Gas Sensor Cover Design for Water-Proofing and Response Speed
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Solution Overview
Problem
Existing gas sensors face challenges in maintaining high responsiveness and preventing water-drop adhesion to the gas sensor element, as the design often compromises between water-proof capability and response speed, leading to issues with water-drop invasion and adhesion during low-speed engine operations.
Innovation Solution
A gas sensor design featuring a cylindrical cover body with a concentric configuration of inner and outer covers, including side surface and bottom surface openings that generate specific gas flow streams to prevent water-drop invasion and enhance responsiveness, with features like tapered parts and concave sections to optimize gas flow and pressure differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the cover body is designed with a simple structure to ensure high responsiveness, then the response speed is improved, but the water-proof capability deteriorates and water-drops can adhere to the gas sensor element
Solution Approach 1:
The cover body is divided into an inner cover and an outer cover with a gap between them. This segmentation allows the exhaust gas to flow through the gap before reaching the gas sensor element, creating a buffer zone that prevents direct contact with water-drops while maintaining rapid gas delivery to the sensor.
Solution Approach 2:
The gap between the inner and outer covers acts as an intermediary space. Exhaust gas must pass through this gap to reach the gas sensor element, which serves as a protective barrier that filters out water-drops while allowing the gas flow to maintain high responsiveness.
2Object-affected harmful factors
If the cover body is designed with enhanced water-proof capability to prevent water-drop adhesion, then the protection against water-drops is improved, but the responsiveness deteriorates due to increased flow resistance
Solution Approach 1:
The opening parts are strategically positioned at specific locations on the inner and outer covers. The inner cover has opening parts that face upward to repel water-drops, while the outer cover has opening parts that allow efficient gas intake. This local optimization ensures both water-proof capability and high responsiveness without compromising either function.
Solution Approach 2:
The protective function is achieved by adding a spatial dimension - the gap between inner and outer covers - rather than relying solely on a solid barrier. This three-dimensional configuration allows gas flow through multiple paths while maintaining water-repelling geometry at critical interfaces.
3Object-affected harmful factors
If the gap between inner and outer covers is reduced to improve water-proof capability, then water-drop protection is enhanced, but the gas flow resistance increases and responsiveness decreases
Solution Approach 1:
The gap width is optimized to a specific range that balances water-proof capability and gas flow. By carefully controlling this dimensional parameter, the design achieves sufficient water-repelling effect while maintaining low flow resistance and high responsiveness for rapid gas detection.
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 design achieves superior water-proof capability and responsiveness, effectively preventing water-drop adhesion while maintaining high frequency response, even during low-speed engine operations.
Implementation Method 1
side surface opening parts through which the measuring gases are introduced into the side surface gap... generate specific gas flow streams to prevent water-drop invasion
Implementation Method 2
bottom surface opening parts... generate an upward stream of measuring gas flow toward the side surface opening parts
Implementation Method 3
concentric configuration of inner and outer covers, including side surface and bottom surface openings that generate specific gas flow streams to prevent water-drop invasion and enhance responsiveness, with features like tapered parts and concave sections to optimize gas flow and pressure differences
Data Source
AI summary
A gas sensor has a sensor element detecting a concentration of a specified gas, a housing fixing this element to a gas pipe to expose it to measuring-gas flow, and cylindrical inner and outer covers of a different radius, configured in concentric configuration, having a base part. Side surface openings are formed in the inner cover so that each opening turns upward from the outside to the inside of the inner cover. Openings are formed in the bottom surface of the inner cover around a circle in concentric with the inner cover. Openings are formed in the side surface of the outer cover through which the measuring gases are introduced into a gap between the inner and outer covers. A gap is formed between bottom surfaces of both the covers. An opening is formed at the center of the bottom surface of the outer cover.