Serpentine mass spectrometer continuous variable-pressure sampling device and method

Abstract

The invention discloses a serpentine mass spectrometer continuous variable-pressure sampling device which comprises a shell and a mass spectrum system, wherein an inner plate with a serpentine grooveon the upper surface is slidably mounted in the shell, the cross-sectional area of the serpentine groove is gradually increased from an air inlet end to an air outlet end, an air outlet of the serpentine groove penetrates through the side wall of the shell through a connecting pipeline to be connected with the mass spectrum system, the lower surface of the inner plate is supported by a spring anda bearing, the upper surface of the inner plate is tightly attached to the surface of the inner upper wall of the shell with a vent groove, an air inlet of the vent groove penetrates through the upperwall of the shell to be connected with an air inlet pipeline and an air inlet valve, and a driving motor drives the inner plate to slide in the shell through a screw mechanism; the invention has compact structure and good air tightness, and has continuous online sampling capability for analyzed gas; and by a serpentine arrangement and the inner plate sliding within the shell, the length and cross-sectional area of the gas path of the serpentine groove can be changed, thereby having the capability of high-precision sampling analysis of large-range variable-pressure gas.

Description

technical field [0001] The invention belongs to the technical field of gas analysis, and in particular relates to a continuous pressure-variable sampling device and method for a serpentine mass spectrometer. Background technique [0002] Mass spectrometer, also known as mass spectrometer, is an instrument for analyzing and detecting different components in gases. It is a type of material separation and detection of material composition based on the principle that charged particles can be deflected in an electromagnetic field, according to the mass difference of material atoms, molecules or molecular fragments instrument. Mass spectrometer measurement technology has been widely used in pharmaceuticals, food, medicine, geology, steel production, vacuum system leak detection, environmental simulation, manned spaceflight and other industrial fields and scientific and technological research. all play an important role. [0003] The analysis chamber of the mass spectrometer must...

AI Technical Summary

Problems solved by technology

Most of the existing gas sampling devices (such as expansion method sampling) work intermittently and cannot carry out online continuous sampling of gas samples; while gas sampling devices capable of continuous sampling (such as needle valve throttling sampling) are usually only suitable for measuring In the working condition of a single fixed air pressure, it is difficult to continuously sample the working conditions with a wide range of pressure changes

For example, a needle valve is used as a fine-tuning valve, which can adjust the air flow, but limited to its own structure, the adjustable pressure range is limited, and the adjustable accuracy is not high enough

At present, with the continuous advancement of scientific research and industrial production technology, the requirements for gas analysis technology are also constantly increasing. It has become an urgent practical demand to realize high-precision online continuous monitoring of gas composition under the condition of large-scale changes in gas pressure. Existing mass spectrometer gas sampling methods and devices cannot meet the requirements of high-precision continuous sampling under the condition of gas pressure changes, which restricts the development and application of gas analysis mass spectrometers, and a new gas sampling device and method are urgently needed

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