JP3035458B2 - Photoelectric smoke detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photoelectric smoke detector having a light emitting element and a light receiving element for detecting smoke, and a warning indicator lamp.

[0002]

2. Description of the Related Art As a conventional photoelectric smoke detector, there is, for example, one described in Japanese Patent Application Laid-Open No. 2-257399. In other words, this sensor has a heat sensing section that detects heat due to a fire and outputs a fire detection signal, and a circuit section that sends a fire detection signal from the heat sensing section to a receiver via a transmission path in the sensor body. And a circuit storage section that houses the circuit section in a state of being isolated from the outside by attaching a lid with a waterproof structure, and an indicator light that is incorporated in the circuit storage section and illuminates when a fire is detected and displays an alarm display outside A display window member made of a transparent or semi-transparent material formed in advance is insert-molded on a part of the sensor main body facing the indicator light provided in the circuit housing when the sensor main body is molded. Thus, an annular flange is formed on the periphery of a portion embedded in the main body of the display window member.

Further, another sensor has a prism portion made of a transparent or translucent material formed in advance on a part of a main body opposed to an indicator light provided in a circuit housing portion, and a prism orthogonal to an incidence surface of the prism portion. A display window member integrally provided with a guide portion for positioning an indicator light in a direction to be integrated by insert molding when molding the sensor main body, and further embedded in the main body of the guide portion of the display window member. An annular flange is formed on the periphery of the part.

Accordingly, in such a sensor, the display window member made of a transparent or translucent material is integrally formed by insert molding of the display window member when molding the main body. It is only necessary to incorporate the indicator light inside the display window in opposition to the position where the display window is formed, and it is not necessary to provide a special waterproof structure or filling with an adhesive for assembling the indicator light, thereby greatly improving the work efficiency.

[0005] Further, since a flange is projected around a portion of the display window member buried in the main body, a boundary dimension of a contact portion between the main body and the display window member can be lengthened, and a different resin material can be used. Infiltration of moisture that permeates the boundary can be reliably prevented.
Further, by insert-molding the display window member having the prism structure, the indicator lamp, which was conventionally provided in the downward direction, can be provided in the horizontal direction, and the indicator lamp can be laid in the horizontal direction, so that the dimension of the circuit housing portion in the height direction can be obtained. Can be reduced in size.

[0006]

However, in such a conventional sensor, when the display unit structure is diverted to a smoke sensor, the structure of assembling each component of the smoke sensor is complicated. Also, since the smoke detector of the smoke detector is larger than the heat detector of the heat detector, there is a problem that the smoke detector cannot be easily diverted.

The present invention has been made in view of such a conventional problem, and realizes a waterproof display structure even in a smoke detector and inserts a light into a terminal board. An object of the present invention is to provide a photoelectric smoke detector that facilitates positioning and improves assemblability by using a guide member as a positioning member when fitting a terminal board and a smoke detection unit main body. .

[0008]

In order to achieve the above object, the present invention provides a terminal board housed in an outer cover and having a fitting groove, and a terminal board having a light receiving component and a light emitting component and fitted in the fitting groove. A photoelectric detection unit having a smoke detection unit main body, a printed circuit board housed in a storage unit formed in the terminal board and having an alarm indicator, and a smoke detection unit cover attached to the smoke detection unit main unit. A light guide member that guides light from the alarm indicator light into the terminal board by insert molding, and also functions as a positioning member when the terminal board and the smoke detection section main body are fitted. It is.

Further, in the present invention, a notch into which the light guide member is inserted is formed on an outer peripheral wall of the smoke detecting section main body. Also, the present invention provides the alarm indicator lamp, the light guide member, and the notch in a symmetrical manner, respectively, and a window for the alarm indicator lamp into which the protrusion of the light guide member is inserted into the outer cover. Are provided symmetrically.

[0010]

According to the photoelectric smoke detector of the present invention having such a configuration, the light guide member for guiding the light from the alarm indicator lamp is insert-molded in the terminal board, and the terminal board and the smoke detection section main body are formed. Since the function as a positioning member is also used at the time of fitting, the positioning of the smoke detection section main body with respect to the terminal board becomes easy, and assemblability can be improved.

Further, since the notch into which the light guide member is inserted is formed on the outer peripheral wall of the smoke detection section main body, positioning can be easily performed by inserting the light guide member into the notch. In addition, the present invention provides a warning indicator light, a light guide member, and a notch symmetrically, and a window for the warning indicator light into which the protrusion of the light guide member is inserted into the outer cover, respectively, symmetrically. With the provision, the alarm display can be easily checked from the 360-degree direction.

