A new type of combustion tube for on-line ion chromatography

Abstract

The utility model discloses a novel combustion on -line ion chromatograph with combustion tube, the combustion tube passes through combustion furnace and includes the inner tube and outer tube of setting, the inner tube forms the hollow chamber of through and includes the axial arrangement of second pipe section and first pipe section along the airflow direction, the interlayer cavity of relatively airtight is formed between the inner tube and outer tube, the interlayer cavity is communicated with the hollow chamber through a plurality of through -holes on first pipe section, the second end where second pipe section extends to the outer tube is communicated with first import, and the interlayer cavity is communicated with second import close to second pipe section second end place. The utility model discloses reasonable in structure is favorable to reduce production cost, is favorable to improve combustion stability.

Description

Technical Field

[0001] This utility model relates to the technical field of equipment for ion chromatography detection, specifically a novel combustion tube for an online combustion ion chromatograph. Background Technology

[0002] The analysis of elemental content in samples is involved in many fields such as mineral resources, metallurgical engineering, environmental science, and food safety. Ion chromatography is the most commonly used instrument for elemental content analysis. In the process of determining the elemental content of samples using ion chromatography, high-temperature pyrolysis pretreatment of samples has become a highly regarded pretreatment method for elemental analysis in recent years. This method combines the characteristics of high-temperature pyrolysis and water distillation. High-temperature pyrolysis mainly utilizes the volatility of some elements (such as halogens), releasing them from their salts or other compounds in the form of vapor at high temperatures (such as 1100℃). The vapor is then absorbed in a suitable absorbent, thereby achieving the separation and enrichment of the analyte. In existing technologies, to accurately and rapidly determine the elemental content in samples, high-temperature pyrolysis pretreatment of samples is generally performed in the high-temperature combustion tube of the detection equipment. While heating, ultrapure water and oxygen are introduced into the combustion tube to carry out the sample pyrolysis reaction.

[0003] In the existing technology, the inner and outer tubes of the combustion tube are usually made of quartz material, which has high temperature resistance, good thermal stability, good chemical stability and electrical insulation. In practice, if fluoride ions are present during the sample combustion process, the fluoride ions are more active and can react with quartz, especially in the high-temperature combustion section, and may even damage the passivation layer on the surface of the quartz, leading to damage or corrosion of the quartz tube. Utility Model Content

[0004] This utility model discloses a novel combustion tube for an online combustion ion chromatograph, which solves the technical problems of easy damage and corrosion of existing combustion tubes, and the resulting inefficiencies in reducing production costs. It offers the advantages of a reasonable structure, reduced production costs, and improved combustion stability. The technical solution adopted is as follows: A novel combustion tube for an online combustion ion chromatograph, the combustion tube passing through a combustion furnace and comprising an inner tube and an outer tube, the inner tube forming a through hollow cavity and comprising a second tube segment and a first tube segment arranged axially along the gas flow direction, the inner tube and the outer tube forming a relatively sealed interlayer cavity, the interlayer cavity communicating with the hollow cavity through several through holes on the first tube segment, the second tube segment extending out of the outer tube having a first inlet connected to its second end, and the interlayer cavity having a second inlet connected to its second end near the second tube segment.

[0005] Based on the above technical solution, the first pipe section is made of high-temperature resistant ceramic and is integrally formed.

[0006] Based on the above technical solution, a number of through holes are evenly arranged, and the positions of the number of through holes on the first pipe section are designed to correspond to the positions of the sample boats extending into the first pipe section.

[0007] Based on the above technical solution, the outlet end of the first pipe section away from the second pipe section is axially abutted against the inner wall of the outer pipe through high-temperature resistant filter cotton.

[0008] Based on the above technical solution, the outlet end of the first pipe section is inserted into the reduced diameter section at the corresponding position of the outer pipe, and the high temperature resistant filter cotton is placed at one end of the reduced diameter section. The inlet end of the first pipe section is fitted into the outlet end of the second pipe section and abuts against the end face formed by the expanded diameter section of the second pipe section.

[0009] Based on the above technical solution, a clamping component is also included. The end of the second pipe segment away from the first pipe segment is sealed to the outer pipe through surface-to-surface contact. The clamping component is designed to axially clamp the inner pipe and the outer pipe to form a relatively closed interlayer cavity.

[0010] Based on the above technical solution, the second pipe section is fitted with a bulge. The outer wall surface of the bulge is formed with a first conical surface, and the inlet end of the outer pipe corresponding to the position of the bulge is formed with a second conical surface that mates with the first conical surface. The second pipe section and the outer pipe are sealed through contact between the first and second conical surfaces. Preferably, the surfaces in contact with the first and second conical surfaces are frosted surfaces. The tiny uneven structures on the two frosted surfaces cooperate to achieve a good sealing effect and also prevent relative sliding between the inner and outer pipes.

