Sample filament supporting device suitable for thermal ionization isotope mass spectrometer

Abstract

The utility model relates to the technical field of filament supporting, in particular to a sample filament supporting device suitable for a thermal ionization isotope mass spectrometer. The utility model has the advantages that: on one hand, the ceramic support plate has a structure support effect at high temperature and has good electrical insulation performance at high temperature; the power supply binding post and the filament fixing column which are made of metal materials have good conductive performance at high temperature and need to have good mechanical performance in a high-temperature environment, it is guaranteed that the structure of the filament supporting device is stable and does not deform, and both ceramic and metal have good high-temperature-resistant performance. In the analysis and test process of the thermal ionization isotope mass spectrometer, a single sample filament supporting device can repeatedly detect and analyze more than 30 samples, and the function is still normal; a single sample filament supporting device randomly equipped with an imported instrument generally can only detect and analyze 2-3 samples, and the product price of the lamp filament supporting device is about 30% of the price of an imported product.

Description

TECHNICAL FIELD

[0001] The utility model relates to lamp filament support technical field, especially a sample lamp filament support device suitable for thermal ionization isotope mass spectrometer. BACKGROUND

[0002] Thermal ionization mass spectrometry as the classic method of isotope abundance ratio determination in the field of radiochemical analysis measurement technology, because it has the characteristics of less sample quantity, not limited by sample compound form, extremely small sample cross interference, suitable for dilution sample of isotope compound, high sensitivity, etc., is widely used in nuclear fuel cycle, geological survey and earth science research industry, especially in nuclear fuel cycle production and process technology research, is often used for the determination of U (uranium), Pu (plutonium), Np (neptunium) and other radioisotope abundance in nuclear fuel.

[0003] Thermal ionization isotope mass spectrometry technology includes two basic processes: ion source preparation and ion flow signal detection analysis. Among them, the preparation of ion source is the first step of thermal ionization isotope mass spectrometry measurement, which plays a decisive role in the whole analysis and measurement process: the sample containing uranium or plutonium isotope is prepared into a solution of a certain concentration, which is coated on a high melting point Re (rhenium), Pt (platinum) or W (tungsten) strip-shaped metal heating filament; In the appropriate vacuum environment, the strip-shaped filament is applied with appropriate current, and the strip-shaped metal filament is heated to the design temperature (2000℃-2200℃), the sample solution is dried and the target element is thermally ionized to form an ion source.

[0004] And the sample filament support device is an important part of the ion source preparation of thermal ionization isotope mass spectrometer. Because its working environment temperature is relatively high (above 1000℃), and it needs to have high electrical insulation level with the metal sample disc of the mass spectrometer. More importantly, the sample filament support device has a particularly high damage rate during use, and generally needs to be replaced after testing 2-3 samples, which makes the instrument running stability and continuity poor, and the sample analysis and detection cost is high. UTILITY MODEL CONTENT

[0005] The utility model aims at solving at least one of the technical defects.

[0006] Therefore, one purpose of the utility model is to provide a sample filament support device suitable for thermal ionization isotope mass spectrometer, so as to solve the problems mentioned in the background art and overcome the deficiencies in the prior art.

[0007] In order to achieve the above object, the utility model one aspect of embodiment provides a kind of sample filament support device suitable for thermal ionization isotope mass spectrometer, including ceramic support plate, two power supply terminals and two filament fixing components, two the power supply terminals are all fixedly connected with the both sides of the middle part of ceramic support plate surface using detachable fixed mode, two the filament fixing components are also fixedly connected with the top of power supply terminal using detachable fixed mode, the power supply terminal is metal material.

[0008] It is preferred from any of the above solutions that the two sides of the surface of the ceramic support plate are fixedly connected with connecting nuts, the connecting nuts penetrate the ceramic support plate, and the power supply terminals are threadedly connected with the connecting nuts and penetrate the connecting nuts.

[0009] The technical effect achieved by the above solution is that the ceramic support plate and the power supply terminals are connected and fixed by screw rods and nuts, so that the assembly of the overall device is simple and convenient.

[0010] It is preferred from any of the above solutions that the end of the power supply terminal close to the filament fixing component is bent upward, and a threaded connector is fixedly connected to the center of the upwardly bent end of the power supply terminal.

[0011] The technical effect achieved by the above solution is that the power supply terminal holds up the filament fixing component upward to support the filament to be detected.

[0012] Both the filament fixing components include a connecting cap, the outer wall of the connecting cap is fixedly connected with the filament fixing column on one side, and the inner wall of the connecting cap is threadedly connected with the threaded connector.

[0013] The technical effect achieved by the above solution is that the power supply terminals and the filament fixing components are connected and fixed by screw rods and nuts, internal threads and screw rods, so that once a component is damaged during the use of the filament support device, only the corresponding component needs to be replaced, and other components can continue to be used.

[0014] It is preferred from any of the above solutions that the connecting cap is made of metal material, the diameter of the connecting cap is matched with the diameter of the power supply terminal, the depth of the inner wall of the connecting cap is equal to the length of the power supply terminal, and the filament fixing column is a square metal rod.

