Large-flow compressed air foam system

Abstract

The invention discloses a large-flow compressed air foam system. The large-flow compressed air foam system comprises a water inlet (2), a water pump (1), a Venturi tube (4), a metering valve (8), a foam liquid flow meter (7) and a foam liquid tank (5), wherein the water pump (1) and the Venturi tube (4) are connected with the water inlet (2), the metering valve (8) is connected with the Venturi tube (4), the foam liquid flow meter (7) is connected with the metering valve (8), and the foam liquid tank (5) is connected with the foam liquid flow meter (7); and the water pump (1) is sequentially connected with a main flow meter (9), a check valve (10) and a mixer (12) through pipelines, and the mixer (12) is separately connected with an air compressor (11), a fire-fighting monitor (16), a first fire-fighting water gun (17) and a second fire-fighting water gun (18). The large-flow compressed air foam system is reasonable in structural design, convenient to use, capable of meeting the requirement of a large-flow B-type compressed air foam system, high in fire-fighting operation capacity, good in fire-extinguishing performance, capable of preventing plugging of a filter screen of a foam pump, long in service life and high in practicability.

Description

technical field [0001] The invention relates to fire fighting equipment, in particular to a large-flow compressed air foam system. Background technique [0002] Compressed air bubble system (CAFS) is used in the field of fire protection, which can fully refine and foam the foam mixture. The foam contains a large amount of high-pressure air, which enhances the penetration ability and adhesion ability of the fire extinguishing agent, and its fire extinguishing effect is higher than that of pure water. 10 times or more. Because the foam mixture contains compressed air, the water consumption is small, and the fire fighting operation time is long; the weight of the hose can be reduced by more than 50% during operation, and the fire fighting mobility is high. The basic principle of the existing CAFS technology is: use a water pump and a foam pump to mix water and foam liquid in proportion to form a foam mixture, and then inject high-pressure compressed air into the mixing chamber...

AI Technical Summary

Problems solved by technology

[0003] The existing CAFS technology uses a foam pump to transport the foam liquid. Since the B-type foam liquid, especially the fluoroprotein foam liquid, has high viscosity and many impurities, it is easy to cause the filter screen of the foam pump to be blocked; if the fire-fighting operation is not rinsed in time, The dryness of the residual foam liquid will cause the interference of the matching surface in the foam pump, resulting in stalling

The above situation will cause the fire truck to be unable to work

In addition, limited by the space, power and manufacturing cost of the fire truck, only a foam pump with a small flow rate can be used on the fire truck

The mixture of Class B foam liquid and water is relatively large, and the flow rate of foam liquid is relatively large when spraying Class B foam. Therefore, the foam pump can only meet the needs of small and medium flow Class B CAFS systems, and cannot meet the fire-fighting needs of large-scale fires.

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