Water pump testing system and testing method

Abstract

The embodiment of the present application provides a water pump testing system and testing method, which belongs to the field of water pump detection technology. The water pump testing system includes a pressure-stabilizing tank, a cavitation simulation component, and a control component. The pressure-stabilizing tank is used to receive external water liquid; the cavitation simulation component includes a cavitation tank, a gas supply component, and a gas-liquid separator. The cavitation tank is used to connect the output branch pipe and the pump body under test, the gas supply component is used to input gas into the cavitation tank, and the gas-liquid separator is used to separate the water liquid and gas in the cavitation tank; the control component regulates the on-off state of the output branch pipe, and regulates the on-off state between the gas supply component and the cavitation tank, and between the gas-liquid separator and the cavitation tank. The water pump testing system provided by the embodiment of the present application can adjust the operating conditions of the pump body under test, thereby facilitating testing of different operating conditions of the pump body under test.

Description

Technical Field

[0001] The present application relates to water pump testing technology, and in particular to a water pump testing system and testing method. Background Art

[0002] Water pumps require testing of their operating parameters under different operating conditions, for example, parameters under normal operating conditions and parameters under conditions of cavitation. Water pumps include centrifugal pumps (vertical, horizontal, single-stage, multi-stage) and submersible pumps (well, small, sewage, mining, single-phase, screw), and the actual testing methods vary for each type of pump.

[0003] In the related art, different test systems are generally required to test water pumps under different operating conditions. Testing different operating conditions of water pumps usually involves measuring parameters such as flow rate, head, pressure, and cavitation margin. However, after the water pump is tested under a certain test condition, the water pump or the corresponding pipeline needs to be dismantled and reassembled to the pipeline that needs to be tested for testing. Therefore, when testing the operating parameters of the water pump under different operating conditions, the overall disassembly and assembly process is relatively complicated, and the testing efficiency is low. Summary of the Invention

[0004] The present application provides a water pump testing system and testing method, which are used to solve the technical problems in the related art of complex disassembly and assembly, time-consuming and labor-intensive testing of water pump parameters under different working conditions.

[0005] In one aspect, the present application provides a water pump testing system, comprising:

[0006] A pressure stabilizing tank is used to receive external water, and the liquid outlet end of the pressure stabilizing tank is connected to an output branch pipe;

[0007] A cavitation simulation component includes a cavitation tank, a gas supply component, and a gas-liquid separator. The cavitation tank is used to connect the output branch pipe and the pump body to be tested. The gas supply component and the gas-liquid separator are both connected to the cavitation tank. The gas supply component is used to input gas into the cavitation tank. The gas-liquid separator is used to separate the water and gas in the cavitation tank. A solenoid valve for regulating the on-off state is provided between the gas supply component and the cavitation tank, and between the gas-liquid separator and the cavitation tank.

[0008] A control component is connected to each of the solenoid valves to regulate the on-off state between the gas supply component and the cavitation tank, and between the gas-liquid separation component and the cavitation tank.

[0009] In some possible implementations, the output branch pipes include at least two output branch pipes arranged in parallel along a height direction, and the at least two output branch pipes have different diameters. Each output branch pipe is provided with a flow detection component and an on-off valve component. The flow detection component is used to detect the instantaneous flow of the output branch pipe, and the on-off valve component is used to regulate the on-off state of the output branch pipe. The flow detection component and the on-off valve component are both connected to the control assembly.

[0010] Wherein, when any one of the at least two output branches is in an open state, the other output branches are in a closed state.

[0011] In some possible implementations, the following further comprises:

[0012] a first connecting pipe, one end of which is connected to the liquid outlet of the cavitation tank and the other end of which is connected to the liquid inlet of the pump body to be tested; a first pressure equalizing chamber protruding in the radial direction is constructed on the first connecting pipe, the first pressure equalizing chamber is connected to the outside through a first exhaust valve, and an inlet pressure sensor is provided on the first connecting pipe;

[0013] A second connecting pipe has one end connected to the liquid inlet end of the pressure stabilizing tank and the other end connected to the liquid outlet end of the pump body under test. A second pressure equalizing chamber protruding radially is constructed on the second connecting pipe. The second pressure equalizing chamber is connected to the outside world through a second exhaust valve. An outlet pressure sensor is provided on the second connecting pipe.

[0014] In some possible implementations, a longitudinal detection branch pipe and a transverse detection branch pipe are further included, wherein the liquid outlet ends of the longitudinal detection branch pipe and the transverse detection branch pipe are both connected to the liquid inlet end of the pressure stabilizing tank;

[0015] The longitudinal detection branch has a first liquid inlet port arranged along the longitudinal direction, and the transverse detection branch has a second liquid inlet port arranged along the transverse direction. Either the first liquid inlet port or the second liquid inlet port is connected to the pump body to be tested through the second connecting pipe.

[0016] In some possible implementations, the following further comprises:

[0017] A liquid storage tank, wherein the liquid inlet end of the liquid storage tank is connected to two liquid infusion pipelines, each of the liquid infusion pipelines is provided with an on-off valve for regulating the on-off state, and the on-off valves are connected to the control assembly;

[0018] The liquid outlet end of one of the infusion pipelines is located between the first connecting pipe and the pump body to be tested, and the liquid inlet end of the other infusion pipeline is located between the second connecting pipe and the pump body to be tested.

[0019] In some possible implementations, the following further comprises:

[0020] a gas extraction component connected to the gas-liquid separation component, the gas extraction component being used to discharge the gas in the gas-liquid separation component;

[0021] a fluid discharge branch pipe, provided at the bottom of the gas-liquid separator, and used to connect the gas-liquid separator with the outside world, so as to discharge the fluid in the gas-liquid separator to the outside world;

[0022] Among them, a stop valve for regulating the on-off state is provided between the fluid discharge branch pipe, the gas extraction component and the gas-liquid separation component, and the stop valve is connected to the control component.