[0011] Based on the above technical solution, the clamping assembly includes a plurality of first hook teeth and a plurality of second hook teeth. The plurality of first hook teeth are circumferentially arranged on the outer wall surface of the outer tube, and the plurality of second hook teeth are circumferentially arranged on the outer wall surface of the bulge extending out of the outer tube. The first hook teeth and the second hook teeth are connected by an elastic element to axially clamp the inner tube and the outer tube.

[0012] Based on the above technical solution, the second inlet avoids the bulge, and the pipe connected to the second inlet has an angle that is inclined from bottom to top in the direction of airflow.

[0013] Based on the above technical solution, the outlet end of the outer tube extends axially outward to form an extension section, and the outer wall surface of the outlet end of the extension section bulges outward to form a conical or spherical surface to facilitate sealing connection.

[0014] Beneficial effects This utility model has a reasonable structure. The inner tube includes a first pipe section and a second pipe section that are connected to each other. In this way, when the first pipe section is damaged or corroded, it can be replaced to extend the service life of the entire combustion tube, which helps to reduce costs. Furthermore, the first pipe section can be made of a high-temperature resistant ceramic material with better chemical stability, which further improves the service life of the combustion tube and reduces costs.

[0015] In this invention, the outlet end of the inner tube abuts against the inner wall of the outer tube, and the inlet end of the inner tube is sealed through surface-to-surface contact. The sealing assembly axially presses the inner and outer tubes together, facilitating disassembly and replacement while simplifying the connection and installation structure and improving ease of use, all while ensuring a tight seal. Furthermore, the outlet end of the outer tube forms a conical or spherical surface, facilitating a sealed connection with adjacent components. In this invention, the second tube section is fitted with a bulge forming a first conical surface, and the inner wall of the outer tube corresponding to the first conical surface forms a second conical surface. This facilitates the formation of a frosted surface on the two contact surfaces of the first and second conical surfaces, improving the reliability of the sealed connection.

[0016] The clamping assembly of this utility model includes a plurality of first hook teeth and a plurality of second hook teeth, and the first hook teeth and the second hook teeth are connected by an elastic element, which further facilitates disassembly and assembly. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of this utility model. For those skilled in the art, other embodiments can be derived from the provided drawings without creative effort.

[0018] Figure 1 : A three-dimensional structural schematic diagram of this utility model; Figure 2 : A cross-sectional structural schematic diagram of the main view of this utility model; Detailed Implementation The following description and accompanying drawings fully illustrate specific embodiments described herein to enable those skilled in the art to practice them. Some embodiments may include or substitute parts and features of other embodiments. The scope of the embodiments herein encompasses the entire scope of the claims and all available equivalents thereof. Throughout this document, the terms “first,” “second,” etc., are used only to distinguish one element from another without requiring or implying any actual relationship or order between the elements. Indeed, a first element can also be referred to as a second element, and vice versa. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a structure, apparatus, or device. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the structure, apparatus, or device that includes said element. The various embodiments described herein are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments; similar or identical parts between embodiments can be referred to interchangeably.

[0019] The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used in this document to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings. They are used solely for the convenience of describing the document and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description herein, unless otherwise specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two elements; they can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0020] In this document, unless otherwise stated, the term "multiple" means two or more.

[0021] In this article, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0022] In this article, the term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0023] In this embodiment, the guide tube, sample boat chamber, and combustion tube are connected in sequence along the airflow direction. The guide tube, sample boat chamber, and combustion tube together form a through channel. A push rod can slide back and forth along the channel. The end of the push rod can load the sample boat in the sample boat chamber and send the sample boat into the combustion tube for sample combustion.

[0024] like Figure 1 and 2 The illustration shows a novel combustion tube for an online combustion ion chromatograph, which passes through a combustion furnace and includes an inner tube 21 and an outer tube 22.

[0025] like Figure 2 As shown, the inner tube 21 forms a through hollow cavity and includes a second tube section 212 and a first tube section 211 arranged axially along the airflow direction. In this embodiment, the first tube section 211 is made of high-temperature resistant ceramic and is integrally formed, while the second tube section 212 is made of quartz material, both of which have good high-temperature resistance.

[0026] like Figure 2 As shown, a relatively closed interlayer cavity is formed between the inner tube 21 and the outer tube 22. The interlayer cavity is connected to the hollow cavity through several through holes 2111 on the first tube section 211. The several through holes 2111 are evenly arranged, and the positions of the several through holes 2111 on the first tube section 211 are designed to correspond to the positions of the sample boats that extend into the first tube section 211. This facilitates good gas exchange between the hollow cavity and the interlayer cavity and improves combustion completeness.

[0027] like Figure 1 and 2 As shown, the outlet end of the first pipe section 211, which is away from the second pipe section 212, is inserted into the reduced diameter section 222 at the corresponding position of the outer pipe. The outlet end of the first pipe section 211 is axially abutted against the inner wall of the outer pipe 22 through the high temperature resistant filter cotton 25 to seal the interlayer cavity. In this embodiment, the high temperature resistant filter cotton 25 is made of quartz wool. In addition, those skilled in the art can select according to their needs.

[0028] like Figure 2 As shown, the inlet end of the first pipe section 211 is fitted inside the outlet end of the second pipe section 212 and abuts against the end face formed by the expanded diameter section of the second pipe section 212.

[0029] The end of the second pipe section 212 furthest from the first pipe section 211 is sealed to the outer pipe 22 through surface-to-surface contact, specifically, as follows: Figure 2As shown, the second pipe section 212 is fitted with a bulge 2121. The bulge 2121 is made of quartz and is fixed outside the second pipe section 212. A closed annular cavity is formed between the bulge 2121 and the second pipe section 212. The outer wall surface of the bulge 2121 is formed with a first conical surface 2120. The radial dimension of the first conical surface 2120 gradually decreases along the airflow direction. The inlet end of the outer pipe 22, which corresponds to the position of the bulge 2121, is formed with a second conical surface 221 that matches the first conical surface 2120. The surfaces of the first conical surface 21210 and the second conical surface 221 that come into contact are frosted surfaces. The tiny uneven structures on the two frosted surfaces work together to achieve a good sealing effect and prevent relative sliding between the inner pipe 21 and the outer pipe 22. In this way, the second pipe section 212 and the outer pipe 22 are sealed by the contact of the first conical surface 2120 and the second conical surface 221, thus effectively sealing the interlayer cavity.

[0030] It also includes a clamping assembly 26. In this embodiment, the clamping assembly 26 is designed to axially clamp the inner tube 21 and the outer tube 22 to form a relatively sealed interlayer cavity. Specifically, the clamping assembly 26 includes a plurality of first hook teeth 261 and a plurality of second hook teeth 263. The plurality of first hook teeth 261 are circumferentially arranged on the outer wall surface of the outer tube 22, and the plurality of second hook teeth 262 are circumferentially arranged on the outer wall surface of the bulge 2121 extending out of the outer tube 22. The first hook teeth 261 and the second hook teeth 262 are connected by an elastic element, which is existing technology, such as a spring, to axially clamp the inner tube 21 and the outer tube 22, so that the first tube segment 211 is pressed against the high-temperature resistant filter cotton 25, and the first conical surface 2120 and the second conical surface 221 abut against each other and are pressed together.

[0031] like Figure 1 As shown, the outer tube 22 extends axially outward at its outlet end to form an extension section 223. The inner diameter of the extension section 223 is smaller than the inner diameter of the outer tube 22 at the outlet end of the first tube section 211. The outer wall of the outlet end of the extension section 223 bulges outward to form a conical or spherical surface to facilitate sealing connection.

[0032] like Figure 2 As shown, the second end of the second pipe section 212 extending outside the outer pipe 22 is connected to the first inlet 23, which is used to introduce a mixture of inert gas and ultrapure water, such as argon. The interlayer cavity is connected to the second end of the second tube section 212, and a second inlet 24 is connected to it for introducing oxygen to ensure complete combustion of the sample. The second inlet 24 avoids the bulge 2121, and the pipe connected to the second inlet 24 has an angle that is inclined from bottom to top in the direction of airflow. This can guide the oxygen entering from the second inlet 24 to diffuse axially along the outer tube 22 and quickly reach the sample boat, which is beneficial to improving the completeness of combustion.

[0033] Work process First, check if the combustion tube is airtight. If it is airtight, initialize the equipment and preheat the combustion furnace to the working temperature. Operate the push rod to stop the end of the push rod in the sample boat chamber to facilitate the acquisition of the sample boat; Then, the first inlet 23 is opened, and a mixture of inert argon gas and ultrapure water is introduced into the inner tube 21. After a set time, the first inlet 23 is closed. At the same time, another stream of argon gas enters the inner tube 21 through the guide tube and the sample boat chamber. After a set time, the guide tube is closed. At the same time, the second inlet 24 is opened, and oxygen is introduced into the interlayer cavity to remove residual gas in the inner tube and the interlayer cavity. The push rod then acquires the sample boat and the sample inside. The sample boat moves forward and enters the highest temperature zone inside the combustion tube. The highest temperature zone inside the combustion tube corresponds to the location of the through holes on the first tube section 211. During this process, the sample undergoes preheating, heating, coking, and combustion stages. When the sample enters the highest temperature zone and begins to burn, the first inlet 23 is opened again. The mixture of argon and ultrapure water enters the inner tube 21, and another stream of oxygen enters the inner tube through the guide tube and the sample boat chamber. The second inlet 24 continuously supplies oxygen, which is beneficial for the complete combustion of the sample and improves the accuracy and stability of the online ion detection results. The pyrolysis gas from the combustion product then continues to diffuse forward and be discharged through the outlet end of the outer pipe 22 [A1].

