JP2020113030A - Fire detector - Google Patents

Abstract

To provide a fire detector capable of maintaining detection accuracy of the fire detector.SOLUTION: A fire detector 1 comprises: incidence restraining means for restraining entry of ambient light into a detection space 60, and allowing gas containing a detection target to flow in and out of the incidence restraining means; containing means for containing the incidence restraining means; and a light shielding wall 140 provided so as to surround the incidence restraining means inside the containing means. The incidence restraining means includes: a detection unit cover 70 that covers a part of the detection space 60; and a detection unit main body 80 that is provided closer to an installation surface than the detection unit cover 70 and covers the other part of the detection space 60. The light shielding wall 140 is configured such that a boundary 150 between the detection unit cover 70 and the detection unit main body 80 overlaps the light shielding wall 140 when viewed from a direction orthogonal to the installation surface.SELECTED DRAWING: Figure 4

Description

The present invention relates to a fire detection device.

BACKGROUND ART Conventionally, a technique has been proposed for a smoke detector that detects a fire in a monitoring area, for allowing smoke to flow into the smoke detector while blocking ambient light. This technique discloses a smoke detector including a smoke detection space and a smoke detection unit that houses the smoke detection space (see, for example, Patent Document 1). In addition, the smoke detection section includes a smoke detection section body that covers the side surface on the installation surface side of the smoke detection space, and a smoke detection section cover that covers the side surface on the side opposite to the installation surface side and the side surface on the side of the smoke detection space. Equipped with.

JP-A-8-171685

However, in the above-mentioned conventional smoke detector, as described above, the smoke detecting section is configured by combining the smoke detecting section main body and the smoke detecting section cover. Since disturbance light may enter the smoke detection space through the boundary with the cover, it may be difficult to maintain the detection accuracy of the smoke detector.Therefore, the detection accuracy of a fire detector such as a smoke detector may be difficult to maintain. From the viewpoint of maintaining the above, there was room for improvement.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a fire detection device capable of maintaining the detection accuracy of the fire detection device.

In order to solve the above problems and achieve the object, the fire detection device according to claim 1 is a fire detection device that is attached to the installation surface of an installation target, and is a fire for detecting a fire in a monitoring area. A detection device, a detection space for detecting a detection target, and an incidence suppression unit for suppressing the entry of ambient light into the detection space, wherein a gas containing the detection target is applied to the incidence suppression unit. Incident suppressing means capable of flowing in and out, and accommodating means accommodating the incident suppressing means, the accommodating means capable of causing the gas to flow in and out of the accommodating means, and the inside of the accommodating means. A light shielding wall provided so as to surround the incidence suppressing means, wherein the incidence suppressing means covers a part of the detection space, and the installation surface rather than the first incidence suppressing means. A second incidence suppressing means provided on the side, the second incidence suppressing means covering another part of the detection space, and the first incidence suppressing means when viewed from a direction orthogonal to the installation surface. The light shielding wall is configured such that the boundary portion between the second incident suppressing means and the light shielding wall overlap with each other.

The fire detection device according to claim 2 is the fire detection device according to claim 1, wherein the accommodating means includes a cover means for covering a side surface of the incident suppressing means on the side of the installation surface, and the light shielding wall includes: The first light-shielding wall is provided in the cover means, and the first light-shielding wall is configured such that the boundary portion is located closer to the installation surface side than the tip of the first light-shielding wall.

The fire detection device according to claim 3 is the fire detection device according to claim 1 or 2, wherein the accommodating means accommodates the inside suppressing means and the outside accommodation that accommodates the inside accommodating means. Means, the light-shielding wall is a second light-shielding wall provided on a side portion of the side portion of the inner housing means opposite to the installation surface side, and the boundary portion has the second portion. A second light shielding wall configured to be located on the side opposite to the installation surface side with respect to the tip of the light shielding wall was provided.

The fire detection device according to claim 4 is the fire detection device according to claim 1, wherein the accommodating means includes an inner accommodating means that accommodates the incident suppressing means, and an outer accommodating means that accommodates the inner accommodating means. A cover means provided on the installation surface side with respect to the inner housing means, the cover means covering a side surface of the incident suppression means on the installation surface side, wherein the light shielding wall is provided on the cover means. A first light-shielding wall provided and a second light-shielding wall provided on a side of the inner housing means opposite to the installation surface side, and the first light-shielding wall and the first light-shielding wall. The first light shielding wall and the second light shielding wall are configured such that the inner housing means and the cover means can be fitted to each other through the two light shielding walls.

The fire detection device according to claim 5 is the fire detection device according to claim 1, wherein the accommodating means includes an inner accommodating means that accommodates the incident suppressing means, and an outer accommodating means that accommodates the inner accommodating means. A first opening portion provided on a side portion of the side portion of the inner accommodation means opposite to the side portion on the installation surface side, wherein the gas flowing into the outer accommodation means is introduced into the inner accommodation means. A second opening provided on a side opposite to the side on the installation surface side of the side of the incidence suppressing means, and a first opening for flowing into the inside of the inside. A second opening for allowing the gas that has flowed into the storage means to flow into the detection space, and the second opening of the side surface of the inner storage means opposite to the installation surface side 1 the incidence suppressing means such that the peripheral edge of the opening and the peripheral edge of the second opening of the side of the incident suppressing means opposite to the side of the installation surface are continuous. And the inner housing means are integrally formed.

A fire detection device according to a sixth aspect is the fire detection device according to any one of the first to fifth aspects, wherein the outer diameter of the incidence suppressing means is increased as the distance from the installation surface is increased.

According to the fire detection device of claim 1, the housing means for housing the incidence suppressing means, the housing means capable of allowing gas to flow in and out of the housing means, and the incidence suppressing means inside the housing means. A light-shielding wall provided so as to surround the first incidence suppression means, the incidence suppression means covering a part of the detection space, and a second incidence surface provided on the installation surface side of the first incidence suppression means. A second incidence suppressing means that covers another part of the detection space, and is a boundary portion between the first incidence suppressing means and the second incidence suppressing means when viewed from a direction orthogonal to the installation surface. Since the light-shielding wall is configured so that the light-shielding wall and the light-shielding wall overlap with each other, it is possible to prevent the disturbance light from entering the detection space through the boundary portion and to the outside through the boundary portion. Further, it is possible to prevent the internal disturbance light from entering through the boundary portion, and it is possible to maintain the detection accuracy of the fire detection device.

According to the fire detection device of claim 2, the light shielding wall is the first light shielding wall provided in the cover means, and the boundary portion is located closer to the installation surface side than the tip of the first light shielding wall. Since the first light shielding wall configured as described above is provided, it is possible to prevent the disturbance light from entering the detection space through the boundary portion by the first light shielding wall, and at the same time, the internal disturbance that is output to the outside through the boundary portion. Light can be prevented from entering through the boundary portion, and the detection accuracy of the fire detection device can be easily maintained.

According to the fire detection device of claim 3, the light shielding wall is a second light shielding wall provided on a side portion of the side portion of the inner housing means opposite to the installation surface side, and the boundary portion is Since the second light-shielding wall is provided so as to be located on the side opposite to the installation surface side with respect to the tip of the second light-shielding wall, the disturbance light enters the detection space via the boundary portion by the second light-shielding wall. Can be suppressed, and the internal disturbance light emitted to the outside via the boundary can be suppressed from entering via the boundary, and the detection accuracy of the fire detection device can be easily maintained.

According to the fire detection device of claim 4, the light shielding wall is provided on the first light shielding wall provided on the cover means and on a side portion of the side portion of the inner housing means opposite to the installation surface side. And a second light-shielding wall, and the first light-shielding wall and the second light-shielding wall are arranged so that the inner housing means and the cover means can be fitted to each other through the first light-shielding wall and the second light-shielding wall. With this configuration, the inner housing means and the cover means can be fitted to each other via the first light shielding wall and the second light shielding wall, and the inner housing means and the cover means can be firmly connected to each other.

According to the fire detection device of claim 5, of the side portion of the inner housing means opposite to the side of the installation surface side, the peripheral portion of the first opening and the side of the incident suppression means on the installation surface side. Since the incident suppressing means and the inner accommodation means are integrally formed so that the peripheral portion of the second opening of the side portion on the side opposite to the portion is continuous, the first accommodation portion of the inner accommodation means It is possible to suppress the formation of a gap between the peripheral portion and the peripheral portion of the second opening of the incidence suppressing unit, and it is possible to suppress the incidence of ambient light or internal light in the detection space.

According to the fire detection device of claim 6, since the outer diameter of the incidence suppressing means is increased as approaching the installation surface, the side portion of the side portion of the incidence suppressing means can be formed in a tapered shape. The external disturbance light or the internal disturbance light that has entered the incidence suppressing means can be effectively attenuated.

It is a side view which shows the attachment condition of the fire detection apparatus which concerns on embodiment. It is a bottom view which shows the fire detection apparatus in the state which removed the attachment base. FIG. 3 is a sectional view taken along the line AA of FIG. 2. FIG. 3 is a cross-sectional view taken along the line BB of FIG. 2 (not shown). FIG. 5 is an enlarged view around the area C in FIG. 4.

Hereinafter, an embodiment of a fire detection device according to the present invention will be described in detail with reference to the drawings. First, the basic concept of the embodiment [I] will be described, then the specific contents of the embodiment [II] will be described, and finally, a modification of the embodiment [III] will be described. However, the present invention is not limited to the embodiments.

[I] Basic Concept of Embodiment First, the basic concept of the embodiment will be described. The embodiment generally relates to a fire detection device attached to an installation surface of an installation object, and relates to a fire detection device for detecting a fire in a monitoring area.

Here, in the embodiment, the “fire detection device” is a device that detects and notifies a fire in the monitoring area based on the detection result of the detection target, and includes, for example, optical, electrical, and thermal It is a concept that includes various fire detectors and fire alarms. Further, the “monitoring area” is an area to be monitored, and is a concept including an area inside the building and an area outside the building. Further, the “building” may have any specific structure or type, but is, for example, a concept including a detached house, an apartment house such as an apartment or a condominium, an office building, an event facility, a commercial facility, and a public facility. Is. Further, “notifying” is a concept including, for example, outputting predetermined information to an external device, displaying or outputting predetermined information via an output unit (display unit or voice output unit), and the like. is there. Hereinafter, in the embodiment, a case where the “fire detection device” is a “thermological and optical fire detector” and the “monitoring area” is an “area inside the office building” will be described.

[II] Specific Contents of Embodiment Next, specific contents of the embodiment will be described.

(Constitution)
First, the configuration of the fire detection device according to the embodiment will be described. FIG. 1 is a side view showing a mounting state of a fire detection device according to an embodiment. FIG. 2 is a bottom view showing the fire detection device with a mounting base described later removed. 3 is a sectional view taken along the line AA of FIG. In the following description, the X direction of FIG. 1 is the left-right direction of the fire detection device (-X direction is the left direction of the fire detection device, +X direction is the right direction of the fire detection device), and the Y direction of FIG. 2 is the fire detection device. Front-back direction (+Y direction is the forward direction of the fire detection device, -Y direction is the backward direction of the fire detection device), Z direction of FIG. 1 is the vertical direction of the fire detection device (+Z direction is the upward direction of the fire detection device, -Z direction). The direction is called the downward direction of the fire detection device).

The fire detection device 1 is a device that detects heat in a monitoring area and also detects and notifies a detection target (for example, smoke) contained in gas. This fire detection device 1 is installed indoors in a building on an installation surface 2 on the lower surface of the ceiling of the building, and as shown in FIGS. 1 to 3, a mounting base 10, an outer cover 20, an inner cover 30, The inflow space 40, the insect screen 50, the detection space 60, the detection unit cover 70, the detection unit main body 80, the lower cover 90, and the substrate 100 are provided.

(Structure-Mounting base)
Returning to FIG. 1, the mounting base 10 is a mounting means for mounting the outer cover 20 on the installation surface 2. The mounting base 10 is configured by using, for example, a known mounting base for a fire detection device (as an example, a substantially plate-shaped mounting base made of resin), and the like, as shown in FIG. It is fixed by a fixing tool or the like.

(Structure-Outer cover)
The outer cover 20 is an outer housing unit that houses the inner cover 30, the inflow space 40, the insect net 50, the detection space 60, the detection unit cover 70, the detection unit main body 80, the lower cover 90, and the substrate 100, and is a detection target. It is an outer housing means capable of flowing a gas containing the gas into and out of the outer housing means. The outer cover 20 is formed of, for example, a light-shielding resin material, and includes an outer cover body 21, a top surface portion 22, and a rib portion 23, as shown in FIGS. 1 to 3.

