Helical mass spectrometer continuous pressure-varying sampling device and sampling method

Abstract

The invention discloses a helical mass spectrometer continuous pressure-varying sampling device, comprising a cylindrical housing and a mass spectrometry system, wherein the interior of the housing isslidably provided with an inner cylinder having a helical line groove on the outer surface. The helical line groove has gradually increased cross-sectional area from a gas inlet to a gas outlet. Theouter surface of the inner cylinder closely fits with the inner wall surface of the cylindrical housing, and the central circumference on the inner wall surface of the cylindrical housing is providedwith an annular gas inlet chamber. The gas outlet of the helical line groove is equipped with a gas outlet channel that penetrates through a cylinder wall of the inner cylinder near the mass spectrometry system, and penetrates through the side wall of the housing via a pipeline to connect with the mass spectrometry system. A driving motor drives the inner cylinder to slide in the housing through ascrew mechanism. The helical mass spectrometer continuous pressure-varying sampling device has compact structure and the capability of continuously sampling the gas to be analyzed online; when the inner cylinder slides in the housing, the length of the gas channel and cross-sectional area for the helical line groove are changed, so that the helical mass spectrometer continuous pressure-varying sampling device has high-precision sampling analysis ability to a wide range of pressure-varying 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 helical 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 wo...

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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