Multi-temperature-zone gas chromatography analysis system and temperature control method using air bath heating

Abstract

The application relates to the technical field of gas chromatography analysis, in particular to a multi-temperature-zone gas chromatography analysis system and a temperature control method applying air bath heating, which comprises a gas path mechanism, an electrical control mechanism and a column box. Two or more column box units are arranged in the column box, each column box unit is provided with a column cavity, and an anti-explosion hot air blowing mechanism and a temperature control mechanism are arranged in the column cavity. The anti-explosion hot air blowing mechanism is communicated with the gas path mechanism, can heat 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 temperatures to the electrical control mechanism. The gas path mechanism is used for providing air flow to 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 gas path mechanism. The temperature control of the anti-explosion hot air blowing mechanism and the column box unit from two dimensions, the time and the temperature can make the measurement of the chromatographic analyzer more accurate.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of gas chromatography analysis, in particular to a multi-temperature-zone gas chromatography analysis system applying air bath heating. BACKGROUND

[0002] The gas chromatography analyzer is an instrument for gas analysis and detection, which is based on gas chromatography and uses gas as a mobile phase. The vaporized sample is carried into a chromatographic column by a carrier gas. The fixed phase in the column and the molecules in the sample have different interaction forces, and the components flow out of the column at different times, and the components are separated from each other. By using appropriate identification and recording systems, a chromatogram showing the time and concentration of each component flowing out of the chromatographic column is produced. According to the peak time and order shown in the graph, the compounds can be qualitatively analyzed; according to the height and area size of the peak, the compounds can be quantitatively analyzed.

[0003] The Chinese patent with the publication number CN218567287U discloses a rapid heating gas chromatograph column box, which adopts a single column box matched with a single heating port structure. When gradient heating or cooling of the test sample is performed, only one operation can be performed, and multiple test results cannot be obtained at the same time. SUMMARY

[0004] The purpose of the present application is to provide a multi-temperature-zone gas chromatography analysis system applying air bath heating and the like in view of the above-mentioned problems.

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

[0006] Two or more column box units are arranged in the column box, and the two or more column box units are arranged in an overlapping manner to form multiple temperature zones. Each column box unit is provided with a column cavity, and an explosion-proof hot air blowing mechanism and a temperature control mechanism are arranged in the column cavity.

[0007] The explosion-proof hot air blowing mechanism is in communication with the gas path mechanism, and can heat the air flow and input the air flow into the column box unit.

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

[0009] The gas 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 in the explosion-proof hot air blowing mechanism, the temperature in the column box unit and the air flow rate of the gas path mechanism.

[0011] Further, the column cavity is provided with an exhaust hole, and the air flow input from the explosion-proof hair dryer mechanism can be discharged from the exhaust hole.

[0012] Further, the temperature control mechanism comprises a first temperature control unit and a second temperature control unit, the first temperature control unit is arranged 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 hair dryer mechanism and is used to collect the temperature in the explosion-proof hair dryer mechanism, and the second temperature control unit and the first temperature control unit are signal connected with the electrical control mechanism.

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

[0015] Further, the gas path mechanism comprises a gas path box and a gas pump, and the gas inlet end of the gas path box is communicated with the explosion-proof hair dryer mechanism through the gas pump.

[0016] Further, the explosion-proof hair dryer mechanism comprises an air inlet pipe, a connecting pipe and a heating pipe;

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

[0018] The air inlet pipe is communicated with the gas pump and is used to provide air flow;

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

[0020] Further, the heating pipe is provided with a heating cavity, the heating component is a heating rod core, and the heating rod core is arranged in the heating cavity and can heat after being electrified.

