Multi-temperature-zone gas chromatographic analysis system applying air bath heating and temperature control method

Abstract

The invention relates to the technical field of gas chromatographic analysis, in particular to a multi-temperature-zone gas chromatographic analysis system applying air bath heating and a temperature control method, and the multi-temperature-zone gas chromatographic analysis system comprises a gas circuit mechanism, an electrical control mechanism and a column box; more than two column box units are arranged in the column box, a column cavity is formed in each column box unit, and an anti-explosion hot air blowing mechanism and a temperature control mechanism are arranged in each column cavity; the anti-explosion hot air blowing mechanism is communicated with the air path mechanism and can heat the air flow and input the air flow into the column box unit; the temperature control mechanism can collect the temperature in the anti-explosion hot air blowing mechanism and the temperature in the column box unit and transmit the temperature to the electric control mechanism. The air path mechanism is used for providing air flow for the anti-explosion hot air blowing mechanism; the electrical control mechanism is used for adjusting the temperature in the anti-explosion hot air blowing mechanism, the temperature in the column box unit and the air flow speed of the air path mechanism, and the measurement of the chromatographic analyzer can be more accurate by controlling the temperature in the anti-explosion hot air blowing mechanism and the column box unit from two dimensions, the holding time and the controlled temperature.

Description

Technical Field

[0001] The invention relates to the technical field of gas chromatography analysis, in particular to a multi-temperature zone gas chromatography analysis system using air bath heating. Background Art

[0002] A gas chromatograph is an instrument used for gas analysis and testing. It uses gas as the mobile phase for chromatographic separation and analysis based on gas chromatography. The vaporized sample is carried into the chromatographic column by the carrier gas. The stationary phase in the column interacts differently with the molecules of the sample components, resulting in different elution times for each component, leading to separation. Using an appropriate identification and recording system, a chromatogram is produced, showing the time and concentration of each component eluting from the column. The peak elution time and sequence shown in the graph allow for qualitative analysis of compounds, while peak height and area allow for quantitative analysis.

[0003] Chinese patent publication number CN218567287U discloses a fast-heating gas chromatograph column box. The column box uses a single column box with a single heating port. When performing gradient heating or cooling on a test sample, only one operation can be performed, and multiple test results cannot be obtained at the same time. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-temperature zone gas chromatography analysis system using air bath heating in order to solve the above-mentioned problems.

[0005] The technical solution adopted by the present invention is as follows: a multi-temperature zone gas chromatography analysis system using air bath heating, comprising a gas path mechanism, an electrical control mechanism and a column box;

[0006] The column box is provided with two or more column box units, and the two or more column box units are overlapped to form multiple temperature zones, each of the column box units is provided with a column cavity, and the column cavity is provided with an explosion-proof hot air blowing mechanism and a temperature control mechanism;

[0007] The explosion-proof hot air blowing mechanism is connected to the air path mechanism, and can heat the air flow and input it into the column box unit;

[0008] The temperature control mechanism can collect the temperature inside the explosion-proof hot air blowing mechanism and the temperature inside the column box unit, and transmit them to the electrical control mechanism;

[0009] The air path mechanism is used to provide air flow to the explosion-proof hot air blowing mechanism;

[0010] The electrical control mechanism is used to adjust the temperature inside the explosion-proof hot air blowing mechanism, the temperature inside the column box unit and the air flow rate of the gas path mechanism.

[0011] Furthermore, an exhaust hole is provided in the column cavity, and the air flow input from the explosion-proof hot air blowing mechanism can be discharged from the exhaust hole.

[0012] Furthermore, the temperature control mechanism includes a first temperature control unit and a second temperature control unit, wherein the first temperature control unit is provided in the column cavity and is used to collect the temperature in the column box unit;

[0013] The second temperature control unit is arranged in the explosion-proof hot air blowing mechanism and is used to collect the temperature in the explosion-proof hot air blowing mechanism. The second temperature control unit and the first temperature control unit are both connected to the electrical control mechanism signal.

[0014] Furthermore, the first temperature control unit and the second temperature control unit are K-type thermocouples.

