Fire detector

Abstract

The invention relates to a fire detector comprising an infrared beam emitter and an infrared beam receiver. The infrared beam emitter comprises a bridge rectifier circuit, a voltage-stabilized current limiting circuit, an oscillating circuit and an infrared emitting circuit. The infrared beam receiver comprises a bridge rectifier circuit, a voltage-stabilized current limiting circuit, an oscillating circuit, an infrared receiving amplifier circuit, a trigger anti-interference circuit and an alarm circuit. Since the infrared beam emitter and the infrared beam receiver are arranged independently, a detecting chamber serves as the operating space, the monitoring range is expanded, the fire detector is particularly adaptive to mounting in large-space occasions, the alarm is more accurate by adopting the optical current, incorrect and missed alarming is avoided, energy and power are saved, and the fire detector can be connected to an existing alarm system and is convenient to use and low in cost.

Description

technical field [0001] The invention relates to a fire detector. Background technique [0002] At present, domestic common fire detectors include ionization smoke detectors, photoelectric fire detectors, and temperature detectors. The ionization smoke detector is based on the working principle of ionization. The air in two standard ionization chambers is ionized by the radiation emitted by the radioactive source to form a voltage balance bridge. When smoke particles enter, the balance of the bridge is destroyed and an alarm signal is generated. Its disadvantage is that it cannot distinguish water mist, dust and smoke; photoelectric fire detectors are divided into two types: dimming type and scattering type. , and its main disadvantage is that it cannot distinguish water mist, dust and smoke; the temperature detector uses the temperature effect of fire to work, and its main disadvantage is that it cannot distinguish the radiation of high-temperature objects from the temperat...

AI Technical Summary

Problems solved by technology

Its disadvantage is that it cannot distinguish water mist, dust and smoke; photoelectric fire detectors are divided into two types: dimming type and scattering type. , and its main disadvantage is that it cannot distinguish water mist, dust and smoke; the temperature detector uses the temperature effect of fire to work, and its main disadvantage is that it cannot distinguish the radiation of high-temperature objects from the temperature effect of smoke, resulting in false alarms and leaks. report phenomenon

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