JP7169107B2 - fire detection device - Google Patents

Description

The present invention relates to fire detection devices.

Conventionally, there has been proposed a technique of providing an inflow space for allowing smoke to flow into a detection space inside a smoke sensor for detecting a fire in a monitoring area. In this technique, a labyrinth having a base plate covering the lower surface of the detection space, and a plurality of labyrinth members covering the outer edge of the detection space and standing on the base plate at intervals, A smoke detector main body that covers the upper surface of the detection space, and a cover member provided to cover the labyrinth and the smoke detector main body, the cover member having a plurality of smoke inlets for introducing smoke from the outside. , and an inflow space provided between the labyrinth (specifically, the labyrinth material) inside the cover member and the side wall of the cover member. With such a smoke sensor, the smoke outside the cover member is caused to flow into the inflow space through one of the plurality of smoke inflow ports, and the inflowing smoke flows through the gaps between the labyrinth members. It can flow into the detection space.

Japanese Patent Application Laid-Open No. 2004-220225

Here, in the above conventional technology, as described above, the detection space is covered with a plurality of labyrinth materials. Smoke that has flowed into the inflow space may flow out of the cover member through the smoke inflow port without flowing into the detection space, which may adversely affect smoke detection. Therefore, there is room for improvement from the viewpoint of improving the detection accuracy of a fire detection device such as a smoke sensor.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fire detection device capable of improving the detection accuracy of the fire detection device.

In order to solve the above-described problems and achieve the object, the fire detection device according to claim 1 is a fire detection device for detecting fire in a monitoring area, comprising a detection space for detecting a detection target and an inner accommodation means for accommodating the detection space, the inner accommodation means being capable of causing gas containing the detection target to flow into and out of the inner accommodation means; and an outer accommodation means for accommodating the inner accommodation means. an outer housing means capable of flowing the gas into and out of the outer housing means; and a plurality of ribs provided in a gap between the inner housing means and the outer housing means, By partitioning the gaps with a plurality of ribs, the plurality of inflow spaces for guiding the gas that has flowed into the outer housing means to the gas inflow portion of the inner housing means are formed. The ribs are configured, the plurality of ribs are radially arranged from the center side of the inner housing means toward the outside, some of the plurality of ribs are arranged in a cross shape, and the other ribs of the plurality of ribs are arranged in a cross shape. A part of the ribs was arranged so as not to abut other ribs between the ribs arranged in the cross shape.

The fire detection device according to claim 2 is characterized in that, in the fire detection device according to claim 1, the gas that has flowed into the inflow space partitioned by the ribs arranged in a cross shape directly flows out to another inflow space. The plurality of ribs are configured so that they do not.

According to a third aspect of the present invention, there is provided the fire detection device according to the first or second aspect, wherein the plurality of ribs are formed integrally with the inner housing means or the outer housing means.

According to the fire detection device of claim 1, the gaps are partitioned by the plurality of ribs, thereby forming a plurality of inflow spaces for guiding the gas that has flowed into the outer housing means to the gas inflow portion of the inner housing means. Since the plurality of ribs are formed so that the plurality of inflow spaces allows the gas flowing into the outer containing means to be reliably guided to the gas inflow portion of the inner containing means, the gas flowing into the outer containing means is guided to the inner containing means. Outflow to the outside can be suppressed without flowing into the means. Therefore, it is possible to increase the inflow of gas into the inner housing means and improve the detection accuracy of the fire detection device, compared to the conventional technology (technology in which the detection space is covered with a labyrinth inside the cover member). .
Also, since the plurality of ribs are arranged radially outward from the center side of the inner housing means, it is possible to form a plurality of inflow spaces radially, thereby reducing the directional dependence of the gas flowing into the outer housing means.
Further, since the other part of the plurality of ribs is arranged so as not to abut on other ribs between the ribs arranged in a cross shape, each of the plurality of ribs is arranged so as to abut on the other ribs. As compared with the case of arranging the inner housing means, the pressure of the gas inflow portion of the inner housing means can be suppressed from becoming excessively high, and the inflow of gas into the inner housing means can be easily ensured.

According to the fire detection device of claim 2 , the plurality of ribs are configured so that the gas that has flowed into the inflow space partitioned by the ribs arranged in a cross shape does not directly flow out to other inflow spaces. The gas that has flowed into the inflow space partitioned by the ribs arranged in a cross can be prevented from flowing into other inflow spaces, and the gas that has flowed into the outer housing means can flow out to the outside without flowing into the inner housing means. can be further suppressed.

