Fire Fighting System

Fire linkage control means that after the fire detector detects a fire signal, it automatically cuts off the related air conditioner, turn off the fire damper online, stop changing the fan, and open the relevant piping the exhaust valve, automatically closes the electric fire door, Fire shutters, cut off non-fire power in turn, turn on emergency lighting and evacuation sign lights, stop removing All elevators except fire elevator, and immediately start fire extinguishing through the control center system controller to realize automatic fire extinguishing.

English name — Fire linkage control system
The main purpose – The role of fire extinguishing
Structure – Fire Phone System
Design Type – Bus Form


The linkage form can generally be divided into two forms: centralized control, decentralized control and centralized control combination. The control modes include linkage (automatic) control, non-linkage (manual) control, linkage and non-linkage.

The centralized control system is a system that centrally controls, displays and manages all the firefighting facilities in the system through the firefighting control room. This system is suitable for bus system, digital control, communication system, especially suitable for adopting computer control of building automation management system; when the number of control points is small and dispersed, multi-wire also commonly used. When the number of control points is very large and scattered, in order to make the control system simple and reduce the number of control signals and the number of control lines, a decentralized and centralized system can be used, usually a fire pump, blower , smoke prevention and exhaust fan,  some fire shutter doors and automatic fire extinguishing control devices, etc., centralized control and unified management in the fire control room; large-scale decentralized control systems such as smoke prevention and exhaust fans, fire-proof door releasers etc. can be controlled by on-site distributed control. It should be emphasized that no matter what kind of control system, the actuator action signal of the controlled object should be sent to the fire control room for centralized display. Controlled objects (such as elevators, non-fire-fighting power sources, etc.) that are prone to confusion and serious consequences in high-rise buildings should be centrally managed by the fire control room.

Control Principle

Fire Hydrant

The indoor fire hydrant system is the most basic fire-fighting equipment in a building. The system consists of fire-fighting water supply equipment and electrical control parts. The fire fighting equipment realizes the following control of the fire hydrant system through the electrical control cabinet: start and stop the fire pump; display the position of the button to start the pump, and display the working and fault status of the fire pump.

Automatic Sprinkler System

Automatic sprinkler system can be divided into closed type and open type according to the water spray form; can the former be divided into various forms? Among them, wet sprinkler systems are the most widely used. Wet sprinkler fire extinguishing and automatic alarm system is an important branch system of building fire monitoring system. In the event of a fire, the heat-sensitive element (glass bulb) of the enclosed sprinkler installed in the area is thermally ruptured, causing damage to the pipe network. The pressurized water is sprayed out through the nozzle to extinguish the fire; at the same time, the water flow indicator installed on the branch pipe of the water distribution network acts to send an opening signal, which is received by the water spray alarm box after a delay of lo. After judging the signal, the alarm box sends out an alarm signal and displays the fire line and location; the alarm box outputs the signal, starts the spray pressurizing pump or the spray water pump, increases the water supply of the pipe network, and provides the water and energy required to quickly extinguish the fire source. Water pressure; fire control room takes corresponding fire extinguishing measures immediately after receiving the alarm signal.

Halogenated Fire Extinguishing System

Halogenated fire extinguishing systems are used in buildings that are not suitable for fire extinguishing with water but in important places, such as retrofitting power distribution rooms, computer rooms, archives, etc. Usually, the halogenated alkyl fire extinguishing system is controlled by the fire detection and alarm system to realize automatic fire extinguishing. The commonly used halogenated alkane fire extinguishing agents are 1211 and 1301, which have high fire extinguishing efficiency, fast fire extinguishing speed, no trace after fire extinguishing, and electrical insulation. It is an excellent fire extinguishing agent, but it also has obvious shortcomings: high toxicity and high price; more importantly, it is a destructive agent. One ​​of the main culprits of the atmospheric ozone layer, will face phase-out. Carbon dioxide and other fire extinguishing agents can replace halogenated alkane fire extinguishing agents, and there will be better alternative products to meet the demand in the future.

