Regular Maintenance of Shielded Pumps In order to avoid and reduce sudden damage to the shielded pump, shielded pumps require regular service. In case of bearing monitor "alarm", must be immediately overhaul. Chemical plant is generally continuous operation, shielding pump regular maintenance only when the device is scheduled to stop. Most shield pumps can be serviced once a year. 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. (1) mechanical inspection, u-; q 'u0} & v measurement of graphite bore diameter and sleeve shaft diameter, and look at their mating surface finish. 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 size of the impeller upper and lower outer stop and their matching buckle and pump seat inner diameter of the size of the two with the gap is overhaul standards Of the range, the need to replace the parts or take other measures when overweight (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 appearance of the rotor shield sleeve, with particular attention to whether there is any abnormal weld, if necessary, should be for testing, leak detection. 'S, D, x0 A3 M After long-term operation, the balance of the 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 8 A / S # A2 X2 z, o. I DC Resistance Check: The unbalance of three-phase resistor should not exceed 2%. 4 n! H3 r: b0 G6 c 'S) S 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. Rehabilitative overhaul of shielded pump * I0 D2 d6 B i9 G. h 'o / In case of shielded pump damaged by winding or shield, recovery overhaul is required. Damage is generally divided into two types: one is the stator shield is good, and the stator winding occurs on the ground, phase breakdown, winding inter-turn short circuit, overload caused by the winding burn. The other is due to damage to the stator shield to make the medium invade the stator winding stator winding damage. In either case, replace the stator coil and shield sleeve. Since the shield pump structure is special, the stator winding replacement becomes more complicated, the stator shield and the both ends of the shield must be removed to remove the stator winding. After the winding is repaired, The new shielding sleeve and sealing plate must be reworked with special material requirements and high production precision.
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