Temperature control device based on optical gas pool

Abstract

The utility model discloses a temperature control device based on an optical gas pool, which comprises a heat insulation cotton shell, heat conduction fins and a semiconductor chilling plate, the heat conduction fins and the semiconductor chilling plate are arranged in the heat insulation cotton shell, the optical gas pool is wrapped and fixed through heat insulation cotton, and an airflow channel is formed between the heat insulation cotton shell and the semiconductor chilling plate. Air flow in the heat preservation cotton shell forms circulation; the device effectively solves the problems of slow preheating, poor thermal stability and the like of a traditional common heating mode, is high in temperature control precision, and can be used for rapidly and stably heating the optical gas pool. Meanwhile, the thermal insulation cotton is used for positioning the optical gas pool, so that stress deformation of the optical gas pool caused by non-concentricity of a conventional tight fixing mode is avoided, and the measurement precision is improved. According to the scheme, by combining the ingenious design of the heat preservation cotton shell, hot air flows stably and circularly, and stable heating of the gas pool is achieved; the heat preservation cotton has the functions of heat preservation, airflow guiding and gas pool fixing, the measurement accuracy is improved, the structural design is ingenious, and the practical value is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of greenhouse gas monitoring, and in particular relates to a high-precision temperature control device based on an optical gas cell, which ensures the stability of the equipment by accurately controlling the temperature of the optical gas cell. Background Art

[0002] An optical gas cell (also called an optical gas chamber) is a device that reflects incident light back and forth in the gas chamber, so that the effective optical path can be significantly increased. It includes a cavity ring-down gas cell, an infrared gas cell, an ultraviolet gas cell, a laser gas cell, etc. For example, taking the use of a cavity ring-down gas cell as an example, in CRDS measurement, temperature control is directly related to the stability of the equipment; the cavity ring-down gas cell is very sensitive to temperature, and a small temperature fluctuation will immediately cause a deviation in the measurement result. The structures currently used at home and abroad generally include an outer insulation box, an insulation layer, and an inner insulation box. The cavity ring-down gas cell is clamped at both ends by a fixing clamp, and multiple sets of temperature sensors are attached to the cavity ring-down gas cell to monitor the temperature. The interior of the insulation box is generally heated by automatic diffusion through the heat sink.

[0003] For example, the invention patent with publication number CN116519873A discloses a greenhouse gas measurement device based on a high-stability ring-down cavity, which uses multiple fans to achieve temperature control. However, due to the disordered airflow of the fans, the temperature difference in different areas of the gas pool is large, affecting the temperature control accuracy. Figure 3 As shown in the figure, the two ends of the cavity ring-down gas pool are clamped by fixing clips. Because the light path in the gas pool is reflected back and forth tens of thousands of times, a slight deformation will cause a large deviation. If the two fixing clips are not concentric, deformation will occur after locking, which will seriously affect the measurement results, or even make it impossible to measure data. Utility Model Content

[0004] In order to solve the defects of the prior art such as slow preheating of the optical gas cell and the influence of the fixing mode on the detection stability, the utility model proposes a temperature control device based on the optical gas cell to improve the preheating efficiency and temperature control accuracy and ensure the data monitoring accuracy.

[0005] The utility model is implemented by adopting the following technical scheme: a temperature control device based on an optical gas pool, comprising a thermal insulation cotton shell wrapped around the optical gas pool, a heat-conducting fin is further arranged inside the thermal insulation cotton shell, an air pipe outlet and an air pipe inlet are arranged at both ends of the thermal insulation cotton shell, a turbo fan is arranged inside the thermal insulation cotton shell on one side of the air pipe inlet, the air pipe inlet is connected with the heat-conducting fin, an air flow channel exists between the thermal insulation cotton shell and the optical gas pool, the thermal insulation cotton shell also plays a clamping and fixing role for the optical gas pool, a fan is arranged on an outer wall of one side of the thermal insulation cotton shell, the fan is connected to the heat-conducting fin through the cooling fin, the cooling block and the semiconductor refrigeration sheet in sequence, and in addition, a preheating chamber is also arranged inside the thermal insulation cotton shell, and the preheating chamber is connected with the air flow channel.

[0006] In addition, in combination with multi-point temperature measurement to achieve precise temperature control, this solution uses at least four temperature sensors to participate in the temperature control design. One temperature sensor is installed on the thermal fin, and the other three sensors are respectively attached to the front, middle and back positions of the optical gas cell. Through precise control of the semiconductor, the temperature of the optical gas cell can be kept constant.

