Heat exchange tube, heat exchanger and air conditioner

Abstract

The present invention provides a heat exchange tube, a heat exchanger and an air conditioner, wherein the heat exchange tube comprises: a tube base (1) and a V-shaped tooth (2) arranged on the inner wall of the tube base (1), wherein the V-shaped tooth (2) is a tooth structure protruding and extending inward from the inner wall of the tube base (1), and in a cross section perpendicular to the extension direction of the V-shaped tooth (2), the shape of the V-shaped tooth (2) is V-shaped. The present invention can effectively reduce the thickness of the boundary layer of the fluid in the heat exchange tube, thereby improving the turbulence of the fluid and effectively strengthening the heat exchange in the tube, without increasing the flow rate to enhance the heat exchange as in the prior art, thereby avoiding the problem of excessive pressure drop.

Description

Technical Field

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

[0002] In commercial shell and tube heat exchangers, the heat transfer performance of high-efficiency heat exchange tubes greatly affects the overall energy efficiency of the unit. In order to improve the heat transfer performance of heat exchange tubes, researchers generally focus their research on the development and optimization of the outer tooth structure of the tube whose heat transfer mode is phase change heat transfer. For related enhancement measures inside the tube, since its heat transfer state is non-phase change heat transfer, the heat transfer is mainly enhanced by forced convection. Generally, the heat transfer enhancement performance inside the tube is improved by strengthening the turbulent flow in the tube and thinning the boundary layer to reduce the thermal resistance. Commonly used methods are to increase the flow rate of the fluid in the tube and use internal teeth with higher tooth height, but these two methods have the problem of excessive pressure drop at the inlet and outlet of the fluid in the tube and the tooth height limit of the existing internal tooth processing method.

[0003] Since the conventional heat exchange tubes use the method of increasing the fluid flow rate to enhance the heat exchange in the tube, which may result in excessive pressure drop, and the conventional processing method of the inner teeth of the heat exchange tube cannot break through the processing limit and other technical problems, the present invention studies and designs a heat exchange tube, a heat exchanger and an air conditioner. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of excessive pressure drop in the prior art heat exchange tubes that use the method of increasing the fluid flow rate to enhance the heat exchange in the tubes, thereby providing a heat exchange tube, a heat exchanger and an air conditioner.

[0005] The present invention provides a heat exchange tube, comprising:

[0006] A tube base and V-shaped teeth arranged on the inner wall of the tube base, wherein the V-shaped teeth are tooth structures protruding inwardly from the inner wall of the tube base, and in a cross section perpendicular to the extension direction of the V-shaped teeth, the shape of the V-shaped teeth is V-shaped.

[0007] Preferably,

[0008] In the cross section: the V-shaped tooth includes a first extension arm and a second extension arm, the first extension arm and the second extension arm intersect to form a pointed tip at one end of the intersection and a flared opening at the other end.

[0009] Preferably,

[0010] The flaring angle θ of the V-shaped tooth is 15°-60°; and / or, the vertical distance from the tip to the flare is the tooth length h1, and h1 is 0.2mm-1.0mm; and / or, the overlapping length h2 of the first extension arm and the second extension arm at the tip is 0.02mm-0.1mm.

[0011] Preferably,

[0012] In the cross section of the tube base: the tooth width L1 of the V-shaped tooth is 0.2mm-0.6mm; and / or the tooth height h3 of the V-shaped tooth is 0.2mm-0.8mm; and / or the cross-sectional width L2 of the first extension arm or the second extension arm is 0.2mm-0.6mm.

[0013] Preferably,

[0014] The V-shaped teeth are multiple:

[0015] At the same axial position of the tube substrate, a plurality of V-shaped teeth are arranged along the circumference of the tube substrate to form a row of teeth; and / or a plurality of V-shaped teeth are arranged along the axial direction of the tube substrate to form multiple rows of teeth.

