JP3687010B2 - Fire detector - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a fire sensor, and more particularly to a fire sensor attached to a strip-shaped opening formed in a system ceiling or a rectangular opening provided for mounting on a ceiling plate.
[0002]
[Prior art]
In recent years, the construction industry has created a flat interior design with few protrusions by using a beam member with a special unit structure on the ceiling of a high-rise building or the like. A metal beam called “T-bar” is used for the beam member of the unit structure. “T-bars” are connected in a reverse T-shape with an interval in pairs. A ceiling plate is placed on the overhanging portion of the inverted T-shape of a plurality of beam members in which “T bars” are connected in a pair structure, and a strip-shaped opening formed between the inside overhanging portions is usually It is opened as it is and used as an exhaust or ventilation passage.
[0003]
FIG. 14 is an explanatory diagram showing the configuration of a conventional exposed fire detector attached to the ceiling plate of the system ceiling.
In FIG. 14, 101 is a ceiling hole drilled in the ceiling plate 102, and 103 is a wiring such as a power / signal line. Reference numeral 104 denotes a cylindrical fire detector body having a cylindrical smoke detector 105 therein, and 106 denotes an insect repellent wire net provided at the smoke inlet of the main body 104. Reference numeral 107 denotes an exposed base for attaching the main body 104 to the ceiling plate 102 side, and is fixed to the ceiling plate 102 by fixing means (not shown) such as screws, bolts and nuts.
[0004]
In the conventional fire detector configured as described above, smoke flowing in the horizontal direction along the ceiling surface flows into the smoke detector 105 from the smoke inlet of the main body 104 via the wire mesh 106, and a fire is detected. It has become so.
[0005]
[Problems to be solved by the invention]
By the way, in order to make the ceiling surface as clean as possible, it is required to reduce the size of the fire detector. In particular, in the case of the above-described system ceiling that has recently been put into practical use, Installing a cylindrical fire detector with a hole has a problem that goes against the idea of a system ceiling that makes the ceiling surface as clean as possible.
[0006]
The present invention has been made to solve the problems of the conventional fire detector, and is a small rectangular parallelepiped type with few exposed parts on the ceiling surface, and is particularly suitable for a system ceiling in terms of design and design. The purpose is to realize a fire detector with other advantages.
[0007]
[Means for Solving the Problems]
A fire detector according to the present invention includes a rectangular parallelepiped case having a smoke inlet at a lower portion and a rectangular cross section, and a printed circuit board provided in a vertical direction in the case and dividing an internal space into two chambers. And a detection chamber formed in one space of the printed circuit board.
The fire detector according to the present invention includes a rectangular parallelepiped case having a rectangular cross section, a detection chamber and a printed circuit board formed in the case, and the case includes a front case and a back case. The main case is divided into two parts, and the sub case is connected to the lower part of the main case and provided with a smoke inlet.
[0008]
Further, the detection chamber is provided with a ventilation path for raising the airflow flowing in from the smoke inlet through the detection unit and releasing the airflow from the upper part to the outside.
Further, the air passage is formed by longitudinally cutting the direction of the central part of the optical bench provided in the detection chamber.
In addition, the electronic component mounting chamber is provided in the other space of the printed circuit board.
In addition, the front case and the back case are fixed with screws.
Further, a drain port for draining water is formed in the back case.
Further, reverse coupling preventing means for preventing reverse coupling of the sub case coupled to the main case is provided.
Further, the reverse coupling preventing means is constituted by a display window provided on the bottom surface of the sub case so as to face the indicator lamp connected to the printed circuit board.
Further, the reverse coupling preventing means is composed of coupling portions having different thicknesses in the main and sub cases.
[0009]
[Action]
The sub case is joined after the printed circuit board is assembled in the main case of the main body of the fire detector. A detection unit is disposed in the detection chamber on the front surface of the case, and a chip component mounted on the printed circuit board is accommodated in the mounting chamber on the back surface. An input / output terminal mechanism is fixed to the top of the mounting bracket.