Further, even with a smoke detector, it is possible to realize a waterproof display structure.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 are views showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the main body of the smoke detection section showing one embodiment of the present invention;
FIG. 3 is a vertical sectional view of a photoelectric smoke detector showing one embodiment of the present invention.

2 and 3, reference numeral 1 denotes an outer cover having an opening 2. A terminal board 3 is accommodated in the outer cover 1, and a shield case 4 is fixed inside the terminal board 3. Reference numeral 5 denotes a smoke detection section main body. The smoke detection section main body 5 is fitted into the fitting groove 6 of the terminal board 3, and a packing 7 is placed on the smoke detection section main body 5.
The printed circuit board 8 is attached via the. The smoke detection unit main body 5, the packing 7, the printed circuit board 8, the terminal board 3, and the fitting 9 are fixed by screws 10. A smoke detection unit cover 11 is detachably attached to the lower surface of the smoke detection unit main body 5.

A plurality of labyrinth members 13 are formed inside the peripheral wall 12 of the smoke detector cover 11, and the labyrinth members 1
Numeral 3 is formed so that smoke from the outside is easily introduced and light from the outside is blocked. An insect screen 14 is integrally provided outside the peripheral wall 12 of the smoke detection section cover 11 to prevent insects from entering and generating scattered light. Further, a plurality of smoke inlets 15 are formed in the peripheral wall 12 of the smoke detection unit cover 11.

On the lower surface of the smoke detector main body 5, holders 16, 1 are provided.
7, the light shielding member 18 and the mounting portion 19 are integrally formed,
The holder 16 houses a light receiving element 20 and a test infrared LED, and the holder 17 houses a smoke detection infrared LED 21. The light shielding member 18 is a smoke detection infrared LED 21.
Is shielded so that infrared light irradiated from the light source does not directly enter the light receiving element 20. The protrusion 22 formed on the smoke detection section cover 11 is inserted into the mounting section 19, and the smoke detection section cover 11 is detachably attached to the smoke detection section main body 5.

The lower surface of the smoke detector main body 5 and the smoke detector cover 1
Antireflection surfaces 23 and 24 each having a saw-tooth cross section are formed on the inner surface of the light-receiving device 1. The light is prevented from being incident on the element 20. A space surrounded by the antireflection surfaces 23 and 24, the plurality of labyrinth members 13, the holders 16 and 17, and the like forms a smoke detection chamber 25A. A smoke detection space 25 is formed at the center of the smoke detection chamber 25A.

A light receiving unit cover 26 is detachably mounted on the holder 16 in which the light receiving element 20 is housed, and a shield cap 27 is mounted on the light receiving unit cover 26. Next, FIG. 4 is a sectional perspective view of a main part. In FIG. 4, reference numeral 3 denotes a terminal board, on which a fitting groove 6 is formed. Reference numeral 5 denotes a smoke detector main body, and an outer peripheral wall 28 is formed on the smoke detector main body 5. By fitting the outer peripheral wall 28 of the smoke detection section main body 5 into the fitting groove 6 of the terminal board 3, the smoke detection section main body 5 is fitted to the terminal board 3.
Is fixed. The terminal board 3 has a storage section 2
9 are formed, and the packing 7 and the printed circuit board 8 are stored in the storage section 29.

On the outer peripheral end surface of the printed circuit board 8, there is provided a warning indicator lamp 30 which is turned on when a fire is detected, and is an LED for displaying a warning. A light guide member 31 is provided on the terminal board 3 to guide the light from the alarm display light 30 at a predetermined interval from the alarm display light 30, and the light guide member 31 is formed by molding the terminal board 3. In this case, they are embedded and integrated by insert molding.

That is, the light guide member 31 is molded in advance using a transparent or translucent synthetic resin, and when the terminal board 3 is molded, the light guide member 31 molded in advance is set in a mold. The so-called insert molding is performed. The light guide member 31 is formed in a substantially L-shape, and has an incident surface 32 on which light from the alarm indicator light 30 is incident, a guide portion 33 for guiding the light incident on the incident surface 32, and a bent portion from the guide portion 33. Projecting part 3
4

The entrance surface 31 is formed on a peripheral wall 35 inside the fitting groove 6.
Are arranged along the opening 36 of the alarm device, and face the alarm indicator 30. The guide part 32 is inserted through the fitting groove 6 and is inserted into a not-shown notch formed in the outer peripheral wall 28 of the smoke detection part main body 5. Light guide part 3
As shown by an arrow A in FIG. 4, the guide 1 guides the light from the alarm display lamp 30 and also functions as a positioning member when the terminal board 3 and the smoke detection section main body 5 are fitted.

