Heat exchange fin, heat exchanger and water heater

Abstract

The utility model discloses a heat exchange fin, heat exchanger and water heater relates to heat exchange equipment technical field, and heat exchange fin includes base sheet and fume blocking structure, base sheet has heat exchange surface and opposite base sheet front end and base sheet tail, and heat exchange surface is equipped with a plurality of mounting holes for installing heat exchange pipe, a plurality of mounting holes are parallelly distributed along the first direction, and mounting hole has the center line along the first direction, and one middle part front section opening is equipped between the two adjacent mounting holes, and the horizontal line of the tail edge of middle part front section opening is located above the center line of mounting hole, and the distance between the edge line of two places of base sheet front end and the hole wall of mounting hole is equal, and fume blocking structure includes a plurality of first tail fume blocking structure, and one first tail fume blocking structure is equipped between the two adjacent mounting holes, and first tail fume blocking structure includes two first fume blocking flanging of angle, and respectively faces two adjacent heat exchange pipes. The scheme has improved the structure strength of heat exchange fin and heat exchange effect.

Description

Technical Field

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

[0002] The heat exchanger in a gas water heater is responsible for exchanging heat between high-temperature flue gas and water. The high-temperature flue gas flows outside the tubes, exchanging heat with the water inside. During heat transfer (heating or cooling), the thermal resistance is mainly concentrated on the high-temperature flue gas or air side. To improve the heat transfer performance of the heat exchanger, heat exchange fins are usually installed on the high-temperature flue gas or air side. However, the heat exchange fins in related technologies suffer from low structural strength and poor heat exchange efficiency. Utility Model Content

[0003] The main purpose of this utility model is to propose a heat exchange fin, a heat exchanger and a water heater, which aims to improve the structural strength and heat exchange effect of the heat exchange fin.

[0004] To achieve the above objectives, this utility model proposes a heat exchange fin, comprising:

[0005] A substrate has a heat exchange surface and opposing front and rear ends. The heat exchange surface has multiple mounting holes for mounting heat exchange tubes. The mounting holes are arranged side-by-side along a first direction and have a centerline along the first direction. The front end of the substrate has multiple central front openings, with one central front opening between two adjacent mounting holes. The horizontal line containing the trailing edge of the central front opening is located above the centerline of the mounting hole. The distance between any two edge lines at the front end of the substrate and the wall of the mounting hole is equal.

[0006] The smoke-blocking structure includes multiple first tail smoke-blocking structures, with one first tail smoke-blocking structure corresponding to each of two adjacent mounting holes. The first tail smoke-blocking structure is located near the tail of the substrate. The first tail smoke-blocking structure includes two first smoke-blocking flanges spaced apart along the first direction. The two first smoke-blocking flanges are arranged at an included angle and face the two adjacent heat exchange tubes respectively.

[0007] In one embodiment, the distance between the trailing edge of the central front opening and the center line of the mounting hole is defined as L, which satisfies the following condition: 0.5mm ≤ L ≤ 3mm.

[0008] In one embodiment, the distance between the trailing edge of the central front opening and the center line of the mounting hole is defined as L, which satisfies: L = 1.7 mm.

[0009] In one embodiment, the edge line of the front end of the substrate is an arc-shaped line, and the wall of the mounting hole is an arc-shaped wall.

[0010] In one embodiment, the smoke-blocking structure further includes a plurality of central smoke-blocking structures, with one central smoke-blocking structure provided between two adjacent mounting holes. The central smoke-blocking structure is located between the tail end of the substrate and the front end of the substrate, and is located below the central front opening.

[0011] The central smoke-blocking structure includes two central smoke-blocking flanges arranged at an angle, with the two central smoke-blocking flanges facing the two adjacent heat exchange tubes respectively.

[0012] In one embodiment, the maximum distance between the two central smoke-blocking flanges is defined as L1, and the minimum distance between two adjacent mounting holes is defined as L2, then L1≤L2.

[0013] In one embodiment, the maximum distance between the two first smoke-blocking flanges located below the same mounting hole is defined as L3, and the axial distance of the mounting hole along the center line is defined as L4, then L3 ≤ L4.

[0014] In one embodiment, the smoke-blocking structure further includes a second tail smoke-blocking structure. The substrate is provided with the second tail smoke-blocking structure on both sides in the first direction. The second tail smoke-blocking structure is disposed near the tail of the substrate. The second tail smoke-blocking structure faces the heat exchange tube adjacent to it.

[0015] In one embodiment, the substrate has a plurality of recesses at its tail end, and a corresponding recess is provided between two adjacent mounting holes; the smoke-blocking structure further includes:

[0016] The third tail smoke-blocking structure is provided at the edge of each of the concave portions. The third tail smoke-blocking structure includes two third smoke-blocking flanges arranged at an angle, with the two third smoke-blocking flanges facing the two adjacent heat exchange tubes respectively.

[0017] To achieve the above objectives, this utility model also proposes a heat exchanger, comprising:

[0018] Multiple heat exchange tubes;

[0019] As described above, each heat exchange tube passes through one of the mounting holes.

[0020] To achieve the above objectives, this utility model also proposes a water heater, including the heat exchanger described above.

[0021] The technical solution of this utility model involves setting a central front opening at the front end of the heat exchange fin substrate, with the central front opening positioned above the center line of the mounting hole. This ensures that the horizontal line containing the trailing edge of the central front opening is also above the center line of the mounting hole. This design extends the distance between the horizontal line containing the trailing edge of the central front opening and the tail of the substrate, ensuring sufficient width for the substrate corresponding to the central front opening, thereby effectively improving the structural strength of the heat exchange fin. Simultaneously, the sufficient width of the substrate corresponding to the central front opening increases the heat exchange area of ​​the heat exchange fin, thus effectively improving its heat exchange efficiency. Furthermore, by making the distance between any two edge lines at the front end of the substrate equal to the wall of the mounting hole, the fin height at all positions on the front end of the substrate is designed to be uniform, achieving an equal fin height design. This design improves the deformation resistance and heat exchange area of ​​the heat exchange fin, further enhancing its structural strength and heat exchange efficiency.

[0022] Furthermore, since high-temperature flue gas tends to be diverted when it reaches the tail of the substrate along the flow direction, the heat exchange efficiency of the tail region of the heat exchange tubes decreases. Therefore, this application adds a first tail smoke baffle structure between two adjacent mounting holes and near the tail of the substrate. When the high-temperature flue gas passes through the two first smoke baffle flanges of the first tail smoke baffle structure, the two first smoke baffle flanges can change the flow direction of the high-temperature flue gas, so that the high-temperature flue gas is guided to the tail of the two adjacent heat exchange tubes by the two first smoke baffle flanges respectively, so that the high-temperature flue gas is flushed towards the tail of the two adjacent heat exchange tubes, so that the high-temperature flue gas continues to flow around the heat exchange tubes, which enhances the heat transfer performance between the high-temperature flue gas and the tail of the heat exchange tubes, thereby improving the heat exchange efficiency between the high-temperature flue gas and the tail of the heat exchange tubes. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 A front view of an embodiment of the heat exchange fins provided by this utility model;

[0025] Figure 2 for Figure 1 A partial structural diagram.

[0026] Explanation of icon numbers:

[0027]

[0028]

[0029] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0031] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0033] The heat exchanger in a gas water heater is responsible for exchanging heat between high-temperature flue gas and water. The high-temperature flue gas flows outside the tubes, exchanging heat with the water inside. During heat transfer (heating or cooling), the thermal resistance is mainly concentrated on the high-temperature flue gas or air side. To improve the heat transfer performance of the heat exchanger, heat exchange fins are usually installed on the high-temperature flue gas or air side. However, the heat exchange fins in related technologies suffer from low structural strength and poor heat exchange efficiency.

[0034] To address the aforementioned problems, this invention proposes a heat exchange fin 100, aiming to improve the structural strength and heat exchange efficiency of the heat exchange fin 100. This heat exchange fin 100 is applied in a heat exchanger, which includes heat exchange tubes and heat exchange fins 100, with each heat exchange tube passing through a mounting hole 111 in the heat exchange fin 100. The structure of the heat exchange fin 100 will be described below by way of an embodiment.

[0035] Please see Figure 1 and Figure 2 In one embodiment of this utility model, the heat exchange fin 100 includes a substrate 10 and a smoke baffle structure 20; the substrate 10 has a heat exchange surface 11, and opposing front end 12 and rear end 13; the heat exchange surface 11 is provided with a plurality of mounting holes 111 for mounting heat exchange tubes; the plurality of mounting holes 111 are arranged side by side along a first direction a, and the mounting holes 111 have a centerline b along the first direction a; the front end 12 of the substrate is provided with a plurality of central front openings 121, and a central front opening 121 is provided between two adjacent mounting holes 111, and the tail edge of the central front opening 121 is... The horizontal line is located above the center line b of the mounting hole 111; the distance between the edge lines of any two points on the front end 12 of the substrate and the hole wall of the mounting hole 111 is equal; the smoke-blocking structure 20 includes a plurality of first tail smoke-blocking structures 22, and a first tail smoke-blocking structure 22 is provided between two adjacent mounting holes 111, and the first tail smoke-blocking structure 22 is set close to the tail end 13 of the substrate; the first tail smoke-blocking structure 22 includes two first smoke-blocking flanges 221 distributed at intervals along the first direction a, the two first smoke-blocking flanges 221 are set at an included angle and face the two adjacent heat exchange tubes respectively.

