CN205351730U - Closed magnetic circuit induction heater - Google Patents
Closed magnetic circuit induction heater Download PDFInfo
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- CN205351730U CN205351730U CN201620032045.1U CN201620032045U CN205351730U CN 205351730 U CN205351730 U CN 205351730U CN 201620032045 U CN201620032045 U CN 201620032045U CN 205351730 U CN205351730 U CN 205351730U
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Abstract
The utility model provides a closed magnetic circuit's induction heater, the container or the water pipe of its heating part constitute closed magnetic circuit, form the vortex through magnetic field response mode in container or water pipe and generate heat to water, wet goods liquid to wherein heat. Compare with traditional electric heater, it has following advantage: 1, realized real liquid electrical isolation through magnetic field, the security is very high, 2, heating area is big, and area of heating surface power density is little, the temperature low, and is little to katogene such as oil decompositions, and is few to the incrustation scale formation of water, 3, container or water pipe self directly generate heat, and it is little to add the heat lag, easily carries out temperature control, 4, the magnetic circuit is closed, and is few to the external radiation, efficient. The industrial heating that can extensively be used for liquid such as various oil, water, acid -base, industrial chemicals also can be used to the gas heating. Can extensively be used for the preparation of electric water heater such as various instant heating type, water storage formula, boiler on civilian.
Description
Technical field
The present invention relates to a kind of electric heater unit, produce eddy current especially with electromagnetic induction and add the heater of hot fluid.
Background technology
Common electric heater is to utilize resistance wire heating power to be heated, and its structure is to wear a resistance wire in a metal tube, and filling chlorinated magnesium powder insulate therebetween.Expanding with heat and contract with cold during due to heating, it is possible to causing that magnesium chloride powder loosens, the direct contacting metal pipe of resistance wire occurring, thus there is electric leakage accident.So planting structure there is potential safety hazard all the time, it is necessary to add the ancillary techniques such as anti-electricity wall to improve safety.Furthermore due to the isolation of magnesium chloride powder, heat transfer postpones relatively big, to wait for a moment during heat-generating pipe power transmission just can be hot, wants the long time just can lower the temperature, have impact on temperature control effect after power-off.Relatively thin additionally, due to metal tube, surface area is little, and power density is big, and during heating, local temperature is high, is easily caused heated material carbonization or rotten.
Electromagnetic induction heating can to a certain degree solve the problems referred to above.Induction coil is wound on water tank by Chinese patent application CN201420655892, though sensing heating can be realized, but uses open magnetic circuit structure, has driving difficulty, radiates the disadvantages such as big.Chinese patent application CN200620083771 uses I-shaped magnetic core to constitute closed magnetic circuit with pipe with spiral pipe, Chinese patent application CN201510362215 uses the E-type magnetic heart to constitute closed magnetic circuit with water tank wall, though to a certain degree improving to some extent, but still have leakage field relatively greatly and the problem of core loss.
Summary of the invention
It is an object of the invention to provide a kind of device, it can produce eddy current to add hot fluid with electromagnetic induction, easily drives simultaneously, at utmost reduces radiation.
The basic structure of device provided by the present invention is made up of inductor and coil.Inductor can be the container containing fluid, it is also possible to be the pipeline of conveyance fluid.Inductor is made up of high magnetic conduction conductive material, and forms at least one of completely closed loop on magnetic circuit, and this loop is all high permeability materials.Coil is then wrapped in as on loop unshakable in one's determination, when coil passes to high frequency electric, produces induced field, and then produces eddy-current heating, fluid therein is heated in the closed circuit of inductor.Additionally for preventing magnetic field exposure, the structural acessories such as import is made up of the material that pcrmeability is low with outlet, fixing, support also use the material that pcrmeability is low to make, and non-conductive, not heat conduction is more preferably.
Most of high-quality steel, carbon steel, cast iron etc. are all high magnetic conduction conductive materials, and ferrite-group stainless steel (such as 430) is also high magnetic conduction conductive material, is applied both to the present invention.The material that pcrmeability is low can be selected for the materials such as austenitic stainless steel (such as 304), copper, aluminum, if intensity, temperature, corrosion resistance etc. meet requirement, engineering plastics are then finer selections.
