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What effect does the speed of the diesel water pump motor have on the water pump?

What effect does the speed of the diesel water pump motor have on the water pump?

Because the water pump is driven by the engine, the speed of the water pump is directly related to the speed of the engine.
(1) Impact on pump lift
Commonly used motors for water pumps are 2-pole, 4-pole, 6-pole, geared motors and speed-regulating motors. The same type of water pump is maintained at a certain flow rate. The lower the motor speed, the lower the pump head and the lower the outlet pressure. Therefore, high-head pumps generally choose 2-pole motors, and low-head pumps choose 4-pole and 6-pole motors. The motor speed is typically used in pipeline centrifugal pumps.
(2) Impact on pump flow
The flow rate of the water pump maintains a certain pressure at the outlet, and the higher the speed, the greater the flow rate of the water pump. In order to reduce the flow rate of the single-stage single-suction centrifugal pump of the same model, the diameter of the impeller is cut instead of a smaller motor in the process. Because the low-speed motor will reduce the flow and pressure at the same time, it is difficult to meet the same process requirements.
(3) Impact on pump efficiency
The efficiency of the water pump marks the performance of the water pump and also reflects the utilization of the engine by the water pump. The motor speed of the centrifugal water pump has a disproportionate effect on the efficiency. On the contrary, the smoothness of the pump body, the tightness of the seal, and the arrangement of the pipeline affect the overall efficiency of the pump.

The flow rate of the water pump, that is, the water output, generally should not be selected too large, otherwise it will increase the cost of purchasing the water pump, and should be selected according to actual needs. For example, for the self-priming water pump used in the user’s home, the flow rate should be as small as possible, and the user can choose a larger flow rate if it is used for irrigation.
1) Purchase water pumps according to local conditions. There are 3 types of commonly used agricultural water pumps, namely centrifugal water pumps, axial flow water pumps and mud water pumps. The centrifugal pump has a high head, but the water output is not large, and is suitable for mountainous areas and well irrigation areas; the axial flow pump has a large water output, but the head is not too high, and is suitable for use in plain areas; the water output and the head of the mud pump are between the centrifugal pump Between the axial flow pump and the axial flow pump, it is suitable for plain and hilly areas.
2) Select water pumps that exceed the standard appropriately. After determining the type of water pump, it is necessary to consider its economic performance, especially the head and flow rate of the water pump and the selection of its supporting engine.

It must be noted that the head (total head) indicated on the nameplate of the pump is different from the discharge head (actual head) during use. This is because there will be a certain resistance loss when the water flows through the water pipe and the vicinity of the pipeline. Therefore, the actual head is generally 10%-20% lower than the total head, and the water output is also reduced accordingly.
Therefore, in actual use, it can only be estimated by 80% to 90% of the head and flow stated on the nameplate. The selection of the engine for the pump can be selected according to the power indicated on the nameplate. In order to make the pump start quickly and use safe, the engine’s The power can also be slightly larger than the power required by the pump. Generally, it is better to be higher than 10%; if you have an engine, when you choose a water pump, you can choose a matching water pump according to the power of the engine.