An experimental device for studying the self-healing properties of magnetic fluids

Abstract

The present invention proposes an experimental device for studying the self-healing characteristics of magnetic liquid, the experimental device comprises: a capillary, a pressure pumping component, a magnetic circuit component and an optical circuit component, the capillary is used to fill the magnetic liquid, the pressure pumping component comprises an air pump and a pressure gauge, the air pump is connected to the capillary, the pressure gauge is connected to the air pump, the magnetic circuit component comprises a magnet, a first magnetic conductive loop and a second magnetic conductive loop, the first magnetic conductive loop is connected to the positive pole of the magnet, at least part of the first magnetic conductive loop is arranged adjacent to the capillary, the second magnetic conductive loop is connected to the negative pole of the magnet, at least part of the second magnetic conductive loop is arranged adjacent to the capillary, in the extending direction orthogonal to the capillary, the optical circuit component comprises a laser emitter and a camera, the laser emitter is used to emit a laser into the capillary and be received by the camera. The experimental device for studying the self-healing characteristics of magnetic liquid of the present invention has a simple structure and has the advantage of being convenient for studying the self-healing characteristics of magnetic liquid.

Description

Technical Field

[0001] The invention relates to the technical field of magnetic liquid self-healing property experiments, and in particular to an experimental device for studying the self-healing property of magnetic liquid. Background Art

[0002] Magnetic liquid is a stable colloidal solution formed by uniformly dispersing nano-scale magnetic particles in a base carrier liquid. It has magnetism while maintaining fluidity. Therefore, it has been widely used in various fields, and rotary seals are one of them. A special advantage of magnetic liquid seals over traditional seals is that magnetic liquids have self-healing properties, that is, the magnetic liquid that has been pushed away returns to the sealing position under the action of magnetic force and regains its sealing ability. This is a unique characteristic of magnetic liquid seals. The self-healing properties of magnetic liquids in the sealing process have great application potential, especially in environments such as space and nuclear energy, where materials are difficult to replenish and maintenance is difficult to achieve, and there are great application advantages. However, there is still a lack of analysis and systematic research, and the influence of factors such as the viscosity of the magnetic liquid itself on the self-healing properties is still unclear. Therefore, the present application proposes an experimental research device that can study the self-healing properties of magnetic liquids. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention provides an experimental device for studying the self-healing properties of magnetic liquids, which has a simple structure and is convenient for studying the self-healing properties of magnetic liquids.

[0004] The experimental device for studying the self-healing properties of magnetic liquid according to the embodiment of the present invention comprises:

[0005] A capillary tube, wherein the capillary tube is used to be filled with magnetic liquid;

[0006] A pressure pumping assembly, the pressure pumping assembly comprising an air pump and a pressure gauge, the air pump being connected to the capillary tube for delivering air pressure into the capillary tube, the pressure gauge being connected to the air pump for monitoring the pressure of the air pump;

[0007] A magnetic circuit component, the magnetic circuit component comprising a magnet, a first magnetic conductive loop and a second magnetic conductive loop, the first magnetic conductive loop is connected to the positive pole of the magnet, at least a portion of the first magnetic conductive loop is arranged adjacent to the capillary, the second magnetic conductive loop is connected to the negative pole of the magnet, at least a portion of the second magnetic conductive loop is arranged adjacent to the capillary, and in an extension direction orthogonal to the capillary, at least a portion of the first magnetic conductive loop, the capillary and at least a portion of the second magnetic conductive loop are sequentially arranged at intervals;

[0008] An optical path component includes a laser emitter and a camera. The laser emitter and the camera are arranged relative to each other in the length direction of the capillary. The laser emitter is used to emit laser into the capillary and the laser is received by the camera.

[0009] The experimental device for studying the self-healing properties of magnetic liquid in the embodiment of the present invention loads the magnetic liquid into a capillary to form a sealed cavity between the magnetic liquid and the air pump, and uses the air pump to pressurize the magnetic liquid to cause the magnetic liquid to completely rupture. At the same time, during the pressurization process, the optical path component is used to emit a laser to the magnetic liquid, and the pressure change curve is monitored, recorded and plotted by a pressure gauge, and the light spot change is monitored and recorded by a camera.

[0010] In addition, the air pressure of the air pump can be changed and repeated many times to obtain multiple curves for analysis, thereby obtaining the final experimental results.

