JPH0757163A - Fire sensor - Google Patents

Abstract

PURPOSE:To obtain the fire sensor which can be fitted by one operation to a system ceiling before ceiling plate constructions and lighting fixture constructions irrelevantly to those constructions by utilizing air ventilation gaps, etc., and can make smoke smoothly flow in the sensor from the bottom to the top. CONSTITUTION:The housing of the sensor which has a fire phenomenon detection part and a circuit component storage part inside is set so that it can be mounted in a gap 6 of the system ceiling; and an air intake is provided below the fire phenomenon detection part and an air outlet is provided above the fire phenomenon detection part. Consequently, plural lower passage forming wall bodies which form a labyrinth passage for cutting off external light are installed between the air intake and fire phenomenon detection part to improve the flowability of air from the bottom to the top of the fire phenomenon detection part, and smoke is enabled to flow in the fire phenomenon detection part, thereby speedily detecting a fire.

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 generated by a fire or a combustion product, and more particularly to a fire detector which can be installed in a gap in a system ceiling with one touch. It is related to vessels.

[0002]

2. Description of the Related Art Conventionally, a sensor for detecting a fire using heat generated by a fire or a combustion product, for example, a heat detection sensor, a smoke detection sensor, a flame detection sensor, a gas detection sensor, an odor detection sensor, etc. There are known sensors equipped with them. All of these various fire detectors are mounted on the ceiling for use.

By the way, in recent years, a system ceiling as shown in FIG. 12 has been widely used in high-rise buildings. In this system ceiling, the support metal fittings 1 provided side by side at a predetermined interval are suspended and supported by a ceiling slab (not shown), and a ceiling plate having a predetermined length and width between the support metal fittings 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 made of a bar having a T-shaped cross section (hereinafter referred to as a T bar), and the space between the support fittings may be narrowed depending on the location. 2 sets of 1 T to install
Configured as bars 4 and 5. One set of two T-bars 4 and 5 has a flange and a ceiling plate 2 and a lighting fixture 3 on one side.
The other side of the flange is arranged in a butted state, and a gap 6 of about 25 mm is usually formed between the butted ends of these flanges, and exhaust, ventilation, etc. can be performed from this gap 6. It is being appreciated. Further, equipment such as a fire detector and a speaker is attached to the ceiling board 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. In addition, a fire detector provided with a smoke detection sensor will be described as an example. In the figure, 7 is a ceiling plate 2
The ceiling hole is formed in the wire, 8 is the wiring of the power supply / signal line, etc., 9 is the body of the fire detector equipped with the smoke detection sensor, and 10 is the exposed base for mounting the body 9 on the ceiling board 2 side. Board 2
It is fixed by a fixing means (not shown) such as a screw or a bolt / nut.

The exposed base 10 has a terminal portion 11 incorporated therein. The terminal portion 11 corresponds to the mounting screw 12 that constitutes the input / output terminal on the main body 9 side, and corresponds to the exposed base 1
It is provided in a plurality of places around 0. Reference numeral 13 is a terminal plate fixed to the terminal portion 11, 14 is a terminal spring, 15 is a terminal piece, 16 is an arcuate claw formed to project on the inner peripheral surface of the exposed base 10, and 17 is an outlet for the wiring 8. .

In the conventional exposed fire detector having the above-mentioned structure, the exposed base 10 is fixed to the ceiling plate 2 in advance at the factory or the construction site together with the speaker (not shown) and the system ceiling together with the ceiling plate 2 at the construction site. Be incorporated into. The body 9 of the fire detector is mounted from below the exposed base 10 to which the wiring 8 has been connected. The body 9 is mounted on the exposed base 10 by attaching the flange of the mounting screw 12 and the terminal portion 11 to each other.
It is done by fitting and rotating with. In the mounted state of the main body 9, the flange of the mounting screw 12 is clamped and held between the flange of the terminal screw 15 and the arcuate claw 16 to be mounted.

FIG. 14 is an explanatory view showing a conventional embedded fire detector attached to the ceiling plate of the system ceiling. In the figure, 21 is a main body of a fire detector equipped 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 the upper surface thereof by a screw (not shown). It is fixed to the ceiling hole 7 of the ceiling plate 2 by holding the ceiling plate 2 with 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 embedded fire detector having the above-described structure, the embedded base 22 is fixed to the ceiling plate 2 in advance at a factory or a construction site together with a speaker (not shown), etc. Installed on 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 to the embedded base 22 is similar to the above-mentioned exposed fire detector.
It is performed by fitting and rotating a flange of a mounting screw (not shown) and the terminal portion.

As a conventional fully embedded fire detector, for example, Japanese Utility Model Publication No. 48-10218 (hereinafter referred to as the first completely embedded fire detector), Japanese Patent Publication No. 32-1637.
Japanese Patent Publication (hereinafter referred to as a second fully embedded 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 uses an air conditioning system that exhausts air from an exhaust slit provided on the ceiling surface, pay attention to the fact that negative pressure is generated on the back side of the ceiling due to air conditioning. A hole is drilled, a horn-shaped support is screwed into this hole with the opening facing the room, and the fire detector is stored at a position deeper than the ceiling surface of the horn-shaped support. There is. A ventilation hole is formed on the peripheral side wall of the horn-shaped support so that the opening area can be adjusted, and the air inside the room passes through the ventilation hole from around the fire detector of the horn-shaped support and the back side of the ceiling surface. While flowing into the fire detector, a part of the smoke is allowed to flow into a fire detector provided with a smoke passage in a direction intersecting with the air flow, whereby a fire can be detected.

