JP3766912B2 - Fire detector - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a fire detector.
[0002]
[Prior art]
FIG. 10 is an explanatory view showing a conventional fire-type fire detector attached to the ceiling plate of the system ceiling. In the figure, 121 is a ceiling hole drilled in the ceiling plate 122, 123 is a wiring for a power / signal line, 124 is a cylindrical fire detector body with a cylindrical smoke detector 125 inside, 126 is a This is a wire net for insect protection provided on the outer periphery of the smoke detector 125. 127 is an exposed base for attaching the main body 124 to the ceiling plate 122 side, and is fixed to the ceiling plate 122 by fixing means (not shown) such as screws or bolts / nuts.
[0003]
In the conventional fire detector configured as described above, smoke flowing in the horizontal direction along the ceiling surface is introduced from the smoke introduction port of the main body 124 to the smoke detecting unit 125 through the wire mesh 126 and detected. .
[0004]
[Problems to be solved by the invention]
However, recently, in order to make the ceiling surface as clean as possible, it is required to reduce the size of the fire detector. However, as in the conventional example described above, the method of directly introducing the smoke flowing in the horizontal direction into the smoke detecting unit 125 is required. Since the smoke detecting section itself requires a certain width, it is difficult to reduce the size of the exposed portion on the ceiling surface, and it has been impossible to attach it to a narrow portion such as a T-bar gap.
[0005]
The present invention has been made in order to solve the above-mentioned problems. A fire that can flow smoke from the bottom up in the fire detector and can be attached to a narrow portion such as a gap of a T-bar. The purpose is to obtain a sensor.
[0009]
[Means for Solving the Problems]
According to a first aspect of the present invention, a fire detector includes a smoke introduction portion having a box body having a plurality of smoke introduction ports on an outer surface and having an upper portion opened, and the smoke introduction portion provided above the smoke introduction portion. And a main body portion that houses a smoke detecting portion that detects smoke introduced from the portion, and prevents smoke introduced into the smoke detecting portion from flowing out immediately in the main body portion and immediately above the smoke detecting portion. A partition wall is provided.
[0010]
Moreover, the fire detector according to the second aspect of the present invention is such that a small hole is provided in the partition wall of the first aspect of the present invention.
[0012]
Furthermore, a fire detector according to a third aspect of the present invention is provided with a smoke introduction part formed of a box body having a plurality of smoke introduction ports on the peripheral surface and having an upper part opened, and provided above the smoke introduction part. A smoke detection unit that detects smoke introduced from the smoke introduction unit, and an indicator lamp that is turned on when smoke is detected in the smoke detection unit, and a room corresponding to the smoke introduction port in the smoke introduction unit; A partition wall is provided that divides the room into a room in which the indicator light is accommodated .
[0017]
[Action]
In 1st invention comprised as mentioned above, the partition provided in the main-body part and the upper part of the smoke detection part prevents that the smoke introduce | transduced into the smoke detection part flows out upwards immediately.
[0018]
In the second invention configured as described above, since the small holes are provided in the partition wall , the smoke stays in the smoke detecting section for a certain period of time and can pass smoothly.
[0020]
Furthermore, in the third invention configured as described above, since the partition that divides the inside of the smoke introduction portion into a room corresponding to the smoke introduction port and a room in which the indicator lamp is accommodated is provided, the indicator lamp has an effect of smoke. It is easy to confirm the lighting without receiving.
[0022]
【Example】
FIG. 1 is a perspective view showing the external appearance of a fire detector according to the present invention. As shown in the figure, the fire detector 1 of the present embodiment is formed in a substantially rectangular parallelepiped shape by the case body 3, the cover 5, and the smoke introduction portion 7, and in the embodiment, the height H is about 110 mm. The width W was about 60 mm and the thickness T was about 24 mm.
[0023]
2 and 3 are exploded views of the fire detector 1, FIG. 2 (a) is a case body 3 and smoke detector, and FIG. 2 (b) is a side view showing a part of FIG. 2 (a) in cross section. 3 (a) shows the cover 5 and FIG. 3 (b) shows the smoke introduction part 7, respectively.
As shown in FIGS. 2 (a) and 2 (b), the case main body 3 is formed in a U-shaped cross section having side walls on three sides except the lower portion, and the fitting portion 11 of the connector 33 is provided on the upper surface, and on both sides of the lower portion. Are provided with locking portions 13a and 13b, and a locking piece 15a having a locking claw on the outer surface of the distal end is projected from the center of the lower end. Reference numerals 17a and 17b denote fitting grooves of the cover 5 provided inside the side walls.
