JP2002304678A - Fire sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire sensor allowed to be attached to the ceiling of a system by one operation by utilizing an exhaust gap or the like before the execution of ceiling plate construction and illuminating equipment construction independently of these construction and capable of allowing smoke to smoothly flow in the sensor from the lower part of the sensor to the upper part. SOLUTION: A casing 31 for the sensor having a fire phenomenon detection part and a circuit parts storing part in its inside is installed so as to be fitted to a gap 6 of the ceiling of the system, an air inflow port is formed on the lower part of the fire phenomenon detection part, an air outflow port is formed on the upper part of the detection part, and a plurality of lower passage forming wall bodies for respectively forming labyrinth passages for shielding external light are formed between the air inflow port and the detection part. Since the ventilation of air from the lower part of the detection part to the upper part can be improved and the inflow of smoke into the detection part can be smoothly executed, a fire can be quickly detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire detector for detecting a fire by utilizing heat or combustion products generated by a fire, and more particularly, to a fire detector which can be attached to a gap in a system ceiling with one touch. It is about a vessel.

[0002]

2. Description of the Related Art Conventionally, sensors for detecting a fire using heat or combustion products generated by a fire, for example, sensors such as a heat detection sensor, a smoke detection sensor, a flame detection sensor, a gas detection sensor, and an odor detection sensor are known. Detectors provided are known. These various types of fire detectors are all used by being mounted on a ceiling.

In recent years, system ceilings as shown in FIG. 12 have been widely used in high-rise buildings and the like. In this system ceiling, support brackets 1 provided side by side at predetermined intervals are suspended and supported on ceiling slabs (not shown), and a ceiling plate having a predetermined length and width is provided between the support brackets 1 and 1. The ceiling is constructed by locking 2 to construct the ceiling.

In such a system ceiling, the support fitting 1 is basically a bar having a T-shaped cross section (hereinafter referred to as a T-bar), and in some places, the distance between the support fittings is reduced to reduce the lighting fixture 3. A set of two T
The bars 4 and 5 are configured. The pair of T-bars 4 and 5 are provided with a ceiling plate 2 and a lighting fixture 3 on one of the flanges.
And the other of the flanges is arranged in abutting condition, and a gap 6 of about 25 mm is usually formed between the abutting ends of these flanges. Have been done. In addition, equipment such as a fire detector and a speaker is attached to the ceiling plate 2 in advance at a factory or a construction site.

FIG. 13 is an explanatory view showing a conventional fire detector of the exposed type mounted on the ceiling plate 2 of such a system ceiling. Here, a fire detector provided with a smoke detection sensor will be described as an example. In the figure, 7 is a ceiling plate 2
8 is a wiring for a power supply / signal line, etc., 9 is a main body of a fire detector equipped with a smoke detection sensor, and 10 is an exposed base for mounting the main body 9 to the ceiling plate 2 side. Board 2
Are fixed by fixing means (not shown) such as screws or bolts and nuts.

[0006] The exposed base 10 has a terminal portion 11 incorporated therein. The terminal portion 11 corresponds to the mounting screw 12 constituting the input / output terminal on the main body 9 side, and
It is provided at a plurality of locations around the inside of 0. 13 is a terminal plate fixed to the terminal portion 11, 14 is a terminal spring, 15 is a terminal piece, 16 is an arc-shaped claw protruding from the inner peripheral surface of the exposed base 10, and 17 is an outlet for the wiring 8. .

In the conventional fire detector of the exposed type having the above-described structure, an exposed base 10 is fixed together with a speaker (not shown) and the like to a ceiling plate 2 in a factory or a construction site in advance, and the system ceiling and the ceiling plate 2 are installed at the construction site. Incorporated in. The main body 9 of the fire detector is mounted from below the exposed base 10 to which the wiring 8 has been connected. The mounting of the main body 9 to the exposed base 10 is performed by using a flange of the mounting screw 12 and the terminal 11.
This is performed by fitting rotation with In the mounted state of the main body 9, the flange of the mounting screw 12 is clamped and held between the terminal strip 15 and the arcuate claw 16 by the elastic force of the terminal piece 15 and mounted.

FIG. 14 is an explanatory view showing an embedded type conventional fire detector attached to a ceiling plate of a system ceiling. In the figure, 21 is a main body of a fire detector provided with a smoke detection sensor, 22 is an embedded base for mounting the main body 21 on the ceiling plate 2 side, and a fixing bracket 23 is mounted on an upper surface thereof by a screw (not shown). The ceiling plate 2 is fixed to the ceiling hole 7 of the ceiling plate 2 by sandwiching the ceiling plate 2 between the fixing bracket 23 and the flange of the base 22. The mechanical and electrical coupling structure between the embedded base 22 and the main body 21 of this embedded fire detector is the same as that of the above-mentioned exposed fire detector.

In the conventional fire detector of the embedded type having the above-described configuration, an embedded base 22 is fixed together with a speaker (not shown) and the like to the ceiling panel 2 in a factory or a construction site in advance, and the ceiling base 2 is fixed together with the ceiling panel 2 at the construction site. Installed in the system ceiling. The main body 21 of the fire detector is mounted from below the embedded base 22 to which the wiring 8 has been connected. The mounting of the main body 21 on the embedded base 22 is performed in the same manner as the above-described exposed fire detector.
It is performed by fitting rotation of a flange of a mounting screw (not shown) and a terminal portion.

Japanese Patent Publication No. 48-10218 (hereinafter, referred to as a first completely embedded fire sensor), for example, is a full embedded type conventional fire detector, and Japanese Patent Publication No. 32-1637.
Japanese Unexamined Patent Publication (hereinafter referred to as a second completely buried fire detector). That is, the first completely embedded fire detector supplies air from the air supply slit provided on the ceiling surface,
Similarly, when installing a fire detector in a room that employs an air conditioning system that exhausts air from the exhaust slit provided on the ceiling surface, paying attention to the fact that negative pressure is generated behind the ceiling surface due to air conditioning, A hole was drilled, and a horn-shaped support was screwed into this hole with its opening facing the room, and the fire detector was placed at a position deeper than the ceiling of the horn-shaped support. I have. The horn-shaped support is provided with ventilation holes on the peripheral side wall so that the opening area can be adjusted, so that the air inside the room can pass through the ventilation holes from around the fire detector of the horn-shaped support and beneath the ceiling. During the flow, a part of the air can flow into a fire detector provided with a passage for passing smoke in a direction crossing the air flow, so that a fire can be detected.

