Abradable and/or abrasive coating and brush seal configuration

A brush-type sealing and coating technology, which is applied in engine sealing, coating, metal material coating process, etc., can solve problems such as rotor damage, achieve enhanced temperature and pressure performance, reduce bristle bending stress, and compress drop and temperature performance improvement effect

Inactive Publication Date: 2006-11-29
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One difficulty with using stronger brush backplates that can withstand higher temperatures is damage to the rotor as a result of contact between the rotor and the stronger backplate

Method used

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  • Abradable and/or abrasive coating and brush seal configuration

Examples

Experimental program
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Effect test

Embodiment Construction

[0007] figure 1 Is a cross-sectional perspective view showing the brush holder assembly 10 engaged with a rotor 11 of a turbine (not shown). The brush holder assembly 10 includes a plurality of wire bristles 12 engaging a surface 13 of a rotor 11 . The bristles 12 are located between a front plate 14 and a back plate 15 which provides support for the bristles 12 . The tops of the bristles 12, front plate 14 and back plate 15 including the brush holder assembly 10 are welded together. They are mounted in the sealing ring 16 and are held in the sealing ring 16 by a set screw 17 which pushes the shoulder 18 of the front plate 14 against a notch in the sealing ring 16 designed to accommodate the shoulder 18 19 in. The seal ring 16 is in turn supported by a seal holder 20 mounted in the turbine.

[0008] The brush holder assembly 10 is urged against the surface 13 of the rotor 11 by a spring assembly (not shown), which spring assembly exerts a defined force on the assembly 10 i...

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Abstract

An abradable coating and / or an abrasive coating applied to the rotor (11) of a steam or gas turbine allows the temperature and pressure drop capabilities of conventional brush seal assemblies to be increased. The pressure drop capability of brush seals is closely related to fence height (22), i.e., the distance between the rotor (11) and the bottom edge of the backing plate (15) supporting the brush seal wire bristles (12). Application of the abradable or abrasive coating allows the fence height to be reduced and the pressure capability of a brush seal assembly increased commensurately because the risk of the backing plate (15) rubbing against the surface (13) of the rotor (11), so as to cause damage to the rotor (11), is reduced. In addition, the backing plate (15) can be made from a higher strength material that can withstand higher temperatures because any contact between the backing plate (15) and the rotor (11) results in no damage to the rotor (11), but rather a gradual reduction of the backing plate (15) as it wears.

Description

technical field [0001] The present invention relates to turbomachines and more particularly to the application of an abradable coating and / or abrasive coating with turbomachine brush seals to improve their pressure drop and temperature performance. Background technique [0002] Turbine brush seals are contact seals that typically include a highly flexible seal assembly composed of thousands of continuous wire bristles that conform to the moving surface of the turbine rotor. Typically, wire bristles are made from a collection of extremely fine metal bristles that form a curtain to create a seal and are sufficiently compliant to withstand the motion of the rotor. Typically, the bristles have a low wear rate. [0003] Currently, brush seals are used in the high pressure (HP), intermediate pressure (IP), low pressure (LP) and end sealing (packing) areas of combined single-flow and reverse-flow rotors. However, the application of brush seals to this area is limited by the backp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D11/12C23C4/04
CPCF16J15/3288F16J15/445F16J15/442
Inventor M·W·科沃尔茨克B·A·库蒂尔F·D·C·里瓦斯
Owner GENERAL ELECTRIC CO
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