CN202615958U - Permanent magnet device for strengthening radial magnetic field - Google Patents
Permanent magnet device for strengthening radial magnetic field Download PDFInfo
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- CN202615958U CN202615958U CN 201220197004 CN201220197004U CN202615958U CN 202615958 U CN202615958 U CN 202615958U CN 201220197004 CN201220197004 CN 201220197004 CN 201220197004 U CN201220197004 U CN 201220197004U CN 202615958 U CN202615958 U CN 202615958U
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- permanent magnet
- magnetic field
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- radial magnetic
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Abstract
The utility model relates to a permanent magnet system and particularly relates to a permanent magnet device for strengthening a radial magnetic field. The permanent magnet system device for strengthening the radial magnetic field comprises a permanent magnet outer ring conforming to the Halbach rule, a permanent magnet inner core is arranged in the outer ring and structurally comprises a central square permanent magnet, two sector-shaped permanent magnets arranged on the upper side and the lower side of the central square permanent magnet, four trapezoidal permanent magnets distributed on the two sides of the sector-shaped permanent magnets and two trapezoidal permanent magnets arranged on the left side and the right side of the central square permanent magnet. The permanent magnet device for strengthening the radial magnetic field provides an operation space specific to a magnetic cooling medium, can be used for developing a magnetic cooling machine, also can be used for the testing of the mechanical stability of magnetic media, and the corrosion behavior research of the magnetic media in the magnetic field environment, and is also used for inspecting the mechanical training and the fatigue behavior of magnetically controlled shape memory alloys.
Description
One, technical field:
The utility model relates to a kind of permanent magnet systems, is specifically related to a kind of permanent magnet device of strengthening radial magnetic field.
Two, background technology:
Refrigeration Technique all is applied in many fields of national economy, like cryogenic engineering, petrochemical industry, high-energy physics, Aero-Space and medicine equipment etc.Present refrigerating method mainly contains: the cold effect refrigeration that gas expands and produces, the endothermic effect refrigeration of phase transformation (like thawing, liquefaction, distillation and magnetic phase transition) and semi-conductive thermoelectric effect refrigeration.Wherein general to realize freezing based on the expansion of compressed gas technology, but the freon that in process of refrigerastion, uses greatly destroys atmospheric ozone layer.The magnetic cooling technology that grows up over past ten years is based on the magneto-caloric effect of magnetic material, i.e. get rid of heat to the external world during magnetic working medium magnetization, absorbs heat from the external world during demagnetization, thereby reaches the refrigeration purpose.Because the magnetization of material and demagnetization can not cause greenhouse effect, so the magnetic cooling technology is called as the environmental protection Refrigeration Technique.In addition, with traditional gas refrigeration technology relatively, magnetic cooling has low noise, efficient is high, power consumption is low, pollution-free, safe and reliable and be easy to characteristics such as miniaturization.Exploitation high-performance magnetism material of cooling has become various countries' researcher with the efficient magnetic refrigerator of development and industrial quarters is competed the focus work of carrying out.
Because the cold cycling process of magnetic refrigerator relies on magnetic working medium to pass in and out magnetic field repeatedly and accomplishes, so magnet design is the key point of magnetic refrigeration apparatus.The temperature difference that produces when making magnetic working medium turnover magnetic field is remarkable, require the highfield district of magnet can produce enough strong magnetic field, and the magnetic field intensity in the downfield district of magnet is zero as far as possible.The kicker magnet design of generally adopting at present is mainly based on following two aspects: " C " type magnet and Halbach magnet ring.Because " C " the type magnet not exclusively seals, can produce monolateral pulling force when magnetic working medium is rotated therein and cause the runner vibration, thereby damage bearing, so this magnet design is unsatisfactory.Comparatively speaking, the Halbach sealing magnet ring with symmetrical structure both can provide high downfield evenly to distribute, and can overcome unilateral magnetic force again, was that a kind of feasible magnetic refrigerator is used magnet structure.In the bitubular four polar form Halbach magnet rings of researcher's utility model of Denmark University of Science and Technology, downfield is almost 0 tesla, and the place angular distribution is 40 degree; The highfield is 1 tesla, and the place angular distribution only has 10 degree [1].Field regions concentrates scope little, and especially high electric field area is narrow, to a great extent limit the rotary speed of magnetic working medium in the space, magnetic field, finally reduce the magnetic refrigerator running efficiency.In addition, for enlarging the angular distribution scope of highfield, the researcher has increased the design of soft iron in outer magnetic ring, make that the difficulty of processing of magnet increases unusually [2].
