Working principle and type of submersible pump

Submersible pumps refer to pumps that need to be put into the water to pump water, also known as submersible pumps. It is a machine that transports liquid or pressurizes liquid. It transmits the mechanical energy of the prime mover or other external energy to the liquid to increase the energy of the liquid. It is mainly used to transport liquids including water, oil, acid and alkali, emulsion, suspoemulsion and liquid metal.

working principle

The impeller is installed in the pump casing and fastened on the pump shaft, which is directly driven by the motor. There is a liquid suction tube in the center of the pump housing. The liquid enters the pump through the bottom valve and the suction pipe. The liquid discharge port on the pump casing is connected with the discharge pipe.

Before the submersible pump is started, the pump casing is filled with the liquid to be transported; after the start, the impeller is driven by the shaft to rotate at high speed, and the liquid between the blades must also rotate accordingly. Under the action of centrifugal force, the liquid is thrown from the center of the impeller to the outer edge and gains energy, leaving the outer edge of the impeller at high speed and entering the volute pump casing. In the volute, the liquid decelerates due to the gradual expansion of the flow channel, and converts part of the kinetic energy into static pressure energy, and finally flows into the discharge pipe at a higher pressure and is sent to the required place. When the liquid flows from the center of the impeller to the outer edge, a certain vacuum is formed in the center of the impeller. Since the pressure above the liquid level of the storage tank is greater than the pressure at the pump inlet, the liquid is continuously pressed into the impeller. It can be seen that as long as the impeller continues to rotate, the liquid will be continuously sucked and discharged.