Locking device in fire damper

Abstract

A locking device in a fire damper comprises a fan-shaped lockhole plate, an actuating mechanism and a spindle of the actuating mechanism, wherein one end of the spindle of the actuating mechanism is inserted into a damper body; the fan-shaped lockhole plate and the actuating mechanism are arranged at the other end of the spindle of the actuating mechanism; a through hole is formed in the fan-shaped lockhole plate; a secondary temperature sensor is arranged on the same side as the actuating mechanism; one end of the secondary temperature sensor is arranged in the damper body; a latch in the other end of the secondary temperature sensor corresponds to the through hole formed in the fan-shaped lockhole plate; a step is arranged on the latch; a cylindrical spiral compression spring is arranged on an outer ring at the left end of the step and arranged in an inner cavity defined by a nut, a fusible plug fixing seat and a casing; and the protruding end of the latch is connected with a fusible sheet. With the adoption of the locking device, when fire happens, after the fire damper is off, a secondary temperature controller acts to lock blades of the fire damper timely when the air pipe temperature reaches a set value, so as to exert the effects of completely resisting smoke and fire. The locking device is widely applicable to nuclear power engineering and domestic and overseas construction projects with high requirements on fire resistance and smoke prevention.

Description

[0001] Technical field: [0002] The invention relates to a fire damper used in a ventilation and air conditioning duct of a building, in particular to a locking device in the fire damper. Background technique: [0003] At present, after the domestic fire damper is closed when the temperature reaches 70°C, when the air temperature in the air duct continues to rise, the transmission parts such as fire damper blades and connecting rods will produce large stress deformation under high temperature. The deformation of a certain blade will be transmitted to the main shaft of the fire damper installation actuator through its shaft, and then through the connecting rod, forcing the main shaft to rotate, and the rotation of the main shaft, due to the action of the transmission connecting rod, will cause all blades, blades and There are large gaps between the windshields and between the blade end and the blade shaft support frame, so that the fire damper loses the function of insulatin...

AI Technical Summary

Problems solved by technology

The deformation of a certain blade will be transmitted to the main shaft of the fire damper installation actuator through its shaft, and then through the connecting rod, forcing the main shaft to rotate, and the rotation of the main shaft, due to the action of the transmission connecting rod, will cause all blades, blades and There are large gaps between the windshields and between the end of the blade and the support frame of the blade shaft, so that the fire damper loses the function of preventing smoke and fire

Images