Device and method for on-line measurement of rheological properties of fluid

Abstract

The invention discloses a device and a method for on-line measurement of rheological properties of fluid. The device comprises a first detection unit, a detection cavity, a leveling cavity and a second detection unit, the detection cavity and the leveling cavity are horizontally arranged according to a fluid flowing direction in sequence; a flow guide hole for communicating the detection cavity with the leveling cavity is formed in a vertically connected wall surface between the detection cavity and the leveling cavity; a feeding hole is formed in the detection cavity, an overflowing hole is formed in the bottom of the leveling cavity, and the sectional areas of the feeding hole, the flow guide hole and the overflowing hole are sequentially increased; the lower edge of the flow guide hole is higher than the upper edge of the feeding hole; a measuring hole is formed in the bottom of the detection cavity; the first detection unit is installed on the upper portion of the detection cavity, and the second detection unit is installed on the side wall, opposite to the flow guide hole, of the leveling cavity. The device and the method have the effects of stable detection environment and accurate online measurement of various characteristics of the complex fluid.

Description

Technical Field

[0001] The present invention relates to the field of fluid detection, and in particular to a device and method for online detection of rheological properties of complex fluids such as battery slurries, suspensions, polymer solutions, etc. Background Art

[0002] Complex fluids such as battery slurries, muds, and paints have high viscosities and, due to the influence of their multi-component composition and microstructural forces, exhibit a variety of non-Newtonian fluid properties, such as shear thinning, shear thickening, thixotropy, and viscoelasticity. Industrial production typically uses rheological properties such as viscosity at different shear rates or viscosity measured using different viscosity measurement methods (such as dynamic viscosity and kinematic viscosity) to control the quality and process parameters of complex fluids. However, the currently widely used rotational rheometers are expensive and complex to operate, making them unsuitable for on-site production and online measurement. Furthermore, there are currently no products on the market that can simultaneously measure the dynamic viscosity and kinematic viscosity of a fluid online. Summary of the Invention

[0003] In order to solve one or more of the above problems, the present invention provides an apparatus and method for online measuring rheological properties of a fluid.

[0004] According to one aspect of the present invention, the device for online measuring rheological properties of a fluid comprises: a first detection unit, a detection chamber, a leveling chamber, and a second detection unit;

[0005] The detection chamber and the leveling chamber are arranged in a horizontal order according to the fluid flow direction; the vertically connected wall between the detection chamber and the leveling chamber is provided with a guide hole for connecting the detection chamber and the leveling chamber;

[0006] A feed hole is provided on the detection chamber, and a flow hole is provided at the bottom of the leveling chamber. The cross-sectional areas of the feed hole, the flow guide hole and the flow hole increase in sequence; the lower edge of the flow guide hole is higher than the upper edge of the feed hole, and a measuring hole is also provided at the bottom of the detection chamber;

[0007] The first detection unit is installed on the upper part of the detection cavity, and the second detection unit is installed on the side wall of the leveling cavity opposite to the guide hole.

[0008] In some embodiments, the first detection unit is a dynamic viscosity measuring device;

[0009] The second detection unit is a distance measuring sensor, which is used to measure in real time the thickness of the fluid film formed on the vertically connected wall surface after the fluid flows out of the diversion hole.

[0010] In some embodiments, the dynamic viscosity detection device is any one of a rotational viscometer, a tuning fork vibration sensor, and a torsional viscosity sensor;

[0011] The distance measuring sensor is an ultrasonic sensor or a photoelectric distance measuring sensor.

[0012] In some embodiments, a conical surface is provided at the bottom of the detection cavity, a measuring hole is provided at the center of the conical surface, and a liquid level sensor is provided inside the detection cavity for real-time measurement of the fluid level height in the detection cavity.

[0013] In some embodiments, the liquid level sensor is any one of a capacitive sensor, an ultrasonic sensor, and a photoelectric sensor.

[0014] In some embodiments, a rheological measuring tube is installed on the measuring hole, and a solenoid valve is provided on the rheological measuring tube.

[0015] In some embodiments, a collecting chamber is further included at the bottom of the detection chamber and the leveling chamber. The detection chamber is connected to the collecting chamber through a measuring hole and a rheological measuring tube, and the leveling chamber is connected to the collecting chamber through a flow hole. A discharge hole is provided on the collecting chamber.

