JP4726591B2 - Fire alarm equipment - Google Patents

Description

  The present invention relates to a fire alarm equipment, and more particularly to its acoustic structure.

  Conventional fire alarm equipment, for example, a fire receiver, is provided with a sound generating source such as a speaker inside a box-shaped housing having a door, and an acoustic part including a plurality of acoustic holes on the door or the operation display panel. It is configured to be able to output a fire sound or the like when a fire occurs from the acoustic hole (see, for example, Patent Document 1).

JP-A-9-161187 (page 2-4, FIG. 1 and FIG. 5)

As described above, in the acoustic structure that outputs the sound from the speaker provided in the housing to the outside of the housing from the acoustic hole provided in the door, the size of the acoustic part formed from the plurality of acoustic holes is set to the size of the speaker. If it is smaller than the diameter, the sound pressure that appears outside the housing also tends to attenuate. The cause is that a part of the sound emitted from the speaker hits a part without a sound hole (the wall surface of the door) and is reflected and interferes with the sound that is originally output to the outside to be attenuated.
Therefore, in order to output the sound pressure of the speaker to the outside without being attenuated, the acoustic part is made equal to or larger than the diameter of the speaker so that there is as much as possible no shielding (inner wall of the door) in front of the speaker. There was a need. However, in that case, the area occupied by the acoustic part in the door depends on the aperture size of the speaker, which is a design limitation.
In addition, if a general-purpose speaker is used from the viewpoint of cost, the diameter of the speaker may be larger than that of the acoustic unit, and even in such a case, the sound pressure can be output without being attenuated. It is desirable to make it.

  Also, it is necessary to always turn on the fire receiver, but if you forget to turn on the power switch after turning off the power switch and checking the inside of the fire receiver, a fire may occur. It will cause serious damage such as oversight.

  Accordingly, an object of the present invention is to provide a device for fire alarm equipment that can output sound pressure without attenuating even when the aperture size of the speaker is larger than that of the acoustic part, and forgetting to turn on the power switch. Measures are taken to ensure prevention.

In order to solve the above-described problem, a fire alarm equipment according to the present invention includes an acoustic unit including a plurality of acoustic holes provided in a door body of a housing, and an acoustic unit attached to an inner surface of the door body. In a fire alarm equipment having a speaker having a larger diameter than the size, a cylindrical body having a diameter larger than the size of the acoustic part and smaller than the diameter of the speaker is provided between the speaker and the acoustic part. The sound output from the outer peripheral edge of the speaker is reflected on the outer peripheral surface of the cylindrical body so as not to interfere with the sound output to the cylindrical body by the speaker. It is a feature.

  Since the fire alarm equipment according to the present invention is configured as described above, the sound emitted from the vicinity of the outer peripheral portion of the speaker hits the outer peripheral surface of the cylindrical body and is reflected, and is emitted from the speaker inside the cylindrical body. It does not interfere with the sound output to the outside of the part. Accordingly, the sound pressure of the speaker can be output from the acoustic hole of the acoustic unit without being attenuated.

Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a fire alarm equipment according to the present invention. FIG. 2 is a front view of the fire alarm equipment (however, the display / operation unit is omitted), and FIG. 3 is a front view showing a state where the door of the fire alarm equipment is opened (however, speakers and the like are omitted). 4 is a perspective view showing a state in which a speaker or the like is attached to the door body of FIG. 3 obliquely from below, FIG. 5 is a sectional side view of the door body, and FIG. FIG. 7 is an explanatory view showing the relationship between the size of the speaker, the cylindrical body, and the acoustic part, and FIG. 8 shows a state in which the door of the fire alarm equipment is closed. It is sectional drawing.

A fire alarm equipment (for example, a fire receiver) in the present embodiment includes a main body 2 and a door body 3 that is coupled to the main body 2 by a hinge portion 4. As shown in FIG. 1, an operation / display unit 6 composed of a sheet substrate is affixed to the front side of the door 3, and the operation / display unit 6 is attached to the printed circuit board 13 in the housing 1 through the slit 31. Although not shown, they are connected by wiring. Since the operation unit and the display unit are integrally formed of a sheet substrate, it is possible to handle a single component at a time, and it is possible to reduce the number of components and the number of assembly steps as compared with the conventional case. Further, the casing 1 can be made thin, and the sheet substrate is only pasted on the door body 3, so that the number of assembling steps can be reduced.
The operation / display unit 6 has a lower left corner cut out in a square shape when viewed from the front, and a generally rectangular acoustic unit 7 is provided at this position, that is, at a substantially central position of the door body 2. . The acoustic part 7 is formed by arranging a plurality of elongated hole-like acoustic holes 8.

  As shown in FIGS. 3 and 5, a cylindrical tubular body 9 is formed integrally with the door body 3 on the back surface (inner surface) of the door body 3. As shown in FIG. 4, the speaker 10 is attached to a mounting base 11 having a mounting flange portion 10 a protruding around the cylindrical body 9 by screws. The back side of the speaker 10 is covered with a hood-like reflector 12, and the reflector 12 is also attached to the attachment base 11 with screws by an attachment portion extending from the hood-like portion.

Here, the diameter D of the speaker 10 is larger than the length L of the diagonal line of the acoustic part 7 as shown in FIGS. The diameter d of the cylindrical body 9 is larger than the diagonal length L of the acoustic unit 7 and smaller than the diameter D of the speaker 10. That is, the dimensional relationship is L <d <D.
With such a dimensional relationship, as shown in FIG. 6, the sound 21 emitted from the outer peripheral edge of the speaker 10 hits the outer peripheral surface of the cylindrical body 9 and is reflected to be output to the outside of the speaker 10. There is no interference with the sound 20. As a result, most of the sound 20 emitted from the speaker 10 is output to the outside through the plurality of acoustic holes 8 of the acoustic unit 7 without being attenuated.

  Therefore, even if the speaker 10 having a larger diameter than the sound unit 7 is employed, the cylindrical body 9 having a diameter d larger than the sound unit 7 and smaller than the diameter D of the speaker 10 is interposed between the speaker 10 and the sound unit 7. By doing so, attenuation of the sound pressure of the speaker 10 can be effectively suppressed, and a versatile and inexpensive speaker 10 can be employed without being restricted by the design of the acoustic unit 7.

  Further, as shown in FIG. 5 and the like, in the speaker 10, the cone holding portion 10c is covered with the hood-like reflector 12 by fitting the reflector 12 to the magnet portion 10b. Since the cone holding part 10c of the speaker 10 is usually provided with a plurality of openings 10d (FIG. 7), the sound leaked from the opening 10d is reflected forward by the reflector 12 to increase the volume. can do. That is, even if the volume of the speaker 10 is set to a small value, it is possible to suppress the sound pressure attenuation and output a large volume.

Further, as shown in FIGS. 8 and 4, a control circuit board for controlling the operation of the fire alarm equipment, that is, a printed board 13 is built in the main body 2. A power switch 14 is mounted. A projection 15 for turning on the power switch 14 is erected from the back surface of the reflector 12.
Therefore, when the door 3 is opened for inspection or the like, the operator can turn on and off the power switch 14. However, even if the power switch 14 is forgotten to be turned on after the inspection or the like, When closed, the protrusion 15 pushes the switch lever of the power switch 14 to turn it on. For this reason, it is possible to reliably prevent the power switch 14 from being forgotten. In particular, since the reflector 12 is located on the main body 2 side (power switch 14 side) with respect to the door 3, it is assumed that the protrusion 12 has a protrusion compared to a case where a protrusion having a similar function is provided on the door 3. No. 15 is short and there is no risk of breakage.

As described above, the fire alarm equipment of the present embodiment has the size of the acoustic unit 7 between the acoustic unit 7 including the plurality of acoustic holes 8 provided in the door body 3 and the speaker 10, that is, Since the cylindrical body 9 having a diameter d larger than the diagonal length L of the area and smaller than the diameter D of the speaker 10 is interposed, the diameter of the speaker 10 is larger than that of the acoustic unit 7. Can be output without attenuating the sound pressure. Therefore, it is possible to employ a versatile and inexpensive speaker without being restricted by the design of the acoustic unit 7.
As such a fire alarm equipment, in addition to a fire receiver, it can be applied to an equipment having an acoustic unit such as an interlock control panel, a fire indicator, and a fire alarm.

  Also, by providing the hood-like reflector 12 on the back side of the speaker 10, the sound leaking from the opening 10d provided in the cone holding portion 10c of the speaker 10 can be reflected forward, so that the volume of the sound is low. Even at the setting, sound volume attenuation can be suppressed and a high volume can be output.

  Further, the reflector 12 is provided with a protrusion 15, and when the door 3 is closed, the power switch 14 mounted on the printed circuit board 13 is turned on by the protrusion 15. Can be prevented.

In addition, this invention is not limited to the above-mentioned embodiment. For example, the shape of the acoustic hole 8 is not limited to a long hole, and may be a circle, an ellipse, or other shapes. Further, the shape (envelope shape) of the acoustic portion 7 including the plurality of acoustic holes 8 can be an arbitrary shape such as a circle or an ellipse in addition to a square shape. Further, the cylindrical body 9 and the speaker 10 can be circular, rectangular or elliptical.
The power switch 14 is a contact type, but may be a non-contact type such as a proximity switch.

The perspective view of the apparatus for fire alarm facilities which shows one Embodiment of this invention. Front view of this fire alarm equipment (however, the display / operation unit is omitted). The front view which shows the state (however, a speaker etc. are abbreviate | omitted) which opened the door body of this fire alarm equipment. The perspective view which shows the state which looked at the state which attached the speaker etc. to the door body of FIG. 3 diagonally up from the bottom. The cross-sectional side view of a door body. Sectional drawing for demonstrating the suppression effect of the sound pressure attenuation | damping of a speaker. Explanatory drawing which shows the relationship between the magnitude | size of a speaker, a cylindrical body, and an acoustic part. Sectional drawing which shows the state which closed the door body of this fire alarm equipment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case, 2 main body, 3 door body, 7 acoustic part, 8 acoustic hole, 9 cylindrical body, 10 speaker, 12 reflector, 13 printed circuit board, 14 power switch, 15 protrusion.

Claims (1)

In an apparatus for fire alarm equipment comprising an acoustic part composed of a plurality of acoustic holes provided in a door body of a housing, and a speaker attached to the inner surface of the door body and having a diameter larger than the size of the acoustic part,
A cylindrical body larger than the size of the acoustic unit and smaller than the diameter of the speaker is provided between the speaker and the acoustic unit ,
A fire characterized in that the sound output from the outer peripheral edge of the speaker is reflected against the outer peripheral surface of the cylindrical body so as not to interfere with the sound output into the cylindrical body by the speaker. Notification facility equipment.

Images