A liquid metal flow rate distribution measuring mechanism and measuring method in a magnetic field

Abstract

The application discloses a kind of liquid metal flow rate distribution measuring mechanism and measuring method in magnetic field, it is related to liquid metal flow state measurement technical field;Measuring mechanism includes: connecting joint, for connecting the measurement interface of corresponding pipeline to be measured, and connecting joint can be sealed and movable and insert potential probe;Thread adjusting assembly is fixedly connected with the connecting joint, and the thread adjusting assembly is used to drive potential probe to move along the axial direction of the connecting joint, to prevent the leakage of liquid metal in the pipeline to be measured during measurement, simultaneously, thread adjusting assembly is fixedly connected with connecting joint, and can drive potential probe to move along the axial direction of the connecting joint, to accurately control the axial displacement of potential probe by screw pair, so that different positions are measured multiple times by continuously moving potential probe, to obtain the flow rate distribution data on the straight line path from the pipe wall to the center region of the pipeline to be measured.Measuring method is based on the aforementioned liquid metal flow rate distribution measuring mechanism in magnetic field.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid metal flow measurement, in particular to a kind of liquid metal flow velocity distribution measuring mechanism and measuring method in magnetic field. BACKGROUND

[0002] Liquid blanket is one of the main candidate schemes of current fusion reactor blanket. The liquid metal in the liquid blanket channel moves in the strong magnetic field of magnetic confinement fusion reactor, and Lorentz force can significantly change its flow state, i.e. very strong magneto-hydrodynamic (MHD) effect is generated. Therefore, accurate measurement of liquid metal flow velocity distribution is of great significance to MHD effect research and liquid blanket development. However, due to the influence of high temperature, strong corrosion, opacity of liquid metal and strong magnetic field environment in the reactor, many traditional flow velocity measurement techniques are difficult to obtain good results or even difficult to implement in MHD experiments.

[0003] In the prior art, the flow velocity distribution of liquid metal is usually measured by using potential probe measurement method. The flow velocity of liquid metal at the measurement point can be converted according to the law of electromagnetic induction by collecting the potential difference of the probe electrode and the applied magnetic field intensity. The structure is simple, the size is small, the influence on the fluid itself is minimal, and it is mainly used for flow velocity measurement of liquid metal in MHD experiment. However, when measuring the flow velocity distribution of liquid metal by using potential detection, it is necessary to control the movement of the potential probe in the liquid metal flow pipe to measure the flow velocity distribution data of liquid metal at different positions. However, the existing potential probe mounting structure cannot meet the needs of liquid metal MHD effect research. SUMMARY

[0004] In view of the technical problem that the existing potential probe mounting structure cannot meet the needs of liquid metal MHD effect research, the present application provides a kind of liquid metal flow velocity distribution measuring mechanism and measuring method in magnetic field, can seal the gap between potential probe and liquid metal flow pipe, and can accurately control the displacement of potential probe, to accurately measure the flow velocity distribution data of liquid metal, meet the needs of liquid metal MHD effect research.

[0005] The present application is realized by the following technical solutions:

[0006] In the first aspect, the present application provides a kind of liquid metal flow velocity distribution measuring mechanism in magnetic field, including: connecting joint, the connecting joint is used for connecting the measurement interface of the pipe to be measured corresponding, and the connecting joint can be sealed and potential probe is movably inserted;Screw adjusting assembly, the screw adjusting assembly is fixedly connected with the connecting joint, and the screw adjusting assembly is used to drive potential probe to move along the axial direction of the connecting joint.

[0007] It should be noted that in the liquid metal MHD experiment, the liquid metal flow rate distribution data at different positions on the path from the pipe wall to the pipe center needs to be extracted, and a mechanism for installing and applying the electric potential probe is needed. The connection between the mechanism and the probe needs to be firm and sealed to effectively prevent the leakage of liquid metal in the cladding channel and ensure the safety and stability of the experiment; the probe measurement position needs to be accurately adjustable after the mechanism is connected to the electric potential probe. At present, there is a lack of devices that meet the above requirements in the related field, so it is necessary to develop a special mechanism for measuring the flow rate distribution of liquid metal in a strong magnetic field by connecting an electric potential probe.

