JP6900281B2 - Smoke detector - Google Patents

Description

The present invention relates to a smoke detection device that detects smoke introduced into a smoke introduction portion surrounded by a labyrinth, such as a smoke detector and a smoke type alarm.

The smoke detection device is attached to a wall surface or a ceiling surface, and has a structure in which smoke is introduced into a smoke introduction portion in the event of a fire. For this reason, there is a problem that dust or the like accumulates on the labyrinth or the like in the smoke introduction portion with the lapse of the installation period, and the smoke detection ability is lowered.
It is possible to remove the smoke detection device from the ceiling surface and clean the labyrinth, etc., but it takes time and effort. Therefore, Patent Document 1 proposes a residential fire alarm that can be easily cleaned by a vacuum cleaner for a house or the like while being mounted on a wall surface or a ceiling.

The residential fire alarm disclosed in Patent Document 1 is a residential fire alarm in which a detection unit configured by arranging a smoke detection element in a smoke detection room surrounded by a labyrinth wall is provided in the head portion. In addition to forming an intake hole in the main body cover constituting the unit, a ventilation hole is formed inside the detection unit to provide a ventilation path communicating from the outside of the residential fire alarm to the smoke detection chamber. (See claim 1).

Then, according to the above-mentioned residential fire alarm, the air is sucked by simply covering the detection unit with the intake pipe of a cleaning device such as a residential vacuum cleaner while it is still attached to the wall surface or ceiling surface. The air flow that flows into the smoke detection chamber from the outside of the alarm device and is discharged from the smoke detection chamber is formed through the ventilation passage formed by the holes, ventilation holes, etc., and the smoke is detected by the air flow. It is said that dust accumulated on the labyrinth wall, insect net, protective cover, etc. of the room can be efficiently removed.

Japanese Unexamined Patent Publication No. 2010-33238

In the residential fire alarm disclosed in Patent Document 1, since the intake pipe of the cleaning device is covered over the entire detection unit to suck air, the air flow flows into the smoke detection chamber from the outside of the alarm device, and further smoke detection. It will be discharged from the room through the insect net.
Therefore, it is considered that dust and the like adhering to the outer surface of the insect screen can be effectively removed without entering the smoke detection chamber.
However, according to the inventor's knowledge, false positives caused by light scattering by fine particles that have entered the smoke sensing chamber are more falsely detected than false positives caused by obstruction of smoke inflow due to dust adhering to the outside of the insect screen. It is known to be overwhelmingly large.
Therefore, in the airflow flow as in Patent Document 1, since the airflow flows through the insect net, the airflow is slowed down, and the airflow flows from the inside to the outside of the insect net, so that the smoke detection chamber (insect repellent) is used. There is a problem that dust and the like composed of fine particles (inside the net) cannot be effectively removed.

The present invention has been made to solve such a problem, and provides a smoke detection device capable of easily and effectively removing dust and the like existing in a smoke introduction part and a smoke detection part that cause false detection. It is an object.

(1) The smoke detection device according to the present invention has a smoke introduction unit for introducing smoke, a light emitting element, and a light receiving element for receiving scattered light of the light emitting element, and detects smoke introduced from the smoke introduction unit. It is a smoke detector equipped with a smoke part,
It is characterized by including a communication hole formed so as to communicate with the inside of the smoke introduction portion, and a removable plug member for closing the communication hole.

(2) Further, in the above-described item (1), the smoke detection unit is provided above the smoke introduction unit so that light does not enter the smoke detection unit with the plug member removed. It is characterized by being done.

(3) Further, in the one described in (2) above, the communication hole is formed in the center of the bottom surface of the smoke introduction portion, and the inner surface of the plug member inspects the smoke introduced into the smoke introduction portion upward. It is characterized by having a function as a smoke guiding unit that guides the smoke unit.

(4) Further, in any one of the above (1) to (3), the plug member is characterized in that it is formed of silicon rubber to which dust adheres.

In the smoke detection device of the present invention, a smoke introduction unit for introducing smoke, a light emitting element, and a smoke detection unit having a light receiving element for receiving scattered light of the light emitting element and detecting smoke introduced from the smoke introduction unit. The smoke introduction portion is provided with a communication hole formed so as to communicate with the inside of the smoke introduction portion, and a removable plug member for closing the communication hole, which causes a false detection. Dust and the like existing in the smoke introduction part and the smoke detection part can be easily and effectively removed.

