A multifunctional pump test device

Abstract

The present invention provides a multifunctional pump testing device, comprising a centrifugal pump, a main circulation pipeline, a particle delivery device, a swirl generator, and an open water tank. The swirl generator is submerged in the open water tank, and the centrifugal pump's inlet and outlet form a closed loop through the main circulation pipeline. The particle delivery device is connected to the centrifugal pump's inlet for adding solid phases. Part of the main circulation pipeline passes through the open water tank. A bypass is provided on the main circulation pipeline, forming a return line with the swirl generator for adjusting the concentration of solid phases in the main circulation pipeline. The present invention enables the recovery and reuse of test materials, reducing environmental pollution while improving testing efficiency.

Description

Technical Field

[0001] The invention relates to the field of single-phase flow / solid-liquid two-phase flow pump testing, in particular to a multifunctional pump testing device. Background Art

[0002] Internal flow tests and external characteristic tests for single-phase flow and solid-liquid two-phase flow pumps are important means of testing pump performance. Especially in conditions involving solid particles, precise control of solid particle concentration and uniform entry into the centrifugal pump are prerequisites for ensuring accurate test data.

[0003] When adjusting from a high concentration to a low concentration, the existing test system needs to release all the mixed solution and filter out the solid particles to reduce the concentration, which will result in waste of test materials and reduced efficiency. At the same time, a stirring device is required to ensure that the particle concentration entering the pump remains at the set value, which will also increase power consumption and the cost of the required particles. The solution entering the pipeline during stirring will carry a certain number of bubbles, which will increase the error of the test data. In addition, since the particles will settle in the pipeline before entering the pump, the experiment will be inaccurate.

[0004] Therefore, there is an urgent need for a multifunctional pump test device that can reduce costs, adjust concentration, and mix evenly. Summary of the Invention

[0005] In response to the deficiencies in the prior art, the present invention provides a multifunctional pump test device that can adjust the concentration of particulate solids in real time according to test requirements, thereby enabling the recycling and reuse of test materials, reducing environmental pollution and improving test efficiency.

[0006] The present invention achieves the above technical objectives through the following technical means.

[0007] A multifunctional pump test device includes a centrifugal pump, a main circulation pipeline, a particle delivery device, a swirl generator and an open water tank;

[0008] The swirl generator is immersed in an open water tank, and the inlet and outlet of the centrifugal pump form a closed loop through the main circulation pipeline; the particle delivery device is connected to the inlet of the centrifugal pump for adding solid phase; part of the main circulation pipeline passes through the open water tank; a bypass is provided on the main circulation pipeline, forming a return pipeline with the swirl generator, for adjusting the concentration of the solid phase in the main circulation pipeline.

[0009] Furthermore, the swirl generator includes an overflow pipe, a swirl section, a solid storage tank and an inlet pipe; an inlet pipe is provided on the side wall of the column section of the swirl section, and the inlet pipe is connected to the first bypass on the main circulation pipeline; an overflow pipe is provided on the top of the swirl section, and the overflow pipe is connected to the second bypass on the main circulation pipeline; the bottom of the conical section of the swirl section is connected to the solid storage tank through an underflow pipe; a sensor is provided in the solid storage tank for measuring the mass of the particles; the underflow pipe is connected to the third bypass on the main circulation pipeline; the inlet pipe is located below the liquid level of the open water tank.

[0010] Furthermore, a three-way valve is provided between the first bypass and the main circulation pipeline, an overflow pipe valve is installed on the second bypass, a second solenoid valve is installed on the third bypass, and a first solenoid valve is provided between the underflow pipe and the solid storage tank; the switching of the three-way valve is controlled to allow particles in the main circulation pipeline to enter the cyclone generator; according to the mass of the particles entering the solid storage tank, the different states of the second solenoid valve, the first solenoid valve and the overflow pipe valve are controlled to reduce the concentration of the solid phase in the main circulation pipeline.

[0011] Furthermore, when the mass of the particles entering the solid storage tank is less than the set value, the first solenoid valve and the overflow pipe valve are controlled to open, allowing the particles to enter the solid storage tank; when the mass of the particles entering the solid storage tank is greater than or equal to the set value, the first solenoid valve and the overflow pipe valve are controlled to close, and the second solenoid valve is controlled to open, allowing the remaining particles to enter the main circulation pipeline; the particles exceeding the set value are replenished through the particle delivery device.

[0012] Furthermore, the main circulation pipeline includes a three-way valve, a first filter tube, a second filter tube and a spiral booster mixer;

[0013] The centrifugal pump outlet is connected in sequence to the three-way valve, the first filter tube, the second filter tube and the spiral supercharged mixer; one end of the second bypass is connected to the pipeline between one outlet of the three-way valve and the first filter tube; the other outlet of the three-way valve is connected to one end of the first bypass; one end of the third bypass is connected to the pipeline between the first filter tube and the second filter tube; a particle delivery device is provided between the spiral supercharged mixer and the centrifugal pump inlet;

[0014] At least one sensor is installed in the main circulation pipeline to obtain pressure and flow parameters in the pipeline.

[0015] Furthermore, the first filter tube and the second filter tube are immersed in an open water tank. The first filter tube and the second filter tube are filter tubes with porous structures, and liquid can freely enter and exit the filter tubes, so as to allow particles to flow in the pipeline without stirring.

[0016] Furthermore, the spiral supercharged mixer is a double-helix supercharged mixer, and the inlet of the spiral supercharged mixer is provided with a conical guide structure for ensuring that the particles are evenly distributed before entering the centrifugal pump.

[0017] A solid-liquid two-phase flow experimental method of a multifunctional pump test device comprises the following steps:

[0018] Inject the liquid phase into the open water tank until the liquid level is higher than the top of the swirl generator column; fill the solid storage tank with liquid;

[0019] The liquid phase is circulated in the main circulation pipeline by a centrifugal pump; the test particles and tracer particles are evenly mixed and then added to the main circulation pipeline through a particle feeding device;

[0020] When the particle concentration is higher than the target value, the three-way valve is switched to connect the centrifugal pump outlet to the first bypass, so that the mixed liquid enters the cyclone generator, and the cyclone generator realizes solid-liquid separation. The overflow pipe valve is opened, and the liquid phase returns to the main circulation pipeline through the second bypass. The first solenoid valve is controlled to open and the second solenoid valve is closed at the same time, and the solid phase enters the solid storage tank. When the particle mass entering the solid storage tank reaches the set value, the first solenoid valve is controlled to close and the second solenoid valve is opened at the same time.

[0021] When the particle concentration is lower than the target value, the particle delivery device is used to add particles of corresponding mass;

[0022] The particle concentration meets the test requirements, and the pressure and flow data of the main circulation pipeline are collected. At the same time, a high-speed camera is used to shoot the internal flow field of the centrifugal pump.

[0023] The beneficial effects of the present invention are:

[0024] 1. The multifunctional pump test device of the present invention can realize the conversion of pump testing between single-phase flow and multi-phase flow by adjusting the valve, which reduces the operation difficulty and saves the test cost.

[0025] 2. The multifunctional pump test device of the present invention can adjust the concentration of particulate solids in real time according to test requirements, thereby realizing the recycling and reuse of test materials, reducing environmental pollution and improving test efficiency.

[0026] 3. In the multifunctional pump test device described in the present invention, the first filter tube and the second filter tube are immersed in an open water tank. The first filter tube and the second filter tube are filter tubes with a porous structure, and liquid can freely flow in and out of the filter tubes, thereby avoiding the increase in the temperature of the liquid in the pipeline and reducing the number of particles used in the test. No stirring device is required, which greatly reduces the consumption of electricity and the space occupied by the test equipment.

[0027] 4. The multifunctional pump test device described in the present invention is provided with a spiral booster mixer before the particles enter the centrifugal pump, so that the particles in the inlet pipeline are evenly distributed to avoid sedimentation. The overall layout is compact, the structure is simple, and the operation is convenient. It can be used for test measurements of centrifugal pumps under multiple working conditions.

[0028] 5. In the multifunctional pump test device described in the present invention, the cyclone generator can separate solid particles from water under the action of centrifugal force. The solid particles will exchange equal volumes with the water in the solid storage tank. According to the information feedback from the ultrasonic concentration meter, if the solid storage tank has reached excess particle mass, the valve at the bottom of the solid storage tank is opened to remove the solid particles; the water will be re-entered into the filter element tube through the overflow pipe, thereby achieving real-time adjustment of the solid particle concentration during the test.

[0029] 6. The multifunctional pump test device described in the present invention has two sections of filter tubes with a porous structure design in the open water tank to ensure that all particles are present in the pipeline and will not escape from the open water tank, thereby ensuring that the concentration of test particles will not change; at the same time, the liquid water passes through the work of the centrifugal pump, so that the liquid water has a certain amount of energy and enters the open water tank. The filter tube can effectively dissipate the energy of the liquid water to reduce the impact on the test results; at the same time, the temperature of the liquid in the pipeline will increase, and the filter tube can realize the exchange of higher temperature water and lower temperature water; and the two sections of the filter tube are connected by a smooth elbow to prevent particles from being deposited at the corners. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. The drawings described below are some embodiments of the present invention. For ordinary technicians in this field, it is obvious that other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 This is a schematic diagram of the multifunctional pump testing device described in the present invention.

[0032] Figure 2 This is a schematic structural diagram of the swirl generator described in the present invention.

[0033] Figure 3 This is a schematic diagram of the inlet of the swirl generator described in the present invention.

[0034] In the picture:

[0035] 1-speed control motor; 2-axis encoder; 3-torque meter; 4-centrifugal pump; 5-outlet pressure sensor; 6-union; 7-electromagnetic flowmeter; 8-outlet valve; 9-outlet pipe; 10-three-way valve; 101-first bypass; 102-second bypass; 103-third bypass; 11-first filter tube; 12-second filter tube; 13-open water tank; 14-overflow pipe valve; 15-swirl generator; 151-overflow pipe; 152-column section; 153-cone section; 154-underflow pipe ;155-solid storage tank;156-outlet pipe;157-inlet pipe;16-first solenoid valve;17-second solenoid valve;18-ultrasonic concentration meter;19-drain valve;20-drain pipe;21-solid drainage pipe;22-solid drainage valve;23-inlet valve;24-spiral booster mixer;25-conical cylinder;26-particle delivery device;27-particle delivery device valve;28-inlet pressure sensor;29-inlet pipe;30-sampling tube;31-sampling tube valve;32-computer. DETAILED DESCRIPTION

[0036] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "axial", "radial", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0038] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0039] like Figure 1 As shown, the multifunctional pump test device of the present invention includes a centrifugal pump 4, a main circulation pipeline, a particle delivery device 22, a swirl generator 15 and an open water tank 13; the swirl generator 15 is immersed in the open water tank 13, and the inlet and outlet of the centrifugal pump 4 form a closed loop through the main circulation pipeline; the outlet of the centrifugal pump 4 is connected in sequence to the valve 6, the electromagnetic flowmeter 7, the outlet valve 8, the three-way valve 10, the first filter tube 11, the second filter tube 12, the inlet valve 23 and the spiral supercharger mixer 24; a particle delivery device 22 is provided between the spiral supercharger mixer 24 and the inlet of the centrifugal pump 4 for adding a solid phase; an outlet pressure sensor 5 is provided on the outlet of the centrifugal pump 4, and an inlet pressure sensor 28 is provided on the inlet of the centrifugal pump 4. A bypass is provided on the main circulation pipeline to form a reflux pipeline with the swirl generator 15 for adjusting the concentration of the solid phase in the main circulation pipeline. The bypass includes a first bypass 101, a second bypass 102, and a third bypass 103. One end of the second bypass 102 is connected to the pipeline between one outlet of the three-way valve 10 and the first filter tube 11; the other end of the second bypass 102 is connected to the overflow pipe 151 of the swirl generator 15; the other outlet of the three-way valve 10 is connected to one end of the first bypass 101, and the other end of the first bypass 101 is connected to the inlet of the swirl generator 15; one end of the third bypass 103 is connected to the pipeline between the first filter tube 11 and the second filter tube 12. The first filter tube 11 and the second filter tube 12 are immersed in the open water tank 13. The shell of the centrifugal pump 4 is made of transparent material, and a high-speed camera is provided at the front of the centrifugal pump 4 to capture the internal flow of the pump.