[0008] Therefore, the magnetic field liquid metal flow rate distribution measuring mechanism provided by the application comprises a connecting joint and a threaded adjusting assembly, the connecting joint can be sealingly and movably inserted with an electric potential probe to prevent leakage of liquid metal in the measured pipe during measurement, and the threaded adjusting assembly is fixedly connected with the connecting joint and can drive the electric potential probe to move along the axial direction of the connecting joint to accurately control the axial displacement of the electric potential probe, so that the flow rate distribution data on the straight line path from the pipe wall to the center region of the measured pipe can be obtained by continuously moving the electric potential probe for multiple measurements at different positions.

[0009] The magnetic field liquid metal flow rate distribution measuring mechanism provided by the application can seal the gap between the electric potential probe and the liquid metal flow pipe, accurately control the displacement of the electric potential probe, and accurately measure the flow rate distribution data of the liquid metal, meeting the needs of liquid metal MHD effect research.

[0010] In an optional embodiment of the application, the electric potential probe body is movably inserted into the connecting joint, and the electric potential probe body is in transmission connection with the threaded adjusting assembly, so that the magnetic field liquid metal flow rate distribution measuring mechanism can directly measure the flow rate distribution of the liquid metal in the magnetic field.

[0011] In an optional embodiment of the application, a sealing cap is fixedly fitted in the connecting joint, and the sealing cap is sealingly connected with the connecting joint; the sealing cap is sleeved on the rod portion of the electric potential probe body, and the sealing cap is fitted with a first sealing ring for sealing the gap between the sealing cap and the rod portion of the electric potential probe body, so that the connecting joint can sealingly and movably insert the electric potential probe.

[0012] In an alternative embodiment of the present application, the screw adjusting assembly comprises a mounting frame fixedly connected with the connecting joint, a guide frame in sliding connection with the mounting frame, the guide frame being movable along the axial direction of the connecting joint and fixedly connected with the potential probe body, an adjusting nut mounted on the mounting frame and rotatable along its axial direction, and an adjusting screw in threaded connection with the adjusting nut, the adjusting screw being fixedly connected with the potential probe body and sleeved on the potential probe body to drive the guide frame to move by rotating the adjusting nut, so that the axial displacement of the potential probe is accurately controlled by the screw pair.

[0013] In an alternative embodiment of the present application, the mounting frame comprises a first fixed plate fixedly connected with the connecting joint, a second fixed plate for mounting the adjusting nut, and a plurality of guide rods, both ends of each guide rod being fixedly connected with the first fixed plate and the second fixed plate respectively, and the guide rods being arranged in the guide frame to ensure smooth movement of the guide frame along the axial direction of the connecting joint.

[0014] In an alternative embodiment of the present application, the second fixed plate is provided with a scale dial to directly read the position coordinates of the detection section of the potential probe body in the pipeline to be measured.

[0015] In an alternative embodiment of the present application, the screw adjusting assembly further comprises a sliding guide tube fixedly connected with the first fixed plate and sleeved on the potential probe body, a connecting bellows having one end fixedly connected with the sliding guide tube and the other end fixedly connected with the guide frame, a probe sleeve having one end fixedly connected with the adjusting screw, a second sealing ring capable of sealing the gap between the potential probe body and the probe sleeve, and a sealing screw plug capable of compressing and sealing the gap between the second sealing ring and the potential probe body, the other end of the probe sleeve being fixedly connected with the sealing screw plug to further seal the measuring mechanism and avoid leakage of liquid metal in the pipeline to be measured during the measurement.

[0016] In an alternative embodiment of the present application, the adjusting nut is provided with a driving hand wheel to manually adjust the position of the potential probe body.

[0017] In an alternative embodiment of the present application, the potential probe body comprises a metal sleeve, two detection electrodes are arranged in the metal sleeve in parallel, the detection electrodes are insulated, the detection segments of the detection electrodes extend out of the metal sleeve, and the other ends of the detection electrodes are connected with connecting electrodes, so that the potential probe can accurately measure the potential difference of the local flow of the liquid metal.

