WO2014156027A1 - Système de refroidissement - Google Patents

Système de refroidissement Download PDF

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Publication number
WO2014156027A1
WO2014156027A1 PCT/JP2014/001445 JP2014001445W WO2014156027A1 WO 2014156027 A1 WO2014156027 A1 WO 2014156027A1 JP 2014001445 W JP2014001445 W JP 2014001445W WO 2014156027 A1 WO2014156027 A1 WO 2014156027A1
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WO
WIPO (PCT)
Prior art keywords
linear conductor
cooling
wire
cooling system
metal
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Application number
PCT/JP2014/001445
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English (en)
Japanese (ja)
Inventor
芦田　哲哉
広 吉田
幸治 橋本
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三菱電線工業株式会社
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Publication of WO2014156027A1 publication Critical patent/WO2014156027A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/34—Cable fittings for cryogenic cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
    • H01B12/16—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by cooling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

Definitions

  • the present invention relates to a cooling system, and more particularly, to a cooling system for a low electrical resistance linear conductor used for electric wires and cables.
  • Patent Document 1 discloses a superconducting material in which silver is 1 ppm or less, sulfur is 0.5 ppm or less, the balance is substantially copper, and the residual resistance ratio is 4000 or more.
  • a copper material for (superconducting) is disclosed.
  • Patent Document 2 is made of a rolled material of high-purity aluminum having a purity of 99.9999% by mass or more, and the surface of the rolled material is subjected to surface polishing treatment, so that it has a low electrical resistivity at an extremely low temperature.
  • a high-purity aluminum material that can express the above is disclosed.
  • a superconducting cable using a superconducting material as a conductor requires a cooling system for cooling and maintaining the conductor at an extremely low temperature.
  • a large-scale device for performing phase conversion of the refrigerant such as refrigerant recovery and re-cooling is necessary, and for example, a robust structure is necessary in preparation for rapid vaporization of the refrigerant in the event of an accident. Therefore, there is a problem that if the system is constructed based on safety, the cost becomes high.
  • the present invention has been made in view of such points, and an object of the present invention is to construct a cooling system in which costs are suppressed as much as possible.
  • the present invention has a metal wire having a circular cross section and a purity of 99.999% by mass or more, and the average crystal grain size in the cross section of the metal wire is 1 of the diameter of the metal wire.
  • the linear conductor formed at / 20 or more is cooled between the first connection portion and the second connection portion.
  • the cooling system according to the present invention has a metal wire having a circular cross section and a purity of 99.999% by mass or more, and the average crystal grain size in the cross section of the metal wire is the diameter of the metal wire.
  • a first connection portion connected to one end of the linear conductor, a second connection portion connected to the other end of the linear conductor, and the first And a cooling device that is provided between the first connection portion and the second connection portion and cools the linear conductor.
  • the crystal defect in a metal wire reduces, and metal
  • the residual resistance ratio (Residual Resistivity Ratio, hereinafter also referred to as “RRR”) of the electric wire becomes higher than 500.
  • a linear conductor having a metal wire of low electrical resistance and high purity as described above has a high thermal conductivity (20 ° C.) of about 200 W / (m ⁇ K) to 420 W / (m ⁇ K).
  • the thermal conductivity is higher than that of a superconducting material such as niobium titanium. Therefore, for example, by cooling a part of the linear conductor to the cryogenic temperature, the cryogenic temperature spreads over the entire linear conductor, and the entire linear conductor is cooled to the cryogenic temperature.
  • the linear conductor constituting the cooling system is configured by using a metal wire that is relatively easy to manufacture and process without using a superconducting material such as niobium titanium, which is relatively difficult to manufacture and process. Therefore, a cooling system with a reduced cost as much as possible is constructed.
  • RRR is the ratio of electrical resistance at a temperature of 293K (normal temperature 20 ° C.) and 4.2K.
  • a plurality of the cooling devices are provided between the first connection portion and the second connection portion so as to be separated from each other along the linear conductor, and the linear conductor is interposed between the plurality of cooling devices.
