Heat exchange – Three non-communicating fluids
Patent
1998-06-08
2000-11-07
Flanigan, Allen
Heat exchange
Three non-communicating fluids
165167, F28D 710
Patent
active
061422215
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a three-circuit plate heat exchanger.
More particular the invention relates to a three circuit plate heat exchanger comprising a stack of at least 10 sheet metal plates having identical outside shape and dimensions, each of said plates being provided with six spaced holes identically located, holes of the same location having equal diameters in all plates, said plates forming channels for fluids of the three circuits, the holes in the plates forming six ports for inlet and outlet of said fluids of the three circuits.
Heat exchangers of this type are known e.g. from the Patent Abstracts of Japan, Vol 13, No. 582, M-911, Abstract of JP, A, 1-244290 (HISAKA WORKS LTD), Sep. 28, 1989 and from Derwent's abstract, No. 84-4933101, weeek 8401, ABSTRACT OF SU, 1000718 (MOSC MOSZHILNIIPROE), Feb. 28, 1983.
An advantage of using plate heat exchangers is that they have a high heat exchanging capacity relative their volume. Two-circuit plate heat exchangers may be fitted with connections on one or both sides of the exchanger for the two flows of fluid which should exchange heat. It is also a general object to be able to manufacture plate heat exchangers at a low cost--e.g. by gluing, welding or soldering together the plates of the heat exchanger.
The object of the present invention is to design a three-circuit plate heat exchanger which is reliable in operation and cheap in manufacture. It should, therefore, contain a minimum of different heat exchanger plates and said plates should be of a simple design. It should also be. possible to assemble the elements of the exchanger easily and permanently by gluing welding or soldering. The advantage found in two-circuit plate heat exchangers of enabling connection of tubing for the flows of fluid according to wish on either or both sides of the exchanger should be retained.
According to the present invention a three-circuit plate heat exchanger of the type referred to above is characterised in that the plates are of two different designs--the first plate design having two holes located in plate areas in a common plane, while the remaining four holes are located in plate areas displaced equally downwards relative the plane in which said two holes are located--the second plate design having four holes displaced correspondingly upwards relative to its remaining two holes which are located in plate areas in a common plane, that plates of the two different designs are located alternating in the stack of plates, and
that at each port the entrance to channels to be passed by fluids of the two circuits not passing said port is blocked by gluing, soldering or welding together of ring shaped plate areas adjacent to said holes, ring shaped spacers being inserted between plates which are spaced from each other at said ring shaped areas adjacent to said holes.
The invention will be described in more detail reference being made to the accompanying drawing in which
FIG. 1 is a perspective view of a three-circuit heat exchanger according to the invention,
FIG. 2 is a vertical section through the exchanger along the the line II--II in FIG. 1.
FIG. 3 shows from above one of two types of heat exchanger plates used in the exchanger of FIGS. 1 and 2,
FIG. 4 shows from above the other type of heat exchanger plates used, and
FIG. 5 shows a section corresponding to that of FIG. 2 through another embodiment of the invention.
Referring first to FIGS. 1 and 2 the plate heat exchanger shown has an outer casing 1 provided with six port inlets and -outlets 2-7 for the three flows of fluid which should pass the exchanger. The first flow of fluid--e.g. cooling water--has been designated by the letter x and enters the exchanger through an inlet port 2 and exits the exchanger via an outlet port 3. One of the two fluids to be cooled has been designated by the letter y and enters through an inlet port 4 and exits via an outlet port 5. The other of the two flows to be cooled has been designated by the letter z and enters via an inlet port 6 and exits via an outlet port 7. FIG. 2 i
REFERENCES:
patent: 5462113 (1995-10-01), Wand
patent: 5810071 (1998-09-01), Pavlin
Flanigan Allen
SWEP International AB
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