WO2012123795A1 - Smoke detector - Google Patents
Smoke detector Download PDFInfo
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- WO2012123795A1 WO2012123795A1 PCT/IB2012/000441 IB2012000441W WO2012123795A1 WO 2012123795 A1 WO2012123795 A1 WO 2012123795A1 IB 2012000441 W IB2012000441 W IB 2012000441W WO 2012123795 A1 WO2012123795 A1 WO 2012123795A1
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- WIPO (PCT)
- Prior art keywords
- smoke
- sensor
- sensor cover
- cover
- structure support
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
- G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
- G08B17/113—Constructional details
Definitions
- the present invention relates to a smoke detector that detects a fire or the like by detecting smoke.
- smoke detectors have been installed to detect smoke during a fire.
- This smoke detector has a light emitting part and a light receiving part in a smoke sensing space in which a plurality of labyrinth walls are arranged, and the light receiving part receives scattered light from the smoke flowing into the smoke sensing area between adjacent labyrinth walls. To do. Then, the amount of light received by the light receiving unit is converted into a light reception signal, and a fire alarm is issued when the light reception signal exceeds a certain threshold.
- a conventional smoke detector is shown in FIG.
- the smoke detector 6 is configured by combining a body cover 60 and a sensor cover 61.
- a circuit board is housed inside the body cover 60, and inside the sensor cover 61, an insect repellent cover 62 that prevents insects and the like from entering the smoke sensing area, optical members such as a light emitting part and a light receiving part, and a labyrinth wall And the like.
- the sensor cover 61 is formed in a bottomed cylindrical shape, and in order to prevent a user's finger from coming into contact with an optical component housed therein, a vertical outer structure support portion 61a and a lateral outer structure support portion are provided on the side surface. 61b is formed.
- a smoke detector configured so that the smoke flowing into the smoke detection chamber is easily guided to the smoke sensing area (see, for example, Patent Document 1). JP 2008-310730 A
- the vertical outline support 61a and the horizontal outline support are provided on the side surface of the sensor cover 61. It is necessary to form the part 61b.
- the manufacture of the sensor cover 61 having such a structure requires a complicated mold, leading to an increase in the cost of the smoke detector 6.
- many outer structure support portions such as the vertical outer structure support portion 61 a and the lateral outer structure support portion 61 b are provided on the side surface of the sensor cover 61, smoke flows into the smoke detection area in the sensor cover 61.
- the smoke detection sensitivity of the smoke detector 6 cannot be maintained.
- the present invention has been made in view of the above problems, and provides a smoke detector that can reduce the cost of manufacturing a sensor cover and a body cover and that does not obstruct the flow of smoke to the smoke detection area. With the goal.
- the present invention provides a smoke sensor unit for detecting smoke by surrounding a plurality of labyrinth walls and receiving scattered light from smoke flowing in between the labyrinth walls,
- a smoke detector including a sensor cover that houses a smoke sensor unit and a body cover that is provided continuously to the sensor cover, the sensor cover is a bottomed cylinder, and the side surface of the sensor cover A plurality of outer shell structure support portions and openings only in the vertical direction are alternately formed.
- the sensor cover and the body cover integrally constitute an outline of the smoke detector.
- the adjacent outer structure support portions are formed at intervals such that the user's fingers cannot touch the components housed in the sensor cover.
- a part of the plurality of outer structure support portions is in contact with the smoke sensor portion and the other portion is not in contact with the smoke sensor portion.
- the outer structure support portion in contact with the smoke sensor portion and the outer structure support portion not in contact with the smoke sensor portion are alternately formed.
- the smoke sensor according to the present invention has a structure in which a plurality of outer shell structure support portions and openings only in the vertical direction are alternately formed on the side surface of the bottomed cylindrical sensor cover.
- the mold can be simplified to reduce the manufacturing cost.
- a part of the outer structure support part on the side surface of the sensor cover is configured to contact the smoke sensor part and the other part does not contact the smoke sensor part, the outer structure support part is configured to prevent smoke from entering the smoke detection area. Interfering with the flow can be reduced.
- the smoke detector 1 receives scattered light of smoke that has flowed into the smoke-sensitive area from the gaps of a plurality of labyrinth walls, converts the amount of received light into a received light signal, and the received light signal is a threshold value. It is a device that gives a fire alarm when it exceeds.
- the outer shell of the smoke detector 1 includes a base 10, a sensor cover 11, and a body cover 12.
- the base 10 is formed of a substantially disk-shaped resin or the like. For example, screw holes are formed in two places on the installation surface side for screwing to the ceiling surface 2.
- the internal structure of the smoke detector 1 will be described with reference to FIG.
- the smoke detector 1 includes a sensor cover 11 and a body cover 12 in which a plurality of components such as a circuit board 13, an optical base (smoke sensor unit) 14, an insect-proof cover 15, and a speaker 16 are accommodated.
- the sensor cover 11 accommodates the optical base 14, the insect-proof cover 15, and the speaker 16 inside, and has a role as a protective cover for protecting these members.
- the sensor cover 11 is formed in a bottomed cylindrical shape, and a plurality of outer shell structure support portions 11a and openings 11b are formed alternately on the side surface. Smoke from the outside enters the smoke sensing space on the optical base 14 through the opening 11b, through the opening of the insect screen of the insect protection cover 15, and so on.
- the body cover 12 accommodates the circuit board 13 therein and is coupled to the base 10 by rotating clockwise while approaching the base 10.
- the sensor cover 11 and the body cover 12 are integrally formed.
- the sensor cover 11 and the body cover 12 are formed of a metal part as a core material and an insulating resin coated around the metal part.
- the circuit board 13 is mounted with circuit components such as a microcomputer that monitors the optical elements of the light emitting diodes and photodiodes and the light reception signal and outputs a fire alarm signal when the threshold value is exceeded.
- the optical base 14 is installed on the circuit board 13 and includes a substantially disk-shaped bottom plate and a peripheral wall formed on the periphery of the bottom plate, and a light emitting unit and a light receiving unit are provided on the top surface of the bottom plate. As will be described later, the optical base 14 is provided with a plurality of labyrinth walls along the peripheral wall, and a portion surrounded by the plurality of labyrinth walls serves as a smoke sensing space.
- the labyrinth wall guides smoke entering from the side surface of the sensor cover 11 to a smoke sensing area at a substantially central portion of the smoke sensing space, and blocks the outside light entering the smoke sensing area. Inwardly, it is bent into a substantially “ ⁇ ” shape in plan view.
- the light emitting part and the light receiving part formed on the optical base 14 accommodate light emitting diodes and photodiodes attached to the upper surface of the circuit board 13.
- the insect repellent cover 15 has a structure having an insect repellent net so that insects, dust, and the like do not enter the smoke sensing region, and is configured so that the lower end thereof is fitted to the peripheral wall of the optical base 14.
- a speaker 16 is fitted on the top surface of the insect-proof cover 15.
- the speaker 16 has a function of sounding an alarm sound for notifying that a fire has been detected.
- the sensor cover 11 has a bottomed cylindrical shape, and a plurality of outer shell structure support portions 11 a and openings 11 b only in the vertical direction are alternately formed on the side surface. This is because when the vertical and horizontal outer structure support portions are formed on the sensor cover 11, the metal molding die as a core material becomes complicated, and as a result, the cost of the smoke detector 1 increases. .
- a plurality of outer structure support portions 11a only in the vertical direction are formed on the side surface of the sensor cover 11, and the outer cover structure support portions in the horizontal direction are not formed, so that the mold of the sensor cover 11 is formed.
- the structure of the mold can be simplified, and the sensor cover 11 and the body cover 12 can be integrally manufactured. As a result, it is possible to reduce the cost when manufacturing the smoke detector 1.
- the arrangement and shape of the vertical outline structure support portion 11a formed on the side surface of the sensor cover 11 will be described with reference to FIG.
- a light emitting portion 14c is provided in a smoke sensing space 14b in which a plurality of labyrinth walls 14a are provided.
- An optical base 14 that receives light by the light receiving portion 14d is fitted.
- Adjacent vertical outer structure support portions 11a formed on the side surface of the sensor cover 11 are formed at intervals such that the user's fingers cannot touch the components housed inside the sensor cover.
- the phase difference ⁇ formed by the radial lines of adjacent outer structure support portions 11 a is 22.5 degrees.
