Gas Chromatograph

Abstract

The present invention discloses a gas chromatograph, comprising a housing, a carrier gas supply unit, a sampling unit, a separation unit and a liquid heating unit arranged in the housing. The separation unit comprises a substrate and a plurality of chromatographic column modules, and a plurality of mutually independent mounting cavities are formed on the substrate. A joint assembly is arranged on the side wall of each of the mounting cavities, and a heating layer is arranged on the substrate on one side of the plurality of mounting cavities, and a cavity for storing a heat-insulating liquid is formed in the heating layer, and the cavity comprises a plurality of sub-channels corresponding to each mounting cavity and being mutually independent, and the inlet and outlet of each of the sub-channels are respectively connected with the pipeline of the liquid heating unit and form a circulation loop. The structure can be used to facilitate the installation of the chromatographic column module, especially when the chromatographic column module needs to be replaced, which is conducive to improving the work efficiency, and because the heat-insulating liquid has a good constant temperature effect, the heat-insulating effect of the chromatographic column module can be guaranteed, which provides a guarantee for the experiment and ensures the accuracy of the temperature control of the chromatographic column module.

Description

Technical Field

[0001] The present invention relates to the technical field of chromatographs, and in particular to a gas chromatograph. Background Art

[0002] Gas chromatograph is an instrument that uses chromatographic separation technology and detection technology to perform qualitative and quantitative analysis on complex mixtures of multiple components. When in use, the sample to be analyzed is vaporized in the injection port and carried into the chromatographic column by the carrier gas. The components are separated by the chromatographic column with different retention properties for the components in the mixture to be detected, and then introduced into the detector in sequence to obtain the detection signal of each component. According to the order of introduction into the detector, after comparison, the components can be distinguished, and the content of each component can be calculated based on the peak height or peak area.

[0003] However, for some analytical samples, the required chromatographic column length is relatively long during the analysis process, and the temperature requirement is relatively high. The temperature required for separation must be accurately controlled in the chromatographic column chamber. When the sample is complex, the temperature of the separation chamber needs to be controlled according to a certain procedure, and each component is separated at the optimal temperature; the detector must allow the separated components to pass through without condensing. One type of gas chromatograph in the prior art is heated by an additional heating plate, and another type is heated by hot air. However, these two types of gas chromatographs are difficult to control when they need to be kept at a constant temperature during use, especially for capillary chromatographic columns. Due to their usually large length, they are more prone to local temperature unevenness, which affects the test results.

[0004] Therefore, the gas chromatograph in the prior art has the problem of great difficulty in temperature control, which affects the overall performance. Summary of the invention

[0005] The purpose of the present invention is to solve the problem in the prior art that the temperature control of a gas chromatograph is difficult and affects the overall performance.

[0006] In order to solve the above technical problems, the embodiment of the present invention discloses a gas chromatograph, comprising a housing, a carrier gas supply unit, a sampling unit, a separation unit and a liquid heating unit arranged in the housing; wherein,

[0007] The separation unit comprises a base body and a plurality of chromatographic column modules, wherein a plurality of mutually independent mounting cavities are formed on the base body, and the plurality of chromatographic column modules are detachably mounted on the corresponding mounting cavities respectively; and

[0008] A connector assembly is provided on the side wall of each installation cavity, and the connector assembly is configured with a first connector, a second connector and a third connector, the first connector can be selectively connected to the second connector or the third connector, and the first connector is connected to the corresponding gas inlet pipeline of the chromatographic column module, the second connector is connected to the carrier gas supply unit pipeline, and the third connector is connected to the separation unit pipeline; and,

[0009] A heating layer is provided on the base at one side of the plurality of installation cavities, and a cavity for storing insulation liquid is formed in the heating layer. The cavity includes a plurality of sub-channels corresponding to each of the installation cavities and independent of each other, and the inlet and outlet of each of the sub-channels are respectively connected to the pipeline of the liquid heating unit to form a circulation loop.

