Patent ID: 9664087
Date: 2017-05-30
CPC Classifications: F01N,F02D,F02G,F02M,F16K,F28D,F28F,Y02T

Claim:
1. An exhaust gas heat recovery system comprising: a housing including an inlet, an outlet, a first exhaust gas pathway in communication with the inlet and the outlet, and a second exhaust gas pathway in communication with the inlet and the outlet; a valve member disposed within the housing and movable between a first position allowing fluid flow through the first exhaust gas pathway and substantially preventing fluid flow through the second exhaust gas pathway and a second position allowing fluid flow through the second exhaust gas pathway; and a heat exchanger in communication with the second exhaust gas pathway and including a conduit having a fluid flowing therein, the fluid being in thermal communication with exhaust gas in the heat exchanger when the valve member is in the second position and substantially thermally isolated from the exhaust gas when the valve member is in the first position, the heat exchanger being substantially fluidly isolated from the first exhaust gas pathway when the valve member is in the first position, and the valve member guides fluid flow in a U-shaped flow path through the heat exchanger when the valve member is in the second position, wherein the valve member substantially blocks flow paths into and out of the second exhaust gas pathway when the valve member is in the first position, wherein the housing includes a heat exchange conduit extending between a shaft of the valve member and the heat exchanger, the heat exchange conduit being entirely open and free from obstructions between the shaft and the heat exchanger when the valve member is in the first position, and wherein an opening of the heat exchange conduit is divided only by the valve member when the valve member is in the second position, wherein the valve member is positioned within the housing such that fluid flow through the inlet while the valve member is in the second position biases the valve member toward the first position and fluid flow through the inlet while the valve member is in the first position restricts movement of the valve member toward the second position.