A design of a large-size superconducting double-pancake coil skeleton

Abstract

The present invention discloses a large-size superconducting double-pancake coil skeleton design, which belongs to the field of high-temperature superconducting technology, and includes a skeleton body, an auxiliary support part, and a coil joint. Since the skeleton body in the present invention is made of austenitic stainless steel or titanium alloy, it can withstand a certain mechanical strength and is manufactured with a metal material with high thermal conductivity, and can simultaneously meet the thermal and mechanical requirements of a strong field magnet under low temperature and large current. The parts processing difficulty is low, the assembly is simple and convenient, and it can be matched with the coil winding. The auxiliary support part can uniformly apply a pre-tightening force to the strip, and can be suitable for magnets of special shapes. The Z-shaped insulating part is used at the joint to achieve a symmetrical strip-shaped design, which can be uniformly stressed during the transportation and assembly of the magnet, and protect the strip from external forces. At the same time, it has a compact joint design and auxiliary support, which can maximize the use of space and solve the problem of the straight line segment being affected by electromagnetic force.

Description

Technical Field

[0001] The invention belongs to the technical field of high-temperature superconductivity, and in particular relates to a large-size superconducting double-pancake coil skeleton design. Background Art

[0002] The discovery of superconductivity is one of the most important discoveries in the history of human science. With the continuous development and maturity of high-temperature superconducting technology, the application field of high-temperature superconducting technology has been continuously expanded. In recent years, the second-generation high-temperature superconducting materials (REBCO coated conductors) superconducting materials have become one of the solutions for preparing strong field magnets due to their higher upper critical magnetic field and engineering current density. They have great application potential in large scientific devices and medical magnets such as tokamak magnets, accelerator magnets, and nuclear magnetic resonance medical (NMR) magnets.

[0003] The double pancake coil is made of superconducting tape wound directly or with an insulating layer. The innermost or outermost turns are designed to allow the tape to span two pancakes. The advantage of this design is that there is no joint inside the coil, which reduces the transmission resistance. At the same time, the current lead joints can be placed all inside or all outside, which has advantages in magnets with high space requirements such as tokamaks. However, due to the small scale of commercial applications of superconducting double pancake coils, customized and miniaturized designs are used in a few experimental research applications. At present, some research teams use materials such as nylon or plastic for 3D printing, while others use epoxy resin plates (G10) for mechanical processing. This method is only suitable for small superconducting coils for principle research, but it is difficult to process and manufacture large-scale coils above the meter level. Materials such as nylon, plastic, and epoxy resin may cause thermal and mechanical problems.

[0004] Based on this, the prior art has the following technical problems:

[0005] The use of materials such as nylon, plastic, and epoxy resin cannot meet the mechanical and thermal requirements of high-field magnet applications, and it is difficult to process and manufacture large-sized coils above the meter level. Currently, most research teams only study circular or racetrack-shaped superconducting coils. However, in tokamak magnets and accelerator magnets, there are more irregular-shaped magnets, and the coil skeleton design is more difficult. Therefore, there is no unified standard for the skeleton design of superconducting double-pancake coils, which will be difficult to use in large-scale commercial applications in the future. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a large-scale superconducting double-pancake coil skeleton design, which is used to realize the coil skeleton design to operate under extremely low temperature and extremely high electromagnetic force, and is convenient to complete processing and manufacturing on a large scale to meet the compact structure of the device.

[0007] The present invention discloses a large-size superconducting double-pancake coil frame design, comprising: a frame body, an auxiliary support device; the auxiliary support device is arranged on the straight part of the frame body;

[0008] The frame body includes a coil frame, a wire blocking portion, and a separator; the wire blocking portion includes a first wire blocking portion and a second wire blocking portion; the coil frame is connected to the first wire blocking portion; the separator is connected to the coil frame and is perpendicular to the coil frame; the second wire blocking portion is connected to the coil frame; the separator is arranged between the first wire blocking portion and the second wire blocking portion, forming a first wire groove and a second wire groove;

[0009] The auxiliary support device includes an auxiliary support portion and a through hole; the auxiliary support portion is adapted to the wire blocking portion; a through hole is provided on the auxiliary support portion; at least two through holes are provided, which are respectively arranged corresponding to the first wire groove and the second wire groove; the preload member passes through the through hole, and the through hole cooperates with the preload member.

[0010] Preferably, the skeleton body is made of austenitic stainless steel or titanium alloy.

[0011] Preferably, the skeleton body also includes a connecting hole and a fixing hole. The connecting hole is provided on the coil skeleton, and is used for connecting the wire blocking part to the coil skeleton, and is also used for connecting the partition part to the coil skeleton; the fixing hole is connected to an external winding device through a connecting piece.

[0012] Preferably, the through hole is provided with a pre-tightening member, and the pre-tightening force of the skeleton body is adjusted by controlling the pre-tightening member.

