JP5892748B2 - Alarm - Google Patents

Description

  The present invention relates to an alarm device, and more particularly to an alarm device used in an environment where waterproofness is required.

  Conventionally, an alarm device that detects a gas leak or carbon monoxide and issues an alarm, or detects an occurrence of a fire and issues an alarm is known. As this type of alarm device, for example, an alarm device provided with a gas sensor for detecting carbon monoxide in a bathroom or kitchen is known. In this case, a device body including an electronic component including a gas sensor and a substrate on which these are mounted is housed in a housing formed by fitting a pair of cases. By the way, when used in an environment such as a bathroom, liquid water is applied to the alarm device, so that it is important to take measures for waterproofing the device main body housed in the housing.

  Here, for example, Patent Literature 1 discloses a smoke detector attached to a ceiling board, and this detector includes a sensor base and a sensor head. The sensor head is formed by fitting a cap to a body, and a cylindrical core portion is provided at the center of the body. A drain hole is formed in the bottom surface of the body along the outer wall of the core portion.

  Moreover, for example, Patent Document 2 discloses a repeater for a fire alarm facility arranged outdoors. This repeater is composed of a main body, a substrate attached in the main body, and a cover that is attached to the main body so as to be freely opened and closed. A vertical wall is provided on the upper and both sides of the bottom plate in the main body of the repeater, and a waterproof wall higher than the vertical wall is provided on the inner side and the lower side.

  For example, Patent Document 3 discloses a fire detector that detects a fire. The sensing means included in the sensor includes a substrate and a lead wire extending from one surface of the substrate to the outside of the fire sensor, and the substrate is mounted on the one surface with the disaster sensor attached to the attachment portion as an upper side. It is housed with the side facing down. The lead wire extends upward from the lower side of the substrate, bypassing the outer edge of the substrate.

  Further, for example, Patent Literature 4 discloses a smoke detector. This smoke detector is configured to allow water that has entered the body to escape to the outside through a storage recess and a ventilation hole provided around the smoke detection chamber at a position below the circuit board on the side wall of the storage recess. 1 drain hole is formed through.

JP-A-11-265489 JP 11-306453 A JP 2000-194966 A JP 2003-248877 A

  By the way, in such an alarm device, in order to suppress the ingress of liquid water to the fitting region of the case, a device for improving water tightness is necessary. On the other hand, such a device is generated in the casing due to condensation or the like. There is a possibility that liquid water continues to stay inside.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an alarm device that suppresses inconvenience such as liquid water generated inside the housing staying inside while obtaining appropriate waterproofness. It is.

In order to solve such a problem, the present invention includes a first case for fixing a substrate on which an electronic component is mounted, and a vent hole penetrating the inside and the outside, and the first case is fitted into the first case. A second case that forms a casing with the first case, a frame-shaped packing sandwiched in a fitting region between the first case and the second case, and a plate installed on the surface of the second case And a non-woven fabric sandwiched between the first case and the second case so as to cover the vent hole. In this case, the second case is a box body having a frame-like side wall portion in which one side is opened and the upper wall portion is continuously provided on the other side, and the peripheral portion on the opening side in the side wall portion is the first side. A drainage groove for discharging liquid water generated inside the housing to the outside of the housing is provided while being configured to be fitted to the case. The drainage groove is formed on the inner peripheral surface of the side wall portion and extends in the first case direction, and a part of the peripheral edge portion on the opening side of the side wall portion at the extended position of the groove portion. The notch is set to a length that penetrates the inside and outside of the housing without being blocked by the packing.

  In the present invention, it is desirable that the water drain groove is formed in a region corresponding to the vertically lower side of the side wall portion when the alarm device is installed.

  In the present invention, it is desirable that the water drain grooves are formed in at least two locations in an independent state.

  Further, in the present invention, the first case includes a shielding portion standing so as to protrude along the side wall portion of the second case, and the shielding portion is a fitting portion with the second case. In the peripheral part of 1 case, it is preferable that it is provided corresponding to the drain groove.

  According to the present invention, the frame-shaped packing is sandwiched in the fitting region between the first case and the second case, thereby improving the water tightness in the fitting region between the cases by a simple assembly operation. Can do. Further, since the second case is provided with a water drain groove, it is possible to discharge liquid water generated inside the housing. Thereby, the problem that the liquid water which arises inside a housing | casing retains inside can be suppressed, obtaining appropriate waterproofness.

