A method and system for synchronous testing of hydraulic performance of a shield pump in a liquid sodium environment

Abstract

The application discloses a kind of liquid sodium environment under shielding pump hydraulic performance synchronous test method and system, including multiple measuring points on the straight pipe section of the inlet and outlet of shielding pump, shielding pump is placed in heat experiment tank, for absorbing heat test fluid.Open experimental pipeline, carry out fluid simulation experiment and measurement, utilize natural gravity to make simulated fluid in measuring cylinder return flow to storage tank, simulated fluid is after re-allocation, the density and kinematic viscosity of simulated fluid under normal temperature condition are equivalent to liquid sodium under high temperature condition.When specific system runs, the parameter of shielding pump under operating condition is tested by the measuring point installed at the inlet and outlet of shielding pump, and the lift of shielding pump is calculated, in the process of obtained shielding pump lift, the frictional resistance loss in pump caused by the frictional resistance between end surface and pump body end surface is calculated, finally, the temperature rise of test fluid after temperature field homogenization is tested by stirring test fluid in heat experiment tank, so as to calculate the efficiency of shielding pump.

Description

Technical Field

[0001] This invention belongs to the field of nuclear power plant shielded pump testing technology, specifically, it relates to a method and system for synchronous testing of the hydraulic performance of shielded pumps in a liquid sodium environment. Background Technology

[0002] Nuclear power plant shielded pumps are critical core equipment in nuclear power plants, playing a vital role, especially in the reactor coolant system. Their design and characteristics differ significantly from conventional industrial pumps, particularly in sodium-cooled fast neutron reactors, where the pump body must withstand harsh operating conditions, with sodium coolant having a boiling point as high as 882°C. Furthermore, to prevent radioactive and conductive liquid sodium from entering the motor and causing damage and nuclear leakage, a thin-walled metal shielding sleeve is installed between the rotor and stator, and the pump body is driven by magnetic coupling.

[0003] However, this makes it very difficult and dangerous to directly measure the hydraulic performance of a canned pump because liquid sodium is used as a coolant. Its physical properties (such as low viscosity and high conductivity) are significantly different from those of conventional fluids such as water. Therefore, special considerations and methods are required. Summary of the Invention

[0004] In view of this, the present invention adopts the method of cold-state simulation test analogy to high-temperature liquid sodium metal, aiming to provide a method and system for accurately measuring the hydraulic performance of canned motor pumps, and for accurately calculating hydraulic parameters such as the efficiency of canned motor pumps.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] According to a first aspect of the invention;

[0007] This invention discloses a method for synchronously testing the hydraulic performance of a shielded pump in a liquid sodium environment, comprising:

[0008] Multiple measuring points are installed on the straight pipe sections at the inlet and outlet of the canned pump to collect data. Then the canned pump is placed in a thermal test tank, which is filled with test fluid for absorbing heat. The test fluid completely submerges the canned pump.

[0009] Turn on the experimental pipeline and use a shielded pump to deliver the simulated fluid in the storage tank to the graduated cylinder. Record the total amount V of the simulated fluid entering the graduated cylinder and the time t. Then, use natural gravity to return the simulated fluid in the graduated cylinder to the storage tank. The simulated fluid has been remixed so that its density and kinematic viscosity are equivalent to liquid sodium at high temperature at room temperature.

[0010] The parameters of the canned motor pump under operating conditions are tested by measuring points installed at the inlet and outlet of the pump, and the pump head is calculated accordingly. The thermodynamic test tank and the storage tank are at the same elevation, and the calculation formula is used. , Pump outlet static pressure, It is the acceleration due to gravity. To simulate the density of the fluid, The height difference between the graduated cylinder and the storage tank;

[0011] The obtained shielded pump head During the process, the frictional resistance loss within the pump caused by frictional resistance between the end face and the pump body end face is calculated. Then calculate the effective power of the canned motor pump. The applicable formula is: ,in, This refers to the volumetric flow rate of the fluid medium passing through the shielded pump.