[0010] By adopting the above technical solution, the chromatograph in this embodiment is provided with a plurality of installation cavities on the base body, and a joint assembly is provided on the installation cavity. During installation, it is only necessary to install the chromatographic column module in the installation cavity, and complete the connection work between the first joint and the corresponding air inlet pipeline of the chromatographic column module to realize the connection between the chromatographic column module and the chromatographic pipeline system. The use of this structure can facilitate the installation of the chromatographic column module, especially when the chromatographic column module needs to be replaced, which is conducive to improving work efficiency.

[0011] In addition, a heating layer is provided on one side of the plurality of installation cavities, and a cavity for storing insulation liquid is formed in the heating layer. The cavity includes a plurality of sub-channels corresponding to and independent of each other in the installation cavities. The sub-channels can be used to store insulation liquid, and the chromatographic column module is heated by the insulation liquid. Since the insulation liquid has a good constant temperature effect, the insulation effect of the chromatographic column module can be guaranteed, thereby providing a guarantee for the experiment. Each installation cavity is equipped with a separate sub-channel, thereby ensuring the accuracy of temperature control of each chromatographic column module.

[0012] Therefore, the gas chromatograph provided in this embodiment can improve work efficiency while ensuring the accuracy of temperature control of the chromatographic column module, thereby reducing the impact of temperature on experimental data.

[0013] Another gas chromatograph disclosed in an embodiment of the present invention further includes a control unit, and a flow control component is connected to the pipeline at the inlet of each sub-channel, and the signal output end of the control unit is respectively communicated with the signal input end of the carrier gas supply unit, the signal input end of the injection unit, the signal input end of the liquid heating unit and the signal input end of the flow control component; and

[0014] The control unit is preset with an associated information table, which includes associated information of sample type-heating temperature. The control unit generates rated temperature information of the corresponding sample according to the associated information of sample type-heating temperature, and controls the working state of the liquid heating unit and the flow control component according to the rated temperature information.

[0015] By adopting the above technical solution, the insulation liquid in each sub-channel can be accurately controlled by setting a flow control component, and the control unit is preset with a related information table. When the user, the control unit can call the corresponding rated temperature information according to the sample gas, and open or close the heating unit and the corresponding flow control component according to the corresponding rated temperature information. This process does not require the staff to make a secondary judgment, which can reduce the labor intensity of the staff.

[0016] According to another gas chromatograph disclosed in an embodiment of the present invention, a temperature detection module is further provided in each installation cavity, at least a monitoring probe of the temperature detection module is provided in the sub-channel, and the temperature detection module is used to monitor the temperature of the insulation liquid stored in each sub-channel and generate real-time temperature information; wherein,

[0017] The signal input end of the control unit is connected to the signal output end of the temperature detection module for communication, and the real-time temperature information is obtained; wherein,

[0018] When the control unit determines that the gas volume information is greater than or equal to a preset gas volume threshold and the real-time temperature information is lower than the rated temperature information, the control unit controls the heating unit and the corresponding flow control member to open;

[0019] When the control unit determines that the gas volume information is greater than or equal to the preset gas volume threshold and the real-time temperature information is greater than or equal to the rated temperature information, the control unit controls the heating unit to turn on and the corresponding flow control component to turn off;

[0020] The control unit determines that the gas quantity information is less than a preset gas quantity threshold, and the control unit controls the heating unit to be turned off and the corresponding flow control component to be turned off.

[0021] By adopting the above technical solution, a temperature detection module is set up. Since the temperature detection module can monitor the temperature of the insulation liquid stored in each sub-channel in real time, the control unit can accurately obtain the temperature of each chromatographic column module, and control the working status of the heating unit and the corresponding flow control component in real time according to the real-time temperature information, thereby further ensuring the accuracy of temperature control of each chromatographic column module.

[0022] According to another gas chromatograph disclosed in an embodiment of the present invention, each connector assembly on the installation cavity has a solenoid valve, which controls the first connector to selectively communicate with the second connector or the third connector, and the chromatographic column module is provided with a gas volume monitoring module, which is used to monitor the sample gas volume in the chromatographic column module and generate corresponding gas volume information; wherein,

[0023] The signal input end of the control unit is communicatively connected with the signal output end of the gas quantity monitoring module, and the signal output end of the control unit is communicatively connected with the signal input end of the solenoid valve of each of the connector assemblies; when the control unit obtains the gas quantity information in real time and determines that the gas quantity information is greater than or equal to a preset gas quantity threshold, the control unit controls the solenoid valve so that the first connector and the second connector are closed, and the first connector and the third connector are connected.