[0040] like Figure 2 and Figure 3As shown, the swirl generator 15 includes an overflow pipe 151, a swirl section, a solid storage tank 155 and an inlet pipe 157; the side wall of the column section 152 of the swirl section is provided with an inlet pipe 157, and the inlet pipe 157 is connected to the first bypass 101 on the main circulation pipeline. The top of the swirl section is provided with an overflow pipe 151, and the overflow pipe 151 is connected to the second bypass 102 on the main circulation pipeline. The bottom of the cone section 153 of the swirl section is connected to the solid storage tank 155 through an underflow pipe 154; a sensor is provided in the solid storage tank 155 for measuring the mass of the particles; the underflow pipe 154 is connected to the third bypass 103 on the main circulation pipeline; the inlet pipe 157 is located below the liquid level of the open water tank 13. A three-way valve 10 is provided between the first bypass 101 and the main circulation pipeline, an overflow pipe valve 14 is installed on the second bypass 102, a second solenoid valve 17 is installed on the third bypass 103, and a first solenoid valve 16 is provided between the underflow pipe 154 and the solid storage tank 155. The three-way valve 10 is controlled to switch so that particles in the main circulation pipeline enter the swirl generator 15. The second solenoid valve 17, the first solenoid valve 16, and the overflow pipe valve 14 are controlled in different states according to the mass of the particles entering the solid storage tank 155 to reduce the concentration of the solid phase in the main circulation pipeline. A solid discharge pipe 21 is provided at the bottom of the solid storage tank 155, and a solid discharge valve 22 is installed on the solid discharge pipe 21.

[0041] When the mass of the particles entering the solid storage tank 155 is less than the set value, the first solenoid valve 16 and the overflow pipe valve 14 are controlled to open, allowing the particles to enter the solid storage tank 155; when the mass of the particles entering the solid storage tank 155 is greater than or equal to the set value, the first solenoid valve 16 and the overflow pipe valve 14 are controlled to close, and the second solenoid valve 17 is controlled to open, allowing the remaining particles to enter the main circulation pipeline; the particles exceeding the set value are replenished through the particle feeding device 22.

[0042] The first filter tube 11 and the second filter tube 12 are filter tubes with a porous structure, and liquid can freely enter and exit the filter tubes. They are used to exchange the internal and external liquids in real time without stirring, reduce the temperature, and ensure that the particles are dispersed in the pipeline.

[0043] The spiral supercharger mixer 24 is a double-helix supercharger mixer, and a conical flow guide structure is provided at the inlet of the spiral supercharger mixer 24 to ensure that the particles are evenly distributed before entering the centrifugal pump 4.

[0044] The centrifugal pump 4 is driven by a speed-regulating motor 1 equipped with a shaft encoder 2 and a torque meter 3 for providing feedback on the impeller's rotation angle and position, as well as measuring impeller torque. A sampling tube 30 is located between the outlet valve 8 and the inlet of the three-way valve 10, for detecting particle concentration in the outlet pipe 9. A drain pipe 20 is connected to the lower right side of the open water tank 13, equipped with a drain valve 19 for opening and closing. A particle delivery device valve 27 is located at the outlet of the particle delivery device 26, and a conical cylinder 25 is installed at the inlet of the particle delivery device 26.

[0045] The particle concentration is calculated by the following formula:

[0046]

[0047] Example 1

[0048] The multifunctional pump test device of the present invention is used to conduct a single-phase flow pump external characteristic and internal flow test. The specific steps are as follows:

[0049] Step 1: Ensure that the inlet valve 23 is open and inject the liquid phase into the open water tank 13 until the liquid level is higher than the top of the swirl generator column section 152;

[0050] Step 2: Open the inlet valve 23 and the outlet valve 8, and keep the other valves closed. After ensuring that all electrical equipment is securely connected, start the speed regulating motor 1 to ensure that the centrifugal pump 4 rotates stably; switch the three-way valve 10 so that the outlet pipe 9 is connected to the first filter element pipe 11;

[0051] Step 3: Ensure that only the inlet valve 23 and the outlet valve 8 are open, and then add the tracer particles into the open water tank 13;

[0052] Step 4: After the system runs stably, use the PIV test equipment to take a preliminary picture of the flow field inside the centrifugal pump 4;

[0053] Step 5: Adjust the outlet valve 8 according to the test requirements to obtain the external characteristic data and internal flow field data under different flow conditions;

[0054] Step 6: Turn off the circuit, tidy up the test bench, close the inlet valve 23 and the outlet valve 8, open the drain valve 19, and drain all the liquid water in the open water tank 13 through the drain pipe 20. The test is completed.