  • a cold room may be provided so as to surround it.
  • the cold insulation chamber surrounding a part of the linear conductor is provided between the plurality of cooling devices spaced apart from each other, for example, the linear conductor cooled to a cryogenic temperature by each cooling device. Since the cryogenic temperature of the portion spreads through the linear conductor having a relatively high thermal conductivity to the linear conductor portion arranged inside the cold insulation chamber, the entire linear conductor is cooled to the cryogenic temperature, and the linear conductor The cooling device is more compact than the case where the entire length is cooled by the cooling device, and the running cost for cooling is suppressed.
  • the cooling device may be provided such that the linear conductor is cooled via a refrigerant, and the refrigerant from the cooling device flows into the cold insulation chamber adjacent to the cooling device.
  • the refrigerant from the cooling device flows into the cold insulation chamber adjacent to the cooling device, so that the linear conductor is cooled by using the refrigerant from the cooling device inside the cold insulation chamber.
  • the refrigerant leaking from the cooling device is effectively used.
  • One cooling device may be provided between the first connection portion and the second connection portion so as to extend over the entire length of the linear conductor.
  • the linear conductor using the superconductive material is cooled.
  • the diameter of a cable that is provided with a linear conductor therein and is configured so that the linear conductor can be cooled is reduced, and the cooling device becomes compact.
  • the cooling device may include a cooling chamber provided so as to surround the linear conductor, and a refrigerant supply unit that supplies a refrigerant to the inside of the cooling chamber.
  • the cooling device since the cooling device includes the cooling chamber provided so as to surround the linear conductor and the refrigerant supply unit that supplies the refrigerant to the inside of the cooling chamber, the refrigerant is provided on the side surface of the linear conductor. Specifically, a cooling device that cools the linear conductor by bringing them into contact with each other is configured.
  • the linear conductor may be a stranded wire having a plurality of the metal wires, and the plurality of metal wires extending in parallel with each other.
  • the linear conductor is comprised by the strand wire provided so that several metal electric wires may extend mutually in parallel, the intensity
  • the purity of the metal electric wire may be 99.9999% by mass or more.
  • the average crystal grain size in the cross section of the metal wire may be 1/10 or more of the diameter of the metal wire.
  • the average crystal grain diameter in the cross section of a metal electric wire is 1/10 or more of the diameter of a metal electric wire, the crystal defect in a metal electric wire reduces further, and RRR of a linear conductor is still higher.
  • the total content of iron and nickel in the metal wire may be 1 ppm or less.
  • the total content of iron and nickel in a metal wire is 1 ppm or less, for example, it is suitably used in a strong magnetic field having a magnetic flux density of 1 T or more, such as a magnetic resonance imaging diagnostic apparatus or a nuclear magnetic resonance diagnostic apparatus. Is done.
  • the metal wire may be covered with an insulating layer made of polyimide resin.
  • the flexibility of the insulating layer allows even in an extremely low temperature environment (for example, liquid nitrogen temperature: ⁇ 196 ° C.) Breakage due to cracking of the insulating layer covering the metal wire is suppressed. Further, when considering the materials of the metal electric wire and the insulating layer, the thermal expansion coefficient inevitably differs greatly. However, even if the metal wire expands / contracts (expands / shrinks) due to the ambient temperature of the linear conductor, the insulating layer follows the expansion / contraction of the metal wire with its flexibility, while keeping in close contact with the side surface of the metal wire. Even under harsh conditions that repeat an environment and a cryogenic environment, the deterioration of the insulating layer is suppressed.
  • an extremely low temperature environment for example, liquid nitrogen temperature: ⁇ 196 ° C.
  • the cross section is formed in a circular shape and has a metal wire having a purity of 99.999% by mass or more, and the average crystal grain size in the cross section of the metal wire is formed to be 1/20 or more of the diameter of the metal wire. Since the linear conductor is configured to be cooled between the first connection portion and the second connection portion, it is possible to construct a cooling system in which the cost is suppressed as much as possible.
