CN205900224U - A permanent magnet device for nuclear magnetic resonance probe - Google Patents
A permanent magnet device for nuclear magnetic resonance probe Download PDFInfo
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Abstract
Description
技术领域technical field
本实用新型涉及核磁共振技术领域，尤其涉及一种用于核磁共振探头的永磁体装置。The utility model relates to the technical field of nuclear magnetic resonance, in particular to a permanent magnet device for a nuclear magnetic resonance probe.
背景技术Background technique
近年来，在核磁共振设备领域已经获得了不断的发展，提出了许多重要的应用方向，并且不断在实现。In recent years, the field of nuclear magnetic resonance equipment has achieved continuous development, and many important application directions have been proposed and realized continuously.
当前对钻探岩心样品的测量，采用的方法是先通过野外钻探获得岩心，再将岩心带回对测量环境要求较高的实验室中测量。这种方法的缺陷在于从岩心的获得到测量完成所需的时间过长，以致所得分析结果因其时效性差，不能有效地应用于指导现场勘探与开发。因此实现快速获取岩心样本的物理化学特性具有现实的意义。也由于同样的原因，农产品和食品质量检测以及化工产品的现场测量等，亦需要便携式核磁共振仪器。The current method for measuring drilled core samples is to first obtain cores through field drilling, and then bring the cores back to a laboratory that requires a higher measurement environment for measurement. The disadvantage of this method is that it takes too long from the acquisition of the core to the completion of the measurement, so that the obtained analysis results cannot be effectively used to guide on-site exploration and development due to their poor timeliness. Therefore, it is of practical significance to quickly obtain the physical and chemical properties of core samples. For the same reason, the quality inspection of agricultural products and food and the on-site measurement of chemical products also require portable nuclear magnetic resonance instruments.
静磁场发生装置(磁源)是核磁共振仪器(NMR)的重要组成部分。构建便携式NMR装置的首要问题不是磁场强度有多高，而是需要适合的磁场强度、均匀度和整个设备的尺寸、重量。便携式核磁共振仪器要求磁体能够提供适合的磁场强度和均匀度，并尽可能减少整个设备的尺寸和重量。The static magnetic field generating device (magnetic source) is an important part of the nuclear magnetic resonance instrument (NMR). The primary problem in building a portable NMR device is not how high the magnetic field strength is, but the appropriate magnetic field strength, uniformity, and the size and weight of the entire device. Portable NMR instruments require magnets that can provide suitable field strength and uniformity while minimizing the size and weight of the overall device.
在当前进行核磁共振测量时，绝大多数的试验手段都是将样品装入试管进行测量，因此便携式核磁共振仪器需要一种磁场空间利用率高、均匀度高、体积小、重量轻、漏磁少，适用于对试管中样品进行测量的永磁磁体。In the current nuclear magnetic resonance measurement, most of the test methods are to put the sample into the test tube for measurement, so the portable nuclear magnetic resonance instrument needs a magnetic field with high space utilization, high uniformity, small size, light weight, and magnetic flux leakage. Less, permanent magnets for measurements on samples in test tubes.
实用新型内容Utility model content
(一)要解决的技术问题(1) Technical problems to be solved
本实用新型要解决的技术问题是解决现有核磁共振仪器的永磁体无法提供适合的磁场强度、均匀度，而且整个设备的尺寸和重量较大，对试管中样品进行测量造成不便的问题。The technical problem to be solved by the utility model is to solve the problem that the permanent magnet of the existing nuclear magnetic resonance instrument cannot provide suitable magnetic field strength and uniformity, and the size and weight of the whole equipment are relatively large, which causes inconvenience to the measurement of the sample in the test tube.
(二)技术方案(2) Technical solution
为了解决上述技术问题，本实用新型提供了一种用于核磁共振探头的永磁体装置，包括柱状永磁体和锥状永磁体，所述柱状永磁体的中部设有柱形空腔，所述锥状永磁体的中部设有锥形空腔，所述锥状永磁体的底面与所述柱状永磁体的轴向横截面的形状相同且大小相等，所述柱状永磁体的一端面与所述锥状永磁体的底面同轴连接，以将所述柱形空腔与所述锥形空腔连通。In order to solve the above technical problems, the utility model provides a permanent magnet device for nuclear magnetic resonance probes, including a columnar permanent magnet and a cone-shaped permanent magnet, the middle of the columnar permanent magnet is provided with a columnar cavity, and the cone The middle part of the permanent magnet is provided with a conical cavity, and the bottom surface of the permanent magnet of the conical shape has the same shape and the same size as the axial cross-section of the permanent magnet of the cylindrical shape. The bottom surface of the shaped permanent magnet is coaxially connected to communicate the cylindrical cavity with the conical cavity.
