Heat exchanger fin, heat exchange fin assembly and heat exchanger

Abstract

The invention relates to a heat exchanger fin, a heat exchange fin assembly and a heat exchanger. The heat exchanger fin comprises a fin body, wherein the fin body is provided with a first surface and a second surface which are deviated from each other; a plurality of mounting pipes are arranged on the fin body at intervals, and the plurality of mounting pipes are arranged in parallel at intervals; the mounting pipe is used for mounting the heat exchange pipe; the baffling assemblies are arranged between the two adjacent mounting pipes; the baffle assembly comprises a first baffle plate and a second baffle plate, and the first baffle plate is convexly arranged on the first surface; the second baffle plate is convexly arranged or concavely arranged on the first surface; the first baffle plate and the second baffle plate are arranged along the airflow direction; and the first baffle plate and the second baffle plate are in step transition. The first baffle plates and the second baffle plates are in step transition, so that the baffle plates in different planes effectively break growth of boundary layers on the surface of the fin body, heat exchange between the fin and flue gas is promoted, and the heat exchange efficiency is remarkably improved.

Description

Technical Field

[0001] The present application relates to the field of heat exchangers, and in particular to a heat exchanger fin, a heat exchange fin assembly and a heat exchanger. Background Art

[0002] In the heat exchange process of traditional tube-fin heat exchangers, after the high-temperature airflow enters the fins, the airflow flowing against the heat exchange tube quickly exchanges heat with the tube wall. This part of the airflow has high heat exchange efficiency and the temperature drops quickly. The high-temperature airflow flowing in the gap between the heat exchange tubes mainly relies on heat transfer with the fins to transfer heat to the heat exchange tubes, so the heat exchange efficiency is low and the flue gas outlet temperature is high. In addition, in the leeward area of ​​the heat exchange tube, due to the flow separation of the airflow, large-scale vortices and pressure drops will be formed here, further affecting heat transfer and increasing airflow resistance.

[0003] The existing technology mainly blocks the airflow in the gap of the heat exchange tube by setting flanged holes on the fins, and sets flanged baffles at the tail of the fins to force it to flow to the wall of the heat exchange tube to enhance the heat exchange capacity of the heat exchange tube. However, due to the reduction of the flue gas flow area and the increase of the local flow velocity, it will bring greater flow resistance. In order to enhance the heat exchange capacity of the leeward area of ​​the heat transfer tube, the flue gas is guided to the leeward side of the heat exchange tube by setting guide ribs, further increasing the effective heat exchange area between the flue gas and the fins and enhancing the heat exchange capacity.

[0004] The above methods all guide the high-temperature flue gas to the vicinity of the heat exchange tubes through flanges or guide ribs, while the airflow in the gap far away from the heat exchange tubes is blocked, and the heat exchange capacity is limited. The heat transferred by the airflow at this position is far from reaching the limit of the thermal conductivity of the fins themselves, which increases the fluid resistance and also leads to the waste of heat exchange materials at this position. Summary of the invention

[0005] The present application provides a heat exchanger fin, a heat exchange fin assembly and a heat exchanger, which guide the airflow to achieve low-resistance flow in multiple heat exchange fin cavities, fully utilize the high thermal conductivity of the fins to transfer heat, and the fins have a larger effective utilization area, lower resistance, more uniform heat flux density, greater heat transfer power, and stronger heat exchange capacity.

[0006] To this end, the present application provides a heat exchanger fin, comprising:

[0007] The fin body has a first surface and a second surface which are separated from each other; a plurality of mounting tubes are arranged at intervals on the fin body, and the plurality of mounting tubes are arranged in parallel and at intervals; the mounting tubes are used to install heat exchange tubes;

[0008] The baffle assembly is arranged between two adjacent mounting tubes; the baffle assembly includes a first baffle and a second baffle, the first baffle is convexly arranged on the first surface; the second baffle is convexly arranged on or concavely arranged on the first surface; the first baffle and the second baffle are arranged along the airflow direction; wherein, there is a step transition between the first baffle and the second baffle.

[0009] As a preferred solution of the present application, the air flow inlet of the first baffle away from the second baffle is smaller than the air flow outlet of the first baffle close to the second baffle; the air flow inlet of the second baffle close to the first baffle is smaller than the air flow outlet of the second baffle away from the first baffle.

[0010] As a preferred solution of the present application, the long side of the second baffle away from the first baffle is larger than the long side of the first baffle close to the second baffle;

[0011] The short side of the second baffle plate close to the first baffle plate is larger than the short side of the first baffle plate away from the second baffle plate.

[0012] Wherein, the long side of the first baffle plate close to the second baffle plate is greater than or equal to the short side of the second baffle plate close to the first baffle plate.

[0013] As a preferred solution of the present application, the first baffle is arranged at an angle with the mounting tube along the flow direction and close to the bevel of the mounting tube;

[0014] And / or, the second baffle is arranged at an angle with respect to the mounting tube along the flow direction, with the oblique edge close to the mounting tube.

[0015] As a preferred solution of the present application, it also includes a guide flange, which is protruded from the first surface and is located on the side of the second baffle away from the first baffle, and is spaced apart from the second baffle.

[0016] As a preferred solution of the present application, the guide flange is provided on the edge of the fin body;

[0017] And / or, the guide flange is arranged in an arc shape and protrudes in the direction of the second baffle.

[0018] As a preferred solution of the present application, it also includes two spoiler flanges, wherein the spoiler flange is arranged between the guide flange and the second deflector; the two spoiler flanges are respectively arranged corresponding to the two ends of the guide flange.

[0019] As a preferred solution of the present application, it also includes a diverter flange, which is convexly arranged on the first surface and is located on the side of the first baffle away from the second baffle; the diverter flange is spaced apart from the first baffle; the side of the diverter flange away from the first baffle is convex.

[0020] As a preferred solution of the present application, the side of the diverter flange facing away from the first baffle has two diverter portions arranged at an angle, and the two diverter portions extend toward the mounting tube respectively.

[0021] A heat exchange fin assembly comprises at least two of the above-mentioned heat exchanger fins, wherein a plurality of the heat exchanger fins are stacked.

[0022] A heat exchanger comprises a heat exchange tube. The heat exchanger also comprises the above-mentioned heat exchange fin assembly. The heat exchange tube is arranged on a mounting tube of the heat exchanger fin of the heat exchange fin assembly.

[0023] The beneficial effects provided by this application:

[0024] The heat exchanger fin comprises: a fin body having a first surface and a second surface which are opposite to each other; a plurality of mounting tubes are arranged at intervals on the fin body, and the plurality of mounting tubes are arranged in parallel and at intervals; the mounting tubes are used to install heat exchange tubes; a baffle assembly is arranged between two adjacent mounting tubes; the baffle assembly comprises a first baffle and a second baffle, the first baffle is convexly arranged on the first surface; the second baffle is convexly arranged on or concavely arranged on the first surface; the first baffle and the second baffle are arranged along the airflow direction; wherein, there is a step transition between the first baffle and the second baffle. The present application uses a step transition between the first baffle and the second baffle so that the baffles of different planes effectively break the growth of the boundary layer on the surface of the fin body, so that the airflow promotes the continuous renewal and regeneration of the temperature boundary layer and the velocity boundary layer by breaking the continuity of the boundary layer, thereby being able to fully transfer the heat flow in the flue gas, thereby significantly improving the efficiency of heat exchange. In addition, by guiding the airflow to achieve low-resistance flow in the flow channels of multiple heat exchange fins, the high thermal conductivity of the fins is fully utilized to transfer heat, so that the effective utilization area of ​​the fin body is larger, the resistance is lower, the heat flux density is more uniform, the heat transfer power is greater, and the heat exchange capacity is stronger, thereby achieving the purpose of improving the overall heat exchange performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0026] Figure 1 This is a schematic diagram of the structure of the heat exchanger fin in the first embodiment of the present application;

[0027] Figure 2 This is a schematic structural diagram of a heat exchanger in the first embodiment of the present application;

[0028] Figure 3 This is a right side cross-sectional view of the heat exchanger in the first embodiment of the present application, i.e., a directional view of the flue gas flow;

[0029] Figure 4 This is a schematic structural diagram of the heat exchanger fins in the second embodiment of the present application;

[0030] Figure 5 This is a schematic structural diagram of a heat exchanger in the second embodiment of the present application;

[0031] Figure 6 This is a right side cross-sectional view of the heat exchanger in the second embodiment of the present application, i.e., a directional view of the flue gas flow;

[0032] Figure 7 This is a schematic structural diagram of the heat exchanger fins in the third embodiment of the present application;

[0033] Figure 8 This is a schematic structural diagram of a heat exchanger in the third embodiment of the present application;

[0034] Fig. 9 This is a direction diagram of smoke flow in the third embodiment of the present application;

[0035] Fig.10 This is a schematic structural diagram of the heat exchanger fins in the fourth embodiment of the present application;

[0036] Fig.11 This is a schematic structural diagram of a heat exchanger in the fourth embodiment of the present application;

[0037] Fig.12 This is a right side cross-sectional view of the heat exchanger in the fourth embodiment of the present application, i.e. a directional view of the flue gas flow;

[0038] Fig.13 This is a heat exchange effect diagram of the heat exchanger fins in this application.

[0039] Description of reference numerals:

[0040] 1. Fin body; 2. Mounting tube; 3. Baffle assembly; 31. First baffle; 32. Second baffle; 4. Diverter flange; 41. Diverter portion; 42. Diverter hole; 5. Guide flange; 6. Spoiler flange; 7. First gap; 8. Second gap. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0042] First embodiment

[0043] like Figures 1 to 3 As shown, it is the first embodiment of the present application. In this embodiment, the heat exchanger fin comprises a fin body 1 and a baffle assembly 3; the fin body 1 has a first surface and a second surface which are separated from each other; a plurality of mounting tubes 2 are arranged at intervals on the fin body 1, and the plurality of mounting tubes 2 are arranged in parallel and at intervals; the mounting tubes 2 are used to install heat exchange tubes, and water passes through the heat exchange tubes to absorb heat;

[0044] The baffle assembly 3 is arranged between two adjacent mounting tubes 2; the baffle assembly 3 includes a first baffle 31 and a second baffle 32, the first baffle 31 is convexly arranged on the first surface; the second baffle 32 is concavely arranged on the first surface, and convexly arranged on the second surface; the first baffle 31 and the second baffle 32 are arranged along the airflow direction; wherein, there is a step transition between the first baffle 31 and the second baffle 32.

[0045] It is further explained that the baffle assembly 3 may include two baffles or more than two baffles, and the baffle assembly 3 is arranged between two adjacent heat exchange tubes. Preferably, it is arranged in the middle gap between two adjacent heat exchange tubes to form multiple redeveloped turbulent boundary layers. Among them, multiple convex baffles arranged in the gap between the heat exchange tubes along the flow direction divide the airflow channel into two parts, one is the high-efficiency heat exchange zone close to the heat exchange tube, and the other is the low-resistance diffusion zone inside the baffle. In the high-efficiency heat exchange zone, the airflow directly exchanges heat with the fin body 1 on the surface of the heat exchange tube and the heat exchange tube itself; since the airflow velocity in this area is fast and the temperature difference with the surface of the heat exchange tube is large, the heat exchange rate of the airflow is very fast; while in the low-resistance diffusion zone, due to the gradual increase in the flow cross-sectional area of ​​the airflow, the flow velocity of the airflow is relatively slow. In this area, the airflow does not directly exchange heat with the heat exchange tube, so the temperature difference is small and the heat exchange rate is relatively slow. However, since the airflow in this area is long, and the baffles on different planes effectively break the growth of the boundary layer on the surface of the fin body 1, that is, by destroying the boundary layer on the surface of the fin body 1, the temperature boundary layer and the velocity boundary layer are continuously regenerated, so the heat flow of the flue gas can be fully transferred, and the heat exchange between the fin body 1 and the flue gas is promoted, thereby ensuring the improvement of the overall heat exchange efficiency. In addition, the fin body 1, the first baffle 31 and the second baffle 32 are all in different parallel planes, preferably distributed at equal intervals, dividing the flue gas flow area into three layers, and the flue gas passes through the three layers in turn, and its boundary layer is continuously generated and destroyed, so as to effectively cut the center layer of the airflow and break the boundary layer, thereby achieving the purpose of improving the heat exchange efficiency.

[0046] When a plurality of heat exchanger fins of this embodiment are stacked to form a heat exchange fin assembly, Figure 3 As shown, the first baffle 31 of the lower heat exchanger fin and the second surface of the upper heat exchanger fin have a first gap 7; the second baffle 32 of the upper heat exchanger fin and the first surface of the lower heat exchanger fin have a second gap 8. The upper surface of the first baffle 31 is a first inclined surface, and the first gap 7 gradually increases along the flow direction of the airflow; wherein the upper surface of the first baffle 31 is the side close to the second surface of the upper heat exchanger fin. The lower surface of the second baffle 32 is a second inclined surface, and the second gap 8 gradually increases along the flow direction of the airflow; wherein the lower surface of the second baffle 32 is the side close to the first surface of the lower heat exchanger fin. The end of the first inclined surface is higher than the end of the second inclined surface, and the end of the first inclined surface and the end of the second inclined surface are arranged in a step, that is, the first gap 7 and the second gap 8 are arranged at a distance, which together form an expansion channel inside the first baffle 31 and the second baffle 32. The expansion flow channel can effectively reduce the velocity of the internal smoke flow, thereby reducing the impact force of the smoke on the wall surface of the heat exchange tube.

[0047] Further, such as Figure 1 and Figure 2 As shown, the air flow inlet of the first baffle 31 away from the second baffle 32 is smaller than the air flow outlet of the first baffle 31 close to the second baffle 32; the air flow inlet of the second baffle 32 close to the first baffle 31 is smaller than the air flow outlet of the second baffle 32 away from the first baffle 31.

[0048] To further elaborate, Figure 1 and Figure 2 As shown, the airflow inlet size of the first baffle plate 31 is smaller than the airflow outlet size of the first baffle plate 31; correspondingly, the airflow inlet size of the second baffle plate 32 is also smaller than the airflow outlet size of the second baffle plate 32. Figure 3 As shown, a certain distance is set between the airflow outlet of the first baffle 31 and the airflow inlet of the second baffle 32; wherein, the upper surface of the first baffle 31 is an inclined surface, and the first gap 7 gradually increases along the airflow direction; the lower surface of the second baffle 32 is an inclined surface, and the second gap 8 gradually increases along the airflow direction; thereby, the first baffle 31 and the second baffle 32 form an expansion channel inside them. The expansion channel can effectively reduce the speed of the internal smoke flow, and in this way, the impact force of the smoke on the wall of the heat exchange tube can be reduced. In other words, the expansion channel formed inside the first baffle 31 and the second baffle 32 is a low-resistance diffusion zone. As the flow space in this area gradually increases, the airflow speed is naturally slower. However, since this area does not directly exchange heat with the heat exchange tube, its temperature difference is relatively small, and the airflow heat exchange rate is also slow. However, due to the slow airflow speed and long flow path, and the first baffle 31 and the second baffle 32 located in different planes breaking the growth of the boundary layer on the surface of the fin body 1, the heat flow of the flue gas can be fully transferred, thereby improving the heat exchange efficiency. In addition, when encountering the guide flange 5 and the spoiler flange 6 at the tail, the airflow will form turbulence, which further enhances the heat exchange efficiency of the tail of the fin body 1, thereby improving the overall heat exchange performance.

[0049] Further, such as Figure 1 and Figure 2As shown, the long side of the second baffle 32 away from the first baffle 31 is greater than the long side of the first baffle 31 close to the second baffle 32; the short side of the second baffle 32 close to the first baffle 31 is greater than the short side of the first baffle 31 away from the second baffle 32. Among them, the long side of the first baffle 31 close to the second baffle 32 is greater than or equal to the short side of the second baffle 32 close to the first baffle 31. This ensures that an effective airflow channel can be formed between the first baffle 31 and the second baffle 32, so that the airflow can pass smoothly while maintaining a low flow resistance, thereby ensuring the heat exchange efficiency while also ensuring the stability and safety of the equipment operation.

[0050] Further, such as Figure 1 and Figure 2 As shown, the hypotenuse of the first baffle 31 close to the mounting tube 2 is arranged obliquely with the mounting tube 2 along the flow direction; the hypotenuse of the second baffle 32 close to the mounting tube 2 is arranged obliquely with the mounting tube 2 along the flow direction. Further, it can be observed that the hypotenuse of the first baffle 31 on the side close to the mounting tube 2 is arranged obliquely with the mounting tube 2 along the flow direction; at the same time, or independently of the above situation, the hypotenuse of the second baffle 32 on the side close to the mounting tube 2 is also arranged obliquely with the mounting tube 2 along the flow direction; wherein the obliquely arranged baffles can effectively guide the airflow to flow toward the fin body 1 and form turbulence, that is, the airflow forms a certain impact angle on the surface of the fin body 1 when passing through these baffles, thereby effectively enhancing the heat exchange effect. At the same time, the hypotenuse of the first baffle 31 and the hypotenuse of the second baffle 32 are connected to the plane of the fin body 1 to form an inclined guide slope, which guides the airflow to flow along the high-efficiency heat exchange area of ​​the wall of the heat exchange tube and the low-resistance diffusion area inside the baffle; in addition, the guide slope also forms a tapered flow channel with the wall of the mounting tube 2, so that the airflow outside the guide baffle cavity flows along the heat exchange tube, thereby optimizing the airflow path, improving the heat exchange efficiency, and reducing the wear of the flue gas on the wall of the heat exchange tube.

[0051] Further, such as Figure 1 and Figure 2 As shown, it also includes a guide flange 5, which is protruding from the first surface and is located on the side of the second baffle 32 away from the first baffle 31, and is spaced apart from the second baffle 32. It can guide the airflow passing through the baffle to flow to the gradually diverging flow channels formed by the long sides of the baffles and the guide flange 5 on both sides, which can effectively guide the flow direction of the fluid, avoid local turbulence of the airflow, and improve the heat exchange efficiency.

[0052] Further, such as Figure 1 and Figure 2 As shown, the guide flange 5 is arranged at the edge of the fin body 1; the edge arrangement of the guide flange 5 can effectively control the formation of the airflow boundary layer, reduce the thickness of the boundary layer, and make the airflow more evenly distributed on the entire heat exchange surface, which helps to improve the utilization efficiency of the airflow and reduce local turbulence and energy loss;

[0053] Further, such as Figure 1 and Figure 2 As shown, the guide flange 5 is arranged in an arc shape and protrudes in the direction of the second deflector 32, which increases the turbulence of the airflow when passing through, thereby enhancing the impact force of the airflow on the fin surface, thereby improving the heat exchange performance and further optimizing the distribution of the airflow.

[0054] When a plurality of heat exchanger fins of this embodiment are stacked to form a heat exchange fin assembly, Figure 3 As shown, the upper end of the guide flange 5 of the lower heat exchanger fin abuts against the second surface of the upper heat exchanger fin to ensure that the airflow is divided from both sides, thereby improving the heat exchange efficiency.

[0055] Further, such as Figure 1 and Figure 2 As shown, two spoiler flanges 6 are also included, and the spoiler flanges 6 are arranged between the guide flange 5 and the second baffle 32; the two spoiler flanges 6 are respectively arranged at the two ends of the guide flange 5, and are located at the two ends of the outlet of the second baffle 32, which can further guide the airflow, so that the airflow produces more eddy and vortex effects when passing through, reducing the sudden change of the airflow at the boundary, further reducing local turbulence and energy loss, thereby improving its heat exchange performance. In this embodiment, the shape of the spoiler flange 6 can be cylindrical, square or square columnar, and can also be arranged in other shapes.

[0056] When a plurality of heat exchanger fins of this embodiment are stacked to form a heat exchange fin assembly, Figure 3 As shown, there is a gap between the spoiler flange 6 of the lower layer of the heat exchanger fin and the second surface of the upper layer of the heat exchanger fin. It can also be seen that the flange height of the spoiler flange 6 is lower than the flange height of the guide flange 5. When the airflow flows out from the second deflector 32, part of the airflow hits the guide flange 5 and exchanges heat with the fin body 1. Another part of the airflow hits the spoiler flange 6 and is diverted again. At this time, a small part of the airflow will pass over the spoiler flange 6 to reach the guide flange 5. Since the guide flange 5 of the lower layer of the heat exchanger fin is in contact with the second surface of the upper layer, it is ensured that the airflow and the fin body 1 have sufficient effective contact area for heat transfer, thereby effectively improving the heat exchange efficiency.

[0057] It should be noted that if Figure 1 and Figure 2As shown, the guide flange 5 is arranged in the downstream area of ​​the last baffle plate, and cooperates with the last baffle plate to form a secondary expansion channel, further expanding the airflow channel to reduce the airflow velocity, reduce the pressure drop loss, and increase the residence time of the airflow on the heat exchanger surface, thereby improving the heat exchange efficiency. In particular, a spoiler flange 6 is arranged at the tail of the expansion channel to decelerate and form turbulence, further improving the heat exchange efficiency. At the same time, eddy currents and noise are reduced, thereby improving the overall performance and reliability of the equipment.

[0058] Further, such as Figure 1 and Figure 2 As shown, in this embodiment, the heat exchanger fin also includes a diverter flange 4, which is convexly arranged on the first surface and is located on the side of the first baffle 31 away from the second baffle 32; the diverter flange 4 is spaced apart from the first baffle 31; the side of the diverter flange 4 away from the first baffle 31 is convex. The diverter flange 4 is set at a certain height to distribute the flow of the airflow passing through the gap, so that the heat carried by the passing airflow does not exceed the limit of the heat transfer of the baffle itself, and prevents the local temperature of the baffle from being too high, making it difficult to carry out an effective heat exchange process. In addition, the diverter flange 4 is convex, which increases the contact area between the airflow and the surface of the fin body 1, thereby improving the heat transfer coefficient and further enhancing the heat exchange effect.

[0059] Further, such as Figure 1 and Figure 2 As shown, the side of the diverter flange 4 away from the first baffle 31 has two diverter portions 41 arranged at an angle, and the two diverter portions 41 extend toward the mounting tube 2 respectively, which can guide the airflow direction so that the airflow flows more smoothly to the mounting tube 2, reducing the airflow resistance and energy loss. In addition, a diverter hole 42 is provided in the space surrounded by the two diverter portions 41, and the diverter hole 42 runs through the fin body 1; the distribution and flow path of the airflow are further optimized, so that the airflow generates more small vortices when passing through, and the impact force of the airflow on the fin surface is enhanced, and the heat transfer efficiency is further improved.

[0060] When a plurality of heat exchanger fins of this embodiment are stacked to form a heat exchange fin assembly, Figure 3 As shown, there is a gap between the diverter flange 4 of the lower heat exchanger fin and the second surface of the upper heat exchanger fin, so that the airflow can not only be diverted from both sides, but also pass through the gap directly to the first baffle 31 for heat exchange, reducing airflow resistance and energy loss.

[0061] It should be clear that the present application achieves low-resistance flow by guiding the airflow in the flow channels of multiple heat exchanger fins, making full use of the high thermal conductivity of the fin body 1 to transfer heat. The fin body 1 has a larger effective utilization area, lower resistance, more uniform heat flux density, greater heat transfer power, and stronger heat exchange capacity. Reasonable diversion and rectification forms are used to promote heat exchange between flue gas and the fin body 1, making full use of the surface area and heat transfer capacity of the fin body 1. Therefore, the airflow flows evenly, the flow resistance is smaller, and the heat exchange effect is better. Since the resistance of the fin body 1 is reduced, the miniaturization of the heat exchanger can be achieved by reducing the fin pitch. By improving the heat exchange capacity of the fin body 1, the weight of the fin body 1 per unit flow area can be reduced, that is, the number of fin bodies 1 can be reduced to reduce costs.

[0062] Second embodiment

[0063] like Figures 4 to 6 As shown, for the sake of simplicity, only the differences between the second embodiment and the first embodiment are described below. The difference between the second embodiment and the first embodiment is that the second baffle 32 is protruding from the first surface, and the height of the first baffle 31 is lower than the height of the second baffle 32; specifically, the main function of the first baffle 31 is to guide most of the airflow into the second baffle 32 and pass through the first expansion channel smoothly. In order to achieve this goal, the height of the first baffle 31 is set to be lower than the height of the second baffle 32, allowing most of the airflow to enter the second baffle 32 to pass through the first expansion channel. When a plurality of heat exchanger fins of this embodiment are stacked to form a heat exchange fin assembly, such as Figure 6As shown, the first baffle 31 of the lower heat exchanger fin and the second surface of the upper heat exchanger fin have a first gap 7; the second baffle 32 of the lower heat exchanger fin and the second surface of the upper heat exchanger fin have a second gap 8. The first gap 7 is along the airflow, wherein the width of the first gap 7 along the airflow direction is greater than the width of the second gap 8. In addition, the upper surface of the first baffle 31 is a first inclined surface, and the first gap 7 gradually increases along the airflow direction; wherein the upper surface of the first baffle 31 is the side of the second surface of the heat exchanger fin close to the upper layer. The lower surface of the second baffle 32 is a second inclined surface, and the second gap 8 gradually increases along the airflow direction; wherein the upper surface of the second baffle 32 is the side of the second surface of the heat exchanger fin close to the upper layer. The end of the first inclined surface is lower than the end of the second inclined surface, and the end of the first inclined surface and the end of the second inclined surface are arranged in a step; the first gap 7 and the second gap 8 are arranged at a distance, which together form an expansion channel inside the first baffle 31 and the second baffle 32. The expansion channel can effectively reduce the speed of the internal smoke flow, and in this way, the impact force of the smoke on the wall of the heat exchange tube can be reduced. In this embodiment, the diversion flange 4 is not provided on the fin body 1; the specific structure of the heat exchanger fin refers to the above embodiment, so it at least has all the beneficial effects brought by the technical solution of the above embodiment, which will not be repeated here.

[0064] Third embodiment

[0065] like Figures 7 to 9 For the sake of simplicity, only the differences between the third embodiment and the second embodiment are described below. Fig. 9 As shown, a polygonal hole penetrating the fin body 1 is provided between the first baffle 31 and the second baffle 32, so that the first baffle 31 and the second baffle 32 are arranged at intervals; and the spoiler flange 6 is cylindrical. When multiple heat exchanger fins of this embodiment are stacked to form a heat exchange fin assembly, as shown in FIG. Fig. 9 As shown, the upper surface of the first baffle 31 of the lower heat exchanger fin is parallel to the second surface of the upper heat exchanger fin, so that the first gap 7 is an evenly spaced gap; the upper surface of the second baffle 32 of the lower heat exchanger fin is parallel to the second surface of the upper heat exchanger fin, so that the second gap is an evenly spaced gap; wherein the width of the second gap 8 along the airflow direction is greater than the width of the first gap 7 along the airflow direction. In other words, the height of the first baffle 31 is lower than the height of the second baffle 32, and most of the airflow is guided into the second baffle 32 to smoothly pass through the first expansion channel. The specific structure of the heat exchanger fin refers to the above embodiment, so it at least has all the beneficial effects brought by the technical solution of the above embodiment, which will not be repeated here.

[0066] Fourth embodiment

[0067] like Figures 10 to 12 For the sake of simplicity, only the differences between the fourth embodiment and the first embodiment are described below. The difference between the fourth embodiment and the first embodiment is that in this embodiment, the fin body 1 is not provided with a flow-dividing flange 4. Fig.12 As shown, a polygonal hole penetrating the fin body 1 is provided between the first baffle plate 31 and the second baffle plate 32, so that the first baffle plate 31 and the second baffle plate 32 are arranged at intervals. When a plurality of heat exchanger fins of this embodiment are stacked to form a heat exchange fin assembly, as shown in FIG. Fig.12 As shown, the upper surface of the first baffle 31 of the lower heat exchanger fin is parallel to the second surface of the upper heat exchanger fin, so that the first gap 7 is an evenly spaced gap; the lower surface of the second baffle 32 of the upper heat exchanger fin is parallel to the first surface of the upper heat exchanger fin, so that the second gap is an evenly spaced gap; wherein the width of the second gap 8 along the airflow direction is greater than or equal to the width of the first gap 7 along the airflow direction. In other words, the height of the first baffle 31 is lower than or equal to the height of the second baffle 32, and most of the airflow is guided into the second baffle 32 to smoothly pass through the first expansion channel. The specific structure of the heat exchanger fin refers to the above embodiment, so it at least has all the beneficial effects brought by the technical solution of the above embodiment, which will not be repeated here.

[0068] like Fig.13 The figure shows the heat exchange effect of the heat exchanger fins of the present application in use. Fig.13 It can be observed that the temperature of the smoke at the entrance is relatively low. As the smoke flows, its temperature decreases and then gradually increases and is evenly distributed. The temperature of the smoke at the exit is evenly distributed. During the flow of smoke, in the process of passing through the diverter 41 and the diverter hole 42, when the smoke enters the left-right symmetrical second expansion flow channel, the heat exchange of the smoke gradually increases and is evenly distributed, and the temperature difference is relatively large; when the smoke completely passes through the diverter 41 and the diverter hole 42 and enters the first baffle 31 and the second baffle 32, the heat exchange of the smoke decreases rapidly, and the temperature difference is relatively small; when the smoke gradually flows out of the first baffle 31 and the second baffle 32 and enters the spoiler flange 6, the heat exchange of the smoke gradually increases; when the smoke gradually passes through the spoiler flange 6 and enters the guide flange 5, the heat exchange of the smoke still gradually increases and is evenly distributed.

[0069] Specifically, when the flue gas enters the diversion flange 4 for diversion, part of the flue gas is guided to the high-efficiency heat exchange area near the heat transfer tube, and passes through the left-right symmetrical second expansion flow channel, that is, the flue gas hits the oblique edges of the first baffle 31 and the second baffle 32 and the wall surface of the fin body 1 for heat exchange; the airflow after heat exchange will then pass through the spoiler flange 6 for further diversion; finally, it will impact the guide flange 5 at the tail and be further diverted again; finally, the airflow after heat transfer will flow out from the tail of the heat transfer tube, thus completing the entire heat dissipation process; some of the flue gas passes through the first baffle 31 and the second baffle 32 to form a low-resistance diffusion area of ​​the first expansion flow channel; the flue gas exchanges heat with the fin body 1 inside the baffle; the airflow after heat exchange will then pass through the spoiler flange 6 for further diversion; finally, it will impact the guide flange 5 at the tail and be further diverted again; finally, the airflow after heat transfer will flow out from the tail of the heat transfer tube. That is, the continuous regeneration of the temperature boundary layer and the velocity boundary layer is promoted by breaking the boundary layer on the surface of the fin body 1, so the heat flow of the flue gas can be fully transferred, and the heat exchange between the fin body 1 and the flue gas is promoted, thereby ensuring the improvement of the overall heat exchange efficiency.

[0070] The present application uses a step transition between the first baffle 31 and the second baffle 32, so that the baffles of different planes effectively break the growth of the boundary layer on the surface of the fin body 1, so that the airflow promotes the continuous renewal and regeneration of the temperature boundary layer and the velocity boundary layer by breaking the continuity of the boundary layer, so that the heat flow in the flue gas can be fully transferred, thereby significantly improving the efficiency of heat exchange. In addition, by guiding the airflow to achieve low-resistance flow in the flow channels of multiple heat exchange fins, the high thermal conductivity of the fins is fully utilized to transfer heat, so that the effective utilization area of ​​the fin body 1 is larger, the resistance is lower, the heat flux density is more uniform, the heat transfer power is greater, and the heat exchange capacity is stronger, so as to achieve the purpose of improving the overall heat exchange performance.

[0071] The present application also provides a heat exchange fin assembly, such as Figure 2 , Figure 4 , Figure 8 , Fig.10As shown, the heat exchange fin assembly includes at least two of the above-mentioned heat exchanger fins, and a plurality of the heat exchanger fins are stacked. Specifically, from the flow direction, the two adjacent heat exchanger fins stacked up and down, the first baffle 31 located at the bottom, the second baffle 32 located at the top, and the fin body 1 are respectively provided with a certain interval and will not overlap each other. In other words, the fin body 1, the first baffle 31 and the second baffle 32 belong to different parallel planes, and are preferably distributed at equal intervals, dividing the flue gas flow area into three layers. The flue gas passes through multiple layers in turn, and its boundary layer is continuously generated and destroyed to effectively cut the central layer of the airflow and break the boundary layer, thereby achieving the purpose of improving the heat exchange efficiency. The specific structure of the heat exchanger fin refers to the above-mentioned embodiment. Since a heat exchange fin assembly adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0072] The present application also provides a heat exchanger (not shown), including a heat exchange tube and a heat exchange fin assembly, wherein the heat exchange tube is arranged on the heat exchanger fin mounting tube 2 of the heat exchanger fin assembly. The specific structure of the heat exchange fin assembly refers to the above embodiment. Since a heat exchanger adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0073] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0074] The above is a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A heat exchanger fin, characterized in that: include: The fin body (1) has a first surface and a second surface which are separated from each other; a plurality of mounting tubes (2) are arranged at intervals on the fin body (1), and the plurality of mounting tubes (2) are arranged in parallel and at intervals; the mounting tubes (2) are used to mount heat exchange tubes; A baffle assembly (3) is arranged between two adjacent mounting tubes (2); the baffle assembly (3) comprises a first baffle plate (31) and a second baffle plate (32); the first baffle plate (31) is convexly arranged on the first surface; the second baffle plate (32) is convexly arranged on or concavely arranged on the first surface; the first baffle plate (31) and the second baffle plate (32) are arranged along the airflow direction; wherein the first baffle plate (31) and the second baffle plate (32) are in a step transition.

2. The heat exchanger fin according to claim 1, characterized in that: The air flow inlet of the first baffle (31) facing away from the second baffle (32) is smaller than the air flow outlet of the first baffle (31) close to the second baffle (32); and the air flow inlet of the second baffle (32) close to the first baffle (31) is smaller than the air flow outlet of the second baffle (32) facing away from the first baffle (31).

3. The heat exchanger fin according to claim 1, characterized in that: The long side of the second baffle (32) facing away from the first baffle (31) is longer than the long side of the first baffle (31) close to the second baffle (32); The short side of the second baffle (32) close to the first baffle (31) is larger than the short side of the first baffle (31) away from the second baffle (32). Wherein, the long side of the first baffle (31) close to the second baffle (32) is greater than or equal to the short side of the second baffle (32) close to the first baffle (31).

4. The heat exchanger fin according to claim 1, characterized in that: The first baffle (31) is arranged at an angle with respect to the mounting tube (2) along the flow direction at a beveled edge close to the mounting tube (2); And / or, the second baffle (32) is arranged at an angle with respect to the mounting tube (2) along the flow direction, with the oblique edge close to the mounting tube (2).

5. The heat exchanger fin according to claim 1, characterized in that: It also comprises a guide flange (5), which is protruding from the first surface and is located on the side of the second baffle (32) away from the first baffle (31), and is spaced apart from the second baffle (32).

6. The heat exchanger fin according to claim 5, characterized in that: The guide flange (5) is arranged on the edge of the fin body (1); And / or, the guide flange (5) is arranged in an arc shape and protrudes in the direction of the second baffle plate (32).

7. The heat exchanger fin according to claim 5, characterized in that: It also comprises two spoiler flanges (6), wherein the spoiler flanges (6) are arranged between the guide flange (5) and the second baffle (32); the two spoiler flanges (6) are arranged corresponding to the two ends of the guide flange (5).

8. The heat exchanger fin according to any one of claims 1 to 7, characterized in that: It also comprises a diverter flange (4), the diverter flange (4) being protruding from the first surface and located on the side of the first baffle (31) away from the second baffle (32); the diverter flange (4) and the first baffle (31) being spaced apart; and the side of the diverter flange (4) away from the first baffle (31) being in a convex shape.

9. The heat exchanger fin according to claim 8, characterized in that: The side of the flow-dividing flange (4) facing away from the first baffle (31) has two flow-dividing portions (41) arranged at an angle, and the two flow-dividing portions (41) extend towards the mounting tube (2) respectively.

10. A heat exchange fin assembly, characterized in that: The heat exchange fin assembly comprises at least two heat exchanger fins according to any one of claims 1 to 9, and a plurality of the heat exchanger fins are stacked.

11. A heat exchanger, comprising a heat exchange tube, characterized in that: The heat exchanger further comprises a heat exchange fin assembly as claimed in claim 10, wherein the heat exchange tube is arranged on a mounting tube (2) of a heat exchanger fin of the heat exchange fin assembly.

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