According to the fire detection device of claim 3, since the plurality of ribs are formed integrally with the inner housing means or the outer housing means, the plurality of ribs can be easily formed, improving the manufacturability of the fire detection device. be able to.

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 of the state which removed the mounting base. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2; It is a perspective view showing an outer cover. It is a perspective view which shows the modification of an outer cover. It is a perspective view which shows the modification of an outer cover. It is a perspective view which shows the modification of an outer cover.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a fire detection device according to the present invention will be described in detail below with reference to the drawings. First, [I] the basic concept of the embodiment will be described, then [II] the specific contents of the embodiment will be described, and finally [III] modifications of the embodiment will be described. However, the present invention is not limited by the embodiment.

[I] Basic concept of the embodiment First, the basic concept of the embodiment will be described. Embodiments generally relate to a fire detection apparatus for detecting fire in a monitored area.

Here, the "fire detection device" is a device that optically detects and reports a fire in the monitored area, and is a concept that includes, for example, an optical fire detector and a fire alarm. . A "monitored area" is an area to be monitored, and is a concept including, for example, an area inside a building, an area outside the building, and the like. In addition, although the specific structure and type of "building" is arbitrary, for example, the concept includes detached houses, collective housing such as apartments and condominiums, office buildings, event facilities, commercial facilities, public facilities, etc. is. In addition, "notify" is a concept including, for example, outputting predetermined information to an external device, displaying or outputting predetermined information via output means (display means or audio output means), etc. be. In the following embodiments, a case where the "fire detection device" is an "optical fire sensor" and the "monitored area" is an "internal area of an office building" will be described.

[II] Specific contents of the 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 how the fire detection device according to the embodiment is mounted. FIG. 2 is a bottom view showing the fire detection device with a mounting base, which will be described later, removed. 3 is a cross-sectional view taken along line AA of FIG. 2. FIG. In the following description, the X direction in FIG. 1 is the horizontal 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 in FIG. 2 is the fire detection device. The front and back direction (+Y direction is the front direction of the fire detection device, -Y direction is the rear direction of the fire detection device), the Z direction in FIG. The direction is referred to as the downward direction of the fire detector). Further, with reference to the detection space described later in FIG. 3, the direction away from the detection space described later will be referred to as "outside", and the direction approaching the detection space described later will be referred to as "inside".

The fire detection device 1 is a device that detects and reports 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. As shown in FIGS. It has an inflow space 40 , an insect screen 50 , a detection space 60 , a detection section cover 70 , a detection section main body 80 , a terminal board 90 and a substrate 100 .

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

(Configuration - outer cover)
The outer cover 20 is outer housing means for housing the inner cover 30 , the inflow space 40 , the insect screen 50 , the detection space 60 , the detection section cover 70 , the detection section main body 80 , the terminal board 90 and the substrate 100 . The outer cover 20 is made of, for example, a light-shielding resin material, and includes an outer cover main body 21 and a ceiling portion 22 as shown in FIGS. 1 to 3 .

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

Also, 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 main body 21 as shown in FIGS. 1 to 3 . Further, as shown in FIG. 2, the top surface portion 22 is provided with a display hole 22a. The display hole 22a is a through hole for guiding light emitted from a display unit, which will be described later, to the outside of the fire detection device 1 through the light guide 104a and the display hole 22a shown in FIG.

(Configuration - 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 (first opening 30a described later) in the inner cover 30. As shown in FIG. In the internal 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 .

(Configuration - inner cover)
The inner cover 30 serves as inner housing means for housing the detection space 60 , the detection section cover 70 , the detection section main body 80 and the substrate 100 , and also serves as partitioning means for partitioning the inflow space 40 . The inner cover 30 is, for example, a substantially hollow cylindrical body with an open upper surface, and is made of a light-shielding resin material. As shown in FIG. 30 is provided so as to face the top surface portion 22 of the outer cover 20 with the inflow space 40 interposed therebetween. Further, as shown in FIG. 3, a first opening 30a is formed in the lower side portion of the inner cover 30. As shown in FIG. The first opening 30a is an opening for sending the gas that has flowed into the inflow space 40 to the detection space 60. As shown in FIG. provided in the vicinity.