About 1.5% volumetric expansion takes place in magnetic working medium when magnetizing like ferrous alloy LaFeSi, demagnetization back volume contraction repeatedly after the magnetization demagnetization, very easily ruptures.The alternating magnetic field that designs a height switching also is vital for the mechanical stability of investigating magnetic working medium.
In addition, as the magnetic control shape memory alloy of high frequency brake, obtain mechanical training after repeatedly magnetizing demagnetization like the NiMnGa alloy, its strain value can be improved largely.But tens thousand of above magnetization distortion can cause its fatigue fracture.Effective magnet trainer is very necessary for the performance optimization of magnetic control shape memory alloy.
Three, utility model content:
The utility model is in order to solve the weak point in the above-mentioned background technology; A kind of permanent magnet device of strengthening radial magnetic field is provided, and it overcomes the defective of Halbach magnet ring in the past, can produce high magnetic field intensity; Enlarge the magnetic field radiation area, reduce design difficulty and manufacturing cost.
For realizing above-mentioned purpose; The technical scheme that the utility model adopts is: a kind of permanent magnet device of strengthening radial magnetic field; It is characterized in that: comprise the permanent magnet outer shroud; Be provided with the permanent magnet inner core in the described outer shroud, the structure of described permanent magnet inner core is by a central square permanent magnet and be arranged at the central square permanent magnet up and down two blocks of fan-shaped permanent magnets on both sides and four blocks of trapezoidal permanent magnets that are distributed in fan-shaped permanent magnet both sides constitute with two blocks of trapezoidal permanent magnets that are arranged at central square permanent magnet the right and left.
Said permanent magnet inner core is positioned at the center of permanent magnet outer shroud.
Said permanent magnet outer shroud by even number amount permanent magnets along the circumference assembly unit that evenly distributes.
Said permanent magnet outer shroud is by being used to be provided with the outer fixed part of each permanent magnet monomer and the installation portion one at two ends.
Said permanent magnet inner core comprises and is used to be provided with each permanent magnetic monomers installation portion two.
Be provided with through hole between permanent magnet outer shroud and the permanent magnet inner core.
Outer fixed part is the soft magnetism sleeve.
Compared with prior art; Advantage and the effect that the utlity model has are following: the utility model is to magnetic cooling medium; Apron space is provided, can be used for developing the magnetic refrigeration machine, also can be used for testing magnetic working medium mechanical stability; And the corrosion behavior research of magnetic working medium under magnetic field environment, the magnet apparatus of the utility model also can be in order to investigate the mechanical training and the fatigue behaviour of magnetic control shape memory alloy.
Four, description of drawings:
Fig. 1 is the structural representation of the utility model;
Fig. 2 is the A one A cutaway view of the utility model;
Fig. 3 goes out the magnet cross section and the state diagram of magnetizing for the utility model;
Five, embodiment:
Referring to Fig. 1 and Fig. 2: a kind of permanent magnet device of strengthening radial magnetic field; Comprise the permanent magnet outer shroud 1 in the reinforcement magnetic field that meets the Halbach rule and be arranged at the permanent magnet inner core 2 that has the confining magnetic field direction in the permanent magnet outer shroud 1; Said permanent magnet outer shroud 1 by even number amount permanent magnets along the circumference assembly unit that evenly distributes; Its magnetizing direction confirms that by the Halhach principle can be provided with bipolar or the multipole magnetic field direction, said permanent magnet inner core 2 is positioned at the center of outer shroud magnetic core; Constitute by polylith permanent magnet and high-performance soft magnetic materials; The permanent magnet magnetizing direction is confirmed by the Halhach principle, can be bipolar or multipole according to the outer shroud relative set, and said permanent magnet outer shroud 1 is by being used to install the outer fixed part 3 of each permanent magnet monomer and the installation portion 1 at two ends; Said permanent magnet inner core 2 comprises and is used to be provided with each permanent magnetic monomers installation portion 25, is provided with through hole 6 between said permanent magnet outer shroud 1 and the permanent magnet inner core 2.