其中，所述柱状永磁体的轴向横截面为正N边形，N＝2M，M为大于2的整数，所述柱状永磁体由N个相同的三棱柱永磁块沿圆周方向依次连接组成，所述三棱柱永磁块的横截面为等腰三角形；在所述柱状永磁体的轴向横截面中，每个所述等腰三角形的一条腰和与其相邻的等腰三角形的底边重合，另一条腰所在的所述三棱柱永磁块的侧面构成所述柱状永磁体的侧面。Wherein, the axial cross-section of the columnar permanent magnet is a regular N-gon, N= 2M , M is an integer greater than 2, and the columnar permanent magnet is sequentially connected by N identical triangular prism permanent magnet blocks along the circumferential direction Composition, the cross section of the triangular prism permanent magnet block is an isosceles triangle; in the axial cross section of the columnar permanent magnet, one waist of each said isosceles triangle and the base of the adjacent isosceles The sides coincide, and the side of the triangular prism permanent magnet where the other waist is located constitutes the side of the columnar permanent magnet.
其中，所述锥状永磁体由N个相同的且与所述三棱柱永磁块一一对应的三棱锥永磁块沿圆周方向依次连接组成，所述三棱锥永磁块的底面组成所述锥状永磁体的底面，且所述三棱锥永磁块的底面为与所述三棱柱永磁块的横截面形状相同且大小相等的等腰三角形；在所述锥状永磁体的底面中，每个所述等腰三角形的一条腰和与其相邻的等腰三角形的底边重合，另一条腰边所在所述三棱锥永磁块的侧面构成所述锥状永磁体的侧面。Wherein, the conical permanent magnet is composed of N identical triangular pyramidal permanent magnets corresponding to the triangular prism permanent magnets one by one along the circumferential direction, and the bottom surface of the triangular pyramidal permanent magnets forms the The bottom surface of the conical permanent magnet, and the bottom surface of the triangular pyramid permanent magnet block is an isosceles triangle with the same cross-sectional shape and equal size as the triangular prism permanent magnet block; in the bottom surface of the conical permanent magnet, One waist of each isosceles triangle coincides with the base of its adjacent isosceles triangle, and the side of the triangular pyramid permanent magnet where the other waist is located constitutes the side of the tapered permanent magnet.
其中，所述锥状永磁体的底面的磁场强度与其所连接的所述柱状永磁体的端面的磁场强度大小相等。Wherein, the magnetic field intensity of the bottom surface of the conical permanent magnet is equal to the magnetic field intensity of the end surface of the columnar permanent magnet to which it is connected.
其中，每个所述三棱柱永磁块和与其相邻的所述三棱柱永磁块粘接在一起。Wherein, each of the triangular prism permanent magnet blocks is glued together with the adjacent triangular prism permanent magnet blocks.
其中，每个所述三棱锥永磁块和与其相邻的所述三棱锥永磁块粘接在一起。Wherein, each of the triangular pyramid permanent magnet blocks is glued together with the adjacent triangular pyramid permanent magnet blocks.
其中，所述柱状永磁体与所述锥状永磁体粘接在一起。Wherein, the columnar permanent magnet and the conical permanent magnet are bonded together.
其中，若所述柱状永磁体的轴线为空间坐标系的z轴，则每个所述三棱柱永磁块的磁化方向与空间坐标系的y轴的夹角为其横截面的中心与所述柱状永磁体的轴向横截面的中心的连线与空间坐标系的y轴的夹角的两倍。Wherein, if the axis of the columnar permanent magnet is the z-axis of the space coordinate system, the included angle between the magnetization direction of each triangular prism permanent magnet block and the y-axis of the space coordinate system is the center of its cross section and the Twice the included angle between the center of the axial cross-section of the columnar permanent magnet and the y-axis of the space coordinate system.
其中，每个所述三棱锥永磁块的磁化方向与其所对应的所述三棱柱永磁块的磁化方向相同。Wherein, the magnetization direction of each triangular pyramid permanent magnet block is the same as that of the corresponding triangular prism permanent magnet block.
其中，所述柱状永磁体与所述锥状永磁体在所述柱状永磁体的轴线方向上的磁场方向相同。Wherein, the magnetic field directions of the columnar permanent magnets and the tapered permanent magnets in the axial direction of the columnar permanent magnets are the same.
