CN114336102B - Superconducting cable joints and devices - Google Patents

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 component and a cable connection component. The tube connection assembly is used to connect between any adjacent Dewar tubes and is configured with a cable cavity for accommodating cables, and the cable connection assembly is used to connect between any adjacent cables and is accommodated in the cable cavity. Through such an arrangement, a complete sealed channel can be formed around the cable, so as to ensure that the filled liquid nitrogen can flow normally at the joint without leakage, so as to improve the power transmission capacity of the cable. At the same time, the pipe connection assembly can form a first heat insulation cavity and a second heat insulation cavity wrapped around the outer circumference of the cable cavity to ensure the continuity and sealing of the connection of the outer heat insulation layer of the liquid nitrogen at the joint, so that the liquid nitrogen filled around the cable will not quickly exchange heat with the external environment at the joint to ensure the superconducting transmission capacity of the cable at the joint.

Description

Superconducting cable joints and devices

technical field

The invention relates to the technical field of superconducting cables, in particular to superconducting cable joints and devices.

Background technique

With the rapid development of large cities, higher requirements are placed on the power supply capacity of power transmission equipment, and conventional copper conductors are difficult to meet this requirement. Therefore, superconducting cables are needed to solve the large current transmission of transmission lines. 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 its superconducting performance. When the line length reaches a certain level, a single large-length superconducting cable cannot meet the production, transportation, and construction requirements. Therefore, multiple short superconducting cables need to be connected to form. At present, the intermediate joints commonly used for cable connection can only realize the connection of the electric power channel of the cable, but cannot guarantee the superconducting performance of the cable at this joint.

Contents of the invention

Based on this, it is necessary to provide a superconducting cable joint for the problem that the existing cable connection joint cannot guarantee the superconducting performance of the cable at the joint.

A superconducting cable joint includes a pipe connection component and a cable connection component. The pipe connection assembly is used to connect between any adjacent Dewar pipes; the pipe connection assembly is configured with a cable chamber for accommodating cables, and a first heat insulation chamber and a second heat insulation chamber wrapped around the outer peripheral side of the cable chamber, and the first heat insulation chamber is wrapped around the outer periphery of the second heat insulation chamber, and the second heat insulation chamber communicates with the sealed space in the same side of the Dewar pipe; the cable connection assembly is used to connect between any adjacent cables, and the cable connection assembly is accommodated in the cable chamber.

In one of the embodiments, the tube connection assembly includes a first sleeve, a second sleeve and a first interlayer tube; the second sleeve is sleeved on the outside of the first sleeve, the first interlayer tube has a first interlayer cavity, and the two side walls of the first interlayer cavity are respectively connected to the ends of the first sleeve and the second sleeve to jointly enclose the first heat-insulating cavity.

In one of the embodiments, the tube connection assembly further includes a second interlayer tube; the second interlayer tube is connected to the inner side of the first interlayer tube, and the cylinder cavity of the second sleeve and the lumen of the second interlayer tube together form the cable cavity; the second interlayer tube has a second interlayer cavity, and the two side walls of the second interlayer cavity are respectively used to connect to the inner and outer layers of the Dewar tube, and the second interlayer cavity forms the second heat insulation cavity.

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

In one of the embodiments, both the first conductive cylinder and the second conductive cylinder include a first collar, a second collar and a third collar; the second collar is connected to one end of the first collar, and the end of the first collar connected to the second collar is inserted between the conductive layer and the insulating layer of the cable; the third collar is sleeved on the outside of the first collar and is used to press the conductive layer.

In one of the embodiments, the first collar and/or the third collar are configured with injection holes, and the injection holes are used for injecting curing agent between the first collar and the third collar.

In one embodiment, both the first conduction cylinder and the second conduction cylinder include a hoop, the hoop is sleeved on the outside of the first collar and/or the third collar in the same group, and the hoop is used to connect with the connecting rod.

