Suspension type viscosity density on-line measuring device and method

Abstract

The invention discloses a suspension type viscosity and density on-line measuring device and a suspension type viscosity and density on-line measuring method. The device comprises a cavity, a rotating part, a reference rotor, a suspension rotor, a torsional elastic piece and a distance measuring sensor, the rotating part is fixedly connected to the cavity; the reference rotor is fixedly connected to the outer wall of the rotating shaft, synchronously moves along with the rotating shaft and is higher than the liquid level of measured liquid; a suspension detection end is arranged at the upper end of a suspension body of the suspension rotor, the suspension body is connected with the rotating shaft through a torsion elastic piece, the suspension body suspends in detected liquid, the suspension detection end is exposed out of the detected liquid, and the suspension rotor is driven by the rotating shaft to rotate; the distance measuring sensor fixed in the cavity measures the rotating speed of the reference rotor, the axial displacement of the suspension detection end and the phase difference between the reference rotor and the suspension rotor so as to calculate the viscosity and density of the liquid to be measured. The device has the effects of measuring the density and the viscosity of the liquid in real time and being high in measurement precision.

Description

Technical Field

[0001] The invention relates to the field of industrial measurement, and in particular to a suspension type viscosity density online measurement device and method. Background Art

[0002] There is a huge demand for online measurement and control of fluid viscosity and density in the petrochemical and new energy industries. In particular, the lithium battery industry has developed rapidly in recent years. The measurement of the viscosity of lithium battery slurry is crucial to the quality of lithium battery products. The rotational viscometer is the most important viscosity measurement equipment in the industry, but its defects are: first, the rotational viscometer has a complex structure, and there are many interference factors during measurement. At the same time, there are sealing problems when it is used for online viscosity measurement, which affects the accuracy of the measurement and is not suitable for online viscosity measurement. Second, it is impossible to measure the density of the liquid at the same time, and it is difficult to eliminate the interference of the measured liquid density change on the measured viscosity. Summary of the invention

[0003] In order to solve one or more of the above problems, the present invention provides a suspension viscosity density online measurement device and method.

[0004] According to one aspect of the present invention, the suspension type viscosity density online measuring device comprises: a cavity, a rotating part, a reference rotor, a suspension rotor, a torsion elastic member and a distance measuring sensor; the cavity of the cavity can allow the measured liquid to flow through;

[0005] The rotating part is fixedly connected to the cavity;

[0006] The reference rotor is fixedly connected to the outer wall of the rotating shaft, the reference rotor is higher than the liquid level of the measured liquid, and the reference rotor rotates synchronously with the rotating shaft;

[0007] The upper end of the suspended body which is hollow inside the suspended rotor is provided with a suspended detection end, and the upper end of the suspended body is connected to the rotating shaft through a torsion elastic member, so that the suspended body is suspended in the liquid to be measured and the suspended detection end is exposed to the liquid to be measured, and the suspended rotor is driven to rotate by the rotating shaft;

[0008] The distance sensor is fixedly connected in the cavity. The distance sensor measures the rotation speed of the reference rotor, the axial displacement of the suspended detection end, and the phase difference between the reference rotor and the suspended rotor to calculate the viscosity and density of the liquid to be measured.

[0009] The suspension type viscosity and density online measuring device obtains the liquid density by the axial displacement of the suspension detection end, obtains the liquid viscosity by measuring the phase difference change of the suspension rotor relative to the reference rotor, and corrects the viscosity by the density value, so as to accurately obtain the viscosity and density of the liquid. The device has the following beneficial effects: firstly, the device adopts a suspension rotor structure, the suspension rotor can be independently suspended in the measured liquid, and remain stable during the rotation process, the suspension rotor and the rotating part are only connected by a torsion elastic member, so the viscosity and density measurement is not affected by the friction of other structures and the blockage of debris, the structure is simple, there are fewer interference factors during measurement, there is no sealing problem, and the measurement accuracy is greatly improved; secondly, the device can measure the density and viscosity of the liquid in real time, and the viscosity value can be corrected by density, effectively eliminating the interference of the measured liquid density change on the measured viscosity; thirdly, due to the use of the suspension rotor, the tensile deformation of the torsion elastic member caused by the long-term downward gravity of the rotor can be avoided, and the service life and measurement accuracy of the measuring device can be improved; fourthly, the distance measuring sensor is used to simultaneously measure the rotation parameters of the reference suspension rotor and the reference rotor, the structure is simple, the reliability is high, and it can be applied to different measurement environments with and without magnetic field interference.

