KR101811296B1 - high efficient and continuous electric generation cycle device employing ferrofluid - Google Patents

high efficient and continuous electric generation cycle device employing ferrofluid Download PDF

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KR101811296B1
KR101811296B1 KR1020150138054A KR20150138054A KR101811296B1 KR 101811296 B1 KR101811296 B1 KR 101811296B1 KR 1020150138054 A KR1020150138054 A KR 1020150138054A KR 20150138054 A KR20150138054 A KR 20150138054A KR 101811296 B1 KR101811296 B1 KR 101811296B1
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South Korea
Prior art keywords
circulation pipe
magnetic
magnetic fluid
permanent magnets
heater
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KR1020150138054A
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Korean (ko)
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KR20170039018A (en
Inventor
이세희
박종후
김수헌
이종철
이상엽
김세훈
이재선
Original Assignee
경북대학교 산학협력단
한국과학기술연구원
강릉원주대학교산학협력단
울산과학기술원
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N11/00—Generators or motors not provided for elsewhere; Alleged perpetua mobilia obtained by electric or magnetic means
    • H02N11/002—Generators

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Abstract

The present invention relates to a high-efficiency continuous power generation cycle apparatus using a magnetic fluid, and more particularly, to a high-efficiency continuous power generation cycle apparatus using a magnetic fluid, comprising a magnetic fluid as magnetic nanoparticles, a circulation pipe through which the magnetic fluid is circulated, A plurality of permanent magnets are arranged so as to surround an outer side of the coil along a longitudinal direction of the circulation pipe, wherein the adjacent permanent magnets are arranged in the same polarity And a magnetization direction changing section provided so as to face each other.
According to the present invention as described above, a plurality of permanent magnets provided on the circulation pipe face each other with the same polarity so that the nanoparticles of the magnetic fluid are actively disturbed, thereby enhancing power generation efficiency.
Further, there is an effect that the bubble, which is a non-magnetic material, is supplied to the magnetic fluid in a non-homogeneous manner to induce a change in magnetic flux with time, thereby enabling continuous power generation with high efficiency.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a high-efficiency continuous power generation cycle apparatus using a magnetic fluid,

The present invention relates to a high-efficiency continuous power generation cycle apparatus using a magnetic fluid, and more particularly, to an apparatus and a method for improving efficiency of a power generation by improving the arrangement of permanent magnets and supplying bubbles to a magnetic fluid, To a high efficiency continuous power generation cycle apparatus using a magnetic fluid.

Recently, due to the depletion of chemical burning furnaces, there is a growing interest in energy harvesting, which can harvest the waste energy and convert it into electrical energy.

Among them, various research and development for efficiently converting low-temperature heat energy such as waste heat into electric energy are under way. In the conventional heat-electricity conversion cycle, the turbine and the generator are additionally installed in addition to the heat exchanger, , The size of the system becomes large, and it is difficult to recover heat or electric conversion of waste heat of medium and low temperatures in such a conventional heat / electricity conversion cycle.

Recently, a device for circulating a magnetic fluid composed of magnetic particles in a cycle instead of a working fluid to be heat-exchanged to convert electric energy of low temperature into electric energy, and directly converting electric energy into electricity using an induction coil has been developed.

Here, the magnetic fluid is a fluid in which a magnetic powder composed of nanoparticles in a liquid is dispersed in a colloidal state in a liquid state, and then a surfactant is added so as to prevent sedimentation or coagulation. The induction coil is wound on a channel through which a magnetic fluid passes, As a result, the induced electromotive force is obtained by Fleming's right-hand rule.

However, magnetic fluxes are canceled by the disorder and spin generated when the magnetic fluid particles are circulated, and it is difficult to efficiently generate the magnetic flux required to induce the induced electric power.

Techniques for controlling the directionality of the magnetic fluid in order to maximize the magnetic flux by matching the polarity directions of the magnetic fluid particles are proposed.

FIG. 1 shows a device for controlling the directionality of a magnetic fluid of Korean Patent No. 1301945. Referring to FIG. 1, an apparatus for controlling the directionality of a magnetic fluid includes a magnetic fluid 100 The magnetic fluid 100 is passed through the silicon tube 220 at a predetermined interval so as to generate inductive power when the magnetic fluid 100 passes through the inside of the silicone tube 220, And a solenoid coil 230 wound around the solenoid coil 230. The solenoid coil 230 is wound around the solenoid coil 230 so that the magnetic fluid 100 passing through the solenoid coil 230, And a permanent magnet (400) for controlling the magnetic fluid in a single direction in the same direction as the magnetic fluid.

