JP5858269B2 - Alarm - Google Patents

Description

  The present invention allows inflow of detected gas and allows inflow of smoke from the outer periphery, a gas sensor capable of detecting the detected gas flowing into the case, a light emitting unit, and a light receiving unit And a photoelectric smoke sensor that senses smoke that has flowed into the case.

  Conventionally, the location where the detection of flammable gas leaks is often the same as the location where fires are likely to occur, and the CO that has been generated due to early detection of fire and incomplete combustion at the time of fire For the reason that it is possible to detect (carbon monoxide), a composite type alarm device including a gas sensor and a smoke sensor is provided.

  As such an alarm device, for example, as described in Patent Document 1, there is a fire gas leak combined type alarm device including a gas sensor and a photoelectric smoke sensor (in the literature, “smoke detection unit”). . In this alarm device, a portion of the case where the smoke sensor is disposed protrudes, and the inflow of smoke is allowed from the outer peripheral portion of the protruding portion.

JP 2000-339567 A

  By the way, since such alarm devices are installed in relatively conspicuous places such as wall surfaces and ceiling surfaces, in recent years, efforts have been made to improve the appearance design of alarm devices, and the thickness of the alarm device is small and compact. A vessel is being developed. For example, what is necessary is just to retire a smoke sensor like the alarm device of patent document 1. FIG. That is, the gas sensor and the smoke sensor may be arranged so that at least a part of their occupied ranges in the thickness direction of the case overlap each other. Thereby, protrusion of a case can be suppressed and it can be set as a neat design.

  However, the smoke sensor must be able to detect smoke from any direction (eight surrounding directions) with a certain response speed. Therefore, as described above, if the smoke sensor is simply retracted, the inflow of smoke is hindered by the gas sensor, and the smoke sensing speed in the direction of the gas sensor may be reduced. In particular, in the case of an alarm device that uses a battery as a power source, the battery housing is also a factor that inhibits the inflow of smoke. Thus, it is very difficult to improve the design of the alarm device while taking into account the inflow of smoke.

  In view of the above circumstances, an object of the present invention is to provide a composite type alarm device having a thin external shape and good responsiveness.

  The first characteristic configuration of the alarm device according to the present invention is capable of detecting a gas to be detected and a case allowing smoke to flow from an outer peripheral portion, and the gas to be detected flowing into the case. A gas sensor, a light emitting unit and a light receiving unit, a photoelectric smoke sensor for sensing smoke flowing into the case, and a battery housing unit for housing a battery, the gas sensor and the smoke sensor, The battery housing portion is a state in which the gas sensor is located on either the back side of the light emitting unit or the back side of the light receiving unit with respect to the smoke sensor with respect to the center of the smoke sensor, and The thickness of the case in a state where the battery housing portion is located on the other side of the rear side of the light emitting unit and the rear side of the light receiving unit with respect to the smoke sensor with respect to the center of the smoke sensor. Each in direction Such that at least a portion of the chromatic ranges overlap each other lies in that disposed inside the casing.

  According to this configuration, the gas sensor, the smoke sensor, and the battery housing portion are arranged inside the case so that at least a part of their occupied ranges in the thickness direction of the case overlap each other. That is, the gas sensor, the smoke sensor, and the battery housing portion are aggregated in the thickness direction of the case and are accommodated in the case in a compact manner, and the thickness of the entire alarm device is reduced.

  Also, normally, out of the outer periphery of the smoke sensor, behind the light emitting unit (on the outer side of the smoke sensor and opposite to the part to be irradiated) and behind the light receiving unit (on the outer side of the smoke sensor, The part that hits the opposite side) is blocked by a wall and does not have an opening for introducing smoke. With this characteristic configuration, the gas sensor and the battery housing unit are provided on the back side of the light emitting unit or the back side of the light receiving unit with respect to the smoke sensor with reference to the center of the smoke sensor. Therefore, compared with the case where the gas sensor and the battery housing portion are provided at positions facing the opening for introducing the smoke of the smoke sensor, it is difficult to inhibit the flow of smoke in each stage, and the responsiveness of smoke detection can be maintained.

  That is, with this feature configuration, it is possible to provide an alarm device with good responsiveness while making the alarm device thin.

