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# Classification Of Centrifugal Pumps

Aug 29, 2018

First, classify according to the number of impeller.

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, at this time the total head of the pump is the sum of n impellers.

Multistage centrifugal pump

Multistage centrifugal pump

Two. Classify according to work pressure.

1, low pressure pump: pressure less than 100 meters water column;

2, medium pressure pump: pressure between 100~650 meters of water column;

3, high pressure pump: pressure is higher than 650 meters water column.

Three. Classify by impeller inhalation.

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

2, double inlet pump: also called double suction pump, that is, both sides of the impeller have an inlet. Its flow rate is twice as large as that of a single-suction pump, and can be approximately regarded as two single-suction pump impellers placed back to back together.

Four. Classify according to the combination of pump and shell.

1, horizontal open pump: that is, there is a joint seam on the horizontal plane through the axis line.

2, vertical joint surface pump: the joint surface is perpendicular to the axis line.

Five. Classify according to the position of pump shaft.

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

Horizontal pump

Horizontal pump

2, vertical pump: the pump shaft is located in the vertical position.

Six. Classify according to impeller outlet mode.

1. Volute pump: after the water comes out of the impeller, it directly enters the pump shell with spiral shape.

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

Seven. Classification according to installation height.

1, self filling centrifugal pump: the pump shaft is lower than the surface of the sump pool. When it is started, it does not need irrigation, and it can start automatically.

2, suction centrifugal pump (non self filling centrifugal pump): the pump shaft is higher than the water tank surface. Before starting, it is necessary to fill the pump shell and suction pipe with water first, then drive the motor to make the impeller rotate at high speed. Water is thrown out of the impeller by centrifugal force, and the center of the impeller forms a negative pressure. 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 water pipe by the action of high-speed rotating impeller. Avenue.

In addition, according to the use can also be classified, such as oil pumps, pumps, condensate pumps, ash pumps, circulating water pumps.