Inner fin for heat exchanger flat tubes and evaporator

• Main Authors: HIGASHIYAMA NAOHISA, TSUKAHARA MASAYUKI
• Format: Patent
• Language: English
• Published: 27.09.2005
• Edition: 7
• Subjects: BLASTING; CLADDING OR PLATING BY SOLDERING OR WELDING; COMBINED HEATING AND REFRIGERATION SYSTEMS; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OFGENERAL APPLICATION; HEAT EXCHANGE IN GENERAL; HEAT PUMP SYSTEMS; HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS,IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT; HEATING; LIGHTING; LIQUEFACTION SOLIDIFICATION OF GASES; MACHINE TOOLS; MANUFACTURE OR STORAGE OF ICE; MECHANICAL ENGINEERING; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; REFRIGERATION MACHINES, PLANTS OR SYSTEMS; REFRIGERATION OR COOLING; SOLDERING OR UNSOLDERING; TRANSPORTING; WEAPONS; WELDING; WORKING BY LASER BEAM

The present invention relates to an inner fin 5 for heat exchanger flat tubes 22 A which comprises a metal plate having a corrugated cross section and which is to be enclosed in the flat tube 22 A, all ridges 51 and all furrows 52 of the inner fin being joinable to an inner surface of the flat tube 22 A by brazing. At least one of the ridges 51 and the furrows 52 of the inner fin 5 is provided with a turbulence promoting protrusion 53 facing toward a side opposite to the side to be brazed. The turbulence promoting protrusion 53 is so sized that a clearance to be created between a caved portion 54 formed on a rear side of the protrusion and the inner surface of the flat tube 22 A can be filled with a brazing material 6. A fluid to be passed through the flat tube 22 A is caused to flow in a more turbulent state by the protrusion 53 to thereby achieve an improved heat transfer efficiency.