[0016] In some embodiments, the guide hole is a flat hole or a slot with a length arranged in the horizontal direction, and the lower edge of the flat hole or the slot has a plane arranged in the horizontal direction.

[0017] The beneficial effects of the device for online measuring fluid rheological properties are:

[0018] First, the dual-cavity design of the detection chamber and the leveling chamber enables simultaneous online measurement of the dynamic viscosity and kinematic viscosity of the measured fluid. Since dynamic viscosity is measured using rotation or vibration methods, while kinematic viscosity measures the flow characteristics of the fluid under the action of its own weight, the two measurements use different forces and shear rates. This structure increases the measurement information of the rheological properties of complex fluids such as battery slurries, coatings, or polymer solutions, improving the accuracy and timeliness of fluid property judgments.

[0019] Secondly, the device can measure the leveling characteristics of the fluid. The fluid slowly enters the leveling chamber from the detection chamber through the guide hole. Because the bottom edge of the guide hole is set as a horizontal plane and the fluid has high viscosity, the fluid flowing through the guide hole spreads along the length of the leveling chamber wall and flows downward, forming a thick fluid film on the surface of the cavity wall. When the measured fluid stops entering the leveling chamber, the fluid film continues to flow downward under the action of gravity, causing the thickness of the fluid film to decrease. The thickness change is measured by the second detection unit installed on the opposite cavity wall, which can effectively measure the slurry leveling characteristics of the fluid.

[0020] Third, the detection chamber and the leveling chamber are connected through a flow guide hole with a specific structure. The cross-sectional area of ​​the flow guide hole is larger than that of the feed hole, and the cross-sectional area of ​​the flow-through hole is larger than that of the flow guide hole. This structural design makes the outflow of the flow guide hole larger than the inflow of the feed hole, thus achieving the leveling of the liquid in the detection chamber, that is, the dynamic stability of the liquid level height in the detection chamber, greatly improving the stability of the detection environment and the accuracy of the detection, while reducing the number of control components, optimizing the operation steps, and simplifying the operation;

[0021] Fourthly, combined with the dual-cavity leveling structure of this device, the measuring hole is opened by controlling the solenoid valve, and a rheological measuring tube of appropriate diameter is selected according to the fluid characteristics. By measuring the time it takes for a certain volume of fluid to flow out of the measuring hole, the kinematic viscosity of the liquid can be converted proportionally, thus achieving the function of a viscosity measuring cup.

[0022] Fifth, the device can be adapted to a variety of different sensors or detection instruments, has strong versatility and wide applicability, and can not only measure the dynamic viscosity, kinematic viscosity and leveling characteristics of the fluid, but also can measure the density, temperature, solid content or pH value of the fluid according to the specific type or structure of the first detection unit as needed.

[0023] According to another aspect of the present invention, a method for online measuring rheological properties of a fluid is provided, wherein the method is used for at least one of dynamic viscosity measurement, kinematic viscosity measurement, and leveling property measurement:

[0024] Dynamic viscosity measurement is performed using any of the above-mentioned devices for online measurement of fluid rheological properties. The specific steps are as follows:

[0025] S1, measurement starts, close the measuring hole;

[0026] S2, the measured fluid enters the detection cavity from the feed hole, and the liquid level gradually rises and flows into the leveling cavity 30 through the guide hole;

[0027] S3. When the liquid level reaches the set value h0, the reading and temperature value of the first detection unit are collected and recorded, and the dynamic viscosity of the fluid is calculated;

[0028] S4. The measured fluid flows out of the leveling cavity through the flow hole, so that the measured fluid in the detection cavity is continuously updated, but the liquid level remains unchanged, and the measurement data of the first detection unit is updated in real time;

[0029] Kinematic viscosity measurement uses an online device for measuring fluid rheological properties with a rheometer tube. The specific steps are as follows:

[0030] S1. Select a rheological measuring tube that matches the viscosity range of the fluid being measured; the greater the viscosity, the larger the tube diameter;

[0031] S2, close the measuring hole; the measured fluid enters the detection cavity from the feed hole, and when the liquid level reaches the set value h0, the feed hole is closed;

[0032] S3, the measuring hole is opened, the timer is started, and the liquid level changes are measured and recorded in real time;

[0033] S4. As the fluid in the detection chamber flows out of the measuring hole, the liquid level continues to decrease. When the liquid level measurement value reaches the set value h1, the measuring hole is closed and the timing is stopped.

