CN104376958A - Permanent magnet device - Google Patents
Permanent magnet device Download PDFInfo
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- CN104376958A CN104376958A CN201410673760.9A CN201410673760A CN104376958A CN 104376958 A CN104376958 A CN 104376958A CN 201410673760 A CN201410673760 A CN 201410673760A CN 104376958 A CN104376958 A CN 104376958A
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- permanent magnet
- hollow space
- magnetic field
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- magnet device
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Abstract
The invention discloses a permanent magnet device. The permanent magnet device comprises a first permanent magnet, a second permanent magnet and an adjusting component, wherein the first permanent magnet is provided with a cylindrical hollow part, the second permanent magnet is arranged in the cylindrical hollow part, and the adjusting component is connected with the second permanent magnet and used for adjusting the position of the second permanent magnet in the hollow part; the adjusting direction is parallel to the magnetization direction of the first permanent magnet and the second permanent magnet. By the adoption of the permanent magnet device, a depth-adjustable static magnetic field region with a fixed gradient can be generated, so that samples at different depths can be detected.
Description
Technical field
The present invention relates to nuclear magnetic resonance technique field, particularly relate to a kind of permanent magnet device.
Background technology
Nulcear magnetic resonance (NMR), as a kind of non-invasive measuring technique, has been widely applied to the fields such as food quality analysis, geophysics, biomedicine, material science, closely bound up with the life of people.
When carrying out magnetic resonance detection to sample, need a horizontal direction evenly and vertical direction has the static magnetic field zone of action of fixing gradient.Wherein, producing one of the core component in fixing gradient static magnetic field region is permanent magnet device, and traditional permanent magnet device can only produce fixing gradient static magnetic field region in the region of certain depth, and therefore the degree of depth of magnetic resonance detection can only be a fixed value.The degree of depth just because of the fixing gradient static magnetic field region of permanent magnet device generation can not change, and brings inconvenience therefore to the magnetic resonance detection of sample.
Therefore, how making permanent magnet device produce the fixing gradient static magnetic field region of depth adjustable joint, thus carry out magnetic resonance detection to sample different depth place, is a problem demanding prompt solution.
Summary of the invention
For solving the problem, the invention provides a kind of permanent magnet device, the fixing gradient static magnetic field region of depth adjustable joint can be produced, thus the magnetic resonance detection at sample different depth place can be carried out.
For achieving the above object, the invention provides following technical scheme:
A kind of permanent magnet device, comprising:
There is the first permanent magnet of tubular hollow space;
Be arranged at the second permanent magnet of described tubular hollow space;
The adjustment member be connected with described second permanent magnet, for regulating the described position of the second permanent magnet in described hollow space, wherein, the direction of adjustment is parallel with the direction of magnetization of described first permanent magnet and described second permanent magnet.
Preferably, in above-mentioned permanent magnet device, described tubular hollow space is cylindric, and described second permanent magnet is cylindric.
Preferably, in above-mentioned permanent magnet device, the internal diameter of described first permanent magnet is identical with the diameter of described second permanent magnet.
Preferably, in above-mentioned permanent magnet device, comprising:
Top board, described top board is used for the upper surface of the tubular hollow space of the first permanent magnet described in shutoff;
Base plate, described base plate is used for the lower surface of the tubular hollow space of the first permanent magnet described in shutoff;
Described top board and the utilization of described base plate run through described top board and are connected with the set bolt of described base plate.
Preferably, in above-mentioned permanent magnet device, described adjustment member comprises:
Be arranged on the screw at described base plate center;
The adjusting bolt matched with described screw;
Described adjusting bolt drives described second permanent magnet motion through described screw.
Preferably, in above-mentioned permanent magnet device, described adjustment member utilizes seccotine bonding with described second permanent magnet.
Preferably, in above-mentioned permanent magnet device, the material of described adjustment member is stainless steel.
Preferably, in above-mentioned permanent magnet device, the peripheral part of described first permanent magnet is cylindric.
By foregoing description, permanent magnet device provided by the invention comprises: first permanent magnet with tubular hollow space; Be arranged at the second permanent magnet of described tubular hollow space; The adjustment member be connected with described second permanent magnet, for regulating the described position of the second permanent magnet in described hollow space, wherein, the direction of adjustment is parallel with the direction of magnetization of described first permanent magnet and described second permanent magnet.This permanent magnet device overcomes the uncontrollable shortcoming of the degree of depth in the fixing gradient static magnetic field region that permanent magnet device of the prior art produces, and has obvious beneficial effect.In the present invention, described adjustment member can regulate the position of described second permanent magnet in the first permanent magnet hollow space, wherein, the direction of described adjustment is identical with the direction of magnetization of described second permanent magnet, thus the distribution situation in the magnetic field that described first permanent magnet and described second permanent magnet produce jointly can be changed, thus change the distance of the fixing position in gradient static magnetic field region and the upper surface of described first permanent magnet, namely change the degree of depth in fixing gradient static magnetic field region, the magnetic resonance detection at the different depth place of sample can be realized.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
The schematic diagram in the first permanent magnet device cross section that Fig. 1 provides for the embodiment of the present application;
The schematic diagram in the second permanent magnet device cross section that Fig. 2 provides for the embodiment of the present application;
The second permanent magnet device that Fig. 3 provides for the application is at the second permanent magnet upper surface and the first permanent magnet upper surface distance position view in fixing gradient static magnetic field region for producing during 0mm;
The second permanent magnet device that Fig. 4 provides for the application is at the second permanent magnet upper surface and the first permanent magnet upper surface distance position view in fixing gradient static magnetic field region for producing during 0.2mm;
The second permanent magnet device that Fig. 5 provides for the application is at the second permanent magnet upper surface and the first permanent magnet upper surface distance position view in fixing gradient static magnetic field region for producing during 0.4mm.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The first permanent magnet device that the embodiment of the present application provides as shown in Figure 1, the schematic diagram in the first permanent magnet device cross section that Fig. 1 provides for the embodiment of the present application.This permanent magnet device comprises: first permanent magnet 101 with tubular hollow space; Be arranged at the second permanent magnet 102 of described tubular hollow space; The adjustment member 103 be connected with described second permanent magnet 102, for regulating described second position of permanent magnet 102 in described hollow space, wherein, the direction of adjustment is parallel with the direction of magnetization of described first permanent magnet 101 and described second permanent magnet 102.
Described adjustment member 103 can produce motion under external force, drives the motion of described second permanent magnet 102, thus regulates the described position of the second permanent magnet 102 in the first permanent magnet hollow space.Wherein, above-mentioned adjustment direction is identical with the direction of magnetization of described first permanent magnet 101 and described second permanent magnet 102, thus the distribution situation in the superposition magnetic field of described first permanent magnet 101 and described second permanent magnet 102 generation can be changed, thus change the distance of the upper surface of fixing gradient static magnetic field region and described first permanent magnet 101, namely change the fixing degree of depth residing for gradient static magnetic field region, thus realize the magnetic resonance detection to sample different depth place.
The embodiment of the present application additionally provides the second permanent magnet device as shown in Figure 2, the schematic diagram in the second permanent magnet device cross section that Fig. 2 provides for the embodiment of the present application.
In the second permanent magnet device, the peripheral part of described first permanent magnet 201 is preferably cylindric, thus the spatial distribution in the magnetic field produced at an upper portion thereof is more even, better ensure the fixing gradient of its fixing gradient static magnetic field region all even vertical direction in the horizontal direction produced.
The tubular hollow space of described first permanent magnet 201 can be preferably cylindric, and described second permanent magnet 202 is also preferably cylindric, thus the spatial distribution in magnetic field that described second permanent magnet 202 produces at an upper portion thereof is more even, better ensure the fixing gradient of its fixing gradient static magnetic field region all even vertical direction in the horizontal direction produced.Described tubular hollow space is identical with the shape of described second permanent magnet 202, can ensure that described second permanent magnet 202 is not hindered in the motion of described tubular hollow space.The internal diameter of described first permanent magnet 201 is preferred identical with the diameter of described second permanent magnet 202 further, such energy ensures that described second permanent magnet 202 can be accomplished to fit closely with the inwall of described first permanent magnet 201, thus avoid described second permanent magnet 202 generation cross stream component when moving, thus the accuracy of flux control can better be ensured.