The front view which shows typically the structure of the alarm device concerning this embodiment AA sectional view of the alarm device shown in FIG. Explanatory drawing which expands and shows the area | region A shown in FIG. Explanatory drawing of the alarm device viewed from below vertically based on the installation status of the alarm device

  FIG. 1 is a front view schematically showing the configuration of the alarm device 1 according to the present embodiment, and FIG. 2 is a cross-sectional view taken along line AA of the alarm device 1 shown in FIG. In FIGS. 1 and 2, the upper side of the paper corresponds to the vertical upper side when the alarm device 1 is installed, and the lower side of the paper corresponds to the lower vertical side when the alarm device 1 is installed. Examples of the alarm device 1 according to this embodiment include a gas leak alarm device, a fire alarm device, a composite alarm device, and the like, and in particular, splashed liquid water such as a bathroom, a kitchen, and a kitchen is applied to the alarm device 1. It is suitable for the alarm device 1 used in an environment where waterproofness is required.

  The alarm device 1 is installed and used, for example, on a wall of a bathroom or a kitchen, and detects an abnormal state such as a gas leak occurring at the installation location to give an alarm. The alarm device 1 is mainly composed of a substrate 2, a lower case 3, and an upper case 4. The lower case 3 and the upper case 4 are fitted together to form a housing, and the substrate 2 is placed in the housing. Is housed. When this alarm device 1 is installed, it is fixed to a wall or the like with the lower case 3 side as the back surface.

  The substrate 2 is a printed wiring board, and a plurality of types of electronic components such as a gas sensor 20, an alarm buzzer, and a transformer are mounted by soldering or the like. The substrate 2 has a wiring pattern that is electrically connected to the mounted electronic component to form an electric circuit.

  The lower case 3 is a case for fixing the substrate 2 on which electronic components are mounted, and is formed of synthetic resin or the like. The lower case 3 is a plate-like body having a substantially rectangular appearance, and includes a base portion 30 and a support portion 31 integrally formed with the base portion 30. The peripheral portion of the base 30 functions as a fitting portion with the upper case 4, and the lower case 3 is fitted with the upper case 4 to form a casing together with the upper case 4. The support unit 31 supports the substrate 2 to fix the substrate 2.

  In the lower case 3, a columnar abutting portion 32 is integrally erected at a predetermined position of the base 30, and this abutting portion 32 is formed when the lower case 3 and the upper case 4 are fitted together. Butt against the abutting portion 44 formed in the upper case 4. A threaded hole 32 a that penetrates is formed inside the abutting portion 32 of the lower case 3, and this threaded hole 32 a is formed when the abutting portion 32 abuts against the abutting portion 44 of the upper case 4. The upper case 4 communicates with a screw hole 44 a formed in the abutting portion 44. And each screw hole 32a, 44a is fastened with a screw (not shown), whereby the lower case 3 and the upper case 4 are fixed.

  Further, the lower case 3 is integrally formed with the base portion 30 with a shielding portion 33 erected so as to protrude along the side wall portion 42 of the upper case 4. The shielding portion 33 is disposed at a position close to the peripheral edge portion of the base portion 30 corresponding to the fitting portion with the upper case 4, and particularly provided in a position corresponding to the drain groove 45 described later. Yes.

  The upper case 4 is a case that is fitted to the lower case 3 to form a housing that accommodates the device main body including the substrate 2 and the like together with the lower case 3 and is formed of synthetic resin or the like. The upper case 4 is a box that includes a frame-like side wall 42 that is open at one end and has an upper wall 41 connected to the other, and has a substantially rectangular appearance when viewed from the front.

  A pillar-shaped abutting portion 43 is erected integrally at a predetermined position of the upper wall portion 41, and this abutting portion 43 is formed corresponding to the abutting portion 32 of the lower case 3. Has been. A screw hole 44 a is formed in the abutting portion 43.

  The upper wall portion 41 is formed with a vent hole 44 penetrating inside and outside. The vent 44 allows air outside the casing to be taken into the casing formed by the upper and lower cases 3, 4, that is, into the sensor chamber including the gas sensor 20 mounted on the substrate 2.

  A nonwoven fabric 6 is arranged on the surface side of the upper wall portion 41 in order to prevent liquid water from entering the sensor chamber from the vent 44. The nonwoven fabric 6 does not need to be disposed so as to cover the entire surface of the upper wall portion 41, and is at least disposed so as to cover the vent hole 44 at a position corresponding to the vent hole 44. It ’s enough. The nonwoven fabric 6 is held on the surface of the upper wall portion 41 by being sandwiched between the display plate 7 disposed on the surface of the upper wall portion 41.

  A substantially square display plate 7 is disposed in the central region on the surface side of the upper wall portion 41. The display plate 7 displays display designs (symbols) indicating various states. For example, the display plate 7 displays a normal state or an abnormal state through lighting of an LED disposed behind the display design. The display plate 7 is formed with a plurality of slits 71 corresponding to the vent holes 44 formed in the upper wall portion 41 so as not to obstruct the ventilation by the vent holes 44. Is given.

