Detachable microwave induction plasma torch tube

Abstract

The invention discloses a detachable microwave induction plasma torch tube which comprises the components of an outer tube, a middle tube, an inner tube, and a fixing device, wherein the outer tube, the middle tube and the inner tube are independent from each other. The fixing device is used for basically fixing the outer tube, the middle tube and the inner tube coaxially. The fixing device comprises a first clamping member which is detachably connected with the outer tube, a second clamping member which is detachably connected with the middle tube, and a third clamping member which is detachably connected with the inner tube. The second clamping member is provided with a middle air inlet which makes auxiliary gas enter a space between the inner tube and the middle tube. The first clamping member is provided with an outer gas inlet which makes cooling gas enter a space between the middle tube and the outer tube. According to the microwave induction plasma torch tube, the outer tube, the middle tube and the inner tube which are independent from one another are utilized. Compared with an integrated torch tube, the split type torch tube has advantages of realizing higher convenience in machining, realizing random change of the outer tube, the middle tube and the inner tube, preventing change of the whole torch tube on the condition of outer tube burndown, and effectively reducing change cost and maintenance cost of the torch tube.

Description

technical field [0001] The invention relates to the technical field of spectral analysis, in particular to a detachable microwave induction plasma torch. Background technique [0002] As the core component of atomic emission spectrometry (AES), the excitation light source atomizes, excites, and ionizes the sample to be measured, and is used to provide spectral information of the element to be measured. Its performance often determines the quality of the information provided. As the excitation light source of AES, plasma light source has been widely used, mainly divided into two categories: Inductively Coupled Plasma (ICP) and Microwave Plasma (MWP). Among them, inductively coupled plasma (ICP) is widely used because of its low detection limit, small matrix effect, high precision, high sensitivity, wide linear range and simultaneous analysis of multiple elements. However, since the spectroscopic analysis instrument using ICP consumes a large amount of rare gas - argon, its i...

AI Technical Summary

Problems solved by technology

However, the existing MIP torches all adopt an integrated design of inner tube, intermediate tube and outer tube structure. During use, the outer quartz tube is easily damaged due to gas flow rate, microwave power deviation from normal value or other reasons. Plasma ablation damage, and relatively speaking, the center tube, which has a more complex structure than the outer tube, is less likely to be damaged

When the outer tube is damaged, the outer tube cannot be replaced with a new one, only the whole torch can be replaced, which makes the replacement and repair cost of the plasma torch too high

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