JP7023058B2 - smoke detector - Google Patents

Description

The present invention relates to a smoke detector, and more particularly to a smoke detector provided with a smoke detector for detecting smoke.

A conventional smoke detector has been proposed to include a housing in which an opening through which smoke flows is formed on the side surface, and a smoke detection unit housed in the housing (for example, a patent). See Document 1). The smoke detection unit of the smoke detector described in Patent Document 1 is provided at a position deviated from the center of the housing in the radial direction of the housing.

Japanese Patent No. 5124327 (eg, paragraph 0061 and FIG. 6).

Since the smoke detection part of the conventional smoke detector is provided at a position shifted in the radial direction of the housing from the center of the housing, the distance between the inner peripheral surface of the side surface of the housing and the smoke detection part is the smoke detection part. It varies in the circumferential direction of the part. Therefore, there is a problem that the smoke inflow characteristics in the circumferential direction of the housing vary, and the smoke detection accuracy in the circumferential direction of the housing varies.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a smoke detector capable of suppressing variations in smoke detection accuracy in the circumferential direction of a housing. ..

The smoke detector according to the present invention includes a housing installed on the ceiling including a tubular side surface extending downward, and is housed in the housing in the radial direction of the housing from the center of the housing. The smoke detection unit provided at a displaced position and the space contained in the housing are divided into a first space and a second space provided above the first space. And the optical table housed in the housing and formed in the partition member and provided with the smoke detection unit, and the optical table cover housed in the housing and provided in the optical table. The side surface portion has a second region in which the distance from the smoke detection unit is within the first range and the distance between the smoke detection unit is larger than the upper limit of the first range. In the first region, a first opening is formed in the circumferential direction, and in the second region, the opening area is the first opening. A second opening wider than the opening area of the above is formed, and the first space is a space through which smoke flows through the first opening and the second opening, and the section. The member is formed with an inclined surface extending from the smoke detection portion side to the upper side of the second opening in the second region, and the smoke detection portion includes a light emitting portion and the light emitting portion. The first space includes a light receiving unit for receiving light, a smoke detection cover for accommodating the light emitting unit and the light receiving unit, and a labyrinth wall provided on the optical table and housed in the optical table cover. Is provided with the optical table cover and the labyrinth wall, the second space is provided with the light emitting portion, the light receiving portion and the smoke detection cover, and the inclined surface formed on the partition member is provided. The second region extends upward from the optical table side with respect to the second opening.

Since the smoke detector according to the present invention has the above configuration, it is possible to suppress variations in smoke detection accuracy in the circumferential direction of the housing.

It is a side view which shows the appearance of the smoke detector which concerns on embodiment of this invention. It is a bottom view which shows the appearance of the smoke detector which concerns on embodiment of this invention. It is a vertical sectional view of the smoke detector which concerns on embodiment of this invention. FIG. 3 is a cross-sectional view taken along the line AA shown in FIG. FIG. 3 is a cross-sectional view taken along the line BB shown in FIG. (A) is an explanatory diagram of a modified example 1 of a smoke detector according to an embodiment of the present invention, and (b) is an explanatory diagram of a modified example 2 of a smoke detector according to an embodiment of the present invention.

Embodiment.
Hereinafter, embodiments of the smoke detector according to the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below. Further, in the following drawings including FIG. 1, the relationship between the sizes of the constituent members may differ from the actual one.

FIG. 1 is a side view showing the appearance of the smoke detector 100 according to the embodiment. FIG. 2 is a bottom view showing the appearance of the smoke detector 100 according to the embodiment. FIG. 3 is a vertical sectional view of the smoke detector 100 according to the embodiment. FIG. 4 is a sectional view taken along the line AA shown in FIG. The cross section of FIG. 3 is a CC cross section shown in FIG.

