A suspended type viscosity density on-line measuring device and method

Abstract

The application discloses a kind of suspension viscosity density on-line measuring device and method.The device includes cavity, rotating part, reference rotor, suspension rotor, torsional spring and distance measuring sensor;Rotating part is fixedly connected on cavity;Reference rotor is fixedly connected on the outer wall of rotating shaft and moves synchronously with rotating shaft, reference rotor is higher than the liquid level of measured liquid;The upper end of the suspension body of suspension rotor is provided with suspension detection end, the suspension body is connected with rotating shaft by torsional spring, so that the suspension body is suspended in measured liquid and the suspension detection end is exposed outside measured liquid, suspension rotor is driven to rotate by rotating shaft;Distance measuring sensor fixed in cavity measures the rotational speed of reference rotor, the axial displacement of suspension detection end and the phase difference of reference rotor and suspension rotor, to calculate the viscosity and density of measured liquid.The application has the effects of real-time measuring the density and viscosity of liquid, and high measurement accuracy.

Description

Technical Field

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

[0002] There is a huge demand for online measurement and control of fluid viscosity and density in the petrochemical and new energy industries, especially in the rapidly developing lithium battery industry in recent years. The measurement of slurry viscosity in lithium batteries is crucial to the quality of lithium battery products. Rotational viscometers are the most important viscosity measurement device in the industry, but they have several drawbacks: First, rotational viscometers have a complex structure, are susceptible to interference during measurement, and have sealing issues when used for online viscosity measurement, affecting accuracy and making them unsuitable for online viscosity measurement. Second, they cannot simultaneously measure the density of the liquid, making it difficult to eliminate the interference of changes in the density of the liquid being measured on the viscosity measurement. Summary of the Invention

[0003] To address one or more of the above problems, the present invention provides a suspension-type online viscosity density measurement device and method.

[0004] According to one aspect of the present invention, the online suspension viscosity density measuring device includes: a cavity, a rotating part, a reference rotor, a suspension rotor, a torsional elastic element, and a distance measuring sensor; the cavity is capable of allowing the liquid to be measured to flow through its channels.

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

[0006] The reference rotor is fixedly connected to the outer wall of the shaft. The reference rotor is higher than the liquid level of the liquid being measured. The reference rotor rotates synchronously with the shaft.

[0007] The suspended rotor has a suspended body with a suspended detection end at the upper end. The upper end of the suspended body is connected to the rotating shaft through a torsional elastic element, so that the suspended body is suspended in the liquid being tested and the suspended detection end is exposed outside the liquid being tested. The suspended rotor is driven to rotate by the rotating shaft.

[0008] The ranging sensor is fixedly connected inside the cavity. The ranging sensor measures the rotational 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 tested.

[0009] This suspended online viscosity and density measuring device obtains liquid density by measuring the axial displacement of the suspended detection end, and liquid viscosity by measuring the phase difference change of the suspended rotor relative to the reference rotor. The viscosity is then corrected using the density value, thus accurately obtaining the liquid's viscosity and density. Its advantages are: First, the device uses a suspended rotor structure, which can independently suspend in the liquid being measured and remain stable during rotation. The suspended rotor and the rotating part are connected only by a torsional elastic element, so the viscosity and density measurement is not affected by friction or obstruction from other structures. The structure is simple, with fewer interference factors during measurement and no sealing issues, greatly improving measurement accuracy. Second, the device can measure the density and viscosity of the liquid in real time, and the viscosity value can be corrected using density, effectively eliminating the interference of changes in the density of the liquid being measured on the viscosity measurement. Third, the use of a suspended rotor avoids the tensile deformation of the torsional elastic element caused by the long-term downward gravity of the rotor, improving the service life and measurement accuracy of the measuring device. Fourth, the use of a distance sensor to simultaneously measure the rotational parameters of the suspended rotor and the reference rotor results in a simple structure, high reliability, and applicability to different measurement environments with and without magnetic field interference.

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

[0011] It may also include a temperature sensor that is electrically connected to the measurement and control unit, the temperature sensor being installed inside the cavity and in contact with the liquid being measured.

[0012] In some embodiments, the suspended rotor is a thin-walled inverted conical metal shell. The suspended rotor includes a hollow suspended body with a cylindrical shell at the top and a cone-shaped truncated cone at the bottom with the cone tip pointing downwards. The lower stud of the cone is detachably connected to a counterweight. The support and the cylindrical shell are detachably connected by a threaded connection or by a radially threaded connection of several circumferential arrays.