[0034] S5. Calculate the kinematic viscosity of the fluid based on the time it takes for the fluid to flow out of the detection chamber and the inner diameter of the rheological measurement tube;

[0035] Leveling properties are measured using any of the above-mentioned devices for online measurement of fluid rheological properties. The specific steps are as follows:

[0036] S1, measurement starts, the measuring hole is closed, and the measured fluid enters the detection cavity through the feed hole;

[0037] S2: When the liquid level reaches the set value h0, the feed hole is closed after a fixed delay, and the timer starts timing;

[0038] S3, the second detection unit measures in real time the thickness of the fluid film formed on the wall surface after the fluid flows out of the guide hole;

[0039] S4. When the thickness of the fluid film being measured remains unchanged, the timing stops, and the initial thickness d0, stable thickness d1 and leveling time of the fluid film are recorded, and compared with the pre-stored control standard to obtain the leveling / film-forming characteristics of the fluid being measured, where the initial thickness d0 of the fluid film is the maximum fluid film thickness measured by the second detection unit 40, and the stable thickness d1 is the fluid film thickness measured when the thickness of the fluid film remains unchanged.

[0040] In the above measurement methods, according to different measured fluids and measurement requirements, one or any combination of the above three measurement methods is selected to form a fluid rheological property detection system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 Schematic cross-sectional view of a device for online measurement of fluid rheological properties according to one embodiment of the present invention;

[0042] Figure 2 for Figure 1 The left side schematic diagram of the detection chamber and the leveling chamber is shown;

[0043] Figure 3 for Figure 1 A schematic top view of the detection cavity and the leveling cavity is shown;

[0044] Figure 4 for Figure 1 AA cross-sectional view of the device shown;

[0045] First detection unit 10, liquid level sensor 13;

[0046] Detection cavity 20, 21 conical surface, guide hole 22, feed hole 23, measurement hole 24, rheological measuring tube 25, solenoid valve 26;

[0047] Leveling cavity 30, flow hole 31;

[0048] a second detection unit 40;

[0049] Manifold 50 , discharge hole 51 . DETAILED DESCRIPTION

[0050] The present invention will be described in further detail below 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, and the terms "inward" and "outward" refer to directions toward or away from the geometric center of a particular component, respectively.

[0051] Figures 1 to 4 A device for online measuring rheological properties of a fluid according to the following embodiment of the present invention is schematically shown.

[0052] As shown in the figure, the device for online measuring the rheological properties of a fluid includes: a first detection unit 10, a detection chamber 20, a leveling chamber 30, and a second detection unit 40;

[0053] The detection chamber 20 and the leveling chamber 30 are arranged in a horizontal order according to the direction of fluid flow; the vertically connected wall between the detection chamber 20 and the leveling chamber 30 is provided with a guide hole 22 for connecting the detection chamber 20 and the leveling chamber 30. The guide hole 22 can be a hole of any shape as long as it facilitates the liquid flow between the detection chamber and the leveling chamber 30. However, in order to improve the leveling effect, the guide hole 22 preferably adopts a hole with a horizontal bottom edge. Furthermore, the guide hole 22 is a flat hole or groove with a length arranged in the horizontal direction, and the lower edge of the flat hole or groove has a plane arranged in the horizontal direction. In this way, the complex fluid flowing through the flow guide hole 22 will spread out on the vertically connected wall between the detection chamber 20 and the leveling chamber 30 and then flow downward, forming a fluid film similar to a coating on the surface of the vertically connected wall. Since the complex fluid has a high viscosity, the initial thickness of the fluid film is relatively large. With the closure of the feed hole 23 of the detection chamber 20, no more fluid flows into the leveling chamber 30. Therefore, the fluid on the vertically connected wall continues to flow downward along the wall under the action of gravity, and the thickness of the fluid film will decrease. Among them, measuring the initial thickness d0 of the fluid film, the film thickness d1 after the fluid is leveled, and the time interval for the film thickness to decrease from d0 to d1 can well characterize the slurry film-forming characteristics of the complex fluid, and the slurry film-forming characteristics of the fluid can be measured by the second detection unit 40.

