Direct metering using a variable displacement vane pump

Patent metadata

Field	Value
Publication number	US-9574500-B2
Application number	US-201514595591-A
Country	US
Kind code	B2
Filing date	Jan 13, 2015
Priority date	Feb 28, 2014
Publication date	Feb 21, 2017
Grant date	Feb 21, 2017

Abstract

A direct metering architecture is provided having a metering pump and a servo pump wherein the metering and servo pumps are driven by an engine shaft by way of a gearbox transmission. The system reduces wasted horsepower previously occurring with oversized fixed displacement pumps, reduces instances of engine flameout and reduces the amount of heat added to fuel which ultimately improves engine oil cooling.

First claim

The invention claimed is:

1. A direct metering architecture for a gas turbine engine fuel supply system, comprising:
an engine power takeoff shaft providing a mechanical power input to a transmission;
said transmission providing at least one driving output to a variable displacement metering pump and a servo pump;
an engine burn flow circuit having said variable displacement metering pump metering an engine burn flow of fuel for engine burn;
a servo flow circuit having said servo pump providing a servo flow of fuel for actuation of said variable displacement metering pump;
wherein said servo flow of fuel and said engine burn flow of fuel are isolated from each other and interactions between said servo flow of fuel and said engine burn flow of fuel are reduced.

2. The direct metering architecture of claim 1 further comprising a pressure regulator in said servo flow circuit.

3. The direct metering architecture of claim 1 further comprising a shutoff valve disposed between said variable displacement metering pump and a combustor.

4. The direct metering architecture of claim 3 further comprising a fuel return extending from said shutoff valve to a servo pump feed line.

Assignees

• Gen Electric

Inventors

• Kelly Lauren Marie
• Goeller Robert Edward
• Mailander William James

Classifications

• F02C9/263

  by means of fuel metering valves · CPC title

• F02C9/26

  Control of fuel supply (F02C9/48 takes precedence; fuel valves F02C7/232) · CPC title

• F02C7/236

  Fuel delivery systems comprising two or more pumps · CPC title

• F02C7/232

  Fuel valves {(control of fuel supply by means of fuel metering valves F02C9/263)}; Draining valves or systems (valves in general F16K) · CPC title

• F02C9/30 Primary

  characterised by variable fuel pump output · CPC title