[0018] In a second aspect, the present application provides a method for measuring the flow rate distribution of liquid metal in a magnetic field, based on the above-mentioned measuring mechanism for measuring the flow rate distribution of liquid metal in a magnetic field, comprising the following steps:

[0019] The connecting joint is sealingly connected with the measuring interface corresponding to the pipeline to be measured, and the potential probe body is installed in the connecting joint;

[0020] The detection segment of the potential probe is adjusted to a preset initial position by the threaded adjusting assembly, so that the detection segment of the potential probe is parallel and opposite to the flow direction of the liquid metal to be measured;

[0021] The coordinates of each measuring point and the corresponding potential difference under the set uniform magnetic field are recorded;

[0022] The liquid metal flow rate of each measuring point is calculated based on the conversion model;

[0023] The liquid metal flow rate distribution trend in the pipeline to be measured is obtained based on the liquid metal flow rate of each measuring point.

[0024] The method for measuring the flow rate distribution of liquid metal in a magnetic field provided by the present application is based on the above-mentioned measuring mechanism for measuring the flow rate distribution of liquid metal in a magnetic field, the detection segment of the potential probe is adjusted to a preset initial position by the threaded adjusting assembly, so that the detection segment of the potential probe is parallel and opposite to the flow direction of the liquid metal to be measured, then the coordinates of each measuring point and the corresponding potential difference under the set uniform magnetic field are recorded, the liquid metal flow rate of each measuring point is calculated based on the conversion model, and the liquid metal flow rate distribution trend in the pipeline to be measured is obtained based on the liquid metal flow rate of each measuring point, so that the flow rate distribution data of the liquid metal can be accurately measured.

[0025] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0026] 1. The liquid metal flow velocity distribution measuring mechanism in a magnetic field provided by the application comprises a connecting joint and a threaded adjusting assembly, the connecting joint can be sealingly and movably inserted with a potential probe to prevent leakage of the liquid metal in the measured pipeline during the measurement, meanwhile, the threaded adjusting assembly is fixedly connected with the connecting joint and can drive the potential probe to move along the axial direction of the connecting joint to accurately control the axial displacement of the potential probe through the threaded pair, so that multiple measurements at different positions are carried out by continuously moving the potential probe to obtain the flow velocity distribution data of the linear path from the pipe wall to the center region of the measured pipeline, therefore, the gap between the potential probe and the liquid metal flow pipeline can be sealed, and the displacement of the potential probe can be accurately controlled to accurately measure the flow velocity distribution data of the liquid metal, which meets the demand of the liquid metal MHD effect research.

[0027] 2. The liquid metal flow velocity distribution measuring method in a magnetic field provided by the application is based on the above-mentioned liquid metal flow velocity distribution measuring mechanism in a magnetic field, the detection section of the potential probe is adjusted to a preset initial position through the threaded adjusting assembly, so that the detection section of the potential probe is parallel and opposite to the flow direction of the measured liquid metal, then the coordinates of each measurement point and the corresponding potential difference under the set uniform magnetic field are recorded, and the liquid metal flow velocity of each measurement point is calculated based on the conversion model, and the liquid metal flow velocity distribution trend in the measured pipeline is obtained based on the liquid metal flow velocity of each measurement point, so that the flow velocity distribution data of the liquid metal is accurately measured. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and other related drawings can also be obtained by those skilled in the art without creative labor.

[0029] In the drawings:

[0030] Figure 1 The structural schematic diagram of the liquid metal flow velocity distribution measuring mechanism in a magnetic field provided by the embodiment of the present application;

[0031] Figure 2 The sectional structural schematic diagram of the liquid metal flow velocity distribution measuring mechanism in a magnetic field provided by the embodiment of the present application;

[0032] Figure 3 The enlarged structural schematic diagram of part A of the embodiment of the present application; Figure 2

[0033] Figure 4 The enlarged structural schematic diagram of part B of the embodiment of the present application; Figure 2 ​​

[0034] Figure 5 Fig. 1 is a schematic view of a C part of an embodiment of the application; Figure 2 Fig. 2 is a schematic view of a D part of an embodiment of the application;

[0035] Figure 6 Fig. 3 is a schematic view of a C part of an embodiment of the application; Figure 2 Fig. 4 is a schematic view of a D part of an embodiment of the application;

[0036] Figure 7 Fig. 5 is a trend chart of liquid metal flow rate distribution obtained by an embodiment of the application.

