Heat exchange – Flow passages for two confined fluids – Interdigitated plural first and plural second fluid passages
Reexamination Certificate
1999-05-10
2001-04-17
Atkinson, Christopher (Department: 3743)
Heat exchange
Flow passages for two confined fluids
Interdigitated plural first and plural second fluid passages
C165S166000, C165S096000, C165S135000, C165S916000
Reexamination Certificate
active
06216775
ABSTRACT:
The present invention relates to an arrangement in a heat exchanger having alternating cooling water ducts and water ducts.
Conventional heat exchangers in the form of retarder oil coolers are usually constructed from plates with alternating cooling water and oil ducts between them. The cooling water, which remains at an essentially lower temperature than the oil to be cooled, flows in the outermost ducts. The said ducts adjoin the first oil ducts on the one side and the surroundings on the other. This means that relatively large temperature differences will occur between their two sides, which gives rise to thermal stresses. These stresses arise in particular at the commonly occurring, converging inward bends which are made on the plates surrounding the outermost cooling water ducts in order keep the said plates at a distance from one another. Owing to thermal fatigue the said inward bends may rupture and leakage occur, which can cause the heat exchanger to fail.
An object of the present invention is to produce an arrangement in a heat exchanger, for example a retarder oil cooler of the aforementioned type, by means of which the above-mentioned disadvantages are eliminated.
The arrangement according to the invention in a heat exchanger has several advantages. By means of this, a better thermal equilibrium is achieved in the outermost ducts, thereby reducing the risk of thermal fatigue. The service life of the heat exchanger is also thereby prolonged.
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Atkinson Christopher
Merchant & Gould P.C.
Valeo Engine Cooling AB
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