Pulse-type fire extinguishing device using liquid extinguishing agent, and fire extinguishing method

Abstract

A pulse-type fire extinguishing device using a liquid fire extinguishing agent, and a fire extinguishing method. The device comprises an outer cylinder (1) and a gas-producing fire extinguishing agent (2) arranged in the outer cylinder, wherein a front cover (3) is provided on the front side of the outer cylinder, and an inner expelling opening (4) is provided in the surface of the front cover; an end surface of the gas-producing fire extinguishing agent is connected to one end of an actuating component (5); a first piston (7) is provided in the outer cylinder, the first piston is slidably connected to rotary rod (6), and the top of the rotary rod is fixedly connected to the center of a rotary cover (8); an external thread (6.1) is provided on the upper side of the rotary rod, and the external thread meshes with an internal thread on an inner ring of the first piston; an outer expelling opening (9) cooperating with the inner expelling opening is provided in the surface of the rotary cover; the inner expelling opening is fixedly connected to the top of an inner cylinder (10), the outer surface of the inner cylinder is slidably connected to the first piston, and a second piston (11) is provided on the lower side of the interior of the inner cylinder; a flexible pouch (12) having a liquid fire extinguishing agent wrapped therein is provided on the upper side of the second piston; an inner pressure-relief hole (13) is provided in the surface of the front cover; and an outer pressure-relief hole (14) cooperating with the inner pressure-relief hole is provided in the surface of the rotary cover. The penetrating capacity of a liquid fire extinguishing agent can be improved, and thus the liquid fire extinguishing agent can penetrate through a flame to reach the root thereof, thereby improving the fire extinguishing capacity.

Description

Pulse fire extinguishing device and fire extinguishing method using liquid fire extinguishing agent Technical Field

[0001] The present invention relates to the technical field of pulse fire extinguishing, and in particular to a pulse fire extinguishing device and a fire extinguishing method using a liquid fire extinguishing agent. Background Art

[0002] Pulse aerosol fire extinguishing devices have been widely used due to their advantages such as small size, pressure-free storage, no need for laying pipes and maintenance, high fire extinguishing efficiency, non-toxicity, safety and reliability, and environmental protection. For example, CN210612735U - a pulse aerosol fire extinguishing device, can instantly extinguish flames, thereby quickly extinguishing flames in the first place; however, in pulse fire extinguishing devices, when the fire extinguishing agent is a liquid fire extinguishing agent, the liquid fire extinguishing agent and other fire extinguishing agents have a small mass and low inertia, so the fire extinguishing agent is difficult to penetrate the flame and reach the root of the flame, and often evaporates and dissipates before reaching the root of the flame, which will weaken the fire extinguishing ability of the pulse fire extinguishing device. Technical issues

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a pulse fire extinguishing device and fire extinguishing method using liquid fire extinguishing agent, which can increase the penetration ability of the liquid fire extinguishing agent, so that it can penetrate the flame and reach the root of the flame, thereby improving the fire extinguishing ability. Technical Solutions

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a pulse fire extinguishing device using liquid fire extinguishing agent, comprising an outer cylinder and a gas-generating fire extinguishing agent arranged in the outer cylinder, a front cover is provided on the front side of the outer cylinder, an inner nozzle is provided on the surface of the front cover, and the end face of the gas-generating fire extinguishing agent is connected to one end of the starting component, the outer cylinder is provided with a first piston which slides with the first piston, the first piston is slidably connected to the rotating rod, the top of the rotating rod is fixedly connected to the center of the rotating cover, the upper side of the rotating rod is provided with an external thread, the external thread is matched with the internal thread of the inner ring of the first piston, the surface of the rotating cover is provided with an external nozzle which matches with the inner nozzle, the inner nozzle is fixedly connected to the top of the inner cylinder, the outer surface of the inner cylinder is slidably connected with the first piston, the lower side of the inner cylinder is provided with a second piston which slides with the second piston, and the upper side of the second piston is provided with a flexible bag body which wraps the liquid fire extinguishing agent, the surface of the front cover is provided with an inner pressure relief hole, and the surface of the rotating cover is provided with an outer pressure relief hole which matches with the inner pressure relief hole.

