The main pump is a pump and motor, its proper selection and maintenance, irrigation and drainage costs for reducing farmland is very important. The selection of pumps in farmland river network area, low lying, drainage flood season is the main task, but also during the drought irrigation. This requires the pump flow, but also to meet the needs of irrigation and drainage. If the head of less than 5 meters, the preferred axial flow pump as well. A slightly higher plain, if the head of 5 to 10 meters, should be preferred mixed flow pump. In the hilly mountains or plateau areas, the terrain is high, requiring a larger lift pump. Generally, if the head of more than 10 meters, can be preferred centrifugal pump. If the lift is high, you should use multi-stage centrifugal pump or multi-stage pump to lift water level by level. In northern arid areas, where some areas mainly rely on pumping groundwater for irrigation, it is advisable to use a deep well pump or a well water submersible pump. In the flow of need is not too big, choose a suitable pump on it. If you need a larger flow, choose 2 to 4 sets of the same type of pump is better, it is conducive to management, use and maintenance. Power and operation (1) matching the power of power and pump rated power to match. If the matching power of the power is too large, it will result in wasted power, increasing costs; the contrary, there will be insufficient water flow or machine overload, easy to damage the mechanical parts and can not work. (2) When purchasing a new machine, wipe the protective oil on the pump and other parts first. Carefully check the impeller rotation is normal, the pump shaft rotation is flexible, the bearing clearance is appropriate to see the joint gasket gasket is damaged, the connection is solid parts, water hose leakage, leakage, and so on, if The problem should be promptly repaired. (3) The installation of pumps and power machinery should be firm and stable, so that the pump shaft and power shaft should be parallel. When installing the belt, the belt should be loose on the top, in order to facilitate the transmission efficiency. (4) When the motor drives the pump to pump water, it is forbidden to start the operation of the two pumps at the same time so as to prevent the economic loss due to the overheating of the motor due to the over-current of the whole circuit. (5) pump stop pumping, you must first close the pressure valve, and then stop, remove the belt. A longer period of downtime, the entire machine to clean up, put the water pump completely put away, the machine easy to rust parts and spare parts, to be coated with protective oil to prevent pump corrosion.
