Agricultural submersible pump, is a rural water supply to solve the production and living of farmers as a major water lifting equipment, but due to the large number of manufacturers of submersible pumps, large differences in technical strength, resulting in poor product quality advantages and disadvantages. Therefore, in order to choose a reliable, cheap pump, it must start from the following aspects:
First, select the pump manufacturers
As a user, generally limited by the professional knowledge, can not determine which brand and what brand of pump, so when the pump is purchased, it is best to advise the pump; if the lack of people, not to ask a question Old pump users, especially with their own conditions of use similar or similar users.
Select the pump, we must first recognize the pump manufacturer, it is recommended to give priority to the purchase of water-filled submersible pump, pump the first to see the grade and product certification, must not buy "three no" products, that is, no manufacturer, No production date, no production license. Otherwise there is a problem, the user will do nothing. At the same time, should be based on local power supply situation to decide with single-phase pump or three-phase pump.
Second, determine the pump parameters
Select submersible pump focus is to determine the pump head and flow and other parameters, the user needs the best lift and pump nameplate head close to the use of the economy, efficiency can achieve the highest. However, it is not required to be absolutely equal. Generally, a deviation of no more than 20% can work under more energy-efficient conditions. If you choose the pump head is too small, low-lift pump for high-lift work, that is, "small horse drawn cart", even if pumping water, water will be small; pump head is too high, high lift pump for low lift Work, that is, "big horse car", there will be running flow is too large, the motor overload, if the long run, the motor temperature, the winding insulation will gradually aging, or even burn the motor.
Pump flow selection, water and water to the amount of water and the local economic conditions to adapt to specific problems to be treated specifically.
Third, check the quality of the pump
Submersible pump motor water filled, oil-filled and shielded structure, a water filled the most widely used. The pump before use, you must unscrew the two water holes bolt, a water injection (no sand), the other to discharge air, water and other static after waiting for about 15 minutes, and so the motor cavity air after all the discharge and then add water , Until after filling the water and then tighten the two water bolts. The motor is sealed. Motor water, the winding work in the water, the motor insulation can be measured, the measured insulation resistance must be megger that shake table, can not use a multimeter, because the multimeter range is limited, for the insulation resistance between the winding and the earth measured Not clear. Insulation qualified, the pump test run test. Wherever possible, after filling the motor with water, tighten the water injection bolt, the pump can be energized in the pool test run, but can not operate for a long time, there is no condition can idle down the well, but the time shall not exceed 2-3 seconds .
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