Pressure-Resistant Feed-Through Maintaining Impedance
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Solution Overview
Problem
Existing high-pressure seals in level measurement devices often disrupt the electrical characteristic impedance, which is crucial for accurate measurements, especially in applications with pressure differences between the process and control sides.
Innovation Solution
A pressure-tight bushing with conical areas on the inner and outer conductors, along with a filling material, creates a form-fitting connection that maintains a constant electrical characteristic impedance, allowing for effective pressure isolation and signal transmission while withstanding pressure differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a pressure seal with cylindrical shape is used between inner conductor and outer conductor, then pressure resistance is improved, but electrical characteristic impedance changes
Solution Approach 1:
The patent applies parameter changes by transitioning from a cylindrical pressure seal geometry to a conical geometry. The conical shape with specific taper angles modifies the distribution of electrical fields and impedance characteristics along the transmission line, allowing the seal to maintain constant characteristic impedance while withstanding pressure differences between process and control sides.
Solution Approach 2:
The patent implements local quality by creating a form-fitting connection through conical areas that provide localized mechanical interlocking between the pressure seal and conductors. This localized geometric feature ensures both pressure resistance and electrical impedance control without affecting the entire structure uniformly.
2Ease of manufacture
If a non-positive connection is used between pressure seal and conductors, then ease of assembly is improved, but pressure resistance deteriorates
Solution Approach 1:
The patent uses conical surfaces (curved geometries) to create a form-fitting connection between the pressure seal and the conductors. The tapered conical areas enable mechanical interlocking that provides positive connection and enhanced pressure resistance, while still allowing for relatively simple assembly through the self-aligning nature of the conical geometry.
Data Source
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AI summary
The device (100) has a pressure-resistant duct (130) producing a connection between an inner conductor (110) and an outer conductor (120). The outer conductor includes a cylindrical region (195), which is attached to a conical region (180) of the outer conductor in a direction along longitudinal axis (160) of the device and has a reduced inner diameter than the conical region. A front surface (198) of the cylindrical region produces a form-fit connection with the duct so that a movement of the duct from a process side (140) to a control side (150) in the direction along the axis is prevented.