A winding frame for making a superconducting coil, and a superconducting coil

Abstract

The present invention discloses a winding bobbin and a superconducting coil for manufacturing a superconducting coil. The winding bobbin includes: a superconducting tape slot disposed on a first surface of the winding bobbin for accommodating at least one stacked superconducting tape; at least one cooling channel disposed on a second surface of the winding bobbin, corresponding to the superconducting tape slot, for providing cooling to the superconducting tape in the superconducting tape slot, or for forming a cooling channel when at least two winding bobbins are stacked to provide cooling to the superconducting tape in the superconducting tape slot of adjacent winding bobbins; and a superconducting connecting joint fixedly connected to both ends of the superconducting tape slot for electrically connecting the superconducting tapes on at least two winding bobbins when the at least two winding bobbins are stacked. The winding bobbin has a better restraining and protecting effect on the superconducting tape, does not require additional insulation treatment before winding the superconducting tape, can directly cool the superconducting tape, more conveniently forms a cooling channel, and facilitates the manufacture of the superconducting connecting joint.

Description

Technical Field

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

[0002] At present, the following problems are common in the production of superconducting coils in China:

[0003] First, during winding, the superconducting tape is wound around the outer cylindrical surface of a winding frame (usually a metal ring) with a certain winding tension. This does not provide sufficient protection and restraint for the superconducting tape, and the superconducting tape can easily fall off the winding frame due to electromagnetic force or other external forces.

[0004] Second, the superconducting tape needs to be surface-insulated before being wound on the winding bobbin to prevent inter-turn conduction after winding, which would affect the total ampere-turns of the final superconducting magnet. Typically, surface insulation is achieved by half-lapping Kapton tape, which can easily lead to insulation damage during subsequent tension winding of the superconducting tape.

[0005] Third, superconducting coils are usually cooled by being immersed in liquid helium as a whole, or by having the liquid helium pipeline fully contact the winding skeleton for cooling. The winding skeleton then indirectly cools the superconducting tape wrapped around it. Overall immersion cooling requires more liquid helium, and pipeline contact cooling will affect the cooling efficiency due to its limited heat conductivity coefficient.

[0006] Finally, when making joints, the superconducting tape is usually led out and lengthened, and then a separate superconducting connection joint is made outside the winding frame. However, such a separately made superconducting connection joint also requires a separate fixing structure for fixation and is easily damaged by electromagnetic force. Summary of the Invention

[0007] To solve the aforementioned technical problems, the present invention provides a winding skeleton for manufacturing a superconducting coil, comprising:

[0008] a superconducting tape slot, provided on the first surface of the winding skeleton, for accommodating at least one stacked superconducting tape;

[0009] At least one cooling channel is provided on a second surface of the winding bobbin opposite to the first surface, and is provided corresponding to the superconducting tape slot, for providing cooling to the superconducting tape in the superconducting tape slot, or for forming a cooling channel when at least two winding bobbins are stacked, so as to provide cooling to the superconducting tape in the superconducting tape slot of adjacent winding bobbins;

[0010] The superconducting connection joint is fixedly connected to both ends of the superconducting tape slot and is used to electrically connect the superconducting tapes on at least two winding skeletons when at least two winding skeletons are stacked.

[0011] Furthermore, the superconducting tape groove is a spiral superconducting tape groove.

[0012] Furthermore, the superconducting connection joint includes: an inner joint electrically connected to the inner turn of the superconducting tape; and an outer joint electrically connected to the outer turn of the superconducting tape.

[0013] Furthermore, the winding skeleton (referred to as the first winding skeleton) further includes:

[0014] The connecting mechanism comprises: first connecting holes arranged in an array and adjacent to the outer turns of the superconducting tape; and second connecting holes arranged in an array and adjacent to the inner turns of the superconducting tape.

[0015] Furthermore, the winding skeleton (referred to as the second winding skeleton) further includes:

[0016] The connecting mechanism comprises: first connecting holes arranged in an array and adjacent to the inner turns of the superconducting tape; and second connecting holes arranged in an array and adjacent to the outer turns of the superconducting tape.

[0017] Furthermore, the first connecting hole is a threaded hole, and the second connecting hole is a countersunk hole.

[0018] The present invention also provides a superconducting coil with a large number of coil turns, comprising: a plurality of first winding frames and a plurality of second winding frames alternately stacked and installed along a stacking direction,

[0019] in,

[0020] Insulating sheets and conductive sheets are alternately arranged between the contact surfaces of the outer joints of multiple first winding skeletons and multiple second winding skeletons, and conductive sheets and insulating sheets are alternately arranged between the contact surfaces of the inner joints of multiple first winding skeletons and multiple second winding skeletons.

