Electrically Isolating Block for Rail Tie Ducts

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Solution Overview

Problem

Existing rail tie duct heating systems in northern climates face issues with electrical isolation from track rails, leading to potential short circuits and false alarms, and current solutions using rubber gaskets are prone to failure due to vibration and weathering.

Innovation Solution

An electrically isolating block made of nonconductive material, such as ultrahigh molecular weight polyethylene, with embedded threaded fasteners, which connects tie ducts and provides structural support, eliminating the need for gaskets and preventing electrical conduction between rails.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If rubber gaskets are used to electrically isolate the duct from the track, then electrical isolation is achieved, but assembly and disassembly become complicated and the gaskets are prone to failure due to vibration and weathering

Engineering Contradiction:

Improveelectrical isolation reliabilityVSAvoidassembly complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the electrical isolation function with the structural support function into a single integrated block. The nonconductive block serves both to electrically isolate the duct from the track and to provide structural support for the duct system, eliminating the need for separate gaskets and simplifying assembly.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The nonconductive block acts as an intermediary element between the duct and the track, providing electrical isolation while also serving as a structural connector. This intermediary component resolves the contradiction by offering a single solution that addresses both electrical isolation and structural support needs.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If rubber gaskets are used to electrically isolate the duct from the track, then electrical isolation is achieved, but the gaskets are prone to failure due to vibration and weathering

Engineering Contradiction:

Improveelectrical isolation reliabilityVSAvoidservice life of isolation material

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent changes the material parameter from rubber (organic polymer) to thermoplastic material (synthetic polymer with superior environmental resistance). This parameter change provides better resistance to vibration, weathering, and temperature extremes, extending the service life of the electrical isolation component.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The use of thermoplastic material represents a composite solution that integrates multiple desirable properties: electrical nonconduction, mechanical strength, vibration resistance, and weathering resistance. This composite material approach resolves the contradiction between achieving reliable electrical isolation and ensuring long-term durability.

Inventive Principle:

Principle #40Composite materials

3Reliability

If traditional gasket-based isolation is used, then electrical isolation is provided, but maintenance becomes more complicated

Engineering Contradiction:

Improveelectrical isolationVSAvoidmaintenance ease

Core Design Contradiction:

ReliabilityVSEase of repair

Solution Approach 1:

By merging the electrical isolation function with the structural support function into a single block, the patent eliminates multiple components that would need to be maintained separately. The integrated design simplifies maintenance procedures while maintaining reliable electrical isolation.

Inventive Principle:

Principle #5Merging (Combining)

4Reliability

If the duct is electrically isolated from the track, then short circuits are prevented, but the isolation component must withstand structural loads

Engineering Contradiction:

Improveshort circuit preventionVSAvoidstructural strength of isolation block

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent changes the material parameters by selecting thermoplastic materials with high mechanical strength and stiffness. This parameter change enables the isolation block to simultaneously provide electrical nonconduction and withstand structural loads from the duct system.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The thermoplastic material serves as a composite solution that integrates electrical nonconduction with high mechanical strength. This composite material approach resolves the contradiction between preventing short circuits and withstanding structural loads.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS10634269B2Electrically isolating block and flange for rail-heating duct

Publication Date: 2020.04.28 THERMON CANADA INC

AI summary

An electrically isolating duct-connecting block for connecting two ducts, the duct-connecting block including a rigid, generally rectangular duct-like structure having upper and lower walls and side walls that match a cross-sectional size of a tie duct, the structure being made of an electrically nonconductive material. The block also includes a plurality of threaded fasteners embedded within the structure. Also disclosed is an electrically isolating nozzle-mounting block for mounting a nozzle to a tie duct, the nozzle-mounting block comprising a rigid flange-like structure having peripheral mounting holes and a central circular passage for conveying air to the nozzle, the structure being made of an electrically nonconductive material. The block also includes a plurality of threaded fasteners partially embedded within the structure. The blocks may be made of ultrahigh molecular weight polyethylene or any electrically and mechanically equivalent material.