[0037] Markings in the drawings and corresponding names of parts:

[0038] 100 - connecting joint, 110 - sealing cap, 120 - first sealing ring, 200 - threaded adjusting assembly, 210 - mounting frame, 211 - first fixed plate, 212 - second fixed plate, 213 - guide rod, 220 - guide frame, 230 - adjusting nut, 231 - driving hand wheel, 240 - adjusting screw, 250 - scale dial, 260 - sliding guide pipe, 270 - connecting bellows, 280 - sealing assembly, 281 - second sealing ring, 282 - probe sleeve, 283 - sealing screw plug, 300 - potential probe body, 310 - metal sleeve, 320 - detection electrode, 330 - connecting electrode, 400 - pipeline to be measured, 410 - measuring interface, 500 - potential acquisition device. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts fall within the scope of protection of the present application.

[0041] It should be noted that: similar marks and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0042] In the description of the present application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the application is placed, only for the purpose of facilitating the description of the application and simplifying the description, and is not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0043] It should be noted that in liquid metal MHD experiments, it is generally necessary to extract the flow rate distribution data of the liquid metal at different positions on the path from the pipe wall to the pipe center, and a mechanism for installing an electric potential probe is needed. The connection between the mechanism and the probe is firm and sealed, so as to effectively prevent the leakage of liquid metal in the cladding channel and ensure the safety and stability of the experiment; the mechanism also needs to realize the accurate adjustment of the measurement position of the electric potential probe after connecting the electric potential probe. At present, there is a lack of devices that meet the above requirements in the related field, therefore, in order to meet the research needs of liquid metal MHD effect and other related fields, it is necessary to develop a special mechanism for measuring the flow rate distribution of liquid metal in a strong magnetic field by connecting an electric potential probe.

[0044] In order to solve the above-mentioned problems, the inventors innovatively designed the following technical solutions, and the specific implementation schemes of the present application will be described in detail below in combination with the drawings.

[0045] Embodiment 1

[0046] In combination Figure 1 The present application provides a mechanism for measuring the flow rate distribution of liquid metal in a magnetic field, comprising: a connecting joint 100, the connecting joint 100 is used for connecting the corresponding measurement interface 410 of the pipe to be measured 400, and the connecting joint 100 can seal and movably insert an electric potential probe; a threaded adjusting assembly 200, the threaded adjusting assembly 200 is fixedly connected with the connecting joint 100, and the threaded adjusting assembly 200 is used for driving the electric potential probe to move along the axial direction of the connecting joint 100.

[0047] It should be understood that the present embodiment can install and connect an electric potential probe body 300, that is, the present application also includes an electric potential probe body 300, the rod part of the electric potential probe body 300 is movably inserted into the connecting joint 100, and the electric potential probe body 300 is in transmission connection with the threaded adjusting assembly 200, so that the mechanism for measuring the flow rate distribution of liquid metal in a magnetic field can directly measure the flow rate distribution of liquid metal in a magnetic field.

[0048] In the embodiment, the potential probe body 300 comprises a metal sleeve 310, two detection electrodes 320 which are spaced apart, insulated through the metal sleeve 310, extend out of the metal sleeve 310, and are adapted with connecting electrodes 330 at the other ends, so as to ensure that the potential probe can accurately measure the potential difference of the local fluid of the liquid metal.

[0049] That is, the potential probe body 300 mainly comprises an external stainless steel tube, internal potential probes (two), and insulating material between the two. The two probe electrodes extending out of the front end of the stainless steel tube are insulated except for the needle tip part, the connecting electrodes 330 at the rear end of the potential probe body 300 are connected to the potential acquisition device 500 through wires, and the potential acquisition device 500 can collect and record the potential difference (mV precision).

[0050] In combination with Figure 2 and Figure 3 , the connecting joint 100 is fixedly adapted with a sealing cap 110, and the sealing cap 110 is sealingly connected with the connecting joint 100; the sealing cap 110 is sleeved on the rod part of the potential probe body 300, and the sealing cap 110 is adapted with a first sealing ring 120 for sealing the gap between the sealing cap 110 and the rod part of the potential probe body 300, so as to ensure that the connecting joint 100 can sealingly and movably insert the potential probe.