Of these, the outer cover body 21 is a basic structure of the outer cover 20. The outer cover body 21 is formed of, for example, a substantially hollow columnar body whose upper and lower surfaces are open, and the upper end portion of the outer cover body 21 contacts the lower surface of the mounting base 10 as shown in FIG. And is fixed to the mounting base 10 by a fitting structure (or a fixture) or the like.

The top surface portion 22 is a partitioning means for partitioning the inflow space 40. The top surface portion 22 is formed of, for example, a substantially circular plate-like body, and is provided substantially horizontally below the outer cover body 21 as shown in FIGS. 1 to 3.

The rib portion 23 is a partitioning means for partitioning the inflow space 40. The rib portion 23 is formed of a substantially plate-shaped body, and is provided vertically between the outer cover body 21 and the top surface portion 22. Specifically, as shown in FIGS. 1 and 3, A plurality of outer covers 20 are provided radially from near the center, and are connected to the outer cover body 21 and the top surface portion 22. The details of the structure of the outer cover 20 will be described later.

(Structure-Inflow space)
Returning to FIG. 1, the inflow space 40 is a space for guiding the gas that has flowed into the outer cover 20 to a gas inflow portion (a first opening 30a described later) of the inner cover 30, and is shown in FIGS. As shown, in the inner space of the outer cover 20, a gap between the top surface portion 22 and the inner cover 30 is formed as an inflow space 40.

(Structure-Inner cover)
The inner cover 30 is an inner housing unit that houses the detection space 60, the detection unit cover 70, the detection unit main body 80, and the substrate 100, and allows gas containing a detection target to flow in and out of the inner housing unit. It is an inner housing means and a partitioning means for partitioning the inflow space 40. The inner cover 30 is, for example, a substantially hollow columnar body having an open upper surface, and is formed of a resin material having a light shielding property. As shown in FIG. The lower side of 30 is provided so as to face the top surface 22 of the outer cover 20 via the inflow space 40. Further, as shown in FIG. 3, a first opening 30a is formed on the lower side of the inner cover 30. The first opening 30a is an opening for allowing the gas that has flowed into the outer cover 20 to flow into the inner cover 30, and as shown in FIG. 3, of the side portions of the inner cover 30 on the installation surface 2 side. It is provided in a substantially central portion of a side portion (a lower side portion of the inner cover 30 in FIG. 3) opposite to the side portion and a portion in the vicinity thereof. The "outer cover 20,""inner cover 30," and "lower cover 90" described above correspond to the "accommodating means" in the claims.

(Configuration-Detection space)
The detection space 60 is a space for detecting an object to be detected. As shown in FIG. 3, among the inner spaces of the inner cover 30, the space surrounded by the detection unit cover 70 and the detection unit main body 80 is the detection space 60. Is formed as.

(Structure-Detector cover)
The detection unit cover 70 is a first incidence suppressing unit for suppressing the incidence of ambient light on the detection space 60, and is capable of causing a gas containing a detection target to flow into and out of the first incidence suppressing unit. It is a first incidence suppressing unit that covers the detection space 60. The detection unit cover 70 is a substantially hollow columnar body having an open upper surface, and is made of a resin material having a light shielding property. In addition, as shown in FIG. 3, in the detection unit cover 70, the lower side portion of the detection unit cover 70 is located inside the inner cover 30, and the lower side of the detection unit cover 70 is located above the outer cover 20 via the first opening 30 a and the inflow space 40. It is arranged so as to face the surface portion 22 and is fixed to the detection portion main body 80. Further, as shown in FIG. 3, a second opening 70a is formed on the lower side of the detection unit cover 70. The second opening 70a is an opening for allowing the gas that has flowed into the inner cover 30 to flow into the detection space 60, and as shown in FIG. 3, among the side portions of the detection unit cover 70, the installation surface 2 side. Is provided in a portion corresponding to the first opening portion 30a of the side portion (the lower side portion in FIG. 3) opposite to the side portion.

(Structure-insect net)
The insect screen 50 is a net for preventing insects outside the fire detection device 1 from entering the detection space 60. The insect repellent net 50 is configured by using a mesh-shaped and circular net, and is attached to the detection unit cover 70 as shown in FIG.

(Structure-Detector body)
The detection unit main body 80 is a second incidence suppression unit for suppressing the incidence of ambient light on the detection space 60, and is capable of causing a gas containing a detection target to flow into and out of the second incidence suppression unit. It is a second incidence suppressing means that is present and covers another part of the detection space 60. The detection unit main body 80 is, for example, a thick plate-shaped body (for example, a substantially circular plate-shaped body) formed of a resin material having a light-shielding property, and is closer to the installation surface 2 side than the detection unit cover 70. It is provided (on the upper side in FIG. 3), specifically, as shown in FIG. 3, it is arranged so as to cover the upper surface of the detection unit cover 70, and is fixed to the substrate 100 by a fixture or the like. It is fixed. The "detection unit cover 70" and the "detection unit main body 80" described above correspond to the "incident suppression unit" in the claims.

(Structure-Bottom cover)
The lower cover 90 is a cover unit that covers the side surface of the inner cover 30 on the installation surface 2 side. The lower cover 90 has a substantially hollow cylindrical shape with an open lower surface, and is made of, for example, a light-shielding resin material. Further, as shown in FIG. 3, the lower cover 90 is provided so as to cover the inner cover 30 from above, is fixed to the outer cover 20 by a fitting structure, and is attached to the mounting base 10. Is fixed by a fixture or the like through a first mounting hole (not shown) formed in the mounting member 91.

(Structure-Board)
The board 100 is a mounting unit on which various electric circuits (not shown) are mounted. The substrate 100 is configured by using, for example, a well-known plate-shaped circuit board, and as shown in FIG. 3, inside the lower cover 90, is spaced apart from the upper end portion and the lower end portion of the lower cover 90. It is arranged substantially horizontally and is fixed to the lower cover 90 by a fixing tool through a mounting hole (not shown) formed in the lower cover 90 and a second mounting hole (not shown) formed in the mounting member 91. There is.

