A method for manufacturing a composite aluminum pipe and a heat exchanger having the same

Abstract

This application discloses a method for manufacturing a composite aluminum tube, which includes the following steps: rolling a composite aluminum plate with a preset width so that the rolled composite aluminum plate can achieve a preset shape; the composite aluminum plate includes a first core layer and a first solder layer; in the thickness direction of the composite aluminum plate, the first solder layer is located on at least one side of the first core layer; welding the rolled composite aluminum plate to obtain a second tube body after welding; the second tube body has a cavity. Using the manufacturing method of the composite aluminum tube provided in this application is beneficial to improving the welding reliability of the composite aluminum tube.

Description

Technical Field

[0001] This application relates to the field of heat exchange tube manufacturing, specifically to a method for manufacturing a composite aluminum tube for use in the air conditioning field and a heat exchanger having the composite aluminum tube. Background Technology

[0002] In related technologies, copper tube heat exchangers consist of copper heat exchange tubes and aluminum fins. The copper heat exchange tubes and aluminum fins are fixed together by an expansion joint process, with the copper heat exchange tubes penetrating the aluminum fins. In some applications, to reduce costs, aluminum heat exchange tubes are used instead of copper heat exchange tubes, and solder is applied to the surface of the fins. The heat exchange tubes and fins are fixed by welding, and some solder flows down from the fin surface and collects on the local surface of the heat exchange tubes, causing local solder accumulation. Due to the high temperature during the heat exchanger manufacturing process, there is a risk of erosion at the connection between the heat exchange tubes and fins, affecting the reliability of the heat exchange tubes. Summary of the Invention

[0003] Therefore, this application proposes a method for manufacturing composite aluminum tubes, which improves the reliability of composite aluminum tubes.

[0004] This application proposes a method for manufacturing a composite aluminum tube, including the following steps: rolling a composite aluminum plate (1) with a preset width so that the rolled composite aluminum plate (1) can achieve a preset shape, wherein the composite aluminum plate includes a first core material layer and a first solder layer, and in the thickness direction of the composite aluminum plate, the first solder layer is located on at least one side of the first core material layer.

[0005] The rolled composite aluminum sheet is welded to obtain the first tube, which has a cavity.

[0006] The first tube is inserted into a drawing die with a preset size hole, and the first tube is processed into a second tube under the action of tension. The equivalent diameter of the second tube is smaller than that of the first tube.

[0007] According to the manufacturing method of composite aluminum tube proposed in this application, a first tube body is obtained by rolling and welding a composite aluminum plate, and a second tube body is obtained by drawing the first tube body. The equivalent diameter of the second tube body is smaller than that of the first tube body, which is beneficial to obtain a second tube body with a smaller diameter than the first tube body. Since the outermost side of the tube wall of the second tube body has a second solder layer, the welding reliability of the composite aluminum tube can be improved.

[0008] Another aspect of this application discloses a method for manufacturing composite aluminum tubes, comprising the following steps:

[0009] A composite aluminum plate with a preset width is rolled so that the rolled composite aluminum plate can achieve a preset shape. The composite aluminum plate includes a first core material layer and a first solder layer. In the thickness direction of the composite aluminum plate, the first solder layer is located on at least one side of the first core material layer.

[0010] The rolled composite aluminum sheet is welded to obtain a second tube, which has a cavity.

[0011] According to the embodiment of this application, a method for manufacturing a composite aluminum tube is proposed, in which a composite aluminum plate is rolled and then welded to obtain a second tube body. Since the outermost side of the tube wall of the second tube body has a second solder layer, the welding reliability of the composite aluminum tube can be improved.

[0012] Another aspect of this application provides a heat exchanger comprising a plurality of composite aluminum tubes and fins. The fins include through holes penetrating the fins. The plurality of composite aluminum tubes are spaced apart along the length of the fins and penetrate the through holes. Each composite aluminum tube includes a tube wall, the tube wall including a second core material layer. A portion of the second solder is present between the connection between the fins and the composite aluminum tubes, and / or a portion of the second solder is present on the outer side of a portion of the composite aluminum tube located between two adjacent fins.

[0013] According to the heat exchanger of the present application embodiment, since the outer wall of the composite aluminum tube has a second solder layer, the second solder layer on the outer surface of the composite aluminum tube melts into a liquid state at high temperature and solidifies into a solid state at room temperature, thereby achieving the welding and fixing of the composite aluminum tube and the fins. By eliminating the setting of solder on the fin surface and setting solder on the surface of the composite aluminum tube, the flow and accumulation of solder on the fin surface and its penetration into the connection between the fin and the heat exchange tube can be reduced at high temperature. Therefore, the solder penetration at the connection between the fin and the heat exchange tube is reduced, which helps to reduce the risk of erosion at the connection between the heat exchange tube and the fin and improves the reliability of the heat exchanger. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a composite aluminum plate according to an embodiment of this application.

[0015] Figure 2 This is a schematic diagram of the cross-section of the composite aluminum plate according to an embodiment of this application.

[0016] Figure 3 This is a schematic diagram illustrating the process of pressing patterns onto a composite aluminum plate according to an embodiment of this application.

[0017] Figure 4 yes Figure 3 Schematic diagram of the texture structure obtained by the processing method shown.

[0018] Figure 5This is a schematic diagram illustrating another embodiment of the present application of the process of pressing textures onto a composite aluminum plate.

[0019] Figure 6 yes Figure 5 Schematic diagram of the texture structure obtained by the processing method shown.

[0020] Figure 7 This is another schematic diagram of the processing of pressing patterns on a composite aluminum plate according to an embodiment of this application.

[0021] Figure 8 yes Figure 7 Schematic diagram of the texture structure obtained by the processing method shown.

[0022] Figure 9 This is a schematic diagram of the process of rolling a composite aluminum plate into a first tube according to an embodiment of this application.

[0023] Figure 10 This is a schematic diagram of the welding process of the first pipe body in the embodiment of this application.

[0024] Figure 11 This is a schematic diagram of the first deburring process of the first tube body in the embodiments of this application.

[0025] Figure 12 This is a schematic diagram of the second deburring process of the first tube body in the embodiments of this application.

[0026] Figure 13 This is a schematic diagram of infrared detection of the welding quality of the first pipe body according to an embodiment of this application.

[0027] Figure 14 This is a schematic diagram of the structure of a first tube according to an embodiment of this application.

[0028] Figure 15 yes Figure 14 A schematic diagram of the cross-section of the first tube shown.

[0029] Figure 16 This is a schematic diagram of the first tube being inserted into the inlet of the mobile device in a stationary state according to an embodiment of this application.

[0030] Figure 17 This is a schematic diagram of the first tube body in the pulling state according to the embodiment of this application.

[0031] Figure 18 This is a schematic diagram of the structure of a second tube body according to an embodiment of this application.

[0032] Figure 19 yes Figure 18 A schematic diagram of the cross-section of the second tube shown.

[0033] Figure 20 This is a schematic diagram of one of the composite aluminum plate structures in an embodiment of this application.

[0034] Figure 21 This is a schematic diagram of the structure of another composite aluminum plate after cutting, according to an embodiment of this application.

[0035] Figure 22 yes Figure 20 and Figure 21 A schematic diagram of the composite aluminum plate rolling process.

[0036] Figure 23 This is a schematic diagram of another method for pressing patterns onto a composite aluminum plate according to an embodiment of this application.

[0037] Figure 24 This is a schematic diagram of the structure of another first tube body according to an embodiment of this application.

[0038] Figure 25 This is a schematic diagram of the structure of another second tube in an embodiment of this application.

[0039] Figure 26 yes Figure 25 The diagram shows a cross-sectional view of the second tube in the AA direction.

[0040] Figure 27 This is a schematic diagram of the composite aluminum tube structure according to an embodiment of this application.

[0041] Figure 28 yes Figure 27 The schematic diagram of the composite aluminum tube shown is as follows.

[0042] Figure 29 This is a schematic diagram of a heat exchanger structure according to an embodiment of this application.

[0043] Figure 30 yes Figure 29 The heat exchanger shown is a schematic cross-sectional view along the BB direction.

[0044] Reference numerals: 1. Composite aluminum plate; 111. First solder layer; 112. First protective material; 113. First core material layer; 11. First protrusion; 111. First toothed surface; 12. Second protrusion; 121. Second toothed surface; 13. Joint; 14. First side surface; 15. Second side surface; 16. Cut surface; 19. Copper coil; 21. First tube body; 211. First solder layer; 212. First protective material; 213. First core material layer; 214. First wall; 215. First cavity; 22. Second tube body; 2. Tube wall ; 20 Body; 221 Second solder layer; 222 Second protective material; 223 Second core material layer; 224 Second tube wall; 225 Second tube cavity; 31 First deburring tool; 32 Second deburring tool; 4 Embossing roller; 5 Roller; 6 Correction roller; 7 Drawing die; 8 Moving equipment; 9 Lead screw; 10 Fins; 100 Heat exchanger; 101 Detector; 102 Electronic display screen; 1001 Through hole; 104 Connecting pipe; 105 Composite aluminum tube; 1051 Tube wall; 106 Fins Detailed Implementation

[0045] To better understand the technical solutions of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0046] The manufacturing method of a composite aluminum tube according to an embodiment of this application includes multiple processes, specifically, such as... Figures 1 to 3 As shown, Figure 1 The diagram shows composite aluminum plate 1. Figure 2 The diagram shows a cross-sectional view of the composite aluminum plate 1, which includes a first solder layer 111 and a first core material layer 113. In some designs, the composite aluminum plate 1 may also include a first protective material 112.

[0047] In some embodiments, to increase the heat exchange area of ​​the composite aluminum tube, embossing is performed on one side of the composite aluminum plate in the thickness direction. Specifically, for example... Figures 3 to 8 As shown, a plurality of first protrusions 11 are pressed onto one side of the composite aluminum plate 1 using an embossing roller 4. At least some of the first protrusions 11 are inclined relative to the length direction of the composite aluminum plate 1, and the extension direction of at least some of the first protrusions is parallel to the width direction of the composite aluminum plate 1. Figure 1 The included angle α between the Z direction shown is greater than or equal to 20 degrees and less than or equal to 40 degrees.

[0048] Furthermore, in some embodiments, as shown in 9, the flattened composite aluminum plate 1 is rolled by rollers 5, wherein the composite aluminum plate 1 is placed with the first solder layer 111 facing downward and the first core material layer 113 facing upward. The rolled composite aluminum plate 1 can achieve a preset shape. Here, the composite aluminum plate 1 is rolled into a shape with a circular or elliptical cross-section as an implementation method. During the movement of the composite aluminum plate 1, the rollers 5 bring the two sides of the composite aluminum plate 1 inward in the width direction. It is understood that there is no requirement for the number of sets of rollers 5. Multiple sets of rollers 5 can be set on the production line. In this way, by gradually adjusting the forming process 1 of the composite plate 1 from plate to tube, the degree of deformation of the composite aluminum plate 1 during the manufacturing process can be reduced, and the reliability of the finished composite aluminum tube can be improved.

[0049] After being rolled, the composite aluminum plate 1 becomes a prefabricated composite aluminum tube. The prefabricated composite aluminum tube has a weld seam 13. In some embodiments, in order to improve the accuracy of the prefabricated composite aluminum tube, a correction wheel 6 is used to correct the prefabricated composite aluminum tube, so that the weld seam 13 is narrowed, and the structure of the prefabricated composite aluminum tube can be closer to the structure of the finished composite aluminum tube.

[0050] In one embodiment of this application, a composite aluminum tube is prefabricated and welded using high-frequency welding to obtain a first tube body 11. Specifically, as shown... Figure 10 As shown, the prefabricated composite aluminum tube 10 passes through a copper coil 19 composed of copper wires. The copper coil 19 generates heat when energized. The joint 16 of the prefabricated composite aluminum tube 10 located inside the copper coil 19 is welded together, and the first tube body 11 is obtained after welding.

[0051] After welding, the temperature of the first tube 11 is high, so it is necessary to cool the first tube 11. The cooling method can be liquid cooling or other methods, without too many restrictions. The first tube 11 can be placed in a cooling tank filled with coolant to achieve cooling.

[0052] Next, when processing the burrs on the outer surface of the weld 13 of the first pipe body 21, the process includes a deburring step. To reduce damage to the first pipe body 21, the deburring can be divided into two or more steps. It is understood that this is only an illustrative description of one embodiment and does not limit the process. Figure 11 and Figure 12As shown, the first process uses the first deburring blade 31 on the equipment to initially remove burrs from the outer surface of the first tube 21, removing most of the burrs. The second process uses the second deburring blade 32 on the equipment to further remove the remaining burrs from the outer surface of the first tube 21, making the outer surface of the first tube 21 smoother. By using these two processes to treat the burrs, the precision of deburring can be better controlled, ensuring that the first tube 21 is not easily scratched by the blades.

[0053] In some embodiments, such as Figure 13 As shown, damage detection is performed on the first tube 11 after deburring to detect whether the tube is damaged. The detection method can be infrared detection or other methods. The detection system detects whether the tube 11 is broken. The detection system detects the first tube 11, compares the information collected on the first tube 11 with the pre-stored information, and issues feedback information based on the comparison result. If the comparison result finds that the tube diameter is broken, the electronic display screen of the detection system shows the location of the break on the tube, and the detection system issues a prompt sound to remind that the tube segment is broken. The next step is to cut off the part of the tube segment including the broken location. If the first tube 11 is not broken, the first tube 11 continues to move forward.

[0054] The first tube 21, after damage detection, is sent into the length sensing device. The required tube length is set in the sensing device. As the first tube 21 moves through the sensing device, the sensing device records the initial position of the first tube in the system. After the sensing device records the information, the first tube 21 enters the cleaning tank for cleaning to remove aluminum shavings and dust from the first tube 21.

[0055] Next, the first tube 21 is degreased by using a cleaning agent with degreasing properties to remove the oil stains on the surface of the first tube 21, or by baking the first tube 21 at high temperature to evaporate the lubricating oil and other oil stains on the surface of the first tube 21.

[0056] When the sensing device detects that the initial position of the first tube 11 has moved to the preset target position according to the set value, it cuts the first tube 21. Specifically, the processing equipment is equipped with an upper cutting blade and a lower cutting blade or only one cutting blade. When the first tube 21 moves on the equipment, the cutting blade cuts the first tube 21 according to the markings on the first tube 21 to cut the first tube 21 into at least one tube segment of a set length.

[0057] In some embodiments, in order to improve the liquid turbulence inside the composite aluminum tube when it is used as a heat exchange tube in refrigeration or heating conditions, multiple first protrusions with a main material layer are placed on the composite aluminum plate 1 before the composite aluminum plate is rolled to improve the heat exchange performance of the composite aluminum tube under the application conditions.

[0058] In some designs, in order to manufacture composite aluminum tubes with a diameter of less than or equal to 5 mm, the inventors thought that they could manufacture composite aluminum tubes with a diameter of greater than or equal to 7 mm by drawing. In the embodiments of this application, taking the first tube body with a diameter of 7 mm and the second tube body 22 with a diameter of 5 mm as an example, the composite aluminum tube with a diameter of 7 mm is drawn to obtain a composite aluminum tube with a diameter of 5 mm.

[0059] In some embodiments, the cut-off first tube 21 is subjected to a drawing process, specifically, as shown in the example below. Figures 14 to 19 As shown, the drawing die 7 contacts the moving device 8. The drawing die 7 has a die hole 71 with a predetermined diameter. The moving device 8 has a fixing device 81. The end of the first tube 21 is inserted into the die hole 71 of the drawing die 7. The diameter of the die hole 71 is preset. The end of the first tube 21 passes through the die hole. The connecting part 81 of the moving device 8 is fixedly connected to the end of the first tube 21. Under the action of the lead screw 9, the moving device 8 pulls the die hole of the first tube 21 through the entire drawing die 71 to obtain a second tube 22 with a relatively small diameter. The diameter of the second tube 22 is D2, and the diameter of the first tube 21 is D1. D2 is less than D1. The first protrusion 11 on the first tube 21 is deformed after drawing to form a second protrusion 12. The height of the first protrusion 11 is h1, and the height of the second protrusion 21 is h2. h2 is less than h1.

[0060] In some embodiments, a method for manufacturing a composite aluminum tube includes: rolling a composite aluminum plate 1 having a preset width so that the rolled composite aluminum plate 1 can achieve a preset shape; the composite aluminum plate 1 includes a first core layer 113 and a first solder layer 111; in the thickness direction of the composite aluminum plate 1, the first solder layer 111 is located on at least one side of the first core layer 113; after welding, a first tube body 21 is obtained; the first tube body 21 has a cavity; after welding, the first tube body 11 is cooled; and then the first tube body... 11. The detection method is to compare the information used with the pre-stored information and issue feedback information based on the comparison result. The operator makes corresponding processing based on the feedback information. After processing, the first tube 21 is inserted into the drawing die 7 with a pre-set size die hole. The first tube 21 is processed into the second tube 22 under the pulling force of the mobile device 8. The equivalent diameter of the second tube 22 is smaller than the equivalent diameter of the first tube 21. The second tube 22 is straightened and cut off according to the first pre-set length.

[0061] Here, the specific details of the same steps in the various embodiments of this application will not be repeated.

[0062] In some embodiments, such as Figure 27 and Figure 28 As shown, the composite aluminum tube 105 includes a tube wall 2, which includes a body portion 20. The body portion 20 includes a second solder layer 221 and a second core material layer 223 in the thickness direction of the tube wall 2. The second solder layer 221 is located outside the first core material layer 223, and the thickness of the second solder layer 221 is h1, while the thickness of the second core material layer 223 is h3, wherein 0.02 ≤ h1 / h3 ≤ 0.11.

[0063] The composite aluminum tubes within the above range enable the composite aluminum tube 105 to achieve optimal welding performance and pressure resistance.

[0064] Furthermore, the body part 22 also includes a second protective material (222), which is located outside the second core material layer (223) and inside the second solder layer (221). The thickness of the second protective material (222) is h2, and the thickness of the second core material layer (223) is h3, wherein 0.012≤h2 / h3≤0.058.

[0065] The composite aluminum tubes within the above range enable the composite aluminum tube 105 to achieve optimal corrosion resistance and pressure resistance.

[0066] In some embodiments, such as Figure 20 As shown, the composite aluminum plate 1 has a first side 14 and a second side 15 arranged parallel to each other in the thickness direction of the composite aluminum plate 1. The dimension of one of the first side (14) and the second side (15) in the width direction of the composite aluminum plate (1) is smaller than the dimension of the other side in the width direction of the composite aluminum plate (1), so that the inner wall surface of the prefabricated composite aluminum tube will not be squeezed and bulge during the tube rolling process.

[0067] In some embodiments, such as Figure 21 and Figure 22 As shown, Figure 21 This diagram illustrates the cross-section of a composite aluminum plate 1 after it has been cut or extruded. Figure 22The diagram illustrates the rolling and gathering of both ends. The dotted lines indicate the parts removed after processing. The composite aluminum plate 1 has a first side 14 and a second side 15 arranged parallel to each other in the thickness direction of the composite aluminum plate 1. Before pressing the first protrusion 11 of the texture on the composite aluminum plate 1, at least one end of the composite aluminum plate 1 is cut in the width direction to form a cutting surface 16. The cutting surface 16 is arranged obliquely from one of the first side 14 and the second side 15 toward the other side. The dimension of one of the first side 14 and the second side 15 in the width direction of the composite aluminum plate 1 is smaller than the dimension of the other side in the width direction of the composite aluminum plate 1.

[0068] Specifically, at least one end of the composite aluminum plate 1 in the width direction is cut from the first side 14 toward the second side 15 along the thickness direction of the composite aluminum plate 1 to form a cut surface 16 at at least one end of the composite aluminum plate 1 in the width direction, such that the dimension of the first side 14 in the width direction of the composite aluminum plate 1 is smaller than the dimension of the second side 15 in the width direction of the composite aluminum plate 1.

[0069] When pressing the texture onto the composite aluminum plate 1, the first protrusion 11 is pressed onto the first side surface 14, and then the composite aluminum plate 1 is rolled. The first side surface 14 becomes the inner wall surface of the prefabricated composite aluminum tube, so that the inner wall surface of the prefabricated composite aluminum tube will not be squeezed and bulge during the rolling process.

[0070] It is understandable that when rolling the composite aluminum plate 1, in order to prevent bulging, the method is not limited to the one described above.

[0071] In some embodiments, the composite aluminum plate 1 has a first side 14 and a second side 15 arranged parallel to each other in the thickness direction of the composite aluminum plate 1. Before pressing the first protrusion 11 of the texture on the composite aluminum plate 1, the composite aluminum plate 1 is placed into a shaping mold. The shaping mold is used to extrude the composite aluminum plate 1 so that the dimension of either the first side 14 or the second side 15 in the width direction of the composite aluminum plate 1 is smaller than the dimension of the other side in the width direction of the composite aluminum plate 1.

[0072] Specifically, the composite aluminum plate 1 is placed in a shaping mold, and the first side 14 in the thickness direction of the composite aluminum plate 1 is pressed by the shaping mold so that the dimension of the first side 14 in the width direction of the composite aluminum plate 1 is smaller than the dimension of the second side 15 in the width direction of the composite aluminum plate 1. Using this method, the operation is simple and it is also easy to prevent the inner wall surface of the prefabricated composite aluminum tube from being squeezed and bulging during the tube rolling process.

[0073] In some embodiments, such as Figures 23 to 26As shown, the composite aluminum plate (1) is processed within the second preset length A1, such that a portion of the composite aluminum plate 1 within the second preset length region has the first protrusion 11 on at least one side in the thickness direction of the composite aluminum plate. Then, the processing of the composite aluminum plate 1 is stopped. After the composite aluminum plate 1 moves forward in the length direction of the composite aluminum plate 1 by a third preset length A2, the two steps of processing the composite aluminum plate 1 within the second preset length A1 and stopping the processing of the composite aluminum plate 1 at the third preset length A2 are repeated.

[0074] In some embodiments, when pressing patterns on the composite aluminum plate 1, it is not limited to pressing discontinuous patterns on the composite aluminum plate 1 as described above. For example, the embossing roller 4 of the embossing mold continuously presses patterns on the first side 14 of the composite aluminum plate 1 along the width direction of the composite aluminum plate 1 to form continuous patterns.

[0075] Specifically, after the embossing roller 4 presses the texture onto the composite aluminum plate 1 within the second preset length A1, the embossing roller 4 is separated from the composite aluminum plate 1, causing the embossing roller 4 and the composite aluminum plate 1 to separate. The composite aluminum plate 1 moves forward by the third preset length A2 in the length direction of the composite aluminum plate 1, so that the second preset length A1 and the second preset area A2 are alternately arranged in the width direction of the composite aluminum plate 1. When pressing the first protrusion 11 of the texture on the composite aluminum plate 1, after pressing the first protrusion 11 of the texture on the composite aluminum plate 1 at the second preset length 17, the second preset area A2 of the composite aluminum plate 1 is moved along the length direction of the composite aluminum plate 1, and the first protrusion 11 of the texture is pressed on the next second preset length 17.

[0076] When pressing patterns onto the composite aluminum plate 1, the composite aluminum plate 1 is placed on the pressing pattern mold and can move along the width direction of the composite aluminum plate 1 on the pressing pattern mold. The first side 14 of the composite aluminum plate 1 faces the pressing roller 4 on the pressing pattern mold, and the pressing roller 4 has patterns on it. When the composite aluminum plate 1 moves, when the second preset length 17 on the first side 14 corresponds to the pressing roller 4, the pressing roller 4 presses the first protrusion 11 of the pattern at the second preset length 17. When the third preset length on the first side 14 corresponds to the pressing roller 4, the pressing roller 4 is lifted and no longer presses patterns on the second preset area 18.

[0077] Furthermore, a composite aluminum plate with alternating areas of pressed first protrusion 11 and unpressed first protrusion 11 is rolled and welded to obtain a first tube 21. After the first tube 21 undergoes multiple processes such as damage detection, cutting, and drawing, a second tube 22 is obtained, as shown below. Figures 24 to 26 As shown, Figure 24The diagram illustrates a first tube 21 without first protrusions 11 at both ends. In a second tube 22, the length of the section with the first protrusions 12 is L1, and the length of the second tube 22 is L2, where L1 is less than L2. Figure 25 The diagram shows a second tube body 22 without second protrusions 12 at both ends. In a second tube body 22, the length of the tube segment with second protrusions 12 is L3, and the length of the tube body 22 is L4, where L3 is less than L4. Figure 26 This is a cross-sectional view of the first tube 21 in the AA direction.

[0078] In some embodiments, before rolling the composite aluminum plate 1 with a preset width, the composite aluminum plate is further rolled by rolling the first core layer ingot and the first solder layer ingot. Specifically, the first core layer ingot is 1XXX series pure aluminum alloy or 3XXX series aluminum alloy, the second solder layer ingot is 4XXX series aluminum alloy, the first core layer ingot and the first solder layer ingot are cut and milled, the milled first core layer ingot is hot rolled, and the milled first solder layer ingot is hot rolled.

[0079] Furthermore, the rolling process includes hot rolling at a temperature of 500°C. The first core layer ingot (not shown in the figure) and the first solder layer ingot (not shown in the figure) after milling are hot rolled at a high temperature of 500°C. After the stacked first core layer ingot and first solder layer ingot are hot rolled, they are then cold rolled and annealed to obtain a composite aluminum plate. The first solder layer 111 on the outer surface of the composite aluminum plate obtained in this way is arranged more evenly. As a material for manufacturing composite aluminum tubes, it is beneficial to improve the welding reliability of composite aluminum tubes.

[0080] Specifically, 1XXX series aluminum alloys represent a series of pure aluminum with a purity of over 99%, 3XXX series represents an aluminum-manganese alloy series, and 4XXX series represents an aluminum-silicon alloy series.

[0081] In another aspect, this application provides a composite aluminum tube. In some embodiments, the composite aluminum tube 105 can be obtained from the second tube body 22 after finishing, degreasing and other treatments. For the second tube body, the composite aluminum tube includes a tube wall (2), the tube wall (2) includes a body part (20), the body part (20) includes a first solder layer (221) and a first core material layer (223) in the thickness direction of the tube wall (2), the first solder layer (221) is located outside the first core material layer (223), and the ratio of the thickness of the first solder layer (221) to the thickness of the first core material layer (223) is greater than or equal to 2% and less than or equal to 11%.

[0082] 17. The composite aluminum tube according to claim 17, characterized in that the body part (22) further includes a first protective material (222), the first protective material (222) is located outside the first core material layer (223) and inside the first solder layer (221), and the ratio of the thickness of the first protective material (222) to the thickness of the first core material layer (223) is greater than or equal to 1.2% and less than or equal to 5.8%.

[0083] In some embodiments, the composite aluminum plate 1 further includes a first protective material 111, which is located between the first core layer 113 and the first solder layer 111. The first protective material 112 and the first core layer 113 are both aluminum alloys, and the corrosion potential of the first protective material 112 is less than that of the first core layer 113.

[0084] In some embodiments, such as Figure 29 and Figure 30 As shown, the heat exchanger 100 includes multiple composite aluminum tubes 105 and multiple fins 10. It is understood that the composite aluminum tubes 105 can be obtained from the second tube body 22 after finishing, degreasing, and other treatments. The composite aluminum tube 105 includes a tube wall 1051, which includes a second core material layer 223. A portion of the connection between the fins 10 and the composite aluminum tube 105 has a second solder, and / or, a portion of the outer side of the composite aluminum tube 105 located between two adjacent fins 10 has a portion of the second solder. The fins 106 have through holes 1001 penetrating the fins 106. The composite aluminum tubes 105 penetrate the fin through holes 1001. The multiple fins 10 are arranged along the length of the composite aluminum tubes 105. The heat exchanger 100 also includes a plurality of composite aluminum tubes 105, which are arranged in the length direction of the fins 106. The heat exchanger 100 also includes a connecting pipe 104, which is arranged in the length direction of the fins 106. The connecting pipe 104 has two connection ports. One end of the connecting pipe 104 is connected to one of the composite aluminum tubes 105, and the other end of the connecting pipe 104 is connected to another composite aluminum tube 105.

[0085] Under high-temperature processing, the second solder layer 221 on the outer surface of the composite aluminum tube 105 melts into a liquid state and then solidifies into a solid state at room temperature, thereby achieving the welding and fixing of the composite aluminum tube 105 and the fins 106. By setting the second solder on the surface of the composite aluminum tube 105, it is beneficial to improve the welding reliability of the composite aluminum tube 105 and the fins 106. The second solder is relatively uniform, which can reduce the solder penetration at the connection between the fins and the heat exchange tube, so as to avoid excessive solder at the connection, thereby reducing the risk of erosion of the heat exchanger 100 during the processing.

[0086] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0087] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0088] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0089] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0090] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0091] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present application.

Claims

1. A method for manufacturing a composite aluminum tube, characterized in that, Includes the following steps: A composite aluminum plate (1) with a preset width is rolled so that the rolled composite aluminum plate (1) can achieve a preset shape. The composite aluminum plate (1) includes a first core material layer (113) and a first solder layer (111). In the thickness direction of the composite aluminum plate (1), the first solder layer (111) is located on at least one side of the first core material layer (113). The rolled composite aluminum plate (1) is welded to obtain a first tube (21), which has a cavity. The first tube (21) is inserted into a die hole with a preset size in the drawing die (7). The first tube (21) passes through the die hole under the action of tension to obtain the second tube (22). The equivalent diameter of the second tube (22) is smaller than the equivalent diameter of the first tube (21).

2. A method for manufacturing a composite aluminum tube, characterized in that, Includes the following steps: A composite aluminum plate (1) with a preset width is rolled so that the rolled composite aluminum plate (1) can achieve a preset shape. The composite aluminum plate (1) includes a first core material layer (113) and a first solder layer (111). In the thickness direction of the composite aluminum plate (1), the first solder layer (111) is located on at least one side of the first core material layer (113). The rolled composite aluminum plate (1) is welded to obtain a second tube (22), which has a cavity.

3. The method for manufacturing the composite aluminum tube according to claim 1 or 2, characterized in that, The outer diameter of the second tube is less than or equal to 5 millimeters.

4. The method for manufacturing the composite aluminum tube according to claim 3, characterized in that, Before rolling the composite aluminum sheet (1) with a preset width, the following steps are also included: The first core material layer ingot and the first solder layer ingot are cut and milled. The first core material layer ingot is made of 1XXX series pure aluminum or 3XXX series aluminum alloy, and the second solder layer ingot is made of 4XXX series aluminum alloy. The milled first core material layer ingot is rolled, and the milled first solder layer ingot is rolled. The composite aluminum plate is obtained by rolling the stacked first core layer ingot and the first solder layer ingot.

5. The method for manufacturing the composite aluminum tube according to claim 1 or 2, characterized in that, The thickness of the first solder layer is H1, and the thickness of the first core layer is H3, wherein 0.02≤H1 / H3≤0.

11.

6. The method for manufacturing the composite aluminum tube according to claim 1 or 2, characterized in that, The composite aluminum plate also includes a first protective material, which is located between the first core layer and the first solder layer. Both the first protective material and the first core layer are aluminum alloys, and the corrosion potential of the first protective material is lower than that of the first core layer.

7. The method for manufacturing the composite aluminum tube according to claim 3, characterized in that, Before the rolling step of the composite aluminum plate (1), the composite aluminum plate (1) is pressed so that the composite aluminum plate (1) has a first protrusion (11) on at least one side in the thickness direction, and at least part of the first protrusion (11) is inclined relative to the length direction of the composite aluminum plate (1).

8. The method for manufacturing the composite aluminum tube according to claim 7, characterized in that, The composite aluminum plate (1) is pressed within a second preset length, such that a portion of the composite aluminum plate (1) within the second preset length region has the first protrusion (11) on at least one side in the thickness direction of the composite aluminum plate (1). Then, the pressing of the composite aluminum plate (1) is stopped. After the composite aluminum plate (1) moves forward a third preset length in the length direction of the composite aluminum plate (1), the two steps of pressing the composite aluminum plate (1) within the second preset length and stopping the pressing of the composite aluminum plate (1) within the third preset length are repeated.

9. The method for manufacturing the composite aluminum tube according to claim 8, characterized in that, After the embossing roller presses the texture on the composite aluminum plate (1) within the second preset length, the embossing roller is separated from the composite aluminum plate (1), so that the embossing roller and the composite aluminum plate (1) are separated, and the composite aluminum plate (1) moves forward by the third preset length in the length direction of the composite aluminum plate (1).

10. The method for manufacturing the composite aluminum tube according to claim 1 or 2, characterized in that, A first protrusion (11) is pressed onto at least one side of the composite aluminum plate (1) by rolling, wherein the angle between the extension direction of at least a portion of the first protrusion (11) and the width direction of the composite aluminum plate (1) is set to α, wherein 20°≤α≤40°.

11. The method for manufacturing the composite aluminum tube according to claim 1 or 2, characterized in that, The composite aluminum plate (1) is continuously pressed on at least one side in the thickness direction along the width direction of the composite aluminum plate (1).

12. The method for manufacturing the composite aluminum tube according to claim 1 or 2, characterized in that, The composite aluminum plate (1) has a first side (14) and a second side (15) arranged parallel to each other in the thickness direction of the composite aluminum plate (1), wherein the dimension of one of the first side (14) and the second side (15) in the width direction of the composite aluminum plate (1) is smaller than the dimension of the other side in the width direction of the composite aluminum plate (1).

13. The method for manufacturing the composite aluminum tube according to claim 7, characterized in that, The composite aluminum plate (1) has a first side (14) and a second side (15) arranged parallel to each other in the thickness direction of the composite aluminum plate (1). Before pressing the first protrusion (11) of the texture on the composite aluminum plate (1), at least one end of the composite aluminum plate (1) in the width direction is cut to form a cut surface (16). The cut surface (16) is arranged obliquely from one of the first side (14) and the second side (15) toward the other side. The dimension of one of the first side (14) and the second side (15) in the width direction of the composite aluminum plate (1) is smaller than the dimension of the other side in the width direction of the composite aluminum plate (1).

14. The method for manufacturing the composite aluminum tube according to claim 7, characterized in that, The composite aluminum plate (1) has a first side (14) and a second side (15) arranged parallel to each other in the thickness direction of the composite aluminum plate (1). Before pressing the first protrusion (11) of the texture on the composite aluminum plate (1), the composite aluminum plate (1) is placed in a shaping mold. The shaping mold is used to extrude the composite aluminum plate (1) so that the dimension of either the first side (14) or the second side (15) in the width direction of the composite aluminum plate (1) is smaller than the dimension of the other side in the width direction of the composite aluminum plate (1).

15. The method for manufacturing the composite aluminum tube according to claim 7, characterized in that, The inner wall of the first tube (21) has the first protrusion (11), the length of the tube segment with the first protrusion (11) in the first tube (21) is L1, the length of the first tube (21) is L2, L1 < L2, and / or, The inner wall of the second tube (22) has a second protrusion (12), the length of the tube segment with the second protrusion (12) in the second tube (22) is L3, the length of the second tube (22) is L4, and L3 < L4.

16. A composite aluminum tube, characterized in that, The composite aluminum tube includes a tube wall (2), the tube wall (2) includes a body portion (20), the body portion (20) includes a second solder layer (221) and a second core material layer (223) in the thickness direction of the tube wall (2), the second solder layer (221) is located outside the second core material layer (223), the thickness of the second solder layer (221) is h1, and the thickness of the second core material layer (223) is h3, wherein 0.02≤h1 / h3≤0.

11.

17. The composite aluminum tube according to claim 16, characterized in that, The body part (22) further includes a second protective material (222), which is located outside the second core material layer (223) and inside the second solder layer (221). The thickness of the second protective material (222) is h2, wherein 0.012≤h2 / h3≤0.

058.

18. A heat exchanger, characterized in that, The heat exchanger includes a plurality of composite aluminum tubes (105) and fins (10). Each fin (10) includes a through hole (1001) penetrating the fin (10). The plurality of composite aluminum tubes (105) are spaced apart along the length of the fins (10). Each composite aluminum tube (105) penetrates the through hole (1001). Each composite aluminum tube (105) includes a tube wall (1051). The tube wall (1051) includes a second core material layer (223). A portion of the second solder is present between the fins (10) and the composite aluminum tubes (105). And / or, a portion of the second solder is present on the outer side of a portion of the composite aluminum tubes (105) located between two adjacent fins (10).

Images