In addition, the second fully embedded fire sensor is provided with a fire sensor integrally in the intake duct, and the hot air flow is passed around the fire sensor so that the fire sensor is thermally activated. I am trying to make it work.

Further, as a conventional fire detector in which smoke flows from the bottom to the top in the detector, for example, Japanese Patent Laid-Open No. 52-2
No. 2979 (hereinafter referred to as vertical flow path type fire detector)
There is something shown in. This vertical flow fire detector
Holes are drilled in the bottom and top walls of the detector box to allow smoke to flow from the bottom to the top of the box, and to form a dark box inside the box, so that the bottom of the room where light can enter easily The wall hole (inflow hole) is covered with a funnel-shaped cover in the box and the back side of the parabolic mirror of the light emitting unit so that the incident light does not affect the light receiving unit. A fire can be detected by detecting that the light of the light projecting portion is scattered by smoke particles in the dark box configured as described above.

[0013]

However, the ceiling hole 2 is formed in the ceiling plate 2 and the base 10 or 2 is provided in the ceiling hole 7.
2 is fixed and the main body 9 or 2 is connected via the base 10 or 22.
In the conventional fire detector of the exposed type or the embedded type in which 1 is attached, when a fire detector is added later by changing the floor plan, a ceiling hole 7 for mounting the base is formed in the ceiling plate 2. It has to be installed, which is very troublesome.

Further, the first conventional fully embedded fire detector has a hole for attaching a horn-shaped support member formed in the ceiling surface, like the above-mentioned exposed or embedded fire detector. It is troublesome, and since the air 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 problem that smoke does not flow smoothly into the fire detector in which a smoke passage is provided in the intersecting direction, and it takes time to detect the fire.

The conventional exposed type, embedded type, first type
Since all the conventional embedded fire detectors of the above can be installed on the ceiling board, not only can they not be installed before the ceiling board construction and lighting equipment construction, but the additional fire detector is no longer needed and removed. In this case, there is a problem that the ceiling plate has a hole. Furthermore, basically, smoke can be detected only when it is placed in a horizontal air flow, so the smoke approach direction is 3
The shape must be circular to allow 60 °, which limits the freedom of shape.

In addition, since the second conventional completely embedded fire detector is provided integrally with the fire detector in the intake duct, not only is the cost high, but there are various restrictions such as the installation location. Furthermore, since the fire detector operates in a heat-responsive manner by allowing the hot air flow to flow around the fire detector, there is a problem that it cannot be directly applied to a fire detector other than the heat detection method. is there.

Further, the conventional vertical flow path type fire detector is basically constructed such that the top wall hole (outflow hole) of the detector box is not shielded from light, and therefore the light from the top wall hole is not shielded. The top wall hole cannot be made large in order to suppress the incident, which obstructs the air flow inside the detector box, makes it difficult for smoke to flow into the detector box, and it takes time to detect a fire. .

The present invention pays attention to the above points and that there is a gap in the system ceiling due to, for example, a support metal fitting for supporting the ceiling plate, and regardless of the ceiling plate construction or the lighting fixture construction, these constructions are First, it aims to obtain a fire detector that can be attached to the system ceiling with one touch using this gap, for example, an exhaust gap, and that allows smoke to flow smoothly from bottom to top inside the detector. And

[0019]

A fire detector according to a first invention of the present invention is mountable in a gap of a system ceiling, and has a casing having a fire phenomenon detection portion and a circuit component storage portion therein, An air inlet provided in a lower portion or a lower side portion of the fire phenomenon detection portion in the casing.

The fire detector according to the second aspect of the present invention is provided with an air outlet port above the fire phenomenon detecting portion in the housing.

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

Further, the fire detector according to the fourth aspect of the present invention is provided with a member for locking with respect to a gap in the system ceiling on the upper or upper side of the housing.

The fire detector according to the fifth aspect of the present invention can be mounted in a gap in the system ceiling, and has a casing having a fire phenomenon detection portion and a circuit component storage portion therein, and a casing in the casing. An air inlet provided in the lower portion of the fire phenomenon detecting portion, a plurality of lower passage forming wall bodies forming a labyrinth passage for shielding external light between the air inlet and the fire phenomenon detecting portion, An air outlet provided on an upper portion of the fire phenomenon detection unit in the housing.

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

Further, in the fire detector according to the seventh aspect of the present invention, the housing is provided with an embedded portion mounted in a gap of the system ceiling, and the casing is set to have a width smaller than the gap. It is composed of a projecting portion that is provided so as to hang down from the lower portion to below the ceiling surface.

Further, in the fire detector according to the eighth aspect of the present invention, both the fire phenomenon detecting portion and the circuit component accommodating portion in the housing are set across the embedded portion and the protruding portion. It is a thing.

Further, in the fire detector according to the ninth aspect of the present invention, the fire phenomenon detecting portion in the housing is set from one side of the embedding portion to the entire protruding portion, and the circuit component accommodating portion is It is set on the other side of the embedding part.

