CN112054712A - Friction-electromagnetism combined type nanoscale collector based on magnetic suspension ultralow resistance - Google Patents
Friction-electromagnetism combined type nanoscale collector based on magnetic suspension ultralow resistance Download PDFInfo
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- CN112054712A CN112054712A CN202010916747.7A CN202010916747A CN112054712A CN 112054712 A CN112054712 A CN 112054712A CN 202010916747 A CN202010916747 A CN 202010916747A CN 112054712 A CN112054712 A CN 112054712A
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- 239000000725 suspension Substances 0.000 title claims abstract description 23
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 28
- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 24
- 238000010248 power generation Methods 0.000 claims abstract description 24
- 239000011889 copper foil Substances 0.000 claims abstract description 23
- 239000002131 composite material Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 10
- 238000007667 floating Methods 0.000 claims description 4
- 239000011810 insulating material Substances 0.000 claims description 4
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 244000043261 Hevea brasiliensis Species 0.000 claims description 2
- 229920003052 natural elastomer Polymers 0.000 claims description 2
- 229920001194 natural rubber Polymers 0.000 claims description 2
- 239000012528 membrane Substances 0.000 claims 3
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 230000035945 sensitivity Effects 0.000 abstract 1
- 239000010408 film Substances 0.000 description 22
- 238000005516 engineering process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000004020 conductor Substances 0.000 description 3
- 239000002783 friction material Substances 0.000 description 3
- 238000005339 levitation Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000011982 device technology Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N1/00—Electrostatic generators or motors using a solid moving electrostatic charge carrier
- H02N1/04—Friction generators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K35/00—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit
- H02K35/02—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit with moving magnets and stationary coil systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N15/00—Holding or levitation devices using magnetic attraction or repulsion, not otherwise provided for
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Power Engineering (AREA)
- Soft Magnetic Materials (AREA)
Abstract
The invention relates to a friction-electromagnetic combined type nanoscale collector based on magnetic suspension ultralow resistance, and belongs to the field of energy collection. The collector consists of a magnetic suspension unit, an electromagnetic power generation unit and a friction power generation unit; the magnetic suspension unit consists of a magnetic ring and a structural shell; the structure shell is a magnetic ring with the inner wall and the magnetic ring having the same magnetic pole; the electromagnetic power generation unit consists of a cylindrical magnet block and an electromagnetic induction coil which are positioned on the same central line; the electromagnetic induction coil is fixed on the outer side of the elastic film; a circular copper foil is fixed on the inner side of the elastic film; the friction power generation unit consists of a cylindrical magnet block, friction films at two ends of the cylindrical magnet block and a circular copper foil; the circular copper foil and the electromagnetic induction coil are connected through a circuit to form an electrode pair. The invention adopts the suspension magnet as the energy harvester of the collector to eliminate the friction loss and improve the sensitivity of capturing the input energy; meanwhile, the friction and electromagnetic power generation units are integrated, so that the energy conversion efficiency of the collector to external mechanical energy is improved.
Description
Technical Field
The invention belongs to the field of energy collection, and relates to a friction-electromagnetic combined type nanoscale collector based on magnetic suspension ultralow resistance.
Background
With the development of modern science and technology, the continuous update iteration of the mobile terminal and wearable device technology is brought. Mobile terminals and portable wearable devices serving the public are an indispensable part of the life of everyone due to their simple and convenient operation and portability. At present, the scheme of adopting the lithium battery for supplying power has the problems of short service life of power supply, poor maintainability, environmental pollution and the like, and seriously hinders the further development of the mobile terminal and wearable equipment technology. Fortunately, energy harvesting technology is evolving dramatically over the past few years as a promising power solution to replace traditional batteries. The scheme can convert most of energy in the environment into usable electric energy to be supplied to the mobile terminal and the wearable device for use. The power supply solution not only can greatly reduce the problem of environmental hazard caused by the use of the traditional battery, but also can meet the power supply requirement of lifelong maintenance-free, clean and self-driven.
As one of emerging energy collection technologies, the friction nano power generation technology is to generate induced charges on the surface of two materials with different friction coefficients by utilizing friction, and realize charge transfer through an external circuit to generate alternating current, wherein the fundamental principle of the technology is from Maxwell displacement current. The friction nano generator can efficiently convert environmental low-frequency mechanical energy into usable electric energy, but the output current of the friction nano generator is relatively small and cannot directly drive a load, and the coil type electromagnetic generator based on the Faraday's law of electromagnetic induction can be complementary to the friction generator. Therefore, the composite energy collecting device formed by assembling the friction generator and the electromagnetic generator can greatly improve the total output power. At present, the excellent performance of the friction-electromagnetic combined type nano-scale collector is limited by the loss generated by internal friction, and the conversion efficiency of mechanical energy is reduced.