[0051] In combination with Figure 2 and Figures 4-6 , the threaded adjusting assembly 200 comprises a mounting frame 210 fixedly connected with the connecting joint 100, a guide frame 220 slidingly connected with the mounting frame 210, the guide frame 220 being capable of moving along the axial direction of the connecting joint 100, and the guide frame 220 being fixedly connected with the potential probe body 300, an adjusting nut 230 mounted on the mounting frame 210, the adjusting nut 230 being capable of rotating along the axial direction thereof, and an adjusting screw 240 screwed with the adjusting nut 230, the adjusting screw 240 being fixedly connected with the potential probe body 300 and sleeved on the potential probe body 300, so as to drive the guide frame 220 to move by rotating the adjusting nut 230, and thus accurately control the axial displacement of the potential probe through the threaded pair.

[0052] Specifically, the mounting frame 210 comprises: a first fixed plate 211 fixedly connected with the connecting joint 100; a second fixed plate 212 for mounting the adjusting nut 230; a plurality of guide rods 213, both ends of each of which are fixedly connected with the first fixed plate 211 and the second fixed plate 212, and the guide rods 213 are arranged in the guide frame 220 to ensure that the guide frame 220 can move smoothly along the axis of the connecting joint 100.

[0053] Generally, the second fixed plate 212 is provided with a scale disc 250 to facilitate direct reading of the position coordinates of the detection section of the potential probe body 300 in the pipeline 400 to be measured.

[0054] On this basis, the threaded adjusting assembly 200 further comprises: a sliding guide pipe 260 fixedly connected with the first fixed plate 211 and sleeved on the potential probe body 300; a connecting bellow 270, one end of which is fixedly connected with the sliding guide pipe 260, and the other end of which is fixedly connected with the guide frame 220; a probe sleeve 282, one end of which is fixedly connected with the adjusting screw 240; a second sealing ring 281 capable of sealing the gap between the potential probe body 300 and the probe sleeve 282; a sealing screw plug 283 capable of compressing and sealing the gap between the second sealing ring 281 and the potential probe body 300, the other end of the sealing screw plug 283 being fixedly connected with the probe sleeve 282 through external threads, so as to further seal the measuring mechanism and avoid leakage of liquid metal in the pipeline 400 to be measured during measurement.

[0055] Generally, the adjusting nut 230 is provided with a driving hand wheel 231 to facilitate manual adjustment of the position of the potential probe body 300.

[0056] In combination Figures 2-6 That is, the threaded adjusting assembly 200 provided by the present embodiment comprises support components such as the sliding guide pipe 260, the first fixed plate 211, the connecting bellow 270, the second fixed plate 212, the guide frame 220, and the linear guide rod 213; position adjusting components such as the adjusting screw 240, the adjusting nut 230, the scale disc 250, and the driving hand wheel 231; sealing and fixing components such as the first sealing ring 120, the second sealing ring 281, the sealing cap 110, the sealing screw plug 283, and the probe sleeve 282. The center line of the potential probe body 300 coincides with the center lines of the main position adjusting components and the sealing and fixing components.

[0057] The first fixed plate 211, the sliding guide pipe 260 are welded in sequence; the connecting bellows 270, the guide frame 220, the second fixed plate 212 are connected and fixed with the main position adjusting component and the sealing and fixing component (probe sleeve 282) by using the buckle bearing; and finally the first fixed plate 211, the guide frame 220 (bearing is added) and the second fixed plate 212 are connected and fixed through the guide rod 213.

[0058] Meanwhile, the adjusting screw 240 and the adjusting nut 230 are connected and fixed through the ball bearing contact, and the scale disc 250 and the driving hand wheel 231 are connected and fixed in sequence through the screw at the rear of the adjusting nut 230. Based on the screw transmission principle, after the adjusting component combination is completed, the adjusting screw nut hand wheel can be rotated according to the scale disc 250 reading, and the adjusting screw 240 is adjusted to advance and retreat by rotating the hand wheel.

[0059] It can be understood that in the embodiment, the sealing and fixing component adopts a double sealing and fixing mode of the probe rear end (second sealing ring 281 + probe sleeve 282 + sealing screw plug 283) and the probe front end (first sealing ring 120 + sealing cap 110 + connecting joint 100). The front and rear ends of the probe sleeve 282 are connected and installed in advance with the connecting bellows 270 and the adjusting screw 240 respectively, the first sealing ring 120 and the second sealing ring 281 are made of fluorine rubber material, and the sealing screw plug 283 and the sealing cap 110 are made of stainless steel material.

