Device for measuring rheological property of fluid on line

Abstract

The utility model discloses a device for measuring rheological characteristics of fluid on line. 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 provided by the utility model has the effects of stable detection environment and accurate on-line measurement of various characteristics of complex fluid.

Description

Technical Field

[0001] This utility model relates to the field of fluid detection, and in particular to a device for online detection of the rheological properties of complex fluids such as battery slurry, suspension, and polymer solution. Background Technology

[0002] Complex fluids, such as battery slurries, mud, and paints, have high viscosity and, due to the influence of their multi-component composition and microstructure, exhibit various non-Newtonian fluid properties, such as shear thinning, shear thickening, thixotropy, and viscoelasticity. In industrial production, rheological properties such as viscosity at different shear rates or viscosity measured using different methods (e.g., dynamic and kinematic viscosity) are typically used to control the quality and process parameters of complex fluids. However, currently widely used rotational rheometers are expensive and complex to operate, making them unsuitable for on-site production and online measurement; and products capable of simultaneously measuring both dynamic and kinematic viscosity online are not yet available on the market. Utility Model Content

[0003] To address one or more of the aforementioned problems, this invention provides an apparatus for online measurement of fluid rheological properties.

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

[0005] The detection chamber and the leveling chamber are arranged horizontally in the direction of fluid flow; the vertical connecting 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] The detection chamber is equipped with a feed hole, and the leveling chamber is equipped with a flow passage hole at the bottom. The cross-sectional areas of the feed hole, the guide hole, and the flow passage hole increase in sequence. The lower edge of the guide hole is higher than the upper edge of the feed hole. 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 implementations, the first detection unit is a dynamic viscosity measuring device;

[0009] The second detection unit is 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 guide 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 vibration viscosity sensor;

[0011] The ranging sensor is either an ultrasonic sensor or a photoelectric ranging sensor.

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

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

[0014] In some implementations, a rheology measuring tube is installed on the measuring hole, and a solenoid valve is installed on the rheology measuring tube.

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

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

[0017] In some embodiments, the guide hole is an elongated groove with parallel upper and lower sides, with its long side arranged vertically and its short side arranged horizontally, and the size of the short side of the guide hole is larger than the diameter of the feed hole.

[0018] In some embodiments, a temperature sensor and a control circuit are also included, wherein the temperature sensor is installed inside the detection cavity, and the control circuit collects data from each sensor, calculates and displays the data, and controls each component.

[0019] The advantages of this device for online measurement of fluid rheological properties are:

[0020] Firstly, 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 fluid being tested. Since dynamic viscosity is measured using rotation or vibration methods, while kinematic viscosity measures the flow characteristics of the fluid under its own weight, the forces and shear rates measured by the two methods differ. 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 assessment.

[0021] Secondly, this device can measure the leveling characteristics of fluids. Fluid slowly enters the leveling cavity from the detection chamber through a guide hole. Because the bottom edge of the guide hole is horizontally oriented and the fluid has a high viscosity, the fluid flowing through the guide hole spreads along the length of the guide hole on the cavity wall and flows downwards, forming a thick fluid film on the cavity wall surface. When the fluid stops entering the leveling cavity, the fluid film continues to flow downwards under gravity, causing the thickness of the fluid film to decrease. This change in thickness is measured by a second detection unit mounted on the opposite cavity wall, enabling accurate measurement of the fluid's leveling characteristics.

[0022] Third, the detection chamber and the leveling chamber are connected by a guide hole with a specific structure. The cross-sectional area of ​​the guide hole is larger than that of the feed hole, and the cross-sectional area of ​​the flow hole is larger than that of the guide hole. This structural design makes the outflow of the guide hole greater than the inflow of the feed hole, realizing the leveling of the liquid in the detection chamber, that is, the dynamic stability of the liquid level height in the detection chamber. This greatly improves 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.

[0023] Fourth, combined with the dual-cavity flow leveling structure of this device, the measuring orifice is opened by controlling the solenoid valve, and a rheological measuring tube with an 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 orifice, the kinematic viscosity of the liquid can be converted proportionally, thus achieving the function of a viscosity measuring cup.

