Experimental device for transverse compression experiment of superconducting CORC cable

Abstract

The invention discloses an experimental device for a transverse compression experiment of a superconducting CORC cable. The experimental device comprises an experimental platform; the supporting plate is mounted on the experimental platform; the lead wire compression assembly is mounted below the supporting plate, is externally connected with an electric wire, and is used for clamping the superconducting CORC cable, electrifying the superconducting CORC cable and applying pressure to the superconducting CORC cable; the low-temperature medium container is installed on the experiment platform in a lifting mode, located under the lead compression assembly and used for cooling the superconducting CORC cable; and the servo motor is mounted above the supporting plate, is connected with the lead compression assembly and is used for providing power for the lead compression assembly. The lifting low-temperature medium container can automatically control the device to be immersed in low-temperature liquid, manual participation is avoided, the container can be automatically lifted to enable the core part to be immersed in the low-temperature liquid, the pressure applied to the superconducting CORC cable through the servo motor is accurately controlled, errors are small, and the working efficiency is high. And the regression rule of the critical current of the superconducting CORC cable under the external compression stress can be researched more conveniently.

Description

Technical Field

[0001] The invention relates to the technical field of superconducting cables, and in particular to an experimental device for a transverse compression experiment of a superconducting CORC cable. Background Art

[0002] When the current is lower than the critical current of the strip, its resistance is close to zero, and each superconducting strip can pass a current of hundreds of amperes. Therefore, we can increase the current carrying capacity by winding as many superconducting strips as possible on the copper rod, thereby designing a superconducting CORC cable with a high current density. Superconducting CORC cables are widely used in many occasions that require large currents and strong magnetic fields due to their ultra-high current density and higher operating temperature than traditional low-temperature superconducting cables. The magnet coils for controlled nuclear fusion require tens of thousands of amperes of current to confine high-temperature plasma. Superconducting CORC cables provide a possibility for coil winding with their high current density and good bending properties.

[0003] The superconducting tape of superconducting CORC cable is a ceramic material, which is sensitive to external stress. Under huge external compressive stress, the critical current may have a large decline. The critical current is an important parameter for measuring superconducting cables. When this parameter is exceeded, the cable is considered to be quenched. However, the specific current decline law of superconducting CORC cables under compressive stress is still under study. Therefore, an experimental device for transverse compression experiment of superconducting CORC cables is urgently needed to study the decline law of critical current of superconducting CORC cables under external compressive stress. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention designs an experimental device for a lateral compression experiment of a superconducting CORC cable, comprising: an experimental platform; a support plate installed on the experimental platform; a lead compression assembly installed below the support plate and externally connected to an electric wire, used for clamping the superconducting CORC cable, energizing the superconducting CORC cable, and applying pressure to the superconducting CORC cable; a low-temperature medium container, which can be raised and lowered on the experimental platform and is located directly below the lead compression assembly, and is used for cooling the superconducting CORC cable; and a servo motor, which is installed above the support plate and connected to the lead compression assembly, and is used for providing power to the lead compression assembly.

[0005] Preferably, the lead compression assembly includes: a support rod installed below the support plate; two fixed discs, respectively installed at the middle and bottom of the support rod; two current lead assemblies, symmetrically installed on both sides of the fixed disc and externally connected to wires, used to clamp the superconducting CORC cable and energize the superconducting CORC cable; and a cable compression assembly connected to a servo motor, used to apply pressure to the superconducting CORC cable.

[0006] Preferably, the fixed disc includes: a disc body; a first through hole, arranged on the disc body, for passing the support rod; two current lead assembly fixing surfaces, symmetrically arranged on both sides of the disc body, for installing the current lead assembly; a fixing hole, arranged on the disc body and located on the side of the first through hole, for passing a bolt and fixing the disc body to the support rod.

[0007] Preferably, the fixed disc further comprises: a second through hole, provided on the disc body, for passing the cable compression assembly.

[0008] Preferably, the current lead assembly includes: a current lead; an external wire hole, which is arranged at the top of the current lead and is used for external wire connection; two fixing rods, which are respectively fixed to the middle and bottom of the current lead and are respectively fixedly connected to two fixing discs; a cable clamp, which is arranged between the two fixing rods and fixedly installed on the current lead, and is used for clamping the superconducting CORC cable and energizing the superconducting CORC cable.

[0009] Preferably, the cable compression assembly includes: a pressure telescopic rod connected to the servo motor; a first compression member installed at the bottom of the pressure telescopic rod and located above the superconducting CORC cable; a second compression member installed on a fixed disk located at the bottom of the support rod and located below the superconducting CORC cable, cooperating with the first compression member to apply pressure to the superconducting CORC cable.

[0010] Preferably, the first compression member includes: a first load pressure block installed at the bottom of the pressure telescopic rod and located above the superconducting CORC cable; a fixing frame used to connect the first load pressure block and the pressure telescopic rod; and a limiting hole provided at the top of the first load pressure block to prevent the pressure telescopic rod from deviating.

[0011] Preferably, the second compression member comprises: a second load pressing block mounted on a fixed disc at the bottom of the support rod; and a cable placement groove arranged on the top of the second load pressing block for placing the superconducting CORC cable.

[0012] Preferably, the experimental platform includes: a support frame, a support plate is installed on the support frame; a lifting plate, which is installed on the support frame in a liftable manner and is located below the support plate, and the low-temperature medium container is installed on the lifting plate.

[0013] Compared with the closest prior art, the beneficial effects of the present invention are: 1. The present invention is used to connect a servo motor 2 through an external control system to achieve precise control of the pressure applied to the superconducting CORC cable, with a small error within ±0.5 kN / m. The precise given pressure makes the experimental data more accurate, and is more convenient to study the degradation law of the critical current of the superconducting CORC cable under external compressive stress. The degradation law is more accurate, and the situation of cable quenching in actual use of the superconducting CORC cable is reduced, and the situation of irreversible damage to the superconducting CORC cable in actual use is reduced.

[0014] 2. The present invention is used for a liftable cryogenic medium container that can automatically control the device to be immersed in the cryogenic liquid. There is no need to manually place the superconducting CORC cable directly into the cryogenic liquid, which avoids manual participation in the automatic lifting of the container to immerse the core part in the cryogenic liquid, greatly improving the safety of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the experimental device of the present invention.

[0016] Figure 2 It is a schematic structural diagram of the lead compression assembly of the present invention.

[0017] Figure 3 It is a schematic diagram of the structure of the fixed disc of the present invention.

[0018] Figure 4 It is a schematic structural diagram of the current lead assembly of the present invention.

[0019] Figure 5 It is a schematic structural diagram of the first compression element of the present invention.

[0020] Figure 6 It is a schematic structural diagram of the second compression element of the present invention.

