Heat exchange – With repair or assembly means – Guide
Patent
1988-01-19
1989-02-14
Scott, Samuel
Heat exchange
With repair or assembly means
Guide
165166, 165167, 291573R, 291573C, F28F 308
Patent
active
048040401
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a kind of plate heat exchanger comprising a bundle of several heat exchange plates, which are arranged between a frame plate and a pressure plate and are supported by a lower carrying bar, said lower carrying bar and an upper guiding bar extending through recesses in the lower and upper parts, respectively, of the heat exchange plates, and in particular to a plate heat exchanger in which at least the upper part of each heat exchange plate is provided with at least one lug extending into the upper recess and forming an upper constriction of said recess for retaining the heat exchange plate in position on said guiding bar.
Plate heat exchangers of this kind are common on the market. Generally, one would like to use bars having standard cross-sections, e.g. round bars, both for the lower carrying bar and the upper guiding bar. For this reason conventional heat exchange plates have been provided with U-shaped recesses in both their upper and lower parts. However, to prevent the plates from loosing engagement with the upper guiding bar and the bundle of plates falling apart during assembling or disassembling of the plate heat exchanger, one has been forced after placing of each plate in the heat exchanger to fasten a separately attached bracket on the plate to bridge the upper recess in the plate above the said guiding bar. Alternatively one has had to replace the round bars with specially formed beams cooperating with specially formed recesses in the heat exchange plates, as illustrated in U.S. Pat. No. 2,252,916 and British Pat. No. 1 129 924.
Both these arrangements have proved to be extremely expensive. Therefore, there has been a demand on the market for another solution to the problem as to how the heat exchange plates, while resting on the lower carrying bar, should be fixed relative to the upper guiding bar in order to prevent the bundle of plates from falling apart.
SUMMARY OF THE INVENTION
According to the present invention a solution to said problem is obtained by means of a plate heat exchanger of the type described, which is characterized in that each heat exchange plate is flexible enough in the area of the said lug to allow the lug to be bent aside perpendicularly to the plane of the heat exchange plate, providing an opening for insertion of the guiding bar into the recess, and to spring back after mounting of the plate in the plate heat exchanger.
By this invention the heat exchange plates may be easily assembled between the guiding bar and the carrying bar. Further, the guiding bar can be a cheap round bar or a bar having another cross-section, i.e. a square section.
Further features of the invention will appear in more detail from the following description of the invention with reference to the accompanying drawing, in which
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 shows a plate heat exchanger according to the invention, and
FIGS. 2-5 show four different embodiments of the upper part of a heat exchange plate for a plate heat exchanger according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to FIG. 1 there is shown a plate heat exchanger 1 comprising several heat exchange plates 2, a frame plate 3 and a pressure plate 4. The heat exchange plates 2 are clamped between the frame plate 3 and the pressure plate 4 by means of fastening bolts 5. An upper guiding bar 6 and a lower carrying bar 7 extend through upper and lower parts respectively of the heat exchange plates 2. The heat exchange plates 2 rest on the lower carrying bar 7 and are supported thereby.
Referring to FIG. 2 there is shown a first embodiment of an upper part of a heat exchange plate 2A provided with an essentially circular recess 8 intended to admit attachment of the heat exchange plate 2A on a guiding bar (not shown). The recess 8 is located within the periphery 9 of the plate. A first part 10 of the recess 8 is formed like a circle, the centre 11 of the circle lying at a distance from the periphery 9 of the plate, which is greater than
REFERENCES:
patent: 1854275 (1932-04-01), Rumpf et al.
patent: 2252916 (1941-08-01), Crosby
patent: 3448796 (1969-06-01), Usher
patent: 3526337 (1970-09-01), Paxton
patent: 4301915 (1981-11-01), Michalik et al.
Ebbe Nilsson
Jan-Ove Bergqvist
Jarl Andersson
Alfa-Laval Thermal AB
Price Carl D.
Scott Samuel
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