[0010] In some embodiments, the measurement and control unit disposed outside the cavity is electrically connected to the distance measuring sensor and the rotating part;

[0011] Or it also includes a temperature sensor electrically connected to the measurement and control unit, and the temperature sensor is installed inside the cavity and in contact with the measured liquid.

[0012] In some embodiments, the suspended rotor is a metal thin-walled inverted conical shell, which includes a hollow suspended body with a cylindrical shell at the upper end and a truncated cone with the cone tip facing downward at the lower end. The lower stud of the truncated cone can be detachably connected to the counterweight block, and the support member and the cylindrical shell can be detachably connected by a threaded connection or a plurality of radial threaded members in a circular array.

[0013] In some embodiments, the lower connecting end of the support member is sleeved with an equal diameter on the inner wall of the cylindrical shell, the positioning shoulder of the support member is fitted and connected to the upper wall of the cylindrical shell, and the lower connecting end and the cylindrical shell are connected by a circumferential thread or a radial thread.

[0014] In some embodiments, the rotating part includes a first motor, an external driving magnet, an internal driving magnet, a rotating shaft seat, and a rotating shaft; the rotating shaft seat is fixedly connected to the upper wall of the cavity, the middle of the rotating shaft is rotatably connected to the rotating shaft seat, the upper end of the rotating shaft is installed with the internal driving magnet, the internal driving magnet is directly opposite to the external driving magnet outside the cavity, and the external driving magnet is installed on the motor shaft of the first motor;

[0015] Or the rotating part includes a stepper motor and a rotating shaft, the motor shaft of the stepper motor is the rotating shaft, the stepper motor is fixed outside the upper cover of the cavity, and the middle shaft sleeve of the rotating shaft is a sealing ring in the upper through hole of the upper cover.

[0016] In some embodiments, the torsion elastic member is a spiral spring hairspring, the outer portion of the hairspring is mounted on the inner side of the support member and the inner portion thereof is mounted on the rotating shaft through a sleeve;

[0017] Or the reference rotor is a narrow strip of metal.

[0018] In some embodiments, the cavity is provided with a liquid inlet and a liquid outlet, the height of the liquid inlet is lower than the height of the liquid outlet, and the height of the reference rotor is higher than the height of the liquid outlet.

[0019] In some embodiments, the distance measuring sensor is at least one optical distance measuring sensor, the support member is a circular ring member, and the suspension detection end is a radial protrusion in the middle of the support member;

[0020] Or the distance measuring sensor is at least one magnetic sensor, the suspension detection end is a first magnetic component arranged on the support, and the reference rotor is installed with a second magnetic component.

[0021] A measurement method using the above-mentioned suspension viscosity density online measurement device comprises the following steps:

[0022] S1. Select and configure an appropriate counterweight according to the density range of the measured liquid, and install it under the frustum of the suspended rotor, so that the suspended rotor can be suspended in the measured liquid and the upper end of its cylindrical shell is higher than the upper surface of the measured liquid;

[0023] S2, the measured liquid enters the cavity from the inlet and reaches the height of the outlet position, the suspended rotor moves upward under the buoyancy of the measured liquid to achieve suspension, and the rotating part drives the reference rotor and the suspended rotor to rotate at a set speed; the torsional elastic member connected to the suspended rotor undergoes torsional deformation, so that a rotational phase difference is generated between the suspended rotor and the reference rotor;

[0024] S3, the distance measuring sensor is a magnetic sensor, the first magnetic element is a first magnet block, the second magnetic element is a second magnet block, the magnetic sensor measures the change in the magnetic field caused by the rotation of the first magnet block and the second magnet block, and when the two magnet blocks are closest to the magnetic sensor, the maximum magnetic field strength value output by the magnetic sensor is recorded respectively: the first magnet block B1(n) and the second magnet block B2(n), and the time when the maximum magnetic field strength value of the magnetic sensor appears: the first magnet block T1(n) and the second magnet block T2(n), where n is an integer greater than 0;

[0025] S4, calculating the period of the maximum magnetic field strength value of the second magnet block: T2(n+1)-T2(n), and obtaining the viscosity measurement speed 1 / (T2(n+1)-T2(n));

[0026] After calibration, S5 and B1(n) can be used to measure the axial displacement of the suspended rotor and then measure the density of the liquid being measured;

[0027] S6, calculate T2(n)-T1(n) to obtain the phase difference between the suspended rotor and the reference rotor. This phase difference can be used to calculate the viscosity of the measured liquid through calibration fitting and corrected with the density value;

[0028] S7. Measure the temperature P of the measured liquid and perform temperature compensation on the calculated viscosity and density values.

