Centrifugal pumps and self-priming pumps are two different types of pumps, and their working principles and structures are different.

a centrifugal pump, as its name implies, is a pump that uses centrifugal force to transport water or other liquids. Its main structure includes impeller, pump shell, shaft, bearing and seal. When the motor drives the impeller to rotate at high speed, the liquid also rotates and is thrown to the periphery of the pump casing, forming pressure and flow, thus achieving the purpose of conveying liquid. Centrifugal pumps are widely used in industry, construction, agriculture and other fields.

Self-priming water pump is a pump that sucks water or other liquids by negative pressure. Its main structure includes pump body, impeller, deflector, isolation chamber and negative pressure chamber. There is a negative pressure chamber in the pump body of the self-priming water pump. The liquid forms a vortex through the deflector in the pump body, and water or other liquid is sucked and delivered by using the centrifugal force and negative pressure generated by the vortex movement. Self-priming pumps are widely used in rural life, garden irrigation and other occasions.

In a word, the main difference between them lies in their different working principles and structures, and they are suitable for different occasions and uses.