Gas diffusion coefficient measuring device

Abstract

The application discloses a kind of gas diffusion coefficient detection devices, including the shell with opening, outer container bin and inner container bin being connected by horizontal conduit in shell and being communicated and the air extraction system being set in the cavity of shell;Wherein, gas pressure monitoring device is equipped in shell;The top of outer container bin is set to open, and temperature monitoring device is equipped in it;The top of inner container bin is equipped with the opening sealed with one-way water film;Movable paraffin small ball is arranged in horizontal conduit.The application improves the core detection component T-shaped pipe in the existing gas diffusion coefficient detection device to two container bins being respectively communicated with atmosphere and being set inside and outside by horizontal conduit by using communicating vessel principle, so that the volatilization of the liquid to be measured in outer container bin can be accurately characterized by the corresponding distance of paraffin small ball movement in horizontal conduit, which facilitates the acquisition of diffusion coefficient, and also significantly improves the measurement accuracy of the device.

Description

Technical Field

[0001] This invention relates to the field of gas detection technology, and in particular to a gas diffusion coefficient detection device. Background Technology

[0002] The diffusion coefficient is a physical quantity that represents the degree of gas diffusion and is a very important physical property indicator in industry. According to Fick's law, the diffusion coefficient is the mass or number of moles of a substance that diffuses perpendicularly through a unit area per unit time under the condition of a unit concentration gradient. Its magnitude mainly depends on the properties of the diffusing substance itself and the type, temperature, and pressure of the diffusion medium.

[0003] Existing gas diffusion coefficient detection devices generally use a T-tube as their core component. The horizontal tube within the T-tube is used to create airflow, ensuring a continuous and stable gas flow, while the vertical tube holds the volatile liquid being tested. Because changes in the liquid level in the vertical tube are difficult to observe during testing, magnifying glasses and other observation instruments are needed to determine the liquid level drop during data reading. This not only inconveniences the testing process but also easily leads to reduced accuracy of the test results.

[0004] In addition, the lack of an intelligent control system in existing gas diffusion coefficient detection devices results in low stability in monitoring control variables such as temperature and gas flow rate during the test process. This also makes the operation of existing devices cumbersome, time-consuming, and labor-intensive, while the accuracy is not high.

[0005] Therefore, it is necessary to design an improved gas diffusion coefficient detection device to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a novel intelligent gas diffusion coefficient detection device with higher testing accuracy and simple operation, thereby solving the problems of insufficient measurement accuracy and low testing efficiency caused by inconvenient data reading, low device stability, and inconvenient operation in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A gas diffusion coefficient detection device includes a housing with an opening, an outer container chamber and an inner container chamber disposed inside the housing and interconnected by a horizontal conduit, and an air extraction system disposed in the inner cavity of the housing.

[0009] The housing is equipped with a pressure monitoring device;

[0010] The top of the outer container is open, and a temperature monitoring device is installed inside.

[0011] The top of the inner container chamber is provided with an opening sealed with a one-way water-directing film;

[0012] The horizontal conduit contains movable paraffin beads.

[0013] As a further improvement of the present invention, a constant temperature heating plate is provided at the bottom of the outer container compartment.

[0014] As a further improvement of the present invention, the horizontal conduit is provided with a plurality of photoelectric sensors along the extension direction of the horizontal conduit, and the photoelectric sensors are connected to a microcontroller disposed in the housing.

[0015] As a further improvement of the present invention, a temperature sensor is provided inside the outer container chamber;

[0016] A pressure sensor is installed inside the housing;

[0017] The constant temperature heating plate, the temperature sensor, the air pressure sensor, and the air extraction system are all connected to a microcontroller located inside the housing.

[0018] As a further improvement of the present invention, a touch screen connected to the microcontroller is provided on the outer wall of the housing.

[0019] As a further improvement of the present invention, the opening of the housing is located at the top of the housing;

[0020] The air extraction system is located at the bottom of the housing;

[0021] The size of the top opening of the outer container is larger than the size of the top opening of the shell, which is larger than the size of the top opening of the inner container.

