An indirect starting mechanism for a fire extinguishing device and its starting method

Abstract

The present invention discloses an indirect starting mechanism for a fire extinguishing device and its starting method. An indirect starting mechanism for a fire extinguishing device includes an indirect starting mechanism cooperating with a main gas generating agent. The indirect starting mechanism includes a starting housing, and a second piston slidably engaged with the starting housing is arranged inside the starting housing. A secondary gas generating agent is arranged between the second piston and the starting housing. This indirect starting mechanism of the present invention enables the fire extinguishing device not to cause a reduction in the spraying pressure of the fire extinguishing agent due to air leakage during the spraying process, greatly improving the energy efficiency of the fire extinguishing device.

Description

Technical Field

[0001] The present invention relates to the field of fire protection technology, and specifically refers to an indirect starting mechanism for a fire extinguishing device and its starting method. Background Art

[0002] At present, many fire extinguishing devices on the market adopt a non-pressurized form. The advantage of this form compared to pressurized fire extinguishing devices is that when the device is in transportation, installation, and normal operation, the device does not carry pressure, which greatly improves the safety performance of the device.

[0003] The non-pressurized fire extinguishing device adopted on the market usually has a gas generating agent loaded inside the fire extinguishing device. When the fire extinguishing device is started, the gas generating agent generates a large amount of gas to push fire extinguishing substances such as dry powder, water, and perfluoromethylcyclohexanone in the fire extinguishing device to spray out of the fire extinguishing device to implement fire extinguishing. However, such devices usually face a problem that the starting method of the gas generating agent generally adopts a thermal fuse and / or an electronic igniter. If the sealing effect of the wire outlet part is not good, a large amount of gas generated by the gas generating agent will spray out from the wire outlet part, thereby reducing the spraying pressure of the fire extinguishing device and the fire extinguishing effect of the fire extinguishing device. To solve this problem, many products adopt to strengthen the sealing of the wire outlet part to reduce the risk of air leakage. However, the actual application environment of the fire extinguishing device may have high temperature, high humidity, salt corrosion, corrosion, etc., resulting in a decrease in the sealing effect. In addition, in addition to the starting wire, the fire extinguishing device may also have a feedback wire entering the device interior. The more wire harnesses entering the device interior, the more likely the sealing function of the device is to fail.

[0004] In the patent 202121860046.2, a thermal conduction method is adopted to start the fire extinguishing device. This method can ensure that after the device is started, the gas generating agent will not leak. However, through the form of thermal conduction, it is difficult to ensure that the heat will be concentrated and transmitted to the gas generating agent and its starting structure, and with the addition of feedback wire harnesses and feedback devices, a certain amount of heat will also be absorbed. In addition, the efficiency of thermal conduction is relatively low compared to direct starting. If a feedback device (thermal fuse resistance) is added at the position of the first fuse, then a situation may occur where the first fuse is started and the feedback device sends a feedback signal, but due to non-concentrated heat conduction, the second fuse is not started, or the gas generating agent fails to start due to aging, then it will provide false signals to people, making people think that the device has been started, resulting in a wrong judgment of the fire situation. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above deficiencies and provide an indirect starting mechanism for a fire extinguishing device and its starting method, so that the fire extinguishing device will not reduce the spraying pressure of the fire extinguishing agent due to air leakage during the spraying process, and improve the energy efficiency of the fire extinguishing device.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: an indirect starting mechanism for a fire extinguishing device, including an indirect starting mechanism cooperating with a main gas generating agent. The indirect starting mechanism includes a starting housing, and a second piston slidably fitted in the starting housing is provided therein. A secondary gas generating agent is provided between the second piston and the starting housing.

[0007] Preferably, one end of the secondary gas generating agent contacts with one end of a first starting wire, and a second starting wire is provided between the second piston and the main gas generating agent.

[0008] Preferably, a detonating powder is provided on the side or top of the second piston, and a friction layer is provided on the inner wall of the starting housing.

[0009] Preferably, the first starting wire is of an electric igniter structure, and the second starting wire is of a thermal fuse structure.

[0010] Preferably, the second piston is of a metal structure, and wires are provided on both sides of the rear end of the starting housing. The wires are connected to a feedback mechanism.