[0029] Another measurement method using the above-mentioned suspension viscosity density online measurement device comprises the following steps:

[0030] S1. Select and configure an appropriate counterweight according to the density range of the measured liquid, and install it under the frustum of the suspended rotor, so that the suspended rotor can be suspended in the measured liquid and the upper end of its cylindrical shell is higher than the upper surface of the measured liquid;

[0031] S2, the measured liquid enters the cavity from the inlet and reaches the height of the outlet position, the suspended rotor moves upward under the buoyancy of the measured liquid to achieve suspension, and the rotating part drives the reference rotor and the suspended rotor to rotate at a set speed; the torsional elastic member connected to the suspended rotor undergoes torsional deformation, so that a rotational phase difference is generated between the suspended rotor and the reference rotor;

[0032] S3, the distance sensor is an optical distance sensor, the reference rotor is a narrow strip, and when the radial protrusion in the middle of the support and the reference rotor rotate to the bottom of the optical distance sensor, the output of the optical distance sensor (63) will correspond to two distance peaks, wherein the distance peak corresponding to the radial protrusion is H1(n), and the peak time is T1(n); the distance peak corresponding to the reference rotor is H2(n), and the peak time is T2(n), wherein n is an integer greater than 0;

[0033] S4. Calculate T2(n+1)-T2(n) to obtain the viscosity measurement speed 1 / (T2(n+1)-T2(n))

[0034] After calibration, S5 and H1(n) can be used to measure the axial displacement of the suspended rotor and then measure the density of the liquid being measured;

[0035] S6, calculate T2(n)-T1(n), obtain the phase difference between the suspended rotor and the reference rotor, and this phase difference can be used to calculate the viscosity of the measured liquid through calibration fitting, and corrected with the density value;

[0036] S7. Measure the temperature P of the measured liquid and perform temperature compensation on the calculated viscosity and density values.

[0037] The beneficial effects of the above two methods are: the density, temperature and viscosity of the measured liquid are measured simultaneously, and the viscosity value is corrected by the density value and the temperature value, so that the accurate viscosity value of the measured liquid can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of a suspension viscosity density online measurement device according to a first embodiment of the present invention;

[0039] Figure 2 Schematic diagram of a suspension viscosity density online measurement device according to a second embodiment of the present invention;

[0040] Figure 3 for Figure 2 A schematic diagram of the suspended rotor shown;

[0041] Figure 4 for Figure 3 A schematic cross-sectional view of the suspended rotor shown;

[0042] Cavity 1, upper cover 11, sealing ring 12, liquid inlet 13, liquid outlet 14;

[0043] Rotating part 2, rotating shaft 20, first motor 21, outer driving magnet 22, inner driving magnet 23, rotating shaft seat 24, stepping motor 25, shaft sleeve 26;

[0044] Reference rotor 3;

[0045] Suspended rotor 4, suspended body 40, cylindrical shell 401, truncated cone 402, lower stud 403, radial through hole 404, support member 41, lower connecting end 410, radial threaded hole 411, positioning shoulder 412, counterweight 42, radial threaded member 43, suspended detection end 44; torsional elastic member 5,

[0046] Distance measuring sensor 6, first magnetic member 61, second magnetic member 62, optical distance measuring sensor 63, radial protrusion 64;

[0047] Measurement and control unit 7; temperature sensor 8. DETAILED DESCRIPTION

[0048] The present invention will be further described in detail below with reference to the accompanying drawings. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0049] Figures 1 to 4 A suspension viscosity density online measuring device according to an embodiment of the present invention is schematically shown. As shown in the figure, the suspension viscosity density online measuring device comprises: a cavity 1, a rotating part 2, a reference rotor 3, a suspension rotor 4, a torsional elastic member 5 and a distance sensor 6;

[0050] The cavity 1 can allow the measured liquid to flow through. Preferably, the cavity 1 is provided with a liquid inlet 13 and a liquid outlet 14, the height of the liquid inlet 13 is lower than the height of the liquid outlet 14, and the height of the reference rotor 3 is higher than the height of the liquid outlet 14.

[0051] The rotating part 2 is fixedly connected to the cavity 1, wherein the vertical rotating shaft 20 of the rotating part 2 is coaxially preferably arranged directly above the suspension rotor 4;

[0052] The reference rotor 3 is fixedly connected to the outer wall of the rotating shaft 20. The reference rotor 3 is preferably a narrow metal strip. The reference rotor 3 is higher than the liquid level of the measured liquid. The reference rotor 3 rotates synchronously with the rotating shaft 20.