(configuration - detection space)
The detection space 60 is a space for detecting a detection target, and as shown in FIG. is formed as

(Construction - detector cover)
The detection unit cover 70 is partitioning means for partitioning the detection space 60 and is incident suppressing means for suppressing disturbance light from entering the detection space 60 . The detector cover 70 is a substantially hollow columnar body with an open upper surface, and is made of a light-blocking resin material. Moreover, as shown in FIG. 3, the detection section cover 70 is located inside the inner cover 30 so that the lower side portion of the detection section cover 70 extends from the top of the outer cover 20 via the first opening 30a 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 in the lower side portion of the detection section cover 70. As shown in FIG. The second opening 70a is an opening for allowing the gas sent from the first opening 30a to flow into the detection space 60. As shown in FIG. It is provided in a portion corresponding to one opening 30a.

(Composition - insect screen)
The insect net 50 is a net for preventing insects outside the fire detection device 1 from entering the detection space 60 . The insect screen 50 is constructed using a mesh-like circular net, and is attached to the detection section cover 70 as shown in FIG.

(Construction - detector body)
The detector main body 80 is mounting means for mounting the detector cover 70 , and is incident suppressing means for suppressing disturbance light from entering the detection space 60 . The detector main body 80 is a thick plate-shaped body (for example, a substantially circular plate-shaped body) made of, for example, a light-shielding resin material, and is closer to the substrate 100 than the detector cover 70 ( 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

(Configuration - terminal board)
The terminal board 90 is housing means for housing the inner cover 30 , the detection section cover 70 , the detection section main body 80 , and the board 100 . The terminal board 90 has a substantially hollow columnar shape with an open lower surface, and is made of, for example, a light-shielding resin material. 3, the terminal board 90 is provided so as to cover the inner cover 30, the detection section cover 70, the detection section main body 80, and the substrate 100 from above, and has a fitting structure with respect to the outer cover 20. etc., and is fixed to the mounting base 10 by a fixture or the like through a first mounting hole (not shown) formed in the mounting member 91 .

(Configuration - substrate)
The substrate 100 is mounting means on which various electric circuits (not shown) are mounted. The board 100 is configured using, for example, a known flat circuit board or the like, and as shown in FIG. It is arranged substantially horizontally and fixed to the terminal board 90 by a fixture through a mounting hole (not shown) formed in the terminal board 90 and a second mounting hole (not shown) formed in the mounting member 91. there is

In addition to mounting known components (electrical components) used in the conventional fire detection device 1 on the substrate 100, the substrate 100 also includes a first light emitting unit, a second light emitting unit, a light receiving unit, a display unit, and a communication device. , a power supply unit, a control unit, and a storage unit (all not shown).

(Configuration - substrate - first light emitting part, second light emitting part, light receiving part)
Among these, the first light emitting section is a first light emitting means for irradiating detection light (hereinafter referred to as "first detection light") into the detection space 60, and is, for example, a known light emitting element (an example of which is an infrared LED). is configured using Further, the second light emitting unit is second light emitting means for irradiating 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"). (Blue LED etc. as an example) is used. Further, the light receiving unit receives scattered light due to smoke of the first detection light emitted from the first light emitting unit, outputs a first light receiving signal according to the received scattered light, and emits light from the second light emitting unit. light receiving means for receiving the scattered light of the second detection light from the smoke and outputting a second light receiving signal corresponding to the received scattered light, for example, using a known light receiving element (such as a photodiode as an example) 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 emitted from the first light emitting unit or the second light emitting unit or the second It is installed so as to prevent the detection light from directly entering the light receiving section through various optical path holes of the detection section main body 80 . For example, the angle between the optical axis of the first light emitting section (hereinafter referred to as "first light emitting side optical axis") and the optical axis of the light receiving section (hereinafter referred to as "light receiving side optical axis") is about 135°. A first light emitting unit and a light receiving unit are installed at the positions. Further, the second light emitting unit and the light receiving unit are installed at a position 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.

(Configuration - board - display part, communication part, power supply part)
The display unit is display means for displaying various information (for example, information indicating whether or not a fire has been detected), and is configured using, for example, known display means (LED, etc.). Although the method of projecting light from the display unit is arbitrary, for example, insertion holes (not shown) provided in each of the inner cover 30, the detection unit cover 70, and the detection unit main body 80 and the display of the outer cover 20 It corresponds to projecting light by guiding the light from the display unit toward the outside of the fire detection device 1 through the light guide 104a inserted through the hole 22a. Also, the communication unit is communication means for communicating with an external device (for example, a receiver, etc.). The power supply unit is power supply means for supplying electric power supplied from a commercial power supply or a battery (not shown) to each unit of the fire detection apparatus 1 .