It is a perspective view of the smoke detection apparatus which concerns on Embodiment 1 of this invention. It is an exploded perspective view of the smoke detection device shown in FIG. It is sectional drawing of the smoke detection apparatus shown in FIG. It is explanatory drawing explaining the state at the time of cleaning of the smoke detection apparatus shown in FIG. It is a perspective view of the smoke detection device which concerns on Embodiment 2 of this invention. It is an exploded perspective view of the smoke detection device shown in FIG. It is sectional drawing of the smoke detection apparatus shown in FIG. It is the disassembled state of the smoke introduction part in the smoke detection apparatus shown in FIG. It is explanatory drawing of the smoke detection part in the smoke detection apparatus shown in FIG. It is explanatory drawing explaining the state at the time of cleaning of the smoke detection apparatus shown in FIG.

[Embodiment 1]
In the smoke detection device 1 according to the present embodiment, the smoke introduction unit 7 for introducing smoke and the smoke detection unit 9 for detecting the introduced smoke are located at the same height in the horizontal direction, and FIG. -As shown in FIG. 3, a smoke introduction unit 7 that introduces smoke into a housing composed of an outer cover 3 and a back cover 5, a smoke detection unit 9 that detects smoke introduced from the smoke introduction unit 7, and a smoke introduction unit. A communication hole 11 formed so as to communicate with the inside of the portion 7 and a removable plug member 13 for closing the communication hole 11 are provided.
Hereinafter, each configuration will be described in detail.
The direction of the smoke detection device 1 shown in FIG. 1 is the same as that of the smoke detection device 1 mounted on the ceiling surface, and in the present specification, "upper" means "upper" when the smoke detection device 1 is installed on the ceiling surface. The side (ceiling surface side) is referred to, and "lower" means the "lower" side (lower side of the ceiling surface).

<Outer cover>
The outer cover 3 includes a flat cylindrical main body portion 15 having an open upper portion and a bottomed cylindrical main body portion 17 having a diameter smaller than that of the main body portion 15 protruding downward at the center of the main body portion 15. A confirmation light 19 is provided on the outer peripheral surface of the main body 15.
A rectangular window portion 21 for allowing smoke to flow in is formed on the peripheral wall of the protruding portion 17. Further, as shown in FIG. 2, a first opening 23 forming the communication hole 11 is provided on the bottom surface of the protruding portion 17. As shown in FIG. 2, the peripheral edge of the first opening 23 has an enlarged lower portion to form the first step portion 25.

<Back cover>
As shown in FIGS. 2 and 3, the back cover 5 is formed of a disk-shaped plate-like body and covers the upper opening of the outer cover 3.
A printed circuit board 27 on which the smoke detection unit 9 is mounted is attached to the inner surface side of the back cover 5.

<Smoke introduction section>
The smoke introduction unit 7 introduces the smoke flowing in from the window unit 21 into the smoke detection unit 9, and as shown in FIG. 2, the bottomed cylindrical body 29 having an open peripheral surface and the inside of the cylindrical body 29. The labyrinth wall 31 to be inserted and the insect net 33 arranged so as to cover the opening of the cylindrical body 29 are provided.
A second opening 35 forming the communication hole 11 is formed at the bottom of the cylindrical body 29. The outer peripheral edge of the second opening 35 on the inner surface side has an enlarged upper diameter to form a second step portion 37 (see FIG. 4).
In the assembled state, the second opening 35 of the cylindrical body 29 and the first opening 23 of the outer cover 3 communicate with each other with the same diameter to form a communication hole 11 (see FIG. 4). The first step portion 25 has a larger diameter than the second step portion 37. This is because if the diameter of the second step portion 37 is larger than that of the first step portion 25, the plug member 13 described later cannot be inserted, and if the first step portion 25 and the second step portion 37 have the same diameter. This is because if the center is deviated due to a manufacturing error, it becomes difficult to insert the plug member 13.

<Smoke detection section>
The smoke detection unit 9 is a portion that detects smoke introduced from the smoke introduction unit 7 into the smoke detection space in the labyrinth wall 31, and includes a light emitting element 39 and a light receiving element 41 that receives scattered light from the smoke. There is.
The printed circuit board 27 is attached to the upper surface side of the smoke detection unit 9 and is equipped with electrical components. The upper surface side of the printed circuit board 27 is covered with the back cover 5.

<Plug member>
It closes the communication hole 11 formed by communicating the first opening 23 and the second opening 35, and is formed of, for example, flexible silicon rubber.
As shown in FIG. 4, the plug member 13 has a shape having flange portions 43a and b at the top and bottom. Each flange portion 43 is formed to match the diameters of the first step portion 25 and the second step portion 37, and the flange portion 43b below the upper flange portion 43a has a larger diameter. The upper and lower flange portions 43a and 43b are arranged in the second stage portion 37 and the first stage portion 25, respectively, to prevent light and dust from entering the smoke introduction portion 7.
By forming the plug member 13 with a flexible member such as silicon rubber, the plug member 13 can be easily removed and attached simply by deforming the plug member 13.
Further, in the case of silicon rubber, dust is likely to adhere, so that false detection can be prevented by preventing the dust from floating in the smoke detection unit 9 by forming the stopper member 13 with silicon rubber.
However, the material and mounting method of the plug member 13 are not particularly limited. For example, the material may be resin and the mounting method may be a screw-in type.

