Temperature control detection equipment of gas chromatographic column oven

Abstract

The invention relates to the technical field of column oven temperature control, and discloses a temperature control detection device of a gas chromatography column oven. The temperature control detection assembly is used for detecting the temperature in the box body and performing real-time control; the heating part is used for gasifying and heating the interior of the box body; and the temperature control detection assembly is arranged in the box body. According to the temperature control detection equipment of the gas chromatographic column oven, automatic temperature control after sample injection of the vaporizing chamber can be achieved through the arranged temperature control detection assembly, the internal vaporizing degree is automatically judged according to weight setting, then output detection of gas flow and independent temperature control are achieved, manual adjustment of operators is not needed, and the working efficiency is improved. The temperature control detection assembly can automatically achieve temperature rising and stopping according to the gasification degree, the result in the detection process is guaranteed, errors are reduced, meanwhile, it can be guaranteed that gasified samples are not subjected to follow-up influences generated by ultra-high temperature, and the fluency of temperature control detection and the data accuracy are improved.

Description

Technical Field

[0001] The invention relates to the technical field of temperature control of a column oven, in particular to a temperature control detection device for a gas chromatography column oven. Background Art

[0002] Gas chromatography is a mature separation and analysis method, which plays a very important role in the fields of drug analysis, environmental analysis, organic and inorganic chemical analysis, etc. In conventional gas chromatography, the working temperature of the chromatographic column is 30℃~450℃, but for the quantitative analysis of some special gases such as hydrogen isotopes protium, deuterium and tritium, it is necessary to work at -196℃~450℃, where low temperature is used to achieve gas separation on the chromatographic column, and high temperature is used for pretreatment and activation of the chromatographic column.

[0003] At present, the gas chromatograph is mainly detected and controlled by a column oven, and the temperature control inside the column oven is particularly important, because when the injector injects the test sample, it needs to be heated and vaporized, and then separated and purified in the chromatographic column with the air flow, and then enter the detector for detection, and convert it into an electrical signal, and the data is represented in the form of a spectrum. However, the temperature control in the column oven is generally controlled by manual adjustment. If the vaporization temperature of the sample is 100°C, the temperature is adjusted to this temperature. This treatment method can easily cause incomplete vaporization of the internal sample, resulting in detection errors. However, if it is set to a higher temperature, the higher temperature will cause high-temperature changes in the vaporized sample, and the energy consumption is too large, which will cause errors in the detection results from the side. Therefore, a temperature control detection device for a gas chromatography column oven is proposed to solve the above-mentioned problems. Summary of the invention

[0004] Technical issues solved In view of the deficiencies in the prior art, the present invention provides a temperature control detection device for a gas chromatography column oven, which solves the problem in the prior art that the temperature in the column oven cannot be autonomously gasified and regulated, resulting in partial liquefaction of the gas during the flow process, blocking subsequent circulation and affecting subsequent detection results.

[0005] (II) Technical solution To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a temperature control and detection device for a gas chromatography column oven, comprising a box body; a temperature control and detection component, used to detect the temperature inside the box body and perform real-time control; a heating component, used to gasify and heat the interior of the box body; the temperature control and detection component is arranged inside the box body, and the temperature control and detection component includes a gasification control device, a circulation temperature control device and a detector; the gasification control device is used to control the sample after injection to achieve complete gasification and circulation, and the circulation temperature control device is used to re-control the temperature of the condensate state of the product during the circulation process.

[0006] Preferably, a first cavity, a second cavity and a third cavity are opened inside the box body, the gasification control device is arranged inside the first cavity, the flow temperature control device is arranged inside the second cavity, and the detector is arranged inside the third cavity.

[0007] Preferably, the gasification control device includes an injection seat, which is installed on a box body, an airflow box is arranged below the injection seat, a carrying box is arranged inside the airflow box, a baffle plate is connected to the bottom of the carrying box, the surface of the baffle plate is slidably connected to the inside of the airflow box, a guide rod is connected to the bottom of the baffle plate, a second spring is sleeved on the surface of the guide rod, and the top of the second spring is connected to the bottom of the airflow box.

