JP5097597B2 - Fire alarm - Google Patents

Description

  The present invention relates to a fire alarm in which a smoke detection unit is provided so as to protrude from the front surface of a housing.

2. Description of the Related Art Conventionally, a fire alarm is known in which a smoke detector is provided so as to protrude from the front surface of a housing. The smoke detector has a smoke detection space inside, and the light receiving element receives the scattered light from the light emitting element due to the smoke flowing into the smoke detection space from the smoke inlet provided around the smoke detection space. If it becomes the value which shows more than predetermined smoke density | concentration, it is comprised so that a fire alarm may be performed (for example, refer patent document 1).
JP 2007-286895 A

  The above fire alarms are used by being installed on the installation surface such as the ceiling surface or wall surface. However, the smoke detector is provided so as to protrude from the front surface of the housing, so it is especially attached to the wall surface for a long time. As a result, dust or the like is accumulated on the upper part of the smoke inlet, and there is a problem that the inflow property of the smoke into the smoke detection unit is reduced by the dust. In addition, in order to prevent this, it is desired to prompt the user to periodically clean the smoke detector according to the installation situation.

  The present invention has been made in view of the above-mentioned problems, and its purpose is to prevent a fire inflow from being deteriorated even when attached to a wall surface, and to enable accurate smoke detection over a long period of time. Is to provide a vessel. Another object is to have the user periodically clean the smoke detector according to the installation situation.

In the fire alarm provided with the smoke detection unit protruding from the front surface of the housing, the present invention prevents dust from accumulating at the smoke inlet of the smoke detection unit when protruding outside the housing. And an installation surface setting switch for setting a ceiling surface or a wall surface as an installation surface of the fire alarm, and a cleaning notification alarm means for performing a cleaning notification alarm of the smoke detection unit. Control means for variably setting a notification specification of the cleaning notification alarm of the cleaning notification alarm means based on a setting state of the installation surface setting switch, and the flange portion is provided in the casing. The contact is pressed by the flange when housed inside, and the ceiling surface is set as the installation surface, while the contact is released when the flange protrudes outside the housing. , As the installation surface And characterized in that the surface is set.

In addition, when the installation surface is a wall surface setting, the control means shortens the notification interval of the cleaning notification alarm than when the ceiling surface is set, or when the installation surface is a wall surface setting. While the cleaning notification alarm is performed, the cleaning notification alarm is not performed when the ceiling surface is set .

  The present invention provides a fire alarm provided with a smoke detector protruding from the front surface of the casing, and prevents dust from accumulating at the smoke inlet of the smoke detector when protruding outside the casing. Since the unit is housed in the casing so as to be able to move forward and backward, when attaching the fire alarm to the wall surface, by projecting the hook part to the outside of the casing, dust is introduced into the smoke inlet of the smoke detector. Therefore, even if it is attached to the wall surface, it is possible to prevent smoke from flowing down and accurately detect smoke over a long period of time. Also, when installing the fire alarm on the ceiling surface, it is difficult for dust to accumulate at the smoke inlet of the smoke detector, and it is not necessary to protrude the butt out of the housing. Since the part can be kept in the state of being housed inside the housing, the fire alarm can be used for wall surface installation and ceiling installation.

  Further, since the urging member that urges the flange portion toward the outside of the housing and the stopper member that restricts the protrusion of the flange portion to the outside of the housing are provided, the restriction of the stopper member is released. By doing so, the collar portion is urged by the urging member and can easily protrude outside the housing.

