Types of Centrifugal Pump

First. Classification by impeller number 

1. Single-stage pump: that is, there is only one impeller on the pump shaft. 

2. Multi-stage pump: that is, there are two or more impellers on the pump shaft, and the total lift of the pump is the sum of the lifts generated by n impellers.

 Second, classified according to work pressure 

1. Low-pressure pump: the pressure is less than 100m H2O;

 2. Medium pressure pump: the pressure is between 100 and 650 meters of water column; 

3. High-pressure pump: the pressure is higher than 650m H2O. Third, classified according to impeller suction mode 

1. Unilateral water inlet pump: also called single suction pump, that is, there is only one water inlet on the impeller; 

2. Double-side water inlet pump: also called double suction pump, that is, there is a water inlet on both sides of the impeller. Its flow rate is twice as large as that of single-suction pump, which can be approximately regarded as two single-suction pump impellers put together back to back.

Four, according to the combination of pump shell classification

1. Horizontal middle-open pump: that is, there is a joint on the horizontal plane passing through the axis.

2. Vertical joint surface pump: that is, the joint surface is perpendicular to the axis.

Five, according to the pump shaft position to classify

1. Horizontal pump: the pump shaft is in a horizontal position.

2. Vertical pump: the pump shaft is in a vertical position.

Six, according to the impeller way classification

1. Volute pump: After the water comes out of the impeller, it directly enters the spiral pump casing.

2. Guide vane pump: After the water comes out of the impeller, it enters the guide vane set outside it, and then enters the next stage or flows into the outlet pipe.

Seven, according to the installation height classification

1. Self-priming centrifugal pump: the pump shaft is lower than the pool surface of the suction pool, and it can be started automatically without irrigation.

2. Suction centrifugal pump (non-self-priming centrifugal pump): the pump shaft is higher than the pool surface of the suction pool. Before starting, it is necessary to fill the pump casing and suction pipe with water first, and then drive the motor to make the impeller rotate at high speed. The water is thrown out of the impeller under centrifugal force, and negative pressure is formed in the center of the impeller. The water in the suction pool enters the impeller under the action of atmospheric pressure, and is thrown out of the impeller into the water pressure pipe under the action of the high-speed rotating impeller.In addition, it can be classified according to the purpose, such as oil pump, water pump, condensate pump, ash pump, circulating water pump, etc.