CN100494820C - Permanent magnet system for rotary magnetic refrigeration apparatus - Google Patents
Permanent magnet system for rotary magnetic refrigeration apparatus Download PDFInfo
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- CN100494820C CN100494820C CNB200610165503XA CN200610165503A CN100494820C CN 100494820 C CN100494820 C CN 100494820C CN B200610165503X A CNB200610165503X A CN B200610165503XA CN 200610165503 A CN200610165503 A CN 200610165503A CN 100494820 C CN100494820 C CN 100494820C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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Abstract
The invention relates to a permanent magnet system used in rotary magnetic refrigerator, wherein, the stator comprises a hollow cylinder permanent magnet and a magnetic conductive polar shoe; the hollow cylinder magnet is assembled symmetry around the central axle of the section of magnet via even permanent magnets; the magnetic direction of permanent magnet is decided by Halbach rotation theory; the magnetic conductive polar shoes are formed by two metals with better magnetic conductivity, while one side face is engaged with the wall of the chamber of permanent magnet, while another side is arc; two magnetic conductive polar shoes are contacted on the wall of chamber at the center of N and S polarities, with 180 degree spatial difference. The rotor comprises a rotary axle, a magnetic conductive iron corn and a magnetic medium; the rotary is cylinder; the iron corn is made from magnetic conductive magnet, as the cylinder with central hole or with cut-off two edges, sheathing the rotary axle while the rotary axle is at the center; two magnetic mediums are mounted on two outer arc faces of magnetic conductive iron corn, while the spatial positions are 180 degree different. The invention can be used as rotational permanent magnetic device.
Description
Technical field
The present invention relates to a kind of permanent magnet system, particularly be used for the permanent magnet system of rotary magnetic refrigeration apparatus.
Background technology
Freeze in traditional gas compression refrigeration technology of field extensive use such as household electrical appliance, industrial production, Aero-Space at present, but this technology exists two big defectives: the first, efficient is low, energy consumption is big because of the use compressor causes for the gas refrigeration technology; The second, gas working mediums such as fluorine Lyons and ammonia are adopted in compression refrigeration, and environment is polluted and destroys, fluorine Lyons particularly, the serious threat of the destruction of its caused atmospheric ozone layer is to human existence and safety.In order to solve above-mentioned problem of environmental pollution, fluorine Lyons that people's active development does not destroy atmospheric ozone layer substitutes the floride-free gas working medium of working medium----.Though this class working medium is not destroyed the ozone layer of atmosphere, it has potential greenhouse effects, and can not overcome the big shortcoming of compression refrigeration technology energy consumption, is not the basic way that solves.The important breakthrough of magnetic Refrigeration Technique in the material area research in recent years, i.e. near the discovery of the huge magneto-caloric material of curie point room temperature is for the gate has been opened in the application of magnetic refrigerator.
Magnetic refrigerating system is compared with the extensive gas compression refrigeration of adopting in the refrigerator at air-conditioning with present, it does not need compressor, the core of rotation magnetic refrigerator is a whirligig, and device comprises the runner that contains magnetic refrigerating material and the rare earth permanent magnet magnet of a high magnetic field intensity.In the course of the work, magnetic refrigerator only expends the motor of driving runner and the electric power of water pumper, and the comparable traditional refrigeration modes efficient of its effect is high by about 20%.As it is extensively promoted the use of, just energy savings in large quantities.The magnetic refrigeration does not need fluorine Lyons isothermal chamber gas, and environmental protection is had crucial meaning.In addition, because the density of solid magnetic working medium is more much bigger than refrigerant density commonly used at present, can make magnetic refrigerating system very compact, do not have the sort of vibration and noise under high drive simultaneously, so it have advantages such as volume is little, in light weight, noise is little.