[0053] A suspension detection end 44 is provided at the upper end of the hollow suspension body 40 inside the suspension rotor 4. The upper end of the suspension body 40 is connected to the rotating shaft 20 through a torsion elastic member 5, so that the suspension body 40 is suspended in the liquid to be measured and the suspension detection end 44 is exposed to the liquid to be measured. The suspension rotor 4 is driven to rotate by the rotating shaft 20. The suspension body 40 is preferably configured as a cylinder or a sphere; preferably, the torsion elastic member 5 is a spiral spring hairspring, the outer part of which is installed on the inner side of the support member 41 and the inner part of which is installed on the rotating shaft 20 through a sleeve 26.

[0054] The distance sensor 6 is fixedly connected in the cavity 1. The distance sensor 6 can also be preferably a magnetic sensor or an optical distance sensor. The distance sensor 6 measures the rotation speed of the reference rotor 3, the axial displacement of the suspension detection end 44, and the phase difference between the reference rotor 3 and the suspension rotor 4 to calculate the viscosity and density of the liquid to be measured.

[0055] The suspension type viscosity and density online measuring device obtains the liquid density by the axial displacement of the suspension detection end 44, obtains the liquid viscosity by measuring the phase difference change of the suspension rotor relative to the reference rotor, and corrects the viscosity by the density value, so as to accurately obtain the viscosity and density of the liquid. The beneficial effects are as follows: firstly, the device adopts a suspension rotor structure, the suspension rotor can be independently suspended in the measured liquid, and remain stable during the rotation process, the suspension rotor and the rotating part are only connected by the torsion elastic member 5, so the viscosity and density measurement is not affected by the friction of other structures and the blockage of debris, the structure is simple, there are fewer interference factors during measurement, there is no sealing problem, and the measurement accuracy is greatly improved; secondly, the device can measure the density and viscosity of the liquid in real time, and the viscosity value can be corrected by the density, effectively eliminating the interference of the measured liquid density change on the measured viscosity; thirdly, due to the use of the suspension rotor, the long-term downward gravity of the rotor can avoid the tensile deformation of the torsion elastic member 5, thereby improving the service life and measurement accuracy of the measuring device; fourthly, the distance sensor 6 is used to simultaneously measure the rotation parameters of the reference suspension rotor and the reference rotor, the structure is simple, the reliability is high, and it can be applied to different measurement environments with and without magnetic field interference.

[0056] Furthermore, it also includes a measurement and control unit 7, which is located outside the cavity 1 and is electrically connected to the distance sensor 6 and the rotating part 2; the measurement and control unit 7 calculates the viscosity and density of the liquid to be measured based on the measurement data of the distance sensor 6. The beneficial effect is that the measurement and control unit 7 obtains real-time parameters and adjusts the measurement parameters, and can realize automatic measurement.

[0057] Preferably, a temperature sensor 8 electrically connected to the measurement and control unit 7 is also included, and the temperature sensor 8 is installed inside the cavity 1 and in contact with the measured liquid. Its beneficial effect is that the real-time temperature of the liquid can be obtained, and the temperature compensation of the liquid viscosity and density calculation is performed through the measurement and control unit 7 to obtain accurate measurement results.

[0058] Further, the suspension rotor 4 is a metal thin-walled inverted cone shell, and the suspension rotor 4 includes a suspension body 40 with a hollow interior, a support member 41, and a counterweight 42. The upper end of the suspension body 40 is a cylindrical shell 401 and a truncated cone 402 with a cone tip facing downward at the lower end. The lower stud 403 integrally arranged on the lower surface of the truncated cone 402 can be detachably connected to the threaded hole of the counterweight 42. The support member 41 is a circular member and its circumferential wall and the upper end of the cylindrical shell 401 are detachably connected through a circumferential thread connection or through a plurality of circumferential arrays of radial screw members 43. Its beneficial effects are: first, a detachable counterweight 42 is arranged at the bottom of the suspension rotor 4, which not only ensures the suspension stability of the suspension rotor 4, but also can adjust the mass of the counterweight 42 to be applied to the density measurement of liquids in different density ranges; second, the counterweight 42 is connected by a vertical screw member 43, and the replacement is quick and convenient; third, the support member 41 is arranged, so that the suspension body 41 can maintain its shape and size, and there is no deformation in long-term measurement.

[0059] Preferably, the truncated cone 402 is a truncated cone shell, the upper end of which is open and the lower end is integrally sealed and connected via a circular cover plate; the upper end circular wall of the truncated cone 402 and the lower end circular wall of the cylindrical shell 401 have the same diameter and are welded into one.

