Before understanding the difference between a multistage centrifugal pump and a single-stage centrifugal pump, we must first figure out what is a multistage centrifugal pump and what is a single-stage centrifugal pump. A multi-stage centrifugal pump is a collection of two or more centrifugal pumps with the same function. In terms of fluid channel structure, the medium pressure relief port of the first stage communicates with the inlet of the second stage, and the medium pressure relief port of the second stage is connected to the inlet of the second stage. It communicates with the inlet of the third stage, and the mechanism in series in this way forms a multistage centrifugal pump. Generally speaking, a multi-stage centrifugal pump is more than two impellers connected in series, while a single-stage centrifugal pump has only one impeller, which is connected to the motor through a lengthened elastic coupling. The rotation direction of the pump, viewed from the driving end, is clockwise rotate. So what is the difference between a multi-stage centrifugal pump and a single-stage centrifugal pump? The following is a detailed explanation.
Difference between multistage centrifugal pump and single stage centrifugal pump
First of all, a single-stage centrifugal pump must be the basis of a multi-stage centrifugal pump. Both are centrifugal pumps. The impellers of the same specification and size are connected in series and installed in the same pump to form a multi-stage centrifugal pump.
1. Therefore, the obvious difference between the two lies in the impeller. The single-stage centrifugal pump has only one impeller, and the multi-stage centrifugal pump has more than two impellers. The single-stage centrifugal pump refers to the pump with only one impeller, and the lift is only 125 meters;
2. A multi-stage centrifugal pump refers to a pump with two or more impellers, and its head can exceed 125 meters; when a single-stage pump head needs to be equipped with a two-stage motor, the multi-stage pump can increase the number of impellers. Equipped with a four-stage motor, it can improve the service life of the pump and reduce the noise of the unit, but the maintenance of multi-stage pumps is more difficult than that of single-stage pumps.
3. The pressure is formed by superimposing the impellers of each stage. The difference between the single-stage and multi-stage centrifugal pump impellers results in the difference in pressure between the two. The single-stage centrifugal pump has low pressure and high flow rate, while the multi-stage centrifugal pump has high pressure and low flow rate.
4. The head of multistage centrifugal pump is high, and the axial force is larger than that of single stage pump. The head of single stage centrifugal pump is lower than that of multistage centrifugal pump, but the flow rate is large and the pressure is low.
5. When the actual head of the pump is less than 125 meters, the choice of single-stage centrifugal pump or multi-stage centrifugal pump can be comprehensively considered according to the pump room area, pump price (multi-stage centrifugal pumps are generally higher than single-stage centrifugal pumps), and other factors. Pump.
Post time: Nov-18-2022