How to improve the efficiency of multistage centrifugal pump?

Category: Water pump knowledge

2024-06-03

The efficiency of multi-stage centrifugal pump is not single, it is the product of mechanical, volume and hydraulic efficiency. The reason for the reduction of multi-stage centrifugal pump efficiency is the source problem we want to understand. Only by clarifying this problem can we find effective measures to improve the efficiency of multi-stage centrifugal pump.

Factors affecting the efficiency of multistage centrifugal pumps:

The quality of design and manufacture directly affects the mechanical efficiency of multi-stage centrifugal pumps;

2, hydraulic loss, hydraulic friction, local resistance loss will cause the reduction of efficiency;

The efficiency of the multi-stage pump itself is a fundamental influence. Under the same working conditions, the efficiency of different multi-stage pumps may differ by more than 15%;

4. When the operating conditions of the multi-stage centrifugal pump are lower than the rated conditions of the pump, the pump efficiency is low and the energy consumption is high;

5. Staff's work mistakes, failure to make preparations before use, incomplete implementation of basic operation procedures such as disc pumps and filling pumps, often cause cavitation of pumps, causing large pump noise, large vibration and low pump efficiency.

6, multi-stage centrifugal pump volume loss (leakage loss), which also includes the impeller seal ring, inter-stage, axial force balance three. The leakage of several components has a significant impact on the efficiency of multistage centrifugal pumps;

7. The filter cylinder is blocked, the pipeline air intake, etc. will cause the multi-stage centrifugal pump to be evacuated or idling, which will also affect the efficiency;

8. The efficiency of the motor will basically remain unchanged during the application process, and the efficiency of the motor is an important factor affecting the efficiency of the multi-stage centrifugal pump;

Methods to improve the operating efficiency of self-balancing multistage pumps:

1, replace the inefficient centrifugal pump. When replacing, the centrifugal pump which is close to the actual operating condition parameters is selected to ensure that the replaced pump is always running in an efficient state. We have done the efficiency comparison experiment before and after the replacement of centrifugal pump. The experiment shows that the pump efficiency can be improved by about 10% after replacing the inefficient and high consumption centrifugal pump.

2. Regularly check the pump efficiency of the self-balancing multi-centrifugal pump. For the pump group with low pump efficiency, find the reason in time and take corresponding measures to solve it.

3. Clean the filter cylinder regularly and check the pipeline connection to ensure the smooth flow of the centrifugal pump inlet pipeline.

4. Maintenance of centrifugal pump. (1) Always check and adjust the shaft end seal of the centrifugal pump to reduce the volume loss;(2) When the centrifugal pump has been running for 10000 h, it should be overhauled to restore the pump efficiency;(3) Promote the application of bellows sealing technology on centrifugal pumps to completely eliminate centrifugal pump leakage and improve volumetric efficiency.

5, in strict accordance with the centrifugal pump operating procedures, before starting the pump to disk pump, open the inlet valve, close the outlet valve, exhaust vent, check whether the inlet pressure of the pump meets the requirements. To prevent the pump cavitation caused by low hydraulic pressure and insufficient flow.

6. Selection of centrifugal pump. When selecting a new pump, the pump produced by a large factory should be selected to ensure the high efficiency of the centrifugal pump.

7. Application of frequency conversion energy saving technology. For the centrifugal pump whose design parameters are greater than the actual operating conditions, after installing the frequency conversion speed regulation device, it always runs in the high-efficiency area.

8. Promote the application of high-efficiency and energy-saving permanent magnet speed-regulating motors and dual-power motors and other new energy-saving products on major centrifugal pumps.

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