SU1621955A1 - Automatic device of foam fire-extinguishing - Google Patents

Abstract

The invention relates to automatic fire protection, can be used in any automatic installation for extinguishing fires with foam and improves the efficiency of fire extinguishing installations, reducing operating costs for fire extinguishing and eliminating uncontrolled contamination of land and water. A device for foam extinguishing includes a valve unit filled with water, having pneumatic and hydraulic spaces. The pneumatic space communicates with the pneumatic part of the feeder tank, and the hydraulic space - with the section of the pipeline system located between the check valve and the starting-stop device. 1 il.

Description

This invention relates to business activities where automatic fire protection is required.

The aim of the invention is to increase the efficiency of fire extinguishing installations, reduce the operating costs of fire extinguishing by preventing losses of the foaming agent solution, eliminating uncontrolled contamination of land and water.

The drawing shows a diagram of the automatic device foam fire extinguishing.

The device contains an automatic power supply unit 1, which includes an automatic feeder 2, a check valve 3, shut-off valves 4, main pipelines 5, a shut-off start unit 6, and a shutter unit 7.

The valve unit 7 is a pneumatic-hydraulic tank 8. Its pneumatic part 9 communicates with the pneumatic part of the feeder tank, and the hydraulic part 10 with the section of the pipeline system 5 located between the check valve 3 and the locking-starting device 6. For filling the hydraulic part of the unit 7 water is used that is not environmentally hazardous in quality. The constant water level in the tank 8 of the node 7 is maintained due to its automatic watering provided by any of the known similar devices.

The device works as follows.

In the tank 8 of the shutter assembly, the pneumatic space 9 is under the same pressure as in the power supply unit, but the water level in it is higher than the level of the solution in the power supply unit by the amount H, sufficient to hold the check valve in the locked position and prevent current frother solution until cut occurs (L

WITH

about

1CE

o ate

Some increase in water flow from the system caused by a fire.

The value of H must satisfy the condition

H K -Z

Јп

where - coefficient taking into account the tolerances for the installation of plumbing systems;

Z is the difference of the vertical marks of the level of the foaming agent solution in the automatic feeder and the bottom of the check valve, m;

RP, RV density, respectively, of the solution of the blowing agent and water, kg / m.

The invention makes it possible to refuse to apply other, uneconomical measures, for example, to install additional booster pumps, which, although they allow keeping the plants in a healthy state, do not exclude losses of solution and environmental pollution.

Rast & op

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five

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Claims (1)

Claims of the invention An automatic foam fire extinguishing device comprising an automatic feeder, a non-return valve installed on the solution supply line, shut-off valves, main pipelines, a shut-off start-up unit installed on the solution supply line, characterized in that , reducing the cost of compensating for the loss of foaming agent and preventing environmental pollution, it has a valve assembly with a pneumohydraulic tank, the pneumatic space of which connected to the pneumatic space of the automatic power supply, and hydraulic - to the section of the solution supply lines between the check valve and the shut-off and starting unit, and the tank of the shutter assembly is installed relative to the automatic feeder with an elevation that provides water pressure sufficient to prevent foaming agent leaks through the check valve.