The fire detector according to the tenth aspect of the present invention is such that the air inlet is provided on the bottom wall of the fire phenomenon detecting portion in the housing.

The fire detector according to an eleventh aspect of the present invention is one in which the air inlets are provided on the lower peripheral side wall and the bottom wall of the fire phenomenon detecting portion in the housing.

Further, in the fire detector according to the twelfth aspect of the present invention, the lower passage forming wall body includes the first lower passage forming wall body group corresponding to the air inlet of the lower peripheral side wall and the bottom wall. And a second lower passage forming wall group corresponding to the air inlet.

The fire detector according to the thirteenth aspect of the present invention is such that the air outlet is provided on the top wall of the fire phenomenon detecting portion in the housing.

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

The fire detector according to the fifteenth aspect of the present invention is a plurality of upper passage forming wall bodies forming labyrinth passages for blocking external light between the air outlet and the fire phenomenon detecting portion. Is provided.

In the fire detector according to the sixteenth aspect of the present invention, the upper passage forming wall body includes a first upper passage forming wall body group corresponding to an air outlet of the upper side wall, and an air passage on the top wall. The second upper passage forming wall group corresponding to the outflow port.

[0035]

In the first aspect of the present invention, since the housing of the sensor is constructed so that it can be mounted in the gap in the system ceiling, it is possible to perform the above construction regardless of the ceiling board construction or the lighting fixture construction. First, the mounting is completed simply by mounting the housing of the sensor in the gap of the system ceiling from the indoor side. In addition, an air inlet is provided at the bottom or lower side of the fire detection unit, so smoke in the rising airflow or smoke in the horizontal airflow on the ceiling surface that is guided by the heat of the fire to the gap in the system ceiling can be detected. It can be made to flow into the section.

Further, in the second aspect of the present invention, since the air outlet is provided above the fire phenomenon detecting portion in the housing, the ascending air current due to the heat at the time of the fire smoothly passes through the fire phenomenon detecting portion. It is possible to detect a fire quickly.

According to the third aspect of the present invention, the casing has a rectangular parallelepiped embedded portion located in the gap of the system ceiling, and the casing is provided continuously with the embedded portion and below the gap. Since it is composed of a protruding part that protrudes to, the installation location of the sensor can be seen at a glance, maintenance and management are easy, and
The protrusion to the indoor part can be kept thin.

Further, in the fourth aspect of the present invention, the locking member provided on the upper portion or the upper side portion of the casing engages with the gap when the casing is inserted into the gap of 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 aspect of the present invention, regardless of the work of the ceiling plate and the work of the lighting fixture, only by mounting the housing of the sensor in the gap of the system ceiling prior to these works, Installation is complete. Further, an air inlet is provided at the bottom of the fire phenomenon detection part and an air outlet is provided at the top of the fire phenomenon detection part, and a labyrinth for shielding external light is provided between the air flow outlet and the fire phenomenon detection part. Since we installed multiple walls that form the passage, you can set each mouth to a large size,
The flowability of air from the lower part to the upper part of the fire phenomenon detection part is improved, smoke is smoothly introduced into the fire phenomenon detection part, and the fire can be detected quickly.

Further, in the sixth aspect of the present invention, since the casing is constructed as a completely embedded type which is entirely composed of an embedded portion mounted in the gap of the system ceiling, the casing is below the ceiling surface. It does not project to the right, the mounting state is not obtrusive, objects do not collide and break, and the sprinkler does not get wet and the sensitivity does not drop even if it accidentally explodes by the side.

Further, in the seventh aspect of the present invention, the housing is provided with an embedded portion mounted in a gap of the system ceiling and a ceiling surface from a lower portion of the embedded portion to a width smaller than the gap. Since it is configured with a protruding portion that hangs downward,
The location where the sensor is installed can be seen at a glance, which simplifies maintenance and management, and makes it possible to keep the protrusions inside the room thin.

Further, in the eighth aspect of the present invention, both the fire phenomenon detecting portion and the circuit component accommodating portion in the housing are set over the embedded portion and the protruding portion. In this case, if the printed circuit board on which the circuit element is mounted is vertically arranged in the circuit component housing portion, the protruding portion can be formed without increasing the height dimension of the housing.

Further, in the ninth aspect of the present invention, the fire phenomenon detecting section in the housing is set from one side of the embedding section to the entire projecting section, and the circuit component storing section is provided in the embedding section. It is set on the other side, and in this case, if the printed circuit board on which the circuit element is mounted is arranged laterally in the circuit component housing, the height dimension of the housing can be compressed and the air inlet port can be compressed. Can be set to a larger value, and the amount of smoke flowing into the fire phenomenon detector can be increased.

Further, in the tenth invention of the present invention,
Since the air inlet is provided on the bottom wall of the fire phenomenon detection unit in the housing, the smoke in the ascending airflow guided to the gap in the system ceiling can be flowed straight into the fire phenomenon detection unit.

In the eleventh invention of the present invention,
Since the air inlets are provided on the lower peripheral side wall and bottom wall of the fire phenomenon detection part in the case, not only the smoke in the upward airflow guided to the gap in the system ceiling but also the smoke in the horizontal airflow on the ceiling surface fires. It can be made to flow into the phenomenon detection unit.