[0024]
Reference numeral 19 denotes a printed circuit board disposed in the case main body 3. A large number of electrical components such as chip components are mounted on one surface to form a detection circuit, an amplification circuit, etc., and the other surface is formed on the other surface. A light-emitting element 21 and a light-receiving element 23 are mounted, an electrical shield pattern is provided over a wide area, and a labyrinth 27 having an insect repellent wire mesh 25 (see FIG. 2B) is attached to the outer periphery. . Reference numeral 29 denotes a lens installed in front of the light receiving element 23, and reference numeral 31 denotes a light shielding element for preventing the light receiving element 23 from directly receiving light from the light emitting element 21 in a normal state where no fire occurs. Here, the light emitting element 21 is arranged so that its optical axis is substantially horizontal when the fire detector 1 is installed, and the light receiving element 23 is at a position rotated about 120 degrees clockwise, for example, with respect to the light emitting element 21. Has been placed. In addition, the light shield 31 is disposed at a position rotated about 60 degrees clockwise, for example, with respect to the light emitting element 21 and slightly shifted outward from the center of the labyrinth 27.
Reference numeral 33 is a connector mechanically and electrically connected to the printed circuit board 19, and 35 is a confirmation lamp which is connected to the printed circuit board 19 and protrudes from the case body 3. 37a and 37b are screw insertion holes penetrating the case body 3 and the printed circuit board 19.
[0025]
As shown in FIG. 3 (a), the cover 5 is formed in a U-shaped cross section having side walls on three sides except for the lower part, and smoke introduced into the labyrinth 27 is immediately removed from the substantially central part. Is provided with a semicircular partition wall 39, and the partition wall 39 has a recess 39a at the center thereof. In addition, guide pieces 41 a and 41 b for guiding smoke introduced from the smoke introduction part 7 to the labyrinth 27 are provided upright on the lower inner side of both side walls of the cover 5. Reference numeral 43 denotes a fitting portion of the connector 33, and a concave portion 43a is provided in the lower portion thereof. 45a and 45b are studs having screw holes. Reference numerals 13c and 13d denote locking portions provided at the lower portions of both side walls, and reference numeral 15b denotes a locking piece protruding from the lower end portion and having locking claws on the outer surface.
[0026]
As shown in FIG. 3 (b), the smoke introduction part 7 is formed in a rectangular parallelepiped whose upper part is opened, and a plurality of smoke introduction ports 47 (see FIG. 1) provided on the peripheral wall are provided for dustproofing and insectproofing. Punch metal or wire mesh 49 is stretched. Reference numerals 51a and 51b denote partition walls provided in the smoke introduction portion 7 corresponding to the respective smoke introduction ports 47, and the inside of the smoke introduction portion 7 includes six rooms corresponding to the six smoke introduction ports 47 by the partition walls 51a and 51b. And a total of seven rooms, one room for accommodating the confirmation lamp 35. 53 is a confirmation hole for confirming the lighting of the confirmation lamp 35 provided on one side of the bottom of the room in which the confirmation lamp 35 is accommodated. Reference numerals 55a and 55b denote locking portions that protrude from the inner surface of the peripheral wall and are locked by the locking claws of the locking pieces 15a and 15b of the case body 3 and the cover 5. A concave portion 57 is provided on one inner wall of the opening of the smoke introducing portion 7 (opposite the confirmation hole 53), and a corresponding convex portion (not shown) is provided at the lower end portion of the cover 5. Is provided.
[0027]
In order to assemble the fire detector 4 having the above-described parts, first, the side walls of the cover 5 are fitted into the fitting grooves 17a and 17b of the case body 3 on which the printed circuit board 19 is disposed, and the two are coupled. . At this time, the connector 33 is accommodated in the fitting portions 11 and 43 of the case body 3 and the cover 5 to expose the upper end portion, and the confirmation lamp 35 protrudes from the lower end portion. Next, screws are inserted into the screw insertion holes 37a and 37b of the case body 3 and the printed circuit board 19 and screwed into the screw holes provided in the studs 45a and 45b of the cover 5, and both are fixed integrally.
[0028]
Next, the smoke introduction part 7 is fitted to the lower end part of the case body 3 and the cover 5 that are joined together, and the latching claws of the latching pieces 15a and 15b of the case body 3 and the cover 5 are fitted to the latching parts 55a and 55b. Lock. As a result, the case body 3, the cover 5 and the smoke introduction portion 7 are integrally coupled as shown in FIG. 1, and the side walls thereof are recessed by the locking portions 13a and 13c and 13b and 13d of the case body 3 and the cover 5, respectively. (Refer to FIG. 1, the locking hole 14 b is not shown), and the confirmation lamp 35 is positioned close to the confirmation hole 53 of the smoke introduction part 7.
