How to check and repair shield pump
First, the electrical inspection:
1, DC resistance check: Three-phase resistance imbalance shall not exceed 2%.
2, insulation resistance check: Insulation resistance of stainless steel shield pump motor windings can generally reach more than 100mω. Such as less than 5mω need to analyze the reasons for insulation is damp, or shielding sleeve leaks, etc., such as the stator shield leaks no problem, then purely moisture insulation, the need for drying treatment, such as stator shielding sets of problems, You need to change the shielding sleeve.
Second, the mechanical inspection:
1, measuring the diameter of graphite bearings and shaft sleeve diameter, and look at their mating surface finish. Such as graphite bearings and bushings with clearance over the provisions of the maintenance standards (0.55-11kw with the gap, the diameter difference of 0.4 ?, 15-45kw with the gap, the diameter difference of 0.5?) Or with poor surface finish, the need to be replaced according to circumstances Bearings, bushings or thrust plates.
2, measuring the impeller's upper and lower outer stop and their matching buckle and the size of the inner diameter of the pump seat, the two with the clearance is within the scope of the overhaul standards, the need to replace the excess or take other parts Measures (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.
3, 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 testing, leak check.
4, after long-term operation, the rotation part of the balance may change. Therefore, it is necessary to rotate the rotor together with the impeller and other rotating parts assembled to do dynamic balancing test.
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