The second completely buried type fire detector is provided with a fire detector integrally in an intake duct, and a hot air flow flows around the fire detector so that the fire detector is thermally activated. To make it work.

A conventional fire detector in which smoke flows from below to above in the detector is disclosed in, for example, Japanese Patent Laid-Open No. 522-2 / 1982.
No. 2979 (hereinafter referred to as vertical flow path type fire detector)
There are the following. This vertical channel fire detector
Holes are drilled in the bottom and top walls of the sensor box to allow smoke to flow upward from below through the box, and to form a dark box inside the box, so that light from the room is easy to enter. The wall hole (inflow hole) is covered with a funnel-shaped cover or the back surface of the parabolic mirror of the light emitting unit in the box so that incident light does not affect the light receiving unit. Then, by detecting that the light of the light projecting portion is scattered by the fine particles of smoke in the dark box thus configured, a fire can be detected.

[0013]

However, a ceiling hole 7 is formed in the ceiling plate 2 and the base 10 or 2 is formed in the ceiling hole 7.
2 and fix the main body 9 or 2 through the base 10 or 22.
In the case of a conventional fire detector of an exposed type or a buried type in which the fire detector 1 is mounted, a ceiling hole 7 for mounting a base is formed in the ceiling plate 2 when a fire detector is to be added later by changing a layout. It has to be set up and is very troublesome.

[0014] The first completely embedded fire detector of the prior art has a hole for mounting a horn-shaped support on the ceiling surface, similarly to the above-mentioned exposed or embedded fire detector. The air flow in the room basically flows from around the fire detector of the horn-shaped support through the ventilation holes to the back side of the ceiling surface. There is a drawback that the smoke does not flow smoothly into the fire detector provided with the smoke passage in the crossing direction, and it takes time to detect the fire.

In addition, these conventional exposure type, embedded type, first type
All of the conventional fire detectors that are completely embedded can be installed on the ceiling panel, so they cannot be installed earlier than ceiling panel construction and lighting equipment construction, and additional fire detectors became unnecessary and were removed In this case, there is a problem that a hole is formed in the ceiling plate. Furthermore, smoke can be detected only when it is placed in a horizontal airflow.
The shape must be circular so as to allow 60 °, and there is a limit in the freedom of the shape.

Further, the conventional second completely buried type fire detector is provided with the fire detector integrally in the intake duct, so that not only the cost is high but also there are various restrictions such as an installation place. Furthermore, since the fire detector is operated in a thermally responsive manner by the flow of hot air flowing around the fire detector, it cannot be applied to fire detectors other than the heat detection method. is there.

Further, the conventional vertical flow path type fire detector basically does not shield the top wall hole (outflow hole) of the detector box from light, and therefore, the light from the top wall hole is blocked. The top wall hole cannot be made large to suppress the incidence, which impedes the flow of air inside the sensor box, makes it difficult for smoke to flow into the sensor box, and takes time to detect fire. .

The present invention focuses on the points described above and the fact that there is a gap in the system ceiling due to, for example, a support bracket for supporting the ceiling plate. First, it is intended to obtain a fire detector that can be attached to the system ceiling with one touch by using this gap, for example, an exhaust gap, and that allows smoke to flow smoothly from bottom to top inside the detector. And

[0019]

According to a first aspect of the present invention, there is provided a fire detector which can be mounted in a gap in a ceiling of a system and has a fire detector and a circuit component storage inside. An air inlet provided at a lower portion or a lower side portion of the fire phenomenon detecting section in the housing.

Further, the fire detector according to the second invention of the present invention is provided with an air outlet at an upper portion of a fire phenomenon detecting section in a housing.

Further, in the fire detector according to the third invention of the present invention, the housing is provided with a rectangular parallelepiped embedding portion located in a gap of the system ceiling, and provided continuously with the embedding portion. And a projecting portion projecting downward from the gap.

A fire detector according to a fourth aspect of the present invention is provided with a locking member at a top or upper side of a housing for a gap in a system ceiling.

A fire detector according to a fifth aspect of the present invention can be mounted in a gap in a system ceiling, and has a housing having a fire phenomenon detecting section and a circuit component storage section therein, An air inlet provided at a lower portion of the fire event detector, a plurality of lower passage forming walls forming a labyrinth passage between the air inlet and the fire event detector for blocking external light, And an air outlet provided on the housing above the fire phenomenon detecting section.

Further, in the fire detector according to the sixth aspect of the present invention, the housing is configured to be a completely embedded type including an embedded portion which is entirely mounted in a gap in a system ceiling.

Further, in the fire detector according to the seventh aspect of the present invention, the housing is provided with an embedded portion to be mounted in a gap in the system ceiling, and the width of the embedded portion is set smaller than the gap. And a protruding portion provided from the lower portion to a position lower than the ceiling surface.

Further, in the fire detector according to the eighth aspect of the present invention, both the fire phenomenon detection section and the circuit component storage section in the housing are set so as to straddle the embedded section and the projecting section. Things.

Further, in the fire detector according to the ninth aspect of the present invention, the fire phenomenon detecting section in the housing is set from one side of the embedded section to the entire area of the projecting section, and the circuit component storage section is provided. This is set on the other side of the embedding part.

In the fire detector according to the tenth aspect of the present invention, the air inlet is provided on the bottom wall of the fire phenomenon detecting section in the housing.

In the fire detector according to the eleventh aspect of the present invention, the air inlet is provided on the lower peripheral side wall and the bottom wall of the fire phenomenon detecting section in the housing.

In the fire detector according to a twelfth aspect of the present invention, the lower passage-forming wall is formed of a first lower passage-forming wall group corresponding to the air inlet on the lower peripheral side wall and a bottom wall. And a second lower passage forming wall group corresponding to the air inlet.

Further, in the fire detector according to the thirteenth aspect of the present invention, the air outlet is provided on the top wall of the fire phenomenon detecting section in the housing.

Further, in the fire detector according to the fourteenth aspect of the present invention, the air outlet is provided on the upper side wall and the top wall of the fire phenomenon detecting portion in the housing.

A fire detector according to a fifteenth aspect of the present invention is characterized in that a plurality of upper passage-forming walls forming a labyrinth passage for shielding external light between the air outlet and the fire phenomenon detecting section. Is provided.