[0054] More preferably, the flow guide holes 22 are long strips with parallel upper and lower sides, with the long sides arranged vertically and the short sides arranged horizontally. The short sides of the flow guide holes 22 are larger than the diameter of the feed hole 23. The flow guide holes 22 arranged in this structure make the film formation of complex fluids more uniform and stable, and facilitate detection.

[0055] The detection chamber 20 is provided with a feed hole 23, and a flow hole 31 is provided at the bottom of the leveling chamber 30. The cross-sectional areas of the feed hole 23, the flow guide hole 22, and the flow hole 31 increase in order; the lower edge of the flow guide hole 22 is located higher than the upper edge of the feed hole 23. This arrangement ensures that the outflow of the flow guide hole 22 is greater than the inflow of the feed hole 23, achieving fluid leveling within the detection chamber 20. This means that the fluid within the detection chamber 20 is highly stable, facilitating accurate measurement by the detection unit 10.

[0056] A measuring hole 24 is also provided at the bottom of the detection chamber 20. Preferably, a conical surface 21 is provided at the bottom of the detection chamber 20, and a measuring hole 24 is provided at the center of the conical surface 21. A liquid level sensor 13 is provided inside the detection chamber 20 for measuring the fluid level height in the detection chamber 20 in real time. The liquid level sensor 13 is preferably any one of a capacitive sensor, an ultrasonic sensor and a photoelectric sensor. The selected liquid level sensor 13 has excellent detection accuracy. Further preferably, a rheological measuring tube 25 is installed on the measuring hole 24, and an electromagnetic valve 26 is provided on the rheological measuring tube 25. When the electromagnetic valve 26 is opened, the fluid flows out from the measuring hole 24 and the rheological measuring tube 25, and the kinematic viscosity of the fluid is obtained by measuring the time it takes for the fluid to flow out. The working principle is similar to that of the viscosity measuring cup commonly used in the industry. Corresponding to the measured fluids of different viscosities, rheological measuring tubes 25 of different diameters and lengths can be provided to ensure the accuracy and timeliness of the measurement.

[0057] The first detection unit 10 is mounted on the upper portion of the detection chamber 20. The first detection unit 10 is a dynamic viscosity measuring device for measuring the dynamic viscosity of the fluid. The dynamic viscosity measuring device can be, for example, a rotational viscometer, a tuning fork vibration sensor, or a torsional vibration viscosity sensor to achieve accurate measurement of the dynamic viscosity.

[0058] Furthermore, the first detection unit 10 may also be or simultaneously include a measuring device for measuring density, temperature, solid content or pH value of the fluid.

[0059] The second detection unit 40 is mounted on the side wall of the leveling chamber 30 opposite the diversion hole 22. The second detection unit 40 is preferably a distance sensor, used to measure in real time the thickness of the fluid film formed on the vertically connected wall surface after the fluid flows out of the diversion hole 22. The distance sensor is preferably an ultrasonic sensor or a photoelectric distance sensor. This configuration enables high-precision measurement of the fluid film thickness, thereby determining the film-forming characteristics of the fluid and measuring its slurry leveling characteristics.

[0060] Furthermore, it also includes a collecting chamber 50 arranged at the bottom of the detection chamber 20 and the leveling chamber 30. The detection chamber 20 is connected to the collecting chamber 50 through the measuring hole 24 and the rheological measuring tube 25, and the leveling chamber 30 is connected to the collecting chamber 50 through the flow hole 31; a discharge hole 51 is set on the collecting chamber 50.

[0061] Furthermore, for automated and accurate measurement, a temperature sensor and control circuit are included. The temperature sensor is installed in the detection chamber 20, and the control circuit collects data from each sensor, calculates, displays, and controls various components. This arrangement can achieve automated measurement and adjust the results through stable parameters, eliminating the interference of temperature factors on the test results.

