【 Weak current College 】 on fire doors automatic control problems

Senior civil building design fire protection standard of section 5.4.2 GB50045-95 stipulates for the evacuation of the aisle, staircase and vestibule of the fire door, should have its own shutdown functionality. Normally open fire doors, fire, should have its own closed and signal feedback function. This provision has been included in the 2000 construction provisions mandatory specifications (2002 Edition not included); the automatic fire alarm system design code GB50116-98 section 6.3.7: fire control device pair of fire door control, should meet the following requirements: 6.3.7.1 doors on either side of the fire detectors and alarm, fire doors should be closed automatically; 6.3.7.2 fire door closing signals should be sent to the fire control rooms.

Most senior civil construction works have always fire doors, but very few design implementation above specification. Participation of the author of fire alarm systems engineering construction units that haven't installed fire door control systems, had never heard of fire door release switch; alarm equipment factory sales reflect the design drawings very few design fire door control; construction projects or even advanced hotel normally open fire doors rarely set fire door release switch; it was fire door release switch manufacturers reflect: many cities there are very few people purchase fire door release switch. So I feel in small and medium-sized cities, the provisions of the above specifications are almost useless.

The specifications are not strict enough? apparently not, see the specification of the words you know. Is normally open fire doors in high-rise buildings rare? from the author of the following can be concluded that in fact is very common. The cost is too high? nor, fire door release switch of the ex-factory price is 350 Yuan/sets (import product prices to thousands), that is, they are more expensive than a probe! with electric fire shutter is almost even. What went wrong? we do?

A does not perform analysis specifications

First, the business of architecture design typically do not indicate which fan the fire doors are normally open from which fan is normally closed, electrical designers on architectural features and not too small and the analysis, thus ignoring the normally open fire door, which is the main reason.

Secondly, small electrical designer not familiar with the specification.

Once again, the automatic fire alarm equipment manufacturers generally do not produce fire door release switch, its product samples in the system example few columns automatically shuts down normally open fire door, have no detailed fire door control practices that designers are not familiar with design methods.

In addition, the domestic fire door release switch manufacturers propaganda is not enough, they tend to focus on fire doors, door closer, making electrical designers do not understand the product, is also an important reason.

Finally, some designers may misconceptions, on the understanding that normally open fire doors required fire curtain-like complex control, electric fire doors need motor to control that system like automatic door-like precision complex is expensive, it was also thought to be required to provide the strong electric power, and so on, thereby intentionally evaded mentality.
The second fire door use places and use analysis

Fire door press open into normally closed to the demands of fire doors and fire doors.

Normally closed doors do not usually need to provide automatic design of electrical engineering, but in some cases such as: evacuation channel normally closed doors when construction is intrusion management requirements (the news often report a units will fire evacuation channels are dead-lock for rectifications punishment, or a fire in the dead man, because the owners will fire evacuation channel lock personnel cannot escape death lead to tragedy, visible fire and security conflict this phenomenon very common) should be determined by the design of electrical professional match, despite the current fire code didn't do, but the designer's responsibility to help owners solve the contradiction between the fire and security issues.

For open doors, must be controlled by electrical professional design.

How to judge the fire doors are normally open? flow more evacuation channel fire door is usually always fire doors. For example: height over 32 m in the second category of high-rise building and a class shall be high-rise buildings, construction professional fire service lift often do the passenger elevator and elevator, and fire the elevator room and closed stairs (staircase or smoke) are often combined with front room, this situation is very common, large quantity does not exist in a large high-rise buildings. The combined with former Chamber and evacuation channels connected to the fire doors are standard normally open fire door, because the main flow shall be share through fire door to enter the room to take the lift. There are: size large skyscraper, evacuation channels on the role of fire compartment fire doors, usually a lot of people and goods are normally open fire doors.

Only the above two cases we can see that normally open fire doors generally exists in high-rise buildings.

If the normally open fire doors made of normal close don't control? I think absolutely not, because the fire door switch is to charge point world, and many feel extremely inconvenient (and fire doors and accessories will frequently switch collision life greatly reduced), often the door closer lever was removed from the exit, or fire door was fixed on the wall. When fire strikes everyone is competing for their lives, panic, who also remember to close the fire door? shut the even if it was cool, but this time the fire door may be fixed die hard to quickly close the door closer is destroyed by the fire door is lost behind closed doors, elastic, free door even if it's turned off, it will fire hot air expansion of impact, so common front room was swallowed up Fireworks, escape staircases with closed (or smoke staircase) is no longer safe, fire-fighting personnel cannot enter the elevator from fire e rescue fire before and so on, the consequences are very serious.

Therefore, the normally open fire doors will not normally closed.

Normally closed doors by fire door leaf, door frame, door closer, seal, etc, dual fan or fan of normally closed fire doors are equipped with sequencing.
The normally openFire door in addition to the normally closed all the parts of fire door, have to increase the fire door release switch.
Three fire door release switch works introduction

Fire door release switch (reference number: ZDK-905) weighs approximately 1Kg, overall dimensions 150 * 150 * 50, similar to 86 series switch panel, usually installed on the wall or self-made bracket, distance and height 1.5 meters installation practices are similar to ordinary wall switches, just dedicated terminal box, must be embedded because fire door release switch to withstand impact and outer door leaf uplift force.

Release switch panel has a notch, the fire door leaf with a set of small metal handle, small handle usually embedded fire door release switch of the Groove and withhold fire door release switch will fire door leaf, the door is open. Fire door release switch with a chain tension bolt, a product is a button, or press to manually release the small metal handle (emergency situations can also be forcibly pull door leaf), fire door door leaf rely on door closer role stretch and order with the door closed tight. Fire door release switch remain small metal handle retention in adjustable within 10 ~ 50Kg.

Fire door release switch often electromagnetic operation, power can be taken directly from linkage module of DC, 24V DC external power supply, operating current of less than 0.3A, power less than 0.5 seconds, fire door was released after the coil circuit is automatically cut off. Because of the fire door by linkage for smoke detectors, fire door closing more fan, so often small DC external power supply shocks, when a charged fire doors, external power supply you should increase the capacity.

Fire door release switch is a five-wire, two coil line three feedback signal lines, a normally closed a normally open contact reflect fire door working state.

Another fire door release switch selection with temperature control, temperature control of shape memory alloy do, when the ambient temperature of 70 ° c, temperature control element actions blocking pieces disengaged, fire door in the door closer elastic effect off. The principle is similar with the fire damper.

There is also a versatile product called Thermo electron double control fire door release switch (reference number: ZDK-902), Gu name Francis Yee.

The above described fire door release switch in the normal state is not powered on to maintain, and only when the linkage, instantaneous power, Jiangsu wujin AStar hutang, Shanghai is the class of products; another kind of fire door release switch normally must be connected to fire special power supply, electromagnet suction sucked the fire door, power, fire alarm linkage module by excision electro-magnet power to release the fire door, or you can manually control and feedback signals, such as the Nanchang ahlander magnetic door suck series products.

Four normally open fire door automatic control principle

For open doors, civil construction are generally single sector-hung door, fashion a fire door release switch and a single linkage module, dual fan fashion second fire door release switch and two single-linkage module.