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:
Oct. 29, 2013
Filed:
Oct. 30, 2008
Steven Trent Sommer, York, PA (US);
John Trevino, Jr., York, PA (US);
Florin Iancu, York, PA (US);
Rudy Chervil, Mountville, PA (US);
Eric John Smyder, York, PA (US);
Steven Trent Sommer, York, PA (US);
John Trevino, Jr., York, PA (US);
Florin Iancu, York, PA (US);
Rudy Chervil, Mountville, PA (US);
Eric John Smyder, York, PA (US);
Johnson Controls & Technology Company, Holland, MI (US);
Abstract
A system for controlling a centrifugal gas compressor () in an HVAC, refrigeration or liquid chiller system () in which flow of gas through the compressor is automatically controlled to maintain desired parameters within predetermined ranges so as to prevent stall and surge conditions within the system. A variable geometry diffuser () in the compressor controls the refrigerant gas flow at the discharge of the compressor impeller wheel (). This arrangement reduces mass flow, decrease/eliminate flow-reducing stall, and increases the operating efficiency of the compressor at partial load conditions. The variable geometry diffuser control in combination with a variable speed drive (VSD) () increases the efficiency of the compressor at partial system loads, and eliminates the need for pre-rotation vanes at the inlet of the centrifugal compressor.