Alarm

Abstract

An alarm according to the present disclosure comprises: a refrigerant sensor capable of detecting a refrigerant; a notification element capable of providing notification that the refrigerant sensor has detected the refrigerant; a sensor substrate to which the refrigerant sensor is attached; a housing that accommodates the sensor substrate in the interior thereof; and an inner member accommodated in the interior of the housing. The housing includes a cover wall portion that covers the sensor substrate and the refrigerant sensor. In the cover wall portion, a slit is formed extending in one direction and connecting the exterior of the housing and the interior of the housing. The inner member includes an opposing wall portion disposed facing the slit, and a first protruding wall portion protruding from the opposing wall portion toward the cover wall portion and extending in an extension direction in which the slit extends. On an inner-side surface of the housing of the cover wall portion, a second protruding wall portion is formed that protrudes toward the opposing wall portion from an edge portion of a peripheral edge portion of the slit, the edge portion being in an intersecting direction intersecting the extension direction, and extends in the extension direction. The first protruding wall portion and the second protruding wall portion include portions overlapping each other when viewed in the intersecting direction.

Description

[Technical field]

[0001] The present disclosure relates to an alarm. [Background technology]

[0002] For example, as disclosed in Patent Document 1, a refrigerant leak detector (alarm) is known that detects a refrigerant and issues an alarm when a refrigerant leaks. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-193884 A Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned refrigerant leak detector detects the refrigerant that has flowed into the housing through a slit formed in the housing using a refrigerant sensor provided inside the housing. Therefore, there is a risk that liquid such as water may enter the housing through the slit and come into contact with electronic components housed in the housing. This may cause malfunctions in the electronic components.

[0005] In view of the above circumstances, an object of the present disclosure is to provide an alarm having a structure that can suppress malfunctions in electronic components housed inside a housing. [Means for solving the problem]

[0006] One aspect of an alarm according to the present disclosure includes a refrigerant sensor capable of detecting a refrigerant, an alarm element capable of notifying that the refrigerant sensor has detected the refrigerant, a sensor board to which the refrigerant sensor is attached, a housing that houses the sensor board, and an inner member housed inside the housing, the housing having a cover wall portion that covers the sensor board and the refrigerant sensor, the cover wall portion having a wall extending in one direction and connecting the outside of the housing to the inside of the housing. Multiple A slit is formed in the inner member. Multiple The cover wall has an opposing wall portion disposed opposite the slit, and a first protruding wall portion protruding from the opposing wall portion toward the cover wall portion and extending in the extension direction of the slit. The cover wall has a surface on the inner side of the housing, Multiple Slit Each The peripheral portion protrudes from an edge portion in a direction intersecting the extension direction toward the opposing wall portion and extends in the extension direction. Multiple A second protruding wall portion is formed, and the first protruding wall portion and the Multiple 2nd protruding wall part Each of has portions that overlap each other when viewed in the intersecting direction. Effect of the Invention

[0007] According to the present disclosure, in an alarm device, malfunctions in electronic components housed inside a housing can be suppressed. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a perspective view showing an alarm device according to an embodiment. [Diagram 2] FIG. 2 is a front view of the alarm device according to the embodiment. [Diagram 3] FIG. 2 is an exploded perspective view showing the alarm device according to the embodiment. [Figure 4] 1 is a perspective view showing a part of an alarm device according to an embodiment, with a lid portion, an inner member, a button member, and a transparent member removed; FIG. [Diagram 5]FIG. 2 is a front view of a portion of the alarm device according to the embodiment, showing the state in which the lid portion, the inner member, the button member, and the transparent member have been removed. [Figure 6] 6 is a cross-sectional view showing the alarm device in the embodiment, taken along line VI-VI in FIG. 2. [Figure 7] 7 is a cross-sectional view showing the alarm device in the embodiment, taken along line VII-VII in FIG. 2. [Figure 8] 8 is a cross-sectional view showing the alarm device in the embodiment, taken along line VIII-VIII in FIG. 2. [Figure 9] FIG. 2 is a perspective view showing a lid portion in the embodiment. [Figure 10] FIG. 2 is a perspective view showing an inner member in the embodiment. [Figure 11] 11 is a perspective view showing an inner member in the embodiment, seen from an angle different from that in FIG. 10. FIG. [Figure 12] FIG. 4 is a cross-sectional view showing an inner member in the embodiment. [Figure 13] FIG. 2 is a perspective view showing a button member according to the embodiment. [Figure 14] 14 is a perspective view showing the button member in the embodiment, as viewed from an angle different from that in FIG. 13. FIG. [Figure 15] 4 is a cross-sectional view showing a state in which the button member is pressed in the embodiment. FIG. [Figure 16] FIG. 2 is a perspective view showing a transmissive member in the embodiment. [Figure 17] 17 is a perspective view showing a transparent member in the embodiment, as viewed from an angle different from that in FIG. 16. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. Note that the scope of the present disclosure is not limited to the following embodiment, and can be changed as desired within the scope of the technical idea of ​​the present disclosure. In addition, in the following drawings, the scale and number of each structure may be different from the scale and number of the actual structure in order to make each configuration easier to understand.

[0010] In addition, the drawings show the X-axis, Y-axis, and Z-axis as appropriate. In the following description, the direction along the X-axis is called the "front-rear direction X", the direction along the Y-axis is called the "left-right direction Y", and the direction along the Z-axis is called the "up-down direction Z". The front-rear direction X, the left-right direction Y, and the up-down direction Z are mutually perpendicular directions. In the following description, the side (+Z side) of the up-down direction Z toward which the arrow of the Z-axis faces is the upper side, and the opposite side (-Z side) of the up-down direction Z to the side toward which the arrow of the Z-axis faces is the lower side. In addition, the side (+X side) of the front-rear direction X toward which the arrow of the X-axis faces is the front side, and the opposite side (-X side) of the front-rear direction X to the side toward which the arrow of the X-axis faces is the rear side. In addition, the left-right direction Y is the left-right direction when the alarm device 100 of the following embodiment is viewed from the front side (+X side). In other words, the side in the left-right direction Y toward which the Y-axis arrow points (+Y side) is defined as the right side, and the side opposite to the side in the left-right direction Y toward which the Y-axis arrow points (-Y side) is defined as the left side.

[0011] In the following embodiment, the vertical direction Z corresponds to the extension direction in which slits 33, which will be described later, extend. The left-right direction Y corresponds to the intersecting direction that intersects with the extension direction. The alarm device 100 in the following embodiment is disposed so that the vertical direction Z is parallel to the vertical direction. In other words, the upper side of the vertical direction Z is the upper side in the vertical direction, and the lower side of the vertical direction Z is the lower side in the vertical direction.

[0012] FIG. 1 is a perspective view showing an alarm 100 in this embodiment. FIG. 2 is a view of the alarm 100 in this embodiment as viewed from the front (+X side). FIG. 3 is an exploded perspective view showing the alarm 100 in this embodiment. FIG. 4 is a perspective view showing a part of the alarm 100 in this embodiment, showing a state in which a lid portion 30, an inner member 60, a button member 70, and a transparent member 80, which will be described later, have been removed. FIG. 5 is a front view of a part of the alarm 100 in this embodiment, showing a state in which a lid portion 30, an inner member 60, a button member 70, and a transparent member 80, which will be described later, have been removed. FIG. 6 is a cross-sectional view showing the alarm 100 in this embodiment, taken along the line VI-VI in FIG. 2. FIG. 7 is a cross-sectional view showing the alarm 100 in this embodiment, taken along the line VII-VII in FIG. 2. FIG. 8 is a cross-sectional view showing the alarm 100 in this embodiment, taken along the line VIII-VIII in FIG. 2.

[0013] The alarm 100 in this embodiment shown in Fig. 1 is an alarm that detects a refrigerant and, when a refrigerant is detected, notifies a user or the like that a refrigerant has been detected. The refrigerant is, for example, a refrigerant used in a refrigeration cycle device such as an air conditioner. Examples of the refrigerant include fluorine-based refrigerants and hydrocarbon-based refrigerants that have a low global warming potential (GWP). The density of the refrigerant in gaseous form is greater than the density of air. The alarm 100 is fixed, for example, to a wall in a room where an indoor unit of the air conditioner is placed.

[0014] As shown in FIG. 1, the alarm 100 in this embodiment has a substantially rectangular parallelepiped shape. As shown in FIG. 2, the alarm 100 has a substantially square shape having a pair of sides extending in the left-right direction Y and a pair of sides extending in the up-down direction Z when viewed in the front-rear direction X. The alarm 100 includes a housing 10 having a substantially rectangular parallelepiped box shape. The housing 10 is made of, for example, resin. As shown in FIG. 1, the housing 10 has a housing main body 20 and a lid 30. The housing main body 20 and the lid 30 are separate from each other. The lid 30 is located on the front side (+X side) of the housing main body 20. The lid 30 is detachably fixed to the housing main body 20.

[0015] As shown in FIG. 3, the housing main body 20 is box-shaped and opens to the front side (+X side). The housing main body 20 has a rear wall 21, an inner peripheral wall 22, and a flange 23. The rear wall 21 is substantially square plate-shaped. The plate surface of the rear wall 21 faces the front-rear direction X. The inner peripheral wall 22 protrudes forward from the outer edge of the rear wall 21. The inner peripheral wall 22 is substantially square frame-shaped when viewed in the front-rear direction X. A hole 22a is formed in the center of the upper wall of the inner peripheral wall 22 in the left-right direction Y, penetrating the wall in the up-down direction Z. The flange 23 protrudes from the outer peripheral surface of the inner peripheral wall 22 toward the outside of the inner peripheral wall 22. The flange 23 is substantially square frame-shaped surrounding the inner peripheral wall 22.

[0016] A lid fixing portion 21a is formed in the center of the upper edge of the rear wall portion 21 in the left-right direction Y. The lid fixing portion 21a protrudes forward and upward from the front (+X side) surface of the rear wall portion 21. The lid fixing portion 21a is disposed facing the lower side of the hole portion 22a. A bolt for fixing the lid portion 30 is fastened into the lid fixing portion 21a. The housing main body portion 20 and the lid portion 30 are fixed to each other by the bolt.

