Eddy Current Probe Sealing Against Liquid Leakage
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Solution Overview
Problem
Eddy current inspection devices face issues with pressurized liquid leakage into the tip assembly and probe cable during inspections in pressurized liquid environments, which can damage the sensing coil and affect measurement accuracy.
Innovation Solution
The use of multiple O-ring seals and a swage-type fitting to sealingly couple the tip assemblies and probe case, preventing liquid leakage into the cavity of the eddy current inspection device, ensuring effective sealing in pressurized environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single O-ring seal is used at the interface between tip assembly and probe case, then the device structure remains simple, but liquid leakage occurs in pressurized environments
Solution Approach 1:
The patent divides the sealing system into multiple segments: a first O-ring seal at the probe case interface, a second O-ring seal at the first tip assembly interface, and a third O-ring seal at the second tip assembly interface. This segmentation allows each seal to independently prevent leakage at specific locations, achieving reliable sealing in pressurized environments without requiring a single complex seal design
Solution Approach 2:
The patent transitions from a single-point sealing approach to a multi-dimensional sealing strategy by positioning seals at multiple interfaces along the probe structure. This creates redundant sealing barriers that prevent liquid ingress even when one seal is compromised, resolving the contradiction between sealing reliability and structural simplicity
2Adaptability or versatility
If multiple tip assemblies are used within the probe cavity, then inspection capability is enhanced, but the risk of liquid infiltration and damage to sensing coils increases
Solution Approach 1:
The patent implements a nested sealing architecture where tip assemblies are positioned within the probe cavity and each interface between components is sealed with dedicated O-ring seals. The first tip assembly is sealed to the probe case, the second tip assembly is sealed to the first tip assembly, creating nested protective barriers that prevent liquid infiltration while accommodating multiple sensing elements for enhanced inspection capability
Solution Approach 2:
The patent applies beforehand cushioning by pre-positioning multiple sealing barriers at potential leakage points before pressurized liquid can infiltrate the probe cavity. The sequential arrangement of O-ring seals at each interface creates preventive protection that stops liquid ingress before it can reach and damage the sensing coils, enabling safe use of multiple tip assemblies
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 solution effectively prevents liquid leakage, protecting the sensing coil and maintaining measurement accuracy in pressurized environments, such as underwater applications, while allowing for reliable inspection of rotating machinery components.
Implementation Method 1
known EC devices include a sensing coil that generates a magnetic field. When the sensing coil is positioned adjacent to a conductive component, an eddy current is generated on the surface of the component
Implementation Method 2
an eddy current is generated on the surface of the component. A flaw on and/or near the surface of the component generates a disruption in the eddy current field
Implementation Method 3
multiple O-ring seals and a swage-type fitting to sealingly couple the tip assemblies and probe case, preventing liquid leakage into the cavity
Data Source
AI summary
A method for assembling an eddy current inspection device includes at least partially positioning a first tip assembly within a cavity defined by a proximity probe case. The first tip assembly defines a bore therethrough. The first tip assembly is sealingly coupling to the proximity probe case. A second tip assembly is at least partially positioned within the cavity and sealingly coupled to the first tip assembly.