[0021] Furthermore, the insulating sheet is an epoxy gasket.

[0022] Furthermore, the conductive sheet is a pure indium sheet.

[0023] Furthermore, the thickness of the conductive sheet and the insulating sheet are both 0.1 mm.

[0024] Compared with the prior art, the winding skeleton provided by the present invention for making superconducting coils places the superconducting tape in the superconducting tape slot, which has better restraint, fixation and protection effects on the superconducting tape; the superconducting tape does not need to be wound with tension, and the winding skeleton body structure exists between the turns, and its inter-turn resistance is greater than when the superconducting tape is in direct contact, so that the superconducting tape does not need additional insulation treatment before winding; the built-in cooling groove can transport liquid helium to directly cool the superconducting tape, and the cooling path can be conveniently formed by stacking the winding skeletons; superconducting connection joints are directly made at both ends of the superconducting tape, and are directly fixed through the integral structure with the winding skeleton, making it easier to make the superconducting connection joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of a superconducting tape slot in a winding skeleton according to an embodiment of the present invention is shown;

[0026] Figure 2 A schematic structural diagram of a cooling groove in a winding skeleton according to an embodiment of the present invention is shown;

[0027] Figure 3 It shows a schematic structural diagram of a superconducting connection joint in a winding skeleton according to an embodiment of the present invention;

[0028] Figure 4 A schematic structural diagram of inner turns and outer turns in a winding skeleton according to an embodiment of the present invention is shown;

[0029] Figure 5 It shows a schematic structural diagram of a connecting mechanism in a first winding skeleton according to an embodiment of the present invention;

[0030] Figure 6 It shows a structural schematic diagram of a connection mechanism in a second winding bobbin according to an embodiment of the present invention;

[0031] Figure 7 A schematic structural diagram of a first winding bobbin and a second winding bobbin stacked according to an embodiment of the present invention is shown;

[0032] Figure 8 It shows a structural schematic diagram of a second winding skeleton according to an embodiment of the present invention;

[0033] Figure 9 It shows a structural schematic diagram of a first winding skeleton according to an embodiment of the present invention;

[0034] Figure 10 A schematic diagram of the electrical connection structure of stacked winding bobbins in a superconducting coil according to an embodiment of the present invention is shown;

[0035] Description of main reference numerals:

[0036] 1: Superconducting tape slot, 2: Cooling groove, 3: Inner joint, 4: Outer joint, 5: Inner turn, 6: Outer turn, 7: First connection hole, 8: Second connection hole, A: First type of winding skeleton, B: Second type of winding skeleton, C: Superconducting connection joint, D: Insulating sheet, E: Conductive sheet. DETAILED DESCRIPTION

[0037] The following is a detailed description of 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 accompanying drawings, and the scope of protection 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 indicate any order, quantity, or importance, but are only used to distinguish different components. Similarly, terms such as "one," "an," or "the" do not indicate a quantitative limitation, but rather indicate the presence of at least one. Unless otherwise expressly indicated, throughout the specification and claims, the term "comprise" or variations such as "include" or "comprising" will be understood to include the elements or components stated, without excluding other elements or components. Terms such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] Unless otherwise defined, the meanings of all technical terms and scientific terms used in the present invention are the same as those commonly understood by ordinary technicians in the field. In addition, the meanings of the technical terms and scientific terms used in the present invention should be interpreted as having the same meanings as the corresponding terms defined in commonly used technical manuals, and should not be interpreted as having idealized or excessive formal meanings, unless explicitly defined in this way in the present invention.

[0039] See also Figures 1 to 4 , shows a schematic structural diagram of a winding skeleton according to an embodiment of the present invention, wherein the winding skeleton comprises:

[0040] The superconducting tape slot 1 is provided on the first surface of the winding skeleton and is used to accommodate at least one stacked superconducting tape. It can protect the superconducting tape and provide a force-bearing structure (such as the side walls and bottom surface of the superconducting tape slot 1) to resist the electromagnetic force generated when the superconducting tape is energized;

[0041] At least one cooling channel 2 is provided on a second surface of the winding bobbin opposite to the first surface, and is provided 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 channel when at least two winding bobbins are stacked to provide cooling to the superconducting tape in the superconducting tape slot 1 of adjacent winding bobbins;

[0042] The superconducting connection joints C are fixedly connected to both ends of the superconducting tape slot 1 and are used to electrically connect the superconducting tapes on at least two winding bobbins when at least two winding bobbins are stacked.

