Hydraulic turbine spiral case drain

Details Hydraulic turbine spiral case drain Hydraulic turbine spiral case drain

F - Mech Eng,Light,Heat,Weapons

03

B

138/32.07

F03B 13/06 (2006.01) F03B 3/02 (2006.01) F03B 11/00 (2006.01)

Patent

CA 1040057

HYDRAULIC TURBINE SPIRAL CASE DRAIN ABSTRACT OF THE DISCLOSURE A hydraulic turbine is provided with means for ad- mitting pressurized air into the runner housing to depress the water in the draft tube. Wicket gates are provided to isolate the runner from water in the spiral case. A shutoff valve in the penstock isolates the spiral case and wicket gates from the water pressure in the forebay. A water passageway connects the water in the draft tube to the water in the space between the shutoff valve and the wicket gates. This water passageway passes through an elevation higher than the highest point of the spiral case and it is exposed to the air pressure in the draft tube to insure that the water in the space between the shutoff valve and wicket gates is not siphoned into the draft tube.

232105

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