JP2002197558A - Fire alarm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire alarm which makes it possible to confirm the operation of a smoke detecting circuit through easy operation. SOLUTION: The fire alarm 1 is equipped with a smoke detection chamber 2 having an infrared LED element 3 and a photodiode element 4 which is irradiated by the infrared LED element 3 and receives light scattered by smoke entering it, and a buzzer which inputs the light reception signal from the photodiode element 4 and outputs an alarm according to the density of the smoke. A test body 7 which tests the operation of the buzzer by reflecting the irradiation light 31 from the infrared LED element 3 and receiving it by the photodiode element 4 is so provided that it can freely be operated from the outside of its main body 5 to exit into the smoke detection chamber 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire alarm and, more particularly, to a light emitting means and a light receiving means for receiving scattered light scattered by smoke emitted from the light emitting means and flowing into the inside thereof. The present invention relates to a fire alarm installed in a house or the like, including a smoke detection room having the same, and alarm means for inputting a light receiving signal from the light receiving means and outputting an alarm according to the concentration of the smoke.

[0002]

2. Description of the Related Art Conventionally, as a fire alarm as described above, as shown in FIG. 6, a main unit 101 formed of a photoelectric smoke detector is provided with a driving power supply such as a battery and a buzzer serving as alarm means. A device which detects the generation of smoke and issues an alarm by providing the alarm device 102 has been proposed.

As shown in FIG. 7, for example, an infrared LED element serving as a light emitting means 106, a photodiode element serving as a light receiving means 107, and a prism lens 108 are provided in the smoke detection room 105 of the fire alarm 100. I have. Then, the scattered light radiated by the infrared LED element and scattered by the smoke flowing into the inside thereof is received by the photodiode element via the prism lens 108, and the smoke detection alarm circuit provided inside the main body 101. The alarm device 102 issues an alarm output according to the concentration of the smoke flowing into the smoke detection chamber 105.

[0004] The fire alarm 100 is provided in a smoke detection room 105.
This switch is installed on the ceiling or wall so that smoke can easily flow into the inside of the battery.However, a switch is used to check the remaining battery capacity and the operation of the alarm device on a daily basis to ensure that an alarm is activated when a fire occurs. Push button 10 for operating SW1
3 and a drawstring 104 interlocked with the operation of the push button 103. That is, the push button 103
The operation of (1) and the operation of pulling the drawstring 104 similarly perform the above-described checking operation, and the checking operation can be easily performed even when the fire alarm 100 is installed at a high place.

[0005]

However, in the above-mentioned prior art, the switch SW1 is operated by the operation of the push button 103 or the drawstring 104, and the signal processing circuit of the battery and the smoke detection alarm circuit shown in FIG. Only the operation of the alarm circuit including the alarm device is checked, and the operation of the smoke detection circuit including the light emitting unit 106 and the light receiving unit 107 shown in FIG. 7 cannot be checked. for that reason,
Even if daily operation check work is performed, for example, when there is a failure of the photodiode, there is a concern that a correct alarm operation may not be performed when a fire occurs, and for checking the operation of the smoke detection circuit, for example, It was necessary to actually operate by generating smoke. Therefore,
When confirming work is performed reliably, there is a problem that it takes time and effort.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fire alarm capable of confirming the operation of a smoke detection circuit by a simple operation.

[0007]

In order to achieve the above object, in the fire alarm according to the present invention, there is provided a light emitting means, and the light emitted by the light emitting means is scattered by smoke flowing into the inside. A smoke detection chamber having light receiving means for receiving the scattered light,
And a warning means for inputting a light receiving signal from the light receiving means and outputting an alarm in accordance with the density of the smoke, wherein the warning means reflects the light emitted by the light emitting means and causes the light receiving means to receive the light. Specimen for performing an operation test of
It is characterized in that it is provided so as to be able to freely move in and out of the main body toward the smoke detection room.

In this configuration, a light receiving signal is input from light receiving means for receiving the light emitted by the light emitting means as scattered light scattered by the smoke flowing into the smoke detection chamber, and an alarm output is issued in accordance with the density of the smoke. The alarm means is operated from the outside of the main body by operating the test object, which reflects the light emitted by the light emitting means and receives the light by the light receiving means, toward the smoke detection room.

It is preferable that the smoke detection chamber has a labyrinth part around the smoke detection part, which also serves as a smoke inflow part, and that the test object moves up and down in the smoke detection chamber. In this case, a test body that reflects irradiation light from the light emitting means and receives the light from the outside of the main body to the light receiving means from the upper or lower side of the smoke detection chamber having a labyrinth part also serving as a smoke inflow part toward the inside thereof. It is operated to leave.

[0010] The smoke detection chamber is elastically supported by the main body, and the test body is located at a position substantially the same as or below the upper or lower surface of the smoke detection chamber with the other end retracted. In addition, it is preferable that one end side is fixed to the main body side so as to protrude into the smoke detection chamber in a state where the test object comes out. In this case, the spring-biased smoke detection chamber which is elastically supported by the main body is pressed, and the other end of the test body having one end fixed to the main body is placed in the smoke detection chamber. In the retracted state of the test body, the position can be substantially the same as or lower than the upper or lower surface of the smoke detection chamber.

[0011] It is also preferable that the test body is a wire material having an operation portion provided at one end of the main body so that when pressed, the other end projects toward the smoke detection chamber. . In this case, the operation can be confirmed by pushing the operating portion of one end of the wire material serving as a test body provided on the main body and projecting the other end side toward the smoke detection chamber side.

[0012]

1 to 3 show a first embodiment of the present invention, which corresponds to all the first to third aspects of the present invention.
Shows a second embodiment corresponding to claim 4.

[First Embodiment] FIG. 1 is an explanatory view showing a smoke detection room which is a main part of a fire alarm according to a first embodiment of the present invention. FIG. 2 is a fire alarm. FIG. 3 is an explanatory diagram showing a schematic configuration of another embodiment of the fire alarm.

The fire alarm 1 of this embodiment has a smoke detecting chamber 2 having a light emitting means and a light receiving means for receiving light scattered by the smoke radiated by the light emitting means and flowing into the inside thereof. And a warning device that receives a light-receiving signal from the light-receiving device and performs a warning output in accordance with the concentration of the smoke. The fire alarm device reflects illumination light 31 from the light-emitting device and causes the light-receiving device to receive light. A test body 7 for performing an operation test of the alarm means is provided so as to be able to freely move in and out of the main body 5 into the smoke detection chamber 2.

Further, in the fire alarm 1 of the embodiment, the smoke detection chamber 2 has a labyrinth portion 21 also serving as a smoke inflow portion around the smoke detection room 2, and the smoke detection room 2 is provided in a vertical direction of the smoke detection room 2. In some cases, the test body 7 is withdrawn. Further, in the fire alarm 1 of the embodiment, the main body 5 elastically supports the smoke detection chamber 2, and the test body 7 is moved to the other end 7b side of the smoke detection chamber 2 with the test body retracted. One end 7a is fixed to the main body 5 so as to protrude into the smoke detection chamber 2 at a position substantially the same as or lower than the upper surface and protruding into the smoke detection chamber 2 in a state where the test object is exposed.

More specifically, the fire alarm 1 is a house alarm installed in a house or the like provided with a smoke detection device for detecting smoke therein and issuing a fire alarm. A main body 5 having alarm means for outputting an alarm according to the smoke concentration.

As shown in FIG. 1A, the smoke detection chamber 2
An infrared LED element 3 corresponding to the light emitting means and a photodiode element 4 corresponding to the light receiving means are provided inside the synthetic resin container. The smoke detection chamber 2 is a substantially cylindrical body having a plurality of labyrinth portions 21 provided with a plurality of substantially rectangular vertical ribs around an upper plate 22 so that smoke flows in and external light does not enter. A lower plate also serving as a decorative cap is provided on the lower surface of the upper plate 22 facing the lower surface, and is formed so that smoke can pass in the direction shown by arrow A in FIG. .

An infrared light L, which will be described later, near the center of the upper plate 22 will be described.
The specimen 7 is located at a position overlapping with the smoke sensing area (S: see FIG. 7) formed by the ED element 3 and the photodiode element 4.
A substantially rectangular through-hole is provided for letting out and from above the smoke detection chamber 2. In this case, as shown in FIG. 1A, the infrared LED element 3 and the photodiode element 4 are arranged at appropriate positions of the labyrinth part 21 so that the smoke sensing area is substantially at the center of the smoke sensing chamber 2. In addition, a test body 7 that reflects irradiation light from the infrared LED element 3 from the outside of the main body 5 to be received by the photodiode element 4 from the outside of the main body 5 described later has a labyrinth part 21 also serving as a smoke inflow part. The smoke detection chamber 2 is supported by a coil spring 8 so as to be able to move up and down so as to be able to move in and out from the upper side of the chamber 2 toward the inside thereof.

