JP2009301465A - Fire alarm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately detect smoke over a long period of time while preventing the decline of the inflow property of smoke even when attached especially to a wall surface. <P>SOLUTION: In the fire alarm provided with a smoke detection part projected from the front surface of a casing, a dust removal means for removing dust deposited near the smoke inflow port of the smoke detection part is movably provided on the front surface of the casing. The dust removal means includes a protective member which covers the front surface of the smoke detection part and is movably engaged with the front surface of the casing, and an air blower which is provided between the protective member and the smoke detection part and discharges air near the smoke inflow port when the protective member is pressurized. The protective member is capable of pressurizing an inspection switch or a sound stop switch. <P>COPYRIGHT: (C)2010,JPO&INPIT

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.

  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 present invention, in a fire alarm provided with a smoke detector projecting from the front surface of the housing, a dust removing means for removing dust accumulated near the smoke inlet of the smoke detector is movable on the front surface of the housing. It is provided as possible.

  The dust removing means is provided between the protection member and the smoke detection unit, a protection member that covers the front surface of the smoke detection unit and is movably engaged with the front surface of the housing. And an air blower that discharges air to the vicinity of the smoke inlet when the operation is performed.

  In addition, the protective member is capable of pressing an inspection switch or an acoustic stop switch.

  The present invention provides a fire alarm provided with a smoke detector projecting from the front surface of the housing, and a dust removing means for removing dust accumulated near the smoke inlet of the smoke detector is movable on the front surface of the housing. Since it is possible to prevent dust from continuing to accumulate in the vicinity of the smoke inlet of the smoke detection unit by moving the dust removing means, it is possible to prevent smoke even if attached to the wall surface. This makes it possible to accurately detect smoke over a long period of time. Further, since the dust removing means can be moved from the front surface of the housing, the user can easily operate it.

  The dust removing means covers a front surface of the smoke detection unit and is movably engaged with the front surface of the housing, and is provided between the protection member and the smoke detection unit. Air blower that discharges air in the vicinity of the smoke inlet when it is pressed, so just by pressing the protective member that is located on the front side of the fire alarm and that is easy to operate , Dust can be removed.

  In addition, since the protective member can be operated by pressing the inspection switch or the acoustic stop switch, it is possible to form an inspection or acoustic stop button that is large and easy to press without enlarging the casing. In addition, a dedicated button for pressing the inspection or sound stop switch can be eliminated. Furthermore, by periodically checking the fire alarm device, the user can periodically remove dust without intention.

  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 of FIG. 1, FIG. 3 is a diagram showing a state in which the protective member of FIG. The figure which shows the internal structure of a smoke detection part, FIG. 5 is a block diagram which shows the structure of a fire alarm, FIG. 6 is a flowchart which shows the operation | movement of a fire alarm.

  The fire alarm device includes a housing K that includes an alarm device body 1 and a mounting base 21 that is attached to a wall surface M as an installation 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.

  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. The circuit board 5 is provided with a smoke detector 16 at the center, a speaker 17 as an acoustic unit at the upper part, an inspection / acoustic stop switch 18 and an indicator lamp 57 at the lower part, and the smoke detector 16. Is provided so as to protrude from the central opening of the front wall 12. The front wall 12 is provided with an acoustic hole 14 in the upper part corresponding to the speaker 17, and an indicator lamp hole 19 in the lower part corresponding to the indicator lamp 57.

  The smoke detection unit 16 is cylindrical and has a smoke detection space A inside, and is provided with a smoke inlet B on the outer periphery of the side surface. The smoke detection unit 16 covers the opening of the optical table 43 and the cylindrical optical table 43 that opens on the front surface. And an optical bench cover 45. As shown in FIG. 4 as a horizontal sectional view of the optical bench 43, a light emitting element 40 and a light receiving element 41 are arranged in the smoke detector 16 with their optical axes shifted from each other, and near the intersection of the optical axes. Forms smoke detection space A. 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.

  In addition, an insect net 48 is provided on the outer periphery of the smoke inlet B to prevent the inflow of insects and dust. The insect screen 48 is housed in grooves 44 and 46 provided on the outer periphery of the optical bench 43 and the optical bench cover 45.

  On the front side of the smoke detection unit 16, a protection member 31 that covers the front surface of the smoke detection unit 16 and that is movably engaged with the front surface of the housing K is provided. The protective member 31 is a disk-like plate-like portion 32 that covers the front surface of the smoke detector 16, and is suspended from the outer peripheral edge of the plate-like portion 32 toward the protective cover 11, and on the inner peripheral side of the front wall 12. It is comprised from the some leg part 33 engaged with the provided engagement hole 15. As shown in FIG. The plurality of leg portions 33 are provided on the outer peripheral edge of the plate-like portion 32 at equal intervals, for example, four vertically and horizontally. Here, the lower leg portion 33 a is provided so as to engage with the lower engagement hole 15 a corresponding to the inspection / sound stop switch 18 and face the front surface of the inspection / sound stop switch 18. Although the details will be described later, the protective member 31 functions as a check / sound stop button for turning on the check / sound stop switch 18 by being pressed. In this way, the large protective member 31 provided in the center of the front surface of the housing K is also functioned as a check and sound stop button, so that a dedicated button is eliminated and the housing K is not enlarged. An easy-to-press check or sound stop button can be formed.

