Gas chromatographic column oven for high-purity helium

Abstract

The utility model belongs to the technical field of gas chromatographs, and particularly relates to a gas chromatographic column oven for high-purity helium, which comprises an oven body, a gas inlet and a gas outlet are arranged at the top of the oven body, and a plurality of mounting plates are mounted in the oven body; a section of chromatographic column is mounted on each mounting plate, each section of chromatographic column is provided with a gas inlet interface and a gas outlet interface, and the gas inlet is connected with the gas inlet interface of the lowest chromatographic column; a communicating pipe is mounted at the air outlet, a first electromagnetic valve is mounted on each connector pipe, and a plurality of second electromagnetic valves are mounted on the communicating pipe; and a heating assembly is mounted on each mounting plate. According to the gas chromatographic column incubator for the high-purity helium provided by the utility model, the plurality of sections of chromatographic columns, the communicating pipe, the first electromagnetic valve and the second electromagnetic valve are arranged, so that different gases can be measured through adjustment of the controller without replacing the chromatographic columns and changing the working lengths of the chromatographic columns, and the operation is simple and convenient; and no adverse effect is generated on a chromatographic column.

Description

Technical Field

[0001] This utility model belongs to the field of gas chromatography technology, specifically relating to a gas chromatography column oven for high-purity helium. Background Technology

[0002] The gas chromatography column oven is one of the core components of a gas chromatography analysis system, playing a crucial role. This oven allows for the adjustment of the column's operating temperature, typically ranging from room temperature to several hundred degrees Celsius. Temperature control ensures effective sample separation and reproducibility within the column, thereby improving the accuracy and reliability of the analysis. Furthermore, the oven's design incorporates excellent thermal stability and insulation properties, effectively preventing temperature fluctuations from interfering with the analytical results.

[0003] In the BOG helium extraction process, the analysis of the product gas is crucial. After multiple analyses of the product gas and standard gas, it was found that the Ne results fluctuated greatly, and re-analysis was usually performed after 1-2 days. The automatic cutoff of the Ne peak was incomplete, and the Ne peak and hydrogen peak were too close together. Even manual cutoff was difficult to separate the Ne peak and hydrogen peak, resulting in large variations in the Ne results. In response, the existing utility model with the technical publication number CN220120785U discloses a gas chromatograph homogenizing column oven, which relates to the field of gas chromatograph technology. It includes: a box body, an electric heating element and a chromatographic column are arranged inside the box body, a circulating fan is arranged on the top of the box body, a collection chamber is fixedly connected to the top of the box body, a left chamber is fixedly connected to the left side of the box body, a right chamber is fixedly connected to the right side of the box body, a bottom chamber is fixedly connected to the bottom of the box body, and a door is rotatably connected to the front of the box body. The system, with its collection chamber, right chamber, bottom chamber, left chamber, and circulating fan, allows for heat circulation within the chamber, enabling the high-heat air at the top to be transported to the bottom, thereby increasing the heat retention time and improving the heating effect. It is very convenient to use and, to some extent, extends the elution time of the Ne and hydrogen peaks. However, the peak shifting effect is still not ideal, requiring manual replacement with a longer column. During the replacement process, improper operation can lead to column damage or unstable installation, and the operation is quite cumbersome. Utility Model Content

[0004] The purpose of this invention is to provide a gas chromatography column oven for high-purity helium to solve the problems mentioned in the background art.

[0005] To achieve the above-mentioned technical objectives, the technical solution of this utility model is as follows:

[0006] A gas chromatography column oven for high-purity helium includes a chamber with an inlet and an outlet at the top. Several vertically aligned mounting plates are installed inside the chamber. Each mounting plate has a chromatographic column section, each section having an inlet and an outlet. The inlet is located at the bottom of the column, and the outlet is located at the top. The inlet is connected to the inlet of the lowest column. A vertically aligned connecting pipe is installed at the outlet. The outlet of the lowest column is connected to the inlet and outlet of the remaining columns by interface pipes arranged sequentially from bottom to top, according to their vertical arrangement. Each interface pipe is equipped with a first solenoid valve, and several second solenoid valves are installed on the connecting pipes, located between the interface pipes connecting the inlet and outlet of each column. A heating element is installed on each mounting plate.

[0007] As an improvement, the heating assembly includes an electric heating block, which is fixedly connected to the mounting plate. A heat-conducting rod is fixedly connected to the electric heating block, and a heat-conducting cylinder is fixedly connected to the heat-conducting rod. The heat-conducting cylinder is cylindrical and is fixedly connected to the mounting plate.

[0008] As an improvement, the outer edge of the mounting plate is equipped with several mounting rods, which are snapped into heat insulation covers, and the heat insulation covers are provided with holes for the chromatographic column to pass through.

[0009] As an improvement, the diameter of the heat-conducting cylinder is smaller than the diameter of the chromatographic column, the diameter of the heat insulation cover is larger than the diameter of the chromatographic column, and the chromatographic column is installed between the heat-conducting cylinder and the heat insulation cover.

[0010] As an improvement, a temperature sensor is mounted on the mounting plate, and the temperature sensor is electrically connected to a controller, which is fixedly connected to the housing.

[0011] As an improvement, the controller is electrically connected to the electric heating block, the first solenoid valve, and the second solenoid valve.

[0012] As an improvement, the box body has an opening on one side, and a viewing door is hinged to the opening side of the box body.

[0013] Due to the adoption of the above technical solution, the beneficial effects of this utility model are as follows:

[0014] The high-purity helium gas chromatography column oven provided by this utility model, by setting up several sections of chromatographic column, connecting tube, first solenoid valve and second solenoid valve, can achieve the goal of changing the working length of chromatographic column without replacing the chromatographic column. When measuring different gases, it can be adjusted by the controller. The operation is simple and convenient, and will not have an adverse effect on the chromatographic column. It separates the elution time of Ne peak and hydrogen peak, so that the peak staggering effect achieves the expected goal. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the heating component structure of this utility model.

[0018] The components are as follows: 1. Air inlet; 2. Connecting pipe; 3. Air outlet; 4. Hose; 5. Second solenoid valve; 6. First solenoid valve; 7. Air inlet; 8. Heat insulation cover; 9. Controller; 10. Air outlet; 11. Mounting rod; 12. Mounting plate; 13. Chromatographic column; 14. Heat-conducting cylinder; 15. Temperature sensor; 16. Heat-conducting rod; 17. Electric heating block; 18. Box body. Detailed Implementation

[0019] The present invention will be further described below with reference to specific embodiments and accompanying drawings. The accompanying drawings are for illustrative purposes only, representing schematic diagrams only, not actual physical objects, and should not be construed as limiting the scope of this application. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0020] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0021] like Figure 1-3As shown, a gas chromatography column 13 oven for high-purity helium includes a chamber 18. The top of the chamber 18 is provided with an inlet 1 and an outlet 10. The carrier gas of the chromatograph can enter the chamber 18 through the inlet 1, and the carrier gas entering the chamber 18 can flow to the detector through the outlet 10. Two or more mounting plates 12 are installed inside the chamber 18, arranged vertically. A gap is left between every two adjacent mounting plates 12. Each mounting plate 12 is equipped with a section of chromatographic column 13. Each section of chromatographic column 13 is provided with an inlet port and an outlet port. The inlet port is located at the bottom of the chromatographic column 13, and the outlet port is located at the top of the chromatographic column 13.

[0022] A vertically arranged connecting pipe 2 is installed at the outlet 10. The connecting pipe 2 is located inside the housing 18. The top of the connecting pipe 2 is connected to the outlet 10, and the bottom of the connecting pipe 2 is connected to the inlet 1 via a flexible hose 4. The connecting pipe 2 has two or more sets of connecting interfaces that mate with the inlet and outlet interfaces. Each set of connecting interfaces includes an inlet connecting port 7 and an outlet connecting port 3. Both the inlet connecting port 7 and the outlet connecting port 3 are fixedly connected to the connecting pipe 2. The inlet connecting port 7 is connected to the chromatograph. The inlet port of column 13 corresponds to the outlet port 3, and the inlet port 7 of each set of connecting ports is located below the outlet port 3. The inlet port and outlet port of column 13 are connected to the inlet port 7 and outlet port 3 one by one from bottom to top. Specifically, the inlet port and outlet port are connected to the connecting pipe 2 through a threaded structure. The first solenoid valve 6 and the second solenoid valve 5 are used to open and close the pipeline. The two valves work together to control the flow direction and path of the carrier gas.

[0023] Each mounting plate 12 is equipped with a heating component, which is used to heat the ambient temperature of the chromatographic column 13, so that the ambient temperature of the chromatographic column 13 is suitable and the chromatographic column 13 can work normally.

[0024] In this embodiment, for different gases to be detected, the direction and path of the carrier gas can be controlled by adjusting the first solenoid valve 6 and the second solenoid valve 5. This allows the carrier gas to pass through several sections of the chromatographic column 13 before reaching the outlet 10. During use, different total lengths of chromatographic columns 13 can be used for different substances to be detected, eliminating the need to replace columns 13 of different lengths. This avoids adverse effects such as damage or contamination of the chromatographic column 13 during replacement. In the analysis of product gas in the BOG helium extraction process, the peak times of the Ne peak and the hydrogen peak can be separated, resulting in a significant peak staggering effect.

[0025] When only one segment of the chromatographic column 13 needs to pass through, the first valve on the outlet port of one segment of the chromatographic column 13 needs to be opened, and the other first valves need to be closed. The second valve corresponding to this segment of the chromatographic column 13 on the connecting pipe 2 needs to be closed, and all the other second valves on the connecting pipe 2 need to be opened. Then the carrier gas only passes through this segment of the chromatographic column 13. When several segments of the chromatographic column 13 need to pass through, the first valves connected to several segments of the chromatographic column 13 need to be opened, the second valves corresponding to several segments of the chromatographic column 13 need to be closed, the other first valves need to be closed, and the other second valves need to be opened. Then the carrier gas will pass through several segments of the chromatographic column 13.

[0026] The heating assembly includes an electric heating block 17, which is fixedly connected to a mounting plate 12. A heat-conducting rod 16 is fixedly connected to the electric heating block 17, and a heat-conducting cylinder 14 is fixedly connected to the heat-conducting rod 16. The heat-conducting cylinder 14 is cylindrical and fixedly connected to the mounting plate 12. The diameter of the heat-conducting cylinder 14 is smaller than the diameter of the chromatographic column 13, and the chromatographic column 13 is located outside the heat-conducting cylinder 14. Specifically, both the heat-conducting rod 16 and the heat-conducting cylinder 14 are made of materials with good thermal conductivity. Several heat-conducting rods 16 can be provided, and the number of heat-conducting rods 16 can be set according to their effect on transferring heat to the heat-conducting cylinder 14, so that the heat generated by the electric heating block 17 can be transferred to the heat-conducting cylinder 14 quickly enough, resulting in a better heating effect.

[0027] Several mounting rods 11 are installed on the outer edge of the mounting plate 12. The mounting rods 11 are snapped into heat insulation covers 8. The heat insulation covers 8 have holes for the chromatographic column 13 to pass through. The diameter of the heat insulation covers 8 is larger than the diameter of the chromatographic column 13. The chromatographic column 13 is located inside the heat insulation covers 8. Specifically, both the heat insulation covers 8 and the mounting plate 12 are made of heat insulation material, which is used to retain as much heat as possible in the heat insulation covers 8 to avoid energy loss, so that the heating effect of the heating components on the chromatographic column 13 is good, and the snap-fit ​​connection is convenient for installation and removal.

[0028] A temperature sensor 15 is mounted on the mounting plate 12. The temperature sensor 15 is electrically connected to a controller 9, which is fixedly connected to the housing 18. The controller 9 is also electrically connected to the electric heating block 17 and a solenoid valve. The temperature sensor 15 can detect the temperature of the environment where the chromatographic column 13 is located in real time and transmit the detected data to the controller 9. The heating efficiency of the electric heating block 17 can be adjusted according to the temperature detected by the controller 9.