[0015] Furthermore, the air path mechanism includes an air path box and an air pump, and the air delivery end of the air path box is connected to the explosion-proof hot air blowing mechanism via the air pump.

[0016] Furthermore, the explosion-proof hot air blowing mechanism comprises an air inlet pipe, a connecting pipe and a heating pipe;

[0017] One end of the connecting pipe is connected to the heating pipe, and the other end is connected to the air inlet pipe, and the connecting pipe passes through the column box unit;

[0018] The air inlet pipe is connected to the air pump to provide air flow;

[0019] The heating tube is located in the column box unit, and a heating component is provided in the heating tube.

[0020] Furthermore, a heating cavity is provided in the heating tube, and the heating component is a heating rod core, and the heating rod core is provided in the heating cavity, and the heating rod core can generate heat after being powered on.

[0021] Furthermore, the axes of the air inlet pipe, the connecting pipe and the heating pipe coincide with each other, and the heating rod core is arranged around the axis of the heating pipe.

[0022] Furthermore, the column box unit is filled with aluminum silicate fiber insulation board.

[0023] The present application also provides a multi-temperature zone gas chromatography analysis temperature control method using air bath heating based on a multi-temperature zone gas chromatography analysis system using air bath heating, comprising the following steps:

[0024] S1. The first temperature control unit and the second temperature control unit are respectively collecting the temperature inside the column box unit and the temperature inside the explosion-proof hot air blowing mechanism, and transmit it to the electrical control mechanism;

[0025] S2. The electrical control mechanism compares the test sample temperature threshold and generates a temperature regulation strategy;

[0026] S3. Based on the temperature regulation strategy, the electrical control mechanism controls the air pump and the heating core rod to adjust the temperature of the column box unit and the explosion-proof hot air blowing mechanism.

[0027] Furthermore, the temperature adjustment strategy includes the following: the temperature of the explosion-proof hot air blowing mechanism is within a threshold and the temperature in the column box unit needs to be increased; the temperature of the explosion-proof hot air blowing mechanism is within a threshold and the temperature in the column box unit needs to be kept warm; the temperature of the explosion-proof hot air blowing mechanism is within a threshold and the temperature in the column box unit needs to be cooled; and the temperature of the explosion-proof hot air blowing mechanism exceeds a threshold;

[0028] When the temperature of the explosion-proof hot air blowing mechanism is within the threshold and the temperature in the column box unit needs to be raised, the electrical control mechanism increases the power of the heating core rod until the first temperature control unit feeds back that the temperature in the column box unit reaches the set temperature, and the electrical control determines that the temperature in the box unit needs to be kept warm;

[0029] When the temperature of the explosion-proof hot air blowing mechanism is within the threshold and the temperature in the column box unit needs to be kept warm, the electrical control mechanism controls the heating core rod and the air pump to maintain the current power;

[0030] When the temperature of the explosion-proof hot air blowing mechanism is within the threshold and the temperature in the column box unit needs to be cooled, the electrical control mechanism reduces the power of the heating core rod and increases the power of the air pump at the same time until the first temperature control unit feeds back that the temperature in the column box unit has reached the set temperature, and the electrical control determines that the temperature in the box unit needs to be kept warm;

[0031] When the temperature of the explosion-proof heat-blowing mechanism exceeds a threshold value, the electrical control mechanism reduces the power of the heating core rod until the second temperature control unit feeds back that the temperature inside the explosion-proof heat-blowing mechanism returns to the set temperature.

[0032] The beneficial effects of the present invention include at least one of the following:

[0033] 1. By replacing the column box in the existing gas chromatography analysis device with multiple column box units, and each column box unit adopts an explosion-proof hot air blowing mechanism for independent heating, the sample can be heated or cooled in a gradient manner, and some components in the column box that are not resistant to high temperatures can be protected, thereby extending the service life.

[0034] 2. When the overall volume of the gas chromatography analysis device remains unchanged, the column box composed of multiple column box units has a narrower temperature zone distribution and better accuracy than the single large column box structure in the prior art.

