CN217214327U - Self-shielding compact high-strength magnet - Google Patents
Self-shielding compact high-strength magnet Download PDFInfo
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- CN217214327U CN217214327U CN202220255015.2U CN202220255015U CN217214327U CN 217214327 U CN217214327 U CN 217214327U CN 202220255015 U CN202220255015 U CN 202220255015U CN 217214327 U CN217214327 U CN 217214327U
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Abstract
The utility model provides a self-shielding compact high-strength magnet, which relates to the technical field of nuclear magnetic resonance and comprises a Halbach magnet with an annular columnar structure; the outer ring of the Halbach magnet is provided with a shielding shell; two magnetic conduction plates are symmetrically arranged in a central hole of the Halbach magnet, and two limiting blocks are symmetrically arranged between the magnetic conduction plates; the two magnetic conduction plates and the two limiting blocks are combined to form a working air gap. The self-shielding compact high-strength magnet of the utility model has small volume; the magnetic field intensity is high; the magnetic field uniform field range is large; the magnetic shielding device can effectively shield the magnetic field, prevent magnetic field divergence and magnetic leakage and has large effective working gap; can reach the magnetic field intensity of more than 1T.
Description
Technical Field
The utility model relates to a nuclear magnetic resonance technology field especially relates to a self-shielding compact high strength magnet.
Background
A nuclear magnetic resonance spectrometer (NMR spectroscopy) is a tool used for quantitative analysis of substances, molecular structure and molecular dynamics research, and is widely applied to many fields such as analytical chemistry, structural biology, food and plant science, pharmacy or forensic medicine. The permanent magnet used in nuclear magnetic resonance equipment traditionally adopts a permanent magnet H-shaped or C-shaped structure composed of an iron yoke, a permanent magnet block, a shimming polar plate and the like. Such magnets are bulky and heavy due to the presence of the iron yoke, and have limited magnetic field strength. Compared with the traditional permanent magnet design, the novel iron-yoke-free multi-pole cylindrical Halbach magnet structure formed by rare earth materials has more advantages in structure and magnetic field strength, can realize higher magnetic field strength, is closed in magnetic flux, is small in loss field, and is small in mutual interference with the environment.
The Halbach magnet structure in the prior art still has the technical problems of poor shielding performance, small magnetic field uniformity and insufficient magnetic field strength.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a from shielding compact high strength magnet to solve above-mentioned technical problem.
In order to achieve the above object, the present invention provides a self-shielding compact high strength magnet, which includes a Halbach magnet having an annular columnar structure; the outer ring of the Halbach magnet is provided with a shielding shell; two magnetic conduction plates are symmetrically arranged in a central hole of the Halbach magnet, and two limiting blocks are symmetrically arranged between the magnetic conduction plates; the two magnetic conduction plates and the two limiting blocks are combined to form a working air gap.
Furthermore, two ends of the Halbach magnet are provided with combined magnetic steel; the combined magnetic steel is positioned in the shielding shell; the combined magnetic steel is provided with an opening corresponding to the working air gap; the Halbach magnet generates a one-way magnetic field in the working air gap; the direction of the magnetic field generated by the combined magnetic steel in the working air gap is the same as that of the magnetic field generated by the Halbach magnet in the working air gap, so that the magnetic field in the working air gap is enhanced. The two ends of the shielding shell can also be provided with end plates, and the end plates are provided with openings corresponding to the working air gaps. The shielding shell and the end plate are both made of ferromagnetic materials with a shielding effect on a magnetic field.
Furthermore, the Halbach magnet is formed by arranging and combining a plurality of permanent magnets with fan-shaped annular structures in an annular Halbach permanent magnet array.
More specifically, the Halbach magnet generates a unidirectional magnetic field in the working air gap in a direction vertically downward; the permanent magnet combination of Halbach magnets is known in the art and will not be described in detail here. The combined magnetic steel comprises upper magnetic steel and lower magnetic steel which are symmetrically arranged; a left magnetic steel and a right magnetic steel are symmetrically arranged between the upper magnetic steel and the lower magnetic steel; the magnetizing directions of the upper magnetic steel and the lower magnetic steel are opposite; the magnetizing direction of the upper magnetic steel faces to the Halbach magnet; the magnetizing directions of the left magnetic steel and the right magnetic steel are both vertical and upward.
Preferably, the number of permanent magnets constituting the sector-shaped ring structure of the Halbach magnet is 8, 10 or 12.
In addition, the side surfaces of the two magnetic conduction plates, which are close to each other, are planes which are parallel to each other; the side surfaces of the two magnetic conduction plates, which are far away from each other, are cambered surfaces tightly attached to the inner ring of the Halbach magnet.