[0036] Understandably, the substrate 10 can be a long, strip-shaped structure extending along the first direction a, meaning the length direction of the substrate 10 is consistent with the first direction a. The heat exchange surface 11 of the substrate 10 can be either the front or back side of the substrate 10, and the front end 12 and rear end 13 of the substrate 10 can be the upper edge and lower edge of the substrate 10, respectively. High-temperature flue gas flows from the front end 12 to the rear end 13 of the heat exchange fin 100 to exchange heat with the heat exchange fin 100.

[0037] The central front opening 121 refers to the recessed design of the front end 12 of the substrate towards the rear end 13 of the substrate at the position between two adjacent mounting holes 111, so that the recessed position extends above the center line b of the mounting holes 111, thereby forming a central front opening 121 between two adjacent mounting holes 111.

[0038] It should be noted that the distance between the edge line of the front end 12 of the substrate and the wall of the mounting hole 111 is the fin height. Let X1 and X2 be the distances between any two edge lines of the front end 12 of the substrate and the wall of the mounting hole 111, respectively. Then, X1 = X2. For example, the distance X1 between the topmost edge line of the front end 12 of the substrate and the wall of the mounting hole 111 is equal to the distance X2 between the edge line of the front end 12 near the tail end 13 of the substrate and the wall of the mounting hole 111. The distance between the topmost edge line of the front end 12 of the substrate and the wall of the mounting hole 111 refers to the distance between the tangent of the topmost edge line of the front end 12 of the substrate and the tangent of the topmost wall of the mounting hole 111; the distance between the edge line of the front end 12 near the tail end 13 of the substrate and the wall of the mounting hole 111 refers to the distance between the tangent of the edge line of the front end 12 near the tail end 13 of the substrate and the tangent of the mounting hole 111 near the tail end 13 of the substrate.

[0039] The thickness of the substrate 10 should not be too large or too small. For example, it can be controlled between 0.1mm and 0.5mm, specifically 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc. This can ensure the heat transfer effect between the heat exchange fins 100 and the fluid, while avoiding excessive volume and weight of the heat exchange fins 100.

[0040] Multiple mounting holes 111 on the substrate 10 can be arranged in parallel along the first direction a and in a single row, so that multiple mounting holes 111 can be used to install a single row of heat exchange tubes. Compared with the design of opening multiple rows of holes, the size and weight of the product itself can be reduced, so that the heat exchanger with the heat exchange fins 100 installed has a smaller size and weight, while also having good heat exchange efficiency.

[0041] The substrate 10 may have three or more parallel mounting holes 111 so that the heat exchange fins 100 can be fitted with three or more heat exchange tubes, so as to ensure that enough fluid can exchange heat after flowing through the inside of the heat exchange tubes, thereby improving the heat exchange efficiency of the fluid.

[0042] In practical applications, the shape of the heat exchange tube inserted into the heat exchange fin 100 can be an elliptical tube, a flat tube, or other shapes, depending on the actual application. Correspondingly, the shape of the mounting hole 111 should match the shape of the heat exchange tube.

[0043] In one embodiment, after the heat exchange tube is inserted into the mounting hole 111, in order to increase the connection area between the heat exchange tube and the heat exchange fins 100, ribs can be provided around the mounting hole 111 so that the ribs contact the outer wall of the heat exchange tube to form a connection area. This connection area can be used to fill solder, or it can be used to fill adhesive or other materials or structures.

[0044] The smoke-blocking structure 20 refers to a structure capable of changing the direction of flue gas flow, such as a flange, baffle, or baffle strip. The smoke-blocking structure 20 can be integrally formed with the substrate 10, or it can be a separate structure connected to the heat exchange surface 11 of the substrate 10 using methods such as bonding, insertion, or snap-fit. Of course, to improve the reliability of the connection between the smoke-blocking structure 20 and the substrate 10, and to simplify the manufacturing process, the smoke-blocking structure 20 and the substrate 10 can be integrally formed.

[0045] In summary, the technical solution of this utility model provides a central front opening 121 at the front end 12 of the substrate of the heat exchange fin 100, and positions the central front opening 121 above the center line b of the mounting hole 111. This design extends the distance between the horizontal line of the trailing edge of the central front opening 121 and the tail end 13 of the substrate, ensuring that the substrate 10 has sufficient width corresponding to the central front opening 121, thereby effectively improving the structural strength of the heat exchange fin 100. Simultaneously, the sufficient width of the substrate 10 corresponding to the central front opening 121 increases the heat exchange area of ​​the heat exchange fin 100, thus effectively improving the heat exchange effect of the heat exchange fin 100. Furthermore, by making the distance between the edge line of any two points on the front end 12 of the substrate equal to the distance between the hole wall of the mounting hole 111, it is equivalent to designing the fin height of the front end 12 of the substrate at each position to be uniform, so as to achieve the equal fin height design. This design can improve the deformation resistance and heat exchange area of ​​the heat exchange fin 100, thereby further improving the structural strength and heat exchange effect of the heat exchange fin 100.

