Procedure For Manufacture Of A Tube For Conveyance Of A Fluid Of A Heat Exchanger, And Tube Obtained By Such Procedure

Abstract

The present invention concerns a procedure for manufacture of a tube for conveyance of a fluid of a heat exchanger, such tube being of the type presenting a substantially rectangular cross-section, formed by two opposed walls of greater width and two rounded walls of lesser width, said procedure consists of realising the following stages: a) Commencing from a metal sheet ( 2 ), realisation of a plurality of corrugations ( 3 ) by employing an embossing process; b) Realisation of the bending of sheet ( 2 ) by employing a process of embossing or forming; and c) Proceeding to weld the free edges ( 4 ) to close tube, considering the tolerances required.

1 . A procedure for manufacture of a tube ( 1 ) for conveyance of a fluid of a heat exchanger, such tube ( 1 ) being of the type presenting a substantially rectangular cross-section, formed by two opposed walls of greater width and two rounded walls of lesser width, characterized in that the procedure includes the following stages:
 a) commencing from a metal sheet ( 2 ), realisation of a plurality of corrugations ( 3 ) employing an embossing process;   b) realisation of the bending of the metal sheet ( 2 ) employing a process of embossing or forming; and   c) proceeding to weld the free edges ( 4 ) to close the tube ( 1 ), considering the tolerances required.   
   
   
       2 . A procedure according to  claim 1 , characterised in that, subsequent to stage c), cutting off the extreme ends ( 5 ) of the tube ( 1 ) is proceeded to. 
   
   
       3 . A procedure according to  claim 1 , characterised in that the corrugations ( 3 ) are embossed in those areas of the metal sheet ( 2 ) corresponding to the opposed walls of greater width of the tube ( 1 ) once fabricated, attaining part of the rounded walls of lesser width. 
   
   
       4 . A procedure according to  claim 3 , characterised in that the corrugations ( 3 ) are defined by a plurality of mutually parallel grooves transversely crossing said walls of greater width in a direction substantially diagonal to the axis of the tube ( 1 ). 
   
   
       5 . A procedure according to  claim 1 , characterised in that the corrugations ( 3 ) are embossed along the metal sheet ( 2 ) attaining extreme ends ( 5 ). 
   
   
       6 . A procedure according to  claim 1 , characterised in that the corrugations ( 3 ) are embossed along the metal sheet ( 2 ) avoiding extreme ends ( 5 ). 
   
   
       7 . A procedure according to  claim 1 , characterised in that the corrugations ( 3 ) are distributed in a manner being mutually non-equidistant, and non-symmetrical with respect to the bend line. 
   
   
       8 . A procedure according to  claim 7 , characterised in that the corrugations ( 3 ) are distributed maintaining the same angle of inclination such that once the metal sheet ( 2 ) has been bent, the corrugations ( 3 ) of one wall are positioned in a crossed manner with reference to those of the opposed wall, each pair of associated corrugations ( 3 ) defining a projection substantially in the form of an X. 
   
   
       9 . A procedure according to  claim 1 , characterised in that bending of the metal sheet ( 2 ) is realised along the middle in accordance with a longitudinal central line. 
   
   
       10 . A tube ( 1 ) for conveyance of a fluid of a heat exchanger of the type obtained employing the procedure for manufacture according to  claim 1 . 
   
   
       11 . A procedure according to  claim 2 , characterised in that the corrugations ( 3 ) are embossed in those areas of the metal sheet ( 2 ) corresponding to the opposed walls of greater width of the tube ( 1 ) once fabricated, attaining part of the rounded walls of lesser width. 
   
   
       12 . A procedure according to  claim 11 , characterised in that the corrugations ( 3 ) are defined by a plurality of mutually parallel grooves transversely crossing said walls of greater width in a direction substantially diagonal to the axis of the tube ( 1 ). 
   
   
       13 . A procedure according to  claim 2 , characterised in that the corrugations ( 3 ) are embossed along the metal sheet ( 2 ) attaining extreme ends ( 5 ). 
   
   
       14 . A procedure according to  claim 3 , characterised in that the corrugations ( 3 ) are embossed along the metal sheet ( 2 ) attaining extreme ends ( 5 ). 
   
   
       15 . A procedure according to  claim 4 , characterised in that the corrugations ( 3 ) are embossed along the metal sheet ( 2 ) attaining extreme ends ( 5 ). 
   
   
       16 . A procedure according to  claim 2 , characterised in that the corrugations ( 3 ) are embossed along the metal sheet ( 2 ) avoiding extreme ends ( 5 ). 
   
   
       17 . A procedure according to  claim 3 , characterised in that the corrugations ( 3 ) are embossed along the metal sheet ( 2 ) avoiding extreme ends ( 5 ). 
   
   
       18 . A procedure according to  claim 4 , characterised in that the corrugations ( 3 ) are embossed along the metal sheet ( 2 ) avoiding extreme ends ( 5 ).