A direct current induction heated opposed-pole type superconducting magnet structure

Abstract

The application provides a direct current induction heating opposite-pole type superconducting magnet structure which is composed of a liquid nitrogen container, an iron core, a superconducting coil framework, a superconducting coil, an opposite-pole center heating rod and a current lead port. The parts are connected by bolts, and the number of opposite-pole iron core coils and the number of turns of the strip can be increased according to the requirement of the magnetic field in the air gap. The iron core of the new superconducting magnet is made of pure iron DT4 material, which is used for supporting the coil and guiding the magnetic circuit; the coil framework is made of aluminum alloy material, which reduces the weight of the magnet and is used for winding the coil; the superconducting strip (coil) is made of the second generation high temperature superconducting strip YBCO; the liquid nitrogen container is made of S30408 stainless steel material, which avoids magnetic conduction and provides a low temperature operating environment for the superconducting magnet. The size of the iron core and the number of coils can be specifically set according to the requirements of the blank heating power and the target time. The superconducting magnet is placed in the liquid nitrogen container, the copper lead terminal of the coil framework is increased, which is used for welding the superconducting strip, and the same direction current is passed in, so as to increase the density of the magnet in the air gap.

Description

Technical Field

[0001] This invention relates to the field of superconducting magnet technology, and more particularly to a DC induction heating counter-polarity superconducting magnet structure. Background Technology

[0002] Compared with traditional AC induction heating, high-temperature superconducting DC induction heating devices have advantages such as high efficiency, good heating quality, and low loss, and have great market competitiveness in the preheating treatment of non-ferrous metals such as aluminum, copper and their alloys.

[0003] Due to the high demand for aluminum alloy materials in industries such as aerospace and automotive engineering, aluminum production lines urgently need to increase the preheating speed of aluminum rods while ensuring the quality of aluminum materials. Cylindrical pole-pole core structures can increase the magnet density within the heating gap of the aluminum rod, therefore, multi-superconducting coil superconducting magnets are an inevitable trend in DC induction heating. Summary of the Invention

[0004] The embodiments of the present invention provide a DC induction heating counter-polarity superconducting magnet structure to solve the technical problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution.

[0006] A DC induction heated counter-polarity superconducting magnet structure includes a liquid nitrogen container, an iron core, a superconducting coil frame, a superconducting coil, a counter-polarity center heating rod, and a current lead port.

[0007] The liquid nitrogen container has a liquid nitrogen temperature zone and a heating room temperature zone. The heating room temperature zone is connected to the external room temperature environment. The iron core, superconducting coil, and superconducting coil frame are located in the heating room temperature zone. The superconducting coil is wound on the superconducting coil frame, which is connected to the iron core. The superconducting coil frame has lead terminals, which are connected to both ends of the superconducting coil. The lead terminals are also connected to current lead ports. The current lead ports are also used for electrical connection to an external power source. A central heating rod passes through the superconducting coil.

[0008] In the liquid nitrogen temperature zone, liquid nitrogen is injected to form a high-temperature superconducting magnet consisting of an iron core, a superconducting coil, and a superconducting coil frame located in the heated room temperature zone.

[0009] Preferably, the core includes a toroidal core and a pair of opposing pole cores, with the opposing pole cores arranged opposite each other on the inner wall of the toroidal core; the toroidal core is installed laterally in the heating room temperature zone, and the gap between the cavity of the toroidal core and the opposing pole core is used to accommodate the superconducting coil frame and the superconducting coil.

[0010] Preferably, the superconducting coil frame includes a first flange, a core, and a second flange. The first flange and the second flange are connected to each other at intervals through the core. The outer diameter of the core is smaller than the outer diameter of the first flange and the second flange. The superconducting coil is wound on the outside of the core. The superconducting coil frame has an axially through cavity for accommodating the counter electrode center heating rod. The first flange and the second flange have a first mounting groove for connecting the lead terminal.

[0011] Preferably, the outer side of the core tube also has a second mounting groove; the lead terminal has an L-shaped structure, including an inlet terminal and an outlet terminal; the inlet terminal includes a first base plate and a first terminal plate that are perpendicularly connected to each other, and the outlet terminal includes a second base plate and a second terminal plate that are perpendicularly connected to each other. The first terminal plate and the second terminal plate are used to be installed in the first mounting groove, and the first base plate and the second base plate are used to be installed in the second mounting groove. The first terminal plate and the second terminal plate have lead holes, and one side of the second base plate has a bevel.

[0012] Preferably, the liquid nitrogen container has a cylindrical structure, with the liquid nitrogen temperature zone located at the top and the heating room temperature zone located at the bottom. The top of the liquid nitrogen container has a removable cover plate, and the current lead port is installed on the cover plate, including an inlet port and an outlet port. The inlet port is used to connect to the inlet terminal, and the outlet port is used to connect to the outlet terminal.

[0013] Preferably, the liquid nitrogen container has a vacuum jacket inside its sidewall.

[0014] As can be seen from the technical solutions provided by the embodiments of the present invention above, the present invention provides a DC induction heating counter-polarity superconducting magnet structure, which is composed of a liquid nitrogen container, an iron core, a superconducting coil frame, a superconducting coil, a counter-polarity center heating rod, and current lead ports. The parts are connected by bolts, and the number of counter-polarity iron core coils and the number of strip turns can be increased according to the magnetic field requirements within the air gap. The iron core of the novel superconducting magnet is made of electrical pure iron DT4 material, used to support the coil and guide the magnetic circuit; the coil frame is made of aluminum alloy material to reduce the weight of the magnet and to wind the coil; the superconducting strip (coil) is made of second-generation high-temperature superconducting strip YBCO; the liquid nitrogen container is made of S30408 ​​stainless steel material to avoid magnetism and provide a low-temperature operating environment for the superconducting magnet. The size of the iron core and the number of coils can be specifically set according to the heating power of the billet and the target time requirements. The superconducting magnet is placed in the liquid nitrogen container, and copper lead terminals are added to the coil frame for welding the superconducting strip and for passing current in the same direction to increase the magnet density within the air gap. The number of the superconducting magnet frame and its coils is not limited to... Figure 1 The single coil frame can be configured in different quantities according to actual needs.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of the invention. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the overall structure of a DC induction heating counter-polarity superconducting magnet structure provided by the present invention;

[0018] Figure 2 A schematic diagram of the core structure of a DC induction heated counter-polarity superconducting magnet provided by the present invention;

[0019] Figure 3 A superconducting coil skeleton structure diagram of a DC induction heating counter-polarity superconducting magnet structure provided by the present invention;

[0020] Figure 4 A schematic diagram of the inlet port structure of a DC induction heating counter-polarity superconducting magnet structure provided by the present invention;

[0021] Figure 5 A schematic diagram of the output port structure of a DC induction heating counter-polarity superconducting magnet structure provided by the present invention;

[0022] Figure 6 This invention provides a structural diagram of a liquid nitrogen container with a DC induction heating counter-polarity superconducting magnet structure.

[0023] In the picture:

[0024] 1. Liquid nitrogen container; 11. Cover plate; 111. Inlet port; 112. Outlet port; 12. Vacuum jacket; 2. Iron core; 21. Annular iron core; 22. Counter pole iron core; 23. Connecting foot;

[0025] 3. Superconducting coil frame 31. First flange 32. Second flange 33. Core 34. Inlet terminal 341. First base plate 342. First terminal plate 35. Outlet terminal 351. Second base plate 352. Second terminal plate 36. First mounting groove 37. Second mounting groove 38. Mounting ear;

[0026] 4. Heating rod 5. Support bracket. Detailed Implementation

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0028] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or couplings. The term “and / or” as used herein includes any and all combinations of one or more of the associated listed items.

[0029] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0030] To facilitate understanding of the embodiments of the present invention, the following will provide further explanation and description with reference to the accompanying drawings and several specific embodiments. These embodiments do not constitute a limitation on the embodiments of the present invention.

