【 Weak current College 】 on automatic fire alarm and fire control system design and equipment selection (2)---Power By 【 China power house network 】

Second, the system selects the

Automatic fire alarm system of the protection object is part of a building or buildings. Different buildings, its nature, importance, fire risk, building structure, fire resistance ratings, distribution, environmental conditions and management forms, etc. The design should carefully study the situation, according to different circumstances choose different automatic fire alarm system.

(A) the system determines

Automatic fire alarm system is a trigger, fire alarm, fire alarms, as well as with other accessibility devices consisting of fire alarm system, is to inform the fire, the early detection and timely to take effective measures to control and extinguish fires set in buildings or other premises by an automatic fire-fighting facilities, are people with fire a powerful tool in the fight.

Alarm system determines the general alarm was the entire system, including parts of point detector alarm button number, and fire hydrants, automatic doors, automatic valves, limit switch, etc. to determine the total amount. That is the size, level of the building, use the function. Automatic fire alarm system of forms, especially in recent years, the research, design units and manufacturers jointly developed some type of automatic fire alarm system, such as intelligent, bus, etc., but in the project application, the most widely used are the following three basic forms: zone alarm system, central alarm system, alarm system control center.

1, zone alarm system

This system is a set of alarm zone to one area alarm controller, system area alarm controller should not exceed 3, area alarm controller on duty yishe room, place.

System see the following figure. 2. set the alarm system to report to the regional, area alarm controller 3 single, centralized alarm system. Set alarm system at least one centralized alarm controller and two or more area alarm controller set alarm controller should set someone on duty a private room or indoor fire ban. System see the following figure.
3, alarm system control center building large scale, there are important to protect objects, fire control equipment and special fire control room, alarm system with control center. System see the following figure.
The above system cabling and detectors, alarm type. With two-wire (that is, the zone alarm to each probe for second-line). Zone alarm is used alone to n + 1, to set alarms to n + N/8 + 1 + 3 + 1-style, design, construction and more convenient, and cost reduction.

In addition to these systems, the domestic manufacturers have implemented bus system alarm. Different manufacturers bus system is different, but the common denominator is the bus system, address encoded form.

(1) the second bus system centralized alarm system. Zone alarm to detector line just two buses that every part of the controller has its own number, which is a part of an address unit. If JB-QB-50-2700/076-type, for example, it adopts advanced single-chip technology, the CPU host will continually to addressing unit from code. When addressing unit receives a host of signal, to determine if the addressed units of code and host of the code is the same as the addressing unit response. The host receives the addressed cell returns address and status, signal processing, judge: If addressing unit correctly, the host will continue polling; determine if the fault signal, will issue a fault zone of sound, light and alarm signals. In case of fire, the master confirmed that the fire alarm signal is memory, also issued fire area sound, light and alarm signals.

In a real application, if one zone alarm control, in the second bus can add 50 addressing unit; controlled two layers, each layer 2 bus can add 35 addressing unit; control of three layers, each layer 2 bus can pick 25 addressing unit. 076-zone alarm extension type can set 200 addressable unit.

(2) three bus system centralized alarm system. The alarm is a single-chip 8031 to central control unit, computer management and three-wire system alarm. Three bus system through three bus and charged of the regional alarm. Three bus system in engineering application comes in two forms: floor repiter-central alarm system, regional alarm — set alarm system.

① floor repiter-central alarm system

Floor repiter can address probes sent code, code, display the layer of alarm, a broken line fault alarm function. The system applies to every layer does not exceed 32 alarm parts, floor no duty point, first floor, there are always on duty.

② zone alarm – alarm system set

By regional alarm and standards set alarm consisting of two-level management bus system, fire alarm system, applicable to each alarm number, location and floor desk-sized hotels and other buildings.

Take bus system alarm system wiring is simple and easy to design, construction, and other alarm system compared to more interface elements.

(Ii) fire control system

Fire control system has no linkage, live interaction, centrally coordinated several forms.

In a real project, alarm systems and fire fighting system with the following form:

1, regional — set alarm, horizontal linkage control system.

This system each layer has a compound area alarm controller, he has an automatic fire alarm function, can receive some of the alarm signal, such as Manual alarm button, flow meter, fire dampers, linkage control some fire equipment, fire doors, rolling doors and exhaust valves, etc., and to set alarm send alarm signal and interlocking device action feedback signal. This system is mainly intended for advanced hotel building, each layer or zone service personnel on duty, there is a whole floor of fire control centers, specialized arcAnti personnel on duty.

2, regional — set alarm, vertical linkage control system.

This system is mainly used in high-rise "Matchbox"-hotel building. Such buildings standard layer, alarm zoning comparison rules, each floor has a service staff on duty, the whole building a fire control centre.

3, large regional alarm, vertical linkage control system.

This system is mainly suitable for no standard storey office buildings, such as information centres, libraries, archives, etc. This class of buildings of every layer does not have the service staff is on duty, it is not advisable to set zone alarm and fire alarm great regional center, specialized fire officers on duty.

4, area: set alarm, decentralized control system.

This system field in the linkage between devices with the "control box", to implement in-place control device, the device action feedback signal sent to the fire service center. Fire Centre on duty can also manually manipulate linked devices. This system is suitable for small and medium high-rise building and room size.

In addition, automatic alarm and fire control in one of the fire extinguishing system, such as automatic fire-extinguishing appliances. FJ-2714 This system is mainly used in the computer room and generator room, valuables warehouses, archives, library and other places of automatic fire alarm and automatic fire extinguishing. Fire-extinguishing, pharmacy has strong capacity, high efficiency, small metal corrosion, non conductive, long-term storage is not bad, not deface fire objects, etc., but the cost is high.

Automatic fire alarm system design, you must follow the guidelines, policies, norms and public security fire department about regulations for protection of objects, be safe and reliable, technologically advanced, affordable, easy to use. Automatic fire alarm system of the protection object is part of a building or buildings. Different buildings, its nature, importance, fire risk, building structure, fire resistance ratings, distribution, environmental conditions and management forms, etc. The design should carefully study the situation, according to different circumstances choose different automatic fire alarm system: Protection object is not large, important level, you can choose the zone alarm system, when the area alarm controller vertical warning detection area on each floor, each floor of the staircase is obviously part of the lighting installation identification floor to show devices fire (especially during the night of fire), be able to locate the fire zone, and rapidly take the appropriate measures; protecting the object size, criticality, concentration, linkage, also may use the set alarm systems or control center and alarm system.

Ultimately, the choice of ways to alert, to determine what kind of system, should be based on actual projects.