The concrete structure of device provided by the present invention is: the material that inductor is high by pcrmeability, resistivity is low is made, and inductor self constitutes the iron core of a closed magnetic circuit, has on this iron core of one or more coil encircling；Inlet and liquid outlet are made up of the material that pcrmeability is low.
The another concrete structure of device provided by the present invention is: inductor comprises a concave shape casing (1a) and one section of coil pipe (2), is tightly connected, is all hollow and connection inside both in the breach of coil pipe embedding concave shape casing.
The another concrete structure of device provided by the present invention is: inductor comprises two sections of parallel placements, as the extra heavy pipe road (1b) of water tank, two sections or more coil pipe (2) and end cap (12)；Coil pipe (2) is positioned between two extra heavy pipe roads (1b), is connected with two extra heavy pipe road vertical seal；End cap (12) is positioned at extra heavy pipe road (1b) end face, is tightly connected with extra heavy pipe road；It is all hollow and connection inside each pipe.
The another concrete structure of device provided by the present invention is: inductor, for ease of the single piece of casting, containing upper and lower two cavitys (1d), has the coil pipe (2) of two or more hollow to connect between two cavitys；Upper cavity upward opening, lower chamber is downwardly open, and opening direction is parallel with coil pipe axis；The opening of upper and lower cavity is closed by cover plate (12a).
The another concrete structure of device provided by the present invention is: its coil pipe (2) is divided into two groups, lays respectively at both sides；One of which uneasiness installs coil, and is only used as fluid passage；Another group comprises two or more coil pipe (2), installs equivalent amount coil (3), and these coil currents have appropriate phase, makes this group coil pipe from becoming closed magnetic path.
The another concrete structure of device provided by the present invention is: inductor is made up of two-way or the above pipeline by fluid, and pipeline self constitutes a closed magnetic circuit.Inductor is formed by connecting by two coil pipes (2a) and two heating pipe connected pipe (8), both conductive magneto-conductive materials；Coil (3) on two coil pipes (2a) passes to opposite in phase electric current so that it is self constitutes a closed magnetic circuit；Upper end connecting tube (8) connects water tank (1) by adding heat pipe liquid outlet (7)；Lower end connecting tube (8) connects water tank (1) by adding heat pipe inlet (6)；Lower end connecting tube (8) outside is also equipped with circulating pump (9).
The another concrete structure of device provided by the present invention is: inductor is by U-shaped coil pipe (2b) and adds heat pipe connecting plate (10) and constitutes, and is all conductive magneto-conductive material, constitutes a closed magnetic circuit；There is a cylinder manifold (11), it has groove, inlet (4) and liquid outlet (5) are also installed；Cylinder manifold (11) connects the passage of U-shaped coil pipe (2) and liquid in-out mouth with adding the involutory rear formation of heat pipe connecting plate (10).
The another concrete structure of device provided by the present invention is: inductor is formed by connecting by two or more coil pipes (2c) and two heating pipe connected pipe (8), and both conductive magneto-conductive materials constitute closed magnetic circuit；Coil pipe (2c) is in solenoid shape, and coil (3) passes around in solenoid.Each coil (3) passes around in two solenoids.
In the present invention, owing to electric energy realizes heating by magnetic field induction eddy current, it does not have the directly contact of electricity, safety is significantly high；Owing to chamber wall or duct wall directly generate heat, heat transfer area is big, thermal resistance is little, thermal inertia is little, and heats is faster and better；Owing to the permeability of closed magnetic circuit is far longer than air, induced field is located substantially in inductor, and leakage magnetic field and radiation are only small, very environmental protection；The magnetic resistance of closed magnetic circuit is little, is also easy to drive, and cost is low.
Accompanying drawing explanation
Fig. 1 is embodiment 1, positive displacement basic model induction heater.
Fig. 2 is embodiment 2, little kitchen treasured type induction heater.
Fig. 3 is embodiment 3, double; two pipe symmetric form induction heaters.
Fig. 4 is embodiment 4, and both sides manage asymmetric induction heater.
Fig. 5 is embodiment 5, cast moulding ring induction heater.
Fig. 6 is embodiment 6, and Double-tube cyclic type induction heater is put on side.
Fig. 7 is embodiment 7, quick-heating type induction heater.
