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US 12,366,207 B2Granted
Variable displacement pump (VDP) systems with dry-out centrifugal main pump
AssigneeHamilton Sundstrand Corporation
InventorsRyan Shook, Ryan Prescott Susca
Life of this patent
Estimating the term…
Abstract
A fuel system a main fuel pump sub-system (MFP) with an inlet for receiving a supply of fuel from an inlet line. The MFP has a main outlet line configured to supply fuel to a main fuel throttle valve assembly (MFTV), and a cross-over outlet line. A variable displacement pump sub-system (VDPP) has a first inlet connected in fluid communication with the cross-over outlet line, a second inlet connected to a branch of the main outlet line, a first outlet line configured to connect to supply fuel to the MFTV, and a second outlet line configured to connect to supply fuel to an actuation system.
Claims20
A fuel system comprising:
- a main fuel pump sub-system (MFP) with an inlet for receiving a supply of fuel from an inlet line, wherein the MFP has a main outlet line configured to supply fuel to a main fuel throttle valve assembly (MFTV), and a cross-over outlet line;
- and
- a variable displacement pump sub-system (VDPP) with a first inlet connected in fluid communication with the cross-over outlet line, a second inlet connected to a branch of the main outlet line, a first outlet line configured to connect to supply fuel to the MFTV, and a second outlet line configured to connect to supply fuel to an actuation system;
- wherein the MFTV includes an MFTV check valve (MFTV CV) connected in fluid communication between the main outlet line and the first outlet line of the VDPP, configured to prevent flow from the main outlet line to the first outlet line of the VDPP, and to allow flow from the first outlet line of the VDPP to the main outlet line;
- and
- wherein the MFTV includes a selector valve (MFTV SV) connected in fluid communication with the first outlet line of the VDPP, with the branch of the main outlet line upstream of the MFTV CV, and with an engine line, wherein the MFTV SV is configured to select between the main outlet line and the first outlet line of the VDPP to supply fuel from the MFTV to the engine line.
3 more elements
A fuel system comprising:
- a main fuel pump sub-system (MFP) with an inlet for receiving a supply of fuel from an inlet line, wherein the MFP has a main outlet line configured to supply fuel to a main fuel throttle valve assembly (MFTV), and a cross-over outlet line;
- a variable displacement pump sub-system (VDPP) with a first inlet connected in fluid communication with the cross-over outlet line, a second inlet connected to a branch of the main outlet line, a first outlet line configured to connect to supply fuel to the MFTV, and a second outlet line configured to connect to supply fuel to an actuation system;
- a first return line connected in fluid communication with the inlet of the MFP, configured to return flow from the actuation system;
- a second return line connected in fluid communication with an ejector of the MFP, configured to return flow from the MFP to an inlet of a boost pump;
- a third return line connected in fluid communication with the first return line, configured to return flow from an augmentor fuel control (AFC) to the first return line;
- and
- a fourth return line configured to return flow from the MFTV to the MFP.
4 more elements
A fuel system comprising:
- a main fuel pump sub-system (MFP) with an inlet for receiving a supply of fuel from an inlet line, wherein the MFP has a main outlet line configured to supply fuel to a main fuel throttle valve assembly (MFTV), and a cross-over outlet line;
- a variable displacement pump sub-system (VDPP) with a first inlet connected in fluid communication with the cross-over outlet line, a second inlet connected to a branch of the main outlet line, a first outlet line configured to connect to supply fuel to the MFTV, and a second outlet line configured to connect to supply fuel to an actuation system;
- and
- a stabilizing check valve (SCV) in the main outlet line;
- wherein the MFP includes:
- a filter in a pump feed line, wherein the filter is connected in fluid communication with the inlet of the MFP;
- and
- a pump bypass line connecting in fluid communication from the filter to a point in the main outlet line downstream of the SCV, wherein the pump bypass line includes a check valve (CV) configured to prevent backflow from the main outlet line to the filter.
5 more elements
Dependencies are inferred from the claim text.