WO2011007220A1

WO2011007220A1 - Fire alarm

Info

Publication number: WO2011007220A1
Application number: PCT/IB2010/001434
Authority: WO
Inventors: 岡　昭一; 哲弘西川
Original assignee: パナソニック電工株式会社
Priority date: 2009-06-24
Filing date: 2010-06-15
Publication date: 2011-01-20
Also published as: EP2447922B1; EP2447922A4; DK2447922T3; JP2011008444A; EP2447922A1

Abstract

A fire alarm, provided with a case having an air-current induction inlet (11a) and a detector element (12a) disposed in close proximity to the air-current induction inlet (11a) within the case, can prevent, in the initial stages of fire detection, alarm output becoming unstable due to the air vibrations caused by a speaker. When the fire alarm is arranged upon a wall surface, the air-current induction inlet (11a) is formed in a section of the upper surface of the case and the interior of the case is provided with a partition wall (13a) for separating the detector element (12a) and an acoustic element (180) for sounding an alarm. Thus, during the initial stages of fire detection, the instability of alarm output due to air vibrations caused by a speaker can be prevented.

Description

Description Fire Alarm Technical Field

The present invention relates to an improvement in a fire alarm having a structure in which an airflow inlet is provided in a casing of a device and a detection element is provided in the vicinity of the air inlet in the casing.

Background art

Conventionally, fire alarms that are fixed to the ceiling surface or wall surface are widely available in the form of a detector that protrudes from the center of the main unit.

For example, the fire alarm described in the following Patent Document 1 also has such a shape. Specifically, a smoke sensing chamber composed of a light emitting part, a light receiving part, a labyrinth wall, etc. is projected from the disc-shaped main body, and this smoke sensing room is covered with a bottomed cylindrical insect repellent cover. A speaker that outputs an alarm is arranged directly above the door, and the insect cover and spin force are covered with a protective cover.

In this structure, the top surface of the insect cover acts as a partition wall that separates the speaker housing space from the smoke sensing chamber. The partition wall has a vent hole that communicates with the smoke detection chamber so that sufficient sound pressure can be obtained by sufficient vibration of the speaker. There are many sound holes on the top of the protective cover that covers the sound output surface of the speaker.

[Patent Document 1] JP 2009-031833 A

Disclosure of the invention

However, the fire alarm described in Patent Document 1 has a vent hole in the partition wall that partitions the speaker housing space and the smoke detection room, so in the initial stage of fire detection, the smoke detection room The phenomenon that air currents containing smoke particles that flow into the air flow out of the smoke detection chamber due to air vibrations from the speakers occurs, and as a result, the alarm output stops and restarts repeatedly and becomes unstable. there were.

The above-mentioned problem is also expected for a fire alarm with a structure in which an airflow inlet is provided in the housing of the device and a detection element is provided near the air inlet in the housing. Is not recommended.

Therefore, the present invention provides a fire alarm having a structure in which an airflow inlet is provided in the housing of the apparatus, and a detection element is provided in the vicinity of the airflow inlet in the housing. The purpose of this is to prevent the phenomenon that the alarm output becomes unstable.

The fire alarm according to the present invention includes an air flow inlet in a housing of the device, and the air flow guide in the housing. In the fire alarm device in which a detection element is disposed in the vicinity of the entrance, the air flow inlet is opened in a portion that becomes an upper surface of the housing when the device is installed on a wall surface, and in the housing. Is provided with a partition wall that separates the detection element and an acoustic element that sounds an alarm. Here, the detection element may be a heat detection element or a smoke detection element.

Further, the portion of the housing where the air flow inlet is opened may be an inclined surface that forms an acute angle smaller than 90 ° with the wall surface when the apparatus is installed on the wall surface.

Further, the housing is formed when the device installed on the wall is viewed from the front, and a sound passing portion for the acoustic element is provided on the front surface thereof, and on the rear surface side thereof, When the device installed on the wall surface is viewed from the front, a mounting base portion smaller than the casing may be provided so as to be hidden by the casing.

