TW202318350A - smoke detector - Google Patents

Abstract

To reduce possibility of a non-fire alarm or detection omission of fire caused by intrusion of insects. A smoke detector includes a body base plate 1. The body base plate 1 includes a cylindrical wall 103 forming a smoke detection space, and a rib 105 having both ends connected to an outer surface of the cylindrical wall 103 and forming a light-receiving unit housing space relative to the outside surface. Under the body base plate 1, a substrate is arranged substantially in parallel. An end portion of the substrate abuts on the outer surface and covers the light-receiving unit housing space. The rib 105 extends from a lower surface of the body base plate 1 toward the substrate so as to prevent intrusion of insects into the light-receiving unit housing space.

Description

smoke detector

The invention relates to a smoke detector.

Conventionally, there is a scattered light type smoke detector (for example, refer to Patent Document 1). Scattered light smoke detectors generally have a dark box and a pair of light-emitting and light-receiving elements. The light from the light-emitting element is scattered by the smoke flowing into the dark box, and the scattered light is received by the light-receiving element. , thereby sensing fire. [Prior Art Literature] [Patent Document]

Patent Document 1: Japanese Patent Laid-Open No. 2019-175501

[Problem to be Solved by the Invention]

In some cases, insects such as spiders may invade such a smoke detector. When insects invade the smoke detector and go deep into the dark box, there is a possibility that the light of the light-emitting element will be scattered by the intruding insects, and the scattered light will be received by the light-receiving element. When light is received by the light receiving element, a fire will be sensed even though no fire has actually occurred. As yet another possibility, it is conceivable that light emission by the light emitting element or light reception by the light receiving element is hindered by intruding insects, and a fire cannot be sensed even though a fire actually occurs.

The present invention is developed in view of such a situation, and its purpose is to reduce the possibility of non-fire alarm or fire detection omission caused by the invasion of insects. [Means to solve the problem]

In order to solve the above-mentioned problems, the smoke detector of the present invention is characterized by comprising: a body base plate; and a substrate disposed under the body base plate approximately parallel to the body base plate; The bottom plate of the body has: a cylindrical wall, which is arranged on the lower surface of the bottom plate of the body, and forms a smoke detection space; and a first rib (rib), which is connected to the first wall constituting the cylindrical wall at both ends part, and form a light-receiving part accommodating space between the aforementioned first wall part, and extend from the bottom surface of the aforementioned body bottom plate toward the aforementioned substrate in order to prevent insects from intruding into the light-receiving part accommodating space; the aforementioned substrate is Make its end abut against or close to the outer side of the first wall, and cover the accommodating space of the light-receiving part; a light-emitting part and a light-receiving part are mounted on the upper surface of the substrate, and the light-emitting part irradiates light on the above-mentioned In the smoke detection space, the light-receiving unit is housed in the light-receiving unit accommodation space, and receives light irradiated from the light-emitting unit and scattered by particles of smoke through the first light passing hole formed on the first wall. Light. [Invention effect]

According to the present invention, the possibility of missing non-fire alarm or fire detection caused by the invasion of insects can be reduced.

1. Implementation form 1-1. Configuration of smoke detector 100

A smoke detector 100 according to an embodiment of the present invention will be described with reference to FIG. 1 to FIG. 5 . 1 to 4 referred to in this description are a bottom view, a side view, a top view and an exploded perspective view of the smoke detector 100 . Fig. 5 is a sectional view of line A-A of Fig. 3 .

Among these figures, especially as shown in FIG. 4 and FIG. 5, the smoke detection sensor 100 includes: a circular body bottom plate 1; a substantially L-shaped substrate 2 and a circular speaker (speaker) 3 , which is arranged substantially parallel under the bottom plate 1 of the body; and a substantially circular middle plate 4, which is arranged substantially parallel under the base plate 2; and a cylindrical body cover 5 with a bottom, which accommodates The main body bottom plate 1 , the base plate 2 , the speaker 3 and the middle plate 4 are all fixed to the main body bottom plate 1 at the same time. Hereinafter, each constituent element of the smoke detector 100 will be sequentially described.

1-2. Composition of the main body bottom plate 1 First, the body bottom plate 1 will be described with reference to FIGS. 6 to 8 . FIG. 6 referred to in this description is a bottom view of the main body chassis 1, and FIGS. 7 and 8 are bottom perspective views from different viewpoints.

As shown in these figures, the main body chassis 1 has a battery housing portion 101 formed from its center to its peripheral edge. The battery housing portion 101 is convex toward the lower surface of the main body bottom plate 1 and concave toward the upper surface, and a cylindrical battery is accommodated in the concave groove on the upper surface. The battery accommodated in the battery housing portion 101 is connected to the substrate 2 and supplies power to circuits on the substrate 2 .

Furthermore, the main body bottom plate 1 has a speaker accommodating portion 102 formed adjacent to the battery accommodating portion 101 . The speaker accommodating portion 102 is a substantially C-shaped rib protruding vertically from the lower surface of the main body bottom plate 1 . The speaker 3 is accommodated in the speaker housing portion 102 .

The speaker housing portion 102 has a hook 1021 on its outer peripheral surface. The hook 1021 is locked to a locking hole 422 (see FIG. 18 ) of the middle plate 4 described later.

Also, the main body bottom plate 1 has a cylindrical wall 103 formed on the axis of the battery accommodated in the battery housing portion 101 . The cylindrical wall 103 is an equipod-shaped rib protruding vertically from the bottom surface of the main body bottom plate 1 . The lower end of the cylindrical wall 103 abuts against the upper surface of the middle plate 4 and forms a smoke detecting space.

The cylindrical wall 103 is constituted by four linear wall portions 1031 , 1032 , 1033 and 1034 . Here, the wall portion 1033 has a light passing hole 1035 for the light emitting portion 205 described later to irradiate light into the smoke detection space. Furthermore, the wall portion 1034 has a light passage hole 1036 for the light receiving portion 206 to receive light from the smoke detecting space, which will be described later.

The bottom plate 1 of the main body is provided with a substantially U-shaped rib 104 formed by connecting its two ends to the outer side of the wall portion 1033 . The rib 104 and the wall 1033 form a space for accommodating the light emitting unit.

The ribs 104 vertically extend from the lower surface of the main body bottom plate 1 toward the substrate 2 in order to prevent insects from entering into the light-emitting portion accommodating space, and abut against the upper surface of the substrate 2 .

The bottom plate 1 of the main body is provided with a substantially U-shaped rib 105 formed by connecting its two ends to the outer side of the wall portion 1034 . The rib 105 and the wall 1034 form a light receiving unit accommodation space.