[0043] Specifically, the superconducting tape slot 1 is a spiral superconducting tape slot.

[0044] Specifically, the superconducting connection joint C includes: an inner joint 3 electrically connected to the inner turn 5 of the superconducting tape; and an outer joint 4 electrically connected to the outer turn 6 of the superconducting tape.

[0045] Specifically, in order to reduce the resistance value at low temperatures, the superconducting connection joint C is made of oxygen-free copper.

[0046] Specifically, in order to ensure low-temperature performance, the material of the winding skeleton including the superconducting tape slot 1 is austenitic stainless steel.

[0047] Furthermore, the superconducting connection joints C are fixedly connected to both ends of the superconducting tape slot 1 by brazing or explosion welding.

[0048] Those skilled in the art should know that the winding bobbin provided in this embodiment is used to manufacture a superconducting coil, and there is no limitation on the specific shape and size of the winding bobbin.

[0049] Further, Figure 5~Figure 6 A schematic diagram showing the structure of the connection mechanism of the first winding frame and the second winding frame according to an embodiment of the present invention is shown. Figure 5~Figure 6 , the winding skeleton also includes:

[0050] The connecting mechanism comprises: first connecting holes 7 arranged in an array, which are arranged adjacent to the outer turns 6 of the superconducting tape; and second connecting holes 8 arranged in an array, which are arranged adjacent to the inner turns 5 of the superconducting tape.

[0051] or,

[0052] The connecting mechanism comprises: first connecting holes 7 arranged in an array, which are arranged adjacent to the inner turns 5 of the superconducting tape; and second connecting holes 8 arranged in an array, which are arranged adjacent to the outer turns 6 of the superconducting tape.

[0053] Specifically, the first connecting hole 7 is a threaded hole, and the second connecting hole 8 is a countersunk hole.

[0054] Figure 7 FIG1 shows a schematic diagram of the structure of the first winding frame and the second winding frame stacked in an embodiment of the present invention, see FIG1 Figure 7The connection mechanism of the first winding skeleton A includes: first connection holes 7 arranged in an array, which are arranged adjacent to the outer turn 6 of the superconducting tape; second connection holes 8 arranged in an array, which are arranged 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, which are arranged adjacent to the inner turn 5 of the superconducting tape; second connection holes 8 arranged in an array, which are arranged adjacent to the outer turn 6 of the superconducting tape. When stacking the first type of winding frame A and the second type of winding frame B, align the first type of winding frame A and the second type of winding frame B in the stacking direction. At this time, the second connection hole 8 of the first type of winding frame A, that is, the countersunk hole, and the first connection hole 7, that is, the threaded hole, of the second type of winding frame B are exactly matched (that is, the superconducting connection joint C of the first type of winding frame A and the second type of winding frame B is located near the inner turn 5). The operator then fixes them with screws or bolts. At the same time, the first connection hole 7, that is, the threaded hole, of the first type of winding frame A and the second connection hole 8, that is, the countersunk hole (both located near the outer turn 6 of the corresponding winding frame) are fixed to other adjacent winding frames by screws or bolts, and the corresponding superconducting connection joints C are all located near the outer turn 6, forming a stacked winding frame structure.

[0055] Figure 8 、 Figure 9 The structural diagrams of the second winding skeleton and the first winding skeleton of the embodiment of the present invention are shown respectively. Figure 8 、 Figure 9 , those skilled in the art will know that Figures 1 to 4 、 Figure 6 For the second type of winding skeleton B, Figure 5 This is the first type of winding bobbin A. The only difference between the two winding bobbins is the winding direction and connection mechanism of the superconducting tape. The rest of the structures such as the superconducting tape slot 1, the cooling slot 2, and the superconducting connection joint C are the same.

[0056] In summary, the winding skeleton provided by the present invention for making superconducting coils has better restraint, fixation and protection effects on the superconducting tape by placing the superconducting tape in the superconducting tape slot 1; the superconducting tape does not need to be wound with tension, and there is a winding skeleton body structure between the turns, and the inter-turn resistance is greater than when the superconducting tape is in direct contact, so that the superconducting tape does not need additional insulation treatment before winding; the built-in cooling groove 2 can transport liquid helium to directly cool the superconducting tape, and a cooling path can be conveniently formed by stacking the winding skeletons; superconducting connection joints C are directly made at both ends of the superconducting tape, and are directly fixed with the winding skeleton through an integrated structure, making it easier to make the superconducting connection joints C.