[0024] Fifth, the device can be adapted to a variety of different sensors or detection instruments, making it highly versatile and widely applicable. It can not only measure the dynamic viscosity, kinematic viscosity, and leveling characteristics of fluids, but also measure the density, temperature, solid content, or pH value of fluids by setting the specific type or structure of the first detection unit as needed. Attached Figure Description

[0025] Figure 1 This is a cross-sectional schematic diagram of an online fluid rheological property measurement device according to one embodiment of the present invention;

[0026] Figure 2 for Figure 1 The left view of the detection cavity and leveling cavity is shown.

[0027] Figure 3 for Figure 1 A top view of the detection chamber and the leveling chamber shown;

[0028] Figure 4 for Figure 1 A schematic cross-sectional view of the device shown in Figure AA;

[0029] First detection unit 10, liquid level sensor 13;

[0030] Detection chamber 20, 21 conical surface, guide hole 22, feed hole 23, measuring hole 24, rheology measuring tube 25, solenoid valve 26;

[0031] Leveling cavity 30, flow passage 31;

[0032] Second detection unit 40;

[0033] The flow collection chamber is 50, and the discharge port is 51. Detailed Implementation

[0034] The present 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 the directions in the accompanying drawings, while the terms "inner" and "outer" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0035] Figures 1 to 4 An apparatus for online measurement of fluid rheological properties is schematically shown according to the following embodiment of the present invention.

[0036] As shown in the figure, the device for online measurement of fluid rheological properties includes: a first detection unit 10, a detection chamber 20, a leveling chamber 30, and a second detection unit 40;

[0037] The detection chamber 20 and the leveling chamber 30 are arranged horizontally in the direction of fluid flow. The vertical connecting 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 any shape, as long as it facilitates the flow of liquid between the detection chamber and the leveling chamber 30. However, in order to improve the leveling effect, the guide hole 22 is preferably 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 guide hole 22 will spread out on the vertically connected wall between the detection chamber 20 and the leveling chamber 30 and then flow downwards, forming a fluid film similar to a coating on the surface of the vertically connected wall. Due to the high viscosity of the complex fluid, the initial thickness of the fluid film is relatively large. As the feed hole 23 of the detection chamber 20 closes, no more fluid flows into the leveling chamber 30. Therefore, the fluid on the vertically connected wall continues to flow downwards along the wall under the action of gravity, and thus the thickness of the fluid film decreases. Measuring the initial thickness d0 of the fluid film, the thickness d1 after fluid leveling, and the time interval between the thickness decreasing from d0 to d1 can well characterize the coating and film-forming characteristics of the complex fluid. These coating and film-forming characteristics of the fluid can be measured by the second detection unit 40.

[0038] In a further preferred embodiment, the guide hole 22 is an elongated groove with parallel upper and lower sides, its long sides arranged vertically and its short sides arranged horizontally, and the short side dimension of the guide hole 22 is larger than the diameter of the feed hole 23. This structure allows for more uniform and stable film formation of complex fluids, facilitating detection.

[0039] A feed inlet 23 is provided on the detection chamber 20, and a flow passage 31 is provided at the bottom of the leveling chamber 30. The cross-sectional areas of the feed inlet 23, the guide hole 22, and the flow passage 31 increase sequentially. The lower edge of the guide hole 22 is higher than the upper edge of the feed inlet 23. This arrangement allows the outflow rate of the guide hole 22 to be greater than the inflow rate of the feed inlet 23, achieving fluid leveling within the detection chamber 20, i.e., ensuring high fluid stability within the detection chamber 20, which facilitates accurate measurement by the detection unit 10.

[0040] 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 the 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 real-time measurement of the fluid level height within the detection chamber 20. The liquid level sensor 13 is preferably any one of a capacitive sensor, an ultrasonic sensor, and a photoelectric sensor, and the selected liquid level sensor 13 has excellent detection accuracy. More preferably, 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. When the solenoid valve 26 is opened, the fluid flows out from the measuring hole 24 and the rheological measuring tube 25. 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. For fluids of different viscosities, rheological measuring tubes 25 with different diameters and lengths can be set to ensure the accuracy and timeliness of the measurement.

[0041] The first detection unit 10 is installed on the upper part of the detection chamber 20. The first detection unit 10 is a dynamic viscosity measuring device for measuring the dynamic viscosity of a 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 dynamic viscosity.

[0042] Furthermore, the first detection unit 10 may also be equipped with a measuring device for measuring the density, temperature, solid content, or pH value of the fluid, or may also be equipped with a measuring device for measuring the fluid.

