The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 30, 1998
Filed:
Jan. 27, 1997
Terence R Pellow, Bristol, GB;
Rolls-Royce PLC, London, GB;
Abstract
A gas turbine engine turbomachine (10) comprises a turbine section (18) in which cooling air is supplied from a compressor section (14) via a pipe (68) to a chamber (60). The chamber (60) supplies the cooling air through passages (58) in the nozzle guide vanes (30) to impinge upon a stator disc (32). A valve (70) in the pipe (68) is used to switch the flow of cooling air on and off. The valve (70) is opened to allow the cooling air to cool the stator disc (32) to shrink the stator disc (32) to minimise clearance between a shroud (34) supported by the nozzle guide vanes (30) and the turbine blades (28) during one mode of operation. The valve (70)is closed to allow the stator disc (32) to expand to increase the clearance between the shroud (34) and the turbine blades (28).