CN114783255A - Dynamic magnetic induction line demonstration assembly and dynamic magnetic induction line demonstration device - Google Patents
Dynamic magnetic induction line demonstration assembly and dynamic magnetic induction line demonstration device Download PDFInfo
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- CN114783255A CN114783255A CN202210437884.1A CN202210437884A CN114783255A CN 114783255 A CN114783255 A CN 114783255A CN 202210437884 A CN202210437884 A CN 202210437884A CN 114783255 A CN114783255 A CN 114783255A
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- 230000006698 induction Effects 0.000 title claims abstract description 119
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 31
- 230000007246 mechanism Effects 0.000 claims abstract description 15
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 239000004020 conductor Substances 0.000 claims description 19
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 3
- 239000010408 film Substances 0.000 description 16
- 230000008859 change Effects 0.000 description 11
- 230000009471 action Effects 0.000 description 9
- 238000009434 installation Methods 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000010409 thin film Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000011087 paperboard Substances 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/18—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism
- G09B23/181—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for electricity or magnetism for electric and magnetic fields; for voltages; for currents
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Abstract
The invention provides a dynamic magnetic induction line demonstration assembly, and relates to the field of physical experiment equipment; the dynamic magnetic induction line demonstration assembly comprises two transparent cover plates and a display film layer which are stacked; the display film layer is arranged between the transparent cover plates in a sealing mode; the display film layer is made of mixed fluid containing nano iron powder and a rust remover; the invention also provides a dynamic magnetic induction line demonstration device, which comprises the dynamic magnetic induction line demonstration component and a dynamic magnetic induction line generation mechanism; the dynamic magnetic induction line generating mechanism is used for generating a dynamic magnetic field; the dynamic magnetic induction line demonstration component is used for demonstrating the magnetic induction lines of the dynamic magnetic field; the invention can demonstrate the dynamic distribution condition of the magnetic induction lines in the changing magnetic field.
Description
Technical Field
The invention relates to the field of physical experiment equipment, in particular to a dynamic magnetic induction line demonstration assembly and a dynamic magnetic induction line demonstration device.
Background
Electromagnetism is a very important part of university physics, and the phenomenon and law of the interaction between electricity and magnetism are studied. From the viewpoint of modern physics, a magnetic field is a special substance existing in the space around a moving charge, except for an electric field, and has a powerful effect on the moving charge located therein. In order to reflect the magnitude and distribution of the magnetic field visually, a plurality of assumed curves, namely magnetic induction lines, are introduced, the direction of the magnetic field is represented by the tangential direction of each point on the magnetic induction lines, and the magnitude of the magnetic field at the point is represented by the density degree of the distribution of the magnetic induction lines. The current course content not only relates to static magnetic field models such as U-shaped permanent magnets, bar-shaped permanent magnets and spherical permanent magnets, but also comprises dynamic magnetic field models such as electrified direct wires, electrified solenoid coils and three-phase alternating current, wherein the magnetic field distribution can change along with the change of the current magnitude and direction. The basic distribution characteristics of the magnetic induction lines of the models are known, and the basis for mastering and analyzing the magnetic circuit is provided.
In the prior art, the demonstration experiment of the magnetic induction line mainly places a magnet on a hard board, iron filings are uniformly scattered on the paper board, and the paper board is tapped to magnetize and move the iron filings under the action of a magnetic field, so that the shape of the magnetic induction line is displayed. However, the iron filings in the method are easy to be adsorbed on the magnet, the cleaning and the recovery are very inconvenient after the use, and the dynamic distribution condition of the magnetic induction lines in the changing magnetic field can not be demonstrated.
Disclosure of Invention
The invention aims to solve the technical problem that the existing magnetic induction line demonstration device cannot demonstrate the dynamic distribution condition of magnetic induction lines in a changing magnetic field.
The invention provides a dynamic magnetic induction line demonstration assembly, which comprises two transparent cover plates and a display film layer, wherein the two transparent cover plates are stacked; the display film layer is arranged between the transparent cover plates in a sealing mode; the display film layer is made of a mixed fluid including nano iron powder and a rust remover.
Furthermore, the nano iron powder is nano spherical iron powder with the particle size of 200-500 nm.
The invention also provides a dynamic magnetic induction line demonstration device, which comprises the dynamic magnetic induction line demonstration component and a dynamic magnetic induction line generation mechanism;
the dynamic magnetic induction line generating mechanism is used for generating a dynamic magnetic field;
the dynamic magnetic induction line demonstration component is used for demonstrating the magnetic induction lines of the dynamic magnetic field.
Further, the dynamic magnetic induction line generating mechanism comprises a first dynamic magnetic induction line generating circuit; the first dynamic magnetic induction line generating circuit comprises a power-on solenoid, a single-phase alternating current power supply and a power-on solenoid switch; the electrified solenoid coil is connected with the electrified solenoid coil switch in series and then is connected with the single-phase alternating current power supply; an electrified solenoid mounting hole for mounting the electrified solenoid is formed in the transparent cover plate; the electrified solenoid is arranged in the electrified solenoid mounting hole in a penetrating way.
Further, the first dynamic magnetic induction line generating circuit further comprises a power-on straight conductor and a power-on straight conductor switch; the electrified straight wire is connected with the electrified straight wire switch in series and then is connected with the electrified solenoid coil and the electrified solenoid coil switch in parallel.
Further, the dynamic magnetic induction line generating mechanism further comprises a second dynamic magnetic induction line generating circuit; the second dynamic magnetic induction line generating circuit comprises a three-phase alternating-current power supply, and a first phase branch, a second phase branch and a third phase branch which are respectively connected with the three-phase alternating-current power supply; the first phase branch, the second phase branch and the third phase branch are connected in parallel; the first phase branch comprises a first phase branch switch and a first phase coil which are connected in series; the second phase branch comprises a second phase branch switch and a second phase coil connected in series; the third phase branch circuit comprises a third phase branch circuit switch and a third phase coil which are connected in series; a first phase coil mounting hole, a second phase coil mounting hole and a third phase coil mounting hole are formed in the transparent cover plate; the first phase coil mounting holes, the second phase coil mounting holes and the third phase coil mounting holes are uniformly distributed on the same circumference; the first phase coil, the second phase coil and the third phase coil are respectively arranged in the first phase coil mounting hole, the second phase coil mounting hole and the third phase coil mounting hole in a penetrating mode.
Furthermore, the dynamic magnetic induction line demonstration device also comprises a box body and a mounting plate frame;
the inner side of the box body is provided with a limiting convex edge for supporting the mounting plate frame at the upper end in the box body; the dynamic magnetic induction line generating mechanism is arranged in the box body;
the mounting plate frame is detachably arranged on the limiting convex ribs; the mounting plate frame comprises a C-shaped mounting plate and a closed beam; the inner side of the C-shaped mounting plate is oppositely provided with a guide groove; two ends of the dynamic magnetic induction line demonstration assembly are respectively inserted into the guide grooves; the closed beam is detachably connected with the C-shaped mounting plate and used for limiting the dynamic magnetic induction line demonstration assembly in the guide groove.
Further, pin holes are oppositely formed in the inner sides of the C-shaped mounting plates; mounting holes are respectively formed in two ends of the closed beam; limiting slotted holes communicated with the mounting holes are formed in two ends of the upper side of the closed beam respectively, and the limiting slotted holes are formed along the length direction of the closed beam; a spring pin and a spring which are matched with the pin hole for use are arranged in the mounting hole; one end of the spring pin is inserted into the pin hole, and the other end of the spring pin is abutted to the spring; the spring is in a compressed state; a deflector rod is arranged on the side wall of the spring pin and extends to the upper part of the closed beam through the limiting slotted hole; the closed beam is detachably connected with the C-shaped mounting plate through the spring pin.
Furthermore, two ends of the C-shaped mounting plate are respectively provided with a limiting groove; the two ends of the closed beam are respectively provided with a limiting block which is matched with the limiting groove for use and is used for being inserted into the limiting groove; the limiting groove is matched with the limiting block and used for supporting the closed beam on the C-shaped mounting plate, so that the spring pin and the pin hole are coaxially arranged.
Further, a handle is arranged on the mounting plate frame and used for being conveniently taken out of the mounting plate frame.
The technical scheme provided by the embodiment of the invention has the following beneficial effects: the dynamic magnetic induction line demonstration assembly in the embodiment of the invention comprises two transparent cover plates and a display film layer which are stacked; the display film layer is arranged between the transparent cover plates in a sealing mode and is made of mixed fluid containing nano iron powder and a rust remover; when demonstrating magnetic induction lines generated by a dynamic magnetic field, the dynamic magnetic induction line demonstration assembly is placed in the dynamic magnetic field, and under the action of the dynamic magnetic field, the nano iron powder is quickly magnetized and quickly moved, so that the densities of different sites of the display film layer are changed along with the change of the magnetic field, an interference phenomenon is generated under the action of light, and dynamic film interference fringes which are as clear as the magnetic induction lines appear, so that the demonstration of the dynamic magnetic induction lines is realized; the dynamic magnetic induction line demonstration component is quick in response to a dynamic magnetic field and good in demonstration effect; in addition, the nano iron powder is distributed in the rust remover, so that the nano iron powder is not easy to rust, and the service life of the nano iron powder is prolonged.
Drawings
FIG. 1 is a schematic perspective view of a dynamic magnetic induction line demonstration assembly according to an embodiment of the present invention;
FIG. 2 is a schematic perspective view of a dynamic magnetic induction line demonstration apparatus according to an embodiment of the present invention;
fig. 3 is a schematic perspective view of the dynamic magnetic induction line demonstration apparatus of fig. 1 when the case cover 101 is in an open state;
fig. 4 is a schematic perspective view of the box 1 in the dynamic magnetic induction line demonstration apparatus of fig. 3;
fig. 5 is a schematic view of a combined structure of a mounting plate frame 3 and a magnetic induction line display assembly 2 in the dynamic magnetic induction line demonstration device of fig. 3;
fig. 6 is a schematic perspective view of the dynamic magnetic induction demonstration assembly of fig. 1 when an energized solenoid 6, an energized straight conductor 9, a first phase coil 17, a second phase coil 19 and a third phase coil 21 are installed thereon;
fig. 7 is a schematic perspective view of a mounting plate frame 3 in the dynamic magnetic induction line demonstration apparatus of fig. 3;
fig. 8 is a schematic perspective view of the C-shaped mounting plate 31 in the mounting plate frame 3 of fig. 7;
fig. 9 is a schematic perspective view of the enclosure beam 32 of the mounting panel frame 3 of fig. 7;
FIG. 10 is a side view of the containment beam 32 of FIG. 9;
FIG. 11 is a cross-sectional view taken along line A-A of the containment beam 32 of FIG. 10;
FIG. 12 is a schematic view of the combination of spring pin 321, toggle 322 and spring 326 of closure beam 32 of FIG. 11;
FIG. 13 is a perspective view of the spring pin 321 of FIG. 12;
FIG. 14 is a schematic diagram of a first dynamic magnetic induction line generating circuit in a magnetic induction line demonstration apparatus according to an embodiment of the present invention;
FIG. 15 is a schematic diagram of a second dynamic magnetic induction line generating circuit in the magnetic induction line demonstration apparatus according to the embodiment of the present invention;
wherein, 1, a box body; 101. a box cover; 102. a limit bead; 2. a dynamic magnetic induction line demonstration component; 201. a transparent cover plate; 202. an energized solenoid mounting hole; 203. a live straight wire mounting hole; 204. a first phase coil mounting hole; 205. a second phase coil mounting hole; 206. a third phase coil mounting hole; 207. displaying the thin film layer; 3. installing a plate frame; 31. a C-shaped mounting plate; 311. a guide groove; 312. a handle; 313. a pin hole; 314. a limiting groove; 32. closing the beam; 321. a spring pin; 322. A deflector rod; 323. limiting slotted holes; 324. a limiting block; 325. mounting holes; 326. a spring; 327. A threaded mounting hole; 328. a limiting rod; 4. a single-phase AC power supply; 5. an adjustable resistance box; 6. energizing the solenoid; 7. a first protection resistor; 8. a power-on solenoid switch; 9. electrifying the straight wire; 10. A second protection resistor; 11. a switch for energizing the straight conductor; 12. a circuit switch; 13. a three-phase AC power supply; 14. a first phase leg switch; 15. a second phase branch switch; 16. a third phase branch switch; 17. a first phase coil; 18. a first phase protection resistor; 19. a second phase coil; 20. a second phase protection resistor; 21. a third phase coil; 22. a third phase protection resistor; 23. and a resistance value adjusting knob.