Low temperature magnetic freezes relatively, and room temperature magnetic refrigerating has application widely, and for example: the liquefaction of industry, commerce and domestic air conditioning, refrigerator, hydrogen etc., its extensive use will be played significant role to energy conservation and environmental protection.Therefore, the room temperature magnetic refrigerating technology is regarded as the very good New Refrigerating technology of a kind of application prospect.
The operation principle of magnetic refrigeration is based on the magnetothermal effect of magnetic material (magnetic working material), i.e. during magnetic working medium magnetization to extraneous discharges heat, during demagnetization from extraneous draw heat, thereby reach the refrigeration purpose.Because the magnetization of magnetic refrigerating material realizes by magnet, so magnet is a critical component of magnetic refrigeration apparatus.According to the physical characteristic of magnetic working medium, magnetizing field is strong more, and its magnetothermal effect is remarkable more.In order to make magnetic working medium can produce enough big temperature difference, require magnet can produce enough strong magnetic field.
In history, the magnet system of the high field intensity that magnetic refrigeration model machine adopts all is a superconducting magnet, and the field intensity of 5-7T generally can be provided, superconductor technology fail to reach scale civilian before, its high cost makes the room temperature magnetic refrigerating technology be difficult to extensive use.For production and the operating cost that reduces magnetic refrigerator, people select for use high performance permanent-magnet to replace previous superconducting magnet at present, but adopt the field intensity of the magnet system of NdFeB permanent magnet design generally to be no more than 1.0T, this does not bring into play the magnetothermal effect function of magnetic refrigerating material to a great extent.
In order to obtain the magnetizing field of higher-strength, the refrigeration temperature that increases magnetic refrigerator is striden and refrigeration work consumption, people are on the basis based on the hollow cylindrical magnetic field sources of Halbach rotation theorem, produced the high field intensity NdFeB permanent-magnet of " C " type structure, for example: it is magnet (the Permanent magnet array for the magnetic refrigerator of 1.9T that the S.J.Lee of U.S.'s Ames Lab etc. has designed the field intensity that is suitable for rotating model machine, Journal of AppliedPhysics, Volume 91, Number 10, pp.8894-8896,2002).Though the permanent-magnet of this structure can produce the magnetic field of higher-strength, it exists two shortcomings: the one, and the major part of runner is positioned at outside the permanent-magnet, and this rotary part is not closed, and it will cause difficulty to the structural design of magnetic refrigerator; The 2nd, only some is in the magnetic field of permanent-magnet the circumference of runner, and this will produce very large unilateral magnetic force on runner.When runner rotated, this unilateral magnetic force can cause the vibration of runner, even can damage axle and bearing.
Summary of the invention
The objective of the invention is to overcome " C " type structure permanent magnet system of prior art based on the hollow cylindrical magnetic field sources basis of Halbach rotation theorem, its rotating part is not closed within the magnet and magnetizing field produces shortcomings such as unilateral magnetic force on runner, a kind of high field intensity permanent magnet system that is used to rotate magnetic refrigerator is provided, and this system can produce unusual high-intensity magnetizing field.
Permanent magnet system of the present invention is made up of stator and rotor two parts.
Stator mainly comprises based on the hollow cylindrical permanent-magnet of Halbach rotation theorem and magnetic conductive pole piece two parts.For the convenience of permanent-magnet processing, the cylindrical magnet of hollow can be assembled with the central shaft symmetry on the magnet cross section by the permanent magnets of even number, and the magnetizing direction of these permanent magnets is determined by the Halbach rotation theorem.Magnetic conductive pole piece is made up of two blocks of magnetic property good metal materials, and their side view is consistent with the permanent-magnet internal chamber wall, and the another side is an arc surface.These two magnetic conductive pole pieces are close to respectively on the internal chamber wall at permanent-magnet N, S utmost point center, and the locus differs 180 °.