(Configuration - substrate - control unit, storage unit)
Also, the control unit is control means for controlling the fire detection device 1 . Specifically, this control unit includes a CPU, various programs 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 It is a computer configured with an internal memory such as a RAM for storing various data. The storage unit is storage means for storing programs and various data necessary for the operation of the fire detection device 1 . This storage unit is configured using a rewritable recording medium, and can use, for example, a non-volatile recording medium such as a flash memory.

(Construction - gas inflow structure)
Next, the gas inflow structure will be described. FIG. 4 is a plan view showing the outer cover 20 (partially omitted). Features of the inflow structure for enhancing the inflow of gas into the inner cover 30 are as follows in the embodiment.

(Construction-Gaseous Inflow Structure-First Feature)
First, regarding the first feature of the inflow structure, as shown in FIGS. 3 and 4, first ribs 111 to eighth ribs 118 are provided in the gaps between the inner cover 30 and the outer cover 20. . In the following description, the first rib 111 to the eighth rib 118 are collectively referred to simply as "ribs 110" when there is no particular need to distinguish them.

The first rib 111 to the eighth rib 118 are for partitioning the inflow space 40 . These first ribs 111 to eighth ribs 118 are formed of substantially plate-like bodies, and as shown in FIG. , and connected to the outer cover main body 21 or the top surface portion 22 .

As for the specific configuration of the first rib 111 to the eighth rib 118, in the embodiment, the first rib 111 to the eighth rib 118 partition the gap between the top surface portion 22 and the inner cover 30. Thus, the first rib 111 to the eighth rib 118 are configured such that the eighth inflow space 48 is formed from the first inflow space 41 .

Specifically, first, the shape and size of the first rib 111 to the eighth rib 118 are set as follows. That is, as shown in FIG. 4, the shape of the first rib 111 to the eighth rib 118 is set to be rectangular. Further, the width (length in the horizontal direction) of the first rib 111 to the eighth rib 118 is set to be substantially the same length as the radius of the top surface portion 22 or slightly shorter. Further, the height (length in the vertical direction) of the first rib 111 to the eighth rib 118 is set substantially equal to or shorter than the length in the vertical direction of the inflow space 40 .

As for the method of installing the first rib 111 to the eighth rib 118 , the first rib 111 to the eighth rib 118 are installed (arranged) radially outward from the center side of the inner cover 30 . More specifically, as shown in FIG. 4, first ribs 111 to fourth ribs 114 are arranged in a cross shape. More specifically, the first rib 111 and the third rib 113 are arranged side by side along the front-rear direction and are arranged so as to contact each other, and the second rib 112 and the fourth rib 114 are arranged in the front-rear direction. , and arranged so as to abut on the boundary between the first rib 111 and the third rib 113 . Further, the fifth rib 115 to the eighth rib 118 are arranged between the first rib 111 to the fourth rib 114, respectively. More specifically, a fifth rib 115 is interposed between the first rib 111 and the second rib 112, a sixth rib 116 is interposed between the second rib 112 and the third rib 113, and a A seventh rib 117 is arranged between the third rib 113 and the fourth rib 114 and an eighth rib 118 is arranged between the first rib 111 and the fourth rib 114 . With such an installation method, the inflow space 40 can be partitioned into eight (that is, the first inflow space 41 to the eighth inflow space 48 shown in FIG. 4), and these first inflow space 41 to the eighth inflow space Since 48 can be formed radially, the directional dependence of the gas flowing into the outer cover 20 can be reduced.

With this first feature, the gas that has flowed into the outer cover 20 from the first inflow space 41 through the eighth inflow space 48 can be reliably guided to the gas inflow portion (that is, the first opening 30a) of the inner cover 30. , the gas that has flowed into the outer cover 20 can be prevented from flowing out to the outside without flowing into the inner cover 30 . Therefore, as compared with the conventional technology (technology in which the detection space is covered with a labyrinth inside the cover member), the inflow of gas into the inner cover 30 can be increased, and the detection accuracy of the fire detection device 1 can be improved. can.

(Construction-Gaseous Inflow Structure-Second Feature)
Next, as for the second feature of the inflow structure, the first rib 111 to the eighth rib 118 is separated from the first rib 111 to the eighth rib 118 so that some of the ribs 110 out of the first rib 111 to the eighth rib 118 do not come into contact with other ribs 110 . are placed.

