A platformed integrated fluidic device

Abstract

The present application relates to the technical field of fluid mechanics experiment equipment, and discloses a platformized comprehensive fluid device, which comprises an equipment rack, a fluid circulation water supply module, a pipeline quick-release replacement module, multiple experimental pipeline components, a pressure detection module, a flow detection module, a manual-automatic control valve, a visual observation module and a data acquisition and calculation module; wherein the fluid circulation water supply module comprises a circulating water tank, a first centrifugal pump, a second centrifugal pump and an elevated tank; the circulating water tank is horizontally fixedly connected to the left side of the bottom of the equipment rack; the platformized comprehensive fluid device has high function integration degree, full experimental coverage, and more than 20 items of fluid mechanics basic experiments, such as on-way resistance, local resistance, flow meter calibration, centrifugal pump performance and fluid visualization demonstration, are integrated in a single equipment, and the device has strong universality and wide application range.

Description

Technical Field

[0001] This invention relates to the field of fluid mechanics experimental equipment technology, specifically to a platform-based integrated fluid device. Background Technology

[0002] Currently, traditional fluid mechanics experimental equipment on the market generally suffers from drawbacks such as limited functionality, cumbersome pipe installation and disassembly, disorganized storage of spare pipes, and low levels of automation. Most experimental equipment can only complete a single type of experiment and cannot simultaneously perform multiple experiments such as friction resistance, local resistance, flow meter calibration, centrifugal pump performance, and fluid visualization demonstration; at the same time, the valves of conventional equipment are mostly manually adjustable, resulting in low control precision and making it impossible to achieve automated and precise control.

[0003] Furthermore, existing equipment struggles to simultaneously and clearly demonstrate multiple flow regimes, including laminar, transitional, and turbulent flow. Visualization of dynamic and static pressure energy conversion, irreversible energy loss, and localized abrupt changes in flow fields is poor. It also lacks sufficient experimental measurement parameters and verification dimensions, failing to meet the demands of modern comprehensive fluid mechanics teaching, multi-group control experiments, and data calculation and analysis. Therefore, there is an urgent need to design a comprehensive fluid mechanics experimental device that is highly integrated, easy to assemble and disassemble, highly automated, fully covers experimental functions, and offers excellent visualization. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a platform-based integrated fluid device that solves the problems of traditional equipment having dispersed functions, cumbersome pipeline disassembly and assembly, messy storage, low automation, poor visualization, and insufficient experimental verification dimensions.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a platform-based integrated fluid device, comprising an equipment frame, a fluid circulation and water supply module, a pipeline quick-release and replacement module, various types of experimental pipeline components, a pressure detection module, a flow detection module, a manual / automatic control valve, a visualization observation module, and a data acquisition and calculation module; The fluid circulation water supply module includes a circulating water tank, a first centrifugal pump, a second centrifugal pump, and an elevated tank. The circulating water tank is horizontally fixed to the left side of the bottom of the equipment frame. The bottom left side of the circulating water tank is sealed and connected to the inlet of the first centrifugal pump, and the bottom right side of the circulating water tank is sealed and connected to the inlet of the second centrifugal pump. The bottom of the circulating water tank is also provided with a drain pipe interface for draining water after the experiment. The top side wall of the circulating water tank is provided with a temperature sensor installation interface, which can be used to install a temperature sensor to monitor the fluid temperature. The first centrifugal pump and the second centrifugal pump are fixedly connected side by side to the bottom right side of the equipment frame. The outlet end of the first centrifugal pump is sealed and connected to the inlet end of the second centrifugal pump through a switching valve. The outlet ends of the first centrifugal pump and the second centrifugal pump are sealed and merged through a parallel valve to realize the switching between series and parallel modes.

[0006] Preferably, pressure sensors are fixedly connected to the inlet and outlet ends of the first centrifugal pump and the second centrifugal pump to detect the inlet and outlet pressure of the pump body in real time. The outlet junction of the first centrifugal pump and the second centrifugal pump is sealed upward and connected to the bottom inlet of the high-level tank, and the other is sealed horizontally and connected to the turbine flow meter. They are then sealed and connected to the test pipeline and the top side wall of the circulating water tank respectively to form a complete fluid circulation loop.

