Heat exchanger and processing method therefor

Abstract

A processing method for a heat exchanger is provided. The method includes: preparing a heat exchanger, twisting the processing section of the at least one heat exchange tube relative to the first section and the second section of the heat exchange tube along the length direction of the first tube; bending the processing section along a length direction of the processing section to make the processing section U-shaped or V-shaped, and reducing an included angle between the first section and the second section of the at least one heat exchange tube to a predetermined angle; and pushing the processing section by a predetermined distance along the same direction as a direction in which the processing section of the at least one heat exchange tube is twisted, to obtain a bent section from the processing section.

The invention claimed is: 
     
         1 . A processing method for a heat exchanger, comprising:
 preparing a heat exchanger, wherein the heat exchanger comprises a first tube and a second tube spaced apart from each other, and a plurality of heat exchange tubes spaced apart from each other, the plurality of heat exchange tubes are arranged in parallel along a length direction of the first tube, each heat exchange tube is respectively connected with the first tube and the second tube to communicate the first tube with the second tube, and, for at least one of the plurality of heat exchange tubes, a peripheral profile of a cross section of the at least one of the plurality of heat exchange tubes is generally flat, the at least one of the plurality of heat exchange tubes comprises a first side surface and a second side surface arranged in parallel in a thickness direction of the at least one of the plurality of heat exchange tubes, the at least one of the plurality of heat exchange tubes further comprises a third side surface and a fourth side surface arranged in parallel in a width direction of the at least one of the plurality of heat exchange tubes, a maximum distance between the first side surface and the second side surface of the at least one of the plurality of heat exchange tubes is smaller than a maximum distance between the third side surface and the fourth side surface of the at least one of the plurality of heat exchange tubes, projections of the first side surface, of the second side surface, of the third side surface and of the fourth side surface in the cross section of the at least one of the plurality of heat exchange tubes form the peripheral profile of the cross section of the at least one of the plurality of heat exchange tubes, the at least one of the plurality of heat exchange tubes comprises a first section, a processing section and a second section, one end of the first section of the heat exchange tube communicates with one end of the processing section, the other end of the first section communicates with the first tube, one end of the second section of the heat exchange tube communicates with the other end of the processing section, and the other end of the second section communicates with the second tube;   twisting the processing section of the at least one heat exchange tube relative to the first section and the second section of the heat exchange tube along the length direction of the first tube, so that an angle between a first side surface of the twisted processing section of at least part of the heat exchange tube and a first side surface of the first section of the heat exchange tube is greater than 0 degrees and less than or equal to 90 degrees;   bending the processing section along a length direction of the processing section to make the processing section U-shaped or V-shaped, and reducing an included angle between the first section and the second section of the at least one heat exchange tube to a predetermined angle;   pushing the processing section by a predetermined distance along the same direction as a direction in which the processing section of the at least one heat exchange tube is twisted, to obtain a bent section from the processing section, the predetermined distance being greater than or equal to 0.1 times of a width of the heat exchange tube;   wherein the first side surface of the at least one of the plurality of heat exchange tubes intersects with the third side surface of the at least one of the plurality of heat exchange tubes at a first edge, the second side surface of the at least one of the plurality of heat exchange tubes intersects with the fourth side surface of the at least one of the plurality of heat exchange tubes at a second edge, the second side surface of the at least one of the plurality of heat exchange tubes intersects with the third side surface of the at least one of the plurality of heat exchange tubes at a third edge, the first side surface of the at least one of the plurality of heat exchange tubes intersects with the fourth side surface of the at least one of the plurality of heat exchange tubes at a fourth edge,   wherein one end of the bent section of the at least one of the plurality of heat exchange tubes is connected with one end of the first section of the at least one of the plurality of heat exchange tubes, another end of the bent section of the at least one of the plurality of heat exchange tubes is connected with one end of the second section of the at least one of the plurality of heat exchange tubes, the another end of the first section of the at least one of the plurality of heat exchange tubes is connected with the first tube, another end of the second section of the at least one of the plurality of heat exchange tubes is connected with the second tube, and the at least one of the plurality of heat exchange tubes communicates the first tube with the second tube,   in a first plane parallel to the first edge and the third edge located in the first section, one end of a projection line of the second edge located in the bent section is connected with a projection line of the second edge located in the first section, a distance between another end of the projection line of the second edge located in the bent section and a projection line of the first edge located in the first section is denoted as L, and L of the at least one of the plurality of heat exchange tubes satisfies a formula: 1.1×Tw≤L≤3×Tw, wherein Tw is a width of the at least one of the plurality of heat exchange tubes;   a minimum included angle between a projection line of the first edge located in the bent section in the first plane and the projection line of the first edge located in the first section in the first plane is denoted as β, the angle β is greater than 0 degrees, and the included angles β of the plurality of heat exchange tubes are the same, and satisfy a formula: L2+Tw·cos β≤L1<L2+2Tw;   one end of a projection line of the first edge located in the bent section in the first plane is connected to the projection line of the first edge located in the first section in the first plane, and a connecting line between another end of the projection line of the first edge located in the bent section in the first plane and another end of the projection line of the second edge located in the bent section in the first plane and the projection line of the first edge located in the first section in the first plane define an included angle denoted as a therebetween, and the included angle α is greater than 10 degrees and less than 60 degrees; and   the bent section forms a slope.   
     
