Heat exchange – Gradated heat transfer structure
Patent
1983-07-29
1986-05-20
Cline, William R.
Heat exchange
Gradated heat transfer structure
165166, 165167, 165174, F28F 308, F28F 302, F28F 1300
Patent
active
045894809
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a heat exchanger comprising several plates mounted in a frame and mainly rectangular, which plates are tightened against each other and between which heat transfer areas in the form of heat exchanging passages are formed for through-flow of heat exchanging media, of which at least one is conducted to and from the heat exchanger via inlets and outlets arranged at one of its ends, the plates at their corner parts being provided with openings for forming of inlet and outlet channels.
Such plate heat exchangers are manufactured in different sizes having plates the heat transfer areas of which can range from some few square decimeters to several square meters. The plate material is chosen with regard to the field of use but usually comprises stainless or acid-resistant steel. For certain purposes titanium is used, which has excellent resistance against salt water but is very expensive.
Plate heat exchangers for large flows require inlet and outlet channels having large through-flow areas, i.e. large openings in the corner parts of the plates. That means that large parts of the plates have to be stamped away in order to get these large openings. Particularly in those cases when titanium is used that means that expensive material is stamped away.
In the inlet ports of the plates the flow is normally branched off for flowing through parallel-connected heat exchanging passages. Due to this fact the flow is reduced in size with the distance from the inlet. This fact means that seen from a theoretical point of view the port holes of the plates could be made smaller and smaller when the distance between the plates and the inlet becomes greater and greater.
If the port parts of the plates could be made smaller the useful heat transfer area could be made larger within the same raw sheet-metal size. In practice, however, it is not possible to arrange plates provided with port holes becoming smaller and smaller. Firstly, it would mean that it would be necessary for a plate heat exchanger supplier to have a very great number of plates in stock, which is not economically justifiable. Secondly, it would be necessary to have many expensive press tools.
Thus, there is a need in the market of a plate heat exchanger in which at least certain plates are provided with port-holes, which are smaller than those of the plates closest to the inlet. At the same time such a heat exchanger partly has to be economically justifiable, partly has to function satisfyingly.
By giving the heat exchanger such a design that is mentioned in the claims the existing needs can be filled.
According to a preferred embodiment the heat exchanger is provided with two groups of plates, the plates in one group having port holes mainly of one and the same size, while the plates in the second group have port holes of another size, which is mainly one and the same. The placing of the groups shall be such that the group of plates provided with the large port holes are placed closest to the connections of the frame plate. The groups are preferably separated by means of a separation plate arranged preferably by means of gaskets to tighten against the plates of respective groups.
The invention shall in the following be described more in detail with reference to the accompanying Figures, of which
FIG. 1 shows a side view of a heat exchanger according to the invention having two groups of plates;
FIGS. 2a and 2b show plan view of the corner parts of two plates having large and small openings, respectively;
FIG. 3 shows a plan view of the corner part of a plate having a large opening put on a separation plate with a plate having a smaller opening indicated beneath;
FIGS. 4a and 4b schematically show plan views of parts of plates having small and large openings, respectively, and corresponding heat transfer areas; and
FIG. 5 shows a vertical, longitudinal section of a separation plate with plate groups having large and small openings, respectively, indicated in the corner parts.
In FIG. 1 is by 1 indicated a frame comprising a frame plate 2 ha
REFERENCES:
patent: 2554185 (1951-05-01), Giegerich
patent: 2798694 (1957-07-01), Sullivan
patent: 2838288 (1958-06-01), Stoelting et al.
patent: 3196937 (1965-07-01), Jenssen
patent: 3908758 (1975-09-01), Armonies et al.
patent: 4176713 (1979-12-01), Fisher
patent: 4303124 (1981-12-01), Hessari
Alfa-Laval AB
Cline William R.
Ford John K.
Hapgood Cyrus S.
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