[0035] 3. The use of aluminum silicate fiberboard filler makes the column box unit have good thermal insulation effect, reducing the impact of the external environment and adjacent column box units.

[0036] 4. A temperature control method is provided to control the temperature-proof explosion-proof hot air blowing mechanism and the heating and cooling rates in the column box unit, the holding time and the temperature control temperature, so that the chromatographic analyzer can measure more accurately and better separate impurities.

[0037] 5. It solves the problem that the existing single column box with a single heating port structure can only perform one operation when performing gradient heating or cooling on the test sample, and cannot obtain multiple test results at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the structure of a multi-temperature zone gas chromatography analysis system using air bath heating;

[0039] Figure 2 This is a schematic diagram of the internal structure of a multi-temperature zone gas chromatography analysis system using air bath heating;

[0040] Figure 3 Schematic diagram of the internal structure of the column box unit;

[0041] Figure 4 This is a schematic diagram of the explosion-proof hot air blower structure;

[0042] Figure 5 This is a schematic diagram of the internal structure of the explosion-proof hot air blower;

[0043] Figure 6 Schematic diagram of temperature control.

[0044] In the picture:

[0045] 1 is the device body, 2 is the air circuit box, 3 is the display panel, 4 is the first electrical box, 5 is the second electrical box, 6 is the third electrical box, 7 is the first door panel, 8 is the second door panel, 9 is the third door panel, 10 is the first explosion-proof hot blower, 11 is the second explosion-proof hot blower, 12 is the third explosion-proof hot blower, 13 is the first column cavity, 14 is the second column cavity, 15 is the third column cavity, 16 is the first exhaust hole, 17 is the second exhaust hole, 18 is the third exhaust hole, 19 is the aluminum silicate fiber insulation board, 20 is the heating pipe, 21 is the connecting pipe, 22 is the air inlet pipe, 23 is the heating chamber, 24 is the heating rod core, 25 is the first temperature control unit, and 26 is the second temperature control unit. DETAILED DESCRIPTION

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0048] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0049] It should be noted that 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 or explained in subsequent drawings.

[0050] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are 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 typically placed when in use, or are the orientations or positional relationships commonly understood by those skilled in the art. These terms are intended only to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0051] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0052] like Figures 1 to 3 As shown, a multi-temperature zone gas chromatography analysis system using air bath heating includes a gas path mechanism, an electrical control mechanism and a column box;

[0053] The column box is provided with two or more column box units, and the two or more column box units are overlapped to form multiple temperature zones, each of the column box units is provided with a column cavity, and the column cavity is provided with an explosion-proof hot air blowing mechanism and a temperature control mechanism;

[0054] The explosion-proof hot air blowing mechanism is connected to the air path mechanism, and can heat the air flow and input it into the column box unit;

[0055] The temperature control mechanism can collect the temperature inside the explosion-proof hot air blowing mechanism and the temperature inside the column box unit, and transmit them to the electrical control mechanism;

[0056] The air path mechanism is used to provide air flow to the explosion-proof hot air blowing mechanism;

[0057] The electrical control mechanism is used to adjust the temperature inside the explosion-proof hot air blowing mechanism, the temperature inside the column box unit and the air flow rate of the gas path mechanism.

[0058] The purpose of this design is, on the one hand, to replace the column box in the existing gas chromatography analysis device with multiple column box units, and each column box unit uses an explosion-proof hot-blowing mechanism to provide heat separately, so that the sample can be heated or cooled in a gradient manner, and some components in the column box that are not resistant to high temperatures can be protected, thereby extending the service life. Under the condition that the overall volume of the gas chromatography analysis device remains unchanged, the column box composed of multiple column box units has a narrower temperature zone distribution and better accuracy than the single large column box structure in the prior art. On the other hand, by adjusting the temperature in the explosion-proof hot-blowing mechanism and the temperature in the column box unit, a temperature-controlled measurement can be formed. The temperature-controlled explosion-proof hot-blowing mechanism and the heating and cooling rate in the column box unit, the holding time and the temperature control temperature can make the chromatograph measurement more accurate and better separate impurities. It solves the problem of the existing single column box with a single heating port structure, which can only select one operation when performing gradient heating or cooling on the test sample, and cannot obtain multiple test results at the same time.

