Heat exchanger

Abstract

A heat exchanger includes a heat exchange tube, a first tube, a second tube and an inlet tube. The first and second tubes extend along a length direction of the heat exchanger, and the inlet tube is connected with the first tube. The heat exchange tube is connected with the first and second tubes, and has a plurality of flow channels communicated with the first and second tubes. The heat exchange tube includes a first heat exchange tube and a second heat exchange tube, and a flow inlet of the first heat exchange tube and a flow inlet of the second heat exchange tube are both arranged in a tube cavity of the first tube. There is a height difference between the flow inlet of the first heat exchange tube and the flow inlet of the second heat exchange tube in a height direction of the heat exchanger.

1 . A heat exchanger, comprising:
 a first tube extending and arranged along a length direction of the heat exchanger;   a second tube extending and arranged along the length direction of the heat exchanger;   an inlet tube connected with the first tube; and   a heat exchange tube connected with the first tube and the second tube, and having a plurality of flow channels, wherein the plurality of flow channels are communicated with the first tube and the second tube, the heat exchange tube at least comprises a first heat exchange tube and a second heat exchange tube, a flow inlet of the first heat exchange tube and a flow inlet of the second heat exchange tube are both arranged in a tube cavity of the first tube, and there is a height difference between the flow inlet of the first heat exchange tube and the flow inlet of the second heat exchange tube in a height direction of the heat exchanger.   
     
     
         2 . The heat exchanger according to  claim 1 , wherein the first heat exchange tube and the second heat exchange tube are arranged in parallel, the first heat exchange tube has a first end portion and a second end portion in the height direction of the heat exchanger, and the first end portion is inserted into the tube cavity of the first tube; and
 the first end portion is higher than the second end portion in the height direction of the heat exchanger, and a length of the first heat exchange tube inserted into the tube cavity of the first tube is less than a length of the second heat exchange tube inserted into the tube cavity of the first tube.   
     
     
         3 . The heat exchanger according to  claim 2 , wherein the first tube is higher than the second tube. 
     
     
         4 . The heat exchanger according to  claim 2 , wherein the first tube is arranged in flush with the second tube. 
     
     
         5 . The heat exchanger according to  claim 1 , wherein the first heat exchange tube and the second heat exchange tube are arranged in parallel, the first heat exchange tube has a first end portion and a second end portion in the height direction of the heat exchanger, and the first end portion is inserted into the tube cavity of the first tube; and
 the first end portion is lower than the second end portion in the height direction of the heat exchanger, and a length of the first heat exchange tube inserted into the tube cavity of the first tube is greater than a length of the second heat exchange tube inserted into the tube cavity of the first tube.   
     
     
         6 . The heat exchanger according to  claim 5 , wherein the first tube is lower than the second tube. 
     
     
         7 . The heat exchanger according to  claim 5 , wherein the first tube is arranged in flush with the second tube. 
     
     
         8 . The heat exchanger according to  claim 1 , wherein a plurality of first heat exchange tubes are arranged at intervals along the length direction of the heat exchanger to form a first heat exchange tube group, a plurality of second heat exchange tubes are arranged at intervals along the length direction of the heat exchanger to form a second heat exchange tube group, and the inlet tube is arranged at an end of the first tube, and the first heat exchange tube group is closer to the inlet tube than the second heat exchange tube group. 
     
     
         9 . The heat exchanger according to  claim 8 , wherein the heat exchanger further comprises a third heat exchange tube located between the first heat exchange tube group and the second heat exchange tube group in the length direction of the heat exchanger, and in the height direction of the heat exchanger, a flow inlet of the third heat exchange tube is located between the flow inlet of the first heat exchange tube and the flow inlet of the second heat exchange tube. 
     
     
         10 . The heat exchanger according to  claim 8 , wherein along the length direction of the heat exchanger, heights of the flow inlets of the first heat exchange tube group increase from the end of the first tube where the inlet tube is to the other end of the first tube; and
 along the length direction of the heat exchanger, heights of the flow inlets of the second heat exchange tube group increase from the end of the first tube where the inlet tube is to the other end of the first tube.   
     
     
         11 . The heat exchanger according to  claim 1 , wherein the first heat exchange tube comprises a first side portion and a second side portion sequentially arranged along a width direction of the heat exchanger, and in the height direction of the heat exchanger, the first side portion is lower than the second side portion. 
     
     
         12 . The heat exchanger according to  claim 1 , wherein the second heat exchange tube comprises a third side portion and a fourth side portion sequentially arranged along a width direction of the heat exchanger, and in the height direction of the heat exchanger, a height of the third side portion is smaller a height of the fourth side portion. 
     
     
         13 . The heat exchanger according to  claim 1 , wherein the first heat exchange tube comprises a first side portion and a second side portion sequentially arranged along a width direction of the heat exchanger, and in the height direction of the heat exchanger, the first side portion is lower than the second side portion; and
 the second heat exchange tube comprises a third side portion and a fourth side portion sequentially arranged along the width direction of the heat exchanger, and in the height direction of the heat exchanger, a height of the third side portion is smaller a height of the fourth side portion.   
     
     
         14 . The heat exchanger according to  claim 1 , wherein a section of the first heat exchange tube inserted into the tube cavity of the first tube has a first through hole, and the flow inlet of the first heat exchange tube includes the first through hole. 
     
     
         15 . The heat exchanger according to  claim 1 , wherein a section of the second heat exchange tube inserted into the tube cavity of the first tube has a second through hole, and the flow inlet of the second heat exchange tube comprises the second through hole. 
     
     
         16 . The heat exchanger according to  claim 1 , wherein a section of the first heat exchange tube inserted into the tube cavity of the first tube has a first through hole, and the flow inlet of the first heat exchange tube includes the first through hole; and
 a section of the second heat exchange tube inserted into the tube cavity of the first tube has a second through hole, and the flow inlet of the second heat exchange tube comprises the second through hole.   
     
     
         17 . The heat exchanger according to  claim 1 , wherein the height difference between the flow inlet of the first heat exchange tube and the flow inlet of the second heat exchange tube in the height direction of the heat exchanger is ΔH, a hydraulic diameter of the first tube is D, and ΔH and D satisfy a condition: 1/12D<ΔH<D. 
     
     
         18 . The heat exchanger according to  claim 1 , wherein a ratio of a total cross-sectional area of the flow channels of the second heat exchange tube to a total cross-sectional area of the flow channels of the first heat exchange tube is greater than or equal to 0.05 and less than or equal to 0.5. 
     
     
         19 . The heat exchanger according to  claim 1 , wherein the first heat exchange tube and the second heat exchange tube both comprise a straight section, one end of the straight section is communicated with the first tube, and the other end of the straight section is communicated with the second tube. 
     
     
         20 . The heat exchanger according to  claim 1 , wherein a plurality of first heat exchange tubes and a plurality of second heat exchange tubes are arranged, at least a part of each first heat exchange tube and at least a part of each second heat exchange tube comprise a bent section, one end of the bent section is communicated with the first tube, and the other end of the bent section is communicated with the second tube.