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the invention and together with the description, serve to explain the principles of the invention and not to limit the scope of the invention.
Referring to fig. 1, an embodiment of the present invention provides a dynamic magnetic induction line demonstration assembly, which includes two transparent cover plates 201 and a display thin film layer 207 stacked together; the display film layer 207 is hermetically arranged between the transparent cover plates 201; the thin film layer 207 is shown to be made of a mixed fluid including nano iron powder and a rust remover.
And after the nanometer iron powder and the rust remover are uniformly mixed, the mixed fluid is obtained, the mixed fluid is coated on one transparent cover plate 201, the other transparent cover plate 201 is covered, the display film layer 207 is positioned between the transparent cover plates 201, and the edge of the transparent cover plate 201 is sealed through an adhesive tape.
Exemplarily, in the present embodiment, the transparent cover plate 201 is a transparent glass cover plate.
In order to better disperse the nanometer iron powder in the rust remover, the mass ratio of the nanometer iron powder to the rust remover is 18-55: 100.
In the embodiment, the mass ratio of the nano iron powder to the rust remover is 28: 100; the rust remover is a WD-40 rust remover.
In order to enable the nano iron powder in the display film layer 207 to respond to the change of the magnetic field more sensitively, the nano iron powder is nano spherical iron powder, and the particle size is 200-500 nm.
Referring to fig. 2 to 8, an embodiment of the present invention further provides a dynamic magnetic induction line demonstration apparatus, which includes the above dynamic magnetic induction line demonstration assembly 2, a dynamic magnetic induction line generation mechanism, a box body 1, and a mounting plate frame 3;
the dynamic magnetic induction line generating mechanism is arranged in the box body 1 and used for generating a dynamic magnetic field;
the dynamic magnetic induction line demonstration component 2 is used for demonstrating the magnetic induction lines of the dynamic magnetic field;
the inner side of the box body 1 is provided with a limiting convex edge 102 which is used for supporting the mounting plate frame 3 at the upper end in the box body 1;
the mounting plate frame 3 is detachably arranged on the limiting convex ribs 102; the mounting plate frame 3 comprises a C-shaped mounting plate 31 and a closed beam 32; the inner side of the C-shaped mounting plate 31 is oppositely provided with a guide groove 311; two ends of the dynamic magnetic induction line demonstration component 2 are respectively inserted into the guide grooves 311; the closure beam 32 is detachably connected to the C-shaped mounting plate 31 for confining the dynamic induction line demonstration assembly 2 within the guide slot 311.
Specifically, referring to fig. 8 to 12, pin holes 313 are oppositely provided on the inner side of the C-shaped mounting plate 31; mounting holes 325 are respectively formed at two ends of the closed beam 32; two ends of the upper side of the closed beam 32 are respectively provided with a limit slot 323 communicated with the mounting hole 325, and the limit slot 323 is arranged along the length direction of the closed beam 32; a spring pin 321 and a spring 326 which are matched with the pin hole 313 are arranged in the mounting hole 325; one end of the spring pin 321 is inserted into the pin hole 313, and the other end abuts against the spring 326; the other end of the spring pin 321 is provided with a limiting rod 328, and the limiting rod 328 and the spring pin 321 are coaxially arranged; one end of the spring 326 is sleeved on the limiting rod 328; spring 326 is in a compressed state; a deflector rod 322 is arranged on the side wall of the spring pin 321, and the deflector rod 322 extends to the upper part of the closed beam 32 through a limiting slotted hole 323; the closure beam 32 is detachably connected to the C-shaped mounting plate 31 by a spring pin 321.
Referring to fig. 12 and 13, a spring pin 321 and a lever 322 are installed for convenience; the lower end of the shift lever 322 is provided with a threaded connection part (not shown in the figure); the side wall of the spring pin 321 is provided with a threaded mounting hole 327 matched with the threaded connection part for use; the shift lever 322 is in threaded connection with the spring pin 321; during installation, the spring 326 and the spring pin 321 are sequentially installed in the installation hole 325, the shifting rod 322 is inserted into the opening of the threaded installation hole 327 through the limiting groove hole 323 and is screwed into the shifting rod 322, installation of the spring pin 321 and the shifting rod 322 is achieved, and the spring 326 is in a compressed state.
