What is the working principle of a metering pump?

The working principle of a metering pump is that the motor drives the worm gear through a coupling and reduces the speed through the worm gear, causing the main shaft and eccentric wheel to rotate. The eccentric wheel drives the sliding adjustment seat of the bow shaped connecting rod to perform reciprocating motion. When the plunger moves backward to the dead center, a vacuum gradually forms in the pump chamber, and the suction valve opens to suck in the liquid; When the plunger moves forward to the dead center, the suction valve closes and the discharge valve opens, and the liquid is discharged as the plunger moves further. Under the reciprocating circulation of the pump, a continuous and quantitative discharge of liquid is formed.

In addition, the metering pump mainly consists of an electric motor, a transmission reduction mechanism, a flow control mechanism, and a pump head. Among them, the motor provides power, the transmission reduction mechanism converts the rotational motion of the motor into the reciprocating motion of the plunger, the flow control mechanism is used to regulate the flow, and the pump head is the hydraulic part of the pump, responsible for increasing the liquid pressure.

Overall, a metering pump is a special volumetric pump that can precisely control flow and pressure, and is widely used in various process flows.