The ribs 105 extend perpendicularly from the bottom surface of the main body bottom plate 1 toward the base plate 2 in order to prevent insects from entering the receiving space of the light receiving unit. Although there is a slight gap between the ribs 105 and the base plate 2, the gap is approximately the same as the mesh size of the insect-proof net 6 (see FIG. 4 ) described later. That is, it is a size that hinders the passage of insects.

Furthermore, the main body bottom plate 1 has a base plate mounting portion 106 . The substrate mounting portion 106 is a rib protruding vertically from the lower surface of the main body bottom plate 1, and is formed so as to surround a substantially L-shaped region. The peripheral portion of the upper surface of the substrate 2 is mounted on the substrate mounting portion 106 .

The substrate mounting portion 106 has two hooks 1061 and 1062 on its outer surface. The two hooks 1061 and 1062 are respectively locked in locking holes 423 and 424 of the middle plate 4 described later (see FIG. 18 ).

Also, the main body bottom plate 1 has two push-in portions 107A and 107B formed on opposite sides of the speaker accommodating portion 102 with the battery accommodating portion 101 interposed therebetween. The two push-in portions 107A and 107B are rod-shaped members formed by forming a U-shaped through groove in the main body bottom plate 1 .

The push-in part 107A among the two push-in parts 107A and 107B is configured in such a way as to be in contact with the registration switch 209 described later, when the push-in part 107A is pushed in by the user, the registration switch 209 will be pressed. . On the other hand, the push-in portion 107B is arranged so as to be in contact with the erase switch 210 described later, and when the push-in portion 107B is pushed in by the user, the erase switch 210 is pressed.

Also, the main body bottom plate 1 has two pillar-like antenna holders 108 and 109 protruding vertically on its peripheral edge. The antenna holding part 108 among the two antenna holding parts 108 and 109 is disposed adjacent to the outer side of the board mounting part 106 . The antenna holding portion 108 is inserted into an insertion hole 416 (see FIG. 15 ) of the middle plate 4 described later. In addition, the antenna holder 108 has a U-shaped groove formed at its front end, and the antenna 212 is fitted into the groove.

On the other hand, the antenna holder 109 is arranged on the axis of the battery accommodated in the battery housing 101 . The antenna holding portion 109 is inserted into a locking hole 425 (see FIG. 15 ) of the middle plate 4 described later. In addition, the antenna holder 109 has a U-shaped groove formed at its front end, and the antenna 212 is fitted into the groove.

In addition, the antenna holder 109 has a hook 1091 on its outer surface (in other words, the surface opposite to the surface facing the cylindrical wall 103). The hook 1091 is locked to a locking hole 425 (see FIG. 15 ) of the middle plate 4 described later.

Also, the main body bottom plate 1 has a pair of plate-shaped switch holding portions 110 and 111 protruding vertically on its peripheral edge. The pair of switch holding parts 110 and 111 hold the light switch 8 which will be described later.

Among the pair of switch holding parts 110 and 111, the switch holding part 110 is formed with a U-shaped groove and a U-shaped groove at its front end. Among these grooves, the shaft portion of the light switch 8 is embedded in the U-shaped groove, and the antenna 212 is embedded in the U-shaped groove. On the other hand, the switch holding portion 111 has a U-shaped groove formed at its front end. The shaft portion of the light switch 8 is embedded in the U-shaped groove. The above is the description about the main body bottom plate 1 .

1-3. Composition of Substrate 2 Next, the substrate 2 will be described with reference to FIGS. 9 to 11 . 9 to 11 referred to in this description are a bottom view, a top view, and a bottom perspective view of the substrate 2 .

As shown in these figures, the substrate 2 has a fan-shaped notch 201 whose center angle is substantially at a right angle. The area where the notch 201 is formed is where the battery housing portion 101 of the main body bottom plate 1 and the speaker 3 are disposed. The speaker 3 arranged in this area is connected to the substrate 2 .

Furthermore, the substrate 2 has an equipod-shaped notch 202 . In the area where the notch 202 is formed, the cylindrical wall 103 of the main body bottom plate 1 is disposed.

In addition, the base plate 2 has a pair of rectangular notch portions 203 and 204 facing each other across an equipod-shaped notch portion 202 .

Also, a light emitting unit 205 is mounted on the upper surface of the substrate 2 . The light emitting unit 205 is, for example, a light emitting diode. The light emitting part 205 is housed in the light emitting part accommodation space formed by the cylindrical wall 103 and the ribs 104 of the main body bottom plate 1 , and irradiates light into the smoke detection space formed by the cylindrical wall 103 . At this time, the light emitting part 205 irradiates the light into the smoke detection space through the light passing hole 1035 of the cylindrical wall 103 .

Furthermore, a light receiving unit 206 is mounted on the upper surface of the substrate 2 . The light receiving unit 206 is, for example, a photodiode housed in a shield case. The light receiving part 206 is housed in the light receiving part accommodation space formed by the cylindrical wall 103 and the ribs 105 of the main body bottom plate 1, and receives the light from the light emitting part 205 scattered by the particles of smoke. At this time, the light receiving unit 206 receives the scattered light through the light passing hole 1036 of the cylindrical wall 103 .

The light emitting part 205 and the light receiving part 206 are arranged along the notch part 202 of the equipod shape so that the mutual optical axes are not on the same straight line.

Also, on the lower surface of the substrate 2, a check switch 207 and a confirmation lamp 208 are mounted. The check switch 207 here is a switch used for testing the internal circuit or battery life. This check switch 207 is just pressed when the light switch 8 described later is pushed in. On the other hand, the confirmation lamp 208 is an LED for notifying the result of the test.

Also on the upper surface of the substrate 2, a register switch 209 and an erase switch 210 are mounted. The login switch 209 is a switch used for setting the radio channel (radio channel) used by the smoke detector 100; the erase switch 210 is a switch used for erasing the setting of the radio channel.

Furthermore, a connector (connector) 211 is mounted on the upper surface of the substrate 2 .

Also, an antenna 212 made of metal wires is connected to the substrate 2 . The antenna 212 is composed of a straight line portion 2121 and an arc portion 2122 . One end of the straight portion 2121 is connected to the wireless communication circuit 215 (not shown), extends vertically from the lower surface of the substrate 2, and then penetrates into the antenna hole 420 of the middle board 4 (see FIG. 15 ). On the other hand, the arc portion 2122 has one end connected to the other end of the straight portion 2121 and extends in an arc shape to surround the equipod-shaped notch 202 .