This conventional technique sets the magnetic direction of the permanent magnet 400 to be the same as the flow of the magnetic fluid particles, and the shape of the external permanent magnet is formed into a conical shape in the form of a cone to accelerate the flow, The flow assumes a state in which the particles are dispersed. Such a flow has a serious problem that the position of the magnetic fluid is geometrically fixed with time by the permanent magnet, and the voltage can not be continuously generated.

Accordingly, there is an increasing demand for a continuous power generation cycle device using a magnetic fluid which overcomes the unreasonable point of the power generation cycle apparatus using the conventional magnetic fluid and enables continuous power generation with high efficiency.

Korean Patent No. 1301945

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems as described above, and it is an object of the present invention to provide a permanent magnet which is disposed for the purpose of synchronizing particles of a magnetic fluid, A plurality of permanent magnets are arranged in such a manner that the same polarities are opposed to each other so that the nanoparticles of the magnetic fluid are actively disturbed to enhance the power generation efficiency.

Another object of the present invention is to provide a nonmagnetic material in a magnetic fluid interposed between the permanent magnets so that the nonmagnetic bubbles flow in a nonhomogeneous manner to induce a change in magnetic flux with time to enable continuous power generation with high efficiency .

According to an aspect of the present invention, there is provided a method of manufacturing a magnetic fluid, comprising the steps of: preparing a magnetic fluid as magnetic nanoparticles, a circulation pipe through which the magnetic fluid passes, A plurality of permanent magnets are arranged so as to surround an outer side of the coil along a longitudinal direction of the circulation pipe, and the adjacent permanent magnets are arranged such that the same polarities face each other And a magnetization direction changing section to be installed.

The permanent magnets are disposed in a direction corresponding to the longitudinal direction of the circulation pipe, and the permanent magnets disposed adjacent to each other are arranged to face the same polarities.

The permanent magnets are arranged in a direction perpendicular to the longitudinal direction of the circulation pipe, and the permanent magnets disposed adjacent to each other are disposed such that the directions of the magnetic fields are opposite to each other.

Here, a non-magnetic material is interposed between the permanent magnets.

The non-magnetic material is formed to a thickness of 3 to 7 mm in consideration of the time when the nanoparticles of the magnetic fluid are rearranged.

Further, the present invention is further provided with a bubble generator installed at one side of the circulation pipe to generate bubbles in the circulation pipe.

Wherein the bubble generating means is a heater for heating the magnetic fluid in the circulation pipe.

The heater includes a first heater installed in a circulation pipe located at a lower portion of the induction power generation unit to generate a bubble by heating a magnetic fluid in the circulation pipe, and a circulation pipe installed in a circulation pipe located at an upper portion of the first heater And a second heater for reheating the magnetic fluid so that bubbles generated in the first heater are refined.

The bubble generating means may include a non-magnetic material injecting unit installed at one side of the circulation pipe and injecting gas from the outside into the circulation pipe.

Here, the non-magnetic body injecting portion is located below the induction generating portion, and bubbles supplied into the circulating pipe through the non-magnetic body injecting portion pass through the induction generating portion by buoyancy.

According to the present invention as described above, a plurality of permanent magnets provided on the circulation pipe face each other with the same polarity so that the nanoparticles of the magnetic fluid are actively disturbed, thereby enhancing power generation efficiency.

Further, there is an effect that the bubble, which is a non-magnetic material, is supplied to the magnetic fluid in a non-homogeneous manner to induce a change in magnetic flux with time, thereby enabling continuous power generation with high efficiency.

FIG. 1 is a view showing an apparatus for controlling the directionality of a magnetic fluid of Korean Patent No. 1301945.
FIG. 2 is a schematic diagram illustrating a high-efficiency continuous power generation cycle apparatus using a magnetic fluid according to an embodiment of the present invention.
3 is a partial detail view showing a cross-sectional structure of a portion of the induction power generation unit according to an embodiment of the present invention.
4 is a view showing an example of a first arrangement of permanent magnets in a high efficiency continuous power generation cycle apparatus using a magnetic fluid according to an embodiment of the present invention.
5 is a view showing a magnitude distribution diagram of the axial magnetic flux density according to the first example of the permanent magnet.
6 is a graph showing a generated voltage graph according to the first arrangement example of permanent magnets.
7 is a view showing a second example of arrangement of permanent magnets in a high efficiency continuous power generation cycle apparatus using a magnetic fluid according to an embodiment of the present invention.
8 is a view showing a magnitude distribution diagram of the axial magnetic flux density according to the second arrangement example of the permanent magnets.
9 is a graph showing a generated voltage graph according to the second arrangement example of the permanent magnets.
10 is a perspective view showing a state in which permanent magnets are arranged according to the first arrangement example in the magnetization direction conversion unit according to the present invention.
FIG. 11 is a view showing a direction in which a magnetic fluid moves in a high-efficiency continuous power generation cycle apparatus using a magnetic fluid according to an embodiment of the present invention.
12 is a view showing the structure of a high efficiency continuous power generation cycle apparatus using a magnetic fluid according to another embodiment of the present invention.
FIG. 13 is a graph showing a comparison of generated voltages according to supply of bubbles to a non-magnetic material injecting unit according to another embodiment of the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a schematic view of a high-efficiency continuous power generation cycle apparatus using a magnetic fluid according to an embodiment of the present invention. FIG. 3 is a cross- Detailed view.

