Flow type liquid viscosity measuring device

Abstract

The utility model discloses a flowing type liquid viscosity measuring device. The measuring device comprises a cup body, an inner container, a weighing sensor, a liquid level sensor and a measuring circuit, the section of the inner container is in a cylinder or inverted frustum shape, the inner container is coaxially installed in the cup body, outflow holes are formed in the bottom of the cup body and the bottom of the inner container, and the inner container outflow hole is located in the upper portion of the cup body outflow hole. The weighing sensor is installed at the bottom of the cup body, and the inner container is installed on the weighing sensor directly or through a tray. The weighing sensor and the liquid level sensor are both electrically connected with the measuring circuit, the weighing sensor measures the mass of the liquid to be measured in the inner container in real time, and the measured value is recorded through the measuring circuit. The device has the effects of realizing on-line measurement of low-shear kinematic viscosity and density of liquid, and being fast in response, high in precision and high in reliability.

Description

Technical Field

[0001] This utility model relates to the field of industrial automation technology, and in particular to a flow liquid viscosity measuring device. Background Technology

[0002] Industrial automation applications require extensive use of online viscosity sensors to measure real-time fluid parameters, such as in lubricating oil condition monitoring, lithium-ion battery slurry production, and chemical product manufacturing. Currently, online viscosity measurement primarily employs vibration or torsional vibration techniques to measure the dynamic viscosity of liquids under high shear. Low-shear kinematic viscosity of liquids is typically measured using capillary tubes in the laboratory and in the field using viscosity cups. However, flow-based viscosity measurement using viscosity cups has several drawbacks: firstly, it is currently a manual operation, requiring high skill levels, resulting in long measurement times and low accuracy, and is primarily used for on-site sampling and screening; secondly, while industry attempts have focused on automating flow-based viscosity measurement, these methods generally suffer from complex structures, low accuracy, and long response times, hindering their application in practical online measurements. Utility Model Content

[0003] To address one or more of the aforementioned problems, this invention provides a flow liquid viscosity measuring device.

[0004] According to one aspect of the present invention, a flow liquid viscosity measuring device includes: a cup body, an inner liner, a weighing sensor, and a measuring circuit.

[0005] The inner liner has a cylindrical or inverted frustum cross-section and is coaxially installed inside the cup body. Both the cup body and the bottom of the inner liner have outflow holes, with the outflow hole of the inner liner located above the outflow hole of the cup body.

[0006] The load cell is installed at the bottom of the cup body, and the inner liner is installed directly on the load cell or through a tray. The load cell is electrically connected to the measuring circuit. The load cell measures the mass of the liquid in the inner liner in real time and records the measured value through the measuring circuit.

[0007] In some embodiments, a liquid level sensor and a temperature sensor are also included, both of which are electrically connected to the measuring circuit. Both the liquid level sensor and the temperature sensor are installed on the bottom surface of the inner liner. The liquid level sensor includes an electrode post, and a capacitive sensor is formed between the two electrode posts or between the electrode post and the inner liner cavity wall to measure the liquid level height of the liquid being measured in the inner liner in real time.

[0008] In some embodiments, the electrode post is a stainless steel post with a polymer film coated on its surface.

[0009] In some implementations, the weighing sensor is a parallel beam weighing sensor or a ring force sensor.

[0010] In some implementations, a liquid collection cup is provided below the cup body, and the liquid collection cup is movably connected to the cup body.

[0011] In some embodiments, a guide tube is provided on the outlet hole of the inner liner, the length of which is adapted to the viscosity range of the liquid being tested, and a guide ring with a trapezoidal cross-section is provided on the top of the cup body to collect the liquid being tested into the inner liner.

[0012] In some embodiments, the inner liner is a standard viscosity measuring cup, which is movably mounted on a cylindrical tray;

[0013] The bottom of the cylindrical tray has an outlet hole that coincides with the axis of the outlet hole of the inner liner and the outlet hole of the cup.

[0014] In some implementations, a handle is provided on the outside of the cup body, and a measurement start button is provided on the handle.

[0015] In some embodiments, it also includes: a top cover, an inlet pipe, an outlet pipe, a bypass pipe, a three-way valve, and a liquid pump; wherein the inlet pipe is installed on the top cover, the outlet pipe is installed at the bottom of the cup body and connected to the outlet hole of the cup body; the bypass pipe is installed between the inlet pipe and the outlet pipe, and a three-way valve is provided at the connection between the bypass pipe and the inlet pipe.

