초록 ▼

Fluid jet cutting system with nozzle assembly having a monolithic main body with a central fluid passageway with fixed diameter intermediate fluid jet passageway with orifice component at un upper end. The upper end of a modified focus tube is positioned directly below the outlet of the fluid jet pa

Fluid jet cutting system with nozzle assembly having a monolithic main body with a central fluid passageway with fixed diameter intermediate fluid jet passageway with orifice component at un upper end. The upper end of a modified focus tube is positioned directly below the outlet of the fluid jet passageway such that the enlarged opening at the upper end of the focus tube forms the mixing chamber. This avoids the high cost of mixing chamber wear inserts. The enlarged upper end opening has a diameter equal to or larger than a circumferential ring contacting the external most portion of the outlet of each of the preferably 3 or 4 abrasive ports spaced about the main body. The focus tube with mixing chamber enlargement avoids efficiency degrading abrasive contact with wall surfaces of the nozzle assembly. The abrasive ports extend from an upper, sloped surface of the main body to the abrasive ports outlet with the central axis of the abrasive ports forming an acute angle of less than 15 degrees. This angle minimization results in less efficiency degrading horizontal velocity components in the abrasive feed through the nozzle assembly, and also reduces surface wear contact in the main body since the abrasive ports dump the abrasive more along the central axis of the fluid filled fluid passageway and less into the side walls of the nozzle assembly and more into the fluid stream directly in a mixing region provided by the enlarged focus tube mixing chamber. The mixing chamber is preferably in the form of a deepened V configuration with a non-converging, uppermost section (e.g., a cylindrical section) having the largest diameter and a lower positioned converging section spaced below. The low wear features allows for the focus tube and main body to be formed of a material that is relatively less expensive than the high abrasion resistant material wear inserts.

대표청구항 ▼

[ What is claimed is:] [1.] A fluid jet cutting system, comprising;a high pressure fluid supply system which includes a fluid conduit;an abrasive feed system which includes an abrasive conduit;a nozzle head assembly having a main body and a generally centralized fluid passageway that has an inlet se

[ What is claimed is:] [1.] A fluid jet cutting system, comprising;a high pressure fluid supply system which includes a fluid conduit;an abrasive feed system which includes an abrasive conduit;a nozzle head assembly having a main body and a generally centralized fluid passageway that has an inlet section which is in fluid communication with said fluid conduit and an abrasive port passageway that is in abrasive feed communication with said abrasive conduit, and said nozzle head assembly including a jet orifice component in line in said fluid passageway, and said abrasive port passageway being less centralized than said fluid passageway and extending at an acute angle with respect to a central axis of said fluid passageway which acute angle is 5-15 degrees, and said nozzle head assembly further comprises a focus tube having an enlarged upper opening positioned within said fluid passageway downstream from said orifice jet component and such that said abrasive port has an outlet opening defined by an edge section of said main body which is at a level commensurate with said enlarged upper opening of said focus tube such that the outlet opening of said abrasive port opens directly into said enlarged opening of said focus tube, and a diameter of the enlarged opening of said focus tube is equal to or greater than that of a circumferential ring contacting an external most portion of said edge section, and wherein said focus tube has a converging conduit section downstream of said enlarged upper opening, which enlarged upper opening is not converging, and an exit conduit section extending downstream from said converging conduit section, and wherein said fluid jet cutting system is free of any wear insert within said nozzle head assembly and said abrasive port passageway extends in direct, straight line fashion from an initial inlet in said main body to said outlet opening.