The side surfaces of the two limit blocks, which are close to each other, are planes which are parallel to each other; the side surfaces of the two limiting blocks, which are far away from each other, are cambered surfaces tightly attached to the inner ring of the Halbach magnet; the side surfaces of the two limit blocks, which are close to the magnetic conduction plate, are planes which are tightly attached to the magnetic conduction plate.
Advantageous effects
The self-shielding compact high-strength magnet of the utility model has small volume; the magnetic field intensity is high; the magnetic field uniform field range is large; the magnetic shielding device can effectively shield the magnetic field, prevent magnetic field divergence and magnetic leakage and has large effective working gap; can reach the magnetic field intensity of more than 1T.
Drawings
Fig. 1 is an exploded view of the self-shielding compact high-strength magnet of the present invention.
Fig. 2 is a cross-sectional view of the self-shielding compact high-strength magnet of the present invention.
Fig. 3 is a sectional view taken along the direction a-a in fig. 2 according to the present invention.
Fig. 4 is the main view structure schematic diagram of the combined magnetic steel of the utility model.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer, the attached drawings of the present invention are combined to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention. Unless defined otherwise, technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. As used herein, the word "comprising" and similar words are intended to mean that the element or item preceding the word comprises the element or item listed after the word and its equivalent, but not the exclusion of other elements or items.
To the problems existing in the prior art, the embodiment of the utility model provides a self-shielding compact high-strength magnet.
Examples
As shown in fig. 1 to 4, a self-shielded compact high-strength magnet includes a Halbach magnet 2 of an annular columnar structure; the outer ring of the Halbach magnet 2 is provided with a shielding shell 1; two magnetic conduction plates 4 are symmetrically arranged in a central hole of the Halbach magnet 2, and two limiting blocks 3 are symmetrically arranged between the magnetic conduction plates 4; the two magnetic conduction plates 4 and the two limiting blocks 3 are combined to form a working air gap 7.
Two ends of the Halbach magnet 2 are provided with combined magnetic steels 5; the combined magnetic steel 5 is positioned in the shielding shell 1; the combined magnetic steel 5 is provided with an opening corresponding to the working air gap 7; the Halbach magnet 2 generates a one-way magnetic field in the working air gap 7; the direction of the magnetic field generated by the combined magnetic steel 5 in the working air gap is the same as that of the magnetic field generated by the Halbach magnet 2 in the working air gap 7, so that the magnetic field in the working air gap is enhanced. The two ends of the shielding shell 1 can also be provided with end plates 6, and the end plates 6 are provided with openings corresponding to the working air gaps 7. The shielding shell 1 and the end plate 6 are made of ferromagnetic material having a shielding effect on a magnetic field.
The Halbach magnet 2 is formed by arranging and combining a plurality of permanent magnets with fan-shaped annular structures in an annular Halbach permanent magnet array. The Halbach magnet 2 generates a unidirectional magnetic field in the working air gap 7 in a direction vertically downward; the permanent magnet combination of the Halbach magnet 2 is prior art in this field and will not be described in detail here. The combined magnetic steel 5 comprises an upper magnetic steel 5-1 and a lower magnetic steel 5-2 which are symmetrically arranged; a left magnetic steel 5-3 and a right magnetic steel 5-4 are symmetrically arranged between the upper magnetic steel 5-1 and the lower magnetic steel 5-2; the magnetizing directions of the upper magnetic steel 5-1 and the lower magnetic steel 5-2 are opposite; the magnetizing direction of the upper magnetic steel 5-1 faces to the Halbach magnet 2; the magnetizing directions of the left magnetic steel 5-3 and the right magnetic steel 5-4 are both vertical upwards.
In this embodiment, the number of the permanent magnets constituting the sector annular structure of the Halbach magnet 2 is 8, and the number of the permanent magnets may also be 10, 12, or the like.
In addition, the side surfaces of the two magnetic conduction plates 4 close to each other are planes parallel to each other; the side surfaces of the two magnetic conduction plates 4, which are far away from each other, are cambered surfaces tightly attached to the inner ring of the Halbach magnet 2.
The side surfaces of the two limiting blocks 3, which are close to each other, are planes which are parallel to each other; the side surfaces of the two limiting blocks 3, which are far away from each other, are cambered surfaces tightly attached to the inner ring of the Halbach magnet 2; the side surfaces of the two limiting blocks 3 close to the magnetic conduction plate 4 are planes tightly attached to the magnetic conduction plate 4.