  • FIG. 1 is a cross-sectional view illustrating a cooling system according to the first embodiment.
  • FIG. 2 is a perspective view of a linear conductor constituting the cooling system according to the first embodiment.
  • FIG. 3 is a first example of a schematic diagram illustrating a cross section of the linear conductor according to the first embodiment.
  • FIG. 4 is a second example of a schematic diagram illustrating a cross section of the linear conductor according to the first embodiment.
  • FIG. 5 is a flowchart illustrating the method for manufacturing the linear conductor according to the first embodiment.
  • FIG. 6 is a modification of the flowchart showing the method for manufacturing the linear conductor according to the first embodiment.
  • FIG. 7 is a perspective view of another linear conductor constituting the cooling system according to the first embodiment.
  • FIG. 8 is a flowchart showing a method for manufacturing another linear conductor according to the first embodiment.
  • FIG. 9 is a cross-sectional view illustrating the cooling system according to the second embodiment.
  • Embodiment 1 of the Invention 1 to 8 show Embodiment 1 of the cooling system according to the present invention.
  • FIG. 1 is a cross-sectional view showing the cooling system 50a of the present embodiment.
  • FIG. 2 is a perspective view of the linear conductor 20a constituting the cooling system 50a.
  • FIGS. 3 and 4 are a first example and a second example of schematic views showing a cross section of the linear conductor 20a.
  • 5 and 6 are flowcharts showing a method for manufacturing the linear conductor 20a.
  • FIG. 7 is a perspective view of the linear conductor 20b constituting the cooling system 50a.
  • FIG. 8 is a flowchart showing a method for manufacturing the linear conductor 20b.
  • the cooling system 50 a includes a linear conductor 20, a first connection portion 21 connected to one end in the length direction of the linear conductor 20, and the other in the length direction of the linear conductor 20.
  • a plurality of cold insulation chambers 40 are provided between a pair of adjacent cooling devices 30 to keep the linear conductor 20 cold.
  • a linear conductor 20a see FIG. 2 whose conductor is exposed on the side surface and a linear conductor 20b (see FIG. 7) whose conductor is not exposed on the side surface are illustrated.
  • the linear conductor 20a is a stranded wire in which a plurality of (for example, seven) metal wires 10 provided so as to extend in parallel with each other are twisted together.
  • the metal wire 10 has a circular cross section and is made of, for example, copper, aluminum, silver, or the like.
  • the purity of the metal of the metal electric wire 10 is 99.999 mass% or more, preferably 99.9999 mass% or more, more preferably 99.99999 mass% or more.
  • the average crystal grain size in the cross section of the metal wire 10 is 1/20 or more of the diameter of the metal wire 10 (for example, about 1/10, see FIG. 3). / 10 or more (for example, about 1/5, see FIG. 4).
  • the total content of iron and nickel in the metal wire 10 is 1 ppm or less.
  • the metal electric wire 10 has a high thermal conductivity of about 380 W / (m ⁇ K) in the case of copper, about 200 W / (m ⁇ K) in the case of aluminum, and about 420 W / (m ⁇ K) in the case of silver (20 ° C).
  • the thermal conductivity is measured by a laser flash method based on JIS R 1611.
  • the linear conductor 20b is a stranded wire obtained by twisting a plurality of (for example, seven) insulated wires 15 provided so as to extend in parallel to each other.
  • the insulated wire 15 includes a metal wire 10 and a polyimide resin insulating layer 11 provided so as to cover the side surface of the metal wire 10.
  • the insulating layer 11 is made of, for example, a block copolymerized polyimide.
  • the block copolymerized polyimide has, for example, a siloxane bond in the main chain of the polyimide and an anionic group in the molecule. ing.
  • the block copolymerized polyimide has, for example, a weight average molecular weight of 45,000 to 90,000 and a number average molecular weight of 20,000 to 40,000.
  • the film thickness of the insulating layer 11 is, for example, about 1 ⁇ m to 50 ⁇ m.