[0007] Preferably, the quick-release replacement module is used for quick disassembly and assembly and neat storage of pipelines. The quick-release replacement module is horizontally and fixedly connected to the middle of the equipment frame, and is provided with no less than 4 sets of replacement interfaces for the tested pipelines. It is equipped with no less than 6 independently replaceable test pipelines, and each test pipeline has prefabricated standardized quick-release connectors at both ends to ensure sealed connection and convenient disassembly and assembly. The outer wall of the equipment frame is integrally fixed with a spare pipeline hanging bracket. The bracket has a hollow snap-fit ​​structure, which can vertically hang and store the uninstalled spare test pipelines without the pipelines touching each other. The hanging bracket can fix four spare test pipelines to the test pipeline replacement interface at the same time. The remaining spare test pipelines are snapped on the spare pipeline hanging bracket for easy access.

[0008] Preferably, the various types of experimental pipeline components are backup pipelines, including smooth straight pipes, rough straight pipes, ball valve pipelines, constriction pipelines, orifice flowmeter pipelines, and venturi flowmeter pipelines. The backup pipelines are detachably and sealed to the replacement interface of the pipe under test through standardized quick-release connectors and can be replaced as needed.

[0009] Preferably, the flow detection module includes a turbine flow meter, a first rotor flow meter, a second rotor flow meter, and a third rotor flow meter; The turbine flow meter is sealed and connected to the main pipeline between the outlet junction of the first and second centrifugal pumps and the inlet of the test pipeline to detect the total flow of the main circuit. The first rotor flow meter is sealed and connected to the outlet of the laminar flow tube, the second rotor flow meter is sealed and connected to the outlet of the Reynolds demonstration tube, and the third rotor flow meter is sealed and connected to the outlet of the Bernoulli demonstration tube to detect the flow of each branch of the demonstration pipeline.

[0010] Preferably, the visualization observation module includes a Bernoulli demonstration tube, a Reynolds demonstration tube, and a laminar flow tube, all of which are transparent acrylic tubes; The high-level tank is horizontally fixed to the upper part of the equipment frame, and an overflow trough is opened at the top of the high-level tank. The left outlet of the high-level tank is sealed and connected to the inlet end of the Bernoulli demonstration tube, the middle outlet of the high-level tank is sealed and connected to the inlet end of the Reynolds demonstration tube, and the right outlet of the high-level tank is sealed and connected to the inlet end of the laminar flow tube. It can intuitively display laminar flow, transition flow and turbulent flow, and observe the flow field and pressure changes.

[0011] Preferably, the manual / automatic integrated control valve has both manual and automatic modes, and is fixedly connected to the outlet end of the first centrifugal pump, the outlet end of the second centrifugal pump, the front and rear ends of the turbine flow meter, the inlet and outlet ends of the test pipeline, the inlet and outlet ends of each demonstration pipeline, and the branch pipeline, to accurately control the fluid flow rate and pressure.

[0012] Preferably, the pressure detection module integrates a differential pressure sensor and a pressure sensor. The differential pressure sensor is detachably connected to a preset pressure measurement point in the pipeline to detect the pipeline pressure difference; the pressure sensor is fixedly connected to the inlet and outlet ends of the first centrifugal pump and the second centrifugal pump to detect the pump body pressure.

[0013] Preferably, the data acquisition and calculation module is electrically connected to the pressure detection module, the flow detection module, and the manual / automatic control valve, and has a built-in data processing program to automatically acquire pressure, flow, and shaft power data, calculate the resistance coefficient, flow coefficient, and pump efficiency, and plot experimental curves.

[0014] (III) Beneficial Effects Compared with the prior art, the present invention provides a platform-based integrated fluid device, which has the following beneficial effects: 1. This platform-based integrated fluid dynamics device has a high degree of functional integration and covers all experiments. A single device integrates more than 20 basic fluid dynamics experiments, such as friction resistance, local resistance, flow meter calibration, centrifugal pump performance, and fluid visualization demonstration, covering all basic fluid dynamics experiments. The device is highly versatile and has a wide range of applications.

[0015] 2. This platform-based integrated fluid dynamics device boasts outstanding visualization effects, making teaching intuitive. The transparent plexiglass pipelines can visually demonstrate laminar, transitional, and turbulent flow patterns, clearly observing changes in the flow field and pressure distribution. It transforms abstract fluid theory into visible physical phenomena, resulting in excellent teaching demonstration effects. Data measurement is comprehensive and accurate, with strong verifiability. It can accurately collect various parameters such as pipeline pressure, differential pressure, flow rate, and pump shaft power, automatically completing various coefficient calculations and curve plotting. The data accuracy is high, and repeatability is good, meeting the needs of teaching and research data measurement and analysis. The control method is intelligent and widely applicable, employing a manual / automatic integrated electric control valve that balances manual hands-on teaching with precise automated control. It adapts to different teaching scenarios, exhibiting a high degree of automation, stable operation, and convenient operation.