Fig. 8 is embodiment 8, spiral double-pipe induction heater.
Fig. 9 is embodiment 9, spiral three pipe induction heater.
Figure 10 is embodiment 10, spiral six pipe induction heater.
In figure: 1, water tank, 1a, concave character type water tank, 1b, double; two tubular type water tank, 1c, both sides' cast water tank, 2, coil pipe, 2a, elbow coil pipe, 2b, U-shaped coil pipe, 2c, solenoid type coil pipe, 3, coil, 4, water tank inlet, 5, water tank liquid outlet, 6, add heat pipe inlet, 7, add heat pipe liquid outlet, 8, heating pipe connected pipe, 9, circulating pump, 10, add heat pipe connecting plate, 11, cylinder manifold, 12, cover plate, 12a, upper mo(u)ld bottom half cover plate
Detailed description of the invention
The detailed description of the invention of the complete closure magnetic circuit induction heater that the present invention proposes is further illustrated below in conjunction with accompanying drawing.
Fig. 1 is the embodiment 1 proposed according to the present invention.It is all hollow as figure, water tank (1) and coil pipe (2) are internal, internal connection water-filling.Water tank (1) and coil pipe (2) collectively form inductor, all make by having ferromagnetic ferritic stainless steel 430, it is clear that they define a closed magnetic circuit, become the iron core of coil.Coil (3) is looped around on coil pipe (2), when wherein passing to high frequency electric, the closed magnetic circuit formed in water tank (1) and coil pipe (2) induces high frequency magnetic field, and then produces eddy-current heating, water therein is heated.Water inlet (4) and outlet (5) are made up of the austenitic stainless steel 304 that pcrmeability is low, are so possible to prevent magnetic field to propagate along pipeline.
The technique of painting in entery and delivery port figure is principle, can require to be adjusted according to upper water-out, lower water outlet etc. in reality, and industry technical staff is not difficult to realize by this.Consider for insulation, the outer coated one layer of heat preservation layer of whole heater, simultaneously also it is prevented that outside magnetic conduction object contact induction body causes magnetic field exposure.It is also required to add the material of insulation and thermal insulation between coil and inductor.Certainly also needing configuring high-frequency power supply, controller, detector etc., this is for industry technical staff's genus known technology.These are also applied for following embodiment, are not repeated to describe.
Fig. 2 is the embodiment 2 proposed according to the present invention.Such as figure, in example 1, water tank (1) is made as the concave character type water tank (1a) of 90-degree rotation, being tightly connected in the groove of coil pipe (2) embedding concave character type, water tank (1a) and coil pipe (2) inside are all hollow, internal connection water-filling.Water tank (1) and coil pipe (2) collectively form inductor, all make by having ferromagnetic ferritic stainless steel, it is clear that they define a closed magnetic circuit.Coil (3) is wound on coil pipe (2), when wherein passing to high frequency electric, the closed magnetic circuit formed in water tank (1b) and coil pipe (2) induces high frequency magnetic field, and then produces eddy-current heating, water therein is heated.Water inlet (4) and outlet (5) are made up of the austenitic stainless steel 304 that pcrmeability is low, are so possible to prevent magnetic field to propagate along pipeline.
Compared with embodiment 1, the structure of this example is compacter, but technique slightly complexity.It is particularly well-suited to the low capacity water heater of little kitchen treasured etc. 2～30 liters.
Fig. 3 is the embodiment 3 proposed according to the present invention.Such as figure, water tank (1b) is made up of the thick pipe of two sections irony and cover plate (12), and coil pipe (2) is made up of two sections, left and right or multistage irony pipe, and thick pipe is parallel couples together by two for coil pipe (2), it is welded to each other firmly, internal connection water-filling.Water tank (1b) and coil pipe (2) collectively form inductor, it is clear that they define a closed magnetic circuit.Coil (3) is wound on coil pipe (2), when wherein passing to anti-phase high frequency electric, the closed magnetic circuit formed in water tank (1b) and coil pipe (2) induces high frequency magnetic field, and then produces eddy-current heating, water therein is heated.Water inlet (4) and outlet (5) are made up of the material that pcrmeability is low, are so possible to prevent magnetic field to propagate along pipeline.
