The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 06, 1979
Filed:
Oct. 26, 1977
Applicant:
Inventor:
Paul Koeller, Dorval, CA;
Assignee:
Dominion Engineering Works Limited, Lachine, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01D / ;
U.S. Cl.
CPC ...
415116 ; 60696 ; 415119 ;
Abstract
A hydraulic turbo-machine such as a Francis turbine has a draft tube with air admission provision, to stabilize flow. A plurality of air boxes are provided having a long upstream surface and a short downstream surface to provide an inductive effect with the flow of water downwardly thereover. A non-return valve at the box downstream face substantially precludes the ingress of water within the box during conditions of disturbed flow, so that the breathing capability of the box is optimized.