[0029]
As shown in FIG. 1, the fire detector 1 includes guide portions 59 a, 59 b, 61 a, and 61 b that are cut at right angles at the corners in the vertical direction of the case body 3 and the cover 5.
[0030]
Next, a mounting device for attaching the fire detector 1 as described above to the gap of the T-bar or the ceiling surface will be described.
FIG. 4 is a front view of the mounting device of the present embodiment, and FIG. 5 is a side view thereof, showing a state in which the rectangular parallelepiped fire detector 1 is mounted between the T bars by the mounting device. In the figure, 65 is a mounting device comprising a base 66 and an elastic metal fitting 67, 68 is a terminal block, and 69a and 69b are T bars.
[0031]
As shown in FIG. 6, the gate-shaped portion 70 constituting the base 66 of the attachment device 65 is formed in a gate shape by a top plate 71 and left and right vertical walls 72a and 72b. At one edge of the top plate 71, a notch 73 into which a connector 33 described later is inserted, and mounting pieces 74a and 74b of the terminal block 68 bent upward on both sides thereof are provided. The other edge is provided with L-shaped fitting holes 75a and 75b to which the terminal block 68 is mounted. Reference numerals 76 a and 76 b denote screw insertion holes provided in the vicinity of both ends of the top plate 71.
[0032]
77a, 77b and 78a, 78b are guide pieces formed by bending approximately 90 ° inward from the lower ends of both edges of both vertical walls 72a, 72b to the inside, and 79a, 79b are vertical walls 72a, 72b. It is a notch part provided in the lower end part.
[0033]
The frame portion 80 that constitutes the base 66 includes a rectangular peripheral wall 81 that is open at the top and bottom, and a flange portion 82 that is formed by bending the lower end portion thereof substantially horizontally outwardly. Notches 83a and 83b are provided corresponding to the notches 79a and 79b of the vertical walls 72a and 72b of the mold part 70. The flange portion 82 may be provided only on both sides of the peripheral wall 81 in the longitudinal direction. Reference numeral 85 denotes an index provided on the flange portion 82. The frame portion 80 is joined integrally to the lower end portion of the portal portion 70 by spot welding or the like with the notches 83a and 83b aligned with the notches 79a and 79b of the portal portion 70.
[0034]
86a and 86b are substantially reverse J-shaped leaf springs, the lower ends of which are joined below the notches 83a and 83b of the frame portion 80 by spot welding or the like, and the upper ends are notches of the portal portion 70. The locking portions 87a and 87b are configured to protrude inward from the portions 79a and 79b.
In addition, the insertion port 88 of the fire detector 1 formed by the height of the base 66, the width of the vertical walls 72a and 72b, and the peripheral wall 81 of the frame 80 can fit the above-described rectangular parallelepiped fire detector 1. It is formed in size. In this case, the length direction of the insertion port 88 may be formed slightly larger than the width of the fire detector 1.
[0035]
As shown in FIG. 7, the elastic metal fitting 67 is made of an elastic material such as stainless steel and has a pair of substantially inverted V-shaped elastic portions 91a and 91b whose upper end portions are flat and both elastic portions 91a and 91b. The lower ends of the connecting portions 92a and 92b are bent inward to form fixed pieces 93a and 93b. Reference numerals 94a and 94b denote locking pieces formed by extending substantially the center portions of the connecting portions 92a and 92b without bending, and the lower end portions thereof are located on substantially the same plane as the fixed pieces 93a and 93b. . Reference numerals 95a and 95b denote screw holes provided in the upper flat portion.
[0036]
Next, an example of a procedure for mounting the fire detector 1 between the T bars on the system ceiling using the mounting device 65 as described above will be described.
(1) First, as shown in FIG. 8, the base 66 with the terminal block 68 attached to the top plate 71 is inserted between the elastic portions 91a and 91b of the elastic metal fitting 67 from below, and the screw insertion hole 76a of the base 66 is inserted. 76b, screws 111a and 111b are inserted from below and lightly screwed into the screw holes 95a and 95b of the elastic portions 91a and 91b.
[0037]
(2) The elastic fitting 67 is pulled up until the lower end of the elastic fitting 67 reaches the upper end of the frame portion 80 of the base 66, and is pressed with two fingers so that the elastic portions 91a and 91b are substantially vertical. Then, the elastic fitting 67 is lowered, and the locking pieces 94 a and 94 b are inserted into the peripheral wall 81 of the frame portion 80 of the base 66 and locked. Thereby, the width of the elastic metal fitting 67 becomes narrower than the width of the peripheral wall 81 of the frame portion 80.
