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Patent Searching and Data


Title:
CRYOGENIC REFRIGERATING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2002/029337
Kind Code:
A1
Abstract:
The present invention provides a cryogenic refrigerating system for achieving ultra low temperature by sequentially obtaining low temperature through repetition of expansion and evaporation of a mixed-refrigerant in multiple stages. The refrigerating system includes a heat exchanger and a compresor between a final evaporator and a compressor. The heat exchanger causes evaporated refrigerant vapor in a suction tube for the compressor to be heated and to be drawn into the compressor, and causes the regrigerant condensed by a condenser to be supercooled. The refrigerating system includes a plurality of expansion/suction apparatuses connected with one another between the gas/liquid separator and the final evaporator.

Inventors:
PARK HEE-JUN (KR)
Application Number:
PCT/KR2001/001667
Publication Date:
April 11, 2002
Filing Date:
October 05, 2001
Export Citation:
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Assignee:
OPERON CO LTD (KR)
PARK HEE JUN (KR)
International Classes:
F25B5/04; F25B9/00; F25B7/00; F25B41/00; (IPC1-7): F25B7/00; F25B1/00; F25B9/00
Foreign References:
US4689964A1987-09-01
JPS61598317B2
JPH08105660A1996-04-23
JPH08165465A1996-06-25
Attorney, Agent or Firm:
Cho, Tarm (12th Fl. Socho-dong Socho-gu Seoul 137-070, KR)
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Claims:
CLAIMS
1. A multistage mixedrefrigerant type cryogenic refrigerating system including a compressor 1 for compressing a mixedrefrigerant drawn thereinto, an oil separator 10 for separating oil contained in the refrigerant compressed by the compressor, a condenser 2 for liquefying refrigerant vapor discharged from the oil separator, a heat exchanger 3 for heating evaporated refrigerant vapor introduced after circulating through a low temperature side refrigeration cycle to be further evaporated and for supercooling the refrigerant condensed by the condenser 2, a first gas/liquid separator 4a for separating the supercooled mixedrefrigerant into a liquid refrigerant and a gaseous refrigerant, and a final evaporator for evaporating the refrigerant to be returned to the compressor 1, the refrigerating system further comprising: a plurality of expansion/suction apparatuses connected with one another in series, wherein each expansion/suction apparatus is constructed such that a liquid mixed refrigerant from the first gas/liquid separator 4a passes through an expansion device 8a and is then injected from an injection nozzle 7a installed on a side end of an evaporated refrigerant carrying tube 6a into an outer tube of a double tube so that the injected refrigerant is evaporated while flowing downwardly and then flows into an evaporated refrigerant carrying tube 6 on a high temperature side, and a gaseous mixedrefrigerant discharged from the first gas/liquid separator 4a flows upwardly through an inner tube for the condensed refrigerant of the double tube 5a to be condensed and is then introduced into a second gas/liquid separator 4b; and wherein the refrigerant condensed by passing through a final expansion/suction apparatus D is introduced into a fifth expansion device 8e through a heat exchanger disposed below the final evaporator, the refrigerant introduced into the evaporator 14 is evaporated, and the completely evaporated refrigerant is returned to the compressor 1 through a tube for the evaporated refrigerant communicating with the evaporated refrigerant carrying tube, whereby a refrigerant circuit of the refrigerating system is formed.
2. The cryogenic refrigerating system as claimed in claim 1, wherein four expansion/suction apparatuses are connected with one another in series between the heat exchanger on the high temperature side and the evaporator on an ultra low temperature side.
3. 5 3. The cryogenic refrigerating system as claimed in claim 1, wherein the injection nozzle is installed at a narrow end of the tube for the evaporated refrigerant communicating with the evaporated refrigerant carrying tube.