Specifically, as shown in FIG. 4, the fifth to eighth ribs 115 to 118 are in contact with the other ribs 110 between the first to fourth ribs 111 to 114 arranged in a cross shape. are arranged so as not to More specifically, the fifth rib 115 is spaced from the adjacent first rib 111 and second rib 112 , and the sixth rib 116 is spaced from the adjacent second rib 112 and third rib 113 . The seventh rib 117 is spaced from the adjacent third rib 113 and fourth rib 114, and the eighth rib 118 is spaced from the adjacent first rib 111 and fourth rib 114. It is In this case, for example, as shown in FIG. 4, the width of each of the fifth to eighth ribs 115 to 118 is set shorter than the width of each of the first to eighth ribs 111 to 118 .

Due to such a second feature, the pressure at the gas inflow portion of the inner cover 30 is excessively high compared to when each of the first rib 111 to the eighth rib 118 is arranged to abut on the other ribs 110. This makes it easier to ensure the inflow of gas to the inner cover 30 .

(Configuration-Gaseous inflow structure-Third feature)
Returning to FIG. 3, next, regarding the third feature of the inflow structure, as shown in FIGS. From the rib 111 to the inflow space partitioned by the fourth rib 114 (for example, as shown in FIG. 4, the first inflow space 41 and the second inflow space 42 partitioned by the first rib 111 and the second rib 112, etc.) The first rib 111 to the eighth rib 118 are configured so that the inflowing gas does not directly flow out to other inflow spaces.

Specifically, first, the height of the first rib 111 to the fourth rib 114 is set substantially equal to the vertical length of the inflow space 40 . Further, the upper end of each of the first rib 111 to the fourth rib 114 contacts the lower side of the inner cover 30 , and the lower end of each of the first rib 111 to the fourth rib 114 contacts the top of the outer cover 20 . A first rib 111 to a fourth rib 114 are arranged so as to be in contact with the face portion 22 .

With this third feature, it is possible to prevent the gas that has flowed into the inflow space partitioned by the first rib 111 from the fourth rib 114 from flowing into another inflow space (for example, the first inflow space 41 or the second inflow space). The gas that has flowed into the second inflow space 42 can be prevented from flowing into the eighth inflow space 48), and the flow of the gas that has flowed into the outer cover 20 to the outside without flowing into the inner cover 30 can be further suppressed.

In this case, the specific configuration of the fifth rib 115 to the eighth rib 118 is arbitrary, but in the embodiment, they are configured substantially in the same manner as the first rib 111 to the fourth rib 114 described above. there is That is, the height from the fifth rib 115 to the eighth rib 118 is set substantially equal to the vertical length of the inflow space 40 . Further, the upper end portions of the fifth rib 115 to the eighth rib 118 are in contact with the lower side portion of the inner cover 30 , and the lower end portions of the fifth rib 115 to the eighth rib 118 are in contact with the top portion of the outer cover 20 . A fifth rib 115 to an eighth rib 118 are arranged so as to be in contact with the face portion 22 . However, the height from the fifth rib 115 to the eighth rib 118 may be set shorter than the length of the inflow space 40 in the vertical direction. Alternatively, the fifth ribs 115 to the eighth ribs 115 to the eighth ribs 115 to the eighth ribs 115 may be separated from each other so that the upper end portion or the lower end portion of each of the fifth ribs 115 to the eighth ribs 118 does not contact the lower side portion of the inner cover 30 or the top surface portion 22 of the outer cover 20 . Ribs 118 may be positioned.

(Configuration-Gaseous Inflow Structure-Fourth Feature)
Next, as for the fourth feature of the inflow structure, the first rib 111 to the eighth rib 118 are formed integrally with the inner cover 30 or the outer cover 20. Specifically, as shown in FIG. , the first rib 111 to the eighth rib 118 are formed integrally with the outer cover 20 . Here, the method of integrally forming the first rib 111 to the eighth rib 118 and the outer cover 20 is arbitrary, but for example, they may be formed by injection molding a light-blocking resin material.

With such a fourth feature, the first rib 111 to the eighth rib 118 can be easily formed, and the manufacturability of the fire detection device 1 can be improved.

(About the action of the fire detection device)
Next, the operation of the fire detection device 1 configured in this manner will be described.

