Micro-structure high-fin heat exchange tube

Abstract

The utility model relates to the technical field of heat exchange parts, in particular to a micro-structure high-fin heat exchange tube, which increases the heat exchange area and improves the heat exchange effect at the same time. The outer fins are formed by extending materials on the pipe body in the radius direction of the pipe body and spirally extending on the outer surface of the pipe body around the pipe body, the outer fins and the pipe are integrally formed, the upper portions of the outer fins are narrow, the lower portions of the outer fins are wide, and inter-fin channels are formed between the adjacent outer fins; at least one side groove channel is formed in the two sides of each outer fin, the extending direction of the side groove channels is consistent with the extending direction of the outer fins, and the side groove channels in the two sides of each outer fin are arranged in a staggered mode. And through fin geometric parameter refinement and manufacturing process precision, the heat exchange efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to the technical field of heat exchange components, specifically to a microstructure high-fin heat exchange tube. Background Technology

[0002] Copper and copper alloy high-finned tubes are mainly used in gas-to-gas, gas-to-liquid, and liquid-to-liquid heat exchange applications, and are a high-performance, energy-saving product. The application focus of copper and copper alloy high-finned tubes has shifted from aerospace and military industries to petroleum, chemical, HVAC, power, and marine engineering industries, expanding from industrial applications to civilian products. The sophistication of the high-finned tubes directly affects the operating performance of equipment and devices, and plays a crucial role in energy conservation.

[0003] Currently, developed countries are focusing their research and development on finned tube products towards higher fin heights, thinner fins, higher density, and different fin shapes. These structures are beneficial for increasing the heat exchange area and improving heat exchange efficiency, achieving high efficiency and energy saving. Changing the shape of the outer fins of high-fin heat exchange tubes is one effective way to increase the heat exchange area, aligning the fin arrangement direction with the heat source propagation direction, thereby improving heat exchange performance while achieving material saving, energy saving, and environmental protection.

[0004] Currently, copper and copper alloy high-finned tubes are widely used in hot water boilers. Using high-finned tubes as heat exchange elements improves the boiler's heat exchange efficiency, making it an energy-saving and environmentally friendly product. Within a given space, the most direct and effective way to improve the boiler's heat exchange effect is to increase the number of outer fins per unit length of the high-finned heat exchange tube or to increase the height of the outer fins, thereby increasing the heat exchange area and enhancing the heat exchange effect. Utility Model Content

[0005] The purpose of this invention is to provide a microstructured high-fin heat exchange tube that increases the heat exchange area while improving the heat exchange effect.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] This utility model provides a microstructure high-fin heat exchange tube, including a tube body and outer fins integrally formed with the tube body. The outer fins are formed by extending material from the tube body along the radial direction of the tube body and spirally extending around the tube body on the outer surface of the tube body. The outer fins are narrower at the top and wider at the bottom, and interfin channels are formed between adjacent outer fins. At least one side channel is opened on both sides of the outer fins. The extension direction of the side channel is consistent with the spiral extension direction of the outer fins, and the side channels on both sides of the outer fins are staggered.

[0008] Furthermore, the width of the outer fin is 0.4~1.0mm, and the height of the outer fin is 5~15mm.

[0009] Furthermore, the outer fins are arranged at a density of 3-4 teeth / cm along the axial direction of the tube.

[0010] Furthermore, the helix angle of the outer fin is 80~89°.

[0011] Furthermore, the width of the interfinal channel is 1.5~2.9mm.

[0012] Furthermore, the depth of the side channel is 0.1~0.2mm, and the width of the side channel is 1~3mm.

[0013] Furthermore, the cross-sectional shape of the side channel is rectangular, V-shaped, or U-shaped.

[0014] Furthermore, the spacing between the side channels is 2~5mm.

[0015] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0016] This invention discloses a microstructure high-fin heat exchange tube, in which the outer fins are integrally formed with the tube body, eliminating the contact thermal resistance between the two. Furthermore, the outer fins are narrower at the top and wider at the bottom, reducing the thickness of conventional outer fins and increasing the external heat exchange area, thereby improving heat exchange efficiency. At least one side channel is provided on both sides of the outer fins, which enhances airflow turbulence, further improving heat exchange efficiency and saving energy. Simultaneously, the side channel design reduces the weight of the heat exchange tube, saving copper material.

[0017] Furthermore, the side channels on both sides of the outer fins are staggered and not at the same height to prevent the side channel structure from affecting the fin strength and to ensure the service life of the heat exchange tube. Attached Figure Description

[0018] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0019] Figure 1 This is a three-dimensional structural diagram of a microstructure high-fin heat exchange tube provided by this utility model;

[0020] Figure 2 This is a cross-sectional view of a microstructured high-fin heat exchange tube provided by this utility model;

[0021] Figure 3 This is an enlarged schematic diagram (I) of the cross-sectional structure of the outer fins provided by this utility model;

[0022] Figure 4This is a magnified schematic diagram (II) of the cross-sectional structure of the outer fins provided by this utility model;

[0023] Figure 5 This is an enlarged schematic diagram (III) of the cross-sectional structure of the outer fins provided by this utility model;

[0024] The reference numerals in the attached figures are explained as follows:

[0025] 1. Tube body; 2. Outer fins; 20. Side channels; 3. Inter-fin channels. Detailed Implementation

[0026] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] like Figure 1 The diagram shown is a three-dimensional structural schematic of a microstructured high-fin heat exchange tube, representing a portion of the heat exchange tube. It includes a tube body 1 and outer fins 2 integrally formed with the tube body 1.

[0028] Specifically, see Figures 1 to 5 The outer fins 2 extend radially along the tube body 1 and spirally extend around the tube body on its outer surface. The outer fins 2 are integrally rolled from the material on the tube body 1. This integral molding eliminates the contact thermal resistance between the outer fins 2 and the tube body 1, thereby reducing heat transfer loss between them.

[0029] In this embodiment, compared to the fins in the prior art, the thickness of the outer fin 2 is reduced, resulting in an overall shape that is narrower at the top and wider at the bottom, with the width controlled within the range of 0.4~1.0 mm. Furthermore, the height of the outer fin 2 is extended, controlled within the range of 5~15 mm. The arrangement density of the outer fin 2 along the axial direction of the tube body 1 is controlled at 3~4 threads / cm, or 8~10 threads per inch. Therefore, by reducing the thickness of the outer fin 2, increasing its height, and increasing its arrangement density, the heat exchange area outside the tube is increased, thereby improving heat exchange efficiency.

[0030] In this embodiment, the helix angle of the outer fin 2 is controlled within 80~89°, where the helix angle refers to the angle between the helical extension direction of the outer fin 2 and the axis of the tube body 1. This angle range optimizes the balance between fluid disturbance and flow resistance, prolongs the fluid helical path, increases the contact time between the fluid and the fins, enhances the turbulence effect, improves heat exchange efficiency, and ensures structural strength.

[0031] Interfinal channels 3 are formed between adjacent outer fins 2, and the width of the interfinal channels 3 is set according to the outer fins 2. In this embodiment, the width of the interfinal channels 3 is controlled between 1.5 and 2.9 mm, which enhances capillary action, promotes uniform distribution of liquid working fluid (such as refrigerant), improves the disturbance intensity of gas-liquid two-phase flow, and achieves the best boundary layer disruption effect.

[0032] At least one side channel 20 is provided on both sides of the outer fin 2, and the extension direction of the side channel 20 is consistent with the extension direction of the outer fin 2. The side channel 20 is designed to enhance airflow turbulence, further improve heat exchange efficiency, and save energy; at the same time, it can reduce the weight of the heat exchange tube and save copper material. Moreover, the side channels 20 located on both sides of the outer fin 2 are staggered, that is, the side channels 20 on both sides of the outer fin 2 are staggered and not at the same height position. The purpose is to prevent the channel structure from affecting the strength of the fin and to ensure the service life of the heat exchange tube.

[0033] In this embodiment, the depth of the side channel 20 is controlled at 0.1~0.2mm, and the width is controlled at 1~3mm. The advantage of the 0.1~0.2mm depth microstructure is that it can form a stable boundary layer separation point, causing the mainstream fluid and the wall fluid to alternate periodically, thus increasing the turbulence intensity. The width control of 1~3cm, in conjunction with the 0.1~0.2mm depth, promotes the uniform spreading of the liquid working fluid in the channel, seeking the optimal balance between heat transfer performance and flow resistance. The setting of the side channel 20 facilitates the formation of a gradual flow channel contraction, which increases the fluid velocity gradient, thereby generating directional vortices, enhancing near-wall disturbance, and reducing the flow stagnation zone.

[0034] See Figures 3 to 5 The cross-sectional shape of the aforementioned side channel 20 can be rectangular, V-shaped, or U-shaped, and the specific shape can be adjusted according to actual needs.

[0035] The spacing between the side channels 20 can be reasonably arranged as needed. In this embodiment, the spacing is controlled at 2~5mm.

[0036] In summary, the microstructured high-fin heat exchange tube in this example features an outer fin 2 integrally formed with the tube body 1, eliminating contact thermal resistance and enhancing heat transfer efficiency. The outer fin 2 is narrower at the top and wider at the bottom, and is thinner than conventional outer fins. Furthermore, by increasing the height and density of the outer fin 2, the external heat exchange area is increased, thereby improving heat exchange efficiency. The spiral high fins (10-15mm height) combined with a dense arrangement (3-4 teeth / cm) increase the heat exchange area per unit length by 40%-60%, far exceeding traditional straight-fin designs.

[0037] In addition, the side channels 20 opened on both sides of the outer fin 2 can enhance the turbulence of the airflow, form a secondary heat exchange unit on the fin surface, expand the effective heat exchange surface, further improve the heat exchange efficiency, and save energy. At the same time, the setting of the side channels 20 can reduce the weight of the heat exchange tube and save copper material.

[0038] The spiral angle (80~89°) works in synergy with the side channel to generate three-dimensional vortices, which disrupt the thermal boundary layer and increase the measured turbulence intensity.

[0039] Furthermore, the side channels 20 on both sides of the outer fin 2 are staggered and not at the same height position to prevent the structure of the side channels 20 from affecting the strength of the fins and to ensure the service life of the heat exchange tube; at the same time, it can also complicate the fluid path and extend the contact time.

[0040] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. A microstructure high-fin heat exchange tube, comprising a tube body (1) and external fins (2) integrally formed with the tube body (1) by means of material on the tube body (1) extending along the radial direction of the tube body (1) and spirally extending around the tube body (1) on the outer surface of the tube body (1), characterized in that, The outer fin (2) is narrower at the top and wider at the bottom, and an inter-fin channel (3) is formed between adjacent outer fins (2); at least one side channel (20) is provided on both sides of the outer fin (2), and the extension direction of the side channel (20) is consistent with the spiral extension direction of the outer fin (2), and the side channels (20) on both sides of the outer fin (2) are staggered.

2. The microstructure high-fin heat exchange tube according to claim 1, characterized in that, The width of the outer fin (2) is 0.4~1.0mm, and the height of the outer fin (2) is 5~15mm.

3. A microstructured high-fin heat exchange tube according to claim 2, characterized in that, The outer fins (2) are arranged at a density of 3~4 teeth / cm along the axial direction of the tube body (1).

4. A microstructured high-fin heat exchange tube according to claim 2, characterized in that, The spiral angle of the outer fin (2) is 80~89°.

5. A microstructured high-fin heat exchange tube according to claim 1, characterized in that, The width of the interfinal channel (3) is 1.5~2.9mm.

6. A microstructured high-fin heat exchange tube according to claim 1, characterized in that, The depth of the side channel (20) is 0.1~0.2mm, and the width of the side channel (20) is 1~3mm.

7. A microstructured high-fin heat exchange tube according to claim 6, characterized in that, The cross-sectional shape of the side channel (20) is rectangular, V-shaped or U-shaped.

8. A microstructured high-fin heat exchange tube according to claim 6, characterized in that, The spacing between the side channels (20) is 2~5mm.

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