[0023] In some possible implementations, the control component includes:

[0024] At least two power distribution components with different power frequencies, the at least two power distribution components are used to supply power to the pump body under test to simulate the operating conditions of the pump body under test at different power frequencies;

[0025] At least two power distribution branches, each of which includes a circuit breaker and a contactor connected in series, each of which corresponds to a power distribution component, and the power distribution branch is configured to switch the switching status of the circuit breaker and the contactor to control the power supply status of the corresponding power distribution component.

[0026] In some possible embodiments, it further includes a liquid inlet pressure detection component, a liquid outlet pressure detection component, a torque detection component and a speed detection component. The liquid inlet pressure detection component is arranged on the liquid inlet side of the pump body to be measured, the liquid outlet pressure detection component is arranged on the liquid outlet side of the pump body to be measured, and the torque detection component and the speed detection component are connected to the pump body to be measured.

[0027] In some possible implementations, a proportional valve is connected between the cavitation tank and the gas supply component, and the cavitation tank is provided with a liquid level detection component for detecting the height of the liquid level in the cavitation tank.

[0028] On the other hand, the present application provides a testing method for a water pump testing system, which is used for any of the water pump testing systems described above, and the testing method includes:

[0029] Regulating the solenoid valve of the water pump test system to disconnect the pipeline between the gas supply component and the cavitation tank, and disconnecting the pipeline between the gas-liquid separator and the cavitation tank, so as to perform a normal working condition test of the pump body under test;

[0030] Regulating the solenoid valve of the water pump test system so that the pipeline between the gas supply component and the cavitation tank is connected and the pipeline between the gas-liquid separator and the cavitation tank is disconnected, so as to perform a cavitation working condition test on the pump body under test;

[0031] The solenoid valve of the water pump test system is regulated to disconnect the pipeline between the gas supply component and the cavitation tank, and connect the pipeline between the gas-liquid separation component and the cavitation tank, so that the cavitation working condition of the tested pump body is switched to the normal working condition.

[0032] The water pump testing system and testing method provided by the present application, in the water pump testing system, a pressure-stabilizing tank is used to provide a water source in a stable pressure state, and the pressure-stabilizing tank is connected to the pump under test through an output branch pipe and a cavitation tank, so as to meet the testing requirements of the pump under test under normal operating conditions. After the cavitation tank is injected with gas through the gas supply part, cavitation can be triggered without physically disassembling the pump body under test and the liquid level, simulating the cavitation working condition of the pump body under test, and quickly discharging the gas in the cavitation tank through the gas-liquid separation part to restore the normal working condition test environment, eliminating the tedious operation of traditional exhaust. Therefore, the on-off state of each pipeline is regulated by the control component, so that the test system can cover the test scenarios under normal working conditions, cavitation working conditions and different hydraulic working conditions, which is convenient for multi-scenario testing of the pump body under test. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0034] Figure 1 A partial connection diagram of a cavitation simulation component in a water pump test system according to an embodiment of the present application;

[0035] Figure 2 This is a partial connection diagram of a pressure-surge tank in a water pump test system according to an embodiment of the present application;

[0036] Figure 3 This is a partial connection diagram of the liquid storage tank and the pump body under test in the water pump testing system of an embodiment of the present application;

[0037] Figure 4 This is a schematic structural diagram of the first connecting pipe in the water pump testing system according to an embodiment of the present application;

[0038] Figure 5 for Figure 4 lateral cross-section of

[0039] Figure 6 This is a partial connection diagram of a pump body under test in a water pump testing system according to another embodiment of the present application;

[0040] Figure 7 This is a schematic diagram of the operating console structure of the control component in the embodiment of the present application;

[0041] Figure 8 This is a schematic diagram of the connection between the power distribution components and the power distribution branches of the control assembly in an embodiment of the present application;

[0042] Figure 9 A schematic diagram of a connection busbar between the power distribution components and the power distribution branches of the control assembly in an embodiment of the present application;

[0043] Figure 10 This is a water pump performance curve measured in the water pump testing system of an embodiment of the present application.

[0044] Description of Reference Numerals

[0045] 100, surge tank; 101, output branch pipe; 102, flow detection component; 103, on-off valve; 104, drain pipe; 105, inlet pipe; 106, temperature sensor;

[0046] 200, cavitation tank; 201, gas supply component; 202, gas-liquid separation component; 203, gas extraction component; 204, fluid discharge branch pipe; 205, magnetic flap level gauge; 206, first solenoid valve; 207, second solenoid valve; 208, third solenoid valve; 209, fourth solenoid valve;

[0047] 300, first connecting pipe; 301, first pressure equalizing chamber; 302, first exhaust valve; 303, inlet pressure sensor; 304, inlet flange; 305, outlet flange; 306, second connecting pipe; 307, outlet pressure sensor;

[0048] 401, first expander; 402, shunt bus; 403, second expander; 404, first main busbar; 405, variable frequency power supply main circuit breaker; 406, second main busbar; 407, third main busbar; 408, power circuit breaker; 410, forward contactor; 411, reverse contactor; 412, busbar clamp; 413, transformer;

[0049] 500, longitudinal detection branch pipe; 501, first liquid inlet port; 502, transverse detection branch pipe; 503, second liquid inlet port; 504, outlet pressure detection element; 505, flexible pipe; 506, electric valve; 507, reducer;

[0050] 600, liquid storage tank; 601, infusion pipeline; 602, opening and closing valve; 603, drainage pump; 604, overflow pipeline;

[0051] 700, pump body under test; 701, torque meter; 702, speed sensor;

[0052] 801, display; 802, HMI; 803, keyboard; 804, double-door cabinet;

[0053] 901. Main circuit breaker; 902. First circuit breaker; 903. Second circuit breaker; 904. First contactor; 905. Second contactor; 906. Third circuit breaker; 907. External variable frequency power supply; 908. Fourth circuit breaker; 909. Third contactor; 910. Fourth contactor; 911. Soft start.

[0054] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0056] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0057] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on this application.

[0058] The terms "first," "second," "third," "fourth," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or sequential sequence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the application described herein can, for example, be implemented in an order other than that illustrated or described herein.

[0059] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, product or apparatus.

[0060] In the related art, different test systems are generally required to test water pumps under different operating conditions. Testing different operating conditions of water pumps usually involves measuring parameters such as flow rate, head, pressure, and cavitation margin. However, after the water pump is tested under a certain test condition, the water pump or the corresponding pipeline needs to be dismantled and reassembled to the pipeline that needs to be tested for testing. Therefore, when testing the operating parameters of the water pump under different operating conditions, the overall disassembly and assembly process is relatively complicated, and the testing efficiency is low.

[0061] Based on the above related description, a water pump testing system and testing method are provided in one or more embodiments of the present application. The solutions of the embodiments of the present application are described below with reference to the accompanying drawings.

[0062] like Figure 1 and Figure 2 As shown, the water pump test system provided by the embodiment of the present application includes a pressure-surge tank 100, a cavitation simulation component and a control component, wherein the pressure-surge tank 100 is used to receive external water, and the liquid outlet end of the pressure-surge tank 100 is connected to the output branch 101; the cavitation simulation component includes a cavitation tank 200, a gas supply component 201 and a gas-liquid separator 202, the cavitation tank 200 is used to connect the output branch 101 and the pump body 700 to be tested, the gas supply component 201 and the gas-liquid separator 202 are both connected to the cavitation tank 200, and the gas supply component 201 is used to supply the cavitation tank 200 with gas. 00 input gas, the gas-liquid separator 202 is used to separate the water and gas in the cavitation tank 200; wherein, a switch valve for regulating the on-off state is provided on the output branch pipe 101, and solenoid valves for regulating the on-off state are provided between the gas supply component 201 and the cavitation tank 200, and between the gas-liquid separator 202 and the cavitation tank 200; the control component connects the switch valve and each solenoid valve to regulate the on-off state of the output branch pipe 101, and regulates the on-off state between the gas supply component 201 and the cavitation tank 200, and between the gas-liquid separator 202 and the cavitation tank 200.

[0063] It can be seen from the above description that in the embodiment of the present application, the pressure-stabilizing tank 100 is connected to the cavitation tank 200 through the output branch pipe 101, and the gas supply component 201 and the gas-liquid separation component 202 are both connected to the cavitation tank 200. Therefore, the on-off state of the output branch pipe 101 is regulated by the control component, and the on-off state between the gas supply component 201 and the cavitation tank 200, and between the gas-liquid separation component 202 and the cavitation tank 200 are regulated, so that the pump body 700 to be tested connected to the cavitation tank 200 can be flexibly switched to the cavitation working condition or the normal operating condition without changing the overall connection structure of the pump body 700 to be tested, so that the testing process is simple and convenient, and is more suitable for a variety of different testing scenarios.

[0064] In addition, by injecting gas into the cavitation tank 200 through the gas supply component 201 and adjusting the gas-liquid mixing ratio in the cavitation tank 200, different cavitation conditions of the pump body 700 under test can be simulated. Combined with the flow rate, speed, torque and other operating parameters of the pump body 700 under test, the cavitation phenomenon under the actual working conditions of the pump body 700 under test can be accurately reproduced, which is conducive to testing the anti-cavitation ability of the pump body 700 under test. After the cavitation working condition test is completed, the gas-liquid separator 202 can quickly separate the mixed fluid in the cavitation tank 200 to prevent the residual gas in the cavitation tank 200 from affecting subsequent tests, which is conducive to ensuring the consistency of the test environment of the pump body 700 under test each time and can facilitate the rapid switching of the pump body 700 under test to normal test conditions.

[0065] Pump cavitation is a phenomenon in which excessive gas content in the liquid causes pump performance degradation or even failure during operation. Net Positive Suction Head (NPSH) is a key parameter for preventing liquid cavitation in pump systems. It is divided into effective NPSH and required NPSH. Generally speaking, the effective NPSH of a pump should be greater than the required NPSH to prevent cavitation.

[0066] The NPSH calculation formula is used to determine the maximum gas content a pump can withstand during operation. Typically, basic data such as the inlet pressure, outlet pressure, and flow rate of the pump 700 under test is collected. The NPSH formula is then used to determine whether the pump 700 is experiencing cavitation. A pump performance curve is then plotted based on this test data, allowing the overall performance of the pump to be determined.

[0067] like Figure 2 As shown, in the embodiment of the present application, the pressure-stabilizing tank 100 serves as a buffer stabilizing container at the inflow end of the water pump test system, compensating for the pressure fluctuations of the external water liquid when receiving the external water liquid, thereby providing a stable input flow and water liquid pressure for the pump body 700 under test, avoiding test data deviation caused by unstable water supply.

[0068] In some embodiments, the output branch pipe 101 has at least two output branches 101 arranged in parallel along the height direction, and the diameters of the at least two output branches 101 are different. Each output branch pipe 101 is provided with a flow detection component 102 and an on-off valve component 103. The flow detection component 102 is used to detect the instantaneous flow of the output branch pipe 101, and the on-off valve component 103 is used to regulate the on-off state of the output branch pipe 101. The flow detection component 102 and the on-off valve component 103 are both connected to the control component; wherein, when any one of the at least two output branches 101 is in the open state, the other output branches 101 are in the closed state.

[0069] In the above embodiment, for example, along the height direction, the output branch pipe 101 has five to six pipes with decreasing diameters from bottom to top. Multiple output branch pipes 101 are arranged in parallel and connected in parallel to the surge tank 100. Thus, the arrangement of multiple output branch pipes 101 can cover multi-stage and wide-range testing requirements from large flow to small flow. For example, for the large-diameter branch pipe at the bottom, the extreme performance of a high-lift, large-flow pump can be tested. For the small-diameter branch pipe at the top, low-flow precision working conditions can be tested, including simulation of critical cavitation working conditions or low-power water pump testing, etc. When the test object is the same pump body 700 under test, by switching output branch pipes 101 of different diameters, the efficiency of the same pump body 700 under test at different rated flow rates can be tested, which facilitates the generation of a water pump performance curve.