[0017] A pair of partition walls 26a, 26b are formed in the center of both edges in the left-right direction Y of the front (+X) surface of the rear wall 21 in the up-down direction Z. The pair of partition walls 26a, 26b protrude from the rear wall 21 to the front (+X) side. The pair of partition walls 26a, 26b are connected to the inner surface of the inner wall 22. The partition wall 26a is substantially U-shaped and opens to the right side when viewed in the front-rear direction X. The right end of the partition wall 26a is connected to a wall portion located on the right side of the inner wall 22. The partition wall 26b is substantially U-shaped and opens to the left side when viewed in the front-rear direction X. The left end of the partition wall 26b is connected to a wall portion located on the left side of the inner wall 22. A portion of the rear wall portion 21 surrounded by the partition wall portion 26a when viewed in the front-to-rear direction X, and a portion of the rear wall portion 21 surrounded by the partition wall portion 26b when viewed in the front-to-rear direction X, are formed with bolt holes through which bolts are passed to fix the rear wall portion 21 to a wall inside a room, etc.

[0018] Board fixing parts 24a and 24b are formed on the front (+X side) surface of the rear wall part 21. The board fixing parts 24a and 24b are cylindrical and protrude forward from the rear wall part 21. The board fixing parts 24a and 24b are located lower than the lid fixing part 21a. A female screw hole is formed at the tip of the board fixing parts 24a and 24b, into which a bolt for fixing the notification element board 41 described later is fastened.

[0019] 4 and 5, the housing main body 20 is formed with a board holding portion 29 that holds a sensor board 51, which will be described later. The board holding portion 29 is formed in a lower portion of the right side portion inside the inner circumferential wall portion 22. The board holding portion 29 has a plurality of ribs 29a. The plurality of ribs 29a includes a plurality of ribs 29a formed in a wall portion located on the lower side of the inner circumferential wall portion 22, a plurality of ribs 29a formed in a wall portion located on the right side of the inner circumferential wall portion 22, and a plurality of ribs 29a formed in a wall portion on the lower side of the partition wall portion 26a.

[0020] The board holding portion 29 has elastic claws 25a and 25b, fixed claws 28a and 28b, and support portions 27a, 27b, 27c, and 27d. The elastic claws 25a and 25b, the fixed claws 28a and 28b, and the support portions 27a, 27b, 27c, and 27d protrude from the rear wall portion 21 to the front side (+X side). The elastic claws 25a and 25b and the support portions 27a, 27b, 27c, and 27d are located on the left side of the board holding portion 29. The fixed claws 28a and 28b are located on the right side of the board holding portion 29. In this embodiment, the elastic claws 25a and the fixed claws 28a are claws that detachably fix a sensor board 51 described later.

[0021] The elastic claw portions 25a, 25b are elastically deformable in the left-right direction Y. As shown in Fig. 4, the elastic claw portion 25b is disposed to the left of the elastic claw portion 25a with a gap therebetween. The elastic claw portion 25b protrudes forward (to the +X side) further than the elastic claw portion 25a.

[0022] The pair of support portions 27a, 27b are arranged to sandwich the elastic claw portion 25a in the vertical direction Z. The support portion 27b is located above the support portion 27a. The pair of support portions 27c, 27d are arranged to sandwich the elastic claw portion 25b in the vertical direction Z. The support portion 27d is located above the support portion 27c. The support portion 27d is connected to the left side of the support portion 27b.

[0023] 5, the fixed claw portions 28a, 28b are disposed at positions where a sensor board 51 (described later) is sandwiched between the fixed claw portions 28a, 28b and the elastic claw portions 25a, 25b in the left-right direction Y. The fixed claw portion 28b is disposed to the right of the fixed claw portion 28a. The fixed claw portion 28b protrudes forward (to the +X side) further than the fixed claw portion 28a.

[0024] The housing main body 20 has an elastic claw portion 25c and fixed claw portions 28c, 28d. The elastic claw portion 25c and the fixed claw portions 28c, 28d are claw portions that hold a notification element substrate 41 described later. The elastic claw portion 25c and the fixed claw portions 28c, 28d protrude forward (+X side) from the rear wall portion 21. The elastic claw portion 25c is disposed on the right side of the upper portion of the rear wall portion 21. The elastic claw portion 25c is elastically deformable in the left-right direction Y. The fixed claw portions 28c, 28d are disposed on the left end portion of the rear wall portion 21. The fixed claw portion 28d is located below the fixed claw portion 28c. When viewed in the front-rear direction X, the fixed claw portion 28c and the fixed claw portion 28d are disposed with the partition wall portion 26b sandwiched between them in the up-down direction Z.

[0025] As shown in FIG. 1 and FIG. 3, the cover 30 is a substantially rectangular box-shaped opening on the rear side (-X side). The cover 30 covers the first board unit 40 and the second board unit 50 from the front side (+X side) described later. The cover 30 is a member having a light-shielding property that blocks light emitted from a light-emitting body 45 described later. The cover 30 has a cover wall 31 and an outer peripheral wall 32. The cover wall 31 is a substantially square plate. The plate surface of the cover wall 31 faces the front-rear direction X. The cover wall 31 is disposed in front of the rear wall 21 so as to face each other with a gap therebetween. The cover wall 31 has a light-shielding property that blocks light emitted from a light-emitting body 45 described later. The cover wall 31 covers the notification element board 41, the sensor board 51, and the refrigerant sensor 52 described later from the front side.

[0026] The outer peripheral wall 32 protrudes rearward (-X side) from the outer edge of the cover wall 31. The outer peripheral wall 32 is substantially square frame-shaped when viewed in the front-rear direction X. As shown in Figs. 6 to 8, the inner peripheral wall 22 is fitted inside the outer peripheral wall 32. At least a part of the rear end of the outer peripheral wall 32 contacts the front (+X side) surface of the flange 23. As shown in Fig. 1, a covering portion 32a is formed in the center of the upper wall of the outer peripheral wall 32 in the left-right direction Y, covering the lid fixing portion 21a formed on the housing main body 20 and the head of the bolt fastened to the lid fixing portion 21a. The covering portion 32a can be opened and closed. When the covering portion 32a is open, the head of the bolt fixing the lid portion 30 to the housing main body 20 is exposed to the outside of the housing 10.

[0027] A slit 33 is formed in the cover wall 31 of the lid 30, extending in one direction and connecting the outside of the housing 10 with the inside of the housing 10. In this embodiment, the slit 33 is formed at the lower end of the left side portion of the cover wall 31. In this embodiment, the slit 33 extends in the vertical direction Z. The slit 33 has a rectangular shape that is elongated in the vertical direction Z. A plurality of slits 33 are provided at intervals in the horizontal direction Y. In this embodiment, three slits 33 are provided. The lower end of the slit 33 opens into the underside of the lid 30.

[0028] FIG. 9 is a perspective view showing the lid 30. As shown in FIG. 9, a second protruding wall 35 is formed for each slit 33 on the surface of the cover wall 31 of the lid 30 on the inner side of the housing 10. The surface of the cover wall 31 on the inner side of the housing 10 is the rear (-X side) surface of the cover wall 31. A plurality of second protruding walls 35 are provided at intervals in the left-right direction Y. In this embodiment, three second protruding walls 35 are provided. Each second protruding wall 35 covers each slit 33 from the rear side. Each second protruding wall 35 protrudes rearward from an edge of the periphery of each slit 33 in the left-right direction Y. As shown in FIG. 8, in this embodiment, each second protruding wall 35 protrudes from an edge on the left side (-Y side) of the periphery of each slit 33 toward an opposing wall 61a described later.

[0029] As shown in Fig. 9, the second protruding wall portion 35 extends in the up-down direction Z, which is the extension direction of the slit 33. A lower end of the second protruding wall portion 35 is connected to a portion located on the lower side of the outer peripheral wall portion 32 of the cover portion 30. An upper end of the second protruding wall portion 35 is connected to an upper edge portion of the periphery of the slit 33. As shown in Fig. 8, the second protruding wall portion 35 has a first wall portion 35a, a second wall portion 35b, and a third wall portion 35c.

[0030] The first wall portion 35a protrudes from the edge of the periphery of the slit 33 in the left-right direction Y toward the opposing wall portion 61a described later. In this embodiment, the first wall portion 35a protrudes from the edge of the left side (-Y side) of the periphery of the slit 33 to the rear side (-X side). As shown in FIG. 6, the first wall portion 35a extends in the vertical direction Z. In this embodiment, the first wall portion 35a is a rectangular parallelepiped that is elongated in the vertical direction Z. The lower end of the first wall portion 35a is connected to a portion of the outer peripheral wall portion 32 of the lid portion 30 that is located on the lower side. The upper end of the first wall portion 35a is located above the upper end of the slit 33 in the vertical direction Z.

[0031] As shown in FIG. 8, the second wall portion 35b protrudes in the left-right direction Y from the tip end in the protruding direction of the first wall portion 35a. In this embodiment, the second wall portion 35b protrudes in the left-right direction Y in a direction approaching a refrigerant sensor 52 described later. Specifically, the second wall portion 35b protrudes to the right side (+Y side) from the end portion on the rear side (-X side) of the first wall portion 35a. The second wall portion 35b is located behind the slit 33 with a gap therebetween and faces the slit 33 in the front-rear direction X. The tip end of the protruding direction of the second wall portion 35b, i.e., the right end portion, is located slightly to the left (-Y side) of the right inner edge of the slit 33. The slit 33 is entirely covered from the rear side by the second wall portion 35b except for the right end portion. As shown in FIG. 9, the second wall portion 35b extends in the up-down direction Z. In this embodiment, the second wall portion 35b is a rectangular parallelepiped that is elongated in the up-down direction Z.

[0032] The third wall portion 35c protrudes forward (+X side) from the upper end of the second wall portion 35b. The tip end of the third wall portion 35c in the protruding direction, i.e., the front end, is connected to the upper edge of the periphery of the slit 33. The left end (-Y side) of the third wall portion 35c is connected to the upper end of the first wall portion 35a.

[0033] A first opening 31a is formed in the cover wall 31. The first opening 31a is a hole penetrating the cover wall 31 in the front-rear direction X. In this embodiment, the first opening 31a is a square hole having a pair of sides extending in the up-down direction Z and a pair of sides extending in the left-right direction Y. One first opening 31a is formed above the three slits 33 with a gap therebetween. A frame-shaped rib 38a is formed on the rear (-X side) surface of the cover wall 31 at the periphery of the first opening 31a. The frame-shaped rib 38a has a square frame shape surrounding the first opening 31a when viewed in the front-rear direction X.

[0034] A second opening 31b is formed in the cover wall 31. The second opening 31b is a hole penetrating the cover wall 31 in the front-rear direction X. In this embodiment, the second opening 31b is a rectangular hole that is long in the left-right direction Y. The second opening 31b is formed above the first opening 31a with a gap therebetween. In this embodiment, a plurality of second openings 31b are provided with a gap therebetween in the up-down direction Z. Specifically, three second openings 31b are provided.

