Small submersible pumps are important equipment for deep well water lifting. When used, the entire unit is submerged into the water. Extracting groundwater to the surface is domestic water, mine rescue, industrial cooling, farmland irrigation, seawater lifting, ship transfer, and can also be used for fountain landscapes. Hot water submersible pumps are used for hot spring bathing, and can also be used to extract groundwater from deep wells. It can also be used for water lifting projects such as rivers, reservoirs and canals. It is mainly used for irrigation of farmland and water for humans and animals in high mountainous areas. It can also be used for central air-conditioning cooling, heat pump units, cold pump units, cities, factories, railways, mines, and construction sites. The general flow rate can reach (10 cubic meters to 650 cubic meters) per hour and the lift can reach 1,500 meters. So, what are the precautions in the use of submersible pumps?
1, can not be grounded
The protection grounding of the submersible pump is a national mandatory standard. Only by taking protective grounding can you ensure personal safety during use. If there is no protective grounding, once the casing leaks, it will cause the water at the outlet of the submersible pump and the water surface of the pumping water to be charged, endangering the safety of humans and animals, and wasting a lot of electric energy. If the metal casing of the submersible pump is connected to the grounding body conforming to the national standard (the grounding resistance is not more than 4Ω), when the submersible pump casing leaks, the current flows through the metal casing of the submersible pump, the protective earthing wire, the grounding body, the earth, and the transformer. The grounding wire and the power supply form a closed loop. When the leakage current is too large, especially when the live wire hits the shell, the protection device of the submersible pump can be actuated (fuse blown or the air switch trips), and the power of the submersible pump is cut off.
2, do not install leakage protector
The submersible pump works in the water, which is easy to leak electricity and cause electric energy loss and even electric shock. If the leakage protector is installed, the leakage protector will cut off the power of the submersible pump as long as the leakage value of the submersible pump exceeds the operating current value of the leakage protector (generally not exceeding 30 mA).
3, when the power supply voltage is abnormal, boot
Excessively high and low voltages can cause the submersible pump to rise too high, shorten the service life and even burn the submersible pump. In rural areas, because the low-voltage power supply line is relatively long, the voltage at the end of the line is too low, and the voltage at the beginning is too high. Therefore, in the process of using the submersible pump, the operator must observe the power supply voltage value at any time. If it is lower than the rated voltage by 10% or less, higher than the rated voltage by more than 10%, or the current is greater than 20% of the rated current of the submersible pump, it should be immediately Stop and avoid turning the power on when the power supply voltage is abnormal.
4, the motor rotates in the opposite direction
There are many types of submersible pumps that can be vented both forward and reverse, but with a small amount of water and a large current during reversal, long motor reversal can damage the motor windings. Therefore, before entering the water, the submersible pump should be connected to the power supply to check whether the rotation direction is correct. If the three-phase submersible pump impeller is reversed, it should be stopped immediately, and the wiring of any two phases of the three-phase core wire in the cable can be exchanged.
5, long-term overload work
In order to avoid long-term overload operation of the submersible pump, do not use the low lift pump for high lift work, do not pump water with a large amount of sand (heavy mud), and observe whether the current value is within the specified range. If the current is too large, stop it and check it. In addition, the submersible pump uses water as a cooling source. Therefore, the dehydration operation of the submersible pump should not be too long.
6, frequent switching
The submersible pump should not be started too frequently. This is because the submersible pump will generate recirculation when it stops. If it is turned on immediately, the motor load will start, causing the starting current to be too large. Therefore, after the shutdown, it is necessary to wait for the return of the stored water in the pipe to start again. Generally, it needs to be separated by about 5 minutes.
7. Use in a silt environment
If the submersible pump is sunk into the mud during use, it will cause poor heat dissipation and burn the motor windings. Therefore, the submersible pump must not be used in a silt environment. In order to prevent the submersible pump from sinking into the silt, the mud in the working environment should be removed before the submersible pump is launched. If necessary, the submersible pump should be covered with a fence guard to prevent the waste from blocking the inlet fence and causing the motor to heat up. The water is not smooth.
8, long-term in the water after deactivation, regardless of whether
If the submersible pump is not used continuously after going down the well, it will rust for a long time and it will not start. Therefore, the deactivated submersible pump should not be placed in the water, regardless of whether it is asked, it should be turned on once a week for 5 to 10 minutes. When not in use for a long time, it is best not to immerse in water for a long time. It should be put in clear water for a few minutes, clean the mud inside and outside the pump, then lift the surface to dry, perform a big inspection, disassemble all parts for inspection, scrubbing and derusting. Decontamination, replace the consumables, reassemble them, paint them in rust and place them in a dry, non-corrosive gas warehouse.