[0011] Therefore, the experimental device for studying the self-healing property of magnetic liquid according to the embodiment of the present invention has a simple structure and has the advantage of being convenient for studying the self-healing property of magnetic liquid.

[0012] In some embodiments, the pressure pumping assembly also includes a connecting joint, which includes an installation channel and a ventilation channel, the first end of the ventilation channel is connected to the middle section of the installation channel, the second end of the ventilation channel is connected to the air outlet of the air pump, the first end of the installation channel is connected to the first end of the capillary, and the second end of the installation channel can transmit the laser emitted by the laser emitter.

[0013] In some embodiments, the pressure pumping assembly further comprises a solid glass tube connected to the second end of the mounting channel.

[0014] In some embodiments, the solid glass tube, the mounting channel, and the capillary are coaxially arranged.

[0015] In some embodiments, the connecting joint is a T-shaped three-way joint.

[0016] In some embodiments, the first magnetic conductive loop includes a first connecting segment, a first magnetic conductive segment, and a second connecting segment connected in sequence, and in a direction orthogonal to the extension direction of the capillary, the first magnetic conductive segment and the capillary are arranged at intervals, and there is a gap between the first magnetic conductive segment and the second end of the capillary;

[0017] The second magnetic conductive circuit includes a third connecting segment, a second magnetic conductive segment and a fourth connecting segment which are connected in sequence. In an extension direction orthogonal to the capillary, the second magnetic conductive segment and the capillary are spaced apart, and there is a gap between the second magnetic conductive segment and the second end of the capillary.

[0018] In some embodiments, in the direction in which the first magnetic conductive segment points to the capillary, the cross-sectional area of ​​the first magnetic conductive segment gradually decreases, and the cross-sectional area of ​​the second magnetic conductive segment gradually increases.

[0019] In some embodiments, the ratio of the distance from the center of the magnetic liquid to the second end of the capillary to the radius of the end surface of the first magnetic conductive segment adjacent to the end of the capillary is greater than or equal to 3 and less than or equal to 10.

[0020] In some embodiments, the pressure pumping assembly further includes a pressure gauge and a control valve, wherein the pressure gauge is connected to the air pump to monitor the pressure of the air pump, and the control valve is connected to the air pump outlet to control the air pressure output by the air pump.

[0021] In some embodiments, the experimental device for studying the self-healing properties of magnetic liquids according to an embodiment of the present invention further includes a fine-tuning platform and a mounting seat, wherein the fine-tuning platform includes a fixed base and a movable base, wherein the movable base is movably connected to the fixed base along the height direction of the fine-tuning platform, and the mounting seat is detachably connected to the movable base, and the connecting joint is connected to the mounting seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of an experimental device for studying the self-healing characteristics of magnetic liquid according to an embodiment of the present invention.

[0023] Figure 2 It is a partial structural schematic diagram of an experimental device for studying the self-healing characteristics of magnetic liquid according to an embodiment of the present invention.

[0024] Figure 3 It is a schematic diagram of a capillary of an experimental device for studying the self-healing property of a magnetic liquid according to an embodiment of the present invention, in which no magnetic liquid is injected.

[0025] Figure 4 It is a schematic diagram showing that magnetic liquid has been injected into a capillary of an experimental device for studying the self-healing property of magnetic liquid according to an embodiment of the present invention.

[0026] Figure 5 It is a schematic diagram of the moment of rupture of magnetic liquid in a capillary of an experimental device for studying the self-healing property of magnetic liquid according to an embodiment of the present invention.

[0027] Figure 6 It is a pressure curve diagram drawn by an experimental device for studying the self-healing characteristics of magnetic liquid according to an embodiment of the present invention.

[0028] Reference numerals:

[0029] 100. Magnetic liquid,

[0030] 1. Capillary,

[0031] 2. Pressure pumping assembly, 21. Air pump, 22. Connecting joint, 221. Installation channel, 222. Ventilation channel, 23. Solid glass tube,

[0032] 3. Magnetic circuit assembly, 31. Magnet, 32. First magnetic conductive circuit, 321. First connecting section, 322. First magnetic conductive section, 323. Second connecting section, 33. Second magnetic conductive circuit, 331. Third connecting section, 332. Second magnetic conductive section, 333. Fourth connecting section,

[0033] 4. Optical path components, 41. Laser transmitter, 42. Camera,

[0034] 5. Fine-tuning platform, 51. Fixed base, 52. Mobile base, 53. Mounting base, 54. Connecting rod, 55. Turning handle, 56. Laser fixing base, 57. Reinforcement base. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0036] like Figure 1-Figure 6 As shown, the experimental device for studying the self-healing characteristics of the magnetic liquid 100 according to the embodiment of the present invention includes: a capillary 1, a pressure pumping component 2, a magnetic circuit component 3 and an optical circuit component 4.

