JP2023096283A - Smoke detector - Google Patents

Abstract

To provide a smoke detector capable of preventing delay in smoke detection even when a space is formed on a rear surface side of a detector housing.SOLUTION: In a smoke detector 1, a housing 2 including a smoke detection part 7 inside is attached to an arrangement surface via an attachment base 20 to be attached to the rear surface side of the housing. On the rear surface side of the housing 2, a nearly peripheral shape vertical wall 12 is arranged on an inner peripheral side of an outer peripheral wall 4b of the housing 2, and a rear surface side space part 13 surrounded by the vertical wall 12 is arranged.SELECTED DRAWING: Figure 3

Description

This invention relates to smoke detectors.

In the case of a photoelectric smoke detector, a light-receiving element located in the smoke detection section receives scattered light from a light-emitting element located in the smoke detection section in the smoke detection section into which smoke is introduced. Configured to detect smoke based on quantity. It is mainly used as a fire detector and installed on the ceiling surface, wall surface, etc. of the building to be monitored. Specific examples of applications include residential fire alarms and fire detectors for automatic fire alarm systems. Some residential fire alarms are configured as composite alarms that detect gas leaks (leakage of city gas, etc.), CO (carbon monoxide), and the like.

A smoke sensor generally has a sensor housing mounted on an installation surface via a mounting base (see Patent Document 1, for example).

JP 2012-226657 A

In this type of smoke sensor, if a space is provided on the rear side of the sensor housing (see, for example, FIG. 5 of Patent Document 1), an air current will flow through the space on the rear side, Smoke may flow out of the smoke detection section into the space on the back side, or outside air may flow into the smoke detection section from the space on the back side, reducing the smoke concentration in the smoke detection section. That is, if a space is provided on the rear side of the sensor housing, there is a possibility that smoke detection will be delayed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a smoke sensor that can prevent a delay in detecting smoke even if a space is provided on the rear side of the sensor housing. .

The present invention relates to a smoke sensor in which a housing having a smoke detection section therein is attached to an installation surface via a mounting base attached to the rear side of the housing, and the rear side of the housing is provided with a The smoke sensor is characterized in that a substantially circumferential upright wall is provided on the inner peripheral side of the outer peripheral wall of the body, and a rear side space portion surrounded by the upright wall is provided.

In the present invention, the standing wall has a cutout portion and an inner wall portion that is arcuately provided from both end sides of the cutout portion to the inner peripheral side so as to close the cutout portion, and the inner wall portion and the An operation unit may be provided between the outer peripheral walls of the housing. The mounting base may be mounted so as to cover the upright wall, and the back-side space may be covered with the mounting base. A battery storage section may be provided on the rear side of the housing so as to protrude toward the space section.

In this invention, a space is provided on the back side of the housing as the back side space, and a substantially circumferential upright wall is also provided to surround the back side space. Therefore, the surroundings of the back side space can be closed with a vertical wall, preventing smoke from flowing out from the smoke detection part into the back side space, and preventing outside air from flowing into the smoke detection part from the back side space. can be

Therefore, according to the present invention, it is possible to obtain a smoke sensor that can prevent a delay in detecting smoke even if a space is provided on the rear side of the housing.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front perspective view of a sensor housing, showing an example of an embodiment of the smoke sensor of the present invention; It is a rear view of a sensor housing same as the above. It is a perspective view of the back side of a sensor housing|casing same as the above. It is a perspective view of the back side of the state which attached the mounting base to the sensor housing same as the above. It is an exploded perspective view of a sensor housing same as the above.

An embodiment of the smoke sensor of the present invention will be described below as a smoke sensor 1 with reference to FIGS. 1 to 5. FIG. The smoke detector of the present invention can be used as a fire detector provided to monitor the inside of a building or the like. It can be used as a fire detector for automatic fire alarm equipment, etc.).

Here, the terms such as "front" and "back" used to describe the present invention are used according to the position, direction, etc. when the smoke detector 1 is installed. .

[Equipment overview]
The smoke detector 1 is used as a residential fire alarm, and has a smoke detector 7 inside its housing 2 (see FIG. 5). The housing 2 is composed of a main body 3 and a front cover 4 attached to the front side thereof, and has a flat and thin shape as a whole without a protruding portion for the smoke detector on the front side. The main body 3 is composed of a base portion 5 and an intermediate plate portion 6 attached to the front side thereof (see FIG. 5).

More specifically, the smoke detection section 7 is provided on a circuit board 9 provided on the back side of the intermediate plate portion 6, and when the intermediate plate portion 6 is attached to the base portion 5, the intermediate plate portion It is exposed from the back side to the front side through a through hole provided in the portion 6 (see FIG. 5). Around the smoke detector 7, a smoke flow path guides the smoke flowing in from a smoke inlet 4a provided in the outer peripheral wall 4b of the front cover 4 toward the smoke detector 7 on the front side of the middle plate 6. A channel wall 10 forming 11 is provided (see FIG. 5). The smoke detection unit 7 detects smoke guided by the smoke flow path 11 and entering.

The smoke detector 1 is attached to an installation surface such as a ceiling surface or a wall surface in a building to be monitored via an attachment base 20 (see FIG. 4) attached to the back side of the housing 2, and the monitor target is installed. When the smoke detection unit 7 detects smoke exceeding a predetermined concentration generated in a building or the like, an alarm is issued.

The mounting base 20 is composed of a bottom wall portion 20a and a peripheral wall portion 20b, and has a cylindrical shape with a bottom as a whole. becomes (see FIG. 4).

[Standing wall, back side space]
Basic configuration In the smoke sensor 1, the outer peripheral wall 4b of the front cover 4, which is an example of the outer peripheral wall of the housing 2, is provided on the back side of the housing 2, and the inner peripheral side of the outer peripheral wall 4b is substantially A circumferential upright wall 12 is provided, and a rear side space 13 surrounded by the upright wall 12 is provided.

In the smoke sensor 1 , a space is provided on the back side of the housing 2 as the back side space 13 , and a substantially circumferential standing wall 12 surrounding the back side space 13 is also provided. Therefore, the surroundings of the back side space 13 can be closed by the vertical wall 12, preventing smoke from flowing out from the smoke detection section 7 into the back side space 13, and preventing the smoke detection section 7 from flowing out from the back side space 13. It is possible to prevent outside air from flowing into the Therefore, even if a space is provided on the back side of the housing 2, it is possible to prevent delays in smoke detection.

・Specific examples of standing wall and back side space ・Arrangement of standing wall, etc. It is erected in a substantially circumferential shape along its peripheral edge on the rear surface of the . The front cover 4 is placed on the front side of the main body 3 , and the vertical wall 12 is located on the inner peripheral side of the outer peripheral wall 4 b of the front cover 4 in the covered state.

..Relationship with Mounting Base The mounting base 20 is mounted on the rear side of the housing 2 in a manner to cover the upright wall 12, and the rear side space 13 is covered with the mounting base 20 (see FIG. 4). The peripheral wall portion 20b of the mounting base 20 is positioned on the outer peripheral side of the vertical wall 12, and closes the rear side space portion 13 together with the vertical wall 12, so that smoke flows out from the smoke detector 7 into the rear side space portion 13. , and prevents outside air from flowing into the smoke detector 7 from the space 13 on the back side.

The attachment of the attachment base 20 to the back side of the housing 2 is performed by fitting them together. In the illustrated example, an insertion piece 20c provided on the inner surface of the bottom wall 20a of the mounting base 20, which can be inserted and removed by rotation, and the top of the peripheral wall 12a of the standing wall 12 of the housing 2, which will be described later. It is assumed that this is performed by fitting with the provided receiving portion 12d (see FIGS. 2 to 4).

.. Missing portion of vertical wall, inner wall portion, operation portion More specifically, the vertical wall 12 has a peripheral wall portion 12a, thereby forming a substantially peripheral shape. The cutout portion 12b is formed by cutting off a portion, and is connected to the peripheral wall portion 12a while forming an arc from both end sides of the cutoff portion 12a to the inner peripheral side so as to close the inner peripheral side of the cutout portion 12b. It has an inner wall portion 12c which is lined (see FIGS. 2 and 3). The peripheral wall portion 12a and the inner wall portion 12c constitute the standing wall 12, and are both erected on the back surface of the base portion 5. Above, an operation unit 14 for various settings (initial settings, etc.) is provided (see FIGS. 2 and 3).

The operating portion 14 is operated while the mounting base 20 is not attached to the back side of the housing 2 . At this time, the missing portion 12b provided on the standing wall 12 facilitates access to the operating portion 14, thereby improving the operability thereof. While the operability can be improved in this way, since the inner peripheral side of the space on the inner peripheral side of the missing portion 12b is closed by the inner wall portion 12c, the space on the inner peripheral side of the missing portion 12b is closed. It is possible to prevent smoke from flowing out of the smoke detecting section 7 into the back side space 13 and prevent outside air from flowing into the smoke detecting section 7 from the back side space 13 through the opening. In addition, since the outer peripheral side of the space on the inner peripheral side of the lacking portion 12b is closed by the peripheral wall portion 20b of the mounting base 20, the space on the inner peripheral side of the lacking portion 12b is also connected to the back side. It is possible to prevent the smoke from flowing out of the smoke detecting part 7 into the space part 13 and prevent the outside air from flowing into the smoke detecting part 7 from the rear side space part 13 .

In the illustrated example, the cutout portion 12b has no wall-like portion, but may be a notch portion in which a wall-like portion remains. Specifically, the notch portion can be formed by notching the top portion side while leaving the base portion side of the peripheral wall portion 12a of the standing wall 12 as a wall-like portion.