Referring to the drawings, a high efficiency continuous power generation cycle apparatus using a magnetic fluid according to an embodiment of the present invention includes a magnetic fluid 10, a circulation pipe 20, a induction power generation unit 30, 40) and a heater (50).

The magnetic fluid 10 is a fluid containing a magnetic nanoparticle powder. When the number of nanoparticles is large, the saturation magnetization value becomes large, which is advantageous for power generation. However, The nonmagnetic material may not be able to pass through the circulation pipe 20 due to the electromagnetic force inside the magnetic fluid 10 and may be stopped when the nonmagnetic material is injected into the magnetic fluid 10, 10) is selected in consideration of the magnetization value of the magnetic particles.

The circulation pipe 20 provides a path through which the magnetic fluid 10 is circulated and the magnetic fluid 10 heated by the heater 50 provided on the lower side of the circulation pipe 20 is connected to the bubble 80 And is pushed upward from the inside of the circulation pipe 20 so as to perform the thermal circulation. The magnetic fluid 10 moving upward moves the induction generator 30 to generate induction electromotive force, circulates to the lower side of the circulation pipe 20, and is heated again by the heater 50 to move upward. The circulation pipe 20 is preferably made of a non-magnetic, low-conductivity metal or a non-metal material in order to minimize the effect of the back electromotive force due to the induction current, while having sufficient heat resistance in consideration of the temperature of the working fluid.

The induction generator 30 winds the predetermined section coil 31 on the outer edge of the circulation pipe 20 along the vertical direction of the circulation pipe 20 at the upper side where the heater 50 is installed in the circulation pipe 20 The induction electromotive force is generated in the coil 31 by the electromagnetic induction law of Faraday while the magnetic fluid 10 passes through the circulation pipe 20 in which the coil 31 is wound. And stores it.

The magnetization direction changing unit 40 disposes the permanent magnet 41 so as to surround the outer side of the coil 31 along the vertical direction of the circulation pipe 20. This permanent magnet 41 synchronizes the polarity direction of the nanoparticles of the magnetic fluid 10. Here, in order to maximize the induced electromotive force in accordance with the Faraday's law, the direction of the magnetic field generated from the nanoparticles of the magnetic fluid 10 must pass perpendicularly to the coil 31. Accordingly, in order to make the magnetization direction of the nanoparticles of the magnetic fluid 10 perpendicular to the end surface of the induction coil 31, the outer periphery of the coil 31 is surrounded by the ring-shaped permanent magnet 41.

In the present invention, in order to induce a high voltage, a plurality of permanent magnets 41 are arranged so that the same polarities of the permanent magnets 41 are opposed to each other in the magnetization direction converting unit 40, so that the magnetic field is changed to make the nanoparticles of the magnetic fluid 10 more active . To this end, the present invention allows highly efficient power generation through the following two embodiments of permanent magnet arrangement.

4 is a view showing a first embodiment of a permanent magnet in a high efficiency continuous power generation cycle apparatus using a magnetic fluid according to an embodiment of the present invention, FIG. 6 is a graph showing a generated voltage graph according to the first embodiment of the permanent magnet. FIG.

Referring to the drawings, in the first embodiment of the permanent magnet 41, the direction in which the permanent magnet 41 is aligned with the longitudinal direction of the circulation pipe 20, that is, the direction in which the nanoparticles of the magnetic fluid 10 are conveyed So that the magnetic field direction is formed in the same direction, and the permanent magnets 41 disposed adjacent to each other are arranged so as to face each other with the same polarity. That is, the permanent magnets 41 are arranged so that the N pole and the N pole, the S pole and the S pole face each other in the vertical direction.

Accordingly, as shown in FIG. 5, the magnitude of the magnetic flux density is small but the change in the magnetic field is large in the outer portion. In FIG. 6, the rate of change of the generated voltage with time is large, and the disturbance of the nanoparticles of the magnetic fluid 10 is actively .