In addition to mounting known components (electric components) used in the conventional fire detection device 1 on the board 100, a first light emitting unit (not shown) and a second light emitting unit (not shown) are also provided. A light receiving unit (not shown), a heat sensing unit 110, a display unit (not shown), a communication unit (not shown), a power supply unit (not shown), a control unit (not shown), and a storage unit (not shown). Has been done.

(Structure-Substrate-First light emitting portion, second light emitting portion, light receiving portion)
Of these, the first light emitting unit is a first light emitting unit that irradiates the detection space 60 with detection light (hereinafter, referred to as “first detection light”), and is, for example, a known light emitting element (such as an infrared LED). It is configured using. The second light emitting unit is a second light emitting unit that irradiates the detection space 60 with detection light having a wavelength different from that of the first detection light (hereinafter, referred to as “second detection light”), and for example, a known light emitting element. (For example, a blue LED or the like) is used. The light receiving unit receives the scattered light of the smoke of the first detection light emitted from the first light emitting unit, outputs the first light receiving signal corresponding to the received scattered light, and emits the light from the second light emitting unit. It is a light receiving means for receiving scattered light of smoke of the generated second detection light and outputting a second light receiving signal according to the received scattered light. For example, a known light receiving element (photodiode or the like as an example) is used. It is configured. In addition, the method of installing the first light emitting unit, the second light emitting unit, and the light receiving unit is arbitrary, but in the embodiment, the first detection light or the second detection light emitted from the first light emitting unit or the second light emitting unit is used. The detection light is installed so as to avoid being directly received by the detection light via various optical path holes of the detection unit main body 80. For example, the angle between the optical axis of the first light emitting portion (hereinafter referred to as “first light emitting side optical axis”) and the optical axis of the light receiving portion (hereinafter referred to as “light receiving side optical axis”) is approximately 135°. The first light emitting unit and the light receiving unit are installed at the positions. In addition, the second light emitting unit and the light receiving unit are installed at positions where the angle between the optical axis of the second light emitting unit (hereinafter, referred to as “second light emitting side optical axis”) and the light receiving side optical axis is about 90°. ing.

(Structure-Substrate-Thermal sensing unit, display unit, communication unit, power supply unit)
The heat sensing unit 110 is heat sensing means for detecting a fire. The heat sensing unit 110 is configured by using, for example, a known heat sensing element (as an example, a thermistor), and as shown in FIGS. 1 to 3, the inner cover 30, the detection unit cover 70, and the detection unit. A part of the heat detection unit 110 is arranged to be exposed to the outside of the fire detection device 1 through an insertion hole (not shown) provided in each of the main bodies 80 and an insertion hole 120 of the outer cover 20 described later. .. The display unit is a display unit for displaying various kinds of information (for example, information indicating whether or not a fire has been detected), and is configured using, for example, a known display unit (LED or the like). The method of projecting light on the display unit is arbitrary, but for example, the insertion holes provided in each of the inner cover 30, the detection unit cover 70, and the detection unit main body 80 and the insertion hole 120 of the outer cover 20 described later. For example, the light from the display unit may be guided to the outside of the fire detection device 1 through a light guide (not shown) inserted in the light projection to project the light. The communication unit is a communication unit that communicates with an external device (for example, a receiver). The power supply unit is a power supply unit that supplies electric power supplied from a commercial power supply or a battery (not shown) to each unit of the fire detection device 1.

(Structure-Board-Control unit, storage unit)
The control unit is a control unit that controls the fire detection device 1. Specifically, the control unit includes a CPU, various programs that are interpreted and executed on the CPU (including a basic control program such as an OS and an application program that is started on the OS and realizes a specific function), programs, and the like. It is a computer including an internal memory such as a RAM for storing various data. The storage unit is a storage unit that stores programs and various data necessary for the operation of the fire detection device 1. The storage unit is configured by using a rewritable recording medium, and for example, a non-volatile recording medium such as a flash memory can be used.

(Structure-Details of outer cover structure)
Returning to FIG. 1, the details of the configuration of the outer cover 20 will be described next. However, the outer cover 20 can be manufactured with an arbitrary shape, method, and material, unless otherwise specified.

In the embodiment, as shown in FIGS. 1 to 3, the top surface portion 22 of the outer cover 20 is provided with the insertion hole 120 and the guard portion 130.

(Structure-Details of outer cover structure-insertion hole)
Returning to FIG. 2, the insertion hole 120 is a through hole for exposing a part of the heat sensing unit 110 to the outside of the fire detection device 1 and irradiating the display light from the display unit to the outside of the fire detection device 1. is there.

Further, although the specific shape and size of the insertion hole 120 are arbitrary, in the embodiment, the planar shape of the insertion hole 120 is set to a substantially elliptical shape as shown in FIG. (Alternatively, it may be a polygon such as a quadrangle). In addition, the diameter of the insertion hole 120 is set so that only a part of the heat sensing unit 110 can be exposed to the outside and the display light can be emitted to the outside of the fire detection device 1. For example, the length is set to be longer than the sum of the diameter of the heat sensing unit 110 and the diameter of the light guide.

(Structure-Details of outer cover structure-Guard section)
Returning to FIG. 1, the guard unit 130 is a guard means for protecting the heat sensing means, and as shown in FIGS. 1 to 3, the first guard side rib 131, the second guard side rib 132, and the third guard. The side rib 133, the fourth guard side rib 134, and the guard side connecting portion 135 are provided.

(Structure-Details of outer cover structure-Guard section-First guard-side rib to fourth guard-side rib)
Returning to FIG. 2, the first guard-side rib 131, the second guard-side rib 132, the third guard-side rib 133, and the fourth guard-side rib 134 are basic structures of the guard section 130. The first guard-side rib 131, the second guard-side rib 132, the third guard-side rib 133, and the fourth guard-side rib 134 are formed of a long plate-like body, and are shown in FIGS. As shown, the heat sensing unit 110 is provided so as to cover the exposed portion of the fire detection device 1 and the periphery of the insertion hole 120. Specifically, the longitudinal direction of each of the first guard side rib 131, the second guard side rib 132, the third guard side rib 133, and the fourth guard side rib 134 is provided so as to be substantially along the vertical direction. (It is provided with a slight inclination in FIG. 3) and is also provided upright on the lower surface of the top surface portion 22.

