Feedthrough Device Internal Leak Detection Zone
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Solution Overview
Problem
Conventional feedthrough devices in fuel injector systems face challenges in detecting internal leaks effectively, as they lack a dedicated mechanism to isolate and sense pressure or fuel content changes within the high pressure zone, leading to potential fuel leakage into the low pressure environment.
Innovation Solution
Incorporating an internal leak-detection zone within the feedthrough device, which includes a cavity connected to a leak-detection port, allowing for fluid communication and housing a sensor to detect pressure or fuel content changes, thereby identifying internal leaks and preventing fuel leakage to the external environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional feedthrough devices are used without internal leak-detection zones, then the device complexity is reduced and manufacturing is simpler, but the reliability of leak detection deteriorates and internal leaks cannot be effectively identified
Solution Approach 1:
The feedthrough device is segmented into distinct functional zones: a high-pressure zone, a low-pressure zone, and an internal leak-detection zone. This segmentation allows the leak-detection zone to independently monitor for leaks without interfering with the primary sealing function, thereby improving leak detection reliability while maintaining manageable structural complexity through functional separation.
Solution Approach 2:
The internal leak-detection zone acts as an intermediary chamber between the high-pressure and low-pressure zones. It provides a controlled environment where leaked fuel can be contained and detected by sensors before reaching the external environment, enabling reliable leak identification while preserving the overall simplicity of the feedthrough structure.
2Difficulty of detecting and measuring
If an internal leak-detection zone is incorporated into the feedthrough device, then the ability to detect internal leaks is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The leak-detection port is merged with the existing external environment interface of the feedthrough device. This integration allows the internal leak-detection zone to communicate with the external environment through an already-present opening, eliminating the need for separate detection ports and reducing manufacturing complexity despite the added functional capability.
Solution Approach 2:
The internal leak-detection zone serves multiple functions: it acts as a barrier to prevent leaked fuel from reaching the external environment, provides a controlled space for leak detection sensors, and maintains pressure differential monitoring. This multi-functionality improves leak detection capability while avoiding the need for entirely separate systems that would increase manufacturing difficulty.
3Reliability
If seals are added at both ends of the fluid passage in the feedthrough body, then the isolation of the internal cavity from high and low pressure zones is improved, but the device complexity and number of components increase
Solution Approach 1:
Seals are placed locally at specific critical points where the fluid passage intersects with the high-pressure and low-pressure zones. This localized sealing approach ensures pressure isolation reliability at the most vulnerable interfaces without requiring seals throughout the entire structure, thereby maintaining manageable device complexity while achieving effective pressure zone isolation.
Data Source
Figure 1
Figure 2A~2B
AI summary
A feedthrough device includes first and second opposing outer end faces. The feedthrough device includes an opening, between the first and second opposing outer end faces, that allows fluid communication between an interior and an exterior of the feedthrough device. A conductor extends through the feedthrough device from the first end face, through the interior, to the second end face.