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A nozzle assembly for a miniature hydrogen flame ionization detector

A detector and hydrogen flame technology, applied in instruments, measuring devices, scientific instruments, etc., can solve the problems of complex structure, long nozzle assembly, etc., and achieve better performance, stable insulation and pressure-resistant sealing performance, and good electrical insulation performance Effect

Active Publication Date: 2017-08-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to improve the deficiencies of the prior art, the present invention provides a new type of nozzle assembly for a miniature hydrogen flame ionization detector, which effectively solves the problems of the existing μ-FID sealing mechanical structure and long nozzle assembly, and at the same time Also improves reliability in the detector nozzle area

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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

Examples

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Embodiment 1

[0032] The μ-FID was developed using the new nozzle assembly, and its cross-sectional schematic diagram is shown in figure 1 As shown, it consists of nozzle 1, guide tube 2, upper ferrule 3, sleeve tube 4, lower ferrule 5 and detector body 6. The material of the nozzle 1, the guide tube 2 and the casing 4 is stainless steel, and the material of the upper ferrule 3 and the lower ferrule 5 is high-temperature-resistant fully 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 and out of the guide tube 2 is 3mm, and a layer of outer diameter 0.6mm and inner diameter 0.4mm is placed between the nozzle 1 and the guide tube 2 The three stainless steel tubes are first mechanically pressed to fix them coaxially, and then silver-welded at the seams to prevent air leakage. The inner diameter of the guide tube 2 is 0.8mm, the outer diameter is 1.6mm, and the length is 17mm; The lower ferrule 5 is clea...

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Abstract

The invention provides a nozzle assembly for a miniature hydrogen flame ionization detector (μ-FID), which is composed of a nozzle, a guide tube, an upper ferrule, a sleeve, a lower ferrule, a detector body and a screw cap. When the screw cap is tightened upwards, the truncated cone-shaped sealing surface of the second groove in the inner hole of the detector and the inverted truncated cone-shaped sealing surface of the screw cap press the top truncated cone-shaped sealing surfaces of the two ferrules up and down, and at the same time the middle of the two ferrules The metal sleeve squeezes the bottom plane of the two ferrules, so that the truncated conical sealing surface of the upper ferrule can seal the upper channel, and the truncated conical sealing surface of the lower ferrule seals the lower channel (through hydrogen). The nozzle assembly of the present invention has the following advantages: the mechanical structure of the seal is simple, compact and reliable; the length of the assembly is short, which reduces the volume of the μ-FID; the dead volume of the combustion chamber is reduced, the air flow is more stable, and the noise of the μ-FID is reduced small; and the nozzle assembly is easily replaceable.

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 substances, especially to hydrocarbon compounds with high sensitivity (ppb level), and the response value is proportional to the number of carbon atoms; it is not sensitive to inorganic substances; gas flow rate, pressure and temperature and other operations Changes in conditions have little effect on its response; the linear range of FID is 6-7 orders of magnitude, the time constant of the detector itself is between 2-5ms, the dead...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/68
Inventor 关亚风耿旭辉张健陈洋高岩
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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