A superconducting current lead component

Abstract

The present invention discloses a superconducting current lead component, and relates to the technical field of superconducting current drainage. It comprises an insulating layer, a sealed vacuum tube for passing liquid nitrogen is arranged inside the insulating layer, a spoiler assembly is arranged on the insulating layer, a plurality of guide assemblies for guiding are arranged inside the sealed vacuum tube, a connection terminal for connecting with a superconducting cable end is arranged at one end of the sealed vacuum tube, and a connection assembly for connecting with a normal conductive cable is arranged at the other end. The present invention is provided with a sealed vacuum tube, a plurality of copper tubes with hollow holes arranged inside the sealed vacuum tube, a plurality of superconducting tapes stacked inside the copper tube, connection terminals respectively arranged at both ends of the sealed vacuum tube, and the connection assemblies cooperate with each other, and drainage is performed through the copper tube and the superconducting tape, and a thinner copper section can be used to reduce the use of copper materials, and the outer diameter of the high-voltage bushing matched therewith and the required insulation space are reduced, so that materials can be saved and the cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of superconducting current drainage, in particular to a superconducting current lead component. Background Art

[0002] When superconducting cables are connected to the grid, they need to transition from the superconducting state to the normal conducting state. This is achieved by using a terminal thermostat, such as Figure 1 The superconducting cable is inserted horizontally from the terminal thermostat entrance and is softly connected to the vertical current lead through a special current terminal at a right angle. The connection end is inside the liquid nitrogen. The current lead is inside the high-voltage bushing and leads out from the upper port, and is finally connected to the conventional cable.

[0003] The current lead is a key component of the terminal thermostat and an important medium connecting the superconducting cable and the conventional cable. It completes the transition of the conductor from the superconducting state to the normal conducting state and the transition of the ambient temperature from low temperature to normal temperature. The current lead is above the surface of liquid nitrogen and transitions to normal temperature through a temperature gradient. It is usually made of copper cable or copper tube material and is covered with insulation. Due to the large capacity of the superconducting cable, when it is converted to normal conduction, the copper cross-section must be very thick to have a greater current carrying capacity. The amount of copper used is large, and the outer diameter of the high-voltage bushing matched therewith and the required insulation space must be large, resulting in material waste and high cost. Therefore, the present invention proposes a new type of superconducting current lead component. Summary of the invention

[0004] The object of the present invention is to provide a superconducting current lead component to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a superconducting current lead component, comprising an insulating layer, a sealed vacuum tube for passing liquid nitrogen is arranged inside the insulating layer, a spoiler component is arranged on the insulating layer, a plurality of flow guiding components for guiding flow are arranged inside the sealed vacuum tube, a connecting terminal for connecting to a superconducting cable end is arranged at one end of the sealed vacuum tube, and a connecting component for connecting to a conventional conductive cable is arranged at the other end.

[0006] Preferably, the flow guide component comprises a copper tube, a plurality of hollow holes are formed on the copper tube, and a plurality of superconducting tapes distributed in a serpentine shape are arranged inside the copper tube.

[0007] Preferably, the sealed vacuum tube comprises an outer tube, an inner tube is arranged inside the outer tube, a vacuum interlayer is formed between the inner tube and the outer tube, and an air extraction valve is arranged on the outer tube.

[0008] Preferably, a bolt connection hole and a plurality of liquid nitrogen channels are provided on the connection end.

[0009] Preferably, the connection assembly includes a lead-out terminal, the lead-out terminal is provided with a flange, and the flange is fixedly connected to the lead-out terminal via an insulating sleeve.

[0010] Preferably, the lead-out terminal, the insulating sleeve and the flange are all provided with exhaust passages for passing liquid nitrogen, the exhaust passages are interconnected and a first airtight valve is provided in the exhaust passages.

[0011] Preferably, the spoiler assembly includes a plurality of spoiler plates, and every two adjacent spoiler plates are fixedly connected via a polytetrafluoroethylene connecting column.

