Connector box for superconductor and superconductor assembly

Abstract

The utility model provides a connector box for a superconducting conductor and a superconducting conductor assembly, the connector box comprises a splitter plate which is arranged in an inner cavity of a box body and extends along the length direction, and two sides of the splitter plate are respectively connected with side walls of the box body except a first side wall with a conductive wall; the first outer surface of the splitter plate and the inner wall surfaces of the other side walls of the box body jointly form a cooling medium flow channel, the second outer surface of the splitter plate, the other side walls of the box body and the first side wall jointly form a containing cavity, and a cable connecting part of the superconducting conductor is arranged in the containing cavity and connected between the splitter plate and the first side wall in a pressed mode; and the cooling medium flow channel is communicated with the accommodating cavity, so that the cooling medium in the accommodating cavity can be conveyed into the cooling medium flow channel. The superconducting conductor joint manufactured by the joint box realizes the low contact resistance effect, the cooling medium flows in the cooling medium flow channel to ensure the cooling effect, and quenching of the superconducting conductor joint can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to superconducting technical field, especially relate to a joint box for superconducting conductor and superconducting conductor assembly with the joint box. BACKGROUND

[0002] Large superconducting magnet systems, such as International Thermonuclear Experimental Reactor (ITER), nuclear fusion device, large particle accelerator, etc. generally adopt cable-in-conduit conductor (cable-in-conduit conductor, hereinafter referred to as CICC conductor). The CICC conductor is a composite structure conductor formed by wrapping a plurality of superconducting cables in a metal sheath tube. When running, a low-temperature cooling medium such as supercritical helium needs to flow through the metal sheath tube to realize superconducting state and magnet cooling. In large magnets, the length of a single CICC conductor is limited, and multiple conductors must be reliably electrically connected through superconducting conductor joints to form a complete closed coil. Therefore, the superconducting conductor joint is an indispensable key component in the superconducting magnet. Its performance is directly related to the operating efficiency, stability and economy of the entire magnet system.

[0003] An ideal superconducting conductor joint needs to meet two important performance indicators: (1) low connection resistance: in the superconducting state, the resistance at the superconducting conductor joint should be as low as possible (usually required to reach nΩ order of magnitude or even lower) to reduce joule heat loss, avoid local thermal runaway and reduce the operating energy consumption of the magnet; (2) low flow resistance: the structure of the superconducting conductor joint should as little as possible hinder the flow of the cooling medium in the conductor to ensure that the coolant can fully and uniformly flow through all the strands to provide effective cooling and timely remove the heat generated by the joint itself.

[0004] At present, the preparation method of the joint of the CICC conductor includes peeling off the superconducting cables of the superconducting conductors at both ends from the sheath tube, removing the surface plating layer and then inserting them into the joint box (or extruded connector) of the composite metal, and then solidifying and electrically connecting through welding, low-temperature brazing or isostatic pressing. However, the superconducting conductor joint prepared by this method has the problem of difficult trade-off between "resistance-flow resistance": if the cable bundle is formed into a loose porous structure, the flow resistance can be reduced, and the cooling medium can flow smoothly, but the contact between the strands will be poor, and the contact resistance will increase; in order to pursue low contact resistance, the cable bundle can be highly compressed during preparation to increase the contact area and contact pressure between the strands and reduce the contact resistance, but this will cause the pores between the cable strands to be severely squeezed, forming a dense and tortuous flow channel, greatly increasing the flow resistance of the cooling medium, reducing the cooling effect and increasing the risk of quenching of the superconducting conductor joint. UTILITY MODEL CONTENTS

[0005] The utility model discloses a purpose at solving the existing superconductive conductor joint " resistance-flow resistance " difficult to balance, when reducing contact resistance, can occur the problem of reducing cooling effect.

[0006] To solve the above technical problem, the utility model discloses an implementation mode of a kind of joint box for superconductive conductor, superconductive conductor includes superconducting cable and armour, armour is wrapped in the outer circumferential side of superconducting cable, superconducting cable includes cable connecting part that stretches out armour, joint box includes: box body, the first end of box body is provided with opening along its length direction, the first side wall of box body is at least partial area along its length direction and is set as conductive wall;Shunt plate, shunt plate is set in the inner chamber of box body, and it extends along the length direction of box body, the two sides of shunt plate along its width direction respectively with the other side wall except the first side wall of box body is connected;Wherein, the first outer surface along its thickness direction of shunt plate and the inner wall surface of other side wall of box body jointly define the cooling medium flow channel, the second outer surface along its thickness direction of shunt plate and the inner wall surface of other side wall of box body, the inner wall surface of first side wall jointly define the accommodating cavity, first outer surface and second outer surface are oppositely arranged in the thickness direction of shunt plate, cooling medium flow channel and accommodating cavity all extend along the length direction of box body;And, opening is used for cable connecting part to pass through and enter accommodating cavity, and is crimped between the second outer surface of shunt plate and the inner wall surface of first side wall of box body, and the conductive wall of box body is electrically connected with cable connecting part, the end surface of the first end of box body is connected with the end surface of armour;And cooling medium flow channel is communicated with accommodating cavity, so that the cooling medium in accommodating cavity can be transported into cooling medium flow channel, the second end of box body is used for being connected with cooling medium pipe, so that accommodating cavity is communicated with cooling medium pipe.

