CN2186474Y

CN2186474Y - Microwave plasma torch

Info

Publication number: CN2186474Y
Application number: CN 94205428
Authority: CN
Inventors: 金钦汉; 张寒琦; 杨文军
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 1994-03-30
Filing date: 1994-03-30
Publication date: 1994-12-28
Anticipated expiration: 2004-03-30

Abstract

The utility model relates to a microwave plasma torch, belonging to the technical field of chemistry and measurement, particularly a microwave plasma obtaining device. The microwave plasma torch can be used as the light source of a fluorescence spectrum for atomic emission and the ion source of an atomic spectrum, mainly comprising three concentric metal tubes, and microwave energy can enter the tubes of the torch via capacity coupling. The utility model has the advantages of high bearing capability of samples, high excitation capability, wide detection range, broad linear range, simple fabrication, convenient operation, low running cost, etc. in the use of atomic emission spectrum analysis.

Description

Microwave plasma torch

The utility model belongs to technical field of chemical measurement, be that a kind of microwave plasma obtains device, it can also can be used for decomposition, the processing of hazardous compound as the light source or the required atom or the ion source of Other Instruments analysis (as atomic fluorescence and atomic spectroscopy) of emission spectrum.

It mainly is to obtain with various resonant cavitys or surfa-tron that present microwave plasma obtains device, but these obtain in the device of microwave plasma, there is more serious electrode fouling problem in (as the capacitance coupling plasma) that have, have (as coaxial cavity TM ₀₁₀The microwave induced plasma of chamber and Surfatron) be to carry out in discharge tube, the ability to bear of sample is low, and (as the coaxial cavity) that has can only be made work gas or need under reduced pressure (when making work gas with helium) just can keep with argon gas.

The purpose of this utility model provides a kind of microwave plasma and obtains device, and this device can multiple working gas work, and can form under normal pressure.Because of being opening plasma discharge, plasma itself does not directly contact with the torch pipe, does not have the electrode fouling problem again.Also strengthen greatly simultaneously because there is centre gangway in plasma, thereby to the ability to bear of sample.

The utility model structure is mainly by the torch tube portion, the microwave energy coupling unit, and tuning and slave part is formed, and the torch tube portion comprises outer tube 1, middle pipe 2, interior pipe 3, pad 4; The microwave energy coupling unit comprises coupling 5, insulator 6, coupling conductors 7, coupling loop 8, coupling loop fixed screw 9, joint and coupling loop regulating block 10; Tuning and slave part comprises regulating piston 11, adjusting knob 12, support 13, clamp nut 14.Wherein, outer tube 3 internal diameters are 20-25mm, and outer tube and middle caliber are than between 4-5, and interior pipe radius is 1-2mm.

Outer tube wall of the present utility model is with holes, coupling conductors 7 stretches into from the hole, be fixed together with coupling loop 8, coupling loop 8 closely contacts with middle pipe 2, unscrew coupling loop fixed screw 9, up-down adjustment coupling loop regulating block 10 makes the distance of coupling conductors 7 and torch pipe upper port reach a correct position, makes plasma be easy to light.

When the utility model is tuning, about turn tuning knob 12, tuning plunger 11 promptly moves up and down in the chamber, so that because the standing wave abdomen that microwave reflection forms accurately is positioned the plasma part.

The utility model entire infrastructure is detachable, is beneficial to timely cleaning, and is simultaneously easy for installation.

The utility model is because sample enters plasma from a centre gangway, also being difficult for scold when a large amount of relatively moisture and other material are entered goes out, thereby solved the low problem of sample ability to bear that general microwave plasma often runs into well, also having available multiple gases simultaneously works under normal pressure, excite ability strong, the range of linearity is wide, and the detection elements scope is wide, standing charges are low, processing, characteristics such as easy to operate.

Accompanying drawing is a schematic diagram of the present utility model.

The utility model course of work is as follows:

Working gas (argon gas, helium or nitrogen) is directly connected to the central blow vent that connects together with support 13, enter between pipe 2 and the interior pipe 3, carry sample colloidal sol and enter interior pipe 3 from the bottom by the supporting ring 4 arrival mouths of pipe, the carrier gas (argon or helium) that have symmetrical aperture, with the spark ignition plasma that interior pipe and middle pipe instantaneous short circuit form, sample can be in plasma atomization, excite even ionization.

The utlity model has versatility widely, except that the light source that can be used as emission spectrum, also can be used for atomic fluorescence spectrophotometry, chromatogram, mass spectrum etc. and analyze field tests.

Claims

1, a kind of microwave plasma torch, it is by three coaxial metal pipes, the microwave energy coupling unit, tuning part is formed, and it is characterized in that it being the open microwave plasma torch pipes of a kind of three pipe coaxial types one ends.

2, microwave plasma torch according to claim 1 is characterized in that microwave energy enters the torch pipe with capacitive coupling, and distance is adjustable between coupling loop and torch pipe upper port.

3, microwave plasma torch according to claim 1 is characterized in that plasma forms with the space that makes progress, and for the discharge of class flame-shaped, does not directly contact with the torch pipe between the interior pipe 3 and middle pipe 2 mouths of pipe.

4, microwave plasma torch according to claim 1, it is tuning to it is characterized in that torch tube cavity body length can be undertaken by tuning part, tuning can carrying out in greater than the length range of 3/4 times of microwave wavelength less than 1/4.

5, microwave plasma torch according to claim 1 is characterized in that and can use argon gas under normal pressure that helium or nitrogen are kept, and the plasma of formation has a tangible centre gangway.