CN108771805B

CN108771805B - Miniature aerosol fire extinguishing device for circuit board

Info

Publication number: CN108771805B
Application number: CN201810735465.XA
Authority: CN
Inventors: 郑永华; 陈翠芳
Original assignee: Hunan Anmin Technology Co ltd
Current assignee: Hunan Anmin Technology Co ltd
Priority date: 2018-07-27
Filing date: 2018-07-27
Publication date: 2023-06-27
Anticipated expiration: 2038-07-27
Also published as: CN108771805A

Abstract

The invention discloses a miniature aerosol fire extinguishing device for a circuit board, which belongs to the technical field of fire extinguishing and comprises a shell, a lower cover, aerosol powder columns, an electric match and a starting device, and is characterized by further comprising a cooling component, pins, wherein the shell and the lower cover form a sealed cavity; the aerosol grain is positioned at the bottom of the upper cavity, and gaps are reserved between the periphery of the grain and the shell; a counter bore is arranged at the top of the aerosol grain, and electric matches are arranged in the counter bore; the cooling components are stacked cooling balls with gaps between the cooling balls. The device can automatically cut off the power supply of the circuit board and give out fire alarm at the initial stage of fire, can automatically extinguish the fire source, can be triggered in various modes such as temperature sense, smoke sense, open fire and the like, and can reliably start and extinguish the fire.

Description

Miniature aerosol fire extinguishing device for circuit board

Technical Field

The invention relates to the field of fire-fighting equipment, in particular to a miniature aerosol fire-extinguishing device for a circuit board.

Background

The fire of the general electronic and electric appliance is caused by ageing and heating of internal components or fire caused by circuit short circuit, and when people find that the fire of a certain module damages other parts, such as a main board and a display card are burnt out due to the fire of a computer power supply, and the fire of an electric vehicle charger cannot be extinguished in time, so that the electric vehicle is burnt out. The fire points of the circuits are often in various narrow spaces, such as transformers, power distribution cabinets, engine cabins of vehicles, luggage cabins and the like, and in places needing power distribution and conversion of electricity and places needing gasoline, diesel oil and aviation kerosene in airplanes, vehicles and ships, fire hazards such as aging of wires, leakage of oil sources, severe environments and the like are generally difficult to discover and detect in early stages, and a spark can cause a big fire to cause serious casualties and equipment damage. Under the condition, the local area can quickly extinguish fire, and the effect of half effort can be achieved. In these occasions, the fire extinguishing difficulty is that the gap of the inner space is narrow, the fire extinguishing difficulty is that the dry powder fire extinguisher is covered by the shell, the fire extinguishing difficulty is that the short circuit is caused by the water fire extinguisher, and the fire extinguishing difficulty is that the water fire extinguisher is not suitable for electric fire. The existing miniaturized rapid fire extinguishing devices are few, and the power supply of a circuit board or an electronic device cannot be automatically cut off; small fire extinguishing range, etc.

Disclosure of Invention

The invention aims to provide the miniature aerosol fire extinguishing device for the circuit board, which can automatically cut off the power supply of the circuit board and give out fire alarm at the initial stage of fire, can automatically extinguish the fire source, and can reliably start and extinguish the fire by various modes such as temperature sense, smoke sense, open fire and the like.

The invention provides a miniature aerosol fire extinguishing device for a circuit board, which comprises a shell, a lower cover and pins, wherein the shell and the lower cover form a sealed cavity, a heat insulation plate divides the cavity into an upper cavity and a lower cavity, an aerosol grain and a cooling device are positioned in the upper cavity, a plurality of discharge holes are arranged at the upper part of the shell, and the discharge holes are blocked by a sealing film or a sealing plug;

the aerosol grain is positioned at the bottom of the upper cavity, gaps are reserved between the periphery of the grain and the shell, a counter bore is formed in the top of the aerosol grain, and an electric match is arranged in the counter bore;

the cooling component is positioned above the aerosol grain and comprises stacked cooling balls which are mutually spaced;

the starting device comprises a battery and an induction element which are connected through a circuit, wherein the induction element is one or more of a temperature switch, a smoke switch and a thermal ignition wire, and the battery is positioned in the lower cavity;

the pins are soldered or plugged onto the circuit board.

Preferably, the intelligent power supply also comprises a power supply controller, wherein the power supply controller circuit comprises a circuit board power supply, a power switch and a normally-closed relay, a coil branch and an output branch of the normally-closed relay are connected on the positive electrode wire of the circuit board power supply in parallel, and the other end of the coil branch of the normally-closed relay is connected with a temperature switch and a smoke sensing switch which are connected in parallel and then connected with the negative electrode wire of the power supply; the output branch of the normally closed relay is connected with a normally closed switch and a circuit board working device in series and then is connected with the negative electrode line of the power supply.