[0062] The beneficial effects of the device for online measuring fluid rheological properties are:

[0063] First, the dual-cavity design of the detection chamber 20 and the leveling chamber 30 enables simultaneous online measurement of the dynamic viscosity and kinematic viscosity of the measured fluid. Since dynamic viscosity is measured using rotation or vibration, while kinematic viscosity measures the flow characteristics of the fluid under the action of its own weight, the two measurements use different forces and shear rates. This structure increases the measurement information of the rheological properties of complex fluids such as battery slurries, coatings, or polymer solutions, improving the accuracy and timeliness of fluid property judgments.

[0064] Secondly, the device can measure the leveling characteristics of a fluid. The fluid slowly enters the leveling chamber 30 from the detection chamber 20 through the guide hole 22. Because the bottom edge of the guide hole 22 is a horizontal plane and the fluid has high viscosity, the fluid flowing through the guide hole 22 spreads along the length of the leveling chamber 30 wall before flowing downward, forming a thick fluid film on the wall surface. When the measured fluid stops entering the leveling chamber, the fluid film continues to flow downward under the action of gravity, causing the thickness of the fluid film to decrease. This thickness change is measured by the second detection unit 40 installed on the opposite wall, effectively measuring the fluid's slurry leveling characteristics.

[0065] Third, the detection chamber 20 and the leveling chamber 30 are connected through a flow guide hole 22 of a specific structure, and the cross-sectional area of ​​the flow guide hole 22 is larger than the cross-sectional area of ​​the feed hole 23, and the cross-sectional area of ​​the flow hole 31 is larger than the cross-sectional area of ​​the flow guide hole 22. This structural design makes the outflow of the flow guide hole 22 greater than the inflow of the feed hole 23, thereby achieving the leveling of the liquid in the detection chamber 20, that is, the dynamic stability of the liquid level height in the detection chamber 20, greatly improving the stability of the detection environment and the accuracy of the detection, while reducing the number of control components, optimizing the operation steps, and simplifying the operation;

[0066] Fourthly, in combination with the dual-chamber leveling structure of the device, the solenoid valve 26 is used to control the opening of the measuring hole 24, and a rheological measuring tube 25 of appropriate diameter is selected according to the fluid characteristics. By measuring the time it takes for a certain volume of fluid to flow out of the measuring hole 24, the kinematic viscosity of the liquid can be proportionally converted, thus achieving the function of a viscosity measuring cup;

[0067] Fifth, the device can be adapted to a variety of different sensors or detection instruments, has strong versatility and wide applicability, and can not only measure the dynamic viscosity, kinematic viscosity and leveling characteristics of the fluid, but also can measure the density, temperature, solid content or pH value of the fluid according to the specific type or structure of the first detection unit as needed.

[0068] The present invention also provides a method for online measurement of fluid rheological properties, which is used for at least one of dynamic viscosity measurement, kinematic viscosity measurement and leveling property measurement:

[0069] Dynamic viscosity measurement is performed using any of the above-mentioned devices for online measurement of fluid rheological properties. The specific steps are as follows:

[0070] S1, measurement starts, closing the measuring hole 24;

[0071] S2, the measured fluid enters the detection chamber 20 through the feed hole 23, and the liquid level gradually rises and flows into the leveling chamber 30 through the guide hole 22;

[0072] S3. When the liquid level reaches the set value h0, the reading and temperature value of the first detection unit 10 are collected and recorded, and the dynamic viscosity of the fluid is calculated;

[0073] S4, the measured fluid flows out of the leveling chamber 30 through the flow hole 31, so that the measured fluid in the detection chamber 20 is continuously updated, but the liquid level remains unchanged, and the measurement data of the first detection unit 10 is updated in real time;

[0074] Kinematic viscosity measurement uses an online device for measuring fluid rheological properties with a rheometer tube. The specific steps are as follows:

[0075] S1. Select a rheological measuring tube 25 that matches the viscosity range of the fluid being measured; the greater the viscosity, the larger the tube diameter;

[0076] S2, close the measuring hole 24; the measured fluid enters the detection chamber 20 through the feed hole 23, and after the liquid level reaches the set value h0, the feed hole 23 is closed;

[0077] S3, the measuring hole 24 is opened, the timer is started, and the liquid level change is measured and recorded in real time;

[0078] S4. As the fluid in the detection chamber 20 flows out of the measuring hole 24, the liquid level continues to decrease. When the liquid level measurement value reaches the set value h1, the measuring hole 24 is closed and the timing is stopped.