The inside of water tank and coil pipe can carry out anti-corrosion treatment further, such as chromium plating, zinc-plated etc., enamel also can anticorrosion but conduct heat not good enough.Certainly, with rustless steel also can, but owing to itself is relatively big, relatively costly.The two thick pipe both ends of the surface of iron leg matter of the present embodiment are not on Primary magnetic circuit, and magnetic flux is relatively weak, it is possible to do not adopt permeability magnetic material, even plastics.A kind of structure is the two ends machining internal thread of two thick pipes, and end cap is with threaded sealing.After so thick pipe and coil pipe welding, two ends are unlimited, it is easy to carry out the processing such as the polishing of inside, polishing, chromium plating, good manufacturability.
The present embodiment is rational in infrastructure, good manufacturability, is particularly suitable for middle Large Copacity water heater and uses.
Fig. 4 is the embodiment 4 proposed according to the present invention.This example is similar to embodiment 3 structure, is different in that: the thick pipe as water tank changes square tube (1c) into, to increase space availability ratio；There are (or more) coil pipe, coil on it, right side in figure in side；Opposite side has two (or more) coil pipes (2), and it is provided with coil (3), left side in figure；Each coil constitutes closed magnetic circuit.To two coil forms in figure, two the direction of the winding current are contrary, and corresponding transient magnetic field is also contrary, thus constituting closed magnetic circuit；For three-winding type, between coil, electric current is mutually in 120 ° of phase shifts, thus constituting closed magnetic circuit.So, induced field is concentrated mainly on left side, and left field heating can be significantly greater than right side, forms Heated asymmetrically, it is simple to internal water forms convection current.
Fig. 5 is the embodiment 5 proposed according to the present invention.In the present embodiment, upper lower header (1d) and three coil pipes (2) are by the fluid origin entirety of ferrimagnet, it is clear that they define closed magnetic circuit.The cover plate (12) being positioned at both sides in example 3, example 4 becomes above-below direction, so just can be easy to the casting demoulding.Upper and lower two end cover plate (12a) namely forms the enclosed construction of hollow after covering, such as figure.Right side cut away one jiao in figure, in order to observe internal structure.Three coils (3) are wound on coil pipe (2), when wherein passing to three-phase high frequency electric, induce high frequency magnetic field, and then produce eddy-current heating, water therein is heated in inductor in the closed magnetic circuit formed.
This example is shown be three coil forms, equally feasible with two or more coils.This example reference example 4 can also form Heated asymmetrically type water heater.
The present embodiment is rational in infrastructure, good manufacturability, is suitable for various water heaters and uses.
Fig. 6 is the embodiment 6 proposed according to the present invention.Such as figure, water tank (1), coil pipe (2a), heating pipe connected pipe (8), add heat pipe inlet (6) and to add heat pipe liquid outlet (7) internal be all hollow, internal connect water-filling.Two coil pipes (2a) and two sections heating pipe connected pipe (8) collectively form inductor, all make by having ferromagnetic ferritic stainless steel 430, it is clear that they define a closed magnetic circuit.Two coils (3) are wound on coil pipe (2a), Opposite direction connection, when wherein passing to anti-phase high frequency electric, induce high frequency magnetic field, and then produce eddy-current heating, water therein is heated in inductor in the closed magnetic circuit formed.Circulating pump (9) is forced from adding heat pipe inlet (6), water is sent into coil pipe (2), then is returned water tank by adding heat pipe liquid outlet (7), forms circulation, adds heat-flash transmission.
In this example, water tank (1) can participate in heating, it is possible to does not participate in.If adding heat pipe inlet (6) and adding heat pipe liquid outlet (7) and be made up of the material that pcrmeability is low, being so possible to prevent magnetic field to propagate water tank along pipeline, water tank is just not involved in heating.If adding heat pipe inlet (6) and adding heat pipe liquid outlet (7) and water tank is made up of the material that pcrmeability is high, having partial magnetic field and branch to water tank, water tank participates in heating, but heats is more weak.
