US 12,292,239 B2
Double tube for heat-exchange
Kilnam Lee, Nonsan-si (KR); Steffen Hendrik, Cheonan-si (KR); Jonghoon Cha, Cheonan-si (KR); Jinwon Ko, Cheongju-si (KR); Ji Yeon Lee, Cheongju-si (KR); Hyunjin Im, Cheonan-si (KR); and Sunphil Ga, Cheongju-si (KR)
Assigned to ContiTech Fluid Korea Ltd., Jeonju-si (KR)
Filed by ContiTech Fluid Korea Ltd., Jeonju-si (KR)
Filed on Jun. 10, 2021, as Appl. No. 17/303,898.
Application 17/303,898 is a continuation of application No. 16/303,632, granted, now 11,060,795, previously published as PCT/KR2017/005296, filed on May 22, 2017.
Claims priority of application No. 10-2016-0061878 (KR), filed on May 20, 2016.
Prior Publication US 2022/0011050 A1, Jan. 13, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. F28D 7/10 (2006.01); F16L 41/02 (2006.01); F28D 7/02 (2006.01); F28F 1/08 (2006.01); F28F 9/02 (2006.01)
CPC F28D 7/106 (2013.01) [F16L 41/021 (2013.01); F28D 7/024 (2013.01); F28F 1/08 (2013.01); F28F 9/0248 (2013.01); F28F 2210/06 (2013.01); F28F 2265/26 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A double tube for heat exchange, the double tube comprising:
a spiral pipe having ridges and valleys alternately formed on a circumferential surface thereof along a spiral track thereof and guiding a first fluid to flow therethrough;
an outer pipe receiving the spiral pipe axially inserted thereinto and guiding a second fluid to flow along the circumferential surface of the spiral pipe in an axial direction such that the second fluid exchanges heat with the first fluid;
a first pipe expansion joint coupled to a first end of the spiral pipe and the outer pipe;
a second pipe expansion joint coupled to a second end of the spiral pipe and the outer pipe;
the first pipe expansion joint having a flattened portion formed by flattening a curved circumferential surface of the first inner pipe expansion joint, the flattened portion configured to facilitate weldability;
a first port for the second fluid and the first port is welded on the flattened portion of the first inner pipe expansion joint, the first port configured to receive the second fluid as a high temperature and high pressure fluid;
a second port for the second fluid and attached to the second inner pipe expansion joint, the second port configured to discharge the second fluid as heat exchanged second fluid;
the flattened portion creates a space expansion portion separately formed in an inner surface of the first pipe expansion joint to mitigate welding defects and reduce flow-induced noise;
a plurality of resistance members; and
wherein a resistance member of the plurality of resistance members is formed across a plurality of valleys.