To provide a multi-drilled pipe and branch pipe connecting structure for reliably and easily connecting a plurality of branch pipes to a terminal portion of a multi-drilled pipe whose inside is partitioned into a plurality of communication holes.
A partition wall 3 for partitioning the inside of the multi-drilled pipe 1 has a cutout portion 6 whose length is within an insertion allowance L of the branch pipe 10 from the terminal, and the terminal portion of the multi-drilled pipe 1 is formed into a flared portion 7 whose diameter is enlarged outside to the terminal. Thus, when each branch pipe 10 is inserted into the terminal portion of the multi-drilled pipe 1, molten brazing material flows into the cutout portion 6 instead of the outside of an outer pipe portion 2 and uniformly flows between the partition wall 3 and the branch pipe 10, because the cutout portion 6 is located on the lower side of the opening edge of the outer pipe portion 2. The molten brazing material is received by a gap on the inner periphery side of the flared portion 7, and so it is prevented from leaking or running to the outside of the multi-drilled pipe 1 or the branch pipe 10.
COPYRIGHT: (C)2006,JPO&NCIPI
Yukazu Takamatsu
| JP2005195048A |
Iwa Saki Kokuni
Kawamata Sumio
Masakazu Ito
Shunichi Takahashi
Toshio Takamatsu