Eight major precautions in the application of deep well submersible pumps

Submersible pumps are the main equipment for deep well water lifting. When used, the entire unit is submerged into the water. The groundwater is taken to the surface, which is water for day use, mine rescue, industrial cooling, farmland irrigation, seawater submersible pump improvement, ship transfer, and can also be used for fountain sights. Hot water submersible pumps are used for hot spring bathing, and can also be used from deep wells. Get groundwater, but also for water 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 self-priming pump units, cities, factories, railways, mines, and construction sites. Usually the flow 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

Submersible pumps adopt maintenance grounding as a request for the national strong pipeline centrifugal pump system standard. Only adopt maintenance grounding to ensure personal safety during operation. If there is no maintenance grounding, once the casing leaks, it will constitute the water at the outlet of the submersible pump and the water surface of the pumping water will be charged, endangering the safety of humans and animals, and ruining a large amount of electric energy. If the metal casing of the submersible pump is grounded 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 maintenance grounding 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 front is in contact with the casing, the maintenance device of the submersible pump can be actuated (the fuse is blown or the air switch is tripped), and the power of the submersible pump is blocked.

2. no device leakage maintenance device

The submersible pump operates in the water, and it is easy to leak electricity to cause loss of electric energy and even cause electric shock. If a leakage maintenance device is installed, only the leakage current value of the submersible pump exceeds the operating current value of the leakage maintenance device (usually not exceeding 30 mA), and the leakage maintenance device blocks the power supply of the submersible pump.

3. the power supply voltage is abnormal when booting

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, it is necessary for the operator to investigate the power supply voltage value at any time. If it is less than 10% below the additional voltage, more than 10% higher than the additional voltage, or the current is greater than 20% of the additional current of the submersible pump, That is, stop the machine and prevent the power supply from turning on abnormally.

4. the motor rotates in the opposite direction

Nowadays, there are many types of submersible pumps that can circulate water in both forward and reverse directions. However, when the water is turned, the amount of water is small and the current is large. If the turning time is long, the motor windings will be damaged. Therefore, before the submersible pump enters the water, it should be connected to the power supply to check whether the rotation direction is accurate. If the three-phase submersible pump impeller is reversed, it should stop immediately, and the wiring of any two phases of the three-phase core wire in the cable can be interchanged.

5. long time overload operation

In order to prevent the submersible pump from overloading for a long time, do not use the low lift pump for high lift operation, do not pump water with a large amount of sand (heavy mud), and check whether the current value is within the scope of the rule. If the current is too large, stop it and check it. In addition, the submersible pump uses water as a cooling source, so the dehydration operation of the submersible pump should not be too long.

6. frequency switch

The submersible pump should not be launched too frequently. This is because the submersible pump will recirculate 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 tube to start again, usually at intervals of 5 minutes.

7. Use in silt environment

If the submersible pump is sunk into the mud during operation, 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 by the gate guard to prevent the waste from blocking the inlet gate. The motor is hot and the water is not smooth.

8. after the long-term stop, put in the water, regardless of whether

The submersible pump is not used after the following wells, and it will rust when it is long, so it cannot be started. 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 it is not used for a long time, the best time is not soaked in water. It should be placed in clean water for a few minutes, clean the mud in the pump table, then lift the surface to dry, perform a large inspection, disassemble all parts for repair, wipe, Derusting and descaling, replace the consumable parts, and then reassemble them. After the paint is rust-proof, it is placed in a warehouse with dry and non-corrosive gas.