Fuel Cutoff Valve Radial Offset Retaining Chamber
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Solution Overview
Problem
Existing fuel cutoff valves fail to effectively prevent liquid fuel from flowing to a canister due to the design of the retaining chamber and tube member alignment, which compromises gas-liquid separation.
Innovation Solution
A fuel cutoff valve design featuring a valve mechanism with a float, a valve body, a retaining chamber defined by a fuel shielding plate, and a liquid reservoir portion, where the communication portion between the retaining chamber and liquid reservoir is positioned to avoid overlapping with the tube body, ensuring efficient gas-liquid separation and preventing liquid fuel from reaching the canister.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the retaining chamber is arranged in the same axial direction as the tube member, then the structure is simplified, but liquid fuel may flow out to the canister through the tube member
Solution Approach 1:
The communication portion is positioned deviated from the tube body in the radial direction, changing the spatial arrangement from axial alignment to radial offset. This dimensional change prevents liquid fuel from reaching the tube member while maintaining structural efficiency
2Device complexity
If the communication portion is positioned to overlap with the tube body, then the gas-liquid separation function is reduced, but the structure is more compact
Solution Approach 1:
The communication portion is positioned deviated from the tube body in the radial direction, creating spatial separation between the liquid fuel flow path and the tube member. This prevents liquid contamination while maintaining compact overall dimensions
3Reliability
If the liquid shielding plate is used to define the retaining chamber, then liquid fuel is retained, but the gas-liquid separation function is compromised
Solution Approach 1:
The liquid shielding plate is strategically positioned to provide liquid retention in specific regions while maintaining gas flow pathways. The deviated communication portion creates local quality differences in the structure, ensuring liquid fuel is retained in the retaining chamber while gas can pass through to the canister
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 design enhances gas-liquid separation and prevents liquid fuel from flowing to the canister, maintaining an air-tight system by allowing liquid fuel to easily return to the valve body through the communication portion, thus improving the fuel cutoff function.
Implementation Method 1
a valve mechanism including a float and a valve body that is disposed above the float
Implementation Method 2
a retaining chamber that is defined in the upper space and that is defined by a fuel shielding plate to retain a liquid fuel stored in the upper space
Implementation Method 3
the liquid fuel stored in the liquid reservoir portion easily returns to the valve body through the communication portion
Data Source
AI summary
A fuel cutoff valve has: a valve mechanism that cuts off a communication between a fuel tank and a canister; an upper space defined above the valve mechanism; a tube body that has a tube passage to be communicated with the upper space and introduces a fuel gas to the canister; a retaining chamber defined by a first fuel shielding portion and a second fuel shielding portion to retain a liquid fuel stored in the upper space; a liquid reservoir portion defined between the tube body and the first fuel shielding portion to store the liquid fuel flowing out of the retaining chamber; and a communication portion through which the retaining chamber communicates with the liquid reservoir portion; wherein the communication portion is formed at a position deviated from the tube body so as not to overlap the tube body, when the tube body is seen in its axial direction.