Abstract: A cross flow heat exchanger for heat exchange between two fluids. The heat exchanger is of the type having a stack of spaced, parallel rectangular plates; a frame enclosing the plates and having generally rectangular end walls parallel to the plates and corner posts extending between corners of the end walls; and corner supports extending between the end walls and sealingly engaging respective aligned plate corners. The heat exchanger is characterized by including a plurality of leaf springs, each having a plurality of nested but individually resilient leaves elongated parallel to the corner posts and having a generally arcuate transverse cross-section providing spaced surfaces bearing respectively against a corner post and a corner support to resiliently seal the corner post to the corner support.

Abstract: A heat exchanger plate block is comprised of a stack of consecutive, spaced, parallel rectangular plates mounted within an enclosing frame. The frame has end walls parallel to the plates and corner posts extending between and joining corners of the end walls. Resilient spacers are included between the plates to render the stack of plates elastically compressible as a unit in a direction normal to the planes of the plates. Resilient corner spacers are provided to space corners of the plates from adjacent corner posts to accommodate growth of the plates due to thermal expansion in their planes. The plates of the plate stack hence float within resilient fixtures which accommodate thermal expansion parallel to and normal to the planes of the plates.