(三)有益效果(3) Beneficial effects
本实用新型的上述技术方案具有如下优点：本实用新型用于核磁共振探头的永磁体装置提供了一种铅笔形永磁体，该永磁体的锥状永磁体的底面叠加在柱状永磁体的一个端面上，其内部设有柱形空腔与锥形空腔连通形成的铅笔形空腔，本实用新型的均匀磁场区向锥状永磁体方向偏离柱状永磁体的中心，在使用带有本实用新型的NMR仪器测量试管中的样品时，永磁体的形状与试管的形状相似，均匀磁场区在铅笔形永磁体中空间位置与测试样品在试管中的空间位置相符合，永磁体装置的结构更加合理，因此显著提高了磁场空间利用率，从而有效的减小磁体尺寸，减轻磁体重量。同时，无需铁磁材料构成闭合回路以及提高了中空腔体内的磁场均匀度，克服了极板式磁体庞大和笨重，不利于携带的缺点，极大的减少了铁磁材料的用量，磁场空间利用率高，本实用新型的铅笔形永磁体在柱状永磁体的周向，以及锥状永磁体的外侧漏磁很小，故磁能利用率高，获得同样的磁场强度所需的永磁材料少。适用于便携式核磁共振仪器对试管中样品的检测。The above technical solution of the utility model has the following advantages: the utility model is used for the permanent magnet device of the nuclear magnetic resonance probe to provide a pencil-shaped permanent magnet, and the bottom surface of the conical permanent magnet of the permanent magnet is superimposed on an end surface of the columnar permanent magnet On the inside, there is a pencil-shaped cavity formed by the communication between the cylindrical cavity and the conical cavity. The uniform magnetic field area of the utility model deviates from the center of the columnar permanent magnet in the direction of the conical permanent magnet. When the advanced NMR instrument measures the sample in the test tube, the shape of the permanent magnet is similar to the shape of the test tube, and the spatial position of the uniform magnetic field in the pencil-shaped permanent magnet is consistent with the spatial position of the test sample in the test tube, and the structure of the permanent magnet device is more reasonable. , thus significantly improving the space utilization of the magnetic field, thereby effectively reducing the size and weight of the magnet. At the same time, there is no need for ferromagnetic materials to form a closed loop and the uniformity of the magnetic field in the hollow cavity is improved, which overcomes the disadvantages of large and bulky pole plate magnets and is not conducive to carrying, greatly reduces the amount of ferromagnetic materials used, and improves the utilization of magnetic field space. High, the pencil-shaped permanent magnet of the present utility model has very little flux leakage in the circumferential direction of the columnar permanent magnet and the outside of the cone-shaped permanent magnet, so the utilization rate of magnetic energy is high, and the required permanent magnet materials for obtaining the same magnetic field strength are few. It is suitable for the detection of samples in test tubes by portable nuclear magnetic resonance instruments.
除了上面所描述的本实用新型解决的技术问题、构成的技术方案的技术特征以及有这些技术方案的技术特征所带来的优点之外，本实用新型的其他技术特征及这些技术特征带来的优点，将结合附图作出进一步说明。In addition to the technical problems solved by the utility model described above, the technical features of the technical solutions formed and the advantages brought by the technical features of these technical solutions, other technical features of the utility model and the advantages brought by these technical features The advantages will be further explained in conjunction with the accompanying drawings.
附图说明Description of drawings
图1是本实用新型实施例用于核磁共振探头的永磁体装置的结构示意图；Fig. 1 is the structural representation of the permanent magnet device that the utility model embodiment is used for nuclear magnetic resonance probe;
图2是本实用新型实施例用于核磁共振探头的永磁体装置的柱状永磁体的结构示意图；Fig. 2 is the schematic structural view of the columnar permanent magnet used in the permanent magnet device of the nuclear magnetic resonance probe according to the embodiment of the present invention;
图3是本实用新型实施例用于核磁共振探头的永磁体装置的锥状永磁体的结构示意图；Fig. 3 is the structural representation of the conical permanent magnet used in the permanent magnet device of the nuclear magnetic resonance probe according to the embodiment of the utility model;
图4是本实用新型实施例用于核磁共振探头的永磁体装置的柱状永磁体的轴向截面图；Fig. 4 is the axial sectional view of the columnar permanent magnet used in the permanent magnet device of the nuclear magnetic resonance probe according to the embodiment of the utility model;
图5是本实用新型实施例用于核磁共振探头的永磁体装置的锥状永磁体的俯视图。Fig. 5 is a top view of the conical permanent magnet used in the permanent magnet device of the nuclear magnetic resonance probe according to the embodiment of the present invention.
图中：10：柱状永磁体；20：锥状永磁体；30：柱形空腔；40：锥形空腔；101：三棱柱永磁块；201：三棱锥永磁块。In the figure: 10: columnar permanent magnet; 20: conical permanent magnet; 30: columnar cavity; 40: conical cavity; 101: triangular prism permanent magnet; 201: triangular pyramidal permanent magnet.
