JP2008004868A - Superconducting coil, and quenching prevention method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a superconducting coil capable of suppressing occurrence of quenching phenomena while suppressing early degradation of components. <P>SOLUTION: The superconducting coil is constituted to be excited at a very low temperature. It comprises a spool 10 including a cylindrical axis 11, and a pair of flanges 12 and 13 radially extended from both ends, in axial direction of the axis 11, a superconducting wire material 20 which is wound in coil on the outer periphery of the axis 11, and a reinforcing material 30 bridged between the flanges 12 and 13 so as to bridge outer peripheries 12b and 13b of the pair of flanges 12 and 13. The reinforcing material 30 has such thermal shrinkage coefficient that is higher than that of the superconducting wire material 20, and so shrinks as to displace the outer peripheries 12b and 13b of the pair of flanges 12 and 13 to approach each other, at a very low temperature. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a superconducting coil excited at a cryogenic temperature and a method for preventing quenching of a superconducting coil, and in particular, is configured by spirally winding a superconducting wire around a substantially cylindrical winding frame having flange portions at both axial ends. The present invention relates to a superconducting coil and a method for preventing quenching of a superconducting coil.

  Conventionally, a superconducting coil that generates a strong magnetic field spirally winds a superconducting wire around a winding frame having a cylindrical shaft portion and a flange portion extending radially outward from both axial ends of the shaft portion. And is excited by energization in a state of being cooled to a very low temperature (about 4.2 K or less).

  By the way, in a superconducting coil in an excited state, a hoop that attempts to expand a superconducting wire (in this case, a collection of superconducting wires in a wound state) in the radial direction of the superconducting coil by the interaction between an energizing current and a magnetic field generated by itself. Force acts on the superconducting wire. Thereby, since the superconducting wire is slightly displaced, there is a disadvantage that frictional heat is generated at the displaced portion and a quench phenomenon may occur.

Therefore, in order to eliminate the above inconvenience, a technique has been proposed in which the superconducting wire is made to be hard to be displaced minutely by applying a force to compress the superconducting wire in the axial direction of the superconducting coil, thereby suppressing the quench phenomenon. ing. For example, Patent Document 1 discloses that a superconducting wire is wound from a winding frame before excitation by winding the superconducting wire in a state where an axial tensile load is applied to the winding frame, and releasing the axial tensile load after winding. A superconducting coil configured to apply a sufficiently large axial compressive force is disclosed.
JP-A-5-182819

  However, in the above-mentioned Patent Document 1, in order to suppress a small displacement of the superconducting wire in the superconducting coil in an excited state, it is configured to apply a sufficiently large compressive force to the superconducting wire before excitation. A large load is always applied to the superconducting wire. As a result, there exists a problem that there exists a possibility of causing the early deterioration of a structural member.

  The present invention has been made to solve the above-described problems, and provides a superconducting coil and a method for preventing quenching of a superconducting coil capable of suppressing the occurrence of a quench phenomenon while suppressing early deterioration of components. The purpose is to do.

  In order to achieve the above object, a superconducting coil according to claim 1 of the present invention is a superconducting coil excited at a cryogenic temperature, and has a cylindrical shaft portion and a diameter from both axial ends of the shaft portion. A winding frame including a pair of flange portions extending outward, a superconducting wire spirally wound around the outer periphery of the shaft portion, and an outer peripheral edge portion of the pair of flange portions so as to bridge each other And a reinforcing material installed between the flange portions, the reinforcing material has a heat shrinkage rate larger than that of the superconducting wire, and the outside of the pair of flange portions at an extremely low temperature. The peripheral part is contracted so as to be displaced in a direction approaching each other.

  In addition, the outer periphery part of the said flange part has shown the upper surface of the outer periphery of the flange part, the lower surface or outer peripheral surface of an outer periphery.

