Liquid proportion mixing device

Abstract

The invention discloses a liquid proportion mixing device which comprises a water inlet, a water outlet and a displacement pump of an impeller; a rotating shaft of the impeller is in transmission connection with a driven displacement pump at least, the driven displacement pump is provided with a liquid inlet and a liquid outlet which are independent of each other, and the liquid outlet is connected with a water outlet of the displacement pump through a liquid pipeline; a three-way control valve is arranged between the liquid outlet and the liquid pipeline, and the outlet end of the three-way control valve is connected with the liquid inlet of the driven displacement pump through a bypass pipeline; the liquid inlet of the driven displacement pump is connected with the water inlet through a pipeline and a backwash valve. The liquid proportion mixing device has the benefits that the liquid proportion mixing device adopts a synchronous transmission structure, in particular to a coaxial transmission structure, and the stable and adjustable mixture of a plurality of liquid in proportion is realized in combination of the bypass pipeline and the three-way control valve; with the adoption of the coaxial transmission structure, the hydraulic loss of the liquid proportion mixing device is not more than 20 percent, the mixing efficiency is high, and the proportional control range is large and accurate; the liquid proportion mixing device can also be used for back-washing the driven displacement pump, the cleanness and the normal service of equipment are ensured, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the field of design and manufacture of fire-fighting equipment, in particular to the field of design and manufacture of mixing equipment for foam and water fire-fighting, and particularly relates to a liquid proportional mixing device. Background technique [0002] In fire extinguishing equipment, foam and water mixing are often used to extinguish multiple types of fires. The foam fire extinguishing system has the characteristics of safety, reliability, economy and practicality, and high fire extinguishing efficiency. Especially, class A foam is used to extinguish solid fires, and class B foam is used to extinguish class B fires. Fire has more prominent advantages, and it is the basic way to fight solid and oil fires at home and abroad. The foam proportional mixer is the "nerve center" of the foam fire extinguishing system, and its working performance is directly related to the success or failure of the foam fire extinguishing ...

AI Technical Summary

Problems solved by technology

[0005] The traditional proportional mixer will cause the water pressure loss of the mainstream medium to reach 35%, and the efficiency is low; when in use, when the flow and pressure of the main pipeline change greatly, the proportional accuracy of the sucked liquid will be greatly reduced, and the proportional error is ≧±30% , affecting the fire extinguishing efficiency

Images