CN111243854B - Magnetic resonance superconducting coil winding method and magnetic resonance superconducting coil - Google Patents
Magnetic resonance superconducting coil winding method and magnetic resonance superconducting coil Download PDFInfo
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- CN111243854B CN111243854B CN202010346693.5A CN202010346693A CN111243854B CN 111243854 B CN111243854 B CN 111243854B CN 202010346693 A CN202010346693 A CN 202010346693A CN 111243854 B CN111243854 B CN 111243854B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/06—Coil winding
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
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Abstract
The invention discloses a magnetic resonance superconducting coil winding method and a magnetic resonance superconducting coil. The winding method comprises the following steps: the superconducting coil is characterized in that a plurality of superconducting layers are sequentially arranged outside a coil framework, in each superconducting layer, a superconducting wire wound on an inner structure of the superconducting wire and a plurality of layers of first glass fiber cloth wrapped outside the superconducting wire are sequentially arranged from inside to outside, and black glue is brushed outside the first glass fiber cloth on the outermost layer in the superconducting layers; winding a binding wire outside the outermost superconducting layer to form a binding wire layer; and coating a second glass fiber cloth outside the binding wire layer, and uniformly brushing black glue outside the second glass fiber cloth for curing to obtain the magnetic resonance superconducting coil. The mode of paving glass fiber cloth and brushing black glue is adopted for fixing among different layers of superconducting wires, compared with the mode of vacuum grease dipping, gaps among the superconducting wires can be filled more fully, the fixing effect on the superconducting wires is better, the fixing reliability among all layers of superconducting wires can be ensured, and the risk of energy loss caused by the fact that the superconducting wires generate energy due to power-on stress displacement during excitation is reduced.
Description
Technical Field
The invention relates to the technical field of magnetic resonance equipment, in particular to a magnetic resonance superconducting coil winding method and a magnetic resonance superconducting coil.
Background
At present, the superconducting magnet has strict technical requirements on the magnetic field stability, for example, clinical medical imaging requires that the magnetic field stability of the MRI superconducting magnet is less than 0.1ppm/h, so that the superconducting magnet works in a closed-loop operation mode, that is, after the excitation of the superconducting magnet is finished, a power supply and a current lead are removed, so that the MRI superconducting coil and the superconducting switch form a closed loop. Because the superconducting switch is in a superconducting state and the resistance of the superconducting joint is small, the magnetic field of the MRI superconducting magnet is not obviously attenuated for a long time, and the magnetic field has high magnetic field stability. To achieve such magnetic field stability, there is a relatively high technical requirement for the winding process of the MRI superconducting magnet coil: firstly, the relative positions of the superconducting layers and the turns in the coil must be fixed firmly; and secondly, the position of the superconducting wire in the coil is not moved after excitation.
For a superconducting magnet, the fixation and protection of a superconducting wire in a superconducting coil are important, the conventional superconducting coil is formed by adding a copper plate with a thickness of 0.5mm and a through hole on the periphery after the superconducting wire is wound, fixing the copper plate on the periphery by winding a binding wire, and then carrying out vacuum grease dipping. After the vacuum grease dipping is finished, the excess resin on the surface of the coil is buckled by a chisel and a straight screwdriver.
However, in the vacuum grease impregnation, the resin has poor fluidity, and the copper plate with holes and the binding wire are wound on the periphery of the superconducting wire, so that the condition of insufficient resin infiltration may occur, the superconducting wire cannot be effectively fixed, and the risk of quenching caused by energy generated by the displacement of the superconducting wire due to the power-on stress during excitation is increased.
Therefore, how to improve the reliability of the fixation of the superconducting wire is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method for winding a magnetic resonance superconducting coil, which can improve reliability of fixing a superconducting wire. Another object of the present invention is to provide a magnetic resonance superconducting coil manufactured by the method for winding a magnetic resonance superconducting coil, wherein the reliability of the fixing of the superconducting wire is high.
