Cooling System for Superconducting Power Apparatus

a superconducting power and cooling system technology, applied in the field of cooling systems, can solve the problems of air bubble generation, inability to maintain the state where the gas is dissolved in the liquefied gas, etc., and achieve the effect of excellent insulation characteristics and smooth circulation

Inactive Publication Date: 2008-08-28
FURUKAWA ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0037]According to the present invention, a reservoir tank is pressurized by the same type of a gas as a liquefied gas, air bubbles are not mixed in a liquid nitrogen.
[0038]And a cooling system for a superconducting power apparatus in which the liquid nitrogen is smoothly circulated and is excellent in an insulation characteristic, can be provided.
[0039]Moreover, according to the present invention, since a liquid level of a reservoir tank reserving a liquefied gas in a pressurized state is located above an outlet of a return piping of a circulating liquefied gas at least by a dissolving depth of pressurizing gas+(plus) a liquid-level movement correction amount, the gas used for the pressurizing the reservoir tank is not liquefied.
[0040]And the cooling system for the superconducting power apparatus without dropping a pressurized pressure can be provided.

Problems solved by technology

The amount dissolved into the liquid nitrogen is extremely slight but if the liquefied gas in which He gas is dissolved is circulated, the state where He gas is dissolved in the liquefied gas can't be maintained and it generates air bubbles.

Method used

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  • Cooling System for Superconducting Power Apparatus
  • Cooling System for Superconducting Power Apparatus
  • Cooling System for Superconducting Power Apparatus

Examples

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embodiments

Embodiment 1

[0112]FIG. 2 is a view showing an embodiment of a cooling system for a superconducting power apparatus of the present invention.

[0113]Liquid nitrogen is used as a liquefied gas. The liquid nitrogen is reserved in a reservoir tank 1.

[0114]The reservoir tank 1 is in a double-container structure, in which an insulating material is constructed between a double-container surrounding an inner container 1b and maintained in a vacuum state so as to reduce a heat intrusion. Moreover, the reservoir tank is a sealed container so that an inside of the reservoir tank can be pressurized.

[0115]At a bottom of the reservoir tank, an outlet 3 of liquid from the reservoir tank connected to a circulating pump is provided, leading to an inlet of the circulating pump 5 by a piping 4 with a diameter of 3 cm.

[0116]The circulating pump 5 is a swirl rotary pump. A motor 5a for rotating a fin 5c and the fin are connected to each other by an extended shaft 5b of about 50 cm so as to restrict an inf...

embodiment 2

[0139]In the embodiment 1, a case where a circulating pump is located outside a reservoir tank is described, but the present invention can be also applied to a case where the circulating pump is located inside the reservoir tank.

[0140]FIG. 3 shows a view of a part of another mode of a cooling system for a superconducting power apparatus of the present invention. That is, FIG. 3 shows an extraction view of a reservoir tank portion of the cooling system to explain this embodiment.

[0141]In a circulating pump 5, a fin portion 5c for feeding liquid nitrogen is provided in a liquid of a reservoir tank, and a rotation of a motor 5a is transmitted by an extended shaft 5b.

[0142]The liquid nitrogen is pumped out from the reservoir tank, passes through a piping 6, goes out of the reservoir tank and is connected to a refrigerating machine for cooling the liquid nitrogen.

[0143]In this case, a piping for pressurization is mounted at a portion of the piping 6, coming out of the reservoir tank, an...

embodiment 3

[0144]In the embodiment 1, a pressurizing means for the reservoir tank is only by a gas from a circulating pump outlet. In this case, since the piping is as thin as 6 mm and has only a discharge pressure of the circulating pump, the gas supply is small and it takes an extremely long time to reach a predetermined pressure in the reservoir tank.

[0145]Particularly, if the reservoir tank is large, it takes several tens of hours. Then, as shown in FIG. 4, an external piping 21 is mounted to the reservoir tank as auxiliary means for supplying gas from a high-pressure nitrogen cylinder 22 or nitrogen curdle.

[0146]Moreover, since liquefaction is promoted when a gas phase portion inside the reservoir tank is cooled to a low temperature, a heater 23 may be arranged in a gas phase portion to restrain from the liquefaction.

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Abstract

A cooling system for a superconducting power apparatus including a reservoir tank for reserving a liquefied gas, a circulating pump, a heat exchanger for cooling the liquefied gas, and a circulation loop through which the liquefied gas is circulated, the superconducting power apparatus being cooled by circulating the liquefied gas in a subcooled state using the circulating pump. The cooling system further includes a pressurizing mechanism for pressurizing the liquefied gas in the reservoir tank with the same type of gas as the liquefied gas, wherein a liquid level in the reservoir tank for reserving the liquefied gas in a pressurized state is located above an outlet of a return piping of a circulating liquefied gas at least by a dissolving depth of the pressurizing gas+(plus) a liquid level movement correction amount.

Description

FIELD OF THE INVENTION [0001]The present invention relates to a cooling system for cooling a superconducting cable, a superconducting bus line, SMES, a superconducting transducer, etc. which can be used in an industry in a superconducting state by cooling with a liquefied gas such as a liquid nitrogen or the like and particularly to a cooling system for the cooling a superconducting power apparatus driven in a high voltage state.BACKGROUND OF THE INVENTION [0002]As one of the superconducting power apparatuses, a prior art will be described referring to FIG. 6 using a superconducting cable as an example, which uses a liquefied gas such as a liquid nitrogen for cooling. A cooling system for a superconducting cable described in Japanese patent Laid-Open No. 08-148044 is known.[0003]As shown in FIG. 6, in a conventional cooling system, a circulation cycle is repeated that a liquefied gas in a subcooled state (a state where the liquefied gas is cooled at a temperature lower than a satura...

Claims

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Application Information

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IPC IPC(8): F25B19/00
CPCF17C2270/0527F25B9/14H01F6/04F25D19/00F25B2700/04H01B12/16F25B9/00F25D3/10
InventorMUKOYAMA, SHINICHIISHII, NOBORUYAGI, MASASHIMARUYAMA, SATORUOKAMOTO, TATSUKISUZUKIICHIKAWA, MICHIHARUTAKAHASHI, TOSHIHIROAKITA, SHIRABE
OwnerFURUKAWA ELECTRIC CO LTD