Fin and heat exchanger

Abstract

The fin for the heat exchanger comprises a plurality of fin units arranged in a plurality of rows, and the fin units in every two adjacent rows are arranged in a staggered mode. Each fin unit comprises a first direction center line and a second direction center line which are perpendicular to each other. A hole having a center of circle at the intersection of the first and second direction centerlines and an inner radius R; the adjacent windowing areas are arranged on the two sides of the center line in the first direction or the second direction in a mirror image mode; and a flat region including a peripheral hole flat region between the hole and each windowing region. Each windowing area comprises a first boundary which is located on the side, facing the hole, of the corresponding windowing area and forms a boundary between the corresponding windowing area and the hole periphery flat area. The second boundary is positioned on one side, back to the hole, of the corresponding windowing area; third and fourth boundaries substantially parallel to the first direction centerline and the third boundary being farther from the first direction centerline than the fourth boundary; and a fifth boundary connecting the first and third boundaries. The first boundary is a first arc that is non-concentric with the bore, and the fifth boundary is substantially parallel to the second direction centerline.

Description

Technical Field

[0001] This application relates to fins and heat exchangers, and more particularly to improvements in fins for finned tube heat exchangers. Background Technology

[0002] Finned tube heat exchangers are widely used in industries such as refrigerators, air conditioners, food processing, and chemical processing. They provide a large heat exchange area in a relatively small volume. A finned tube heat exchanger has a series of spaced-apart plate-like fins and multiple heat exchange tubes extending through these fins. Heat exchange occurs between the fluid flowing in the heat exchange tubes (usually a refrigerant) and the fluid flowing between the fins (usually air). The fins are flat and have louvers to improve the heat exchange efficiency between the refrigerant and air. Summary of the Invention

[0003] According to one aspect of this application, a fin for a heat exchanger is provided, the fin comprising a plurality of fin units arranged in several rows, with adjacent rows of fin units staggered. Each fin unit includes: a first direction centerline (X) and a second direction centerline (Y) that are perpendicular to each other; a hole, the center of which is located at the intersection of the first direction centerline (X) and the second direction centerline (Y), and the hole having an inner radius R; four opening areas, two adjacent opening areas being mirror images of each other on either side of the first direction centerline (X) or the second direction centerline (Y); and a flat area, the flat area including a periphery flat area disposed between the hole and each opening area. Each of the windowed areas includes a first boundary, a second boundary, a third boundary, a fourth boundary, and a fifth boundary. The first boundary is located on the side of the corresponding windowed area facing the hole, forming the boundary line between the corresponding windowed area and the flat area around the hole. The second boundary is located on the side of the corresponding windowed area facing away from the hole. The third and fourth boundaries extend substantially parallel to the first direction centerline (X), with the third boundary being farther away from the first direction centerline (X) than the fourth boundary. The fifth boundary connects the first boundary and the third boundary. The first boundary is a first arc that is not concentric with the hole, and the fifth boundary extends substantially parallel to the second direction centerline (Y).

[0004] In some embodiments, the second boundary includes a first segment and a second segment connected to each other, the first segment being connected to the third boundary and the second segment being connected to the fourth boundary, wherein the first segment is a second arc that is not concentric with the hole, and the second segment is approximately parallel to the second direction centerline (Y).

[0005] In some embodiments, the flat area further includes a first window-interval flat area, which is disposed between each of the window opening areas and the second direction centerline (Y) and is continuously connected to the perimeter flat area, and the fifth boundary constitutes the boundary line between the corresponding window opening area and the first window-interval flat area.

[0006] In some embodiments, each fin unit includes: opposing front and rear edges and opposing left and right edges, the front and rear edges extending parallel to a first direction centerline (X), and the left and right edges extending parallel to a second direction centerline (Y). The distance from the front or rear edge to the first direction centerline (X) is V0, and the distance from the left or right edge to the second direction centerline (Y) is H0, where V0 is half the center-to-center spacing P1 of the fin units in adjacent rows, and H0 is half the center-to-center spacing Pt of adjacent fin units in the same row.

[0007] In some embodiments, the first boundary includes a first endpoint and a second endpoint, and is connected to the fifth boundary at the first endpoint and to the fourth boundary at the second endpoint. The distance from the first endpoint to the center line (Y) of the second direction is H1, the distance from the second endpoint to the center line (Y) of the second direction is H2, and the first boundary has a radius R1. H1 and H2 are determined by H0, and R1 is determined by R.