[0010]
The mounting bracket to which the terminal mechanism is fixed is inserted from the side of the terminal mechanism between the legs of the fixing bracket that is opened like a stepladder. Insert the tightening screw from the inside into the hole of the mounting bracket, and screw only the screw tip into the screw hole of the stepladder piece. A mounting bracket to which a terminal mechanism is attached by screwing only the screw tip is temporarily assembled inside the legs of the fixing bracket. Input / output wiring drawn from the back of the ceiling is connected to each connection terminal of the terminal block of the terminal mechanism on the temporarily assembled mounting bracket.
[0011]
In the temporarily assembled state, the mounting bracket can freely move within the range of the screw portion that is not screwed. Therefore, the fixing bracket is pressed against the mounting bracket while pressing the spring-like leg portion to narrow the interval. The tip of the foot of the fixed metal fitting pressed fits into the frame frame, and the contracted state of the space between the legs is locked and held as it is. With the leg spacing contracted, insert it into the band-like opening in the system ceiling. When the mounting bracket is inserted until it comes into contact with the T-bar and the fixing bracket is pushed up, the fixing bracket returns to the normal state with the legs open.
[0012]
After inserting the mounting bracket and mounting bracket, tighten the two tightening screws using a slightly longer screwdriver. By tightening the tightening screw, the mounting bracket is attached to the system ceiling with the mounting chamber opened to the floor surface side by a fixing bracket straddling between the T-bars of the pair structure. Thereafter, the main body of the fire detector is inserted into the mounting chamber of the mounting bracket. In this way, the main body of the rectangular parallelepiped fire detector is detachably mounted in the opening of the system ceiling.
[0013]
【Example】
Example 1.
Embodiments of the present invention will be described below with reference to the drawings.
1 is a diagram for explaining the configuration of Embodiment 1 of the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a rear view of FIG. 1, FIG. 4 is a bottom view of FIG. It is sectional drawing which shows an assembly | attachment state. In the embodiment of the present invention, there are many components including a fire detector mounting device, and the structure and arrangement of the main body of the detector are not common to the above-described devices. To explain.
[0014]
1 to 5, reference numeral 1 denotes a system ceiling, and 11 denotes the above-described T bar. As shown in the figure, the T bar 11 is composed of a vertical flange portion 12 and a horizontal flange portion 13, and a long molding material having a substantially T-shaped cross section obtained by drawing a light metal alloy such as aluminum is used. Two T-bars 11 are arranged in an inverted T shape with a strip-shaped opening 14 having a constant width of 25 mm (or 19 mm or 12.5 mm, etc.), and are connected in a pair structure with a bracket (not shown). Is configured.
[0015]
Each beam member 10 in which the T-bars 11 are combined in a pair structure is vertically arranged at a uniform height in a ceiling space in a row from a roof set, a floor beam on an upper floor, or the like, using a vertical flange 12. . A ceiling-mounted ceiling plate 15 is placed and held on a horizontal ridge 13 that protrudes in the horizontal direction between adjacent rows of the beam members 10 that are suspended.
[0016]
Reference numeral 2 denotes a fixing member. A metal plate is used as the material of the fixing member 2, and a pair of stepladder pieces 21 and 22, which are coupled to each other at the lower side of the opposing short side, are projected to form a stepladder-shaped fixing bracket 20 as shown in FIG. 6. Is done. Reference numerals 23 and 24 denote top portions of the fixing bracket 20, and reference numerals 25 and 26 denote screw holes formed by burring on both top portions 21 and 22. The screw holes 25 and 26 are provided with the two fastening screws 27 and 28 shown in FIGS. Screwed together.
[0017]
In addition, 31 and 32 are legs of the fixing bracket 20, 33 and 34 are legs that are bent inward at the lower ends of the legs 31 and 32, and 35 and 36 are legs when the bracket-shaped punching hole is bent. It is a stop piece formed on the extended surface of the parts 31 and 32. An elastic force is applied to both leg portions 31 and 32 opened in a stepladder shape, and when a pressing force is applied from both sides, the normal interval between the foot portions 33 and 34 is reduced. The fixing bracket 20 is straddled on the left and right lateral ribs 13 across the opening 14 of the system ceiling 1 in a state where the pair of stepladder pieces 21 and 22 keeps a normal interval (see FIG. 1).