  In the superconducting coil according to claim 1, as described above, the outer peripheral edge portions of the pair of flange portions are bridged with a reinforcing material having a thermal contraction rate larger than that of the superconducting wire, and the reinforcing material is By constructing the outer peripheral edge portions of the pair of flange portions so as to be displaced toward each other at a cryogenic temperature, the reinforcing material can be contracted more in the axial direction than the superconducting wire during cooling. Therefore, the outer peripheral edge part of a pair of flange part can mutually be adjoined so that the outer peripheral part of a corresponding superconducting wire may be pinched | interposed from an axial direction outer side. Thereby, since the compressive force by a flange part can fully be acted on the outer peripheral part of a superconducting wire, the micro displacement of the outer peripheral part of a superconducting wire can be suppressed. As a result, the occurrence of the quench phenomenon can be suppressed and the superconducting coil can be stably excited. In addition, the superconducting coil according to claim 1 has a configuration in which a compressive force of a size capable of sufficiently suppressing a minute displacement of the superconducting wire is positively acted on by a heat shrinkage difference during cooling. Thus, it is not necessary to apply a large compressive force to the winding frame and the superconducting wire from the stage before excitation, that is, the stage of transporting and installing the superconducting coil performed at room temperature. Thereby, the early deterioration of the structural member by the load of the said compressive force can be suppressed.

  In the superconducting coil according to the first aspect, preferably, the reinforcing member is provided between the flange portions in a state of being substantially unloaded in the axial direction with respect to the pair of flange portions. ). In this way, at the stage before cooling, the reinforcing material is laid between the flange portions in a state of being substantially unloaded in the axial direction with respect to the pair of flange portions, so that the winding frame and the superconducting wire are not used during cooling. Since almost no load is applied to the component, early deterioration of the constituent members can be further suppressed.

  The superconducting coil according to claim 1 or 2, wherein the reinforcing member preferably includes a cylindrical portion having an inner diameter substantially equal to an outer diameter of the flange portion, and the cylindrical portion is an outer portion of the pair of flange portions. It is constructed between the said flange parts so that a peripheral part may be bridged over a perimeter (Claim 3). If comprised in this way, the compressive force by a flange part can fully be made to act on the outer peripheral part of a superconducting wire at the time of cooling, Therefore The micro displacement of the outer peripheral part of a superconducting wire is suppressed more reliably. be able to. Thereby, generation | occurrence | production of the quench phenomenon can further be suppressed.

  In the superconducting coil according to claim 3, preferably, the reinforcing member extends radially inward from both axial ends of the cylindrical portion and sandwiches the pair of flange portions of the winding frame from both axial outer sides. A pair of reinforcing material side flange portions arranged adjacent to the flange portion, and the pair of reinforcing material side flange portions are brought into contact with the flange portions of the winding frame at a cryogenic temperature. The flange portions are contracted so as to be displaced in directions close to each other. If comprised in this way, since a comparatively wide area | region including the outer peripheral part of a pair of flange part can mutually be adjoined at the time of cooling, a flange part is made into the comparatively wide area | region including the outer peripheral part of a superconducting wire. A compressive force can be applied. Thereby, the micro displacement of a superconducting wire can be suppressed over a wide range.

  In the superconducting coil according to claim 1 or 2, preferably, the reinforcing member is a plurality of plate members, and each of the plate members partially bridges the outer peripheral edge portions of the pair of flange portions. Thus, a bridging portion constructed between the flange portions is included. Thus, if a reinforcing material is comprised with a some board | plate material, since each board | plate material can be attached to a flange part from the radial direction outer side of a winding frame, the attachment operation | work of a reinforcing material can be simplified.

  In the superconducting coil according to claim 5, preferably, each of the plate members extends radially inward from both axial ends of the bridging portion, and the pair of flange portions of the winding frame are disposed on both outer sides in the axial direction. A pair of bent portions disposed adjacent to the flange portion so as to be sandwiched between the pair of flange portions, and the pair of bent portions are brought into contact with the flange portions of the winding frame at an extremely low temperature. Are contracted so as to be displaced in directions close to each other. If comprised in this way, since a comparatively wide area | region including the outer peripheral part of a pair of flange part can mutually be adjoined at the time of cooling, a flange part is made into the comparatively wide area | region including the outer peripheral part of a superconducting wire. A compressive force can be applied. Thereby, the micro displacement of a superconducting wire can be suppressed over a wide range.

