Centrifugal pump is a pump that relies on the centrifugal force generated when the impeller rotates to transport liquid. Before the pump is started, the pump casing and suction pipe must be filled with water, and then the motor is started, which makes the pump shaft drive the impeller and water to do high-speed rotational movement, and the water will undergo centrifugal movement and be thrown to the outer edge of the impeller, and flow into the pressure pipe circuit of the pump through the flow channel of the worm-shaped pump casing. Let's introduce the types of centrifugal pumps.
Types of centrifugal pumps
The number of impellers
- Single-stage pump: There is only one impeller on the pump shaft.
- Multi-stage pump: there are two or more impellers on the pump shaft when the total head of the pump is the sum of the heads produced by n impellers.
- Low-pressure pump: pressure below 100 m water column.
- Medium-pressure pumps: pressure between 100 and 650 meters of the water column.
- high-pressure pump: pressure higher than 650 m water column.
Impeller suction method
- Single-side inlet pump: single-suction pump, with only one inlet on the impeller.
- Double-side inlet pump: double-suction pump with one inlet on both sides of the impeller.
>Pump casing bonding
- Horizontal center-opening pump: There is a bonding seam on the horizontal surface through the axis line.
- Vertical combination surface pump: the combination surface is perpendicular to the axis line.
Pump shaft position
- Horizontal centrifugal pump: the pump shaft is located in the horizontal position.
- Vertical centrifugal pump: the pump shaft is located in the vertical position.
Impeller out of the way
- Worm shell pump: water from the impeller out, directly into the pump casing with the shape of the spiral line.
- Guide lobe pump: water comes out of the impeller and enters the guide lobe outside, then enters the next level or flows into the export pipe.
- Self-inflating centrifugal pump: the pump shaft is lower than the surface of the suction pool, no need to irrigate when starting, can automatically start.
- Suction centrifugal pump (non-self-infusion centrifugal pump): the pump shaft is higher than the suction pool surface. Before starting, it is necessary to fill the pump casing and suction pipe with water, then drive the motor to make the impeller rotate at high speed, the water is thrown out of the impeller by centrifugal force, and the negative pressure is formed in the center of the impeller, and the water in the suction pool enters the impeller under the action of atmospheric pressure and is thrown out of the impeller into the pressure pipe by the action of the impeller rotating at high speed.