CN103901372A - Permanent magnet and rack thereof - Google Patents
Permanent magnet and rack thereof Download PDFInfo
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- CN103901372A CN103901372A CN201310638180.1A CN201310638180A CN103901372A CN 103901372 A CN103901372 A CN 103901372A CN 201310638180 A CN201310638180 A CN 201310638180A CN 103901372 A CN103901372 A CN 103901372A
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Abstract
The invention provides a permanent magnet and a rack of the permanent magnet. The weight of the rack can be reduced, and meanwhile it is guaranteed that a magnetic line for force can be effectively contracted. The rack comprises an inner frame and an outer shell covering the inner frame, the inner frame and the outer shell are both made of magnetic conductive materials, a clearance is reserved between the inner frame and the outer shell and is filled with non-magnetic-conductive media, and the density of the non-magnetic-conductive media is smaller than that of the magnetic conductive materials. The clearance is reserved between the inner frame and the outer shell so that the clearance can be filled with the non-magnetic conductive media, and therefore the magnetic line for the force is effectively prevented from expanding outwards, and the function of contracting five Gaussian lines is achieved. Due to the fact that the outer shell is made of the magnetic conductive materials, even though a small part of the magnetic lines for the force is expanded outwards, a magnetic conductive magnetic circuit can be formed through the guide of the outer shell, then a central magnetic field is surrounded, and the function of enhancing field intensity and lowering outward expansion of the magnetic lines for force is achieved. The density of the non-magnetic-conductive media is obviously smaller than that of the magnetic conductive materials, the overall weight of the rack can be reduced, and therefore transportation is convenient.
Description
Technical field
The present invention relates to nuclear magnetic resonance technique field, particularly relate to a kind of frame of permanent magnet.The invention still further relates to a kind of permanent magnet with above-mentioned frame.
Background technology
Nmr imaging technique (Magnetic Resonance Imaging is called for short MRI) is a kind of detection means without wound and multiparameter, is widely used in many fields such as medical test, research and production.At biomedical sector, MRI not only can provide the various images about human body soft tissue, can also reflect metabolic situation wherein, is a kind of powerful image technology; Also be a kind of foolproof image technology, the magnetic field of use is harmless, is applicable to the colony of any age bracket simultaneously.
NMR system is divided into the type of often leading, superconduct and permanent-magnet type according to the producing method of main field.Wherein, permanent-magnet is the topmost ingredient of Permanent magnetic MR system, is mainly made up of magnetic pole, shimming plate and frame; Magnetic pole is used for producing the required main field of magnetic resonance system; The effect of shimming plate is level and smooth pole surface, and pre-uniform treatment is made in the magnetic field that magnetic pole is produced; The effect of frame is to support whole magnet framework, forms magnetic conduction magnetic circuit, reduces leakage field.
Take the permanent magnet of 0.35T that can scan whole body all sites as example, 20 tons of magnet weight, 15 tons of its mid frames, other parts such as magnetic pole and shimming plate only have 5 tons of left and right, visible, and most of weight of magnet all concentrates in frame.For this reason, when lifting magnet, generally need to use more than 25 tonnes crane, and translational speed is very slow, otherwise there will be danger.
For ease of transportation, need to reduce as far as possible the weight of frame, in the situation that frame shape is definite, conventionally adopt the mode that reduces frame thickness to reduce frame weight.
But the thickness of frame has considerable influence to central field is strong with 5 gaussian lines.Use thicker frame can strengthen to a certain extent center field intensity, be particularly advantageous in the value that reduces 5 gaussian lines, avoid the magnetic line of force to external expansion.
Because magnet is conventionally accompanied by the reduction of aging and field intensity in the process of manufacturing, therefore the field intensity adopting in the time of design all can exceed 5% left and right than the index requiring, therefore after frame thickness reduces, to field intensity reduce effect a little less than, substantially can not affect reaching of field intensity index; But after frame thickness reduces, the magnetic line of force can be to external expansion, the value of 5 gaussian lines can increase, and has affected largely shield effectiveness.
In addition, no matter be the load-bearing demand of considering magnet, or the shielding of the magnetic line of force, all need the placement place of magnetic resonance system strictly to design, cause place cost higher.
Therefore, how designing a kind of permanent magnet and frame thereof, can in alleviating frame weight, guarantee that the magnetic line of force is effectively shunk, is the current technical issues that need to address of those skilled in the art.
Summary of the invention
The object of this invention is to provide a kind of frame of permanent magnet, can in alleviating frame weight, guarantee that the magnetic line of force is effectively shunk.
Another object of the present invention is to provide a kind of permanent magnet, and its frame is lighter, and transportation cost and place construction cost are all lower.
For solving the problems of the technologies described above, the invention provides a kind of frame of permanent magnet, comprise internal frame and the shell that covers described internal frame outside, described internal frame and shell all adopt permeability magnetic material to make, and there is space between the two, in described space, be filled with not magnetic conductive media, the density of described not magnetic conductive media is less than the density of described permeability magnetic material.
Frame of the present invention comprises internal frame and shell, and has space between the two, to fill not magnetic conductive media in space, thereby effectively stops the magnetic line of force to external expansion, plays the effect of shrinking 5 gaussian lines; , make because shell adopts permeability magnetic material meanwhile, even if the small part magnetic line of force, to external expansion, also can form magnetic conduction magnetic circuit by the guiding of shell, and then around central magnetic field, play and strengthen field intensity, the abducent effect of the reduction magnetic line of force.
By above-mentioned setting, the density of magnetic conductive media is not significantly less than permeability magnetic material, in space, fills not after magnetic conductive media, and the in the situation that of given volume, the overall weight of frame is alleviated, thus convenient transportation; On the other hand, the magnetic line of force has also obtained effective contraction, has guaranteed shield effectiveness.
Preferably, described shell is arranged to reticulate texture.
Cancellated shell not only can further reduce its weight, can also improve by the density degree of grid is set the contractive effect of 5 gaussian lines.
Preferably, described cancellated mesh is set to square or circular.
When mesh is set to when square or circular, it is simple in structure, and in the situation that girth is certain, its area is relatively little, therefore it is better to shrink the effect of 5 gaussian lines.
Preferably, described shell comprises some housings of stack successively, and every layer of described housing is all set to reticulate texture, and the mesh of each layer of housing is not overlapping.
In the time that shell is set to some layers of housing, because the mesh between each layer of housing is not overlapping, housing forms fine and close reticulate texture after superposeing successively, in reducing shell weight, has strengthened shield effectiveness.
Preferably, described internal frame is C type, and with its bottom supporting on the ground, described shell covers side and the end face of described internal frame.
Because the bottom surface of internal frame is connected with ground, there will not be the abducent situation of the magnetic line of force, thus only need, at the side of internal frame and end face covering shell, further reduce the volume of shell, thus the weight of frame reduced.
Preferably, the volume in described space accounts for 10%～30% of frame.
The volume in space can be arranged between 10%～30%, not only effectively reduce the weight of frame, can also take into account preferably the intensity of frame, play the effect of supporting whole magnet framework; In addition, now also better to the contractive effect of 5 gaussian lines.
The not magnetic conductive media of preferably, filling in described space is air or PVC or epoxy resin.
Magnetic conductive media can not be the materials such as air, its cost, and can not impact the use of magnet, can also prevent preferably that the magnetic line of force is to external expansion.
Preferably, the permeability magnetic material that described internal frame and shell adopt is pure iron or cast iron, can take into account the requirement of intensity and high magnetic permeability.
The present invention also provides a kind of permanent magnet, comprises the frame for supporting magnetic pole, and described frame is the frame of the permanent magnet as described in above-mentioned any one.
Because permanent magnet of the present invention has the frame of the permanent magnet described in above-mentioned any one, therefore the technique effect that the frame of the permanent magnet described in above-mentioned any one produces is all applicable to permanent magnet of the present invention, repeat no more herein.
Preferably, described permanent magnet is two column C type permanent magnets, and described internal frame is C type, and described permanent magnet comprises two magnetic poles inside inside top surface and the bottom surface that is separately positioned on described internal frame, and described in two, magnetic pole is oppositely arranged.
