Title:
DUAL PIPE
Document Type and Number:
WIPO Patent Application WO/2019/035675
Kind Code:
A2
Abstract:
A dual pipe according to the present invention comprises: an outer pipe having grooves and ridges formed in the outer circumferential surface thereof; and an inner pipe having grooves and ridges formed in the inner circumferential surface thereof and inserted into the outer pipe. In the dual pipe according to the present invention, the inner pipe having spiral grooves and ridges formed in the outer circumferential surface and the outer pipe having spiral grooves and ridges formed in the inner circumferential surface are screw-fastened to each other. A low-pressure refrigerant passes through the inside of the inner pipe. In order to ensure the passage of a high-pressure refrigerant in a space between the outer circumferential surface of the inner pipe and the outer circumferential surface of the inner pipe, a portion of the spiral grooves and ridges formed in the outer circumferential surface of the inner pipe is composed of multiple-spiral grooves and ridges, and a portion of the spiral grooves and ridges formed in the inner circumferential surface of the outer pipe that is screw-fastened to the inner pipe is composed of single-spiral grooves and ridges (specifically, spiral grooves and ridges having a fewer number of threads than the multiple-spiral grooves and ridges of the inner pipe). That is, the high-pressure refrigerant flows through a space between the outer pipe and grooves of spiral grooves and ridges which are not screw-fastened among the multiple-spiral grooves and ridges formed in the outer circumferential surface of the inner pipe.
Inventors:
CHO HAN YONG (KR)
Application Number:
PCT/KR2018/009432
Publication Date:
February 21, 2019
Filing Date:
August 17, 2018
Export Citation:
Assignee:
CHO HAN YONG (KR)
International Classes:
F25B41/00; F16L9/18; F25B40/02; F25B40/06; F28F1/00; F28F1/42
Attorney, Agent or Firm:
DYNE PATENT & LAW FIRM (KR)
Download PDF: