A value determination device and method for low-temperature viscosity liquids

Abstract

The present invention relates to the technical field of low-temperature viscosity liquid value determination, and discloses a device and method for determining the value of a low-temperature viscosity liquid, including a housing. A tank body is formed inside the housing. A baffle is fixedly installed on the inner wall of the tank body. A standard capillary viscometer is arranged on the left side of the baffle, and a stirring device, a heating device and a refrigerating device are arranged on the right side of the baffle. The suspension bulb and the reservoir bulb of the standard capillary viscometer are on the same straight line, and the main tube extends into the reservoir bulb, and an inert gas can be introduced to evacuate the air inside it, so that the whole standard capillary viscometer is in an inert atmosphere to avoid contamination. At the same time, the constant temperature device of the present invention is a closed tank body opened inside the housing, which is suitable for the size of the standard capillary viscometer and meets the constant temperature accuracy. The present invention has novel design and has the advantages of being able to determine the value of the viscosity liquid at low temperature, high value determination accuracy, good temperature control effect, and preventing low-temperature contamination of the viscosity liquid to be measured.

Description

Technical Field

[0001] The present invention relates to the technical field of low-temperature viscosity liquid calibration, and specifically to a calibration device and method for low-temperature viscosity liquid. Background Art

[0002] In the quantity transfer system of viscosity measurement, a viscometer and viscosity liquid are alternately used for transfer until the viscosity value of a sample is measured. The viscosity liquid plays a connecting role in the viscosity quantity transfer process.

[0003] The measurement of low-temperature viscosity mainly adopts the rotational method and the capillary method. Among them, the capillary viscometer, as an absolute viscometer, is recognized as the method with the highest accuracy in viscosity measurement. In the viscosity measurement quantity transfer system diagram, the national viscosity standard and national standard are both Ubbelohde capillary viscometers. The advantage of high accuracy of the capillary viscometer makes it not only an important means for sample viscosity measurement but also shoulders the heavy responsibility of quantity transfer. The standard capillary viscometer is larger in volume and higher in accuracy than the working capillary viscometer. When calibrating the viscosity liquid with the standard capillary viscometer under normal conditions, the viscosity liquid needs to be filled into the standard capillary viscometer, and the whole standard capillary viscometer needs to be kept at a constant temperature. The constant temperature equipment is a large-size transparent glass constant temperature bath, which is convenient for human eyes to observe and time. The temperature accuracy is ±0.01 °C, and the accuracy of the calibrated viscosity liquid is better than 0.8%.

[0004] Since the low-temperature viscosity measurement range is generally as low as -40 °C, and the operating temperature of aviation hydraulic oil is even as low as -70 °C, the transparent glass constant temperature bath under normal conditions is difficult to withstand such low temperatures. At the same time, most viscosity liquids are oil products, and their viscosity values are greatly affected by temperature, especially at low temperatures, the viscosity values change greatly with temperature. This type of technology is not suitable for calibrating low-temperature viscosity liquids.

[0005] The calibration of existing low-temperature viscosity liquids often uses a rotational viscometer or a working capillary viscometer. The reason is that the measuring head part and the rotor part of the former are independent. During measurement, only the rotor part needs to be precisely kept at a constant temperature, and there is no need to observe the state of the fluid to be measured. The latter can use a special double-layer glass constant temperature bath to achieve constant temperature and meet human eye observation at the same time. However, the accuracy of such equipment itself is greater than 0.8%, and the accuracy of the calibrated viscosity liquid is relatively low. The measurement accuracy of the rotational method principle is not as good as that of the capillary method, and the development and research for precise measurement are limited; the size of the standard capillary viscometer is too large, and only using double-layer glass technology, the constant temperature precision is limited. The design size and temperature control accuracy of the existing low-temperature capillary viscometer device are also difficult to apply to the standard capillary viscometer, which limits the calibration of low-temperature viscosity liquids.

[0006] During the calibration process of the capillary viscometer, the uncertainties mainly stem from: the accuracy of the selected capillary viscometer, the temperature control fluctuation, the uniformity of the viscosity liquid, the verticality of the capillary viscometer, and the timing. Therefore, using a standard capillary viscometer to calibrate the viscosity liquid will be beneficial to greatly improve the calibration accuracy of the viscosity liquid. The low-temperature constant-temperature equipment used for calibrating the viscosity liquid with a standard capillary viscometer should meet the requirements of a large size with a working area depth of not less than 80 cm, a temperature control accuracy of ±0.002 °C, be convenient for observation and timing, and at the same time be convenient for maintaining the verticality of the standard capillary viscometer during operation.

