Heat exchange – Flow passages for two confined fluids – Interdigitated plural first and plural second fluid passages
Patent
1988-12-28
1991-01-29
Schwadron, Martin P.
Heat exchange
Flow passages for two confined fluids
Interdigitated plural first and plural second fluid passages
165166, F28F 308
Patent
active
049879553
DESCRIPTION:
BRIEF SUMMARY
The present invention refers to a plate heat exchanger comprising a package of heat exchange plates, each having a peripheral portion and inside of this a heat exchange portion and several port portions with throughflow ports, the heat exchange plates being permanently joined to adjacent heat exchange plates of the package both along their peripheral portions and at many places in their heat exchange portions in such manner that they leave flow passages between adjacent heat exchange plates, the ports of the plates being aligned and forming first inlet and outlet channels through the package for a first heat exchange medium, which communicate with every other flow passage between the heat exchange plates, and second inlet and outlet channels through the package for a second heat exchange medium, which communicate with remaining flow passages between the heat exchange plates, and along each of the inlet and outlet channels the port portions of adjacent heat exchange plates, which form a flow passage separated from the inlet and outlet channel, respectively, being permanently joined around the inlet and outlet channel between an outer line and an inner line located closer to the inlet and outlet channel respectively.
Plate heat exchangers of this kind are previously known, for example from US 3 240 268 and GB A 2 005 398. Because the heat exchange plates are permanently joined to each other neither separate gaskets not between the plates and or an outer frame to hold the plates together are required. Therefore, it is possible to produce plate heat exchangers of this kind relatively cheaply. The expression permanently joined quotation marks refers mainly to soldering but also for example welding or glueing.
An essential disadvantage with known permanently joined plate heat exchangers is that they are limited to certain pressures, which are considerably lower than those permitted in a plate heat exchanger provided with an outer frame to keep the heat exchange plates together. At a pressure which overloads a permanently joined plate heat exchanger a leakage will arise, and it has now shown that such leakage as a rule is located at the port portions and/or the peripheral portions of the heat exchange plates in connection with the inlet and outlet channels. The reason for this is probably that the plate heat exchanger in the port portions of the plates has relatively large projected areas without connecting joints between the heat exchange plates. The joints located closest to these portions
.known plate heat therefore risk overloading and tearing up. In exchangers these joints are located at a considerable distance from the edge of the inlet or the outlet channels and usually first at the peripheral portions of the plates, which as mentioned are joined to a peripheral sealing between the heat exchange plates. Said considerable distance of the known plate heat exchangers has been considered necessary to give sufficient space for a sealing ring, which must be placed in the area between the said outer and the said inner line at an end plate of the plate heat exchanger. Furthermore a margin is required in the area for said sealing ring since during pressing of the heat exchange portions of the heat exchange plates the usually round ports often are deformed so that they become slightly oval.
The object of the present invention is to eliminate the above mentioned disadvantages of the previously known permanently joined plate heat exchangers and to provide a plate heat exchanger of the initially described kind which allows a considerably higher pressure load than previously known plate heat exchangers of this kind.
This object is achieved by a plate heat exchanger of the initially described kind, which mainly is characterized in means arranged to keep the port portions of the heat exchange plates together along the inlet and outlet channels, said means being placed along each of the inlet and outlet channels in the plate interspaces communicating with said inlet and outlet channels, respectively, and in each such plate
REFERENCES:
patent: 3240268 (1966-03-01), Armes
patent: 4470455 (1984-09-01), Sacca
patent: 4781248 (1988-11-01), Pfeiffer
Andersson Jarl
Bergqvist Jan-Ove
Alfa-Laval Thermal AB
Flanigan Allen J.
Schwadron Martin P.
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