Testing device for odors, VOC and floating harmful substances

Abstract

The invention discloses a testing device for odors, VOC and floating harmful substances. The testing device comprises a constant temperature and / or constant humidity cleaning room, and at least one odor and VOC testing bin installed in the constant temperature and / or constant humidity cleaning room. Each odor and VOC testing bin comprises a bin body provided with at least one odor sampling port, wherein the bin body is connected with a gas compensation device which is used for carrying out gas volume compensation on the interior of the bin body in the gas sampling process to prevent pollution gas outside the bin body from entering the bin body due to a gas pressure difference, the gas compensation device is installed inside or outside the bin body, or is provided with a large opening to be fixed to the wall of the bin body in a sealed mode, and each odor and VOC testing bin further comprises an external circulation and filtering device arranged outside the bin body. The bin bodies can sample gas under gas exchange / sealing conditions, the release amount of formaldehyde, VOC and other volatile harmful gas volatilized in a tested object can be detected, and the interference influence on a testing result by the environment factor or other uncertain factors can be avoided, so that stability and testing precision are high.

Description

technical field [0001] The present invention relates to the technical field of testing equipment for volatile organic compounds, and more specifically relates to a testing device for odor, VOC and floating harmful substances, which is used for evaluating and testing odor, VOC and other floating harmful substances. Background technique [0002] Formaldehyde, volatile organic compounds (VOC) and other volatile harmful gases that exist in existing materials such as furniture and automotive supplies will cause harm to the human body if the concentration of volatile harmful gases exceeds a certain range. Reasonable collection of formaldehyde, VOC and other volatile harmful gases in mattresses is one of the important links of detection technology. [0003] At present, there are many systems for sampling and detecting volatile harmful gases such as formaldehyde and VOC in the industry, but the existing detection systems have the following shortcomings: [0004] (1) The detection s...

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Problems solved by technology

[0005] (2) During the test, the test chamber of the detection system did not discharge the original polluted air in the test chamber in advance, causing the volatile harmful gases such as formaldehyde and VOC volatilized from the measured object to mix with the original polluted air in the test chamber, Affected the accuracy of the test;

[0006] (3) When sampling, after the exhaust one-way valve on the test cabin of the detection system is opened, the gas in the test cabin will be discharged, causing the air pressure in the test cabin to decrease. At this time, the air in the surrounding environment will enter due to pressure difference. Inside the test cabin, which affects the accuracy of the test

[0007] In addition, the traditional system for sampling and detecting volatile harmful gases such as formaldehyde and VOC cannot first purify the gas in the test chamber, and the residual formaldehyde, VOC and other volatile harmful gases in the gas in the test chamber will affect the detection. precision

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