Heat exchange – Radiator core type
Patent
1998-10-15
2000-01-25
Leo, Leonard
Heat exchange
Radiator core type
165167, 165906, F28D 103
Patent
active
06016865&
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention concerns a plate heat exchanger at which a plurality of plates are so arranged as to create plate interspaces between them for flowing through of two fluids; inlets and outlets for the mentioned fluids are so arranged that a first one of the fluids is led through every other plate interspace and a second one of the fluids is led through the rest of the plate interspaces in main directions of flow, which are in parallel with each other; each plate is provided with a press pattern which is such that the plate on its both sides shows ridges and valleys extending next to each other, which form an angle with the mentioned main directions of flow; ridges of the mentioned kind in a crossing manner bear on ridges of the same kind in those of the mentioned plate interspaces, which are created for flowing through of said mentioned first fluid; every other plate has, on that one of its sides, which is turned to a plate interspace created for flowing through of the mentioned second fluid, elevations created by pressing of the plate, which elevations are higher than those ridges that are on the same side of the plate; and the mentioned elevations at every other plate bear on the adjacent plate in the mentioned plate interspace, which is created for flowing through of the mentioned second fluid, in such a way that opposite ridges at the two plates are kept at a distance from each other. By the design of the plates in this manner the fact is achieved that the mentioned second fluid meets a considerably lower flow resistance than the mentioned first fluid at the flowing of the fluids through the plate heat exchanger.
BACKGROUND OF THE INVENTION
In GB-1,071,116 a plate heat exchanger of this kind is shown, at which special elevations are designed for keeping the plates at a distance from each other in every other plate interspace meant for flowing through of a gaseous fluid, which distance is larger than the distance between the plates in the rest of the plate interspaces aimed for the flowing through of a fluid in a liquid state. The special elevations are created on the tops of those ridges that are crossing each other in the plate interspaces for the gaseous fluid.
SUMMARY OF THE INVENTION
The object of this invention is to create a plate heat exchanger of the kind mentioned by way of introduction, at which heat exchanger the plates are designed so as to be utilized more effectively than what is the case with the known heat exchanger according to GB-1,071,116 for the desired heat transfer between the fluids.
This object can, according to the invention, be achieved by each one of the mentioned elevations on every other plate being elongated and extending, with its longitudinal axis, substantially in parallel with the mentioned main directions of flow, thereby bridging at the most two valleys between ridges extending next to each other, which ridges are created on the same side of the plate as the elevation in question.
By such an arrangement for the mentioned elevations these can be given any wanted height without any need to forego the present desire concerning the design of the ridges and valleys extending next to each other. Thus, it is desirable at--and by--the pressing of the mentioned ridges and valleys in a plate to create the largest possible area enlargement of the plate, so that the plate may be used to a maximum for the present heat transfer.
At a plate which is designed in accordance with GB-1,071,116 (the FIGS. 5 and 6) the largest possible area enlargement of the plate is decided by the local area enlargement that is created in the areas for the extra elevations on the top of the mentioned ridges. Thus if a maximum area enlargement is created in the areas for the extra elevations, this means that the ridges as for the rest are created with a somewhat smaller area enlargement than that one at a maximum for the plate.
At a plate designed in accordance with the invention the same maximum area enlargement can be achieved in the areas for the mentioned ridges as in th
REFERENCES:
patent: 2610835 (1952-09-01), Hytte
patent: 3931854 (1976-01-01), Ivanhnenko et al.
patent: 4911235 (1990-03-01), Andersson et al.
patent: 5050671 (1991-09-01), Fletcher
Alfa Laval AB
Leo Leonard
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