Fixed online refractometer calibration device

Abstract

The utility model discloses a fixed online refractometer calibration device which comprises a plurality of liquid storage bottles, a constant-temperature liquid storage tank, a refractometer calibration structure and a circulating pipeline, the liquid storage bottles are used for containing different liquid media. The constant-temperature liquid storage tank is respectively connected with the plurality of liquid storage bottles; two ends of the circulating pipeline are respectively communicated with the constant-temperature liquid storage tank; the refractometer calibration structure is arranged on the circulating pipeline and comprises a reference refractometer, a calibrated refractometer and a temperature sensor. According to the fixed online refractometer calibration device, dynamic calibration can be implemented under the conditions of specific refractive index or concentration and specified temperature, and data deviation caused by factors such as temperature and flow of a liquid medium in offline static calibration is avoided; the device is suitable for detachable online refractometers or online refractometers which have high requirements on measurement accuracy and can be used as reference instruments, and is reasonable in design and high in operability.

Description

Technical Field

[0001] This utility model relates to the fields of metrology and calibration, and instrumentation process verification, and in particular to a fixed online refractometer calibration device. Background Technology

[0002] Refractive index (also known as refractive index) is a specific inherent property of a substance, changing with temperature and wavelength. For pure substances, refractive index can be used to identify and distinguish samples; for binary mixtures (such as solute dissolved in solvent), it can be used to measure concentration (common examples include Brix degree, which characterizes the concentration of sucrose solution, and salinity, which characterizes the concentration of sodium chloride solution); for binary or multi-component mixtures with known composition ratios, quality control can also be performed by monitoring refractive index. Online refractive index technology is a type of process analysis technique. Its basic application lies in using the data stream provided by an online refractometer to determine relative trends and monitor processes in real time. Based on this, combined with other data streams such as process variables and reference data from analytical laboratories, comprehensive data analysis can be performed to achieve real-time monitoring of key product quality attributes and correlation with key process parameters, ultimately enabling real-time release of product indicators. This helps improve product quality, reduce production costs, increase production efficiency, reduce laboratory testing needs, and identify opportunities for process improvement, ultimately reducing product production risks and costs. The online refractometer is the core of online refraction technology. Its performance and the accuracy of its measurements are related to the effectiveness of the subsequent data stream, which in turn affects product manufacturing.

[0003] Unlike laboratory refractometers, online refractometers are installed "in-line," "online," or "near-line." Sample collection and analysis are completed "in-situ" or "near in-situ." The actual measurement results often differ significantly from those of laboratory refractometers under reference conditions. This means that the "reference data" measured by laboratory refractometers is not applicable to samples under actual working conditions, thus affecting the actual effectiveness of online refractometer technology.

[0004] Therefore, a fixed online refractometer calibration device is needed to solve the above problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A fixed online refractometer calibration device includes several liquid storage bottles, a constant temperature liquid storage tank, a refractometer calibration structure, and a circulation pipeline; the several liquid storage bottles are used to hold different liquid media; the constant temperature liquid storage tank is connected to the several liquid storage bottles respectively; both ends of the circulation pipeline are connected to the constant temperature liquid storage tank respectively; the refractometer calibration structure is set on the circulation pipeline and includes a refractometer to be calibrated.

[0007] Preferably, the refractometer calibration structure further includes a first reference refractometer, a second reference refractometer, and two first temperature sensors. The first reference refractometer and the second reference refractometer are respectively disposed on both sides of the refractometer to be calibrated and connected to the refractometer to be calibrated. The two first temperature sensors are respectively disposed at the inlet end of the first reference refractometer and the outlet end of the second reference refractometer.

[0008] Preferably, the fixed online refractometer calibration device further includes a vacuum degassing tank, which is disposed between the constant temperature storage tank and the second reference refractometer. The vacuum degassing tank is connected to the constant temperature storage tank, the second reference refractometer is connected to the vacuum degassing tank, and the first reference refractometer is connected to the constant temperature storage tank.

[0009] Preferably, each liquid storage bottle also includes a peristaltic pump. The input end of the peristaltic pump is connected to the inside of the corresponding liquid storage bottle through a pipe, and the output end of the peristaltic pump is connected to the input end of a switching valve through a pipe. The output end of the switching valve is connected to a constant temperature liquid storage tank. The liquid storage bottle contains the corresponding liquid medium, and the required liquid medium is transferred to the constant temperature liquid storage tank through the peristaltic pump and the switching valve.

[0010] Preferably, the switching valve is a multi-channel switching valve.