Accompanying drawing explanation
Fig. 1 is the perspective view of permanent magnet provided by the present invention in a kind of embodiment;
Fig. 2 is the Facad structure schematic diagram of permanent magnet shown in Fig. 1.
In Fig. 1-2:
1 frame, 11 internal frames, 12 shells, 13 spaces, 2 magnetic poles, 3 shimming plates
Embodiment
Core of the present invention is to provide a kind of frame of permanent magnet, can in alleviating frame weight, guarantee that the magnetic line of force is effectively shunk.
Another core of the present invention is to provide a kind of permanent magnet, and its frame is lighter, and transportation cost and place construction cost are all lower.
In order to make those skilled in the art person understand better the present invention program, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 1, Fig. 1 is the perspective view of permanent magnet provided by the present invention in a kind of embodiment.
In a kind of embodiment, permanent magnet of the present invention comprises frame 1 and magnetic pole 2, and wherein, frame 1 plays the effect of supporting whole magnet framework, and magnetic pole 2 is arranged in frame 1.Magnetic pole 2 can select neodymium iron boron to make, and frame 1 can select the material of the high magnetic permeability such as cast iron or pure iron to make.
At length, permanent magnet can be set to two column C type permanent magnets, and frame 1 can be set to C type, permanent magnet can comprise that two magnetic poles, 2, two magnetic poles 2 are all arranged on the inner face of frame 1, and is oppositely arranged at above-below direction, be arranged on inside top surface and the inner side, bottom surface of frame 1, as shown in Figure 1.
Meanwhile, on magnetic pole 2, shimming plate 3 can also be set, shimming plate 3 adopts pure iron to make conventionally, and with the surface of level and smooth magnetic pole 2, uniform treatment is carried out in the magnetic field that magnetic pole 2 is produced; Shimming plate 3 is arranged on the inner face of magnetic pole 2, and permanent magnet also comprises two shimming plates 3, and two shimming plates 3 are also oppositely arranged.
It should be noted that, described inside and outside, the upper inferior noun of locality, take frame 1 as reference, when frame 1 is placed on the ground, under the direction on ground is, correspondingly, is upper away from the direction on ground herein; Take the center line of frame 1 as reference, near the direction of its center line be in, away from the direction of its center line be outside.
Incorporated by reference to Fig. 2, Fig. 2 is the Facad structure schematic diagram of permanent magnet shown in Fig. 1.
Frame 1 of the present invention can comprise internal frame 11 and shell 12, shell 12 covers the outside of internal frame 11, and the inner face of internal frame 11 is used for installing magnetic pole 2, and internal frame 11 and shell 12 all adopt the permeability magnetic material with some strength to make, to form magnetic conduction magnetic circuit, reduce leakage field; Between internal frame 11 and shell 12, there is certain thickness space 13, in space 13, be filled with not magnetic conductive media, and the density of magnetic conductive media is not less than the density of the permeability magnetic material for making internal frame 11 and shell 12.
Visible, frame 1 is set to internal frame 11 and shell 12 two parts, and between arranges certain thickness space 13, because the not magnetic conductive media density of filling in space 13 is less, in the case of the given volume of frame 1, the existence in space 13 makes the weight saving of frame 1, and then has improved the convenient transport of frame 1.
In addition, in space 13, fill not magnetic conductive media, can effectively prevent that the magnetic line of force is to external expansion, and then shunk 5 gaussian lines, be limited in the interior zone that internal frame 11 surrounds; Because the outside of internal frame 11 is coated with shell 12, even if exist the magnetic line of force of fraction to external expansion, also can be imported inside by shell 12, effectively prevent that the magnetic line of force is to external expansion, improve shield effectiveness.