[0007] Adopt the above technical scheme, by setting shunt plate in box body, the compression force of joint box outer wall can be transmitted to cable connecting part through shunt plate, guarantee the low porosity high density of cable connecting part, increase the contact area between cable connecting part strand and between cable and joint box conductive wall, reduce the contact resistance of joint;And when cable connecting part is crimped into accommodating cavity, the cooling medium such as supercritical liquid helium between cable connecting part gap enters cooling medium flow channel, at least one side of the outer circumferential of superconductive conductor joint has cooling medium, reduce the resistance of cooling medium flow in superconductive conductor joint part, guarantee the cooling effect of superconductive conductor joint. The superconductive conductor joint obtained by adopting the joint box of the utility model realizes low contact resistance effect, and the cooling medium flowing in cooling medium flow channel guarantees cooling effect, so that the quench of superconductive conductor joint can be avoided.

[0008] According to another specific embodiment of the utility model, the utility model discloses a kind of joint boxes for superconducting conductor, multiple through holes spaced apart are provided on the shunt plate, each of the multiple through holes extends from the first outer surface of the shunt plate to the second outer surface, so that the cooling medium can pass through the multiple through holes between the cooling medium flow channel and the accommodating cavity.

[0009] With the above technical solution, when the cooling medium enters the cooling medium flow channel, it can also pass through the multiple through holes and the cable connection part. This not only ensures the cooling effect but also reduces the flow resistance of the cooling medium in the cable connection part, avoiding uneven flow distribution in the superconducting magnet cooling channel and the occurrence of heat exchange dead zones.

[0010] According to another specific embodiment of the utility model, the utility model discloses a kind of joint boxes for superconducting conductor, multiple through holes are arranged in an array in the length direction and the width direction of the shunt plate;From one end to the other end of the shunt plate along its length direction, the multiple through holes are arranged into multiple rows.

[0011] With the above technical solution, the cable connection part in the accommodating cavity and the cooling medium flow channel are uniformly interconnected in the length direction of the entire box body, further ensuring the cooling effect.

[0012] According to another specific embodiment of the utility model, the utility model discloses a kind of joint boxes for superconducting conductor, the joint box further includes at least one rib, each rib is arranged in the cooling medium flow channel and extends along the length direction of the box body, and each rib is abutted with the first outer surface of the shunt plate on one side along the width direction, and is fixedly connected with the inner wall surface of the other side wall of the joint box.

[0013] With the above technical solution, at least one rib is supported on the first outer surface of the shunt plate, which plays a role in evenly applying pressure to the cable connection part, and at the same time, the cooling medium flow channel is divided into multiple parallel arrangements.

[0014] According to another specific embodiment of the utility model, the utility model discloses a kind of joint boxes for superconducting conductor, each rib extends from the first end to the second end of the box body, and the end portion close to the second end is spaced apart from the second end;There are multiple ribs, and the multiple ribs are spaced apart and parallel to each other in the width direction of the shunt plate.

[0015] With the above technical solution, the structure of the joint box is more stable and the pressure applied is more balanced.

[0016] According to another specific embodiment of the utility model, the utility model discloses an embodiment of the utility model discloses a joint box for superconducting conductor, and the end portion of cooling medium flow channel and containing cavity close to the second end is spaced apart from the second end, and the other side wall of the box body includes the second side wall, third side wall and fourth side wall that meet in turn along the circumference of the box body, and the first side wall meets between the second side wall and the fourth side wall and is arranged opposite the third side wall, and the inner wall surface of the second side wall and the fourth side wall meets the two sides of the flow distribution plate along its width direction respectively, and the first outer surface of the flow distribution plate is spaced apart from the third side wall and is jointly defined with the inner wall surface of the second side wall, third side wall and fourth side wall to form the cooling medium flow channel, and the second outer surface of the flow distribution plate is spaced apart from the first side wall and is jointly defined with the inner wall surface of the second side wall, first side wall and fourth side wall to form the containing cavity.

[0017] The containing cavity is shaped as a regular cuboid, which facilitates exerting uniform pressure on the cable connecting part in the containing cavity and keeping the cable connecting part at a certain porosity.

[0018] According to another specific embodiment of the utility model, the utility model discloses an embodiment of the utility model discloses a joint box for superconducting conductor, and the box body includes a first shell, a second shell and an end cover, the first shell and the second shell are fixedly connected through welding and jointly constitute the first side wall and other side walls of the box body, and the end cover is fixedly connected with one end of the first shell and the second shell through welding respectively, wherein the second shell includes the first side wall and the lower half of the two side walls adjacent to the first side wall, the flow distribution plate is arranged in the first shell, and the two end covers form the second end of the box body.

[0019] The above technical scheme is simple to operate and stable in structure when manufacturing the superconducting conductor joint.

[0020] The embodiment of the utility model further discloses a superconducting conductor assembly, and the cable connecting part of the first superconducting conductor and the cable connecting part of the second superconducting conductor are fixedly connected and form a superconducting conductor joint, the superconducting conductor joint includes the cable connecting part of the first superconducting conductor, the cable connecting part of the second superconducting conductor and two joint boxes provided by the utility model, the cable connecting part of the first superconducting conductor extends into the containing cavity through the opening of one of the joint boxes, the cable connecting part of the second superconducting conductor extends into the containing cavity through the opening of the other joint box, the outer wall surface of the first side wall of the two joint boxes is arranged opposite and connected in the direction perpendicular to the length direction of the joint box, and the conductive walls of the two joint boxes are connected, so that the cable connecting part of the first superconducting conductor and the cable connecting part of the second superconducting conductor can be electrically connected through the conductive walls of the two joint boxes.

[0021] The superconducting conductor joint of the superconducting conductor assembly can realize low contact resistance effect while ensuring cooling effect, and can avoid quench of the superconducting conductor joint.

[0022] According to another specific embodiment of the utility model, the superconducting conductor assembly disclosed by the embodiment of the utility model has a cable connecting part in the superconducting conductor joint, and the porosity of the cable connecting part is 20%-25%.

[0023] The above technical solution can ensure that the superconducting cable maintains extremely low contact resistance without being damaged.

[0024] According to another specific embodiment of the utility model, the superconducting conductor assembly disclosed by the embodiment of the utility model has a cable connecting part in the superconducting conductor joint, and the outer periphery of the cable connecting part is a superconducting wire.

[0025] The above technical solution avoids that the surface of the cable connecting part has a metal plating layer, which affects the electrical contact of the cable connecting part and the conductive wall in the joint box.

[0026] Technical effects of the utility model: the superconducting conductor joint obtained by using the joint box of the utility model can realize low contact resistance effect while ensuring cooling effect of the cooling medium flowing in the cooling medium flow channel, and can avoid quench of the superconducting conductor joint. The technical problem that the contact resistance and the cooling medium flow resistance of the superconducting conductor joint are difficult to balance can be solved, the resistance of the cooling medium flowing at the superconducting conductor joint part can be significantly reduced under the premise of ensuring extremely low contact resistance, the operation reliability, stability and economy of the superconducting magnet under the condition of high current, large magnetic field and low temperature can be improved by using the joint box of the utility model to manufacture the superconducting conductor joint, and the utility model is particularly suitable for a nuclear fusion superconducting system with high stability and compactness requirements. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is an explosion structure schematic view of the connection relationship between the joint box for the superconducting conductor of the utility model and the superconducting conductor and the cooling medium pipe;

[0028] Figure 2 is a cross-sectional structure schematic view of the superconducting conductor assembly of the utility model (along the length direction cross section);

[0029] Figure 3 is a cross-sectional structure schematic view of the superconducting conductor assembly of the utility model (along the width direction cross section);

[0030] Figure 4 is a structure schematic view of one embodiment of the superconducting conductor assembly of the utility model;

[0031] Figure 5 is a structure schematic view of another embodiment of the superconducting conductor assembly of the utility model.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Junction box; 11. Box body; 111. First housing; 112. Second housing; 1121. First side wall; 1122. Second side wall; 1123. Third side wall; 1124. Fourth side wall; 113. End cap; 12. Diverter plate; 121. Through hole; 13. Cooling medium flow channel; 14. Rib; 15. Space; 2. Superconducting conductor; 21. Superconducting cable; 211. Cable connection part; 22. Armor; 23. First superconducting conductor; 24. Second superconducting conductor; 3. Cooling medium pipe. Detailed Implementation

[0034] The specific structure of the junction box and superconducting conductor assembly provided by this utility model will be described in detail below with reference to the accompanying drawings. Example 1

