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A test device and method for evaluating the dirty function of a point-type smoke detector

A technology for fire detectors and point-type smoke sensing, which is applied to instruments, alarms, etc., and can solve the problems of inability to detect smoke, fire detectors, dust pollution tests, and control of the stability of dust concentration.

Active Publication Date: 2022-06-28
SHENYANG FIRE RES INST OF MEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These test methods are not suitable for testing false alarms or operating point drift caused by dust interference of fire detectors, so these test methods have not been used to test fire detectors in the field of fire detection and alarm
In addition, the dust test chamber specified in GB / T2423.37-2006 / IEC60068-2-68:1994 "Environmental Tests for Electrical and Electronic Products" cannot control the stability of dust concentration, so it cannot be used for quantitative smoke detectors Dust Pollution Test

Method used

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  • A test device and method for evaluating the dirty function of a point-type smoke detector
  • A test device and method for evaluating the dirty function of a point-type smoke detector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Using the above-mentioned test device for evaluating the dirty function of a point-type smoke detector, and according to the test method of the present invention, the rationality of setting the point-type point-type smoke detector for reporting dirty points is tested and evaluated:

[0032] (1) Set the test conditions: the initial dust concentration in the test box: 600mg / m 3 ; The temperature is 23±5℃; the relative humidity is <25%; the airflow velocity around the point-type smoke detector is 0.5±0.1m / s; the initial duration of the test: 1h;

[0033] (2) Before the test, the response thresholds of two samples A and B of this type of point-type smoke detector were detected by the TureTest point-type smoke detector threshold detection equipment of NoClimb Company in the United Kingdom, and the response thresholds were 0.39dB / m and 0.37dB respectively. / m, and record it;

[0034] (3) Install the two point-type smoke detector samples A and B that have been initially measu...

Embodiment 2

[0040] Using the above-mentioned test device for evaluating the dirty reporting function of the point-type smoke detector, according to the test method of the present invention, the rationality of setting the point-type smoke detector for reporting dirty points is tested and evaluated:

[0041] (1) Set the test conditions: the initial dust concentration in the test box: 600mg / m 3; The temperature is 23±5℃; the relative humidity is <25%; the airflow velocity around the point-type smoke detector is 0.5±0.1m / s; the initial duration of the test: 1h;

[0042] (2) Before the test, the response thresholds of two point-type smoke detector samples C and D of this type were detected by the TureTest point-type smoke detector threshold detection equipment of British NoClimb Company, and the response thresholds were 0.32dB / m and 0.34dB respectively. / m, and record it;

[0043] (3) Install the above-mentioned two point-type smoke detector samples C and D after initial measurement on the de...

Embodiment 3

[0049] Using the above-mentioned test device for evaluating the dirty reporting function of the point-type smoke detector, according to the test method of the present invention, the rationality of the third type of point-type smoke detector reporting dirty point setting is tested and evaluated:

[0050] (1) Set the test conditions: the initial dust concentration in the test box: 600mg / m 3 ; The temperature is 23±5℃; the relative humidity is <25%; the airflow velocity around the point-type smoke detector is 0.5±0.1m / s; the initial duration of the test: 1h;

[0051] (2) Before the test, using the TureTest point-type smoke detector threshold detection equipment of British NoClimb company to detect the response thresholds of two point-type smoke detector samples E and F of this type are 0.36dB / m and 0.32dB respectively / m, and record it;

[0052] (3) Install the two point-type smoke detector samples E and F that have been initially measured on the detector fixing plate in the tes...

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Abstract

The invention provides a test device for evaluating the dirty function of fire detectors, which is composed of a test box, a dust generating device and a test parameter monitoring device. Two fire detectors can be fixed on the fixing plate in the test box. The wall is provided with a dust filling port to connect with the dust generating device, and the test parameter monitoring device includes a dust concentration meter, a temperature and humidity meter and an anemometer. The present invention also provides a test method for evaluating and reporting the dirty function of the above-mentioned device: set the test conditions, measure the response threshold of the detector sample and put it into the test box, then carry out the dust pollution of the detector, and stop after the duration reaches the set value Dust injection, when the dust concentration drops to the level of the atmospheric environment, observe the state of the detector until the actual increment of the detector’s dirty function judgment parameter reaches 90% to 100% of the design increment, and then record the response threshold of the detector. The ratio of the response threshold before and after the test is used to evaluate its dirty reporting function, which provides a basis for the research and application of the detector.

Description

Technical field: [0001] The invention relates to the performance detection of fire detectors, in particular to a test device and a test method for evaluating the dirty reporting function of point-type smoke fire detectors. Background technique: [0002] Point-type smoke detectors are the most widely used fire detectors at present. However, in actual projects, it was found that point-type smoke detectors that have been used for more than 3 years have not been cleaned in time after the detection cavity is polluted by dust. The detection performance is affected, and some are even shielded due to frequent false alarms, resulting in loss of protection of the detector installation position, which has a great potential safety hazard. The national standard GB29837-2013 "Maintenance and Scrap of Fire Detection and Alarm Products" stipulates the cleaning and maintenance cycle of the detector, requiring that the detector with the function of reporting dirty should be cleaned and mainta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G08B29/14
CPCG08B29/145
Inventor 梅志斌于春雨董文辉张曦龚溥
Owner SHENYANG FIRE RES INST OF MEM