Heat exchange fin, heat exchanger comprising same and water heater

Abstract

The invention 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 area edge 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. According to the heat exchanger, under the condition that the reduction of the heat exchange efficiency is relatively small, an over-temperature area is unlikely to appear in the heat exchange fins, so that the heat exchange fins are prevented from being oxidized until damaged after being allowed for a long time.

Description

Technical Field

[0001] The invention relates to a heat exchange fin, a heat exchanger and a water heater comprising the same. Background Art

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

[0003] At present, heat exchange fins are designed into various shapes and various flanges or hollowing are added to meet the corresponding performance requirements, while ignoring the durability of the heat exchange fins themselves. In the pursuit of improving heat exchange efficiency, the heat exchange fins are prone to oxidation and discoloration after normal heavy load operation. After long-term operation, the fins will oxidize and fall off, and eventually rot, resulting in reduced efficiency and significant attenuation of machine performance. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the heat exchange fins are easily damaged by oxidation.

[0005] The present invention solves the above technical problems through the following technical solutions:

[0006] A heat exchange fin comprises upper tube holes and lower tube holes which are distributed up and down and arranged in an alternating manner, wherein the upper tube holes and the lower tube holes are arranged in parallel, and a semi-enclosed or enclosed isolation hollow area is provided between two adjacent lower tube holes and upper tube holes, wherein the boundary of the isolation hollow area comprises at least three sections of area edges which are adjacent to and correspond to the upper tube holes or the lower tube holes, the area edges are straight lines and / or curves, and the distance of the area edges relative to the center of the corresponding upper tube hole or the lower tube hole is within the range of 1.3 to 2.2 times the radius of the corresponding upper tube hole or the lower tube hole.

[0007] In this solution, the spacing and diameter of the upper and lower tube holes are used as references to reasonably set the boundaries of the isolated hollow area. Therefore, when the reduction in heat exchange efficiency (compared to not setting an isolated hollow area) is relatively small, it is not easy for the heat exchange fins to have an over-high temperature area, thereby avoiding oxidation and damage of the heat exchange fins after long-term use. After normal high-load operation, there is basically no blackening and discoloration at the bottom of the heat exchange fins, that is, there is no oxidation discoloration caused by excessive temperature due to the inability to transfer local heat. When used for a long time, the heat exchange fins will not oxidize and fall off, and they are not easy to rot, avoiding the significant attenuation of efficiency and machine performance.

[0008] Preferably, the edges of the area corresponding to the upper tube holes are connected to the edges of the area corresponding to the lower tube holes on both sides, and the edges of the area corresponding to the lower tube holes on both sides are separated from each other to form a semi-enclosed isolated hollowed area. The isolated hollowed area thus realized is located between the lower tube holes on both sides, and the hollowing can more completely remove the area prone to local temperature concentration, so that the heat exchange fins are less likely to be damaged.

[0009] Preferably, the distance between the edge of each area and the center of the corresponding upper tube hole or lower tube hole is within the range of 1.8 to 2.2 times the radius of the corresponding upper tube hole or lower tube hole. This ensures that the areas far from the upper tube hole and the lower tube hole are hollowed out. This avoids the existence of a solid part that is far from the upper tube hole and the lower tube hole, resulting in heat concentration, and further avoids oxidation damage to the heat sink fins.

[0010] Preferably, the edge of each area is an arc centered on the corresponding upper tube hole or lower tube hole. This arrangement can more evenly divide and hollow out the area where the temperature is prone to be too high, and also facilitates the processing and design of the heat exchange fins.

[0011] Preferably, a horizontal flange is provided between the lower tube hole and the upper tube hole, and a circular flange is provided between the lower tube hole, the isolation hollow area, the lower tube hole and the horizontal flange. The horizontal flange can prevent the flue gas from coming up from below from directly rushing into and flowing out of the heat exchange fins, thereby increasing the flue gas flow rate and the heat exchange efficiency. The circular flange and the horizontal flange are arranged together around the lower tube hole, thereby isolating the flue gas on both sides of the circular flange and the horizontal flange, i.e., the flue gas in the lower tube hole and the isolation hollow area to a certain extent, so that the flue gas flowing through the lower tube hole and the flue gas flowing from the isolation hollow area to the upper tube hole can respectively perform efficient heat exchange, thereby reducing the low-temperature flue gas after heat exchange by the lower heat exchange tube affecting the heat exchange efficiency of the upper heat exchange tube.