[0024] By adopting the above technical solution, a gas quantity monitoring module is set up. During the sample air intake stage, the gas quantity monitoring module is used to monitor the sample gas quantity in the chromatographic column module, so that the control unit can obtain the corresponding gas quantity information in time and control the state of the solenoid valve according to the gas quantity information, thereby reducing the probability of excessive or insufficient sample air intake affecting the accuracy of the test results.

[0025] According to another gas chromatograph disclosed in an embodiment of the present invention, a plurality of mounting cavities are separated from each other by partitions, and the partitions form an integral structure with the substrate and constitute the heating layer, the sub-channels are formed in the partitions and are distributed in a "U" shape along the circumference of the partitions.

[0026] By adopting the above technical solution, the sub-channels are formed on the partitions between the multiple installation cavities, so that the structure of the gas chromatograph can be simplified.

[0027] In addition, by arranging the sub-channels to be distributed in a "U" shape along the circumference of the partition, the heating is more uniform, which is conducive to ensuring the heating effect.

[0028] Therefore, the solution provided in this embodiment can improve the heating effect while simplifying the structure of the gas chromatograph.

[0029] According to another gas chromatograph disclosed in an embodiment of the present invention, each chromatographic column module is configured as a block structure, and serpentine-shaped through holes are formed in the chromatographic column module, and the through holes constitute a gas chamber.

[0030] By adopting the above technical solution, a serpentine-shaped through hole is formed in the chromatography column module, and the through hole can be used as a filling column chamber, which is conducive to ensuring that a longer filling column can be arranged in a smaller space.

[0031] According to another gas chromatograph disclosed in an embodiment of the present invention, the heating layer is formed on the circumferential side wall of the installation cavity, and the sub-channels are formed in the circumferential side wall and are distributed in a serpentine shape.

[0032] By adopting the above technical solution, the present embodiment directly forms the sub-channel in the circumferential side wall of the installation cavity, which is more conducive to simplifying the structure of the gas chromatograph.

[0033] According to another gas chromatograph disclosed in an embodiment of the present invention, the liquid heating unit includes a liquid heater and a pressure pump; wherein,

[0034] The liquid outlet of the liquid heater is communicated with the inlet pipeline of the pressure pump, the outlet of the pressure pump is communicated with the inlet pipeline of the sub-channel, and the outlet of the sub-channel is communicated with the liquid inlet pipeline of the liquid heater.

[0035] According to another gas chromatograph disclosed in an embodiment of the present invention, the temperature detection module includes a temperature sensor, and the control unit includes a controller.

[0036] According to another gas chromatograph disclosed in an embodiment of the present invention, a clamping column is formed on the side wall of the chromatographic column module, a clamping groove adapted to the clamping column is formed on the inner side wall of the installation cavity, and the chromatographic column module is clamped to the clamping groove of the installation cavity through the clamping column.

[0037] The beneficial effects of the present invention are:

[0038] The present invention provides a gas chromatograph, comprising a housing, a carrier gas supply unit, a sample injection unit, a separation unit and a liquid heating unit arranged in the housing. The separation unit comprises a substrate and a plurality of chromatographic column modules, a plurality of mutually independent mounting cavities are formed on the substrate, and the plurality of chromatographic column modules are respectively detachably mounted on the corresponding mounting cavities. A joint assembly is arranged on the side wall of each mounting cavity, the joint assembly is configured with a first joint, a second joint and a third joint, the first joint can be selectively connected with the second joint or the third joint, and the first joint is connected with the corresponding gas inlet pipeline of the chromatographic column module, the second joint is connected with the pipeline of the carrier gas supply unit, and the third joint is connected with the pipeline of the separation unit. A heating layer is arranged on one side of the plurality of mounting cavities on the substrate, a cavity for storing a heat preservation liquid is formed in the heating layer, the cavity comprises a plurality of sub-channels corresponding to each mounting cavity and mutually independent, and the inlet and outlet of each sub-channel are respectively connected with the pipeline of the liquid heating unit and form a circulation loop. During installation, it is only necessary to install the chromatographic column module in the installation cavity, complete the connection work between the first joint and the corresponding air inlet pipeline of the chromatographic column module, and then the chromatographic column module can be connected to the chromatograph pipeline system. The structure can facilitate the installation of the chromatographic column module, especially when the chromatographic column module needs to be replaced, which is conducive to improving work efficiency. The chromatographic column module is heated by the insulation liquid. Since the insulation liquid has a good constant temperature effect, the insulation effect of the chromatographic column module can be guaranteed, providing protection for the experiment; and each installation cavity is equipped with a separate sub-channel, which can ensure the accuracy of temperature control of each chromatographic column module.

[0039] Therefore, the gas chromatograph provided by the present invention can improve work efficiency while ensuring the accuracy of temperature control of the chromatographic column module, thereby reducing the impact of temperature on experimental data. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of the structure of a gas chromatograph provided in an embodiment of the present invention;

[0041] Figure 2 A schematic diagram of the structure of a separation unit in a gas chromatograph provided in an embodiment of the present invention;

[0042] Figure 3 A schematic diagram of a partial cross-sectional structure of a gas chromatograph provided in an embodiment of the present invention;

[0043] Figure 4 A control principle diagram of a gas chromatograph provided in an embodiment of the present invention;

[0044] Figure 5 A flow chart of a gas chromatograph provided in an embodiment of the present invention.

[0045] Description of reference numerals:

[0046] 100, box body;

[0047] 200. carrier gas supply unit;

[0048] 300, separation unit;

[0049] 310, matrix;

[0050] 311, installation cavity; 312, heating layer; 313, flow control member; 314, card slot;

[0051] 320, chromatographic column module;

[0052] 330, connector assembly;

[0053] 400, liquid heating unit;

[0054] 410, liquid heater; 420, pressure pump;

[0055] 500. control unit;

[0056] 600. Temperature detection module;

[0057] 700. Gas volume monitoring module;

[0058] 800, solenoid valve;

[0059] 900. Injection unit. DETAILED DESCRIPTION

[0060] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0061] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0062] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0063] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0064] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0065] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0066] The embodiment of the present invention discloses a gas chromatograph, such as Figure 1-Figure 4 As shown, it includes a housing 100 , a carrier gas supply unit 200 disposed in the housing 100 , a sample injection unit 900 , a separation unit 300 and a liquid heating unit 400 .

[0067] Specifically, in this embodiment, the separation unit 300 includes a base 310 and a plurality of chromatographic column modules 320 . A plurality of mutually independent installation cavities 311 are formed on the base 310 . The plurality of chromatographic column modules 320 are detachably installed on the corresponding installation cavities 311 .

[0068] More specifically, in the present embodiment, a connector assembly 330 is provided on the side wall of each installation cavity 311, and the connector assembly 330 is configured with a first connector, a second connector and a third connector (not shown in the figure), and the first connector can be selectively connected to the second connector or the third connector, and the first connector is connected to the corresponding air inlet pipeline of the chromatographic column module 320, the second connector is connected to the pipeline of the carrier gas supply unit 200, and the third connector is connected to the pipeline of the separation unit 300.

[0069] More specifically, in the present embodiment, a heating layer 312 is provided on one side of the plurality of mounting cavities 311 on the base body 310, a cavity for storing insulation liquid is formed in the heating layer 312, the cavity includes a plurality of sub-channels corresponding to the mounting cavities 311 and independent of each other, and the inlet and outlet of each sub-channel are respectively connected to the pipeline of the liquid heating unit 400 to form a circulation loop.

[0070] More specifically, the chromatograph in this embodiment is provided with a plurality of installation cavities 311 on the base 310, and a joint assembly 330 is provided on the installation cavity 311. During installation, it is only necessary to install the chromatographic column module 320 in the installation cavity 311, and complete the connection work between the first joint and the corresponding gas inlet pipeline of the chromatographic column module 320 to achieve the connection between the chromatographic column module 320 and the chromatographic pipeline system. This structure can facilitate the installation of the chromatographic column module 320, especially when the chromatographic column module 320 needs to be replaced, which is conducive to improving work efficiency.