- the sensor cover 11 is configured such that a part of the plurality of outer structure support portions 11 a formed on the side surface is in contact with the optical base 14 and the other outer structure support portions 11 a ′ are not in contact with the optical base 14. ing.
- FIG. 4 shows a case where the outer structure support portion 11a that contacts the optical base 14 and the outer structure support portion 11a ′ that does not contact the optical base 14 are alternately formed. This is for preventing the smoke detection capability of the smoke detector 1 from deteriorating due to the outer structure support portion 11a obstructing the intrusion of smoke into the smoke sensing space 14b. The above will be described with reference to FIG. FIG.
- FIG. 5A shows the atmospheric pressure distribution around the smoke sensing space when the sensor cover 11 and the optical base 14 according to the present embodiment are used.
- FIG. 5B shows the pressure distribution around the smoke sensing space when using the sensor cover 21 and the optical base 24 having the arrangement and shape of the conventional outer structure support portion 21a.
- arrows Y1 to Y3 indicate the air flow Y1 from the side surfaces of the sensor covers 11, 21, the smoke path Y2 in the optical base 14, and the smoke path Y3 in the optical base 24.
- region 3a) in a figure turns into an area
- the boundary between the high pressure region 3a and the low pressure region 3b in the periphery of the smoke detection space of the optical base 14 is mainly in the arrangement and shape of the outer structure support portions 11a and 21a located at acute angles with respect to the smoke flow. It is determined based on this.
- the sensor cover 11 having the outer structure support portions 11a and 11a ′ shown in FIG. 5 (a) is more effective than the sensor cover 21 having the outer structure support portion 21a shown in FIG. 5 (b). It can be seen that the pressure difference in the inflow region 3c is small. Therefore, in the case of FIG.
- the smoke flow path Y ⁇ b> 2 and the low pressure region 3 b are separated, the smoke reaches the smoke detection space, and the smoke detection region (near the center) of the optical base 14. Smoke is less likely to flow out before passing through. As a result, it is possible to prevent the smoke detection capability of the smoke detector 1 from being lowered.
- the path Y3 through which the smoke flows and the low pressure area 3b are relatively close to each other, and as shown in the path Y3, the smoke is exposed to the outside before passing through the smoke detection area (near the center). The smoke detection capability of the smoke detector 1 is reduced.
- the sensor cover 11 it is possible to reduce as much as possible that the outer structure support portions 11a and 11a 'block the intrusion of smoke into the smoke sensing space, and the smoke of the smoke detector 1 can be reduced. Decrease in detection capability can be prevented.
- the insect screen provided in the insect cover 15 also resists the inflow of fluid into the optical base 14. For this reason, the flow that has reached the side surface of the optical base 14 may be resisted by the insect screen and may not flow into the smoke sensing space 14b. If the outer structure support portion of the sensor cover 11 is configured only by the outer structure support portion 11a ′ that does not contact the insect screen in order to ensure the inflow of smoke, the structural strength and the design property are deviated.
- the sex is secured.
- the sensor cover 11 of the smoke detector 1 according to the present embodiment has a bottomed cylindrical shape, and a plurality of outer shell structure support portions 11a and openings 11b only in the vertical direction are alternately arranged on the side surface. Is formed. For this reason, the mold at the time of manufacture of the sensor cover 11 can be simplified, and the sensor cover 11 and the body cover 12 can be integrated. Therefore, cost reduction during manufacturing can be realized.
- the adjacent vertical structure support portions 11 a of the sensor cover 11 are formed at a predetermined interval or less, so that the user's fingers can be prevented from touching the optical components housed in the sensor cover 11. Further, since the outer structure support portion 11a in contact with the optical base 14 and the outer structure support portion 11a ′ not in contact with the optical base 14 are alternately formed, smoke to the smoke sensing space on the optical base 14 is formed. It is possible to efficiently guide the flow of the smoke and secure the structural strength and design of the smoke detector 1.
- the present invention is not limited to the configuration of the above embodiment, and various modifications can be made without departing from the spirit of the invention. The preferred embodiments of the present invention have been described above, but the present invention is not limited to these specific embodiments, and various modifications and variations that do not depart from the scope of the claims are possible. It belongs to the category of the present invention.
Abstract
A smoke detector (1) is provided with: a smoke detecting section which is surrounded by a plurality of labyrinth walls and detects smoke by receiving light scattered by the inflow of smoke from between the labyrinth walls; a sensor cover (11) which internally accommodates at least the smoke detecting section; and a body cover (12) installed consecutively to the sensor cover (11). The sensor cover (11) has a bottomed cylindrical shape, and a plurality of outer shell structure support sections (11a) extending in only the vertical direction and openings (11b) are arranged in alternating order on the side surface of the sensor cover (11). This sensor cover (11) configuration simplifies the mold for the sensor cover (11) and reduces the production cost of the smoke detector (1).
Description
本発明は、煙を感知することで火災などを検知する煙感知器に関する。
The present invention relates to a smoke detector that detects a fire or the like by detecting smoke.
従来より、火災時などにおける煙を感知する煙感知器が設置されている。この煙感知器は、複数のラビリンス壁を周設した煙感知空間内に発光部及び受光部を有し、隣接するラビリンス壁間から煙感知領域に流入してきた煙による散乱光を受光部で受光する。そして、この受光部で受光した光量を受光信号に変換し、受光信号がある閾値を超えたときに火災警報を発報する。
従来の煙感知器を図６に示す。煙感知器６は、ボディカバー６０とセンサカバー６１とを組み合わせて構成される。ボディカバー６０の内部には回路基板が収容され、センサカバー６１の内部には、虫などが煙感知領域に侵入することを防止する防虫カバー６２や、発光部、受光部などの光学部材とラビリンス壁とを備えた光学基台６３などが収容される。センサカバー６１は、有底円筒形状で形成され、ユーザの手指が内部に収容される光学部品に接触することを防止するため、側面には上下方向外郭構造支持部６１ａと横方向外郭構造支持部６１ｂが形成される。
また、煙感知室内に流入した煙が、感煙領域へと誘導され易いように構成した煙感知器が知られている（例えば、特許文献１参照）。
特開２００８−３１０７３０号公報
Conventionally, smoke detectors have been installed to detect smoke during a fire. This smoke detector has a light emitting part and a light receiving part in a smoke sensing space in which a plurality of labyrinth walls are arranged, and the light receiving part receives scattered light from the smoke flowing into the smoke sensing area between adjacent labyrinth walls. To do. Then, the amount of light received by the light receiving unit is converted into a light reception signal, and a fire alarm is issued when the light reception signal exceeds a certain threshold.
A conventional smoke detector is shown in FIG. The smoke detector 6 is configured by combining a body cover 60 and a sensor cover 61. A circuit board is housed inside the body cover 60, and inside the sensor cover 61, an insect repellent cover 62 that prevents insects and the like from entering the smoke sensing area, optical members such as a light emitting part and a light receiving part, and a labyrinth wall And the like. The sensor cover 61 is formed in a bottomed cylindrical shape, and in order to prevent a user's finger from coming into contact with an optical component housed therein, a vertical outer structure support portion 61a and a lateral outer structure support portion are provided on the side surface. 61b is formed.
There is also known a smoke detector configured so that the smoke flowing into the smoke detection chamber is easily guided to the smoke sensing area (see, for example, Patent Document 1).
JP 2008-310730 A
従来の煙感知器を図６に示す。煙感知器６は、ボディカバー６０とセンサカバー６１とを組み合わせて構成される。ボディカバー６０の内部には回路基板が収容され、センサカバー６１の内部には、虫などが煙感知領域に侵入することを防止する防虫カバー６２や、発光部、受光部などの光学部材とラビリンス壁とを備えた光学基台６３などが収容される。センサカバー６１は、有底円筒形状で形成され、ユーザの手指が内部に収容される光学部品に接触することを防止するため、側面には上下方向外郭構造支持部６１ａと横方向外郭構造支持部６１ｂが形成される。
また、煙感知室内に流入した煙が、感煙領域へと誘導され易いように構成した煙感知器が知られている（例えば、特許文献１参照）。
A conventional smoke detector is shown in FIG. The smoke detector 6 is configured by combining a body cover 60 and a sensor cover 61. A circuit board is housed inside the body cover 60, and inside the sensor cover 61, an insect repellent cover 62 that prevents insects and the like from entering the smoke sensing area, optical members such as a light emitting part and a light receiving part, and a labyrinth wall And the like. The sensor cover 61 is formed in a bottomed cylindrical shape, and in order to prevent a user's finger from coming into contact with an optical component housed therein, a vertical outer structure support portion 61a and a lateral outer structure support portion are provided on the side surface. 61b is formed.
