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2. Failure and Treatment of Multistage Pump Impeller and Rings The blades of the pump impeller are damaged by cavitation or inhalation of solid impurities. If the ring wear is too large to be repaired, the impeller should be replaced; if only the impeller ring With a little wear, repairs can be carried out. The method is to use the mandrel of the impeller to pierce the grooves of the flat impeller ring of the lathe, and then determine the inner diameter size of the seal ring according to the size of the van at the impeller ring. The clearance between the impeller ring and the sealing ring is determined by the inner diameter of the sealing ring, generally 0.3-0.5 mm, and the outer diameter of the sealing ring is constant.
3, multi-stage pump shaft seal device failure and treatment methods:
(1) When the pump is repaired, the packing must be replaced, and other parts should be cleaned and checked.
(2) When the bushing is worn out of the groove, it should be replaced or repaired after welding.
(3) When installing the packing ring, it must be aligned with the water seal hole so as not to be blocked by the packing and to make the water seal ineffective.
4, multi-stage pump pump shaft failure and treatment method The pump shaft is the core part of the rotor, which is equipped with impeller, sleeve, high-speed rotation in the pump body.
The pump shaft can be repaired as long as it does not cause cracks and severe surface wear or bending. The amount of bending of the shaft must not exceed 0.06mm. When it is greater than this value, it should be straightened. It is best to use a screw press without heating.
5. Axial Turbulence Accidents and Treatments of Multistage Pump Rotors The alignment of the inlet of the guide vanes and the impeller outlet of the pump is very important and affects the performance of the pump. The inspection method is to check the rotor turbulence after final assembly. The total turbulence of the 6-10 pump should be 1.0-2.0mm. If the axial turbulence is large, it is allowed to add a surface smoothness and thickness between the balance plate and the balance ring. Uniform adjustment pad adjustment.
6, multi-stage pump bearing body failure and treatment methods Generally speaking, the bearing body will not be damaged, but in case of improper fitting or poor equipment shaft hole grinding situation, the first use of boring machine to expand the bearing hole (to ensure concentricity) , Then insert the sleeve, the outer diameter of the sleeve matches the bearing hole, and the inner diameter matches the outer diameter of the bearing.
Treatment of Common Faults of Multistage Pumps
1, multi-stage pump balance device failure and treatment method Balance plate and balance ring wear too much (generally more than 2mm) or uneven, first wear the groove of the two car flat, after the balance ring to add gasket to compensate for the reduction thickness of. The gasket must be even and smooth, and should be replaced when there is excessive wear.