[0011] Preferably, a pressure sensor and a degassing pump are installed on the vacuum degassing tank, and both the pressure sensor and the degassing pump are connected to the vacuum degassing tank; the degassing pump is used to remove dissolved gases from the liquid in the vacuum degassing tank, and the pressure sensor is used to monitor the pressure in the vacuum degassing tank.

[0012] Preferably, the circulation pipeline is also equipped with a first electric valve, a filter, a gear pump, and a gear flow meter. The first electric valve is connected to the constant temperature storage tank and the filter, the gear pump is connected to the filter and the gear flow meter, and the gear flow meter is connected to the first reference refractometer.

[0013] Preferably, the fixed online refractometer calibration device further includes a second pipeline, which is connected to the circulation pipeline, with the connection point located between the first electric valve and the constant temperature storage tank; the second pipeline contains two recovery pipelines, which are respectively connected to the inorganic waste liquid tank and the organic waste liquid tank, and each recovery pipeline is equipped with a second electric valve; a sampling port is provided at the end of the second pipeline.

[0014] Preferably, the constant temperature liquid storage tank is equipped with a second pressure sensor and a second temperature sensor. The second pressure sensor is used to detect the pressure inside the constant temperature liquid storage tank, and the second temperature sensor is used to detect the temperature of the liquid medium inside the constant temperature liquid storage tank.

[0015] Preferably, a semiconductor temperature controller and a third temperature sensor are installed on the outside of the constant temperature storage tank. The semiconductor temperature controller is used to control the temperature of the liquid in the constant temperature storage tank, and the third temperature sensor is used to detect the temperature of the semiconductor temperature controller.

[0016] Preferably, the circulation pipe is also equipped with an insulation sleeve, which is located outside the circulation pipe and is in circulation with the constant temperature water bath. The temperature of the liquid medium flowing through the circulation pipe is maintained by adjusting the temperature of the external circulating water bath of the constant temperature water bath.

[0017] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0018] 1. By adjusting the peristaltic pump, switching valve, first electric valve, and second electric valve, different liquid media can be selected to calibrate the refractometer under test, or different cleaning media can be selected to clean the pipeline. Finally, depending on the properties of the liquid media in the pipeline, it is transferred to an inorganic waste liquid tank or an organic waste liquid tank. The device is reasonably designed and highly operable.

[0019] Second, this fixed online refractometer calibration device is designed with a temperature control function. By circulating a liquid medium at a specific temperature in the pipeline, dynamic calibration of the refractometer under specific refractive index or concentration and specified temperature conditions can be achieved, avoiding data deviation caused by factors such as the temperature and flow of the liquid medium in offline static calibration.

[0020] III. Depending on the refractometer being calibrated, this fixed online refractometer calibration device can be divided into two different calibration methods: Calibration Method 1: The calibration device does not install a reference refractometer. The refractive index or concentration value of a homogeneous liquid with known specific refractive index or concentration is used as the standard value to calibrate the refractive index or concentration indication error of the instrument. This method is suitable for detachable online refractometers or those requiring high measurement accuracy and which can be used as reference instruments. Calibration Method 2: The calibration device installs a reference refractometer. The refractive index or concentration measurement value of the reference refractometer is used as the standard value to calibrate the refractive index or concentration indication error of the instrument. This method is suitable for detachable online refractometers or those requiring low measurement accuracy and which are not used as reference instruments. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of calibration method 1 of the fixed online refractometer calibration device of this utility model;

[0023] Figure 2This is a schematic diagram of calibration method 2 of the fixed online refractometer calibration device of this utility model.

[0024] Key component symbols: 1. Storage bottle; 2. Peristaltic pump; 3. Switching valve; 4. Thermostatic storage tank; 8. Inorganic waste liquid tank; 9. Organic waste liquid tank; 10. Sampling port; 11. First electric valve; 12. Filter; 13. Gear pump; 14. Gear flow meter; 15. First reference refractometer; 16. Refractometer under calibration; 17. Second reference refractometer; 18. First temperature sensor; 20. Vacuum degassing tank; 21. Pressure sensor; 22. Degassing pump; 23. Circulation pipeline; 24. Thermostatic water bath; 30. Second pipeline; 301. Recovery pipeline; 302. Second electric valve; 41. Second pressure sensor; 42. Second temperature sensor; 43. Semiconductor temperature controller; 44. Third temperature sensor; 230. Insulation sleeve.