[0060] It should be noted that the potential probe body 300 is connected and fixed in the following process:

[0061] The rear end of the potential probe body 300 is sleeved into the second sealing ring 281 to the appropriate position, and then enters the inside of the mechanism through the interface until the second sealing ring 281 contacts the groove bottom of the front end of the probe sleeve 282;

[0062] The sealing screw plug 283 is sleeved into the rear end of the potential probe body 300 and connected with the probe sleeve 282 through the thread, and is tightened until the second sealing ring 281 is tightly pressed together with the probe sleeve 282;

[0063] Finally, the sealing cap 110 is sleeved into the potential probe body 300, the rubber ring (first sealing ring 120) in the inside of the sealing cap 110 extrudes and fixes the front end of the potential probe body 300, and the outside of the sealing cap 110 is connected with the connecting joint 100 through the thread.

[0064] In summary, the magnetic field liquid metal flow rate distribution measuring mechanism provided in the embodiment comprises a connecting joint 100, a threaded adjusting assembly 200, a potential probe body 300 and a potential acquisition device 500; the connecting joint 100 can seal and movably insert the potential probe to prevent leakage of the liquid metal in the to-be-measured pipeline 400 during the measurement process; the threaded adjusting assembly 200 is fixedly connected with the connecting joint 100 and can drive the potential probe to move along the axial direction of the connecting joint 100; the potential probe body 300 and the potential acquisition device 500 are electrically connected.

[0065] In use, the connecting joint 100 of the corresponding precision displacement mechanism is welded and installed at the position of the liquid metal pipeline to be measured (y direction) flow rate, and then the potential probe body 300 is installed in the threaded adjusting assembly 200, and the fixed sealing is checked and determined to be correct, and at the same time the connecting joint 100 is connected to the pipeline to be measured 400 through the flange and fixed to determine that the sealing is correct; then the two wires of the potential probe body 300 are led out from the inside of the adjusting screw 240 and connected to the potential acquisition device 500, and the drive hand wheel 231 is rotated to make the detection electrode 320 at the front end of the potential probe body 300 enter the predetermined position inside the pipeline to be measured 400. After the MHD experiment starts, the liquid metal circulates and flows, first an external uniform magnetic field B0 in the z direction is applied, and the drive hand wheel 231 is adjusted to make the two detection electrodes 320 (spacing d1) at the front end of the potential probe body 300 to the predetermined position (x, total length 2L), and the potential difference data of each position point is collected and recorded After the experiment is finished, the formula is converted to obtain the flow rate uy of each point on the x direction path inside the pipeline to be measured 400, and the distribution change trend is formed.

[0066] Thus, in the strong magnetic environment, the liquid metal flowing in the pipeline to be measured 400 cuts the magnetic induction lines to generate an induced electromotive force, which can be collected by the potential probe body 300 and recorded by the potential acquisition device 500. Through conversion, the local flow rate can be obtained. At the same time, after the potential probe is connected, the measurement position of the probe in the fluid is accurately adjusted by the drive hand wheel 231 component of the mechanism. By continuously moving the potential probe for multiple measurements at different positions, the flow rate distribution data on the straight line path from the pipe wall to the center region of the pipeline to be measured 400 can be obtained.

[0067] In summary, the magnetic field liquid metal flow rate distribution measuring mechanism provided in the embodiment can seal the gap between the potential probe and the liquid metal flowing pipeline, and can accurately control the displacement of the potential probe, so as to accurately measure the flow rate distribution data of the liquid metal, and meet the needs of the research of the liquid metal MHD effect.

[0068] In the embodiment, the position of the probe is adjusted by the screw nut, the potential probe is stable and can accurately position the flow rate distribution measurement point, the mechanism does not need to be welded with the pipeline 400 and the potential probe, and the flange connection, the front end sealing of the probe (sealing ring + sealing cap 110 + interface) and the rear end sealing of the probe (probe sleeve 282 + sealing ring + sealing plug 283) are adopted, so that the connection between the mechanism and the pipeline 400 and the connection between the mechanism and the potential probe are firm and safely sealed, and the leakage of the liquid metal is effectively prevented; meanwhile, the sealing and fixing components of the mechanism are detachable, the overall structure is simple and light, the potential probe can be conveniently and quickly replaced, or the potential probe and the pipeline 400 are locally modified to adapt to different measurement requirements.

