The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 25, 1990
Filed:
Mar. 10, 1989
Hazime Tanaka, Yokohama, JP;
Fuji Koki Mfg. Co. Ltd., Tokyo, JP;
Abstract
In a control method for a refrigeration system having a compressor, a condenser, a thermostatic expansion valve, and an evaporator, the amount of a refrigerant flowing into the evaporator is increased at a temperature lower than a predetermined evaporating temperature by a thermostatic expansion valve which opens even if the evaporating temperature is lower than the predetermined level and a superheat signal is lower than 0. In a thermostatic expansion valve best suited for the above method, either a gas adsorbent and at least two working fluids, different in a temperature-induced change of the amount of adsorption to the gas adsorbent, or a first working fluid, whose saturated vapor pressure is lower than the superheated vapor pressure of the refrigerant at the outlet of the evaporator, and a second working fluid incapable of being liquefied within the range of the evaporating temperature of the refrigerant, are sealed in the thermotube. The pressure of the working fluids in the thermo-tube becomes greater than a resultant force to be resisted, thereby moving a valve body to an open position, when the evaporating temperature of the refrigeration system is lower than a predetermined value and also when a difference between the superheated vapor temperature detected by the thermo-tube and the evaporating temperature of the refrigerant, that is a superheat, becomes lower than 0 degrees K.