CN115172000A - Current lead wire of magnetic resonance superconducting magnet and assembling method thereof - Google Patents
Current lead wire of magnetic resonance superconducting magnet and assembling method thereof Download PDFInfo
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- CN115172000A CN115172000A CN202211069764.7A CN202211069764A CN115172000A CN 115172000 A CN115172000 A CN 115172000A CN 202211069764 A CN202211069764 A CN 202211069764A CN 115172000 A CN115172000 A CN 115172000A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
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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
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/3802—Manufacture or installation of magnet assemblies; Additional hardware for transportation or installation of the magnet assembly or for providing mechanical support to components of the magnet assembly
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
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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
- H01F41/10—Connecting leads to windings
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Abstract
The invention relates to the technical field of superconducting magnets, in particular to a current lead of a magnetic resonance superconducting magnet and an assembly method thereof, wherein the current lead comprises a positive conductive rod and a negative conductive tube which are arranged from inside to outside at intervals, and the outer side of the negative conductive tube is wrapped with a current lead sleeve; the lower end of the positive conducting rod is provided with a positive plug; the lower end of the negative conductive tube is provided with a negative plug, the negative plug is positioned above the positive plug, a gap is arranged between the negative plug and the positive conductive tube, and a lower spacer sleeve is arranged between the negative plug and the positive conductive rod. When the current lead is assembled, the lower end of the positive conducting rod is provided with a positive plug, and the lower end of the negative conducting tube is provided with a negative plug; and the lower spacer bush is arranged between the positive electrode conducting rod and the negative electrode conducting pipe sleeve by using an epoxy resin adhesive and is fixed by using a fixing tool, so that the cured positive electrode plug and the cured negative electrode plug are coaxial. The current lead has the advantages of simple structure, convenient plugging, good coaxiality of the anode plug and the cathode plug, small contact resistance during use, small heat emission, long service life and the like.
Description
Technical Field
The invention relates to a current lead of a magnetic resonance superconducting magnet and an assembly method thereof, belonging to the technical field of superconducting magnets.
Background
The excitation of the magnetic resonance superconducting magnet is an important link in the process of verifying the magnetic resonance superconducting magnet, and the current lead plays an important role in the excitation process of the magnetic resonance superconducting magnet. The current lead of the existing magnetic resonance superconducting magnet is connected and matched with a positive socket and a negative socket of the superconducting magnet respectively, and the upper end of the current lead of the magnetic resonance superconducting magnet is connected with external excitation equipment. The current lead is an important link for connecting an external excitation device with a superconducting coil inside the superconducting magnet in the excitation process, wherein the coaxiality of the current lead of the magnetic resonance superconducting magnet is guaranteed to be important.
The influence of the coaxiality of the current lead of the magnetic resonance superconducting magnet on the excitation of the magnetic resonance superconducting magnet is mainly 4, and (1) the larger coaxiality deviation can cause the contact surfaces of the positive plug and the negative plug of the current lead of the magnetic resonance superconducting magnet and the positive socket and the negative socket of the superconducting magnet to be uneven, so that the contact area is reduced, the contact resistance is increased, the very large heat can be generated in the excitation process to cause the volatilization of a large amount of ultralow-temperature liquid helium in the magnetic resonance superconducting magnet, and even the magnet quench is caused to cause the volatilization of a large amount of liquid helium to generate serious economic loss. (2) The current lead of the magnetic resonance superconducting magnet cannot be well plugged and unplugged due to large coaxiality deviation, and the current lead and the current plug of the cathode of the magnetic resonance superconducting magnet and the sockets of the cathode and the anode of the superconducting magnet are seriously abraded, so that the sockets of the cathode and the anode of the magnetic resonance superconducting magnet are damaged, and huge economic loss can be generated by repairing and replacing the sockets of the cathode and the anode of the magnetic resonance superconducting magnet. (3) When the current lead of the magnetic resonance superconducting magnet is plugged into or pulled out of the magnetic resonance superconducting magnet, the large coaxiality deviation can vibrate the magnetic resonance superconducting magnet, and the magnetic resonance superconducting magnet is easy to quench. (4) The large coaxiality deviation easily causes that the current leads of the magnetic resonance superconducting magnet are inserted into the positive and negative sockets of the magnetic resonance superconducting magnet, and the current leads of the magnetic resonance superconducting magnet cannot be inserted and pulled out to excite the magnetic resonance superconducting magnet.
