Elevator Door Panel Fire Ejection Mechanism
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Solution Overview
Problem
Elevator systems face challenges in ensuring high safety standards, particularly in fire situations, due to the integration of operating and display panels in door leaves which can be combustible.
Innovation Solution
The integration of an ejection device within the door leaf of elevator systems, which can partially remove the operating and display panel in the event of a fire, utilizing materials like intumescent material or actuators with preloaded springs to enhance fire safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an operating and display panel is integrated in the door leaf, then functionality and user interface are improved, but fire safety deteriorates due to combustible materials
Solution Approach 1:
The door leaf is divided into separable parts: the operating and display panel can be partially or completely removed from the door leaf using an ejection device when fire is detected, while the door leaf structure remains intact. This segmentation allows the combustible panel to be separated from the non-combustible door leaf.
Solution Approach 2:
The operating and display panel, which contains combustible materials, is extracted or removed from the door leaf structure using an ejection device activated by heat or smoke detection. This extraction eliminates the fire hazard while preserving the door leaf's fire-resistant properties.
2Ease of manufacture
If combustible materials are used in the operating panel, then manufacturing cost and ease of manufacture are improved, but fire resistance deteriorates
Solution Approach 1:
An ejection device is pre-installed in the door leaf that can automatically activate when fire conditions are detected. This preliminary action mechanism ensures that combustible materials are rapidly removed from the door leaf before they can contribute to fire spread, maintaining fire resistance despite using inexpensive combustible materials in the panel.
3Strength
If the operating panel is permanently fixed in the door leaf, then structural integrity is improved, but fire safety deteriorates
Solution Approach 1:
The connection between the operating panel and door leaf is made dynamic rather than static. The ejection device enables the panel to transition from a fixed state during normal operation to a removed state during fire events. This dynamic capability maintains structural integrity when needed while eliminating fire hazards when necessary.
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 solution significantly enhances fire safety by allowing combustible parts of the operating and display panel to be safely removed, thereby increasing the door leaf's ability to withstand higher temperatures during a fire.
Implementation Method 1
utilizing materials like intumescent material or actuators with preloaded springs
Implementation Method 2
The actuator housing consists, for example, of a plastic material which melts in the event of a fire and thus releases the spring for generating a spring force
Implementation Method 3
The actuator housing consists, for example, of a plastic material which melts in the event of a fire and thus releases the spring for generating a spring force
Data Source
AI summary
A landing door of an elevator system includes a door leaf that is equipped with an integrated operating and/or display panel. In the event of a fire, a printed circuit board of the operating and/or display panel is removed from the door leaf by activation of an ejection device comprising intumescent material and being positioned in the door leaf.