Spillstrip design for elastic fluid turbines and a method of str

Details Spillstrip design for elastic fluid turbines and a method of str Spillstrip design for elastic fluid turbines and a method of str

1996-08-13

1998-07-07

Kwon, John T.

Rotary kinetic fluid motors or pumps

With separating means or guard for solid matter in working...

4151735, 4151736, 4151745, 277 53, F01D 1108

Patent

active

057758735

ABSTRACT:
Disclosed is an improved spillstrip ring for use in forming a tip seal in an axial flow elastic fluid turbine having one or more stages. Each turbine stage has a diaphragm and a rotor. The spillstrip ring consists of an arrangement of spillstrips mounted in a circumferentially groove formed in the diaphragm. Each spillstrip includes a body portion having a longitudinal extent, a vertical extent, and a horizontal extent, and is particularly adapted for mounting in the circumferential groove in the diaphragm. At least one projection extends from the body portion substantially parallel to the vertical extent thereof, and along the longitudinal extent of the body portion. Such projection has tapered side walls which converge to a tip seal that continuously extends along the longitudinal extent of the body portion. At least one of the spillstrips has at least one narrow channel formed entirely through a portion of the vertical extent of the body portion and beneath each projection, without interrupting the tip portion continuously extending along the longitudinal extent of the body portion. During turbine operation, the channel functions to bypass oxide particles entrained in the steam flow, around the rotor blades in order to reduce the residing time of these particles between the rotor blades and diaphragm nozzles, without interrupting the continuously extending tip seal.

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Turbine Product Brochure from the Quabbin Division of IMO Industries, Inc. Turbine Geometry, Sep. 1992.

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