The smoke detector 100 is installed in a monitoring space such as the interior of a house. As shown in FIG. 1, the smoke detector 100 is mounted, for example, on the ceiling 200. As shown in FIGS. 1 to 4, the smoke detector 100 includes a housing 10 including a cylindrical side surface portion 11B. Further, as shown in FIG. 4, the smoke detector 100 is housed in the housing 10 and includes a smoke detection unit 5 provided at a position displaced in the radial direction from the center O1 of the housing 10. ing. The smoke detection unit 5 has a function of detecting smoke. Further, as shown in FIGS. 3 and 4, the smoke detector 100 is housed in the housing 10, and the partition member 3 for partitioning the space inside the housing 10 into the first space SP1 and the second space SP2. And an optical base cover 4 provided on the partition member 3. Further, as shown in FIGS. 3 and 4, the smoke detector 100 includes a substrate 6 provided on the partition member 3 to control the smoke detection unit 5 and a battery 7 for supplying the operating power of the smoke detection unit 5. I have. In FIG. 4, since the substrate 6 is hidden by the partition member 3, the substrate 6 is schematically shown by a dotted line.

As shown in FIGS. 1 to 4, the housing 10 has a bottomed tubular first cover 11 on which a first opening 1 and a second opening 2 are formed, and a first cover 11. A second cover 12 is provided on the upper part of the cover and serves as a lid for the first cover 11. The first cover 11 includes a flat plate-shaped lower surface portion 11A on which the speaker hole 11A1 is formed, a cylindrical side surface portion 11B, and an annular corner portion 11C connecting the lower surface portion 11A and the side surface portion 11B. ing. The lower surface portion 11A faces the partition member 3. The side surface portion 11B is within a second range in which the distance between the first region Rg1 in which the distance from the smoke detection unit 5 is within the first range and the smoke detection unit 5 is larger than the upper limit of the first range. Includes a second region Rg2. Further, as described below, the first region Rg1 and the second region Rg2 can be defined by the first opening 1 and the second opening 2.

In the embodiment, the first region Rg1 and the second region Rg2 are divided by a vertical surface L1 that divides the housing 10 into two equal parts. That is, as shown in FIG. 2, the first region Rg1 is provided in the angle range θ1 of the center O1, and the second region Rg2 is provided in the angle range θ2 of the center O1. The angle range θ1 and the angle range θ2 are 180 degrees. A first opening 1 is formed in the first region Rg1. The first opening 1 has an opening 1A extending in the circumferential direction of the side surface portion 11B of the housing 10 and an opening 1B extending parallel to the opening 1A. A second opening 2 is formed in the second region Rg2. The second opening 2 has an opening 2A extending in the circumferential direction of the side surface portion 11B of the housing 10, an opening 2B extending parallel to the opening 2A, and an opening 2C extending parallel to the opening 2A. .. In the embodiment, the opening 1A, the opening 1B, the opening 2A, the opening 2B and the opening 2C have the same shape. As described above, since the second opening 2 has a larger number of openings having the same shape arranged in the vertical direction than the first opening 1, the opening area of the second opening 2 is the first. It becomes wider than the opening area of the opening 1 of. Further, the height width of the second opening 2 is wider than the height width of the first opening 1. That is, the width between the upper edge portion Ed3 and the lower edge portion Ed4 of the second opening 2 is wider than the width between the upper edge portion Ed1 and the lower edge portion Ed2 of the first opening 1. .. Therefore, the opening area of the second opening 2 is wider than the opening area of the first opening 1.

As shown in FIG. 4, the distance between the inner peripheral surface of the side surface portion 11B of the housing 10 and the smoke detecting portion 5 differs depending on the position of the smoke detecting portion 5 in the circumferential direction. Here, the distance between the inner peripheral surface of the side surface portion 11B of the housing 10 and the smoke detecting portion 5 is defined. It is assumed that the distance between the inner peripheral surface of the side surface portion 11B of the housing 10 and the smoke detection unit 5 is a radial distance from the center O2 of the smoke detection unit 5. The distance Ds1 indicates the shortest distance among the distances between the inner peripheral surface of the side surface portion 11B of the housing 10 and the smoke detection portion 5. Further, the distance Ds2 indicates the distance between the boundary portion between the first region Rg1 and the second region Rg2 and the smoke detection unit 5. Further, the distance Ds3 indicates the longest distance among the distances between the inner peripheral surface of the side surface portion 11B of the housing 10 and the smoke detection portion 5. The first range of the first region Rg1 described above is a range of a distance Ds1 or more and a distance Ds2 or less. Further, the second range of the second region Rg2 is longer than the distance Ds2 and is a range of the distance Ds3 or less.

