A gas chromatograph oven column heater

Abstract

The utility model discloses a kind of gas chromatographs even heating column temperature boxes, the utility model relates to chromatograph technical field, including heat preservation box, inside formation temperature control cavity, its bottom edge is equipped with air outlet net plate and multiple rotary joints;Heat insulation cover, cover in heat preservation box top, the middle part of the heat insulation cover is provided with air inlet net plate;Heating mechanism, including first motor, mounting bracket and heater, the first motor drives heater to rotate heating in temperature control cavity;Heat dissipation mechanism, including second motor, transmission shaft, fan blade and air inlet fan blade, for the heat even distribution in temperature control cavity.This gas chromatograph even heating column temperature box, using the mode of rotary heating and heat dissipation mechanism collaborative work, heater is driven by first motor 360 ° rotary heating, cooperate heat dissipation mechanism and evenly spread cold air, so that temperature control cavity radial and axial temperature can be evenly distributed, avoid local overheating, greatly improve the effect of sample separation in chromatographic column.

Description

Technical Field

[0001] This utility model relates to the field of chromatography technology, specifically to a gas chromatograph homogenization column oven. Background Technology

[0002] Gas chromatography (GC) is an instrument that uses chromatographic separation and detection techniques to perform qualitative and quantitative analysis of complex mixtures of multiple components. It is typically used to analyze thermally stable organic compounds in soil with boiling points not exceeding 500℃, such as volatile organic compounds, organochlorines, organophosphorus compounds, polycyclic aromatic hydrocarbons, and phthalates. In GC, samples are injected via an injector and then separated into groups within a capillary column in a heated chamber before being sent to the detection device for analysis. Existing heated chambers use resistance wires to heat the air for homogenization and temperature control, which, while achieving temperature control, is not uniform. Therefore, we propose a homogenizing column oven for gas chromatographs.

[0003] The utility model patent with authorization announcement number CN213580813U discloses a gas chromatograph homogenizing column oven, including a box body. The upper outer surface of the box body is provided with a dustproof and moisture-proof mechanism. The inside of the box body is provided with an inner chamber. The front end of the inner chamber is provided with a fixing screw and a capillary column. The fixing screw is located at the lower end of the capillary column. A temperature control mechanism is provided on one side of the outer surface of the box body. A heating wire is provided on the lower outer surface of the box body. The temperature control mechanism includes a homogenizing layer, a mounting column, a temperature control layer, a support plate, a temperature control device shell, and fixing bolts. The homogenizing layer is located on one side of the temperature control device shell. The mounting column is located at the lower end of the temperature control layer. The temperature control layer and the support plate are both located inside the temperature control device shell.

[0004] As shown in the above-mentioned utility model, the existing gas chromatograph homogenizing column oven can facilitate heating of the gas chromatograph while adding a constant temperature device to ensure uniform temperature and ease of use. However, the existing gas chromatograph homogenizing column oven relies on heating wires and only handles heat through a simple homogenizing layer, which makes it difficult to ensure uniform temperature distribution in all areas of the chamber. This affects the separation effect of the sample in the chromatographic column, resulting in a decrease in the accuracy and repeatability of the detection results. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a gas chromatograph homogenization column oven, thus solving the aforementioned problems.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a gas chromatograph homogenization column oven, comprising:

[0007] The insulated box has an internal temperature control chamber, and its bottom edge is equipped with an air vent and multiple rotating connectors.

[0008] A heat insulation cover is fitted onto the top of the insulated box. An air inlet mesh is provided in the middle of the heat insulation cover, and multiple placement slots arranged in a ring array are provided on the edge of the heat insulation cover.

[0009] The heating mechanism includes a first motor, a mounting bracket, and a heater, wherein the first motor drives the heater to rotate and heat within the temperature control chamber;

[0010] The heat dissipation mechanism, including a second motor, a drive shaft, a fan plate, and an intake fan blade, is used to evenly distribute the heat in the temperature control cavity.

[0011] Preferably, slots are provided on both inner walls of the placement groove, and clamps are inserted into the slots. One end of the clamps is connected to the bottom of the slot via a spring. The two clamps work together to accommodate chromatographic columns of different sizes.

[0012] Preferably, a plurality of connecting rods arranged in a ring array are fixed around the lower opening of the placement groove, and a support plate is fixed at the bottom of the connecting rod. The upper surface of the support plate is provided with a heat-insulating silicone pad to prevent uneven heating of the chromatographic column.

[0013] Preferably, the first motor is installed at the bottom of the inner cavity of the insulation box, and mounting brackets are fixed on both sides of the output shaft of the first motor. The mounting brackets are configured as L-shaped structures, and the two mounting brackets are symmetrically arranged on the outside of multiple connecting rods.

[0014] Preferably, the heater is a spiral resistance wire, which is mounted around a mounting bracket and is driven by a first motor to rotate 360°.

