Heat exchange – With repair or assembly means – Guide
Patent
1989-03-22
1992-01-28
Flanigan, Allen J.
Heat exchange
With repair or assembly means
Guide
165166, F28F 900, F28F 308
Patent
active
050834460
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a plate heat exchanger comprising several heat exchange plates arranged in a frame between a frame plate and a pressure plate, and suspended from a horizontal carrying bar, which has a hollow supporting body with protruding suspension means on its underside for the heat exchange plates.
Plate heat exchangers of this kind are common and a number of different types of carrying bars have been suggested for them. A previously known type of carrying bar is shown for instance in GB 624 865 and is essentially in the form of an I-beam, which is dimensioned with reference to recesses in the heat exchange plates. However, this carrying bar has not been sufficiently stiff against torsion in connection with large plate heat exchangers. Therefore, another type of carrying bar has been suggested, which is made of a hollow supporting body having a rectangular cross section, on the underside of which a part of an I-beam has been welded for carrying of the heat exchange plates. Carrying bars of both the above mentioned types are most expensive to manufacture.
A further type of carrying bar is shown in GB 624 865. Such a carrying bar is made of bent sheet material so that an upper hollow supporting body is formed, which at the bottom carries suspension means for the heat exchange plates. The suspension means have a width exceeding that of the supporting body, and consequently this type of carrying bar cannot be made too large, if the above mentioned recesses in the heat exchange plates should have reasonable dimensions.
Another problem arises when known carrying bars are used for plate heat exchangers in the food industry. Great demands are made on hygiene, and parts included in the plate heat exchangers must have a surface of a corrosion resistant material. It would be possible to manufacture the known carrying bars of a corrosions resistant material, but this would further increase the costs. Instead, up to now one has covered the carrying bars with a very thin sheet of stainless steel.
The object of the present invention is to provide a carrying bar which is inexpensive to manufacture irrespective of whether it is made of a corrosion resistant material or some other cheaper material. The carrying bar should also be simple to manufacture in different sizes for different plate heat exchangers. Another object is to keep down the weight of the carrying bar.
These objects are achieved with a plate heat exchanger of the initially described kind which essentially is characterized in that the supporting body and the suspension means are formed of a bent sheet material and that the carrying bar has opposite side walls, which extend to abutment against each other and are joined to each other at least at lower support surfaces located close to a vertical central plane through the carrying bar, and which beneath said support surfaces extend away from said central plane to form said suspension means.
By the present invention several advantages are achieved in comparison with carrying bars of the known type. On the one hand one starts from a sheet material which is being bent to a suitable form, which makes the proposed carrying bar very simple and inexpensive to manufacture, even if it is formed out of a corrosion resistant material, and on the other hand both the suspension means and the hollow beam of the carrying bar can easily be adapted to different heat exchange plates and/or to different sizes of the plate heat exchanger. The carrying capacity of the carrying bar can be varied by changing of the form of the carrying bar and/or by varying of the thickness of the sheet material. The carrying bar may of course be made by bending of only one sheet of material, but it has proved more suitable to make the carrying bar by bending of sheet material into two equal parts which are put together and fixed by welding to each other. Thus, within the scope of the invention it is obtained a great freedom of dimensioning the carrying bar for different existing recesses of different heat exchange plates, and ind
REFERENCES:
patent: 2920581 (1960-01-01), Cook et al.
Alfa-Laval Thermal AB
Flanigan Allen J.
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