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. 28, 1999
Filed:
Jun. 20, 1998
Lewis Tyree, Jr, Lexington, VA (US);
Other;
Abstract
A reciprocating cryogenic pump, suitable for medium and high pressures having very low net positive suction head (NPSH) requirements. The pump comprises a cylinder having both liquid inlets and vapor outlets, and two interacting pistons, each piston reciprocably movable within the cylinder, and each piston having flow conduits there through generally co-axial with the piston and with the cylinder. The conduit of one piston preferentially connects to the liquid inlets and the conduit of the other piston preferentially connects to the vapor outlets, which are at a higher elevation than the liquid inlets. Both conduits are selectively and mechanically opened to the pumping chamber by the reciprocating motion, and the pump is oriented to allow liquid flowing into the pumping chamber by the natural tendency of liquid to flow downwards and residual vapor to leave the pumping chamber by the natural tendency of vapor to flow upwards, an act that in encouraged by the conduit connecting to the vapor outlets being opened before the conduit connecting to the liquid inlets. One use of this pump is for any on-board, mobile (truck, rail or ship), LNG fuel systems for Diesel engines.