Heat exchange fin, heat exchanger comprising same and water heater

Abstract

The utility model discloses a heat exchange fin, a heat exchanger comprising the same and a water heater. Each heat exchange fin comprises upper-layer pipe holes and lower-layer pipe holes which are distributed up and down and arranged in a staggered mode, the upper-layer pipe holes are arranged in parallel, the lower-layer pipe holes are arranged in parallel, and a semi-closed or closed isolation hollowed-out area is arranged between every two adjacent lower-layer pipe holes and the upper-layer pipe holes. The boundary of the isolation hollowed-out area at least comprises a plurality of sections of three sections of area edges which are adjacent to and correspond to the upper-layer pipe holes or the lower-layer pipe holes, and the area edges are straight lines and / or curves. The distance between the edge of the area and the circle center of the corresponding upper-layer pipe hole or the lower-layer pipe hole is within the range of 1.3-2.2 times of the radius of the corresponding upper-layer pipe hole or the lower-layer pipe hole. Under the condition that the reduction of the heat exchange efficiency is relatively small, an over-temperature area is not easy to appear in the heat exchange fins, so that the heat exchange fins are prevented from being oxidized or damaged after being allowed for a long time.

Description

TECHNICAL FIELD

[0001] The utility model relates to heat exchange fin, including its heat exchanger and water heater. BACKGROUND

[0002] Heat exchangers are widely used in various fields for heat exchange. Among them, for example, heat exchangers in water heaters and other fields have a series of heat exchange tubes and heat exchange fins, which exchange heat between the medium in the heat exchange tube and the medium where the heat exchange fin is located through the heat exchange fin. For example, the heat exchange fin recorded in Chinese patent publication CN212378582U includes a plurality of perforations (divided into upper and lower tube holes arranged in parallel and staggered), connected by heat exchange tubes.

[0003] Current heat exchange fins are designed in various shapes and have various flanges or hollows to meet the corresponding performance requirements, ignoring the durability of the heat exchange fins. In the case of pursuing the improvement of heat exchange efficiency, the heat exchange fins are prone to oxidation and discoloration after normal heavy load operation, and will be oxidized away after a long time of operation, eventually rotting through, resulting in a significant decline in efficiency and machine performance. SUMMARY

[0004] The technical problem to be solved by the utility model is to overcome the defect that the heat exchange fins are prone to oxidation and damage in the prior art.

[0005] The utility model solves the above technical problems by the following technical solutions:

[0006] A heat exchange fin, comprising upper and lower tube holes arranged in parallel and staggered, the upper tube holes and the lower tube holes are arranged in parallel, and a half-closed or closed isolation hollow area is arranged between adjacent two lower tube holes and upper tube holes, wherein the boundary of the isolation hollow area at least includes several sections adjacent to the upper tube hole or the lower tube hole and corresponding three section area edges, the area edge is a straight line and / or a curve, and the area edge is within 1.3-2.2 times the radius of the corresponding upper tube hole or lower tube hole relative to the center distance of the corresponding upper tube hole or lower tube hole.

[0007] In the scheme, the spacing and diameter of the upper layer pipe hole and the lower layer pipe hole are taken as references to reasonably set the boundary of the isolation hollowed-out area, so that the temperature of the heat exchange fin is not easily too high in the case of relatively small reduction of heat exchange efficiency (compared with no isolation hollowed-out area), thereby avoiding oxidation of the heat exchange fin for a long time until damage. After normal heavy load operation, there is basically no blackening and discoloration phenomenon at the bottom of the heat exchange fin, i.e., there is no local heat transfer failure leading to high temperature oxidation discoloration. When used for a long time, the heat exchange fin will not be oxidized off the layer, and it is not easy to be rotten and worn out, thereby avoiding a significant decrease in efficiency and performance of the machine.

[0008] Preferably, the edges of the regions corresponding to the upper layer pipe holes are connected to the edges of the regions corresponding to the lower layer pipe holes on both sides, and the edges of the regions corresponding to the lower layer pipe holes on both sides are separated from each other to form a semi-closed isolation hollowed-out area. The isolation hollowed-out area thus formed is located between the lower layer pipe holes on both sides, and the easily locally temperature concentrated area can be more completely removed by hollowing-out, so that the heat exchange fin is less likely to be damaged.

[0009] Preferably, the distance between each edge and the center of the corresponding upper layer pipe hole or lower layer pipe hole is within the range of 1.8 to 2.2 times the radius of the corresponding upper layer pipe hole or lower layer pipe hole. In this way, it can be ensured that the regions far away from the upper layer pipe holes and the lower layer pipe holes are hollowed out. Thus, the existence of solid parts due to the distance from the upper layer pipe holes and the lower layer pipe holes being relatively far away can be avoided, thereby further avoiding oxidation and damage of the heat dissipation fin.

[0010] Preferably, each of the edges is a circular arc with the corresponding upper layer pipe hole or lower layer pipe hole as the center. In this way, the temperature easily too high area can be more evenly divided and hollowed out, and the processing and design of the heat exchange fin are also facilitated.