[0035] This embodiment provides a junction box for a superconducting conductor, wherein the junction box is used to form a superconducting conductor junction, and the superconducting conductor is a CICC superconducting conductor, such as... Figure 1 and Figure 2 As shown, the superconducting conductor 2 includes a superconducting cable 21 and an armor 22. The armor 22 wraps around the outer periphery of the superconducting cable 21 and is generally made of stainless steel. It serves to seal and protect the superconducting cable 21, while also withstanding electromagnetic forces and thermal stress. The superconducting cable 21 is the core component of the superconducting conductor 2, generally consisting of stranded superconducting wire and a metal plating layer on the surface of the superconducting wire. During operation, the superconducting cable 21 carries current. It should be noted that the superconducting conductor 2 can be circular or square. During operation, a cryogenic cooling medium such as supercritical helium flows within the armor 22 to achieve superconductivity and magnet cooling. A perforated metal tube or spiral can also be placed in the middle of the superconducting cable 21 as needed to allow coolant to pass quickly through the superconducting conductor 2. The portion of the superconducting conductor 2 used to connect with other superconducting conductors 2 to form a superconducting conductor joint requires the removal of the armor 22, forming a cable connection portion 211 extending out of the superconducting conductor 2, which is then placed in the junction box 1.

[0036] like Figures 1-3 As shown, the junction box 1 includes a box body 11 and a diverter plate 12; the first end of the box body 11 along its length direction ( Figure 1 An opening is provided on the left side of the box 11, allowing the cable connector 211 to pass through and extend into the box 11. The end face of the first end of the box 11 and the end face of the armor 22 can be connected by welding or other means; the second end of the box 11 ( Figure 1 The right side of the housing 11 is used for connection with the cooling medium pipe 3. The first side wall 1121 of the housing 11 ( Figure 1At least a portion of the lower middle section of the junction box 1 is configured as a conductive wall along its length. This conductive wall is used to electrically connect the cable connection portion 211 within the junction box 1 to the cable connection portion 211 of another superconducting conductor used to form a superconducting conductor connector. It is generally made of a material with low resistivity and high conductivity, such as silver, copper, or aluminum; in one specific embodiment, the conductive wall is made of oxygen-free copper. The first sidewall 1121 can be configured to be entirely conductive, or only partially conductive. Specifically, the first sidewall 1121 can be configured to be conductive except for a small portion near the superconducting conductor 2. It should be noted that the external shape of the box 11 can be as follows: Figure 1 The cuboid shape shown can also be a cylinder, prism, etc. For a cuboid or prism, different sidewalls refer to sidewalls extending along a plane; for a cylinder, different sidewalls refer to portions of the sidewalls facing a certain direction. In one specific embodiment, such as... Figure 3 As shown, the other sidewalls of the box 11 include a second sidewall 1122, a third sidewall 1123 and a fourth sidewall 1124 connected sequentially along the circumference of the box 11. The first sidewall 1121 is connected between the second sidewall 1122 and the fourth sidewall 1124 and is opposite to the third sidewall 1123; that is, the box 11 is a cuboid or a prism.

[0037] like Figures 1-3 As shown, the diverter plate 12 is disposed in the inner cavity of the housing 11, and along the length direction of the housing 11 ( Figure 1 Extending in the X direction, the splitter 12 extends along its width direction (perpendicular to the X direction). Figure 1 The two sides of the diversion plate 12 (in the X direction) are respectively connected to the other side walls of the box body 11, excluding the first side wall 1121. The first outer surface of the diversion plate 12 along its thickness direction ( Figure 1 The upper surface of the flow divider 12 and the inner wall surfaces of the other side walls of the housing 11 together define a cooling medium flow channel 13 for the flow of cooling media such as liquid helium; the second outer surface of the flow divider 12 along its thickness direction ( Figure 1 The lower surface of the diverter plate 12, together with the inner wall surface of the other side walls of the housing 11 and the inner wall surface of the first side wall 1121, together define a receiving cavity for accommodating the cable connection part 211; the first outer surface and the second outer surface are arranged opposite to each other in the thickness direction of the diverter plate 12, the cooling medium flow channel 13 and the receiving cavity both extend along the length direction of the housing 11, and the receiving cavity is connected to the cooling medium pipe 3.

[0038] The cable connector 211 enters the receiving cavity in the housing 11 through the opening at the first end and is pressed between the second outer surface of the diverter plate 12 and the inner wall surface of the first side wall 1121 of the housing 11, such that the porosity of the cable connector 211 is within a certain range, specifically 20%-25%; and the conductive wall of the housing 11 is connected to the cable connector 211. The cooling medium flow channel 13 communicates with the receiving cavity, allowing the cooling medium in the receiving cavity to be transported into the cooling medium flow channel 13, so that the coolant in the cable connector 211 in the receiving cavity can flow into the cooling medium flow channel 13.