[0008] In some embodiments, H1 / H0 is 0.0686~0.1486, H2 / H0 is 0.514~0.571, and R1 / R is 2.308~4.231.

[0009] In some embodiments, the second boundary includes a third endpoint, a fourth endpoint, and a connection point. The second boundary connects to the third boundary at the third endpoint and to the fourth boundary at the fourth endpoint. A first segment and a second segment of the third boundary connect at the connection point. The distance from the fourth endpoint to the centerline (Y) of the second direction is H3, and the first segment of the second boundary has a radius R2. H3 is determined by H0, and R2 is determined by R.

[0010] In some embodiments, H3 / H0 is 0.891~0.937, and R2 / R is 2.115~3.077.

[0011] In some embodiments, each of the four window areas is provided with a plurality of window panels, and a slit is formed between adjacent window panels. The plurality of slits are distributed along a direction parallel to the second direction centerline (Y) and extend parallel to the first direction centerline (X).

[0012] In some embodiments, the distance from the first endpoint of the first boundary to the center line (X) in the first direction is V1, and the distance from its second endpoint to the center line (X) in the first direction is V2. The distance from the connection point of the second boundary to the center line (X) in the first direction is V3, the distance to the third endpoint of the second boundary is V4, and the distance from the center of the first segment of the second boundary to the center line (X) in the first direction is also V3. V1, V2, V3, and V4 are determined by the positions of the plurality of window panes and the plurality of slits.

[0013] In some embodiments, each of the four window areas is provided with a first window panel, a second window panel, a third window panel, and a fourth window panel. The first window panel is connected to the third boundary through its first edge, and the fourth window panel is connected to the fourth boundary through its fourth edge. A first gap is formed between the first window panel and the second window panel, a second gap is formed between the second window panel and the third window panel, and a third gap is formed between the third window panel and the fourth window panel. The distance from the first gap to the center line (X) in the first direction is V1, the distance from the fourth edge of the fourth window panel to the center line (X) in the first direction is V2, the distance from the third gap to the center line (X) in the first direction is V3, and the distance from the first edge of the first window panel to the third gap is V4.

[0014] In some embodiments, the flat area further includes a first edge flat area located on the side of each window area near the left edge or the right edge, and a second boundary forming a boundary line between each window area and the first edge flat area; a second edge flat area located on the side of each window area near the front edge or the rear edge, and a third boundary forming a boundary line between each window area and the second edge flat area; and a second inter-window flat area located on the side of each window area near the first direction central axis (X), and a fourth boundary forming a boundary line between each window area and the second inter-window flat area.

[0015] In some embodiments, the inner radius R of the hole is 2.6 mm.

[0016] According to another aspect of this application, a heat exchanger is provided, the heat exchanger comprising a plurality of fins according to this application, the plurality of fins being arranged in a stacked manner spaced apart from each other. Attached Figure Description

[0017] Figure 1 This is a schematic perspective view of an exemplary embodiment of the finned tube heat exchanger 100 according to this application; Figure 2AThis is a schematic perspective view of an exemplary embodiment of the fin 190 according to this application; Figure 2B yes Figure 2A A schematic front view of the fin unit 210 of the fin 190 shown; Figure 2C It is the fin unit 210 along Figure 2B A sectional view of line AA in the diagram; Figure 3A yes Figure 2B An enlarged view of a region of the finned unit 210 shown; Figure 3B yes Figure 3A A magnified view of the windowed area in the shown region; Figure 4A This is a partial schematic front view of a fin that differs from that in this application; Figure 4B This is a partial schematic perspective view of a fin that differs from that in this application. Detailed Implementation

[0018] Various specific embodiments of this application will now be described with reference to the accompanying drawings, which form part of this specification. It should be understood that although terms indicating direction, such as "front," "rear," "up," "down," "left," and "right," are used herein to describe various exemplary structural parts and elements, their use is merely for illustrative purposes and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed herein can be arranged in different orientations, these terms indicating direction are illustrative only and should not be considered limiting.