[0013] Preferably, the auxiliary support portion is further provided with an auxiliary support fixing hole; the auxiliary support fixing hole is used to fix the auxiliary support portion to the skeleton body.

[0014] Preferably, it also includes a coil connector;

[0015] The coil connector includes a positive copper terminal, a Z-shaped insulating component, and a negative copper terminal; the positive copper terminal and the Z-shaped insulating component are fixedly connected by a nylon bolt; and the negative copper terminal and the Z-shaped insulating component are fixedly connected by a nylon bolt.

[0016] Preferably, the Z-shaped insulating component is specifically made of Teflon or epoxy resin.

[0017] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0018] 1) Since the skeleton body in the present invention is made of austenitic stainless steel or titanium alloy, which can withstand a certain mechanical strength and is processed and manufactured with metal materials with high thermal conductivity, it can simultaneously meet the thermal and mechanical requirements of strong field magnets under low temperature and high current. The parts processing difficulty is low, the assembly is simple and convenient, and it can be coordinated with the coil winding.

[0019] 2) The auxiliary support portion can uniformly apply pre-tightening force to the strip and can be suitable for magnets of special shapes.

[0020] 3) The Z-shaped insulating component at the joint realizes a symmetrical strip-shaped design, which can evenly bear the force during the transportation and assembly of the magnet and protect the strip from external forces.

[0021] 4) The skeleton design of large-size superconducting double-pancake coils has a unified standard and is suitable for application in future large-scale commercial applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the overall structure of the embodiment of the present invention.

[0023] Figure 2 Schematic diagram of the assembly method of the skeleton in the embodiment of the present invention.

[0024] Figure 3 Schematic diagram of the auxiliary support portion of the skeleton in an embodiment of the present invention.

[0025] Figure 4 Schematic diagram of the joint design of the coil skeleton in an embodiment of the present invention.

[0026] Figure 1 1 is a coil skeleton, 2 is a wire blocking part, 3 is a partition part, 4 is a connecting hole, 5 is a fixing hole, 6 is an auxiliary supporting part, 7 is a through hole, 8 is an auxiliary supporting fixing hole, 9 is a positive copper terminal, 10 is an insulating component, and 11 is a negative copper terminal. Specific implementation methods

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In order to solve the technical problems that the existing technology cannot meet the mechanical and thermal requirements in high-field magnet applications and that large-sized coils of more than meter size are difficult to process and manufacture, the present invention provides a large-sized superconducting double-pancake coil skeleton design.

[0029] See also Figure 1 , the embodiment of the present invention discloses a large-size superconducting double-pancake coil skeleton design, including: a skeleton body, an auxiliary support device;

[0030] The skeleton body includes a coil skeleton, a wire blocking part, and a partition part; the wire blocking part includes a first wire blocking part and a second wire blocking part, which serve as the outermost baffle of the entire skeleton structure during the winding process; the coil skeleton is connected to the first wire blocking part; the partition part is connected to the coil skeleton and is perpendicular to the coil skeleton; the second wire blocking part is connected to the coil skeleton; the partition part is arranged between the first wire blocking part and the second wire blocking part, forming a first wire groove and a second wire groove; the first wire groove is used for winding the first coil cake, and the second wire groove is used for winding the second coil cake. The entire skeleton body is made of austenitic stainless steel, titanium alloy and other materials, and can withstand a certain mechanical strength and has a high thermal conductivity. Metal materials are processed and manufactured to make the skeleton structure of the coil meet the requirements of mechanics and thermals.

[0031] On the basis of the above embodiments, since the straight part in the special shape coil (such as tokamak magnet, accelerator magnet, etc.) has no effective mechanical support, the tension will be reduced and the strip cannot fit well with the frame. The present invention is also provided with an auxiliary support device, see attached Figure 3 .

[0032] The auxiliary support device includes an auxiliary support part and a through hole; the auxiliary support part is adapted to the wire blocking part; a through hole is opened on the auxiliary support part; at least two through holes are provided, which are respectively arranged corresponding to the first wire groove and the second wire groove; the preload member passes through the through hole, and the through hole cooperates with the preload member. The auxiliary support part is used to apply a preload force to the strip in the coil with a special shape of a straight part to prevent the strip from shaking due to electromagnetic force during operation, and at the same time, the auxiliary fixing hole 5 fixes the skeleton body.

[0033] It can be seen from the above embodiments that the design using the auxiliary support device has a compact joint design and auxiliary support, which can maximize the use of space and solve the problem of the straight part being affected by the electromagnetic force.

[0034] Furthermore, the through hole 7 is provided with a bolt, and the pre-tightening force of the auxiliary support portion 6 is adjusted by controlling the bolt, and the pre-tightening force of the auxiliary support portion can be adjusted by adjusting the tightness of the bolt.