[0007] During specific operation, external gas enters the insulation shell through the gas inlet, and is diffused with the assistance of the turbofan. The gas is then preheated by the heat-conducting fins and enters the preheating chamber. The temperature control effect is further ensured by preheating the gas. The preheated gas in the preheating chamber then enters the air flow channel, flows through the optical gas pool, and is finally discharged from the air pipe outlet. Combined with the design of the turbofan, the air flow inside the insulation cotton shell forms a circulation, and the temperature in the internal area of ​​the preheating chamber is quickly and evenly distributed, which accelerates the preheating time of the optical gas pool.

[0008] Compared with the prior art, the advantages and positive effects of the utility model are:

[0009] This solution wraps the optical gas cell with thermal insulation cotton to form an airflow channel between the two, and combines the design of a turbofan to circulate the airflow inside the thermal insulation cotton shell. This effectively solves the problems of slow preheating and poor thermal stability of traditional ordinary heating methods. The device has high temperature control accuracy and can be used to quickly and stably heat the optical gas cell. At the same time, the use of thermal insulation cotton to position the optical gas cell avoids stress deformation of the optical gas cell caused by the non-concentricity of the conventional tight fixing method, which affects the measurement results. This solution combines the ingenious design of the thermal insulation cotton shell to allow the hot air flow to circulate stably and achieve stable heating of the gas cell. The thermal insulation cotton has the functions of heat preservation, airflow guidance and gas cell fixation, which improves the measurement accuracy. The structural design is ingenious and has high practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the overall structure of the temperature control device of an embodiment of the utility model;

[0011] Figure 2 This is a schematic diagram of the exploded structure of the temperature control device of the utility model embodiment;

[0012] Figure 3 This is a schematic cross-sectional view of the temperature control device according to an embodiment of the utility model;

[0013] Among them: 1. first thermal insulation cotton; 2. second thermal insulation cotton; 3. third thermal insulation cotton; 4. heat-conducting fins; 5. optical cavity decay air pool; 51. air pool air inlet pipe; 6. turbo fan; 7. fan; 8. cooling fins; 9. cooling block; 10. semiconductor refrigeration sheet; 11. air pipe outlet; 12. air pipe inlet; 13. air flow channel; 14. preheating chamber. DETAILED DESCRIPTION

[0014] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. In the following description, many specific details are set forth to facilitate a full understanding of the utility model, but the utility model can also be implemented in other ways different from those described herein, and therefore, the utility model is not limited to the specific embodiments disclosed below.

[0015] This embodiment proposes a temperature control device based on an optical gas cell, and a cavity ring-down gas cell is taken as an example for detailed description. The cavity ring-down gas cell is made of glass or metal. Of course, this solution is also applicable to temperature control scenarios of optical gas cells of other types or materials such as infrared gas cells, ultraviolet gas cells or laser gas cells, and no excessive limitations are made here.

[0016] like Figure 1-3 As shown, it includes a thermal insulation cotton shell that wraps the optical cavity decay gas pool 5. The thermal insulation cotton is not easily deformed by heat and has good heat conduction effect. A heat conduction fin 4 is also arranged inside the thermal insulation cotton shell. An air pipe outlet 11 and an air pipe inlet 12 are arranged at both ends of the thermal insulation cotton shell. A turbo fan 6 is arranged inside the thermal insulation cotton shell on one side of the air pipe inlet 12. The air pipe inlet 12 is connected with the heat conduction fin 4. There is an air flow channel 13 between the thermal insulation cotton shell and the optical cavity decay gas pool. The thermal insulation cotton shell also clamps and fixes the optical cavity decay gas pool 5. A TEC semiconductor refrigeration sheet 10 is also arranged inside the thermal insulation cotton shell. The hot end of the TEC semiconductor refrigeration sheet 10 is connected to the heat conduction fin 4 inside the thermal insulation cotton shell, and its cold end is connected to the cooling fin 8 through the cooling block 9. A fan 7 is installed on the cooling fin 8, that is, the fan 7 arranged on the outer wall of the thermal insulation cotton shell is connected to the heat conduction fin 4 through the cooling fin 8, the cooling block 9 and the semiconductor refrigeration sheet 10 in sequence. In addition, a preheating chamber 14 is provided inside the thermal insulation cotton shell, and the preheating chamber 14 is connected to the air flow channel 13 .

[0017] During specific operation, external gas enters the heat preservation shell through the gas inlet 12, and is assisted in gas diffusion by the turbofan 6, and then is combined with the capillary copper tube with serpentine routing on the heat conduction fin 4 to realize serpentine winding, and then enters the preheating chamber 14, and the temperature control effect is further guaranteed by preheating the gas, and then the gas preheated by the preheating chamber 14 enters the air flow channel 13, and the air flow channel 13 surrounds the optical cavity ring-down gas pool 5 to form a heat preservation chamber, and the heated gas flows through the optical cavity ring-down gas pool 5, and is finally discharged from the air pipe outlet 11.

