Vacuum keeper for a gas chromatography-mass spectrometer
A technology of vacuum maintenance and gas chromatography, which is applied in the field of gas chromatography-mass spectrometry, can solve the problems of chromatographic separation, etc., and achieve the effects of small dead volume, good sealing degree and simple structure
Inactive Publication Date: 2016-03-02
DALIAN UNIV OF TECH
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Problems solved by technology
This requires the device to have as small a dead volume as possible, otherwise the chromatographic resolution will decrease
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[0021] A vacuum holding device in a gas chromatography-mass spectrometer, comprising a threaded interface 1, a cavity 2, and a cylindrical switching valve 3 or a conical switching valve 4; The ends are provided with threaded interfaces, which are respectively used to connect the chromatographic end and the mass spectrometer end. Inside the two threaded interfaces are respectively a stepped cavity 2; It is level with the lower end face of the threaded interface; the lower part of the switching valve and the cavity 2 are provided with a communicating hole 5, and the diameter of the communicating hole 5 is 0.1-2.0 mm; by rotating the switching valve, the communicating hole 5 and the cavity 2 at both ends can be made horizontal Connected or vertically sealed; the top of the switching valve is located outside the convex cylindrical structure, and a Teflon sealing ring 6 and a nut 7 are sequentially installed on it to seal the cavity. This vacuum holding device has a dead volume as ...
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Abstract
The present invention relates to a vacuum keeper for a gas chromatography-mass spectrometer. The vacuum keeper has an overall convex cylindrical structure; threaded fittings are arranged at two ends of the convex cylindrical structure to connect a chromatography end and a mass spectrometry end respectively; two threaded fittings are provided with cavities with stepped internal shape; the center of the convex cylindrical structure is provided with a rotatable switching valve; the bottom end of the switching valve is levelling with the lower ends of the threaded fittings; a communication hole with diameter of 0.1-2.0 mm is arranged at the position, levelling with the cavities, on the lower part of the switching valve; by rotating the switching valve, the communication hole can form a horizontal communication or vertical sealing relation with the cavities at two ends; and the top of the switching valve is located outside the convex cylindrical structure, and is provided with a PTFE seal ring and a nut in turn for sealing the cavities. The vacuum keeper has the characteristics of small dead volume, simple structure and reliable sealing, can achieve related operations, such as replacement of the chromatography column and maintenance of chromatography inlet, without venting the mass spectrometer, greatly reduces maintenance time for the spectrometer and improves the efficiency of the spectrometer.
Description
technical field [0001] The invention relates to a gas chromatography-mass spectrometry combined technology, in particular to a vacuum holding device in a gas chromatography-mass spectrometry instrument. Background technique [0002] Gas chromatography-mass spectrometry (GC-MS) plays an important role in the qualitative and quantitative analysis of volatile and semi-volatile organic pollutants. For samples with complex components, the separation of complex components is achieved by selecting a chromatographic column and changing the temperature program in the gas chromatography part, and the separated components are analyzed by mass spectrometry. One end of the chromatographic column is connected to the injection port, and the other end is connected to the high vacuum mass spectrometer. Mass spectrum needs to be maintained at 10 -5 Tor (for electron bombardment ionization sources, EI) and 10 -4 A vacuum above Tor (for chemical ionization sources, CI) can effectively ionize...
Claims
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Login to View More IPC IPC(8): G01N30/72
CPCG01N30/7206G01N2030/025
Inventor 谢晴陈景文赵洪霞姜菁秋张亚南
Owner DALIAN UNIV OF TECH