Fuel Cap Pressure Valve Segmentation for Sealing Integrity
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Solution Overview
Problem
Existing fuel cap pressure control valves with rubber seating portions suffer from elastic deformation, which impairs sealing performance, especially in high valve-opening pressure specifications, as deformation can be transferred between adjacent seating portions.
Innovation Solution
The fuel cap incorporates an engagement mechanism with a support concave portion and protrusion between seating portions to reduce elastic deformation transfer, using a flexible valve body with flexion depressions to enhance sealing performance by allowing each seating portion to deform independently without impairing the other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible valve body made of rubber is used to enhance sealing performance, then the sealing performance is improved, but elastic deformation occurs at the seating portion which impairs sealing performance of adjacent seating portions
Solution Approach 1:
The valve body is divided into multiple independent seating portions (first seating portion and second seating portion) that are separated by the engagement mechanism. This segmentation prevents elastic deformation from propagating between adjacent seating portions, allowing each to maintain its sealing function independently while still being part of the same flexible valve body structure.
Solution Approach 2:
The engagement mechanism acts as an intermediary element between adjacent seating portions. It provides mechanical support and isolation, preventing the transmission of elastic deformation forces between neighboring seating areas while allowing the flexible valve body to maintain its overall sealing function.
2Stress or pressure
If high valve-opening pressure specifications are required, then pressure control capability is improved, but elastic deformation at seating portions increases significantly
Solution Approach 1:
The engagement mechanism changes the mechanical parameters of the valve body structure by providing additional support points. This alters the stress distribution and deformation characteristics of the flexible valve body under high pressure conditions, reducing excessive elastic deformation at seating portions while maintaining the required high valve-opening pressure capability.
3Adaptability or versatility
If multiple seating portions are arranged adjacent to each other on the same seating surface, then valve functionality is improved, but deformation transfer between adjacent portions impairs sealing
Solution Approach 1:
The engagement mechanism segments the valve body structure at strategic locations between adjacent seating portions. This segmentation allows multiple seating portions to be arranged on the same seating surface for enhanced valve functionality while preventing deformation transfer between them, thus maintaining sealing performance.
Solution Approach 2:
The engagement mechanism provides localized structural reinforcement and deformation control at specific positions between seating portions. This local quality enhancement allows the flexible valve body to maintain overall versatility with multiple seating portions while preventing harmful deformation transfer in critical areas.
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 engagement mechanism effectively reduces elastic deformation impact on one seating portion from the other, maintaining sealing performance even under increased pressure, thereby preventing deterioration of the sealing function.
Implementation Method 1
a first valve body, formed with a flexible material, that opens and closes the first valve passage; when the pressure inside the fuel tank rises beyond a specified range, the first seating portion of the first valve body is pressed by a first seal portion
Implementation Method 2
the engagement mechanism includes a support concave portion and a support protrusion inserted into the support concave portion, disposed between the first seating portion and second seating portion, so as to reduce elastic deformation transferred from one of the first and second seating portions to the other
Data Source
AI summary
The pressure control valve comprises a negative pressure valve and a positive pressure valve. The negative pressure valve comprises a negative pressure valve body, a valve retaining member and an engagement mechanism. The engagement mechanism comprises a support concave portion formed on the negative pressure valve body and a support protrusion formed on the valve retaining member and inserted into the support concave portion, which is formed to reduce the elastic deformation transferred to a second seating portion, when a first seating portion is pressed by a first seal portion to undergo elastic deformation.