JP2531687Y2 - Dim smoke detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to a dimmable smoke detector in which a light emitter and a light receiver are separated.

[Prior Art] The transmitter and the receiver of a separate type extinction smoke detector are installed on opposing walls in a large building with a ceiling space of 100 m.
Therefore, a relatively large-diameter lens is arranged on the front of the optical case of the light emitter and the light receiver, and the light receiving element on the light receiver side receives the light projected from the light emitting element in the light emitter and smoke that constantly enters the optical path. It is being monitored.

 FIG. 9 shows a configuration of a main part of a conventional device of this kind.

In FIG. 9, reference numeral 1 denotes a housing of a light receiver, and 2 denotes an optical case. The optical case 2 is generally molded of black resin to remove noise light inside. In order to minimize the space in the housing 1, the optical case 2 is formed in a so-called tapered shape in which the diameter gradually decreases from the front side. Reference numeral 3 denotes a lens arranged on the front surface of the optical case 2, and 4 denotes a light receiving element. The light receiving element 4 is provided at the apex of the cone-shaped optical case 2, and receives a parallel light beam incident on the lens 3.
The focal point F of L1 is formed almost at the position of the light receiving element 4. Also,
An optical case 2 having the same shape is used also in the projector,
A light emitting element 5 is arranged at a position corresponding to the light receiving element 4,
The light projecting element 5 is configured so that parallel projection light irradiates the opposing light receiver.

[Problem to be Solved by the Invention] As described above, the conical optical case 2 is used as the light-emitting / receiving device of the conventional separated-type light-attenuating smoke detector. The lens 3 is attached to the front surface of the optical case 2, and the light emitting and receiving elements 4, 5 are provided at the apex positions. Therefore, when the sunlight L2 irradiates the lens 3 at an angle θ close to the optical axis OO for some reason such as repair work on the ceiling of the building, as shown in FIG. Focus on F
Will be tied. The focus of sunlight L2 is optical case 2
, The conical wall molded of black resin is thermally deformed. In particular, when the sunlight L2 in summer when the sunlight is strong enters the lens 3, there is a problem that the conical wall of the optical case 2 is melted and a fire may be caused.

The present invention has been made in order to solve the above-described problems of the conventional device, and comprises an optical case in which sunlight is not focused, and a dimming type in which deformation and burning do not occur. This is to realize a smoke detector.

[Means for Solving the Problems] In the present invention, a lens is attached to the front surface, held rotatably in the horizontal and vertical directions so as to adjust the horizontal angle and the vertical angle, and projected on the rear side near the focal point of the lens. An optical case with an optical element or a light-receiving element is provided, and a light-transmitting device and a light-receiving device, each of which is housed inside a box attached to a wall or the like, are arranged opposite to each other on the same optical axis. A rotatable center of rotation that is provided in front of the optical case using black resin in the optical case, and the optical case is gradually narrowed from the middle of the outer circumference toward the bottom, and a corner portion communicating with the bottom is provided. And a holder to which a light emitting element or a light receiving element is attached is inserted by protruding inside the bowl bottom so that an annular space is formed between the cup part formed into a bowl shape by bending the bowl. And a cylindrical boss with a mounting hole This is a configuration of a reduced light smoke detector.

[Operation] The oblique sunlight near the optical axis may irradiate the lens of the light receiver or the light projector. At this time, the focal point of the sunlight incident on the lens is separated from the side wall of the optical case and is formed in the vicinity of a space surrounding the light emitting / receiving element.

[Embodiment] FIG. 1 is an explanatory view of the configuration of an embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof.

In FIG. 1, reference numeral 1 denotes a main body of a dimming smoke detector.
The internal structure of the main body 1 is shown exploded in FIG.
2, 3 is a mounting plate, 4 is a container frame, and 5 is a cover (No. 1,6).
Figure). Reference numeral 7 denotes two terminal blocks fixed to the mounting plate 3, 8 denotes a wire outlet, and 9 denotes two hook pieces. Reference numeral 11 denotes a suspension groove opened to the outlet 8, and reference numeral 12 denotes a note-like mounting hole provided with an adjustment groove 13, both of which are provided on the left and right. 2
Reference numeral 15 denotes a switch box (or outlet box), 16 denotes a pair of upper and lower screws, and 17 and 18 denote fixing pieces and screws provided on the bottom surface (FIG. 7). Reference numerals 19 and 20 denote suspension screws and mounting screws, which are provided in the switch box 15 and the like corresponding to the suspension grooves 11 and the mounting holes 12. The mounting plate 3 attaches the main body 1 to the switch box 15 or a wall surface or the like, and connects an electric wire to a connection terminal of the terminal block 7 to constitute an input / output unit.

Reference numeral 21 denotes a first turntable provided on the casing 4, 22 denotes a second turntable, and 23 denotes a rotation shaft. Reference numeral 24 denotes two sliding grooves formed in the first turntable 21, reference numeral 25 denotes a set screw, reference numeral 26 denotes a horizontal adjustment screw for fine adjustment, reference numeral 27 denotes a spring, and reference numeral 28 denotes an insertion hole. 31 is the second turntable 22
Left and right bearing holes, 32 and 33 are screw holes provided in the bent part,
34 is a vertical angle adjusting screw, and 35 is a spring. In the screw hole 32,
The horizontal angle adjusting screw 26 inserted into the insertion hole 28 is screwed.
Reference numeral 36 denotes two support plates protruding left and right, and 37 denotes a hook hole.

Reference numeral 38 denotes an operation unit, and a printed board 41 is provided inside the casing 4. Reference numerals 42 and 43 are a flame lamp and a trouble lamp, 44 is a monitoring / adjustment changeover switch, 45 is a reset switch, and 46 is a distance setting changeover switch. Reference numerals 47 and 48 denote volumes for coarse adjustment and fine adjustment, 51 denotes a sensor output terminal, and 52 denotes a standby power supply terminal.

Reference numeral 53 denotes an optical case, which comprises a peripheral cup portion 53a and an internal boss portion 53b. FIGS. 3A and 3B show four views of the optical case 53 (see also FIG. 3). 54 is a Fresnel lens attached to the front of the cup 53a, 55
Is a shaft pin, 56 is a vertical angle adjustment screw similar to the insertion hole 28
Insertion holes for 34, 57 are three comb bars provided on both sides of the body portion for hooking and holding lead wires, and 58 is a mounting hole. Here, a black synthetic resin is used for the optical case 53, and the outer periphery of the cup portion 53a is gradually narrowed from the middle toward the bottom, and the corners leading to the bottom are curved and molded into a bowl shape. ing.
A cylindrical boss 53b protrudes concentrically inside a portion corresponding to the bowl bottom of the cup 53a, and a mounting hole 58 is formed inside the boss 53b. For this reason, an annular space portion 59 is provided around the periphery of the boss portion 53b from the protruding surface thereof (FIG. 5). The optical case 53 fits the shaft pin 55 into the bearing hole 31 of the second turntable 22, and the shaft pin 55
It is held rotatably around 55. Reference numeral 61 denotes a ring-shaped stopper formed on the inner surface of the mounting hole 58, and 62 denotes three locking claws provided with elasticity by cutting grooves.

63 is a cylindrical holder, 64 is a notch, 65 is a partition, 66 and 67
Is a mount, and 71 and 72 are outlet holes (FIG. 4). In FIG. 5, 73 is a light emitting element, 74 is a light receiving element, and 75 is a circular printed board. The holder 63 is also used for the light emitter and the light receiver, and the light emitting element 73 and the light receiving element 74 are mounted on one of the mounts 67 or 66 on the partition wall 65.
And the two lead wires are respectively connected to the outlet holes 71
Alternatively, it is derived from 72 and connected to the printed board 75. Then, a holder 63 to which the light emitting element 73 or the light receiving element 74 is attached.
Is inserted into the mounting hole 58 from the rear surface to the position of the stopper 61, and the notch 64 and the rear surface of the printed board 75 are engaged with the locking claws 62 to be mounted on the optical case 53. 76 is a collimation unit, 77 is a viewing window, 78 is a reflector, and 79 is a sighting hole.

81 is a box of the cover 5, 82 is a mounting groove formed in the box 81, 83 is a window, and 84 is a door. 85 and 86 are display windows of the fire light 42 and the trouble light 43.

The light receiver of the present invention having such a configuration is connected to a switch box.
The assembling / adjusting operation will be described below by exemplifying the case where the mounting is performed at 15 (FIG. 7).

In advance, a pair of hanging screws above and below the switch box 15
Attach 19 and mounting screws 20 and place. Hanging screw 19 and mounting screw
If the suspension screw 19 and the mounting screw 20 are tightened with the suspension groove 11 of the mounting plate 3 and the adjustment groove 13 of the mounting hole 12 corresponding to each other, the mounting plate 3
Are vertically fixed to the mounting surface of the switch box 15. Thereafter, an electric wire from the receiver or the projector side is drawn out from the outlet 8 and screwed to a predetermined connection terminal of the terminal block 7 already mounted on the mounting plate 3.

On the other hand, the two setscrews 25 of the casing 4 are loosened and the first turntable 21
Is rotated about the rotating shaft 23 along the sliding groove 24 to roughly align the optical axis, and then tighten the set screw 25 again. Next, the casing 4 is lifted, and the hook holes 37 of the left and right support plates 36 are hooked on the hook pieces 9 on the mounting plate 3 side.
The internal unit is mounted on the mounting plate 3 by screwing the connector 18, and then the printed board 41 is connected to the terminal block 7 by a connector (not shown). Similarly, as shown in FIG. 5 (A), the inner unit of the projector on which the light emitting element 73 is mounted is mounted on the opposing wall separated by 5 to 100 m in a building having a large ceiling space via the mounting plate 3. Mounted. Thereafter, fine adjustment and sensitivity adjustment of the optical axes of the light receiver and the light emitter mounted on the opposing wall surface are performed. In this case, the fine adjustment of the optical axis is performed by rotating the horizontal angle adjustment screw 26 and the vertical angle adjustment screw 34 to relatively rotate the rotation axis positioned in front of the optical case 53.
The adjustment is carried out by changing the horizontal angle of the vertical angle of the optical case 53 with the rotation of the optical pin 53 as the center of rotation of the optical pin 53 and the shaft pin 55.

