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Heat exchanger

a technology of heat exchanger and tube, which is applied in the direction of heat exchange apparatus safety devices, lighting and heating equipment, and stationary conduit assemblies, etc., can solve the problems of large temperature difference, easy damage to tubes, and damage to tubes, so as to reduce stress and reduce stress. the effect of the stress concentration on the edge portions of the tube in the tube width direction

Inactive Publication Date: 2007-01-18
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a heat exchanger with reduced stress concentration on edge portions of tubes and reduced stress in all area in the tube width direction. This is achieved by a tank with a tube joint part having a plurality of ribs and a deformation allowable portion that allows the tank to be deformed in the tube longitudinal direction. The tank also includes a wall portion bent from a periphery portion of the tube joint part. The ends of the ribs in the tube width direction are positioned outside of the ends of the tube inserting holes, without being connected to the wall portion. The tank has a plurality of approximately V-shaped cross-sections, in which the tube inserting hole and the rib are provided without a flat face therebetween. This design reduces stress concentration on edge portions of tubes and achieves a more uniform distribution of stress in the tube width direction.

Problems solved by technology

When the heat exchanger is used as a radiator for an automobile, the tubes may be damaged due to a generation of a thermal strain.
Especially in a winter season, the tubes may be easily damaged because a temperature difference between cooling water and air is large.
Moreover, the temperature difference may become large in a cross-flow heat exchanger, in which a longitudinal direction of the tubes corresponds to a shape of an aperture portion of a grill of the automobile, because one tube is easy to be cooled by air, while another tube is difficult to be cooled by the air.
However, the thermal strain cannot practically be absorbed in the flexible tank.
In contrast, in the heat exchanger disclosed in U.S. Pat. No. 6,988,544, the core plate is difficult to be deformed in the tube longitudinal direction, because the rigidity of the core plate is enhanced by the ribs.

Method used

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Examples

Experimental program
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first embodiment

(First Embodiment)

[0028] A heat exchanger in a first embodiment is used for a radiator for cooling an engine (water-cooled internal combustion engine). As shown in FIG. 1, the heat exchanger includes an approximately cuboid-shaped core portion 1 formed by alternately stacking a plurality of tubes 10 and a plurality of corrugate fins 11 along up-and-down direction in FIG. 1. The stacking direction of the tubes 10 and the corrugate fins 11 is defined as a tube stacking direction Y. The corrugate fins 11 are made of aluminum alloy, and made in a corrugated shape so as to promote a heat exchange between air and cooling water. The tubes 10 have passages therein for flowing the cooling water of the water-cooled internal combustion engine (not shown) mounted to an automobile, and are formed by welding or blazing after a board made of aluminum alloy is bent in a predetermined shape.

[0029] In this embodiment, the longitudinal direction of the tubes 10 is defined as a tube longitudinal direc...

second embodiment

(Second Embodiment)

[0049] The above-described embodiment is only an example for the heat exchanger of the present invention. It is to be noted that various changes and modifications will be become apparent to those skilled in the art.

[0050] As shown in FIGS. 7 and 8, the tube inserting holes 221 may be formed by a burring process. In the second embodiment, the other parts can be made similarly to the above-described first embodiment.

third embodiment

(Third Embodiment)

[0051] As shown in FIGS. 9 and 10, when the pitch between the tubes 10 adjacent to each other is small, the tube inserting hole 221 and the rib 223 may be connected without the base face 224. In this case, the tube inserting holes 221 are formed at tip ends of plural V-shaped grooves in cross-section, and the ribs 223 are formed at opposite tip ends of the plural V-shaped grooves in cross-section.

[0052] The core plate 20 has a plurality of approximately V-shaped cross-sections such that the strength of the core plate 20 is increased. The V-shaped parts can be blazed together to form the tube inserting holes 221 and the ribs 223, after being separately formed. In this case, the both ends of the V-shaped grooves in the tube width direction Z are connected to the flat face 226 smoothly in a curve. In the third embodiment, because the tube joint part 22 of the core plate 20 is formed in zigzag without a flat surface between the rib 223 and the tube inserting hole 221 ...

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Abstract

A heat exchanger includes a plurality of flat tubes stacked with each other, and a tank connected at an end of each tubes to communicate with the tubes. The tank includes a tube joint part having a plurality of tube inserting holes, and a plurality of ribs extending in a tube width direction on the tube joint part. The ends of the ribs are positioned outside of the ends of the tube inserting holes. The tube joint part has a deformation allowable portion at an outside of the ends of the ribs so as to allow the tube joint part to be deformed in a tube longitudinal direction. The tube joint part has a plurality of approximately V-shaped cross-sections, in which the tube inserting hole and the rib are provided without a flat face therebetween.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This application is based on Japanese Patent Application No. 2005-105815 filed on Apr. 1, 2005, the disclosure of which is incorporated herein by reference in its entirety. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a heat exchanger. For example, the heat exchanger can be suitably used as a radiator of a water-cooled internal combustion engine in which heat is exchanged between cooling water and air. [0004] 2. Description of Related Art [0005] U.S. Pat. No. 6,988,544 (corresponding to JP-A-2004-219044) discloses a heat exchanger including a core portion and a tank. In the core portion, a plurality of tubes and a plurality of corrugate fins are alternately stacked. The tank is disposed at the ends of the tubes in the longitudinal direction, and includes a core plate and a tank portion. The tubes are inserted into the core plate, and the tank portion is fixed to the core plate by ca...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F28F9/02
CPCF28D1/05366F28F9/0226F28F2265/26F28F21/08F28F21/062
Inventor SUGITO, HAJIMEOZAKI, TATSUO
Owner DENSO CORP