The positive electrode wire after the power switch is connected with a fuse box in series.

The temperature switch and the smoke sensing switch are connected in parallel to two wires, the two wires and the thermal initiation wire enter the lower cavity through a first wire passing hole in the lower cover, one wire is connected with one end of the battery, the other end outgoing wire of the battery passes through a second wire passing hole in the heat insulation plate to be connected with the electric match, the other wire passes through the second wire passing hole to be connected with the electric match, and the two wires are connected with the electric match to form a passage; the thermal initiation wire passes through the second wire passing hole and is connected with the electric match and the aerosol grain.

Gaps of the first wire through holes and the second wire through holes are sealed by insulating sealant, and the heat insulation plate is made of ceramic or asbestos materials; the cooling balls are particles made of sodium bicarbonate, quartz sand or ceramic materials.

The cooling device also comprises a steel wire mesh and a spring, one end of the spring is tightly pressed on the top plate of the shell, the other end of the spring is tightly pressed on the cooling ball through the steel wire mesh, and the cooling ball is tightly pressed on the aerosol grain.

The sealing film is a film which is closely attached to the outer surface of the shell or a film which is closely attached to the inner surface of the shell.

The battery is a chargeable battery, the pins are conductors and are provided with two pins, the outer ends of the two pins are respectively connected with an anode wire and a cathode wire of a power supply of the circuit board, the inner ends of the two pins are respectively connected with the anode and the cathode of the battery, and the circuit board charges the battery through the two pins after being electrified.

The discharge hole is one circle or two circles of straight holes or taper holes; or, the discharge hole is two circles of holes which are staggered, one circle of holes is a horn hole, and the other circle of holes is an inverted horn hole with opposite opening degrees.

The beneficial effects of the invention are as follows: the conductive pins are fixed and charged into a whole, and through overhead installation of the pins, the space of a circuit board is not occupied, and the charging function enables the battery to realize automatic charging and supplement when the electric quantity is insufficient, so that the service life of the battery is prolonged, and the tedious work of disassembling the circuit board shell and the miniature fire extinguisher is avoided; when the temperature switch detects a starting value of the temperature of ignition or the smoke sensor switch detects a starting value of smoke concentration of ignition, the temperature switch or the smoke sensor switch is conducted, so that two leads are electrified, a battery is connected, electric matches are electrified and ignited, aerosol powder columns are ignited, the aerosol powder columns are gasified instantly after being ignited, the air pressure in an upper cavity is suddenly increased, sealing films for blocking a discharge hole are broken through filling, and the periphery of the discharge hole is sprayed to realize fire extinction, and meanwhile, when the temperature switch or the smoke sensor switch is conducted, a coil branch of a normally closed relay of a power supply controller is electrified, so that the normally closed switch on an output branch of the normally closed relay is disconnected, power off of working devices such as a circuit board is realized, and secondary disasters such as electric fires caused by fires are avoided; the fire extinguishing device is also provided with a thermal ignition wire, when the fire is exposed or the temperature reaches the ignition point of the thermal ignition wire, the thermal ignition wire burns to ignite the electric matches and aerosol powder columns, so that the fire extinguishing can be realized; the cooling ball is arranged in the inner cavity of the upper part of the pipe body, so that when the aerosol grain is ignited, gasified and rushed upwards, the hot aerosol can be cooled, and the cooling ball occupies a large amount of space, so that the inner cavity of the upper part of the pipe body only has limited overair space, and the high pressure can be kept; when the fire extinguisher is used in daily life, the spring at the nozzle pushes the cooling balls to the aerosol grain through the steel wire mesh, so that the cooling balls can not loosen and roll, the electric match is always contacted with the aerosol grain under the pressure action of the cooling balls, the aerosol grain is ignited and gasified to generate high-pressure gas, the high-pressure gas upwards rushes, when the high-pressure gas passes through a plurality of cooling balls, an unbalanced channel generates huge pressure shaking in an irregular narrow gap between the cooling balls, the cooling balls and the steel wire mesh are also driven to upwards rush, the spring at the nozzle is pressed at the moment to play a role of balancing and buffering, so that the air flow can relatively uniformly fill the sealing film of each discharge hole, the improvement of the range is facilitated, and the spraying flow of the hot aerosol in the spraying process is uniform and stable; when one circle of the discharge hole is a horn hole and the other circle of the discharge hole is an inverted horn hole with opposite opening degrees, the range of the discharge hole can be covered more widely, the range of the inverted horn hole with a small outlet is far, the horn Kong Shecheng with a large outlet is near, the two are complementary, and the full coverage of the surrounding area is realized.