[0018] Continue to refer Figure 1 and Figure 2The thermal insulation cotton shell is in the form of a rectangular parallelepiped, including a first thermal insulation cotton 1, a second thermal insulation cotton 2 and a third thermal insulation cotton 3 arranged at both ends of the first thermal insulation cotton 1 and the second thermal insulation cotton 2. The thermal insulation cottons are connected and fixed by mutual plug-in assembly, which is similar to the plug-in method such as Luban lock. It is a relatively mature structural design and is not limited too much here. The material of the thermal insulation cotton can be selected according to actual conditions and is not limited too much here. The thermal insulation cotton can effectively reduce the use of inner and outer metal shells and the weight of the entire analyzer. In combination with the characteristics of the thermal insulation cotton, the optical cavity ring-down gas pool is clamped by the thermal insulation cotton to effectively ensure concentricity and play a role in heat preservation. In addition, in this embodiment, the turbo fan is arranged on one side of the trachea inlet 12, and the airflow is continuously circulated and heated along the air duct (such as Figure 2 The direction indicated by the middle arrow) makes the airflow inside the insulation cotton shell form a cycle to achieve stable heating, and makes the temperature of the internal area of ​​the preheating chamber 14 quickly and evenly distributed, accelerates the preheating of the optical cavity ring-down gas pool, shortens its heating time, and realizes that the constant temperature airflow can circulate quickly and evenly throughout the temperature control device, and keeps its temperature balanced and stable to the maximum extent. Under normal circumstances, the ambient temperature of the insulation chamber is stabilized at 40±0.01℃.

[0019] In addition, this embodiment can more accurately reflect the temperature of the entire optical cavity ring-down gas pool through multi-point temperature measurement; this embodiment uses at least four temperature sensors to participate in the temperature control design, one of which is installed on the heat-conducting fin, and the other three sensors are respectively attached to the front, middle and rear positions of the optical cavity ring-down gas pool, and the temperature of the optical cavity ring-down gas pool is kept constant through precise control of the semiconductor refrigeration sheet.

[0020] Combination Figure 3 As shown, in this embodiment, the thermal insulation cotton is designed with four clamping surfaces to clamp the optical cavity decay gas pool from the top, bottom, left and right. Of course, other forms of clamping or fixing methods can also be designed according to actual needs. The thermal insulation cotton has a certain elasticity and a certain hardness. In addition, the friction between the thermal insulation cotton and the gas pool is not small. In this way, the gas pool can be prevented from sliding after being fastened up and down. The reserved air flow channel is used to pass hot air to ensure that the gas pool can be completely preheated. The design of the thermal insulation cotton shell has the functions of fixing the gas pool and guiding the airflow. The structural design is novel, which can effectively ensure the temperature control effect and greatly improve the stability of the measurement data.

[0021] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A temperature control device based on an optical gas cell to achieve temperature control of the optical gas cell, characterized in that: It comprises a heat-insulating cotton shell that wraps the optical gas pool, a heat-conducting fin and a semiconductor cooling sheet are arranged inside the heat-insulating cotton shell, an air pipe outlet and an air pipe inlet are arranged on the heat-insulating cotton shell, and the air pipe inlet is connected with the heat-conducting fin; an air flow channel is formed between the heat-insulating cotton shell and the optical gas pool, and the heat-insulating cotton shell clamps and fixes the optical gas pool at the same time; The hot end of the semiconductor refrigeration plate is connected to the heat-conducting fin, and the cold end is connected to a cooling fin through a cooling block. The cooling fin is installed on the outer wall of the thermal insulation cotton shell, and a fan is installed on the cooling fin.

2. The temperature control device based on the optical gas cell according to claim 1, characterized in that: A turbo fan is arranged at the air pipe inlet side inside the thermal insulation cotton shell.

3. The temperature control device based on the optical gas cell according to claim 1, characterized in that: A preheating chamber is also provided inside the thermal insulation cotton shell, and the preheating chamber is connected with the air flow channel, and the air flow channel surrounds the air pool to form a thermal insulation chamber.

4. The temperature control device based on the optical gas cell according to claim 1, characterized in that: The thermal insulation cotton shell is a rectangular parallelepiped, including a first thermal insulation cotton, a second thermal insulation cotton and a third thermal insulation cotton arranged at both ends of the first thermal insulation cotton and the second thermal insulation cotton. The first thermal insulation cotton, the second thermal insulation cotton and the third thermal insulation cotton are connected and fixed by mutual plug-in assembly.

5. The temperature control device based on the optical gas cell according to claim 1, characterized in that: The temperature control device further comprises a plurality of temperature sensors, one of which is mounted on the heat-conducting fin, and the other plurality of temperature sensors are respectively arranged at different positions of the optical gas pool.

6. The temperature control device based on the optical gas cell according to claim 1, characterized in that: The heat conducting fins are provided with capillary copper tubes with serpentine routing.

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