具体实施方式detailed description
为使本实用新型实施例的目的、技术方案和优点更加清楚，下面将结合本实用新型实施例中的附图，对本实用新型实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本实用新型的一部分实施例，而不是全部的实施例。基于本实用新型中的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例，都属于本实用新型保护的范围。In order to make the purpose, technical solutions and advantages of the embodiments of the utility model more clear, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model. Obviously, the described The embodiments are some embodiments of the present utility model, but not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.
在本实用新型的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本实用新型中的具体含义。In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.
此外，在本实用新型的描述中，除非另有说明，“多个”、“多根”、“多组”的含义是两个或两个以上，“若干个”、“若干根”、“若干组”的含义是一个或一个以上。In addition, in the description of the present utility model, unless otherwise specified, the meanings of "multiple", "multiple roots" and "multiple groups" are two or more, "several", "several roots", "several "Several groups" means one or more than one.
如图1所示，本实用新型实施例提供的用于核磁共振探头的永磁体装置，包括柱状永磁体10和锥状永磁体20，柱状永磁体10的中部设有柱形空腔30，柱形空腔30的轴向横截面与柱状永磁体10的轴向横截面的形状相同；锥状永磁体20的中部设有锥形空腔40，锥状永磁体20的底面与柱状永磁体10的轴向横截面的形状相同且大小相等，锥形空腔40在锥状永磁体20的底面处的截面与柱形空腔30的轴向横截面的形状相同且大小相等；柱状永磁体10的一端面与锥状永磁体20的底面同轴连接，以将柱形空腔30与锥形空腔40连通。As shown in Figure 1, the permanent magnet device for nuclear magnetic resonance probe that the utility model embodiment provides, comprises columnar permanent magnet 10 and cone-shaped permanent magnet 20, and the middle part of columnar permanent magnet 10 is provided with columnar cavity 30, columnar The axial cross section of shaped cavity 30 is identical with the shape of the axial cross section of columnar permanent magnet 10; The shape of the axial cross-section of the tapered cavity 40 is the same and the size is equal, and the cross-section of the conical cavity 40 at the bottom surface of the conical permanent magnet 20 is the same as the shape and size of the axial cross-section of the cylindrical cavity 30; the cylindrical permanent magnet 10 One end surface of one end surface is coaxially connected with the bottom surface of the conical permanent magnet 20 to communicate the cylindrical cavity 30 with the conical cavity 40 .
本实用新型用于核磁共振探头的永磁体装置提供了一种铅笔形永磁体，该永磁体的锥状永磁体的底面叠加在柱状永磁体的一个端面上，其内部设有柱形空腔与锥形空腔连通形成的铅笔形空腔，本实用新型的均匀磁场区向锥状永磁体方向偏离柱状永磁体的中心，在使用本实用新型的NMR仪器测量试管中的样品时，永磁体的形状与试管的形状相似，均匀磁场区在铅笔形永磁体中空间位置与测试样品在试管中的空间位置相符合，永磁体装置的结构更加合理，因此显著提高了磁场空间利用率，从而有效的减小磁体尺寸，减轻磁体重量。同时，无需铁磁材料构成闭合回路以及提高了中空腔体内的磁场均匀度，克服了极板式磁体庞大和笨重，不利于携带的缺点，极大的减少了铁磁材料的用量，磁场空间利用率高，本实用新型的铅笔形永磁体在柱状永磁体的周向，以及锥状永磁体的外侧漏磁很小，故磁能利用率高，获得同样的磁场强度所需的永磁材料少。适用于便携式核磁共振仪器对试管中样品的检测。The utility model is used for the permanent magnet device of nuclear magnetic resonance probe and provides a kind of pencil-shaped permanent magnet, and the bottom surface of the cone-shaped permanent magnet of this permanent magnet is superimposed on an end surface of the columnar permanent magnet, and its interior is provided with columnar cavity and The pencil-shaped cavity formed by the conical cavity is connected, and the uniform magnetic field area of the utility model deviates from the center of the columnar permanent magnet to the direction of the conical permanent magnet. When using the NMR instrument of the utility model to measure the sample in the test tube, the permanent magnet The shape is similar to the shape of the test tube, and the space position of the uniform magnetic field in the pencil-shaped permanent magnet is consistent with the space position of the test sample in the test tube. Reduce the size of the magnet and reduce the weight of the magnet. At the same time, there is no need for ferromagnetic materials to form a closed loop and the uniformity of the magnetic field in the hollow cavity is improved, which overcomes the disadvantages of large and bulky pole plate magnets and is not conducive to carrying, greatly reduces the amount of ferromagnetic materials used, and improves the utilization of magnetic field space. High, the pencil-shaped permanent magnet of the present utility model has very little flux leakage in the circumferential direction of the columnar permanent magnet and the outside of the cone-shaped permanent magnet, so the utilization rate of magnetic energy is high, and the required permanent magnet materials for obtaining the same magnetic field strength are few. It is suitable for the detection of samples in test tubes by portable nuclear magnetic resonance instruments.
