Swep International Ab

Alfa-laval Thermal Ab

Per Rissler

Sven Andersson

Jarl A Andersson

Thomas Dahlberg

Nils-Ake Jonsson

Lars Fogelberg

Nils-ANGke Jonsson

Bengt-Ove S&auml;iner

Lennart Edso

Peter Nilsson

Magnus Folkelid

Brazed double wall plate heat exchangers are manufactured so that the double walls are connected and sealed to each other around port holes of the exchanger. This is obtained by providing areas that are shaped so as to include areas not covering each other. The brazing is provided by capillary suction of brazing material from other plate areas.

Method of manufacturing a plate heat exchanger

A container ( ) adapted to avoid peak temperatures of water delivered from a heat exchanger ( ) is provided with interior reinforcing means ( , FIG. &prime;&Prime;, FIGS. ) connecting opposite parts of the wall ( &prime;) of the container ( ). Even with a thin container wall this makes it possible to use a box shaped container design without risk of deformations due to variations in the water pressure. The reinforcing means may consist of stacked interconnected plates ( &prime;&Prime;)&mdash;e.g. having the same form and size as plates ( &Prime;) used in a plate heat exchanger connected to the container ( ).

Water heater comprising a plate heat exchanger and a storage container for heated water

Plate heat exchanger

In a plate heat exchanger having a frame plate and a pressure plate, at least one of these plates has holes for flow of the heat exchanging media to and from respective passages in the pack of heat exchange plates. Each of these holes has a lining of corrosion-resistant metal comprising a hollow cylinder with thin flanges at its opposite ends engaging opposite sides of the frame plate or pressure plate. One of these flanges has a seamless connection with the hollow cylinder and is sealingly compressed between a heat exchange plate and an undepressed surface of the inner side of the adjacent frame plate or pressure plate. Lining of the hole is effected by plastically deforming a metal disc into a hollow cylinder with a flange at one end, inserting the other end of the cylinder through the hole to engage the flange with said undepressed surface, and then providing said other end of the cylinder with a flange engaging an undepressed surface of the outer side of the frame or pressure plate.

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Skanör, Sweden

Per Rissler