Stacked plate heat exchanger

a heat exchanger and stacked plate technology, applied in the direction of coatings, lighting and heating apparatus, laminated elements, etc., can solve the problems of oil coolers having leak holes on the plates, and it is difficult to braze such a support plate on the core, so as to achieve reliable joint brazing and sufficient corrosion resistance

Inactive Publication Date: 2009-02-05
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]In view of the foregoing problems, it is an object of the present invention to provide ...

Problems solved by technology

However, this oil cooler may have a leak hole on the plate due to corrosion by moisture or chlorine.
However, this oil cooler may also have a leak hole on the plate due to corrosion, since the brazing material layer on one of the first and second plates directly faces to the passage for coolant and causes corrosion.
Further, in case of...

Method used

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Examples

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first embodiment

[0028]A first embodiment of the invention is described below with the drawings. The first embodiment is an oil cooler also called as a housingless oil cooler for cooling oil lubricating an internal combustion engine mounted on a vehicle. The oil cooler is attached on a side wall of an engine cylinder block and performs heat exchange between oil and engine cooling water.

[0029]Referring to FIGS. 1 and 2, the oil cooler has a core 10 formed by stacking a plurality of plates for performing heat exchange between oil and cooling water. The core 10 has alternately stacked first plates 1 and second plates 2. The first plates 1 and second plates 2 are formed to have a predetermined shape having protrusions and depressions by pressing processes. The oil cooler has a cover plate 3 made of aluminum alloy, and attached on one end of the core 10. The oil cooler further has a support plate 4 made of aluminum alloy, and attached on the other end of the core 10. In FIG. 2, the core 10 has the cover ...

second embodiment

[0057]A second embodiment of the invention is described below with the drawings. Referring to FIG. 7, the same or corresponding structures are indicated by the same reference numbers as described in the first embodiment. In this embodiment, a first plate 201 has a first tapered portion 244 apparently longer than that of the second plate 202 and that of the first plate 1 in the first embodiment. The first tapered portion 244 is higher formed from the partitioning portion 41 than the second tapered portion 254. The first plate 201 has a folded portion 245 having a distal end that does not reach the boundary between the partitioning portion 51 and the tapered portion 244. As a result, the folded portion 245 only covers an outer end region of the lateral outside surface of the tapered portion 244. The first plate 201 and the second plate 202 are stacked so that the first sacrificial layer 32 comes in contact with the second brazing material layer 35, and that the first brazing material ...

third embodiment

[0058]A third embodiment of the invention is described below with the drawings. Referring to FIG. 8, the same or corresponding structures are indicated by the same reference numbers as described in the first embodiment. In this embodiment, a first plate 301 has a first tapered portion 344 apparently longer than that of the second plate 302 and that of the first plate 1 in the first embodiment. The first tapered portion 344 is higher formed from the partitioning portion 41 than the second tapered portion 354. The first plate 301 has a folded portion 345 having a distal end that does not reach the boundary between the partitioning portion 51 and the tapered portion 344. As a result, the folded portion 345 only covers an outer end region of the lateral outside surface of the tapered portion 344. The folded portion 345 is much longer than the folded portion 355. The first plate 301 and the second plate 302 are stacked alternately. The first sacrificial layer 32 is brazed with the second...

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Abstract

The stacked plate oil cooler has a first plate and a second plate. Both the first plate and the second plate are made of a three-layered aluminum alloy clad sheet. The second plate is folded at an outer rim to place the brazing material layer on both sides of the second plate. The first and second plates and are stacked alternately and brazed to define a water passage between sacrificial layers and, and to define an oil passage between brazing material layers. The first plate is folded at an outer rim to place the sacrificial layer on a lateral outside of a core assembly to decrease exposure of the brazing material layer to the lateral outside.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is based on Japanese Patent Application No. 2007-202024 filed on Aug. 2, 2007, the contents of which are incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]The present invention relates to a stacked plate heat exchanger, and is preferably applied to an oil cooler for an internal combustion engine used for an automobile.BACKGROUND OF THE INVENTION[0003]Conventionally, the stacked plate heat exchanger such as an oil cooler is known in this field, also called as a housingless oil cooler. This type of oil cooler has a plurality of plates, typically made of metal such as aluminum or aluminum alloy. The plates include a first plate and a second plate formed in different shapes. The first and second plates are alternately stacked to define a plurality of passages therebetween. The passages include a first passage for coolant, such as cooling water and a second passage for hot medium, such as oil to be co...

Claims

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Application Information

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IPC IPC(8): F28F3/00
CPCF28F19/06F28D9/005F28F21/089
Inventor KOMODA, SHUJIINAGAKI, RYUICHIROKAMIYA, SADAYUKIITO, YUUJI
Owner DENSO CORP
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