Abstract: Provided is an inexpensive scrape-off type heat exchanger that is simple in construction, eliminating the need for using a pump for forcibly feeding the process fluid. With the scrape-off type heat exchanger (1), when a suction delivery element (30) which is rotated, while making a reciprocating motion, being closely contacted with an inner wall (200) of the heat transfer tube (20), is traveled from the process fluid inlet part (21) side toward a process fluid outlet part (22), the process fluid is sucked from a process fluid inlet part (21) into the inside of the heat transfer tube (20), and at the same time, the process fluid, which has already been sucked in, passed through the suction delivery element (30), and discharged to the process fluid outlet part (22) side, through the check valves 310, 320, is forced out to the process fluid outlet part (22).

Abstract: Provided is an inexpensive scrape-off type heat exchanger that is simple in construction, eliminating the need for using a pump for forcibly feeding the process fluid. With the scrape-off type heat exchanger (1), when a suction delivery element (30) which is rotated, while making a reciprocating motion, being closely contacted with an inner wall (200) of the heat transfer tube (20), is traveled from the process fluid inlet part (21) side toward a process fluid outlet part (22), the process fluid is sucked from a process fluid inlet part (21) into the inside of the heat transfer tube (20), and at the same time, the process fluid, which has already been sucked in, passed through the suction delivery element (30), and discharged to the process fluid outlet part (22) side, through the check valves 310, 320, is forced out to the process fluid outlet part (22).

Abstract: A cylindrical pipe which is excellent in heat transfer characteristic and has no accumulation of liquid, wherein a flat-shaped portion (2) along the pipe axis (L) is formed inside the cylindrical pipe (1) formed in corrugated shape. As a method for manufacturing said pipe, the present invention provides a pipe manufacturing method, wherein a thin-wall blank cylindrical pipe (P) is fed in increments of a prescribed distance, while being rotated at a definite speed, a roller die (85) being pressed against the outer periphery of the cylindrical pipe, the roller die being advanced and retracted in accordance with the feed of the cylindrical pipe, for forming a spiral corrugation such that the groove depth thereof is gradually increased, starting from the flat portion of the cylindrical pipe, and reaches a maximum in the portion opposed to the flat one.

Abstract: A cylindrical pipe which is excellent in heat transfer characteristic and has no accumulation of liquid, wherein a flat-shaped portion (2) along the pipe axis (L) is formed inside the cylindrical pipe (1) formed in corrugated shape. As a method for manufacturing said pipe, the present invention provides a pipe manufacturing method, wherein a thin-wall blank cylindrical pipe (P) is fed in increments of a prescribed distance, while being rotated at a definite speed, a roller die (85) being pressed against the outer periphery of the cylindrical pipe, the roller die being advanced and retracted in accordance with the feed of the cylindrical pipe, for forming a spiral corrugation such that the groove depth thereof is gradually increased, starting from the flat portion of the cylindrical pipe, and reaches a maximum in the portion opposed to the flat one.