Deformable Membrane Sealing for Sensor Gas Exchange
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Solution Overview
Problem
Conventional sensor and sound detection devices are vulnerable to liquid ingress through their access channels, which can compromise their functionality and reliability, especially in harsh environments.
Innovation Solution
The development of liquid-tight/water-tight sensor and sound detection devices with a passive sealing mechanism that uses a deformable membrane to automatically close access channels upon exposure to liquid, ensuring reliable protection without the need for a control system or actuator, and utilizing a water-impermeable or water-repellent design to prevent water ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If access channels are provided for air/gas exchange, then functionality is improved, but liquid ingress vulnerability increases
Solution Approach 1:
The membrane automatically seals the access channel when liquid contacts it, without requiring external control systems, sensors, or actuators. The membrane's own deformation in response to liquid contact closes the channel, making the system self-protecting and cost-effective.
Solution Approach 2:
A deformable membrane is used to cover the access channel opening. The membrane can flex and deform when contacted by liquid, automatically closing the channel to prevent liquid ingress while allowing air and gas to pass through when dry.
2Reliability
If membranes are used for sealing, then liquid protection is improved, but device complexity increases
Solution Approach 1:
The membrane is positioned and oriented such that liquid contact directly causes it to deform and seal the access channel. No additional control mechanisms, sensors, or actuators are needed - the membrane itself performs the sealing function through its own deformation, simplifying the overall device structure.
Solution Approach 2:
The membrane transitions from an open state (allowing air/gas exchange) to a closed state (preventing liquid ingress) dynamically in response to liquid contact. This dynamic behavior provides reliable liquid-tight protection without requiring complex mechanical sealing structures.
3Ease of manufacture
If passive closing mechanism is used, then manufacturing cost is reduced, but sealing reliability must be maintained
Solution Approach 1:
The deformable membrane serves as both the sealing element and the actuating mechanism. When liquid contacts the membrane, it deforms and closes the access channel, providing reliable sealing without requiring expensive control systems, sensors, or actuators, thus maintaining cost-effectiveness.
Solution Approach 2:
The membrane automatically performs the sealing function through its own deformation when liquid contacts it. This self-service mechanism eliminates the need for additional components, simplifying manufacturing while maintaining reliable liquid-tight protection.
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 solution effectively prevents liquid ingress into the devices, maintaining their functionality even when submerged in water, while allowing air and gas exchange when dry, thus enhancing their environmental robustness and cost-effectiveness.
Implementation Method 1
Wetting an outer side 20b of the respective membrane 20 (facing away from inner side 20a of the membrane) with liquid/water triggers a deformation of the respective membrane 20
Implementation Method 2
the at least one associated access channel is kept open via at least one gap between the at least one contact surface of the respective membrane in its initial position and the at least one associated membrane contact surface
Data Source
AI summary
A sensor and/or sound detection device having a sensing device having a sensitive surface, an access channel being designed in such a way that air and/or a gas is transferable through the open access channel between a spatial surroundings of the sensor/detection device and the sensitive surface, and an at least partially water-impermeable membrane having respectively an inner side of the membrane facing the associated access channel being designed in such a way that a contact surface on the respective inner side of the respective membrane is pressed against an associated membrane contact surface on the associated access channel in such a way that the associated access channel is sealed in a liquid-tight manner when an outer side of the respective membrane or a covering layer on the respective outer side of the membrane is wetted with at least a minimum quantity of liquid and the respective membrane is deformed.