[0022] As a further improvement of the present invention, a waterproof baffle is provided at the connection between the air extraction system and the inner cavity of the housing;

[0023] The microcontroller and power supply are located below the waterproof baffle.

[0024] As a further improvement of the present invention, the shell, the outer container, and the inner container are all cylindrical.

[0025] As a further improvement of the present invention, the ratio of the inner diameter of the outer container chamber, the inner diameter of the inner container chamber, and the inner diameter of the horizontal conduit is 60:40:1.

[0026] As a further improvement of the present invention, the bottom of the housing is provided with an adjustable support mechanism;

[0027] The adjustable support mechanism includes a nut column connected to the bottom of the housing and a support leg connected to the bottom end of the nut column.

[0028] The technical effects and advantages of this invention are as follows:

[0029] This invention discloses a gas diffusion coefficient detection device, comprising a shell with an opening, an outer container chamber and an inner container chamber connected within the shell by a horizontal conduit, and a suction system connected to the inner cavity of the shell. The shell contains a pressure monitoring device; the top of the outer container chamber is open, and a temperature monitoring device is located inside; the top of the inner container chamber has an opening sealed by a one-way water-guided film; and a movable paraffin ball is disposed within the horizontal conduit. By utilizing the principle of communicating vessels, this invention improves the core detection component, the T-shaped tube, in existing gas diffusion coefficient detection devices by replacing it with two container chambers connected by a horizontal conduit, each communicating with the atmosphere and arranged as an inner and outer shell. This allows the evaporation of the liquid being tested within the outer container chamber to be accurately characterized by the distance the paraffin ball moves within the horizontal conduit, facilitating the acquisition of the moving distance and significantly improving the measurement accuracy of the device.

[0030] This invention improves the intelligence and operability of a gas diffusion coefficient detection device by introducing a microcontroller into the device and connecting the microcontroller to the pumping system, constant temperature heating plate, photoelectric sensor, air pressure monitoring device, and temperature monitoring device within the device. This simplifies the control process, ensures stable control of external variable factors such as temperature, pressure, and gas flow during the test, and further ensures the measurement effect of the device.

[0031] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the gas diffusion coefficient detection device of the present invention;

[0033] Figure 2 This is a schematic cross-sectional view of the gas diffusion coefficient detection device of the present invention;

[0034] Figure 3 This is a schematic diagram of the airflow movement path during the use of the gas diffusion coefficient detection device of the present invention.

[0035] Figure 4 This is a schematic diagram of the intelligent control principle of the gas diffusion coefficient detection device of the present invention.

[0036] Figure Labels

[0037] 1. Housing; 2. One-way water-guided membrane; 3. Touch screen; 4. Outer container chamber; 5. Constant temperature heating plate; 6. Horizontal conduit; 7. Waterproof baffle; 8. Power supply; 9. Inner container chamber; 10. Temperature sensor; 11. Paraffin wax beads; 12. Pressure sensor; 13. Photoelectric sensor; 14. Microcontroller; 15. Air extraction system; 16. Nut column; 17. Support leg. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] To address the shortcomings of existing technologies, this invention discloses a gas diffusion coefficient detection device. Please refer to [link / reference]. Figure 2As shown, the device includes a shell 1 with an opening, an outer container 4 and an inner container 9 connected to each other within the shell 1 via a horizontal conduit 6, and an air extraction system 15 connected to the inner cavity of the shell 1. The shell 1 contains a pressure monitoring device; the top of the outer container 4 is open, and a temperature monitoring device is located inside; the top of the inner container 9 has an opening sealed by a one-way water-conducting film 2; and a movable paraffin ball 11 is disposed within the horizontal conduit 6. With this configuration, the present invention can accurately characterize the evaporation of the liquid to be tested in the outer container 4 by measuring the distance the paraffin ball 11 moves towards the inner container 9 via the horizontal conduit 6, thus solving the problem of difficulty in reading the liquid level drop during previous tests and improving the testing accuracy of this device. Specifically, during the continuous evacuation of air from the shell 1 by the evacuation system 15, the liquid to be tested in the open outer container 4 will continuously evaporate. At the same time, since the top opening of the inner container 9 is sealed with a one-way water-conducting film 2, the liquid inside will condense and flow back into the inner container 9 after evaporating to the one-way water-conducting film 2. Therefore, the liquid volume in the inner container 9 will remain unchanged. At this time, since both the outer container 4 and the inner container 9 can be connected to the atmosphere, according to the principle of communicating vessels, the liquid in the inner container 9 will continuously flow into the outer container 4 through the horizontal conduit 6. This causes the paraffin beads 11 set in the horizontal conduit 6 to continuously move in the direction of connection with the outer container 4. By simply obtaining the movement of the beads in the tube, it can be calculated and converted into a reflection of the evaporation of the liquid to be tested in the outer container 4. Thus, the gas diffusion coefficient of the liquid to be tested can be accurately obtained in a simpler, more convenient and more accurate way.

