Aircraft Oxygen Pressure Reducer for Stable High-Flow Supply
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Solution Overview
Problem
Existing aircraft oxygen supply systems face limitations in maintaining stable outlet pressure at higher mass flows due to operational constraints of pressure reducers, leading to inefficiencies and reduced operational ranges.
Innovation Solution
An aircraft oxygen supply system with a pressure reducer design featuring a piston, axial gas flow path, and radial pressure control chamber, which stabilizes outlet pressure by controlling piston movement through gas flow dynamics, including turbulences, to maintain consistent pressure even at higher oxygen flows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pressure reducer is used in the aircraft oxygen supply system, then the system structure is simple, but the outlet pressure becomes unstable at higher mass flows
Solution Approach 1:
The pressure reducer is segmented into distinct functional zones: a high-pressure inlet region, a mid-pressure control region with the pressure control chamber, and a low-pressure outlet region. The piston divides the internal volume into a control volume and a flow volume, allowing independent control of pressure reduction and flow management. This segmentation enables stable outlet pressure by isolating the control mechanism from the high-flow outlet region.
Solution Approach 2:
The pressure control chamber acts as an intermediary between the high-pressure inlet and the outlet. It receives high-pressure oxygen through the pressure reducing gas flow path and regulates it before delivery. The chamber volume, controlled by piston movement, serves as a buffer that stabilizes pressure fluctuations, preventing direct transmission of pressure variations from the inlet to the outlet.
2Productivity
If the mass flow rate is increased to supply oxygen to multiple masks, then the oxygen supply capacity is improved, but the outlet pressure decreases
Solution Approach 1:
The system employs feedback control through the piston mechanism. The pressure control chamber monitors the outlet pressure conditions, and the piston automatically adjusts its position in response to pressure changes. When outlet pressure drops due to increased flow demand, the pressure differential across the piston causes it to move, opening the pressure reducing gas flow path wider to increase the opening action and restore pressure.
Solution Approach 2:
The pressure reducer transitions from a static pressure reduction device to a dynamic control system. The piston moves continuously in response to changing flow conditions, automatically adjusting the opening action of the pressure reducing gas flow path. This dynamic adjustment enables the system to maintain stable outlet pressure across a wide range of mass flow rates, from single-mask to multi-mask operation.
3Reliability
If the pressure reducer opening action is increased to maintain pressure at higher flows, then the outlet pressure stability is improved, but the piston control becomes more complex
Solution Approach 1:
The pressure control system is self-regulating through the piston's automatic response to pressure differentials. The piston uses the pressure difference between the pressure control chamber and the outlet chamber as its control signal, eliminating the need for external control mechanisms. The system serves itself by using the outlet pressure conditions to drive the piston adjustment, which in turn maintains the outlet pressure.
Solution Approach 2:
The control mechanism utilizes pneumatic pressure differentials to actuate the piston. The pressure control chamber and outlet chamber form a pneumatic control system where pressure differences directly move the piston without mechanical linkages or electronic controls. This pneumatic actuation simplifies the control mechanism while providing responsive pressure regulation.
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
The described design ensures stable outlet pressure at higher mass flows, reducing the need for additional control mechanisms and safety features, and optimizing oxygen supply efficiency for multiple masks, including those for pilots and military personnel.
Implementation Method 1
stabilizes outlet pressure by controlling piston movement through gas flow dynamics
Implementation Method 2
controlling piston movement through gas flow dynamics, including turbulences
Implementation Method 3
A high pressure oxygen supply is coupled to a pressure reducer, which reduces the pressure of the high pressure oxygen supply to a reduced pressure
Data Source
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AI summary
An aircraft oxygen supply system (2) comprises at least one oxygen mask (12), an oxygen supply (20), and a pressure reducer (26), interposed between the oxygen supply (20) and the at least one oxygen mask (12). The pressure reducer (26) comprises a housing (28), a piston (30), which is axially movable within the housing (28), a high pressure inlet (32), which is provided on a high pressure side of the housing (28) and which is coupled to the oxygen supply (20), a pressure reducing gas flow path (34), connecting the high pressure inlet and (32) an axial gas flow channel (36) within the piston (30), a reduced pressure outlet (38), which is provided on a reduced pressure side of the housing (28) and to which the axial gas flow channel (36) opens, and a pressure control chamber (40), which extends radially from the reduced pressure outlet (38) and which is interposed between the housing (28) and a reduced pressure end face (46) of the piston (30).