[0016] Preferably,

[0017] In the same row of teeth, the arrangement of the plurality of V-shaped teeth is the same, the pointed ends of the V-shaped teeth are all oriented in the same direction, and the flared ends of the V-shaped teeth are all oriented in another same direction.

[0018] Preferably,

[0019] In the same row of teeth, the tips of the multiple V-shaped teeth are all facing one side of the tube base body along the axial direction, and the flared ends of the multiple V-shaped teeth are all facing the other side of the tube base body along the axial direction.

[0020] Preferably,

[0021] In two adjacent rows of teeth, the pointed tips of the multiple V-shaped teeth in one row of teeth are oriented in the opposite direction to the pointed tips of the multiple V-shaped teeth in the other row of teeth; and / or, in two adjacent rows of teeth, the multiple V-shaped teeth in one row of teeth are staggered with the multiple V-shaped teeth in the other row of teeth.

[0022] Preferably,

[0023] The axial distance L3 between two adjacent rows of teeth in the same direction is 0.5 mm-3.0 mm; and / or, the minimum axial distance L4 between two adjacent rows of teeth is 0.1 mm-0.5 mm; and / or, the V-shaped teeth are evenly distributed in the circumferential direction, and the number is 30-60.

[0024] Preferably,

[0025] In the same row of teeth, a plurality of the V-shaped teeth are first arranged to form a tooth unit, and a plurality of the tooth units are first arranged in the circumferential direction to form a row of teeth, and then arranged in the axial direction of the tube base to form multiple rows of teeth.

[0026] Preferably,

[0027] The protruding heights of each part of a single V-shaped tooth are consistent; or the protruding heights of each part of a single V-shaped tooth are variable in the axial direction of the tube substrate.

[0028] Preferably,

[0029] When the protruding height of the V-shaped tooth is variable in the axial direction of the tube base body, the protruding height of the tip of the V-shaped tooth is higher than the protruding height of the flared mouth of the V-shaped tooth.

[0030] Preferably,

[0031] The protruding height of the tip of the V-shaped tooth is h4, the protruding height of the flared mouth of the V-shaped tooth is h3, and the value of h4:h3 is 1-4; and / or, the protruding height of the V-shaped tooth gradually increases from the flared mouth to the tip.

[0032] The present invention also provides a heat exchanger, comprising the heat exchange tube as described in any of the preceding items.

[0033] The present invention also provides an air conditioner, which comprises the heat exchange tube or the aforementioned heat exchanger as described in any of the preceding items.

[0034] The heat exchange tube, heat exchanger and air conditioner provided by the present invention have the following beneficial effects:

[0035] 1. The present invention provides a V-shaped tooth structure protruding and extending inward on the inner wall of the tube matrix of the heat exchange tube. When the non-phase-change fluid flows through the inner wall of the heat exchange tube, the tooth height of the V-shaped tooth on the heat exchange tube becomes larger than the original inner wall, and the fluid boundary layer near the wall of the heat exchange tube is stretched thinner, thereby reducing the heat transfer thermal resistance. Therefore, the thickness of the fluid boundary layer in the heat exchange tube can be effectively reduced, thereby increasing the turbulence of the fluid and effectively strengthening the heat exchange in the tube. It is no longer necessary to increase the flow rate to enhance the heat exchange as in the prior art, thus avoiding the problem of excessive pressure drop.

[0036] 2. In the present invention, since the same row of teeth is arranged circumferentially, the fluids at the tails of adjacent teeth impact each other, thereby increasing the turbulence of the fluid there. Since multiple rows of teeth are arranged axially and the expansion directions are opposite, when the fluid flows to the latter group of V-shaped teeth, since the opening direction is opposite to that of the former group, the fluid is reversely blocked, which further strengthens the fluid disturbance and prolongs the time for the fluid to pass over the inner tube, thereby enhancing the heat exchange. In addition, the use of intermittent V-shaped teeth transforms the two-dimensional flow into the three-dimensional flow, which not only strengthens the disturbance, but also helps to reduce the pressure drop in the tube, thereby improving the overall performance of the heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A three-dimensional structural diagram of a partial section of a heat exchange tube of the present invention;

[0038] Figure 2 is an axial cross-sectional view of the heat exchange tube of the present invention;

[0039] Figure 3 A tooth shape dimension diagram of a V-shaped tooth of a heat exchange tube of the present invention;

[0040] Figure 4 It is a three-dimensional structural diagram of an alternative embodiment of a partial section of a heat exchange tube of the present invention.