(Structure-Details of outer cover structure-Guard part-Guard side connecting part)
Returning to FIG. 2, the guard side connecting portion 135 is a connecting means for connecting the first guard side rib 131, the second guard side rib 132, the third guard side rib 133, and the fourth guard side rib 134. The guard side connecting portion 135 is formed of, for example, the same material as the outer cover 20, and as shown in FIGS. 2 and 3, the first guard side rib 131, the second guard side rib 132, and the third guard side rib 132. The guard-side rib 133 and the fourth guard-side rib 134 are connected to the vicinity of the tips thereof.

(Structure-Injection suppression structure)
The incident suppression structure of the fire detection device 1 will be described. FIG. 4 is a sectional view taken along the line BB of FIG. FIG. 5 is an enlarged view around the area C in FIG. Note that, in FIGS. 4 and 5, a straight line L extending leftward from a boundary portion 150 described later is indicated by a dotted line. The fire detection device 1 includes an incident suppression structure for suppressing the incidence of ambient light on the detection space 60, and the characteristics of this incident suppression structure are as described below in the embodiment.

(Structure-Injection Suppression Structure-First Feature)
First, as for the first feature of the incidence suppressing structure, as shown in FIGS. 4 and 5, the light shielding wall 140 is provided.

(Structure-Injection suppression structure-First feature-Shading wall)
The light shielding wall 140 is for suppressing the entry of ambient light through the boundary portion 150 between the detection unit cover 70 and the detection unit main body 80. As shown in FIGS. 4 and 5, the light shielding wall 140 is provided so as to surround the detection unit cover 70 and the detection unit main body 80 inside the outer cover 20, and the first light shielding wall 141 and the second light shielding wall 140 are provided. A wall 142 is provided.

Of these, the first light shielding wall 141 is a part of the basic structure of the light shielding wall 140. The first light shielding wall 141 is formed in a cylindrical shape and is provided on the lower cover 90. Specifically, as shown in FIG. 5, it is arranged so as to protrude downward from the lower cover 90 and surrounds the detection unit cover 70 and the detection unit main body 80. The second light blocking wall 142 is another part of the basic structure of the light blocking wall 140. The second light shielding wall 142 is formed in a cylindrical shape, and is formed on a side portion (a lower side portion of the inner cover 30 in FIG. 5) opposite to the installation surface 2 side of the side portion of the inner cover 30. It is provided. Specifically, as shown in FIG. 5, the inner cover 30 is arranged so as to project upward from the lower side portion thereof, and is arranged so as to surround the detection unit cover 70 and the detection unit main body 80. There is.

Further, although the specific configuration of the light shielding wall 140 is arbitrary, in the embodiment, the boundary portion 150 and the light shielding wall 140 (specifically, the side) as viewed from the direction orthogonal to the installation surface 2 (specifically, the side). Specifically, the first light shielding wall 141 and the second light shielding wall 142) are configured to overlap.

Specifically, the first light shielding wall 141 is configured such that the boundary portion 150 is located closer to the installation surface 2 side (upper side in FIG. 5) than the tip of the first light shielding wall 141. More specifically, the vertical length of the first light shielding wall 141 is set longer than the length from the lower cover 90 to the boundary portion 150. Further, the second light shielding wall 142 is configured such that the boundary portion 150 is located on the side opposite to the installation surface 2 side (the lower side in FIG. 5) with respect to the tip of the second light shielding wall 142. .. More specifically, the vertical length of the second light shielding wall 142 is set to be longer than the length from the lower side portion of the inner cover 30 to the boundary portion 150. With such a configuration, it is possible to prevent the disturbance light from entering the detection space 60 via the boundary portion 150 by the first light shielding wall 141 or the second light shielding wall 142, and to the outside via the boundary portion 150. The emitted internal disturbance light can be suppressed from entering through the boundary portion 150.

With such a first feature, it is possible to prevent the disturbance light from entering the detection space 60 through the boundary portion 150 by the light shielding wall 140, and at the same time, prevent the disturbance light that has exited outside through the boundary portion 150. It is possible to suppress the incidence through the boundary portion 150, and it is possible to maintain the detection accuracy of the fire detection device 1.

(Structure-Injection suppression structure-Second feature)
Next, regarding the second feature of the incidence suppressing structure, the first light blocking member is configured so that the inner cover 30 and the lower cover 90 can be fitted to each other via the first light blocking wall 141 and the second light blocking wall 142. The wall 141 and the second light shielding wall 142 are configured.

Specifically, at least one or more first protrusions (not shown) are provided on the inner side surface of the second light shielding wall 142, and the first light shielding wall 141 is positioned at a portion corresponding to the first protrusion. At least one first notch (not shown) into which the first protrusion can be fitted is provided. Further, at least one second protrusion (not shown) is provided on the outer side surface of the first light shielding wall 141, and the second light shielding wall 142 is positioned at a portion corresponding to the second protrusion on the inner side surface. At least one second notch (not shown) that can fit the second protrusion is provided. However, not limited to this, for example, the first protrusion and the first cutout may be omitted, or the second protrusion and the second cutout may be omitted.

With such a second feature, the inner cover 30 and the lower cover 90 can be fitted to each other via the first light shielding wall 141 and the second light shielding wall 142, and the inner cover 30 and the lower cover 90 are firmly connected. It becomes possible to do.

(Structure-Injection suppression structure-Third feature)
Returning to FIG. 4, next, as to the third feature of the incidence suppressing structure, as shown in FIG. 4, a side portion (in FIG. 4, the inside portion of the inner cover 30) opposite to the side portion on the installation surface 2 side. Of the lower side portion of the cover 30, a peripheral portion of the first opening portion 30a and a side portion of the detecting portion cover 70 opposite to the side portion on the installation surface 2 side (in FIG. 4, the lower portion of the detecting portion cover 70). The detection unit cover 70 and the inner cover 30 are integrally formed so that the peripheral portion of the second opening 70a in the side portion) is continuous.

Specifically, by injection-molding a resin material having a light-shielding property, the peripheral portion of the first opening 30 a of the lower side portion of the inner cover 30 and the lower side portion of the detection unit cover 70 are The periphery of the second opening 70a is formed to be continuous. On the other hand, a portion other than the peripheral portion of the first opening portion 30a in the lower side portion of the inner cover 30 and a portion other than the peripheral portion of the second opening portion 70a in the lower side portion of the detection unit cover 70. Are formed so as to be discontinuous, and the side portions other than the lower side portion of the inner cover 30 and the side portions other than the lower side portion of the detection unit cover 70 are discontinuous. Is formed.