[0034] In the fire detector according to a sixteenth aspect of the present invention, the upper passage-forming wall is composed of a first upper passage-forming wall group corresponding to an air outlet of the upper side wall and an air on the top wall. And a second upper passage forming wall group corresponding to the outlet.

[0035]

According to the first aspect of the present invention, since the housing of the sensor is constructed so as to be mountable in a gap between the system ceilings, regardless of the ceiling panel work or the lighting equipment work, it is more effective than these works. First, the mounting of the sensor is completed only by mounting the housing of the sensor in the gap of the system ceiling from the indoor side. In addition, since an air inlet is provided at the lower or lower side of the fire event detection unit, smoke in ascending airflow and smoke in horizontal airflow on the ceiling surface are detected by heat generated during a fire. It can flow into the part.

Further, in the second aspect of the present invention, since the air outlet is provided above the fire phenomenon detecting section in the housing, the rising airflow due to the heat at the time of the fire smoothly passes through the inside of the fire phenomenon detecting section. This allows a fire to be detected quickly.

According to the third aspect of the present invention, the housing is provided with a rectangular parallelepiped embedding portion located in the gap of the system ceiling, and provided continuously with the embedding portion and below the gap. The sensor is located at a glance, making it easy to maintain and manage.
The protrusion to the indoor part can be suppressed thinly.

According to the fourth aspect of the present invention, the locking member provided on the upper or upper side of the casing engages with the gap when the casing is inserted into the gap in the system ceiling. Since the body is fixed, the housing can be securely attached to the gap in the system ceiling with one touch.

Further, in the fifth invention of the present invention, regardless of the ceiling panel construction and the lighting fixture construction, it is only necessary to mount the sensor housing in the gap of the system ceiling prior to these constructions. Installation is completed. Further, an air inlet is provided below the fire event detection unit, and an air outlet is provided above the fire event detection unit. A labyrinth for blocking external light between the air outlet and the fire event detection unit. Since multiple walls that form the passage are installed, each mouth can be set large,
The flow of air from the lower part to the upper part of the fire phenomenon detection part is improved, and the smoke flows into the fire phenomenon detection part smoothly, so that the fire can be detected quickly.

Further, in the sixth aspect of the present invention, since the housing is formed as a completely embedded type including an embedded portion which is entirely mounted in a gap in the system ceiling, the housing is located below the ceiling surface. The sprinkler does not protrude, the mounting state is not obstructive, the object does not collide and is not damaged, and even if the sprinkler accidentally goes aside, it does not get wet and the sensitivity does not decrease.

In the seventh aspect of the present invention, the housing is provided with an embedding portion to be mounted in a gap in the system ceiling, and a width smaller than the gap, and a ceiling surface extending from a lower portion of the embedding portion. Because it consisted of a protruding part that was provided below
The installation location of the sensor can be understood at a glance, making maintenance and management easy, and protruding into the room can be suppressed.

In the eighth aspect of the present invention, both the fire phenomenon detecting section and the circuit component storage section in the housing are set so as to straddle the embedded section and the projecting section. By arranging a printed circuit board on which circuit elements are mounted in the circuit component storage section in the vertical direction, a protrusion can be formed without increasing the height of the housing.

In the ninth aspect of the present invention, the fire detection section in the housing is set from one side of the embedding section to the entire area of the protruding section, and the circuit component accommodating section is provided in the embedding section. It is set on the other side. In this case, if the printed circuit board on which the circuit elements are mounted is arranged in the circuit component storage portion in the horizontal direction, the height of the housing can be reduced, and the air inlet Can be set larger, and the amount of smoke flowing into the fire phenomenon detecting section can be increased.

In the tenth aspect of the present invention,
Since the air inlet is provided on the bottom wall of the fire event detection unit in the housing, the smoke in the rising airflow guided to the gap in the system ceiling can flow straight into the fire event detection unit.

In the eleventh invention of the present invention,
The air inlets are provided on the lower peripheral side wall and bottom wall of the fire detector in the housing, so that not only smoke in the updraft flowing into the gap between the system ceiling but also in the horizontal airflow on the ceiling surface is fired. It can flow into the phenomenon detection section.

In the twelfth aspect of the present invention,
The lower passage forming wall is composed of a first lower passage forming wall group corresponding to the air inlet of the lower peripheral side wall and a second lower passage forming wall group corresponding to the air inlet of the bottom wall. So
Light can be shielded while increasing the size of the air inlet.

In a thirteenth aspect of the present invention,
The air outlet is provided on the top wall of the fire detection unit in the housing, so that the rising airflow due to the heat of the fire can pass through the fire detection unit smoothly, and the sensor is installed in the gap in the system ceiling. Smoke can flow into the vessel without resistance.

In the fourteenth aspect of the present invention,
Since the air outlet is provided on the upper side wall and the top wall of the fire phenomenon detection unit in the housing, the passage of the rising airflow due to the heat at the time of the fire in the fire phenomenon detection unit is performed more smoothly.

In the fifteenth aspect of the present invention,
Since a plurality of upper passage forming walls that form a labyrinth passage for blocking external light are provided between the air outlet and the fire phenomenon detection unit, light can be shielded while the air outlet is enlarged.

In the sixteenth aspect of the present invention,
Since the upper passage forming wall is composed of the first upper passage forming wall group corresponding to the air outlet on the upper side wall and the second upper passage forming wall group corresponding to the air outlet on the top wall. In addition, it is possible to shield the light while increasing the size of the air outlet, and it is possible to more smoothly pass the rising airflow caused by heat at the time of fire in the fire phenomenon detection unit.

[0051]

[Embodiment 1] Hereinafter, the present invention will be described with reference to the illustrated embodiments. FIG. 1 is a front view showing a state in which a fire detector according to a first embodiment of the present invention is mounted on a system ceiling, FIG. 2 is a plan view thereof, FIG. FIG. 5 is a vertical cross-sectional view as viewed from the front side, and FIG. 5 is a horizontal cross-sectional view as viewed from the upper side. In each figure, parts corresponding to those in the related art are denoted by the same reference numerals. Here, a fire detector provided with a smoke detection sensor will be described as an example. In each figure,
Reference numeral 31 denotes a complete embedding portion having a width attachable between a pair of T-bars 4 and 5 serving as support brackets for the system ceiling, and an entire embedding portion disposed on the back side of the exhaust gap 6. Type fire detector housing, flanges 4a, 5a of T-bars 4, 5
It is installed over the top. 32a and 32b are housing fixing leaf springs having one ends fixed to both side surfaces of the housing 31 and the other ends elastically engaged with the upper ends of the webs 4b and 5b of the T bars 4 and 5, respectively. The inside of the housing 31 is defined by a fire event detection unit 33 and a circuit component storage unit 34.