  Further, an installation surface setting switch for setting a ceiling surface or a wall surface as an installation surface of the fire alarm, a cleaning notification alarm means for performing a cleaning notification alarm for the smoke detector, and a setting state of the installation surface setting switch Control means for variably setting a notification specification of the cleaning notification alarm of the cleaning notification means, and the installation surface installation switch has a contact point by the flange when the flange is housed in the housing. When pressed, a ceiling surface is set as the installation surface. On the other hand, when the flange protrudes outside the housing, the contact is released and the wall surface is set as the installation surface. Therefore, when attaching the fire alarm to the ceiling surface, the contact point of the installation surface setting switch is pressed by keeping the buttocks housed inside the housing, so that the control means is installed on the installation surface setting switch. Able to determine that the setting state of a ceiling surface installation, based thereon, it is possible to set the notification specification cleaning notification alarm cleaning alarm notification means. On the other hand, when attaching the fire alarm to the wall surface, the pressing of the contact of the installation surface setting switch is released by protruding the collar part outside the housing, so the control means is in the setting state of the installation surface setting switch. It can be determined that the wall is installed, and based on that, the notification specification of the cleaning notification alarm of the cleaning alarm report notification means can be set, and the cleaning notification alarm of the smoke detection unit can be performed.

  In addition, when the installation surface is a wall surface setting, the control means shortens the alarm interval of the cleaning notification alarm than when the ceiling surface is set, or when the installation surface is a wall surface setting. The cleaning notification alarm is performed while the cleaning notification alarm is not performed in the case of setting the ceiling surface, so the control means is attached to the ceiling surface when the fire alarm is attached to the wall surface. Since it is possible to change the frequency of the cleaning notification alarm depending on the case, the user can periodically clean the smoke detector in accordance with the installation situation. In particular, when a fire alarm is attached to a wall surface, a cleaning notification alarm can be frequently performed.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. 1 is a front view of a fire alarm showing Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 3 is a diagram showing a state in which a collar portion of FIG. 4 is a cross-sectional view taken along the line BB of FIG. 1, FIG. 5 is a diagram showing a state in which the collar portion of FIG. 4 is projected outside the housing, and FIG. 6 is a diagram showing an internal structure of the smoke detection unit.

  The fire alarm device includes a housing K that includes an alarm device body 1 and an attachment base 21 that is attached to an installation surface M such as a ceiling surface or a wall surface and to which the alarm device body 1 is detachably mounted. The alarm device main body 1 includes a main body portion 2 and a protective cover 11 integrally coupled to the main body portion 2 by a plurality of screws (not shown).

  The mounting base 21 includes a disk-shaped substrate 22 and a peripheral wall 23 provided on the outer peripheral edge of the substrate 22 on the main body 2 side. The peripheral wall 23 has a blade receiving portion (not shown) for engagement with the main body 2. Z).

  The main body 2 includes a disk-shaped substrate 3 and a peripheral wall 4 standing on the back side of the outer peripheral edge thereof. The peripheral wall 4 is provided with a blade portion (not shown) for engagement with the mounting base 21. It has been. Further, an installation surface setting switch 6 for setting whether the fire alarm is attached to the ceiling surface or the wall surface is attached to the front side of the substrate 3.

  The protective cover 11 is composed of a ring-shaped front wall 12 having an opening at the center and a peripheral wall 13 provided on the outer peripheral edge thereof, and a circuit board 5 is installed therein. A smoke detector 16, a speaker 17 as an acoustic unit, an acoustic stop switch 18, and the like are attached to the circuit board 5, and the smoke detector 16 protrudes from the central opening of the front wall 12. A push button 15 for operating the acoustic hole 14 and the acoustic stop switch 18 is provided below the front wall 12 corresponding to the speaker 17 and the acoustic stop switch 18. Although not described in detail, the push button 15 is an illumination type, and an indicator lamp 57 (FIG. 7) is mounted on the circuit board 5 adjacent to the acoustic stop switch 18. The installation surface setting switch 6 is connected to the circuit board 5 via wiring (not shown).

  The smoke detection unit 16 is cylindrical and has a smoke detection space A inside, and has a smoke inlet B on the outer periphery of the side surface. As shown in FIG. 6, a light emitting element 40 and a light receiving element 41 are arranged in the smoke detection unit 16 with their optical axes shifted, and a smoke detection space A is formed near the intersection of the optical axes. Yes. Further, a substantially J-shaped labyrinth member 42 is formed around the smoke detection space A with a predetermined interval, and a smoke inlet B is formed between the labyrinth members 42. Further, although the labyrinth member 42 allows smoke to flow into the smoke detection space A, external light does not enter. Therefore, smoke generated by a fire or the like can flow into the smoke detection space A via the smoke inlet B of the smoke detection unit 16, and light scattered from the light emitting element 41 is received by the light receiving element 42. A fire alarm can be issued if the light reception output is a value indicating a predetermined smoke density or more. Note that an insect net (not shown) is provided on the outer periphery of the smoke inlet B to prevent inflow of insects and dust.

