1, the selection of pumps 1.1 pump design 1.1.1 design flow. Design flow should be based on irrigated farmland area, irrigation volume, irrigation days and so on, while the flow of the pump should be less than the continuous water supply to ensure continuous operation of the pump. 1.1.2 design lift. The head of the pump refers to the total head of the water system, which is the actual head (determined by the condition of the selected pumping station and the condition of the water source, which is equal to the height difference between the inlet and outlet of the tank) and the loss head (equal to 0 of the actual head). 10--0.20). 1.2 speed pump. According to the design flow and design lift pump selection table or pump performance table selection of the pump (flow and lift must be consistent) and then according to the configuration of the pipeline system for verification, such as pumps are not running in the high efficiency area, you should re-select. 2, the use of the pump 2.1 The installation of the pump 2.1.1 Geographical environment permitting, the pump should be as close to the water, in order to reduce the length of the suction pipe. The foundation of the pump installation should be firm, and the fixed pump station should be repaired with a special foundation. 2.1.2 inlet pipe should be sealed and reliable, there must be dedicated support, not hanging on the pump. Equipped with a valve at the end of the inlet pipe should be so that the end of the valve vertical axis and horizontal installation, the angle between the axis and the horizontal plane shall not be less than 45 °. When the water source for the channel, the bottom valve should be above the bottom 0.50 meters, and screening to prevent debris into the pump. 2.1.3 machine, pump base should be level, and the foundation should be firmly linked. Machine, pump belt drive, the belt tight side down, so that transmission efficiency, pump impeller steering should be consistent with the direction of the arrow; When the coupling drive, machine, pump must be coaxial. 2.2 Check 2.2.1 pump shaft rotation should be flexible, no impact sound; pump shaft diameter no obvious shaking, add enough calcium-based lubricant. 2.2.2 Check the inlet pipe is damaged, the cracks should be repaired in time; check the fastening bolts are loose, tighten the loose bolts. 2.2.3 submersible pump motor windings, electrical insulation should meet the requirements in order to use. 2.3 running and parking 2.3.1 pump operation should pay attention at any time check the vacuum gauge and pressure gauge, monitor and record the work of the pump to listen for any abnormal reaction, the bearing temperature is too high, the drip filling stuff More or less, but also check the pump speed and belt tension is normal. 2.3.2 Submersible pumps must be buried in the water work, once the water surface should be immediately shut down to stop running, or there is a danger of burning. 2.3.3 high-lift pump shutdown, the sudden interruption of power should be prohibited, otherwise prone to water hammer damage to the pump or pipeline; with the valve installed in the water system, shut down when the valve should be closed slowly, and then shut down; To pumping diesel-powered pump units, should also gradually shut down after reducing oil. During the shutdown in winter, the water in the pump should be drained to prevent corrosion or frost cracking. When the machine is shut down for a long time, the parts should be disassembled, dried, checked and repaired, and then assembled and stored in a dry place. 3, the common pump failure and exclusion 3.1 pump does not absorb water or no water. The reason is mostly the end of the valve damage or stuck; part of the filter blockage, the system lift more than the pump lift too much; pump or suction pipe leaks; impeller runner blockage or damage; impeller steering irregularities or speed is too low; Gas and so on. Can be taken to repair, remove debris, fastening, replacement and other methods to exclude. 3.2 pump less water or vacuum water diversion failure. The main reason for the pipeline leakage; pump speed lower; water level increase suction head lift; filter, impeller or suction pipe partial blockage; impeller damage: seal at the leak; pump cover bolts loose and so on. They can be checked separately, plugging, if necessary, can be replaced or re-installed. 3.3 pump vibration or noise. The main reason for the installation is unreasonable; pump shaft bending; impeller damage or imbalance; bearing damage or poor lubrication; loose set screws; shaft, pump shaft is not the heart; motor rotor imbalance; Can be adjusted separately. Alignment, repair, replacement, fastening and other methods excluded. 3.4 bearing fever. The main reason for the serious bearing wear; pump shaft bending; poor lubrication; shaft, pump shaft is not the heart; bearings installed properly. Can be replaced, straighten, improve lubrication, adjustment, the correct installation and other methods to exclude.
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