[0021] Reference numerals: 1-support plate, 2-servo motor, 3-lead compression assembly, 31-pressure telescopic rod, 32-support rod, 33-fixed disc, 331-disc body, 332-first through hole, 333-second through hole, 334-current lead assembly fixing surface, 335-fixing hole, 34-current lead assembly, 341-current lead, 342-fixing rod, 343-cable clamping piece, 344-external wire hole, 35-first compression piece, 351-first load pressure block, 352-fixing frame, 353-limiting hole, 36-second compression piece, 361-second load pressure block, 362-cable placement groove, 4-low temperature medium container. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0023] like Figure 1-Figure 6 As shown, the present invention provides an experimental device for a lateral compression experiment of a superconducting CORC cable, comprising: an experimental platform. A support plate 1 is installed on the experimental platform. A lead compression assembly 3 is installed below the support plate 1 and is connected to an external wire for clamping the superconducting CORC cable, energizing the superconducting CORC cable, and applying pressure to the superconducting CORC cable. A cryogenic medium container 4 is installed on the experimental platform in a liftable manner and is located directly below the lead compression assembly 3 for cooling the superconducting CORC cable. A servo motor 2 is installed above the support plate 1 and connected to the lead compression assembly 3 for providing power to the lead compression assembly 3. Since the superconducting CORC cable must be immersed in a cryogenic medium to exert its superconducting performance, and the lead compression assembly 3 connected to the cable has better flow performance at low temperatures, it is necessary to immerse the core experimental part in a cryogenic medium for the experiment. The cryogenic medium container 4 is used to install a cryogenic liquid medium. The cryogenic medium container 4 is a hollow rectangular container made of high-purity steel. The cryogenic medium container 4 is installed on the experimental platform in a liftable manner. The experimental platform can realize the free lifting and lowering of the cryogenic medium container 4 by connecting to an external control system. The lead compression assembly 3 is located directly above the cryogenic medium container 4. During the test, the cooling liquid medium is first loaded into the cryogenic medium container 4, and then the cryogenic medium container 4 is lifted by the control system until the liquid level covers the superconducting CORC cable. At this time, the low-temperature immersion of the superconducting CORC cable is completed. After the test is completed, the cryogenic medium container 4 is controlled to descend by the control system. At this time, the superconducting CORC cable part is separated from the cryogenic medium container 4, and sufficient space is generated to recover the liquid cooling medium. In order to fully immerse and cool the superconducting CORC cable of the experimental part, the height of the cryogenic medium container 4 is not less than 1.5 times the part that needs to be immersed; in order to ensure the safety of the experimental process, the wall thickness of the cryogenic medium container 4 is not less than 30mm. The liftable cryogenic medium container can automatically control the device to be immersed in the cryogenic liquid, and there is no need to manually put the superconducting CORC cable directly into the cryogenic liquid, avoiding manual participation in the automatic lifting container to immerse the core part in the cryogenic liquid, which greatly improves the safety of the device.

[0024] Preferably, the lead compression assembly 3 includes: a support rod 32, which is installed below the support plate 1. There are two fixed discs 33, which are respectively installed in the middle and bottom of the support rod 32. There are two current lead assemblies 34, which are symmetrically installed on both sides of the fixed disc 33 and are connected to external wires for clamping the superconducting CORC cable and energizing the superconducting CORC cable. The cable compression assembly is connected to the servo motor 2 and is used to apply pressure to the superconducting CORC cable. Since the current lead assembly 34 and the cable compression assembly are both suspended in the air, a force-bearing platform with sufficient strength is required to support the pressure of the cable compression assembly and fix the current lead assembly 34. There are four support rods 32, which are four relatively long solid steel rods. The two fixed discs 33 are placed horizontally up and down, the lower fixed disc 33 is aligned with the bottom of the current lead assembly 34, and the upper fixed disc 33 is aligned with the middle of the current lead assembly 34, wherein the upper fixed disc 33 is fixedly connected to the support rod 32 by bolts, and after the lower fixed disc 33 is fixedly connected to the support rod 32 by bolts, a limit nut is set under the lower fixed disc 33 to increase its stability.

[0025] Preferably, the fixed disc 33 includes: a disc body 331. A first through hole 332 is provided on the disc body 331 for passing the support rod 32. Two current lead assembly fixing surfaces 334 are symmetrically provided on both sides of the disc body 331 for installing the current lead assembly 34. A fixing hole 335 is provided on the disc body 331 and is located on the side of the first through hole 332 for passing bolts and fixing the disc body 331 to the support rod 32. There are four first through holes 332, and four first through holes 332 are provided on the disc body 331 for passing four support rods 32, and the disc body 331 is fixedly connected to the support rod 32 by the fixing holes 335 located on the side of the first through holes 332, which greatly increases the stability of the device. The fixed disc 33 also includes: a second through hole 333, provided on the disc body 331 for passing the cable compression assembly. A second through hole 333 is provided on the upper fixing disc 33 for passing the cable compression assembly.