That is, for example, when gas containing smoke caused by a fire tries to flow into the outer cover 20, the gas that has flowed from the first inflow space 41 to at least one of the eighth inflow spaces 48 will flow into the first inflow space 41. to the first opening 30a of the inner cover 30 by any one of the eighth inflow space 48, the gas that has flowed into the outer cover 20 can be prevented from flowing out without flowing into the inner cover 30, The inflow of gas to the inner cover 30 can be enhanced. In particular, since the first to eighth inflow spaces 41 to 48 are radially formed by the first to eighth ribs 111 to 118, the directional dependence of the gas flowing into the outer cover 20 can be reduced. In addition, the inflow space partitioned by the first ribs 111 to the fourth ribs 114 arranged in a cross shape (for example, the first inflow space 41 and the second inflow space 42 partitioned by the first rib 111 and the second rib 112). etc. ) does not directly flow out to other inflow spaces, the first rib 111 to the eighth rib 118 are configured so that the gas that has flowed into the outer cover 20 does not flow into the inner cover 30 . Outflow to the outside can be suppressed. Furthermore, even if the gas is simultaneously guided by at least two or more of the first inflow space 41 to the eighth inflow space 48 , the fifth rib 115 to the eighth rib 118 and the other ribs 110 Since they are arranged so as not to come into contact with each other, it is possible to prevent the pressure of the gas in the first opening 30a of the inner cover 30 from becoming excessively high, and to ensure the inflow of gas into the inner cover 30 .

(Effect of Embodiment)
In this way, according to the embodiment, the plurality of ribs 110 divide the gaps from the first inflow space 41 for guiding the gas that has flowed into the outer cover 20 to the gas inflow portion of the inner cover 30 . Since the plurality of ribs 110 are formed to form eight inflow spaces 48 , the gas that has flowed into the outer cover 20 from the first inflow space 41 through the eighth inflow space 48 is reliably transferred to the gas inflow portion of the inner cover 30 . , and the gas that has flowed into the outer cover 20 can be prevented from flowing out to the outside without flowing into the inner cover 30 . Therefore, as compared with the conventional technology (technology in which the detection space is covered with a labyrinth inside the cover member), the inflow of gas into the inner cover 30 can be increased, and the detection accuracy of the fire detection device 1 can be improved. can.

In addition, since the plurality of ribs 110 are radially arranged from the center side of the inner cover 30 toward the outside, the eighth inflow space 48 can be radially formed from the first inflow space 41, and the gas flowing into the outer cover 20 can be prevented. Directional dependence can be reduced.

In addition, since the other part of the plurality of ribs 110 is arranged so as not to abut on the other ribs 110 between the ribs 110 arranged in a cross shape, each of the plurality of ribs 110 can be placed between the other ribs. Compared to the case where the inner cover 30 is arranged so as to abut on the inner cover 30 , excessively high pressure at the gas inflow portion can be suppressed, and the inflow of gas into the inner cover 30 can be easily ensured.

In addition, since the plurality of ribs 110 are configured so that the gas that has flowed into the inflow space partitioned by the ribs 110 arranged in a cross shape does not directly flow out to other inflow spaces, the ribs 110 arranged in a cross shape The gas that has flowed into the partitioned inflow space can be prevented from flowing into another inflow space, and the gas that has flowed into the outer cover 20 can be further suppressed from flowing out to the outside without flowing into the inner cover 30. - 特許庁

Further, since the plurality of ribs 110 are arranged so that some ribs 110 out of the plurality of ribs 110 do not come into contact with other ribs 110, each of the plurality of ribs 110 comes into contact with the other ribs 110. Compared to the arrangement, the pressure of the gas inflow portion of the inner cover 30 can be suppressed from becoming excessively high, and the inflow of gas into the inner cover 30 can be easily ensured.

Moreover, since the plurality of ribs 110 are formed integrally with the outer cover 20, the plurality of ribs 110 can be formed easily, and the manufacturability of the fire detection device 1 can be improved.

[III] Modifications to the Embodiments Although the embodiments according to the present invention have been described above, specific configurations and means of the present invention are within the scope of the technical ideas of each invention described in the claims. In can be optionally modified and improved. Such modifications will be described below.

(Problem to be solved and effect of invention)
First, the problems to be solved by the invention and the effects of the invention are not limited to the contents described above, and may differ depending on the details of the implementation environment and configuration of the invention. or only part of the effects described above.

(Regarding gas inflow structure)
In the above embodiment, the gas inflow structure is applied to the fire detection device 1 in which the detection space 60 and the inflow space 40 are vertically arranged side by side. It may be applied to the fire detection device 1 in which the detection space 60 and the inflow space 40 are horizontally arranged side by side.

