Viscoelastic fluid high shear degradation experiment device and experiment method

Abstract

The present application relates to the technical field of fluid testing and energy saving, in particular to a viscoelastic fluid high shear degradation experimental device and experimental method thereof, the device comprising a stirring shaft driven to rotate by a motor, and a liquid ring pump impeller driven to rotate by the stirring shaft; a viscoelastic fluid is placed in a containing groove, and the liquid ring pump impeller is placed in the containing groove; a power meter is arranged on the motor to monitor the power of the motor, a torque meter is connected between the motor and the stirring shaft to monitor the torque of the stirring shaft, and the containing groove is connected to a rheometer through a sampling pipe to continuously monitor the rheological parameters of the viscoelastic fluid; the experimental method is to stir and shear the viscoelastic fluid by using the liquid ring pump impeller, and to repeatedly collect the rheological parameters of the viscoelastic fluid under different working conditions and different stirring durations; the present application integrates stirring, working condition adjustment, rheological measurement and energy consumption monitoring, has a compact structure, can accurately simulate multiple working conditions, and provides a reliable experimental method for efficiently screening energy-saving viscoelastic working fluids.

Description

Technical Field

[0001] This invention relates to the fields of fluid testing and energy-saving technology, and in particular to an experimental apparatus and method for high-shear degradation of viscoelastic fluids. Background Technology

[0002] As my country's primary energy source, coal safety is of paramount importance. With the increasing depth of mine mining, the amount of gas emitted has increased significantly, and the risk of gas disasters has escalated accordingly. Gas drainage is a fundamental measure to prevent gas accidents. Among them, water ring gas drainage vacuum pumps have become the mainstream equipment in coal mine gas drainage systems due to their advantages such as simple structure, high safety, good adaptability to dust- and water-containing gas, and reliable sealing.

[0003] However, water ring pumps have long suffered from high energy consumption and low efficiency. Studies have shown that the process of water, the working medium, rotating at high speed under impeller agitation to form a water ring consumes a significant amount of energy. This hydraulic loss is one of the main reasons for the overall low efficiency of the pump. In recent years, a new energy-saving approach has been proposed: using viscoelastic fluids instead of water as the working medium. The principle is that the elasticity exhibited by viscoelastic fluids in a shear flow field can reduce turbulent dissipation and flow resistance, potentially significantly reducing pump operating energy consumption. However, current methods for verifying the energy-saving effect of such fluids mainly rely on actual operational testing on large industrial-grade gas extraction pumps. This testing method not only requires the deployment of large equipment and consumes a large amount of manpower, resources, and time, but also makes it inconvenient to adjust the test conditions and systematically study the influence of factors such as eccentricity, rotational speed, and immersion depth on the relationship between rheological characteristics and energy consumption, greatly limiting the efficiency of research and development and optimization screening of new high-efficiency working fluids.

[0004] Therefore, there is an urgent need to develop a compact and easily movable tool for studying the energy-saving mechanism of viscoelastic fluids. Summary of the Invention

[0005] This invention aims to address the problems existing in the prior art by providing a portable viscoelastic fluid energy-saving testing system and its experimental method. The system is designed with modularity and miniaturization in mind, integrating functions such as simulated stirring, operating condition adjustment, rheological measurement, and energy consumption monitoring. It can accurately and efficiently evaluate the energy-saving potential of viscoelastic fluids as working fluids in gas extraction pumps in a laboratory environment.

[0006] To achieve this technical objective, the present invention adopts the following solution: An experimental apparatus for high-shear degradation of viscoelastic fluid includes a support frame mounted on an operating platform. A motor is mounted on one side of the support frame, with its output connected to a first coupling. The other end of the first coupling is connected to a torque meter, and the output of the torque meter is connected to a second coupling. The other end of the second coupling is connected to a stirring shaft, and a liquid ring pump impeller is mounted on the end of the stirring shaft. The apparatus also includes a containment tank filled with viscoelastic fluid, with the liquid ring pump impeller positioned within the fluid. The support frame consists of a fixed base and a movable base. The movable base is mounted on the fixed base and moves linearly along it, driving the motor and the liquid ring pump impeller to move axially. The side of the containment tank away from the stirring shaft is mounted on the movable platform, which drives the containment tank to move perpendicular to the axial direction. The motor is equipped with a power meter. A rheometer is mounted on one side of the containment tank, communicating with it via a sampling tube with a valve. The power meter, torque meter, and rheometer are all communicatively connected to a control console.