  A pair of inwardly U-shaped guide rail members 32 erected from the inner surface side of the front wall 12 and abutting against the substrate 3 of the main body 2 are arranged in the left-right direction at the upper part of the smoke detection unit 16 of the front wall 12. The front wall 12 is provided with a rectangular opening 30 between the pair of guide rail members 32, and the outer surface of the front wall 12 is pivoted about the fulcrum S to be opened. A stopper member 34 for opening and closing the portion 30 is provided. In addition, a plate-like collar portion 31 in which a base portion 31 a is formed to extend in the vertical and horizontal directions is provided inside the pair of guide rail members 32, and the collar portion 31 passes through the opening portion 30 and passes through the housing K. It is housed in the housing K so as to be able to protrude and retract so that it can protrude outward. A pair of coil springs 33 as urging means for urging the collar 31 toward the outside of the housing K are provided between the collar 31 and the substrate 3 of the main body 2 at both ends in the left-right direction. The aforementioned installation surface setting switch 6 is provided at the center. Although the guide rail member 32 is provided on the protective cover 11, the guide rail member 32 may be provided on the substrate 2 of the main body portion 3 so as to stand up from the inner surface side and abut on the inner surface side of the front wall 12.

  As shown in FIGS. 2 and 4, in a state in which a part of the opening 30 is blocked by the stopper member 34, the distal end portion of the flange portion 31 comes into contact with the stopper member 34 inside the opening 30 and goes outside the housing K. Protrusions are regulated. At this time, the coil spring 33 is in a compressed state, and the installation surface setting switch 6 is in a state where the contact 6a is pressed, and the ceiling surface is set as the installation surface M.

  On the other hand, as shown in FIGS. 3 and 5, when the closed state of the opening 30 by the stopper member 34 is released, the coil spring 33 is released from the compressed state and extends, so that the flange 31 passes through the inside of the opening 30. Then, while being guided by the guide rail member 32, the base 31 a protrudes outside the housing K until it abuts on the inner surface side of the front wall 12. Further, the installation surface setting switch 6 is in a state where the pressing of the contact 6a is released, and a wall surface is installed as the installation surface M. Here, as shown in FIG. 1, it is desirable to secure a width that allows the smoke detector 16 to be hidden when viewed from the top of the fire alarm, as shown in FIG. It is desirable to secure a length enough to hide the smoke detector 16 when viewed from the side of the fire alarm. Further, the shape of the collar portion 31 is not limited to a flat plate shape, and may be an arc shape that is a distance equidistant from the smoke inlet B.

  In the fire alarm having the above-described configuration, the mounting base 21 is attached to the installation surface M by screwing or the like, the alarm body 1 is applied to the mounting base 21, and then the alarm body 1 is rotated in the circumferential direction. The blade portion (not shown) is fixed to the installation surface M by engaging the blade receiving portion (not shown) of the mounting base 21 and mounting the blade portion (not shown) on the mounting base 21.

  Next, when installed on the wall surface as the installation surface M, the stopper member 34 is rotated to release the closed state of the opening 30. Then, as shown in FIGS. 2 and 4, the flange portion 31 housed in the housing K is released from the restriction of the distal end portion thereof, and the compressed state of the coil spring 33 on the base portion 31 a side is released to extend. 3 and 5 project outside the housing K, so that dust can be prevented from accumulating at the smoke inlet B of the smoke detector 16. As a result, even if it is attached to the wall surface, it is possible to prevent the inflow of smoke from decreasing and to detect smoke accurately over a long period of time. In addition, when attaching the fire alarm to the ceiling surface, dust does not easily accumulate at the smoke inlet of the smoke detector 16 and it is not necessary to project the collar 31 outside the housing K, so that it does not get in the way. In addition, since the collar portion 31 can be kept in the housing K, the fire alarm can be used for wall surface installation and ceiling installation.

