Hot smoke composite type fire detector

Abstract

The present invention provides a hot smoke composite type fire detector having a simple structure and capable of observing the light generated by a display lamp in each direction. The hot smoke composite type fire detector (100) includes a main body base (10), a printed circuit board (1), a thermal sensitive element (2), a dark box (3), a display lamp (4) arranged on the printed circuit board (1), a protective cover (30) and a club-shaped photoconductive tube (5) for guiding the light emitted from the display lamp (4) to the outer of the protective cover (30), wherein the photoconductive tube (5) penetrates a throughhole (35) of the photoconductive tube formed on the protective cover (30), and one end face of the photoconductive tube (5) confronts the display lamp (4), the other end face is projected outside the protective cover (30), the projecting height is about identical with a projecting height of the dark box (3) or more than the projecting height of the dark box (3), moreover, the photoconductive tube (5) opposites with the thermal sensitive element (2) after an interval of 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 el...

AI Technical Summary

Problems solved by technology

[0006] However, in the invention disclosed in Patent Document 1, when the display lamp (for example, a chip-type LED) is provided on the printed circuit board, even if a viewing window is provided on the protective cover, only the display lamp and the The light of the display lamp can only be seen in a certain direction on the connecting line of the protective cover. If it deviates from this direction, it cannot be seen, so it is not convenient, and the manufacturing cost increases due to the increase in the number of components and the complexity of the structure.

[0007] On the other hand, even if the display lamp is provided to be raised (separated) from the printed circuit board, so that a part protrudes from the through hole formed on the protective cover, it is blocked by the dark room protruding from the protective cover, thereby limiting the direction that can be seen. , so there is also a lack of convenience

[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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