[0039] This configuration, by setting a diversion plate 12 in the housing 11, can transfer the clamping force of the outer wall of the junction box 1 to the cable connection part 211, ensuring the low porosity and high density of the cable connection part 211, increasing the contact area between the strands of the cable connection part 211 and between the cable and the conductive wall of the junction box 1, and reducing the contact resistance of the superconducting conductor joint; and when the cable connection part 211 is pressed into the receiving cavity, the cooling medium such as supercritical liquid helium between the gaps of the cable connection part 211 enters the cooling medium flow channel 13, and the cooling medium flows on at least one side of the outer periphery of the superconducting conductor joint, reducing the resistance of the cooling medium flow at the superconducting conductor joint and ensuring the cooling effect of the superconducting conductor joint.

[0040] Specifically, the splitter plate 12 can be configured as follows: Figure 1 The straight plate shown can also be configured to have an L-shaped or U-shaped structure when viewed from one side along its length, so that the first outer surface of the diverter plate 12 (the outer surface of the L-shaped or U-shaped structure) forms a cooling medium flow channel 13 with the sidewalls in two or three opposite directions. In one specific embodiment, such as Figures 1-3 As shown, the other sidewalls of the box body 11 include a second sidewall 1122, a third sidewall 1123, and a fourth sidewall 1124 that are sequentially connected along the circumference of the box body 11. The first sidewall 1121 is connected between the second sidewall 1122 and the fourth sidewall 1124 and is disposed opposite to the third sidewall 1123. The flow divider 12 is a straight plate, and its two sides along its width direction abut against the inner wall surfaces of the second sidewall 1122 and the fourth sidewall 1124, respectively. The first outer surface of the flow divider 12 is disposed opposite to the third sidewall 1123 and together with the inner wall surfaces of the second sidewall 1122, the third sidewall 1123, and the fourth sidewall 1124, defines a cooling medium flow channel 13. The second outer surface of the flow divider 12 is disposed opposite to the first sidewall 1121 and together with the inner wall surfaces of the second sidewall 1122, the first sidewall 1121, and the fourth sidewall 1124, defines a receiving cavity. The resulting cavity is a regular rectangular shape, which facilitates the application of uniform pressure to the cable connection 211 within the cavity, thereby maintaining a certain porosity in the cable connection 211.

[0041] Furthermore, the distribution plate 12 can be configured such that at least one end along its length direction has a gap with at least one corresponding end inside the housing 11, allowing the cooling medium channel 13 to communicate with the receiving cavity. This configuration allows the cooling medium channel 13 to extend partially along the length direction of the housing 11, but not to the end. Alternatively, a gap can be left between a portion of one or both ends of the distribution plate 12 along its width direction and the interior of the housing 11. One or more through holes can also be provided on the distribution plate 12. The cooling medium channel 13 can be configured to extend from a first end to a second end along the length direction of the housing 11, or it can be configured not to extend to the second end. In one specific configuration, such as... Figures 1-3 As shown, the flow divider 12 is provided with a plurality of through holes 121 spaced apart. Each of the through holes 121 extends from the first outer surface of the flow divider 12 to the second outer surface, allowing the cooling medium to flow between the cooling medium channel 13 and the receiving cavity through the multiple through holes 121. This arrangement allows the cooling medium to flow into the cooling medium channel 13 and also to contact the cable connection portion 211 through the multiple through holes 121. While ensuring cooling effect, this reduces the flow resistance of the cooling medium in the cable connection portion 211, preventing uneven flow distribution in the cooling channel at the superconducting conductor joint, which could lead to heat exchange dead zones and thus prevent superconducting conductor joint quenching failure. Specifically, the multiple through holes 121 can be arranged as needed, distributed in a portion of the flow divider 12 along its length or width, or distributed throughout the entire flow divider 12. In one specific arrangement, such as... Figure 1 As shown, multiple through holes 121 are arranged in an array along the length and width of the flow divider 12; from one end of the flow divider 12 along its length to the other end, multiple through holes 121 are arranged in multiple rows; this arrangement ensures that the cable connection 211 in the receiving cavity and the cooling medium flow channel 13 are uniformly interconnected throughout the length of the entire housing 11, further guaranteeing the cooling effect.

[0042] The cooling medium flow channel 13 and the receiving cavity extend from the first end of the housing 11 along the length of the housing 11, and may or may not extend to the second end. In one specific arrangement, such as... Figure 2 As shown, the ends of the cooling medium flow channel 13 and the receiving cavity near the second end are spaced apart from the second end, so that the end of the cable connection part 211 near the second end is also spaced apart from the second end, so that a space 15 communicating with the cooling medium pipe 3 is formed at the second end of the housing 11. This space 15 also communicates with the receiving cavity and the cooling medium flow channel 13.