[0035] Between the second openings 31b adjacent in the up-down direction Z on the rear side (-X side) surface of the cover wall portion 31, light shielding ribs 37 are formed so as to protrude rearward. The light shielding ribs 37 extend in the left-right direction Y. The light shielding rib 37 is plate-shaped with a plate surface facing the up-down direction Z. In this embodiment, two light shielding ribs 37 are provided with a gap therebetween in the up-down direction Z. The dimension of the light shielding rib 37 in the left-right direction Y is smaller than the dimension of the second openings 31b in the left-right direction Y. The light shielding rib 37 has a light shielding property that blocks light emitted from a light emitter 45 described later.

[0036] A retaining rib 36 is formed on the periphery surrounding the three second openings 31b on the rear (-X side) surface of the cover wall 31. The retaining rib 36 has a first rib portion 36a, a second rib portion 36b, a third rib portion 36c, a fourth rib portion 36d, and a fifth rib portion 36e. The first rib portion 36a is located between the first opening 31a and the second opening 31b located at the bottom in the up-down direction Z. The first rib portion 36a extends in the left-right direction Y. The first rib portion 36a protrudes on both sides in the left-right direction Y beyond the second opening 31b.

[0037] The second rib portion 36b extends upward from the left end (-Y side) of the first rib portion 36a. The second rib portion 36b is located away from the left side of the three second openings 31b. The upper end of the second rib portion 36b is located above the uppermost second opening 31b.

[0038] The third rib portion 36c extends to the right (+Y side) from the upper end of the second rib portion 36b. The right end of the third rib portion 36c is located to the left of the center of the second opening 31b in the left-right direction Y.

[0039] The fourth rib portion 36d protrudes downward from the right end (+Y side) of the third rib portion 36c. The lower end of the fourth rib portion 36d is disposed above and away from the uppermost second opening 31b. The fourth rib portion 36d is disposed to the left (-Y side) of the center in the left-right direction Y of the second opening 31b.

[0040] The fifth rib portion 36e protrudes upward from the first rib portion 36a. More specifically, the fifth rib portion 36e protrudes upward from a portion of the first rib portion 36a closer to the right side (closer to the +Y side). An upper end portion of the fifth rib portion 36e is disposed away from the lower side of the second opening 31b located at the lowermost side. The fifth rib portion 36e is located to the right (+Y side) of the center in the left-right direction Y of the second opening 31b.

[0041] A rib 38c is formed on the rear (-X side) surface of the cover wall portion 31, connecting a lower side portion of the frame-shaped rib 38a to an upper end portion of the second protruding wall portion 35. Two ribs 38c are provided at an interval in the left-right direction Y. A rib 38b is formed on the rear surface of the cover wall portion 31, connecting an upper side portion of the frame-shaped rib 38a to the first rib portion 36a of the holding rib 36. Two ribs 38b are provided at an interval in the left-right direction Y.

[0042] A pair of fitting holes 31c, 31d recessed toward the front side (+X side) are formed on the rear side (-X side) of the cover wall portion 31. The pair of fitting holes 31c, 31d are circular holes with bottoms on the front side. The pair of fitting holes 31c, 31d are formed at positions sandwiching the first opening 31a and the frame-shaped rib 38a in the left-right direction Y, respectively.

[0043] A pair of fixing parts 34a, 34b are formed on the rear (-X side) surface of the cover wall part 31, protruding rearward from the rear surface of the cover wall part 31. The pair of fixing parts 34a, 34b are cylindrical. The fixing part 34a is disposed on the right side (+Y side) of the three second protruding wall parts 35 with a gap therebetween. The fixing part 34b is disposed on the left side (-Y side) of the second rib part 36b of the retaining rib 36 with a gap therebetween. Each of the pair of fixing parts 34a, 34b is formed with a female screw hole 34c into which a bolt for fixing the inner member 60 described later is fastened.

[0044] A protruding plate portion 39 is formed on the rear (-X side) surface of the cover wall portion 31, protruding rearward from the rear surface of the cover wall portion 31. In this embodiment, the protruding plate portion 39 is a rectangular plate. The plate surface of the protruding plate portion 39 faces the left-right direction Y. The protruding plate portion 39 is disposed at an interval on the right side (+Y side) of the plurality of second protruding wall portions 35. The dimension of the protruding plate portion 39 in the up-down direction Z is smaller than the dimension of the second protruding wall portion 35 in the up-down direction Z. The upper end portion of the protruding plate portion 39 is located lower than the upper end portion of the second protruding wall portion 35. The lower end portion of the protruding plate portion 39 is located higher than the lower end portion of the second protruding wall portion 35.

[0045] As shown in FIG. 8, the protruding plate portion 39 is disposed at a distance from the right side of the inner member 60 described later. The protruding plate portion 39 protrudes rearward (−X side) from the inner member 60. The position of the protruding plate portion 39 in the left-right direction Y is between the position of the inner member 60 in the left-right direction Y and the position of the refrigerant sensor 52 described later in the left-right direction Y. The rear end of the protruding plate portion 39 is located rearward from the front end (+X side) of the refrigerant sensor 52. By providing the protruding plate portion 39, for example, even if static electricity flows on the rear surface of the cover wall portion 31 through the slit 33, the creeping distance until the static electricity reaches electronic components such as the refrigerant sensor 52 can be increased. Therefore, it is possible to make it difficult for static electricity flowing into the housing 10 through the slit 33 to reach electronic components such as the refrigerant sensor 52.

[0046] As described above, the lid part 30 is removably fixed to the housing body part 20. An operator who removes the lid part 30 from the housing body part 20 opens the covering part 32a of the lid part 30 to expose the head of the bolt that fixes the lid part 30 to the housing body part 20, and removes the bolt. This allows the operator to remove the lid part 30 from the housing body part 20.

[0047] As shown in Fig. 3, the alarm 100 includes a first board unit 40 and a second board unit 50. The first board unit 40 and the second board unit 50 are housed inside the housing 10. As shown in Figs. 4 and 5, the first board unit 40 is held across the left side and upper side of the housing main body 20. The second board unit 50 is held by a board holder 29.

[0048] As shown in FIG. 3, the first substrate unit 40 includes an alert element substrate 41, a speaker 42, a terminal block 43, a switch element 44, a light emitter 45, a first connector 46, and capacitors 47a, 47b, and 47c.

[0049] The notification element board 41 is a plate-like board whose surface faces the front-rear direction X. The surface of the notification element board 41 is perpendicular to the front-rear direction X. The speaker 42, the terminal block 43, the switch element 44, the light emitter 45, the first connector 46, and the capacitors 47a, 47b, and 47c are attached to the front (+X) surface of the notification element board 41. The speaker 42, the terminal block 43, the switch element 44, the light emitter 45, the first connector 46, and the capacitors 47a, 47b, and 47c are electrically connected to the notification element board 41. The speaker 42, the terminal block 43, the switch element 44, the light emitter 45, the first connector 46, and the capacitors 47a, 47b, and 47c are electrically connected to the notification element board 41 by, for example, soldering. The notification element board 41 is a printed circuit board having a conductor wiring pattern.

[0050] As shown in FIG. 5, the notification element substrate 41 has a first portion 41a, a second portion 41b, a third portion 41c, a fourth portion 41d, and a fifth portion 41e. The first portion 41a extends in the up-down direction Z. The second portion 41b protrudes leftward from the upper end of the first portion 41a. The third portion 41c protrudes rightward from the first portion 41a. The upper end of the third portion 41c is located lower than the upper end of the first portion 41a. The fourth portion 41d protrudes leftward from the lower portion of the first portion 41a. The fourth portion 41d is disposed below the second portion 41b with a gap therebetween. The fifth portion 41e protrudes rightward from the lower end of the first portion 41a. The right end of the fifth portion 41e is located leftward of the right end of the third portion 41c. The fifth portion 41e is disposed below the left end portion of the third portion 41c with a gap therebetween.

[0051] As shown in Fig. 4, the notification element substrate 41 is formed with bolt holes 48a, 48b penetrating the notification element substrate 41 in the front-rear direction X. The bolt hole 48a is formed at the left end of the lower end of the third portion 41c. Although not shown in the figure, a bolt is inserted into the bolt hole 48a to be fastened to the female threaded hole of the substrate fixing portion 24a. The bolt hole 48b is formed at the connection portion between the first portion 41a and the fifth portion 41e. Although not shown in the figure, a bolt is inserted into the bolt hole 48b to be fastened to the female threaded hole of the substrate fixing portion 24b.

[0052] As shown in FIG. 5, the notification element board 41 is held by the housing main body 20. In the present embodiment, the elastic claw portion 25c and the fixed claw portions 28c and 28d are hooked from the front side (+X side) to the edge portion of the notification element board 41, and the bolts passed through the bolt holes 48a and 48b are fastened to the female screw holes of the board fixing portions 24a and 24b, so that the notification element board 41 is fixed to the housing main body 20. The elastic claw portion 25c is hooked from the front side to the right edge portion of the third portion 41c. The fixed claw portion 28c is hooked from the front side to the left edge portion of the second portion 41b. The fixed claw portion 28d is hooked from the front side to the left edge portion of the fourth portion 41d.

[0053] The speaker 42 is cylindrical with an axis extending in the front-rear direction X as its center. The speaker 42 is disposed across the first portion 41a and the fourth portion 41d. The speaker 42 is an alarm element capable of alarming that the refrigerant sensor 52 described later has detected the refrigerant. When the refrigerant sensor 52 detects the refrigerant, the speaker 42 alarms the user, etc., by sound. The speaker 42 is, for example, a buzzer that generates a simple continuous sound. When the refrigerant sensor 52 detects the refrigerant, for example, a simple continuous sound is output from the speaker 42 as a warning sound to notify the user, etc., that the refrigerant is leaking from the indoor unit of the air conditioner. Note that the speaker 42 may be a speaker that outputs a sound to notify the user, etc., that the refrigerant is leaking from the indoor unit of the air conditioner when the refrigerant sensor 52 detects the refrigerant.

[0054] The terminal block 43 is disposed in the third portion 41c. Although not shown in the drawing, a plurality of wires are connected to the terminal block 43. The plurality of wires are electrically connected to the alarm element board 41 via the terminal block 43. The plurality of wires are drawn out to the outside of the housing 10, for example, through a hole 22a formed in the inner circumferential wall portion 22. The plurality of wires includes a power supply line that supplies power to the alarm 100.