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

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

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

[0024] S1. The first temperature control unit and the second temperature control unit collect the temperature in the column box unit and the temperature in the explosion-proof hair dryer mechanism respectively, and transmit to the electrical control mechanism;

[0025] S2. The electrical control mechanism compares the test sample temperature threshold value to generate a temperature adjustment strategy;

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

[0027] Further, the temperature regulation strategy includes that the temperature of the explosion-proof hot air blowing mechanism is within the threshold value and the temperature in the column box unit needs to be raised, the temperature of the explosion-proof hot air blowing mechanism is within the threshold value and the temperature in the column box unit needs to be kept, the temperature of the explosion-proof hot air blowing mechanism is within the threshold value and the temperature in the column box unit needs to be lowered, and the temperature of the explosion-proof hot air blowing mechanism exceeds the threshold value.

[0028] When the temperature of the explosion-proof hot air blowing mechanism is within the threshold value 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 column box unit needs to be kept.

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

[0030] When the temperature of the explosion-proof hot air blowing mechanism is within the threshold value and the temperature in the column box unit needs to be lowered, the electrical control mechanism reduces the power of the heating core rod while increasing the power of the air pump 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 column box unit needs to be kept.

[0031] When the temperature of the explosion-proof hot air blowing mechanism exceeds the 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 in the explosion-proof hot air blowing mechanism returns to the set temperature.

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

[0033] 1. By replacing the existing column box in the gas chromatography analysis device with multiple column box units, and each column box unit is heated separately by the explosion-proof hot air blowing mechanism, the sample can be gradiently heated or cooled, and the parts in the column box that are not resistant to high temperature can be protected, prolonging the service life.

[0034] 2. In the case 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 distribution and better precision than the single large column box structure in the prior art.

[0035] 3. The use of aluminum silicate fiber-filled board makes the column box unit have good heat preservation and insulation effect, reducing the influence of the external environment and adjacent column box units.

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

[0037] 5. The existing single column oven with a single heating port structure can only perform one operation when the test sample is subjected to gradient heating or cooling, and cannot obtain multiple test results at the same time. BRIEF DESCRIPTION OF DRAWINGS

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

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

[0040] Figure 3 It is a schematic diagram of the internal structure of a column oven unit;

[0041] Figure 4 It is a schematic diagram of the structure of an explosion-proof hair dryer;

[0042] Figure 5 It is a schematic diagram of the internal structure of an explosion-proof hair dryer;

[0043] Figure 6 It is a temperature control schematic diagram.

[0044] In the figure:

[0045] 1 is the device body, 2 is the gas path 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 hair dryer, 11 is the second explosion-proof hair dryer, 12 is the third explosion-proof hair dryer, 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 cavity, 24 is the heating rod core, 25 is the first temperature control unit, and 26 is the second temperature control unit. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application 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 application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the application.

[0048] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict.

[0049] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0050] In the description of the application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first", "second" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0051] In the description of the application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

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

[0053] Two or more column box units are arranged in the column box, and the two or more column box units are arranged in an overlapping manner to form multiple temperature zones. Each column box unit is provided with a column cavity, and an explosion-proof hot air blowing mechanism and a temperature control mechanism are arranged in the column cavity.

[0054] The explosion-proof hot air blowing mechanism is in communication with the gas 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 in the explosion-proof hot air blowing mechanism and the temperature in the column box unit and transmit 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 in the explosion-proof hot air blowing mechanism, the temperature in the column box unit and the air flow rate of the air path mechanism.

[0058] The purpose of such design is that, on the one hand, by replacing the existing column box in the gas chromatography analysis device with multiple column box units, and each column box unit is heated separately by the explosion-proof hot air blowing mechanism, the sample can be gradient heated or cooled, and the parts in the column box that are not resistant to high temperature can be protected, and the service life is prolonged. In the case that the overall volume of the gas chromatography analysis device does not change, compared with the single large column box structure in the prior art, the column box composed of multiple column box units has narrower temperature distribution and better precision than the large column box. On the other hand, by adjusting the temperature in the explosion-proof hot air blowing mechanism and the temperature in the column box unit, a temperature control measurement can be formed, the temperature control explosion-proof hot air blowing mechanism and the column box unit can control the heating and cooling rate, the holding time and the control temperature, which can make the chromatography analyzer measure more accurately and better separate impurities. The problem of the existing single column box structure with a single heating port is solved, which can only perform one operation when gradient heating or cooling the test sample, and multiple test results cannot be obtained at the same time.

