JP7080030B2 - sensor - Google Patents

Description

The present invention relates to a sensor in which a structure such as a battery accommodating portion is arranged in a housing.

In a conventional detector, for example, a smoke detector, there is a case in which a long structure such as a battery accommodating portion is arranged side by side with a detection portion for detecting smoke in a housing having an opening. In such a smoke detector, the large projection surface of the structure may block the exposure of the detection section to the opening, deteriorating the inflow characteristics of the smoke into the detection section. Therefore, there is a smoke detector in which the structure is arranged so that the long direction of the structure is the direction from the side wall of the housing toward the detection portion (see, for example, Patent Document 1). In Patent Document 1, the structure and the detection unit are arranged adjacent to each other, and the structure itself is used as a guiding member for guiding air containing smoke. Further, a plurality of guide plates are provided from the opening which is the smoke flow inlet toward the detection portion.

Japanese Patent No. 5124327 (for example, FIG. 13)

In the smoke detector of FIG. 13 of Patent Document 1, the area where the opening is blocked by the structure can be reduced. On the other hand, a plurality of guide plates and structures are connected to the detection unit in order to collect smoke in the detection unit, and the space inside the housing is divided. Therefore, it becomes difficult for air to blow through the inside of the housing, and as a result, it becomes difficult for smoke to flow into the housing. Therefore, in the conventional smoke detector, for example, air containing low flow velocity smoke generated in the initial stage of a fire cannot flow into the detection unit because it is difficult to blow through in the housing, and the detection of the fire may be delayed.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a sensor having good inflow characteristics into a housing.

The detector of the present invention has an opening, and a housing in which a flow space through which air flowing in from the opening flows is formed, and detection for detecting smoke or heat from the air flowing in from the flow space. A portion, an inflow portion arranged in the distribution space and communicating the distribution space and the detection portion, and a long shape so that the elongated direction extends from the outer periphery of the housing to the inflow portion. A structure arranged in the flow space with a gap from the inflow portion, and a rib arranged in the flow space so as to have a gap with the inflow portion and extending along the elongated direction of the structure. , The inflow portion is arranged so as to enter the direct inflow region in which the region formed by the long side surface of the structure and the ribs is extended toward the inflow portion side, and the length in the structure. The distance between the side surface in the length direction and the rib is constant in the length direction of the structure.
Further, another sensor of the present invention has an opening, and smoke or heat is emitted from the housing in which the flow space through which the air flowing in from the opening flows is formed, and the air flowing in from the flow space. It has a detection unit to be detected, an inflow portion arranged in the distribution space and communicating the distribution space and the detection unit, and a long shape, and the long direction extends from the outer periphery of the housing to the inflow portion. As described above, a structure arranged in the flow space with a gap from the inflow portion and a structure arranged in the flow space so as to have a gap with the inflow portion are arranged along the longitudinal direction of the structure. The inflow portion comprises a pair of ribs extending on both sides of the structure, the inflow portion comprising a region formed by each rib and an elongated side surface of the structure facing the rib. The pair of ribs are arranged so as to enter the direct inflow region extending toward the portion, and the distance between the ends of the pair of ribs on the inflow portion side is larger than the width of the inflow portion. ing.

According to the present invention, it is possible to provide a sensor having good inflow characteristics into the housing even when a long structure is arranged on the flow path.

It is a figure which shows the appearance of the smoke detector 100 which concerns on Embodiment 1. FIG. It is an exploded perspective view of each configuration of a smoke detector 100. It is sectional drawing which shows the AA cross section of FIG. It is a schematic diagram which shows the base part which accommodated a substrate and a speaker. It is sectional drawing which shows the BB cross section of FIG. It is a schematic diagram which shows the structure of a distribution space SP1. It is a schematic diagram which shows the structure of the distribution space SP1 of the smoke detector 300 which concerns on Embodiment 2. FIG. It is sectional drawing which shows the CC cross section of FIG.

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

FIG. 1 is a diagram showing the appearance of the smoke detector 100 according to the first embodiment. FIG. 1A is a side view showing the appearance of the smoke detector 100, and FIG. 1B is a bottom view showing the appearance of the smoke detector 100. FIG. 2 is an exploded perspective view of each configuration of the smoke detector 100. FIG. 3 is a cross-sectional view showing a cross section taken along the line AA of FIG. FIG. 4 is a schematic view showing a base portion 7 accommodating a substrate 3 and a speaker 5. FIG. 5 is a cross-sectional view showing a BB cross section of FIG. The configuration of the smoke detector 100 will be described with reference to FIGS. 1 to 5.

The smoke detector 100 is installed in a monitoring space such as the room of a house, constantly monitors the smoke concentration in the air, and outputs that the smoke concentration exceeds a certain value as an electric signal or the like. The smoke detector 100 is attached to, for example, the ceiling 200. As shown in FIGS. 1 and 2, the smoke detector 100 has a housing 10 having an opening 1 that serves as a smoke inflow inlet, and a detection unit 9 that detects smoke in the air that has flowed into the housing 10. (See FIG. 4) and an inflow unit 2 and the like connected to the detection unit 9. Further, the smoke detector 100 includes a substrate 3 having a light emitting unit 3A and the like, a battery 4, a speaker 5, and a partition member 6. In the housing 10, the battery 4, the base portion 7 of the partition member 6, the substrate 3, the speaker 5, the detection unit 9, the lid portion 8 of the partition member 6, and the inflow portion 2 are arranged in this order from above to below.

As shown in FIG. 1, the housing 10 of the smoke detector 100 includes a bottomed tubular first cover 11 and a second cover 12 that serves as a lid for the first cover 11. The first cover 11 is attached to the second cover 12, and the second cover 12 is fixed to the ceiling 200 by screws or the like. The first cover 11 has a flat plate-shaped bottom surface portion 11A and a cylindrical side surface portion 11B. A mounting hole 11A1 is formed in the bottom surface portion 11A, and a pushing member 16 is arranged in the mounting hole 11A1. The push member 16 is used, for example, as an inspection button pressed by an operator when starting an operation test of the smoke detector 100.

An opening 1 extending in the circumferential direction is formed between the side surface portion 11B and the bottom surface portion 11A. The side surface portion 11B is provided between a tubular portion 13 detachably fixed to the second cover 12, a plurality of main columns 14 extending in the vertical direction (arrow Z direction), and adjacent main columns 14. It has a plurality of auxiliary columns 15 and a ring-shaped partition member 1A that partitions the opening 1. The tubular portion 13 has a shape surrounding the partition member 6, and is formed in, for example, a cylindrical shape. The main column 14 supports the bottom surface portion 11A. The sub-post 15 is thinner than the main strut 14 and supports the partition member 1A. The opening 1 is divided into two stages by a ring-shaped partition member 1A. The position where the opening 1 is formed is not limited to the outer periphery of the first cover 11. The opening 1 may be formed in, for example, the bottom surface portion 11A.

A distribution space SP1 which is an air passage from the opening 1 to the inflow portion 2 is formed in the housing 10. When smoke is generated in the monitoring space, the air containing smoke flows into the housing 10 through the opening 1, passes through the distribution space SP1, and flows out of the housing 10 again from the opening 1. ..

As shown in FIGS. 2 and 3, the inflow portion 2 is installed in the distribution space SP1 below the partition member 6 through which air flows. The inflow unit 2 causes the air that has flowed in from the opening 1 to flow into the detection unit 9. In the horizontal direction (arrow Y direction), the center O2 of the inflow portion 2 is eccentric from the center O1 of the housing 10, and the distance between the outer circumference of the inflow portion 2 and the outer circumference of the housing 10 is not in the circumferential direction of the inflow portion 2. It is uniform.

