CN114336102A

CN114336102A - Superconducting cable joint and device

Info

Publication number: CN114336102A
Application number: CN202111371764.8A
Authority: CN
Inventors: 陈腾彪
Original assignee: Shenzhen Power Supply Bureau Co Ltd
Current assignee: Shenzhen Power Supply Bureau Co Ltd
Priority date: 2021-11-18
Filing date: 2021-11-18
Publication date: 2022-04-12
Anticipated expiration: 2041-11-18
Also published as: CN114336102B

Abstract

The invention relates to a superconducting cable joint and a superconducting cable device, and relates to the technical field of superconducting cables. The superconducting cable joint includes a pipe connection assembly and a cable connection assembly. The pipe connecting assembly is used for being connected between any adjacent Dewar pipes and is constructed with a cable cavity used for accommodating cables, and the cable connecting assembly is used for being connected between any adjacent cables and is accommodated in the cable cavity. Through the arrangement, a complete sealing channel can be formed around the cable, so that the filled liquid nitrogen can normally circulate at the joint and cannot leak at the joint, and the power transmission capacity of the cable is improved. Meanwhile, the pipe connecting assembly can form a first heat insulation cavity and a second heat insulation cavity which are wrapped on the outer peripheral side of the cable cavity, so that the continuity and the sealing performance of connection of the heat insulation layer on the outer side of liquid nitrogen at the joint are guaranteed, the liquid nitrogen filled into the periphery of the cable cannot be subjected to heat exchange with the external environment rapidly at the joint, and the superconducting transmission capacity of the cable at the joint is guaranteed.

Description

Superconducting cable joint and device

Technical Field

The invention relates to the technical field of superconducting cables, in particular to a superconducting cable joint and a superconducting cable device.

Background

With the rapid development of large cities, higher requirements are provided for the power supply capacity of power transmission equipment, and conventional copper conductors have difficulty in meeting the requirements, so that a superconducting cable is required to solve the problem of large-current transmission of a power transmission line. After the superconducting cable is connected to the existing power grid, the cable needs to be placed in a working environment filled with liquid nitrogen to improve the superconducting performance of the cable, and after the line length reaches a certain degree, a single long superconducting cable cannot meet the production, transportation and construction requirements, so that a plurality of short superconducting cables need to be connected to form the superconducting cable. The intermediate joint commonly used for cable connection at present can only realize the connection of the power channel of the cable, and cannot ensure the superconducting performance of the cable at the joint.

Disclosure of Invention

In view of the above, it is necessary to provide a superconducting cable joint for solving the problem that the superconducting performance of the cable cannot be ensured at the joint of the conventional cable joint.

A superconducting cable joint includes a pipe connection assembly and a cable connection assembly. The pipe connecting assembly is used for connecting any adjacent Dewar pipes; the pipe connecting assembly is provided with a cable cavity for accommodating a cable, a first heat insulation cavity and a second heat insulation cavity, wherein the first heat insulation cavity and the second heat insulation cavity are wrapped on the outer peripheral side of the cable cavity; the cable connecting assembly is used for being connected between any adjacent cables, and the cable connecting assembly is accommodated in the cable cavity.

In one embodiment, the pipe coupling assembly comprises a first sleeve, a second sleeve, and a first sandwich pipe; the second sleeve is sleeved on the outer side of the first sleeve, the first interlayer pipe is provided with a first interlayer cavity, and two side walls of the first interlayer cavity are respectively connected to the end portions of the first sleeve and the second sleeve to jointly enclose the first heat insulation cavity.

In one embodiment, the pipe coupling assembly further comprises a second sandwich pipe; the second interlayer pipe is connected to the inner side of the first interlayer pipe, and a cylinder cavity of the second sleeve and a pipe cavity of the second interlayer pipe are enclosed together to form the cable cavity; the second interlayer pipe is provided with a second interlayer cavity, two side walls of the second interlayer cavity are used for being respectively connected to the inner layer and the outer layer of the Dewar pipe, and the second interlayer cavity forms the second heat insulation cavity.

In one embodiment, the cable connection assembly includes a connecting rod, a first conductive barrel, and a second conductive barrel; the first conducting cylinder and the second conducting cylinder are respectively connected to two ends of the connecting rod; the first conducting cylinder is sleeved on one of any two adjacent cables, the second conducting cylinder is sleeved on the other cable, and the first conducting cylinder and the second conducting cylinder are both connected with the conducting layers of the cables on the same side.

In one embodiment, the first and second conductive drums each comprise a first, second, and third collar; the second sleeve ring is connected to one end of the first sleeve ring, and one end of the first sleeve ring, which is connected with the second sleeve ring, is inserted between the conducting layer and the insulating layer of the cable; the third sleeve ring is sleeved on the outer side of the first sleeve ring and used for pressing the conducting layer.