  The side wall part 42 is, for example, a frame (tubular body) formed in a rectangular shape, and the peripheral part on the opening side corresponds to the peripheral shape of the base part 30 in the lower case 3. The peripheral edge portion on the opening side of the side wall portion 42 is configured to be fitted to the peripheral edge portion of the base portion 30 of the lower case 3.

  An annular packing 5 is disposed around the base 30 of the lower case 3 when the upper and lower cases 3 and 4 are fitted, and after the packing 5 is interposed, The peripheral edge part and the peripheral part of the base part 30 of the lower case 3 are fitted together. In other words, the casing formed by the upper and lower cases 3 and 4 is configured in a state where the packing 5 is sandwiched in the fitting region between the lower case 3 and the upper case 4. Thereby, the device which improves the waterproofness in the fitting area | region of the lower case 3 and the upper case 4 is given.

  Further, in the present embodiment, the side wall portion 42 is formed with a water draining groove 45 for discharging liquid water generated inside the housing to the outside of the housing. The drainage groove 45 is formed in a region 42L corresponding to the vertically lower side of the side wall portion 42 when the alarm device 1 is installed, so that the liquid water naturally flows out under the force of its own weight.

  FIG. 3 is an explanatory view showing the area A shown in FIG. 2 in an enlarged manner, and FIG. 4 is an explanatory view of the alarm device 1 viewed from vertically below with the installation state of the alarm device 1 as a reference. The drainage grooves 45 are formed at two locations independently of each other, and each drainage groove 45 is composed of a groove part 45a and a notch part 45b. The groove part 45a is formed on the inner peripheral surface of the side wall part 42 and extends, for example, in a straight line toward the lower case 3. On the other hand, the notch 45b is formed by notching a part of the side wall 42 at the extended position of the groove 45a, and is long enough to communicate the inside and outside of the housing without being blocked by the packing 5 or the like. Is set.

  Thus, according to the alarm device 1 of this embodiment, the following merit can be enjoyed. For example, when an alarm is installed in a place where liquid water is splashed, such as in a bathroom or a kitchen, waterproof performance is important for preventing liquid water from splashing on the device body including electronic components and substrates. By the way, in this kind of alarm device, since the apparatus main body is housed in a casing in which the upper and lower cases are fitted together, an attempt to ensure waterproofness in the fitting region between the cases has been made. As such an attempt, there is a method of molding a device body using a potting agent or the like.

  In the alarm device 1 of this embodiment, a lower case 3 and an upper case 4 are fitted together to form a casing, and an apparatus main body including an electronic component such as a gas sensor 20 and a board 2 on which the electronic sensor is mounted is accommodated in the casing. ing. In this case, the waterproof property of the fitting region between the lower case 3 and the upper case 4 is ensured by sandwiching the packing 5 in the fitting region between the upper and lower cases 3 and 4. Thereby, since the water tightness of a fitting area | region can be improved, the situation where the liquid water which splashed by the shower etc. approached into the inside of a housing | casing can be suppressed. In addition, by using the packing 5 in this manner, the manufacturing process of the alarm device 1 is simplified while ensuring waterproofness as in the case of the mold, so that the assembling work can be easily performed.

  Moreover, the alarm device 1 requires a sensor for detecting an abnormality such as a gas sensor 20 as a component. This type of sensor needs to be provided with a vent 44 for venting the inside and outside of a housing (sensor chamber) in which the gas sensor 20 is housed in order to detect a subject such as a gas contained in the atmosphere around the alarm device 1. There is. However, since there is a concern that liquid water may enter the housing from the vent 44, in the present embodiment, the vent 44 is covered with the nonwoven fabric 6 so that liquid water such as water droplets directly from the vent 44. Intrusion.

  By the way, although the nonwoven fabric can suppress the ingress of liquid water such as large droplets, it is difficult to prevent the ingress of water vapor contained in the outside air. Saturated water vapor condenses and is generated as liquid water inside the housing. By the way, from the viewpoint of waterproofness, by adopting a configuration in which the water tightness of the fitting area of each case is enhanced by packing, the liquid water generated inside the housing is hardly discharged to the outside, and condensation occurs. By being repeated, liquid water continues to accumulate inside the housing. Such liquid water can cause a failure of an electronic component such as a short circuit.

  Furthermore, in the case of a structure in which the water tightness of the fitting area is enhanced by packing and the vent is covered with a nonwoven fabric, a pressure difference may be generated inside and outside the housing due to a sudden temperature change in the ambient environment of the alarm device, for example. It can happen. In this case, the liquid water adhering to the vicinity of the fitting area of the upper and lower cases may be sucked into the housing due to the pressure difference.