[0070] If only a single pipe is set up to throttle the flow rate through a valve for flow testing, energy loss is likely to occur during the test process. By setting up and selecting multiple output branches 101, ineffective pressure drop can be effectively reduced, and the test energy efficiency of the tested pump body 700 can be improved. Therefore, each output branch 101 is provided with a flow detection component 102 and an on-off valve component 103. The flow detection component 102 can be an electromagnetic flowmeter in the relevant technology, which is used to test the instantaneous flow on the corresponding output branch 101. The on-off valve component 103 can be an on-off electric valve 506 in the relevant technology. After selecting a suitable output branch 101 to roughly adjust the test scenario, the opening of the on-off valve component 103 can be adjusted through the control component to fine-tune the flow accuracy, thereby further reducing the test error.

[0071] It should be noted that in the above embodiment, when any one of at least two output branches 101 is in an open state, the other output branches 101 are in a closed state. This means that when one of the output branches 101 is opened and connected via the on-off valve 103, the on-off valves 103 of the other output branches 101 are closed and disconnected. This design helps ensure test accuracy and prevents the loss of connection between multiple output branches 101 and the resulting impact on test results.

[0072] In the above embodiment, a drain pipe 104 is provided on the side of the surge tank 100 facing away from the output branch pipe 101, which is connected to an external drain. When the water level in the surge tank 100 is high or the surge tank 100 needs to be cleaned, the water can be drained through the drain pipe 104. When the surge tank 100 needs to be replenished, municipal tap water is delivered along the inlet pipe 105. The ball valve on the inlet pipe 105 is opened, and the booster pump on the inlet pipe 105 pressurizes the water and inputs it into the surge tank 100.

[0073] In some embodiments, as Figure 3 As shown, the water pump test system also includes a first connecting pipe 300 and a second connecting pipe 306, wherein one end of the first connecting pipe 300 is connected to the liquid outlet end of the cavitation tank 200, and the other end is connected to the liquid inlet end of the pump body 700 to be tested, and the first connecting pipe 300 is constructed with a first pressure equalizing chamber 301 protruding in the radial direction, and the first pressure equalizing chamber 301 is connected to the outside world through a first exhaust valve 302, and the first connecting pipe 300 is provided with an inlet pressure sensor 303; one end of the second connecting pipe 306 is connected to the liquid inlet end of the pressure-stabilizing tank 100, and the other end is connected to the liquid outlet end of the pump body 700 to be tested, and the second connecting pipe 306 is constructed with a second pressure equalizing chamber protruding in the radial direction, and the second pressure equalizing chamber is connected to the outside world through a second exhaust valve, and the second connecting pipe 306 is provided with an outlet pressure sensor 307.

[0074] In the above embodiment, if Figure 4 and Figure 5 As shown, the first connecting pipe 300 and the second connecting pipe 306 can adopt the same structural design. Taking the first connecting pipe 300 as an example, the first connecting pipe 300 has an inlet flange 304 for connecting to the liquid outlet end of the cavitation tank 200, and an outlet flange 305 for connecting to the liquid inlet end of the pump body 700 to be tested. When the fluid passes through the first connecting pipe 300, the fluid is squeezed into the first pressure equalizing chamber 301 through the reserved hole inside it. The first pressure equalizing chamber 301 can form a local pressure buffer area. The first pressure equalizing chamber 301 is used to absorb the pressure pulsation caused by sudden flow changes or gas-liquid mixing in the external pipeline, so that the pressure of the fluid flowing to the inlet of the pump body 700 to be tested is stable, thereby making the test pressure data more accurate. In the cavitation working condition test scenario, when there is gas in the fluid, the first exhaust valve 302 is opened to exhaust, so that the first connecting pipe 300 quickly returns to the normal liquid conveying state.

[0075] Here, during the adjustment process of the gas ratio in the cavitation tank 200, the pressure equalizing chamber design of the first connecting pipe 300 and the second connecting pipe 306 can offset the sudden pressure change of the gas-liquid mixed fluid, ensure a smooth transition of the inlet and outlet pressures of the tested pump body 700, and facilitate the capture of the critical cavitation point of the tested pump body 700.

[0076] Furthermore, in some embodiments, the water pump testing system also includes a longitudinal detection branch 500 and a transverse detection branch 502, and the liquid outlet ends of the longitudinal detection branch 500 and the transverse detection branch 502 are both connected to the liquid inlet end of the pressure regulating tank 100; the longitudinal detection branch 500 has a first liquid inlet port 501 arranged along the longitudinal direction, and the transverse detection branch 502 has a second liquid inlet port 503 arranged along the transverse direction, and any one of the first liquid inlet port 501 and the second liquid inlet port 503 is connected to the pump body 700 to be tested through the second connecting pipe 306.

[0077] like Figure 3 As shown, the longitudinal detection branch 500 and the transverse detection branch 502 in the above embodiment are used to adapt to different specifications of the pump body 700 to be tested. An outlet pressure detection member 504 is provided at the parallel node of the longitudinal detection branch 500 and the transverse detection branch 502 to detect the total pressure value of the outlet fluid. The longitudinal detection branch 500 and the transverse detection branch 502 are both provided with an electric valve 506 for regulating the on-off state. The longitudinal detection branch 500 is used to adapt to the liquid inlet of a vertical pump, reducing elbow connections and thus maintaining the stability of the gravitational potential energy of the fluid; the transverse detection branch 502 is used to adapt to the horizontal liquid inlet of a horizontal pump, avoiding local pressure loss caused by pipeline bends, which helps to ensure flow accuracy.

[0078] It should be noted that the second connecting pipe 306 and the longitudinal test branch 500, as well as the transverse test branch 502, are connected via flexible pipes 505. These flexible pipes 505 compensate for errors in connection height. Rapidly switching between the longitudinal test branch 500 and the transverse test branch 502 via the second connecting pipe 306 reduces the preparation time for testing different pump models 700. For example, when switching from a vertical pump to a horizontal pump, only the second connecting pipe 306 section and the test branch end piping need to be replaced; no adjustments to the main structure of the test system are required.

[0079] Generally, the pump body 700 to be tested is also provided with a torque meter 701 for detecting the pump torque, and a speed sensor 702 for detecting the pump speed.