[0055] The switch element 44 is disposed in the center of the first portion 41a in the up-down direction Z. As shown in FIG. 3, the switch element 44 has a case portion 44a and a switch body portion 44b. The case portion 44a is connected to the alarm element board 41. The switch body portion 44b is cylindrical and protrudes from the case portion 44a to the front side (+X side). The switch body portion 44b can be pushed into the case portion 44a by being pushed from the front side to the rear side (-X side). When the switch body portion 44b is pushed rearward relative to the case portion 44a, the switch element 44 is activated and the alarm 100 stops reporting.

[0056] As shown in FIG. 5, the light emitter 45 is disposed in the upper part of the first portion 41a. The light emitter 45 is, for example, a light emitting diode (LED). In this embodiment, the light emitters 45 are arranged in a line at intervals in the vertical direction Z. In this embodiment, three light emitters 45 are provided, namely, light emitter 45a, light emitter 45b, and light emitter 45c. The light emitter 45a, light emitter 45b, and light emitter 45c are arranged in this order from the top to the bottom at intervals. Each of the light emitters 45a, 45b, and 45c is accommodated inside the housing 10.

[0057] The light emitter 45a is a light emitter 45 that indicates the input state of the power supply of the alarm 100. The light emitter 45a emits light when power is supplied to the alarm 100. The light emitter 45b is an alarm element that can notify that the refrigerant sensor 52 described later has detected the refrigerant. The light emitter 45b emits light when the refrigerant sensor 52 detects the refrigerant. The light emitter 45c is a light emitter 45 that indicates that some malfunction has occurred in the alarm 100. The light emitter 45c emits light when some malfunction has occurred in the alarm 100. The light emitted from each of the light emitters 45a, 45b, and 45c is emitted to the outside of the housing 10 through each of the second openings 31b formed in the cover portion 30. This allows the user, etc. to visually recognize the light emitted from each of the light emitters 45a, 45b, and 45c from the outside of the alarm 100.

[0058] The first connector 46 is disposed at the right end of the lower end of the third portion 41c. The first connector 46 is located below the terminal block 43. A cable 90 that connects the notification element board 41 and a sensor board 51 (described later) is connected to the first connector 46. The cable 90 has a plurality of wires 90a extending from the first connector 46 and a cable connector 90b to which the tips of the plurality of wires 90a are connected. The cable connector 90b is connected to a second connector 53 (described later), so that the notification element board 41 and the sensor board 51 are electrically connected via the cable 90.

[0059] The second board unit 50 is held by the board holding portion 29. The second board unit 50 is located below the third portion 41c of the notification element board 41 and to the right of the lower portion of the first portion 41a and the fifth portion 41e. The second board unit 50 has a sensor board 51, a refrigerant sensor 52, a second connector 53, and an IC chip 54.

[0060] In this embodiment, the sensor substrate 51 is separate from the notification element substrate 41. The sensor substrate 51 is disposed apart from the notification element substrate 41. The sensor substrate 51 is located below the third portion 41c of the notification element substrate 41, and is located at the lower side of the first portion 41a and to the right of the fifth portion 41e. The sensor substrate 51 is a rectangular plate whose plate surface faces the front-rear direction X. The plate surface of the sensor substrate 51 is perpendicular to the front-rear direction X. In this embodiment, the sensor substrate 51 is a square plate having a pair of sides extending in the left-right direction Y and a pair of sides extending in the up-down direction Z. The sensor substrate 51 and the notification element substrate 41 may be integrated together.

[0061] The front (+X side) surface of the sensor board 51 is a mounting surface 51a. The refrigerant sensor 52, the second connector 53, and the IC chip 54 are attached to the mounting surface 51a. The refrigerant sensor 52, the second connector 53, and the IC chip 54 are electrically connected to the sensor board 51. The refrigerant sensor 52, the second connector 53, and the IC chip 54 are electrically connected to the sensor board 51 by, for example, soldering. The sensor board 51 is a printed circuit board having a conductor wiring pattern.

[0062] The sensor board 51 is held by the housing main body 20. In this embodiment, the sensor board 51 is held by the board holding portion 29. In this embodiment, the sensor board 51 is surrounded by the supports 27a, 27b and the multiple ribs 29a to support the outer periphery, and is held by the board holding portion 29 by the elastic claw portion 25a and the fixed claw portion 28a hooking onto the outer periphery of the sensor board 51 from the front side (+X side). The elastic claw portion 25a hooks onto the left edge of the sensor board 51 from the front side. The fixed claw portion 28a hooks onto the right edge of the sensor board 51 from the front side.

[0063] The support portion 27a supports the left and lower corner of the sensor board 51 from the left side. The support portion 27b supports the left and upper corner of the sensor board 51 from the left side and the upper side. The multiple ribs 29a formed on the lower wall portion of the inner circumferential wall portion 22 support the lower edge of the sensor board 51 from the lower side. The multiple ribs 29a formed on the right wall portion of the inner circumferential wall portion 22 support the right edge of the sensor board 51 from the right side. The multiple ribs 29a formed on the lower wall portion of the partition wall portion 26a support the upper edge of the sensor board 51 from the upper side.

[0064] The refrigerant sensor 52 is a sensor capable of detecting the refrigerant. In this embodiment, the refrigerant sensor 52 is a semiconductor-type refrigerant sensor. The refrigerant sensor 52 is capable of detecting the gaseous refrigerant sensor 52. As shown in FIG. 3, the refrigerant sensor 52 is cylindrical and extends from the sensor board 51 to the front side (+X side). The refrigerant sensor 52 is attached to the lower part of the left side part of the sensor board 51. In this embodiment, when the gaseous refrigerant that has flowed into the housing 10 from the slit 33 comes into contact with the refrigerant sensor 52, the refrigerant sensor 52 detects the refrigerant. Therefore, for example, by arranging the alarm device 100 vertically below the indoor unit of the air conditioner, the refrigerant sensor 52 can detect the refrigerant that has leaked from the indoor unit and flowed vertically downward.

[0065] 5, the second connector 53 is attached to the right side portion of the sensor board 51. A cable connector 90b of a cable 90 extending from the first connector 46 is detachably connected to the second connector 53. The first connector 46 and the second connector 53 are electrically connected by the cable 90, whereby the sensor board 51 is electrically connected to the notification element board 41.

[0066] The IC chip 54 is attached to an upper portion of the left side portion of the sensor board 51. The IC chip 54 is a square plate with a plate surface facing the front-rear direction X. The IC chip 54 is located above the refrigerant sensor 52 and to the left of the second connector 53. When the refrigerant sensor 52 detects a refrigerant, the IC chip 54 sends a signal indicating that the refrigerant sensor 52 has detected a refrigerant to the notification element board 41 via the cable 90. When the signal is sent from the IC chip 54 to the notification element board 41, the light emitter 45b lights up and a sound is played from the speaker 42 to notify the user of a refrigerant leak.

[0067] 3, the alarm 100 includes an inner member 60, a button member 70, and a transparent member 80. The inner member 60, the button member 70, and the transparent member 80 are housed inside the housing 10. The inner member 60 is located between the alarm element substrate 41 and the cover wall portion 31 in the front-rear direction X. The button member 70 and the transparent member 80 are located between the inner member 60 and the cover wall portion 31 in the front-rear direction X.

[0068] In this embodiment, the inner member 60 is a member having a light-shielding property that blocks light emitted from the light emitter 45. The inner member 60 is made of, for example, resin. FIG. 10 is a perspective view showing the inner member 60. FIG. 11 is a perspective view showing the inner member 60, and is a view showing the inner member 60 from an angle different from that of FIG. 10. FIG. 12 is a cross-sectional view showing the inner member 60. As shown in FIG. 10, the inner member 60 extends in the up-down direction Z. The inner member 60 has a main body portion 61, a first protruding wall portion 62a, a frame-shaped wall portion 62b, a pair of first light-shielding walls 62e, a second light-shielding wall portion 62f, a light-shielding tube portion 63, and a pair of fixed portions 64a, 64b.

[0069] 10 to 12, the main body 61 has a rectangular plate shape extending in the up-down direction Z. The plate surface of the main body 61 faces the front-rear direction X. The main body 61 has an opposing wall 61a, a stopper wall 61b, and an upper wall 61c. The opposing wall 61a, the stopper wall 61b, and the upper wall 61c are connected in this order from the bottom to the top.

[0070] The facing wall 61a is a lower portion of the main body 61. The lower end of the facing wall 61a is the lower end of the main body 61. The facing wall 61a has a rectangular shape that is long in the up-down direction Z when viewed in the front-rear direction X. As shown in FIG. 8, the facing wall 61a is disposed on the rear side (-X side) of the slits 33 and disposed opposite the slits 33 in the front-rear direction X. The facing wall 61a is disposed with a gap behind the second protruding wall 35 formed on the periphery of each slit 33. The right end of the facing wall 61a is located to the right of the multiple slits 33. The left end of the facing wall 61a is located to the left of the multiple slits 33.

[0071] 6, the upper end of the opposing wall 61a is located above the upper end of the slit 33. The lower end of the opposing wall 61a is located above the lower end of the slit 33. The lower end of the opposing wall 61a is located above a portion of the outer peripheral wall 32 of the lid 30 that is located on the lower side. In other words, the lower end of the opposing wall 61a in the vertical direction is located above a surface of the inner surface of the housing 10 that is located on the vertical lower side.

[0072] As shown in FIG. 10, the stopper wall 61b is connected to the upper side of the opposing wall 61a. The stopper wall 61b is a central portion of the main body 61 in the up-down direction Z. The stopper wall 61b is substantially square-shaped when viewed in the front-rear direction X. The stopper wall 61b is formed with a through hole 61d penetrating the stopper wall 61b in the front-rear direction X. The through hole 61d is a circular hole formed in the center of the stopper wall 61b in the left-right direction Y and in the center of the stopper wall 61b in the up-down direction Z. As shown in FIG. 6, the stopper wall 61b is located between a button main body 72 (to be described later) and the switch element 44 of the button member 70 in the front-rear direction X.

[0073] 10 and 11, the upper wall portion 61c is connected to the upper side of the stopper wall portion 61b. The stopper wall portion 61b is an upper portion of the main body portion 61. The upper end portion of the upper wall portion 61c is an upper end portion of the main body portion 61. The upper wall portion 61c has a rectangular shape that is long in the up-down direction Z when viewed in the front-rear direction X. As shown in FIG. 6, the upper end portion of the upper wall portion 61c is located above the transparent member 80.

