Winding framework for manufacturing superconducting coil and superconducting coil

Abstract

The invention discloses a winding framework for manufacturing a superconducting coil and the superconducting coil, and the winding framework comprises a superconducting strip groove which is formed in the first surface of the winding framework and is used for accommodating at least one stacked superconducting strip; the at least one cold conduction groove is formed in the second surface of the winding framework, corresponds to the superconducting tape groove and is used for providing refrigeration for the superconducting tape in the superconducting tape groove, or is used for forming a cold conduction runner when at least two winding frameworks are stacked so as to provide refrigeration for the superconducting tape in the superconducting tape groove of the adjacent winding framework; and the superconducting connecting joints are fixedly connected to the two ends of the superconducting strip groove and are used for electrically connecting the superconducting strips on the at least two winding frameworks when the at least two winding frameworks are stacked. The winding framework has better restraining and protecting effects on the superconducting tape, extra insulation treatment is not needed before the superconducting tape is wound, the superconducting tape can be directly refrigerated, a cold conduction path is more convenient to form, and a superconducting connector is easier to manufacture.

Description

Technical Field

[0001] The present invention belongs to the field of superconducting magnets, and particularly relates to a winding skeleton and a superconducting coil for manufacturing a superconducting coil. Background Art

[0002] Currently, the following problems generally exist in the domestic manufacturing of superconducting coils: First, when winding, the superconducting tape is wound around the outer cylindrical surface of a winding skeleton (usually a metal ring) with a certain winding tension. The protection and constraint of the superconducting tape are insufficient, and the superconducting tape is prone to falling off the winding skeleton under the action of electromagnetic force or other external forces.

[0003] Second, surface insulation treatment needs to be carried out before winding the superconducting tape around the winding skeleton to prevent inter-turn conduction after winding, thereby affecting the total ampere-turns of the final superconducting magnet. Usually, surface insulation treatment is carried out by semi-overlapping wrapping with Kapton tape, and insulation damage is likely to occur during the subsequent tension winding of the superconducting tape.

[0004] Third, superconducting coils are usually cooled by being immersed in liquid helium as a whole, or by fully contacting the winding skeleton through a pipeline for transporting liquid helium for cooling. The winding skeleton then indirectly cools the superconducting tape wound around it. The overall immersion cooling requires a large amount of liquid helium, and the pipeline contact cooling affects the cooling efficiency due to the limited heat conduction coefficient.

[0005] Finally, usually when making joints, the superconducting tape is led out and lengthened, and a superconducting connection joint is made separately outside the winding skeleton. However, such a separately made superconducting connection joint still requires a separate fixing structure for fixing, and is easily damaged by electromagnetic force. Summary of the Invention

[0006] To solve the foregoing technical problems, the present invention provides a winding skeleton for manufacturing a superconducting coil, including: A superconducting tape groove, arranged on the first surface of the winding skeleton, for accommodating at least one stacked superconducting tape; At least one cooling channel, arranged on the second surface of the winding skeleton opposite to the first surface, corresponding to the superconducting tape groove, for providing cooling to the superconducting tape in the superconducting tape groove, or for forming a cooling flow channel when at least two winding skeletons are stacked to provide cooling to the superconducting tape in the superconducting tape grooves of adjacent winding skeletons; A superconducting connection joint, fixedly connected to both ends of the superconducting tape groove, for electrically connecting the superconducting tapes on at least two winding skeletons when at least two winding skeletons are stacked.

[0007] Further, the superconducting tape groove is a spiral superconducting tape groove.

[0008] Further, the superconducting connection joint includes: an inner joint electrically connected to the inner turn of the superconducting tape; an outer joint electrically connected to the outer turn of the superconducting tape.

[0009] Further, the winding skeleton (denoted as the first winding skeleton) further includes: A connecting mechanism, which includes: a first set of connecting holes arranged in an array, adjacent to the outer turn of the superconducting tape; a second set of connecting holes arranged in an array, adjacent to the inner turn of the superconducting tape.

[0010] Further, the winding skeleton (denoted as the second winding skeleton) further includes: A connecting mechanism, which includes: a first set of connecting holes arranged in an array, adjacent to the inner turn of the superconducting tape; a second set of connecting holes arranged in an array, adjacent to the outer turn of the superconducting tape.

[0011] Further, the first connecting hole is a threaded hole, and the second connecting hole is a countersunk hole.

