Heat exchange tube, heat exchanger and air conditioning equipment

Abstract

The present invention provides a heat exchange tube, a heat exchanger and an air conditioning device, relating to the technical field of heat exchangers, and solving the technical problems in the prior art that the flow disturbance effect inside the heat exchange tube is limited and the pressure drop is relatively high. The inside of the heat exchange tube includes a continuous tooth distribution area and also a dot tooth distribution area. Preferably, a dot tooth distribution area is arranged between two continuous tooth distribution areas. By adopting the structure with different tooth types and different distribution modes in the present invention, it is beneficial to reduce the pressure drop inside the heat exchange tube, increase the flow disturbance effect and improve the heat exchange efficiency.

Description

Technical Field

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

[0002] For the entire water-cooled air conditioning system, the refrigerant mainly undergoes a phase change in the shell-and-tube heat exchanger, continuously absorbing and releasing energy, thereby performing heat exchange with water. Therefore, the performance of the heat exchanger largely determines the quality of the unit.

[0003] Currently, the performance is mainly improved by optimizing the internal structure of the shell-and-tube heat exchanger and selecting various high-efficiency heat exchange tubes. For high-efficiency heat exchange tubes, various fins, racks, and grooves are mainly processed on the inner and outer surfaces to improve the heat exchange efficiency. The design and development of existing high-efficiency tubes mainly focus on the design of the external fins of the tube, while less consideration is given to the internal tooth structure of the tube. The internal strengthening technology mainly uses several inherent (trapezoidal, triangular, etc.) continuous spiral teeth, which have limited turbulence effects and high pressure drops. Summary of the Invention

[0004] The purpose of the present invention is to provide a heat exchange tube, a heat exchanger and an air conditioning device, which solve the technical problems of limited turbulence effect inside the heat exchange tube and relatively high pressure drop existing in the prior art. The many technical effects that can be produced by the preferred technical solutions provided by the present invention are described in detail below.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A heat exchange tube provided by the present invention includes a heat exchange tube body, an internal tooth is provided on the inner side of the heat exchange tube body, a part or all of the inner side surface of the heat exchange tube body is a dot-shaped tooth distribution area, and several internal teeth on the dot-shaped tooth distribution area are in a dot-shaped convex structure and are spaced apart on the dot-shaped tooth distribution area.

[0007] Further, a part of the inner side surface of the heat exchange tube body is a continuous tooth distribution area, and the internal teeth on the continuous tooth distribution area are spiral teeth or annular teeth.

[0008] Further, the dot-shaped tooth distribution area is provided between two continuous tooth distribution areas.

[0009] Further, the spiral teeth of the two continuous tooth distribution areas adjacent to the dot-shaped tooth distribution area have opposite helix directions.

[0010] Further, the heights of the spiral teeth on the continuous tooth distribution area are the same; or, the heights of the spiral teeth on the continuous tooth distribution area are not completely the same.

[0011] Further, among the internal teeth in the continuous tooth distribution area, two or more adjacent spiral teeth form a spiral tooth group. The internal teeth in the continuous tooth distribution area are composed of multiple spiral tooth groups. Among the spiral teeth in a spiral tooth group, the height of one spiral tooth is greater than the heights of the other spiral teeth in this spiral tooth group.

[0012] Further, the spiral tooth group includes an intermediate spiral tooth and side spiral teeth. The two side spiral teeth are symmetrically distributed on both sides of the intermediate spiral tooth, and the height of the intermediate spiral tooth is greater than the heights of the side spiral teeth.

[0013] Further, the root width L1 of the intermediate spiral tooth ranges from 0.2 mm to 1 mm; the tooth height h1 of the intermediate spiral tooth ranges from 0.4 mm to 1 mm.

[0014] Further, the root width L2 of the side spiral tooth is from 0.2 mm to 1 mm; the tooth height h2 of the side spiral tooth is from 0.2 mm to 0.8 mm.

[0015] Further, the cross-section of the intermediate spiral tooth perpendicular to the heat exchange tube is an isosceles triangle; the cross-section of the side spiral tooth perpendicular to the heat exchange tube is an obtuse triangle and the tooth tip of the side spiral tooth approaches the intermediate spiral tooth.

[0016] Further, the internal teeth in the dot tooth distribution area include large dot teeth and small dot teeth, and the volume of the large dot teeth is greater than the volume of the small dot teeth.