  A second characteristic configuration of the alarm device according to the present invention is provided with a plurality of smoke inlets communicating with the inside of the smoke sensor at an outer peripheral portion of the smoke sensor, and the smoke flowing into the case is introduced into the smoke sensor. A plurality of smoke guide portions for guiding to the introduction port are provided, and a gap between the gas sensor or the battery housing portion and the smoke sensor is closed by the smoke guide portion to form a closed region.

  As described above, since the alarm device is configured to be thin, the ratio occupied by the gas sensor and the battery housing portion in the space inside the case is high. For this reason, if there is a gap between the gas sensor or the battery housing part and the smoke sensor, the smoke that passes through both sides of the gas sensor or the battery housing part and flows into the case immediately after the gas sensor or the like is swept away. Entangled in the air, causing convection, and is not smoothly introduced into the smoke sensor from the smoke inlet. For this reason, there is a possibility that the response speed of smoke detection is lowered. With this feature configuration, the gap is closed by the smoke guide part, so that it is a closed area. Smoke that has passed through both sides of the gas sensor etc. is guided to the smoke guide part and smoothly introduced into the smoke sensor. Is done. Therefore, there is no possibility that the response speed of smoke detection is lowered.

  A third characteristic configuration of the alarm device according to the present invention is such that the battery housing portion is positioned above the smoke sensor when the alarm device is attached to a wall surface, and the inner surface of the case in the thickness direction. It is in the point arrange | positioned so that a clearance gap may arise between.

  Smoke detection must be able to detect smoke from any direction with a certain speed of response, and normally there is an opening in the outer periphery of the case that allows smoke to flow in all over the circumference. It has been. For this reason, when the alarm device is attached to the wall surface, dust or the like enters the case from above the alarm device, and further, when this dust or the like enters the inside of the smoke sensor, there is a risk of false detection. In the case of this characteristic configuration, since the battery housing portion is disposed above the smoke sensor, it becomes a shade and the probability that dust from above enters the inside of the smoke sensor is reduced. In addition, even if smoke flows from above, with this feature configuration, a gap is provided between the inner surface of the case and the battery housing portion in the thickness direction. Introduced into the smoke sensor, the response speed can be kept from decreasing.

It is a perspective view of the alarm device which concerns on this invention. It is a front view of the alarm device which concerns on this invention. It is a side view (top view) of the alarm device according to the present invention. It is sectional drawing (back view) of the IV-IV direction in FIG. It is sectional drawing of the VV direction in FIG. It is a disassembled perspective view from the front side of the alarm device which concerns on this invention. It is a schematic diagram which shows the mode of inflow of the smoke from the CO sensor side, Comprising: (a)-(c) changes the inflow direction of smoke.

  Hereinafter, embodiments of an alarm device according to the present invention will be described with reference to the drawings.

[About overall configuration]
As shown in FIGS. 1, 2, 4, and 5, the alarm device allows the inflow of the gas to be detected and allows the inflow of smoke from the outer periphery, and the detected gas that has flowed into the case C Is fixed to the wall surface W (see FIG. 5) or the ceiling surface, the photoelectric smoke sensor 6 for detecting the smoke flowing into the case C, the battery accommodating portion 42 for accommodating the battery B, and the ceiling surface. And a mounting portion 5 from which the case C can be removed. That is, the alarm device according to the present invention is a composite alarm device capable of detecting a gas to be detected and detecting smoke. In the present embodiment, the “gas sensor” is the CO sensor 7, which detects CO (carbon monoxide) gas.

  As shown in FIG. 5, the smoke sensor 6 and the CO sensor 7 are attached to the front side of the substrate 9 and are located in a distribution space S <b> 1 described later. When the smoke sensor 6 senses smoke and the smoke concentration exceeds a preset threshold, or when the CO sensor 7 detects CO gas and the CO gas concentration exceeds a preset threshold, A warning sound is emitted from the speaker 8 built in the case C. If the switch 11 provided on the surface of the case C is pressed, the alarm sound is stopped.

