Durable graphite tube for atomic absorption spectrometer

Abstract

The utility model relates to the technical field of graphite pipes, and discloses a durable graphite pipe for an atomic absorption spectrometer, which comprises a graphite pipe body, the top of the graphite pipe body is provided with a sample introduction hole, the left side and the right side of the outside of the graphite pipe body are fixedly connected with electrodes, the front side of the graphite pipe body is provided with an inner gas inlet pipe, and the inner gas inlet pipe is provided with a gas outlet. The outer portion of the electrode is provided with an outer gas inlet hole, the graphite pipe body is made of graphite, the outer portion of the inner gas inlet pipe is fixedly connected with a fixing pipe, the outer portion of the fixing pipe is fixedly connected with a limiting ring, and the outer portion of the limiting ring is rotationally connected with a rotating threaded pipe. According to the utility model, the sample can be effectively atomized and subjected to elemental analysis, and in the whole process, the design and material selection of the durable graphite pipe enable the sample to stably work for a long time in a high-temperature and chemical environment.

Description

Technical Field

[0001] The utility model relates to the technical field of graphite tubes, in particular to a durable graphite tube for an atomic absorption spectrometer. Background Art

[0002] In an atomic absorption spectrometer, the graphite tube is a key component. The graphite tube is a small, usually cylindrical container made of graphite that is used to heat the sample and atomize it. The interior of the graphite tube is designed to withstand high temperatures, which can effectively heat the sample to a high enough temperature to atomize it.

[0003] After searching: Chinese patent authorization announcement number: CN202614046U, it relates to the technical field of graphite tubes, and discloses a graphite heat pipe, including a hollow graphite tube, the ends of the graphite tube are filled with matching graphite plugs, the outer surface of the graphite tube is provided with a baked dense layer, and the end surface of the graphite plug away from the graphite tube is fixed with a sealing block. The utility model has a simple structure and a novel design. The outer surface of the graphite tube is provided with a baked dense layer, which improves the overall strength and has good tensile, bending and compressive properties.

[0004] The above patent embodiment records that "the two end caps of the graphite tube 1 are filled with matching graphite plugs 2, the outer surface of the graphite tube 1 is provided with a sintered dense layer 3, and the end face of the graphite plug 2 away from the graphite tube 1 is fixed with a sealing block 4. The diameter of the sealing block 4 is equal to the sum of the diameters of the graphite tube 1 and the sintered dense layer 3", which can improve the overall strength, but there is only one pore during use, which makes the working process imperfect. Therefore, in view of the above-mentioned deficiencies, a new durable graphite tube for atomic absorption spectrometer is proposed. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and proposes a durable graphite tube for an atomic absorption spectrometer, aiming to improve the problem that some graphite tubes have imperfect functions during use.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A durable graphite tube for an atomic absorption spectrometer comprises a graphite tube body, a sample inlet hole is provided on the top of the graphite tube body, electrodes are fixedly connected to the left and right sides of the outside of the graphite tube body, an inner gas inlet pipe is provided on the front side of the graphite tube body, and an outer gas inlet hole is provided on the outside of the electrode.

[0008] Furthermore, the graphite tube body is made of graphite.

[0009] Furthermore, the outside of the inner air inlet pipe is fixedly connected to a fixed pipe, the outside of the fixed pipe is fixedly connected to a limiting ring, and the outside of the limiting ring is rotatably connected to a rotating threaded pipe.

[0010] Furthermore, the inner wall of the rotating threaded tube is threadedly connected with a threaded butt tube.

[0011] Furthermore, a sealing ring is fixedly connected to an outer side of the fixed tube and an outer side of the threaded butt tube.

[0012] The utility model has the following beneficial effects:

[0013] In the utility model, with the coordinated use of the injection hole, electrode, inner gas inlet tube, outer gas inlet hole and other structures, the sample can be effectively atomized and elemental analysis can be performed. In the whole process, the design and material selection of the durable graphite tube are to enable it to work stably for a long time in high temperature and chemical environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A three-dimensional diagram of a durable graphite tube for an atomic absorption spectrometer proposed by the utility model;

[0015] Figure 2 The utility model discloses a cross-sectional view of a fixing tube structure of a durable graphite tube for an atomic absorption spectrometer.

