Pressure Vessel Filling Neck Venting Against Dirt and Freezing
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Solution Overview
Problem
Existing filling devices for motor vehicle pressure vessels face challenges in preventing dirt and contamination from entering the pressure vessel while allowing gas exchange between the filling volume and the environment, leading to potential liquid accumulation and freezing issues.
Innovation Solution
The filling device incorporates a ventilation duct with a labyrinth-type profile and direction reversals, a semi-permeable membrane, and filter elements to ensure reliable protection against contamination and moisture, enabling effective venting and drying of the filling volume through a gas exchange system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the filling volume is completely sealed to prevent contamination, then protection against dirt is improved, but gas exchange and venting capability deteriorate
Solution Approach 1:
The dust cap incorporates a porous filter element that allows gas molecules to pass through while blocking liquid droplets and particulate contamination. This enables the filling volume to maintain gas exchange capability for venting and drying while achieving protection against harmful contaminants through the porous filtration mechanism.
Solution Approach 2:
The ventilation duct with labyrinth profile acts as an intermediary structure between the filling volume and external environment. It provides a controlled pathway for gas exchange while the dust cap with filter element serves as an intermediary filtering mechanism that separates harmful contaminants from breathable gas molecules.
2Adaptability or versatility
If a simple opening is provided for venting, then gas exchange is improved, but protection against liquid and dirt ingress deteriorates
Solution Approach 1:
The ventilation duct features a labyrinth profile with multiple direction reversals and curved pathways instead of a straight opening. This curved, convoluted path utilizes surface tension and gravity to prevent liquid droplets and dirt particles from reaching the filling volume, while still allowing gas molecules to pass through for effective venting and drying.
Solution Approach 2:
The dust cap with integrated filter element serves as an intermediary structure positioned at the opening of the ventilation duct. It provides the primary barrier against liquid and dirt ingress while maintaining the venting function, and the labyrinthine duct structure provides a secondary protective mechanism.
3Ease of manufacture
If the ventilation duct is made straight and simple, then manufacturing is improved, but contamination protection and drying efficiency deteriorate
Solution Approach 1:
The ventilation duct employs a labyrinth profile with curved sections and direction reversals that can be manufactured as an integrated molded component. While more complex than a straight duct, this curved geometry provides superior contamination protection and drying efficiency through the physical barriers created by the convoluted path, and the integrated design maintains reasonable manufacturing feasibility.
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 effectively prevents contamination and moisture ingress, ensures reliable venting and drying of the filling volume, and maintains the filling volume's integrity by allowing gas exchange while preventing liquid accumulation and freezing.
Implementation Method 1
at least one ventilation duct which in regions is delimited by the dust cap and in this way at least in regions extends through the dust cap. The ventilation duct extends from the filling volume into an environment that by means of the cover element in the closed position thereof is separated from the housing interior
Implementation Method 2
The at least one ventilation duct can be protected in relation to invading moisture or splash water by means of the membrane, in particular the gas-permeable and liquid-impermeable membrane
Implementation Method 3
at least one filter element to be provided, wherein the at least one filter element is disposed so as to separate an entry opening of the ventilation duct from an exit opening of the ventilation duct
Implementation Method 4
liquid can be transported by means of gas, in particular air, from the filling volume into the environment of the motor vehicle by way of the at least one ventilation duct while venting of the filling volume takes place at the same time. As a result, the filling volume can be dried, or be kept dry
Data Source
AI summary
A filling device for a pressure vessel of a motor vehicle includes a filling neck via which an operating medium can be filled into a pressure vessel, a dust cap which can be plugged onto the filling neck and which, together with the filling neck, delimits a filling volume. A housing apparatus includes a main element and a cover element which can be adjusted relative to the main element between an open position and a closed position which, together with the main element, delimits a housing interior. The dust cap is arranged in the housing interior. At least one ventilation channel, which is delimited in regions by the dust cap, extends from the filling volume into an environment separated from the housing interior by way of the cover in its closed position and has at least one direction-reversing element.