[0037] The capillary 1 is used to fill the magnetic liquid 100. The pressure pumping assembly 2 includes an air pump 21 and a pressure gauge (not shown in the figure). The pressure gauge is connected to the air pump 21. The pressure gauge can monitor the air pressure value output by the air pump 21. The air pump 21 is connected to the capillary 1 to deliver air pressure to the capillary 1. It can be understood that the magnetic liquid 100 can be filled with a pipette, and an appropriate amount of magnetic liquid 100 is filled according to the size of the capillary 1. The air outlet of the air pump 21 is connected to one end of the PU air tube, and the other end of the PU air tube can be connected to the capillary 1 through a joint, that is, the joint is located between the laser emitter 41 and the capillary 1, and the joint can not only conduct the air pump 21 and the capillary 1, but also pass the laser emitted by the laser emitter 41 to avoid hindering the laser emitter 41 from emitting laser to the magnetic liquid 100.

[0038] The magnetic circuit assembly 3 includes a magnet 31, a first magnetic conductive loop 32, and a second magnetic conductive loop 33. The first magnetic conductive loop 32 is connected to the positive pole of the magnet 31, and at least a portion of the first magnetic conductive loop 32 is arranged adjacent to the capillary 1. The second magnetic conductive loop 33 is connected to the negative pole of the magnet 31, and at least a portion of the second magnetic conductive loop 33 is arranged adjacent to the capillary 1. In an extension direction orthogonal to the capillary 1, at least a portion of the first magnetic conductive loop 32, the capillary 1, and at least a portion of the second magnetic conductive loop 33 are arranged in sequence.

[0039] It is understandable that if Figure 1 As shown, the first magnetic conductive loop 32 and the second magnetic conductive loop 33 are both arranged adjacent to the capillary 1, so that the magnetic liquid 100 in the capillary 1 gathers under the action of magnetic force, thereby blocking the capillary 1, so that a sealed cavity is formed between the magnetic liquid 100 and the air outlet of the air pump 21. The end of the capillary 1 away from the sealed cavity is directly connected to the outside.

[0040] Optionally, the magnet 31 can be a permanent magnet or an electromagnet. It is understandable that the strength, volume and other indicators of the permanent magnet 31 have higher advantages than ordinary magnets. Preferably, the magnet 31 is an electromagnet, that is, there is a proportional relationship between the electromagnet and the magnetic force, that is, as the current increases or the number of coil turns increases, the magnetic force of the electromagnet will also increase accordingly. At the same time, selecting a core material with stronger magnetism can also increase the magnetic force of the electromagnet. In other words, the variability of the magnetic force of the electromagnet can be used to study the effects of different magnetic fields on self-healing.

[0041] The optical path component 4 includes a laser emitter 41 and a camera 42 . The laser emitter 41 and the camera 42 are arranged relative to each other in the length direction of the capillary 1 . The laser emitter 41 is used to emit laser light to the magnetic liquid 100 in the capillary 1 and the laser light is received by the camera 42 .

[0042] like Figure 1 and Figure 2 As shown, the laser emitter 41 and the camera 42 are respectively arranged on both sides of the capillary 1 in the extension direction of the capillary 1, so that the laser emitted by the laser emitter 41 can form a clear light spot at the sealing position of the magnetic liquid 100, and the shape and size of the light spot are observed by the camera 42 to analyze the sealing effect of the sealing device of the magnetic liquid 100.

[0043] That is to say, Figure 1-Figure 5As shown, the experimental device for studying the self-healing characteristics of the magnetic liquid 100 of the embodiment of the present invention is to load the magnetic liquid 100 into the capillary 1 so that a sealed cavity is formed between the magnetic liquid 100 and the air pump 21, and the air pump 21 is used to pressurize the magnetic liquid 100 so that the magnetic liquid 100 is completely ruptured. At the same time, during the pressurization process, the optical path component 4 is used to emit a laser to the magnetic liquid 100, and the camera 42 is used to monitor and record the image data before the magnetic liquid is injected, when the magnetic liquid is injected or when the magnetic liquid seal is ruptured, and a computer and a pressure gauge are used to draw a pressure change curve.