The lower part of the fire detector 33, that is, the housing 3
An air inlet 36 is provided in the bottom wall 35 immediately below the fire event detection unit, and a labyrinth passage for blocking external light is formed between the air inlet 36 and the fire event detection unit 33. A plurality of lower passage forming walls 37
Is arranged. Moreover, the upper part of the fire phenomenon detection part 33,
That is, an air outlet 39 is provided at a position immediately above the fire phenomenon detection unit on the top wall 38 of the housing 31, and a labyrinth for blocking external light is provided between the air outlet 39 and the fire phenomenon detection unit 33. A plurality of upper passage forming walls 40 forming a passage are arranged. Therefore, the fire phenomenon detection unit 33 is configured as a dark box surrounded by the lower passage forming wall 37, the upper passage forming wall 40, and the inner wall of the housing 31. A light projecting element 41 and a light receiving element 42 are mounted in the dark box.
Are separated by a light-shielding column 43 so that the light-receiving element 42 does not receive the light from the light-emitting element 41 in a normal state where no fire occurs.

A printed circuit board 45 on which a number of circuit elements 44 such as a light emitting circuit, an amplifier circuit, and a switching circuit are mounted is housed in the circuit component housing section 34 in a vertical direction. , 42 are connected, and the wiring of the power supply and signal lines for the fire alarm equipment (not shown) provided on the back side of the system ceiling and the printed circuit board 45 are connected to the lead wires 46 and the connectors 47.
Is connected directly.

The fire detector according to the present embodiment having the above-described structure has a casing 31 having an exhaust gap from above the system ceiling until the lower surface thereof contacts the upper surfaces of the flanges 4a and 5a of the T-bars 4 and 5. 6, the distal ends of the leaf springs 32a, 32b are connected to the webs 4b,
5b is engaged over the upper end, and the lower surface of the housing 31 is
Engaging with the upper surfaces of the flanges 4a and 5a of the bars 4 and 5, the housing 31 is fixed and mounted in a gap in the system ceiling. The lead wires 46 may be connected before or after the housing 31 is attached to the exhaust gap 6 in the system ceiling, and can be easily connected by the connector 47.

Now, when a fire occurs indoors, combustion products (hereinafter referred to as smoke) rise in the rising airflow due to the heat at the time of the fire, and are sucked into the exhaust gap 6 in the system ceiling. At this time, the smoke rising toward the exhaust gap 6 at the portion where the fire detector of the present embodiment is installed flows directly into the air inlet 36 without resistance, and is formed by the lower passage forming wall 37. It rises and passes through the labyrinth passage and flows into the dark box which is the fire phenomenon detecting section 33. The smoke that has flowed into the dark box further rises and passes through the labyrinth passage formed by the upper passage forming wall 40 and flows out from the air outlet 39 to the rear side of the system ceiling. Since smoke is forcibly and continuously sucked into the exhaust gap 6, the inflow of smoke into the dark box as described above is also continuously performed. On the other hand, the light emitting element 41 in the dark box is
The pulse is lit periodically. And the light emitting element 41
Is scattered by the inflowing smoke, and the light receiving element 42 detects the scattered light. The detection signal of the light receiving element 42 is amplified, and when the smoke density exceeds the set value, the switching circuit is operated. The output of the switching circuit is sent to a receiver (not shown) via a lead wire 46 to indicate a fire area and to sound an alarm to notify the occurrence of a fire.

Further, if the casing 31 attached to the exhaust gap 6 on the system ceiling is pulled out above the space between the T bars 4 and 5, the casing 31 can be easily removed from the exhaust gap 6. Then, if the removed housing 31 is disassembled, a continuity test and a component replacement of the circuit element 44 mounted on the printed circuit board 45 can be performed.

As described above, the fire detector according to the present embodiment includes the vertical flow path type fire phenomenon detection unit 3 in the completely embedded housing 31.
3, the housing 31 is inserted into the exhaust gap 6 from above, between the T-bars 4 and 5 of the system ceiling, regardless of ceiling panel work or lighting fixture work. Just push in and complete the installation. For this reason, the work of perforating the ceiling plate 2 as in the related art is not required, and the construction is facilitated. Furthermore, since it is a completely embedded type, the housing 31 does not protrude downward from the ceiling surface, the mounting state is not obstructive, there is no damage due to collision of objects, and sprinklers are erroneously exploded beside. Even if it gets wet, the sensitivity does not drop.

Further, an air inlet 36 is provided below the fire event detector 33, and an air outlet 3 is provided above the fire event detector 33.
9 are provided, and a plurality of walls 37 and 40 forming labyrinth passages for shielding external light are provided between the mouths 36 and 39 and the fire phenomenon detection unit 33, respectively. The parts 36 and 39 can be set large, the air flow from the lower part to the upper part of the fire phenomenon detection part 33 is improved, the smoke flows into the fire phenomenon detection part smoothly, and the fire can be detected quickly. it can.

Further, the housing 31 is installed in the exhaust gap 6 on the system ceiling, and the fire phenomenon detecting section 33 is placed in the one-way airflow, so that smoke when a fire occurs continuously passes through the fire phenomenon detecting section. Therefore, it is not necessary to provide the fire detector with a sampling function, so that an automatic sampling type fire detector can be provided.

Further, even when the air conditioner is stopped, such as at night, the air flow passes through the fire phenomenon detecting section 33 due to the rising force of the hot air flow of the fire, so that the fire can be detected quickly.

The exhaust gap 6 is formed by a pair of T-bars 4, 5 (support fittings) flanges 4 a, 5 a supporting the ceiling plate 2 of the system ceiling, and the housing 31 is formed of the flange 4.
a, 5a, so that not only the mounting base is not required, but also the fire detector can be mounted at an arbitrary position along the exhaust gap 6, and the installation position can be reduced. If the change becomes inappropriate, the position can be easily changed and efficient installation can be performed.