  • the first connection portion 21 and the second connection portion 22 are, for example, copper connection terminals, and are fixed to the linear conductor 20 by crimping or compression.
  • the cooling device 30 includes a cooling chamber 31 provided so as to surround a part of the linear conductor 20, and a refrigerant supply unit 32 connected to a side surface of a cylindrical body described later of the cooling chamber 31. It has.
  • the cooling chamber 31 includes, for example, a cylindrical body provided around the linear conductor 20, and a pair of annular bodies that are respectively provided in a pair of openings of the cylindrical body and into which the linear conductor 20 is inserted. An almost closed space is formed.
  • the cooling chamber 31 has a structure such as a double wall made of stainless steel in which a vacuum heat insulating layer is formed between the walls.
  • the refrigerant supply unit 32 is provided so as to supply, for example, a refrigerant C such as liquid helium or liquid nitrogen into the cooling chamber 31.
  • the cooling device 30 that cools the linear conductor 20 by bringing the liquid refrigerant C into contact with the linear conductor 20 is exemplified, but the cooling device that cools the linear conductor 20 includes steam, refrigerant, and the like.
  • the cold insulation chamber 40 connects a pair of adjacent cooling devices 30 and is provided in a cylindrical shape so as to surround a part of the linear conductor 20.
  • the cold insulation chamber 40 is composed of, for example, a stainless steel double tube in which a vacuum heat insulating layer is formed between the tubes.
  • the cooling system 50 a configured as described above cools the linear conductors 20 arranged inside the cooling chambers 31 of the respective cooling devices 30 with the refrigerant C, and the cooling chambers 40 adjacent to the cooling chambers 31.
  • the refrigerant C from the cooling chamber 31 flows into the interior, so that the linear conductor 20 is not only kept cool but also cooled inside the cold storage chamber 40.
  • the manufacturing method of the linear conductor 20a which comprises the cooling system 50a of this embodiment is demonstrated.
  • the manufacturing method of this embodiment includes a preparation process, a heat treatment process, and a molding process.
  • a billet having a purity of 99.999% by mass or more is produced by casting electrolytic copper, and then the produced billet is drawn in a plurality of steps. Make a copper wire of about 1mm to 3.2mm.
  • the copper electric wire in the furnace is at 300 ° C or higher for 1 hour or longer (preferably 500 ° C or higher for 1 hour or longer).
  • Heat treatment in a reducing atmosphere such as hydrogen, an inert gas atmosphere such as nitrogen, or a vacuum atmosphere under certain conditions allows the average crystal grain size in the cross section of the copper wire to be 1/20 or more, preferably 1/10 of the diameter of the copper wire. That's it.
  • the manufacturing method which performs the batch process which heat-processes a copper electric wire collectively was illustrated, for example, the copper electric wire produced at the said preparatory process is carried into a cylindrical pipe annealing furnace as it is, and By carrying the copper wire in the furnace, it is carried out in a reducing atmosphere such as hydrogen or an inert gas atmosphere such as nitrogen under conditions of 500 ° C. or higher and 30 seconds or longer (preferably 600 ° C. or higher and 30 seconds or longer). You may heat-process continuously.
  • a reducing atmosphere such as hydrogen or an inert gas atmosphere such as nitrogen under conditions of 500 ° C. or higher and 30 seconds or longer (preferably 600 ° C. or higher and 30 seconds or longer).
  • a plurality of copper wires heat-treated in the heat treatment step are prepared, and the plurality of copper wires are twisted together to produce a stranded wire (linear conductor 20a).
  • the linear conductor 20a of this embodiment can be manufactured.
  • molding process after performing a heat treatment process was illustrated, after performing the preparation process mentioned above, as shown in FIG.
  • the above-described heat treatment step may be performed.
  • the linear conductor 20b of this embodiment is the heat-treated copper electric wire, after performing the preparation process and heat treatment process which were mentioned above, as shown in FIG. 8, similarly to the manufacturing method of the line conductor 20a mentioned above.
