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. 09, 1997
Filed:
Apr. 30, 1996
Michael Frey, Lindau, DE;
Frank Obrist, Dornbirn, AT;
Abstract
In a vehicle air conditioning system CO.sub.2 as the refrigerant is compred by an internally controlled swash plate compressor (1) and circulates in a main circuit (2) having at least two heat exchangers (3, 5). An expansion valve (4) subdivides the main circuit (2) into a high and a low pressure part. The capacity control of the swash plate compressor (1) and therefore the air conditioning system takes place by means of a valve (23), which is located in a partial circuit (22) branched from the main circuit (2) by means of a constant choke (21) and which includes the drive chamber (18) of the swash plate compressor (1), so that in the latter it is possible to modify the pressure for adjusting the stroke length of the compressor piston (7). The branching point for the partial circuit (22) is located on an oil separator (20), which is located in the flow direction behind a first heat exchanger (5), so that the swash plate compressor (1) is cooled and is supplied with returned, cooled oil.