[0007] Compared with the prior art, the present invention employing the above-described solution has the following advantages: This invention integrates a torque meter, power meter, and rheometer, enabling simultaneous and real-time acquisition of multi-dimensional data such as stirring torque, motor energy consumption, and fluid viscoelastic parameters within a single system, thus avoiding errors associated with step-by-step testing. Furthermore, the device, through its movable base and platform, can accurately simulate the real-world working conditions of the impeller under different eccentricities and immersion depths, significantly improving the accuracy and engineering reference value of the test data. The device is compact, movable as a whole, and eliminates reliance on large industrial pumps.

[0008] Preferably, the fixed base includes a chassis and a C-shaped column perpendicular to the chassis. A gear is mounted on the upper and lower ends of the C-shaped column, one of which is connected to a drive motor. A drive chain is installed between the two gears. A movable base block is fixed to the back of the movable base and is fixed to the drive chain. This preferred solution, through the cooperation of the drive chain and gears, achieves smooth and precise lifting of the movable base, facilitating quantitative control of the impeller's immersion depth. Furthermore, it exhibits good structural rigidity and is suitable for long-term reciprocating motion.

[0009] Preferably, the mobile platform includes a fixed platform and a moving platform. The moving platform has a mounting bracket on its surface that connects to the receiving slot. The fixed platform contains a lead screw and a guide rod that are parallel to each other. A sliding block is fixedly connected to the bottom of the moving platform. The sliding block has a threaded hole and a through hole. The lead screw passes through the threaded hole, and the guide rod passes through the through hole. A drive motor is installed at one end of the lead screw. This preferred solution uses a lead screw and guide rod mechanism to drive the movement of the receiving slot, which can precisely adjust the relative eccentric position of the receiving slot and the impeller, and realize digital control and display of displacement, improving the repeatability and accuracy of the working condition simulation.

[0010] Preferably, the console includes a storage unit for storing torque, motor power, and viscoelastic fluid rheological parameters; and a display unit for displaying torque, motor power, and viscoelastic fluid rheological parameters. This preferred solution centralizes the control and display of all key parameters on a single console, facilitating real-time monitoring and adjustment of experimental conditions by researchers, simplifying the operation process, and reducing human error.

[0011] Preferably, the top of the container is provided with an opening, and a protective cover is provided on the opening. The periphery of the protective cover is sealed to the opening, and a through hole is provided in the middle, allowing the stirring shaft to pass through and allowing adjustment of the relative position of the stirring shaft and the container. This preferred solution can effectively prevent splashing of viscoelastic fluid during high-speed stirring, thus improving experimental safety.

[0012] Preferably, the side wall of the receiving tank has an opening, and a flexible rubber sleeve is provided on the opening. The flexible rubber sleeve is conical, with its larger end sealingly connected to the opening of the receiving tank and its smaller end fitted onto the surface of the stirring shaft. This preferred solution is suitable for working conditions where the stirring shaft is arranged laterally or extends laterally. The flexible rubber sleeve can elastically deform with the movement of the stirring shaft, always maintaining a seal and preventing fluid leakage. Moreover, the structure is simple and easy to replace.

[0013] Preferably, the surface of the movable base is provided with an L-shaped mounting bracket for fixing the motor. The vertical portion of the mounting bracket has bolt holes, and the vertical portion is fixedly connected to the movable base by bolts. The outer end of the horizontal portion has a slot that fits onto the outside of the motor's output shaft. Clamping plates are symmetrically arranged on both sides of the slot, and the clamping plates elastically abut against the motor surface. This preferred solution achieves rapid positioning and secure clamping of the motor, while also providing some vibration damping, reducing operating noise, and facilitating motor disassembly and maintenance.