Also, a conductor 213 made of a metal wire is connected to the substrate 2 . The conductor 213 is formed by a straight line portion 2131 and an arc portion 2132 . One end of the straight portion 2131 is connected to the ground (not shown) on the substrate 2 and extends along the lengthwise direction of the battery containing portion 101 . On the other hand, the arc portion 2132 has one end connected to the other end of the straight portion 2131 and extends in an arc shape to surround the speaker 3 .

Also, a control circuit 214 not shown is mounted on the substrate 2 . The control circuit 214 executes fire detection processing, fire signal transmission processing, and radio channel setting processing described later.

Also, a wireless communication circuit 215 (not shown) is mounted on the substrate 2 . The wireless communication circuit 215 uses the antenna 212 to communicate wirelessly with other smoke detectors 100 or relay devices. The above is the description about the substrate 2 .

The substrate 2 described above is mounted on the substrate mounting portion 106 of the main body bottom plate 1 at the periphery of the upper surface. Moreover, the speaker 3 connected to the base plate 2 is embedded in the speaker accommodation portion 102 of the main body bottom plate 1 . 12 and 13 are bottom and side views of the substrate 2 and speaker 3 mounted on the main body chassis 1 in this way. Fig. 14 is an enlarged view of part B of Fig. 12 .

In these figures, especially as shown in FIG. 12 , in the area where the fan-shaped notch 201 of the substrate 2 is formed, the battery housing portion 101 of the main body bottom plate 1 is arranged. In addition, the cylindrical wall 103 of the base plate 1 is disposed in the area where the equipod-shaped notch 202 of the substrate 2 is formed. The notch 202 of the substrate 2 is in contact with the outer side of the cylindrical wall 103 .

More specifically, as shown in FIG. 14 , the notch portion 202 is in contact with the outer side surfaces of the wall portions 1031 , 1033 and 1034 among the four wall portions 1031 to 1034 constituting the cylindrical wall 103 . For this reason, the substrate 2 covers the housing space for the light-emitting unit and the housing space for the light-receiving unit formed on the base plate 1 of the body. Moreover, the through-hole 216 is formed between the rectangular notch part 203 of the substrate 2 and the wall part 1033 . The through hole 216 is a through hole that communicates the space between the base plate 2 and the middle plate 4 with the space for accommodating the light emitting unit. In addition, a through-hole 217 is formed between the rectangular notch portion 204 of the substrate 2 and the wall portion 1034 . The through-hole 217 is a through-hole that communicates the space between the base plate 2 and the middle plate 4 with the light-receiving unit accommodating space.

Also, as shown in FIG. 12 , the antenna 212 that has been connected to the substrate 2 is clamped by the ㄇ-shaped groove formed on the front end of the antenna holding parts 108 and 109 of the main body bottom plate 1 and the switch holding part 110. .

1-4. Composition of middle plate 4 Next, the middle plate 4 will be described with reference to FIGS. 15 to 18 . 15 to 18 referred to in this description are bottom views, bottom perspective views, top views, and top perspective views of the middle plate 4 .

As shown in these figures, the middle plate 4 has a substantially U-shaped notch 401 formed from the center to the peripheral edge. In the area where the notch 401 is formed, the battery housing portion 101 of the main body bottom plate 1 is disposed.

Furthermore, the middle plate 4 has an elliptical air hole 402 formed on the opposite side of the notch 401 with its center interposed therebetween. The vent hole 402 is a vent hole that communicates the space between the middle plate 4 and the body cover 5 with the smoke detecting space formed on the body bottom plate 1 .

And the middle plate 4 has three labyrinth walls 403 to 405 formed around the air hole 402 . The three labyrinth walls 403 to 405 are plate-shaped walls protruding vertically from the lower surface of the middle plate 4 . The three labyrinth walls 403 to 405 are formed so as not to prevent smoke from flowing into the vent hole 402 , but to prevent external light from entering the vent hole 402 .

And the middle plate 4 has a pair of rectangular locking holes 406 and 407 formed around the labyrinth walls 403 to 405. The pair of locking holes 406 and 407 are locking holes for locking with hooks of the optical table cover 7 (see FIG. 4 ), which will be described later.

And the middle plate 4 has eight radial antenna holders 408 to 415 formed around the labyrinth walls 403 to 405. The eight-piece antenna holders 408 to 415 are substantially linear plates protruding vertically from the lower surface of the middle plate 4 . The eight antenna holders 408 to 415 have notches at their front ends, and the antennas 212 are embedded in the notches.

Furthermore, the middle plate 4 has a rectangular insertion hole 416 formed on its peripheral edge. The antenna holder 108 of the main body chassis 1 is inserted through the insertion hole 416 .

Furthermore, the middle plate 4 has a plurality of speaker holes 417 formed adjacent to the ㄇ-shaped notch 401 . The plurality of speaker holes 417 are disposed under the speaker 3 .

Furthermore, the middle plate 4 has a switch hole 418 and a display hole 419 formed adjacent to the notch portion 401 in the shape of a ㄇ. Among these holes, the switch control 418 is the insertion hole inserted by the inspection switch 207 . On the other hand, the display hole 419 is a light passing hole for passing the light of the confirmation lamp 208 .

Furthermore, the middle plate 4 has an antenna hole 420 formed on its peripheral portion. The antenna hole 420 is an insertion hole through which the antenna 212 is inserted.

Furthermore, the middle plate 4 has a side wall 421 erected on the peripheral portion of its upper surface.

Furthermore, the middle plate 4 has three rectangular locking holes 422 to 424 formed on the side wall 421 . Among the three locking holes 422 to 424, the hook 1021 of the body bottom plate 1 is locked in the locking hole 422, the hook 1061 of the body bottom plate 1 is locked in the locking hole 423, and the hook 1061 of the body bottom plate 1 is locked in the locking hole 424. The hook 1062 of the body bottom plate 1 is locked.

Furthermore, the middle plate 4 has a locking hole 425 formed from its peripheral edge to the side wall 421 . As shown in FIG. 16 , the locking hole 425 is arranged so as to sandwich the labyrinth wall 404 with the air hole 402 . The locking hole 425 is formed by connecting a rectangular hole formed in the peripheral portion and a rectangular hole formed in the side wall 421 . Among these holes, the antenna holder 109 of the main body chassis 1 is inserted through the former hole. On the other hand, the hook 1091 of the main body bottom plate 1 is locked in the latter hole.

In addition, the middle plate 4 has a partition wall 426 formed by connecting its two ends to the side wall 421 , and the partition wall 426 is used to separate the ventilation hole 402 from the locking hole 425 . The partition wall 426 is a plate protruding vertically from the upper surface of the middle plate 4 .

