Oil tube with integrated heat shield
AssigneePratt & Whitney Canada Corp.
InventorsEric DUROCHER, John WATSON
Life of this patent
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Abstract
A gas turbine engine has an oil tube for delivering oil through a high temperature zone of the engine to an engine component for cooling and lubrication. An insulation tube surrounds the oil tube and extends in a substantial length of the oil tube. The opposed ends of the insulation tube are integrally and sealingly connected to respective end portions of the oil tube to form a dead air annulus between the oil tube and the insulation tube.
Claims20
A gas turbine engine comprising an array of hollow airfoils within an annular duct supported in an engine case assembly and a heat insulation system for an oil tube extending through one of the hollow airfoils, the heat insulation system including an insulation tube surrounding the oil tube and extending substantially along a length of the oil tube, the insulation tube having one of a weld and a braze joint at each of its opposed ends which integrally and scalingly connect the insulation tube to the oil tube, thereby defining a dead air annulus between the oil tube and the insulation tube.
A gas turbine engine having an oil tube for delivering oil through a high temperature zone of the engine to an engine component, the oil tube comprising:
- a tubular body extending in a substantial length of the oil tube and axially between opposed end portions, each of the end portions including an annular shoulder extending radially outwardly with respect to the tubular body;
- and
- an insulation tube surrounding the tubular body, the insulation tube having opposed ends integrally and scalingly affixed to the respective annular shoulders, thereby defining a sealed annulus between the tubular body and the insulation tube.
A method for fabricating an oil tube with integrated heat shield for a gas turbine engine, comprising
- (a) providing an oil tube having an annular shoulder located at each of opposed ends of the oil tube, the shoulders radially outwardly extending with respect to a tubular body which extends between the opposed ends;
- (b) providing an insulation tube;
- (c) inserting the oil tube into the insulation tube until the two shoulders are adjacent to opposed ends of the insulation tube, respectively;
- and
- (d) securing the ends of the insulation tube to the respective shoulders by applying one of weld and braze.
Dependencies are inferred from the claim text.