[0080] In the embodiment of this application, Figure 3 As shown, the water pump testing system also includes a liquid storage tank 600, the liquid inlet end of the liquid storage tank 600 is connected to two infusion pipelines 601, each infusion pipeline 601 is provided with an opening and closing valve 602 for regulating the on-off state, and the opening and closing valves 602 are all connected to the control component; the liquid outlet end of one infusion pipeline 601 is located between the first connecting pipe 300 and the pump body 700 to be tested; the liquid inlet end of the other infusion pipeline 601 is located between the second connecting pipe 306 and the pump body 700 to be tested.

[0081] The liquid storage tank 600 in the above embodiment is used to recover and store the water flowing through the tested pump body 700. By providing a liquid infusion pipeline 601 at the inlet and outlet ends of the tested pump body 700, the remaining fluid before and after the tested pump body 700 is transported to the water storage tank for storage via a drainage pump 603. When the test system needs to replenish water, it can be replenished by drawing fluid from the water storage tank and adjusting the opening and closing state of the butterfly valve. In this way, after the test system is replenished with fluid once, the remaining fluid before and after the tested pump body 700 is recovered through the liquid storage tank 600 for secondary use, thereby recycling the fluid within the test system, achieving closed-loop testing, reducing dependence on external water sources, and saving water resources.

[0082] It should be noted that a drainage pump 603 is further provided between the liquid storage tank 600 and the infusion line 601 that inputs the pump body 700 under test. The drainage pump 603 is used to pressurize the liquid in the liquid storage tank 600 and input it into the pump body 700 under test. In some embodiments, the liquid storage tank 600 is also provided with an overflow line 604 for communication with the outside world. The overflow line 604 is connected to an external drain. When the liquid level in the liquid storage tank 600 is high and there is a risk of overflow, the overflow line 604 is opened to prevent losses caused by overflow of the liquid storage tank 600.

[0083] It should be noted that the opening and closing states of the drain pump 603, butterfly valve and overflow pipe 604 in the above embodiment are all controlled by the control component, which can be manually controlled or controlled by an automatic program. When automatic program control is used, editable logic devices in related technologies can be used, such as PLC.

[0084] like Figure 1 As shown, Figure 1 In the embodiment, the left side A end of the cavitation tank 200 is connected to the output branch 101, and the B end is connected to the pump body 700 to be tested. In the embodiment of the present application, the test system also includes a gas extraction component 203 and a fluid discharge branch 204. The gas extraction component 203 is connected to the gas-liquid separator 202, and the gas extraction component 203 is used to discharge the gas in the gas-liquid separator 202; the fluid discharge branch 204 is provided at the bottom of the gas-liquid separator 202, and the fluid discharge branch 204 is used to connect the gas-liquid separator 202 and the outside world to output the fluid in the gas-liquid separator 202 to the outside world; wherein, a shut-off valve for regulating the on-off state is provided between the fluid discharge branch 204, the gas extraction component 203 and the gas-liquid separator 202, and the shut-off valve is connected to the control component.

[0085] The gas extraction component 203 in the above embodiment can adopt a vacuum pump, the gas-liquid separation component 202 is a gas-liquid separation storage tank, the gas supply component 201 is an air compressor, and the fluid output by the pressure regulating tank 100 is transported to the cavitation tank 200 through a connecting pipeline. The bottom of the cavitation tank 200 is supported by support legs, and a magnetic flap level gauge 205 is provided on the cavitation tank 200 to display the current liquid level height.

[0086] like Figure 1 As shown, the above-mentioned stop valves are all solenoid valves. A parallel node is provided between the gas supply component 201, the gas-liquid separator 202, and the cavitation tank 200. A first solenoid valve 206 is provided between the gas supply component 201 and the parallel node, a second solenoid valve 207 is provided between the gas-liquid separator 202 and the parallel node, a third solenoid valve 208 is provided between the gas-liquid separator 202 and the gas extraction component 203, and a fourth solenoid valve 209 is provided between the cavitation tank 200 and the parallel node. When the cavitation performance of the pump body 700 under test needs to be tested, the gas supply component 201 delivers gas to the cavitation tank 200 along the gas pipeline, the first solenoid valve 206 and the fourth solenoid valve 209 are opened, and the second solenoid valve 207 and the third solenoid valve 208 are closed. The cavitation tank 200 is inflated with gas and delivered to the pump body 700 under test along with the fluid to simulate the cavitation phenomenon during on-site operation of the pump body 700 under test.

[0087] When negative pressure is detected in the test system by the pressure sensor or other detection components, the first solenoid valve 206 and the fourth solenoid valve 209 are closed, and the second solenoid valve 207 and the third solenoid valve 208 are opened. The fluid in the cavitation tank 200 is squeezed and transported to the gas-liquid separator 202, and the gas in the gas-liquid separator 202 is transported to the outside of the cavitation tank 200 through the gas extraction component 203. The fluid continues to be stored in the cavitation tank 200 to facilitate subsequent testing.

[0088] In the above-described embodiment, by connecting the gas extraction component 203 to the gas-liquid separator 202, it is possible to precisely discharge cavitation bubbles, undissolved air, and other gases accumulated in the gas-liquid separator 202, preventing the gas from re-introducing into the pump body 700 under test when switching to normal test conditions, thereby ensuring the purity of the medium during subsequent testing. Furthermore, the gas extraction component 203 and the gas supply component 201 of the cavitation tank 200 work together to form a closed-loop "gas injection-extraction-separation" test, enabling precise control of the gas-liquid ratio within the test system and simulating operating scenarios with varying cavitation intensities.

[0089] As an alternative embodiment, the above-mentioned gas extraction components 203 can be set to more than two. When the gas content in the gas-liquid separator 202 is relatively high and the operation of the gas extraction component 203 cannot meet the requirements, the exhaust can be accelerated by operating two gas extraction components 203.