Referring to fig. 8 and 9, in order to facilitate the alignment of the spring pins 321 with the pin holes 313, both ends of the C-shaped mounting plate 31 are respectively provided with a stopper groove 314; two ends of the closed beam 32 are respectively provided with a limiting block 324 which is matched with the limiting groove 314 for use and is inserted in the limiting groove 314; the stop groove 314 cooperates with the stop block 324 for supporting the closure beam 32 on the C-shaped mounting plate 31 such that the spring pin 321 is coaxially disposed with the pin hole 313.
Referring to fig. 8, the mounting plate frame 3 is taken out for convenience; the mounting plate frame 3 is provided with a handle 312.
Referring to fig. 4, a cover 101 is further disposed on the box body 1, and the cover 101 is rotatably connected to the box body 1 through a rotating shaft and is used for closing or opening an opening of the box body 1.
Referring to fig. 14, the dynamic magnetic induction line generating mechanism includes a first dynamic magnetic induction line generating circuit; the first dynamic magnetic induction line generating circuit comprises an electrified solenoid 6, a single-phase alternating current power supply 4 and an electrified solenoid switch 8; the electrifying solenoid 6 and the electrifying solenoid switch 8 are connected in series and then connected with the single-phase alternating current power supply 4; a first protective resistor 7 is arranged between the electrifying solenoid coil 6 and the electrifying solenoid coil switch 8; a circuit switch 12 and an adjustable resistance box 5 are arranged between the electrified solenoid switch 8 and the single-phase alternating-current power supply 4; an electrifying solenoid coil mounting hole 202 for mounting the electrifying solenoid coil 6 is formed in the transparent cover plate 201; the electrified solenoid 6 is arranged in the electrified solenoid mounting hole 202 in a penetrating way; the energizing solenoid switch 8, the circuit switch 12 and the resistance value adjusting knob 23 of the adjustable resistance box 5 are all installed on the C-shaped installation plate 31.
When demonstrating the distribution of the dynamic magnetic induction lines of the electrified solenoid, the circuit switch 12 and the electrified straight conductor switch 11 are disconnected; adjusting the resistance value of the adjustable resistance box 5 to the maximum, and starting the electrified solenoid switch 8 and the circuit switch 12; slowly reducing the resistance value of the adjustable resistance box 5 to a proper value; under the action of a single-phase alternating current power supply 4, the current magnitude and direction of the electrified solenoid 6 periodically change, so that the magnetic field intensity around the electrified solenoid 6 and the direction of the magnetic induction line periodically change, the nanometer iron powder in the dynamic magnetic induction line demonstration component 2 is rapidly magnetized and moves, the density of different sites of the display film layer 207 is changed along with the change of the magnetic field, an interference phenomenon is generated under the action of light, dynamic film interference fringes which are as clear as the magnetic induction line appear, and the demonstration of the dynamic magnetic induction line of the electrified solenoid is realized.
Further, the first dynamic magnetic induction line generating circuit further comprises a powered straight conductor 9 and a powered straight conductor switch 11; the electrifying direct lead 9 is connected with the electrifying direct lead switch 11 in series and then is connected with the electrifying solenoid 6 and the electrifying solenoid switch 8 in parallel; a second protection resistor 10 is arranged between the electrified straight conductor 9 and the electrified straight conductor switch 11; an electrified straight wire mounting hole 203 is formed in the transparent cover plate 201; the electrified straight conductor 9 is connected into the first dynamic magnetic induction line generating circuit through an electrified straight conductor mounting hole 203; the live direct conductor switch 11 is mounted on the C-shaped mounting plate 31.
When demonstrating the distribution of dynamic magnetic induction lines of the electrified straight conductor, the circuit switch 12, the electrified straight conductor switch 11 and the electrified solenoid switch 8 are all disconnected; adjusting the resistance value of the adjustable resistance box 5 to the maximum value, and starting the electrified direct-current wire switch 11 and the circuit switch 12; slowly reducing the resistance value of the adjustable resistance box 5 to a proper value; under the action of the single-phase alternating current power supply 4, the current magnitude and direction of the electrified straight conductor 9 periodically change, so that the magnetic field intensity around the electrified straight conductor 9 and the direction of the magnetic induction line periodically change, the nanometer iron powder in the dynamic magnetic induction line demonstration component 2 is rapidly magnetized and moves, the density of different sites of the display film layer 207 is changed along with the change of the magnetic field, an interference phenomenon is generated under the action of light, dynamic film interference fringes which are as clear as the magnetic induction lines appear, and the demonstration of the dynamic magnetic induction lines of the electrified straight conductor is realized.