[0012] Preferably, the edges of the area corresponding to the upper tube holes are connected with the edges of the area corresponding to the lower tube holes on both sides, and the edges of the area corresponding to the lower tube holes on both sides are directly connected or connected through transition edges to form a fully enclosed isolated hollow area. The areas hollowed out by the fully enclosed isolated hollow area are all areas where the temperature is relatively concentrated, that is, areas that are relatively far away from the upper tube holes and the lower tube holes. At the same time, the area occupied by the fully enclosed isolated hollow area is less than the material dug out by the semi-enclosed setting, so the loss in heat exchange efficiency is also less, which can well balance the heat exchange efficiency and avoid the generation of temperature concentration. At the same time, for the situation where the center distance of the lower tube is close, the amount of material removal can be reduced by connecting the edges of the area corresponding to the lower tube holes with each other. On the one hand, the heat exchange efficiency is ensured by reducing material removal, and on the other hand, the heat exchange efficiency is ensured by allowing the lower tube holes to be closer to each other.

[0013] Preferably, the distance between the edge of each area and the center of the corresponding lower tube hole is within the range of 1.8 to 2.2 times the radius of the corresponding lower tube hole, and the distance between the edge of each area and the center of the corresponding upper tube hole is within the range of 1.3 to 1.7 times the radius of the corresponding upper tube hole. Since the heat in the high-temperature flue gas will become smaller when it reaches the upper layer after the lower layer absorbs all the heat, more area is not needed to absorb heat. Therefore, the edge of the area corresponding to the upper tube hole can be closer to the upper tube hole to expand the area of ​​the isolated hollow area, and at the same time, it can also have less impact on the heat exchange efficiency.

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

[0015] Preferably, a spacing flange is provided between one or both sides of the isolation hollowing area and the corresponding lower tube hole, and the spacing flange has an extension tendency inclined upward. The extension tendency of the spacing flange allows it to be separated along the lower tube hole and the isolation hollowing area, thereby isolating the flue gas on both sides of the spacing flange, i.e., the lower tube hole and the isolation hollowing area to a certain extent, thereby guiding the flue gas from the lower layer to the middle to the upper tube hole of the upper layer, increasing the flue gas flow rate, so that the flue gas flowing through the lower tube hole and the flue gas flowing from the isolation hollowing area to the upper tube hole can be efficiently heat exchanged, reducing the low-temperature flue gas after heat exchange by the lower heat exchange tube affecting the heat exchange efficiency of the upper heat exchange tube.

[0016] Preferably, the spacing flanges are formed by bending the material cut from the punching holes on the heat exchange fins, thereby achieving one-piece molding of the heat exchange fins.

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

[0018] Preferably, the intersection of the area edges is processed by arc transition or chamfering. The arc or chamfer can avoid stress concentration in the intersection area of ​​the area edges and ensure the integrity of the heat exchange fin during processing.

[0019] Preferably, the two sides of the heat exchange fins located at the upper part corresponding to the upper tube holes are inwardly retracted oblique flanges, and the two sides of the heat exchange fins located at the lower part corresponding to the lower tube holes are vertical flanges, and the oblique flanges and the vertical flanges are bent separately or as a whole. The oblique flanges help to gather the rising smoke and improve the heat exchange efficiency.

[0020] Preferably, the diameters of the upper tube holes and the lower tube holes are 14mm-16mm, the center spacing of the lower tube holes and the upper tube holes is 20mm-24mm, and the center spacing between adjacent lower tube holes is 38-42mm; or the diameters of the upper tube holes and the lower tube holes are 15mm-17mm, the center spacing of the lower tube holes and the upper tube holes is 20mm-24mm, and the center spacing between adjacent lower tube holes is 36-40mm.

[0021] A heat exchanger comprises a heat exchange tube and a plurality of heat exchange fins, wherein the heat exchange tube is connected in series in the upper tube holes or the lower tube holes of a plurality of the heat exchange fins.

[0022] A water heater comprises the heat exchange fins.

[0023] The positive improvement effect of the present invention is that when the reduction in heat exchange efficiency (compared to not setting up an isolated hollow area) is relatively small, it is not easy for an over-temperature area to appear in the heat exchange fins, thereby avoiding oxidation and even damage of the heat exchange fins after a long period of time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the heat exchange fin of Example 1 of the present invention.

[0025] Figure 2 This is a schematic diagram of the front structural view of the heat exchange fin of Example 1 of the present invention.

[0026] Figure 3 This is a schematic diagram of the structure of the isolated hollowed-out area of ​​Example 1 of the present invention.

[0027] Figure 4 This is a surface temperature cloud diagram of the heat exchange fins of Example 1 of the present invention.

[0028] Figure 5 This is a cross-sectional temperature cloud diagram of the heat exchange fin of Example 1 of the present invention.