[0059] like Figure 4 and Figure 5 As shown, the temperature control mechanism includes a first temperature control unit 25 and a second temperature control unit 26. The first temperature control unit 25 is provided in the column cavity and is used to collect the temperature in the column box unit;

[0060] The second temperature control unit 26 is provided in the explosion-proof hot air blowing mechanism and is used to collect the temperature in the explosion-proof hot air blowing mechanism. The second temperature control unit 26 and the first temperature control unit 25 are both connected to the electrical control mechanism signal.

[0061] At the same time, the air path mechanism includes an air path box 2 and an air pump, and the air delivery end of the air path box 2 is connected to the explosion-proof hot air blowing mechanism via the air pump.

[0062] Furthermore, the explosion-proof hot air blowing mechanism comprises an air inlet pipe 22, a connecting pipe 21 and a heating pipe 20;

[0063] One end of the connecting pipe 21 is connected to the heating pipe 20, and the other end is connected to the air inlet pipe 22. The connecting pipe 21 passes through the column box unit;

[0064] The air inlet pipe 22 is connected to the air pump to provide air flow;

[0065] The heating tube 20 is located in the column box unit, and a heating component is provided in the heating tube 20 .

[0066] At the same time, a heating cavity 23 is provided in the heating tube 20 , and the heating component is a heating rod core 24 , and the heating rod core 24 is provided in the heating cavity 23 , and the heating rod core 24 can generate heat after being powered on.

[0067] Furthermore, the axes of the air inlet pipe 22 , the connecting pipe 21 and the heating pipe 20 coincide with each other, and the heating rod core 24 is disposed around the axis of the heating pipe 20 .

[0068] The purpose of this design is to transport the gas to the air inlet pipe 22 through the air channel connected to the air box through the air pump, and the connecting pipe 21 is inserted into the upper part of the column cavity, and then its two sides are connected to the air inlet pipe and the heating pipe respectively through a threaded structure, so that the air input from the air inlet pipe can enter the heating pipe through the connecting pipe, and a heating rod core is provided in the heating pipe. Usually, this heating rod core is electrically heated, so that the temperature in the heating pipe can be raised to 400°C at most. The column cavity is heated by the discharged or blown hot air flow, and the maximum temperature of the column cavity is 260°C.

[0069] At the same time, the first temperature control unit 25 is arranged below the heating tube 20 for collecting the temperature in the column cavity, while the second temperature control unit 26 is arranged at the air outlet of the heating tube 20, so that the air is used as a carrier to heat the heating rod core to form an air bath heating to heat the column box.

[0070] At the same time, a display panel 3 is also provided in this embodiment for displaying various index parameters. It should be pointed out that this parameter display is an existing technology, in which sensors in various components collect data and process and then display the data.

[0071] Taking an actual product as an example, a multi-temperature zone gas chromatography analysis system using air bath heating includes a device body 1, a gas circuit box 2 is provided on the top of the device body 1, an electrical box and a column box are provided at the bottom of the device body 1, the electrical box is used to control the column box, and the gas circuit box 2 is used to supply gas to the column box, wherein the column box includes multiple column box units, each of which is provided with an explosion-proof hot air blowing mechanism, and multiple column box units are overlapped to form multiple temperature zones;

[0072] A plurality of electrical box units are arranged in the electrical box, and the number of the electrical box units is equal to the number of the column box units, and the positions of the electrical box units match those of the column box units.

[0073] At the same time, it should be pointed out that the gas path structure and circuit structure of the gas path box and electrical box used in this embodiment are all existing technologies. This embodiment only superimposes the gas path structure and circuit structure therein on the basis of the existing technology in order to adapt to the matching of multiple column box units. Technical personnel in this field can make choices according to actual needs when implementing this solution.