With such a third feature, it is possible to suppress the formation of a gap between the peripheral edge of the first opening 30a in the inner cover 30 and the peripheral edge of the second opening 70a in the detection unit cover 70. It is possible to prevent the ambient light or the ambient light from entering the detection space 60.

(Structure-Injection suppression structure-Fourth feature)
Next, regarding the fourth feature of the incidence suppressing structure, as shown in FIG. 4, the outer diameter of the detection unit cover 70 is set to increase as it approaches the installation surface 2.

Specifically, the inclination angle of the lateral side portion of the side portion of the detection unit cover 70 is set to be about 45 degrees. However, the present invention is not limited to this. For example, the inclination angle of the side portion on the lateral side may be set to an angle that is larger than 45 degrees and smaller than 90 degrees, or the side portion on the lateral side. The inclination angle of the section may be set to a size that is larger than 0 degree and smaller than 45 degrees.

With such a fourth feature, the lateral side portion of the side portion of the detection unit cover 70 can be formed in a tapered shape, and the ambient light or the internal disturbance light incident on the detection unit cover 70 can be effectively attenuated.

(About the action of the fire detection device)
Next, the operation of the fire detection device 1 configured as described above will be described.

That is, for example, when the ambient light is about to enter the detection space 60 through the boundary portion 150 between the detection unit cover 70 and the detection unit main body 80 when the fire detection device 1 is attached to the installation surface 2, Since the incidence of ambient light is blocked by the first light blocking wall 141 or the second light blocking wall 142, the ambient light is suppressed from entering the detection space 60 via the boundary 150.

Further, when the internal disturbing light emitted to the outside through the boundary 150 tries to enter the detection space 60 through the boundary 150, the incident of the internal disturbing light is the first light shielding wall 141 or the second light shielding wall 142. Since the light is shielded by the light, the internal disturbance light is suppressed from entering the detection space 60 via the boundary portion 150.

(Effects of the embodiment)
As described above, according to the embodiment, the accommodating means for accommodating the incidence suppressing means, the accommodating means capable of allowing the gas to flow into and out of the accommodating means, and the incident suppressing means surrounded by the accommodating means. The light-shielding wall 140 provided as described above, the incidence suppressing unit covers the detection space 60, and the detection unit main body 80 provided on the installation surface 2 side of the detection unit cover 70. And a detection part main body 80 that covers another part of the detection space 60, and a boundary part 150 between the detection part cover 70 and the detection part main body 80 and a light shielding wall when viewed from a direction orthogonal to the installation surface 2. Since the light shielding wall 140 is configured so as to overlap with 140, it is possible to prevent the disturbance light from entering the detection space 60 through the boundary portion 150 by the light shielding wall 140, and through the boundary portion 150. It is possible to prevent the internal disturbance light emitted to the outside from entering through the boundary portion 150, and it is possible to maintain the detection accuracy of the fire detection device 1.

Further, the light shielding wall 140 is the first light shielding wall 141 provided on the lower cover 90, and the boundary portion 150 is configured to be located closer to the installation surface 2 side than the tip end of the first light shielding wall 141. Since the first light shielding wall 141 is provided, it is possible to prevent the disturbance light from entering the detection space 60 through the boundary portion 150 by the first light shielding wall 141, and at the same time, the disturbance light is emitted to the outside through the boundary portion 150. Incident light can be suppressed from entering through the boundary portion 150, and the detection accuracy of the fire detection device 1 can be easily maintained.

Further, the light shielding wall 140 is a second light shielding wall 142 provided on a side portion of the inner cover 30 opposite to the installation surface 2 side, and the boundary portion 150 is the second light shielding wall 142. Since the second light shielding wall 142 configured to be located on the side opposite to the installation surface 2 side with respect to the tip of the above is provided, disturbance light enters the detection space 60 via the boundary portion 150 by the second light shielding wall 142. Can be suppressed from entering, and the internal disturbance light emitted to the outside via the boundary part 150 can be suppressed from entering via the boundary part 150, and the detection accuracy of the fire detection device 1 can be easily maintained.

Further, the light blocking wall 140 includes a first light blocking wall 141 provided on the lower cover 90 and a second light blocking wall 142 provided on a side portion of the inner cover 30 opposite to the installation surface 2 side. , And the first light shielding wall 141 and the second light shielding wall 142 are configured such that the inner cover 30 and the lower cover 90 can be fitted to each other via the first light shielding wall 141 and the second light shielding wall 142. Therefore, the inner cover 30 and the lower cover 90 can be fitted to each other through the first light shielding wall 141 and the second light shielding wall 142, and the inner cover 30 and the lower cover 90 can be firmly connected. ..

Further, among the side portions of the inner cover 30 on the side opposite to the installation surface 2 side, the peripheral portion of the first opening 30a and the side portion on the side opposite to the installation surface 2 side of the incident suppressing means. Since the incident suppressing means and the inner cover 30 are integrally formed so that the peripheral edge of the second opening 70a is continuous, the peripheral edge of the first opening 30a in the inner cover 30 and the incident suppressing means. It is possible to suppress the formation of a gap between the second opening 70a and the peripheral part of the second opening 70a, and to suppress the incidence of ambient light or internal light in the detection space 60.

Further, since the outer diameter of the incidence suppressing means is increased as it approaches the installation surface 2, the side portion on the side of the side portion of the incident suppressing means can be formed in a tapered shape, and the disturbance light incident on the incidence suppressing means or Interior light can be effectively attenuated.

[III] Modifications to Embodiments Although the embodiments according to the present invention have been described above, the specific configurations and means of the present invention are within the scope of the technical idea of each invention described in the claims. In, it can be arbitrarily modified and improved. Hereinafter, such a modified example will be described.

(About problems to be solved and effects of the invention)
First, the problem to be solved by the invention and the effect of the invention are not limited to the above-mentioned contents, and may differ depending on the implementation environment of the invention and details of the configuration, and only a part of the above-mentioned problems May be solved, or only some of the effects described above may be achieved.

