Heat exchanger
AssigneeDenso Corporation
InventorsTatsuo Ozaki, Toshihide Ninagawa
Life of this patent
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Abstract
A heat exchanger with the ends of tubes (10) connected by being inserted into a tank (2) is disclosed. Insertion holes are formed in a protrusion (210) convex outward of the tank (2) along the tube length (X). The junction length ratio B/A is not less than 1.15, where A is the outer peripheral surface length of the tubes (10) and B the peripheral length of the junction between the tubes (10) and the tank (2). The larger the junction length ratio, the more the stress generated in the tubes (10) is distributed and reduced. Especially in the case where the junction length ratio is not less than 1.15, the stress is reduced by one half as compared with the junction length ratio of 1.0.
Claims6
A heat exchanger comprising:
- a stack of a multiplicity of flat tubes;
- and
- a pair of tanks arranged at the ends along the length (X) of the tubes and communicating with the tubes;
- wherein the ends along the length (X) of the tubes are inserted into the insertion holes of the tanks;
- wherein the insertion holes are formed at a protruded portion convex outward of the tanks along the tube length (X);
- and
- wherein the junction length ratio B/A between the outer peripheral length A of the tubes and the peripheral length B of the junction between the tubes and the tanks is not less than 1.15.
Dependencies are inferred from the claim text.