[0011] Preferably, the main gas generating agent is provided in a medicine bin, and the medicine bin communicates with the front end of the starting housing.

[0012] Preferably, an insulating sealing plug is further provided at the rear end of the starting housing.

[0013] In addition, the present invention also discloses a starting method for the indirect starting mechanism of the above fire extinguishing device, which includes the following steps:

[0014] S1: When a fire breaks out outside, the first starting wire ignites the secondary gas generating agent. The secondary gas generating agent burns to generate gas, thereby pushing the second piston in the starting housing to move towards the position where the second starting wire is located;

[0015] S2: During the movement of the second piston, the ignition powder generates heat by friction with the friction layer and is ignited. The ignition powder generates heat and ignites the second starting wire;

[0016] S3: The second starting wire ignites the main gas generating agent. The main gas generating agent burns to generate gas. A part of the gas generated by the main gas generating agent serves as the driving source for the fire extinguishing agent in the fire extinguishing device, so that the fire extinguishing agent is ejected to carry out the fire extinguishing process;

[0017] S4: Another part of the gas generated by the main gas generating agent will reversely enter the starting housing, thereby reversely pushing the second piston to move towards the position where the wire is located, and then connecting the wire and its feedback mechanism, so that the feedback mechanism generates a feedback signal.

[0018] Preferably, in step S3, a part of the gas generated by the main gas generating agent pushes the first piston of the fire extinguishing device towards the spraying part, and the fire extinguishing agent is pressurized and ejected from the spraying part to carry out the fire extinguishing process.

[0019] Preferably, both the main gas generating agent and the secondary gas generating agent are selected as aerosol generating agents, and the fire extinguishing agent is a dry powder fire extinguishing agent or a water-based fire extinguishing agent or a perfluoromethylcyclohexanone fire extinguishing agent.

[0020] Advantages of the present invention:

[0021] 1. This indirect starting mechanism of the present invention enables the fire extinguishing device not to reduce the fire extinguishing agent spraying pressure due to air leakage during the spraying process, greatly improving the energy efficiency of the fire extinguishing device.

[0022] 2. When the second piston in the present invention moves in the reverse direction and contacts the wire, the circuit where the feedback mechanism is located will be connected, so that the corresponding alarm will sound, providing people with an accurate judgment; and in the present invention, the second piston will only move in the reverse direction and contact the wire when the main gas generating agent is ignited to generate gas with a reverse thrust, and there will be no phenomenon that the feedback mechanism works erroneously due to the main gas generating agent not being ignited and started.

[0023] 3. This indirect starting (or multi-stage starting) method in the present invention greatly reduces the requirements for the sealing performance of the starting mechanism. Since the volume of the indirect starting structure is much smaller than that of the fire extinguishing device, a conventional sealing structure can effectively prevent the influence of air leakage on the piston pushing. Description of the drawings

[0024] Figure 1 It is a schematic cross-sectional structure diagram of an indirect starting mechanism;

[0025] Figure 2 It is a schematic three-dimensional structure diagram of a fire extinguishing device with an indirect starting mechanism;

[0026] Figure 3 For Figure 2 front view structure diagram;

[0027] Figure 4 For Figure 3 B-B cross-sectional structure diagram. Specific embodiments

[0028] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0029] Embodiment 1: As Figure 1 shown, an indirect starting mechanism of a fire extinguishing device includes an indirect starting mechanism 7 cooperating with a main gas generating agent 6. The indirect starting mechanism 7 includes a starting housing 7.1. A second piston 7.2 slidably matched with the starting housing 7.1 is arranged in the starting housing 7.1, and a secondary gas generating agent 7.3 is arranged between the second piston 7.2 and the starting housing 7.1.

[0030] Preferably, the secondary gas generator 7.3 is in contact with one end of the first starting wire 7.4, and a second starting wire 7.5 is provided between the second piston 7.2 and the main gas generator 6.

[0031] Preferably, an igniter 7.6 is provided on the side or top of the second piston 7.2, and a friction layer 7.7 is provided on the inner wall of the starting housing 7.1. In this embodiment, after the igniter 7.6 and the friction layer 7.7 move relative to each other, the igniter 7.6 will be ignited, similar to the way a match head rubs against the side wall of a matchbox.