[0007] In addition, under low-temperature conditions, when the humidity of the atmospheric environment is relatively high, frost and fog will form around the supercooled wall surface of the viscometer exposed to the environment, causing pollution to the fluid to be measured and introducing errors during the calibration and measurement processes. For example, a large amount of frost forms at the contact position between the nozzle of the existing low-temperature capillary viscometer device and the liquid level of the refrigeration medium, which also limits the calibration accuracy of the low-temperature viscosity liquid.

[0008] During the calibration process of the low-temperature viscometer, the large uncertainty introduced by the inaccuracy of the calibration result of the low-temperature viscosity liquid is not conducive to the unification of the quantity value. The problem of accurately calibrating the low-temperature viscosity liquid has become an important bottleneck restricting the low-temperature viscosity metrology transfer.

[0009] Based on this, we propose a calibration device and method for low-temperature viscosity liquid, hoping to solve the deficiencies in the existing technology. Summary of the Invention

[0010] (1) Technical problems to be solved

[0011] Aiming at the deficiencies of the existing technology, the present invention provides a calibration device and method for low-temperature viscosity liquid, which has the advantages of being able to calibrate the viscosity liquid at low temperature, high calibration accuracy, good temperature control effect, and preventing low-temperature pollution of the viscosity liquid to be measured.

[0012] (2) Technical solutions

[0013] To achieve the above-mentioned purposes of being able to calibrate the viscosity liquid at low temperature, high calibration accuracy, good temperature control effect, and preventing low-temperature pollution of the viscosity liquid to be measured, the present invention provides the following technical solutions: A calibration device for low-temperature viscosity liquid, including a housing, a tank body is formed inside the housing, a baffle is fixedly installed on the inner wall of the tank body, a standard capillary viscometer is arranged on the left side of the baffle, and a stirring device, a heating device and a refrigeration device are arranged on the right side of the baffle;

[0014] A disc member is inserted at the top of the standard capillary viscometer, an external thread is provided on the outer wall of the disc member, and a positioning bracket is threadedly connected to the outer wall of the external thread. The positioning bracket is fixedly installed on the top of the lifting platform.

[0015] As a preferred technical solution of the present invention, the stirring device includes a motor and a stirring rod. The motor is fixedly installed on the top of the outer shell, the stirring rod is fixedly installed on the top of the output shaft of the motor, and stirring blades are also fixedly installed on the outer wall of the stirring rod;

[0016] The heating device is an electric heating tube, which is arranged around the upper half of the stirring rod, and the refrigerating device is a refrigerating tube, which is arranged around the lower half of the stirring rod.

[0017] As a preferred technical solution of the present invention, the standard capillary viscometer includes a main pipe, a first branch pipe and a second branch pipe which are arranged in parallel in the same plane. A liquid level ball, a timing ball and a suspension ball are sequentially arranged in the main pipe from top to bottom. An upper scale line is arranged at the top of the timing ball, a lower scale line is arranged at the bottom of the timing ball, a capillary fitting is arranged between the timing ball and the suspension ball, the bottom end of the second branch pipe is communicated with the suspension ball, a liquid inlet pipe is fixedly installed at the bottom of the main pipe, the liquid inlet pipe is inserted into the internal part of a liquid storage ball, and the liquid storage ball is communicated with the bottom end of the first branch pipe.

[0018] As a preferred technical solution of the present invention, an observation window is further arranged on the outer wall of the outer shell, and the position of the observation window corresponds to the position of the timing ball;

[0019] The observation window is of a multi-layer glass structure, and a defrosting and drying technology is adopted between the multi-layers of glass.

[0020] As a preferred technical solution of the present invention, a U-shaped frame is fixedly installed at the bottom of the disc part. A first fixing clip and a second fixing clip are movably arranged on the outer wall of the U-shaped frame. The inner wall of the first fixing clip is movably connected with the first branch pipe, and a light source is fixedly installed at the end of the second fixing clip. The installation position of the light source corresponds to the position of the timing ball.

[0021] As a preferred technical solution of the present invention, the positioning frame includes a connecting sleeve, a sealing ring and a connecting rod. The disc part is threadedly connected to the inner wall of the connecting sleeve. A sealing cover is fixedly installed at the top of the disc part. A sealing ring is movably arranged on the outer wall of the connecting sleeve, and the sealing ring is fixedly installed on the inner top wall of the outer shell;

[0022] A connecting rod is further fixedly installed on the outer wall of the connecting sleeve. An activity groove is formed on the outer wall at the end of the connecting rod, and a positioning bolt is movably arranged on the inner wall of the activity groove;

[0023] The lifting platform includes a bottom cylinder and an electric push rod. The electric push rod is arranged inside the bottom cylinder. A lifting rod is fixedly installed at the top of the output shaft of the electric push rod. The positioning bolt is threadedly connected to the top of the lifting rod and is used for fixedly installing the connecting rod on the top of the lifting rod.

