Constant temperature maintaining refrigeration system using proportional flow throttling valve and controlled bypass loop
Patent 4742689 Issued on May 10, 1988. Estimated Expiration Date: 
March 18, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 18, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2461760 3201950 3313121 3324674 3477240 3577743 3803864 Method and apparatus for preventing overheating of the superheated vapors in a solar heating system using a refrigerant High pressure charge storage system Vapor compression refrigeration system and a method of operation therefor InventorAssigneeApplicationNo. 06/840847 filed on 03/18/1986US Classes:62/197, Of expansion zone62/196.4, Condensor bypass62/205, Plural variable restrictors in flow line62/223, By external condition62/224By condition at low sideExaminersPrimary: Tanner, Harry B.Attorney, Agent or FirmInternational ClassesF25B 40/00 (20060101)F25B 41/04 (20060101) AbstractA vapor-compression refrigeration system has a continuously operating compressor, with loading on the compressor varied in accordance with conditions and cooling needs. The system avoids any on/off cycling of the compressor or valves in the system, but instead keeps cooling and bypass valves open to varying and proportional degrees depending upon requirements. The system includes several bypass loops, for bypassing coolant fluid to a proportional degree when a desired temperature is approached in a body to be cooled; and when temperature of return gas to the compressor approaches a limit temperature beyond which the compressor should not operate. In the latter case, cool liquid is injected, while expanding and vaporizing, into the hot gas for cooling, to protect the compressor. The system operates in a very hot environment to effect the maximum cooling possible without exceeding the limits of the compressor, by reducing the refrigerant flow to the evaporator to continue operating at reduced load, reducing more and more of the cooling flow as the desired set point temperature is approached and controlling bypass flow to maintain evaporator pressure or temperature. Proportional flow valves used in the system enjoy long life due to the absence of stressful on/off cycling.Other References
Field of SearchOf expansion zoneTransferring heat between diverse function portions of refrigeration cycle Heat exchange between diverse function elements Of expansion valve or variable restrictor By external condition By condition at low side At or beyond evaporator outlet, i.e., superheat Condensor bypass Plural variable restrictors in flow line High and low side | |
