JP2010033238A - Home fire alarm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fire alarm having a detection part installed on a wall or a ceiling, which can be easily cleaned by use of a home vacuum cleaner. <P>SOLUTION: The home fire alarm 1 includes the detection part 2 having smoke detecting elements 2a and 2b arranged within a smoke sensing chamber surrounded by a labyrinth wall 2c, the detection part being provided on a head part 1b. A suction hole is formed in a body cover 1c constituting the head part 1b, and a vent hole 11 is formed within the detection part 2 to provide a ventilation path connecting the outside of the fire alarm 1 to the smoke sensing chamber. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an improvement in a residential fire alarm having a detection unit in which a smoke detection element is disposed in a smoke detection chamber surrounded by a labyrinth wall.

As an example of the above-described fire detector, the following Patent Documents 1 and 2 include a base portion fixed to a wall surface or a ceiling surface and a head portion detachably attached to the base portion. There is a description of a configuration in which the portion is provided in the head portion. However, in the detection part where the smoke detection element is placed in the smoke detection chamber surrounded by the labyrinth wall, the ventilation hole of the labyrinth wall has a complicated shape, so dust etc. accumulates there and smoke detection capability Is gradually decreasing.
JP 2003-162779 A JP2003-099875

Conventionally, in order to remove dust accumulated on such a labyrinth wall, it has been common to remove the head portion of the alarm from the base portion and clean the detection portion with an air gun, gas spray or the like. However, in order to remove the alarm head attached to the wall or ceiling surface, it is necessary to climb on a stepladder, etc., and since air guns, gas sprays, etc. are also necessary, such a resident for the house Cleaning work was not easy.
Therefore, the present invention provides a fire alarm device that can be easily cleaned by a house cleaner or the like while attached to a wall surface or ceiling.

  A fire alarm for a house according to the present invention is a fire alarm for a house, in which a head is provided with a detection unit configured by arranging a smoke detection element in a smoke detection chamber surrounded by a labyrinth wall. The main body cover is formed with an air intake hole, and a ventilation hole is formed inside the detection unit, so that a ventilation path communicating from the outside of the residential fire alarm to the smoke detection chamber is provided.

  A dust collection filter may be provided in at least one of the intake hole and the vent hole.

  Further, the intake hole and the vent hole may be blocked and allowed to communicate by a lid member.

  The fire alarm device according to the present invention is a state where it is attached to a wall surface or a ceiling surface, and the suction pipe of a cleaning device, such as a house vacuum cleaner, is placed on the detection portion and sucks air, and the intake hole, the vent hole, etc. A flow of air that flows into the smoke detection chamber from the outside of the alarm device and is exhausted from the smoke detection chamber is formed through the air passage formed by the air flow, and the labyrinth wall of the smoke detection chamber is formed by the air flow. Dust accumulated on insect screens, protective covers, etc. can be removed efficiently.

  Further, in the configuration in which the dust collection filter is provided in the intake hole or the vent hole, there is no possibility that the light emitting element, the light receiving element, the labyrinth wall, and the like are contaminated by dust mixed in the air flowing into the detection unit from the indoor space.

  In addition, in the case of a structure provided with a closing member that shields or allows communication between the intake holes and the ventilation holes, when not cleaning, the closing member closes the intake holes and the ventilation holes by its own weight. Even if no dust filter is provided, it is possible to prevent dust from flowing into the detection part through the intake hole and the vent hole. On the other hand, at the time of cleaning, the suction hole and the vent hole communicate with each other through a gap formed by lifting the closing member by the suction cylinder of the cleaner, so that cleaning using the cleaner can be performed.

Hereinafter, a fire alarm device according to the present invention will be described with reference to the drawings. This alarm device 1 is a residential fire alarm device attached to a wall surface or a ceiling surface and having a basic function of outputting an alarm when a fire is detected.
1, 2, and 3 are a perspective view, an exploded view, and a schematic vertical cutaway view showing an air flow during cleaning, showing the overall appearance of the alarm device. FIG. 4 is a horizontal block diagram of the detection unit.

