Finned tube heat exchanger and heat exchange fin

Abstract

The application provides a finned tube heat exchanger and a heat exchange fin. The heat exchange fin has a preset airflow flow direction. The heat exchange fin comprises a fin body, the fin body having a first heat exchange surface; a plurality of heat exchange tube holes penetrating through the fin body are arranged on the fin body; the heat exchange tube hole has a first center line perpendicular to the airflow flow direction and the axial direction of the heat exchange tube hole; and a plurality of vortex generators are arranged on the first heat exchange surface to guide the airflow on the windward side of the heat exchange tube hole to the leeward side of the heat exchange tube hole; the vortex generator comprises a first guide structure and a second guide structure arranged on the two sides of the corresponding heat exchange tube hole respectively; the starting guide position of the first guide structure is located on the first center line of the corresponding heat exchange tube hole; and the starting guide position of the second guide structure is located on the first center line of the corresponding heat exchange tube hole. The vortex generator effectively promotes the heat exchange between the airflow and the structure on the leeward side of the heat exchange tube, and significantly improves the overall heat exchange efficiency.

Description

Technical Field

[0001] This application relates to the field of heat exchangers, specifically to a finned tube heat exchanger and heat exchange fins. Background Technology

[0002] In modern industrial production, finned tube heat exchangers, as heat exchange devices, are widely used in heating, refrigeration, thermal power generation, chemical industry, metallurgy, and other fields due to their advantages such as high heat transfer coefficient, convenient medium heat exchange, simple production, and easy installation. With industry development, the requirements for the heat exchange efficiency of finned tube heat exchangers are also increasing. The heat exchange efficiency of finned tube heat exchangers directly affects the overall performance of the equipment; therefore, improving the heat exchange efficiency of finned tube heat exchangers has always been an important research direction in this technical field. Summary of the Invention

[0003] This application provides a finned tube heat exchanger and heat exchange fins that can improve heat exchange efficiency through multiple embodiments.

[0004] On one hand, this application provides a heat exchange fin, the heat exchange fin having a preset airflow direction; the heat exchange fin includes:

[0005] A fin body, the fin body having a first heat exchange surface; the fin body having a plurality of heat exchange tube holes penetrating the fin body; the heat exchange tube holes having a first center line perpendicular to both the airflow direction and the axial direction of the heat exchange tube holes; and

[0006] A plurality of vortex generators are disposed on the first heat exchange surface to guide the airflow from the windward side of the heat exchange tube hole to the leeward side of the heat exchange tube hole; the vortex generator includes a first guide structure and a second guide structure respectively disposed on both sides of the heat exchange tube hole; the initial guide position of the first guide structure is located on the first center line corresponding to the heat exchange tube hole; the initial guide position of the second guide structure is located on the first center line corresponding to the heat exchange tube hole.

[0007] In some embodiments, the distance between the initial guiding position of the first guiding structure and the heat exchange tube hole satisfies the following condition:

[0008] 0.15 < L1 / (0.5*Wd) < 0.6;

[0009] Wherein, L1 is the distance between the starting guide position of the first guide structure and the heat exchange tube hole; W is the distance between adjacent heat exchange tube holes arranged along the direction of the first center line; and d is half the size of the heat exchange tube hole along the direction of the first center line.

[0010] And / or, the distance between the initial guiding position of the second guiding structure and the heat exchange tube hole satisfies the following condition:

[0011] 0.15 < L2 / (0.5*Wd) < 0.6;

[0012] Wherein, L2 is the distance between the starting guide position of the second guide structure and the heat exchange tube hole; W is the distance between the heat exchange tube holes arranged adjacent to each other along the direction of the first center line; and d is half the size of the heat exchange tube hole along the direction of the first center line.

[0013] In some embodiments, the first guide structure has a first guide plane; the guiding extension direction of the first guide plane is inclined toward one side of the heat exchange tube hole;

[0014] The second guide structure has a second guide plane; the guiding extension direction of the second guide plane is inclined toward one side of the heat exchange tube hole.

[0015] In some embodiments, the starting end of the first guide plane is located on the first center line;

[0016] And / or, the starting end of the second guide plane is located on the first center line.

[0017] In some embodiments, the end of the first guide plane is located on the leeward side of the corresponding heat exchange tube hole;

[0018] And / or, the end of the second guide plane is located on the leeward side of the corresponding heat exchange tube hole.

[0019] In some embodiments, the angle between the guiding extension direction of the first guide plane and the airflow direction is in the range of 25° to 60°.

[0020] And / or, the angle between the guiding extension direction of the second guide plane and the airflow direction is in the range of 25° to 60°.

[0021] In some embodiments, the top end of the first guide plane is inclined away from the side corresponding to the heat exchange tube hole, and the angle between the first guide plane and the axial direction of the corresponding heat exchange tube hole is in the range of 25° to 45°.

[0022] And / or, the top of the second guide plane is inclined away from the side corresponding to the heat exchange tube hole, and the angle between the second guide plane and the axial direction of the corresponding heat exchange tube hole is in the range of 25° to 45°.

[0023] In some embodiments, the guide surface of the first guide structure is a first guide surface; the guide surface of the second guide structure is a second guide surface;

[0024] The tail end of the first guide surface bends toward the leeward side, close to the corresponding heat exchange tube hole;

[0025] The tail end of the second guide surface bends toward the leeward side, close to the corresponding heat exchange tube hole.

[0026] In some embodiments, the guide surface of the first guide structure is a first guide surface; the guide surface of the second guide structure is a second guide surface;

[0027] The first guide surface has a first starting transition section at its starting end; along the guide direction, the height of the first starting transition section gradually increases from the starting end.

[0028] And / or, the starting end of the second guide surface is provided with a second starting transition section; along the guide direction, the height of the second starting transition section gradually increases from the starting end;

[0029] And / or, the tail end of the first guide surface is provided with a first tail transition section; along the guide direction, the height of the first tail transition section gradually decreases from the starting end;

[0030] And / or, the tail end of the second guide surface is provided with a second tail transition section; along the guide direction, the height of the second tail transition section gradually decreases from the starting end.

[0031] In some embodiments, the first guide structure has a first guide surface;

[0032] And / or, the second guide structure has a second guide surface.

[0033] In some embodiments, the starting end of the first guide surface is located on the first center line;

[0034] And / or, the starting end of the second guide surface is located on the first center line.

[0035] In some embodiments, the first guide surface is arc-shaped;

[0036] And / or, the second guide surface is arc-shaped.

[0037] In some embodiments, the vortex generator further includes a third guide structure and a fourth guide structure; the third guide structure is disposed on the side of the first guide structure away from the heat exchange tube hole; the fourth guide structure is disposed on the side of the second guide structure away from the heat exchange tube hole.

[0038] In some embodiments, the starting guide position of the third guide structure is located on the first center line; the starting guide position of the fourth guide structure is located on the first center line.

[0039] On the other hand, this application also provides a finned tube heat exchanger, which includes heat exchange tubes and heat exchange fins provided in this application; the heat exchange tubes are inserted into the heat exchange tube holes of the heat exchange fins.

[0040] In some embodiments, the finned tube heat exchanger includes a plurality of heat exchange fins stacked together;

[0041] In the direction perpendicular to the heat exchange fins, the ratio of the height of the first guide structure to the spacing of the heat exchange fins falls within the range of 0.2 to 0.8.

[0042] In the direction perpendicular to the heat exchange fins, the ratio of the height of the first guide structure to the spacing of the heat exchange fins falls within the range of 0.2 to 0.8.

[0043] In the various embodiments provided in this application, the finned tube heat exchanger using the heat exchange fins provided in this application effectively guides the airflow to the leeward side of the heat exchange tube using the first and second guiding structures of the vortex generator. This reduces the flow stagnation area on the leeward side of the heat exchange tube, increases the turbulence of the airflow, promotes heat exchange between the airflow and the structure on the leeward side of the heat exchange tube, and significantly improves the overall heat exchange efficiency of the finned tube heat exchanger. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the structure of a heat exchange fin provided in one embodiment of this application.

[0045] Figure 2 for Figure 1 A partial structural diagram of the heat exchange fins.

[0046] Figure 3 for Figure 1 Axonometric view of the heat exchange fins.

[0047] Figure 4 for Figure 1 A cross-sectional view of the heat exchange fins along the MM direction.

[0048] Figure 5 for Figure 1 A cross-sectional view of the heat exchange fins along the NN direction.

[0049] Figure 6 This is a schematic diagram of the structure of a heat exchange fin provided for another embodiment of this application.

[0050] Figure 7 This is a schematic diagram of the structure of a heat exchange fin provided for another embodiment of this application.

[0051] Figure 8 This is a schematic diagram of the structure of a heat exchange fin provided for another embodiment of this application.

[0052] Figure 9 This is a schematic diagram of the structure of a heat exchange fin provided for another embodiment of this application.

[0053] Figure 10 The graphs show the Nusselt number Nu as a function of the Reynolds number Re for Examples 1-5, Comparative Example 1, and Comparative Example 2.

[0054] Explanation of reference numerals in the attached figures

[0055] 100 / 200 / 300 / 400 / 500, Heat exchange fins; 110, Fin body; 111, First heat exchange surface; 112, Heat exchange tube hole; b, First centerline; 120, Vortex generator; 121, First guide structure; 1211, First guide plane; 1212, First guide surface; 1213, First initial transition section; 1214, First tail transition section; 1215, First guide curved surface; 122, Second guide structure; 1221, Second guide plane; 1222, Second guide surface; 1223, Second initial transition section; 1224, Second tail transition section; 1225, Second guide curved surface; 123, Third guide structure; 124, Fourth guide structure; a, Airflow direction. Detailed Implementation

[0056] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0057] In this application, the accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features.

[0058] Unless otherwise stated, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items. The singular forms "a," "the," and "the" as used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0059] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0060] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In other words, they should not be construed as limitations on this application.

[0061] In the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "linking," "fixing," "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0062] In the description of this application, unless otherwise expressly defined, the terms "above," "over," "on top of," "below," "below," "under," or "below" for "first feature over second feature" can refer to the first and second features being in direct contact, or to the first and second features being in indirect contact through an intermediate medium. Furthermore, "above," "below," and "over" for "first feature over second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature over second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0063] Researchers discovered that in finned tube heat exchangers, the airflow cannot reach the leeward side of the heat exchange tubes due to the obstruction of the heat exchange tubes, which makes it difficult for the leeward side of the heat exchange tubes to exchange heat with the airflow, resulting in low heat exchange efficiency of the finned tube heat exchanger.

[0064] Based on this, researchers proposed a heat exchange fin with a preset airflow direction. The heat exchange fin includes a fin body and several vortex generators. The fin body has a first heat exchange surface; the fin body has several heat exchange tube holes penetrating the fin body; the heat exchange tube holes have a first center line perpendicular to both the airflow direction and the axial direction of the heat exchange tube holes; several vortex generators are disposed on the first heat exchange surface to guide the airflow from the windward side of the heat exchange tube holes to the leeward side of the heat exchange tube holes; the vortex generators include a first guide structure and a second guide structure respectively disposed on both sides of the corresponding heat exchange tube holes; the initial guiding position of the first guide structure is located on the first center line of the corresponding heat exchange tube hole; the initial guiding position of the second guide structure is located on the first center line of the corresponding heat exchange tube hole.

[0065] In the finned tube heat exchanger using the above-mentioned heat exchange fins, the first and second guiding structures of the vortex generator effectively guide the airflow to the leeward side of the heat exchange tube, reducing the flow stagnation area on the leeward side of the heat exchange tube, increasing the turbulence of the airflow, promoting heat exchange between the airflow and the structure on the leeward side of the heat exchange tube, and significantly improving the overall heat exchange efficiency of the finned tube heat exchanger.

[0066] See Figures 1 to 5 The heat exchange fin 100 provided in one embodiment of this application has a preset airflow direction a. The heat exchange fin includes a fin body 110 and a plurality of vortex generators 120. The fin body 110 has a first heat exchange surface 111; the fin body 110 is provided with a plurality of heat exchange tube holes 112 penetrating the fin body 110; the heat exchange tube holes 112 have a first center line b that is perpendicular to both the airflow direction a and the axial direction of the heat exchange tube holes 112. Several vortex generators 120 are disposed on the first heat exchange surface 111 to guide the airflow on the windward side of the heat exchange tube hole 112 to the leeward side of the heat exchange tube hole 112. The vortex generator 120 includes a first guide structure 121 and a second guide structure 122 respectively disposed on both sides of the corresponding heat exchange tube hole 112. The initial guiding position of the first guide structure 121 is located on the first center line b of the corresponding heat exchange tube hole 112. The initial guiding position of the second guide structure 122 is located on the first center line b of the corresponding heat exchange tube hole 112.

[0067] It is understood that the side through which the airflow first passes is the windward side of the heat exchange tube orifice 112, and the side opposite to the windward side is the leeward side. The windward side of the heat exchange tube orifice 112 is the windward side of the heat exchange tube, and the leeward side of the heat exchange tube orifice 112 is the leeward side of the heat exchange tube. Specifically, in this embodiment, see... Figure 2 The windward side of heat exchange tube hole 112 is Figure 2 The right side of the heat exchanger tube hole 112; the leeward side of the heat exchanger tube hole 112 is... Figure 2 Left side of the heat exchanger tube hole 112.

[0068] Understandably, heat exchanger tube hole 112 is used for the installation of heat exchanger tubes.

[0069] It is understood that each vortex generator 120 corresponds to one heat exchange tube hole 112. Specifically, in this embodiment, each heat exchange tube hole 112 also corresponds to one vortex generator 120.

[0070] In a finned tube heat exchanger employing heat exchange fins 100, the first guide structure 121 and the second guide structure 122 of the vortex generator 120 effectively guide the airflow to the leeward side of the heat exchange tubes, reducing the flow stagnation area on the leeward side of the heat exchange tubes, increasing the turbulence of the airflow, and promoting heat exchange between the airflow and the structure on the leeward side of the heat exchange tubes, thus significantly improving the overall heat exchange efficiency of the finned tube heat exchanger. In other words, the arrangement of the vortex generator 120 changes the flow direction of the airflow velocity field and temperature field, reducing the angle between the velocity and temperature gradients, thereby improving the synergistic effect of temperature, enhancing the overall heat exchange efficiency, and reducing energy consumption.

[0071] Furthermore, after flowing through the leeward side of the heat exchanger tube, the fluid continues to form a rotating vortex flowing in the airflow direction 'a'. The generation of this rotating vortex effectively disturbs the fluid boundary layer of the airflow, reducing its thickness and improving heat exchange efficiency. Moreover, the rotating vortex can also exchange heat with the airflow in the adjacent area to some extent, thereby improving the overall heat exchange efficiency.

[0072] Furthermore, the initial guiding position of the first guiding structure 121 is located on the first centerline b of the corresponding heat exchange tube hole 112; the initial guiding position of the second guiding structure 122 is also located on the first centerline b of the corresponding heat exchange tube hole 112. After the airflow reaches the first centerline b of the corresponding heat exchange tube hole 112, the airflow is guided to flow towards the leeward side of the heat exchange tube hole 112 without needing to reverse the flow direction of the airflow along the first centerline b. This allows for smoother guidance of the airflow to the leeward side of the heat exchange tube hole 112, improving the overall heat exchange efficiency of the finned tube heat exchanger.

[0073] Optionally, the distance between the initial guiding position of the first guiding structure 121 and the heat exchange tube hole 112 satisfies the following condition:

[0074] 0.15 < L1 / (0.5*Wd) < 0.6;

[0075] Wherein, L1 is the distance between the initial guiding position of the first guiding structure 121 and the heat exchange tube hole 112; W is the center distance between adjacent heat exchange tube holes 112 arranged along the direction of the first center line b; and d is half the size of the heat exchange tube hole 112 along the direction of the first center line b.

[0076] The initial guiding position of the first guiding structure 121 and the distance between it and the heat exchange tube hole 112 satisfy the above conditions, which can better control the amount of airflow flowing to the leeward side of the heat exchange tube hole 112, thereby further improving the overall heat exchange efficiency. It is understood that during the airflow process, heat exchange occurs both with the sidewall of the heat exchange tube and with the first heat exchange surface 111. Therefore, appropriately controlling the flow rate of the airflow to the leeward side of the heat exchange tube hole 112 can improve the overall heat exchange efficiency.

[0077] Optionally, the distance between the initial guiding position of the second guiding structure 122 and the heat exchange tube hole 112 satisfies the following condition:

[0078] 0.15 < L2 / (0.5*Wd) < 0.6;

[0079] Wherein, L2 is the distance between the initial guiding position of the second guiding structure 122 and the heat exchange tube hole 112; W is the center distance between adjacent heat exchange tube holes 112 arranged along the direction of the first center line b; and d is half the size of the heat exchange tube hole 112 along the direction of the first center line b.

[0080] The initial guiding position of the second guiding structure 122 and the distance between it and the heat exchange tube hole 112 satisfy the above conditions, which can better control the amount of airflow flowing to the leeward side of the heat exchange tube hole 112, thereby further improving the overall heat exchange efficiency. It is understood that during the airflow process, heat exchange occurs both with the sidewall of the heat exchange tube and with the first heat exchange surface 111. Therefore, appropriately controlling the flow rate of the airflow to the leeward side of the heat exchange tube hole 112 can improve the overall heat exchange efficiency.

[0081] In this specific embodiment, the heat exchange tube hole 112 is cylindrical. Therefore, d is the radius of the heat exchange tube hole 112.

[0082] In this embodiment, the first guide structure 121 has a first guide plane 1211. The guide extension direction of the first guide plane 1211 is inclined towards one side of the heat exchange tube hole 112. The first guide plane 1211 is a plane, which can more smoothly guide the flow direction of the airflow and avoid excessive turbulence during the airflow process. This better guides the airflow between the first guide plane 1211 and the heat exchange tube hole 112 to flow towards the leeward side of the heat exchange tube hole 112. In addition, the guide extension direction of the first guide plane 1211 is inclined towards one side of the heat exchange tube hole 112, which reduces the distance between the first guide plane 1211 and the heat exchange tube hole 112, so that the airflow can flow to the leeward side of the heat exchange tube hole 112 more quickly.

[0083] In this embodiment, the second guide structure 122 has a second guide plane 1221. The guide extension direction of the second guide plane 1221 is inclined towards one side of the heat exchange tube hole 112. The second guide plane 1221 is a plane, which can more smoothly guide the flow direction of the airflow and avoid excessive turbulence during the airflow process, so as to better guide the airflow between the second guide plane 1221 and the heat exchange tube hole 112 to flow towards the leeward side of the heat exchange tube hole 112. In addition, the guide extension direction of the second guide plane 1221 is inclined towards one side of the heat exchange tube hole 112, which reduces the distance between the second guide plane 1221 and the heat exchange tube hole 112, so that the airflow can flow to the leeward side of the heat exchange tube hole 112 more quickly.

[0084] In this embodiment, the starting end of the first guide plane 1211 is located on the first center line b; and the starting end of the second guide plane 1221 is located on the first center line b. It is understood that in some other embodiments, the upstream of the first guide plane also has a guide surface; the upstream of the second guide plane also has a guide surface.

[0085] In this embodiment, the end of the first guide plane 1211 is located on the leeward side of the corresponding heat exchange tube hole 112; the end of the second guide plane 1221 is located on the leeward side of the corresponding heat exchange tube hole 112. This allows for better guidance of airflow to the leeward side of the heat exchange tube hole 112, thereby improving the heat exchange efficiency on the leeward side of the heat exchange tube.

[0086] Optionally, the angle α between the guiding extension direction of the first guide plane 1211 and the airflow direction a falls within the range of 25° to 60°, so as to improve the overall heat exchange efficiency of the finned tube heat exchanger. Specifically, the angle α between the guiding extension direction of the first guide plane 1211 and the airflow direction a can be any value within the range of 25° to 60°, such as 25°, 30°, 35°, 40°, 45°, 50°, 55° or 60°.

[0087] Optionally, the angle β between the guiding extension direction of the second guide plane 1221 and the airflow direction a falls within the range of 25° to 60° to improve the overall heat exchange efficiency of the finned tube heat exchanger. Specifically, the angle β between the guiding extension direction of the second guide plane 1221 and the airflow direction a can be any value within the range of 25° to 60°, such as 25°, 30°, 35°, 40°, 45°, 50°, 55°, or 60°.

[0088] Optionally, the top end of the first guide plane 1211 is inclined away from the corresponding heat exchange tube hole 112, and the included angle γ between the first guide plane 1211 and the axial direction of the corresponding heat exchange tube hole 112 is in the range of 25° to 45°. It can be understood that the axial direction of the heat exchange tube hole 112 is the thickness direction of the fin body 110. This reduces the resistance to airflow, making the airflow smoother. Specifically, the included angle γ between the first guide plane 1211 and the axial direction of the corresponding heat exchange tube hole 112 can be any value within the range of 25° to 45°, such as 25°, 28°, 30°, 32°, 35°, 38°, 40°, 42°, or 45°.

[0089] Optionally, the top end of the second guide plane 1221 is inclined away from the corresponding heat exchange tube hole 112, and the angle δ between the second guide plane 1221 and the axial direction of the corresponding heat exchange tube hole 112 falls within the range of 25° to 45°. It can be understood that the axial direction of the heat exchange tube hole 112 is the thickness direction of the fin body 110. This reduces airflow resistance, making airflow smoother. Specifically, the angle δ between the second guide plane 1221 and the axial direction of the corresponding heat exchange tube hole 112 can be any value within the range of 25° to 45°, such as 25°, 28°, 30°, 32°, 35°, 38°, 40°, 42°, or 45°.

[0090] In this embodiment, the first guide structure 121 has a guide plane, namely the first guide plane 1211; the second guide structure 122 has a guide plane, namely the second guide plane 1221. It is understood that in some other embodiments, the first guide structure may also have multiple continuous or discontinuous guide planes; the second guide structure may also have multiple continuous or discontinuous guide planes.

[0091] In this embodiment, the guiding surface of the first guiding structure 121 is the first guiding surface 1212; the tail end of the first guiding surface 1212 bends toward the leeward side near the corresponding heat exchange tube hole 112 so that the airflow can better exchange heat with the leeward side of the heat exchange tube and improve the overall heat exchange efficiency.

[0092] In this embodiment, the guide surface of the second guide structure 122 is the second guide surface 1222. The tail end of the second guide surface 1222 bends toward the leeward side near the corresponding heat exchange tube hole 112, so that the airflow can better exchange heat with the leeward side of the heat exchange tube and improve the overall heat exchange efficiency.

[0093] In this embodiment, the first guide surface 1212 has a first starting transition section 1213 at its starting end; along the guide direction, the height of the first starting transition section 1213 gradually increases from the starting end, so that the airflow can enter the space between the first guide surface 1212 and the side wall of the heat exchange tube more smoothly.

[0094] In this embodiment, the starting end of the second guide surface 1222 is provided with a second starting transition section 1223; along the guide direction, the height of the second starting transition section 1223 gradually increases from the starting end, so that the airflow can enter the space between the first guide surface 1212 and the side wall of the heat exchange tube more smoothly.

[0095] In this embodiment, the tail end of the first guide surface 1212 is provided with a first tail transition section 1214; along the guide direction, the height of the first tail transition section 1214 gradually decreases from the starting end, so that the airflow on the leeward side of the heat exchange tube can flow out smoothly, thereby reducing the air pressure on the leeward side of the heat exchange tube, promoting the flow of airflow, and improving the overall heat exchange efficiency.

[0096] In this embodiment, the guiding surface of the second guiding structure 122 is the second guiding surface 1222. The tail end of the second guiding surface 1222 is provided with a second tail transition section 1224; along the guiding direction, the height of the second tail transition section 1224 gradually decreases from the starting end, so that the airflow on the leeward side of the heat exchange tube can flow out smoothly, thereby reducing the air pressure on the leeward side of the heat exchange tube, promoting airflow, and improving the overall heat exchange efficiency.

[0097] In this embodiment, the first heat exchange surface 111 of the fin body 110 is double-corrugated, which gives the first heat exchange surface 111 a larger heat exchange area and improves heat exchange efficiency. Furthermore, it also reduces airflow resistance. It is understood that in other embodiments, the first heat exchange surface may also be planar or other regular or irregular curved surfaces.

[0098] See Figure 4 and Figure 5 In this embodiment, the cross-section of the first guide structure 121 perpendicular to the guide direction is approximately an isosceles triangle, and the bottom surface of the first guide structure 121 is fixedly connected to the first heat exchange surface 111 of the fin body 110, making the connection more stable. Similarly, the cross-section of the second guide structure 122 perpendicular to the guide direction is also approximately an isosceles triangle, and the bottom surface of the second guide structure 122 is fixedly connected to the first heat exchange surface 111 of the fin body 110, making the connection more stable.

[0099] Furthermore, in this embodiment, the tops of both the first guide structure 121 and the second guide structure 122 are rounded to reduce the turbulence of airflow at the tops of the first guide structure 121 and the second guide structure 122.

[0100] It is understood that, in some other embodiments, the cross-section of the first guide structure perpendicular to the guide direction and the cross-section of the second guide structure perpendicular to the guide direction may each have other regular or irregular shapes.

[0101] In this embodiment, the first guide structure 121 and the second guide structure 122 are symmetrically arranged relative to the center line of the heat exchange tube hole 112, which is parallel to the airflow direction a. It is understood that in some other embodiments, the first guide structure and the second guide structure may not be symmetrical relative to the center line, and the structures of the first guide structure and the second guide structure may even be different.

[0102] Understandable Figure 1 Only a portion of the heat exchange fin structure is shown. Specifically, the size of the heat exchange fins and the number of heat exchange tube holes 112 on the heat exchange fins can be set according to the specific needs.

[0103] Optionally, in some embodiments, two heat exchange fins can be joined together, thereby increasing the applicability of the heat exchange fins.

[0104] See Figure 6 In another embodiment of this application, the heat exchange fin 200 is different from the heat exchange fin 100 in that the first guide structure 121 has a first guide surface 1215 and the second guide structure 122 has a second guide surface 1225.

[0105] Furthermore, in this embodiment, the starting end of the first guide surface 1215 is located on the first center line b; the starting end of the second guide surface 1225 is located on the first center line b. In other embodiments, the upstream of the first guide surface may also have a guide plane; similarly, the upstream of the second guide surface may also have a guide plane.

[0106] See Figure 7 The heat exchange fin 300 provided in another embodiment of this application differs from the heat exchange fin 200 in that the first guide surface 1215 and the second guide surface 1225 have different shapes.

[0107] See Figure 8 In another embodiment of this application, the heat exchange fin 400 differs from the heat exchange fin 200 in that the first guide surface 1215 and the second guide surface 1225 have different shapes.

[0108] See Figure 9 In another embodiment of this application, the heat exchange fin 500 is different from the heat exchange fin 200 in that the first guide surface 1215 and the second guide surface 1225 are both arc-shaped.

[0109] In this embodiment, the vortex generator 120 further includes a third guide structure 123 and a fourth guide structure 124. The third guide structure 123 is located on the side of the first guide structure 121 away from the corresponding heat exchange tube hole 112, thereby guiding the airflow between the first guide structure 121 and the third guide structure 123 to the leeward side of the heat exchange tube hole 112, further improving the heat exchange efficiency on the leeward side of the heat exchange tube hole 112. The fourth guide structure 124 is located on the side of the second guide structure 122 away from the corresponding heat exchange tube hole 112, thereby guiding the airflow between the second guide structure 122 and the fourth guide structure 124 to the leeward side of the heat exchange tube hole 112, further improving the heat exchange efficiency on the leeward side of the heat exchange tube hole 112. That is, the arrangement of the third guide structure 123 and the fourth guide structure 124 can effectively improve the overall heat exchange efficiency.

[0110] It is understandable that there is a gap between the third guide structure 123 and the first guide structure 121, and a gap between the fourth guide structure 124 and the second guide structure 122, so as to guide the flow of air.

[0111] Specifically, in this embodiment, the shape of the guide surface of the third guide structure 123 is the same as that of the guide surface of the first guide structure 121, both being arc-shaped. Along the guiding direction, the size of the gap between the third guide structure 123 and the first guide structure 121 varies little, thereby better guiding the airflow.

[0112] Specifically, in this embodiment, the shape of the guide surface of the fourth guide structure 124 is the same as that of the guide surface of the second guide structure 122, both being arc-shaped. Along the guiding direction, the size of the gap between the fourth guide structure 124 and the second guide structure 122 varies little, thereby better guiding the airflow.

[0113] In this embodiment, similarly, the initial guiding position of the third guiding structure 123 is located on the first center line b, and the initial guiding position of the fourth guiding structure 124 is located on the first center line b, thereby further improving the overall heat exchange efficiency of the finned tube heat exchanger.

[0114] The table below shows the heat transfer results of different embodiments and comparative examples of heat exchange fins under the same oncoming wind speed:

[0115]

[0116]

[0117]

[0118] In the table above, the flat heat exchange fins and corrugated heat exchange fins are used as comparative examples, representing heat exchange fins without vortex generators. The structures of the vortex generators in Examples 1 to 5 correspond to the structures of the vortex generators in heat exchange fins 100, 200, 300, 400, and 500, respectively. Except for the flat heat exchange fins, all other heat exchange fins are corrugated. Other than that, all other parameters in the different examples in the table are the same. In Examples 1 to 5, the height of the first and second guide structures is 1.45 mm, and the center distance of the heat exchange tubes is W = 4 mm. As can be seen from the table above, compared to the two comparative examples of flat and corrugated heat exchange fins, the Nusselt number Nu, heat transfer capacity Q, and heat transfer factor j of Examples 1 to 5 are all increased, indicating better heat transfer performance.

[0119] For the variation of the Nusselt number Nu with the Reynolds number Re in the table above for multiple embodiments, please refer to [reference needed]. Figure 10 As shown in the figure, compared with the two comparative examples of flat finned heat exchangers and corrugated finned heat exchangers, Examples 1 to 5 all have higher Nusselt numbers (Re) at different Reynolds numbers (Re), indicating better heat exchange performance.

[0120] Another embodiment of this application provides a finned tube heat exchanger, which includes heat exchange tubes and heat exchange fins as provided in any embodiment of this application; the heat exchange tubes are inserted into the heat exchange tube holes of the heat exchange fins. It is understood that the heat exchange tubes and heat exchange fins are in thermal contact.

[0121] In the aforementioned finned tube heat exchanger, the first and second guiding structures of the vortex generator effectively guide the airflow to the leeward side of the heat exchange tube, reducing the flow stagnation area on the leeward side of the heat exchange tube, increasing the turbulence of the airflow, promoting heat exchange between the airflow and the structure on the leeward side of the heat exchange tube, and significantly improving the overall heat exchange efficiency of the finned tube heat exchanger.

[0122] Optionally, the finned tube heat exchanger includes multiple heat exchange fins stacked together to improve the heat exchange efficiency of the finned tube heat exchanger.

[0123] Optionally, in the direction perpendicular to the heat exchange fins, the ratio of the height of the first guide structure to the spacing between the heat exchange fins falls within the range of 0.2 to 0.8. In two adjacent heat exchange fins, the first guide structure on the bottom heat exchange fin also forms a channel for airflow between it and the top heat exchange fin. When the above conditions are met between adjacent heat exchange fins, the resistance to fluid flow can be reduced.

[0124] Optionally, in the direction perpendicular to the heat exchange fins, the ratio of the height of the first guide structure to the spacing between the heat exchange fins falls within the range of 0.2 to 0.8. In two adjacent heat exchange fins, the second guide structure on the bottom heat exchange fin also forms a channel for airflow between it and the top heat exchange fin. When the above conditions are met between adjacent heat exchange fins, the resistance to fluid flow can be reduced.

[0125] It is understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0126] It is understood that the various implementation methods described in this application can be implemented individually or in combination, and the embodiments of this application are not limited in this respect.

[0127] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the aforementioned method implementations, and will not be repeated here.

[0128] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A heat exchange fin, characterized in that, The heat exchange fins have a preset airflow direction; the heat exchange fins include: A fin body, the fin body having a first heat exchange surface; the fin body having a plurality of heat exchange tube holes penetrating the fin body; the heat exchange tube holes having a first center line perpendicular to both the airflow direction and the axial direction of the heat exchange tube holes; and A plurality of vortex generators are disposed on the first heat exchange surface to guide the airflow from the windward side of the heat exchange tube orifice to the leeward side of the heat exchange tube orifice; the vortex generator includes a first guide structure and a second guide structure respectively disposed on both sides of the heat exchange tube orifice; the initial guiding position of the first guide structure is located on the first center line corresponding to the heat exchange tube orifice; the initial guiding position of the second guide structure is located on the first center line corresponding to the heat exchange tube orifice. The distance between the initial guiding position of the first guiding structure and the heat exchange tube hole satisfies the following condition: 0.15<L1 / (0.5*Wd)<0.6; Wherein, L1 is the distance between the starting guide position of the first guide structure and the heat exchange tube hole; W is the distance between adjacent heat exchange tube holes arranged along the direction of the first center line; and d is half the size of the heat exchange tube hole along the direction of the first center line. And / or, the distance between the initial guiding position of the second guiding structure and the heat exchange tube hole satisfies the following condition: 0.15<L2 / (0.5*Wd)<0.6; Wherein, L2 is the distance between the starting guide position of the second guide structure and the heat exchange tube hole; W is the distance between adjacent heat exchange tube holes arranged along the direction of the first center line; and d is half the size of the heat exchange tube hole along the direction of the first center line.

2. The heat exchange fins according to claim 1, characterized in that, The first guide structure has a first guide plane; the guiding extension direction of the first guide plane is inclined toward one side of the heat exchange tube hole; The second guide structure has a second guide plane; the guiding extension direction of the second guide plane is inclined toward one side of the heat exchange tube hole.

3. The heat exchange fins according to claim 2, characterized in that, The starting end of the first guide plane is located on the first center line; the ending end of the first guide plane is located on the leeward side of the corresponding heat exchange tube hole; the angle between the guiding extension direction of the first guide plane and the airflow direction is in the range of 25° to 60°. And / or, the starting end of the second guide plane is located on the first center line; the ending end of the second guide plane is located on the leeward side of the corresponding heat exchange tube hole; the angle between the guiding extension direction of the second guide plane and the airflow direction is in the range of 25° to 60°.

4. The heat exchange fins according to claim 2, characterized in that, The top of the first guide plane is inclined away from the side corresponding to the heat exchange tube hole, and the angle between the first guide plane and the axial direction of the corresponding heat exchange tube hole is in the range of 25° to 45°. And / or, the top of the second guide plane is inclined away from the side corresponding to the heat exchange tube hole, and the angle between the second guide plane and the axial direction of the corresponding heat exchange tube hole is in the range of 25° to 45°.

5. The heat exchange fins according to any one of claims 1, 3, and 4, characterized in that, The guide surface of the first guide structure is a first guide surface; the guide surface of the second guide structure is a second guide surface; The tail end of the first guide surface bends toward the leeward side of the corresponding heat exchange tube hole; the starting end of the first guide surface is provided with a first starting transition section; along the guiding direction, the height of the first starting transition section gradually increases from the starting end; the tail end of the first guide surface is provided with a first tail transition section; along the guiding direction, the height of the first tail transition section gradually decreases from the starting end. And / or, the tail end of the second guide surface bends toward the leeward side near the corresponding heat exchange tube hole; the starting end of the second guide surface is provided with a second starting transition section; along the guiding direction, the height of the second starting transition section gradually increases from the starting end; the tail end of the second guide surface is provided with a second tail transition section; along the guiding direction, the height of the second tail transition section gradually decreases from the starting end.

6. The heat exchange fins according to claim 1, characterized in that, The first guide structure has a first guide surface; the starting end of the first guide surface is located on the first center line; the first guide surface is arc-shaped. And / or, the second guide structure has a second guide surface; the starting end of the second guide surface is located on the first center line; the second guide surface is arc-shaped.

7. The heat exchange fins according to any one of claims 1, 3, and 4, characterized in that, The vortex generator further includes a third guide structure and a fourth guide structure; the third guide structure is located on the side of the first guide structure away from the heat exchange tube hole; the fourth guide structure is located on the side of the second guide structure away from the heat exchange tube hole. The starting guide position of the third guide structure is located on the first center line; the starting guide position of the fourth guide structure is located on the first center line.

8. A finned tube heat exchanger, characterized in that, The finned tube heat exchanger includes a heat exchange tube and heat exchange fins as described in any one of claims 1 to 7; the heat exchange tube is inserted into the heat exchange tube hole of the heat exchange fin.

9. The finned tube heat exchanger according to claim 8, characterized in that, The finned tube heat exchanger includes multiple heat exchange fins stacked together. In the direction perpendicular to the heat exchange fins, the ratio of the height of the first guide structure to the spacing of the heat exchange fins falls within the range of 0.2 to 0.

8. In the direction perpendicular to the heat exchange fins, the ratio of the height of the first guide structure to the spacing of the heat exchange fins falls within the range of 0.2 to 0.8.

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