The infrared LED element 3, together with a photodiode element 4 to be described later, emits light for forming the above-mentioned smoke sensing area which serves as a smoke detection section of a smoke detection and alarm circuit 6 which senses smoke provided inside the main body 5 and issues a fire alarm. For example, the tip is formed of a shell type infrared LED element functioning as a convex lens. The fire alarm 1 includes an infrared LED element 3 and a photodiode element 4 provided on a circuit board (not shown) provided in the smoke detection chamber 2. An optical axis A3 of the irradiation light 31 of the element 3;
The photodiode elements 4 are arranged so that the optical axis A4 intersects with each other. Then, the light from the infrared LED element 3 is irregularly reflected by the smoke particles flowing into the smoke detection chamber 2,
When the scattered light due to the irregular reflection is received by the photodiode element 4, the presence of smoke particles is detected and the generation of smoke is detected.

The photodiode element 4 is a light receiving means. In this case, as shown in FIG.
Irradiation from the infrared LED element 3 via an incident surface on which the scattered light by the light from the element 3 is incident and a prism 41 which bends the direction of the scattered light by 90 degrees and condenses it on the light receiving surface of the photodiode element 4 The light scattered by the smoke particles of the light 31 is received.

The main body 5 accommodates an alarm means for elastically supporting the smoke detection chamber 2 and for inputting a light receiving signal from the photodiode element 4 and outputting an alarm according to the concentration of the scattered light. A circuit board 52 on which a smoke detection alarm circuit 6 described later is provided and a test piece 7 are formed inside a substantially square synthetic resin case 51 similar to that shown in the description of the technology section. Have been. The smoke detection chamber 2 is penetrated through the through hole of the upper plate 22 so that a test body 7 described later can move out of the upper side of the smoke detection chamber 2, and a plurality of coil springs 8 provided on the lower surface of the circuit board 52. , Is elastically supported through an opening formed substantially at the center of the case 51.

The smoke detection alarm circuit 6 is the same as that shown in FIG.
A smoke detection circuit 61 having a light emitting circuit of the ED element 3 and a light receiving signal amplifying circuit by the photodiode element 4; a signal processing circuit 62 for outputting a warning signal for sounding an alarm device based on an output signal of the light receiving signal amplifying circuit; An alarm circuit 63 having a buzzer 64 serving as an alarm device, an energization indicator light circuit 65 for displaying that the smoke detection alarm circuit 6 is operating,
And a power supply circuit 66 for supplying power to these circuits.

The test body 7 reflects the irradiation light 31 from the infrared LED element 3 to be received by the photodiode element 4, and is made of a synthetic resin plate, a metal plate or the like. This specimen 7
One end 7a side is fixed to a bottom plate which is an upper side of the main body 5,
A plate-shaped reflecting portion 71 at the end on the other end 7b side is made to penetrate the circuit board 52 inside the main body 5 so that the reflecting portion 71 is in a withdrawn state at a position substantially the same as the upper surface of the smoke detection chamber 2. It is arranged in. Therefore, the smoke detection chamber 2 elastically supported by the main body 5 and urged by the spring is pressed, and
The other end 7b side of the test piece can protrude into the smoke detection chamber 2 in a state where the test object comes out.

In the above fire alarm, the infrared LED
Photodiode element 4 for receiving irradiation light from element 3 as scattered light scattered by smoke flowing into smoke detection chamber 2
A buzzer 64 of an alarm means for inputting a light receiving signal from the device and outputting an alarm in accordance with the concentration of smoke flowing into the smoke detection chamber 2
However, an operation test is performed by operating the test body 7 that reflects the irradiation light from the infrared LED element 3 and receives the photodiode element 4 from the outside of the main body 5 toward and into the smoke detection chamber 2.

