Small submersible pump for agriculture is one of the main water-lifting equipment in rural areas to solve the problems of farmers' production and domestic use of water for irrigation and farmland irrigation. However, due to the large number of submersible pump manufacturers and large technical forces, the quality of products is very poor. Therefore, in order to choose a reliable, cheap pump, it must start from the following aspects:
1, the manufacturer's choice
Select the submersible pump, we must first recognize the pump manufacturer, it is recommended to give priority to buy water-filled submersible pump, pump the first to see the grade and product certification, must not buy "three no" products, that is, without the manufacturer , No production date, no production license. Otherwise there is a problem, the user will do nothing.
2, single-phase pump or three-phase pump selection
Should be based on local power supply situation to decide with single-phase pump or three-phase pump, where there is a three-phase power supply generally choose three-phase pump. This is because the same size single-phase pump and three-phase pump compared to three-phase pump small size, light weight, light vibration, so the choice of three-phase pump more economical.
3, the pump parameters to determine
Select submersible pump focus is to determine the pump flow and head and other parameters. Pump flow selection, water and water to the water and water consumption and family conditions to adapt to the specific issues to be treated specifically. Users need to lift the best choice for the pump head lift close to the use of economic, 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.
4, pump quality inspection
Submersible pump motor water-filled, oil-filled and shielded structure, the general water-filled applications are the most widely used. The pump before use, you must unscrew the two water injection holes bolt, a water injection (no sand), the other to discharge air, water after the static wait for about 15 minutes, and so on all the motor cavity air after the discharge plus clear 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 conditions permit, after the motor is filled 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, no conditions can be idle in the well, but the time shall not exceed 3 seconds.
5, the choice of purchase location
Should pay attention to the agricultural machinery department approved point of sale or store to buy and request a formal invoice, otherwise there is a problem, the user will not be able to solve.