| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust heat recovery unit capable of sufficiently insulating heat of a heat exchange portion in an operation mode in which an exhaust gas is guided while bypassing the heat exchange portion.SOLUTION: A flowing direction of an exhaust gas is directed to a heat exchange portion 2 or a bypass portion 3 by rotating a valve 70 around a valve shaft 75 as a center. A boundary portion 45 has an upstream-side plate 41 extended to the inside of a branch portion 4 from between the heat exchange portion 2 and the bypass portion 3. The upstream-side plate 41 has a tip end 41a opposed to a downstream side of the valve shaft 75 in the flowing direction of the exhaust gas, and a base end 41b forming an air layer 9 between the heat exchange portion 2 and the bypass portion 3.SELECTED DRAWING: Figure 3 |