Furthermore, the middle plate 4 has a pair of ribs 427 and 428 formed to surround the air hole 402 together with the partition wall 426 . The pair of ribs 427 and 428 are formed to extend substantially perpendicularly from the upper surface of the middle plate 4 toward the base plate 2 . Although there is a slight gap between the pair of ribs 427 and 428 and the base plate 2, the gap is approximately the same as the mesh size of the insect-proof net 6 (refer to FIG. 4 ) described later. That is, it is a size that hinders the passage of insects.

The rib 427 among the pair of ribs 427 and 428 includes: a straight portion 4271 formed by connecting one end to the partition wall 426; and a U-shaped portion 4272 formed by connecting one end to the other end of the straight portion 4271; and One end thereof is connected to the other end of the ㄇ-shaped portion 4272 to form a straight line portion 4273 . On the other hand, the rib 428 includes: a straight portion 4281 formed by connecting one end to the partition wall 426 ; and a U-shaped portion 4282 formed by connecting one end to the other end of the straight portion 4281 . In the space formed by the pair of ribs 427 and 428 and the partition wall 426, the lower end of the cylindrical wall 103 of the main body bottom plate 1 is embedded. The above is the description about the middle plate 4 .

The middle plate 4 described above is installed on the main body bottom plate 1 in such a manner as to cover the base plate 2 and the speaker 3 . At this time, the middle plate 4 can be fixed to the body bottom plate 1 by locking the hooks 1021 , 1061 , 1062 and 1091 of the body bottom plate 1 into the locking holes 422 to 425 of the middle plate 4 . Fig. 19 and Fig. 20 are the bottom view and the side view of the middle plate 4 installed on the main body bottom plate 1 in this way. Fig. 21 is a sectional view taken along line C-C of Fig. 20 . Fig. 22 is an enlarged view of part D in Fig. 21 .

In these figures, especially as shown in FIG. 19 , in the region where the notch 401 of the middle plate 4 is formed, the battery housing portion 101 of the main body bottom plate 1 is arranged. Also, the antenna holding portion 108 of the main body bottom plate 1 is inserted through the insertion hole 416 of the middle plate 4 . In addition, the antenna holder 109 of the main body bottom plate 1 is inserted through the locking hole 425 of the middle plate 4 . Also, the antenna 212 is inserted through the antenna hole 420 of the middle plate 4 . Also, the antenna 212 inserted through the antenna hole 420 is embedded in the notch of the antenna holding parts 408 to 415 of the middle plate 4 . Also, the switch hole 418 of the middle plate 4 is inserted with the check switch 207 . Also, from the display hole 419 of the middle plate 4, the confirmation lamp 208 can be seen.

In particular, as shown in FIG. 22 , the lower end of the cylindrical wall 103 of the body bottom plate 1 is embedded in the space formed by the partition wall 426 of the middle plate 4 and a pair of ribs 427 and 428 . As a result, the partition wall 426 of the middle plate 4 abuts against the outer sides of the wall portions 1032 to 1034 constituting the cylindrical wall 103 . Moreover, the ribs 427 of the middle plate 4 are in contact with the outer sides of the wall portions 1031 and 1034 constituting the cylindrical wall 103 . In particular, the two ends of the ㄇ-shaped portion 4272 of the rib 427 abut against the outer side of the wall portion 1034 and surround the through hole 217 . In addition, the upper end of the ㄇ-shaped portion 4272 is close to the substrate 2 to the extent that it hinders the passage of insects. For this reason, the ㄇ-shaped portion 4272 is used in the space between the middle plate 4 and the base plate 2 to prevent insects from entering the through hole 217 .

Moreover, the ribs 428 of the middle plate 4 are in contact with the outer side of the wall portion 1033 constituting the cylindrical wall 103 . In particular, the two ends of the ㄇ-shaped portion 4282 of the rib 428 abut against the outer side of the wall portion 1033 and surround the through hole 216 . In addition, the upper end of the ㄇ-shaped portion 4282 is close to the substrate 2 to the extent that it hinders the passage of insects. For this reason, the ㄇ-shaped portion 4282 is used in the space between the middle plate 4 and the base plate 2 to prevent insects from entering the through hole 216 .

1-5. Composition of the main body cover 5 The body cover 5 will be described with reference to FIGS. 23 to 25 . 23 to 25 referred to in this description are bottom views, side views and top views of the bottom cover 5 of the main body.

Among these figures, especially as shown in FIG. 23, the body cover 5 has an oblong switch hole 501 formed on its bottom plate. In this switch hole 501, the light switch 8 (refer FIG. 4) is fitted.

Also as shown in FIG. 24, the body cover 5 has a plurality of ventilation holes 502 formed on the lower side of the cylindrical portion. The ventilation holes 502 are used to allow smoke to flow into the space between the body cover 5 and the middle plate 4 .

Also as shown in FIG. 25 , the body cover 5 has a pair of switch support portions 503A and 503B formed adjacent to the switch hole 501 . The pair of switch supporting parts 503A and 503B have a U-shaped notch, and the shaft of the light switch 8 is embedded in the notch. The above is the description of the main body cover 5 .

The body cover 5 described above is fixed to the body bottom plate 1 while accommodating the body bottom plate 1, the base plate 2, the speaker 3 and the middle plate 4 (see FIG. 4). At this time, an insect-proof net ring 6 is installed on the middle plate 4 contained in the body cover 5 . The insect-proof net ring 6 is more specifically installed in such a way as to surround the air hole 402 of the middle plate 4 and the labyrinth walls 403 to 405.

And the optical table cover 7 is attached so that the lower side opening part of the attached insect screen 6 may be covered. The optical table cover 7 has: a circular plate portion; a star-shaped protruding portion formed on the center of the upper surface of the circular plate portion; and a pair of hooks erected on the peripheral portion of the circular plate portion. When this optical table cover 7 is installed on the middle plate 4, its circular plate portion will cover the lower side opening of the insect-proof net ring 6, and its protruding portion will be inserted between the labyrinth walls 403 to 405 of the middle plate 4. A pair of hooks are locked in a pair of locking holes 406 and 407 of the middle plate 4 .

In addition, a light switch 8 is mounted on the body bottom plate 1 accommodated in the body cover 5 . The light switch 8 has: an oblong plate portion; a protruding portion protruding vertically from one end of the plate portion; a columnar portion vertically erected at the other end of the plate portion; Shaft portion formed on the base end of the portion. Also, the light switch 8 is made of a light-transmitting resin material containing a light-diffusing material. When the light switch 8 is installed on the body bottom plate 1, its protruding part will abut against the inspection switch 207 of the base plate 2, and its columnar part will be inserted between the pair of switch holding parts 110 and 111 of the body bottom plate 1. The shaft portion is inserted into the U-shaped grooves of the pair of switch holding portions 110 and 111 .