According to the present invention, even if the acoustic element rings and vibrates the air in the housing, the vibration does not propagate to the space where the detection element is arranged because of the partition wall. Therefore, at the initial stage of fire detection, the air vibration by the acoustic element does not disturb the airflow in the vicinity of the detection element and the alarm output does not become unstable. In addition, even if the detection element is housed inside the housing, there is an advantage that the sensitivity is not lowered, the fire alarm can be made small and thin, and the degree of freedom in design is improved. In addition, when the device is installed on the wall surface, the part where the air flow inlet is opened has an inclined surface that makes an acute angle smaller than 90 ° with the wall surface. Since the air flow inlet is at a position where the pressure of the air flow going up becomes high, the air flow can be taken in efficiently. Also, if the air flow inlet is formed along the inclined surface, a larger area of the air flow introducing hole can be secured than if it is formed in a plane upright with respect to the wall surface.

In addition, when the device installed on the wall is viewed from the front, a sound-passing part is provided on the front side, and a mounting base part smaller than the housing is provided on the rear side. When the equipment is viewed from the front, the mounting base is hidden by the housing. At first glance, it looks like the power of wall installation, and the interior is good.

Brief Description of Drawings

[Fig. 1] is a partially enlarged cross-sectional view of the fire alarm of the present embodiment taken along the line II in Fig. 2 (b).

[Fig.2] (a) to (c) are the elevation, plane and side views of the fire alarm of this example, respectively.

[Fig. 3] is an exploded view of the fire alarm of this embodiment.

FIG. 4 is a partially exploded view for explaining a partition wall. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described using a wall-mounted thermal fire alarm as an example. However, the present invention can be applied not only to a thermal fire alarm but also to a smoke fire alarm. As shown in Fig. 1 and Fig. 2 (a) to Fig. 2 (c) and Fig. 3, the fire alarm 1 is a wall-fixed type that is fixed to the wall surface via a bracket 15 that serves as a mounting base. A basic configuration that houses a main board 1 2, a push button 1 6 that constitutes an operation section, and a speaker 1 8 that constitutes an acoustic element in a housing consisting of a base panel 1 1, a body panel 1 3, and a cover panel 1 4 It is. The bracket 15 is made smaller than the housing so that the fire alarm 1 installed on the wall is hidden by the housing when viewed from the front. The bracket 15, the base panel 11, and the body panel 13 are resin molded products. The cover panel 14 is provided with a sound passing part 14 a to which a metal net is attached.

In particular, the appearance shown in Fig. 2 (a) to Fig. 2 (c) is very different from the conventional ceiling-mounted type. That is, at first glance, it is shaped like a wall-mounted speaker and is also good for interior.

The base panel 11 is formed with an air flow inlet port 1 1 a for introducing an air flow accompanied by heat, a power battery housing portion 1 1 b, a main board housing portion 1 1 c, and the like. In particular, in this example, the portion where the air flow inlet 1 1 a of the base panel 1 1 is opened is smaller than 90 ° between the wall and the fire alarm 1 when it is installed on the wall. It has an inclined surface that forms a depression.

In this way, the air flow inlet 1 1 a comes to a position where the air pressure is increased by the air flow from the top to the bottom (indicated by the arrow in Fig. 1), so that the air flow can be taken in efficiently. . Further, by using the inclined surface, a larger area of the air flow inlet port 11a can be secured. Further, on the back side of the base panel 11, there is an engaging portion that engages with a locking claw 15 a formed on the bracket 15. On the other hand, the bracket 15 is formed with a screw hole 15 b through which a screw for fixing to the wall surface is passed in addition to the locking claw 15 a. After the bracket 15 is fixed to the side via a screw, the fire alarm 1 is installed on the wall by locking the engaging part of the base panel 1 1 to the locking claw 15 5a of the bracket 15 The

Main board 12 is made of glass fiber, epoxy, paper, or printed circuit board manufactured from other suitable materials. Thermistor and other thermal sensing elements 1 2 a, microcomputer, audio output circuit, switch 1 2 b. Various electronic parts such as light emitting diodes are mounted, and metal parts 1 2 c for holding one or more (for example, four) power supply batteries are fixed. The heat detection element 12 a is mounted so as to protrude from the main board 12 so as to be positioned immediately below the air flow inlet 11 a when the alarm is fixed to the wall surface.

