Weighted Cap Assembly for Self-Closing Discharge Outlet Protection
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Solution Overview
Problem
Existing cap assemblies for discharge lines in fuel cell electric vehicles fail to effectively protect the outlet end from exposure after detachment, leading to potential corrosion and malfunction due to rainwater and foreign substance ingress, compromising safety and reliability.
Innovation Solution
A cap assembly with a retainer member and cap member that autonomously moves to close the discharge line when pressure is relieved, utilizing a weight member to return to the closed position without additional assembly, incorporating a sealing member and guide structure to stabilize the cap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cap member is made movable to allow fluid discharge, then the discharge function is improved, but the protection function deteriorates because the outlet end remains exposed after discharge
Solution Approach 1:
The cap member is designed to be movable rather than fixed, allowing it to transition between a closed position (providing protection) and an open position (allowing discharge). The cap member moves in response to fluid pressure differential, automatically opening when discharge is needed and returning to closed position when discharge is complete, thus dynamically adapting between protection and discharge functions
Solution Approach 2:
The cap member operates autonomously based on the pressure differential across the discharge line without requiring external control mechanisms. When the fluid pressure inside the discharge line exceeds the external pressure, the cap member automatically opens to allow discharge. When discharge is complete and pressure equalizes, the cap member automatically returns to the closed position, providing self-regulating protection and discharge functionality
2Adaptability or versatility
If the outlet end is directed upward to meet discharge regulations, then the discharge direction compliance is improved, but the protection function deteriorates due to rainwater and foreign substance ingress
Solution Approach 1:
The cap member provides dynamic sealing that adapts to the upward discharge orientation. When closed, it seals the outlet end to prevent rainwater and foreign substance ingress despite the upward orientation. When discharge is needed, it opens to allow compliant upward discharge, thus dynamically resolving the conflict between maintaining seal integrity and enabling regulated discharge direction
Solution Approach 2:
The cap member is positioned and sealed at the outlet end before any discharge operation, creating a preliminary protective barrier against rainwater and foreign substances. This preliminary sealing action maintains protection during periods when the discharge line is not in use, while still allowing upward discharge compliance when activated
3Reliability
If a separate protection device is added to protect the outlet end, then the protection function is improved, but the device complexity increases
Solution Approach 1:
The protection function and discharge control function are merged into a single cap member assembly. The cap member simultaneously serves as both the protective cover for the outlet end and the discharge control mechanism, eliminating the need for separate protection devices and reducing overall assembly complexity while maintaining both protection and discharge functionalities
Solution Approach 2:
The cap member is designed with multi-functionality, serving both as a protective seal and as a discharge control valve. This single component performs multiple functions: sealing the outlet end to prevent contamination, allowing controlled discharge when pressure differential activates it, and automatically returning to sealed position when discharge is complete, thereby eliminating the need for additional separate protection devices
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
Ensures stable discharge while preventing exposure and ingress of foreign substances, maintaining safety and reliability by autonomously closing the outlet end after discharge, without additional assembly steps.
Implementation Method 1
a weight member provided in the cap member and configured to apply a load to the cap member so that the cap member moves to the first position when the discharge pressure applied to the cap member by the target fluid is eliminated
Data Source
AI summary
A cap assembly includes a retainer member provided at an outlet end of a discharge line through which a target fluid is discharged to the outside in a gravitational direction, the retainer member having a guide hole configured to guide the target fluid to the outside, a cap member configured to be movable from a first position at which the cap member closes the guide hole to a second position at which the cap member opens the guide hole in accordance with a discharge pressure of the target fluid, and a weight member provided in the cap member and configured to apply a load to the cap member so that the cap member moves to the first position when the discharge pressure applied to the cap member by the target fluid is eliminated.