In recent years, with the continuous development of the city and the towering high-rise buildings, fire evacuation passages have become an indispensable part, and fire passages cannot lack the use of fire doors. Fire doors are a common building that can be opened or Closed fire partition components, with the use of fire doors, can play a role in separating the fire in the building, such as separating the fire within a certain range to prevent the spread of fire and smoke.
As an effective smoke prevention method, positive pressure air supply has been widely accepted and adopted in the design of high-rise buildings at home and abroad. When a fire occurs, the air outlet of the positive pressure air supply system can make the stairwell and the fire front room form a positive pressure relative to the walkway, block harmful smoke from entering the evacuation passage for people, and ensure the normal opening of the fire door. Escort for safe evacuation. However, if the air supply opening is opened for a long time, the pressure difference between the two ends of the fire door can be too large, and the fire door cannot be opened normally, resulting in serious consequences for personnel to be unable to evacuate. Countries with advanced experience at home and abroad make the following requirements for the positive pressure air supply system.
According to GB51251-2017 "Technical Standards for Smoke and Smoke Exhaust Systems in Buildings" 3.4.4 The mechanical pressurized air supply volume should meet the increasing distribution of pressure from the corridor to the front room to the stairwell, and the residual pressure value should meet the following requirements: The pressure difference between the enclosed refuge floor (room) and the walkway should be 25Pa~30Pa; the pressure difference between the stairwell and the walkway should be 40Pa~50Pa; when the residual pressure of the system exceeds the maximum allowable pressure difference, pressure relief measures should be taken .
Ensuring that the residual pressure of the evacuation passage can be effectively controlled when a fire occurs is a new fire protection trend. However, the current mechanical pressurized air supply system itself does not have the ability to judge whether the pressurized zone maintains a certain pressure, or the pressurized zone leaks too much, the pressure does not meet the standard, does not play a role in preventing smoke, or is caused by excessive pressure Evacuation of blockages, and how to detect the condition of the pressurized area in time, and use high-speed pressurized air volume to maintain a relatively stable residual pressure in the stairwell and front room is a key issue.
The birth of the residual pressure monitoring system is a sign of keeping up with the times in the fire protection work. In the event of a fire, the system can measure the pressure difference between the building's indoor room and the elevator front room, the elevator front room and the fire stairway through the pressure difference between the two sides of the fire door, and convert it into a signal to output to the residual pressure monitor. The residual pressure controller is used to control the opening and closing of the bypass pressure relief valve of the ventilation duct, and to control the pressure difference between the two sides of the fire door to prevent excessive pressure from preventing the normal opening of the fire door when the building is on fire. At the same time, on the premise of ensuring the safety and rapid escape of personnel from the fire scene, the pressure difference switch is used to control the residual pressure stepwise and to ensure that smoke will not flow back into the front room and staircase.
With the continuous progress of modern scientific and technological means, compared with the traditional fire protection field in the past, the integration of intelligent fire protection field can better meet people's safety guarantee in fire protection construction.
The residual pressure monitoring system developed and produced by Shenzhen Lingxiang Equipment Co., Ltd. can be linked with fire protection, and has certain market power and prospects. The products are mainly composed of LX-JKQ fire emergency evacuation residual pressure monitor, LX-CGQ fire emergency evacuation residual pressure sensor, LX-KZQ fire emergency evacuation residual pressure controller and other parts, realize automatic linkage with pressure relief valve when residual pressure alarms, and provide visual real-time status display, alarm printing, control test, authority management, etc. And the product has been put into production and used in actual engineering cases, and has been well received by the market, and has also been recognized by relevant governments and fire departments. It provides a more complete escape plan and prevention for fire evacuation and emergency escape.
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