The permanent magnet outer shroud adds inner core permanent magnet and the compound double-decker of magnetic conductive soft iron, and interlayer is an air-gap, in order to the apron space of magnetic cooling medium to be provided.Through conversion outer shroud permanent magnet magnetizing direction, it is bipolar or multipole that overall structure can be set.
Permanent magnet outer shroud 1 is along the circumferential direction evenly distributed by some even number amounts watt shape permanent magnets and is assemblied to form, and magnetizing direction is confirmed by the Halbach rotation theorem.The magnet ring periphery is close to a soft magnetism sleeve, in order to fixing outer magnetic ring, and has the effect of the polymerization magnetic line of force.
Permanent magnet inner core 2 is made up of a central square permanent magnet, two fan-shaped permanent magnets, four trapezoidal permanent magnets and two fan-shaped magnetic property good metal soft iron material, is nearly oval structure on the vertical view and is symmetrically distributed.All permanent magnet magnetizing directions are consistent with the long axis direction of nearly oval structure in the inner core.
With two electrode structures is example, and Fig. 3 illustrates the magnet cross section and the state that magnetizes.Outer shroud is that 16 permanent magnetic tile shape bodies are formed along circle distribution.On the quadrant, the magnetizing direction of upper and lower side magnet is vertical with tangent to periphery, and direction down; The magnetizing direction of left and right sides magnet is parallel with tangent to periphery, is directed upwardly; The three magnetic shoe magnetizing directions of therebetween and the angle of tangent to periphery are respectively 67.5,45 and 22.5.The both sides trapezoid elements is the soft magnetism yoke in the inner core, and remaining part is a permanent magnet.
The magnetic force distribution of above-mentioned two electrode structure magnets is shown in Fig. 3.In the air-gap of magnetic working medium running, the highfield is 1.2 teslas, and the magnetic field radiation zone reaches 22.5; Downfield is 0 tesla, and the magnetic field radiation zone reaches 157.5.And magnetic field distribution is even.Compare with magnet with rotation magnetic refrigerator in the past, the utility model provides the area in uniform high strength magnetic field big, can arrange a plurality of heat-exchange systems, and rotation magnetic working medium also can obtain enough heat-exchange times under at a high speed, greatly improves refrigerating efficiency thus.In addition, the magnet structure of the utility model is an open system, and heat exchanging fluid can directly feed in the heat exchange unit in the high high-intensity magnetic field.
Specify the function of the utility model magnet below in conjunction with the magnetic refrigerator course of work and Fig. 3.Magnetic working medium is the axle center with interior permanent magnet, makes circular motion in the air-gap between interior outer magnet.When magnetic working medium rotates to the fan-shaped permanent magnet of inner core position; Get into the highfield district, magnetic working medium is magnetized, and emits heat and causes magnetic working medium temperature to raise; Before withdrawing from the highfield district; Take away the heat of increase through coolant, magnetic working medium temperature reduces, and injecting coolant immediately rapidly is that kind of refrigeration cycle is prepared.This process is determined by magnetic working medium rotating speed and highfield region area jointly.After magnetic working medium withdraws from the highfield; Rotate to immediately by 2 trapezoidal permanent magnets and 1 downfield zone that trapezoidal soft magnetic bodies splicing produces; Magnetic working medium absorption heat causes temperature to reduce in the demagnetization process, and coolant and the magnetic working medium injected are in advance carried out the secondary heat exchange.Coolant temperature reduces, and this heat-exchange time is by magnetic working medium rotating speed and the decision of downfield region area.Magnetic working medium passes in and out high downfield so repeatedly, constantly carries out heat exchange, reaches the effect of continuous cooling.
