Heat exchange – Flow passages for two confined fluids – Interdigitated plural first and plural second fluid passages
Patent
1993-06-09
1996-02-20
Leo, Leonard R.
Heat exchange
Flow passages for two confined fluids
Interdigitated plural first and plural second fluid passages
165144, F28F 926
Patent
active
054921716
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a plate heat exchanger for heat exchange between two pressurized fluids, comprising a plate package having two end plates and several thin heat transferring plates arranged therebetween, each of the heat transferring plates having a heat transferring portion provided with spacing means for creation of flow passages between adjacent plates and an edge portion extending therearound, the heat transferring plates further having through ports situated aligned with each other for the forming of four port channels extending through the plate package, two of which port channels communicate only with the flow passages in every second plate interspace, one on each side of the heat transferring portions of the heat transferring plates, and the two other port channels communicate only with the flow passages in the other plate interspaces, one on each side of said heat transferring portions, the end plates and the heat transferring plates being permanently united with adjacent heat transferring plates both along the edge portions of the latter and at several places distributed across their heat transferring portions in a way such that the plate package is thereby kept together against the action of the pressures exerted by the pressurized fluids on the heat transferring plates in the plate interspaces, and at least one of the end plates having openings, which are arranged for through flow of said two fluids and each of which communicates with one port channel. By "end plate" is meant in this connection just a plate situated at one end of the plate package. An end plate can be either as thin as a heat transferring plate or, if considered suitable, be thicker than such a plate. By the expression "permanently united" it is meant here such a connection between the plates in the plate package that the plates should not easily be separable without being destroyed, and that the plates by their mutual connection can take up the pressures of the two heat exchanging fluids in the plate interspaces without requiring a frame or the like to keep the plate package together against the action of these pressures.
A plate heat exchanger of the above-defined kind is f described in WO 88/09473. A plate heat exchanger of this kind is characterized in that it has no frame or other strong means for compressing and keeping together the plates in the plate package. Thus, no such means are required for compressing sealing edge gaskets between the plates, since the permanent connection of the heat transferring plates along their edges serves as edge sealing means between the plates. Further, means for keeping the plates together during operation of the plate heat exchanger are not required since, as mentioned above, the permanent connection between the heat transferring portions of the plates is of a kind such that the heat transferring plates themselves will take up the pressure forces caused by the heat exchanging fluids.
A particular type of plate heat exchangers, having permanently united plates, is constituted by so called brazed plate heat exchangers. These have often rather small heat transferring plates, e.g. 30 cm.times.10 cm or 60 cm.times.20 cm, and are produced in a way such that a plate package comprising two end plates and a number of heat transferring plates arranged therebetween inserted into a furnace, in which all the plates are brazed together simultaneously.
A producer of brazed plate heat exchangers produces, in practice, for each plate size a certain number of plate package sizes, i.e. plate packages comprising different numbers of heat transferring plates. Standard size brazed plate packages of this kind may be produced cheaply and in long series. Each plate package has inlets and outlets for two heat exchanging fluids, and usually the plate package is provided with special connecting members at said inlets and outlets already in connection with the brazing operation. The connecting members are brazed either all to one and the same end plate or two to one end plate, for one heat exchange f
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Alfa Laval Thermal AB
Hoxie Davis
Leo Leonard R.
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