Heat exchanger in particular for motor vehicles
AssigneeSueddeutsche Kuehlerfabrik Julius Fr. Behr GmbH & Co. KG
InventorsJuergen Bayer, Reinhold Heck, Karl-Ernst Hummel, Reinhold Kuchelmeister
Life of this patent
Estimating the term…
Abstract
Heat exchanger having a tube plate made of plastic, in which metallic tubes are fixed. The tube plate has elevations having openings for accommodating the tube ends, with the openings being subdivided into three sections in axial extension. The center section has the smallest cross-section and the end sections are in each case widened. The elevations extend on both sides of the tube plate, the total height of the elevations located in the area of an opening, inclusive of the tube plate thickness, being about 1.8 to 2.5 times the single tube plate thickness.
Claims19
A heat exchanger, comprising:
- a tube plate of plastic material;
- a first plurality of integral elevations disposed on one of an upper and a lower surface of said tube plate;
- a second plurality of integral elevations disposed on the other of said upper and lower surfaces of said tube plate, the height of said second elevation from said other surface being less than or equal to twice the height of said first elevation from said one surface;
- a plurality of openings extending through said first and second elevations and said tube plate, said openings having outwardly tapered end sections;
- and
- a plurality of metal heat exchanger tubes expanded in said openings to secure the tubes in said openings,
- wherein the total height of said first and second elevations and said tube plate is between approximately 1.8 and 2.5 times the normal thickness of said tube plate between said upper and lower surfaces;
- and
- wherein a central axial extent of said opening between said outwardly tapered end sections is between approximately 1 and 2 times the normal thickness of said tube plate.
A heat exchanger comprising:
- a tube plate of plastic material;
- at least one opening extending through said tube plate;
- first means disposed on an upper surface of said tube plate and comprising a section of said at least one opening tapering outwardly toward an upper open end thereof for distributing a substantially uniform increase in compressive stress across a first axially extending end section of said at least one opening;
- second means for distributing a substantially constant compressive stress across a second axially extending mid-section of said at least one opening;
- third means disposed on a lower surface of said tube plate and comprising a section of said at least one opening tapering outwardly toward a lower open end thereof for distributing a substantially uniform decrease in compressive stress across a third axially extending end section of said at least one opening and at least one metal heat exchange tube expanded in said at least one opening to secure the tube therein.
Dependencies are inferred from the claim text.