[0059] As shown in Figure 4 and Figure 5 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 arranged in the column cavity and used to collect the temperature in the column box unit.

[0060] The second temperature control unit 26 is arranged in the explosion-proof hot air blowing mechanism and 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 signal connected with the electrical control mechanism.

[0061] Meanwhile, the air path mechanism includes an air path box 2 and an air pump, and the gas inlet end of the air path box 2 is communicated with the explosion-proof hot air blowing mechanism through the air pump.

[0062] In addition, the explosion-proof hot air blowing mechanism includes an air inlet pipe 22, a connecting pipe 21 and a heating pipe 20.

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

[0064] The air inlet pipe 22 is communicated with the air pump and used to provide air flow.

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

[0066] Meanwhile, the heating pipe 20 is provided with a heating cavity 23, the heating component is a heating rod core 24, and the heating rod core 24 is arranged in the heating cavity 23 and can generate heat after being electrified.

[0067] In addition, the axes of the air inlet pipe 22, the connecting pipe 21 and the heating pipe 20 coincide, and the heating rod core 24 is arranged around the axis of the heating pipe 20.

[0068] The purpose of such design is that the gas is delivered to the air inlet pipe 22 through the gas pump via the gas passage connected with the gas box, the connecting pipe 21 is inserted into the upper part of the column cavity, and then the two sides thereof are communicated with the air inlet pipe and the heating pipe through the threaded structure, so that the air input from the air inlet pipe can enter the heating pipe via the connecting pipe, and the heating rod core is arranged in the heating pipe, which is usually electrically heated, so that the temperature in the heating pipe can be heated to 400 DEG C at most, and the column cavity is heated by the hot air flow discharged or blown, and the maximum temperature of the column cavity is 260 DEG C.

[0069] Meanwhile, the first temperature control unit 25 is arranged below the heating pipe 20 and is used for collecting the temperature in the column cavity, and the second temperature control unit 26 is arranged at the air outlet of the heating pipe 20, so that the air is heated by the heating rod core to form an air bath heating and heat the column box.

[0070] Meanwhile, the display panel 3 is arranged in the embodiment and is used for displaying various index parameters, and it should be noted that such parameter display is a prior art, which collects data by the sensor in each component and displays after processing.

[0071] Taking an actual product as an example, the multi-temperature-zone gas chromatography analysis system applying air bath heating comprises a device body 1, the top of the device body 1 is provided with a gas box 2, the lower part of the device body 1 is provided with an electrical box and a column box, the electrical box is used for controlling the column box, the gas box 2 is used for supplying gas to the column box, wherein the column box comprises a plurality of column box units, each of the column box units is provided with an explosion-proof hot air blower mechanism, and the plurality of column box units are arranged in an overlapped mode to form a plurality of temperature zones.

[0072] The electrical box is provided with a plurality of electrical box units, and the number of the electrical box units is equal to that of the column box units, and the positions of the electrical box units are matched with those of the column box units.

[0073] Meanwhile, it should be pointed out that the air path structure and the circuit structure in the air path box and the electrical box used in the embodiment are prior art, and the embodiment only superimposes the air path structure and the circuit structure in the prior art to adapt to the collocation of multiple column box units. Those skilled in the art can select according to actual needs when implementing the scheme.

[0074] In the embodiment, a three-column box unit is taken as an example for illustration. The column box comprises a first column box unit, a second column box unit and a third column box unit.

[0075] The electrical control mechanism comprises 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] Meanwhile, the first column box unit comprises a first door plate 7 and a first box body, and the first door plate 7 is arranged at the opening of the first box body, and one end of the first door plate 7 is connected to the side surface of the first box body through a hinge.

[0080] The second column box unit comprises a second door plate 8 and a second box body, and the second door plate 8 is arranged at the opening of the second box body, and one end of the second door plate 8 is connected to the side surface of the second box body through a hinge.