Embodiment 2 FIG. FIG. 6 is a vertical sectional view of the fire detector according to the second embodiment of the present invention viewed from the side, and FIG. 7 is a vertical sectional view of the fire detector viewed from the front side. The same reference numerals are given to the same parts. In this embodiment, a protruding portion 51 which is set to have a width smaller than the interval of the exhaust gap and hangs downward from the ceiling surface is provided at a position immediately below the fire phenomenon detecting portion on the bottom wall 35 of the housing 31. The protrusion 51 has an air inlet 5 on its peripheral side wall and bottom wall, respectively.
2 and 53, air outlets 39 and 54 are formed on the top wall 38 of the housing 31 just above the fire event detection unit and on both side walls, respectively.
A first upper passage forming wall group 55 corresponding to the air outlet 54 on the upper side wall, and a second upper wall forming wall group 55 corresponding to the air outlet 39 on the top wall.
And the upper passage forming wall group 40 of
Other configurations are the same as those in the first embodiment.

In this embodiment, since the protruding portion 51 protrudes into the room, the installation location of the fire detector can be recognized at a glance, thereby facilitating maintenance and management and suppressing the protrusion to the indoor portion to be thin. it can.

The projecting portion 51 has air inlets 52 and 53 formed on its peripheral side wall and bottom wall, respectively.
Not only the smoke in the rising airflow guided to the exhaust gap in the system ceiling, but also the smoke in the horizontal airflow on the ceiling surface can flow into the fire phenomenon detection unit.

The air outlets 3 are provided on the top wall 38 of the housing 31 just above the fire event detection section and on both side walls, respectively.
By forming 9, 54, the fluidity of the smoke is improved, and the rising airflow due to the heat at the time of the fire can pass more smoothly through the fire phenomenon detecting section.

Also, the upper passage forming wall is formed by a first upper passage forming wall group 55 corresponding to the air outlet of the upper side wall.
Since it is composed of the second upper passage forming wall group 40 corresponding to the air outlet of the top wall, light can be shielded while the air outlet is enlarged.

Embodiment 3 FIG. FIG. 8 is a vertical sectional view of the fire detector according to the third embodiment of the present invention viewed from the side, and FIG. 9 is a vertical sectional view of the fire detector viewed from the front, corresponding to the first embodiment. The same reference numerals are given to the same parts. According to this embodiment, a fire phenomenon detection unit 33 defined inside a housing 31 is used.
And the circuit component storage portion 34, the gap between the embedded portion 61 mounted on the back surface of the exhaust space of the support bracket on the system ceiling, that is, the upper surface of the flanges 4a, 5a of the T-bars 4, 5, and the space between the exhaust space. And a projection 62 which is set to have a width smaller than that of the embedding portion 61 and is provided below the ceiling surface so as to hang down below the ceiling surface. The leaf springs 63a and 63b to be fixed have their base ends fixed to the upper surface of the housing 31, and further, the air inlets 64 and 65 are provided on the lower side wall and the bottom wall of the protruding portion 62 on the fire event detecting section 33 side, respectively. And a first lower passage forming wall group 66 corresponding to the air inlets 64 in the lower side wall and an air inlet 65 in the bottom wall.
And the second lower passage-forming wall group 67 corresponding to the first and second passages. Further, a printed circuit board 45 on which the circuit element 44 is mounted is vertically arranged in the circuit component storage section 34 so as to straddle the embedded section 61 and the protruding section 62. Is the same as in the first and second embodiments.

In this embodiment, each of the fire phenomenon detecting section 33 and the circuit component storage section 34 defined inside the housing 31 is composed of an embedded section 61 and a projecting section 62. The air inlets 64 and 65 are formed in the lower side wall and the bottom wall of the protrusion 33 on the side of the protrusion 62, and the circuit element 44 is straddled between the embedded portion 61 and the protrusion 62 in the circuit component storage 34. Since the mounted printed circuit board 45 is arranged in the vertical direction, it is possible to improve the fluidity of the smoke in the fire phenomenon detection unit 33 while keeping the height of the housing 31 the same as that of the first embodiment.

Further, the lower passage forming wall group is formed by a first lower passage forming wall group 66 corresponding to the air inlet 64 of the lower side wall.
And the second lower passage forming wall group 67 corresponding to the air inlet 65 on the bottom wall, it is possible to shield the light while increasing the size of the air inlet.

Embodiment 4 FIG. FIG. 10 is a vertical sectional view of a fire detector according to a fourth embodiment of the present invention as viewed from the side, and FIG. 11 is a vertical sectional view as viewed from the front side thereof.
Are given the same reference numerals. In this embodiment, the housing 31 is attached to the back of the exhaust gap of the support bracket on the system ceiling, that is, the flanges 4a, 5 of the T-bars 4, 5.
and a protruding portion 72 which is set to have a width smaller than the space of the exhaust gap and is provided below the embedding portion 71 and provided below the ceiling surface. And a fire phenomenon detection unit 33 defined in the housing 31.
Is set from one side of the embedding portion 71 to the entire area of the protruding portion 72 (also present below the embedding portion 71), and the circuit component storage portion 34 is set on the other side of the embedding portion 71, Printed circuit board 4 on which circuit element 44 is mounted in component storage section 34
5 are arranged laterally. A leaf spring 73a for engaging the housing 31 with the webs 4b, 5b of the T bars 4, 5 is provided.
73b is formed by bending an engagement portion with the webs 4b and 5b in an inverted U-shape, and has a base end fixed to the upper surface of the housing 31. In addition, air inlets 74 and 75 similar to those in the above-described third embodiment are formed in the lower side wall and the bottom wall of the fire phenomenon detecting unit 33 on the protruding portion 72 side.
Air inlets 76 and 77 are also formed on both end walls of the protrusion 72. In addition, the lower passage forming wall is formed of a first lower passage forming wall group 78 corresponding to the air inlets 74, 76, 77 on the lower peripheral side wall, and a second lower passage forming wall group 78 corresponding to the bottom wall.
And the lower passage forming wall group 79 of FIG.
Other configurations are the same as those of the third embodiment.

In this embodiment, the circuit component storage 3
4 and the printed circuit board 45 is arranged in the horizontal direction.
The fire detection unit 33 is inserted from one side of the embedding unit 71 into the embedding unit 71.
The air inlets 74, 75, 76, 77 are provided on the lower peripheral side wall and the bottom wall of the protruding portion 72.
Is formed, it is possible to improve the fluidity of the smoke in the fire phenomenon detection unit 33 while compressing the height of the housing.