In the twelfth aspect of the present invention,
The lower passage forming wall body is composed of a first lower passage forming wall body group corresponding to the air inlet of the lower peripheral side wall and a second lower passage forming wall body group corresponding to the air inlet of the bottom wall. So
It is possible to block light while enlarging the air inlet.

In the thirteenth invention of the present invention,
Since the air outlet is provided on the top wall of the fire phenomenon detection part in the housing, the rising airflow due to the heat during a fire can smoothly pass through the fire phenomenon detection part, and it is installed in the gap in the system ceiling. Smoke can flow into the container without resistance.

In the fourteenth aspect of the present invention,
Since the air outlets are provided on the upper side wall and the top wall of the fire phenomenon detection unit in the housing, the upward airflow due to the heat at the time of fire can more smoothly pass through the fire phenomenon detection unit.

In the fifteenth invention of the present invention,
Since the plurality of upper passage forming wall bodies that form the labyrinth passage for shielding the external light are provided between the air outlet and the fire phenomenon detecting portion, it is possible to shield the light while increasing the air outlet.

In the sixteenth aspect of the present invention,
Since the upper passage forming wall body is composed of the first upper passage forming wall body group corresponding to the air outlet port of the upper side wall and the second upper passage forming wall body group corresponding to the air outlet port of the top wall. The air outlet can be made larger and the light can be shielded, and the ascending airflow due to the heat at the time of the fire can more smoothly pass through the fire phenomenon detection unit.

[0051]

【Example】

Example 1. The present invention will be described below with reference to illustrated embodiments.
1 is a front view showing a state in which a fire detector according to a first embodiment of the present invention is attached to a system ceiling, FIG. 2 is a plan view thereof,
FIG. 3 is a vertical sectional view seen from the side surface side, FIG. 4 is a vertical sectional view seen from the front side, and FIG. 5 is a horizontal sectional view seen from the upper surface side. Are given the same reference numerals. In addition, a fire detector provided with a smoke detection sensor will be described as an example. In each drawing, 31 has a width that can be mounted between two sets of T-bars 4 and 5 which are the support fittings of the system ceiling, and from the embedding portion arranged on the back side of the exhaust gap 6 as a whole. This is a completely embedded type fire detector housing, which is installed across the flanges 4a, 5a of the T-bars 4, 5. 32a and 32b are leaf springs for fixing the casing, one end of which is fixed to both side surfaces of the casing 31 and the other end of which is 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 divided into a fire phenomenon detection unit 33 and a circuit component storage unit 34.

The lower part of the fire phenomenon detector 33, that is, the housing 3
An air inlet 36 is provided in the bottom wall 35 of the No. 1 immediately below the fire phenomenon detecting portion, and a labyrinth passage for blocking external light is formed between the air inlet 36 and the fire phenomenon detecting portion 33. A plurality of lower passage forming walls 37
Are arranged. In addition, the upper part of the fire phenomenon detection unit 33,
That is, the air outlet 39 is provided at a position just above the fire phenomenon detecting portion on the top wall 38 of the housing 31, and the labyrinth for blocking external light is provided between the air outlet 39 and the fire phenomenon detecting portion 33. A plurality of upper passage forming wall bodies 40 that form passages are arranged. Therefore, the fire phenomenon detection unit 33 is configured as a dark box surrounded by the lower passage forming wall body 37, the upper passage forming wall body 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.
Is isolated by a light-shielding column 43, and the light receiving element 42 does not receive the light of the light projecting element 41 in a normal state where a fire does not occur.

A printed circuit board 45 on which a large number of circuit elements 44 such as a light emitting circuit, an amplifier circuit and a switching circuit are mounted is vertically accommodated in the circuit component housing section 34, and the light projecting / receiving element 41 is mounted on the printed circuit board 45. , 42 are connected to the power supply line and the signal line, and wiring of the power supply line and the signal line 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 wire 46 and the connector 47.
To connect directly.

The fire detector of the present embodiment having the above-mentioned structure holds the casing 31 and the exhaust clearance from above the system ceiling until the lower surface abuts the upper surfaces of the flanges 4a, 5a of the T-bars 4, 5. 6, the leaf springs 32a and 32b have tips of the webs 4b and 4b of the T-bars 4 and 5, respectively.
The upper surface of the housing 31 is T-shaped.
The housings 31 are fixed by being engaged with the upper surfaces of the flanges 4a, 5a of the bars 4, 5 and mounted in the gaps in the system ceiling. The lead wire 46 may be connected either before or after the housing 31 is mounted in the exhaust gap 6 on the system ceiling, and can be easily connected by the connector 47.

When a fire occurs indoors, combustion products (hereinafter referred to as smoke) rise in the ascending air current due to the heat of the fire and are sucked into the exhaust gap 6 on the system ceiling. At this time, the smoke rising toward the exhaust gap 6 at the site where the fire detector of the present embodiment is installed directly flows into the air inlet 36 without resistance and is formed by the lower passage forming wall 37. It goes up through the labyrinth passage and flows into the dark box which is the fire phenomenon detection unit 33. The smoke that has flowed into the dark box further rises up through the labyrinth passage formed by the upper passage forming wall body 40 and flows out from the air outlet 39 to the back side of the system ceiling. Since the smoke is forcibly and continuously sucked into the exhaust gap 6, the smoke also continuously flows into the dark box as described above. On the other hand, the light projecting element 41 in the dark box is
It is pulsed periodically. Then, the light projecting element 41
The light projected from is scattered by the inflowing smoke, and the light receiving element 42 detects this 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 display a fire area, and at the same time, an alarm is sounded to notify the occurrence of a fire.

