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US 11,629,652 B2Granted
Metering pump system
AssigneeHamilton Sundstrand Corporation
InventorsCharles E. Reuter, Morgan O'Rorke
Life of this patent
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Abstract
A fuel system including a fuel tank, a first pump fluidly coupled to the fuel tank configured for distributing fuel from the fuel tank throughout the fuel system, and a second pump fluidly coupled to the first pump by a pressure regulating valve and configured for driving fuel to an engine.
Claims10
A fuel system comprising:
- a fuel tank;
- a first pump fluidly coupled to the fuel tank configured for distributing fuel from the fuel tank throughout the fuel system, wherein the first pump is a positive displacement pump;
- a second pump fluidly coupled to the first pump by a pressure regulating valve and configured to meter fuel to an engine, wherein the pressure regulating valve is a throttling regulator, and is configured to introduce a pressure drop between the first and second pumps to maintain a pressure rise, wherein the pressure regulating valve is hydro-mechanically controlled;
- first and second hydraulic sense lines, wherein the first hydraulic sense line is operatively connecting the pressure regulating valve to downstream from the second pump, and the second hydraulic sense line operatively connecting the pressure regulating valve to upstream from the second pump;
- a fuel filter positioned upstream from the first pump, between the fuel tank and first pump;
- and
- a mass flow meter downstream of the second pump configured to provide feedback to a speed control of the second pump and to trim a steady-state fuel delivery, wherein the mass flow meter provides a shut off to the engine.
4 more elements
Dependencies are inferred from the claim text.