The smoke detection unit 5 includes a smoke detection cover 5a provided on the partition member 3, a partition wall 5C provided inside the smoke detection cover 5a, and a smoke inflow space 5D into which smoke flows in when a fire or the like occurs. And have. Further, the smoke detection unit 5 is provided on the optical table 3C, which will be described later, and has a labyrinth wall Lb having a light-shielding function. The smoke inflow space 5D is formed inside the partition wall 5C. The labyrinth wall Lb has a first wall body Lb1 in which a first passage pt1 for passing smoke is formed, and a second passage pt2 which is wider than the first passage pt1 and allows smoke to pass through. The second wall body Lb2 and the like are included. The first wall body Lb1 includes a plurality of wall bodies, and a first passage pt1 is formed between adjacent wall bodies. Further, the second wall body Lb2 also includes a plurality of wall bodies, and a second passage pt2 is formed between the adjacent wall bodies.

The wall body included in the first wall body Lb1 is bent, but the wall body included in the second wall body Lb2 is linear. Therefore, smoke is more likely to flow in the second wall body Lb2 than in the first wall body Lb1. Further, the distribution of the wall body included in the first wall body Lb1 is denser than the distribution of the wall body included in the second wall body Lb2. Therefore, smoke is more likely to flow in the second wall body Lb2 than in the first wall body Lb1.

The first wall body Lb1 is provided on the first region Rg1 side, and the second wall body Lb2 is provided on the second region Rg2 side. Further, the smoke detection unit 5 includes a light emitting unit 5A that can be configured by, for example, an LED or the like, and a light receiving unit 5B that receives the light of the light emitting unit 5A (see FIG. 5).

The partition member 3 includes an inclined surface 3A that inclines downward from the second opening 2 side toward the smoke detection unit 5, a concave battery accommodating portion 3B that accommodates the battery 7, an optical table cover 4, and an optical table cover 4. It is equipped with an optical table 3C on which a labyrinth wall Lb is placed. The inclined surface 3A extends from the optical table 3C side to the upper side of the second opening 2 in the second region Rg2. The inclined surface 3A is formed radially with the smoke detecting portion 5 as the center in the direction toward the side surface portion 11B. That is, the inclined surface 3A is formed in a hem shape when the smoke detection portion 5 is the top. The optical table 3C is formed, for example, in a concave shape so that the labyrinth wall Lb can be easily placed. The optical table 3C is formed with a through hole Op that communicates the space inside the optical table cover 4 and the space inside the smoke detection cover 5a. The through hole Op is formed in the central portion of the optical table 3C.
The optical table cover 4 is a bowl-shaped member. The side surface portion of the optical table cover 4 has a cylindrical shape. The optical table cover 4 is formed with a plurality of holes through which smoke passes. The optical table cover 4 accommodates the labyrinth wall Lb.

The optical table cover 4 and the labyrinth wall Lb are provided in the first space SP1. Further, the second space SP2 is provided with a smoke detection cover 5a, a light emitting unit 5A, a light receiving unit 5B, a partition wall 5C, a smoke inflow space 5D, a substrate 6, a battery 7, and the like.

FIG. 5 is a cross-sectional view taken along the line BB shown in FIG. The light emitting unit 5A and the light receiving unit 5B are provided between the smoke detection cover 5a and the partition wall 5C. Holes are formed in the partition wall 5C at a position facing the light emitting portion 5A and a position facing the light receiving portion 5B, respectively. The battery 7 is a long columnar member. The central axis of the battery 7 is provided on a straight line L2 that is orthogonal to the straight line L10 in the vertical plane L1 (see FIG. 1) and passes through the center O2. The central axis of the battery 7 may be provided on a straight line L3 that intersects the straight line L10 and passes through the center O2. By providing the central axis of the battery 7 on a straight line passing through the center O2 such as the straight line L2 or the straight line L3, it is possible to realize an arrangement that minimizes the obstruction of smoke inflow to the smoke detection unit 5 by the battery 7.

