"TUBE-IN-TUBE"-TYPE HEAT EXCHANGING MEMBER Russian patent published in 1995 - IPC

FIELD: fast breeder nuclear reactors. SUBSTANCE: "tube-in-tube"-type heat exchanging member has coaxial internal straight tube 1, as well as intermediate tube 2, and external corrugated tube 3. Spiral members 4 and 5 are placed in troughs of the corrugations. Faces of intermediate tube 2 and external tube 3 are supplied with bottoms 6, 7 installed so to form a spacing. Internal tube 1 is supplied with spiral ribs 8, making contact with crests of corrugations of intermediate tube 2. Spiral member 4 placed in troughs of the latter comes in contact with corrugation crests of external tube 3. Internal tube 1 may be supplied with additional coaxial shell 9 spaced with annual gap to place spacer 10. Tubes 1 through 3 are secured in tube sheets 11 through 13. Placing spiral ribbing 8 making contact with corrugation crests of intermediate tube 2, and spiral member 4 in troughs of the latter to come in contact with corrugation crests of external tube 3 allows one to carry out intensive heat exchange between heated and intermediate coolants and adhere to reliable gap between tubes 1 through 3 and structural stiffness at different coolant pressures. Additional coaxial shell 9 with spacer 10 installed on internal tube 1 allows one to isolate tube 1 to increase stability in natural convection process on heated coolant. EFFECT: enhanced reliability of power plants with fast breeder reactors. 2 cl, 3 dwg