VOCs standard emitting sample for environmental cabin performance evaluation

Abstract

The invention relates to the technical field of gas-state VOCs preparation, in particular to a VOCs standard emitting sample for environmental cabin performance evaluation. The VOCs standard emittingsample for environmental cabin performance evaluation comprises a bottle body, an emitting control module and a bottle cap; the emitting control module comprises a barrier diaphragm, a fixed support and a fixed ring; the bottle body is filled with liquid-state VOCs; the fixed support is tubular; one end of the fixed support is connected with an opening of the bottle body, and the other end of thefixed support is connected with the bottle cap; a convex edge, inwards extending in the horizontal direction, is arranged on the inner wall of the fixed support; the barrier diaphragm is arranged on the upper surface of the convex edge; the fixed ring is positioned on the inner side of the fixed support; and the fixed ring is pressed on the barrier diaphragm. The barrier diaphragm is placed on theconvex edge on the inner side of the fixed support; the fixed ring is pressed on the upper surface of the barrier diaphragm to fix the barrier diaphragm; and through replacement of barrier diaphragmswith different apertures and model numbers, the VOCs emitting speed can be quantitatively controlled to prepare gas-state VOCs standard samples with different concentration ranges, and the defects ofcomplicated structure, single emitting speed and the like in traditional products are overcome.

Description

technical field [0001] The invention relates to the technical field of preparation of gaseous VOCs, in particular to a VOCs standard emission sample used for performance evaluation of an environmental chamber. Background technique [0002] Gaseous VOCs (volatile organic compounds) standard samples are widely used in the fields of VOCs detector calibration, environmental chamber performance evaluation and other fields. The preparation of gaseous VOCs standard samples usually includes bottled VOCs standard gas, diffusion tube, permeation tube, and continuous injection of VOCs standard solution, etc., using a special VOCs generator to generate a certain concentration of VOCs gas. Some of the preparation process needs to be heated, and some need to be diluted. There are problems such as complex preparation equipment and harsh preparation conditions, which are not conducive to the on-site calibration of detection instruments or the performance evaluation of the environmental cham...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problem that the existing VOCs emission samples can only prepare gaseous VOCs standard samples of a single fixed concentration, the emission rate is uncontrollable, and the application range is limited.

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