Heat exchange – Flow passages for two confined fluids – Interdigitated plural first and plural second fluid passages
Patent
1999-08-05
2000-12-19
Flanigan, Allen
Heat exchange
Flow passages for two confined fluids
Interdigitated plural first and plural second fluid passages
165 47, 165167, 165916, F28D 900
Patent
active
06161615&
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a plate heat exchanger, in particular an oil/coolant cooler for internal combustion engines, having the features of the preamble of claim 11.
A plate heat exchanger of the abovementioned type, known from DE 43 14 808, has, for closing off the plate heat exchanger sealingly, a closing plate on its heat exchanger plate which, in the mounted state, is adjacent to the connected body. This closing plate may additionally serve as a fastening element, for which purpose it is provided with bores which cooperate with bolts or screws as fastening means, in order to fasten the plate heat exchanger, for example, to an engine block. Alternatively, a fastening plate is proposed, which is designed according to individual requirements and, for example, is prepared for fastening to a special engine block. This fastening plate may be mounted on the plate heat exchanger in addition to the closing plate or be fastened, instead of the closing plate, to the heat exchanger plate adjacent to the connected body (for example, engine block), the fastening plate then also serving at the same time as closing plate.
EP 0 273 462 discloses a plate heat exchanger of the type described above, in which the peripheral collar of one heat exchanger plate rests against the peripheral collar of the adjacent heat exchanger plate or against the edge of the connecting plate and is sealingly connected, in particular soldered, thereto by assembly.
The fastening elements of this known plate heat exchanger comprise at least one passage which is formed from mutually aligned orifices in the heat exchanger plates and in the connecting plate. A fastening means designed as a tension rod can be led through the passage, in which case, in order to fasten the plate heat exchanger, the tension rod, at one end, rests externally, in the region of the passage, on the connecting plate and/or on the heat exchanger plate adjacent to the latter and, at the other end, is anchored in the body.
Each heat exchanger plate is sealed off, in the region of the aligned orifices, relative to the adjacent heat exchanger plate or relative to the adjacent connecting plate.
The aligned orifices of the heat exchanger plates are each provided with a peripheral collar, the peripheral collar of one orifice of a heat exchanger plate bearing against the peripheral collar of the adjacent orifice of the adjacent heat exchanger plate or against the edge of the adjacent orifice in the connecting plate and being sealingly connected, in particular soldered, thereto by assembly.
The invention is concerned with the problem that the known closing plate or fastening plate may experience deformation under the high pressures occurring in a plate heat exchanger of this kind, the oil cooler being lifted off from the connected body in the region of connection of the latter. This may result, on the one hand, in increased wear of the plate heat exchanger and, on the other hand, in reduced sealing off relative to the connected body.
This problem is solved by means of the plate heat exchanger according to the invention having the features of patent claim 11.
An embodiment having the features as claimed in claim 12 makes it possible to have a particularly simple connection, in particular a soldered connection, of the individual heat exchanger plates with one another, both on the peripheral collar of the heat exchanger plate and on the peripheral collar of the aligned orifices.
Other features and advantages essential to the invention may be gathered from the subclaims and from the following description of a preferred exemplary embodiment.
In the diagrammatic drawing:
FIG. 1 shows an exploded drawing of heat exchanger plates and turbulence inserts of a plate heat exchanger according to the invention, and
FIG. 2 shows a cross section through a plate heat exchanger according to the invention.
FIG. 1 shows, in an exploded illustration, a sectional view of eight heat exchanger plates 2 with turbulence inserts 3 and 3' located between them. Each heat exchanger plate 2 has a peripheral coll
REFERENCES:
patent: 5165468 (1992-11-01), Tajima et al.
patent: 5511612 (1996-04-01), Tajima et al.
Brieden Thomas
Layer Markus
Flanigan Allen
Knecht Filterwerke GmbH
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