[0026] Preferably, the current lead assembly 34 includes: a current lead 341. An external wire hole 344 is provided at the top of the current lead 341 for externally connecting wires. Two fixing rods 342 are respectively fixed to the middle and bottom of the current lead 341 and are respectively fixedly connected to the two fixing discs 33. A cable clamp 343 is provided between the two fixing rods 342 and fixedly mounted on the current lead 341 for clamping the superconducting CORC cable and energizing the superconducting CORC cable. The current lead 341 adopts a rectangular copper rod for introducing external current into the cable clamp 343. Since the test current may be large, the cross-section of the rectangular copper rod is appropriately increased. The fixing rod 342 is used to fix the current lead 341 on the fixing disc 33. The cable clamp 343 is a hollow copper cylinder and is symmetrically divided into two parts. The two parts cooperate to clamp the end of the superconducting CORC cable, and the current is introduced into the superconducting CORC cable by the cable clamp 343. The hollow inner diameter of the hollow cylinder is 1-2 mm smaller than the diameter of the end of the superconducting CORC cable, so that it is tighter and has lower resistance during mechanical matching. One half of the cable clamp 343 is fixed on the current lead 341 to achieve the effect of connecting the cable clamp 343 with the current lead 341. During testing, the end of the superconducting CORC cable is set in the hollow of the semi-cylinder, and the other hollow semi-cylinder is covered on the end of the superconducting CORC cable. The two semi-hollow cylinders are mechanically matched through the screw hole, and a complete current path from the current lead to the cable assembly end to the cable is formed.

[0027] Preferably, the cable compression assembly includes: a pressure telescopic rod 31, which is connected to the servo motor 2. A first compression member 35 is installed at the bottom of the pressure telescopic rod 31 and is located above the superconducting CORC cable. A second compression member 36 is installed on a fixed disc 33 located at the bottom of the support rod 32 and is located below the superconducting CORC cable, and cooperates with the first compression member 35 to apply pressure to the superconducting CORC cable. The pressure load block is divided into a first compression member 35 and a second compression member 36, wherein the second compression member 36 is installed at the center of the fixed disc 33 below, the top of the first compression member 35 is connected to the pressure telescopic rod 31, and the superconducting CORC cable is located between the first compression member 35 and the second compression member 36. The other end of the pressure telescopic rod 31 passes through the second through hole 333 opened on the upper fixed disc 33 and is connected to the servo motor 2. The servo motor 2 drives the first compression member 35 to press down by giving a pressure through an external control system. The pressure applied to the superconducting CORC cable is precisely controlled by connecting the servo motor 2 through an external control system, with a small error within ±0.5kN / m. The precise given pressure makes the experimental data more accurate, and it is more convenient to study the degradation law of the critical current of the superconducting CORC cable under external compressive stress. The degradation law is more accurate, which reduces the occurrence of cable quenching in actual use of the superconducting CORC cable and the irreversible damage caused by the superconducting CORC cable in actual use. Moreover, with the intervention of the external control system, pressure control can be achieved by simply inputting a given pressure, without relying on complex manual operations, reducing manual intervention, and achieving precise application of pressure.

[0028] Preferably, the first compression member 35 comprises: a first load pressing block 351, which is installed at the bottom of the pressure telescopic rod 31 and is located above the superconducting CORC cable; a fixing frame 352, which is used to connect the first load pressing block 351 and the pressure telescopic rod 31; and a limiting hole 353, which is provided at the top of the first load pressing block 351, which is used to prevent the pressure telescopic rod 31 from deflecting.

[0029] Preferably, the second compression member 36 comprises: a second load pressing block 361, mounted on a fixed disc 33 at the bottom of the support rod 32. A cable placement groove 362, arranged on the top of the second load pressing block 361, for placing a superconducting CORC cable.

