Toshimichi Kobayashi

TL;DR: In this article, a flat tube with an inner fin for an EGR cooler for preventing soot or the like from adhering inside was provided, and the inner fin had a recessed or projected turbulence forming part on a inner surface side.

TL;DR: In this article, a drain hole is provided in one end part of a reversing plate constituting a partition plate, while a gas inlet-outlet 8 is opened in the other end part thereof.

Abstract: PROBLEM TO BE SOLVED: To provide a corrosion resistance and a heat resistance and minimize the use of a brazing material as much as possible by forming a flat gas passage inside the plane of an annular aqueduct between elements and causing the flat gas passage to communicate with a pair of gas communicating holes. SOLUTION: In a cup plate type heat exchanger, a pair of first plate 1 and second plate 2 form an element 3. Each of the plates 1 and 2 has a substantially square peripheral wall on a plane and is provided with a narrow brazing flange part 4 on its entire peripheral edge, and a pair of water communicating hole 5 and gas communicating hole 6 formed toward a central side with a prescribed distance from the peripheral wall at each of diagonal corner parts. Then, the second plate 2 is provided with a a groove shaped annular aqueduct 7 square on a place and flat on a bottom which is adjacent to the flange part 4, and a flat aqueduct 9 communicates with the annular aqueduct 7. Then, a plurality of elements 3 are laminated to form a flat gas passage 10 inside the plane of the annular aqueduct 7 between the elements 3. A pair of gas communicating holes 6 communicate with the passage 10. Thus, the high temperature corrosion of the plates and the brazing part and the destruction of a base metal due to a thermal stress or the like can be prevented.

TL;DR: In this paper, the authors proposed a wavy fin of an exhaust gas cooling heat exchanger for preventing plugging from being possibly caused in an outlet portion of the fin by soot in exhaust gas.

TL;DR: In this article, the authors proposed an EGR cooler with a pair of mutually matching groove-shaped bodies 2 and 3, which integrally form a tank part 7 corresponding to a half in both end parts and a casing part 8 in an intermediate part by the press molding.