Therefore, a friction-electromagnetic composite nanoscale collector based on magnetic suspension ultralow resistance is needed.
Disclosure of Invention
In view of the above, the invention aims to provide a friction-electromagnetic composite nanoscale collector based on magnetic suspension ultralow resistance, which is used for collecting mechanical energy and outputting mixed energy, and the device has a simple structure and is suitable for unstable application scenes such as motion. Electromagnetic power generation and friction power generation can be realized simultaneously, and each power generation unit does not influence each other, and maneuverability is strong, has reduced inside heat dissipation simultaneously.
In order to achieve the purpose, the invention provides the following technical scheme:
a friction-electromagnetic combined type nanoscale collector based on magnetic suspension ultralow resistance comprises a magnetic suspension unit, an electromagnetic power generation unit and a friction power generation unit;
the magnetic suspension unit consists of a magnetic ring 7 and a structural shell 8; the structural shell 8 is a magnetic ring with the inner wall and the magnetic ring 7 being the same magnetic pole;
the electromagnetic power generation unit consists of a cylindrical magnet block 6 and an electromagnetic induction coil 1 which are positioned on the same central line; the electromagnetic induction coil 1 is fixed on the outer side of the elastic film 2; a circular copper foil 3 is fixed on the inner side of the elastic film 2;
the friction power generation unit consists of a cylindrical magnet block 6, friction films 4 at two ends of the cylindrical magnet block and a circular copper foil 3; the circular copper foil 3 and the electromagnetic induction coil 1 are connected by a circuit to form an electrode pair.
Preferably, the electromagnetic induction coil 1 is located at two ends of the structural shell 8 and is tightly attached to the outside of the elastic film 2.
Preferably, the two ends of the structural shell 8 are opened and sealed by the elastic film 2, and the structural shell is provided with magnetism.
Preferably, the two sides of the cylindrical magnet block 6 are magnetic surfaces, and the cylindrical magnet block is placed inside the magnetic ring 7 and fixed with the magnetic ring 7 into a whole to form the suspension magnet.
Preferably, a structural support 5 is placed between the cylindrical magnet block 6 and the friction film 4 to facilitate sufficient friction.
Preferably, the number of turns of the electromagnetic induction coil 1 is preset and the electromagnetic induction coil is fixed at the center positions of two ends of the structural shell 8, and the diameter of the electromagnetic induction coil 1 is slightly smaller than that of the outer wall of the structural shell 8.
Preferably, the diameter of the friction film 4 is equal to the outer diameter of the magnetic ring 7, and the friction film is made of polytetrafluoroethylene materials.
Preferably, the structural support 5 is made of a cylindrical shape made of an insulating material (such as acryl or plastic) and has a thickness of not more than 1mm, and serves to support, cushion and insulate the friction film 4.
Preferably, the elastic film 2 is made of natural rubber materials, is arranged between the circular copper foil 3 and the electromagnetic induction coil 1, plays an insulating role, and plays a buffering role for the suspension magnet.
Preferably, the diameter of the circular copper foil 3 is slightly smaller than that of the inner wall of the structural shell 8, and the diameter of the circular copper foil is slightly larger than that of the friction film 4, so that the friction material and the friction electrode have double functions.
The invention has the beneficial effects that: the collector has the advantages of ultralow resistance, low energy loss and high energy conversion efficiency, has two modes of electromagnetic power generation and friction power generation, and can avoid the friction force of the movement of the magnet block in the energy collector shell in a specially-made magnetic suspension mode, thereby effectively improving the energy collection and output efficiency. The invention can also be applied to the collection of weak mechanical vibration energy of human bodies and the like, and can be converted into portable low-power-consumption wearable equipment for providing driving electric energy. The friction-electromagnetic combined type nanoscale collector based on the contact independent layer mode comprises a friction nanometer generator and an electromagnetic generator, wherein the friction nanometer generator is composed of a reciprocating motion unit and a pair of friction electrodes and works in the contact independent layer mode, the electromagnetic generator is composed of a magnetic column and a coil, and application scenes of the friction-electromagnetic combined type nanoscale collector are expanded.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a structural appearance diagram of the tribo-electromagnetic hybrid nanoscale collector of the present invention;
FIG. 2 is an internal three-dimensional structure of the tribo-electromagnetic hybrid nanoscale collector of the present invention;
FIG. 3 is a magnetic levitation diagram of the friction-electromagnetic hybrid nanoscale collector of the present invention;
FIG. 4 is an exploded view of the magnetic levitation of the tribo-electromagnetic hybrid nanoscale collector of the present invention;
FIG. 5 is a schematic diagram of the independent layer mode operation of the tribo-electromagnetic hybrid nanoscale collector of the present invention;
reference numerals: 1-electromagnetic induction coil, 2-elastic film, 3-circular copper foil, 4-friction film, 5-structural support, 6-cylindrical magnet block, 7-magnetic ring, 8-structural shell, 9-cylindrical magnetic surface, 10-magnetic ring magnetic surface, 11-external structural magnetic surface.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 5, fig. 1 is a structural diagram of a magnetic levitation based ultra-low resistance friction-electromagnetic composite nanoscale collector provided in the present invention, and fig. 2 is a structural diagram of an internal three-dimensional structure of the collector in fig. 1, as shown in fig. 1 and fig. 2, the collector includes: the device comprises a magnetic suspension unit, an electromagnetic power generation unit and a friction power generation unit. Wherein:
the magnetic suspension unit consists of a structural shell 8 and a magnetic ring 7. The structural shell 8 is open at both ends and sealed by the elastic film 2, and has magnetism.