In the current lead of the magnetic resonance superconducting magnet, the coaxiality of the positive plug and the negative plug of the current lead of the magnetic resonance superconducting magnet is ensured by adopting the self assembly gap in the assembly process, and the coaxiality cannot be accurately ensured. Because each unit part of the current lead of the magnetic resonance superconducting magnet is made of different materials, the current lead cannot be welded completely, wherein the connection of key components needs to be cured by filling high-strength epoxy resin adhesive, and the coaxiality of the current lead cannot be ensured because the epoxy resin adhesive can generate clearance offset in the curing process.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a current lead of a magnetic resonance superconducting magnet and an assembling method thereof, wherein the current lead has the advantages of simple structure, convenient plugging, good coaxiality of a positive plug and a negative plug of the current lead, small contact resistance during use, small heat generation, long service life and the like.
In order to solve the above problems, the technical scheme adopted by the invention is as follows:
a current lead of a magnetic resonance superconducting magnet comprises a positive conductive rod and a negative conductive tube arranged outside the positive conductive rod, wherein a gap is formed between the positive conductive rod and the negative conductive tube; the lower end of the positive conductive rod extends out of the negative conductive tube, and the lower end of the positive conductive rod is provided with a positive plug; the lower end of the negative conductive tube is provided with a negative plug which is positioned above the positive plug, and a lower spacer bush is arranged between the negative plug and the positive conductive rod.
As an improvement, the upper end of the positive electrode conducting rod extends out of the negative electrode conducting tube, the upper end of the negative electrode conducting tube is provided with an upper spacer bush, and the upper spacer bush is arranged between the positive electrode conducting rod and the negative electrode conducting tube.
As an improvement, the positive plug is of a cylindrical structure, the end part of the positive plug is provided with a mounting hole, and the lower end of the positive conducting rod is mounted in the mounting hole; the negative plug is of a cylindrical structure; the positive plug and the negative plug are arranged in a shaft mode.
As an improvement, the device also comprises a junction box, wherein the upper end of the positive conducting rod and the upper end of the negative conducting tube are fixedly arranged in the junction box; the junction box is provided with a positive terminal and a negative terminal which are arranged at intervals; the positive terminal is connected with the upper end of the positive conducting rod through a positive connecting plate; the negative terminal is connected with the negative conductive tube through the negative connecting plate.
As an improvement, the upper end and the lower end of the negative conductive tube are respectively provided with a through hole, and the gap is communicated with the external environment of the current lead through the through holes.
A current lead assembly method of a magnetic resonance superconducting magnet comprises the following steps:
s1, mounting the lower end of a positive electrode conducting rod in a mounting hole of a positive electrode plug, and welding the positive electrode conducting rod and the positive electrode plug together by brazing; installing a negative plug at the lower end of the negative conductive tube, and welding the negative plug and the negative conductive tube together by brazing;
s2, sleeving a lower spacer bush on the positive conducting rod, and bonding the inner surface of the lower spacer bush and the outer surface of the positive conducting rod through an epoxy resin adhesive; sleeving the cathode conductive tube on a lower spacer sleeve, and bonding the outer surface of the lower spacer sleeve and the inner surface of the cathode conductive tube through an epoxy resin adhesive; sleeving a current lead sleeve on a negative conductive tube, and adhering the outer surface of the negative conductive tube and the inner surface of the current lead sleeve by smearing an epoxy resin adhesive;
and S3, fixing the assembly obtained in the S2 by using a fixing tool, enabling the positive plug and the negative plug to be coaxial, and removing the fixing tool after the epoxy resin adhesive is cured.
As an improvement, the fixing tool comprises two fixing blocks which are detachably fixed together, and a stepped hole-shaped fixing area is arranged between the two fixing blocks; the fixing area sequentially comprises a sleeve fixing part, a cathode fixing part and an anode fixing part from top to bottom; the sleeve fixing part, the cathode fixing part and the anode fixing part are arranged concentrically.
As an improvement, the fixing tool is provided with a positioning groove, the positioning groove extends from one fixing block to the other fixing block, and a positioning block is installed in the positioning groove.
As an improvement, two all be equipped with connecting portion on the fixed block, be equipped with the connecting hole on the connecting portion.