[0005] Preferably, the front side of the outer cylinder is threadedly connected to the front cover, and the rear side is threadedly connected to the rear cover. The top of the rotating rod is rotatably connected to the center of the front cover through a bearing, and the bottom is rotatably connected to the center of the rear cover through a bearing.

[0006] Preferably, when the inner nozzle opened on the front cover surface and the outer nozzle opened on the rotating cover surface overlap, the inner pressure relief hole opened on the front cover surface and the outer pressure relief hole opened on the rotating cover surface are staggered, and the upper surface of the front cover and the lower surface of the rotating cover are in contact.

[0007] Preferably, the gas-generating fire extinguishing agent is an aerosol generating agent, and the liquid fire extinguishing agent wrapped in the flexible bag is a perfluorohexanone fire extinguishing agent.

[0008] Preferably, the gas-generating fire extinguishing agent is a columnar structure formed by pressing aerosol generating agent powder.

[0009] Preferably, the starting component is an electric ignition head or a thermal wire structure.

[0010] Preferably, the gas-generating fire extinguishing agent is located in the area where the back cover is located, and a silica gel layer is provided between the outer surface of the gas-generating fire extinguishing agent and the inner surface of the back cover.

[0011] Preferably, the number of the outer nozzles, the inner nozzles and the corresponding inner cylinders are multiple, and the number of the outer pressure relief holes and the corresponding inner pressure relief holes are multiple.

[0012] In addition, the present invention also discloses a fire extinguishing method using the pulse-type fire extinguishing device using a liquid fire extinguishing agent, which comprises the following steps:

[0013] S1: When the fire extinguishing device is not activated, the inner nozzle and the outer nozzle are staggered, while the inner pressure relief hole and the outer pressure relief hole are overlapped;

[0014] S2: When a fire occurs, the starting component ignites the gas-generating fire extinguishing agent, which produces gas;

[0015] S3: Since the inner and outer pressure relief holes overlap, the airflow can push the first piston to move along the rotating rod to the position of the front cover; however, the inner and outer nozzles are staggered, and the top of the inner cylinder is closed. The airflow can only push the second piston upward for a certain distance, after which the second piston stops moving.

[0016] S4: During the period when the first piston moves toward the position of the front cover, the pressure in the space between the first piston and the gas-generating fire extinguishing agent in the outer cylinder and the air area in the inner cylinder gradually increases, forming a pressure-holding process;

[0017] S5: When the first piston moves to the upper side of the rotating rod, the external thread on the upper side of the rotating rod cooperates with the internal thread of the inner ring of the first piston, so that the rotating rod rotates a certain angle, and finally the inner nozzle and the outer nozzle are overlapped, and the top of the inner cylinder is open;

[0018] S6: Under the action of internal high pressure, the second piston pushes the flexible bag to move rapidly toward the inner nozzle and the outer nozzle, and finally the second piston and the flexible bag are quickly ejected from the inner nozzle and the outer nozzle. The flexible bag carrying the liquid fire extinguishing agent directly reaches the fire extinguishing area. After rupture, the liquid fire extinguishing agent performs a rapid fire extinguishing process to put out the flames.

[0019] Furthermore, the method further comprises the following steps:

[0020] S7: After the second piston is ejected from the inner nozzle and the outer nozzle, the gaseous fire extinguishing substance produced by the gas-generating fire extinguishing agent is also ejected from the inner cylinder, the inner nozzle and the outer nozzle, thereby suppressing the fire extinguishing process in the fire extinguishing area and preventing the flame from reigniting. Beneficial effects

[0021] Beneficial effects of the present invention:

[0022] The present invention can gradually increase the pressure in the space area between the first piston and the gas-generating fire extinguishing agent in the outer cylinder and the air area in the inner cylinder during the period when the first piston moves toward the position of the front cover, forming a pressure-holding process; after the pressure is held, the second piston can push the flexible bag body to quickly spray toward the inner nozzle and the outer nozzle under the action of the internal high pressure, so that the flexible bag body carrying the liquid fire extinguishing agent directly reaches the fire extinguishing area, and after rupture, the liquid fire extinguishing agent performs a rapid fire extinguishing process to extinguish the flame. The above process increases the penetration ability of the liquid fire extinguishing agent, enabling it to penetrate the flame and reach the root of the flame, thereby improving the fire extinguishing ability; and when the second piston is sprayed from the inner nozzle and the outer nozzle, the gaseous fire extinguishing substance generated by the gas-generating fire extinguishing agent is also sprayed from the inner cylinder, the inner nozzle and the outer nozzle, thereby suppressing the fire extinguishing process in the fire extinguishing area and preventing the flame from reigniting. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic diagram of the internal structure of a pulse-type fire extinguishing device using a liquid fire extinguishing agent;

[0024] FIG2 is a schematic diagram of the structure of the connection between the rotating rod and the rotating cover in FIG1 ;

[0025] FIG3 is a schematic diagram of the three-dimensional structure of a pulse fire extinguishing device using a liquid fire extinguishing agent. Modes for Carrying Out the Invention

[0026] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0027] As shown in Figures 1 to 3, a pulse fire extinguishing device using a liquid fire extinguishing agent includes an outer tube 1 and a gas-generating fire extinguishing agent 2 arranged in the outer tube 1. A front cover 3 is provided on the front side of the outer tube 1, and an inner nozzle 4 is opened on the surface of the front cover 3. The end face of the gas-generating fire extinguishing agent 2 is connected to one end of the starting component 5. A first piston 7 is provided in the outer tube 1 to slide with it. The first piston 7 is slidably connected to the rotating rod 6. The top of the rotating rod 6 is fixedly connected to the center of the rotating cover 8. The upper side of the rotating rod 6 is provided with an external thread 6.1, and the external thread 6.1 is connected to the rotating rod 6. The internal thread of the inner ring of the first piston 7 is matched, and the surface of the rotating cover 8 is provided with an external nozzle 9 that cooperates with the inner nozzle 4. The inner nozzle 4 is fixedly connected to the top of the inner cylinder 10, and the outer surface of the inner cylinder 10 is slidably connected to the first piston 7. The lower side of the inner cylinder 10 is provided with a second piston 11 that slides with it, and the upper side of the second piston 11 is provided with a flexible bag body 12 that wraps the liquid fire extinguishing agent. The surface of the front cover 3 is provided with an internal pressure relief hole 13, and the surface of the rotating cover 8 is provided with an external pressure relief hole 14 that cooperates with the internal pressure relief hole 13.

[0028] Preferably, the front side of the outer cylinder 1 is threadedly connected to the front cover 3, and the rear side is threadedly connected to the rear cover 15. The top of the rotating rod 6 is rotatably connected to the center of the front cover 3 via a bearing, and the bottom is rotatably connected to the center of the rear cover 15 via a bearing. This threaded connection improves the ease of installation of the entire fire extinguishing device and facilitates the production process. The bearings also facilitate rotation of the rotating rod 6 when the first piston 7 moves to the upper side of the rotating rod 6, as the external threads 6.1 on the upper side of the rotating rod 6 mate with the internal threads of the inner ring of the first piston 7.

[0029] Preferably, when the inner nozzle 4 opened on the surface of the front cover 3 and the outer nozzle 9 opened on the surface of the rotating cover 8 overlap, the inner pressure relief hole 13 opened on the surface of the front cover 3 and the outer pressure relief hole 14 opened on the surface of the rotating cover 8 are staggered, and the upper surface of the front cover 3 and the lower surface of the rotating cover 8 are in contact.

[0030] Preferably, the gas-generating fire extinguishing agent 2 is an aerosol generator, and the liquid fire extinguishing agent enclosed in the flexible bag 12 is perfluorohexanone fire extinguishing agent. In this embodiment, the aerosol generator generates a large amount of gas when burned, thereby driving the first piston 7. The liquid fire extinguishing agent is perfluorohexanone fire extinguishing agent, which has a boiling point of 49°C and is a good liquid fire extinguishing agent. Furthermore, the flexible bag 12 can be a plastic bag.

[0031] Preferably, the gas-generating fire extinguishing agent 2 is a columnar structure formed by pressing aerosol generating agent powder. The aerosol generating agent pressed into a columnar structure burns more slowly than the powdered aerosol generating agent, which can ensure the continuous release of the fire extinguishing agent.