In one embodiment, the first collar and/or the third collar is configured with an injection hole for injecting a curing agent between the first collar and the third collar.

In one embodiment, the first conducting cylinder and the second conducting cylinder each include a clamp, the clamp is sleeved on the outer side of the first lantern ring and/or the third lantern ring of the same group, and the clamp is used for being connected with the connecting rod.

In one embodiment, the number of the cable connection assemblies is multiple groups; each cable is provided with a plurality of conducting layers which are sequentially sleeved from inside to outside along the radial direction, each conducting layer is provided with a connecting section, and the connecting sections are exposed at intervals along the axial direction of the cable; use two arrange and along radial two along exposing direction on the cable the linkage segment is a set of, every group the linkage segment corresponds a set of cable coupling assembling, and the multiunit among the cable coupling assembling the connecting rod winds the axis interval arrangement of cable.

In one embodiment, the superconducting cable joint further includes at least two support brackets, and the at least two support brackets are arranged at intervals in an axial direction of the pipe joint assembly and are connected to the pipe joint assembly.

The present invention also provides a superconducting cable apparatus capable of solving at least one of the above-described technical problems.

A superconducting cable device comprises the superconducting cable joint and a plurality of superconducting cable bodies, wherein one superconducting cable joint is connected between any adjacent superconducting cable bodies.

The invention has the beneficial effects that:

a superconducting cable joint includes a pipe connection assembly and a cable connection assembly. The pipe connecting assembly is used for being connected between any adjacent Dewar pipes and is constructed with a cable cavity used for accommodating cables, and the cable connecting assembly is used for being connected between any adjacent cables and is accommodated in the cable cavity. Through the arrangement, the cable cavity formed by the pipe connecting assembly can communicate the inner cavity of the Dewar pipe for accommodating the cables and form a complete sealed channel so as to ensure that the filled liquid nitrogen can normally circulate at the joint and cannot leak at the joint, and after the cable connecting assembly electrically connects the two cables in the cable cavity, the two adjacent cables can form the communicated electrical channel for power transmission and the power transmission capacity of the cable connecting assembly can be improved under the wrapping of the filled liquid nitrogen. Simultaneously through foretell setting, the second heat-insulating chamber among the pipe coupling assembling communicates with the confined space in the dewar pipe of homonymy, and first heat-insulating chamber wraps up in the periphery side in second heat-insulating chamber to guaranteed the continuity and the leakproofness of connecting in this joint liquid nitrogen outside heat-insulating layer, feasible fill into the liquid nitrogen around the cable can not be quick and external environment carries out the heat exchange in this joint department, in order to guarantee can not lead to the fact the influence to the superconducting transmission ability of cable in this joint department.

Drawings

Fig. 1 is an overall schematic view of a superconducting cable joint provided by an embodiment of the present invention;

fig. 2 is an overall sectional view of a superconducting cable joint according to an embodiment of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

fig. 4 is a schematic view of a first sleeve in the superconducting cable joint according to the embodiment of the present invention;

fig. 5 is a schematic view of a second sleeve in the superconducting cable joint according to the embodiment of the present invention;

fig. 6 is a schematic view of a first interlayer pipe in the superconducting cable joint according to the embodiment of the present invention;

fig. 7 is a sectional view of a second interlayer pipe in the superconducting cable joint according to the embodiment of the present invention;

fig. 8 is an exploded view of a cable connection assembly in a superconducting cable joint according to an embodiment of the present invention;

fig. 9 is a schematic view of a conductive sleeve in a superconducting cable joint according to an embodiment of the present invention;

fig. 10 is a schematic view illustrating the installation of a conductive sleeve in a superconducting cable joint according to an embodiment of the present invention;

fig. 11 is a schematic view showing connection of cable connection assemblies in the superconducting cable joint according to the embodiment of the present invention;

fig. 12 is a schematic view of a support frame in a superconducting cable joint according to an embodiment of the present invention.