[0018]
Reference numeral 4 denotes a mounting member serving as a base for mounting the fire detector on the ceiling 1. In this embodiment, the mounting member 40 is configured by using all metal materials for the mounting member 4. The mounting bracket 40 has a gate-shaped holding frame 41 having a U-shaped upper side and left and right side sides as shown in FIG. 7, and a frame obtained by extruding the body part with a slightly thin plate material leaving a collar part. A frame 42 and two spring-shaped spring plates 43 are provided.
[0019]
The spring plate 43 is fixed to the left and right short sides of the frame frame 42 by spot welding with the arc portion protruding inward, and the frame frame 42 is integrally fixed to the opening end of the holding frame 41 by the same means. The mounting bracket 40 with the 43 portion fixed integrally is provided with a flange 44 at the open end and is formed in a reverse U-shaped longitudinal section, and a rectangular tubular mounting chamber 45 is formed inside. On both sides of the entrance of the mounting chamber 45, the arc portion of the spring plate 43 is exposed.
[0020]
40a is a burr hole that penetrates the upper side of the mounting bracket 40, 40b is an upright mounting piece having a screw hole for burring, 40c is an L-shaped hinge hole, and 40d and 40e are a pair of differences formed in the left and right shoulders. The insertion hole and the locking hole 40f are small semicircular signs formed on the flange 44 on the bottom surface (frame frame 42). Reference numeral 40g denotes a bent piece on both sides of the U-shape of the mounting bracket 40 (holding frame 41), and reference numeral 40h denotes a cut portion on the upper side.
[0021]
5 is a terminal mechanism, and 5a to 5c are three sets of wiring for input / output. The terminal mechanism 5 is provided in the upper part of the mounting bracket 40 as shown in FIGS. 1 to 3 and connected to the wires 5a to 5c drawn from the back of the ceiling. 5, 50 is a terminal block of the terminal mechanism 5, 51 is a terminal cover, and 52 is a connector plug.
[0022]
6 is a main body of the fire detector. Reference numeral 60 denotes a case of the main body 6, which is formed of a synthetic resin in a substantially rectangular parallelepiped shape having a small outline shape as shown in FIGS. The case 60 includes a main case 61 with a lid and no bottom and a secondary (auxiliary) case 62 with a bottom without a lid. The main case 61 is further divided into two parts, a slightly deeper front case 63 and a shallow back case 64. The front case 63 and the back case 64 are fitted together from the front and back and fixed with two screws 61a (see FIG. 3), and the sub case 62 is fitted to the bottom so that the openings of the main and sub cases 61 and 62 protrude from each other. Are combined. Incidentally, if the dimensions of the main body are shown, the length, width and thickness are 11 × 6 × 2.4 (cm), respectively.
[0023]
61b is a drop part of the main case 61, and 61c is a sliding part. The drop-in part 61b is provided opposite to the spring plate 43 at the entrance of the mounting chamber 45, and is formed on both side surfaces of the joined main case 61. Further, the sliding portion 61c is formed halfway by scraping the ridge lines formed at the four corners outside the main case 61 at right angles. 61d is a fitting portion formed by a stepped portion at the opening end of the main case 61 and into which the sub case 62 is fitted, and 61e (not shown) is a thick portion provided at the center of the fitting portion of the front case 63.
[0024]
In FIG. 9A, 63a is a connector chamber surrounded by a U-shaped wall 63b in the front case 63, 63c is two female screw studs, 63d is an arcuate wall, 63e is a C-shaped wall, and 63f is It is a key-shaped piece protruding at the bottom. Both the U-shaped wall 63b and the arcuate wall 63d are provided with long rectangular vent holes 63g and 63h at the center. Then, the smoke conveyed to the air flow flowing into the main body 6 from below is rectified into the square-shaped wall 63e and the arcuate wall 63d, and flows out to the upper outside through the vent holes 63h and 63g. As a result, an air flow containing smoke is induced near the center of the optical bench, which will be described later, and the smoke detection of the main body 6 of the fire detector is effectively performed.