[0032] Preferably, the first starting wire 7.4 is of an electric igniter structure, and the second starting wire 7.5 is of a thermal wire structure. In this embodiment, when the first starting wire 7.4 is of an electric igniter structure, it is connected to a fire detection device. The fire detection device is a temperature sensor and / or a smoke sensor. When a fire, overheating or other situations occur, after the fire detection device detects a high-temperature environment caused by the fire externally, it sends a signal to the microprocessor, and the microprocessor controls the first starting wire 7.4 to ignite the secondary gas generator 7.3. And the second starting wire 7.5 is of a thermal wire structure. After the igniter 7.6 is ignited, it can directly ignite the second starting wire 7.5, and finally directly ignite the main gas generator 6.

[0033] Preferably, the second piston 7.2 is of a metal structure, and wires 7.8 are provided on both sides at the rear end of the starting housing 7.1. The wires 7.8 are connected to a feedback mechanism. In this embodiment, the feedback mechanism can adopt an alarm. When the second piston 7.2 moves in the reverse direction and contacts the wires 7.8, the circuit where the feedback mechanism is located will be connected, so that the corresponding alarm will sound, providing people with an accurate judgment; and in the present invention, the second piston 7.2 will only move in the reverse direction and contact the wires 7.8 when the main gas generator 6 is ignited and generates gas with a reverse thrust, and there will be no phenomenon that the feedback mechanism works erroneously due to the main gas generator 6 not being ignited and started.

[0034] Preferably, the main gas generator 6 is arranged in the medicine bin 13, and the medicine bin 13 is communicated with the front end of the starting housing 7.1.

[0035] Preferably, an insulating sealing plug 7.9 is further provided at the rear end of the starting housing 7.1. The insulating sealing plug 7.9 in this embodiment is made of a non-metallic material, which can prevent the indirect starting structure 7 from getting water, leaking air and short-circuiting. Since the volume of the indirect starting structure 7 is much smaller than that of the fire extinguishing device, a conventional sealing structure can effectively prevent the influence of air leakage on the pushing of the first piston 4.

[0036] Embodiment 2: The present invention also discloses a starting method for the indirect starting mechanism of the above fire extinguishing device, which includes the following steps:

[0037] S1: When a fire breaks out outside, the first activation wire 7.4 ignites the secondary gas generator 7.3. The secondary gas generator 7.3 burns to produce gas, thereby pushing the second piston 7.2 in the activation housing 7.1 towards the position where the second activation wire 7.5 is located;

[0038] S2: During the movement of the second piston 7.2, the ignition charge 7.6 generates heat by friction with the friction layer 7.7 and is ignited. The ignition charge 7.6 generates heat and ignites the second activation wire 7.5;

[0039] S3: The second activation wire 7.5 ignites the main gas generator 6. The main gas generator 6 burns to produce gas. A part of the gas generated by the main gas generator 6 serves as the driving source for the fire extinguishing agent in the fire extinguishing device, causing the fire extinguishing agent to be ejected for the fire extinguishing process;

[0040] S4: Another part of the gas generated by the main gas generator 6 will enter the activation housing 7.1 in the reverse direction, thereby pushing the second piston 7.2 in the reverse direction towards the position where the wire 7.8 is located, and then connecting the wire 7.8 and its feedback mechanism, so that the feedback mechanism generates a feedback signal.

[0041] Preferably, in step S3, a part of the gas generated by the main gas generator 6 pushes the first piston 4 of the fire extinguishing device towards the spraying part. The fire extinguishing agent is pressurized and ejected from the spraying part for the fire extinguishing process. This method is to push the first piston to move by the gas generated by the main gas generator 6, and then push the fire extinguishing agent to eject through the first piston. The specific implementation methods can be seen in Embodiments 3 and 4.

[0042] Preferably, both the main gas generator 6 and the secondary gas generator 7.3 are selected as aerosol generators, and the fire extinguishing agent is a dry powder fire extinguishing agent or a water-based fire extinguishing agent or a perfluorohexanone fire extinguishing agent. After the main gas generator 6 and the secondary gas generator 7.3 are selected as aerosol generators, a large amount of aerosol or gas can be generated after they are ignited, thereby providing thrust for the ejection of the fire extinguishing agent.