In the superconducting coil according to any one of claims 1 to 6, preferably, the superconducting wire includes a material selected from the group consisting of NbTi, Nb ₃ Sn, and Nb ₃ Al, and the reinforcing material is And a material selected from the group consisting of aluminum, aluminum alloys and stainless steel. If a superconducting wire and a reinforcing material made of such materials are used, the heat shrinkage rate of the reinforcing material can be easily made larger than the heat shrinkage rate of the superconducting wire.

  In the superconducting coil according to any one of claims 1 to 7, preferably, the reinforcing material has a thermal contraction rate equal to or higher than a thermal contraction rate of the winding frame (claim 8). If comprised in this way, since a reinforcing material can be shrink | contracted greatly in an axial direction more than a winding frame at the time of cooling, a pair of flange parts are spaced apart by the axial direction compared with an inner peripheral part. It is possible to apply a compressive force due to the flange portion to the outer peripheral portion of the superconducting wire more than the inner peripheral portion while preventing warping. Thereby, the micro displacement of the outer peripheral part of a superconducting wire can be fully suppressed.

  A quenching prevention method for a superconducting coil according to claim 9 of the present invention is a quenching prevention method for a superconducting coil excited at a cryogenic temperature, and includes a cylindrical shaft portion and a diameter from both axial ends of the shaft portion. A step of preparing a winding frame including a pair of flange portions extending outward, a step of spirally winding a superconducting wire around the outer periphery of the shaft, and a thermal contraction rate of the superconducting wire A step of preparing a reinforcing material having a heat shrinkage rate, a step of laying the reinforcing material between the flange portions so as to bridge outer peripheral edge portions of the pair of flange portions, and the reinforcing material And a step of contracting so as to displace the outer peripheral edge portions of the pair of flange portions in directions close to each other at a low temperature.

  In the method for preventing quenching of the superconducting coil according to claim 9, the outer peripheral edge portions of the pair of flange portions are bridged with a reinforcing material having a thermal contraction rate larger than that of the superconducting wire, and the reinforcing material is By contracting the outer peripheral edge portions of the pair of flange portions in a direction close to each other at a cryogenic temperature, the reinforcing material can be contracted more in the axial direction than the superconducting wire during cooling. The outer peripheral edge portions of the portions can be brought close to each other so as to sandwich the outer peripheral portion of the corresponding superconducting wire from the outside in the axial direction. Thereby, since the compressive force by a flange part can fully be acted on the outer peripheral part of a superconducting wire, the micro displacement of the outer peripheral part of a superconducting wire can be suppressed. As a result, the occurrence of the quench phenomenon can be suppressed and the superconducting coil can be stably excited. In addition, in the method for preventing quenching of the superconducting coil according to claim 9, since the compressive force that can sufficiently suppress the micro displacement of the superconducting wire is made to act positively by the difference in thermal contraction during cooling, Thus, it is not necessary to apply a large compressive force to the winding frame and the superconducting wire from the stage before excitation, that is, the stage of transport and installation of the superconducting coil, which is performed at room temperature. Thereby, the early deterioration of the structural member by the load of the said compressive force can be suppressed.

  In the method for preventing quenching of a superconducting coil according to claim 9, preferably, the step of laying the reinforcing member between the flange portions is in a state in which there is substantially no load in the axial direction with respect to the pair of flange portions. A step of laying the reinforcing material between the flange portions (claim 10); In this way, at the stage before cooling, the reinforcing material is laid between the flange portions in a state of being substantially unloaded in the axial direction with respect to the pair of flange portions, so that the winding frame and the superconducting wire are not used during cooling. Since almost no load is applied to the component, early deterioration of the constituent members can be further suppressed.