Here, more specifically, the rear space 13 is formed between the inner surface of the bottom wall 20 a of the mounting base 20 . In the illustrated example, the standing wall 12 is provided at a height such that the top of the peripheral wall portion 12a substantially reaches the inner surface of the bottom wall portion 20a of the mounting base 20 when the mounting base 20 is mounted on the housing 2. I am assuming. This is because the fitting portions of the housing 2 and the mounting base 20 are provided on the top of the peripheral wall portion 12a of the vertical wall 12 and the inner surface of the bottom wall portion 20a of the mounting base 20. 12b) and the peripheral wall portion 20b of the mounting base 20 both close the periphery of the rear side space portion 13 to prevent smoke from flowing out from the smoke detection portion 7 into the rear side space portion 13, Since it prevents outside air from flowing into the smoke detection unit 7 from the space 13, the heights of both are set so that the mounting base 20 is attached to the housing 2 and the peripheral wall portion 20b of the mounting base 20 is It is preferable to overlap at least the inside and the outside while being located on the outer peripheral side of the standing wall 12 .

The height of the inner wall portion 12c is preferably about the same as that of the peripheral wall portion 12a, but in the illustrated example, the height is lower than that of the peripheral wall portion 12a (see FIG. 3). This is to avoid interference by the inner wall portion 12c when the housing 2 and the mounting base 20 are fitted together.

Furthermore, in a state in which the front cover 4 is placed on the front side of the main body 3, the vertical wall 12 is positioned on the inner peripheral side of the outer peripheral wall 4b of the front cover 4, and the operation portion 14 is located on the inner wall portion of the vertical wall 12. 12 c and the outer peripheral wall 4 b of the front cover 4 . It is provided so that the height of the wall is lower than the height of the wall (see FIG. 3). As a result, even when the front cover 4 is placed on the front side of the main body 3, access to the operation part 14 can be facilitated through the missing part 12b of the vertical wall 12, and the operability is improved. can be done.

[Battery compartment]
The housing 2 is provided with a battery housing portion 15 in which a battery is housed (see FIGS. 2 and 3). The battery housing portion 15 is provided in the base portion 5 of the main body 3 , but in the illustrated example, a part of the thickness direction of the battery housing portion 15 protrudes into the back side space portion 13 on the back side of the base portion 5 . (see FIGS. 2 and 3). That is, the rear-side space portion 13 is used as an arrangement space portion for the battery housing portion 15 . The battery housing portion 15 is also provided in a state of protruding to the front side of the base portion 5 on the opposite side, but the width of the protrusion to the inner surface side of the base portion 5 is the same as that protruding into the back side space portion 13 . can be reduced (see FIG. 5).

As a result, as an arrangement structure inside the housing 2, it is possible to arrange the space on the middle plate 6 where the smoke detector 7, the smoke flow path 11, etc. are located, and the battery storage section 15 at different levels in the thickness direction. The battery housing portion 15 can be arranged at a position where the smoke detecting portion 7, the flow channel wall 10, the smoke flow channel 11, etc. are provided on the intermediate plate portion 6 so as not to protrude toward the space through which the smoke flows (Fig. 5). That is, the battery housing portion 15 can be arranged at a position that does not interfere with the flow of smoke.

[Configuration change example]
The embodiments of the present invention have been described above with reference to FIGS. 1 to 5, but the specific configuration is not limited to the above embodiments, and design changes, etc., within the scope of the gist of the present invention. is also included.

1: Smoke detector 2: Housing 3: Main body 4: Front cover 4a: Inlet 4b: Peripheral wall 5: Base part 6: Middle plate part 7: Smoke detection part 9: Circuit board 10: Channel wall 11: Smoke channel 12: Standing wall 12a: Peripheral wall 12b: Missing part 12c: Inner wall 12d: Receiving part 13: Back side space 14: Operation part 15: Battery storage part 20: Mounting base 20a: Bottom wall 20b: Peripheral wall 20c: insertion piece

Claims (3)

A smoke detector in which a housing provided with a smoke detection part is attached to an installation surface via a mounting base attached to the back side thereof,
A smoke detector, wherein a substantially circumferential standing wall is provided on the back side of the housing on the inner peripheral side of the outer peripheral wall of the housing, and a back side space surrounded by the standing wall is provided. vessel. The standing wall has a cutout portion and an inner wall portion that is arcuately provided from both end sides of the cutout portion to the inner peripheral side so as to close the cutout portion,
2. The smoke sensor according to claim 1, further comprising an operating section provided between the inner wall section and the outer peripheral wall of the housing. 3. The smoke sensor according to claim 1, wherein the mounting base is mounted so as to cover the upright wall, and the rear side space is covered with the mounting base.

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