Reference numerals: 11-outer dewar tube; 12-an inner dewar tube; 21-a first sleeve; 211-exhaust valves; 212-first connecting ring; 22-a second sleeve; 221-a second connecting ring; 23-a first sandwich pipe; 231-outer tube; 232-inner layer tube; 233-inner connecting piece; 234-outer connection piece; 24-a second sandwich pipe; 241-outer sealing pipe; 242-inner sealed tube; 243-inner connecting section; 244 — an outer connecting section; 25-a first connecting tab; 26-a second connecting piece; 30-a pipe connection assembly; 40-a cable connection assembly; 401-a first collar; 4011-injection hole; 4012-an injection groove; 402-a second collar; 403-a third collar; 41-a connecting rod; 42-a first conductive cylinder; 43-a second conductive cylinder; 44-a clamp; 45-an insulating sleeve; 46-an insulating cover; 47-nut slice; 48-screws; 50-a cable cavity; 80-a support frame; 81-a support seat; 82-roller frame; 83-a roller; 100-a cable; 101-conductive layer.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1 and 2, fig. 1 shows an overall schematic view of a superconducting cable joint according to an embodiment of the present invention, and fig. 2 shows an overall sectional view of the superconducting cable joint according to an embodiment of the present invention. An embodiment of the present invention also provides a superconducting cable apparatus including a superconducting cable joint and a plurality of superconducting cable bodies. When in use, one superconducting cable joint is connected between any two adjacent superconducting cable bodies. Wherein the adjacent two ends of two adjacent cable bodies are inserted from the two ends of the superconducting cable joint, and are electrically connected in the pipe connecting assembly 30 of the superconducting cable joint through the cable connecting assembly 40, so as to form a complete electrical transmission channel between the two adjacent cable bodies; meanwhile, the pipe connection assembly 30 can connect the dewar pipes where the two adjacent cable bodies are located, so that a channel for liquid nitrogen to flow and a continuous heat insulation layer are formed at the joint, and the superconductivity of the two adjacent cables is ensured. The superconducting cable joint will be specifically described below.

Please refer to fig. 1 and fig. 2. In some embodiments, the superconducting electrical cable joint includes a pipe connection assembly 30 and a cable connection assembly 40. Wherein the pipe coupling assembly 30 is for coupling between any adjacent dewar pipes; the pipe connection assembly 30 is configured with a cable cavity 50 for accommodating the cable 100, and a first heat insulation cavity and a second heat insulation cavity which are wrapped on the outer peripheral side of the cable cavity 50, wherein the first heat insulation cavity is wrapped on the outer peripheral side of the second heat insulation cavity, and the second heat insulation cavity is communicated with the sealed space in the Dewar pipe on the same side. Also, the cable connector assembly 40 is adapted to be connected between any adjacent cables 100, with the cable connector assembly 40 being received within the cable cavity 50.

Specifically, the two axial ends of the pipe connecting assembly 30 are respectively connected between two adjacent dewar pipes, the cable cavity 50 of the pipe connecting assembly 30 can communicate the inner dewar pipe 12 of the two adjacent dewar pipes, and the heat insulating layers in the two adjacent dewar pipes are connected through the first heat insulating cavity and the second heat insulating cavity. The cables 100 positioned in two adjacent dewars are inserted into the cable chamber 50 of the pipe connecting assembly 30 from both ends of the pipe connecting assembly 30 in its own axial direction, respectively, and are electrically connected in the cable chamber 50 by the cable connecting assembly 40. With such an arrangement, two adjacent cables 100 can be electrically connected at the superconducting cable joint, so as to achieve the purpose of power transmission of the cables 100; meanwhile, the cable cavity 50 provides a necessary space for the electrical connection of the cable 100, and simultaneously, the circulation of liquid nitrogen in two adjacent dewar tubes at the joint of the superconducting cable can be ensured, so that the cable 100 can be in a working environment wrapped by the liquid nitrogen at the joint of the superconducting cable, and the superconducting transmission capability of the cable 100 can be ensured. In addition, the first insulating chamber, which is wrapped around the outer circumference of the cable chamber 50, provides a thermal insulation layer for liquid nitrogen at the superconducting cable joint; the second heat insulation cavity is communicated with the sealing space in the Dewar pipe at the same side, so that the relative tightness of a heat insulation layer in the Dewar pipe is ensured. Through the arrangement that the first heat insulation cavity, the second heat insulation cavity and the first heat insulation cavity are wrapped on the outer peripheral side of the second heat insulation cavity, the heat insulation layer of the pipe connection assembly 30 can be completely and hermetically connected with the heat insulation layer in the Dewar pipe at the superconducting cable joint, leakage of liquid nitrogen at the superconducting cable joint and heat exchange with the external environment are avoided, and reliability of heat insulation of the liquid nitrogen at the superconducting cable joint is guaranteed.

