Centrifugal pump with means for preventing impeller from unscrew

Details Centrifugal pump with means for preventing impeller from unscrew Centrifugal pump with means for preventing impeller from unscrew

1996-05-15

1998-10-20

Kwon, John T.

Fluid reaction surfaces (i.e., impellers)

Specific working member mount

Turbo machine

403299, F04D 2934

Patent

active

058237445

ABSTRACT:
A centrifugal pump having a system for preventing unscrewing of the impeller off of the pump shaft is disclosed. The impeller is screwed onto the pump shaft via threads having a first thread pitch, and a lock bolt is inserted through the impeller and screwed into the pump shaft via threads having a second thread pitch. The second thread pitch is greater than the first pitch. Accordingly, if the pump motor is operated in the wrong direction, the impeller is prevented from unscrewing because the impeller attempts to move faster axially than the lock bolt which is holding the impeller on the pump shaft.

REFERENCES:
patent: 3359912 (1967-12-01), Gates
patent: 4863353 (1989-09-01), Manninen
patent: 4993864 (1991-02-01), Gjertsen et al.
patent: 5087173 (1992-02-01), Uliana et al.
patent: 5172607 (1992-12-01), Wu
patent: 5340273 (1994-08-01), Rockwood
patent: 5484267 (1996-01-01), Rockwood
patent: 5494299 (1996-02-01), Rockwood
patent: 5513964 (1996-05-01), Rockwood

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