Heat exchange – Flow passages for two confined fluids – Interdigitated plural first and plural second fluid passages
Patent
1996-11-07
1998-03-03
Flanigan, Allen J.
Heat exchange
Flow passages for two confined fluids
Interdigitated plural first and plural second fluid passages
165DIG371, F28D 900, F28F 310
Patent
active
057224862
DESCRIPTION:
BRIEF SUMMARY
The present invention refers to a plate heat exchanger for heat transfer between two fluids, comprising several permanently joined modules, each consisting of two outer heat transfer plates and between these several principally rectangular inner heat transfer plates, which have inlet and outlet openings for respective fluids in their corner portions.
Permanently joined plate heat exchangers are known for instance by GB 0580368 and GB 2126703. These may be produced in shape of all-welded plate heat exchangers in such a way that the heat transfer plates first are welded together in pairs along an inner line and then two such pairs of plates are welded together along an outer line. An all-welded plate heat exchanger may also be produced in such a way that several heat transfer plates are welded together simultaneously. However, the size of the plate heat exchanger becomes limited to the number of heat transfer plates, which presently may be welded simultaneously.
Previously known all-welded plate heat exchangers cannot be taken apart if a leakage arises, instead the whole of the plate heat exchanger must be discarded in case of a possible defect.
As an alternative to an all-welded plate heat exchanger, modules composed of 10-20 heat transfer plates, may be welded together. After testing the modules, they are assembled to a complete plate heat exchanger by means of intermediate gaskets, which admit that the modules may be dismantled from each other and replaced with new in case of a possible defect. Such plate heat exchangers are previously known through SE 304 293 and WO 92/11501. The disadvantage with these is that the intermediate gaskets limit the applicability of the plate heat exchangers.
The objects with the present invention are to avoid the disadvantages and limitation existing in plate heat exchangers of the above mention kind and to make a safe joining of modules possible, simultaneously as the modules may be taken apart from each other and replaced with new in case of a possible leakage or another defect.
These objects are attained with the present invention, which principally is characterized in that said outer heat transfer plates have smaller inlet and outlet openings for at least one fluid relative said inner heat transfer plates and that said modules are joined to each other round said inlet and outlet openings of respective outer heat transfer plates.
During joining of the modules, by means of welding, a welding set must be introduced in the inlet and outlet openings of one of the modules, so that the welding tip reaches the joint between the modules. By the present invention it has been easy to locate and reach the edges to be welded.
The present invention also refers to a plate heat exchanger for heat transfer between two fluids, comprising several permanently joined modules, each consisting of two outer heat transfer plates and between these, several principally rectangular inner heat transfer plates, which have inlet and outlet openings for respective fluids in their corner portions and a heat transfer portion located between respective inlet and outlet openings, characterized in that said outer heat transfer plates of two adjacent modules abut against each other in at least a continuous area round the inlet and outlet openings, respectively, at least for one fluid, and are joined to each other by means of a radial edge-weld, extending round the edge of said inlet and outlet openings of the outer heat transfer plates.
The invention will be described closer in the following, with reference to the accompanying drawing, on which:
FIG. 1 shows a schematic side-view of a plate heat exchanger according to the invention, and
FIG. 2 shows a cross-section through a part of a passage of the plate heat exchanger according to FIG. 1.
In FIG. 1 a plate heat exchanger 1 for heat transfer between two fluids is shown, comprising several permanently joined modules 2, each consisting of two outer heat transfer plates 3 and between these, several principally rectangular inner heat transfer plates 4. Through
REFERENCES:
patent: 5327958 (1994-07-01), Machata et al.
patent: 5462113 (1995-10-01), Wand
Blomgren Ralf
Nilsson Bo
Nilsson Mats
Alfa Laval AB
Flanigan Allen J.
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