[0029] Figure 6It is a schematic diagram of the three-dimensional structure of the heat exchange fin of Example 2 of the present invention.

[0030] Figure 7 This is a schematic diagram of the main structure of the heat exchange fin of Example 2 of the present invention.

[0031] Figure 8 This is a surface temperature cloud diagram of the heat exchange fins of Example 2 of the present invention.

[0032] Fig. 9 This is a cross-sectional temperature cloud diagram of the heat exchange fin of Example 2 of the present invention.

[0033] Fig.10 It is a schematic diagram of the three-dimensional structure of the heat exchange fin of Example 3 of the present invention.

[0034] Fig.11 This is a schematic diagram of the front structural view of the heat exchange fin of Example 3 of the present invention.

[0035] Fig.12 This is a surface temperature cloud diagram of the heat exchange fins of Example 3 of the present invention.

[0036] Fig.13 This is a cross-sectional temperature cloud diagram of the heat exchange fin of Example 3 of the present invention.

[0037] Fig.14 It is a schematic diagram of the main structure of the heat exchange fin of the control example.

[0038] Description of Reference Numerals

[0039] Lower layer pipe hole 100

[0040] Upper pipe hole 200

[0041] Isolate and seal the hollowed-out area 300

[0042] Area Edge 310

[0043] Interval flange 410

[0044] Round flange 420

[0045] Horizontal Flanging 510

[0046] Flanging 520

[0047] Flanging 530

[0048] Vertical Flanging 610

[0049] Bevel flange 620

[0050] Diameter A

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

[0052] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0053] like Figure 1-Figure 13 In the shown embodiments 1 to 3, the present invention discloses a heat exchange fin, comprising upper tube holes 200 and lower tube holes 100 which are distributed up and down and arranged in an alternating manner, and the upper tube holes 200 and the lower tube holes 100 are arranged in parallel, wherein a semi-closed or closed isolation hollow area 300 is provided between two adjacent lower tube holes 100 and upper tube holes 200, wherein the boundary of the isolation hollow area 300 includes at least several sections of three area edges 310 which are adjacent to and correspond to the upper tube holes 200 or the lower tube holes 100, and the area edges 310 are straight lines and / or curves, and the distance of the area edges 310 relative to the center of the corresponding upper tube holes 200 or the lower tube holes 100 is within the range of 1.3 to 2.2 times the radius of the corresponding upper tube holes 200 or the lower tube holes 100.

[0054] In the present invention, the isolated hollowed-out area 300 is located between the tube holes (in the space enclosed by the triangle formed by two lower tube holes 100 and one upper tube hole 200). The isolated hollowed-out area 300 itself can have various geometric shapes, but the main body is composed of three sections of regional edges 310. The three sections of regional edges 310 respectively correspond to two adjacent upper tube holes 200 and one lower tube hole 100, that is, they correspond to the distance between the upper tube hole 200 and the lower tube hole 100. For example, the regional edge 310 that is closest to the upper tube hole 200 as a whole corresponds to the upper tube hole 200. Combined with Figure 1 For example, the upper area edge 310 of the inverted triangle shape of the left isolated hollow area 300 corresponds to the upper layer tube hole 200 above, the left area edge 310 below the inverted triangle shape corresponds to the lower layer tube hole 100 on the left, and the right area edge 310 below the inverted triangle shape corresponds to the lower layer tube hole 100 on the right.

[0055] In some embodiments, the three-segment area edge 310 can directly form a semi-open isolation hollow area 300, or a triangular isolation hollow area 300, but in some other embodiments, it is not excluded that the isolation hollow area 300 includes some other auxiliary edges in addition to the three-segment area edge 310, but these other auxiliary edges should not change the overall shape formed by the three-segment area edge 310. For example, these auxiliary edges are only edges that are easy to process or crack in a certain way (such as chamfers at corners, arc transitions, etc.) added for process needs, or are connected between two sections of the area edge 310 corresponding to the lower layer pipe hole 100 in order to close the hollow area 300, etc., and the basic purpose that can be achieved by the present invention can be reasonably achieved.

