Elevator Landing Doorway Frame Heat Insulation
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Solution Overview
Problem
Conventional elevator landing doorway frames can transfer heat from a fire in the landing area to the hoistway, posing a risk of fire to devices within the hoistway.
Innovation Solution
A landing doorway device with a tubular vertical frame and heat-insulating material applied to the hoistway-facing portion to prevent heat transfer from the landing doorway-facing portion to the interior of the hoistway, using materials like rock wool or silica heat-insulating materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat-insulating material is provided only on the door panel, then door heat insulation is improved, but the landing doorway frame still transfers heat to the hoistway
Solution Approach 1:
The patent applies heat-insulating materials specifically to the landing doorway frame components that are most susceptible to heat transfer, particularly the vertical frames and horizontal beams facing the landing. This localized application addresses the specific heat transfer pathway from the landing to the hoistway without requiring insulation of the entire frame structure, thereby resolving the contradiction between targeted temperature control and comprehensive heat protection.
Solution Approach 2:
The patent employs composite construction by combining the metallic frame structure with heat-insulating materials (such as mineral wool, foam, or ceramic coatings) applied to the frame surfaces. This composite approach maintains the structural integrity and strength of the metal frame while adding thermal insulation properties, thus preventing heat transfer to the hoistway without compromising the frame's mechanical function.
2Strength
If the landing doorway frame is used for structural support, then structural strength is improved, but heat transfer to the hoistway increases
Solution Approach 1:
The patent employs composite construction by combining the metallic frame structure with heat-insulating materials (such as mineral wool, foam, or ceramic coatings) applied to the frame surfaces. This composite approach maintains the structural integrity and strength of the metal frame while adding thermal insulation properties, thus preventing heat transfer to the hoistway without compromising the frame's mechanical function.
Solution Approach 2:
The patent divides the landing doorway frame into functional zones: structural components that provide support and insulation components that prevent heat transfer. The insulation materials are applied as separate layers or integrated as distinct elements within the frame structure, allowing independent optimization of both structural strength and thermal insulation properties.
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
Effectively prevents the transfer of heat from the landing doorway to the hoistway, reducing the risk of fire in the hoistway and maintaining a lower temperature distribution within the vertical frame.
Implementation Method 1
a vertical frame heat-insulating material provided to the hoistway-facing portion, for preventing heat conducted from the landing doorway-facing portion to the hoistway-facing portion from being transferred to the interior of the hoistway
Data Source
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AI summary
A landing doorway device for an elevator includes a tubular vertical frame provided to a side portion of a landing doorway, the tubular vertical frame including a landing doorway-facing portion facing the landing doorway and a hoistway-facing portion facing an interior of a hoistway. A vertical frame heat-insulating material is provided to the hoistway-facing portion, for preventing heat conducted from the landing doorway-facing portion to the hoistway-facing portion from being transferred to the interior of the hoistway.