At this time, the test body 7 disposed on a relatively flat part in the smoke detection chamber 2 for reflecting the irradiation light 31 from the infrared LED element 3 from the outside of the main body 5 and causing the photodiode element 4 to receive the light 31 is The smoke detection chamber 2 having a labyrinth portion 21 also serving as a smoke inflow portion is operated to move in and out from the upper side of the smoke detection chamber 2 toward the inside thereof. The stray light signal resulting from the above is relatively small. Further, the smoke detection chamber 2 elastically supported by the main body 5 and biased by spring is pressed,
The other end 7 of the test body whose one end 7a side is fixed to the main body side
The b side is protruded into the smoke detection chamber 2 with the test piece protruding,
In addition, in the retreat state of the test body, it can be set at a position substantially equal to or lower than the upper or lower surface of the smoke detection chamber, and the operation part for retreating the test body 7 is not noticeable.

Therefore, according to the fire alarm 1 described above, the light receiving signal from the photodiode element 4 which receives the irradiation light 31 from the infrared LED element 3 as scattered light scattered by the smoke flowing into the smoke detection chamber 2 is received. A buzzer 64 which inputs a signal and outputs an alarm according to the smoke density, a test object 7 for reflecting the irradiation light 31 from the infrared LED element 3 and causing the photodiode element 4 to receive the light from the outside of the main body 5 in the smoke detection chamber. Operation test is performed by moving in and out of 2
The operation of the smoke detection circuit can be checked with a simple operation.

A test body 7 for reflecting the irradiation light 31 from the infrared LED element 3 from the outside of the main body 5 and causing the photodiode element 4 to receive the irradiation light 31 has a labyrinth part 2 also serving as a smoke inflow part.
1 is moved from the upper side of the smoke detection chamber 2 having the periphery thereof toward the inside thereof, so that the test body 7 is moved to the smoke detection chamber 2.
The stray light signal resulting from the smoke detection chamber structure can be reduced in the received light signal. Further, the smoke detecting chamber 2 elastically supported by the main body 5 and biased by a spring is provided.
Is pressed, the other end 7b side of the test piece 7 whose one end 7a side is fixed to the main body 5 side is protruded into the smoke detection chamber 2 with the test piece protruded, and the test piece is retracted. Smoke detection room 2
Can be located at substantially the same position as the upper surface of
The operation part for moving back and forth can be formed inconspicuously and is excellent in aesthetic appearance.

In the present invention, in addition to the above-mentioned ones, for example, as shown in FIG. 3 (a), the test piece 7 is supported laterally via a support piece 72 and the one end 7a is operated. A button 73 is provided to be exposed from the main body 5, and as shown in FIG.
It goes without saying that the present invention includes those of various embodiments, such as those that protrude into the smoke detection chamber 2 and come out of the test body.

[Second Embodiment] FIG. 4 is an explanatory diagram showing a schematic configuration of a fire alarm according to a second embodiment.

The fire alarm according to this embodiment is different from the first embodiment only in the configuration of the test body, and the other components are the same as those in the first embodiment. The fire alarm of this embodiment has an operation section 75 provided at the one end 7a side of the main body 2 so that the other end of the test body 7 projects toward the smoke detection chamber 2 when pressed. Wire material is used.

More specifically, the test piece 7 is made of, for example, a flexible metal wire material, and the other end 7b is located above the smoke detection chamber 2 as shown in FIG. It is fixed to the main body 5, and is guided and supported by guide ribs 53 inside the main body 5 so that one end 7 a of the operation section 75 on which the operation button is provided is exposed from the main body 5. This specimen 7
As shown in FIG. 4B, when the operation button serving as the operation unit 75 is pressed, the other end 7b side serving as the reflection unit 74 by the pressed size becomes the smoke sensing area (S: FIG. 7
) And the specimen comes out.

Therefore, according to the fire alarm 1 described above, the operating portion 75 at one end of the wire material which is the test piece 7 disposed on the main body 5 is pushed, and the other end 7b side is set to the smoke detection chamber 2 side. , The operation can be checked, and the test body 7 can be moved in and out of the smoke detection chamber 2 with a relatively simple configuration provided with a wire material.

In the test piece 7 of the present invention, in addition to the above-mentioned metal wire, a flexible wire is disposed inside a tubular outer tube, and is provided at one end of the wire. It goes without saying that the present invention includes various embodiments, such as a configuration in which the operated operation unit is pressed and the other end of the wire is directly exposed to the smoke detection area in the smoke detection chamber 2.