[0024] As a preferred technical solution of the present invention, a first air pipe and a second air pipe are fixedly installed opposite to each other on the outer wall of the sealing cover;

[0025] A first through pipe and a second through pipe are fixedly installed adjacent to each other on the outer wall of the sealing cover. The bottom ends of the first through pipe and the second through pipe are respectively and softly connected to the top ends of the second branch pipe and the main pipe (201). A first solenoid valve and a second solenoid valve are respectively arranged inside the first through pipe and the second through pipe;

[0026] A first inert gas source is arranged at the end of the first air pipe, a second inert gas source is arranged at the end of the first through pipe, and a vacuum pump is arranged at the end of the second through pipe;

[0027] The input ends of the first inert gas source and the second inert gas source are electrically connected to an inert gas controller, and the input end of the vacuum pump is electrically connected to a vacuum pumping device controller.

[0028] A method for determining the value of a low-temperature viscosity liquid, which is used for a device for determining the value of a low-temperature viscosity liquid, includes the following steps:

[0029] S01. Installation: Vertically install the cleaned standard capillary viscometer on the U-shaped frame, check the position of the standard capillary viscometer on the U-shaped frame. When the capillary fitting on the main pipe is parallel to the U-shaped frame, it can be considered that the position of the standard capillary viscometer is vertical. Connect the lifting table, the positioning frame and the U-shaped frame, and adjust the relative position with the tank body. Install a thermometer at the center of the disc part;

[0030] S02. Liquid filling: Use a syringe to add the viscosity liquid to be determined from the nozzle of the first branch pipe to the liquid storage bulb;

[0031] S03. Sealing: Connect the first air pipe to the first inert gas source, connect the second air pipe to the atmosphere, softly connect the first through pipe to the second branch pipe, softly connect the second through pipe to the main pipe. The outside of the first through pipe is connected to the second inert gas source through the first solenoid valve, and the second through pipe is connected to the vacuum pump through the second solenoid valve;

[0032] S04. Inert atmosphere: Open the first solenoid valve and the second solenoid valve, open the second inert gas source, so that the inert gas enters the second branch pipe. The inert gas will first flow out of the main pipe through the second solenoid valve to discharge the air inside the main pipe. After a period of time, close the second solenoid valve to seal the main pipe, and continue to pass the inert gas. The inert gas will enter the first branch pipe through the liquid inlet pipe to discharge the air inside the first branch pipe. Open the first inert gas source, gradually discharge the air inside the sealing cover. At this time, cut off the second inert gas source, close the first solenoid valve. After a period of time, the whole standard capillary viscometer is in an inert atmosphere;

[0033] S05. Constant temperature: Set the target temperature of the tank body, based on the measurement result of the thermometer, adjust it to the value determination temperature, and keep it at a constant temperature for more than 20 minutes until the temperature is uniform;

[0034] S06. Measurement: Close the first solenoid valve to seal the second branch pipe, open the second solenoid valve, and turn on the vacuum pump to provide negative pressure to the main pipe. Slowly suck the viscosity liquid to be measured from the liquid storage ball into the timing ball. Turn on the light source and observe through the observation window. When the viscosity liquid reaches the liquid level ball, cut off the vacuum pump;

[0035] Then, open the first solenoid valve to connect the second branch pipe to the atmosphere. At this time, the viscosity liquid inside the suspension ball quickly flows back to the liquid storage ball; the viscosity liquid inside the timing ball slowly flows down along the capillary fitting under the action of gravity; observe through the observation window, and use the timing device to record the time difference between the upper liquid level of the fluid flowing through the upper scale line and the lower scale line. Repeat the experiment six times and take the average time. Combining with the standard capillary viscometer constant, the kinematic viscosity value of the viscosity liquid to be measured can be obtained from the formula υ = C·Δt. Further, combining with the density measurement result, the dynamic viscosity value of the viscosity liquid to be measured can be obtained from the formula η = ρ·υ.

[0036] (III) Beneficial effects

[0037] Compared with the prior art, the present invention provides a device and method for determining the value of a low-temperature viscosity liquid, which have the following beneficial effects:

[0038] 1. For the device and method for determining the value of a low-temperature viscosity liquid, the suspension ball and the liquid storage ball of the standard capillary viscometer are on the same straight line, and the main pipe extends into the liquid storage ball, and inert gas can be introduced to evacuate the air inside it, so that the whole standard capillary viscometer is in an inert atmosphere, avoiding pollution. At the same time, the constant temperature device of the present invention is a closed tank arranged inside the outer shell, suitable for the size of the standard capillary viscometer, meeting the constant temperature accuracy of ±0.002 °C. The tank is provided with an observation window to realize observation and timing, so as to complete the accurate determination of the low-temperature viscosity liquid.

