Water pumps are relatively common fluid components in daily life, and their selection has become a norm; Water pump is an indispensable product in the life and production process! Today, Naiquan Pump Manufacturing Group analyzes the three major issues that should be paid attention to when selecting pump applications: lift, flow, and power.
Lift requirements:
The so-called lift refers to the required lift, not the water lift height, which is particularly important for selecting a pump. The pump lift is approximately 1.15 to 1.20 times the water lift height. If the vertical height from a water source to the water consuming point is 20 meters, the required lift is about 23 to 24 meters. (Guangliang's friendship reminds us that laying a flat pipe for 20m consumes 1m of lift, and three elbows consume 1m of lift.)
When selecting a pump, Guangliang should ensure that the lift on the pump nameplate is close to the required lift, with a general deviation of no more than 20%. In this case, the pump has the highest efficiency, is also relatively energy-saving, and is more economical to use. If the lift on the nameplate is far less than the required lift, the water pump often cannot meet the needs of users, and even if it can pump water, the amount of water is pitifully small. On the other hand, when a high lift water pump is used for a low lift, excessive flow will occur, leading to overload of the motor. If the motor is operated for a long time, the temperature of the motor will rise, and the winding insulation layer will gradually age, or even burn down the motor.
Flow requirements:
The flow rate of the water pump, that is, the water output, should not be too large, otherwise it will increase the cost of purchasing the pump, and should be selected as needed Guangliang's years of experience (increased flow rate - increased lift - overload firing, increased lift - increased flow rate - overload firing of water pumps.) Of course, this is only the worst case scenario, and there are other issues, such as changes in the temperature difference between supply and return water, affecting terminal output, and so on. Choosing a smaller size is not good. A larger size does not matter much, and being too large is not a good thing. Generally, adding 10% to the flow rate is sufficient.
Power requirements:
The power of the water pump is generally determined based on the head and flow rate of the shaft, and then the pump proportioning motor is selected, that is, the pump proportioning motor is greater than the shaft power by one level. For example, if the shaft power is 20KW, then the 22KW motor is selected.
The greater the power of the motor, the greater the no-load space of the motor, which affects the service life of the motor and consumes excessive electrical energy. As the saying goes, a big horse pulls a small car.