Wherein, internal frame 11 and shell 12 all adopt the permeability magnetic material with some strength to make and refer to, internal frame 11 and shell 12 must meet the support demand to whole magnet framework, for this reason, it must have enough intensity, can not adopt the material that intensity is lower to make, certainly, some strength not refers to that its intensity can only be limited to certain particular value herein, but can meet the strength range of magnet frame supports demand;
In like manner, space 13 has certain thickness and refers to, the thickness in space 13 is not to arrange arbitrarily, and in the case of the given volume of frame 1, the thickness in space 13 is excessive, easily causes the strength decreased of frame 1, possibly cannot meet the support demand to magnet framework; The thickness in space 13 is less, and the DeGrain that it reduces weight, cannot solve the problem of transportation.That is to say, the thickness in space 13 need to arrange after considering, and keeps within the specific limits.
The thickness in space 13 and the not magnetic conductive media of wherein filling are determined by the factor such as size, the condition of magnet place shielding space of magnet performance index, magnet outer cover size, 5 gaussian lines, and need to pass through strict calculating and design.Visible, because the setting in space 13 has reduced the weight of frame 1, and the not magnetic conductive media intensity of filling in space 13 is lower, for guaranteeing that frame 1 has certain intensity, meets the strength demand in use procedure, and the shared volume in space 13 can be set; Comparatively preferably, volume that can space 13 is set to 10%～30% of frame 1 overall volume, not only can effectively reduce the weight of frame 1, has also taken into account its working strength.
In addition, internal frame 11 is various with the connected mode of shell 12, conventionally adopts web member made of iron to realize both connections, for example, adopts by screw the machined piece of closing; Above-mentioned web member can process with shell 12 one, also machine-shaping separately.
On the basis of the above, shell 12 can be set to reticulate texture, and compared with entity structure, cancellated shell 12 can further reduce weight; Those skilled in the art should expect, can change the contractility of shell 12 to the magnetic line of force, the effect of shrinking 5 gaussian lines to strengthen it by cancellated density degree is set.
Cancellated mesh can be set to square or circular, and due in the situation that girth is certain, its area of square or circular mesh is less, therefore cancellated compactness extent is higher, can shrink better 5 gaussian lines.
In addition, described shell 12 can also be set to sandwich construction, and shell 12 can comprise some housings of stack successively, and some housings are stack successively in direction from inside to outside; Every layer of described housing is all set to reticulate texture, and the mesh of each layer of housing is not overlapping, to increase the compactness extent of whole shell 12; In the case of the weight of shell 12 is certain, is set to multilayer reticulate texture and can effectively improves shield effectiveness.
Obviously,, in the time that shell 12 is set to some layers of housing, the mesh on every layer of housing also can be set to square or circular.
The mesh area that is appreciated that shell 12 is less, and cancellated compactness extent is higher, the reticulate texture that is square mesh that its effect of shrinking 5 gaussian lines is better, demonstrated in Figure 1.
Certainly, cancellated mesh can also be set to other arbitrary shapes, or shell 12 can also be set to entity structure, but the relative reticulate texture of its weight will weigh, when adopting when cancellated setting, can take into account better alleviating and the contraction of 5 gaussian lines of weight.
Under normal circumstances, shell 12 blocks the outside of internal frame 11 completely, effectively to prevent that the magnetic line of force from extending out.In the concrete set-up mode of one, internal frame 11 can also be set to C type, then with its bottom supporting on the ground, due to stopping of ground, there will not be the abducent situation of the magnetic line of force, therefore can only at side and the end face of internal frame 11, shell 12 be set, as depicted in figs. 1 and 2, shell 12 covers the side of internal frame 11 and the outside of end face.
The not magnetic conductive media of filling in space 13 in addition, can be the materials such as air or PVC or epoxy resin.Choosing of above-mentioned material is comparatively easy, and cost is lower, and magnetic conduction effect is not better; Especially in the time selecting air as magnetic conductive media not, not only technique is simple, also can be to environment, and more energy-conserving and environment-protective.
Particularly, the requirement to whole frame strength when which kind of medium of the interior filling in space 13 depends on design and use largely; In the situation that not affecting frame strength, space 13 is interior can fill air, if air can not meet requirement of strength, space 13 is interior can be by the filling such as PVC or epoxy resin.
Internal frame 11 and shell 12 can adopt same material to make, and also can adopt two kinds of different permeability magnetic materials.Under normal circumstances, both all need to select the material of high permeability, such as pure iron, cast iron etc.; Certainly, also need to there is certain intensity, and economical and practical.