As an improvement, the method further comprises the following steps:
s4, installing an upper spacer bush between the positive electrode conducting rod and the negative electrode conducting tube, and fixing the upper spacer bush and the positive electrode conducting rod and the negative electrode conducting tube by smearing epoxy resin adhesives;
s5, mounting a positive electrode connecting plate and a positive electrode binding post at the top end of the positive electrode conducting rod, and welding the positive electrode conducting rod and the positive electrode connecting plate through brazing; the positive connecting plate is welded with the positive binding post through brazing; fixing the insulating support column at the lower end of the positive terminal through an epoxy resin adhesive;
a negative electrode connecting plate and a negative electrode binding post are arranged at the top end of the negative electrode conductive tube, and the negative electrode conductive tube and the negative electrode connecting plate are welded through brazing; the negative electrode connecting plate and the negative electrode binding post are welded through brazing; fixing an insulating support column at the lower end of the negative terminal through an epoxy resin adhesive;
and S6, mounting a junction box.
By adopting the technical scheme, compared with the prior art, the invention has the following advantages:
the current lead of the magnetic resonance superconducting magnet and the assembling method thereof have the advantages of simple structure, convenient manufacture and assembly and convenient plugging and unplugging. In the current lead manufacturing process, the coaxiality among a plurality of parts is ensured, so that the coaxiality of the positive plug and the negative plug is greatly improved after the current lead is manufactured. In the magnetic resonance superconducting magnet excitation process, the contact surfaces of the positive plug and the negative plug of the current lead and the positive socket and the negative socket of the magnetic resonance superconducting magnet become uniform, so that the contact resistance is reduced to the lowest value, the volatilization amount of liquid helium is reduced, and the risk of quench of the magnetic resonance superconducting magnet is reduced. The good coaxiality greatly reduces the abrasion of the positive plug and the negative plug of the current lead and the positive socket and the negative socket of the magnetic resonance superconducting magnet, greatly prolongs the service life of the positive plug and the negative plug of the current lead and the service life of the positive socket and the negative socket of the magnetic resonance superconducting magnet, and can effectively avoid the phenomenon of incapability of excitation caused by the structure or the manufacturing error of the current lead.
The present invention will be described in detail below with reference to the drawings and examples.
Drawings
FIG. 1 is a schematic diagram of the current lead of a magnetic resonance superconducting magnet of the present invention;
FIG. 2 isbase:Sub>A cross-sectional view A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is a bottom view of FIG. 1;
FIG. 5 is an enlarged view at E in FIG. 3;
FIG. 6 is an enlarged view at F in FIG. 3;
FIG. 7 is an enlarged view at M in FIG. 2;
FIG. 8 is a schematic structural view of a fixture used in current lead assembly;
FIG. 9 is a top view of FIG. 8;
FIG. 10 is a use reference view of a current lead assembly using a fixture;
in the figure, 1-a positive electrode conducting rod, 2-a negative electrode conducting tube, 3-a gap, 4-a positive electrode plug, 5-a negative electrode plug, 6-a lower spacer, 7-an upper spacer, 8-a current lead sleeve, 9-a junction box, 10-a positive electrode terminal, 11-a negative electrode terminal, 12-a positive electrode connecting plate, 13-a negative electrode connecting plate, 14-an insulating sleeve, 15-an insulating support column, 16-a flange opening, 17-a through hole, 18-a first positioning step, 19-a second positioning step, 20-an insulating flange, 40-a fixing tool, 41-a fixing block, 42-a sleeve fixing part, 43-a negative electrode fixing part, 44-a positive electrode fixing part, 45-a connecting part, 46-a connecting hole, 47-a positioning groove and 48-a positioning block.
Detailed Description
Example one
As shown in fig. 1, 2, 3, 4, 5, 6, and 7, a current lead of a magnetic resonance superconducting magnet includes a positive electrode conductive rod 1 and a negative electrode conductive tube 2 disposed outside the positive electrode conductive rod 1, and a gap 3 is provided between the positive electrode conductive rod 1 and the negative electrode conductive tube 2.
As shown in fig. 6, the positive electrode conducting rod 1 is sleeved with a lower spacer 6, a negative electrode plug 5 and a negative electrode conducting tube 2 from inside to outside in sequence, and a distance is provided between the negative electrode plug 5 and the positive electrode plug 4. The lower end of the positive conducting rod 1 extends out of the negative conducting tube 2, and the lower end of the positive conducting rod 1 is provided with a positive plug 4. The positive plug 4 is a cylindrical structure, the upper end of the positive plug 4 is provided with a mounting hole, and the lower end of the positive conducting rod 1 is mounted in the mounting hole.
The lower end of the negative conductive tube 2 is provided with a negative plug 5, the negative conductive tube 2 and the negative plug 5 are fixed by brazing, the negative plug 5 is positioned above the positive plug 4, and a lower spacer 6 is arranged between the negative plug 5 and the positive conductive rod 1. The lower spacer 6 is an insulating spacer and is used for fixing and insulating the negative plug 5 and the positive conducting rod 1. The lower spacer 6 is of a cylindrical structure, a first positioning step 18 is arranged on the outer circumference of the lower spacer 6, the upper part of the first positioning step 18 is matched with the inner diameter of the negative plug 5, and the negative plug 5 is sleeved on the outer side of the first positioning step 18. The outer diameter of the portion above the first positioning step 18 is smaller than the outer diameter of the portion below the first positioning step 18.
In the present embodiment, the negative electrode plug 5 is preferably a cylindrical structure, and the upper end of the negative electrode plug 5 is attached to the inside of the lower end of the negative electrode conductive tube 2. The outer side surface of the negative plug 5 is provided with a second positioning step 19. The outer side surface below the second positioning step 19 of the negative plug 5 is a contact surface matching with the negative socket. The positive plug 4 is arranged coaxially with the negative plug 5. The positive electrode conducting rod 1 and the negative electrode conducting tube 2 are both made of pure copper T2 materials. The positive electrode plug 4 and the negative electrode plug 5 are made of brass H62 material and have silver-plated surface layers in order to ensure good conductivity and strength.
As shown in fig. 5, 6 and 7, the current lead sleeve 8 is fitted around the negative electrode conductive tube 2. The current lead sleeve 8 is made of an insulating material. The upper end of the positive conductive rod 1 extends out of the negative conductive tube 2, the upper spacer 7 is mounted at the upper end of the negative conductive tube 2, and the upper spacer 7 is arranged between the positive conductive rod 1 and the negative conductive tube 2. The upper end and the lower end of the negative conductive tube 2 are both provided with through holes 17, and the gap 3 is communicated with the external environment of the current lead through the through holes 17. The current lead sleeve 8 is therefore also provided with a through-opening at a position corresponding to the through-opening 17.
The lower spacer 6, the upper spacer 7 and the current lead bushing 8 are made of FR4 epoxy material in this example to ensure good strength and insulation.
As shown in fig. 5 and fig. 7, the current lead further includes a junction box 9, and the upper end of the positive electrode conductive rod 1 and the upper end of the negative electrode conductive tube 2 are both fixedly mounted in the junction box 9. The junction box 9 is provided with a positive terminal 10 and a negative terminal 11 which are arranged at intervals. The positive terminal 10 is connected with the upper end of the positive conducting rod 1 through a positive connecting plate 12; the negative terminal 11 is connected to the negative conductive tube 2 through a negative connection plate 13. Specifically, brazing is adopted between the positive terminal 10 and the positive connecting plate 12, and between the positive connecting plate 12 and the positive conducting rod 1; brazing is adopted between the negative terminal 11 and the negative connecting plate 13 and between the negative connecting plate 13 and the negative conductive tube 2.
The junction box 9 is provided with a flange opening 16. The positive terminal 10 and the negative terminal 11 are both mounted on the top plate of the junction box 9, and the insulating sleeves 14 are respectively arranged between the positive terminal 10 and the top plate of the junction box 9 and between the negative terminal 11 and the top plate of the junction box 9. Two insulating support columns 15 are arranged in the junction box 9, and the positive terminal 10 and the negative terminal 11 are respectively supported by the two insulating support columns 15 from the lower part.
