For the maintenance of multistage high-pressure boiler feed water pump parts

multistage high-pressure boiler feed pump is often used in factories, high lift water city. Multistage high-pressure boiler feed pump parts mainly include shaft, shaft sleeve, water period, impeller, sealing ring, the middle, the water, the balancing ring, disc, tail cover. If the pump at some parts fail in use process, will affect the use, the multistage high-pressure boiler feed pump parts what to do repair work?

        ( 1) Multistage high-pressure boiler feed pump balance device

check the balance disc and balance sheet, with or without axial grinding marks and scratches, if any, should be on the lathe do slight modification on the surface of a two wear, for deep scars or eccentric wear, if dressing unavailable, another entrance in order to ensure the guide vane and the impeller outlet center aimed at sex, should the length of the tooth profile pad ( From the flat end face fix) To adjust, if there is no guarantee that, should replace the wearing parts;

check balance block set and balance disc, with or without axial grinding marks or scratches, if any, should be two on lathe do slight trim wear surface, for deep scars or eccentric wear, to reuse after finishing, the center of the entrance in order to ensure the guide vane and the impeller outlet aimed at sex, should the length of the tooth pads, ( From the flat end face fix) To adjust, if there is no guarantee that wear parts should be changed;

check balance block set and balance set, presence of radial grinding crack, if any, should also be worn surface on lathe do gently light nap, and make its radial clearance control within the scope of permissible deviation ( Less than zero. 25毫米) , if this value is in excess of that specified, should replace the two pieces.

        ( 2) Multistage high-pressure boiler feed pump pump shaft

check the shaft of the jitter tolerance ( The shaft bending) , in principle, if the shaft beating over tolerance, never allow method with hot and cold straightening, and should be replaced a new shaft.

when checking the strut between the lathe two top ( You can also use Ⅴ form from the iron support parts to beat) But note that axis on the lathe should be precise centering, otherwise it will produce error.

        ( 3) Multistage high-pressure boiler feed pump hydraulic components and interstage packing element

check middle, guide vane and the impeller sealing ring, middle ring, delivering and guide vane parts such as the sealing surface with and without cracks or grinding;

measured with dial gauge on the sealing surface circumferential at four o 'clock, check the parallelism, guide vane, middle deviation should not exceed 0. 3 mm, other deviations should not exceed 0. 01 mm, if you have any scars, seal face best finishing on lathe, if the sealing surface can have on a lathe, usable grinding tool cutting down, must not grind the interaction surface as grinding tire seal face, because it will swell the seam allowance.

check the sealing ring and guide vane radial clearance, clearance if measured values more than the allowed to achieve the most value, should replace the new components, Will guide vane and the middle point of solder joint, remove the old guide vane and the front seal ring) , check each impeller wheel shell and the neck, check for wear and tear, then finishing from the second to last level and the outline of the neck.

        ( 4) Multistage high-pressure boiler feed water pump bearings

check the bearing shell, if there is any crack, delaminating, the phenomenon such as porosity and severe wear, if necessary, use scraper scrape off a slight indentation.

under the shaft neck and the contact Angle of 60 + 5 °, and should be in the center of the tile, the contact should be uniform.

        ( 5) Multistage high-pressure boiler feed water water pump shaft seal

the damaged shaft sleeve and packing element should change new parts, such as surface have minor scratches or grooved bushing should be finishing.

        ( 6) Multistage high-pressure boiler feed water pump rotor

rotor after the repair or replacement of parts, need to test and ( Ensemble were not with 'O' type sealing ring) And then measuring guide vane impeller sealing ring diameter hole in the set of radial runout, balance disc face runout value, no more than a specified tolerance (
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