【 Weak current College 】 automatic fire alarm system design and coordination of firefighting equipment selection---Power By 【 China power house network 】

Abstract: the automatic fire alarm system design affected by the choice of a variety of fire fighting equipment. This article on automatic sprinkler systems, fire extinguishing system, smoke and smoke extraction system, elevators, fire shutter now generally use of fire-fighting equipment, discusses the current automatic fire alarm system design of the system and the specific design practices.

Keywords: gas fire extinguishing system for smoke and smoke exhaust system lifts fire shutter

Automatic fire alarm system design and various fire equipment choices are closely linked. In the design of the automatic fire alarm system should be based on the electrical, plumbing, HVAC, and other related professional selection of fire fighting equipment for safe application, advanced technology, reasonable design. The automatic fire alarm system design and fire protection equipment to choose between his views on the points for discussion on everyone.

First, the automatic fire alarm systems and automatic sprinkler system with

Automatic sprinkler system by sprinkler, alarm valves, flow alarm device (flow indicator or pressure switches), and other components, as well as pipelines, water supply facilities, and in the event of a fire sprinkling of automatic fire extinguishing system. Automatic sprinkler system is divided into a closed system (including the wet sprinkler systems, dry sprinkler system, preaction system) and open system (including the deluge systems, water systems, etc.).

Automatic fire alarm system design, according to the sprinkler system of different types and different equipment selection, design the corresponding alarm, linkage line and equipment. The automatic fire alarm system design and commonly used fire sprinkler systems meet to talk about their views on:

1. automatic fire alarm system design and wet and dry sprinkler system with

Wet sprinkler systems and dry sprinkler system wet alarm valve pressure switches, flow meter, safety signal valve, spraying pumps and other equipment choices, are needed and the automatic fire alarm system design. According to the automatic fire alarm system design code (GB50116-98, hereinafter referred to as the "beep specifications") section 6.3.3.3, fire control equipment for automatic sprinkler system should have the "display flow indicator, alarm valve, safety valve for operation" function. The current widely used bus system for automatic fire alarm system. In automatic fire alarm system design should alert the bus through the signal module receives the signal flow indicator, safety valve, contact signal, transmitted to the automatic fire alarm controller displays the status of their work. And water flow indicator. Safety signal valve connection of the signal module shall have independent alarm address coding and signal flow indicator, safety valve of different role, its signal module to transmit signals shall be share. Attention in the design flow indicator and safety valve has a need to add DC 24V power supply and do not need to add the power of two types. Election to use need to add DC 24V power supply flow indicator, safety signal valve, water flow meter, safety signal valve provides DC 24V power supply. At design time, you should also note the selected signal modules receive signal contact way passive contact and two active contacts, generally with passive contact input mode. When the device output signal and the signal module input signal contacts the same way, the direct access; when the device output is active contact signal and the signal module only receive passive signal contacts by signal conversion such as convert passive intermediate relay contacts, there is a non-contact type output security signal valve product, its output is a high and low level switch quantity of active signal, using a signal module is passive contact input mode, should signal is converted to a passive contact signal, and then output to the signals of the module.

5.3.2 the beep specifications ", as well as the automatic sprinkler system design code (GB50084-2001) 11.0.1 stipulates that wet alarm valve pressure switches and contacts and fire control room manual button should be able to directly play pump delay. We at design time, in the absence of fire control room of the project, should be wet alarm valve pressure switch contact line direct to wet sprinkler systems spray pump control boxes and implement direct from pump and display delay time signal function; equipped with fire control engineering, fire control room should be set manually linkage Console (i.e. XKP), a pressure switch contact line to XKP spare, converted for automatic and manual control spray pump, and displays the signals.

Should fire control indoor display dry sprinkler system of the highest and lowest pressure alarm signal. Linkage console to linkage air compressor, when in low pressure starting air compressors.

2. automatic fire alarm and fire extinguishing systems, rain water fire extinguishing system and other open-sprinkler system with

Rain fire extinguishing system is composed of automatic fire alarm system or transmission control. When the fire broke out, and automatic opening and rain alarm valve and start the pump to the open type of sprinkler head of water sprinkler system. Open type sprinkler system for a notable characteristic is: need automatic fire alarm system of fire detector alarm signal, control open rain alarm valve, by automatic fire alarm controller will automatically control signal transmission to the linkage of the console, in the linkage console automatically and manually start the pump, etc. Open rain alarm valve has two control modes: the first is the extinguishing system reserve nearest smoke and heat detector "and" gate, "when they are action, through the control circuit control open rain alarm valve and return action signal; the second is by sprinkling system protection against fire in any fire detectors and alarm, and confirm that the fire, the fire alarm controller issued a control signal to the input and output modules, open rain alarm valve and return action signals. Using the second way to control features, the rain alarm valve should be opened only after confirmation of fire. Reliability from the alarm should be the second control.