[0012] The test fluid in the stirred thermodynamic experimental tank causes the temperature rise of the test fluid after homogenization of the temperature field. and apply the formula Calculate the heat released by the canned motor pump Then calculate the thermal loss power of the shielded pump. ,in, , To test the specific heat capacity of a fluid, To test the quality of the fluid;

[0013] The total power driving the shielded pump was tested using an electric power meter. And thus calculate the efficiency of the canned pump. ,in, ,in, The power loss during the mechanical transmission of the magnetic coupler is calculated, and then a performance curve is plotted based on this, and the optimal efficiency point is determined.

[0014] Furthermore, the calculation of the mechanical kinetic energy loss power of the magnetic coupler includes:

[0015] Eddy current loss calculation involves using a Hall element to detect the slip rate of the magnetic coupler driving the canned pump during asynchronous operation. And apply the calculation formula The eddy current loss power is obtained. ;

[0016] Wind resistance loss and friction loss are calculated using fluid dynamics principles and empirical formulas. ,in, The drag coefficient is related to the surface roughness of the shape. The density of the cooling medium, The angular velocity of the rotor, The characteristic radius of the rotor;

[0017] Using the above formula for estimation, focusing on eddy current loss and wind resistance loss, the final result is... And it was simulated using electromagnetic field and fluid dynamics software.

[0018] Furthermore, the friction loss within the canned motor pump is calculated. The process includes:

[0019] After obtaining the density and dynamic viscosity parameters of the simulated fluid transported by the canned motor pump at the operating temperature, the geometry of each component of the canned motor pump, including the impeller radius, was analyzed. The outer diameter d of the bearing section, the inner diameter D of the pump casing, and the length L of the rotating parts;

[0020] The formula for calculating pump casing friction loss is as follows: , Where V is the frictional resistance coefficient and V is the flow velocity.

[0021] Determine the Reynolds number Re based on the flow state, and thereby determine the friction torque coefficient. and friction coefficient ,in, The calculation formula is: In the formula, Re is the Reynolds number, and k is the roughness of the contact surface wall.

[0022] Calculate impeller friction loss based on the theory of rotating disk friction. ,application , Where is the impeller radius, The friction torque coefficient;

[0023] Adding up the losses of all the main rotating components yields the following result. + .

[0024] Furthermore, after determining the optimal efficiency point, a hot sodium test was conducted, and the experimental procedure included:

[0025] The detection thermodynamic test tank is equipped with multiple temperature sensors at the liquid level and bottom. When the shielded pump is submerged below the liquid level in the thermodynamic test tank, a hot sodium test is conducted.

[0026] After the experiment was completed, the shielded pump was lifted to detach it from the thermal experimental tank, and the water temperature in the thermal experimental tank was detected by a temperature sensor.

[0027] The water in the thermal experimental tank was stirred until the temperature monitored by multiple temperature sensors was consistent.

[0028] Furthermore, the thermal experimental tank is equipped with a water temperature difference chamber. The temperature is not greater than 0.5 degrees Celsius, and the water in the thermal test tank contains a colorant.

[0029] Furthermore, the process of installing multiple measuring points on the straight pipe sections at the inlet and outlet of the canned motor pump and collecting data includes:

[0030] Multiple temperature sensors are installed on the straight pipe sections at the pump inlet and outlet for temperature measurement points, and then the pipes are wrapped with insulation. Holes are then drilled in the pipe wall near the temperature measurement points to connect pressure or differential pressure transmitters to test pressure changes. Finally, an ultrasonic flow meter is used, and a sufficiently long straight pipe section is selected to test flow rate changes.

[0031] By adjusting the system valves, the pump is operated at the required test flow point, and multiple flow points are tested to plot the performance curve until parameters such as flow rate, temperature, and pressure are completely stable.

[0032] After all parameters stabilize, during the recording time, the data acquisition system is used to synchronously record the data from all measuring points by taking the average of multiple measurements.

[0033] According to a second aspect of the invention,

[0034] The present invention discloses a detection system installed on a shielded pump, comprising a storage tank, a measuring cylinder, a pressure gauge, a first valve, a second valve, a third valve, an electric power meter, and a flow meter. The flow meter and pressure gauge are installed at the input end of the shielded pump, and the pump is simultaneously connected to the storage tank and the measuring cylinder through the second valve.

