DEVICE OF EMERGENCY FIRE ALARM Russian patent published in 2011 - IPC G08B17/00 G08B17/06 H01H85/00 

FIELD: fire safety.

SUBSTANCE: device comprises a heat-sensitive element, a shaper of ultrasonic oscillations, transmitting and receiving piezoacoustic transducers, an amplifier, a processing and control unit, a unit of acoustic resistance modulation of the heat-sensitive element. The heat-sensitive element made of a heat-resistant tube is filled with a fusible material (an alloy), which forms the first line of acoustic connection between the transmitting and receiving piezoacoustic transducers connected to the opposite ends of the heat-sensitive element. The second line of acoustic connection between piezoacoustic transducers is formed with the second heat-resistant tube, inside which there is a heat-sensitive element arranged longitudinally. The outlet of the acoustic resistance modulation unit in a heat-sensitive element is connected to the amplifier's outlet. The outlet of this unit by means of a thermal link is coupled with the heat-sensitive element on a section arranged between the transmitting piezoacoustic transducer and the working zone of the heat-sensitive element.

EFFECT: higher reliability of alarm.

3 cl, 2 dwg