[0074] In this embodiment, three column box units are used as an example for explanation, and the column box includes a first column box unit, a second column box unit and a third column box unit;

[0075] The electrical control mechanism includes a first electrical box 4, a second electrical box 5 and a third electrical box 6;

[0076] The first electrical box 4 is used to control the first column box unit;

[0077] The second electrical box 5 is used to control the second column box unit;

[0078] The third electrical box 6 is used to control the third column box unit.

[0079] At the same time, the first column box unit includes a first door panel 7 and a first box body, and the first door panel 7 is arranged at the opening of the first box body, and one end of the first door panel 7 is connected to the side of the first box body through a hinge;

[0080] The second column box unit includes a second door panel 8 and a second box body, and the second door panel 8 is provided at the opening of the second box body, and one end of the second door panel 8 is connected to the side of the second box body through a hinge;

[0081] The third column box unit includes a third door panel 9 and a third box body, and the third door panel 9 is arranged at the opening of the third box body, and one end of the third door panel 9 is connected to the side of the third box body through a hinge.

[0082] Door panel covers are further provided on the outside of the first door panel 7 , the second door panel 8 and the third door panel 9 , and silicone sealing strips are provided between the door panel covers and the first door panel 7 , the second door panel 8 and the third door panel 9 .

[0083] At the same time, the first box, the second box and the third box are all filled with aluminum silicate fiber insulation board 19.

[0084] It should be pointed out that in actual design, in order to ensure the sealing of the entire column box unit, in addition to setting the door panel and door panel cover, an outer box will be set inside the door panel, and an inner box will be set in the outer box, that is, the first box body, the second box body and the third box body are all double-layer structures. In this way, the overall sealing is improved through multi-layer wrapping, and the use of filled aluminum silicate fiberboard makes the column box unit have good thermal insulation effect, reducing the impact of the external environment and adjacent column box units, and the added silicone sealing strip cavity, door panel, door panel cover and other structures have no direct connection to prevent high temperature from spreading to the outer surface of the instrument to avoid burns.

[0085] In this embodiment, a first column cavity 13 is provided in the first housing, and a first explosion-proof hot air blower 10 and a first exhaust hole 16 are provided in the first column cavity 13;

[0086] The air outlet of the first explosion-proof hot air blower 10 faces the first column cavity 13, and the hot air can be discharged from the first exhaust hole 16;

[0087] A second column cavity 14 is provided in the second box body, and a second explosion-proof hot blower 11 and a second exhaust hole 17 are provided in the second column cavity 14;

[0088] The air outlet of the second explosion-proof hot air blower 11 faces the second column cavity 14, and the hot air can be discharged from the second exhaust hole 17;

[0089] The third housing is provided with a third column cavity 15, and the third explosion-proof hot air blower 12 and the third exhaust hole 18 are provided in the third column cavity 15;

[0090] The air outlet of the third explosion-proof hot air blower 12 faces the third column cavity 15 , and the hot air can be discharged from the third exhaust hole 18 .

[0091] The purpose of such a design is to heat the three column box units respectively by arranging the first explosion-proof hot air blower, the second explosion-proof hot air blower and the third explosion-proof hot air blower.

[0092] like Figure 6 As shown, this embodiment also provides a temperature control method for a multi-temperature zone gas chromatography analysis system using air bath heating, comprising the following steps:

[0093] S1. The first temperature control unit 25 and the second temperature control unit 26 are respectively collecting the temperature inside the column box unit and the temperature inside the explosion-proof hot air blowing mechanism, and transmitted to the electrical control mechanism;

[0094] S2. The electrical control mechanism compares the test sample temperature threshold and generates a temperature regulation strategy;

[0095] S3. Based on the temperature regulation strategy, the electrical control mechanism controls the air pump and the heating core rod to adjust the temperature of the column box unit and the explosion-proof hot air blowing mechanism.