[0034]

The present invention is embodied as in the above embodiment. In the fire alarm according to the first aspect, the light emitted by the light emitting means is scattered by the smoke flowing into the smoke detection chamber. Warning means for inputting a light receiving signal from light receiving means for receiving as scattered light and performing an alarm output in accordance with the concentration of the smoke,
From the outside of the main body, the test object that reflects the irradiation light from the light emitting means and receives it by the light receiving means is directed toward the smoke detection room and operated and tested, so the operation of the smoke detection circuit can be checked with simple operation. can do.

In the fire alarm according to the second aspect, the test body that reflects the light emitted from the light emitting means from the outside of the main body and causes the light receiving means to receive the light includes a labyrinth part also serving as a smoke inflow part. The test specimen can be placed in a relatively flat area in the smoke detection chamber because the smoke detection chamber is operated from the upper or lower side toward the inside of the smoke detection chamber. The stray light signal resulting from the above can be reduced.

Further, in the fire alarm according to the third aspect of the present invention, the smoke detection chamber elastically supported by the main body and pressed by the spring is pressed, and one end of the smoke detection chamber is fixed to the main body. The other end is protruded into the smoke detection chamber with the test object exposed,
In addition, since the test piece can be set at a position substantially the same as or lower than the upper or lower surface of the smoke detection chamber in the retracted state of the test piece, the operation part for retracting the test specimen can be formed inconspicuously, and the appearance is excellent.

Further, in the fire alarm according to the fourth aspect, the operating part of one end of the wire material serving as a test body provided on the main body is pushed, and the other end is directed toward the smoke detection chamber. Since the operation can be confirmed by protruding the test object, the test object can be moved in and out of the smoke detection chamber with a relatively simple configuration provided with a wire material.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a smoke detection room, which is a main part of a fire alarm according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a schematic configuration of the fire alarm.

FIG. 3 is an explanatory diagram showing a schematic configuration of another embodiment of the fire alarm.

FIG. 4 is an explanatory diagram illustrating a schematic configuration of a fire alarm according to a second embodiment.

FIG. 5 is a block diagram showing an example of a smoke detection alarm circuit of the fire alarm.

FIG. 6 is an external view showing a fire alarm according to a conventional example of the present invention.

FIG. 7 is an explanatory diagram showing a schematic configuration of a smoke detection room of the fire alarm.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fire alarm 2 Smoke detection room 21 Labyrinth part 3 Infrared LED element (light emitting means) 31 Irradiation light 4 Photodiode element (light receiving means) 5 Main body 64 Buzzer (alarm means) 7 Specimen 7a One end 7b Other end

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tomohiro Yoshitsuru 1048 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd. F-term (reference) 5C085 AA03 AB01 AC07 BA33 CA12 DA07 DA08 FA24 5C087 AA02 AA03 CC02 CC27 DD04 EE08 FF04 FF13 GG57

Claims (4)

[Claims] 1. A smoke detection chamber having a light emitting means, a light receiving means for receiving scattered light scattered by smoke radiated by the light emitting means and flowing into the interior thereof, and a light receiving signal is inputted from the light receiving means. A fire alarm device having an alarm means for outputting an alarm in accordance with the concentration of the smoke, wherein a test body for reflecting the light emitted by the light emitting means and causing the light receiving means to receive the light to perform an operation test of the alarm means. A fire alarm which is provided so as to be able to be moved out and in from the outside of the main body toward the smoke detection room. 2. The fire alarm according to claim 1, wherein the smoke detection room has a labyrinth portion also serving as a smoke inflow portion around the smoke detection room, and the test body moves up and down in the vertical direction of the smoke detection room. 3. A position where the main body elastically supports the smoke detection chamber, and the test body is substantially the same as or lower than the upper or lower surface of the smoke detection chamber with the other end retracted. 3. The fire alarm according to claim 2, wherein one end of the fire alarm is fixed to the main body so as to protrude into the smoke detection chamber in a state where the test object comes out. 4. A wire member having an operation portion provided at one end of the main body such that, when pushed, the other end projects toward the smoke detection chamber when pressed. The described fire alarm.