The gear metering pump is a pair of gears that mesh with each other, one of which is the driving gear, and the other is the passive gear, which is driven by the driving gear to rotate. The gear has a small gap directly in the pump casing. When the gear rotates, in the suction chamber where the gear teeth are gradually disengaged, the enclosed volume between the teeth increases, forming a partial vacuum, and the liquid is sucked into the suction chamber under the action of the pressure difference. As the gear rotates, the liquid divides into two paths in the gear The gear is pushed forward by the gear and sent to the liquid discharge chamber. In the liquid discharge chamber, the two gears gradually mesh, the volume decreases, and the liquid between the gears is squeezed to the liquid discharge port.

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