To provide a double pipe whose chattering sounds are prevented due to the intermittent contact of an outer pipe with an inner pipe during vibration.
The double pipe 1 comprises the outer pipe 11, the inner pipe 12 passing through the outer pipe 11 through both ends 11b, 11c of the outer pipe 11, and branch pipes 16 inserted into both ends 11b, 11c of the outer pipe 11, respectively. Both ends 11b, 11c of the outer pipe 11 are provided with an approximately cylindrical inner pipe supporting portion 13 for closing and supporting the inner pipe 12 and an approximately cylindrical branch pipe supporting portion 15 for closing and supporting the branch pipe 16. The inner pipe supporting portion 13 is located approximately parallel to the extending direction of a general part 11a of the outer pipe 11, inside the general part 11a of the outer pipe 11 in a projection view along the extending direction of the general part 11a of the outer pipe 11.
TAKAMATSU YOSHIKAZU
SATO SUSUMU
Iwa Saki Kokuni
Kawamata Sumio
Masakazu Ito
Shunichi Takahashi
Toshio Takamatsu