Next, FIG. 1 shows a state in which the terminal board 3 and the smoke detection section main body 5 are fitted. In FIG. 1, reference numeral 3 denotes a terminal board, and a smoke detection unit main body 5 is fitted to the terminal board 3. A printed board 8 is provided on the upper surface of the smoke detection unit main body 5 with a packing 7 interposed therebetween. A warning indicator light 30 is provided on the outer peripheral end surface of the printed circuit board 8, and a light guide member 31 is insert-molded on the terminal board 3 so as to face the warning indicator light 30.
That is, the light guide member 31 penetrates the fitting groove 6 of the terminal board 3 and is embedded in the terminal board 3 by insert molding.

The light guide member 31 is inserted into a notch 37 formed in the outer peripheral wall 28 of the smoke detection section main body 5, and
The smoke detection unit main body 5 is positioned with respect to. The projecting portion 34 of the light guide member 31 is inserted into a window 38 for an alarm indicator lamp formed on the outer cover 1. Accordingly, the light of the alarm indicator 30 passes through the light guide member 31 and exits through the window 38 as shown by the arrow A.

When it is desired to check the alarm display from the 360-degree direction, as shown in the figure, the alarm display lamp 30A, the light guide member 31A, the notch 37A,
And a window 38A. The light guide member 31 guides the light of the alarm indicator lamp 30 and is inserted into a notch 37 formed in the outer peripheral wall 28 of the smoke detection section main body 5 so as to also serve as a positioning member for performing positioning. Therefore, the positioning of the smoke detection section main body 5 with respect to the terminal board 3 becomes easy, and the assemblability of the detector can be improved.

Next, FIG. 5 is an explanatory view of the assembly of the photoelectric smoke detector. In FIG. 5, the terminal board 3 has a mounting portion for mounting a fitting 9 for mechanical and electrical connection with a base separately mounted on the ceiling surface on an upper surface, and a smoke detection portion on a lower surface. It has a fitting groove 6 in which the main body 5 fits, a mounting portion 42 in which the smoke detection unit main body 5 and the like are mounted, and a storage portion 29 for storing the printed circuit board 8 on which an electric circuit is mounted.

The terminal board 3 is provided with a light guide member 31 which guides light from the alarm indicator lamp 30 and also functions as a positioning member. That is, the light guide member 31 is embedded and integrated by insert molding when the terminal board 3 is molded. The shield case 4 is inserted into the housing portion 29 of the terminal board 3 along the inner peripheral surface thereof, and the printed circuit board 8 is housed inside the shield case 4. The smoke detection unit main body 5 is fitted into the fitting groove 6 of the terminal board 3, and the smoke detection unit main body 5, the packing 7, the printed circuit board 8, and the fitting 9 are fixed to the terminal board 3 by screws 10. You.

Holders 16 and 17 and a light blocking member 18 are provided upright on the smoke detection section main body 5, an antireflection surface 23 is formed on a lower surface, and a mounting portion 19 is formed on an outer periphery in a circumferential direction. The holder 17 accommodates the infrared LED 21 for smoke detection, and the holder 16 has a light emitting unit cover 39 covering the infrared LED 21 for smoke detection. The light receiving element 20 and the test infrared LED 40 are housed in the holder 16, and the holder 16 is provided with a light receiving section cover 26 for limiting the field of view of the light receiving element 20 and introducing smoke. The light receiving unit cover 26 is detachably attached to the holder 16. Further, a shield cap 27 is attached to the light receiving unit cover 26.

Here, the fitting of the terminal board 3 and the smoke detection section main body 5 is performed by fitting the outer peripheral wall 28 of the smoke detection section main body 5 into the fitting groove 6 of the terminal board 3. At this time, the light guide member 31 is inserted into the notch 37 of the outer peripheral wall 28 of the smoke detection section main body 5 to position the smoke detection section main body 5 with respect to the terminal board 3. In this manner, the terminal board 3 and the smoke detection section main body 5 can be easily fitted.

The projection 22 of the smoke detection section cover 11 is inserted into the attachment section 19 of the smoke detection section main body 5, and the smoke detection section cover 11 is detachably attached to the smoke detection section main body 5. The insect detection net 14 is fixed to the outer periphery of the smoke detection unit cover 11. Finally, the outer cover 1 having the opening 2 is attached to the terminal board 3 to cover the smoke detector main body 5 and the smoke detector cover 11.

In this case, as shown in FIG. 1, a light guide member 3 is provided in a window 38 for alarm display formed in the outer cover 1.
The one projection 34 is inserted, and the warning display can be confirmed from the window 38. In addition, windows 38 and 38A for alarm display are provided.
May be provided symmetrically at two places on the left and right so that the alarm display can be confirmed from a 360-degree direction. A drain hole 41 is formed in the outer cover 1.

Next, the operation will be described. In the monitoring state, the infrared LED 21 for smoke detection is intermittently driven by control of an electronic circuit on the printed circuit board 8, and the infrared LED 21 for smoke detection irradiates the smoke detection space 25 intermittently. If there is no smoke in the smoke detection space 25, the emitted infrared light does not directly enter the light receiving element 20, so that the output level of the detector is a level corresponding to that the smoke density is zero. It is in.

When smoke is generated outside the sensor due to a fire or the like, the smoke flows through the opening 2 of the outer cover 1, the insect net 14, the smoke inlet 15 of the smoke detector cover 11, and the labyrinth member 13.
And enters the smoke detection space 25. In the smoke detection space 25, infrared light is intermittently emitted from the infrared LED 21 for smoke detection.
When this infrared light is applied, scattering by smoke particles occurs, and the scattered light is caught by the light receiving section cover 26 and the light receiving element 2
0 is incident on the light receiving surface.

This light is photoelectrically converted by the light receiving element 20 and detected by the light receiving circuit. The detection signal is amplified by the amplifier circuit and applied to the transmission control circuit. The transmission control circuit transmits the response signal to the receiver via the response signal output circuit. At the same time, it is output to the alarm indicator 30. When the alarm indicator lamp 30 emits light, the light is transmitted to the entrance surface 3 of the light guide member 31.
2 and guided by the guide portion 33 to form the protrusion 34
Through the window 38 to the outside. Thus, it is possible to confirm that the alarm indicator 30 has issued the alarm.

In this case, a light guide member 31 for guiding the light from the alarm indicator lamp 30 is insert-molded in the terminal board 3, and when the terminal board 3 and the smoke detection section main body 5 are fitted together, the light guide member 31 is Notch 3 of outer peripheral wall 28 of smoke detector main body 5
7, the terminal board 3 and the smoke detection unit main body 5 can be easily positioned, and the assemblability of the detector can be improved. be able to.

[0035]

As described above, according to the present invention, the light guide member for guiding the light from the alarm indicator lamp is insert-molded in the terminal board, and the terminal board is fitted to the smoke detection section main body. Since the function as the positioning member is sometimes used, the positioning of the smoke detection section main body with respect to the terminal board can be easily performed, and the assemblability of the sensor can be improved. Further, even with a smoke detector, a display unit structure having waterproofness can be realized.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view of the smoke detection unit main body.

FIG. 3 is a longitudinal sectional view of a photoelectric smoke detector.

FIG. 4 is a partial sectional perspective view showing a main part.

FIG. 5 is an explanatory view of assembling a photoelectric smoke detector.

[Explanation of symbols]

 1: Outer cover 2: Opening 3: Terminal board 4: Shield case 5: Smoke detector body 6: Fitting groove 7: Packing 8: Printed circuit board 9: Fitting fitting 10: Screw 11: Smoke detector cover 12: Peripheral wall 13: Labyrinth member 14: Insect repellent net 15: Smoke inlet 16, 17: Holder 18: Light shielding member 19: Mounting part 20: Light receiving element 21: Infrared LED for smoke detection 22: Projection 23, 24: Antireflection surface 25: Smoke detection space 25A: Smoke detection chamber 26: Light receiving unit cover 27: Shield cap 28: Outer peripheral wall 29: Storage unit 30, 30A: Alarm display lamp 31, 31A: Light guide member 32: Incident surface 33: Guide unit 34: Projection 35: Peripheral wall 36: Opening 37, 37A: Notch 38, 38A: Window 39: Light emitting unit cover 40: Infrared LED for test 41: Drain hole 42: Mounting part

Claims (3)

(57) [Claims] 1. A terminal board housed in an outer cover and having a fitting groove, a smoke detector main body having a light receiving component and a light emitting component and fitted in the fitting groove, and formed in the terminal board. A printed circuit board having an alarm indicator housed in a housing and a photoelectric smoke detector having a smoke detector cover attached to the smoke detector main body, wherein the terminal board is provided with light from the alarm indicator. A photoelectric smoke detector, wherein a light guide member for guiding is insert-molded, and also functions as a positioning member when the terminal board and the smoke detection section main body are fitted. 2. The photoelectric smoke detector according to claim 1, wherein a notch into which the light guide member is inserted is formed in an outer peripheral wall of the smoke detecting section main body. 3. The alarm indicator lamp, the light guide member,
2. The notch according to claim 1, wherein the notch is provided symmetrically, and a window for a warning indicator light into which the protrusion of the light guide member is inserted is provided symmetrically in the outer cover. Photoelectric smoke detector.