[0016] Legend:

[0017] 1. Graphite tube body; 2. Inlet hole; 3. Electrode; 4. Internal air inlet tube; 5. External air inlet hole; 6. Fixed tube; 7. Limiting ring; 8. Rotating threaded tube; 9. Threaded butt tube; 10. Sealing ring. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] Reference Figure 1 and Figure 2The utility model provides an embodiment: a durable graphite tube for an atomic absorption spectrometer, comprising a graphite tube body 1, a sampling hole 2 is provided on the top of the graphite tube body 1, electrodes 3 are fixedly connected to the left and right sides of the outside of the graphite tube body 1, an inner gas inlet pipe 4 is provided on the front side of the graphite tube body 1, an outer gas inlet hole 5 is provided on the outside of the electrode 3, the material of the graphite tube body 1 is graphite, a fixed tube 6 is fixedly connected to the outside of the inner gas inlet pipe 4, a limiting ring 7 is fixedly connected to the outside of the fixed tube 6, a rotating threaded tube 8 is rotatably connected to the outside of the limiting ring 7, a threaded butt tube 9 is threadedly connected to the inner wall of the rotating threaded tube 8, and a sealing ring 10 is fixedly connected to the outer side of the fixed tube 6 and the outer side of the threaded butt tube 9.

[0020] Compared with some devices in the prior art, the above content can work stably for a long time in high temperature and chemical environment.

[0021] Working principle: The sample is added to the graphite tube through the injection hole 2 located at the top of the graphite tube body 1. Once the sample is placed, the graphite tube body 1 is heated by external electrodes 3. These electrodes 3 are connected to a power supply to provide the necessary current to quickly reach a high temperature, usually several thousand degrees Celsius, in order to efficiently and quickly atomize the sample. In order to control the environment inside the graphite tube, the internal gas inlet tube 4 is used to introduce protective gas, such as argon, which helps to create a stable and controlled atmosphere to prevent or reduce chemical reactions and oxidation of elements. The protective gas enters the graphite tube through the fixed tube 6 and the limit ring 7, where the limit ring 7 is adjusted by rotating the threaded tube 8 to ensure precise control of the gas flow. The rotating threaded tube 8 is threadedly connected to the threaded butt tube 9 to form an adjustable sealing system. The sealing ring 10 ensures that there will be no gas leakage at these connections. The external gas inlet hole 5 is used to introduce auxiliary gas. This gas flows around the electrodes 3 to help control the temperature of the graphite tube and prevent the graphite material from wearing too quickly under extreme conditions. This design not only improves the service life of the graphite tube, but also ensures the stability and repeatability of the analysis process.

[0022] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A durable graphite tube for an atomic absorption spectrometer, comprising a graphite tube body (1), characterized in that: The top of the graphite tube body (1) is provided with a sample inlet (2), the left and right sides of the outside of the graphite tube body (1) are fixedly connected to electrodes (3), the front side of the graphite tube body (1) is provided with an internal air inlet pipe (4), and the outside of the electrode (3) is provided with an external air inlet hole (5).

2. The durable graphite tube for atomic absorption spectrometer according to claim 1, characterized in that: The material of the graphite tube body (1) is graphite.

3. The durable graphite tube for atomic absorption spectrometer according to claim 1, characterized in that: The outside of the internal air inlet pipe (4) is fixedly connected to a fixed pipe (6), the outside of the fixed pipe (6) is fixedly connected to a limit ring (7), and the outside of the limit ring (7) is rotatably connected to a rotating threaded pipe (8).

4. The durable graphite tube for atomic absorption spectrometer according to claim 3, characterized in that: The inner wall of the rotating threaded tube (8) is threadedly connected with a threaded butt-jointed tube (9).

5. The durable graphite tube for atomic absorption spectrometer according to claim 4, characterized in that: A sealing ring (10) is fixedly connected to the outer side of the fixed tube (6) and the outer side of the threaded butt tube (9).

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