[0074] As shown in FIG. 10, the first protruding wall portion 62a protrudes from the opposing wall portion 61a to the front side (+X side). In this embodiment, a pair of the first protruding wall portions 62a are provided with an interval in the left-right direction Y. The pair of first protruding wall portions 62a protrude to the front side from each of both edges of the opposing wall portion 61a in the left-right direction Y. The pair of first protruding wall portions 62a extend in the up-down direction Z from the upper end to the lower end of the opposing wall portion 61a. In this embodiment, the pair of first protruding wall portions 62a are in the shape of a long and narrow rectangular plate that is long in the up-down direction Z. The plate surfaces of the pair of first protruding wall portions 62a face the left-right direction Y.

[0075] 8, the pair of first protruding wall portions 62a protrude from the opposing wall portion 61a toward the cover wall portion 31. The pair of first protruding wall portions 62a are disposed to sandwich the multiple second protruding wall portions 35 in the left-right direction Y. More specifically, the front (+X side) ends of the pair of first protruding wall portions 62a are disposed to sandwich the rear (-X side) ends of the first wall portions 35a of the multiple second protruding wall portions 35 and the second wall portions 35b in the left-right direction Y.

[0076] The pair of first protruding walls 62a are disposed apart from the plurality of second protruding walls 35 in the left-right direction Y. The front (+X) ends of the pair of first protruding walls 62a are located forward of the rear (-X) ends of the plurality of second protruding walls 35. When viewed in the left-right direction Y, the front ends of the pair of first protruding walls 62a overlap the rear ends of the first walls 35a and the second walls 35b of the plurality of second protruding walls 35. That is, the first protruding wall 62a and the second protruding wall 35 have portions that overlap each other when viewed in the left-right direction Y. The front ends of the first protruding wall 62a are disposed at an interval on the rear side of the cover wall 31. The front ends of the first protruding wall 62a are disposed at the same position in the front-back direction X as the front surface of the second wall 35b of the second protruding wall 35.

[0077] As shown in Fig. 10, the frame-shaped wall portion 62b protrudes forward (+X side) from the outer peripheral edge portion of the stopper wall portion 61b. The frame-shaped wall portion 62b has a substantially square frame shape. The front end portion of the frame-shaped wall portion 62b is located rearward (-X side) from the front end portion of the first protruding wall portion 62a. The upper ends of the pair of first protruding wall portions 62a are connected to both ends of the lower end portion of the frame-shaped wall portion 62b in the left-right direction Y, respectively.

[0078] The pair of first light-shielding walls 62e have a light-shielding property that blocks light emitted from the light emitter 45. The pair of first light-shielding walls 62e protrude forward (+X side) from both edges of the upper wall 61c in the left-right direction Y. The pair of first light-shielding walls 62e extend in the up-down direction Z. The pair of first light-shielding walls 62e are substantially rectangular plates that are long in the up-down direction Z. The plate surfaces of the pair of first light-shielding walls 62e face the left-right direction Y. The front ends of the pair of first light-shielding walls 62e are located forward of the front end of the first protruding wall 62a. The lower ends of the pair of first light-shielding walls 62e are connected to both ends in the left-right direction Y of the upper end of the frame-shaped wall 62b.

[0079] 7, the pair of first light-shielding walls 62e sandwich the transparent member 80 in the left-right direction Y. More specifically, front portions of the pair of first light-shielding walls 62e sandwich a base 81 (described later) of the transparent member 80 in the left-right direction Y. The pair of first light-shielding walls 62e are disposed at a distance from the base 81 of the transparent member 80 in the left-right direction Y. Front (+X side) ends of the pair of first light-shielding walls 62e face the rear surface of the cover wall 31 in the front-rear direction X with a small gap therebetween.

[0080] The second light-shielding wall portion 62f has a light-shielding property that blocks light emitted from the light emitter 45. As shown in FIG. 10 and FIG. 12, the second light-shielding wall portion 62f protrudes from the upper end of the upper wall portion 61c toward the front side (+X side). The front end of the second light-shielding wall portion 62f is disposed at the same position in the front-rear direction X as the front end of the pair of first light-shielding wall portions 62e. As shown in FIG. 10, the second light-shielding wall portion 62f extends in the left-right direction Y. The second light-shielding wall portion 62f connects the ends of one side of the pair of first light-shielding wall portions 62e, that is, the upper ends of the pair of first light-shielding wall portions 62e. The second light-shielding wall portion 62f is a rectangular plate shape that is long in the left-right direction Y. The plate surface of the second light-shielding wall portion 62f faces the up-down direction Z.

[0081] 6, the second light-shielding wall 62f covers the transparent member 80 from one side in the up-down direction Z, i.e., from the upper side. More specifically, a front portion of the second light-shielding wall 62f covers a base 81 (described later) of the transparent member 80 from above. The front end of the second light-shielding wall 62f faces the rear (-X side) surface of the cover wall 31 in the front-rear direction X with a small gap therebetween. The second light-shielding wall 62f covers, from above, the end of the transparent member 80 that is closer to the inner surface of the housing 10 in the up-down direction Z, i.e., the upper end.

[0082] As shown in Fig. 10 to Fig. 12, the light-shielding tube portion 63 has a cylindrical shape extending in the front-rear direction X. In this embodiment, the light-shielding tube portion 63 has a square cylindrical shape. When viewed in the front-rear direction X, the outer shape of the light-shielding tube portion 63 is a rectangle with rounded corners that is elongated in the left-right direction Y. The light-shielding tube portion 63 is open on both sides in the front-rear direction X. A plurality of light-shielding tube portions 63 are provided at intervals in the up-down direction Z.

[0083] As shown in FIG. 12, the light-shielding tube portion 63 protrudes from the upper wall portion 61c on both sides in the front-rear direction X. The light-shielding tube portion 63 has a rear tube portion 63a protruding rearward (-X side) from the upper wall portion 61c, and a front tube portion 63b protruding forward (+X side) from the upper wall portion 61c. The dimension of the rear tube portion 63a in the front-rear direction X is larger than the dimension of the front tube portion 63b in the front-rear direction X. The dimension of the front tube portion 63b in the up-down direction Z is slightly smaller than the dimension of the rear tube portion 63a in the up-down direction Z. The rear end of the rear tube portion 63a is the rear end of the light-shielding tube portion 63. The front end of the front tube portion 63b is the front end of the light-shielding tube portion 63. The front end of the front tube portion 63b is located rearward of the front end of the first light-shielding wall portion 62e and the front end of the second light-shielding wall portion 62f. The front tube portion 63b is located between the pair of first light-shielding walls 62e in the left-right direction Y.

[0084] A connecting rib 65a is formed between the rear tube portions 63a adjacent to each other in the up-down direction Z, connecting the rear tube portions 63a adjacent to each other in the up-down direction Z. The connecting rib 65a extends in the front-rear direction X. A rear end (-X side) of the connecting rib 65a is located forward (+X side) of the rear end of the rear tube portion 63a. A front end of the connecting rib 65a is connected to the upper wall portion 61c.

[0085] As shown in FIG. 6, each of the light-shielding tube portions 63 extends from each of the light-emitting bodies 45 to the transparent member 80. In this embodiment, the rear end (-X side) of the light-shielding tube portion 63 is disposed at approximately the same position in the front-rear direction X as the front end face (+X side) of the light-emitting body 45. The front end face of the light-emitting body 45 is exposed to the rear opening of the light-shielding tube portion 63. The rear end of the light-shielding tube portion 63 is disposed away from the notification element substrate 41 to the front side. The front end of the light-shielding tube portion 63 is in contact with the rear surface of the transparent member 80. Each of the light-shielding tube portions 63 guides the light emitted from each of the light-emitting bodies 45 to the transparent member 80.

[0086] As shown in FIG. 10, the pair of fixed parts 64a, 64b protrude in the left-right direction Y from the main body part 61. The fixed part 64a protrudes to the right from the lower part of the main body part 61. The fixed part 64b protrudes to the left from the upper part of the main body part 61. The fixed part 64a is fixed to the fixing part 34a formed on the cover wall part 31 with a bolt. The fixed part 64b is fixed to the fixing part 34b formed on the cover wall part 31 with a bolt. In this way, the inner member 60 is fixed to the cover wall part 31.

[0087] As shown in Fig. 11, a rib 61e extending in the up-down direction Z is formed on the rear (-X side) surface of the inner member 60. The upper end of the rib 61e is connected to the lower surface of the rear tube portion 63a of the light-shielding tube portion 63 located at the lowest position among the three light-shielding tube portions 63. The lower end of the rib 61e is disposed above and away from the lower end of the main body portion 61. A pair of the ribs 61e are provided with a gap therebetween in the left-right direction Y. The pair of ribs 61e are disposed to sandwich the through hole 61d in the left-right direction Y.

[0088] 6, the button member 70 is located on the front side (+X side) of the switch element 44. The button member 70 is a member with which a user presses the switch element 44. The user can press the switch element 44 via the button member 70 by pressing the button member 70 toward the rear side (-X side) from outside the housing 10. The button member 70 is made of, for example, resin.

[0089] Fig. 13 is a perspective view of the button member 70. Fig. 14 is a perspective view of the button member 70, and is a view of the button member 70 viewed from an angle different from that of Fig. 13. Fig. 15 is a cross-sectional view showing the button member 70 in a pressed state. As shown in Figs. 13 and 14, the button member 70 has a support frame portion 71, a button main body portion 72, a protrusion portion 74, and a pair of connecting portions 75, 76.

[0090] The support frame portion 71 has a rectangular frame shape with rounded corners that is long in the left-right direction Y. As shown in FIG. 3, the support frame portion 71 is located on the front side (+X side) of the stopper wall portion 61b of the inner member 60. The support frame portion 71 protrudes on both sides in the left-right direction Y beyond the stopper wall portion 61b. The support frame portion 71 contacts, from the front side, sides located on both sides in the left-right direction Y of the frame-shaped wall portion 62b formed on the outer circumferential edge portion of the stopper wall portion 61b. This positions the button member 70 in the front-rear direction X with respect to the inner member 60.

[0091] 13, a pair of overhanging portions 77a, 77b that protrude inwardly of the support frame portion 71 and a pair of fitting protrusions 78a, 78b that protrude forward (+X side) from the pair of overhanging portions 77a, 77b are formed on the inner edge of the support frame portion 71. The overhanging portion 77a is formed on the right and upper corner of the inner edge of the support frame portion 71. The overhanging portion 77b is formed on the left and lower corner of the inner edge of the support frame portion 71.

