Heat exchange – Flow passages for two confined fluids – Interdigitated plural first and plural second fluid passages
Patent
1992-08-05
1994-05-03
Rivell, John
Heat exchange
Flow passages for two confined fluids
Interdigitated plural first and plural second fluid passages
165153, F28F 308
Patent
active
053078691
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a plate heat exchanger for transferring heat from one fluid to another, comprising a stack of plate elements, which are held together by holding members extending across the planes of the plate elements and each of which plate elements comprises two heat exchange plates having opposite heat exchange portions and port portions, respectively, which latter have aligned through-flow openings, the heat exchange plates in each plate element further being permanently joined together, e.g. by brazing, both around their edges and at several plates distributed over the heat exchange portions, and each heat exchange plate having protuberances and depressions formed by pressing in its heat exchange portion, two adjacent plate elements abutting closely against each other via the heat exchange portions of the respective heat exchange plates, so that heat transfer between the heat exchange plates is facilitated but a possible hole through one of them would allow outflow of fluid between the plate elements.
A plate heat exchanger of this kind is known by U.S. Pat. No. 4,249,597. In this known plate heat exchanger each heat exchange plate has only two through-flow openings, and each plate element is formed by two such heat exchange plates, one of which is turned 180.degree. relative to the other around an axis in the plane of the plate. Two adjacent plate elements of this kind abut against each other only over the heat exchange portions of the heat exchange plates, one plate element being turned 180.degree. around an axis perpendicular to the plate plane relative to the other plate elements, so that the port portions of one plate element are turned in one direction and the port portions of the other plate element are turned in the opposite direction.
The known plate heat exchanger further has two stiff end plates, which abut against the heat exchange portions of the respective outermost heat exchange plates and are connected with each other by means of two members holding them together and having the form of rods extending outside the stack of plate elements.
One drawback with the known plate heat exchanger is that its design presume heat exchange plates of a particular kind, i.e. heat exchange plates which can be used only in a double-wall arrangement according to U.S. Pat. No. 4,249,597.
Another drawback is that the heat exchange plates have to be oriented in several different ways relative to each other in connection with assembling of the plate heat exchanger.
A third drawback is that the rods holding the stack of plate elements together are not used to hold together certain joints between the different plate elements, which during operation of the heat exchanger will be subjected to particularly large forces acting to separate the plate elements from each other.
One object of the present invention is to provide a design for permanently joined plate heat exchangers of the initially defined kind, in which the treated fluids are kept separate by means of double heat exchange plates, which design makes possible cheaper and more simple production of such plate heat exchangers than the design which can be seen from U.S. Pat. No. 4,249,597.
Another object is to provide a plate heat exchanger of the said kind, which can be subjected to higher pressures from the heat exchange fluids in question than a plate heat exchanger according to U.S. Pat. No. 4,249,597.
These objects can be achieved by a design which is characterized in that each heat exchange plate has at least four port portions with through-flow openings, that the heat exchange plates in each plate element abut against each other and are permanently and fluid-sealingly connected with each other along a line surrounding the heat exchange portion of each heat exchange plate and at least two of its through-flow openings and, also, around each of the two other through-flow openings of each heat exchange plate, that adjacent plate elements abut against each other via the port portions of the respective heat exchange plates and are permanent
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Alfa-Laval Thermal AB
Leo L. R.
Rivell John
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