[0025]
In FIG. 9B, 64a is a connector chamber surrounded by parallel walls 64b in the back case 64, 64c is two hollow stepped studs, and 64f is a key-shaped piece projecting to the bottom. The portion corresponds to the connector chamber 63a and the like on the front case 63 side. 64g is a narrow vertical groove formed on both sides of the back case 64, 64h is a step provided on the inside of both sides, 64i is a through hole provided on the back for testing and adjustment, and 64j Are two positioning pins. Further, 64k is a bottom wall that is the same height as the stepped portion 64h along the opening side, and 64m is a drain outlet provided in the bottom wall 64k. The stepped portion 64h and the bottom wall 64k reinforce the synthetic resin case 64 in addition to positioning. In particular, the bottom wall 64k makes the opening of the deep box-shaped case 64 robust.
[0026]
The arrangement state of the storage components inside the main case 61 is shown in FIGS.
65 is a printed circuit board on which electronic components are mounted, 66 is a connector socket, 67 is an optical table, 68 is a thin plate-shaped optical table cover, 69 is an insect screen, 70 is a display lamp that is connected to the printed circuit board 65 and hangs down. (Confirmation light). The printed circuit board 65 is set inside the back case 64 with a gap on the back side by a hollow stepped stud 64c, a stepped portion 64h and a positioning pin 64j.
[0027]
The set printed circuit board 65 divides the internal space of the case 60 into two chambers. By dividing the internal space of the printed circuit board 65, the mounting chamber 72 containing the electronic components on the back side is isolated from the detection chamber 71 on the front side. Further, the connector socket 66 on the printed circuit board 65 in the set state is accommodated in the connector chamber 64 a and is opposed to the connector plug 52 of the terminal block 50.
[0028]
Further, the optical bench 67 and the optical bench cover 68 are formed of a black resin and are structured so as to be combined into a cylindrical shape by pins (not shown) of the optical bench cover 68. Inside the cylindrical optical stand 67, a large number of Y-shaped and J-shaped light shielding pieces 67a are provided in the periphery, and a light projecting element 67b and a light receiving element 67c (both accurate display is omitted). ) Is also designed. Reference numeral 69 denotes an insect net that surrounds the circumferential surface of the optical bench 67.
[0029]
The inside of the optical bench 67 forms a so-called labyrinth structure so that only smoke generated by a fire can be circulated by blocking external light.
[0030]
On the other hand, in the sub case 62, 62a is an elongated rectangular smoke inlet that penetrates the side wall, 62b is a parallel partition at the center of the interior, 62c and 62d are six ventilation chambers r1 to r6 that are arranged in the left and right spaces of the parallel partition 62b. [Fig. 8, Fig. 9 (c)]. Further, 62e is a display window provided near the long side in the parallel partition 62b, and 62f is a projection having a stepped portion formed at the back and inclined at the opening side. Two smoke inlets 62a are provided on the long side walls and one on each short side wall, and each of these smoke inlets 62a corresponds to the ventilation chambers r1 to r6.
[0031]
62g is a narrow gap formed between the front ends of the partitions 62b to 62d and the four side walls on the front, rear, left and right sides, and 62h and 62i are a fitting portion and a thin portion. The sub case 62 incorporates an insect screen 73 that also serves as a dust proof.
The insect net 69 surrounds the circumferential surface of the optical bench 67.
The sub case 62 assembled with the insect screen 73 is detachably fitted to the bottom of the main case 61 containing the printed circuit board 65 and the optical bench 67.
[0032]
When the sub case 62 is fitted, the protrusion 62f is locked by being locked to the key-shaped pieces 63f and 64f of the main case 61. At the same time, the indicator lamp 70 is opposed to the window frame of the display window 62e. At this time, the correctness of the fitting operation is determined from the biased position of the display window 62e and the correspondence between the thick part 61e of the front case 63 and the thin part 62i of the sub case 62, and the same function as the above-described sign 40f is managed. . The case 60 in which the main case 61 and the sub case 62 are combined is closely fitted at all joints, and leakage from the side of the airflow flowing in from the smoke inlet 62a and rising up the vertical air passage is designed. Is designed to be equally configured.
