kind
一. Classification according to the number of impellers
1. Single-stage pump: 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 the heads generated by n impellers.
二. Classification by working pressure
1. Low-pressure pump: the pressure is less than 100 meters of water column;
2. Medium-pressure pump: the pressure is between 100 and 650 meters of water column;
3. High-pressure pump: The pressure is higher than 650 meters of water column.
三. Classification according to the impeller suction method
1. Single-side 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 double that of a single-suction pump, and it can be roughly regarded as the two single-suction pump impellers placed together back to back.
四. Classification by combination of pump casing
1. Horizontal mid-open pump: there is a joint seam on the horizontal surface passing through the axis line.
2. Vertical joint surface pump: the joint surface is perpendicular to the axis.
五. Classification according to the position of the pump shaft
1. Horizontal pump: The pump shaft is in a horizontal position.
2. Vertical pump: the pump shaft is in a vertical position.
六. Classification according to the way of impeller out
1. Spiral casing pump: After the water comes out of the impeller, it directly enters the spiral casing.
2. Guide vane pump: After water comes out of the impeller, it enters the guide vane outside it, and then enters the next stage or flows into the outlet pipe.
七. Classification by installation height
1. Self-irrigation centrifugal pump: The pump shaft is lower than the surface of the suction tank. It does not need irrigation when starting, and can be automatically started.
2. Suction centrifugal pump (non-self-filling centrifugal pump): The pump shaft is higher than the suction pool surface. Before starting, the pump casing and suction pipe need to be filled with water, and then the motor is driven to rotate the impeller at high speed. The water is thrown out of the impeller by the centrifugal force, and the center of the impeller forms a negative pressure. Being impelled by the high-speed rotating impeller, the impeller is thrown out and enters the pressurized water pipeline.
In addition, it can also be classified according to the application, such as oil pump, water pump, condensate pump, ash discharge pump, circulating water pump, etc.
