Refrigeration – Automatic control – Refrigeration producer
Patent
1998-01-16
2000-03-28
Wayner, William
Refrigeration
Automatic control
Refrigeration producer
62 512, 62467, F25B 3904, F25B 1902
Patent
active
060416084
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a cryogenic refrigerating apparatus, and in particular, to a cryogenic refrigerating apparatus constructed of a compressor unit provided with a compressor and a first air-cooling heat exchanger provided in communication with discharge side piping of the compressor, an intermediate unit provided with gas supply piping connected to the discharge side piping of the compressor and a second air-cooling heat exchanger which is provided in communication with the gas supply piping and cools a gas through heat exchange with air inside a room and a cryogenic expander connected to the gas supply piping, the compressor unit being able to be installed outside the room and the intermediate unit being able to be installed inside the room, whereby helium gas discharged from the compressor is cooled by the first and second air-cooling heat exchangers and supplied to the cryogenic expander.
BACKGROUND ART
Conventionally, for the purpose of preventing the occurrence of operating noises of a compressor inside a room, a compressor unit has been provided outside the room and helium gas discharged from the compressor has been air-cooled by an air-cooling heat exchanger. However, since the cooling by the air-cooling heat exchanger installed outside the room is air-cooling, the helium gas cannot be cooled to a temperature lower than the air temperature by this air-cooling heat exchanger. Therefore, when the outdoor temperature is high in summer or in a similar case, the temperature of the helium gas supplied to the cryogenic expander is hard to be maintained at a temperature not higher than a temperature (35.degree. C., for example) at which the insulating property of a motor is assured.
In view of the above, there is proposed a cryogenic refrigerating apparatus (Japanese Patent Laid-Open Publication No. HEI 6-249148) which can cool the helium gas to a lower temperature through two-stage cooling by installing a compressor unit provided with a compressor and a first air-cooling heat exchanger outside a room and installing an intermediate unit provided with a second air-cooling heat exchanger inside the room.
In this cryogenic refrigerating apparatus which performs the two-stage cooling, as shown in FIG. 7, a compressor unit 1 is constructed of a helium gas compressor 11, a first air-cooling heat exchanger 12 comprised of, for example, a cross fin coil provided in communication with discharge side piping 21 of this compressor 11 and an oil separator 13 provided in communication with the discharge side piping 21 on the outlet side of this first air-cooling heat exchanger 12, while an intermediate unit 3 provided with a second air-cooling heat exchanger 31 comprised of, for example, a cross fin coil is provided separately from this compressor unit 1, the compressor unit 1 being installed outside a room and the intermediate unit 3 being installed inside the room.
An end portion which belongs to the discharge side piping 21 connected to the discharge side of the compressor 11 is connected to gas supply piping 41 of the intermediate unit 3, while an end portion which belongs to an intake side piping 22 connected to the intake side of the compressor 11 is connected to gas return piping 42 of the intermediate unit 3.
The gas supply piping 41 of the intermediate unit 3 is connected to a high-pressure side communication piping 51 communicated with a cryogenic expander 5, while the gas return piping 42 of the intermediate unit 3 is connected to a low-pressure side communication piping 52 communicated with the cryogenic expander 5.
Further, the second air-cooling heat exchanger 31 is connected to the gas supply piping 41, an adsorber 32 is provided in communication with the outlet side of the second air-cooling heat exchanger 31 and the second air-cooling heat exchanger 31 is provided with a fan 33.
It is to be noted that oil collected in a bottom portion of the oil separator 13 is injected into a compression element of the compressor 11 via oil injection piping 23 and oil collected to a hei
REFERENCES:
patent: 3967172 (1976-06-01), Denny
patent: 4967572 (1990-11-01), Strasser
patent: 5749243 (1998-05-01), Lester
Daikin Industriesm Ltd.
Wayner William
LandOfFree
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