Referring to fig. 3, 4, 5 and 6, fig. 3 is a partial enlarged view of fig. 2 at a, and fig. 4 is a schematic view of a first sleeve according to an embodiment of the present invention; fig. 5 shows a schematic view of a second sleeve in an embodiment of the invention, and fig. 6 shows a schematic view of a first sandwich tube in an embodiment of the invention. In some embodiments, the pipe connection assembly 30 includes a first sleeve 21, a second sleeve 22, and a first sandwich pipe 23; the second sleeve 22 is sleeved outside the first sleeve 21, the first interlayer pipe 23 has a first interlayer cavity, and two side walls of the first interlayer cavity are respectively connected to the end portions of the first sleeve 21 and the second sleeve 22 to jointly enclose a first heat insulation cavity.

Specifically, the first sleeve 21 and the second sleeve 22 are both hollow cylindrical, the first sleeve 21 is coaxially sleeved outside the second sleeve 22, the first connection ring 212 is installed at two ends of the first sleeve 21, and the second connection ring 221 is connected at two ends of the second sleeve 22. The first interlayer pipe 23 includes an outer pipe 231 and an inner pipe 232 coaxially disposed, the outer pipe 231 is sleeved outside the inner pipe 232, and one end of the outer pipe 231 and one end of the inner pipe 232 are aligned and hermetically connected, so as to form a first interlayer cavity between the outer pipe 231 and the inner pipe 232. Wherein, the outer connecting piece 234 and the inner connecting piece 233 are respectively connected with one end of the outer pipe 231 and the inner pipe 232 which are far away from the sealing connection end. When the connector is installed, the outer connecting piece 234 and the first connecting ring 212 are connected through the first connecting piece 25, the inner connecting piece 233 and the second connecting ring 221 are connected through the second connecting piece 26, and sealing rings are arranged at the pressing surfaces between the outer connecting piece 234 and the first connecting piece 25, between the first connecting ring 212 and the first connecting piece 25, between the inner connecting piece 233 and the second connecting piece 26, and between the second connecting ring 221 and the second connecting piece 26 in a pressure equalizing manner. With this arrangement, the space region between the first sleeve 21 and the second sleeve 22 forms a first heat insulation chamber together with the first interlayer chamber, so that there is also a heat insulation layer at the superconducting cable joint to thermally insulate and preserve the liquid nitrogen flowing through the superconducting cable joint; by arranging the sealing rings, the sealing performance of the joints of the first sleeve 21, the second sleeve 22 and the first interlayer pipe 23 is improved, and the reliability of heat insulation of the first heat insulation cavity is ensured; meanwhile, through the arrangement of the first connecting piece 25 and the second connecting piece 26, the first interlayer pipe 23 with the smaller diameter can be transitionally connected with the first sleeve 21 and the second sleeve 22 with the larger diameter, and the appearance outside the first heat insulation cavity and the connectivity inside the first heat insulation cavity can be ensured while the production and the processing are facilitated.

It should be added that the first sleeve 21 and the second sleeve 22 are respectively provided with a first interlayer pipe 23 at two ends, and the first sleeve 21, the second sleeve 22 and the two first interlayer pipes 23 are collectively surrounded at the superconducting cable joint to form an independent and sealed heat insulation layer relative to the dewar pipe. With this arrangement, it is possible to facilitate the subsequent setting of the thermal insulation layer in a vacuum state to improve the singleness of the superconducting cable joint.

In some embodiments, an air vent valve 211 is further installed on the side wall of the first sleeve 21, and after the first sleeve 21, the second sleeve 22 and the two first interlayer pipes 23 form a sealed and independent heat insulation layer, air in the heat insulation layer can be evacuated through the air vent valve 211 to make the heat insulation layer into a vacuum state, so as to improve the heat insulation capability of the heat insulation layer.

Referring to fig. 2, 3 and 7, fig. 7 is a cross-sectional view of a second sandwich pipe according to an embodiment of the invention. In some embodiments, the pipe coupling assembly 30 further includes a second sandwich pipe 24; the second interlayer pipe 24 is connected to the inner side of the first interlayer pipe 23, and the cylindrical cavity of the second sleeve 22 and the lumen of the second interlayer pipe 24 are jointly enclosed to form a cable cavity 50; the second sandwich pipe 24 has a second sandwich cavity, both side walls of the second sandwich cavity are used for being connected to the inner and outer layers of the dewar pipe respectively, and the second sandwich cavity forms a second heat insulation cavity.

Specifically, the second interlayer pipe 24 includes an outer sealing pipe 241 and an inner sealing pipe 242 which are coaxially arranged, the outer sealing pipe 241 is sleeved outside the inner sealing pipe 242, and one end of the outer sealing pipe 241 is aligned and hermetically connected with one end of the inner sealing pipe 242, so that a second interlayer cavity is formed between the outer sealing pipe 241 and the inner sealing pipe 242. Wherein, the end of the outer sealing pipe 241 and the end of the inner sealing pipe 242 departing from the sealing connection are respectively connected with an outer connecting section 244 and an inner connecting section 243, and a connecting flange is arranged at the end of the outer connecting section 244 departing from the outer sealing pipe 241. When the pipe is installed, the two second interlayer pipes 24 are respectively installed at opposite ends of the two adjacent dewar pipes and are respectively connected with the two first interlayer pipes 23. Wherein, one end of the inner connecting section 243 departing from the inner sealing pipe 242 is fixedly connected with the inner dewar pipe 12, and one end of the outer connecting section 244 provided with a flange is fixedly connected with the outer dewar pipe 11, so as to form a sealed second heat insulation cavity; one end of the second interlayer pipe 24 departing from the dewar pipe is inserted from one end of the first interlayer pipe 23 departing from the first sleeve 21 and abutted on the end surface of the inner connecting sheet 233 departing from the first sleeve 21, and the flange on the outer connecting section 244 and one end of the first interlayer pipe 23 departing from the first sleeve 21 are fixedly connected through bolts. Meanwhile, the outer side wall of the outer sealing pipe 241 far away from the inner sealing pipe 242 and the inner side wall of the inner layer pipe 232 far away from the outer layer pipe 231 are pressed together, and sealing rings are pressed on the pressing surfaces between the outer sealing pipe 241 and the inner layer pipe 232 and between the second interlayer pipe 24 and the inner connecting sheet 233. With this arrangement, the cylinder chamber of the second sleeve 22 and the inside of the inner sealing tube 242 together enclose a cable chamber 50 for housing the cable 100 and liquid nitrogen; the second interlayer tube 24 abuts against the inner connection plate 233 and is provided with a gasket on the compression surface, so that the sealing performance of the cable chamber 50 is improved and the leakage of liquid nitrogen flowing through the cable chamber 50 is prevented. Meanwhile, the outer sealing pipe 241 and the inner pipe 232 are pressed together, so that the first heat insulation cavity and the second heat insulation cavity can have an overlapping part, the connection continuity of the heat insulation layers at the joint of the superconducting cable is ensured, and an effective heat insulation effect can be achieved; and the sealing ring is pressed on the pressing surface, so that the leakage of liquid nitrogen from the position is further prevented.

It should be added that, in a specific embodiment, the flange of the outer connecting section 244 and the first sandwich pipe 23 are bolted together at a position where a certain gap is left between the flange and the first sandwich pipe after the flanges and the first sandwich pipe are tightened. By this arrangement, it is ensured that the second sandwich tube 24 has been tightly abutted against the inner connecting piece 233, thereby further ensuring that no leakage of liquid nitrogen occurs in the cable chamber 50.

In some embodiments, the number of the second interlayer pipes 24 is one, and both ends of the second interlayer pipes 24 are respectively connected between two adjacent dewar pipes and penetrate through the entire lumen of the second sleeve 22 and the lumens of the two second interlayer pipes 24.

Referring to fig. 2 and 8, fig. 8 is an exploded view of a cable connecting assembly according to an embodiment of the present invention. In some embodiments, the cable connection assembly 40 includes a connecting rod 41, a first conductive cylinder 42, and a second conductive cylinder 43; the first and second

conductive cylinders

42 and 43 are connected to both ends of the connecting rod 41, respectively; the first conductive cylinder 42 is sleeved on one of any two adjacent cables 100, the second conductive cylinder 43 is sleeved on the other, and both the first conductive cylinder 42 and the second conductive cylinder 43 are connected with the conductive layer 101 of the cable 100 on the same side.

Specifically, after the inner layers of the two adjacent cables 100 are connected, the first conductive tube 42 and the second conductive tube 43 are respectively sleeved on the conductive layers 101 of the two cables 100 and are respectively fixed relative to the cables 100, so that the cables 100 cannot be displaced relative to each other. Both ends of the connecting rod 41 are fixedly connected with the first and second

conductive cylinders

42 and 43, respectively. With such an arrangement, the same conductive layers 101 of two adjacent cables 100 can be connected to each other to enable power transmission; meanwhile, the axial fixing connection function can be realized on two adjacent cables 100, so that the two connected cables 100 are prevented from being disconnected due to excessive axial tension.

Referring to fig. 9 and 10, fig. 9 is a schematic view of a conductive cylinder according to an embodiment of the present invention, and fig. 10 is a schematic view of an installation of the conductive cylinder according to an embodiment of the present invention. In some embodiments, the first and second

conductive cylinders

42, 43 each include a first collar 401, a second collar 402, and a third collar 403; the second collar 402 is connected to one end of the first collar 401, and one end of the first collar 401, to which the second collar 402 is connected, is inserted between the conductive layer 101 and the insulating layer of the cable 100; the third collar 403 is sleeved outside the first collar 401 and used for pressing the conductive layer 101.