[0019] Figure 1 This is a schematic perspective view of an exemplary embodiment of the finned tube heat exchanger 100 according to this application. Figure 1 As shown, the finned tube heat exchanger 100 includes several heat exchange tubes 191 and several fins 190. The fins 190 are stacked parallel to each other, with adjacent fins spaced a certain distance apart to form airflow channels for airflow (e.g., airflow). Several heat exchange tubes 191 extend through each fin 190. The heat exchange tubes 191 are connected in pairs at one end by bends 192. The heat exchange tubes 191 can be used to guide fluid (e.g., coolant) through them. Fluid flowing in one direction in one heat exchange tube 191 can flow in the opposite direction through another heat exchange tube 191 after being redirected by the bend. Airflow can be allowed to flow along the surface of each fin 190 through the airflow channels between the fins 190, thereby exchanging heat with the fluid in the heat exchange tubes 191 through the fins 190 and the heat exchange tubes 191. It should be noted that... Figure 1This is only used to illustrate the connection of fin 190, heat exchange tube 191, and bend 192, and does not specifically show the structure of fin 190. Fin 190 in... Figure 1 The diagram is simplified, and the window area on fin 190 is omitted; the setting of the window area will be shown in a later figure.

[0020] The heat exchange tubes 191 can have any suitable size. The number of heat exchange tubes 191 can be arbitrary. The heat exchange tubes 191 can be made of any suitable material with good heat transfer properties. The number of fins 190 can also be arbitrary. The fins 190 can also have any suitable size. The fins 190 can be made of aluminum or any suitable metallic material with good heat transfer properties.

[0021] Figure 2A This is a schematic perspective view of an exemplary embodiment of the fin 190 according to this application. Figure 2A As shown, fin 190 is generally flat. Fin 190 includes several identical fin units 210. Figure 2A The fin 190 is shown to have two rows of fin units 210. It should be understood that in other embodiments, the fin 190 may have different numbers of rows of fin units, such as three or more rows.

[0022] refer to Figure 2A Each fin unit 210 has a hole 201 at its center, and the center of the hole 201 coincides with the center point of the fin unit 210. Several fin units 210 are arranged in two rows, with each row's fin units 210 connected sequentially. These two rows of fin units 210 are staggered so that the holes 201 in the two rows are also staggered, with the hole 201 in one row facing the connection point of two adjacent fin units 210 in the other row. Figure 2A As shown, the center-to-center distance between the center points of the fin units 210 in adjacent rows is P1, and the center-to-center distance between the center points of two adjacent fin units 210 in the same row is Pt.

[0023] Figure 2B and Figure 2C Show Figure 2A The overall structure of a fin unit 210 of fin 190 in the middle. Figure 2B yes Figure 2A A schematic front view of a fin unit 210 of the fin 190 shown. Figure 2C yes Figure 2B A cross-sectional view of fin unit 210 along line AA. (See figure) Figure 2B and Figure 2C As shown, the fin unit 210 is generally rectangular. The inner radius R of the hole 201 at the center of the fin unit 210 (see...) Figure 3A The fins 190 are matched to the outer diameter of the heat exchange tube 191, allowing the heat exchange tube 191 to pass through, such that the fins 190 are generally perpendicular to the heat exchange tube 191 and supported by the heat exchange tube 191. In some embodiments, the inner radius R of the hole 201 is 2.6 mm. The hole 201 has an outwardly bent flange 208, thereby having an outer radius R' (see...). Figure 3A The hole 201 extends a height H from the surface of the fin unit 210. The outer radius R' and height H of the hole 201 are set according to actual needs.

[0024] like Figure 2B As shown, the finned unit 210 has a virtual first direction centerline X and a second direction centerline Y passing through the aperture 201, the second direction centerline Y being perpendicular to the first direction centerline X. The intersection of the first direction centerline X and the second direction centerline Y is the center of the aperture 201. The finned unit 210 includes opposing front edges 272 and rear edges 274 extending parallel to the first direction centerline X, and opposing left edges 273 and right edges 275 extending parallel to the second direction centerline Y. When using the heat exchanger 100, the airflow is in a direction generally parallel to the second direction centerline Y (in... Figure 2B (Indicated by arrow B) flows over the surface of fin 190.

[0025] The first direction centerline X and the second direction centerline Y divide the fin unit 210 into four identical rectangular regions 242, 243, 244, and 245. Each of the four regions 242, 243, 244, and 245 has a quarter portion of the hole 201 and a corresponding window area 202, 203, 204, and 205. The window area of ​​each region 242, 243, 244, and 245 is spaced a certain distance from the corresponding front edge 272 / rear edge 274, left edge 273 / right edge 275, and hole 201, and the window areas of adjacent regions are also spaced a certain distance apart. Therefore, each region 242, 243, 244, and 245 not only has a window area but also a continuous flat area 212 surrounding the window area. The flat area 212 is the portion of the plate material of the fin 190 that has not been cut to form the window, which will be described in detail below.