[0035] The storage tank is connected to the output end of the shielded pump through a third valve, the measuring cylinder is connected to the output end of the shielded pump through a first valve, and the shielded pump is equipped with the power meter.

[0036] Furthermore, a heater is installed inside the storage tank, the heater being adapted to heat air and liquid.

[0037] Furthermore, it also includes a control module, which includes a main controller, a network communication module, a host computer, an electrical parameter acquisition module, and an analog-to-digital conversion module. The analog-to-digital conversion module is connected to the first pressure sensor, the second pressure sensor, the third pressure sensor, the pressure gauge, and the flow meter, respectively.

[0038] The electrical parameter acquisition module is connected to the power meter, the network communication module, the host computer, and the main controller are connected, and the main controller is connected to the electrical parameter acquisition module and the analog-to-digital conversion module.

[0039] Furthermore, the first valve, the second valve, and the third valve are flow regulating valves, and the first pressure sensor, the second pressure sensor, and the third pressure sensor are respectively installed between the shielded pump, the measuring cylinder, and the storage tank.

[0040] Furthermore, the host computer is a touch screen.

[0041] The present invention has the following advantages:

[0042] The technical solution of this invention is as follows:

[0043] This invention discloses a method and system for synchronously testing the hydraulic performance of a canned motor pump in a liquid sodium environment. It employs a simulated fluid analogy approach, using a simulated fluid as the working medium in a cold-state test with measuring points installed to calculate the effective power of the canned motor pump. Then, by analyzing the test fluid, it calculates the heat loss generated during pump operation, ultimately determining the efficiency of the canned motor pump in actual operation. Compared to existing technologies, the technical solution and testing method disclosed in this invention are more comprehensive, fully considering the influence of temperature and frictional resistance on the pump body, thus obtaining accurate results and effectively detecting the hydraulic performance of the canned motor pump. Attached Figure Description

[0044] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0045] Figure 1 This is a flowchart of the synchronous testing method for the hydraulic performance of a shielded pump in a liquid sodium environment disclosed in this invention.

[0046] Figure 2 This is a flowchart of the calculation of the mechanical kinetic energy loss power of a magnetic coupler disclosed in this invention;

[0047] Figure 3 This is a flowchart of the calculation of friction loss in a canned pump disclosed in this invention;

[0048] Figure 4 This is a flowchart of the hot sodium test procedure disclosed in this invention;

[0049] Figure 5 This is a flowchart of the installation and testing points disclosed in this invention;

[0050] Figure 6 ; This is a schematic diagram of the flow of the detection system disclosed in this invention;

[0051] Figure 7 ; This is a schematic diagram of the detection system structure disclosed in this invention;

[0052] Figure 8 ; This is a schematic diagram of the control module disclosed in this invention;

[0053] The above figures include the following reference numerals:

[0054] 1. Liquid storage tank; 2. Measuring cylinder; 3. Pressure gauge; 4. First valve; 5. Second valve; 6. Third valve; 7. Electric power meter; 8. Flow meter; 9. Shielded pump; 10. Heater; 11. Control module; 111. Main controller; 112. Network communication module; 113. Host computer; 114. Electrical parameter acquisition module; 115. Analog-to-digital conversion module; 12. First pressure sensor; 13. Second pressure sensor; 14. Third pressure sensor. Detailed Implementation

[0055] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0056] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0057] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0058] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in sequences other than those illustrated or described herein.

[0059] Furthermore, the terms “including” and “having” and any variations thereof are intended to cover non-exclusive inclusion, such as a process, method, system, product, or apparatus that includes a series of steps or units, which is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0060] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., may be used here to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figure. It should be understood that spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device as described in the figure.

[0061] For example, if a device in the accompanying drawings is inverted, a device described as "above" or "on top of" other devices or structures will subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below". The device may also be positioned differently, rotated 90 degrees, or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.

