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Fire differentiating method, fire alarm and fire receiver

A discrimination method and fire technology, which are applied to fire alarms, fire alarms that rely on the effect of smoke/gas, and alarms, etc., can solve the problems of slow alarm output and difficulty in reaching a certain level of the counter, so that the alarm output will not be delayed. Effect

Inactive Publication Date: 2008-06-04
MATSUSHITA ELECTRIC WORKS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the configuration of Patent Document 1, it is difficult for the value of the counter to reach a certain value or more for the change of the smoke concentration that rapidly increases and quickly returns to the original state when cooking smoke or cigarette smoke, etc., so although it is estimated There is a certain degree of effect, but in the early stage of a fire where the smoke density increases slowly, there is a problem that the alarm output is delayed because the counter value does not reach the threshold

Method used

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  • Fire differentiating method, fire alarm and fire receiver
  • Fire differentiating method, fire alarm and fire receiver
  • Fire differentiating method, fire alarm and fire receiver

Examples

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Embodiment 1

[0019] Fig. 1 is a functional block diagram illustrating an example in which the present invention is applied to a fire alarm. The fire alarm 1 is provided with: a smoke sensor 1a which detects smoke generated by a fire etc. and outputs the smoke concentration V thereof; an A / D conversion mechanism 1b , which digitizes the smoke concentration V output by the smoke sensor 1a; the filter mechanism 1c, which performs low-pass filter processing on the digitized smoke concentration V; the comparison mechanism 1d, which compares the processed filter value F with the specified threshold value Ft The fire is judged by comparison; the output mechanism 1e, which outputs an alarm when it is judged as a fire; the storage mechanism 1f, which stores various set values; the operating mechanism 1g, which is used to stop the alarm.

[0020] The filter mechanism 1c has a register 1h that holds the filtered value F after processing, that is, its own output value. As a low-pass filter process, it ...

Embodiment 2

[0036] 5 is a functional block diagram illustrating an example of applying the present invention to a system composed of a fire receiver and a detector. A detection circuit N connected to a plurality of detectors 10 having smoke sensors is derived from the fire receiver 2 . Such a configuration can be realized by, for example, a home security system having a fire receiving function or the like. Among the components in this functional block diagram, the same reference numerals are assigned to the same parts as those in the above-mentioned embodiments, and redundant descriptions will be omitted.

[0037] The fire receiver 2 shown in the figure includes: a communication mechanism 2a for communicating with the detector 10, a filter mechanism 1c for performing low-pass filter processing on the smoke density V received from the detector 10, and a predetermined Threshold value Ft compares and judges the comparing mechanism 1d of fire, when judging as fire, outputs the output mechanis...

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Abstract

The invention provides a fire discrimination method, a fire alarm and a fire receiver. When the density of smoke such as cooking smoke or cigarette smoke changes rapidly, it exhibits noise resistance, and when the smoke density increases slowly during a fire, the alarm output will not be sluggish. In the method of judging a fire in a fire alarm or a fire receiver, the smoke density is digitized, and low-pass filtering is performed, and the filtered value after this processing is compared with a predetermined threshold to judge a fire.

Description

technical field [0001] The present invention relates to a method for judging a fire that is applicable to a fire alarm and a fire receiver that have a smoke sensor and output an alarm when it is judged as a fire. Background technique [0002] As a conventional example of a method for judging a fire based on smoke density, the following Patent Document 1 describes a smoke detector that counts up when the smoke density is above a threshold, and counts up when the smoke density does not exceed the threshold. Decrement counting action, and when the value of the counter reaches the preset maximum or minimum value, fire alarm or fire recovery is performed, among which, the counting range during the counting up action and the counting during the counting down action can be At least one of the amplitudes can be set variably, thereby improving noise resistance. [0003] Patent Document 1: Japanese Unexamined Patent Publication No. 2004-62299 [0004] However, in the configuration o...

Claims

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Application Information

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IPC IPC(8): G08B17/10G08B17/00
Inventor 森田阳介小川靖洋
Owner MATSUSHITA ELECTRIC WORKS LTD
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