In one of the embodiments, the number of the cable connection assemblies is multiple groups; each of the cables has a plurality of conductive layers sheathed sequentially from inside to outside in the radial direction, and each of the conductive layers has a connecting section, and the plurality of connecting sections are exposed at intervals along the axial direction of the cable; two connecting sections arranged along the exposed direction on the two cables and corresponding in the radial direction form a group, each group of connecting sections corresponds to a group of the cable connecting assemblies, and the connecting rods in the multiple groups of the cable connecting assemblies are arranged at intervals around the axis of the cable.

In one embodiment, the superconducting cable joint further includes at least two support frames, and at least two support frames are arranged at intervals along the axial direction of the pipe connection assembly and are both connected to the pipe connection assembly.

The present invention also provides a superconducting cable device, which can solve at least one of the above technical problems.

A superconducting cable device includes the above-mentioned superconducting cable joint, and also includes a plurality of superconducting cable bodies, and one superconducting cable joint is connected between any adjacent superconducting cable bodies.

Beneficial effects of the present invention:

A superconducting cable joint includes a pipe connection component and a cable connection component. The tube connection assembly is used to connect between any adjacent Dewar tubes and is configured with a cable cavity for accommodating cables, and the cable connection assembly is used to connect between any adjacent cables and is accommodated in the cable cavity. With such an arrangement, the cable cavity formed by the pipe connection component can communicate with the inner cavity of the Dewar tube for accommodating cables and form a complete sealed channel, so as to ensure that the filled liquid nitrogen can circulate normally at the joint without leakage. At the same time, through the above arrangement, the second heat insulation chamber in the pipe connection assembly communicates with the sealed space in the Dewar tube on the same side, and the first heat insulation chamber is wrapped around the outer peripheral side of the second heat insulation chamber, thereby ensuring the continuity and sealing of the connection of the outer heat insulation layer of the liquid nitrogen at the joint, so that the liquid nitrogen filled around the cable will not rapidly exchange heat with the external environment at the joint, so as to ensure that the superconducting transmission capacity of the cable will not be affected at the joint.

Description of drawings

Figure 1 is an overall schematic diagram 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 provided by an embodiment of the present invention;

Fig. 3 is a partial enlarged view of place A in Fig. 2;

Fig. 4 is a schematic diagram of the first sleeve in the superconducting cable joint provided by the embodiment of the present invention;

Fig. 5 is a schematic diagram of the second sleeve in the superconducting cable joint provided by the embodiment of the present invention;

Fig. 6 is a schematic diagram of the first interlayer tube in the superconducting cable joint provided by the embodiment of the present invention;

Fig. 7 is a sectional view of the second interlayer tube in the superconducting cable joint provided by the embodiment of the present invention;

Fig. 8 is an exploded view of the cable connection assembly in the superconducting cable joint provided by the embodiment of the present invention;

Fig. 9 is a schematic diagram of a conductive cylinder in a superconducting cable joint provided by an embodiment of the present invention;

Fig. 10 is a schematic diagram of the installation of the conductive cylinder in the superconducting cable joint provided by the embodiment of the present invention;

Fig. 11 is a schematic diagram of the connection of the cable connection components in the superconducting cable joint provided by the embodiment of the present invention;

Fig. 12 is a schematic diagram of a support frame in a superconducting cable joint provided by an embodiment of the present invention.

Reference numerals: 11-outer Dewar tube; 12-inner Dewar tube; 21-first sleeve; 211-exhaust valve; 212-first connecting ring; 22-second sleeve; 221-second connecting ring; 23-first sandwich tube; 231-outer tube; 232-inner tube; 243-inner connecting section; 244-outer connecting section; 25-first connecting piece; 26-second connecting piece; 30-pipe connecting component; 40-cable connecting component; 401-first collar; 4011-injection hole; 7-nut piece; 48-screw; 50-cable cavity; 80-support frame; 81-support seat; 82-roller frame; 83-roller; 100-cable;

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" etc. The orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise specified and limited, a first feature being "on" or "under" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or there may be an intervening element. 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. As used herein, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions are for the purpose of illustration only and are not intended to represent the only embodiments.

