Patent ID: 9447704
Filing Date: 2016-09-20
CPC Classification: F01K,F01N,F02G,F04B,Y02T

Claim Text:
1. A heat recovery system for an internal combustion engine comprising: a heat exchanger, flowed through by a fluidic heat carrier, for transferring the heat from a combustion exhaust gas of the internal combustion engine to the heat carrier, an expansion turbine, flowed through by the heat carrier, for converting the heat transferred to the heat carrier into mechanical work, a cyclically closed duct system for connecting the heat exchanger with the expansion turbine, at least one displacement pump for conveying the heat carrier through the duct system in a predetermined flow direction, a pump drive for driving the at least one displacement pump, an impermeable separating membrane providing a fluid-tight separation of the heat carrier from the pump drive, a bellows surrounding the at least one displacement pump, the bellows having a wall that forms the separating membrane, a hydraulic fluid at least partially filling the bellows, a valve having a starting position, in which the at least one displacement pump conveys the heat carrier through the duct system, and an idle position, in which the at least one displacement pump does not convey the heat carrier through the duct system, and a discharge duct fluidly connecting the bellows with a fluid reservoir, for discharging the hydraulic fluid from the bellows, wherein the valve is configured so that in the starting position the valve blocks the discharge duct, and in the idle position the valve frees the discharge duct in the direction of the fluid reservoir.