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:
May. 22, 2001
Filed:
Jul. 14, 1999
Toshio Ashida, Osaka, JP;
Shinichi Nakaishi, Osaka, JP;
Ikuji Ishii, Osaka, JP;
Nobutaka Sasaki, Osaka, JP;
Shin Furuta, Osaka, JP;
Daikin Industries, Ltd., Osaka, JP;
Abstract
In a main circuit (,) of refrigerant circuitry (,), a liquid-side shutoff valve (,) is provided between a liquid receiver (,) and an indoor heat exchanger (,). Downstream of the liquid-side shutoff valve (,), a refrigerant charging section (,A) including a refrigerant charge valve (,) connectable with a refrigerant cylinder (,) is provided. The refrigerant circuitry (,) includes a pressure relieving circuit (SVP) for conducting refrigerant in a high-pressure-side line of the refrigerant circuitry (,) to a low-pressure-side line thereof in additional refrigerant charging operation executed by operating compressors (,) with the liquid-side shutoff valve (,) closed. The refrigerant circuitry (,) further includes an injection circuit (SVT) for lowering the temperature of refrigerant discharged from the compressors (,) by supplying low-temperature refrigerant flowing downstream of an outdoor electronic expansion valve (,) to the compressors (,) when the superheating degree of the discharged refrigerant is larger than a first predetermined temperature.