[0029] An opening is provided on one side of the enclosure 18, and a viewing door is hinged to the opening side of the enclosure 18. Specifically, a sealing gasket is installed between the enclosure 18 and the viewing door. The sealing and opening of the enclosure 18 can be controlled by opening and closing the viewing door. The sealing gasket makes the sealing effect better when closed, which can prevent heat loss and impurities from entering.

[0030] In summary, in actual use, the viewing door is opened, several sections of the chromatographic column 13 are installed on the mounting plate 12, and then the inlet and outlet ports of the chromatographic column 13 are connected to the corresponding positions. The heat insulation cover 8 is installed, the viewing door is closed, and the electric heating block 17 corresponding to the chromatographic column 13 is controlled by the controller 9 to heat it according to the required chromatographic column 13. When the preset temperature is reached, the carrier gas is controlled to enter the chamber 18, and the carrier gas is controlled to pass through the corresponding chromatographic column 13 by controlling the first solenoid valve 6 and the second solenoid valve 5. After the carrier gas is separated in the chromatographic column 13, it is discharged out of the chamber 18 through the outlet 10 and delivered to the detector for detection.

[0031] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A gas chromatographic column oven for high purity helium, comprising an oven body (18) provided with a gas inlet (1) and a gas outlet (10) at the top thereof, characterized in that, Two or more mounting plates (12) are arranged vertically in the box (18), and each mounting plate (12) is provided with a chromatographic column (13), each chromatographic column (13) is provided with an air inlet and an air outlet, the air inlet is located at the bottom end of the chromatographic column (13), and the air outlet is located at the top end of the chromatographic column (13); The air outlet (10) is provided with a vertical communication pipe (2), the communication pipe (2) is located in the box (18), the top of the communication pipe (2) is communicated with the air outlet (10), the bottom of the communication pipe (2) is communicated with the air inlet (1) through a hose (4), and two or more sets of communication interfaces matched with the air inlets and air outlets are arranged on the communication pipe (2), each set of communication interfaces comprises an air inlet communication port (7) and an air outlet communication port (3), the air inlet communication port (7) corresponds to the air inlet of the chromatographic column (13), the air outlet communication port (3) corresponds to the air outlet of the chromatographic column (13), the air inlet communication port (7) of each set of communication interfaces is located below the air outlet communication port (3), and the air inlets and air outlets of the chromatographic column (13) are sequentially connected with the air inlet communication port (7) and the air outlet communication port (3) from bottom to top. A first electromagnetic valve (6) is arranged on each communication interface, and a second electromagnetic valve (5) is arranged between the air inlet communication port (7) and the air outlet communication port (3) of each set of communication interfaces on the communication pipe (2). Each mounting plate (12) is provided with a heating assembly.

2. The gas chromatography oven for high purity helium gas according to claim 1, characterized by, The heating assembly comprises an electric heating block (17), the electric heating block (17) is fixedly connected with the mounting plate (12), the electric heating block (17) is fixedly connected with a heat conduction rod (16), the heat conduction rod (16) is fixedly connected with a heat conduction cylinder (14), the heat conduction cylinder (14) is fixedly connected with the mounting plate (12), the diameter of the heat conduction cylinder (14) is smaller than the diameter of the chromatographic column (13), and the chromatographic column (13) is located outside the heat conduction cylinder (14).

3. The gas chromatography oven for high purity helium according to claim 2, characterized in that, A plurality of mounting rods (11) are arranged on the outer edge of the mounting plate (12), the mounting rods (11) are clamped with a heat shield (8), the diameter of the heat shield (8) is greater than the diameter of the chromatographic column (13), the chromatographic column (13) is located inside the heat shield (8), and the heat shield (8) is provided with a hole through which the chromatographic column (13) passes.

4. The gas chromatography oven for high purity helium gas according to claim 3, characterized by A temperature sensor (15) is arranged on the mounting plate (12), the temperature sensor (15) is electrically connected with a controller (9), the controller (9) is fixedly connected with the box (18), and the controller (9) is electrically connected with the electric heating block (17), the first electromagnetic valve (6) and the second electromagnetic valve (5).

5. The gas chromatography oven for high purity helium gas according to claim 1, wherein An opening is arranged on one side of the box (18), and a visual door is hingedly connected to the opening side of the box (18).

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