Referring to Fig. 1 and Fig. 2, Fig. 1 shows an overall schematic diagram of a superconducting cable joint in an embodiment of the present invention, and Fig. 2 shows an overall cross-sectional view of a superconducting cable joint in an embodiment of the present invention. An embodiment of the present invention also provides a superconducting cable device, including a superconducting cable joint and a plurality of superconducting cable bodies. When in use, a superconducting cable connector 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 the electrical connection is realized through the cable connecting assembly 40 in the tube connecting assembly 30 of the superconducting cable joint, so as to form a complete electrical transmission channel between the two adjacent cable bodies; at the same time, the tube connecting assembly 30 can connect the Dewar tubes where the two adjacent cable bodies are located, so as to form a channel for the flow of liquid nitrogen and a continuous heat insulation layer at the joint, thereby ensuring the superconductivity of the two adjacent cables. The following is a specific description of the superconducting cable joint.

Please refer to Figure 1 and Figure 2. In some embodiments, the superconducting cable joint includes a tube connection assembly 30 and a cable connection assembly 40 . Wherein, the pipe connection assembly 30 is used to connect between any adjacent Dewar pipes; the pipe connection assembly 30 is configured with a cable chamber 50 for accommodating the cable 100, and a first heat insulation chamber and a second heat insulation chamber wrapped around the outer peripheral side of the cable chamber 50, and the first heat insulation chamber is wrapped around the outer periphery of the second heat insulation chamber, and the second heat insulation chamber communicates with the sealed space in the Dewar pipe on the same side. Meanwhile, the cable connection assembly 40 is used to connect between any adjacent cables 100 , and the cable connection assembly 40 is accommodated in the cable cavity 50 .

Specifically, the two ends of the pipe connection assembly 30 along its own axial direction are respectively connected between two adjacent Dewar pipes, and the cable cavity 50 of the pipe connection assembly 30 can communicate with the inner Dewar pipes 12 in the two adjacent Dewar pipes, and connect the heat insulation layers in the two adjacent Dewar pipes through the first heat insulation chamber and the second heat insulation chamber. The cables 100 located in two adjacent Dewar tubes are respectively inserted into the cable chamber 50 of the pipe connection assembly 30 from both axial ends of the pipe connection assembly 30 , and electrically connected through the cable connection assembly 40 in the cable chamber 50 . Through such arrangement, two adjacent cables 100 can be electrically connected at the joint of the superconducting cable, so as to realize the purpose of the cable 100 to transmit electric power; at the same time, while the cable chamber 50 provides the necessary space for the electrical connection of the cable 100, it can also ensure that the liquid nitrogen in the two adjacent Dewars can circulate at the joint of the superconducting cable, so that the cable 100 can also be in a working environment wrapped in liquid nitrogen at the joint of the superconducting cable, so as to ensure the superconducting transmission capacity of the cable 100. In addition, the first heat insulation chamber wrapped around the outer peripheral side of the cable chamber 50 provides a heat insulation layer for the liquid nitrogen at the joint of the superconducting cable; the second heat insulation chamber communicates with the sealed space in the Dewar tube on the same side, ensuring the relative sealing of the heat insulation layer in the Dewar tube. Through the setting of the first heat insulation cavity and the second heat insulation cavity and the first heat insulation cavity wrapped on the outer peripheral side of the second heat insulation cavity, the heat insulation layer of the pipe connection assembly 30 and the heat insulation layer in the Dewar tube can realize a complete sealed connection at the joint of the superconducting cable, avoiding the leakage of liquid nitrogen at the joint of the superconducting cable and heat exchange with the external environment, and ensuring the reliability of heat insulation of liquid nitrogen at the joint of the superconducting cable.

Please refer to Fig. 3, Fig. 4, Fig. 5 and Fig. 6, Fig. 3 is a partially enlarged view of Fig. 2 at A place, Fig. 4 shows a schematic diagram of the first sleeve in an embodiment of the present invention; Fig. 5 shows a schematic diagram of a second sleeve in an embodiment of the present invention, and Fig. 6 shows a schematic diagram of the first sandwich pipe in an embodiment of the present invention. In some embodiments, the pipe connection assembly 30 includes a first sleeve 21, a second sleeve 22, and a first interlayer tube 23; the second sleeve 22 is sleeved on the outside of the first sleeve 21, the first interlayer tube 23 has a first interlayer cavity, and the two side walls of the first interlayer cavity are respectively connected to the ends of the first sleeve 21 and the second sleeve 22, so as to jointly enclose a first heat insulation cavity.