  Next, the circuit configuration of the fire alarm will be described. FIG. 7 is a block diagram showing the configuration of the fire alarm, FIG. 8 is a flowchart showing the operation of the fire alarm, and FIG. 9 is a flowchart showing the operation of the cleaning notification determination process of FIG.

  In FIG. 7, reference numeral 50 denotes a battery that supplies power to each part constituting the fire alarm, 51 denotes a control unit that has a timer circuit 60 and a storage unit 61 and controls the entire fire alarm, and 52 denotes power supplied from the battery 51. The constant voltage circuit 53 that is supplied and supplies a constant voltage to the control unit 51 and the like includes a light emitting element 40 and a light emitting circuit 54. A light emitting unit 56 that emits light and emits light toward the smoke detection space A includes a light receiving element 41 and an amplification circuit 55, and the light receiving element 41 detects scattered light generated by smoke flowing into the smoke detection space A. This is a light receiving unit that receives light, amplifies the light reception output by the amplification circuit 55, and outputs the amplified light to the control unit 51.

  In addition, 57 is a display lamp, 58 is a display lamp circuit that receives various lighting control commands from the control section 51 and performs a lighting operation corresponding to the display lamp 57, 17 is the above-described speaker as an acoustic section, and 59 is a control. A voice synthesis circuit that receives various sound generation control commands from the unit 51 and outputs a corresponding sound from the speaker 17, 18 is the above-described acoustic stop switch, 6 is the above-described installation surface setting switch, and the collar unit 31 is a housing In the state housed in K, the contact 6a is pressed and closed to set the ceiling surface as the installation surface M, and the contact 6a is released in the state in which the flange 31 protrudes outside the housing K. Then, the wall surface is set as the installation surface M by opening.

  The light emitting unit 53 and the light receiving unit 56 constitute the smoke detecting unit 16 of FIG. 2, and the control unit 51, the constant voltage circuit 52, the indicator lamp 57, the indicator lamp circuit 58, and the voice synthesis circuit 59 are included in the circuit board 5. It is mounted on. And the battery 50 is accommodated in the alarm main body 1 of FIG. 2, for example.

  The acoustic unit 17 is an example of a cleaning notification alarm unit that performs a cleaning notification alarm of the smoke detection unit 16. The control unit 51 is an example of a control unit that variably sets the notification specification of the cleaning notification alarm of the cleaning notification unit based on the setting state of the installation surface setting switch 6, and the installation surface M is used for setting the wall surface. In this case, the notification interval of the cleaning notification alarm is made shorter than in the case of setting the ceiling surface, or if the installation surface M is a wall surface setting, the cleaning notification alarm is performed, while if the ceiling surface setting is performed, cleaning is performed. It is an example of the control means which does not perform a notification alarm.

  Next, prior to the flowchart of FIG. 8, the characteristics of the cleaning notification determination process (FIG. 9) by the control unit 51 will be described. As described above, the fire alarm has a configuration in which the smoke detector 16 is provided so as to protrude from the front surface of the housing K. Therefore, even if the installation surface M is a ceiling surface or a wall surface, Etc. are deposited. In particular, when it is attached to a wall surface and used for a long time, dust or the like accumulates on the upper part of the smoke inlet B, and this dust reduces the inflow property of smoke into the smoke detection unit 16. In the case of wall surface installation, even if the flange 31 protrudes outside the housing K, dust or the like may be generated above the smoke inlet B due to airflow flowing in a direction parallel to the ceiling surface, compared to the case of ceiling surface installation. Easy to deposit. Therefore, the notification specification of the cleaning notification alarm of the smoke detector 16 is variably set based on the setting state of the installation surface setting switch 6. Specifically, when the installation surface M is set to the ceiling surface, the alarm interval is set to, for example, 6 months, while when the installation surface M is set to the wall surface, the alarm interval of the cleaning notification alarm is set to, for example, 1 month. When the installation surface M is a wall surface setting, the user can periodically set a smoke detection unit according to the installation situation by setting the cleaning notification alarm interval shorter than the ceiling surface setting. 16 is encouraged to clean. When a fire alarm is installed on the ceiling surface, even if some dust accumulates at the smoke inlet B, most of it will fall off immediately due to a sideways air flow, etc. In this case, while the cleaning notification alarm is performed, the cleaning notification alarm may not be performed when the ceiling surface is set.