[0031] See Figure 1 The present invention provides a DC induction heating counter-polarity superconducting magnet structure, including a liquid nitrogen container 1, an iron core 2, a superconducting coil frame 3, a superconducting coil (not shown in the figure), a counter-polarity center heating rod 4, and a current lead port.

[0032] The liquid nitrogen container 1 has a liquid nitrogen temperature zone and a heating room temperature zone. The liquid nitrogen temperature zone is a sealed structure, while the heating room temperature zone has an opening and is connected to the ambient temperature. The iron core 2, the superconducting coil, and the superconducting coil frame 3 are installed in the heating room temperature zone of the aluminum rod at the pole center. The superconducting coil is wound on the superconducting coil frame 3, which is connected to the iron core 2. The superconducting coil frame 3 has lead terminals, which are connected to both ends of the superconducting coil. The lead terminals are also connected to current lead ports. The current lead ports are also used for electrical connection to an external power source. The pole center heating rod 4 passes through the superconducting coil and is used to heat the iron core 2, the superconducting coil, and the superconducting coil frame 3.

[0033] The liquid nitrogen temperature zone is formed by injecting liquid nitrogen, which causes the iron core 2, superconducting coil and superconducting coil frame 3 located in the room temperature zone of the aluminum rod at the pole center to be constructed into a high temperature superconducting magnet.

[0034] In a preferred embodiment of the present invention, the iron core 2 is made of electrical pure iron DT4, a material with high electrical conductivity, such as... Figure 2 As shown, it consists of two parts: a toroidal core 21 and a counter pole core 22. The toroidal core 21 guides the magnetic circuit, reduces magnetic leakage, and also provides mechanical support. The counter pole core 22 serves to mount the coil support 5 and form a heating air gap. As shown, the toroidal core 21 is a circular ring structure, installed laterally (with the central axis along the horizontal direction) within the heating room temperature zone. The counter pole cores 22 are arranged opposite each other on the inner wall (side wall of the inner cavity) of the toroidal core 21, with a certain gap between them. The width of this gap can be adjusted according to the actual needs of the number of coils. The toroidal core 21 guides the magnetic circuit, reduces magnetic leakage, and also provides mechanical support. The counter pole core 22 serves to mount the coil support 5 and form a heating air gap.

[0035] In the preferred embodiments provided by the present invention, such as Figure 3 As shown, the superconducting coil frame 3 includes a first flange 31, a core 33, and a second flange 32. The first flange 31 and the second flange 32 are connected to each other at intervals via the core 33, with the core 33 located in the middle and the two flanges connected to both sides of the core 33. The outer diameter of the core 33 is smaller than the outer diameter of the first flange 31 and the second flange 32, so that the two flanges form protective ears to prevent the superconducting coil from falling off. The superconducting coil is wound on the outside of the core 33. The superconducting coil frame 3 has an axially penetrating cavity for accommodating the counter-polarity heating rod 4. The first flange 31 and the second flange 32 have a first mounting groove 36 for connecting the lead terminals.

[0036] The outer surface of the core tube also has two second mounting slots 37 in the area adjacent to the first mounting slot 36. For example... Figure 4 and 5As shown, the lead terminals have an L-shaped structure, including an inlet terminal 34 and an outlet terminal 35. The inlet terminal 34 includes a first base plate 341 and a first terminal plate 342 connected perpendicularly to each other. The outlet terminal 35 includes a second base plate 351 and a second terminal plate 352 connected perpendicularly to each other. The base plate is horizontal, and the terminal plate is vertical. Both lead terminals are composed of conductive and insulating materials, but their structures and installation positions differ. The first terminal plate 342 and the second terminal plate 352 are used to install in the first mounting groove 36, and the first base plate 341 and the second base plate 351 are used to install in the second mounting groove 37. The first base plate 341 of the inlet terminal 34 is installed at the bottom of the first terminal plate 342, and the two are of the same length. The second base plate 351 of the outlet terminal 35 is embedded in the bottom side of the second terminal plate 352. One side of the second base plate 351 is designed with a slope to prevent mechanical damage to the outgoing superconducting tape. The terminal blocks of the two lead terminals have lead holes, and the top of the two terminal blocks also has mounting plates, wherein the mounting plate of the inlet terminal 34 has mounting holes.

