US 12,297,939 B2
Composite pipe formed by combining a main portion and a short pipe portion, and connection structure of the same
Manhyuk Bang, Jinju-si (KR)
Appl. No. 18/032,809
Filed by Manhyuk Bang, Jinju-si (KR)
PCT Filed Oct. 14, 2021, PCT No. PCT/KR2021/014286
§ 371(c)(1), (2) Date Apr. 20, 2023,
PCT Pub. No. WO2022/092640, PCT Pub. Date May 5, 2022.
Claims priority of application No. 10-2020-0143991 (KR), filed on Oct. 31, 2020.
Prior Publication US 2024/0003470 A1, Jan. 4, 2024
Int. Cl. F16L 23/024 (2006.01); F16L 9/04 (2006.01); F16L 13/02 (2006.01); F16L 58/18 (2006.01)
CPC F16L 23/024 (2013.01) [F16L 9/04 (2013.01); F16L 58/187 (2013.01); F16L 13/0209 (2013.01); F16L 58/181 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A composite pipe comprising:
a main portion; and,
a short pipe portion having a shorter length than the main portion;
wherein the short pipe portion is coupled to a first end of both ends of the main portion to be watertight, and liquid or gas can move through the short pipe portion and the main portion,
wherein the main portion comprises
an outer pipe;
an inner pipe inserted into the outer pipe; and,
a resin layer formed to cover an outer surface of the outer pipe;
wherein the short pipe portion and the inner pipe are made of a material having greater corrosion resistance than the outer pipe,
wherein a groove or a protrusion is continuously formed on an outer surface of the short pipe portion along a circumferential direction,
wherein an end side of the short pipe portion is coupled to an end side of the outer pipe so as to be watertight,
wherein the inner pipe extends further into the short pipe portion than the outer pipe, and an extended portion of the inner pipe is bonded or welded to an inner surface of the short pipe portion, and
wherein a length of the extended portion is shorter than the length of the short pipe portion, and a portion of the short pipe portion to which the inner pipe is not extended is exposed to the liquid or gas.