其中，如图2和图4所示，柱状永磁体10的轴向横截面为正N边形，N＝2M，M为大于2的整数，柱状永磁体10由N个相同的三棱柱永磁块101沿圆周方向依次连接组成，三棱柱永磁块101的横截面为等腰三角形；在柱状永磁体10的轴向横截面中，每个等腰三角形的一条腰和与其相邻的等腰三角形的底边重合，另一条腰所在的三棱柱永磁块101的侧面构成柱状永磁体10的侧面。其中，每个三棱柱永磁块101与其相邻的三棱柱永磁块101粘接在一起。柱状永磁体设计为正N棱柱的形式，中空的柱状永磁体根据其正N边形的轴向横截面沿圆周方向等分为的N个横截面为等腰三角形的三棱柱永磁块，便于实际生产制造加工与使用时的安装拆卸，且相邻的两个等腰三角形位置关系是其中一个等腰三角形的腰和另外一个等腰三角形的底边重合，等腰三角形的腰与底边的夹角为N为永磁体装置沿圆周方向等分的块数。如图2所示，本实施例的中空的柱状永磁体由大小相等、形状相同的8块横截面为等腰三角形的三棱柱永磁块1、2、3、4、5、6、7和8组成，通过强力胶粘连构成一个中空的柱状体，中空柱状体的空腔内是均匀的磁场，图2中实箭头所示为各三棱柱永磁块的磁化方向，空心箭头为柱状永磁体内磁场方向。Wherein, as shown in Figure 2 and Figure 4, the axial cross-section of the columnar permanent magnet 10 is a regular N-gon, N= 2M , M is an integer greater than 2, and the columnar permanent magnet 10 is composed of N identical triangular prism permanent The magnetic block 101 is connected successively along the circumferential direction to form, and the cross section of the triangular prism permanent magnet block 101 is an isosceles triangle; The bases of the waist triangles overlap, and the side of the triangular prism permanent magnet block 101 where the other waist is located constitutes the side of the columnar permanent magnet 10 . Wherein, each triangular prism permanent magnet block 101 is glued together with its adjacent triangular prism permanent magnet block 101 . The columnar permanent magnet is designed in the form of a positive N prism. The hollow columnar permanent magnet is divided into N triangular prism permanent magnet blocks with isosceles triangle cross-sections along the circumferential direction according to its regular N-gon axial cross-section, which is convenient Installation and disassembly during actual manufacturing, processing and use, and the positional relationship between two adjacent isosceles triangles is that the waist of one isosceles triangle coincides with the base of the other isosceles triangle, and the waist and base of the isosceles triangle Angle is N is the number of blocks equally divided by the permanent magnet device along the circumferential direction. As shown in Figure 2, the hollow columnar permanent magnet of the present embodiment consists of 8 pieces of equal-sized and identically shaped cross-sections that are triangular prism permanent magnet blocks 1, 2, 3, 4, 5, 6, 7 and 8 components, a hollow columnar body is formed by strong glue adhesion, and the cavity of the hollow columnar body is a uniform magnetic field. The solid arrows in Figure 2 show the magnetization directions of the triangular prism permanent magnet blocks, and the hollow arrows indicate the The direction of the magnetic field inside the magnet.