[0017] Further, the internal teeth in the dot tooth distribution area are pyramid structures with a polygonal bottom surface.

[0018] Further, the large dot teeth and the small dot teeth located on the same spiral line are distributed at intervals to form a row of spiral dot teeth, and multiple rows of spiral dot teeth are distributed in the circumferential direction of the dot tooth distribution area.

[0019] Further, the dot tooth distribution area includes a first dot distribution area and a second dot distribution area located on one side of the first dot distribution area. The spiral dot teeth in the first dot distribution area and the spiral dot teeth in the second dot distribution area have different helix directions.

[0020] Further, the helix directions of the spiral dot teeth in the first dot distribution area and the spiral teeth in the adjacent continuous tooth distribution area are different, and the helix directions of the spiral dot teeth in the second dot distribution area and the spiral teeth in the adjacent continuous tooth distribution area are different.

[0021] Furthermore, the internal teeth in the dot-shaped tooth distribution area are of a quadrangular pyramid structure, and the major axis of the bottom surface of the large dot-shaped teeth is along the corresponding spiral direction; the major axis of the bottom surface of the small dot-shaped teeth is along the corresponding spiral direction or there is an included angle between the major axis direction of the bottom surface of the small dot-shaped teeth and the corresponding spiral direction.

[0022] Furthermore, the large dot-shaped teeth are of a quadrangular pyramid structure, the range of the length L3 in the major axis direction of the bottom surface of the large dot-shaped teeth is 0.6 mm to 2 mm, and the range of the tooth height h3 of the large dot-shaped teeth is 0.4 mm to 1 mm.

[0023] Furthermore, the small dot-shaped teeth are of a quadrangular pyramid structure, the range of the length L4 in the major axis direction of the bottom surface of the small dot-shaped teeth is 0.4 mm to 1.6 mm, and the range of the tooth height h4 of the small dot-shaped teeth is 0.2 mm to 0.8 mm.

[0024] The present invention provides a heat exchanger, including the heat exchange tube described above.

[0025] The present invention provides an air conditioning device, including the heat exchange tube described above.

[0026] The present invention provides a heat exchange tube, including a heat exchange tube body. Some or all of the inner side surfaces of the heat exchange tube body are dot-shaped tooth distribution areas. A plurality of internal teeth on the dot-shaped tooth distribution areas are in a dot-shaped convex structure and are spaced apart on the dot-shaped tooth distribution areas. For the heat exchange tube provided by the present invention, since the internal teeth in the dot-shaped tooth distribution area are not continuous teeth, compared with the existing continuous spiral teeth at present, it is beneficial to reduce the space occupied by the internal teeth in the heat exchange tube, and thus has the effect of reducing the pressure drop.

[0027] The preferred technical solution of the present invention can at least further produce the following technical effects:

[0028] The inner side of the heat exchange tube body includes both a continuous tooth distribution area and a dot-shaped tooth distribution area. Preferably, a dot-shaped tooth distribution area is arranged between two continuous tooth distribution areas. When the liquid refrigerant (or water) passes through this heat exchange tube, due to the change of its internal teeth, its flow state also changes violently, so as to ensure the heat exchange effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a schematic structural diagram of a partial area of the heat exchange tube provided by the embodiment of the present invention;

[0031] Figure 2 It is a top view schematic diagram of a partial area of the heat exchange tube provided by an embodiment of the present invention;

[0032] Figure 3 It is a cross-sectional view schematic diagram of the middle spiral teeth and the side spiral teeth provided by an embodiment of the present invention;

[0033] Figure 4 It is a top view schematic diagram of the large dot-shaped teeth provided by an embodiment of the present invention;

[0034] Figure 5 It is a top view schematic diagram of the small dot-shaped teeth provided by an embodiment of the present invention;

[0035] Figure 6 It is a cross-sectional view schematic diagram of the large dot-shaped teeth provided by an embodiment of the present invention;

[0036] Figure 7 It is a cross-sectional view schematic diagram of the small dot-shaped teeth provided by an embodiment of the present invention;

[0037] In the figure, 1 is the dot-shaped tooth distribution area; 11 is the first dot-shaped distribution area; 12 is the second dot-shaped distribution area; 2 is the continuous tooth distribution area; 3 is the middle spiral tooth; 4 is the side spiral tooth; 5 is the large dot-shaped tooth; 6 is the small dot-shaped tooth. Detailed implementation manners

[0038] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other implementation manners obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope protected by the present invention.