There is also known a smoke detector configured so that the smoke flowing into the smoke detection chamber is easily guided to the smoke sensing area (see, for example, Patent Document 1).
しかしながら、上述した煙感知器６においては、ユーザの手指が内部に収容される光学部品に接触することを防止するため、センサカバー６１の側面に上下方向外郭構造支持部６１ａ及び横方向外郭構造支持部６１ｂを形成する必要がある。このような構造を有するセンサカバー６１の製造には、複雑な金型が必要となり、煙感知器６のコストアップに繋がるという問題がある。
また、センサカバー６１の側面に上下方向外郭構造支持部６１ａや横方向外郭構造支持部６１ｂなどの多くの外郭構造支持部を設けると、センサカバー６１内の煙感知領域に煙が流入するのを妨げ、煙感知器６の煙検知感度を保持できないという問題もある。
本発明は、上記課題に鑑みてなされたものであり、センサカバーやボディカバーの製造時のコスト削減を図り、かつ煙感知領域への煙の流れを妨害しないようにした煙感知器を提供することを目的とする。 However, in the smoke detector 6 described above, in order to prevent the user's fingers from coming into contact with the optical components accommodated therein, the vertical outline support 61a and the horizontal outline support are provided on the side surface of the sensor cover 61. It is necessary to form the part 61b. The manufacture of the sensor cover 61 having such a structure requires a complicated mold, leading to an increase in the cost of the smoke detector 6.
Further, if many outer structure support portions such as the vertical outer structure support portion 61 a and the lateral outer structure support portion 61 b are provided on the side surface of the sensor cover 61, smoke flows into the smoke detection area in the sensor cover 61. There is also a problem that the smoke detection sensitivity of the smoke detector 6 cannot be maintained.
The present invention has been made in view of the above problems, and provides a smoke detector that can reduce the cost of manufacturing a sensor cover and a body cover and that does not obstruct the flow of smoke to the smoke detection area. With the goal.
また、センサカバー６１の側面に上下方向外郭構造支持部６１ａや横方向外郭構造支持部６１ｂなどの多くの外郭構造支持部を設けると、センサカバー６１内の煙感知領域に煙が流入するのを妨げ、煙感知器６の煙検知感度を保持できないという問題もある。
本発明は、上記課題に鑑みてなされたものであり、センサカバーやボディカバーの製造時のコスト削減を図り、かつ煙感知領域への煙の流れを妨害しないようにした煙感知器を提供することを目的とする。 However, in the smoke detector 6 described above, in order to prevent the user's fingers from coming into contact with the optical components accommodated therein, the vertical outline support 61a and the horizontal outline support are provided on the side surface of the sensor cover 61. It is necessary to form the part 61b. The manufacture of the sensor cover 61 having such a structure requires a complicated mold, leading to an increase in the cost of the smoke detector 6.
Further, if many outer structure support portions such as the vertical outer structure support portion 61 a and the lateral outer structure support portion 61 b are provided on the side surface of the sensor cover 61, smoke flows into the smoke detection area in the sensor cover 61. There is also a problem that the smoke detection sensitivity of the smoke detector 6 cannot be maintained.
The present invention has been made in view of the above problems, and provides a smoke detector that can reduce the cost of manufacturing a sensor cover and a body cover and that does not obstruct the flow of smoke to the smoke detection area. With the goal.
上記目的を達成するために本発明は、複数のラビリンス壁を周設し、このラビリンス壁間から流入して来た煙による散乱光を受光することで煙を感知する煙センサ部と、少なくとも前記煙センサ部を内部に収容するセンサカバーと、このセンサカバーに連続して設けられるボディカバーとを備えた煙感知器において、前記センサカバーは、有底円筒状であり、該センサカバーの側面には複数の上下方向のみの外殻構造支持部及び開口部が交互に形成されていることを特徴とする。
この煙感知器において、前記センサカバー及び前記ボディカバーは一体として前記煙感知器の外郭を構成していることが好ましい。
この煙感知器において、隣り合う前記外郭構造支持部は、ユーザの手指が前記センサカバーの内部に収容された部品に触れることができないような間隔で形成されていることが好ましい。
この煙感知器において、前記複数の外郭構造支持部の一部が、前記煙センサ部に接し、他部が該煙センサ部に接しないように構成されていることが好ましい。
この煙感知器において、前記煙センサ部と接する前記外郭構造支持部と、前記煙センサ部と接しない前記外郭構造支持部とが交互に形成されていることが好ましい。In order to achieve the above object, the present invention provides a smoke sensor unit for detecting smoke by surrounding a plurality of labyrinth walls and receiving scattered light from smoke flowing in between the labyrinth walls, In a smoke detector including a sensor cover that houses a smoke sensor unit and a body cover that is provided continuously to the sensor cover, the sensor cover is a bottomed cylinder, and the side surface of the sensor cover A plurality of outer shell structure support portions and openings only in the vertical direction are alternately formed.
In this smoke detector, it is preferable that the sensor cover and the body cover integrally constitute an outline of the smoke detector.
In this smoke detector, it is preferable that the adjacent outer structure support portions are formed at intervals such that the user's fingers cannot touch the components housed in the sensor cover.
In this smoke detector, it is preferable that a part of the plurality of outer structure support portions is in contact with the smoke sensor portion and the other portion is not in contact with the smoke sensor portion.
In this smoke detector, it is preferable that the outer structure support portion in contact with the smoke sensor portion and the outer structure support portion not in contact with the smoke sensor portion are alternately formed.
この煙感知器において、前記センサカバー及び前記ボディカバーは一体として前記煙感知器の外郭を構成していることが好ましい。
この煙感知器において、隣り合う前記外郭構造支持部は、ユーザの手指が前記センサカバーの内部に収容された部品に触れることができないような間隔で形成されていることが好ましい。
この煙感知器において、前記複数の外郭構造支持部の一部が、前記煙センサ部に接し、他部が該煙センサ部に接しないように構成されていることが好ましい。
この煙感知器において、前記煙センサ部と接する前記外郭構造支持部と、前記煙センサ部と接しない前記外郭構造支持部とが交互に形成されていることが好ましい。In order to achieve the above object, the present invention provides a smoke sensor unit for detecting smoke by surrounding a plurality of labyrinth walls and receiving scattered light from smoke flowing in between the labyrinth walls, In a smoke detector including a sensor cover that houses a smoke sensor unit and a body cover that is provided continuously to the sensor cover, the sensor cover is a bottomed cylinder, and the side surface of the sensor cover A plurality of outer shell structure support portions and openings only in the vertical direction are alternately formed.
In this smoke detector, it is preferable that the sensor cover and the body cover integrally constitute an outline of the smoke detector.
In this smoke detector, it is preferable that the adjacent outer structure support portions are formed at intervals such that the user's fingers cannot touch the components housed in the sensor cover.
In this smoke detector, it is preferable that a part of the plurality of outer structure support portions is in contact with the smoke sensor portion and the other portion is not in contact with the smoke sensor portion.
In this smoke detector, it is preferable that the outer structure support portion in contact with the smoke sensor portion and the outer structure support portion not in contact with the smoke sensor portion are alternately formed.
本発明に係る煙感知器によれば、有底円筒状のセンサカバーの側面に複数の上下方向のみの外殻構造支持部及び開口部が交互に形成された構造であるため、センサカバーの金型を簡易化して製造時のコスト削減を図ることができる。また、センサカバーの側面の外郭構造支持部の一部が、煙センサ部に接し、他部が煙センサ部に接しないように構成されるので、外郭構造支持部が煙感知領域への煙の流れを妨害することを低減できる。
The smoke sensor according to the present invention has a structure in which a plurality of outer shell structure support portions and openings only in the vertical direction are alternately formed on the side surface of the bottomed cylindrical sensor cover. The mold can be simplified to reduce the manufacturing cost. In addition, since a part of the outer structure support part on the side surface of the sensor cover is configured to contact the smoke sensor part and the other part does not contact the smoke sensor part, the outer structure support part is configured to prevent smoke from entering the smoke detection area. Interfering with the flow can be reduced.
