JP2000194966A - Fire sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire sensor without the need of opening a large hole at an installed position, capable of easily draining water and without causing any failure due to water even when water infiltrates in the sensor in the fire sensor to be installed as integrated structure at the installed position such as ceiling. SOLUTION: This fire sensor 1 is provided with a housing part 15 in which a circuit board 30 to detect a fire is housed and a frame part 12 provided in the periphery of the housing part 15. Upper surfaces of the housing part 15 and the frame part 12 are provided in almost the same plane, and further lead wires 31 extending from the circuit board 30 extends, upward while detouring the outside of an edge part of the circuit board 30 from the lower side of the circuit board 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire detector which can be attached to a mounting point such as a ceiling without being attached to a detachable and separately provided sensor base.

[0002]

2. Description of the Related Art Fire detectors are of a type that can be attached to a mounting point such as a ceiling via a detachable and separately provided sensor base, and a type that is directly attached to a mounting point without a sensor base. There are types that can be used. The sensor base has a lead wire connected to a line arranged from the receiver to the mounting location, and a terminal piece electrically connected to the fire detector. The fire detector is fixed to the mounting location and the fire detector is fixed. The sensor and the line are electrically connected. In the type of sensor that is mounted via the sensor base, the thickness of the sensor base itself increases, so the amount of protrusion from the mounting location (for example, the ceiling) increases. Spawn. In addition, there may be a case where a sensor of a type that does not protrude so much from a mounting location for various reasons as well as a feeling of pressure in a space is desired. The type of sensor that can be installed without the intermediary of the sensor base has no sensor base,
This has the advantage that the amount of protrusion from the mounting point can be made relatively small.

FIG. 8 shows a side view of an example of a conventional sensor without a sensor base. A conventional sensor 80 without a sensor base includes an accommodating portion 81 for accommodating an electronic substrate on which a sensing circuit for detecting heat and smoke is mounted, and a surrounding portion of the accommodating portion 81 for attaching the sensor to a mounting portion. And a frame portion 82 and the like protruding therefrom.

[0004]

As shown in FIG. 8, a conventional sensor 80 which does not pass through a sensor base has a housing 81 as shown in FIG.
Is provided one step higher than the frame part 82,
When mounting on a ceiling or other mounting location, the accommodation section 8
The workability was not good because a hole had to be made to allow the upper part of 1 to enter. In addition, because of the large hole, when the sensor was removed and returned to its original state, the repair work was difficult.

FIG. 9 is a longitudinal sectional view of a conventional sensor 80 without a sensor base. A conventional sensor 80 without a sensor base includes an opening 81B for accommodating a substrate or the like at an upper portion of an accommodation portion 81, and a lid 81 for closing the opening 81B.
A is provided. Generally, the lid of such a sensor is provided with an opening 81B so as to cover the opening 81B from the outside.
And a type that closes the opening 81B by fitting it inside the opening 81B as shown in FIG. Since the sensor 80 that does not pass through the sensor base is directly attached to a mounting point such as a ceiling, for example, when the sensor 80 is installed in a place where a large amount of water such as rainwater or dew is generated, water flows from above the ceiling to the upper part of the sensor. At this time, the lid 81A at the top of the detector 80
Is a type that fits inside the opening 81B.
Water enters the inside of the sensor 80 from between A and the opening 81B. Even if the lid is of a type that covers from outside the opening 81B, the sensor 80 that does not pass through the sensor base is
Since a lead wire for connecting to the line extends from the inside of the sensor 80 to the outside, water enters the sensor 80 through the lead wire. For this reason, in the past, when the sensor was installed in a location where water is frequently generated, processing such as sealing the lid with an adhesive was performed, but once the lid is sealed, the sensor is replaced by maintenance and inspection. It is inconvenient to handle the sensor, for example, it cannot be disassembled even if it is necessary to disassemble it.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and in a fire detector which can be attached to an attachment point such as a ceiling in an integrated configuration, it is not necessary to make a large hole in the attachment point, and furthermore, it is possible to detect a fire. It is an object of the present invention to provide a fire detector that does not cause any trouble even when water enters the inside of the vessel and that can easily drain even when installed in a place where water is frequently generated.