  Hereinafter, on the premise that the alarm device is installed on the wall surface W (see FIG. 5), the side opposite to the wall surface W is defined as the front side or the front side, and the side of the wall surface W is defined as the back side or the rear side. Therefore, “front view” indicates that the alarm device is viewed from the front side, and “back view” indicates that the alarm device is viewed from the back side. As for the up and down direction, the explanation will be made assuming that the upper direction in FIGS. 1, 2, 4, 5 and 7 is “up” of the alarm device and the lower direction is “down”. In FIG. 3, the front direction on the paper is “up”, and in FIG. 6, the left direction on the paper is “up”. “Thickness” refers to the thickness in the front-rear direction, and “thickness direction” refers to the front-rear direction of the alarm device.

[About the case]
As shown in FIGS. 1, 3, 5, and 6, the case C includes a front case 1, a rear case 2, an intermediate case 3, and a rear case cover 4, and has a circular shape in front view. It is a flat shape with no protruding part in the direction. The front case 1, the rear case 2, the rear case cover 4, and the intermediate case 3 are made of resin and are manufactured by injection molding. As shown in FIGS. 5 and 6, the front case 1, the rear case 2, the rear case cover 4, and the intermediate case 3 all have a circular shape having substantially the same diameter in front view.

  The front case 1 serves as a decorative cover on the front side, and its surface is generally flat as shown in FIGS. 1, 3 and 3. However, in detail, the thickness of the center portion is the most. It is thick and slightly inclined toward the outer peripheral part, and the outer peripheral part is slightly thinner than the central part. As shown in FIG. 2, an acoustic port 13 for the speaker 8 is opened above the center on the front side of the front case 1, and a gas circulation port 14 through which CO gas can be circulated is opened at the upper right part from the center. It is. In addition, a ring-shaped lamp cover 12 is disposed at the center of the front case 1 on the front side. The lamp cover 12 covers a lamp (such as a light bulb or a light emitting diode) (not shown) disposed inside the case C. When the lamp is turned on or blinking, the lamp notifies an alarm together with an alarm sound, and also notifies information other than the alarm (such as battery exhaustion or failure).

  As shown in FIG. 6, the rear case 2 has a generally cylindrical shape with a bottom, and is disposed such that the side with the bottom becomes the side of the front case 1, and is greatly opened on the rear side. As shown in FIGS. 1, 3 to 6, the outer periphery of the rear case 2 is formed in a horizontal lattice shape and an inflow port 23 is provided. Smoke and CO gas can flow into and out of the case C from the inlet 23. As shown in FIG. 4, ribs 21 and 22 as “smoke guide portions” to be described later are erected on the rear side of the rear case 2 in the rear direction. A part of the ribs 21 constitutes a closed area such as a CO sensor accommodating portion 24 that accommodates the CO sensor 7 and closed areas 25, 26, and 27 described later.

  As shown in FIG. 2, the CO sensor accommodating portion 24 is disposed on the right side of the central portion of the alarm device in a front view so as to be oriented in a direction (vertical direction) perpendicular to the circular radial direction of the case C. Has been. As shown in FIG. 4, a plurality of gas inlets 28 through which CO gas can be circulated are provided in the upper portion of the outer peripheral surface of the CO sensor accommodating portion 24. In addition, the gas distribution port 14 mentioned above is connected to the upper part of the CO sensor accommodating part 24, as shown in FIG.

  Further, on the front side of the rear case 2, there are provided a recess (not indicated) for accommodating the speaker 8 and an opening (not indicated) for communicating the gas flow port 14 of the front case 1 and the CO sensor accommodating portion 24. is there.

  As shown in FIG. 5, the rear case cover 4 covers the back side of the rear case 2 and constitutes the back side of the case C. As shown in FIGS. 2 and 6, a portion of the rear case cover 4 on the upper left side from the center in the front view is recessed toward the front side to form a battery accommodating portion 42. That is, the battery B can be easily removed from the back side of the case C without disassembling the case C. As shown in FIG. 2, the battery housing portion 42 is disposed so as to be oriented in a direction orthogonal to the circular radial direction of the case C in a front view.

  Thus, the front case 1 constitutes the front surface of the case C, the rear case 2 constitutes the outer peripheral surface of the case C, and the rear case cover 4 constitutes the back surface of the case C. As shown in FIG. 5, the space enclosed by the front case 1, the rear case 2, and the rear case cover 4 is divided into two in the front-rear direction by the intermediate case 3, and the distribution space S 1 on the front side of the intermediate case 3 A substrate space S2 on the rear side of the intermediate case 3 is formed. The CO sensor 7 and the smoke sensor 6 are disposed in the distribution space S1, and the substrate 9 is disposed in the substrate space S2.

  As the size (thickness) of the substrate space S2 in the front-rear direction is sufficient if the substrate 9 can be disposed, the intermediate case 3 has a battery housing portion 42 as shown in FIGS. An opening corresponding to the shape (not indicated) is provided, and a part of the battery housing portion 42 is protruded into the circulation space S1. As a result, the substrate space S2 is thin, and the thickness of the case C is not increased unnecessarily. Further, as shown in FIG. 6, an intermediate case is formed so that the CO sensor 7 and the smoke sensor 6 (see FIG. 5) attached to the front side of the substrate 9 are positioned in the circulation space S1. 3 is provided with openings (not indicated) corresponding to the shapes of the CO sensor 7 and the smoke sensor 6.

[Mounting section]
The attaching portion 5 is fixed to the wall surface W (see FIG. 5) prior to the case C. The attachment portion 5 is made of resin and is manufactured by injection molding. Although not particularly illustrated, the attachment portion 5 is formed with a hole through which a fixing tool such as a plaster board pin can be inserted. Further, the fixing tool may be a fastener such as a screw, and the mounting portion 5 may be provided with a screw hole in addition to the hole for the gypsum board pin. The case C is attached to the attachment portion 5 attached to the wall surface W by engagement or the like.

[About the smoke sensor]
As shown in FIGS. 4 and 6, the smoke sensor 6 has a cylindrical shape, and is provided uniformly on the outer peripheral portion so as to block smoke from a plurality of smoke inlets 63 through which smoke can be introduced. A plurality of labyrinth-like wall portions (not shown) juxtaposed via a gap, a light emitting portion 61 for irradiating light inside the smoke sensor 6, and a light emitting portion scattered by the smoke flowing into the smoke sensor 6 A light receiving unit 62 that senses light from 61.

  Since the smoke inlet 63 is provided uniformly on the outer periphery of the smoke sensor 6, the smoke sensor 6 can sense the smoke regardless of the direction of 360 degrees from which direction the smoke flows into the case C. The light emitting unit 61 and the light receiving unit 62 are provided along the outer peripheral portion of the smoke sensor 6 with a central angle of about 90 degrees in a state directed toward the center of the smoke sensor 6. Of the outer periphery of the smoke sensor 6, the portion that is the back surface of the light emitting unit 61 and the light receiving unit 62 is closed with a wall for light shielding. Further, as the light emitting unit 61, for example, an issuing diode is used, and as the light receiving unit 62, for example, a photodiode is used. Although not shown in particular, an insect net is provided on the outer peripheral side of the smoke inlet 63. Since the smoke sensor 6 has a known configuration, the configuration of the other smoke sensor 6 is not particularly described.

[About CO sensor]
The CO sensor 7 is accommodated in the CO sensor accommodating portion 24 as shown in FIGS. The CO sensor 7 is, for example, an electrochemical sensor, and detects CO gas in incomplete combustion exhaust gas that has flowed into the CO sensor housing portion 24 from the gas flow port 14 or the gas introduction port 28. In this way, not only the smoke sensor 6 but also the CO sensor 7 is provided, and by detecting carbon monoxide due to incomplete combustion, it is possible to detect fire early and prevent CO poisoning.

[Assembling the case]
The assembly of the case C will be described in detail with reference to FIGS. The back side of the front case 1 and the front side (bottom part) of the rear case 2 are set back to back. In the space between the front case 1 and the rear case 2, a speaker 8 and a lamp are disposed.

  Separately, the substrate 9 is set on the front side of the rear case cover 4 so that the smoke sensor 6 and the CO sensor 7 are on the front side, and further, the intermediate case 3 is attached to the rear case from the front side so as to cover the substrate 9. Set on cover 4. At this time, the smoke sensor 6, the CO sensor 7, and the battery housing portion 42 penetrate the intermediate case 3 and are exposed to the front side.