[0044] like Figure 6 As shown, during the experiment, by turning the handle of the air pump, the pressure in the sealed chamber will gradually increase (i.e., the pressure in the sealed chamber will increase with time) until it reaches the critical pressure resistance value of the magnetic liquid seal. The magnetic liquid seal will rupture and the pressure in the sealed chamber will drop sharply. At this time, the magnetic liquid will undergo self-healing and regain a certain sealing ability.

[0045] Continue to turn the air pump handle, the pressure in the sealed chamber will rise again until it reaches the critical pressure value of the seal after the first rupture and self-healing occurs, and the seal ruptures again, and so on, and we get the following result. Figure 6 The pressure curve is shown in the figure. Figure 6 In the figure, the broken line represents the pressure change in the sealing chamber, the horizontal axis is the experimental time (in seconds), the vertical axis is the pressure value (in kPa), and each peak is the current critical pressure resistance value of the seal. The dotted line represents the self-healing pressure resistance curve, the horizontal axis is the number of times, and the vertical axis is the ratio of the pressure resistance value recovered after the magnetic liquid seal ruptures and self-heals to the initial maximum pressure resistance value, that is, the recovery pressure resistance ratio, which is 1 for the first time and less than 1 each time thereafter.

[0046] In addition, the air pressure of the air pump 21 can be changed and repeated multiple times to obtain multiple curves for analysis, thereby obtaining the final experimental results.

[0047] Therefore, the experimental device for studying the self-healing property of the magnetic liquid 100 according to the embodiment of the present invention has a simple structure and has the advantage of being convenient for studying the self-healing property of the magnetic liquid 100 .

[0048] In some embodiments, the pressure pumping component 2 also includes a connecting joint 22, which includes an installation channel 221 and a ventilation channel 222, the first end of the ventilation channel 222 is connected to the middle section of the installation channel 221, the second end of the ventilation channel 222 is connected to the air outlet of the air pump 21, the first end of the installation channel 221 is connected to the first end of the capillary 1, and the second end of the installation channel 221 can pass the laser emitted by the laser emitter 41.

[0049] Specifically, Figure 1 and Figure 2 As shown, the extension direction of the ventilation channel 222 is not colinear with the extension direction of the installation channel 221, so as to ensure that there is no interference between the injection of pressure into the magnetic liquid 100 and the emission of laser by the laser emitter 41. A light-transmitting member, such as glass, is provided at the second end of the installation channel 221, so that the laser emitted by the laser emitter 41 can pass through the installation channel 221 and be emitted onto the magnetic liquid 100.

[0050] Preferably, the pressure pumping assembly 2 further comprises a solid glass tube 23, and the solid glass tube 23 is connected to the second end of the installation channel 221. It is understandable that one end of the solid glass tube 23 can be connected to the second end of the installation channel 221 through a PU tube to reduce the possibility of the solid glass tube 23 being broken. And the solid glass tube 23 extends toward the side away from the connecting joint 22, which is also easier to install. Optionally, the solid glass tube 23 can also be a glass tube, and the glass tube can allow the laser emitted by the laser generator to pass through the glass tube and irradiate on the magnetic liquid.

[0051] Preferably, the solid glass tube 23, the mounting channel 221 and the capillary tube 1 are coaxially arranged. Figure 1 and Figure 2 As shown, it can be understood that by arranging the solid glass tube 23, the installation channel 221 and the capillary 1 coaxially, it is easier to adjust the laser emitter 41 during the installation and debugging process, and it is also easier for the laser emitter 41 to form a light spot on the magnetic liquid 100 to be monitored.

[0052] Optionally, the connecting joint 22 is a T-shaped three-way joint.

[0053] In some embodiments, the first magnetic conductive circuit 32 includes a first connecting section 321, a first magnetic conductive section 322, and a second connecting section 323 connected in sequence. In the extension direction orthogonal to the capillary 1, the first magnetic conductive section 322 and the capillary 1 are spaced apart, and a gap exists between the first magnetic conductive section 322 and the second end of the capillary 1; the second magnetic conductive circuit 33 includes a third connecting section 331, a second magnetic conductive section 332, and a fourth connecting section 333 connected in sequence. In the extension direction orthogonal to the capillary 1, the second magnetic conductive section 332 and the capillary 1 are spaced apart, and a gap exists between the second magnetic conductive section 332 and the second end of the capillary 1.

