FLOW DEVICE AND FLOW METHOD FOR AN ADDITIVE MANUFACTURING DEVICE, AND ADDITIVE MANUFACTURING DEVICE WITH SUCH A FLOW DEVICE

摘要

Flow device for an additive manufacturing device (1) for manufacturing a three-dimensional object (2) by means of selectively solidifying a construction material layer by layer in a construction region (10), comprising: a process chamber (3), a gas supply apparatus for producing a gas flow in the additive manufacturing device (1), at least one gas inlet (32, 43, 132, 232) for introducing the gas stream into the process chamber (3), and at least one gas outlet (34, 35) for discharging the gas flow out of the process chamber (3), and a gas feed line (30) which is provided outside the process chamber (3) in order to introduce gas to the at least one gas inlet (32, 43, 132, 232), wherein the gas feed line (30) comprises at least one first line portion (31, 41) which adjoins the gas inlet (32, 43, 132, 232) and which extends over a length (L) along a first extension direction of the gas feed line (30), wherein the first extension direction is substantially straight and wherein the first line portion (31, 41) extends over a maximum value of a width (B) which extends transversely with respect to the first extension direction and parallel to the construction region (10), and wherein the length (L) of the first line portion (31, 41) is at least as great as half the maximum value of the width (B), and wherein the first line portion (31, 41) also comprises a first portion (51) which is at a distance from the gas inlet (32, 43, 132, 232) and which, in addition to a wall of the first line portion (31, 41), comprises at least one first flow rectification unit (54 150) which is designed to align the gas flow substantially in the first extension direction.