[0013] In some embodiments, the lower end of the support member is fitted with a shaft of equal diameter on the inner wall of the cylindrical shell, the positioning shoulder of the support member is fitted to the upper wall of the cylindrical shell, and the lower 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 channel, the rotating shaft seat is rotatably connected in the middle, the internal driving magnet is installed at the upper end of the rotating shaft, the internal driving magnet is directly opposite the external driving magnet outside the cavity, and the external driving magnet is installed on the motor shaft of the first motor.

[0015] The rotating part may include 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. The rotating shaft is fitted with a sealing ring inside the upper through hole of the upper cover.

[0016] In some embodiments, the torsional elastic element is a helical spring, with the outside of the spring mounted on the inside of the support and the inside mounted on the rotating shaft via a bushing.

[0017] Alternatively, the reference rotor may be a narrow metal strip.

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

[0019] In some embodiments, the ranging sensor is at least one optical ranging sensor, the support is a ring, and the suspension detection end is a radial protrusion in the middle of the support.

[0020] Alternatively, the ranging sensor may be at least one magnetic sensor, the levitation detection end may be a first magnetic element mounted on the support, and the reference rotor may be equipped with a second magnetic element.

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

[0022] S1. Select and configure appropriate counterweights according to the density range of the liquid being measured, and install them under the truncated cone of the suspended rotor so that the suspended rotor can be suspended in the liquid being measured and the upper end of its cylindrical shell is higher than the upper surface of the liquid being measured.

[0023] S2. The liquid to be tested enters the cavity through the inlet and reaches the height of the outlet position. The suspended rotor moves upward under the buoyancy of the liquid to be tested to achieve suspension. The rotating part drives the reference rotor and the suspended rotor to rotate at a set speed. The torsional elastic element connecting the suspended rotor undergoes torsional deformation, which causes a rotational phase difference between the suspended rotor and the reference rotor.

[0024] S3. The ranging sensor is a magnetic sensor. The first magnetic element is a first magnet block, and the second magnetic element is a second magnet block. The magnetic sensor measures the change in magnetic field caused by the rotation of the first and second magnet blocks. 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 magnetic sensor reaches the maximum magnetic field strength value: the first magnet block T1(n) and the second magnet block T2(n), where n is an integer greater than 0.

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

[0026] S5 and B1(n), after calibration, can be used to measure the axial displacement of the suspended rotor, and thus 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 by the density value.

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

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

[0030] S1. Select and configure appropriate counterweights according to the density range of the liquid being measured, and install them under the truncated cone of the suspended rotor so that the suspended rotor can be suspended in the liquid being measured and the upper end of its cylindrical shell is higher than the upper surface of the liquid being measured.

[0031] S2. The liquid to be tested enters the cavity through the inlet and reaches the height of the outlet position. The suspended rotor moves upward under the buoyancy of the liquid to be tested to achieve suspension. The rotating part drives the reference rotor and the suspended rotor to rotate at a set speed. The torsional elastic element connecting the suspended rotor undergoes torsional deformation, which causes a rotational phase difference between the suspended rotor and the reference rotor.

[0032] S3. The ranging sensor is an optical ranging sensor. The reference rotor is a narrow strip. When the radial protrusion in the middle of the support and the reference rotor rotate to directly below the optical ranging sensor, the output of the optical ranging sensor (63) will show two distance peaks. 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), where n is an integer greater than 0.

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

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

[0035] 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 then corrected with the density value.

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

[0037] The advantages of the two methods mentioned above are that they enable the simultaneous measurement of the density, temperature, and viscosity of the liquid being tested, and the viscosity value is corrected using the density and temperature values, thus obtaining an accurate viscosity value for the liquid being tested. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the online suspension viscosity density measuring device according to Embodiment 1 of the present invention;

[0039] Figure 2 This is a schematic diagram of the online suspension viscosity density measuring device according to Embodiment 2 of the present invention;

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

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

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

[0043] Rotating part 2, rotating shaft 20, first motor 21, external drive magnet 22, internal drive magnet 23, rotating shaft seat 24, stepper motor 25, bushing 26;

[0044] Reference rotor 3;

[0045] Suspension rotor 4, suspension body 40, cylindrical shell 401, frustum conical 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 component 43, suspension detection end 44; torsional elastic element 5.

