Heat exchange – Flow passages for two confined fluids – Interdigitated plural first and plural second fluid passages
Patent
1993-12-13
1995-03-21
Schwadron, Martin P.
Heat exchange
Flow passages for two confined fluids
Interdigitated plural first and plural second fluid passages
165167, F28F 304
Patent
active
053987519
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a plate heat exchanger comprising several heat transfer plates, each of which has at least one heat transfer portion which has in part parallel ridges upwardly pressed to a specific distance from a plane parallel to the plate and at an angle against these downwards pressed parallel grooves, and in part intermediate plate portions, which are provided with protrusions and depressions, located at a distance from said plane less than said specific distance, the ridges on one side of a plate as well as the ridges on the other side of the plate, which latter ridges are formed by the grooves, together with the intermediate plate portions form passages, each of which intersects passages formed on the opposite side of the plate, and the ridges and the grooves are so arranged in two plates assembled adjacent each other in the plate heat exchanger that ridges on one of the plates abut against ridges running parallel therewith on the other plate.
Through GB 1357282 it is previously known to provide a heat transfer plate with a corrugation pattern of ridges running adjacent to each other, pressed upwardly from a plane parallel with the plate, and at an angle to these ridges, grooves running adjacent each other pressed downwardly from said plane. Ridges and grooves are thus formed on both sides of the plate, and the ridges together with intermediate plate portions form passages for heat transfer media. These passages extend in different directions on each side of the plate and when two plates are mounted adjacent each other the ridges on the one plate abut along the whole of the plate length against ridges running parallel with the ridges of the other plate.
It is also known from the above mentioned patent that the surfaces between the ridges and the grooves can be made more rigid by having bulges in one or the other direction or by being provided with irregularities. This has been used with heat transfer plates in which the plate portions between parallel ridges and parallel grooves have been relatively large, and the surfaces have been provided with a corrugation pattern in shape of parallel ridges and grooves pressed less deeply than the rest of the corrugation pattern of the plate. Also dot-shaped protrusions have been used to attain a contraction of either of the passages, so that the flow resistance has become larger for the heat transfer media flowing through the passage. An increased flow resistance leads to an improved heat transfer. Such protrusions have been located between two parallel ridges, but often the protrusions have not been given sufficient width to attain a thermally efficient contraction, since the ridges which are directed in the same direction as the protrusions in such case should have been weakened.
Hitherto it has thus been difficult to attain thermally efficient protrusions of the above described kind. This applies mainly to plates which have a small distance between the parallel ridges and to plates which have a small pressing depth. As the area between two ridges is located in an intermediate plane only half of the pressing depth can be utilized to obtain the protrusions. For plates with a small pressing depth it will then be difficult to attain a sufficiently well defined corrugation pattern, and shaping of the plates in a previously known manner will lead to a mechanical weakening of the corrugation pattern of the plates.
The object of the present invention is to attain an increased flow resistance for both of the heat transfer media in a plate heat exchanger of the kind described and to mechanically strengthen the corrugation pattern of the heat transfer plates of the plate heat exchanger.
These objects are achieved according to the invention with a plate heat exchanger of the above described kind which is characterized in that at least one of said intermediate plate portions, located between two parallel ridges and two parallel grooves, is provided with only two protrusions connected to each of said two grooves and only two depressions connected to each
REFERENCES:
patent: 2940736 (1960-06-01), Odman
patent: 3783090 (1974-01-01), Andersson et al.
patent: 4781248 (1988-11-01), Pfeiffer
patent: 4915165 (1990-04-01), Dahlgren et al.
patent: 4966227 (1990-10-01), Andersson
Leo L. R.
Schwadron Martin P.
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