Continuous pressure variable sampling device and method for a helical mass spectrometer

Abstract

The invention discloses a continuous pressure-variable sampling device for a helical mass spectrometer, which comprises a cylindrical shell and a mass spectrometer system. An inner cylinder with a helical linear groove on the outer surface is slidably installed inside the shell. The cross-sectional area of ​​the helical linear groove gradually increases from the air inlet end to the air outlet end. The outer surface of the inner cylinder is closely attached to the inner wall surface of the cylindrical shell. The air inlet chamber, the outlet end of the helical linear groove is provided with an air outlet passage that runs through the wall of the inner cylinder near the end of the mass spectrometer system, and the connecting pipeline penetrates through the side wall of the shell to connect with the mass spectrometer system, and the drive motor is driven by a screw mechanism. The inner cylinder slides in the outer casing; the invention has a compact structure and has the ability of continuous online sampling of the gas to be analyzed; when the inner cylinder slides in the outer casing, the length and cross-sectional area of ​​the gas path of the helical linear groove are changed, thereby having the ability to Capable of high-precision sampling and analysis of a wide range of variable pressure gases.

Description

Technical field [0001] The invention belongs to the technical field of gas analysis, and in particular relates to a continuous variable pressure sampling device and method for a spiral mass spectrometer. Background technique [0002] Mass spectrometer, also known as mass spectrometer, is an instrument that analyzes and detects different components in gas. It is a type of material composition that separates and detects material composition based on the principle that charged particles can be deflected in an electromagnetic field, according to the difference in mass 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 aerospace and other industrial fields and scientific and technological research. It is important for the development of modern technology and the construction of national ...

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

Images