[0012] Preferably, the insulating layer comprises an insulating sleeve, and a stress cone is provided on the insulating sleeve.

[0013] Preferably, the connecting terminal and the lead-out terminal are respectively provided with a plurality of first welding holes and a plurality of second welding holes.

[0014] Preferably, one end of the outer tube and the inner tube are fixedly connected to the connecting end, and the other end are fixedly connected to the lead-out end.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The superconducting current lead component is provided with a closed vacuum tube, a plurality of copper tubes with hollow holes provided inside the closed vacuum tube, a plurality of superconducting tapes stacked inside the copper tube, connecting terminals respectively provided at both ends of the closed vacuum tube and the connection components cooperate with each other, and current is drained through the copper tube and the superconducting tape. A thinner copper section can be used to reduce the amount of copper material used, and the outer diameter of the high-voltage bushing matched therewith and the required insulation space are reduced, so that materials can be saved and the cost is low.

[0017] The superconducting current lead component, through the cooperation between the multiple spoilers arranged on the insulating layer and the polytetrafluoroethylene connecting columns fixedly connected between the spoilers, can hinder, buffer or interfere with the vertical rising path of nitrogen evaporation on the surface of liquid nitrogen in the terminal thermostat, slow down the evaporation speed and reduce the heat leakage loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of a drainage device in the prior art;

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the superconducting flow guide component of the present invention;

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure of the connection terminal of the present invention;

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the connection assembly of the present invention;

[0022] Figure 5 It is a schematic diagram of the three-dimensional structure of the sealed vacuum tube and the flow guide assembly of the present invention;

[0023] Figure 6 It is a schematic diagram of the three-dimensional structure of the sealed vacuum tube of the present invention;

[0024] Figure 7 It is a schematic diagram of the three-dimensional structure of the flow guide assembly of the present invention;

[0025] Figure 8 It is a schematic diagram of the three-dimensional structure of the flow-around assembly of the present invention;

[0026] Fig. 9 It is a schematic diagram of the three-dimensional structure of the insulating layer of the present invention.

[0027] In the figure: 1. connecting end; 11. bolt connection hole; 12. first welding hole; 13. liquid nitrogen channel; 2. connecting assembly; 21. lead-out end; 22. insulating sleeve; 23. flange; 24. exhaust channel; 25. second welding hole; 3. closed vacuum tube; 31. inner tube; 32. outer tube; 33. exhaust valve; 4. flow guide assembly; 41. copper tube; 42. superconducting tape; 43. hollow hole; 5. spoiler assembly; 51. spoiler; 52. polytetrafluoroethylene connecting column; 6. insulating layer; 61. insulating sleeve; 62. stress cone. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that, in the description of the present invention, the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0030] Furthermore, it should be understood that for the sake of ease of description, the sizes of the various components shown in the drawings are not drawn according to actual proportions. For example, the thickness or width of certain layers may be exaggerated relative to other layers.

[0031] It should be noted that like reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined or described in one drawing, it will not require further detailed discussion and description in the description of the subsequent drawings.

[0032] like Figure 1-Figure 2 As shown, the present invention provides a technical solution: a superconducting current lead component, including an insulating layer 6, a sealed vacuum tube 3 for passing liquid nitrogen is arranged inside the insulating layer 6, a spoiler component 5 is arranged on the insulating layer 6, a plurality of flow guide components 4 for flow guide are arranged inside the sealed vacuum tube 3, a connection terminal 1 for connecting to a superconducting cable end is arranged at one end of the sealed vacuum tube 3, and a connection component 2 for connecting to a conventional conductive cable is arranged at the other end. It should be noted that the flow guide component 4 includes a copper tube 41, a plurality of hollow holes 43 are opened on the copper tube 41, and a plurality of serpentine superconducting tapes 42 are arranged inside the copper tube 41.

