Carrier gas purification device for gas chromatograph

Abstract

The carrier gas purification device comprises a machine body, a plurality of bin seats are arranged on the machine body, each bin seat is provided with a purification pipe, each purification pipe is provided with a gas inlet and a gas outlet, the rear end of the machine body is provided with a gas inlet control valve corresponding to each bin seat, and the gas inlet control valves are used for controlling gas to enter the corresponding purification pipes through the gas inlets. A converging pipe communicated with the gas inlet end of the gas chromatograph is arranged on one side of the machine body, a gas outlet channel communicated with the gas outlet of the purification pipe is further arranged in each bin seat, a gas outlet control valve is arranged on each gas outlet channel, the gas outlet channels are connected through a communicating pipe, the converging pipe is communicated with the communicating pipe, and the gas outlet control valve is arranged on the gas outlet channel. A plurality of switching control valves are arranged on the communicating pipe and used for controlling the communicating state between the adjacent air outlet channels. The device has the advantages that series-parallel working modes can be flexibly switched, different purification requirements are met, and the purification efficiency and the material utilization rate are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas detection, in particular to a carrier gas purification device for a gas chromatograph. Background Art

[0002] A gas chromatograph is an indispensable precision analytical instrument in modern analytical chemistry and industrial production, and is widely used in fields such as petrochemical industry, medicine, food safety, and environmental monitoring. The accuracy and repeatability of gas chromatographic analysis largely depend on the purity of the carrier gas, and the gas purification device is the key equipment to ensure the high purity of the carrier gas. High-purity carrier gas can significantly improve the resolution and detection sensitivity of chromatographic peaks, extend the life of the chromatographic column, reduce baseline drift, and is particularly important for trace analysis and high-sensitivity detection. Its performance and reliability are directly related to the quality of the analysis results and the use efficiency of the instrument.

[0003] At present, the common carrier gas purification devices for gas chromatographs on the market are mainly divided into two categories: series and parallel structures. The series purification device connects multiple purification columns with different functions (such as molecular sieve columns, activated carbon columns, oxygen absorbent columns, etc.) in sequence, and the carrier gas passes through each purification column in sequence to remove different types of impurities. This structure has good purification effect and high outlet purity, but has a large pressure drop and limited flow rate; the parallel purification device shunts the carrier gas and passes it through multiple parallel purification columns at the same time, and then combines and outputs the purified gas. This structure has a large flow rate and a small pressure drop, but the purification efficiency is relatively low. In addition, there are also some integrated purifiers on the market, which are filled with different purification materials in layers in a single cylinder, but the internal flow path still adopts a fixed series or parallel method. These devices usually use hard pipelines for external connection, control the gas flow direction through manual ball valves or needle valves, and most of them are fixed flow path designs. Once installed, it is difficult to change the flow path method.

[0004] In summary, the existing gas purification devices have the following main problems: First, the fixed series or parallel structure lacks flexibility and is difficult to balance the relationship between purification efficiency and flow rate requirements. Users must choose between high purity and large flow rate and cannot flexibly adjust according to different experimental requirements; Second, traditional purification devices generally lack the ability to switch flow paths, and cannot selectively bypass or recombine specific purification steps during use, resulting in all purification materials working simultaneously and their service lives being shortened synchronously, increasing the operating cost, and often requiring the entire system to be stopped when replacing a single purification material, affecting the continuity of the experiment. These problems limit the application effect of gas purification devices in modern analytical laboratories and are difficult to meet the increasing requirements for analysis accuracy and experimental efficiency. Summary of the Utility Model

[0005] The purpose of the present utility model is to provide a carrier gas purification device for a gas chromatograph, which can flexibly switch between series and parallel working modes, meet different purification requirements, and improve purification efficiency and material utilization rate.

[0006] To achieve the above object, the present utility model provides the following technical solution: A carrier gas purification device for a gas chromatograph, comprising a machine body, on which a plurality of chamber seats are provided, and a purification tube is installed on each chamber seat. The purification tube has an air inlet and an air outlet. At the rear end of the machine body, an inlet control valve is provided corresponding to each chamber seat for controlling the gas to enter the corresponding purification tube through the air inlet. A confluence tube connected to the air inlet end of the gas chromatograph is provided on one side of the machine body. An air outlet channel connected to the air outlet of the purification tube is further provided in each chamber seat, and an outlet control valve is provided on each air outlet channel. The plurality of air outlet channels are connected by a connecting tube, the confluence tube is connected to the connecting tube, and a plurality of switching control valves are provided on the connecting tube for controlling the connection state between adjacent air outlet channels.

