Tube for heat exchange
AssigneeBorgwarner Emissions Systems Spain, S.L.U.
InventorsFélix LÓPEZ FERREIRO, Lidia María FONTÁN MARTINEZ, Gerardo LAREU, Antonio DEL CUETO
Life of this patent
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Abstract
The present invention relates to a device for heat exchange between a hot gas and a liquid coolant. The tube has a flat configuration, with intermediate channels formed by a set of fins and two lateral channels with a larger hydraulic diameter. The invention is characterized by a specific way of reducing the passage section in order to prevent a by-pass effect in the tube so that gas flow is directed mainly through the set of fins.
Claims10
Tube (1) adapted for heat exchange between a hot gas and a liquid coolant wherein:
- the tube (1) has a flat configuration, configured by means of two essentially parallel flat walls (1.1) extending along a longitudinal direction (X-X′) and joined on both sides by means of a curved wall segment (1.2);
- the tube (1) comprises a set of fins (1.3) housed inside the tube (1) extending from the inner surface of one flat wall (1.1) to the inner surface of the other flat wall (1.1);
- the set of fins (1.3) comprises a plurality of internal channels (C) and a lateral channel (Cl) on each side, the lateral channel (Cl) being the one formed between the group of fins (1.3) and the curved wall segment (1.2);
- the hydraulic diameter (Dh) of the lateral channels (Cl) is larger than the hydraulic diameter (Dh) of the internal channels, wherein the hydraulic diameter is Dh=4 A/p, where A is the cross-section area of the channel and p is the perimeter of said cross-section, and
- wherein at least one curved wall segment (1.2) comprises a deformed portion (1.2.1), with a configuration of the deformed portion (1.2.1) penetrating into the lateral channel (Cl) reducing the section thereof.
Method of manufacturing a tube (1) comprising the following steps:
- a) providing a tube (1) having a flat configuration, configured by means of two essentially parallel flat walls (1.1) extending along a longitudinal direction (X-X′) and joined on both sides by means of a curved wall segment (1.2);
- b) inserting into the tube (1) a set of fins (1.3) leaving a lateral channel (Cl) between the set of fins (1.3) and each curved wall segment (1.2);
- c) pressing the curved wall segment (1.2) in a region of its outer surface causing a deformed portion (1.2.1) which narrows the section of the lateral channel (Cl);
- d) attaching the set of fins (1.3) to the tube (1), preferably by brazing.
Dependencies are inferred from the claim text.