[0032] The aerosol generator is a prior art, for example, the invention patent disclosed in Chinese Patent Publication No. CN101745195B is "An aging-resistant aerosol generator and its preparation process", which discloses that the aerosol generator is composed of an oxidant, a reducing agent, and a binder. The oxidant is potassium nitrate, the binder is phenolic resin, and the reducing agent is melamine. The mass percentages thereof are: potassium nitrate 74% to 80%, phenolic resin 8% to 15%, and the balance is melamine.

[0033] Its preparation method is:

[0034] Step 1: dissolving phenolic resin in ethanol to prepare a phenolic resin solution with a mass concentration of 40% to 55%;

[0035] Step 2: Grind the oxidizing agent and reducing agent to a fineness of 80-200 standard mesh, mix them according to the required proportion, and sieve them through 80-200 mesh three times to make them evenly mixed;

[0036] Step 3: Then add the phenolic resin solution to the mixed powder, stir for 10 minutes, and then use a 40-mesh screen to force granulate. Then dry the agent in an environment with a temperature of 40°C and a relative humidity of less than 20% until the volatile components are less than 1%;

[0037] Step 4: The dried medicine is pressed under a pressure of 10 MPa to form an aerosol generating agent column structure.

[0038] Preferably, the starting component 5 is an electric ignition head or a thermal wire structure. When the starting component 5 is an electric ignition head structure, it can be connected to a fire detection device, which is a temperature sensor and / or a smoke sensor. When a fire, overheating, or the like occurs, the fire detection device detects the high temperature environment generated in the battery compartment due to the fire and sends a signal to the microprocessor, which controls the starting component 5 to ignite the gas-generating fire extinguishing agent 2. When the starting component 5 is a thermal wire structure, the thermal wire structure can be directly ignited when a fire occurs, and then the thermal wire directly ignites the gas-generating fire extinguishing agent 2, without the need for additional fire detection devices and other external equipment, which is simpler and less costly.

[0039] Preferably, the gas-generating fire extinguishing agent 2 is located in the area where the rear cover 15 is located, and a silicone layer 16 is provided between the outer surface of the gas-generating fire extinguishing agent 2 and the inner surface of the rear cover 15. The silicone layer 16 can effectively isolate the heat generated by the combustion of the gas-generating fire extinguishing agent 2, preventing the surface temperature of the rear cover 15 and the outer cylinder 1 from being too high.

[0040] Preferably, the outer nozzle 9, the inner nozzle 4 and the corresponding inner tube 10 are multiple in number, and the outer pressure relief hole 14 and the corresponding inner pressure relief hole 13 are multiple in number. In this way, multiple flexible bags 12 can be arranged to improve the fire extinguishing capability.

[0041] In addition, the present invention also discloses a fire extinguishing method using the pulse-type fire extinguishing device using a liquid fire extinguishing agent, which comprises the following steps:

[0042] S1: When the fire extinguishing device is not activated, the inner nozzle 4 and the outer nozzle 9 are in a staggered state, and the inner pressure relief hole 13 and the outer pressure relief hole 14 are in an overlapping state;

[0043] S2: When a fire occurs, the starting component 5 ignites the gas-generating fire extinguishing agent 2, and the gas-generating fire extinguishing agent 2 generates gas;

[0044] S3: Since the inner pressure relief hole 13 and the outer pressure relief hole 14 are in an overlapping state, the airflow can push the first piston 7 to move along the rotating rod 6 to the position of the front cover 3; while the inner nozzle 4 and the outer nozzle 9 are staggered, and the top of the inner cylinder 10 is closed, the airflow can only push the second piston 11 upward for a certain distance, after which the second piston 11 stops moving;

[0045] S4: During the period when the first piston 7 moves toward the position of the front cover 3, the pressure in the space between the first piston 7 and the gas-generating fire extinguishing agent 2 in the outer tube 1 and the air area in the inner tube 10 gradually increases, forming a pressure-holding process;

[0046] S5: When the first piston 7 moves to the upper side of the rotating rod 6, the external thread 6.1 on the upper side of the rotating rod 6 cooperates with the internal thread of the inner ring of the first piston 7, so that the rotating rod 6 rotates a certain angle, and finally the inner nozzle 4 and the outer nozzle 9 are in an overlapping state, and the top of the inner cylinder 10 is in an open state; in this embodiment, the optimal length of the set external thread 6.1 can be obtained based on specific experiments, so as to ensure that the first piston 7 moves up through the distance of the external thread 6.1, which just allows the rotating rod 6 to rotate a certain angle, and finally the inner nozzle 4 and the outer nozzle 9 are in an overlapping state.

