| 摘要 |
PROBLEM TO BE SOLVED: To reduce the amount of the brazing material to be used, and to increase the strength of a brazed plate heat exchanger. SOLUTION: The invention refers to a method of brazing together thin heat exchanging plates of an iron-based base material provided with a plurality of port holes and a pressing pattern of elevations and depressions over the heat exchanging area of the plates and, if present, also over the distribution area to a plate heat exchanger. The plates are coated with brazing material and are arranged such that contact between elevations and depressions in adjacent plates is obtained prior to the brazing together. The plates are then brazed together at the resultant contact points. Only 5 to 40%, preferably 10 to 30%, of the heat exchanging area and the distribution area are coated with brazing material comprising one or a plurality of iron alloys. The one or a plurality of the iron alloys include a component reducing a melting point. The brazing material comprises a binder as well, and is coated as paste before the heat exchanging plates are brazed together so as to be a heat exchanger. COPYRIGHT: (C)2009,JPO&INPIT |
