Shielding pump repair method is: Disassemble the shield pump: first clean up the parts, and then make an apparent inspection of them, whether there is any exception. Then measure the size of the key parts, electrical inspection of the motor windings. Shield Pump Mechanical Inspection (1) Mechanical Inspection Measure the bore diameter of graphite bearings and the shaft diameter of bushings and check the finish of their mating surfaces. Such as graphite bearings and bushings with clearance over the provisions of maintenance standards (0.55-11kw with the gap, the diameter difference of 0.4 mm, 15-45kw with the gap, the diameter difference of 0.5 mm) or with poor surface finish, the need to be replaced according to circumstances Bearings, bushings or thrust plates. Measure the dimensions of the upper and lower outer stops of the impeller and their matching buckle and pump seat inner diameter, whether these two clearances are within the scope of the overhaul standard, replace parts or take other measures when out of tolerance Such as: surfacing, set) to meet the requirements of the gap. Otherwise it will affect the pump performance, flow, lift, axial balance and so on. Observe the inspection set, the apparent state of the rotor shield sleeve, with particular attention to whether there is any abnormal weld, if necessary, should be for testing, leak check. After long-term operation, the balance of rotating parts may change. Therefore, it is necessary to rotate the rotor together with the impeller and other rotating parts assembled to do dynamic balancing test. (2) Electrical Check DC Resistance Check: Three-phase resistance unbalance shall not exceed 2%. Insulation resistance check: shielding pump motor winding insulation resistance can generally reach more than 100MΩ. Such as less than 5MΩ need to analyze the reasons for insulation is damp, or shielding the leak if there is no problem, such as leakage through the stator shield no problem, then purely moisture insulation, the need for drying treatment, such as stator shield has a problem, You need to change the shielding sleeve. Shield pump mechanical inspection
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