Further, by pulling out the casing 31 mounted in the exhaust gap 6 on the system ceiling from between the T-bars 4 and 5, the casing 31 can be easily removed from the exhaust gap 6. Then, by disassembling the removed casing 31, it is possible to carry out a continuity test of the circuit element 44 mounted on the printed circuit board 45, component replacement, and the like.

As described above, in the fire detector of this embodiment, the vertical flow path type fire phenomenon detecting section 3 is provided in the completely embedded type housing 31.
3 has a configuration including 3 and, regardless of the ceiling plate construction and the lighting fixture construction, the housing 31 is placed between the T-bars 4 and 5 of the system ceiling in the exhaust clearance 6 from above, prior to these constructions. Installation is completed simply by pushing it in. For this reason, it is not necessary to perform the conventional hole-piercing work of the ceiling plate 2, and the construction is facilitated. Furthermore, since it is a completely embedded type, the housing 31 does not project downward from the ceiling surface, the mounting state is not obtrusive, no objects collide and are damaged, and the sprinkler accidentally explodes by the side. Even if it gets wet, the sensitivity does not decrease.

An air inlet 36 is provided below the fire phenomenon detector 33, and an air outlet 3 is provided above the fire phenomenon detector 33.
9, and a plurality of wall bodies 37 and 40 that form labyrinth passages for blocking external light are respectively installed between the mouth portions 36 and 39 and the fire phenomenon detection portion 33. The parts 36 and 39 can be set to be large, the flowability of air from the lower part to the upper part of the fire phenomenon detection part 33 is improved, smoke can smoothly flow into the fire phenomenon detection part, and a fire can be detected quickly. it can.

Further, the housing 31 is installed in the exhaust gap 6 of the system ceiling, and the fire phenomenon detecting section 33 is placed in the one-way air flow so that smoke at the time of fire continuously passes through the fire phenomenon detecting section. Therefore, the fire detector does not need to have a sampling function, and the fire detector can be an automatic sampling type fire detector.

Further, even when the air conditioner is stopped, for example, at night, the rising force of the heat flow of the fire causes the air flow to pass through the fire phenomenon detection unit 33, so that the fire can be detected quickly.

Further, the exhaust gap 6 is formed by the flanges 4a and 5a of the two T bars 4,5 (supporting metal fittings) which support the ceiling plate 2 of the system ceiling, and the casing 31 is provided with the flange 4.
Since it is installed over a and 5a, not only does the mounting base not be necessary, but the fire detector can be installed at any position along the exhaust gap 6, and the installation position is If it becomes inappropriate due to a change, etc., its position can be easily changed, and efficient installation can be performed.

Example 2. FIG. 6 is a vertical cross-sectional view of the fire detector according to the second embodiment of the present invention as seen from the side surface side, and FIG. 7 is a vertical cross-sectional view as seen from the front side thereof, each of which corresponds to the first embodiment. The same reference numerals are given to the parts to be marked. In the case of this embodiment, a projecting portion 51 which is set to a position just below the fire phenomenon detecting portion on the bottom wall 35 of the housing 31 and which is set to have a width smaller than the space of the exhaust gap and which extends downward from the ceiling surface extends. The projection 51 is provided with air inlets 5 on its peripheral side wall and bottom wall, respectively.
2, 53, and the air outlets 39, 54 are formed on the top wall 38 of the housing 31 immediately above the fire phenomenon detection portion and on both side walls, respectively, and the upper passage forming wall body is formed.
A first upper passage forming wall group 55 corresponding to the air outlet 54 of the upper side wall, and a second upper passage forming wall group 55 corresponding to the air outlet 39 of the top wall.
And the upper passage forming wall group 40 of
The other structure is the same as that of the first embodiment.

In this embodiment, since the projecting portion 51 projects into the room, the location of the fire detector can be seen at a glance, maintenance and management can be facilitated, and the protrusion to the room can be kept thin. it can.

Further, since air flow inlets 52 and 53 are formed on the peripheral side wall and the bottom wall of the protruding portion 51, respectively,
Not only the smoke in the upward airflow guided to the exhaust gap of the system ceiling, but also the smoke in the horizontal airflow on the ceiling surface can be made to flow into the fire phenomenon detection unit.

Further, the air outlet 3 is provided on the top wall 38 of the casing 31 directly above the fire detecting portion and on both side walls.
Since 9, 54 are formed, the fluidity of smoke is improved, and the ascending airflow due to the heat at the time of fire can pass through the fire phenomenon detection unit more smoothly.

Further, the upper passage forming wall body includes a first upper passage forming wall body 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, it is possible to block light while enlarging the air outlet.