[0016] 3. This platform-based integrated fluid dynamics device features convenient and efficient pipe assembly and disassembly, saving time and effort. Utilizing standardized quick-release connectors, the tested pipes can be disassembled and assembled without additional tools, enabling rapid replacement of multiple pipes and significantly simplifying experimental preparation processes while improving efficiency. Spare pipes are neatly stored and easily accessible. An integrated, perforated, slotted spare pipe hanging bracket on the outside of the device frame allows for independent vertical hanging of unused pipes, preventing contact and damage. Four pipes can be secured at a time, with remaining pipes neatly clipped in for easy access and orderly placement. The device boasts a robust structure and flexible mobility, employing an aluminum alloy frame with omnidirectional casters at the bottom, balancing structural stability with ease of movement. This facilitates the overall relocation and fixed placement of the device, adapting to various experimental sites. Attached Figure Description

[0017] Fig. 1 This is a schematic diagram of a platform-based integrated fluid device according to the present invention; Fig. 2 This is a schematic diagram of the structure of the first rotor flowmeter of the present invention.

[0018] In the diagram: 1. Circulating water tank; 2. First centrifugal pump; 3. Second centrifugal pump; 4. High-level tank; 5. Turbine flow meter; 6. First rotor flow meter; 7. Second rotor flow meter; 8. Third rotor flow meter; 9. Bernoulli demonstration tube; 10. Reynolds demonstration tube; 11. Laminar flow tube; 12. Backup test pipeline; 13. Backup pipeline suspension bracket; 14. Third differential pressure sensor; 15. Pressure sensor; 16. Manual / automatic control valve; 17. Data acquisition and calculation module; 18. Equipment frame; 19. First differential pressure sensor; 20. Second differential pressure sensor. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figs. 1-2 The present invention provides a new technical solution: a platform-based integrated fluid device, including an equipment frame 18, a fluid circulation water supply module, a pipeline quick-release replacement module, multiple types of experimental pipeline components, a pressure detection module, a flow detection module, a manual and automatic control valve, a visualization observation module, and a data acquisition and calculation module; The fluid circulation water supply module includes a circulating water tank 1, a first centrifugal pump 2, a second centrifugal pump 3, and an elevated tank 4. The circulating water tank 1 is horizontally fixedly connected to the bottom left side of the equipment frame 18. The bottom left side of the circulating water tank 1 is sealed and connected to the inlet end of the first centrifugal pump 2, and the bottom right side of the circulating water tank 1 is sealed and connected to the inlet end of the second centrifugal pump 3. The bottom of the circulating water tank 1 is also provided with a drain pipe interface for draining water after the experiment. The top side wall of the circulating water tank 1 is provided with a temperature sensor installation interface, which can be used to install a temperature sensor to monitor the fluid temperature. The first centrifugal pump 2 and the second centrifugal pump 3 are fixedly connected side by side to the bottom right side of the equipment frame 18. The outlet end of the first centrifugal pump 2 is sealed and connected to the inlet end of the second centrifugal pump 3 through a switching valve. The outlet ends of the first centrifugal pump 2 and the second centrifugal pump 3 are sealed and merged through a parallel valve to realize the switching between series and parallel modes. Pressure sensors are fixedly connected to the inlet and outlet ends of the first centrifugal pump 2 and the second centrifugal pump 3 to detect the inlet and outlet pressure of the pump body in real time. The outlet junction of the first centrifugal pump 2 and the second centrifugal pump 3 is sealed upward and connected to the bottom inlet of the high-level tank 4, and the other is sealed horizontally and connected to the turbine flow meter 5. They are then sealed and connected to the test pipeline 12 and the top side wall of the circulating water tank 1, forming a complete fluid circulation loop.

[0021] The quick-release replacement module is used for quick disassembly and assembly of pipelines and for neat storage. The quick-release replacement module is horizontally and fixedly connected to the middle of the equipment frame 18, with no less than 4 sets of test pipeline replacement interfaces; it is equipped with no less than 6 test pipelines that can be quickly disassembled and replaced independently, and each test pipeline has prefabricated standardized quick-release connectors at both ends to ensure sealed connection and convenient disassembly and assembly.

[0022] The outer wall of the equipment frame 18 is integrally fixed with a spare pipe hanging bracket. The bracket has a hollow snap-fit ​​structure, which can vertically hang and store the uninstalled spare test pipes 12 without the pipes touching each other. The hanging bracket can fix four spare test pipes 12 to the test pipe replacement interface at the same time. The remaining spare test pipes 12 are snapped on the spare pipe hanging bracket for easy access.