3. alarm detectionDevices, equipment and line and automatic sprinkler system with

The automatic fire alarm system construction and acceptance (GB50166-92) 2.3.1 stipulates that point-type detector installation location should be consistent with the "detector around 0.5m, there should not be screened for." Detector and sprinkler installation distance should not be less than 0.5m.
Automatic fire alarm system of the device (such as signal modules, control modules, etc.) need to be installed in automatic sprinkler system equipment nearby should do waterproof, damp-proof measures. Recommended that the equipment is relatively concentrated in the device box (carton), easy to make waterproof, moisture-proof of processing, easy installation, wiring.

Follow the alarm code 5.3.2 of the fire pump when a bus coding module control, it should also be in fire control room linkage Console (spare) is set to manually direct control. Interactive console (a) shall be subject to multiple wire line to the fire pump control box, in the linkage Console (spare) for automatic and manual control directly kai, stop, and displays the status and power supply for the pump.

Second, the automatic fire alarm systems and fire-extinguishing systems with

Current common gas fire extinguishing system consists of: CO2 gas fire extinguisher system, heptafluoropropane inert gas extinguishing systems. According to the structure is divided into a network patterns and no network type.

A network of gas fire extinguishing system according to the alert code section 6.3.4 requirements: fire linkage Console (disc) on gas fire extinguishing systems for manual and automatic operation; in all phases of alarm, Jet, fire control rooms should have the appropriate sound, light alarm signal and can manually cut sound signal; the delay period, it should automatically close the corresponding fire protection doors and Windows, ventilation and air conditioning systems, stopping off for parts of fire dampers; display gas extinguishing system protection zone alarm, shot put and fire doors (window), ventilation and air conditioning equipment State. Alarm, fire blast phase in the control room's acoustic and optical alarm signal through the signal module access alarm bus, fire alarm controller issued a sound, light alarm signal; related fire doors, Windows, and other devices close to issue control signal control module. After the fire alarm equipment confirm confirmation before they start or artificial gas fire-extinguishing system, in order to be accurate and reliable, to reserve the scene started manually. Fire linkage Console (disc) only display gas fire extinguishing system for manual and automatic work, a failed State, does not require fire-extinguishing system control room control.

No network of automatic gas fire suppression equipment, such equipment for gas spray, cylinders, automatic fire alarm controller and integrated, automated gas fire extinguishing cabinet formed and has a sound and light alarm and automatic, manual control, alarm detector and other functions. Their device with a high degree of automation, high reliability and ease of installation, maintenance, can be used as diesel generator room, gas-fired air conditioning room, library, computer room and space for important fire safety facilities. The current specification does not prescribe no pipeline of gas fire extinguishing systems and fire alarm system linkage control, the author believes that there should be reference network of gas fire extinguishing systems and fire alarm system linkage control. From fire Cabinet of alarm controller leads linkage signal cable to the linkage of fire control room Console (spare) shows the status of the fire-fighting equipment, fire suppression of signal automatically, manually control should fire Cabinet control. In addition to using automatic gas fire extinguishing installations with alarm detector fire alarm controller inside the Cabinet, the recommendations in the protection zone and the other set fire alarm detectors, alarm bus add-in to fire control, fire alarm controller, sound, light and alarm system.

3. automatic fire alarm system and smoke and smoke exhaust system with

Smoke and smoke exhaust system is mainly composed of smoke fire dampers, smoke and exhaust blower, pipe, air, etc. Now smoke fire damper shall have, when the gas temperature up to 70 ° c and forcibly turned on or off, and output features of electric contact signal. The project does not set a fire control rooms of smoke and smoke exhaust system design time, you can use this electric contact signal directly to the appropriate pressure blowers and exhaust fan of the control cabinet, break open smoke and exhaust blower, and stop the site of the air conditioning system. When the smoke and exhaust fan mains of smoke fire damper temperature reached 280 ° c, the valve closes automatically, the limit switch output contact direct linkage smoke and exhaust blower is turned off. Equipped with fire control engineering, smoke and smoke exhaust system design should use electric fire dampers, according to the alert code 6.3.9 stipulates that in the electric fire damper set control module, open the appropriate after fire alarm smoke partitions within the pressurized air or exhaust mouth of electric fire dampers, close the relevant parts of the air conditioning system, and returns the action signal. Smoke and exhaust blower on, should be automatically linked control signal transmission via linkage control line, the same console to linkage in accordance with the alarm code 5.3.2 of linkage console in addition to set automatic control, it should also be set manually direct control. Linkage between the console and smoke and exhaust blower control box should be located between multiple wire linkage control line, done in linkage console can automatically and manually control smoke and exhaust blower's start-up and shutdown, show fan status signal and fire power for operation. Some of the engineering design will exhaust and smoke exhaust system with a set, exhaust, fire smoke. Fire alarm, you should open the smoke exhaust port within the district, and close vents, linkage open exhaust (exhaust) machine.

