Document Type and Number:
Japanese Patent JPH0235879
Kind Code:
B2
Abstract:
A pump impeller comprises a hub surrounded by a web which is a surface of revolution about, and whose imaginary projection intersects, the hub axis, the web carrying helico- centrifugal vanes with both faces of each vane parallel and formed as acute helicoids about the hub axis. The impeller is made by constructing a plastic pattern having vanes 12, using the pattern to form a sand mould, withdrawing the pattern from the sand with a helical movement and then filling the mould cavities with liquid metal.
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Inventors:
JOERU SHADENYUU
MITSUSHERU DEGEI
MITSUSHERU DEGEI
Application Number:
JP3819782A
Publication Date:
August 14, 1990
Filing Date:
March 12, 1982
Export Citation:
Assignee:
GUINARD POMPES
International Classes:
F04D29/24; B22C9/10; B22C9/22; B22D25/02; B29C41/00; B29C45/00; B29C45/26; B29C45/37; B29C45/44; F04D29/22; B29L31/08
Next Patent: JPH0235880