  The fire alarm 1 includes a base portion 1a fixed to a wall surface or a ceiling surface, and a head portion 1b, and a detection portion 2 in which a smoke detection element is disposed in a smoke detection chamber surrounded by a labyrinth wall 2c The basic structure is arranged so as to protrude from the central portion of the head portion 1b having a space toward the indoor space.

  The resin main body cover 1c serving as a housing constituting the head portion 1b has an intake hole 10 around the detection unit 2 and a vent hole 11 inside the detection unit 2 so that the outside of the smoke detection chamber is formed. From the side, an air passage communicating with the intake hole 10 is provided. The air passage is formed by a space and a gap inside the main body cover 1c. A dust collection filter 14 is provided in at least one of the intake hole 10 and the vent hole 11.

  The head unit 1b is a circuit board on which an electrical switch that detects an alarm stop operation, an audio output unit configured with an audio IC that outputs an alarm, a control unit configured with a microcontroller, and the like, and a power source. A battery and a speaker are incorporated. In addition, since these are not directly related to this invention, illustration is abbreviate | omitted. The head portion 1b is provided with a push button 15 for performing an alarm stop operation and the like, and a drawstring 16.

  The detection unit 2 includes a labyrinth wall 2c that is doubly protected by an insect screen 3 and a protective cover 4, and a smoke detection element that is appropriately disposed in a smoke detection chamber that extends inside the labyrinth wall 2c, that is, a light emitting element 2a. And the light receiving element 2b. The labyrinth wall 2c has a complicatedly shaped vent so as to shield light and allow air to pass therethrough. The light emitting element 2a is composed of, for example, a light emitting diode, and the light receiving element 2b is a photodiode. The light emitting element 2a is in a positional relationship such that light emitted from the light emitting element 2a does not directly enter the light receiving element 2b. Further, the labyrinth wall 2c A light shielding wall is formed between the light emitting element 2a and the light receiving element 2b so that the light reflected by the light etc. does not enter the light receiving element 2b. The smoke detection operation is performed by turning on a light emitting diode provided in the light emitting element 2a. For example, the detection operation is periodically performed by lighting the light emitting element 2a once every 8 seconds. At this time, when smoke flows into the smoke detector 12, the light emitted from the light emitting element 2a is irregularly reflected by the smoke particles, and a part of the light enters the light receiving element 2b, so that the light receiving element 2b detects the light. Convert to signal and output.

  However, since the vent hole of the labyrinth wall 2c has a complicated shape as shown in FIG. 4, dust or the like accumulates there, and there is a situation that the smoke detection capability gradually decreases. Conventionally, in order to remove dust accumulated on such a labyrinth wall 2c, it is common to remove the head portion 1b from the base portion 1b and clean the detection portion 2 with an air gun, gas spray, etc. In the present invention, cleaning can be effectively performed by a cleaning device 30 having a cylindrical intake pipe, for example, a general cleaner or a general cleaner equipped with a cylindrical adapter.

  That is, in the present invention, the detection unit 2 of the alarm device that is fixed to the wall surface or the ceiling surface is covered with the intake pipe of the cleaning device 30 and sucked by the cleaning device 30, so that the labyrinth wall 2 c, the insect net 3, the protection Dust accumulated on the cover 4 can be removed. At this time, when air is sucked in from the vicinity of the detection unit 2 by the intake pipe of the cleaning device 30, air in the indoor space is sucked from the air intake hole 10 formed in the head unit 1 b due to air pressure, and the ventilation path Then, the air is guided from the ventilation path 11 to the smoke detection chamber inside the labyrinth wall 2c, and is further discharged from the ventilation hole of the labyrinth wall 2c. At this time, dust accumulated on the labyrinth wall 2c is also discharged together with air, so that the detection unit 2 can be cleaned efficiently. Further, since the dust collecting filter 14 is added to the vent hole 11, the light emitting element 2a, the light receiving element 2b or the labyrinth wall 2c is contaminated by dust mixed in the air flowing into the smoke detection chamber from the vent hole 11. There is no fear. Here, the arrows in the figure indicate the flow of air.