[0043] In a specific configuration method, such as Figure 3As shown, the junction box 1 also includes at least one rib 14. Each rib 14 is disposed in the cooling medium flow channel 13 and extends along the length direction of the box body 11. One side of each rib 14 along its width direction abuts against the first outer surface of the diverter plate 12, and the other side is fixedly connected to the inner wall surface of the other side wall of the junction box 1. This arrangement allows at least one rib 14 to be supported on the first outer surface of the diverter plate 12, thereby applying pressure evenly to the cable connection portion 211, while dividing the cooling medium flow channel 13 into multiple parallel channels.

[0044] Each rib 14 can be configured according to the arrangement of the manifold 12, and its extension method is consistent with that of the manifold 12; in one specific configuration, such as Figure 2 As shown, each rib 14 extends from the first end to the second end of the housing 11, and the end near the second end is spaced apart from the second end; there are multiple ribs 14, specifically 2-4, and more specifically, as shown in the diagram. Figure 3 The two or more ribs 14 shown are arranged parallel to each other and evenly spaced along the width of the diverter plate 12. This arrangement makes the structure of the junction box 1 more stable and the applied pressure more even.

[0045] In a specific configuration method, such as Figure 1 As shown, the box body 11 includes a first shell 111, a second shell 112, and an end cap 113. The first shell 111 and the second shell 112 are fixedly connected by welding and together form the first side wall 1121 and other side walls of the box body 11. The end cap 113 is fixedly connected to the ends of the first shell 111 and the second shell 112 by welding. The second shell 112 includes the first side wall 1121 and the lower halves of the two side walls adjacent to the first side wall 1121. Figures 1-3 As shown, the diverter plate 12 is disposed in the first housing 111; the end cap 113 forms the second end of the housing 11.

[0046] In this configuration, during the fabrication of the superconducting conductor connector, the cable connection portion 211 is first placed in the second housing 112, and a shunt plate 12 is placed on the cable connection portion 211. Then, the first housing 111 is installed. External equipment is used to pressurize the connector box 1, and the pressure applied to the shunt plate 12 by the first housing 111 compresses the cable connection portion 211, pressing it tightly against the first sidewall 1121. This reduces the porosity of the cable connection portion 211, thereby reducing the connector resistance. The porosity of the cable connection portion 211 can be controlled at 20-25%. While maintaining pressure, the first housing 111 and the second housing 112 are fixedly connected by welding. During welding, multiple points are fixed first, followed by pressure sealing welding. Care is taken to control the duration of each welding operation, ensuring that each welding session does not exceed 2 minutes. Simultaneously, the connection is wrapped with damp gauze to reduce damage to the cable connection portion 211 from high temperatures. The end cap 113 is fixedly connected to the first housing 111 and the second housing 112 by welding. The first end of the box body 11 is welded to the armor 22 of the superconducting conductor 2, and the welding requirements are the same as above. This embodiment is simple to operate and the box structure is stable when manufacturing the superconducting conductor joint. In the case of having at least one rib 14, the rib 14 is fixedly set on the first housing 111. After the first housing 111 is set, the rib 14 is supported on the first outer surface of the diverter plate 12, which plays a role in pressure equalization. Example 2

[0047] This embodiment provides a superconducting conductor assembly, such as... Figures 2-5 As shown, it includes a first superconducting conductor 23 and a second superconducting conductor 24. Each of the first superconducting conductor 23 and the second superconducting conductor 24 includes a superconducting cable 21 and an armor 22. The armor 22 wraps around the outer periphery of the superconducting cable 21. The superconducting cable 21 includes a cable connection portion 211 extending out of the armor 22. The cable connection portions 211 of the first superconducting conductor 23 and the cable connection portions 211 of the second superconducting conductor 24 are fixedly connected to form a superconducting conductor joint. The superconducting conductor joint includes the cable connection portion 211 of the first superconducting conductor 23, the cable connection portion 211 of the second superconducting conductor 24, and the junction box 1 of Embodiment 1. The cable connection portion 211 of the first superconducting conductor 23 extends into the receiving cavity through the opening of one of the junction boxes 1, and the cable connection portion 211 of the second superconducting conductor 24 extends into the receiving cavity through the opening of the other junction box 1.

[0048] like Figures 2-3 As shown, in a direction perpendicular to the length direction of the junction box 1, the outer walls of the first sidewalls 1121 of the two junction boxes 1 are arranged opposite each other and connected, and the conductive walls of the two junction boxes 1 are connected, so that the cable connection portion 211 of the first superconducting conductor 23 and the cable connection portion 211 of the second superconducting conductor 24 can be electrically connected through the conductive walls of the two junction boxes 1.

