Fire doors, a commonly used fire product, play a very important role in preventing the spread of fire and smoke, and ensuring the safe evacuation of personnel.
1. Normally open fire doors should be used for fire doors located on two fire compartments and on evacuation walkways with a large flow of people. Professional architects should clearly mark them when making design drawings. For normally open fire doors, one release and one single linkage module are equipped for single leaf, and two releases and two single linkage modules are equipped for double leaf. When the smoke (temperature) sensor on either side of the fire door detects smoke (or temperature), it will report it to the fire alarm controller via the bus. The linkage controller will issue an action command according to the pre-set program, and the single linkage module will accept it. After the command is reached, the passive normally open contact of the module is closed and the coil circuit of the release switch is turned on. The coil is instantly energized to release the fire door. The fire door is automatically closed by the force of the door closer. The coil circuit is separated from the release switch due to the fire door. It is automatically cut off, and at the same time, the auxiliary contact of the release device inputs the status signal of the fire door 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 to close the fire door through the bus and get the confirmation signal that the fire door is closed. Finally, the reliable closing of the fire door is achieved.
2. For the selection of door closers, the weight and width of the fire door and the closing torque of the door closer should be considered comprehensively, and products with a higher level should be selected as far as possible. During installation and commissioning, the door closing torque must be consciously adjusted to a larger state to ensure the reliable closure of the fire door and achieve the functions of fire prevention and smoke prevention.
3. In special locations, such as: there is a positive pressure air supply facility in the smoke-proof stairwell, which may affect the establishment of the positive pressure of the smoke-proof system, add another electric closing device, which can be linked with the opening of the smoke exhaust fan. The device does not affect the opening of the fire door during emergency evacuation, and can work together with the door closer to ensure the reliable closing of the fire door.
4. For the evacuation walkway, when the owner has the anti-theft function of the normally closed fire door, it is recommended to use a female (yang) electromagnetic lock and a linkage module to achieve the reliability of self-closing. The yin (yang) electromagnetic lock usually locks the normally closed fire door, and requires a key to pass, so as to achieve the effect of security and anti-theft; in the event of a fire, the fire control room duty officer manually controls the linkage module through the alarm bus to make the electromagnetic When the lock is opened, it is in a state of normally open. At the same time, the unlock confirmation signal is fed back to the fire control room, and the evacuated personnel can push open the fire door to escape in an emergency, so as to achieve the purpose of combining fire protection and security.
5. When the project is accepted, it is recommended to add an inspection and acceptance of the door frame and door leaf sealing contact reliability of the self-closing fire door, that is, to check the degree of reliable contact between the door leaf and the door frame sealing strip. When necessary, a contact feedback device can be installed to ensure the reliable closing of the fire door.