[0060] Preferably, a positioning shoulder 412 is provided at the lower end of the support member 41, and the lower connecting end 410 of the support member 41 is sleeved with an equal diameter shaft on the inner wall of the cylindrical shell 401, and the positioning shoulder 412 of the support member 41 is closely connected to the upper wall of the cylindrical shell 401, and the lower connecting end 410 is provided with a circumferential array of radial threaded holes 411, and the upper end of the cylindrical shell 401 is provided with a plurality of radial through holes 404 in a circumferential array, and the radial threaded member passes through the radial through hole 404 and is threadedly connected to the radial threaded hole 411. The beneficial effect is that the positioning shoulder 412 and the lower connecting end 410 can improve the installation accuracy, which is beneficial to the realization of accurate viscosity measurement.

[0061] Preferably, a positioning shoulder 412 is provided at the lower end of the support member 41, the lower connecting end 410 of the support member 41 is sleeved with an equal diameter shaft on the inner wall of the cylindrical shell 401, the positioning shoulder 412 of the support member 41 is fitted and connected to the upper wall of the cylindrical shell 401, the outer wall of the lower connecting end 410 is provided with a circumferential external thread, and the inner wall of the upper end of the cylindrical shell 401 is provided with a circumferential internal thread, and the two are connected into one by rotation. Its beneficial effect is that the connection structure is simple and easy to install.

[0062] In the first embodiment, the rotating part 2 includes a first motor 21, an outer driving magnet 22, an inner driving magnet 23, a rotating shaft seat 24 and a rotating shaft 20;

[0063] The shaft seat 24 is fixedly connected to the upper wall of the cavity 1, and the middle of the shaft 20 is rotatably connected to the shaft seat 24. The upper end of the shaft 20 is installed with an inner driving magnet 23, and the inner driving magnet 23 is directly opposite to the outer driving magnet 22 outside the cavity 1. The outer driving magnet 22 is installed on the motor shaft of the first motor 21.

[0064] In the second embodiment, the rotating part 2 includes a stepper motor 25 and a rotating shaft 20. The motor shaft of the stepper motor 25 is the rotating shaft 20. The stepper motor 25 is fixed outside the upper cover 11 of the cavity 10. The upper end of the rotating shaft 20 passes through the upper through hole of the upper cover 11. A sealing ring 12 is arranged in the upper through hole to connect the rotating shaft 20 to the shaft sleeve.

[0065] In the above two embodiments, the distance sensor 6 can preferably be at least one optical distance sensor 63, the support member 41 is a circular ring member, and the suspension detection end 44 is a radial protrusion 64 in the middle of the support member 41, so that the upper optical distance sensor 63 can measure the phase change of the suspension rotor 4.

[0066] The distance sensor 6 can also be preferably at least one magnetic sensor, the suspension detection end 44 is a first magnetic member 61 arranged on the support member 41, and the reference rotor 3 is equipped with a second magnetic member 62, which is used for the magnetic distance sensor to measure the rotation speed, axial displacement and phase difference between the reference rotor and the suspension rotor of the suspension rotor. The beneficial effect is that the magnetic sensor or the optical distance sensor is used to simultaneously measure the rotation parameters of the reference suspension rotor and the reference rotor, the structure is simple, the reliability is high, and it can be applied to different measurement environments with and without magnetic field interference.

[0067] Preferably, in an application scenario requiring high-precision measurement, in order to increase the measurement accuracy, the suspended rotor 4 and the reference rotor 3 each require an optical distance measuring sensor 63 for separate measurement or a magnetic sensor for separate measurement.

[0068] A measurement method using the above-mentioned suspension viscosity density online measurement device comprises the following steps:

[0069] S1. According to the density range of the measured liquid, a suitable counterweight 42 is selected and installed under the truncated cone 402 of the suspension rotor 4, so that the suspension rotor 4 can be suspended in the measured liquid and the upper end of the cylindrical shell 401 is higher than the upper surface of the measured liquid;

[0070] S2, the measured liquid enters the cavity from the inlet and reaches the height of the outlet position, the suspended rotor 4 moves upward under the buoyancy of the measured liquid to achieve suspension, and the rotating part 2 drives the reference rotor 3 and the suspended rotor 4 to rotate at a set speed; the torsional elastic member 5 connected to the suspended rotor 4 undergoes torsional deformation, so that a rotational phase difference is generated between the suspended rotor 4 and the reference rotor 3;

[0071] S3, the distance measuring sensor 6 is a magnetic sensor, the first magnetic member 61 is a first magnet block, the second magnetic member 62 is a second magnet block, the magnetic sensor measures the magnetic field change caused by the rotation of the first magnet block and the second magnet block, and when the two magnet blocks are closest to the magnetic sensor, the maximum magnetic field strength value output by the magnetic sensor is recorded respectively: the first magnet block B1(n) and the second magnet block B2(n), and the time when the maximum magnetic field strength value of the magnetic sensor appears: the first magnet block T1(n) and the second magnet block T2(n), where n is an integer greater than 0;