The upper end of the negative conductive tube 2 is sleeved with an insulating flange 20, the insulating flange 20 is fixed on the bottom plate of the junction box 9, the flange of the insulating flange 20 is positioned at the lower side of the bottom plate of the junction box 9, and the insulating flange and the flange are fixedly connected through a fastener, such as bolt and nut connection or screw fastening connection. The insulating flange 20 is also provided with through holes at positions corresponding to the through holes 17. When the current lead is used for magnetic resonance superconducting magnet excitation, the negative plug 5 and the positive plug 4 of the current lead generate heat to cause liquid helium to be heated and volatilized, the volatilized helium enters the gap 3 through the through hole 17 at the lower end of the negative conductive tube 2, then goes upwards to enter the junction box 9 through the through hole 17 at the upper end of the negative conductive tube 2, and finally the helium is discharged out of the magnet through the flange port 16 to maintain the balance of the internal pressure and the external pressure of the installed magnet.
Example two
In an embodiment, a method for assembling a current lead of a magnetic resonance superconducting magnet includes the following steps:
s1, mounting the lower end of the positive conductive rod 1 in a mounting hole of a positive plug 4, and welding the positive conductive rod and the positive plug together by brazing. The negative plug 5 is mounted on the lower end of the negative conductive tube 2, and the two are welded together by brazing.
And S2, sleeving the lower spacer bush 6 on the positive conducting rod 1, and bonding the inner surface of the lower spacer bush 6 and the outer surface of the positive conducting rod 1 through a high-strength epoxy resin adhesive. The cathode conductive tube 2 is sleeved on the lower spacer bush 6, and the outer surface of the lower spacer bush 6 is bonded with the inner surface of the cathode conductive tube 2 through a high-strength epoxy resin adhesive. And sleeving the current lead sleeve 8 on the negative conductive tube 2, and adhering the outer surface of the negative conductive tube 2 and the inner surface of the current lead sleeve by smearing high-strength epoxy resin adhesive.
And S3, fixing the assembly obtained in the S2 by using a fixing tool 40, enabling the positive plug 4 and the negative plug 5 to be coaxial, and removing the fixing tool 40 after curing the high-strength epoxy resin adhesive.
And S4, an upper spacer 7 is arranged between the positive conducting rod 1 and the negative conducting tube 2, and the upper spacer 7, the positive conducting rod 1 and the negative conducting tube 2 are fixed by smearing high-strength epoxy resin adhesive.
S5, mounting a positive electrode connecting plate 12 and a positive electrode binding post 10 at the top end of the positive electrode conducting rod 1, and welding the positive electrode conducting rod 1 and the positive electrode connecting plate 12 through brazing; the positive connecting plate 12 is welded with the positive binding post 10 through brazing; fixing the insulating support column 15 at the lower end of the positive terminal 10 by using a high-strength epoxy resin adhesive; a negative electrode connecting plate 13 and a negative electrode binding post 11 are arranged at the top end of the negative electrode conductive tube 2, and the negative electrode conductive tube 2 and the negative electrode connecting plate 13 are welded through brazing; the negative electrode connecting plate 13 and the negative electrode binding post 11 are welded through brazing; the insulating support post 15 is fixed to the lower end of the negative terminal 11 by a high-strength epoxy adhesive.
And S6, installing the junction box 9.
In S1 and S2, the contact surfaces are all fixed by filling with a high-strength epoxy resin adhesive, and the curing time of the high-strength epoxy resin adhesive is relatively long, and is usually 24 hours or more. In order to ensure the coaxiality among the main components of the current lead, namely the positive plug 4, the negative plug 5, the lower spacer bush 6 and the current lead sleeve 8, the current lead is fixed by using a fixing tool 40 in S3; and after the epoxy resin adhesive is cured, the fixing tool 40 is removed.
As shown in fig. 8, 9 and 10, the fixing tool 40 in S3 includes two fixing blocks 41 detachably fixed together, and a fixing area in a stepped hole shape is provided between the two fixing blocks 41. The fixing area comprises a sleeve fixing part 42, a negative electrode fixing part 43 and a positive electrode fixing part 44 from top to bottom in sequence; the sleeve fixing portion 42, the negative electrode fixing portion 43, and the positive electrode fixing portion 44 are concentrically arranged. The fixing tool 40 is provided with a positioning groove 47 on the outside, the positioning groove 47 extends from one fixing block 41 to the other fixing block 41, and a positioning block 48 is installed in the positioning groove 47. Connecting portions 45 are arranged on the two fixing blocks 41, and connecting holes 46 are formed in the connecting portions 45. When the assembly obtained in S2 is fixed by using the fixing tool 40, a fastener is installed in the connecting hole 46 to fix the two fixing blocks together. Under the action of the fixing tool 40, the positive plug 4 and the negative plug 5 are kept coaxial. And (3) after the high-strength epoxy resin adhesive is cured, the fixing tool 40 is removed, and the positive plug 4 and the negative plug 5 in the obtained assembly can keep coaxial and are accurately positioned.