[0041] The reference numerals in the figure are as follows:

[0042] 1. Tube base; 2. V-shaped teeth; 21. First extension arm; 22. Second extension arm; 23. Pointed head; 24. Expanded mouth. DETAILED DESCRIPTION

[0043] like Figure 1-4 As shown, the present invention provides a heat exchange tube, which includes:

[0044] A tube base body 1 and a V-shaped tooth 2 arranged on the inner wall of the tube base body 1, wherein the V-shaped tooth 2 is a tooth structure protruding inwardly from the inner wall of the tube base body 1, and in a cross section perpendicular to the extension direction of the V-shaped tooth 2, the shape of the V-shaped tooth 2 is V-shaped.

[0045] The present invention provides a V-shaped tooth structure protruding and extending inward on the inner wall of the tube base of the heat exchange tube. When the non-phase change fluid flows through the inner wall of the heat exchange tube, the tooth height of the V-shaped teeth on the heat exchange tube becomes larger than the original inner wall, and the fluid boundary layer near the wall of the heat exchange tube is stretched thinner, thereby reducing the heat transfer thermal resistance. Therefore, the thickness of the fluid boundary layer in the heat exchange tube can be effectively reduced, thereby increasing the turbulence of the fluid and effectively strengthening the heat exchange in the tube. There is no need to increase the flow rate to enhance the heat exchange as in the prior art, thus avoiding the problem of excessive pressure drop.

[0046] The invention provides a high-efficiency heat exchange tube with V-shaped inner teeth, which strengthens the heat exchange in the tube by machining V-shaped teeth on the inner wall of the heat exchange tube to reduce the thickness of the fluid boundary layer in the heat exchange tube and increase the turbulence degree of the fluid in the tube.

[0047] Preferably,

[0048] In the cross section: the V-shaped tooth 2 includes a first extension arm 21 and a second extension arm 22, the first extension arm 21 and the second extension arm 22 intersect to form a pointed head 23 at one end of the intersection and a flared opening 24 at the other end. This is a further preferred structural form of the V-shaped tooth of the present invention, which is formed by connecting two extension arms to form a V-shaped tooth, and can introduce the fluid into the space sandwiched by the tooth at the flared part of the V-shaped tooth, and gradually shrink it to tear the boundary layer at the tip, thereby effectively reducing the thickness of the boundary layer and increasing the degree of turbulence; or when the fluid flows from the tip to the flared direction, the fluid is divided into two paths at the tip and mixed with the adjacent fluid, which can also play a role in reducing the thickness of the boundary layer.

[0049] Preferably,

[0050] The flaring angle θ of the V-shaped tooth is 15°-60°, preferably 45°. ; and / or, the vertical distance between the tip 23 and the flare 24 is the tooth length h1, and h1 is 0.2mm-1.0mm, preferably 0.6mm; and / or, the overlap length h2 of the first extension arm 21 and the second extension arm 22 at the tip 23 is 0.02mm-0.1mm, preferably 0.05mm. This is the preferred structural form of the V-shaped tooth of the present invention, that is, its flaring angle, the tooth length between the tip and the flare, the length of the overlap of the two extension arms at the tip, the flaring angle of the V-shaped tooth should be an acute angle, which can increase the drainage and aggregation effect of the fluid, increase the flow rate, and help reduce the thickness of the boundary layer; the tooth length is relatively small, which can enhance the turbulence of the fluid at multiple locations through multiple small V-shaped teeth, weaken the overall boundary layer, and improve the heat exchange effect.

[0051] Preferably,

[0052] In the cross section of the tube base 1: the tooth width L1 of the V-shaped tooth is 0.2mm-0.6mm, preferably 0.4mm; and / or, the tooth height h3 of the V-shaped tooth is 0.2mm-0.8mm, preferably 0.6mm; and / or, the cross-sectional width L2 of the first extension arm 21 or the second extension arm 22 is 0.2mm-0.6mm, preferably 0.4mm. This is a further preferred size range of the V-shaped tooth of the present invention, which can limit the V-shaped tooth in terms of width and height, and further enhance the effect of reducing the boundary layer. The width should not be too wide, otherwise it will reduce the fluid flow rate, and it should not be too narrow, otherwise the flow rate of the fluid entering the flared port will be insufficient. The height should not be too high to prevent excessive fluid resistance from affecting normal flow and increasing losses. The height should not be too low to prevent the weakening effect of the boundary layer of the fluid from being insignificant.

[0053] Preferably,

[0054] The V-shaped teeth 2 are multiple:

[0055] At the same axial position of the tube base 1, the multiple V-shaped teeth 2 are arranged along the circumference of the tube base 1 to form a row of teeth; and / or, the multiple V-shaped teeth 2 are arranged along the axial direction of the tube base 1 to form multiple rows of teeth.

[0056] This is the preferred structural form of the V-shaped teeth of the present invention, that is, a plurality of V-shaped teeth, and an arrangement form of one row of circumferential teeth and an arrangement form of multiple rows of teeth in the axial direction, which can produce a weakening effect on the fluid boundary layer in both the circumferential and circumferential directions of the inner wall of the tube, effectively increase the enhancement intensity of the overall turbulence of the fluid in the tube, and improve the heat exchange effect.

[0057] Preferably,

[0058] In the same row of teeth, the arrangement of the multiple V-shaped teeth 2 is the same, the pointed ends of the V-shaped teeth are all facing the same direction, and the flared ends of the V-shaped teeth are all facing the same direction. This is the preferred arrangement form of the V-shaped teeth in the same row of teeth of the present invention, that is, the directions are all the same, so that the same turbulence enhancement effect can be achieved on the V-shaped teeth flowing through the same axial position, making the turbulence of the fluid in the tube more uniform and improving the heat exchange effect. Since the same row of teeth is arranged circumferentially, the fluids at the tails of adjacent teeth in the circumferential direction impact each other, which increases the turbulence of the fluid here.

[0059] Preferably,

[0060] In the same row of teeth, the tips of the multiple V-shaped teeth 2 are all facing one side of the tube base 1 in the axial direction, and the flared openings of the multiple V-shaped teeth 2 are all facing the other side of the tube base 1 in the axial direction. This is a further preferred arrangement form of the V-shaped teeth in the same row of teeth of the present invention, that is, they are all facing the same direction and arranged along the axial direction of the tube. Since the fluid flows in the axial direction, this can further enhance the same turbulent effect on the V-shaped teeth flowing through the same axial position, thereby improving the heat exchange effect.

[0061] Preferably,

[0062] In two adjacent rows of teeth, the pointed directions of the multiple V-shaped teeth 2 in one row of teeth are opposite to the pointed directions of the multiple V-shaped teeth 2 in the other row of teeth; and / or, in two adjacent rows of teeth, the multiple V-shaped teeth 2 in one row of teeth are staggered with the multiple V-shaped teeth 2 in the other row of teeth. Since the multiple rows of teeth are arranged in the axial direction and the expansion directions are opposite, when the fluid flows to the latter group of V-shaped teeth, the opening direction is opposite to that of the former group, which has a reverse blocking effect on the fluid, further strengthening the fluid disturbance, and prolonging the time for the fluid to pass over the inner tube, thereby strengthening the heat exchange.

[0063] Figure 1 In the heat exchange tube, the inner teeth are set to increase the heat exchange area of ​​the inner wall of the heat exchange tube. When the non-phase change fluid flows through the inner wall of the heat exchange tube, due to the large tooth height on the heat exchange tube, the fluid boundary layer near the wall of the heat exchange tube is stretched thinner, reducing the heat transfer thermal resistance; at the same time, the fluids at the tails of the circumferentially adjacent teeth impact each other, increasing the turbulence of the fluid here; when the fluid flows to the latter group of V-shaped teeth, since the opening direction is opposite to that of the former group, it has a reverse blocking effect on the fluid, which further strengthens the fluid disturbance and prolongs the time for the fluid to pass over the inner tube, thereby strengthening the heat exchange. The use of intermittent V-shaped teeth transforms the two-dimensional flow into a three-dimensional flow, which not only enhances the turbulence, but also helps to reduce the pressure drop in the tube and improve the overall performance of the heat exchange tube.

[0064] Preferably,

[0065] The distance L3 between two adjacent rows of teeth in the same direction in the axial direction is 0.5mm-3.0mm, preferably 1.5mm; and / or, the minimum distance L4 between two adjacent rows of teeth in the axial direction is 0.1mm-0.5mm, preferably 0.2mm; and / or, the V-shaped teeth are evenly distributed in the circumferential direction, the number is 30-60, and the preferred number is 45. This is the specific size of the axial distance between the same row of teeth and two adjacent rows of teeth in the present invention, as well as the preferred number of V-shaped teeth, which can ensure that the V-shaped teeth are intermittently distributed in the axial direction, and can make the thickness of the boundary layer of the fluid after passing through the V-shaped teeth in the axial direction maintain a certain axial distance, and then pass through the next section of V-shaped teeth, so as to prevent the boundary layer from increasing due to the long length of the boundary layer passing through the straight inner wall, and this intermittent arrangement can reduce the boundary layer, increase the degree of turbulence, and reduce the layout cost; the use of intermittent V-shaped teeth themselves can transform the two-dimensional flow into a three-dimensional flow, which not only enhances the turbulence, but also helps to reduce the pressure drop in the tube and improve the overall performance of the heat exchange tube.

[0066] The V-shaped teeth are distributed linearly along the axial direction, and the front and rear rows of circumferential teeth are staggered in opposite directions. The axial distance L3 of teeth in the same direction is 0.5mm-3.0mm, preferably 1.5mm; the axial distance L4 of teeth facing each other in opposite directions is 0.1mm-0.5mm, preferably 0.2mm. The V-shaped teeth are evenly distributed in the circumferential direction, with a number of 30-60, preferably 45. Figure 3 The angle θ of the V-shaped teeth is 15°-60°, preferably 45°. The tooth length h1 in the top view is 0.2mm-1.0mm, preferably 0.6mm; the overlapping tooth length h2 of the two oblique teeth forming the V-shaped teeth is 0.02mm-0.1mm, preferably 0.05mm. Figure 1 In the embodiment, the tooth width L1 is 0.2mm-0.6mm, preferably 0.4mm; since rolling processing can be adopted, the tooth height h3 can be 0.2mm-0.8mm, preferably 0.6mm; and its cross-sectional width L2 is 0.2mm-0.6mm, preferably 0.4mm.

[0067] Preferably,

[0068] like Figure 4 As shown, in the same row of teeth, a plurality of the V-shaped teeth 2 are first arranged to form a tooth unit, and a plurality of the tooth units are first arranged in the circumferential direction to form a row of teeth, and then arranged in the axial direction of the tube substrate 1 to form multiple rows of teeth. This is a further preferred arrangement form of multiple teeth in an alternative embodiment of the present invention. In addition to being distributed individually on the inner wall of the heat exchange tube, the V-shaped teeth can also be distributed in clusters and then linearly distributed in the axial direction, which can further enhance the ability to weaken the boundary layer of the fluid and improve the turbulence ability, such as Figure 4 As shown, the tips of three V-shaped teeth are relatively distributed, and the angle between the teeth is 120°.

[0069] Preferably,

[0070] In a single V-shaped tooth 2, the protrusion height at each location is consistent (e.g. Figure 3 Forward View Figure 1 ); or a single V-shaped tooth 2, the protrusion height of each part of the tube substrate 1 is variable in the axial direction (such as Figure 3 Forward View Figure 2 ). This is the preferred structural form of the single V-shaped tooth of the present invention. Figure 3 Forward View Figure 1 The figure shows the case where the protrusion height is consistent. Figure 2 The middle one is the case of inconsistent protrusion heights, which is another form of formation. It can increase the disturbing effect on the fluid, weaken the boundary layer effect more strongly, and have a better turbulence enhancement effect.

[0071] Preferably,

[0072] When the protruding height of the V-shaped tooth 2 is variable in the axial direction of the tube base 1, the protruding height of the tip of the V-shaped tooth 2 is higher than the protruding height of the flared mouth of the V-shaped tooth 2. This is a preferred structural form of the V-shaped tooth with variable protruding height of the present invention, and the tip height is higher than the protruding height of the flared mouth, which can shrink and gather the fluid when it flows from the flared mouth to the tip, and tear the boundary layer of the tooth at the tip, and the effect of weakening the boundary layer is stronger.

[0073] Preferably,

[0074] The protruding height of the tip of the V-shaped tooth 2 is h4, the protruding height of the flared opening of the V-shaped tooth 2 is h3, and the value of h4:h3 is 1-4; and / or, the protruding height of the V-shaped tooth 2 gradually increases from the flared opening to the tip. The preferred structural form in which the protruding height of the V-shaped tooth is variable, the protruding height gradually increases from the flared opening to the tip and the value of h4:h3 is 1-4, can further make the fluid be contracted and gathered when it flows from the flared opening to the tip, improve the uniformity of the fluid, increase the tearing degree of the boundary layer of the tooth at the tip, and have a stronger effect of weakening the boundary layer.

[0075] The present invention also provides a heat exchanger, which includes the heat exchange tube described in any of the preceding items. The present invention provides a V-shaped tooth structure protruding and extending inward on the inner wall of the tube base of the heat exchange tube. When the non-phase-changing fluid flows through the inner wall of the heat exchange tube, the tooth height of the V-shaped teeth on the heat exchange tube becomes larger than the original inner wall, and the fluid boundary layer near the wall of the heat exchange tube is stretched thinner, thereby reducing the heat transfer thermal resistance. Therefore, the thickness of the fluid boundary layer in the heat exchange tube can be effectively reduced, thereby increasing the turbulence of the fluid and effectively strengthening the heat exchange in the tube.

[0076] The present invention also provides an air conditioner, which includes the heat exchange tube or the aforementioned heat exchanger as described in any of the preceding items. The present invention develops a high-efficiency heat exchange tube with V-shaped internal teeth; reduces the thickness of the boundary layer of the fluid in the heat exchange tube while increasing the turbulence of the fluid; reduces the thickness of the boundary layer near the wall of the heat exchange tube; and increases the turbulence of the fluid flow in the heat exchange tube without increasing the flow rate.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A heat exchange tube, characterized in that: include: A tube base (1) and a V-shaped tooth (2) arranged on the inner wall of the tube base (1), wherein the V-shaped tooth (2) is a tooth structure protruding inwardly from the inner wall of the tube base (1), and in a cross section perpendicular to the extension direction of the V-shaped tooth (2), the shape of the V-shaped tooth (2) is V-shaped; In the cross section: the V-shaped tooth (2) comprises a first extension arm (21) and a second extension arm (22); the first extension arm (21) and the second extension arm (22) intersect to form a pointed head (23) at one end of the intersection and a flared opening (24) at the other end; The protruding height of each part of a single V-shaped tooth (2) is variable in the axial direction of the tube base (1); when the protruding height of the V-shaped tooth (2) is variable in the axial direction of the tube base (1), the protruding height of the tip of the V-shaped tooth (2) is higher than the protruding height of the expanded opening of the V-shaped tooth (2); the protruding height of the V-shaped tooth (2) gradually increases from the expanded opening to the tip; The V-shaped teeth (2) are multiple: At the same axial position of the tube base (1), a plurality of the V-shaped teeth (2) are arranged along the circumference of the tube base (1) to form a row of teeth; and a plurality of the V-shaped teeth (2) are arranged along the axial direction of the tube base (1) to form multiple rows of teeth; In two adjacent rows of teeth, the directions of the tips of the plurality of V-shaped teeth (2) in one row of teeth are opposite to the directions of the tips of the plurality of V-shaped teeth (2) in the other row of teeth.

2. The heat exchange tube according to claim 1, characterized in that: The flaring angle θ of the V-shaped tooth is 15°-60°; and / or the vertical distance between the tip (23) and the flared opening (24) is the tooth length h1, and h1 is 0.2 mm-1.0 mm; and / or the overlapping length h2 of the first extension arm (21) and the second extension arm (22) at the tip (23) is 0.02 mm-0.1 mm.

3. The heat exchange tube according to claim 1, characterized in that: In the cross section of the tube base (1): the tooth width L1 of the V-shaped tooth is 0.2 mm-0.6 mm; and / or the tooth height h3 of the V-shaped tooth is 0.2 mm-0.8 mm; and / or the cross-sectional width L2 of the first extension arm (21) or the second extension arm (22) is 0.2 mm-0.6 mm.

4. The heat exchange tube according to claim 1, characterized in that: In the same row of teeth, the plurality of V-shaped teeth (2) are arranged in the same manner, the pointed ends of the V-shaped teeth are all oriented in the same direction, and the flared ends of the V-shaped teeth are all oriented in another same direction.

5. The heat exchange tube according to claim 4, characterized in that: In the same row of teeth, the tips of the plurality of V-shaped teeth (2) are all facing one side of the tube base body (1) in the axial direction, and the flared ends of the plurality of V-shaped teeth (2) are all facing the other side of the tube base body (1) in the axial direction.

6. The heat exchange tube according to claim 1, characterized in that: In two adjacent rows of teeth, the plurality of V-shaped teeth (2) in one row of teeth are distributed in a staggered manner with the plurality of V-shaped teeth (2) in the other row of teeth.

7. The heat exchange tube according to claim 6, characterized in that: The axial distance L3 between two adjacent rows of teeth in the same direction is 0.5 mm-3.0 mm; and / or, the minimum axial distance L4 between two adjacent rows of teeth is 0.1 mm-0.5 mm; and / or, the V-shaped teeth are evenly distributed in the circumferential direction, and the number is 30-60.

8. The heat exchange tube according to claim 1, characterized in that: In the same row of teeth, a plurality of the V-shaped teeth (2) are first arranged to form a tooth unit, and a plurality of the tooth units are first arranged in the circumferential direction to form a row of teeth, and then arranged in the axial direction of the tube base (1) to form multiple rows of teeth.

9. The heat exchange tube according to claim 1, characterized in that: The protruding height of the tip of the V-shaped tooth (2) is h4, the protruding height of the expanded mouth of the V-shaped tooth (2) is h3, and the value of h4:h3 is 1-4.

10. A heat exchanger, characterized in that: The heat exchange tube comprises the heat exchange tube according to any one of claims 1 to 9.

11. An air conditioner, characterized in that: The heat exchanger comprises the heat exchange tube according to any one of claims 1 to 9 or the heat exchanger according to claim 10.

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