  Finally, a recovery case cover is set on the rear case 2. At this time, the rear case cover 4 and the front case 1 are fixed by screws from the rear side of the rear case cover 4. Thereby, the rear case 2 and the intermediate case 3 are sandwiched and fixed by the front case 1 and the rear case cover 4.

[About the layout of each part]
The layout of each part in the case C will be described. First, the positional relationship among the smoke sensor 6, the CO sensor 7, and the battery housing portion 42 will be described. First, as shown in FIG. 4, the smoke sensor 6 is located on the right side of the center of the case C so that the light emitting unit 61 is located on the upper left side and the light receiving unit 62 is located on the upper right side in the rear view. It is arranged on the lower side.

  As shown in FIG. 4, the CO sensor 7 is disposed slightly to the left with respect to the smoke sensor 6 in the rear view. That is, the CO sensor 7 is disposed so as to be located behind the light emitting unit 61 with the center of the smoke sensor 6 as a reference. In addition, as described above, the CO sensor 7 is oriented in a direction orthogonal to the circular radial direction of the case C, but is not orthogonal to the circular radial direction of the smoke sensor 6, It is a slightly inclined posture.

  As shown in FIG. 4, the battery housing portion 42 is disposed substantially upward with respect to the smoke sensor 6 in the rear view. That is, the battery housing part 42 is disposed so as to be located behind the light receiving part 62 with respect to the center of the smoke sensor 6. Further, as described above, the battery housing portion 42 is also oriented in a direction orthogonal to the circular radial direction of the case C, but is not orthogonal to the circular radial direction of the smoke sensor 6. A slightly inclined attitude.

  That is, since the CO sensor 7 and the battery housing portion 42 are in a posture orthogonal to the circular radial direction of the case C, the CO sensor 7 and the battery housing portion 42 are most compactly housed in the case C. Further, since the CO sensor 7 and the battery housing portion 42 are not orthogonal to the circular radial direction of the smoke sensor 6, the width of the CO sensor 7 and the battery housing portion 42 that are found based on the smoke sensor 6. Becomes narrow, and the flow of smoke to the smoke sensor 6 is difficult to be hindered. Furthermore, since the CO sensor 7 and the battery housing part 42 are located on the back side of the light emitting part 61 and the back side of the light receiving part 62 that are blocked by the wall with respect to the center of the smoke sensor 6, Less impact on distribution.

  Further, in the thickness direction of the case C, as shown in FIG. 5, the smoke sensor 6, the CO sensor 7, and the battery housing portion 42 are arranged inside the case C so that a part of their occupied ranges overlap each other. It is arranged. That is, by integrating these as much as possible in the thickness direction of the case C and compactly accommodating them in the case C, a thin alarm device is obtained.

  As shown in FIG. 4, the battery housing portion 42 is arranged in a posture over the entire area in the width direction (left and right direction on the paper surface) of the smoke sensor 6 in the substantially upward direction of the smoke sensor 6. Further, as shown in FIG. 5, a gap G is provided between the battery housing portion 42 and the rear portion of the rear case 2. Therefore, when the alarm device is mounted on a wall and used, even if dust or the like enters the case C from above the alarm device, the battery housing portion 42 becomes a shade and the dust reaches the smoke sensor 6. Can be prevented. Even if smoke flows from above, since the gap G is provided, a certain amount of smoke is introduced into the smoke sensor 6 from the gap G, and a decrease in response speed can be suppressed.

[About ribs]
The smoke flowing in from the inflow port 23 is guided to the ribs 21 and 22 (see FIG. 4) and reaches the smoke introduction port 63. As described above, the ribs 21 and 22 are erected from the back side of the rear case 2 toward the back side, and the tips thereof are in contact with the intermediate case 3. That is, as shown in FIG. 5, the ribs 21 and 22 partition the circulation space S1 into a plurality of flow paths.

