Patent ID: 9163882
Filing Date: 2015-10-20
Classification: F28D,F28F

Abstract:
1. A double-wall heat exchanger comprising: a plurality of heat exchange plate pairs that are mounted to a faceplate fluid connectors attached to the faceplate through which first and second heat exchange fluids are distributed into dedicated fluid flow channels defined between adjacent plate pairs and out of the heat exchanger; each heat exchange plate pair forming a double-wall structure comprising two heat exchange plates that are separated by a leak space having a depth, the leak space extending across an entire chevron area of the plates and is fluidly isolated from the fluid flow channels; two weep holes that are disposed through the plurality of heat exchange plate pairs, each weep hole passing through each heat exchange plate and the faceplate at a location that is interior the outer circumferential boundary of each heat exchange plate and the faceplate, the two weep holes located adjacent opposite sides of the heat exchanger; two central vent pockets vertically extending between the heat exchange plates of each plate pair, each central vent pocket longitudinally extending between the chevron area and one of the weep holes, thus directly connection each chevron area with one of the weep holes, the leak spaces transitioning into the central vent pockets as follows: by vertically widening to a first constant depth and then maintaining the first constant depth for a first length, then by vertically widening to a second constant depth and then maintaining the second constant depth for a second length, the second depth being deeper than the first depth, the first depth being deeper than the depth of the leak spaces; a port vent groove that annularly surrounds each brazed port of every adjacent plate pair such that the port vent groove is located between said one of the plate pairs and an adjacent heat exchange plate pair; two port leak grooves defined between the heat exchange plates of each plate pair, each port lead groove being a straight fluid channel, each port leak groove intersects one of the central vent pockets at a single point and intersects one of the port vent grooves at a single point; each weep hole passing straight from the faceplate through one central vent pocket of each plate pair, in the plate pairs, the weep holes only intersecting the central vent pockets and the faceplate.