[0016] In some implementations, the inlet pipe, the guide pipe, and the outlet hole of the cup are arranged sequentially from top to bottom. The inner diameter of the inlet pipe is larger than the diameter of the guide pipe. The three-way valve and the liquid pump are both electrically connected to the measuring circuit. Attached Figure Description

[0017] Figure 1 This is a cross-sectional schematic diagram of the portable fluid viscosity measuring device according to Embodiment 1 of this utility model;

[0018] Figure 2 for Figure 1 A top view schematic diagram of the portable fluid viscosity measuring device shown.

[0019] Figure 3 This is a schematic diagram of a fluid viscosity measuring device with a frustum-shaped measuring cup according to Embodiment 2 of this utility model;

[0020] Figure 4 This is a schematic diagram of the fluid viscosity measuring device with a standard measuring cup according to the present invention;

[0021] Figure 5 This is a schematic diagram of the online fluid viscosity and density measuring device according to Embodiment 3 of this utility model;

[0022] 10. Cup body, 11. Cup body outlet, 12. Guide tube, 13. Cylindrical tray, 14. Handle, 15. Measurement start button, 16. Liquid collection cup;

[0023] Inner liner 20, inner liner outlet 21, guide ring 22, standard viscosity measuring cup 23;

[0024] Weighing sensor 30, electrode post 31, temperature sensor 32, parallel beam weighing sensor 33, and ring force sensor 34;

[0025] Measurement circuit 40;

[0026] Top cover 50, inlet pipe 51, outlet pipe 52, bypass pipe 53, three-way valve 54, liquid pump 55. Detailed Implementation

[0027] 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.

[0028] Figures 1 to 5 The illustration schematically shows a flow-type liquid viscosity measuring device according to the present invention, which can be applied in industrial fluid production sites such as lithium-ion battery slurry, paint and latex, in scenarios where the kinematic viscosity of industrial fluids needs to be checked frequently. The flow-type liquid viscosity measuring device directly replaces the existing manual checking method of viscosity measuring cup and timer, realizing the measurement of kinematic viscosity during the sampling process, and then the liquid collection cup is removed and sent to the laboratory for comparison measurement and verification, which will greatly save on-site manpower and measurement time.

[0029] Example 1

[0030] like Figure 1 As shown, a flow liquid viscosity measuring device is presented as a portable automatic measuring cup, including: a cup body 10, an inner liner 20, a weighing sensor 30, and a measuring circuit 40;

[0031] The inner liner 20 has a cylindrical cross-section, such as... Figure 1 As shown in Figure 2, the inner liner 20 is coaxially installed inside the cup body 10. Both the cup body 10 and the inner liner 20 have outlet holes at their bottoms, and the outlet hole 21 of the inner liner is located above the outlet hole 11 of the cup body.

[0032] The load cell 30 is installed at the bottom of the cup body 10, and the inner liner 20 is installed directly or via a tray on the load cell 30. The load cell 30 is electrically connected to the measuring circuit 40, and measures the mass of the liquid in the inner liner 20 in real time, recording the measured value through the measuring circuit 40. The load cell 30 is preferably a parallel beam load cell 33, a ring force sensor 34, etc.

[0033] Preferably, it also includes a liquid level sensor, which is electrically connected to the measuring circuit 40. The liquid level sensor typically uses an electrode post 31, which is mounted on the bottom surface of the inner liner 20. The electrode post 31 is preferably a stainless steel post with a polymer film coated on its surface. The liquid level sensor can be a single-electrode type or a dual-electrode type. When a single-electrode type liquid level sensor is used, a capacitive sensor is formed between the electrode post 31 and the cavity wall of the inner liner 20, thus allowing real-time measurement of the liquid level in the inner liner 20. When a dual-electrode type liquid level sensor is used, such as... Figure 2 As shown, a capacitive sensor is formed between the two electrode posts 31, which can then measure the liquid level in the inner tank 20 in real time. Of course, the specific type of liquid level sensor is not limited to the electrode post structure, and other types of liquid level sensors can also be used.