(Applicable target of fire detection device)
Although the fire detection device 1 is described as a thermological and optical fire detector in the above embodiment, the present invention is not limited to this, and may be, for example, an optical fire detector. In this case, the heat sensing unit 110 and the guard unit 130 can be omitted.

(About storage means)
In the above-mentioned embodiment, although it was described that the housing means includes the inner cover 30, the invention is not limited to this, and the inner cover 30 may be omitted. In this case, the second light shielding wall 142 can be omitted.

(About incident suppression structure)
In the above-described embodiment, the incident suppression structure has been described as including the first light shielding wall 141 and the second light shielding wall 142, but the invention is not limited to this, and for example, the first light shielding wall 141 or the second light shielding wall 142 may be provided. Only one of them may be provided.

Further, in the above-described embodiment, the first light shielding wall 141 and the second light shielding wall 141 are configured so that the inner cover 30 and the lower cover 90 can be fitted to each other via the first light shielding wall 141 and the second light shielding wall 142. Although it has been described that the wall 142 is configured, it is not limited to this. For example, the first light shielding wall 141 and the second light shielding wall 142 are configured such that the inner cover 30 and the lower cover 90 cannot be fitted to each other via the first light shielding wall 141 and the second light shielding wall 142. Good.

Further, in the above-described embodiment, it has been described that the detection unit cover 70 and the inner cover 30 are integrally formed, but the present invention is not limited to this. For example, the detection unit cover 70 and the inner cover 30 are formed separately. May be done.

Further, in the above-described embodiment, it has been described that the outer diameter of the detection unit cover 70 is set to increase as it approaches the installation surface 2, but the present invention is not limited to this and, for example, decreases as it approaches the installation surface 2. It may be set so as to be uniform or may be set uniformly.

(Appendix)
The fire detection device of Appendix 1 is a fire detection device that is attached to the installation surface of an installation target object, is a fire detection device for detecting a fire in a monitoring area, and includes a detection space for detecting a detection target, and An incidence suppressing means for suppressing the incidence of ambient light on the detection space, the incidence suppressing means capable of causing a gas containing the detection target to flow in and out of the incidence suppressing means, and the incidence suppressing means. An accommodating means for accommodating, comprising accommodating means capable of allowing the gas to flow into and out of the accommodating means, and a light shielding wall provided so as to surround the incidence suppressing means inside the accommodating means. The incident suppressing means is a first incident suppressing means that covers a part of the detection space, and a second incident suppressing means that is provided on the installation surface side with respect to the first incident suppressing means. A second incident suppressing means covering another part of the second incident suppressing means, and the light shielding wall and a boundary portion between the first incident suppressing means and the second incident suppressing means when viewed from a direction orthogonal to the installation surface. The light shielding wall was configured so as to overlap.

The fire detection device according to appendix 2 is the fire detection device according to appendix 1, wherein the accommodating unit includes a cover unit that covers a side surface of the incident suppressing unit on the side of the installation surface, and the light shielding wall includes the cover. The first light-shielding wall is provided in the means, and the boundary portion is configured to be located closer to the installation surface side than the tip of the first light-shielding wall.

The fire detection device according to attachment 3 is the fire detection device according to attachment 1 or 2, wherein the housing means includes an inner housing means that houses the incident suppressing means, and an outer housing means that houses the inner housing means. The light-shielding wall is a second light-shielding wall provided on a side portion of the side portion of the inner housing means opposite to the installation surface side, and the boundary portion is the second light-shielding wall. A second light shielding wall configured so as to be located on the side opposite to the installation surface side with respect to the tip of the second light shielding wall.

The fire detection device according to appendix 4 is the fire detection device according to appendix 1, wherein the housing means includes an inner housing means that houses the incidence suppressing means, an outer housing means that houses the inner housing means, and Cover means provided on the installation surface side with respect to the inner housing means, the cover means covering a side surface of the incident suppression means on the installation surface side, and the light shielding wall provided on the cover means. A first light-shielding wall, and a second light-shielding wall provided on a side portion of the inner housing means opposite to the installation surface side, the first light-shielding wall and the second light-shielding wall being provided. The first light shielding wall and the second light shielding wall are configured such that the inner housing means and the cover means can be fitted to each other via a wall.

The fire detection device according to appendix 5 is the fire detection device according to appendix 1, wherein the accommodating means includes an inner accommodating means that accommodates the incident suppressing means, an outer accommodating means that accommodates the inner accommodating means, and A first opening provided on a side opposite to the side on the installation surface side of the side of the inner accommodating means, the gas flowing into the outer accommodating means inside the inner accommodating means. And a second opening provided on a side of the side of the incidence suppressing means opposite to the side on the installation surface side, the inner containing means. A second opening for allowing the gas that has flowed into the inside of the detection space to flow into the detection space, and the first opening of the side of the inner housing means opposite to the side of the installation surface. The incident suppressing means and the peripheral portion of the second opening of the side portion of the side of the incident suppressing means opposite to the side of the installation surface side are continuous. The inner housing means is integrally formed.

Further, in the fire detecting device according to supplementary note 6, in the fire detecting device according to any one of supplementary notes 1 to 5, the outer diameter of the incidence suppressing means is increased as it approaches the installation surface.

(Effect of additional notes)
According to the fire detection device of Supplementary Note 1, the accommodating means for accommodating the incident suppressing means, the accommodating means allowing gas to flow into and out of the accommodating means, and the incident suppressing means inside the accommodating means. A light-shielding wall provided so as to surround the first incidence suppression means, the incidence suppression means covering a part of the detection space, and a second incidence surface provided on the installation surface side of the first incidence suppression means. A second incidence suppressing means that covers the other part of the detection space, and a boundary portion between the first incidence suppressing means and the second incidence suppressing means when viewed from a direction orthogonal to the installation surface. Since the light shielding wall is configured so as to overlap with the light shielding wall, the light shielding wall can prevent the disturbance light from entering the detection space through the boundary portion, and at the same time, can be emitted to the outside through the boundary portion. It is possible to suppress the incident light from entering through the boundary portion, and it is possible to maintain the detection accuracy of the fire detection device.

