The dosing metering pump consists of three parts: motor, transmission box, and cylinder body.

The transmission box components are composed of a cam mechanism, a stroke adjustment mechanism, and a speed ratio worm gear mechanism; By rotating the adjusting handwheel to adjust the stroke of the tappet, the expansion distance of the diaphragm is changed from the surface to achieve the goal of changing the flow rate.

The cylinder body components are composed of pump head, suction valve group, discharge valve group, diaphragm bases, etc. The motor drives the worm gear through a coupling and decelerates it through the worm gear, causing the main shaft and eccentric wheel to rotate. The eccentric wheel drives the tappet to move back and forth in the guide cylinder. Along with the diaphragm, a vacuum is gradually formed in the pump chamber through the action of a one-way valve, and the suction valve opens to suck in the liquid;

When the diaphragm moves forward to the dead center, the suction valve closes, the discharge valve opens, and the liquid is discharged under the push of the diaphragm. The pump operates continuously and quantitatively to discharge liquid by adjusting a certain stroke of reciprocating operation. The flow regulation of a pump relies on rotating the adjustment handwheel to drive the adjustment screw to rotate, thereby changing the spacing between the tappets and changing the travel of the diaphragm in the pump chamber to determine the flow rate. Adjusting the scale of the handwheel determines the diaphragm travel with an accuracy of 95%.

The working principle of the dosing metering pump produced by the metering pump manufacturer:

1. By utilizing the forward and backward movements of the diaphragm, the change between the diaphragm and the pump head causes the ball valve to move up and down, resulting in vacuum adsorption and pushing to achieve the purpose of liquid transportation.

1. When the diaphragm is pulled back, the outlet ball valve falls down and tightly fits with the ball seat. The inlet ball valve floats up due to the vacuum generated between the diaphragm and the pump head when pulled back, and the liquid is sucked up accordingly.

2. When the diaphragm is pushed forward, the inlet ball valve and ball seat are airtight, preventing liquid from passing through, while the outlet valve opens due to the diaphragm being pushed forward, causing liquid to be expelled.