Next, the operation of the smoke detector 100 will be described with reference to FIGS. 1 to 5. When a fire or the like occurs, smoke flows into the first space SP1 of the housing 10 through the first opening 1 and the second opening 2. The smoke that has flowed into the first space SP1 flows into the space inside the optical table cover 4 through the hole of the optical table cover 4. The smoke that has flowed into the space inside the optical table cover 4 passes through the first passage pt1 and the second passage pt2 of the labyrinth wall Lb, and then flows into the through hole Op of the optical table 3C of the partition member 3. The smoke that has flowed into the through hole Op flows into the smoke inflow space 5D in the partition wall 5C of the smoke detection unit 5. Fine particles are mixed in the smoke. Since these particles are heavier than smoke, they are difficult to rise. Therefore, the particles stay on the optical table cover 4, and the smoke flows into the smoke inflow space 5D. As a result, the smoke detector 100 has improved fire detection accuracy. When smoke flows into the smoke inflow space 5D, the light emitted from the light emitting unit 5A is scattered. The smoke detector 100 detects a fire when the light receiving unit 5B detects the scattered light.

Next, the effect of the embodiment will be described. The smoke detection unit 5 is provided at a position deviated from the center O1 of the housing 10 in the radial direction of the housing 10 (on the side of the first region Rg1). Therefore, the distance between the first region Rg1 and the smoke detection unit 5 is smaller than the distance between the second region Rg2 and the smoke detection unit 5. As a result, the smoke inflow characteristics in the circumferential direction of the housing 10 of the smoke detector 100 vary. That is, the smoke inflow characteristic of the angle range θ2 corresponding to the second region Rg2 is more likely to be deteriorated than the smoke inflow characteristic of the angle range θ1 corresponding to the first region Rg1.
Further, it is considered that the air flowing into the housing 10 from the first region Rg1 escapes from the second region Rg2 arranged on the opposite side of the first region Rg1. Here, when air (including smoke) flows into the housing 10 from the first region Rg1, the air inside the housing 10 is difficult to escape to the outside of the housing 10 due to the presence of the smoke detection unit 5. This is because the smoke detection unit 5 is provided at a position deviated from the center O1 of the housing 10 in the radial direction of the housing 10, so that the ventilation resistance in the housing 10 increases at the position of the smoke detection unit 5. be. If the air inside the housing 10 is difficult to escape to the outside of the housing 10, the air outside the housing 10 is difficult to flow into the housing 10. That is, when the smoke detection unit 5 is provided at a position deviated from the center O1 of the housing 10 in the radial direction of the housing 10, the ease of air inflow in the circumferential direction of the housing 10 varies. Therefore, the smoke inflow characteristics in the circumferential direction of the housing 10 of the smoke detector 100 vary.

Therefore, in the second region Rg2 of the smoke detector 100 according to the embodiment, a second opening 2 having an opening area wider than the opening area of the first opening 1 is formed. Therefore, when uniform smoke is convected around the smoke detector 100, the amount of smoke flowing in from the second opening 2 is larger than the amount of smoke flowing in from the first opening 1. do. Therefore, the smoke detector 100 can suppress the variation between the smoke inflow characteristic of the angle range θ2 corresponding to the second region Rg2 and the smoke inflow characteristic of the angle range θ1 corresponding to the first region Rg1. As a result, the smoke detector 100 can suppress variations in smoke detection accuracy in the circumferential direction of the housing 10.