[0034] This flow-type liquid viscosity measuring device employs a method where the velocity of the liquid flowing into the inner tank is greater than its outflow velocity. It simultaneously measures the mass change during the inflow and outflow process. By selecting the slope of the mass change at a specific stage of the outflow process, the kinematic viscosity of the liquid is obtained. Compared to the traditional method of blocking the outlet of the viscosity cup to measure the time it takes for the liquid to flow out, this device offers several advantages: First, it enables online measurement of the low-shear kinematic viscosity of liquids, resulting in a fast response time and improved accuracy. Second, the integrated viscosity measuring cup design with a capacitive sensor allows for simultaneous measurement of both viscosity and density, enabling online measurement of both simultaneously. Third, it features a simple structure, high reliability, and significant practical value.

[0035] Preferred, such as Figures 1 to 2 As shown, it also includes a temperature sensor 32, which is electrically connected to the measurement circuit 40. The temperature sensor 32 is installed on the bottom surface of the inner tank 20 and is used to measure the temperature of the liquid being measured in real time. Since the viscosity of the liquid is usually affected by temperature, the real-time measurement of the temperature can be used to compensate for the viscosity of the liquid.

[0036] Preferably, since the liquid being tested flows into the inner liner 20 and then flows out through the inner liner outlet hole 21 and the cup body outlet hole 11, a liquid collection cup 16 can be provided below the cup body 10 for the purpose of collecting the outflowing liquid. The liquid collection cup 16 is movably connected to the cup body 10. Common movable connection methods can be threaded connection, snap-fit, etc.

[0037] To further facilitate the flow of the measured liquid, a flow guide tube 12 is provided on the outlet hole 21 of the inner liner. The flow guide tube 12 extends into the outlet hole 11 of the cup body. The length of the flow guide tube 12 is adapted to the viscosity range of the liquid being measured. A flow guide ring 22 with a trapezoidal cross section is provided on the top of the cup body 10. The flow guide ring 22 is used to collect the liquid being measured into the inner liner 20. The flow guide ring 22 and the cup body 10 are usually detachably connected, and the inner diameter of the small diameter end of the flow guide ring 22 is smaller than the inner diameter of the inlet of the inner liner 20.

[0038] Preferably, the inner liner 20 of the measuring cup can be a standard viscosity measuring cup 23, such as the Zein cup, Ford cup, ISO viscosity cup and DIN viscosity cup commonly used in the industry. It is movably mounted on the cylindrical tray 13. The bottom of the tray 13 is provided with an outlet hole that coincides with the axis of the outlet hole 21 of the inner liner and the outlet hole 11 of the cup body. A handle 14 is provided on the outside of the cup body 10, and a measurement start button 15 is provided on the handle 14.

[0039] The flow-type liquid viscosity measuring device in Example 1 is typically used to measure liquids with small density changes. The steps for measuring liquid viscosity using this flow-type liquid viscosity measuring device are as follows:

[0040] S1. Hold the handle 14 to keep the axis of the cup body 10 perpendicular to the ground; preferably, the measuring cup should be cleaned and kept dry before measurement.

[0041] S2. When the measurement start button 15 is turned on, the liquid to be measured flows rapidly into the inner tank 20 until the height of the liquid in the inner tank 20 exceeds 2 / 3 of the height of the inner tank 20.

[0042] S3. Keep the measuring device horizontal until the liquid being measured has completely flowed out of the inner tank 20;

[0043] S4. The measuring circuit 40 records the mass of the liquid being measured over time in real time until the mass change per unit time is less than m1, where m1 < 5g.

[0044] S5. Calculate the absolute value k of the rate of change of the mass of the liquid being tested between a×M0 and b×M0, where M0 is the maximum mass value of the liquid being tested in the inner liner 20 measured by the weighing sensor 30, 1>a>0.3, 0.5>ab>0.

[0045] S6 and k values ​​are related to the viscosity of the liquid being tested, and the viscosity value of the liquid can be obtained through calibration.

[0046] S7. Measure the temperature of the liquid being tested, and use it to compensate for the calculated viscosity or density value.

[0047] For step S5, since the value of k gradually decreases as the amount of liquid in the viscosity cup decreases, it is necessary to select a value of k under the same conditions to obtain the kinematic viscosity of the liquid so that the measurement will be relatively accurate. Therefore, based on a large number of experiments, this invention sets this condition as the absolute value of the rate of change of the mass of the liquid being measured between a×M0 and b×M0, where M0 is the maximum mass value of the liquid being measured in the inner liner measured by the weighing sensor, 1>a>0.3, 0.5>ab>0.

