For normally open fire doors, civil buildings are generally swing doors, a single fire door release switch and a single linkage module, two fan fashion two fire door release switches and two single linkage modules. After the smoke probe on either side of the fire door detects the smoke, it reports to the fire alarm controller through the bus, and the linkage controller issues an action command according to the existing setting. The single linkage module dedicated to the fire door receives the command and the module is normally open. The contact is closed, the DC of the fire door release switch is turned on, the 24V coil circuit is turned on, and the coil is energized to release the fire door instantaneously; the fire door is automatically closed by the door closer elastic force, and the DC, 24V coil circuit is automatically cut off due to the fire door being released from the release switch. At the same time, the auxiliary contact of the fire door release switch inputs the fire door status signal into the single linkage module, and then sends it to the fire control room through the alarm bus. The fire control room can also directly control the on-site linkage module through the bus to close the fire door and get the confirmation feedback signal of the fire door closing.
The reset of the fire door must be manually powered by the fire door reset. After the reset, the fire door status signal will also be fed back to the fire control room.
There is also a normally open fire door that is not a swing door, called a fireproof sliding door (such as the product of Beijing New Fireproof Equipment Factory).
However, its working principle is: usually rely on the adsorption force of electromagnetic door suction to fix the fireproof sliding door in the normally open state. In the fire, the smoke probe transmits the detected signal to the smoke sensor switch, and the smoke sensor switch cuts off to the electromagnetic door. The power supply is sucked, the door is de-energized, the door is closed by its own weight, and the device can be self-contained or linked to the fire alarm system.
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