The labyrinth wall Lb of the smoke detector 100 according to the embodiment has an asymmetrical shape between the first region Rg1 and the second region Rg2 side. That is, the labyrinth wall Lb of the smoke detector 100 according to the embodiment has a first wall body Lb1 in which the first passage pt1 is formed and a second passage pt2 having a width wider than that of the first passage pt1. It is provided with a second wall body Lb2 in which a smoke is formed. Therefore, the smoke flowing into the housing 10 is difficult to pass through the first wall body Lb1, but the smoke flowing into the housing 10 easily passes through the second wall body Lb2. Therefore, the smoke detector 100 can suppress the variation between the smoke inflow characteristic of the angle range θ2 corresponding to the second region Rg2 and the smoke inflow characteristic of the angle range θ1 corresponding to the first region Rg1. As a result, the smoke detector 100 can suppress variations in smoke detection accuracy in the circumferential direction of the housing 10.

The partition member 3 of the smoke detector 100 according to the embodiment includes an inclined surface 3A. Therefore, the smoke that has passed through the second opening 2 smoothly flows into the smoke detection unit 5. Further, when the partition member 3 is provided with the inclined surface 3A, the second space SP2 in which the battery 7 or the like is provided can be expanded as compared with the case where the entire partition member 3 is flat.

In the embodiment, the aspect in which the first opening 1 is provided with a plurality of openings and the second opening 2 is also provided with a plurality of openings has been described, but the present invention is not limited to this aspect. For example, the first opening 1 may be composed of a single opening, and the second opening 2 may also be composed of a single opening.

In the embodiment, the aspect in which the first region Rg1 and the second region Rg2 are divided by the vertical plane L1 (see FIG. 1) that divides the housing 10 into two equal parts has been described, but the embodiment is limited to this aspect. Not done. The vertical plane L1 that divides the first region Rg1 and the second region Rg2 may be displaced toward the side closer to the smoke detection unit 5 or may be displaced toward the side away from the smoke detection unit 5. That is, the straight line L10 in the vertical plane L1 may be deviated from the position shown in FIG. 4 to the side closer to the smoke detection unit 5, or may be deviated to the side farther from the smoke detection unit 5.

6A and 6B are explanatory views of a modified example 1 of the smoke detector 100 according to the embodiment of the present invention, and FIG. 6B is an explanatory diagram of the modified example 2 of the smoke detector 100 according to the embodiment of the present invention. It is a figure. As shown in FIG. 6A, in the first modification, the through hole Op is formed in the portion of the optical table 3C on the second region Rg2 side. Further, the positions of the center O2 of the smoke detection unit 25 and the through hole Op do not match. Further, the optical table cover 40 has a configuration corresponding to the cover member, and projects toward the first region Rg1 side. Specifically, the portion of the side surface portion of the optical table cover 40 on the first region Rg1 side is formed in an elliptical arc shape, and the portion of the side surface portion of the optical table cover 40 on the second region Rg2 side is formed. It is composed of a circular arc. For example, the center O2 of the smoke detection unit 25 coincides with at least one of the center of the ellipse and the center of the circle of the optical table cover 40.

Since the optical base cover 40 of the smoke detector 100 according to the first modification projects toward the first region Rg1, the length of the first passage pt1 of the first wall body Lb1 becomes longer by that amount. That is, the labyrinth wall Lb20 in the first modification is configured so that the length of the first passage pt1 is longer than the length of the second passage pt2. Therefore, the smoke that has flowed into the housing 10 from the first region Rg1 side is less likely to flow into the through hole Op through the first wall body Lb1, but has flowed into the housing 10 from the second region Rg2 side. Smoke easily flows into the through hole Op through the second wall body Lb2. Therefore, the smoke detector 100 according to the first modification has a variation between the smoke inflow characteristic of the angle range θ2 corresponding to the second region Rg2 and the smoke inflow characteristic of the angle range θ1 corresponding to the first region Rg1. It can be suppressed. As a result, the smoke detector 100 according to the first modification can suppress variations in smoke detection accuracy in the circumferential direction of the housing 10.