[0008] Preferably, left-right symmetrical and staggered plug plates are installed on the inner wall of the carrying box, air flow holes are opened on the carrying box, a convex groove is provided on the air flow box, an air pipe is connected to the bottom of the air flow box, an air intake pipe is connected to the air flow box, and an air blocking plate is connected to one side of the carrying box.

[0009] Preferably, the airflow box is connected to a branch pipe, a sleeve is slidably connected to the surface of the branch pipe, a rotating seat is rotatably connected to the inside of the box, a control key is provided on one side of the rotating seat, one end of the control key is connected to a first spring, the control key is slidably connected to the inside of the box, and the control key is electrically connected to the heating component to control the start and stop of the heating component.

[0010] Preferably, both ends of the sleeve are connected to air storage pipes, the interior of the air storage pipe is connected to a sliding sheet via a sliding groove, and one side of the sliding sheet is connected to a third spring.

[0011] Preferably, the circulation temperature control device includes a chromatographic column, which is arranged inside the second cavity, one end of the chromatographic column is connected to the air pipe, and the other end of the chromatographic column is connected to the detector through a connecting piece, the bottom of the chromatographic column contacts a supporting seat, the bottom of the supporting seat is connected to a pressure rod, the surface of the pressure rod is sleeved with a compression spring, and the pressure rod is slidably connected to the inside of the box.

[0012] Preferably, a straight rod is connected to the bearing seat, a pinion is meshed on the straight rod, a rotating shaft is connected to the axis of the pinion, an electrode sheet is connected to the rotating shaft, a contact sheet electrically in contact with the electrode sheet is provided inside the box, and the contact sheet is electrically connected to the heating component.

[0013] Preferably, the connecting member includes an air intake cylinder, a plurality of spacers are arranged inside the air intake cylinder, the spacers are of a conical structure, and a gap is arranged between the spacers and the inner wall of the air intake cylinder.

[0014] (III) Beneficial effects Compared with the prior art, the present invention provides a temperature control detection device for a gas chromatography column oven, which has the following beneficial effects: 1. The temperature control detection equipment of the gas chromatography column oven can realize automatic temperature control of the vaporization chamber after sampling through the set temperature control detection component, automatically judge the internal vaporization degree according to the weight setting, and then realize the output detection of the airflow and autonomous temperature control. There is no need for manual adjustment by the operator. The temperature control detection component can automatically increase and stop the temperature according to the degree of vaporization, ensure the results in the detection process, reduce errors, and at the same time ensure that the vaporized samples will not be affected by the subsequent effects of ultra-high temperature, thereby improving the fluency of temperature control detection and data accuracy.

[0015] 2. The temperature control and detection equipment of the gas chromatography column oven can autonomously detect the gas flowing through the chromatograph through the flow temperature control device. When liquefaction occurs during gas circulation, the electrical contact of the heating component is continuously heated according to the weight of the chromatograph at the time of liquefaction, thereby ensuring the autonomous heating of the second cavity, and then the liquefied sample is vaporized again, thereby ensuring the fluidity and stability of the channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a temperature control detection device for a gas chromatography column oven proposed by the present invention; Figure 2 This is a schematic diagram of the overall cross-sectional structure of a temperature control detection device for a gas chromatography column oven proposed by the present invention; Figure 3 A schematic diagram of the structure of a temperature control detection component of a temperature control detection device for a gas chromatography column oven proposed by the present invention; Figure 4 A schematic structural diagram of a gasification control device for a temperature control detection device of a gas chromatography column oven proposed by the present invention; Figure 5 A schematic diagram of the connection structure of a rotating seat of a temperature control detection device of a gas chromatography column oven proposed by the present invention; Figure 6 A schematic diagram of the cross-sectional internal structure of a gas flow box of a temperature control detection device for a gas chromatography column oven proposed by the present invention; Figure 7 A schematic diagram of the structure of a flow temperature control device of a temperature control detection device for a gas chromatography column oven proposed by the present invention; Figure 8 The present invention provides a schematic diagram of the cross-sectional structure of an air inlet cylinder of a temperature control and detection device for a gas chromatography column oven.