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

[0047] 7. Measurement and control unit; 8. Temperature sensor. Detailed Implementation

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

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

[0050] The cavity 1 allows the liquid to be measured to flow through its channel. Preferably, the cavity 1 is provided with an inlet 13 and an outlet 14, with the height of the inlet 13 being lower than the height of the outlet 14, and the height of the reference rotor 3 being higher than the height of the 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 preferably coaxially arranged directly above the suspended 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 surface of the liquid being measured. The reference rotor 3 rotates synchronously with the rotating shaft 20.

[0053] The suspended rotor 4 has a suspended body 40 with a suspended detection end 44 at the upper end. The upper end of the suspended body 40 is connected to the rotating shaft 20 through a torsional elastic element 5, so that the suspended body 40 is suspended in the liquid to be tested and the suspended detection end 44 is exposed outside the liquid to be tested. The suspended rotor 4 is driven to rotate by the rotating shaft 20. The suspended body 40 is preferably set as a cylinder or a sphere. Preferably, the torsional elastic element 5 is a spiral spring. The outside of the spring is installed inside the support member 41 and the inside is installed on the rotating shaft 20 through the bushing 26.

[0054] The ranging sensor 6 is fixedly connected inside the cavity 1. The ranging sensor 6 can also be preferably a magnetic sensor or an optical ranging sensor. The ranging sensor 6 measures the rotational 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, which are used to calculate the viscosity and density of the liquid to be measured.

[0055] This suspended online viscosity density measuring device obtains liquid density by measuring the axial displacement of the suspended detection end 44, and liquid viscosity by measuring the phase difference change of the suspended rotor relative to the reference rotor. The viscosity is then corrected using the density value, thus accurately obtaining the liquid's viscosity and density. Its advantages are: First, the device uses a suspended rotor structure, which can independently suspend in the liquid being measured and remain stable during rotation. The suspended rotor and the rotating part are connected only by a torsional elastic element 5. Therefore, viscosity density measurement is not affected by friction or obstruction from other structures, resulting in a simple structure, fewer interference factors during measurement, and no sealing issues, greatly improving measurement accuracy. Second, the device can measure the density and viscosity of the liquid in real time, and the viscosity value can be corrected using density, effectively eliminating the interference of changes in the density of the liquid being measured on the viscosity measurement. Third, the use of a suspended rotor avoids the tensile deformation of the torsional elastic element 5 caused by the long-term downward gravity of the rotor, improving the service life and measurement accuracy of the measuring device. Fourth, the use of a distance sensor 6 to simultaneously measure the rotational parameters of the suspended rotor and the reference rotor results in a simple structure, high reliability, and applicability 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 electrically connected to the ranging 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 ranging sensor 6. Its beneficial effect is that the measurement and control unit 7 acquires real-time parameters and adjusts the measurement parameters, enabling automated measurement.

[0057] Preferably, the device also includes a temperature sensor 8 electrically connected to the measurement and control unit 7. The temperature sensor 8 is installed inside the cavity 1 and is in contact with the liquid being measured. Its advantages are: it can acquire the real-time temperature of the liquid, and the measurement and control unit 7 can calculate the liquid viscosity and density to perform temperature compensation, thereby obtaining accurate measurement results.

[0058] Furthermore, the suspended rotor 4 is a thin-walled inverted conical metal shell. The suspended rotor 4 includes a hollow suspended body 40, a support member 41, and a counterweight 42. The upper end of the suspended body 40 is a cylindrical shell 401, and the lower end is a truncated cone 402 with its tip pointing downwards. A stud 403 integrally formed on the lower surface of the truncated cone 402 is detachably connected to the threaded hole of the counterweight 42. The support member 41 is a circular component, and its circumferential wall is detachably connected to the upper end of the cylindrical shell 401 via a circumferential thread or via a radially threaded component 43 arranged in a circumferential array. Its advantages are: firstly, the detachable counterweight 42 at the bottom of the suspended rotor 4 not only ensures the suspension stability of the suspended rotor 4 but also allows adjustment of the mass of the counterweight 42 for density measurement of liquids with different density ranges; secondly, the counterweight 42 is connected by vertically threaded components 43, making replacement quick and convenient; thirdly, the support member 41 ensures that the suspended body 41 maintains its shape and size, preventing deformation during long-term measurement.