Can expect, above-mentioned frame 1 is not only applicable to two column C type permanent magnets, is also applicable to the permanent magnet of other types, and particular type, referring to prior art, repeats no more herein.
In the time adopting the frame 1 of said structure, magnetic pole 2 and shimming plate 3 are all arranged on internal frame 11, and inner face in internal frame 11, and as depicted in figs. 1 and 2, the inside top surface of internal frame 11 is connected with magnetic pole 2, and the inner face of magnetic pole 2 is connected with again shimming plate 3; Correspondingly, be connected with from outside to inside magnetic pole 2 and shimming plate 3 in turn in the inner side, bottom surface of internal frame 11.
Obviously,, in the time that permanent magnet is set to other versions, can carry out the setting of magnetic pole 2, shimming plate 3 and internal frame 11 by analogy said structure.
Above permanent magnet provided by the present invention and frame thereof are described in detail.Applied specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment is just for helping to understand core concept of the present invention.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (10)
1. the frame of a permanent magnet, it is characterized in that, comprise internal frame (11) and cover the outside shell (12) of described internal frame (11), described internal frame (11) and shell (12) all adopt permeability magnetic material to make, and there is space (13) between the two, described space is filled with not magnetic conductive media in (13), and the density of described not magnetic conductive media is less than the density of described permeability magnetic material.
2. the frame of permanent magnet as claimed in claim 1, is characterized in that, described shell (12) is arranged to reticulate texture.
3. the frame of permanent magnet as claimed in claim 2, is characterized in that, described cancellated mesh is set to square or circular.
4. the frame of permanent magnet as claimed in claim 1, is characterized in that, described shell (12) comprises some housings of stack successively, and every layer of described housing is all set to reticulate texture, and the mesh of each layer of housing is not overlapping.
5. the frame of permanent magnet as described in claim 1-4 any one, is characterized in that, described internal frame (11) is C type, and with its bottom supporting on the ground, described shell (12) covers side and the end face of described internal frame (11).
6. the frame of permanent magnet as claimed in claim 5, is characterized in that, the volume of described space (13) accounts for 10%～30% of frame (1).
7. the frame of permanent magnet as claimed in claim 6, is characterized in that, the not magnetic conductive media of filling in described space (13) is air or PVC or epoxy resin.
8. the frame of permanent magnet as claimed in claim 7, is characterized in that, the permeability magnetic material that described internal frame (11) and shell (12) adopt is pure iron or cast iron.
9. a permanent magnet, comprises the frame (1) for supporting magnetic pole (2), it is characterized in that, described frame (1) is the frame (1) of the permanent magnet as described in the claims 1-8 any one.
10. permanent magnet as claimed in claim 9, it is characterized in that, described permanent magnet is two column C type permanent magnets, described internal frame (11) is C type, described permanent magnet comprises two magnetic poles (2) inside inside top surface and the bottom surface that is separately positioned on described internal frame (11), and magnetic pole described in two (2) is oppositely arranged.
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| CN201310638180.1A CN103901372B (en) | 2013-11-29 | 2013-11-29 | A kind of permanent magnet and frame thereof |
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| CN201310638180.1A CN103901372B (en) | 2013-11-29 | 2013-11-29 | A kind of permanent magnet and frame thereof |
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| CN103901372A true CN103901372A (en) | 2014-07-02 |
| CN103901372B CN103901372B (en) | 2016-10-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983537A (en) * | 2020-08-19 | 2020-11-24 | 深圳航天科技创新研究院 | Magnetic resonance magnet structure with separated magnetic conduction and bearing functions |
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| CN111983537A (en) * | 2020-08-19 | 2020-11-24 | 深圳航天科技创新研究院 | Magnetic resonance magnet structure with separated magnetic conduction and bearing functions |
| CN111983537B (en) * | 2020-08-19 | 2023-06-06 | 深圳航天科技创新研究院 | Magnetic resonance magnet structure with separated magnetic conduction and bearing functions |
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| CN103901372B (en) | 2016-10-05 |
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