[0043] The second detection unit 40 is installed on the side wall of the leveling cavity 30 opposite to the guide 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 guide hole 22. An ultrasonic sensor or a photoelectric distance sensor is preferred. This setup enables high-precision measurement of the fluid film thickness, thereby obtaining the film-forming characteristics of the fluid and realizing the measurement of the fluid's coating and leveling characteristics.

[0044] Furthermore, it also includes a flow collecting cavity 50 located at the bottom of the detection cavity 20 and the leveling cavity 30. The detection cavity 20 is connected to the flow collecting cavity 50 through the measuring hole 24 and the rheological measuring tube 25. The leveling cavity 30 is connected to the flow collecting cavity 50 through the flow passage 31. A discharge hole 51 is provided on the flow collecting cavity 50.

[0045] Furthermore, for automated and accurate measurement, a temperature sensor and control circuit are also included. The temperature sensor is installed inside the detection chamber 20, and the control circuit collects data from each sensor, calculates and displays the data, and controls each component. The beneficial effects are: this setup enables automated measurement and adjusts the results through stable parameters, eliminating the interference of temperature factors on the detection results.

[0046] The advantages of this device for online measurement of fluid rheological properties are:

[0047] Firstly, the dual-cavity design of the detection cavity 20 and the leveling cavity 30 enables simultaneous online measurement of the dynamic viscosity and kinematic viscosity of the fluid being tested. Since dynamic viscosity is measured using rotation or vibration methods, while kinematic viscosity measures the flow characteristics of the fluid under its own weight, the forces and shear rates measured by the two methods differ. 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 assessment.

[0048] Secondly, this device can measure the leveling characteristics of fluids. Fluid slowly enters the leveling cavity 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 a high viscosity, the fluid flowing through the guide hole 22 spreads along the length of the guide hole 22 on the cavity wall of the leveling cavity 30 and then flows downwards, forming a thick fluid film on the cavity wall surface. When the fluid stops entering the leveling cavity, the fluid film continues to flow downwards under the influence of gravity, causing the thickness of the fluid film to decrease. This change in thickness is measured by the second detection unit 40 installed on the opposite cavity wall, thus enabling accurate measurement of the fluid's leveling characteristics.

[0049] Thirdly, the detection chamber 20 and the leveling chamber 30 are connected by a guide hole 22 with a specific structure. The cross-sectional area of ​​the guide hole 22 is larger than that of the feed hole 23, and the cross-sectional area of ​​the flow hole 31 is larger than that of the guide hole 22. This structural design makes the outflow of the guide hole 22 greater than the inflow of the feed hole 23, realizing 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. This greatly improves 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.

[0050] Fourth, combined with the dual-cavity flow leveling structure of this device, the measuring hole 24 is opened by controlling the solenoid valve 26, and a rheological measuring tube 25 with an 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 converted proportionally, thus achieving the function of a viscosity measuring cup.

[0051] Fifth, the device can be adapted to a variety of different sensors or detection instruments, making it highly versatile and widely applicable. It can not only measure the dynamic viscosity, kinematic viscosity, and leveling characteristics of fluids, but also measure the density, temperature, solid content, or pH value of fluids by setting the specific type or structure of the first detection unit as needed.

[0052] This invention also provides a method for online measurement of fluid rheological properties, which can be used for at least one of dynamic viscosity measurement, kinematic viscosity measurement, and leveling property measurement.

[0053] Dynamic viscosity measurement, using any of the above-mentioned online fluid rheological property measurement devices, involves the following specific steps:

[0054] S1. Measurement begins; turn off measuring hole 24.

[0055] S2. The fluid to be measured 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.

[0056] 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.

[0057] S4. The fluid being measured flows out of the leveling cavity 30 through the flow hole 31, so that the fluid being measured in the detection cavity 20 is constantly updated, but the liquid level remains unchanged, and the measurement data of the first detection unit 10 is updated in real time.

[0058] Kinematic viscosity measurement employs an online device with a rheological measuring tube to measure the rheological properties of the fluid. The specific steps are as follows:

[0059] S1. Select a rheological measuring tube 25 that matches the viscosity range of the fluid being measured; the higher the viscosity, the larger the tube diameter.

