Sealing Structure Pressure Release Grooves High-Pressure Removal
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Solution Overview
Problem
The existing sealing structures for high-pressure hydrogen tanks in fuel cell vehicles face challenges in easily removing the insertion member due to increased torque requirements caused by accumulated high-pressure hydrogen, leading to deteriorated workability.
Innovation Solution
The sealing structure incorporates a columnar insertion member with a cylindrical inserted member, featuring an O-ring and backup rings, along with pressure release grooves or bores that communicate with external space, allowing for depressurization and reducing friction forces during removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If backup rings are provided to seal high-pressure hydrogen that passes through the O-ring, then sealing reliability is improved, but friction force increases when removing the insertion member
Solution Approach 1:
The patent introduces pressure release grooves that allow high-pressure hydrogen to be discharged from the sealing region before the insertion member is removed. This preliminary depressurization action eliminates the high-pressure state that causes excessive friction, enabling easy removal while maintaining sealing reliability during operation
Solution Approach 2:
The patent extracts the high-pressure hydrogen from the sealing region through pressure release grooves and discharge holes, separating the hydrogen containment function from the removal operation. This allows the insertion member to be removed without the hindrance of trapped high-pressure hydrogen
2Reliability
If high-pressure hydrogen is accumulated in the sealing region between the O-ring and backup ring, then sealing function is maintained, but torque required for unscrewing the shaft increases
Solution Approach 1:
The pressure release grooves and discharge holes enable preliminary depressurization of the sealing region before the unscrewing operation. By discharging high-pressure hydrogen in advance, the torque required for unscrewing is reduced to normal levels while the sealing function remains intact during pressurized operation
Solution Approach 2:
The pressure release grooves act as intermediary channels that provide a controlled path for high-pressure hydrogen to escape from the sealing region. This intermediary structure mediates between the need for high-pressure sealing and the need for easy unscrewing, allowing pressure management without compromising either function
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
This configuration enables easy removal of the insertion member by equalizing pressure within the sealing region to external pressure, reducing the required torque and improving workability while preventing damage to components.
Implementation Method 1
a first pressure release groove is formed in the axial direction so as to extend at least on the inner peripheral surface of the inserted member between the assembling part and the accommodation region, and communicates with an external space via a gap between the assembling parts
Data Source
AI summary
The object of the present invention is to provide a sealing structure which enables an insertion member to be removed easily from an inserted member. The sealing structure includes valve body, a mouth ring, an O-ring that is accommodated in an accommodation region formed by an inner peripheral surface of the mouth ring and an outer peripheral surface of the valve body, and prevents the fluid from leaking, and backup rings which are accommodated on both sides of the O-ring in the accommodation region, and restrict a movement of the O-ring. The valve body and the mouth ring are formed with screw parts to be fitted or screwed to each other when they are assembled, and first pressure release grooves are formed in the axial direction so as to extend at least on the inner peripheral surface of the mouth ring between the screw parts and the accommodation region.