As shown in FIGS. 3 and 5, the inflow portion 2 has an optical table cover 21 and a labyrinth wall 22 housed in the optical table cover 21 and having a light-shielding function. The optical table cover 21 is a bowl-shaped member, and includes a lid-shaped portion 21A at the bottom and a cylindrical net portion 21B having a plurality of holes through which air passes. The net unit 21B prevents dust or insects from entering the inflow unit 2. The lid-shaped portion 21A and the net portion 21B of the optical table cover 21 also have a light-shielding function like the labyrinth wall 22. The labyrinth wall 22 is formed on the lid portion 8 of the partition member 6.

As shown in FIGS. 3 and 4, the substrate 3 receives the light of the light emitting unit 3A that emits light, the switch 3B that detects that the pressing member 16 is pressed, and the light emitting unit 3A scattered by smoke. Electronic components such as the light receiving unit 3C are mounted. The light emitting unit 3A is composed of, for example, an LED or the like. Further, the substrate 3 is formed with an optical system arrangement portion 3D having a part cut out from the edge. The light emitting unit 3A and the light receiving unit 3C are each on the upper surface 31 of the substrate 3 and are arranged on the edge of the optical system arrangement unit 3D. On the other hand, the switch 3B is arranged on the lower surface of the substrate 3. The battery 4 supplies the operating power of various circuits provided on the substrate 3. Although the scattered light method has been described, smoke may be detected by the dimming method.

As shown in FIG. 4, the speaker 5 is arranged side by side with the substrate 3 in the horizontal direction (arrow X direction). The speaker 5 includes a diaphragm or the like that generates sound by vibration, and is electrically connected to the substrate 3. When smoke is detected and a signal is input from the circuit of the substrate 3 to the speaker 5, the speaker 5 vibrates the diaphragm and generates a sound. The configuration in which the speaker 5 is provided in the housing 10 of the smoke detector 100 and the speaker 5 is used for notification has been described. However, the smoke detector 100 transmits an electric signal to a separate receiver or the like, and the receiver or the like. It may be notified by.

As shown in FIGS. 2 to 5, the partition member 6 includes a base portion 7 arranged on the second cover 12 side and a lid portion 8 arranged on the first cover 11 side, and the housing 10 is provided. The space inside is divided into upper and lower parts, and the substrate 3, the battery 4, and the speaker 5 are accommodated. The base portion 7 has a smoke detection wall portion 7A forming a detection space 7A1 for smoke detection on a base lower surface 71 facing the lid portion 8, a speaker accommodating portion 7B forming a space in which the speaker 5 is accommodated, and the base portion 7. It has a substrate accommodating portion 7C or the like that forms a space in which the substrate 3 is accommodated.

The smoke detection wall portion 7A is a wall portion protruding toward the lid portion 8, and a part of the outer surface is fitted with the optical system arrangement portion 3D of the substrate 3. The smoke detection wall 7A has a hole 7A2 facing the light emitting part 3A for smoke detection, a hole 7A3 facing the light receiving part 3C for smoke detection, and the light of the light emitting part 3A directly to the light receiving part 3C in normal times. It is provided with a protrusion 7A4 to prevent entry. The speaker accommodating portion 7B is an arc-shaped wall portion that protrudes toward the lid portion 8 and surrounds the outer surface of the speaker 5. The substrate accommodating portion 7C is a wall portion that protrudes toward the lid portion 8 and is provided so as to face the edge of the substrate 3.

Here, the detection unit 9 is formed by the smoke detection wall portion 7A described above, the light emitting portion 3A mounted on the substrate 3, the light receiving portion 3C, and the like. The detection unit 9 irradiates the air flowing into the detection space 7A1 from the opening 1 of the smoke detector 100 through the inflow unit 2, and detects the smoke in the air by detecting the received scattered light. The light generated by the light emitting unit 3A is incident on the detection space 7A1 through the hole portion 7A2, is scattered by the smoke in the detection space 7A1, and is incident on the light receiving unit 3C from the hole portion 7A3. The detection unit 9 may be configured to detect heat, smoke, or the like generated by a fire, and may be configured to detect a physical quantity or a physical change according to the object to be detected.

