Porous, lubricated nozzle for abrasive fluid suspension jet

B - Operations – Transporting – 24 – C

Patent

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Details

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

Patent

CA 2475227

A nozzle apparatus for use with an abrasive fluid jet cutting system (1), and its method of construction and operation, are disclosed that reduce the wear and erosion problems typically experienced in the cutting jet~s nozzle (16). This improved nozzle apparatus comprises (a) a nozzle (16) 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 (14) 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 (12) 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.

L'invention concerne un appareil de type buse que l'on utilise avec un système de coupe à jet de fluide abrasif (1) et son procédé de fabrication et de fonctionnement permettant de réduire les problèmes d'usure et d'érosion typiques de la buse (16) à jet de coupe. Cet appareil de type buse amélioré comprend (a) une buse (16) ayant un orifice d'entrée permettant de recevoir une suspension aqueuse constituée d'un fluide de support et de particules abrasives, une paroi interne permettant de diriger l'écoulement de la suspension aqueuse et un orifice de sortie à travers lequel la suspension aqueuse sort de la buse, (b) une paroi de buse étant au moins partiellement poreuse et (c) une chambre de fluide lubrifiant (14) entourant la partie poreuse de la paroi externe de la buse, la chambre étant un orifice dans lequel entre un fluide lubrifiant, l'orifice étant relié à un tuyau d'entrée qui est, à son tour, relié à un filtre (12) permettant de filtrer les contaminants susceptibles de boucher les pores de la partie poreuse de la buse. Le fonctionnement de la buse s'effectue comme suit: un fluide lubrifiant part du réservoir lubrifiant et traverse la paroi poreuse afin de lubrifier au moins partiellement la surface de la paroi interne de la buse de manière à résister à l'érosion de la paroi et donner un jet de suspension aqueuse abrasive faisant preuve d'une efficacité améliorée en termes de cohérence et de coupe.

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