Heat exchange fin, heat exchanger and water heater

Abstract

The utility model discloses a heat exchange fin, a heat exchanger and a water heater, and relates to the technical field of heat exchange equipment, and the heat exchange fin comprises a substrate and a flanging structure; the substrate is provided with a first surface, a second surface, a front end and a tail part, the first surface and the second surface are opposite, the front end and the tail part are opposite, and a plurality of mounting holes for mounting heat exchange tubes are formed in the first surface and are arranged in parallel in a single row; the turnup structure comprises a first turnup, the first turnup is arranged on the first surface and close to the tail portion, and one first turnup is arranged between every two adjacent mounting holes. According to the technical scheme, the flow speed of fluid outside the pipe is increased, the heat transfer performance can be improved, the flow resistance of the fluid outside the pipe can be reduced, and the comprehensive heat transfer performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange equipment, in particular to a heat exchange fin, a heat exchanger and a water heater. Background Art

[0002] The heat exchanger in a gas water heater is responsible for exchanging heat between high-temperature flue gas and water. The hot flue gas flows outside the tubes, exchanging heat with the water inside. During the heat transfer (heating or cooling) process, thermal resistance is primarily concentrated on the high-temperature flue gas or air side. To improve the heat transfer performance of the heat exchanger, fins are installed on the high-temperature flue gas or air side.

[0003] The surface structure of the heat exchange fins in the related art is complex, which improves the heat transfer performance but also increases the flow resistance of the fluid outside the tube, resulting in poor overall heat transfer performance. Utility Model Content

[0004] The main purpose of the utility model is to provide a heat exchange fin, a heat exchanger and a water heater, which are intended to increase the heat transfer performance and reduce the flow resistance of the fluid outside the tube, so as to enhance the comprehensive performance of heat transfer.

[0005] To achieve the above-mentioned purpose, the present invention provides a heat exchange fin, comprising:

[0006] The substrate has a first surface and a second surface opposite to each other, and a front end and a rear end opposite to each other, wherein the first surface is provided with a plurality of mounting holes for mounting heat exchange tubes, and the plurality of mounting holes are arranged in parallel and in a single row;

[0007] The flange structure includes a first flange, which is arranged on the first surface and close to the tail. The first flange is arranged between two adjacent mounting holes.

[0008] In one embodiment, the first surface is further provided with a plurality of first openings, and each of the first flanges is provided at least partially around a periphery of one of the first openings.

[0009] In one embodiment, the first opening is one of a circular hole, an elliptical hole, and a triangular hole.

[0010] In one embodiment, when the first opening is a circular hole, the diameter of the first opening is defined as D, which satisfies: 3 mm ≤ D ≤ 6 mm.

[0011] In one embodiment, the tail portion is provided with a plurality of recessed portions, and one recessed portion is provided between two adjacent mounting holes; the flange structure further comprises:

[0012] A second flange is provided on the edge of each of the inner recesses, and the second flange extends in a direction away from the second surface.

[0013] In one embodiment, the second flange includes a first folded edge and a second folded edge arranged at an angle, and the guiding surface of the first folded edge and the guiding surface of the second folded edge respectively face the two adjacent heat exchange tubes.

[0014] In one embodiment, the angle between the first folded edge and the second folded edge is defined as α, which satisfies: 90°≤α≤120°.

[0015] In one embodiment, the first surface is further provided with a second opening, and a second opening is provided between each of the mounting holes and the tail portion.

[0016] In one embodiment, the first surface is further provided with a third opening, the third opening is arranged close to the front end, and a third opening is provided between two adjacent mounting holes.

[0017] In one embodiment, the flange structure further includes:

[0018] The third flange is provided on the first surface and is arranged close to the tail portion. The third flange is provided on both sides of the substrate in the length direction.

[0019] In one embodiment, the first surface is further provided with a fourth opening, and the third flange is provided on a side edge of the fourth opening close to the mounting hole.

[0020] In one embodiment, the flange structure further includes:

[0021] The fourth flange is provided on the first surface and extends from the tail to the front end. The fourth flange is provided on both sides of the substrate in the length direction.

[0022] In one embodiment, the height of the flange structure is defined as h, which satisfies the following condition: 1.5 mm ≤ h ≤ 3 mm.