[0033]
The assembly operation of the fire detector according to the embodiment of the present invention having the above-described configuration will be described with reference to FIG.
Assume that the main body 61 of the fire detector as shown in FIG. 8 is configured by previously connecting the sub case 62 to the bottom of the main case 61 in which the printed circuit board 65 and the like are assembled. A detection unit including an optical bench 67 and an optical bench cover 68 is formed in the detection chamber 71 on the front surface, and a chip component mounted on the printed circuit board 65 is accommodated in the mounting chamber 72 on the rear surface. Further, an input / output terminal mechanism 5 is also fixed to the upper portion of the mounting bracket 40 (FIGS. 1 to 3 and 5).
[0034]
The mounting bracket 40 to which the terminal mechanism 5 is fixed is inserted from the side of the terminal mechanism 5 between the legs 33 and 34 of the fixing bracket 20 that is opened like a stepladder. The tightening screws 27 and 28 are inserted from the inside into the fool holes 40a and 40a of the mounting bracket 40, and only the screw ends are slightly screwed into the screw holes 25 and 26 of the stepladder pieces 21 and 22, respectively. The mounting bracket 40 to which the terminal mechanism 5 is attached by screwing only the screw tip is temporarily attached to the inside of the leg portions 31 and 32 of the fixing bracket 20 with some backlash.
[0035]
In the temporarily assembled state, the mounting bracket 40 in which the tightening screws 27 and 28 are passed through the fool holes 40a and 40a can freely move within the range of the screw portion where the screwing is left.
Accordingly, the fixing bracket 20 is pressed against the mounting bracket 40 side while pressing the opened spring leg portions 31 and 32 from both sides to narrow the interval. The tips of the legs 33 and 34 of the fixed metal fitting 20 thus pressed fit into the frame frame 42, and the stop pieces 35 and 36 come into contact with the frame frame 42 to stop the insertion. Then, by inserting the tips of the legs 33 and 34, the state where the distance between the legs 31 and 32 is contracted and thinned as shown in FIG.
[0036]
On the other hand, when the temporary mounting of the mounting bracket 40 to the fixing bracket 20 is finished, the input / output wirings 5 a to 5 c are pulled out from the opening 14 of the system ceiling 1. The exposed core wires of the drawn wires 5a to 5c are connected to the terminal block 50 by opening the terminal cover 51 as shown in FIG. The terminal cover 51 is raised in the direction of the arrow and locked.
[0037]
Here, the fixing bracket 20 and the mounting bracket 40 in a state where the wiring is completed and held in the thin width are inserted into the opening 14 of the system ceiling 1 from the floor surface side. When the flange 44 of the mounting bracket 40 comes into contact with the T-bar 11 and is inserted to the back, and the fixing bracket 20 is pushed up, the fixing bracket 20 expands the leg portions 31 and 32 and returns to the normal interval by the play of temporary assembly. . The state of both metal fittings 20 and 40 at this time is shown in FIG.
[0038]
After inserting the fixing bracket 20 and the mounting bracket 40, a slightly long screwdriver is inserted from below, and the two tightening screws 27 and 28 are tightened. By tightening the tightening screws 27 and 28, the mounting bracket 40 is attached to the system ceiling 1 by opening the mounting chamber 45 to the floor side by the fixing bracket 20 straddling between the T-bars 11 of the pair structure. Thereafter, the main body 6 of the fire detector is inserted into the mounting chamber 45 of the mounting bracket 40 from the main case 61 side. In this case, since the sliding portion 61c of the main body 6 is guided by the bent piece 40g of the mounting bracket 40, it can be smoothly inserted and attached.
[0039]
In this way, the main body 6 of the rectangular parallelepiped fire detector is mounted in the opening 14 of the system ceiling 1. In a similar operation, fire detectors in the same hierarchy are installed on the system ceiling 1 for each monitoring area. And the fire detector group attached to the system ceiling 1 of each hierarchy is connected to the fire receiver installed in the monitoring room for every circuit | line via wiring 5a-5c, respectively.