[0055] Example 2

[0056] The multifunctional pump test device of the present invention is used to conduct a solid-liquid two-phase flow pump external characteristic and internal flow test. The specific steps are as follows:

[0057] Step 1: Ensure that the inlet valve 23 is open and inject the liquid phase into the open water tank 13 until the liquid level is higher than the top of the swirl generator column section 152; switch the three-way valve 10 to connect the outlet pipe 9 to the first filter element pipe 11;

[0058] Step 2: Open the inlet valve 23 and the outlet valve 8, and after ensuring that all electrical equipment is securely connected, start the speed regulating motor 1 to allow the centrifugal pump 4 to rotate stably;

[0059] Step 3: Open the valve 27 of the particle feeding device, mix the test particles and the tracer particles evenly, and then slowly add the particles and the tracer particles through the particle feeding device 27. The particles will enter the first filter tube 11, the second filter tube 12 and the spiral booster mixer 24 through the outlet pipe, and then evenly enter the centrifugal pump again;

[0060] Step 4: After the system runs stably, open the sampling valve 31, take out the sample liquid, and detect the particle concentration;

[0061] Step 5: Particle Concentration Adjustment

[0062] Step 5.1: If the particle concentration is higher than the test requirement, the three-way valve 10 is switched to connect the outlet pipe 9 to the first bypass 101, allowing the mixed liquid to enter the vortex generator 15. The overflow pipe valve 14 is opened, and the computer 32 controls the first solenoid valve 16 to open and the second solenoid valve 17 to close. The ultrasonic concentration meter 18 provides real-time feedback on the particle mass in the solid storage tank 155. If the particle mass reaches a set particle mass, the computer 32 closes the first solenoid valve 16 and opens the second solenoid valve 17, and then opens the solid discharge valve 22. The corresponding mass of particles is removed through the solid discharge pipe 21. After a period of operation, sampling and analysis are performed again through the sampling pipe 30 until the test requirements are met. Before switching the three-way valve 10, it is necessary to ensure that the solid storage tank 155 is full of liquid. In this way, the volume of particles entering the solid storage tank 155 is the same as the volume of liquid overflowing the solid storage tank 155 and entering the underflow pipe 154.

[0063] Step 5.2: If the particle concentration is lower than the test requirement, only the particles are slowly injected through the particle delivery device 26 and sampled and analyzed through the sampling tube 30 until the test requirement is met. The liquid phase fluid does not need to be replaced during the entire process of steps 5 and 6;

[0064] Step 5.3: If the particle concentration meets the test requirements, pressure data is collected through the inlet pressure sensor 28 and the outlet pressure sensor 5, and real-time flow data is recorded through the electromagnetic flowmeter 7. At the same time, the flow field inside the centrifugal pump 4 is photographed using a high-speed camera or PIV test instrument;

[0065] Step 6: Adjust the outlet valve 8 according to the test requirements to obtain the external characteristic data and internal flow field data under different flow conditions;

[0066] Step 7: After the test is completed, the three-way valve 10 is used to allow the mixed liquid to enter the cyclone generator 15. At the same time, the overflow pipe valve 14 is opened. The computer 32 opens the solenoid valve 16 and closes the solenoid valve 17. After a period of operation, the particles and the liquid water are completely separated. The particles accumulate in the solid storage tank 155, and the liquid water exists in the open water tank 13. Then, the solid discharge valve 22 is opened, and all the particles are taken out through the solid discharge pipe 21. The particles are recovered through processes such as drying and weighing.

[0067] Step 8: After the particles are taken out, open the drain valve 19 and drain all the liquid water in the open water tank 13 through the drain pipe 20;

[0068] Step 9: Turn off the circuit, tidy up the test bench, close the inlet valve 23, the particle delivery device valve 26, the sampling valve 31, the overflow pipe valve 14, the solids discharge tank valve 22 and the drain pipe valve 19, and the test is completed.