[0023] To achieve the above object, the present invention further provides a heat exchanger comprising:

[0024] multiple heat exchange tubes;

[0025] As for the above-mentioned heat exchange fins, each of the heat exchange tubes is passed through one of the mounting holes.

[0026] To achieve the above objectives, the present invention further provides a water heater comprising the above-mentioned heat exchanger.

[0027] The technical solution of the present invention is to provide a first flange on the first surface of the substrate, and to provide a first flange between any two adjacent mounting holes. The structural design is relatively simple. During the flow of fluids such as high-temperature flue gas or air, the simple structural design can reduce the flow resistance of the fluid outside the tube. The flow direction of the fluid is changed by the first flange to guide the fluid to the tube wall of the heat exchange tube, thereby increasing the flushing effect of the fluid on the tube wall of the heat exchange tube, thereby enhancing the heat transfer performance between the fluid and the tube wall of the heat exchange tube, achieving the purpose of both increasing the heat transfer performance and reducing the flow resistance of the fluid outside the tube, so as to enhance the comprehensive heat transfer performance.

[0028] In addition, by providing a single row of mounting holes on the heat exchange fins for installing a single row of heat exchange tubes, the volume and weight of the product itself can be reduced compared to a design with multiple rows of holes, so that the heat exchanger installed with the heat exchange fins has a smaller volume and weight while also having good heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0030] Figure 1 This is a schematic structural diagram of a heat exchange fin according to an embodiment of the present invention from a front view;

[0031] Figure 2 for Figure 1 Schematic diagram of part of the structure;

[0032] Figure 3 A partial structural front view of an embodiment of a heat exchange fin provided by the present utility model;

[0033] Figure 4 A schematic diagram of a portion of the structure of an embodiment of a heat exchange fin provided by the present invention from a back view;

[0034] Figure 5 This is a schematic structural diagram of another embodiment of the heat exchange fin provided by the present invention from a front view;

[0035] Figure 6 This is a schematic structural diagram of another embodiment of the heat exchange fin provided by the present invention from a front view;

[0036] Figure 7 This is a front view of an embodiment of a heat exchanger provided by the present utility model.

[0037] Description of Figure Numbers:

[0038]

[0039]

[0040] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0042] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0043] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] The heat exchanger in a gas water heater is responsible for exchanging heat between high-temperature flue gas and water. The hot flue gas flows outside the tubes, exchanging heat with the water inside. During the heat transfer (heating or cooling) process, thermal resistance is primarily concentrated on the high-temperature flue gas or air side. To improve the heat transfer performance of the heat exchanger, fins are installed on the high-temperature flue gas or air side.

[0045] The surface structure of the heat exchange fins in the related art is complex, which improves the heat transfer performance but also increases the flow resistance of the fluid outside the tube, resulting in poor overall heat transfer performance.

[0046] Based on the above problems, the present invention proposes a heat exchange fin 10, which is designed to both increase heat transfer performance and reduce the flow resistance of the fluid outside the tube, thereby enhancing the overall heat transfer performance. The heat exchange fin 10 is applied to a heat exchanger 100, which includes a heat exchange tube 20 and a heat exchange fin 10. Each heat exchange tube 20 is inserted into a mounting hole 111 of the heat exchange fin 10. When a fluid such as high-temperature flue gas or air flows outside the heat exchange tube 20, the first flange 12 can change the flow direction of the fluid to guide the fluid to the tube wall of the heat exchange tube 20, thereby increasing the scouring effect of the fluid on the tube wall of the heat exchange tube 20, thereby enhancing the heat transfer performance between the fluid and the tube wall of the heat exchange tube 20. The structure of the heat exchange fin 10 will be described below in the form of an embodiment.

[0047] See also Figures 1 to 6 In one embodiment of the present invention, the heat exchange fin 10 includes a base plate 11 and a first flange 12; the base plate 11 has a first surface 11a and a second surface 11b opposite to each other, and a front end 11c and a rear end 11d opposite to each other. The first surface 11a is provided with a plurality of mounting holes 111 for mounting the heat exchange tube 20, and the plurality of mounting holes 111 are arranged in parallel and in a single row; the first flange 12 is provided on the first surface 11a and is provided close to the rear end 11d, and a first flange 12 is provided between two adjacent mounting holes 111.