[0069] Embodiment 2

[0070] The embodiment provides a method for measuring the flow rate distribution of liquid metal in a magnetic field, based on the magnetic field liquid metal flow rate distribution measuring mechanism described in embodiment 1, comprising the following steps:

[0071] S10, the connecting joint 100 is sealingly connected with the measuring interface 410 corresponding to the pipeline 400 to be measured, and the potential probe body 300 is installed in the connecting joint 100.

[0072] Specifically, after selecting the pipeline 400 to be measured and the internal flow rate measurement path (total length 2L), the connecting joint 100 of the magnetic field liquid metal flow rate distribution measuring mechanism is modified according to the needs. In the embodiment, the connecting joint 100 is a boss flange structure, the pipeline 400 to be measured is opened and a groove flange (polytetrafluoroethylene gasket is placed in the groove) is welded at the corresponding connection position.

[0073] In, the potential probe body 300 is first sleeved into the second sealing ring 281 to the appropriate position, and then enters the inside of the mechanism through the interface until the second sealing ring 281 contacts the front end groove bottom of the probe sleeve 282; the sealing plug 283 is sleeved into the rear of the potential probe body 300 and connected with the probe sleeve 282 through threads, and is tightened until the second sealing ring 281 is tightly pressed together with the probe sleeve 282; the sealing cap 110 is finally sleeved into the potential probe body 300, the rubber ring (first sealing ring 120) inside the sealing cap 110 extrudes and fixes the front end of the potential probe body 300, and the sealing cap 110 outside is connected with the connecting joint 100 through threads.

[0074] S20, the detection section of the potential probe is adjusted to a preset initial position by the threaded adjusting assembly 200, so that the detection section of the potential probe is parallel and opposite to the flow direction of the measured liquid metal.

[0075] Specifically, the adjustment screw assembly 200 moves the detection electrode 320 of the potential probe body 300 to a predetermined initial position, ensuring that the probe electrode 320 is oriented in the opposite direction (-y) and parallel to the liquid metal flow direction (y). The connection connector 100 is then connected via a flange and secured to ensure a secure seal. Simultaneously, the connection electrode 330 of the potential probe body 300, after connecting the two wires, is led out from the inside of the adjustment screw 240 and connected to the potential acquisition device 500.

[0076] S30, recording the coordinates of each measuring point and the corresponding potential difference under the set external uniform magnetic field.

[0077] Specifically, after the experiment started, Figure 1 Liquid metal in the test pipe 400 is shown flowing in the y-direction, and an external uniform magnetic field B0 is applied in the z-direction. The inner wall point at the measuring interface 410 of the test pipe 400 is designated as (L, 0, 0), the corresponding center point of the pipe in the x-direction is designated as (0, 0, 0), and a point on the inner wall of the pipe is designated as (-L, 0, 0). The set value of the external uniform magnetic field B0 is then recorded. By adjusting the driving handwheel 231, the detection electrode 320 (spacing d1) is moved forward and backward along the x-direction, i.e., from (L, 0, 0) to (-L, 0, 0). The coordinates (x, 0, 0) of each measurement point and the corresponding potential difference are recorded.

[0078] S40. Calculate the liquid metal flow rate at each measuring point based on the conversion model.

[0079] That is, according to the conversion model The flow velocity uy at each point (x,0,0) is calculated and converted.

[0080] S50 , based on the liquid metal flow rate at each measuring point, obtaining a distribution trend of the liquid metal flow rate in the pipeline to be measured 400 .

[0081] Combine Figure 3 The final result is the liquid metal flow velocity distribution trend diagram on the path from (L, 0, 0) to (-L, 0, 0) in the x direction inside the pipeline.

[0082] That is to say, the method for measuring the flow velocity distribution of liquid metal in a magnetic field provided in this embodiment is based on the above-mentioned liquid metal flow velocity distribution measuring mechanism in a magnetic field. The detection section of the potential probe is adjusted to a preset initial position through the threaded adjustment component 200, so that the detection section of the potential probe is parallel and opposite to the flow direction of the liquid metal to be measured, and then the coordinates of each measuring point and the corresponding potential difference under the set external uniform magnetic field are recorded, and the liquid metal flow velocity of each measuring point is calculated based on the conversion model, and based on the liquid metal flow velocity of each measuring point, the liquid metal flow velocity distribution trend in the pipeline 400 to be measured is obtained, thereby accurately measuring the flow velocity distribution data of the liquid metal.