In above-mentioned permanent magnet device, also preferably comprise: top board 205 and base plate 206, described top board 205 and the utilization of described base plate 206 run through described top board 205 and are connected with 208 with the set bolt 207 of described base plate 206.Described top board 205 is for the upper surface of the tubular hollow space of the first permanent magnet 201 described in shutoff, so just can limit the maximum height that described second permanent magnet 202 moves, avoid the second permanent magnet 202 position in the course of the work to exceed the upper surface of described first permanent magnet 201; Described base plate 206 is for the lower surface of the tubular hollow space of the first permanent magnet 201 described in shutoff, so just can limit the minimum constructive height that described second permanent magnet 202 moves, avoid the second permanent magnet 202 position in the course of the work to exceed the lower surface of described first permanent magnet 201.Set bolt 207 is utilized to be connected with described base plate 206 by described top board 205 with 208, nut is utilized to be tightened in the top of described set bolt 207 and 208 and bottom, make described top board 205 and described base plate 206 and described first permanent magnet 201 fluid-tight engagement, thus described permanent magnet device is fixed in detecting instrument, prevent described second permanent magnet 202 from coming off out from tubular hollow space.It should be noted that, the quantity of described set bolt can also be preferably four or more, better to ensure the firmness fixed.
In above-mentioned permanent magnet device, preferably comprise: the screw 204 being arranged on the centre of described base plate 206, and the adjusting bolt 203 to match with described screw 204, described screw 204 and described adjusting bolt 203 are the adjustment member of the second permanent magnet device.Described adjusting bolt 203 fastens just with the screw thread of described screw 204, by rotating described adjusting bolt 203, makes it be upward through described screw 204 from the bottom of described screw 204, then is connected with described second permanent magnet 202.Rotate described adjusting bolt 203 by external force, just can realize described adjusting bolt 203 and move upward in the side parallel with second permanent magnet 202 direction of magnetization, thus drive connected described second permanent magnet 202 being parallel to the motion of its direction of magnetization.It should be noted that herein, the direction of magnetization of described first permanent magnet 201 and described second permanent magnet 202 is preferably set to the axis direction along described first permanent magnet 201 and described second permanent magnet 202 by the present embodiment, namely vertically, further, first permanent magnet 201 described in the present embodiment and described second permanent magnet 202 are N pole on top, and S pole is in bottom.Motion due to described adjusting bolt 203 is the motion of vertical direction, described second permanent magnet 202 is driven to carry out the motion of vertical direction, therefore the difference in height of the upper surface of described first permanent magnet 201 and the upper surface of described second permanent magnet 202 can just be changed, thus change the distribution situation in the superposition magnetic field of described first permanent magnet 201 and described second permanent magnet 202 generation, change the distance on fixing vertical direction between gradient static magnetic field region and the upper surface of described first permanent magnet 201, that is the degree of depth residing for described fixing gradient static magnetic field region is changed, the different depth place of instrument to sample that make use of permanent magnet device of the present invention can be made to carry out magnetic resonance detection.
In above-mentioned permanent magnet device, described adjusting bolt 203 preferably utilizes seccotine bonding with described second permanent magnet 202.More specifically, by smooth for the surface finish that will contact with described second permanent magnet 202 of described adjusting bolt 203, again at this surface smear seccotine, adjusting bolt 203 to be contacted and bonding with described second permanent magnet by this surface, thus described adjusting bolt 203 is combined closely with described second permanent magnet 202, form unified entirety, entirety can be realized and move together.This method utilizing bonding to realize the connection of described adjusting bolt 203 and described second permanent magnet 202, can avoid carrying out the operations such as punching to the second permanent magnet 202 of fragility material, thus avoid described second permanent magnet 202 to crack, affect the normal work of permanent magnet device.It should be noted that, also can adopt other connected mode herein, as long as do not damage described second permanent magnet.
In above-mentioned permanent magnet device, the material of described adjusting bolt 203 is preferably stainless steel.Stainless steel, as a kind of nonferromugnetic material, can not disturb the magnetic field that described first permanent magnet 201 and described second permanent magnet 202 produce.Certainly, described top board 205, described base plate 206 and described set bolt 207 and 208 also can be preferably stainless steel, the all parts realizing whole permanent magnet device all can not produce interference to magnetic field, thus ensures the accuracy of flux control, and the stability of permanent magnet device work.It should be noted that, the material of adjusting bolt 203 herein also can select the nonferromugnetic material outside stainless steel, disturbs as long as ensure to have enough intensity and can not produce magnetic field.
Utilize the second permanent magnet device as above, the degree of depth residing for described fixing gradient static magnetic field region can be changed, magnetic resonance detection can be carried out to the different depth place of sample.
Below in conjunction with Fig. 3, Fig. 4 and Fig. 5, the course of work of the second permanent magnet device described in the application is described.The second permanent magnet device that Fig. 3 provides for the application is at the second permanent magnet upper surface and the first permanent magnet upper surface distance position view in fixing gradient static magnetic field region for producing during 0mm; The second permanent magnet device that Fig. 4 provides for the application is at the second permanent magnet upper surface and the first permanent magnet upper surface distance position view in fixing gradient static magnetic field region for producing during 0.2mm; The second permanent magnet device that Fig. 5 provides for the application is at the second permanent magnet upper surface and the first permanent magnet upper surface distance position view in fixing gradient static magnetic field region for producing during 0.4mm.
In the case shown in figure 3, the upper surface of the second permanent magnet 202 is close to top board 205, namely the difference in height of the upper surface of described second permanent magnet 202 and the upper surface of the first permanent magnet 201 is 0mm, utilize analogy method draw meet be evenly distributed in the horizontal direction, the vertically field region of the condition of distribution gradient, namely the distance H between the bottom in gradient static magnetic field region and described top board 205 is fixed in the fixing gradient static magnetic field region 301, described first of first in figure
1for 1.5mm.When as shown in Figure 4, relative to Fig. 3, described second permanent magnet 202 is under the drive of adjusting device, move down certain distance, now, the difference in height of the upper surface of described second permanent magnet 202 and the upper surface of described first permanent magnet 201 is 0.2mm, utilizes analogy method to draw, the distance H between the bottom in the in this case produce second fixing gradient static magnetic field region 401 and described top board 205
2for 2.1mm; When as shown in Figure 5, the difference in height of the upper surface of described second permanent magnet 202 and the upper surface of described first permanent magnet 201 is 0.4mm, analogy method is utilized to draw, the distance H between the bottom in the in this case produce the 3rd fixing gradient static magnetic field region 501 and described top board 205
3for 2.8mm.It should be noted that, produce in above-mentioned three kinds of situations first fixing gradient static magnetic field region 401, fixing gradient static magnetic field region 301, second is not identical with the magnetic field distribution in the 3rd fixing gradient static magnetic field region 501, but the difference of this magnetic field intensity can't have an impact to technical scheme of the present invention, does not repeat them here.Need herein it is once more emphasized that, the selection principle in described fixing gradient static magnetic field region is: be evenly distributed in the horizontal direction, vertically in fixing gradient distribution.From foregoing description, after there is relative motion with described first permanent magnet 201 in described second permanent magnet 202, the position in the fixing gradient static magnetic field region that permanent magnet device produces changes thereupon, thus the instrument being provided with the permanent magnet device described in the application just can realize the magnetic resonance detection at the different depth place of sample.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. a permanent magnet device, is characterized in that, comprising:
There is the first permanent magnet of tubular hollow space;
Be arranged at the second permanent magnet of described tubular hollow space;
The adjustment member be connected with described second permanent magnet, for regulating the described position of the second permanent magnet in described hollow space, wherein, the direction of adjustment is parallel with the direction of magnetization of described first permanent magnet and the second permanent magnet.