[0049] Specifically, when fabricating the superconducting conductor joint, the first superconducting conductor 23 and the second superconducting conductor 24 to be connected are processed by machining. Specifically, the armor 22 of the superconducting conductor 2 that needs to be joined is stripped. Care must be taken not to use cutting coolant during processing to avoid contaminating the superconducting cable 21. During machining, the armor 22 should not be cut off to the cable in one go; a margin of 0.05mm-0.1mm must be left. Then, the conductor armor 22 is manually stripped to avoid damaging the superconducting cable 21. The stainless steel overlay tape on the outside of the stripped superconducting cable 21 is then processed. The purpose of the stainless steel overlay tape is to protect the conductor cable during the cable threading process during conductor production. It needs to be removed when making the superconducting conductor joint to reduce joint resistance. Similarly, if the last stage cable has stainless steel overlay tape, it also needs to be removed.

[0050] The processed cable connector 211 is placed into the corresponding junction box 1, and the superconducting conductor connector portion of each superconducting conductor 2 is fabricated as in Example 1; then the outer walls of the first sidewalls 1121 of the two junction boxes 1 are arranged opposite each other, and then solidified and electrically connected by welding, low-temperature brazing, or isostatic pressing; it should be noted that the first superconducting conductor 23 and the second superconducting conductor 24 are both CICC superconducting conductors; the superconducting conductor connector can be made using methods such as Figure 4 The "box-type" shown and such Figure 5 This is one of the two structures shown as a "hand-shake type".

[0051] In one specific embodiment, the porosity of the cable connection portion 211 in the superconducting conductor joint is 20%-25%. If the porosity is too small, the excessive compression of the cable connection portion 211 during the fabrication of the superconducting conductor joint may damage the superconducting cable 21 and increase the resistance to the flow of the cooling medium; conversely, if the porosity is too large, the contact resistance will increase, generating excessive heat during operation. This invention discovers that controlling the porosity of the cable connection portion 211 within the range of 20%-25% can maintain extremely low contact resistance without damaging the cable connection portion 211.

[0052] After removing the armor 22, the exposed superconducting cable (i.e., cable connector 211) will have a metal plating (nickel, chromium) on its surface. This metal plating has the function of regulating the contact resistance between superconducting wires and improving the stability of the superconducting conductor. However, if there is a metal plating in the superconducting conductor joint, it will affect the electrical contact between the cable connector 211 and the conductive wall in the connector box 1. In one specific embodiment, it is necessary to clean the plating on the surface of the cable connector 211. The metal plating on the surface of the cable connector 211 in the superconducting conductor joint has been removed, that is, the outer periphery of the cable connector 211 is the superconducting wire.

[0053] Specifically, the removal of metal plating can be achieved through mechanical removal or electrochemical corrosion. Mechanical removal can be done by polishing with a wire brush; electrochemical corrosion can be performed by using a 5%wt-10%wt sodium hydroxide or sodium carbonate solution to remove chromium plating, and a 10%vol-20%vol dilute sulfuric acid solution to remove nickel plating; simultaneously, a constant current source is used to apply a current of approximately 0.055 A / cm. 2 ~0.5A / cm 2 The treated cable connection part 211 is cleaned with deionized water to ensure that the chemical solution or mechanical abrasion debris has been cleaned off; then the cleaned cable connection part 211 is placed into the corresponding junction box 1.

[0054] After welding, the superconducting conductor joint is subjected to liquid nitrogen cold impact, followed by pressure testing for leaks. The pressure test pressure is not less than 2 MPa. A vacuum positive pressure leak test is then performed on the joint, with a leak rate of less than 1 × 10⁻⁶. -9 Pa·m³ / s.

[0055] It should be noted that, in addition to the specific embodiments described above, those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model is presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to that embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. In order to provide a deep understanding of this utility model, many specific details are included in the above description, and this utility model may also be implemented without using these details. In addition, in order to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0056] It should be noted that similar reference numerals and letters in this specification are similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0057] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0058] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0059] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0060] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A junction box for a superconducting conductor, the superconducting conductor comprising a superconducting cable and an armor, the armor covering the outer periphery of the superconducting cable, the superconducting cable including a cable connector extending out of the armor, characterized in that, The junction box includes: A box body, wherein the box body has an opening at a first end along its length direction, and at least a portion of the first sidewall of the box body is configured as a conductive wall along its length direction; The diversion plate is disposed in the inner cavity of the box and extends along the length direction of the box. The two sides of the diversion plate along its width direction are respectively connected to the other side walls of the box except the first side wall. Wherein, the first outer surface of the flow divider along its thickness direction and the inner wall surface of the other side wall of the box body jointly define a cooling medium flow channel, the second outer surface of the flow divider along its thickness direction and the inner wall surface of the other side wall of the box body and the inner wall surface of the first side wall jointly define a receiving cavity, the first outer surface and the second outer surface are arranged opposite to each other in the thickness direction of the flow divider, and the cooling medium flow channel and the receiving cavity both extend along the length direction of the box body; Furthermore, the opening is used for the cable connection portion to pass through and extend into the receiving cavity, and to be pressed between the second outer surface of the diverter plate and the inner wall surface of the first side wall of the housing, and the conductive wall of the housing is electrically connected to the cable connection portion, the end face of the first end of the housing is connected to one end face of the armor; and the cooling medium flow channel is in communication with the receiving cavity, so that the cooling medium in the receiving cavity can be transported into the cooling medium flow channel, and the second end of the housing is used to connect to the cooling medium pipe, so that the receiving cavity is in communication with the cooling medium pipe.