[0039] 2. For the device and method for determining the value of a low-temperature viscosity liquid, the observation window is a multi-layer glass component structure, and a defrosting and drying technology is adopted between the glass layers to avoid the condensation of fog on the glass layers under low-temperature working conditions and affect normal observation.

[0040] 3. For the device and method for determining the value of a low-temperature viscosity liquid, a standard capillary viscometer is adopted, and the accuracy is improved compared with the rotational viscometer and the working capillary viscometer. Description of the drawings

[0041] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0042] Figure 2 It is a cross-sectional view of the overall structure of the present invention;

[0043] Figure 3 It is an enlarged schematic diagram of the standard capillary viscometer of the present invention;

[0044] Figure 4 This is a side sectional view of the overall structure of the present invention;

[0045] Figure 5 This is an enlarged schematic view of the U-shaped frame part of the present invention;

[0046] Figure 6 This is a top view of the present invention;

[0047] Figure 7 This is a schematic view of the sealing cover part of the present invention.

[0048] In the figure: 1. Outer shell; 2. Standard capillary viscometer; 201. Main pipe; 202. First branch pipe; 203. Second branch pipe; 204. Liquid level ball; 205. Timing ball; 206. Upper scale line; 207. Lower scale line; 208. Capillary fitting; 209. Suspension ball; 210. Liquid inlet pipe; 211. Liquid storage ball; 3. U-shaped frame; 4. Positioning frame; 401. Connecting sleeve; 402. Sealing ring; 403. Connecting rod; 404. Activity groove; 405. Positioning bolt; 5. Sealing cover; 501. First air pipe; 502. Second air pipe; 503. First through pipe; 504. Second through pipe; 505. First solenoid valve; 506. Second solenoid valve; 507. First inert gas source; 508. Second inert gas source; 509. Vacuum pump; 6. Lifting platform; 601. Bottom cylinder; 602. Electric push rod; 603. Lifting rod; 7. Observation window; 8. Tank body; 9. Stirring device; 10. Heating device; 11. Refrigeration device; 12. Baffle; 13. Disc part; 14. External thread; 15. Light source; 16. First fixing clip; 17. Second fixing clip; 18. Inert gas controller; 19. Vacuum pumping device controller. Detailed implementation manners

[0049] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0050] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0051] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] Please refer to Figures 1-7 , a calibration device for low-temperature viscosity liquid, comprising a housing 1. A tank body 8 is formed inside the housing 1. A baffle 12 is fixedly installed on the inner wall of the tank body 8. A standard capillary viscometer 2 is arranged on the left side of the baffle 12, and a stirring device 9, a heating device 10 and a refrigerating device 11 are arranged on the right side of the baffle 12;

[0053] A disc member 13 is inserted at the top of the standard capillary viscometer 2. External threads 14 are provided on the outer wall of the disc member 13. A positioning frame 4 is threadedly connected to the outer wall of the external threads 14. The positioning frame 4 is fixedly installed on the top of the lifting platform 6.

[0054] In this embodiment, the stirring device 9 includes a motor and a stirring rod. The motor is fixedly installed on the top of the housing 1. The stirring rod is fixedly installed on the top of the output shaft of the motor. Stirring blades are also fixedly installed on the outer wall of the stirring rod;

[0055] The heating device 10 is an electric heating tube, which is arranged around the upper half of the stirring rod. The refrigerating device 11 is a refrigerating tube, which is arranged around the lower half of the stirring rod.

[0056] In this embodiment, the suspension bulb 209 and the storage bulb 211 of the standard capillary viscometer 2 are located in the main tube 201 and are on the same straight line, and the main tube 201 extends into the storage bulb 211. The storage bulb 211 of the traditional standard capillary viscometer 2 is located directly below the bottom of the first branch tube 202 and is directly connected to the suspension bulb 209. The standard capillary viscometer 2 in this embodiment can introduce inert gas to evacuate the air inside it, so that the whole is in an inert atmosphere to avoid contamination;

[0057] The standard capillary viscometer 2 includes a main tube 201, a first branch tube 202 and a second branch tube 203 that are arranged in parallel in the same plane. The main tube 201, the first branch tube 202 and the second branch tube 203 of the traditional standard capillary viscometer 2 are not in the same plane and are distributed in a triangle. In this embodiment, the main tube 201, the first branch tube 202 and the second branch tube 203 are arranged in parallel in the same plane, which is beneficial to observing and timing through the observation window 7. Compared with the traditional standard capillary viscometer 2, the upper and lower timing scales of the main tube 201 are avoided from being blocked;