本発明の目的及び特徴は以下のような添付図面と好ましい実施例の説明により明確になる。
本発明の実施の形態に係る煙感知器の斜視図である。
同上煙感知器の分解斜視図である。
同上煙感知器の側面図である。
同上煙感知器の光学基台（煙センサ部）を示す図である。
（ａ）同上光学基台における流体解析による圧力分布図、（ｂ）従来の煙感知器の光学基台における流体解析による圧力分布図である。
（ａ）従来の煙感知器の分解斜視図、（ｂ）同上煙感知器の側面図である。
The objects and features of the present invention will become apparent from the following drawings and description of preferred embodiments.
It is a perspective view of the smoke detector which concerns on embodiment of this invention. It is a disassembled perspective view of a smoke detector same as the above. It is a side view of a smoke detector same as the above. It is a figure which shows the optical base (smoke sensor part) of a smoke sensor same as the above. (A) Pressure distribution figure by fluid analysis in optical base same as the above, (b) Pressure distribution chart by fluid analysis in optical base of conventional smoke detector. (A) It is a disassembled perspective view of the conventional smoke sensor, (b) It is a side view of a smoke sensor same as the above.
以下、本発明の実施形態を本明細書の一部を成す添付図面を参照してより詳細に説明する。図面全体において同一又は類似する部分については同一参照符号を付して説明を省略する。
（実施の形態）
本発明の実施の形態に係る煙感知器について図面を参照して説明する。図１に示すように、煙感知器１は、複数のラビリンス壁の空隙から感煙領域に流入してきた煙の散乱光を受光し、受光量を受光信号に変換して、この受光信号が閾値を超えたときに火災警報を行う装置である。煙感知器１の外郭は、ベース１０、センサカバー１１及びボディカバー１２で構成される。このベース１０は、略円盤状の樹脂等によって形成されており、例えば天井面２にネジ止めするため設置面側の２箇所にネジ孔が形成されている。
この煙感知器１の内部構造について図２を参照して説明する。煙感知器１は、センサカバー１１及びボディカバー１２の内部に、回路基板１３、光学基台（煙センサ部）１４、防虫カバー１５、及びスピーカ１６の複数の部品が収容されて構成される。
センサカバー１１は、内部に光学基台１４、防虫カバー１５、及びスピーカ１６を収容して、これらの部材を保護する保護カバーとしての役目を有している。また、センサカバー１１は、有底円筒状に形成され、その側面には複数の上下方向のみの外殻構造支持部１１ａ及び開口部１１ｂが交互に形成されている。外部からの煙は、この開口部１１ｂを経て防虫カバー１５の防虫網の開口を通って光学基台１４上の煙感知空間内に侵入するようになっている。
ボディカバー１２は、内部に回路基板１３を収容すると共に、ベース１０に近づけながら時計方向に回動させることでベース１０と結合される。また、本実施の形態ではセンサカバー１１及びボディカバー１２は一体として形成されている。センサカバー１１及びボディカバー１２は、芯材である金属部、及びこの金属部の周囲にコーティングされる絶縁樹脂で形成される。
回路基板１３は、発光ダイオードやフォトダイオードの光学素子や受光信号を監視して閾値を超えたときに火災発報信号を出力するマイコン等の回路部品を実装している。
光学基台１４は、回路基板１３上に設置され、略円板状の底板と、底板の周縁に形成された周壁とを備え、底板の上面には発光部及び受光部が設けられる。また、光学基台１４には、後述するように、周壁に沿うようにして複数のラビリンス壁が設けられており、この複数のラビリンス壁で囲まれた部分が煙感知空間となる。ラビリンス壁は、センサカバー１１の側面から侵入する煙を、煙感知空間の略中央部にある煙感知領域に誘導すると共に、煙感知領域に侵入する外光を遮断するために煙感知空間側の内方で、平面視で略「く」の字形状に屈曲される。なお、光学基台１４に形成される発光部及び受光部は、回路基板１３の上面に取り付けられた発光ダイオード及びフォトダイオードを収容するものである。
防虫カバー１５は、虫や埃などが煙感知領域内に入らないように防虫網を有した構造であり、その下端部が光学基台１４の周壁と嵌合するように構成されている。また、防虫カバー１５の上面にはスピーカ１６が嵌合される。スピーカ１６は、火災を検知したことを知らせる警報音などを鳴動する機能を有している。
次に、煙感知器１のセンサカバー１１の外郭構造について図３を参照して説明する。センサカバー１１は、有底円筒状であり、その側面には複数の上下方向のみの外殻構造支持部１１ａ及び開口部１１ｂが交互に形成されている。これは、センサカバー１１に上下方向及び横方向の外郭構造支持部を形成する場合、芯材となる金属成型用の金型が複雑になり、その結果、煙感知器１のコストアップ要因となる。従って、本実施の形態においては、センサカバー１１の側面に、複数の上下方向のみの外郭構造支持部１１ａを形成し、横方向の外郭構造支持部を形成しないことでセンサカバー１１の金型を簡易化し、製造時のコスト削減を図ることができる。
また、上記構造のセンサカバー１１にすることで、金型の構造を簡易化して、センサカバー１１及びボディカバー１２を一体化して製造することも可能となる。その結果、煙感知器１の製造時のコスト削減を図ることが可能となる。
次に、センサカバー１１の側面に形成される上下方向外郭構造支持部１１ａの配置及び形状について、図４を参照して説明する。センサカバー１１の内側には、複数のラビリンス壁１４ａを周設した煙感知空間１４ｂに発光部１４ｃを設け、これら複数のラビリンス壁１４ａの空隙から煙感知空間１４ｂに流入してきた煙の散乱光を受光部１４ｄで受光する光学基台１４が嵌合されている。
センサカバー１１の側面に形成された隣り合う上下方向外郭構造支持部１１ａは、ユーザの手指が前記センサカバーの内部に収容された部品に触れることができないような間隔で形成されている。本実施の形態においては、図４に示すように、隣り合う外郭構造支持部１１ａの半径方向線のなす位相差αが２２．５度となるように配置されている。
また、センサカバー１１は、側面に形成される複数の外郭構造支持部１１ａの一部が光学基台１４に接し、他の外郭構造支持部１１ａ´が光学基台１４に接しないように構成されている。図４では、光学基台１４と接する外郭構造支持部１１ａと、光学基台１４と接しない外郭構造支持部１１ａ´とが交互に形成されている場合を示している。これは、煙感知空間１４ｂへの煙の侵入を外郭構造支持部１１ａが妨害して、煙感知器１における煙検知能力が低下することを防止するためである。
上記について図５を参照して説明する。図５（ａ）は、本実施の形態に係るセンサカバー１１及び光学基台１４を用いた場合の煙感知空間周辺部の気圧分布を示す。一方、図５（ｂ）は、従来の外郭構造支持部２１ａの配置及び形状を有するセンサカバー２１及び光学基台２４を用いた場合の煙感知空間周辺部の圧力分布を示す。図中において各矢印Ｙ１~Ｙ３は、センサカバー１１，２１の側面からの空気の流れＹ１、光学基台１４内の煙の経路Ｙ２、光学基台２４内の煙の経路Ｙ３を示している。また、図中の灰白色の領域（高圧領域３ａ）は、他の領域（低圧領域３ｂ）と比較して、より気圧の高い領域となる。このような光学基台１４の煙検知空間周辺部の高圧領域３ａ及び低圧領域３ｂの境界は、主に煙の流れに対して鋭角な位置にある外郭構造支持部１１ａ，２１ａの配置や形状に基づいて決まるものである。
そして、図５（ａ）に示す外郭構造支持部１１ａ，１１ａ´を有するセンサカバー１１を用いる方が、図５（ｂ）に示す外郭構造支持部２１ａを有するセンサカバー２１を用いる場合より、煙流入領域３ｃの気圧差が小さくなっていることが分かる。従って、センサカバー１１を用いた図５（ａ）の方が、煙の流れる経路Ｙ２と低圧領域３ｂとが離れ、煙が煙感知空間まで至り、光学基台１４の煙検知領域（中心付近）を通過する前に煙が外部に流出しにくくなる。その結果、煙感知器１における煙検知能力の低下を防止できる。
一方、図５（ｂ）に示す場合には、煙の流れる経路Ｙ３と低圧領域３ｂが比較的近くなり、経路Ｙ３に示すように、煙検知領域（中心付近）を通過する前に煙が外部に流出してしまい、煙感知器１における煙検知能力が低下してしまう。このように、本実施の形態に係るセンサカバー１１を用いることで、煙感知空間への煙の侵入を外郭構造支持部１１ａ，１１ａ´が妨害することをできるだけ低減し、煙感知器１の煙検知能力の低下を防止できる。
なお、防虫カバー１５に備わる防虫網も、光学基台１４への流体の流入の抵抗になる。このため、光学基台１４の側面に到達した流れが防虫網で抵抗を受けて煙感知空間１４ｂへ流入しない場合がある。そして、煙の流入性確保のためにセンサカバー１１の外郭構造支持部を防虫網に接触しない外郭構造支持部１１ａ´のみで構成すると、構造強度、デザイン性の偏重が起こる。本実施の形態では、煙検知空間を有する光学基台１４と接する外郭構造支持部１１ａと接しない外郭構造支持部１１ａ´とを交互に設けることで構造強度、デザイン性を保持しながら煙の流入性を確保している。
以上のように、本実施の形態に係る煙感知器１のセンサカバー１１は、有底円筒状であり、その側面には複数の上下方向のみの外殻構造支持部１１ａ及び開口部１１ｂが交互に形成されている。このため、センサカバー１１の製造時の金型を簡易化して、センサカバー１１及びボディカバー１２を一体化できる。従って、製造時のコスト削減を実現できる。
また、センサカバー１１の隣り合う上下方向外郭構造支持部１１ａが所定間隔以下で形成されることで、ユーザの手指がセンサカバー１１の内部に収容された光学部品に触れることを防止できる。さらに、光学基台１４と接する外郭構造支持部１１ａと、光学基台１４と接しない外郭構造支持部１１ａ´とが交互に形成されているため、光学基台１４上の煙感知空間への煙の流れに効率的に誘導し、煙感知器１の構造強度とデザイン性の確保をも実現できる。なお、本発明は、上記実施の形態の構成に限られず、発明の趣旨を変更しない範囲で種々の変形が可能である。
以上、本発明の好ましい実施形態が説明されているが、本発明はこれらの特定の実施形態に限られるものではなく、請求範囲の範疇から離脱しない多様な変更及び変形が可能であり、それも本発明の範疇内に属する。 Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings, which form a part of this specification. The same or similar parts throughout the drawings are denoted by the same reference numerals, and the description thereof is omitted.