[0017] In the figure: 1, box; 2, first cavity; 3, second cavity; 4, third cavity; 5, temperature control detection component; 501, injection seat; 502, carrying box; 503, plug board; 504, air flow box; 505, air inlet pipe; 506, control key; 507, first spring; 508, baffle plate; 509, guide rod; 510, second spring; 511, air pipe; 512, convex groove; 513, sleeve ; 514, branch pipe; 515, rotating seat; 516, third spring; 517, sliding plate; 518, gas storage tube; 519, chromatographic column; 520, straight rod; 521, bearing seat; 522, pressure rod; 523, compression spring; 524, rotating shaft; 525, pinion; 526, contact plate; 527, electrode plate; 528, air inlet cylinder; 529, spacer; 6, air flow hole; 7, air blocking plate. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-Figure 8 A temperature control and detection device for a gas chromatography column oven comprises a box body 1; a first cavity 2, a second cavity 3 and a third cavity 4 are provided inside the box body 1, a gasification control device is arranged inside the first cavity 2, a flow temperature control device is arranged inside the second cavity 3, and a detector is arranged inside the third cavity 4.

[0020] In this embodiment, the temperature control detection component 5 is used to detect the temperature inside the box 1 and perform real-time control; the heating component is used to vaporize and heat the interior of the box 1; the temperature control detection component 5 is arranged inside the box 1, and the temperature control detection component 5 includes a vaporization control device, a circulation temperature control device and a detector.

[0021] For further information, see Figure 3-Figure 4The gasification control device includes an injection seat 501, which is installed on the box body 1. An airflow box 504 is arranged below the injection seat 501. A carrying box 502 is arranged inside the airflow box 504. The bottom of the carrying box 502 is connected with a baffle plate 508. The surface of the baffle plate 508 is slidably connected to the inside of the airflow box 504. The bottom of the baffle plate 508 is connected with a guide rod 509. The surface of the guide rod 509 is sleeved with a second spring 510. The top of the second spring 510 is connected to the bottom of the airflow box 504. The entire carrying box 502 will drive the baffle plate 508 to sink due to the weight of the liquid, and then the second spring 510 will be lengthened through the downward movement of the guide rod 509. The weight of the entire sample is used as the detection condition. When the sample is vaporized, its weight will disappear. After the blocking plate 508 bears the weight, it will block the passage of the air pipe 511 and convert the passage of the vaporization chamber into a sealed passage. Only when the sample is completely vaporized and the weight disappears, the passage will be opened.

[0022] For further information, see Figure 4 and Figure 6 , the inner wall of the carrying box 502 is installed with symmetrical and staggered plug plates 503. The liquid will enter the plug plate 503 on the highest layer. After it is fully loaded, the staggered structure can make it overflow on the plug plate 503 on the second layer. In this way, the sample is finally divided into multiple areas, which is finally convenient for subsequent gasification operations. The carrying box 502 is provided with air flow holes 6, the air flow box 504 is provided with convex grooves 512, the bottom of the air flow box 504 is connected to the air pipe 511, the air flow box 504 is connected to the air inlet pipe 505, and one side of the carrying box 502 is connected to the air blocking plate 7. In the process of the carrying box 502 rising and resetting, the air blocking plate 7 will be synchronously driven to move upward, thereby exposing the pipeline of the air inlet pipe 505, so at this time, the air source external to the air inlet pipe 505 will drive the sample gas to synchronously enter the interior of the chromatographic column 519.

[0023] Also, see Figure 4 , the airflow box 504 is connected with a branch pipe 514, the surface of the branch pipe 514 is slidably connected with a sleeve 513, the interior of the box body 1 is rotatably connected with a rotating seat 515, one side of the rotating seat 515 is provided with a control key 506, one end of the control key 506 is connected with a first spring 507, the control key 506 is slidably connected to the interior of the box body 1, and the control key 506 is electrically connected to the heating component to control the start and stop of the heating component. When the sleeve 513 is continuously injected with airflow, it will slide in the branch pipe 514. Because the airflow has a certain driving force, it will push it to slide on the branch pipe 514 at this time, and then drive the rotating seat 515 to contact and drive it to rotate. After rotating, it will contact the control key 506, so that it is in contact and connected, and then the heating component is pressed and electrically contacted, and then the heating component is controlled to stop heating, so as to achieve temperature control and keep working at this temperature.