[0014] Preferably, a bearing housing is fitted onto the upper part of the stirring shaft, and the bearing housing is fixedly connected to the movable seat. A limiting sleeve with a diameter larger than the inner hole of the bearing housing is fixedly attached to the surface of the stirring shaft on the upper side of the bearing housing. This preferred solution provides reliable radial support and axial limiting for the stirring shaft, preventing the stirring shaft from shifting or wobbling during high-speed rotation, thus ensuring the accuracy of torque measurement and the reproducibility of the experiment.

[0015] Furthermore, the present invention also provides an experimental method based on the above-mentioned device, comprising the following steps: First procedure: Inject the viscoelastic fluid to be tested into the container tank, start the motor, and drive the impeller of the liquid ring pump to rotate. The impeller of the liquid ring pump stirs and shears the viscoelastic fluid. During the stirring process, the torque value is collected by the torque meter and the real-time power consumption of the motor is collected by the power meter. The torque value and power data are synchronously transmitted to the control console for recording and storage. The second process involves adjusting the depth of the liquid ring pump impeller into the receiving groove by controlling the moving seat, and / or adjusting the relative eccentric position of the receiving groove with respect to the liquid ring pump impeller by controlling the moving platform. After positioning, the first process is repeated to collect torque values ​​and power data under different operating conditions. The third process: During the stirring process, the valve is opened periodically to introduce the viscoelastic fluid sample that has been stirred and sheared into the rheometer. The viscoelastic parameters are measured by the rheometer and transmitted to the control console for recording and storage. The fourth step involves integrating the data collected from the first to the third steps to establish a quantitative relationship model between fluid viscoelasticity, eccentricity, immersion depth, and system power consumption, thereby assessing the energy-saving potential of viscoelastic fluids.

[0016] The beneficial effects of the above experimental method are as follows: it forms a complete closed-loop experimental process from start-up, variable operating condition testing, rheological characteristic characterization to energy-saving assessment, which can scientifically establish the quantitative relationship between fluid rheological characteristics, operating parameters and system energy consumption, providing clear and reliable guidance for the screening of high-efficiency working fluids, and filling the gap in the existing technology of lacking laboratory-scale viscoelastic fluid energy-saving testing methods.

[0017] As a preferred embodiment of the above experimental method, the viscoelastic parameters include at least one of shear viscosity, normal stress difference, storage modulus, and loss modulus. This preferred scheme can comprehensively reflect the microstructural changes of viscoelastic fluids under different shear histories, providing multi-dimensional rheological evidence for analyzing energy-saving mechanisms. Attached Figure Description

[0018] Figure 1 This is a diagram illustrating an embodiment of the overall structure of the present invention; Figure 2 This is a structural diagram of the support structure of the present invention; Figure 3 This is a structural diagram of the back side of the movable seat of the present invention; Figure 4 This is a schematic diagram of the upper structure of the mobile platform of the present invention; Figure 5 This is a schematic diagram of the lower structure of the mobile platform of the present invention; Figure 6 This is a structural diagram of an embodiment of the receiving groove of the present invention; Figure 7 This is a structural diagram of Embodiment 2 of the accommodating groove of the present invention; Figure 8 This is a structural diagram of the mounting bracket for the electric motor of the present invention; Figure 9 This is a partial structural diagram of the stirring shaft and bearing seat device of the present invention.

[0019] The components in the diagram are labeled as follows: 1. Operating platform; 2. Support; 3. Motor; 4. First coupling; 5. Torque meter; 6. Second coupling; 7. Bearing housing; 8. Stirring shaft; 9. Liquid ring pump impeller; 10. Receptacle; 11. Valve; 12. Sampling tube; 13. Rheometer; 14. Moving platform; 15. Power meter; 16. Mounting bracket; 161. Slot; 162. Clamping plate; 163. Fixing plate; 164. Threaded rod; 165. Sliding rod; 22. C-shaped column; 23. Moving seat; 24. Gear; 25. Moving base block; 141. Fixed platform; 142. Moving platform; 143. Slot; 144. Lead screw; 145. Guide rod; 146. Drive motor; 147. Sliding block; 101. Protective cover; 102. Flexible rubber sleeve. Detailed Implementation

[0020] To fully understand the purpose, features and effects of the present invention, the present invention will be described in detail through the following specific embodiments, but the present invention is not limited thereto.