[0015] Preferably, the second motor is installed at the bottom of the inner cavity of the insulation box, and a drive shaft is fixed at the output end of the second motor. The fan blades are distributed in an inclined manner on the outer side of the upper end of the drive shaft, and the fan plates are distributed in a ring array on the outer side of the middle part of the drive shaft.

[0016] Beneficial effects

[0017] This invention provides a homogenizing column oven for gas chromatographs. Compared with the prior art, it has the following advantages:

[0018] 1. The homogenizing column oven of this gas chromatograph adopts a combination of rotary heating and heat dissipation mechanism. The heater rotates 360° under the drive of the first motor, and the heat dissipation mechanism diffuses the cold air evenly, so that the radial and axial temperature in the temperature control chamber can be evenly distributed, avoiding local overheating. This greatly improves the separation effect of samples in the chromatographic column, thereby improving the accuracy and repeatability of the detection results and ensuring the reliability of experimental data.

[0019] 2. The homogenizing column oven of this gas chromatograph has a placement slot with a spring clamp on the heat insulation cover, which can automatically clamp the column according to its size. Together with the bottom support plate and heat insulation silicone pad, it can stably support columns of different diameters and prevent them from shaking. This design not only enhances the stability of the column during the experiment, but also improves the versatility of the device for columns of different sizes, reduces experimental costs, and improves experimental efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 2 This is a top view of the overall structure of this utility model.

[0022] Figure 3 This is a schematic diagram showing the structural positions of the heat insulation cover, heating mechanism, and heat dissipation mechanism of this utility model.

[0023] Figure 4 This is a schematic diagram of the heating mechanism of this utility model.

[0024] Figure 5 This is a schematic diagram of the heat dissipation mechanism of this utility model.

[0025] In the diagram: 1. Insulation box; 11. Exhaust mesh plate; 12. Rotary connector; 2. Heat insulation cover; 21. Inlet mesh plate; 22. Placement slot; 23. Slot; 24. Clamping plate; 25. Connecting rod; 26. Support plate; 3. Heating mechanism; 31. First motor; 32. Mounting bracket; 33. Heater; 4. Heat dissipation mechanism; 41. Second motor; 42. Drive shaft; 43. Fan blade; 44. Inlet fan blade. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-5 This utility model provides two technical solutions:

[0028] First embodiment: A gas chromatograph homogenization column oven includes an insulated box 1, an insulated cover 2, a heating mechanism 3 and a heat dissipation mechanism 4, forming a temperature control cavity inside. The bottom edge of the insulated box 1 is provided with an exhaust mesh plate 11 and multiple rotating connectors 12. The insulated box 1 is made of double-layer heat insulation material, with the inner layer being a high-temperature resistant metal plate and the outer layer being a heat insulation layer, effectively reducing heat loss.

[0029] Specifically, the heat insulation cover 2 is fitted onto the top of the insulated box 1 and is fixedly connected to the insulated box 1 by edge buckles or bolts. An air inlet mesh 21 is provided in the middle of the heat insulation cover 2 for introducing external air or circulating airflow. Multiple placement slots 22 arranged in a circular array are provided along the edge of the heat insulation cover 2. Each placement slot 22 is a cylindrical groove for vertically placing the chromatographic column. Slots 23 are provided on the inner walls of both sides of the placement slots 22. Clamping plates 24 are inserted into the slots 23. The clamping plates 24 are arc-shaped plates, and one end of the clamping plates 24 is connected to the slot 23 by a spring. The bottom of the slot is connected, and two clamping plates 24 are used to adapt to different sizes of chromatographic columns. When different sizes of chromatographic columns are inserted, the clamping plates 24 can slide in the slot 23 and clamp the chromatographic column by spring force to achieve self-adaptive fixation. Multiple connecting rods 25 arranged in a ring array are fixed around the lower opening of the placement slot 22. The bottom of the connecting rods 25 is fixed with a support plate 26. The upper surface of the support plate 26 is provided with a heat-insulating silicone pad. The surface of the silicone pad is provided with anti-slip texture, which can not only support the bottom of the chromatographic column, but also prevent local overheating through heat insulation properties, and at the same time prevent the chromatographic column from shaking.

[0030] More specifically, the heating mechanism 3 includes a first motor 31, a mounting bracket 32, and a heater 33. The first motor 31 drives the heater 33 to rotate and heat within the temperature control chamber. The first motor 31 is fixed to the center of the bottom of the inner cavity of the insulation box 1 by bolts, with its output shaft pointing vertically upward. Two L-shaped mounting brackets 32 (distributed symmetrically at 180°) are symmetrically fixed on both sides of the shaft. The horizontal section of the mounting bracket 32 ​​faces the inner wall of the insulation box 1, while a spiral resistance wire is wound around the vertical section to serve as the heater 33. The resistance wire is tightly wound around the outside of the bracket, forming a cylindrical heating area. One end of the output shaft of the first motor 31 passes through the bottom of the insulation box 1 and connects to an external rotary connector 12. The rotary connector 12 is a conductive slip ring structure, with one end connected to a power source and the other end electrically connected to the heater 33 via a wire, ensuring continuous circuit conduction when the motor drives the heater 33 to rotate, achieving 360° heating without dead angles.