[0048] It is understood that the substrate 11 can be an elongated sheet structure, with the first surface 11a and the second surface 11b of the substrate 11 being the front and back sides of the substrate 11, respectively. The front end 11c and the rear end 11d of the substrate 11 can be the lower edge and the upper edge of the substrate 11, respectively. The first flange 12 is provided on the first surface 11a of the substrate 11 and extends toward the flow direction of the fluid. During the flow of the fluid, the first flange 12 can effectively change the flow direction of the fluid, and can also generate secondary eddies in the fluid, thereby enhancing boundary layer disturbances and promoting mixing of the cold and hot fluids, thereby further thinning the boundary layer near the outside of the tube. Furthermore, the velocity of the fluid outside the tube is increased, and the flushing effect of the fluid on the tube wall is strengthened, thereby enhancing heat transfer.

[0049] In one embodiment, the thickness of the substrate 11 can be controlled between 0.1 mm and 0.5 mm, specifically 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc. This can ensure the heat transfer effect between the heat exchange fins 10 and the fluid, while avoiding the excessive volume and weight of the heat exchange fins 10.

[0050] In this embodiment, the heat exchange fin 10 can be provided with three or more heat dissipation holes arranged in parallel, so that the heat exchange fin 10 is penetrated by three or more heat exchange tubes 20 to ensure that there is enough fluid to exchange heat after flowing through the inside of the heat exchange tube 20, thereby improving the heat exchange efficiency of the fluid.

[0051] In actual application, the shape of the heat exchange tube 20 passing through the heat exchange fin 10 can be an elliptical tube, a flat tube or other shapes, which can be determined according to the actual usage. Correspondingly, the shape of the mounting hole 111 can match the shape of the heat exchange tube 20.

[0052] In one embodiment, after the heat exchange tube 20 is inserted into the mounting hole 111, in order to increase the connection area between the heat exchange tube 20 and the heat exchange fin 10, an arc-shaped rib can be provided on the periphery of the mounting hole 111 in a direction away from the second surface 11b, so that the arc-shaped rib contacts the outer tube wall of the heat exchange tube 20 to form a connection area. The connection area can be used to fill solder or glue or other materials or structures.

[0053] In practical applications, the first flange 12 can be integrally formed with the substrate 11, or can be a separate structure from the substrate 11 and connected to the first surface 11a of the substrate 11 by bonding, plugging, or snapping. Of course, in order to improve the connection reliability between the first flange 12 and the substrate 11 and simplify the manufacturing process, the first flange 12 and the substrate 11 can be integrally formed.

[0054] In one embodiment, the angle between the first flange 12 and the base sheet 11 may be 90 degrees, so that the first flange 12 can better change the flow direction of the fluid to form a better turbulent effect.

[0055] In summary, the technical solution of the present invention is to provide a first flange 12 on the first surface 11a of the substrate 11, and to provide a first flange 12 between any two adjacent mounting holes 111. The structural design is relatively simple. During the flow of fluids such as high-temperature flue gas or air, the simple structural design can reduce the flow resistance of the fluid outside the tube. The flow direction of the fluid is changed by the first flange 12 to guide the fluid to the tube wall of the heat exchange tube 20, thereby increasing the flushing effect of the fluid on the tube wall of the heat exchange tube 20, thereby enhancing the heat transfer performance between the fluid and the tube wall of the heat exchange tube 20, achieving the purpose of both increasing the heat transfer performance and reducing the flow resistance of the fluid outside the tube, so as to enhance the comprehensive heat transfer performance.

[0056] In addition, by providing a single row of mounting holes 111 on the heat exchange fins 10 for installing a single row of heat exchange tubes 20, the volume and weight of the product itself can be reduced compared to a design with multiple rows of holes, so that the heat exchanger 100 installed with the heat exchange fins 10 has a smaller volume and weight while also having good heat exchange efficiency.

[0057] In addition, when assembling the heat exchange tube 20, a plurality of heat exchange fins 10 are arranged in the length direction of the heat exchange tube 20. Adjacent heat exchange fins 10 can be positioned and spaced apart from each other through a flange structure, so that a fluid channel is formed between any two adjacent heat exchange fins 10. Fluids such as high-temperature flue gas or air can flow through the fluid channel to exchange heat with the heat exchange fins 10 and the heat exchange tube 20.

