Hard material impeller and methods and apparatus for...

Details Hard material impeller and methods and apparatus for... Hard material impeller and methods and apparatus for...

2006-01-17

2006-01-17

Nguyen, Hoang (Department: 3748)

Fluid reaction surfaces (i.e., impellers)

Rotor having flow confining or deflecting web, shroud or...

Radially extending web or end plate

C416S22300B, C029S889000, C029S889722

Reexamination Certificate

active

06986644

ABSTRACT:
Methods of producing impeller castings from very hard materials are disclosed in which the formation of a selectively configured core produces an impeller casting that does not need to be machined to receive the drive shaft and eliminates the need for employing a lead babbitt or soft insert, as is known in the prior art, to receive the drive shaft, thereby producing a hard material impeller for a centrifugal pump that is significantly less costly to produce and is environmentally safe.

REFERENCES:
patent: 2887744 (1959-05-01), Holliday
patent: 3139890 (1964-07-01), Moran
patent: 4479293 (1984-10-01), Miller et al.
patent: 4732541 (1988-03-01), Hyll
patent: 4827589 (1989-05-01), Friedrichs
patent: 5752803 (1998-05-01), Wetzel et al.
patent: 6276899 (2001-08-01), Lambert et al.

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