[0007]

In order to solve the above-mentioned problems, the invention according to the first aspect of the present invention is an integral part of a mounting portion such as a ceiling without a removable sensor base provided separately. A fire detector which is mounted as it is, comprising a housing for housing a sensing means for detecting a fire in plan view, and a frame provided around the housing and fixed to a mounting location, The upper side of the housing portion and the frame portion is provided in substantially the same plane, with the side attached to the upper side facing upward.

According to the first aspect of the present invention, since the fire detector is directly attached to the mounting location without the need for the detector base, the amount of protrusion due to the installation of the fire detector can be reduced. In addition, since the upper surfaces of the housing portion and the frame portion are provided in substantially the same plane, the hole provided at the mounting location when the fire detector is mounted can be made smaller than before. That is, unlike the related art, a hole for passing the upper portion of the housing is not required, and only a hole for passing the lead wire extending from the fire detector may be provided.

According to a second aspect of the present invention, in the fire detector according to the first aspect, an opening for accommodating the sensing means and a lid for closing the opening are provided at an upper portion of the accommodation section. A locking portion for locking the lid is provided inside the opening, and the lid is fitted inside the opening to close the opening. According to the second aspect of the present invention, since the lid is fitted inside the opening, a configuration in which the upper surfaces of the frame portion and the housing portion are substantially coplanar can be easily realized with a simple structure.

Specifically, as in the invention according to claim 3, in the fire detector according to claim 2, the lid has a radial direction at least at two locations on an outer peripheral portion of the lid and lower than the upper surface. A locking piece protruding from the cover, and a locking claw provided at least at a position lower than the upper surface of the lid.
The opening is provided with a locking portion for receiving and locking the locking piece of the lid and a locking portion for locking the locking claw of the lid, so that the lid fits inside the opening. The combined and locked configuration can be realized with a simple structure.

According to a fourth aspect of the present invention, in the fire detector according to any one of the first to third aspects, an opening for accommodating the sensing means is provided at an upper portion of the accommodation section, and a lid for closing the opening. And a leg for supporting the substrate of the sensing means from below is provided in the housing portion, and the lid is provided with a pressing portion for pressing the substrate of the sensing means from above, and The substrate of the means is sandwiched and fixed between the leg portion and the pressing portion. According to the fourth aspect of the present invention, after the substrate of the sensing means is accommodated in the accommodating portion, the substrate is fixed only by closing the lid, so that the assembling work of the fire detector can be facilitated.

According to a fifth aspect of the present invention, in the fire detector according to the fourth aspect, a lens for an indicator lamp exposed to the outside is provided below the housing portion, and the lens supports the substrate. The configuration also serves as the leg. According to the fifth aspect of the present invention, since the substrate is supported by the lens, the substrate can be supported more stably, and the configuration can be made compact because the lens also serves as the leg.

According to a sixth aspect of the present invention, there is provided a housing for accommodating a fire detecting means, and a frame portion provided around the housing and fixed to a mounting portion. In a fire detector that is attached to a mounting point such as a ceiling without being interposed via a sensor base provided on a body, the sensing means includes a substrate and one side of the substrate to the outside of the fire detector. The board is accommodated with the one surface side facing downward, with the one where the fire detector is attached to the mounting location as the upper side, and the lead wire is provided on the edge of the board from the lower side of the board. It is configured to extend upward bypassing the outside of the part.

According to the sixth aspect of the present invention, water that enters the inside of the sensor by connecting the lead wire is prevented from reaching the substrate and is avoided below the substrate. Therefore, even when water enters the inside of the sensor, the water can be drained without affecting the substrate. Further, when the lead wire is bypassed when the substrate is set in the accommodation portion, the lead wire can be fitted into the inner wall (for example, a groove) of the accommodation portion and the substrate can be temporarily fixed. Thereby, the assembling work and the disassembling work of the fire detector become easy.

According to a seventh aspect of the present invention, in the fire detector according to the sixth aspect, an opening for accommodating the sensing means and a lid for closing the opening are provided at an upper portion of the accommodation section. A groove portion is formed in each of the opening and the lid, and the lead wire is sandwiched between the groove of the opening and the groove of the lid and passed to the outside. According to the invention described in claim 7, the lead wire is passed through the groove between both the opening and the lid, so that the lead wire can be easily assembled from the inside of the sensor without forming a gap around the lead wire. Lead wires can be passed outside.

