JP2823331B2 - Liquid phase cooling device for superconducting rotating electrical machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention supplies a liquid-phase refrigerant contained in a liquid-phase refrigerant tank to the inside of a superconducting rotor of a superconducting rotary electric machine through a liquid-phase refrigerant supply system. The present invention relates to a liquid-phase cooling device for a superconducting rotating electric machine that stores and cools a superconducting field winding.

(Prior Art) Recently, a generator having a so-called superconducting rotor using a superconducting wire as a rotating field winding has been developed. In such a generator, in order to maintain the superconductivity of the rotating field winding, it must be cooled to a very low temperature of about 4K.
Therefore, liquid helium is used as a cooling medium for the rotating field winding.

FIG. 2 is a schematic configuration diagram of a conventional liquid-phase cooling device of a superconducting generator. In the drawing, 1 is a superconducting rotor of a generator, 2 is a liquid-phase refrigerant dual storing liquid-phase refrigerant, and the liquid-phase refrigerant stored in this liquid-phase refrigerant dual 2 is a liquid-phase refrigerant of a refrigerant supply / discharge device 3. It is supplied into the superconducting rotor 1 through the refrigerant supply pipe 3a and stored. The liquid-phase refrigerant stored in the superconducting rotor 1 cools the superconducting field winding and the like, and the partially vaporized refrigerant is a liquid-phase refrigerant discharge pipe of the refrigerant supply / discharge device 3.
It is discharged to the reliquefaction circuit through 3b. The reliquefaction circulation system includes a recovery gas heater 4 for recovering and heating the gas-phase refrigerant, a recovery gas compressor 5 for compressing the gas heated by the recovery gas heater 4, A recovery gas purifier 6 for purifying a gas and a liquefaction refrigerator 7 for recovering and liquefying the compressed gas purified here and returning the liquefied gas to the liquid-phase refrigerant Duer 2
Is provided.

The liquefaction refrigerator 7 is provided with an oil separator 7a made of activated carbon and an impure gas adsorber 7b on the high-temperature gas-phase refrigerant side. The accumulation of impurities in the system is prevented.

(Problems to be Solved by the Invention) In such a conventional liquid-phase cooling device of a superconducting generator, since the impurity concentration is suppressed to 0.1 ppm or less, the oil separator 7a provided in the liquefaction refrigerator is provided. And 200 to 400 kg of activated carbon is used in the impurity gas adsorber 7b.
For this reason, in addition to the increase in the size of the device and the time required for maintenance, there is a problem in that impurities are accumulated in the generator rotor which has a large resistance at the time of exhaustion and is difficult to disassemble and maintain.

The present invention has been made in view of the above circumstances,
Its purpose is to reduce the amount of activated carbon used in the liquefaction refrigeration system, reduce the size of the device, and prevent the intrusion of impurities into the rotor. To provide.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a liquid-phase refrigerant supply system for supplying a liquid-phase refrigerant contained in a liquid-phase refrigerant tank to a rotor of a superconducting rotary electric machine. The liquid-phase refrigerant tank is supplied with the liquid-phase refrigerant by cooling the superconducting field winding, storing the refrigerant, and re-liquefying the refrigerant vaporized inside the rotor in a liquefaction refrigerator system including an oil separator and an impure gas adsorber. A liquid-phase cooling device for a superconducting rotating electric machine, wherein a filter for removing impurities is provided on a low-temperature side of a liquid-phase refrigerant supply system outside the rotor.