[0058] Compared with the traditional standard capillary viscometer 2, the standard capillary viscometer 2 in this embodiment has no quantitative requirement for the sample addition amount of the fluid to be measured, retains the basic characteristics of the main pipe 201 of the traditional standard capillary viscometer 2, ensures the effectiveness and the accuracy of the standard device level in principle, and can achieve good results;

[0059] Inside the main pipe 201, a liquid level ball 204, a timing ball 205 and a suspension ball 209 are sequentially arranged from top to bottom. An upper scale line 206 is arranged at the top of the timing ball 205, a lower scale line 207 is arranged at the bottom of the timing ball 205, a capillary fitting 208 is arranged between the timing ball 205 and the suspension ball 209. The bottom end of the second branch pipe 203 is communicated with the suspension ball 209. A liquid inlet pipe 210 is fixedly installed at the bottom of the main pipe 201. The liquid inlet pipe 210 is inserted into the inside of the liquid storage ball 211. The liquid storage ball 211 is communicated with the bottom end of the first branch pipe 202.

[0060] In this embodiment, an observation window 7 is further arranged on the outer wall of the outer shell 1. The position of the observation window 7 corresponds to the position of the timing ball 205;

[0061] The observation window 7 is a multi-layer glass structure. The defrosting and drying technology is adopted between the multi-layers of glass to avoid the fog condensation on the glass layer under low-temperature working conditions and affect the normal observation.

[0062] In this embodiment, a U-shaped frame 3 is fixedly installed at the bottom of the disc member 13. A first fixed clamp 16 and a second fixed clamp 17 are movably arranged on the outer wall of the U-shaped frame 3. The inner wall of the first fixed clamp 16 is movably connected with the first branch pipe 202. The end of the second fixed clamp 17 is fixedly installed with a light source 15. The installation position of the light source 15 corresponds to the position of the timing ball 205.

[0063] In this embodiment, the positioning frame 4 includes a connecting sleeve 401, a sealing ring 402 and a connecting rod 403. The disc member 13 is threadedly connected to the inner wall of the connecting sleeve 401. A sealing cover 5 is fixedly installed at the top of the disc member 13. The sealing ring 402 is movably arranged on the outer wall of the connecting sleeve 401. The sealing ring 402 is fixedly installed on the inner top wall of the outer shell 1;

[0064] A connecting rod 403 is further fixedly installed on the outer wall of the connecting sleeve 401. An activity groove 404 is formed on the outer wall of the end of the connecting rod 403. A positioning bolt 405 is movably arranged on the inner wall of the activity groove 404;

[0065] The lifting platform 6 includes a bottom cylinder 601 and an electric push rod 602. The electric push rod 602 is arranged inside the bottom cylinder 601. The top of the output shaft of the electric push rod 602 is fixedly installed with a lifting rod 603. The positioning bolt 405 is threadedly connected to the top of the lifting rod 603 and is used to fixedly install the connecting rod 403 on the top of the lifting rod 603;

[0066] The lifting platform 6 controls the lifting of the standard capillary viscometer 2 and slowly moves it to the target position of the tank body 8. In addition, the support positioning frame 4 is used to prevent the measuring part from contacting the constant temperature part, avoiding the influence of vibration on the measurement.

[0067] In this embodiment, a first air pipe 501 and a second air pipe 502 are fixedly installed on the outer wall of the sealing cover 5 opposite to each other;

[0068] A first through pipe 503 and a second through pipe 504 are fixedly installed adjacent to the outer wall of the sealing cover 5. The bottom ends of the first through pipe 503 and the second through pipe 504 are respectively soft-connected to the top ends of the second branch pipe 203 and the main pipe 201. A first solenoid valve 505 and a second solenoid valve 506 are respectively arranged inside the first through pipe 503 and the second through pipe 504;

[0069] The end of the first air pipe 501 is provided with a first inert gas source 507, the end of the first through pipe 503 is provided with a second inert gas source 508, and the end of the second through pipe 504 is provided with a vacuum pump 509;

[0070] The input ends of the first inert gas source 507 and the second inert gas source 508 are electrically connected to an inert gas controller 18, and the input end of the vacuum pump 509 is electrically connected to a vacuum pumping device controller 19.

