PLATE HEAT EXCHANGER

摘要

The present invention refers to a plate heat exchanger for at least two heat exchanging fluids, which heat exchanger is permanently joined and comprises at least one core of plates with a plurality of heat exchanging plates (2) and at least two end plates (3, 4), the heat exchanging plates (2) creating plate interspaces between each other. Each one of the heat exchanging plates (2) is equipped with one or several corrugations and at least four port holes (9, 10) being parts in an inlet channel (11) and an outlet channel (12) through the core of plates for each one of the fluids. The inlet channels (11) and the outlet channels (12) for a first and a second fluid respectively are in fluid communication with a first (13) and a second (14) set of plate interspaces respectively. The heat exchanging plates (2) have outer edges of a similar design and on each other bearing heat exchanging plates (2) in at least each one of the plate interspaces being parts of the said first set of plate interspaces (13) are brazed together in their outer edges, around at least two port holes (9) as well as in preferably all of those points upon the heat exchanging plates (2) where the respective corrugations bear on each other while on each other bearing heat exchanging plates (2) in at least each one of the plate interspaces being part of the said second set of plate interspaces (14) are brazed together in their outer edges and around at least two port holes (10) only.