Further, the base portion 7 has a long battery accommodating portion 7D forming a space for accommodating the battery 4 on the upper surface 72 of the base facing the second cover 12. In the battery accommodating portion 7D, the cylindrical battery 4 is accommodated so that the axial direction, which is the long direction of the battery 4, is the horizontal direction (arrow Y direction). Further, the above-mentioned inflow portion 2 is arranged on the extension of the battery accommodating portion 7D in the long direction. As shown in FIG. 3, the battery accommodating portion 7D is provided so that the axis of the accommodating battery 4 is located on a straight line passing through the center O1 of the housing 10 and the center O2 of the inflow portion 2.

As shown in FIGS. 2, 3 and 5, the battery accommodating portion 7D has a concave shape on the upper surface 72 side of the base along the outer shape of the battery 4, whereby the lower surface 71 side of the base has a raised shape. .. The battery accommodating portion 7D has a long cylindrical side surface 7D1 extending in the long direction and having a notch for inserting the battery 4 in a part of the outer circumference, and a flat plate shape provided at one end of the long side surface 7D1. It has a first end surface 7D2 and a curved second end surface 7D3 provided at the other end. The first end surface 7D2 has a flat plate shape and faces the net unit 21B, which is the outer surface of the inflow unit 2, with a gap G1.

Here, the size of the gap G1 between the first end surface 7D2 and the net unit 21B is preferably about half the height H1 of the inflow portion 2. For example, if the height H1 of the inflow portion 2 is 14 mm, the gap G1 is 4 mm to 10 mm. In this case, if the gap G1 is smaller than 4 mm, resistance is generated as in a conventional smoke detector, and the inflow property into the housing 10 is deteriorated. Further, when the gap G1 is larger than 10 mm, most of the air flowing into the housing 10 flows out through the gap G1, and the inflow property into the inflow portion 2 deteriorates.

The second end surface 7D3 is curved, and is formed so that the gap between the second end surface 7D3 and the battery 4 increases toward the upper side of the upper surface 72 of the base. This makes it easy to replace the battery 4. The width W1 of the battery accommodating portion 7D in the short direction (arrow X direction) is smaller than the width W2 of the inflow portion 2. As a result, the area where the flow passage from the opening 1 to the inflow portion 2 is blocked by the battery accommodating portion 7D can be suppressed to a small size.

As shown in FIGS. 3 and 5, the lid portion 8 includes a lid bottom surface 8A and a flange portion 8B provided on the edge of the lid bottom surface 8A. The lid portion 8 is arranged below the base portion 7 in which the substrate 3 and the speaker 5 are housed. Specifically, the lid portion 8 covers the smoke detection wall portion 7A, the speaker accommodating portion 7B, and the substrate accommodating portion 7C. On the other hand, on the lower surface 71 of the base, the sides of the battery accommodating portion 7D and the long side surface 7D1 of the battery accommodating portion 7D are exposed to the distribution space SP1.

A speaker hole 8A1 is formed on the bottom surface 8A of the lid at a position facing the diaphragm of the speaker 5, and the sound wave generated by the speaker 5 propagates through the speaker hole 8A1 to the opening 1 of the first cover 11. Will be done. Further, the lid bottom surface 8A has a switch hole 8A2 through which the switch 3B installed on the substrate 3 penetrates, and a through hole 8A3 in which the inflow portion 2 and the detection space 7A1 communicate with each other. The switch hole 8A2 is provided above the position where the mounting hole 11A1 of the first cover 11 is provided.

FIG. 6 is a schematic view showing the structure of the distribution space SP1. Next, the flow of air containing smoke and the operation of the smoke detector 100 will be described with reference to FIG. When a fire or the like occurs, the air F0 containing smoke flows into the distribution space SP1 in the housing 10 through the opening 1. At this time, at a position where the inflow portion 2 and the opening 1 are close to each other, the air F1 having a short path from the inflow of the air F0 into the housing 10 to the inflow portion 2 and having a small decrease in the flow velocity reaches the inflow portion 2. do.