[0040]
When a fire occurs, the heated smoke rises indoors and flows into the ventilation chambers r1 to r6 from the smoke inlets 62a of the fire detector 6 attached to the opening 14 of the system ceiling 1, and enters the detection chamber 71. The ventilation path which cuts through the center part direction of the labyrinth of the provided optical bench 67 is lifted and discharged to the outside.
[0041]
On the other hand, the light projecting element 67b in the optical bench 67 is periodically pulsed. Then, the light projected from the light projecting element 67b is scattered according to the concentration of the smoke that flows in, and the light receiving element 67c detects this scattered light. The detection signal of the light receiving element 67c is amplified by an electronic circuit on the printed circuit board 65, and is sent to the receiver via the wires 5a to 5c when the smoke concentration exceeds a set value. As a result, the fire area is displayed, and alarms provided in various places in the house are sounded to notify the occurrence of the fire. At the same time, the indicator lamp 70 is turned on, and the fire detector that has been activated by a fire can be visually recognized through the display window 62e.
[0042]
When it is necessary to remove the main body 6 during regular maintenance / inspection, the exposed portion of the main body 6 of the fire detector is picked and pulled down. Then, depending on the uneven fitting structure, the engagement between the spring plate 43 and the drop portion 61b is released, and the main body 6 can be manually pulled out from the mounting chamber 45. The main body 6 removed from the mounting chamber 45 disengages the protrusion 62f from the key-shaped pieces 63f and 64f, and the sub case 62 is removed from the main case 61. Furthermore, if one or two screws 61a are loosened, the main case 61 is separated into a front case 63 and a back case 64, and the inside is easily disassembled. The disassembled optical bench 67, insect screen 69, etc. are maintained, and the printed circuit board 65 is inspected for electronic circuits.
[0043]
Application Example In another application example of the present invention, unlike the description in Example 1, the main body 6 of the fire detector has a finite long side instead of the infinite band-shaped opening 14 formed in the system ceiling 1 described above. It is attached to a rectangular opening.
[0044]
The configuration of the application example is shown in FIGS.
Reference numeral 16 in FIGS. 12 and 13 denotes a rectangular opening for mounting the main body 6 of the fire detector. The opening 16 has a slightly larger outline shape than the transverse cross section of the mounting bracket 40, and is provided in the ceiling plate 15, for example. Since other configurations of the mounting bracket and the like are the same as those described above, re-explanation is omitted.
[0045]
In the above-described embodiment of the present invention, the case where the fire detector is attached to the ceiling has been described as an example. However, the present invention can be applied to a side wall other than the ceiling. Further, although the case where metal is used for the material of the fixing member and the mounting member has been described, it is also possible to use a synthetic resin member in which a nut, a leaf spring, or a reinforcing metal thin plate is insert-molded.
[0046]
Furthermore, the fire detector that detects the occurrence of a fire based on the change in the amount of light received by the light-receiving element associated with the reflected light of smoke generated during a fire inside the labyrinth has been explained, but the resistance change of the semiconductor accompanying the generation of heat during a fire A fire detector using the above may be used, and the material and shape of other parts are not necessarily limited to those in the embodiments.
[0047]
【The invention's effect】
A fire detector according to the present invention comprises a rectangular parallelepiped case having a smoke inlet at the bottom and a rectangular cross section, and a printed circuit board provided in the vertical direction in the case to divide the internal space into two chambers. And a detection chamber formed in one space of the printed circuit board, the fire detector is small and there are few exposed parts, and the fire detector can be stored neatly in the ceiling surface. Can follow.
[0048]
In addition, the following effects can also be obtained.
(1) Since the case of the main body, which is assembled and fixed with as few as one or two screws, can be divided, there are few parts and it is easy to clean and maintain when dust is collected inside the detector. Convenient for inspection.
(2) Since the reverse coupling prevention means for preventing the main body and the sub case from being inserted by mistake is provided, there is no mistake in wearing even when working on a dark ceiling.