[0023] The various test piping components are the test piping 12, including smooth straight pipe, rough straight pipe, ball valve piping, constriction piping, orifice flow meter piping and venturi flow meter piping. The test piping 12 is detachably and sealed to the replacement interface of the pipe under test through standardized quick-release connectors and can be replaced as needed.

[0024] The flow detection module includes a turbine flow meter 5, a first rotor flow meter 6, a second rotor flow meter 7, and a third rotor flow meter 8.

[0025] Turbine flow meter 5 is sealed and connected to the main pipeline between the outlet junction of the first centrifugal pump 2 and the second centrifugal pump 3 and the inlet of the test pipeline 12 to detect the total flow of the main circuit. First rotor flow meter 6 is sealed and connected to the outlet of laminar flow pipe 11. Second rotor flow meter 7 is sealed and connected to the outlet of Reynolds demonstration pipe 10. Third rotor flow meter 8 is sealed and connected to the outlet of Bernoulli demonstration pipe 9 to detect the flow of each branch of the demonstration pipeline.

[0026] The visualization observation module includes Bernoulli demonstration tube 9, Reynolds demonstration tube 10, and laminar flow tube 11, all of which are transparent acrylic tubes.

[0027] The high-level tank 4 is horizontally fixed to the upper part of the equipment frame 18, and an overflow trough is opened at the top of the high-level tank 4. The left outlet of the high-level tank 4 is sealed and connected to the inlet end of the Bernoulli demonstration tube 9, the middle outlet of the high-level tank 4 is sealed and connected to the inlet end of the Reynolds demonstration tube 10, and the right outlet of the high-level tank 4 is sealed and connected to the inlet end of the laminar flow tube 11. It can intuitively display laminar flow, transition flow and turbulent flow, and observe the flow field and pressure changes.

[0028] The manual / automatic control valve has both manual and automatic modes and is fixedly connected to the outlet end of the first centrifugal pump 2, the outlet end of the second centrifugal pump 3, the front and rear ends of the turbine flow meter 5, the inlet and outlet ends of the test pipeline 12, the inlet and outlet ends of each demonstration pipeline, and the branch pipelines, so as to accurately control the fluid flow rate and pressure.

[0029] The pressure detection module integrates a differential pressure sensor and a pressure sensor. The differential pressure sensor is detachably connected to a preset pressure measurement point on the test pipeline 12 to detect the pipeline pressure difference; the pressure sensor is fixedly connected to the inlet and outlet ends of the first centrifugal pump 2 and the second centrifugal pump 3 to detect the pump body pressure. The differential pressure sensor includes a first differential pressure sensor 19, a second differential pressure sensor 20, and a third differential pressure sensor 14.

[0030] The data acquisition and calculation module is electrically connected to the pressure detection module, flow detection module, and manual / automatic control valve. It has a built-in data processing program that automatically collects data such as pressure, flow rate, and shaft power, calculates the resistance coefficient, flow coefficient, and pump efficiency, and plots experimental curves.

[0031] Furthermore, friction resistance testing can be performed: the friction coefficient λ of a smooth, straight circular pipe and a rough, straight pipe under laminar and turbulent flow conditions can be measured, and the λ-Re relationship curve can be plotted.

[0032] Local resistance test: The local resistance coefficient ζ of the sudden constriction pipeline and ball valve was determined to verify the relationship between ζ and Reynolds number.

[0033] Flow meter calibration: Integrated orifice plate flow meter, Venturi flow meter, measure flow coefficient and permanent pressure loss, and verify the relationship between flow coefficient and Reynolds number.

[0034] Pump characteristic test: Under constant speed, the head, shaft power and efficiency of the first centrifugal pump 2 and the second centrifugal pump 3 were measured, and the pump characteristic curves and pipeline characteristic curves were plotted.

[0035] Visualization demonstration: Transparent pipeline displays long-distance laminar flow streamlines, laminar sublayer, transition flow, and turbulent flow, allowing observation of sudden expansion, contraction, changes in height and pipe diameter, and pressure changes at Pitot tube measuring points.

[0036] Principle verification: It can verify Bernoulli's equation, the interconversion of static pressure energy and kinetic energy, the irreversibility of energy loss, the change of pressure head along the friction, and the distribution law of static pressure in the cross section.

[0037] Automatic control: All main control valves adopt a manual-automatic integrated structure, which can be operated manually or electrically controlled for automatic adjustment.

[0038] Furthermore, when using the device, before operation, confirm that all manual and automatic control valves are closed, and that the pipeline connections are sealed without leakage. According to the experimental content, connect the corresponding test pipeline 12 to the test pipeline replacement interface through the standardized quick-release connector, and then accurately connect the pressure measuring hose of the corresponding differential pressure sensor to the preset pressure measuring point of each pipeline.

