防火卷帘门按开启状态分为常闭防火门和常开防火门

　　防火卷帘门按开启状态分为常闭防火门和常开防火门。常闭防火门普通由防火门扇、门框、闭门器、密封条等组成，双扇或多扇常闭防火门还装有次第器。防火卷帘门通常不需求电气专业提供自控设计，但也有些特殊状况如：分散通道上的常闭防火门，当一些大型建筑方有防盗等管理上的要求时应由电气专业配合设计，尽可能全面的降低安全隐患。

　　The fire shutter doors are divided into normally closed fire doors and normally open fire doors according to the open state. Normally closed fire doors are usually composed of fire door fans, door frames, door closers, sealing strips, etc. Double or multiple normally closed fire doors are also equipped with secondary devices. Fire shutter doors usually do not require electrical professional to provide self-control design, but there are also some special conditions such as: normally closed fire doors on the dispersed channel. When some large buildings have administrative requirements such as anti-theft, they should be designed by electrical professional as comprehensive as possible. Reduce security risks.

　　而关于常开防火门，它是除具有常闭防火门的一切配件外，还须增加防火门释放开关，而且必需由电气专业提供自控设计。通常会在人流物流较多的分散通道上应用到。这两类的帘面与单板式钢质防火卷帘相同，前者在每节帘片的串接处中间加一根钻有小孔的薄壁钢管，在帘面二端设二根软橡胶与薄壁钢管相接。当火灾发作时，水经橡胶软管流人钢管内并从小孔渗漏出来，遇热汽化，吸收并带走帘片的热量，使之降温。后者是在帘片背火面侧设一钢管，在钢管上密密麻麻地钻上小孔，当发作火灾时，水经小孔射出洒在帘片上，逆流而下，吸热、蒸发，使帘片降温。

　　As for the normally open fire door, it is necessary to add a fire door release switch in addition to all the accessories with a normally closed fire door, and it must be provided by the electrical professional to provide a self-control design. It is usually applied to a dispersed channel with a large flow of people. These two types of curtains are the same as the single-plate steel fireproof roller blinds. The former adds a thin-walled steel pipe with small holes in the middle of each joint of the curtains, and two soft rubbers at the two ends of the curtain. It is connected to a thin-walled steel pipe. When a fire breaks out, the water flows through the rubber hose and leaks out of the small hole. When it is heated, it vaporizes, absorbs and takes away the heat of the curtain to cool it. The latter is to set up a steel pipe on the side of the back surface of the curtain. On the steel pipe, a small hole is drilled densely. When a fire breaks out, water is sprayed through the small hole and sprinkled on the curtain, and flows down, absorbs heat and evaporates, making the curtain The film cools down.

　　这两类特级防火卷帘门虽都能满足标准请求，但存在如下缺陷：①水以细流方式射出，流淌水较多，所需单位时间消防用水量大;②钢质水管上的小孔，孔径小，平常不用，时间长了易产生锈蚀梗塞，使喷水不均，影响时效; ③汽雾式钢质特级防火卷帘门胶管易老化，重复弯曲易毁坏。

　　Although these two types of special-grade fire shutters can meet the standard requirements, they have the following defects: 1 water is sprayed in a trickle manner, and there are more flowing water, and the required water consumption per unit time is large; 2 small holes in the steel water pipes, The pore size is small, usually not used. It takes a long time to produce rust infarction, which makes the water spray uneven and affects the aging effect. 3 The steam mist type steel super-grade fire shutter door hose is easy to aging, and the repeated bending is easy to destroy.