[0071] More specifically, in the present embodiment, a heating layer 312 is provided on one side of the plurality of mounting cavities 311, and a cavity for storing insulation liquid is formed in the heating layer 312, and the cavity includes a plurality of sub-channels corresponding to and independent of each other in the mounting cavities 311, and the sub-channels can be used to store insulation liquid, and the chromatographic column module 320 is regulated by the insulation liquid. Since the insulation liquid has a good constant temperature effect, the insulation effect of the chromatographic column module 320 can be ensured, thereby providing a guarantee for the conduct of the experiment; and each mounting cavity 311 is equipped with a separate sub-channel, thereby ensuring the accuracy of temperature control of each chromatographic column module 320.

[0072] Therefore, the gas chromatograph provided in this embodiment can improve work efficiency while ensuring the accuracy of temperature control of the chromatographic column module 320, thereby reducing the impact of temperature on experimental data.

[0073] It should be noted that, in this embodiment, the number of the installation cavities 311 may be 8, 10, 15 or other numbers, which may be set according to actual design and usage requirements, and this embodiment makes specific requirements.

[0074] In this embodiment, the structures of the carrier gas supply unit 200 and the sample injection unit 900 are not described in detail, and the existing structures can be used.

[0075] Preferably, in the gas chromatograph provided in this embodiment, Figure 4As shown, the gas chromatograph also includes a control unit 500, and a flow control component 313 is connected to the pipeline at the inlet of each sub-channel, and the signal output end of the control unit 500 is communicatively connected with the signal input end of the carrier gas supply unit 200, the signal input end of the injection unit 900, the signal input end of the liquid heating unit 400 and the signal input end of the flow control component 313 respectively.

[0076] Furthermore, the control unit 500 is preset with associated information, which includes associated information of sample type-heating temperature. The control unit 500 generates rated temperature information of the corresponding sample according to the associated information of sample type-heating temperature, and controls the working status of the liquid heating unit 400 and the flow control component 313 according to the rated temperature information.

[0077] Specifically, by setting up the flow control component 313, it is possible to accurately control the insulation liquid in each sub-channel, and the control unit 500 is preset with a related information table. When the user, the control unit 500 can call the corresponding rated temperature information according to the sample gas, and open or close the heating unit and the corresponding flow control component 313 according to the corresponding rated temperature information. This process does not require the staff to make a secondary judgment, which can reduce the labor intensity of the staff.

[0078] More specifically, in this embodiment, the association information can be a program corresponding to a sample type-heating temperature association table. The sample type can be specifically recorded in the form of a label, for example, 1-20°C. The sample type is specifically set according to the actual working type of the chromatograph, and this embodiment will not explain this in detail.

[0079] Preferably, in the gas chromatograph provided in this embodiment, Figure 1 and Figure 4 As shown, each connector assembly 330 on the installation cavity 311 has a solenoid valve 800, and the solenoid valve 800 controls the first connector to be selectively connected to the second connector or the third connector. A gas quantity monitoring module 700 is provided at the chromatographic column module 320, and the gas quantity monitoring module 700 is used to monitor the sample gas quantity in the chromatographic column module 320 and generate corresponding gas quantity information.

[0080] Specifically, in this embodiment, the signal input end of the control unit 500 is communicatively connected to the signal output end of the gas quantity monitoring module 700, and the signal output end of the control unit 500 is communicatively connected to the signal input end of the solenoid valve 800 of each of the connector assemblies 330; when the control unit 500 obtains the gas quantity information in real time and determines that the gas quantity information is greater than or equal to a preset gas quantity threshold, the gas quantity threshold can be set according to actual needs, and this embodiment does not require it. The control unit 500 controls the solenoid valve 800 so that the first connector and the second connector are closed, and the first connector and the third connector are connected.

[0081] Specifically, in the present embodiment, a gas quantity monitoring module 700 is provided, and during the sample air intake stage, the gas quantity monitoring module 700 is utilized to monitor the sample gas quantity within the chromatographic column module 320, so that the control unit 500 can obtain the corresponding gas quantity information in a timely manner, and control the state of the solenoid valve 800 according to the gas quantity information, thereby reducing the probability of the accuracy of the test results being affected by excessive or insufficient sample air intake.

