A kind of easy-to-process circular tube heat exchanger fin and heat exchanger

Abstract

The utility model provides an easy processing's circular tube heat exchanger fin, including fin main part and set up in fin main part and extend upwards flanging structure, fin main part includes windward side and leeward side, windward side is in the heat transfer process the side to fluid, leeward side is located opposite with windward side, windward side is equipped with a plurality of first connecting through -hole, first connecting through -hole interval sets along fin main part length direction, leeward side is equipped with a plurality of second connecting through -hole, second connecting through -hole interval sets along fin main part length direction and the center of circle of second connecting through -hole is located between the center of circle of adjacent two first connecting through -hole in length direction, flanging structure includes the side face support flanging of first connecting through -hole side face being arranged in both ends and the tail part flow guide flanging of second connecting through -hole outside, and the side face support flanging is equipped with first air outlet between adjacent tail part flow guide flanging, is used for flowing out after heat transfer fluid.

Description

Technical Field

[0001] This utility model belongs to the technical field of heat exchanger equipment, specifically relating to an easily machinable circular tube heat exchanger fin and heat exchanger. Background Technology

[0002] Currently, the commonly used heat transfer tubes adopt a single-row arrangement of multiple tubes in series / parallel, with both ends connected to the water chamber. Most of the heat transfer tubes are elliptical tubes and flat elliptical tubes. However, the structure of elliptical tubes and flat elliptical tubes is flat, and the heat flux density is high on the side close to the flue gas, which can easily cause local vaporization and generate noise. Therefore, special turbulence plates need to be designed to suppress vaporization during use, which makes the structure more complex.

[0003] Furthermore, to enhance the heat transfer effect through turbulence, heat exchangers increase the area and number of fins and incorporate complex turbulence structures on the fin surface. This increases the difficulty of mold manufacturing and stamping, especially for stainless steel heat exchange fins. Stainless steel has poor ductility, and the processing of complex turbulence structures requires extremely high manufacturing standards. When used with elliptical or flat elliptical heat transfer tubes, it can easily lead to large tolerances in the gap between the fins and the heat transfer tubes. The connection between the fins and the heat transfer tubes also requires a lot of welding, thus limiting the yield rate and increasing the cost.

[0004] Therefore, it is necessary to improve the structure of the heat exchange fins and heat exchanger. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a circular tube heat exchanger fin and heat exchanger that are easy to process and have good heat exchange effect.

[0006] This utility model provides an easy-to-process circular tube heat exchanger fin, the fin including a fin body and a flange structure disposed on the fin body and extending upward;

[0007] The fin body includes a windward side and a leeward side. The windward side is the side facing the fluid during heat transfer, and the leeward side is arranged opposite to the windward side. The windward side has a plurality of first connecting through holes, which are spaced apart along the length of the fin body. The leeward side has a plurality of second connecting through holes, which are spaced apart along the length of the fin body, and the center of the second connecting through hole is located between the centers of two adjacent first connecting through holes in the length direction.

[0008] The flange structure includes a side support flange disposed on the side of the first connecting through hole at both ends and a tail guide flange disposed on the outside of the second connecting through hole. A first air outlet is provided between the side support flange and the adjacent tail guide flange for the flow of heat-transferring fluid.

[0009] Preferably, the tail guide flange is disposed on the edge of the leeward side and has at least one second air outlet and at least one third air outlet, wherein the second air outlet is opposite to the center of the second connecting through hole and the third air outlet is opposite to the center of the first connecting through hole.

[0010] Preferably, the distance between adjacent first connecting through holes and second connecting through holes is L1, the opening width of the second air outlet in the fin length direction is L2, and the opening width of the third air outlet in the fin length direction is L3. L1, L2 and L3 satisfy the following relationship: L2 = (0.35-0.45)L1; L3 = (0.3-0.4)L1.

[0011] Preferably, in the width direction of the fin, the first air outlet is located between the center of the adjacent first connecting through hole and the center of the adjacent second connecting through hole; in the length direction of the fin, the first air outlet is located outside the center of the adjacent first connecting through hole.

[0012] The opening width of the first air outlet in the length direction of the fin is L4, and the distance between adjacent first connecting through holes and second connecting through holes is L1. L1 and L4 satisfy the following relationship: L4 = (0.3-0.4)L1.

[0013] Preferably, the total number of the first connecting through hole and the second connecting through hole is 5, 7 or 9, wherein the number of the first connecting through hole is greater than the number of the second connecting through hole.

[0014] Preferably, the fin body has a first partition between two adjacent first connecting through holes, and the fin body has a second partition between two adjacent second connecting through holes, the first partition extending toward the second connecting through hole, and the second partition extending toward the first connecting through hole.

[0015] Preferably, the flange structure further includes a heat transfer tube flange surrounding the edges of the first connecting through hole and the second connecting through hole, the height of the heat transfer tube flange being H2, and the thickness of the fin being H1. H1 and H2 satisfy the following relationship:

[0016] H2:H1 = (1.0-1.2):0.3.

[0017] Preferably, the height of the side support flange is H3, the height of the tail guide flange is H4, and the thickness of the fin is H1. H1, H3, and H4 satisfy the following relationship:

[0018] H3:H1=(1.0-1.2):0.3;

[0019] H4:H1 = (1.0-1.2):0.3.

[0020] This utility model also provides a heat exchanger, which includes a heat transfer tube and at least two stacked fins as described in any of the above claims. The heat transfer tube is disposed in the first connecting through hole and the second connecting through hole and is fixedly connected to the fin body. The outer diameter of the heat transfer tube corresponds to the inner diameter of the first connecting through hole and the second connecting through hole.

[0021] In the thickness direction of the heat exchanger, the spacing between two adjacent fins is greater than the height of the tail guide flange, so that a fourth air outlet is formed between two adjacent fins.

[0022] Preferably, the height of the tail guide flange is H4, and the distance between two adjacent fins is H5. H4 and H5 satisfy the following relationship: H4:H5 = 0.8-0.9;

[0023] The outer diameter of the heat transfer tube is 15-16mm, the center distance between two adjacent heat transfer tubes in the same row is 28-30mm, and the center width of two adjacent heat transfer tubes in different rows in the width direction of the fins is 17-19mm.

[0024] Compared to existing technologies, the easily machinable circular tube heat exchanger fins and heat exchanger of this solution have at least the following advantages:

[0025] 1. The circular tube heat exchanger fins provided in this solution are arranged in a double-row cross arrangement with first and second connecting through holes for installing heat transfer tubes. When the fluid flows over the fin surface, turbulence is formed due to the turbulence of the heat transfer tubes themselves, which enhances the heat exchange effect. Furthermore, by setting side support flanges and tail guide flanges on both sides and the leeward side of the fins, the fluid can flow evenly over the surface of the heat transfer tubes for heat exchange. There is no need to set complex turbulence structures on the fin surface, and the processing difficulty is low.

[0026] 2. Another solution to this application provides a heat exchanger that limits the height of the tail guide flange, so that a fourth air outlet is formed between two adjacent stacked fins, which can quickly discharge the low-temperature fluid after heat exchange, reduce the resistance to fluid flow, and make the fluid heat exchange process smooth. Attached Figure Description

[0027] The above and other objects, features, and advantages of this invention will become clearer through a more detailed description of the preferred embodiments shown in the accompanying drawings. The same reference numerals indicate the same parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the gist of this invention.

[0028] Figure 1This is a schematic diagram of the structure of a heat exchanger provided in an embodiment of the present utility model;

[0029] Figure 2 This is a structural schematic diagram of the heat exchanger from another angle provided in an embodiment of the present utility model;

[0030] Figure 3 A top view of the fins of a circular tube heat exchanger provided in an embodiment of this utility model;

[0031] Figure 4 A schematic diagram of the windward side of the heat exchanger provided in an embodiment of this utility model;

[0032] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0033] Figure 6 A schematic diagram of the leeward side of the heat exchanger provided in an embodiment of this utility model;

[0034] Figure 7 for Figure 6 Enlarged view of point B in the middle.

[0035] Reference numerals: 10-fin, 101-fin body, 102-flanged structure, 103-windward side, 104-leeward side, 105-first connecting through hole, 106-second connecting through hole, 107-side support flange, 108-tail guide flange, 109-first air outlet, 110-second air outlet, 111-third air outlet, 112-first partition, 113-second partition, 114-heat transfer tube flange, 115-fourth air outlet, 20-heat transfer tube. Detailed Implementation

[0036] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand this utility model and implement it. However, the embodiments are not intended to limit this utility model. In this embodiment, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this utility model.

[0037] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to and integrated with the other element, or there may be an intervening element present. The terms "mounted," "one end," "the other end," and similar expressions used in this invention are for illustrative purposes only.

[0038] In gas-fired water heaters or gas-fired heating boilers, high-temperature flue gas generated by gas combustion exchanges heat with a heat exchanger to continuously heat the cold water in the pipeline. Therefore, the heat exchange efficiency between the high-temperature flue gas and the heat exchanger determines the efficiency of the equipment in producing hot water and its energy consumption. The finned heat exchanger provided in this solution is a tube-plate heat exchanger. During the time the high-temperature flue gas flows through the heat exchanger, it exchanges heat with the fins and heat transfer tubes. The cooled flue gas after heat exchange flows out from the other side of the heat exchanger and is discharged from the equipment, thus completing the water heating operation.

[0039] Please refer to Figures 1-7 This utility model provides an easy-to-process circular tube heat exchanger fin 10. The fin 10 includes a fin body 101 and a flange structure 102 disposed on the fin body 101 and extending upward. It can be understood that the upward extension of the flange structure 102 is relative to the thickness direction of the fin body 101, that is, the flange structure 102 protrudes relative to the surface of the fin body 101, as shown in the figure in the upward direction. In actual use, the fin 10 can be arranged in different directions according to the actual situation. At this time, the orientation of the flange structure 102 also changes with the direction of the fin 10, and is not limited to the upward extension in the vertical direction.