[0048] Currently, the method for measuring kinematic viscosity using a viscosity cup involves measuring the time it takes for a certain volume of fluid to flow out through a small hole at the bottom of the cup, which can then be proportionally converted into the liquid's kinematic viscosity. This method is cumbersome and time-consuming. This invention replaces the above method of measuring outflow time by measuring the mass of liquid flowing out per unit time, i.e., the slope k of the mass change with time. For liquids with the same or similar densities, this method is faster and more accurate because the force sensor has high precision in measuring mass changes and a fast response time.

[0049] Example 2

[0050] Unlike Example 1, as Figure 3 As shown, the cross-section of the inner liner 20 is an inverted frustum shape, with its larger diameter end facing upwards and its smaller diameter end facing downwards. This arrangement is more conducive to measuring the flow of liquid.

[0051] Example 3

[0052] Unlike Embodiments 1 and 2, the online measuring device further includes: a top cover 50, an inlet pipe 51, an outlet pipe 52, a bypass pipe 53, a three-way valve 54, and a liquid pump 55. The inlet pipe 51 is mounted on the top cover 50, and the outlet pipe 52 is mounted on the bottom of the cup body 10 and connected to the cup body outlet hole 11. The bypass pipe 53 is installed between the inlet pipe 51 and the outlet pipe 52. A three-way valve 54 is installed at the connection between the bypass pipe 54 and the inlet pipe 51. The inlet pipe 51, the guide pipe 12, and the cup body outlet hole 11 are arranged sequentially from top to bottom. The inner diameter of the inlet pipe 51 is larger than the inner diameter of the guide pipe 12. The three-way valve 53 and the liquid pump 55 are both electrically connected to the measuring circuit 40. The inlet pipe 51 is used to connect to the pipeline transporting the liquid being measured. Its advantages are: this structure realizes online measurement of kinematic viscosity and density, with a simple structure, high reliability, and high practicality.

[0053] The online measuring device of this invention is typically used to measure liquids with different densities. The specific measurement method is as follows:

[0054] S1. The measuring device is installed in the pipeline that transports the liquid to be measured, keeping the axis of the cup body 10 perpendicular to the ground;

[0055] S2. Measurement begins. Three-way valve 54 closes inlet pipe 51 and opens bypass pipe 53. Liquid pump 55 starts. The original liquid to be measured flows out from bypass pipe 53 to refresh the liquid to be measured in the pipeline.

[0056] S3. After the measuring circuit 40 times for a period of time t0, it controls the three-way valve 54 to close the bypass pipe 53 and open the liquid inlet pipe 51. The liquid to be measured flows into the inner tank 20 quickly through the liquid inlet pipe 51. The speed at which the liquid flows into the inner tank 20 is much higher than the speed at which it flows out through the outlet hole 21 of the inner tank.

[0057] S4. Electrode post 31 measures the real-time height of the liquid being measured, and weighing sensor 30 measures the real-time mass of the liquid being measured. When the liquid height reaches the preset value h0, the liquid mass m0 is recorded. Then, the inlet pipe 51 is closed, the bypass pipe 53 is opened, and the liquid pump 55 stops working.

[0058] The density ρ of the liquid being tested is calculated from m0, h0, and the cross-sectional area of ​​the inner liner 20.

[0059] S5. The measuring circuit 40 records the mass of the liquid being measured over time in real time until the mass change per unit time is less than m1, where m1 < 5g.

[0060] S6. Calculate the absolute value k of the rate of change of the mass of the measured liquid between a×m0 and b×m0, where: 1>a>0.3, 0.5>ab>0;

[0061] S7. Calculate the value of k / ρ, and obtain the viscosity value of the liquid based on the calibration between k / ρ and the liquid viscosity;

[0062] S8. Measure the temperature of the liquid being tested, and use it to compensate for the calculated viscosity or density value.

[0063] In step S6, since the value of k gradually decreases as the amount of liquid in the viscosity cup decreases, it is necessary to select a k value under the same conditions to obtain the kinematic viscosity of the liquid. Based on a large number of experiments, this invention defines this condition as: calculating the absolute value of k of the rate of change of the mass of the measured liquid between a*m0 and b*m0, where 1>a>0.3, 0.5>ab>0.

