Finned tube heat exchanger and heat exchange fins

Abstract

The invention provides a finned tube heat exchanger and heat exchange fins. The invention discloses a heat exchange fin. The heat exchange fin has a preset airflow flowing direction. The heat exchange fin comprises a fin body and a first heat exchange plate, wherein the fin body is provided with a first heat exchange surface; a plurality of heat exchange tube holes penetrating through the fin body are formed in the fin body; each heat exchange tube hole is provided with a first center line perpendicular to the flowing direction of the air flow and the axial direction of the heat exchange tube hole; the vortex generators are arranged on the first heat exchange face so as to guide airflow on the windward sides of the heat exchange pipe holes to flow to the leeward sides of the heat exchange pipe holes. The vortex generator comprises a first guide structure and a second guide structure which are arranged on the two sides of the corresponding heat exchange pipe holes correspondingly. The initial guiding position of the first guiding structure is located on the first center line of the corresponding heat exchange pipe hole. The initial guiding position of the second guiding structure is located on the first center line of the corresponding heat exchange pipe hole. The vortex generator effectively promotes heat exchange between airflow and the structure of the leeward side of the heat exchange pipe, and the overall heat exchange efficiency is remarkably improved.

Description

Technical Field

[0001] The present application relates to the field of heat exchangers, and specifically to a fin-tube heat exchanger and a heat exchange fin. Background Art

[0002] In modern industrial production, finned tube heat exchangers are used as heat exchange equipment because of their high heat transfer coefficient, convenient medium heat exchange, simple production, and easy installation. They are widely used in heating, refrigeration, thermal power generation, chemical industry, metallurgy and other fields. With the development of the industry, the requirements for the heat exchange efficiency of finned tube heat exchangers are getting higher and higher. 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] Multiple embodiments of the present application provide a fin-tube heat exchanger and heat exchange fins that can improve heat exchange efficiency.

[0004] In one aspect, the present application provides a heat exchange fin, wherein the heat exchange fin has a preset airflow direction; the heat exchange fin comprises:

[0005] A fin body, wherein the fin body has a first heat exchange surface; the fin body is provided with a plurality of 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; and

[0006] 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 flow to the leeward side of the heat exchange tube hole; the vortex generator includes a first guide structure and a second guide structure respectively arranged on both sides of the corresponding heat exchange tube hole; the starting guide position of the first guide structure is located on the first center line corresponding to the heat exchange tube hole; the starting 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 starting guide position of the first guide structure and the heat exchange tube hole satisfies the 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 the heat exchange tube holes arranged adjacently along the direction of the first center line; 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 starting guide position of the second guide structure and the heat exchange tube hole meets the condition:

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

[0012] Among them, 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 adjacently along the direction of the first center line; 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 guiding plane and the flow direction of the airflow is within a range of 25° to 60°;

[0020] And / or, the angle between the guiding extension direction of the second guiding plane and the flow direction of the airflow is within 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 end of the second guide plane is inclined toward a side away from the corresponding heat exchange tube hole, and the axial angle between the second guide plane and the corresponding heat exchange tube hole is in the range of 25° to 45°.

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

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

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

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

[0027] A first starting transition section is provided at the starting end of the first guide surface; along the guiding direction, the first starting transition section gradually increases in height starting 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 guiding direction, the second starting transition section gradually increases in height starting 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, a second tail transition section is provided at the tail end of the second guide surface; along the guiding 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 curved surface;

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

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

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

[0035] In some embodiments, the first guide curved surface is in the shape of an arc surface;

[0036] And / or, the second guide curved surface is in an arc shape.

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

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

[0039] On the other hand, the present application also provides a fin-tube heat exchanger, which includes a heat exchange tube and a heat exchange fin provided by the present application; the heat exchange tube is inserted into the heat exchange tube hole of the heat exchange fin.

[0040] In some embodiments, the fin-tube heat exchanger includes a plurality of heat exchange fins arranged in a stacked manner;

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

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

[0043] In multiple embodiments provided in the present application, in a fin-tube heat exchanger using the heat exchange fins provided in the present application, the first guide structure and the second guide structure of the vortex generator effectively guide the airflow to the leeward side of the heat exchange tube, thereby reducing the flow retention 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 fin-tube heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic diagram of the structure of a heat exchange fin provided for one embodiment of the present application.

[0045] Figure 2 for Figure 1 Schematic diagram of the local structure of the heat exchange fins.

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

[0047] Figure 4 for Figure 1 Cross-sectional view of the heat exchange fin along the MM direction.

[0048] Figure 5 for Figure 1 Cross-sectional view of the heat exchange fin along the NN direction.

[0049] Figure 6 A schematic structural diagram of a heat exchange fin provided in another embodiment of the present application.

[0050] Figure 7 A schematic structural diagram of a heat exchange fin provided in another embodiment of the present application.

[0051] Figure 8 A schematic structural diagram of a heat exchange fin provided in another embodiment of the present application.

[0052] Fig. 9 A schematic structural diagram of a heat exchange fin provided in another embodiment of the present application.

[0053] Fig.10 The graphs are the variation of Nusselt number Nu with Reynolds number Re of Examples 1 to 5, Comparative Example 1 and Comparative Example 2.

[0054] Description of Reference Numerals

[0055] 100 / 200 / 300 / 400 / 500, heat exchange fins; 110, fin body; 111, first heat exchange surface; 112, heat exchange tube holes; b, first center line; 120, vortex generator; 121, first guide structure; 1211, first guide plane; 1212, first guide surface; 1213, first starting 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 starting transition section; 1224, second tail transition section; 1225, second guide curved surface; 123, third guide structure; 124, fourth guide structure; a, airflow direction. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

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

[0058] Unless otherwise stated, all technical and scientific terms used in this application have the same meaning as those generally understood by those skilled in the art of the technical field of this application. The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit the scope of this application. The term "and / or" used in this application includes any and all combinations of one or more related listed items. The singular forms of "a", "above", and "the" used in this application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0059] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0060] In the description of the present application, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of simplified description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation on the present application.

[0061] In the description of this application, unless otherwise clearly defined, the terms "install", "connect", "connect", "fix", "set", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0062] In the description of the present application, unless otherwise clearly defined, a first feature being “on”, “above”, “above”, “below”, “below”, “below” or “below” a second feature may mean that the first feature is in direct contact with the second feature, or the first feature and the second feature are in indirect contact with each other through an intermediate medium. Moreover, a first feature being “on”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the horizontal height of the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0063] After research, the R&D personnel found that in the fin-tube heat exchanger, due to the obstruction of the heat exchange tube, the airflow cannot flow to the leeward side of the heat exchange tube, which makes it difficult for the leeward side of the heat exchange tube to exchange heat with the airflow, resulting in low heat exchange efficiency of the fin-tube heat exchanger.

[0064] Based on this, the researchers proposed a heat exchange fin with a preset airflow direction. The heat exchange fin includes a fin body and a plurality of vortex generators. Among them, the fin body has a first heat exchange surface; the fin body is provided with a plurality of heat exchange tube holes penetrating the fin body; the heat exchange tube hole has a first center line perpendicular to both the airflow direction and the axial direction of the heat exchange tube hole; a plurality of vortex generators are provided 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 includes a first guide structure and a second guide structure respectively provided on both sides of the corresponding heat exchange tube hole; the starting guide position of the first guide structure is located on the first center line of the corresponding heat exchange tube hole; the starting guide position of the second guide structure is located on the first center line of the corresponding heat exchange tube hole.

[0065] In the fin-tube heat exchanger using the above-mentioned heat exchange fins, the first guide structure and the second guide structure of the vortex generator effectively guide the airflow to the leeward side of the heat exchange tube, reduce the flow retention area on the leeward side of the heat exchange tube, increase the turbulence of the airflow, promote the heat exchange between the airflow and the structure on the leeward side of the heat exchange tube, and significantly improve the overall heat exchange efficiency of the fin-tube heat exchanger.

[0066] See also Figures 1 to 5 The heat exchange fin 100 provided in one embodiment of the present 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 hole 112 has a first center line b perpendicular to both the airflow direction a and the axial direction of the heat exchange tube hole 112. A plurality of vortex generators 120 are arranged on the first heat exchange surface 111 to guide the airflow on the windward side of the heat exchange tube hole 112 to flow 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 arranged on both sides of the corresponding heat exchange tube hole 112; the starting guide position of the first guide structure 121 is located on the first center line b of the corresponding heat exchange tube hole 112; the starting guide 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 can be understood that the side through which the airflow first flows is the windward side of the heat exchange tube hole 112, and the side opposite to the windward side is the leeward side. The windward side of the heat exchange tube hole 112 is the windward side of the heat exchange tube, and the leeward side of the heat exchange tube hole 112 is the leeward side of the heat exchange tube. Figure 2 , the windward side of the heat exchange tube hole 112 is Figure 2 The right side of the heat exchange tube hole 112; the leeward side of the heat exchange tube hole 112, Figure 2 The left side of the middle heat exchange tube hole 112.

[0068] It can be understood that the heat exchange tube holes 112 are used for the heat exchange tubes to pass through.

[0069] It is understandable 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 the fin-tube heat exchanger using the heat exchange fin 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 tube, reduce the flow retention area on the leeward side of the heat exchange tube, increase the turbulence of the airflow, promote the heat exchange between the airflow and the structure on the leeward side of the heat exchange tube, and significantly improve the overall heat exchange efficiency of the fin-tube heat exchanger. In other words, the setting of the vortex generator 120 changes the velocity field and the flow direction of the temperature field of the airflow, reduces the angle between the velocity and the temperature gradient, thereby improving the synergistic effect of the temperature, enhancing the overall heat exchange efficiency, and reducing energy consumption.

[0071] In addition, after the fluid flows through the leeward side of the heat exchange tube, it will continue to form a rotating vortex that flows along the airflow direction a. The generation of the rotating vortex can effectively disturb the fluid boundary layer of the airflow, reduce the thickness of the fluid boundary layer, and improve the heat exchange efficiency. Furthermore, the generation of the rotating vortex can also, to a certain extent, exchange heat with the airflow in the adjacent area, thereby improving the overall heat exchange efficiency.

[0072] In addition, the starting guide position of the first guide structure 121 is located on the first center line b of the corresponding heat exchange tube hole 112; the starting guide position of the second guide structure 122 is located on the first center line b of the corresponding heat exchange tube hole 112. After the airflow flows to the first center line b of the corresponding heat exchange tube hole 112, the airflow is guided to flow to the leeward side of the heat exchange tube hole 112, without reversely adjusting the flow direction of the airflow along the direction of the first center line b, so that the airflow can be more smoothly guided to flow to the leeward side of the heat exchange tube hole 112, thereby improving the overall heat exchange efficiency of the fin tube heat exchanger.

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

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

[0075] Among them, L1 is the distance between the starting guide position of the first guide structure 121 and the heat exchange tube hole 112; W is the center distance of the heat exchange tube holes 112 arranged adjacent to each other along the direction of the first center line b; d is half the size of the heat exchange tube hole 112 along the direction of the first center line b.

[0076] The distance between the starting guide position of the first guide structure 121 and the heat exchange tube hole 112 meets the above conditions, and the amount of airflow flowing to the leeward side of the heat exchange tube hole 112 can be better controlled to further improve the overall heat exchange efficiency. It can be understood that during the flow of the airflow, on the one hand, heat is exchanged with the side wall of the heat exchange tube, and on the other hand, heat is exchanged with the first heat exchange surface 111. Therefore, appropriately controlling the flow rate of the airflow flowing to the leeward side of the heat exchange tube hole 112 can improve the overall heat exchange efficiency.

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

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

[0079] Among them, L2 is the distance between the starting guide position of the second guide structure 122 and the heat exchange tube hole 112; W is the center distance of the heat exchange tube holes 112 arranged adjacent to each other along the direction of the first center line b; d is half the size of the heat exchange tube hole 112 along the direction of the first center line b.

[0080] The distance between the starting guide position of the second guide structure 122 and the heat exchange tube hole 112 meets the above conditions, and the amount of airflow flowing to the leeward side of the heat exchange tube hole 112 can be better controlled to further improve the overall heat exchange efficiency. It can be understood that during the flow of the airflow, on the one hand, heat is exchanged with the side wall of the heat exchange tube, and on the other hand, heat is also exchanged with the first heat exchange surface 111. Therefore, appropriately controlling the flow rate of the airflow flowing to the leeward side of the heat exchange tube hole 112 can improve the overall heat exchange efficiency.

[0081] Specifically in this embodiment, the heat exchange tube hole 112 is cylindrical, so 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 guiding extension direction of the first guide plane 1211 is inclined toward one side of the heat exchange tube hole 112, and the first guide plane 1211 is a plane, so as to more smoothly guide the flow direction of the airflow and avoid excessive turbulence during the flow of the airflow, so as to better guide the airflow between the first guide plane 1211 and the heat exchange tube hole 112 to flow toward the leeward side of the heat exchange tube hole 112; in addition, the guiding extension direction of the first guide plane 1211 is inclined toward one side of the heat exchange tube hole 112, so as to reduce 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 guiding extension direction of the second guide plane 1221 is inclined toward one side of the heat exchange tube hole 112, and the second guide plane 1221 is a plane, so as to more smoothly guide the flow direction of the airflow and avoid excessive turbulence during the flow of the airflow, so as to better guide the airflow between the second guide plane 1221 and the heat exchange tube hole 112 to flow toward the leeward side of the heat exchange tube hole 112; in addition, the guiding extension direction of the second guide plane 1221 is inclined toward one side of the heat exchange tube hole 112, so as to reduce 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 can be understood that in other embodiments, the upstream of the first guide plane also has a guide curved surface; the upstream of the second guide plane also has a guide curved 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. Thus, the airflow can be better guided to the leeward side of the heat exchange tube hole 112 to improve 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 guiding plane 1211 and the airflow flow direction a falls within the range of 25° to 60° to improve the overall heat exchange efficiency of the fin-tube heat exchanger. Specifically, the angle α between the guiding extension direction of the first guiding plane 1211 and the airflow flow 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 included angle β between the guide extension direction of the second guide plane 1221 and the airflow flow direction a falls within the range of 25° to 60° to improve the overall heat exchange efficiency of the fin-tube heat exchanger. Specifically, the included angle β between the guide extension direction of the second guide plane 1221 and the airflow flow 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 of the first guide plane 1211 is inclined toward the side away from the corresponding heat exchange tube hole 112, and the axial angle γ between the first guide plane 1211 and 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. In this way, the resistance to the airflow can be reduced, making the airflow flow smoother. Specifically, the axial angle γ between the first guide plane 1211 and the corresponding heat exchange tube hole 112 can be any value in the range of 25° to 45°, such as 25°, 28°, 30°, 32°, 35°, 38°, 40°, 42° or 45°.

[0089] Optionally, the top of the second guide plane 1221 is inclined toward a side away from the corresponding heat exchange tube hole 112, and the axial angle δ between the second guide plane 1221 and 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. In this way, the resistance to the airflow can be reduced, making the airflow flow smoother. Specifically, the axial angle δ between the second guide plane 1221 and 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 one guide plane, namely, the first guide plane 1211; the second guide structure 122 has one guide plane, namely, the second guide plane 1221. It can be understood that in other embodiments, the first guide structure may also have a plurality of continuous or discontinuous guide planes; the second guide structure may also have a plurality of continuous or discontinuous guide planes.

[0091] In this embodiment, the guide surface of the first guide structure 121 is the first guide surface 1212; the tail end of the first guide surface 1212 is bent toward the leeward side close to the corresponding heat exchange tube hole 112, so that the airflow can better exchange heat with the leeward side of the heat exchange tube, thereby improving the overall heat exchange efficiency.

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

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

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

[0095] In this embodiment, a first tail transition section 1214 is provided at the tail end of the first guide surface 1212; 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, so as to reduce the air pressure on the leeward side of the heat exchange tube, promote the flow of airflow, and improve the overall heat exchange efficiency.

[0096] In this embodiment, the guide surface of the second guide structure 122 is a second guide surface 1222. A second tail transition section 1224 is provided at the tail end of the second guide surface 1222; along the guide direction, the second tail transition section 1224, starting from the starting end, gradually decreases in height, so that the airflow on the leeward side of the heat exchange tube can flow out smoothly, so as to reduce the air pressure on the leeward side of the heat exchange tube, promote the flow of airflow, and improve the overall heat exchange efficiency.

[0097] In this embodiment, the first heat exchange surface 111 of the fin body 110 is double-corrugated, so that the first heat exchange surface 111 has a larger heat exchange area, thereby improving the heat exchange efficiency. In addition, the flow resistance of the airflow can also be reduced. It is understood that in other embodiments, the first heat exchange surface can also be a plane, or other regular or irregular curved surface.

[0098] See also Figure 4 and Figure 5 In this embodiment, the cross section of the first guide structure 121 perpendicular to the guide direction is roughly in the shape of 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, and the connection is more stable. Similarly, the cross section of the second guide structure 122 perpendicular to the guide direction is also roughly in the shape of 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, and the connection is more stable.

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

[0100] It can be 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 can also be in other regular or irregular shapes respectively.

[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 can be understood that in other embodiments, the first guide structure and the second guide structure may not be symmetrical relative to the center line, and even the structures of the first guide structure and the second guide structure may be different.

[0102] Understandably, Figure 1 Only a part of the structure of the heat exchange fin is shown. Specifically, the size of the heat exchange fin and the number of the heat exchange tube holes 112 on the heat exchange fin can be set accordingly according to the timing requirements.

[0103] Optionally, in some embodiments, two heat exchange fins may be spliced ​​together to increase the applicability of the heat exchange fins.

[0104] See also Figure 6 A heat exchange fin 200 provided in another embodiment of the present application is different from the heat exchange fin 100 in that the first guide structure 121 has a first guide curved surface 1215 ; and the second guide structure 122 has a second guide curved surface 1225 .

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

[0106] See also Figure 7 A heat exchange fin 300 provided in another embodiment of the present application is different from the heat exchange fin 200 in that the shapes of the first guide curved surface 1215 and the second guide curved surface 1225 are different.

[0107] See also Figure 8 A heat exchange fin 400 provided in another embodiment of the present application is different from the heat exchange fin 200 in that the shapes of the first guide curved surface 1215 and the second guide curved surface 1225 are different.

[0108] See also Fig. 9 A heat exchange fin 500 provided in another embodiment of the present application is different from the heat exchange fin 200 in that the first guide curved surface 1215 and the second guide curved surface 1225 are both in the shape of arc surfaces.

[0109] In this embodiment, the vortex generator 120 also includes a third guide structure 123 and a fourth guide structure 124. The third guide structure 123 is arranged on the side of the first guide structure 121 away from the corresponding heat exchange tube hole 112, so as to guide the airflow flowing between the first guide structure 121 and the third guide structure 123 to flow 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 arranged on the side of the second guide structure 122 away from the corresponding heat exchange tube hole 112, so as to guide the airflow flowing between the second guide structure 122 and the fourth guide structure 124 to flow 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 can be understood that there is a gap between the third guide structure 123 and the first guide structure 121 , and there is a gap between the fourth guide structure 124 and the second guide structure 122 , so as to guide the flow of airflow.

[0111] Specifically in this embodiment, the shape of the guide surface of the third guide structure 123 is the same as the shape of the guide surface of the first guide structure 121, both of which are arc-shaped. Along the guide direction, the interval between the third guide structure 123 and the first guide structure 121 changes slightly, thereby better guiding the flow of air.

[0112] Specifically in this embodiment, the shape of the guide surface of the fourth guide structure 124 is the same as the shape of the guide surface of the second guide structure 122, and both are also in the shape of an arc surface. Along the guide direction, the interval between the fourth guide structure 124 and the second guide structure 122 changes slightly, thereby better guiding the flow of air.

[0113] In this embodiment, similarly, the starting guiding position of the third guiding structure 123 is located on the first center line b, and the starting 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 fin-tube heat exchanger.

[0114] The following table shows the heat exchange results of different embodiments and comparative examples of heat exchange fins at the same headwind speed:

[0115]

[0116]

[0117]

[0118] In the above table, the flat plate heat exchange fin and the corrugated plate heat exchange fin, as comparative examples, are 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 the aforementioned heat exchange fins 100, 200, 300, 400 and 500, respectively; except for the flat plate heat exchange fins, the types of other heat exchange fins are all corrugated plate heat exchange fins; in addition, the other parameters of different embodiments in the above table are the same. In Examples 1 to 5, the height of the first guide structure and the second guide structure is 1.45 mm, and the center distance of the heat exchange tube is W = 4 mm. It can be seen from the above table that compared with the two comparative examples of the flat plate heat exchange fin and the corrugated plate heat exchange fin, the Nusselt number Nu, the heat exchange amount Q and the heat exchange factor j of Examples 1 to 5 are all increased, that is, they have a better heat exchange effect.

[0119] See the table above for the variation of Nusselt number Nu with Reynolds number Re for the various embodiments. Fig.10 As can be seen from the figure, compared with the two comparative examples of flat plate heat exchange fins and corrugated plate heat exchange fins, the Nusselt numbers Nu of Examples 1 to 5 are all higher at different Reynolds numbers Re, that is, they have better heat exchange effects.

[0120] Another embodiment of the present application provides a fin-tube heat exchanger, which includes a heat exchange tube and a heat exchange fin provided in any embodiment of the present application; the heat exchange tube is inserted into the heat exchange tube hole of the heat exchange fin. It can be understood that the heat exchange tube is in thermal contact with the heat exchange fin.

[0121] In the above-mentioned fin-tube heat exchanger, the first guide structure and the second guide structure of the vortex generator effectively guide the airflow to the leeward side of the heat exchange tube, reduce the flow retention area on the leeward side of the heat exchange tube, increase the turbulence of the airflow, promote the heat exchange between the airflow and the structure on the leeward side of the heat exchange tube, and significantly improve the overall heat exchange efficiency of the fin-tube heat exchanger.

[0122] Optionally, the fin-tube heat exchanger includes a plurality of heat exchange fins arranged in a stacked manner to improve the heat exchange efficiency of the fin-tube heat exchanger.

[0123] Optionally, in a 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 a range of 0.2 to 0.8. In two adjacent heat exchange fins, a channel for airflow will also be formed between the first guide structure on the bottom heat exchange fin 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 a 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 a range of 0.2 to 0.8. In two adjacent heat exchange fins, a channel for airflow is also formed between the second guide structure on the bottom heat exchange fin 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 can be understood that in the various embodiments of the present application, the size of the serial number of each process does not mean 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 the present application.

[0126] It can be 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 to this.

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

[0128] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A heat exchange fin, characterized in that: The heat exchange fin has a preset airflow direction; the heat exchange fin comprises: A fin body, wherein the fin body has a first heat exchange surface; the fin body is provided with a plurality of 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; 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 flow to the leeward side of the heat exchange tube hole; the vortex generator includes a first guide structure and a second guide structure respectively arranged on both sides of the corresponding heat exchange tube hole; the starting guide position of the first guide structure is located on the first center line corresponding to the heat exchange tube hole; the starting guide position of the second guide structure is located on the first center line corresponding to the heat exchange tube hole.

2. The heat exchange fin according to claim 1, characterized in that: The distance between the starting guide position of the first guide structure and the heat exchange tube hole meets the 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 the heat exchange tube holes arranged adjacently along the direction of the first center line; 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 starting guide position of the second guide structure and the heat exchange tube hole meets the condition: 0.15<L2 / (0.5*Wd)<0.6; Among them, 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 adjacently along the direction of the first center line; d is half the size of the heat exchange tube hole along the direction of the first center line.

3. The heat exchange fin according to claim 1 or 2, 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.

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

5. The heat exchange fin according to claim 1, characterized in that: 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°; And / or, the top end of the second guide plane is inclined toward a side away from the corresponding heat exchange tube hole, and the axial angle between the second guide plane and the corresponding heat exchange tube hole is in the range of 25° to 45°.

6. The heat exchange fin according to any one of claims 1, 2, 4 and 5, characterized in that: The guiding surface of the first guiding structure is a first guiding surface; the guiding surface of the second guiding structure is a second guiding surface; The tail end of the first guide surface is bent toward the leeward side close to 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 first starting transition section gradually increases in height 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 first tail transition section gradually decreases in height from the starting end; And / or, the tail end of the second guide surface is bent toward the leeward side corresponding to the 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 second starting transition section gradually increases in height starting 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 second tail transition section gradually decreases in height starting from the starting end.

7. The heat exchange fin according to claim 1 or 2, characterized in that: The first guide structure has a first guide curved surface; the starting end of the first guide curved surface is located on the first center line; the first guide curved surface is in an arc shape; And / or, the second guiding structure has a second guiding curved surface; the starting end of the second guiding curved surface is located on the first center line; and the second guiding curved surface is in an arc shape.

8. The heat exchange fin according to any one of claims 1, 2, 4 and 5, characterized in that: The vortex generator further comprises a third guide structure and a fourth guide structure; the third guide structure is arranged on a side of the first guide structure away from the corresponding heat exchange tube hole; the fourth guide structure is arranged on a side of the second guide structure away from the corresponding heat exchange tube hole; The starting guiding position of the third guiding structure is located on the first center line; the starting guiding position of the fourth guiding structure is located on the first center line.

9. A fin tube heat exchanger, characterized in that: The fin-tube heat exchanger comprises a heat exchange tube and the heat exchange fin according to any one of claims 1 to 8; the heat exchange tube is inserted into the heat exchange tube hole of the heat exchange fin.

10. The fin-tube heat exchanger according to claim 9, characterized in that: The fin-tube heat exchanger comprises a plurality of heat exchange fins arranged in a stacked manner; In a direction perpendicular to the heat exchange fins, a ratio of the height of the first guide structure to the spacing between the heat exchange fins falls within a range of 0.2 to 0.8; In a direction perpendicular to the heat exchange fins, a ratio of a height of the first guide structure to a spacing between the heat exchange fins falls within a range of 0.2 to 0.8.

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