According to an eighth aspect of the present invention, in the fire detector according to any one of the first to seventh aspects, a through hole for drainage is provided at the bottom of the housing portion to penetrate to the outside. And According to the invention of claim 8, even when water enters the inside of the fire detector, the water can be discharged from the through hole for draining, and the water accumulates in the detector. Inconvenience can be avoided.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. FIG.
1 is an exploded perspective view of a fire detector 1 according to an embodiment of the present invention. 2A and 2B show the main body case 10 of the fire detector 1, wherein FIG. 2A is a plan view thereof, FIG. 2B is a perspective view, and FIG. 3 shows a circuit board 30 of the fire detector 1. a) is a bottom view, (b) is a top view, and FIG. 4 is a lid 4 of the fire detector 1.
0 is shown, (a) is a top view and (b) is a bottom view.

The fire detector 1 of this embodiment is of a type that can be directly and integrally mounted on a mounting point such as a ceiling without passing through a mounting base connected to a line. As shown in FIG.
0, a board 30 provided with a sensing circuit (sensing means) for sensing heat and the like, a lid 40, a protector attached to the lower side of the main body case 10, and the like. The main body case 10 includes a central housing portion 15 that houses the circuit board 30,
And a frame portion 12 for fixing the sensor that protrudes around the accommodation portion 15.

The accommodation portion 15 has an opening at the upper surface, and a through hole 16 for exposing a thermistor disposed on the substrate 30 to the outside, a lens hole 17, and a leg (leg portion) 1.
8, a groove 24 for taking out the lead wire 31 connected to the substrate 30 to the outside, and a hooking piece (hooking portion) 25 for hooking the locking claw 41 of the lid 40 are provided. I have. Further, inside the opening of the housing portion 15, a step portion 29 on which the lid 40 is placed and positioned, and a locking piece 4 of the lid 40 are provided.
Two locking portions 28, 2 into which the first and second locking members 42 are inserted and locked.
8 are formed.

The bottom of the housing 15 is provided with drain holes 19, 20,..., 21 for draining water.
... are provided. Of these, the through holes 20 are provided below the grooves 24. The leg pieces 18 are the substrate 3
0, which are provided at positions corresponding to the three corners, support the substrate 30 with a flat portion, and
And the substrate 30 is positioned.

The lens hole 17 is a hole through which the lens 13 for guiding the light of the indicator lamp on the substrate 30 to the outside passes, and has an inner diameter formed so that the lens 13 can be fitted without looseness. Around the lens hole 17, a concave portion 17a in which the flange portion 13a of the lens 13 is accommodated, and a wall portion 17b surrounding the lens 13 are provided. The lens 13 is fitted and fixed in the lens hole 17. When the lens 13 is fitted into the lens hole 17, the upper portion of the lens 13 is at the same height as the lower surface of the substrate 30, and the lens 13 also serves as a leg supporting the substrate 30 from below. . When the lens 13 supports the substrate 30, the light emitting element on the substrate 30 is avoided in the concave portion 13 b above the lens 13.

The engaging piece 25 is formed in a shape corresponding to the hook-shaped engaging claw 41 so that the engaging claw 41 will not come off unless the engaging claw 41 is moved. An opening 26 for removing the locking claw 41 is provided below the hooking piece 25. For example, a pointed object such as a screwdriver is inserted through the opening 26 to apply force to the locking claw 41. Thus, the locking between the locking claw 41 and the locking piece 25 is released. The frame portion 12 is formed such that its upper surface is located on the same plane as the upper surface of the housing portion 15 (the upper surface of the lid 40). The frame portion 12 has a plurality of screw insertion holes 12a, 12a, 12a so that the frame portion 12 can be directly attached to a mounting point such as a ceiling.
b, 12b, 12c, and 12c are provided.

