Pumping device with a main pumping stage and a supply pump

Details Pumping device with a main pumping stage and a supply pump Pumping device with a main pumping stage and a supply pump

1993-02-11

1994-10-11

Bertsch, Richard A.

Pumps

Motor driven

Including means utilizing pump fluid for augmenting cooling,...

417273, F04B 3902

Patent

active

053541839

ABSTRACT:
A pumping apparatus is disclosed comprising a tank containing a fluid to be umped, a main pumping stage for pumping a controlled amount of said fluid at a predetermined pressure, a supply pump for supplying fluid from said tank to said main pumping stage in excess to said controlled amount, and feedback means for feeding the excess fluid back to said tank along a given drain path; wherein the improvement includes at least part of said drain path running in regions of said main pumping stage subjected to severe thermal and/or mechanical stress.

REFERENCES:
patent: 1187031 (1916-06-01), Black
patent: 2009881 (1935-07-01), Fourness
patent: 2190246 (1970-02-01), Schirmer
patent: 2472355 (1949-06-01), Wittingham
patent: 2605044 (1952-07-01), Hill
patent: 4681514 (1987-07-01), Griese et al.
patent: 4865525 (1989-09-01), Kern
patent: 4952121 (1990-08-01), De Matthaeis et al.
patent: 4975025 (1990-12-01), Yamamura et al.
patent: 4990066 (1991-02-01), Kean
patent: 5152677 (1992-10-01), Bauer et al.

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