Refrigeration – Automatic control – Refrigeration producer
Reexamination Certificate
1998-09-16
2001-12-18
McDermott, Corrine (Department: 3744)
Refrigeration
Automatic control
Refrigeration producer
C062S197000, C062S198000, C062S199000, C062S117000, C062S505000
Reexamination Certificate
active
06330805
ABSTRACT:
FIELD OF INVENTION
The present invention relates to a refrigeration unit for variable operating conditions, more particularly an air conditioning unit or refrigeration assembly operating under highly variable outside temperatures and highly variable refrigerating powers.
BACKGROUND ART
Air conditioning and refrigeration assemblies generally include a compressor having alternating ON/OF sequences for regulating the required refrigerating power. The pressure of liquid refrigerant circulating through the unit or assembly is reduced either by
(1) a capillary means in the most conventional type of equipment, or
(2) thermostatic pressure reducers in more advanced equipment being presently used.
Both solutions entail regulating the condensation temperature and keeping a supply of liquid in a tank upstream of the pressure reducer.
Moreover, the pressure reducers are either:
(1) fragile mechanical devices; for example, a thermostatic pressure reducing valve, frequently referred to as an expansion valve, or
(2) costly electronic pressure reducers.
SUMMARY OF THE INVENTION
One feature of the unit of the invention is to increase the reliability of an air conditioning unit or refrigeration assembly pressure reducer by employing two pressure reducers, such as capillaries, instead of only one capillary as is conventional. Adding a second pressure reducer eliminates the need for having a liquid tank for storing a volume of refrigerant upstream of the pressure reducer. The second capillary enables matching of outside temperatures and variable refrigeration loads.
The invention decreases the need for refrigerant-fluid charging and almost entirely eliminates the danger of liquid impacts on the service life of the equipment.
Another advantage of the invention is that the added part is wholly static to provide a substantial increase in the refrigeration assembly reliability.
The refrigeration unit of the present invention, which can operate under various conditions, comprises at least one evaporator, a compressor, a primary pressure reducer and a condenser, in one main refrigerant-fluid circuit, in combination with a secondary pressure reducer. The primary pressure reducer feeds an evaporator under normal operating conditions while the secondary pressure reducer shunts some saturated high pressure gases flowing from the condenser to the compressor and around the evaporator when the actual operating conditions are abnormal, such that the refrigerant flowing from the evaporator has a higher pressure than normal.
The above and still further objects, features and advantages of the present invention will become apparent upon consideration of the following detailed description of one specific embodiment thereof, especially when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 2958209 (1960-11-01), Egon
patent: 3014352 (1961-12-01), Leimbach
patent: 3243970 (1966-04-01), Lippincott
patent: 3261175 (1966-07-01), Fullerton
patent: 3369374 (1968-02-01), Miller
patent: 3371500 (1968-03-01), Marcus, Jr.
patent: 3396550 (1968-08-01), Cawley
patent: 3491546 (1970-01-01), Holzer
patent: 3498074 (1970-03-01), Fineblum
patent: 3564865 (1971-02-01), Spencer et al.
patent: 3631684 (1972-01-01), Randall
patent: 3851494 (1974-12-01), Hess
patent: 4258553 (1981-03-01), Kelly et al.
patent: 4550574 (1985-11-01), Hohman
patent: 4551983 (1985-11-01), Atsumi et al.
patent: 4633674 (1987-01-01), Sato
patent: 4911230 (1990-03-01), Mayer et al.
patent: 4959971 (1990-10-01), Minari
patent: 4986084 (1991-01-01), Beckhusen
patent: 5243827 (1993-09-01), Hagita et al.
patent: 5367883 (1994-11-01), Sakakibara et al.
patent: 5640854 (1997-06-01), Fogt et al.
patent: 0344397 (1989-12-01), None
patent: 0348333 (1989-12-01), None
patent: 1543666 (1967-10-01), None
patent: 2195779 (1974-08-01), None
patent: 2448115 A (1980-01-01), None
patent: 999651 (1965-07-01), None
patent: 1194006 (1970-06-01), None
patent: 2042150A (1980-09-01), None
patent: 1595616 (1981-08-01), None
patent: 2114724A (1983-08-01), None
patent: 2212942A (1984-01-01), None
patent: 2130747A (1984-06-01), None
patent: 2133521A (1984-07-01), None
patent: 2254135A (1992-09-01), None
Lowe Hauptman & Gilman & Berner LLP
McDermott Corrine
Norman Mark
LandOfFree
Method of operating a refrigerating unit with a refrigerant... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of operating a refrigerating unit with a refrigerant..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of operating a refrigerating unit with a refrigerant... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2580711