Shenyang Submersible Pump Protection

Nov 25, 2022

1. Electrical above

(1) Always review the operating voltage and direct current of the submersible pump. The three-phase voltage measured by the water pressure meter should be basically uniform, and at 340~420V, the three-phase direct current measured by the clamp-type direct current meter should be basically uniform, and it should be 0.5~1 times the extra direct current.

(2) Regularly review the thermal insulation resistance of the submersible pump to the ground. After the abnormality runs for 4~6h successively, stop and measure the insulation resistance of the motor winding to ground with a megohmmeter, which should be > 0.5MΩ. For submersible pumps that have been stopped for a short period of time, such a review should also be made before use.

(3) Before starting the machine, check the sensitivity of the thermal repeater and whether the operation of other protective installations is abnormal.

(4) Check whether the cable is damaged or not. For oil-immersed submersible pumps, pay attention to the damaging effect of oil seepage of the electric pump on the cable insulating rubber.

2. mechanically

(1) Always review the mechanical seal condition of the submersible pump. Open the oil hole screw and release a large amount of oil. If the oil contains moisture, it is indicated that the upper grinding block (or the lower grinding block) is sealed with water seepage. The sealing box should be replaced and the new freezing oil should be removed. If the oil hole is short of oil or the oil quality is not good, it should be filled with oil (No. 5 or No. 10 mechanical oil, sewing oil or transformer oil) or replaced with new oil.

(2) For the new or replaced submersible pump, the water sealing plug should be turned off after 50 hours of use, and the amount of oil (water) leaked should be checked. If it is less than 5ml, the seal is abnormal. If it can be used continuously, if it is more than 5ml, the oil (Water) After draining, tighten the sealing plug, and make a second inspection after 50 hours of continuous use. If it is still >5m1, it indicates that there is a problem with the sealing. For the used submersible pump, the amount of leakage should be checked once a month, and it should be less than 25ml, which can be used continuously after drying.

(3) Check the vibration state of the pump motor. The synchronous speed is n0=3000r/min, 1500r/min, 1000r/min, 750r/min, and the vibration value is corresponding to δ≤0.06mm, 0.1mm, 0.13mm, 0.16 mm.

(4) Regularly review the bearing condition of the submersible pump. Check whether the bearing is short of oil, whether it is running on the inner ring or the outer ring, and whether the bearing needs to be replaced (the bearing of the water-filled electric pump is replaced once a year).

3. rest above

(1) Always check whether the inlet mesh cover of the submersible pump is blocked by weeds and dirt, and whether the impeller is entangled.

(2) Submersible pumps that are not necessary for a short period of time should be raised to the port surface, washed and dried, and stored upright in a dry and ventilated room.

(3) After the QJ series submersible electric pump has been running for 1 to 2 years, the motor should continue to be checked and cleaned by core pulling. If there is contamination, immerse the motor in 0.2% Haiou TX-10 or 105 soap powder solution, heat it to about 100°C and stir the liquid to slow down the contamination melting. After 1~2 hours of contamination, use low-pressure tap water to develop Pickled Zangjia to clean the water droplets, put it in the oven to dry at high temperature.