Housing with Diffusion Resistor for Moisture Control
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Solution Overview
Problem
Existing housings for electronic equipment in humid environments face challenges in maintaining a dry interior without being excessively expensive or difficult to maintain, as they require large and costly sealing mechanisms to prevent moisture ingress, which can be impractical for long-term use and frequent maintenance needs.
Innovation Solution
A housing design incorporating a diffusion resistor with a high volume-to-channel area ratio, combined with a moisture resistor that prevents liquid moisture entry while allowing vapor passage, and ventilation means to equalize pressure, reducing moisture diffusion and enabling easy access for maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gastight closure is used to prevent moisture ingress, then protection against moisture is improved, but device complexity and cost increase
Solution Approach 1:
The patent employs a diffusion resistor with porous structure that allows water vapor to pass through while blocking liquid water and salt spray. The porous material creates tortuous paths that increase diffusion resistance without requiring complex sealing mechanisms, thus protecting the electronic circuit while maintaining simplicity.
Solution Approach 2:
The diffusion resistor acts as an intermediary element between the external environment and the housing interior. It mediates moisture transport by selectively allowing vapor passage while blocking liquid and aerosol phases, replacing the need for complex gastight seals.
2Reliability
If large quantities of drying means are arranged in the housing, then moisture absorption is improved, but volume of housing increases
Solution Approach 1:
The patent extracts the moisture control function from the housing interior by placing the diffusion resistor in the wall. This removes the need for large quantities of drying means inside the housing, as the resistor prevents moisture ingress at the source, thereby reducing the volume required for drying agents.
Solution Approach 2:
The diffusion resistor performs preliminary moisture filtration before moisture can enter the housing. By preventing moisture ingress in advance, the system reduces the burden on internal drying means, allowing for smaller quantities and reduced housing volume.
3Reliability
If membrane dimensions are increased to reduce moisture diffusion, then protection against moisture is improved, but pressure response speed decreases
Solution Approach 1:
The diffusion resistor uses porous material with optimized pore structure that provides high moisture blocking capability without requiring large dimensions. The porous structure creates long diffusion paths at the material level, enabling effective moisture protection while maintaining compact size for rapid pressure response.
Solution Approach 2:
The patent changes the parameters of the diffusion resistor (porosity, tortuosity, thickness) to achieve optimal balance between moisture blocking and pressure response. By adjusting these parameters, the system attains high moisture protection with compact dimensions that allow fast pressure equalization.
4Reliability
If gastight sealing is implemented, then protection against moisture is improved, but ease of maintenance deteriorates
Solution Approach 1:
The diffusion resistor serves as a mediator that provides continuous moisture protection without requiring permanent gastight seals. The housing can be opened for maintenance without compromising the moisture protection function, as the resistor remains in place and continues to filter moisture during and after maintenance activities.
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 design effectively maintains low relative humidity for extended periods (at least 5 years) with reduced costs and complexity, allowing for easy opening and closing of the housing while minimizing the volume required for drying means, thus addressing the impracticality of prior art solutions.
Implementation Method 1
at least one diffusion resistor arranged in the passage for reducing the moisture diffusion via the passage between the interior of the container and the outside environment
Implementation Method 2
at least one moisture resistor which is adapted to substantially prevent transport of moisture in the liquid phase and to substantially allow transport of gases and vapours
Implementation Method 3
it is deemed known to arrange a drying means in the housing, for instance in the form of one or more bags of silica gel. Silica gel has the property of absorbing moisture
Data Source
Figure 1~2
Figure 3A~4
AI summary
The present invention relates to a housing for keeping at least one electronic circuit in a substantially dry state, the housing comprising: - a closable container which is adapted to contain the electronic circuit, on which container can be arranged a closing element for closing the electronic circuit from the outside environment; - at least one passage which is arranged in the container and/or the closing element and along which moisture and air can be transported; - at least one diffusion resistor arranged in the passage for reducing the moisture diffusion via the passage between the interior of the container and the outside environment.