  As shown in FIG. 4, the rib 21 extends from the smoke inlet 63 toward the outer peripheral portion of the case C, and the end reaches the outer peripheral portion of the case C. On the other hand, the rib 22 similarly extends from the smoke introduction port 63 toward the outer peripheral portion of the case C, but the end does not reach the outer peripheral portion of the case C. Regardless of which rib (21, 22), the provision of the ribs 21, 22 makes it possible to smoothly guide the inflowing smoke to the smoke inlet 63 regardless of the direction in which smoke flows. The reason why the end of the rib 22 does not reach the outer periphery of the case C will be described later.

  Further, as shown in FIG. 4, the rib 21 closes the space between the CO sensor 7 and the smoke sensor 6 to form a closed closed region 25. The closed region 25 is a region that is integrated with the CO sensor accommodating portion 24 and is formed over the entire range between the outer peripheral portion of the case C and the outer peripheral portion of the smoke sensor 6. As described above, since the smoke sensor 6, the CO sensor 7, and the battery housing portion 42 are aggregated in the thickness direction in order to configure the alarm device to be thin, the ratio occupied by the CO sensor 7 in the distribution space S <b> 1 is high. . Further, since the CO sensor accommodating portion 24 extends over the rear side of the rear case 2 and the front side of the intermediate case 3 in the circulation space S1, if there is a gap between the CO sensor 7 and the smoke sensor 6, the CO sensor The smoke flowing into the case C after passing through the flow passages A1 and A2 on both sides of the air flow 7 is entangled in the gap immediately after dodging the CO sensor 7 and is disturbed by convection and the like, and the smoke introduction port 63 smoothly. Are not introduced into the smoke sensor 6. For this reason, there is a possibility that the response speed of smoke detection is lowered.

  However, since the gap is closed by the rib 21 to form the closed region 25, the smoke is smoothly guided from the smoke inlet 63 to the smoke inlet 63, and the above-described flow is not disturbed. Similarly, the outer peripheral wall 41 erected from the outer peripheral portion on the front side of the rear case cover 4, the screw boss for assembling the front case 1 and the rear case cover 4, etc., can cause disturbance of the flow of smoke. The portions are surrounded by ribs 21 to form closed regions 26 and 27.

[Inflow of smoke from a specific direction]
The rib 22 whose end does not reach the outer peripheral portion of the case C will be described with reference to FIGS. In the present embodiment, as shown in FIG. 4, the length of the CO sensor 7 in the longitudinal direction (vertical direction) exceeds 1/2 of the diameter of the case C. Therefore, when smoke flows from a direction perpendicular to the longitudinal direction of the CO sensor 7 (see FIG. 7B) or a direction close thereto (see FIGS. 7A and 7C), the smoke flows from the inlet 23. The amount of smoke flowing into the case C tends to be small. In this case, the amount of smoke introduced into the smoke inlet 63 corresponding to that direction is reduced, and the response speed to the smoke from that direction may be reduced. Accordingly, the ribs 21 and 22 are bent in the middle so that the flow passage A1 and the flow passage A2 adjacent to the CO sensor accommodating portion 24 expand in a trumpet shape as they approach the outer peripheral portion of the case C, and the corresponding inflow ports The opening of 23 is widened so that as much smoke as possible can flow in.

  Incidentally, a closed region 26 exists on the opposite side of the CO sensor accommodating portion 24 across the rib 22. This closed region 26 is different from the closed region by the CO sensor accommodating portion 24 and the closed region 25 so as not to cover the entire range between the outer peripheral portion of the case C and the outer peripheral portion of the smoke sensor 6. Yes, a flow passage A3 is formed. This is because if the area is closed between the closed area 26 and the outer periphery of the smoke sensor 6, the amount of smoke inflow from the vicinity of the CO sensor accommodating section 24 is considerably reduced. The closed region 26 has a relatively narrow width in the circumferential direction, and one side of the region between the closed region 26 and the outer periphery of the smoke sensor 6 is partitioned by the rib 21, so that the smoke that has flowed in Disturbance does not occur so much.

  However, if the end of the rib 22 reaches the outer periphery of the case C, when smoke flows from the direction as shown in FIGS. 7B and 7C, the flow passage A1 and the flow passage A2 Smoke appropriately flows in, but the flow path A3 is blocked by the end portion of the rib 22 so that almost no smoke flows, and eventually the response speed to smoke from those directions decreases.

