Coaxial Video Push-Cable Composite Core Design
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Solution Overview
Problem
Conventional video push-cables for pipe inspection systems face difficulties in deployment and retraction, and they often cause issues with signaling and power provision, especially when used with newer camera heads, due to their semi-rigid structure and lack of mechanical strength and flexibility.
Innovation Solution
A coaxial video push-cable design featuring a structural core, insulating dielectric layers, and an outer conductor array with high electrical conductivity materials, such as copper or silver, to provide enhanced strength, flexibility, and efficient power and signaling transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a semi-rigid video push-cable with filler rods and conductors wound around a central push-rod is used, then the cable provides mechanical strength to deploy a considerable distance, but the cable becomes difficult to deploy or retract and causes problems with signaling and power provision
Solution Approach 1:
The patent applies composite materials by combining a semi-rigid central push-rod made of composite material (such as fiberglass) with flexible conductor elements. The central push-rod provides the necessary stiffness and strength to deploy the cable a considerable distance, while the flexible conductors are positioned to allow bending around sharp turns and facilitate easy deployment and retraction. This composite structure resolves the contradiction by integrating materials with different mechanical properties to achieve both strength and flexibility.
2Reliability
If conductors are positioned around or outside the central push-rod element, then power and signaling can be transmitted, but the conductors become difficult to terminate in the field when the push-cable breaks
Solution Approach 1:
The patent extracts the conductors from their traditional position around the central push-rod and repositions them as flexible elements that can be independently accessed and terminated. This extraction allows field technicians to easily connect or disconnect conductors at the camera head end without needing to access the central push-rod structure, significantly simplifying field repairs and terminations while maintaining reliable power and signaling transmission.
3Loss of energy
If conventional coaxial cable materials with low dielectric constants are used, then capacitive loss is minimized and target impedance is achieved with minimal diameter, but the cable lacks the elastic modulus, stiffness, and strength required of a push-cable
Solution Approach 1:
The patent resolves this contradiction by using composite materials for the central push-rod (such as fiberglass) that provide high elastic modulus and stiffness, while separately positioning flexible conductors that use appropriate dielectric materials to minimize capacitive loss. The composite structure allows the push-rod to provide mechanical strength without requiring the entire cable structure to be optimized for electrical properties, enabling both high strength and low energy loss to be achieved simultaneously.
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 coaxial video push-cable offers improved durability and performance by allowing deeper insertion into pipes while maintaining flexibility and enabling reliable power and signal transmission, reducing the need for frequent repairs and enhancing operational safety with AC power at higher frequencies.
Implementation Method 1
an insulating dielectric layer disposed around the inner conductor
Implementation Method 2
an outer conductor array with high electrical conductivity materials, such as copper or silver, to provide enhanced strength, flexibility, and efficient power and signaling transmission
Data Source
AI summary
Systems for inspecting pipes or cavities including a camera head, a coaxial push-cable, and a video signal transmitter and a communicatively coupled camera control unit (CCU) are disclosed.