Refrigeration – Automatic control – Diverse – cascade or compound refrigeration-producing system
Patent
1996-11-04
1998-04-21
Tapolcai, William E.
Refrigeration
Automatic control
Diverse, cascade or compound refrigeration-producing system
62119, 62335, F25B 700
Patent
active
057406790
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a binary refrigerating apparatus.
BACKGROUND ART
A binary refrigerating apparatus is a combination of two types of refrigerating machines which carry out a lower temperature cycle and a higher temperature cycle respectively and is used for reaching a low temperature of minus several ten degrees. Since such an apparatus is highly efficient from a large compression ratio to a small compression ratio, it has an advantage of excellent energy conservation. An example of such apparatus is disclosed in Japanese Patent Application Laid-Open Gazette No. 5-5567. In this binary refrigerating apparatus, a refrigerating unit for a lower temperature side, which requires high-precision techniques for assembly and pipe connection and strict quality control, is factory-assembled so as to be formed into single-piece construction. The refrigerating unit is combined with a separate-type outdoor unit as a higher temperature side unit which has a simple structure. This results in easy on-site installation and enhanced reliability of the apparatus.
Even though the above binary refrigerating apparatus can save energy, it cannot effectively use its high compression ratio when an open-air temperature is low. In this case, it is necessary to continuously operate the outdoor unit. Thereby, the apparatus may have a disadvantage in energy conservation.
SUMMARY OF THE INVENTION
An object of the present invention is to attain enhanced energy conservation in a binary refrigerating apparatus.
Inventors have conducted various experiments and investigations on the above problem and found that at the time of a low open-air temperature, even if refrigerant in a higher temperature side unit is only naturally circulated without being compressed, this sufficiently makes it possible to absorb exhaust heat from a lower temperature side unit and discharge it outside the room. Thus, Inventors have completed the present invention.
The present invention includes a binary refrigerating apparatus comprising a lower temperature side unit (1) in which a lower temperature side compressor (3), a condensation part of a cascade condenser (4), expansion means (5) and an evaporator (6) are sequentially connected thereby forming a lower temperature refrigeration cycle. The binary refrigerating apparatus also comprises a higher temperature side unit (2) which has a higher temperature side compressor (15) and a condenser (16) for condensing refrigerant by using the air and which is connected to an evaporation part of the cascade condenser (4) through expansion means (9) so that the higher temperature side compressor (15) and the condenser (16) form a higher temperature refrigeration cycle.
Further, the higher temperature side unit (2) is disposed at a position higher than a position where the lower temperature side unit (1) is disposed. In addition, the binary refrigerating apparatus further comprises an open-air thermometric sensor (21) for sensing an open-air temperature, and natural circulation means for naturally circulating refrigerant in the higher temperature refrigeration cycle when an open-air temperature sensed by the open-air thermometric sensor (21) is below a specific temperature.
The natural circulation means includes a bypass passage (19) which allows refrigerant to bypass the higher temperature side compressor (15), a shut-off valve (20) for opening and closing the bypass passage (19), and control means (22) for deactivating the higher temperature side compressor (15) while opening the shut-off valve (20) when an open-air temperature sensed by the open-air thermometric sensor (21) is below the specific temperature.
The natural circulation means also includes a bypass passage (10) which allows refrigerant to bypass the expansion means (9) in the higher temperature refrigeration cycle, a shut-off valve (11) for opening and closing the bypass passage (10), and control means (22) for deactivating the higher temperature side compressor (15) while opening the shut-off valve (11) when an open-air temperature
REFERENCES:
patent: 2586454 (1952-02-01), Brandin
patent: 3392541 (1968-07-01), Nussbaum
patent: 3733845 (1973-05-01), Lieberman
patent: 4402189 (1983-09-01), Schaeffer
patent: 4567733 (1986-02-01), Mecozzi
Fujimoto Yuji
Ueno Akitoshi
Brackett Jr. Tim L.
Daikin Industries Ltd.
Ferguson Jr. Gerald J.
Tapolcai William E.
LandOfFree
Binary refrigerating apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Binary refrigerating apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Binary refrigerating apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2050232