Example 3. FIG. 8 is a vertical cross-sectional view of a fire detector according to a third embodiment of the present invention as seen from the side, and FIG. 9 is a vertical cross-sectional view as seen from the front side thereof, which corresponds to the first embodiment in each drawing. The same reference numerals are given to the parts to be marked. In this embodiment, the fire phenomenon detector 33 defined inside the housing 31 is used.
And the circuit component accommodating part 34, the gap between the exhaust gap and the embedded part 61 mounted on the back surface of the exhaust gap of the support fitting of the system ceiling, that is, on the upper surfaces of the flanges 4a and 5a of the T-bars 4 and 5. And a protrusion 62 which is set to have a width smaller than that of the embedded portion 61 and hangs downward from the ceiling surface from the lower portion of the embedded portion 61, and the casing 31 is formed on the webs 4b and 5b of the T-bars 4 and 5. The leaf springs 63a and 63b to be fixed have their respective 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 projecting portion 62 on the fire phenomenon detection unit 33 side, respectively. And the lower passage forming wall body is provided with a first lower passage forming wall body group 66 corresponding to the air inlet port 64 of the lower side wall and an air inlet port 65 of the bottom wall.
And a second lower passage forming wall body group 67 corresponding to. Further, in the circuit component storage portion 34, a printed circuit board 45 on which the circuit element 44 is mounted is arranged in the vertical direction across the embedded portion 61 and the protruding portion 62, and other configurations are provided. Is the same as in the first and second embodiments described above.

In this embodiment, each of the fire phenomenon detecting portion 33 and the circuit component housing portion 34 defined inside the housing 31 is composed of an embedding portion 61 and a protruding portion 62, and the fire phenomenon detecting portion is formed. The air inlets 64 and 65 are formed in the lower side wall and the bottom wall of the protruding portion 62 side of 33, and the circuit element 44 is connected across the embedded portion 61 and the protruding portion 62 in the circuit component housing portion 34. Since the mounted printed circuit board 45 is arranged in the vertical direction, it is possible to improve the fluidity of 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 body is constituted by a first lower passage forming wall body group 66 corresponding to the air inlet 64 of the lower side wall.
And the second lower passage forming wall body group 67 corresponding to the air inlet 65 of the bottom wall, it is possible to block light while enlarging the air inlet.

Example 4. FIG. 10 is a vertical cross-sectional view of a fire detector according to a fourth embodiment of the present invention viewed from the side, and FIG. 11 is a vertical cross-sectional view viewed from the front thereof.
The same symbols are given to the portions corresponding to. In this embodiment, the casing 31 is provided on the back surface of the exhaust gap of the support fitting on the system ceiling, that is, the flanges 4a, 5 of the T-bars 4, 5.
It is formed by an embedding portion 71 mounted on the upper surface of a and a projecting portion 72 that is set to have a width smaller than the space of the exhaust gap and that hangs downward from the lower portion of the embedding portion 71 below the ceiling surface. And the fire phenomenon detection unit 33 defined in the housing 31.
Is set from one side of the embedding portion 71 to the entire projecting portion 72 (also exists at the lower portion of 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 having circuit element 44 mounted in component storage 34
5 are arranged in the lateral direction. In addition, leaf springs 73a for attaching the housing 31 to the webs 4b, 5b of the T bars 4, 5,
73b is formed by bending the engaging portions of the webs 4b and 5b in an inverted U shape, and the base ends of the 73b are fixed to the upper surface of the housing 31. Further, air inlets 74 and 75 similar to those of the above-described third embodiment are formed on the lower side wall and the bottom wall of the fire phenomenon detection portion 33 on the side of the protruding portion 72, and
Air inlets 76 and 77 are also formed on both end walls of the protruding portion 72. In addition, the lower passage forming wall body includes a first lower passage forming wall body group 78 corresponding to the air inlets 74, 76, 77 of the lower peripheral side wall and a second lower passage forming wall body corresponding to the air inlet port 75 of the bottom wall.
And the lower passage forming wall group 79 of
The other configuration is the same as that of the third embodiment.

In this embodiment, the circuit component storage section 3
The printed circuit board 45 is laterally arranged in the
From the one side of the embedding portion 71 to the fire phenomenon detecting portion 33, the embedding portion 71
Is set over the entire lower portion of the projection 72, and the air inlets 74, 75, 76, 77 are provided in the lower peripheral side wall and the bottom wall of the projection 72.
Since the above is formed, it is possible to improve the fluidity of smoke in the fire phenomenon detection unit 33 while compressing the height dimension of the housing.

In addition, the lower passage forming wall body is a first lower passage forming wall body group 78 corresponding to the air inlets 74, 76, 77 of the lower peripheral side wall, and the first lower passage forming wall body 75 corresponding to the air inlet port 75 of the bottom wall. Since it is composed of two lower passage forming wall groups 79, it is possible to shield the light while further enlarging the air inlet.

By the way, in the above-mentioned respective embodiments, the housing 31 of the fire detector is constituted by the two T-bars 4, which are one set on the system ceiling.
When mounting in the exhaust gap 6 formed by 5, the mounting is performed from the upper side of the T-bars 4 and 5 of two sets, that is, from the back of the ceiling. However, when installing the fire detector in the exhaust gap 6 on the system ceiling, it may be installed 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 used in the third embodiment, for example.
2 is the width seen in FIG. 9, the flanges 4a, 5 of the T-bars 4, 5
The width of the embedding portion 61 as viewed in FIG. 9 is set to be narrower than the width of the exhaust clearance 6 while being made wider than the width of the exhaust clearance 6 of the system ceiling formed by a. And the embedding part 61
One end of each elastic piece for locking, which is composed of, for example, a leaf spring having a dogleg-shaped cross section, is fixed to both side walls of the, and the other end is provided to be expandable.