On the other hand, at a position where the battery accommodating portion 7D and the opening 1 are close to each other, the wind speed decreases because the path from the air F0 flowing into the housing 10 to the inflow portion 2 is long, and it interferes with the battery accommodating portion 7D. do. Then, the air F2 that has advanced to the vicinity of the first end surface 7D2 of the battery accommodating portion 7D is accelerated by the flow of the air F3 that blows through the gap G1 provided between the first end surface 7D2 and the inflow portion 2, and the flow velocity increases. .. A part of the air F2 (air F4) having an increased flow velocity flows out of the housing 10 through the gap G1, and the remaining part (air F5) reaches the inflow portion 2. The same effect can be obtained when the opening 1 is provided on the bottom surface portion 11A of the first cover 11. For example, the air that has flowed into the housing 10 from around the battery accommodating portion 7D is guided by the battery accommodating portion 7D from the inflow position, accelerated by the flow of the air F3 that blows through the gap G1, and easily flows into the inflow portion 2. ..

Then, the air that has reached the periphery of the inflow portion 2 flows into the space inside the optical table cover 21 through the hole of the net unit 21B of the optical table cover 21. The air that has flowed into the space inside the optical table cover 21 passes through the labyrinth wall 22 and then flows into the detection space 7A1 through the through hole 8A3 of the lid portion 8. When air containing smoke flows into the detection space 7A1, the light of the light emitting portion 3A incident through the hole portion 7A2 of the smoke detection wall portion 7A is scattered in the detection space 7A1. Then, the light receiving unit 3C detects the scattered light, so that smoke is detected. At this time, the control circuit of the substrate 3 sends a signal to the speaker 5 to generate sound.

As described above, in the first embodiment, the detector (smoke detector 100) communicates the detection unit 9 that detects smoke from the air flowing in from the distribution space SP1 and the flow space SP1 and the detection unit 9. A portion 2 and a long structure (battery accommodating portion 7D) are provided. The elongated structure is arranged with an inflow portion 2 and a gap G1 so that the elongated direction extends from the outer periphery of the housing 10 to the inflow portion 2. As a result, the air F3 that has entered through the opening 1 can easily travel straight to the diagonally located opening 1, and the amount of air F4 that blows through the housing 10 can be increased. Therefore, the air F0 easily flows into the housing 10, and the amount of smoke flowing into the inflow portion 2 can be increased. Further, even when air flows in from a direction perpendicular to the long direction of the battery accommodating portion 7D (direction of arrow X), the presence of the gap G1 accelerates the flow of air that blows through and reaches the inflow portion 2 in the same manner. The flow of air can be increased.

Embodiment 2.
FIG. 7 is a schematic view showing the structure of the distribution space SP1 of the smoke detector 300 according to the second embodiment. FIG. 8 is a cross-sectional view showing a CC cross section of FIG. The smoke detector 300 of the second embodiment will be described with reference to FIGS. 7 and 8. Hereinafter, the same configuration as in the first embodiment will be omitted, and only different configurations will be described.

In the smoke detector 100 of the first embodiment described above, the amount of air F0 containing smoke flowing into the housing 10 from the outside can be increased. However, the air that has flowed into the housing 10 may pass through the flow space SP1 without entering the inflow portion 2. Therefore, in the second embodiment, a plurality of ribs are arranged in the distribution space SP1 so that the air flowing into the housing 10 stably flows into the inflow portion 2.

Hereinafter, the flow space SP1 will be described by dividing the flow space SP1 into two with reference to a direction (arrow X direction) perpendicular to the long direction (arrow Y direction) of the battery accommodating portion 7D, passing through the center O2 of the inflow portion 2. Of the bisected distribution space SP1, the region where the distance between the outer circumference of the housing 10 and the outer circumference of the inflow portion 2 is short is set as the first region R1, and the battery accommodating portion 7D is arranged, and the housing is larger than the first region R1. The region where the distance between the outer circumference of the 10 and the outer circumference of the inflow portion 2 is long is defined as the second region R2.

