Pressure Regulating Valve Assembly With Mixed-Pressure Sensing
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Solution Overview
Problem
Pneumatic pressure regulating valves in anti-ice systems for gas turbine engines fail to manage increased pressure and associated temperature rises, leading to overheating of components like the intake lip.
Innovation Solution
A pressure regulating valve assembly with a chamber having first and second entry orifices connected to the upstream and downstream sides of the valve, and an exit orifice connected to a sense pressure port, where the pressure at the sense pressure port is maintained constant, allowing it to be a function of both upstream and downstream pressures, thereby reducing downstream pressure and mass flow when upstream pressure increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the valve downstream pressure is regulated to a constant set value, then the pressure at the valve downstream side is maintained constant, but the temperature increase associated with increased upstream pressure is not addressed, leading to overheating of components
Solution Approach 1:
The patent introduces a feedback mechanism where the sense pressure port samples the downstream pressure and feeds it back to the regulating means (diaphragm assembly). This closed-loop feedback allows the valve to automatically adjust its opening based on actual downstream pressure conditions, enabling dynamic compensation for temperature effects while maintaining pressure stability.
Solution Approach 2:
The patent changes the controlled parameter from purely pressure-based control to a combined pressure-temperature control system. By sensing downstream pressure and using it to modulate valve opening, the system indirectly controls mass flow to compensate for temperature increases, effectively adding thermal compensation to the pressure regulation mechanism.
2Stress or pressure
If the valve opening is increased to handle increased upstream pressure, then the pressure regulation capability is maintained, but the mass flow increases, causing overheating of the intake lip
Solution Approach 1:
The feedback mechanism through the sense pressure port and diaphragm assembly allows the valve to respond dynamically to downstream pressure changes. When upstream pressure increases causing temperature rise, the system adjusts valve opening to maintain downstream pressure while reducing mass flow, preventing overheating.
Solution Approach 2:
The valve assembly performs self-regulation by using the downstream pressure itself as the control signal. The sense pressure port samples the downstream pressure, and this pressure directly actuates the diaphragm to adjust valve opening, creating a self-service control system that automatically compensates for temperature effects without external intervention.
3Device complexity
If a simple pressure regulating valve is used, then the structure is simple, but it cannot compensate for temperature increases associated with pressure increases
Solution Approach 1:
The patent introduces a sense pressure port as an intermediary element that samples downstream pressure and transmits it to the diaphragm assembly. This intermediary mechanism enables temperature compensation functionality without requiring complex sensors or control systems, maintaining relative simplicity while adding thermal compensation capability.
Solution Approach 2:
The patent uses pneumatic principles where downstream pressure itself acts as the control medium. The sense pressure port captures downstream pressure, which then acts on the diaphragm to mechanically adjust valve opening. This pneumatic feedback mechanism provides temperature compensation using only fluid pressure, avoiding complex electronic or mechanical control systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively counters increased temperature and pressure by reducing downstream pressure and mass flow, preventing overheating and allowing the use of higher stage bleed air, while maintaining a stable operating point.
Implementation Method 1
a chamber (80) having a first entry orifice (81) connected to the upstream side (51) of the valve (50), a second entry orifice (82) connected to the downstream side (52) of the valve (50)
Data Source
AI summary
A pressure regulating valve assembly includes: a valve having an upstream side receiving an input flow and a downstream side providing an output flow, an actuator for opening and closing the valve, including partially opening the valve, and a regulator controlling the actuator to open, close or partially open the valve. The regulator includes a sense pressure port, wherein pressure at the port is maintained constant by the regulator. A chamber has a first entry orifice, a second entry orifice and an exit orifice. The first entry orifice is connected to the upstream side, the second entry orifice is connected to the downstream side, and the exit orifice is connected to the port. The exit orifice provides that the pressure at the exit orifice lies between the pressure at the first entry orifice and the pressure at the second entry orifice.