Specifically, both the first sleeve 21 and the second sleeve 22 are hollow cylindrical, the first sleeve 21 is coaxially sleeved on the outside of the second sleeve 22, the first connecting ring 212 is installed at both ends of the first sleeve 21, and the second connecting ring 221 is connected at both ends of the second sleeve 22. The first interlayer tube 23 includes an outer layer tube 231 and an inner layer tube 232 arranged coaxially. The outer layer tube 231 is sleeved on the outside of the inner layer tube 232, and one end of the two is aligned and sealed, thereby forming a first interlayer cavity between the outer layer tube 231 and the inner layer tube 232. Wherein, the ends of the outer tube 231 and the inner tube 232 away from the sealed connection end are respectively connected with an outer connecting piece 234 and an inner connecting piece 233 . When installing, the outer connecting piece 234 and the first connecting ring 212 are connected by the first connecting piece 25, and the inner connecting piece 233 and the second connecting ring 221 are connected by the second connecting piece 26, and a sealing ring is evenly pressed on the compression surface between the outer connecting piece 234 and the first connecting piece 25, the first connecting ring 212 and the first connecting piece 25, the inner connecting piece 233 and the second connecting piece 26, and the second connecting ring 221 and the second connecting piece 26. Through such arrangement, the space region between the first sleeve 21 and the second sleeve 22 and the first interlayer cavity jointly form the first heat-insulating cavity, so that the superconducting cable joint also has a heat-insulating layer to insulate the liquid nitrogen flowing through the superconducting cable joint; by setting the sealing ring, the sealing of the connection between the first sleeve 21, the second sleeve 22 and the first interlayer pipe 23 is improved, and the reliability of the heat insulation of the first heat-insulating cavity is guaranteed; meanwhile, through the setting of the first connecting piece 25 and the second connecting piece 26 , it can ensure that the first interlayer tube 23 with a smaller diameter can be transitionally connected with the first sleeve 21 and the second sleeve 22 with a larger diameter, which is convenient for production and processing while ensuring the aesthetics outside the first heat insulation cavity and the connectivity inside the cavity.

It should be added that the first sleeve 21 and the second sleeve 22 are equipped with first interlayer tubes 23 at both ends, and the first sleeve 21, the second sleeve 22 and the two first interlayer tubes 23 are jointly surrounded by the joint of the superconducting cable to form an independent and sealed heat insulation layer relative to the Dewar tube. Through such setting, it is convenient to set the heat insulation layer into a vacuum state later, so as to improve the singleness of the superconducting cable joint.

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

Please refer to FIG. 2 , FIG. 3 and FIG. 7 . FIG. 7 shows a cross-sectional view of the second sandwich pipe in an embodiment of the present invention. In some embodiments, the pipe connection assembly 30 further includes a second interlayer pipe 24; the second interlayer pipe 24 is connected to the inner side of the first interlayer pipe 23, and the cylinder cavity of the second sleeve 22 and the lumen of the second interlayer pipe 24 jointly define a cable chamber 50; the second interlayer pipe 24 has a second interlayer chamber, and the two side walls of the second interlayer chamber are used to respectively connect to the inner and outer layers of the Dewar tube, and the second interlayer chamber forms a second heat insulation chamber.

