Air Gate Seal Assembly for Leak-Tight ECS Isolation Valves
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Solution Overview
Problem
Existing air cycle machines in environmental control systems for aircraft lack an efficient valve mechanism to coordinate airflow effectively between compressors, leading to potential leakage and inefficiencies in air distribution.
Innovation Solution
An isolation valve with a movable air gate and a seal assembly that conforms to the housing internal surface, using a fastening mechanism and biasing device to form a sealed connection, allowing the air gate to move between positions to control airflow to specific outlets, thereby preventing leakage and ensuring efficient airflow distribution between air cycle machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a valve mechanism is added to coordinate airflow between compressors, then airflow distribution efficiency is improved, but device complexity increases
Solution Approach 1:
The air gate is divided into multiple independent sections, each capable of being positioned to control flow to different outlets. This segmentation allows precise airflow distribution to multiple compressors while using a single integrated valve body, improving productivity without excessive complexity increase
Solution Approach 2:
The single air gate structure performs multiple functions by selectively positioning different portions to control airflow to different outlets. This multi-functional design improves airflow distribution efficiency for multiple compressors while avoiding the need for separate valve mechanisms for each compressor, thus limiting complexity growth
2Reliability
If a seal assembly is added to prevent air leakage, then system reliability is improved, but device complexity increases
Solution Approach 1:
The seal assembly is merged with the air gate structure, forming an integrated component rather than a separate assembly. The seal member is positioned within a groove on the air gate itself, and the retainer structure combines both sealing and fastening functions. This merging improves reliability by ensuring proper sealing while minimizing the increase in device complexity through integration
Solution Approach 2:
The seal member is nested within a groove on the air gate, and the retainer is nested over the seal assembly. This nested structure provides effective sealing and secure retention while maintaining a compact design that limits overall complexity increase
3Reliability
If the seal is made conformable to housing internal surface, then sealing effectiveness is improved, but manufacturing precision requirements increase
Solution Approach 1:
The seal member is designed with material properties that allow it to deform and conform to the housing internal surface. By selecting appropriate seal materials with suitable elasticity and compliance, the system achieves effective sealing while tolerating normal manufacturing variations in the housing surface, thus improving reliability without excessively increasing manufacturing precision requirements
4Reliability
If a fastening mechanism is added to secure the seal, then sealing reliability is improved, but device complexity increases
Solution Approach 1:
The retainer structure combines both sealing support and fastening functions into a single component. The retainer secures the seal member while also providing structural support for the air gate assembly. This merging of functions improves seal retention reliability while minimizing complexity increase by avoiding separate fastening mechanisms
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 isolation valve effectively seals the outlets, preventing air leakage and allowing for precise control of airflow to either air cycle machine, enhancing the efficiency and reliability of the environmental control system.
Implementation Method 1
the seal is configured to conform to a shape of the housing internal surface and apply sealing pressure to the housing internal surface to form the sealed connection with the internal surface
Implementation Method 2
using a fastening mechanism and biasing device to form a sealed connection
Data Source
Figure 1~2
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AI summary
An isolation valve comprising: a housing (202) having an internal surface (204) within the housing, the internal surface having a first outlet (221) and second outlet (222); an air gate (250) having an outward face opposite the internal surface, the air gate located within the housing and configured to move to at least one of a first position blocking flow to the first outlet, a neutral position blocking flow to neither the first outlet nor second outlet, and a second position blocking flow to the second outlet; a seal groove (254) located on the outward face of the air gate; a seal (410) located within seal groove, the seal configured to form a sealed connection with the internal surface around at least one of the first outlet when in the first position and the second outlet when in the second position; a retainer (420) configured to secure the seal within the seal groove using a fastening mechanism; and a biasing device (512) configured to apply a force to the seal that allows the seal to conform to a shape of the housing internal surface and apply a sealing pressure to the housing internal surface to form the sealed connection with the internal surface.