Heat exchange – Flow passages for two confined fluids – Interdigitated plural first and plural second fluid passages
Patent
1987-12-23
1989-02-21
Scott, Samuel
Heat exchange
Flow passages for two confined fluids
Interdigitated plural first and plural second fluid passages
165 82, F28F 300
Patent
active
048056952
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a plate type heat exchanger and more specifically to a floating plate type heat exchanger which comprises a plurality of exchanger plates elastically supported by supporting members and in which respective fluid streams for heat exchange flow in directions perpendicular to each other at least just before inflow to the heat exchanger and just after outflow from the heat exchanger.
More precisely, the heat exchanger according to the present invention is primarily intended for applications in the field of heat recovery, for example, by exchanging heat between a hot stream leaving a processing section and a cold stream entering the processing section.
PRIOR ART
As for heat exchangers advantageously used in such field, a floating plate type heat exchanger is disclosed in Japanese Patent Application Laid-Open No. Sho 59-500580-A, in which the exchange plates are elastically supported by supporting members. The structure of the floating plate type heat exchanger disclosed in this patent application is schematically shown in FIG. 6.
Thus, FIG. 6 is a partially broken-away perspective view of the whole unit of the floating plate type heat exchanger. The floating plate type heat exchanger depicted in the drawing comprises a supporting structure composed of a pair of rectangular end walls 10 and corner posts 12 which located between the end walls 10 and joined at their opposite ends to respective corners of the end walls to form an enclosing frame.
A plurality of rectangular plates 14 which constitute a heat exchange medium are mounted between the rectangular end walls 10 in parallel with the latter and with a spacing to each other. On one surface of each rectangular plate 14, a plurality of dimples 16 are provided so as to ensure a spacing and to form a channel between each pair of adjacent rectangular plates. The dimples 16 have an approximatively elongated circular shape and are formed to define parallel projections from one surface of each rectangular plate.
FIGS. 7 (a) and 7 (b) depict a heat exchange plate constituting a part of the above-mentioned heat exchanger.
As shown in FIGS. 7 (a) and 7 (b), dimples 16 in adjacent rectangular plates are formed at right angles to each other. In addition, each rectangular plate is folded at both edges which are parallel with a longitudinal direction of the dimples so as to form side walls of the channel just below each rectangular plate. The dimples then serve also as supports against the force normal to the surface of the rectangular plates.
Each dimple is shaped in an elongated circle along the direction of fluid stream within the channel into which the dimples project, so as not to give significant resistance to the fluid stream. Accordingly, it is advantageous that the fluid flows in the direction of the arrow X in FIG. 7 (a), whereas the fluid flows in the direction of the arrow Y in FIG. 7 (b). FIG. 7 (c) is a cross-sectional view taken along a plane perpendicular to the plate plane of such a heat exchanger.
Furthermore, resilient separators not shown in FIG. 6 are inserted between the rectangular plates 14. Therefore, the rectangular plates 14 are elastically supported in the direction normal to their surfaces so that they are positioned with an appropriate spacing. By supporting the plates elastically in this way, thermal expansion in the direction normal to the plane of the rectangular plate is absorbed, thereby avoiding thermal deformation of the external surface of the heat exchanger.
In addition, as shown in FIG. 6, seal strips 18 which have an L-shaped cross-section are attatched to each corner of each rectangular plate 14, and a roll spring 20 formed of a resilient thin metal plate spirally rolled at least one turn, is inserted between the outside surface of the seal strip and the inside surface of the corner post 12. Stoppers 22 which are provided at the outside surface of the roll spring 20 prevent the roll spring 20 from getting out of the place.
In this way, the roll springs 20 not only seal the
REFERENCES:
patent: 1833166 (1931-11-01), Lucke
patent: 2064928 (1936-12-01), Lewis
patent: 3363681 (1968-01-01), Revilock et al.
patent: 3847211 (1974-11-01), Fischel et al.
patent: 4475589 (1984-10-01), Mizuno
Ishikawa Yoshitaka
Matsumoto Takeo
Kamen Noah
Scott Samuel
Sumitomo Heavy Industrie's, Ltd.
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