[0021] See Figures 1 to 9 This invention provides an experimental apparatus for the high-shear degradation of viscoelastic fluids, comprising a containment tank 10 for accommodating the viscoelastic fluid, which simulates the internal chamber of a liquid ring pump. The apparatus employs an impeller similar to that of a liquid ring pump, referred to as a liquid ring pump impeller 9. This impeller can be a scaled-down version of an actual gas extraction pump impeller to realistically simulate its agitation effect on the fluid. The impeller is rotated by a stirring shaft 8, generating agitation and shearing effects on the viscoelastic fluid, causing the fluid's viscoelasticity to decay. The apparatus uses a rheometer 13 to monitor the decay changes of the viscoelastic fluid, thereby evaluating the energy-saving potential of viscoelastic fluids with different components.

[0022] Specifically, the viscoelastic fluid high-shear degradation experimental apparatus of the present invention includes a support 2, a liquid ring pump impeller 9 and its drive mechanism, a receiving tank 10, and data acquisition elements. The following is a detailed description of each part: The bracket 2 is installed on the operating platform 1. The bracket 2 consists of a fixed base and a movable base 23. The movable base 23 is installed on the fixed base and moves linearly along the fixed base. The movable base 23 drives the motor 3 and the impeller 9 of the liquid ring pump to move axially. The bracket 2 is the supporting slide of the overall system of this solution. The drive mechanism of the impeller 9 of the liquid ring pump is integrated on the movable base 23, forming a modular integrated body.

[0023] As one embodiment of the support 2, its fixed base includes a chassis and a C-shaped column 22 perpendicular to the chassis. A gear 24 is respectively installed at the upper and lower ends of the C-shaped column 22. One of the gears 24 is connected to a drive motor, and a drive chain is installed between the two gears 24. A movable base block 25 is fixedly connected to the back side of the movable seat 23, and the movable base block 25 is fixed to the drive chain. The control circuit of the drive motor is equipped with a height control switch to control the lifting and lowering of the movable seat 23. The displacement data of the movable seat 23 is transmitted to the control console in real time and displayed through the display unit, thereby accurately controlling the immersion depth of the liquid ring pump impeller in the receiving tank 10.

[0024] The drive mechanism includes a motor 3 mounted on one side of the support 2. The output end of the motor 3 is connected to the stirring shaft 8, and a liquid ring pump impeller 9 is mounted on the end of the stirring shaft 8. The motor 3 serves as the core power source of this device, providing stable and controllable rotational power.

[0025] As one embodiment of the fixing method of the motor 3: the surface of the movable base 23 is provided with an L-shaped mounting bracket 16, the vertical part of the mounting bracket 16 is provided with bolt holes, and the vertical part is fixedly connected to the movable base 23 by bolts; the outer end of the horizontal part of the mounting bracket 16 is provided with a slot 161, the slot 161 is fitted on the outside of the output shaft of the motor 3, and clamping plates 162 are symmetrically arranged on both sides of the slot 161, and the clamping plates 162 elastically abut against the surface of the motor 3.

[0026] Specifically, the clamping plate 162 is in contact with the motor 3. A fixing plate 163 is fixed to the surface of the mounting bracket 16 on the outer side of the clamping plate 162. A screw hole is provided in the middle of the fixing plate 163, and sliding holes are symmetrically arranged on both sides of the screw hole. A sliding rod 165 is fixed to the back side of the clamping plate 162. The other end of the sliding rod 165 is slidably disposed in the sliding hole. A spring is fitted on the sliding rod 165. The two ends of the spring are respectively connected to the clamping plate 162 and the fixing plate 163. A threaded rod 164 is threaded in the screw hole, and the end of the threaded rod 164 abuts against the back surface of the clamping plate 162. This structure uses the sliding rod 165 to stably connect the clamping plate 162 to the inner side of the fixing plate 163, and uses the threaded rod 164 to push the clamping plate 162, so that the clamping plates 162 on both sides clamp and fix the motor 3.