[0056] In the present invention, the distance between the area edge 310 and the center of the corresponding upper tube hole 200 or lower tube hole 100 is within the range of 1.3 to 2.2 times the radius of the corresponding upper tube hole 200 or lower tube hole 100, that is, the distance S between the position of the area edge 310 and the corresponding upper tube hole 200 or lower tube hole 100 needs to be within a certain range. For example, when the radius of the upper tube hole 200 is 8 mm, if S=10.4 mm is obtained according to the range of 1.3 times the radius, that is, the distance S between the area edge 310 corresponding to the upper tube hole 200 and the upper tube hole 200 is 10.4 mm. If the range is 2.2 times the radius, the distance between the area edge 310 corresponding to the upper tube hole 200 and the upper tube hole 200 is 17.6 mm. Specifically, for the selection of 1.3 to 2.2 times, a suitable range can be selected according to the distance between the upper tube hole 200 and the lower tube hole 100, or the distance between the lower tube holes 100. The distance (spacing S) between the area edge 310 and the center of the corresponding upper layer tube hole 200 or lower layer tube hole 100 can be determined geometrically, for example, as Figure 3 As shown, when the area edge 310 is a straight line, the arc drawn through the center of the corresponding upper tube hole 200 or lower tube hole 100 is tangent to the area edge 310, and the radius of the tangent arc is the spacing S. When the area edge 310 is a curve, such as an arc, the ideal situation is to ensure that the radius of the area edge 310 is set according to the spacing S, and the center is the corresponding upper tube hole 200 or lower tube hole 100. Of course, when the area edge 310 is a curve, the arc drawn through the center of the corresponding upper tube hole 200 or lower tube hole 100 can also be tangent to the area edge 310, and the radius of the tangent arc is the spacing S.

[0057] In the present invention, according to actual needs, appropriate distances can be reserved by the center spacing between the upper tube holes 200 and the lower tube holes 100 and the center spacing between the lower tube holes 100 to ensure that the heat exchange efficiency meets higher requirements and the smoke resistance is small. On this basis, by taking the spacing and diameter of the upper tube holes 200 and the lower tube holes 100 as references, the boundaries of the isolated hollow area 300 are reasonably set, so that when the reduction in heat exchange efficiency (the reduction is compared to the case where the isolated hollow area 300 is not set) is relatively small, it is not easy to have an over-high temperature area in the heat exchange fins, thereby avoiding oxidation and damage of the heat exchange fins after a long time.

[0058] like Figure 1-Figure 13 As shown, in a preferred embodiment, the intersection of the regional edges 310 is processed by arc transition or chamfering. The arc or chamfer can avoid stress concentration in the intersection area of ​​the regional edges 310, ensuring the integrity of the heat exchange fin during processing.

[0059] like Figure 1-Figure 13 As shown, in a preferred embodiment, the two sides of the heat exchange fin corresponding to the upper tube hole 200 at the upper part are inwardly retracted oblique flanges 620, and the two sides of the heat exchange fin corresponding to the lower tube hole 100 at the lower part are vertical flanges 610, and the oblique flanges 620 and the vertical flanges 610 are bent separately or as a whole. The oblique flanges 620 help to gather the rising smoke and improve the heat exchange efficiency.

[0060] The heat exchange fins of the present invention can be used in a heat exchanger, especially in a heat exchanger of a water heater. The heat exchanger comprises a heat exchange tube and a plurality of heat exchange fins, wherein the heat exchange tube is connected in series in the upper tube holes 200 or the lower tube holes 100 of the plurality of heat exchange fins.

[0061] Example 1

[0062] like Figure 1-Figure 3 As shown, the regional edge 310 of this embodiment is roughly inverted triangle, and the regional edge 310 corresponding to the upper tube hole 200 is connected with the regional edge 310 corresponding to the lower tube hole 100 on both sides, and the regional edges 310 corresponding to the lower tube hole 100 on both sides are directly connected or connected through transition edges to form a fully enclosed isolation hollowing area 300. The areas hollowed out by the fully enclosed isolation hollowing area 300 are all areas where the temperature is relatively concentrated, that is, areas that are relatively far away from the upper tube hole 200 and the lower tube hole 100. At the same time, the area occupied by the fully enclosed isolation hollowing area 300 is less than the material removed by the semi-enclosed setting, so the loss in heat exchange efficiency is also less, 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 spacing of the lower tube is close, the area edges 310 corresponding to the lower tube hole 100 are connected to each other, which can reduce the amount of material removed. On the one hand, the heat exchange efficiency is ensured by reducing the material removal, and on the other hand, the lower tube holes 100 are allowed to be closer to each other to ensure the heat exchange efficiency.

[0063] like Figure 1-Figure 3 As shown, the distance (spacing S) between the edge 310 of each region and the center of the corresponding lower tube hole 100 of this embodiment is respectively within the range of 1.8 to 2.2 times the radius of the corresponding lower tube hole 100, and the distance (spacing S) between the edge 310 of each region and the center of the corresponding upper tube hole 200 is respectively within the range of 1.3 to 1.7 times the radius of the corresponding upper tube hole 200. Since the heat in the high-temperature flue gas will become smaller when it reaches the upper layer after being absorbed by the lower layer, more area is not needed to absorb heat. Therefore, the edge 310 of the region corresponding to the upper tube hole 200 can be closer to the upper tube hole 200 to expand the area of ​​the isolated hollowed-out region 300, and at the same time, it can also have less impact on the heat exchange efficiency.

