Abstract: A heat exchanger core having a plurality of spaced fluid conducting tubes operatively connected in series at their upper ends by projecting tank portions. The tubes have flattened main body portions that extend downward from the tank portions to terminal ends having rows of integral spacing and locking links formed with snap fasteners for releasably locking onto one another to connect the lower end of the tubes to one another providing column strength thereby preventing damage to corrugated metal air centers disposed between adjacent tubes by compression forces exerted on the core. In addition to the spacing and locking links, this core features integral snap fasteners to lock the separate plates of each tube together in face to face relationship so that the entire core is mechanically connected and interlocked and is ready for permanent connection by brazing.

Abstract: An evaporator for an automotive air conditioner having a plurality of tubes arranged side by side so that the tubes form spaces for air centers and channel heated air past the sidewalls of the tubes. Each tube has a divider rib to define liquid and vapor passages for the flow of refrigerant around the end the rib in a general U-shaped flow. The ribs have spaced bypass openings therein so that each rib is able to allow the leakage of liquid refrigerant across the rib from the liquid to the vapor side to eliminate dry out areas and thereby increase heat exchanger efficiency.

Abstract: An oil cooler center has a sinusoidally shaped plate with a center length which extends across the width of a longitudinal flow path through an oil cooler and with a center pitch formed between a pair of inclined walls that form a plurality of spaced oil chambers in the oil cooler having oil flow diverted therethrough by louvers formed in the walls to form inlets and outlets to and from the spaced oil chambers and wherein the louvers are inclined to mix the oil up and down in a plane perpendicular to the longitudinal flow path so as to break up a thermal boundary layer on the inner surface of the outside walls of an oil cooler.