JP5213141B2 - Flame detector - Google Patents

Description

The present invention relates to a flame detector that is installed outdoors and detects a flame caused by a fire to sound an alarm.

  Conventionally, as a flame detector for detecting a flame due to a fire, it is used as a detector for a fire alarm facility. In other words, in addition to a fire detector, if necessary, a flame detector is connected to the signal line from the receiver installed in the fire alarm facility, and if a flame due to a fire is detected by the flame detector, a fire alarm signal is sent. It is sent to the receiver and a fire alarm is issued from the receiver.

  Such a flame detector is not limited to the inside of a building, but may be installed outdoors to monitor fires, and when installed outdoors, it has a waterproof structure to prevent rainwater from entering. . The flame detector has a detection window, detects the fire by receiving the energy from the flame by the fire detection element arranged inside the detection window, and the intrusion of rainwater by making the detection window part a sealed structure Can be prevented.

On the other hand, in recent years, in addition to the flame detector used in fire alarm equipment, a flame detector that incorporates a battery and a speaker, detects a flame caused by a fire, and outputs a sound alarm through the speaker is considered. . Such a flame detector is installed, for example, on the outer wall surface of a house where there is a risk of arson, and detects a flame and outputs a sound alarm from a speaker to notify the abnormality. In order to issue a sound alarm with a sufficient volume from a speaker driven by a battery, it is necessary to open an acoustic hole in the speaker provided inside.

Japanese Patent Laid-Open No. 10-145471 JP 2001-177616 A JP 2005-292967 A

  However, when an acoustic hole is opened for the built-in speaker, rainwater enters the inside from the acoustic hole opened to the outside during rainy weather and accumulates in the speaker housing portion, so that no sound is produced. In winter, the infiltrated rainwater may freeze and make noise.

An object of the present invention is to provide a flame detector that can reliably perform an audio alarm by a speaker even when rainwater enters from an acoustic hole.

In order to achieve this object, the present invention is configured as follows. The present invention relates to a flame detector that detects a flame caused by a fire and outputs a sound alarm, and the front surface of the speaker housing portion that protrudes from the surface continuously to the front surface of the main body extends along the vertical direction in the wall surface installed state. The upper portion is formed as an inclined surface having a large protrusion amount with respect to the lower portion, and a plurality of acoustic holes are provided in the front surface of the speaker housing portion.

  According to the present invention, even if rainwater enters the speaker housing portion from the acoustic hole of the speaker portion, it is discharged from the drainage hole formed in the lower portion of the speaker portion, and even if water accumulates, water will reach the speaker portion. Therefore, it is possible to reliably prevent rainwater from accumulating in the speaker housing and no sound from being produced.

In addition, the speaker part is formed so that the upper part protrudes from the front surface of the main body to form an edge and the protruding amount decreases downward, so that the front part of the acoustic part of the speaker part is obliquely downward, and the acoustic hole is obliquely downward. Opening it makes it difficult for rainwater to enter.

Front view of the flame detector of the present invention The perspective view of the flame detector of the present invention FIG. 2 is a perspective view of the flame detector of the present invention with the hood of FIG. 2 removed. Explanatory drawing of the speaker part of FIG. Explanatory drawing of other embodiment of the speaker part of FIG.

  FIG. 1 is a front view of a flame detector according to the present invention, and FIG. 2 is a perspective view. 1 and 2, the flame detector 1 of the present invention is provided with a detection window 9 on the upper side of the front surface 3 of the main body 2, and the inside of the detection window 9 receives and detects energy from the flame. A detection element is incorporated. A hood 10 is attached to the detection window 9 to prevent direct sunlight from entering the detection window 9.

  A speaker unit 4 is provided on the main body front surface 3 of the main body 2. As is apparent from FIG. 2, the speaker unit 4 protrudes from the front surface 3 of the main body and is integrally formed, and the upper portion of the speaker unit 4 protrudes from the front surface 3 of the main body to form an edge portion 6. The protruding amount is formed to be small, and thereby the front surface 12 of the speaker unit 4 is inclined downward. A plurality of acoustic holes 5 are opened in the front surface 12 of the speaker unit 4. A drainage hole 8 is provided at the lower part of the speaker unit 4.

  FIG. 3 is an explanatory diagram of the flame detector 1 with the hood 10 of FIG. 2 removed. The hood 10 is detachably provided on the hood mounting portion 11. The detection window 9 is provided on the inclined surface so as to be obliquely downward.

