OIL PURGE SYSTEM FOR A MID TURBINE FRAME
First Claim
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1. A gas turbine engine having a mid turbine frame, the mid turbine frame comprising:
- a bearing housing and an annular outer case connected together by a plurality of radial struts;
an annular inter-turbine duct disposed radially between the annular bearing housing and the annular outer case for conducting hot gases axially through the mid turbine frame, the annular inter-turbine duct defining a plurality of radial hollow strut fairings extending therethrough; and
an oil transfer tube and a heat shield tube around the oil transfer tube defining an annular cavity therebetween, the heat shield tube being substantially surrounded by pressurized air, the oil transfer and heat shield tubes being received at a respective inner end thereof in an oil port of the bearing housing and extending radially downwardly through a radial passage of the annular inter-turbine duct and through an opening in the outer case, the oil transfer and heat shield tubes terminating at a respective outer end thereof projecting outwardly from an annular wall of the outer case, the outer end of the oil transfer tube being configured for fluid connection with an oil system, the annular cavity being in fluid communication with the pressurized air through a first passage located in a position adjacent the inner end of the heat shield tube, the annular cavity being in fluid communication with a second passage located outside the annular wall of the outer case, the second passage being configured for fluid connection with a leaked-oil dumping area located outside the outer case.
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Abstract
An oil purge system for a mid turbine frame (MTF) of a gas turbine engine has an oil transfer tube surrounded by a heat shield tube. The oil transfer and heat shield tubes extend at their respective inner ends downwardly from an oil port of a bearing housing and terminate at their respective outer ends projecting outwardly from an annular wall of an outer case of the MTF. Oil leaked from the oil port is purged by pressurized air through an annular cavity formed between the oil transfer and heat shield tubes, and is discharged out of the MTF.
25 Citations
19 Claims
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1. A gas turbine engine having a mid turbine frame, the mid turbine frame comprising:
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a bearing housing and an annular outer case connected together by a plurality of radial struts; an annular inter-turbine duct disposed radially between the annular bearing housing and the annular outer case for conducting hot gases axially through the mid turbine frame, the annular inter-turbine duct defining a plurality of radial hollow strut fairings extending therethrough; and an oil transfer tube and a heat shield tube around the oil transfer tube defining an annular cavity therebetween, the heat shield tube being substantially surrounded by pressurized air, the oil transfer and heat shield tubes being received at a respective inner end thereof in an oil port of the bearing housing and extending radially downwardly through a radial passage of the annular inter-turbine duct and through an opening in the outer case, the oil transfer and heat shield tubes terminating at a respective outer end thereof projecting outwardly from an annular wall of the outer case, the outer end of the oil transfer tube being configured for fluid connection with an oil system, the annular cavity being in fluid communication with the pressurized air through a first passage located in a position adjacent the inner end of the heat shield tube, the annular cavity being in fluid communication with a second passage located outside the annular wall of the outer case, the second passage being configured for fluid connection with a leaked-oil dumping area located outside the outer case. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for purging oil leakage from a mid turbine frame of a gas turbine engine, the mid turbine frame including at least a bearing housing and an annular outer case connected together by a plurality radial struts, and an annular inter-turbine duct disposed between the bearing housing and the outer case for conducting hot gases, the method comprising:
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a) providing a heat shield tube around an oil transfer tube to create an annular cavity therebetween, the cavity extending radially downwardly from an oil port of the bearing housing and terminating outside the outer case to allow oil leaked from between the bearing housing oil port and the oil transfer tube to drain into the cavity; b) introducing pressurized air into the cavity adjacent the oil port of the bearing housing for purging the leaked oil down along the cavity and out of the outer case of the mid turbine frame; and c) directing the leaked oil purged from the cavity into a leaked-oil dumping area of the engine. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification