Heat exchange profile with internal teeth and high corrugated fins

Abstract

The utility model belongs to heat exchange section bar technical field, a kind of heat exchange section bar with inner tooth and high corrugated fin, including section bar main body, inner wall double-turbulence structure and outer wall high corrugated fin structure, after heat exchange medium is transported to the fluid passage of section bar main body, it flows along channel axial direction;During the flow process, the inner tooth of inner wall gradual change height is adapted to the change of medium flow rate, and the low inner tooth of inlet section reduces initial resistance, and subsequent gradual high inner tooth cooperates variable cross-section guide clearance to destroy laminar boundary layer, and the spiral micro-groove on the surface of inner tooth (with the medium flow direction 30 °-60 ° angle, circumferential spin direction is alternated) guide fluid to form spiral flow, promote radial heat exchange.Meanwhile, medium heat is transferred to outer wall wave-shaped fin unit through section bar main body, and small convex point on the surface of fin destroys air boundary layer, induces micro eddy current, cooling airflow passes through the gap between adjacent fin units smoothly, heat is quickly taken away, and finally high-efficiency heat exchange cycle is completed.

Description

Technical Field

[0001] This utility model belongs to the technical field of heat exchange profiles, specifically a heat exchange profile with internal teeth and high-corrugated fins. Background Technology

[0002] In the fields of refrigeration, air conditioning, and chemical industry, condensers, evaporators, and evaporative condensers are the core equipment for heat transfer. The heat exchange profiles (such as aluminum tubes and copper tubes) inside the equipment serve as the key carriers for heat exchange, and their structural design directly determines the heat exchange efficiency.

[0003] Currently, most common heat exchange profiles on the market are round or square tubes with smooth inner walls, with fins added externally through welding or bonding to expand the heat dissipation area. However, this traditional structure has significant drawbacks: First, the smooth inner wall makes it easy for fluids (such as refrigerant or coolant) to flow in laminar flow, with heat being transferred slowly only through the tube wall, resulting in low heat exchange efficiency. Second, the external fins are connected to the pipe separately, which not only increases production processes and costs but also leads to problems with loose bonding between the fins and the pipe, easily generating contact thermal resistance and causing heat transfer loss. In addition, the fins are prone to detachment during long-term use, affecting the service life of the equipment. Third, some profiles with one-piece molded fins often have flat or low-corrugated structures, resulting in limited heat dissipation area and insufficient contact with external air or cooling medium, making it difficult to meet the needs of high-load heat exchange scenarios.

[0004] With the increasing demands for energy efficiency in industrial production, traditional heat exchange profiles can no longer meet the requirements for high efficiency, stability, and long-term use. Therefore, it is urgent to design a new type of heat exchange profile that can simultaneously optimize the fluid flow state inside the pipe, expand the heat dissipation area outside the pipe, and have a stable structure. Summary of the Invention

[0005] To address the problems mentioned in the background art, this utility model provides a heat exchange profile with internal teeth and high corrugated fins. By optimizing the internal and external structure of the pipe, it achieves the dual effects of enhanced fluid turbulence inside the pipe and expanded heat dissipation area outside the pipe, thereby improving the heat exchange efficiency and service life of condensers, evaporators, and evaporative condensers.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a heat exchange profile with internal teeth and high-corrugated fins, characterized in that it includes a profile body, an inner wall double-turbulence structure, and an outer wall high-corrugated fin structure; the profile body has an axially penetrating hollow fluid channel for conveying the heat exchange medium; the inner wall double-turbulence structure is integrally formed on the inner wall of the profile body by an extrusion molding process and extends axially along the fluid channel; the inner wall double-turbulence structure includes multiple circumferentially uniformly distributed internal teeth, the height of which extends from the profile body along the flow direction of the heat exchange medium. The inner diameter gradually changes from 1 / 10 to 1 / 5, and a variable cross-section flow guiding gap is formed between adjacent inner teeth. Each inner tooth has a spiral micro-groove on its outer surface. The spiral direction of the spiral micro-groove is at an angle of 30°-60° with the flow direction of the heat exchange medium, and the spiral micro-grooves of adjacent inner teeth are arranged alternately in the spiral direction. The high-corrugated fin structure on the outer wall is integrally formed on the outer wall of the profile body by extrusion molding process. It is continuously distributed along the axial direction of the profile body and includes multiple circumferentially spaced wavy fin units. The surface of the wavy fin unit is provided with tiny protrusions.

[0007] Optionally, the diameter of the micro-protrusions is 0.5-1mm, the spacing between adjacent micro-protrusions is 2-5mm, and the micro-protrusions are evenly arranged along the corrugated surface of the wavy fin unit.

[0008] Optionally, in the inner wall double turbulence structure, the cross-section of the inner teeth is an isosceles trapezoid, and the top of the inner teeth is provided with a rounded corner with a radius of 0.1-0.3mm; and the tooth spacing of the inner teeth is 1.5-3 times the maximum height of the inner teeth, and the maximum height of the inner teeth is 1 / 5 of the inner diameter of the profile body.

[0009] Optionally, the groove width of the spiral microgroove is 0.2-0.5 mm, the groove depth is 0.1-0.2 mm, and the groove wall of the spiral microgroove smoothly transitions with the outer surface of the inner tooth.

[0010] Optionally, the profile body, the inner wall double turbulence structure, and the outer wall high corrugated fin structure are integrally manufactured through a one-time extrusion molding process, without the need for subsequent assembly processes.

[0011] Optionally, in the outer wall high corrugated fin structure, the corrugation height of the corrugated fin unit is 5-15mm, the corrugation spacing is 8-20mm, and the fin thickness is 0.3-1mm; an airflow gap is formed between two adjacent corrugated fin units in the circumferential direction, and the width of the airflow gap is 3-8mm.

[0012] Optionally, the cross-sectional shape of the profile body is circular, elliptical, or regular polygonal; when the cross-section is a regular polygonal, it has 4-8 sides, and each side is provided with at least one wavy fin unit.

[0013] Optionally, a transition fillet is provided at the connection between the inner tooth and the inner wall of the profile body. The radius of the transition fillet is 1 / 3 to 1 / 2 of the minimum height of the inner tooth, and the minimum height of the inner tooth is 1 / 10 of the inner diameter of the profile body. The surface of the transition fillet is smoothly connected to the spiral micro-groove.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: The internal tooth design of this invention, with its gradually varying height along the medium flow direction, adapts to changes in the medium's flow state from inlet to outlet. The lower inner teeth at the inlet reduce initial flow resistance and prevent excessive local pressure drop when the medium velocity is low. As the medium flows further, the gradually increasing inner teeth enhance the disturbance effect on the fluid. Combined with the variable cross-section guiding gaps formed between adjacent inner teeth, this continuously disrupts the laminar boundary layer of the fluid within the pipe, reducing thermal resistance accumulation. The spiral micro-grooves on the surface of the inner teeth form an angle of 30°-60° with the medium flow direction, and the alternating spiral directions of the grooves on adjacent circumferential inner teeth guide the fluid near the wall to form a spiral flow pattern, promoting radial fluid mixing and accelerating the rate of heat transfer from the wall to the main fluid mass. Simultaneously, the groove structure itself increases the effective heat exchange area of ​​the inner wall, providing more heat exchange contact points for the medium. The transition fillet at the connection between the inner teeth and the inner wall of the profile, along with the smooth transition design of the groove walls, reduces dead zones in fluid flow, lowers local energy loss, and achieves a balance between enhanced heat transfer and flow resistance. In this invention, the outer wall corrugated fin units are continuously distributed axially and spaced circumferentially. Their corrugated shape increases the contact area with air, providing ample carrier for heat transfer from the profile body to the external environment. The airflow gaps between adjacent fin units ensure smooth airflow for cooling. The uniformly distributed micro-protrusions on the fin surface further optimize the convective heat transfer process: the protrusion structure disrupts the air boundary layer on the fin surface, inducing local micro-vortices and improving the sufficiency of heat exchange between the airflow and the fin surface. Especially in low-velocity airflow environments, increasing surface roughness can enhance convective heat transfer efficiency. The size and spacing of the protrusions are designed to both exert a disturbance effect and avoid excessively obstructing airflow. Combined with the macroscopic disturbance effect of the corrugated fins, a synergistic heat dissipation mechanism of "macroscopic guidance - microscopic disturbance" is formed, improving the overall heat dissipation capacity of the fins. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall front structure of this utility model; Figure 2 This is a radial cross-sectional view of the present invention. In the picture: 1. Profile body; 2. Fluid channel; 3. Internal teeth; 4. Spiral microgrooves; 5. Fin unit; 6. Micro protrusions. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] like Figures 1 to 2 As shown, this utility model provides a heat exchange profile with internal teeth and high-corrugated fins, characterized in that it includes a profile body 1, an inner wall double-turbulence structure, and an outer wall high-corrugated fin structure; the profile body 1 has a hollow fluid channel 2 that runs through the axial direction for conveying the heat exchange medium; the inner wall double-turbulence structure is integrally formed on the inner wall of the profile body 1 by an extrusion molding process and extends axially along the fluid channel 2; the inner wall double-turbulence structure includes a plurality of circumferentially uniformly distributed internal teeth 3, the height of which extends from 1 / 1 of the inner diameter of the profile body 1 along the flow direction of the heat exchange medium. The diameter gradually decreases from 0 to 1 / 5, and a variable cross-section flow guide gap is formed between adjacent inner teeth 3. Each inner tooth 3 has a spiral micro-groove 4 on its outer surface. The spiral direction of the spiral micro-groove 4 is at an angle of 30°-60° with the flow direction of the heat exchange medium, and the spiral micro-groove 4 of adjacent inner teeth 3 are arranged alternately in the spiral direction. The outer wall high corrugated fin structure is integrally formed on the outer wall of the profile body 1 by extrusion molding process. It is continuously distributed along the axial direction of the profile body 1 and includes multiple circumferentially spaced wave-shaped fin units 5. The surface of the wave-shaped fin unit 5 is provided with tiny protrusions 6.

[0018] Specifically, the design of the inner teeth 3 with gradually varying heights along the direction of medium flow can adapt to the changes in the flow state of the medium from the inlet to the outlet: the lower inner teeth 3 at the inlet section can reduce the initial flow resistance when the medium flow velocity is low, avoiding excessive local pressure drop; as the medium flows forward, the gradually higher inner teeth 3 gradually enhance the disturbance effect on the fluid, and together with the variable cross-section guiding gap formed between adjacent inner teeth 3, it can continuously disrupt the laminar boundary layer of the fluid in the pipe and reduce the accumulation of thermal resistance. The spiral microgrooves 4 on the surface of the inner teeth 3 form an angle of 30°-60° with the direction of medium flow, and the spiral microgrooves 4 of adjacent inner teeth 3 rotate in alternating directions. This can guide the fluid near the wall to form a spiral flow pattern, promote radial fluid mixing, and accelerate the transfer rate of heat from the wall to the fluid body. At the same time, the spiral microgrooves 4 structure itself increases the effective heat exchange area of ​​the inner wall of the profile body 1, providing more heat exchange contact points for the medium. The transition rounded corners at the connection between the inner teeth 3 and the inner wall of the profile body 1 and the smooth transition design of the groove walls of the spiral microgrooves 4 can reduce the dead zone of fluid flow, reduce local energy loss, and achieve a balance between enhanced heat exchange and flow resistance. The rounded corner design at the top of the inner teeth 3 can also further optimize the fluid flow path and avoid energy waste caused by excessive local turbulence.

[0019] The diameter of the micro-protrusions 6 is 0.5-1mm, the spacing between adjacent micro-protrusions 6 is 2-5mm, and the micro-protrusions 6 are evenly arranged along the corrugated surface of the wavy fin unit 5.

[0020] Specifically, the outer wall corrugated fin units 5 are continuously distributed along the axial direction of the profile body 1 and spaced circumferentially. Their corrugated shape expands the contact area with air, providing a sufficient carrier for heat transfer from the profile body 1 to the external environment. The airflow gaps between adjacent corrugated fin units 5 ensure smooth airflow for cooling. The uniformly arranged micro-protrusions 6 on the surface of the corrugated fin units 5 further optimize the convective heat transfer process: the micro-protrusion structure 6 can disrupt the air boundary layer on the fin surface, induce local micro-vortices, and improve the sufficiency of heat exchange between the airflow and the surface of the corrugated fin units 5. Especially in low-velocity airflow environments, the convective heat transfer efficiency can be enhanced by increasing surface roughness. The size and spacing design of the micro-protrusions 6 can exert a disturbance effect without excessively hindering airflow. Combined with the macroscopic disturbance effect of the corrugated fin units 5, a synergistic heat dissipation mechanism of "macroscopic flow guidance - microscopic disturbance" is formed, improving the overall heat dissipation capacity of the fins.

[0021] In the inner wall double turbulence structure, the cross-section of the inner tooth 3 is an isosceles trapezoid, and the top of the inner tooth 3 is provided with a rounded corner with a radius of 0.1-0.3mm; and the tooth spacing of the inner tooth 3 is 1.5-3 times the maximum height of the inner tooth 3, and the maximum height of the inner tooth 3 is 1 / 5 of the inner diameter of the profile body.

[0022] The spiral microgroove 4 has a groove width of 0.2-0.5 mm and a groove depth of 0.1-0.2 mm, and the groove wall of the spiral microgroove 4 smoothly transitions with the outer surface of the inner tooth 3.

[0023] The profile body 1, the inner wall double turbulence structure and the outer wall high corrugated fin structure are integrally manufactured by a one-time extrusion molding process, without the need for subsequent assembly processes.

[0024] In the outer wall high corrugated fin structure, the corrugation height of the corrugated fin unit 5 is 5-15mm, the corrugation spacing is 8-20mm, and the fin thickness is 0.3-1mm; an air flow gap is formed between two adjacent corrugated fin units 5 in the circumferential direction, and the width of the air flow gap is 3-8mm.

[0025] The cross-sectional shape of the profile body 1 is circular, elliptical or regular polygonal; when the cross-section is a regular polygonal, it has 4-8 sides, and each side is provided with at least one wavy fin unit 5.

[0026] Specifically, if aluminum is used, the profile body 1 is made of 6063 aluminum alloy or 3003 aluminum alloy, which has good thermal conductivity and formability; if copper is used, the profile body 1 is made of T2 copper or H62 brass, with a thermal conductivity ≥350W / (m²). K), suitable for heat exchange scenarios with higher requirements for thermal conductivity.

[0027] The connection between the inner tooth 3 and the inner wall of the profile body 1 is provided with a transition fillet. The radius of the transition fillet is 1 / 3 to 1 / 2 of the minimum height of the inner tooth 3. The minimum height of the inner tooth 3 is 1 / 10 of the inner diameter of the profile body. The surface of the transition fillet is smoothly connected to the spiral micro-groove 4.

[0028] Specifically, the inner wall double-turbulence structure, the outer wall high-corrugated fin structure, and the profile body 1 are manufactured through a one-time extrusion molding process, avoiding the interfacial thermal resistance that may occur during separate assembly. This allows the heat of the medium in the fluid channel 2 to be smoothly transferred to the surface of the corrugated fin unit 5 through the profile body 1, reducing heat loss during the heat transfer process. The transition rounded corners at the connection between the inner teeth 3 and the inner wall of the profile body 1, the smooth transition features of the spiral micro-grooves 4, and the structural morphology of the corrugated fin unit 5 are all well-suited to the extrusion molding process, enabling mass production while ensuring structural accuracy. Furthermore, the structural integrity after molding helps improve the long-term stability of the profile and reduces the degradation of heat exchange performance caused by structural splicing or processing defects. At the same time, the elimination of subsequent assembly processes simplifies the production process and reduces the risk of structural compatibility being affected by assembly errors.

[0029] Specifically, this embodiment provides an aluminum profile for a household air conditioner condenser, with the following specific structure: Profile body 1: Made of 6063 aluminum alloy extrusion molding, with a circular cross-section, an outer diameter of 12mm, an inner diameter of 8mm, and a length of 2000mm set according to the requirements of the air conditioner condenser coil.

[0030] Internal teeth 3 structure: integrally formed on the inner wall of the profile body 1, with 8 internal teeth evenly distributed; the cross-section of the internal teeth 3 is triangular, with a height of 1mm (i.e. 1 / 8 of the inner diameter of the profile body 1), and the tooth spacing is 2mm (i.e. 2 times the height of the internal teeth 3); the top of the internal teeth 3 is rounded with a radius of 0.2mm.

[0031] High-corrugated fin structure: integrally formed on the outer wall of the profile body 1, with 10 fin units evenly distributed around the circumference of the profile body 1; each fin unit 5 is wavy, with a corrugation height of 8mm, a corrugation spacing of 12mm, and a fin thickness of 0.5mm; the airflow gap between adjacent fin units 5 is 5mm; the surface of the fin unit 5 is provided with tiny protrusions 6 with a diameter of 0.8mm and a spacing of 3mm.

[0032] This aluminum profile is manufactured in one piece through an extrusion molding process, requiring no further processing. When used in a household air conditioner condenser, refrigerant (such as R32) flows inside the pipe. The internal tooth structure 3 disturbs the refrigerant flow, disrupting the laminar boundary layer and improving the heat exchange efficiency inside the pipe. Outside the pipe, a fan drives airflow, and the high-corrugated fin structure expands the heat dissipation area. At the same time, the tiny protrusions 6 on the fin surface further enhance air disturbance and accelerate heat dissipation. Tests show that the heat exchange efficiency of this aluminum profile is 45% higher than that of the traditional smooth pipe with flat fin structure, and the fins are firmly bonded to the pipe, with no detachment after long-term use.

[0033] Specifically, this embodiment provides a copper profile for an industrial evaporative condenser, with the following specific structure: Profile body 1: Made of T2 copper by extrusion, with an elliptical cross-section, a major axis outer diameter of 20mm, a minor axis outer diameter of 15mm, a major axis inner diameter of 16mm, a minor axis inner diameter of 11mm, and a length of 4000mm based on the tube bundle requirements of the evaporative condenser.

[0034] Internal tooth structure: integrally formed on the inner wall of the profile body 1, there are 12 internal teeth 3, which are evenly distributed along the elliptical inner wall; the cross-section of the internal teeth 3 is trapezoidal, the upper base width is 0.8mm, the lower base width is 1.5mm, the height is 1.5mm (that is, about 1 / 7 of the average inner diameter of the profile body 1), the tooth spacing is 3mm (that is, twice the height of the internal teeth 3); the radius of the rounded corner at the top of the internal teeth 3 is 0.3mm.

[0035] High-corrugated fin structure: integrally formed on the outer wall of the profile body 1, with 16 fin units 5 evenly distributed around the circumference of the profile body 1; each fin unit 5 is wavy, with a corrugation height of 12mm, a corrugation spacing of 18mm, and a fin thickness of 0.8mm; the air flow gap between adjacent fin units 5 is 6mm; no micro-protrusions 6 are provided on the surface of the fin unit 5 (because the evaporative condenser uses spray water cooling, protrusions are prone to scale buildup, affecting heat exchange).

[0036] This copper profile is integrally manufactured through an extrusion molding process, and its surface is nickel-plated to improve corrosion resistance. When used in industrial evaporative condensers, high-temperature process fluids (such as ethylene glycol solutions) flow inside the tube. The internal toothed structure disturbs the fluid flow, improving the heat exchange efficiency inside the tube. Cooling water is sprayed outside the tube through a spray system. The high-corrugated fin structure increases the contact area with the cooling water, while air flows through the gaps between the fins, accelerating the evaporation and heat dissipation of the cooling water. Tests show that the heat exchange efficiency of this copper profile is 55% higher than that of traditional copper tubes with welded fins, and the integral molding structure avoids the problem of corrosion and leakage at the weld joints, extending its service life to more than 5 years.

[0037] The working principle and usage process of this utility model are as follows: After the heat exchange medium is transported to the fluid channel 2 of the profile body 1, it flows along the axial direction of the channel. During the flow, the gradually changing height of the inner teeth 3 on the inner wall adapts to the changes in the medium flow velocity. The low inner teeth 3 at the inlet section reduce the initial resistance, and the subsequent gradually increasing inner teeth 3, together with the variable cross-section guide gap, disrupt the laminar boundary layer. The spiral micro-grooves 4 on the surface of the inner teeth 3 (at an angle of 30°-60° with the medium flow direction, with alternating circumferential and spiral directions) guide the fluid to form a spiral flow, promoting radial heat exchange. At the same time, the heat of the medium is transferred through the profile body 1 to the outer wall corrugated fin unit 5. The tiny protrusions 6 on the fin surface disrupt the air boundary layer and induce micro-vortices. The cooling airflow passes smoothly through the gaps between adjacent fin units, and the heat is quickly carried away, ultimately completing a highly efficient heat exchange cycle.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heat exchange profile with internal teeth and high-corrugated fins, characterized in that, The system includes a profile body (1), an inner wall double-turbulence structure, and an outer wall high-corrugated fin structure. The profile body (1) has an axially penetrating hollow fluid channel (2) for transporting heat exchange medium. The inner wall double-turbulence structure is integrally formed on the inner wall of the profile body (1) by extrusion molding and extends axially along the fluid channel (2). The inner wall double-turbulence structure includes multiple circumferentially evenly distributed inner teeth (3). The height of the inner teeth (3) gradually changes from 1 / 10 to 1 / 5 of the inner diameter of the profile body (1) along the flow direction of the heat exchange medium, and a variable distance is formed between adjacent inner teeth (3). The cross-sectional flow guide gap, each inner tooth (3) has a spiral micro groove (4) on its outer surface. The spiral direction of the spiral micro groove (4) is at an angle of 30°-60° with the flow direction of the heat exchange medium, and the spiral micro grooves (4) of adjacent inner teeth (3) are arranged alternately in the spiral direction. The outer wall high corrugated fin structure is integrally formed on the outer wall of the profile body (1) by extrusion molding process, and is continuously distributed along the axial direction of the profile body (1). It includes multiple circumferentially spaced wave-shaped fin units (5). The surface of the wave-shaped fin unit (5) is provided with tiny protrusions (6).

2. The heat exchange profile with internal teeth and high-corrugated fins according to claim 1, characterized in that, The diameter of the micro-protrusions (6) is 0.5-1mm, the spacing between adjacent micro-protrusions (6) is 2-5mm, and the micro-protrusions (6) are evenly arranged along the corrugated surface of the wavy fin unit (5).

3. The heat exchange profile with internal teeth and high-corrugated fins according to claim 1, characterized in that, In the inner wall double turbulence structure, the cross-section of the inner tooth (3) is an isosceles trapezoid, and the top of the inner tooth (3) is provided with a rounded corner with a radius of 0.1-0.3mm; and the tooth spacing of the inner tooth (3) is 1.5-3 times the maximum height of the inner tooth (3), and the maximum height of the inner tooth (3) is 1 / 5 of the inner diameter of the profile body.

4. The heat exchange profile with internal teeth and high-corrugated fins according to claim 1, characterized in that, The spiral microgroove (4) has a groove width of 0.2-0.5 mm and a groove depth of 0.1-0.2 mm, and the groove wall of the spiral microgroove (4) smoothly transitions with the outer surface of the inner tooth (3).

5. A heat exchange profile with internal teeth and high-corrugated fins according to claim 1, characterized in that, The profile body (1), the inner wall double turbulence structure and the outer wall high corrugated fin structure are integrally manufactured by a one-time extrusion molding process, without the need for subsequent assembly processes.

6. A heat exchange profile with internal teeth and high-corrugated fins according to claim 1, characterized in that, In the outer wall high corrugated fin structure, the corrugation height of the corrugated fin unit (5) is 5-15mm, the corrugation spacing is 8-20mm, and the fin thickness is 0.3-1mm; an air flow gap is formed between two adjacent corrugated fin units (5) in the circumferential direction, and the width of the air flow gap is 3-8mm.

7. A heat exchange profile with internal teeth and high-corrugated fins according to claim 1, characterized in that, The cross-sectional shape of the profile body (1) is circular, elliptical or regular polygonal; when the cross-section is a regular polygonal, it has 4-8 sides, and each side is provided with at least one wavy fin unit (5).

8. A heat exchange profile with internal teeth and high-corrugated fins according to claim 1, characterized in that, The connection between the inner tooth (3) and the inner wall of the profile body (1) is provided with a transition fillet. The radius of the transition fillet is 1 / 3 to 1 / 2 of the minimum height of the inner tooth (3). The minimum height of the inner tooth (3) is 1 / 10 of the inner diameter of the profile body. The surface of the transition fillet is smoothly connected to the spiral micro-groove (4).

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