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

[0082] The first door plate 7, the second door plate 8 and the third door plate 9 are further provided with a door plate cover, and a silica gel sealing strip is arranged between the door plate cover and the first door plate 7, the second door plate 8 and the third door plate 9.

[0083] Meanwhile, the first box body, the second box body and the third box body are filled with aluminum silicate fiber insulation boards 19.

[0084] It should be pointed out that in actual design, in order to ensure the sealing of the whole column box unit, in addition to setting the door plate and the door plate cover, an outer box is arranged in the door plate, and an inner box is arranged in the outer box, that is, the first box body, the second box body and the third box body are all double-layer structures, so that the overall sealing is improved through multi-layer wrapping, the column box unit has good heat preservation and insulation effect by using the filled aluminum silicate fiber board, the influence of the external environment and the adjacent column box units is reduced, and the added silica gel sealing strip cavity, door plate, door plate cover and other structures are not directly connected, preventing high temperature from spreading to the surface of the instrument, avoiding scalding.

[0085] In the embodiment, the first box body is provided with a first column cavity 13, and the first column cavity 13 is provided with a first explosion-proof hot air blower 10 and a first exhaust hole 16;

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

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

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

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

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

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

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

[0093] S1. The first temperature control unit 25 and the second temperature control unit 26 respectively collect the temperature in the column box unit and the temperature in the explosion-proof hot air blower mechanism, and transmit the temperature to the electrical control mechanism;

[0094] S2. The electrical control mechanism compares the test sample temperature threshold value to generate a temperature adjustment strategy;

[0095] S3. 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 blower mechanism based on the temperature adjustment strategy.

[0096] Meanwhile, in the specific implementation, the temperature adjustment strategy includes that the temperature of the explosion-proof hair dryer mechanism is within the threshold value and the temperature in the column box unit needs to be raised, the temperature of the explosion-proof hair dryer mechanism is within the threshold value and the temperature in the column box unit needs to be kept, the temperature of the explosion-proof hair dryer mechanism is within the threshold value and the temperature in the column box unit needs to be lowered, and the temperature of the explosion-proof hair dryer mechanism exceeds the threshold value;

[0097] When the temperature of the explosion-proof hair dryer mechanism is within the threshold value and the temperature in the column box unit needs to be raised, the electrical control mechanism increases the power of the heating 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 column box unit needs to be kept;

[0098] When the temperature of the explosion-proof hair dryer mechanism is within the threshold value and the temperature in the column box unit needs to be kept, the electrical control mechanism controls the heating rod and the air pump to keep the current power;

[0099] When the temperature of the explosion-proof hair dryer mechanism is within the threshold value and the temperature in the column box unit needs to be lowered, the electrical control mechanism reduces the power of the heating rod while increasing the power of the air pump 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 column box unit needs to be kept;

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

[0101] It should be noted that since the temperature in the heating pipe can be raised to 400℃ at most, and the column cavity is provided with various collection components, the maximum temperature thereof is about 260℃, so under normal circumstances, the temperature of the column box unit will not be raised when the temperature of the explosion-proof hair dryer mechanism exceeds the threshold value.

[0102] Under normal circumstances, the column box temperature control is the main control, and the explosion-proof hair dryer mechanism temperature control is the secondary control. The two controls the temperature at the same time. The secondary control mainly protects the hair dryer, and the main control controls the temperature of the column box. The main control temperature can be set according to actual needs, and the temperature and the heating rate can be set in multiple sections.

[0103] Meanwhile, the hair dryer serves as both a heating element and a heat dissipation element. When heat dissipation is needed, the electrical control mechanism controls the heating rod in the hair dryer to reduce the power until it stops working, and the air pump connected to the explosion-proof hair dryer mechanism continues to work, thereby continuously filling air into the column box to lower the temperature.

