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Fire alarm device

A fire alarm and sound technology, applied in fire alarms, alarms, and fire alarms that rely on smoke/gas effects, etc., can solve problems such as inability to ensure sound pressure, and achieve the effect of reducing the diameter

Active Publication Date: 2012-12-12
NOHMI BOSAI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since part of the alarm sound emitted from the sound unit hits the back of the dark box and propagates inside the box, the specified sound pressure cannot be ensured.

Method used

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Embodiment Construction

[0031] The best implementation mode of the fire alarm of the present invention will be described below using the accompanying drawings. In addition, in the following description, the side attached to a ceiling etc. is called the back side, and the side opposite to the back side is called the front side. And, the direction parallel to a ceiling etc. is called a horizontal direction.

[0032] figure 1 It is a plan view which shows the state which removed the mounting base and the main body of the fire alarm of this invention. figure 2 is along figure 1 Cutaway view of the fire alarm in direction A-A. image 3 It is a top view of the protective cover of the fire alarm. Figure 4 It is a top view of the dark box, printed circuit board and loudspeaker of the fire alarm. Figure 5 It is a plan view seen from the main body side of the fire alarm. Figure 6 is along Figure 5 The cross-sectional view of the B-B direction.

[0033] The fire alarm 1 of the present invention has...

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PUM

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Abstract

The invention provides a fire alarm device which has small box body diameter and large alarm sound pressure. The fire alarm device comprises a protecting cover having a dark box placing part which prostrudes to one side of the front into a cylinder shape and is provided with a smoke flow inlet window at the side and an audio component placing part which is formed with an audio hole outside the dark box placing part; a dark box which is placed in the dark box placing part; an audio component which is placed in the audio component placing part; a printed circuit board which is arranged at one side of the back of the dark box; a main body which can fix the dark box, the audio component and the printed circuit board between the main body and the protecting cover; wherein, the audio component is arranged at one side of the back of the dark box, a first rib part is arranged from one side of the back on the protecting cover, the first rib part is connected with an outer edge part of the audio component which is not overlapped with the dark box, a second rib part is arranged at one side of the back of the dark box, and the second rib part can enclose the peripheral of the audio component which is overlapped with the dark box.

Description

technical field [0001] The present invention relates to a fire alarm that integrally includes a sensor unit and an alarm unit. Background technique [0002] In a conventional fire alarm, a sensor unit for detecting a fire and an alarm unit for issuing an alarm when a fire is detected by the sensor unit are provided inside a flat box-shaped main body. The dark box of the sensor unit and the acoustic member of the alarm unit are arranged inside the main body so as not to overlap (for example, refer to Japanese Patent Laid-Open Publication No. 2004-362537). [0003] However, in the conventional fire alarm, since the dark box and the acoustic components are arranged so as not to overlap, the diameter of the box is increased, making it inconvenient to handle, and it is conspicuous when installed on the ceiling or the like, detracting from the beauty of the room. Therefore, it is conceivable to place a part of the acoustic member on the back side of the dark box and place the aco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G08B17/10G08B3/10
CPCG08B3/06G08B17/00
Inventor 冨田寿幸
Owner NOHMI BOSAI LTD