Gas Sensor Insulator Protruding Edge Sealing
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Solution Overview
Problem
Existing gas sensors face challenges in enhancing the sealing effect between the insulator and the sensor element, which affects the accuracy and reliability of gas concentration measurements.
Innovation Solution
A gas sensor design that includes a sensor element, an insulator with an insertion hole and a concave portion, a sealing member disposed in the concave portion, and a housing with a retaining hole. The concave portion's opening edge portion protrudes more than surrounding areas, allowing for increased contact area between the sealing member and the insulator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing member is disposed in a concave portion to hold the sensor element to the insulator, then the sealing effect is improved, but the contact area between the sealing member and insulator is insufficient
Solution Approach 1:
The opening edge portion of the concave portion is given a different local quality by making it protrude more than other portions. This creates a localized region with enhanced sealing capability, where the protruding edge provides both sealing function and increased contact area with the sensor element, resolving the contradiction between sealing effect and contact area.
2Reliability
If the opening edge portion protrudes more than surrounding areas, then the contact area and sealing effect are improved, but the manufacturing complexity increases
Solution Approach 1:
The protruding opening edge portion is formed as a preliminary structural feature in the insulator before assembly. This pre-formed geometry ensures proper sealing contact during assembly without requiring additional complex manufacturing steps or adjustments, thereby maintaining ease of manufacture while achieving improved sealing effect.
Data Source
AI summary
A gas sensor has a sensor element measuring a gas concentration, an insulator holding the sensor element, a sealing member disposed in a concave portion of the insulator, and a housing holding the insulator. The concave portion of the insulator is communicated with an insertion hole through which the sensor element is inserted, and the sensor element is disposed in thereof. An opening edge portion in an inner bottom of the concave portion, which connects to the insertion hole, protrudes more than other portions surrounding the opening edge portion.