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There are many classifications of centrifugal pumps, which are based on different structural characteristics.
1、 Classified by the number of working impellers
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, where the total head of the pump is the sum of the heads generated by n impellers.
2、 Classified by work pressure
1. Low pressure pump: pressure below 100 meters of water column;
2. Medium pressure pump: pressure between 100 to 650 meters of water column;
3. High pressure pump: The pressure is higher than 650 meters of water column.
3、 Classification by impeller inlet method
1. Single side inlet pump: also known as a single suction pump, where there is only one inlet on the impeller;
2. Double sided suction pump: also known as a double suction pump, which means there is a water inlet on both sides of the impeller. Its flow rate is twice that of a single suction pump, which can be roughly seen as two single suction pump impellers placed back to back together.
4、 Classify according to the joint form of pump casing
1. Horizontal split type pump: refers to a joint seam opened on the horizontal plane passing through the axis.
2. Vertical joint surface pump: that is, the joint surface is perpendicular to the axis.
5、 Classification by pump shaft position
1. Horizontal pump: The pump shaft is in a horizontal position.
2. Vertical pump: The pump shaft is located in a vertical position.
6、 Classification based on the way the water from the impeller is directed towards the pressure chamber
1. Volute 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 stage or flows into the outlet pipe.
Usually, when we say a certain water pump belongs to a multi-stage pump, it refers to the number of impellers. According to other structural features, it may also be a horizontal pump, vertical junction surface pump, guide vane pump, high-pressure pump, single side inlet pump, etc. So depending on the difference, the nomenclature varies. In addition, it can also be classified according to its purpose, such as oil pumps, water pumps, condensate pumps, ash discharge pumps, circulating water pumps, etc.