Drawings

FIG. 1 is a schematic diagram of a first embodiment of the present invention;

FIG. 2 is a circuit diagram of a power controller according to a first embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a second embodiment of the present invention;

reference numerals: the device comprises a shell 1, a discharge hole 2, a spring 3, a steel wire mesh 4, a cooling ball 5, an electric match 6, an aerosol grain 7, a first wire passing hole 8, a heat insulation plate 9, a sealing film 10, a battery 11, a lower cover 12, pins 13, a heat inducing wire 14, a conducting wire 15, a temperature switch 16, a power supply controller 17, an upper cavity 18, a lower cavity 19, a second wire passing hole 20, a smoke sensing switch 21, a circuit board power supply 30, a power supply switch 31, a normally closed relay 32, a positive wire 33, a coil branch 34, an output branch 35, a circuit board working device 36, a negative wire 37 and a fuse box 38.

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

Example 1

Referring to fig. 1 and 2, the embodiment comprises a shell 1, a lower cover 12 and pins 13, wherein the shell 1 and the lower cover 12 form a sealed cavity, a heat insulation plate 9 divides the cavity into an upper cavity 18 and a lower cavity 19, an aerosol cartridge 7 and a cooling device are positioned in the upper cavity, a plurality of discharge holes 2 are arranged at the upper part of the shell, and the discharge holes are blocked by a sealing film 10; the aerosol grain 7 is positioned at the bottom of the upper cavity 18, gaps are reserved between the periphery of the grain and the shell, a counter bore is formed in the top of the aerosol grain 7, and an electric match 6 is arranged in the counter bore; the cooling component is located above the aerosol grain and comprises stacked cooling balls 5 with gaps, a steel wire mesh 4 and a spring 3, one end of the spring 3 is pressed against a top plate of the shell, the other end of the spring is pressed against the cooling balls 5 through the steel wire mesh 4, and the cooling balls 5 are pressed against the aerosol grain 7. The starting device comprises a battery 11 and an induction element which are connected through a circuit, wherein the induction element comprises a temperature switch 16, a smoke switch 21 and a thermal ignition wire 14, and the battery is positioned in a lower cavity 19; the pins 13 are soldered or plugged onto the circuit board.

The power supply controller 17 is also included, the power supply controller circuit comprises a circuit board power supply 30, a power switch 31 and a normally-closed relay 32, a coil branch 34 and an output branch 35 of the normally-closed relay are connected on a positive line 33 of the circuit board power supply 30 in parallel, and the other end of the coil branch 34 of the normally-closed relay is connected with a temperature switch 16 and a smoke sensor switch 21 which are connected in parallel and then connected with a negative line 34 of the power supply; the output branch 35 of the normally closed relay is connected in series with a normally closed switch and a circuit board working device 36 and then connected to the negative electrode line 37 of the power supply. A fuse box 38 is connected in series to the positive line 33 after the power switch. The temperature switch 16 and the smoke sensing switch 21 are connected in parallel to the two wires 15, the two wires 15 and the thermal initiation wire 14 enter the lower cavity 19 through the first wire passing hole 8 on the lower cover, one wire is connected with one end of the battery 11, the other end outgoing wire of the battery passes through the second wire passing hole on the heat insulation plate 9 to be connected with the electric match 6, the other wire passes through the second wire passing hole 20 to be connected with the electric match 6, and the two wires connect the electric match 6 into a passage; the thermal ignition wire 14 is connected to the electric match 6 and the aerosol canister 7 through the second wire through hole 20. The gaps between the first wire through holes 8 and the second wire through holes 20 are sealed by insulating sealant, and the heat insulation plate is made of ceramic or asbestos materials; the cooling balls are particles made of sodium bicarbonate, quartz sand or ceramic materials. The sealing membrane 10 is a thin film which is closely attached to the outer surface of the housing. The battery 11 is a chargeable battery, the pins 13 are conductors and are provided with two pins, the outer ends of the two pins 13 are respectively connected with a positive electrode wire and a negative electrode wire of a circuit board power supply, the inner ends of the two pins are respectively connected with the positive electrode and the negative electrode of the battery 11, and the circuit board is electrified to charge the battery through the two pins. The discharge hole 2 is provided with two circles of staggered holes, one circle of holes is a horn hole, and the other circle of holes is an inverted horn hole with opposite opening degrees.