According to geometric proportion shown in Figure 3, adopt NdFeB-N53 model permanent magnet material, the magnetic conduction soft magnetism is used pure iron.Design permanent magnet height is 100mm, permanent magnet outer shroud external diameter 220mm, and internal diameter 180mm, the narrowest place of air-gap is 11mm, and high magnetic field intensity is 1.2T, and downfield is near 0T.
Claims (7)
1. permanent magnet device of strengthening radial magnetic field; It is characterized in that: comprise permanent magnet outer shroud (1); Be provided with permanent magnet inner core (2) in the described permanent magnet outer shroud (1), the structure of described permanent magnet inner core (2) is by a central square permanent magnet and be arranged at the central square permanent magnet up and down two blocks of fan-shaped permanent magnets on both sides and four blocks of trapezoidal permanent magnets that are distributed in fan-shaped permanent magnet both sides constitute with two blocks of trapezoidal permanent magnets that are arranged at central square permanent magnet the right and left.
2. a kind of permanent magnet device of strengthening radial magnetic field according to claim 1 is characterized in that: said permanent magnet inner core (2) is positioned at the center of permanent magnet outer shroud (1).
3. a kind of permanent magnet device of strengthening radial magnetic field according to claim 1 and 2 is characterized in that: said permanent magnet outer shroud (1) by even number amount permanent magnets along the circumference assembly unit that evenly distributes.
4. a kind of permanent magnet device of strengthening radial magnetic field according to claim 3 is characterized in that: said permanent magnet outer shroud (1) is by being used to be provided with the outer fixed part (3) of each permanent magnet monomer and the installation portion one (4) at two ends.
5. a kind of permanent magnet device of strengthening radial magnetic field according to claim 4 is characterized in that: said permanent magnet inner core (2) comprises and is used to be provided with each permanent magnetic monomers installation portion two (5).
6. a kind of permanent magnet device of strengthening radial magnetic field according to claim 5 is characterized in that: be provided with through hole (6) between permanent magnet outer shroud (1) and the permanent magnet inner core (2).
7. a kind of permanent magnet device of strengthening radial magnetic field according to claim 4 is characterized in that: outer fixed part (3) is the soft magnetism sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220197004 CN202615958U (en) | 2012-05-04 | 2012-05-04 | Permanent magnet device for strengthening radial magnetic field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220197004 CN202615958U (en) | 2012-05-04 | 2012-05-04 | Permanent magnet device for strengthening radial magnetic field |
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| Publication Number | Publication Date |
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| CN202615958U true CN202615958U (en) | 2012-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220197004 Expired - Lifetime CN202615958U (en) | 2012-05-04 | 2012-05-04 | Permanent magnet device for strengthening radial magnetic field |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103480839A (en) * | 2013-10-08 | 2014-01-01 | 镇江宝纳电磁新材料有限公司 | Orientation device for magnetic metal powder |
| CN114023524A (en) * | 2022-01-04 | 2022-02-08 | 绵阳和一磁电有限公司 | Thin-wall inner circle oriented multi-pole magnetic ring and manufacturing method thereof |
-
2012
- 2012-05-04 CN CN 201220197004 patent/CN202615958U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103480839A (en) * | 2013-10-08 | 2014-01-01 | 镇江宝纳电磁新材料有限公司 | Orientation device for magnetic metal powder |
| CN103480839B (en) * | 2013-10-08 | 2015-12-23 | 镇江宝纳电磁新材料有限公司 | The orienting device of magnetic metallic powder |
| CN114023524A (en) * | 2022-01-04 | 2022-02-08 | 绵阳和一磁电有限公司 | Thin-wall inner circle oriented multi-pole magnetic ring and manufacturing method thereof |
| CN114023524B (en) * | 2022-01-04 | 2022-03-25 | 绵阳和一磁电有限公司 | Thin-wall inner circle oriented multi-pole magnetic ring and manufacturing method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160513 Address after: 200240, Room 305, building B, material building, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, Minhang District Patentee after: Xia Mingxu Patentee after: Liu Jian Address before: The western part of Shaanxi province 710068 South Second Ring Road, Xi'an City No. 69 Beilin District People's Congress Office Room 804 Patentee before: Xi'an Jiawen Material Technology Co., Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121219 |