[0059] Preferably, the truncated cone 402 is a frustum shell with an open upper end and an integrally sealed lower end by a circular cover plate; the upper annular wall of the truncated cone 402 and the lower annular wall of the cylindrical shell 401 have the same diameter and are welded together.

[0060] Preferably, the lower end of the support member 41 is provided with a positioning shoulder 412, the lower connecting end 410 of the support member 41 is sleeved on the inner wall of the cylindrical shell 401 with a constant diameter, the positioning shoulder 412 of the support member 41 is fitted to the upper wall of the cylindrical shell 401, 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. The radial threaded parts pass through the radial through holes 404 and are threaded to the radial threaded holes 411. The beneficial effects are: the positioning shoulder 412 and the lower connecting end 410 can improve the installation accuracy and are beneficial to the accurate measurement of viscosity.

[0061] Preferably, the lower end of the support member 41 is provided with a positioning shoulder 412, the lower connecting end 410 of the support member 41 is sleeved on the inner wall of the cylindrical shell 401 with a constant diameter, the positioning shoulder 412 of the support member 41 is fitted 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. The two are connected as one unit by rotation. Its advantages are: the connection structure is simple and easy to install.

[0062] In one embodiment, the rotating part 2 includes a first motor 21, an external driving magnet 22, an internal driving magnet 23, a rotating shaft seat 24, and a rotating shaft 20.

[0063] The rotating shaft seat 24 is fixedly connected to the upper wall of the cavity 1. The rotating shaft 20 is rotatably connected to the rotating shaft seat 24 in the middle. The inner drive magnet 23 is installed at the upper end of the rotating shaft 20. The inner drive magnet 23 is directly opposite the outer drive magnet 22 outside the cavity 1. The outer drive 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 provided in the upper through hole to connect the rotating shaft 20.

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

[0066] The ranging sensor 6 can preferably be at least one magnetic sensor. The levitation detection end 44 is a first magnetic element 61 mounted on the support member 41, and the reference rotor 3 is equipped with a second magnetic element 62. This is used by the magnetic ranging sensor to measure the rotational speed, axial displacement, and phase difference between the reference rotor and the levitation rotor. Its advantages are: using a magnetic sensor or an optical ranging sensor to simultaneously measure the rotational parameters of both the levitation rotor and the reference rotor; simple structure; high reliability; and applicability to different measurement environments, both with and without magnetic field interference.

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

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

[0069] S1. Select and configure an appropriate counterweight 42 according to the density range of the liquid being measured, and install it under the truncated cone 402 of the suspended rotor 4, so that the suspended rotor 4 can be suspended in the liquid being measured and the upper end of its cylindrical shell 401 is higher than the upper surface of the liquid being measured.

[0070] S2. The liquid to be tested enters the cavity through the inlet and reaches the height of the outlet position. The suspended rotor 4 moves upward under the buoyancy of the liquid to be tested to achieve suspension. The rotating part 2 drives the reference rotor 3 and the suspended rotor 4 to rotate at a set speed. The torsional elastic element 5 connecting the suspended rotor 4 undergoes torsional deformation, which causes a rotational phase difference between the suspended rotor 4 and the reference rotor 3.

[0071] S3. The ranging sensor 6 is a magnetic sensor. The first magnetic element 61 is the first magnet block, and the second magnetic element 62 is the second magnet block. The magnetic sensor measures the magnetic field change caused by the rotation of the first and second magnet blocks. 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 magnetic sensor reaches the maximum magnetic field strength value: the first magnet block T1(n) and the second magnet block T2(n), where n is an integer greater than 0.

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

[0073] S5 and B1(n), after calibration, can be used to measure the axial displacement of the suspended rotor 4, and thus the density of the liquid being measured. When the liquid density changes, the depth to which the suspended rotor is immersed in the liquid changes (because the buoyancy of the liquid and the weight of the suspended rotor are the same). Since the outlet position is fixed, the liquid level in the cavity is uniform. Therefore, different immersion depths of the suspended rotor will result in different heights above the liquid surface, thus producing axial displacement. By injecting liquids of different densities into the cavity and measuring the axial position values, a curve relationship between different liquid densities and axial position is fitted. When the axial displacement value of an unknown density is measured, the density value can be calculated using 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 liquid being measured through calibration fitting and then corrected with the density value. Preferably, for most liquids, this phase difference is linearly related to the viscosity value of the liquid being measured, i.e., viscosity = k*(T2(n)-T1(n))+c (k and c are constants). Therefore, the viscosity of the liquid being measured can be calculated through calibration fitting and then corrected with the density value.