Fig. 7 is the embodiment 7 proposed according to the present invention.This example is constituted inductor by three U-shaped coil pipes (2b) with adding heat pipe connecting plate (10), is all made up of the ferromagnetic material of conductive magneto-conductive, it is clear that they define three closed magnetic circuits.Cylinder manifold (11) or add and have groove on heat pipe connecting plate (10), after both are involutory, forms the path connecting three U-shaped coil pipes (2b).Three coil pipes (3) are wound on U-shaped coil pipe (2b), when wherein passing to three-phase high frequency electric, induce high frequency magnetic field, and then produce eddy-current heating, fluid therein is heated in inductor in the closed magnetic circuit formed.
The present embodiment is suitable for high-power immediate heating type water heater and uses.
Fig. 8 is the embodiment 8 proposed according to the present invention.In this example, coil pipe (2c) makes solenoid shape, such as figure.Two coil pipes (2c) and heating pipe connected pipe (8), add heat pipe inlet (6) and to add heat pipe liquid outlet (7) internal be all hollow, internal connect topping up body.Two solenoid coil pipes (2c) and two sections heating pipe connected pipe (8) collectively form inductor, all make by having ferromagnetic ferritic stainless steel 430, it is clear that they define a closed magnetic circuit.One coil (3) is across being wound on two coil pipes (2), when wherein passing to high frequency electric, the closed magnetic circuit formed in inductor induces high frequency magnetic field, and then produces eddy-current heating, to flowing through liquid therein or gas is heated.
Add heat pipe inlet (6) and add heat pipe liquid outlet (7) and should be made up of the material that pcrmeability is low, being so possible to prevent magnetic field to propagate along pipeline.
In the present embodiment, coil pipe (2) makes solenoid shape, increases heating surface (area) (HS, reduces power density, is particularly suitable for easily high temperature cabonization, decomposition, the rotten liquid such as various oil, chemical products are heated.Meanwhile, the length of its coil (3) is shorter, it is easy to adopt higher power frequency.
Fig. 9 is the embodiment 9 proposed according to the present invention.This example is similar to embodiment 8, and coil pipe (2c) is also solenoid shape, and simply for adapting to three-phase electricity, coil changes 3 into, such as figure.Three coil pipes (2c) and two heating pipe connected pipe (8), add heat pipe inlet (6) and to add heat pipe liquid outlet (7) internal be all hollow, internal connect topping up body.Three coil pipes (2c) and two sections heating pipe connected pipe (8) collectively form inductor, all make by having ferromagnetic ferritic stainless steel 430, it is clear that they define closed magnetic circuit.Three coils (3) are each across being wound on two coil pipes (2), when wherein passing to three-phase high frequency electric, the closed magnetic circuit formed in inductor induces high frequency magnetic field, and then produces eddy-current heating, to flowing through liquid therein or gas is heated.
Add heat pipe inlet (6) and add heat pipe liquid outlet (7) and should be made up of the material that pcrmeability is low, being so possible to prevent magnetic field to propagate along pipeline.
The present embodiment changes three-phase three tunnel on example 8 basis, can increase power, reduce electromagnetic radiation.
Figure 10 is the embodiment 10 proposed according to the present invention.This example is to change three-phase six tunnel on embodiment 9 basis into, differs only in each coil (3) and individually drives two coil pipes (2c), and all the other structural principles are all identical, do not repeating.
The present embodiment can increase power further, reduce power density, it is adaptable to Large Oil heater.
The above is only presently preferred embodiments of the present invention, not the present invention is imposed any restrictions, and all technical spirit according to the present invention, to any simple modification of above example, equivalents and modification, all still fall within the scope of technical solution of the present invention.
Claims (10)
1. induction heater liquid being heated, is made up of inductor, coil (3), high frequency electric source, controller, and inductor is hollow closed structure, has inlet (4,6) and liquid outlet (5,7), and liquid can be charged therein, it is characterised in that:
The material that inductor is high by pcrmeability, resistivity is low is made, and inductor self constitutes the iron core of a closed magnetic circuit, has on this iron core of one or more coil encircling；
Inlet and liquid outlet are made up of the material that pcrmeability is low.
2. heater according to claim 1, it is characterised in that:
Inductor comprises a concave shape casing (1a) and one section of coil pipe (2), is tightly connected, is all hollow and connection inside both in the breach of coil pipe embedding concave shape casing.
