JPH05151480A - Smoke detector - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a smoke detection device that can be installed without impairing the design and decorative effects in the room and that can reduce the smoke detection time. A smoke sensing device 9 according to the present invention comprises a smoke sensor 3 disposed in a ceiling 17, an air inlet 11 opened in a ceiling surface 1, the air inlet 11 and the smoke sensor. An air passage 13 connecting the air passages 3 and a fan 15 for causing the air in the air passage 13 to flow toward the smoke detector 3 side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a smoke detector for detecting smoke when a fire occurs in a building.

[0002]

2. Description of the Related Art A smoke detector for detecting smoke when a fire occurs in a building conventionally includes a smoke detector 3 mounted on a ceiling surface 1 as shown in FIG. The smoke detector 3 is connected to a power source, an alarm and a monitoring room side via the cord 5, and constitutes a part of a system for notifying that a fire has occurred in the room 7.

[0003]

However, in the conventional smoke detector, the smoke detector 3 is directly attached to the ceiling surface 1, so that the smoke detector 3 has a design and decorative effect in the room 7. Had a defect that impairs the. In order to prevent dust and insects from entering the smoke detector 3 of the smoke detector 3, if the smoke detector is covered with a net or the like, the smoke is not sensed unless it reaches the smoke detector 3 through the net or the like. It had a structure and had a problem that the detection of smoke was delayed. The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a smoke detection device that can be installed without impairing the design and decorative effects in a room, and that can reduce smoke detection time. To provide.

[0004]

To achieve the above object, the present invention provides a smoke detector arranged in a ceiling, an air inlet opening on the ceiling surface, the air inlet and the smoke sensor. And an air flow means for causing the air in the air path to flow toward the smoke detector side. Further, the present invention is characterized in that the smoke detector is housed in a box body provided in a ceiling, and the air flow means is composed of a fan provided in the box body.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a sectional view of a smoke detection device according to a first embodiment. 9 is a smoke detector, and the smoke detector 9 is a smoke detector 3 and
An air inlet 11, an air passage 13, and a fan 15 are provided. In the space above the ceiling surface 1, that is, in the ceiling 17, the box body 1
9 is installed, and the smoke sensor 3 is arranged in the box body 19. As the smoke sensor 3, various structures such as a detector including a pair of light emitting and light receiving elements can be used.

The air inlet 11 is opened in the ceiling surface 1, and the air inlet 11 and the inside of the box body 19 are air passages 1 made of tubes.
3 connected to each other, and an opening 21 of the air passage 13 to the box body 19
Is formed at a position where the air from the air passage 13 hits the smoke detector of the smoke detector 3. The fan 15 is attached to the box body 19 so that the air in the box body 19 is discharged into the ceiling 17 from the exhaust port 23, and is connected to the power source side by the cord 25. By driving the fan 15, the air in the room 7 is sucked from the air introduction port 11, the indoor air passes through the air passage 13 to hit the smoke sensing portion of the smoke sensor 3, and the air hit the smoke sensing portion is It is discharged from the outlet 23 into the ceiling 17,
In this embodiment, the fan 15 corresponds to the air flow means.

Since the smoke sensing device 9 has such a structure, it is sufficient to open a small air introduction port 11 in the ceiling surface 1, and the problem that the smoke sensor 3 is exposed to the ceiling surface 1 as in the conventional case is solved. It In addition, since the air in the chamber 7 is forcibly guided to the smoke detector 3 by the fan 15, the smoke detection time can be significantly shortened and the smoke can be detected reliably.

Although the box body 19 is provided in this embodiment, the fan 15 is provided in the air passage 13 to open the indoor air to the opening 21.
Therefore, the box body 19 can be omitted by applying the smoke detector 3 to the smoke detector. Further, when the inside of the ceiling 17 is used as a ventilation chamber or the like and has a negative pressure, the fan 15 can be omitted. In this case, the negative pressure inside the ceiling 17 corresponds to the air flow means. It will be.

Next, a second embodiment will be described with reference to FIG. The same members and parts as those in the first embodiment are designated by the same reference numerals. In the second embodiment, the fan 15 is not used, and the negative pressure of the ventilation duct 31 is used to forcibly detect the indoor air smoke. The difference is that it is led to the container 3. That is, the exhaust port 23 and the ventilation duct 31 are provided in the ceiling chamber 3
5, the indoor air is sucked from the air introduction port 11 by using the negative pressure of the ventilation duct 31, the indoor air is applied to the smoke sensing portion of the smoke sensor 3 through the air passage 13, and The air hitting the smoke sensing portion is discharged to the ventilation duct 31 through the ceiling chamber 35. In the second embodiment, the ventilation duct 31 corresponds to the air flow means.

[0010]

As is apparent from the above description, according to the present invention, the smoke detector is arranged in the ceiling, and the indoor air is forcibly guided to the smoke detector. It is possible to obtain a smoke sensing device that can be installed without impairing the decorative and decorative effects and can shorten the smoke sensing time.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a smoke detection device according to a first embodiment.

FIG. 2 is a sectional view of a smoke detection device according to a second example.

FIG. 3 is a cross-sectional view of a conventional smoke detection device.

[Explanation of symbols]

 1 Ceiling Surface 3 Smoke Detector 7 Room 9 Smoke Sensing Device 11 Air Inlet 13,35 Air Path 15 Fan 17 Ceiling 19 Box 23 Fan 31 Ventilation Duct

Claims (2)

[Claims] 1. A device for detecting smoke in a building, comprising: a smoke detector arranged in a ceiling; an air inlet opening in a ceiling surface; and the air inlet and the smoke detector. A smoke detecting device comprising: an air passage connected to the air passage; and an air flowing unit that causes air in the air passage to flow toward the smoke detector. 2. The smoke detector according to claim 1, wherein the smoke detector is housed in a box body provided in a ceiling, and the air flow means is composed of a fan provided in the box body. apparatus.