  According to the superconducting coil and the method of preventing quenching of the superconducting coil of the present invention, the reinforcing material can be contracted more in the axial direction than the superconducting wire during cooling. The outer peripheral portions of the two can be brought close to each other so as to be sandwiched from the outside in the axial direction. Thereby, since the compressive force by a flange part can fully be acted on the outer peripheral part of a superconducting wire, the micro displacement of the outer peripheral part of a superconducting wire can be suppressed. As a result, the occurrence of the quench phenomenon can be suppressed and the superconducting coil can be stably excited. Moreover, in the superconducting coil and the method for preventing quenching of the superconducting coil according to the present invention, since the compressive force capable of sufficiently suppressing the minute displacement of the superconducting wire is made to act positively by the heat shrinkage difference during cooling, Thus, it is not necessary to apply a large compressive force to the winding frame and the superconducting wire from the stage before excitation, that is, the stage of transport and installation of the superconducting coil, which is performed at room temperature. Thereby, the early deterioration of the structural member by the load of the said compressive force can be suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a front sectional view showing the overall configuration of the superconducting coil according to the first embodiment of the present invention, and FIG. 2 is a plan view of the superconducting coil shown in FIG. FIG. 3 is a front sectional view showing a state where the superconducting coil shown in FIG. 1 is cooled to a cryogenic temperature. First, with reference to FIG. 1 and FIG. 2, the whole structure of the superconducting coil by 1st Embodiment of this invention is demonstrated.

  The superconducting coil of the first embodiment is configured to be excited by energizing in a state cooled to a cryogenic temperature (about 4.2 K or less). As shown in FIG. 1, the superconducting coil includes a winding frame 10 made of an aluminum alloy and a superconducting wire 20 made of NbTi.

  The reel 10 includes a cylindrical shaft portion 11 and a pair of flange portions 12 and 13 provided so as to extend radially outward from both axial ends of the shaft portion 11. The flange portion 12 (13) includes an inner peripheral portion 12a (13a) corresponding to the inner peripheral portion of the flange portion 12 (13) and an outer peripheral portion 12b (13b) corresponding to the outer peripheral portion of the flange portion 12 (13). And is connected to the axial end of the shaft portion 11 in the inner peripheral portion 12a (13a).

  The thermal contraction rate of the reel 10 made of an aluminum alloy from room temperature to an extremely low temperature of about 4.2 K is about 0.4%. Examples of the material of the reel 10 include stainless steel other than the aluminum alloy. The thermal shrinkage rate of the reel 10 made of stainless steel from room temperature to an extremely low temperature of about 4.2 K is about 0.3%.

The superconducting wire 20 is wound around the outer periphery of the shaft portion 11 in a spiral shape (or a solenoid shape). In addition, the superconducting wire 20 of this embodiment has shown the aggregate | assembly of the superconducting wire in a winding state. The thermal contraction rate of this superconducting wire 20 from room temperature to an extremely low temperature of about 4.2 K is about 0.2 to 0.3%. As the material of the superconducting wire 20 can include a _Nb 3 Sn and _Nb 3 Al or the like other than the above NbTi.

  Here, as shown in FIGS. 1 and 2, the superconducting coil of the first embodiment further includes a reinforcing member 30 made of an aluminum alloy.

  The reinforcing member 30 includes a cylindrical portion 31 having an inner diameter substantially equal to the outer diameter of the flange portions 12 and 13. The cylindrical portion 31 is in a state of being substantially unloaded in the axial direction with respect to the pair of flange portions 12 and 13, and the outer peripheral portions 12 b and 13 b of the pair of flange portions 12 and 13, specifically the outer periphery of the flange portions 12 and 13. It spans between the flange parts 12 and 13 so that surfaces may bridge over the perimeter. That is, the reinforcing member 30 is attached to the winding frame 10 so that the distance between the pair of flange portions 12 and 13 hardly changes.

  The heat shrinkage rate of the reinforcing material 30 made of an aluminum alloy from room temperature to an extremely low temperature of about 4.2 K is about 0.4%, which is substantially equal to the heat shrinkage rate of the winding frame 10. Examples of the material of the reinforcing material 30 include aluminum other than the aluminum alloy, stainless steel, copper, copper alloy, titanium, titanium alloy, and FRP (Fiberglass Reinforced Plastics) resin.

  As a method for preventing quenching of a superconducting coil having the above-described configuration, first, an aluminum alloy including a cylindrical shaft portion 11 and a pair of flange portions 12 and 13 extending radially outward from both axial ends of the shaft portion 11. A reel 10 is prepared. Then, a superconducting wire 20 made of NbTi is wound around the outer periphery of the shaft portion 11 of the winding frame 10.