3. heater according to claim 1, it is characterised in that:
Inductor comprise two sections of parallel placements, as the extra heavy pipe road (1b) of water tank, two sections or more coil pipe (2) and end cap (12)；Coil pipe (2) is positioned between two extra heavy pipe roads (1b), is connected with two extra heavy pipe road vertical seal；End cap (12) is positioned at extra heavy pipe road (1b) end face, is tightly connected with extra heavy pipe road；It is all hollow and connection inside each pipe.
4. heater according to claim 1, it is characterised in that:
Inductor, for ease of the single piece of casting, containing upper and lower two cavitys (1d), has the coil pipe (2) of two or more hollow to connect between two cavitys；Upper cavity upward opening, lower chamber is downwardly open, and opening direction is parallel with coil pipe axis；The opening of upper and lower cavity is closed by cover plate (12a).
5. heater according to claim 3 or 4, it is characterised in that:
Its coil pipe (2) is divided into two groups, lays respectively at both sides；One of which uneasiness installs coil, and is only used as fluid passage；Another group comprises two or more coil pipe (2), installs equivalent amount coil (3), and these coil currents have appropriate phase, makes this group coil pipe from becoming closed magnetic path.
6. heater according to claim 1, it is characterised in that:
Inductor is made up of two-way or the above pipeline by fluid, and pipeline self constitutes a closed magnetic circuit.
7. heater according to claim 1 or 6, it is characterised in that:
Inductor is formed by connecting by two coil pipes (2a) and two heating pipe connected pipe (8), both conductive magneto-conductive materials；Coil (3) on two coil pipes (2a) passes to opposite in phase electric current so that it is self constitutes a closed magnetic circuit；
Upper end connecting tube (8) connects water tank (1) by adding heat pipe liquid outlet (7)；Lower end connecting tube (8) connects water tank (1) by adding heat pipe inlet (6)；Lower end connecting tube (8) outside is also equipped with circulating pump (9).
8. heater according to claim 6, it is characterised in that:
Inductor is by U-shaped coil pipe (2b) and adds heat pipe connecting plate (10) and constitutes, and is all conductive magneto-conductive material, constitutes a closed magnetic circuit；Cylinder manifold (11) or add and have groove on heat pipe connecting plate (10), is also provided with inlet (4) and liquid outlet (5)；Cylinder manifold (11) connects the passage of each U-shaped coil pipe (2) and liquid in-out mouth with adding the involutory rear formation of heat pipe connecting plate (10).
9. heater according to claim 6, it is characterised in that:
Inductor is formed by connecting by two or more coil pipes (2c) and two heating pipe connected pipe (8), and both conductive magneto-conductive materials constitute closed magnetic circuit；Coil pipe (2c) is in solenoid shape, and coil (3) passes around in solenoid.
10. heater according to claim 9, it is characterised in that:
Each coil (3) passes around in two solenoids.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620032045.1U CN205351730U (en) | 2016-01-14 | 2016-01-14 | Closed magnetic circuit induction heater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620032045.1U CN205351730U (en) | 2016-01-14 | 2016-01-14 | Closed magnetic circuit induction heater |
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| CN205351730U true CN205351730U (en) | 2016-06-29 |
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| CN201620032045.1U Active CN205351730U (en) | 2016-01-14 | 2016-01-14 | Closed magnetic circuit induction heater |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105485891A (en) * | 2016-01-14 | 2016-04-13 | 朱筱杰 | Induction heater with closed magnetic circuit |
| KR20180036168A (en) * | 2016-09-30 | 2018-04-09 | 오영한 | Boiler using a magnetic induction heat |
| CN112746310A (en) * | 2020-12-29 | 2021-05-04 | 西安交通大学 | Heater generated magnetic field control method suitable for conductive melt flow |
-
2016
- 2016-01-14 CN CN201620032045.1U patent/CN205351730U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105485891A (en) * | 2016-01-14 | 2016-04-13 | 朱筱杰 | Induction heater with closed magnetic circuit |
| KR20180036168A (en) * | 2016-09-30 | 2018-04-09 | 오영한 | Boiler using a magnetic induction heat |
| KR101966400B1 (en) | 2016-09-30 | 2019-04-05 | 오영한 | Boiler using a magnetic induction heat |
| CN112746310A (en) * | 2020-12-29 | 2021-05-04 | 西安交通大学 | Heater generated magnetic field control method suitable for conductive melt flow |
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