Exhaust heat recovering device

Abstract

A waste heat recovery system having a heat pipe provided with a heat switch function limiting an amount of heat transported to a condenser in accordance with the increase in the amount of heating of the evaporator, having the evaporator arranged at an exhaust pipe for carrying exhaust gas of the internal combustion engine, and having the condenser arranged in a cooling water passage for carrying cooling water of the internal combustion engine and using the heat pipe to transport waste heat of exhaust gas to cooling water, characterized in that an insulating part formed between the evaporator and condenser is provided with a wall part for preventing heat transmission from an external fluid.

1 . A waste heat recovery system to transport waste heat of exhaust gas to cooling water, comprising:
 a heat pipe having an evaporator arranged at the exhaust gas pipe for carrying exhaust gas of the internal combustion engine, a condenser arranged in a cooling water passage for carrying cooling water of the internal combustion engine, and a heat switch limiting the amount of heat transported to the condenser in accordance with the increase in the amount of heating of the evaporator, and   an insulating part formed between the evaporator and condenser is provided with a wall part for preventing heat transmission from an external fluid.   
   
   
       2 . A waste heat recovery system as set forth in  claim 1 , wherein the wall part is provided at the upstream side of the flow of the external fluid of the insulating part. 
   
   
       3 . A waste heat recovery system as set forth in  claim 1 , wherein
 wall parts are connected to the evaporator and condenser and are separated by a predetermined amount of clearance formed between the evaporator and the condenser, and   the separated wall parts are connected by an elastic part having elasticity.   
   
   
       4 . A waste heat recovery system as set forth in  claim 1 , wherein
 a plurality of heat pipes are provided,   and first end sides of the plurality of heat pipes are provided with a connector connecting the plurality of heat pipes together.   
   
   
       5 . A waste heat recovery system as set forth in  claim 4 , wherein
 the evaporator is arranged under the condenser, and   the connector is provided at the evaporator end side and arranged at the outer surface or inside of the exhaust pipe.   
   
   
       6 . A waste heat recovery system as set forth in  claim 1 , wherein
 the inside wall of each heat pipe is provided with a wick extending from the evaporator to the condenser, and   the evaporator is arranged above the condenser.   
   
   
       7 . A waste heat recovery system as set forth in  claim 1 , wherein
 an exhaust pipe part forming part of the exhaust pipe and   a cooling water passage part forming part of the cooling water passage are provided,   the exhaust pipe part is joined with the evaporator, and   the cooling water passage part is joined with the condenser.