Referring to fig. 15, the dynamic magnetic induction line generating mechanism further includes a second dynamic magnetic induction line generating circuit; the second dynamic magnetic induction line generating circuit comprises a three-phase alternating-current power supply 13, and a first phase branch, a second phase branch and a third phase branch which are respectively connected with the three-phase alternating-current power supply 13; the first phase branch, the second phase branch and the third phase branch are connected in parallel; the first phase branch comprises a first phase branch switch 14, a first phase coil 17 and a first phase protection resistor 18 which are connected in series; the second phase branch comprises a second phase branch switch 15, a second phase coil 19 and a second phase protection resistor 20 which are connected in series; the third phase branch comprises a third phase branch switch 16, a third phase coil 21 and a third phase protection resistor 22 which are connected in series; a first phase coil mounting hole 204, a second phase coil mounting hole 205 and a third phase coil mounting hole 206 are formed in the transparent cover plate 201; the first phase coil mounting holes 204, the second phase coil mounting holes 205 and the third phase coil mounting holes 206 are uniformly distributed on the same circumference; the first phase coil 17, the second phase coil 19 and the third phase coil 21 are respectively arranged in the first phase coil mounting hole 204, the second phase coil mounting hole 205 and the third phase coil mounting hole 206 in a penetrating manner; the first phase branch switch 14, the second phase branch switch 15 and the third phase branch switch 16 are all mounted on a C-shaped mounting plate 31.
When the three-phase alternating current dynamic magnetic induction line distribution is demonstrated, the circuit switch 12, the electrified direct-current wire switch 11 and the electrified solenoid switch 8 are disconnected; the first phase branch switch 14, the second phase branch switch 15 and the third phase branch switch 16 are turned on; three-phase asynchronous current is conducted in the first-phase coil 17, the second-phase coil 19 and the third-phase coil 21, the phase difference among the currents is 2 pi/3, under the action of the three-phase alternating current power supply 13, the magnitude and direction of the current passing through the first-phase coil 17, the second-phase coil 19 and the third-phase coil 21 are periodically changed, the direction and magnitude of a resultant magnetic field at the central position are periodically changed along with time, nanometer iron powder in the dynamic magnetic induction line demonstration assembly 2 is rapidly magnetized and moved, the density of different positions of the display film layer 207 is changed along with the change of the magnetic field, an interference phenomenon is generated under the action of light, dynamic film interference fringes similar to the magnetic induction lines are generated, and the demonstration of the three-phase alternating current dynamic magnetic induction lines is achieved.
The dynamic magnetic induction line demonstration device in the embodiment is quick in response to a magnetic field, remarkable in demonstration effect, capable of effectively solving the problems that scrap iron is easy to oxidize, difficult to recover, slow in movement, fuzzy in phenomenon and limited in static magnetic field in the prior art, and suitable for demonstration of dynamic magnetic induction lines in teaching.
The above is not mentioned, is suitable for the prior art.
In this document, the terms front, back, upper, lower and the like in the drawings are used for the sake of clarity and convenience only for the components are located in the drawings and the positions of the components relative to each other. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (10)
1. A dynamic magnetic induction line demonstration assembly is characterized by comprising two transparent cover plates and a display film layer which are stacked; the display film layer is arranged between the transparent cover plates in a sealing mode; the display film layer is made of a mixed fluid including nano iron powder and a rust remover.
2. The dynamic magnetic induction line demonstration assembly according to claim 1, wherein the nano iron powder is nano spherical iron powder, and the particle size is 200-500 nm.
3. A dynamic magnetic induction line demonstration apparatus comprising the dynamic magnetic induction line demonstration assembly and the dynamic magnetic induction line generation mechanism as claimed in claim 1 or 2;
the dynamic magnetic induction line generating mechanism is used for generating a dynamic magnetic field;
the dynamic magnetic induction line demonstration component is used for demonstrating the magnetic induction lines of the dynamic magnetic field.