[0082] More specifically, in this embodiment, the gas quantity monitoring module 700 can be set as a gas pressure sensor or a gas concentration sensor. When in use, the gas quantity information can be obtained by monitoring the concentration of the gas, or the gas quantity information can be obtained based on the gas pressure. The specific setting can be based on the actual design, and this embodiment does not make any requirements for this.

[0083] Preferably, in the gas chromatograph provided in the present embodiment, a temperature detection module 600 is also provided in each installation cavity 311, and at least the monitoring probe of the temperature detection module 600 is provided in the sub-channel. The entire temperature detection module 600 may be located in the sub-channel, or the monitoring probe of the temperature detection module 600 may be located in the sub-channel. The temperature detection module 600 is used to monitor the temperature of the insulation liquid stored in each sub-channel and generate real-time temperature information.

[0084] Specifically, in this embodiment, if Figure 4 and Figure 5 As shown, the signal input end of the control unit 500 is connected to the signal output end of the temperature detection module 600 for communication, and the real-time temperature information is obtained;

[0085] When the control unit 500 determines that the gas volume information is greater than or equal to the preset gas volume threshold and the real-time temperature information is lower than the rated temperature information, the control unit 500 controls the heating unit and the corresponding flow control member 313 to open;

[0086] When the control unit 500 determines that the gas volume information is greater than or equal to the preset gas volume threshold and the real-time temperature information is greater than or equal to the rated temperature information, the control unit 500 controls the heating unit to turn on and the corresponding flow control member 313 to turn off;

[0087] The control unit 500 determines that the gas quantity information is less than a preset gas quantity threshold, and the control unit 500 controls the heating unit to be turned off and the corresponding flow control component 313 to be turned off.

[0088] Specifically, in the present embodiment, by setting up a temperature detection module 600, since the temperature detection module 600 can monitor the temperature of the insulation liquid stored in each sub-channel in real time, the control unit 500 can accurately obtain the temperature of each chromatographic column module 320, and control the working state of the heating unit and the corresponding flow control component 313 in real time according to the real-time temperature information, thereby further ensuring the accuracy of temperature control of each chromatographic column module 320.

[0089] More specifically, in this embodiment, the temperature detection module 600 may be configured as a temperature sensor, and its specific model may be set according to actual design, and this embodiment does not make any requirements for this.

[0090] Preferably, in the gas chromatograph provided in this embodiment, Figure 1 and Figure 2 As shown, the plurality of mounting cavities 311 are separated from each other by partitions, and the partitions form an integral structure with the substrate 310 and constitute the heating layer 312 . The sub-channels are formed in the partitions and are distributed in a “U” shape along the circumference of the partitions.

[0091] Specifically, in this embodiment, by forming sub-channels on the partitions between the plurality of mounting cavities 311 , the structure of the gas chromatograph can be simplified.

[0092] More specifically, in this embodiment, by arranging the sub-channels to be distributed in a "U" shape along the circumference of the partition, the heating is more uniform, which is conducive to ensuring the heating effect.

[0093] Therefore, the solution provided in this embodiment can improve the heating effect while simplifying the structure of the gas chromatograph.

[0094] Preferably, in the gas chromatograph provided in this embodiment, each of the chromatographic column modules 320 is configured as a block structure, and a serpentine-shaped through hole is formed in the chromatographic column module 320, and the through hole constitutes a gas chamber.

[0095] Specifically, a serpentine-shaped through hole is formed in the chromatography column module 320, and the through hole can be used as a filling column chamber, which is conducive to ensuring that a longer filling column can be arranged in a smaller space.

[0096] Preferably, in the gas chromatograph provided in this embodiment, Figure 2 and Figure 3 As shown, the heating layer 312 is formed on the circumferential side wall of the installation cavity 311, and the sub-channel is formed in the circumferential side wall and is distributed in a serpentine shape.

[0097] Specifically, in this embodiment, the sub-channels are directly formed in the circumferential side walls of the installation cavity 311, which is more conducive to simplifying the structure of the gas chromatograph.

[0098] Preferably, in the gas chromatograph provided in this embodiment, Figure 1 and 4 As shown, the liquid heating unit 400 includes a liquid heater 410 and a pressure pump 420 that are electrically connected, and controls the liquid heater 410 and the pressure pump 420 to be turned on or off.