[0047] S6: Under the action of the internal high pressure, the second piston 11 pushes the flexible bag 12 to move rapidly toward the inner nozzle 4 and the outer nozzle 9, ultimately causing the second piston 11 and the flexible bag 12 to rapidly eject from the inner nozzle 4 and the outer nozzle 9. The flexible bag 12 carrying the liquid fire extinguishing agent directly reaches the fire extinguishing area. After rupturing, the liquid fire extinguishing agent rapidly extinguishes the fire, extinguishing the flames. In addition, in actual use, the second piston 11 may occasionally move and break through the flexible bag 12. In this case, the liquid fire extinguishing agent can still be ejected smoothly. Thanks to the thrust of the second piston 11, it also has a certain penetration ability, which does not affect the entire fire extinguishing process.

[0048] Furthermore, the method further comprises the following steps:

[0049] S7: After the second piston 11 is ejected from the inner nozzle 4 and the outer nozzle 9, the gaseous fire extinguishing substance generated by the gas-generating fire extinguishing agent 2 is also ejected from the inner cylinder 10, the inner nozzle 4 and the outer nozzle 9, thereby suppressing the fire extinguishing process in the fire extinguishing area and preventing the flame from reigniting.

[0050] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The embodiments and features in the embodiments of this application may be arbitrarily combined with each other unless they conflict. The scope of protection of the present invention shall be the technical solutions described in the claims, including equivalent alternatives to the technical features of the technical solutions described in the claims. Equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A pulse fire extinguishing device using a liquid fire extinguishing agent, comprising an outer cylinder (1) and a gas-generating fire extinguishing agent (2) disposed in the outer cylinder (1), a front cover (3) being disposed on the front side of the outer cylinder (1), an inner nozzle (4) being disposed on the surface of the front cover (3), an end surface of the gas-generating fire extinguishing agent (2) being connected to one end of a starting component (5), characterized in that: The outer cylinder (1) is provided with a first piston (7) which is slidably matched with the outer cylinder (1), the first piston (7) is slidably connected to the rotating rod (6), the top of the rotating rod (6) is fixedly connected to the center of the rotating cover (8), the upper side of the rotating rod (6) is provided with an external thread (6.1), the external thread (6.1) is matched with the internal thread of the inner ring of the first piston (7), the surface of the rotating cover (8) is provided with an external nozzle (9) which is matched with the internal nozzle (4), the internal nozzle (4) is fixedly connected to the top of the inner cylinder (10), the outer surface of the inner cylinder (10) is slidably connected to the first piston (7), the lower side of the inner cylinder (10) is provided with a second piston (11) which is slidably matched with the inner cylinder (10), the upper side of the second piston (11) is provided with a flexible bag body (12) which wraps a liquid fire extinguishing agent, the surface of the front cover (3) is provided with an internal pressure relief hole (13), and the surface of the rotating cover (8) is provided with an external pressure relief hole (14) which is matched with the internal pressure relief hole (13).

2. A pulse fire extinguishing device using a liquid fire extinguishing agent according to claim 1, characterized in that: The front side of the outer cylinder (1) is threadedly connected to the front cover (3), and the rear side is threadedly connected to the rear cover (15); the top of the rotating rod (6) is rotatably connected to the center of the front cover (3) via a bearing, and the bottom is rotatably connected to the center of the rear cover (15) via a bearing.

3. The pulse fire extinguishing device using liquid fire extinguishing agent according to claim 1, characterized in that: When the inner nozzle (4) opened on the surface of the front cover (3) and the outer nozzle (9) opened on the surface of the rotating cover (8) overlap, the inner pressure relief hole (13) opened on the surface of the front cover (3) and the outer pressure relief hole (14) opened on the surface of the rotating cover (8) are staggered, and the upper surface of the front cover (3) and the lower surface of the rotating cover (8) are in contact.

