Automatic smoke exhaust device for large-space building catching fire

Abstract

Provided is an automatic smoke exhaust device for a large-space building catching a fire. A top ceiling of the large-space building is provided with a plurality of vertical-type smoke exhaust pipelines, smoke exhaust fans are coaxially installed in the smoke exhaust pipelines, openings of the smoke exhaust pipelines are covered with protection covers, flexible drapery cylinders are arranged in the circumference direction of the lower portions of the smoke exhaust pipelines, the upper ends of the flexible drapery cylinders are fixedly installed on the ceiling, each drapery cylinder is symmetrically provided with a plurality of pull ropes ,the lower ends of the pull ropes are fixed to the lower ends of the drapery cylinders, the upper ends of the pull ropes are tightly wound on idler wheels driven by a motor, a fire detector arranged in the large-space building is connected with a fire alarm main unit in a fire protection control center through an alarm signal line, the fire alarm main unit transmits signals to a control unit of the automatic smoke exhaust device, and the control unit is connected with an emergent power supply through a control line and is provided with an audible and visual alarm. When the fire breaks out, the device can descend the drapery cylinders to a smoke accumulation floor to exhaust smoke, the smoke exhaust effect is greatly improved, smoke diffusion speed is effectively reduced and control of smoke in the early and middle stages of the fire is facilitated.

Description

technical field [0001] The invention relates to the field of building fire protection, in particular to a smoke exhaust structure for a large-space building. Background technique [0002] According to fire statistics, smoke is the main cause of death in building fires. The proportion of people dying from smoke is relatively large, up to 80%. Most of the people who were burned to death were poisoned and fainted first. Burnt to death. Among the number of people who died in the fire, most of them died because of the suffocation reaction caused by the thick smoke. It is a necessary condition to reduce fire mortality by adopting the fastest and most effective smoke exhaust in the early stage of a fire in order to maintain the largest and longest escape space and passage in the fire scene. [0003] According to fire protection regulations, waiting areas of public transportation such as subways, airports, and railway stations, as well as large shopping malls, cinemas, and indoor ...

AI Technical Summary

Problems solved by technology

However, after a fire occurs in these large-space buildings, due to the high building height, after the smoke rises to a certain height, the buoyancy caused by the temperature difference between the smoke and the ambient air disappears at a certain height and turns negative, causing the smoke to stop rising. The horizontal expansion makes the smoke exhaust device on the top of the building unable to effectively exhaust smoke, and the smoke exhaust effect is not ideal. There are problems such as poor smoke suppression effect in the early stage of fire and low overall smoke exhaust efficiency.

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