BOILER FEED WATER PUMP AND MANUFACTURE THEREOF

PURPOSE:To reduce size and weight and to reduce a cost by a method wherein a casing forms integral single structure and the inner surface of a casing is covered with a film containing a plurality of components of Ni, Cr and the like. CONSTITUTION:In a boiler water feed pump, water sucked through the...

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Bibliographic Details
Main Authors OKADA RYOJI, MORINAGA TAKAYUKI, OKAWA KATSUHIDE, OKADA AKIHISA
Format Patent
LanguageEnglish
Published 15.08.1995
Edition6
Subjects
BLASTING
CHEMICAL SURFACE TREATMENT
CHEMISTRY
COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
COATING MATERIAL WITH METALLIC MATERIAL
COATING METALLIC MATERIAL
DIFFUSION TREATMENT OF METALLIC MATERIAL
HEATING
INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL
LIGHTING
MECHANICAL ENGINEERING
METALLURGY
NON-POSITIVE DISPLACEMENT PUMPS
POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS
PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
WEAPONS
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Summary:PURPOSE:To reduce size and weight and to reduce a cost by a method wherein a casing forms integral single structure and the inner surface of a casing is covered with a film containing a plurality of components of Ni, Cr and the like. CONSTITUTION:In a boiler water feed pump, water sucked through the suction port 2 of a casing 1 is boosted by an impeller 4 coupled to a main shaft 3 for mutual rotation and discharged to a diffuser 5 arranged on the outer periphery of the impeller 4. The water flows in a stage 6 arranged on the outer periphery of the diffuser 5, an out flow is changed into an in flow by means of a stage 6, and the water is guided to an impeller 4 at a next stage. In following, a boosting process is repeated to pressurize water, which is discharged through a discharge port 7. In this case, a casing form single structure and further a low cost low carbon steel is used. To improve corrosion resistance and erosion resistance of the casing, the inner side of the casing is covered with a film containing at least two components of Ni, Co, Mo, Si, B, Al, and Fe by a flame spraying method.
Bibliography:Application Number: JP19940010292