Agricultural submersible pump, is an important water supply equipment for production and domestic use of farms, but due to the large number of submersible pump manufacturers, technical power gap is large, resulting in poor product quality. Therefore, in order to choose a reliable, cheap pump, should consider the following aspects: First, select the pump manufacturers. General users subject to the limitations of professional knowledge, can not determine which brand and what brand of pump, so when the pump is purchased, it is best to experts in the pump advice. If the lack of people in this area, not to ask the old pump users, especially with their own conditions of use similar or similar users. Select the pump first to see the grades 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. The second is to 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 be used to adapt to water and water. Third, check the pump quality. 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 discharge plus 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 bolts, the pump can be energized in the pool test run, but not for a long time.