[0012] The present invention also provides a superconducting coil with a large number of coil turns, including: a plurality of first winding skeletons and a plurality of second winding skeletons alternately stacked and installed along the stacking direction, Wherein, Insulating sheets and conductive sheets are alternately arranged between the contact surfaces of the outer joints of the plurality of first winding skeletons and the plurality of second winding skeletons, and conductive sheets and insulating sheets are alternately arranged between the contact surfaces of the inner joints of the plurality of first winding skeletons and the plurality of second winding skeletons.

[0013] Further, the insulating sheet is an epoxy gasket.

[0014] Further, the conductive sheet is a pure indium sheet.

[0015] Further, the thicknesses of both the conductive sheet and the insulating sheet are 0.1 mm.

[0016] Compared with the prior art, for the winding skeleton for manufacturing a superconducting coil provided by the present invention, placing the superconducting tape in the superconducting tape groove provides better restraint, fixation, and protection effects on the superconducting tape; the superconducting tape does not need to be wound with tension, and there is a winding skeleton body structure between turns, and its inter-turn resistance is larger than when the superconducting tapes are in direct contact, so no additional insulation treatment is required for the superconducting tape before winding; the self-provided liquid helium cooling channels can transport liquid helium to directly cool the superconducting tape, and a cooling path can be conveniently formed by stacking the winding skeletons; the two ends of the superconducting tape are directly made into superconducting connection joints and are directly fixed through the integral structure with the winding skeleton, making it easier to manufacture the superconducting connection joints. Description of the Drawings

[0017] Figure 1 Shows a schematic structural diagram of the superconducting tape groove in the winding skeleton according to an embodiment of the present invention; Figure 2 Shows a schematic structural diagram of a heat conduction groove in a winding skeleton according to an embodiment of the present invention; Figure 3 Shows a schematic structural diagram of a superconducting connection joint in a winding skeleton according to an embodiment of the present invention; Figure 4 Shows a schematic structural diagram of inner turns and outer turns in a winding skeleton according to an embodiment of the present invention; Figure 5 Shows a schematic structural diagram of a connection mechanism in a first winding skeleton according to an embodiment of the present invention; Figure 6 Shows a schematic structural diagram of a connection mechanism in a second winding skeleton according to an embodiment of the present invention; Figure 7 Shows a schematic structural diagram when the first winding skeleton and the second winding skeleton according to an embodiment of the present invention are stacked; Figure 8 Shows a schematic structural diagram of a second winding skeleton according to an embodiment of the present invention; Figure 9 Shows a schematic structural diagram of a first winding skeleton according to an embodiment of the present invention; Figure 10 Shows a schematic electrical connection structure diagram of stacked winding skeletons in a superconducting coil according to an embodiment of the present invention; Main reference numeral description: 1: superconducting strip groove, 2: heat conduction groove, 3: inner joint, 4: outer joint, 5: inner turn, 6: outer turn, 7: first connection hole, 8: second connection hole, A: first winding skeleton, B: second winding skeleton, C: superconducting connection joint, D: insulating sheet, E: conductive sheet. Detailed implementation manners

[0018] The following is a detailed description of the specific embodiments of the present invention. It should be understood that the embodiments of the present invention are not limited to the embodiments shown in the drawings, and the protection scope of the present invention is not limited by the specific embodiments. The terms "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a", "one" or "the" do not denote a quantity limitation, but mean that there is at least one. Unless otherwise clearly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "having" etc. will be understood to include the stated elements or components, without excluding other elements or other components. "Connection" or "connected" and similar terms are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0019] Unless otherwise defined, all technical terms and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the art. Additionally, the meanings of the technical terms and scientific terms used in the present invention should be interpreted to have a consistent meaning with the corresponding terms defined in common technical manuals, and should not be interpreted as having an idealized or overly formal meaning, unless the present invention clearly defines so.

[0020] See Figures 1 to 4 , which shows a schematic structural diagram of a winding skeleton according to an embodiment of the present invention. The winding skeleton includes: A superconducting tape slot 1, disposed on the first surface of the winding skeleton, for accommodating at least one stacked superconducting tape, capable of protecting the superconducting tape, and providing a force-bearing structure (such as the side wall and bottom surface of the superconducting tape slot 1) to resist the electromagnetic force generated after the superconducting tape is energized; At least one cooling channel 2, disposed on the second surface of the winding skeleton opposite to the first surface, corresponding to the superconducting tape slot 1, for providing cooling to the superconducting tape in the superconducting tape slot 1, or for forming a cooling flow path when at least two winding skeletons are stacked to provide cooling to the superconducting tape in the superconducting tape slot 1 of the adjacent winding skeleton; A superconducting connection joint C, fixedly connected to both ends of the superconducting tape slot 1, for electrically connecting the superconducting tapes on at least two winding skeletons when at least two winding skeletons are stacked.

