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A nozzle assembly for a miniature hydrogen flame ionization detector

A detector and hydrogen flame technology, used in instruments, measuring devices, scientific instruments, etc., can solve the problem of unreliable detector sealing, and achieve good electrical insulation, simple sealing structure, high temperature resistance insulation and excellent sealing performance. Effect

Active Publication Date: 2021-08-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to improve the deficiencies of the existing technology, the present invention provides a novel nozzle assembly of a miniature hydrogen flame ionization detector, which can effectively solve the problem of unreliable sealing of the detector under repeated high and low temperature cycles, and improve the sealing reliability of the nozzle area

Method used

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  • A nozzle assembly for a miniature hydrogen flame ionization detector
  • A nozzle assembly for a miniature hydrogen flame ionization detector
  • A nozzle assembly for a miniature hydrogen flame ionization detector

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Embodiment 1

[0040] The μ-FID was developed using a new nozzle assembly, and the schematic diagram of the nozzle section is shown in figure 1 As shown, it consists of a nozzle 1, a guide tube 2, an upper seal 3, a sleeve 4, a lower seal 5, an upper pressure body 6, a lower pressure body 7, and a detector body 8. The material of the nozzle 1, the guide tube 2 and the casing 4 is stainless steel, and the material of the upper seal 3 and the lower seal 5 is high temperature resistant all-aromatic polyimide. The inner diameter of the nozzle 1 is 0.18mm, the outer diameter is 0.38mm, the length of the nozzle 1 extending into the guide pipe 2 is 3mm, and then it is fixed by brazing at the seam. The inner diameter of the guide tube 2 is 0.5 mm, the outer diameter is 1.6 mm, and the length is 17 mm; the guide tube 2 is 2 mm higher than the upper seal 3, inserted into the lower seal 5 to a depth of 7 mm, and is connected to the upper seal 3 and the lower seal 5 before extrusion Bore clearance fit....

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Abstract

The invention provides a nozzle assembly of a miniature hydrogen flame ionization detector, which is composed of a nozzle, a guide tube, an upper seal, a sleeve, a lower seal, an upper pressing body, a lower pressing body and a detector body. The lower surface of the upper pressing body, the upper surface of the lower pressing body and the upper and lower surfaces of the casing are respectively provided with conical annular cutting edges. The upper and lower surfaces realize the embedded seal; at the same time, the conical annular cutting edge squeezes the upper and lower seals inward during the insertion process, making the inner hole smaller and squeezing the introduction tube, and finally seals the hydrogen cavity, air cavity and the upper and lower seals The contact gap between the inner hole and the outer diameter of the guide tube. The nozzle assembly of the present invention has the following advantages: the mechanical structure of the seal is simple, compact and more reliable; the dead volume of the combustion chamber is reduced, the air flow is more stable, and the μ-FID noise is smaller.

Description

technical field [0001] The invention relates to the technical field of hydrogen flame ionization detectors, in particular to a nozzle assembly of a miniature hydrogen flame ionization detector. Background technique [0002] Hydrogen Flame Ionization Detector (FID) is the most widely used detector in gas chromatography. This type of detector uses hydrogen flame as ionization source to ionize the measured substance, and the micro current generated is amplified for detection. The outstanding advantage of FID is that it responds to almost all organic compounds, especially to hydrocarbons with high sensitivity (ppb level); changes in gas flow rate, pressure and temperature have little effect on its response; the linear range of FID reaches 6 On the order of magnitude, the time constant of the detector is between 2-5 ms, and the dead volume is almost zero. Portable micro-gas chromatographs are valued for their on-site real-time analysis capabilities. The traditional FID is not s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/68
CPCG01N30/68
Inventor 耿旭辉关亚风李盛红高岩
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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