Composite polyurethane mixing impeller

Details Composite polyurethane mixing impeller Composite polyurethane mixing impeller

1991-01-17

1993-04-13

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Tined or irregular periphery

416229R, 416236R, 416240, 416241A, 366316, F04D 2926

Patent

active

052016358

ABSTRACT:
A polyurethane impeller for mixing liquids lasts considerably longer than equivalent metal impellers of the prior art. The impeller comprises a disk having inner and outer portions of polyurethane resin having different flexibilities, the outer portion being bonded to the inner portion and having greater flexibility than the inner portion. The polyurethane portions are chemically reacted with each other to form a strong chemical bond.
A method is provided for centrifugally casting a polyurethane impeller having inner and outer sections of different flexibility and hardness.

REFERENCES:
patent: 2270480 (1942-01-01), Seyfried
patent: 3322401 (1967-05-01), Mersch
patent: 3630373 (1971-12-01), Grazen
patent: 3751181 (1973-08-01), Hayashi
patent: 4171166 (1979-10-01), Trowbridge et al.
patent: 4499445 (1985-02-01), Mitchell

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