[0011] Preferably, a horizontal flange is arranged between the lower layer pipe hole and the upper layer pipe hole, and a circular flange is arranged between the lower layer pipe hole, the isolation hollowed-out area, the lower layer pipe hole, and the horizontal flange. The horizontal flange can avoid the flue gas from the bottom directly flowing out of the heat exchange fin, thereby improving the flue gas flow rate and the heat exchange efficiency. The circular flange and the horizontal flange are arranged around the lower layer pipe hole, so that the flue gas on both sides of the circular flange and the horizontal flange, i.e., the lower layer pipe hole and the isolation hollowed-out area, is isolated to a certain extent, so that the flue gas flowing through the lower layer pipe hole and the flue gas flowing from the isolation hollowed-out area to the upper layer pipe hole can be efficiently heat exchanged, thereby reducing the influence of the low-temperature flue gas after being heat exchanged by the lower layer heat exchange pipe on the heat exchange efficiency of the upper layer heat exchange pipe.

[0012] Preferably, the region edges corresponding to the upper layer pipe holes respectively connect with the region edges corresponding to the lower layer pipe holes on both sides, and the region edges corresponding to the lower layer pipe holes on both sides directly connect or connect through transition edges to form a fully enclosed isolated hollowed-out region. The regions hollowed out by the fully enclosed isolated hollowed-out region are all regions where the temperature is relatively concentrated, i.e., regions far away from the upper layer pipe holes and the lower layer pipe holes. At the same time, the area occupied by the fully enclosed isolated hollowed-out region is relatively small in terms of the material removed, so the loss in heat exchange efficiency is also relatively small, which can well balance the heat exchange efficiency and avoid the generation of temperature concentration. At the same time, for the case where the center distance of the lower layer pipes is close, by connecting the region edges corresponding to the lower layer pipe holes with each other, the amount of material removed can be reduced, on the one hand to ensure the heat exchange efficiency by reducing the material removal, and on the other hand to allow the lower layer pipe holes to be closer to each other to ensure the heat exchange efficiency.

[0013] Preferably, the distance between each region edge and the center of the corresponding lower layer pipe hole is within the range of 1.8-2.2 times the radius of the corresponding lower layer pipe hole, and the distance between each region edge and the center of the corresponding upper layer pipe hole is within the range of 1.3-1.7 times the radius of the corresponding upper layer pipe hole. Since the heat in the high-temperature flue gas will decrease after being absorbed by the lower layer, more area is not needed for heat absorption. Therefore, the region edges corresponding to the upper layer pipe holes can be closer to the upper layer pipe holes to expand the area of the isolated hollowed-out region, while also less affecting the heat exchange efficiency.

[0014] Preferably, each of the region edges is a straight line, a curve, or a combination of a straight line and a curve.

[0015] Preferably, a spacing flange is arranged between one side or both sides of the isolated hollowed-out region and the corresponding lower layer pipe hole, and the spacing flange has an upwardly inclined extension trend. The extension trend of the spacing flange separates the lower layer pipe hole and the isolated hollowed-out region, so that the flue gas on both sides of the spacing flange, i.e., the lower layer pipe hole and the isolated hollowed-out region, is isolated to some extent, thereby guiding the flue gas from the lower layer to the upper layer pipe hole in the middle of the upper layer, improving the flue gas flow rate, so that the flue gas flowing through the lower layer pipe hole and the flue gas flowing from the isolated hollowed-out region to the upper layer pipe hole can respectively perform efficient heat exchange, reducing the influence of the low-temperature flue gas after being exchanged by the lower layer heat exchange pipe on the heat exchange efficiency of the upper layer heat exchange pipe.

[0016] Preferably, the spacing flange is formed by bending the material cut from the upper punching of the heat exchange fin. In this way, the heat exchange fin can be integrally formed.

[0017] Preferably, the length of the spacing flange is 4-12 mm.

[0018] The intersection of the region edges is preferably transitioned by a circular arc or a chamfer. The circular arc or chamfer can avoid stress concentration in the intersection region of the region edges, and ensure the integrity of the heat exchange fin during processing.

[0019] The upper portion of the heat exchange fin corresponding to the two sides of the upper layer pipe hole is preferably an inwardly converging bevel, and the lower portion of the heat exchange fin corresponding to the two sides of the lower layer pipe hole is a vertical bevel. The bevels are bent or integrally bent. The bevel helps to gather the rising flue gas and improve the heat exchange efficiency.

[0020] The diameter of the upper layer pipe hole and the lower layer pipe hole is preferably 14-16 mm, the center distance between the centers of the lower layer pipe hole and the upper layer pipe hole is 20-24 mm, and the center distance between adjacent lower layer pipe holes is 38-42 mm. Alternatively, the diameter of the upper layer pipe hole and the lower layer pipe hole is 15-17 mm, the center distance between the centers of the lower layer pipe hole and the upper layer pipe hole is 20-24 mm, and the center distance between adjacent lower layer pipe holes is 36-40 mm.

