Gear oil pumps are generally driven by electric motors

Gear oil pump; Generally driven by an electric motor, the pump body and suction pipeline are filled with liquid before starting the pump. When the impeller rotates at high speed, it drives the liquid between the blades to rotate together. Due to the centrifugal force, the liquid is thrown from the center of the impeller to the outer edge of the impeller (the flow velocity can increase to 15-25m/s), and the kinetic energy also increases accordingly. When the liquid enters the pump casing, due to the gradual expansion of the flow channel in the volute shaped pump casing, the liquid flow velocity gradually decreases, and a part of the kinetic energy is converted into static pressure energy, so the liquid flows out along the discharge outlet at a higher pressure. At the same time, a vacuum is formed at the center of the impeller due to the liquid being thrown out, and the pressure Pa at the liquid level is higher than that at the center of the impeller. Therefore, the liquid in the suction pipeline enters the pump under the pressure difference. The impeller keeps rotating, and the liquid is continuously sucked in and squeezed out.