Exhaust gas heat transfer device

Patent metadata

Field	Value
Publication number	US-9927183-B2
Application number	US-201514662223-A
Country	US
Kind code	B2
Filing date	Mar 18, 2015
Priority date	Mar 18, 2015
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

The invention relates to an exhaust gas heat exchanger ( 1 ) with a housing ( 2 ), in which a tube bundle ( 3 ) with multiple tubes ( 4 ) is held via headers ( 5, 6 ), wherein in the tubes ( 4 ) a first flow path for exhaust gas ( 7 ) and between the tubes ( 4 ) and the housing ( 2 ) a second flow path for coolant ( 8 ) runs, wherein the first longitudinal ends of the individual tubes ( 4 ) of the tube bundle ( 3 ) are incorporated in a first header ( 5 ) in a fixed manner, in particular welded or brazed. It is substantial to the invention that at least one of the tubes ( 4 ) is axially moveable in the region of a second longitudinal end relative to the second header ( 6 ) and captive therein.

First claim

The invention claimed is:

1. An exhaust gas heat exchanger comprising a housing, in which a tube bundle with at least two tubes is held via a first header, a second header, and a third header, wherein a first flow path for exhaust gas runs in the tubes and a second flow path for coolant runs between the tubes and the housing and wherein the first longitudinal ends of the individual tubes of the tube bundle are incorporated in the first header in a fixed manner,
wherein at least one of the tubes is axially moveable relative to the second header and captive therein, and
wherein a second longitudinal end of at least one of the tubes is fixed to the third header;
wherein the individual tubes with their second longitudinal ends are incorporated in apertures in a fixed manner, wherein the tubes between the second header and the third header comprise a bellows for compensating longitudinal expansions.

2. The exhaust gas heat exchanger according to claim 1 , wherein at least one tube is held captive in an aperture of the second header by means of a clearance fit, transition fit or by means of a press fit.

3. The exhaust gas heat exchanger according to claim 1 , wherein all tubes are held axially moveable in the region of their second longitudinal end in the second header.

Assignees

• Mahle Int Gmbh

Inventors

• Pantow Eberhard
• Bauer Martin
• Geskes Peter

Classifications

• F28D7/16

  the conduits being arranged in parallel spaced relation ({F28D7/0008 - F28D7/0058 take precedence}; F28D7/02 - F28D7/10 take precedence) · CPC title

• F28F9/0236 Primary

  floating elements · CPC title

• F28D7/0066 Primary

  Multi-circuit heat-exchangers, e.g. integrating different heat exchange sections in the same unit or heat-exchangers for more than two fluids (F28D7/103 takes precedence) · CPC title