The utility model discloses a from shielding compact high strength magnet has: (1) the Halbach magnet 2 can realize higher magnetic field intensity, closed magnetic flux and small escape field; (2) the shielding shell 1 can effectively shield by itself, and prevent the dispersion of internal strong magnetism from influencing the work of external instruments, namely the accidental holding of ferromagnetic substances, and causing equipment damage and personal accidents; the method can prevent external magnetic substances from influencing the uniformity of an internal magnetic field and the normal operation of nuclear magnetic resonance; (3) the magnetic conduction plate 4 is made of high magnetic conduction materials, so that the magnetic field intensity is improved in the magnetic field, and the uniformity of the magnetic field is improved; the parallelism of the magnetic conduction plates is ensured through the limiting block 3; (4) a combined magnetic steel 5; the magnetic field intensity of the two ends of the Halbach magnet 2 is enhanced by adopting the combined magnetic steel 5 at the two ends; (5) the end plate 6, the end plate 6 has shielding function; the magnetic leakage at two ends can be effectively shielded, and the magnetic field can be prevented from being diffused.
Although the embodiments of the present invention have been described in detail hereinabove, it is apparent to those skilled in the art that various modifications and variations can be made to these embodiments. However, it is to be understood that such modifications and variations fall within the scope and spirit of the invention as set forth in the following claims. Moreover, the invention as described herein is capable of other embodiments and of being practiced or of being carried out in various ways.
Claims (9)
1. A self-shielded compact high-strength magnet, comprising a Halbach magnet of annular cylindrical configuration; the outer ring of the Halbach magnet is provided with a shielding shell; two magnetic conduction plates are symmetrically arranged in a central hole of the Halbach magnet, and two limiting blocks are symmetrically arranged between the magnetic conduction plates; the two magnetic conduction plates and the two limiting blocks are combined to form a working air gap.
2. The self-shielded compact high-strength magnet according to claim 1, wherein both ends of the Halbach magnet are provided with combined magnetic steel; the combined magnetic steel is positioned in the shielding shell; the combined magnetic steel is provided with an opening corresponding to the working air gap; the Halbach magnet generates a one-way magnetic field in the working air gap; the direction of the magnetic field generated by the combined magnetic steel in the working air gap is the same as that of the magnetic field generated by the Halbach magnet in the working air gap, so that the magnetic field in the working air gap is enhanced.
3. A self-shielded compact high-strength magnet according to claim 1, wherein end plates are provided at both ends of the shield case, and the end plates are provided with openings corresponding to the working air gaps.
4. The self-shielding compact high-strength magnet according to claim 1, wherein the Halbach magnet is formed by arranging and combining a plurality of permanent magnets with fan-shaped annular structures in an annular Halbach permanent magnet array.
5. The self-shielding compact high strength magnet according to claim 2, wherein the Halbach magnet produces a unidirectional magnetic field in the working air gap directed vertically downward; the combined magnetic steel comprises upper magnetic steel and lower magnetic steel which are symmetrically arranged; a left magnetic steel and a right magnetic steel are symmetrically arranged between the upper magnetic steel and the lower magnetic steel; the magnetizing directions of the upper magnetic steel and the lower magnetic steel are opposite; the magnetizing direction of the upper magnetic steel faces to the Halbach magnet; the magnetizing directions of the left magnetic steel and the right magnetic steel are both vertical and upward.
6. A self-shielded compact high-strength magnet according to claim 3, wherein the shield case and the end plates are each made of a ferromagnetic material having a shielding effect against a magnetic field.
7. The self-shielded compact high-strength magnet according to claim 4, wherein the number of the permanent magnets constituting the sector ring structure of the Halbach magnet is 8, 10 or 12.
8. The self-shielded compact high-strength magnet according to claim 7, wherein the sides of the two magnetic conductive plates that are close to each other are planes that are parallel to each other; the side surfaces of the two magnetic conduction plates, which are far away from each other, are cambered surfaces tightly attached to the inner ring of the Halbach magnet.
9. The self-shielded compact high-strength magnet according to claim 8, wherein the sides of the two stoppers that are close to each other are planes that are parallel to each other; the side surfaces of the two limiting blocks, which are far away from each other, are cambered surfaces tightly attached to the inner ring of the Halbach magnet; the side surfaces of the two limit blocks, which are close to the magnetic conduction plate, are planes which are tightly attached to the magnetic conduction plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220255015.2U CN217214327U (en) | 2022-02-08 | 2022-02-08 | Self-shielding compact high-strength magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220255015.2U CN217214327U (en) | 2022-02-08 | 2022-02-08 | Self-shielding compact high-strength magnet |
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| Publication Number | Publication Date |
|---|---|
| CN217214327U true CN217214327U (en) | 2022-08-16 |
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| CN202220255015.2U Active CN217214327U (en) | 2022-02-08 | 2022-02-08 | Self-shielding compact high-strength magnet |
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| CN (1) | CN217214327U (en) |
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- 2022-02-08 CN CN202220255015.2U patent/CN217214327U/en active Active
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