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:
Nov. 20, 2001
Filed:
Oct. 05, 1998
William Leslie Kopko, Springfield, VA (US);
WorkSmart Energy Enterprises, Inc., Washington, DC (US);
Abstract
A reciprocating compressor that includes an auxiliary port,in series with a check valve,to move fluid at an intermediate pressure that is between the main suction and discharge pressures. Piston,normally covers the auxiliary port during a portion of its stroke. In one embodiment the check valve,is oriented so that fluid flows into the compressor. The piston,uncovers the auxiliary port,during the early part of the down stroke to allow fluid in through the port. As the piston,continues to move down it covers the auxiliary port, which drops pressure in chamber,to allow fluid to enter through a main suction valve,. In other embodiments the orientation of the check valve is reversed and auxiliary port acts as an auxiliary discharge port. Multiple auxiliary ports may be used in a single cylinder to achieve multiple suction and/or discharge pressures. The preferred driving mechanism for the piston is a linear motor,or other variable-stroke device, which can control the portion of flow through the auxiliary port by adjusting piston position.