[0104] Although the present application has been described in detail with reference to the foregoing embodiments, the technical solutions recorded in the foregoing embodiments can be modified, or some of the technical features can be replaced by equivalent features, by those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-temperature zone gas chromatographic analysis system employing air bath heating, characterized in that, The air path mechanism, the electrical control mechanism and the column box are included; Two or more column box units are arranged in the column box, and the two or more column box units are arranged in an overlapped manner to form multiple temperature zones; each column box unit is provided with a column cavity, and an explosion-proof hot air blowing mechanism and a temperature control mechanism are arranged in the column cavity; The explosion-proof hot air blowing mechanism is in communication 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 explosion-proof hot air blowing mechanism and the temperature in the column box unit, and transmit the temperature to the electrical control mechanism; The air path mechanism is used to provide the air flow for the explosion-proof hot air blowing mechanism; The electrical control mechanism is used to adjust the temperature in the explosion-proof hot air blowing mechanism, the temperature in the column box unit and the air flow rate of the air path mechanism; The column cavity is further provided with an exhaust hole, and the air flow input from the explosion-proof hot air blowing mechanism can be discharged from the exhaust hole; 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 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 in signal connection with the electrical control mechanism; The application of the multi-temperature zone gas chromatography analysis system with air bath heating to realize temperature control includes the following steps: S1. The first temperature control unit (25) and the second temperature control unit (26) collect the temperature in the column box unit and the temperature in the explosion-proof hot air blowing mechanism respectively, and transmit the temperature to the electrical control mechanism; S2. The electrical control mechanism compares the temperature threshold value of the test sample, and generates a temperature adjustment strategy; S3. Based on the temperature adjustment 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; The temperature adjustment strategy includes that the temperature of the explosion-proof hot air blowing mechanism is within the threshold value and the temperature in the column box unit needs to be raised, the temperature of the explosion-proof hot air blowing mechanism is within the threshold value and the temperature in the column box unit needs to be kept, the temperature of the explosion-proof hot air blowing mechanism is within the threshold value and the temperature in the column box unit needs to be lowered, and the temperature of the explosion-proof hot air blowing mechanism exceeds the threshold value; When the temperature of the explosion-proof hot air blowing mechanism is within the threshold value 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 judges that the temperature in the column box unit needs to be kept; When the temperature of the explosion-proof hot air blowing mechanism is within the threshold value and the temperature in the column box unit needs to be kept, the electrical control mechanism controls the heating core rod and the air pump to keep the current power; When the temperature of the explosion-proof hot air blowing mechanism is within the threshold value and the temperature in the column box unit needs to be lowered, the electrical control mechanism reduces the power of the heating core rod while increasing the power of the air pump 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 judges that the temperature in the column box unit needs to be kept; When the temperature of the explosion-proof hot air blowing mechanism exceeds the 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.

2. The multi-temperature zone gas chromatography system heated with air bath according to claim 1, characterized in that, The first temperature control unit (25) and the second temperature control unit (26) are K-type thermocouples.

3. The multi-temperature zone gas chromatography system heated with air bath according to claim 1, characterized in that, The air path mechanism comprises an air path box (2) and an air pump, and the air outlet of the air path box (2) is communicated with the explosion-proof hot air blower mechanism via the air pump; the explosion-proof hot air blower 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 with the heating pipe (20), and the other end is connected with the air inlet pipe (22), and the connecting pipe (21) passes through the column box unit; The air inlet pipe (22) is communicated with the air pump, and is used for providing air flow; The heating pipe (20) is located in the column box unit, and the heating pipe (20) is provided with a heating component.

4. The multi-temperature zone gas chromatography system heated with air baths of claim 3, wherein, The heating pipe (20) is provided with a heating cavity (23), the heating component is a heating rod core (24), and the heating rod core (24) is arranged in the heating cavity (23), and the heating rod core (24) can generate heat after being electrified.

5. The multi-temperature zone gas chromatography system heated with air baths of claim 4, wherein, The axes of the air inlet pipe (22), the connecting pipe (21) and the heating pipe (20) coincide, and the heating rod core (24) is arranged around the axis of the heating pipe (20).

6. The multi-temperature zone gas chromatography system heated with air bath according to any one of claims 1 to 5, characterized in that, The column box unit is filled with aluminum silicate fiber insulation board (19).

Images