membrane 5.

[0016] In this example, the axial piercing needle 6 includes an elastic connecting piece 61 and an axial needle 62. One end of the elastic connecting piece 61 is fixed to the right end face of the piston 2, and the axial needle 62 is disposed on the other end of the elastic connecting piece 61.

[0017] A drain-type columnar fire extinguisher of this utility model, such as Figure 1As shown, the extinguisher includes a cylinder body 1, piston 2, rear end cap 3, hollow threaded sleeve 4, pressure relief diaphragm 5, axial piercing needle 6, high-pressure chamber 7, low-pressure chamber 8, nozzle diaphragm 9, double-threaded connector 10, elbow 11, atomizing nozzle 12, heat-sensitive wire 13, three-way vent 14, rubber stopper base 15, rubber stopper 16, rubber stopper cap 17, mesh-surfaced explosive chamber 18, gas-generating explosive block 19, and front end cap 20. When the extinguisher is activated, the heat-sensitive wire 13 begins to burn, igniting the gas-generating explosive block 19. Because the through hole in the middle of the rubber stopper 16 automatically closes due to its elasticity after the heat-sensitive wire 13 burns, gas is generated in the high-pressure chamber 7. The ignition of the explosive block 19 generates a large amount of high-temperature, high-pressure gas, filling the high-pressure chamber 7 and pushing the piston 2 to the right. When the right end face of the piston 2 approaches the left end face of the rear end cap 3, the axial piercing needle 6 on the right end face of the piston 2 is squeezed by the left end face of the rear end cap 3, and the pressure relief membrane 5 is pierced by the axial needle 62, creating a slow pressure relief channel between the high-pressure chamber 7 and the low-pressure chamber 8. This slow pressure relief not only continuously pushes the piston 2 to the right, allowing the liquid extinguishing agent in the low-pressure chamber 8 on the right side of the piston 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, but also prevents the combustion of excess gas-generating explosive blocks 19 after the fire extinguisher has been completely extinguished, thus preventing the pressure in the high-pressure chamber 7 from continuously increasing. This eliminates the possibility of an explosion and injury caused by excessive pressure in the high-pressure chamber during the later disassembly of the fire extinguisher.

[0018] Example 2: The difference from Example 1 is that the axial piercing needle 6 is fixed on the left side of the rear end cap 3. The axial piercing needle 6 is needle-shaped and the needle tip is aligned with the pressure relief membrane 5.

Claims

1. A pressure relief structure at the net discharge end of a columnar fire extinguisher, comprising a cylinder (1), a piston (2), and a rear end cap (3), wherein the piston (2) is installed in the inner bore of the cylinder (1) in a sealed sliding manner, and the rear end cap (3) is sealed and installed at the right end of the cylinder (1), characterized in that: A coaxial stepped hole is provided between the left and right end faces of the piston (2). The left end of the stepped hole is a threaded hole (21), and the right end is a through hole (22). The diameter of the through hole (22) is smaller than the diameter of the threaded hole (21). A pressure relief membrane (5) is provided at the shoulder between the threaded hole (21) and the through hole (22). A hollow threaded sleeve (4) is provided in the threaded hole (21). The pressure relief membrane (5) is axially sealed by the hollow threaded sleeve (4). An axial piercing needle (6) is provided between the right end face of the piston (2) and the rear end cap (3). The tip of the axial piercing needle (6) is aligned with the pressure relief membrane (5).

2. The pressure relief structure at the net discharge end face of a columnar fire extinguisher according to claim 1, characterized in that: axial... The piercing needle (6) is fixed on the left side of the rear end cap (3). The axial piercing needle (6) is needle-shaped, and the needle tip is aligned with the pressure relief membrane (5).

3. The pressure relief structure at the net discharge end face of a columnar fire extinguisher according to claim 1, characterized in that: The axial piercing needle (6) is fixed on the right side of the piston (2).

4. The pressure relief structure at the net discharge end face of a columnar fire extinguisher according to claim 3, characterized in that: The axial piercing needle (6) includes an elastic connecting piece (61) and an axial needle (62). One end of the elastic connecting piece (61) is fixed to the right end face of the piston (2), and the axial needle (62) is disposed on the other end of the elastic connecting piece (61).

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