Safe evacuation system for airflow closed channel in middle of L-shaped building element

Abstract

The invention discloses a safe evacuation system for an airflow closed channel in middle of an L-shaped building element. The evacuation system comprises an L-shaped first static pressure box and an L-shaped static pressure box, wherein the first static pressure box and the second static pressure box are oppositely arranged in parallel; the first static pressure box and the second static pressure are communicated through a ventilation pipe; an air inlet connected with the fan is arranged on the ventilation pipe; a first nozzle and a fourth nozzle, a second nozzle and a fifth nozzle, a third nozzle and a sixth nozzle which blow air oppositely two by two mutually are arranged on the opposite surface of the first static pressure box and the second static pressure box so as to form a jet flow area and a positive pressure area, so that the smoke is prevented from entering the safe area. Due to the specific design of the safe evacuation system of the airflow closed channel in the middle of the L-shaped building element, three groups of collision airflow can be generated so as to form piston flow by collision among airflows, therefore, the smoke in the special area is expelled, so that a safe and clean channel is produced at the side of the L-shaped building element.

Description

technical field [0001] The invention relates to a personnel escape system in a building, in particular to a safety escape system for an airflow closed channel in the middle of an L-shaped 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-stor...

AI Technical Summary

Problems solved by technology

[0005] (1) Flue gas dilution 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 effect of flue gas dilution does not directly depend on the power of the exhaust fan. Because of the suction force of the exhaust fan, a negative pressure will be formed in the building, that is, the pressure inside the building is greater than the outdoor pressure. Powerful smoke exhaust fans are also unable to fully extract the smoke from 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 gas, so the remaining 20%-30% (volume percentage) of smoke gas 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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