Gas Concentration Sensor Double-Layer Cover Aperture Ratio
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Solution Overview
Problem
Gas concentration detection sensors with double-layered protective covers face issues with insufficient response property and water adhesion to the sensor element, leading to increased response time and potential cooling of the sensor.
Innovation Solution
A gas concentration detection sensor design featuring a double-layered protective cover with a specific ratio of outer to inner gas aperture diameters (φ1/φ2 between 0.6 and 0.9) to enhance response time and prevent water adhesion, where the inner diameter of the outer cover is preferably equal to or slightly larger than the housing diameter, optimizing gas flow and reducing water striking the sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a double-layered protective cover is used to protect the sensor element, then the sensor element is protected from water adhesion and cooling, but the response property of sensor output becomes insufficient and response time increases
Solution Approach 1:
The patent applies parameter changes by optimizing the ratio of the outer diameter of the inner gas aperture (φ1) to the inner diameter of the outer gas aperture (φ2) within the range of 0.6 to 0.9. This parameter optimization allows the double-layered protective cover to maintain both protection functionality and fast response time by controlling gas flow characteristics through the apertures.
Solution Approach 2:
The patent applies local quality by creating different aperture configurations in the inner and outer covers. The inner cover has gas apertures with a specific outer diameter φ1, while the outer cover has gas apertures with inner diameter φ2, where the ratio φ1/φ2 is optimized. This local structural differentiation enables selective gas flow control that maintains response performance while providing protection.
2Loss of time
If the ratio φ1/φ2 is increased to improve response property, then response time decreases, but water may still flow into the protective cover and adhere to the sensor element
Solution Approach 1:
The patent uses parameter changes by establishing the optimal ratio range of φ1/φ2 between 0.6 and 0.9. This parameter range simultaneously achieves two objectives: minimizing response time (improving response property) and preventing water from flowing into the protective cover and adhering to the sensor element.
Solution Approach 2:
The patent applies the intermediary principle by using the double-layered protective cover structure with optimized aperture ratios as a mediator between the external environment and the sensor element. This intermediary structure controls water flow and gas flow separately, allowing gas to reach the sensor quickly while blocking water adhesion.
3Productivity
If the inner diameter of the outer cover is increased to maximize gas flow, then response property improves, but the protective cover may not adequately protect the sensor element
Solution Approach 1:
The patent applies parameter changes by optimizing the inner diameter of the outer cover (φ2) relative to the housing diameter and establishing the ratio φ1/φ2 between 0.6 and 0.9. This parameter optimization ensures maximum gas flow rate for improved response property while maintaining adequate protection effectiveness of the double-layered cover.
Solution Approach 2:
The patent applies universality by designing the outer cover to serve multiple functions simultaneously: it provides protection for the sensor element, controls gas flow rate for fast response, and works in conjunction with the inner cover to prevent water adhesion. The optimized dimensions enable the structure to fulfill multiple functions effectively.
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 optimized design significantly improves the response property of the sensor output and effectively prevents water adhesion to the sensor element, achieving minimal response time within the specified ratio range.
Implementation Method 1
a ratio φ1/φ2 is from 0.6 to 0.9 where φ1 represents an outer diameter of a portion where the inner gas aperture is formed in the inner cover and φ2 represents an inner diameter of a portion where the outer gas aperture is formed in the outer cover
Data Source
AI summary
The sensor element, which can detect the concentration of a specified gas, is held with a housing with a front end thereof exposed. A protective cover includes an inner cover and an outer cover, and secured to the housing. A ratio φ1/φ2 is set to a range from 0.6 to 0.9, where φ1 represents an outer diameter of a portion where an inner gas aperture is formed in the inner cover, and φ2 represents an inner diameter of a portion where an outer gas aperture is formed in the outer cover.