(Operation) In the liquid-phase cooling device of the superconducting rotary electric machine having such a configuration, the impurities of the gas and the liquid are solidified at the liquid-phase refrigerant temperature, so that the impurities are removed to the liquid-phase refrigerant supply system outside the rotor. Provision of a filter for use makes it possible to easily remove impurities penetrating into the rotor and the liquefaction refrigerator system, so that the amount of activated carbon used can be reduced and the apparatus can be downsized.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the configuration of a liquid-phase cooling device for a superconducting rotary electric machine according to the present invention, and the same parts as those in FIG. In FIG. 1, reference numeral 1 denotes a superconducting rotor of a distribution machine, and 2 denotes a liquid-phase refrigerant dewar in which a liquid-phase refrigerant is stored. The liquid-phase refrigerant stored in the liquid-phase refrigerant dual 2 removes impurities in a solidified state. The liquid is supplied into the superconducting rotor 1 from the liquid-phase refrigerant supply pipe 3a of the refrigerant supply / discharge device 3 through a filter 8 for filtration, and is stored. The liquid-phase refrigerant stored in the superconducting rotor 1 cools the superconducting field winding and the like, and the partially vaporized gas-phase refrigerant passes through the liquid-phase refrigerant discharge pipe 3b of the refrigerant supply / discharge device 3 to the reliquefaction circulation system. Is discharged. The reliquefaction circulation system includes a recovery gas heater 4 for recovering and heating the gas-phase refrigerant, a recovery gas compressor 5 for compressing the gas heated by the recovery gas heater 4, A recovery gas purifier 6 for purifying the gas and a liquefaction refrigerator 7 for recovering and liquefying the compressed gas purified therefrom and returning the liquefied gas to the liquid-phase refrigerant dewar 2 are provided.

The liquefaction refrigerator 7 is provided with an oil separator 7a made of activated carbon and an impure gas adsorber 7b on the high-temperature gas-phase refrigerant side. The accumulation of impurities in the system is prevented.

Therefore, in the liquid-phase cooling device of the superconducting rotary electric machine having such a configuration, impurities entering the generator and refrigeration system due to the impure gas or the lubricating oil due to the intrusion of air from the compressor shaft seal have the liquid-phase refrigerant temperature. Since the impurities are solidified, the impurities in the solidified state are filtered by passing through a filter 8 provided between the liquid-phase refrigerant dewar 2 and the refrigerant supply / discharge device 3, and the liquid-phase refrigerant supply pipe 3 a of the refrigerant supply / discharge device 3 Are supplied to the superconducting rotor 1 and stored. Therefore, since the resistance at the time of exhausting is large and impurities do not accumulate inside the rotor, which is difficult to disassemble and maintain, the reliability of the device is improved. In the liquefaction refrigerator 7, the oil separator 7
a) Since the amount of activated carbon used in the impurity gas adsorber 7b can be reduced, the size of the apparatus can be reduced.

Note that the present invention is not limited to the above-described embodiment, and the filter 8 may be provided in the liquid-phase refrigerant supply unit inside the liquefaction refrigerator 7, or the liquid-phase refrigerant supply unit of the refrigerant supply / discharge device 3. May be provided. In the above embodiment, the liquefaction refrigerator 7 is provided with the oil separator 7a using activated carbon and the impure gas adsorber 7b. However, if necessary, the oil separator 7a using activated carbon on the high-temperature gas phase refrigerant side, A configuration without the device 7b is also possible.

[Effects of the Invention] As described above, according to the present invention, it is possible to reduce the amount of activated carbon used in a liquefaction refrigerator system, reduce the size of the device, and prevent impurities from entering the rotor. A highly reliable liquid-phase cooling device for a superconducting rotary electric machine that can be prevented can be provided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a liquid-phase cooling device for a superconducting rotary electric machine according to the present invention, and FIG. 2 is a configuration diagram of a conventional liquid-phase cooling device for a superconducting rotary electric machine. DESCRIPTION OF SYMBOLS 1 ... Superconducting rotor, 2 ... Liquid-phase refrigerant dewar, 3 ... Refrigerant supply / discharge device, 3a ... Liquid-phase refrigerant supply pipe, 3b ... Gas-phase refrigerant discharge pipe, 4 ... Recovered gas heater, 5 ... Recovered gas compressor,
6 ... recovered gas purifier, 7 ... liquefaction refrigerator, 8 ... filter.

Claims (1)

(57) [Claims] 1. A liquid-phase refrigerant stored in a liquid-phase refrigerant tank is supplied to a rotor of a superconducting rotary electric machine through a liquid-phase refrigerant supply system, stored and cooled to cool a superconducting field winding, and The liquid phase cooling device of the superconducting rotary electric machine, in which the refrigerant vaporized in is reliquefied in a liquefaction refrigerator system having an oil separator and an impure gas adsorber and circulated through the liquid phase refrigerant tank, A liquid phase cooling device for a superconducting rotating electrical machine, wherein a filter for removing impurities is provided on a low temperature side of a refrigerant supply system.