[0075] S7. Measure the temperature P of the liquid being measured, and perform temperature compensation on the calculated viscosity and density values. Another measurement method using the above-mentioned online viscosity-density measurement device includes the following steps:

[0076] S1. Select and configure an appropriate counterweight 42 according to the density range of the liquid being measured, and install it under the truncated cone 402 of the suspended rotor 4, so that the suspended rotor 4 can be suspended in the liquid being measured and the upper end of its cylindrical shell 401 is higher than the upper surface of the liquid being measured.

[0077] S2. The liquid to be tested enters the cavity through the inlet and reaches the height of the outlet position. The suspended rotor 4 moves upward under the buoyancy of the liquid to be tested to achieve suspension. The rotating part 2 drives the reference rotor 3 and the suspended rotor 4 to rotate at a set speed. The torsional elastic element 5 connecting the suspended rotor 4 undergoes torsional deformation, which causes a rotational phase difference between the suspended rotor 4 and the reference rotor 3.

[0078] S3, the ranging sensor 6 is an optical ranging sensor 63, the reference rotor 3 is a narrow strip, when the radial protrusion 64 in the middle of the support member 41 and the reference rotor 3 rotate to be directly below the optical ranging sensor 63, the output of the optical ranging sensor 63 will show 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 rotation speed 1 / (T2(n+1)-T2(n)).

[0080] S5 and H1(n), after calibration, can be used to measure the axial displacement of the suspended rotor 4, and thus the density of the liquid being measured. When the liquid density changes, the depth to which the suspended rotor is immersed in the liquid changes (because the buoyancy of the liquid and the weight of the suspended rotor are the same). Since the outlet position is fixed, the liquid level in the cavity is uniform. Therefore, different immersion depths of the suspended rotor will result in different heights above the liquid surface, thus producing axial displacement. By injecting liquids of different densities into the cavity and measuring the axial position values, a curve relationship between different liquid densities and axial position values ​​can be fitted. When the axial displacement value of an unknown density is measured, the density value can be calculated using 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 liquid being measured through calibration fitting, and then corrected with the density value. Preferably, for most liquids, this phase difference has a linear relationship with the viscosity value of the liquid being measured, i.e., viscosity = k*(T2(n)-T1(n))+c (k and c are constants). Therefore, the viscosity of the liquid being measured can be calculated through calibration fitting, and then corrected with the density value.

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

[0083] The beneficial effects of the above method are: it enables the simultaneous measurement of the density, temperature and viscosity of the liquid being tested, and the viscosity value is corrected by the density and temperature values, thus obtaining the accurate viscosity value of the liquid being tested.

[0084] Preferably, in the two methods described above, 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. Then, the measured system temperature is substituted into the curve relationship to remove the temperature characteristics of the system itself.

[0085] The above are merely some embodiments of the present invention. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of the present invention, and all such modifications and improvements fall within the scope of protection of the present invention.

Claims

1. A suspended viscosity-density online measuring device, characterized in that, include: The cavity (1), rotating part (2), reference rotor (3), suspension rotor (4), torsional elastic element (5) and distance sensor (6); the cavity (1) is capable of allowing the liquid to be measured to flow through it; 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 surface of the liquid being measured. The reference rotor (3) rotates synchronously with the rotating shaft (20). The suspended rotor (4) has a suspended body (40) with a suspended detection end (44) at the upper end. The suspended body (40) is connected to the rotating shaft (20) through a torsional elastic element (5) at the upper end, so that the suspended body (40) is suspended in the liquid to be tested and the suspended detection end (44) is exposed outside the liquid to be tested. The suspended rotor (4) is driven to rotate by the rotating shaft (20). The ranging sensor (6) is fixedly connected inside the cavity (1). The ranging sensor (6) measures the rotational 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 tested.

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

3. The online suspension viscosity density measuring device according to claim 1, characterized in that, The suspended rotor (4) is a thin-walled inverted conical shell. The suspended rotor (4) includes a hollow suspended body (40) with a cylindrical shell (401) at the upper end and a cone (402) with the cone tip pointing downwards at the lower end. The lower stud (403) of the cone (402) is detachably connected to the counterweight (42). The support (41) and the cylindrical shell (401) are detachably connected by a threaded connection or by a number of radially threaded parts (43) arranged in a circumferential array.