[0062] like Figures 1-5 This invention discloses a method for synchronously testing the hydraulic performance of a shielded pump in a liquid sodium environment, comprising the following steps: First, step S1 is performed to prepare the experimental system by installing multiple measuring points on the straight pipe sections at the inlet and outlet of the shielded pump to collect data. Then, the shielded pump is placed in a thermal test tank containing a test fluid for absorbing heat. The test fluid is completely submerged in the shielded pump to fully absorb the heat generated by the pump. Simultaneously, the thermal test tank is insulated to reduce heat loss and improve detection accuracy. During this process, it is necessary to ensure that the shielded pump and the thermal test tank are in a stable state. Next, step S2 is performed to open the experimental pipeline and conduct fluid simulation experiments and measurements. Specifically, the shielded pump is used to transfer the simulated fluid from the storage tank to a graduated cylinder, recording the total amount V of simulated fluid entering the graduated cylinder and the time t. Then, gravity is used to return the simulated fluid from the graduated cylinder to the storage tank. It should be noted that in this step, the simulated fluid is remixed, and its density and kinematic viscosity at room temperature are equivalent to those of liquid sodium at high temperature. Step S3 is executed to calculate the head. Specifically, the parameters of the canned motor pump under operating conditions are measured at the measuring points installed at the inlet and outlet of the pump, and the head of the pump is calculated accordingly. The thermal test tank and the storage tank are at the same elevation, and the calculation formula is used. The actual head of the fluid is obtained. .in, Pump outlet static pressure, It is the acceleration due to gravity. To simulate the density of the fluid, This represents the height difference between the measuring cylinder and the storage tank. Building upon the previous step, further implement step S4 to obtain the canned pump head. During the process, the frictional resistance loss within the pump caused by frictional resistance between the end face and the pump body end face is calculated. Then calculate the effective power of the canned motor pump. The applicable formula is: ,in, , This represents the volumetric flow rate of the fluid medium passing through the shielded pump. Finally, steps S5 and S6 are executed to stir the test fluid in the thermodynamic experimental tank, homogenizing the temperature field and testing the temperature rise of the fluid in subsequent steps. and apply the formula Calculate the heat released by the canned motor pump Then calculate the thermal loss power of the shielded pump. ,in, , To test the specific heat capacity of a fluid, To test the quality of the fluid, the total power driving the canned pump was also measured using an electric power meter. And thus calculate the efficiency of the canned pump. ,in, ,in, The mechanical kinetic energy loss power of the magnetic coupler is calculated, and then the performance curve is plotted based on this, and the optimal efficiency point is determined.

[0063] In a specific embodiment of the present invention, since the canned pump is driven by a motor through a magnetic coupler, the step of calculating the mechanical kinetic energy loss power of the magnetic coupler in step S5 includes first calculating the eddy current loss, and then executing step S51, which involves setting a Hall element to detect the slip rate of the magnetic coupler driving the canned pump during asynchronous operation. And apply the calculation formula The eddy current loss power is obtained. Then, step S52 is executed, which calculates wind resistance loss and friction loss using fluid dynamics principles and applies empirical formulas. The total resistance is calculated. Among them, The drag coefficient is related to the surface roughness of the shape. The density of the cooling medium, The angular velocity of the rotor, Let be the characteristic radius of the rotor. Based on this, after estimating using the above formula, step S53 focuses on eddy current loss and wind resistance loss, ultimately yielding... And it was simulated using electromagnetic field and fluid dynamics software.

[0064] In some embodiments, in step S4, it is necessary to calculate the friction loss within the canned pump. The main steps include first obtaining the density and dynamic viscosity parameters of the simulated fluid being pumped by the canned motor pump at the operating temperature, and then performing step S41 to analyze the geometry of each component of the canned motor pump, including the impeller radius. Given the bearing section outer diameter d, the pump casing inner diameter D, and the length L of the rotating component, proceed to step S42 and apply the formula. Calculate the pump casing friction loss, where Let V be the frictional resistance coefficient and V be the flow velocity. In step S42, the Reynolds number Re is determined primarily by assessing the flow state, and the frictional torque coefficient is determined accordingly. and friction coefficient Furthermore, through the calculation formula , and thus The value of is given by , where Re is the Reynolds number and k is the roughness of the contact surface wall. Finally, step S43 is performed to calculate the impeller friction loss based on the rotating disk friction theory. ,application ,and Where is the impeller radius, This is the friction torque coefficient, obtained by adding up the losses of all the main rotating components mentioned above. The value of .

