Sensor Housing Enlarged Diameter Water Protection
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Solution Overview
Problem
Conventional sensor designs with built-in heaters are vulnerable to water exposure due to dew condensation or rain, leading to reduced heating efficiency and potential damage, as the existing protective cover shapes may not adequately prevent water from reaching the heater portion.
Innovation Solution
A sensor design featuring a housing with an enlarged diameter portion near the heater, positioned to increase the distance between the sensor element and the housing inner wall, and a protective cover that extends beyond the sensor element, combined with a tapered or rounded shape to direct water away from the heater, and optionally a porous protective layer for enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional housing with uniform diameter is used, then the structure is simple and easy to manufacture, but water can flow along the inner wall to the rear end and drip onto the heater portion
Solution Approach 1:
The housing incorporates an enlarged diameter portion with a curved or tapered shape that increases the distance between the inner wall and the sensor element in the rear end region. This curvature prevents water flowing along the inner wall from reaching the heater portion, while maintaining manufacturing feasibility through standard molding techniques.
2Object-affected harmful factors
If the distance between the sensor element and housing inner wall is increased to prevent water exposure, then water protection is improved, but the housing volume increases
Solution Approach 1:
The housing features a localized enlarged diameter portion only in the rear end region where water protection is critical, while the front end and other regions maintain their original dimensions. This localized approach provides water protection where needed without unnecessarily increasing the overall housing volume.
3Power
If the heater is positioned closer to the rear end to improve heating efficiency, then heating performance is improved, but water exposure risk increases
Solution Approach 1:
The enlarged diameter portion of the housing acts as an intermediary protective structure between the water environment and the heater. It creates a physical barrier that redirects water flow away from the heater portion, allowing the heater to be positioned optimally for heating efficiency without direct water exposure risk.
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
Effectively reduces the likelihood of water exposure to the heater portion, maintaining heating efficiency and preventing damage from water ingress, with improved protection provided by the specific housing geometry and protective cover configurations.
Implementation Method 1
a heater that includes a heat generation portion and a lead portion
Data Source
AI summary
The probability of a heater portion of a sensor element being exposed to water is lowered. The sensor element includes a built-in heater that extends in a longitudinal direction and a surrounding housing extending in the longitudinal direction. The heater includes a heat generation portion and a lead portion. The heat generation portion has a front end and a rear end, and is positioned on the same side as a front end portion side of the sensor element. The housing includes an enlarged diameter portion having a diameter of an inner wall that increases in a direction toward the front end of the sensor. The enlarged diameter portion includes a front end portion and a rear end portion. The rear end of the heat generation portion is located closer to the front end of the sensor than the rear end portion of the enlarged diameter portion is.