[0038]
(3) In this state, a common wire or the like drawn from between the T bars 69a and 69b on the system ceiling is connected to the terminal block 68, and as shown in FIG. 9, the mounting device 65 is connected from between the T bars 69a and 69b. Inserted, the flange portion 82 provided at the lower end of the base 66 is brought into contact with the lower surfaces of the T bars 69a and 69b. When the fixing pieces 93a and 93b of the elastic metal fitting 67 are pushed up from below, the engagement of the engagement pieces 94a and 94b is released, and the elastic metal piece 67 returns to its original state as shown in FIG.
[0039]
(4) Next, when a screwdriver 111 is inserted through the insertion port 88 of the base 66 and the screws 111a and 111b are screwed in, the elastic fitting 67 is lowered and the fixing pieces 93a and 93b are brought into contact with the upper surfaces of the T bars 69a and 69b. The T bars 69a and 69b are clamped by the flange portion 82 of the base 66. When the screws 111a and 111b are further screwed in, the flange portion 82 and the fixing pieces 93a and 93b are pressed against the T bars 69a and 69b, and the mounting device 65 is firmly fixed between the T bars 69a and 69b.
[0040]
(5) In this state, if the fire detector 1 is inserted and pushed into the insertion port 88 of the base 66 from below, the connector 33 is connected to the terminal block 68, and the locking holes 14a, The leaf springs 86a and 86b provided on the base 66 are engaged with 14b, and the fire detector 1 is securely held by the mounting device 65 as shown in FIGS.
At this time, the flange portion 82 of the base 66 is exposed on the lower surfaces of the T bars 69 a and 69 b, and only the smoke introduction portion 7 of the fire detector 1 protrudes from between the flange portions 82.
[0041]
When the fire detector 1 is inserted into the attachment device 65, the guide pieces 77a, 77b, 78a, 78b provided on the base 66 of the attachment device 65 and the guide portions 59a, 59b, 61a of the fire detector 1 are used. , 61b are guided, and can be smoothly inserted and attached.
[0042]
When the fire detector 1 is taken out of the attachment device 65 for maintenance inspection, etc., the leaf springs 86a, 86b of the attachment device 65 are elastically deformed outward to release the engagement with the engagement portions 14a, 14b. If the sensor 1 is pulled out, it can be easily taken out.
[0043]
In the above description, the case where the locking portions 87a and 87b are provided below the vertical walls 72a and 72b of the gate-shaped portion 70 is shown, but depending on the positions of the locking portions 14a and 14b of the fire detector 1 as appropriate. Can be changed.
Moreover, although the case where the lower end part of the elastic parts 91a and 91b of the elastic metal fitting 67 was connected by the connection members 92a and 92b was shown, the connection members 92a and 92b are omitted, and the elastic metal fittings are formed by two independent elastic parts 91a and 91b. 67 may be configured.
Further, in the above-described embodiment, the case where the fire detector 1 is attached between the T bars 69a and 69b has been described. However, the fire detector 1 can be similarly attached to a hole provided in the ceiling or the like.
[0044]
Next, the operation of the fire detector 1 attached between the T bars 69a and 69b as described above will be described with reference to FIGS. When a fire occurs indoors, the smoke generated by the fire rises on the rising airflow caused by the heat at the time of the fire, and a plurality of smoke inlets 47 are connected via the wire mesh 49 provided in the smoke introduction part 7 of the fire detector 1. From the inside of the smoke introduction part 7. At this time, since the inside of the smoke introduction part 7 is partitioned into seven rooms by the partition walls 51a and 51b, the smoke flowing from one smoke introduction port 47 may be pushed out by the smoke flowing from another smoke introduction port 47. In addition, all the smoke that has flowed into the smoke inlet 47 flows smoothly toward the labyrinth 27 installed above.
[0045]
The smoke that has passed through the smoke introduction part 7 is guided to the guide pieces 41 a and 41 b provided on the lower inner side of the both side walls of the cover 5 and introduced into the labyrinth 27 through the wire mesh 25. The smoke introduced into the labyrinth 27 passes through the smoke introduction part 7 and the two wire meshes 49 and 25 attached to the outer periphery of the labyrinth 27, so that dust contained in the smoke is captured by these wire meshes 49 and 25. Thus, it does not enter the labyrinth 27, and malfunction caused by dust can be prevented.
