Hydrogen Hose Fitting Crimp Sleeve for High-Pressure Sealing
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Solution Overview
Problem
High-pressure hydrogen fluid lines require a fitting that ensures a tight connection while minimizing hydrogen permeation, which existing technologies fail to achieve effectively due to mechanical stress and high operating pressures.
Innovation Solution
A fitting with a nipple and press sleeve design that includes an annular groove with a sealing element, such as an O-ring, and a dedicated sealing element pressing projection that enhances the sealing effect by clamping the hose section against the sealing element, combined with uneven hose retaining surfaces to promote a secure and tight connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional compression sleeve design is used to connect the hose to the nipple, then the connection can be assembled, but the sealing effect is insufficient under high pressure and hydrogen permeation occurs
Solution Approach 1:
The compression sleeve is equipped with a dedicated sealing element compression projection that locally concentrates compression force on the sealing element. This projection extends circumferentially and is spaced apart from other compression projections, creating a localized high-compression zone that enhances the sealing effect specifically at the sealing element-hose interface, preventing hydrogen permeation while maintaining overall connection reliability
Solution Approach 2:
The sealing element compression projection is pre-positioned on the compression sleeve to engage with the sealing element before final crimping occurs. This preliminary action ensures the sealing element is properly seated and compressed against the hose inner surface from the beginning of the crimping process, establishing an effective seal before full mechanical connection is achieved
2Strength
If the hose is pressed tightly onto the nipple to ensure a tight connection, then connection strength improves, but the complexity of the fitting design increases
Solution Approach 1:
The compression sleeve's inner side features multiple compression projections arranged spaced apart in the axial direction, with the sealing element compression projection being one distinct segment. This segmentation allows different regions of the compression sleeve to perform different functions: the sealing element compression projection focuses on sealing, while other compression projections provide structural support and distribution of compression forces, achieving strong connection without excessive overall complexity
Solution Approach 2:
The compression sleeve serves multiple functions through its integrated design: it provides mechanical compression for connection strength, houses the sealing element compression projection for sealing, and distributes forces through multiple compression projections. This multi-functionality reduces the need for separate components, maintaining design simplicity while achieving both tight connection and effective sealing
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 solution achieves a high-tightness connection capable of withstanding pressures up to 2000 bar with minimal hydrogen permeation, ensuring reliable operation in high-pressure hydrogen applications.
Implementation Method 1
a sealing element, in particular designed as an O-ring, is arranged in the annular groove to seal the nipple against an inner surface of the hose
Implementation Method 2
an end section of the hose is pushed onto a nipple of the fitting and pressed onto the nipple using a compression sleeve of the fitting (e.g., crimped), whereby the compression sleeve is plastically deformed
Data Source
Figure 1
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AI summary
A fitting (10) for connecting a hose (20), in particular for high-pressure hydrogen fluid lines, with a nipple (30) and a crimp sleeve (40), wherein an end section (21) of the hose (20) can be slid onto the nipple (30) and crimped onto the nipple (30) by means of the crimp sleeve (40) in a sealing manner, wherein the nipple (30) has an annular groove (34) in which a sealing element (35) for sealing the nipple (30) against an inner surface (22) of the hose (20) is arranged, wherein the crimp sleeve (40) has on its inner side (41) several crimping projections (42) arranged axially spaced apart from one another as well as a sealing element crimping projection (43) which at least partially covers the sealing element (35) in the axial direction.