[0039] Turn on the main power supply, control power supply, and matching computer of the device in sequence, start the data acquisition and calculation software, click the start experiment button on the software interface, start the first centrifugal pump 2 and the second centrifugal pump 3, observe the reading of the pressure sensor after the pump, when the reading increases significantly and is greater than 0.15MPa, confirm that the first centrifugal pump 2 and the second centrifugal pump 3 have started normally and no air binding phenomenon has occurred.

[0040] Smooth tube resistance measurement: In the data acquisition and calculation software interface, select the smooth pipe friction resistance measurement experiment. Open the manual / automatic control valve at the inlet and outlet of the smooth straight pipe, start the first centrifugal pump 2 and the second centrifugal pump 3, slowly open the main flow regulating valve, and then open the exhaust switching valve of the smooth straight pipe and the exhaust valve of the corresponding differential pressure sensor. Continue to exhaust for about 1 minute. After observing that there are no air bubbles remaining in the pressure tapping pipe, first close the exhaust valve of the differential pressure sensor, then close the main flow regulating valve, and gradually open the main flow regulating valve. Adjust the flow rate according to the real-time reading of the turbine flow meter 5, and control the flow rate sequentially at the maximum cubic meters per hour of 1.2, 1.8, 2.5, 3.5, 4.5, and 5.5. After each flow rate is adjusted to a stable value, collect the corresponding experimental data through the software. After the experiment is completed, close the main flow regulating valve, and then close the manual / automatic control valve at the inlet and outlet of the smooth straight pipe.

[0041] Rough pipe resistance measurement: In the data acquisition and calculation software interface, select the rough pipe friction resistance measurement experiment. Open the manual / automatic control valve at the inlet and outlet of the rough straight pipe, start the first centrifugal pump 2 and the second centrifugal pump 3, slowly open the main flow regulating valve, and then open the exhaust switching valve of the rough straight pipe and the exhaust valve of the corresponding differential pressure sensor. Continue to exhaust for about 1 minute. After observing that there are no air bubbles left in the pressure tapping pipe, first close the exhaust valve of the differential pressure sensor, then close the main flow regulating valve, and gradually open the main flow regulating valve. Adjust the flow rate according to the real-time reading of the turbine flow meter 5, and control the flow rate at the maximum cubic meters per hour of 1.2, 1.8, 2.5, 3.5, and 4.5 cubic meters per hour in sequence. After each flow rate is adjusted to a stable value, collect the corresponding experimental data through the software. After the experiment is completed, close the main flow regulating valve, and then close the manual / automatic control valve at the inlet and outlet of the rough straight pipe.

[0042] Ball valve local resistance measurement: In the data acquisition and calculation software interface, select the ball valve local resistance measurement experiment. Check if the ball valve pipeline pressure measurement point connection is correct. Confirm that the middle pressure measurement point is connected to the second differential pressure sensor 20 and the two side pressure measurement points are connected to the third differential pressure sensor 14. After confirming that everything is correct, open the manual / automatic control valve at the inlet and outlet of the ball valve pipeline, start the first centrifugal pump 2 and the second centrifugal pump 3, slowly open the main flow regulating valve, and then open the exhaust switching valve of the ball valve pipeline and the exhaust valves of the second differential pressure sensor 20 and the two side pressure measurement points connected to the third differential pressure sensor 14. Continue to exhaust for about 1 minute. After observing that there are no air bubbles remaining in the pressure tapping pipe, first close the exhaust valves of the second differential pressure sensor 20 and the pressure measuring points on both sides connected to the third differential pressure sensor 14, then close the main flow regulating valve, and gradually open the main flow regulating valve. Adjust the flow rate according to the real-time reading of the turbine flow meter 5, and control the flow rate at 2, 2.8, 3.5, 4.5 and 5 maximum cubic meters per hour in sequence. After each flow rate is adjusted to a stable level, collect the corresponding experimental data through software. After the experiment is completed, close the main flow regulating valve, and then close the manual and automatic control valves at the inlet and outlet of the ball valve pipeline.

