Venting Device Guide Arc Filler Pipe Vapor Separation
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Solution Overview
Problem
Existing ventilation systems for motor vehicle tanks struggle with high gas volume flows and liquid saturation, leading to inadequate separation and potential damage to fuel vapor filters, particularly activated charcoal filters, due to limited operational volume in separating nozzles.
Innovation Solution
A ventilation device with a guide arc in the filler pipe directs vapor to escape through a degassing outlet while liquid flows back into the tank, utilizing the filler pipe's volume for separation, and includes a moveable flap to manage refueling vapor flow, with components positioned to minimize installation space and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a small separating nozzle is used on the filler pipe, then installation space is reduced, but separation reliability deteriorates under high gas volume flows
Solution Approach 1:
The patent combines the separating function with the existing filler pipe by integrating a separating chamber into it. The filler pipe serves dual purposes: as the refueling conduit and as the separation device housing. This merging eliminates the need for separate dedicated separating nozzles while ensuring reliable separation under high gas volume flows during instant venting operations.
Solution Approach 2:
The filler pipe is transformed into a multi-functional component that simultaneously performs refueling and vapor-liquid separation. The separating chamber integrated into the filler pipe allows it to handle both functions, making the system more efficient and reducing installation space while maintaining separation reliability under various operating conditions including high gas volume flows.
2Reliability
If a dedicated intermediate reservoir is used for liquid separation, then separation capacity is improved, but installation space and device complexity increase
Solution Approach 1:
Instead of using a separate intermediate reservoir, the patent merges the separation chamber directly into the filler pipe structure. The filler pipe contains an integrated separating chamber that performs liquid-fuel separation, eliminating the need for dedicated external reservoirs and reducing installation space while maintaining adequate separation capacity.
Solution Approach 2:
The separating chamber is nested within the filler pipe structure. The chamber is positioned inside the filler pipe's volume, utilizing the existing space efficiently. This nesting approach allows the separation function to be housed within the refueling conduit without requiring additional external installation space.
3Area of stationary object
If separation is performed in a connecting nipple, then installation space is minimized, but the operating volume for separation is insufficient under high gas volume flows
Solution Approach 1:
The patent merges the separation chamber with the filler pipe body, creating a larger integrated separation volume. This combined structure provides sufficient operating volume to handle high gas volume flows during instant venting operations, unlike small connecting nipples, while still maintaining compact installation through the integration approach.
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 solution ensures reliable separation of liquid fuel even under high gas volume flows, protecting fuel vapor filters and reducing installation space and manufacturing costs by leveraging the filler pipe's volume for separation, while maintaining efficient vapor flow to the filter.
Implementation Method 1
a guide arc (6) arranged in the filler pipe (1) and shaped to guide incoming vapor passing through the ventilation inlet (3) into the filler pipe (1) between an inner wall of the filler pipe and the guide arc along a periphery of the filler pipe, so that a gaseous component of the incoming vapor escapes through the degassing outlet (5) and a liquid component of the incoming vapor flows off through the filler pipe (1)
Data Source
AI summary
A ventilation device for ventilating a motor vehicle tank. The ventilation device includes a filler pipe, a ventilation line, a degassing line, and a guide arc member. The ventilation line is to be fluidically connected at a first ventilation line end to the motor vehicle tank, and at a second ventilation line end to the filler pipe via a ventilation inlet. The degassing line is to be fluidically connected at a first degassing line end to the filler pipe via a degassing outlet. The guide arc member is arranged in the filler pipe to define a guide path for incoming vapor passing through the ventilation inlet into the filler pipe. The guide arc member is to facilitate flow of the incoming vapor between an inner wall of the filler pipe and the guide arc member along a periphery of the filler pipe along a periphery of the filler pipe such that a gaseous component of the incoming vapor escapes through the degassing outlet and a liquid component of the incoming vapor flows off through the filler pipe.