[0072] S4, calculating the period of the maximum magnetic field strength value of the second magnet block: T2(n+1)-T2(n), and obtaining the viscosity measurement speed 1 / (T2(n+1)-T2(n));

[0073] S5 and B1(n) can be used to measure the axial displacement of the suspended rotor 4 after calibration, and then measure the density of the measured liquid; wherein, when the density of the liquid changes, the depth of the suspended rotor immersed in the liquid will change (because the buoyancy of the liquid is the same as the weight of the suspended rotor). Since the position of the liquid outlet is fixed, the height of the liquid level in the cavity is consistent, so the different depths of the suspended rotor immersed in the liquid will cause it to be exposed at different heights above the liquid surface, thus causing axial displacement. Liquids of different densities are injected into the cavity, the axial position values ​​are measured, and the curve relationship between liquids of different densities and the axial position is fitted. When the axial displacement value of the unknown density is measured, the density value can be calculated through the fitted curve relationship.

[0074] S6. Calculate T2(n)-T1(n) to obtain the phase difference between the suspended rotor 4 and the reference rotor 3. This phase difference can be used to calculate the viscosity of the measured liquid through calibration fitting and corrected with the density value. Preferably, for most liquids, this phase difference is linearly related to the viscosity value of the measured liquid, that is, viscosity=k*(T2(n)-T1(n))+c (k and c are constants). Therefore, the viscosity of the measured liquid can be calculated through calibration fitting and corrected with the density value.

[0075] S7, measuring the temperature P of the measured liquid, and performing temperature compensation on the calculated viscosity and density values. Another measurement method of the above-mentioned suspension type viscosity and density online measurement device comprises the following steps:

[0076] S1. According to the density range of the measured liquid, a suitable counterweight 42 is selected and installed under the truncated cone 402 of the suspension rotor 4, so that the suspension rotor 4 can be suspended in the measured liquid and the upper end of the cylindrical shell 401 is higher than the upper surface of the measured liquid;

[0077] S2, the measured liquid enters the cavity from the inlet and reaches the height of the outlet position, the suspended rotor 4 moves upward under the buoyancy of the measured liquid to achieve suspension, and the rotating part 2 drives the reference rotor 3 and the suspended rotor 4 to rotate at a set speed; the torsional elastic member 5 connected to the suspended rotor 4 undergoes torsional deformation, so that a rotational phase difference is generated between the suspended rotor 4 and the reference rotor 3;

[0078] S3, the distance sensor 6 is an optical distance sensor 63, the reference rotor 3 is a narrow strip, and when the radial protrusion 64 in the middle of the support 41 and the reference rotor 3 are rotated to the bottom of the optical distance sensor 63, the output of the optical distance sensor 63 will correspond to two distance peaks, where the distance peak corresponding to the radial protrusion 64 is H1(n), and the peak time is T1(n); the peak corresponding to the reference rotor 3 is H2(n), and the peak time is T2(n), where n is an integer greater than 0;

[0079] S4. Calculate T2(n+1)-T2(n) to obtain the viscosity measurement speed 1 / (T2(n+1)-T2(n))

[0080] S5 and H1(n) can be calibrated to measure the axial displacement of the suspended rotor 4, and then measure the density of the measured liquid; wherein, when the density of the liquid changes, the depth of the suspended rotor immersed in the liquid will change (because the buoyancy of the liquid is the same as the weight of the suspended rotor). Since the position of the liquid outlet is fixed, the height of the liquid level in the cavity is consistent, so the different depths of the suspended rotor immersed in the liquid will cause it to be exposed at different heights above the liquid surface, thus causing axial displacement. Liquids of different densities are injected into the cavity, the axial position values ​​are measured, and the curve relationship between liquids of different densities and axial position values ​​is fitted. When the axial displacement value of the unknown density is measured, the density value can be calculated through the fitted curve relationship.

[0081] S6. Calculate T2(n)-T1(n) to obtain the phase difference between the suspended rotor 4 and the reference rotor 3. This phase difference can be used to calculate the viscosity of the measured liquid through calibration fitting, and corrected with the density value; preferably, for most liquids, this phase difference is linearly related to the viscosity value of the measured liquid, that is, viscosity=k*(T2(n)-T1(n))+c (k and c are constants), so the viscosity of the measured liquid can be calculated through calibration fitting, and corrected with the density value.

[0082] S7. Measure the temperature P of the measured liquid and perform temperature compensation on the calculated viscosity and density values.