[0033] like Figure 3 As shown, a bolt connection hole 11 and a plurality of liquid nitrogen channels 13 are provided on the connection terminal 1. It should be noted that a bolt is screwed inside the bolt connection hole 11 provided on the connection terminal 1, and is softly connected at a right angle to the dedicated current terminal through the bolt.

[0034] like Figure 4 As shown, the connection assembly 2 includes a lead-out terminal 21, a flange 23 is provided on the lead-out terminal 21, and the flange 23 is fixedly connected to the lead-out terminal 21 through an insulating sleeve 22. An exhaust channel 24 for passing liquid nitrogen is provided on the lead-out terminal 21, the insulating sleeve 22 and the flange 23. The exhaust channels 24 are interconnected and a first airtight valve is provided in the exhaust channel 24. A plurality of first welding holes 12 and second welding holes 25 are provided on the connection terminal 1 and the lead-out terminal 21, respectively. It should be explained that the first airtight valve is provided in the exhaust channel 24 provided on the flange 23. It should be noted that one end of the superconducting tape 42 and the copper tube 41 are inserted into the first welding hole 12 opened on the connecting terminal 1, and the other ends are inserted into the second welding hole 25 opened on the lead-out terminal 21, and are fixedly connected by soldering. The insulating sleeve 22 and the flange 23 can be made of polytetrafluoroethylene material with excellent high and low temperature resistance, low friction and wear, chemical corrosion resistance, high electrical strength, non-stick, weather resistance and other properties and good physical and mechanical properties. The insulating sleeve 22 and the flange 23 can ensure the insulation of the connection between the lead-out terminal 21 and the high-voltage bushing.

[0035] As a specific embodiment, when the exhaust channel 24 is opened, the liquid nitrogen in the terminal thermostat enters the inner tube 31 under pressure through the liquid nitrogen channel 13 provided on the connecting terminal 1 connected to the superconducting cable. When the liquid nitrogen overflows from the exhaust channel 24, the first airtight valve provided in the exhaust channel 24 is closed, and the liquid nitrogen remains full. It should be noted that the connecting terminal 1 is provided with a plurality of liquid nitrogen channels 13, so that the liquid nitrogen can quickly fill the inner tube 31, and cooperate with the copper tube 41 provided with a plurality of hollow holes 43, so that the superconducting tape 42 can reach the superconducting state in a relatively short time.

[0036] like Figure 5 and Figure 6 As shown, the closed vacuum tube 3 includes an outer tube 32, and an inner tube 31 is arranged inside the outer tube 32. Both the outer tube 32 and the inner tube 31 can be made of stainless steel with excellent corrosion resistance, formability and toughness, so that the service life of the outer tube 32 and the inner tube 31 is longer. A vacuum interlayer is formed between the inner tube 31 and the outer tube 32. An exhaust valve 33 is arranged on the outer tube 32 to evacuate the air between the inner tube 31 and the outer tube 32. The vacuum degree is evacuated to above 10-4Pa level by the exhaust valve 33, and then the exhaust valve 33 is closed to maintain the vacuum degree to form a vacuum layer, which plays a role of heat insulation.

[0037] As a specific embodiment, one end of the outer tube 32 and the inner tube 31 are both fixedly connected to the connecting terminal 1 , and the other end thereof are both fixedly connected to the lead-out terminal 21 .

[0038] like Figure 8 As shown, the spoiler assembly 5 includes a plurality of spoilers 51, and each two adjacent spoilers 51 are fixedly connected by a polytetrafluoroethylene connecting column 52. It should be noted that the cooperation between the spoilers 51 and the polytetrafluoroethylene connecting columns 52 fixedly connected between the spoilers 51 can hinder, buffer or interfere with the vertical rising path of nitrogen evaporation on the surface of liquid nitrogen in the terminal thermostat, slow down the evaporation speed, and reduce the heat leakage loss.

