Atmospheric pressure ion source exhaust device of mass spectrometer

Abstract

The invention discloses an atmospheric pressure ion source exhaust device of a mass spectrometer, which belongs to the field of mass spectrometers and comprises an ion source chamber, an exhaust port communicated with the ion source chamber, a vacuum generator, an electronic pressure regulating valve, a controller and a pressure sensor, and the vacuum generator is mounted between the exhaust port and the ion source chamber and connected with the electronic pressure regulating valve. The controller is electrically connected with the electronic pressure regulating valve and the pressure sensor, the controller monitors the pressure in the ion source chamber through the pressure sensor, and when the pressure in the ion source chamber changes, the controller regulates the pressure of an outlet of the electronic pressure regulating valve so as to change the vacuum degree of a negative pressure opening of the vacuum generator, so that the exhaust rate of the exhaust opening is changed; the internal pressure of the ion source chamber is constant, and the signal stability of the mass spectrometer is ensured.

Description

technical field [0001] The invention relates to the technical field of mass spectrometers, in particular to an exhaust device for an atmospheric pressure ion source of a mass spectrometer. Background technique [0002] The ion source is one of the core components of a mass spectrometer. The ion source has two main functions: ionizing the analyzed substance into ions; extracting, accelerating and focusing the ions. Different types of ion sources have different methods of generating ions. Atmospheric pressure ion sources are one of many ion sources. Ions are generated at or near atmospheric pressure, of which electrospray ion sources and atmospheric pressure chemical ionization sources are the most common. Atmospheric pressure ion source. When the sample enters the ion source and is ionized, the sample will not be fully utilized. At the same time, during the ionization process, auxiliary gas and heated atomizing gas are injected into the ion source chamber to stabilize the sp...

AI Technical Summary

Problems solved by technology

For different analysis samples, the auxiliary gas and atomizing gas injected into the ion source are different, but the exhaust fan is often used in the common source exhaust device of mass spectrometer at present. The change of the flow rate in the ion source chamber of the gas will cause the instability of the pressure of the ion source chamber, resulting in the instability of the ionization process, which in turn leads to the instability of the mass spectrometer signal

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