[0007] Preferably, the purification tube has a storage cavity with an upward opening, and a purification substance is filled in the storage cavity. A cover is detachably provided at the top of the purification tube. A hollow central tube is further provided in the purification tube. The upper end of the central tube is fixedly connected with a diffuser hood. The air inlet is provided at the bottom of the purification tube and is communicated with the lower end of the central tube, and the air outlet is provided at the bottom of the purification tube and is communicated with the storage cavity.

[0008] Preferably, the diffuser hood is of a disc structure, its diameter is larger than that of the central tube, and a plurality of diffusion holes are evenly arranged in the circumferential direction at the upper end of the diffuser hood.

[0009] Preferably, the cover is installed at the top of the purification tube by means of threaded connection or snap connection, and a sealing ring is provided in the cover, and the sealing ring is located at the connection between the cover and the purification tube.

[0010] Preferably, three chamber seats are provided on the machine body for installing three purification tubes. The three purification tubes are respectively a hydrogen purification tube for purifying hydrogen, an air purification tube for purifying air, and a nitrogen purification tube for purifying nitrogen. Two switching control valves are provided on the connecting tube, which are respectively used for controlling the connection state between the hydrogen purification tube and the air purification tube and the connection state between the air purification tube and the nitrogen purification tube.

[0011] Preferably, a valve control unit is further provided in the machine body. The valve control unit is electrically connected to the inlet control valve, the outlet control valve and the switching control valve respectively for controlling the opening and closing states of the valves. An operation panel is provided on the front surface of the machine body, and the operation panel is electrically connected to the valve control unit.

[0012] Preferably, the valve control unit is provided with a variety of preset working modes, including single gas path mode, dual gas path mode and triple gas path mode; in the single gas path mode, only the inlet control valve and the outlet control valve corresponding to one of the purification tubes are opened, so that a single gas sequentially passes through the corresponding purification tube and the confluence tube and then is output; in the dual gas path mode, the inlet control valves and the outlet control valves corresponding to two of the purification tubes are opened simultaneously, and the corresponding switching control valves are opened, so that two gases are purified by their respective purification tubes and then converge and are output; in the triple gas path mode, the inlet control valves, the outlet control valves and the switching control valves corresponding to all the purification tubes are opened simultaneously, so that three gases are purified simultaneously and then converge and are output.

[0013] Compared with the prior art, the advantages of the present utility model are as follows: a plurality of bin seats are arranged on the body, and each bin seat is respectively installed with an independent purification tube for treating different types of carrier gases. Each purification tube is equipped with an independent inlet and an independent outlet to ensure that the gas can completely pass through the purification medium; the carrier gas first enters the corresponding purification tube through the inlet control valve located at the rear end of the body. The inlet control valve can control the start and stop of each gas path. The purified gas enters the outlet channel through the outlet. The outlet control valve on each outlet channel can independently control the opening and closing state of the outlet of each purification tube; the plurality of outlet channels are connected to each other through a cleverly designed connecting pipe, and the switching control valve on the connecting pipe realizes the connection or isolation function between adjacent gas paths; finally, all the purified gases are collected in the confluence tube on the side of the body and directly connected to the inlet end of the gas chromatograph.

[0014] The advantages of this design are as follows: it realizes the unified management and flexible combination of multiple carrier gases, and can either use a certain specific gas alone or use a combination of multiple gases simultaneously to meet different analysis requirements; all pipelines are hidden inside the body, reducing the risk points of leakage, improving the system safety and aesthetics; the modular design makes maintenance more convenient, and a single purification tube can be replaced without affecting the operation of other gas paths; at the same time, the compact layout and the integrated control system simplify the operation process, improve the experimental efficiency, and provide a stable and reliable carrier gas supply guarantee for gas chromatographic analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required to be used in the description of the embodiments. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0016] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0017] Figure 2 This is a schematic diagram of the gas circuit principle of the present utility model;

[0018] Figure 3 This is a schematic diagram of the circuit principle of the present utility model;

[0019] Figure 4 This is a three-dimensional structure schematic diagram of the body in the present utility model;

[0020] Figure 5 This is a three-dimensional structure schematic diagram of the purification tube in the present utility model;

[0021] Figure 6 This is a cross-sectional view of the purification tube in the present utility model;

