Various problems will inevitably occur in the daily operation of the submersible pump. To prolong its service life and ensure the normal operation of the submersible pump and related systems, the submersible pump and its control system must be fully maintained at least once a year. Today, let's take a look at some of the main factors that affect the operation of submersible pumps, the daily maintenance points of submersible pumps, and common faults and troubleshooting methods.

Care and maintenance of submersible pumps

1. Refuel frequently and change the oil regularly. Every 1000 hours of operation of the submersible electric pump, the sealing oil must be replaced, and the oil inside the motor must be replaced once a year. For the water-filled submersible pump, the upper and lower end covers, the skeleton oil seals in the bearing chamber and the lithium-based lubricating oil need to be replaced regularly to ensure a good lubrication state. For small submersible electric pumps with mechanical seals, the oiling screw holes of the sealing chamber must be opened frequently to fill up lubricating oil, so that the mechanical seals are in a good lubricating state and their working life is fully guaranteed.

1. Replace the sealing box in time. If it is found that there is a lot of water leaking into the electric pump (the normal leakage is 0.1mL/h), the sealing box should be replaced in time, and the insulation resistance value of the motor winding should be measured at the same time. If the insulation resistance value is lower than 0.5 megohm, it needs to be dried, and the method is the same as that of the general motor winding. When replacing the sealing box, pay attention to the outer diameter and the integrity of the O-ring in the shaft hole, otherwise, the water will leak into the submersible pump in large quantities and damage the motor winding.

1. Always measure the insulation resistance value. Use a 500V or 1000V megger to measure the insulation resistance value of the stator winding of the electric pump to the casing. Only those with a value of more than 1 megohm (minimum should not be less than 0.5 megohm) can be used. Otherwise, the winding should be repaired or dried to ensure that Use safety.

1. Reasonable custody. When not in use for a long time, the submersible sewage pump should not be immersed in water for a long time, and should be stored in a dry and ventilated room. When storing the rubber cable of the submersible pump, avoid sunlight exposure, otherwise, it will be easy to age, and the surface will have cracks. Serious consequences such as short circuits or zero insulation resistance of winding to ground.

1. Carry out anti-rust treatment on the surface of the submersible pump in time. After one year of use, the submersible pump should be painted and rust-proof in time according to the corrosion of the surface of the submersible pump. The internal paint to prevent rust depends on the pump type and corrosion conditions. Under normal circumstances, when the interior is full of oil, it will not rust, and the interior does not need to be painted at this time.

1. The submersible pump should be maintained once a year (or a total of 2500 hours of operation), including: disassembling the motor of the pump, cleaning all parts, removing scale and rust, checking its integrity, and repairing or replacing damaged parts in time; Replace the lubricating oil in the sealing chamber and the motor; if the lubricating oil released in the sealing chamber is turbid and the water content exceeds 50mL, the integral sealing box or the dynamic and static sealing rings need to be replaced.

1. Air pressure test. After the overhauled electric pump or the replacement of the mechanical seal, the air pressure test of 0.2MPa should be used to check whether there is air leakage between the O-ring and the two covers of the mechanical seal at the fitting surface of each part. Assemble or replace leaking parts.

Conclusion

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