[0025] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the present invention. The terms "first," "second," etc., in the specification, claims, and accompanying drawings of the present invention are used to distinguish different objects and not to describe a particular order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to imply non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] Please see Figures 1-2This utility model provides a fixed online refractometer calibration device, including a plurality of liquid storage bottles 1, a constant temperature liquid storage tank 4, a refractometer calibration structure and a circulation pipe 23; the plurality of liquid storage bottles 1 are used to hold different liquid media; the constant temperature liquid storage tank 4 is connected to the plurality of liquid storage bottles 1 respectively; the two ends of the circulation pipe 23 are respectively connected to the constant temperature liquid storage tank 4; the refractometer calibration structure is set on the circulation pipe 23 and includes a refractometer 16 to be calibrated.

[0029] In one embodiment of the present invention, the refractometer calibration structure further includes a first reference refractometer 15, a second reference refractometer 17, and two first temperature sensors 18. The first reference refractometer 15 and the second reference refractometer 17 are respectively disposed on both sides of the refractometer 16 to be calibrated and connected to the refractometer 16 to be calibrated. The two first temperature sensors 18 are respectively disposed at the inlet end of the first reference refractometer 15 and the outlet end of the second reference refractometer 17.

[0030] In one embodiment of the present invention, the fixed online refractometer calibration device further includes a vacuum degassing tank 20, which is disposed between the constant temperature storage tank 4 and the second reference refractometer 17. The vacuum degassing tank 20 is connected to the constant temperature storage tank 4, the second reference refractometer 17 is connected to the vacuum degassing tank 20, and the first reference refractometer 15 is connected to the constant temperature storage tank 4.

[0031] In one embodiment of this utility model, each liquid storage bottle 1 further includes a peristaltic pump 2. The input end of the peristaltic pump 2 is connected to the interior of the corresponding liquid storage bottle 1 through a pipe, and the output end of the peristaltic pump 2 is connected to the input end of the switching valve 3 through a pipe. The output end of the switching valve 3 is connected to the constant temperature liquid storage tank 4. The liquid storage bottle 1 contains the corresponding liquid medium, and the required liquid medium is transferred to the constant temperature liquid storage tank 4 through the peristaltic pump 2 and the switching valve 3.

[0032] In one embodiment of this utility model, the switching valve 3 is a multi-channel switching valve.

[0033] In one embodiment of the present invention, a pressure sensor 21 and a degassing pump 22 are installed on the vacuum degassing tank 20. Both the pressure sensor 21 and the degassing pump 22 are connected to the vacuum degassing tank 20. The degassing pump is used to remove dissolved gases from the liquid in the vacuum degassing tank 20, and the pressure sensor 21 is used to monitor the pressure in the vacuum degassing tank 20.

[0034] In one embodiment of this utility model, the circulation pipeline 23 is further provided with a first electric valve 11, a filter 12, a gear pump 13, and a gear flow meter 14. The first electric valve 11 is connected to the constant temperature storage tank 4 and the filter 12 respectively. The gear pump 13 is connected to the filter 12 and the gear flow meter 14 respectively. The gear flow meter 14 is connected to the first reference refractometer 15.

[0035] Furthermore, the fixed online refractometer calibration device also includes a second pipe 30, which is connected to the circulation pipe 23. The connection point is located between the first electric valve 11 and the constant temperature storage tank 4. The second pipe 30 contains two recovery pipes 301, which are respectively connected to the inorganic waste liquid tank 8 and the organic waste liquid tank 9. Each recovery pipe 301 is equipped with a second electric valve 302. A sampling port 10 is provided at the end of the second pipe.

[0036] In one embodiment of the present invention, a second pressure sensor 41 and a second temperature sensor 42 are provided on the constant temperature liquid storage tank 4. The second pressure sensor 41 is used to detect the pressure inside the constant temperature liquid storage tank 4, and the second temperature sensor 42 is used to detect the temperature of the liquid medium inside the constant temperature liquid storage tank 4.

[0037] In one embodiment of this utility model, a semiconductor temperature controller 43 and a third temperature sensor 44 are provided on the outside of the constant temperature storage tank 4. The semiconductor temperature controller 43 is used to control the temperature of the liquid inside the constant temperature storage tank 4, and the third temperature sensor 44 is used to detect the temperature of the semiconductor temperature controller 43. The semiconductor temperature controller 43 can adjust and maintain the temperature of the liquid medium inside the constant temperature storage tank 4.

[0038] In one embodiment of the present invention, a heat-insulating sleeve 230 is also provided on the circulation pipe 23. The heat-insulating sleeve 230 is located outside the circulation pipe 23, and the inside of the sleeve is in circulation communication with the constant temperature water bath 24. The temperature of the liquid medium flowing through the circulation pipe 23 is maintained by adjusting the temperature of the external circulating water bath of the constant temperature water bath 24.