[0043] Measurement of local resistance in a constricted pipeline: In the data acquisition and calculation software interface, select the local resistance measurement test item for the sudden constriction pipeline. Check if the pressure measurement points of the sudden constriction pipeline are connected correctly. Confirm that the middle pressure measurement point is connected to the second differential pressure sensor 20 and the pressure measurement points on both sides are connected to the third differential pressure sensor 14. After confirming that everything is correct, open the manual / automatic control valve at the inlet and outlet of the sudden constriction pipeline, start the first centrifugal pump 2 and the second centrifugal pump 3, slowly open the main flow regulating valve, and then open the exhaust switching valve of the sudden constriction pipeline and the exhaust valves of the second differential pressure sensor 20 and the pressure measurement points on both sides connected to the third differential pressure sensor 14. After venting for about 1 minute and observing that there are no air bubbles remaining in the pressure tapping pipe, first close the exhaust valve of the second differential pressure sensor 20 and the third differential pressure sensor 14 connected to the pressure measuring points on both sides, then close the main flow regulating valve, and gradually open the main flow regulating valve. Adjust the flow rate according to the real-time reading of the turbine flow meter 5, and control the flow rate at the maximum of 3, 4, 5 and 6 cubic meters per hour in sequence. After each flow rate is adjusted to a stable level, collect the corresponding experimental data through the software. After the experiment is completed, close the main flow regulating valve, and then close the manual and automatic control valves at the inlet and outlet of the constriction pipe.

[0044] Flowmeter calibration: In the data acquisition and calculation software interface, select the flow meter calibration experiment item. Connect the Venturi flow meter pipeline to the test pipe replacement interface, connect the second differential pressure sensor 20, and connect the pressure measuring points on both sides to the third differential pressure sensor 14 pressure measuring hose. Start the first centrifugal pump 2 and the second centrifugal pump 3. Slowly open the main flow regulating valve, open the Venturi tube exhaust switching valve and the exhaust valve of the second differential pressure sensor 20 and the pressure measuring points on both sides connected to the third differential pressure sensor 14. Exhaust for 1 minute. After there are no air bubbles in the pressure tapping tube, close the exhaust valve and the flow regulating valve. Gradually open the flow regulating valve and control the flow rate sequentially at 2, 2.8, 3.5, 4.5, 5, and 5.5 cubic meters per hour. If it is impossible to reach 5.5 cubic meters per hour, record the data with the flow regulating valve fully open. While collecting the data, connect the flow meter permanent pressure measuring hole to the pressure measuring points on both sides connected to the third differential pressure sensor 14 to measure the permanent pressure loss. After the Venturi flow meter calibration is completed, close the first centrifugal pump 2 and the second centrifugal pump 3. Replace the venturi tube with an orifice plate tube, repeat the venting operation, and gradually open the flow regulating valve to control the flow rate sequentially at 2, 2.8, 3.5, 4.5, 5, 5.5, and the maximum cubic meters per hour. Collect data and measure the permanent pressure loss. After the experiment is completed, close the flow regulating valve and the on / off valve of the pipeline under test.

[0045] Laminar flow pipeline measurement: In the data acquisition and calculation software interface, select the laminar flow pipeline measurement experiment project, start the first centrifugal pump 2 and the second centrifugal pump 3, adjust the valve to fill the high-level tank 4 with water and maintain a stable overflow state, open the manual and automatic control valves at the inlet and outlet of the laminar flow pipe 11 and the exhaust valve of the U-shaped differential pressure gauge, and after the U-shaped differential pressure gauge is filled with water, open the laminar flow rate regulating valve and the exhaust valve of the first differential pressure sensor 19, observe each exhaust pipeline until the air bubbles are completely discharged, and then close the exhaust valve of the first differential pressure sensor 19, the laminar flow rate regulating valve, and the inlet and outlet valves of the laminar flow pipe 11 in sequence. Slowly open the laminar flow rate regulating valve, adjust the water level height on both sides of the U-shaped differential pressure gauge to the 0 mark, and close the laminar flow rate regulating valve. Finally, close the U-shaped differential pressure gauge exhaust valve, open the manual / automatic control valve at the inlet and outlet of laminar flow pipe 11, and gradually adjust the laminar flow rate regulating valve to carry out the measurement. The flow rate is directly read by the first rotor flow meter 6, and the data is manually entered into the data acquisition and calculation software table for calculation. When inputting data, the unit needs to be converted. The software calculation is in cubic meters per hour. After the experiment is completed, close the laminar flow rate regulating valve and the manual / automatic control valve at the inlet and outlet of laminar flow pipe 11.

[0046] Reynolds demonstration experiment: Fully open the flow regulating valve and the outlet valve, purge the air bubbles in the pipeline, and then close the vent valve. Inject the prepared 1:50 red ink into the ink storage tank, adjust the valve to control the red ink flow rate, slowly adjust the valve, observe and record the different flow states of the red ink with the water flow and the corresponding flow rate, calculate the Reynolds number under different flow conditions, adjust the valve to the laminar flow state, close the valve, inject a large amount of red ink into the bell mouth, open the valve to observe the velocity distribution in laminar flow, adjust the flow rate to the maximum, and observe the velocity distribution in turbulent flow.