[0040] Furthermore, by setting a constant-temperature heating plate 5 at the bottom of the outer container chamber 4, the evaporation and diffusion of the liquid to be tested in the outer container chamber 4 can be further accelerated, thereby testing the gas diffusion coefficient of the liquid to be tested at different temperatures.

[0041] Specifically, the shell 1, outer container 4, and inner container 9 in this invention are preferably cylindrical. This not only reduces the footprint and increases utilization, but also better ensures the stability of temperature and airflow control within the device. Furthermore, simulations using an outer container 4 with an inner diameter of 1200mm, an inner container 9 with an inner diameter of 800mm, and a horizontal glass conduit with an inner diameter of 20mm revealed that the measurement accuracy of this testing device can reach 2*10⁻⁶. -3 mm, this accuracy is at an industry-leading level under the same cost conditions.

[0042] Furthermore, in the embodiment provided by the present invention, the opening on the housing 1 is located at the top of the housing 1, and correspondingly, the air extraction system 15 is adapted to be located at the bottom of the housing 1. In this configuration, the size of the top opening of the outer container 4 must be larger than the size of the top opening of the housing 1; simultaneously, the size of the top opening of the housing 1 must be larger than the size of the top opening of the inner container 9. With this configuration, the airflow trajectory inside the detection device when it is in operation can be seen... Figure 3 As shown, air enters through the opening at the top of the housing 1, forming a circulation around the outer container 4. During this circulation, the gas to be tested, which is continuously evaporated from the outer container 4, is carried away. A pressure sensor installed inside the housing 1 monitors the pressure formed inside the housing 1 in real time to ensure stable airflow. Furthermore, the size of the opening at the top of the housing 1 is set larger than the size of the opening at the top of the inner container 9, ensuring that the airflow into the housing 1 from the top does not affect the pressure inside the inner container 9, thus maintaining a constant pressure and not affecting the strength of the communicating vessel. However, those skilled in the art will readily realize that appropriately changing the position of the opening at the housing 1, such as placing it on one side wall of the housing 1, and correspondingly adapting the suction system 15 to the opposite side wall, will not affect the suction principle of this design and can still achieve the gas diffusion acceleration effect claimed in this invention. Therefore, without departing from the inventive concept, simple adjustments to the orientation of the openings at the housing 1, inner, and outer container 9 should fall within the protection scope of this invention.

[0043] Furthermore, a waterproof baffle 7 is provided at the connection between the air extraction system 15 and the inner cavity of the housing 1; the microcontroller 14 and the power supply 8 are both located below the waterproof baffle 7 to effectively prevent short circuits that may occur after water enters the aforementioned electrical equipment.