Specifically, the first collar 401, the second collar 402, and the third collar 403 are all hollow. Wherein, the first collar 401 is configured with a large end and a small end along the axial direction thereof, a plurality of annular injection grooves 4012 are configured on the outer side wall of the small end along the axial direction thereof at intervals, and the plurality of annular injection grooves 4012 are communicated through a linear groove along the axial direction of the first collar 401; the end of the big end facing the small end is provided with an annular convex ring. One end of the second collar 402 is fixedly connected with the small end of the first collar 401, and the other end is provided with a retaining ring along the circumferential direction in a protruding manner. The third collar 403 is provided with a plurality of compression rings axially spaced along itself in its inner wall. When the cable is installed, the third collar 403 is firstly sleeved on the cable 100, one end of the first collar 401, which is connected with the second collar 402, is inserted between the conducting layer 101 and the insulating layer of the cable 100, so that the conducting layer 101 is tightly wrapped on the small end of the first collar 401 and the outer side wall of the second collar 402; after the third collar 403 is sleeved into the small end of the first collar 401 along the end of the large end of the first collar 401, the inner side wall of the third collar 403 facing the end of the large end of the first collar 401 can tightly fit with the outer side wall of the bulge loop, and the clamp ring of the third collar 403 can tightly press the conductive layer 101 against the outer side wall of the small end. With this arrangement, conductive layer 101 of cable 100 can be led out to the outer surface of cable 100 so as to communicate conductive layers 101 of two adjacent cables 100 through connecting bar 41. Meanwhile, an axial seal is formed on the space region between the first collar 401 and the third collar 403 by the end surface of the baffle ring in the second collar 402 facing the large end and the end surfaces of the large end and the small end of the first collar 401, so as to prevent the curing agent from flowing out along the axial direction of the first collar 401 after the curing agent is injected into the space region between the first collar 401 and the third collar 403.

In other embodiments, the second collar 402 may be welded to the end surface of the small end of the first collar 401 by welding the end surface of the second collar 402 away from the end of the retainer ring, or by fitting the inner sidewall of the second collar 402 over the outer sidewall of the small end of the first collar 401.

Please continue to refer to fig. 9. In some embodiments, the first collar 401 and the third collar 403 are each configured with an injection hole 4011, the injection hole 4011 being used to inject a curing agent between the first collar 401 and the third collar 403. Specifically, the injection holes 4011 are formed on the outer side wall of the large end of the first collar 401 and the outer side wall of the third collar 403, wherein the injection holes 4011 on the first collar 401 communicate with the linear grooves on the small end and the injection grooves 4012, and the injection holes 4011 on the third collar 403 communicate with the inner side wall thereof. With such an arrangement, after the first collar 401, the second collar 402 and the third collar 403 compress the conductive layer 101, the curing agent can flow in from the injection hole 4011 and fill the whole space area between the first collar 401 and the third collar 403, and after the curing agent is solidified, the conductive layer 101 is more firmly connected with the first collar 401, the second collar 402 and the third collar 403.

In other embodiments, the outer sidewall of the large end of the first collar 401 is configured with injection holes 4011 communicating with linear grooves on the small end and with injection grooves 4012; or the outer sidewall of the third collar 403 is configured with the injection hole 4011 communicated with the inner sidewall thereof. The curing agent may fill the entire space region between the first collar 401 and the third collar 403 through the injection hole 4011 on the first collar 401 or the third collar 403. In one specific embodiment, the curing agent is a liquid solder that is liquid after heating and solid at ambient temperature.

Please refer to fig. 8. In some embodiments, the first and second

conductive cylinders

42 and 43 each include a collar 44, the collar 44 is disposed outside the same set of first collars 401, and the collar 44 is used to connect with the connecting rod 41. Specifically, the clamp 44 is formed by two half rings with connecting lugs in a buckled mode, the two half rings are buckled behind the outer side of the first sleeve 401, the connecting lugs of the two half rings can be pressed together and fixed through the nut piece 47 and the screw 48, and therefore the clamp 44 can be tightly sleeved on the outer side of the first sleeve 401. Meanwhile, the two ends of the connecting rod 41 are fixedly connected with the clamps 44 on the first and

second transmission cylinders

42 and 43 respectively through nut pieces 47 and screws 48 for fixedly connecting the two half rings. With such an arrangement, it is possible to facilitate the fixed connection of the connecting rod 41 with the first and second

conductive cylinders

42 and 43; meanwhile, an electric power transmission channel formed by the first collar 401 of the first conductive cylinder 42, the collar 44 of the first conductive cylinder 42, the connecting rod 41, the collar 44 of the second conductive cylinder 43 and the first collar 401 of the second conductive cylinder 43 can be formed between two adjacent cables 100, so that electric transmission can be realized.

