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Cooling system for superconducting power apparatus

A technology for power equipment and cooling systems, applied in superconducting devices, coolers, household refrigeration devices, etc., can solve problems such as the inability to circulate liquid nitrogen smoothly and the deterioration of insulation properties.

Active Publication Date: 2007-05-23
FURUKAWA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From this, it became clear that the problem that He gas becomes bubbles in the portion where the pressure of the liquefied gas drops rapidly and is mixed into the liquid nitrogen to form a gas-liquid mixed state makes it impossible to smoothly circulate the liquid nitrogen and deteriorates the insulating properties. deterioration

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

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] FIG. 2 is a diagram illustrating an embodiment of a cooling system for a superconducting power device of the present invention. Liquid nitrogen was used as the liquefied gas. Liquid nitrogen is stored in storage tank 1. The storage tank 1 has a double-layer container structure, and a heat insulating material is constructed between the double-layer containers to surround the inner container 1b, and is maintained in a vacuum state to reduce heat conduction. Also, storage tanks are airtight containers used to pressurize the interior.

[0048] A liquid intake port 3 connected to a circulation pump was provided at the bottom of the storage tank, and from there, a pipe 4 with a diameter of 3 cm was connected to an inlet of a circulation pump 5 . The circulation pump 5 is a vortex type rotary pump. The motor 5a for rotating the heat sink 5c and the heat sink are connected by a shaft 5b having a long axis of about 50 cm in order to suppress the inflow of heat due to conducti...

Embodiment 2

[0059] In Embodiment 1, the case where the circulation pump is located outside the storage tank has been described, but the present invention can also be implemented when the circulation pump is located inside the storage tank. Fig. 3 is a partial view showing another mode of the cooling system of the superconducting power device of the present invention. That is, FIG. 3 is a diagram showing a storage tank part in the extraction cooling system of the present embodiment for explanation. The cooling fin part 5c which sends out the liquid in the circulation pump 5 is located in the liquid in the storage tank, and the rotation of the motor 5a is transmitted by the long shaft 5b. Liquid nitrogen is drawn from the storage tank and leaves the storage tank through piping 6, which is connected to a freezer which cools the liquid nitrogen.

[0060] In this case, the piping for pressurization is attached to the portion of the piping 6 away from the storage tank, and then returns to the ...

Embodiment 3

[0062] In Embodiment 1, as the pressurization mechanism of the storage tank, only the mechanism based on the gas from the outlet of the pump is used. In this case, since the pipe is as thin as 6mm, the pressure is only part of the discharge pressure, so the gas supply is also reduced, and it takes a very long time to reach the specified pressure. In particular, when the storage tank is enlarged, tens of hours are required. Therefore, as shown in FIG. 4 , an external pipe 21 is attached to the storage tank as an auxiliary mechanism, and gas is supplied from a high-pressure nitrogen cylinder 22 or a nitrogen curdle. In addition, if the gas phase part inside the storage tank is cooled to a low temperature, liquefaction will be accelerated, so the heating rod 23 may be arranged in the gas phase part to suppress liquefaction.

[0063] According to the present invention, gas having a boiling point lower than that of the liquefied gas used for pressurization can be dissolved in the ...

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Abstract

A cooling system for a superconducting power apparatus, having a reservoir for storing liquid gas, a circulation pump, a heat exchanger for cooling the liquid gas, and a circulation loop in which a liquefied gas circulates, the liquefied gas being circulated in a subcooled state by using the circulation pump to cool the superconducting power apparatus, wherein the cooling system further has pressurizing means for pressurizing the reservoir by the same kind of gas as the liquefied gas, and the liquid level of the reservoir for storing the liquefied gas in a pressurized state is positioned above the exit of a return line of the circulating liquefied gas by at least an amount equal to the sum of the depth of dissolution of the pressurizing gas and of the amount of correction of liquid level movement.

Description

technical field [0001] The invention relates to a cooling system for cooling superconducting cables, superconducting bus lines, SMES, superconducting transformers, etc., which can be industrially utilized in a superconducting state by cooling with liquefied nitrogen such as liquid nitrogen, especially relates to a cooling system for cooling in a high-voltage state The superconducting power device that operates the device. Background technique [0002] As one type of superconducting power device, a superconducting cable using nitrogen gas such as liquid nitrogen for cooling is taken as an example, and the prior art will be described with reference to FIG. 6 . As a cooling system for a superconducting cable, a structure described in JP-A-08-148044 is known. As shown in Figure 6, the existing cooling system is a system that repeats the following cycle: the liquefied gas in the supercooled state (the state in which the liquefied gas is cooled to a state lower than the saturatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25D3/10F25B9/00H01B12/16H01L39/04
CPCF25D19/00F17C2270/0527F25B9/14F25B2700/04H01F6/04H01B12/16F25B9/00F25D3/10
Inventor 向山晋一石井登八木正史丸山悟冈本达希铃木宽市川路晴高桥俊裕秋田调
Owner FURUKAWA ELECTRIC CO LTD