  In addition, on the outer peripheral surface of the protective cover 4 of the detection unit 2, a gap is secured between the intake pipe of the cleaning device 30 and the detection unit 2 by, for example, forming protrusions in the vertical direction at equal intervals, and ventilation is performed. It is desirable not to be disturbed.

  5 (a) and 5 (b) are schematic longitudinal sectional views for explaining the operation of the closing member 13 in another example of the fire alarm according to the present invention. In particular, FIG. The state in which the intake hole 10 and the vent hole 11 are shielded, (b) shows the state in which the intake hole 10 and the vent hole 11 are released.

  The alarm device 1 accommodates a closing cover member 13 that shields and releases the intake hole 10 and the vent hole 11 in the space inside the head portion 1b. The closing member 13 is provided with a push-up operation unit 12, and this push-up operation unit 12 is directed from the opening of the main body cover 1 c provided closer to the detection unit 2 to the indoor space than the intake port 10. It is protruding. The closing member 13 is normally in a state where the intake hole 10 and the vent hole 11 are shielded by its own weight or an elastic spring (not shown). When 12 is pressed toward the space inside the head portion 1b, it moves upward. Therefore, the closing member 13 is also moved away from the intake hole 10 and the vent hole 11 to release these holes. Further, when the push of the push-up operation unit 12 is released, the closing member 13 returns to the original position and shields the intake hole 10 and the vent hole 11 again. The lid member 13 is constituted by a valve made of a thin rubber sheet or the like, and is bent by the air flow generated by the cleaning device 30 to release the intake hole or the vent hole. Alternatively, the pores or the air holes may be shielded by returning to the original shape. In addition, when the alarm device 1 is not used, a plug that is inserted into the intake hole 10 and shielded may be prepared.

  As described above, in the configuration in which the closing member 13 that shields at least one of the intake hole 10 and the ventilation hole 11 is accommodated in the space inside the head portion 1b, when the cleaning is not performed, the closing member 13 allows the intake hole and the passage to pass through. Since the air holes are shielded, no air flows from the indoor space through the air intake holes and the air holes during that time. Therefore, dust can be prevented from flowing into the detection unit 2 from the indoor space together with the air passing through the intake hole and the vent hole.

It is the perspective view which showed the whole external appearance of the fire alarm by this invention. 1 is an exploded view of a fire alarm according to the present invention. FIG. It is a schematic fracture view of the vertical direction of the fire alarm by this invention. It is a block diagram of the horizontal direction of a detection part. (A), (b) is a schematic fracture view in the vertical direction for explaining the operation of the closing member in another example of the fire alarm according to the present invention, and in particular, (a) is an intake hole and a vent hole. (B) shows a state where the intake holes and the vent holes are released.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fire alarm 1b Head part 1c Main body cover 2 Detection part 2a, 2b Smoke detection element 2c Labyrinth wall 10 Intake hole 11 Vent hole 13 Closure member 14 Dust collection filter

Claims (3)

In a residential fire alarm provided with a detection part in the head part configured by arranging a smoke detection element in a smoke detection room surrounded by a labyrinth wall,
An air intake hole is formed in the main body cover constituting the head portion, and a vent hole is formed in the detection portion, and an air passage communicating from the outside of the residential fire alarm to the smoke detection chamber is provided. A residential fire alarm with a structure. In claim 1,
A residential fire alarm provided with a dust collection filter in at least one of the intake hole and the vent hole. In claim 1 or 2,
The fire alarm for a house, wherein communication between the intake hole and the vent hole is blocked and permitted by a closing member.

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