An automatic closing device for normally open fire doors without power supply

Abstract

The invention discloses a power-free type automatic closing device for a normally-open fireproof door. The power-free type automatic closing device solves the problem that in the prior art, a door cannot be automatically closed during fires due to manual damage or circuit faults or other reasons. The power-free type automatic closing device comprises an outer cover shell installed on the wall, an automatic closing executing mechanism arranged in the outer cover shell, and a door installation seat installed on the fireproof door and matched with the automatic closing executing mechanism. The automatic closing executing mechanism comprises a piston cylinder body provided with a fixed piston rod and a constantly-moving piston rod, a lever supporting seat, a compression spring, a temperature control glass ball or a fusible alloy and a movable lever, wherein the lever supporting seat, the compression spring and the temperature control glass ball or the fusible alloy are fixed to the top of the piston cylinder body correspondingly, and the temperature control glass ball or the fusible alloy is provided with a temperature sensor and can be automatically exploded and cracked when the temperature detected by the temperature sensor reaches the preset value. The power-free type automatic closing device is simple in structure, scientific and reasonable in design, not likely to be damaged, long in service life and capable of saving cost and is hardly affected by external interference factors.

Description

Technical field [0001] The invention relates to an automatic closing device for a normally open fire door without a power source. Background technique [0002] After a fire occurs, the normally open fire door needs to be automatically closed to prevent smoke and fire, thereby gaining valuable time for escape. However, the prior art cannot automatically close the normally open fire door when it fails due to man-made damage or the electric closing system, which can easily cause the spread of fire and bring great danger to the building and the people in the building. Therefore, designing an automatic closing device for normally open fire doors without power supply has become an urgent problem for those skilled in the art. Summary of the invention [0003] The technical problem to be solved by the present invention is to provide an automatic closing device for a normally open fire door without a power source, which can automatically close the fire door after a fire occurs, thereby ac...

AI Technical Summary

Problems solved by technology

However, when the existing technology fails due to man-made damage or electric closing system, etc., the normally open fire door cannot be automatically closed, which will easily cause the spread of fire and bring great danger to the building and the people in the building.

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