[0031] The second embodiment differs from the first embodiment in that the heat dissipation mechanism 4 includes a second motor 41, a drive shaft 42, a fan plate 43, and an intake fan blade 44, which are used to evenly distribute the heat in the temperature control chamber. The second motor 41 is installed in the middle of the bottom of the inner cavity of the insulation box 1. The output end of the second motor 41 is fixed with the drive shaft 42. 3-5 inclined intake fan blades 44 are evenly distributed on the outer side of the upper end of the drive shaft 42. The intake fan blades 44 are at an angle of 30°-45° with the axis of the drive shaft 42, which are used to draw cold air from the outside downwards. The fan plate 43 is distributed in a ring array on the outer side of the middle part of the drive shaft 42, which is used to evenly diffuse the drawn-in cold air to multiple chromatographic columns.

[0032] When the device is in operation, the heat insulation cover 2 is first placed on the heat insulation box 1 and locked with buckles or bolts to form a closed temperature control chamber. Then, the chromatographic column is vertically inserted into the placement groove 22 of the heat insulation cover 2, with the bottom of the chromatographic column contacting the heat insulation silicone pad of the support plate 26. The two side clamps 24 are clamped to the outer wall of the chromatographic column by the spring force, which can accommodate chromatographic columns of different diameters (such as 3-8mm) to ensure that the column is vertical and stable. Then, the first motor 31 is started to drive the mounting bracket 32 ​​and the heater 33 to rotate at a speed of 1-3r / min, and the spiral resistance wire releases heat evenly. Since the heater 33 rotates around the periphery of the chromatographic column, it avoids the problem of local overheating caused by traditional fixed heating elements, ensuring uniform radial temperature in the temperature control chamber. The rotating connector 12 maintains the power supply of the heater 33 through a conductive slip ring, allowing the motor to rotate continuously without tangling the wires. The second motor 41 drives the transmission shaft 42 to rotate, and the intake fan blades 44 draw in air from the intake mesh plate 21, which is then evenly diffused to multiple chromatographic columns by the fan plate 43, making full contact with the surface of the chromatographic column and forming a uniform axial temperature distribution.

[0033] A temperature sensor (not shown in the figure) can be installed on the connecting rod 25 to monitor the surface temperature of the chromatographic column in real time and feed it back to the control system to adjust the heating power and fan speed, supporting complex temperature control programs such as gradient heating.

[0034] Furthermore, all content not described in detail in this specification is existing technology known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited; conventional equipment can be used.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gas chromatograph homogenizing column oven, characterized in that, include: The insulated box has an internal temperature control chamber, and its bottom edge is equipped with an air vent and multiple rotating connectors. A heat insulation cover is fitted onto the top of the insulated box. An air inlet mesh is provided in the middle of the heat insulation cover, and multiple placement slots arranged in a ring array are provided on the edge of the heat insulation cover. The heating mechanism includes a first motor, a mounting bracket, and a heater, wherein the first motor drives the heater to rotate and heat within the temperature control chamber; The heat dissipation mechanism, including a second motor, a drive shaft, a fan plate, and an intake fan blade, is used to evenly distribute the heat in the temperature control cavity.

2. A heated column oven for a gas chromatograph according to claim 1, characterized in that: Slots are provided on both inner walls of the placement groove. A clamp is inserted into the inside of the slot. One end of the clamp is connected to the bottom of the slot by a spring. The two clamps work together to accommodate chromatographic columns of different sizes.

3. The uniform temperature column oven for a gas chromatograph according to claim 1, wherein: Multiple connecting rods arranged in a circular array are fixed around the lower opening of the placement slot. A support plate is fixed to the bottom of the connecting rods, and a heat-insulating silicone pad is provided on the upper surface of the support plate to prevent uneven heating of the chromatographic column.

4. The uniform column oven for a gas chromatograph according to claim 1, wherein: The first motor is installed at the bottom of the inner cavity of the insulation box. The output shaft of the first motor is fixed with mounting brackets on both sides. The mounting brackets are set in an L-shape and the two mounting brackets are symmetrically arranged on the outside of multiple connecting rods.

5. A heated column oven for a gas chromatograph according to claim 4, wherein: The heater is a spiral resistance wire, which is mounted on a mounting bracket and is driven by a first motor to rotate 360°.

6. The uniform-heating column oven for a gas chromatograph according to claim 1, characterized by: The second motor is installed at the bottom of the inner cavity of the insulation box. The output end of the second motor is fixed with a drive shaft. The fan blades are distributed in an inclined manner on the outer side of the upper end of the drive shaft, and the fan plates are distributed in a ring array on the outer side of the middle part of the drive shaft.

Images