[0099] Specifically, the liquid outlet of the liquid heater 410 is connected to the inlet pipeline of the pressure pump 420, the outlet of the pressure pump 420 is connected to the inlet pipeline of the sub-channel, the outlet of the sub-channel is connected to the liquid inlet pipeline of the liquid heater 410, and the control unit 900 is specifically electrically connected to the liquid heater 410 and the pressure pump 420, respectively.

[0100] Preferably, in the gas chromatograph provided in this embodiment, the temperature detection module 600 includes a temperature sensor, and the control unit 500 includes a controller.

[0101] Specifically, the specific models of the temperature sensor and the controller are not required in this embodiment and can be set according to the actual design.

[0102] Preferably, in the gas chromatograph provided in this embodiment, Figure 1-Figure 3 As shown, a clamping column (not shown in the figure) is formed on the side wall of the chromatographic column module 320, and a clamping groove 314 adapted to the clamping column is formed on the inner wall of the installation cavity 311, and the chromatographic column module 320 is clamped in the clamping groove 314 of the installation cavity 311 through the clamping column.

[0103] The present invention provides a gas chromatograph, such as Figure 1-Figure 5As shown, it includes a housing 100, a carrier gas supply unit 200 arranged in the housing 100, a sample injection unit 900, a separation unit 300 and a liquid heating unit 400. The separation unit 300 includes a base 310 and a plurality of chromatographic column modules 320. The base 310 is formed with a plurality of mutually independent mounting cavities 311, and the plurality of chromatographic column modules 320 are detachably mounted on the corresponding mounting cavities 311. A joint assembly 330 is arranged on the side wall of each mounting cavity 311, and the joint assembly 330 is configured with a first joint, a second joint and a third joint. The first joint can be selectively connected to the second joint or the third joint, and the first joint is connected to the gas inlet pipeline of the corresponding chromatographic column module 320, the second joint is connected to the pipeline of the carrier gas supply unit 200, and the third joint is connected to the pipeline of the separation unit 300. A heating layer 312 is provided on one side of the plurality of mounting cavities 311 on the substrate 310, and a cavity for storing a heat preservation liquid is formed in the heating layer 312, and the cavity includes a plurality of sub-channels corresponding to each mounting cavity 311 and independent of each other, and the inlet and outlet of each sub-channel are respectively connected to the pipeline of the liquid heating unit 400 to form a circulation loop. During installation, the chromatographic column module 320 only needs to be installed in the mounting cavity 311, and the first joint is connected to the corresponding gas inlet pipeline of the chromatographic column module 320 to achieve the connection between the chromatographic column module 320 and the chromatographic instrument pipeline system. This structure can facilitate the installation of the chromatographic column module 320, especially when the chromatographic column module 320 needs to be replaced, which is beneficial to improving work efficiency. The chromatographic column module 320 is heated by the insulation liquid. Since the insulation liquid has a good constant temperature effect, the insulation effect of the chromatographic column module 320 can be guaranteed, providing protection for the experiment; and each installation cavity 311 is equipped with a separate sub-channel, which can ensure the accuracy of temperature control of each chromatographic column module 320.

[0104] Therefore, the gas chromatograph provided by the present invention can improve work efficiency while ensuring the accuracy of temperature control of the chromatographic column module 320, thereby reducing the impact of temperature on experimental data.

[0105] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A gas chromatograph, characterized in that: It comprises a box body, a carrier gas supply unit, a sampling unit, a separation unit and a liquid heating unit arranged in the box body; wherein, The separation unit comprises a base body and a plurality of chromatographic column modules, the base body is formed with a plurality of mutually independent installation cavities, and the plurality of chromatographic column modules are detachably installed in the corresponding installation cavities respectively; and A connector assembly is provided on the side wall of each installation cavity, and the connector assembly is configured with a first connector, a second connector and a third connector, the first connector can be selectively connected to the second connector or the third connector, and the first connector is connected to the gas inlet pipeline of the corresponding chromatographic column module, the second connector is connected to the carrier gas supply unit pipeline, and the third connector is connected to the separation unit pipeline; and, A heating layer is provided on the substrate at one side of the plurality of installation cavities, a cavity for storing insulation liquid is formed in the heating layer, the cavity includes a plurality of sub-channels corresponding to the installation cavities and independent of each other, and the inlet and outlet of each sub-channel are respectively connected to the liquid heating unit pipeline to form a circulation loop; wherein, The plurality of mounting cavities are separated from each other by partitions, and the partitions and the substrate form an integral structure and constitute the heating layer. The sub-channels are formed in the partitions and are distributed in a "U" shape along the circumference of the partitions.

