Abstract: A heat exchanger and method of making same is disclosed. The heat exchanger is particularly useful for cooling automotive engine oil or transmission fluid, the exchanger being located inside the radiator or other part of the engine cooling system. The heat exchanger is made from a plurality of stacked plates formed of cladded metal, the plates being assembled into face-to-face pairs, each pair having a turbulizer located therein. The plates also have outwardly disposed dimples which are in contact when the plates are arranged back-to-back. The turbulizer is thicker than the spacing between the assembled plates prior to brazing the assembly. The dimples maintain good contact between all heat transfer surfaces while the assembly is completed by brazing.

Abstract: The invention relates to an improved energy exchange structure, comprising generally parallel plates,connected to define a hollow passageway for the generally circumferential flow of fluid between an inlet and an outlet, said plates undulating in cross-section to define obliquely disposed crossing opposing valleys arranged in a spiral disposition.

Abstract: The invention relates to an improved energy exchange structure, comprising generally parallel plates, joined to define a hollow passageway for the generally circular flow of fluid between an inlet and an outlet, said plates undulating in cross-structure to define obliquely disposed crossing opposing valleys, and comprising multiple sets of generally parallel valleys and an involute disposition of said valleys.

Abstract: An improvement in circumferential flow heat exchangers of the type having a stack of heat exchange units each formed from first and second thin plates having grooves and ribs, wherein the grooves and ribs on facing surfaces of the first and second plates of a unit cross one another and cooperate to define a first flow path extending once about the interior of such unit through less than about one circumscription and grooves and ribs on facing surfaces of first and second plates of adjacent units cross one another and cooperate to define a second flow path, characterized in that the first and second plates of each unit are configured to provide the second flow path with a cross-sectional area exceeding the cross-sectional area of the first flow path.

Abstract: A fluid sensor for heat exchanger system includes a supporting device such as a tubular hose fitting for mounting the sensor in the system so that heat exchanging fluid circulated in the system comes into contact with the sensor. A window or sight glass is mounted in the supporting device along with corrodible separating means interposed between the sight glass and the heat exchanging fluid. A visual indicator such as a movable flap or a colored ball can be viewed through the sight glass when the separating means is ruptured or broken by corrosion. The viewing of the indicator provides an indication that the heat exchanging fluid has reached a certain corrosive state and requires replacement or treatment. In a preferred embodiment, the separating means is a metal diaphragm spaced from the sight glass.

Abstract: An offset strip fin for use in compact automotive heat exchangers is disclosed. The offset strip fin has multiple transverse rows of corrugations extending in the axial direction wherein the corrugations in adjacent rows overlap in order that the oil boundary layer is continually re-started. The fin dimensions have been optimized in order to achieve superior ratio of heat transfer to pressure drop along the axial direction. In one aspect, an compact concentric tube heat exchanger has an offset strip fin located in an annular fluid flow passageway located between a pair of concentric tubes. The preferred range of lanced lengths is determined to be between 0.035" to 0.075" for periodically developed flow. Maintaining the lanced length in the regime of periodically developed flow is advantageous in that it gives a higher heat transfer coefficient than is achievable with fully developed flow.

Abstract: A plate and fin type heat exchanger is disclosed for cooling automotive engine oil, transmission fluid and power steering fluid. The heat exchanger is formed of a plurality of stacked plate pairs with louvered fins located therebetween. The plate pairs are formed of two elongate identical plates located face-to-face and having planar central portions, raised co-planar peripheral edge portions joined together, and co-planar end bosses with openings therein to form flow headers when the plate pairs are stacked together. The planar central portions have a plurality of uniformly spaced-apart, on-overlapping blunt projections joined together along a common plane with the peripheral edge portions. The projections are symmetrical and provide uniform flow through the plate pairs.

Abstract: A filter device for an engine coolant includes a housing with an inlet for inflow of coolant and an outlet air outflow; a flow path extends between the inlet and outlet, a filter in the flow path filters the coolant; a dosage of corrosion inhibitor is disposed in the housing, corrosion inhibitor being separated from the flow path by a separating means exposed to coolant in the flow path; the separating means disintegrates by corrosion when coolant in the flow path has a corrosiveness above a predetermined level thereby releasing the dosage of corrosion inhibitor into the coolant.

Abstract: A filter device for an engine coolant includes a housing with an inlet for inflow of coolant and an outlet for outflow; a flow path extends between the inlet and outlet, a filter in the flow path filters the coolant; a dosage of corrosion inhibitor is disposed in the housing, corrosion inibitor being separated from the flow path by a separating means exposed to coolant in the flow path; the separating means disintegrates by corrosion when coolant in the flow path has a corrosiveness above a predetermined level thereby releasing the dosage of corrosion inhibitor into the coolant.

Abstract: A heat exchanger core assembly having an improved tube-to-header joint construction wherein each individual tube end portion is preformed into a diamond-shaped configuration and each mating header plate is likewise preformed to include a plurality of diamond-shaped openings adaptable for receiving the corresponding diamond-shaped tube ends therethrough. Each tube member includes a body portion, a diamond-shaped end portion located at each opposite end thereof, and a gradual transition section which extends from each opposite end of the tube body portion to the respective diamond-shaped tube end portions. When mated together, each tube-to-header joint is bonded together such as by soldering or brazing. Each of the diamond-shaped openings in the mating header plates may also include an increased flange area extending at least partially therearound to improve the structural integrity and strength of the soldered or brazed joint between the tube end portions and the mating header plates.

Abstract: A solid anhydrous composition comprising a surface layer formed of a caustic compound and a second layer formed of a corrosion inhibiting compound for use in a corrodible container in a device for the automatic addition of corrosion inhibitors to coolant systems. Where corrosive water is present in the coolant system in contact with the corrodible portion of the container, perforation of the corrodible portion allows penetration of coolant into the container, forming a highly corrosive alkaline solution in the area of perforation, quickly destroying the remaining corrodible portion and allowing rapid disolution and dispersion of the solid corrosion inhibitor.