Because the epoxy resin adhesive filled in the gaps of the contact surfaces of the current lead can easily flow to the outer surfaces of the parts and the inner surface of the fixing tool 40, and cannot be detached after curing, a film with certain extrusion resistance strength needs to be attached to the inner surface of the fixing tool 40. In this embodiment, preferably, a 0.1mm thick film made of FR4 epoxy is used to isolate the inner surface of the fixing tool 40 from the outer side surfaces of the positive plug 4, the negative plug 5, the lower spacer 6 and the current lead bushing 8 of the current lead, so as to facilitate the use and maintenance of the fixing tool 40.
The current lead of the magnetic resonance superconducting magnet and the assembling method thereof have the advantages of simple structure, convenient manufacture and assembly and convenient plugging and unplugging. In the current lead manufacturing process, the coaxiality among a plurality of components is guaranteed, and the coaxiality after the current lead is manufactured is greatly improved. In the magnetic resonance superconducting magnet excitation process, the contact surfaces of the positive plug 4 and the negative plug 5 of the current lead and the positive socket and the negative socket of the magnetic resonance superconducting magnet become uniform, so that the contact resistance is reduced to the lowest value, the volatilization amount of liquid helium is reduced, and the risk of quenching of the magnetic resonance superconducting magnet is reduced. The good coaxiality greatly reduces the abrasion of the positive plug 4 and the negative plug 5 of the current lead and the positive socket and the negative socket of the magnetic resonance superconducting magnet, greatly prolongs the service life of the positive plug 4 and the negative plug 5 of the current lead and the positive socket and the negative socket of the magnetic resonance superconducting magnet, and can effectively avoid the phenomenon of incapability of excitation caused by the structure or the manufacturing error of the current lead.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A current lead of a magnetic resonance superconducting magnet comprises a positive pole conducting rod (1), and is characterized in that: the cathode conducting tube (2) is arranged on the outer side of the cathode conducting rod (1), and a gap (3) is formed between the cathode conducting tube (2) and the cathode conducting rod (1); the lower end of the positive conductive rod (1) extends out of the negative conductive tube (2), and the lower end of the positive conductive rod (1) is provided with a positive plug (4); the lower end of the negative conductive tube (2) is provided with a negative plug (5), the negative plug (5) is positioned above the positive plug (4), and a lower spacer sleeve (6) is arranged between the negative plug (5) and the positive conductive rod (1).
2. A current lead for a magnetic resonance superconducting magnet according to claim 1, wherein: the upper end of the positive conducting rod (1) extends out of the negative conducting tube (2), the upper end of the negative conducting tube (2) is provided with an upper spacer sleeve (7), and the upper spacer sleeve (7) is arranged between the positive conducting rod (1) and the negative conducting tube (2).
3. A current lead for a magnetic resonance superconducting magnet according to claim 1, wherein: the positive plug (4) is of a cylindrical structure, the end part of the positive plug (4) is provided with a mounting hole, and the lower end of the positive conducting rod (1) is mounted in the mounting hole; the negative plug (5) is of a cylindrical structure; the positive plug (4) and the negative plug (5) are coaxially arranged.
4. A current lead for a magnetic resonance superconducting magnet according to any one of claims 1 to 3, wherein: the device also comprises a junction box (9), wherein the upper end of the positive conducting rod (1) and the upper end of the negative conducting tube (2) are fixedly arranged in the junction box (9); the junction box (9) is provided with a positive terminal (10) and a negative terminal (11) which are arranged at intervals; the positive terminal (10) is connected with the upper end of the positive conducting rod (1) through a positive connecting plate (12); the negative terminal (11) is connected with the negative conductive tube (2) through a negative connecting plate (13).
5. A current lead for a magnetic resonance superconducting magnet according to any one of claims 1 to 3, wherein: the upper end and the lower end of the negative conductive tube (2) are provided with through holes (17), and the gap (3) is communicated with the external environment of the current lead through the through holes (17).