[0026] The four regions 242, 243, 244, and 245 each include a first window area 202, a second window area 203, a third window area 204, and a fourth window area 205. These four window areas are arranged around the hole 201 in the following manner: the first window area 202 and the fourth window area 205 are mirror images of each other on both sides of the first direction centerline X (i.e., with the first direction centerline X as the axis of symmetry); the second window area 203 and the third window area 204 are mirror images of each other on both sides of the first direction centerline X (i.e., with the first direction centerline X as the axis of symmetry); the first window area 202 and the second window area 203 are mirror images of each other on both sides of the second direction centerline Y (i.e., with the second direction centerline Y as the axis of symmetry); and the third window area 204 and the fourth window area 205 are mirror images of each other on both sides of the second direction centerline Y (i.e., with the second direction centerline Y as the axis of symmetry).

[0027] Each of the four window opening areas 202, 203, 204, and 205 is provided with a window panel group 211. In the embodiment shown in the figure, each window panel group 211 includes four window panels: a first window panel 261, a second window panel 262, a third window panel 263, and a fourth window panel 264. These window panels are formed by cutting the plate material of the fin 190 into sheets and then flipping the cut sheets so that they are inclined towards the fin 190. The window panels in each window opening area extend a certain length along a direction parallel to the first direction centerline X, and several window panels are spaced apart from each other in a direction parallel to the second direction centerline Y. This will be discussed in conjunction with... Figure 3B As described in detail, a gap is formed between adjacent window panes.

[0028] As previously described, each region 242, 243, 244, and 245 also has a continuous flat region 212 surrounding its window area. Taking the first region 242 as an example, the flat region 212 includes a periapical flat region 251, a first edge flat region 252, a first inter-window flat region 253, a second edge flat region 254, and a second inter-window flat region 255. The periapical flat region 251 is located between the hole 201 and the first window area 202. The first edge flat region 252 is located on the side of the first window area 202 near the right edge 275, defined by the right edge 275, that is, on the side of the first window area 202 opposite to the hole 201, opposite to the periapical flat region 251. The first inter-window flat region 253 is located between the first window area 202 and the second direction centerline Y, defined by the second direction centerline Y, and continuously connected to the periapical flat region 251. The second edge flat region 254 is located on the side of the first window area 202 near the rear edge 274 and is defined by the rear edge 274. The second inter-window flat region 255 is located on the side of the first window area 202 near the first direction centerline X and is defined by the first direction centerline X, opposite to the second edge flat region 254. The peripheral flat region 251, the first inter-window flat region 253, the second edge flat region 254, the first edge flat region 252, and the second inter-window flat region 255 are continuously connected, separating the first window area 202 from the hole 201, adjacent window areas, and adjacent fin units.

[0029] Figures 3A to 3B Show Figure 2B The overall structure of the first region 242 of the fin unit 210 shown is illustrated, showing the area and shape design of the flat area 212 and the first window area 202 of the first region 242. Figure 3A An enlarged view of the first region 242 is shown. Figure 3B An enlarged view of the first window area 202 in the first region 242 is shown.

[0030] refer to Figure 3A The configuration of the first region 242 of the fin unit 210 is described. It should be understood that the configuration of the other three regions of the fin unit 210 is the same as that of the first region 242. For example... Figure 3A As shown, the first region 242 is defined by the first direction centerline X, the right edge 275, the second direction centerline Y, and the rear edge 274. The distance from the rear edge 274 to the first direction centerline X is V0, and the distance from the right edge 275 to the second direction centerline Y is H0. V0 is half of the center-to-center distance P1 between the center points of the fin units 210 in adjacent rows, and H0 is half of the center-to-center distance Pt between the center points of two adjacent fin units 210 in the same row.

[0031] The first window area 202 in the first region 242 is defined by a first boundary 331, a second boundary 332, a third boundary 333, a fourth boundary 334, and a fifth boundary 335. The first boundary 331 is located on the side of the first window area 202 facing the hole 201, forming the boundary between the first window area 202 and the flat area around the hole 251. The second boundary 332 is located on the side of the first window area 202 away from the hole 201, forming the boundary between the first window area 202 and the first edge flat area 252. The third boundary 333 forms the boundary between the first window area 202 and the second edge flat area 254. The fourth boundary 334 forms the boundary between the first window area 202 and the second inter-window flat area 255. The fifth boundary 335 forms the boundary between the first window area 202 and the first inter-window flat area 253.

[0032] The first boundary 331 is an arc structure, and its center is offset from the center of the hole 201, thus being a certain distance apart. The radius of the first boundary 331 is R1, which is determined by the inner radius R of the hole 201 (i.e., the radius of the heat exchange tube 191). In some embodiments, R1 / R is 2.308~4.231. The first boundary 331 includes a first endpoint 341 and a second endpoint 342, connecting to the fifth boundary 335 at the first endpoint 341 and to the fourth boundary 334 at the second endpoint 342. The distance from the first endpoint 341 to the second direction centerline Y is H1, and the distance from the second endpoint 342 to the second direction centerline Y is H2. H1 and H2 are determined by the distance H0 from the right edge 275 to the second direction centerline Y. In some embodiments, H1 / H0 is 0.0686~0.1486, and H2 / H0 is 0.514~0.571. The distance from the first endpoint 341 to the center line of the first direction is V1, and the distance from the second endpoint 342 to the center line X of the first direction is V2. V1 and V2 are determined by the positions of the window panes and seams on the window opening area 202.

[0033] The second boundary 332 includes a first segment 332a and a second segment 332b that are interconnected. The first segment 332a is connected to the third boundary 333, and the second segment 332b is connected to the fourth boundary 334. The first segment 332a is also an arc structure, with its center a certain distance away from the center of the hole 201. The radius of the first segment 332a is R2, which is determined by the inner radius R of the hole 201 (i.e., the radius of the heat exchange tube 191). In some embodiments, R2 / R is 2.115~3.077. The second segment 332b is approximately parallel to the second direction centerline Y. The second boundary 332 includes a third endpoint 343, a fourth endpoint 344, and a connection point 345. The second boundary 332 is connected to the third boundary 333 at the third endpoint 343 and to the fourth boundary 334 at the fourth endpoint 344, and the first segment 332a and the second segment 332b of the second boundary 332 are connected to each other at the connection point 345. The distance from the fourth endpoint 344 to the second direction centerline Y is H3, and H3 is determined by the distance H0 from the right edge 275 to the second direction centerline Y. In some embodiments, H3 / H0 is 0.891~0.937. The distance from the connection point 345 to the first direction centerline X is V3, and the distance to the third endpoint 343 is V4. The distance from the center of the first segment 332a to the first direction centerline X is also V3. V3 and V4 are determined by the positions of the window panes and seams on the window opening area 202.

[0034] The third boundary 333 and the fourth boundary 334 extend substantially parallel to the first direction centerline X, with the third boundary 333 being farther away from the first direction centerline X than the fourth boundary 334. The fifth boundary 335 extends substantially parallel to the second direction centerline Y. The third boundary 333 connects the first segment 332a of the second boundary 332 with the fifth boundary 335, and the fourth boundary 334 connects the second segment 332b of the second boundary 332 with the first boundary 331. The fifth boundary 335 connects the first boundary 331 and the third boundary 333.

[0035] refer to Figure 3B This describes the window panel arrangement of the first window area 202 within the first region 242. It should be understood that the window panel arrangements in the window areas of the other three regions are the same as those in the first window area 202. For example... Figure 3BAs shown, the first window 261, the second window 262, the third window 263, and the fourth window 264 are distributed along a direction parallel to the second direction centerline Y, and each extends parallel to the first direction centerline X. The first window 261 is connected to the third boundary 333 through its first edge 261a, and the fourth window 264 is connected to the fourth boundary 334 through its fourth edge 264a. A first gap 381 is formed between the first window 261 and the second window 262, a second gap 382 is formed between the second window 262 and the third window 263, and a third gap 383 is formed between the third window 263 and the fourth window 264. The first gap 381, the second gap 382, ​​and the third gap 383 are distributed along a direction parallel to the second direction centerline Y, and each extends along the first direction centerline X. Figure 3B As shown, the first seam 381 extends from the first endpoint 341 of the first boundary 331 to the first segment 332a of the second boundary 332, the third seam 383 extends from the connection point 345 of the second boundary 332 to the first boundary 331, and the second seam 382 is located between the first seam 381 and the third seam 383. Therefore, the positions of the first window 261, the second window 262, the third window 263, and the fourth window 264, as well as the first seam 381, the second seam 382, ​​and the third seam 383 determine the distance V1 from the first endpoint 341 of the first boundary 331 to the first direction centerline X, the distance V2 from the second endpoint 342 of the first boundary 331 to the first direction centerline X, the distance V3 from the connection point 345 of the second boundary 332 to the first direction centerline X and the distance V4 from the center of the first segment 332a of the second boundary 332 to the first direction centerline X, and the distance V4 from the connection point 345 of the second boundary 332 to the third endpoint 343. Specifically, the distance from the first slit 381 to the first direction centerline X is V1, the distance from the fourth edge 264a of the fourth window 264 to the first direction centerline X is V2, the distance from the third slit 383 to the first direction centerline X is V3, and the distance from the first edge 261a of the first window 261 to the third slit 383 is V4.

[0036] For fin units 210 in the same row, as shown in the figures of this application, adjacent fin units 210 are connected by a first edge flat region 252. For two adjacent rows of fin units 210, the two rows of fin units 210 are staggered by approximately half a fin unit 210, such that the perforated flat region 251 and the first window flat region 253 of the fin units 210 in one row are aligned with the first edge flat region 252 of two adjacent fin units 210 in the other row. When the airflow passes through the fin 190, it first flows through the first edge flat region 252, the perforated flat region 251, and the first window flat region 253 in the first row of fin units 210, and then continuously flows through the first window flat region 253, the perforated flat region 251, and the first edge flat region 252 in the second row of fin units 210, without being blocked by the window area.

[0037] In the heat exchanger, when air flows across the surface of fin 190, the windows on fin 190 extend laterally to the direction of the airflow, thus obstructing the airflow and creating turbulence, thereby improving the heat exchange effect. However, at the same time, the presence of the windows also increases the pressure drop of the airflow in the heat exchanger. In addition, the airflow also generates a significant pressure drop around the heat exchange tubes. When air flows through the flat region 212 of fin 190, since there is no obstruction in the flat region 212, the airflow velocity is relatively high, and the pressure drop is very small. Although a higher airflow velocity can also improve the heat exchange effect, its impact on the heat exchange effect is less than the impact of the turbulent airflow caused by the windows. Based on the dual considerations of pressure drop and heat exchange performance, the area balance and shape design of the flat region 212 and the windowed regions 202, 203, 204, and 205 are crucial. This application achieves both good heat exchange performance and low airflow pressure drop when using the fins 190 by rationally designing the area and shape of the flat area 212 and the window areas 202, 203, 204, and 205 on the fins 190.

[0038] Figure 4A and Figure 4B Two fin designs different from those in this application are schematically shown. Figure 4A and Figure 4B The shape and area design of the flat and windowed areas of the fin unit in the latter are different from those of the fin unit 210 in this application. The following comparison uses... Figure 4A and Figure 4B The CFD analysis results for the finned heat exchanger shown differ from those for a heat exchanger using fins according to an embodiment of this application in terms of total heat transfer per unit length of coil, air resistance, and heat transfer per unit pump work. Comparative Example 1 below uses the finned heat exchanger according to an embodiment of this application. Figure 4A The heat exchanger with fins shown in Comparative Example 2 uses the method according to... Figure 4B The heat exchanger with the fins shown.

[0039] Table 1 below lists the structural dimensions of the heat exchangers in Comparative Examples 1 and 2 and the heat exchanger in the embodiment of this application. It should be noted that "fin height" in Table 1 refers to the dimension of the fin in the direction parallel to the first direction centerline X, and "fin width" refers to the dimension in the direction parallel to the second direction centerline Y. As shown in Table 1, the fins used in Comparative Examples 1 and 2 and the embodiment of this application have the same fin height (210 mm). Furthermore, in the embodiment of this application shown in Table 1, the fin parameters used are: H0 = 8.75 mm, H1 = 1.0 mm, H2 = 4.75 mm, H3 = 8.0 mm, V0 = 6.35 mm, V1 = 4.5 mm, V2 = 0.8 mm, V3 = 1.5 mm, V4 = 3.8 mm, R1 = 6.0 mm, and R2 = 7.0 mm. Table 2 below lists a comparison of the CFD analysis results for the heat exchangers in the embodiment of this application shown in Table 1 and those in Comparative Examples 1 and 2.

[0040] Table 1. Structural dimensions of the heat exchangers in the embodiments of this application and comparative examples 1 and 2. Table 2 Comparison of the embodiments of this application with Comparative Examples 1 and 2 As shown in Table 2, under different airflow velocities, the total heat transfer per unit length of coil and the heat transfer per unit pump work of the heat exchanger using the finned 190 of this application are both greater than those of Comparative Examples 1 and 2. Therefore, compared to Figure 4A and Figure 4B As shown in the diagram, the fins 190 of this application can bring better heat exchange efficiency to the heat exchanger. Furthermore, as shown in Table 2, the higher the airflow velocity, the better the total heat transfer per unit length of coil and the heat transfer per unit pump work compared to Comparative Examples 1 and 2 for heat exchangers using the fins 190 of this application. Therefore, compared to... Figure 4A and Figure 4B As shown in the diagram, the higher the airflow velocity, the greater the improvement in heat exchange efficiency of the heat exchanger due to the fin 190 of this application. Similarly, as shown in Table 2, the air resistance of the heat exchanger using the fin 190 of this application is lower than that of Comparative Example 1 and Comparative Example 2, and this difference becomes more pronounced with higher airflow velocities. Therefore, the design of the fin 190 of this application is beneficial for improving the heat exchange effect of the heat exchanger and reducing airflow pressure drop.

[0041] In summary, this application has made special designs on the boundary position and shape of the window area in the finned unit, and reasonably optimized the relative area of ​​the flat area 212 and the window areas 202, 203, 204 and 205, thereby improving the heat exchange performance of the heat exchanger while reducing the airflow pressure drop.

[0042] Although this application will be described with reference to the specific embodiments shown in the accompanying drawings, it should be understood that the fins of this application can have many variations without departing from the spirit, scope, and context of the teachings of this application. Those skilled in the art will also recognize that different ways of modifying the structural details of the embodiments disclosed in this application fall within the spirit and scope of this application and the claims.

Claims

1. A fin for a heat exchanger, characterized in that: the fin (190) comprises a plurality of fin units (210) arranged in a plurality of rows, and the fin units (210) in adjacent two rows are arranged staggeredly, each of the fin units (210) comprises: a first direction center line (X) and a second direction center line (Y) perpendicular to each other; a hole (201) with a center located at the intersection of the first direction center line (X) and the second direction center line (Y), and the hole (201) has an inner radius R; four windowed regions (202, 203, 204, 205), adjacent two of the four windowed regions (202, 203, 204, 205) are arranged mirroringly on both sides of the first direction center line (X) or the second direction center line (Y) between them; and a flat region (212) comprising a hole-adjacent flat region (251) provided between the hole (201) and each of the windowed regions (202, 203, 204, 205); wherein each of the windowed regions (202, 203, 204, 205) comprises a first boundary (331), a second boundary (332), a third boundary (333), a fourth boundary (334), and a fifth boundary (335), the first boundary (331) is located on a side of the corresponding windowed region (202, 203, 204, 205) facing the hole (201), constituting a boundary line between the corresponding windowed region (202, 203, 204, 205) and the hole-adjacent flat region (251), the second boundary (332) is located on a side of the corresponding windowed region (202, 203, 204, 205) facing away from the hole (201), the third boundary (333) and the fourth boundary (334) extend substantially parallel to the first direction center line (X) and the third boundary (333) is farther away from the first direction center line (X) than the fourth boundary (334), and the fifth boundary (335) connects the first boundary (331) and the third boundary (333); and wherein the first boundary (331) is a first circular arc different from the hole (201), and the fifth boundary (335) extends substantially parallel to the second direction center line (Y).

2. The fin for a heat exchanger according to claim 1, characterized in that: the second boundary (332) comprises a first segment (332a) and a second segment (332b) connected to each other, the first segment (332a) is connected to the third boundary (333), and the second segment (332b) is connected to the fourth boundary (334), wherein the first segment (332a) is a second circular arc different from the hole (201), and the second segment (332b) is substantially parallel to the second direction center line (Y).

3. The fin for a heat exchanger according to claim 2, characterized by the flat region (212) further comprises: A first inter-window flat area (253) is arranged between each of the windowed areas (202, 203, 204, 205) and the second direction center line (Y) and continuously connects with the hole peripheral flat area (251), and the fifth boundary (335) constitutes a boundary line between the corresponding windowed area (202, 203, 204, 205) and the first inter-window flat area (253).

4. The fin for a heat exchanger according to claim 3, characterized by Each of the fin units (210) comprises: opposite front and rear edges (272, 274) extending parallel to the first direction center line (X) and opposite left and right edges (273, 275) extending parallel to the second direction center line (Y); wherein the distance from the front edge (272) or the rear edge (274) to the first direction center line (X) is V0, and the distance from the left edge (273) or the right edge (275) to the second direction center line (Y) is H0, V0 is 1 / 2 of the center distance P1 of the fin units (210) in the adjacent row, and H0 is 1 / 2 of the center distance Pt of the fin units (210) in the same row.

5. The fin for a heat exchanger according to claim 4, wherein: the first boundary (331) comprises a first end point (341) and a second end point (342), and is connected with the fifth boundary (335) at the first end point (341) and connected with the fourth boundary (334) at the second end point (342); wherein the distance from the first end point (341) to the second direction center line (Y) is H1, the distance from the second end point (342) to the second direction center line (Y) is H2, and the first boundary (331) has a radius R1; and wherein H1 and H2 are determined by H0, and R1 is determined by R.

6. The fin for a heat exchanger according to claim 5, wherein: H1 / H0 is 0.0686-0.1486, H2 / H0 is 0.514-0.571, and R1 / R is 2.308-4.

231.

7. The fin for a heat exchanger according to claim 6, wherein: the second boundary (332) comprises a third end point (343), a fourth end point (344) and a connecting point (345), the second boundary (332) is connected with the third boundary (333) at the third end point (343) and connected with the fourth boundary (334) at the fourth end point (344), and the first segment (332a) and the second segment (332b) of the third boundary (333) are connected at the connecting point (345); wherein the distance from the fourth end point (344) to the second direction center line (Y) is H3, and the first segment (332a) of the second boundary (332) has a radius R2; and H3 is determined by H0, and R2 is determined by R.

8. The fin for heat exchanger according to claim 7, wherein: H3 / H0 is 0.891~0.937, and R2 / R is 2.115~3.

077.

9. The fin for heat exchanger according to claim 8, wherein: a plurality of window pieces (261, 262, 263, 264) are arranged in each of the four windowed areas (202, 203, 204, 205), and a plurality of slits (381, 382, 383) are formed between adjacent window pieces, the plurality of slits (381, 382, 383) being distributed along a direction parallel to the second direction center line (Y) and extending parallel to the first direction center line (X).

10. The fin for heat exchanger according to claim 9, wherein: a distance between a first end point (341) of the first boundary (331) and the first direction center line (X) is V1, and a distance between a second end point (342) of the first boundary (331) and the first direction center line (X) is V2; and a distance between a connection point (345) of the second boundary (332) and the first direction center line (X) is V3, a distance between a third end point (343) of the second boundary (332) and the first direction center line (X) is V4, and a distance between a center of a first segment (332a) of the second boundary (332) and the first direction center line (X) is also V3. wherein V1, V2, V3 and V4 are determined by positions of the plurality of window pieces (261, 262, 263, 264) and the plurality of slits (381, 382, 383).

11. The fin for heat exchanger according to claim 10, wherein: a first window piece (261), a second window piece (262), a third window piece (263) and a fourth window piece (264) are arranged in each of the four windowed areas (202, 203, 204, 205), the first window piece (261) is connected to the third boundary (333) by a first edge (261a) thereof, the fourth window piece (264) is connected to the fourth boundary (334) by a fourth edge (264a) thereof, and a first slit (381) is formed between the first window piece (261) and the second window piece (262), a second slit (382) is formed between the second window piece (262) and the third window piece (263), and a third slit (383) is formed between the third window piece (263) and the fourth window piece (264); wherein a distance between the first slit (381) and the first direction center line (X) is V1, a distance between the fourth edge (264a) of the fourth window piece (264) and the first direction center line (X) is V2, a distance between the third slit (383) and the first direction center line (X) is V3, and a distance between the first edge (261a) of the first window piece (261) and the third slit (383) is V4.

12. The fin for a heat exchanger according to claim 11, characterized by the flat area (212) further comprises: a first edge flat area (252) located at one side of each of the windowed areas (202, 203, 204, 205) close to the left edge (273) or the right edge (275), the second boundary (332) constituting a demarcation line between each of the windowed areas (202, 203, 204, 205) and the first edge flat area (252); a second edge flat area (254) located at one side of each of the windowed areas (202, 203, 204, 205) close to the front edge (272) or the back edge (274), the third boundary (333) constituting a demarcation line between each of the windowed areas (202, 203, 204, 205) and the second edge flat area (254); and a second inter-window flat area (255) located at one side of each of the windowed areas (202, 203, 204, 205) close to the first direction central axis (X), the fourth boundary (334) constituting a demarcation line between each of the windowed areas (202, 203, 204, 205) and the second inter-window flat area (255).

13. The fin for heat exchangers according to claim 1, characterized in that: the inner radius R of the hole (201) is 2.6 mm.

14. A heat exchanger, characterized by comprising: a plurality of fins (190) according to any one of claims 1-13, said plurality of fins (190) being arranged in a stack spaced apart from each other.

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