Flat tube, heat exchange core and heat exchanger

Abstract

A flat tube, a heat exchange core and a heat exchanger. The flat tube comprises a tube body, wherein the tube body comprises at least a first tube body and a second tube body; the first tube body is provided with a plurality of first hole channels, each of which extends in the length direction of the tube body, the plurality of first hole channels being arranged in the width direction of the first tube body; the second tube body is provided with a plurality of second hole channels, each of which extends in the length direction of the tube body, the plurality of second hole channels being arranged in the width direction of the second tube body; in the thickness direction of the first tube body, the first tube body is provided with a first wall; in the thickness direction of the second tube body, the second tube body is provided with a second wall; and the first wall of the first tube body and the second wall of the second tube body are arranged opposite each other, and the first wall of the first tube body is welded and fixed to the second wall of the second tube body. The tube body is divided into a first tube body having first hole channels and a second tube body having second hole channels, such that the first tube body and the second tube body are separately machined and formed so as to be welded and fixed, thereby reducing the difficulty of manufacturing the flat tube.

Description

[0001] The present application claims the priority to Chinese Patent Application No. 202211331545.1, titled "FLAT TUBE, HEAT EXCHANGE CORE AND HEAT EXCHANGER", filed with the China National Intellectual Property Administration on October 28, 2022, the entire content of which is incorporated herein by reference.FIELD

[0002] The present application relates to the technical field of heat exchange, in particular to a flat tube, a heat exchange core and a heat exchanger.BACKGROUND

[0003] A heat exchanger typically uses a flat tube for fluid circulation, and the hole channels in the flat tube are typically arranged in a row in a width direction of the flat tube. In order to improve the heat exchange effect of the heat exchanger, more than two rows of hole channels are provided in the flat tube to increase the contact area between the fluid and the flat tube, and the flat tube is typically formed by extrusion. The flat tube with more than two rows of hole channels has higher requirements for an extrusion mold and the extrusion technology and it is difficult to manufacture.SUMMARY

[0004] An object of the present application is to provide a flat tube, a heat exchange core having the flat tube and a heat exchanger including the heat exchange core, which is convenient to manufacture.

[0005] An embodiment of the present application provides a flat tube, which includes a tube body. The tube body includes at least a first tube body and a second tube body; the first tube body has multiple first hole channels, each of which extends in a length direction of the tube body; the second tube body has multiple second hole channels, each of which extends in the length direction of the tube body. The first tube body is provided with a first wall in a thickness direction of the first tube body, and the second tube body is provided with a second wall in a thickness direction of the second tube body. The first wall of the first tube body and the second wall of the second tube body are opposite to each other, and the first wall of the first tube body is welded and fixed to the second wall of the second tube body.

[0006] According to the technical solutions, the tube body is divided into a first tube body having first hole channels and a second tube body having second hole channels, and the first tube body and the second tube body are respectively processed and welded and fixed, thereby reducing the manufacturing difficulty of the flat tube.

[0007] An embodiment of the present application provides a heat exchange core, which includes a first collecting assembly, a second collecting assembly and multiple flat tubes, and each of the multiple flat tubes is the above flat tube. The flat tube includes a first end and a second end in the length direction of the flat tube, the first end of the flat tubes is connected to the first collecting assembly, and the second end of the flat tube is connected to the second collecting assembly. Each of the first collecting assembly and the second collecting assembly includes at least one chamber, and the first hole channel and the second hole channel of the flat tube are communicated with the at least one chamber of the first collecting assembly, and the first hole channel and the second hole channel of the flat tube are communicated with the at least one chamber of the second collecting assembly. The heat exchange core has a first fluid passage, and the first hole channel, the second hole channel, the chamber of the first collecting assembly and the chamber of the second collecting assembly are at least part of the first fluid passage.

[0008] In the above technical solutions, both of the first hole channel and the second hole channel are used as a portion of the first fluid passage, and there is no requirement for heat exchange between the fluid within the first hole channel and the fluid within the second hole channel, thus reducing the requirement for welding between the first tube body and the second tube body.

[0009] An embodiment of the present application provides a heat exchanger, which includes a shell and the above heat exchange core. The shell is fixed to the first collecting assembly for hermetical sealing, and the shell is fixed to the second collecting assembly for hermetical sealing, and a medium cavity is provided in the shell. The heat exchanger is provided with a second fluid passage, the first fluid passage is not communicated with the second fluid passage, and the medium cavity is at least part of the second fluid passage.

[0010] An embodiment of the present application provides a heat exchanger, which includes a shell and the heat exchange core accommodated in the shell. The shell includes a first body and a second body, which are fixed to each other for hermetical sealing; the first collecting assembly includes a first cavity and a second cavity, the shell has a first port and a second port; the first cavity is communicated with the first port, and the second cavity is communicated with the second port.

[0011] In the above technical solutions, the heat exchanger includes the above flat tube and the heat exchange core, so it is also convenient to manufacture.BRIEF DESCRIPTION OF THE DRAWINGS

[0012] FIG. 1 is a perspective view of an embodiment of a flat tube; FIG. 2 is a sectional view of an embodiment of the flat tube; FIG. 3 is a sectional view of another embodiment of the flat tube; FIG. 4 is a partial enlarged view at A in FIG. 2; FIG. 5 is a partial enlarged view at B in FIG. 3; FIG. 6 is a partial enlarged view of another embodiment of the flat tube; FIG. 7 is a partial enlarged view of yet another embodiment of the flat tube; FIG. 8 is a schematic view of an overall structure of an embodiment of a heat exchange core according to the present application; FIG. 9 is a top view of the heat exchange core shown in FIG. 8; FIG. 10 is a schematic view showing a cross-sectional structure taken along an direction A-A in FIG. 9; FIG. 11 is a schematic view showing a cross-sectional structure taken along a direction B-B in FIG. 9; FIG. 12 is a partial enlarged view at C in FIG. 11; FIG. 13 is an exploded view of an embodiment of a first collecting assembly; FIG. 14 is an exploded view of an embodiment of a second collecting assembly; FIG. 15 is a schematic view of an overall structure of an embodiment of a heat exchanger according to the present application; FIG. 16 is a top view of the heat exchanger shown in FIG. 15; FIG. 17 is a schematic view showing a cross-sectional structure taken along a direction C-C in FIG. 16; FIG. 18 is a schematic view showing a cross-sectional structure taken along a direction D-D in FIG. 16. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0013] Specific embodiments will now be described in detail with reference to the accompanying drawings. In order to fully understand the present invention, numerous specific details are set forth in the following detailed description, but it should be understood by those skilled in the art that the specific assemblies, devices and features illustrated in the accompanying drawings and described herein are merely exemplary and should not be regarded as limiting.

[0014] A flat tube 1 is typically used in a heat exchanger 100, and the flat tube 1 is typically provided with multiple channels for a fluid to flow through. As shown in FIG. 1 to FIG. 7, the flat tube 1 includes a tube body, which is formed by welding a first tube body 11 and a second tube body 12. Specifically, the first tube body 11 is a flat tube, and the first tube body 11 has a first wall 112 and a third wall 111 in a thickness direction of the first tube body 11. The second tube body 12 is flat tube, and the second tube body 12 has a second wall 121 and a fourth wall 122 in a thickness direction of the second tube body 12. The first wall 112 of the first tube body 11 is opposite to the second wall 121 of the second tube body 12, and the first wall 112 of the first tube body 11 is welded and fixed to the second wall 121 of the second tube body 12.

[0015] As shown in FIG. 1, the direction L is a length direction of the flat tube 1 and also the length direction of the first tube body 11 and the second tube body 12, and the direction W is a width direction of the flat tube 1 and also a width direction of the first tube body 11 and the second tube body 12. As shown in FIG. 2, the direction H is a thickness direction of the flat tube 1 and also the thickness direction of the first tube body 11 and the second tube body 12. The first tube body 11 has multiple first hole channels 115, each of which extends in the length direction of the tube body, and the multiple first hole channels 115 are arranged in a row in a width direction of the first tube body 11. The second tube body 12 has multiple second hole channels 125, each of which extends in the length direction of the tube body, and the multiple second hole channels 125 are arranged in a width direction of the second tube body 12. The tube body is divided into a first tube body 11 having first hole channels 115 and a second tube body 12 having second hole channels 125, such that the first tube body 11 and the second tube body 12 can be separately machined and formed so as to be welded and fixed, thus reducing the difficulty of manufacturing the flat tube 1. For example, the first tube body 11 and the second tube body 12 can be extruded separately. Since the structures of the first tube body 11 and the second tube body 12 are relatively simple, the requirements for the extrusion mold and the extrusion process are relatively low, and thus it is easy to extrude and form the first tube body 11 and the second tube body 12. In addition, the welding process of the first tube body 11 and the second tube body 12 is also relatively simple, thus reducing the difficulty of manufacturing the flat tube 1. Of course, the flat tube 1 may also consist of three or more flat tubes stacked and fixed and welded in the thickness direction.