[0090] It should be noted that both the gas supply component 201 and the gas extraction component 203 should be equipped with components for detecting or regulating the gas delivery ratio, such as a proportional valve or a gas concentration detector, to facilitate more accurate observation of cavitation intensity. Furthermore, a temperature sensor 106 and a pressure sensor are also provided on the pipeline between the cavitation tank 200 and the pump body 700 to detect the temperature and pressure of the fluid flowing into the pump body 700. This will not be further described in the embodiments of this application.

[0091] In some embodiments, a proportional valve is connected between the cavitation tank 200 and the gas supply component 201 , and the cavitation tank 200 is provided with a liquid level detection component for detecting the liquid level height in the cavitation tank 200 , such as a magnetic flap level gauge.

[0092] like Figure 6 As shown, in the embodiment of the present application, the water pump testing system also includes an open-loop testing unit. Specifically, the output branch pipe 101 connected to the water pool is connected to the first connecting pipe 300 through a reducer 507, the first connecting pipe 300 is connected to the pump body 700 to be tested, the outlet end of the pump body 700 to be tested is connected to the second connecting pipe 306, the second connecting pipe 306 is connected to the short circuit through a flexible pipe 505, the short circuit is fixedly connected to the flow meter through a flange, and after the other short circuit is connected to the electric valve 506, the electric valve 506 is connected to the outlet pipeline. The above-mentioned components and the pump body 700 to be tested are all on the same center line to facilitate testing the instantaneous flow of the pump body 700 to be tested. The fluid after pressurization of the pump body 700 to be tested flows into the water pool through the outlet pipeline to facilitate the reuse of the fluid.

[0093] From the above description, it can be seen that the difference between the above-mentioned open-loop test unit and the previously described test system is that the fluid does not pass through the pressure-surge tank 100, but is directly tested through an open water pool. The open-loop test unit can simulate the suction stroke scenario of the fire pump.

[0094] In some embodiments, the water pump testing system further includes a liquid inlet pressure detection component, a liquid outlet pressure detection component, a torque detection component, and a speed detection component. The liquid inlet pressure detection component is disposed on the liquid inlet side of the tested pump body 700, the liquid outlet pressure detection component is disposed on the liquid outlet side of the tested pump body 700, and the torque detection component and the speed detection component are connected to the tested pump body 700. Here, the liquid inlet pressure detection component and the liquid outlet pressure detection component can both be pressure sensors, the torque detection component can be a torque meter, and the speed detection component can be a speed sensor.

[0095] The control component in the embodiment of the present application includes at least two distribution components with different power supply frequencies, and the at least two distribution components are used to supply power to the pump body 700 under test to simulate the operating conditions of the pump body 700 under different power supply frequencies; it also includes at least two distribution branches, each distribution branch includes a circuit breaker and a contactor connected in series, and each distribution branch corresponds to a distribution component. The distribution branch is configured to switch the switching state of the circuit breaker and the contactor to control the power supply state of the corresponding distribution component.

[0096] like Figure 7 As shown, in the above embodiment, specifically, the control component includes an operating table for connecting distribution components and distribution branches, and the operating table is provided with an HMI802 type industrial touch screen in the relevant technology, and functional control and system linkage are performed through the touch buttons on the HMI802, without the need for inspection personnel to enter the test site to verify the data; its configuration system display 801 displays the real-time data of its test feedback value, and generates relevant test reports through computer calculations; the drawer-type keyboard 803 can be used for mouse operation to click on the interactive interface on the operating table, and its double-door cabinet 804 is used to store computer host and other equipment; the configuration is performed through the operation of the test personnel and the collection of on-site data, and the HMI802 system with remote control and functional testing is connected to Ethernet through the RJ45 port to realize its data interaction.

[0097] Generally speaking, the above-mentioned operating table can adopt industrial operating equipment in related technologies. The above-mentioned operating table is used to display the operating parameters of the pump body 700 under test in the test system, including the parameters of components such as the flow detection component 102, the torque meter 701, the speed sensor 702, and the pressure sensor. It is also used to control the on-off status of the solenoid valve, the on-off valve and the opening and closing valve component 602.

[0098] For example, the power distribution components in the embodiment of the present application include mains power supply, 50Hz power distribution components and 60Hz power distribution components; due to the different power supply frequencies at home and abroad, the impact on the pump body 700 under test is different. When it is necessary to simulate power supply with different power supply frequencies at home and abroad, the automatic switching can be completed by clicking the power supply frequency switch on HMI802 on the operating console.

[0099] Specifically, such as Figure 8 and Figure 9 As shown in the figure, the incoming power supply uses a cable to enter the molded case circuit breaker and then distribute the bus power. One line is powered by mains power, which is mainly used for 50Hz distribution system, and the other line is powered by variable frequency power, which is mainly used for 60Hz distribution system. The switching is operated through the distribution branch. When 50Hz power supply is required, the mains power is used for power supply. When 60Hz needs to be tested, the mains power and variable frequency power supply are automatically switched, so that the performance of each series of pumps can be tested according to the different power supply frequencies at home and abroad.

[0100] Figure 8 and Figure 9 The figure below is a schematic diagram of the switching connection of the power distribution components. Figure 8 As shown, the main circuit breaker 901 is used to connect the main incoming power supply and the busbar system for disconnection and closing. The power distributed by the busbar system to the variable frequency power supply is transmitted through the first circuit breaker 902; when it is necessary to use the 50Hz power distribution system, the second circuit breaker 903 is closed and the first contactor 904 is energized for power supply. When switching to the 60Hz power distribution system, it is necessary to disconnect the second contactor 905 and close the third circuit breaker 906 for 60Hz power supply. The 60Hz power distribution system is supplied by the external variable frequency power supply 907; when the factory test bench needs 60Hz power supply, the fourth circuit breaker 908 is closed for power transmission; when the pump under test needs to rotate forward, the third contactor 909 is energized and the fourth contactor 910 is disconnected. When testing reverse rotation, the third contactor 909 is disconnected and the fourth contactor 910 is energized. Operation is performed by clicking the function selection button on the HMI802;

[0101] In some embodiments, a high-power test pump has a certain impact on the power grid when it is directly started. The soft start 911 is configured to perform curve operation to reduce the impact on the power grid. After testing pumps under test in different power ranges, different contactors are energized, and the current on the secondary side of the mutual inductor 413 is fed back to the smart meter for real-time display, and the data is fed back to the configuration system on the operating console via RS485 communication.

