Centrifugal pump formed by pressing and welding and its manufacturing process
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United States of America Patent
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Jun 25, 2002
Grant Date -
N/A
app pub date -
Aug 25, 2000
filing date -
Oct 30, 1998
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Abstract
The invention relates to a centrifugal pump and it's manufacturing process, more particularly to a pump formed by pressing and welding metal sheet. In this invention, comprising a pump casing, an impeller, labyrinth ring supports, labyrinth rings, a real cover and a chassis, characterized in that the manufacturing process of said pump casing includes following steps: using a female mold made by wear-resisting metal, the female space in said female mold is a near 360.degree. integrated spiral with radial expanded gradually shape and approximately semicircle cross section, using a male mold made by pressing deformable soft or elastic material, putting a tubular member with flange made by metal sheet between said molds, closing said molds, expanding said male mold made by soft or elastic material. Said tubular member will be expanded into a near 360.degree. integrated spiral casing with radial expanded gradually shape and approximately semicircle cross section.
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