Specifically, the second interlayer tube 24 includes an outer sealing tube 241 and an inner sealing tube 242 arranged coaxially, the outer sealing tube 241 is sleeved on the outside of the inner sealing tube 242, and one end of the two is aligned and sealed, thereby forming a second interlayer cavity between the outer sealing tube 241 and the inner sealing tube 242. Wherein, the ends of the outer sealing tube 241 and the inner sealing tube 242 away from the sealed connection are respectively connected with an outer connecting section 244 and an inner connecting section 243 , and a connecting flange is provided at the end of the outer connecting section 244 away from the outer sealing tube 241 . During installation, the two second interlayer pipes 24 are respectively installed at opposite ends of two adjacent Dewar pipes, and are respectively connected with the two first interlayer pipes 23 . Wherein, one end of the inner connecting section 243 away from the inner sealing tube 242 is fixedly connected to the inner Dewar tube 12, and one end of the outer connecting section 244 provided with a flange is fixedly connected to the outer Dewar tube 11, thereby forming a sealed second heat-insulating chamber; the end of the second interlayer tube 24 away from the Dewar tube is inserted from the end of the first interlayer tube 23 away from the first sleeve 21 and abutted against the end surface of the inner connecting piece 233 away from the first sleeve 21, and the outer connecting section 244 is connected by bolts The upper flange is fixedly connected to the end of the first interlayer pipe 23 away from the first sleeve 21 . Simultaneously, the outer sidewall of the outer sealing tube 241 away from the inner sealing tube 242 and the inner sidewall of the inner layer tube 232 away from the outer layer tube 231 are compressed together, and a sealing ring is pressed on the pressing surface between the outer sealing tube 241 and the inner layer tube 232, and between the second interlayer tube 24 and the inner connecting piece 233. Through such arrangement, the cylinder cavity of the second sleeve 22 and the inner side of the inner sealing tube 242 jointly form a cable cavity 50 for accommodating the cable 100 and liquid nitrogen; the second interlayer tube 24 abuts against the inner connecting piece 233 and a sealing ring is pressed on the pressing surface to improve the sealing of the cable cavity 50 and prevent the liquid nitrogen flowing through the cable cavity 50 from leaking there. At the same time, by pressing the outer sealing tube 241 and the inner layer tube 232 together, the first heat insulation chamber and the second heat insulation chamber can have overlapping parts, which ensures the continuity of the connection of the heat insulation layer at the joint of the superconducting cable, so as to play an effective heat insulation effect; and by pressing the sealing ring on the pressing surface, the leakage of liquid nitrogen from this place is further prevented.

What needs to be added is that in a specific embodiment, the position where the flange on the outer connecting section 244 and the first interlayer pipe 23 are connected by bolts should leave a certain gap after tightening. Through such an arrangement, it can be ensured that the second interlayer tube 24 has been tightly abutted against the inner connecting piece 233 , thereby further ensuring that the liquid nitrogen in the cable chamber 50 will not leak.

In some embodiments, the number of the second interlayer tube 24 is one, and the two ends of the second interlayer tube 24 are respectively connected between two adjacent Dewar tubes, and run through the lumen of the second sleeve 22 and the lumens of the two second interlayer tubes 24 .

Please refer to Fig. 2 and Fig. 8, Fig. 8 shows an exploded view of the cable connection assembly in an embodiment of the present invention. In some embodiments, the cable connection assembly 40 includes a connecting rod 41, a first conducting cylinder 42, and a second conducting cylinder 43; the first conducting cylinder 42 and the second conducting cylinder 43 are respectively connected to both 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, and both the first conducting cylinder 42 and the second conducting cylinder 43 are connected to the conductive layer 101 of the cable 100 on the same side.

Specifically, after the skeletons of the inner layers of two adjacent cables 100 are connected, the first conductive cylinder 42 and the second conductive cylinder 43 are sleeved on the conductive layers 101 of the two cables 100 respectively, and are respectively fixed relative to the cables 100 so that they cannot be displaced relative to the cables 100. Both ends of the connecting rod 41 are fixedly connected to the first conducting cylinder 42 and the second conducting cylinder 43 respectively. Through such an arrangement, the same conductive layers 101 of two adjacent cables 100 can be connected to enable power transmission; at the same time, two adjacent cables 100 can be axially fixedly connected to prevent the two connected cables 100 from being disconnected due to excessive axial tension.