[0102] When it is necessary to comply with the foreign 60Hz test, the power frequency selection switch on the test bench is used to select the power supply frequency. The 50Hz power supply circuit is closed and the 60Hz power supply circuit is opened. The 60Hz power supply is supplied by the external variable frequency power supply 907. At the same time, the 60Hz power supply of the factory test bench is supplied by the third circuit breaker 906.

[0103] Furthermore, when it is necessary to test the forward and reverse rotation of the pump under test, it is necessary to click HMI802 on the operating table to switch and select. When forward rotation is required, the third contactor 909 is closed and the fourth contactor 910 is disconnected; when testing reverse rotation, the third contactor 909 is disconnected and the fourth contactor 910 is closed. Through the interlocking of the contactors, the forward and reverse rotation control of the pump under test is realized; the busbar system is insulated and fixed in position by the busbar frame, thereby preventing the busbar system from being displaced due to vibration during operation and reducing the occurrence of accidents; after passing through the mutual inductor 413, the busbar system feeds back the current on the secondary side to the RS485 interface on the smart meter for communication, thereby realizing real-time interaction and display of its data.

[0104] As a further description supplement, Figure 9 Indicated Figure 8The corresponding busbar system connection diagram shows the first expander 401 connecting to the external power cable. The current carrying capacity of the first expander 401 meets the design functional requirements. A diverter bus 402 transmits power to the variable frequency power supply on one side and to the surge tank 100, the pump under test 700, and the cavitation tank 200 on the other. The second expander 403 connects to the cable of the variable frequency power supply, primarily providing power to the variable frequency power supply. The first main busbar 404 connects to the expander at the upper end of the 50Hz power circuit breaker. After the contactor is engaged, it outputs to the second main busbar 406, which is primarily used for the 50Hz power distribution system. The variable frequency power supply main circuit breaker 405 transmits current to the 50Hz power distribution system. After the contactor is engaged, it outputs to the third main busbar 407, which is primarily used for switching and transmitting current to the 60Hz power distribution system. The power circuit breaker 408 supplies power to the factory test bench.

[0105] When starting a high-power pump, soft starter 911 controls forward rotation, closing forward contactor 410 and opening reverse contactor 411. Reverse rotation closes reverse contactor 411 and opens forward contactor 410. Busbar clamp 412 secures the main busbar in place to prevent resonance from causing loosening and short circuits. Transformer 413 feeds secondary current back to the RS485 interface on the smart meter for communication, enabling real-time data interaction and display.

[0106] As shown in Table 1 below, Table 1 is a schematic table of specific parameters of a sample pump body 700 under test measured under the test system in an embodiment of the present application, wherein the flow rate, inlet pressure, outlet pressure, speed, current, voltage input power and other related parameters of the pump body 700 under test can be obtained in the measurement data, and the operating parameters such as the head, water power, and unit efficiency of the pump body 700 under test can be obtained through calculation. At the same time, the actual operating parameters of the pump body 700 under test are converted to the parameters at the rated speed of the pump body to obtain its actual test parameters such as actual flow rate, head and input power.

[0107] By adjusting the flow rate one by one, the limit performance of the tested pump body 700 is tested, and the pump performance curve of the tested pump body 700 is drawn according to the test results. Figure 10 As shown in the figure, the horizontal axis of the pump performance curve is the flow rate, and the vertical axis represents the shaft power, head and pump efficiency from left to right.

[0108] Table 1

[0109]

[0110] The present application also provides a method for testing a water pump test system, which is used for the water pump test system of any one of the above embodiments. The method includes:

[0111] Regulate the on-off valve and solenoid valve of the water pump test system to open the output branch pipe 101 of the water pump test system, disconnect the pipeline between the gas supply component 201 and the cavitation tank 200, and disconnect the pipeline between the gas-liquid separator 202 and the cavitation tank 200, so as to perform a normal working condition test of the pump body 700 under test;

[0112] Regulate the on-off valve and solenoid valve of the water pump test system so that the output branch pipe 101 of the water pump test system is open, the pipeline between the gas supply component 201 and the cavitation tank 200 is connected, and the pipeline between the gas-liquid separator 202 and the cavitation tank 200 is disconnected, so as to perform a cavitation working condition test on the pump body 700 under test;

[0113] Regulate the switch valve and solenoid valve of the water pump test system to disconnect the output branch pipe 101 of the water pump test system, disconnect the pipeline between the gas supply component 201 and the cavitation tank 200, and connect the pipeline between the gas-liquid separation component 202 and the cavitation tank 200, so that the cavitation working condition of the tested pump body 700 is switched to the normal working condition.

[0114] In the above test method, the normal operating condition test refers to the operating condition when the cavitation tank 200 is not connected to the gas supply component 201 and the tested pump body 700 naturally receives the water liquid in the cavitation tank 200. The cavitation operating condition test refers to the operating condition when the cavitation tank 200 is connected to the gas supply component 201 and the tested pump body 700 simultaneously receives the gas and liquid in the cavitation tank 200; since the gas-liquid separator 202 separates the gas in the cavitation tank 200, the cavitation tank 200 returns to the normal scenario of receiving the water liquid in the pressure-regulating tank 100, and the tested pump body 700 can switch from the cavitation operating condition to the normal operating condition.