其中，如图3和图5所示，锥状永磁体20由N个相同的且与三棱柱永磁块101一一对应的三棱锥永磁块201沿圆周方向依次连接组成，三棱锥永磁块201的底面组成锥状永磁体20的底面，且三棱锥永磁块201的底面为与三棱柱永磁块101的横截面形状相同且大小相等的等腰三角形；在锥状永磁体20的底面中，每个等腰三角形的一条腰和与其相邻的等腰三角形的底边重合，另一条腰边所在三棱锥永磁块201的侧面构成锥状永磁体20的侧面。其中，每个三棱锥永磁块201与其相邻的三棱锥永磁块201粘接在一起。其中，柱状永磁体10与锥状永磁体20粘接在一起。中空的锥状永磁体根据其正N边形的端面沿圆周方向等分为N个底面为等腰三角形的三棱锥永磁块，且相邻的两个等腰三角形位置关系是其中一个等腰三角形的腰和另外一个等腰三角形的底边重合，等腰三角形的腰与底边的夹角为N为永磁体装置沿圆周方向等分的块数。如图3所示，中空的锥状永磁体由大小相等、形状相同的8块底面为等腰三角形的三棱锥永磁块1'、2'、3'、4'、5'、6'、7'和8'组成，通过强力胶粘连构成一个中空的锥状体，且分别对应三棱柱永磁块1、2、3、4、5、6、7和8通过强力胶粘连，图3中实箭头所示为各三棱锥永磁块的磁化方向，空心箭头为锥状永磁体内磁场方向。Wherein, as shown in Fig. 3 and Fig. 5, the conical permanent magnet 20 is made up of N identical triangular pyramid permanent magnet blocks 201 corresponding one-to-one with the triangular prism permanent magnet block 101 along the circumferential direction, and the triangular pyramid permanent magnet The bottom surface of block 201 forms the bottom surface of conical permanent magnet 20, and the bottom surface of triangular pyramid permanent magnet block 201 is the isosceles triangle identical with the cross-sectional shape of triangular prism permanent magnet block 101 and equal in size; In the bottom surface, one waist of each isosceles triangle coincides with the bottom of its adjacent isosceles triangle, and the side of the triangular pyramid permanent magnet block 201 where the other waist is located constitutes the side of the conical permanent magnet 20 . Wherein, each triangular pyramid permanent magnet block 201 is glued together with its adjacent triangular pyramid permanent magnet block 201 . Wherein, the columnar permanent magnet 10 and the conical permanent magnet 20 are bonded together. The hollow conical permanent magnet is equally divided into N triangular pyramidal permanent magnet blocks whose base is isosceles triangle according to its regular N-sided end face along the circumferential direction, and the positional relationship between the two adjacent isosceles triangles is one of the isosceles triangles. The waist of the triangle coincides with the base of another isosceles triangle, and the angle between the waist and the base of the isosceles triangle is N is the number of blocks equally divided by the permanent magnet device along the circumferential direction. As shown in Figure 3, the hollow conical permanent magnet consists of 8 triangular pyramidal permanent magnet blocks 1', 2', 3', 4', 5', 6', 7' and 8', which form a hollow cone through strong glue, and correspond to triangular prism permanent magnet blocks 1, 2, 3, 4, 5, 6, 7 and 8 through strong glue, as shown in Fig. The solid arrows in 3 show the magnetization direction of each triangular pyramidal permanent magnet block, and the hollow arrows show the magnetic field direction in the conical permanent magnet.
本实用新型的中空的柱状永磁体的轴向横截面和中空的锥状永磁体的底面均为中空的正N边形，边长为分别等分成三棱柱和三棱锥永磁块后等腰三角形横截面的腰。本实用新型通过增加周向永磁块数来提高横截面上的横向磁场均匀度。柱状和锥状两种永磁体的磁场相互作用，在铅笔形磁体的中空腔体内，各磁场分量获得有效的补偿。从而提高轴向上横向磁场的均匀度，相对减小了磁体的体积，减轻了仪器的重量。本实用新型等腰三角形横截面的三棱柱永磁块和三棱锥永磁块的设置，使组成柱状体和锥状体的周向相邻磁块之间不存在很明显的同性相斥的行为，提高了永磁材料的利用率，降低加工成本，也因此使安装方便快捷。The axial cross-section of the hollow columnar permanent magnet of the utility model and the bottom surface of the hollow conical permanent magnet are hollow regular N-gons, and the side length is an isosceles triangle after being equally divided into triangular prisms and triangular pyramid permanent magnet blocks. Cross-section of the waist. The utility model improves the uniformity of the transverse magnetic field on the cross section by increasing the number of circumferential permanent magnet blocks. The magnetic fields of the columnar and conical permanent magnets interact with each other, and each magnetic field component is effectively compensated in the hollow cavity of the pencil-shaped magnet. Therefore, the uniformity of the transverse magnetic field in the axial direction is improved, the volume of the magnet is relatively reduced, and the weight of the instrument is reduced. The arrangement of the triangular prism permanent magnet block and the triangular pyramid permanent magnet block of the isosceles triangular cross-section of the utility model makes there be no obvious same-sex repulsion behavior between the circumferentially adjacent magnetic blocks forming the columnar body and the cone-shaped body, improving the It improves the utilization rate of the permanent magnet material, reduces the processing cost, and thus makes the installation convenient and quick.