[0092] The fitting protrusion 78a is cylindrical and protrudes forward (+X side) from a lower portion of the overhang 77a. The fitting protrusion 78b is cylindrical and protrudes forward from an upper portion of the overhang 77b. The fitting protrusion 78a is fitted from the rear into a fitting hole 31c formed in the rear (-X side) surface of the cover wall 31. The fitting protrusion 78b is fitted from the rear into a fitting hole 31d formed in the rear surface of the cover wall 31. The pair of fitting protrusions 78a, 78b are fitted into the pair of fitting holes 31c, 31d, respectively, so that the button member 70 is positioned in the up-down direction Z and the left-right direction Y with respect to the cover wall 31.

[0093] The button body 72 is located in the center of the support frame 71 in the left-right direction Y. The button body 72 is connected to the support frame 71 via a pair of connecting parts 75, 76. As shown in FIG. 13 and FIG. 14, the button body 72 is a rectangular box shape that opens to the rear side (-X side). The button body 72 is substantially square when viewed in the front-rear direction X. As shown in FIG. 6, the button body 72 is disposed between the inner member 60 and the cover wall 31 in the front-rear direction X. The button body 72 is movable toward the switch element 44. Specifically, the button body 72 moves rearward when pushed rearward by the user. In the following description, the relative positional relationship of the button body 72 is the relative positional relationship in a state where the button body 72 is not pushed by the user, unless otherwise specified.

[0094] The button body 72 is disposed facing the front side (+X side) of the stopper wall 61b. The button body 72 has a contact portion 72a and an exposed portion 72b. The contact portion 72a is a rear portion of the button body 72. The contact portion 72a is located inside the support frame 71. The contact portion 72a contacts a frame-shaped rib 38a formed on the rear (-X side) surface of the cover wall 31 from the rear side. This prevents the button body 72 from slipping out of the first opening 31a to the front side.

[0095] The exposed portion 72b is a front portion of the button body 72. The exposed portion 72b is connected to the front side of the contact portion 72a. The exposed portion 72b protrudes forward beyond the support frame 71. As shown in FIG. 13, the dimension of the exposed portion 72b in the left-right direction Y is smaller than the dimension of the contact portion 72a in the left-right direction Y. The dimension of the exposed portion 72b in the up-down direction Z is smaller than the dimension of the contact portion 72a in the up-down direction Z. When viewed in the front-rear direction X, the outer edge of the contact portion 72a is positioned outwardly and apart from the outer edge of the exposed portion 72b.

[0096] As shown in FIG. 6, the exposed portion 72b is fitted into a first opening 31a formed in the cover wall portion 31 from the rear side (-X side). The exposed portion 72b closes the first opening 31a. The front (+X side) surface of the exposed portion 72b is exposed to the front side of the housing 10 through the first opening 31a. As a result, a part of the button main body 72 is exposed to the outside of the housing 10 through the first opening 31a. In this embodiment, the front surface of the button main body 72 is disposed at the same position in the front-rear direction X as the front surface of the cover wall portion 31.

[0097] The protrusion 74 extends from the button body 72 toward the switch element 44. In this embodiment, the protrusion 74 extends rearward from the rear (-X side) surface of the exposed portion 72b of the button body 72. The protrusion 74 passes through a through hole 61d formed in the stopper wall 61b and faces the switch element 44. More specifically, the protrusion 74 passes through the through hole 61d from the front side (+X side) and faces the switch body 44b of the switch element 44. The rear end of the protrusion 74 faces the switch body 44b in the front-rear direction X via a gap. The protrusion 74 protrudes rearward beyond the stopper wall 61b. As shown in FIG. 6 and FIG. 14, the protrusion 74 is cylindrical and opens rearward. The protrusion 74 is molded integrally with the button body 72 and moves in the front-rear direction X as the button body 72 moves in the front-rear direction X. That is, like the button body 72, the protrusion 74 is also movable toward the switch element 44.

[0098] As shown in FIG. 13, each of the pair of connecting parts 75, 76 connects the support frame part 71 and the button body part 72. The pair of connecting parts 75, 76 can be elastically deformed in the front-rear direction X. When the button body part 72 is pressed and moves in the front-rear direction X, the pair of connecting parts 75, 76 elastically deform in the front-rear direction X. When the button body part 72 is pressed and the force is no longer applied to the button body part 72, the pair of elastically deformed connecting parts 75, 76 are restored to their original deformation. As a result, the button body part 72 moves forward and returns to its original position. The connecting part 75 connects a lower part of the right side of the inner edge of the support frame part 71 to an upper end of the right edge of the contact part 72a of the button body part 72. The connecting part 76 connects an upper part of the left side of the inner edge of the support frame part 71 to a lower end of the left edge of the contact part 72a of the button body part 72.

[0099] The connecting portion 75 has a first extending portion 75a extending leftward from a lower portion of the right side of the inner edge of the support frame portion 71, a second extending portion 75b extending upward from the left end of the first extending portion 75a, and a third extending portion 75c extending leftward from the upper end of the second extending portion 75b and connecting to the upper end of the contact portion 72a. The first extending portion 75a is located below the overhanging portion 77a. The second extending portion 75b is located to the left of the overhanging portion 77a.

[0100] The connecting portion 76 has a first extending portion 76a extending rightward from an upper portion of the left side of the inner edge of the support frame portion 71, a second extending portion 76b extending downward from a right end portion of the first extending portion 76a, and a third extending portion 76c extending rightward from a lower end portion of the second extending portion 76b and connecting to a lower end portion of the contact portion 72a. The first extending portion 76a is located above the overhanging portion 77b. The third extending portion 76c is located to the right of the overhanging portion 77b.

[0101] As shown in FIG. 15, when the exposed portion 72b of the button body 72 is pushed backward (-X side) by the user, both the button body 72 and the protrusion 74 move backward. As a result, the protrusion 74 comes into contact with the switch body 44b, and the protrusion 74 pushes the switch body 44b backward. In this way, the protrusion 74 can be moved toward the switch element 44 to push the switch element 44. The user can push the button body 72 backward until the contact portion 72a of the button body 72 comes into contact with the stopper wall 61b from the front side (+X side). In a state in which the button body 72 is moved backward until the contact portion 72a comes into contact with the stopper wall 61b from the front side, the switch element 44 is in an activated state with the switch body 44b pushed backward by the protrusion 74. In this way, the stopper wall 61b comes into contact with the button body 72 in a state in which the protrusion 74 pushes the switch element 44.

[0102] As shown in FIG. 6, the transparent member 80 is accommodated in an upper portion of the interior of the housing 10. The transparent member 80 is a member that is capable of transmitting light emitted from the light emitter 45. In the present embodiment, the transparent member 80 is a semi-transparent member. The transparent member 80 may be a transparent member. The transparent member 80 is made of, for example, resin. The transparent member 80 is located between the multiple light-shielding tube portions 63 and the cover wall portion 31 in the front-rear direction X. The transparent member 80 covers the second opening 31b formed in the cover wall portion 31 from the interior of the housing 10.

[0103] Fig. 16 is a perspective view showing the transparent member 80. Fig. 17 is a perspective view showing the transparent member 80, and is a view showing the transparent member 80 from an angle different from that shown in Fig. 16. As shown in Figs. 16 and 17, the transparent member 80 has a generally rectangular plate shape with rounded corners that is long in the up-down direction Z. The plate surface of the transparent member 80 faces the front-rear direction X. As shown in Fig. 16, the transparent member 80 has a base 81 and a protrusion 82.

[0104] The base 81 has a generally rectangular shape with rounded corners that is long in the up-down direction Z. The plate surface of the base 81 faces the front-rear direction X. As shown in FIG. 9, the base 81 is held within the holding rib 36. The lower edge of the base 81 is supported from below by the first rib portion 36a. The left edge (-Y side) of the base 81 is supported from the left side by the second rib portion 36b. As a result, the transparent member 80 is positioned relative to the cover wall portion 31 in the up-down direction Z and the left-right direction Y.

[0105] 6, the base 81 is disposed between the cover wall 31 and the light-shielding tube 63 in the front-rear direction X. The base 81 is in contact with the cover wall 31 and the light-shielding tube 63. The base 81 is pressed against the cover wall 31 from the rear side (-X side) by the light-shielding tube 63. This prevents the transparent member 80 from shifting in the front-rear direction X.

[0106] As shown in FIG. 16 and FIG. 17, the base 81 is formed with a hole 81a penetrating the base 81 in the front-rear direction X. The hole 81a is an elongated hole extending in the left-right direction Y. Two holes 81a are provided at an interval in the up-down direction Z. The two holes 81a are formed at positions that divide the base 81 into approximately three equal parts in the up-down direction Z. As shown in FIG. 6, two light-shielding ribs 37 formed on the rear (-X side) surface of the cover wall 31 pass through each of the two holes 81a in the front-rear direction X. The rear end of the light-shielding rib 37 protrudes rearward beyond the rear surface of the base 81. The rear end of the light-shielding rib 37 is located between the front ends of the front tube parts 63b of the light-shielding tube parts 63 adjacent to each other in the up-down direction Z.

[0107] As shown in FIG. 16, a pair of engagement recesses 81b, 81c are formed in the base 81. The engagement recess 81b is recessed downward from a left portion of an upper edge of the base 81. The engagement recess 81b penetrates the base 81 in the front-rear direction X. The engagement recess 81c is recessed upward from a right portion of a lower edge of the base 81. The engagement recess 81c penetrates the base 81 in the front-rear direction X. As shown in FIG. 9, the fourth rib portion 36d of the holding rib 36 is inserted and engaged in the engagement recess 81b. The fifth rib portion 36e of the holding rib 36 is inserted and engaged in the engagement recess 81c. The fourth rib portion 36d and the fifth rib portion 36e are caught in the inner surfaces of the engagement recesses 81b, 81c in the left-right direction Y, thereby suppressing the transparent member 80 from being displaced in the left-right direction Y.

[0108] As shown in FIG. 16, the protrusion 82 protrudes from the base 81 to the front side (+X side). The protrusion 82 has an elongated rectangular parallelepiped shape extending in the left-right direction Y. A plurality of the protrusions 82 are provided at intervals in the up-down direction Z. In the present embodiment, three protrusions 82 are provided. One protrusion 82 is located above the two holes 81a. The other protrusion 82 is located between the two holes 81a in the up-down direction Z. The remaining protrusion 82 is located below the two holes 81a. In other words, the two holes 81a are formed in portions of the base 81 that are located between the protrusions 82 adjacent to each other in the up-down direction Z.

[0109] As shown in FIG. 6, the three protrusions 82 are inserted into the three second openings 31b formed in the cover wall 31. In this embodiment, each protrusion 82 is fitted into each second opening 31b. Each protrusion 82 blocks each second opening 31b. The front (+X side) surface of each protrusion 82 is exposed to the front side of the cover wall 31 through each second opening 31b. As a result, a part of each protrusion 82 is exposed to the outside of the housing 10 through each second opening 31b. The front surface of each protrusion 82 is disposed at the same position in the front-rear direction X as the front surface of the cover wall 31.

[0110] The light emitted forward from each light-emitting body 45 passes through the inside of each light-shielding tube portion 63 and enters the base portion 81 of the transparent member 80. The light from each light-emitting body 45 that enters the base portion 81 enters each protrusion portion 82 from within the base portion 81 and is emitted to the outside of the housing 10 from the front surface of each protrusion portion 82. This allows the user to visually recognize each of the lights emitted from each light-emitting body 45 from outside the housing 10.

[0111] According to this embodiment, the inner member 60 accommodated inside the housing 10 has an opposing wall portion 61a disposed opposite the slit 33, and a first protruding wall portion 62a protruding from the opposing wall portion 61a toward the cover wall portion 31 and extending in the up-down direction Z, which is the extension direction of the slit 33. A second protruding wall portion 35 is formed on the surface of the cover wall portion 31 on the inner side of the housing 10, protruding from an edge portion of the periphery of the slit 33 in the left-right direction Y, which is the intersecting direction intersecting with the up-down direction Z, toward the opposing wall portion 61a and extending in the up-down direction Z. The first protruding wall portion 62a and the second protruding wall portion 35 have portions that overlap each other when viewed in the left-right direction Y. Therefore, as shown in FIG. 8, a labyrinth structure in which walls are intertwined in the front-rear direction X can be formed by the opposing wall portion 61a, the first protruding wall portion 62a, and the second protruding wall portion 35 at a position opposite the slit 33 inside the housing 10. As a result, even if liquid such as water seeps into the housing 10 through the slits 33, the liquid is easily blocked by at least a part of the opposing wall portion 61a, the first protruding wall portion 62a, and the second protruding wall portion 35, and the liquid can be prevented from reaching the electronic components inside the housing 10. Therefore, it is possible to prevent malfunctions in the electronic components accommodated inside the housing 10.

[0112] On the other hand, even if the opposing wall portion 61a, the first protruding wall portion 62a, and the second protruding wall portion 35 are provided, the gaseous refrigerant easily flows into the inside of the housing 10 through the gap between these walls and easily reaches the refrigerant sensor 52. Therefore, it is possible to prevent the refrigerant sensor 52 from being difficult to detect the refrigerant. In particular, in this embodiment, as described above, the opposing wall portion 61a, the first protruding wall portion 62a, and the second protruding wall portion 35 can block liquid such as water and make it difficult for the liquid to reach the electronic components in the housing 10, so that it is easy to make the slit 33 larger than in the past. This makes it possible to make the opening of the slit 33 relatively large, making it easier for the refrigerant to reach the refrigerant sensor 52 in the housing 10 through the slit 33, while preventing the liquid such as water from reaching the electronic components in the housing 10. Therefore, according to this embodiment, it is possible to prevent the accuracy of detecting the refrigerant by the refrigerant sensor 52 from decreasing, while preventing malfunctions from occurring in the electronic components housed inside the housing 10.

[0113] In the present embodiment, the “electronic components housed inside the housing 10” includes each component that constitutes the first board unit 40 and each component that constitutes the second board unit 50.

[0114] In this embodiment, liquid such as water blocked by the opposing wall 61a, the first protruding wall 62a, and the second protruding wall 35 flows vertically downward along the walls due to gravity and is discharged from the lower end of the slit 33 to the outside of the housing 10. In this embodiment, the slit 33 opens vertically downward, so that liquid such as water that flows vertically downward is easily discharged from the lower end of the slit 33 to the outside of the housing 10.

[0115] Furthermore, according to this embodiment, the second protruding wall portion 35 has a first wall portion 35a that protrudes from an edge portion in the left-right direction Y of the periphery of the slit 33 toward the opposing wall portion 61a, and a second wall portion 35b that protrudes in the left-right direction Y from a tip portion in the protruding direction of the first wall portion 35a and faces the slit 33. Therefore, liquid such as water that has entered from the slit 33 can be easily and suitably blocked by the second wall portion 35b of the second protruding wall portion 35, and the liquid such as water can be more suitably prevented from reaching the electronic components in the housing 10.

[0116] According to the present embodiment, the second wall portion 35b protrudes in the left-right direction Y toward the refrigerant sensor 52. Therefore, as shown in FIG. 8, the gap between the peripheral portion of the slit 33 and the tip end of the second wall portion 35b opens on the side where the refrigerant sensor 52 is located in the left-right direction Y. This makes it easier for the gaseous refrigerant that has flowed into the housing 10 from the slit 33 to flow to the refrigerant sensor 52, compared to a case where the gap opens on the opposite side to the side where the refrigerant sensor 52 is located in the left-right direction Y. Therefore, while the opposing wall portion 61a, the first protruding wall portion 62a, and the second protruding wall portion 35 prevent liquid such as water from reaching the electronic components in the housing 10, it is more preferable to prevent the gaseous refrigerant from becoming less likely to reach the refrigerant sensor 52. Therefore, it is more preferable to prevent the accuracy of refrigerant detection by the refrigerant sensor 52 from decreasing.

[0117] According to the present embodiment, the slits 33 and the second protruding wall portions 35 are provided in a plurality of units at intervals in the left-right direction Y. The first protruding wall portions 62a are provided in pairs, sandwiching the plurality of second protruding wall portions 35 in the left-right direction Y. Therefore, even if liquid such as water that has entered through each slit 33 flows to either side in the left-right direction Y over the second protruding wall portions 35, the liquid can be blocked in the left-right direction Y by one of the pair of first protruding wall portions 62a. This can more suitably prevent liquid such as water from reaching the electronic components in the housing 10. Furthermore, since the slits 33 are provided in a plurality of units, it is possible to easily allow the refrigerant to flow into the housing 10 through the plurality of slits 33. This can more suitably prevent the accuracy of detection of the refrigerant by the refrigerant sensor 52 from decreasing.

[0118] According to this embodiment, the vertically lower end of the facing wall 61a is disposed vertically above the surface of the inner surface of the housing 10 that is located vertically below. Therefore, liquid such as water that flows vertically downward due to gravity after being blocked by the facing wall 61a, the first protruding wall 62a, and the second protruding wall 35 can be made to flow into the gap between the facing wall 61a and the inner surface of the housing 10 and can be easily discharged from the slit 33 to the outside of the housing 10. In this embodiment, since the first protruding wall 62a and the second protruding wall 35 extend in the vertical direction (the up-down direction Z), liquid such as water that is blocked by each protruding wall can be easily made to flow vertically downward, and liquid such as water can be easily preferably discharged from the space below the facing wall 61a to the outside of the housing 10 through the slit 33.

[0119] According to the present embodiment, the inner member 60 has a stopper wall portion 61b located between the button body portion 72 of the button member 70 and the switch element 44. The protrusion portion 74 of the button member 70 is passed through a through hole 61d formed in the stopper wall portion 61b, faces the switch element 44, and can be moved toward the switch element 44 to press the switch element 44. The stopper wall portion 61b contacts the button body portion 72 in a state in which the protrusion portion 74 presses the switch element 44. Therefore, when the user presses the button member 70, the stopper wall portion 61b can support the button body portion 72 from the rear side (-X side). This can prevent the button body portion 72 from being pushed more than necessary and moving rearward. Therefore, it is possible to prevent excessive force from being applied from the protrusion portion 74 to the switch element 44, and to prevent excessive force from being applied to the notification element board 41 to which the switch element 44 is attached. Therefore, it is possible to prevent the switch element 44 and the notification element board 41 from being damaged.

[0120] In this manner, in this embodiment, the inner member 60, which has the function of preventing liquids such as water from reaching the electronic components as described above, also has the function of preventing the button member 70 from being pressed too far in. This makes it possible to obtain the effects of these two functions while preventing the number of components in the alarm 100 from increasing.

[0121] Moreover, according to this embodiment, the inner member 60 has a light-shielding tube portion 63 that extends from the light-emitting body 45 to the transparent member 80 and guides the light emitted from the light-emitting body 45 to the transparent member 80. Therefore, the light-shielding tube portion 63 can suppress the light emitted from the light-emitting body 45 from leaking to the outside of the housing 10 from other than the second opening 31b corresponding to the light-emitting body 45. This makes it easier for a user to visually recognize the light emitted from the light-emitting body 45 from outside the housing 10.

[0122] According to the present embodiment, the transparent member 80 has a base 81 disposed between the cover wall 31 and the light-shielding tube 63, and a protruding portion 82 protruding from the base 81 and inserted into the second opening 31b. The base 81 is in contact with the cover wall 31 and the light-shielding tube 63. Therefore, the light-shielding tube 63 of the inner member 60 can press the transparent member 80 against the cover wall 31. This allows the inner member 60 to prevent the transparent member 80 from shifting in the front-rear direction X. Furthermore, since the protruding portion 82 is inserted into the second opening 31b, the protruding portion 82 is caught on the inner surface of the second opening 31b, and the transparent member 80 can be prevented from shifting in the up-down direction Z and the left-right direction Y.

[0123] According to the present embodiment, the light emitters 45, the light shielding tubes 63, and the second openings 31b are provided at intervals in the vertical direction Z. The inner member 60 has a pair of first light shielding walls 62e that sandwich the transparent member 80 in the left-right direction Y. Therefore, the pair of first light shielding walls 62e can prevent the light from the light emitters 45 that enters the transparent member 80 from leaking in the left-right direction Y. In addition, the light shielding tubes 63 can prevent the light emitted from each light emitter 45 from mixing with each other. As a result, the light emitted from each light emitter 45 can be suitably sent to each of the protrusions 82 inserted into each of the second openings 31b. Therefore, the light emitted from each light emitter 45 can be more suitably and easily viewed by the user from the outside of the housing 10.