In the first region R1, a plurality of first ribs 91 are arranged radially from the inflow portion 2 to the outer periphery of the housing 10. A gap G2 for passing air is provided between one end of each first rib 91 and the net unit 21B which is the outer periphery of the inflow portion 2. Each of the first ribs 91 is formed on the bottom surface portion 11A of the first cover 11 so as to project toward the partition member 6, and the air flowing into the housing 10 from the opening 1 is brought into the inflow portion 2. Induce.

In the second region R2, a pair of flat plate-shaped second ribs 92 parallel to the long direction (arrow Y direction) of the battery accommodating portion 7D are arranged on the side of the long side surface 7D1 of the battery accommodating portion 7D. There is. Each second rib 92 is also formed on the bottom surface portion 11A of the first cover 11 so as to project toward the partition member 6. As shown in FIG. 8, each second rib 92 extends to the height of the base portion 7 so as not to form a gap between the second rib 92 and the base portion 7 in the vertical direction (arrow Z direction). With such a configuration, each second rib 92 can guide the air that has flowed into the housing 10 from the opening 1 far from the inflow portion 2 to the inflow portion 2. Even when the second rib 92 is arranged only on one side of the battery accommodating portion 7D, the effect of guiding air to the inflow portion 2 can be obtained by the long side surface 7D1 and the second rib 92 on one side.

Further, as shown in FIG. 7, each second rib 92 has a constant distance L from the adjacent long side surface 7D1 in the long direction (arrow Y direction), and each second rib 92 and the battery. It is parallel to the long side surface 7D1 of the accommodating portion 7D. Further, in each second rib 92, the end portion 92a on the side closer to the inflow portion 2 is separated from the inflow portion 2. Here, in the distribution space SP1, when the region formed by the long side surface 7D1 and the second rib 92 extending toward the inflow portion 2 side is defined as the direct inflow region DR, the inflow portion 2 is the direct inflow region. It should be arranged so as to enter the DR. That is, the outer circumference of the inflow portion 2 is arranged in the direct inflow region DR at least at the position farthest from the center O2 of the inflow portion 2 in the arrow X direction. All of the inflow portion 2 may be arranged in the direct inflow region DR. Due to such a positional relationship between the long side surface 7D1, the second rib 92, and the inflow portion 2, the flow path resistance is suppressed. When a pair of second ribs 92 is provided as shown in FIG. 7, the width W2 of the inflow portion 2 may be configured to be narrower than the distance W3 between the pair of second ribs 92.

Further, in the second region R2, a third rib 93 is arranged from the switch 3B exposed in the distribution space SP1 to the inflow portion 2. A gap G3 for passing air is provided between one end of the third rib 93 and the net unit 21B which is the outer periphery of the inflow portion 2. The third rib 93 is also formed on the bottom surface portion 11A of the first cover 11 so as to project toward the partition member 6, and the air flowing into the housing 10 from the opening 1 is brought into the inflow portion 2. Induce.

Next, the air flow in the smoke detector 300 and the operation of the smoke detector 300 will be described. When the air F0 flows into the distribution space SP1, in the first region R1 where the distance between the outer periphery of the housing 10 and the inflow portion 2 is short, the amount of the air F11 toward the inflow portion 2 increases due to the first rib 91. .. In the first region R1, since the path from the air F0 flowing into the housing 10 to the inflow portion 2 is short, the decrease in the flow velocity of the air F11 is suppressed.