[0021] Specifically, the superconducting tape slot 1 is a spiral superconducting tape slot.

[0022] Specifically, the superconducting connection joint C includes: an inner joint 3, which is electrically connected to the inner turn 5 of the superconducting strip; and an outer joint 4, which is electrically connected to the outer turn 6 of the superconducting strip.

[0023] Specifically, in order to reduce the resistance value at low temperature, the material of the superconducting connection joint C is oxygen-free copper.

[0024] Specifically, in order to ensure the low-temperature performance, the material of the winding skeleton including the superconducting strip groove 1 is austenitic stainless steel.

[0025] Furthermore, the superconducting connection joint C is fixedly connected to both ends of the superconducting strip groove 1 by brazing or explosion welding.

[0026] Those skilled in the art should be aware that the winding skeleton provided in this embodiment is used to manufacture a superconducting coil, and no limitations are imposed on the specific shape and specific dimensions of the winding skeleton.

[0027] Furthermore, Figures 5 to 6 The structural schematic diagrams of the connection mechanisms of the first winding skeleton and the second winding skeleton according to the embodiments of the present invention are shown. Refer to Figures 5 to 6 , the winding skeleton further includes: A connection mechanism, which includes: first connection holes 7 arranged in an array, adjacent to the outer turn 6 of the superconducting strip; second connection holes 8 arranged in an array, adjacent to the inner turn 5 of the superconducting strip.

[0028] Or, A connection mechanism, which includes: first connection holes 7 arranged in an array, adjacent to the inner turn 5 of the superconducting strip; second connection holes 8 arranged in an array, adjacent to the outer turn 6 of the superconducting strip.

[0029] Specifically, the first connection hole 7 is a threaded hole, and the second connection hole 8 is a countersunk hole.

[0030] Figure 7 The structural schematic diagram when the first winding skeleton and the second winding skeleton according to the embodiments of the present invention are stacked is shown. Refer to Figure 7, The connection mechanism of the first winding skeleton A includes: first connection holes 7 arranged in an array, adjacent to the outer turn 6 of the superconducting tape; second connection holes 8 arranged in an array, adjacent to the inner turn 5 of the superconducting tape; the connection mechanism of the second winding skeleton B includes: first connection holes 7 arranged in an array, adjacent to the inner turn 5 of the superconducting tape; second connection holes 8 arranged in an array, adjacent to the outer turn 6 of the superconducting tape. When stacking the first winding skeleton A and the second winding skeleton B, align the first winding skeleton A and the second winding skeleton B in the stacking direction. At this time, the second connection hole 8 (i.e., the countersunk hole) of the first winding skeleton A just mates with the first connection hole 7 (i.e., the threaded hole) of the second winding skeleton B (i.e., the superconducting connection joint C of the first winding skeleton A and the second winding skeleton B is near the inner turn 5). Then the operator fixes it with screws or bolts. At the same time, the first connection hole 7 (i.e., the threaded hole) of the first winding skeleton A and the second connection hole 8 (i.e., the countersunk hole) of the second winding skeleton B (both are near the outer turn 6 of the corresponding winding skeleton) are fixed to the other adjacent winding skeletons with screws or bolts, and the corresponding superconducting connection joints C are all near the outer turn 6, forming a stacked winding skeleton structure.

[0031] Figure 8 , Figure 9 respectively show the structural schematic diagrams of the second winding skeleton and the first winding skeleton of the embodiments of the present invention. Refer to Figure 8 , Figure 9 , those skilled in the art can know that Figures 1 to 4 , Figure 6 is the second winding skeleton B, Figure 5 is the first winding skeleton A. The difference between the two winding skeletons lies only in the winding direction of the superconducting tape and the connection mechanism. The rest, such as the superconducting tape groove 1, the cryogenic cooling groove 2, and the structure of the superconducting connection joint C, are the same.

[0032] In summary, for the winding skeleton for manufacturing a superconducting coil provided by the present invention, by placing the superconducting tape in the superconducting tape groove 1, the constraint, fixation, and protection effects on the superconducting tape are better; the superconducting tape does not need to be wound with tension, and there is a winding skeleton body structure between turns, and its inter-turn resistance is larger than when the superconducting tapes are in direct contact. Therefore, no additional insulation treatment is required for the superconducting tape before winding; the self-provided cryogenic cooling groove 2 can transport liquid helium to directly cool the superconducting tape, and a cryogenic cooling path can be conveniently formed by stacking the winding skeletons; the two ends of the superconducting tape are directly made into superconducting connection joints C, and are directly fixed through an integral structure with the winding skeleton, making it easier to manufacture the superconducting connection joints C.