Please refer to FIG. 9 and FIG. 10 , FIG. 9 shows a schematic diagram of the conduction cylinder in an embodiment of the present invention, and FIG. 10 shows a schematic diagram of the installation of the conduction cylinder in an embodiment of the present invention. In some embodiments, both the first conductive cylinder 42 and the second conductive cylinder 43 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 the end of the first collar 401 connected to the second collar 402 is inserted between the conductive layer 101 and the insulating layer of the cable 100 ;

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 its axial direction, and a plurality of annular injection grooves 4012 are configured at intervals along the axial direction on the outer wall of the small end, and the plurality of annular injection grooves 4012 are connected through linear grooves along the axial direction of the first collar 401; the end of the large end facing the small end is provided with an annular protruding ring. One end of the second collar 402 is fixedly connected with the small end of the first collar 401 , and the other end of the second collar 402 protrudes along its circumferential direction with a retaining ring. The third collar 403 is provided with a plurality of compression rings at intervals along its axial direction on its inner wall. During installation, the third collar 403 is set on the cable 100 first, and the end of the first collar 401 connected with the second collar 402 is inserted between the conductive layer 101 and the insulating layer of the cable 100, so that the conductive layer 101 is tightly wrapped on the small end of the first collar 401 and the outer wall of the second collar 402; The inner wall of the end facing the large end of the first collar 401 can be tightly attached to the outer wall of the protruding ring, and the pressing ring of the third collar 403 can tightly press the conductive layer 101 on the outer wall of the small end. Through such arrangement, the conductive layer 101 of the cable 100 can be led out to the outer surface of the cable 100 , so as to connect the conductive layers 101 of two adjacent cables 100 through the connecting rod 41 . At the same time, the end face of the retaining ring in the second collar 402 towards the large end and the end face of the large end of the first collar 401 and the end of the protruding ring towards the small end form an axial seal on the space between the first collar 401 and the third collar 403 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 between the first collar 401 and the third collar 403.

In other embodiments, the second collar 402 can be welded together with the end surface of the small end of the first collar 401 through the end surface away from the end of the retaining ring, or the inner wall of the second collar 402 can be sleeved on the outer wall of the small end of the first collar 401 .

Please continue with Figure 9. In some embodiments, both the first collar 401 and the third collar 403 are configured with injection holes 4011 for injecting the curing agent between the first collar 401 and the third collar 403 . Specifically, the injection hole 4011 is configured on the outer wall of the large end of the first collar 401 and the outer wall of the third collar 403, wherein the injection hole 4011 on the first collar 401 communicates with the linear groove and the injection groove 4012 on the small end, and the injection hole 4011 on the third collar 403 communicates with its inner wall. Through such arrangement, when 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 entire space between the first collar 401 and the third collar 403. After the curing agent is solidified, the connection between the conductive layer 101 and the first collar 401, the second collar 402 and the third collar 403 is stronger.

In other embodiments, the outer wall of the large end of the first collar 401 is configured with an injection hole 4011 communicating with the linear groove on the small end and the injection groove 4012; or the outer wall of the third collar 403 is configured with an injection hole 4011 communicated with its inner wall. The curing agent can fill the entire space 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 a specific embodiment, the curing agent is liquid solder, which is liquid after heating and solid at normal temperature.

See Figure 8. In some embodiments, both the first conduction cylinder 42 and the second conduction cylinder 43 include a hoop 44 sleeved on the outside of the first collar 401 of the same set, and the hoop 44 is used to connect with the connecting rod 41 . Specifically, the clamp 44 is formed by fastening two half-rings with connecting ears. After the two half-rings are fastened to the outside of the first collar 401, the connecting ears of the two half-rings can be pressed together and fixed by nut pieces 47 and screws 48, so that the clamp 44 can be tightly sleeved on the outside of the first collar 401. At the same time, the two ends of the connecting rod 41 are respectively fixedly connected to the clips 44 on the first conducting cylinder 42 and the second conducting cylinder 43 through the nut piece 47 and the screw 48 for fixedly connecting the two half-rings. Through such arrangement, it is convenient to fixedly connect the connecting rod 41 to the first conducting cylinder 42 and the second conducting cylinder 43; at the same time, a power transmission channel composed of the first collar 401 of the first conducting cylinder 42, the clamp 44 of the first conducting cylinder 42, the connecting rod 41, the clamp 44 of the second conducting cylinder 43 and the first collar 401 of the second conducting cylinder 43 can be formed between two adjacent cables 100, so as to realize electrical transmission.