[0054] Specifically, Figure 1As shown, the first connecting section 321 and the second connecting section 323 are both connected between the first magnetic conductive section 322 and the positive pole of the magnet 31 to form a first magnetic conductive loop 32, and the third connecting section 331 and the fourth connecting section 333 are both connected between the second magnetic conductive section 332 and the negative pole of the magnet 31 to form a second magnetic conductive loop 33. The extension direction of the first magnetic conductive section 322, the extension direction of the capillary 1, and the extension direction of the second magnetic conductive section 332 are located in the same plane.

[0055] It is understandable that the first magnetic conductive segment 322 and the second magnetic conductive segment 332 are respectively arranged on both sides of the capillary 1, and the gap between the first magnetic conductive segment 322 and the second magnetic conductive segment 332 and the capillary 1 can be arranged according to the different sizes of the outer diameter of the capillary 1. Figure 1 As shown, the distance from the center of the magnetic liquid 100 to the right end of the capillary 1 is h. Then, according to the magnetic field distribution, in the extension direction of the capillary 1 (i.e. Figure 1 In the left and right directions in the center), the magnetic field is maximum at the exact center, and the magnetic fields at the left and right ends of the capillary 1 rapidly weaken as the distance from the center of the magnetic field increases.

[0056] Therefore, during the experiment, after the magnetic liquid 100 breaks, it will move from left to right in the capillary 1 under the action of the pressure difference. If the distance h is small, the magnetic liquid 100 will quickly spray out from the right end face of the capillary 1 after the seal breaks. Even if the magnetic field is strong, it will not be able to return to the sealing gap in the capillary 1, which will be a permanent loss. If the gap h is large, the magnetic liquid 100 will move forward along the tube wall after the seal breaks. In the end, a considerable part of the magnetic liquid 100 may still stay in the capillary 1, but it is a distance away from the center of the capillary. However, it can still return to the sealing gap through the action of the magnetic field and maintain the next stage of sealing to a certain extent.

[0057] Preferably, in the direction in which the first magnetic conductive segment 322 points to the capillary 1, the cross-sectional area of ​​the first magnetic conductive segment 322 gradually decreases, and the cross-sectional area of ​​the second magnetic conductive segment 332 gradually increases. It can be understood that the first magnetic conductive segment 322 and the second magnetic conductive segment 332 have a contraction tendency when extending toward the capillary 1, so that the magnetic field formed on the first magnetic conductive segment 322 and the second magnetic conductive segment 332 is more concentrated, so as to better achieve the sealing of the magnetic liquid 100, and make the sealing and self-healing phenomenon of the magnetic liquid 100 more obvious and easy to observe.

[0058] In some embodiments, the ratio of the distance from the center of the magnetic liquid 100 to the second end of the capillary 1 to the radius of the end surface of the first magnetic conductive segment 322 adjacent to the capillary 1 is greater than or equal to 3 and less than or equal to 10.

[0059] Specifically, Figure 1As shown, the distance from the center of the magnetic liquid 100 to the second end of the capillary 1 is h, and the radius of the end surface of the first magnetic conductive segment 322 adjacent to the end of the capillary 1 is r, then 3≤h / r≤10.

[0060] It is understandable that the end face radius r of the end of the first magnetic conductive section 322 adjacent to the capillary 1 will determine the magnetic field distribution. For example, the smaller the r, the "sharper" the first magnetic conductive section 322. In other words, the smaller the ratio of h / r, the smaller the distance between the rightmost end of the magnetic liquid 100 and the rightmost end face of the capillary 1 when the magnetic liquid 100 is normally sealed, and the magnetic liquid 100 will quickly rush out of the capillary after the seal is broken, and then it will not be able to complete self-healing. On the contrary, the larger the ratio of h / r, the longer the distance between the right end of the magnetic liquid 100 and the right end of the capillary 1, and more magnetic liquid 100 can complete the subsequent self-healing stage. That is, if the ratio of h / r is too small, self-healing cannot be basically formed, and if the ratio of h / r is too large, it does not conform to the actual working conditions, because the actual working conditions cannot set too long a distance, the cost is large, and it is not conducive to the compactness of the overall structure.