[0044] Meanwhile, to further simplify the aforementioned testing process, this design incorporates multiple photoelectric sensors 13 arranged side-by-side along the extension direction of the horizontal conduit 6 to monitor the movement distance of the paraffin balls 11 within the conduit in real time. Additionally, a temperature sensor 10 is installed inside the outer container chamber 4, and a pressure sensor 12 is installed inside the housing 1. The photoelectric sensors 13, the constant-temperature heating plate 5, the temperature sensor 10, the pressure sensor 12, and the extraction system 15 are all connected to a microcontroller 14 located within the housing 1. By introducing a microcontroller into the gas diffusion coefficient detection device, not only is the intelligent control level of the device improved and the control process simplified, but it also ensures stable monitoring and real-time data acquisition of external variable factors such as temperature, pressure, and gas flow rate throughout the testing process. This further ensures the measurement effect of the device and improves the testing efficiency of the gas diffusion coefficient.

[0045] Furthermore, a touchscreen 3, which is connected to the microcontroller 14 via signal transmission, is provided on the outer wall of the housing 1. See details in [link to relevant documentation]. Figure 1 and combined Figure 4 As shown, the intelligent control part of this device can be implemented using an STM32 microcontroller. Before measurement begins, the temperature is first heated to the set temperature by the temperature sensor 10 and the constant temperature heating plate 5, and the initial atmospheric pressure is measured by the air pressure sensor 12. When measurement begins, the suction system 15 operates, and the paraffin ball 11 begins to move towards the connection direction of the outer container chamber 4. During this process, it will pass through multiple photoelectric sensors 13 in sequence. The STM32 microcontroller records the time required for it to pass through each photoelectric sensor 13, and the diffusion coefficient can be automatically calculated by the calculation module according to the following formula and displayed on the OLED touch screen. Specifically, when using the device, the user inputs the predetermined temperature and gas flow rate (suction system power) through the touch screen 3. This signal is transmitted to the microcontroller 14, which drives the constant temperature heating plate 5 and the suction system 15 to achieve a constant temperature and constant flow environment during the test until the gas diffusion coefficient is read. This makes the device simple to operate and saves time and effort.

[0046]

[0047] In the formula, Among them, Z i t represents the distance between each photoelectric sensor and the first photoelectric sensor. i K represents the time interval between the paraffin spheres traveling from the first photoelectric sensor to each subsequent photoelectric sensor; (to further improve calculation accuracy, the value of K can be calculated multiple times and then averaged); D A ρ is the diffusion coefficient of gas A; A Let R be the density of gas A; R be the molar gas constant, taken as 8.314; T be the set constant temperature; M be the density of gas A. A ----Relative molar mass of gas A; P is the atmospheric pressure during the experiment, i.e., the pressure measured by the pressure gauge before the experiment was started; P 测 The pressure measured by the pressure gauge during the experiment; r 管 R is the radius of the horizontal catheter; 外 R is the radius of the outer container. 内 The radius of the inner container chamber.

[0048] Furthermore, adjustable support mechanisms are provided around the bottom of the device housing 1. These adjustable support mechanisms include a nut column 16 connected to the bottom of the housing 1 and a support leg 17 connected to the bottom end of the nut column 16. The support leg 17 allows for height adjustment of the device body by rotating the nut column 16. This arrangement, by adjusting the height of the support mechanisms located at the four corners of the device body's bottom, further ensures that the horizontal conduit 6 remains horizontal during gas diffusion coefficient testing, guaranteeing that the measured values ​​are not affected and further improving the accuracy of the measurement results.

[0049] The following is a detailed description of how to use the gas diffusion coefficient detection device of the present invention:

[0050] Inject the liquid to be tested into the two containers, turn on the instrument by operating the touch screen 3, and set the heating temperature and airflow pressure. At this time, the air pressure sensor 12 measures the atmospheric pressure P. Then, the device is gradually heated to the set temperature under the monitoring of the temperature sensor 10. At this time, the photoelectric sensor 13 is turned on for preparation.