As explained above, after installing the insect-proof net 6 , the optical table cover 7 and the light switch 8 , the main body cover 5 is installed on the main body bottom plate 1 . When the body cover 5 is installed on the body bottom plate 1 , the plate portion of the light switch 8 will be embedded in the switch hole 501 . In addition, the shaft portion of the light switch 8 is clamped by a pair of switch supporting parts 503A and 503B of the body cover 5 and a pair of switch holding parts 110 and 111 of the body bottom plate 1 .

1-6. Function Next, the function of the ribs 105 of the body bottom plate 1 will be described. As shown in FIG. 7 , the rib 105 of the main body bottom plate 1 is a ㄇ-shaped rib whose two ends are connected to the outer side of the cylindrical wall 103 . In addition, as shown in FIG. 13 , the lower end of the rib 105 is close to the base plate 2 to the extent that the passage of insects is hindered. For this reason, the rib 105 prevents insects from intruding into the light-receiving unit accommodation space formed between the rib and the cylindrical wall 103 .

As described above, the main body bottom plate 1 has push-in portions 107A and 107B (see FIG. 6 ). U-shaped through-grooves are formed around these push-in portions 107A and 107B, and there is a possibility that insects may enter the device through the U-shaped through-grooves. If insects invade into the device, the insects may enter between the main body bottom plate 1 and the substrate 2 and reach the vicinity of the light receiving portion 206 . At this time, assuming that there is no rib 105 , the insect may enter the optical axis of the light receiving unit 206 and interfere with light receiving by the light receiving unit 206 . If the light receiving by the light receiving unit 206 is hindered, even if a fire occurs, the fire cannot be sensed. As yet another possibility, the possibility that the insects may invade the smoke detection space through the light passage hole 1036 may be considered. If when invading the smoke detecting space, there is a possibility that the light of the light emitting unit 205 hits the insect and scatters, and is received by the light receiving unit 206 . When the scattered light is received by the light receiving unit 206, a fire is sensed even though no fire has actually occurred.

On the other hand, if the ribs 105 are present, the invasion of insects into the light-receiving unit accommodation space can be prevented. For this reason, it is possible to reduce the possibility of missing non-fire alarms or detection of fires caused by the invasion of insects as described above.

Next, the function of the ribs 427 of the middle plate 4 will be described. As shown in FIG. 22 , the rib 427 of the middle plate 4 has a ㄇ-shaped portion 4272 . The ㄇ-shaped portion 4272 is a ㄇ-shaped rib whose two ends abut against the outer side of the cylindrical wall 103 and surround the through hole 217 . In addition, the upper end of the ㄇ-shaped portion 4272 is close to the substrate 2 to the extent that it hinders the passage of insects. For this reason, the ㄇ-shaped portion 4272 is used in the space between the middle plate 4 and the base plate 2 to prevent insects from entering the through hole 217 .

As mentioned above, the main body cover 5 has the ventilation hole 502 (refer FIG. 24). Also, as described above, the middle plate 4 has a display hole 419 (see FIG. 15 ). There is a possibility that insects may invade the space between the middle plate 4 and the base plate 2 through the ventilation holes 502 and the display holes 419 . If an insect invades the space, the insect may enter the space and reach the vicinity of the through hole 217 . At this time, assuming that there is no ㄇ-shaped portion 4272 , the insects may enter the light receiving unit accommodation space through the through hole 217 . If the insect invades into the light receiving unit accommodation space, the light receiving unit 206 may be hindered by the insect. If the light receiving part 206 is hindered, even if a fire occurs, the fire cannot be sensed. As yet another possibility, the possibility that the insects may invade the smoke detection space through the light passage hole 1036 may be considered. If when invading the smoke detecting space, there is a possibility that the light of the light emitting unit 205 hits the insect and scatters, and is received by the light receiving unit 206 . When the scattered light is received by the light receiving unit 206, a fire is sensed even though no fire has actually occurred.

On the other hand, if the ㄇ-shaped portion 4272 is provided, it is possible to prevent insects from entering the through hole 217 . For this reason, it is possible to reduce the possibility of missing non-fire alarms or detection of fires caused by the invasion of insects as described above.

Next, the function of the ribs 428 of the middle plate 4 will be described. As shown in FIG. 22 , the rib 428 of the middle plate 4 has a ㄇ-shaped portion 4282 . The ㄇ-shaped portion 4282 is a ㄇ-shaped rib whose two ends abut against the outer side of the cylindrical wall 103 and surround the through hole 216 . In addition, the upper end of the ㄇ-shaped portion 4282 is close to the substrate 2 to the extent that it hinders the passage of insects. For this reason, the ㄇ-shaped portion 4282 is used in the space between the middle plate 4 and the base plate 2 to prevent insects from entering the through hole 216 .

As mentioned above, the main body cover 5 has the ventilation hole 502 (refer FIG. 24). Also, as described above, the middle plate 4 has a display hole 419 (see FIG. 15 ). There is a possibility that insects may invade the space between the middle plate 4 and the base plate 2 through the ventilation holes 502 and the display holes 419 . If an insect invades the space, the insect may enter the space and reach the vicinity of the through hole 216 . At this time, assuming that there is no ㄇ-shaped portion 4282 , the insects may enter the light emitting unit accommodation space through the through hole 216 . If it invades into the light-emitting part accommodation space, there is a possibility that the light emission of the light-emitting part 205 will be hindered by the insect. If the light emission of the light emitting part 205 is hindered, even if a fire occurs, the fire cannot be sensed. As yet another possibility, the possibility that the insects may invade the smoke detection space through the light passage hole 1035 may be considered. If when invading the smoke detecting space, there is a possibility that the light of the light emitting unit 205 hits the insect and scatters, and is received by the light receiving unit 206 . When the scattered light is received by the light receiving unit 206, a fire is sensed even though no fire has actually occurred.

On the other hand, if the ㄇ-shaped portion 4282 is provided, it is possible to prevent insects from entering the through hole 216 . For this reason, it is possible to reduce the possibility of missing non-fire alarms or detection of fires caused by the invasion of insects as described above.

Next, the function of the hook 1091 formed on the antenna holding portion 109 of the main body bottom plate 1 will be described with reference to FIG. 26 . FIG. 26 referred to in this description is a sectional view taken along line E-E of FIG. 3 . In addition, in this FIG. 26 , hatching is omitted in order to prevent the drawing from being difficult to see.

As shown in the figure, a pinch-off hole 112 is formed right above the hook 1091 . The clamping hole 112 is a hole formed when the main body bottom plate 1 is molded. When the worm has invaded the clamping hole 112, the worm will pass between the inner peripheral surface of the body cover 5 and the outer peripheral surface of the middle plate 4, and reach the body cover 5 as shown by the arrow A1 in the figure. Possibility of the space between the upper surface and the lower surface of the middle plate 4 . But even if this space has been reached, it will still be blocked by the insect-proof net circle 6 and cannot invade the smoke detection space.

On the other hand, assume a case where a hook is formed on the cylindrical wall 103 instead of the antenna holding portion 109 . More specifically, it is assumed that the main body bottom plate 1A is formed by forming the hook 1037 on the cylindrical wall 103 . Fig. 27 is a bottom view of the body bottom plate 1A. In the main body bottom plate 1A shown in the figure, a hook 1037 is formed on the outer side of a wall portion 1032 constituting the cylindrical wall 103 .

Assuming that the position of the hook is changed, a locking hole is formed in the partition wall 426 instead of the side wall 421 of the middle plate 4 . More specifically, it is assumed that the middle plate 4A is formed by forming the locking hole 4261 in the partition wall 426 . FIG. 28 is a top perspective view of the middle plate 4A. In the middle plate 4A shown in the figure, a locking hole 4261 is formed in the center of the partition wall 426 . The hook 1037 is locked in the locking hole 4261 .

Assume a case where the main body bottom plate 1A and the middle plate 4A described above are replaced with the main body bottom plate 1 and the middle plate 4 . More specifically, it is assumed that a smoke detector 100A is provided with a main body bottom plate 1A and a middle plate 4A. FIG. 29 is a longitudinal sectional view of the smoke detector 100A. Note that, in FIG. 29 , hatching is omitted in order to prevent the drawing from being difficult to see.

In the smoke detector 100A shown in the same figure, the clamping hole 113 is formed directly above the hook 1037 . The clamping hole 113 is a hole formed when molding the main body bottom plate 1A. When the worm has invaded the pinch hole 113, the worm will pass between the partition wall 426 and the side wall 421 of the middle plate 4A as shown in the arrow A2 of the figure, and pass through the hole formed under the lock hole 4261. Pinching the hole 429, and invading into the possibility of the insect net circle 6. If insects invade into the insect-proof net circle 6 , the insects may pass between the labyrinth walls 403 to 405 and through the ventilation holes 402 to invade the smoke detection space. If it invades the smoke detection space, there is a possibility that the light of the light emitting unit 205 will be scattered by the insect and be received by the light receiving unit 206 . When the scattered light is received by the light receiving unit 206, a fire is sensed even though no fire actually occurs. As yet another possibility, it may be considered to enter the light emitting part accommodation space from the smoke detection space through the light passage hole 1035 . If it invades into the light-emitting part accommodation space, the light emission of the light-emitting part 205 will be hindered by the insects, and even if a fire occurs, there is a possibility that the fire cannot be sensed. As yet another possibility, it may be considered to enter the light receiving unit accommodation space from the smoke detection space through the light passage hole 1036 . If the insect invades the light receiving unit accommodation space, the light receiving of the light receiving unit 206 will be hindered by the insect, and even if a fire occurs, the fire may not be sensed.

On the other hand, if the hook 1091 is formed in the antenna holding part 109, the clamping hole 112 directly above it will be located outside the insect net 6 in a side view (refer FIG. 26). For this reason, if even the insects have invaded the clamping hole 112, it is not easy to go deep into the insect-proof net ring 6. Therefore, it is possible to reduce the possibility of omission of non-fire alarm or fire detection due to the invasion of insects as described above.

1-7. Action Next, the operation of the smoke detector 100 will be described. Specifically, fire detection processing, fire signal transmission processing, and radio channel setting processing will be described.

First, the fire detection processing will be described. When a fire breaks out in the monitoring area of the smoke detector 100, the smoke of the fire rises toward the ceiling. Then, when it reaches the ceiling, it flows along the ceiling face towards the horizontal. When the smoke flows in from the ventilation hole 502 of the smoke detection sensor 100, the incoming smoke will pass through the insect-proof net ring 6, and through the ventilation hole 402 of the middle plate 4, and flow into the smoke detection space. When it flows into the smoke detection space, the light of the light emitting part 205 will be scattered by the particles of the smoke, and the light will be received by the light receiving part 206 . The light receiving unit 206 outputs a sensing signal to the control circuit 214 when receiving scattered light. When the control circuit 214 receives the sensing signal, the alarm sound will be released from the speaker 3, and the fire signal will be sent from the wireless communication circuit 215 to other smoke detectors 100 or relay devices. The above is the explanation about the fire detection processing.

Secondly, the fire signal transmission processing is explained. When the control circuit 214 of the smoke detector 100 receives a fire signal from another smoke detector 100 , it emits an alarm sound from the speaker 3 . In addition, the control circuit 214 enables the fire signal to be sent from the wireless communication circuit 215 to another smoke detector 100 or a relay device. Thereby, linkage among the smoke detection sensors 100 can be performed.

Next, the radio channel setting process will be described. When the registration switch 209 of the smoke detector 100 is pressed by the user, the control circuit 214 will start the radio channel setting mode (mode). The control circuit 214, in the radio channel setting mode, changes the radio channel according to the short press of the login switch 209 each time. In addition, a guide sound for notifying the number of the radio channel is emitted from the speaker 3 every time the radio channel is changed. The control circuit 214, when the registration switch 209 is long pressed again, will memorize the serial number of the selected radio channel, and end the radio channel setting mode.

Afterwards, when the erasing switch 210 is pressed by the user, the control circuit 214 will erase the number of the memorized radio channel.

2. Variation example The above-mentioned embodiment can also be changed as follows. Furthermore, the following modification examples can also be combined with each other.

2-1. Variation 1 The shape of the main body bottom plate 1 shown in FIG. 6 etc. is an example after all. The shape of the main body bottom plate 1 can also be appropriately changed according to the shapes of the battery mounted on the smoke detector 100 , the substrate 2 and the speaker 3 , or the types of electronic components mounted on the substrate 2 .

2-2. Variation 2 The cylindrical wall 103 of the body bottom plate 1 has an equipod shape as shown in FIG. 6 . However, this shape is only an example, and instead of the equipod shape, for example, it may have a triangular shape.

