Harmful substance testing device with internal air circulation device

Abstract

The invention discloses a harmful substance testing device with an internal air circulation device. The harmful substance testing device comprises a cabin body which is provided with an internal air circulation device for simulating internal air circulation and is further provided with a perfume feeder for perfume testing, wherein the internal air circulation device can simulate the circulation system of internal air of a vehicle or a chamber so as to avoid the interference effects of the partial environmental factors of the part to a testing structure as well as improve the testing accuracy;and the perfume feeder can simulate the perception test of a human body to the environment after perfume is filled fed in the vehicle or the chamber. The testing device has diversified functions; thetesting device can not only realize gas sampling of the cabin body under the condition of ventilation/internal circulating air opening/internal circulating air closing and detection of release amountof volatile harmful gases such as formaldehyde and VOC (volatile organic compounds) volatilized from a tested object, but also simulate the perception test of the human body to the environment afterthe perfume is filled fed in the vehicle or the chamber; and the simulation environment is diversified, the simulation element is stronghigh in controllability, the interference effects of environmental factors or uncertain factors to test results are avoided, and the testing accuracy is high.

Description

technical field [0001] The invention belongs to the technical field of testing equipment for volatile organic compounds, and more specifically relates to a testing device for harmful substances with an internal air circulation device, which is used for the evaluation of fragrance, odor, VOC and other floating harmful substances in the test gas with the test. 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 followi...

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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] (4) The traditional system used to sample and detect volatile harmful gases such as formaldehyde and VOC cannot purify the gas in the test chamber first, and the residual formaldehyde, VOC and other volatile harmful gases in the gas in the test chamber will affect the detection the accuracy of

[0008] At the same time, the existing test device has a relatively single function, and it is impossible to test the human body's perception of the environment after simulating vehicles and installing fragrances indoors.

[0009] The interior of the vehicle or the indoor gas system itself has an internal gas circulation system and a ventilation system for internal and external ventilation; however, the existing test equipment does not have a setting for simulating the internal gas circulation system of the vehicle; nor does it simulate internal and external ventilation. System settings; have a certain impact on the test accuracy of simulating tests in these specific environments

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