In the smoke detection device 1 configured as described above, when the smoke detection device 1 is installed on the ceiling surface or the like and cleaning is required after a predetermined period of time has passed, the smoke detection device 1 is attached to the ceiling surface or the like. , As shown in FIG. 4, the stopper member 13 is removed, and suction is performed so as to cover the first opening 23 with the tip opening of the suction nozzle 44 of a vacuum cleaner or the like.
As shown by the thick solid arrow in FIG. 4, the suction causes a flow of airflow discharged from the communication hole 11 from the outside to the inside of the smoke detection unit 9, and the labyrinth wall 31 and the like in the smoke detection unit 9 and the like are generated. Dust adhering to the can be reliably removed.
When the suction is completed, the plug member 13 is attached and the cleaning is completed.

As described above, according to the smoke detection device 1 of the present embodiment, a flow of airflow from the outside to the inside of the smoke detection unit 9 is created, and suction is performed from the communication hole 11 that directly communicates with the inside of the smoke detection unit 9. Therefore, it is possible to reliably remove dust and the like inside the smoke detection unit 9 that causes erroneous detection.

[Embodiment 2]
In the smoke detection device 1 of the first embodiment, the smoke introduction unit 7 and the smoke detection unit 9 are present at the same height position in the horizontal direction, but the smoke detection device 45 according to the present embodiment has a lower portion. There is a smoke introduction unit 47 that introduces smoke into the smoke introduction unit 47, and a smoke detection unit 49 is located above the smoke introduction unit 47, which is a so-called two-stage type (see FIG. 7). The same parts as those in the first embodiment and the corresponding parts are designated by the same reference numerals, and the description thereof will be omitted.
As shown in FIGS. 5 to 10, the smoke detection device 45 of the present embodiment has a smoke introduction unit 47 for introducing smoke into a housing including an outer cover 3 and a back cover 5, and a smoke introduction unit 47 above the smoke introduction unit 47. A smoke detection unit 49 that detects smoke introduced in the smoke introduction unit 47, a communication hole 11 formed in a protrusion 17 so as to communicate with the inside of the smoke introduction unit 47, and a removable plug that closes the communication hole 11. It includes a member 51.

<Outer cover>
The shape of the outer cover 3 is almost the same as that of the first embodiment, but the first opening 23 provided on the bottom surface of the protruding portion 17 is larger than that of the first embodiment. This is because the plug member 51 attached to the first opening 23 has a function as a smoke guiding unit that guides the introduced smoke to the smoke detecting unit 49, as will be described later. Therefore, when the plug member 51 does not have such a function, the size of the first opening 23 may be as small as in the first embodiment.

<Smoke introduction section>
The smoke introduction unit 47 introduces the smoke flowing in from the window unit 21 into the smoke detection unit 49, and as shown in FIG. 6, the bottomed cylindrical body 53 having an open peripheral surface and the inside of the cylindrical body 53. It is configured to include a flow path forming member 55 to be inserted.
A second opening 35 forming the communication hole 11 is formed at the bottom of the cylindrical body 53. The second opening 35 has a larger diameter than that of the first embodiment, like the first opening 23 formed in the protruding portion 17 of the outer cover 3.

The flow path forming member 55 has a substantially donut-shaped shape, the outer peripheral side thereof is a first inclined surface 57 inclined inward and downward, and the inner peripheral side is inclined upward toward the center. It is a second inclined surface 59. A large number of slits 63 are formed on the first inclined surface 57 and the second inclined surface 59 by arranging a large number of plate-shaped bodies 61 in the circumferential direction at predetermined intervals.

The flow path forming member 55 makes the smoke flow path zigzag, as shown by the thick dashed arrow in FIG. As a result, smoke can pass through by utilizing the difference in mass between smoke and substances other than smoke such as steam, but steam and the like are captured by the plate-shaped body 61, which is based on steam and the like. False positives are prevented.

In addition, by providing a large number of plate-shaped bodies 61 and making the smoke flow path zigzag, the smoke introduction portion 47 also has a function as a stray light portion that makes it difficult for external light to enter due to repeated reflection and attenuation. ing.
Therefore, even when the plug member 51 is removed, it is difficult for light to enter the smoke detection unit 49. As will be described later, when the plug member 51 is removed and cleaned, the receiver is not turned off. , It is possible to clean while maintaining the detection state by other smoke detectors.
The flow path forming member 55 is preferably formed of a black member in order to attenuate external light.