  Next, a reinforcing member 30 made of an aluminum alloy having a thermal contraction rate larger than that of the superconducting wire 20 is prepared. Then, the flange portion 12 is formed so that the outer peripheral portions 12b and 13b of the pair of flange portions 12 and 13 are bridged with each other in a state in which the reinforcing member 30 is substantially unloaded in the axial direction with respect to the pair of flange portions 12 and 13. , 13 between. Specifically, the reinforcing member 30 is attached to the reel 10 by welding the inner peripheral surfaces of both ends in the axial direction of the cylindrical portion 31 to the outer peripheral surfaces (outer peripheral portions 12 b and 13 b) of the flange portions 12 and 13. In the present embodiment, since the cylindrical portion 31 of the reinforcing member 30 is installed between the flange portions 12 and 13 in a state of being substantially unloaded in the axial direction with respect to the pair of flange portions 12 and 13, the reinforcing member 30. When attaching to the reel 10, the distance between the pair of flange portions 12 and 13 hardly changes. The reinforcing member 30 may be attached to the winding frame 10 using a fastening member such as a screw. The superconducting coil is assembled as described above.

  When the superconducting coil is cooled to a very low temperature and energized to be excited, a hoop force A acts on the superconducting wire 20 due to the interaction between the energizing current and the magnetic field generated by itself as shown in FIG. Thereby, the superconducting wire 20 swells in the radial direction.

  Moreover, when it cools to cryogenic temperature, the winding frame 10, the superconducting wire 20, and the reinforcing material 30 contract according to the thermal contraction rate of each constituent material. Here, in this embodiment, the thermal contraction rate of the reinforcing member 30 is configured to be substantially equal to the thermal contraction rate of the winding frame 10 and larger than the thermal contraction rate of the superconducting wire 20. For this reason, at the time of cooling, the winding frame 10 and the reinforcing material 30 contract more largely than the superconducting wire 20.

  And the inner peripheral parts 12a and 13a of a pair of flange parts 12 and 13 are displaced in the direction which mutually adjoins so that the superconducting wire 20 may be pinched | interposed by being pulled by the thermal contraction of the axial part 11. FIG. Further, since the reinforcing material 30 is installed between the flange portions 12 and 13 so as to bridge the outer peripheral portions 12b and 13b of the pair of flange portions 12 and 13, the outer peripheral portions of the pair of flange portions 12 and 13 When 12b and 13b are pulled by the thermal contraction of the reinforcing member 30, the superconducting wire 20 is displaced so as to be close to each other. As a result, as shown in FIG. 3, the inner peripheral portions 12 a and 13 a of the flange portions 12 and 13 are brought into contact with the inner peripheral portion of the superconducting wire 20 by the tensile force in the direction of arrow a due to the thermal contraction of the shaft portion 11 of the reel 10. While applying a sufficiently large compressive force B, the outer peripheral portions 12b and 13b of the flange portions 12 and 13 are sufficiently large on the outer peripheral portion of the superconducting wire 20 due to the tensile force in the direction of arrow a due to the thermal contraction of the reinforcing member 30. A compressive force C is applied.

  For example, in the superconducting coil that does not include the reinforcing member 30 shown in FIG. 7, the axial direction from the flange portions 112 and 113 to the superconducting wire 120 is only caused by the tensile force in the direction of arrow a due to the thermal contraction of the shaft portion 111 of the winding frame 110. Since the inner peripheral portions 112a and 113a of the flange portions 112 and 113 can apply a sufficiently large compressive force B to the superconducting wire 120, the outer periphery of the flange portions 112 and 113 can be applied. The compressive force C ′ applied to the superconducting wire 120 by the portions 112b and 113b is smaller than the compressive force B. Therefore, since the outer peripheral portions 112b and 113b of the flange portions 112 and 113 cannot apply a sufficiently large compressive force to the superconducting wire 120, the outer peripheral portions 112b and 113b of the flange portions 112 and 113 of the superconducting wire 120 are applied. It is difficult to suppress minute displacements at extremely low temperatures in the sandwiched portion.

