Aircraft Bleed Air Valve Assembly for Sleeve Orientation Verification
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Solution Overview
Problem
The assembly of bleed air valves in aircraft engines poses challenges due to the complexity of aligning and orienting sleeve components correctly, which can lead to mis-orientation and potential operational issues.
Innovation Solution
The design incorporates a piston housing with a cylindrical chamber and a sleeve that extends longitudinally, featuring distinct axial surfaces and recesses to ensure proper stacking and orientation, with the piston body and sleeve being axially stacked onto a flange, allowing for verification of correct assembly through visual inspection of the sleeve end's position relative to an axial landmark.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring-mounted piston with sealing ring is used in the sleeve, then the valve can effectively seal bearing cavities and control air flow, but the assembly process becomes complex and prone to mis-orientation
Solution Approach 1:
The piston body incorporates asymmetric features including a directional keyway and asymmetric sealing surfaces that must be oriented in specific directions during assembly. This asymmetry ensures correct orientation of the piston within the sleeve, preventing mis-assembly while maintaining effective sealing between the piston and sleeve walls.
Solution Approach 2:
The piston body is pre-equipped with integrated features such as the keyway and sealing surfaces during manufacturing, so that when assembled into the sleeve, the correct orientation is predetermined. This preliminary preparation of orientation features simplifies the assembly process by eliminating the need for complex alignment procedures during final assembly.
2Reliability
If the piston body is directional with axial side features, then proper sealing and function are achieved, but visual verification of correct assembly becomes difficult
Solution Approach 1:
The piston body incorporates visual indicators such as colored bands, painted surfaces, or contrasting material sections that are visible through the sleeve or at the piston ends. These color-coded indicators provide immediate visual confirmation that the piston is correctly oriented, allowing quality inspectors to verify proper assembly without disassembly or complex measurement tools.
3Reliability
If multiple sleeve components are used for sealing and control, then valve functionality is improved, but the quantity of parts increases and assembly time increases
Solution Approach 1:
The piston body integrates multiple functions into a single component: it provides sealing surfaces against the sleeve, incorporates the keyway for directional orientation, includes air flow control features, and provides mounting surfaces for the spring assembly. By merging these previously separate components into one integrated piston body, the number of parts is reduced and assembly operations are simplified, improving productivity while maintaining full valve functionality.
Data Source
AI summary
A valve for an air system in an aircraft engine, comprising: a housing defining a chamber having a valve axis; a body within the chamber about a piston axis collinear with the valve axis, extending from a first surface to a second surface, defining a bore extending from the first to the second surface, having a mating connector defined by the second surface and located radially outward of the bore relative to the piston axis; and a sleeve extending from a first end matingly engaged with the mating connector to a second end along a sleeve axis collinear with the valve axis, the first end axially stacked on the body via the first surface to define a first distance between the first end and the first surface, and via the second surface to define a second distance between the first end and the second surface greater than the first distance.