[0083] The beneficial effect of the above method is that it can simultaneously measure the density, temperature and viscosity of the measured liquid, and use the density value and temperature value to correct the viscosity value, so as to obtain the accurate viscosity value of the measured liquid.

[0084] Preferably, in the above two methods, temperature compensation is usually performed by fitting experimental data. For example, by measuring the difference in readings of the same viscosity liquid at different temperatures, a curve relationship between temperature and liquid viscosity and density can be fitted, and then the measured system temperature is brought into the curve relationship to remove the temperature characteristics of the system itself.

[0085] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A suspension viscosity density online measuring device, It is characterized in that include: A cavity (1), a rotating part (2), a reference rotor (3), a suspended rotor (4), a torsion elastic member (5) and a distance measuring sensor (6); the cavity (1) is capable of allowing a liquid to flow through; The rotating part (2) is fixedly connected to the cavity (1); The reference rotor (3) is fixedly connected to the outer wall of the rotating shaft (20), the reference rotor (3) is higher than the liquid level of the measured liquid, and the reference rotor (3) rotates synchronously with the rotating shaft (20); The upper end of the hollow suspension body (40) inside the suspension rotor (4) is provided with a suspension detection end (44), and the upper end of the suspension body (40) is connected to the rotating shaft (20) through a torsion elastic member (5), so that the suspension body (40) is suspended in the liquid to be measured and the suspension detection end (44) is exposed to the liquid to be measured, and the suspension rotor (4) is driven to rotate by the rotating shaft (20); The distance measuring sensor (6) is fixedly connected in the cavity (1), and measures the rotation speed of the reference rotor (3), the axial displacement of the suspension detection end (44), and the phase difference between the reference rotor (3) and the suspension rotor (4), so as to calculate the viscosity and density of the liquid to be measured.

2. The suspension viscosity density online measuring device according to claim 1, It is characterized in that A measurement and control unit (7) arranged outside the cavity (1) is electrically connected to the distance measuring sensor (6) and the rotating part (2); Or it may also include a temperature sensor (8) electrically connected to the measurement and control unit (7), wherein the temperature sensor (8) is installed inside the cavity (1) and in contact with the liquid to be measured.

3. The suspension viscosity density online measuring device according to claim 1, It is characterized in that The suspension rotor (4) is a metal thin-walled inverted conical shell, comprising a suspension body (40) with a hollow interior, a cylindrical shell (401) at the upper end and a truncated cone (402) with a cone tip facing downward at the lower end, a lower stud (403) of the truncated cone (402) being detachably connected to a counterweight (42), and a support member (41) and a cylindrical shell (401) being detachably connected via a threaded connection or a plurality of radial threaded members (43) in a circumferential array.

4. The suspension viscosity density online measuring device according to claim 3, It is characterized in that The lower connecting end (410) of the support member (41) is equidiametrically sleeved on the inner wall of the cylindrical shell (401), the positioning shoulder (412) of the support member (41) is fitted and connected to the upper wall of the cylindrical shell (401), and the lower connecting end (410) and the cylindrical shell (401) are connected via a circumferential thread or a radial thread member (43).

5. The suspension viscosity density online measuring device according to claim 1, It is characterized in that The rotating part (2) comprises a first motor (21), an external driving magnet (22), an internal driving magnet (23), a rotating shaft seat (24) and the rotating shaft (20); the rotating shaft seat (24) is fixedly connected to the upper wall of the cavity (1); the middle of the rotating shaft (20) is rotatably connected to the rotating shaft seat (24); the upper end of the rotating shaft (20) is equipped with an internal driving magnet (23); the internal driving magnet (23) is directly opposite to the external driving magnet (22) outside the cavity (1); and the external driving magnet (22) is installed on the motor shaft of the first motor (21); Or the rotating part (2) includes a stepper motor (25) and the rotating shaft (20), the motor shaft of the stepper motor (25) is the rotating shaft (20), the stepper motor (25) is fixed outside the upper cover (11) of the cavity (10), and the middle shaft sleeve of the rotating shaft (20) is a sealing ring (12) in the upper through hole of the upper cover (11).

6. The suspension viscosity density online measuring device according to claim 3, It is characterized in that The torsion elastic member (5) is a spiral spring hairspring, the outer portion of the hairspring is mounted on the inner side of the support member (41) and the inner portion is mounted on the rotating shaft (20) via a shaft sleeve (26); Alternatively, the reference rotor (3) is a narrow metal strip.

7. The suspension viscosity density online measuring device according to claim 1, It is characterized in that The cavity (1) is provided with a liquid inlet (13) and a liquid outlet (14); the height of the liquid inlet (13) is lower than the height of the liquid outlet (14); and the height of the reference rotor (3) is higher than the height of the liquid outlet (14).