As shown in FIG. 3, an integrated circuit (not shown) for detecting a fire and a light emitting element 35 for an indicator light which emits light when a fire is detected are provided on the substrate 30 as shown in FIG. The lead wires 31 with connectors for connecting the fire detector 1 to a detector line extending from the receiver or a test line for testing the fire detector 1 are connected to the electrodes 38. These lead wires 31 are connected so as to extend from the lower surface side of the substrate 30. Also, an electrode hole 39 at the center of the substrate 30
Is connected to a heat detecting element (such as a thermistor). In addition, the substrate 30 is provided with positioning grooves 33 for inserting the inclined portions of the legs 18 of the housing portion 15 at three corners, respectively. Since the positioning grooves 33 are not symmetrical, it is possible to avoid the problem that the front and back of the substrate 30 are set incorrectly.

The lid 40 fits inside the opening of the housing portion 15 to close the opening, and the groove 24 of the opening is formed.
Are provided at positions corresponding to... Which are engaged with these grooves 24. Grooves 45 for passing the lead wires 31 are also provided on the distal ends of the convex portions 46. The groove 24 of the housing 15 and the groove 45 of the lid 40 are provided.
The lead wires 31 extend to the outside without a gap with the lead wire 31 interposed therebetween. Further, on the outer peripheral portion of the lid 40, two locking pieces 42, 42 projecting in the radial direction at positions one step lower than the upper surface are provided. In addition, lid 4
On the lower surface of 0, a locking claw 41 to be hooked on the hooking piece 25 of the housing portion 15, a pressing portion 43 for pressing the substrate 30 from above,.
Is provided.

Next, an assembly structure of the fire detector 1 having the above configuration will be described. FIG. 5 is a top view showing a state in which the board 30 is set in the main body case 10, and FIG. 6 is a top view showing a state in which the board 30 and the lid 40 are set in the main body case 10. In FIG. 5 and FIG. 6, illustration of the lead wires 31 is omitted. The assembling of the main body case 10 and the substrate 30 is simply performed by accommodating the groove portions 33 at the three corners of the substrate 30 together with the leg pieces 18 in the accommodating portion 15 and does not require fixing such as screwing. The lead wires 31 extending from the lower surface of the substrate 30 bypass the outside of the substrate 30 and pass through the groove 24 to the outside. In this state,
By fitting the lead wires 31 into the grooves, the substrate 30 is temporarily fixed so that the substrate 30 does not come off even if the main body case 10 is turned upside down.

The assembly of the main body case 10 and the lid 40 is as follows.
First, after the locking pieces 42, 42 of the lid 40 are inserted into the locking portions 28, 28 of the main body case 10, the lid 40 is
This is completed by pushing the locking claw 41 into the engaging piece 25 of the main body case 10 by pushing it into the opening of No. 0. In this state, the lid 40 is placed on the step portion 29 of the accommodation portion 15 and at the same time,
The locking pieces 42, 42 are used as locking portions 28, 28 of the accommodation portion 15.
Then, the locking claws 41 are respectively locked and fixed to the locking pieces 25 of the housing portion 15.

FIGS. 7A and 7B show three longitudinal sections of the fire detector of FIG. 6, wherein FIG. 7A is a sectional view taken along the line AA of FIG. 6, and FIG.
Is a cross-sectional view taken along line BB, and (c) is a cross-sectional view taken along line CC. As shown in the figure, when the lid 40 is assembled,
The board 30 is pressed and fixed between the holding portions 43 of the lid 40 and the upper portions of the legs 18 or the lens 13 of the main body case 10. The groove 24 of the main body case 10
The lead wire 31 is sandwiched and fixed without any gap by the groove portion 45 of the lid 40. FIG.
As shown in (b), since the lead wire 31 extends from the lower surface of the substrate 30 to the outside along the groove 24, bypassing the outside of the substrate 30, when water invades through the lead wire 31. However, water is prevented from resting on the substrate 30. Further, since the through hole 20 for draining water is provided below the groove 24, the water passing through the lead wire 31 is discharged to the outside from the through hole 20.

As described above, according to the fire detector 1 of this embodiment, the fire detector 1 can be directly attached to the mounting location without the need for the detector base.
The amount of protrusion due to the installation of can be reduced. In addition, since the upper surfaces of the housing portion 15 and the frame portion 12 are provided on substantially the same plane, the hole provided at the mounting location when the fire detector 1 is mounted can be made smaller than before. That is, there is no need for a hole for inserting the upper portion of the housing portion as in the conventional case, and the lead wire 31 extending from the fire detector 1 is not required.
It is sufficient to provide only holes for passing through.

