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:
Feb. 18, 2020
Filed:
Jan. 10, 2017
Rolls-royce Plc, London, GB;
Ian J Toon, Leicester, GB;
ROLLS-ROYCE plc, London, GB;
Abstract
A gas turbine engine fuel system including a combustor with at least one fuel injector, a fuel manifold that supplies fuel to each injector, a drain tank in fluid communication with the fuel manifold, and a vacuum generator that selectively provides below atmospheric pressure to the drain tank and includes first and second chambers separated by a flexible diaphragm. The fuel system also includes a first check valve that allows one-way flow from the fuel manifold into the fuel injector, and a second check valve that allows one-way flow from the fuel injector to the fuel manifold. The vacuum generator reduces a pressure within the second chamber causing the diaphragm to increase a volume of the first chamber and reduce a volume of the second chamber, such that expanding the first chamber causes below atmospheric pressure in the drain tank and fuel manifold, and the second check valve opens.