  FIG. 8 is a flowchart showing the operation of the fire alarm. First, although not described in detail, when a power source is turned on by connecting a connector (not shown) of the battery 50 to a connector (not shown) of the circuit board 5 (S1), the timer circuit 60 is After performing various initial settings such as resetting the timer count to be counted (S2), cleaning notification determination processing described later is performed (S3), and then fire determination processing is performed (S4). Although not described in detail as the fire determination process, the light emitting circuit 54 emits the light emitting element 40 in response to the light emission control command from the control unit 51 and irradiates light toward the smoke detection space A. The light receiving element 41 receives scattered light generated by the smoke flowing into the smoke space A, amplifies the received light output by the amplifier circuit 55, and outputs the amplified light to the control unit 51. The control unit 51 receives the amplified light output at a predetermined smoke density. By determining whether or not the value indicates the above, it is determined whether or not there is a fire.

  And if it is a fire (S5), for example, a fire alarm process such as outputting a fire alarm sound such as “It is a fire is a fire” from the acoustic unit 17 or lighting the indicator light 57 (S6), On the other hand, if it is not a fire (S5), a fire alarm stop process is performed (S7), and the process returns to step S3. The fire alarm stop process is a process of maintaining the initial state where the alarm sound of the sound unit 17 is stopped and the indicator lamp 57 is not lit.

  Next, a switch state determination process of the acoustic stop switch 18 is performed, and when the acoustic stop switch 18 is turned on (S8), a fire alarm sound stop process for setting the acoustic unit 17 to the alarm sound stop state is performed (S9). Alternatively, if the sound stop switch 18 is off (S8), the process returns to step S3, and thereafter the operations of steps S3 to S9 are repeated.

  FIG. 9 is a flowchart showing details of the cleaning notification determination process (S3) of FIG. First, the setting state of the setting surface setting switch 6 is read, and if the setting surface setting switch 6 is turned on (S31), the ceiling surface is set as the installation surface M. By storing the month in the storage unit 61, the notification timing (alarm interval) of the cleaning notification alarm is set (S32). On the other hand, if the setting surface setting switch 6 is off (S31), a wall surface is set as the installation surface M. Since it is set, the notification timing of the cleaning notification alarm is set by storing, for example, one month in the storage unit 61 as the notification timing of the cleaning notification alarm (S33).

  Next, after the timer circuit 60 counts the timer (S34), it is determined whether the notification timing of the cleaning notification alarm has arrived (S35). That is, when the timer count of the timer circuit 60 has exceeded the notification timing stored in the storage unit 61, the notification timing has arrived (S35). For example, “the time for cleaning the smoke detection unit 16 has come. Perform cleaning notification alarm processing such as outputting a cleaning notification alarm sound such as “remove dust near the inlet B” from the acoustic unit 17 or blinking the indicator light 57 (S36). If the timer count exceeds the notification timing stored in the storage unit 61, the notification timing is not reached (S35), and the cleaning notification alarm process is not performed.

  Then, when the acoustic stop switch 18 is turned on (S37), the acoustic stop switch 18 is turned on (S37), the acoustic unit 17 is set to the alarm sound stopped state, and the indicator lamp 57 is turned off. After the stop process is performed (S38), the timer count of the timer circuit 60 is reset (S39). If the acoustic stop switch 18 is off (S37), the cleaning notification determination process is terminated.