(About ribs)
In the above embodiment, the number of ribs 110 installed is eight, but the number is not limited to this, and may be, for example, two or more and less than eight, or may be nine or more. .

Further, in the above-described embodiment, the first rib 111 to the fourth rib 114 are provided. You may Further, in the above embodiment, the fifth rib 115 to the eighth rib 118 are provided. You may

Further, in the above-described embodiment, it has been described that a part of the first rib 111 to the eighth rib 118 is arranged so as not to contact the other ribs 110, but the present invention is not limited to this. 5 and 6 are perspective views showing modifications of the outer cover 20. FIG. For example, as shown in FIGS. 5 and 6 , all of the first rib 111 to the eighth rib 118 may be arranged so as not to contact the other ribs 110 . As a result, compared to the case where each of the plurality of ribs 110 is arranged to abut on the other ribs 110, it is possible to prevent the pressure of the gas inflow portion of the inner cover 30 from becoming excessively high. It becomes easy to secure the influx of gas.

Further, in the above-described embodiment, it has been described that a part of the first rib 111 to the eighth rib 118 is arranged so as to be in contact with the other rib 110, but the present invention is not limited to this. FIG. 7 is a perspective view showing a modification of the outer cover 20. As shown in FIG. For example, as shown in FIG. 7, all of the first rib 111 to the eighth rib 118 may be arranged so as to abut on the other ribs 110 .

Further, in the above embodiment, the first rib 111 to the eighth rib 118 are configured so that the gas that has flowed into the inflow space partitioned by the fourth rib 114 from the first rib 111 does not directly flow out to another inflow space. Although it has been explained that it is, it is not limited to this. For example, from the first rib 111, the gas flowing into the inflow space partitioned by the fourth rib 114 directly flows out to another inflow space (however, the amount of outflow is very small). An eighth rib 118 may be configured (that is, may be configured such that a gap is formed between the rib 110 and the lower side portion of the inner cover 30 or the top surface portion 22 of the outer cover 20). . In this case, the height from the first rib 111 to the fourth rib 114 may be set shorter than the vertical length of the inflow space 40 . Alternatively, the first ribs 111 to the fourth ribs 111 to the fourth ribs 111 to the fourth ribs 111 to 114 may be separated from each other so that the upper end portion or the lower end portion of each of the first ribs 111 to the fourth ribs 114 does not contact the lower side portion of the inner cover 30 or the top surface portion 22 of the outer cover 20 . Ribs 114 may be positioned.

Moreover, although the said embodiment demonstrated that the 1st rib 111 to the 8th rib 118 were integrally formed with the outer cover 20, it does not restrict to this. For example, the first rib 111 to the eighth rib 118 may be formed integrally with the inner cover 30 . Alternatively, a part of the first rib 111 to the eighth rib 118 is formed integrally with either the outer cover 20 or the inner cover 30, and the other part of the first rib 111 to the eighth rib 118 is formed on the outer cover. It may be formed integrally with either the cover 20 or the inner cover 30 . Alternatively, the first rib 111 to the eighth rib 118 may be formed separately from the outer cover 20 .

(Appendix)
The fire detection device of Supplementary Note 1 is a fire detection device for detecting a fire in a monitoring area, and includes a detection space for detecting a detection target, and inner housing means for housing the detection space, wherein the detection target and an outer accommodation means for accommodating the inner accommodation means, wherein the gas is allowed to flow into and out of the outer accommodation means. An outer housing means and a plurality of ribs provided in a gap between the inner housing means and the outer housing means are provided. The plurality of ribs are configured to form a plurality of inflow spaces for guiding the inflowing gas to the gas inflow portion of the inner housing means.

Further, in the fire detection device according to Appendix 2, in the fire detection device according to Appendix 1, the plurality of ribs are arranged radially outward from the center side of the inner housing means.

Further, the fire detection device according to Supplementary Note 3 is the fire detection device according to Supplementary Note 2, wherein some of the plurality of ribs are arranged in a cross shape, and other portions of the plurality of ribs are arranged in the cross shape. The ribs were arranged so as not to come into contact with other ribs between the arranged ribs.

Further, in the fire detection device according to appendix 4, in the fire detection device according to appendix 3, the gas that has flowed into the inflow space partitioned by the ribs arranged in a cross shape is prevented from flowing out to other inflow spaces. , comprising said plurality of ribs.

Further, in the fire detection device according to Appendix 5, in the fire detection device according to Appendix 1 or 2, the plurality of ribs are arranged such that at least some of the plurality of ribs do not come into contact with other ribs. did.

Further, in the fire detection device according to Appendix 6, in the fire detection device according to any one of Appendixes 1 to 5, the plurality of ribs are integrally formed with the inner housing means or the outer housing means.

(Effect of Supplementary Note)
According to the fire detection device described in appendix 1, the gaps are partitioned by the plurality of ribs, thereby forming a plurality of inflow spaces for guiding the gas that has flowed into the outer housing means to the gas inflow portion of the inner housing means. Since the plurality of ribs are configured as described above, the gas that has flowed into the outer housing means can be reliably guided to the gas inflow portion of the inner housing means by the plurality of inflow spaces. can be suppressed from flowing out to the outside without flowing into. Therefore, it is possible to increase the inflow of gas into the inner housing means and improve the detection accuracy of the fire detection device, compared to the conventional technology (technology in which the detection space is covered with a labyrinth inside the cover member). .

According to the fire detection device described in Supplementary Note 2, since the plurality of ribs are radially arranged from the center side of the inner housing means toward the outside, the plurality of inflow spaces can be formed radially and flow into the outer housing means. The directional dependence of the gas can be reduced.

According to the fire detection device described in Supplementary Note 3, since the other part of the plurality of ribs is arranged so as not to contact other ribs between the ribs arranged in a cross shape, the plurality of ribs are arranged so as to abut against other ribs, the pressure of the gas inflow portion of the inner housing means can be suppressed from becoming excessively high, and the inflow of gas into the inner housing means can be ensured. easier.

According to the fire detection device described in appendix 4, the plurality of ribs are configured so that the gas that has flowed into the inflow space partitioned by the ribs arranged in a cross shape does not flow out to other inflow spaces. It is possible to prevent the gas that has flowed into the inflow space partitioned by the ribs from flowing into the other inflow space, and to prevent the gas that has flowed into the outer housing means from flowing out to the outside without flowing into the inner housing means. can be further suppressed.

According to the fire detection device described in Supplementary Note 5, the plurality of ribs are arranged so that at least some of the plurality of ribs do not come into contact with other ribs. As compared with the case of arranging so as to abut on the inner housing means, it is possible to prevent the pressure of the gas inflow portion of the inner housing means from becoming excessively high, thereby making it easier to ensure the inflow of gas into the inner housing means.

According to the fire detection device described in appendix 6, since the plurality of ribs are formed integrally with the inner housing means or the outer housing means, the plurality of ribs can be easily formed, improving the manufacturability of the fire detection device. can be done.

Reference Signs List 1 fire detection device 2 installation surface 10 mounting base 20 outer cover 21 outer cover body 22 top surface 22a display hole 30 inner cover 30a first opening 40 inflow space 41 first inflow space 42 second inflow space 43 third inflow space 44 Fourth inflow space 45 Fifth inflow space 46 Sixth inflow space 47 Seventh inflow space 48 Eighth inflow space 50 Insect screen 60 Detection space 70 Detection part cover 70a Second opening 80 Detection part body 90 Terminal board 91 Mounting member 100 Substrate 104a Light guide 110 Rib 111 First rib 112 Second rib 113 Third rib 114 Fourth rib 115 Fifth rib 116 Sixth rib 117 Seventh rib 118 Eighth rib

Claims (3)

A fire detection device for detecting fire in a monitored area, comprising:
a detection space for detecting a detection target;
an inner accommodation means for accommodating the detection space, the inner accommodation means being capable of allowing the gas containing the detection target to flow into and out of the inner accommodation means;
an outer accommodation means for accommodating the inner accommodation means, the outer accommodation means being capable of allowing the gas to flow into and out of the outer accommodation means;
a plurality of ribs provided in a gap between the inner housing means and the outer housing means;
The gaps are partitioned by the plurality of ribs so that a plurality of inflow spaces for guiding the gas that has flowed into the outer housing means to the gas inflow portion of the inner housing means are formed. constitute the ribs of
The plurality of ribs are arranged radially outward from the center side of the inner housing means,
Some of the plurality of ribs are arranged in a cross shape,
Another part of the plurality of ribs is arranged so as not to contact other ribs between the ribs arranged in the cross shape,
Fire detection device. The plurality of ribs are configured so that the gas that has flowed into the inflow space partitioned by the cross-shaped ribs does not directly flow out to another inflow space,
A fire detection device according to claim 1. wherein the plurality of ribs are integrally formed with the inner housing means or the outer housing means;
The fire detection device according to claim 1 or 2 .

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