	US 7,500,359 B2
	Reverse flow heat exchanger for exhaust systems
Lincoln Evans-Beauchamp, Palo Alto, Calif. (US)
Assigned to Purify Solutions, Inc., Palo Alto, Calif. (US)
Filed on Apr. 26, 2006, as Appl. No. 11/412,481.
Prior Publication US 2007/0251222 A1, Nov. 01, 2007
Int. Cl. F01N 3/00 (2006.01)

U.S. Cl. 60—298 [60/299; 60/320; 60/321; 60/323; 165/97; 165/DIG. 100]

27 Claims

1. An exhaust system comprising:

an engine configured to propel a vehicle and to produce exhaust gas;

a first exhaust manifold configured to receive exhaust gas from the engine;

a reverse flow heat exchanger coupled to the first exhaust manifold, the reverse flow heat exchanger including a plate defining a plane and separating an exit chamber and an intake chamber, the intake chamber having an intake chamber inlet and an intake chamber outlet located at opposing ends to allow flow therethrough, the exit chamber having an exit chamber inlet and an exit chamber outlet, the intake chamber inlet in fluid communication with the first exhaust manifold and configured to receive exhaust gas from the first exhaust manifold, the intake chamber outlet configured to communicate exhaust gas to the exit chamber inlet and;

a vane within the first exhaust manifold disposed relative to the intake chamber inlet so as to reduce resistance to fluid flow near the intake chamber inlet.