RU1806798C - Device for fire extinguishing with powder - Google Patents

Abstract

Usage: in mechanical engineering, in particular in fire fighting equipment. SUMMARY OF THE INVENTION: the device comprises a powder hopper 1, equipped with a filler neck 2, a safety valve 3, an inclined aerofoil 4 and a nozzle 5 for dispensing the powder, and a pneumatic system for aerating the powder and trapping the air-powder mixture. The powder supply pipe 5 is connected to a feeder 6 containing a variable pitch screw 7 and connected to an airlift 8 connected via pipelines to the gun carriage and hand barrels. 2 ill.

Description

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FIG. 1

The invention relates to fire fighting equipment, and more particularly, to devices for extinguishing fires by ejecting extinguishing powder onto a fire, intended primarily for use in a fire-fighting vehicle.

The aim of the invention is to reduce the weight of the structure, which is achieved by separation of the device into parts that perform separate aeration and powder displacement.

Fig. 1 is a schematic diagram of a device; figure 2 is a section aa in figure 1.

A device for extinguishing fires with a powder comprises a hopper 1 including a neck 2 for loading; safety valve 3 and aero-4, connecting pipe 5, feeder 6 with screw 7 variable pitch. The feeder 6 is connected to an airlift 8, including an airlift 9, a pressure pipe 10, made with the possibility of rotation in it around its axis of the pipe 11, connected to a ball valve 12, connected to a pipe 13, to which the gun barrel 14 is connected with the possibility of rotation around horizontal axes at the point of attachment, and control knobs 15. A pipe 16 with a valve 17 is connected to the pressure pipe 10 to connect a flexible sleeve to a hand barrel (not shown). The pneumatic system included in the device consists of a source of compressed air 18 having a valve 19 connected to a pressure reducer of the first stage 20 and connected to it by a high pressure pipe 21 with a pipe 22 connected to an airlift 8 and then to a second stage reducer 23 connected through a pipeline 24 with a hopper 1 under the aerodynamic 4. The drive 25 connects the screw 7 to a shaft 26 connected to a standard power take-off shaft of the vehicle.

The device operates as follows.

In the standby state, the hopper 1 is filled with powder while maintaining some slight free volume above its surface, the actuator 25 is disconnected from the vehicle’s standard power take-off shaft by means of its standard clutch, and the valve 19 on the compressed air source 18 is closed. On start up

the power take-off shaft coupling and valve 19 opens. In this case, the screw 7 is driven into rotation by the drive 5 and at the same time air enters the gearbox

the first stage, providing high pressure sufficient to overcome the resistance of the airlift 8 with an airlift 9, the pipeline 10, the ball valve 12 and the gun barrel 14 while maintaining the energy of the air-powder jet; necessary to throw it at a given distance. High pressure air from gearbox 20 through line 21

enters the airlift 8 under its airlift 9 and simultaneously into the gearbox of the second stage 23, where the pressure is further reduced to a value sufficient to overcome the resistance of the powder layer,

located in the hopper 1. Low-pressure air from the pressure reducer 23 through a pipe 24 enters the hopper 1 under the aerodynamic 4, penetrates through the thickness of the powder, loosens it and turns it into a mixture with powder

the pseudo-fluid that flows down the inclined aerodynamic bottom 4 and the nozzle 5 into the feeder 6. In the feeder 6, the screw 7 having a variable pitch feeds simultaneously a compacted powder into the aerolith 8, and by penetrating the powder, air is prevented from penetrating towards the powder supplied by the feeder. The powder entering the airlift 8, under the influence of high-pressure air entering through the airlift 9, is additionally pseudo-fluidized and, gaining energy from the excess air pressure, is against the energy needed for aeration and pseudo-liquefaction, through a pipe 10 from an airlift 8 and through a pipe 10 through a ball a crane 12, a pipe 13 through a fire monitor 14 is fed to the fire.

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Claims (1)

The claims A powder fire extinguishing apparatus comprising a powder hopper and displacing the air-powder mixture, characterized in that, in order to reduce the weight of the structure, it has a feeder, and a nozzle for discharging the powder is connected to a feeder containing a screw with in variable pitch and connected through pipelines with fire monitors and manual trunks. FIG. 2