[0083] The above detailed description of the specific embodiments of the present application is provided for the purpose of further explaining the objects, technical solutions and advantages of the present application, and it should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A liquid metal flow rate distribution measuring mechanism in a magnetic field, characterized by, The utility model relates to a kind of electric potential probe, including: Connecting joint (100) is used to connect the corresponding measurement interface (410) of pipe (400) to be measured, and can seal and movablely insert electric potential probe body (300); Thread adjusting assembly (200) is fixedly connected with the connecting joint (100), for driving electric potential probe body (300) moves along the axial direction of the connecting joint (100), including mounting bracket (210), guide frame (220), adjusting nut (230) and adjusting screw (240), the mounting bracket (210) is fixedly connected with the connecting joint (100), the guide frame (220) is slidably connected with the mounting bracket (210), can move along the axial direction of the connecting joint (100), and is fixedly connected with the electric potential probe body (300), the adjusting nut (230) is installed on the mounting bracket (210), can rotate along its axis, the adjusting screw (240) is screwed with the adjusting nut (230), is fixedly connected with the electric potential probe body (300), and is sleeved on the electric potential probe body (300), the mounting bracket (210) includes first fixed plate (211), second fixed plate (212) and guide rod (213), the first fixed plate (211) is fixedly connected with the connecting joint (100), the second fixed plate (212) is used to install the adjusting nut (230), the guide rod (213) is provided with multiple, both ends are fixedly connected with the first fixed plate (211) and the second fixed plate (212), and is passed in the guide frame (220); Electric potential probe body (300) is movably inserted in the connecting joint (100), and is drivingly connected with the thread adjusting assembly (200); The thread adjusting assembly (200) further includes: Sliding guide pipe (260) is fixedly connected with the first fixed plate (211), and is sleeved on the electric potential probe body (300) outside; Connecting bellows (270) is fixedly connected with one end of the sliding guide pipe (260), and is fixedly connected with the other end of the guide frame (220); Probe sleeve (282) is fixedly connected with one end of the adjusting screw (240); Second sealing ring (281) can seal the gap between the electric potential probe body (300) and the probe sleeve (282); Sealing screw plug (283) can compress and seal the gap between the second sealing ring (281) and the electric potential probe body (300), and can be fixedly connected with the other end of the probe sleeve (282) by external thread; Wherein, the connecting joint (100) is fixedly fitted with sealing cap (110), and the sealing cap (110) is sealingly connected with the connecting joint (100); The sealing cap (110) is sleeved on the rod portion of the electric potential probe body (300) outside, and the sealing cap (110) is fitted with first sealing ring (120), and the first sealing ring (120) is used to seal the gap between the sealing cap (110) and the rod portion of the electric potential probe body (300).

2. The magnetic field in liquid metal flow rate profile measurement mechanism of claim 1, wherein, The second fixed plate (212) is provided with a scale disc (250).

3. The magnetic field centerline flow rate profile measurement mechanism of claim 1, wherein, The adjusting nut (230) is provided with a driving hand wheel (231).

4. The magnetic-field-in-liquid-metal flow-rate-distribution measuring mechanism according to any one of claims 1 to 3, characterized by The potential probe body (300) comprises: a metal sleeve (310); two detection electrodes (320) are provided at intervals, both of which are insulated and arranged in the metal sleeve (310), the detection segments of which extend out of the metal sleeve (310), and the other ends of which are provided with connecting electrodes.

5. A method of measuring the flow velocity distribution of a liquid metal in a magnetic field, characterized by The liquid metal flow rate distribution measuring mechanism in a magnetic field according to any one of claims 1-4, comprising the following steps: sealingly connecting the connecting joint (100) with a measuring interface (410) corresponding to the pipeline (400) to be measured, and installing the potential probe body (300) in the connecting joint (100); adjusting the detection segment of the potential probe body (300) to a preset initial position through the threaded adjusting assembly (200), so that the detection segment of the potential probe body (300) is parallel to and opposite to the flow direction of the liquid metal to be measured; recording the coordinates of each measuring point and the corresponding potential difference under a set uniform magnetic field; calculating the liquid metal flow rate of each measuring point based on a conversion model; obtaining the liquid metal flow rate distribution trend in the pipeline (400) to be measured based on the liquid metal flow rates of the measuring points.

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