The multi-stage pump is a centrifugal pump that combines the inlet and outlet sections and the middle section through a pull rod. Its output water pressure can be very large, and it also relies on the rotation of the impeller to obtain centrifugal force, thereby material. When the gas density reaches the working range of the mechanical vacuum pump, it is pumped out, so as to gradually obtain a high vacuum.

The multi-stage pump realizes suction, compression and exhaust by the change of the volume of the pump cavity, so it is a centrifugal pump with variable volume.

The difference between multi-stage pump and single-stage pump

✅Single Stage Pump

Single stage pump, impeller and volute generate pressure. The pressure generated by the merger of the impeller and the volute depends on the diameter of the impeller and the speed at which the impeller rotates. For single-stage pumps, the impeller is the only element that transfers energy to the pumped liquid. As long as the impeller is in contact with the pumped fluid, it will have the energy to transport the fluid, so the diameter of the impeller is very important to the performance of the pump.

For a particular pump, there is an optimum impeller diameter at which the pump operates at its optimum efficiency. There is also a Most Efficient Flow and Head Pump Mission (BEP).

From the performance curve of the single-stage pump, if the pump speed is changed, the pump efficiency runs with the speed, and when the pump speed increases, the pump operation curve moves to the upper left to reduce the pumping flow and head. When the pump's curve is flat, the pressure is inversely proportional to the pump's flow, and an absolutely small change in pressure produces a large change in fluid.

✅Multistage Pump

Pressure is generated using a multi-stage pump with multiple series of impellers and volutes. The pumped fluid exits the impeller and volute (called a stage) and immediately enters the next impeller and volute. The pressure of the multistage pump depends on the impeller, the number of application stages, the speed of the impeller, and the diameter of the steering. In multistage pumps, the impeller diameter is usually not trimmed to accomplish the required mission conditions.

Furthermore, since there are multiple impellers for transferring the required energy into the pumped liquid, each impeller and worm combination can be a smaller diameter with a smaller gap between the impeller and the worm. Due to the tight clearance between the impeller and the volute, multi-stage pumps are not recommended for pumping liquids containing solid particles or for pumping viscous materials.

The result of this tight tolerance between the impeller and the worm gear volute is that each stage of the impeller operates close to its optimum hydraulic effect. The number of impellers of multistage pumps varies with operating conditions.

Within the hydraulic pressure range, the performance of the multistage pump is suitable under various working conditions. If more pressure is required, join the remaining stages (impeller + volute combination), if the pressure is lower, choose a smaller stage pump.

Compared to single-stage pumps, the shape of this curve is dominant, especially when the operation of multi-stage pumps is dictated by speed. When trying to grasp the basic system pressure operation of the pump, it is easier to grasp the flat curve associated with the pump. Pump-to-pump curves are flat, and a gentle curve will not have small pressure changes that correspond to large flow changes.

When stepless speed regulation is adopted, the speed of the single-stage pump can only be reduced by about 5% (3319rpm and 3500rpm). Similarly, the speed of the multi-stage pump is reduced by more than 17% (2882rpm and 3500rpm), the efficiency is increased by 37%, and it can operate under the condition of energy saving and emission reduction and lower operating conditions.

Multi-stage pumps are more suitable for mine drainage, urban and factory water supply, and are rarely used for agricultural irrigation. They are only suitable for high lift and small flow in high mountain areas to solve the difficulty of drinking water for humans and animals.

Conclusion

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