(Embodiment)
A smoke detector according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the smoke detector 1 receives scattered light of smoke that has flowed into the smoke-sensitive area from the gaps of a plurality of labyrinth walls, converts the amount of received light into a received light signal, and the received light signal is a threshold value. It is a device that gives a fire alarm when it exceeds. The outer shell of the smoke detector 1 includes a base 10, a sensor cover 11, and a body cover 12. The base 10 is formed of a substantially disk-shaped resin or the like. For example, screw holes are formed in two places on the installation surface side for screwing to the ceiling surface 2.
The internal structure of the smoke detector 1 will be described with reference to FIG. The smoke detector 1 includes a sensor cover 11 and a body cover 12 in which a plurality of components such as a circuit board 13, an optical base (smoke sensor unit) 14, an insect-proof cover 15, and a speaker 16 are accommodated.
The sensor cover 11 accommodates the optical base 14, the insect-proof cover 15, and the speaker 16 inside, and has a role as a protective cover for protecting these members. The sensor cover 11 is formed in a bottomed cylindrical shape, and a plurality of outer shell structure support portions 11a and openings 11b are formed alternately on the side surface. Smoke from the outside enters the smoke sensing space on the optical base 14 through the opening 11b, through the opening of the insect screen of the insect protection cover 15, and so on.
The body cover 12 accommodates the circuit board 13 therein and is coupled to the base 10 by rotating clockwise while approaching the base 10. In the present embodiment, the sensor cover 11 and the body cover 12 are integrally formed. The sensor cover 11 and the body cover 12 are formed of a metal part as a core material and an insulating resin coated around the metal part.
The circuit board 13 is mounted with circuit components such as a microcomputer that monitors the optical elements of the light emitting diodes and photodiodes and the light reception signal and outputs a fire alarm signal when the threshold value is exceeded.
The optical base 14 is installed on the circuit board 13 and includes a substantially disk-shaped bottom plate and a peripheral wall formed on the periphery of the bottom plate, and a light emitting unit and a light receiving unit are provided on the top surface of the bottom plate. As will be described later, the optical base 14 is provided with a plurality of labyrinth walls along the peripheral wall, and a portion surrounded by the plurality of labyrinth walls serves as a smoke sensing space. The labyrinth wall guides smoke entering from the side surface of the sensor cover 11 to a smoke sensing area at a substantially central portion of the smoke sensing space, and blocks the outside light entering the smoke sensing area. Inwardly, it is bent into a substantially “<” shape in plan view. The light emitting part and the light receiving part formed on the optical base 14 accommodate light emitting diodes and photodiodes attached to the upper surface of the circuit board 13.
The insect repellent cover 15 has a structure having an insect repellent net so that insects, dust, and the like do not enter the smoke sensing region, and is configured so that the lower end thereof is fitted to the peripheral wall of the optical base 14. A speaker 16 is fitted on the top surface of the insect-proof cover 15. The speaker 16 has a function of sounding an alarm sound for notifying that a fire has been detected.
Next, the outer structure of the sensor cover 11 of the smoke detector 1 will be described with reference to FIG. The sensor cover 11 has a bottomed cylindrical shape, and a plurality of outer shell structure support portions 11 a and openings 11 b only in the vertical direction are alternately formed on the side surface. This is because when the vertical and horizontal outer structure support portions are formed on the sensor cover 11, the metal molding die as a core material becomes complicated, and as a result, the cost of the smoke detector 1 increases. . Therefore, in the present embodiment, a plurality of outer structure support portions 11a only in the vertical direction are formed on the side surface of the sensor cover 11, and the outer cover structure support portions in the horizontal direction are not formed, so that the mold of the sensor cover 11 is formed. This simplifies the manufacturing process and reduces the manufacturing cost.
In addition, by using the sensor cover 11 having the above structure, the structure of the mold can be simplified, and the sensor cover 11 and the body cover 12 can be integrally manufactured. As a result, it is possible to reduce the cost when manufacturing the smoke detector 1.
Next, the arrangement and shape of the vertical outline structure support portion 11a formed on the side surface of the sensor cover 11 will be described with reference to FIG. Inside the sensor cover 11, a light emitting portion 14c is provided in a smoke sensing space 14b in which a plurality of labyrinth walls 14a are provided. An optical base 14 that receives light by the light receiving portion 14d is fitted.
Adjacent vertical outer structure support portions 11a formed on the side surface of the sensor cover 11 are formed at intervals such that the user's fingers cannot touch the components housed inside the sensor cover. In the present embodiment, as shown in FIG. 4, the phase difference α formed by the radial lines of adjacent outer structure support portions 11 a is 22.5 degrees.
The sensor cover 11 is configured such that a part of the plurality of outer structure support portions 11 a formed on the side surface is in contact with the optical base 14 and the other outer structure support portions 11 a ′ are not in contact with the optical base 14. ing. FIG. 4 shows a case where the outer structure support portion 11a that contacts the optical base 14 and the outer structure support portion 11a ′ that does not contact the optical base 14 are alternately formed. This is for preventing the smoke detection capability of the smoke detector 1 from deteriorating due to the outer structure support portion 11a obstructing the intrusion of smoke into the smoke sensing space 14b.
The above will be described with reference to FIG. FIG. 5A shows the atmospheric pressure distribution around the smoke sensing space when the sensor cover 11 and the optical base 14 according to the present embodiment are used. On the other hand, FIG. 5B shows the pressure distribution around the smoke sensing space when using the sensor cover 21 and the optical base 24 having the arrangement and shape of the conventional outer structure support portion 21a. In the figure, arrows Y1 to Y3 indicate the air flow Y1 from the side surfaces of the sensor covers 11, 21, the smoke path Y2 in the optical base 14, and the smoke path Y3 in the optical base 24. Moreover, the grayish white area | region (high pressure area | region 3a) in a figure turns into an area | region where atmospheric pressure is higher compared with another area | region (low pressure area | region 3b). The boundary between the high pressure region 3a and the low pressure region 3b in the periphery of the smoke detection space of the optical base 14 is mainly in the arrangement and shape of the outer structure support portions 11a and 21a located at acute angles with respect to the smoke flow. It is determined based on this.
