Structure and Working Principle of Oval Gear Flow Meter

The oval gear flow meter consists of a flow transmitter and a counting mechanism. By adding a heat sink between the transmitter and the counting mechanism, it forms a high-temperature flow meter. The transmitter is composed of a measuring chamber containing a pair of elliptical rotor gears and a sealed coupling, while the counting mechanism includes a reduction mechanism, an adjustment mechanism, a counter, and a signal transmitter.

Inside the measuring chamber, a pair of elliptical gears and a cover plate form a crescent-shaped cavity, which serves as the measurement unit for the flow. The elliptical gears are driven to rotate by the pressure difference between the inlet and outlet of the flow meter, continuously measuring the liquid through the crescent-shaped cavity and delivering it to the outlet. Each rotation displaces a volume of liquid equal to four times the crescent-shaped cavity. The sealed coupling transmits the total number of rotor turns and the rotation speed to the counting mechanism or the signal transmitter, allowing for accurate determination of the total liquid volume and instantaneous flow in the pipeline.