Further, the lower passage forming wall is formed by a first lower passage forming wall group 78 corresponding to the air inlets 74, 76, 77 on the lower peripheral side wall and a first lower passage forming wall group 78 corresponding to the bottom wall. Since it is composed of the two lower passage forming wall groups 79, light can be shielded while the air inlet is further enlarged.

In each of the above embodiments, the housing 31 of the fire detector is connected to the pair of T-bars 4 on the system ceiling.
In order to be mounted in the exhaust gap 6 formed by 5, the mounting is performed from above the pair of T-bars 4, 5, that is, from above the ceiling. However, the fire detector may be attached to the exhaust gap 6 on the ceiling of the system from below the exhaust gap 6, that is, from the indoor side.

This will be described in more detail with reference to FIGS. 8 and 9, which are used in the third embodiment.
2, the widths of the flanges 4a, 5
The width of the embedded space 61 as shown in FIG. 9 is set to be smaller than the width of the exhaust gap 6 as well as being wider than the width of the exhaust gap 6 of the system ceiling formed by a. And the embedding part 61
One end of each elastic piece for locking, which is formed of a leaf spring having a U-shaped cross section, is fixed to each side wall, and the other end is provided to be extendable.

With this configuration, the housing 31
Of the system ceiling from the room side
When the housing 31 is inserted into the housing 31, the steps of the embedded portion 61 and the protruding portion 62 abut against the flanges 4 a and 5 a of the T bars 4 and 5.
At this time, the elastic pieces provided on both side walls of the embedding portion 61 temporarily narrow when passing through the exhaust gap 6 formed by the flanges 4a and 5a, and then expand after passing through the webs 4b and 5 of the T bars 4 and 5.
b. As a result, the fire detector is fixed with the housing 31 attached to the exhaust gap 6 on the system ceiling.

When the fire detector is detached for maintenance and inspection or movement, the elastic piece is narrowed by pulling the protrusion 62 of the housing 31 downward (inside the room), thereby narrowing the evacuation gap 6. The embedding part 61 can be pulled out of the embedment.

In each of the above embodiments, the case where the gap in the system ceiling is an exhaust gap has been described. However, it is needless to say that the present invention can be applied to the case where the gap in the system ceiling is not used for exhaust. No.
In this case, the structure of the fire detector may be the same as the structure of each of the above-described embodiments, but the air flow passing through the ceiling is smaller than that in the case where the air is exhausted. The outlet and the upper passage forming wall group may be omitted.

[0078]

As described above, according to the first aspect of the present invention, the housing of the sensor is set so as to be mountable in the gap between the system ceilings. Prior to these works, the casing of the sensor can be attached to the gap in the ceiling of the system from the room side with a single touch. In addition, since an air inlet is provided at the lower or lower side of the fire phenomenon detection unit, smoke in the rising airflow and smoke in the horizontal airflow on the ceiling surface are detected by the heat of the fire. It can flow into the part. Further, according to the second aspect of the present invention, since the air outlet is provided above the fire phenomenon detection unit in the housing, the rising airflow due to heat at the time of fire can smoothly pass through the fire phenomenon detection unit. This allows a fire to be detected quickly. Further, according to the third aspect of the present invention, the housing is provided with a rectangular parallelepiped embedding portion located in the gap of the system ceiling, and provided continuously with the embedding portion and protruding downward from the gap. Since it is configured with the protruding portion, the installation location of the sensor can be recognized at a glance, maintenance and management are easy, and the protrusion to the indoor part can be suppressed thinly. Also,
According to the fourth aspect of the present invention, since the locking member for the gap in the system ceiling is provided on the upper or upper side of the housing, the housing can be securely mounted in the gap in the system ceiling with one touch. Can be. Further, according to the fifth aspect of the present invention, since the housing of the sensor is set so as to be mountable in the gap in the system ceiling, regardless of ceiling panel construction or lighting fixture construction,
Prior to these works, the sensor housing can be attached to the gap in the system ceiling with a single touch. A labyrinth passage for shielding external light between the air outlet and the fire event detector is provided with an air inlet below the fire event detector and an air outlet above the fire event detector. Since the plurality of lower passage-forming walls that form the above are installed, each opening can be set large, and the air flow from the lower part to the upper part of the fire phenomenon detecting unit is improved, thereby achieving the same effect as in the second invention. The smoke can smoothly flow into the fire detection section, and the fire can be quickly detected. Further, according to the sixth aspect of the present invention, since the housing is configured as a completely embedded type including an embedded portion which is entirely mounted in a gap in the system ceiling, the housing projects downward from the ceiling surface. Therefore, the mounting state is not obstructive, the object does not collide and is not damaged, and the sprinkler does not get wet even if the sprinkler erroneously erupts aside, thereby preventing a decrease in sensitivity due to the eruption. According to the seventh aspect of the present invention,
The housing is composed of an embedded portion to be mounted in a gap in the system ceiling, and a protruding portion which is set to have a smaller width than the gap and is provided from the lower portion of the embedded portion and provided below the ceiling surface. Therefore, similarly to the third invention, the installation location of the sensor can be recognized at a glance, maintenance and management are easy, and the protrusion to the indoor part can be suppressed. Also, the eighth aspect of the present invention.
According to the invention of the above, since the fire phenomenon detection section and the circuit component storage section in the housing are both set so as to straddle the embedded section and the projecting section, for example, the printed circuit board is vertically inserted in the circuit component storage section. In this case, the protrusion can be formed without increasing the height of the housing. Further, according to the ninth aspect of the present invention, the fire phenomenon detecting section in the housing is set from one side of the embedded section to the entire area of the protruding section, and the circuit component storage section is connected to the other side of the embedded section. Therefore, for example, if the printed circuit board is arranged in the horizontal direction in the circuit component storage section, the height of the housing can be reduced, and the air inlet can be set larger. The inflow can be increased. Further, according to the tenth aspect of the present invention, since the air inlet is provided on the bottom wall of the fire event detection section in the housing, the smoke in the rising airflow guided to the gap in the system ceiling is straightened. It can flow into the detection unit. Further, according to the eleventh aspect of the present invention, since the air inlet is provided on the lower peripheral side wall and the bottom wall of the fire event detection unit in the housing, only the smoke in the rising airflow guided to the gap in the system ceiling is provided. In addition, smoke in the horizontal airflow on the ceiling surface can also flow into the fire phenomenon detection unit. Also,
According to the twelfth aspect of the present invention, the lower passage forming wall is
Since it is composed of the first lower passage forming wall group corresponding to the air inlet on the lower peripheral side wall and the second lower passage forming wall group corresponding to the air inlet on the bottom wall, the air inlet is enlarged. The light can be shielded while the light is blocked. Further, according to the thirteenth aspect of the present invention, the air outlet is provided on the top wall of the fire phenomenon detecting section in the housing, so that the rising airflow due to the heat at the time of the fire smoothly passes through the inside of the fire phenomenon detecting section. This allows smoke to flow into the sensor installed in the gap in the ceiling of the system without resistance. Further, according to the fourteenth aspect of the present invention, since the air outlet is provided on the upper side wall and the top wall of the fire phenomenon detection unit in the housing, the passage of the rising airflow due to the heat at the time of the fire in the fire phenomenon detection unit. Is performed more smoothly. Further, according to the fifteenth aspect of the present invention, since a plurality of upper passage forming walls for forming a labyrinth passage for shielding external light are provided between the air outlet and the fire phenomenon detection unit, Light can be shielded while the outlet is enlarged. Further, according to the sixteenth aspect of the present invention, the upper passage forming wall is provided with the first passage corresponding to the air outlet of the upper side wall.
, And the second upper passage-forming wall group corresponding to the air outlet of the top wall, it is possible to shield the light while increasing the size of the air outlet, and It is possible to more smoothly pass the rising airflow due to the heat in the fire phenomenon detecting section.