[0096] At the same time, in the specific implementation, the temperature adjustment strategy includes the following: the temperature of the explosion-proof hot air blowing mechanism is within the threshold and the temperature in the column box unit needs to be increased; the temperature of the explosion-proof hot air blowing mechanism is within the threshold and the temperature in the column box unit needs to be kept warm; the temperature of the explosion-proof hot air blowing mechanism is within the threshold and the temperature in the column box unit needs to be cooled; and the temperature of the explosion-proof hot air blowing mechanism exceeds the threshold;

[0097] When the temperature of the explosion-proof hot air blowing mechanism is within the threshold and the temperature in the column box unit needs to be increased, the electrical control mechanism increases the power of the heating core rod until the first temperature control unit 25 feedbacks that the temperature in the column box unit reaches the set temperature, and the electrical control determines that the temperature in the box unit needs to be kept warm;

[0098] When the temperature of the explosion-proof hot air blowing mechanism is within the threshold and the temperature in the column box unit needs to be kept warm, the electrical control mechanism controls the heating core rod and the air pump to maintain the current power;

[0099] When the temperature of the explosion-proof hot air blowing mechanism is within the threshold and the temperature in the column box unit needs to be cooled, the electrical control mechanism reduces the power of the heating core rod and increases the power of the air pump at the same time until the first temperature control unit 25 feedbacks that the temperature in the column box unit reaches the set temperature, and the electrical control determines that the temperature in the box unit needs to be kept warm;

[0100] When the temperature of the explosion-proof heat-blowing mechanism exceeds a threshold value, the electrical control mechanism reduces the power of the heating core rod until the second temperature control unit 26 feeds back that the temperature in the explosion-proof heat-blowing mechanism returns to the set temperature.

[0101] It should be pointed out that since the temperature inside the heating tube can be raised to a maximum of 400°C, and the column cavity is equipped with a variety of collection components, its maximum temperature is around 260°C. Therefore, under normal circumstances, the temperature inside the column box unit does not need to be raised when the temperature of the explosion-proof hot air blowing mechanism exceeds the threshold.

[0102] Normally, the column box temperature control is the main control, and the explosion-proof hot air blower temperature control is the sub-control. Both control the temperature at the same time. The sub-control mainly protects the hot air blower, and the main control controls the column box temperature. The main control temperature is set according to actual needs, and the temperature and heating rate can be set in multiple stages.

[0103] At the same time, the hot air blower serves as both a heating element and a heat dissipation element. When heat dissipation is required, the electrical control mechanism controls the heating core rod inside the hot air blower to reduce the power until it stops working. The air pump connected to the explosion-proof hot air blower mechanism continues to work, cooling the column box by continuously filling air into it.

[0104] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-temperature zone gas chromatography analysis system using air bath heating, characterized in that: Including gas path mechanism, electrical control mechanism and column box; The column box is provided with two or more column box units, and the two or more column box units are overlapped to form multiple temperature zones, each of the column box units is provided with a column cavity, and the column cavity is provided with an explosion-proof hot air blowing mechanism and a temperature control mechanism; The explosion-proof hot air blowing mechanism is connected to the air path mechanism, and can heat the air flow and input it into the column box unit; The temperature control mechanism can collect the temperature inside the explosion-proof hot air blowing mechanism and the temperature inside the column box unit, and transmit them to the electrical control mechanism; The air path mechanism is used to provide air flow to the explosion-proof hot air blowing mechanism; The electrical control mechanism is used to adjust the temperature inside the explosion-proof hot air blowing mechanism, the temperature inside the column box unit and the air flow rate of the gas path mechanism.

2. The multi-temperature zone gas chromatography analysis system using air bath heating according to claim 1, characterized in that: An exhaust hole is also provided in the column cavity, and the air flow input from the explosion-proof hot air blowing mechanism can be discharged from the exhaust hole.

3. The multi-temperature zone gas chromatography analysis system using air bath heating according to claim 1, characterized in that: The temperature control mechanism comprises a first temperature control unit (25) and a second temperature control unit (26), wherein the first temperature control unit (25) is arranged in the column cavity and is used to collect the temperature in the column box unit; The second temperature control unit (26) is arranged in the explosion-proof hot air blowing mechanism and is used to collect the temperature in the explosion-proof hot air blowing mechanism. The second temperature control unit (26) and the first temperature control unit (25) are both connected to the electrical control mechanism signal.

