Sub-assembly for dust suppression in rock drilling

Details Sub-assembly for dust suppression in rock drilling Sub-assembly for dust suppression in rock drilling

E - Fixed Constructions

21

B

E21B 21/14 (2006.01) B01D 19/00 (2006.01) E21B 17/22 (2006.01) E21B 21/00 (2006.01) E21C 7/08 (1995.01)

Patent

CA 2133430

This invention concerns an accessory, to be inserted in drill string behind a drill bit, to provide separation of the liquid and air components of a flushing medium. The accessory comprises an inner housing (36) within an outer housing (34). A liquid/gas medium enters through opening (50) onto spiral raceway (48). Holes are provided at intervals along spiral (42). Liquid in the medium is centrifuged by the spiral (42) and projected into the chamber between inner and outer housings (36, 34). The expelled liquid (52) falls to the base (70) of the housing (34) where it passes through apertures (38) into the drill bore. Once the medium has traversed the spiral (42) essentially only gas remains to pass through the opening (62) to the drill bit.

Accessoire à insérer dans l'étage de forage, en arrière du foret, pour empêcher la séparation des composants liquides et gazeux d'un milieu de rinçage. L'accessoire se compose d'un étui interne (36) logé à l'intérieur d'un boîtier externe (34). Le milieu liquide ou gazeux est admis par un orifice (50) le long des spires (48). Des lumières sont ménagées, à intervalles, le long de ces spires (42). Le liquide contenu dans le milieu subit l'effet d'une force centrifuge qui lui est imprimée par les spires (42) et se trouve projeté dans la chambre définie entre l'étui interne (36) et le boîtier externe (34). Le liquide expulsé (52) retombe à la base (70) du boîtier (34) d'où il passe, par des ouvertures (38), dans l'alésage du foret. Une fois que le milieu a traversé les spires (42) il ne reste pratiquement plus que du gaz qui passe par l'ouverture (62) débouchant sur le foret.

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