It should be added that each clamp 44 sleeved on the outside of the first collar 401 has two opposite connecting ears, that is, the first conducting cylinder 42 and the second conducting cylinder 43 are connected by two connecting rods 41, and the two connecting rods 41 are arranged on both sides of the cable 100 along the axis direction of the cable 100. Through such setting, it can ensure that the two adjacent cables 100 are evenly stressed at the connection, and avoid the cable 100 from being broken or bent due to uneven force at the connection; at the same time, the electrical transmission efficiency between the two adjacent cables 100 can also be improved.

In some embodiments, the hoops 44 are sheathed on the outside of the third collar 403 of the same set, or one of the hoops 44 is sheathed on the outside of the third collar 403 , and the other hoop 44 is sheathed on the outside of the first collar 401 .

In some other embodiments, an insulating sleeve 45 is sheathed on the outside of the connecting rod 41 , and an insulating cover 46 is provided on both ends of the connecting rod. Through such arrangement, the insulation of the connecting rod 41 and its two ends can be improved, so as to avoid mutual discharge between two adjacent connecting rods 41 .

Please refer to FIG. 11 . FIG. 11 shows a connection diagram of the cable connection assembly in an embodiment of the present invention. In some embodiments, the number of cable connection assemblies 40 is multiple groups; each cable 100 has a plurality of conductive layers 101 that are sheathed sequentially from the inside to the outside in the radial direction, and each conductive layer 101 has a connection section, and the plurality of connection sections are exposed at intervals along the axial direction of the cable 100; two connection sections arranged along the exposed direction on the two cables 100 and corresponding to the radial direction are used as a group. layout.

Specifically, each set of cable connection assemblies 40 includes a first conducting cylinder 42 , a second conducting cylinder 43 and two connecting rods 41 . When connecting, a plurality of first conduction cylinders 42 and second conduction cylinders 43 are respectively fixedly sleeved on a plurality of connection sections on two adjacent cables 100; the opposite inner frame ends of two adjacent cables 100 are fixedly connected together by welding, and the corresponding shielding layers and insulating layers on the two inner frames are wrapped and connected by shielding tape and insulating tape respectively. The first conduction cylinder 42 and the second conduction cylinder 43 on each group of connection sections are conductively connected by two connection rods 41 of the same length. The two connecting rods 41 in each group of connecting segments are distributed on both sides of the cable 100 with the axis of the cable 100 as the axis of symmetry, and the connecting rods 41 in multiple groups of connecting segments are arranged at intervals along the axis of the cable 100 . Among them, different connecting segment groups have the same first conducting cylinder 42 and second conducting cylinder 43 and two connecting rods 41 of different lengths; Through such an arrangement, multiple groups of cable connection assemblies 40 connect all the conductive layers 101 of two adjacent cables 100 , so as to realize low loss of electrical transmission between two adjacent cables 100 . At the same time, a plurality of connecting rods 41 in multiple groups of connecting sections are arranged at intervals around the axis of the cable 100, which can improve the uniformity of the electric field distribution of two adjacent cables 100 and the electrical performance of the entire superconducting cable joint.

See Figure 4 and Figure 12. Fig. 12 shows a schematic diagram of a support frame in an embodiment of the present invention. In some embodiments, the superconducting cable joint further includes at least two support frames 80 , and the at least two support frames 80 are arranged at intervals along the axial direction of the pipe connection assembly 30 and are both connected to the pipe connection assembly 30 . Specifically, the support frame 80 is composed of a support seat 81 , a roller frame 82 and a roller 83 . One side of the supporting base 81 is configured with an arc-shaped groove having the same diameter as the first sleeve 21 , and the side of the supporting base 81 away from the arc-shaped groove is equipped with a roller 83 via a roller frame 82 . When in use, the support frame 80 engages the arc-shaped groove of the support base 81 on the outer side wall of the first sleeve 21 and is fixedly connected with the first sleeve 21 . Through such setting, the superconducting cable joint in this application can provide support, and during the process of moving the superconducting cable joint, the sliding friction with the ground can be converted into rolling friction by the roller 83, so as to facilitate the movement.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (6)

