Agricultural submersible pump is widely used in rural areas of irrigation and drainage water treatment and industrial and mining sites for water supply and drainage. We have done market survey submersible pump of the actual application: which found a lot of agricultural submersible pumps due to the selection and installation is not appropriate, making the pump can not play its due role, the pump motor life shortened, and some even burned motor And personal injury accidents.
Many types of Agricultural submersible pump, must be based on the actual situation appropriate choice. According to our experience, can be considered from the following three aspects:
First, the choice of the main parameters of Agricultural submersible pump
(1) Head: refers to the pump pumping unit weight of liquid from the pump inlet to pump the value of the energy of the water, that is pumping the liquid column height of liquid. In H, the unit is m. It should be noted that when the submersible pump is used to raise the well water, the value of HD is determined according to the lowest point where the water level in the well may drop. In addition, the pipe length, elbow and pipe wall are rough and the water pressure is reduced. So that the head loss HL increases. In our experience, the value of HL is usually 10% of the length of the pipeline to consider. According to the above formula to determine the head H2N, we propose to increase the head margin of 5%, in order to avoid the actual use of inadequate head. But do not add too much waste.
(2) flow: refers to the pump in a unit of time pumping out the amount of liquid. Expressed in Q, in m³ / h. The choice of submersible pump flow should pay attention to two points: First, the well water running submersible pump, the flow should be less than or equal to the amount of water in the well. Otherwise it will drain the water in the wells, causing the motor burned; Second, the actual work of the submersible pump flow to be 0.7 to 1.2 times the rated flow between the pump. Because the efficiency of the pump in this flow range is high.
Second, the choice of the structure of Agricultural submersible pump
(1) According to the structure of the pump motor type, dry, oil-immersed, water-filled and shielded. Dry-type motors like ordinary closed-type motor, the stator and rotor in the air; oil-filled motor filled with oil; filled motor filled with water; shielded motor set, the rotor is separated, the stator part is dry , The rotor part of the oil-filled or water-filled.
Dry-type motor sealing performance is relatively poor, but the price is cheap; oil-filled motor and water-filled motor can improve the sealing conditions, so that outside water is not easy to enter the motor interior, wide application; shielded motor sealing performance and insulation Performance is better, the price is more expensive.
(2) according to the structure of the pump itself to points, axial flow, centrifugal and mixed flow, etc., each for different occasions. Axial flow pump for low head, large flow; centrifugal pump for high-head, small flow; Francis pump is suitable for head and flow are relatively modest.
We just follow the above two aspects, combined with the actual application of the specific circumstances, we can on the structure of the submersible pump to make the appropriate choice.
Third, the choice of Agricultural submersible pump water piping
A variety of submersible pumps have a certain requirements on the outlet pipe, ID size does not match the length or length will affect the flow, reduce efficiency and waste of electricity. But also the consumption of pump head, less than the use of submersible pump requirements. So be sure to pump in accordance with the requirements of the inner diameter of the outlet pipe matching the water pipe, the length to reach the height of the minimum height of the length of the principle to determine. As a result of shortage of water supply and other issues need to replace, the substitute pipe water flow rate should be controlled in the general 4m / s or less.
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