Rail Switch Heating Insulation Reducing Heat Loss
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Solution Overview
Problem
Existing rail switch heating systems experience significant heat losses due to the intermediate space between mounting plates and the rail foot, which allows cold air and snow to penetrate, reducing the efficiency of heat transfer.
Innovation Solution
The implementation of thermally insulating materials, such as EPP or EPS, are strategically placed against the lower and side surfaces of the rail foot and web, extending between mounting plates to prevent heat radiation and direct contact with cold air and snow, while also incorporating a mass spring system for noise reduction using a denser sub-body within the insulation material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heating elements are placed against the rail to heat the rail, then the rail temperature is increased, but heat losses occur through the intermediate space between mounting plates and the rail foot
Solution Approach 1:
The thermal insulation is divided into two separate bodies: a first body positioned against the lower surface of the rail foot, and a second body positioned against the side surface of the rail web. This segmentation allows each insulation body to be optimally positioned to block specific heat loss paths without interfering with mounting plate attachment and rail functionality.
Solution Approach 2:
Thermal insulation material is introduced as an intermediary substance between the heating element/rail and the cold environment (intermediate space). This insulation material acts as a thermal barrier, mediating the heat transfer process by reducing conductive and radiative heat losses to the cold air and snow in the intermediate space.
2Device complexity
If the intermediate space is left open between mounting plates, then the structure remains simple and accessible, but cold air and snow can penetrate causing heat losses
Solution Approach 1:
The thermal insulation is applied locally at the rail foot and web areas where heat losses occur, rather than insulating the entire rail structure. This localized approach blocks cold air and snow penetration at the critical points without requiring complex structural modifications to the mounting plates or rail assembly.
Solution Approach 2:
The thermal insulation bodies are made from cost-effective materials such as expanded polypropylene (EPP), expanded polystyrene (EPS), or similar foamed materials. These relatively inexpensive insulation elements can be easily installed and replaced if necessary, providing an economical solution to protect against environmental factors without complex engineering.
3Loss of energy
If thermally insulating material is placed against the rail foot and web, then heat losses are reduced, but the device complexity increases
Solution Approach 1:
The insulation system is segmented into two separate bodies positioned at different locations: the first body against the rail foot lower surface and the second body against the rail web side surface. This segmentation allows for simplified installation and positioning of each component without requiring complex integrated structures, reducing overall device complexity while maintaining effective heat loss reduction.
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
This configuration significantly reduces heat losses and noise by effectively insulating the rail and incorporating a mass spring system for sound damping, enhancing the overall performance of the rail switch assembly.
Implementation Method 1
at least one rail is provided with a first body of thermally insulating material, that has been arranged against at least a part of the lower surface of the foot of said rail and in longitudinal direction extends at least partially between the mounting plates/slide plates for said rail
Implementation Method 2
the portion in question of the lower surface of the foot is not only insulated against emission of heat by radiation
Implementation Method 3
incorporating a mass spring system for noise reduction using a denser sub-body within the insulation material
Implementation Method 4
The first and optionally the second body can be arranged on the rail that has also been provided with a heating element
Data Source
Figure 1~2B
Figure 3A~3B
Figure 3C~3D
AI summary
Rail switch assembly having pairs of rails and a basis therefor, wherein each pair of rails comprises a fixed rail and a movable rail or switch tongue, wherein at regular intervals mounting plates/slide plates have been provided for supporting the rails and forming a slide surface for the switch tongues, wherein the rails each comprise a foot and a web extending upwards from the foot, wherein the foot has an upper surface and a lower surface and the web has a first side surface and a second side surface opposite thereto, comprising a heating means for at least one rail of at least one pair of rails, for instance a heating element extending alongside it that has been placed against one or more of the said surfaces, wherein of said pair of rails at least one of both rails has been provided with a first body of thermally insulating material, that has been arranged against at least a part of the lower surface of the foot of said rail and in longitudinal direction extends at least partially between the mounting plates/slide plates for said rail.