Exhaust gas heat recovery device
AssigneeToyota Jidosha Kabushiki Kaisha
InventorTeturo Ohtani
Life of this patent
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Abstract
An exhaust heat recovery device with which a coolant medium in a heat exchanger can be prevented from reaching high temperatures is provided. An exhaust heat recovery system 10 is provided with an heat exchanger 18 that performs heat exchange between exhaust gas and a coolant medium; and a natural convection water pipe 56 whose one end is connected to an upper portion in the direction of gravity of an engine coolant water pipe 42 in the heat exchanger 18 and whose other end is connected to a lower portion in the direction of gravity of the engine coolant water pipe 42, and whose intermediate portion is positioned at the outer side of the heat exchanger 18.
Claims7
An exhaust heat recovery device comprising:
- a heat exchanger comprising:
- a shell having an exhaust channel through which the exhaust gas flows and a coolant medium channel provided adjacent to the exhaust channel through which the coolant medium flows;
- a first linking channel that communicates an outside of the shell and an upper portion of the coolant medium channel in the direction of gravity at one end of the coolant medium channel in the coolant medium flow direction;
- a second linking channel that communicates the outside of the shell and a lower portion of the coolant medium channel in the direction of gravity at the other end of the coolant medium channel in the coolant medium flow direction, the second linking channel including a ring pipe that is arranged coaxially with the coolant medium channel at a downstream side of the exhaust gas flow direction;
- and
- a heat insulating unit that insulates a portion of the second linking channel positioned inside the shell from the exhaust gas.
Dependencies are inferred from the claim text.