[0047] Bernoulli's demonstration experiment: Open the outlet valve and flow regulating valve, and observe the pipeline and each pressure measuring point one by one to see if there are air bubbles. If there are air bubbles, they can be vented through the air vents at both ends of the pipeline, or the air bubbles can be vented by squeezing the silicone hose at the bottom of the pressure tap when the flow is at its minimum. Then observe the experimental phenomena and record the data to verify the relevant laws of Bernoulli's equation.

[0048] Centrifugal pump characteristic curve determination: In the data acquisition and calculation software interface, select the centrifugal pump characteristic curve measurement experiment. Fully open the flow regulating valve, and after purging the air bubbles in the pressure tapping pipe, gradually adjust the flow regulating valve. Each adjustment is based on the change in the reading of turbine flow meter 5. Control the flow rate sequentially at 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, and the maximum cubic meters per hour. After each flow rate stabilizes, record the pump body inlet and outlet pressure, shaft power, efficiency, and other data. After the experiment is completed, close the flow regulating valve and the first centrifugal pump 2 and the second centrifugal pump 3.

[0049] Pipeline performance curve determination: For low-resistance pipeline performance testing, there is no need to replace the backup pipeline 12. Fully open the flow regulating valve and gradually adjust the speed of the first centrifugal pump 2 and the second centrifugal pump 3 from high to low. The speed is based on the change in the reading of the turbine flow meter 5. Record the inlet and outlet pressures of the pump body at different flow rates. For high-resistance pipeline performance testing, start the first centrifugal pump 2 and the second centrifugal pump 3, adjust the flow rate to about 4 cubic meters per hour, and then fix the valve. Adjust the pump speed from high to low and record the corresponding inlet and outlet pressures. After the experiment is completed, close the flow regulating valve and the first centrifugal pump 2 and the second centrifugal pump 3.

[0050] Centrifugal pumps in series and parallel operation: Open the series valve and close the parallel valve to form a series circuit between the first centrifugal pump 2 and the second centrifugal pump 3. Start both centrifugal pumps to exhaust air. Open the outlet flow regulating valve to purge air bubbles from the pipeline and then close the regulating valve. Slowly open the regulating valve to control the flow rate sequentially at 0, 2, 4, 6... the maximum cubic meters per hour. Record the flow rate and differential pressure data. After completion, close the regulating valve and stop the pumps. Close the series valve and open the parallel valve to form a parallel circuit between the two centrifugal pumps. Start the pumps to exhaust air. Open the outlet regulating valve to purge air bubbles and then close it. Slowly open the regulating valve to adjust the flow rate. Record the data and then close the regulating valve and stop the pumps.

[0051] Parking at the end of the experiment: After all experiments are completed, close all manual / automatic control valves, stop the operation of the first centrifugal pump 2 and the second centrifugal pump 3, exit the data acquisition and calculation software, shut down the supporting computer, and finally turn off the device control power supply and the main unit power supply.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A platform-based integrated fluid device, characterized in that: It includes an equipment rack (18), a fluid circulation water supply module, a pipeline quick-release replacement module, various types of experimental pipeline components, a pressure detection module, a flow detection module, a manual / automatic control valve, a visualization observation module, and a data acquisition and calculation module; The fluid circulation water supply module includes a circulating water tank (1), a first centrifugal pump (2), a second centrifugal pump (3), and a high-level tank (4). The circulating water tank (1) is horizontally fixed to the bottom left side of the equipment frame (18). The bottom left side of the circulating water tank (1) is sealed and connected to the inlet end of the first centrifugal pump (2). The bottom right side of the circulating water tank (1) is sealed and connected to the inlet end of the second centrifugal pump (3). The bottom of the circulating water tank (1) is also provided with a drain pipe interface for draining water after the experiment. A temperature sensor installation interface is provided on the top side wall of the circulating water tank (1), and a temperature sensor can be installed to monitor the fluid temperature. The first centrifugal pump (2) and the second centrifugal pump (3) are fixedly connected side by side to the bottom right side of the equipment frame (18). The outlet end of the first centrifugal pump (2) is sealed and connected to the inlet end of the second centrifugal pump (3) through a switching valve. The outlet ends of the first centrifugal pump (2) and the second centrifugal pump (3) are sealed and merged through a parallel valve to realize the switching between series and parallel modes.

