Small-pipe-diameter composite aluminum pipe

Abstract

The utility model discloses a small-pipe-diameter composite aluminum pipe which comprises a pipe body. The pipe body comprises a base layer pipe body, and an anti-corrosion layer or a welding flux layer is compounded on the inner side wall of the base layer pipe body. An anti-corrosion layer or a welding flux layer is compounded on the outer side wall of the base layer pipe body; the base layer pipe body is an aluminum pipe. The heat exchanger is manufactured through high-frequency welding, the outer diameter of the heat exchanger can reach 2-5 mm, a small-diameter pipe is achieved, meanwhile, the heat exchanger can be manufactured into a small-pipe-diameter heat exchanger, normal air circulation can be guaranteed under the condition that heat exchange is improved, the heat exchanger can be suitable for being used in most environments, the application range is wide, and cost is low. And the convex points, the concave holes, the inner spiral grooves or the inner thread bulges arranged in the heat exchanger can increase the heat exchange area of the refrigerant, so that the heat exchange effect is further improved.

Description

Technical field:

[0001] The utility model relates to the technical field of heat exchanger related equipment, and more specifically to a small-diameter composite aluminum tube. Background technology:

[0002] In the existing refrigeration system, the heat exchanger is an important heat exchange component;

[0003] Existing heat exchangers generally include conventional fin-tube heat exchangers formed by winding fins on heat exchange tubes, and microchannel heat exchangers made of microchannel flat tubes;

[0004] The finned tube heat exchanger has the characteristics that the gap between the tubes is relatively large, which is convenient for the flow of wind and can ensure normal heat exchange. At the same time, it is not easy to block the gap between the tubes, ensuring normal air circulation. However, since the tube is processed by extrusion, the inner diameter of the tube is relatively large, so that the refrigerant flowing inside it only exchanges heat with the part in contact with the inner wall, and the refrigerant in the center of the tube cannot contact the tube wall, so that good heat exchange cannot be achieved, making its heat exchange effect average;

[0005] The microchannel heat exchanger is particularly small in size. Compared with the fin-tube heat exchanger, its volume can be four to five times smaller than that of the fin-tube heat exchanger under the same heat exchange rate, which greatly reduces the space occupied, and the pipes for the flow of refrigerant are very small, so that its contact area is large and the heat exchange efficiency is very high. It is far better than the fin-tube heat exchanger in terms of manufacturing cost and energy saving. However, due to its small size, the gap between the heat exchange fins between its microchannel flat tubes will be very small, and the problem is that this gap is easily blocked by surrounding dust, etc., which affects air circulation. It is not suitable for use in some environments containing a lot of dust or dust, and this microchannel flat tube cannot be made into an S-shaped winding structure like the tube body in the fin-tube heat exchanger. Utility model content:

[0006] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a small-diameter composite aluminum tube, which is made by high-frequency welding so that its outer diameter can reach 2mm to 5mm, realizing a small-diameter tube. At the same time, it can be made into a small-diameter heat exchanger, so that it can ensure normal wind flow while improving heat exchange, so that it can be suitable for use in most environments, with a wide range of applications, and the convex points, concave holes, internal spiral grooves or internal thread protrusions provided inside it can increase the heat exchange area of ​​the refrigerant and further improve the heat exchange effect.

[0007] The solution of the utility model to solve the technical problem is:

[0008] A small-diameter composite aluminum tube comprises a tube body; the tube body comprises a base tube body, and an anti-corrosion layer or a solder layer is compounded on the inner side wall of the base tube body;

[0009] The outer side wall of the base tube body is compounded with an anti-corrosion layer or a solder layer;

[0010] The base tube body is an aluminum tube. The anti-corrosion layer can improve the anti-corrosion effect of the surface of the tube body, and the solder layer can be melted during brazing, so that it can automatically fill in the gaps on the surface of the tube body, thereby improving the sealing effect of the tube body.

[0011] Furthermore, the inner wall of the base tube body is compounded with an anti-corrosion layer, the outer wall of the base tube body is also compounded with an anti-corrosion layer, and the anti-corrosion layer of the outer wall and the anti-corrosion layer of the inner wall are both compounded with a solder layer.

[0012] Furthermore, an anti-corrosion layer is compounded on the inner wall of the base tube body, and a solder layer is compounded on the anti-corrosion layer compounded on the inner wall of the base tube body.

[0013] Furthermore, a solder layer is compounded on the inner side wall of the base tube body, and an anti-corrosion layer is compounded on the solder layer on the inner side wall of the base tube body.

[0014] Furthermore, a solder layer is compounded on the outer wall of the base tube body, and an anti-corrosion layer is compounded on the solder layer on the outer wall of the base tube body.

[0015] Furthermore, an anti-corrosion layer is compounded on the outer wall of the base tube body, and a solder layer is compounded on the anti-corrosion layer on the outer wall of the base tube body.

[0016] Furthermore, the pipe body has an outer diameter of 2 mm to 5 mm; the anti-corrosion layer is an aluminum alloy layer. The pipe body is a high-frequency welded pipe made by high-frequency welding. Due to the high-frequency welding, its outer diameter can reach 2 mm to 5 mm, realizing the manufacture of small-diameter pipes.

[0017] The outstanding effects of the utility model are:

[0018] Compared with the prior art, it is made of high-frequency welding, so that its outer diameter can reach 2mm to 4mm, realizing a small diameter tube. At the same time, it can be made into a small-diameter heat exchanger, so that it can ensure normal wind flow while improving heat exchange, making it suitable for use in most environments and having a wide range of applications. The convex points, concave holes, inner spiral grooves or inner spiral protrusions inside it can increase the heat exchange area of ​​the refrigerant and further improve the heat exchange effect.

[0019] Moreover, the convex points, concave holes, inner spiral grooves or inner spiral protrusions arranged inside the refrigerant can increase the heat exchange area of ​​the refrigerant and further improve the heat exchange effect. Description of the drawings:

[0020] Figure 1 It is a structural schematic diagram of the utility model;

[0021] Figure 2 It is a second partial structural schematic diagram of the utility model;

[0022] Figure 3 This is a third partial structural schematic diagram of the utility model;

[0023] Figure 4 This is a fourth partial structural schematic diagram of the utility model;

[0024] Figure 5 This is a fifth partial structural schematic diagram of the utility model;

[0025] Figure 6 This is a sixth partial structural schematic diagram of the utility model;

[0026] Figure 7 This is a seventh partial structural schematic diagram of the utility model;

[0027] Figure 8 This is the eighth partial structural schematic diagram of the utility model;

[0028] Fig. 9 This is a ninth partial structural schematic diagram of the utility model;

[0029] Fig.10 This is the tenth partial structural schematic diagram of the utility model;

[0030] Fig.11 This is the eleventh partial structural schematic diagram of the utility model;

[0031] Fig.12 This is the twelfth partial structural schematic diagram of the utility model;

[0032] Fig.13 It is the thirteenth partial structural schematic diagram of the utility model;

[0033] Fig.14 This is the fourteenth partial structural schematic diagram of the utility model;

[0034] Fig.15 This is the fifteenth partial structural schematic diagram of the utility model;

[0035] Fig.16 This is the sixteenth partial structural schematic diagram of the utility model;

[0036] Fig.17 It is a partial cross-sectional view of the tube body;

[0037] Fig.18It is a partial cross-sectional view of another structure of the tube body;

[0038] Fig.19 It is a partial cross-sectional view of the third structure of the tube body;

[0039] Fig. 20 It is a partial cross-sectional view of the fourth structure of the tube body. Specific implementation method:

[0040] For example, see Figures 1 to 20 As shown, a small-diameter composite aluminum tube includes a tube body 10; the tube body 10 includes a base tube body 1, and an anti-corrosion layer 2 or a solder layer 3 is compounded on the inner wall of the base tube body 1; an anti-corrosion layer 2 or a solder layer 3 is compounded on the outer wall of the base tube body 1; the base tube body 1 is an aluminum tube.

[0041] The composite method in this embodiment adopts a rolling process. The raw material plate of the base tube body 1, the anti-corrosion layer 2 and the solder layer 3 are all metal sheets. According to the different needs of the manufactured pipes, the anti-corrosion layer 2 and the solder layer 3 are compounded with one wall of the raw material plate of the base tube body 1 by roller extrusion rolling, or one of the anti-corrosion layer 2 and the solder layer 3 is compounded with one wall of the raw material plate of the base tube body 1 by roller extrusion rolling. Generally, both sides of the raw material plate of the base tube body 1 need to be rolled and compounded with the corresponding anti-corrosion layer 2 and solder layer 3 or one of the anti-corrosion layer 2 and solder layer 3 to form a composite plate.

[0042] Then, the composite plate is cut and bent and rolled into a tube shape, and the joints of the tube are welded by high-frequency welding. This high-frequency welding is a commonly used processing method and will not be described in detail here. This method can be used to produce a tube body 10 with an outer diameter of 2mm to 5mm.

[0043] The base tube body 1 in this embodiment adopts 3003 series aluminum plate, which is a common product of aluminum-manganese alloy series. Due to the manganese alloy element, this product has excellent anti-rust properties and is also called anti-rust aluminum plate.

[0044] The anti-corrosion layer 2 uses 7072 aluminum alloy, which is a cold-treated forged alloy with high strength, far superior to mild steel. It has ordinary corrosion resistance, good mechanical properties and anodic reaction. The fine grains make deep drilling performance better, tool wear resistance enhanced, and thread rolling more unique. The chemical composition of 7072 aluminum alloy: silicon Si: 0.40; iron Fe: 0.50; copper Cu: 1.2-2.0; manganese Mn: 0.30; magnesium Mg: 2.1-2.9; chromium Cr: 0.18-0.28; zinc Zn: 5.1-6.1; titanium Ti: 0.20; aluminum Al: balance. Its anti-corrosion effect is higher than that of the base pipe body 1.

[0045] The solder layer 3 uses 4343 aluminum-based solder, 4045 aluminum-based solder, and 4047 aluminum-based solder.

[0046] Attached Figures 1 to 16 Sixteen kinds of composite pipe bodies 10 of this embodiment are as follows:

[0047] like Figure 1 As shown, the outer wall surface of the base tube body 1 is compounded with an anti-corrosion layer 2, and the inner wall surface is compounded with a solder layer 3; when the heat exchanger processed with this tube body 10 is heated and welded in a brazing furnace, the internal solder layer 3 will melt, and it will fill some gaps on the inner wall of the base tube body 1, thereby improving the sealing connection effect. Moreover, when an external connector (such as a connecting pipe) is inserted into the interior, when the internal solder layer 3 melts, the outer wall contact part of the inserted connector can be welded and fixed to the inner wall of the tube body 10 through the solder layer 3, and the anti-corrosion layer 2 further improves the anti-corrosion effect of the outer side of the tube body 10.

[0048] like Figure 2 As shown, the outer wall surface and the inner wall surface of the base tube body 1 are both compounded with a solder layer 3. When the heat exchanger processed by this tube body 10 is heated and welded in a brazing furnace, the internal and external solder layers 3 will melt, and some gaps on the inner wall and the outer wall of the base tube body 1 will be filled to improve the sealing connection effect. Similarly, when an external connector (such as a connecting pipe) is inserted into the interior or the outer wall of the tube body 10 is connected to other connectors, the inner solder layer 3 and the outer solder layer 3 are melted, and the contact part of the outer wall of the inserted connector can be welded and fixed to the inner wall of the tube body 10 through the solder layer 3, or the contact part of the outer wall of the tube body 10 and the connector can be welded and fixed.

[0049] like Figure 3 As shown, the outer wall and inner wall of the base tube body 1 are both compounded with an anti-corrosion layer 2. This structure achieves a protective effect through the inner and outer anti-corrosion layers 2, and there is no solder layer. During brazing, solder needs to be added. The anti-corrosion layer 2 further improves the anti-corrosion effect of the outer and inner sides of the tube body 10.

[0050] like Figure 4 As shown, the outer wall surface of the base tube body 1 is compounded with a solder layer 3, and the inner wall surface is compounded with an anti-corrosion layer 2. When the heat exchanger processed with this tube body 10 is heated and welded in a brazing furnace, the external solder layer 3 will melt, and it will fill some gaps on the outer wall of the base tube body 1 to improve the sealing connection effect. Moreover, when the part in contact with the external connecting piece is melted by the external solder layer 3, the outer wall surface of the tube body 10 and the contact part of the external connecting piece can be welded and fixed, and the anti-corrosion layer 2 further improves the internal anti-corrosion effect.

[0051] like Figure 5 As shown, the inner wall of the base tube body 1 is compounded with an anti-corrosion layer 2, the outer wall of the base tube body 1 is also compounded with an anti-corrosion layer 2, and the anti-corrosion layer 2 of the inner wall is compounded with a solder layer 3. When the heat exchanger processed by this tube body 10 is heated and welded in a brazing furnace, the solder layer 3 inside it will melt, and it will fill some gaps on the inner anti-corrosion layer 2 to improve the sealing connection effect, and when an external connector (such as a connecting pipe) is inserted into the interior, when the internal solder layer 3 melts, the contact part of the outer wall of the inserted connector can be fixed to the inner wall of the tube body 10 through the solder layer 3, and the anti-corrosion layer 2 further improves the anti-corrosion effect of the outer and inner sides of the tube body 10.

[0052] like Figure 6 As shown, the inner wall of the base tube body 1 is compounded with an anti-corrosion layer 2, the outer wall of the base tube body 1 is compounded with a solder layer 3, and the anti-corrosion layer 2 of the inner wall is compounded with a solder layer 3. When the heat exchanger processed by this tube body 10 is heated and welded in a brazing furnace, the internal and external solder layers 3 will melt, which will fill some gaps on the outer wall of the base tube body 1 and the gaps on the internal anti-corrosion layer 2 to improve the sealing connection effect. Similarly, when an external connector (such as a connecting pipe) is inserted into the interior or the outer wall of the tube body 10 is connected to other connectors, the contact part of the outer wall of the inserted connector can be welded and fixed to the inner wall of the tube body 10 through the solder layer 3 or the contact part of the outer wall of the tube body 10 and the connector can be welded and fixed. The anti-corrosion layer 2 further improves the anti-corrosion effect of the inner side of the tube body 10.

[0053] like Figure 7 As shown, the inner wall of the base tube body 1 is compounded with a solder layer 3, the outer wall of the base tube body 1 is compounded with an anti-corrosion layer 2, and the solder layer 3 of the inner wall is compounded with the anti-corrosion layer 2. When the heat exchanger processed by the tube body 10 is heated and welded in a brazing furnace, the solder layer 3 will melt, and it will fill some gaps on the inner wall of the base tube body 1 and the gaps of the inner anti-corrosion layer 2 to improve the sealing connection effect. The anti-corrosion layer 2 further improves the anti-corrosion effect on the inner and outer sides of the tube body 10.

[0054] like Figure 8As shown, the inner wall and the outer wall of the base tube body 1 are both compounded with a solder layer 3, and the solder layer 3 of the inner wall of the base tube body 1 is compounded with an anti-corrosion layer 2. When the heat exchanger processed by this tube body 10 is heated and welded in a brazing furnace, the solder layer 3 will melt, and it will fill some gaps on the inner wall of the base tube body 1 and the gaps of the inner anti-corrosion layer 2 to improve the sealing connection effect. At the same time, when the outer wall of the tube body 10 is connected to other connectors, the outer wall of the tube body 10 can be welded and fixed to the contact part of the connector by melting the external solder layer 3. The anti-corrosion layer 2 further improves the anti-corrosion effect inside the tube body 10.

[0055] like Fig. 9 As shown, the inner and outer walls of the base tube body 1 are both compounded with an anti-corrosion layer 2, and the anti-corrosion layer 2 of the outer wall of the base tube body 1 is compounded with a solder layer 3. When the heat exchanger processed by this tube body 10 is heated and welded in a brazing furnace, the solder layer 3 will melt, and it will fill some gaps on the outer wall of the base tube body 1 to improve the sealing connection effect. The anti-corrosion layer 2 further improves the anti-corrosion effect inside and outside the tube body 10. At the same time, when the outer wall of the tube body 10 is connected to other connectors, the outer wall of the tube body 10 can be welded and fixed to the contact part with the connector by melting the external solder layer 3.

[0056] like Fig.10 As shown, the inner wall of the base tube body 1 is compounded with an anti-corrosion layer 2, the outer wall of the base tube body 1 is compounded with a solder layer 3, and the solder layer 3 of the outer wall of the base tube body 1 is compounded with the anti-corrosion layer 2. When the heat exchanger processed by the tube body 10 is heated and welded in a brazing furnace, the solder layer 3 will melt, and it will fill some gaps on the outer wall of the base tube body 1 and the gaps on the external anti-corrosion layer 2 to improve the sealing connection effect. The anti-corrosion layer 2 further improves the anti-corrosion effect inside and outside the tube body 10.

[0057] like Fig.11As shown, the inner wall of the base tube body 1 is compounded with a solder layer 3, the outer wall of the base tube body 1 is compounded with an anti-corrosion layer 2, and the anti-corrosion layer 2 of the outer wall of the base tube body 1 is compounded with a solder layer 3. When the heat exchanger processed by the tube body 10 is heated and welded in a brazing furnace, the internal and external solder layers 3 will melt, which will fill some gaps on the inner wall of the base tube body 1 and fill the gaps on the external anti-corrosion layer 2 to improve the sealing connection effect. Similarly, when an external connector (such as a connecting pipe) is inserted into the interior or the outer wall of the tube body 10 is connected to other connectors, the contact part of the outer wall of the inserted connector can be welded and fixed to the inner wall of the tube body 10 through the solder layer 3 or the contact part of the outer wall of the tube body 10 and the connector can be welded and fixed. The anti-corrosion layer 2 further improves the anti-corrosion effect of the outside of the tube body 10.

[0058] like Fig.12 As shown, the inner and outer walls of the base tube body 1 are both compounded with a solder layer 3, and the solder layer 3 on the outer wall of the base tube body 1 is compounded with an anti-corrosion layer 2. When the heat exchanger processed by this tube body 10 is heated and welded in a brazing furnace, the inner and outer solder layers 3 will melt, which will fill some gaps on the inner wall of the base tube body 1, and fill the gaps on the outer anti-corrosion layer 2 and the outer wall of the base tube body 1, thereby improving the sealing connection effect. Similarly, when an external connector (such as a connecting pipe) is inserted into the interior, the contact part of the outer wall of the inserted connector can be fixed to the inner wall of the tube body 10 by welding through the solder layer 3 through the melting of the internal solder layer 3. The anti-corrosion layer 2 further improves the anti-corrosion effect of the outer part of the tube body 10.

[0059] like Fig.13 As shown, the inner and outer walls of the base tube body 1 are both compounded with an anticorrosion layer 2, the anticorrosion layer 2 on the outer wall of the base tube body 1 is compounded with a solder layer 3, and the anticorrosion layer 2 on the inner wall of the base tube body 1 is compounded with a solder layer 3. When the heat exchanger processed by this tube body 10 is heated and welded in a brazing furnace, the internal and external solder layers 3 will melt, and some gaps of the anticorrosion layer 2 on the inner and outer walls of the base tube body 1 will be filled to improve the sealing connection effect. Similarly, when an external connector (such as a connecting pipe) is inserted into the interior or the outer wall of the tube body 10 is connected to other connectors, the contact part of the outer wall of the inserted connector can be welded and fixed to the inner wall of the tube body 10 through the solder layer 3 or the contact part of the outer wall of the tube body 10 and the connector can be welded and fixed. The anticorrosion layer 2 further improves the anticorrosion effect of the outside and inside of the tube body 10. This structure is the best model in production, with the best welding and anti-corrosion effects.

[0060] like Fig.14 As shown, the inner wall of the base tube body 1 is compounded with an anti-corrosion layer 2, the outer wall of the base tube body 1 is compounded with a solder layer 3, the anti-corrosion layer 2 on the inner wall of the base tube body 1 is compounded with a solder layer 3, and the solder layer 3 on the outer wall of the base tube body 1 is compounded with an anti-corrosion layer 2. When the heat exchanger processed by this tube body 10 is heated and welded in a brazing furnace, the internal and external solder layers 3 will melt, which will fill some gaps in the anti-corrosion layer 2 on the inner wall of the base tube body 1, and fill some gaps in the outer wall of the base tube body 1 and the outer anti-corrosion layer 2, thereby improving the sealing connection effect. Similarly, when an external connector (such as a connecting pipe) is inserted into the interior, the contact part of the outer wall of the inserted connector can be fixed to the inner wall of the tube body 10 by welding through the solder layer 3 through the melting of the internal solder layer 3. The anti-corrosion layer 2 further improves the external and internal anti-corrosion effect of the tube body 10.

[0061] like Fig.15 As shown, the inner wall of the base tube body 1 is compounded with a solder layer 3, the outer wall of the base tube body 1 is compounded with an anti-corrosion layer 2, the solder layer 3 on the inner wall of the base tube body 1 is compounded with an anti-corrosion layer 2, and the anti-corrosion layer 2 on the outer wall of the base tube body 1 is compounded with a solder layer 3. When the heat exchanger processed by this tube body 10 is heated and welded in a brazing furnace, the solder layer 3 inside and outside will melt, and it will fill some gaps between the inner wall of the base tube body 1 and the anti-corrosion layer 2 inside, and fill some gaps of the anti-corrosion layer 2 outside the base tube body 1, so as to improve the sealing connection effect. Similarly, when the outer wall of the tube body 10 is connected to other connectors, the outer wall of the tube body 10 can be welded and fixed to the contact part with the connector by melting the external solder layer 3. The anti-corrosion layer 2 further improves the anti-corrosion effect of the outside and inside of the tube body 10.

[0062] like Fig.16 As shown, the inner and outer walls of the base tube body 1 are both compounded with a solder layer 3, the solder layer 3 on the inner wall of the base tube body 1 is compounded with an anti-corrosion layer 2, and the solder layer 3 on the outer wall of the base tube body 1 is also compounded with an anti-corrosion layer 2. When the heat exchanger processed by this tube body 10 is heated and welded in a brazing furnace, the solder layer 3 inside and outside will melt, and it will fill some gaps between the inner wall of the base tube body 1 and the anti-corrosion layer 2 inside, and fill some gaps between the outer wall of the base tube body 1 and the anti-corrosion layer 2 outside, thereby improving the sealing connection effect. The anti-corrosion layer 2 further improves the anti-corrosion effect of the outside and inside of the tube body 10.

[0063] At the same time, in order to further improve the heat exchange effect, a plurality of convex points or concave holes are formed on the inner side wall of the tube body 10. Fig.17 and Fig.19shown.

[0064] Alternatively, an inner spiral groove 4 or an inner spiral protrusion is formed on the inner side wall of the tube body 10, such as Fig.18 and Fig. 20 shown.

[0065] Both of the above methods can increase the contact area between the refrigerant and the inner wall of the tube body 10, thereby improving the heat exchange effect.

[0066] And as Fig.17 and Fig.18 As shown, the processing method is to form a plurality of concave holes (all concave holes are arranged alternately) or a plurality of mutually parallel oblique strip grooves (in each of two adjacent oblique strip grooves, the bottom end of the front oblique strip groove and the top end of the rear oblique strip groove are on the same straight line) directly on one of the walls of the composite plate by stamping on each wall surface (two walls) of the raw material plate of the base tube body 1. Of course, other manufacturing methods can also be used, which will not be introduced here one by one. Then, the composite plate is cut and bent and wound into a tube shape, and the joints of the tube body are welded by high-frequency welding. At this time, a plurality of recessed holes are formed on the inner wall of the tube body 10, and after the composite plate formed with the oblique strip grooves is wound, the oblique strip grooves will be wound and bent. At this time, in two adjacent oblique strip grooves, the bottom end of the front oblique strip groove and the top end of the rear oblique strip groove will be connected, and all the oblique strip grooves will form an inner spiral groove 4. However, since the joints of the tube body will be welded, the welding joints will cause obstructions at the connection points of the adjacent oblique strip grooves, which will affect the connection between the two adjacent oblique strip grooves, but it does not affect the need to increase the heat exchange area. It can still increase the contact area between the refrigerant and the inner wall of the tube body 10, thereby improving its heat exchange effect.

[0067] like Fig.19 and Fig. 20 , and Fig.17 and 18 The difference is that multiple convex points (all convex points are arranged in a staggered manner) or multiple mutually parallel oblique strip protrusions are formed on the composite board by rolling (in each of the two adjacent oblique strip protrusions, the bottom end of the front oblique strip protrusion and the top end of the rear oblique strip protrusion are on the same straight line), and the rest are the same Fig.17 and 18 The processing method is the same as that of the pipe body 10, so that a plurality of convex points or internal thread protrusions are formed on the inner wall of the pipe body 10 (of course, other manufacturing methods can also be used for forming, which will not be introduced here one by one), and the effect is also to increase the contact area between the refrigerant and the inner wall of the pipe body 10, thereby improving its heat exchange effect.

[0068] The small-diameter heat exchanger made by this embodiment, such as a fin-type small-diameter heat exchanger, can ensure normal air flow while improving heat exchange, so that it can be used in most environments and has a wide range of applications. The convex points, concave holes, internal spiral grooves or internal spiral protrusions provided inside it can increase the heat exchange area of ​​the refrigerant and further improve the heat exchange effect.

[0069] The above implementation modes are only used to illustrate the present invention, but not to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The scope of patent protection of the present invention should be limited by the claims.

Claims

1. A small-diameter composite aluminum tube, comprising a tube body (10); characterized in that: The tube body (10) comprises a base tube body (1), and an anti-corrosion layer (2) and a solder layer (3) or one of the anti-corrosion layer (2) and the solder layer (3) are composited on the inner side wall of the base tube body (1); The outer side wall of the base tube body (1) is composited with an anti-corrosion layer (2) and a solder layer (3) or one of the anti-corrosion layer (2) and the solder layer (3); The base tube body (1) is an aluminum tube.

2. The small-diameter composite aluminum tube according to claim 1, characterized in that: The inner wall of the base tube body (1) is compounded with an anti-corrosion layer (2), the outer wall of the base tube body (1) is also compounded with an anti-corrosion layer (2), and the anti-corrosion layer (2) of the outer wall and the anti-corrosion layer (2) of the inner wall are both compounded with a solder layer (3).

3. The small-diameter composite aluminum tube according to claim 1, characterized in that: The inner wall of the base tube body (1) is compounded with an anti-corrosion layer (2), and the anti-corrosion layer (2) compounded on the inner wall of the base tube body (1) is compounded with a solder layer (3).

4. The small-diameter composite aluminum tube according to claim 1, characterized in that: The inner side wall of the base tube body (1) is compounded with a solder layer (3), and the solder layer (3) on the inner side wall of the base tube body (1) is compounded with an anti-corrosion layer (2).

5. The small-diameter composite aluminum tube according to claim 1, characterized in that: The outer wall of the base tube body (1) is compounded with a solder layer (3), and the solder layer (3) on the outer wall of the base tube body (1) is compounded with an anti-corrosion layer (2).

6. The small-diameter composite aluminum tube according to claim 1, characterized in that: The outer wall of the base tube body (1) is compounded with an anti-corrosion layer (2), and the anti-corrosion layer (2) on the outer wall of the base tube body (1) is compounded with a solder layer (3).

7. The small-diameter composite aluminum tube according to claim 1, characterized in that: The pipe body (10) is a pipe body with an outer diameter of 2 mm to 5 mm; the anti-corrosion layer (2) is an aluminum alloy layer.

8. The small-diameter composite aluminum tube according to claim 1, characterized in that: A plurality of concave holes or convex points are formed on the inner side wall of the tube body (10).

9. The small-diameter composite aluminum tube according to claim 1, characterized in that: An inner spiral groove (4) or an inner thread protrusion is formed on the inner side wall of the tube body (10).

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