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Title: Leaf seal for inner and outer casings of a turbine

Abstract

A plurality of arcuate, circumferentially extending leaf seal segments form an annular seal spanning between annular sealing surfaces of inner and outer casings of a turbine. The ends of the adjoining seal segments have circumferential gaps to enable circumferential expansion and contraction of the segments. The end of a first segment includes a tab projecting into a recess of a second end of a second segment. Edges of the tab seal against the sealing surfaces of the inner and outer casings have a narrow clearance with opposed edges of the recess. An overlying cover plate spans the joint. Leakage flow is maintained at a minimum because of the reduced gap between the radially spaced edges of the tab and recess, while the seal segments retain the capacity to expand and contract circumferentially.

Inventors:
 [1];  [2]
  1. (Hendersonville, NC)
  2. (Simpsonville, SC)
Issue Date:
Research Org.:
General Electric Company (Schenectady, NY)
OSTI Identifier:
874643
Patent Number(s):
6431555
Assignee:
General Electric Company (Schenectady, NY) NETL
DOE Contract Number:  
FC21-95MC31176
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
leaf; seal; inner; outer; casings; turbine; plurality; arcuate; circumferentially; extending; segments; form; annular; spanning; sealing; surfaces; adjoining; circumferential; gaps; enable; expansion; contraction; segment; projecting; recess; edges; narrow; clearance; opposed; overlying; cover; plate; spans; joint; leakage; flow; maintained; minimum; reduced; gap; radially; spaced; retain; capacity; expand; contract; cover plate; sealing surface; annular seal; /277/415/

Citation Formats

Schroder, Mark Stewart, and Leach, David. Leaf seal for inner and outer casings of a turbine. United States: N. p., 2002. Web.
Schroder, Mark Stewart, & Leach, David. Leaf seal for inner and outer casings of a turbine. United States.
Schroder, Mark Stewart, and Leach, David. Tue . "Leaf seal for inner and outer casings of a turbine". United States. https://www.osti.gov/servlets/purl/874643.
@article{osti_874643,
title = {Leaf seal for inner and outer casings of a turbine},
author = {Schroder, Mark Stewart and Leach, David},
abstractNote = {A plurality of arcuate, circumferentially extending leaf seal segments form an annular seal spanning between annular sealing surfaces of inner and outer casings of a turbine. The ends of the adjoining seal segments have circumferential gaps to enable circumferential expansion and contraction of the segments. The end of a first segment includes a tab projecting into a recess of a second end of a second segment. Edges of the tab seal against the sealing surfaces of the inner and outer casings have a narrow clearance with opposed edges of the recess. An overlying cover plate spans the joint. Leakage flow is maintained at a minimum because of the reduced gap between the radially spaced edges of the tab and recess, while the seal segments retain the capacity to expand and contract circumferentially.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {1}
}

Patent:

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