Metal working – Method of mechanical manufacture – Impeller making
Patent
1997-06-13
1999-04-27
Cuda, Irene
Metal working
Method of mechanical manufacture
Impeller making
298897, 298896, B23P 1500
Patent
active
058966579
ABSTRACT:
A method of making a reaction turbine blade for enhancing the level of dissolved gas in water passing through a turbine. The method includes the steps of machining a blank to have an overall blade profile and control points, and fixedly securing a perimeter of a plate to a region of the blank. The plate has a region spaced from the blank to form a gas channel leading from an inner edge of the blank to an outer edge of the blank. The partially formed blade comprising the blade profile and attached plate is then formed into the shape of a hydrofoil having a curved pressure surface and a curved gas channel. A shallow groove may be formed on one of the suction surface and the pressure surface leading from the inner edge toward the outer edge, with the plate secured to the blank overlying the shallow groove. Alternatively, the plate may have a concave surface facing the blank and spaced from the blank, with a perimeter of the plate secured to the blank to form a gas channel leading from the inner edge toward the outer edge.
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Beyer James R.
Fisher, Jr. Richard K.
Cuda Irene
Voith Hydro, Inc.
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