[0015] The technical effect achieved by the above solution is that the filament fixing column made of metal material has good electrical conductivity at high temperature and good mechanical properties in high temperature environment, ensuring the stability of the structure of the filament support device without deformation.

[0016] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0017] 1. The sample filament support device suitable for thermal ionization isotope mass spectrometer, the ceramic support plate has structural support effect at high temperature, and has good electrical insulation performance at high temperature; the power supply terminal post and the filament fixing column of metal material have good electrical conductivity at high temperature, and need to have good mechanical properties in the high temperature environment, ensure that the filament support device structure is stable and does not deform, the ceramic and metal have good high temperature resistance, so that the filament support device as a whole has very good high temperature resistance; in particular, the ceramic support plate has a high temperature resistance of 3000 DEG C or more, and the practice proves that the single sample filament support device can detect and analyze more than 30 samples in the analysis and test process of the thermal ionization isotope mass spectrometer, and the structure is still stable and the function is still normal; and the sample filament support device randomly provided with the imported instrument can generally detect and analyze only 2-3 samples, and compared with the sample filament support device randomly provided with the imported thermal ionization isotope mass spectrometer, the price of the product of the utility model is about 30% of the price of the imported product.

[0018] 2. The sample filament support device suitable for thermal ionization isotope mass spectrometer, the ceramic support plate and the power supply terminal post are connected and fixed by a screw rod and a nut, and the power supply terminal post and the filament fixing column are connected and fixed by an internal thread and a screw rod, so that the whole device is simple and convenient to assemble, and the ceramic support plate, the power supply terminal post and the filament fixing column of the sample filament support device are connected and fixed by a screw rod and a nut, an internal thread and a screw rod, so that during use of the filament support device, once a part is damaged, only the corresponding part needs to be replaced, and other parts can continue to be used. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the utility model;

[0020] Figure 2 It is a top view structural schematic view of the utility model;

[0021] Figure 3 It is a sectional view of the utility model Figure 2 A-A.

[0022] In the figure: 1-ceramic support plate, 2-power supply terminal post, 3-filament fixing column, 4-connection cap, 5-connection nut, 6-threaded connection head. DETAILED DESCRIPTION

[0023] The utility model will be further described below in combination with the drawings, but the protection scope of the utility model is not limited to the following.

[0024] Example one: as Figures 1 to 3As shown in the drawing, a sample filament support device suitable for thermal ionization isotope mass spectrometer, it includes ceramic support plate 1, two power supply terminals 2 and two filament fixing assemblies, two power supply terminals 2 are all fixedly connected to both sides of the middle part of the surface of ceramic support plate 1 in a detachable manner, two filament fixing assemblies are also all fixedly connected to the top of power supply terminals 2 in a detachable manner, and power supply terminals 2 are made of metal material.

[0025] As an optional technical scheme of the utility model, the both sides of the surface of ceramic support plate 1 are fixedly connected with connecting nuts 5, the connecting nuts 5 penetrate through ceramic support plate 1, the power supply terminals 2 are threadedly connected with the connecting nuts 5 and penetrate through the connecting nuts 5, so that the connecting and fixing mode of screw rod and nut is adopted between ceramic support plate 1 and power supply terminals 2, so that the assembly of the whole device is simple and convenient.

[0026] As an optional technical scheme of the utility model, the end of power supply terminals 2 close to filament fixing assemblies is bent upwards, a threaded connector 6 is fixedly connected to the center of the upwardly bent end of power supply terminals 2, so that power supply terminals 2 lift filament fixing assemblies upwards to support the filament to be detected.

[0027] As an optional technical scheme of the utility model, the both sides of the surface of ceramic support plate 1 are fixedly connected with connecting nuts 5, the connecting nuts 5 penetrate through ceramic support plate 1, the power supply terminals 2 are threadedly connected with the connecting nuts 5 and penetrate through the connecting nuts 5, so that the connecting and fixing mode of screw rod and nut is adopted between ceramic support plate 1 and power supply terminals 2, so that the assembly of the whole device is simple and convenient.

[0028] As an optional technical scheme of the utility model, the connecting cap 4 is made of metal material, the diameter of connecting cap 4 is matched with the diameter of power supply terminals 2, the depth of the inner wall of connecting cap 4 is equal to the length of power supply terminals 2, and the filament fixing column 3 is a square metal rod material; the filament fixing column 3 made of metal material has good electrical conductivity at high temperature and needs to have good mechanical properties in a high-temperature environment to ensure that the structure of the filament support device is stable and does not deform.

[0029] A sample filament support device suitable for thermal ionization isotope mass spectrometer has the following working principle:

[0030] 1) The ceramic support plate 1 has a structural support function at high temperature and has good electrical insulation performance at high temperature;

[0031] 2) The power supply terminals 2 and the filament fixing column 3 made of metal material need to have good electrical conductivity at high temperature and need to have good mechanical properties in a high-temperature environment to ensure that the structure of the filament support device is stable and does not deform;

[0032] 3) The power terminal 2 and the filament fixing post 3 are connected and fixed by internal thread and screw, which makes the overall assembly of the device simple and convenient. The ceramic support plate 1, power terminal 2 and filament fixing post 3 of the sample filament support device are connected and fixed by screw and nut, internal thread and screw, so that if a part is damaged during the use of the filament support device, only the corresponding part needs to be replaced and the other parts can continue to be used.