Air conditioning system wind pipe fire damper, is generally used when the wind park temperature 70 ° c valve closes automatically, with output contact. Without setting the automatic fire alarm system, can use this contact to go off air conditioning blowers; equipped with automatic fire alarm system engineering, simply use the control module linkage gateway blowers can be. If the air supply pipes adopt electric fire damper, fire alarm, control shutting down corresponding parts respectively module supply duct electric fire dampers on and off the air conditioning blowers.

In accordance with the high civil building design fire protection standard (GB50045-95, 2001 Edition) 8.4.11 and garage, garage, parking design fire protection standard (GB50067-97, hereinafter referred to as the "specifications"), the provisions of article 8.2.7, tall buildings set mechanical smoke extraction of basement and garage in no direct path to outdoor exit fire district, set mechanical smoke extraction system, you should also set the air distribution system. Air supply system of blowers and air valves, when the fire, which should be linked to open air blower power shall be conducted in accordance with the requirements of fire power supply.

4. automatic fire alarm system and lift with

According to the alert code 6.3.1.9 stipulates that "fire control rooms in confirmation after fire, should be able to control all of the stops on the first elevator, and receive their feedback signal. "The automatic fire alarm system construction and acceptance (GB50166-92) section 4.3.2 of the fire," forces the elevator stopped on the first layer test "on the other the elevator does not make the test. Through the alert code execution, now more common view was that in the confirmation control fire after fire stop on the first floor elevators, the passenger elevator nearby flat layer (because the elevator shaft props have chimney effect, passenger elevator cannot be used as an evacuation. When the lower fire, passenger elevator occurs just above the layer of fire, if you want to make passenger elevator down to the bottom, it must pass through the fire, for passenger elevator cabin staff is not secure). In passenger elevator when ordering, be aware of with automatic leveling feature. Only the passenger elevator with automatic leveling function devices, the fire and the failure of a power failure, ensure that the passenger elevator car within the safety of personnel, this is essential. After the confirmation by the fire, fire control console (disc) to fire the elevator stops at the first floor for fire extinguishing fires; stop passenger elevator power, enabling the nearest passenger elevator leveling, passenger elevator automatic leveling device inside the cabin personnel quickly evacuate the elevator from the nearest evacuation staircases or safe export evacuation to safety.

Fire in the first floor with elevator emergency landing button, the first fire elevator stopped on the floor line, and join in the fire service lift emergency landing landing control and a button to return to the signal contact, through the contact signal control fire elevator stopped on the first floor.

5. automatic fire alarm systems and fire shutter with

Fire shutter motor power normally three-phase AC 380V, fire shutter controllers control power can connect the AC or DC 24V. According to the alert code 6.3.8, in evacuation channel fire shutter should be set shutter two smoke and heat detector unit, on either side of the smoke detector action, through the alarm bus control module to control fire curtain dropped from ground 1.8m, thermal detectors actions, fire shutter down to the end; as fire zones separated by fire shutter, when either side fire zones fire detector actions, fire shutter should be a drop in the end. Fire curtain sides should set manual control button in the detector unit malfunction, forced open fire shutter. When the next fire shutter curtain spray system protection, you should also start water solenoid valve and rain pump. Equipped with fire control room, the action signal fire detector and fire shutter closing signals should be sent to the fire control room display.

Set the detector of many places, the only appropriate for a type of fire detection and fire detectors. If the vehicle specifications, pointed out: "as in poorly ventilated garage, subject to the influence of vehicle exhausts, sets the smoke detector frequent it gap. In addition to open garage, garage in thermal detectors. "Evacuation channels usually belongs to the open space, the temperature is not easy to assemble, should not be using thermal detectors, smoke detectors suitable for settings only. Therefore, we in design practice, the adoption of one type detector "and" door signal control fire shutter of a decline. Evacuation channel fire shutter time fell to the ground from the fireproofing 1.8m fire shutter time down to the end. Evacuation channel fire curtain of the second descent control, fire shutter control box with time relay delay down to the end. Over the years have proved that this fire shutter down control mode, the control link small, reliable, and has been a lot of areas such as Sichuan, Shenzhen Fire Department.

Automatic fire alarm system design and selection of fire fighting equipment, fire protection products should be combined with detailed technical information, and related closely to design secure, reliable, reasonable automatic fire alarm system.