[0065] In some embodiments, in step S6, after determining the optimal efficiency point, a hot sodium test is performed. The test process includes first detecting the liquid level in the thermal test tank and setting multiple temperature sensors at the bottom. In step S61, after the shielded pump is submerged below the liquid level in the thermal test tank, the hot sodium test is performed. Then, in step S62, after the test is completed, the shielded pump is raised to detach from the thermal test tank, and the water temperature in the thermal test tank is detected by the temperature sensors. Finally, in step S63, the water in the thermal test tank is stirred until the temperatures monitored by the multiple temperature sensors are consistent. The temperature difference of the water detected at this time is then determined. This represents the actual temperature rise after the water absorbs heat. In this embodiment, to reduce heat loss and thus prevent distortion of temperature changes, it is necessary to control... The range of variation is determined by the temperature difference of the water in the thermal experimental tank. The temperature is no greater than 0.5 degrees Celsius, and a colorant is added to the water in the thermal test tank to detect whether there is any through-damage to the pump body.

[0066] In some embodiments, in step S1, the process of installing multiple measuring points and collecting data on the straight pipe sections at the inlet and outlet of the canned motor pump requires installing multiple temperature sensors on the straight pipe sections at the pump inlet and outlet for temperature measurement. Then, step S11 is performed while simultaneously wrapping the pipe with insulation. Holes are then drilled in the pipe wall near the temperature measuring points to connect pressure or differential pressure transmitters to test pressure changes. Next, step S12 is performed using an ultrasonic flow meter, selecting a sufficiently long straight pipe section to test flow rate changes. In step S13, different opening degrees are set by adjusting the system valves, and the pump is operated at the desired test flow rate point. Multiple flow rate points are tested to plot performance curves until parameters such as flow rate, temperature, and pressure are completely stable. Finally, in step S14, after all parameters have stabilized, data from all measuring points are simultaneously recorded using a data acquisition system and a multi-point measurement and averaging method within the recording time.

[0067] Please refer to this as well. Figures 6-8 Based on the same inventive concept, this invention also discloses a detection system that applies the synchronous testing system for the hydraulic performance of a shielded pump in a liquid sodium environment as proposed above. This system is mainly installed on the shielded pump 9 and includes a storage tank 1, a measuring cylinder 2, a pressure gauge 3, a first valve 4, a second valve 5, a third valve 6, a power meter 7, and a flow meter 8. The input end of the shielded pump 9 is equipped with the flow meter 8 and the pressure gauge 3, and is simultaneously connected to the storage tank 1 and the measuring cylinder 2 through the second valve 5. The measuring cylinder 2 is a straight cylinder, and an internal float-type level gauge is installed to measure the liquid level, thereby determining the volume of the fluid inside the measuring cylinder 2. Specifically, the storage tank 1 is connected to the output end of the shielded pump 9 through the third valve 6, and the measuring cylinder 2 is connected to the output end of the shielded pump 9 through the first valve 4. The shielded pump 9 is equipped with a power meter 7, which is used to measure the total power of the motor to provide data for subsequent efficiency calculations.

[0068] In this embodiment, a heater 10 is installed inside the storage tank 1. The heater 10 is suitable for heating air and liquid. The heater 10 can be used to heat either liquid or air. Heating can adjust the physical state of the fluid medium, maximizing the reliability of the simulation. Heating the air can dry the entire system, remove internal moisture, and reduce physical corrosion.

[0069] In this embodiment, a control module 11 is also included. The control module 11 includes a main controller 111, a network communication module 112, a host computer 113, an electrical parameter acquisition module 114, and an analog-to-digital converter module 115. The analog-to-digital converter module 115 is connected to the first pressure sensor 11, the second pressure sensor 12, the third pressure sensor 13, the pressure gauge 3, and the flow meter 8, respectively. The first pressure sensor 11, the second pressure sensor 12, and the third pressure sensor 13 are used to detect the pressure of various parts inside the pipeline online. The pressure gauge 3 and the flow meter 8 are used to calibrate the sensors to avoid test distortion caused by electronic component failure.

[0070] In some embodiments, the electrical parameter acquisition module 114 is connected to the power meter 7, the network communication module 112 and the host computer 113 are connected to the main controller 111, and the main controller 111 is connected to the electrical parameter acquisition module 114 and the analog-to-digital conversion module 115. The host computer 113 is a touch screen, which can remotely control the system through the network communication module 112. Meanwhile, in this embodiment, the first valve 4, the second valve 5, and the third valve 6 are flow regulating valves. The flow regulating valves can achieve stepless control and test the canned pump by maintaining different opening degrees. In addition, since the canned pump 9, the measuring cylinder 2, and the storage tank 1 are respectively equipped with the first pressure sensor 12, the second pressure sensor 13, and the third pressure sensor 14, changes in physical parameters can be detected in a timely manner, thereby providing a basis for finally determining the optimal efficiency point of the canned pump.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for synchronously testing the hydraulic performance of a shielded pump in a liquid sodium environment, characterized in that, include: Multiple measuring points are installed on the straight pipe sections at the inlet and outlet of the canned pump to collect data. Then the canned pump is placed in a thermal test tank, which is filled with test fluid for absorbing heat. The test fluid completely submerges the canned pump. Turn on the experimental pipeline and use a shielded pump to deliver the simulated fluid in the storage tank to the graduated cylinder. Record the total amount V of the simulated fluid entering the graduated cylinder and the time t. Then, use natural gravity to return the simulated fluid in the graduated cylinder to the storage tank. After being remixed, the density and kinematic viscosity of the simulated fluid at room temperature are equivalent to those of liquid sodium at high temperature. The parameters of the canned motor pump under operating conditions are tested by measuring points installed at the inlet and outlet of the pump, and the pump head is calculated accordingly. The thermodynamic test tank and the storage tank are at the same elevation, and the calculation formula is used. , Pump outlet static pressure, It is the acceleration due to gravity. To simulate the density of the fluid, The height difference between the graduated cylinder and the storage tank; The obtained shielded pump head During the process, the frictional resistance loss within the pump caused by frictional resistance between the rotor end face and the pump body end face is calculated. Then calculate the effective power of the canned motor pump. The applied formula is ,in, , This refers to the volumetric flow rate of the fluid medium passing through the shielded pump. The temperature rise of the test fluid in the stirred thermodynamic test tank after the temperature field is homogenized. and apply the formula Calculate the heat released by the canned motor pump Then calculate the thermal loss power of the shielded pump. ,in, , To test the specific heat capacity of a fluid, To test the quality of the fluid; The total power driving the shielded pump was tested using an electric power meter. And thus calculate the efficiency of the canned pump. ,in, ,in, The mechanical kinetic energy loss power of the magnetic coupler is calculated, and then the performance curve is plotted based on this, and the optimal efficiency point is determined.

2. The method for synchronous testing of the hydraulic performance of a shielded pump in a liquid sodium environment as described in claim 1, characterized in that, The calculation of the mechanical kinetic energy loss power of the magnetic coupler includes: Eddy current loss calculation is performed by setting a Hall element to detect the slip rate of the magnetic coupler driving the canned pump during asynchronous operation. And apply the calculation formula Where B is the magnetic flux density. This is the fluid resistance coefficient. To determine the fluid density that enters the shielded pump to perform work, the eddy current loss power is calculated. ; Wind resistance loss and friction loss are calculated using fluid dynamics principles and empirical formulas. ,in, The drag coefficient is related to the surface roughness of the shape. The density of the cooling medium, The angular velocity of the rotor, The characteristic radius of the rotor; Using the above formula for estimation, focusing on eddy current loss and wind resistance loss, the final result is... Simulations were performed using electromagnetic field and fluid dynamics software.

3. The method for synchronous testing of the hydraulic performance of a shielded pump in a liquid sodium environment as described in claim 1, characterized in that, Calculate the friction loss inside the canned motor pump The process includes: After obtaining the density and dynamic viscosity parameters of the simulated fluid transported by the canned motor pump at the operating temperature, the geometry of each component of the canned motor pump, including the impeller radius, was analyzed. The outer diameter d of the bearing section, the inner diameter D of the pump casing, and the length L of the rotating parts; The formula for calculating pump casing friction loss is as follows: , The coefficient of frictional resistance. For flow rate; Determine the Reynolds number Re based on the flow state, and then look up the friction torque coefficient in the table. The calculation formula is as follows: In the formula, k is the roughness of the contact surface wall; Calculate impeller friction loss based on the theory of rotating disk friction. ,application , Where is the impeller radius, This is the friction torque coefficient; Adding the above losses together yields... + .