[0046] Furthermore, since high-temperature flue gas tends to be diverted when it reaches the tail 13 of the substrate along the flow direction, the heat exchange efficiency of the tail region of the heat exchange tube decreases. Therefore, this application adds a first tail smoke baffle structure 22 between two adjacent mounting holes 111 and near the tail 13 of the substrate. When the high-temperature flue gas passes through the two first smoke baffle flanges 221 of the first tail smoke baffle structure 22, the two first smoke baffle flanges 221 can change the flow direction of the high-temperature flue gas, so that the high-temperature flue gas is guided to the tail of the two adjacent heat exchange tubes by the two first smoke baffle flanges 221 respectively, so that the high-temperature flue gas is flushed towards the tail of the two adjacent heat exchange tubes, so that the high-temperature flue gas continues to flow around the heat exchange tubes, which enhances the heat transfer performance between the high-temperature flue gas and the tail of the heat exchange tubes, thereby improving the heat exchange efficiency between the high-temperature flue gas and the tail of the heat exchange tubes.

[0047] The design of the first tail smoke baffle structure 22 can also generate vortices in the high-temperature flue gas, strengthen boundary layer disturbance, and promote the mixing of hot and cold flue gas, so as to further thin the boundary layer near the outside of the heat exchange tube. At the same time, it also increases the velocity of the flue gas outside the heat exchange tube, strengthens the scouring effect of the flue gas on the heat exchange tube wall, and plays a role in enhancing heat transfer.

[0048] When assembling the heat exchange tube, multiple heat exchange fins 100 are arranged along the length of the heat exchange tube. Adjacent heat exchange fins 100 can be positioned and spaced apart by the smoke baffle structure 20 so that a fluid channel is formed between any two adjacent heat exchange fins 100. High-temperature flue gas or air and other fluids can flow through the fluid channel to exchange heat with the heat exchange fins 100 and the heat exchange tube.

[0049] Please see Figure 2 In one embodiment of this utility model, the distance between the tail edge of the front opening 121 and the center line b of the mounting hole 111 is defined as L, which satisfies: 0.5mm≤L≤3mm.

[0050] With this configuration, if the distance L between the trailing edge of the central front opening 121 and the center line b of the mounting hole 111 is too small, the distance between the horizontal line where the trailing edge of the central front opening 121 is located and the tail 13 of the substrate will be shortened, and it cannot be guaranteed that the substrate 10 has sufficient width corresponding to the position of the central front opening 121. If the distance L between the trailing edge of the central front opening 121 and the center line b of the mounting hole 111 is too large, although it can sufficiently extend the distance between the horizontal line where the trailing edge of the central front opening 121 is located and the tail 13 of the substrate, it will lead to an increase in material costs and an increase in the probability of high-temperature vaporization of the heat exchange fins 100 at the position between two adjacent mounting holes 111. Therefore, by controlling the distance L between the trailing edge of the front opening 121 and the center line b of the mounting hole 111 to between 0.5mm and 3mm, this application can effectively improve the structural strength and heat exchange effect of the heat exchange fins 100, while reducing material costs and the probability of high-temperature vaporization of the heat exchange fins 100 at the position between two adjacent mounting holes 111.

[0051] As some examples, the distance L between the trailing edge of the front opening 121 and the center line b of the mounting hole 111 can be 0.5mm, 0.5mm, 0.7mm, 0.8mm, 1mm, 1.2mm, 1.6mm, 1.7mm, 1.9mm, 2mm, 2.1mm, 2.3mm, 2.5mm, 2.8mm, 3mm, etc.

[0052] Furthermore, if the distance between the trailing edge of the opening 121 in the middle section and the center line b of the mounting hole 111 is defined as L, then L = 1.7 mm. This design can effectively improve the structural strength and heat exchange effect of the heat exchange fins 100, while reducing material costs and the probability of high-temperature vaporization of the heat exchange fins 100 at the position between two adjacent mounting holes 111.

[0053] Please see Figure 1 and Figure 2 In one embodiment of this utility model, the edge line of the front end 12 of the substrate is an arc-shaped line, and the wall of the mounting hole 111 is an arc-shaped wall.

[0054] With this configuration, by designing the edge line of the front end 12 of the substrate and the wall of the mounting hole 111 as arc-shaped, the fin height of the front end 12 of the substrate can be varied more evenly, and the heat can be transferred more evenly to the tail of the heat exchange tube, further making the heat transfer in the heat exchange tube more uniform.

[0055] Please see Figure 1 and Figure 2 In one embodiment of the present invention, the smoke-blocking structure 20 includes a plurality of central smoke-blocking structures 21. A central smoke-blocking structure 21 is provided between two adjacent mounting holes 111. The central smoke-blocking structure 21 is located between the tail end 13 and the front end 12 of the substrate and is located below the central front opening 121. The central smoke-blocking structure 21 includes two central smoke-blocking flanges 211 arranged at an angle, and the two central smoke-blocking flanges 211 face two adjacent heat exchange tubes respectively.

[0056] With this configuration, a central smoke-blocking structure 21 is provided between any two adjacent mounting holes 111. When the high-temperature flue gas flows through the central smoke-blocking structure 21 along the flow direction, it can flow towards the two central smoke-blocking flanges 211 of the central smoke-blocking structure 21. The two central smoke-blocking flanges 211 can change the flow direction of the high-temperature flue gas, so that the high-temperature flue gas is guided to the two adjacent heat exchange tubes respectively through the two central smoke-blocking flanges 211. This causes the high-temperature flue gas to scour towards the two adjacent heat exchange tubes, which enhances the heat transfer performance between the high-temperature flue gas and the tube wall of the heat exchange tube, thereby improving the heat exchange efficiency between the high-temperature flue gas and the heat exchange tube. At the same time, the design of the central smoke-blocking structure 21 can also reduce the flow resistance of the high-temperature flue gas outside the heat exchange tube, thereby further enhancing the heat exchange efficiency between the high-temperature flue gas and the heat exchange tube.

[0057] In addition, the design of the central smoke baffle structure 21 can also generate vortices in the high-temperature flue gas, strengthen the boundary layer disturbance, and promote the mixing of hot and cold flue gas, so as to further thin the boundary layer near the outside of the heat exchange tube. At the same time, it also increases the velocity of the flue gas outside the heat exchange tube, strengthens the scouring effect of the flue gas on the heat exchange tube wall, and plays a role in enhancing heat transfer.

[0058] In some embodiments, the angle between the central smoke-blocking flange 211 and the substrate 10 can be 90 degrees, so that the central smoke-blocking flange 211 can better change the flow direction of high-temperature flue gas, thereby forming a better guiding and turbulence effect.

[0059] Please see Figure 2 In one embodiment of this utility model, the maximum distance between the two central smoke-blocking flanges 211 is defined as L1, and the minimum distance between two adjacent mounting holes 111 is defined as L2, which satisfies: L1≤L2.

[0060] With this configuration, when the maximum distance L1 between the two central smoke-blocking flanges 211 is greater than the distance L1 between the two adjacent mounting holes 111, a large portion of the high-temperature flue gas will flow directly from the two sides of the central smoke-blocking flanges 211 that are far apart from each other to the substrate tail 13 of the substrate 10. This results in the two central smoke-blocking flanges 211 being unable to guide more high-temperature flue gas to the two adjacent heat exchange tubes. Therefore, by making the maximum distance L1 between the two central smoke-blocking flanges 211 less than or equal to the distance L1 between the two adjacent mounting holes 111, this application can fully change the flow direction of the high-temperature flue gas, so as to guide more high-temperature flue gas to the tube wall of the heat exchange tube, so that more high-temperature flue gas will scour towards the heat exchange tube, thereby enhancing the heat transfer performance between the high-temperature flue gas and the tube wall of the heat exchange tube, and thus effectively improving the heat exchange efficiency between the high-temperature flue gas and the heat exchange tube.

[0061] It should be noted that the maximum distance between the two central smoke-blocking flanges 211 refers to the maximum distance between the two central smoke-blocking flanges 211 in the first direction a. Similarly, the minimum distance between two adjacent mounting holes 111 refers to the minimum distance between two adjacent mounting holes 111 in the first direction a.

[0062] Please see Figure 1 In one embodiment of the present invention, the heat exchange surface 11 is provided with a plurality of first openings 112, and a first opening 112 is provided between two adjacent mounting holes 111, and two central smoke-blocking flanges 211 are respectively provided on the two sides of the first opening 112.

[0063] This design allows the first opening 112 to act as a turbulence breaker, altering the normal flow of high-temperature flue gas between adjacent heat exchange tubes. This better directs the high-temperature flue gas towards the tube wall, increasing its scouring effect and thus enhancing heat transfer performance between the flue gas and the tube wall. Furthermore, the first opening 112 reduces weight, resulting in a lighter heat exchanger with the heat exchange fins 100.

[0064] In practical applications, the first opening 112 can be a triangular hole, a prismatic hole, or other shapes. During the manufacturing process, the intensity of the high-temperature flue gas scouring the heat exchange tube wall can be controlled by changing the size, position, and shape of the first opening 112, thereby adjusting the heat exchange capacity between the high-temperature flue gas and the heat exchange tube.

[0065] Please see Figure 2 In one embodiment of this utility model, the maximum distance between the two first smoke-blocking flanges 221 located below the same mounting hole 111 is defined as L3, and the axial distance of the mounting hole 111 along the center line bb is defined as L4, then L3≤L4 is satisfied.

[0066] With this configuration, when the maximum distance L3 between the two first smoke-blocking flanges 221 located below the same mounting hole 111 is greater than the axial distance L4 of the mounting hole 111 along the center line b, a large portion of the high-temperature flue gas flowing through the two first smoke-blocking flanges 221 located below the same mounting hole 111 will flow from the two sides of the two first smoke-blocking flanges 221 that are far apart from each other to the sides of the heat exchange tube. This results in the two first smoke-blocking flanges 221 being unable to guide more high-temperature flue gas to the tail of the heat exchange tube. Therefore, by making the maximum distance L3 between the two first smoke-blocking flanges 221 located below the same mounting hole 111 less than or equal to the axial distance L4 of the mounting hole 111 along the center line b, this application can fully change the flow direction of the high-temperature flue gas, so as to guide more high-temperature flue gas to the tail of the heat exchange tube, so that more high-temperature flue gas will be flushed towards the tail of the heat exchange tube, thereby enhancing the heat transfer performance between the high-temperature flue gas and the tail of the heat exchange tube, and thus effectively improving the heat exchange efficiency between the high-temperature flue gas and the tail of the heat exchange tube.

[0067] It should be noted that in two adjacent first tail smoke-blocking structures 22, one first smoke-blocking flange 221 of one first tail smoke-blocking structure 22 and one first smoke-blocking flange 221 of the other first tail smoke-blocking structure 22 are close to each other, and the two first smoke-blocking flanges 221 are located below the same mounting hole 111. The maximum distance between the two first smoke-blocking flanges 221 refers to the maximum distance between the two first smoke-blocking flanges 221 in the first direction a.

[0068] Please see Figure 1 In one embodiment of the present invention, the heat exchange surface 11 is further provided with a plurality of second openings 113, and a second opening 113 is provided between two adjacent mounting holes 111. The second opening 113 includes two sub-openings 113a distributed at intervals along the first direction a, and two first smoke-blocking flanges 221 are respectively provided on the edges of the two sub-openings 113a.

[0069] This configuration, by placing the two first smoke-blocking flanges 221 at the edges of the two sub-openings 113a of the second opening 113, creates turbulence at the two sub-openings 113a when the high-temperature flue gas flows through the two first smoke-blocking flanges 221. This alters the normal flow of the high-temperature flue gas in the region between the heat exchange tube and the tail 13 of the substrate, better guiding the high-temperature flue gas to the tail of the heat exchange tube and increasing the scouring effect of the high-temperature flue gas on the tail of the heat exchange tube, thereby enhancing the heat transfer performance between the high-temperature flue gas and the tail of the heat exchange tube. Furthermore, the second opening 113 also reduces weight, resulting in a lighter heat exchanger with the heat exchange fins 100 installed.

[0070] In practical applications, the sub-aperture 113a can be an opening of various shapes, such as a triangular hole, a prismatic hole, or a rectangular hole. During the manufacturing process, the intensity of the high-temperature flue gas scouring the tail of the heat exchange tube can be controlled by changing the size, position, and shape of the sub-aperture 113a, thereby adjusting the heat exchange capacity between the high-temperature flue gas and the heat exchange tube.

[0071] Please see Figure 1 In one embodiment of the present invention, the smoke-blocking structure 20 further includes a second tail smoke-blocking structure 23. The substrate 10 is provided with the second tail smoke-blocking structure 23 on both sides in the first direction a. The second tail smoke-blocking structure 23 is disposed close to the tail 13 of the substrate. The second tail smoke-blocking structure 23 faces the heat exchange tube adjacent to it.

[0072] With this configuration, when the high-temperature flue gas flows through the tail end of the heat exchange tubes near both sides of the substrate 10, it will flow towards the second tail smoke baffle structure 23. The second tail smoke baffle structure 23 can change the flow direction of the high-temperature flue gas, which can prolong the diversion time of the high-temperature flue gas at the adjacent heat exchange tube, thereby improving the heat exchange efficiency between the high-temperature flue gas and the heat exchange tubes near both sides of the substrate 10.

[0073] In addition, the design of the second tail smoke baffle structure 23 can also generate longitudinal vortices in the high-temperature flue gas, strengthen boundary layer disturbance, and promote the mixing of hot and cold flue gas, so as to further thin the boundary layer near the outside of the heat exchange tube. At the same time, it also increases the velocity of the flue gas outside the heat exchange tube, strengthens the scouring effect of the flue gas on the tube wall of the heat exchange tube, and plays a role in enhancing heat transfer.

[0074] In some embodiments, the angle between the second tail smoke-blocking structure 23 and the substrate 10 can be 90 degrees, so that the second tail smoke-blocking structure 23 can better change the flow direction of the high-temperature flue gas, thereby forming a better guiding and turbulence effect.

[0075] Please see Figure 1In one embodiment of the present invention, the heat exchange surface 11 is further provided with a third opening, the substrate 10 is provided with a third opening on both sides in the first direction a, and the second tail smoke-blocking structure 23 is provided at the edge of the third opening.

[0076] This design allows the third opening to also act as a turbulence mechanism, altering the normal flow of high-temperature flue gas between the heat exchange tube and the sidewall of the substrate 10. It better guides the high-temperature flue gas to the wall of the adjacent heat exchange tube, increasing the scouring effect of the flue gas on the tube wall and thus enhancing the heat transfer performance between the high-temperature flue gas and the tube wall. Furthermore, the third opening reduces weight, resulting in a lighter heat exchanger with the heat exchange fins 100.

[0077] In practical applications, the third opening can be triangular, prismatic, rectangular, or other shapes. During the manufacturing process, the intensity of the high-temperature flue gas scouring the tail of the heat exchange tube can be controlled by changing the size, position, and shape of the third opening, thereby adjusting the heat exchange capacity between the high-temperature flue gas and the heat exchange tube.

[0078] Please see Figure 1 and Figure 2 In one embodiment of the present invention, the tail portion 13 of the substrate is provided with a plurality of recesses 131, and a recess 131 is provided between two adjacent mounting holes 111; the smoke-blocking structure 20 also includes a third tail smoke-blocking structure 24, and a third tail smoke-blocking structure 24 is provided on the edge of each recess 131. The third tail smoke-blocking structure 24 includes two third smoke-blocking flanges 241 arranged at an angle, and the two third smoke-blocking flanges 241 face two adjacent heat exchange tubes respectively.

[0079] With this configuration, the recessed portion 131 can also serve as a turbulence-inducing element, altering the normal flow of high-temperature flue gas in the tail region 13 of the substrate. This allows the third tail smoke-blocking structure 24 to guide the high-temperature flue gas towards the wall of the heat exchange tube, increasing the scouring effect of the high-temperature flue gas on the heat exchange tube wall and thus enhancing the heat transfer performance between the high-temperature flue gas and the heat exchange tube wall. Furthermore, the third tail smoke-blocking structure 24 can block the high-temperature flue gas in the tail region 13 of the substrate, preventing it from prematurely detaching from the heat exchange surface 11 of the heat exchange fin 100. This extends the residence time of the high-temperature flue gas on the heat exchange surface 11 of the heat exchange fin 100, enhancing the turbulent heat transfer performance in the tail region 13 of the substrate of the heat exchange fin 100, thereby improving the heat transfer performance between the high-temperature flue gas and the heat exchange fin 100.

[0080] In addition, by setting the third tail smoke baffle structure 24 as two third tail flanges arranged at an angle, the flow direction of the high-temperature flue gas after passing through the third tail flanges can be better changed, so that more high-temperature flue gas can scour the tube wall of the heat exchange tube, thereby enhancing the heat exchange performance between the high-temperature flue gas and the heat exchange tube.

[0081] In some embodiments, the angle between the third smoke-blocking flange 241 of the third tail smoke-blocking structure 24 and the substrate 10 can be 90 degrees, so that the third smoke-blocking flange 241 can better change the flow direction of the high-temperature flue gas, so as to form a better guiding and turbulence effect.

[0082] In practical applications, the included angle between the two third smoke baffles 241 can be determined according to the actual usage. The flow direction and flow speed of the high-temperature flue gas can be controlled by adjusting the included angle between the two third smoke baffles 241, thereby adjusting the heat transfer performance between the high-temperature flue gas and the heat exchange tube.

[0083] Please see Figure 1 In one embodiment of the present invention, the smoke-blocking structure 20 may further include a side wall flange 25, which extends along the direction from the tail 13 of the substrate to the front 12 of the substrate, and the substrate 10 is provided with side wall flanges 25 on both sides in the length direction.

[0084] With this configuration, the sidewall flange 25 can also prevent the high-temperature flue gas from leaving the heat exchange surface 11 of the heat exchange fin 100 too early, thereby extending the residence time of the high-temperature flue gas on the heat exchange surface 11 of the heat exchange fin 100, enhancing the turbulent heat transfer performance of the substrate tail 13 region of the heat exchange fin 100, and thus improving the heat transfer performance between the high-temperature flue gas and the heat exchange fin 100.

[0085] This utility model also proposes a heat exchanger, which includes multiple heat exchange tubes and heat exchange fins 100. The specific structure of the heat exchange fins 100 is as described in the above embodiments. Since this heat exchanger adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. Each heat exchange tube passes through a mounting hole 111 in the heat exchange fin 100.

[0086] In this embodiment, the heat exchanger may include multiple heat exchange fins 100, which are arranged sequentially along the length direction (first direction a) of the heat exchange tubes. Adjacent heat exchange fins 100 can be positioned and spaced apart by a smoke baffle structure 20, so that a fluid channel is formed between any two adjacent heat exchange fins 100. High-temperature flue gas or air can flow through the fluid channel to exchange heat with the heat exchange fins 100 and the heat exchange tubes. Furthermore, for two adjacent heat exchange tubes, a space can also be formed between them for the flow of high-temperature flue gas or air, so that the fluid can fully exchange heat with the heat exchange tubes to improve heat transfer performance.

[0087] This utility model also proposes a water heater, which includes a heat exchanger. The specific structure of the heat exchanger is as described in the above embodiments. Since this water heater adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0088] In this embodiment, the water heater may further include a shell, a burner, and a combustion chamber. The burner and the heat exchanger are both disposed inside 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 to the heat exchanger and exchanges heat with the water in the heat exchange tubes of the heat exchanger to heat the water flowing through the heat exchange tubes.

[0089] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A heat exchange fin, characterized in that, include: A substrate has a heat exchange surface and opposing front and rear ends. The heat exchange surface has multiple mounting holes for mounting heat exchange tubes. The mounting holes are arranged side-by-side along a first direction and have a centerline along the first direction. The front end of the substrate has multiple central front openings, with one central front opening between two adjacent mounting holes. The horizontal line containing the trailing edge of the central front opening is located above the centerline of the mounting hole. The distance between any two edge lines at the front end of the substrate and the wall of the mounting hole is equal. The smoke-blocking structure includes multiple first tail smoke-blocking structures, with one first tail smoke-blocking structure corresponding to each of two adjacent mounting holes. The first tail smoke-blocking structure is located near the tail of the substrate. The first tail smoke-blocking structure includes two first smoke-blocking flanges spaced apart along the first direction. The two first smoke-blocking flanges are arranged at an included angle and face the two adjacent heat exchange tubes respectively.

2. The heat exchange fins as described in claim 1, characterized in that, If the distance between the trailing edge of the opening in the middle section and the center line of the mounting hole is defined as L, then the following condition must be met: 0.5mm≤L≤3mm.

3. The heat exchange fins as described in claim 2, characterized in that, If the distance between the trailing edge of the opening in the middle section and the center line of the mounting hole is defined as L, then L = 1.7 mm.

4. The heat exchange fin as described in any one of claims 1 to 3, characterized in that, The edge line at the front end of the substrate is an arc-shaped line, and the wall of the mounting hole is an arc-shaped wall.

5. The heat exchange fin as described in any one of claims 1 to 3, characterized in that, The smoke-blocking structure also includes multiple central smoke-blocking structures. A central smoke-blocking structure is provided between two adjacent mounting holes. The central smoke-blocking structure is located between the tail end and the front end of the substrate and below the central front opening. The central smoke-blocking structure includes two central smoke-blocking flanges arranged at an angle, with the two central smoke-blocking flanges facing the two adjacent heat exchange tubes respectively.

6. The heat exchange fins as described in claim 5, characterized in that, Let L1 be the maximum distance between the two central smoke-blocking flanges and L2 be the minimum distance between two adjacent mounting holes. Then, L1 ≤ L2.

7. The heat exchange fin as described in any one of claims 1 to 3, characterized in that, Let L3 be the maximum distance between the two first smoke-blocking flanges located below the same mounting hole, and L4 be the axial distance of the mounting hole along the center line. Then, L3 ≤ L4.

8. The heat exchange fin as described in any one of claims 1 to 3, characterized in that, The smoke-blocking structure further includes a second tail smoke-blocking structure. The substrate is provided with the second tail smoke-blocking structure on both sides in the first direction. The second tail smoke-blocking structure is located close to the tail of the substrate. The second tail smoke-blocking structure faces the heat exchange tube adjacent to it.

9. The heat exchange fin as described in any one of claims 1 to 3, characterized in that, The substrate has multiple recesses at its tail end, with one recess corresponding to each of two adjacent mounting holes; the smoke-blocking structure further includes: The third tail smoke-blocking structure is provided at the edge of each of the concave portions. The third tail smoke-blocking structure includes two third smoke-blocking flanges arranged at an angle, with the two third smoke-blocking flanges facing the two adjacent heat exchange tubes respectively.

10. A heat exchanger, characterized in that, include: Multiple heat exchange tubes; The heat exchange fins as described in any one of claims 1 to 9, wherein each heat exchange tube passes through one of the mounting holes.

11. A water heater, characterized in that, Including the heat exchanger as described in claim 10.

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