[0060] S2, shut off the measuring port 24; the fluid to be measured enters the detection chamber 20 through the feed port 23, and after the liquid level reaches the set value h0, shut off the feed port 23;

[0061] S3. Measuring hole 24 is opened, the timer is started, and the liquid level change is measured and recorded in real time;

[0062] S4. As the fluid in the detection chamber 20 flows out of the measuring hole 24, the liquid level continuously decreases; when the liquid level measurement value reaches the set value h1, the measuring hole 24 is closed and the timing stops.

[0063] S5. Calculate the kinematic viscosity of the fluid by taking 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.

[0064] For leveling characteristic measurement, any of the above-mentioned online fluid rheological property measurement devices is used. The specific steps are as follows:

[0065] S1. Measurement begins. Measuring port 24 is closed, and the fluid to be measured enters the detection chamber 20 through the feed port 23.

[0066] S2. After the liquid level reaches the set value h0, the feed port 23 is closed after a fixed delay (preferably 5 seconds), and the timer is started. Preferably, the liquid level reaches the set value h0 by the control circuit after the liquid level sensor 13 reading reaches the set value h0.

[0067] S3, the second detection unit 40 (preferably a ranging sensor) measures in real time the thickness of the fluid film formed on the wall surface after the fluid flows out of the guide hole 22;

[0068] S4. When the thickness of the fluid film being tested remains constant, the timing stops, and the initial thickness d0, stable thickness d1, and leveling time of the fluid film are recorded. The leveling / film formation characteristics of the fluid being tested are obtained by comparing them with the pre-stored control standards. 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 constant.

[0069] Preferably, in the above steps, the closing of the measuring hole 24 is preferably automated, such as by providing a solenoid valve 26 in the measuring hole 24 to control its opening and closing.

[0070] Furthermore, depending on the different fluids being measured and the measurement requirements, one or any combination of the above three measurement methods can be selected to form a fluid rheological property testing system.

[0071] The advantages of this online method for measuring fluid rheological properties are as follows: First, this method can be used for dynamic viscosity measurement, kinematic viscosity measurement, and leveling property measurement, making it widely applicable. Second, the method adopts a dual-cavity measurement structure, which solves the problem of simultaneously performing contact and non-contact measurements on complex fluids. While measuring fluid viscosity, it directly measures the film-forming properties of complex fluids, realizing online detection of the rheological properties of complex fluids. Third, the method achieves a stable measurement environment through a specially designed guide hole 22, resulting in high online detection accuracy.

[0072] The above are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

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

2. The apparatus for online measurement of fluid rheological properties 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 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 from the guide hole (22).

3. The apparatus for online measurement of 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 vibration viscosity sensor. The ranging sensor is an ultrasonic sensor or an optical ranging sensor.

4. The apparatus for online measurement of fluid rheological properties according to claim 1, characterized in that, The bottom of the detection chamber (20) is provided with a conical surface (21), 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 real-time measurement of the fluid level height inside the detection chamber (20).

5. The apparatus for online measurement of fluid rheological properties according to claim 4, characterized in that, The liquid level sensor (13) can be any one of a capacitive sensor, an ultrasonic sensor, or a photoelectric sensor.

6. The apparatus for online measurement of fluid rheological properties 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 installed on the rheological measuring tube (25).

7. The apparatus for online measurement of fluid rheological properties according to claim 6, characterized in that, It also includes a flow collection cavity (50) located at the bottom of the detection cavity (20) and the leveling cavity (30). The detection cavity (20) is connected to the flow collection cavity (50) through a measuring hole (24) and a rheological measuring tube (25). The leveling cavity (30) is connected to the flow collection cavity (50) through a flow passage (31). A discharge hole (51) is provided on the flow collection cavity (50).

8. The apparatus for online measurement of fluid rheological properties according to any one of claims 1 to 7, characterized in that, The guide hole (22) is a flat hole or groove with its length arranged in the horizontal direction, and the lower edge of the flat hole or groove has a plane arranged in the horizontal direction.

9. The apparatus for online measurement of fluid rheological properties according to claim 8, characterized in that, The guide hole (22) is a long strip groove with parallel upper and lower sides. Its long side is arranged vertically and its short side is arranged horizontally. The size of the short side of the guide hole (22) is larger than the diameter of the feed hole (23).

10. The apparatus for online measurement of fluid rheological properties according to claim 8, characterized in that, It also includes a temperature sensor and a control circuit, wherein the temperature sensor is installed in the detection cavity (20), and the control circuit collects data from each sensor, calculates, displays and controls each component.

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