With this configuration, the housing 31
From the indoor side to the exhaust clearance 6 on the system ceiling.
When the casing 31 is inserted into, the step portion of the embedded portion 61 and the protruding portion 62 of the housing 31 comes into contact with the flanges 4a and 5a of the T-bars 4 and 5.
At this time, the elastic pieces provided on both side walls of the embedding portion 61 are narrowed once when passing through the exhaust gap 6 formed by the flanges 4a and 5a, and are expanded after passing through the webs 4b and 5 of the T-bars 4 and 5.
abut b. As a result, the fire detector is fixed by mounting the housing 31 in the exhaust gap 6 on the system ceiling.

When the fire detector is removed for maintenance or inspection or movement, the elastic piece is narrowed by pulling the protruding portion 62 of the casing 31 downward (inside the room), and the exhaust gap 6 The embedded portion 61 can be pulled out from the.

In each of the above-described embodiments, the case where the gap in the system ceiling is the exhaust gap has been described, but it goes without saying that the present invention can be applied to the case where the gap in the system ceiling is not used for exhaust. Yes.
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 that escapes to the back of the ceiling is small compared to the case of exhaust air, so the air provided on the top of the housing 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, since the housing of the sensor is set so that it can be mounted in the gap of the system ceiling, regardless of the ceiling board construction or the lighting fixture construction. Prior to these constructions, the sensor housing can be installed in the gap of the system ceiling from the indoor side with one touch. In addition, since an air inlet is provided at the bottom or lower side of the fire phenomenon detection unit, smoke in the rising airflow or smoke in the horizontal airflow over the ceiling surface that is guided by the heat of the fire to the gap in the system ceiling can be detected. It can be made to flow into the section. Further, according to the second aspect of the present invention, since the air outlet is provided above the fire phenomenon detecting portion in the housing, the ascending airflow due to the heat at the time of the fire can smoothly pass through the fire phenomenon detecting portion. This makes it possible to detect a fire quickly. Further, according to the third aspect of the present invention, the housing is provided with a rectangular parallelepiped-shaped embedding portion located in the gap of the system ceiling, and is provided continuously to the embedding portion and protrudes downward from the gap. Since it is configured with a protruding portion, the installation location of the sensor can be seen at a glance, maintenance and management can be facilitated, and the protrusion to the indoor part can be suppressed. 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 portion or the upper side portion of the casing, the casing can be securely attached to the gap in the system ceiling with one touch. You can Further, according to the fifth aspect of the present invention, since the housing of the sensor is set to be mountable in the gap of the system ceiling, regardless of the ceiling board construction or the lighting fixture construction,
Prior to these works, the sensor housing can be installed in the gap of the system ceiling with one touch. An air inlet is provided at the bottom of the fire phenomenon detector and an air outlet is provided at the top of the fire phenomenon detector, and a labyrinth passage is provided between the air outlet and the fire phenomenon detector to block external light. Since a plurality of lower passage forming wall bodies that form the fireplace are installed, each mouth can be set to a large size, and the air flowability from the lower portion to the upper portion of the fire phenomenon detection portion is improved, which is similar to the second invention. Smoke can be smoothly introduced into the fire phenomenon detection unit, and a fire can be detected quickly. Further, according to the sixth aspect of the present invention, since the housing is configured as a completely embedded type including an embedded portion that is entirely mounted in the gap of the system ceiling, the housing projects downward from the ceiling surface. In this case, the attached state is not obtrusive, an object does not collide and break, and the sprinkler does not get wet even if it accidentally explodes by the side, and it is possible to prevent a decrease in sensitivity due to this explosive event. According to a seventh aspect of the present invention,
The housing is composed of an embedded portion mounted in a gap in the system ceiling, and a protruding portion that is set to have a width smaller than the gap and hangs downward from the lower portion of the embedded portion to below the ceiling surface. Therefore, similarly to the third invention, the installation location of the sensor can be seen at a glance, the maintenance and management can be facilitated, and the protrusion to the indoor part can be suppressed thin. The eighth aspect of the present invention
According to the invention, since 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 protruding section, for example, a printed circuit board is vertically arranged in the circuit component storage section. With the above arrangement, the protrusion can be formed without increasing the height of the housing. According to the ninth aspect of the present invention, the fire phenomenon detection section in the housing is set from one side of the embedding section to the entire projecting section, and the circuit component storage section is provided on the other side of the embedding section. Since the printed circuit board is laterally arranged in the circuit component storage section, the height of the housing can be compressed, and the air inlet can be set to a larger value to prevent smoke from entering the fire phenomenon detection section. 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 phenomenon detection unit in the housing, smoke in the ascending airflow guided to the gap in the system ceiling can be directly fired. It can be made to flow into the detection unit. Further, according to the eleventh aspect of the present invention, since the air inlets are provided on the lower peripheral side wall and the bottom wall of the fire phenomenon detection part in the housing, only the smoke in the ascending airflow guided to the gap in the system ceiling is provided. Moreover, 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 the first lower passage forming wall group corresponding to the air inlet of the lower peripheral side wall and the second lower passage forming wall group corresponding to the air inlet of the bottom wall are configured, the air inlet is large. While it can be shielded. Further, according to the thirteenth aspect of the present invention, since the air outlet is provided on the top wall of the fire phenomenon detection unit in the housing, the ascending airflow due to the heat at the time of the fire smoothly passes through the fire phenomenon detection unit. It is possible to allow the smoke to flow into the sensor installed in the gap of the system ceiling without resistance. Further, according to the fourteenth aspect of the present invention, the air outlets are provided on the upper side wall and the top wall of the fire phenomenon detecting portion in the housing, so that the upward airflow due to the heat at the time of fire passes through the fire phenomenon detecting portion. Is done more smoothly. Further, according to the fifteenth aspect of the present invention, the plurality of upper passage forming wall bodies forming the labyrinth passage for shielding the external light is provided between the air outlet and the fire phenomenon detecting portion. It is possible to block light while enlarging the outlet. Further, according to the sixteenth aspect of the present invention, the upper passage forming wall body corresponds to the air outlet of the upper side wall.
Since it is composed of the upper passage forming wall group 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 making the air outlet larger and to prevent the occurrence of fire. It is possible to cause the rising airflow due to heat to pass through the fire phenomenon detection portion more smoothly.