[0027] A bearing housing 7 is fitted onto the upper part of the stirring shaft 8. The bearing housing 7 is fixedly connected to the movable seat 23. A limiting sleeve with a diameter larger than the inner hole of the bearing housing 7 is fixedly attached to the surface of the stirring shaft 8 on the upper side of the bearing housing 7. The stirring shaft 8 is supported by the bearing housing 7, which is fastened to the side of the movable seat 23 by bolts to provide stable radial support and axial positioning, ensuring the coaxiality and stability of the stirring shaft 8 under high-speed rotation.

[0028] The receiving tank 10 is used to contain viscoelastic fluid, and the impeller 9 of the liquid ring pump is placed in the fluid. The side of the receiving tank 10 away from the stirring shaft 8 is connected to the moving platform 14, which can drive the receiving tank 10 to move perpendicular to the axial direction of the stirring shaft 8. The function of the receiving tank 10 is to simulate the stirring environment of the pump chamber of the liquid ring vacuum pump, and its shape is preferably circular.

[0029] This device integrates multiple data acquisition components, including a power meter 15, a torque meter 5, and a rheometer 13.

[0030] The electric motor 3 is electrically connected to a wattmeter 15 to collect the real-time power consumption of the electric motor 3. A torque meter 5 is positioned between the electric motor 3 and the stirring shaft 8; one end is connected to the output of the electric motor 3 via a first coupling 4, and the other end is connected to the stirring shaft 8 via a second coupling 6. It is used to monitor the torque of the stirring shaft 8. The first coupling 4 compensates for minor coaxiality deviations that may occur during installation and also has a damping effect, ensuring efficient and stable torque transmission; the second coupling 6 is used for rotary transmission and also has a damping effect.

[0031] A rheometer 13 is positioned on one side of the receiving tank 10 and is connected to the receiving tank 10 via a sampling tube 12. A valve 11 is installed on the sampling tube 12. When the valve 11 is open, a portion of the viscoelastic fluid can be drawn from the receiving tank 10 as a sample for the rheometer 13 to detect the viscoelastic parameters of the fluid. The valve 11 can be a solenoid valve and equipped with a sampling switch, which is located on the control panel.

[0032] Power meter 15, torque meter 5, and rheometer 13 are all communicatively connected to the control console. The control console includes a storage unit, a display unit, and multiple control switches: the storage unit stores torque, motor 3 power, and viscoelastic fluid rheological parameters; the display unit displays these parameters; the control switches include a control switch for the motor 3 power supply, a control switch for the motor 3 speed, and a control switch for the height of the moving base 23. Furthermore, the control console can integrate a data analysis unit to construct a quantitative relationship model between fluid viscoelasticity, eccentricity, immersion depth, and system power consumption, thereby evaluating the energy-saving potential of different viscoelastic fluids.

[0033] In one specific embodiment, the stirring shaft 8 is vertically arranged, and the motor 3, the first coupling 4, the torque meter 5, and the second coupling 6 are arranged longitudinally in sequence. The receiving tank 10 is located below the stirring shaft 8, and the liquid ring pump impeller 9 extends into the receiving tank 10 from the top. At this time, the liquid ring pump impeller 9 can be completely immersed in the viscoelastic fluid, and the fluid forms a horizontal water ring when the impeller is stirring. The vertical movement of the movable seat 23 can adjust the immersion depth of the impeller, and the horizontal movement of the moving platform 14 driving the receiving tank 10 can adjust the eccentricity of the impeller in the receiving tank 10.

[0034] To prevent splashing of the viscoelastic fluid during stirring, optionally, the top of the receiving tank 10 is provided with an opening and a protective cover 101. The periphery of the protective cover 101 is sealed to the opening, and a through hole is provided in the middle, allowing the stirring shaft 8 to pass through and allowing adjustment of the relative position of the stirring shaft 8 and the receiving tank 10. The protective cover 101 is made of transparent plastic, and a sealing ring is provided around its periphery to prevent leakage. The diameter of the through hole in the middle of the protective cover 101 is designed to allow for the movement of the receiving tank 10, preventing interference between the through hole and the stirring shaft 8. The viscoelastic fluid capacity of the receiving tank 10 is generally 30% of its total volume, so as long as the periphery of the opening is protected, the larger through hole will not cause the viscoelastic fluid to splash out.