It should be added that each clip 44, which is disposed outside the first collar 401, has two opposite engaging lugs, that is, the first conductive cylinder 42 and the second conductive cylinder 43 are connected by two connecting rods 41, and the two connecting rods 41 are disposed on two sides of the cable 100 along the axial direction of the cable 100. Through the arrangement, the two adjacent cables 100 can be uniformly stressed at the joint, and the phenomenon that the cables 100 are broken or bent due to nonuniform stress at the joint is avoided; at the same time, the efficiency of electrical transmission between two adjacent cables 100 can be improved.

In some embodiments, the clips 44 are disposed on the outer side of the same set of third rings 403, or one of the clips 44 is disposed on the outer side of the third rings 403, and the other clip 44 is disposed on the outer side of the first ring 401.

In some other embodiments, an insulating sleeve 45 is sleeved outside the connecting rod 41, and insulating covers 46 are covered at two ends of the connecting rod. Through the arrangement, the insulativity of the connecting rods 41 and the two ends of the connecting rods can be improved, so that the situation that the two adjacent connecting rods 41 discharge mutually is avoided.

Referring to fig. 11, fig. 11 is a schematic view of a cable connection assembly according to an embodiment of the invention. In some embodiments, the number of cable connection assemblies 40 is multiple sets; each cable 100 is provided with a plurality of conducting layers 101 which are sequentially sleeved from inside to outside along the radial direction, each conducting layer 101 is provided with a connecting section, and the connecting sections are exposed at intervals along the axial direction of the cable 100; two connecting sections which are arranged on the two cables 100 along the exposure direction and correspond to each other in the radial direction are taken as a group, each group of connecting sections corresponds to one group of cable connecting assemblies 40, and the connecting rods 41 in the multiple groups of cable connecting assemblies 40 are arranged at intervals around the axis of the cables 100.

Specifically, each set of cable connection assemblies 40 includes a first conductive cylinder 42, a second conductive cylinder 43, and two connecting rods 41. When in connection, the first conductive cylinders 42 and the second conductive cylinders 43 are respectively fixedly sleeved on the connection sections of the two adjacent cables 100; the tail ends of the opposite inner frameworks of the two adjacent cables 100 are fixedly connected together by welding, and the shielding layers and the insulating layers corresponding to each other on the two inner frameworks are connected in a wrapping mode by using shielding belts and insulating belts respectively. The first conductive cylinder 42 and the second conductive cylinder 43 on each group of connecting segments are connected in conduction through two connecting rods 41 with the same length. The two connecting rods 41 in each group of connecting sections are distributed on two sides of the cable 100 by taking the axis of the cable 100 as a symmetry axis, and the connecting rods 41 in the multiple groups of connecting sections are arranged at intervals along the axis of the cable 100. Wherein, the same first transmission cylinder 42 and second transmission cylinder 43 and two connecting rods 41 with different lengths are arranged between different connecting section groups; both ends of the connecting rod 41 are fixedly connected with the first and second

conductive cylinders

42 and 43, respectively, through clips 44. With this arrangement, the plurality of sets of cable connection assemblies 40 communicate all of the conductive layers 101 of two adjacent cables 100 to achieve low loss of electrical transmission between the two adjacent cables 100. Meanwhile, the plurality of connecting rods 41 in the plurality of groups of connecting sections are arranged at intervals around the axis of the cable 100, so that the uniformity of electric field distribution of two adjacent cables 100 and the electrical performance of the whole superconducting cable joint can be improved.

Please refer to fig. 4 and 12. Fig. 12 shows a schematic view of a support stand according to an embodiment of the invention. In some embodiments, the superconducting electrical cable joint further includes at least two support brackets 80, and the at least two support brackets 80 are arranged at intervals in the axial direction of the pipe joint assembly 30 and are both connected to the pipe joint assembly 30. Specifically, the supporting frame 80 is composed of a supporting base 81, a roller frame 82 and a roller 83. One side of the supporting seat 81 is configured with an arc-shaped groove with the same diameter as the first sleeve 21, and one side of the supporting seat 81 departing from the arc-shaped groove is provided with a roller 83 through a roller frame 82. When in use, the arc-shaped groove of the supporting seat 81 is clamped on the outer side wall of the first sleeve 21 by the supporting frame 80, and the supporting frame is fixedly connected with the first sleeve 21. With this arrangement, it is possible to provide a supporting function to the superconducting cable joint in the present application, and to convert the sliding friction with the ground into the rolling friction by the roller 83 during the movement of the superconducting cable joint, thereby facilitating the movement.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A superconducting cable joint, characterized by comprising:

a pipe connection assembly (30) for connection between any adjacent dewar pipes; the pipe connecting assembly (30) is configured with a cable cavity (50) for accommodating a cable (100), and a first heat insulation cavity and a second heat insulation cavity which are wrapped on the outer peripheral side of the cable cavity (50), the first heat insulation cavity is wrapped on the outer peripheral side of the second heat insulation cavity, and the second heat insulation cavity is communicated with a sealed space in the Dewar pipe on the same side;

the cable connecting assembly (40) is used for being connected between any adjacent cables (100), and the cable connecting assembly (40) is accommodated in the cable cavity (50).

2. Superconducting cable joint according to claim 1, characterized in that the pipe connection assembly (30) comprises a first sleeve (21), a second sleeve (22) and a first sandwich pipe (23);

the second sleeve (22) is sleeved outside the first sleeve (21), the first interlayer pipe (23) is provided with a first interlayer cavity, and two side walls of the first interlayer cavity are respectively connected to the end parts of the first sleeve (21) and the second sleeve (22) to jointly enclose the first heat insulation cavity.

3. Superconducting cable joint according to claim 2, characterized in that the pipe connection assembly (30) further comprises a second cladding pipe (24);

the second interlayer pipe (24) is connected to the inner side of the first interlayer pipe (23), and a cylinder cavity of the second sleeve (22) and a cylinder cavity of the second interlayer pipe (24) are jointly enclosed into the cable cavity (50); the second interlayer pipe (24) is provided with a second interlayer cavity, two side walls of the second interlayer cavity are used for being respectively connected to the inner layer and the outer layer of the Dewar pipe, and the second interlayer cavity forms the second heat insulation cavity.

4. Superconducting cable joint according to claim 1, characterized in that the cable connection assembly (40) comprises a connection rod (41), a first conductive drum (42) and a second conductive drum (43);

the first transmission cylinder (42) and the second transmission cylinder (43) are respectively connected to two ends of the connecting rod (41); the first conducting cylinder (42) is sleeved on one of any two adjacent cables (100), the second conducting cylinder (43) is sleeved on the other one, and the first conducting cylinder (42) and the second conducting cylinder (43) are connected with the conducting layer (101) of the cable (100) on the same side.

5. Superconducting cable joint according to claim 4, characterized in that the first conducting cylinder (42) and the second conducting cylinder (43) each comprise a first collar (401), a second collar (402) and a third collar (403);

the second lantern ring (402) is connected to one end of the first lantern ring (401), and one end of the first lantern ring (401) connected with the second lantern ring (402) is inserted between the conducting layer (101) and the insulating layer of the cable (100); the third sleeve ring (403) is sleeved on the outer side of the first sleeve ring (401) and used for pressing the conducting layer (101).

6. Superconducting cable joint according to claim 5, characterized in that the first collar (401) and/or the third collar (403) are configured with an injection hole (4011), the injection hole (4011) being used for injecting a curing agent between the first collar (401) and the third collar (403).

7. Superconducting cable joint according to claim 5, characterized in that the first and second conducting barrels (42, 43) each comprise a collar (44), the collar (44) being sleeved outside the same set of the first collar (401) and/or the third collar (403), the collar (44) being intended to be connected with the connecting rod (41).

8. Superconducting cable joint according to claim 4, characterized in that the number of cable connection assemblies (40) is a plurality of groups;

each cable (100) is provided with a plurality of conducting layers (101) which are sequentially sleeved from inside to outside along the radial direction, each conducting layer (101) is provided with a connecting section, and the connecting sections are exposed at intervals along the axial direction of the cable (100); the two connecting sections which are arranged along the exposure direction on the two cables (100) and correspond to each other along the radial direction are a group, each group of connecting sections corresponds to one group of cable connecting assemblies (40), and the connecting rods (41) in the multiple groups of cable connecting assemblies (40) are arranged around the axis of the cables (100) at intervals.

9. The superconducting cable joint according to claim 1, further comprising at least two support brackets (80), and wherein the at least two support brackets (80) are arranged at intervals in an axial direction of the pipe connection assembly (30) and are both connected to the pipe connection assembly (30).

10. A superconducting cable device comprising a plurality of superconducting cable joints according to any one of claims 1 to 9, and further comprising a plurality of superconducting cable bodies, one superconducting cable joint being connected between any adjacent ones of the superconducting cable bodies.