BRAZING STRUCTURE FOR FLAT TUBE AND HEADER PLATE OF HEAT EXCHANGER

• Main Authors: OKUBO, Atsushi, SAKAI, Taiji, KOMURO, Akira
• Format: Patent
• Language: English; French; Japanese
• Published: 25.03.2021
• Subjects: BLASTING; 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; 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; LIGHTING; MACHINE TOOLS; MECHANICAL ENGINEERING; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; WEAPONS; WELDING; WORKING BY LASER BEAM

The present invention reduces and mitigates thermal stress generated at joint portions between a header plate and a flat tube of a heat exchanger.　In a direction of a vertical center axis 6 passing the center of the inside of a flat tube 3, positions of first brazing parts 10 are set to be closer to the center of the flat tube 3 in the direction of the vertical center axis 6 than positions of edge brazing parts 8. Accordingly, the thermal stress concentrated at the joint portions between short sides of the flat tube 3 and the header plate is dispersed to other portions. La présente invention réduit et atténue la contrainte thermique générée au niveau de parties de jonction entre une plaque collectrice et un tube plat d'un échangeur de chaleur.　Dans une direction d'un axe central vertical (6) passant le centre de l'intérieur d'un tube plat (3), des positions des premières parties de brasage (10) sont définies de sorte à être plus proches du centre du tube plat (3) dans la direction de l'axe central vertical (6) que les positions des parties de brasage de bord (8). Par conséquent, la contrainte thermique concentrée au niveau des parties de jonction entre les côtés courts du tube plat (3) et la plaque collectrice est dispersée vers d'autres parties. 熱交換器のヘッダプレートと偏平チューブとの接合部に生じる熱応力を低減し緩和すること。　偏平チューブ３の内部の中心を通る垂直中心軸６方向において、第１ろう付部１０の位置が、端部ろう付部８の位置よりも、偏平チューブ３の垂直中心軸６方向の中央側に位置するようにする。これにより、偏平チューブ３の短辺部とヘッダプレートとの接合部に集中する熱応力を各部に分散させる。