RU1794460C - Generator for powder fire-extinguisher - Google Patents

Abstract

Usage: in the field of fire fighting. SUMMARY OF THE INVENTION: a gas generator body has a developed external and internal developed surface and a normally closed valve is pneumatically connected to the mixing chamber of the ejector. 1 ill. 2 zpf

Description

The invention relates to fire fighting equipment, and more particularly to a powder fire extinguisher.

A gas generator for a powder fire extinguisher is closest to what is claimed and adopted as a prototype, comprising a cylindrical body with a sequentially arranged igniter, a solid fuel charge, a nozzle for the exit of generated gases and a gas cooler, which is made in the form of a spiral tape and. h absorbent material laid with a gap between the turns.

The disadvantages of the prototype are that heat is removed mainly by absorbing it with a spiral tape, a throttle effect, and lengthening the path of the passage of hot generated gases. The time of operation of the solid fuel charge is from 3 to 20 s, depending on the volume of the extinguisher body and the operating pressure, and the time of discharge of the extinguishing powder is an order of magnitude higher. Therefore, the heat removal is insignificant, since the heat-absorbing material (spiral tape) transfers heat to the internal cavity of the body to the fire of the extinguisher, where the gas cooler is located. As a result, sintering of the extinguishing powder occurs and, as a result, leads to a decrease in the overall performance of the device. In addition, the composition of the generated gases may contain up to 2% by volume of oxide, carbon, which is unsafe in case of accident, when a person working with a fire extinguisher can inhale the outgoing powder with the generated gas containing a highly toxic component. In this case, one incomplete air can be fatal.

The aim of the invention is to increase the efficiency of the gas generator.

This goal is achieved in that the cylindrical body is made of a material with high thermal conductivity, has an unfolded inner and outer surface, and is equipped with a normally closed valve pneumatically connected to the mixing chamber of the ejector.

The surface of the cylindrical housing, for example, is turned in the form of rectangular annular grooves on the outer and inner surfaces of the housing, which, with a normally closed valve, are located outside the housing of the powder extinguisher.

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Such a design allows, due to the presence of a normally closed valve pneumatically connected to the mixing chamber of the ejector, to increase the amount of gas involved in the displacement of the extinguishing powder and to lower the temperature, as well as to reduce the volume fraction of carbon monoxide.

Due to the increased internal and external surfaces of the cylindrical body of the gas generator and its manufacture from a material with high thermal conductivity, as well as the location of the cylindrical body with a normally closed valve and solid fuel charge with an igniter outside the internal cavity of the body of the fire extinguisher, the heat exchange between the internal cavity of the cylindrical body and the external Wednesday.

. The drawing shows a generator in section and conditionally shows the casing of a powder fire extinguisher.

The generator comprises a cylindrical housing 1 with inner 2 and outer 3 ring slots and a cover 4., a normally closed valve 5, which serves to suck in atmospheric air, and a trigger mechanism b with a trigger lever 7, which perform impact on the igniter, solid propellant charge d 8, generating a displacing gas, an ejector 9, forming a gas-air flow

and having a nozzle 10, a mixing chamber 11, in which the generated gas and the intake air are mixed, and a diffuser 12, a gas distribution pipe

13, Conventionally shown is a casing 14 of a powder fire extinguisher.

The generator operates as follows. When you press the start lever 7 of the trigger 6, the igniter ignites

solid fuel charge 8. The resulting high-temperature combustion gases exit the nozzle 10 of the ejector 9, creating a vacuum in the mixing chamber. As a result, a normally closed valve opens and air is sucked into the ejector from the atmosphere, where it is mixed with the generated gas, while cooling it, and then through the diffuser 12 and the gas distribution pipe 13 enters

the internal cavity of the body 14 of the fire extinguisher. When a backpressure of a certain size is created in a gas-air system, a normally closed valve takes its initial position, i.e. - closes.

The implementation of the claimed technical solution will significantly increase the efficiency of the generator due to the significant cooling of the generated

Gas and increasing the volume of gas intended to discharge the extinguishing powder. In addition, it will significantly reduce the carbon monoxide content in the generated gas.

Claims (3)

SUMMARY OF THE INVENTION 1. Generator for a powder fire extinguisher, comprising a cylindrical body with a cap and a trigger with a sequentially arranged igniter, solid fuel charge, ejector and gas distributor, characterized in that, in order to increase the efficiency of the gas generator, the cylindrical body is made of material with high thermal conductivity, has a developed inner and outer surfaces and is equipped with a normally closed valve pneumatically connected to the mixing chamber the ector. 2. A generator according to claim 1, characterized in that the surface of the cylindrical body is developed, for example, made in the form of rectangular annular grooves on the external and internal surface of the body. 3. The generator according to claim 1, with the exception that its casing with a valve is located outside the casing of the powder fire extinguisher.