As shown in FIGS. 1 and 4, the main board 1 2 and the speaker 1 8 are attached to the body panel 1 3, and the space where the heat detection element 1 2 a is arranged, and the space where the speaker 18 is arranged A partition wall 1 3 a is provided for separating the two. In this embodiment, no holes are formed in the partition wall 13a, and the sound passage 14a is provided in the front of the housing when the fire alarm installed on the wall is viewed from the front. . As a result, the output of the speaker is effectively propagated through the sound passing portion 14 a and it is possible to prevent the thermal airflow from being disturbed by the air vibration by the speaker. In this example, the partition wall 1 3 a is shaped like a plate only between the heat sensing element 1 2 a and the speaker 1 8. However, it may be configured as a continuous wall that surrounds the back of the speaker 18. Alternatively, it may be formed as a wall that encloses the heat detection element 1 2 a.

In this example, even if the speaker 18 rings and vibrates the air in the casing, the vibration does not propagate into the space where the heat detection element 12 a is disposed because of the partition wall 13 a. For this reason, in the initial stage of fire detection, the thermal air current is disturbed by the air flow due to the air vibration by the speaker 18 and the alarm output does not become unstable. In addition, even if the heat detection element 1 2 a is housed inside the housing, there is no reduction in sensitivity, the fire alarm 1 can be made smaller and thinner, and the design flexibility of the fire alarm 1 is improved. There are also advantages.

The push button 16 is an operation unit that receives an alarm stop operation or the like, and is, for example, a resin molded product such as FRP (FinberReinforcerdePlastic). A pressing operation piece and an elastic support piece 16 c are formed so as to protrude from one end of the operation piece 16 a to be pushed. Each part of the push button 16 may be integrally formed, or may be integrated after being formed individually. The pressing operation piece is at a position corresponding to the switch 1 2 b mounted on the main board 12, and when the operation piece 16 a is pressed, the switch 12 b is pressed.

The light guide 1 is a transparent resin component that guides the light emitted from the light emitting diode mounted on the main board 12 to the illumination hole 16 d formed in the push button 16. The light-emitting diode lights up and flashes according to the operating state of the fire alarm 1, and the light can be seen through the illumination hole 16d. Emblem 20 is a decorative part on which a model number or a manufacturer's logo is printed.

Explain the basic operation of Fire Alarm 1. The fire alarm 1 has a standby mode in which the operation of the heat detection element 1 2 a, etc. is stopped to reduce power consumption, and a monitoring mode in which the heat detection element 1 2 a is operated to monitor the fire. It has a function to repeat every predetermined time. For example, the standby mode may be 30 seconds and the monitoring mode may be 1 second, and can be changed appropriately as necessary. In the monitoring mode, the temperature is measured by operating the heat detection element 1 2 a a predetermined number of times, and a fire is determined based on the number of times the measured temperature exceeds a predetermined value. If it is determined that a fire has occurred, a fire alarm is output and the light emitting diode is turned on. This fire alarm continues until the alarm stop operation is performed by push button 16. Also, the output voltage of the power supply battery is monitored every predetermined time. If the output voltage is lower than the predetermined value, the light-emitting diode blinks to prompt the user to replace the battery.

The present invention is not limited to the present embodiment, and various modifications can be made without departing from the scope of the present invention.

Claims

The scope of the claims

[Claim 1]

In a fire alarm device comprising a casing provided with an airflow inlet and a detection element disposed in the vicinity of the airflow inlet in the casing,

The air flow inlet is opened in a portion that becomes the upper surface of the housing when the fire alarm is installed on the wall surface,

A fire alarm device comprising: a partition wall separating the space in which the detection element is disposed and the space in which an acoustic element for sounding an alarm is disposed in the housing.

[Claim 2]

In claim 1,

The portion of the housing where the air flow inlet is opened is a fire alarm having an inclined surface that forms an acute angle with the wall when the fire alarm is installed on the wall.

[Claim 3]

In claim 1 or 2,

When the fire alarm installed on the wall is viewed from the front, the housing is provided with a sound passage for the acoustic element on the front thereof, and

A fire alarm provided with a mounting base portion smaller than the casing on the back side.