Hydrogen Safety Joint Cover Structure for O-Ring Protection
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Solution Overview
Problem
Existing safety joints in hydrogen gas filling devices face issues with O-rings coming off due to high-pressure hydrogen gas flow and potential damage from foreign matter, as there is no effective technique to prevent this in current designs.
Innovation Solution
The safety joint design incorporates a hollow cover that surrounds the O-ring, reducing direct exposure to high-pressure hydrogen gas and foreign matter, with a recessed O-ring placement and a shutter mechanism to protect the sealing means during operation, preventing dislodgment and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an O-ring is used as the second sealing means in the valve body, then sealing function is provided, but the O-ring may come off due to high-speed ultra-high pressure hydrogen gas flow
Solution Approach 1:
The hollow cover is disposed inside the flow passage to surround and protect the O-ring, creating a nested structure where the cover encloses the vulnerable sealing component, preventing direct exposure to high-speed gas flow
Solution Approach 2:
The hollow cover acts as an intermediary protective barrier between the high-speed hydrogen gas flow and the O-ring, shielding the sealing means from harmful flow effects without interfering with its sealing function
2Reliability
If an O-ring is used as the second sealing means in the valve body, then sealing function is provided, but the O-ring may be damaged by foreign matter in the hydrogen gas
Solution Approach 1:
The hollow cover surrounds the O-ring within the flow passage, creating a protective enclosure that prevents foreign matter in the gas stream from directly contacting and damaging the sealing component
Solution Approach 2:
The hollow cover serves as a protective intermediary that filters out foreign matter from the hydrogen gas flow before it can reach the O-ring, while still allowing the sealing function to operate effectively
3Object-affected harmful factors
If the hollow cover surrounds the valve body in the flow passage, then the O-ring is protected from high-speed gas flow, but the flow passage area is reduced
Solution Approach 1:
The hollow cover is strategically positioned to provide protection only in the specific region where the O-ring is located, rather than enclosing the entire flow passage, thus maintaining adequate flow area while providing targeted protection
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 effectively prevents O-ring dislodgment and damage by reducing high-speed hydrogen gas flow within the cover and shielding the O-ring from foreign matter, ensuring reliable sealing and safety during hydrogen gas filling operations.
Implementation Method 1
an elastic body 13 that presses the valve body 12 in a direction of the two flow passages 11A-2, 11A-3 in the plug body 11
Implementation Method 2
a first sealing means 12S1 formed by the tapered portion 12B of the valve body 12 coming into contact with the valve seat 11B of the plug body 11
Data Source
AI summary
To provide a safety joint that can prevent an O-ring from falling off due to an ultra-high pressure hydrogen gas flowing through a flow passage in the safety joint at high speed and from being damaged by a foreign matter coming into contact with the O-ring if the foreign matter is mixed in the hydrogen gas.