Pivot Door Smoke Seal with Retractable Bottom Edge
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Solution Overview
Problem
Conventional smoke protection doors with internal pivot pins lack a smoke-tight seal due to the interruption by pivot pins, making them ineffective in preventing smoke transfer between rooms during fires, and existing solutions are either impractical or aesthetically unappealing.
Innovation Solution
An extendable smoke protection seal is integrated along the lower and upper edges of the door leaf, extending continuously without interruption by the pivot pins, and automatically activates when the door is closed to seal gaps against smoke passage, using a triggering mechanism and restoring element for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pivot pins are arranged in the middle on the top and bottom of the door, then the door structure becomes simpler and more robust, but the smoke-tight seal is interrupted and smoke can pass through
Solution Approach 1:
The door seal is segmented into two functional parts: a fixed seal at the top edge and an extendable seal at the bottom edge. The extendable seal is divided into a stationary part and a movable part that can be extended or retracted independently, allowing the seal to adapt to the presence of pivot pins while maintaining smoke-tight closure.
Solution Approach 2:
The bottom seal is designed with dynamic characteristics, featuring an extendable component that can change its state between retracted and extended positions. This dynamic seal adapts to the door's operational state, remaining retracted during movement to avoid interference with pivot pins and extending during closure to ensure smoke-tight sealing.
2Device complexity
If a conventional seal is used on the lower or upper abutting surface, then the seal is simple in design, but it is interrupted by the pivot and cannot provide continuous smoke protection
Solution Approach 1:
The sealing system is segmented into fixed and extendable components, with the extendable seal at the bottom edge providing continuous coverage across the pivot pin area when extended, while the fixed top seal provides continuous coverage above the pivot pins.
Solution Approach 2:
The extendable seal acts as an intermediary element that bridges the gap created by the pivot pins. When extended, it provides a continuous sealing path across the bottom edge, compensating for the interruption caused by the pivot pin arrangement.
3Reliability
If extendable floor seals are used, then smoke protection can be achieved, but they can only be used on the narrow edge of hinged doors and construction becomes very difficult
Solution Approach 1:
The extendable seal device is designed with universal applicability, capable of being installed on both hinged doors and pivot doors. The seal can adapt to different door types and configurations, providing smoke protection in various applications without requiring specialized designs for each door type.
Solution Approach 2:
The dynamic extendable mechanism allows the seal to adapt to different door geometries and opening mechanisms. The seal can be positioned and extended appropriately for hinged doors with narrow edges or pivot doors with central pivot pins, making the solution versatile and easier to manufacture across different applications.
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 solution provides reliable smoke protection by ensuring continuous sealing across the door's width, maintaining the door's aesthetic integrity and operational simplicity while preventing smoke transfer effectively.
Implementation Method 1
the smoke protection seals are retracted by means of a restoring element as a function of the triggering element. If, for example, the door is opened, the triggering element is released and the smoke protection seals are retracted into the smoke protection devices by means of the return element
Data Source
Figure 1~4
Figure 5a~5b
AI summary
The present invention relates to a door 1, in particular for smoke control purposes to prevent the passage of smoke from a first to an adjacent second room, with a door leaf 2, the vertical pivot axis 3 of which is formed by pivot pins 4 projecting from the top and bottom of the door leaf 2, which are mounted in a pivot bearing 4a in the floor or in the horizontal part 4b of a frame, which is characterized in that a smoke control device 5a or 5b with a retractable smoke control seal 6 is arranged on the lower and upper edges of the front or back of the door on the door leaf 2.