[0043] Embodiment 3: As Figures 2-4 shown, the fire extinguishing device applying the above indirect activation mechanism disclosed by the present invention includes a cylinder body 1. A spraying part 3 is provided at the front end of the cylinder body 1. A first piston 4 slidably matched with the cylinder body 1 is arranged in the cylinder body 1. A fire extinguishing agent 5 is arranged between the first piston 4 and the spraying part 3. A main gas generator 6 and an indirect activation mechanism 7 cooperating with the main gas generator 6 are arranged between the first piston 4 and the rear end of the cylinder body 1. The indirect activation mechanism 7 includes an activation housing 7.1. A second piston 7.2 slidably matched with the activation housing 7.1 is arranged in the activation housing 7.1. A secondary gas generator 7.3 is arranged between the second piston 7.2 and the activation housing 7.1.

[0044] Preferably, the spraying part 3 includes a front end cover 3.1 provided at the front end of the cylinder body 1. A spraying hole 3.2 is formed in the front end cover 3.1, and a nozzle diaphragm 3.3 is provided in the spraying hole 3.2; on one side of the nozzle diaphragm 3.3, there is a nozzle bolt 3.4 threadedly engaged with the spraying hole 3.2, and on the other side, there is a PTFE gasket 3.5. A channel is formed in the nozzle bolt 3.4. In the above structure, the nozzle diaphragm 3.3 can be installed in the spraying hole 3.2 through the nozzle bolt 3.4, and the installation method is simple. At the same time, by setting the PTFE gasket 3.5, the sealing performance at the nozzle bolt 3.4 can be ensured; the nozzle diaphragm 3.3 in this embodiment can play a sealing role before the fire extinguishing device is activated, preventing the fire extinguishing agent 5 from absorbing moisture or escaping. After the fire extinguishing device is activated, the nozzle diaphragm 3.3 is crushed under pressure, enabling the fire extinguishing agent 5 to be normally sprayed out from the spraying hole 3.2.

[0045] Preferably, the front end of the cylinder body 1 is threadedly connected to the front end cover 3.1, the rear end of the cylinder body 1 is threadedly connected to the rear end cover 2, and a filling hole 8 is further formed in the front end cover 3.1, and a plug 9 threadedly engaged with it is provided in the filling hole 8. After setting the filling hole 5 at the front end cover 3.1, it is convenient to fill the fire extinguishing agent 5 after manufacturing. Just unscrew the plug 9, fill the fire extinguishing agent 5 into the fire extinguishing device, and then install the plug 9. The whole process improves the filling efficiency.

[0046] Preferably, a bursting diaphragm 10 is provided on the surface of the first piston 4, and a piston seal ring 11 and a wear-resistant ring 12 are provided between the side surface of the first piston 4 and the inner side of the cylinder body 1. After setting the bursting diaphragm 10, when the first piston 4 suddenly gets stuck during movement, the air pressure on one side of the first piston 4 will suddenly increase. At this time, it is necessary to relieve the pressure in time, otherwise there will be a risk of explosion. At this time, the bursting diaphragm 10 will play a role in relieving the pressure. When the pressure reaches a certain value, the bursting diaphragm 10 will rupture, enabling the gas to be relieved in time from this position; after setting the piston seal ring 11, the airtightness of the first piston 4 during movement can be ensured, preventing air leakage. After setting the wear-resistant ring 12 (which can be made of hard material), the friction between the first piston 4 and the inner side of the cylinder body 1 can be greatly reduced, making its sliding smoother.

[0047] Embodiment 4: The fire extinguishing method of the above fire extinguishing device of the present invention includes the following steps:

[0048] S1: When a fire breaks out outside, the first activation wire 7.4 ignites the secondary gas-generating agent 7.3, and the secondary gas-generating agent 7.3 burns to generate gas, thereby pushing the second piston 7.2 in the activation housing 7.1 to move towards the position where the second activation wire 7.5 is located;

[0049] S2: During the movement of the second piston 7.2, the ignition charge 7.6 generates heat through friction with the friction layer 7.7 and is ignited. The ignition charge 7.6 generates heat and ignites the second starting wire 7.5;

[0050] S3: The second starting wire 7.5 ignites the main gas generating agent 6. The main gas generating agent 6 burns to produce gas. A part of the gas generated by the main gas generating agent 6 pushes the first piston 4 towards the spraying part 3. The fire extinguishing agent 5 is pressurized and sprayed out from the spraying part 3 to carry out the fire extinguishing process;

[0051] S4: Another part of the gas generated by the main gas generating agent 6 will reversely enter the starting housing 7.1, thereby reversely pushing the second piston 7.2 towards the position where the wire 7.8 is located, and then connecting the wire 7.8 and its feedback mechanism, so that the feedback mechanism generates a feedback signal.

