Door device with pressure difference mitigating mechanism
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Solution Overview
Problem
Existing fire door pressure difference mitigating mechanisms require additional force to open after pressure difference is mitigated, and operability is poor, especially for vulnerable individuals, and self-closing becomes difficult due to reverse closing forces.
Innovation Solution
A fire door is divided into two parts, a hanging door and a door-end door, with specific latch and hinge configurations that allow integral operation in normal conditions and automatic opening of the door-end door to reduce opening force during pressure differences, while ensuring self-closing functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a pressure difference mitigating mechanism is provided at the opening portion of a fire door, then the pressure difference can be eliminated to facilitate evacuation, but the mechanism requires additional force to open after pressure difference is mitigated and operability becomes poor
Solution Approach 1:
The door is divided into two separate parts: a main door and a door-end door with the opening portion. The pressure difference mitigating mechanism is specifically provided at the door-end door, separating the pressure relief function from the main door structure. This segmentation allows the mechanism to operate independently without affecting the overall door integrity, and the door-end door can be opened separately to relieve pressure before opening the main door for evacuation.
2Reliability
If the door is divided into two parts with a door-end door, then automatic self-closing can be achieved, but the hinge closer creates additional resistance that opposes the automatic closing force
Solution Approach 1:
The hinge closer is configured to provide a closing force that acts in opposition to the door-end door opening force. This counterbalancing mechanism ensures that when the pressure difference is relieved and the door-end door opens, the hinge closer automatically pushes it back to the closed position. The opposing forces are carefully balanced so that the self-closing function is reliable without creating excessive resistance during normal operation.
3Adaptability or versatility
If a movable body is rotatably fixed by an eccentric rotating shaft, then the movable body can be opened by pressure difference, but the structure becomes complex and manufacturing becomes difficult
Solution Approach 1:
The pressure difference mitigating mechanism is extracted as a separate, dedicated component at the door-end door rather than being integrated into the main door structure. This extraction allows for simplified manufacturing of each component independently, while still achieving the adaptive function of automatic opening when pressure difference occurs. The door-end door with its separate mechanism can be manufactured and installed independently from the main door.
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 enhances operability by allowing easy manual opening and automatic self-closing of the door-end door during pressure differences, improving safety and accessibility for evacuation, especially for vulnerable individuals.
Implementation Method 1
a hinge closer which pivotally supports the door-end door with respect to the hanging door and has a closing force in a closing direction
Data Source
AI summary
A door is formed into a folding door by dividing the door into two parts to left and right, that is, a hanging door and a door-end door pivotally supported by the hanging door, and the door-end door is used as the pressure difference mitigating mechanism, and the two doors are integrally operated in a normal time, while if a pressure difference is generated, the door-end door can be first opened in order to reduce an opening force, and the door device with a pressure difference mitigating mechanism with excellent operability is provided.A handle position, a latch position, and a torque are adjusted for a handle for door opening/closing, a door closer, a hinge closer for rotating the door-end door with respect to the hanging door, a latch A of the door-end door to a door frame, and a latch B of the door-end door to the hanging door.