[0071] A method for determining the value of a low-temperature viscosity liquid, which is used for a device for determining the value of a low-temperature viscosity liquid, includes the following steps:

[0072] Step 1. Installation: Vertically install the cleaned standard capillary viscometer 2 on the U-shaped frame 3, check the position of the standard capillary viscometer 2 on the U-shaped frame 3. When the capillary fitting 208 on the main pipe 201 is parallel to the U-shaped frame 3, it can be considered that the standard capillary viscometer 2 is vertically positioned. Connect the lifting platform 6, the positioning frame 4 and the U-shaped frame 3, and adjust the relative position with the tank body 8. Install a thermometer at the center of the disc part 13;

[0073] Step 2. Liquid filling: Use a syringe to add the viscosity liquid to be determined from the nozzle of the first branch pipe 202 to the liquid storage ball 211;

[0074] Step 3. Sealing: Connect the first air pipe 501 to the first inert gas source 507, connect the second air pipe 502 to the atmosphere, soft-connect the first through pipe 503 to the second branch pipe 203, soft-connect the second through pipe 504 to the main pipe 201. Connect the outside of the first through pipe 503 to the second inert gas source 508 through the first solenoid valve 505, and connect the second through pipe 504 to the vacuum pump 509 through the second solenoid valve 506;

[0075] Step 4, inert atmosphere: open the first solenoid valve 505, the second solenoid valve 506, open the second inert gas source 508, and allow the inert gas to enter the second branch pipe 203. The inert gas will first flow out from the main pipe 201 through the second solenoid valve 506 to exhaust the air inside the main pipe 201. After a period of time, close the second solenoid valve 506 to seal the main pipe 201, and continue to pass the inert gas. The inert gas will enter the first branch pipe 202 through the liquid inlet pipe 210 to exhaust the air inside the first branch pipe 202. Open the first inert gas source 507 to gradually exhaust the air in the sealing cover 5. At this time, cut off the second inert gas source 508, close the first solenoid valve 505, and after a period of time, the standard capillary viscometer 2 is in an inert atmosphere as a whole;

[0076] Step 5, constant temperature: set the target temperature of the tank 8, and adjust it to a fixed temperature according to the measurement result of the thermometer, and keep the temperature constant for more than 20 minutes until the temperature is uniform;

[0077] Step 6, measurement: close the first solenoid valve 505 to seal the second branch pipe 203, open the second solenoid valve 506, and turn on the vacuum pump 509 to provide negative pressure to the main pipe 201, slowly suck the viscosity liquid to be measured from the liquid storage ball 211 into the timing ball 205, turn on the light source 15, observe through the observation window 7, and cut off the vacuum pump 509 when the viscosity liquid reaches the liquid level ball 204;

[0078] Then, open the first electromagnetic valve 505 to connect the second branch pipe 203 to the atmosphere. At this time, the viscosity liquid inside the suspension ball 209 quickly flows back to the liquid storage ball 211; the viscosity liquid inside the timing ball 205 slowly flows down along the capillary member 208 under the action of gravity; observe through the observation window 7, and use a timing device to record the time difference between the upper liquid surface of the fluid flowing through the upper scale line 206 and the lower scale line 207. The experiment is repeated six times and the average time is taken. Combined with the constant of the standard capillary viscometer 2, the kinematic viscosity value of the viscosity liquid to be measured can be obtained by the formula υ=C·Δt. Further, combined with the density measurement result, the dynamic viscosity value of the viscosity liquid to be measured can be obtained by the formula η=ρ·υ.

[0079] The working principle and use process of the present invention:

[0080] Installation: Install the cleaned standard capillary viscometer 2 vertically on the U-shaped frame 3, check the position of the standard capillary viscometer 2 on the U-shaped frame 3, when the capillary member 208 on the main pipe 201 is parallel to the U-shaped frame 3, it can be considered that the standard capillary viscometer 2 is vertical, connect the lifting platform 6, the positioning frame 4 and the U-shaped frame 3, and adjust the relative position with the tank body 8, and install a thermometer at the center of the disc member 13;

[0081] Filling liquid: Use a syringe to add a liquid with a viscosity to be determined from the opening of the first branch tube 202 to the liquid storage ball 211;

[0082] Sealing: The first trachea 501 is connected to the first inert gas source 507, the second trachea 502 is connected to the atmosphere, the first through pipe 503 is flexibly connected to the second branch pipe 203, the second through pipe 504 is flexibly connected to the main pipe 201, the outside of the first through pipe 503 is connected to the second inert gas source 508 through the first solenoid valve 505, and the second through pipe 504 is connected to the vacuum pump 509 through the second solenoid valve 506;

[0083] Inert atmosphere: Open the first solenoid valve 505 and the second solenoid valve 506, open the second inert gas source 508, so that the inert gas enters the second branch pipe 203. The inert gas will first flow out of the main pipe 201 through the second solenoid valve 506 to discharge the air inside the main pipe 201. After a period of time, close the second solenoid valve 506 to seal the main pipe 201, and continue to supply the inert gas. The inert gas will enter the first branch pipe 202 through the liquid inlet pipe 210 to discharge the air inside the first branch pipe 202. Open the first inert gas source 507 to gradually discharge the air inside the sealing cover 5. At this time, cut off the second inert gas source 508, close the first solenoid valve 505. After a period of time, the entire standard capillary viscometer 2 is in an inert atmosphere;

