Hermetic Terminal Space Reduces Parasitic Capacitance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Sensor units used in high-pressure and explosive environments face challenges in resisting noise and maintaining accurate measurements due to high parasitic capacitance and pressure stress, which are not adequately addressed by existing hermetic terminals.
Innovation Solution
The proposed hermetic terminal design includes a barrier wall and a body connected to signal ground via insulators, creating a space between the housing and the signal line to reduce parasitic capacitance and stress on insulators, allowing for improved noise resistance and compliance with explosion-proof standards while maintaining resistance to high pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the hermetic terminal is designed with a compact structure to reduce size, then device complexity is reduced, but parasitic capacitance between the housing and signal line increases, worsening noise resistance
Solution Approach 1:
The patent introduces a space dimension between the housing inner wall and the signal line by positioning the body away from the housing inner wall. This spatial separation in the radial dimension reduces parasitic capacitance without significantly increasing overall device complexity, as the space is formed by the natural arrangement of components rather than adding extra structural elements.
2Reliability
If the hermetic terminal is designed with close coupling between housing and signal line to improve mechanical stability, then reliability is improved, but parasitic capacitance increases, worsening noise resistance
Solution Approach 1:
The patent segments the hermetic terminal into distinct functional parts: the housing, the barrier wall, the body, and the signal line. By separating the signal line (through the body) from the housing inner wall with a defined space, the design achieves both mechanical stability through proper component fixation and reduced parasitic capacitance through spatial separation.
3Productivity
If the insulator is positioned close to the housing to reduce overall terminal length, then productivity is improved, but stress on the insulator increases, worsening fracture endurance
Solution Approach 1:
The barrier wall acts as an intermediary element between the housing and the body. It provides a mounting surface for the body while maintaining a space between the body and the housing inner wall. This intermediary structure distributes and reduces the stress on the insulator that fixes the signal line to the body, improving fracture endurance without compromising manufacturing efficiency.
4Reliability
If the hermetic terminal is designed to meet explosion-proof standards with increased clearance, then safety is improved, but device complexity increases, worsening ease of manufacture
Solution Approach 1:
The body serves multiple functions: it provides electrical insulation between the signal line and housing, creates the required clearance space for explosion-proof compliance, and acts as a mounting structure for the signal line. This multi-functionality achieves safety requirements without significantly increasing device complexity, as the same component fulfills multiple roles.
Data Source
AI summary
A hermetic terminal (110) includes a barrier wall (12) to be joined to a housing (11), a body (15) that is to be connected to a signal ground and is fixed to the barrier wall (12) via a first insulator (13), and a signal line (16) passing through the body (15) and fixed to the body (15) via a second insulator (14). When the barrier wall (12) is joined to the housing (11), a space (28) is formed between an inner wall of the housing (11) and a surface (31) of the body (15) intersecting an end face (29) of the body (15) positioned towards the inside of the housing (11).