[0024] In addition, see Figure 4 , gas storage tubes 518 are connected to both ends of the sleeve 513, and a sliding sheet 517 is connected to the inside of the gas storage tube 518 through a sliding groove, and a third spring 516 is connected to one side of the sliding sheet 517. The purpose of the gas storage tube 518 is to temporarily store the gasified sample, otherwise the internal space may be insufficient. After complete gasification, the air flow channel is opened, and the third spring 516 inside the gas storage tube 518 will provide elastic force to push the sliding sheet 517 to reset, and finally squeeze the internal air to release, and finally flow into the interior of the chromatographic column 519.

[0025] It is worth noting that see Figure 7 The circulation temperature control device includes a chromatographic column 519, whose core functions include separation of compounds in a mixture and quantitative and qualitative analysis. The gas chromatography column uses the difference in interaction force between the stationary phase and the mobile phase to make different compounds move at different speeds in the column, thereby achieving effective separation of compounds in the mixture. The chromatographic column 519 is arranged inside the second cavity 3, one end of the chromatographic column 519 is connected to the air pipe 511, and the other end of the chromatographic column 519 is connected to the detector through a connector. The bottom of the chromatographic column 519 contacts a bearing seat 521, and the bottom of the bearing seat 521 is connected to a pressure rod 522, and the surface of the pressure rod 522 is sleeved with a compression spring 523, and the pressure rod 522 is slidably connected to the inside of the box 1. As the airflow surges, condensation may occur in the chromatographic column 519. After a long period of accumulation, the channel will be blocked. When the liquid accumulated in the chromatographic column 519 gradually increases, its weight will also change accordingly. Then the entire chromatographic column 519 will sink a certain distance, and then the supporting seat 521 will be mobilized to press down. After the supporting seat 521 sinks, the small gear 525 will be driven to rotate through the teeth on the straight rod 520, which will serve as a mark for triggering detection. Because as long as liquefaction occurs, the weight of its various components will increase accordingly, which will serve as a trigger condition, and then automatically control the start-up and heating of the heating component.

[0026] It is worth mentioning that please refer to Figure 7, a straight rod 520 is connected to the bearing seat 521, a pinion 525 is meshed on the straight rod 520, a rotating shaft 524 is connected to the axis of the pinion 525, an electrode sheet 527 is connected to the rotating shaft 524, a contact sheet 526 electrically in contact with the electrode sheet 527 is arranged inside the box 1, and the contact sheet 526 is electrically connected to the heating component, and the pinion 525 is driven to rotate through the teeth on the straight rod 520, thereby driving the electrode sheet 527 on the rotating shaft 524 to rotate, and then contacting the contact sheet 526 to achieve conduction, and then driving the heating component to continue to heat up, and after heating up, the internal sample of the second cavity 3 is gasified to ensure that it can achieve smooth flow of airflow and improve the accuracy of the detection data results. The heating component is automatically controlled by this mechanical action, and the automatic heating and re-gasification are achieved to prevent the liquefied gas from entering the interior of the detector.

[0027] See also Figure 8 The connecting piece includes an air inlet cylinder 528, and a plurality of spacers 529 are arranged inside the air inlet cylinder 528. The spacers 529 are of a conical structure, and a gap is arranged between the spacers 529 and the inner wall of the air inlet cylinder 528. The plurality of conical spacers 529 can accelerate the sample airflow in the center, and can increase the contact area between the sample airflow and the spacers 529, thereby blocking the water vapor that is about to condense, so that it adheres to the spacers 529, and then, with the setting of the inclined surface, it will slide down layer by layer from the inside of the air inlet cylinder 528 to the inside of the chromatographic column 519. Because if the airflow is not pure, the detector detection data will be inaccurate, and the structure of the detector is mainly responsible for converting the concentration or mass change of the components separated by the chromatographic column into a measurable electrical signal for recording and analysis.