[0057] The present invention also provides a superconducting coil with a large number of coil turns, comprising: a plurality of first-type winding frames A and a plurality of second-type winding frames B alternately stacked and installed along a stacking direction, Figure 10FIG1 shows a schematic diagram of the electrical connection structure of the stacked winding skeletons in the superconducting coil of the embodiment of the present invention, see 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.

[0058] Specifically, the insulating sheet D is an epoxy gasket.

[0059] Specifically, the conductive sheet E is a pure indium sheet.

[0060] Furthermore, the thickness of the insulating sheet D and the conductive sheet E are both 0.1 mm.

[0061] The foregoing descriptions of specific exemplary embodiments of the present invention are for purposes of illustration and description. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many modifications and variations are possible in light of the foregoing teachings. The exemplary embodiments have been selected and described for the purpose of explaining the specific principles of the invention and their practical application, thereby enabling those skilled in the art to realize and utilize a variety of exemplary embodiments of the invention and various options and variations. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A winding frame for making a superconducting coil, characterized in that: include: A superconducting tape slot (1), provided on the first surface of the winding skeleton, for accommodating at least one stacked superconducting tape; At least one cooling channel (2) is provided on a second surface of the winding skeleton opposite to the first surface, and is provided corresponding to the superconducting tape slot (1), and is used to provide cooling to the superconducting tape in the superconducting tape slot (1), or is used to form a cooling channel when at least two winding skeletons are stacked, so as to provide cooling to the superconducting tape in the superconducting tape slot (1) of adjacent winding skeletons; a superconducting connecting joint (C) is fixedly connected to both ends of the superconducting tape slot (1), and is used to electrically connect the superconducting tapes on at least two winding skeletons when at least two winding skeletons are stacked; The superconducting connection joint (C) is made of oxygen-free copper, the winding frame is made of austenitic stainless steel, the superconducting connection joint (C) is provided with a superconducting tape slot (1), and is directly fixed to the integral structure of the winding frame and is located inside the winding frame; The superconducting connection joint (C) comprises: an inner joint (3) electrically connected to the inner turn (5) of the superconducting tape; and an outer joint (4) electrically connected to the outer turn (6) of the superconducting tape.

2. A winding frame for making a superconducting coil according to claim 1, characterized in that: The superconducting tape slot (1) is a spiral superconducting tape slot.

3. The winding frame for manufacturing a superconducting coil according to claim 1, characterized in that: The winding skeleton also includes: The connecting mechanism comprises: first connecting holes (7) arranged in an array, which are arranged adjacent to the outer turns (6) of the superconducting tape; and second connecting holes (8) arranged in an array, which are arranged adjacent to the inner turns (5) of the superconducting tape.

4. The winding frame for manufacturing a superconducting coil according to claim 1, characterized in that: The winding skeleton also includes: The connecting mechanism comprises: first connecting holes (7) arranged in an array, which are arranged adjacent to the inner turns (5) of the superconducting tape; and second connecting holes (8) arranged in an array, which are arranged adjacent to the outer turns (6) of the superconducting tape.

5. A winding frame for making a superconducting coil according to claim 3 or 4, characterized in that: The first connecting hole (7) is a threaded hole, and the second connecting hole (8) is a countersunk hole.

6. A superconducting coil having a large number of turns, characterized in that: include: A plurality of winding bobbins according to claim 3 and a plurality of winding bobbins according to claim 4 are alternately stacked and installed along a stacking direction, in, The winding frame described in claim 3 is the first winding frame (A), and the winding frame described in claim 4 is the second winding frame (B). Insulating sheets (D) and conductive sheets (E) are alternately arranged between contact surfaces of the outer joints (4) of the plurality of first winding skeletons (A) and the plurality of second winding skeletons (B), and the conductive sheets (E) and insulating sheets (D) are alternately arranged between contact surfaces of the inner joints (3) of the plurality of first winding skeletons (A) and the plurality of second winding skeletons (B).

7. The superconducting coil according to claim 6, characterized in that: The insulating sheet (D) is an epoxy gasket.

8. The superconducting coil according to claim 6, characterized in that: The conductive sheet (E) is a pure indium sheet.

9. A superconducting coil according to any one of claims 6 to 8, characterized in that: The thickness of the conductive sheet (E) and the insulating sheet (D) are both 0.1 mm.

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