[0051] When the measurement begins, the dehumidification system 15 starts working, and the air pressure sensor 12 measures the airflow pressure P at this time. 测 As the gas in the outer container 4 is gradually extracted, the liquid in the outer container 4 gradually decreases. Due to the influence of the communicating vessels, the liquid in the inner container 9 gradually flows to the outer container, thereby driving the paraffin ball 11 in the horizontal conduit 6 to move towards the connecting side of the outer container 4. During the movement of the paraffin ball 11, it will reach each photoelectric sensor 13. The microcontroller 14 simultaneously records the time required for the paraffin ball 11 to pass through each photoelectric sensor 13, and automatically calculates the gas diffusion coefficient using the above formula, then displays it directly on the screen.

[0052] In summary, this invention utilizes the principle of communicating vessels to improve the core detection component, the T-shaped tube, in existing gas diffusion coefficient detection devices by replacing it with two interconnected, inner and outer container chambers connected by a horizontal conduit. This allows for precise characterization of the evaporation of the liquid in the outer container chamber by measuring the distance a paraffin ball moves within the horizontal conduit. This simplifies distance acquisition and significantly improves the device's measurement accuracy. Furthermore, by introducing a microcontroller into the gas diffusion coefficient detection device and connecting it to the pumping system, constant temperature heating plate, photoelectric sensor, pressure monitoring device, and temperature monitoring device, the device's intelligence is enhanced, its operability improved, and the control process simplified. This ensures stable control of external variable factors such as temperature, pressure, and gas flow during testing, further guaranteeing the device's measurement effectiveness.

[0053] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gas diffusion coefficient detection device, comprising a shell (1) provided with an opening, an outer container bin (4) and an inner container bin (9) disposed in the shell (1) and connected to each other through a horizontal conduit (6), and a gas extraction system (15) disposed in the inner cavity of the shell (1); The shell (1) is provided with a gas pressure monitoring device; The top of the outer container bin (4) is provided with an opening, and the inside is provided with a temperature monitoring device; The top of the inner container bin (9) is provided with an opening sealed by a one-way water guide film (2); The horizontal conduit (6) is provided with movable paraffin balls (11); The bottom of the outer container bin (4) is provided with a constant temperature heating plate (5); Wherein, The opening of the shell (1) is provided at the top of the shell (1); The gas extraction system (15) is provided at the bottom of the shell (1); The size of the opening at the top of the outer container bin (4) is greater than the size of the opening at the top of the shell (1), which is greater than the size of the opening at the top of the inner container bin (9); Wherein, The horizontal conduit (6) is provided with a plurality of photoelectric sensors (13) along the extension direction of the horizontal conduit (6), and the photoelectric sensors (13) are signal connected with a single-chip microcomputer (14) disposed in the shell (1); The shell (1), the outer container bin (4) and the inner container bin (9) are all provided in a cylindrical shape; The ratio of the inner diameter of the outer container bin (4), the inner diameter of the inner container bin (9) and the inner diameter of the horizontal conduit (6) is 60:40:

1.

2. The gas diffusion coefficient detection device according to claim 1, wherein, The outer container bin (4) is provided with a temperature sensor (10); The shell (1) is provided with a gas pressure sensor (12); The constant temperature heating plate (5), the temperature sensor (10), the gas pressure sensor (12) and the gas extraction system (15) are all signal connected with the single-chip microcomputer (14) disposed in the shell (1).

3. The gas diffusion coefficient detection device according to claim 2, wherein, The outer wall of the shell (1) is provided with a touch screen (3) signal connected with the single-chip microcomputer (14).

4. The gas diffusion coefficient detection device according to claim 3, wherein, The gas extraction system (15) is provided with a waterproof baffle (7) at the connection with the inner cavity of the shell (1); The single-chip microcomputer (14) and a power supply (8) are disposed below the waterproof baffle (7).

5. The gas diffusion coefficient detection device according to claim 1, wherein, The bottom of the shell (1) is provided with an adjustable support mechanism; The adjustable support mechanism comprises a nut column (16) connected to the bottom of the shell (1) and a support leg (17) connected to the bottom end of the nut column (16).

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