Fuel Supply Nozzle Guide Vapor Flow Control
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Solution Overview
Problem
Conventional fuel supply apparatuses fail to ensure smooth joining of fuel vapor with liquid fuel, leading to potential reverse flow and splash of liquid fuel due to high fuel vapor flow rates, and existing configurations do not adequately address this issue.
Innovation Solution
A fuel supply apparatus with a nozzle guide featuring a vapor flow path and slow-down portions, including first and second ribs, that slow down fuel vapor flow before it joins with liquid fuel, preventing reverse flow and splash.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fuel vapor is allowed to flow freely through the fuel supply apparatus, then the fuel vapor can be circulated back to the fuel tank, but the fuel vapor flow rate becomes too high causing reverse flow and splash of liquid fuel
Solution Approach 1:
A flow control valve is introduced as an intermediary component between the fuel vapor port and the fuel passage. This valve mediates the interaction between high-velocity fuel vapor and liquid fuel by providing flow resistance and pressure drop, preventing the harmful reverse flow and splash while maintaining the beneficial fuel vapor circulation function
Solution Approach 2:
The flow control valve changes the flow parameters of fuel vapor by creating a pressure drop and reducing flow velocity. The valve transforms the high-velocity fuel vapor flow into a controlled, lower-velocity flow that can safely mix with liquid fuel without causing reverse flow or splash, while still maintaining effective fuel vapor circulation
2Reliability
If the breather port diameter is increased to improve fuel vapor circulation, then more fuel vapor can be circulated, but the structural strength of the filler pipe is reduced
Solution Approach 1:
The filler pipe structure is segmented into multiple functional zones: a breather port for fuel vapor circulation, a flow control valve for flow regulation, and a reinforced structural section for strength. This segmentation allows the breather port to be optimized for vapor circulation without compromising the overall structural integrity of the filler pipe assembly
Solution Approach 2:
The flow control valve acts as an intermediary that allows a smaller breather port diameter to achieve effective fuel vapor circulation. By providing flow resistance and pressure drop, the valve compensates for the reduced port size, maintaining circulation efficiency while preserving the structural strength of the filler pipe
Data Source
AI summary
A fuel supply apparatus comprises a filler neck body including a hollow fuel passage-forming structure configured to form a fuel passage and a fuel vapor port branched off from the fuel passage-forming structure; and a nozzle guide formed in a tubular shape to introduce a fueling nozzle. The nozzle guide includes a vapor flow path portion configured to introduce fuel vapor flowing into the fuel vapor port in a tank direction. The vapor flow path portion has a slow-down portion configured to slow down the fuel vapor introduced in the tank direction.