The sensor cover 11 having the outer structure support portions 11a and 11a ′ shown in FIG. 5 (a) is more effective than the sensor cover 21 having the outer structure support portion 21a shown in FIG. 5 (b). It can be seen that the pressure difference in the inflow region 3c is small. Therefore, in the case of FIG. 5A using the sensor cover 11, the smoke flow path Y <b> 2 and the low pressure region 3 b are separated, the smoke reaches the smoke detection space, and the smoke detection region (near the center) of the optical base 14. Smoke is less likely to flow out before passing through. As a result, it is possible to prevent the smoke detection capability of the smoke detector 1 from being lowered.
On the other hand, in the case shown in FIG. 5B, the path Y3 through which the smoke flows and the low pressure area 3b are relatively close to each other, and as shown in the path Y3, the smoke is exposed to the outside before passing through the smoke detection area (near the center). The smoke detection capability of the smoke detector 1 is reduced. Thus, by using the sensor cover 11 according to the present embodiment, it is possible to reduce as much as possible that the outer structure support portions 11a and 11a 'block the intrusion of smoke into the smoke sensing space, and the smoke of the smoke detector 1 can be reduced. Decrease in detection capability can be prevented.
Note that the insect screen provided in the insect cover 15 also resists the inflow of fluid into the optical base 14. For this reason, the flow that has reached the side surface of the optical base 14 may be resisted by the insect screen and may not flow into the smoke sensing space 14b. If the outer structure support portion of the sensor cover 11 is configured only by the outer structure support portion 11a ′ that does not contact the insect screen in order to ensure the inflow of smoke, the structural strength and the design property are deviated. In the present embodiment, the inflow of smoke while maintaining the structural strength and the design by alternately providing the outer structure support portion 11a 'that does not contact the outer structure support portion 11a that contacts the optical base 14 having the smoke detection space. The sex is secured.
As described above, the sensor cover 11 of the smoke detector 1 according to the present embodiment has a bottomed cylindrical shape, and a plurality of outer shell structure support portions 11a and openings 11b only in the vertical direction are alternately arranged on the side surface. Is formed. For this reason, the mold at the time of manufacture of the sensor cover 11 can be simplified, and the sensor cover 11 and the body cover 12 can be integrated. Therefore, cost reduction during manufacturing can be realized.
In addition, the adjacent vertical structure support portions 11 a of the sensor cover 11 are formed at a predetermined interval or less, so that the user's fingers can be prevented from touching the optical components housed in the sensor cover 11. Further, since the outer structure support portion 11a in contact with the optical base 14 and the outer structure support portion 11a ′ not in contact with the optical base 14 are alternately formed, smoke to the smoke sensing space on the optical base 14 is formed. It is possible to efficiently guide the flow of the smoke and secure the structural strength and design of the smoke detector 1. The present invention is not limited to the configuration of the above embodiment, and various modifications can be made without departing from the spirit of the invention.
The preferred embodiments of the present invention have been described above, but the present invention is not limited to these specific embodiments, and various modifications and variations that do not depart from the scope of the claims are possible. It belongs to the category of the present invention.
（実施の形態）
本発明の実施の形態に係る煙感知器について図面を参照して説明する。図１に示すように、煙感知器１は、複数のラビリンス壁の空隙から感煙領域に流入してきた煙の散乱光を受光し、受光量を受光信号に変換して、この受光信号が閾値を超えたときに火災警報を行う装置である。煙感知器１の外郭は、ベース１０、センサカバー１１及びボディカバー１２で構成される。このベース１０は、略円盤状の樹脂等によって形成されており、例えば天井面２にネジ止めするため設置面側の２箇所にネジ孔が形成されている。
この煙感知器１の内部構造について図２を参照して説明する。煙感知器１は、センサカバー１１及びボディカバー１２の内部に、回路基板１３、光学基台（煙センサ部）１４、防虫カバー１５、及びスピーカ１６の複数の部品が収容されて構成される。
センサカバー１１は、内部に光学基台１４、防虫カバー１５、及びスピーカ１６を収容して、これらの部材を保護する保護カバーとしての役目を有している。また、センサカバー１１は、有底円筒状に形成され、その側面には複数の上下方向のみの外殻構造支持部１１ａ及び開口部１１ｂが交互に形成されている。外部からの煙は、この開口部１１ｂを経て防虫カバー１５の防虫網の開口を通って光学基台１４上の煙感知空間内に侵入するようになっている。
ボディカバー１２は、内部に回路基板１３を収容すると共に、ベース１０に近づけながら時計方向に回動させることでベース１０と結合される。また、本実施の形態ではセンサカバー１１及びボディカバー１２は一体として形成されている。センサカバー１１及びボディカバー１２は、芯材である金属部、及びこの金属部の周囲にコーティングされる絶縁樹脂で形成される。
回路基板１３は、発光ダイオードやフォトダイオードの光学素子や受光信号を監視して閾値を超えたときに火災発報信号を出力するマイコン等の回路部品を実装している。
光学基台１４は、回路基板１３上に設置され、略円板状の底板と、底板の周縁に形成された周壁とを備え、底板の上面には発光部及び受光部が設けられる。また、光学基台１４には、後述するように、周壁に沿うようにして複数のラビリンス壁が設けられており、この複数のラビリンス壁で囲まれた部分が煙感知空間となる。ラビリンス壁は、センサカバー１１の側面から侵入する煙を、煙感知空間の略中央部にある煙感知領域に誘導すると共に、煙感知領域に侵入する外光を遮断するために煙感知空間側の内方で、平面視で略「く」の字形状に屈曲される。なお、光学基台１４に形成される発光部及び受光部は、回路基板１３の上面に取り付けられた発光ダイオード及びフォトダイオードを収容するものである。
防虫カバー１５は、虫や埃などが煙感知領域内に入らないように防虫網を有した構造であり、その下端部が光学基台１４の周壁と嵌合するように構成されている。また、防虫カバー１５の上面にはスピーカ１６が嵌合される。スピーカ１６は、火災を検知したことを知らせる警報音などを鳴動する機能を有している。
次に、煙感知器１のセンサカバー１１の外郭構造について図３を参照して説明する。センサカバー１１は、有底円筒状であり、その側面には複数の上下方向のみの外殻構造支持部１１ａ及び開口部１１ｂが交互に形成されている。これは、センサカバー１１に上下方向及び横方向の外郭構造支持部を形成する場合、芯材となる金属成型用の金型が複雑になり、その結果、煙感知器１のコストアップ要因となる。従って、本実施の形態においては、センサカバー１１の側面に、複数の上下方向のみの外郭構造支持部１１ａを形成し、横方向の外郭構造支持部を形成しないことでセンサカバー１１の金型を簡易化し、製造時のコスト削減を図ることができる。
また、上記構造のセンサカバー１１にすることで、金型の構造を簡易化して、センサカバー１１及びボディカバー１２を一体化して製造することも可能となる。その結果、煙感知器１の製造時のコスト削減を図ることが可能となる。
次に、センサカバー１１の側面に形成される上下方向外郭構造支持部１１ａの配置及び形状について、図４を参照して説明する。センサカバー１１の内側には、複数のラビリンス壁１４ａを周設した煙感知空間１４ｂに発光部１４ｃを設け、これら複数のラビリンス壁１４ａの空隙から煙感知空間１４ｂに流入してきた煙の散乱光を受光部１４ｄで受光する光学基台１４が嵌合されている。
センサカバー１１の側面に形成された隣り合う上下方向外郭構造支持部１１ａは、ユーザの手指が前記センサカバーの内部に収容された部品に触れることができないような間隔で形成されている。本実施の形態においては、図４に示すように、隣り合う外郭構造支持部１１ａの半径方向線のなす位相差αが２２．５度となるように配置されている。
また、センサカバー１１は、側面に形成される複数の外郭構造支持部１１ａの一部が光学基台１４に接し、他の外郭構造支持部１１ａ´が光学基台１４に接しないように構成されている。図４では、光学基台１４と接する外郭構造支持部１１ａと、光学基台１４と接しない外郭構造支持部１１ａ´とが交互に形成されている場合を示している。これは、煙感知空間１４ｂへの煙の侵入を外郭構造支持部１１ａが妨害して、煙感知器１における煙検知能力が低下することを防止するためである。
上記について図５を参照して説明する。図５（ａ）は、本実施の形態に係るセンサカバー１１及び光学基台１４を用いた場合の煙感知空間周辺部の気圧分布を示す。一方、図５（ｂ）は、従来の外郭構造支持部２１ａの配置及び形状を有するセンサカバー２１及び光学基台２４を用いた場合の煙感知空間周辺部の圧力分布を示す。図中において各矢印Ｙ１~Ｙ３は、センサカバー１１，２１の側面からの空気の流れＹ１、光学基台１４内の煙の経路Ｙ２、光学基台２４内の煙の経路Ｙ３を示している。また、図中の灰白色の領域（高圧領域３ａ）は、他の領域（低圧領域３ｂ）と比較して、より気圧の高い領域となる。このような光学基台１４の煙検知空間周辺部の高圧領域３ａ及び低圧領域３ｂの境界は、主に煙の流れに対して鋭角な位置にある外郭構造支持部１１ａ，２１ａの配置や形状に基づいて決まるものである。