1. A superconducting cable joint, characterized in that the superconducting cable joint comprises: The pipe connection assembly (30) is used to connect between any adjacent Dewar pipes; the pipe connection assembly (30) is configured with a cable chamber (50) for accommodating the cable (100), and a first heat insulation chamber and a second heat insulation chamber wrapped around the outer peripheral side of the cable chamber (50), and the first heat insulation chamber is wrapped around the outer peripheral side of the second heat insulation chamber, and the second heat insulation chamber communicates with the sealed space in the Dewar pipe on the same side; a cable connection assembly (40), used to connect between any adjacent cables (100), and the cable connection assembly (40) is accommodated in the cable cavity (50); The pipe connection assembly (30) includes a first sleeve (21), a second sleeve (22) and a first interlayer pipe (23); the second sleeve (22) is sheathed on the outside of the first sleeve (21), the first interlayer pipe (23) has a first interlayer cavity, and the two side walls of the first interlayer cavity are respectively connected to the ends of the first sleeve (21) and the second sleeve (22), so as to jointly enclose the first heat insulation cavity; The pipe connection assembly (30) also includes a second interlayer pipe (24); the second interlayer pipe (24) is connected to the inner side of the first interlayer pipe (23), and the lumen of the second sleeve (22) and the lumen of the second interlayer pipe (24) jointly surround the cable chamber (50); the second interlayer pipe (24) has a second interlayer chamber, and the two side walls of the second interlayer chamber are used to be respectively connected to the inner and outer layers of the Dewar tube, and the second interlayer chamber forms the second interlayer chamber. insulation cavity; The cable connection assembly (40) includes a connecting rod (41), a first conducting cylinder (42) and a second conducting cylinder (43); the first conducting cylinder (42) and the second conducting cylinder (43) are respectively connected to both 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, and the first conducting cylinder (42) and the second conducting cylinder (43) are all connected to the conductive layer (101) of the cable (100) on the same side; Both the first conducting cylinder (42) and the second conducting cylinder (43) 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) connected to the second collar (402) is inserted between the conductive layer (101) and the insulating layer of the cable (100); the third collar (403 ) is sleeved on the outside of the first collar (401), and is used to press the conductive layer (101). 2. The superconducting cable joint according to claim 1, characterized in that, the first collar (401) and/or the third collar (403) are configured with an injection hole (4011), and the injection hole (4011) is used to inject a curing agent between the first collar (401) and the third collar (403). 3. The superconducting cable joint according to claim 1, characterized in that, both the first conducting cylinder (42) and the second conducting cylinder (43) include a clamp (44), the clamp (44) is sleeved on the outside of the first collar (401) and/or the third collar (403) of the same group, and the clamp (44) is used to connect with the connecting rod (41). 4. The superconducting cable joint according to claim 1, characterized in that, the number of the cable connection assemblies (40) is multiple groups; Each of the cables (100) has a plurality of conductive layers (101) sheathed radially from the inside to the outside, and each of the conductive layers (101) has a connection section, and the plurality of connection sections are exposed at intervals along the axial direction of the cable (100); the two connection sections arranged in the direction of exposure on the two cables (100) and corresponding in the radial direction form a group, and each group of connection sections corresponds to a group of the cable connection components (40), and multiple groups of the connection rods (40) in the cable connection components (40) 1) Arranged at intervals around the axis of the cable (100). 5. The superconducting cable joint according to claim 1, characterized in that, the superconducting cable joint further comprises at least two support frames (80), and at least two of the support frames (80) are arranged at intervals along the axial direction of the pipe connection assembly (30) and are all connected to the pipe connection assembly (30). 6. A superconducting cable device, comprising a plurality of superconducting cable joints according to any one of claims 1 to 5, and further comprising a plurality of superconducting cable bodies, one superconducting cable joint is connected between any adjacent superconducting cable bodies.