[0037] The superconducting coil frame 3 is connected and installed to the counter pole core 22, as follows: Figure 3 As shown, the superconducting coil frame 3 has a pair of mounting ears 38 on the side of the first flange 31 / second flange 32, through which the superconducting coil frame 3 is mounted to the counter pole core 22. Correspondingly, the counter pole core 22 has mounting holes.

[0038] The iron core 2 is installed using a bolt connection, such as... Figure 1 and 6 As shown, four connecting feet 23 are located on the lower side of the toroidal core 21, and four supports 5 are correspondingly arranged on the bottom of the liquid nitrogen temperature zone. The connecting feet 23 and supports 5 have bolt holes. The core 2 is preferably made of electrical pure iron DT4 material, and the superconducting coil is preferably made of second-generation high-temperature superconducting tape YBCO. The size of the core 2 and the number of turns of the superconducting coil in each set of superconducting coil frames 3 can be specifically set according to the requirements of the billet heating power and the target time. One or more sets of superconducting coil frames 3 can be set according to actual needs. When there are multiple sets, they are installed side by side. The number of superconducting coil frames 3 can be adjusted by setting the inner diameter of the toroidal core 21 and the width and spacing of the pole cores 22.

[0039] In the embodiments provided by this invention, the liquid nitrogen container 1 is supported by S30408 ​​stainless steel material, such as... Figure 1 and 6As shown, it serves two purposes: cooling the superconducting coil and supporting the iron core 2. The container forms two ambient temperature zones: an internal 77K liquid nitrogen temperature zone and a room temperature zone for heating the central heating rod 4. The size of the room temperature zone is determined according to the diameter of the heating rod 4. The 77K liquid nitrogen temperature zone is primarily supplied by liquid nitrogen cooling, while the room temperature zone of the heating rod 4 is exposed to air, maintaining a room temperature environment. To avoid heat exchange and convection, the annular cavity wall of the liquid nitrogen container 1 is constructed as a vacuum jacket 12. After liquid nitrogen is injected into the liquid nitrogen temperature zone, no additional energy input is required; the cooling energy is provided by the liquid nitrogen. The heating rod 4 is preferably made of aluminum.

[0040] To ensure a low-temperature environment inside the container and reduce internal and external heat convection, the sidewall of liquid nitrogen container 1 has two layers, forming a vacuum interlayer 12.

[0041] The liquid nitrogen container 1 has a cover plate 11 on its top. The current lead port is installed on the cover plate 11, including an inlet port 111 and an outlet port 112. The inlet port 111 is used to connect to the inlet terminal 34, and the outlet port 112 is used to connect to the outlet terminal 35. The current lead port is made of copper, and the insulating material is made of epoxy resin, which serves to insulate and fix the lead terminal.

[0042] The working principle of this superconducting magnet structure is as follows: The lead terminals are fixed to the grooves (core 33) of the superconducting coil frame 3 with bolts and insulated with epoxy board. The superconducting tape terminals are welded to the lead terminals, the coil is wound, and the leads are welded out. The entire coil is installed on the counter pole core 22 and fixed with bolts to prevent movement due to electromagnetic force. The counter pole core 22 and the toroidal core 21 are installed in the liquid nitrogen container 1 at room temperature. To prevent movement of the core 2, it is bolted to the bottom support 5. The counter pole core 22 and the annular room temperature chamber of the liquid nitrogen container 1 are kept on the same axis, and the current leads are connected to the lead terminals on the superconducting coil frame 3. The cover plate 11 on top of the container is installed, liquid nitrogen is injected through the liquid nitrogen injection port, and the container is allowed to stand for 5 minutes until the internal environment reaches 77K before current is introduced.

[0043] In summary, this invention provides a DC induction-heated counter-polarity superconducting magnet structure, which is composed of a liquid nitrogen container, an iron core, a superconducting coil frame, a superconducting coil, a counter-polarity center heating rod, and current lead ports. The components are connected by bolts, and the number of counter-polarity iron core coils and the number of strip turns can be increased according to the magnetic field requirements within the air gap. The iron core of the novel superconducting magnet is made of electrical pure iron DT4 material, used to support the coil and guide the magnetic circuit; the coil frame is made of aluminum alloy material to reduce the magnet's weight and for winding the coil; the superconducting strip (coil) is made of second-generation high-temperature superconducting strip YBCO; the liquid nitrogen container is made of S30408 ​​stainless steel material to prevent magnetization and provide a low-temperature operating environment for the superconducting magnet. The size of the iron core and the number of coils can be specifically set according to the heating power of the blank and the target time requirements. The superconducting magnet is placed inside the liquid nitrogen container, and copper lead terminals are added to the coil frame for welding the superconducting strip and for passing current in the same direction to increase the magnet density within the air gap. The number of the superconducting magnet frame and its coils is not limited to... Figure 1 The single coil frame can be configured in different quantities according to actual needs.

[0044] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of one embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing the present invention.

[0045] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for apparatus or system embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. The apparatus and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0046] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A DC induction heating counter-polarity superconducting magnet structure, characterized in that, Includes liquid nitrogen container, iron core, superconducting coil frame, superconducting coil, counter-polarity heating rod, and current lead port; The liquid nitrogen container has a liquid nitrogen temperature zone and a heating room temperature zone. The heating room temperature zone is connected to the external room temperature environment. The iron core, superconducting coil, and superconducting coil frame are located within the heating room temperature zone. The superconducting coil is wound on the superconducting coil frame, which is connected to the iron core. The superconducting coil frame has lead terminals, and both ends of the superconducting coil are connected to the lead terminals. The lead terminals are also connected to the current lead port. The current lead port is also used for electrical connection to an external power source. The counter-polarity heating rod passes through the superconducting coil. The liquid nitrogen temperature zone is formed by injecting liquid nitrogen, which makes the iron core, superconducting coil and superconducting coil frame located in the heating room temperature zone form a high-temperature superconducting magnet. The core includes a toroidal core and a pair of opposing pole cores, with the opposing pole cores arranged opposite each other on the inner wall of the toroidal core; the toroidal core is installed laterally in the heating room temperature zone, and the gap between the cavity of the toroidal core and the opposing pole core is used to accommodate the superconducting coil frame and the superconducting coil. The superconducting coil frame includes a first flange, a core, and a second flange. The first flange and the second flange are connected to each other at intervals through the core. The outer diameter of the core is smaller than the outer diameter of the first flange and the second flange. The superconducting coil is wound around the outside of the core. The superconducting coil frame has an axially penetrating cavity for accommodating the counter electrode center heating rod. The first flange and the second flange have a first mounting groove for connecting the lead terminal. The outer side of the core also has a second mounting groove; the lead terminal has an L-shaped structure, including an inlet terminal and an outlet terminal; the inlet terminal includes a first base plate and a first terminal plate connected perpendicularly to each other, and the outlet terminal includes a second base plate and a second terminal plate connected perpendicularly to each other. The first terminal plate and the second terminal plate are used to be installed in the first mounting groove, and the first base plate and the second base plate are used to be installed in the second mounting groove. The first terminal plate and the second terminal plate have lead holes, and one side of the second base plate has a bevel. The liquid nitrogen container has a cylindrical structure. The liquid nitrogen temperature zone is located at the top of the liquid nitrogen container, and the heating room temperature zone is located at the bottom of the liquid nitrogen container. The top of the liquid nitrogen container has a removable cover plate. The current lead port is installed on the cover plate and includes an inlet port and an outlet port. The inlet port is used to connect to the inlet terminal, and the outlet port is used to connect to the outlet terminal.

2. The counter-polarity superconducting magnet structure according to claim 1, characterized in that, The liquid nitrogen container has a vacuum jacket inside its sidewall.

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