Porous, lubricated mixing tube for abrasive, fluid jet

Details Porous, lubricated mixing tube for abrasive, fluid jet Porous, lubricated mixing tube for abrasive, fluid jet

B - Operations, Transporting

24

C

B24C 5/04 (2006.01) B24C 1/04 (2006.01)

Patent

CA 2469860

An abrasive, fluid jet cutting apparatus, and its method of construction and operation, are disclosed that reduce the wear and erosion problems typically experienced in the cutting jet's mixing tube. This improved fluid jet cutting apparatus comprises (a) a chamber (10) having an inlet (12) for receiving a pressurized fluid jet, a port (14) for receiving a flow of abrasive particles which are entrained into the fluid jet, and an exit (16) through which the fluid jet and entrained abrasives exit the chamber (10), (b) a mixing tube (20) having an entry port (18) for receiving said fluid jet and entrained abrasives, an inner wall (22) for directing the flow of said fluid jet and entrained abrasives, and an outlet port (24) through which said fluid jet and entrained abrasives exit said tube, wherein the tube entry port (18) is proximate the chamber exit (16), (c) a lubricating fluid reservoir (28) that surrounds at least a portion of the outer wall (26) of the mixing tube, (d) wherein at least a portion of the mixing tube wall is porous, and (e) wherein the lubricating fluid passes from the lubricating reservoir (28) and through the porous wall to lubricate at least a portion of the surface of the mixing tube wall so as to resist erosion of the tube wall when the fluid jet and entrained abrasives flow through the mixing tube (20).

L'invention concerne un dispositif de découpage à jet de liquide abrasif, y compris son procédé de réalisation et d'utilisation, permettant de réduire les difficultés d'usure et d'érosion généralement rencontrées dans un tube mélangeur de jet liquide. Ce dispositif amélioré comprend: (a) une chambre (10) à entrée (12) pour la réception d'un liquide sous pression, un orifice (14) pour la réception de flux de particules abrasives entraînées dans le jet, et une sortie (16) évacuant le jet et ses particules entraînées hors de la chambre (10) dans un flux composite; (b) un tube mélangeur (20) à entrée (18) pour la réception du jet et de ses particules en flux composite, une paroi interne (22) dirigeant le flux composite considéré, et une sortie (24) évacuant ce flux hors du tube (ladite entrée (18) est proche de la sortie (16) de la chambre); (c) un réservoir de lubrifiant (28) entourant au moins une partie de la paroi externe (26) du tube; (d) au moins une partie du tube est poreuse; et (e) le lubrifiant sort du réservoir (28) pour passer à travers la paroi poreuse et lubrifier au moins une partie de la surface du tube, ce qui permet de résister à l'érosion de la paroi de ce tube lorsque le flux composite s'écoule à travers le tube (20).

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