其中，锥状永磁体20的底面的磁场强度与其所连接的柱状永磁体10的端面的磁场强度大小相等。其中，若柱状永磁体10的轴线为空间坐标系的z轴，则每个三棱柱永磁块101的磁化方向与空间坐标系的y轴的夹角为其横截面的中心与柱状永磁体10的轴向横截面的中心的连线与空间坐标系的y轴的夹角的两倍。其中，每个三棱锥永磁块201的磁化方向与其所对应的三棱柱永磁块101的磁化方向相同。组成中空的柱状永磁体的各三棱柱永磁块形状相同、磁场强度大小相等，组成中空的锥状永磁体的各三棱锥永磁块形状相同、磁场强度大小相等，且每个三棱锥永磁块的磁场强度与其所连接的三棱柱永磁块的磁场强度大小相等，由此锥状永磁体的底面与其所连接的柱状永磁体的端面的磁场强度大小相等，每个三棱锥永磁块内的磁场强度分布均匀，所以N个三棱锥永磁块组成的锥状永磁体的锥形空腔的磁场强度由底面至顶端逐渐变大。各三棱柱永磁块的磁场强度大小相同，任取其中一个编号为1，顺时针方向依次为各三棱柱永磁块编号，y轴取在第一块和最后一块三棱柱永磁块粘接处的中间位置，x轴与y轴垂直。柱状永磁体的轴线作为空间坐标系的z轴垂直于x轴与y轴所在的平面。若第i块三棱柱永磁块的横截面中心与柱状永磁体的轴向横截面的中心的连线和y轴夹角定义为磁块旋转方向θi，则第i块磁体的磁化方向与y轴夹角一般而言，若永磁体被等分为N块(N＝2M，M为大于2的整数)永磁块，且永磁块的旋转方向为则第i个永磁块的磁化方向与y轴夹角即ωi＝2θi，永磁块的磁化方向是磁体本身旋转方向的两倍。Wherein, the magnetic field intensity of the bottom surface of the conical permanent magnet 20 is equal to the magnetic field intensity of the end surface of the columnar permanent magnet 10 connected thereto. Wherein, if the axis of the columnar permanent magnet 10 is the z-axis of the space coordinate system, the included angle between the magnetization direction of each triangular prism permanent magnet block 101 and the y-axis of the space coordinate system is the center of its cross section and the columnar permanent magnet 10 The angle between the line connecting the center of the axial cross-section and the y-axis of the space coordinate system is twice. Wherein, the magnetization direction of each triangular pyramid permanent magnet block 201 is the same as that of the corresponding triangular prism permanent magnet block 101 . The triangular prism permanent magnet blocks that make up the hollow columnar permanent magnet have the same shape and the same magnetic field strength, and the triangular pyramid permanent magnet blocks that make up the hollow conical permanent magnet have the same shape and the same magnetic field strength, and each triangular pyramid permanent magnet The magnetic field strength of the block is equal to the magnetic field strength of the triangular prism permanent magnet block it is connected to, thus the magnetic field strength of the bottom surface of the conical permanent magnet and the end face of the columnar permanent magnet connected thereto is equal, and each triangular pyramid permanent magnet block The distribution of the magnetic field intensity is uniform, so the magnetic field intensity of the conical cavity of the conical permanent magnet composed of N triangular pyramidal permanent magnet blocks gradually increases from the bottom surface to the top. The magnetic field strength of each triangular prism permanent magnet block is the same, and one of them is numbered as 1, and the clockwise direction is sequentially numbered for each triangular prism permanent magnet block, and the y-axis takes the first and last triangular prism permanent magnet block for bonding At the middle position, the x-axis is perpendicular to the y-axis. The axis of the columnar permanent magnet serves as the z-axis of the space coordinate system and is perpendicular to the plane where the x-axis and y-axis are located. If the angle between the center of the cross-section of the i-th triangular prism permanent magnet block and the center of the axial cross-section of the columnar permanent magnet and the y-axis is defined as the rotation direction θ i of the magnetic block, Then the angle between the magnetization direction of the i-th magnet and the y-axis Generally speaking, if the permanent magnet is divided into N pieces (N=2 M , M is an integer greater than 2) permanent magnet pieces, and the rotation direction of the permanent magnet pieces is Then the angle between the magnetization direction of the i-th permanent magnet block and the y-axis That is, ω i =2θ i , the magnetization direction of the permanent magnet block is twice the rotation direction of the magnet itself.
若永磁体中每一点的磁化方向能按给定的永磁体本身旋转2倍方向连续变化，理论上整个中空柱状体内磁场空间的不均匀性为零，因此采用磁体分块的方法。磁体等分的块数越多，越接近理想状况。If the magnetization direction of each point in the permanent magnet can be changed continuously according to the given permanent magnet itself, the inhomogeneity of the magnetic field space in the entire hollow column is theoretically zero, so the method of magnet division is adopted. The more blocks the magnet is equally divided, the closer to the ideal situation.
