Normally closed fire doors usually do not require electrical majors to provide automatic control design, but there are some situations such as: Normally closed fire doors on scattered channels, when there are management requests such as anti-theft to build a cube (news often reports that a unit locks the fire door on the scattered channel and is suspended from business, or someone died in a fire, the reason is that the owner can't escape the fire door lock personnel on the scattered passage and lead to a tragedy. It can be seen that the phenomenon of conflict between fire fighting and security is very common) it should be designed with the cooperation of electrical specialty, although there is no request for fire protection standards at present, the designers are obliged to assist the owners in dealing with the contradiction between fire protection and security.
Fire doors are divided into two types according to the open state: Normally closed fire doors and normally open fire doors.
Normally closed fire doors usually do not require electrical majors to provide automatic control design, but there are some situations such as: Normally closed fire doors on scattered channels, when there are management requests such as anti-theft to build a cube (news often reports that a unit locks the fire door on the scattered channel and is suspended from business, or someone died in a fire, the reason is that the owner can't escape the fire door lock personnel on the scattered passage and lead to a tragedy. It can be seen that the phenomenon of conflict between fire fighting and security is very common) it should be designed with the cooperation of electrical specialty, although there is no request for fire protection standards at present, the designers are obliged to assist the owners in dealing with the contradiction between fire protection and security.
As for normally open fire doors, the self-control design must be stopped by the electrical specialty.
How to judge whether the fire door is normally open? Fire doors on scattered channels with more people flow and logistics are usually normally open fire doors. For example, Class II high-rise buildings and Class I high-rise buildings with a height exceeding 32 meters must be equipped with fire elevators, and passenger elevators are often used as fire elevators by building majors, moreover, the front room of the elevator and the blocked staircase (or smoke-proof staircase) are often combined with the front room, which is very common and exists in a large number of high-rise buildings with small volume. The fire door connecting the combined front room and the dispersed channel is a standard normally open fire door, because the main stream of people must pass through the fire door to enter the combined front room to take the elevator. There are also: High-rise buildings with large volume, fire doors that play the role of fire partition on scattered passages, and there are also many ordinary people and logistics, which are often open fire doors.
As can be seen from the above two examples, normally open fire doors generally exist in high-rise buildings.
If you make the normally open fire door normally closed, don't you control it? I think it is absolutely impossible. Because the switch of the fire door costs a little effort, it is extremely inconvenient to enter and exit too much (and the life of the fire door and accessories will be greatly reduced due to frequent switch collision), it is often the door closer pull rod that is taken off and removed, or the fire door is fixed to the wall. When the fire fell, everyone rushed to escape. Who still remembered to close the fire door in the panic? Even if someone closes the door calmly, the fire door at this time may be fixed and difficult to close quickly, while the fire door destroyed by door closer loses the elasticity of the closed door. Even if the free door is closed, it is useless, it can't stand the impact force when the hot air flow in the fire contracts, so the shared front room will be submerged by fireworks, and the blocked staircase (or smoke-proof staircase) used for escape will no longer be safe, firefighters can't enter the front room from the fire elevator to save people and put out the fire, and the result is quite serious.
Therefore, the normally open fire door must not be normally closed to deal.
Normally closed fire doors generally consist of fire doors, door frames, door closer, sealing strips, etc. Double or multiple normally closed fire doors are also equipped with secondary devices.
In addition to all the accessories of the normally closed fire door, the normally open fire door release switch must be added.