4. The pulse fire extinguishing device using liquid fire extinguishing agent according to claim 1, characterized in that: The gas-generating fire extinguishing agent (2) is an aerosol generating agent, and the liquid fire extinguishing agent wrapped in the flexible bag body (12) is a perfluorohexanone fire extinguishing agent.

5. A pulse fire extinguishing device using a liquid fire extinguishing agent according to claim 4, characterized in that: The gas-generating fire extinguishing agent (2) is a columnar structure formed by pressing aerosol generating agent powder.

6. The pulse fire extinguishing device using liquid fire extinguishing agent according to claim 1, characterized in that: The starting component (5) is an electric ignition head or a thermal wire structure.

7. The pulse fire extinguishing device using liquid fire extinguishing agent according to claim 2, characterized in that: The gas-generating fire extinguishing agent (2) is located in the area where the rear cover (15) is located, and a silica gel layer (16) is provided between the outer surface of the gas-generating fire extinguishing agent (2) and the inner surface of the rear cover (15).

8. The pulse fire extinguishing device using liquid fire extinguishing agent according to claim 1, characterized in that: The outer nozzle (9), the inner nozzle (4) and the corresponding inner cylinder (10) are all multiple in number, and the outer pressure relief hole (14) and the corresponding inner pressure relief hole (13) are also multiple in number.

9. A fire extinguishing method using a pulse type fire extinguishing device of any one of claims 1 to 8, characterized in that: It includes the following steps: S1: When the fire extinguishing device is not activated, the inner nozzle (4) and the outer nozzle (9) are in a staggered state, while the inner pressure relief hole (13) and the outer pressure relief hole (14) are in an overlapped state; S2: When a fire occurs, the starting component (5) ignites the gas-generating fire extinguishing agent (2), and the gas-generating fire extinguishing agent (2) generates gas; S3: Since the inner pressure relief hole (13) and the outer pressure relief hole (14) are in an overlapping state, the airflow can push the first piston (7) to move along the rotating rod (6) toward the position of the front cover (3); while the inner nozzle (4) and the outer nozzle (9) are in an offset state, and the top of the inner cylinder (10) is in a closed state, the airflow can only push the second piston (11) to move upward for a certain distance, after which the second piston (11) stops moving; S4: During the period of time when the first piston (7) moves toward the position of the front cover (3), the pressure in the space between the first piston (7) and the gas-generating fire extinguishing agent (2) in the outer cylinder (1) and the air region in the inner cylinder (10) gradually increases, forming a pressure holding process; S5: When the first piston (7) moves to the upper side of the rotating rod (6), the external thread (6.1) on the upper side of the rotating rod (6) cooperates with the internal thread of the inner ring of the first piston (7), so that the rotating rod (6) rotates a certain angle, and finally the inner nozzle (4) and the outer nozzle (9) are in an overlapping state, and the top of the inner cylinder (10) is in an open state; S6: Under the action of the internal high pressure, the second piston (11) pushes the flexible bag body (12) to move rapidly toward the inner nozzle (4) and the outer nozzle (9), and finally the second piston (11) and the flexible bag body (12) are rapidly ejected from the inner nozzle (4) and the outer nozzle (9), and the flexible bag body (12) carrying the liquid fire extinguishing agent directly reaches the fire extinguishing area. After the rupture occurs, the liquid fire extinguishing agent performs a rapid fire extinguishing process to extinguish the flames.

10. The fire extinguishing method using a pulse type fire extinguishing device of liquid fire extinguishing agent according to claim 9, characterized in that: The following steps are also included: S7: When the second piston (11) is ejected from the inner nozzle (4) and the outer nozzle (9), the gaseous fire extinguishing substance generated by the gas-generating fire extinguishing agent (2) is also ejected from the inner cylinder (10), the inner nozzle (4) and the outer nozzle (9), thereby suppressing the fire extinguishing process in the fire extinguishing area and preventing the flame from reigniting.

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