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:
Feb. 10, 2004
Filed:
Feb. 05, 2002
Umang Anand, Baltimore, MD (US);
Joseph Katz, Baltimore, MD (US);
The Johns Hopkins University, Baltimore, MD (US);
Abstract
A nozzle apparatus for use with an abrasive fluid jet cutting system, and its method of construction and operation, are disclosed that reduce the wear and erosion problems typically experienced in the cutting jet's nozzle. This improved nozzle apparatus comprises (a) a nozzle having an entry port for receiving a slurry consisting of a carrier fluid and abrasive particles, an inner wall for directing the flow of the slurry, and an outlet port through which the slurry exits the nozzle, (b) wherein at least a portion of the nozzle wall is porous, and (c) a lubricating fluid chamber that surrounds the porous portion of the outer wall of the nozzle, the chamber having a port where a lubricating fluid enters the chamber, with the chamber port connecting to an input pipe which connects to a filter for filtering contaminants that might clog the pores of the porous portion of the nozzle. The nozzle operates by having the lubricating fluid pass from the lubricating reservoir and through the porous wall to lubricate at least a portion of the surface of the nozzle inner wall so as to resist erosion of the wall, as well as result in an abrasive slurry jet with improved coherence and cutting efficiency.