[0061] In some embodiments, the pressure pumping assembly 2 further includes a control valve (not shown in the figure), and the pump control is connected to the outlet of the air pump 21 to control the air pressure output by the air pump 21. It is understandable that the air pressure output by the air pump 21 can be controlled by using the control valve.

[0062] In some embodiments, the experimental device for studying the self-healing properties of the magnetic liquid 100 according to the embodiment of the present invention further includes a fine-tuning platform 5 and a mounting seat 53, the fine-tuning platform 5 includes a fixed base 51 and a movable base 52, and the movable base 52 is arranged along the height direction of the fine-tuning platform 5 (such as Figure 2 The mounting base 53 is detachably connected to the movable base 52, and the connecting joint 22 is connected to the mounting base 53.

[0063] Specifically, Figure 2 As shown, the fixed base 51 and the movable base 52 can be connected by a connecting rod 54. There are multiple connecting rods 54, and every two connecting rods 54 are hinged to form a connecting group. There are multiple connecting groups, and the multiple connecting groups are arranged at intervals along the front-to-back direction. The upper and lower ends of the connecting rod 54 are respectively connected to the fixed base 51 and the movable base 52.

[0064] The fine-tuning platform 5 further includes a rotating handle 55, which is connected to the mobile base 52 and can rotate relative to the mobile base 52. The rotating handle 55 is threadedly connected to at least one connecting rod 54, so that rotating the rotating handle 55 can drive the connecting rod 54 to move, thereby realizing the movement of the mobile base 52 in the up and down direction.

[0065] The connection joint 22 and the mounting seat 53 can be detachably connected by screws, and the mounting seat 53 and the mobile base 52 can also be connected by screws. Preferably, a plurality of threaded holes are evenly distributed on the mobile base 52, so that the relative position between the mounting seat 53 and the mobile base 52 can be changed according to different test experiments, thereby realizing the movement of the connection joint 22.

[0066] Preferably, the fine-tuning platform 5 also includes a reinforcement seat 57, which has a through hole in the left-right direction. The aperture of the through hole is adapted to the end face radius of the capillary 1 so that the second end of the capillary 1 can pass through the through hole, thereby utilizing the reinforcement seat 57 to support the capillary 1.

[0067] Optionally, the fine-tuning platform 5 further includes a laser fixing seat 56 , the laser emitter 41 is connected to the laser fixing seat 56 by snap-fitting, and the laser fixing seat 56 is rotatably connected to the movable base 52 to facilitate adjustment of the emission angle of the laser emitter 41 .

[0068] The following describes the experimental process of the experimental device for studying the self-healing characteristics of magnetic liquid according to the embodiment of the present invention.

[0069] When in use, under the action of magnetic force, the magnetic liquid will gather in the capillary tube at the position closest to the first magnetic conductive section and the second magnetic conductive section. At this time, the magnetic liquid seals the capillary passage to form a magnetic liquid seal, and the magnetic liquid in the capillary tube near the end of the connecting joint forms a sealed cavity, while the other end of the capillary tube is connected to the atmosphere at atmospheric pressure.

[0070] Steps for the pressurization test: Turn the air pump, the pressure in the sealed chamber begins to rise, and the pressure gauge records the pressure changes in the sealed chamber in real time. Keep opening the control valve to allow the pressure in the sealed chamber to continue to rise until the magnetic liquid seal breaks and the pressure drops suddenly, then close the control valve. Wait until the magnetic liquid self-heals and regains its pressure resistance, then open the control valve again to allow the pressure in the sealed chamber to rise until the next break. Repeat the pressurization steps many times, or until the magnetic liquid seal breaks completely, and finally obtain the pressure change curve of the sealed chamber.

[0071] The capillary is removed, cleaned with an organic solvent, and subjected to ultrasonic drying and other operations. When the capillary is clean and free of magnetic liquid residue, the pressure test steps are repeated to obtain multiple pressure curves of the magnetic liquid. Multiple curves are analyzed, and the average of the key self-healing experimental results is taken to obtain the final experimental results.

