Heat exchanger having laminated tubes

Abstract

A heat exchanger has a pair of heat exchanging parts composed of laminated tubes. Each tube is composed of a pair of metal sheets joined to each other. Locating parts each having a projecting piece and a recess are arranged on respective sides of the metal sheet. When the metal sheets are mated, the projecting pieces are engaged with the recesses, respectively. Moreover, the metal sheets are in inverse relation to each other about a top-and-back inversion axis and the projecting pieces are arranged symmetrically to the recesses about the top-and-back inversion axis.

1 . A heat exchanger, comprising: 
 a heat exchanging part including laminated tubes each of which has a pair of metal sheets joined to each other, each of the tubes having heat exchanging passage formed therein to extend along the longitudinal direction of the tube, and cylindrical tank parts formed at both ends of each heat exchanging passage to project from a main body of the tube, the cylindrical tank parts of the adjoining tubes connected with each other in communication with each other,    wherein the metal sheets have at least one top-and-back inversion axis about which one metal sheet is in inverse relation to the other metal sheet, and    wherein each metal sheet has a plurality of projecting pieces formed on the outer circumferential edge of the metal sheet so as to project toward a mate to the metal sheet and a plurality of recesses formed on the outer circumferential edge of the metal sheet so as to allow the projecting pieces to be inserted thereinto respectively, the projecting pieces being respectively arranged symmetrically to the recesses about the top-and-back inversion axis, thereby the projecting piece and the recess constituting a locating part when the metal sheets are mated, the locating parts are provided on at least respective sides of the metal sheet, respectively.    
   
   
       2 . The heat exchanger of  claim 1 , wherein the top-and-back inversion axis comprises a center line of the metal sheet in a longitudinal direction of the metal sheet.  
   
   
       3 . The heat exchanger of  claim 1 , wherein the top-and-back inversion axis comprises a center line of the metal sheet in a direction perpendicular to a longitudinal direction of the metal sheet.  
   
   
       4 . The heat exchanger of  claim 1 , wherein the laminated tubes constitute a pair of heat exchanging parts which are arranged side by side.  
   
   
       5 . The heat exchanger of  claim 1 , further comprising an inner fin which is disposed in the heat exchanging passage formed in the tube, wherein the projecting piece in at least one of the locating parts has a dimension in which a leading end thereof can pass through the recess at mating.  
   
   
       6 . The heat exchanger of  claim 5 , wherein the projecting pieces in the locating parts allocated on at least opposing sides of the metal sheets have a dimension in which respective leading end thereof can pass through the recess at mating.  
   
   
       7 . The heat exchanger of  claim 5 , wherein 
 the metal sheet has a substantially rectangular shape in plan view, and    the projecting pieces in the locating parts allocated on both long sides of the rectangular-shaped metal sheet have a dimension in which respective leading end thereof can pass through the recess at mating.    
   
   
       8 . The heat exchanger of  claim 5 , wherein the projecting pieces in the all locating parts have a dimension in which respective leading end thereof can pass through the recesses.  
   
   
       9 . The heat exchanger of the  claim 1 , wherein 
 the metal sheet has a substantially rectangular shape in plan view; and    two or more locating parts are arranged on each long side of the metal sheet.