[0084] Constant temperature: Set the target temperature of the tank body 8, based on the measurement result of the thermometer, adjust it to a fixed temperature, and keep the temperature constant for more than 20 minutes until the temperature is uniform;

[0085] Measurement: Close the first solenoid valve 505 to seal the second branch pipe 203, open the second solenoid valve 506 and open the vacuum pump 509 to provide negative pressure to the main pipe 201. Slowly suck the viscosity liquid to be measured from the liquid storage ball 211 into the timing ball 205. Turn on the light source 15 and observe through the observation window 7. When the viscosity liquid reaches the liquid level ball 204, cut off the vacuum pump 509;

[0086] Then, open the first solenoid valve 505 to connect the second branch pipe 203 to the atmosphere. At this time, the viscosity liquid inside the suspension ball 209 quickly flows back to the liquid storage ball 211; the viscosity liquid inside the timing ball 205 slowly flows down along the capillary fitting 208 under the action of gravity; observe through the observation window 7 and use the timing device to record the time difference between the upper liquid level of the fluid flowing through the upper scale line 206 and the lower scale line 207. Repeat the experiment six times and take the average time. Combine the constant of the standard capillary viscometer 2. The kinematic viscosity value of the viscosity liquid to be measured can be obtained from the formula υ = C·Δt. Further, combined with the density measurement result, the dynamic viscosity value of the viscosity liquid to be measured can be obtained from the formula η = ρ·υ.

[0087] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A value-setting device for low-temperature viscosity liquid, comprising a housing (1), characterized in that: A groove (8) is formed inside the housing (1). A baffle (12) is fixedly installed on the inner wall of the groove (8). On the left side of the baffle (12), a standard capillary viscometer (2) is provided. On the right side of the baffle (12), a stirring device (9), a heating device (10) and a refrigerating device (11) are provided; A disc member (13) is inserted into the top of the standard capillary viscometer (2). External threads (14) are provided on the outer wall of the disc member (13). A positioning frame (4) is threadedly connected to the outer wall of the external threads (14). The positioning frame (4) is fixedly installed on the top of the lifting table (6); The stirring device (9) includes a motor and a stirring rod. The motor is fixedly installed on the top of the housing (1). The stirring rod is fixedly installed on the top of the output shaft of the motor. Stirring blades are also fixedly installed on the outer wall of the stirring rod; The heating device (10) is an electric heating tube, which is arranged around the upper half of the stirring rod. The refrigerating device (11) is a refrigerating tube, which is arranged around the lower half of the stirring rod; The standard capillary viscometer (2) includes a main pipe (201), a first branch pipe (202) and a second branch pipe (203) that are arranged in parallel in the same plane. Inside the main pipe (201), a liquid level ball (204), a timing ball (205) and a suspension ball (209) are arranged in sequence from top to bottom. An upper scale line (206) is provided at the top of the timing ball (205). A lower scale line (207) is provided at the bottom of the timing ball (205). A capillary fitting (208) is arranged between the timing ball (205) and the suspension ball (209). The bottom end of the second branch pipe (203) communicates with the suspension ball (209). A liquid inlet pipe (210) is also fixedly installed at the bottom of the main pipe (201). The liquid inlet pipe (210) is inserted into the inside of a liquid storage ball (211). The liquid storage ball (211) communicates with the bottom end of the first branch pipe (202); A U-shaped frame (3) is fixedly installed at the bottom of the disc member (13). A first fixing clip (16) and a second fixing clip (17) are movably arranged on the outer wall of the U-shaped frame (3). The inner wall of the first fixing clip (16) is movably connected to the first branch pipe (202). A light source (15) is fixedly installed at the end of the second fixing clip (17). The installation position of the light source (15) corresponds to the position of the timing ball (205).

2. The fixed value device for low-temperature viscosity liquid according to claim 1, characterized in that: The positioning frame (4) includes a connecting sleeve (401), a sealing ring (402) and a connecting rod (403). The disc member (13) is threadedly connected to the inner wall of the connecting sleeve (401). A sealing cover (5) is fixedly installed on the top of the disc member (13). A sealing ring (402) is movably arranged on the outer wall of the connecting sleeve (401). The sealing ring (402) is fixedly installed on the inner top wall of the housing (1); A connecting rod (403) is also fixedly installed on the outer wall of the connecting sleeve (401). An activity groove (404) is provided on the outer wall at the end of the connecting rod (403). A positioning bolt (405) is movably arranged on the inner wall of the activity groove (404); The lifting table (6) includes a bottom cylinder (601) and an electric push rod (602). The electric push rod (602) is arranged inside the bottom cylinder (601). The top of the output shaft of the electric push rod (602) is fixedly installed with a lifting rod (603). The positioning bolt (405) is threadedly connected to the top of the lifting rod (603) and is used to fixedly install the connecting rod (403) on the top of the lifting rod (603).

