Dosing metering pump is composed of motor, gear box and cylinder body. Gear box is composed of worm gear mechanism, stroke adjusting mechanism and crank connecting rod mechanism. By turning the adjusting handwheel to achieve high adjustment stroke, so as to change the eccentricity distance of the moving shaft, in order to achieve the purpose of changing the plunger (piston) stroke.

The cylinder block consists of a pump head, an suction valve group, an discharge valve group, a plunger and a rotary seal.

The motor drives the worm through the shaft coupling, and the worm gear reduces the speed of the main shaft and the eccentric gear, the eccentric gear drives the bow connecting rod rolling adjustment seat to move repeatedly. When the plunger is moved back to the dead point, a vacuum is gradually formed in the pump chamber, and the suction valve is opened to inhale the liquid; When the plunger moves forward to the dead point, the suction valve is closed, the discharge valve is opened, and the liquid is discharged when the plunger moves further. The reciprocating cycle of the pump produces a continuous and quantitative discharge of liquid.

Analysis of flow regulation process of dosing meter pump:

1, adjust the dosing metering pump plunger stroke 

The greater the plunger stroke, the greater the flow of the metering pump (at the rate). The stroke can be controlled by manually adjusting the meter or automatically adjusted by the stroke controller. At present, manual adjustment is used more frequently.

2, adjust the motor speed

When the plunger stroke is determined, the flow rate can be adjusted by adjusting the motor speed, and the motor speed can be controlled by matching the variable frequency motor or by external signals (such as 4-20ma signals). The specific conditions should be determined according to the site conditions. Dosing metering pump includes plunger dosing pump, diaphragm dosing pump and electromagnetic dosing pump. The structure of the electromagnetic metering pump is relatively small and the flow pressure is low. The principle of flow regulation is basically the same as above.

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