[0022] Figure 7 This is a three-dimensional structure schematic diagram of the air diffuser in the present utility model;

[0023] In the figure, 1 is the body; 2 is the bin seat; 3 is the purification tube; 4 is the air inlet; 5 is the air outlet; 6 is the air inlet control valve; 7 is the confluence tube; 8 is the air outlet channel; 9 is the air outlet control valve; 10 is the connecting pipe; 11 is the switching control valve; 12 is the storage cavity; 13 is the purification substance; 14 is the cover; 15 is the central tube; 16 is the air diffuser; 17 is the air diffusion hole; 18 is the sealing ring; 19 is the valve control unit; 20 is the operation panel. Specific embodiments

[0024] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0025] Embodiment 1: As Figures 1-7 shown, a carrier gas purification device for a gas chromatograph includes a body 1, on which a plurality of bin seats 2 are provided, a purification tube 3 is installed on each bin seat 2, the purification tube 3 has an air inlet 4 and an air outlet 5, an air inlet control valve 6 is provided at the rear end of the body 1 corresponding to each bin seat 2 for controlling the gas to enter the corresponding purification tube 3 through the air inlet 4, a confluence tube 7 connected to the air inlet end of the gas chromatograph is provided on one side of the body 1, an air outlet channel 8 connected to the air outlet 5 of the purification tube 3 is further provided in each bin seat 2, an air outlet control valve 9 is provided on each air outlet channel 8, a plurality of air outlet channels 8 are connected through a connecting pipe 10, the confluence tube 7 is connected to the connecting pipe 10, and a plurality of switching control valves 11 are provided on the connecting pipe 10 for controlling the connection state between adjacent air outlet channels 8.

[0026] Embodiment 2: As Figures 1-7As shown, different from the first embodiment, the purification tube 3 has an upwardly open storage chamber 12, the storage chamber 12 is filled with a purification substance 13, a cover 14 is detachably provided on the top of the purification tube 3, a hollow central tube 15 is also provided in the purification tube 3, an air diffuser 16 is fixedly connected to the upper end of the central tube 15, an air inlet 4 is provided at the bottom of the purification tube 3 and is connected to the lower end of the central tube 15, and an air outlet 5 is provided at the bottom of the purification tube 3 and is connected to the storage chamber 12.

[0027] The purification tube 3 adopts an internal flow path structure to ensure that the gas fully contacts the purification material 13 to achieve the best purification effect. Its structure includes an upwardly open main storage chamber 12, which is filled with specific purification material 13 and is equipped with a detachable cover 14 on the top to facilitate regular replacement or replenishment of purification materials.

[0028] A hollow central tube 15 is arranged inside the purification tube 3, and an air diffusion hood 16 is connected to the upper end thereof, forming a unique gas flow path. The working principle is as follows: the gas to be purified first enters from the air inlet 4 at the bottom of the purification tube 3, and is directly connected to the lower end of the central tube 15. The gas flows upward along the central tube 15. When the gas reaches the top of the central tube 15, it is evenly diffused and distributed to the surroundings through the air diffusion hood 16. The disc-shaped design of the air diffusion hood 16 enables the gas to evenly pass through the surrounding purification material 13 layers to achieve sufficient contact and reaction. The purified gas flows downward under the action of gravity, and finally flows out through the air outlet 5 at the bottom of the purification tube 3.

[0029] This design has many significant advantages: the flow path is from bottom to top and then from top to bottom, which significantly prolongs the contact time between the gas and the purification material 13 and improves the purification efficiency; the design of the air diffuser 16 ensures that the gas is evenly dispersed, avoids short-circuiting in the gas flow, and fully utilizes the capacity of the purification material 13; the air inlet and outlet 5 are simultaneously arranged at the bottom of the purification tube 3, which simplifies the external connection and reduces the risk of leakage in the upper connection; the detachable top cover 14 design makes it simple and quick to replace the purification material 13 without disassembling the entire system; the installation and connection of the purification tube 3 at the bottom is convenient for fixing on the bin seat 2 and ensures air tightness, and the overall structure is compact and efficient.

[0030] In this embodiment, the air diffuser hood 16 is a disc structure, the diameter of which is larger than the diameter of the central tube 15 , and a plurality of air diffuser holes 17 are evenly opened in the circumferential direction at the upper end of the air diffuser hood 16 .