FIG. 7 is a view showing a second embodiment of a permanent magnet in a high-efficiency continuous power generation cycle apparatus using a magnetic fluid according to an embodiment of the present invention, and FIG. 8 is a diagram showing an axial magnetic flux FIG. 9 is a graph showing a generated voltage graph according to the second embodiment of the permanent magnet, and FIG. 10 is a graph showing the magnitude distribution of density when the permanent magnets are arranged in the first arrangement example And FIG.

Referring to the drawings, in the second embodiment of the permanent magnet 41, the direction in which the permanent magnet 41 is orthogonal to the longitudinal direction of the circulation pipe 20, that is, the direction in which the nanoparticles of the magnetic fluid 10 are conveyed The permanent magnets 41 disposed adjacent to each other are arranged so that the directions of the magnetic fields are formed in mutually opposite directions. That is, if one permanent magnet 41 forms a magnetic field in the outer S pole direction from the N pole adjacent to the coil 31, the other permanent magnet 41 adjacent to the permanent magnet 41 is arranged so that the S pole is adjacent to the coil 31, Direction so that the direction of the magnetic field is reversed.

Accordingly, as in the first embodiment, in the second embodiment, the change of the magnetic field is large, and the rate of change of the generated voltage with time becomes large, so that the nanoparticles are disturbed actively.

10, a magnetic fluid 10 moving inside the circulation pipe 20 in which the permanent magnets 41 are disposed is interposed between the permanent magnets 41 so that a separate nonmagnetic material 42 is interposed between the permanent magnets 41, So that the nanoparticles are aligned while passing through the portion where the nonmagnetic body 42 is interposed. The non-magnetic substance 42 is formed to have a thickness of about 3 to 7 mm, more specifically about 5 mm, in consideration of the alignment time of the nanoparticles.

Further, in the present invention, the bubble 80, which is a non-magnetic material, is supplied to the magnetic fluid 10 to increase the efficiency of continuous power generation.

To this end, in one embodiment of the present invention, bubble generating means for generating bubbles 80 in the circulation pipe 20 is installed on one side of the circulation pipe 20. The bubble generating means may generate bubbles 80 by directly heating the magnetic fluid 10 or inject gas such as air, which is a non-magnetic substance, into the circulation pipe 20.

FIG. 11 is a view showing a direction in which a magnetic fluid moves in a high-efficiency continuous power generation cycle apparatus using a magnetic fluid according to an embodiment of the present invention. In an embodiment of the present invention, 50 to heat the magnetic fluid 10 in the circulation pipe 20 to generate the bubble 80. To this end, the heater 50 should be installed in the circulation pipe 20 located below the induction power generation unit 30.

A plurality of heaters 50 may be provided on the other side of the circulation pipe 20 to increase the rate of change of the speed of the nonmagnetic body in the circulation pipe 20 so that the magnetic fluid 10 can be reheated if necessary. A first heater 51 that heats the magnetic fluid 10 in the circulation pipe 20 to generate bubbles and a second heater 51 that is provided in the circulation pipe 20 located above the first heater 51, The fluid 10 is reheated and the bubbles contained therein are made finer so as to increase the rate of change of the nonmagnetic material.

The heated magnetic fluid 10 and the bubbles 80 are moved upward along the circulation pipe 20 and are discharged to the permanent magnet 20 in the magnetizing direction conversion unit 40 provided in the upper side circulation pipe 20 of the heater 50 The nanoparticles of the magnetic fluid 10 are synchronized in one direction along the magnetic field direction of the magnet 41 and the nanoparticles are actively disturbed by the arrangement of the permanent magnets 41. The induction electric power is generated in the coil 31 as the magnetic fluid 10 passes through the coil 31 to which the current is applied. At this time, the bubble 80 is included between the magnetic fluids 10, The changes are made different so that continuous power generation is achieved. In this manner, the induced power generated in the coil 31 is stored in a separate battery.

The magnetic fluid 10 is circulated along the circulation pipe 20 and is then heated again in the heater 50. The heated magnetic fluid 10 passes through the induction generator 30 again by thermal cycling, .

Hereinafter, another embodiment of bubble generating means for injecting a gas such as air, which is a non-magnetic substance, separately in the circulation pipe 20 will be described in detail.

FIG. 12 is a view showing a structure of a high-efficiency continuous power generation cycle apparatus using a magnetic fluid according to another embodiment of the present invention, and FIG. 13 is a graph showing a comparison of generated voltage according to bubble supply to a non- Fig.

