Smell, VOC and floating harmful substance detection cabin with external circulation filtering device

Abstract

The invention discloses a smell, VOC and floating harmful substance detection cabin with an external circulation filtering device. The detection cabin comprises a constant temperature and / or constant humidity cabin body for providing a standard test environment, the cabin body is provided with at least one taste and odor sampling port, the cabin body is connected to a gas compensation device for gas volume compensation to the inside of the cabin body during gas sampling so as to prevent pollution gas outside the cabin body from entering the cabin body because of pressure difference, the gas compensation device is mounted inside or outside the cabin body, or the gas compensation device is equipped with a large port for sealing and fixation on the cabin wall of the cabin body. The detection cabin also includes the external circulation filtering device disposed outside the cabin body. The detection cabin provided by the invention can realize gas sampling under the condition of a ventilating / airtight cabin body, and detection of the release amount of formaldehyde, VOC and other volatile harmful gases volatilized from a detected objected, also can avoid the disturbing influence of environmental factors or other uncertain factors to the test result, and has the characteristics of good stability and high test precision.

Description

technical field [0001] The invention relates to the technical field of testing equipment for volatile organic compounds, and more specifically relates to a detection cabin for odor, VOC and floating harmful substances with an external circulation filter device. 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 system is tested in an ordinary environment, and enviro...

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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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