Heat exchange – Flow passages for two confined fluids – Interdigitated plural first and plural second fluid passages
Patent
1980-01-22
1982-11-30
Richter, Sheldon J.
Heat exchange
Flow passages for two confined fluids
Interdigitated plural first and plural second fluid passages
165130, 165170, F28F 312
Patent
active
043611842
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a plate heat exchanger, which comprises a plurality of plates arranged to the side of each other and each consisting of two metal sheets, which are welded one to the other along two parallel edges and have longitudinal bulgings in parallel with said edges. The present invention has the object to produce a plate heat exchanger where the medium flowing within the plate is guided in a direction in parallel with the extension of the bulgings and back in the same direction. This arrangement implies the further gain that substantially all surfaces of the plates flowed through by a medium participate in the heat exchange. This is not the case, for example, when at one end of the plate a box is used for turning the medium flowing through the plates.
BRIEF DESCRIPTION OF THE DRAWINGS
In order to achieve the aforesaid object, the invention has been given the characterizing features defined in the attached claims. An embodiment of the invention is described in the following, with reference to the accompanying drawings, in which
FIG. 1 is a perspective view seen obliquely from below of four plates with associated intakes, the casing about the heat exchanger being omitted,
FIG. 2 is a lateral view on an enlarged scale of the plates seen against the edge joints of the plates,
FIG. 3 is a section along the line III--III in FIG. 2 and, thus, a horizontal view of a metal sheet comprised in a plate.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1, thus, shows in a perspective way four plates, which are arranged to the side of each other and provided with an intake. The plates 1 at the embodiment shown are four in number and assembled of two metal sheets 2 and 3 so as to form a hollow flow body, see FIG. 2. Each plate has four passages 4, 5, 6 and 7. At the upper end of the plates a turning zone is formed so that the passage 4 turns into the passage 7, and the passage 5 turns into the passage 6. The design of the passages will become apparent in greater detail from the following. At the lower edge of the plates a distribution connecting piece 8 is attached, within which a partition sheet 9 is located to separate the passages 4 and 5 from the passages 6 and 7. A medium is hereby caused to flow into the plates according to arrow 10 and out of the plates according to arrow 11. In FIG. 1 the distribution connecting piece 8 is shown on an enlarged scale relative to the plates in order to simplify the illustration. The length of the plates 1, of course, can be varied entirely as desired in respect of the size of the heat surfaces. The second medium participating in the heat exchange flows between the plates 1, for example according to arrow 12. The flow path may also be from above according to arrow 13 and thereafter outward at the arrows 14 and 15. A casing of sheet metal is then placed about the plate package with an inlet provided at the upper edge and one or several outlets provided close to the areas marked by the arrows 14 and 15.
FIGS. 2 and 3 illustrate the structure of the plates and of the metal sheets constituting the same. FIG. 3 is a section along the line III--III in FIG. 2 and, thus, may be said to illustrate a metal sheet 3 seen from the inside. The metal sheet has longitudinal bulgings 16, 17, 18 and 19, which may consist of valleys of symmetric shape, for example a portion of an arc. In FIGS. 2 and 3 a special shape is shown where the valleys have a cross-sectional shape resembling half a pear, see the dashed lines 20. This shape, thus, is asymmetric relative to a central line in the valley. In order to render it possible, for example, for the passages 16 and 19 to meet in the turning zone, i.e. at the upper end of the plates, the asymmetric shape for the passages 16 and 19 must be identical but reversed, as also appears from FIG. 3.
The cross-sectional shape of the valley 17 is equal but reversed to that of the valley 16, and the cross-sectional shape for the valley 18 is reversed relative to the cross-sectional shape for the valley 17. A cros
REFERENCES:
patent: 552643 (1896-01-01), Jaennigen
patent: 1823788 (1931-09-01), Dewoitine
patent: 2779086 (1957-01-01), Rieppel et al.
patent: 2874942 (1959-02-01), Rieppel et al.
patent: 3141500 (1964-07-01), Raskin
patent: 3424238 (1969-01-01), Leeds et al.
Cark Johan Lockmans Ingenjorsbyra AB
Richter Sheldon J.
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