[0033] A sample filament support device suitable for a thermal ionization isotope mass spectrometer, the manufacturing steps of which are as follows:

[0034] (1) Processing of ceramic support plate

[0035] Based on the size requirements of the sample filament support device for the thermal ionization isotope mass spectrometer sample plate, two circular holes of suitable diameter are drilled on the prepared small ceramic material plate, and the edges of the ceramic material plate are polished smooth.

[0036] (2) Machining of power supply terminals

[0037] First, bend the cut short cylindrical metal rods into the required regular right-angle bends;

[0038] Secondly, according to the assembly requirements, an internal thread hole is machined on the side of the short columnar metal rod in the direction parallel to the right-angle plane at one end.

[0039] Finally, a thread is machined into the other end of the short cylindrical metal rod, and two suitable bolts are selected and fitted onto it.

[0040] (3) Fabrication of filament fixing posts

[0041] One end of the prepared small square metal rod is machined into a cylindrical shape and a suitable thread is machined for connection and fixation with the power terminal.

[0042] The assembly steps are as follows:

[0043] according to Figure 1 The schematic diagram of the sample filament support device shown is illustrated below, and its assembly steps are as follows:

[0044] (1) Pre-install a nut on the threaded end of the power terminal, adjust it to a suitable position, and pass the threaded end of the power terminal through the round hole on the ceramic material plate. Use another nut on the other side of the ceramic material plate to fix the power terminal on the ceramic material plate.

[0045] (2) Install the finished filament fixing post with a threaded section onto the internal threaded hole at the other end of the power terminal.

[0046] (3) the other power supply terminal post of the sample filament support device is assembled according to the steps (1) and (2);

[0047] (4) the components of the sample filament support device preliminarily assembled are adjusted to meet the fixing requirements on the sample disc of the thermal ionization isotope mass spectrometer.

[0048] In summary, the sample filament support device for the thermal ionization isotope mass spectrometer has the following advantages: the ceramic support plate has a structural support function at high temperature and good electrical insulation performance at high temperature; the power supply terminal post and the filament fixing post made of metal have good electrical conductivity at high temperature and good mechanical properties at high temperature, ensuring the stability of the structure of the filament support device and preventing deformation; both ceramic and metal have good high-temperature resistance, so that the filament support device as a whole has good high-temperature resistance; in particular, the ceramic support plate has a high-temperature resistance of up to 800 DEG C, which is higher than that of common insulating materials such as bakelite and resin; the ceramic support plate and the power supply terminal post are connected and fixed by a screw and a nut, and the power supply terminal post and the filament fixing post are connected and fixed by an internal thread and a screw, so that the assembly of the device as a whole is simple and convenient; the ceramic support plate, the power supply terminal post and the filament fixing post of the sample filament support device are connected and fixed by a screw and a nut, an internal thread and a screw, so that during the use of the filament support device, if a component is damaged, only the corresponding component needs to be replaced, and other components can continue to be used.

[0049] Although the embodiments of the utility model have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model, and those skilled in the art can change, modify, replace and transform the above-mentioned embodiments within the scope of the utility model without departing from the principles and purposes of the utility model. The scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A sample filament support device suitable for a thermal ionization isotope mass spectrometer, characterized in that: It includes a ceramic support plate (1), two power terminals (2) and two filament fixing components. The two power terminals (2) are fixedly connected to both sides of the middle part of the surface of the ceramic support plate (1) in a detachable fixing manner. The two filament fixing components are also fixedly connected to the top of the power terminals (2) in a detachable fixing manner. The power terminals (2) are made of metal.

2. The sample filament support device for a thermal ionization isotope mass spectrometer according to claim 1, characterized in that: Both sides of the surface of the ceramic support plate (1) are fixedly connected with connecting nuts (5), the connecting nuts (5) penetrate the ceramic support plate (1), and the power terminal (2) is threadedly connected to the connecting nuts (5) and penetrates the connecting nuts (5).

3. A sample filament support device suitable for a thermal ionization isotope mass spectrometer according to claim 2, characterized in that: The power terminal (2) is bent upward at one end near the filament fixing assembly, and a threaded connector (6) is fixedly connected at the center of the upwardly bent end of the power terminal (2).

4. A sample filament support device suitable for a thermal ionization isotope mass spectrometer according to claim 3, characterized in that: Both of the filament fixing assemblies include a connecting cap (4), and a filament fixing post (3) is fixedly connected to one side of the outer wall of the connecting cap (4). The inner wall of the connecting cap (4) is threadedly connected to a threaded connector (6).

5. A sample filament support device suitable for a thermal ionization isotope mass spectrometer according to claim 4, characterized in that: The connecting cap (4) is made of metal. The diameter of the connecting cap (4) is matched with the diameter of the power terminal (2). The depth of the inner wall of the connecting cap (4) is equal to the length of the power terminal (2). The filament fixing post (3) is made of square metal rod material.

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