  On the other hand, in the present embodiment, the shaft portion 11 of the winding frame 10 and the cylindrical portion 31 of the reinforcing member 30 are sufficiently contracted in the direction of arrow a at a very low temperature as described above. , 13 and the outer peripheral portions 12b, 13b can apply a sufficiently large compressive force B, C to the superconducting wire 20. Thereby, it is possible to sufficiently suppress the minute displacement of the superconducting wire 20 at a cryogenic temperature and to suppress the occurrence of the quench phenomenon.

  In addition, when the winding frame 10 made of stainless steel is used, the thermal shrinkage rate of the reinforcing member 30 is larger than the thermal shrinkage rate of the winding frame 10. If comprised in this way, since the reinforcing material 30 can be greatly shrunk in the axial direction more than the reel 10 at the time of cooling, the pair of flange portions 12 and 13 have their outer peripheral portions 12b and 13b as inner peripheral portions 12a and 12a, respectively. Compared with 13a, the compressive force by the flange parts 12 and 13 can be made to act on the outer peripheral part of the superconducting wire 20 more than an inner peripheral part, preventing it curving so that it may space apart in the axial direction. Thereby, the minute displacement of the outer peripheral part of the superconducting wire 20 can be sufficiently suppressed.

  In the first embodiment, as described above, the outer peripheral portions 12b and 13b of the pair of flange portions 12 and 13 are bridged with the reinforcing material 30 having a thermal contraction rate larger than that of the superconducting wire 20, and this reinforcement is performed. By contracting the material 30 so as to displace the outer peripheral portions 12b and 13b of the pair of flange portions 12 and 13 in a direction close to each other at a cryogenic temperature, the reinforcing material 30 is more axial than the superconducting wire 20 during cooling. Since it can shrink | contract greatly, the outer peripheral parts 12b and 13b of a pair of flange parts 12 and 13 can be mutually adjoined so that the outer peripheral part of the corresponding superconducting wire 20 may be pinched | interposed from an axial direction outer side. Thereby, since the compressive force B and C by the flange parts 12 and 13 can fully be made to act on the outer peripheral part of the superconducting wire 20, the micro displacement of the outer peripheral part of the superconducting wire 20 can be suppressed. As a result, the occurrence of the quench phenomenon can be suppressed and the superconducting coil can be stably excited. Moreover, in the superconducting coil of the first embodiment, since the compressive forces B and C having a magnitude capable of sufficiently suppressing the minute displacement of the superconducting wire 20 are positively acted on by the heat shrinkage difference during cooling, Thus, it is not necessary to apply a large compressive force to the reel 10 and the superconducting wire 20 from the stage before excitation, that is, for example, the stage of transport and installation of the superconducting coil performed at room temperature. Thereby, the early deterioration of the structural member by the load of the said compressive force can be suppressed.

  In the first embodiment, the reinforcing member 30 is installed between the flange portions 12 and 13 in a state of being substantially unloaded in the axial direction with respect to the pair of flange portions 12 and 13 in a stage before cooling. As a result, almost no load is applied to the winding frame 10 and the superconducting wire 20 except during cooling, so that early deterioration of the constituent members can be further suppressed.

  Moreover, in 1st Embodiment, as above-mentioned, the cylindrical part 31 of an internal diameter substantially equal to the outer diameter of the flange parts 12 and 13 is used for the outer peripheral parts 12b and 13b of a pair of flange parts 12 and 13 over a perimeter. By laying between the flange portions 12 and 13 so as to bridge, the compression force by the flange portions 12 and 13 can be sufficiently applied to the outer peripheral portion of the superconducting wire 20 over the entire circumference at the time of cooling. Moreover, the minute displacement of the outer peripheral portion of the superconducting wire 20 can be more reliably suppressed. Thereby, generation | occurrence | production of the quench phenomenon can further be suppressed.

(Second Embodiment)
FIG. 4 is a front sectional view showing the overall configuration of the superconducting coil according to the second embodiment of the present invention.

  As shown in FIG. 4, the superconducting coil of the second embodiment includes a reinforcing member 40 having a configuration different from that of the first embodiment. The reinforcing member 40 includes a cylindrical portion 41 having substantially the same configuration as the cylindrical portion 31 of the first embodiment, and a pair of reinforcing-material-side flange portions 42 provided so as to extend radially inward from both axial ends of the cylindrical portion 41. , 43.

  The reinforcing material side flange portions 42 and 43 are axially outside of the flange portions 12 and 13, that is, the upper surface side of the flange portion 12 and the flange portion so as to sandwich the pair of flange portions 12 and 13 of the winding frame 10 from the outside in the axial direction. It arrange | positions adjacent to the lower surface side of 13, and shrink | contracts so that a pair of flange parts 12 and 13 may be displaced to the mutually adjacent direction under cryogenic temperature.

  In the second embodiment, as described above, a pair of contractions are brought into contact with the flange portions 12 and 13 of the winding frame 10 at a cryogenic temperature so as to displace the pair of flange portions 12 and 13 in directions close to each other. By extending the reinforcing-material-side flange portions 42 and 43 radially inward from both axial ends of the cylindrical portion 41, a relatively wide area including the upper surface (outer peripheral portion 12b) of the outer peripheral edge of the flange portion 12 during cooling. And a relatively wide area including the lower surface (outer peripheral part 13 b) of the outer peripheral edge of the flange part 13, the flange part 12, and a relatively wide area including the outer peripheral part of the superconducting wire 20 can be brought close to each other. The compression force by 13 can be applied. Thereby, the micro displacement of the superconducting wire 20 can be suppressed over a wide range.

(Third embodiment)
FIG. 5 is a front sectional view showing the overall configuration of the superconducting coil according to the third embodiment of the present invention.

  As shown in FIG. 5, the superconducting coil of the third embodiment differs from the configurations of the first and second embodiments described above in that a plurality of (conventional) coils disposed at equal intervals around the reel 10 as a reinforcing material. In the embodiment, eight plate members 50 are provided. Each of the plate members 50 includes a bridging portion 51, and each bridging portion 51 has flange portions 12, 13 so as to partially bridge the outer peripheral portions 12 b, 13 b of the pair of flange portions 12, 13. It is erected between.

  In the superconducting coil having this configuration, at the time of assembly, each plate member 50 is attached to the flange portions 12 and 13 from the radially outer side of the winding frame 10 so as to bridge the outer peripheral portions 12b and 13b of the pair of flange portions 12 and 13. It becomes.

  In the third embodiment, as described above, since the plurality of plate members 50 are used as the reinforcing members, the bridging portions 51 of the respective plate members 50 can be attached to the flange portions 12 and 13 from the outside in the radial direction of the winding frame 10. Therefore, the attachment work to the flange parts 12 and 13 of a reinforcing material can be simplified.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the said 1st Embodiment, although the reinforcement material 30 was attached to the outer peripheral surface of the flange parts 12 and 13 and was shown about the example distribute | arranged to the radial direction outer side of the flange parts 12 and 13, not only this but FIG. As shown, the reinforcing member 30 is attached between the lower surface (outer peripheral portion 12b) of the outer peripheral edge of the flange portion 12 and the upper surface (outer peripheral portion 13b) of the outer peripheral edge of the flange portion 13 so as to be sandwiched between the flange portions 12 and 13. May be.

  Moreover, in the said 3rd Embodiment, although the board | plate material 50 was set as the structure which consists only of the bridging part 51, it is not restricted to this, The board | plate material 50 is provided so that it may extend in the radial direction from the axial direction both ends of the bridging part 51. It is good also as a structure further including a pair of bent part. If comprised in this way, since the comparatively wide area | region including the outer peripheral parts 12b and 13b of a pair of flange parts 12 and 13 can be mutually adjoined at the time of cooling, it is comparatively wide including the outer peripheral part of the superconducting wire 20. The compressive force by the flange parts 12 and 13 can be made to act on an area | region. Thereby, the minute displacement of the superconducting wire 20 can be suppressed over a wide range.

It is the front sectional view showing the whole superconducting coil composition by a 1st embodiment of the present invention. It is a top view of the superconducting coil shown in FIG. It is front sectional drawing which showed the state which cooled the superconducting coil shown in FIG. 1 to cryogenic temperature. It is front sectional drawing which showed the whole structure of the superconducting coil by 2nd Embodiment of this invention. It is front sectional drawing which showed the whole structure of the superconducting coil by 3rd Embodiment of this invention. It is a top view of the superconducting coil by the modification of this invention. It is front sectional drawing which showed the state which cooled the superconducting coil by a comparative example to cryogenic temperature.

Explanation of symbols

10 reel 11 shaft part 12, 13 flange part 12b, 13b outer peripheral part (outer peripheral part)
20 Superconducting wire 30, 40 Reinforcing material 31, 41 Cylindrical portion 42, 43 Reinforcing material side flange 50 Plate material (reinforcing material)
51 Bridge

Claims (10)

A superconducting coil excited at a cryogenic temperature,
A winding frame including a cylindrical shaft portion and a pair of flange portions extending radially outward from both axial ends of the shaft portion;
A superconducting wire wound spirally around the outer periphery of the shaft portion;
A reinforcing material provided between the flange portions so as to bridge the outer peripheral edge portions of the pair of flange portions;
The reinforcing material has a thermal contraction rate larger than that of the superconducting wire, and contracts so as to displace the outer peripheral edge portions of the pair of flange portions toward each other at an extremely low temperature. Superconducting coil characterized by   2. The superconducting coil according to claim 1, wherein the reinforcing member is provided between the flange portions so as to be substantially unloaded in the axial direction with respect to the pair of flange portions. The reinforcing material includes a cylindrical portion having an inner diameter substantially equal to the outer diameter of the flange portion,
3. The superconducting coil according to claim 1, wherein the cylindrical portion is constructed between the flange portions so as to bridge the outer peripheral edge portions of the pair of flange portions over the entire circumference. 4. .   The reinforcing member extends radially inward from both axial ends of the cylindrical portion and is disposed adjacent to the flange portion so as to sandwich the pair of flange portions of the winding frame from both axial outer sides. It includes a reinforcing material side flange portion, and contracts so that the pair of reinforcing material side flange portions are brought into contact with the flange portions of the winding frame and displaced in a direction approaching each other at an extremely low temperature. The superconducting coil according to claim 3. The reinforcing material is a plurality of plate materials,
The said board | plate material is respectively included in the bridge part constructed between the said flange parts so that the outer-periphery edge parts of a pair of said flange parts may be partially bridged. Superconducting coil.   Each of the plate members is disposed adjacent to the flange portion so as to extend radially inward from both axial ends of the bridging portion and sandwich the pair of flange portions of the winding frame from both outer sides in the axial direction. Including a pair of bent portions, and contracting the pair of bent portions against each flange portion of the winding frame so as to displace the pair of flange portions in directions close to each other at an extremely low temperature. The superconducting coil according to claim 5, wherein The superconducting wire includes a material selected from the group consisting of NbTi, Nb ₃ Sn and Nb ₃ Al,
The superconducting coil according to any one of claims 1 to 6, wherein the reinforcing material includes a material selected from the group consisting of aluminum, an aluminum alloy, and stainless steel.   The superconducting coil according to any one of claims 1 to 7, wherein the reinforcing material has a thermal contraction rate equal to or higher than a thermal contraction rate of the winding frame. A method for preventing quenching of a superconducting coil excited at a cryogenic temperature,
Preparing a reel including a cylindrical shaft portion and a pair of flange portions extending radially outward from both axial ends of the shaft portion;
A step of spirally winding a superconducting wire around the outer periphery of the shaft portion;
Preparing a reinforcing material having a thermal contraction rate larger than the thermal contraction rate of the superconducting wire;
Laying the reinforcing member between the flange portions so as to bridge the outer peripheral edge portions of the pair of flange portions;
A method for preventing quenching of a superconducting coil, comprising: a step of contracting the reinforcing material so as to displace outer peripheral edge portions of the pair of flange portions in a direction close to each other at a cryogenic temperature.   The step of laying the reinforcing material between the flange portions includes the step of laying the reinforcing material between the flange portions in a state of being substantially unloaded in the axial direction with respect to the pair of flange portions. The method for preventing quenching of a superconducting coil according to claim 9.

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