[0072] In addition, the experimental device for studying the self-healing properties of magnetic liquids according to the embodiment of the present invention can also be replaced with other types of magnetic liquids, and the above steps are repeated to obtain the experimental results of the self-healing properties of the magnetic liquid, thereby analyzing the influence of different physical and chemical properties of magnetic bodies on the self-healing properties of magnetic liquids based on the experimental results of the self-healing properties of different magnetic liquids.

[0073] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0074] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0075] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0076] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0077] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0078] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. An experimental device for studying the self-healing properties of magnetic liquids, characterized in that: include: A capillary tube, wherein the capillary tube is used to be filled with magnetic liquid; A pressure pumping assembly, the pressure pumping assembly comprising an air pump and a pressure gauge, the air pump being connected to the capillary tube for delivering air pressure into the capillary tube, the pressure gauge being connected to the air pump for monitoring the pressure of the air pump; A magnetic circuit component, the magnetic circuit component comprising a magnet, a first magnetic conductive loop and a second magnetic conductive loop, the first magnetic conductive loop is connected to the positive pole of the magnet, at least a portion of the first magnetic conductive loop is arranged adjacent to the capillary, the second magnetic conductive loop is connected to the negative pole of the magnet, at least a portion of the second magnetic conductive loop is arranged adjacent to the capillary, and in an extension direction orthogonal to the capillary, at least a portion of the first magnetic conductive loop, the capillary and at least a portion of the second magnetic conductive loop are sequentially arranged at intervals; An optical path component includes a laser emitter and a camera. The laser emitter and the camera are arranged relative to each other in the length direction of the capillary. The laser emitter is used to emit laser into the capillary and the laser is received by the camera.

2. The experimental device for studying the self-healing properties of magnetic liquid according to claim 1, characterized in that: The pressure pumping assembly also includes a connecting joint, which includes an installation channel and a ventilation channel. The first end of the ventilation channel is connected to the middle section of the installation channel, the second end of the ventilation channel is connected to the air outlet of the air pump, the first end of the installation channel is connected to the first end of the capillary, and the second end of the installation channel can transmit the laser emitted by the laser emitter.

3. The experimental device for studying the self-healing properties of magnetic liquid according to claim 2, characterized in that: The pressure pumping assembly also includes a solid glass tube connected to the second end of the mounting channel.

4. The experimental device for studying the self-healing properties of magnetic liquid according to claim 3, characterized in that: The solid glass tube, the mounting channel and the capillary tube are coaxially arranged.

5. The experimental device for studying the self-healing properties of magnetic liquid according to claim 4, characterized in that: The connecting joint is a T-shaped three-way joint.

6. The experimental device for studying the self-healing properties of magnetic liquid according to claim 1, characterized in that: The first magnetic conductive loop comprises a first connecting section, a first magnetic conductive section and a second connecting section which are connected in sequence, and in a direction orthogonal to the extension direction of the capillary, the first magnetic conductive section and the capillary are arranged at intervals, and there is a gap between the first magnetic conductive section and the second end of the capillary; The second magnetic conductive circuit includes a third connecting segment, a second magnetic conductive segment and a fourth connecting segment which are connected in sequence. In an extension direction orthogonal to the capillary, the second magnetic conductive segment and the capillary are spaced apart, and there is a gap between the second magnetic conductive segment and the second end of the capillary.

7. The experimental device for studying the self-healing properties of magnetic liquid according to claim 6, characterized in that: In the direction from the first magnetic conductive segment to the capillary, the cross-sectional area of ​​the first magnetic conductive segment gradually decreases, and the cross-sectional area of ​​the second magnetic conductive segment gradually increases.

8. The experimental device for studying the self-healing properties of magnetic liquid according to claim 7, characterized in that: The ratio of the distance from the center of the magnetic liquid to the second end of the capillary to the radius of the end surface of the first magnetic conductive section adjacent to the capillary is greater than or equal to 3 and less than or equal to 10.

9. The experimental device for studying the self-healing properties of magnetic liquid according to claim 1, characterized in that: The pressure pumping assembly also includes a control valve, which is connected to the air pump outlet to control the air pressure output by the air pump.

10. The experimental device for studying the self-healing properties of magnetic liquid according to claim 2, characterized in that: It also includes a fine-tuning platform and a mounting seat, the fine-tuning platform includes a fixed base and a movable base, the movable base is movably connected to the fixed base along the height direction of the fine-tuning platform, the mounting seat is detachably connected to the movable base, and the connecting joint is connected to the mounting seat.

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