[0034] The present invention has been described above by way of example, but the present invention is not limited to the specific embodiments described above. Any modifications or variations made based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A novel combustion tube for an online combustion ion chromatograph, the combustion tube passing through a combustion furnace and comprising an inner tube (21) and an outer tube (22), characterized in that, The inner tube (21) forms a through hollow cavity and includes a second tube section (212) and a first tube section (211) arranged axially along the airflow direction. A relatively closed interlayer cavity is formed between the inner tube (21) and the outer tube (22). The interlayer cavity is connected to the hollow cavity through several through holes (2111) on the first tube section (211). The second end of the second tube section (212) extending outside the outer tube (22) is connected to a first inlet (23). The interlayer cavity is connected to a second inlet (24) near the second end of the second tube section (212).

2. The novel combustion tube for an online combustion ion chromatograph according to claim 1, characterized in that, The first pipe section (211) is made of high-temperature resistant ceramic and is integrally formed.

3. The novel combustion tube for an online combustion ion chromatograph according to claim 2, characterized in that, The through holes (2111) are evenly arranged, and the positions of the through holes (2111) on the first tube section (211) are designed to correspond to the positions of the sample boats extending into the first tube section (211).

4. The novel combustion tube for an online combustion ion chromatograph according to claim 2, characterized in that, The outlet end of the first pipe section (211) away from the second pipe section (212) is axially connected to the inner wall of the outer pipe (22) through high temperature resistant filter cotton (25).

5. The novel combustion tube for an online combustion ion chromatograph according to claim 4, characterized in that, The outlet end of the first pipe section (211) is inserted into the reduced diameter section (222) at the corresponding position of the outer pipe (22), and the high temperature resistant filter cotton (25) is located at one end of the reduced diameter section (222). The inlet end of the first pipe section (211) is fitted into the outlet end of the second pipe section (212) and abuts against the end face formed by the expanded diameter section of the second pipe section (212).

6. The novel combustion tube for online combustion ion chromatography according to any one of claims 1 to 5, characterized in that, It also includes a clamping assembly (26), wherein the end of the second pipe section (212) away from the first pipe section (211) is sealed to the outer pipe (22) through face-to-face contact. The clamping assembly (26) is designed to axially clamp the inner pipe (21) and the outer pipe (22) to form a relatively closed interlayer cavity.

7. The novel combustion tube for an online combustion ion chromatograph according to claim 6, characterized in that, The second pipe section (212) is provided with a bulge (2121) on its outer sleeve. The outer wall surface of the bulge (2121) is formed with a first conical surface (2120). The inlet end of the outer pipe (22) corresponding to the position of the bulge (2121) is formed with a second conical surface (221) that cooperates with the first conical surface (2120). The second pipe section (212) and the outer pipe (22) are sealed by contact between the first conical surface (2120) and the second conical surface (221).

8. The novel combustion tube for an online combustion ion chromatograph according to claim 7, characterized in that, The clamping assembly (26) includes a plurality of first hook teeth (261) and a plurality of second hook teeth (262). The plurality of first hook teeth (261) are arranged circumferentially on the outer wall surface of the outer tube (22), and the plurality of second hook teeth (262) are arranged circumferentially on the outer wall surface of the bulge (2121) extending out of the outer tube (22). The first hook teeth (261) and the second hook teeth (262) are connected by an elastic element to axially clamp the inner tube (21) and the outer tube (22).

9. The novel combustion tube for an online combustion ion chromatograph according to claim 7, characterized in that, The second inlet (24) avoids the bulge (2121), and the pipe connected to the second inlet (24) has an angle that is inclined from bottom to top in the direction of airflow.

10. The novel combustion tube for online combustion ion chromatography according to any one of claims 7 to 9, characterized in that, The outer tube (22) extends axially outward at its outlet end to form an extension section (223). The outer wall of the outlet end of the extension section (223) bulges outward to form a conical or spherical surface to facilitate sealing connection.

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