Heat exchange tube, heat exchanger and air conditioning device

Abstract

The invention provides a heat exchange tube, a heat exchanger and an air conditioning device.The heat exchange tube comprises a capillary heat exchange main tube body and a plurality of capillary heat exchange branch tube bodies, the capillary heat exchange main tube body is connected end to end to form an annular cavity, and one end of the capillary heat exchange main tube body is provided with a heat exchange liquid input tube opening; a heat exchange liquid output pipe opening is formed in the other end of the capillary heat exchange main pipe body, the multiple capillary heat exchange branch pipe bodies are connected in the cavity in an interwoven mode to form a net-shaped structure, multiple first fins are fixed to the pipe wall of the capillary heat exchange main pipe body and the pipe wall of each capillary heat exchange branch pipe body, and gaps are formed between the adjacent first fins. According to the heat exchange tube, the heat exchanger and the air conditioning device, the heat exchange energy efficiency can be improved, and more energy is saved when the heat exchange tube and the heat exchanger are used on the air conditioning device.

Description

Technical Field

[0001] The present invention relates to the technical field of building heating, ventilation and air conditioning, and in particular to a heat exchange tube, a heat exchanger and an air conditioning device. Background Art

[0002] Heat exchanger is a device that transfers part of the heat of hot fluid to cold fluid, also known as heat exchanger. Capillary tube is an ideal high-efficiency heat exchanger, which has been widely used in Europe and the United States for many years. It has also developed rapidly in my country in recent years, especially in the field of HVAC, and has been widely used and highly recognized by people. At present, building energy consumption accounts for more than 30% of the total social energy consumption, and air conditioning energy consumption accounts for 40% to 60% of building energy consumption. How to reduce air conditioning energy consumption is very critical to reducing the total energy consumption of the whole society.

[0003] Capillary heat pump air conditioning system refers to the use of capillaries as front-end collectors for collecting energy or end-end radiators for releasing energy. Capillaries are heat exchange tubes, which have many advantages such as high efficiency and energy saving, small space occupation, no blowing feeling, no noise, stable operation, etc. Although the capillaries in the capillary heat pump air conditioning system are relatively small in size, have good heat exchange performance and high heat flux density, if the heat is dissipated solely by capillaries, the fluid disturbance generated by the convection between the outer surface of the heat exchange tube and the fluid is not obvious, resulting in limited efficiency. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a heat exchange tube, a heat exchanger and an air conditioning device. The heat exchange tube and the heat exchanger can improve the heat exchange efficiency and are more energy-efficient when used in an air conditioning device.

[0005] A first aspect of the present invention provides a heat exchange tube, comprising: a capillary heat exchange main tube body and a plurality of capillary heat exchange branch tube bodies, the capillary heat exchange main tube bodies are connected end to end to form an annular cavity, one end of the capillary heat exchange main tube body has a heat exchange liquid input pipe opening, the other end of the capillary heat exchange main tube body has a heat exchange liquid output pipe opening, the plurality of capillary heat exchange branch tube bodies are interwoven and connected in the cavity to form a mesh structure, and a plurality of first fins are fixed on the tube walls of the capillary heat exchange main tube body and the capillary heat exchange branch tube body, and there are gaps between adjacent first fins.

[0006] Optionally, a second fin is fixed to the same surface of each first fin, the second fin and the first fin extend in the same direction, and there is a gap between the second fin and the adjacent first fin.

[0007] Optionally, the first fin is vertically fixed on the tube wall of the capillary heat exchange main tube body or the capillary heat exchange branch tube body, and the second fin is vertically fixed on the first fin.

[0008] Optionally, the first fin and the second fin are both strip-shaped.

[0009] Optionally, the length, width and height of the second fin are correspondingly smaller than the length, width and height of the first fin.

[0010] Optionally, the first fin extends radially along the capillary heat exchange main tube body or the capillary heat exchange branch tube body.

[0011] Optionally, the second fin is located in the middle of the first fin.

[0012] A second aspect of the present invention provides a heat exchanger, comprising any of the above-mentioned heat exchange tubes, the heat exchanger is a multi-layer cylindrical structure, each layer of the cylindrical structure comprises a plurality of heat exchange tubes, the plurality of heat exchange tubes form a ring structure, and there are gaps between adjacent heat exchange tubes.

[0013] A third aspect of the present invention provides an air conditioning device, comprising any one of the above-mentioned heat exchangers.

[0014] Optionally, a shell is fixed to the outer periphery of the heat exchanger, and a cross-flow fan is arranged on the inner periphery of the heat exchanger.

[0015] The technical solution provided by the embodiment of the present invention has the following advantages compared with the prior art:

[0016] The embodiment of the present invention designs the heat exchange tube as a capillary heat exchange main tube body connected end to end to form an annular cavity, and interweaves and connects multiple capillary heat exchange branch tube bodies in the cavity to form a mesh structure, and fixes the first fin on the surface of the capillary heat exchange main tube body and the capillary heat exchange branch tube body, so that the heat dissipation area is greatly increased compared with the conventional capillary tube, so that the heat exchange area is significantly increased, and the flow path structure of the heat exchange tube is similar to a spider web structure, so that when the fluid passes through the heat exchange tube, it is very easy to become turbulent, form vortices, and destroy the boundary layer of the fluid, thereby enhancing the heat exchange result. In addition, the spider web-like flow path structure also causes the fluid in the heat exchange tube to collide when flowing, causing fluid turbulence. Although it increases some resistance, it enhances the heat exchange effect. The heat exchanger and air conditioning device provided by the embodiment of the present invention connect the heat exchange tubes into several layers of cylindrical structures, occupying a small space and having a large heat exchange area. Heat exchange is performed all around the cross-flow fan, so that the heat exchange effect is better. Heat exchange tubes can have a variety of heat exchange forms and uses. They can be laid on the floor or wall for radiation heat exchange for cooling or heating, or placed in water such as rivers, lakes, etc. for heat conduction and convection heat exchange to collect energy. They can also be placed in various cavities for forced convection heat exchange of air for cooling or heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a heat exchange tube provided in an embodiment of the present invention;

[0018] Figure 2 A schematic diagram of a matching mechanism between a first fin and a second fin provided in an embodiment of the present invention;

[0019] Figure 3 A schematic diagram of the three-dimensional structure of a capillary heat exchange main tube body provided in an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of the three-dimensional structure of a capillary heat exchange branch pipe body provided in an embodiment of the present invention;

[0021] Figure 5 A schematic structural diagram of a cross section of a capillary heat exchange main tube body provided in an embodiment of the present invention;

[0022] Figure 6 A schematic structural diagram of a cross section of a capillary heat exchange branch pipe body provided in an embodiment of the present invention;

[0023] Figure 7 A schematic structural diagram of a cross section of a heat exchanger provided in an embodiment of the present invention;

[0024] Figure 8 A schematic structural diagram of an air conditioning device provided in an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 1. Capillary heat exchange main tube body; 2. Capillary heat exchange branch tube body; 3. Cavity; 4. Heat exchange liquid inlet pipe port; 5. Heat exchange liquid outlet pipe port; 6. First fin; 7. Second fin; 8. Shell; 9. Cross-flow fan; 10. Heat exchange tube; 11. Drain pipe; 12. Refrigerant inlet pipe; 13. Refrigerant outlet pipe. DETAILED DESCRIPTION

[0027] A specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation.

[0028] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the technical solutions of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] Capillary heat pump air conditioning system refers to the use of capillaries as front-end collectors for collecting energy or end-end radiators for releasing energy. It has many advantages such as high efficiency and energy saving, small space occupation, no blowing feeling, no noise, stable operation, etc. Although the capillaries in the capillary heat pump air conditioning system are relatively small in size, have good heat exchange performance and high heat flux density, the efficiency is limited if it relies solely on capillaries for heat dissipation.

[0030] To this end, an embodiment of the present invention provides a heat exchange tube, a heat exchanger and an air conditioning device. The heat exchange tube and the heat exchanger can improve the heat exchange energy efficiency and are more energy-efficient when used in an air conditioning device.

[0031] At least one embodiment of the present invention provides a heat exchange tube, a heat exchanger and an air conditioning device, wherein a heat exchange tube comprises: a capillary heat exchange main tube body and a plurality of capillary heat exchange branch tube bodies, the capillary heat exchange main tube body is connected end to end to form an annular cavity, one end of the capillary heat exchange main tube body has a heat exchange liquid input pipe port, the other end of the capillary heat exchange main tube body has a heat exchange liquid output pipe port, the plurality of capillary heat exchange branch tube bodies are interwoven and connected in the cavity to form a mesh structure, and a plurality of first fins are fixed on the tube walls of the capillary heat exchange main tube body and the capillary heat exchange branch tube body, and there are gaps between adjacent first fins.

[0032] In the heat exchange tube provided by the above-mentioned embodiment of the present invention, the heat exchange tube is designed to be a capillary heat exchange main tube body connected end to end to form an annular cavity, and a plurality of capillary heat exchange branch tube bodies are interwoven and connected in the cavity to form a mesh structure, and a first fin is fixed on the surface of the capillary heat exchange main tube body and the capillary heat exchange branch tube body, so that the heat dissipation area is greatly increased compared with the conventional capillary tube, so that the heat exchange area is significantly increased, and the flow path structure of the heat exchange tube is similar to a spider web structure, so that the fluid is very likely to be turbulent when passing through the heat exchange tube, forming a vortex and destroying the boundary layer of the fluid, thereby enhancing the heat exchange result.

[0033] The present invention is described below by several specific embodiments. In order to keep the following description of the embodiments of the present invention clear and concise, the detailed description of known functions and known components may be omitted. When any component of the embodiments of the present invention appears in more than one accompanying drawings, the component may be represented by the same reference numeral in each of the accompanying drawings.

[0034] refer to Figure 1 , Figure 3 and Figure 4 , Figure 1 A schematic diagram of the structure of a heat exchange tube provided in an embodiment of the present invention is shown in FIG. Figure 1 As shown, Figure 3 A schematic diagram of the three-dimensional structure of a capillary heat exchange main tube body provided in an embodiment of the present invention, Figure 4A schematic diagram of the three-dimensional structure of a capillary heat exchange branch tube body provided in an embodiment of the present invention. A first embodiment of the present invention provides a heat exchange tube, comprising: a capillary heat exchange main tube body 1 and a plurality of capillary heat exchange branch tube bodies 2, the capillary heat exchange main tube body 1 being connected end to end to form an annular cavity 3, one end of the capillary heat exchange main tube body 1 having a heat exchange liquid input pipe port 4, the other end of the capillary heat exchange main tube body 1 having a heat exchange liquid output pipe port 5, a plurality of capillary heat exchange branch tube bodies 2 being interwoven and connected in the cavity 3 to form a mesh structure, a plurality of first fins 6 are fixed on the tube walls of the capillary heat exchange main tube body 1 and the capillary heat exchange branch tube body 2, and there are gaps between adjacent first fins 6. It should be noted that the capillary heat exchange main tube body 1 and the capillary heat exchange branch tube body The branch pipe body 2 has the same size, which can be similar to the size of the PPR capillary network on the market. The pipe diameter is small and dense, so that there can be a larger heat flux density, which is conducive to heat dissipation. The purpose of the invention is to improve and optimize the PPR capillary tube and design a new type of heat exchange tube or capillary tube. The material of the heat exchange tube can be selected from copper, aluminum, PP-R and other materials with good thermal conductivity. Metal materials such as copper and aluminum can be selected, and refrigerant can be used inside for cooling or heating. Copper, aluminum, PP-R and other materials can also be selected, and cold and hot water can be used inside for cooling or heating. The working fluid enters from the heat exchange liquid input pipe port 4 and flows out from the heat exchange liquid output pipe port 5. It can perform heat conduction heat exchange or convection heat exchange with the external fluid, or directly perform radiation heat exchange.

[0035] The embodiment of the present invention designs the heat exchange tube as a capillary heat exchange main tube body connected end to end to form an annular cavity, and interweaves and connects multiple capillary heat exchange branch tube bodies in the cavity to form a mesh structure, and fixes the first fin on the surface of the capillary heat exchange main tube body and the capillary heat exchange branch tube body, so that the heat dissipation area is greatly increased compared with the conventional capillary tube, so that the heat exchange area is significantly increased, and the flow path structure of the heat exchange tube is similar to a spider web structure, so that when the fluid passes through the heat exchange tube, it is very easy to be turbulent, forming vortices, destroying the boundary layer of the fluid, thereby enhancing the heat exchange result. In addition, the spider web-like flow path structure also causes the fluid in the heat exchange tube to collide when flowing, causing fluid turbulence, which increases some resistance but enhances the heat exchange effect. Heat exchange tubes can have a variety of heat exchange forms and uses. They can be laid on the floor or wall for radiation heat exchange for cooling or heating, or placed in water such as rivers, lakes, etc. for heat conduction and convection heat exchange to collect energy. They can also be placed in various cavities for forced convection heat exchange of air for cooling or heating.

[0036] refer to Figure 2 , Figure 2 A schematic diagram of the matching mechanism of the first fin and the second fin provided in an embodiment of the present invention, as shown in FIG. Figure 2As shown, a second fin 7 is fixed on the same surface of each first fin 6, and the second fin 7 extends in the same direction as the first fin 6, and there is a gap between the second fin 7 and the adjacent first fin 6. By arranging the second fin 7 on the side of the first fin 6, the second fin 7 not only increases the heat exchange area of ​​part of the fin, but also forms a gap between the upper and lower adjacent first fins 6, so that the fluid can pass through, increase the disturbance of the fluid, and promote the convective heat transfer effect. When designing the heat exchange tube, it is necessary to ensure that the first fin 6 and / or the second fin 7 are filled between the capillary heat exchange main tube body 1 and the capillary heat exchange branch tube body 2, as well as between the capillary heat exchange branch tube bodies 2, without gaps between the spacings in the middle, and the arrangement is tight to ensure the maximization of the heat exchange area. In addition, between the heat exchange tubes, except for a small gap at the root, there is no gap between the spacings in other positions.

[0037] refer to Figure 5 and Figure 6 , Figure 5 A schematic structural diagram of a cross section of a capillary heat exchange main tube body provided in an embodiment of the present invention, Figure 6 A schematic diagram of the cross section of a capillary heat exchange branch pipe body provided in an embodiment of the present invention is shown in FIG. Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the first fin 6 is vertically fixed on the tube wall of the capillary heat exchange main tube body 1 or the capillary heat exchange branch tube body 2, and the second fin 7 is vertically fixed on the first fin 6. It should be noted that multiple first fins 6 are arranged in multiple circles with equal spacing on the capillary heat exchange main tube body 1 or the capillary heat exchange branch tube body 2, which is more conducive to processing. The first fin 6 is vertically fixed on the tube wall of the capillary heat exchange main tube body 1 or the capillary heat exchange branch tube body 2, and the second fin 7 is vertically fixed on the first fin 6, and there is a small gap between the fins, so that the fluid passing through is easily disturbed, the Reynolds number is increased, and the convective heat exchange effect is promoted.

[0038] The heat exchange tube of the present invention can have a variety of heat exchange forms and uses. It can be laid on the floor or wall for radiation heat exchange for cooling or heating, or placed in water such as rivers and lakes for heat conduction and convection heat exchange to collect energy. It can also be placed in various cavities for forced convection heat exchange of air for cooling or heating, all of which have advantages over ordinary capillaries. The size of the heat exchange tube can also be enlarged, and in addition to being used in the HVAC industry, it can also be used in other fields. In addition, in addition to the refrigerant working fluid in the heat exchange tube, other working fluids such as cold and hot water can also be used for related heat exchange; the heat exchange fluid between the outside and the heat exchange tube, in addition to air, can also be water or even other fluids, all of which can achieve better heat exchange effects.

[0039] Specifically, the first fin 6 and the second fin 7 are both in strip shape, which is characterized by short width and long length, which is beneficial to increase the heat exchange area. Compared with the large sleeve type, the strip has gaps, which is easy to increase the fluid disturbance effect.

[0040] Reference again Figure 3 , the length, width and height of the second fin 7 are all correspondingly smaller than the length, width and height of the first fin 6. Figure 3 The height in the direction shown can be 0.5mm to 3mm. The second fin 7 is smaller than the first fin 6. This arrangement ensures that the spacing between the first fins 6 is small, that is, the first fins 6 are arranged closely up and down with high density, so that the total area of ​​the first fins 6 on the heat exchange tube is large, which is conducive to increasing the heat exchange capacity.

[0041] Specifically, the first fin 6 extends radially along the capillary heat exchange main tube body 1 or the capillary heat exchange branch tube body 2, and the first fin 6 and the second fin 7 extend perpendicularly to the pipeline radial direction, which is conducive to vertically fixing the second fin 7 on the first fin 6 and is more conducive to processing.

[0042] In an embodiment, a heat exchange tube is provided, in which the second fin 7 is located in the middle of the first fin 6, which is beautiful and easy to process.

[0043] The fin structure of the heat exchange tube provided by the present invention does not adopt the conventional large sleeve type fin, because although the large sleeve type fin has a large increased area and forms multiple fin channels, the fluid disturbance generated when the fluid flows through is far less than the fin structure of the heat exchange tube designed by the present invention, which is not conducive to heat exchange. In addition, the area of ​​the large sleeve type fin of the same size is close to the area of ​​the strip fin of the heat exchange tube of the present invention, and there is no area advantage. Due to the unique structural form of the surface of the heat exchange tube, when the fluid passes through, it is very easy to be turbulent on the surface of the heat exchange tube, forming vortices, destroying the boundary layer of the fluid, and enhancing the heat exchange effect; the flow path structure of the heat exchange tube also further increases the area, and its staggered and cross-connected spider web flow path form causes collisions when the fluid flows inside the tube, causing turbulence, and when the fluid outside the tube passes between the capillary heat exchange branch tube bodies, the spider web flow path structure is still easy to cause fluid turbulence, destroying the fluid boundary layer and increasing the heat exchange effect. The above design idea makes the heat transfer capacity of the multi-branch staggered mesh strip fin heat exchange tube much higher than that of ordinary capillary tubes.

[0044] refer to Figure 7 , Figure 7 A schematic diagram of the cross-section of a heat exchanger provided in an embodiment of the present invention is shown in FIG. Figure 7As shown, a second embodiment of the present invention provides a heat exchanger, including any of the above-mentioned heat exchange tubes 10, the heat exchanger is a multi-layer cylindrical structure, each layer of the cylindrical structure includes a plurality of heat exchange tubes 10, the plurality of heat exchange tubes 10 form a ring structure, and there are gaps between adjacent heat exchange tubes 10. The heat exchanger provided in the embodiment of the present invention occupies a small space and has a large heat exchange area by connecting the heat exchange tubes 10 into several layers of cylindrical structures.

[0045] refer to Figure 8 , Figure 8 A schematic diagram of the structure of an air conditioning device provided by an embodiment of the present invention, such as Figure 8 As shown, an air-conditioning device includes any of the above-mentioned heat exchangers. The heat exchange tube 10 of the air-conditioning device can also carry hot and cold water, becoming a mobile air-conditioning form, which belongs to a personalized comfort system to achieve the purpose of local cooling or heating, thereby reducing the temperature difference between indoor and outdoor rooms and thus reducing energy consumption, with obvious energy-saving effects.

[0046] Specifically, a shell 8 is fixed to the outer periphery of the heat exchanger, and a cross-flow fan 9 is arranged on the inner periphery of the heat exchanger. Heat exchange is carried out around the cross-flow fan, so that the heat exchange effect is better. The air-conditioning device selects the cross-flow fan 9, which can greatly reduce the noise in the indoor room.

[0047] During cooling in summer, the refrigerant, which is mainly liquid, enters the liquid distributor from the refrigerant inlet pipe 12, and the refrigerant is divided by the liquid distributor and evenly distributed to the heat exchange tube 10. Driven by the crossflow fan 9, the indoor air enters from the air inlet, and performs forced convection heat exchange with the heat exchange tube 10. After being cooled, it flows out from the air outlet and re-enters the indoor room for cooling. During this process, the refrigerant undergoes a phase change in the heat exchange tube 10, becomes a gaseous refrigerant, absorbs a large amount of heat, thereby cooling the air, and then enters the gas collector, and finally flows out from the refrigerant outlet pipe 13, is compressed at high temperature by the compressor, enters the condenser for heat exchange, and then cools and reduces the pressure through the expansion valve, and re-enters the indoor air conditioning device for heat exchange, and circulates in sequence. During the cooling process, the condensed water produced by the cold air drops into the water tank, and the condensed water can be discharged to the outside through the drain pipe 11. Heating in winter is similar to cooling in summer, and the indoor air conditioning device plays the role of a condenser.

[0048] The air conditioning device provided by the present invention has a cylindrical appearance, with a cylindrical outer shell 8 on the outside, and an upright cross-flow fan 9 in the middle of the outer shell 8 to drive the air flow. The heat exchanger is connected by cylindrical heat exchange tubes 10, and is composed of several layers of cylindrical heat exchange pipe networks from the inside to the outside. The layers are connected in parallel. The heat exchange tubes can be made of copper or aluminum, and the refrigerant flows inside. In addition, the heat exchanger adopts a cylindrical design because when the air passes through, heat is exchanged around the cross-flow fan, which increases the heat exchange area and ensures the heat exchange effect. When cooling in summer, the air flow is cold and condensed water is easily generated. The condensed water drips into the water tank at the lower end with gravity and is discharged outdoors. The heat exchange tubes of the air conditioning device can also flow hot and cold water, becoming a movable air conditioner, which belongs to a personalized comfort system to achieve the purpose of local cooling or heating, thereby reducing the temperature difference between indoor and outdoor rooms and reducing energy consumption, and the energy-saving effect is obvious. The crossflow fan is cylindrical when rotating, and the heat exchanger is cylindrical in structure, which allows it to be close to the crossflow fan with the largest area, so that the crossflow fan is surrounded by heat exchangers, increasing the heat exchange area and being more conducive to heat exchange. In addition, this structure also maximizes the capacity of the heat exchanger in the space between the cylindrical shell and the crossflow fan. The cylindrical shell is also more beautiful, and heat exchange is carried out on all sides of the crossflow fan, maximizing the heat exchange area and ensuring the heat exchange effect.

[0049] The above inventions are only several specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A heat exchange tube, characterized in that: include: A capillary heat exchange main tube body (1) and a plurality of capillary heat exchange branch tube bodies (2), wherein the capillary heat exchange main tube body (1) is connected end to end to form an annular cavity (3), one end of the capillary heat exchange main tube body (1) has a heat exchange liquid input pipe port (4), and the other end of the capillary heat exchange main tube body (1) has a heat exchange liquid output pipe port (5), and a plurality of capillary heat exchange branch tube bodies (2) are interwoven and connected in the cavity (3) to form a mesh structure, and a plurality of first fins (6) are fixed on the tube walls of the capillary heat exchange main tube body (1) and the capillary heat exchange branch tube body (2), and there are gaps between adjacent first fins (6).

2. The heat exchange tube according to claim 1, characterized in that: A second fin (7) is fixed to the same surface of each of the first fins (6); the second fins (7) extend in the same direction as the first fins (6); and there is a gap between the second fins (7) and the adjacent first fins (6).

3. The heat exchange tube according to claim 2, characterized in that: The first fin (6) is vertically fixed on the tube wall of the capillary heat exchange main tube body (1) or the capillary heat exchange branch tube body (2), and the second fin (7) is vertically fixed on the first fin (6).

4. The heat exchange tube according to claim 3, characterized in that: The first fin (6) and the second fin (7) are both in strip shape.

5. The heat exchange tube according to claim 4, characterized in that: The length, width and height of the second fin (7) are correspondingly smaller than the length, width and height of the first fin (6).

6. The heat exchange tube according to claim 2, characterized in that: The first fin (6) extends in the radial direction of the capillary heat exchange main tube body (1) or the capillary heat exchange branch tube body (2).

7. The heat exchange tube according to claim 2, characterized in that: The second fin (7) is located in the middle of the first fin (6).

8. A heat exchanger, characterized in that: The heat exchanger comprises a heat exchange tube as claimed in any one of claims 1 to 7, wherein the heat exchanger is a multi-layer cylindrical structure, each layer of the cylindrical structure comprises a plurality of heat exchange tubes, the plurality of heat exchange tubes form a ring structure, and there are gaps between adjacent heat exchange tubes.

9. An air conditioning device, characterized in that: Comprising the heat exchanger as claimed in claim 8.

10. The air conditioning device according to claim 9, characterized in that: A shell (8) is fixed on the outer periphery of the heat exchanger, and a cross-flow fan (9) is arranged on the inner periphery of the heat exchanger.

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