Anti-pressure-relief mechanism and aerosol fire extinguishing device

Abstract

The utility model discloses a pressure relief prevention mechanism and an aerosol fire extinguishing device. The pressure relief prevention mechanism comprises an elastic sealing plug, a second threading hole is formed in the middle of the sealing plug, the pressure relief prevention mechanism further comprises a fusible supporting body, the fusible supporting body is placed in the second threading hole, and the thermosensitive wire penetrates through the first threading hole of the fusible supporting body. According to the utility model, the fusible support body is arranged between the sealing plug and the thermosensitive wire, and the thermosensitive wire is not extruded under the protection of the fusible support body before combustion, so that the problems that internal powder is dispersed and combustion is easy to stop are avoided, and the stability is improved; when the thermosensitive wire burns to the inside of the sealing plug, the fusible support body automatically melts, and the sealing plug restores to the original shape by virtue of self elasticity, so that sealing is realized, pressure leakage is prevented, and directional spraying is realized.

Description

Technical Field

[0001] The utility model belongs to the field of fire protection, and in particular relates to an anti-pressure relief mechanism and an aerosol fire extinguishing device. Background Art

[0002] Aerosol fire extinguishing device is a special fire extinguishing device that uses ignitable aerosol as a fire extinguishing agent. This aerosol will produce inert gas when burning, thereby achieving the purpose of fire extinguishing. In aerosol fire extinguishing device, a thermal wire is usually used to ignite the fire extinguishing agent. The thermal wire contains a powder core. When the ambient temperature reaches 170℃, the thermal wire will be ignited and burn into the fire extinguishing device.

[0003] In practical applications, aerosol fire extinguishing devices still have some technical problems: since aerosol fire extinguishing devices require directional spraying, anti-pressure relief measures must be taken at the location where the thermal wire enters the fire extinguishing device. The anti-pressure relief measures in the prior art are to use the thermal wire to pass through the sealing plug, relying on the squeezing force of the sealing plug on the thermal wire to prevent pressure relief at the thermal wire. However, the powder core inside the thermal wire that has been squeezed by the sealing plug for a long time will disperse, making it difficult for the thermal wire to conduct heat at the sealing plug, and eventually causing the thermal wire to stop burning at this location, so that the aerosol fire extinguishing agent cannot be ignited, affecting the normal operation and fire extinguishing efficiency of the fire extinguishing device. Utility Model Content

[0004] The utility model provides an anti-pressure relief mechanism and an aerosol fire extinguishing device, the purpose of which is to solve the problem that the existing sealed anti-pressure relief mechanism easily causes the thermal sensitive wire to stop burning.

[0005] The technical solution of this utility model is as follows:

[0006] A pressure relief mechanism comprises an elastic sealing plug, wherein a second threading hole is arranged in the middle of the sealing plug, and a fusible support body is arranged in the second threading hole, and the thermistor wire passes through the first threading hole of the fusible support body.

[0007] As a further improvement of the anti-pressure relief mechanism: it also includes a fixing member, and the sealing plug is installed in the cavity of the fixing member.

[0008] As a further improvement of the anti-pressure relief mechanism: the outer diameter of the sealing plug is greater than or equal to the inner diameter of the cavity of the fixing member.

[0009] As a further improvement of the anti-pressure relief mechanism: the inner diameter of the second threading hole is smaller than the diameter of the thermal sensitive wire.

[0010] As a further improvement of the anti-pressure relief mechanism: the inner diameter of the first threading hole is greater than or equal to the diameter of the thermistor wire.

[0011] As a further improvement of the anti-pressure relief mechanism: the fusible support is a tin-bismuth alloy.

[0012] The utility model also discloses an aerosol fire extinguishing device, which comprises the above-mentioned anti-pressure relief mechanism and a cylindrical shell;

[0013] The upper end of the shell is provided with a top cover, and a mounting hole is opened at the center of the top cover; the fixing member is installed at the mounting hole;

[0014] Aerosol fire extinguishing agent is arranged in the shell, and a spray port is arranged at the bottom of the shell.

[0015] As a further improvement of the aerosol fire extinguishing device: the fixing piece is a fixing screw plug, the lower end of the fixing screw plug is threadedly matched with the mounting hole, and the top of the fixing screw plug is provided with a third threading hole for the thermal sensitive wire to pass through.

[0016] Compared with the prior art, the utility model has the following positive effects:

[0017] 1. The utility model sets a fusible support body between the sealing plug and the thermistor wire. Before the thermistor wire burns, it is not squeezed under the protection of the fusible support body, thus avoiding the problem of internal powder dispersion and easy combustion stopping, and improving stability. When the thermistor wire burns to the inside of the sealing plug, the fusible support body automatically melts, and the sealing plug relies on its own elasticity to restore its original state and achieve sealing, thereby preventing pressure leakage.

[0018] 2. The utility model has a simple structure and can realize a stable and highly reliable directional spraying fire extinguishing function. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an exploded view of the aerosol fire extinguishing device of the utility model, in which the second threading hole of the sealing plug is in an open state;

[0020] Figure 2 This is a front view of the aerosol fire extinguishing device in the utility model;

[0021] Figure 3 for Figure 2 AA view;

[0022] Figure 4 for Figure 3 A partial enlarged view of part B.