[0016] In some embodiments, in conjunction with FIG. 2 and FIG. 4, the first hole channel 115 and the second hole channel 125 are circular in cross-section. In the thickness direction of the first tube body 11, a distance between a wall 13 forming the first hole channel and the third wall 111 is defined as a1 ; and a distance between the wall 13 forming the first hole channel and the first wall 112 is defined as b1 , where a1 > b1 . In the thickness direction of the second tube body 12, a distance between a wall 14 forming the second hole channel, and the fourth wall 122 is defined as a2; and a distance between the wall 14 forming the second hole channel, and the second wall 121 is defined as b2, where a2 > b2. Since the third wall 111 and the fourth wall 122 serve as the outer surfaces of the tube body, and the first wall 112 is welded and fixed to the second wall 121, the pressures withstood by the first wall 112 and the second wall 121 counteract each other out. By controlling a1 > b1 , and / or a2 > b2, under the condition that the thickness of the tube body is constant, the strength of the tube body can be enhanced so as to be suitable for working conditions where an internal fluid pressure is high, for example in a CO2 heat exchanger.

[0017] In some embodiments, in conjunction with FIG. 3 and FIG. 5, in the width direction of the first tube body 11, a distance between two adjacent first hole channels 115 is defined as c1 , that is, a distance between the wall 13 forming the first hole channel and the wall 13 forming the first hole channel adjacent thereto is c1 , in which the same first hole channel 115 satisfies: c1 < b1 . In the width direction of the second tube body 12, a distance between two adjacent second hole channels 125 is defined as c2, that is, a distance between the wall 14 forming the second hole channel, and the wall 14 forming the second hole channel adjacent thereto is c2, in which the same second hole channel 125 satisfies: c2 < b2. Since the internal pressures withstood between the adjacent first hole channels 115 or the adjacent second hole channels 125 can counteract each other, the distance between adjacent hole channels can be set relatively small, which has less influence on the strength of the flat tube 1. Under the condition that the width of the flat tube 1 is constant, more hole channels can be provided to improve the contact area between the fluid within the hole channels and the flat tube 1, and to enhance the heat exchange performance.

[0018] In some embodiments, as shown in FIG. 6, the wall 13 forming the first hole channel includes a first straight wall portion 131, a third straight wall portion 132, a fourth straight wall portion 133 and a first curved wall portion 134. The first curved wall portion 134 protrudes toward the third wall 111, and first straight wall portion 131 is closer to the first wall 112 than the first curved wall portion 134. The third straight wall portion 132 connects the first straight wall portion 131 to the first curved wall portion 134, and the fourth straight wall portion 133 connects the first straight wall portion 131 and the first curved wall portion 134. As shown in FIG. 6, the first hole channel has a similar D-shape. Of course, the third straight wall portion 132 may not be perpendicular to the first straight wall portion 131, and the fourth straight wall portion 133 may not be perpendicular to the first straight wall portion 131. In the thickness direction of the first tube body 11, a distance between the first curved wall portion 134 and the third wall 111 is a1 , and a distance between the first straight wall portion 131 and the first wall 112 is b1 , where a1 > b1 . The wall 14 forming the second hole channel includes a second straight wall portion 141, a fifth straight wall portion 142, a sixth straight wall portion 143 and a second curved wall portion 144. The second curved wall portion 144 protrudes toward the fourth wall 122, the second straight wall portion 141 is closer to the second wall 121 than the second curved wall portion 144. The fifth straight wall portion 142 connects the second straight wall portion 141 and the second curved wall portion 144, and the sixth straight wall portion 143 connects the second straight wall portion 141 and the second curved wall portion 144. In the thickness direction of the second tube body 12, a distance between the second curved wall portion 144 and the fourth wall 122 is a2, and a distance between the second straight wall portion 141 and the second wall 121 is b2, where a2 > b2. The curved structure facilitates improving the strength, and the wall portion close to an outer side surface of the tube body is provided in a curved structure, thereby improving the strength of the flat tube 1.

[0019] In some embodiments, as shown in FIG. 7, the wall 13 forming the first hole channel includes a first wall portion 135, a second wall portion 136, a third wall portion 137 and a fourth wall portion 138. The first wall portion 135 and the second wall portion 136 are arranged in the thickness direction of the first tube body 11, and the third wall portion 137 and the fourth wall portion 138 are arranged in the width direction of the first tube body 11. The third wall portion 137 connects the first wall portion 135 and the second wall portion 136, and the fourth wall portion 138 connects the first wall portion 135 and the second wall portion 136. As shown in FIG. 7, the first hole channel 115 is a rectangular hole channel. Of course, the first hole channel 115 may also be a trapezoidal hole channel. The first wall portion 135 and the second wall portion 136 are respectively provided with first protruding ribs 139 protruding toward each other, and the first wall portion 135 is closer to the third wall 111 than the second wall portion 136. In the thickness direction of the first tube body 11, a distance between the first wall portion 135 and the third wall 111 is a1 , and a distance between the second wall portion 136 and the first wall 112 is b1 , where a1 > b1 . By providing the first ribs 139, the contact area between the fluid within the first hole channel 115 and the first tube body 11 is increased, and the heat exchange effect of the flat tube 1 is improved. The wall 14 forming the second hole channel includes a fifth wall portion 145, a sixth wall portion 146, a seventh wall portion 147 and an eighth wall portion 148. The fifth wall portion 145 and the sixth wall portion 146 are provided with second protruding ribs 149 protruding toward each other. The fifth wall portion 145 and the sixth wall portion 146 are arranged in the thickness direction of the second tube body 12, and the seventh wall portion 147 and the eighth wall portion 148 are arranged in the width direction of the second tube body 12. The seventh wall portion 147 connects the fifth wall portion 145 and the sixth wall portion 146, and the eighth wall portion 148 connects the fifth wall portion 145 and the sixth wall portion 146, and the fifth wall portion 145 is closer to the second wall 121 than the sixth wall portion 146. In the thickness direction of the second tube body 12, a distance between the sixth wall portion 146 and the fourth wall 122 is a2, and a distance between the fifth wall portion 145 and the second wall 121 is b2, where a2 > b2. By providing the second protruding ribs 149, the contact area between the fluid within the second hole channel 125 and the second tube body 12 is increased, and the heat exchange effect of the flat tube 1 is improved.

[0020] In some embodiments, as shown in FIG. 4 to FIG. 7, the first tube body 11 includes a fifth wall 113 and a sixth wall 114, and the multiple first hole channels 115 are located between the fifth wall 113 and the sixth wall 114 in the width direction of the first tube body 11. The fifth wall 113 connects the third wall 111 and the first wall 112, and the sixth wall 114 connects the third wall 111 and the first wall 112. The second tube body 12 includes a seventh wall 123 and an eighth wall 124, and the multiple second hole channels 125 are located between the seventh wall 123 and the eighth wall 124 in the width direction of the second tube body 12. The seventh wall 123 connects the second wall 121 and the fourth wall 122, and the eighth wall 124 connects the second wall 121 and the fourth wall 122. As shown in the drawings, each of the fifth wall 113, the sixth wall 114, the seventh wall 123 and the eighth wall 124 in this embodiment includes a straight section and a curved section, or of course, each of them may only include the straight section or the curved section. As shown in FIG. 4 and FIG. 6, in the width direction of the first tube body 11, a distance between the wall 13 forming the first hole channel 115 adjacent to the fifth wall 113 and the fifth wall 113 is defined as d1, where d1 > b1 . In the width direction of the second tube body 12, a distance between the wall 14 forming the second hole channel adjacent to the seventh wall 123 and the seventh wall 123 is defined as d3, where d3 > b2. As shown in FIG. 5 and FIG. 7, a distance between the wall 13 forming the first hole channel adjacent to the sixth wall 114 and the sixth wall 114 is defined as d2, where d2 > b1 . A distance between the wall 14 forming the second hole channel adjacent to the eighth wall 124 and the eighth wall 124 is defined as d4, where d4 > b2. The fifth wall 113, the sixth wall 114, the seventh wall 123 and the eighth wall 124 are all external surfaces of the flat tube 1. By controlling the magnitudes of d1 , d2, d3 and d4, the strength of the flat tube 1 can be improved.

[0021] In some embodiments, as shown in FIG. 5, FIG. 6 and FIG. 7, the first hole channel 115 and the second hole channel 125 are aligned in the thickness direction of the tube body, so that the first tube body 11 and the second tube body 12 may be arranged in the same structure, which is convenient for processing. As shown in FIG. 4, the first hole channel 115 and the second hole channel 125 are staggered in the thickness direction of the tube body, so the compactness of the flat tube 1 may be improved.

[0022] As shown in FIG. 8 to FIG. 14, a heat exchange core 10 includes a first collecting assembly 2, a second collecting assembly 3 and multiple flat tubes 1. Each of the multiple flat tubes 1 is the flat tube 1 mentioned above, and the structure of the flat tube 1 is not be described here. As shown in FIG. 8, the direction H is also a height direction of the heat exchange core 10. The flat tube 1 includes a first end 110 and a second end 120 (shown in FIG. 1) in the length direction of the flat tube 1, the first end 110 of the flat tube 1 is connected to the first collecting assembly 2, and the second end 120 of the flat tube 1 is connected to the second collecting assembly 3. Each of the first collecting assembly 2 and the second collecting assembly 3 includes at least one chamber, and the first hole channel 115 and the second hole channel 125 of the flat tube 1 are communicated with the at least one chamber of the first collecting assembly 2, and the first hole channel 115 and the second hole channel 125 of the flat tube 1 are communicated with the at least one chamber of the second collecting assembly 3. The heat exchange core 10 has a first fluid passage, the first hole channel 115, the second hole channel 125, at least a portion of the chamber of the first collecting assembly 2 and at least a portion of the chamber of the second collecting assembly 3 are at least part of the first fluid passage.

[0023] As shown in FIG. 8, the multiple flat tubes 1 are arranged in two groups in a width direction of the heat exchange core 10, and each group has multiple flat tubes 1 arranged in the height direction of the heat exchange core 10. The first end 110 of each flat tube 1 is connected to the first collecting assembly 2, and the second end 120 of each flat tube 1 is connected to the second collecting assembly 3. Specifically, as shown in FIG. 13, the first collecting assembly 2 includes five plates, namely one first plate 21, three second plates 22 and one third plate 23; the three second plates 22 are located between the first plate 21 and the third plate 23. The first plate 21 has multiple first through-holes 211 and multiple second through-holes 212, the multiple first through-holes 211 are arranged in the height direction of the heat exchange core 10, and the multiple second through-holes 212 are arranged in the height direction of the heat exchange core 10; and the first through-holes 211 and the second through-hole 212 are arranged in the width direction of the heat exchange core 10. The first through-holes 211 are used for being inserted by the first ends 110 of one group of flat tubes 1, and the second through-holes 212 are used for by inserted by the first ends 110 of another group of flat tubes 1. As shown in FIG. 1, the first ends 110 of the flat tubes 1 adopt a necking structure, which is convenient for controlling a depth of the flat tube 1 inserting into the first plate 21. The second plate 22 has multiple first through-holes 221, second through-holes 222 and third through-holes 223, the multiple first through-holes 221 and second through-holes 222 of the second plate 22 are arranged in one-to-one correspondence with some of the first through-holes 211 and some of the second through-holes 212 of the first plate 21; the third through-hole 223 communicates the first through-hole 211 of the first plate 21 with the second through-hole 212 of the first plate 21. The third plate 23 has a first passage 231, a second passage 232, a first aperture 233 and a second aperture 234. The first aperture 233 communicates the first passage 231 with the multiple first through-holes 221 of the second plate 22, and the second aperture 234 communicates the second passage 232 with the multiple second through-holes 222 of the second plate 22. As shown in FIG. 14, the second collecting assembly 3 includes five plates, namely one fourth plate 31, one fifth plate 32, two sixth plates 33 and one seventh plate 34. The fourth plate 31 is a flat plate, and the fifth plate 32 has multiple fourth through-holes 321 extending in the height direction of the heat exchange core 10. The sixth plate 33 has multiple fifth through-holes 331 and multiple sixth through-holes 332, the multiple fifth through-holes 331 are arranged in the height direction of the heat exchange core 10, and the multiple sixth through-holes 332 are arranged in the height direction of the heat exchange core 10; and the fifth through-hole 331 and the sixth through-hole 332 are arranged in the width direction of the heat exchange core 10. The seventh plate 34 has multiple seventh through-holes 341 provided in one-to-one correspondence with the fifth through-holes 331 of the sixth plate 33, and multiple eighth through-holes 342 provided in one-to-one correspondence with the sixth through-holes 332. The multiple seventh through-holes 341 are used for being inserted by the second ends 120 of one group of flat tubes 1, and the multiple eighth through-holes 342 are used for being inserted by the second ends 120 of another group of flat tubes 1. As shown in FIG. 1, the second ends 120 of the flat tubes 1 adopt a necking structure, which is convenient for controlling a depth of the flat tube 1 inserting into the seventh plate 34. When the fluid flows into the first passage 231, it flows from the first aperture 233 into the multiple first through-holes 221 of the second plate 22, flows through the flat tube 1 and then into the second collecting assembly 3, and then flows from some of the fifth through-hole 331 of the sixth plate 33 into some of the fourth through-holes 321 of the fifth plate 32. The fluid flows downwardly along the fourth through-holes 321 into some other of the first through-holes 331 of the sixth plate 33, flows through the flat tube 1 and then into the third through-holes 223 of the second plate 22 of the first collecting assembly 2. The fluid moves laterally and then flows into the other group of flat tubes 1, flows through the flat tubes 1 and then flows into some of the sixth through-holes 332 of the sixth plate 33 of the second collecting assembly 3, and then flows upwardly through some of the fourth through-holes 321 of the fifth plate 32. Then the fluid flows to some other of the sixth through-holes 332 of the sixth plate 33, flows through the flat tube 1 and then into the second through-holes 222 of the second plate 22 of the first collecting assembly 2, flows through the second aperture 234 and then into the second passage 232 of the third plate 23, and finally flows out of the heat exchange core 10. Of course, the fluid may also flow reversely; or alternatively the through-hole structure of each plate may be altered to change the flow path of the fluid.

[0024] As shown in FIG. 8 to FIG. 12, the heat exchange core 10 further includes multiple fin plates 4, each of which is located between two adjacent flat tubes 1. The multiple fin plate 4 includes multiple fin units arranged in the length direction of the flat tubes 1. Each fin unit includes a top 41, a bottom 42, a first side 43 and a second side 44. The first side 43 connects the top 41 and the bottom 42, and the second side 44 connects the bottom 42 and the top 41 of the adjacent fin unit. As shown in FIG. 12, the top 41 of one flat tube 1 is welded and fixed to the fourth wall 122 of one adjacent flat tube 1, and the bottom 42 is welded and fixed to the third wall 111 of another adjacent flat tube 1. Each of the first side 43 and the second side 44 has a notch 45, and a distance between the first tops 41 of adjacent fin units is denoted as λ, and a distance between adjacent flat tubes 1 is denoted as h, where 0.8 < λ / h < 5, and h < 2.5 mm. By reducing the height of the fin plate 4, more flat tubes 1 are provided to improve the heat exchange effect between the fluid within the flat tubes 1 and the flat tubes 1 under the premise that the height of the heat exchange core 10 remains unchanged. The heat exchange area of the fin plate 4 may be increased by controlling the distance λ between the first tops 41 of adjacent fin units.

[0025] As shown in FIG. 15- FIG. 18, a heat exchanger 100 includes a shell 5 and the above heat exchange core 10. The heat exchange core 10 is accommodated in the shell 5, and the shell 5 has a medium cavity 6 inside. The shell 5 includes a first body 51 and a second body 52, which are fixed to each other for hermetical sealing. The second shell 52 has a first connection duct 521 and a second connection duct 522, which are communicated with the medium cavity 6. The heat exchanger 100 has a second fluid passage, the first fluid passage is not communicated with the second fluid passage, and the medium cavity 6 is at least part of the second fluid passage. The fluid may flow into the medium cavity 6 from the first connection duct 521, flow through the fin plates 4 and then flow out of the second connection duct 522, so as to exchange heat with the fluid within the first fluid passage of the heat exchange core 10. Since the first connection duct 521 and the second connection duct 522 are located on one side of the heat exchanger 100 in the width direction, the multiple fin units of each fin plate 4 are arranged in the length direction of the flat tube 1, so that the pressure drop of fluid flowing through the fin plate 4 is reduced. The distance between the first tops 41 of adjacent fin units may be reduced under the condition that the pressure drop is kept constant, thereby increasing the heat exchange area of the fin plate 4 and improving the heat exchange performance.

[0026] With reference to FIG. 17 and FIG. 18, the first collecting assembly 2 includes a first cavity 24 and a second cavity 25. The shell 5 has a first port 511 and a second port 512, which are located in the first body 51, but may also be located in the second body 52. The first cavity 24 is communicated with the first port 511, and the second cavity 25 is communicated with the second port 512. In some specific embodiments, a connection block 7 is welded and fixed to the first body 51, and the connection block 7 has a first flow channel 71 communicated with the first port 511 and a second flow channel 72 communicated with the second port 512. The fluid flows from the first flow channel 71 into the first port 511 and then into the first cavity 24, flows through the flat tube 1 and into the second cavity 25, then flows into the second flow channel 72 from the second port 512, and then flows out of the second flow channel 72. Of course, the fluid may also flow in the opposite direction. As shown in FIG. 13, the first passage 231 of the third plate 23 may be used as the first cavity 24, and the second passage 232 may be used as the second cavity 25. Of course, the first collecting assembly 1 may also have other structure. In addition, the connection block 7 may not be provided, or a connection duct may be provided to be fixed to the shell 5.

[0027] In some embodiments, a portion of the heat exchange core 10 may also be placed in the shell 5. As shown in FIG. 8, the flat tube 1 and the fin plate 4 may be placed in the shell 5, and at least a portion of the first collecting assembly 2 and at least a portion of the second collecting assembly 3 are placed outside the shell 5. For example, one end of the shell 5 is fixed to the first collecting assembly 2 for hermetical sealing, and the other end of the shell 5 is fixed to the second collecting assembly 3 for hermetical sealing. Of course, the medium cavity 6 is enclosed by various ways.

[0028] It should be noted that the heat exchanger according to the present application has been introduced in detail above. Specific embodiments are used herein to explain the principle and implementation of the present application, and the descriptions of the above embodiments are only used to help understand the core idea of the present application. It should be pointed out that, for those skilled in the art, without departing from the principle of the present application, several improvements and modifications can be made to of the present application, and these improvements and modifications will also fall within the protection scope of the claims of the present application.

Claims

1. A flat tube (1) comprising a tube body, wherein the tube body at least comprises a first tube body (11) and a second tube body (12), and the first tube body (11) has a plurality of first hole channels (115), each of which extends in a length direction of the tube body, and the plurality of first hole channels (115) are arranged in a width direction of the first tube body (11); the second tube body (12) has a plurality of second hole channels (125), each of which extends in the length direction of the tube body, and the plurality of second hole channels (125) are arranged in a width direction of the second tube body (12); the first tube body (11) has a first wall (112) in a thickness direction of the first tube body (11), and the second tube body (12) has a second wall (121) in a thickness direction of the second tube body (12); the first wall (112) of the first tube body (11) and the second wall (121) of the second tube body (12) are provided to be opposite to each other, and the first wall (112) of the first tube body (11) is welded and fixed to the second wall (121) of the second tube body (12).

2. The flat tube (1) according to claim 1, wherein the first tube body (11) comprises a third wall (111); in the thickness direction of the first tube body (11), the first hole channel (115) is located between the first wall (112) and the third wall (111), and a distance between the wall (13) forming the first hole channel and the third wall (111) is defined as a1, and a distance between the wall (13) forming the first hole channel and the first wall (112) is defined as b1; and in the width direction of the first tube body (11), a distance between two adjacent first hole channels (115) is defined as c1, where the same first hole channel (115) satisfies: a1 > b1; and / or c1 < b1.

3. The flat tube (1) according to claim 1 or 2, wherein the second tube body (12) comprises a fourth wall (122); in the thickness direction of the second tube body (12), the second hole channel (125) is located between the second wall (121) and the fourth wall (122), a distance between the wall (14) forming the second hole channel and the fourth wall (122) is defined as a2, and a distance between the wall (14) forming the second hole channel and the second wall (121) is defined as b2; in the width direction of the second tube body (12), a distance between two adjacent second hole channels (125) is defined as c2 , where the same second hole channel (125) satisfies: a2 > b2; and / or c2 < b2.

4. The flat tube (1) according to claim 2, wherein the first tube body (11) comprises a fifth wall (113) and a sixth wall (114), and the plurality of first hole channels (115) are located between the fifth wall (113) and the sixth wall (114) in the width direction of the first tube body (11); the fifth wall (113) connects the third wall (111) and the first wall (112), and the sixth wall (114) connects the third wall (111) and the first wall (112); in the width direction of the first tube body (11), a distance between the wall (13) forming the first hole channel adjacent to the fifth wall (113) and the fifth wall (113) is defined as d1, and a distance between the wall (13) forming the first hole channel adjacent to the sixth wall (114) and the sixth wall (114) is defined as d2, where d1 > b1, d2 > b1.

5. The flat tube (1) according to claim 3, wherein the second tube body (12) comprises a seventh wall (123) and an eighth wall (124), and the plurality of second hole channels (125) are located between the seventh wall (123) and the eighth wall (124) in the width direction of the second tube body (12); the seventh wall (123) connects the second wall (121) and the fourth wall (122), and the eighth wall (124) connects the second wall (121) and the fourth wall (122); in the width direction of the second tube body (12), a distance between the wall (14) forming the second hole channel adjacent to the seventh wall (123) and the seventh wall (123) is defined as d3, and a distance between the wall (14) forming the second hole channel adjacent to the eighth wall (124) and the eighth wall (124) is defined as d4, where d3 > b2, d4 > b2.

6. The flat tube (1) according to any one of claims 1 to 5, wherein the first hole channel (115) and the second hole channel (125) are staggered in the thickness direction of the tube body.

7. The flat tube (1) according to any one of claims 1 to 5, wherein the wall (13) forming the first hole channel comprises a first straight wall portion (131) and a first curved wall portion (134), which protrudes toward the third wall (111), and the first straight wall portion (131) is closer to the first wall (112) than the first curved wall portion (134); in the thickness direction of the first tube body (11), a distance between the first straight wall portion (131) and the first wall (112) is smaller than a distance between the first curved wall portion (134) and the third wall (11); and / or, the wall (14) forming the second hole channel comprises a second straight wall portion (141) and a second curved wall portion (144), which protrudes toward the fourth wall (122), and the second straight wall portion (141) is closer to the second wall (121) than the second curved wall portion (144); in the thickness direction of the second tube body 12, a distance between the second straight wall portion (141) and the second wall (121) is smaller than a distance between the second curved wall portion (144) and the fourth wall (122).

8. The flat tube (1) according to any one of claims 1 to 5, wherein the wall (13) forming the first hole channel comprises a first wall portion (135), a second wall portion (136), a third wall portion (137) and a fourth wall portion (138), wherein the first wall portion (135) and the second wall portion (136) are arranged in the thickness direction of the first tube body (11), and the third wall portion (137) and the fourth wall portion (138) are arranged in the width direction of the first tube body (11); the third wall portion (137) connects the first wall portion (135) and the second wall portion (136), and the fourth wall portion (138) connects the first wall portion (135) and the second wall portion (136), and the first wall portion (135) is closer to the third wall (111) than the second wall portion (136); in the thickness direction of the first tube body (11), a distance between the first wall portion (135) and the third wall (111) is greater than a distance between the second wall portion (136) and the first wall (112); the first wall portion (135) is provided with a first rib (139) protruding toward the second wall portion (136), and the second wall portion (136) is provided with a first rib (139) protruding toward the first wall portion (135); and / or, the wall (14) forming the second hole channel comprises a fifth wall portion (145), a sixth wall portion (146), a seventh wall portion (147) and an eighth wall portion (148), wherein the fifth wall portion (145) and the sixth wall portion (146) are arranged in the thickness direction of the second tube body (12), and the seventh wall portion (147) and the eighth wall portion (148) are arranged in the width direction of the second tube body (12); the seventh wall portion (147) connects the fifth wall portion (145) and the sixth wall portion (146), and the eighth wall portion (148) connects the fifth wall portion (145) and the sixth wall portion (146), and the fifth wall portion (145) is closer to the second wall (121) than the sixth wall portion (146); in the thickness direction of the second tube body (12), a distance between the fifth wall portion (145) and the second wall (121) is smaller than a distance between the sixth wall portion (146) and the fourth wall (122); the fifth wall portion (145) is provided with a second rib (149) protruding toward the sixth wall portion (146), and the sixth wall portion (146) is provided with a second rib (149) protruding toward the fifth wall portion (145).

9. A heat exchange core (10) comprising a first collecting assembly (2), a second collecting assembly (3) and a plurality of flat tubes (1), wherein each of the plurality of flat tubes (1) is the flat tube (1) according to any one of claims 1 to 8, and the flat tube (1) comprises a first end (110) and a second end (120) in the length direction of the flat tube (1), the first end (110) of the flat tube (1) is connected to the first collecting assembly (2), and the second end (120) of the flat tube (1) is connected to the second collecting assembly (3); each of the first collecting assembly (2) and the second collecting assembly (3) comprises at least one chamber, and the first hole channel (115) and the second hole channel (125) of the flat tube (1) are both communicated with the at least one chamber of the first collecting assembly(2), and the first hole channel (115) and the second hole channel (125) of the flat tube (1) are both communicated with at least one chamber of the second collecting assembly (3); the heat exchange core (10) has a first fluid passage, wherein the first hole channel (115), the second hole channel (125), at least a portion of the chamber of the first collecting assembly (2) and at least a portion of the chamber of the second collecting assembly (3) are at least part of the first fluid passage.

10. The heat exchange core (10) according to claim 9, further comprising a plurality of fin plates (4), each of which is located between two adjacent flat tubes (1), wherein the fin plate (4) comprise a plurality of fin units arranged in the length direction of the flat tube (1); each of the fin unit comprises a top (41) connected to the fourth wall (122) of one of two adjacent flat tubes (1), a bottom (42) connected to the third wall (111) of the other flat tube (1), a first side (43) connecting the top (41) and the bottom (42), and a second side (44) connecting the bottom (42) and the top (41) of the adjacent fin unit, and each of the first side (43) and the second side (44) is provided with a notch (45); a distance between the tops (41) of two adjacent fin units is denoted as λ, and a distance between the adjacent flat tubes (1) is denoted as h, where 0.8 < λ / h < 5.

11. A heat exchanger (100) comprising a shell (5) and a heat exchange core (10), wherein the heat exchange core (10) is the heat exchange core (10) according to claim 9 or 10, and the shell (5) is hermetically fixed to the first collecting assembly (2), and the shell (5) is hermetically fixed to the second collecting assembly (3), and a medium cavity (6) is provided in the shell (5); the heat exchanger (100) has a second fluid passage, wherein the first fluid passage is not communicated with the second fluid passage, and the medium cavity (6) is at least part of the second fluid passage.

12. A heat exchanger (100) comprising a shell (5) and a heat exchange core (10) accommodated in the shell (5), wherein the heat exchange core (10) is the heat exchange core (10) according to claim 9 or 10, and the shell (5) comprises a first body (51) and a second body (52), which are hermetically fixed to each other; the first collecting assembly (2) comprises a first cavity (24) and a second cavity (25); the shell (5) has a first port (511) and a second port (512), wherein the first cavity (24) is communicated with the first port (511), and the second cavity (25) is communicated with the second port.

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