Device for dispensing fluid jets without a rotating joint

A device for dispensing one or more jets of fluid (6) comprising a fluid conveying pipeline (7) configured to feed a fluid to one or more fluid dispensing nozzles (5) arranged at the downstream end of said pipeline (7), and a motor (1) collaborating with the fluid conveying pipeline (7) via a rotary transmission shaft (2) and a transmission mechanism (4a, 4b), in which device:

• the fluid conveying pipeline (7) comprises an upstream portion (7a) of first axis (XX) and a downstream portion (7b) of second axis (YY), the first and second axes (XX, YY) between them making an angle (α) of between 5 and 50°,
• the downstream portion (7b) of second axis (YY) comprising the downstream end of the pipeline (7) with said fluid dispensing nozzle or nozzles, and wherein the transmission mechanism (4a, 4b) comprises motion-inducing elements capable of acting on said downstream portion (7b) of pipeline to impart a determined movement to it,
• further wherein the transmission mechanism (4a, 4b) comprises:
• a support pinion (4b) capable of rotational movement about a rotation axis situated at the center of said support pinion (4b),
• the fluid conveying pipeline (7) being positioned eccentrically and running freely through said support pinion (4b), and
• a pinion drive (4a) collaborating with the support pinion (4b),
• and the fluid conveying pipeline collaborates with an anchor (8) arranged on the pipeline upstream of the support pinion (4b), said anchor (8) forming all or part of a setting system configured to allow adjustment the length of fluid conveying pipeline between the anchor (8) and the downstream end of said pipeline (7).

A method for stripping or scalping concrete with a jet of nitrogen comprising directing the jet of nitrogen at the concrete from a device dispensing one or more jets (6) of liquid nitrogen at a pressure of at least 1500 bar and at a temperature of below −140° C., the device comprising a liquid nitrogen conveying pipeline (7) feeding one or more liquid nitrogen dispensing nozzles (5) arranged at the downstream end of said pipeline (7), and a motor (1) collaborating with the liquid nitrogen conveying pipeline (7) via a rotary transmission shaft (2) and a transmission mechanism (4a, 4b), in which device the liquid nitrogen conveying pipeline (7) comprises an upstream portion (7a) of first axis (XX) and a downstream portion (7b) of second axis (YY), the first and second axes (XX, YY) between them making an angle (α) of between 5 and 50°, the downstream portion (7b) of second axis (YY) carrying the downstream end of the pipeline (7) with said liquid nitrogen dispensing nozzle or nozzles, and the transmission mechanism (4a, 4b) comprises motion-inducing elements acting on said downstream portion (7b) of pipeline to impart a determined movement to it, said transmission mechanism (4a, 4b) comprising a support pinion (4b) capable of rotational movement about a rotation axis situated at the center of said support pinion (4b), the liquid nitrogen conveying pipeline (7) being positioned eccentrically and running freely through said support pinion (4b), and also a pinion drive (4a) collaborating with the support pinion (4b), characterized in that the fluid conveying pipeline collaborates with an anchor (8) arranged on the pipeline upstream of the support pinion (4b), said anchor (8) forming all or part of a setting system and in that the length of fluid conveying pipeline measured between the anchor (8) and the downstream end of said pipeline (7) is chosen or adjusted by a step of acting on said setting system.