In order to achieve the purpose, the invention provides the following technical scheme:
a magnetic resonance superconducting coil winding method comprises the following steps:
the superconducting coil comprises a coil framework, a plurality of superconducting layers and a plurality of layers of first glass fiber cloth, wherein the plurality of superconducting layers are sequentially arranged outside the coil framework, the superconducting wires wound on an inner structure of each superconducting layer and the plurality of layers of first glass fiber cloth wrapped outside the superconducting wires are sequentially arranged in each superconducting layer from inside to outside, and black glue is brushed outside the first glass fiber cloth on the outermost layer in each superconducting layer;
winding a binding wire outside the superconducting layer on the outermost layer to form a binding wire layer;
and coating a second glass fiber cloth outside the binding wire layer, and uniformly brushing black glue outside the second glass fiber cloth for curing to obtain the magnetic resonance superconducting coil.
Preferably, in the superconducting layer, black glue is brushed outside each layer of the first glass fiber cloth.
Preferably, the binding-wire is a copper wire or a stainless steel wire.
Preferably, the winding of the binding-wire outside the outermost superconducting layer to constitute a binding-wire layer includes:
and laying a clapboard with holes outside the superconducting layer on the outermost layer, and then winding the binding wire outside the clapboard to form the binding wire layer.
Preferably, the separator is a copper plate.
A magnetic resonance superconducting coil is manufactured by applying the winding method of the magnetic resonance superconducting coil.
The invention provides a method for winding a magnetic resonance superconducting coil, which comprises the following steps: the superconducting coil is characterized in that a plurality of superconducting layers are sequentially arranged outside a coil framework, in each superconducting layer, a superconducting wire wound on an inner structure of the superconducting wire and a plurality of layers of first glass fiber cloth wrapped outside the superconducting wire are sequentially arranged from inside to outside, and black glue is brushed outside the first glass fiber cloth on the outermost layer in the superconducting layers; winding a binding wire outside the superconducting layer on the outermost layer to form a binding wire layer; and coating a second glass fiber cloth outside the binding wire layer, and uniformly brushing black glue outside the second glass fiber cloth for curing to obtain the magnetic resonance superconducting coil.
Every superconducting wire is wound, glass fiber cloth is wound on the surface of the superconducting wire, black glue is brushed on the superconducting wires, the operation is repeated in a circulating mode until all the superconducting wires are wound, namely different layers of superconducting wires are fixed in a mode of paving the glass fiber cloth and brushing the black glue, gaps among the superconducting wires can be filled more fully compared with a vacuum grease dipping mode, the fixing effect on the superconducting wires is better, the connection reliability among all the superconducting wires can be guaranteed, and the risk of energy loss caused by the fact that the superconducting wires generate energy due to power-on stress displacement during excitation is reduced. After each layer of superconducting layer is completely arranged, the superconducting wire is further bound and reinforced by the binding wire and is fixed by the black glue again, and the fixing effect of the superconducting wire can be further improved. Meanwhile, the superconducting wire is fixed by the black glue with strong heat conductivity, heat generated in the excitation process and the use process after the excitation is finished can be timely dissipated, the risk of quench is further reduced, the liquid helium cost is saved greatly, the magnetic field stability after the excitation of the superconducting magnet is finished is ensured, and the magnetic field uniformity in a required area can more easily meet the required requirement. In addition, the glass fiber cloth can prevent the superconducting wire from being damaged due to high temperature.
The magnetic resonance superconducting coil manufactured by the method for winding the magnetic resonance superconducting coil has high reliability of fixing the superconducting wire.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a method provided by the present invention;
fig. 2 is a schematic cross-sectional view of a magnetic resonance superconducting coil obtained by applying the method provided by the invention.
Reference numerals:
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the invention is to provide a method for winding a magnetic resonance superconducting coil, which can improve the reliability of the fixation of a superconducting wire. The other core of the invention is to provide the magnetic resonance superconducting coil manufactured by the winding method of the magnetic resonance superconducting coil, and the reliability of the fixing of the superconducting wire is higher.
It will be understood that when an element is referred to as being "secured" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In an embodiment of the method for winding a superconducting magnetic resonance coil according to the present invention, please refer to fig. 1 and fig. 2, which specifically includes the following steps:
s1: a plurality of superconducting layers are sequentially arranged outside the coil framework 3. Each superconducting layer comprises a superconducting wire 1 wound on an inner structure of the superconducting wire and a plurality of layers of first glass fiber cloth 2 wrapped outside the superconducting wire 1 from inside to outside in sequence. In the superconducting layer, black glue is brushed outside the first glass fiber cloth 2 on the outermost layer.