[0031] In the above structure, when the gas flows upward along the central tube 15 and reaches the top, it is first blocked by the inner top surface of the air diffuser 16 and the flow direction is changed. After being blocked, the gas diffuses to the surroundings. Since the diameter of the air diffuser 16 is larger than the central tube 15, a horizontal expansion area is formed, which initially reduces the air flow velocity. Then the gas is sprayed upward through a plurality of air expansion holes 17 evenly distributed circumferentially at the upper end of the air diffuser 16. These evenly distributed air expansion holes 17 ensure that the air flow is divided into multiple small air flows, achieving 360-degree all-round coverage on the horizontal section.

[0032] The advantages of this design are reflected in many aspects: the wide diameter of the air expansion hood 16 provides sufficient space for the initial diffusion of the gas, effectively reducing the air flow speed and preventing the gas from impacting the purification material 13 at high speed to form a fixed channel; the design of multiple air expansion holes 17 evenly distributed circumferentially divides the air flow into multiple uniform air flows, significantly increasing the contact area between the gas and the purification material 13 and avoiding the concentration of gas flow; the radial air flow distribution ensures that the gas can penetrate into the purification material 13 in various areas of the storage chamber 12, maximizing the use of the capacity of the purification medium and improving the purification efficiency.

[0033] In this embodiment, the sealing cover 14 is installed on the top of the purification tube 3 by means of threaded connection or snap connection. A sealing ring 18 is provided in the sealing cover 14 , and the sealing ring 18 is located at the connection between the sealing cover 14 and the purification tube 3 .

[0034] The cover 14 on the top of the purification tube 3 is designed with two optional installation methods: threaded connection or snap connection, which flexibly meets the needs of different use environments. At the same time, a sealing ring 18 is set inside the cover 14, which is precisely located at the connection between the cover 14 and the purification tube 3. This design has multiple advantages: the threaded connection method provides good fastening force and stability, ensuring that the cover 14 will not loosen during long-term use, which is suitable for working environments that need to withstand a certain pressure; and the snap connection provides the convenience of quick loading and unloading, greatly shortening the operation time of purification material replacement, which is suitable for frequent maintenance scenarios. The design of the built-in sealing ring 18 cleverly avoids the risk of exposure while ensuring airtightness, reducing the aging and damage of the sealing ring 18. The sealing ring 18 is positioned at the connection point to achieve point-to-point precise sealing and eliminate potential gas leakage hazards.

[0035] The overall design of the cover 14 allows operators to complete the replacement of purification materials without the help of professional tools, reducing maintenance costs and technical barriers. In addition, this detachable structure allows the purification tube 3 to be fully opened, which is convenient for thorough cleaning of internal residues and avoids cross contamination of different batches of purification materials. The material selection of the entire cover 14 component is reasonable, which not only ensures sufficient mechanical strength, but also has good corrosion resistance, and is suitable for the long-term use requirements of various carrier gases.

[0036] Example 3: As Figures 1-7 shown, different from Example 2, there are three bin seats 2 provided on the body 1 for installing three purification tubes 3. The three purification tubes 3 are respectively a hydrogen purification tube 3 for purifying hydrogen, an air purification tube 3 for purifying air, and a nitrogen purification tube 3 for purifying nitrogen. There are two switching control valves 11 provided on the connecting pipe 10, which are respectively used to control the connection state between the hydrogen purification tube 3 and the air purification tube 3 and the connection state between the air purification tube 3 and the nitrogen purification tube 3.

[0037] This gas chromatograph carrier gas purification device adopts a three-bin seat 2 design, specifically installing three purification tubes 3 with different functions, and respectively purifying the three most commonly used carrier gases in gas chromatography analysis: hydrogen, air, and nitrogen. The hydrogen purification tube 3 is filled with a highly active metal oxide catalyst, mainly copper oxide or palladium-based catalyst, which can efficiently catalyze the reaction of trace oxygen in hydrogen with hydrogen to generate water at room temperature, and adsorb the generated moisture through the subsequent molecular sieve layer to ensure the high purity of hydrogen and prevent oxidative damage to the chromatographic column. The air purification tube 3 adopts a multi-layer composite filling design of molecular sieve and activated carbon. The molecular sieve mainly adsorbs moisture and carbon dioxide in the air, and the activated carbon effectively removes various organic pollutants and odor substances to ensure that the air as the carrier gas or auxiliary gas does not introduce interference peaks. The nitrogen purification tube 3 is filled with a special copper-based deoxidizer, and this material can effectively remove moisture in combination with a desiccant layer used at room temperature to provide a high-purity inert carrier gas environment.

