The difference between multistage centrifugal pump and single stage pump
Compared with single-stage pumps, the difference is that multi-stage pumps have more than two impellers, which can absorb and press water in multiple stages, so as to raise the water to a very high position. The head can be increased or decreased according to needs. The number of stages of the pump impeller. Multi-stage pumps are mainly used for mine drainage, urban and factory water supply. Agricultural irrigation is rarely used. It is only suitable for high-lift, small-flow high-mountainous water pumping to solve the difficulty of drinking water for humans and animals. There are two types of multi-stage high heart pumps, vertical and horizontal. The main models are D-type and DL-type multi-stage centrifugal pumps, and DW and DWL-type small multi-stage centrifugal pumps.
(1) The performance range of D-type multi-stage pumps: Flow rate 6.3～720 cubic meters/hour, head 16～600 meters, water inlet diameter: 50, 75, 100, 125, 150, 200 mm, of which 50～125 mm pump type is The high speed is 2950 rpm, and the speed of 150～200mm pump is 1480 rpm.
(2) Structural type D-type multistage centrifugal pump is horizontal multistage (2-12 stages), the impeller is single suction, and the pump body is segmented. When the first-stage impeller is double suction, it is indicated by DS. When two speeds are specified at the same time, the low speed is indicated by DA. The multi-stage centrifugal pump used for boiler feed water is indicated by DG.
1. A single-stage pump refers to a pump with only one impeller, with a maximum head of only 125 meters;
2. Multi-stage pump refers to a pump with two or more impellers, which can absorb and press water in multiple stages, so as to raise the water to a very high position. The head can be increased or decreased according to needs. The number of stages; multi-stage pumps must be equipped with a two-stage motor for a single-stage pump head, and a four-stage motor can be used by increasing the number of impellers, which can increase the service life of the pump and reduce the noise of the unit.
3. When the actual pump head is less than 125 meters, you can consider whether to choose a single-stage pump or a multi-stage pump according to the pump room area, pump price (multi-stage pumps are generally higher than single-stage pumps), and other factors.
