Sealed cabin sampling system

Abstract

The invention provides a sealed cabin sampling system, which comprises a clean cabin body which is used for storing a to-be-detected object, keeping constant temperature and / or constant humidity and is in a closed state, and a compensation bag which can be expanded and is used for compensating the volume of gas in the clean cabin body, the clean cabin body is provided with an exhaust sampling port used for exhausting to-be-detected gas in the clean cabin body and a gas supplementing port used for circulating external gas, the compensation bag goes deep into the clean cabin body, the compensation bag is communicated with the gas supplementing port through a gas supplementing pipeline, and the compensation bag can perform volume compensation on the interior of the cabin body in the gas sampling and extracting process, so that pollution gas outside the cabin body can be prevented from entering the cabin body due to air pressure difference, the influence of environmental factors or other uncertain factors on a test result is avoided, the compensation bag goes deep into the clean cabin body, in the gas sampling, extracting and expanding process, the gas in the clean cabin body can be disturbed in a large range, the volatile organic compounds in the clean cabin body are distributed more uniformly, and the precision of a measurement result is ensured.

Description

[0001] Parent case: Invention name - a closed chamber sampling system; application number - 201610508705.3; publication date - September 28, 2016; publication number - CN105973652A; application date - June 30, 2016; applicant - Dongguan Shengwei Electromechanical Equipment Technology Co., Ltd. technical field [0002] The invention relates to the technical field of testing equipment for volatile organic compounds, and more specifically, relates to a sampling system for an airtight cabin. Background technique [0003] 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. [0004] At present, there are many systems for sampling an...

AI Technical Summary

Problems solved by technology

[0006] (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, affect the accuracy of the test;

[0007] (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

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