Rotor mainly comprises rotating shaft, magnetic conductive iron and magnetic working medium three parts.Rotating shaft is cylindrical, is made by metal material, and magnetic conductive iron is made by the high-performance metal permeability magnetic material, is shaped as the cylinder on the cylinder that has centre bore or the both sides of pruning, and is sleeved in the rotating shaft, and rotating shaft is positioned at its center.Magnetic working medium is divided into two, is installed in respectively on two exterior arc surfaces of magnetic conductive iron, and with axial symmetry, its locus differs 180 °.
The major function of each parts in the permanent magnet system is: the permanent magnet magnetization field at the two poles of the earth of the hollow cylindrical magnet of stationary part portion space generation within it, magnetic conductive pole piece in the stator and the magnetic conductive iron in the rotor provide good magnetic conduction path for this permanent magnet magnetization field, and rotating shaft is used for supporting and driving rotor.When the work of rotation magnetic refrigerator, the rotation under external force drives of the rotor of permanent magnet system.When the occupied zone of magnetic working medium rotates to stator pole shoes following time, the magnetic circuit magnetic resistance minimum of permanent-magnet, the most magnetic flux flows that produced are through magnetic working medium, the magnetizing field maximum that is subjected to of magnetic working medium at this moment, its temperature is the highest.Along with the rotation of rotor, the magnetizing field in magnetic working medium zone becomes more and more littler, and magnetic working medium begins demagnetization.When rotor turned over 90 ° of space angles, most magnetic flux flows that permanent-magnet produced were through magnetic conductive iron, and the magnetic working medium of not flowing through, the suffered magnetizing field of magnetic working medium is minimum, this moment, its temperature became minimum.Along with being further rotated of rotor, the suffered magnetizing field of magnetic working medium becomes more and more stronger again, and its temperature also constantly increases.Magnetic working medium is periodically constantly magnetized in the rotary course of rotor and demagnetize, the generation magnetic necessary magnetic thermal power of freezing.
Because the structure of rotor is a symmetry fully, and stator and rotor are concentric, so the radially magnetic pull that the permanent magnet magnetization field is produced on it offsets fully, therefore can not produce unilateral magnetic force.
Permanent magnet system of the present invention is compared with existing systems, advantage such as magnetization field intensity height is arranged, volume is little, in light weight, simple in structure, compact, operational reliability is high, vibration and noise are little.
The present invention also can be used as the high field intensity permanent magnet mechanism of other rotation except being used to rotate the magnetic refrigerator.
Description of drawings
Accompanying drawing is a specific embodiment of the invention structural representation.
The specific embodiment
Further specify the present invention below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the Halbach hollow cylindrical permanent-magnet in the stator is made up of 8 trapezoidal permanent magnets, and its magnetizing direction is determined by the Halbach rotation theorem, shown in arrow among Fig. 1.Magnetic conductive pole piece shape such as arch bridge, its one side shape is consistent with the permanent-magnet internal chamber wall, and another side is a circular arc.Magnetic conductive pole piece lays respectively at the upper and lower side of upper and lower two magnetized permanent magnets of radial direction, is close on the internal chamber wall at permanent-magnet N, S utmost point center, and its pairing center of circle of curved surface arc surface is positioned on the geometric center point of stator.
The axle of rotor is positioned at the centre of rotor position, and the geometric center point of its central point and stator coincides.The cylinder on the both sides of pruning that are shaped as centre bore of rotor magnetic conductive iron, be sleeved in the rotating shaft, its cross section is a microscler zone, two limits of longer dimension are straight line, and two short limits of size are circular arc, and magnetic working medium is fixed on these two circular arcs closely, magnetic working medium is circular arc, certain radial thickness is arranged, and leave certain clearance between stator pole shoes, the big I in gap requires to determine according to the machinery of rotor rotation.