4. The dynamic line of magnetic induction demonstration apparatus according to claim 3 wherein said dynamic line of magnetic induction generating means comprises a first dynamic line of magnetic induction generating circuit; the first dynamic magnetic induction line generating circuit comprises an electrified solenoid, a single-phase alternating current power supply and an electrified solenoid switch; the electrified solenoid coil is connected with the electrified solenoid coil switch in series and then is connected with the single-phase alternating current power supply; the transparent cover plate is provided with an electrified solenoid mounting hole for mounting the electrified solenoid; the electrified solenoid is arranged in the electrified solenoid mounting hole in a penetrating way.
5. The dynamic line of magnetic induction demonstration apparatus of claim 4 wherein the first dynamic line of magnetic induction generating circuit further comprises an energized straight conductor and an energized straight conductor switch; the electrified straight wire is connected with the electrified straight wire switch in series and then is connected with the electrified solenoid coil and the electrified solenoid coil switch in parallel.
6. The dynamic line of magnetic induction demonstration device of claim 3 wherein the dynamic line of magnetic induction generating mechanism further comprises a second dynamic line of magnetic induction generating circuit; the second dynamic magnetic induction line generating circuit comprises a three-phase alternating-current power supply, and a first phase branch, a second phase branch and a third phase branch which are respectively connected with the three-phase alternating-current power supply; the first phase branch, the second phase branch and the third phase branch are connected in parallel; the first phase branch comprises a first phase branch switch and a first phase coil which are connected in series; the second phase branch comprises a second phase branch switch and a second phase coil which are connected in series; the third phase branch comprises a third phase branch switch and a third phase coil which are connected in series; a first-phase coil mounting hole, a second-phase coil mounting hole and a third-phase coil mounting hole are formed in the transparent cover plate; the first phase coil mounting holes, the second phase coil mounting holes and the third phase coil mounting holes are uniformly distributed on the same circumference; the first phase coil, the second phase coil and the third phase coil are respectively arranged in the first phase coil mounting hole, the second phase coil mounting hole and the third phase coil mounting hole in a penetrating mode.
7. The dynamic magnetic induction line demonstration device according to claim 3, further comprising a box body and a mounting plate frame;
the inner side of the box body is provided with a limiting convex edge for supporting the mounting plate frame at the upper end in the box body; the dynamic magnetic induction line generating mechanism is arranged in the box body;
the mounting plate frame is detachably arranged on the limiting convex ribs; the mounting plate frame comprises a C-shaped mounting plate and a closed beam; the inner side of the C-shaped mounting plate is oppositely provided with a guide groove; two ends of the dynamic magnetic induction line demonstration assembly are respectively inserted into the guide grooves; the closed beam is detachably connected with the C-shaped mounting plate and used for limiting the dynamic magnetic induction line demonstration assembly in the guide groove.
8. The dynamic magnetic induction line demonstration device according to claim 7, wherein pin holes are oppositely arranged on the inner sides of the C-shaped mounting plates; mounting holes are respectively formed in two ends of the closed beam; limiting slotted holes communicated with the mounting holes are formed in two ends of the upper side of the closed beam respectively, and the limiting slotted holes are formed along the length direction of the closed beam; a spring pin and a spring which are matched with the pin hole for use are arranged in the mounting hole; one end of the spring pin is used for being inserted into the pin hole, and the other end of the spring pin is abutted to the spring; the spring is in a compressed state; a deflector rod is arranged on the side wall of the spring pin and extends to the upper part of the closed beam through the limiting slotted hole; the closed beam is detachably connected with the C-shaped mounting plate through the spring pin.
9. The dynamic magnetic induction line demonstration device according to claim 8, wherein two ends of the C-shaped mounting plate are respectively provided with a limiting groove; the two ends of the closed beam are respectively provided with a limiting block which is matched with the limiting groove for use and is used for being inserted into the limiting groove; the limiting groove is matched with the limiting block and used for supporting the closed beam on the C-shaped mounting plate, so that the spring pin and the pin hole are coaxially arranged.
10. The dynamic line of magnetic induction demonstration device of claim 7 wherein said mounting plate frame is provided with a handle for easy removal of said mounting plate frame.
Priority Applications (1)
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