[0021] A heat exchanger includes a heat exchange pipe and a plurality of heat exchange fins. The heat exchange pipe is connected in series in the upper layer pipe hole or the lower layer pipe hole of the heat exchange fins.

[0022] A water heater includes the heat exchange fin.

[0023] The heat exchange fin has the following advantages. The temperature of the heat exchange fin is not too high, and the heat exchange fin is not easily damaged by oxidation. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 FIG. 1 is a perspective view of a heat exchange fin according to an embodiment of the present application.

[0025] Figure 2 FIG. 2 is a front view of the heat exchange fin according to the embodiment of the present application.

[0026] Figure 3 FIG. 3 is a structure diagram of a hollow isolation region according to the embodiment of the present application.

[0027] Figure 4 FIG. 4 is a surface temperature cloud chart of the heat exchange fin according to the embodiment of the present application.

[0028] Figure 5 FIG. 5 is a cross-sectional temperature cloud chart of the heat exchange fin according to the embodiment of the present application.

[0029] Figure 6 It is the three-dimensional structure schematic view of the heat exchange fin of the embodiment 2 of the utility model.

[0030] Figure 7 It is the main view structure schematic view of the heat exchange fin of the embodiment 2 of the utility model.

[0031] Figure 8 It is the surface temperature nephogram of the heat exchange fin of the embodiment 2 of the utility model.

[0032] Figure 9 It is the cross section temperature nephogram of the heat exchange fin of the embodiment 2 of the utility model.

[0033] Figure 10 It is the three-dimensional structure schematic view of the heat exchange fin of the embodiment 3 of the utility model.

[0034] Figure 11 It is the main view structure schematic view of the heat exchange fin of the embodiment 3 of the utility model.

[0035] Figure 12 It is the surface temperature nephogram of the heat exchange fin of the embodiment 3 of the utility model.

[0036] Figure 13 It is the cross section temperature nephogram of the heat exchange fin of the embodiment 3 of the utility model.

[0037] Figure 14 It is the main view structure schematic view of the heat exchange fin of the contrast example.

[0038] Explanation of reference signs

[0039] Lower pipe hole 100

[0040] Upper pipe hole 200

[0041] Isolation seal hollow area 300

[0042] Area edge 310

[0043] Interval flanging 410

[0044] Circular flanging 420

[0045] Horizontal flanging 510

[0046] Flanging 520

[0047] Flanging 530

[0048] Vertical flanging 610

[0049] Oblique flanging 620

[0050] Diameter A

[0051] Pitch B, C, D, S DETAILED DESCRIPTION

[0052] The utility model is further illustrated below by way of examples, but the utility model is not limited in the scope of the examples.

[0053] As Figures 1-13 shown in the embodiments 1-embodiment 3, the utility model discloses a heat exchange fin, including upper layer pipe hole 200 and lower layer pipe hole 100 staggered arrangement and distribution up and down, upper layer pipe hole 200 and lower layer pipe hole 100 between and between parallel arrangement, wherein, two lower layer pipe hole 100 and upper layer pipe hole 200 between adjacent are provided with a half closed or closed isolation hollow area 300, wherein, the boundary of isolation hollow area 300 includes at least several sections with upper layer pipe hole 200 or lower layer pipe hole 100 adjacent and corresponding three section area edge 310, area edge 310 is straight line and / or curve, area edge 310 relative to the center distance of corresponding upper layer pipe hole 200 or lower layer pipe hole 100 is in the range of 1.3-2.2 times of the radius of corresponding upper layer pipe hole 200 or lower layer pipe hole 100.

[0054] In the utility model, isolation hollow area 300 is located between pipe hole (the space in the triangle formed by two lower layer pipe hole 100 and an upper layer pipe hole 200 is arranged), isolation hollow area 300 itself can have various geometric shapes, but the main body is formed by three section area edge 310.Three section area edge 310 respectively with adjacent two upper layer pipe hole 200 and a lower layer pipe hole 100 form corresponding relationship, that is, form corresponding according to the distance of upper layer pipe hole 200 and lower layer pipe hole 100, for example, the area edge 310 closest to upper layer pipe hole 200 is corresponding upper layer pipe hole 200. Figure 1 Combining

[0055] In some embodiments, the three-section region edge 310 can directly form a semi-open isolated hollow region 300, or a triangular isolated hollow region 300, but in other embodiments, the isolated hollow region 300 can also include some other auxiliary edges in addition to the three-section region edge 310, but these other auxiliary edges should not change the overall shape constituted by the three-section region edge 310. For example, these edge auxiliaries are only edges (such as chamfers at corners, circular arc transitions, etc.) that are added for process needs such as easy processing or mode cracking, or are connecting lines between two-section region edges 310 corresponding to the lower pipe holes 100 to make the hollow region 300 closed, and the like, which can reasonably achieve the basic purpose that can be achieved by the utility model.