The electromagnetic power generation unit is composed of a cylindrical magnet block 6, circular copper foils 3 are arranged on the inner sides of elastic films 2 on two sides, and an electromagnetic induction coil 1 is fixed on the outer side of the elastic film 2; the electromagnetic induction coil 1 is positioned at two ends of the structural shell 8 and clings to the outside of the elastic film 2.
The friction power generation unit consists of a cylindrical magnet 6, a friction film 4 at two ends of the cylindrical magnet, a circular copper foil 3 and the friction film 4. The friction film 4 on the outer side of the cylindrical magnet block 6 is in good contact with the circular copper foil 3 in a contact independent layer mode. The circular copper foil 3 and the electromagnetic induction coil 1 are connected by a circuit to form an electrode pair.
The first friction layers are positioned at the two ends of the cylindrical magnet block 6, namely, the structural supports 5 which are arranged between the friction film 4 and the cylindrical magnet block 6 are convenient for full friction. The material of the first friction layer is an insulating material, preferably Polytetrafluoroethylene (PTFE) or other material with strong electronegativity, and the shape of the insulating material is circular.
And the second friction layers are positioned at two ends of the structural shell 8 and cling to the inner side of the elastic film 2. And the first friction layer and the second friction layer form a friction power generation unit. The material selected by the second friction layer is a conductor material, and preferably, the conductor material is a specially-made metal conductor.
Preferably, the cylindrical magnet block 6 is a neodymium iron boron strong magnet, and the outer layer is a magnetic ring, is fixed with the cylindrical magnetic core into a whole, and is placed in the center to form a suspension state.
Preferably, the electromagnetic induction coil 1 is a hollow self-adhesive coil made of an enameled wire and is placed on the elastic thin films 2 at two ends perpendicular to the shell.
As shown in fig. 4, the collector further includes: cylindrical magnetic surface 9, magnetic ring magnetic surface 10 and external structure magnetic surface 11.
As shown in fig. 2 and 3, when external fluid energy and irregular energy act on the part, the collector of the invention can capture external energy, and under the inertia effect of the floating magnet, the floating magnet is driven to reciprocate on the central line, and meanwhile, when the floating magnet moves to two ends and contacts with the copper foil, an independent layer working mode is formed. In the process, the friction force between the friction material 4 and the circular copper foil 3 is the friction in a contact independent layer mode, and simultaneously, induced charges are generated, so that an independent layer friction nano-generator is formed. Induced voltage is generated between the copper foil electrode and the friction material due to different time of friction, and charges can be transferred in a circuit through external circuit connection, so that alternating current is formed. In the same stage, the suspension magnet at the center moves relative to the electromagnetic induction coil 1 fixed outside in the reciprocating process, so that induced electromotive force can be generated at two ends of the coil to form a reciprocating electromagnetic generator. The friction nano generator is characterized by a high-impedance voltage source and low loss of a power distribution carrier; the electromagnetic generator is characterized by a low-impedance current source and strong driving load capacity. Thus, the advantages combine to enhance the total output power of the entire harvester. At this moment, the friction force between the friction layers of the magnetic suspension-based friction-electromagnetic combined type nanometer level collector with ultralow resistance is independent layer friction force which is far smaller than sliding friction force and rolling friction force under nearly similar conditions, so that the heat dissipation inside the collector is greatly reduced, more external energy can be converted into available electric energy, and the energy conversion efficiency of the whole collector is finally improved.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. A friction-electromagnetism combined type nanoscale collector based on magnetic suspension ultralow resistance is characterized in that the collector consists of a magnetic suspension unit, an electromagnetism power generation unit and a friction power generation unit;
the magnetic suspension unit consists of a magnetic ring (7) and a structural shell (8); the structure shell (8) is a magnetic ring with the inner wall and the magnetic ring (7) being the same magnetic pole;
the electromagnetic power generation unit consists of a cylindrical magnet block (6) and an electromagnetic induction coil (1) which are positioned on the same central line; the electromagnetic induction coil (1) is fixed on the outer side of the elastic film (2); a round copper foil (3) is fixed on the inner side of the elastic film (2);
the friction power generation unit consists of a cylindrical magnet block (6), friction films (4) at two ends of the cylindrical magnet block and a circular copper foil (3); the circular copper foil (3) and the electromagnetic induction coil (1) are connected through a circuit to form an electrode pair.
2. The tribo-electromagnetic composite nanoscale collector according to claim 1, wherein the electromagnetic induction coils (1) are located at both ends of the structural shell (8) and tightly attached to the outside of the elastic membrane (2).
3. The tribo-electromagnetic hybrid nanoscale collector according to claim 1, characterized in that the structural shell (8) is sealed at both ends open with elastic membrane (2) and is magnetic.
4. The tribo-electromagnetic composite nanoscale collector according to claim 1, wherein two sides of the cylindrical magnet block (6) are magnetic surfaces, and the cylindrical magnet block is placed inside the magnetic ring (7) and fixed with the magnetic ring (7) into a whole to form a floating magnet.
5. The tribo-electromagnetic composite nanoscale collector according to claim 1, characterized in that a structural support (5) is placed between the cylindrical magnet block (6) and the tribo-film (4) to facilitate sufficient friction.
6. The friction-electromagnetic composite nanoscale collector according to claim 1 or 2, characterized in that the electromagnetic induction coil (1) has a preset number of turns and is fixed at the center of the two ends of the structural shell (8), and the diameter of the electromagnetic induction coil (1) is smaller than that of the outer wall of the structural shell (8).
7. The tribo-electromagnetic composite nanoscale collector according to claim 1 or 5, wherein the diameter of the friction film (4) is equal to the outer diameter of the magnetic ring (7) and is made of polytetrafluoroethylene material.
8. The tribo-electromagnetic composite nanoscale collector according to claim 5, characterized in that the structural support (5) is cylindrical made of insulating material, with a thickness not exceeding 1 mm.
9. The tribo-electromagnetic composite nanoscale collector according to claim 1 or 3, characterized in that the elastic membrane (2) is made of natural rubber material and is located between the circular copper foil (3) and the electromagnetic induction coil (1).
10. The tribo-electromagnetic composite nanoscale collector according to claim 1, characterized in that the diameter of the circular copper foil (3) is smaller than the diameter of the inner wall of the structural shell (8) and the diameter of the circular copper foil is larger than the diameter of the tribo-film (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010916747.7A CN112054712A (en) | 2020-09-03 | 2020-09-03 | Friction-electromagnetism combined type nanoscale collector based on magnetic suspension ultralow resistance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010916747.7A CN112054712A (en) | 2020-09-03 | 2020-09-03 | Friction-electromagnetism combined type nanoscale collector based on magnetic suspension ultralow resistance |
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| CN112054712A true CN112054712A (en) | 2020-12-08 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103546058A (en) * | 2013-10-28 | 2014-01-29 | 北京大学 | Composite type electric generator based on electromagnetism and friction principle |
| CN105915117A (en) * | 2016-04-19 | 2016-08-31 | 中北大学 | Friction-piezoelectricity-magnetoelectricity composite vibration miniature energy collector |
| KR20160148755A (en) * | 2015-06-16 | 2016-12-27 | 한국과학기술원 | Triboelectric/electromagnetic hybrid energy harvester using floating oscillator and opertation method thereof |
| CN108429428A (en) * | 2018-03-08 | 2018-08-21 | 北京大学 | The multi-direction vibration energy collector of electromagnet-friction combined type and its manufacturing method |
| CN109560721A (en) * | 2018-12-04 | 2019-04-02 | 郑州大学 | A kind of combined vibrating energy collecting device |
| CN109787535A (en) * | 2019-02-18 | 2019-05-21 | 中北大学 | A kind of energy gathering devices |
-
2020
- 2020-09-03 CN CN202010916747.7A patent/CN112054712A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103546058A (en) * | 2013-10-28 | 2014-01-29 | 北京大学 | Composite type electric generator based on electromagnetism and friction principle |
| KR20160148755A (en) * | 2015-06-16 | 2016-12-27 | 한국과학기술원 | Triboelectric/electromagnetic hybrid energy harvester using floating oscillator and opertation method thereof |
| CN105915117A (en) * | 2016-04-19 | 2016-08-31 | 中北大学 | Friction-piezoelectricity-magnetoelectricity composite vibration miniature energy collector |
| CN108429428A (en) * | 2018-03-08 | 2018-08-21 | 北京大学 | The multi-direction vibration energy collector of electromagnet-friction combined type and its manufacturing method |
| CN109560721A (en) * | 2018-12-04 | 2019-04-02 | 郑州大学 | A kind of combined vibrating energy collecting device |
| CN109787535A (en) * | 2019-02-18 | 2019-05-21 | 中北大学 | A kind of energy gathering devices |
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