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DAMPER CLIP FOR A SERVICE TUBE

IP.com Disclosure Number: IPCOM000249632D
Publication Date: 2017-Mar-09
Document File: 11 page(s) / 1M

Publishing Venue

The IP.com Prior Art Database

Abstract

In a gas turbine engine, a damper clip attached to a service tube provides mid span damping and also assists in moving natural frequencies out of the engine's operating range.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 34% of the total text.

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DAMPER CLIP FOR A SERVICE TUBE

ABSTRACT

[0001] In a gas turbine engine, a damper clip attached to a service tube provides mid span

damping and also assists in moving natural frequencies out of the engine's operating

range.

BACKGROUND

[0002] This disclosure relates generally to gas turbine engines and more particularly to

service tubes in such engines.

[0003] A typical gas turbine engine includes one or more shafts which carry

turbomachinery blading which is enclosed by one or more stationary casings of the

engine.

[0004] The shafts are mounted for rotation in several bearings, usually of the rolling-

element type. The bearings are enclosed in enclosures called "sumps" which are

pressurized and provided with an oil flow for lubrication and cooling.

[0005] The engine is provided with several "service tubes" each of which is a pipe, tube,

or conduit generally extending from one of the sumps (or other interior engine

component) to one of the casings, in a generally radial direction.

[0006] The service tubes may serve to transport fluids such as air, oil, fuel, or hydraulic

fluids within the engine. The service tubes may also serve as passageways or conduits for

structure such as electrical wires or actuating rods.

[0007] One problem with service tubes is that they are generally of a relatively small

diameter with thin walls and extend over a relatively large axial length. In operation,

engine vibrations can excite one or more natural frequencies of the service tubes, leading

to cracking and failure.

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[0008] Described herein are damper clips configured to stiffen service tubes and prevent

cracking.

BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The concept may be best understood by reference to the following description

taken in conjunction with the accompanying drawing figures, in which:

[0010] FIGS. 1A-1E illustrate several variations of a damper clip having a pair of legs or

wings configured in a U- or V-shape;

[0011] FIGS. 2A-2F illustrate several variations of a damper clip having a pair of legs or

wings configured in a spiral shape;

[0012] FIGS. 3A-3C illustrate several variations of a damper clip having a pair of clip

members secured to opposite sides of a service tube ;

[0013] FIGS. 4A-4D illustrate several variations of a damper clip incorporating a

corrugated shape;

[0014] FIGS. 5A and 5B illustrate a damper clip including pair of legs or wings with an

additional compression spring placed between them; and

[0015] FIGS. 6A-6C illustrate a tube having two or more damper clips attached thereto,

each damper clip having a single leg configured in a spiral shape.

DETAILED DESCRIPTION OF THE CONCEPT

[0016] Illustrated in FIG. 1A is a schematic representation of a strut and service tube

assembly suitable for inclusion in a gas turbine engine. The strut 10 has spaced-apart

sidewalls 12 defining a hollow interior space 14.

[0017] A service tube 16 passes through the hollow interior space 14. The service tube 16

defines an internal bore 18 whi...