[0035] In the above embodiment, a simple moving mechanism for the receiving trough 10 can be used. Specifically, the moving platform 14 includes a track disposed on the lower side of the receiving trough 10, the track being fixed to the operating platform 1 or chassis, and also includes a pulley fixedly installed at the bottom of the receiving trough 10. The pulley moves linearly along the track, and can optionally be adjusted by manually pushing and adjusting the receiving trough 10, thereby adjusting its relative position with the impeller 9 of the liquid ring pump. The track consists of horizontal rails and / or vertical rails. By changing the horizontal position of the receiving trough 10 on the track, the relative distance between the axis of the liquid ring pump impeller and the geometric center of the receiving trough 10 can be adjusted, that is, simulating the eccentric working condition of the liquid ring pump impeller.

[0036] In another specific implementation, The stirring shaft 8 is horizontally positioned, and the components of the drive mechanism are horizontally distributed. The receiving tank 10 is located on the side of the end of the stirring shaft 8. The impeller 9 of the liquid ring pump extends into the receiving tank 10 from the side, at which point the impeller can be partially immersed in the fluid, and the stirring causes the fluid to form a vertical water ring. The horizontal movement of the movable seat 23 can adjust the axial position of the impeller, and the movable platform 14 drives the receiving tank 10 to move horizontally or vertically to adjust the eccentricity.

[0037] To prevent splashing of the viscoelastic fluid during stirring, optionally, an opening is provided on the side wall of the receiving tank 10, and a flexible rubber sleeve 102 is provided on the opening. The flexible rubber sleeve 102 is conical, with its larger end sealingly connected to the opening of the receiving tank 10, and its smaller end fitting onto the surface of the stirring shaft 8. This flexible rubber sleeve 102 structure is also applicable to embodiments with a top opening of the receiving tank 10.

[0038] Regarding the mobile platform 14, the present invention also provides an embodiment that can be used in both of the above specific embodiments: the mobile platform 14 includes a fixed platform 141 and a mobile platform 142. The surface of the mobile platform 142 is provided with a mounting base 143 connected to the receiving groove 10. The fixed platform 141 contains a lead screw 144 and a guide rod 145 parallel to each other. A sliding block 147 is fixedly connected to the bottom of the mobile platform 142. The sliding block 147 has a threaded hole and a through hole. The lead screw 144 passes through the threaded hole, and the guide rod 145 passes through the through hole. A drive motor 146 is installed at one end of the lead screw 144. The control circuit of the drive motor 146 is connected to the control console and configured with a corresponding control switch. The display unit can display the displacement data of the receiving groove 10 in real time.

[0039] When conducting experiments using the above system, the operation method includes the following four core procedures: First step: Test initiation and data collection.

[0040] First, the viscoelastic fluid to be tested is injected into the container tank 10. Then, the motor 3 is started, and the power is transmitted through the coupling, torque meter 5, and stirring shaft 8 to drive the impeller of the liquid ring pump to rotate, stirring the fluid in the container tank 10 and simulating the working state of the liquid ring pump impeller in the pump chamber. During this process, the torque meter 5 collects the torque value of the stirring shaft 8 in real time, which is a direct key parameter for calculating the fluid resistance torque and evaluating energy consumption; at the same time, the power meter 15 records the real-time power consumption of the motor 3.

[0041] Second process: Eccentricity effect adjustment test.

[0042] To study the impact of impeller eccentricity on system performance, the relative eccentricity between the impeller of the liquid ring pump and the center of the receiving tank 10 is changed by moving the receiving tank 10 on the track. Alternatively, the immersion depth of the impeller is changed by adjusting the height adjustment knob on the support 2. After adjusting each combination of eccentricity or immersion depth, the first process is repeated to collect torque and energy consumption data under the new operating condition, thereby establishing a relationship graph between operating parameters and energy consumption.

[0043] The third step: rheological property testing.

[0044] When it is necessary to analyze the rheological properties of a fluid, the switch connecting the receiving tank 10 and the rheometer 13 is turned on, and the viscoelastic fluid sample, after being stirred under specific operating conditions, is introduced into the rheometer 13. The rheometer 13 then measures the viscoelastic parameters of the fluid sample under different shear histories, such as shear viscosity, normal stress difference, storage modulus, and loss modulus, thereby quantitatively characterizing the influence of different stirring histories on the microstructure and viscoelastic properties of the fluid.

[0045] Fourth process: Data analysis and energy-saving assessment.

[0046] Finally, the system integrates all the data collected from the above three processes. By comprehensively analyzing torque data, energy consumption data, and rheological parameters, a quantitative relationship model can be constructed between various factors such as fluid viscoelasticity, eccentric operating conditions, immersion depth, and system power consumption. Based on this model, the energy-saving potential of viscoelastic fluids with different formulations as working fluids for gas extraction pumps can be scientifically and accurately evaluated, providing a key decision-making basis for the final selection of the working fluid.

[0047] Beneficial effects of this invention: High integration and portability: The drive, transmission, stirring, measurement and operating condition adjustment units are compactly integrated into a fixed bracket to form a portable test system that can be moved as a whole, which greatly improves the flexibility of R&D work and eliminates the dependence on large industrial pumps.

[0048] Multi-parameter synchronous real-time measurement: The system creatively integrates a torque meter, an ammeter, and a rheometer into the same system, which can simultaneously and in real-time collect the stirring torque, drive energy consumption, and the fluid's viscoelastic parameters while the fluid is being stirred. This avoids the systematic errors caused by step-by-step testing and ensures the consistency and causal correlation of the data.

[0049] Precise operating condition simulation capability: Through the designed track-moving mixing system and liftable support system, it can accurately and repeatably simulate the real working conditions of the gas extraction pump impeller under different eccentricities and different immersion depths, making the study of complex operating conditions simple and easy.

[0050] A complete experimental methodology system: It provides a complete and closed-loop experimental process from startup, variable operating condition testing, rheological characteristic characterization to final energy-saving assessment. It can scientifically establish the quantitative relationship between fluid rheological characteristics, operating parameters and system energy consumption, and provide clear and reliable guidance for the optimization of working fluid.

[0051] Finally, it should be noted that the above-listed embodiments are merely preferred embodiments of the present invention. Of course, those skilled in the art can make modifications and variations to the present invention. If such modifications and variations fall within the scope of the claims of the present invention and their equivalents, they should be considered as being within the protection scope of the present invention.

Claims

1. An experimental apparatus for high-shear degradation of viscoelastic fluids, comprising a support (2) mounted on an operating platform (1), characterized in that: A motor (3) is installed on one side of the bracket (2). The output end of the motor (3) is connected to a first coupling (4). The other end of the first coupling (4) is connected to a torque meter (5). The output end of the torque meter (5) is connected to a second coupling (6). The other end of the second coupling (6) is connected to a stirring shaft (8). A liquid ring pump impeller (9) is installed at the end of the stirring shaft (8). The receiving tank (10) contains a viscoelastic fluid, and the impeller (9) of the liquid ring pump is disposed in the viscoelastic fluid; The bracket (2) consists of a fixed seat and a movable seat (23). The movable seat (23) is installed on the fixed seat and moves linearly along the fixed seat. The movable seat (23) drives the motor (3) and the impeller (9) of the liquid ring pump to move axially. The side of the receiving tank (10) away from the stirring shaft (8) is installed on the moving platform (14), and the moving platform (14) drives the receiving tank (10) to move perpendicular to the axial direction; The motor (3) is equipped with a power meter (15); a rheometer (13) is provided on one side of the accommodating tank (10), and the rheometer (13) is connected to the accommodating tank (10) through a sampling tube (12). A valve (11) is provided on the sampling tube (12). The power meter (15), torque meter (5) and rheometer (13) are all connected to the control console.

2. The experimental apparatus for high-shear degradation of viscoelastic fluids according to claim 1, characterized in that, The fixed base includes a chassis and a C-shaped column (22) perpendicular to the chassis. A gear (24) is installed at the upper end and the lower end of the C-shaped column (22). One of the gears (24) is connected to a drive motor. A drive chain is installed between the two gears (24). A movable base block (25) is fixed to the back side of the movable base (23). The movable base block (25) is fixed to the drive chain.