[0039] like Fig. 9 As shown, the insulating layer 6 includes an insulating sleeve 61, and a stress cone 62 is arranged on the insulating sleeve 61. It should be noted that the function of the stress cone 62 is to prevent high voltage creepage. It should be noted that the stress cone 62 and the spoiler component 5 are respectively arranged at both ends of the insulating sleeve 61.

[0040] Specifically: after the current lead component is manufactured, the sealed vacuum tube 3 (between the outer tube 32 and the inner tube 31) is first evacuated to a level above 10-4Pa, and then assembled with the high-voltage bushing; when the terminal thermostat is filled with liquid nitrogen and operated at low temperature, the first airtight valve provided in the exhaust channel 24 is opened to discharge the gas. Under the internal positive pressure condition, the liquid nitrogen fills the inner tube 31 through the liquid nitrogen channel 13 in the connecting end 1 and enters the copper tube 41 through a plurality of hollow holes 43 provided on the copper tube 41 to cool the superconducting tape 42 until the liquid nitrogen overflows the valve port of the first airtight valve, and the valve of the first airtight valve is closed. At this time, the superconducting tape 42 enters the superconducting state and fully assumes the task of conducting the flow. Even if the superconducting tape 42 has not reached the superconducting state, the copper tube 41 can also play a conducting role.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A superconducting current lead component, comprising an insulating layer (6), characterized in that: A sealed vacuum tube (3) for passing liquid nitrogen is arranged inside the insulating layer (6), a spoiler assembly (5) is arranged on the insulating layer (6), a plurality of flow guide assemblies (4) for guiding flow are arranged inside the sealed vacuum tube (3), a connection terminal (1) for connecting to a superconducting cable end is arranged at one end of the sealed vacuum tube (3), and a connection assembly (2) for connecting to a conventional conductive cable is arranged at the other end; The flow guide component (4) comprises a copper tube (41), a plurality of hollow holes (43) are provided on the copper tube (41), and a plurality of superconducting tapes (42) distributed in a serpentine shape are arranged inside the copper tube (41).

2. A superconducting current lead component according to claim 1, characterized in that: The sealed vacuum tube (3) comprises an outer tube (32), an inner tube (31) is arranged inside the outer tube (32), a vacuum interlayer is formed between the inner tube (31) and the outer tube (32), and an air extraction valve (33) is arranged on the outer tube (32).

3. A superconducting current lead component according to claim 1, characterized in that: The connection end (1) is provided with a bolt connection hole (11) and a plurality of liquid nitrogen channels (13).

4. A superconducting current lead component according to claim 2, characterized in that: The connection assembly (2) comprises a lead-out terminal (21), on which a flange (23) is provided, and the flange (23) is fixedly connected to the lead-out terminal (21) via an insulating sleeve (22).

5. A superconducting current lead component according to claim 4, characterized in that: The lead-out terminal (21), the insulating sleeve (22) and the flange (23) are all provided with an exhaust channel (24) for passing liquid nitrogen; the exhaust channels (24) are interconnected and a first airtight valve is provided in the exhaust channel (24).

6. A superconducting current lead component according to claim 1, characterized in that: The spoiler assembly (5) comprises a plurality of spoiler plates (51), and every two adjacent spoiler plates (51) are fixedly connected via a polytetrafluoroethylene connecting column (52).

7. A superconducting current lead component according to claim 1, characterized in that: The insulating layer (6) comprises an insulating sleeve (61), and a stress cone (62) is provided on the insulating sleeve (61).

8. A superconducting current lead component according to claim 4, characterized in that: The connection terminal (1) and the lead-out terminal (21) are respectively provided with a plurality of first welding holes (12) and second welding holes (25).

9. A superconducting current lead component according to claim 4, characterized in that: One end of the outer tube (32) and the inner tube (31) are both fixedly connected to the connection end (1), and the other end are both fixedly connected to the lead-out end (21).

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