6. A method for assembling a current lead of a magnetic resonance superconducting magnet is characterized by comprising the following steps:
s1, mounting the lower end of a positive conductive rod (1) in a mounting hole of a positive plug (4), and welding the positive conductive rod and the positive plug together by brazing; installing a negative plug (5) at the lower end of the negative conductive tube (2), and welding the negative plug and the negative conductive tube together by brazing;
s2, sleeving a lower spacer bush (6) on the positive conducting rod (1), and bonding the inner surface of the lower spacer bush (6) and the outer surface of the positive conducting rod (1) through an epoxy resin adhesive;
sleeving the negative conductive tube (2) on the lower spacer bush (6), and bonding the outer surface of the lower spacer bush (6) with the inner surface of the negative conductive tube (2) through an epoxy resin adhesive;
sleeving a current lead sleeve (8) on the negative conductive tube (2), and adhering the outer surface of the negative conductive tube (2) and the inner surface of the current lead sleeve by smearing an epoxy resin adhesive;
and S3, fixing the assembly obtained in the S2 by using a fixing tool (40) to enable the positive plug (4) and the negative plug (5) to be coaxial, and removing the fixing tool (40) after the epoxy resin adhesive is cured.
7. A method of assembling current leads for a magnetic resonance superconducting magnet according to claim 6, wherein: the fixing tool (40) comprises two fixing blocks (41) which are detachably fixed together, and a stepped hole-shaped fixing area is arranged between the two fixing blocks (41); the fixing area comprises a sleeve fixing part (42), a negative electrode fixing part (43) and a positive electrode fixing part (44) from top to bottom in sequence; the sleeve fixing part (42), the negative electrode fixing part (43) and the positive electrode fixing part (44) are concentrically arranged.
8. A method of assembling current leads for a magnetic resonance superconducting magnet according to claim 7, wherein: be equipped with constant head tank (47) on fixed frock (40), on constant head tank (47) extended to another fixed block (41) from a fixed block (41), install locating piece (48) in constant head tank (47).
9. A method of assembling current leads for a magnetic resonance superconducting magnet according to claim 7, wherein: two all be equipped with connecting portion (45) on fixed block (41), be equipped with connecting hole (46) on connecting portion (45).
10. A method of assembling current leads for a magnetic resonance superconducting magnet according to claim 6, wherein: further comprising the steps of:
s4, an upper spacer bush (7) is arranged between the positive conductive rod (1) and the negative conductive tube (2), and the upper spacer bush (7) is fixed with the positive conductive rod (1) and the negative conductive tube (2) by coating epoxy resin adhesive;
s5, mounting a positive connecting plate (12) and a positive binding post (10) at the top end of the positive conducting rod (1), and welding the positive conducting rod (1) and the positive connecting plate (12) through brazing; the positive connecting plate (12) is welded with the positive binding post (10) through brazing; fixing an insulating support column (15) at the lower end of the positive terminal (10) through an epoxy resin adhesive;
a negative electrode connecting plate (13) and a negative electrode binding post (11) are arranged at the top end of the negative electrode conductive tube (2), and the negative electrode conductive tube (2) and the negative electrode connecting plate (13) are welded through brazing; the negative electrode connecting plate (13) is welded with the negative electrode binding post (11) through brazing; an insulating support column (15) is fixed at the lower end of the negative terminal (11) through epoxy resin adhesive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211069764.7A CN115172000B (en) | 2022-09-02 | 2022-09-02 | Current lead wire of magnetic resonance superconducting magnet and assembling method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211069764.7A CN115172000B (en) | 2022-09-02 | 2022-09-02 | Current lead wire of magnetic resonance superconducting magnet and assembling method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115172000A true CN115172000A (en) | 2022-10-11 |
| CN115172000B CN115172000B (en) | 2022-11-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116705450A (en) * | 2023-07-31 | 2023-09-05 | 山东奥新医疗科技有限公司 | Current lead dismounting device for superconducting magnet |
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| CN2131207Y (en) * | 1992-06-09 | 1993-04-28 | 中国科健有限公司 | Coaxial drawable gas-cooling current conductor for superconductive magnets |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116705450A (en) * | 2023-07-31 | 2023-09-05 | 山东奥新医疗科技有限公司 | Current lead dismounting device for superconducting magnet |
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