RU95119188A - HEAT EXCHANGER TYPE "PIPE IN PIPE" - Google Patents

Claims (6)

1. A pipe-in-pipe type heat exchanger comprising a cylindrical body and a flat multichannel swirl tube mounted in it made of aluminum alloy, characterized in that, in order to increase compactness and reduce weight, the tube has a hemispherical relief on the outer surface holes forming a system of smoothly defined protrusions inside the channel of the tube.  2. The heat exchanger type "pipe in pipe" according to claim 1, characterized in that the end walls of the flat tube fit snugly against the inner wall of the housing. 3. The heat exchanger type "pipe in pipe" according to paragraphs. 1 and 2, characterized in that, in order to intensify heat transfer and simplify the technological process of assembly (disassembly), the outer surface of the cylindrical body has a relief in the form of a system of hemispherical holes that form smoothly outlined protrusions placed on the inner wall of the body in a spiral with an angle φ ₂ a twist equal to the angle φ _{1 of the} twist of the inner tube

in increments of the circumference of the inner wall of the housing, a multiple of the circumference of the inner diameter of the housing, and more than the value indicated below
S ₁ > (h + d _B2 ) / cosφ ₂
and spiral pitch along their placement, is greater than or equal to the diameter of the base of projection S ₂ ≥d _c2, where h - the thickness of the inner swirling multichannel tube; S ₁ , S ₂ - steps of the protrusions around the circumference of the inner wall of the housing and along the helical axial lines of the protrusions; d _B2 - the diameter of the hemispherical protrusion on the inner wall of the housing; φ ₁ , φ ₂ - the twist angles of the inner multi-channel tube and helical axial lines of the protrusions; d ₁ - the inner diameter of the housing. 4. The heat exchanger type "pipe in pipe" according to paragraphs. 1 - 3, characterized in that the height and diameter of the protrusions in the channels of the inner tube are related to the dimensions of these channels h _b1 = (0.04 ... 0, 16) d _e1 , d _b1 = (0, 55 ... 0, 8) b _k1 , where h _в1 , d _в1 - the height and diameter of the protrusion in the channels of the inner tube; d _e1 , b _k1 - equivalent diameter and width of the channel of the inner tube. 5. The heat exchanger type "pipe in pipe" according to paragraphs. 1 to 4, characterized in that the height and diameter of the hemispherical protrusions on the inner wall of the cylindrical body depend on the geometric dimensions of the channels formed by this wall and the outer surface of the twisted inner tube h _B2 = (0,05... 0, 1) d _e2 , d _B2 = (10 ... 20)) h _B2 , where h _B2 , d _B2 - the height and diameter of the protrusions on the inner wall of the housing; d _e2 is the equivalent diameter of the channel between the housing and the inner tube.  6. The heat exchanger type "pipe in pipe" according to paragraphs. 1 to 5, characterized in that the relative area of filling with holes in the outer surface of the inner tube is 50 ... 60%.