Regulation type proportional mixer

Abstract

The invention discloses an adjusting proportioner with convenient operation, small labor intensity and excellent using effect. The adjusting proportioner comprises a runner pipe, wherein the outside of the runner pipe is provided with an outer thimble; a cavum is arranged between the runner pipe and the outer thimble; a foam concentrate pipe is arranged on the outer thimble; the foam concentrate pipe is communicated with the cavum; one end of the runner pipe and the outer thimble is provided with a closure plate closing a ring cavity formed by the end parts of the runner pipe and the outer thimble; the other end of the runner pipe and the outer thimble is provided with a pore plate provided with a plurality of holes communicated with the ring cavity formed by the runner pipe and the outer thimble; an adjusting ring is movably connected with one side of the pore plate; and the adjusting ring is provided with holes the amount of which is corresponding to the holes in the pore plate. The adjusting proportioner with convenient operation, small labor intensity and excellent using effect is applicable to proportioning for water and foam in a fire control foam extinguishing system.

Description

technical field [0001] The invention relates to a proportional mixer, in particular to a proportional mixer used in a fire-fighting foam fire extinguishing system capable of steplessly adjusting the mixing ratio within a set interval. Background technique [0002] In the fire-fighting foam fire extinguishing system, it is necessary to automatically mix the two liquids of water and foam liquid in a certain proportion. The working pressure range required by the system is wide. The relative pressure before entering the proportional mixer) is determined by the flow cross section of the two media entering the proportional mixer. Usually the proportional mixer used is a fixed structure, and the flow cross section of the medium flowing through the orifice plate is a fixed value. If you want to change the mixing ratio, you must replace the orifice plate with different flow cross section. There is a necked section at the outlet end of the proportional mixer. , which is a typical cha...

AI Technical Summary

Problems solved by technology

Usually the proportional mixer used is a fixed structure, the flow cross section of the medium flowing through the orifice plate is a fixed value, if you want to change the mixing ratio, you must replace the orifice plate with different flow cross section, the outlet end of the proportional mixer has a necked section , which is a typical characteristic of a Venturi tube. The outflow coefficient of the Venturi tube cannot maintain good linearity in a wide range of Reynolds numbers; moreover, the inlet of the foam liquid pipe is arranged perpendicular to the fire water pipe, and the Venturi ejection and suction effect Driven by the pressure of the foam pump and the pressure of the foam pump, the traditional proportional mixer is limited by its structure. When the system pressure changes, the mixing ratio will fluctuate accordingly. It is difficult to find the ideal working point and maintain a relatively stable working status

And the work of replacing the orifice plate is very cumbersome and labor-intensive, so it brings inconvenience to installation and debugging

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