(3) If water accumulates in the main body of the fire detector, especially the room containing the electronic components, it will be short-circuited and destroyed. In the present invention, since the mounting chamber has a drain structure, a short circuit accident or the like can be prevented in advance.
[0050]
Therefore, according to the present invention, it is possible to provide a fire detector having various advantages such as a small rectangular parallelepiped shape with few exposed portions of the ceiling surface and particularly suitable for the system ceiling in terms of design and design.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration of an embodiment of the present invention.
FIG. 2 is a front view of FIG. 1;
3 is a rear view of FIG. 1. FIG.
4 is a bottom view of FIG. 1. FIG.
FIG. 5 is a sectional view showing an assembled state of the embodiment of the present invention.
FIG. 6 is a perspective view of a fixing metal fitting according to an embodiment of the present invention.
FIG. 7 is a perspective view of a mounting bracket according to an embodiment of the present invention.
FIG. 8 is a perspective view of a main body according to an embodiment of the present invention.
FIG. 9 is an exploded inner view of the case of the embodiment of the present invention.
FIG. 10 is a plan view showing an assembled state in the case of the embodiment of the present invention.
FIG. 11 is an operation explanatory diagram of the embodiment of the present invention.
FIG. 12 is a configuration explanatory diagram of an application example of the present invention.
13 is a bottom view of FIG. 12. FIG.
FIG. 14 is a diagram illustrating the configuration of a conventional fire detector.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 System ceiling 2 Fixing member 4 Mounting member 5 Terminal mechanism 6 Fire detector main body 11 T-bar 14 Opening 15 Ceiling board 16 Opening 20 Fixing brackets 21 and 22 Step stand pieces 27 and 28 Tightening screw 40 Mounting bracket 40f Marking 41 Holding frame 42 frame frame 43 spring plate 44 collar 45 mounting chamber 50 terminal block 60 case 61 main case 61a screw 61b drop part 61c sliding part 62 sub (auxiliary) case 62a smoke inlet 62e display window 63 front case 63f key-shaped piece 63g Ventilation hole 63h Ventilation hole 64 Back case 64f Key-shaped piece 64m Drainage port 65 Printed circuit board 67 Optical stand 67b Light emitting element 67c Light receiving element 68 Optical stand cover 69 Insect screen 70 Indicator light (confirmation light)
71 Detection room 72 Mounting room 73 Insect net

Claims (10)

A cross section with Kemuriryu inlet is provided in the lower portion of the rectangular parallelepiped-shaped case, and the printed circuit board to divide the interior space into two chambers provided in the vertical direction within the casing, one of said printed circuit board fire detector characterized by comprising a detection knowledge chamber formed in a space. In a fire detector comprising a rectangular parallelepiped case having a rectangular cross section, a detection chamber and a printed circuit board formed in the case,
  A fire detector comprising: a main case divided into a front case and a back case, and a sub case coupled to a lower portion of the main case and provided with a smoke inlet. 3. The fire detection according to claim 1, wherein the detection chamber is provided with an air passage that raises the airflow flowing in from the smoke inlet through the detection unit and discharges the airflow from the upper part to the outside of the device. vessel. The fire detector according to claim 3, wherein the air passage cuts through a central portion of an optical bench provided in the detection chamber. Fire detector according to claim 1 Symbol mounting characterized by comprising a mounting chamber of the electronic component formed on the other space of the printed circuit board. The fire detector according to claim 2, wherein the front case and the back case are fixed by screws . Fire detector according to claim 2 Symbol mounting, characterized in that the formation of the drain outlet for draining the back casing. The fire detector according to claim 2, further comprising reverse coupling prevention means for preventing reverse coupling of the sub case coupled to the main case. 9. The fire detector according to claim 8, wherein the reverse coupling preventing means is constituted by a display window provided on the bottom surface of the sub case so as to face an indicator lamp connected to the printed circuit board. 9. The fire detector according to claim 8, wherein the reverse coupling preventing means is composed of coupling portions having different thicknesses in the main and sub cases.

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