  Therefore, in the present embodiment, the rib 22 is prevented from reaching the outer peripheral portion of the case C. Accordingly, as shown in FIGS. 7A, 7B, and 7C, the direction perpendicular to the longitudinal direction of the CO sensor 7 (see FIG. 7B) or a direction close thereto (FIG. 7A). , (C)), when smoke flows from the smoke introduction port 63, the smoke is smoothly and uniformly introduced into the smoke introduction port 63 on the CO sensor 7 side. As a result, the CO sensor accommodating portion 24 It is suitably prevented that the response speed decreases due to the provision of.

  The battery housing part 42 is also a wide area as with the CO sensor housing part 24, but as described above, there is a gap G between the back surface of the rear case 2 and the battery housing part 42 (see FIG. 5), the amount of inflow with respect to the smoke from the direction of the battery accommodating portion 42 can be secured.

[Another embodiment]
(1) Although the front view shape of the case C is circular in the above-described embodiment, it is not limited to this shape. The shape of the case C viewed from the front may be a shape other than a circular shape, for example, a polygonal shape such as a triangular shape or a quadrangular shape, or an elliptical shape.

(2) In the above-described embodiment, an example in which the gap G is provided between the battery housing portion 42 and the rear portion of the rear case 2 has been described, but a configuration in which the gap G is not provided may be employed. . In this case, in order to ensure the amount of smoke inflow from the direction of the battery housing portion 42, the gap between the battery housing portion 42 and the outer periphery of the smoke sensor 6 is appropriately closed by the rib 21 so that A region may be formed or the rib 22 may be provided around the periphery.

(3) In the above-described embodiment, the closed region 26 is shown on the opposite side of the CO sensor accommodating portion 24 with the rib 22 interposed therebetween. However, for example, the single rib 21 reaching the outer peripheral portion of the case C is used. May be. Also in this case, the rib 22 has the same effects as described above.

(4) In the above-described embodiment, the example in which the ribs 22 are provided only on one side of the both sides of the sensor housing portion 24 has been described. However, the ribs 22 are provided on both sides of the sensor housing portion 24 as necessary. It may be provided. Further, the closed area is not limited to the sensor accommodating portion 24, and may be another closed area (closed areas 26, 27, etc.). Then, ribs 22 may be provided on one side or both sides adjacent to another closed region. In addition, when the closed area | regions adjoin and there is only one rib between them, the rib 22 may be shared.

  The present invention is not limited to an alarm device including a CO sensor and a smoke sensor, but can be applied to an alarm device including another gas sensor and a smoke sensor.

6 Smoke sensor 7 CO sensor (gas sensor)
21 Rib (Smoke Guide)
25 Closed area (closed area)
42 Battery housing part 61 Light emitting part 62 Light receiving part 63 Smoke inlet C Case G Gap W Wall surface

Claims (3)

A case that allows inflow of the gas to be detected and also allows inflow of smoke from the outer periphery,
A gas sensor capable of detecting the detected gas flowing into the case;
A photoelectric smoke sensor that has a light emitting part and a light receiving part and senses smoke flowing into the case;
A battery housing part for housing the battery,
The gas sensor, the smoke sensor, and the battery housing portion are
The gas sensor with respect to the smoke sensor is located on the back side of the light emitting unit and the back side of the light receiving unit with respect to the center of the smoke sensor, and with respect to the smoke sensor In a state where the battery housing part is located on the other side of the light emitting part and the light receiving part on the other side with respect to the center of the smoke sensor,
An alarm device disposed inside the case such that at least a part of the occupied range in the thickness direction of the case overlaps each other. A plurality of smoke introduction ports communicating with the inside of the smoke sensor are provided on the outer periphery of the smoke sensor, and a plurality of smoke guide portions for guiding the smoke flowing into the case to the smoke introduction port,
The alarm device according to claim 1, wherein a gap between the gas sensor or the battery housing part and the smoke sensor is closed by the smoke guide part and is a closed area.   The battery housing portion is disposed so as to be positioned above the smoke sensor when the alarm device is attached to a wall surface, and so that a gap is formed between the inner surface of the case in the thickness direction. The alarm device according to claim 1.

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