<Smoke detection section>
As shown in FIG. 9, the smoke detection unit 49 has a cylindrical portion in which a light trap 65 is formed on the inner peripheral wall, the inside of the cylindrical portion serves as a smoke detection space, and the smoke detection space includes a light emitting element 39. A light receiving element 41 that receives the scattered light due to smoke is provided.
A printed circuit board 27 on which electrical components are mounted is provided on the upper surface side of the smoke detection unit 49, and the upper surface side of the printed circuit board 27 is covered with a back cover 5.

<Plug member>
The material of the stopper member 51 is the same as that of the first embodiment, but the shape thereof is different. As shown in FIGS. 7 to 9, the plug member 51 of the present embodiment has a conical surface portion 67 on the upper surface, and the conical surface portion 67 extends inside the smoke introduction portion 47 to form a flow path member. It functions as a smoke guiding unit that forms a smoke flow path in cooperation with 55 and guides the smoke introduced into the smoke introducing unit 47 to the smoke detecting unit 49.

Since the plug member 51 of the present embodiment has a function as a smoke guiding portion, the area of the upper surface thereof is large. Therefore, it is more preferable to form the plug member 51 with a material such as silicon rubber to which dust or the like easily adheres so that the dust or the like adheres to the stopper member 51.
Since the stopper member 51 is easy to remove, it can be easily cleaned.

In the smoke detection device 45 configured as described above, the smoke passes through the smoke introduction unit 47 and reaches the smoke detection unit 49 (see FIG. 7). Therefore, steam, dust, and the like are captured by the smoke introduction unit 47 before reaching the smoke detection unit 49, and erroneous detection is prevented. However, it is necessary to remove the dust and the like captured by the smoke introduction unit 47. In this case, as shown in FIG. 10, the stopper member 51 is removed and a vacuum cleaner or the like is used, as in the first embodiment. Suction is performed so as to cover the communication hole 11 with the tip port of the suction nozzle 44. As a result, the flow of the airflow discharged from the communication hole 11 from the outside to the inside of the smoke detection unit 49 is generated, and the dust adhering to the flow path forming member 55 or the like in the smoke detection unit 49 is surely removed. be able to.

Further, as described above, in the present embodiment, since the smoke detection unit 49 is above the smoke introduction unit 47 (because of the two-stage type), light is emitted to the smoke detection unit 49 even when the plug member 51 is removed. When cleaning by removing the plug member 51 without incident, it is possible to perform cleaning while maintaining the fire monitoring state of other smoke detectors without turning off the receiver.
Although the smoke introduction section 47 has been described here as being provided with the flow path forming member 55, the smoke introduction section provided with the labyrinth wall body as in the first embodiment and the inspection provided above the smoke introduction section. The same effect can be obtained even with a two-stage smoke detection device including a smoke unit 49.

1 Smoke detection device (Embodiment 1)
3 Outer cover 5 Back cover 7 Smoke introduction part 9 Smoke detection part 11 Communication hole 13 Plug member 15 Main body part 17 Protruding part 19 Confirmation light 21 Window part 23 1st opening 25 1st stage 27 Printed board 29 Cylindrical body 31 Labyrinth Wall 33 Insect repellent net 35 Second opening 37 Second stage 39 Light emitting element 41 Light receiving element 43a, b Flange 44 Smoke nozzle 45 Smoke detection device (Embodiment 2)
47 Smoke introduction part 49 Smoke detection part 51 Plug member 53 Cylindrical body 55 Flow path forming member 57 First inclined surface 59 Second inclined surface 61 Plate-shaped body 63 Slit 65 Light trap 67 Conical surface

Claims (3)

A smoke introduction unit for introducing smoke, a light emitting element, and a light receiving element for receiving scattered light of the light emitting element are provided in a housing composed of an outer cover and a back cover, and smoke detection for detecting smoke introduced from the smoke introduction unit is provided. It is a smoke detector equipped with a part,
A communication hole formed by a first opening formed in the outer cover so as to communicate with the inside of the housing and a second opening formed so as to communicate with the inside of the smoke introduction portion, and the communication. A smoke detection device including a removable plug member that closes a hole. The smoke detection unit is provided above the smoke introduction unit, and is provided.
The communication hole is formed in the center of the bottom surface of the smoke introduction portion, and the upper surface is provided with a conical surface portion so that the inner surface of the plug member guides the smoke introduced into the smoke introduction portion to the upper smoke detection portion. The smoke detection device according to claim 1, wherein the smoke detection device has a function as a unit. The smoke detection unit is provided above the smoke introduction unit, and is provided.
The communication hole is formed in the center of the bottom surface of the smoke introduction portion.
The smoke introduction portion includes a bottomed cylinder having an open peripheral surface and a flow path forming member inserted into the cylinder.
The plug member forms a smoke flow path in cooperation with the flow path forming member, and functions as a smoke guidance unit that guides smoke introduced into the smoke introduction unit to the smoke detection unit. Item 1. The smoke detection device according to item 1.

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