[0069] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0070] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multifunctional pump testing device, characterized in that: It includes a centrifugal pump (4), a main circulation pipeline, a particle delivery device (26), a swirl generator (15) and an open water tank (13); The swirl generator (15) is immersed in the open water tank (13), and the inlet and outlet of the centrifugal pump (4) form a closed loop through the main circulation pipeline; the particle feeding device (26) is connected to the inlet of the centrifugal pump (4) for adding solid phase; part of the main circulation pipeline passes through the open water tank (13); a bypass is provided on the main circulation pipeline to form a return pipeline with the swirl generator (15) for adjusting the concentration of the solid phase in the main circulation pipeline; The swirl generator (15) comprises an overflow pipe (151), a swirl section, a solid storage tank (155) and an inlet pipe (157); the side wall of the column section (152) of the swirl section is provided with an inlet pipe (157), the inlet pipe (157) is communicated with the first bypass (101) on the main circulation pipeline, the top of the swirl section is provided with an overflow pipe (151), the overflow pipe (151) is communicated with the second bypass (102) on the main circulation pipeline, the bottom of the cone section (153) of the swirl section is communicated with the solid storage tank (155) through an underflow pipe (154); a sensor is provided in the solid storage tank (155) for measuring the mass of particles; the underflow pipe (154) is communicated with the third bypass (103) on the main circulation pipeline; the inlet pipe (157) is located below the liquid level of the open water tank (13); The main circulation pipeline comprises a three-way valve (10), a first filter tube (11), a second filter tube (12) and a spiral supercharged mixer (24); the outlet of the centrifugal pump (4) is connected to the three-way valve (10), the first filter tube (11), the second filter tube (12) and the spiral supercharged mixer (24) in sequence; one end of the second bypass (102) is connected to the pipeline between one outlet of the three-way valve (10) and the first filter tube (11); the other outlet of the three-way valve (10) is connected to one end of the first bypass (101); one end of the third bypass (103) is connected to the pipeline between the first filter tube (11) and the second filter tube (12); a particle delivery device (26) is provided between the spiral supercharged mixer (24) and the inlet of the centrifugal pump (4); at least one sensor is installed in the main circulation pipeline for obtaining pressure and flow parameters in the pipeline; The first filter tube (11) and the second filter tube (12) are immersed in an open water tank (13). The first filter tube (11) and the second filter tube (12) are filter tubes with a porous structure, and liquid can freely enter and exit the filter tubes, so as to allow particles to flow in the pipeline without stirring.

2. The multifunctional pump testing device according to claim 1, characterized in that: A three-way valve (10) is provided between the first bypass (101) and the main circulation pipeline, an overflow pipe valve (14) is installed on the second bypass (102), a second electromagnetic valve (17) is installed on the third bypass (103), and a first electromagnetic valve (16) is provided between the underflow pipe (154) and the solid storage tank (155); the three-way valve (10) is controlled to switch so that particles in the main circulation pipeline enter the cyclone generator (15); and according to the mass of the particles entering the solid storage tank (155), the different states of the second electromagnetic valve (17), the first electromagnetic valve (16) and the overflow pipe valve (14) are controlled to reduce the concentration of the solid phase in the main circulation pipeline.

3. The multifunctional pump testing device according to claim 2, characterized in that: When the mass of particles entering the solid storage tank (155) is less than a set value, the first solenoid valve (16) and the overflow pipe valve (14) are controlled to open, allowing the particles to enter the solid storage tank (155); when the mass of particles entering the solid storage tank (155) is greater than or equal to the set value, the first solenoid valve (16) and the overflow pipe valve (14) are controlled to close, and the second solenoid valve (17) is controlled to open, allowing the remaining particles to enter the main circulation pipeline; particles exceeding the set value are replenished through the particle delivery device (26).

4. The multifunctional pump testing device according to claim 1, characterized in that: The spiral supercharged mixer (24) is a double-helix supercharged mixer, and the inlet of the spiral supercharged mixer (24) is provided with a conical flow guide structure, which is used to ensure that the particles are in a uniform distribution state before entering the centrifugal pump (4).

5. A solid-liquid two-phase flow experimental method of the multifunctional pump testing device according to claim 1, characterized in that: The steps include: Inject the liquid phase into the open water tank (13) until the liquid level is higher than the top of the swirl generator column (152); fill the solid storage tank (155) with liquid; The liquid phase is circulated in the main circulation pipeline by a centrifugal pump (4); the test particles and the tracer particles are mixed evenly and then added to the main circulation pipeline through a particle delivery device (26); and the particle concentration is detected by a sampling valve (31); When the particle concentration is higher than the target value, the three-way valve (10) is switched to connect the centrifugal pump outlet with the first bypass (101), so that the mixed liquid enters the cyclone generator (15), solid-liquid separation is achieved through the cyclone generator (15), the overflow pipe valve (14) is opened, and the liquid phase flows back to the main circulation pipeline through the second bypass (102); the first solenoid valve (16) is controlled to open and the second solenoid valve (17) is closed at the same time, and the solid phase enters the solid storage tank (155); when the mass of the particles entering the solid storage tank (155) reaches the set value, the first solenoid valve (16) is controlled to close and the second solenoid valve (17) is opened at the same time; When the particle concentration is lower than the target value, particles of corresponding mass are added through the particle delivery device (26); The particle concentration meets the test requirements, and the pressure and flow data of the main circulation pipeline are collected. At the same time, a high-speed camera is used to shoot the internal flow field of the centrifugal pump (4).

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