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Heat-exchanging conduit tubes for a laminated heat exchanger made of aluminum material containing aluminum alloy having a brazing material claded and formed by folding one plate or overlaying two plates and brazing to connect edge joints of the folded plate or the overlaid plates, wherein the folded

Heat-exchanging conduit tubes for a laminated heat exchanger made of aluminum material containing aluminum alloy having a brazing material claded and formed by folding one plate or overlaying two plates and brazing to connect edge joints of the folded plate or the overlaid plates, wherein the folded plate or the overlaid plates have projections protruded from one or both faces of the opposed plates toward the other plate, the projections are joined in contact with a flat face of the other plate or the projections of the other plate, and the edge joints of the folded plate or the overlaid plates are joined, and the height of the edge joint of the each plate is smaller than those of the projections. Thus, the heat-exchanging conduit tubes can be securely brazed to provide flat tubes having a satisfactory pressure resistance, and a method for producing them can be attained.

대표청구항 ▼

[ We claim:] [1.] Conduit tubes for a condenser made of aluminum material containing aluminum alloy having a brazing material clad and formed by folding a single plate which has inwardly protruded projections from its flat surface or by overlaying two plates which have inwardly protruded projections

[ We claim:] [1.] Conduit tubes for a condenser made of aluminum material containing aluminum alloy having a brazing material clad and formed by folding a single plate which has inwardly protruded projections from its flat surface or by overlaying two plates which have inwardly protruded projections from their flat surfaces, and contacting the ends of said projections with those of opposed projections and brazing to bond edges of the folded plate or the overlaid plates and the ends of said projections to those of the opposed projections, whereinthe height of the edge joint of each plate is smaller than those of said projections to form a gap between the edge joint,ends of the heat-exchanging conduit tubes are inserted into insertion ports of distributing/collecting members, andthe ends of said projections and said edge joints of said folded plate or the overlaid plates are brazed to be bonded to those of the opposed plate.