そして、図５（ａ）に示す外郭構造支持部１１ａ，１１ａ´を有するセンサカバー１１を用いる方が、図５（ｂ）に示す外郭構造支持部２１ａを有するセンサカバー２１を用いる場合より、煙流入領域３ｃの気圧差が小さくなっていることが分かる。従って、センサカバー１１を用いた図５（ａ）の方が、煙の流れる経路Ｙ２と低圧領域３ｂとが離れ、煙が煙感知空間まで至り、光学基台１４の煙検知領域（中心付近）を通過する前に煙が外部に流出しにくくなる。その結果、煙感知器１における煙検知能力の低下を防止できる。
一方、図５（ｂ）に示す場合には、煙の流れる経路Ｙ３と低圧領域３ｂが比較的近くなり、経路Ｙ３に示すように、煙検知領域（中心付近）を通過する前に煙が外部に流出してしまい、煙感知器１における煙検知能力が低下してしまう。このように、本実施の形態に係るセンサカバー１１を用いることで、煙感知空間への煙の侵入を外郭構造支持部１１ａ，１１ａ´が妨害することをできるだけ低減し、煙感知器１の煙検知能力の低下を防止できる。
なお、防虫カバー１５に備わる防虫網も、光学基台１４への流体の流入の抵抗になる。このため、光学基台１４の側面に到達した流れが防虫網で抵抗を受けて煙感知空間１４ｂへ流入しない場合がある。そして、煙の流入性確保のためにセンサカバー１１の外郭構造支持部を防虫網に接触しない外郭構造支持部１１ａ´のみで構成すると、構造強度、デザイン性の偏重が起こる。本実施の形態では、煙検知空間を有する光学基台１４と接する外郭構造支持部１１ａと接しない外郭構造支持部１１ａ´とを交互に設けることで構造強度、デザイン性を保持しながら煙の流入性を確保している。
以上のように、本実施の形態に係る煙感知器１のセンサカバー１１は、有底円筒状であり、その側面には複数の上下方向のみの外殻構造支持部１１ａ及び開口部１１ｂが交互に形成されている。このため、センサカバー１１の製造時の金型を簡易化して、センサカバー１１及びボディカバー１２を一体化できる。従って、製造時のコスト削減を実現できる。
また、センサカバー１１の隣り合う上下方向外郭構造支持部１１ａが所定間隔以下で形成されることで、ユーザの手指がセンサカバー１１の内部に収容された光学部品に触れることを防止できる。さらに、光学基台１４と接する外郭構造支持部１１ａと、光学基台１４と接しない外郭構造支持部１１ａ´とが交互に形成されているため、光学基台１４上の煙感知空間への煙の流れに効率的に誘導し、煙感知器１の構造強度とデザイン性の確保をも実現できる。なお、本発明は、上記実施の形態の構成に限られず、発明の趣旨を変更しない範囲で種々の変形が可能である。
以上、本発明の好ましい実施形態が説明されているが、本発明はこれらの特定の実施形態に限られるものではなく、請求範囲の範疇から離脱しない多様な変更及び変形が可能であり、それも本発明の範疇内に属する。 Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings, which form a part of this specification. The same or similar parts throughout the drawings are denoted by the same reference numerals, and the description thereof is omitted.
(Embodiment)
A smoke detector according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the smoke detector 1 receives scattered light of smoke that has flowed into the smoke-sensitive area from the gaps of a plurality of labyrinth walls, converts the amount of received light into a received light signal, and the received light signal is a threshold value. It is a device that gives a fire alarm when it exceeds. The outer shell of the smoke detector 1 includes a base 10, a sensor cover 11, and a body cover 12. The base 10 is formed of a substantially disk-shaped resin or the like. For example, screw holes are formed in two places on the installation surface side for screwing to the ceiling surface 2.
The internal structure of the smoke detector 1 will be described with reference to FIG. The smoke detector 1 includes a sensor cover 11 and a body cover 12 in which a plurality of components such as a circuit board 13, an optical base (smoke sensor unit) 14, an insect-proof cover 15, and a speaker 16 are accommodated.
The sensor cover 11 accommodates the optical base 14, the insect-proof cover 15, and the speaker 16 inside, and has a role as a protective cover for protecting these members. The sensor cover 11 is formed in a bottomed cylindrical shape, and a plurality of outer shell structure support portions 11a and openings 11b are formed alternately on the side surface. Smoke from the outside enters the smoke sensing space on the optical base 14 through the opening 11b, through the opening of the insect screen of the insect protection cover 15, and so on.
The body cover 12 accommodates the circuit board 13 therein and is coupled to the base 10 by rotating clockwise while approaching the base 10. In the present embodiment, the sensor cover 11 and the body cover 12 are integrally formed. The sensor cover 11 and the body cover 12 are formed of a metal part as a core material and an insulating resin coated around the metal part.
The circuit board 13 is mounted with circuit components such as a microcomputer that monitors the optical elements of the light emitting diodes and photodiodes and the light reception signal and outputs a fire alarm signal when the threshold value is exceeded.
The optical base 14 is installed on the circuit board 13 and includes a substantially disk-shaped bottom plate and a peripheral wall formed on the periphery of the bottom plate, and a light emitting unit and a light receiving unit are provided on the top surface of the bottom plate. As will be described later, the optical base 14 is provided with a plurality of labyrinth walls along the peripheral wall, and a portion surrounded by the plurality of labyrinth walls serves as a smoke sensing space. The labyrinth wall guides smoke entering from the side surface of the sensor cover 11 to a smoke sensing area at a substantially central portion of the smoke sensing space, and blocks the outside light entering the smoke sensing area. Inwardly, it is bent into a substantially “<” shape in plan view. The light emitting part and the light receiving part formed on the optical base 14 accommodate light emitting diodes and photodiodes attached to the upper surface of the circuit board 13.
The insect repellent cover 15 has a structure having an insect repellent net so that insects, dust, and the like do not enter the smoke sensing region, and is configured so that the lower end thereof is fitted to the peripheral wall of the optical base 14. A speaker 16 is fitted on the top surface of the insect-proof cover 15. The speaker 16 has a function of sounding an alarm sound for notifying that a fire has been detected.
Next, the outer structure of the sensor cover 11 of the smoke detector 1 will be described with reference to FIG. The sensor cover 11 has a bottomed cylindrical shape, and a plurality of outer shell structure support portions 11 a and openings 11 b only in the vertical direction are alternately formed on the side surface. This is because when the vertical and horizontal outer structure support portions are formed on the sensor cover 11, the metal molding die as a core material becomes complicated, and as a result, the cost of the smoke detector 1 increases. . Therefore, in the present embodiment, a plurality of outer structure support portions 11a only in the vertical direction are formed on the side surface of the sensor cover 11, and the outer cover structure support portions in the horizontal direction are not formed, so that the mold of the sensor cover 11 is formed. This simplifies the manufacturing process and reduces the manufacturing cost.
In addition, by using the sensor cover 11 having the above structure, the structure of the mold can be simplified, and the sensor cover 11 and the body cover 12 can be integrally manufactured. As a result, it is possible to reduce the cost when manufacturing the smoke detector 1.
Next, the arrangement and shape of the vertical outline structure support portion 11a formed on the side surface of the sensor cover 11 will be described with reference to FIG. Inside the sensor cover 11, a light emitting portion 14c is provided in a smoke sensing space 14b in which a plurality of labyrinth walls 14a are provided. An optical base 14 that receives light by the light receiving portion 14d is fitted.
