First, the submersible pump maintenance 　　 1. Electrical 　　 (1) often check the submersible pump operating voltage and current. Use the voltmeter to measure the three-phase voltage should be basically the same, and in the 340 ~ 420V, with a clamp ammeter to measure the three-phase current should be basically the same, and is 0.5 to 1 times the rated current. 　　 (2) Regularly check the submersible pump on the ground of the thermal insulation resistance. In normal continuous operation after 4 ~ 6h, stop using megger to measure the motor winding insulation resistance should be> 0.5MΩ. Submersible pump for a long time to disable, should also be used before such a check. 　　 (3) Check the sensitivity of the thermal relay and the work of other protective devices before starting the machine. 　　 (4) Check the cable for damage. For the oil-immersed submersible pump, we should pay attention to the damaging effect of electric pump oil on the cable insulation rubber. 　　 2. Mechanical aspects 　　 (1) often check the submersible pump mechanical seal situation. Open the hole screw, release a small amount of oil, such as oil contains moisture, then the grinding block (or under the grinding block) seal has leaked, the seal box should be replaced and add a new cooling oil. If there is a lack of oil or bad oil in the oil hole, fill it with oil (No. 5 or No. 10 mechanical oil, sewing oil or transformer oil) or replace with new oil. 　　 (2) for new or replaced grinding block submersible pump, the use of 50h should open the water sealing plug, check the oil (water) leakage, <5ml Description sealed properly, you can continue to use such as> 5ml, the oil ( Water) and then tighten the sealing stopper, continue to use after 50h for the second inspection, if still> 5m1, then there is a problem sealing. For the use of submersible pump, to check once a month the amount of leakage should be <25ml, dry can continue to use. 　　 (3) Check the pump motor vibration Synchronous speed n0 = 3000r / min, 1500r / min, 1000r / min, 750r / min of the motor, the required vibration values ​​corresponding to δ ≤ 0.06mm, 0.1mm, 0.13mm, 0.16 mm. 　　 (4) Regular inspection of submersible pump bearings. To see if the bearings are short of oil, whether to run the inner ring or run the outer ring, the bearings should be replaced (for the water-filled electric pump bearings is best to be replaced once a year). 　　 3. other aspects 　　 (1) often check the submersible pump inlet nets whether weeds dirt clogging, whether the impeller is wound. 　　 (2) submersible pump not used for a long time, should be raised, cleaned and dried, placed on dry and ventilated indoor storage. 　　 (3) 1 to 2 years after the submersible pump is running, the motor should be subjected to core-pulling inspection and cleaning. If there is dirt, the motor can be immersed in 0.2% of the Haitian TX-10 or 105 detergent solution, heated to about 100 ℃ and stirring solution to speed up the dissolution of dirt, 1 ~ 2h dirt to eliminate, then rinse with high-pressure tap water A net water, placed in the oven can be dried at low temperature. Submersible pump maintenance and routine maintenance 　　 Second, submersible pump maintenance 　　 1. Submersible pump common faults, causes analysis and processing 　　 2. Rewinding of motor stator windings 　　 (1) In order to avoid or reduce the assembly error, the rotator is not flexible. Before the motor is disassembled, put a mark on the joint between the front and the back end with the machine base, and assemble as it is after repair. 　　 (2) demolition of the group, we should focus on protecting the iron core, to avoid the silicon steel tilt, shift, slot tooth angle burr and so on. The better stitching method is: first use diagonal pliers to cut the coil from one end, then use pliers to pull out the other end. 　　 (3) Winding the coil according to the required size to make the coil, in order to ensure that the winding end gap and the coil into the groove. 　　 (4) The rule of using the "three plane method", that is embedded in a phase and then embedded in another phase, so that the end of the formation of "three-plane": Embedded should pay attention to: ①the first two "hanging" coil The position should be appropriate to ensure that the other coil is not rub scratch stator core; ② less coil under the coil to avoid damage to the coil insulation; ③ interphase insulating paper to be inserted in place, the two-phase coil to be strictly separated; ④ for the oil Immersion and water-filled motors, the coil (including the end) can not be compacted, so that oil (water) can flow as the winding heat. 　　 (5) handle the connector insulation. Stripping the joints at the jacket and insulation layer, clear the copper surface paint and oxide layer; and then twisted for soldering, and remove sharp corners, burrs and residual solder; then polyethylene tape half-stack of 2 layers , With a stretch about 2 times the butyl self-adhesive tape half-stack of 6 layers (tight joints without gaps), and finally with polyethylene tape or polyester tape semi-stacked two layers as a mechanical protection. 　　 (6) Keep it clean during assembly. Carefully adjust the bottom of the "limit screw" so that the rotor can rotate freely, and tighten the lock nut. Press the original position of the cover, pay attention not to damage the seal box hole rubber seal ring. Integral sealed box assembly can only be gently pushed into, you can not knock. 　　 3. Assembled motor test 　　 (1) pressure test. Use 2kg / mm2 pressure to check each part of the mouth with the Department of O-shaped rubber seal ring and seal the two sealed box within a leak, air leaks in the upper and lower lid plus mechanical oil. 　　 (2) DC resistance. The stator winding resistance per phase shall be within ± 2% of the average of the three-phase winding resistance. 　　 (3) Insulation resistance. At room temperature should be> 5MΩ. 　　 (4) mechanical inspection. Pump operation, the sound of all components should be normal. 　　 (5) no-load test. No-load current under rated voltage and no-load loss and the original motor is not much difference. Commonly used 2.2kW submersible pump, no-load current 1.8 ~ 2.5A, no-load loss <0.5kW. 　　 (6) load test. After running in water for 4h, the temperature rise of the motor is ≤75 ℃. 　　 (7) Braking test. Connect the impeller to the 100V AC power supply. The current value of each phase should be within ± 10% of the average of the three-phase current. Submersible pump maintenance and routine maintenance