4. The method for synchronous testing of the hydraulic performance of a shielded pump in a liquid sodium environment as described in claim 1, characterized in that, After determining the optimal efficiency point, a hot sodium test was conducted, and the experimental procedure included: Multiple temperature sensors are installed at the bottom of the inner wall of the thermal test tank. When the shielded pump is submerged below the liquid surface of the thermal test tank, a hot sodium test is conducted. After the experiment was completed, the shielded pump was lifted to detach it from the thermal experimental tank, and the water temperature in the thermal experimental tank was detected by a temperature sensor. The water in the thermal experimental tank was stirred until the temperature monitored by multiple temperature sensors was consistent.

5. The method for synchronous testing of the hydraulic performance of a shielded pump in a liquid sodium environment as described in claim 1, characterized in that, The thermal experimental tank is equipped with a water temperature difference. The temperature is not greater than 0.5 degrees Celsius, and the water in the thermal test tank contains a colorant.

6. The method for synchronous testing of the hydraulic performance of a shielded pump in a liquid sodium environment as described in claim 1, characterized in that, The process of installing multiple measuring points and collecting data on the straight pipe sections at the inlet and outlet of the shielded pump includes: Multiple temperature sensors are installed on the straight pipe sections at the pump inlet and outlet for temperature detection. The area where the temperature measurement points are located is wrapped with an insulation layer. Then, holes are drilled in the pipe wall near the temperature measurement points, and pressure or differential pressure transmitters are connected to test pressure changes. Finally, an ultrasonic flow meter is used, and a sufficiently long straight pipe section is selected to test flow changes. By adjusting the system valves, the pump operating environment is made within the required test flow range. Then, multiple flow points are selected and tested to plot the performance curve, until the flow, temperature, and pressure parameters are completely stable. After all parameters stabilize, during the recording time, the data acquisition system is used to synchronously record the data from all measuring points by taking the average of multiple measurements.

7. A detection system, employing the synchronous testing method for the hydraulic performance of a shielded pump in a liquid sodium environment as described in claim 1, is installed on a shielded pump (9), characterized in that, The system includes a storage tank (1), a measuring cylinder (2), a pressure gauge (3), a first valve (4), a second valve (5), a third valve (6), an electric power meter (7), and a flow meter (8). The input end of the shielded pump (9) is equipped with the flow meter (8) and the pressure gauge (3), and is simultaneously connected to the storage tank (1) and the measuring cylinder (2) through the second valve (5). The storage tank (1) is connected to the output end of the shielded pump (9) through the third valve (6), the measuring cylinder (2) is connected to the output end of the shielded pump (9) through the first valve (4), and the electric power meter (7) is installed on the shielded pump (9).

8. The detection system as described in claim 7, characterized in that, The storage tank (1) is equipped with a heater (10) which is suitable for heating air and liquid.

9. The detection system as described in claim 7, characterized in that, It also includes a control module (11), which includes a main controller (111), a network communication module (112), a host computer (113), an electrical parameter acquisition module (114), and an analog-to-digital conversion module (115). The shielded pump (9), measuring cylinder (2) and storage tank (1) are respectively equipped with a first pressure sensor (12), a second pressure sensor (13) and a third pressure sensor (14). The analog-to-digital converter module (115) is connected to the first pressure sensor (12), the second pressure sensor (13), the third pressure sensor (14), the pressure gauge (3), and the flow meter (8) respectively. The electrical parameter acquisition module (114) is connected to the power meter (7), the network communication module (112) and the host computer (113) are connected to the main controller (111), and the main controller (111) is connected to the electrical parameter acquisition module (114) and the analog-to-digital conversion module (115).

10. The detection system as described in claim 9, characterized in that, The first valve (4), the second valve (5), and the third valve (6) are flow regulating valves.

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