Adjacent vertical outer structure support portions 11a formed on the side surface of the sensor cover 11 are formed at intervals such that the user's fingers cannot touch the components housed inside the sensor cover. In the present embodiment, as shown in FIG. 4, the phase difference α formed by the radial lines of adjacent outer structure support portions 11 a is 22.5 degrees.
The sensor cover 11 is configured such that a part of the plurality of outer structure support portions 11 a formed on the side surface is in contact with the optical base 14 and the other outer structure support portions 11 a ′ are not in contact with the optical base 14. ing. FIG. 4 shows a case where the outer structure support portion 11a that contacts the optical base 14 and the outer structure support portion 11a ′ that does not contact the optical base 14 are alternately formed. This is for preventing the smoke detection capability of the smoke detector 1 from deteriorating due to the outer structure support portion 11a obstructing the intrusion of smoke into the smoke sensing space 14b.
The above will be described with reference to FIG. FIG. 5A shows the atmospheric pressure distribution around the smoke sensing space when the sensor cover 11 and the optical base 14 according to the present embodiment are used. On the other hand, FIG. 5B shows the pressure distribution around the smoke sensing space when using the sensor cover 21 and the optical base 24 having the arrangement and shape of the conventional outer structure support portion 21a. In the figure, arrows Y1 to Y3 indicate the air flow Y1 from the side surfaces of the sensor covers 11, 21, the smoke path Y2 in the optical base 14, and the smoke path Y3 in the optical base 24. Moreover, the grayish white area | region (high pressure area | region 3a) in a figure turns into an area | region where atmospheric pressure is higher compared with another area | region (low pressure area | region 3b). The boundary between the high pressure region 3a and the low pressure region 3b in the periphery of the smoke detection space of the optical base 14 is mainly in the arrangement and shape of the outer structure support portions 11a and 21a located at acute angles with respect to the smoke flow. It is determined based on this.
The sensor cover 11 having the outer structure support portions 11a and 11a ′ shown in FIG. 5 (a) is more effective than the sensor cover 21 having the outer structure support portion 21a shown in FIG. 5 (b). It can be seen that the pressure difference in the inflow region 3c is small. Therefore, in the case of FIG. 5A using the sensor cover 11, the smoke flow path Y <b> 2 and the low pressure region 3 b are separated, the smoke reaches the smoke detection space, and the smoke detection region (near the center) of the optical base 14. Smoke is less likely to flow out before passing through. As a result, it is possible to prevent the smoke detection capability of the smoke detector 1 from being lowered.
On the other hand, in the case shown in FIG. 5B, the path Y3 through which the smoke flows and the low pressure area 3b are relatively close to each other, and as shown in the path Y3, the smoke is exposed to the outside before passing through the smoke detection area (near the center). The smoke detection capability of the smoke detector 1 is reduced. Thus, by using the sensor cover 11 according to the present embodiment, it is possible to reduce as much as possible that the outer structure support portions 11a and 11a 'block the intrusion of smoke into the smoke sensing space, and the smoke of the smoke detector 1 can be reduced. Decrease in detection capability can be prevented.
Note that the insect screen provided in the insect cover 15 also resists the inflow of fluid into the optical base 14. For this reason, the flow that has reached the side surface of the optical base 14 may be resisted by the insect screen and may not flow into the smoke sensing space 14b. If the outer structure support portion of the sensor cover 11 is configured only by the outer structure support portion 11a ′ that does not contact the insect screen in order to ensure the inflow of smoke, the structural strength and the design property are deviated. In the present embodiment, the inflow of smoke while maintaining the structural strength and the design by alternately providing the outer structure support portion 11a 'that does not contact the outer structure support portion 11a that contacts the optical base 14 having the smoke detection space. The sex is secured.
As described above, the sensor cover 11 of the smoke detector 1 according to the present embodiment has a bottomed cylindrical shape, and a plurality of outer shell structure support portions 11a and openings 11b only in the vertical direction are alternately arranged on the side surface. Is formed. For this reason, the mold at the time of manufacture of the sensor cover 11 can be simplified, and the sensor cover 11 and the body cover 12 can be integrated. Therefore, cost reduction during manufacturing can be realized.
In addition, the adjacent vertical structure support portions 11 a of the sensor cover 11 are formed at a predetermined interval or less, so that the user's fingers can be prevented from touching the optical components housed in the sensor cover 11. Further, since the outer structure support portion 11a in contact with the optical base 14 and the outer structure support portion 11a ′ not in contact with the optical base 14 are alternately formed, smoke to the smoke sensing space on the optical base 14 is formed. It is possible to efficiently guide the flow of the smoke and secure the structural strength and design of the smoke detector 1. The present invention is not limited to the configuration of the above embodiment, and various modifications can be made without departing from the spirit of the invention.
The preferred embodiments of the present invention have been described above, but the present invention is not limited to these specific embodiments, and various modifications and variations that do not depart from the scope of the claims are possible. It belongs to the category of the present invention.
Claims (5)
- 複数のラビリンス壁を周設し、このラビリンス壁間から流入して来た煙による散乱光を受光することで煙を感知する煙センサ部と、少なくとも前記煙センサ部を内部に収容するセンサカバーと、このセンサカバーに連続して設けられるボディカバーとを備えた煙感知器において、
前記センサカバーは、有底円筒状であり、該センサカバーの側面には複数の上下方向のみの外殻構造支持部及び開口部が交互に形成されていることを特徴とする煙感知器。 A plurality of labyrinth walls, and a smoke sensor unit that senses smoke by receiving scattered light from smoke flowing in between the labyrinth walls; and a sensor cover that houses at least the smoke sensor unit therein In the smoke detector provided with a body cover provided continuously to the sensor cover,
The smoke sensor according to claim 1, wherein the sensor cover has a bottomed cylindrical shape, and a plurality of outer shell structure support portions and openings only in the vertical direction are alternately formed on a side surface of the sensor cover. - 前記センサカバー及び前記ボディカバーは一体として前記煙感知器の外郭を構成していることを特徴とする請求項１記載の煙感知器。 The smoke sensor according to claim 1, wherein the sensor cover and the body cover integrally form an outer shell of the smoke sensor.
- 隣り合う前記外郭構造支持部は、ユーザの手指が前記センサカバーの内部に収容された部品に触れることができないような間隔で形成されていることを特徴とする請求項１又は請求項２記載の煙感知器。 The adjacent outer structure support portions are formed at an interval such that a user's finger cannot touch a component housed in the sensor cover. smoke detector.
- 前記複数の外郭構造支持部の一部が、前記煙センサ部に接し、他部が該煙センサ部に接しないように構成されていることを特徴とする請求項１乃至請求項３のいずれか一項に記載の煙感知器。 4. The structure according to claim 1, wherein a part of the plurality of outer structure support parts is configured to be in contact with the smoke sensor part and the other part is not in contact with the smoke sensor part. The smoke detector according to one item.
- 前記煙センサ部と接する前記外郭構造支持部と、前記煙センサ部と接しない前記外郭構造支持部とが交互に形成されていることを特徴とする請求項１乃至請求項４のいずれか一項に記載の煙感知器。 5. The outer structure support portion that contacts the smoke sensor portion and the outer structure support portion that does not contact the smoke sensor portion are alternately formed. 6. Smoke detector as described in
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| JP2011053907A JP6004304B2 (en) | 2011-03-11 | 2011-03-11 | smoke detector |
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| US10809173B2 (en) | 2017-12-15 | 2020-10-20 | Analog Devices, Inc. | Smoke detector chamber boundary surfaces |
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- 2012-03-09 TW TW101107993A patent/TWI459328B/en not_active IP Right Cessation
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| JPS6030090U (en) * | 1983-07-31 | 1985-02-28 | 松下電工株式会社 | photoelectric smoke detector |
| JPS63208997A (en) * | 1987-02-26 | 1988-08-30 | ホーチキ株式会社 | Photoelectric type smoke sensor |
| JP2005174000A (en) * | 2003-12-11 | 2005-06-30 | Tokyo Gas Co Ltd | Fire alarm |
| JP2007286795A (en) * | 2006-04-14 | 2007-11-01 | Hochiki Corp | Alarm |
| JP2012014330A (en) * | 2010-06-30 | 2012-01-19 | Lixil Nittan Co Ltd | Heat-smoke composite type sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2012190304A (en) | 2012-10-04 |
| TWI459328B (en) | 2014-11-01 |
| JP6004304B2 (en) | 2016-10-05 |
| TW201237811A (en) | 2012-09-16 |
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