2-3. Variation 3 The ribs 104 of the main body bottom plate 1 have a substantially U-shaped shape as shown in FIG. 6 . However, this shape is just an example, for example, instead of a substantially ㄇ-shaped shape, it may have a semicircular shape.

The ribs 104 are in contact with the substrate 2 as described above. However, it is not necessary for the ribs 104 to be in contact with the substrate 2 . The ribs 104 may not be in contact with the substrate 2, but a slight gap may be left between them. However, this gap is set to a size that prevents the passage of insects. Specifically, for example, the size of the mesh of the insect net 6 may be substantially the same.

2-4. Variation 4 The ribs 105 of the main body bottom plate 1 have a ㄇ-shaped shape as shown in FIG. 6 . However, this shape is only an example, for example, instead of the ㄇ-shaped shape, it may have a semicircular shape.

Between the rib 105 and the substrate 2, there is a slight gap as described above. However, this gap is not essential. The ribs 105 may be brought into contact with the substrate 2 without leaving a gap between the ribs 105 and the substrate 2 .

2-5. Variation 5 The shape of the board|substrate 2 shown in FIG. 9 etc. is an example after all. The shape of the substrate 2 can also be appropriately changed according to the shape of the battery and the speaker 3 mounted on the smoke detector 100 , or the shape of the cylindrical wall 103 of the main body bottom plate 1 .

2-6. Variation 6 The notch 202 of the base plate 2 abuts against the outer side of the cylindrical wall 103 of the main body bottom plate 1 as described above. However, it is not necessary for the notch portion 202 to be in contact with the outer side of the cylindrical wall 103 . Also, the notch 202 may not abut against the outer side of the cylindrical wall 103, but approach with a slight gap between them. However, the gap at this time is set to a size that prevents passage of insects. Specifically, for example, the size of the mesh of the insect net 6 may be substantially the same.

The pair of notches 203 and 204 of the substrate 2 have a rectangular shape as shown in FIG. 14 . However, this shape is an example after all, and instead of a rectangular shape, it may have a semicircular shape, for example.

2-7. Variation 7 The shape of the middle plate 4 shown in FIG. 15 etc. is an example after all. The shape of the middle plate 4 can also be appropriately changed according to the shapes of the battery mounted on the smoke detector 100 , the substrate 2 and the speaker 3 , or the types of electronic components mounted on the substrate 2 .

2-8. Variation 8 The ㄇ-shaped part 4272 of the rib 427 of the middle plate 4 has a ㄇ-shaped shape as shown in FIG. 22 . However, this shape is only an example, for example, instead of the ㄇ-shaped shape, it may have a semicircular shape.

Between the rib 427 and the substrate 2, there is a slight gap as described above. However, this gap is not essential. The rib 427 may be brought into contact with the substrate 2 without leaving a gap between the rib 427 and the substrate 2 .

2-9. Variation 9 The ㄇ-shaped part 4282 of the rib 428 of the middle plate 4 has a ㄇ-shaped shape as shown in FIG. 22 . However, this shape is only an example, for example, instead of the ㄇ-shaped shape, it may have a semicircular shape.

Between the rib 428 and the substrate 2, there is a slight gap as described above. However, this gap is not essential. The rib 428 may be brought into contact with the substrate 2 without leaving a gap between the rib 428 and the substrate 2 .

2-10. Variation 10 The insect-proof net ring 6 has a cylindrical shape as shown in FIG. 4 . However, this shape is only an example, for example, instead of a cylindrical shape, it may have an elliptical cylindrical shape or an angular cylindrical shape.

2-11. Variation 11 The smoke detector 100 is equipped with a pair of ribs 105 (refer to FIG. 6 ) of the bottom plate of the body and the middle plate 4 in order to reduce the possibility of non-fire alarms or fire detection omissions caused by the intrusion of insects. Ribs 427 and 428 (see FIG. 17 ). However, it is not necessary for the smoke sensor 100 to have all such ribs. Among other ribs, the smoke detector 100 may have only one or two ribs.

1,1A: body bottom plate 2: Substrate 3: Speaker 4,4A: middle plate 5: Body cover 6: Anti-insect net circle 7:Optical table cover 8: Light switch 100,100A: smoke detector 101: battery housing 102: Speaker housing 103: cylindrical wall 104, 105, 427, 428: Ribs 106: Substrate mounting part 107A, 107B: deposit department 108,109,408~415: Antenna holding part 110,111: switch holding part 112,113,429: clip hole 201~204,401: Gap 205: Luminous department 206: Light receiving part 207: Check switch 208: confirmation light 209: Login switch 210: Erase switch 211: Connector 212: Antenna 213: Conductor 214: control circuit 215: wireless communication circuit 216,217: through hole 402, 502: ventilation holes 403~405: Maze wall 406, 407, 422~425, 4261: locking holes 416: Through hole 417: Speaker hole 418,501: switch holes 419: Display hole 420: Antenna hole 421: side wall 426: next door 503A, 503B: switch support part 1021, 1037, 1061, 1062, 1091: Hook 1031~1034: wall 1035, 1036: light through holes 2121,2131: straight line part 2122,2132: arc part

[ FIG. 1 ] A bottom view of a smoke detector 100 . [ FIG. 2 ] A side view of the smoke detector 100 . [ FIG. 3 ] A top view of the smoke detector 100 . [ FIG. 4 ] An exploded perspective view of the smoke detector 100 . [FIG. 5] A sectional view taken along line A-A of FIG. 3. [FIG. [FIG. 6] A bottom view of the bottom plate 1 of the system body. [ FIG. 7 ] A bottom perspective view of the bottom plate 1 of the system body. [ FIG. 8 ] A bottom perspective view of the bottom plate 1 of the system body. [ FIG. 9 ] A bottom view of the system substrate 2 . [ FIG. 10 ] A plan view of the substrate 2 . [ FIG. 11 ] A bottom perspective view of the substrate 2 . [ FIG. 12 ] It is a bottom view of the base plate 2 and the speaker 3 installed on the main body bottom plate 1 . [FIG. 13] It is a side view of the board|substrate 2 and the speaker 3 mounted on the main body bottom board 1. [ Fig. 14 ] is an enlarged view of part B in Fig. 12 . [ Fig. 15 ] A bottom view of the middle plate 4 . [ FIG. 16 ] A bottom perspective view of the middle plate 4 . [ FIG. 17 ] A plan view of the middle plate 4 . [ Fig. 18 ] A top perspective view of the middle plate 4 of the system. [ FIG. 19 ] is a bottom view of the middle plate 4 installed on the bottom plate 1 of the body. [ FIG. 20 ] is a side view of the middle plate 4 installed on the bottom plate 1 of the body. [ Fig. 21 ] is a sectional view taken along line C-C in Fig. 20 . [ Fig. 22 ] is an enlarged view of part D in Fig. 21 . [ FIG. 23 ] A bottom view of the system body cover 5 . [ FIG. 24 ] A side view of the system body cover 5 . [ FIG. 25 ] A plan view of the system body cover 5 . [ Fig. 26 ] It is a sectional view taken along line E-E of Fig. 3 . [FIG. 27] A bottom view of the system body chassis 1A. [ Fig. 28 ] A top perspective view of the middle plate 4A. [FIG. 29] It is a longitudinal sectional view of 100 A of smoke detectors.