  • the insulating layer 11 is formed by performing electrodeposition coating or dip coating on the side surface of the film and subsequent baking treatment, and finally, the molding process described above can be performed.
  • Example 1 a copper wire having a purity of 99.999 mass%, 99.9999 mass%, or 99.999998 mass% was used, and the above-described linear conductor was used.
  • a single-wire copper wire having a diameter of 0.32 mm was manufactured by performing heat treatment under predetermined conditions.
  • Comparative Examples 1 and 2 a copper wire having a purity of 99.99% by mass and 99.999% by mass was used, and a single-wire copper wire having a diameter of 0.32 mm was produced by performing heat treatment under predetermined conditions. And about each produced copper electric wire, the crystal grain size, RRR, and the total content of iron and nickel were evaluated.
  • the crystal grain size that is, the average crystal grain size was calculated based on the formula ⁇ (average crystal area / ⁇ ) ⁇ ⁇ 2 from the microstructure of the cross section of the copper electric wire.
  • the RRR, room temperature electrical resistance R 293 K at (20 °C 293K), and the electrical resistance R 4.2 K in liquid helium temperature (4.2 K) as measured by the four probe method, R 293 K / R 4.2 K of Calculated from the formula.
  • the total content of iron and nickel was measured by glow discharge mass spectrometry using VG9000 manufactured by Thermo Fisher Scientific Co., Ltd.
  • the purity of copper is also determined by glow discharge mass spectrometry. Copper content or impurities (elements such as silver, aluminum, arsenic, bismuth, chromium, iron, magnesium, sodium, nickel, sulfur, antimony, silicon) It was calculated by measuring the content of.
  • Example 1 Although 99.99 mass% copper wire was heat-treated at 500 ° C. for 1 hour (3600 seconds), the RRR was about 400, but in Examples 1 to 3, It was confirmed that the RRR was increased to about 1500 to 4600 when heat-treated at a temperature of 300 ° C. or higher for 1 hour or longer using a higher purity 99.999 mass% copper wire. Moreover, in Example 4 which performed the continuous process, it was confirmed that RRR will become high to about 2800 only by heat-processing on the conditions for 30 second at 500 degreeC. Furthermore, in Example 5 using a 99.9999 mass% copper wire, it was confirmed that the RRR increases to about 4500 just by heat treatment at 500 ° C. for 30 seconds.
  • Example 6 using a 99.99998% by mass copper wire of higher purity, it was confirmed that the RRR was increased to about 5400 just by heat treatment at 500 ° C. for 30 seconds. Similarly, in Examples 7 to 9 using 99.99998% by mass of copper wire, it was confirmed that the RRR was increased to about 4800 to 9800 by heat treatment at 300 ° C. or more for 1 hour or more.
  • the average crystal grain size is about 1/22 and 1/21 of the diameter of the copper wire in Comparative Examples 1 and 2, but in Examples 1 to 9, 1/16 to 1 of the diameter of the copper wire. It was about / 6, and it was confirmed that it became 1/20 (preferably 1/10) or more of the diameter of the copper electric wire.
  • the total content of iron and nickel is 1.1 and 0.3 ppm in Comparative Examples 1 and 2, but 0.02 to 0.5 ppm in Examples 1 to 9 and 1 ppm or less. It was confirmed.
  • Example 9 As an example, using a copper wire having a purity of 99.9999% by mass and a diameter of 1.0 mm, the heat treatment of Example 9 described above was performed, and then a polyimide resin was electrodeposited on the side surface to obtain a thickness of 10 ⁇ m. An insulated wire having an insulating layer made of a polyimide resin was prepared. In addition, as a comparative example, after performing the heat treatment of Example 9 described above using a copper wire having a purity of 99.9999% by mass and a diameter of 1.0 mm, the epoxy resin is dip-coated on the side surface to obtain a thickness. An insulated wire having an insulating layer made of epoxy resin of about 10 ⁇ m was produced.