[Brief description of the drawings]

FIG. 1 is a front view showing a state where a fire detector according to a first embodiment of the present invention is mounted on a system ceiling.

FIG. 2 is a plan view of FIG.

FIG. 3 is a longitudinal sectional view as viewed from a side surface of FIG. 1;

FIG. 4 is a longitudinal sectional view as viewed from the front side in FIG. 1;

FIG. 5 is a cross-sectional view as viewed from the upper surface side of FIG.

FIG. 6 is a longitudinal sectional view of a fire detector according to a second embodiment of the present invention as viewed from a side.

FIG. 7 is a longitudinal sectional view as viewed from the front side in FIG. 6;

FIG. 8 is a longitudinal sectional view of a fire detector according to a third embodiment of the present invention as viewed from a side.

9 is a longitudinal sectional view as viewed from the front side in FIG.

FIG. 10 is a longitudinal sectional view of a fire detector according to a fourth embodiment of the present invention as viewed from a side.

11 is a longitudinal sectional view as viewed from the front side in FIG.

FIG. 12 is an explanatory diagram of a system ceiling.

FIG. 13 is an explanatory diagram showing a state in which a conventional exposed fire detector is attached to a ceiling plate.

FIG. 14 is an explanatory view showing a state in which a conventional embedded fire detector is attached to a ceiling plate.

[Explanation of symbols]

6 Exhaust Gap (Gap) 31 Housing 33 Fire Phenomenon Detection Unit 34 Circuit Component Storage 35 Bottom Wall 36,52,53,64,65,74,75,76,7
7 air inlet 37 lower passage forming wall 38 top wall 39,54 air outlet 40 upper passage forming wall (second upper passage forming wall group) 51,62,72 projecting portion 55 first upper passage forming Wall group 61, 71 Embedding part 66, 78 First lower passage forming wall group 67, 79 Second lower passage forming wall group

[Procedure amendment]

[Submission Date] April 25, 2002 (2002.4.2
5)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

[0019]

According to a first aspect of the present invention, there is provided a fire detector which is mounted on a ceiling of a system and mounted in a housing.
A printed circuit board on which circuit elements are mounted is housed in a vertical direction .

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction contents]

Further, the fire detector according to the second aspect of the present invention can be mounted in a gap in the ceiling of the system and has a fire phenomenon inside.
A housing having a detection unit and a circuit component storage unit;
An embedding part to be mounted in a gap in a system ceiling, and the embedding part
Projecting part hanging down from the lower part of the part below the ceiling surface
It consists of and .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction contents]

Further, in the fire detector according to claim 3 of the present invention, the fire phenomenon detecting section is constituted by an embedded section and a projecting section .

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

In the fire detector according to a fourth aspect of the present invention, the air inlet is formed on a side wall of the protruding portion .

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0023

[Correction method] Change

[Correction contents]

A fire detector according to a fifth aspect of the present invention is mounted in an exhaust gap on a system ceiling .

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0024

[Correction method] Deleted

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0025

[Correction method] Deleted

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Deleted

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0027

[Correction method] Deleted

[Procedure amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Deleted

[Procedure amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0029

[Correction method] Deleted

[Procedure amendment 13]

[Document name to be amended] Statement

[Correction target item name] 0030

[Correction method] Deleted

[Procedure amendment 14]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Deleted

[Procedure amendment 15]

[Document name to be amended] Statement

[Correction target item name] 0032

[Correction method] Deleted

[Procedure amendment 16]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Deleted

[Procedure amendment 17]

[Document name to be amended] Statement

[Correction target item name] 0034

[Correction method] Deleted

[Procedure amendment 18]

[Document name to be amended] Statement

[Correction target item name] 0035

[Correction method] Change

[Correction contents]

[0035]

According to the first aspect of the present invention, the system ceiling
Printed circuit board with circuit elements mounted inside the housing in the mounted state
The case is housed vertically so that the housing is
It can be easily installed in the gap in the ceiling .

[Procedure amendment 19]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction contents]

According to the second aspect of the present invention, the detector
Is configured so that it can be installed in the gap in the system ceiling.
Irrespective of ceiling panel construction and lighting equipment construction,
Prior to these works, the sensor housing must be
The installation is completed simply by mounting it from inside the room. Change
In addition, an embedded part where the housing is mounted in the gap of the system ceiling
And hanging down from the lower part of the embedding part below the ceiling surface.
Because it is composed of girder protrusions,
The location can be understood at a glance, making maintenance and management easy,
The protrusion to the indoor part can be suppressed thinly .

[Procedure amendment 20]

[Document name to be amended] Statement

[Correction target item name] 0037

[Correction method] Change

[Correction contents]

According to the third aspect of the present invention, the fire alarm
The elephant detector is composed of an embedded part and a protruding part.
To form protrusions without increasing the height of the housing
It can be.

[Procedure amendment 21]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction contents]

Further, according to the invention of claim 4 , the air flow
Since the entrance is formed on the side wall of the protrusion, heat during a fire
Smoke in the updraft that is led into the gaps in the system ceiling
The smoke in the horizontal airflow on the ceiling surface can flow into the fire detection unit .