In magnetic refrigerator when work,, the rotor of permanent magnet system is along certain direction (clockwise or counterclockwise) rotation, and when the occupied zone of magnetic working medium is positioned at stator pole shoes following time, magnetic working medium is subjected to very big magnetizing field, makes the magnetization of magnetic working material, and its temperature raises.Along with the rotation of rotor, the magnetizing field in magnetic working medium zone becomes more and more littler, and magnetic working medium begins demagnetization.When rotor turned over 90 ° of space angles, the suffered magnetizing field of magnetic working medium was minimum, and this moment, its temperature became minimum.Along with being further rotated of rotor, the suffered magnetizing field of magnetic working medium becomes more and more stronger again, and its temperature also constantly increases.When rotor turned over 180 ° of space angles, magnetization of magnetic working medium and demagnetization process were finished once circulation, and its variations in temperature has also been finished once circulation, can utilize this variation of temperature to realize refrigeration.
According to physical dimension ratio shown in Figure 1, adopt the NdFeB50 permanent-magnet material, permanent magnets is high by 36, radial clearance 7 between magnetic conductive pole piece internal diameter 108, magnetic conductive pole piece and the rotor magnetic conductive iron, magnetic working medium is positioned at the magnetizing field field intensity that stator magnetic conductive pole piece following time is subjected to and reaches 2.3T, and the magnetizing field field intensity that magnetic working medium is subjected between stator two magnetic conductive pole pieces the time is less than 0.1T.If increase the relative physical dimension of permanent magnets, magnetic working medium is positioned at stator magnetic conductive pole piece suffered magnetizing field field intensity of following time will further be increased.For this structure, the radially magnetic pull that the permanent magnet magnetization field is produced on rotor is zero.
Claims (3)
1, a kind of permanent magnet system for rotary magnetic refrigeration apparatus comprises stator and rotor, it is characterized in that stator mainly comprises hollow cylindrical permanent-magnet and magnetic conductive pole piece two parts; The cylindrical magnet of hollow is assembled with the central shaft symmetry on the magnet cross section by the permanent magnets of even number, and the magnetizing direction of permanent magnets is determined by the Halbach rotation theorem; Magnetic conductive pole piece is made up of two blocks of magnetic property good metal materials, and two magnetic conductive pole pieces are close to respectively on the internal chamber wall at permanent-magnet N, S utmost point center, and the locus differs 180 °; Rotor mainly comprises rotating shaft, magnetic conductive iron and magnetic working medium three parts; Rotating shaft is cylindrical, is made by metal material, and magnetic conductive iron is made by the high-performance metal permeability magnetic material, is shaped as the cylinder on the cylinder that has centre bore or the both sides of pruning, and is sleeved in the rotating shaft, and rotating shaft is positioned at its center; The central point of rotating shaft and the geometric center point of stator coincide; Magnetic working medium is divided into two, is installed in respectively on two exterior arc surfaces of magnetic conductive iron, and with axial symmetry, its locus differs 180 °.
2, according to the described permanent magnet system for rotary magnetic refrigeration apparatus of claim 1, it is characterized in that magnetic conductive pole piece shape such as arch bridge, the one side view is consistent with the permanent-magnet internal chamber wall, and the another side is a circular arc; Magnetic conductive pole piece lays respectively at the upper and lower side of upper and lower two magnetized permanent magnets of radial direction, and combines with the permanent-magnet internal chamber wall, and its pairing center of circle of curved surface arc surface is positioned on the geometric center point of stator.
