Flat heat exchange tube, heat exchanger, and construction machine

Abstract

The present invention relates to a flat heat exchange tube. The flat heat exchange tube comprises: planar wall portions extending in length and width directions of the heat exchange tube and spaced apart from each other in a thickness direction of the heat exchange tube, and side wall portions extending in length and thickness directions of the heat exchange tube across side edges of the planar wall portions, wherein at least one planar wall portion of the flat heat exchange tube is provided, in an area adjacent to its mounting position, with a stress relieving portion for relieving stress of a tube wall, the stress relieving portion comprising one or more elongated corrugated sections formed by local arching or recessing of the planar wall portion, and a longitudinal direction of the corrugated section being substantially identical with the width direction of the heat exchange tube. The present invention also relates to a heat exchanger comprising said flat heat exchange tube and a construction machine comprising said heat exchanger.

1 . A flat heat exchange tube, comprising: planar wall portions extending in length and width directions of the heat exchange tube and spaced apart from each other in a thickness direction of the heat exchange tube, and side wall portions extending in length and thickness directions of the heat exchange tube across side edges of the planar wall portions, wherein at least one planar wall portion of the flat heat exchange tube is provided, in an area adjacent to its mounting position, with a stress relieving portion for relieving stress of tube wall, the stress relieving portion comprising one or more elongated corrugated sections formed by local arching or recessing of the planar wall portion, and a longitudinal direction of the corrugated section being substantially identical with the width direction of the heat exchange tube. 
     
     
         2 . The flat heat exchange tube according to  claim 1 , characterized in that a first corrugated section is formed on a first planar wall portion of the flat heat exchange tube, and a second corrugated section is formed on a second planar wall portion of the flat heat exchange tube opposite to the first planar wall portion. 
     
     
         3 . The flat heat exchange tube according to  claim 2 , characterized in that the first corrugated section bulges in a first direction relative to a plane where the first planar wall portion is located, and the second corrugated section bulges in a second direction relative to a plane where the second planar wall portion is located, wherein the first direction is opposite to the second direction. 
     
     
         4 . The flat heat exchange tube according to  claim 3 , characterized in that the first and second corrugated sections are positioned opposite to each other in the thickness direction of the flat heat exchange tube. 
     
     
         5 . The flat heat exchange tube according to  claim 4 , characterized in that the first and second corrugated sections are convex strips arched toward outside of the heat exchange tube. 
     
     
         6 . The flat heat exchange tube according to  claim 1 , characterized in that the flat heat exchange tube is made of stainless steel. 
     
     
         7 . A heat exchanger for construction machinery, comprising: a heat exchange core, the heat exchange core comprising: a plurality of flat heat exchange tubes and fins arranged therebetween; a first header box connected to one end of each of the flat heat exchange tubes; and a second header box connected to the other end of each of the flat heat exchange tubes, wherein the flat heat exchange tube is the flat heat exchange tube according to any one of  claims 1 to 6 , each of the flat heat exchange tubes is installed to a corresponding header box in such a way that its open end passes through a hole formed on a fixed tube sheet fixedly connected to the corresponding header box and communicates with an interior of the corresponding header box, and the stress relieving portion arranged adjacent to the mounting position is located at a side of the fixed tube sheet away from the corresponding header box. 
     
     
         8 . The heat exchanger according to  claim 7 , characterized in that each of the flat heat exchange tubes is fixedly connected to the fixed tube sheet in a sealed manner by brazing. 
     
     
         9 . The heat exchanger according to  claim 8 , characterized in that it comprises a tube sheet frame integrally or detachably connected to the header box, and a peripheral side of the fixed tube sheet is fixedly connected with an inner peripheral wall of the tube sheet frame in a sealed manner. 
     
     
         10 . The heat exchanger according to  claim 9 , characterized in that the heat exchanger comprises a floating tube sheet arranged at a distance from the fixed tube sheet and on the side of the fixed tube sheet away from the header box, and a peripheral side of the floating tube sheet faces the inner peripheral wall of the tube sheet frame and maintains a predetermined gap with it, and the flat heat exchange tubes extend through holes of the floating tube sheet and are fixedly connected with it. 
     
     
         11 . The heat exchanger according to  claim 10 , characterized in that at least one stress relieving portion is arranged between paired floating tube sheet and fixed tube sheet in an area of the flat heat exchange tube adjacent to its mounting position. 
     
     
         12 . The heat exchanger according to  claim 11 , characterized in that flexible material is filled between the paired floating tube sheet and fixed tube sheet and between adjacent flat heat exchange tubes to absorb loads acting on the floating or fixed tube sheet or the flat heat exchange tubes. 
     
     
         13 . The heat exchanger according to  claim 12 , characterized in that the flexible material comprises rubber or asphalt. 
     
     
         14 . The heat exchanger according to  claim 7 , characterized in that the stress relieving portion extends over an entire width of the flat heat exchange tube. 
     
     
         15 . A construction machine comprising the heat exchanger according to  claim 7 . 
     
     
         16 . The construction machine according to  claim 15 , characterized in that the heat exchanger is an engine charge air cooler or a compressor charge air cooler.