Orifice-plate-type air duct structure of volatile organic compound detection system

Abstract

The invention discloses an orifice-plate-type air duct structure of a volatile organic compound detection system. The structure disclosed by the invention comprises a test bin and a test bin gate connected with the test bin, wherein the test bin is also internally provided with an air duct plate; the upper part of the air duct plate is provided with an air outlet orifice plate, and the lower partof the air duct plate is provided with an air return orifice plate; the air duct plate, the air outlet orifice plate, the air return orifice plate and the inner wall of the test bin form a first air duct; the first air duct is internally provided with at least one test bin circulating fan; the air outlet orifice plate, the inner wall of the test bin and the inner wall of the test bin gate are provided with air outlets and air return ports; and the air outlet orifice plate is provided with a right-angled, inclined or circular-arc-shaped air deflector. In the test bin, airflow blown down along the inner wall of the test bin is formed, thus adsorbed substances on the inner wall of the test bin are blown down so as to be continuously circulated in the test bin, so that the detected detection value of a sample obtained during sampling is more approximate to the actual value of the volatile organic compound in the test bin, the detection error is greatly reduced, and the detection precisionis improved.

Description

technical field [0001] The invention relates to a volatile organic compound detection system, and more specifically relates to an orifice-type air duct structure of the volatile organic compound detection system. technical background [0002] The volatile organic compound detection system is used to detect products containing volatile organic compounds to detect whether the volatile organic content of the product meets the requirements of relevant standards. During the detection process, the inner wall of the test chamber absorbs volatile organic compounds to form adsorbents. Moreover, there are dead corners on the inner wall of the test chamber, there are dead corners, and organic matter remains. When sampling and analyzing the content of volatile organic compounds, the samples obtained from the sampling port of the volatile organic compound detection system are used for detection. A large number of volatile organic compounds, resulting in the detection value obtained from ...

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Problems solved by technology

[0002] The volatile organic compound detection system is used to detect products containing volatile organic compounds to detect whether the volatile organic content of the product meets the requirements of relevant standards. During the detection process, the inner wall of the test chamber absorbs volatile organic compounds to form adsorbents. Moreover, there are dead corners on the inner wall of the test chamber, there are dead corners, and organic matter remains. When sampling and analyzing the content of volatile organic compounds, the samples obtained from the sampling port of the volatile organic compound detection system are used for detection. A large number of volatile organic compounds, resulting in the detection value obtained from the sample is lower than the actual value of the volatile organic compounds in the test chamber, the detection error is large, and it cannot effectively meet the high-precision detection needs. In order to strengthen the flow of gas in the test chamber, in the test A fan is installed in the chamber for stirring, but due to the requirement of the wind speed in the test chamber, the internal circulating air volume cannot be too large, so there are many adsorbents on the inner wall of the test chamber, which affects the detection accuracy

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