  In this regard, according to the alarm device 1 of the present embodiment, the upper case 4 includes the water drain groove 45 that discharges liquid water generated inside the housing to the outside of the housing. Specifically, the drainage groove 45 is formed on the inner peripheral surface of the side wall part 42 and extends toward the lower case 3, and a part of the side wall part 42 is located at an extended position of the groove part 45 a. It is comprised with the notch part 45b formed by notching. Thereby, even if liquid water is generated inside the housing, it can be discharged to the outside, so that a situation in which liquid water continues to accumulate inside the housing can be suppressed. Therefore, it is possible to eliminate the cause of the failure that can occur in the electronic component.

  Further, due to the presence of the drainage groove 45, there is a portion where the inside and outside of the housing are partially communicated. Due to the presence of such a communication portion, it is possible to suppress the occurrence of a pressure difference between the inside and outside of the housing caused by a rapid temperature change. Thereby, it is possible to suppress the occurrence of a situation in which liquid water attached in the vicinity of the fitting region of the upper and lower cases 3 and 4 is sucked into the housing due to the pressure difference.

  Further, in the present embodiment, the water draining groove 45 is formed in the region 42L corresponding to the vertically lower side of the side wall portion 42 when the alarm device 1 is installed, so that the liquid water generated inside the housing is caused by its own weight. , Can flow smoothly out of the housing. Thereby, discharge of liquid water can be realized smoothly.

  Moreover, in this embodiment, the water draining groove | channel 45 is formed in two places in the state which each became independent. According to such a configuration, even if one of the water draining grooves 45 is blocked by soap or oil, liquid water can be discharged by the remaining water draining grooves 45. In addition, the number of the water drain grooves 45 should just be formed in at least two places, and you may provide the number beyond it.

  Further, the lower case 3 includes a shielding portion 33 erected so as to protrude along the side wall portion 42 of the upper case 4, and the shielding portion 33 is a portion of the lower case 3 that is a fitting portion with the upper case 4. In the peripheral part of the base part 30, it is provided corresponding to the drain groove 45 in a position. According to such a configuration, a situation in which liquid water bounced off from the floor or the like and liquid water flowing down the surface of the casing enters the interior of the casing through the draining groove 45 is caused in the draining groove 45. It can stop by the shielding part 33 which protruded with respect to it. Thereby, the fall of waterproofness can be suppressed.

  The alarm device according to this embodiment has been described above, but the present invention is not limited to this embodiment, and various modifications can be made within the scope of the invention. For example, the alarm device can take various forms other than a rectangular shape. In addition to the sensor housed in the alarm device (housing), the ambient state of the alarm device can be changed. Various sensors to be detected can be used alone or in combination.

DESCRIPTION OF SYMBOLS 1 Alarm 2 Board | substrate 20 Gas sensor 3 Lower case 31 Support part 32 Abutting part 32a Screw hole 33 Shielding part 4 Upper case 41 Upper wall part 42 Side wall part 43 Abutting part 43a Screw hole 44 Ventilation hole 45 Water drain groove 45a Groove part 45b Notch 5 Packing 6 Nonwoven fabric 7 Display plate

Claims (4)

A first case for fixing a substrate on which electronic components are mounted;
A second case in which a vent hole penetrating the inside and outside is formed and fitted into the first case to form a housing with the first case;
A frame-shaped packing sandwiched in a fitting region between the first case and the second case;
A nonwoven fabric disposed between the plate placed on the surface of the second case and the second case and arranged to cover the vent;
The second case is a box having a frame-shaped side wall part in which one side is opened and an upper wall part is continuously provided on the other side, and the peripheral part on the opening side of the side wall part is the same as the first case. It is configured to be fitted , and includes a water drain groove for discharging liquid water generated inside the housing to the outside of the housing ,
The drain groove is
A groove formed on the inner peripheral surface of the side wall and extending toward the first case;
In the extended position of the groove portion, it is constituted by a notch portion formed by notching a part of the peripheral edge portion on the opening side in the side wall portion,
The said notch is set to the length which penetrates the inside and outside of the said housing | casing, without being interrupted by the said packing, The alarm device characterized by the above-mentioned.   2. The alarm device according to claim 1, wherein the water draining groove is formed in a region corresponding to a vertically lower side of the side wall portion when the alarm device is installed.   3. The alarm device according to claim 1, wherein the water drain grooves are formed in at least two locations in an independent state. 4.   The first case includes a shielding portion erected so as to protrude along the side wall portion of the second case,
  The said shielding part is provided in the peripheral part of said 1st case which is a fitting part with a 2nd case so as to correspond with the said water draining groove | channel. The alarm device described in any one of 3.

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