Patent ID: 9599413
Date: 2017-03-21
CPC Classifications: F02B,F28D,F28F,Y02T

Claim:
1. A heat exchanger comprising: at least one header box that has a plate; and at least one tube arranged approximately perpendicular to the plate engages a passage that projects out of the plate and surrounds a tube end, wherein the passage has a quasi-rectangular cross-section matched to an outer circumference of the tube, such that the passage has two narrow sides and two wide sides connected together by four corner regions, wherein a wall thickness of at least one corner region is reduced by tool forming such that the wall thickness of the at least one corner region is thinner than a wall thickness of one of the narrow sides and one of the wide sides of the passage that are connected thereto, and wherein the wall thickness of the at least one corner region and the wall thickness of the one of the narrow sides and the one of the wide sides of the passage are each measured as a distance from an interior surface of the passage to an exterior surface of the passage.