Ventilation, Air Conditioning, Smoke Control and Electric Fire Damper Control Systems

The usual practice is that the exhaust valve is linked separately, or the equipment needs to design a control module and a monitoring module. After the detector alarms, the control module receives the alarm controller command to open the smoke exhaust valve, and the operation of the smoke exhaust valve is monitored by the feedback signal. module complete

Fire shutter door, fire door control system

For equipment such as fire shutter doors, it is not only required to be able to control the descent from the upper position to the middle position, but also to be able to control the lower position to drop from the middle position to the lower position, and at the same time determine the position of the upper, middle and lower positions if necessary, a manual control button should be added to achieve linkage or non-linkage control.

Fire accident broadcast and alarm system

In the event of a fire, the fire detector detects the fire throughthe transmission line. It is sent to the fire alarm controller, and after manual confirmation, the corresponding speaker is activated or deactivated through the fire broadcast controller; at the same time, the siren is activated and an audible alarm is issued. The speakers require manual operation at the same time.

Non-fire power supply and elevator emergency control

The purpose of controlling the non-fire-fighting power supply is to reduce the continuous development of the fire and reduce the casualties caused by electric shock when the fire hydrant is extinguished. Non-fire electricity includes equipment such as general lighting, domestic water pumps, and air conditioners. Power sources not intended for fire protection, especially lighting power sources, should be used with caution during fires and early stages of fire. Reduce disruption caused by power outages. When it is confirmed that a fire has indeed occurred, the power supply of the air conditioning and ventilation systems not related to fire protection should be cut off first, as it may contribute to the fire and will have no effect on people afterwards. Power is cut off. In response to a power failure of the lighting power, first turn on the emergency evacuation lighting, cut off the lighting power supply in the fire area, and then cut off the lighting power supply in the surrounding fire area.

At the same time, according to the fire situation, all other elevators except fire elevator are forced to stop on the ground floor in turn, and their power is cut off.

Design Principles

  1. Fundamental Principle
    • It must follow the relevant national policies and policies, and be safe, reliable, technologically advanced, economical and easy to use according to the characteristics of the protected object.
  2. Requirements
    1. The scope of building fire protection design is very wide, it is a multi-professional and multi-disciplinary comprehensive problem, and the larger the building scale, the more functions, and the more complex the control project. Therefore, in modern building facilities, the fire protection design must be mechanized and automated as much as possible, and fast and reliable control methods must be used to minimize fire losses.
    2. When designing the system, it should also be noted that under the same conditions, domestic equipment should be used first, and foreign equipment should not be easily imported when it is not necessary. First, foreign products are generally more expensive, need to be exchanged, and will not be repaired in the future. It is convenient and easy to be controlled by others; in addition, domestic products are continuously improved, and various performance indicators and technical levels are not inferior to foreign products. The use of domestic equipment is conducive to promoting the development of national industries, and can also save a lot of foreign exchange. This cannot be ignored.
    3. At present, the relevant standards and specifications that the system design should follow mainly include “Code for Design of Automatic Fire Alarm System” (GB50116-98), “Code for Design of Fire Protection in High-rise Civil Buildings”, “Code for Design of Automatic Fire Alarm System”, “Fire Protection in Architectural Design”, “Code for Fire Protection Design of Civil Air Defense Engineering”, “Code for Design of Power Supply System for Industrial and Civil Buildings”, etc.
    4. The design of the system must be undertaken by the design unit recognized and approved by the relevant departments.
    5. Preliminary design work should be done well:

Understand the basic situation of buildings, including the nature, specifications, functions and individual aspects of buildings; division of fire compartments, fire protection measures for buildings and structures, structural forms and decorative materials; configuration and management of elevators, arrangement of wells; various The layout, nature and use of computer rooms and warehouses.

Understand the relevant professional fire protection facilities and requirements, including the settings of air supply, exhaust, and air conditioning systems; the settings of smoke and smoke exhaust systems, electrical control and interlock requirements; electrical control and interlock settings and requirements; fire shutter doors, fire doors Setup and electrical control requirements: power supply, power distribution system, lighting and power supply control, coordination of fire zones; fire power configuration, etc.

Clarify the design principles, including determining the fire rating and protection method of the building according to the requirements of the code, formulating the scheme of automatic fire protection system, and comprehensively mastering the technical performance and requirements of various fire protection equipment and alarm equipment, etc.