  • Each of the manufactured insulated wires was tightly wound 10 times in a coil shape with an inner diameter of 1 mm to prepare test specimens, and each test specimen was immersed in liquid nitrogen for 10 minutes, and then returned to room temperature (20 ° C.). The surface of the insulating layer of each test specimen was observed with a 20x magnifier to check for cracks.
  • a copper wire is exemplified as the metal wire, but the present invention can also be applied to a metal wire made of aluminum or silver.
  • the average crystal grain size in the cross section of each metal wire 10 having a purity of 99.999% by mass or more is 1/20 or more of the diameter of the metal wire 10. Therefore, crystal defects in the metal wire 10 are reduced, and the RRR of the metal wire 10 is increased to 500 or more.
  • the linear conductor 20 having such a low-electric resistance and high-purity metal wire 10 has a high thermal conductivity (20 ° C.) of about 200 W / (m ⁇ K) to 420 W / (m ⁇ K). Therefore, it has a higher thermal conductivity than a superconducting material such as niobium titanium even at an extremely low temperature of about 4.2K.
  • the cooling device 30 which cools the linear conductor 20 between the 1st connection part 21 and the 2nd connection part 22 can be simplified.
  • the linear conductor 20 constituting the cooling system 50a uses, for example, the metal electric wire 10 that is relatively easy to manufacture and process without using a superconductive material such as niobium titanium that is relatively difficult to manufacture and process. Therefore, it is possible to construct the cooling system 50a with the cost reduced as much as possible.
  • the cold insulation chamber 40 that surrounds a part of the linear conductor 20 is provided between the plurality of cooling devices 30 that are separated from each other.
  • the entire conductor 20 is cooled to a very low temperature, and the cooling device 30 can be made more compact than the case where the linear conductor is cooled by the cooling device over the entire length, and the running cost related to cooling can be suppressed.
  • the refrigerant C from the cooling device 30 flows into the cold insulating chamber 40 adjacent to the cooling device 30, so that the cooling device is provided inside the cold insulating chamber 40.
  • the linear conductor 20 is cooled by using the refrigerant C from the refrigerant 30, and the refrigerant C leaked from the cooling device 30 can be used effectively.
  • the linear conductor 20 is comprised by the strand wire provided so that the several metal electric wire 10 might mutually extend in parallel, when a single wire metal electric wire is used As a result, the strength of the linear conductor 20 can be increased.
  • the magnetic flux density of 1 T or more such as a magnetic resonance imaging diagnostic apparatus or a nuclear magnetic resonance diagnostic apparatus, is used. It can be suitably used in a strong magnetic field.
  • the metal electric wire 10 constituting the linear conductor 20 is a high-purity copper electric wire
  • the conductor is not a superconducting material, and the connection technology is established. Since it is an electric wire, it can be easily connected to a peripheral device.
  • the cooling system 50a using the linear conductor 20b of this embodiment since the metal electric wire 10 is covered with the insulating layer 11 made of polyimide resin, the flexibility of the insulating layer 11 allows a cryogenic environment ( Even at a liquid nitrogen temperature of ⁇ 196 ° C., breakage due to cracking of the insulating layer 11 covering the metal wire 10 can be suppressed. In addition, when considering the materials of the metal wire 10 and the insulating layer 11, the thermal expansion coefficients are inevitably greatly different.
  • the insulating layer 11 can be expanded and contracted while being in close contact with the side surface of the metal wire 10 due to its flexibility. Since it follows, the deterioration of the insulating layer 11 can be suppressed even under harsh conditions in which the normal temperature environment and the cryogenic environment are repeated.
  • FIG. 9 is a cross-sectional view showing the cooling system 50b of the present embodiment.
  • the same portions as those in FIGS. 1 to 8 are denoted by the same reference numerals, and detailed description thereof is omitted.
  • the cooling system 50a including the plurality of cooling devices 30 is illustrated, but in the present embodiment, the cooling system 50b including one cooling device 35 is illustrated.
