Agricultural Submersible Pump Selection

The agricultural submersible electric pump is an important water lifting device for producing and domestic water for farmers, but due to the large number of manufacturers of submersible electric pumps, there is a large gap in technical strength, which results in great disparities in product quality. Therefore, if you want to choose a reliable, inexpensive pump, you should consider from the following aspects:

One is to choose a pump manufacturer. General users are limited by their professional knowledge and cannot determine which and which brand of water pump to use. Therefore, when purchasing a pump, it is advisable to consult the experts on the pump. If there is a shortage of people in this area, don't hesitate to ask a pump user, especially a user with similar or similar conditions of use. When selecting a pump, you must first look at the brand and product certification, and you must not purchase "three no" products, that is, no manufacturer, no production date, no production license. Otherwise, the user will be at a loss.

The second is to determine the pump parameters. The main point of choosing a submersible electric pump is to determine the parameters such as head and flow of the pump. The best head for the user needs to be close to the head of the pump nameplate. It can be used economically to achieve the highest efficiency. However, it is not required to be absolutely equal. Generally, a deviation of less than 20% can work under more energy-saving conditions. If the pump head selected is too small, the low lift pump is used for high lift operation, ie “small horse-drawn cart”. Even if it can pump water, the water volume will be very small; the pump head is too high, and the high lift pump is used for low lift. Work, that is, "big horse-drawn car", there will be excessive flow during operation, motor overload, if the long-term operation, the motor temperature increases, the winding insulation will gradually aging, or even burned the motor. The choice of pump flow rate should be consistent with the amount of water coming from the water source and the amount of water used.

The third is to check the quality of the pump. Submersible pumps are available in water-filled, oil-filled, and shielded configurations. The most widely used is a water-filled application. Before using this pump, you must unscrew all 2 water injection holes, one water injection (no sand water), and the other discharges air. After the water injection, it needs to wait for about 15 minutes. After the air in the motor chamber is fully discharged, add water. Until the water is filled, then tighten the two water injection bolts so that the motor is in a sealed state. After the motor is filled with water, the windings work in water and the insulation of the motor can be measured. The megohmmeter must be used to measure the insulation resistance, and the universal meter cannot be used. Because the range of the universal meter is limited, the insulation resistance between the winding and the earth is measured. Not sure. After the insulation is qualified, test the pump. Where conditions permit, after the water is filled in the motor, tighten the water injection bolts, and the pump can be energized and tested in the pool, but it cannot be operated for a long time.

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