Safe evacuation system for airflow closed channel on side of building element

Abstract

The invention disclosed a safe evacuation system for an airflow closed channel on side of a building element. The safe evacuation system comprises a first static pressure box, a first nozzle, a second nozzle, a second static pressure box, a third nozzle, a fourth nozzle, a ventilation pipe and a fan and is characterized in that the first nozzle and the second nozzle are connected with the first static pressure box (1). The third nozzle and the fourth nozzle are connected with the second static pressure box (4). The first static pressure box and the second static pressure box are connected with the ventilation pipe. The ventilation pipe is connected with the fan. Due to specific design of the safe evacuation system for the airflow closed channel on side of the building element, four groupsof collision airflows are generated, and then the piston flow can be formed by the collision among airflows. Therefore, the smoke in the special area can be expelled, and then a clean and safe channel is generated in the building component, so that a clean and safe evacuation path is created for escape.

Description

technical field [0001] The invention relates to a personnel escape system, in particular to a safety escape system for an air flow closed channel at the edge of a building component. Background technique [0002] A large amount of smoke will be produced after a fire, and high-temperature smoke is the main cause of death in a fire. Since the flue gas is at a higher temperature than the environment, its density will be lower than that of air. The low smoke density compared to the surrounding air creates a buoyant force which causes the smoke to move upwards. When the flue gas moves upwards and hits the ceiling, the flue gas that touches the ceiling later will push the flue gas that touched the ceiling before. This results in a horizontal movement of the smoke along the ceiling, which smoke studies have shown to be very dangerous as it carries the smoke to all parts of the building. [0003] Studies have shown that for building elements or multi-storey buildings, the height ...

AI Technical Summary

Problems solved by technology

[0005] 1. The dilution of flue gas is not completely eliminated. Most of the flue gas still exists in the building, and this part of the flue gas will also cause loss of personnel and property

[0006] 2. The flue gas dilution effect does not directly depend on the power of the exhaust fan, that is, the greater the exhaust fan exhaust volume, the more effective it is. Because of the suction force of the exhaust fan, a negative pressure will be formed in the building, that is, the building will The pressure inside the building is higher than that of the outside, in this case the smoke exhaust fan will not be able to completely extract the smoke from the embarrassing situation in the building

However, due to the turbulence and random fluctuation of the flue gas, this makes the flue gas itself different from the wind speed of each nozzle.

As a result, the stairwell smoke prevention system has a blocking rate of only 70-80% (volume percentage) of smoke, so the remaining 20-30% (volume percentage) of smoke will enter the patented smoke protection area

[0010] 2. The previous application cannot rule out the smoke passing through the "jet" nozzle and hitting the jet area. On the contrary, due to the action of multiple jet nozzles up and down, the diffusion of smoke passing through the jet area will be accelerated

There are three pairs of six jet nozzles in the earlier application for the smoke prevention system. Through later research and practice, we found that the technical improvement design of the earlier application increases the initial investment funds, manufacturing difficulty and operating costs of the system.

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