Browse Prior Art Database

LABYRINTH SEAL ELEMENT WITH COMBINATION OF STRAIGHT AND ANGLED SEAL TEETH

IP.com Disclosure Number: IPCOM000244489D
Publication Date: 2015-Dec-16
Document File: 8 page(s) / 139K

Publishing Venue

The IP.com Prior Art Database

Abstract

[0001] This disclosure relates to "labyrinth" seals which are a type of noncontact seal used between two rotating elements or a rotating element and a stationary element, for example in gas turbine engines. A labyrinth seal includes one or more thin annular flanges often referred to as "seal teeth". Described herein is a hybrid labyrinth seal configuration with a mixture of straight and slanted seal teeth. This configuration is useful for permitting protective coatings to be applied to the seal teeth using conventional processes, while still providing good sealing performance.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 38% of the total text.

Page 01 of 8

LABYRINTH SEAL ELEMENT WITH COMBINATION OF STRAIGHT AND ANGLED SEAL TEETH

ABSTRACT


[0001] This disclosure relates to "labyrinth" seals which are a type of noncontact seal used between two rotating elements or a rotating element and a stationary element, for example in gas turbine engines. A labyrinth seal includes one or more thin annular flanges often referred to as "seal teeth". Described herein is a hybrid labyrinth seal configuration with a mixture of straight and slanted seal teeth. This configuration is useful for permitting protective coatings to be applied to the seal teeth using conventional processes, while still providing good sealing performance.

BACKGROUND


[0002] This disclosure relates generally to gas turbine engines, and more particularly to sealing elements for gas turbine engines.


[0003] Gas turbine engines often incorporate noncontact seals between two rotating elements or a rotating element and a stationary element. One common type of noncontact seal is a so-called "labyrinth seal" which includes one or more thin annular flanges often referred to as "seal teeth".


[0004] Typically, the seal teeth comprise a metallic alloy. The seal teeth may be protected by coating them with a known type of environmentally-resistant coating material.


[0005] Current labyrinth seal tooth design often uses teeth designed with a slanted or "angled" configuration for better sealing capabilities. Because of the inclination angle, it can be difficult to apply environmentally-resistant coating using direct spray methods. Special coating processes are available but may be more costly and/or time-consuming than direct spray.

- 1 -


Page 02 of 8

BRIEF DESCRIPTION OF THE DRAWINGS


[0006] The concept may be best understood by reference to the following description taken in conjunction with the accompanying drawing figures, in which:


[0007] FIG. 1 is a schematic cross-sectional view of a component including a labyrinth seal;


[0008] FIG. 2 is a schematic cross-sectional view of a component including an alternative labyrinth seal; and


[0009] FIG. 3 is an enlarged view of a portion of FIG. 2.

DETAILED DESCRIPTION OF THE CONCEPT


[0010] Now, referring to the drawings wherein identical reference numerals denote the same elements throughout the various views, FIG. 1 illustrates an exemplary rotating component 10 incorporating a labyrinth seal 12 . The component 10 is generally a body of revolution about axis "A" and when viewed in half-section, presents generally an L- shaped structure with a radial arm 14 and an axial arm 16.


[0011] The labyrinth seal 12 includes a body 18 with an upstream end 20 and a downstream end 22, and incorporates two or more seal teeth, generally referred to at 24. As used herein, the term "seal tooth" refers to a relatively thin annular structure or flange extending away from a body.


[0012] When assembled in an engine, an annular structure 26 is positioned with a sealing surface 28 thereof in close proximity to the seal tee...