Timed-stopping air sampler with long-term storage function

Abstract

The invention discloses a timed-stopping air sampler with a long-term storage function and belongs to air-quality detection devices of buildings. The timed-stopping air sampler is characterized by comprising a timed triggering base and a sampler main body arranged on the timed triggering base, wherein the sampler main body comprises a main-body case and two sealing devices which are same in structure and are symmetrically arranged in the main-body case; an automatic locking mechanism is arranged between the opposite side walls of the two sealing devices in the main-body case; an unlocking wedge block is arranged under a self-locking lever; and the position of a triggering rod of the timed triggering base corresponds to the unlocking wedge block. The timed-stopping air sampler disclosed by the invention has the advantages that the structure is simple, the independent package of the sampler main body is realized, possible pollution in the transportation and storage process is eliminated, and the storage and transportation period can be prolonged; the sampler main body is internally provided with two sets of sealing devices with same structures, and the sealing devices are used for eliminating errors caused by the fact that VOC emitted by the sealing devices and VOC generated in the storage and transportation environments penetrate through the sealing devices, so that the detection accuracy is greatly improved.

Description

Technical field: [0001] The invention relates to a time-closed air sampler capable of long-term storage, which belongs to building air quality detection devices. Background technique: [0002] Explanation of technical terms: [0003] VOC: Refers to various organic compounds with a boiling point not greater than 250°C under normal pressure, mainly including: benzene, toluene, xylene, ethylbenzene, styrene, etc. [0004] Air sampler: a type of auxiliary instrument that can collect or extract the measured volatile organic compounds (VOC) in the detected ambient air, and can detect the VOC concentration in the detected ambient air when used in conjunction with gas chromatography and other instruments . Air containers such as sampling bags and sampling air bags are not included (air samples collected by sampling bags must still be collected or extracted with an air sampler). [0005] Active air sampler: an auxiliary instrument that passes a certain volume of air samples throug...

AI Technical Summary

Problems solved by technology

That is to say, during the storage and transportation of the sampler, all the above-mentioned components and substances may become pollution sources emitting VOC. In the case of a long storage and transportation time, even a weak pollution source may affect the accuracy of the test results. sex and correctness;

[0015] 2) Since the materials used to manufacture the above-mentioned sealing device cannot achieve absolutely no VOC emission, and the sealing device is placed together with other components for a long time, it will inevitably be polluted by other components, so in the case of a long storage and transportation time, The VOC emitted by the sealing device itself should not be ignored

The timing passive air sampler mentioned above cannot eliminate the error caused by the VOC emitted by the sealing device itself

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