Maintenance of DG - type boiler feed water pump

Boiler Feed Pump Overview:
        Boiler feed pump suitable for conveying temperature below 110 ° C of water or physical and chemical properties similar to the water non-corrosive to other liquids, widely used in industrial and mining enterprises and institutions of the boiler water supply and urban life water supply. DG series pumps are particularly suitable for boiler feed water.
Boiler feed pump maintenance reasons:
        Vibration value is too large, more than 0.2mm;
      Boiler feed pump repair content:
        1) to find the coupling, adjust the axial clearance of the coupling;
        2) check, repair in the operation of the various defects, adjust the bearing gap, tighten the various parts of the bolt;
        3) check and clean the cooling water system;
        4) disintegration, check the parts of the wear and tear, corrosion and erosion degree, be overhauled or replaced;
        5) check the shaft wear, corrosion and not straight, to repair or replace;
        6) correction shaft, impeller dynamic balance;
Boiler Feedwater Pump Structure Description:
        Boiler feed pump for horizontal multi-stage pump, both ends of the support. The housing part is the segment type, the pump transmission way is through the elastic diaphragm coupling and the electric machinery connection. The direction of rotation of the pump from the drive side to see the pump, clockwise rotation.
        1, the stator part:
        Mainly in the suction section, the middle, spit out the section, guide vane, and so on, respectively, with tightening bolts into one, spit mouth and suction port for the vertical direction.
        2, the rotor part:
        Mainly shaft, impeller, balance plate and sleeve components and other components.
        3, the pump seal:
        Single-ended mechanical seal
        A, the suction section, the middle section, between the discharge section of the static joint with a rubber seal sealed.
        B, the use of retaining retaining water, to prevent water into the bearing.
        4, the bearing part:
        The entire rotor is supported by a sliding bearing at both ends of the shaft. The bearings are automatically lubricated with petrol stations.
Boiler feed pump maintenance procedures
        1, the demolition of the boiler feed pump
        1) split the coupling cover, coupling bolts, demolition of cooling water pipes, pump air valve;
        2) Remove the pump cover bolts, packing gland bolts, remove the packing gland, smooth lift the pump cover on the designated location;
        3) Remove both sides of the bearing cap bolts and non-drive side end caps, remove the bearing cover, hang the rotor;
        2, boiler feed pump rotor disassembly
        1) Remove the coupling with a special tool;
        2) Remove the rolling bearing and the bearing with copper rods gently knocked out;
        3) Loosen the sleeve and cap on both sides, remove the sleeve and remove the components such as the flange and the packing seat seal ring. Such as impeller corrosion or serious ring wear, the use of heating methods, with a special tool to remove the impeller;
        3, boiler feed pump inspection and repair
        1) Turn the pump cover to clean up the check surface without blown, burr;
        2) Clean the pump shaft and place the axis on the dedicated "V" type iron upper school bend;
        3) check the impeller cavitation and repair, clean up the impeller runner, remove the rust;
        4) clean check the sleeve;
        5) clean check seal ring;
        6) check clean bearing whether the wear and tear, rotation is flexible, with or without noise;
        7) bearing room with kerosene clean, oil cup clearly visible oil level;
        8) Put the impeller, the sleeve into the shaft, and then tighten the ends and cap on the special "V" iron or on the bearing school Colonel;
        9) clean check the coupling, wheel bolts and elastic ring without damage;
        10) clean check the pump body, combined with the surface with a radiant cloth polished clean;check details of submersible tube well pumps
      Boiler feed pump disassembly should pay attention to:
        1) in the demolition of the pump shaft when the components such as hand hammering must use copper rods, can not hurt the pump shaft;
        2) Remove the components must be placed in order in order, and do the number in order to buy back;
        3) the input end fastening nut is anti-silk;