[0058] See also Figure 1 、 Figure 2 In one embodiment of the present invention, the first surface 11 a further defines a plurality of first openings 112 , and each first flange 12 is disposed on at least a portion of a periphery of a first opening 112 .

[0059] In this configuration, the first openings 112 can act as a flow disruptor, thereby altering the normal flow of fluid between two adjacent heat exchange tubes 20 and better directing the fluid toward the walls of the heat exchange tubes 20. This increases the fluid's flushing effect on the walls of the heat exchange tubes 20, thereby enhancing the heat transfer performance between the fluid and the walls of the heat exchange tubes 20. Furthermore, the first openings 112 can reduce weight, reducing the volume and weight of the product itself, resulting in a heat exchanger 100 equipped with the heat exchange fins 10 having a smaller volume and weight.

[0060] In practical applications, the first flange 12 may be provided along the entire periphery of the first opening 112, or may be provided along a portion of the periphery of the first opening 112. In one embodiment, when the first opening 112 is a circular hole, the first flange 12 may be provided along the entire periphery of the first opening 112. In another embodiment, when the first opening 112 is a triangular hole, the first flange 12 may be provided along both side edges of the triangular hole near two adjacent heat exchange tubes 20.

[0061] In actual application, during the preparation process, the intensity of the fluid flushing the wall of the heat exchange tube 20 can be controlled by changing the size, position and shape of the first opening 112, thereby adjusting the heat exchange performance between the fluid and the heat exchange tube 20.

[0062] Further, see Figure 1 、 Figure 5 、 Figure 6 The first opening 112 can be a circular hole, an elliptical hole, or a triangular hole.

[0063] With such an arrangement, any one of the circular holes, elliptical holes, and triangular holes can play a better role in disturbing the flow, thereby changing the normal flow of the fluid in the area between two adjacent heat exchange tubes 20, better guiding the fluid to the tube wall of the heat exchange tube 20, and increasing the flushing effect of the fluid on the tube wall of the heat exchange tube 20, thereby enhancing the heat transfer performance between the fluid and the tube wall of the heat exchange tube 20.

[0064] In one embodiment, see Figure 1 The first opening 112 is a circular hole, and a first flange 12 may be provided around the periphery of the circular hole.

[0065] In another embodiment, see Figure 5 The first opening 112 is an elliptical hole, and a first flange 12 may be provided around the periphery of the elliptical hole.

[0066] In yet another embodiment, see Figure 6 The first opening 112 is a triangular hole, and first flanges 12 may be provided on two side edges of the triangular hole close to two adjacent heat exchange tubes 20 .

[0067] It should be noted that the diameter of the first opening 112 should not be too small or too large. If the diameter of the first opening 112 is too small, the distance between the first flange 12 and the heat exchange tube 20 will be too far. When the fluid flows through the first flange 12, most of the fluid cannot be directed to the wall of the heat exchange tube 20, thereby affecting the heat transfer performance between the fluid and the heat exchange tube 20. If the diameter of the first opening 112 is too large, the distance between the first opening 112 and the mounting hole 111 will be too close, making the connection between the first opening 112 and the mounting hole 111 relatively weak, resulting in the risk of deformation or even breakage of the heat exchange fin 10.

[0068] Based on this, see Figure 3 In one embodiment of the present invention, when the first opening 112 is a circular hole, the diameter of the first opening 112 is defined as D, and the following conditions are satisfied: 3 mm ≤ D ≤ 6 mm.

[0069] In this way, by controlling the diameter of the first opening 112 between 3 mm and 6 mm, it can be ensured that when the fluid flows through the first flange 12, most of the fluid is directed to the tube wall of the heat exchange tube 20, so as to improve the heat transfer performance between the fluid and the heat exchange tube 20, and at the same time reduce the risk of deformation or even breakage of the heat exchange fin 10.

[0070] As some exemplary examples, the diameter of the first opening 112 can be 3 mm, 3.5 mm, 3.8 mm, 4 mm, 4.5 mm, 4.8 mm, 5 mm, 5.5 mm, 5.8 mm, 6 mm, etc.

[0071] See also Figure 1 、 Figure 2 In one embodiment of the present invention, the tail portion 11d is provided with a plurality of recessed portions 113, and a recessed portion 113 is correspondingly provided between two adjacent mounting holes 111; the heat exchange fin 10 also includes a second flange 13, and a second flange 13 is provided on the edge of each recessed portion 113, and the second flange 13 extends in a direction away from the second surface 11b.

[0072] With this arrangement, the inner recess 113 can also act as a flow disruptor, altering the normal flow of the fluid in the tail region 11d, so that the second flange 13 can also direct the fluid to the wall of the heat exchange tube 20, increasing the fluid's flushing effect on the wall of the heat exchange tube 20, thereby enhancing the heat transfer performance between the fluid and the wall of the heat exchange tube 20. Furthermore, the second flange 13 can prevent the fluid from prematurely separating from the surface of the heat exchange fin 10, thereby extending the fluid's residence time on the surface of the heat exchange fin 10 and enhancing the turbulent heat transfer performance in the tail region 11d of the heat exchange fin 10, thereby improving the heat transfer performance between the fluid and the heat exchange fin 10. Furthermore, the inner recess 113 can also reduce weight, reducing the volume and weight of the product itself, resulting in a heat exchanger 100 equipped with the heat exchange fin 10 having a smaller volume and weight.

[0073] In practical applications, the second flange 13 can be integrally formed with the substrate 11, or can be a separate structure from the substrate 11 and connected to the first surface 11a of the substrate 11 by bonding, plugging, or snapping. Of course, in order to improve the connection reliability between the second flange 13 and the substrate 11 and simplify the manufacturing process, the second flange 13 and the substrate 11 can be integrally formed.

[0074] In one embodiment, the included angle between the second flange 13 and the substrate 11 may be 90 degrees, so that the second flange 13 can better change the flow direction of the fluid to form a better turbulent effect.

[0075] In practical applications, the second flange 13 can be an arc-shaped flange, a V-shaped flange, or a wavy flange.

[0076] Further, see Figure 2 The second flange 13 includes a first fold 131 and a second fold 132 set at an angle, and the guide surface of the first fold 131 and the guide surface of the second fold 132 respectively face the two adjacent heat exchange tubes 20, that is, the second flange 13 is a V-shaped flange.

[0077] This arrangement, by configuring the second flange 13 to have a first fold 131 and a second fold 132 arranged at an angle, can better redirect the fluid flowing around the second flange 13, allowing the fluid to continue flowing toward the wall of the heat exchange tube 20, flushing the wall of the heat exchange tube 20 and enhancing the heat exchange performance between the fluid and the heat exchange tube 20. Furthermore, the second flange 13 can also create a turbulent flow effect on the side of the heat exchange tube 20 near the tail portion 11d, thereby effectively regulating the turbulent heat exchange performance of the heat exchange tube 20 corresponding to the tail portion 11d, further enhancing the overall heat exchange performance between the fluid and the heat exchange tube 20.

[0078] In actual application, the angle between the first folded edge 131 and the second folded edge 132 can be determined according to actual usage conditions. By adjusting the angle between the first folded edge 131 and the second folded edge 132, the flow direction and flow speed of the fluid can be controlled, thereby adjusting the heat transfer performance between the fluid and the heat exchange tube 20. Specifically, the angle between the first folded edge 131 and the second folded edge 132 can be adjusted as needed during the preparation process.

[0079] It should be noted that the angle between the first fold 131 and the second fold 132 should not be too small or too large. If the angle between the first fold 131 and the second fold 132 is too small, when the fluid flows through the first fold 131 and the second fold 132, most of the fluid will be directed to the tail 11d of the substrate 11, while only a small part of the fluid will be directed to the wall of the heat exchange tube 20, thereby affecting the heat transfer performance between the fluid and the heat exchange tube 20; and if the angle between the first fold 131 and the second fold 132 is too large, when the fluid flows through the first fold 131 and the second fold 132, most of the fluid will be directed to the front end 11c of the substrate 11, while only a small part of the fluid will be directed to the wall of the heat exchange tube 20, thereby also affecting the heat transfer performance between the fluid and the heat exchange tube 20.

[0080] Based on this, see Figure 3 In one embodiment of the present invention, the angle between the first folded edge 131 and the second folded edge 132 is defined as α, which satisfies: 90°≤α≤120°.

[0081] In this way, by controlling the angle between the first fold edge 131 and the second fold edge 132 to be between 90° and 120°, it can be ensured that most of the fluid is directed to the tube wall of the heat exchange tube 20 when flowing through the first fold edge 131 and the second fold edge 132, thereby improving the heat transfer performance between the fluid and the heat exchange tube 20.

[0082] As some exemplary examples, the angle between the first folded edge 131 and the second folded edge 132 can be 90°, 95°, 100°, 105°, 110°, 115°, 120°, etc.

[0083] See also Figures 1 to 4 In one embodiment of the present invention, the first surface 11 a further defines a second opening 114 , and a second opening 114 is defined between each mounting hole 111 and the tail portion 11 d .

[0084] In this way, the second opening 114 can suppress the development of the vortex area corresponding to the tail 11d of the heat exchange tube 20, reduce the flow resistance of the fluid in the area corresponding to the tail 11d of the heat exchange tube 20, and enhance the heat transfer performance.

[0085] See also Figures 1 to 4 In one embodiment of the present invention, the first surface 11 a further defines a third opening 115 . The third opening 115 is disposed near the front end 11 c , and a third opening 115 is disposed between two adjacent mounting holes 111 .

[0086] In this manner, the third opening 115 can cause the secondary flow to disrupt the heat exchange and development of the flow boundary layer, thereby thinning the boundary layer and achieving the effect of enhancing fluid heat transfer.

[0087] See also Figures 1 to 4 In one embodiment of the present invention, the heat exchange fin 10 further includes a third flange 14 , which is provided on the first surface 11 a and close to the tail 11 d , and the third flange 14 is provided on both sides of the base sheet 11 in the length direction.

[0088] With such a configuration, on the one hand, the flow direction of the fluid can be changed through the third flange 14 to direct the fluid more toward the tube wall of the heat exchange tube 20, thereby increasing the flushing effect of the fluid on the tube wall of the heat exchange tube 20 and enhancing the heat exchange performance between the fluid and the heat exchange tube 20; on the other hand, the longitudinal vortex generated by the third flange 14 can effectively increase the velocity gradient near the heat exchange tube 20, thereby enhancing the convective heat transfer effect between the fluid and the heat exchange tube 20.

[0089] In practical applications, the third flange 14 can be integrally formed with the substrate 11, or can be a separate structure from the substrate 11 and connected to the first surface 11a of the substrate 11 by bonding, plugging, or snapping. Of course, in order to improve the connection reliability between the third flange 14 and the substrate 11 and simplify the manufacturing process, the third flange 14 and the substrate 11 can be integrally formed.

[0090] In one embodiment, the included angle between the third flange 14 and the substrate 11 may be 90 degrees, so that the third flange 14 can better change the flow direction of the fluid to form a better turbulent effect.

[0091] See also Figures 1 to 4In one embodiment of the present invention, the first surface 11 a further defines a fourth opening 116 , and the third flange 14 is disposed on an edge of the fourth opening 116 adjacent to the mounting hole 111 .

[0092] In this configuration, the fourth opening 116 also acts as a flow disruptor, altering the normal flow of the fluid and better directing the fluid toward the walls of the heat exchange tubes 20. This increases the fluid's flushing effect on the walls of the heat exchange tubes 20, thereby enhancing the heat transfer performance between the fluid and the walls of the heat exchange tubes 20. Furthermore, the fourth opening 116 also reduces weight, reducing the volume and weight of the product itself, resulting in a heat exchanger 100 equipped with the heat exchange fins 10 having a smaller volume and weight.

[0093] In practical applications, the fourth opening 116 may be a rectangular hole or a hole of other shapes, as long as the third flange 14 is disposed on an edge of the fourth opening 116 close to the mounting hole 111 .

[0094] See also Figure 2 In one embodiment of the present invention, the heat exchange fin 10 further includes a fourth flange 15, which is provided on the first surface 11a and extends from the tail 11d to the front end 11c. The fourth flange 15 is provided on both sides of the base sheet 11 in the length direction.

[0095] In this way, the setting of the fourth flange 15 can also prevent the fluid from leaving the surface of the heat exchange fin 10 too early, thereby prolonging the residence time of the fluid on the surface of the heat exchange fin 10, enhancing the turbulent heat transfer performance in the tail 11d area of ​​the heat exchange fin 10, and thus improving the heat transfer performance between the fluid and the heat exchange fin 10.

[0096] In addition, when assembling the heat exchange tube 20 , a plurality of heat exchange fins 10 are provided along the length direction of the heat exchange tube 20 , and adjacent heat exchange fins 10 can be positioned and spaced apart by the fourth flange 15 .

[0097] It should be noted that the height of the flange structure should not be too small or too large. If the flange structure is too small, the spacing between adjacent heat exchange fins 10 will be too small, and the fluid flowing through the fluid channel between two adjacent heat exchange fins 10 will have a significant impact on the flow resistance of the fluid, thereby affecting the heat transfer performance of the heat exchanger 100. If the flange structure is too high, the number of heat exchange fins 10 installed will be reduced, which will also affect the heat transfer performance of the heat exchanger 100.

[0098] See also Figure 2 In one embodiment of the present invention, the height of the flange structure is defined as h, which satisfies: 1.5 mm ≤ h ≤ 3 mm.

[0099] By controlling the height of the flange structure to between 1.5 mm and 3 mm, sufficient heat exchange fins 10 can be provided while reducing fluid flow resistance, thereby improving the heat transfer performance of the heat exchanger 100. Furthermore, the height of the flange structure can be adjusted based on the desired spacing between adjacent heat exchange fins 10, thereby regulating the macroscopic flow resistance during the heat transfer process.

[0100] As some examples, the height of the flange structure can be 1.5 mm, 1.8 mm, 2 mm, 2.1 mm, 2.3 mm, 2.5 mm, 2.8 mm, 3 mm, etc.

[0101] In this embodiment, the flange structure may include a first flange 12, a second flange 13, a third flange 14 and a fourth flange 15, wherein the heights of the first flange 12, the second flange 13, the third flange 14 and the fourth flange 15 may be the same or different.

[0102] See also Figure 7 The present invention also provides a heat exchanger 100 comprising a plurality of heat exchange tubes 20 and heat exchange fins 10. The specific structure of the heat exchange fins 10 is similar to that of the aforementioned embodiments. Since the present heat exchanger 100 utilizes all the technical solutions of all the aforementioned embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the aforementioned embodiments, and therefore will not be further detailed here. Each heat exchange tube 20 is inserted through a mounting hole 111 of the heat exchange fin 10.

[0103] In this embodiment, the heat exchanger 100 may include a plurality of heat exchange fins 10, which are arranged in sequence along the length of the heat exchange tube 20. Adjacent heat exchange fins 10 may be positioned relative to each other and spaced apart by a flange structure, so that a fluid channel is formed between any two adjacent heat exchange fins 10. Fluids such as high-temperature flue gas or air may flow through the fluid channel to exchange heat with the heat exchange fins 10 and the heat exchange tube 20. Furthermore, for two adjacent heat exchange tubes 20, a space for the flow of fluids such as high-temperature flue gas or air may be formed between the two adjacent heat exchange tubes 20, so that the fluid can fully exchange heat with the heat exchange tube 20, thereby improving heat transfer performance.

[0104] In order to demonstrate the superiority of the present invention, numerical simulation cases were set up for a fin with a common open hole structure and the heat exchange fin 10 of the present invention. The boundary conditions and overall dimensions of the simulation cases were the same.

[0105] Ansys Fluent was used to perform numerical calculations on the flow and heat transfer performance of the heat transfer fin 10 and the corresponding ordinary perforated fin. The calculation conditions were: fluid velocity 1.85 m / s, inlet temperature 1050 °C, steady-state, Realizable k-ε model, radiation DO model, and Coupled algorithm for pressure and velocity. For the momentum and energy equations, the diffusion term was calculated using the central difference format, and the convection term was calculated using the second-order upwind difference format. When the residuals of the continuity equation, momentum equation, and energy equation are all less than 10 -6 When , the numerical calculation is considered to have converged.

[0106] By extracting the inlet and outlet pressures and temperatures, the heat transfer capacity of the heat exchange fin 10 and the convective heat transfer coefficient on the surface of the heat exchange fin 10 can be calculated. The calculation results show that compared with conventional open-pore fins, the heat exchange fin 10 of the present invention has a 4.6% increase in convective heat transfer coefficient and a 1.8% increase in heat transfer capacity, significantly improving heat exchange performance.

[0107] The present invention also proposes a water heater, which includes a heat exchanger 100. The specific structure of the heat exchanger 100 refers to the above embodiment. Since the water heater adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0108] In this embodiment, the water heater may also include a shell, a burner and a combustion chamber. The burner and the heat exchanger 100 are both arranged in the shell. The burner is used to burn gas to generate high-temperature flue gas in the combustion chamber. The high-temperature flue gas flows into the heat exchanger 100 and exchanges heat with the water in the heat exchange tube 20 of the heat exchanger 100 to heat the water flowing through the heat exchange tube 20.

[0109] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A heat exchange fin, characterized in that: include: The substrate has a first surface and a second surface opposite to each other, and a front end and a rear end opposite to each other, wherein the first surface is provided with a plurality of mounting holes for mounting heat exchange tubes, and the plurality of mounting holes are arranged in parallel and in a single row; The flange structure includes a first flange, which is arranged on the first surface and close to the tail. The first flange is arranged between two adjacent mounting holes.

2. The heat exchange fin according to claim 1, characterized in that: The first surface is further provided with a plurality of first openings, and each of the first flanges is provided at least partially around a periphery of one of the first openings.

3. The heat exchange fin according to claim 2, characterized in that: The first opening is one of a circular hole, an elliptical hole, and a triangular hole.

4. The heat exchange fin according to claim 3, characterized in that: When the first opening is a circular hole, the diameter of the first opening is defined as D, and the following condition is satisfied: 3 mm ≤ D ≤ 6 mm.

5. The heat exchange fin according to any one of claims 1 to 4, characterized in that: The tail portion is provided with a plurality of recessed portions, and one recessed portion is provided between two adjacent mounting holes; the flange structure further comprises: A second flange is provided on the edge of each of the inner recesses, and the second flange extends in a direction away from the second surface.

6. The heat exchange fin according to claim 5, characterized in that: The second flange includes a first folded edge and a second folded edge arranged at an angle, and the guiding surface of the first folded edge and the guiding surface of the second folded edge respectively face the two adjacent heat exchange tubes.

7. The heat exchange fin according to claim 6, characterized in that: The angle between the first folded edge and the second folded edge is defined as α, which satisfies: 90°≤α≤120°.

8. The heat exchange fin according to any one of claims 1 to 4, characterized in that: The first surface is further provided with a second opening, and a second opening is provided between each of the mounting holes and the tail portion.

9. The heat exchange fin according to any one of claims 1 to 4, characterized in that: The first surface is further provided with a third opening, the third opening is arranged close to the front end, and a third opening is arranged between two adjacent mounting holes.

10. The heat exchange fin according to any one of claims 1 to 4, characterized in that: The flanging structure further includes: The third flange is provided on the first surface and is arranged close to the tail portion. The third flange is provided on both sides of the substrate in the length direction.

11. The heat exchange fin according to claim 10, wherein: The first surface is further provided with a fourth opening, and the third flange is provided on a side edge of the fourth opening close to the mounting hole.

12. The heat exchange fin according to any one of claims 1 to 4, characterized in that: The flanging structure further includes: The fourth flange is provided on the first surface and extends from the tail to the front end. The fourth flange is provided on both sides of the substrate in the length direction.

13. The heat exchange fin according to any one of claims 1 to 4, characterized in that: The height of the flange structure is defined as h, which satisfies the following conditions: 1.5 mm ≤ h ≤ 3 mm.

14. A heat exchanger, characterized in that: include: multiple heat exchange tubes; The heat exchange fin according to any one of claims 1 to 13, wherein each of the heat exchange tubes is passed through one of the mounting holes.

15. A water heater, characterized in that: Comprising the heat exchanger of claim 14.

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