[0023] Reference numerals:

[0024] 1. Shell, 11. Mounting hole, 2. Fusible alloy ring, 21. First threading hole, 3. Sealing plug, 31. Second threading hole, 4. Fixing screw plug, 41. Second threading hole, 5. Thermosensitive wire, 6. Aerosol fire extinguishing agent. DETAILED DESCRIPTION

[0025] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments.

[0026] like Figures 1 to 4 , an aerosol fire extinguishing device with an anti-pressure relief mechanism, including the anti-pressure relief mechanism, and also including a shell 1 and an aerosol fire extinguishing agent 6.

[0027] The anti-pressure relief mechanism comprises a fusible support 2, a sealing plug 3 and a fixing member.

[0028] The sealing plug 3 is made of high-ignition-point silicone rubber with a hardness of 75HA and elasticity. A second threading hole 31 with a small diameter is provided in the middle of the sealing plug 3. The inner diameter of the second threading hole 31 in a natural state can be considered to be 0.

[0029] The fusible support 2 is placed in the second threading hole 31, and the fusible support 2 is provided with a first threading hole 21 for the thermistor wire 5 to pass through. The fusible support 2 is made of tin-bismuth alloy, with a melting point lower than 100 degrees Celsius, and is converted from solid to liquid after reaching the melting point. The hardness of the fusible support 2 in the solid state is greater than the hardness of the sealing plug 3, and the inner diameter of the first threading hole 21 is greater than or equal to the diameter of the thermistor wire 5, ensuring that the thermistor wire 5 will not be squeezed by the sealing plug 3 in the solid state.

[0030] The shell 1 is cylindrical, and the upper end of the shell 1 is provided with a top cover, and the center of the top cover is provided with a mounting hole 11. The shell 1 is provided with an aerosol fire extinguishing agent 6, and the bottom of the shell 1 is provided with a spray port.

[0031] Further, the sealing plug 3 is installed in the cavity of the fixing member. In this embodiment, the fixing member is a fixing screw plug 4. The top of the fixing screw plug 4 is provided with a third threading hole 41 for the thermal sensitive wire 5 to pass through. The outer diameter of the sealing plug 3 is greater than or equal to the inner diameter of the cavity of the fixing screw plug 4. The lower end of the fixing screw plug 4 is threadedly matched with the mounting hole 11.

[0032] When the aerosol fire extinguishing device is not triggered, the fusible support body 2 passes through and props up the second threading hole 31 of the sealing plug 3. Since the hardness of the fusible support body 2 is greater than that of the sealing plug 3 and the inner diameter of the first threading hole 21 is greater than or equal to the diameter of the thermal wire 5, the thermal wire 5 will not be squeezed by the sealing plug 3, and the thermal wire will not be dispersed.

[0033] When the thermistor wire 5 is triggered by high temperature and burns to the position of the fusible support 2, the temperature generated by the combustion is greater than 100°C, the fusible support 2 reaches the melting point, the fusible support 2 is converted from solid to liquid, and the sealing plug 3 is gradually no longer supported by the fusible support 2. When the thermistor wire 5 burns to the inside of the aerosol fire extinguishing device, the aerosol fire extinguishing agent 6 is ignited, generating inert gases such as carbon dioxide and nitrogen, and the pressure in the inner cavity of the shell 1 increases. At this time, the fusible support 2 has completely become liquid, the sealing plug 3 has returned to its original state, and the third threading hole 41 is blocked to avoid pressure relief at the inlet, thereby realizing the directional spraying function of the aerosol fire extinguishing device.

[0034] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. The scope of the present invention is defined by the claims rather than the above description.

Claims

1. A pressure relief prevention mechanism, comprising an elastic sealing plug (3), wherein a second threading hole (31) is provided in the middle of the sealing plug (3), characterized in that: The anti-pressure relief mechanism further comprises a fusible support body (2), wherein the fusible support body (2) is placed in the second threading hole (31), and the thermal sensitive wire (5) passes through the first threading hole (21) of the fusible support body (2).

2. The pressure relief prevention mechanism according to claim 1, characterized in that: It also includes a fixing piece, wherein the sealing plug (3) is installed in a cavity of the fixing piece.

3. The pressure relief prevention mechanism according to claim 2, characterized in that: The outer diameter of the sealing plug (3) is greater than or equal to the inner diameter of the cavity of the fixing member.

4. The anti-pressure relief mechanism according to claim 1, characterized in that: The inner diameter of the second threading hole (31) is smaller than the diameter of the thermal sensitive wire (5).

5. The anti-pressure relief mechanism according to claim 1, characterized in that: The inner diameter of the first threading hole (21) is greater than or equal to the diameter of the thermal sensitive wire (5).

6. The anti-pressure relief mechanism according to claim 1, characterized in that: The fusible support (2) is a tin-bismuth alloy.

7. An aerosol fire extinguishing device, characterized in that: It comprises the anti-pressure relief mechanism as claimed in claim 2 or 3, and also comprises a cylindrical housing (1); The upper end of the shell (1) has a top cover, and a mounting hole (11) is opened at the center of the top cover; the fixing member is mounted at the mounting hole (11); An aerosol fire extinguishing agent (6) is arranged in the shell (1), and a spray port is arranged at the bottom of the shell (1).

8. The aerosol fire extinguishing device according to claim 7, characterized in that: The fixing member is a fixing screw plug (4), the lower end of the fixing screw plug (4) is threadably matched with the mounting hole (11), and the top of the fixing screw plug (4) is provided with a third threading hole (41) for the thermal sensitive wire (5) to pass through.

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