[0028] Working principle: First, the tester needs to use a syringe to inject the sample to be tested from the position of the injection seat 501 into the inside of the carrying box 502. The purpose of setting the staggered plug board 503 inside the carrying box 502 is to vertically divide the sample, because during the injection process, the liquid will enter the plug board 503 on the highest layer, and then after it is fully loaded, the staggered structure can make it overflow on the plug board 503 on the second layer, and in this way, the sample will eventually be divided into multiple areas. After that, the entire carrying box 502 will be driven by the weight of the liquid to drive the barrier plate 508 to sink, and then the guide rod 509 will slide down to lengthen the second spring 510. After that, the heating component will heat up with the pressing of the starter, and the heating component can heat up the first cavity 2, the second cavity 3 and the third cavity 4 synchronously, that is, the interconnected state. The temperature in the cavity gradually increases. When it reaches the vaporization point of the sample, the sample inside will gradually vaporize. The split setting can improve the efficiency of vaporization. The vaporized sample, that is, the sample airflow will be discharged along with the thermal expansion of the position of the airflow hole 6, and then enter the interior of the sleeve 513 through the branch pipe 514. The sleeve 513 is continuously injected with airflow and will slide in the branch pipe 514. Because the airflow has a certain driving force, it will push it to slide on the branch pipe 514, and then drive the rotating seat 515 to contact and rotate. After rotation, it will contact the control key 506, so that it is in contact and connected, and then the heating component is pressed and electrically contacted to control its temperature rise to stop, so as to achieve heat preservation. Because the sample The gasification point has been reached, and it only needs to wait for complete gasification. When the internal sample continues to gasify, the gas has no channel to flow, and will enter the gas storage pipes 518 at both ends from the position of the sleeve 513. The air pressure will push the sliding sheet 517 to slide, and then compress the third spring 516 to provide a gas retention space. When the sample inside the carrying box 502 is completely gasified, the weight disappears, and then the second spring 510 contracts, and then drives the carrying box 502 on the baffle plate 508 to move up and reset, and then a flow channel for air flow is generated. The air flow will enter the position of the convex groove 512 from the space between the carrying box 502 and the air flow box 504, bypass the baffle plate 508 to enter its bottom, and then enter the inside of the chromatographic column 519 from the bottom air pipe 511. In addition, during the process of the carrying box 502 rising and resetting, it will synchronously drive the baffle plate 7 to move up, thereby exposing the pipeline of the air inlet pipe 505, so at this time, the air source external to the air inlet pipe 505 will drive the sample gas to synchronously enter the inside of the chromatographic column 519.After the airflow enters the chromatographic column 519, it is then injected into the detector through the interior of the air inlet cylinder 528 to achieve gas detection. The multiple conical spacers 529 provided can accelerate the sample airflow in the center, and can increase the contact area between the sample airflow and the spacers 529, thereby blocking the water vapor that is about to condense and making it adhere to the spacers 529. Then, with the setting of the inclined surface, it will slide down layer by layer from the interior of the air inlet cylinder 528 to the interior of the chromatographic column 519. Then, as the liquid accumulated in the chromatographic column 519 gradually After the increase, its weight will also change accordingly, and then the entire chromatographic column 519 will sink a certain distance, and then the bearing seat 521 will be mobilized to press down. After the bearing seat 521 sinks, the teeth on the straight rod 520 will drive the pinion 525 to rotate, and then drive the electrode sheet 527 on the rotating shaft 524 to rotate, and then contact the contact sheet 526 to achieve conduction, and then drive the heating component to continue to heat up. After the temperature is raised, the internal sample of the second cavity 3 is gasified to ensure that it can achieve the smooth flow of airflow and improve the accuracy of the detection data results. After that, the detector detects the gas, discharges the tail gas, and finally after signal processing, the data is represented by the form of a spectrum. The actual first cavity 2 is a vaporization chamber. According to the detection of weight, the control of the heating component can be achieved, and then the control of temperature can be achieved. Therefore, the overall automatic temperature control detection can be achieved without manual control by the operator. It only needs to inject the sample into the interior of the vaporization chamber. With the autonomous rise of temperature, the change in weight after complete gasification automatically opens the connecting channel to achieve the dredging and detection of airflow.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A temperature control detection device for a gas chromatography column oven, characterized in that: include Box (1); A temperature control detection component (5) is used to detect the temperature inside the box (1) and perform real-time control; A heating component, used to gasify and heat the interior of the box (1); The temperature control detection component (5) is arranged inside the box (1), and the temperature control detection component (5) comprises a gasification control device, a circulation temperature control device and a detector; The gasification control device is used to control the sample after injection to achieve complete gasification and circulation, and the circulation temperature control device is used to re-control the temperature of the condensation state of the product during the circulation process.

