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:
Apr. 09, 1991
Filed:
Dec. 19, 1989
Hazime Tanaka, Yokohama, JP;
Teiichi Okamoto, Kawasaki, JP;
Kenji Yoshiga, Funabashi, JP;
Kazuhiko Watanabe, Sagamihara, JP;
Fuji Koki Mfg. Co. Ltd., Tokyo, JP;
Abstract
In a thermostatic expansion valve having a thermo bulb, a valve opening degree is defined by the force difference between a first force at one side surface of a diaphragm and a second force at the other side surface thereof. The former force is the sum of the pressure of a refrigerant, sensed at the downstream side of a valve seat and applied on one side surface by an auxiliary pressure applying capillary tube, and the biasing force, applied on one side surface by a valve body spring. The latter force is the sum of the pressure of an actuator vapor, contained in a thermal bulb and applied on the other side surface of the diaphragm, and the pressure of the refrigerant, sensed at the upstream side of the valve seat in a refrigerant pathway of a valve housing and applied on the other side surface by way of a force transmitting member. Parameters for the former and latter forces are so selected that the latter becomes bigger than the former so that a refrigerant can be supplied at a flow rate over a predetermined value to an evaporator, even when the value of a superheat degree is lower than the value of a predetermined set static superheat degree in a case where the difference in the pressure of the refrigerant exerted on the valve body between a first pressure sensed at the upstream side of the valve seat and a second pressure sensed at the downstream side thereof is larger than a pressure difference which is used as a base for setting the static superheat of the thermostatic expansion valve.