     
         2 . The processing method for the heat exchanger according to  claim 1 , wherein for the at least one heat exchange tube, bending the first section and the second section of the heat exchange tube relative to the processing section comprises:
 step S 1 : bending the first sections and the second sections of the plurality of heat exchange tubes relative to the processed sections of the plurality of heat exchange tubes, and bending an angle between a length direction of the first section and a length direction of the second section to a preset angle A1;   step S 2 : continuing to bend the processing section along a length direction of the processing section, and bending the angle between the length direction of the first section and the length direction of the second section to a target angle A2, wherein A2≥0°, and A2 is less than A1.   
     
     
         3 . The processing method for the heat exchanger according to  claim 2 , wherein pushing the processing section by a predetermined distance in the same direction as a direction in which the processing section of the heat exchange tube is twisted is performed after step S 1  and before step S 2 . 
     
     
         4 . The processing method for the heat exchanger according to  claim 1 , wherein at least one of a plurality of processing sections is sequentially pushed in the same direction as the direction in which the processing section of the respective heat exchange tube is twisted, or a plurality of the processing sections are pushed simultaneously in the same direction as the direction in which the processing sections of the respective heat exchange tubes are twisted. 
     
     
         5 . The processing method for the heat exchanger according to  claim 4 , wherein the predetermined distance of pushing is smaller than the width of the respective heat exchange tube. 
     
     
         6 . The processing method for the heat exchanger according to  claim 1 , wherein at least one of a plurality of the processing sections is sequentially twisted along the length direction of the first tube, or a plurality of the processing sections are simultaneously twisted. 
     
     
         7 . The processing method for the heat exchanger according to  claim 6 , comprising using a twisting paddle or a roller to be sequentially in contact with the first side surface of the processing section along the length direction of the first tube, so that the processing section is twisted relative to the first section and the second section of the heat exchange tube. 
     
     
         8 . The processing method for the heat exchanger according to  claim 1 , wherein the heat exchanger further comprises a fin, the fin is arranged between the first sections of the heat exchange tubes adjacent to each other in the length direction of the first tube and between the second sections of the heat exchange tubes adjacent to each other in the length direction of the first tube, and no fin is arranged between the processing sections of the heat exchange tubes adjacent to each other in the length direction of the first tube. 
     
     
         9 . The processing method for the heat exchanger according to  claim 2 , wherein pushing the processing section by a predetermined distance in the same direction as a direction in which the processing section of the heat exchange tube is twisted is performed synchronously with step S 2 .