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Sounding chamber structure of a smoke alarm

A smoke alarm and cavity structure technology, applied in the field of alarms, can solve the problems of large volume, low sound level, and structure that does not conform to Holm Hertz's law in the front sound cavity 7

Active Publication Date: 2022-03-22
宁波东方电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The design feature of the "peripheral type" is that the volume of the front sound cavity 7 of the product is relatively large, resulting in a wide frequency response range, but the sound level of the product is low, and its structure does not conform to Holmhertz's law

Method used

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  • Sounding chamber structure of a smoke alarm
  • Sounding chamber structure of a smoke alarm
  • Sounding chamber structure of a smoke alarm

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Embodiment Construction

[0029] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the following embodiments are combined with the accompanying drawings to elaborate on the present invention.

[0030] image 3 The sound chamber structure of a smoke alarm of the present invention has a side sectional view of three pins, please combine image 3 As shown, a sound cavity structure of a preferred smoke alarm is shown, including a casing 1, a bottom plate 2 and a front cover shell 3, the bottom plate 2 is arranged at one end of the casing 1, and the front cover shell 3 It is arranged at the other end of the housing 1 , and the front cover 3 is provided with a sound emitting hole 32 . An annular platform 11 is also provided in the housing 1, there is a gap between the annular platform 11 and the front cover shell 3, and the hole of the annular platform 11 is provided with a protruding ring 12 facing the bottom plate 2, so A piezo...

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Abstract

The invention discloses a sounding cavity structure of a smoke alarm, which comprises a casing and a bottom plate arranged at one end of the casing. An annular platform is provided, and the hole of the annular platform is provided with a protruding ring facing the bottom plate. The piezoelectric sheet, the annular platform and the protruding ring separate the sound cavity structure into a front sound cavity communicated with the atmosphere and a sealed rear cavity. cavity. In the present invention, a front cover shell with a certain gap with the annular platform is arranged on the outer casing, instead of the design in the prior art that directly uses the annular platform as the front cover shell, so that the front cover can be reduced when the overall thickness of the sounding cavity is reduced. The volume of the sound cavity remains unchanged, thereby reducing the impact on the sound effect of the structure of the sound cavity.

Description

technical field [0001] The invention relates to the technical field of alarms, in particular to a sounding chamber structure of a smoke alarm. Background technique [0002] figure 1 It is a structural schematic diagram of a "pitch circle" sounding cavity in the prior art; figure 2 It is a structural schematic diagram of a "peripheral" sound emitting cavity in the prior art. see figure 1 and figure 2 As shown, there are two types of sounding cavity structures of existing piezoelectric alarms, which are respectively "pitch circle type" and "peripheral type". Small, resulting in a narrow frequency response range, the advantage is that it has a higher sound level, and the structure conforms to Holmhertz's law. The design feature of the "peripheral type" is that the volume of the front sound cavity 7 of the product is relatively large, resulting in a wide frequency response range, but the sound level of the product is low, and its structure does not conform to Holmhertz's ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R9/06H04R9/02
CPCH04R9/02H04R9/06H04R2400/11
Inventor 王建成
Owner 宁波东方电子有限公司