Mechanical diaphragm metering pump is mainly of reciprocating pump, the cylinder number of pump can be divided into single, double cylinder, three cylinder etc.. Diaphragm metering pump zero leakage, high measurement accuracy, low noise, widely used in petroleum, textile and other industries. The diaphragm metering pump is mainly used for conveying flammable, explosive, highly toxic, corrosive and radioactive liquid. The disadvantages of diaphragm diaphragm metering pump is easy to rupture, especially fixed stroke diaphragm pump, once the diaphragm rupture, and fluid metering system of hydraulic oil pollution each other, we need to make the necessary improvements to the diaphragm metering pump.

The working principle of diaphragm metering pump

First, the structure of diaphragm metering pump

Diaphragm metering pump is composed of motor, gear box, cylinder and other three parts, transmission parts are made by the cam organization, Travel Organization conditioning and the ratio of worm gear structure; through rotating handwheel implementing conditioning conditioning tappet trip, from the surface of the diaphragm spacing changes to reach the intention to change the expansion flow. Parts of the cylinder is composed of a pump head. The suction valve, discharge valve group, a diaphragm the diaphragm base.

Two, diaphragm metering pump operation principle

Motor driven by coupling worm and worm gear through the main shaft and the eccentric rotation reversal movement by eccentric wheel drives the tappet reciprocated in the guide tube. Together with the diaphragm through the one-way valve effect to the pump chamber gradually form a vacuum, suction valve open, the inhalation of the liquid; when the diaphragm moves forward dead at the moment, the suction valve closed and the discharge valve is opened, the liquid discharge in the diaphragm driven. In reciprocating pump after conditioning must travel along a series of operations also constitute pressure, liquid quantitative.

Three, flow conditioning characteristics

The pump flow conditioning by rotating the handwheel to drive the rotation of the screw conditioning, conditioning, and then change the distance between the diaphragm tappet, changes in the pump cavity travel to the size of the flow. The resolution scale resolution of diaphragm stroke regulating handwheel, the accuracy rate was ninety-five percent.