1: Body bottom plate

101: battery housing

102: Speaker housing

103: cylindrical wall

104,105: Ribs

106: Substrate mounting part

107A, 107B: deposit department

108,109: Antenna holding part

110,111: switch holding part

1031~1034: wall

1035, 1036: light through holes

1062,1091: hook

Claims (6)

A smoke detector, characterized in that it has: body floor; and a substrate, which is disposed under the body bottom plate substantially parallel to the body bottom plate; The aforementioned body base plate has: a cylindrical wall, which is arranged on the lower surface of the bottom plate of the aforementioned body, and forms a smoke detecting space; and The first rib is connected at both ends to the outer side of the first wall constituting the aforementioned cylindrical wall, and forms a space for accommodating the light-receiving part between the first wall and the first wall, and is used to prevent insects from being accommodated in the light-receiving part. a space intrusion extending from the lower surface of the bottom plate of the body toward the base plate; The aforementioned base plate is such that its end is in contact with or close to the outer side of the aforementioned first wall portion, and covers the aforementioned light-receiving unit accommodating space; A light-emitting part and a light-receiving part are mounted on the upper surface of the aforementioned substrate. The light-emitting part irradiates light into the aforementioned smoke detection space. The first light passes through the hole to receive the light irradiated from the light-emitting part and scattered by the particles of smoke. The smoke detection sensor according to claim 1, further comprising: a middle plate disposed under the substrate substantially parallel to the substrate; The aforementioned substrate has a first notch portion forming a first through hole between the outer side of the aforementioned first wall portion; The above-mentioned middle plate has a second rib, and the two ends of the second rib abut against the outer side of the first wall and surround the first through-hole, and are designed to prevent insects from entering the first through-hole. The upper surface of the middle plate extends toward the base plate. The smoke detector as described in claim 2, wherein the bottom plate of the body further has a third rib, and the third rib is connected at both ends to the outer side of the second wall constituting the aforementioned cylindrical wall, and A light-emitting part accommodating space is formed between the second wall part and extends from the bottom surface of the body bottom plate toward the base plate in order to prevent insects from invading into the light-emitting part accommodating space; The aforementioned base plate is such that its end portion abuts against or is close to the outer side of the aforementioned second wall portion, and covers the aforementioned light-emitting portion accommodating space; The aforementioned base plate further has a second notch portion forming a second through hole between the outer side of the aforementioned second wall portion; The aforementioned light-emitting part is accommodated in the aforementioned light-emitting part accommodation space, and irradiates the light to the aforementioned smoke detection space through the second light passage hole formed on the aforementioned second wall part; The above-mentioned middle plate system further has a fourth rib, and the fourth rib abuts against the outer side of the second wall at both ends, and surrounds the second through hole, and is designed to prevent insects from entering the second through hole. extending from the upper surface of the middle plate toward the base plate. The smoke detection sensor as described in Claim 2 or 3, wherein the aforementioned middle plate is further provided with ventilation holes for allowing smoke to flow into the aforementioned smoke detecting space; It is further equipped with a cylindrical insect-proof net disposed on the lower surface of the aforementioned middle plate in a manner to surround the aforementioned ventilation hole; The above-mentioned body bottom plate is further provided with a hook, the hook is arranged on the lower surface of the above-mentioned body bottom plate, and is arranged at a position outside the above-mentioned insect-proof net when viewed from the side; The above-mentioned middle plate is further provided with a locking hole which is locked by the aforementioned hook arranged on the upper surface thereof. A smoke detector, characterized in that it has: body floor; and a base plate disposed under the body bottom plate substantially parallel to the body bottom plate; and a middle plate, which is arranged substantially parallel to the aforementioned base plate under the aforementioned base plate; The aforementioned body base plate has: a cylindrical wall, which is arranged on the lower surface of the bottom plate of the aforementioned body, and forms a smoke detecting space; and The first rib, its two ends are connected to the outer side of the wall portion constituting the aforementioned cylindrical wall, and forms a space for accommodating the light-emitting part between the aforementioned wall portion; The aforesaid base plate has its end abutted against or close to the outer side of the aforesaid wall and covers the accommodating space of the aforesaid light-emitting part; A light-emitting part and a light-receiving part are mounted on the upper surface of the aforementioned substrate. The light-emitting part is accommodated in the accommodating space of the aforementioned light-emitting part, and irradiates light into the aforementioned smoke detection space through the light passage hole formed on the aforementioned wall part. The light-receiving part The part receives the light irradiated by the aforementioned light-emitting part and scattered by the particles of smoke; The aforementioned base plate has a notch portion forming a through hole between the outer side of the aforementioned wall portion; The above-mentioned middle plate has a second rib, and the two ends of the second rib abut against the outer side of the aforementioned wall and surround the aforementioned through-hole, and are designed to prevent insects from invading the aforementioned through-hole from the upper surface of the aforementioned middle plate. extending toward the aforementioned substrate. A smoke detector, characterized in that it has: The bottom plate of the body has a cylindrical wall forming a smoke detection space on the lower surface; and a substrate disposed under the body bottom plate approximately parallel to the body bottom plate; and The middle plate is disposed under the base plate approximately parallel to the base plate, and has a ventilation hole for allowing smoke to flow into the smoke detection space; and A cylindrical insect-proof net arranged on the lower surface of the aforementioned middle plate in such a manner as to surround the aforementioned ventilation holes; The above-mentioned body bottom plate is further provided with a hook, the hook is arranged on the lower surface of the above-mentioned body bottom plate, and is arranged at a position outside the above-mentioned insect-proof net when viewed from the side; A light-emitting part and a light-receiving part are mounted on the upper surface of the aforementioned substrate. The light-emitting part irradiates light into the aforementioned smoke detection space, and the light-receiving part receives the light irradiated from the aforementioned light-emitting part and scattered by the particles of smoke. ; The above-mentioned middle plate is further provided with a locking hole which is locked by the aforementioned hook arranged on the upper surface thereof.

Images