1. Selection of water pump Hospital Medical Curtain,Medical Equipment,Hospital Equipment Care Home Healthcare Supplies Co., Ltd. , http://www.szmedicalmattress.com
1.1 Pump design 1.1.1 Design flow. The design flow rate should be determined according to the farmland area, irrigation amount, and number of days of irrigation, and the flow rate of the pump should be less than the continuous water supply of the water source to ensure continuous operation of the pump.
1.1.2 Design the lift. The head of the pump refers to the total head of the water system, that is, the actual head (determined by the selected pumping station address and water source conditions, which is equal to the height difference between the inlet and outlet water levels) and the loss head (equal to the actual lift). The sum of 10--0.20).
1.2 The speed of the pump. According to the design flow and the design head, the pump should be selected by the pump type spectrometer or the pump performance table (the flow and the head must match) and then checked according to the configured piping system. If the pump is not operating in the high efficiency area, it should be re-selected.
2, the use of pumps
2.1 Installation of the water pump 2.1.1 Under the conditions of the geographical environment, the water pump should be as close as possible to the water source to reduce the length of the water suction pipe. The foundation of the pump installation should be firm and the special foundation should be repaired for the fixed pump station. 2.1.2 The water inlet pipeline should be sealed and reliable, and must have special support. It should not be hung on the water pump. For the inlet pipe with the bottom valve, the axis of the bottom valve should be installed perpendicular to the horizontal plane, and the angle between the axis and the horizontal plane should not be less than 45°. When the water source is a channel, the bottom valve should be above 0.50 meters above the bottom of the water, and the net should be prevented from entering the pump. 2.1.3 The machine and pump base should be level, and the connection with the foundation should be firm. When the machine and pump belt drive, the belt is tightly pressed, so that the transmission efficiency is high, the steering of the pump impeller should be consistent with the direction indicated by the arrow; when the coupling is used for transmission, the machine and the pump must be coaxial.
2.2 Inspection 2.2.1 The rotation of the pump shaft should be flexible and there is no impact sound; the shaft diameter of the pump is not obviously shaken, and the calcium-based lubricating oil is added. 2.2.2 Check if the inlet pipe is damaged. Fix the crack in time; check whether the fastening bolts are loose and tighten the loose bolts. 2.2.3 The motor winding and electrical insulation of the submersible pump should meet the requirements before they can be used.
2.3 Operation and parking 2.3.1 When running the pump, pay attention to check the vacuum gauge and pressure gauge at any time, monitor and record the working condition of the pump, listen for abnormal noise, whether the temperature of the bearing is too high, and whether the stuffing box has dripped. More or too little, also check the pump speed and belt tension is normal. 2.3.2 The submersible pump must be buried in the water. Once it is out of the water, it should be powered off immediately to stop the operation, otherwise there is a danger of burning. 2.3.3 When the high lift pump is shut down, it should be forbidden to suddenly interrupt the power, otherwise it will easily cause water hammer and damage the water pump or pipeline; for the water delivery system with the gate valve, the gate valve should be closed slowly when stopping, and then stop; The pumping unit that is powered by the pumping machine should also gradually stop after the oil is reduced. When the machine is shut down in winter, the water in the pump should be drained to prevent rust or cracking. When the machine is shut down for a long time, the parts should be disassembled, dried, inspected and repaired, then assembled and stored in a dry place.
3. Common faults and elimination of pumps
3.1 The pump does not absorb water or water. The reason is that the bottom valve is damaged or stuck; the filtering water is blocked, the lift of the system exceeds the lift of the pump; the pump or the suction pipe is leaking; the impeller flow channel is blocked or damaged; the impeller is not in compliance with the regulation or the rotation speed is too low; Gas and so on. It can be removed by means of repair, removal of debris, fastening, replacement, etc.
3.2 The water output of the pump is small or the pumping water fails. The main reasons are pipeline leakage; the water pump speed decreases; the water level decreases, the water lift head increases; the filter screen, the impeller or the suction pipe is partially blocked; the impeller is damaged: the shaft seal leaks; the pump cover fastening bolt is loose. It can be inspected separately, blocked, and replaced or reinstalled if necessary.
3.3 The pump is vibrating or noisy. The main reasons are unreasonable installation; the pump shaft is bent; the impeller is damaged or unbalanced; the bearing is damaged or poorly lubricated; the fixing screw is loose; the shaft and the pump shaft are not concentric; the rotor of the motor is unbalanced; the impeller is rubbed with the pump casing. It can be adjusted separately. Straightening, repairing, replacing, fastening and other methods are excluded.
3.4 bearing heat. The main reasons are the bearing wear and tear; the pump shaft is bent; the lubrication is poor; the shaft and the pump shaft are not concentric; the bearing is improperly installed. Can be replaced, straightened, improved lubrication, adjustment, correct installation and other methods to eliminate.