[0038] The two switching control valves 11 provided on the connecting pipe 10, one controls the connection state between the hydrogen purification tube 3 and the air purification tube 3, and the other controls the connection state between the air purification tube 3 and the nitrogen purification tube 3, forming a flexible control network in a linear arrangement. This design enables the system to not only maintain the independent working ability of each purification tube 3 but also realize the combined application of multiple gases. For example, hydrogen can be used alone as the carrier gas, or only the combination of nitrogen and air can be used, or all three gases can be used simultaneously to meet the specific requirements of different detection methods. The compact layout of the three-bin seat 2 optimizes the space utilization rate of the equipment, reduces the overall volume of the body 1, and is convenient for laboratory installation. The linear arrangement connection method simplifies the pipeline design, reduces the turning points of gas flow, and reduces the pressure loss.

[0039] In this embodiment, a valve control unit 19 is further provided inside the body 1. The valve control unit 19 is electrically connected to the intake control valve 6, the outlet control valve 9, and the switching control valve 11 respectively for controlling the opening and closing states of each valve. An operation panel 20 is provided on the front of the body 1, and the operation panel 20 is electrically connected to the valve control unit 19.

[0040] The control unit controls various types of valves through electrical connections. Among them, the intake control valve 6, the exhaust control valve 9, and the switching control valve 11 all adopt high-precision solenoid valves, which have the characteristics of fast response speed and long service life, and can realize the on-off control of the gas path within milliseconds. The valve control unit 19 adopts an electronic control system with a microprocessor as the core, which can accurately control the on-off state, opening sequence, and duration of each valve to ensure the accurate establishment and switching of the gas flow path. The operation panel 20 provided on the front of the body 1 provides an intuitive and convenient human-machine interaction interface. Through the electrical connection with the valve control unit 19, the accurate transmission of operation instructions is realized.

[0041] In this embodiment, the valve control unit 19 is provided with multiple preset working modes, including single gas path mode, dual gas path mode, and triple gas path mode. In the single gas path mode, only the intake control valve 6 and the exhaust control valve 9 corresponding to one purification tube 3 are opened, so that a single gas passes through the corresponding purification tube 3 and the confluence tube 7 in sequence and then is output. In the dual gas path mode, the intake control valves 6 and the exhaust control valves 9 corresponding to two purification tubes 3 are opened simultaneously, and the corresponding switching control valves 11 are opened, so that two gases are purified by their respective purification tubes 3 and then merged and output. In the triple gas path mode, the intake control valves 6, the exhaust control valves 9, and the switching control valves 11 corresponding to all purification tubes 3 are opened simultaneously, so that three gases are purified simultaneously and then merged and output.

[0042] The valve control unit 19 of the carrier gas purification device of this gas chromatograph adopts an intelligent design, presetting three working modes to adapt to different analysis requirements, and realizing a high degree of flexibility and convenience in the use of the carrier gas.

[0043] The single gas path mode is designed specifically for the analysis requirements of a single carrier gas. In this mode, the valve control unit 19 only opens the intake control valve 6 and the exhaust control valve 9 corresponding to a specific purification tube 3, and closes all the switching control valves 11 at the same time. After a single gas (such as hydrogen, air, or nitrogen) is purified by the corresponding dedicated purification tube 3, it is directly output to the gas chromatograph through the confluence tube 7. In this mode, the system gas path is simple and direct, and the pressure loss is small, which is suitable for analysis methods with high purity requirements for a specific carrier gas, such as rapid analysis using high-purity hydrogen as the carrier gas or conventional analysis using nitrogen as the carrier gas.

[0044] The dual-gas path mode is applicable to scenarios where two gases need to be used in combination. The valve control unit 19 will simultaneously open the inlet control valves 6 and the outlet control valves 9 of two selected purification tubes 3, and open the switching control valve 11 between these two purification tubes 3, so that the two gases (such as hydrogen and air, or air and nitrogen) are purified through dedicated purification tubes 3 respectively and then converge in the connecting tube 10, and then are jointly output through the converging tube 7. This mode is particularly suitable for gas chromatography analysis methods that require a combination of carrier gas and combustion-supporting gas, such as the flame ionization detector application using hydrogen as the carrier gas and air as the combustion-supporting gas, or a specific detection method using nitrogen as the carrier gas and air as the auxiliary gas.