According to the fire detection device described in appendix 2, the light shielding wall is the first light shielding wall provided in the cover means, and the boundary portion is located closer to the installation surface side than the tip of the first light shielding wall. Since the first light shielding wall configured is provided, it is possible to suppress the disturbance light from entering the detection space through the boundary portion by the first light shielding wall, and at the same time, the disturbance light emitted to the outside through the boundary portion. Can be suppressed from entering through the boundary portion, and the detection accuracy of the fire detection device can be easily maintained.

According to the fire detection device of Supplementary Note 3, the light-shielding wall is the second light-shielding wall provided on a side portion of the side portion of the inner housing means opposite to the installation surface side, and the boundary portion is concerned. Since the second light-shielding wall is provided so as to be located on the side opposite to the installation surface side with respect to the tip of the second light-shielding wall, the second light-shielding wall allows disturbance light to enter the detection space through the boundary portion. It is possible to prevent the incident light from entering through the boundary portion while suppressing the incidence of the incident light to the outside through the boundary portion, and it becomes easier to maintain the detection accuracy of the fire detection device.

According to the fire detection device of appendix 4, the light shielding wall is provided on the first light shielding wall provided on the cover means and on the side portion of the side portion of the inner housing means opposite to the installation surface side. A second light-shielding wall, and the first light-shielding wall and the second light-shielding wall are configured such that the inner housing means and the cover means can be fitted to each other via the first light-shielding wall and the second light-shielding wall. Therefore, the inner housing means and the cover means can be fitted to each other through the first light shielding wall and the second light shielding wall, and the inner housing means and the cover means can be firmly connected to each other.

According to the fire detection device described in appendix 5, the peripheral portion of the first opening of the side portion on the side opposite to the installation surface side of the inner housing means and the installation surface side side portion of the incident suppression means. Since the incident suppressing means and the inner accommodation means are integrally formed so that the peripheral portion of the second opening of the side portion on the opposite side to the inner side is continuous, the peripheral edge of the first opening portion of the inner accommodation means is formed integrally. It is possible to prevent a gap from being formed between the portion and the peripheral portion of the second opening portion in the incidence suppressing means, and it is possible to suppress the incidence of ambient light or ambient light in the detection space.

According to the fire detection device described in appendix 6, since the outer diameter of the incidence suppressing means is increased toward the installation surface, the side portion on the side of the side portion of the incident suppressing means can be formed in a tapered shape, It is possible to effectively attenuate the ambient light or the internal light that has entered the incidence suppressing means.

1 Fire Detection Device 2 Installation Surface 10 Mounting Base 20 Outer Cover 21 Outer Cover Body 22 Top Surface 23 Rib 30 Inner Cover 30a First Opening 40 Inflow Space 50 Insect Respiratory 60 Detection Space 70 Detection Part Cover 70a Second Opening 80 Detecting unit main body 90 Lower cover 91 Mounting member 100 Substrate 110 Heat sensing part 120 Insertion hole 130 Guard part 131 First guard side rib 132 Second guard side rib 133 Third guard side rib 134 Fourth guard side rib 135 Guard side connecting part 140 Light-shielding wall 141 First light-shielding wall 142 Second light-shielding wall 150 Boundary L Straight line protruding from the boundary to the left

Claims (6)

A fire detection device that is attached to the installation surface of an installation target, and is a fire detection device for detecting a fire in a monitoring area,
A detection space for detecting the detection target,
An incidence suppressing means for suppressing the incidence of ambient light on the detection space, the incidence suppressing means capable of causing the gas containing the detection target to flow into and out of the incidence suppressing means,
A housing means for housing the incidence suppressing means, the housing means capable of flowing the gas into and out of the housing means.
A light shielding wall provided so as to surround the incidence suppressing means inside the housing means,
The incident suppression means,
First incidence suppressing means for covering a part of the detection space,
A second incidence suppressing means provided on the installation surface side of the first incidence suppressing means, the second incidence suppressing means covering another part of the detection space,
The light shielding wall is configured such that the light shielding wall overlaps the boundary between the first incidence suppressing unit and the second incidence suppressing unit when viewed from a direction orthogonal to the installation surface.
Fire detection device. The accommodating means is
A cover means for covering a side surface of the incident suppressing means on the side of the installation surface,
The light shielding wall is
A first light shielding wall provided on the cover means, the first light shielding wall being configured such that the boundary portion is located closer to the installation surface side than a tip end of the first light shielding wall,
The fire detection device according to claim 1. The accommodating means is
An inner housing means for housing the incidence suppressing means,
An outer housing means for housing the inner housing means,
The light shielding wall is
It is a 2nd light-shielding wall provided in the side part on the opposite side to the said installation surface side among the side parts of the said inner side accommodation means, Comprising: The said boundary part is the said installation surface side rather than the front-end|tip of the said 2nd light-shielding wall. Has a second light blocking wall configured to be located on the opposite side,
The fire detection device according to claim 1. The accommodating means is
An inner housing means for housing the incidence suppressing means,
Outer housing means for housing the inner housing means,
A cover means provided on the installation surface side with respect to the inner housing means, the cover means covering a side surface of the incident suppression means on the installation surface side,
The light shielding wall is
A first light shielding wall provided on the cover means;
A second light shielding wall provided on a side portion of the side portion of the inner housing means opposite to the installation surface side,
The first light shielding wall and the second light shielding wall are configured such that the inner housing means and the cover means can be fitted to each other via the first light shielding wall and the second light shielding wall,
The fire detection device according to claim 1. The accommodating means is
An inner housing means for housing the incidence suppressing means,
Outer housing means for housing the inner housing means,
A first opening provided on a side portion of the side portion of the inner accommodation means opposite to the side portion on the side of the installation surface, wherein the gas flowing into the outer accommodation means is supplied to the inner accommodation means. A first opening for flowing into the interior,
A second opening provided on a side of the side of the incidence suppressing means opposite to the side on the installation surface side, the gas flowing into the inside accommodating means being detected by the detection space. A second opening for flowing into
Of the side portion on the side opposite to the installation surface side in the inner housing means, the peripheral portion of the first opening and the side portion on the opposite side to the installation surface side side portion of the incidence suppressing means. Of the above, the incidence suppressing means and the inside accommodating means are integrally formed so that the peripheral portion of the second opening is continuous.
The fire detection device according to claim 1. The outer diameter of the incidence suppressing means is increased as it approaches the installation surface,
The fire detection device according to any one of claims 1 to 5.

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