[0064] For step S7, since the densities of the liquids being measured vary, it is necessary to first measure the density ρ of the liquid. Then, by dividing the mass change k per unit time by the liquid density, the volume change k / ρ per unit time can be obtained. The volume change per unit time is inversely proportional to the outflow time of the liquid, thus the kinematic viscosity of the liquid can be obtained. This invention uses a level sensor to measure the liquid level height h0, which, when multiplied by the cross-sectional area of ​​the viscosity cup, yields the liquid volume v0. Since the mass m0 of the liquid is measured by a weighing sensor, the density ρ of the liquid can be calculated.

[0065] The above descriptions 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 all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A flow-type liquid viscosity measuring device, characterized in that, Includes: cup body (10), inner liner (20), weighing sensor (30) and measuring circuit (40); The inner liner (20) has a cylindrical or inverted frustum cross section and is coaxially installed inside the cup body (10). Both the cup body (10) and the inner liner (20) have outlet holes at their bottoms, and the outlet hole (21) of the inner liner is located above the outlet hole (11) of the cup body. The weighing sensor (30) is installed at the bottom of the cup body (10), and the inner liner (20) is installed directly or through a tray on the weighing sensor (30); the weighing sensor (30) is electrically connected to the measuring circuit (40), and the weighing sensor (30) measures the mass of the liquid being measured in the inner liner (20) in real time and records the measured value through the measuring circuit (40).

2. The flow liquid viscosity measuring device according to claim 1, characterized in that, It also includes a liquid level sensor and a temperature sensor (32), both of which are electrically connected to the measuring circuit (40). The liquid level sensor and the temperature sensor (32) are both installed on the bottom surface of the inner liner (20). The liquid level sensor includes an electrode post (31), which forms a capacitive sensor between the two electrode posts (31) or between the electrode post (31) and the cavity wall of the inner liner (20), and measures the liquid level height of the liquid being measured in the inner liner (20) in real time.

3. The flow liquid viscosity measuring device according to claim 2, characterized in that, The electrode post (31) is a stainless steel post with a polymer film coated on its surface.

4. The flow liquid viscosity measuring device according to claim 1, characterized in that, The weighing sensor (30) is a parallel beam weighing sensor (33) or a ring force sensor (34).

5. The flow liquid viscosity measuring device according to claim 1, characterized in that, A liquid collection cup (16) is provided below the cup body (10), and the liquid collection cup (16) is movably connected to the cup body (10).

6. The flow liquid viscosity measuring device according to claim 1, characterized in that, A guide tube (12) is provided on the outlet hole (21) of the inner liner. The length of the guide tube (12) is adapted to the viscosity range of the liquid being tested. A guide ring (22) with a trapezoidal cross section is provided on the top of the cup body (10). The guide ring (22) is used to collect the liquid being tested into the inner liner (20).

7. The flow liquid viscosity measuring device according to claim 1, characterized in that, The inner liner (20) is a standard viscosity measuring cup (23), which is movably mounted on a cylindrical tray (13); The bottom of the cylindrical tray (13) is provided with an outlet hole that coincides with the axis of the outlet hole (21) of the inner liner and the outlet hole (11) of the cup body.

8. The flow liquid viscosity measuring device according to claim 7, characterized in that, A handle (14) is provided on the outside of the cup body (10), and a measurement start button (15) is provided on the handle (14).

9. The flow liquid viscosity measuring device according to any one of claims 1-8, characterized in that, It also includes: a top cover (50), an inlet pipe (51), an outlet pipe (52), a bypass pipe (53), a three-way valve (54), and a liquid pump (55); wherein the inlet pipe (51) is installed on the top cover (50), the outlet pipe (52) is installed at the bottom of the cup body (10) and connected to the cup body outlet hole (11); the bypass pipe (53) is installed between the inlet pipe (51) and the outlet pipe (52), and a three-way valve (54) is provided at the connection between the bypass pipe (53) and the inlet pipe (51).

10. The flow liquid viscosity measuring device according to claim 9, characterized in that, The inlet pipe (51), the guide pipe (12), and the cup outlet hole (11) are arranged in order from top to bottom. The inner diameter of the inlet pipe (51) is larger than the diameter of the guide pipe (12). The three-way valve (54) and the liquid pump (55) are both electrically connected to the measuring circuit (40).

Images