A cover 40 for closing the opening of the housing 15
Since it is configured to be fitted inside the opening to close the opening, a configuration in which the upper surfaces of the frame portion 12 and the housing portion 15 are substantially coplanar can be easily realized with a simple structure. Further, while the locking pieces 42, 42 and the locking claw 41 are provided on the lid 40, the locking sections 28, 28 for receiving and locking the locking pieces 42, 42 of the lid 40 in the opening of the housing 15. By providing the locking piece 25 on which the locking claw 41 of the lid 40 is locked, a configuration in which the lid 40 is fitted and locked inside the opening can be realized with a simple structure.

The board 30 is connected to the leg 18 in the housing 15.
And is supported by the lens 13 from the lower side, and is pressed down and fixed to the pressing portion 43 of the lid 40 from above.
The work of assembling the fire detector 1 can be facilitated. Further, since the lens 13 also serves as a leg for supporting the substrate, the substrate 30 can be more stably supported and the configuration can be made more compact.

Also, since the lead wires 31 extend upward from the lower side of the substrate 30 bypassing the outside of the edge of the substrate 30, water entering through the lead wires 31. It can be prevented from getting on. Also, even if water enters the inside of the fire detector 1, the through holes 19 for draining water ...
Water can be discharged from 20 ..., 21 ..., and the inconvenience that water accumulates in the fire detector 1 can be avoided.

Further, the lead wires 31... Detour outside the edge of the substrate 30, so that the lead wires 31... Act like a spring, and the substrate 30 can be temporarily fixed by this action. Thereby, the assembling work and the disassembling work of the fire detector become easy. Also, the lead wires 31...
, 45 provided in both the opening and the lid 40
, Which are passed through to the outside, so that the lead wires 31 can be easily assembled without forming a gap around the lead wires 31.
Can be passed through.

The fire detector according to the present invention is not limited to the fire detector 1 according to this embodiment. For example, the fire detector 1 that electrically senses heat has been described as a fire detector, but the present invention can also be applied to a type that senses smoke or a type that senses heat mechanically using thermal expansion. In addition, the arrangement and shape of the legs for supporting the substrate, the lead wires 31
The specific structure described in the present embodiment, such as the arrangement and shape of the grooves 24 through which the holes pass, the arrangement of the through holes for discharging water, and the locking structure between the lid and the housing portion, does not depart from the spirit of the invention Can be changed as appropriate.

[0034]

According to the first aspect of the present invention, since the fire detector is directly attached to the mounting location without the need for the sensor base, the amount of protrusion due to the installation of the fire detector can be reduced. In addition, since the upper surfaces of the housing portion and the frame portion are provided in substantially the same plane, the hole provided at the mounting location when the fire detector is mounted can be made smaller than before. That is, unlike the related art, a hole for passing the upper portion of the housing is not required, and only a hole for passing the lead wire extending from the fire detector may be provided.

According to the second aspect of the present invention, the lid for closing the opening provided in the upper portion of the housing is fitted inside the opening to close the opening. The same plane configuration can be easily realized with a simple structure.

According to the third aspect of the present invention, while the locking piece and the locking claw are provided on the lid, the locking section for storing and locking the locking piece of the lid in the opening of the housing section, With the provision of the latching portion on which the latching claw is latched, a configuration in which the lid is fitted and locked inside the opening can be realized with a simple structure.

According to the fourth aspect of the present invention, since the substrate of the sensing means is supported by the legs in the housing from below and fixed by being pressed from above by the holding portion of the lid, fire detection is possible. The work of assembling the container can be facilitated.

According to the fifth aspect of the present invention, since the substrate is supported by the lens, the substrate can be more stably supported, and the structure can be made compact because the lens also serves as the leg. .

According to the sixth aspect of the present invention, since the lead wire extends upward from the lower side of the substrate, bypassing the outside of the edge of the substrate, the lead wire enters the sensor through the lead wire. Even if water enters the sensor without flowing onto the substrate, it can be drained without affecting the substrate. Further, when the lead wire is bypassed when the substrate is set in the accommodation portion, the lead wire can be fitted into the inner wall (for example, a groove) of the accommodation portion and the substrate can be temporarily fixed. Thereby, the assembling work and the disassembling work of the fire detector become easy.