4. The multi-temperature zone gas chromatography analysis system using air bath heating according to claim 3, characterized in that: The first temperature control unit (25) and the second temperature control unit (26) are K-type thermocouples.

5. The multi-temperature zone gas chromatography analysis system using air bath heating according to claim 3, characterized in that: The air path mechanism comprises an air path box (2) and an air pump, and the air delivery end of the air path box (2) is connected to the explosion-proof hot air blowing mechanism via the air pump; the explosion-proof hot air blowing mechanism comprises an air inlet pipe (22), a connecting pipe (21) and a heating pipe (20); One end of the connecting pipe (21) is connected to the heating pipe (20), and the other end is connected to the air inlet pipe (22), and the connecting pipe (21) passes through the column box unit; The air inlet pipe (22) is connected to the air pump and is used to provide air flow; The heating tube (20) is located in the column box unit, and a heating component is provided in the heating tube (20).

6. The multi-temperature zone gas chromatography analysis system using air bath heating according to claim 5, characterized in that: A heating cavity (23) is provided in the heating tube (20), and the heating component is a heating rod core (24). The heating rod core (24) is provided in the heating cavity (23), and the heating rod core (24) can generate heat after being energized.

7. The multi-temperature zone gas chromatography analysis system using air bath heating according to claim 6, characterized in that: The axes of the air inlet pipe (22), the connecting pipe (21) and the heating pipe (20) coincide with each other, and the heating rod core (24) is arranged around the axis of the heating pipe (20).

8. The multi-temperature zone gas chromatography analysis system using air bath heating according to any one of claims 1 to 7, characterized in that: The column box unit is filled with aluminum silicate fiber insulation board (19).

9. A temperature control method for multi-temperature zone gas chromatography analysis using air bath heating, implemented based on the multi-temperature zone gas chromatography analysis system using air bath heating according to any one of claims 3 to 7, characterized in that: The following steps are involved: S1. The first temperature control unit (25) and the second temperature control unit (26) respectively collect the temperature inside the column box unit and the temperature inside the explosion-proof hot air blowing mechanism, and transmit them to the electrical control mechanism; S2. The electrical control mechanism compares the test sample temperature threshold and generates a temperature regulation strategy; S3. Based on the temperature regulation strategy, the electrical control mechanism controls the air pump and the heating core rod to adjust the temperature of the column box unit and the explosion-proof hot air blowing mechanism.

10. The multi-temperature zone gas chromatography temperature control method using air bath heating according to claim 9, characterized in that: The temperature adjustment strategy includes: the temperature of the explosion-proof heat-blowing mechanism is within the threshold and the temperature in the column box unit needs to be increased; the temperature of the explosion-proof heat-blowing mechanism is within the threshold and the temperature in the column box unit needs to be kept warm; the temperature of the explosion-proof heat-blowing mechanism is within the threshold and the temperature in the column box unit needs to be lowered; and the temperature of the explosion-proof heat-blowing mechanism exceeds the threshold; When the temperature of the explosion-proof hot air blowing mechanism is within the threshold and the temperature in the column box unit needs to be raised, the electrical control mechanism increases the power of the heating core rod until the first temperature control unit (25) feeds back that the temperature in the column box unit reaches the set temperature, and the electrical control determines that the temperature in the box unit needs to be kept warm; When the temperature of the explosion-proof hot air blowing mechanism is within the threshold and the temperature in the column box unit needs to be kept warm, the electrical control mechanism controls the heating core rod and the air pump to maintain the current power; When the temperature of the explosion-proof hot air blowing mechanism is within the threshold and the temperature in the column box unit needs to be cooled, the electrical control mechanism reduces the power of the heating core rod and increases the power of the air pump at the same time until the first temperature control unit (25) feeds back that the temperature in the column box unit reaches the set temperature, and the electrical control determines that the temperature in the box unit needs to be kept warm; When the temperature of the explosion-proof hot air blowing mechanism exceeds a threshold value, the electrical control mechanism reduces the power of the heating core rod until the second temperature control unit (26) feeds back that the temperature in the explosion-proof hot air blowing mechanism returns to the set temperature.

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