[0064] like Figure 1-Figure 3 As shown, the edge 310 of each region in this embodiment is a straight line, and of course it can also be set as a curve or a combination of a straight line and a curve as needed. The arc drawn through the center of the corresponding upper tube hole 200 or lower tube hole 100 is tangent to the edge 310 of the region, and the radius of the tangent arc is the spacing S, that is, the distance between the edge 310 of each region and the center of the corresponding upper tube hole 200 or lower tube hole 100. In simpler terms, a perpendicular line is drawn from the center of the corresponding upper tube hole 200 or lower tube hole 100 to the edge 310 of the region, and the line segment distance of the perpendicular line is the spacing S.

[0065] like Figure 1-Figure 3 As shown, a spacing flange 410 is provided between one or both sides of the isolation hollowing area 300 of this embodiment and the corresponding lower tube hole 100, and the spacing flange 410 has an extension tendency inclined to one side upward. The extension tendency of the spacing flange 410 allows it to be separated along the lower tube hole 100 and the isolation hollowing area 300, thereby isolating the flue gas on both sides of the spacing flange 410, that is, the lower tube hole 100 and the isolation hollowing area 300 to a certain extent, thereby guiding the flue gas from the lower layer to the middle to the upper tube hole 200 of the upper layer, increasing the flue gas flow rate, so that the flue gas flowing through the lower tube hole 100 and the flue gas flowing from the isolation hollowing area 300 to the upper tube hole 200 can be efficiently heat exchanged respectively, reducing the low-temperature flue gas after heat exchange by the lower heat exchange tube to affect the heat exchange efficiency of the upper heat exchange tube. The spacing flange 410 of this embodiment is substantially parallel to the adjacent area edge 310. Of course, in other embodiments, it can also be set to be non-parallel. The spacing flange 410 may be as follows Figure 1-Figure 3 The straight strip shape shown in the figure may also be an integral form composed of multiple circular flanges such as in Example 2, or other forms with a certain length of isolation.

[0066] like Figure 1-Figure 3 As shown, the spacing flange 410 of this embodiment is formed by bending the material cut from the punching holes on the heat exchange fins. In this way, the heat exchange fins can be integrally formed. Of course, in other embodiments, the spacing flange 410 can also be fixed to the heat exchange fins 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 the stacking process of multiple heat exchange fins by excessively high spacing flanges. The length of the spacing flange 410, that is, the length inclined along the upward side, is 4mm-12mm. A spacing flange 410 that is too short will affect the effect of isolating the flue gas, and a spacing flange that is too long will result in more material being punched out, that is, the formed hole is larger, which will have a certain impact on the heat exchange efficiency.

[0067] like Figure 1-Figure 3As shown, the intersection of the regional edges 310 of this embodiment is processed by arc transition or chamfering. The arc or chamfer can avoid stress concentration in the intersection area of ​​the regional edges 310, ensuring the integrity of the heat exchange fin during processing.

[0068] like Figure 1-Figure 3 As shown, the heat exchange fins of this embodiment have inwardly retracted oblique flanges 620 on both sides of the corresponding upper tube holes 200, and the heat exchange fins have vertical flanges 610 on both sides of the corresponding lower tube holes 100, and the oblique flanges 620 and the vertical flanges 610 are bent respectively. The oblique flanges 620 help to gather the rising flue gas and improve the heat exchange efficiency. In addition, in this embodiment, horizontal flanges 510, flanges 520 and flanges 530 can be further provided to further guide the flue gas. The horizontal flange 510 can prevent the flue gas from coming up from below from rushing straight into and flowing out of the heat exchange fins, thereby increasing the flue gas flow rate and improving the heat exchange efficiency. The spacing flange 410 and the horizontal flange 510 are arranged together around the lower tube hole 100, so that the flue gas on both sides of the spacing flange 410 and the horizontal flange 510, that is, the lower tube hole 100 and the isolation hollow area 300 are isolated to a certain extent, so that the flue gas flowing through the lower tube hole 100 and the flue gas flowing from the isolation hollow area 300 to the upper tube hole 200 can respectively perform efficient heat exchange, thereby reducing the low-temperature flue gas after heat exchange by the lower heat exchange tube to affect the heat exchange efficiency of the upper heat exchange tube.

[0069] like Figure 1-Figure 3 As shown, in this embodiment, the diameter A of the upper tube hole 200 and the lower tube hole 100 is preferably 14mm-16mm, the center distance C of the lower tube hole 100 and the upper tube hole 200 is 20mm-24mm, and the center distance B between adjacent lower tube holes 100 is 38-42mm.

[0070] like Figure 4 and Figure 5 As shown, in this embodiment, the diameters A of the upper tube holes 200 and the lower tube holes 100 are both 15 mm, the center spacing C of the lower tube holes 100 and the upper tube holes 200 is 22 mm, the center spacing B between adjacent lower tube holes 100 is 40 mm, the spacing S between the area edge 310 and the center of the corresponding upper tube hole 200 is 1.5 times the radius of the corresponding upper tube hole 200, and the spacing S between the area edge 310 and the center of the corresponding lower tube hole 100 is 2 times the radius of the corresponding lower tube hole 100. Figure 4 The figure shows the surface temperature cloud map of the heat exchange fins. It can be seen that the colors from red to blue on the left represent the temperature from high to low. Figure 4 The stable color of the heat exchange fin surface is relatively uniform, that is, there is basically no red or yellow, indicating that the heat is not very concentrated. Figure 5Zhong Gang represents the cross-sectional temperature cloud diagram of the heat exchange fin, which shows the overall temperature of the internal flue gas. Due to the setting of the relevant flange, it can be clearly seen that the high-temperature flue gas below the upper tube hole 200 can directly exchange heat with the heat exchange tube at the upper tube hole 200, thereby improving the heat exchange efficiency. In general, the thermal efficiency that can be achieved is 89.14% while avoiding severe oxidation of the heat exchange fins. Thermal efficiency is a basic performance requirement for heat exchangers or water heaters. On the one hand, thermal efficiency is determined by whether the combustion in the combustion chamber is sufficient. On the other hand, the resistance of the heat exchanger also affects the thermal efficiency; the higher the efficiency, the better, which means that the heat exchange of the heat exchanger is more sufficient, and the exhaust temperature will be lower. Among them, when the performance of the combustion chamber is consistent, the smaller the resistance of the heat exchanger (that is, the higher the heat exchange efficiency), the higher the thermal efficiency.

[0071] like Fig.14 Shown is the heat exchange fin of the control example. Fig.14 The heat exchange fins shown in the figure are substantially the same in size and shape as the heat exchange fins of this embodiment, the main difference being that Fig.14 The heat exchange fins in the heat exchanger do not have an isolated hollow area. Therefore, in actual use, Fig.14 The heat in the middle area of ​​the heat exchange fins is concentrated, and it will oxidize and turn black in long-term use. At the same time, when other test conditions are basically the same as those in this embodiment, Fig.14 The heat exchange fins of the embodiment can achieve a thermal efficiency of 90%, and the heat exchange fins of the embodiment can achieve a thermal efficiency close to this index. Therefore, it can be seen that the embodiment can avoid oxidation and blackening of the heat exchange fins while maintaining the heat exchange efficiency basically the same.

[0072] Example 2

[0073] like Figure 6 and Figure 7 As shown, the regional edge 310 of this embodiment is roughly in the shape of a semi-open long strip. The regional edge 310 corresponding to the upper tube hole 200 of this embodiment is respectively connected with the regional edge 310 corresponding to the lower tube hole 100 on both sides, and the regional edges 310 corresponding to the lower tube holes 100 on both sides are separated from each other to form a semi-enclosed isolation hollowed-out area 300. The isolation hollowed-out area 300 thus realized is located between the lower tube holes 100 on both sides, and the hollowing out can more completely remove the area prone to local temperature concentration, thereby making the heat exchange fins less likely to be damaged.

[0074] like Figure 6 and Figure 7As shown, the distance (spacing S) between the edge 310 of each region and the center of the corresponding upper tube hole 200 or lower tube hole 100 in this embodiment is within the range of 1.8 to 2.2 times the radius of the corresponding upper tube hole 200 or lower tube hole 100. This ensures that the regions far from the upper tube hole 200 and the lower tube hole 100 are hollowed out. This avoids the heat concentration caused by the existence of a solid part far from the upper tube hole 200 and the lower tube hole 100, and further avoids oxidation damage to the heat sink fins.

[0075] like Figure 6 and Figure 7 As shown, the edges 310 of each region in this embodiment are arcs centered on the corresponding upper tube hole 200 or lower tube hole 100, that is, arcs centered on the center of the upper tube hole 200 or lower tube hole 100. This arrangement can more evenly divide and hollow out the areas where the temperature is prone to be too high, and also facilitates the processing and design of the heat exchange fins.

[0076] like Figure 6 and Figure 7 As shown, a horizontal flange 510 is provided between the lower tube hole 100 and the upper tube hole 200 of this embodiment, and a circular flange 420 is provided between the lower tube hole 100, the isolation hollow area 300, the lower tube hole 100 and the horizontal flange 510. The horizontal flange 510 can prevent the flue gas from coming up from below from directly rushing and flowing out of the heat exchange fins, thereby increasing the flue gas flow rate and improving the heat exchange efficiency. The circular flange 420 and the horizontal flange 510 are arranged together around the lower tube hole 100, so that the flue gas on both sides of the circular flange 420 and the horizontal flange 510, that is, the flue gas in the lower tube hole 100 and the isolation hollow area 300 is isolated to a certain extent, so that the flue gas flowing through the lower tube hole 100 and the flue gas flowing from the isolation hollow area 300 to the upper tube hole 200 can be efficiently heat exchanged respectively, reducing the low-temperature flue gas after heat exchange by the lower heat exchange tube affecting the heat exchange efficiency of the upper heat exchange tube.

[0077] like Figure 6 and Figure 7 As shown, the intersection of the regional edges 310 of this embodiment is processed by arc transition or chamfering. The arc or chamfer can avoid stress concentration in the intersection area of ​​the regional edges 310, ensuring the integrity of the heat exchange fin during processing.

[0078] like Figure 6 and Figure 7As shown, the heat exchange fins of this embodiment are located at the upper part of the corresponding upper layer tube hole 200 with inwardly retracted oblique flanges 620 on both sides, and the heat exchange fins are located at the lower part of the corresponding lower layer tube hole 100 with vertical flanges 610 on both sides, and the oblique flanges 620 and the vertical flanges 610 are bent as a whole. The oblique flanges 620 help to gather the rising smoke and improve the heat exchange efficiency. The overall bent oblique flanges 620 and vertical flanges 610 can better gather the smoke and improve the heat exchange efficiency.

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

[0080] like Figure 8 and Fig. 9 As shown, in this embodiment, the diameter A of the upper tube hole 200 and the lower tube hole 100 are both 15 mm, the center distance C of the lower tube hole 100 and the upper tube hole 200 is 22 mm, the center distance B between adjacent lower tube holes 100 is 40 mm, and the distance S between the area edge 310 and the center of the corresponding upper tube hole 200 and lower tube hole 100 is twice the radius of the corresponding upper tube hole 200 and lower tube hole 100. Figure 8 The figure shows the surface temperature cloud map of the heat exchange fins. It can be seen that the colors from red to blue on the left represent the temperature from high to low. Figure 8 The stable color of the heat exchange fin surface is relatively uniform, that is, there is basically no red or yellow, indicating that the heat is not very concentrated. Fig. 9 The middle part shows the cross-sectional temperature cloud diagram of the heat exchange fin, which shows the overall temperature of the internal flue gas. Due to the setting of the relevant flange, it can be clearly seen that the high-temperature flue gas below the upper tube hole 200 can directly exchange heat with the heat exchange tube at the upper tube hole 200, thereby improving the heat exchange efficiency. In general, the thermal efficiency can reach 89.05% without serious oxidation of the heat exchange fin.

[0081] Example 3

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

[0083] like Fig.12 and Fig.13 As shown, in this embodiment, the diameters A of the upper tube holes 200 and the lower tube holes 100 are both 16 mm, the center spacing C of the lower tube holes 100 and the upper tube holes 200 is 22 mm, the center spacing B between adjacent lower tube holes 100 is 38 mm, and the spacing S between the area edge 310 and the center of the corresponding upper tube holes 200 and lower tube holes 100 is twice the radius of the corresponding upper tube holes 200 and lower tube holes 100. Fig.12 The figure shows the surface temperature cloud map of the heat exchange fins. It can be seen that the colors from red to blue on the left represent the temperature from high to low. Fig.12 The stable color of the heat exchange fin surface is relatively uniform, that is, there is basically no red or yellow, indicating that the heat is not very concentrated. Fig.13 The middle part shows the cross-sectional temperature cloud diagram of the heat exchange fin, which shows the overall temperature of the internal flue gas. Due to the setting of the relevant flange, it can be clearly seen that the high-temperature flue gas below the upper tube hole 200 can directly exchange heat with the heat exchange tube at the upper tube hole 200, thereby improving the heat exchange efficiency. In general, under the condition of avoiding severe oxidation of the heat exchange fin, the thermal efficiency can reach 89.86%, which is closer to that of Example 1. Fig.14 Thermal efficiency of the heat exchange fins shown.

[0084] The present invention makes it less likely for an over-temperature region to appear in the heat exchange fins when the reduction in heat exchange efficiency (compared to not setting the isolation hollow area 300) is relatively small, thereby avoiding oxidation and damage of the heat exchange fins after a long period of time.

[0085] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A heat exchange fin, comprising upper tube holes and lower tube holes which are distributed and arranged in an alternating manner, wherein the upper tube holes and the lower tube holes are arranged in parallel, characterized in that: A semi-enclosed or enclosed isolation hollow area is provided between two adjacent lower-layer tube holes and upper-layer tube holes, wherein the boundary of the isolation hollow area includes at least three sections of area edges that are adjacent to and corresponding to the upper-layer tube holes or the lower-layer tube holes, and the area edges are straight lines and / or curves, and the distance of the area edges relative to the center of the corresponding upper-layer tube hole or the lower-layer tube hole is within the range of 1.3 to 2.2 times the radius of the corresponding upper-layer tube hole or the lower-layer tube hole.

2. The heat exchange fin according to claim 1, characterized in that: The edges of the area corresponding to the upper tube holes are respectively connected with the edges of the area corresponding to the lower tube holes on both sides, and the edges of the area corresponding to the lower tube holes on both sides are separated from each other to form a semi-enclosed isolation hollow area.

3. The heat exchange fin according to claim 2, characterized in that: The distance between the edge of each region and the center of the corresponding upper layer tube hole or the lower layer tube hole is within a range of 1.8 to 2.2 times the radius of the corresponding upper layer tube hole or the lower layer tube hole.

4. The heat exchange fin according to claim 3, characterized in that: Each of the area edges is an arc centered on the corresponding upper layer tube hole or the lower layer tube hole.

5. The heat exchange fin according to claim 4, characterized in that: A horizontal flange is provided between the lower layer tube hole and the upper layer tube hole, and a circular flange is provided between the lower layer tube hole, the isolation hollowed-out area, the lower layer tube hole and the horizontal flange.

6. The heat exchange fin according to claim 1, characterized in that: The edges of the area corresponding to the upper tube holes are respectively connected with the edges of the area corresponding to the lower tube holes on both sides, and the edges of the area corresponding to the lower tube holes on both sides are directly connected or connected through transition edges to form a fully enclosed isolation hollow area.

7. The heat exchange fin according to claim 6, characterized in that: The distance between the edge of each area and the center of the corresponding lower layer tube hole is within the range of 1.8 to 2.2 times the radius of the corresponding lower layer tube hole, and the distance between the edge of each area and the center of the corresponding upper layer tube hole is within the range of 1.3 to 1.7 times the radius of the corresponding upper layer tube hole.

8. The heat exchange fin according to claim 7, characterized in that: The edge of each region is a straight line, a curve, or a combination of a straight line and a curve.

9. The heat exchange fin according to claim 6, characterized in that: A spacing flange is provided between one side or both sides of the isolation hollowing area and the corresponding lower layer pipe hole, and the spacing flange has a tendency to extend inclined upward.

10. The heat exchange fin according to claim 9, characterized in that: The spacing flange is formed by bending the material cut from the punching holes on the heat exchange fins.

11. The heat exchange fin according to claim 9, characterized in that: The length of the interval flange is 4mm-12mm.

12. The heat exchange fin according to claim 1, characterized in that: The intersections of the edges of the regions are processed by arc transition or chamfering.

13. The heat exchange fin according to claim 1, characterized in that: The two sides of the upper portion of the heat exchange fin corresponding to the upper tube hole are inwardly retracted oblique flanges, and the two sides of the lower portion of the heat exchange fin corresponding to the lower tube hole are vertical flanges, and the oblique flanges and the vertical flanges are bent separately or as a whole.

14. The heat exchange fin according to any one of claims 1 to 13, characterized in that: The diameters of the upper tube holes and the lower tube holes are 14mm-16mm, the center spacing between the lower tube holes and the upper tube holes is 20mm-24mm, and the center spacing between adjacent lower tube holes is 38-42mm; or the diameters of the upper tube holes and the lower tube holes are 15mm-17mm, the center spacing between the lower tube holes and the upper tube holes is 20mm-24mm, and the center spacing between adjacent lower tube holes is 36-40mm.

15. A heat exchanger, characterized in that: The heat exchanger comprises a heat exchange tube and a plurality of heat exchange fins according to any one of claims 1 to 14, wherein the heat exchange tube is connected in series in the upper tube holes or the lower tube holes of a plurality of the heat exchange fins.

16. A water heater, characterized in that: The water heater comprises the heat exchange fin according to any one of claims 1-14.

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