Continuous pressure variable sampling device and method for serpentine mass spectrometer

Abstract

The invention discloses a continuous pressure-variable sampling device for a serpentine mass spectrometer, which includes a housing and a mass spectrometer system. An inner plate with a serpentine groove on the upper surface is slidably installed inside the housing. The serpentine line The cross-sectional area of ​​the groove gradually increases from the inlet end to the outlet end. The gas outlet of the serpentine groove penetrates the side wall of the shell through the connecting pipeline and connects with the mass spectrometer system. The lower surface of the inner plate is supported by springs and bearings. The upper surface of the inner plate is closely attached to the inner upper wall surface of the outer shell with ventilation grooves. The air inlet of the air groove penetrates through the upper wall of the outer shell and is connected with the air inlet pipeline and the air inlet valve. The driving motor is driven by the screw mechanism. The inner plate slides in the shell; the invention has compact structure, good airtightness, and has the ability of continuous online sampling of the gas to be analyzed; through the serpentine layout and the sliding of the inner plate in the shell, the gas path of the serpentine line groove can be changed Length and cross-sectional area, so that it has the ability to sample and analyze a wide range of variable pressure gases with high precision.

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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