On the other hand, when the air F12 that has flowed into the housing 10 from the opening 1 near the battery accommodating portion 7D enters between the long side surface 7D1 of the battery accommodating portion 7D and the second rib 92, it is directly along the inflow region DR. Is guided to the inflow section 2. Since the distance L between the second rib 92 and the long side surface 7D1 is constant in the traveling direction, the pressure difference is relaxed as compared with the case where the distance L becomes narrower toward the inflow portion 2, and the pressure difference is relaxed from the outside into the housing 10. The amount of the inflowing air F0 is secured, and the decrease in the flow velocity of the inflowing air F12 is suppressed. The air F12 that has reached the vicinity of the first end surface 7D2 of the battery accommodating portion 7D is accelerated by the flow of the air F13 that blows through the gap G1 provided between the first end surface 7D2 and the inflow portion 2, and the flow velocity increases. A part of the air F12 (air F14) having an increased flow velocity flows out of the housing 10 through the gap G1, and the remaining part (air F15) reaches the inflow portion 2. Here, since the width W2 of the inflow portion 2 is wider than the width W1 in the short direction of the battery accommodating portion 7D, it is possible to secure an amount that reaches the net portion 21B of the air F12 that has advanced along the long side surface 7D1. Further, since the width W2 of the inflow portion 2 is narrower than the distance W3 between the pair of second ribs 92, the energy due to the second rib 92 of the air F12 traveling to the inflow portion 2 along the long side surface 7D1 of the battery accommodating portion 7D. Loss is minimized. Then, the air that has reached the periphery of the inflow portion 2 flows into the detection space 7A1 through the inflow portion 2, and smoke in the air is detected.

As described above, in the second embodiment, the smoke detector 300 is arranged in the distribution space SP1 so as to have a gap with the inflow portion 2, and extends along the long direction (arrow Y direction) of the battery accommodating portion 7D. The second rib 92 is provided.

As a result, the width of the flow path is maintained as compared with the conventional smoke detector in which the air flow path is narrowed from the opening 1 to the inflow portion 2, and the pressure difference between the opening 1 side and the inflow portion 2 side. Is reduced. Therefore, the flow of the smoke-containing air F0 flowing into the housing 10 and entering between the second rib 92 and the battery accommodating portion 7D is not obstructed. Further, by providing the rib (second rib 92), the air F12 flowing into the housing 10 can be rectified and stably flowed into the inflow portion 2.

Further, in the smoke detector 300, the inflow portion 2 has an inflow portion in a region formed by a side surface (long side surface 7D1) and a rib (second rib 92) in the long direction of the structure (battery accommodating portion 7D). It is arranged so as to enter the direct inflow region DR extending to the 2 side. As a result, the inflow portion 2 can be arranged in the traveling direction of the air F12 guided by the second rib 92 and the structure while suppressing the flow path resistance, and the air F12 can be efficiently flowed into the inflow portion 2. .. Therefore, the smoke inflow characteristics can be improved in both the housing 10 and the inflow portion 2. As described above, in the smoke detector 300 having good smoke inflow characteristics, for example, even in the early stage of a fire, air F0 containing smoke having a slow flow velocity is allowed to flow into the housing 10 and reach the inflow portion 2 to detect smoke. And can detect early fires.

The embodiment of the present invention is not limited to the above embodiment, and various modifications can be made. For example, the structure arranged side by side with the inflow portion 2 in the distribution space SP1 is not limited to the battery accommodating portion 7D accommodating the battery 4, and may be a long structure. The elongated structure may be, for example, a square columnar structure in which the width on the inflow portion 2 side and the width on the outer peripheral side of the housing 10 are different. In this case, the pair of second ribs 92 are not parallel to each other, but the distance L between each second rib 92 and the long side surface 7D1 of the structure is constant in the long direction (arrow Y direction). Therefore, as in the case of the second embodiment, deterioration of the smoke inflow characteristic due to the pressure difference between the opening 1 side and the inflow portion 2 side can be suppressed. At this time, the distance W3 between the pair of second ribs 92 is defined by the distance between the end portions 92a on the inflow portion 2 side in the short direction (arrow X direction).

Further, although the present invention has been described by taking a smoke detector as an example, it goes without saying that the present invention can also be applied to a heat detector and the like. The smoke detector 100 has a detection unit 9 composed of a light emitting unit 3A, a light receiving unit 3C, and the like, but in the case of a heat detector, a temperature sensor that detects the temperature of the air in the detection space 7A1 may be used.