Referring to the drawings, another embodiment of the present invention uses a heater 50 to generate bubbles 80, as in the embodiment, and a non-magnetic material injection unit 60 is provided on one side of the circulation pipe 20 So that gas such as air, which is a nonmagnetic substance, is directly injected into the circulation pipe 20. Here, the non-magnetic body may be made of a non-magnetic powder other than the gas. In another embodiment of the present invention, the non-magnetic material injecting portion 60 is located below the induction generating portion 30 and the bubble 80 supplied to the non-magnetic material injecting portion 60 is transferred into the circulating pipe 20 And is transferred to the coil 31 side of the induction power generation section 30 by buoyancy.

In another embodiment of the present invention, a separate pump 70 may be provided to circulate the magnetic fluid 10.

As shown in the graph of FIG. 13, in another embodiment, it is found that the generation voltage at the time of bubble injection into the magnetic fluid (3 to 10 orders of magnitude) is much larger than the generation voltage before the bubble is injected .

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications and variations without departing from the spirit and scope of the invention. Accordingly, the scope of the appended claims should include all such modifications and changes as fall within the scope of the present invention.

10: magnetic fluid
20: Circulation pipe
30: induction generator 31: coil
40: magnetization direction conversion section 41: permanent magnet
42: Nonmagnetic material
50: heater
60: Nonmagnetic body injection part
70: Pump
80: Bubble

Claims (10)

A magnetic fluid that is magnetic nanoparticles;
A circulation pipe through which the magnetic fluid is circulated;
An induction power generator including a coil wound around the circulation pipe at a predetermined interval along a longitudinal direction of the circulation pipe;
A plurality of permanent magnets are arranged so as to surround an outer side of the coil along a vertical direction of the circulation pipe, wherein the permanent magnets are provided so that polarities of the permanent magnets face each other;
A bubble generator installed at one side of the circulation pipe to generate bubbles in the circulation pipe; Including,
Wherein the bubble generating unit includes a non-magnetic body injecting unit installed at one side of the circulation pipe and injecting gas from the outside into the circulation pipe.
The method according to claim 1,
Wherein the permanent magnet has a magnetic field direction in a direction corresponding to a longitudinal direction of the circulation pipe,
Wherein the permanent magnets arranged adjacent to each other are arranged to face each other with the same polarity.
The method according to claim 1,
Wherein the permanent magnet has a magnetic field direction perpendicular to the longitudinal direction of the circulation pipe,
Wherein the permanent magnets disposed adjacent to each other are arranged so that the magnetic field directions are formed in opposite directions to each other.
3. The method according to claim 2 or 3,
And a non-magnetic material is interposed between the permanent magnets.
5. The method of claim 4,
Wherein the non-magnetic material is formed to have a thickness of 3 to 7 mm in consideration of a time when the nanoparticles of the magnetic fluid are rearranged.
delete The method according to claim 1,
Wherein the bubble generating means is a heater for heating the magnetic fluid in the circulation pipe.
8. The method of claim 7,
The heater is installed in a circulation pipe located at a lower portion of the induction power generation unit,
A first heater for heating the magnetic fluid in the circulation pipe to generate bubbles,
And a second heater installed on a circulation pipe located above the first heater for reheating the magnetic fluid so that bubbles generated by the first heater are refined. Device.
delete The method according to claim 1,
Wherein the non-magnetic body injection unit is located at a lower portion of the induction generation unit, and bubbles supplied into the circulation pipe through the non-magnetic body injection unit pass through the induction generation unit by buoyancy.
KR1020150138054A 2015-09-30 2015-09-30 high efficient and continuous electric generation cycle device employing ferrofluid KR101811296B1 (en)

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KR101942041B1 (en) * 2017-12-29 2019-01-24 경북대학교 산학협력단 Generating device using ferrofluid

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004274942A (en) * 2003-03-11 2004-09-30 Ind Technol Res Inst Device and method for magnetic-current power generation and cooling
KR101301945B1 (en) * 2012-05-04 2013-08-30 한국철도기술연구원 Alignment control apparatus of magnetic particles
JP2014050140A (en) * 2012-08-29 2014-03-17 Kri Inc Magnetic fluid drive and heat transport device and force generator using the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004274942A (en) * 2003-03-11 2004-09-30 Ind Technol Res Inst Device and method for magnetic-current power generation and cooling
KR101301945B1 (en) * 2012-05-04 2013-08-30 한국철도기술연구원 Alignment control apparatus of magnetic particles
JP2014050140A (en) * 2012-08-29 2014-03-17 Kri Inc Magnetic fluid drive and heat transport device and force generator using the same

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