[0030] Preferably, the experimental platform comprises: a support frame, on which the support plate 1 is mounted; a lifting plate, which is escalably mounted on the support frame and is located below the support plate 1, and the cryogenic medium container 4 is mounted on the lifting plate.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0032] In addition, the terms "above" and "below" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "above" and "below" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. An experimental device for transverse compression experiment of superconducting CORC cable, characterized in that: include: Experimental platform; A support plate, mounted on the experimental platform; A lead compression assembly is installed below the support plate and is externally connected to an electric wire, and is used to clamp the superconducting CORC cable, energize the superconducting CORC cable, and apply pressure to the superconducting CORC cable; A low-temperature medium container, which can be lifted and installed on the experimental platform and is located directly below the lead compression assembly, and is used to cool the superconducting CORC cable; The servo motor is installed above the support plate and connected to the lead compression assembly to provide power to the lead compression assembly.

2. The experimental device for the transverse compression experiment of superconducting CORC cables according to claim 1, characterized in that: The lead compression assembly comprises: A support rod, installed below the support plate; Two fixed discs are installed at the middle and bottom of the support rod respectively; Two current lead assemblies are symmetrically mounted on both sides of the fixed disc and connected with external wires, and are used to clamp the superconducting CORC cable and energize the superconducting CORC cable; The cable compression assembly is connected to the servo motor and is used to apply pressure to the superconducting CORC cable.

3. The experimental device for the transverse compression experiment of superconducting CORC cables according to claim 2, characterized in that: The fixed disc comprises: Disc body; A first through hole, provided on the disc body, for passing the support rod; Two current lead assembly fixing surfaces are symmetrically arranged on both sides of the disc body and are used to install the current lead assembly; A fixing hole is provided on the disc body and is located on the side of the first through hole, and is used for passing a bolt and fixing the disc body to the support rod.

4. The experimental device for the transverse compression experiment of superconducting CORC cables according to claim 3, characterized in that: The fixed disc also includes: A second through hole is provided on the disc body and is used for passing the cable compression assembly.

5. The experimental device for the transverse compression experiment of superconducting CORC cables according to claim 2, characterized in that: The current lead assembly comprises: Current leads; An external wire hole, arranged on the top of the current lead, for externally connecting a wire; Two fixing rods are fixed to the middle and bottom of the current lead respectively, and are fixedly connected to the two fixing discs respectively; The cable clamp is arranged between the two fixing rods and fixedly mounted on the current lead, and is used for clamping the superconducting CORC cable and energizing the superconducting CORC cable.

6. The experimental device for the transverse compression experiment of superconducting CORC cables according to claim 2, characterized in that: Cable Compression Assemblies Include: A pressure telescopic rod connected to a servo motor; A first compression member is installed at the bottom of the pressure telescopic rod and is located above the superconducting CORC cable; The second compression member is mounted on a fixed disc at the bottom of the support rod and is located below the superconducting CORC cable, and cooperates with the first compression member to apply pressure to the superconducting CORC cable.

7. The experimental device for the transverse compression experiment of superconducting CORC cables according to claim 6, characterized in that: The first compression member comprises: A first load pressing block is installed at the bottom of the pressure telescopic rod and is located above the superconducting CORC cable; A fixing frame, used for connecting the first load pressing block and the pressure telescopic rod; A limiting hole is arranged on the top of the first load pressing block and is used to prevent the pressure telescopic rod from deviating.

8. The experimental device for the transverse compression experiment of superconducting CORC cables according to claim 6, characterized in that: The second compression member comprises: A second load pressing block is mounted on a fixed disc at the bottom of the support rod; The cable placement groove is arranged on the top of the second load pressing block and is used for placing the superconducting CORC cable.

9. The experimental device for transverse compression experiment of superconducting CORC cable according to any one of claims 1 to 8, characterized in that: The experimental platform includes: A support frame, wherein the support plate is mounted on the support frame; A lifting plate is installed on the support frame in a liftable manner and is located below the support plate. The low-temperature medium container is installed on the lifting plate.

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