In the first embodiment, the light emitting unit 5A and the like and the labyrinth wall Lb are vertically partitioned by the partition member 3, and the smoke detection unit 5 has a two-stage configuration. That is, a light emitting unit 5A, a light receiving unit 5B, and a substrate 6 are provided on the upper side of the partition member 3, and a labyrinth wall Lb is provided on the lower side of the partition member 3. In the second modification, a light emitting unit (not shown), a light receiving unit (not shown), and a substrate 36 are provided on the lower side of the partition member 3, and the smoke detecting unit 35 has a one-stage configuration. In the second modification, the light emitting portion and the light receiving portion are provided on the labyrinth wall Lb30. That is, in the second modification, the light emitting portion and the light receiving portion are provided in the smoke inflow space 35D formed between the optical table 30C and the optical table cover 34. Further, a substrate 36 is provided under the partition member 3, and an optical table 30C is provided under the substrate 36. In the second modification, the optical table 30C and the partition member 3 are separate bodies. Since the smoke detection unit 35 in the modified example 2 has a one-stage configuration, the smoke detector 100 according to the modified example 2 does not have the through hole Op, the smoke inspection cover 5a, and the partition wall 5C described in the first embodiment. For example, the optical table 30C and the optical table cover 34 have the function of the smoke detection cover 5a, and the labyrinth wall Lb30 has the function of the partition wall 5C. The smoke detector 100 according to the second modification can also obtain the same effect as the smoke detector 100 according to the first embodiment.

1 1st opening, 1A opening, 1B opening, 2nd opening, 2A opening, 2B opening, 2C opening, 3 compartment member, 3A inclined surface, 3B battery housing, 3C optical stand 4, Optical stand cover, 5 Smoke detection unit, 5A light emitting unit, 5B light receiving unit, 5C partition wall, 5D smoke inflow space, 5a smoke detection cover, 6 boards, 7 batteries, 10 housings, 11 first cover, 11A bottom surface , 11A1 speaker hole, 11B side surface, 11C corner, 12 second cover, 25 smoke detector, Lb20 labyrinth wall, 30C optical stand, Lb30 labyrinth wall, 34 optical stand cover, 35 smoke detector, 35D smoke inflow Space, 36 board, 40 optical stand cover, 100 smoke detector, 200 ceiling, D3 distance, Ds1 distance, Ds2 distance, Ds3 distance, L1 vertical plane, L10 straight line, Lb labyrinth wall, Lb1 first wall body, Lb2 first 2 wall body, O1 center, O2 center, Op through hole, Rg1 first region, Rg2 second region, SP1 first space, SP2 second space, pt1 first passage, pt2 second passage , Θ1 angle range, θ2 angle range.

Claims (1)

A ceiling-mounted enclosure, including a cylindrical side that extends downwards,
A smoke detector housed in the housing and provided at a position displaced in the radial direction of the housing from the center of the housing.
A partition member housed in the housing and partitioning the space inside the housing into a first space and a second space provided above the first space.
An optical table housed in the housing, formed in the partition member, and provided with the smoke detection unit, and
An optical table cover housed in the housing and provided on the optical table,
Equipped with
The side surface portion is within a second range in which the distance from the smoke detection portion is within the first range and the distance from the smoke detection portion is larger than the upper limit of the first range. Including the second area
In the first region, a first opening is formed in the circumferential direction.
In the second region, a second opening having an opening area wider than the opening area of the first opening is formed.
The first space is a space in which smoke flows in through the first opening and the second opening.
The partition member is formed with an inclined surface extending upward from the smoke detection portion side to the upper side of the second opening in the second region .
The smoke detection unit includes a light emitting unit, a light receiving unit that receives light from the light emitting unit, a smoke detection cover that houses the light emitting unit and the light receiving unit, and a smoke detection cover that is provided on the optical table and is housed in the optical table cover. Including the labyrinth wall that has been
The optical table cover and the labyrinth wall are provided in the first space.
The light emitting unit, the light receiving unit, and the smoke detection cover are provided in the second space.
The inclined surface formed on the partition member extends upward from the optical table side to the upper side of the second opening in the second region.
A smoke detector that features that.

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