3, according to the described permanent magnet system for rotary magnetic refrigeration apparatus of claim 1, the cross section that it is characterized in that the rotor magnetic conductive iron is a microscler zone, two limits of longer dimension are straight line, two short limits of size are circular arc, two circular arc magnetic working medium are fixed on these two circular arcs closely, magnetic working medium has certain radial thickness, and leaves the gap between magnetic conductive pole piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610165503XA CN100494820C (en) | 2006-12-21 | 2006-12-21 | Permanent magnet system for rotary magnetic refrigeration apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610165503XA CN100494820C (en) | 2006-12-21 | 2006-12-21 | Permanent magnet system for rotary magnetic refrigeration apparatus |
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| Publication Number | Publication Date |
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| CN101012985A CN101012985A (en) | 2007-08-08 |
| CN100494820C true CN100494820C (en) | 2009-06-03 |
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| CNB200610165503XA Expired - Fee Related CN100494820C (en) | 2006-12-21 | 2006-12-21 | Permanent magnet system for rotary magnetic refrigeration apparatus |
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100526760C (en) * | 2007-10-19 | 2009-08-12 | 中国科学院电工研究所 | Heat exchange system of permanent magnetism rotary type magnetic refrigerating device |
| CN101373113B (en) * | 2008-09-26 | 2010-12-08 | 中国科学院电工研究所 | Permanent magnetism body system for rotary magnetic refrigeration |
| CN101441009B (en) * | 2008-12-19 | 2010-12-08 | 中国科学院电工研究所 | Heat exchange system of permanent magnetism rotary type magnetic refrigerating machine |
| JP5409800B2 (en) * | 2009-10-19 | 2014-02-05 | 三菱電機株式会社 | Method for manufacturing permanent magnet motor |
| CN102110523B (en) * | 2010-12-22 | 2012-08-15 | 北京中科科仪技术发展有限责任公司 | Magnet assembling device |
| CN103148634B (en) * | 2011-12-07 | 2015-06-24 | 南京大学 | Rotary type room-temperature magnetic refrigerator based on AMR (active magnetic regenerator) |
| CN104776631B (en) * | 2014-01-13 | 2017-06-20 | 海尔集团公司 | Rotary magnetic refrigeration part and magnetic refrigeration apparatus |
| CN105020927B (en) * | 2014-04-21 | 2019-05-07 | 青岛海尔股份有限公司 | Reciprocating magnetic refrigeration part and magnetic refrigeration apparatus |
| CN104006079B (en) * | 2014-05-07 | 2016-04-20 | 西安理工大学 | The Halbach taper Permanent-magnet bearing that triangular-section permanent-magnetic clamp is formed |
| DE102016110385A1 (en) * | 2016-06-06 | 2017-12-07 | Technische Universität Darmstadt | Cooling device and a method for cooling |
| CN106373701B (en) * | 2016-09-09 | 2018-05-01 | 南京大学 | A kind of combined type room-temperature magnetic refrigerator two-chamber permanent magnetic field system |
| CN109210894B (en) * | 2018-10-26 | 2023-09-26 | 北京交通大学 | Asphalt rotating film drying device |
| CN112146306A (en) * | 2020-09-27 | 2020-12-29 | 叶剑春 | Permanent magnet type magnetic refrigerator using AMR technology as core |
| CN112594963A (en) * | 2020-12-31 | 2021-04-02 | 包头稀土研究院 | Cylindrical array type magnet for room temperature magnetic refrigerator and assembling method thereof |
| CN114353432B (en) * | 2021-04-16 | 2024-03-22 | 河南中科清能科技有限公司 | Hydrogen liquefying device adopting magnetic refrigeration |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1605009A (en) * | 2001-12-12 | 2005-04-06 | 美国宇航公司 | Rotating magnet magnetic refrigerator |
| JP2005168086A (en) * | 2003-11-28 | 2005-06-23 | Sankyo Seiki Mfg Co Ltd | Method of magnetizing permanent magnet of concentrated winding type motor, and concentrated winding type motor |
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2006
- 2006-12-21 CN CNB200610165503XA patent/CN100494820C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1605009A (en) * | 2001-12-12 | 2005-04-06 | 美国宇航公司 | Rotating magnet magnetic refrigerator |
| JP2005168086A (en) * | 2003-11-28 | 2005-06-23 | Sankyo Seiki Mfg Co Ltd | Method of magnetizing permanent magnet of concentrated winding type motor, and concentrated winding type motor |
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| CN101012985A (en) | 2007-08-08 |
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Granted publication date: 20090603 Termination date: 20131221 |