  • the cooling system 50 b includes a linear conductor 20 composed of the linear conductor 20 a or 20 b of the first embodiment, and a first connection portion connected to one end in the length direction of the linear conductor 20. 21, provided between the second connection part 22 connected to the other end in the length direction of the linear conductor 20, and the first connection part 21 and the second connection part 22, for cooling the linear conductor 20.
  • the cooling device 35 is provided.
  • the cooling device 35 includes a cooling chamber 33 provided so as to surround the entire linear conductor 20, and a refrigerant supply unit 34 connected to a side surface of a cylindrical body described later of the cooling chamber 33. I have.
  • the cooling chamber 33 includes, for example, a cylindrical body provided around the linear conductor 20 and a pair of annular bodies that are provided in a pair of openings of the cylindrical body and into which the linear conductor 20 is inserted, An almost closed space is formed.
  • the cooling chamber 33 has a structure such as a double wall made of stainless steel in which a vacuum heat insulating layer is formed between the walls.
  • the refrigerant supply unit 34 is provided so as to supply, for example, a refrigerant C such as liquid helium into the cooling chamber 33.
  • the cooling system 50b having the above-described configuration is configured to cool the linear conductor 20 disposed inside the cooling chamber 31 of the cooling device 35 with the refrigerant C as shown in FIG.
  • each of the metal wires 10 includes a plurality of metal wires 10 having a circular cross section and a purity of 99.999% by mass or more.
  • the linear conductor 20 formed so that the average crystal grain size in the cross section of the electric wire 10 is 1/20 or more of the diameter of the metal electric wire 10 is cooled between the first connecting portion 21 and the second connecting portion 22. Therefore, it is possible to construct the cooling system 50b whose cost is suppressed as much as possible.
  • the single cooling device 35 is provided between the first connection portion 21 and the second connection portion 22 so as to extend over the entire length of the linear conductor 20, so Rather than cooling a linear conductor using a conductive material, the diameter of the cable configured to be equipped with the linear conductor 20 and capable of cooling the linear conductor 20 is reduced, and the cooling device 35 is made compact. Can do.
  • the cooling system provided with a stranded wire conductor composed of seven single wires has been exemplified.
  • the present invention is not limited to a single wire other than seven stranded wires or one single wire.
  • the present invention can also be applied to a cooling system including a linear conductor and a cooling system provided with a plurality of linear conductors extending in parallel with each other.
  • a cooling system including a round wire conductor having a circular cross section is exemplified, but the present invention is a linear conductor formed in a circle having a flat cross section, The present invention can also be applied to a cooling system including a flat wire conductor having a rectangular cross section or a tubular conductor.
  • the present invention can construct a cooling system in which the cost is suppressed as much as possible. Therefore, the present invention is useful for a (electric power) cable that requires low electrical resistance.

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  • Containers, Films, And Cooling For Superconductive Devices (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Processing Of Terminals (AREA)
  • Gas Or Oil Filled Cable Accessories (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Abstract

Le système de refroidissement de l'invention est équipé : d'un conducteur linéaire (20) formé de sorte qu'il possède un câble métallique dont le plan transversal prend une forme arrondie et d'une pureté supérieure ou égale à 99,999% en masse, et qu'il présente un diamètre moyen de grains cristallins dans le plan transversal du câble métallique supérieur ou égal à 1/20 du diamètre du câble métallique; d'une première partie connexion (21) connectée à une extrémité du conducteur linéaire (20); d'une seconde partie connexion (22) connectée à l'autre extrémité du conducteur linéaire (20); et d'un dispositif de refroidissement (30) agencé entre la première et la seconde partie connexion (21, 22), et refroidissant l'extrémité du conducteur linéaire (20).
PCT/JP2014/001445 2013-03-27 2014-03-13 Système de refroidissement WO2014156027A1 (fr)

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JPH04259359A (ja) * 1991-02-14 1992-09-14 Dowa Mining Co Ltd 粗大結晶粒からなる高純度銅線の製造法
JP2001229750A (ja) * 2000-02-21 2001-08-24 Toshiba Corp 超電導ケーブル
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