[0039] The usage process of this utility model:

[0040] Please see Figure 1Calibration Method 1 (No reference refractometer installed on the calibration device): Add a homogeneous liquid with a known specific refractive index or concentration to the storage bottle 1. Transfer the required liquid to the constant temperature storage tank 4 using the peristaltic pump 2 and the switching valve 3. After completion, switch the switching valve 3 to the stop position. Sequentially start the semiconductor temperature controller 43 and the constant temperature water bath 24, set the required temperature, and turn on the gear pump 13 and the degassing pump 22 to circulate the liquid medium in the circulation pipe 23. Once the temperature reaches the required level, the temperature readings of the two first temperature sensors 18 are compared. Once the calibration requirements are met and the reading of the refractometer 16 under calibration stabilizes, the refractive index or concentration reading and temperature reading of the refractometer 16 under calibration are read respectively. The refractive index or concentration of a known specific liquid is used as the standard value for refractive index or concentration, and the average temperature reading of the two first temperature sensors 18 is used as the standard temperature value. The difference between the reading of the refractometer 16 under calibration and the standard value is used as the indication error of the refractometer 16 under calibration. Thus, the refractive index or concentration indication error and temperature indication error of the refractometer 16 under calibration are obtained respectively. By adjusting the peristaltic pump 2, switching valve 3, first electric valve 11, and second electric valve 302, different homogeneous liquids with known specific refractive indices or concentrations and stable properties can be used to calibrate the refractometer 16, or different cleaning media can be selected to clean the pipeline. Finally, depending on the properties of the liquid medium in the pipeline, it is transferred to the inorganic waste liquid tank 8 or the organic waste liquid tank 9. Under this calibration method, the main flow direction of the liquid is as follows: storage bottle 1 → peristaltic pump 2 → switching valve 3 → constant temperature storage tank 4 → first electric valve 11 → filter 12 → gear pump 13 → gear flow meter 14 → refractometer under calibration 16 → vacuum degassing tank 20 → constant temperature storage tank 4.

[0041] Please see Figure 2Calibration Method 2 (Calibration Device with Reference Refractometer): Add a stable liquid with uniform refractive index or concentration to the storage bottle 1. Transfer the required liquid to the constant temperature storage tank 4 using the peristaltic pump 2 and switching valve 3. After completion, switch valve 3 to the stop position. Sequentially start the semiconductor temperature controller 43 and the constant temperature water bath 24, set the required temperature, and turn on the gear pump 13 and degassing pump 22 to circulate the liquid medium in the circulation pipe 23. Wait until the temperature reaches the required level, and the temperature difference between the two first temperature sensors 18 meets the calibration requirements. Also, the first reference refractometer 15 and the second reference refractometer 18... After the readings of instrument 17 and the refractometer 16 under calibration stabilize, the refractive index or concentration readings and temperature readings of the first reference refractometer 15, the second reference refractometer 17, and the refractometer 16 under calibration are recorded respectively. The average refractive index or concentration reading of the first reference refractometer 15 and the second reference refractometer 17 is taken as the standard refractive index value, and the average temperature reading of the two first temperature sensors 18 is taken as the standard temperature value. The difference between the reading of the refractometer 16 under calibration and the standard value is taken as the reading error of the refractometer 16 under calibration. The refractive index or concentration reading error and the temperature reading error of the refractometer 16 under calibration are obtained respectively. By adjusting the peristaltic pump 2, the switching valve 3, the first electric valve 11, and the second electric valve 302, different refractive index or concentration homogeneous liquids are selected to calibrate the refractometer 16 under calibration, or different cleaning media are selected to clean the pipeline. Finally, according to the properties of the liquid medium in the pipeline, it is transferred to the inorganic waste liquid tank 8 or the organic waste liquid tank 9. Under this calibration method, the main flow direction of the liquid is as follows: storage bottle 1 → peristaltic pump 2 → switching valve 3 → constant temperature storage tank 4 → first electric valve 11 → filter 12 → gear pump 13 → gear flow meter 14 → first reference refractometer 15 → refractometer under calibration 16 → second reference refractometer 17 → vacuum degassing tank 20 → constant temperature storage tank 4.