[Brief description of drawings]

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

FIG. 2 is a plan view of FIG.

FIG. 3 is a vertical sectional view as seen from the side surface side of FIG.

FIG. 4 is a vertical cross-sectional view seen from the front side of FIG.

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

FIG. 6 is a vertical cross-sectional view of a fire detector according to a second embodiment of the present invention viewed from a side surface side.

FIG. 7 is a vertical sectional view seen from the front side of FIG.

FIG. 8 is a vertical cross-sectional view of a fire detector according to a third embodiment of the present invention viewed from a side surface side.

9 is a vertical cross-sectional view as seen from the front side of FIG.

FIG. 10 is a vertical cross-sectional view of a fire detector according to a fourth embodiment of the present invention viewed from a side surface side.

11 is a vertical cross-sectional view seen from the front side of 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 Section 34 Circuit Component Storage Section 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 Projection 55 First upper passage forming Wall group 61,71 Embedded part 66,78 First lower passage forming wall group 67,79 Second lower passage forming wall group

Claims (16)

[Claims] 1. A housing that can be mounted in a gap in a system ceiling and has a fire phenomenon detection section and a circuit component storage section inside, and is provided in a lower portion or a lower side portion of the fire phenomenon detection section in the housing. A fire detector having an air inlet. 2. An upper part of the fire phenomenon detection part in the housing,
The fire detector according to claim 1, wherein an air outlet is provided. 3. The housing is composed of a rectangular parallelepiped embedded portion located in a gap of the system ceiling, and a protrusion provided continuously to the embedded portion and protruding downward from the gap. The fire detector according to claim 1 or 2, characterized in that. 4. The fire detector according to any one of claims 1 to 3, wherein a member for locking a gap in the system ceiling is provided on an upper portion or an upper side portion of the housing. 5. A casing that can be mounted in a gap in a system ceiling and has a fire phenomenon detection unit and a circuit component storage unit inside, and an air inlet provided under the fire phenomenon detection unit in the casing. A plurality of lower passage forming wall bodies forming a labyrinth passage for shielding external light between the air inlet and the fire phenomenon detecting section, and air provided above the fire phenomenon detecting section in the casing. A fire detector having an outlet. 6. The fire detector according to claim 5, wherein the housing is configured as a completely embedded type including an embedded portion which is mounted in a gap in the system ceiling. 7. A housing is provided with an embedded portion mounted in a gap of a system ceiling, and a protrusion provided so as to have a width smaller than the gap and hang downward from a lower portion of the embedded portion below a ceiling surface. The fire detector according to claim 5, wherein the fire detector is configured with a part. 8. The fire detector according to claim 7, wherein 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 protruding section. 9. The fire phenomenon detection section in the housing is set from one side of the embedded section to the entire 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. 10. The fire detector according to claim 5, wherein the air inlet is provided on the bottom wall of the fire phenomenon detection portion of the housing. 11. The fire detector according to claim 5, wherein the air inlets are provided on the lower peripheral side wall and the bottom wall of the fire phenomenon detecting portion in the housing. 12. A lower passage forming wall body, a first lower passage forming wall body group corresponding to an air inlet port of a lower peripheral side wall, and a second lower passage forming wall body body corresponding to an air inlet port of a bottom wall. The fire detector according to claim 11, wherein the fire detector comprises a group. 13. The fire detector according to claim 5, wherein the air outlet is provided on a top wall of the fire phenomenon detecting portion in the housing. 14. The fire detector according to claim 5, wherein the air outlets are provided on the upper side wall and the top wall of the fire phenomenon detecting portion in the housing. 15. A plurality of upper passage forming wall bodies forming a labyrinth passage for blocking external light is provided between the air outlet and the fire phenomenon detecting portion.
A fire detector according to claim 14. 16. A first upper passage forming wall group corresponding to the air outlet of the upper side wall, and a second upper passage forming wall group corresponding to the air outlet of the top wall. 16. The fire detector according to claim 14 or claim 15, characterized in that