Terminal for low-temperature cable
阅读：510发布：2021-07-24
专利汇可以提供Terminal for low-temperature cable专利检索，专利查询，专利分析的服务。并且A terminal for a low-temperature cable having a plurality of coaxial ducts defining annular channels through which a cryogenic fluid is passed and a cable conductor extending through the inner duct, has a generally tubular terminal conductor traversed by a coolant which is fed or received from the coolant chamber of the duct and passes through a single inlet or outlet conduit, at the terminal. The conductor traverses a low-temperature (deepcooling) zone, a cooling zone and a warm zone from the duct to the terminal end and may be connected externally of the terminal to an electrical supply source or a load.，下面是Terminal for low-temperature cable专利的具体信息内容。
1. A low-temperature system for the transmission of electrical energy comprising a cable having at least three coaxial corrugated ducts defining at least two annular compartments and a central compartment, a conductor extending throuGh said central compartment, and a layer of electrical insulation disposed between said conductor and the wall of the innermost duct, a terminal disposed at one end of said ducts and defining a deepcooling zone adjacent said ducts, a cool zone adjacent said deepcooling zone and a warm zone adjacent said cool zone, the improvement wherein said terminal comprises: respective conductor means electrically connected to said conductor and extending through said zones for transmission of electric current in series through the respective conductor means, said conductor means of said cool zone including an electrically conductive tube; A sheath of electrical insulating material surrounding said conductor means at least in said deep-cooling zone and defining an axial passage extending along said conductor means in said deep-cooling zone; and means including a conduit held at ground potential communicating with said passage for conducting a cooling medium through the innermost duct around said conductor means through said deepcooling zone and then through said electrically conductive tube.
2. The improvement defined in claim 1, further comprising means defining a common vacuum chamber extending axially along and surrounding said deep-cooling and cool zones.
3. The improvement defined in claim 2, further comprising an annular axially extending radiation shield disposed in said chamber, said cable having a coolant-cooled radiation shield connected in heat-conducting relation to the radiation shield in said chamber.
4. The improvement defined in claim 2 wherein said chamber is at least partly filled with multilayer thermal insulation.
5. The improvement defined in claim 1 wherein said tube is composed of a conductive material having a specific resistance in the region of the operating temperature T which increases approximately with Tn, wherein n is greater than 0.5.
6. The improvement defined in claim 1 wherein said conductor means in said cool zone comprises a plurality of such tubes in mutually spaced parallel relationship.
7. The improvement defined in claim 6, further comprising a common shell extending axially along and surrounding said tubes while being insulated electrically at least in part from said tubes.
8. The improvement defined in claim 6 wherein said conductor means of said warm zone comprises a thick-wall copper tube having a central channel and formed at its end turned toward said cool zone with a plurality of bores each receiving one of said tubes, said thick-wall copper tube being provided with passages connecting said bores with said channel for conducting the coolant from said tubes of said cool zone through said thick-wall copper tube.
9. The improvement defined in claim 6 wherein said tubes are mounted in a common tube sheet, said tubes being surrounded by a common shell connected at the cold end of said cool zone to said tube sheet by an elastic bellows.
10. The improvement defined in claim 6 wherein said tubes are surrounded by a common shell, the space within said shell being evacuated.
11. The improvement defined in claim 6 wherein said tubes are surrounded by a common shell defining around said tubes a compartment under constant coolant pressure.
12. The improvement defined in claim 1 wherein said sheath of electrical insulating material comprises a pressure-sustaining synthetic-resin insulator tube extending axially around said conductor means from said deep-cooling zone through said cool zone and into said warm zone.
13. The improvement defined in claim 12, further comprising a flange connection terminating said cool zone and connecting said warm zone thereto, said flange connection comprising a first annular flange connected to an outer casing enclosing said cool zone, a second flange juxtaposed with said first flange and connected to an inner shell surrounding said insulator tube and defining within said outer casing an evacuated space, a first annular seal between Said flanges for sealing said space, a second annular seal between said flanges for sealing the periphery of said insulator tube, and vent means formed between said annular space, at least one of the flanges being mounted upon said insulator tube.
14. The improvement defined in claim 13 wherein said vent means includes an annular chamber formed in one of said flanges between said seals.
15. The improvement defined in claim 12 wherein said warm zone is formed with a porcelain insulator housing surrounding the conductor means of said warm zone and defining therewith an oil-filled space, said conductor means of said warm zone being formed as a copper tube surrounded by said insulator tube and sealed thereto at the end of said insulator tube.
16. The improvement defined in claim 15 wherein said housing extends over a portion of said cool zone and is sealed to a casing thereof defining a vacuum space around said cool zone.
17. The improvement defined in claim 1, further comprising means for evacuating at least one of said annular compartments and including an elastic bellows with high thermal resistance hermetically sealing the end of at least one of the ducts defining the evacuated annular compartment.
18. The improvement defined in claim 17 wherein the ends of the two ducts defining the evacuated annular compartment are provided with mutually offset flanges and said bellows bridges said flanges.
19. The improvement defined in claim 18 wherein said flanges each have an inner portion contoured to fit complementarily to the respective corrugated duct and shrunk thereon upon the cooling of a weld seam formed between two split parts of the inner portion of each flange, each flange being welded to the duct sealingly along a side of the flange turned away from the cable.
20. The improvement defined in claim 17, further comprising triangular abutment elements disposed between flanges at different temperatures and extending generally in an axial direction, said abutment elements having curved bases lying against the relatively colder flange and points lying against the relatively warmer flange.
21. The improvement defined in claim 1 wherein said deep-cooling zone is formed with a casing defining a coolant space around said conductor means in said deep-cooling zone, and a shell coaxially surrounding said casing and defining a vacuum space therewith, and a radiation shield coaxially disposed between said casing and said shell, said casing being formed with spacers preventing relative radial or circumferential movement of said casing and said radiation shield but permitting relative axial movement thereof.
22. The improvement defined in claim 1 wherein said passage is formed with means inducing said coolant along a helical flow path upon traversal of the passage.
23. The improvement defined in claim 1 wherein at least one of the walls defining said passage is stepped.
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