8. The suspension viscosity density online measuring device according to claim 3, It is characterized in that The distance measuring sensor (6) is at least one optical distance measuring sensor (63), the support member (41) is a circular ring member, and the suspension detection end (44) is a radial protrusion (64) in the middle of the support member (41); Or the distance measuring sensor (6) is at least one magnetic sensor, the suspension detection end (44) is a first magnetic member (61) arranged on the support member (41), and the reference rotor (3) is equipped with a second magnetic member (62).

9. A measurement method using the suspension viscosity density online measurement device according to claim 8, It is characterized in that The following steps are involved: S1. Select and configure an appropriate counterweight (42) according to the density range of the measured liquid, and install it under the truncated cone (402) of the suspension rotor (4), so that the suspension rotor (4) can be suspended in the measured liquid and the upper end of its cylindrical shell (401) is higher than the upper surface of the measured liquid; S2, the liquid to be measured enters the cavity from the inlet and reaches the height of the outlet position, the suspended rotor (4) moves upward under the buoyancy of the liquid to be measured to achieve suspension, and the rotating part (2) drives the reference rotor (3) and the suspended rotor (4) to rotate at a set speed; the torsion elastic member (5) connected to the suspended rotor (4) undergoes torsion deformation, so that a rotational phase difference is generated between the suspended rotor (4) and the reference rotor (3); S3, the distance measuring sensor (6) is a magnetic sensor, the first magnetic member (61) is a first magnet block, the second magnetic member (62) is a second magnet block, the magnetic sensor measures the change in magnetic field caused by the rotation of the first magnet block and the second magnet block, and when the two magnet blocks are closest to the magnetic sensor, the maximum magnetic field intensity value output by the magnetic sensor is recorded respectively: the first magnet block B1(n) and the second magnet block B2(n), and the time when the maximum magnetic field intensity value of the magnetic sensor appears: the first magnet block T1(n) and the second magnet block T2(n), wherein n is an integer greater than 0; S4, calculating the period of the maximum magnetic field strength value of the second magnet block: T2(n+1)-T2(n), and obtaining the viscosity measurement speed 1 / (T2(n+1)-T2(n)); After calibration, S5 and B1(n) can be used to measure the axial displacement of the suspended rotor (4), and then measure the density of the measured liquid; S6, calculate T2(n)-T1(n), and obtain the phase difference between the suspended rotor (4) and the reference rotor (3). This phase difference can be used to calculate the viscosity of the measured liquid through calibration fitting, and corrected with the density value; S7. Measure the temperature P of the measured liquid and perform temperature compensation on the calculated viscosity and density values.

10. A measurement method using the suspension viscosity density online measurement device according to claim 8, It is characterized in that The following steps are involved: S1. Select and configure an appropriate counterweight (42) according to the density range of the measured liquid, and install it under the truncated cone (402) of the suspension rotor (4), so that the suspension rotor (4) can be suspended in the measured liquid and the upper end of its cylindrical shell (401) is higher than the upper surface of the measured liquid; S2, the liquid to be measured enters the cavity from the inlet and reaches the height of the outlet position, the suspended rotor (4) moves upward under the buoyancy of the liquid to be measured to achieve suspension, and the rotating part (2) drives the reference rotor (3) and the suspended rotor (4) to rotate at a set speed; the torsion elastic member (5) connected to the suspended rotor (4) undergoes torsion deformation, so that a rotational phase difference is generated between the suspended rotor (4) and the reference rotor (3); S3, the distance sensor (6) is an optical distance sensor (63), the reference rotor (3) is a narrow strip, and when the radial protrusion (64) in the middle of the support (41) and the reference rotor (3) are rotated to the position directly below the optical distance sensor (63), the output of the optical distance sensor (63) will correspond to two distance peaks, wherein the distance peak corresponding to the radial protrusion (64) is H1(n), and the peak time is T1(n); the distance peak corresponding to the reference rotor (3) is H2(n), and the peak time is T2(n), wherein n is an integer greater than 0; S4. Calculate T2(n+1)-T2(n) to obtain the viscosity measurement speed 1 / (T2(n+1)-T2(n)) After calibration, S5 and H1(n) can be used to measure the axial displacement of the suspended rotor (4), and then measure the density of the measured liquid; S6, calculating T2(n)-T1(n) to obtain the phase difference between the suspended rotor (4) and the reference rotor (3), the phase difference can be used to calculate the viscosity of the measured liquid through calibration fitting, and corrected with the density value; S7. Measure the temperature P of the measured liquid and perform temperature compensation on the calculated viscosity and density values.

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