3. The experimental apparatus for high-shear degradation of viscoelastic fluids according to claim 1, characterized in that, The mobile platform (14) includes a fixed platform (141) and a mobile platform (142). The surface of the mobile platform (142) is provided with a card seat (143) connected to the receiving groove (10). The fixed platform (141) is provided with a lead screw (144) and a guide rod (145) that are parallel to each other. A sliding block (147) is fixedly connected to the bottom of the mobile platform (142). The sliding block (147) is provided with a threaded hole and a through hole. The lead screw (144) passes through the threaded hole, and the guide rod (145) passes through the through hole. A drive motor (146) is installed at one end of the lead screw (144).

4. The experimental apparatus for high-shear degradation of viscoelastic fluids according to claim 1, characterized in that, The console includes a storage unit for storing torque, motor (3) power and viscoelastic fluid rheological parameters; and a display unit for displaying torque, motor (3) power and viscoelastic fluid rheological parameters.

5. The experimental apparatus for high-shear degradation of viscoelastic fluids according to claim 1, characterized in that, An opening is provided at the top of the accommodating tank (10), and a protective cover (101) is provided on the opening. The periphery of the protective cover (101) is sealed to the opening, and a through hole is provided in the middle. The through hole allows the stirring shaft (8) to pass through and allows adjustment of the relative position of the stirring shaft (8) and the accommodating tank (10).

6. The experimental apparatus for high-shear degradation of viscoelastic fluids according to claim 1, characterized in that, An opening is provided on the side wall of the accommodating tank (10), and a flexible rubber sleeve (102) is provided on the opening. The flexible rubber sleeve (102) is conical, with its large end sealed to the opening of the accommodating tank (10) and its small end sleeved on the surface of the stirring shaft (8).

7. The experimental apparatus for high-shear degradation of viscoelastic fluids according to claim 1, characterized in that, The surface of the movable base (23) is provided with an L-shaped mounting bracket (16) for fixing the motor (3). The vertical part of the mounting bracket (16) is provided with bolt holes, and the vertical part is fixedly connected to the movable base (23) by bolts. The outer end of the horizontal part is provided with a slot (161), which is fitted onto the outside of the output shaft of the motor (3). Clamping plates (162) are symmetrically arranged on both sides of the slot (161), and the clamping plates (162) elastically abut against the surface of the motor (3).

8. The experimental apparatus for high-shear degradation of viscoelastic fluids according to claim 1, characterized in that, A bearing seat (7) is fitted on the upper part of the stirring shaft (8). The bearing seat (7) is fixedly connected to the movable seat (23). A limiting sleeve with a diameter larger than the inner hole of the bearing seat (7) is fixedly attached to the surface of the stirring shaft (8) on the upper side of the bearing seat (7).

9. An experimental method for the high-shear degradation experimental apparatus for viscoelastic fluids as described in claim 1, characterized in that, Includes the following steps: First process: Inject the viscoelastic fluid to be tested into the container tank (10), start the motor (3), drive the impeller (9) of the liquid ring pump (3) to rotate, the impeller (9) of the liquid ring pump (3) stirs and shears the viscoelastic fluid, during the stirring process, the torque value is collected by the torque meter (5), and the real-time power consumption of the motor (3) is collected by the power meter (15). The torque value and power data are synchronously transmitted to the control console for recording and storage. Second process: Adjust the depth of the liquid ring pump impeller (9) into the receiving groove (10) by controlling the displacement of the moving seat (23), and / or adjust the relative eccentric position of the receiving groove (10) with the liquid ring pump impeller (9) by controlling the moving platform (14). After positioning, repeat the first process and collect torque values ​​and power data under different working conditions. Third process: During the stirring process, the valve (11) is opened periodically to introduce the viscoelastic fluid sample that has been stirred and sheared into the rheometer (13). The viscoelastic parameters are measured by the rheometer (13) and the viscoelastic parameters are synchronously transmitted to the control console for recording and storage. The fourth step involves integrating the data collected from the first to the third steps to establish a quantitative relationship model between fluid viscoelasticity, eccentricity, immersion depth, and system power consumption, thereby assessing the energy-saving potential of viscoelastic fluids.

10. The experimental method of the high-shear degradation experimental apparatus for viscoelastic fluids according to claim 9, characterized in that, The viscoelastic parameters include at least one of shear viscosity, normal stress difference, storage modulus, and loss modulus.

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