[0056] In the utility model, the distance of the region edge 310 relative to the center of the corresponding upper pipe hole 200 or lower pipe hole 100 is within the range of 1.3-2.2 times the radius of the corresponding upper pipe hole 200 or lower pipe hole 100, that is, the position of the region edge 310 needs to be within a certain range from the spacing S of the corresponding upper pipe hole 200 or lower pipe hole 100. For example, if the radius of the upper pipe hole 200 is 8 mm, if the range of 1.3 times the radius is S=10.4 mm, that is, the spacing S of the region edge 310 corresponding to the upper pipe hole 200 is 10.4 mm from the upper pipe hole 200. If the range of 2.2 times the radius is the distance of the region edge 310 corresponding to the upper pipe hole 200 from the upper pipe hole 200 is 17.6 mm. For the selection of 1.3-2.2 times, a suitable range can be selected according to the spacing of the upper pipe hole 200 and the lower pipe hole 100, or the spacing between the lower pipe holes 100. The distance (spacing S) of the region edge 310 relative to the center of the corresponding upper pipe hole 200 or lower pipe hole 100 can be determined in a geometric manner, for example, as shown in the figure, when the region edge 310 is a straight line, the circular arc drawn through the center of the corresponding upper pipe hole 200 or lower pipe hole 100 is tangent to the region edge 310, and the radius of the tangent circular arc is the spacing S. When the region edge 310 is a curve, such as a circular arc, the ideal case is to set the radius of the region edge 310 according to the spacing S, and the center is the corresponding upper pipe hole 200 or lower pipe hole 100. Of course, when the region edge 310 is a curve, the circular arc drawn through the center of the corresponding upper pipe hole 200 or lower pipe hole 100 can also be tangent to the region edge 310, and the radius of the tangent circular arc is the spacing S. Figure 3

[0057] ​In this invention, appropriate distances can be reserved between the centers of the upper and lower pipe holes 200 and 100, respectively, to ensure high heat exchange efficiency and low flue gas resistance, based on actual needs. Furthermore, by using the distance and diameter of the upper and lower pipe holes 200 and 100 as references, the boundary of the isolation hollow area 300 is reasonably set. This results in a relatively small reduction in heat exchange efficiency (compared to the case without the isolation hollow area 300), making it less likely for excessively hot areas to appear in the heat exchange fins, thus preventing oxidation and damage to the heat exchange fins over time.

[0058] like Figures 1-13 As shown, in the preferred embodiment, the intersection of the region edges 310 is treated with a rounded transition or a chamfer. The rounded or chamfered edges can avoid stress concentration in the intersection area of ​​the region edges 310, ensuring the integrity of the heat exchange fins during processing.

[0059] like Figures 1-13 As shown, in the preferred embodiment, the upper part of the heat exchange fins has inwardly tapered beveled flanges 620 on both sides corresponding to the upper layer pipe hole 200, and the lower part of the heat exchange fins has vertical flanges 610 on both sides corresponding to the lower layer pipe hole 100. The beveled flanges 620 and the vertical flanges 610 are formed by bending or bending as a whole. The beveled flanges 620 help to gather the rising flue gas and improve heat exchange efficiency.

[0060] The heat exchange fins of this invention can be used in heat exchangers, especially in heat exchangers for water heaters. The heat exchanger includes heat exchange tubes and several heat exchange fins, with the heat exchange tubes connected in series in the upper tube holes 200 or the lower tube holes 100 of the multiple heat exchange fins.

[0061] Example 1

[0062] like Figures 1-3As shown, the region edges 310 of the embodiment are roughly inverted triangular, and the region edges 310 of the corresponding upper layer tube holes 200 respectively connect with the region edges 310 of the corresponding lower layer tube holes 100 on both sides, and the region edges 310 of the corresponding lower layer tube holes 100 on both sides directly connect or connect through transition edges to form a fully enclosed isolated hollowed region 300. The region hollowed by the fully enclosed isolated hollowed region 300 is a region where the temperature is relatively concentrated, i.e., a region far from the upper layer tube holes 200 and the lower layer tube holes 100. At the same time, the area occupied by the fully enclosed isolated hollowed region 300 is relatively small compared to the material removed by the semi-enclosed arrangement, so the loss in heat exchange efficiency is also relatively small, which can well balance the heat exchange efficiency and avoid the generation of temperature concentration. At the same time, for the case where the center distance of the lower layer tubes is close, by connecting the region edges 310 of the corresponding lower layer tube holes 100 with each other, the amount of material removed can be reduced, on the one hand to ensure the heat exchange efficiency by reducing the material removal, and on the other hand to allow the lower layer tube holes 100 to be closer to each other to ensure the heat exchange efficiency.

[0063] As shown in the figure, Figures 1-3 The distance (interval S) between each region edge 310 and the center of the corresponding lower layer tube hole 100 is respectively within the range of 1.8-2.2 times the radius of the corresponding lower layer tube hole 100, and the distance (interval S) between each region edge 310 and the center of the corresponding upper layer tube hole 200 is respectively within the range of 1.3-1.7 times the radius of the corresponding upper layer tube hole 200. Since the heat in the high-temperature flue gas will decrease after being absorbed by the lower layer, it does not need more area to absorb heat. Therefore, the region edges 310 corresponding to the upper layer tube holes 200 can be closer to the upper layer tube holes 200 to expand the area of the isolated hollowed region 300, while also less affecting the heat exchange efficiency.

[0064] As shown in the figure, Figures 1-3 The region edges 310 of the embodiment are straight lines, but can also be set as curves or a combination of straight lines and curves according to needs. The radius of the tangent arc drawn from the center of the corresponding upper layer tube hole 200 or lower layer tube hole 100 to the region edge 310 is the interval S, i.e., the distance between each region edge 310 and the center of the corresponding upper layer tube hole 200 or lower layer tube hole 100. More simply, a perpendicular line is drawn from the center of the corresponding upper layer tube hole 200 or lower layer tube hole 100 to the region edge 310, and the distance of the line segment of the perpendicular line is the interval S.

[0065] As shown in the figure, Figures 1-3As shown, one side or both sides of the isolation hollowed region 300 of the embodiment and the corresponding lower layer pipe hole 100 are provided with a spacing flange 410, which has an upwardly inclined extension tendency. The extension tendency of the spacing flange 410 makes it separate along the lower layer pipe hole 100 and the isolation hollowed region 300, so that the flue gas on both sides of the spacing flange 410, i.e. the lower layer pipe hole 100 and the isolation hollowed region 300, is isolated to a certain extent, thereby guiding the flue gas from the lower layer to the middle to the upper layer pipe hole 200 of the upper layer, improving the flue gas flow rate, so that the flue gas flowing through the lower layer pipe hole 100 and the flue gas flowing from the isolation hollowed region 300 to the upper layer pipe hole 200 can be efficiently heat exchanged, reducing the influence of the low-temperature flue gas after heat exchange by the lower layer heat exchange pipe on the heat exchange efficiency of the upper layer heat exchange pipe. The spacing flange 410 of the embodiment is substantially parallel to the adjacent region edge 310, of course, in other embodiments, it can also be provided to be non-parallel. The spacing flange 410 can be in the form of a straight strip as shown in Figures 1-3 FIG. 2, or in the form of a whole composed of multiple flanges such as the circular flanges in Embodiment 2, or in other forms with a certain length of isolation.

[0066] As shown in Figures 1-3 , the spacing flange 410 of the embodiment is bent from the material cut by punching on the heat exchange fin. In this way, the heat exchange fin can be integrally formed. Of course, in other embodiments, the spacing flange 410 can be fixed on the heat exchange fin by welding or other fixing methods. The width of the spacing flange 410 can be set according to the needs when multiple heat exchange fins are stacked, so as to avoid interference or obstruction of multiple heat exchange fins during the stacking process. The length of the spacing flange 410, i.e. the length along the upwardly inclined side, is 4mm-12mm. A too short spacing flange 410 will affect the isolation effect of the flue gas, and a too long spacing flange will result in more material being cut, i.e. a larger hole being formed, which will have a certain impact on the heat exchange efficiency.

[0067] As shown in Figures 1-3 , the intersection of the region edge 310 of the embodiment is transitioned by a circular arc or a chamfer. The circular arc or chamfer can avoid stress concentration at the intersection of the region edge 310, ensuring the integrity during processing of the heat exchange fin.

[0068] As shown in Figures 1-3As shown, the upper part of the heat exchange fin of the embodiment corresponds to the upper layer pipe hole 200, and the lower part of the heat exchange fin corresponds to the lower layer pipe hole 100. The upper part of the heat exchange fin is provided with an inwardly-retracted bevel 620, and the lower part of the heat exchange fin is provided with a vertical bevel 610. The bevel 620 and the vertical bevel 610 are respectively formed by bending. The bevel 620 helps to gather the rising flue gas, thereby improving the heat exchange efficiency. In addition, the embodiment can further be provided with a horizontal bevel 510, a bevel 520 and a bevel 530 to further guide the flue gas. The horizontal bevel 510 can avoid the flue gas from the lower part directly flowing out of the heat exchange fin, thereby improving the flue gas flow rate and improving the heat exchange efficiency. The spacing bevel 410 and the horizontal bevel 510 are arranged around the lower layer pipe hole 100. Thus, the flue gas on both sides of the spacing bevel 410 and the horizontal bevel 510, i.e. the lower layer pipe hole 100 and the isolation hollowed-out area 300, is isolated to a certain extent. The flue gas flowing through the lower layer pipe hole 100 and the flue gas flowing from the isolation hollowed-out area 300 to the upper layer pipe hole 200 can respectively perform efficient heat exchange, thereby reducing the influence of the low-temperature flue gas after being exchanged by the lower heat exchange pipe on the heat exchange efficiency of the upper heat exchange pipe.

[0069] As shown in FIG. 6, the heat exchange fin of the embodiment is provided with a spacing bevel 410, a horizontal bevel 510, a bevel 520, a bevel 530, a bevel 540 and a bevel 550. Figures 1-3 As shown, the diameter A of the upper layer pipe hole 200 and the lower layer pipe hole 100 is 14mm-16mm, the center distance C between the lower layer pipe hole 100 and the upper layer pipe hole 200 is 20mm-24mm, and the center distance B between adjacent lower layer pipe holes 100 is 38-42mm.

[0070] As shown in FIG. 6, the heat exchange fin of the embodiment is provided with a spacing bevel 410, a horizontal bevel 510, a bevel 520, a bevel 530, a bevel 540 and a bevel 550. Figure 4 As shown in FIG. 6, the heat exchange fin of the embodiment is provided with a spacing bevel 410, a horizontal bevel 510, a bevel 520, a bevel 530, a bevel 540 and a bevel 550. Figure 5 As shown in FIG. 6, the heat exchange fin of the embodiment is provided with a spacing bevel 410, a horizontal bevel 510, a bevel 520, a bevel 530, a bevel 540 and a bevel 550. Figure 4 As shown in FIG. 6, the heat exchange fin of the embodiment is provided with a spacing bevel 410, a horizontal bevel 510, a bevel 520, a bevel 530, a bevel 540 and a bevel 550. Figure 4 As shown in FIG. 6, the heat exchange fin of the embodiment is provided with a spacing bevel 410, a horizontal bevel 510, a bevel 520, a bevel 530, a bevel 540 and a bevel 550. Figure 5The middle Congo indicates the cross-sectional temperature cloud of the heat exchange fin, which shows the overall temperature of the internal flue gas. Due to the arrangement of the related flange, it can be clearly seen that the high-temperature flue gas below the upper tube hole 200 can directly heat exchange with the heat exchange tube at the upper tube hole 200, thereby improving the heat exchange efficiency. Overall, in the case of avoiding serious oxidation of the heat exchange fin, the heat efficiency that can be achieved is 89.14%. The heat efficiency is a basic performance requirement of the heat exchanger or the water heater. On the one hand, whether the combustion of the combustion chamber is sufficient determines the heat efficiency. On the other hand, the resistance of the heat exchanger also affects the heat efficiency; the higher the efficiency, the better, which represents that the heat exchange of the heat exchanger is more sufficient, and the exhaust gas temperature will also be lower. Among them, in the case of consistent performance of the combustion chamber, the smaller the resistance of the heat exchanger (that is, the higher the heat exchange efficiency), the higher the heat efficiency.

[0071] As shown in Figure 14 , it is a heat exchange fin of a control example. Figure 14 The heat exchange fin shown in Figure 14 is basically the same in size and shape as the heat exchange fin of the present embodiment, and the main difference is that Figure 14 the heat exchange fin does not have an isolated hollow area. Therefore, in the actual use process, Figure 14 the heat exchange fin of the present embodiment can achieve a heat efficiency of 90%, and the heat efficiency of the heat exchange fin of the present embodiment is also basically close to this index. Therefore, it can be seen that the present embodiment can avoid the oxidation and blackening of the heat exchange fin while maintaining the basic consistency of the heat exchange efficiency.

[0072] Embodiment 2

[0073] As shown in Figure 6 and Figure 7 , the area edge 310 of the present embodiment is roughly a half-opened long strip. The area edge 310 corresponding to the upper tube hole 200 of the present embodiment is connected with the area edge 310 corresponding to the lower tube hole 100 on both sides, and the area edge 310 corresponding to the lower tube hole 100 on both sides is separated from each other to form a semi-closed isolated hollow area 300. The isolated hollow area 300 thus achieved is located between the lower tube holes 100 on both sides, and the easily partially temperature concentrated area can be more completely removed by hollowing, so that the heat exchange fin is less likely to be damaged.

[0074] As shown in Figure 6 and Figure 7As shown in the drawings, the distance (interval S) between the region edge 310 of the embodiment and the center of the corresponding upper tube hole 200 or lower tube hole 100 is in the range of 1.8-2.2 times the radius of the corresponding upper tube hole 200 or lower tube hole 100. In this way, it can be ensured that the region far away from the upper tube hole 200 and the lower tube hole 100 is hollowed out. Thus, it is avoided that the solid part is close to the upper tube hole 200 and the lower tube hole 100, which leads to heat concentration, and further avoids the oxidation damage of the heat dissipation fin.

[0075] As shown in the drawings, Figure 6 and Figure 7 The region edge 310 of the embodiment is a circular arc with the corresponding upper tube hole 200 or lower tube hole 100 as the center, i.e., a circular arc with the center of the upper tube hole 200 or lower tube hole 100 as the center. In this way, the temperature-easily-excessive region can be evenly divided and hollowed out, and the processing and design of the heat exchange fin are facilitated.

[0076] As shown in the drawings, Figure 6 and Figure 7 The horizontal flange 510 is arranged between the lower tube hole 100 and the upper tube hole 200 of the embodiment, and the circular flange 420 is arranged between the lower tube hole 100, the hollowed-out region 300, the lower tube hole 100, and the horizontal flange 510. The horizontal flange 510 can avoid the flue gas from the bottom directly flowing out of the heat exchange fin, improve the flue gas flow rate, and improve the heat exchange efficiency. The circular flange 420 and the horizontal flange 510 are arranged around the lower tube hole 100, so that the flue gas on both sides of the circular flange 420 and the horizontal flange 510, i.e., the lower tube hole 100 and the hollowed-out region 300, is isolated to a certain extent. The flue gas flowing through the lower tube hole 100 and the flue gas flowing from the hollowed-out region 300 to the upper tube hole 200 can be efficiently heat exchanged, respectively, and the heat exchange efficiency of the upper heat exchange tube is reduced by the low-temperature flue gas after being heat exchanged by the lower heat exchange tube.

[0077] As shown in the drawings, Figure 6 and Figure 7 The intersection of the region edge 310 of the embodiment is transitioned by a circular arc or a chamfer. The circular arc or chamfer can avoid stress concentration in the intersection region of the region edge 310 and ensure the integrity of the heat exchange fin during processing.

[0078] As shown in the drawings, Figure 6 and Figure 7As shown, the upper part of the heat exchange fin of the embodiment corresponds to the upper layer pipe hole 200, and the lower part of the heat exchange fin corresponds to the lower layer pipe hole 100. The two sides of the upper layer pipe hole 200 are inwardly-retracted beveled flanges 620, and the two sides of the lower layer pipe hole 100 are vertical flanges 610. The beveled flanges 620 and the vertical flanges 610 are integrally bent. The beveled flanges 620 help to gather the rising flue gas, thereby improving the heat exchange efficiency. The integrally bent beveled flanges 620 and the vertical flanges 610 can better gather the flue gas, thereby improving the heat exchange efficiency.

[0079] As shown in Figure 6 and Figure 7 , the diameter A of the upper layer pipe hole 200 and the lower layer pipe hole 100 is preferably 14mm-16mm, the center distance C between the centers of the lower layer pipe hole 100 and the upper layer pipe hole 200 is 20mm-24mm, and the center distance B between adjacent lower layer pipe holes 100 is 38-42mm.

[0080] As shown in Figure 8 and Figure 9 , in the embodiment, the diameter A of the upper layer pipe hole 200 and the lower layer pipe hole 100 is 15mm, the center distance C between the centers of the lower layer pipe hole 100 and the upper layer pipe hole 200 is 22mm, the center distance B between adjacent lower layer pipe holes 100 is 40mm, and the distance S between the edge 310 and the center of the corresponding upper layer pipe hole 200 and lower layer pipe hole 100 is 2 times the radius of the corresponding upper layer pipe hole 200 and lower layer pipe hole 100. Figure 8 As shown, the surface temperature cloud chart of the heat exchange fin can be seen, and the color from red to blue on the left side represents the temperature from high to low. Figure 8 The color of the heat exchange fin surface in the figure is relatively uniform, i.e., there is basically no red and yellow, indicating that there is no very concentrated heat. Figure 9 The cross-sectional temperature cloud chart of the heat exchange fin is shown in the figure, which shows the overall temperature of the internal flue gas. Due to the arrangement of the related flanges, it can be clearly seen that the high-temperature flue gas below the upper layer pipe hole 200 can directly heat exchange with the heat exchange pipe at the upper layer pipe hole 200, thereby improving the heat exchange efficiency. Overall, in the case of avoiding serious oxidation of the heat exchange fin, the thermal efficiency can reach 89.05%.

[0081] Example 3

[0082] The main difference between the embodiment and Example 1 is that, as shown in Figure 10 and Figure 11 , the diameter A of the upper layer pipe hole 200 and the lower layer pipe hole 100 is preferably 15mm-17mm, the center distance C between the centers of the lower layer pipe hole 100 and the upper layer pipe hole 200 is 20mm-24mm, and the center distance B between adjacent lower layer pipe holes 100 is 36-40mm.

[0083] AsFigure 12 and Figure 13 As shown in the figure, in this embodiment, the diameters A of the upper layer pipe holes 200 and the lower layer pipe holes 100 are both 16 mm, the center distance C between the lower layer pipe holes 100 and the upper layer pipe holes 200 is 22 mm, the center distance B between adjacent lower layer pipe holes 100 is 38 mm, and the distance S between the region edge 310 and the center of the corresponding upper layer pipe hole 200 and lower layer pipe hole 100 is 2 times the radius of the corresponding upper layer pipe hole 200 and lower layer pipe hole 100. Figure 12 As shown in the figure, the surface temperature cloud chart of the heat exchange fin is shown, and it can be seen that the color from red to blue on the left side represents the case that the temperature is from high to low. Figure 12 In the figure, the color of the heat exchange fin surface is stable and uniform, that is, there is basically no red and yellow, which indicates that there is no case of very concentrated heat. Figure 13 In the figure, the cross-sectional temperature cloud chart of the heat exchange fin is shown, which shows the overall temperature of the internal flue gas. Due to the setting of the related flange, it can be clearly seen that the high-temperature flue gas below the upper layer pipe hole 200 can be directly heated at the heat exchange pipe of the upper layer pipe hole 200, which improves the heat exchange efficiency. Overall, in the case of avoiding serious oxidation of the heat exchange fin, the thermal efficiency can reach 89.86%, which is closer to that of Example 1 Figure 14 The thermal efficiency of the heat exchange fin is shown in the figure.

[0084] The utility model discloses in the case of relatively small reduction of heat exchange efficiency (compared with not setting the isolation hollowed region 300), the area of the heat exchange fin that is not prone to have excessively high temperature, thereby avoiding the oxidation of the heat exchange fin after a long time to damage.

[0085] Although the specific embodiments of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the utility model, and these changes and modifications all fall within the protection scope of the utility model.

Claims

1. A heat exchange fin comprising upper layer tube holes and lower layer tube holes which are arranged in an upper and lower distribution and staggered arrangement, and which are arranged in parallel between the upper layer tube holes and between the lower layer tube holes, characterized in that, The two adjacent lower pipe holes and upper pipe holes are provided with semi-closed or closed isolation hollowed-out areas, wherein the boundaries of the isolation hollowed-out areas at least include several segments of three corresponding area edges adjacent to the upper pipe holes or the lower pipe holes, the area edges are straight lines and / or curves, and the area edges are within the range of 1.3-2.2 times of the radius of the corresponding upper pipe hole or lower pipe hole relative to the distance from the center of the corresponding upper pipe hole or lower pipe hole.

2. The heat exchange fin as set forth in claim 1, wherein The area edges corresponding to the upper pipe holes are connected with the area edges corresponding to the lower pipe holes on both sides, and the area edges corresponding to the lower pipe holes on both sides are separated from each other to form semi-closed isolation hollowed-out areas.

3. The heat exchange fin as set forth in claim 2, wherein The distance of each area edge from the center of the corresponding upper pipe hole or lower pipe hole is within the range of 1.8-2.2 times of the radius of the corresponding upper pipe hole or lower pipe hole.

4. The heat exchange fin as set forth in claim 3, wherein Each area edge is a circular arc with the corresponding upper pipe hole or lower pipe hole as the center.

5. The heat exchange fin as set forth in claim 4, wherein Horizontal flanges are arranged between the lower pipe holes and the upper pipe holes, and circular flanges are arranged between the lower pipe holes, the isolation hollowed-out areas, the lower pipe holes, and the horizontal flanges.

6. The heat exchange fin according to claim 1, wherein The area edges corresponding to the upper pipe holes are connected with the area edges corresponding to the lower pipe holes on both sides, and the area edges corresponding to the lower pipe holes on both sides are directly connected or connected through transition edges to form fully-closed isolation hollowed-out areas.

7. The heat exchange fin as set forth in claim 6, wherein The distance of each area edge from the center of the corresponding lower pipe hole is within the range of 1.8-2.2 times of the radius of the corresponding lower pipe hole, and the distance of each area edge from the center of the corresponding upper pipe hole is within the range of 1.3-1.7 times of the radius of the corresponding upper pipe hole.

8. The heat transfer fin according to claim 7, wherein Each area edge is a straight line, a curve, or a combination of a straight line and a curve.

9. The heat exchange fin as set forth in claim 6, wherein A spacing flange is arranged between one side or both sides of the isolation hollowed-out area and the corresponding lower pipe hole, and the spacing flange has an upward extension trend.

10. The heat transfer fin according to claim 9, wherein The spacing flange is bent from the material cut by punching on the heat exchange fins.

11. The heat exchange fin as set forth in claim 9, wherein The length of the spacing flange is 4-12 mm.

12. The heat transfer fin according to claim 1, wherein The intersection of the area edges is transitioned through a circular arc or an angle.

13. The heat transfer fin according to claim 1, wherein The two sides of the upper pipe holes of the upper part of the heat exchange fins are inwardly converging inclined flanges, and the two sides of the lower pipe holes of the lower part of the heat exchange fins are vertical flanges, and the inclined flanges and the vertical flanges are respectively bent or integrally bent.

14. The heat transfer fin according to any one of claims 1 to 13, wherein The diameters of the upper pipe holes and the lower pipe holes are 14-16 mm, the center-to-center distance between the lower pipe holes and the upper pipe holes is 20-24 mm, and the center-to-center distance between adjacent lower pipe holes is 38-42 mm; or the diameters of the upper pipe holes and the lower pipe holes are 15-17 mm, the center-to-center distance between the lower pipe holes and the upper pipe holes is 20-24 mm, and the center-to-center distance between adjacent lower pipe holes is 36-40 mm.

15. A heat exchanger, characterized by The heat exchanger comprises heat exchange tubes and a plurality of heat exchange fins as claimed in any one of claims 1-14, the heat exchange tubes being connected in series in the upper tube holes or the lower tube holes of the plurality of heat exchange fins.

16. A water heater, characterized by The water heater comprises heat exchange fins as claimed in any one of claims 1-14.

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