In the magnetic resonance superconducting coil provided with at least two superconducting layers, for the innermost superconducting layer, the inner structure is a coil framework 3, namely a superconducting wire 1 is wound on the coil framework 3; for the other layer superconducting layer, the inner structure is a superconducting layer adjacent to the inside of the superconducting layer. Of course, the superconducting layer may be provided as only one layer according to actual needs.
S2: the binding-wire is wound outside the outermost superconducting layer to constitute a binding-wire layer 5. Wherein, the binding wire can be a copper wire or a stainless steel wire.
S3: and wrapping a second glass fiber cloth 6 outside the wire binding layer 5, and uniformly brushing black glue outside the second glass fiber cloth 6 for curing to obtain the magnetic resonance superconducting coil.
In the embodiment, a wet winding mode is adopted, each layer of superconducting wire 1 is wound, glass fiber cloth is wound on the surface of the superconducting wire 1, black glue is brushed, the operation is repeated until all layers of superconducting wires 1 are wound, namely, the superconducting wires 1 on different layers are fixed by paving the glass fiber cloth and brushing the black glue, compared with a vacuum grease dipping mode, gaps among the superconducting wires 1 can be filled fully, the fixing effect on the superconducting wires 1 is better, the fixing reliability among the superconducting wires 1 on different layers can be ensured, and the risk that the superconducting wires 1 generate energy due to power-on stress displacement during excitation to cause quench is reduced. Meanwhile, the superconducting wire 1 is fixed by the black glue with strong heat conductivity, heat generated in the excitation process and the use process after the excitation is finished can be timely dissipated, the risk of quench is further reduced, the cost of a large amount of liquid helium is saved, the stability of a magnetic field after the excitation of the superconducting magnet is finished is ensured, and the uniformity of the magnetic field in a required area can more easily meet the required requirements. In addition, the glass cloth can prevent the superconducting wire 1 from being damaged due to high temperature. The method is particularly applicable to cryogenic superconducting magnets. In addition, the wire-binding layer 5 and the second glass cloth 6 form a fixing layer outside the outermost superconducting layer. After each layer of superconducting layer is completely set, the superconducting wire is further bound and reinforced by using a binding wire and is fixed by using black glue again, so that the fixing effect of the superconducting wire 1 can be further improved.
Furthermore, in each superconducting layer, black glue is fully brushed outside each layer of first glass fiber cloth 2, namely, in each superconducting layer, at least two layers of first glass fiber cloth 2 can be arranged from inside to outside, and after the superconducting wire 1 is wound, the black glue is brushed once every time one layer of first glass fiber cloth 2 is wound, so that the reliability of fixing the inside of each superconducting layer is further ensured. Of course, in other embodiments, at least two first glass cloth 2 may be disposed in the superconducting layer, but no black glue is coated between adjacent first glass cloth 2, and only the outermost first glass cloth 2 in the superconducting layer is coated with black glue.
Further, winding a binding wire outside the outermost superconducting layer to form a binding wire layer 5, specifically including: and laying a perforated partition plate 4 outside the outermost superconducting layer, and then winding binding wires outside the partition plate 4 to form a binding wire layer 5. Wherein, the partition plate 4 is specifically a copper plate, and the heat dissipation effect is higher. Alternatively, the spacer 4 may be set to be 0.5mm thick.
After the superconducting layer is arranged and before the binding wire is protected, a layer of partition plate 4 with holes is laid, so that the binding force of the binding wire directly acts on the partition plate 4 instead of directly acting on the superconducting layer, the superconducting wire 1 can be effectively protected, and the superconducting wire 1 is prevented from being damaged due to the fact that the binding force is uneven. In addition, the arrangement of the through holes on the partition plate 4 is beneficial to brushing the black glue on the fixing layer, and the black glue smoothly flows into the inner side through the holes on the partition plate 4 so as to ensure the fixing effect of the fixing layer.
The invention provides a method for winding a magnetic resonance superconducting coil, which comprises the following specific application processes:
the main materials of the winding structure comprise a coil framework 3, a superconducting wire 1, black glue, glass fiber cloth, a copper plate with holes and a stainless steel wire, wherein the thickness of the copper plate is 0.5 mm.
1. Winding a layer of superconducting wire 1 on a coil framework 3 attached with a protective layer, wrapping 3 layers of glass fiber cloth on the periphery of the superconducting wire 1, and uniformly brushing black glue on the surface of each layer of glass fiber cloth to ensure that the black glue permeates and fills a gap generated by winding the superconducting wire 1 and a gap near the last turn jumping point of each layer of superconducting wire 1, thereby completing the manufacture of a superconducting layer;
2. continuing to wind the next layer of superconducting wire 1, and circularly reciprocating until the manufacturing of each superconducting layer is finished;
3. a layer of copper plate with holes with the thickness of 0.5mm is laid on the periphery of the glass fiber cloth of the superconducting layer on the outermost layer, and stainless steel wires are wound on the surface of the copper plate, so that the acting force of the stainless steel wires directly acts on the copper plate with the holes without scratching the superconducting wires 1;
4. and 3 layers of glass fiber cloth are wrapped on the surface of the stainless steel wire after the winding is finished, and black glue is uniformly brushed and cured to finish the winding of the whole superconducting coil.
In addition to the magnetic resonance superconducting coil winding method, the invention also provides a magnetic resonance superconducting coil which is manufactured by applying the magnetic resonance superconducting coil winding method provided by any one of the above embodiments, and the beneficial effects can be correspondingly referred to the above embodiments. The magnetic resonance superconducting coil is simple in structure, stable in performance and good in heat dissipation, the superconducting wire is fixed and protected obviously, the risk of quench caused by energy generated by the superconducting wire due to power-on stress displacement during excitation is reduced, and the magnetic field stability after the excitation of the superconducting magnet is completed is good. Other structures of the magnetic resonance superconducting coil can refer to the prior art, and are not described in detail herein.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The magnetic resonance superconducting coil winding method and the magnetic resonance superconducting coil provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (4)
1. A method for winding a magnetic resonance superconducting coil is characterized by comprising the following steps:
a plurality of superconducting layers are sequentially arranged outside a coil framework (3), in each superconducting layer, a superconducting wire (1) wound on an inner structure of the superconducting wire and a plurality of layers of first glass fiber cloth (2) wrapped outside the superconducting wire (1) are sequentially arranged from inside to outside, and black glue is brushed outside the first glass fiber cloth (2) on the outermost layer in the superconducting layers; winding a binding wire outside the superconducting layer on the outermost layer to form a binding wire layer (5); wrapping a second glass fiber cloth (6) outside the wire binding layer (5), and uniformly brushing black glue outside the second glass fiber cloth (6) for curing to obtain a magnetic resonance superconducting coil;
in the superconducting layer, black glue is brushed outside each layer of the first glass fiber cloth (2);
wherein the winding of the binding-wire outside the outermost layer of said superconducting layer to constitute a binding-wire layer (5) comprises: and laying a perforated partition plate (4) outside the superconducting layer on the outermost layer, and then winding the binding wires outside the partition plate (4) to form the binding wire layer (5).
2. The method of claim 1, wherein the binding wire is a copper wire or a stainless steel wire.
3. A method of winding a superconducting magnetic resonance coil according to claim 1, wherein the spacer (4) is a copper plate.
4. A superconducting magnetic resonance coil, wherein the superconducting magnetic resonance coil is manufactured by applying the winding method of the superconducting magnetic resonance coil according to any one of claims 1 to 3.
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| CN202471942U (en) * | 2012-03-13 | 2012-10-03 | 中国科学院高能物理研究所 | Magnetic resonance imaging superconducting coil |
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Denomination of invention: Magnetic resonance superconducting coil winding method and magnetic resonance superconducting coil Effective date of registration: 20210628 Granted publication date: 20200724 Pledgee: Weifang Branch of Bank of China Co.,Ltd. Pledgor: Shandong Aoxin Medical Technology Co.,Ltd. Registration number: Y2021980005423 |
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