Exhaust heat recovery system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsManabu Orihashi, Tadashi Nakagawa, Yoshio Hasegawa, Yasuhiro Kaya
Life of this patent
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Abstract
An exhaust heat recovery system (10) includes: an exhaust heat exchanger (18) that is communicated with a catalytic converter (16) through an exhaust gas pipe (14A), and that recovers exhaust heat into a coolant; and heat transfer restriction means (50) provided between the catalytic converter (16) and the exhaust heat exchanger (18). The heat transfer restriction means (50) includes a heat insulator (56) disposed between a first exhaust gas pipe (52) and a second exhaust gas pipe (54) that constitute the exhaust gas pipe (14A), and. restrains a released heat from the catalytic converter (16) from reaching the exhaust heat exchanger (18).
Claims13
An exhaust heat recovery system, comprising:
- an exhaust heat exchanger that is communicated with a heat source through an exhaust gas channel, and that recovers exhaust heat to a coolant;
- and
- heat transfer restriction section for restraining released heat from the heat source from reaching the exhaust heat exchanger, which is provided on an exhaust gas pipe that forms the exhaust gas channel and that is provided between the heat source and the exhaust heat exchanger, wherein
- the heat transfer restriction section is a heat release member that extends out from an outer surface of the exhaust gas pipe, wherein the heat transfer restriction section takes a heat-radiating posture at which the heat transfer restriction section extends out from the outer surface of the exhaust gas pipe in a case where an ambient temperature is higher than or equal to a first predetermined temperature, whereas the heat transfer restriction section takes a heat radiating-restricting posture at which the heat transfer restriction section is closer to the exhaust gas pipe, the heat source or the exhaust heat exchanger than when the heat transfer restriction section takes the heat-radiating posture in a case where the ambient temperature is below a second predetermined temperature that is lower than or equal to the first predetermined temperature.
An exhaust heat recovery system, comprising:
- an exhaust heat exchanger that is communicated with a heat source through an exhaust gas channel, and that recovers exhaust heat to a coolant;
- and
- heat transfer restriction section for restraining released heat from the heat source from reaching the exhaust heat exchanger, which is provided between the heat source and the exhaust heat exchanger, wherein
- the exhaust heat exchanger has a heat exchange channel that is branches from and separated from the exhaust gas channel by a partition wall, and in which heat exchange between the exhaust gas and the coolant occurs,
- the heat transfer restriction section is formed by mirror-finishing a face of the partition wall of the exhaust heat exchanger, which is near the exhaust gas channel,
- the partition wall includes an inner wall that is disposed near the exhaust gas channel and that has a mirror-finished inner face, and an outer wall that is spaced from the inner wall and that is disposed near the heat exchange channel, and
- a heat-insulating layer is formed between the inner wall and the outer wall.
Dependencies are inferred from the claim text.