[0035] It can be understood that effective mechanical support is provided for the straight portion of the special-shaped coil to maintain the tension applied. Therefore, the present invention is also practical for magnets of special shapes, and the installation position of the auxiliary support portion can be determined according to actual needs.

[0036] In the embodiment of the present invention, a coil connector is also included. Figure 4 .

[0037] The coil connector includes a positive copper terminal 9, a Z-shaped insulating component 10, and a negative copper terminal 11; the positive copper terminal 9 and the Z-shaped insulating component 10 are fixedly connected by nylon bolts; the negative copper terminal 11 and the Z-shaped insulating component 10 are fixedly connected by nylon bolts.

[0038] Furthermore, in order to have good low-temperature mechanical properties and insulation properties, the material of the Z-shaped insulation component 10 is specifically Teflon or epoxy resin.

[0039] In order to better understand the working principle of the embodiment of the present invention, the following design schemes may be included in actual use. Figure 2 .

[0040] First, Figure 2 As shown in a, the coil frame 1 is connected to the frame side plate 2 at the bottom through the connecting hole 4 to wind the first coil cake. Figure 2 As shown in b, the skeleton middle plate 3 and the coil skeleton 1 are connected and installed at the top through the connection hole 4, so that the strip passes through the changeover area of ​​the middle plate 3, and then the second coil cake is wound. Figure 2 As shown in Fig. c, the top frame side plate 2 is installed. During the entire winding process, the frame as a whole is fixed to the winding device through the fixing holes 5, and the tension is kept applied throughout the whole process.

[0041] After winding is completed, Figure 3 As shown, the auxiliary support part 6 is installed on the coil frame through the auxiliary support fixing hole 8, and the bolt is inserted into the through hole 7. The pre-tightening force of the straight section strip is adjusted according to the tightening degree of the bolt.

[0042] Further preparation of the coil connector is required, taking the positive electrode as an example, Figure 4 As shown in a and b, the strip is first welded to the side of the copper terminal 9 of special shape, and after welding, it is connected to the Z-shaped insulating component 10 by non-conductive nylon bolts; then, as shown in Figure 4 As shown in c and d, the copper terminal 9 and the Z-shaped insulating component 10 are fixed to the frame side plate 2 by bolts. The preparation and assembly of the negative copper terminal is similar.

[0043] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0044] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A large-size superconducting double-pancake coil skeleton design, characterized in that: include: A skeleton body and an auxiliary support device; the auxiliary support device is arranged on a straight part of the skeleton body; The frame body comprises a coil frame (1), a wire blocking portion (2), and a separator (3); the wire blocking portion (2) comprises a first wire blocking portion and a second wire blocking portion; the coil frame (1) is connected to the first wire blocking portion; the separator (3) is connected to the coil frame (1) and is perpendicular to the coil frame (1); the second wire blocking portion is connected to the coil frame (1); the separator (3) is arranged between the first wire blocking portion and the second wire blocking portion to form a first wire groove and a second wire groove; The auxiliary support device comprises an auxiliary support portion (6) and a through hole (7); the auxiliary support portion (6) is matched with the wire blocking portion (2); a through hole (7) is provided on the auxiliary support portion (6); at least two through holes (7) are provided, which are respectively arranged corresponding to the first wire groove and the second wire groove; a pre-tightening member passes through the through hole (7), and the through hole (7) cooperates with the pre-tightening member; The skeleton body is specifically made of austenitic stainless steel or titanium alloy; The through hole (7) is provided with a pre-tightening member, and the pre-tightening force of the skeleton body is adjusted by controlling the pre-tightening member.

2. A large-size superconducting double-pancake coil skeleton design according to claim 1, characterized in that: The skeleton body further comprises a connecting hole (4) and a fixing hole (5); the connecting hole (4) is provided on the coil skeleton (1); the connecting hole is used for connecting the wire blocking portion (2) to the coil skeleton (1), and is also used for connecting the partition portion (3) to the coil skeleton (1); the fixing hole (5) is connected to an external winding device via a connecting piece.

3. A large-size superconducting double-pancake coil skeleton design according to claim 1, characterized in that: The auxiliary support portion (6) is also provided with an auxiliary support fixing hole (8); the auxiliary support fixing hole (8) is used to fix the auxiliary support portion (6) to the skeleton body.

4. A large-size superconducting double-pancake coil skeleton design according to claim 1, characterized in that: Also included are coil connectors; The coil connector comprises a positive copper terminal (9), a Z-shaped insulating component (10), and a negative copper terminal (11); the positive copper terminal (9) and the Z-shaped insulating component (10) are fixedly connected via a nylon bolt; and the negative copper terminal (11) and the Z-shaped insulating component (10) are fixedly connected via a nylon bolt.

5. A large-size superconducting double-pancake coil skeleton design according to claim 4, characterized in that: The Z-shaped insulating component (10) is specifically made of Teflon or epoxy resin.

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