3. The value determination device for low-temperature viscosity liquid according to claim 2, characterized in that: On the opposite outer walls of the sealing cover (5), a first air pipe (501) and a second air pipe (502) are fixedly installed; On the adjacent outer walls of the sealing cover (5), a first through pipe (503) and a second through pipe (504) are fixedly installed. The bottom ends of the first through pipe (503) and the second through pipe (504) are respectively soft-connected to the top ends of the second branch pipe (203) and the main pipe (201). A first solenoid valve (505) and a second solenoid valve (506) are respectively arranged inside the first through pipe (503) and the second through pipe (504); The end of the first air pipe (501) is provided with a first inert gas source (507). The end of the first through pipe (503) is provided with a second inert gas source (508). The end of the second through pipe (504) is provided with a vacuum pump (509); The input ends of the first inert gas source (507) and the second inert gas source (508) are electrically connected to an inert gas controller (18). The input end of the vacuum pump (509) is electrically connected to a vacuum pumping device controller (19).

4. A value determination method for a low-temperature viscosity liquid, which is used for a value determination device for a low-temperature viscosity liquid according to any one of claims 1-3, characterized in that: It includes the following steps: S01, Installation: Vertically install the cleaned standard capillary viscometer (2) on the U-shaped frame (3). Check the position of the standard capillary viscometer (2) on the U-shaped frame (3). When the capillary fitting (208) on the main pipe (201) is parallel to the U-shaped frame (3), it can be considered that the position of the standard capillary viscometer (2) is vertical. Connect the lifting table (6), the positioning frame (4) and the U-shaped frame (3), and adjust the relative position with the tank body (8). A thermometer is installed at the center of the disc part (13); S02, Liquid filling: Use a syringe to add the viscosity liquid to be determined from the nozzle of the first branch pipe (202) to the liquid storage sphere (211); S03, Sealing: Connect the first air pipe (501) to the first inert gas source (507), connect the second air pipe (502) to the atmosphere, soft-connect the first through pipe (503) to the second branch pipe (203), soft-connect the second through pipe (504) to the main pipe (201). The outside of the first through pipe (503) is connected to the second inert gas source (508) through the first solenoid valve (505), and the second through pipe (504) is connected to the vacuum pump (509) through the second solenoid valve (506); S04. Inert gas atmosphere: Open the first solenoid valve (505) and the second solenoid valve (506), turn on the second inert gas source (508) to allow inert gas to enter the second branch pipe (203). The inert gas will first flow out of the main pipe (201) through the second solenoid valve (506) to discharge the air inside the main pipe (201). After a period of time, close the second solenoid valve (506) to seal the main pipe (201), and continue to supply inert gas. The inert gas will enter the first branch pipe (202) through the liquid inlet pipe (210) to discharge the air inside the first branch pipe (202). Open the first inert gas source (507) to gradually discharge the air inside the sealing cover (5). At this time, cut off the second inert gas source (508) and close the first solenoid valve (505). After a period of time, the entire standard capillary viscometer (2) is under an inert gas atmosphere; S05. Constant temperature: Set the target temperature of the tank body (8), based on the measurement result of the thermometer, adjust it to a fixed temperature, and keep it at a constant temperature for more than 20 minutes until the temperature is uniform; S06. Measurement: Close the first solenoid valve (505) to seal the second branch pipe (203), open the second solenoid valve (506), and turn on the vacuum pump (509) to provide negative pressure to the main pipe (201). Slowly suck the viscosity liquid to be measured from the liquid storage sphere (211) into the timing sphere (205). Turn on the light source (15), observe through the observation window (7), and cut off the vacuum pump (509) when the viscosity liquid reaches the liquid level sphere (204); Then, open the first solenoid valve (505) to connect the second branch pipe (203) to the atmosphere. At this time, the viscous liquid inside the suspension ball (209) quickly flows back to the liquid storage ball (211); the viscous liquid inside the timing ball (205) slowly flows down along the capillary fitting (208) under the action of gravity; observe through the observation window (7) and use a timing device to record the time difference when the upper liquid level of the fluid flows through the upper scale line (206) and the lower scale line (207). Repeat the experiment six times and take the average time. Combining with the constant of the standard capillary viscometer (2), according to the formula the kinematic viscosity value of the viscous liquid to be measured can be obtained. Further, combining with the density measurement result, according to the formula the dynamic viscosity value of the viscous liquid to be measured can be obtained.

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