1. Classify by the number of impellers in the homework

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

② Multi stage pump: refers to a pump with two or more impellers on the pump shaft, and the total head of the pump is the sum of the heads generated by n impellers.

2. Classify by homework pressure

① Low pressure pump: pressure below 100 meters of water column;

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

③ High pressure pump: pressure above 650 meters of water column. (Multi stage centrifugal pump can reach 2800m)

3. Classify by impeller inlet method

① Single side inlet pump: also known as single suction pump, which means there is only one inlet on the impeller;

② Double inlet pump: also known as double suction pump, which means there is an inlet on both sides of the impeller. It has a flow rate twice that of a single suction pump and can be approximated as two single suction pump impellers placed back-to-back.

4. Classify according to the joint method of the pump casing

① Horizontal open type pump: that is, there is a joint seam on the horizontal plane passing through the axis line. (The common horizontal open pump is a double suction pump)

② Straight joint surface pump: that is, the joint surface is straight with the axis line.

5. Classify by pump shaft position

① Horizontal pump: The pump shaft is located in a horizontal position.

② Vertical pump: The pump shaft is located in a straight position.

6. Classify according to the way the water from the impeller is directed towards the extrusion chamber

① Spiral shell pump: After water comes out of the impeller, it directly enters the pump casing with a spiral shape.

② Guide vane pump: After water comes out of the impeller, it enters the guide vanes set outside it, and then enters the next or outlet pipe. (Commonly used for multi-stage pumps and axial flow pumps)

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