【 Weak current College 】 on fire automatic fire alarm system design---Power By 【 China power house network 】

As electronic scientific and technological progress, automatic fire alarm system is considerable development, from the original number of wire and N + 1 wire automatic fire alarm system, to the development of the bus now, bus, bus forms of automatic fire alarm system.　 And bus forms of automatic fire alarm system to its alarm of high sensitivity, low false alarm rate, alerting equipment reliability design simple, quick, easy, efficient, and other characteristics, as the current market leading products. Currently, electrical designers for automatic fire alarm system design is often to follow the following three standard single measures: GB50116-98 the automatic fire alarm system design specifications "(hereinafter referred to as the" beep specifications "); GBJ16-87 (2001) the building design fire protection standard (hereinafter buildings》); JGJ/T 16-92 the civil construction electrical design code (hereinafter referred to as the" civil code "); 2003 Edition of the national civil construction engineering technology measures — electrical law (hereinafter referred to as the" measures "). On different structures should follow different architectural design specification, for example GB50045-95 tall buildings design fire protection standard, GB50073-2001 the cleanroom design code. The specification on the detector set, composed of the fire control equipment, control features are required, but in the design process, from designers to understand the different device specifications are different, ways of implementation varies accordingly. On a building, it should set a fire control room, on a community, should be set a fire control centre, which consists of fire alarm control cabinet, fire control equipment, emergency broadcasting fire communication devices, computers, displays the print device, etc., in order to centralize control of management. 　　Every single community hosted inside the internal fire room, fire alarm control, fire control equipment, etc. 1 automatic alarm alarm system may be made of fire detectors, alarm and centralized alarm zone. Timely, accurate is the focus of public concern. False positives is a common problem, to prevent false positives, we can at the same place to choose different types of detectors, only two probes are alarm is alarm only actions so that you can more accurately in the alarm on, the computer displays the exact location of the fire. Specification of the location of the detector set specific requirements, we should consider in the design in different places of the detector. 　　Civil building should focus on public space probe sets, industrial building detector set to consider storey, fire danger, of explosive areas, cable, sandwich, and other factors. The present building space, room height too high and more generally, line infrared beam detectors use more and more. 　　On the explosion site detector settings, the author believes should be set in the vicinity of combustibles explosion-combustible gas detector, in the entire locale explosion-proof point of the smoke or heat detector, explosion-proof Manual alarm button. High-rise buildings in each layer yishe fire monitor, the underground garage of the probe arrangement should consider the effect of the beam. 　　Alarm should be set in the bus circuit protectors. The specification on the detector, the alarm button settings are not identical. The measures "in the linear detector settings area, height requirements in more detail, the explosive gas places gas detector selection, image selection of fire detectors have detailed provisions, but there are no other specification. 　　In Manual alarm button, only the civil standard "requirement is the distance 25m, height 1.5m, other specifications are distance 30m, height 1.3 ~ 1.4m, the author believes can distance 25m, height 1.4m to design. 2 linkage control fire pump, spray pump start, smoke and exhaust blower starts, for non-fire power, Elevator landing, fire shutter of logic programming, any confirmed fire signal should be linked above fire facilities. Confirm that the fire signals: the most reliable confirmation is artificial confirmation (such as Manual alarm button signal, the signal to open valve and hydrant Kai pump button signal, wet alarm valve pressure switches, etc.); and system design, automatic confirmation to general use two sets of probes or two different types of fire detectors and alarm "and" door signal as the Confirm method of fire ", to confirm the removal of non-fire, fire power and elevator landing; fire alarm after cessation of air conditioning, close the electric fire dampers, start the site of the smoke and exhaust fans, exhaust valve, etc., and receive feedback signal. 2.1 fire control room manually direct start to ensure that important equipment started in fire control, you must set the hard line and important equipment control cabinet direct connection through relay directly start pumps, regardless of the equipment at the scene control cabinet hand automatic transfer switch on what state the control rooms in fire can directly start important devices. 　　In a large complex of deconcentration and concentrate on the principle of combining, in various buildings on duty, you can directly start equipment, fire protection control center can display alarm position, display the device status, to do manually starting device must be assigned many outdoor lines, according to the project actual situation to determine the problem solution, try to make direct starting manually. 　　2.2 field module application site monitor module, enter the name of the module, but essentially the same as the main receiving spot device, such as fire alarm button, the flow meter, wet alarm valve pressure switches, fire dampers, etc, and also can receive linear detectors, gas detectors for alarm signals. Scene control module, the output is different from the name of the module, function, control site equipment and receive their feedback signal, such as sound and light alarm, electric fire curtain, air, exhaust valve, non-fire power down, etc. Field modules add distribution box should be considered when the quarantine measures ELV. 3 fire broadcasts broadcasts fire, fire communication design, civil building fire broadcasting should be combined with public broadcasting. Accident radio power amplifier should be located a two main one slave, and power to meet the requirements. Tap more with bus system devices, each set control module; tap a small device with multiple-line. 4Alarm control device of choice of alarm device selection shall take into account the nature, rationality, and economics. 　　According to the building's size, the number of alarm circuit can be selected alarm equipment specifications, select the number of points to the appropriate specification manipulate little, for a small amount of capacity is available, the host, the detector to choose intelligent, big space use ordinary detectors or linear infrared detectors to reduce cost. In the case of joint equipment although non-standard equipment, every project is different, but the equipment manufacturers to provide a standard accessories, such as gas extinguishing control tray, telephone, radio, amplifier, and so on. 　　Specific design-time selection of accessories, according to the number of parts to determine the number of the Cabinet, each cabinet consideration should be given the power, the location of the Terminal Board. Gas fire extinguishing system is a separate system, design gas extinguishing controller position outside the protection zone in General. 　　Suppose that the whole building has a set of alarm control system, fire control rooms should consider some equipment to monitor the control of gas fire protection zone alarm point, control points. Computer control displays the device's features, more intuitive interface, software programming is very flexible. Alarm point shown on the drawings are very clear, and to recommend appropriate control request, reduced duty personnel misoperation. 5 alarm power and fire system wiring automatic fire alarm system of the main power supply design use fire power. The automatic fire alarm system of line types, including police wiring, linkage control circuits, power cord, floor repiter lines, radio lines, fire communication lines, communication lines from the host machine. Various line use flame-shaped copper-core cables laid along the bridge or wear tube dark. Equipment for special requirements, use shielded cables.
　　
Reference documents
1 the automatic fire alarm system design code GB50116-98
2 the building design fire protection standard of GBJ 16-87 (2001)
3 the civil construction electrical design code JGJ/T 16-92
4 the national civil construction design techniques-electrical law 2003 Edition
5 the tall buildings design fire protection standard "GB50045-95
6 the cleanroom design code GB50073-2001