[0052] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. The embodiments in this application and the features in the embodiments can be arbitrarily combined with each other without conflict. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. An indirect starting mechanism for a fire extinguishing device, comprising an indirect starting mechanism (7) cooperating with a main gas generating agent (6). Characterized in that: The indirect starting mechanism (7) includes a starting housing (7.1), and a second piston (7.2) slidably fitted therein. A secondary gas generating agent (7.3) is provided between the second piston (7.2) and the starting housing (7.1). One end of the secondary gas generating agent (7.3) is in contact with a first starting wire (7.4), and a second starting wire (7.5) is provided between the second piston (7.2) and the main gas generating agent (6). A detonating charge (7.6) is provided on the side or top of the second piston (7.2), and a friction layer (7.7) is provided on the inner wall of the starting housing (7.1). The first starting wire (7.4) is of an electric igniter structure, and the second starting wire (7.5) is of a thermal sensitive wire structure.

2. An indirect starting mechanism for a fire extinguishing device according to claim 1, Characterized in that: The second piston (7.2) is of a metal structure, and wires (7.8) are provided on both sides at the rear end of the starting housing (7.1). The wires (7.8) are connected to a feedback mechanism.

3. An indirect starting mechanism for a fire extinguishing device according to claim 1, Characterized in that: The main gas generating agent (6) is provided in a chemical agent bin (13), and the chemical agent bin (13) is communicated with the front end of the starting housing (7.1).

4. An indirect starting mechanism for a fire extinguishing device according to claim 1, Characterized in that: An insulating sealing plug (7.9) is further provided at the rear end of the starting housing (7.1).

5. A starting method for the indirect starting mechanism of the fire extinguishing device according to any one of claims 1 to 4, Characterized in that: It includes the following steps: S1: When a fire breaks out in the outside world, the first starting wire (7.4) ignites the secondary gas generating agent (7.3), and the secondary gas generating agent (7.3) burns to generate gas, thereby pushing the second piston (7.2) in the starting housing (7.1) to move towards the position where the second starting wire (7.5) is located. S2: During the movement of the second piston (7.2), the detonating charge (7.6) generates heat by friction with the friction layer (7.7) and is ignited, and the detonating charge (7.6) generates heat to ignite the second starting wire (7.5). S3: The second starting wire (7.5) ignites the main gas generating agent (6), and the main gas generating agent (6) burns to generate gas. A part of the gas generated by the main gas generating agent (6) serves as the driving source for the fire extinguishing agent in the fire extinguishing device, so that the fire extinguishing agent is ejected to carry out the fire extinguishing process. S4: Another part of the gas generated by the main gas generating agent (6) will reversely enter the starting housing (7.1), thereby reversely pushing the second piston (7.2) to move towards the position where the wire (7.8) is located, and then connecting the wire (7.8) and its feedback mechanism, so that the feedback mechanism generates a feedback signal.

6. A starting method for the indirect starting mechanism of the fire extinguishing device according to claim 5, Characterized in that: In step S3, a part of the gas generated by the main gas generating agent (6) pushes the first piston (4) of the fire extinguishing device towards the spraying part, and the fire extinguishing agent is pressurized and ejected from the spraying part to carry out the fire extinguishing process.

7. The starting method of the indirect starting mechanism of the fire extinguishing device according to claim 6, characterized in that: both the main gas generating agent (6) and the secondary gas generating agent (7.3) are selected as aerosol generating agents, and the fire extinguishing agent is a dry powder fire extinguishing agent or a water-based fire extinguishing agent or a perfluoromethylcyclohexanone fire extinguishing agent.

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