Emergency starting and stopping device for fire damper

By using a fusible link to drive the impeller and a self-locking assembly, the fire damper achieves automatic start-stop and high-temperature self-locking, solving the problems of delayed opening and closing and high maintenance costs of traditional fire dampers during fires, and realizing efficient and reliable smoke exhaust and fire isolation functions.

CN122236859APending Publication Date: 2026-06-19SHENZHEN ELECTRIC TIGER ELECTRIC CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENZHEN ELECTRIC TIGER ELECTRIC CO LTD
Filing Date
2026-05-07
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Traditional mechanical fire dampers are prone to failure in fires, lack adaptive control logic, have delayed opening and closing, uneven opening degree, high maintenance costs, cannot achieve stable smoke exhaust and fire isolation throughout the entire cycle, and have insufficient reliability at high temperatures.

Method used

The impeller is driven by a fusible disc, and automatic start and stop are achieved by the kinetic energy of flue gas. Combined with the bellows and slide rod to drive the valve blades, the self-locking component is activated when the flue gas overheats, the valve blades are quickly reset, and the magnetic strip controls the seal. The whole mechanism is resistant to high temperature and failure, and is easy to maintain.

Benefits of technology

It achieves automatic control without electricity or manual intervention in the early stages of a fire, efficiently exhausts smoke, improves smoke stability, has high precision in opening and closing response, simplifies maintenance, reduces maintenance costs and operational difficulty, and ensures reliability throughout the entire fire cycle.

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Abstract

This invention relates to the field of fire damper technology, and more particularly to an emergency start-stop device for fire dampers, comprising a valve body and several valve blades. The valve blades are movably installed inside the valve body, and a support cylinder is fixedly installed inside the valve body. A slip ring is slidably installed inside the support cylinder; a fusible link is fixedly installed inside the slip ring; and a drive assembly. The impeller driven by flue gas rotates the drum, and the valve blades are smoothly opened by the coordinated action of a corrugated disc, a sliding rod, and a lever. This, combined with the smoke exhaust port, allows the flue gas to be discharged in a spiral pattern, reducing airflow disturbance and improving smoke exhaust efficiency and stability. The valve blades adopt a fan-shaped eccentric counterweight design, combined with a waist-shaped groove and support rod structure, ensuring smooth opening and closing and reliable sealing after closure. When the flue gas exceeds the temperature limit, the high-temperature paraffin inside the self-locking assembly expands due to heat, driving the rotating ring to reverse, and the valve blades quickly reset and close, preventing the spread of smoke and fire. Simultaneously, the overheating weakens the magnetic force of the magnetic strip, causing the sliding column to move down and block the smoke exhaust port, achieving secondary sealing and isolation.
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