2. The platform-based integrated fluid device according to claim 1, characterized in that: Pressure sensors are fixedly connected to the inlet and outlet ends of the first centrifugal pump (2) and the second centrifugal pump (3) to detect the inlet and outlet pressure of the pump body in real time. The outlet junction of the first centrifugal pump (2) and the second centrifugal pump (3) is sealed upward and connected to the bottom inlet of the high-level tank (4), and the other is sealed horizontally and connected to the turbine flow meter (5). Then, the two are sealed and connected to the test pipeline (12) and the top side wall of the circulating water tank (1) respectively to form a complete fluid circulation loop.

3. The platform-based integrated fluid device according to claim 1, characterized in that: The quick-release replacement module is used for quick disassembly and assembly of pipelines and neat storage. The quick-release replacement module is horizontally and fixedly connected to the middle of the equipment frame (18), and is provided with no less than 4 sets of replacement interfaces for the tested pipes. It is equipped with no less than 6 independently replaceable test pipelines, and each test pipeline has prefabricated standardized quick-release connectors at both ends to ensure sealed connection and convenient disassembly and assembly. The outer wall of the equipment frame (18) is integrally fixed with a spare pipe hanging bracket. The bracket has a hollow snap-fit ​​structure and can vertically hang and store the uninstalled spare test pipes (12) without the pipes touching each other. The hanging bracket can fix four spare test pipes (12) to the test pipe replacement interface at the same time. The remaining spare test pipes (12) are snapped and placed on the spare pipe hanging bracket for easy access.

4. The platform-based integrated fluid device according to claim 1, characterized in that: The various types of experimental pipeline components are test pipelines (12), including smooth straight pipes, rough straight pipes, ball valve pipelines, constriction pipelines, orifice flow meter pipelines and venturi flow meter pipelines. The test pipelines (12) are detachably and sealed to the replacement interface of the pipe under test through standardized quick-release connectors and can be replaced as needed.

5. The platform-based integrated fluid device according to claim 1, characterized in that: The flow detection module includes a turbine flow meter (5), a first rotor flow meter (6), a second rotor flow meter (7), and a third rotor flow meter (8). The turbine flow meter (5) is sealed and connected to the main pipeline between the outlet junction of the first centrifugal pump (2) and the second centrifugal pump (3) and the inlet of the test pipeline (12) to detect the total flow of the main circuit. The first rotor flow meter (6) is sealed and connected to the outlet of the laminar flow pipe (11). The second rotor flow meter (7) is sealed and connected to the outlet of the Reynolds demonstration pipe (10). The third rotor flow meter (8) is sealed and connected to the outlet of the Bernoulli demonstration pipe (9) to detect the flow of each branch of the demonstration pipeline.

6. The platform-based integrated fluid device according to claim 1, characterized in that: The visualization observation module includes a Bernoulli demonstration tube (9), a Reynolds demonstration tube (10), and a laminar flow tube (11), all of which are transparent organic glass tubes; The high-level tank (4) is horizontally fixed to the upper part of the equipment frame (18). An overflow tank is opened at the top of the high-level tank (4). The left outlet of the high-level tank (4) is sealed and connected to the inlet end of the Bernoulli demonstration tube (9). The middle outlet of the high-level tank (4) is sealed and connected to the inlet end of the Reynolds demonstration tube (10). The right outlet of the high-level tank (4) is sealed and connected to the inlet end of the laminar flow tube (11). Laminar flow, transition flow and turbulent flow can be visually displayed, and the flow field and pressure changes can be observed.

7. The platform-based integrated fluid device according to claim 1, characterized in that: The manual / automatic integrated control valve has both manual and automatic modes and is fixedly connected to the outlet end of the first centrifugal pump (2), the second centrifugal pump (3), the front and rear ends of the turbine flow meter (5), the inlet and outlet ends of the test pipeline (12), the inlet and outlet ends of each demonstration pipeline and the branch pipeline, so as to accurately control the fluid flow rate and pressure.

8. The platform-based integrated fluid device according to claim 1, characterized in that: The pressure detection module integrates a differential pressure sensor and a pressure sensor. The differential pressure sensor is detachably connected to a preset pressure measurement point on the test pipeline (12) to detect the pipeline pressure difference. The pressure sensor is fixedly connected to the inlet and outlet ends of the first centrifugal pump (2) and the second centrifugal pump (3) to detect the pump body pressure. The differential pressure sensor includes a first differential pressure sensor (19), a second differential pressure sensor (20), and a third differential pressure sensor (14).

9. A platform-based integrated fluid device according to claim 1, characterized in that: The data acquisition and calculation module is electrically connected to the pressure detection module, the flow detection module, and the manual / automatic control valve. It has a built-in data processing program that automatically collects pressure, flow, and shaft power data, calculates the resistance coefficient, flow coefficient, and pump efficiency, and plots experimental curves.

Images