[0079] S5. Calculate the kinematic viscosity of the fluid based on the time it takes for the fluid to flow out of the detection chamber 20 and the inner diameter of the rheological measuring tube 25;

[0080] Leveling properties are measured using any of the above-mentioned devices for online measurement of fluid rheological properties. The specific steps are as follows:

[0081] S1, measurement starts, the measuring hole 24 is closed, and the measured fluid enters the detection chamber 20 through the feed hole 23;

[0082] S2, after the liquid level reaches the set value h0, the feed hole 23 is closed after a fixed delay (preferably set to 5S), and the timer is started; wherein the liquid level reaches the set value h0, preferably after the control circuit determines that the reading of the liquid level sensor 13 reaches the set value h0;

[0083] S3, the second detection unit 40 (preferably a distance measuring sensor) measures in real time the thickness of the fluid film formed on the wall after the fluid flows out of the guide hole 22;

[0084] S4. When the thickness of the fluid film being measured remains unchanged, the timing stops, and the initial thickness d0, stable thickness d1 and leveling time of the fluid film are recorded, and compared with the pre-stored control standard to obtain the leveling / film-forming characteristics of the fluid being measured, where the initial thickness d0 of the fluid film is the maximum fluid film thickness measured by the second detection unit 40, and the stable thickness d1 is the fluid film thickness measured when the thickness of the fluid film remains unchanged.

[0085] Preferably, in the above steps, the closing of the measuring hole 24 is preferably automated, such as providing a solenoid valve 26 in the measuring hole 24 to control its opening and closing, and controlling the opening and closing of the measuring hole 24 by the solenoid valve 26 .

[0086] Furthermore, according to different measured fluids and measurement requirements, one or any combination of the above three measurement methods is selected to form a fluid rheological property detection system.

[0087] The beneficial effects of this method for online measurement of fluid rheological properties are: first, the measurement method can be used for dynamic viscosity measurement, kinematic viscosity measurement and leveling property measurement, and has a wide range of measurement applications; second, the method adopts a dual-cavity measurement structure, which solves the problem of simultaneous contact and non-contact measurement of complex fluids. While measuring the fluid viscosity, the film-forming properties of the complex fluid are directly measured, realizing online detection of the rheological properties of the complex fluid; third, the method achieves a stable measurement environment through the specially designed guide hole 22, and the online detection accuracy is high.

[0088] 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 inventive concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A device for online measurement of fluid rheological properties, characterized in that: It comprises: a first detection unit (10), a detection chamber (20), a leveling chamber (30) and a second detection unit (40); The detection chamber (20) and the leveling chamber (30) are arranged in a horizontal order according to the fluid flow direction; a vertically connected wall between the detection chamber (20) and the leveling chamber (30) is provided with a flow guide hole (22) for connecting the detection chamber (20) and the leveling chamber (30); A feed hole (23) is provided on the detection chamber (20), and a flow hole (31) is provided at the bottom of the leveling chamber (30). The cross-sectional areas of the feed hole (23), the flow guide hole (22), and the flow hole (31) increase in sequence; the lower edge of the flow guide hole (22) is higher than the upper edge of the feed hole (23), and a measuring hole (24) is also provided at the bottom of the detection chamber (20); The first detection unit (10) is installed on the upper part of the detection chamber (20), and the second detection unit (40) is installed on the side wall of the leveling chamber (30) opposite to the guide hole (22).

2. The device for online measuring rheological properties of fluid according to claim 1, characterized in that: The first detection unit (10) is a dynamic viscosity measuring device; The second detection unit (40) is a distance measuring sensor, which is used to measure in real time the thickness of the fluid film formed on the vertically connected wall surface after the fluid flows out of the guide hole (22).

3. The device for online measuring fluid rheological properties according to claim 2, characterized in that: The dynamic viscosity detection device is any one of a rotational viscometer, a tuning fork vibration sensor and a torsional viscosity sensor; The distance measuring sensor is an ultrasonic sensor or a photoelectric distance measuring sensor.