  As described above, when the fire alarm is attached to the ceiling surface, the contact portion 6a of the installation surface setting switch 6 is pressed by keeping the collar portion 31 housed in the housing K, so that the control portion 51 can determine that the installation surface setting switch 6 is installed on the ceiling surface, and based on that, sets the notification specification of the cleaning notification alarm of the cleaning alarm reporting means, and the smoke detection unit 16 The cleaning notification alarm can be performed. On the other hand, when the fire alarm is attached to the wall surface, the pressing of the contact 6a of the installation surface setting switch 6 is released by projecting the collar portion 31 to the outside of the housing K. The setting state of the setting switch 6 can determine that the wall is installed, and based on that, the notification specification of the cleaning notification alarm of the cleaning alarm reporting means is set, and the cleaning notification alarm of the smoke detector 16 is performed. Can be made.

  In addition, when the installation surface M is a wall surface setting, the control unit 51 shortens the alarm interval of the cleaning notification alarm as compared with the ceiling surface setting, or when the installation surface M is a wall surface setting, While the cleaning notification alarm is performed, the cleaning notification alarm is not performed in the case of setting the ceiling surface, so the control unit 51 is installed when the fire alarm is attached to the wall surface or when it is attached to the ceiling surface. Thus, the frequency of the cleaning notification alarm can be varied, so that the user can periodically clean the smoke detector 16 in accordance with the installation situation. In particular, when a fire alarm is attached to a wall surface, a cleaning notification alarm can be frequently performed.

The front view of the fire alarm which shows Example 1 of this invention. AA sectional drawing of FIG. The figure which shows the state which protruded the collar part of FIG. 2 outside the housing | casing. BB sectional drawing of FIG. The figure which shows the state which protruded the collar part of FIG. 4 outside the housing | casing. The figure which shows the internal structure of a smoke detection part. The block diagram which shows the structure of the fire alarm of FIG. The flowchart which shows the operation | movement of the fire alarm of FIG. The flowchart which shows the detail of the cleaning notification determination process of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Alarm main body, 2 Main body part, 3 Board | substrate, 4 Perimeter wall, 5 Circuit board, 6 Installation surface setting switch, 6a Contact, 11 Protective cover, 12 Front wall, 13 Perimeter wall, 14 Sound hole, 15 Push button, 16 Smoke detection Part, 17 sound part (cleaning notification alarm means), 18 sound stop switch, 21 mounting base, 22 substrate, 23 peripheral wall, 30 opening part, 31 collar part, 31a base part, 32 guide rail member, 33 coil spring (biasing member) ), 34 stopper member, 40 light emitting element, 41 light receiving element, 42 labyrinth member, 50 battery, 51 control unit (control means), 52 constant voltage circuit, 53 light emitting unit, 54 light emitting circuit, 55 amplifier circuit, 56 light receiving unit, 57 indicator lamp, 58 indicator lamp circuit, 59 voice synthesis circuit, 60 timer circuit, 61 storage unit, A smoke detection space, B smoke inlet, K housing, M Surface, S fulcrum.

Claims (2)

In a fire alarm with a smoke detector protruding from the front of the housing,
When projecting out of the housing, a saddle that prevents dust from accumulating at the smoke inlet of the smoke detector is housed in the housing so as to freely advance and retract ,
An installation surface setting switch for setting a ceiling surface or a wall surface as an installation surface of the fire alarm;
Cleaning notification alarm means for performing a cleaning notification alarm of the smoke detection unit,
Control means for variably setting the notification specification of the cleaning notification alarm means based on the setting state of the installation surface setting switch,
The installation surface setting switch is configured such that a contact point is pressed by the flange when the flange is housed in the housing, and a ceiling surface is set as the installation surface, while the flange is the housing. The fire alarm is characterized in that when the projection protrudes to the outside, the contact is released and the wall surface is set as the installation surface . When the installation surface is a wall surface setting, the control means shortens the notification interval of the cleaning notification alarm than the ceiling surface setting, or when the installation surface is a wall surface setting, The fire alarm according to claim 1 , wherein the cleaning notification alarm is performed while the cleaning notification alarm is not performed when the ceiling surface is set .

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