2. The gas chromatograph according to claim 1, characterized in that It also includes a control unit, and a flow control component is connected to the pipeline at the inlet of each sub-channel, and the signal output end of the control unit is respectively communicated with the signal input end of the carrier gas supply unit, the signal input end of the injection unit, the signal input end of the liquid heating unit and the signal input end of the flow control component; and The control unit is preset with associated information, which includes sample type-heating temperature associated information. The control unit generates rated temperature information of the corresponding sample based on the sample type-heating temperature associated information, and controls the working status of the liquid heating unit and the flow control component based on the rated temperature information.

3. The gas chromatograph according to claim 2, characterized in that The connector assembly on each of the installation cavities has a solenoid valve, and the solenoid valve controls the first connector to selectively communicate with the second connector or the third connector. The chromatographic column module is provided with a gas volume monitoring module, and the gas volume monitoring module is used to monitor the sample gas volume in the chromatographic column module and generate corresponding gas volume information; wherein, The signal input end of the control unit is communicatively connected with the signal output end of the gas quantity monitoring module, and the signal output end of the control unit is communicatively connected with the signal input end of the solenoid valve of each of the connector assemblies; when the control unit obtains the gas quantity information in real time and determines that the gas quantity information is greater than or equal to a preset gas quantity threshold, the control unit controls the solenoid valve so that the first connector and the second connector are closed, and the first connector and the third connector are connected.

4. The gas chromatograph according to claim 3, characterized in that A temperature detection module is also provided in each of the installation cavities, at least a monitoring probe of the temperature detection module is provided in the sub-channel, and the temperature detection module is used to monitor the temperature of the insulation liquid stored in each of the sub-channels and generate real-time temperature information; wherein, The signal input end of the control unit is connected to the signal output end of the temperature detection module for communication, and the real-time temperature information is obtained; wherein, When the control unit determines that the gas volume information is greater than or equal to a preset gas volume threshold and the real-time temperature information is lower than the rated temperature information, the control unit controls the heating unit and the corresponding flow control member to open; When the control unit determines that the gas volume information is greater than or equal to a preset gas volume threshold and the real-time temperature information is greater than or equal to the rated temperature information, the control unit controls the heating unit to turn on and the corresponding flow control component to turn off; The control unit determines that the gas quantity information is less than a preset gas quantity threshold, and the control unit controls the heating unit to be turned off and the corresponding flow control component to be turned off.

5. The gas chromatograph according to any one of claims 1 to 4, characterized in that: Each of the chromatographic column modules is configured as a block structure, and a serpentine-shaped through hole is formed in the chromatographic column module, and the through hole constitutes a gas chamber.

6. The gas chromatograph according to any one of claims 1 to 4, characterized in that: The heating layer is formed on the circumferential side wall of the installation cavity, and the sub-channels are formed in the circumferential side wall and are distributed in a serpentine shape.

7. The gas chromatograph according to any one of claims 1 to 4, characterized in that: The liquid heating unit comprises a liquid heater and a pressure pump; wherein, The liquid outlet of the liquid heater is communicated with the inlet pipeline of the pressure pump, the outlet of the pressure pump is communicated with the inlet pipeline of the sub-channel, and the outlet of the sub-channel is communicated with the liquid inlet pipeline of the liquid heater.

8. The gas chromatograph according to claim 4, characterized in that The temperature detection module includes a temperature sensor, and the control unit includes a controller.

9. The gas chromatograph according to any one of claims 1 to 4, characterized in that: A clamping column is formed on the side wall of the chromatographic column module, a clamping groove adapted to the clamping column is formed on the inner side wall of the installation cavity, and the chromatographic column module is clamped in the clamping groove of the installation cavity through the clamping column.

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