Sealing arrangement in rotating control valve of pressure...

B - Operations – Transporting – 25 – D

Patent

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Details

B25D 9/22 (2006.01)

Patent

CA 2756612

The invention relates to a sealing arrangement in a rotating control valve of a pressure fluid-operated percussion device, to which percussion device a tool (5) is mountable movable in its longitudinal direction, the percussion device containing a work chamber (3) and a transmission piston (4) mounted movable to compress the tool (5) suddenly to generate a stress pulse to the tool (5), inlet and outlet channels (7, 9) for conducting pressure fluid to the percussion device and away from it, and a control valve (8) having a rotating switch member with channels to connect inlet and outlet channels (7, 9) through the channels of the switch member to alternately conduct the pressure fluid through the channels to the work chamber (3) and, correspondingly, away from the work chamber (3), and in the inlet channel (7) of the pressure fluid at the switch member side end thereof at least one sealing sleeve (20) for the purpose of sealing the inlet channel (7) to the switch member. In the arrangement, the sealing sleeve is mounted obliquely to the surface of the switch member and the switch member side surface of the sealing sleeve is essentially in the shape of the switch member surface.

L'invention concerne un ensemble d'étanchéité dans une vanne de commande rotative d'un dispositif à percussion actionné par un fluide sous pression. Un outil (5) peut être monté mobile sur ledit dispositif à percussion, dans le sens longitudinal de ce dernier. Ledit dispositif à percussion comprend une chambre de travail (3) et un piston de transmission (4) monté mobile pour comprimer l'outil (5) de manière soudaine afin que soit générée une impulsion de contrainte sur l'outil (5); des canaux d'entrée et de sortie (7, 9) pour amener le fluide sous pression au dispositif à percussion et l'éloigner de celui-ci; une vanne de commande (8) possédant un élément de commutation rotatif avec des canaux pour relier les canaux d'entrée et de sortie (7, 9) pour amener le fluide sous pression par l'intermédiaire des canaux jusqu'à la chambre de travail (3) et, de manière correspondante, éloigner le fluide de la chambre de travail (3); et dans le canal d'entrée (7) du fluide sous pression sur l'extrémité latérale de l'élément de commutation, au moins un manchon d'étanchéité (20) conçu pour rendre étanche le canal d'entrée (7) par rapport à l'élément de commutation. Dans ledit ensemble, le manchon d'étanchéité est monté oblique par rapport à la surface de l'élément de commutation et la surface latérale de l'élément de commutation du manchon d'étanchéité présente sensiblement la même forme que la surface de l'élément de commutation.

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