Low flow positive pressure automatic foam proportioner

Abstract

The invention relates to a low flow positive pressure automatic foam proportioner, which comprises a flow meter for measuring the water flow of an output pipeline of a fire pump, a liquid level switch for setting the foam proportion, a foam proportion controller for calculating the rotate speed of a foam metering pump according to the set foam proportion and measured water flow, a foam metering pump controller for controlling an adjustable-speed motor according to the calculation result of the foam proportion controller, a display operating instrument served as an input and output device of the foam proportion controller, a foam metering pump for adding foam into the output pipeline of the fire pump and the adjustable-speed motor for driving the foam metering pump. The invention solves the technical problem that primary adding method cannot meet large changing range of water flow of foam fire-fighting equipment, and provides the low flow positive pressure automatic foam proportioner that can add foam solution according to set proportion within a full flow range.

Description

technical field [0001] The invention relates to a proportional adding system, in particular to a small flow positive pressure automatic foam proportional mixing device. Background technique [0002] Traditional foam fire pumps can only be used for foam liquid with a fixed ratio and a set flow rate. With the change of fire extinguishing requirements, the types of foam liquid continue to increase, and the proportion of foam liquid added to water is constantly changing. The original adding method has been It cannot meet the large change range of the water flow of the foam fire fighting equipment, so a small flow positive pressure automatic foam proportional mixing device with convenient ratio setting, wide range and large flow change is needed. Contents of the invention [0003] The purpose of the present invention is to provide a small flow positive pressure automatic foam proportional mixing device, which can add foam stock solution according to the set ratio within the ful...

AI Technical Summary

Problems solved by technology

[0002] Traditional foam fire pumps can only be used for foam liquid with a fixed ratio and set flow rate. With the change of fire extinguishing requirements, the types of foam liquid continue to increase, and the proportion of foam liquid added to water is constantly changing. The original method of adding foam liquid has been changed. It cannot meet the large change range of the water flow of the foam fire fighting equipment. Therefore, a small flow positive pressure automatic foam proportional mixing device with convenient proportion setting, wide range and large flow change is required.

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