[0039] Currently, the design of the internal teeth of high-efficiency heat exchange tubes mainly uses several inherent continuous spiral teeth, which have the disadvantage of relatively high pressure drop. The present invention provides a heat exchange tube, including a heat exchange tube body, with internal teeth provided on the inner side of the heat exchange tube body. Part or all of the inner side surfaces of the heat exchange tube body are dot-shaped tooth distribution areas 1, and several internal teeth on the dot-shaped tooth distribution areas 1 are in a dot-shaped convex structure and are spaced apart on the dot-shaped tooth distribution areas 1. For the heat exchange tube provided by the present invention, since the internal teeth of the dot-shaped tooth distribution area 1 are not continuous teeth, compared with the existing continuous spiral teeth, it is beneficial to reduce the space occupied by the internal teeth in the heat exchange tube, and thus has the effect of reducing the pressure drop. In addition, the internal teeth on the dot-shaped tooth distribution areas also have the effect of disturbing the flow of the liquid in the tube and increasing the heat exchange area to ensure the heat exchange efficiency.

[0040] As an alternative implementation, a part of the inner side surface of the heat exchange tube body is a continuous tooth distribution area 2, and the inner teeth on the continuous tooth distribution area 2 are spiral teeth or annular teeth. That is, the inner side of the heat exchange tube body includes both the continuous tooth distribution area 2 and the dot tooth distribution area 1. Preferably, the dot tooth distribution area 1 is arranged between two continuous tooth distribution areas 2. The specific description is as follows: When the liquid refrigerant (or water) flows through the continuous tooth distribution area 2, since the (continuous) spiral teeth are spirally distributed and flow channels are formed between the spiral teeth, the fluid flows in a spiral shape. When the liquid refrigerant (or water) flows through the dot tooth distribution area 1, since the inner teeth on the dot tooth distribution area 1 are not continuous spiral teeth, the motion state of the fluid flowing in a spiral shape at this time changes, thereby further increasing the turbulence intensity inside the tube. When the liquid refrigerant (or water) flows to the next continuous tooth distribution area 2, the flow state at this time is similar to that of the previous continuous tooth distribution area 2. Preferably, the spiral directions of the spiral teeth in two adjacent continuous tooth distribution areas 2 of the dot tooth distribution area 1 are opposite. Refer to Figure 1 , which shows two continuous tooth distribution areas 2 with opposite spiral directions. In short, when the liquid refrigerant (or water) passes through this heat exchange tube, due to the change of its inner teeth, the flow state also changes violently to ensure the heat exchange effect.

[0041] As an alternative implementation, the heights of the spiral teeth on the continuous tooth distribution area 2 are the same; or, the heights of the spiral teeth on the continuous tooth distribution area 2 are not completely the same. When the heights of the spiral teeth on the continuous tooth distribution area 2 are not completely the same, there is a certain up-and-down fluctuation when the refrigerant flows in a spiral shape in the continuous tooth distribution area 2, thereby increasing the turbulence intensity inside the tube and improving the heat exchange performance.

[0042] As an alternative implementation, regarding the inner teeth on the dot tooth distribution area 1, the specific description is as follows: The inner teeth on the dot tooth distribution area 1 include large dot teeth 5 and small dot teeth 6. The volume of the large dot teeth 5 is larger than that of the small dot teeth 6, and the height of the large dot teeth 5 is greater than that of the small dot teeth 6. The inner teeth on the dot tooth distribution area 1 can "divide" the fluid, causing the fluid to continuously separate and aggregate, so as to achieve continuous changes in the flow state, thereby improving the heat exchange efficiency. Preferably, the inner teeth on the dot tooth distribution area 1 are pyramid structures with a polygonal bottom surface.

[0043] As an alternative implementation, the large dot teeth 5 and the small dot teeth 6 located on the same spiral line are spaced apart to form a row of spiral dot teeth, and multiple rows of spiral dot teeth are distributed along the circumferential direction of the dot tooth distribution area 1. Further, the dot tooth distribution area 1 includes a first dot distribution area 11 and a second dot distribution area 12 located on one side of the first dot distribution area 11. The spiral directions of the spiral dot teeth on the first dot distribution area 11 and the spiral dot teeth on the second dot distribution area 12 are different. Specifically, refer to Figure 2, the spiral dot teeth on the first dot distribution area 11 and the spiral teeth on the adjacent continuous tooth distribution area 2 have different helix directions, and the spiral dot teeth on the second dot distribution area 12 and the spiral teeth on the adjacent continuous tooth distribution area 2 have different helix directions. See Figure 2 , when the liquid refrigerant (or water) flows through the continuous tooth distribution area 2, the first dot distribution area 11, the second dot distribution area 12, and another continuous tooth distribution area 2 in sequence, due to the different helix directions of each area, the fluid motion state changes, thereby further increasing the turbulence intensity in the pipe.

[0044] Embodiment 1:

[0045] The present invention provides a heat exchange tube, including a heat exchange tube body. Inner teeth are provided on the inner side of the heat exchange tube body. A part of the inner side surface of the heat exchange tube body is a dot tooth distribution area 1, and several inner teeth on the dot tooth distribution area 1 are in a dot convex structure and are spaced apart on the dot tooth distribution area 1. A part of the inner side surface of the heat exchange tube body is a continuous tooth distribution area 2, and the inner teeth on the continuous tooth distribution area 2 are spiral teeth or annular teeth. See Figure 1 , preferably, a dot tooth distribution area 1 is provided between two continuous tooth distribution areas 2. The helix directions of the spiral teeth of the two continuous tooth distribution areas 2 adjacent to the dot tooth distribution area 1 are opposite. The helix angle α of the inner teeth on the continuous tooth distribution area 2 is 0° to 90°, and the preferred value is 45°.

[0046] Two or more adjacent spiral teeth among the inner teeth on the continuous tooth distribution area 2 form a spiral tooth group. The inner teeth on the continuous tooth distribution area 2 are composed of multiple spiral tooth groups. The height of one of the spiral teeth in the spiral tooth group is greater than the heights of the other spiral teeth in the spiral tooth group. Regarding the spiral tooth group, specifically as follows: See Figure 3 , the spiral tooth group includes an intermediate spiral tooth 3 and side spiral teeth 4. The two side spiral teeth 4 are symmetrically distributed on both sides of the intermediate spiral tooth 3, and the height of the intermediate spiral tooth 3 is greater than the height of the side spiral teeth 4.

[0047] The root width L1 of the intermediate spiral tooth 3 ranges from 0.2 mm to 1 mm, and the preferred value is 0.4 mm; the tooth height h1 of the intermediate spiral tooth 3 ranges from 0.4 mm to 1 mm, and the preferred value is 0.8 mm.

[0048] The root width L2 of the side spiral tooth 4 is 0.2 mm to 1 mm, and the preferred value is 0.4 mm; the tooth height h2 of the side spiral tooth 4 is 0.2 mm to 0.8 mm, and the preferred value is 0.6 mm.

[0049] See Figure 1 , the cross-section of the intermediate spiral tooth 3 perpendicular to the heat exchange tube is an isosceles triangle; the cross-section of the side spiral tooth 4 perpendicular to the heat exchange tube is an obtuse triangle and the tooth tip of the side spiral tooth 4 approaches the intermediate spiral tooth 3.

[0050] Regarding the internal teeth on the dot-shaped tooth distribution area 1, the details are as follows: The internal teeth on the dot-shaped tooth distribution area 1 include large dot-shaped teeth 5 and small dot-shaped teeth 6. The volume of the large dot-shaped teeth 5 is larger than that of the small dot-shaped teeth 6, and the height of the large dot-shaped teeth 5 is greater than that of the small dot-shaped teeth 6.

[0051] Regarding the distribution of the large dot-shaped teeth 5 and the small dot-shaped teeth 6, see Figure 1 and Figure 2 , the dot-shaped tooth distribution area 1 includes a first dot-shaped distribution area 11 and a second dot-shaped distribution area 12 located on one side of the first dot-shaped distribution area 11. The spiral dot-shaped teeth on the first dot-shaped distribution area 11 and the spiral dot-shaped teeth on the second dot-shaped distribution area 12 have different helix directions. Specifically, see Figure 2 , the helix direction of the spiral dot-shaped teeth on the first dot-shaped distribution area 11 is different from that of the spiral teeth on the adjacent continuous tooth distribution area 2, and the helix direction of the spiral dot-shaped teeth on the second dot-shaped distribution area 12 is different from that of the spiral teeth on the adjacent continuous tooth distribution area 2. See Figure 2 , the internal teeth on the dot-shaped tooth distribution area 1 are of a quadrangular pyramid structure. The major axis of the bottom surface of the large dot-shaped teeth 5 is along the corresponding spiral direction, and the major axis of the bottom surface of the small dot-shaped teeth 6 may not be along the corresponding spiral direction. When the liquid refrigerant (or water) flows through the first dot-shaped distribution area 11, the internal teeth have become discontinuous and staggered quadrangular pyramid teeth. Due to its multiple sharp edges and the large dot-shaped teeth 5 and small dot-shaped teeth 6 with different heights being distributed at a certain angle, the fluid can be "divided" in multiple directions, causing the fluid to continuously separate and aggregate to achieve continuous changes in the flow state. When the liquid refrigerant (or water) flows through the second dot-shaped distribution area 12, the orientation of the internal teeth changes at this time, and the flow state of the fluid will also change. At the same time, the fluid continues to be divided, showing a continuous situation of separation and convergence.

[0052] The large dot-shaped teeth 5 are of a quadrangular pyramid structure. The range of the length L3 in the major axis direction of the bottom surface of the large dot-shaped teeth 5 is 0.6 mm to 2 mm, and the preferred value is 1.2 mm. The range of the tooth height h3 of the large dot-shaped teeth 5 is 0.4 mm to 1 mm, and the preferred value is 0.8 mm.

[0053] The small dot-shaped teeth 6 are of a quadrangular pyramid structure. The range of the length L4 in the major axis direction of the bottom surface of the small dot-shaped teeth 6 is 0.4 mm to 1.6 mm, and the preferred value is 1 mm. The range of the tooth height h4 of the small dot-shaped teeth 6 is 0.2 mm to 0.8 mm, and the preferred value is 0.6 mm.

[0054] Example 2:

[0055] A heat exchanger includes the heat exchange tubes described in Embodiment 1 of the present invention. The inner side of the heat exchange tubes includes both a continuous tooth distribution area 2 and a dot tooth distribution area 1. Preferably, the dot tooth distribution area 1 is arranged between two continuous tooth distribution areas 2. The specific description is as follows: When the liquid refrigerant (or water) flows through the continuous tooth distribution area 2, due to the (continuous) spiral teeth being spirally distributed, flow channels are formed between the spiral teeth, resulting in the fluid flowing in a spiral manner. When the liquid refrigerant (or water) flows through the dot tooth distribution area 1, since the inner tooth spiral angle in the dot tooth distribution area 1 changes and the continuous teeth become discontinuous teeth, the motion state of the fluid flowing in a spiral manner at this time changes, thereby further increasing the turbulence intensity inside the tube. When the liquid refrigerant (or water) flows to the next continuous tooth distribution area 2, the flow state at this time is similar to that of the previous continuous tooth distribution area 2. In short, when the liquid refrigerant (or water) passes through this heat exchange tube, due to the change of its inner teeth, the flow state thereof also changes drastically to ensure the heat exchange effect.

[0056] Embodiment 3:

[0057] An air conditioning device includes the heat exchange tubes described in Embodiment 1 of the present invention.

[0058] As described above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A heat exchange tube, comprising a heat exchange tube body, wherein internal teeth are arranged on the inner side of the heat exchange tube body, and it is characterized in that, Part of the inner side of the heat exchange tube body is a dot-shaped tooth distribution area (1), and several inner teeth on the dot-shaped tooth distribution area (1) are in dot-shaped convex structures and are spaced apart on the dot-shaped tooth distribution area (1); The inner teeth on the dot-shaped tooth distribution area (1) include large dot-shaped teeth (5) and small dot-shaped teeth (6), and the volume of the large dot-shaped teeth (5) is larger than the volume of the small dot-shaped teeth (6); The inner teeth on the dot-shaped tooth distribution area (1) are pyramid structures with a polygonal bottom surface; Part of the inner side of the heat exchange tube body is a continuous tooth distribution area (2), and the inner teeth on the continuous tooth distribution area (2) are spiral teeth or annular teeth; The dot-shaped tooth distribution area (1) is arranged between two continuous tooth distribution areas (2); The spiral directions of the spiral teeth in the two continuous tooth distribution areas (2) adjacent to the dot-shaped tooth distribution area (1) are opposite; The dot-shaped tooth distribution area (1) includes a first dot-shaped distribution area (11) and a second dot-shaped distribution area (12) located on one side of the first dot-shaped distribution area (11), and the spiral directions of the spiral dot-shaped teeth on the first dot-shaped distribution area (11) and the spiral dot-shaped teeth on the second dot-shaped distribution area (12) are different; The spiral direction of the spiral dot-shaped teeth on the first dot-shaped distribution area (11) is different from the spiral direction of the spiral teeth on the continuous tooth distribution area (2) adjacent thereto, and the spiral direction of the spiral dot-shaped teeth on the second dot-shaped distribution area (12) is different from the spiral direction of the spiral teeth on the continuous tooth distribution area (2) adjacent thereto.

2. The heat exchange tube according to claim 1, wherein The heights of the spiral teeth on the continuous tooth distribution area (2) are the same; or, the heights of the spiral teeth on the continuous tooth distribution area (2) are not completely the same.

3. The heat exchange tube according to claim 2, wherein Among the inner teeth on the continuous tooth distribution area (2), two or more adjacent spiral teeth form a spiral tooth group, and the inner teeth on the continuous tooth distribution area (2) are composed of multiple spiral tooth groups, and the height of one of the spiral teeth in the spiral tooth group is greater than the heights of the other spiral teeth in the spiral tooth group.

4. The heat exchange tube according to claim 3, characterized in that, The spiral tooth group includes an intermediate spiral tooth (3) and side spiral teeth (4), and the two side spiral teeth (4) are symmetrically distributed on both sides of the intermediate spiral tooth (3), and the height of the intermediate spiral tooth (3) is greater than the height of the side spiral teeth (4).

5. The heat exchange tube according to claim 4, wherein, The root width L1 of the intermediate spiral tooth (3) ranges from 0.2 mm to 1 mm; the tooth height h1 of the intermediate spiral tooth (3) ranges from 0.4 mm to 1 mm.

6. The heat exchange tube according to claim 4, wherein, The root width L2 of the side spiral tooth (4) is 0.2 mm to 1 mm; the tooth height h2 of the side spiral tooth (4) is 0.2 mm to 0.8 mm.

7. The heat exchange tube according to claim 4, wherein, The cross-section of the intermediate spiral tooth (3) perpendicular to the heat exchange tube is an isosceles triangle; the cross-section of the side spiral tooth (4) perpendicular to the heat exchange tube is an obtuse triangle and the tooth tip of the side spiral tooth (4) approaches the intermediate spiral tooth (3).

8. The heat exchange tube according to claim 1, wherein, The large dot-shaped teeth (5) and the small dot-shaped teeth (6) on the same spiral line are spaced apart to form a row of spiral dot-shaped teeth, and multiple rows of spiral dot-shaped teeth are distributed in the circumferential direction of the dot-shaped tooth distribution area (1).

9. The heat exchange tube according to claim 1, wherein The internal teeth on the dot-shaped tooth distribution area (1) are of a quadrangular pyramid structure. The major axis of the bottom surface of the large dot-shaped tooth (5) is along the corresponding spiral direction; the major axis of the bottom surface of the small dot-shaped tooth (6) is along the corresponding spiral direction or there is an included angle between the major axis direction of the bottom surface of the small dot-shaped tooth (6) and the corresponding spiral direction.

10. The heat exchange tube according to claim 1, characterized in that, The large dot-shaped tooth (5) is of a quadrangular pyramid structure. The range of the length L3 in the major axis direction of the bottom surface of the large dot-shaped tooth (5) is 0.6 mm to 2 mm, and the range of the tooth height h3 of the large dot-shaped tooth (5) is 0.4 mm to 1 mm.

11. The heat exchange tube according to claim 8, wherein, The small dot-shaped tooth (6) is of a quadrangular pyramid structure. The range of the length L4 in the major axis direction of the bottom surface of the small dot-shaped tooth (6) is 0.4 mm to 1.6 mm, and the range of the tooth height h4 of the small dot-shaped tooth (6) is 0.2 mm to 0.8 mm.

12. A heat exchanger, characterized in that, Comprising the heat exchange tube according to any one of claims 1-11.

13. An air conditioning device, characterized in that, Comprising the heat exchange tube according to any one of claims 1-11.

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