[0033] The present invention also provides a superconducting coil with a large number of coil turns, including: a plurality of first winding skeletons A and a plurality of second winding skeletons B stacked alternately along the stacking direction, Figure 10The figure shows a schematic diagram of the electrical connection structure of the stacked winding skeletons in the superconducting coil according to an embodiment of the present invention. Refer to Figure 10 Along the stacking direction, insulating sheets D and conductive sheets E are alternately arranged between the contact surfaces of the outer joints 4 of multiple first-type winding skeletons A and multiple second-type winding skeletons B, and conductive sheets E and insulating sheets D are alternately arranged between the contact surfaces of the inner joints 3 of multiple first-type winding skeletons A and multiple second-type winding skeletons B.

[0034] Specifically, the insulating sheet D is an epoxy gasket.

[0035] Specifically, the conductive sheet E is a pure indium sheet.

[0036] Furthermore, the thicknesses of both the insulating sheet D and the conductive sheet E are 0.1 mm.

[0037] The foregoing description of the specific exemplary embodiments of the present invention is for purposes of illustration and exemplification. These descriptions are not intended to limit the present invention to the precise forms disclosed, and obviously, many changes and variations are possible in light of the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical applications, so that those skilled in the art can implement and utilize various different exemplary embodiments of the present invention, as well as various different selections and changes. The protection scope of the present invention is defined by the claims and their equivalents.

Claims

1. A winding skeleton for making a superconducting coil, characterized in that, Comprising: A superconducting tape slot (1) provided on a first surface of the winding skeleton for accommodating at least one stacked superconducting tape; At least one cooling channel (2) provided on a second surface of the winding skeleton opposite to the first surface, corresponding to the superconducting tape slot (1), for providing cooling to the superconducting tape in the superconducting tape slot (1), or for forming a cooling flow channel when at least two of the winding skeletons are stacked to provide cooling to the superconducting tape in the superconducting tape slot (1) of the adjacent winding skeleton; A superconducting connection joint (C) fixedly connected to both ends of the superconducting tape slot (1) for electrically connecting the superconducting tapes on at least two of the winding skeletons when at least two of the winding skeletons are stacked.

2. The winding skeleton for manufacturing a superconducting coil according to claim 1, characterized in that, The superconducting tape slot (1) is a spiral superconducting tape slot.

3. A winding skeleton for manufacturing a superconducting coil according to claim 1, characterized in that, The superconducting connection joint (C) includes: An inner joint (3) electrically connected to the inner turn (5) of the superconducting tape; An outer joint (4) electrically connected to the outer turn (6) of the superconducting tape.

4. A winding skeleton for manufacturing a superconducting coil according to claim 3, characterized in that, The winding skeleton further includes: A connection mechanism, which includes: First connection holes (7) arranged in an array, adjacent to the outer turn (6) of the superconducting tape; Second connection holes (8) arranged in an array, adjacent to the inner turn (5) of the superconducting tape.

5. A winding skeleton for manufacturing a superconducting coil according to claim 3, wherein The winding skeleton further includes: A connection mechanism, which includes: First connection holes (7) arranged in an array, adjacent to the inner turn (5) of the superconducting tape; Second connection holes (8) arranged in an array, adjacent to the outer turn (6) of the superconducting tape.

6. A winding skeleton for manufacturing a superconducting coil according to claim 4 or 5, characterized in that, The first connection hole (7) is a threaded hole, and the second connection hole (8) is a countersunk hole.

7. A superconducting coil having a large number of coil turns, characterized in that, Comprising: A plurality of the winding skeletons according to claim 4 and a plurality of the winding skeletons according to claim 5 alternately stacked in the stacking direction, Wherein, Denote the winding skeleton according to claim 4 as the first winding skeleton (A), and the winding skeleton according to claim 5 as the second winding skeleton (B), Insulating sheets (D) and conductive sheets (E) are alternately arranged between the contact surfaces of the outer joints (4) of the plurality of the first winding skeletons (A) and the plurality of the second winding skeletons (B), and the conductive sheets (E) and insulating sheets (D) are alternately arranged between the contact surfaces of the inner joints (3) of the plurality of the first winding skeletons (A) and the plurality of the second winding skeletons (B).

8. A superconducting coil according to claim 7, characterized in that, The insulating sheet (D) is an epoxy gasket.

9. A superconducting coil according to claim 7, wherein The conductive sheet (E) is a pure indium sheet.

10. A superconducting coil according to any one of claims 7 to 9, characterized in that, The thicknesses of the conductive sheet (E) and the insulating sheet (D) are both 0.1 mm.

Images