  An air blower 34 having a plurality of discharge ports 35 is provided between the protection member 31 and the smoke detector 16. As shown in FIG. 2, the plurality of discharge ports 35 are inserted between the through holes 47 provided corresponding to the optical bench cover 45 and are located between the smoke inlet B and the insect net 48. When the protective member 31 is pressed, air is discharged near the smoke inlet B. As shown in FIG. 1, the plurality of discharge ports 35 are provided only on the upper part of the smoke detection unit 16 where dust is likely to accumulate, but may be provided on the entire outer periphery of the smoke detection unit 16. The protective member 31 and the air blower 34 constitute a dust removing unit 30.

  As shown in FIG. 2, in the normal state where the protective member 31 is not pressed, the air blower 34 is held in an expanded state in which air is taken into the inside, and air is not discharged from the discharge port 35. In addition, the claw portion provided on the front end side of the plurality of leg portions 33 is in contact with and locked to the back side of the front wall 12.

  On the other hand, as shown in FIG. 3, the air blower 34 is pressed and contracted when the user presses the protective member 31 in order to remove dust accumulated in the vicinity of the smoke inlet B of the smoke detector 16. Thus, the internal air is discharged from the discharge port 35 between the smoke inlet B and the insect net 48. As a result, dust accumulated near the smoke inlet B, specifically, the outer peripheral surface of the insect screen 48 is blown up by the air from the inner peripheral surface and removed from the outer peripheral surface. This makes it possible to accurately detect smoke over a long period of time. The position of the discharge port 35 is not limited to the above. For example, the discharge port 35 is provided on the outer peripheral surface side of the insect screen 48 so that air is discharged substantially parallel to the outer peripheral surface to remove dust. In addition, as a structure in which air is discharged into the smoke detection unit 16 (smoke detection space A) through the discharge port 35, dust accumulated in the smoke detection unit 16 is removed and the inside of the smoke detection unit 16 is removed. The air from the air may remove dust accumulated on the insect screen 48 via the smoke inlet B.

  Further, by pressing the protective member 31, the lower leg 33a comes into contact with the inspection / acoustic stop switch 18, and the inspection / acoustic stop switch 18 is turned on. Inspection is performed. Therefore, by periodically checking the fire alarm device, the user can periodically remove dust without intention.

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

  Next, the circuit configuration of the fire alarm will be described. FIG. 5 is a block diagram showing the configuration of the fire alarm, and FIG. 6 is a flowchart showing the operation of the fire alarm.

  In FIG. 5, reference numeral 50 denotes a battery for supplying power to each part constituting the fire alarm, 51 denotes an inspection part 60 and a storage part 61, a control part for controlling the entire fire alarm, and 52 denotes power from the battery 50. A constant voltage circuit 53 that is supplied and supplies a constant voltage to the control unit 51 and the like, 53 has a light emitting element 40 and a light emitting circuit 54, and the light emitting circuit 54 receives the light emission control command from the control unit 51. 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 the above-described indicator lamp, 58 is a display lamp circuit that receives various lighting control commands from the control unit 51 and performs a lighting operation corresponding to the indicator lamp 57, 17 is the above-described speaker as an acoustic unit, 59 Is a voice synthesizing circuit that receives various sound generation control commands from the control unit 51 and outputs the corresponding sound from the speaker 17, 18 is the above-described inspection and sound stop switch, and functions as an inspection switch in a normal state, Functions as an acoustic stop switch in a fire alarm state.

  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, constant voltage circuit 52, indicator lamp 57, indicator lamp circuit 58, and speech 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.

  Next, the inspection process by the control unit 51 will be described prior to the flowchart of FIG. As described above, when the switch is turned on in the normal state, the inspection / acoustic stop switch 18 functions as the inspection switch 18, and the control unit 51 uses the inspection function of the inspection unit 60 to perform the inspection process as a smoke detection unit. 16 abnormality detection processing and voltage value abnormality detection processing of the battery 50 are performed. As the abnormality detection process of the smoke detection unit 16, the output value monitoring process of the smoke detection unit 16 is performed. Although not described in detail, the control unit 51 causes the light emitting element 40 to emit light according to the light emission control command, and receives the light receiving element 41. If the output value in the absence of smoke is outside the range of the upper limit value and the lower limit value indicating an abnormality, it is determined that the output value is abnormal. Although the voltage value abnormality detection process of the battery 50 is not described in detail, the control unit 51 inputs the output voltage value of the battery 50, and if this voltage value is equal to or lower than the lower limit value, the voltage value abnormality ( Battery life is coming).

  FIG. 6 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), various initial settings are made. (S2), and then a fire determination process is performed (S3). 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.

  If it is a fire (S4), for example, a fire alarm process such as outputting a fire alarm sound such as “fire is a fire” from the acoustic unit 17 or lighting the indicator light 57 is performed (S8). In this state, when the inspection / acoustic stop switch 18 is turned on (S9), the switch 18 functions as an acoustic stop switch, the acoustic unit 17 is set in the alarm sound stop state, and the indicator light 57 After performing a fire alarm stop process for turning off the light (S10), the process proceeds to step S5.

  On the other hand, if it is not a fire (S4), the operation proceeds from step S8 to step S10 without proceeding to step S5, and the state of the inspection / acoustic stop switch 18 is determined. If the inspection / sound stop switch 18 is off (S5), the process returns to step S3, and thereafter, the operations of steps S3 to S10 are repeated. If the inspection / acoustic stop switch 18 is on (S5), the switch 18 functions as an inspection switch to perform the inspection process as described above, for example, the abnormality detection process of the smoke detector 16 and the battery. 50 voltage value abnormality detection processing is performed (S6). Then, after the inspection result is alarmed as the inspection result alarm processing (S7), the process returns to step S3, and thereafter the operations of steps S3 to S10 are repeated. The inspection result alarm processing is not described in detail, but if it is normal, for example, a normal alarm sound such as “normal” is output from the acoustic unit 17 a predetermined number of times, or the indicator lamp 57 is output for a predetermined time. Perform normal alarm processing such as lighting. If it is abnormal, for example, an abnormal alarm process such as outputting an abnormal alarm sound such as “abnormal” from the sound unit 17 a predetermined number of times or blinking the indicator lamp 57 for a predetermined time is performed.

  As described above, in the fire alarm provided with the smoke detection unit 16 protruding from the front surface of the housing K, the dust removing means 31 and 34 for removing dust accumulated near the smoke inlet B of the smoke detection unit 16 are provided in the housing. Since it is provided movably on the front surface of the body K, it is possible to prevent dust from continuing to accumulate in the vicinity of the smoke inlet B of the smoke detector 16 by moving the dust removing means 31, 34. Therefore, even if it is attached to the wall surface M, it is possible to prevent smoke from being deteriorated and to detect smoke accurately for a long time. Moreover, since the dust removal means 31 and 34 can be moved from the front surface of the housing | casing K, a user is easy to operate.

  The dust removing means 31 and 34 are provided between the protection member 31 and the smoke detection unit 16 that cover the front surface of the smoke detection unit 16 and are movably engaged with the front surface of the housing K. The air blower 34 that discharges air to the vicinity of the smoke inlet B when the protective member 31 is pressed is provided, so that the protective member is located on the forefront side of the fire alarm and is easy to operate. Dust can be removed by simply pressing 31.

  Further, since the protective member 31 can be operated to press the inspection switch or the acoustic stop switch 18, a large and easy-to-press inspection or acoustic stop button can be formed without increasing the housing K. . Further, a dedicated button for pressing the inspection or sound stop switch 18 can be eliminated. Furthermore, by periodically checking the fire alarm device, the user can periodically remove dust without intention.

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 pressed the protection member of FIG. 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 operation | movement of the fire alarm of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Alarm body 2 Main body part 3 Board | substrate 4 Perimeter wall 5 Circuit board 11 Protection cover 12 Front wall 13 Perimeter wall 14 Sound hole 15 Engagement hole 15a Lower engagement hole 16 Smoke detection part , 17 Sound section, 18 Inspection / acoustic stop switch, 19 Indicator light hole, 21 Mounting base, 22 Substrate, 23 Perimeter wall, 30 Dust removing means, 31 Protection member, 32 Plate-shaped section, 33 Leg section, 33a Leg, 34 Air blower, 35 Discharge port, 40 Light emitting element, 41 Light receiving element, 42 Labyrinth member, 43 Optical stand, 44 groove, 45 Optical stand cover, 46 groove, 47 Insertion hole, 48 Insect net, 50 battery, 51 Control Unit, 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 speech synthesis circuit, 60 inspection unit, 61 memory | storage part, A smoke detection space, B smoke inlet, K housing | casing, M wall surface (installation surface).

Claims (3)

In a fire alarm with a smoke detector protruding from the front of the housing,
A fire alarm device, wherein dust removing means for removing dust accumulated in the vicinity of the smoke inlet of the smoke detector is movably provided on the front surface of the casing.   The dust removing means is provided between a protection member that covers the front surface of the smoke detection unit and is movably engaged with the front surface of the housing, and is pressed between the protection member and the smoke detection unit. The fire alarm according to claim 1, further comprising an air blower that, when operated, discharges air in the vicinity of the smoke inlet.   The fire alarm according to claim 1, wherein the protective member is capable of pressing an inspection switch or an acoustic stop switch.

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