其中，如图1所示，柱状永磁体10与锥状永磁体20在柱状永磁体10的轴线方向上的磁场方向相同。本实用新型的中空的锥状永磁体刚好在中空的柱状永磁体的外侧封闭柱状永磁体的端部，锥状永磁体和柱状永磁体在柱形空腔内轴线上的磁场方向一致，用以补偿柱状永磁体端部的横向磁场。Wherein, as shown in FIG. 1 , the magnetic field directions of the columnar permanent magnet 10 and the conical permanent magnet 20 in the axial direction of the columnar permanent magnet 10 are the same. The hollow conical permanent magnet of the utility model just closes the end of the cylindrical permanent magnet on the outside of the hollow cylindrical permanent magnet, and the magnetic field directions of the conical permanent magnet and the cylindrical permanent magnet on the axis of the cylindrical cavity are consistent, so as to Compensate the transverse magnetic field at the end of the cylindrical permanent magnet.
综上所述，本实用新型用于核磁共振探头的永磁体装置提供了一种铅笔形永磁体，该永磁体的锥状永磁体的底面叠加在柱状永磁体的一个端面上，其内部设有柱形空腔与锥形空腔连通形成的铅笔形空腔，本实用新型的均匀磁场区向锥状永磁体方向偏离柱状永磁体的中心，在使用本实用新型的NMR仪器测量试管中的样品时，永磁体的形状与试管的形状相似，均匀磁场区在铅笔形永磁体中空间位置与测试样品在试管中的空间位置相符合，永磁体装置的结构更加合理，因此显著提高了磁场空间利用率，从而有效的减小磁体尺寸，减轻磁体重量。同时，无需铁磁材料构成闭合回路以及提高了中空腔体内的磁场均匀度，克服了极板式磁体庞大和笨重，不利于携带的缺点，极大的减少了铁磁材料的用量，磁场空间利用率高，本实用新型的铅笔形永磁体在柱状永磁体的周向，以及锥状永磁体的外侧漏磁很小，故磁能利用率高，获得同样的磁场强度所需的永磁材料少。适用于便携式核磁共振仪器对试管中样品的检测。In summary, the utility model is used for the permanent magnet device of the nuclear magnetic resonance probe to provide a pencil-shaped permanent magnet, the bottom surface of the conical permanent magnet of the permanent magnet is superimposed on an end surface of the columnar permanent magnet, and the interior is provided with The pencil-shaped cavity formed by the communication between the cylindrical cavity and the conical cavity, the uniform magnetic field area of the utility model deviates from the center of the columnar permanent magnet to the direction of the conical permanent magnet, and the sample in the test tube is measured by the NMR instrument of the utility model , the shape of the permanent magnet is similar to that of the test tube, and the spatial position of the uniform magnetic field in the pencil-shaped permanent magnet coincides with the spatial position of the test sample in the test tube. The structure of the permanent magnet device is more reasonable, so the space utilization of the magnetic field is significantly improved. rate, thereby effectively reducing the size of the magnet and reducing the weight of the magnet. At the same time, there is no need for ferromagnetic materials to form a closed loop and the uniformity of the magnetic field in the hollow cavity is improved, which overcomes the disadvantages of large and bulky pole plate magnets and is not conducive to carrying, greatly reduces the amount of ferromagnetic materials used, and improves the utilization of magnetic field space. High, the pencil-shaped permanent magnet of the present utility model has very little flux leakage in the circumferential direction of the columnar permanent magnet and the outside of the cone-shaped permanent magnet, so the utilization rate of magnetic energy is high, and the required permanent magnet materials for obtaining the same magnetic field strength are few. It is suitable for the detection of samples in test tubes by portable nuclear magnetic resonance instruments.
最后应说明的是：以上实施例仅用以说明本实用新型的技术方案，而非对其限制；尽管参照前述实施例对本实用新型进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本实用新型各实施例技术方案的精神和范围。Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit of the technical solutions of the various embodiments of the present invention. and range.
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2016
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105957686A (en) * | 2016-06-22 | 2016-09-21 | 北京工业大学 | Permanent magnet device used for nuclear magnetic resonance probe |
| CN105957686B (en) * | 2016-06-22 | 2017-10-27 | 北京工业大学 | A kind of permanent magnet device for nmr probe |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20170118 Effective date of abandoning: 20171027 |
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| AV01 | Patent right actively abandoned |