Hot smoke compound fire detector

Abstract

The invention provides a hot-smoke composite fire detector, which has a simple structure and can see the light emitted by the display lamps from all directions. The hot-smoke composite type fire detector (100) comprises: a main body base (10), a printed circuit substrate (1), a thermal element (2), a camera obscura (3), a An indicator light (4), a protective cover (30), and a rod-shaped light guide (5) for guiding light emitted by the indicator light (4) to the outside of the protective cover (30), the light guide (5) being formed through the protective cover ( The light guide through hole (35) on the 30) is provided, and one end face of the light guide (5) is opposite to the indicator light (4), and the other end face protrudes to the outside of the protective cover (30), and its protruding height is the same as that of the dark box (3). ) of the protruding height is substantially the same or higher than the protruding height of the dark box (3), and the light guide (5) is arranged opposite to the thermosensitive element (2) across the dark box (3).

Description

technical field [0001] The invention relates to a heat-smoke composite fire detector. Background technique [0002] In the past, heat-smoke composite fire detectors are usually installed on the ceiling of a room, etc., which include: a temperature detection device to detect air temperature; a smoke detection device to detect smoke in the air; and a judgment device to judge fire hazards based on these detection results. happened. Furthermore, an "indicating lamp" is also included, which blinks to inform that the combined heat and smoke detector is in a normal operating state, or lights up to inform that the combined heat and smoke detector detects a fire. [0003] In the combined heat and smoke fire detector, a printed circuit board on which a judgment device is mounted is provided on a cylindrical main body base, and a temperature detection device and a smoke detection device are provided on the printed circuit board. The temperature detection device is a heat-sensitive e...

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Problems solved by technology

[0008] In addition, in the invention disclosed in Patent Document 1, although the thermistor protrudes from the protective cover, the protruding side is covered by the protective member, and, although the protective member is in the The position of the thermistor is formed with a vent hole, but because only a part of the air (including smoke) flowing along the surface of the protective member enters the vent hole, most of it does not directly enter the vent hole, but flows along the surface of the protective member , so it is difficult to capture the air (thermal air flow) from the direction across the dark room, resulting in the inability to measure the temperature of this air well

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