Sensor Assembly Moisture Management via Segmented Absorption Body
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Solution Overview
Problem
Existing sensor arrangements face challenges in preventing moisture ingress due to non-diffusion-tight plastic housings, which can compromise the protection of sensitive electronics, especially in compact designs where the sensor is directly connected to the liquid environment.
Innovation Solution
A sensor arrangement featuring a housing made of plastic injection-molded parts with integrated absorption bodies designed as plastic injection molded parts, utilizing O-rings for sealing, and an absorption body that can absorb a significant amount of moisture, ensuring effective protection of electronics while allowing for efficient assembly and space utilization within the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a desiccant is incorporated inside the housing to absorb moisture, then moisture protection of electronics is improved, but the risk of mechanical or chemical impact on adjacent components increases
Solution Approach 1:
The housing is divided into two separate parts: the sensor housing containing electronics and the absorbent body housing containing the desiccant. This segmentation physically isolates the desiccant from direct contact with electronic components, eliminating the risk of mechanical or chemical damage while maintaining moisture absorption functionality.
Solution Approach 2:
A transparent lid acts as an intermediary barrier between the absorbent body and the sensor housing. This lid allows moisture to pass through to the desiccant while preventing direct contact between the absorbent material and electronic components, thus protecting both the electronics and maintaining moisture protection.
2Volume of moving object
If the housing volume is reduced for compact design, then space utilization is improved, but the capacity to bind penetrating liquid is reduced
Solution Approach 1:
The absorbent body is designed with a vertical orientation extending from the bottom of the sensor housing toward the lid, utilizing the vertical dimension efficiently. This allows maximum moisture absorption capacity within the limited horizontal footprint of the compact housing.
Solution Approach 2:
The absorbent body is designed as a flexible, moldable mass that can be customized to fit the specific geometry and volume constraints of the housing. This flexibility allows optimization of moisture binding capacity within the available space without requiring additional housing volume.
3Reliability
If different plastics with high diffusion resistance are used in the lid area, then moisture ingress is reduced, but the device complexity increases
Solution Approach 1:
The moisture protection function is extracted from the housing structure itself and transferred to a dedicated absorbent body. This allows the housing to use simpler, easier-to-manufacture plastics while the absorbent body handles moisture absorption, reducing overall device complexity.
Solution Approach 2:
The transparent lid serves as an intermediary layer that separates the sensor housing from the absorbent body. This lid can be made from standard transparent plastic while the moisture protection function is provided by the absorbent body behind it, simplifying the overall structure compared to using specialized diffusion-resistant plastics throughout.
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 binds and manages moisture within the sensor housing, providing reliable protection to the electronics, maintaining the integrity of the sensor arrangement even in environments where moisture is present, and simplifies assembly by integrating the absorption body with the housing components.
Implementation Method 1
an absorbent body (4) designed as a plastic injection molded part and intended to absorb and bind liquid
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The invention relates to a sensor assembly having at least one sensor (7) and a housing (1) which is constructed of two injection-moulded plastic parts (2, 3) and which protects sensor electronics arranged on a printed circuit board (5). An absorption body (4) is provided in the housing, said body being designed as an injection-moulded plastic part and being used to take up liquid which, for example, could enter the housing by diffusion.