TUBE FOR HEAT EXCHANGER AND HEAT EXCHANGER

• Main Authors: NINAGAWA TOSHIHIDE, TERAMOTO YUUKI, TAKEWAKA SHIN, OZAKI TATSUO
• Format: Patent
• Language: English
• Published: 28.10.2010
• Subjects: ALLOYS; BLASTING; CHEMISTRY; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OFGENERAL APPLICATION; FERROUS OR NON-FERROUS ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEAT EXCHANGE IN GENERAL; HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS,IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT; HEATING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; LIGHTING; MACHINE TOOLS; MECHANICAL ENGINEERING; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WEAPONS; WELDING; WORKING BY LASER BEAM

PROBLEM TO BE SOLVED: To provide a tube for a heat exchanger with high strength and excellent brazing property, and the heat exchanger, while suppressing the manufacturing cost. SOLUTION: Three-layer clad material of aluminum alloy comprises a core material layer 21 which Mg is added to, a brazing material layer 20 with the melting point lower than 600°C formed on one surface of the core material 21, and a sacrifice material layer 22 with the melting point not lower than 600°C formed on the other surface of the core material 21. The three-layer clad material is bent and molded so as to form an overlapping part 15 at least partially, and the overlapping part 15 is joined by brazing to form the tube for a heat exchanger. The core material layer 21 includes not less than 0.2wt.% Mg after the brazing. The thickness of the brazing material layer 20 is not less than 25 μm before the brazing. The overlapping part 15 has a structure of joining the brazing material layer 20 and the sacrifice material layer 22 facing to each other, and heating time at temperature of 450°C or higher during brazing is within 12 minutes. COPYRIGHT: (C)2011,JPO&INPIT