  FIG. 4 is a cross-sectional explanatory view of the speaker unit 4 in the flame detector 1 of the present invention. In FIG. 4, a substrate 13 is provided inside the main body 2, and circuit components necessary for the detection operation of the flame detector such as a CPU and electrical components (not shown) are mounted on the substrate 13. A battery 14 is built in the main body 2.

  A speaker housing portion 18 is formed inside the speaker portion 4, and the speaker 15 is fixed thereto via a rubber packing 17. The speaker 15 includes a diaphragm 16 on the front surface, and the diaphragm 16 closes the inside of the speaker housing 18 and seals the inside of the main body with a seal of a rubber packing 17.

  The upper part of the speaker part 4 protrudes from the edge part 6, and the lower part is formed so that the protruding amount is smaller than the upper part. As a result, the front face 12 of the speaker part 4 is inclined downward, that is, at an angle with respect to the vertical direction. The surface has a slope of β.

  An acoustic hole 5 is formed in the front surface 12 of the speaker unit 4, and the acoustic hole 5 is opened at an angle α obliquely downward with respect to the horizontal direction. Further, a drainage hole 8 is opened at the lower part of the speaker unit 4, and the drainage hole 8 opens obliquely downward from the narrowed bottom of the speaker storage unit 18.

  In the structure of the speaker unit 4 in the flame detector 1 of the present invention shown in FIG. 4, when the rain detector 1 receives rainwater with the flame detector 1 installed outdoors, the front surface 12 of the speaker unit 4 is vertical. In contrast, since it has a downward slope of angle β, it is less likely to receive rainwater directly compared to a vertical plane. Also, since the acoustic hole 5 opened in the front surface 12 of the speaker unit 4 is opened obliquely downward at an angle α, it is also difficult for rainwater to enter the internal speaker storage unit 18 when rainwater is directly received by this. ing.

  On the other hand, when rainwater enters from the acoustic hole 5 into the speaker housing portion 18, the speaker housing portion 18 has a shape close to a V-shaped groove that is wide at the top and narrows at the bottom. It can be efficiently discharged to the outside from the drain hole 8 that is accumulated in the lower part of the water and opens obliquely downward from the bottom. For this reason, even if rainwater enters the speaker housing portion 18 from the acoustic hole 5, it is possible to reliably prevent water from collecting and preventing the speaker 15 from sounding.

  FIG. 5 shows another embodiment of the present invention. In this embodiment, a water reservoir portion 19 is formed below the speaker housing portion 18, and a water drain hole 8 is formed from the lower portion of the water reservoir portion 19 to the front side. Is forming. In addition, the edgeless portion 20 is formed by making the rear side of the bottom of the water reservoir portion 19 into a round shape. The other structure is the same as that of the embodiment of FIG. In addition, the drain hole 8 does not need to face diagonally downward by providing the water reservoir 19. The water reservoir 19 preferably forms the edgeless portion 20, but may have an edge.

  According to the embodiment of FIG. 5, the water reservoir 19 is formed below the diaphragm 16 of the speaker 15 even if the water does not drain well from the drain hole 8 and does not drain well and accumulates slightly inside. For this reason, the remaining water is not applied to the vibration position 16. Further, the water accumulated in the water reservoir 19 exceeds the surface tension before coming into contact with the diaphragm 16 and falls out of the water drain hole 7. At this time, the bottom of the water reservoir 19 is the edgeless portion 20, so that the accumulated water is more easily discharged and does not accumulate until it hits the diaphragm 16.

1 and 2, when installed outdoors, a hood 10 is attached to the upper part of the detection window 9, and rain water from the upper part can be prevented from being applied to the speaker unit 4 by the hood 10, Only rainwater sprayed from an oblique direction by wind or the like hits the speaker unit 4, and the hood 10 can also suppress the intrusion of rainwater into the speaker unit 4.

1: Flame detector 2: Main body 3: Main body front surface 4: Speaker part 5: Acoustic hole 6: Edge part 8: Drainage hole 9: Detection window 10: Hood 11: Hood mounting part 12: Front part of speaker part 13: Base 14: Battery 15: Speaker 16: Diaphragm 17: Rubber packing 18: Speaker storage portion 19: Water reservoir 20: Edgeless portion

Claims (1)

In a flame detector that detects a fire flame and outputs a sound alarm,
The front surface of the speaker housing portion that protrudes continuously from the front surface of the main body is formed as an inclined surface having an upper portion protruding in a large amount with respect to the lower portion along the vertical direction in the wall surface installation state. A flame detector characterized by having a plurality of acoustic holes.

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