[0046]
In the labyrinth 27, the light emitting element 21 emits light periodically (for example, every 3.5 seconds), and this light is scattered and reflected by the smoke that has flowed in. The smoke reaches the light receiving element 23 to detect smoke. Thus, since the light emitting element 21 emits light periodically, it is necessary to cause the smoke introduced into the labyrinth 27 to stay in the labyrinth 27 for a certain period of time. In this respect, in this embodiment, the cover 5 Since the partition wall 39 is provided almost at the center, the partition wall 39 becomes a resistance and the smoke introduced into the labyrinth 27 does not immediately flow out but stays in the labyrinth 27 for a certain time. Thereafter, the smoke passes through the recessed portion 39a provided in the central portion of the partition wall 39, and further passes through the recessed portion 43a provided in the fitting portion 43 of the connector and is discharged to the outside.
[0047]
In addition, when the smoke staying in the labyrinth 27 falls within the labyrinth 27 without being discharged upward, the smoke particles adhere to the light emitting element 21, the light receiving element 23 (lens 29), or the light shielding element 31. However, there is a problem of adversely affecting the sensitivity of the fire detector. That is, when smoke particles adhere to the light emitting element 21, the amount of light emitted in the labyrinth 27 is reduced and the detection sensitivity is deteriorated. In addition, when the light adheres to the light shield 31, the light emitted from the light emitting element 21 may be scattered by the adhering smoke particles, or conversely, may be shielded from light. Deteriorate. Furthermore, when adhering to the light receiving element 23 (lens 29), the amount of received light that is input to the light receiving element 23 by the adhering smoke particles is reduced, so that the detection sensitivity is deteriorated.
However, in this embodiment, the light emitting element 21 is arranged so that the optical axis thereof is substantially horizontal, and the light receiving element 23 is arranged so that the light introduction portion faces downward as is apparent from FIG. Since they are arranged, smoke particles are less likely to adhere, and the above-described problems are unlikely to occur. The light receiving element 23 may be disposed so that the optical axis thereof is substantially horizontal, or the light axes of the light emitting element 21 and the light receiving element 23 may be disposed downward.
[0048]
【The invention's effect】
As is clear from the above description, according to the present invention, the following effects can be obtained.
[0052]
In the first aspect of the invention, the smoke introduced into the smoke detector does not immediately flow upward by the partition provided in the main body and above the smoke detector, so that the smoke introduced into the smoke detector emits light. during the cycle time element emits light, will be retained in the smoke detection portion can reliably detect the flame.
[0053]
Further, in the second invention, since the small hole is provided in the partition wall , the smoke can stay in the smoke detecting part for a certain period of time and smoothly pass through. Can be detected quickly.
[0055]
Furthermore, in the third aspect of the invention, since the partition that divides the inside of the smoke introduction section into a room corresponding to the smoke introduction port and a room in which the indicator light is accommodated is provided, the indicator light is lit without being affected by the smoke. Easy to check.
[Brief description of the drawings]
FIG. 1 is a perspective view of an embodiment of the present invention.
FIG. 2 is an exploded view of the embodiment shown in FIG.
FIG. 3 is an exploded view of the embodiment shown in FIG. 1;
FIG. 4 is a front view of the mounting device of the present embodiment.
FIG. 5 is a side view of the mounting device of the present embodiment.
FIG. 6 is a perspective view of a portal portion that constitutes the attachment device of the present embodiment.
FIG. 7 is a perspective view of an elastic fitting constituting the attachment device of the present embodiment.
FIG. 8 is an operation explanatory diagram of the present invention.
FIG. 9 is a diagram illustrating the operation of the present invention.
FIG. 10 is a cross-sectional view of a conventional fire detector.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fire detector 7 Smoke introduction part 21 Light emitting element 23 Light receiving element 27 Labyrinth 25, 49 Wire net 47 Smoke inlet 51a, 51b Bulkhead 53 Confirmation hole

Claims (3)

A smoke introduction section comprising a box having a plurality of smoke introduction openings on the peripheral surface and having an upper opening, and a smoke detection provided above the smoke introduction section to detect smoke introduced from the smoke introduction section A main body part for housing the part,
A fire detector, comprising a partition wall for preventing smoke introduced into the smoke detector section from flowing out immediately in the main body section and immediately above the smoke detector section. A fire sensor characterized in that a small hole is provided in the partition wall . A smoke introduction section comprising a box having a plurality of smoke introduction openings on the peripheral surface and having an upper opening, and a smoke detection provided above the smoke introduction section to detect smoke introduced from the smoke introduction section And an indicator lamp that lights up when smoke is detected at the smoke detector,
A fire detector comprising a partition that divides the inside of the smoke introduction section into a room corresponding to the smoke introduction port and a room in which the indicator lamp is accommodated .

Images