2. The junction box for superconducting conductors as described in claim 1, characterized in that, The flow divider plate is provided with a plurality of through holes spaced apart. Each of the plurality of through holes extends from the first outer surface of the flow divider plate to the second outer surface, so that the cooling medium can flow through the plurality of through holes between the cooling medium flow channel and the receiving cavity.

3. The junction box for superconducting conductors as described in claim 2, characterized in that, The plurality of through holes are arranged in an array along the length and width of the flow divider; from one end of the flow divider along its length to the other end, the plurality of through holes are arranged in multiple rows.

4. The junction box for superconducting conductors as described in claim 1, characterized in that, The junction box further includes at least one rib, each rib being disposed in the cooling medium flow channel and extending along the length direction of the box body. Each rib abuts against the first outer surface of the diverter plate on one side along the width direction, and is fixedly connected to the inner wall surface of the other side wall of the junction box on the other side.

5. The junction box for superconducting conductors as described in claim 4, characterized in that, Each of the ribs extends from the first end of the box body toward the second end, and the end near the second end is spaced apart from the second end; There are multiple ribs, and the multiple ribs are arranged parallel to each other and spaced apart in the width direction of the diverter plate.

6. The junction box for superconducting conductors as described in claim 1, characterized in that, The cooling medium flow channel and the end of the receiving cavity near the second end are both spaced apart from the second end; The other sidewalls of the box include a second sidewall, a third sidewall, and a fourth sidewall that are sequentially connected along the circumference of the box. The first sidewall is connected between the second sidewall and the fourth sidewall and is disposed opposite to the third sidewall. The flow divider abuts against the inner wall surfaces of the second sidewall and the fourth sidewall on both sides along its width direction, and the first outer surface of the flow divider is spaced apart from the third sidewall and together with the inner wall surfaces of the second sidewall, the third sidewall, and the fourth sidewall defines the cooling medium flow channel. The second outer surface of the flow divider is spaced apart from the first sidewall and together with the inner wall surfaces of the second sidewall, the first sidewall, and the fourth sidewall defines the receiving cavity.

7. The junction box for a superconducting conductor as described in any one of claims 1-6, characterized in that, The box body includes a first shell, a second shell, and an end cap. The first shell and the second shell are fixedly connected by welding and together form the first side wall and the other side walls of the box body. The end cap is fixedly connected to one end of the first shell and the second shell by welding. The second housing includes the first sidewall and the lower half of two sidewalls adjacent to the first sidewall; the diverter plate is disposed in the first housing; and the end cap forms the second end of the box body.

8. A superconducting conductor assembly, comprising a first superconducting conductor and a second superconducting conductor, wherein a cable connection portion of the first superconducting conductor and a cable connection portion of the second superconducting conductor are fixedly connected to form a superconducting conductor joint, characterized in that, The superconducting conductor connector includes a cable connection portion of the first superconducting conductor, a cable connection portion of the second superconducting conductor, and two connector boxes as described in any one of claims 1-7, wherein the cable connection portion of the first superconducting conductor extends into the receiving cavity through the opening of one of the connector boxes, and the cable connection portion of the second superconducting conductor extends into the receiving cavity through the opening of the other connector box. In a direction perpendicular to the length direction of the junction box, the outer wall surfaces of the first sidewalls of the two junction boxes are arranged opposite to each other and connected, and the conductive walls of the two junction boxes are connected, so that the cable connection portion of the first superconducting conductor and the cable connection portion of the second superconducting conductor can be electrically connected through the conductive walls of the two junction boxes.

9. The superconducting conductor assembly as described in claim 8, characterized in that, The porosity of the cable connection portion in the superconducting conductor joint is 20%-25%.

10. The superconducting conductor assembly as claimed in claim 8 or 9, characterized in that, The outer periphery of the cable connection portion in the superconducting conductor joint is made of superconducting wire.

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