[0124] Further, according to this embodiment, the inner member 60 has a second light-shielding wall portion 62f that covers the transparent member 80 from one side in the vertical direction Z. The second light-shielding wall portion 62f connects the ends of the pair of first light-shielding wall portions 62e on one side in the vertical direction Z. Therefore, the second light-shielding wall portion 62f can suppress the light from the light-emitting body 45 that is incident on the transparent member 80 from leaking to one side in the vertical direction Z. In this embodiment, the second light-shielding wall portion 62f can suppress the light from the light-emitting body 45 that is incident on the transparent member 80 from leaking to the upper side. This makes it possible to more suitably send the light emitted from each light-emitting body 45 to each convex portion 82 inserted into each second opening 31b. Therefore, the light emitted from the light-emitting body 45 can be more suitably viewed by the user from the outside of the housing 10.

[0125] Furthermore, according to the present embodiment, the second light-shielding wall portion 62f covers the end portion of the transparent member 80 in the up-down direction Z that is closer to the inner surface of the housing 10 in the up-down direction Z. Therefore, the second light-shielding wall portion 62f can suitably prevent light from leaking to the outside of the housing 10 from the end portion of the transparent member 80 in the up-down direction Z that is closer to the inner surface of the housing 10 in the up-down direction Z.

[0126] In addition, even if light leaks from the end farther in the vertical direction Z of the transparent member 80 to the inner surface of the housing 10, the leaked light is unlikely to reach the inner surface of the housing 10 and is unlikely to leak to the outside of the housing 10. Therefore, even if the inner member 60 does not have a light-shielding wall portion that covers the end farther in the vertical direction Z of the transparent member 80 to the inner surface of the housing 10, the light emitted from the light emitter 45 is unlikely to leak to the outside of the housing 10 from other than the second opening 31b. In this embodiment, the transparent member 80 is covered from the bottom by the first rib portion 36a formed on the cover wall portion 31. Thereby, the first rib portion 36a can suppress the light incident on the transparent member 80 from leaking downward.

[0127] In this manner, in this embodiment, the inner member 60, which has the function of preventing liquids such as water from reaching the electronic components as described above, also has the function of suitably guiding light from the light emitter 45 to the outside of the housing 10. This makes it possible to obtain the effects of these two functions while preventing the number of components in the alarm 100 from increasing. As described above, in this embodiment, the inner member 60 also has the function of preventing the button member 70 from being pressed too hard. Therefore, in this embodiment, the effects of these three functions can be obtained with a single inner member 60.

[0128] According to the present embodiment, the light shielding ribs 37 formed on the cover wall 31 are passed through the holes 81a formed between the convex portions 82 of the base 81 of the transparent member 80 in the vertical direction Z from the front side (+X side). The light shielding ribs 37 protrude rearward (-X side) from the transparent member 80. The rear end of the light shielding rib 37 is located between the light shielding tube portions 63 adjacent to each other in the vertical direction Z. This prevents the light beams that pass through the light shielding tube portions 63 and enter the transparent member 80 from being blocked by the light shielding ribs 37 and from being mixed with each other. Therefore, the light beams emitted from the light emitters 45 through the convex portions 82 and the second openings 31b can be individually emitted to the outside of the housing 10.

[0129] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the configurations of the above-mentioned embodiments, and the following configurations and methods may also be adopted. The slits may have any shape as long as they extend in one direction. The extension direction of the slits may be any direction, and may be a direction other than the vertical direction. The number of slits is not particularly limited as long as it is one or more.

[0130] The inner member may have any configuration as long as it has an opposing wall portion and a first protruding wall portion. The opposing wall portion may have any shape as long as it is disposed opposite the slit. The first protruding wall portion may have any shape as long as it protrudes from the opposing wall portion toward the cover wall portion, extends in the extension direction of the slit, and has a portion overlapping with the second protruding wall portion when viewed in the intersecting direction. The number of first protruding walls is not particularly limited as long as it is one or more.

[0131] The second protruding wall portion may have any shape as long as it protrudes from the edge of the periphery of the slit in the cross direction intersecting with the extension direction toward the opposing wall portion, extends in the extension direction, and has a portion overlapping with the first protruding wall portion when viewed in the cross direction. The second wall portion of the second protruding wall portion may protrude in a direction away from the refrigerant sensor in the cross direction intersecting with the extension direction of the slit. The second protruding wall portion may not have a second wall portion. The second protruding wall portion may be composed of only the first wall portion. The third wall portion 35c in the above-mentioned embodiment may not be provided. The number of the second protruding wall portions is not particularly limited as long as it is one or more. When a plurality of slits are formed, it is sufficient that the second protruding wall portion is formed for at least one of the plurality of slits.

[0132] At least a part of the button body of the button member may be exposed to the outside of the housing through the first opening. The button body may be entirely exposed to the outside of the housing. The inner member may not have a stopper wall portion in contact with the button body. The inner member may not have a light-shielding tube portion, may not have a first light-shielding wall portion, and may not have a second light-shielding wall portion. When a light-shielding tube portion is provided, the number of light-shielding tube portions is not particularly limited as long as it is one or more. When a second light-shielding wall portion is provided, the second light-shielding wall portion may cover the end portion of the transparent member in the extension direction that is farther from the inner surface of the housing in the extension direction. The inner member may have a pair of light-shielding walls that sandwich the transparent member in the extension direction.

[0133] The refrigerant sensor may be any element capable of detecting the refrigerant. The refrigerant sensor may be a refrigerant sensor other than a semiconductor type. The notification element may be any element capable of notifying that the refrigerant sensor has detected the refrigerant. The notification element may be, for example, a display device such as a display capable of displaying characters or the like indicating that the refrigerant has been detected. The number of notification elements is not particularly limited as long as it is one or more.

[0134] The alarm of the present disclosure may be used in any manner. The alarm may be used to detect refrigerant leakage in a refrigeration cycle device other than an air conditioner, or may be used to detect refrigerant leakage in equipment other than a refrigeration cycle device. The location where the alarm is installed is not particularly limited. The configurations and methods described in this specification above can be appropriately combined within a range that does not contradict each other. [Explanation of symbols]

[0135] 10...housing, 31...cover wall portion, 31a...first opening, 31b...second opening, 33...slit, 35...second protruding wall portion, 35a...first wall portion, 35b...second wall portion, 41...notification element board, 42...speaker (notification element), 44...switch element, 45, 45a, 45c...light emitter, 45b...light emitter (notification element), 51...sensor board, 52...refrigerant sensor, 60 ...inner member, 61a...opposing wall portion, 61b...stopper wall portion, 61d...through hole, 62a...first protruding wall portion, 62e...first light-shielding wall portion, 62f...second light-shielding wall portion, 63...light-shielding tube portion, 70...button member, 72...button main body portion, 74...projection portion, 80...transparent member, 81...base portion, 82...convex portion, 100...alarm device, Y...left-right direction (crossing direction), Z...up-down direction (extension direction)

Claims

1. A refrigerant sensor capable of detecting a refrigerant; an alarm element capable of notifying that the refrigerant sensor has detected the refrigerant; a sensor substrate on which the refrigerant sensor is mounted; a housing for accommodating the sensor substrate therein; an inner member housed inside the housing; Equipped with the housing has a cover wall portion that covers the sensor board and the refrigerant sensor, The cover wall portion is formed with a plurality of slits extending in one direction and connecting the outside of the housing to the inside of the housing, The inner member includes: An opposing wall portion disposed opposite the plurality of slits; a first protruding wall portion protruding from the opposing wall portion toward the cover wall portion and extending in an extension direction of the slit; having A surface of the cover wall portion on the inner side of the housing is provided with a plurality of second protruding wall portions that protrude from edges of the respective peripheral portions of the plurality of slits in a direction intersecting with the extension direction toward the opposing wall portion and extend in the extension direction, The first protruding wall portion and each of the plurality of second protruding wall portions have portions that overlap with each other when viewed in the intersecting direction.

2. The second protruding wall portion is a first wall portion protruding from an edge portion of a periphery of the slit in the intersecting direction toward the opposing wall portion; a second wall portion protruding in the intersecting direction from a tip end portion in a protruding direction of the first wall portion and facing the slit; The alarm according to claim 1 , further comprising:

3. The alarm according to claim 2 , wherein the second wall portion protrudes in a direction approaching the refrigerant sensor in the intersecting direction.

4. The plurality of slits are provided at intervals in the intersecting direction, The second protruding wall portions are provided at intervals in the intersecting direction, The alarm according to claim 1 , wherein the first protruding wall portion is provided as a pair with the second protruding wall portions sandwiched therebetween in the intersecting direction.

5. The alarm according to claim 1 , wherein a vertically lower end of the opposing wall portion is disposed vertically above a vertically lower surface of the inner surface of the housing.

6. a notification element substrate on which the notification element is attached; A switch element attached to the notification element substrate; a button member including a button body at least a portion of which is exposed to the outside of the housing through a first opening formed in the cover wall portion and a protrusion extending from the button body toward the switch element; Equipped with the button body and the protrusion are movable toward the switch element, the button body is disposed between the inner member and the cover wall, the inner member has a stopper wall portion located between the button body portion and the switch element, the protrusion is passed through a through hole formed in the stopper wall portion, faces the switch element, and is capable of pressing the switch element by being moved toward the switch element, The alarm according to claim 1 , wherein the stopper wall portion comes into contact with the button body portion when the protrusion portion presses the switch element.

7. A light emitter accommodated inside the housing; A transparent member capable of transmitting light emitted from the light emitter; Equipped with the transparent member covers a second opening formed in the cover wall from inside the housing, The alarm according to claim 1 , wherein the inner member has a light-shielding tube portion that extends from the light emitter to the transparent member and guides the light emitted from the light emitter to the transparent member.

8. The transparent member is a base portion disposed between the cover wall portion and the light-shielding tube portion; a protrusion protruding from the base and inserted into the second opening; having The alarm according to claim 7 , wherein the base portion is in contact with the cover wall portion and the light-shielding tube portion.

9. the light emitting body, the light shielding tube portion, and the second opening portion are each provided in a plurality of portions at intervals in the extension direction, The alarm according to claim 7 , wherein the inner member has a pair of first light-shielding walls that sandwich the transparent member in the intersecting direction.

10. the inner member has a second light-shielding wall portion that covers the transparent member from one side in the extension direction, The alarm according to claim 9 , wherein the second light-shielding wall portion connects ends of the pair of first light-shielding wall portions on one side in the extension direction.

11. The alarm according to claim 10 , wherein the second light-shielding wall portion covers one of both end portions of the transparent member in the extension direction that is closer to an inner surface of the housing in the extension direction.

Images