[0115] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0116] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A water pump testing system, characterized in that: include: A pressure stabilizing tank (100) is used to receive external water, and an output branch pipe (101) is connected to the liquid outlet end of the pressure stabilizing tank (100); A cavitation simulation component comprises a cavitation tank (200), a gas supply component (201) and a gas-liquid separator (202), wherein the cavitation tank (200) is used to connect the output branch pipe (101) and the pump body (700) to be tested, the gas supply component (201) and the gas-liquid separator (202) are both connected to the cavitation tank (200), the gas supply component (201) is used to input gas into the cavitation tank (200), and the gas-liquid separator (202) is used to separate water and gas in the cavitation tank (200); wherein, electromagnetic valves for regulating the on-off state are provided between the gas supply component (201) and the cavitation tank (200), and between the gas-liquid separator (202) and the cavitation tank (200); a control component connected to each of the solenoid valves to regulate the on / off state between the gas supply component (201) and the cavitation tank (200), and between the gas-liquid separation component (202) and the cavitation tank (200); The water pump testing system further includes: A second connecting pipe (306), one end of which is connected to the liquid inlet of the pressure stabilizing tank (100), and the other end of which is connected to the liquid outlet of the pump body (700) to be tested; a second pressure equalizing chamber protruding in the radial direction is constructed on the second connecting pipe (306); the second pressure equalizing chamber is connected to the outside through a second exhaust valve; and an outlet pressure sensor (307) is provided on the second connecting pipe (306); A longitudinal detection branch pipe (500) and a transverse detection branch pipe (502), wherein the liquid outlet ends of the longitudinal detection branch pipe (500) and the transverse detection branch pipe (502) are both connected to the liquid inlet end of the pressure stabilizing tank (100); The longitudinal detection branch pipe (500) has a first liquid inlet port (501) arranged along the longitudinal direction, and the transverse detection branch pipe (502) has a second liquid inlet port (503) arranged along the transverse direction. Either the first liquid inlet port (501) or the second liquid inlet port (503) is connected to the pump body (700) to be tested via the second connecting pipe (306).

2. The water pump testing system according to claim 1, characterized in that: The output branch pipe (101) has at least two output branch pipes (101) arranged in parallel along the height direction, and the diameters of the at least two output branch pipes (101) are different. Each output branch pipe (101) is provided with a flow detection component (102) and an on-off valve component (103). The flow detection component (102) is used to detect the instantaneous flow of the output branch pipe (101), and the on-off valve component (103) is used to regulate the on-off state of the output branch pipe (101). The flow detection component (102) and the on-off valve component (103) are both connected to the control component; When any one of at least two of the output branch pipes (101) is in an open state, the other output branch pipes (101) are in a closed state.

3. The water pump testing system according to claim 1, characterized in that: Also includes: A first connecting pipe (300) is connected at one end to the liquid outlet of the cavitation tank (200) and at the other end to the liquid inlet of the pump body (700) to be tested. The first connecting pipe (300) is provided with a first pressure equalizing chamber (301) protruding in the radial direction. The first pressure equalizing chamber (301) is communicated with the outside through a first exhaust valve (302). An inlet pressure sensor (303) is provided on the first connecting pipe (300).

4. The water pump testing system according to claim 3, characterized in that: Also includes: A liquid storage tank (600), wherein the liquid inlet end of the liquid storage tank (600) is connected to two liquid infusion pipelines (601), each of the liquid infusion pipelines (601) is provided with an on-off valve (602) for regulating the on-off state, and each of the on-off valves (602) is connected to the control assembly; The liquid outlet end of one of the infusion pipelines (601) is located between the first connecting tube (300) and the pump body (700) to be tested, and the liquid inlet end of the other infusion pipeline (601) is located between the second connecting tube (306) and the pump body (700) to be tested.

5. The water pump testing system according to any one of claims 1 to 4, characterized in that: Also includes: A gas extraction component (203) is connected to the gas-liquid separation component (202), and the gas extraction component (203) is used to discharge the gas in the gas-liquid separation component (202); a fluid discharge branch pipe (204) provided at the bottom of the gas-liquid separation element (202), the fluid discharge branch pipe (204) being used to connect the gas-liquid separation element (202) with the outside world, so as to discharge the fluid in the gas-liquid separation element (202) to the outside world; Wherein, a stop valve for regulating the on-off state is provided between the fluid discharge branch pipe (204), the gas extraction component (203) and the gas-liquid separation component (202), and the stop valve is connected to the control component.

6. The water pump testing system according to any one of claims 1 to 4, characterized in that: The control component includes: At least two power distribution components with different power supply frequencies, wherein the at least two power distribution components are used to supply power to the pump body (700) under test, so as to simulate the operating conditions of the pump body (700) under test at different power supply frequencies; At least two power distribution branches, each of which includes a circuit breaker and a contactor connected in series, each of which corresponds to a power distribution component, and the power distribution branch is configured to switch the switching status of the circuit breaker and the contactor to control the power supply status of the corresponding power distribution component.

7. The water pump testing system according to any one of claims 1 to 4, characterized in that: It also includes a liquid inlet pressure detection component, a liquid outlet pressure detection component, a torque detection component and a speed detection component, wherein the liquid inlet pressure detection component is arranged on the liquid inlet side of the pump body (700) to be tested, the liquid outlet pressure detection component is arranged on the liquid outlet side of the pump body (700) to be tested, and the torque detection component and the speed detection component are connected to the pump body (700) to be tested.

8. The water pump testing system according to any one of claims 1 to 4, characterized in that: A proportional valve is connected between the cavitation tank (200) and the gas supply component (201), and the cavitation tank (200) is provided with a liquid level detection component for detecting the height of the liquid level in the cavitation tank (200).

9. A testing method for a water pump testing system, characterized in that: For use in a water pump testing system according to any one of claims 1 to 4, the testing method comprises: Regulating the solenoid valve of the water pump test system to disconnect the pipeline between the gas supply component (201) and the cavitation tank (200), and disconnecting the pipeline between the gas-liquid separation component (202) and the cavitation tank (200), so as to perform a normal operating condition test of the pump body (700) under test; Regulating the solenoid valve of the water pump test system so that the pipeline between the gas supply component (201) and the cavitation tank (200) is connected and the pipeline between the gas-liquid separation component (202) and the cavitation tank (200) is disconnected, so as to perform a cavitation working condition test on the pump body (700) under test; The solenoid valve of the water pump test system is regulated to disconnect the pipeline between the gas supply component (201) and the cavitation tank (200), and to connect the pipeline between the gas-liquid separation component (202) and the cavitation tank (200), so that the cavitation working condition of the tested pump body (700) is switched to the normal working condition.

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