Patent ID: 6269870
Filing Date: 2001-08-07
Classification: F01N,F02M,F28D,F28F,Y02T

Abstract:
An exhaust heat exchanger, comprising:tubes held in tube sheets at both ends for guiding a gaseous medium and defining a tube bundle,a housing adjoining the tube sheets and surrounding the tubes for guiding a liquid coolant, the tube sheets, the tubes, and the housing being made from heat-resistant austenitic steel sheet, the tubes being welded into the tube sheets, and the housing being welded to the tube sheets, the tube sheets being deep-drawn stamped parts,a circumferential wall included in each of said stamped parts that projects outward beyond ends of the tubes of the tube bundle, anda diffuser abutted by each circumferential wall, each circumferential wall being welded to said housing,wherein said housing and said tube sheets are cut to length in the vicinity of the circumferential walls following production of the welded connections,wherein said housing and said tube sheets are welded together by a circumferential auxiliary seam and by a sealing seam applied closer to the ends of the tubes, andwherein the housing and the tube sheets are cut to length in the vicinity of the auxiliary seam.