Further, although the pair of second ribs 92 have different lengths, the ribs may have the same length. The length of the second rib 92 may be set to be shorter than the length in the long direction of the battery accommodating portion 7D, which is a structure, and longer than half the length in the long direction. preferable. Further, in the installation position with respect to the battery accommodating portion 7D, when the end portion of the battery accommodating portion 7D slightly protrudes from the end portion 92a of the second rib 92, the air flow to the inflow portion 2 is good.

In the battery accommodating portion 7D, the first end surface 7D2 on the inflow portion 2 side is linear, whereas the second end surface 7D3 on the opening 1 side is formed in an arc shape because the air from the opening 1 is formed. This is to smoothly guide the flow of the battery into the housing 10, but the shape of the battery accommodating portion 7D is not particularly limited. The shape of the battery accommodating portion 7D is a long structure, but it does not have to be a long and thin shape like a wire, and there is a difference in length between the vertical direction and the horizontal direction. It doesn't matter if there is.

Further, in the present embodiment, the inflow unit 2 and the detection unit 9 are not present on the same plane, but the inflow unit 2 and the detection unit 9 are composed of the same member and are present on the same plane. The present invention may be applied to a sensor of the type to be used.

1 Opening, 1A Partition member, 2 Inflow section, 3 Substrate, 3A light emitting section, 3B switch, 3C light receiving section, 3D optical system layout section, 4 battery, 5 speaker, 6 partition member, 7 base section, 7A smoke detection wall 7A1 detection space, 7A2 hole, 7A3 hole, 7A4 protrusion, 7B speaker housing, 7C board housing, 7D battery housing, 7D1 long side, 7D2 first end, 7D3 second end, 8 lid , 8A lid bottom, 8A1 speaker hole, 8A2 switch hole, 8A3 through hole, 8B flange part, 9 detection part, 10 housing, 11 first cover, 11A bottom part, 11A1 mounting hole, 11B side surface part, 12 second Cover, 13 tubular part, 14 main support, 15 auxiliary support, 16 push-in member, 21 optical base cover, 21A lid-like part, 21B mesh part, 22 labyrinth wall, 31 upper surface, 71 base lower surface, 72 base upper surface, 91 1st rib, 92 2nd rib, 92a end, 93 3rd rib, 100 smoke detector, 200 ceiling, 300 smoke detector, DR direct inflow area, G1, G2, G3 gap, L distance, O1 , O2 center, R1 first region, R2 second region, SL reference line, SP1 distribution space.

Claims (2)

A housing having an opening and forming a distribution space through which air flowing in from the opening flows.
A detector that detects smoke or heat from the air that has flowed in from the distribution space,
An inflow unit that is arranged in the distribution space and communicates between the distribution space and the detection unit,
A structure having a long shape and arranged in the distribution space with a gap from the inflow portion so that the long direction extends from the outer periphery of the housing to the inflow portion.
A rib arranged in the distribution space so as to have a gap with the inflow portion and extending along the longitudinal direction of the structure is provided.
The inflow portion is arranged so as to enter the direct inflow region in which the region formed by the long side surface of the structure and the rib is extended toward the inflow portion.
The distance between the side surface in the elongated direction and the rib in the structure is constant in the elongated direction of the structure.
sensor. A housing having an opening and forming a distribution space through which air flowing in from the opening flows.
A detector that detects smoke or heat from the air that has flowed in from the distribution space,
An inflow unit that is arranged in the distribution space and communicates between the distribution space and the detection unit,
A structure having a long shape and arranged in the distribution space with a gap from the inflow portion so that the long direction extends from the outer periphery of the housing to the inflow portion.
A pair of ribs provided on both sides of the structure, which are arranged in the flow space so as to have a gap with the inflow portion and extend along the longitudinal direction of the structure, are provided.
The inflow portion is arranged so as to enter a direct inflow region in which a region formed by each rib and a side surface in the length direction of the structure facing the rib is extended toward the inflow portion.
The pair of ribs are arranged so that the distance between the ends of the pair of ribs on the inflow portion side is larger than the width of the inflow portion.
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