How to Overhaul Shielding Pump Shielding Pump

As the service life of the increase, the use of the number increased, the damage is also increasing, the number of recovery overhaul increased year by year. Shielded pump is composed of centrifugal pump and three-phase asynchronous shielded motor coaxially, without mechanical seal without leakage, suitable for conveying all kinds of toxic, harmful and valuable liquid, widely used in chemical, pharmaceutical, nuclear industry, aerospace and other devices application. How to Overhaul Shielded Pump Shield Pump Interpretation In the shielded pump motor loss, the stator shield sleeve loss is large, sometimes up to 2 to 3 times the iron loss, after repair shield sleeve loss should be maintained at its original level. Loss of stator shield PB is proportional to the shield thickness, inversely proportional to the resistivity of the shield material ρ. Shield material must have good mechanical properties and corrosion resistance of non-magnetic materials, in order to reduce the eddy current loss to use a large resistivity material. Thickness should not be too thin, to affect the mechanical strength, it should not be too thick, thick shield will increase the loss. Many imported shielding pump, there are general maintenance, but also recovery overhaul. With the increase of the service life, the increase in the number of use, the damage is also increasing, the number of recovery overhaul increased year by year. Power from 0.55 kilowatts to 130 kilowatts. Many imported shielding pump, there are general maintenance, but also recovery overhaul. 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 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 stop openings of the impeller and the inner diameter of the buckle and pump seat matching them and whether these two clearances are within the overhaul of the standards and when parts are out of tolerance or where other measures are required : 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. Shield pump to regular maintenance, in order to ensure reliable operation. (Editor: Huang Nengwen QQ:)

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