Knowledge popularization: (illustrated) Composition and action principle of automatic fire alarm control system The automatic fire alarm control system consists of photoelectric smoke detector, temperature difference detector, manual alarm button, hydrant button, sprinkler, water flow indicator, wet alarm valve, pressure switch, floor display, fire valve, smoke exhaust fan, positive pressure blower, positive pressure blower valve, fresh air unit, air conditioning unit, fire elevator, fire broadcast and fire alarm. Cut off non-fire power supply, controller host and display system. 1. photoelectric smoke detector is a kind of fire detector to detect smoke particles produced by combustion. Photoelectric smoke detector is very effective as an early and early fire alarm. For important places that require small fire losses, there is a smoldering stage at the beginning of the fire, which produces a lot of smoke and a little heat, with little or no flame radiation. Both are suitable for choice. 2. Differential constant-temperature detector The differential constant-temperature fire detector detects the ambient temperature by using the sensitivity of heat-sensitive elements to temperature, which is especially suitable for places where the temperature rises sharply during fire, and can be used in conjunction with smoke detectors to detect fires more reliably. Reduce losses. 3. Manual fire alarm button Manual fire alarm button is mainly installed in places where people often go in and out and are obviously easy to operate. When someone finds a fire, press the button manually and send an alarm signal to the alarm controller. Manual fire alarm button is more urgent than probe alarm and generally does not need confirmation. Therefore, the manual alarm button requires higher reliability and accuracy. Fire hydrant button Fire hydrant button is installed in fire hydrant box. When a fire hydrant is found, manually press the button and send an alarm signal to the fire center. When the host is set to automatic, the hydrant pump will be started directly. 5. The glass ball working at 68℃ in the nozzle is red, and the glass ball working at 93℃ is green. Use in high temperature places such as kitchen. 6. The water flow indicator is installed on the floor branch pipe of the automatic sprinkler system, and it is 1 from the top floor to the basement. When the water in the pipe network flows and the velocity is greater than 1.5l/min, the water flow indicator will change the state of the switch because the blades are impacted by the water flow, and send out an alarm signal, thus playing the role of detecting and indicating the lower alarm limit. 7. The wet alarm valve makes the water flow in one direction. Depending on the reduction of water pressure on the side of the pipe network, the valve disc will open, and when it bursts, there will be a sprinkler to send water to put out the fire immediately. 8. The smoke exhaust system of the smoke exhaust machine is an important guarantee for the safe evacuation of personnel. Smoke exhauster can be used for low-speed ventilation at ordinary times, and high-speed smoke exhaust can be started remotely in case of fire. 9. The smoke exhaust valve is arranged on the ventilation pipeline, and it is usually closed. If there is a fire, open the smoke exhaust valve in the fire area. 10. When the positive pressure blower is on fire, the escape route should be the stairwell. Therefore, it is very important to keep the positive pressure in the stairwell so that fireworks cannot enter. The positive pressure fan is generally located on the roof and connected with the positive pressure valve of each floor. In case of fire, open the air valve and start the positive pressure blower. Make the staircase and elevator hall in a positive pressure state. 1 1. Positive pressure air supply valve positive pressure air supply is to prevent smoke from entering the evacuation area. In case of fire, open the positive pressure fan and the corresponding positive pressure air supply valve in the corresponding area, and charge fresh air with high pressure to achieve the purpose of smoke prevention. 12. The fresh air outside the fresh air unit building is inhaled by the unit, and then sent to each room through the air supply pipeline after temperature adjustment and humidification. 13. A small amount of fresh air outside the building and a large amount of indoor return air of the air conditioning unit are inhaled by the unit, and sent to each room through the air supply pipeline after temperature adjustment and humidification. 14. Fire damper The fire damper is installed at the air return port of the air conditioning duct. In case of fire, closing the fire damper can block the air duct and play two roles: 1. Don't send air to the fire scene. 2. Prevent the fire from spreading from the air duct to other places. 15. When a fire occurs in the fire elevator, the elevator must be forced to land on the 1 floor in any direction and position and automatically open the door to prevent people from being trapped. After arriving at the 1 floor, the elevator will turn into a fire-fighting state. Fire rescue personnel can carry out fire fighting operations according to the situation. 16. Fire broadcast is used to direct evacuation. 17. The fire telephone is used for communication between the fire center and the site, and can start multi-party call, alarm, police investigation, direct rescue and fault contact. 18. Fire hydrant pump 19. Spray pump 20. Water pressure switch. Send the contact action output signal to the main controller of the fire control center. 2 1. Controller The host fire alarm controller is the core of the automatic fire alarm control system. ① It can receive detection signals, convert them into acoustic and optical alarm signals, indicate the fire location and record alarm information. ② The fire alarm signal can be started by the fire alarm sending device. Or start the automatic fire extinguishing equipment and linkage control equipment through the automatic fire extinguishing control device. ③ Automatic monitoring system, which is used for correct operation and gives sound and visual alarm for specific faults. 22. Display system 23. After confirming the non-fire electrical fire, it should be possible to manually cut off the non-fire power supply in the relevant area in the fire control room or power distribution room. "It can be seen that the national fire protection code has made strict provisions on cutting off the non-fire power supply, that is, after confirming the fire, only the non-fire power supply can be cut off. This shows that the cut-off of non-fire power supply is a very serious problem, and it cannot be automatically cut off as soon as there is a fire. The whole building of the fire control room is used to cut off the non-fire power supply: water chillers and their auxiliary pumps, all air conditioning units, fresh air units, fan coils, passenger elevators, communication switches, 1 all lighting above the building (except the fire control center) and 1 all non-fire power supply above the building. It is a fire-proof and heat-insulating facility suitable for large openings in buildings. The product adopts hidden scroll design, and the structure is reasonable and compact. The curtain surface of fire shutter can be raised and lowered by transmission device and control system, which plays the role of fire prevention and fire isolation. The product has smooth and beautiful appearance, novel shape and strong rigidity. Fire shutter doors are widely used in fire zones of industrial and civil buildings, which can effectively prevent the fire from spreading and ensure the safety of life and property. This is a modern building. The system has three control modes: automatic, electrical manual and mechanical emergency manual. The system mainly consists of gas fire extinguishing controller, fire extinguishing agent storage bottle, bottle head valve, electromagnetic bottle head valve, selector valve, liquid flow check valve, gas flow check valve, safety valve, pressure annunciator, fire detector, bottle storage rack, nozzle and pipeline system. According to the use requirements, it can be designed into a pipe network-free system, a unit independent system and a combined distribution system to realize single-zone distribution.