[0045] The triple-gas path mode is the full-function mode of the system. The valve control unit 19 simultaneously opens the inlet control valves 6 and the outlet control valves 9 of all purification tubes 3, as well as all switching control valves 11, so that hydrogen, air and nitrogen are purified through their respective dedicated purification tubes 3 and then converge and output. In this mode, the system can simultaneously provide multiple high-purity gases to meet the most complex gas chromatography analysis requirements, such as a multi-detector system using different types of carrier gases at the same time, or a special analysis method that requires the joint participation of carrier gas, combustion-supporting gas and auxiliary gas.

[0046] The design of these three preset working modes greatly simplifies the user operation. The operator only needs to select the required mode through the mode selection button on the operation panel 20, and the system can automatically configure the states of all valves without manually adjusting each valve. At the same time, this modular design ensures the correctness and consistency of the gas path configuration, avoids the risks brought by human operation errors, and improves the reliability and repeatability of the analysis results.

[0047] The above description is only the implementation mode of this application, and does not limit the patent scope of this application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of this application, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of this application by the same token.

Claims

1. A carrier gas purification device for a gas chromatograph, comprising a body, wherein a plurality of chamber seats are arranged on the body, and a purification tube is installed on each chamber seat. The purification tube has an air inlet and an air outlet, and is characterized in that: An intake control valve is provided at the rear end of the body corresponding to each of the storage seats, for controlling the gas to enter the corresponding purification pipe through the intake port. A confluence pipe communicating with the intake end of the gas chromatograph is provided on one side of the body. An air outlet channel communicating with the air outlet of the purification pipe is further provided in each of the storage seats. An air outlet control valve is provided on each of the air outlet channels. A plurality of the air outlet channels are connected by a communication pipe. The confluence pipe is connected to the communication pipe. A plurality of switching control valves are provided on the communication pipe, for controlling the connection state between adjacent air outlet channels.

2. The carrier gas purification device for a gas chromatograph according to claim 1, wherein: The purification pipe has a storage cavity with an upward opening. The storage cavity is filled with a purification substance. A cover is detachably provided at the top of the purification pipe. A hollow central pipe is further provided in the purification pipe. The upper end of the central pipe is fixedly connected with a diffuser hood. The intake port is provided at the bottom of the purification pipe and communicates with the lower end of the central pipe. The air outlet is provided at the bottom of the purification pipe and communicates with the storage cavity.

3. The carrier gas purification device for a gas chromatograph according to claim 2, wherein: The diffuser hood is of a disc structure, with a diameter larger than that of the central pipe, and a plurality of diffuser holes are evenly formed in the circumferential direction at the upper end of the diffuser hood.

4. The carrier gas purification device for a gas chromatograph according to claim 2, characterized in that: The cover is installed at the top of the purification pipe by means of threaded connection or snap connection. A sealing ring is provided in the cover, and the sealing ring is located at the connection between the cover and the purification pipe.

5. The carrier gas purification device for a gas chromatograph according to claim 1, characterized in that: Three storage seats are provided on the body for installing three purification pipes. The three purification pipes are respectively a hydrogen purification pipe for purifying hydrogen, an air purification pipe for purifying air, and a nitrogen purification pipe for purifying nitrogen. Two of the switching control valves are provided on the communication pipe, respectively for controlling the connection state between the hydrogen purification pipe and the air purification pipe and the connection state between the air purification pipe and the nitrogen purification pipe.

6. The carrier gas purification device for a gas chromatograph according to claim 1, characterized in that: A valve control unit is further provided in the body. The valve control unit is electrically connected to the intake control valve, the air outlet control valve, and the switching control valve respectively, for controlling the opening and closing states of the valves. An operation panel is provided on the front surface of the body, and the operation panel is electrically connected to the valve control unit.

7. The carrier gas purification device for a gas chromatograph according to claim 6, characterized in that: The valve control unit is provided with a variety of preset working modes, including a single gas path mode, a double gas path mode, and a triple gas path mode. In the single gas path mode, only the intake control valve and the air outlet control valve corresponding to one of the purification pipes are opened, so that a single gas passes through the corresponding purification pipe and the confluence pipe in sequence and then is output. In the double gas path mode, the intake control valves and the air outlet control valves corresponding to two of the purification pipes are opened simultaneously, and the corresponding switching control valves are opened, so that two gases are purified by their respective purification pipes and then converge and output. In the triple gas path mode, the intake control valves, the air outlet control valves, and the switching control valves corresponding to all the purification pipes are opened simultaneously, so that three gases are purified simultaneously and then converge and output.

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