公开(公告)号：US11826827B2

公开(公告)日：2023-11-28

申请号：US18000830

申请日：2021-10-21

Applicant: NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS

Inventor： Dongdong Gu ,  Xinyu Shi ,  Yanze Li ,  Donghua Dai ,  Qing Ge ,  Yixuan Sun

IPC: B22F12/53 ,  B33Y30/00 ,  B29C64/35 ,  B29C64/209

CPC classification number: B22F12/53 ,  B29C64/35 ,  B33Y30/00 ,  B29C64/209

Abstract: A coaxial powder-feeding nozzle includes a partition wall-type shell, a powder flow area, a cooling liquid flow area and a shielding gas conveying channel. A powder self-cleaning filter is on the outer side of the partition wall-type shell; the powder self-cleaning filter includes a set of powder collecting tubes on each side of the partition wall-type shell in the axial direction; each set of powder collecting tubes includes at least one powder collecting tube; under the coaction of a suction force applied by a powder collecting system and the self-weight of residual powder, a residual powder inlet of each powder collecting tube causes the residual powder on the opposite side to roll down to the bottom along the wall surface of a metal tube to be processed on the same side, and to be gathered at the front end of the residual powder inlet of the powder collecting tube.