According to the seventh aspect of the present invention, since the lead wire is inserted into the groove provided in both the opening of the housing portion and the lid and is passed outside, it is assembled without forming a gap around the lead wire. A lead wire can be easily passed from the inside of the sensor to the outside.

According to the eighth aspect of the present invention, even when water enters the inside of the fire detector, the water can be discharged from the through hole for draining, and if water accumulates in the detector. Such inconveniences can be avoided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a fire detector according to an embodiment of the present invention.

FIG. 2 shows the main body case of the fire detector.
(A) is a plan view and (b) is a perspective view.

FIG. 3 shows a circuit board of the fire detector.
(A) is a bottom view, and (b) is a top view.

4A and 4B show a lid of the fire detector, wherein FIG. 4A is a top view and FIG. 4B is a bottom view.

FIG. 5 is a top view showing a state where a circuit board is set on a main body case in the fire detector.

FIG. 6 is a top view showing a state where a circuit board and a lid are set on a main body case in the fire detector.

FIGS. 7A and 7B show three vertical cross sections of the fire detector of FIG. 6, wherein FIG. 7A is a cross-sectional view taken along the line AA, and FIG.
FIG. 3C is a cross-sectional view taken along line CC of FIG.

FIG. 8 is a side view showing a conventional fire detector without a mounting base.

FIG. 9 is a longitudinal sectional view showing the conventional fire detector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fire detector 10 Main body case 12 Frame part 13 Lens 15 Housing part 18 ... Leg piece (leg part) 19 ..., 20 ..., 21 ... Through-hole for water discharge 24 ... Groove part 25 Hook piece 28, 28 Locking part 29 Step 30 Substrate 31 Lead wire 33 Groove 40 Lid 41 Locking claw 42, 42 Locking piece 43 Locking part

Claims (8)

[Claims] 1. A fire detector for detecting a fire in a plan view, wherein the fire detector is detachably attached to a mounting point such as a ceiling without being interposed via a separately provided sensor base. And a frame portion provided around the housing portion and fixed to a mounting portion, and the upper surface of the housing portion and the frame portion is substantially A fire detector characterized by being provided on the same plane. 2. An opening for accommodating the sensing means and a lid for closing the opening are provided at an upper portion of the accommodation portion, and a locking portion for locking the lid is provided inside the opening. The fire detector according to claim 1, wherein the lid is fitted inside the opening to close the opening. 3. The lid has at least two locking pieces radially protruding from the outer periphery of the lid and lower than the upper surface, and locking at least one lower position from the upper surface of the lid. While a claw is provided, the opening includes a locking portion that receives and locks the locking piece of the lid, and a locking portion that locks the locking claw of the lid. 3. The fire detector according to claim 2, wherein the fire detector is provided. 4. An opening for accommodating the sensing means and a lid for closing the opening are provided in an upper part of the accommodation part, and a leg for supporting the substrate of the sensing means from below is provided in the accommodation part. While the portion is provided, the lid is provided with a pressing portion for pressing the substrate of the sensing means from above, and the substrate of the sensing means is fixedly held between the leg and the pressing portion. The fire detector according to claim 1. 5. The display device according to claim 4, wherein a lens for an indicator lamp exposed to the outside is provided below the housing, and the lens also serves as the leg supporting the substrate. Fire detector. 6. A detachable and separately provided sensing portion having a housing portion in which a fire detecting means is housed, and a frame portion provided around the housing portion and fixed to a mounting portion. In a fire detector which is attached to a mounting point such as a ceiling without being interposed through a device base, the sensing means comprises a substrate and a lead wire extending from one surface of the substrate to the outside of the fire detector. The board is accommodated with the one surface side facing downward, with the side where the fire detector is attached to the attachment point as the upper side, and the lead wire detours from the lower side of the board to the outside of the edge of the board. A fire detector characterized by extending upward. 7. An opening for accommodating the sensing means and a lid for closing the opening are provided at an upper portion of the accommodation section, and a groove is formed in each of the opening and the lid, and the lead wire is connected to the opening. 7. The fire detector according to claim 6, wherein the fire detector is sandwiched between the groove of the opening and the groove of the lid and is passed outside. 8. The fire detector according to claim 1, wherein a drain hole is provided at the bottom of the housing part to drain to the outside.