2. device according to claim 1, is characterized in that, described tubular hollow space is cylindric, and described second permanent magnet is cylindric.
3. device according to claim 2, is characterized in that, the internal diameter of described first permanent magnet is identical with the diameter of described second permanent magnet.
4. the device according to any one of claim 1-3, is characterized in that, comprising:
Top board, described top board is used for the upper surface of the tubular hollow space of the first permanent magnet described in shutoff;
Base plate, described base plate is used for the lower surface of the tubular hollow space of the first permanent magnet described in shutoff;
Described top board and the utilization of described base plate run through described top board and are connected with the set bolt of described base plate.
5. device according to claim 4, is characterized in that, described adjustment member comprises:
Be arranged on the screw at described base plate center;
The adjusting bolt matched with described screw;
Described adjusting bolt drives described second permanent magnet motion through described screw.
6. device according to claim 1, is characterized in that, described adjustment member utilizes seccotine bonding with described second permanent magnet.
7. device according to claim 1, is characterized in that, the material of described adjustment member is stainless steel.
8. device according to claim 1, is characterized in that, the peripheral part of described first permanent magnet is cylindric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410673760.9A CN104376958A (en) | 2014-11-21 | 2014-11-21 | Permanent magnet device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410673760.9A CN104376958A (en) | 2014-11-21 | 2014-11-21 | Permanent magnet device |
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| Publication Number | Publication Date |
|---|---|
| CN104376958A true CN104376958A (en) | 2015-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410673760.9A Pending CN104376958A (en) | 2014-11-21 | 2014-11-21 | Permanent magnet device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112802653A (en) * | 2021-04-06 | 2021-05-14 | 宁波兴隆磁性技术有限公司 | Magnetizing and demagnetizing method, magnetizing and demagnetizing magnetic head and magnetizing and demagnetizing machine |
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| JPH05243037A (en) * | 1992-03-02 | 1993-09-21 | Seiko Epson Corp | Magnetic field producing device |
| CN1877757A (en) * | 2005-06-10 | 2006-12-13 | 北京泰杰燕园医学工程技术有限公司 | Permanent magnet, magnet device for MRI comprising the permanent magnet, and method for fabricating same |
| CN101388271A (en) * | 2007-09-14 | 2009-03-18 | Ge医疗系统环球技术有限公司 | Magnetic body system and MRI equipment |
| CN104091680A (en) * | 2014-07-11 | 2014-10-08 | 沈阳工业大学 | Probing-depth-adjustable NMR well-logging probe permanent magnet |
| CN204270770U (en) * | 2014-11-21 | 2015-04-15 | 国网重庆市电力公司电力科学研究院 | A kind of permanent magnet device |
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2014
- 2014-11-21 CN CN201410673760.9A patent/CN104376958A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05243037A (en) * | 1992-03-02 | 1993-09-21 | Seiko Epson Corp | Magnetic field producing device |
| CN1877757A (en) * | 2005-06-10 | 2006-12-13 | 北京泰杰燕园医学工程技术有限公司 | Permanent magnet, magnet device for MRI comprising the permanent magnet, and method for fabricating same |
| CN101388271A (en) * | 2007-09-14 | 2009-03-18 | Ge医疗系统环球技术有限公司 | Magnetic body system and MRI equipment |
| CN104091680A (en) * | 2014-07-11 | 2014-10-08 | 沈阳工业大学 | Probing-depth-adjustable NMR well-logging probe permanent magnet |
| CN204270770U (en) * | 2014-11-21 | 2015-04-15 | 国网重庆市电力公司电力科学研究院 | A kind of permanent magnet device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112802653A (en) * | 2021-04-06 | 2021-05-14 | 宁波兴隆磁性技术有限公司 | Magnetizing and demagnetizing method, magnetizing and demagnetizing magnetic head and magnetizing and demagnetizing machine |
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