The aerosol grain is S-shaped solid aerosol fire extinguishing agent, and the solid aerosol fire extinguishing agent is electrically started to generate oxidation-reduction reaction to form a large amount of agglomerated fire extinguishing aerosol, and the ingredients of the solid aerosol fire extinguishing agent mainly comprise N2, a small amount of CO2, metal salt solid particles and the like, and the fire extinguishing mechanism is as follows: firstly, gas phase chemical inhibition, namely under the action of heat, gasified metal ions decomposed in fire extinguishing aerosol or cations losing electrons can carry out affinity reaction with active groups in combustion, so that the active groups are repeatedly consumed in a large amount, and combustion free radicals are reduced. Secondly, solid phase chemical inhibition, namely, the particle size of particles in the fire extinguishing aerosol is very small (10 < -9 > -10 < -6 >) and has very large surface area and surface energy, active groups in combustion can be adsorbed, chemical actions are generated, active groups are consumed greatly, and combustion free radicals are reduced. And thirdly, the oxygen concentration is reduced, namely N2 and CO2 in the fire extinguishing aerosol can reduce the oxygen concentration in combustion, but the speed is slow, and the fire extinguishing effect is far smaller than that of heat absorption, temperature reduction and chemical inhibition. No foam is generated, and aerosol fire extinguishing suspended particles are generated.

Example two

Referring to fig. 3, this embodiment is basically the same as the first embodiment except that the cooling member has only the cooling balls 5, no springs or steel wire mesh are provided, and the bleed hole 2 is a straight hole.

The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather to apply the equivalent structure changes made by the specification and the drawings of the present invention, or directly or indirectly, in the relevant technical field, and are included in the scope of the invention.

Claims

1. The miniature aerosol fire extinguishing device for the circuit board is characterized by comprising a shell, a lower cover and pins, wherein the shell and the lower cover form a sealed cavity, a heat insulation plate divides the cavity into an upper cavity and a lower cavity, an aerosol grain and a cooling device are positioned in the upper cavity, a plurality of discharge holes are formed in the upper part of the shell, and the discharge holes are blocked by a sealing film or a sealing plug;

the cooling device is positioned above the aerosol grain and comprises stacked cooling balls which are mutually spaced;

stitch welding or inserting on the circuit board;

the power supply controller circuit comprises a circuit board power supply, a power switch and a normally closed relay, wherein a coil branch and an output branch of the normally closed relay are connected on the positive electrode wire of the circuit board power supply in parallel, and the other end of the coil branch of the normally closed relay is connected with a temperature switch and a smoke sensor switch which are connected in parallel and then connected with the negative electrode wire of the power supply; the output branch of the normally closed relay is connected with a normally closed switch and a circuit board working device in series and then is connected with the negative electrode line of the power supply.

2. A miniature aerosol fire extinguishing apparatus for a circuit board according to claim 1, wherein a fuse box is connected in series to the positive line after the power switch.

3. The miniature aerosol fire extinguishing apparatus for a circuit board according to claim 1, wherein the temperature switch and the smoke sensor switch are connected in parallel to two wires, the two wires and the heat-induced wire enter the lower cavity through a first wire passing hole in the lower cover, one wire is connected with one end of the battery, the other end of the battery is connected with the electric match through a second wire passing hole in the heat insulation board, the other wire is connected with the electric match through the second wire passing hole, and the two wires connect the electric match into a passage; the thermal initiation wire passes through the second wire passing hole and is connected with the electric match and the aerosol grain.

4. A miniature aerosol fire extinguishing apparatus for a circuit board according to claim 3, wherein the gaps of the first wire passing holes and the second wire passing holes are sealed by insulating sealant, and the heat insulating plate is made of ceramic or asbestos material; the cooling balls are particles made of sodium bicarbonate, quartz sand or ceramic materials.

5. A miniature aerosol fire suppression apparatus for a circuit board according to claim 1, wherein the cooling means further comprises a wire mesh, a spring having one end compressed against the top plate of the housing and the other end compressed against the cooling ball by the wire mesh and causing the cooling ball to compress against the aerosol cartridge.

6. A miniature aerosol fire suppression apparatus for a circuit board according to claim 1, wherein the sealing membrane is a film that is adhered to the outer surface of the housing or a film that is adhered to the inner surface of the housing.

7. The miniature aerosol fire extinguishing device for a circuit board according to claim 1, wherein the battery is a rechargeable battery, the pins are conductors and are provided with two pins, the outer ends of the two pins are respectively connected with a positive electrode wire and a negative electrode wire of a power supply of the circuit board, the inner ends of the two pins are respectively connected with the positive electrode and the negative electrode of the battery, and the circuit board charges the battery through the two pins after being electrified.

8. A miniature aerosol fire suppression apparatus for a circuit board according to claim 1, wherein the bleed aperture is one or two turns of straight or tapered aperture; or, the discharge hole is two circles of holes which are staggered, one circle of holes is a horn hole, and the other circle of holes is an inverted horn hole with opposite opening degrees.