How does the self-priming principle of the Self-Priming Centrifugal Pump work?
Publish Time: 2025-02-17
The Self-Priming Centrifugal Pump is widely used in many fields such as industry, agriculture and daily life. Its notable feature is that it has self-priming ability and can automatically suck liquid into the pump without an additional vacuum device.
Preparation before starting
Before starting the Self-Priming Centrifugal Pump, a certain amount of liquid needs to be poured into the pump body. This part of the liquid is called "priming liquid". The priming liquid fills the suction chamber of the pump and the flow channel of the impeller, creating conditions for the subsequent self-priming process.
Impeller rotation forms a vacuum
When the motor drives the impeller to rotate at high speed, the liquid in the impeller is thrown to the edge of the impeller under the action of centrifugal force and enters the discharge pipe through the flow channel of the pump casing. As the liquid is continuously thrown out, a low-pressure area, that is, a vacuum area, is formed in the center of the impeller. Due to the existence of this vacuum area, a pressure difference is generated between the suction pipe of the pump and the outside atmosphere. Under the action of atmospheric pressure, the external liquid will be continuously pressed into the pump along the suction pipe.
Gas-liquid mixing and separation
During the self-priming process, there will be a mixture of gas and liquid in the pump. The special design of the Self-Priming Centrifugal Pump enables the gas-liquid mixture to be fully mixed and separated in the pump body. After the gas-liquid mixture enters the separation chamber, due to the different densities of gas and liquid, the gas rises and gathers in the upper part of the separation chamber, while the liquid settles in the lower part. When the liquid in the separation chamber reaches a certain height, it will return to the impeller inlet through the reflux hole and participate in the gas-liquid mixing and separation process again. As this process continues to cycle, the gas in the suction pipe is gradually discharged, and the liquid is continuously inhaled, and finally the self-priming function of the pump is realized.
Achieving a stable working state
When all the gas in the pump is discharged and the liquid fills the entire pump body and the suction pipe, the self-priming process ends and the Self-Priming Centrifugal Pump enters a stable working state. At this time, the impeller continues to rotate, continuously sucking in and discharging the liquid, thereby realizing continuous liquid delivery.
The Self-Priming Centrifugal Pump cleverly achieves the self-priming function through a series of processes such as pre-priming, impeller rotation to form a vacuum, gas-liquid mixing and separation, providing a convenient and efficient solution for various liquid delivery scenarios.
