The selection of deep well submersible pumps before use is very important. The pump model should be selected according to the actual conditions of the water source, working hours and pump water volume. First, the head should be selected to be larger than the drop between the water intake and the water inlet; secondly, the flow of the pump should be able to meet the requirements of drainage and irrigation.
(1) Environmental requirements for deep well submersible pumps
1. There is a safe and reliable power supply.
2. The drop between the outlet pipe and the water surface of the pool should be less than the head 3. Choose a relatively clean water source.
(2) Deep well submersible pump started
1. Submersible pumps below 11 kilowatts are allowed to start directly. Submersible pumps above 13 kilowatts should be equipped with a depressurization starting cabinet. To protect the safe operation of the submersible pump.
2. In order to prevent the rotor of the deep well submersible pump from moving up instantly and reducing the starting load. When the submersible pump is started, the outlet valve stroke should be closed to 3/4. (Leave 1/4 air gap. In order to deflate) After starting the water outlet, slowly open. The working point of the water pump is controlled at an appropriate position.
3. After the start-up is completed and the operation starts. Should strengthen monitoring and observation of water level changes. Ensure that the submersible pump runs within the working conditions. After the submersible pump is running smoothly, it can be put into formal operation
4, 5 hours after the submersible pump is put into operation. Stop the machine and measure the thermal insulation resistance quickly. Its value is not less than 0.5MΩ. To continue using
(3) Deep well submersible pump operation
1. The submersible pump should work at the design operating point. At this time, the axial force is moderate.
2, the submersible pump must be fully inspected every 8 hours of operation. Whether each instrument has changed. Whether the circuit node is hot. Is the sound normal? Whether the normal working current is greater than the rated value of the motor's nameplate, please stop the pump immediately if one of the following situations occurs
1) The working current of the pump is suddenly higher than the rated current of the motor.
2) Abnormal water output, intermittent water output. Increase in sand content.
3) The insulation resistance of the motor is less than 0.5 megohm.
4) The unit has obvious noise and vibration aggravated.
5) The grid voltage is insufficient. Less than 5% of rated voltage
6) One phase of the fuse is burned out.
7) Damaged water pipeline