[0042] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A fixed online refractometer calibration device, characterized in that: It includes several liquid storage bottles (1), a constant temperature liquid storage tank (4), a refractometer calibration structure and a circulation pipeline (23); several liquid storage bottles (1) are used to hold different liquid media; the constant temperature liquid storage tank (4) is connected to several liquid storage bottles (1) respectively; both ends of the circulation pipeline (23) are connected to the constant temperature liquid storage tank (4); the refractometer calibration structure is set on the circulation pipeline (23) and includes a refractometer (16) to be calibrated.

2. The fixed online refractometer calibration device as described in claim 1, characterized in that: The refractometer calibration structure also includes a first reference refractometer (15), a second reference refractometer (17), and two first temperature sensors (18). The first reference refractometer (15) and the second reference refractometer (17) are respectively located on both sides of the refractometer (16) to be calibrated and connected to the refractometer (16) to be calibrated. The two first temperature sensors (18) are respectively located at the inlet end of the first reference refractometer (15) and the outlet end of the second reference refractometer (17).

3. The fixed online refractometer calibration device as described in claim 1, characterized in that: The fixed online refractometer calibration device also includes a vacuum degassing tank (20), which is located between the constant temperature storage tank (4) and the second reference refractometer (17). The vacuum degassing tank (20) is connected to the constant temperature storage tank (4), the second reference refractometer (17) is connected to the vacuum degassing tank (20), and the first reference refractometer (15) is connected to the constant temperature storage tank (4).

4. The fixed online refractometer calibration device as described in claim 1, characterized in that: Each liquid storage bottle (1) also includes a peristaltic pump (2). The input end of the peristaltic pump (2) is connected to the inside of the corresponding liquid storage bottle (1) through a pipe. The output end of the peristaltic pump (2) is connected to the input end of the switching valve (3) through a pipe. The output end of the switching valve (3) is connected to the constant temperature liquid storage tank (4). The liquid storage bottle (1) contains the corresponding liquid medium. The required liquid medium is transferred to the constant temperature liquid storage tank (4) through the peristaltic pump (2) and the switching valve (3).

5. The fixed online refractometer calibration device as described in claim 3, characterized in that: A pressure sensor (21) and a degassing pump (22) are installed on the vacuum degassing tank (20). Both the pressure sensor (21) and the degassing pump (22) are connected to the vacuum degassing tank (20). The degassing pump (22) is used to remove dissolved gases from the liquid in the vacuum degassing tank (20), and the pressure sensor (21) is used to monitor the pressure in the vacuum degassing tank (20).

6. The fixed online refractometer calibration device as described in claim 1, characterized in that: The circulation pipeline (23) is also equipped with a first electric valve (11), a filter (12), a gear pump (13), and a gear flow meter (14). The first electric valve (11) is connected to the constant temperature storage tank (4) and the filter (12) respectively. The gear pump (13) is connected to the filter (12) and the gear flow meter (14) respectively. The gear flow meter (14) is connected to the first reference refractometer (15).

7. The fixed online refractometer calibration device as described in claim 1, characterized in that: The fixed online refractometer calibration device also includes a second pipe (30), which is connected to the circulation pipe (23). The connection point is located between the first electric valve (11) and the constant temperature storage tank (4). The second pipe (30) contains two recovery pipes (301), which are connected to the inorganic waste liquid tank (8) and the organic waste liquid tank (9) respectively. Each recovery pipe (301) is equipped with a second electric valve (302). A sampling port (10) is provided at the end of the second pipe (30).

8. The fixed online refractometer calibration device as described in claim 1, characterized in that: The constant temperature storage tank (4) is equipped with a second pressure sensor (41) and a second temperature sensor (42). The second pressure sensor (41) is used to detect the pressure inside the constant temperature storage tank (4), and the second temperature sensor (42) is used to detect the temperature of the liquid medium inside the constant temperature storage tank (4).

9. The fixed online refractometer calibration device as described in claim 1, characterized in that: The thermostatic liquid storage tank (4) is equipped with a semiconductor temperature controller (43) and a third temperature sensor (44) on the outside. The semiconductor temperature controller (43) is used to control the temperature of the liquid in the thermostatic liquid storage tank (4), and the third temperature sensor (44) is used to detect the temperature of the semiconductor temperature controller (43).

10. The fixed online refractometer calibration device as described in claim 1, characterized in that: An insulation sleeve (230) is also provided on the circulation pipe (23). The insulation sleeve (230) is located outside the circulation pipe (23), and the inside of the sleeve is in circulation with the constant temperature water bath (24). The temperature of the liquid medium flowing through the circulation pipe (23) is maintained by adjusting the temperature of the external circulating water bath of the constant temperature water bath (24).

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