4. The device for online measurement of fluid rheological properties according to claim 1, characterized in that: A conical surface (21) is provided at the bottom of the detection cavity (20), a measuring hole (24) is provided at the center of the conical surface (21), and a liquid level sensor (13) is provided inside the detection cavity (20) for measuring the liquid level height of the fluid in the detection cavity (20) in real time.

5. The device for online measuring rheological properties of fluid according to claim 4, characterized in that: The liquid level sensor (13) is any one of a capacitance sensor, an ultrasonic sensor and a photoelectric sensor.

6. The device for online measuring rheological properties of fluid according to claim 4, characterized in that: A rheological measuring tube (25) is installed on the measuring hole (24), and a solenoid valve (26) is provided on the rheological measuring tube (25).

7. The device for online measurement of fluid rheological properties according to claim 6, characterized in that: The invention also includes a manifold (50) arranged at the bottom of the detection chamber (20) and the leveling chamber (30); the detection chamber (20) is connected to the manifold (50) through a measuring hole (24) and a rheological measuring tube (25); the leveling chamber (30) is connected to the manifold (50) through a flow hole (31); and a discharge hole (51) is provided on the manifold (50).

8. The device for online measuring rheological properties of a fluid according to any one of claims 1 to 7, characterized in that: The guide hole (22) is a flat hole or a slot arranged in a horizontal direction, and the lower edge of the flat hole or the slot has a plane arranged in a horizontal direction.

9. A method for online measurement of fluid rheological properties, characterized in that: The measuring method is used for at least one of dynamic viscosity measurement, kinematic viscosity measurement and leveling property measurement: The dynamic viscosity is measured using the device according to any one of claims 1 to 8, and the specific steps are as follows: S1, measurement starts, closing the measuring hole (24); S2, the measured fluid enters the detection chamber (20) through the feed hole (23), the liquid level gradually rises and flows into the leveling chamber (30) through the guide hole (22); S3, when the liquid level reaches the set value h0, collecting and recording the reading and temperature value of the first detection unit (10), and calculating the dynamic viscosity of the fluid; S4, the measured fluid flows out of the leveling chamber (30) through the flow hole (31), so that the measured fluid in the detection chamber (20) is continuously updated, but the liquid level remains unchanged, and the measurement data of the first detection unit (10) is updated in real time; The kinematic viscosity is measured using the device described in claim 6 or 7, and the specific steps are as follows: S1. Select a rheological measuring tube (25) that matches the viscosity range of the fluid being measured; the greater the viscosity, the larger the tube diameter; S2, closing the measuring hole (24); the measured fluid enters the detection chamber (20) through the feed hole (23), and after judging that the liquid level reaches the set value h0, the feed hole (23) is closed; S3, the measuring hole (24) is opened, the timer is started, and the liquid level change is measured and recorded in real time; S4, as the fluid in the detection chamber (20) flows out of the measuring hole (24), the liquid level continues to decrease; when the liquid level measurement value reaches the set value h1, the measuring hole (24) is closed and the timing is stopped; S5. Calculate the kinematic viscosity of the fluid based on the time it takes for the fluid to flow out of the detection chamber (20) and the inner diameter of the rheological measuring tube (25); The leveling characteristics are measured using the device described in any one of claims 1 to 8, and the specific steps are as follows: S1, measurement starts, the measuring hole (24) is closed, and the measured fluid enters the detection chamber (20) through the feed hole (23); S2, after the liquid level reaches the set value h0, the feed hole (23) is closed after a fixed delay, and the timer is started; S3, a second detection unit (40) measures in real time the thickness of a fluid film formed on the wall surface after the fluid flows out of the guide hole (22); S4. When the thickness of the fluid film being measured remains unchanged, the timing is stopped, and the initial thickness d0, stable thickness d1 and leveling time of the fluid film are recorded, and compared with the pre-stored control standard to obtain the leveling / film-forming characteristics of the fluid being measured, wherein the initial thickness d0 of the fluid film is the maximum fluid film thickness measured by the second detection unit (40), and the stable thickness d1 is the fluid film thickness measured when the thickness of the fluid film remains unchanged.

10. The method according to claim 9, characterized in that According to different measured fluids and measurement requirements, one of the above three measurement methods or any combination thereof is selected to form a fluid rheological properties detection system.

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