[Procedure amendment 22]

[Document name to be amended] Statement

[Correction target item name] 0039

[Correction method] Change

[Correction contents]

According to the fifth aspect of the present invention, the detector
Is installed in the exhaust gap of the system ceiling
Therefore, in the event of a fire, the
The smoke in the one-way airflow that is sucked in
And it can be made to continuously flow into the housing or the fire phenomenon detecting section .

[Procedure amendment 23]

[Document name to be amended] Statement

[Correction target item name] 0040

[Correction method] Deleted

[Procedure amendment 24]

[Document name to be amended] Statement

[Correction target item name] 0041

[Correction method] Deleted

[Procedure amendment 25]

[Document name to be amended] Statement

[Correction target item name] 0042

[Correction method] Deleted

[Procedure amendment 26]

[Document name to be amended] Statement

[Correction target item name] 0043

[Correction method] Deleted

[Procedure amendment 27]

[Document name to be amended] Statement

[Correction target item name] 0044

[Correction method] Deleted

[Procedure amendment 28]

[Document name to be amended] Statement

[Correction target item name] 0045

[Correction method] Deleted

[Procedure amendment 29]

[Document name to be amended] Statement

[Correction target item name] 0046

[Correction method] Deleted

[Procedure amendment 30]

[Document name to be amended] Statement

[Correction target item name] 0047

[Correction method] Deleted

[Procedure amendment 31]

[Document name to be amended] Statement

[Correction target item name] 0048

[Correction method] Deleted

[Procedure amendment 32]

[Document name to be amended] Statement

[Correction target item name] 0049

[Correction method] Deleted

[Procedure amendment 33]

[Document name to be amended] Statement

[Correction target item name] 0050

[Correction method] Deleted

[Procedure amendment 34]

[Document name to be amended] Statement

[Correction target item name] 0078

[Correction method] Change

[Correction contents]

[0078]

As described above, according to the first aspect of the present invention , the circuit element is mounted in the housing when mounted on the system ceiling.
Is stored so that the printed circuit board with
Therefore, it is easy to attach the housing to the gap in the system ceiling
Was completed. Further, according to the invention of claim 2, the sensor housing
Since the body is configured to be able to be installed in the gap of the system ceiling,
Regardless of ceiling panel construction or lighting fixture construction,
First, place the sensor housing inside the gap between the system ceiling and the indoor side.
Could be installed with one touch. Also, the housing
An embedding part to be mounted in a gap in a system ceiling, and the embedding part
Projecting part hanging down from the lower part of the part below the ceiling surface
The location of the detector can be determined at a glance
Maintenance and management becomes easier, and
The tension could be kept thin. According to the third aspect of the present invention, the fire detection unit includes the embedded unit and the projecting unit.
Configuration, so that the height of the
A protrusion could be formed. According to the fourth aspect of the present invention, since the air inlet is formed on the side wall of the protruding portion,
Rising air led to gaps in the system ceiling due to heat from a fire
Smoke in the stream and smoke in the horizontal airflow into the fire detector
Was able to flow in . According to the fifth aspect of the present invention, the sensor is mounted in the exhaust space of the system ceiling.
In the event of a fire, it is forcibly connected to the exhaust gap in the system ceiling
The smoke in the one-way airflow that is sucked in
Flow continuously into the housing or into the fire detector.
Was completed.

Claims (16)

[Claims] 1. A housing which can be mounted in a gap in a system ceiling and has a fire event detection unit and a circuit component storage unit therein, and a housing provided at a lower portion or a lower side portion of the fire event detection unit in the housing. A fire detector comprising an air inlet. 2. The method according to claim 2, further comprising the step of:
The fire detector according to claim 1, further comprising an air outlet. 3. A housing comprising a rectangular parallelepiped embedding portion located in a gap in a system ceiling, and a protruding portion provided continuously to the embedding portion and protruding downward from the gap. The fire detector according to claim 1 or 2, wherein: 4. The fire detector according to claim 1, wherein a locking member for a gap in a system ceiling is provided on an upper portion or an upper side portion of the housing. 5. A housing mountable in a gap in a system ceiling and having a fire event detection unit and a circuit component storage unit therein; an air inlet provided in the housing below the fire event detection unit; A plurality of lower passage forming walls forming a labyrinth passage for blocking external light between the air inlet and the fire phenomenon detection unit; and air provided above the fire phenomenon detection unit in the housing. A fire detector comprising an outlet. 6. The fire detector according to claim 5, wherein the housing is formed as a completely buried type including a buried part which is entirely mounted in a gap in the system ceiling. 7. An embedding portion to be mounted in a gap in a system ceiling, and a projecting portion set to have a width smaller than the gap and hanging down from a lower portion of the embedding portion below a ceiling surface. 6. The fire detector according to claim 5, wherein the fire detector comprises: 8. The fire detector according to claim 7, wherein each of the fire phenomenon detection section and the circuit component storage section in the housing is set so as to straddle the embedded section and the projecting section. 9. The method according to claim 1, wherein the fire phenomenon detecting section in the housing is set from one side of the embedded section to the whole area of the projecting section, and the circuit component storage section is set on the other side of the embedded section. The fire detector according to claim 7, wherein 10. The fire detector according to claim 5, wherein the air inlet is provided on a bottom wall of the fire detector in the housing. 11. The fire detector according to claim 5, wherein the air inlet is provided in a lower peripheral side wall and a bottom wall of the fire phenomenon detecting section in the housing. 12. A lower passage forming wall group corresponding to an air inlet of a lower peripheral side wall and a second lower passage forming wall body corresponding to an air inlet of a bottom wall. The fire detector according to claim 11, comprising a group. 13. The fire detector according to claim 5, wherein the air outlet is provided on a top wall of the fire phenomenon detection unit in the housing. 14. The fire detector according to claim 5, wherein the air outlet is provided on an upper side wall and a top wall of the fire phenomenon detection unit in the housing. 15. A plurality of upper passage forming walls for forming a labyrinth passage for shielding external light between an air outlet and a fire phenomenon detecting section.
The fire detector according to claim 14. 16. A first upper passage forming wall group corresponding to an air outlet on an upper side wall and a second upper passage forming wall group corresponding to an air outlet on a top wall. 16. The fire detector according to claim 14, wherein the fire detector comprises: