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1. (WO2018065410) DEVICE FOR GENERATING A JET OF LIQUID

Pub. No.:    WO/2018/065410    International Application No.:    PCT/EP2017/075071
Publication Date: Fri Apr 13 01:59:59 CEST 2018 International Filing Date: Wed Oct 04 01:59:59 CEST 2017
IPC: B23K 26/70
B23K 26/146
Applicants: SYNOVA SA
Inventors: ANDEREGG, Ludovic
MARTIN, Ronan
DIEHL, Helgi
RICHERZHAGEN, Bernold
Title: DEVICE FOR GENERATING A JET OF LIQUID
Abstract:
The present application relates to a device for generating a jet of liquid propagating along a jet axis (A), said jet of liquid guiding a laser beam. The device comprises a distribution chamber (5) with at least one inlet (10) and at least one outlet (11) for the liquid, said distribution chamber (5) being of an annular shape encircling said jet axis (A). The distribution chamber (5) has a first effective liquid flow cross-section area S1. The device further includes an acceleration chamber (7) having at least one inlet (12) and one outlet for the liquid and a window (3) transparent to said laser beam to introduce said laser beam into said acceleration chamber (7) through said window (3). The window (3) is arranged in line with the jet axis (A) to enable the introduction of the laser beam coaxial to said jet axis (A). Said acceleration chamber (7) has an entrance cross-section S3 defined by a surface area of a cylinder barrel of a geometric cylinder arranged coaxially to the jet axis (A), said cylinder barrel having a radius corresponding to the smallest distance between the jet axis (A) and said at least one inlet of the acceleration chamber (7), wherein the area of the cylinder barrel being located within said acceleration chamber (7). A nozzle for generating said jet of liquid is arranged in said outlet of the acceleration chamber (7) and defines a direction of the jet axis (A). At least one connection passage (6) extends from the at least one outlet (11) of the distribution chamber (5) to the at least one inlet (12) of the acceleration chamber (7), said at least one connection passage (6) having a second effective liquid flow cross-section area S2. The second effective liquid flow cross-section area S2 is smaller than the first effective liquid flow cross-section area S1, preferably by an order of magnitude (S2/S1 « 1) and the second effective liquid flow cross-section area S2 is smaller than the entrance cross-section S3 (S2/S3 < 1). The device comprises a wall element (2) having a central opening, wherein a nozzle holder (4) comprising the nozzle and a window element comprising the window (3) are arranged one above the other within said central opening, said nozzle holder (4) and said window element being spaced from each other along said jet axis, said spacing defining said acceleration chamber (7), wherein said connection passage and said distribution chamber (5) are formed within said nozzle holder (4).