Exhaust heat recovery device

Abstract

An exhaust heat recovery device able to secure heat exchange performance even when tilted, provided with an evaporator exchanging heat between an exhaust gas and an evaporable and condensable working fluid sealed inside it and thereby evaporating the working fluid and a condenser exchanging heat between the working fluid evaporated by the evaporator and the cooling water and thereby condensing the working fluid, wherein the evaporator and condenser are arranged in a closed loop channel through which the working fluid circulates, the evaporator and condenser are arranged adjoining each other in the substantially horizontal direction, the evaporator is provided with a plurality of evaporation side heat pipes arranged in parallel and is provided with a first evaporation side header communicating one ends of the plurality of evaporation side heat pipe and a second evaporation side header communicating the other ends, and, when mounted in a vehicle in a horizontal state, the second evaporation side header arranged at the bottom among the two evaporation side headers is arranged with the side far from the condenser positioned lower than the side close to it.

1 . An exhaust heat recovery device carried in a vehicle using an internal combustion engine as a drive source for operation and provided with
 an evaporator arranged in an exhaust gas passage through which exhaust gas exhausted from the internal combustion engine runs, exchanging heat between the exhaust gas and an evaporable and condensable working fluid sealed inside it, and thereby evaporating the working fluid and   a condenser arranged in the cooling water passage through which cooling water of the internal combustion engine runs, exchanging heat between the working fluid evaporated by the evaporator and cooling water, and thereby condensing the working fluid, wherein   the evaporator and condenser are arranged in a closed loop channel through which the working fluid circulates,   the evaporator and condenser are arranged to adjoin each other in the substantially horizontal direction,   the evaporator has a plurality of evaporation side heat pipes arranged in parallel and is provided with a first communicating part communicating with first ends of the plurality of evaporation side heat pipes and a second communicating part communicating with the other ends, and,   when mounted in a vehicle in the horizontal state, the second communicating part arranged at the bottom among the two communicating parts is positioned with the side far from the condenser lower than the side near it.   
   
   
       2 . An exhaust heat recovery device as set forth in  claim 1 , further provided with:
 an evaporation side connecting part guiding said working fluid evaporated by said evaporator to said condenser and   a condensation side connecting part guiding said working fluid condensed at said condenser to said evaporator,   when mounted in a vehicle in the horizontal state, said condensation side connecting part being positioned with the side far from said condenser lower than the side close to said condenser.   
   
   
       3 . An exhaust heat recovery device carried in a vehicle using an internal combustion engine as a drive source for operation and provided with
 an evaporator arranged in an exhaust gas passage through which exhaust gas exhausted from the internal combustion engine runs, exchanging heat between the exhaust gas and an evaporable and condensable working fluid sealed inside it, and thereby evaporating the working fluid,   a condenser arranged in the cooling water passage through which cooling water of the internal combustion engine runs, exchanging heat between the working fluid evaporated by the evaporator and cooling water, and thereby condensing the working fluid,   an evaporation side connecting part guiding said working fluid evaporated at said evaporator to said condenser, and   a condensation side connecting part guiding said working fluid condensed at said condenser to said evaporator,   when mounted in a vehicle in the horizontal state, the condensation side connecting part being positioned with the side far from said condenser below the side close to said condenser.   
   
   
       4 . An exhaust heat recovery device as set forth in  claim 1 , wherein when mounted in a vehicle in the horizontal state, the bottom ends of said evaporation side heat pipes at the side far from said condenser among the plurality of evaporation side heat pipes are positioned lower than the bottom ends of said evaporation side heat pipes at the close side. 
   
   
       5 . An exhaust heat recovery device as set forth in  claim 1 , further provided with a valve mechanism provided at a downstream side in said condenser and switching the channel through which the condensed working fluid flows into said evaporator.