Smoke alarm capable of directionally eliminating condensation interference and use method

A smoke alarm and condensation technology, applied in alarms, fire alarms, instruments, etc., can solve the problems of weakening the anti-condensation effect, easy to damage the coating, and false alarms, so as to reduce material costs and avoid false alarms , long service life effect

Active Publication Date: 2020-08-14
深圳市高新投三江电子股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the actual use process, affected by the change of ambient temperature, condensation will occur in the optical dark room, and the condensation will produce a diffuse reflection effect on the light emitted by the transmitting tube, and the receiving tube will receive part of the diffusely reflected light, which will eventually lead to false alarms
In response to this problem, many manufacturers apply anti-fogging agents in the optical darkroom, but the anti-fogging agent is only effective for a period of time, and the dust in the optical darkroom is often cleaned during use, which is easy to damage the coating, further weakening the anti-condensation Effect

Method used

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  • Smoke alarm capable of directionally eliminating condensation interference and use method
  • Smoke alarm capable of directionally eliminating condensation interference and use method
  • Smoke alarm capable of directionally eliminating condensation interference and use method

Examples

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Effect test

Embodiment 1

[0025] An embodiment of the present invention provides a smoke alarm that can eliminate condensation interference in a direction, such as Figure 1-Figure 3 As shown, it includes a casing 10; a smoke detection chamber 11 is fixed inside the casing 10, and a condensation recognition chamber 12 is arranged side by side with the smoke detection chamber 11;

[0026] The side surface of the smoke detection chamber 11 is provided with a plurality of first smoke inlets 180; the first smoke inlets 180 communicate with the interior of the smoke detection chamber 11; the interior of the smoke detection chamber 11 is fixed with a launch tube 13 for emitting detection light obliquely upwards, The first receiving tube 14 that receives scattered light when the detection light is emitted by the smoke scattering emission tube 13, and the partition plate 15 that prevents the emitted detection light from the side of the emission tube 13 from impinging on the first receiving tube 14; the side sur...

Embodiment 2

[0040] The embodiment of the present invention provides a smoke alarm that can eliminate the interference of condensation in a direction. The same as the first embodiment will not be repeated, and the difference is:

[0041] Such as Figure 4 As shown, the inside of the condensation recognition compartment 12 is also fixed with a light shield 116 to prevent external light from directly hitting the second receiving tube 18 , so as to reduce the influence of external ambient light on the second receiving tube 18 .

[0042] Such as Figure 4 As shown, there are multiple sets of shading plates 116, and they are scattered and distributed; two sets of shading plates 116 adjacent in the vertical direction are distributed on both sides of the condensation recognition chamber 12, and multiple sets of shading plates 116 cooperate to form a circuitous path. , making it difficult for particles to enter the optically sensitive area of ​​the condensation recognition chamber 12 .

Embodiment 3

[0044] An embodiment of the present invention provides a method for using a smoke alarm, the method comprising the following steps:

[0045] Step S1: The emission tube emits the detection light.

[0046] Step S2: Obtain a first reverse current value corresponding to the first receiving tube, and a second reverse current value corresponding to the second receiving tube.

[0047] Step S3: If the first receiving tube and the second receiving tube have no reverse current change, the control board does not operate; if the first receiving tube and the second receiving tube have reverse current changes, and the first reverse current value and The difference between the second reverse current value is not greater than the preset trigger threshold, and the control board does not act; if both the first receiving tube and the second receiving tube have reverse current changes, and the first reverse current value and the second reverse current value If the difference between the current ...

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Abstract

The invention relates to a smoke alarm capable of directionally eliminating condensation interference and a use method. The smoke alarm comprises a shell; a smoke detection bin and a condensation recognition bin are fixedly arranged in the shell; the smoke detection bin is provided with a first smoke inlet; a transmitting tube, a first receiving tube and a partition plate are fixedly arranged in the smoke detection bin; the smoke detection bin is provided with a light emitting channel; the condensation recognition bin is provided with a light inlet channel and a light transmitting piece; a reflection column and a second receiving tube are fixedly arranged in the condensation recognition bin; the reflection column is used for reflecting the detection light emitted by the transmitting tube,and the second receiving tube is not in the emergent area of the light reflected by the reflection column; the second receiving tube is positioned at the middle upper part of the condensation recognition bin; the condensation recognition bin is provided with an air inlet; the shell is provided with a second smoke inlet; the shell is further provided with a control panel; the control panel is usedfor outputting an alarm signal when the difference between the reverse current value of the second receiving tube and the reverse current value of the first receiving tube is greater than a trigger threshold value. The condition of false alarm is effectively avoided.

Description

technical field [0001] The invention relates to the technical field of smoke alarms, more specifically, to a smoke alarm capable of directional elimination of condensation interference and a use method thereof. Background technique [0002] Photoelectric smoke detectors, with smoke as the main detection object, are suitable for places where there is a smoldering stage in the initial stage of a fire. Among them, the photosensitive element and the optical darkroom are the main components of the smoke detector. The photosensitive element is composed of several emitting tubes and receiving tubes. In a dark room, the smoke particles have a scattering effect on the light, thereby scattering part of the light emitted by the transmitting tube to the receiving tube, and the receiving tube receives the optical signal and transmits it to the central chip, thereby triggering an alarm. [0003] However, in actual use, due to the influence of ambient temperature changes, condensation wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B17/107
CPCG08B17/107
Inventor 高庆斌肖学波
Owner 深圳市高新投三江电子股份有限公司
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