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

5. The online suspension viscosity density measuring device according to claim 1, characterized in that, The rotating part (2) includes 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 rotating shaft (20) is rotatably connected to the rotating shaft seat (24) in the middle, the internal driving magnet (23) is installed at the upper end of the rotating shaft (20), the internal driving magnet (23) is directly opposite 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); Alternatively, the rotating part (2) may include a stepper motor (25) and the rotating shaft (20), wherein 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 intermediate shaft of the rotating shaft (20) is fitted with a sealing ring (12) in the upper through hole of the upper cover (11).

6. The online suspension viscosity density measuring device according to claim 3, characterized in that, The torsional elastic element (5) is a spiral spring, the outside of which is installed inside the support (41) and the inside of which is installed on the rotating shaft (20) through the bushing (26); Alternatively, the reference rotor (3) may be a narrow metal strip.

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

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

9. A measurement method using the online suspension viscosity density measuring device according to claim 8, characterized in that, Includes the following steps: S1. Select and configure an appropriate counterweight (42) according to the density range of the liquid being measured, and install it under the truncated cone (402) of the suspension rotor (4) so ​​that the suspension rotor (4) can be suspended in the liquid being measured and the upper end of its cylindrical shell (401) is higher than the upper surface of the liquid being measured. S2. The liquid to be tested enters the cavity through the inlet and reaches the height of the outlet position. The suspended rotor (4) moves upward under the buoyancy of the liquid to be tested to achieve suspension. The rotating part (2) drives the reference rotor (3) and the suspended rotor (4) to rotate at the set speed. The torsional elastic element (5) connecting the suspended rotor (4) undergoes torsional deformation, which causes a rotational phase difference between the suspended rotor (4) and the reference rotor (3). S3. The ranging sensor (6) is a magnetic sensor. The first magnetic element (61) is a first magnet block, and the second magnetic element (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. 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 magnetic sensor produces the maximum magnetic field strength value: the first magnet block T1(n) and the second magnet block T2(n), where n is an integer greater than 0. S4. Calculate the period of the maximum magnetic field strength of the second magnet block: T2(n+1)-T2(n), and obtain the viscosity measurement rotation speed 1 / (T2(n+1)-T2(n)); S5 and B1(n) can be calibrated to measure the axial displacement of the suspended rotor (4) and thus measure the density of the liquid being measured. 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 liquid being measured by calibration fitting and then corrected by the density value. S7. Measure the temperature P of the liquid being tested, and perform temperature compensation on the calculated viscosity and density values.

10. A measurement method using the online suspension viscosity density measuring device according to claim 8, characterized in that, Includes the following steps: S1. Select and configure an appropriate counterweight (42) according to the density range of the liquid being measured, and install it under the truncated cone (402) of the suspension rotor (4) so ​​that the suspension rotor (4) can be suspended in the liquid being measured and the upper end of its cylindrical shell (401) is higher than the upper surface of the liquid being measured. S2. The liquid to be tested enters the cavity through the inlet and reaches the height of the outlet position. The suspended rotor (4) moves upward under the buoyancy of the liquid to be tested to achieve suspension. The rotating part (2) drives the reference rotor (3) and the suspended rotor (4) to rotate at the set speed. The torsional elastic element (5) connecting the suspended rotor (4) undergoes torsional deformation, which causes a rotational phase difference between the suspended rotor (4) and the reference rotor (3). S3. The ranging sensor (6) is an optical ranging sensor (63). The reference rotor (3) is a narrow strip. When the radial protrusion (64) in the middle of the support (41) and the reference rotor (3) rotate to directly below the optical ranging sensor (63), the output of the optical ranging sensor (63) will show two distance peaks. 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), where n is an integer greater than 0. S4. Calculate T2(n+1)-T2(n) to obtain the viscosity measurement rotation speed 1 / (T2(n+1)-T2(n)). S5 and H1(n) can be calibrated to measure the axial displacement of the suspended rotor (4) and thus measure the density of the liquid being measured. 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 liquid being measured by calibration fitting and then corrected by the density value. S7. Measure the temperature P of the liquid being tested, and perform temperature compensation on the calculated viscosity and density values.

Images