2. The temperature control detection device for a gas chromatography column oven according to claim 1, characterized in that: The box body (1) is provided with a first cavity (2), a second cavity (3) and a third cavity (4); the gasification control device is arranged inside the first cavity (2), the flow temperature control device is arranged inside the second cavity (3), and the detector is arranged inside the third cavity (4).

3. The temperature control detection device for a gas chromatography column oven according to claim 1, characterized in that: The gasification control device comprises an injection seat (501), wherein the injection seat (501) is mounted on a box body (1), an airflow box (504) is arranged below the injection seat (501), a carrying box (502) is arranged inside the airflow box (504), a baffle plate (508) is connected to the bottom of the carrying box (502), the surface of the baffle plate (508) is slidably connected to the inside of the airflow box (504), a guide rod (509) is connected to the bottom of the baffle plate (508), a second spring (510) is sleeved on the surface of the guide rod (509), and the top of the second spring (510) is connected to the bottom of the airflow box (504).

4. The temperature control detection device for a gas chromatography column oven according to claim 3, characterized in that: The inner wall of the carrying box (502) is provided with left-right symmetrical and staggered plug plates (503), the carrying box (502) is provided with air flow holes (6), the air flow box (504) is provided with a convex groove (512), the bottom of the air flow box (504) is connected to an air pipe (511), the air flow box (504) is connected to an air intake pipe (505), and one side of the carrying box (502) is connected to an air blocking plate (7).

5. The temperature control detection device for a gas chromatography column oven according to claim 4, characterized in that: The airflow box (504) is connected to a branch pipe (514), the surface of the branch pipe (514) is slidably connected to a sleeve (513), the interior of the box body (1) is rotatably connected to a rotating seat (515), one side of the rotating seat (515) is provided with a control key (506), one end of the control key (506) is connected to a first spring (507), the control key (506) is slidably connected to the interior of the box body (1), and the control key (506) is electrically connected to a heating component to control the start and stop of the heating component.

6. The temperature control detection device for a gas chromatography column oven according to claim 5, characterized in that: Both ends of the sleeve (513) are connected to an air storage pipe (518), the interior of the air storage pipe (518) is connected to a sliding sheet (517) via a sliding groove, and one side of the sliding sheet (517) is connected to a third spring (516).

7. The temperature control detection device for a gas chromatography column oven according to claim 6, characterized in that: The circulation temperature control device comprises a chromatographic column (519), wherein the chromatographic column (519) is arranged inside the second cavity (3), one end of the chromatographic column (519) is connected to the air pipe (511), and the other end of the chromatographic column (519) is connected to the detector via a connecting piece, the bottom of the chromatographic column (519) contacts a supporting seat (521), the bottom of the supporting seat (521) is connected to a pressure rod (522), the surface of the pressure rod (522) is sleeved with a compression spring (523), and the pressure rod (522) is slidably connected to the inside of the box (1).

8. The temperature control detection device for a gas chromatography column oven according to claim 7, characterized in that: The bearing seat (521) is connected to a straight rod (520), a pinion gear (525) is meshed on the straight rod (520), a rotating shaft (524) is connected to the axis of the pinion gear (525), an electrode sheet (527) is connected to the rotating shaft (524), a contact sheet (526) electrically in contact with the electrode sheet (527) is provided inside the box (1), and the contact sheet (526) is electrically connected to the heating component.

9. The temperature control detection device for a gas chromatography column oven according to claim 8, characterized in that: The connecting member comprises an air intake cylinder (528), a plurality of spacers (529) are arranged inside the air intake cylinder (528), the spacers (529) are of a conical structure, and a gap is arranged between the spacers (529) and the inner wall of the air intake cylinder (528).

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