In this way, the light receiver installed on the wall facing the light emitter of the building continuously monitors the smoke in the monitoring area while receiving the pulse light from the light emitter in the operating state. Then, when smoke accompanying the fire enters the optical path, the amount of light received by the light receiver is attenuated and the fire is detected.

In this case, sunlight L2 oblique to the optical axis OO as shown in FIG.
May be irradiated. At this time, the focal point F of the sunlight L2 that has entered the lens 54 is formed in the vicinity of the space 59 distant from the side wall of the optical case 53, as illustrated.

In the above-described embodiment, the optical case 53 has a bowl shape with a round bottom. However, the shape is not necessarily limited to the shape of the embodiment drawing. What is necessary is just to provide the space for focusing.

[Effects of the Invention] In the present invention, a lens is mounted on a front surface, which is rotatable in a horizontal direction and a vertical direction so that a horizontal angle and a vertical angle can be adjusted, and a light emitting element or a light receiving device is provided on a rear side near a focal point of the lens. A dimming smoke detector in which an optical case in which elements are arranged is provided, and a light emitter and a light receiver, each of which is accommodated in a box attached to a wall or the like, are opposed to each other on the same optical axis. By using a black resin in the optical case, a rotatable center of rotation is provided in the front, and the optical case is gradually narrowed from the middle of the outer periphery toward the bottom, and the corners leading to the bottom are curved. A mounting hole into which a holder to which a light-emitting element or a light-receiving element is attached is inserted so as to protrude inside the bottom of the bowl so that an annular space is formed between the cup shaped like a bowl and the cup. Dimmable smoke detection consisting of a cylindrical boss formed The vessel was constructed.

As a result, even when sunlight oblique to the optical axis enters the optical case, the sunlight is not focused on the optical case. Therefore, unlike the conventional apparatus using the conical optical case, an accident such as deformation or burning of the optical case does not occur.

Therefore, according to the present invention, it is possible to provide a dimming type smoke detector without an accident such as a fire caused by deformation of the optical case or burning. In addition, since the cup portion of the optical case is gradually narrowed from the middle to the bottom so as to have a bowl shape, there is an advantage that an internal space of the apparatus is not extremely occupied and a burnout accident can be prevented.

[Brief description of the drawings]

1 is an explanatory view of the configuration of the embodiment of the present invention, FIG. 2 is an exploded perspective view of FIG. 1, FIG. 3 is an explanatory view of an optical case, (A) is a top view, (B) is a front view, (C) is a left side view, (D) is a right side sectional view, FIG. 4 is an explanatory view of a holder, (A) is a front view, (B) is a right side sectional view, (C) is a rear view, and FIG. The figure is a cross-sectional view of a part of the optical case, (A) is a cross-sectional view of the projector,
(B) is a cross-sectional view of the light receiver, FIG. 6 is a perspective view of the case, FIG. 7 is an explanatory view of the configuration of the mounting plate, FIG. 8 is an explanatory view of the operation of the embodiment of the present invention, and FIG. FIG. 10 is an explanatory diagram of the configuration, and FIG. 10 is an explanatory diagram of the operation of the conventional device. In the figure, 1 is a main body, 3 is a mounting plate, 4 is a frame, 5 is a cover, 21 is a first turntable, 22 is a second turntable, 26 is a horizontal angle adjustment screw, 34 is a vertical angle adjustment screw, 38 Is an operation unit, 53 is an optical case, 54 is a lens, 59 is a space, 73 is a light emitting element, 74 is a light receiving element, and 76 is a collimation unit.

Claims (1)

(57) [Scope of request for utility model registration] 1. A lens is mounted on a front surface of a lens and is rotatable in a horizontal direction and a vertical direction so that a horizontal angle and a vertical angle can be adjusted. A light emitting element or a light receiving element is disposed on a rear side near a focal point of the lens. A light reducing type smoke detector in which an optical case is provided, and a light emitter and a light receiver, each of which is accommodated in a box body attached to a wall surface or the like, are disposed opposite to each other on the same optical axis, The center of the rotatable rotation is provided forward using a black resin in the case, and the optical case is gradually narrowed from the middle of the outer periphery toward the bottom, and the corners leading to the bottom are curved and the bowl is bent. A mounting hole into which a holder to which the light-emitting element or the light-receiving element is attached is inserted so as to protrude into the bottom of the bowl so that an annular space is formed between the cup-shaped part and the cup-shaped part. And a cylindrical boss formed with Dimming smoke sensor according to claim.