[0040] The fin body 101 includes a windward side 103 and a leeward side 104. The windward side 103 is the side facing the fluid during heat transfer, and the leeward side 104 is arranged opposite to the windward side 103. The windward side 103 has a plurality of first connecting through holes 105, which are spaced apart along the length of the fin body 101. The leeward side 104 has a plurality of second connecting through holes 106, which are spaced apart along the length of the fin body 101. The center of 106 is located between the centers of two adjacent first connecting through holes 105 in the longitudinal direction. Understandably, in actual use, high-temperature flue gas enters from one side of the fin 10, undergoes heat exchange as it flows through the fin 10, and exits from the other side. The side of the fin body 101 facing the high-temperature flue gas is the windward side 103, and the other side from which the low-temperature flue gas exits after heat exchange is the leeward side 104. The windward side 103 is provided with a row of spaced-apart first connecting through holes 105. The leeward side 104 is provided with a row of spaced second connecting through holes 106. The first connecting through holes 105 and the second connecting through holes 106 penetrate the fin body 101 in the thickness direction of the fin 10, and both are used to connect the heat transfer tube 20. The first connecting through holes 105 and the second connecting through holes 106 are arranged in a cross manner. The center of the second connecting through hole 106 is located between the centers of two adjacent first connecting through holes 105. That is, in the length direction of the fin 10, the second connecting through hole 106 is located in the gap between the two first connecting through holes 105. With this arrangement, when the high-temperature flue gas enters from the windward side 103, it will flow along the edge of the heat transfer tube 20 where the first connecting through hole 105 is located and the gap between them, and then collide with the heat transfer tube 20 where the second connecting through hole 106 is located. This causes the high-temperature flue gas to form turbulence in the fin 10, so that the high-temperature flue gas can fully exchange heat with the heat transfer tube 20 without the need to set a complex turbulence structure on the surface of the fin 10 to form turbulence.

[0041] The flange structure 102 includes a side support flange 107 disposed on the side of the first connecting through hole 105 at both ends and a tail guide flange 108 disposed outside the second connecting through hole 106. A first air outlet 109 is provided between the side support flange 107 and the adjacent tail guide flange 108 for the flow of heat-transfer fluid. For example, in the width direction of the fin 10, the side support flange 107 extends from the front end of the windward side 103 to the middle of the fin 10. The side support flange 107 is set at both ends of the windward side 103. In this way, when the high-temperature flue gas enters the fin 10, the side support flange 107 plays the role of concentrating the high-temperature flue gas, improving the efficiency of the high-temperature flue gas, and preventing the high-temperature flue gas from escaping from other directions. The tail guide flange 108 can limit the high-temperature flue gas from flowing out of the fin 10 too quickly. Sufficient heat exchange time can improve the heat exchange efficiency. The first air outlet 109 can guide the low-temperature flue gas after heat exchange to the outside of the fin 10, and also prevent the low-temperature flue gas after heat exchange from staying in the fin 10, which would affect the heat exchange efficiency.

[0042] Please refer to Figures 1-7 In this embodiment, the tail guide flange 108 is provided on the edge of the leeward side 104 and has at least one second air outlet 110 and at least one third air outlet 111. The second air outlet 110 is opposite to the center of the second connecting through hole 106, and the third air outlet 111 is opposite to the center of the first connecting through hole 105. Understandably, the tail guide flange 108 is located on the edge of the leeward side 104 and is arranged to surround the second connecting through hole 106. At the position opposite to the center of the second connecting through hole 106, the tail guide flange 108 forms a notch, namely the second air outlet 110; at the position opposite to the center of the first connecting through hole 105, the tail guide flange 108 forms a second notch, namely the third air outlet 111. The second air outlet 110 and the third air outlet 111 are both used to discharge the low-temperature flue gas after heat exchange. As shown in the figure, when the high-temperature flue gas enters the fin 10, it will hit the heat transfer tube 20 where the first connecting hole and the second connecting hole are located and flow backward along the channel between the heat transfer tubes 20 and the edge of the heat transfer tube 20. The first air outlet 109, the second air outlet 110 and the third air outlet 111 can all discharge the low-temperature flue gas after heat exchange, so as to avoid the low-temperature flue gas from being disturbed in the fin 10 and forming mixed flow with the high-temperature flue gas entering, thereby affecting the heat exchange efficiency.

[0043] Please refer to Figures 1-7In this embodiment, the distance between adjacent first connecting through holes 105 and second connecting through holes 106 is L1, the opening width of the second air outlet 110 in the length direction of the fin 10 is L2, and the opening width of the third air outlet 111 in the length direction of the fin 10 is L3. L1, L2 and L3 satisfy the following relationship: L2 = (0.35-0.45)L1; L3 = (0.3-0.4)L1. As can be understood, as shown in the figure, the distance between adjacent first connecting through holes 105 and second connecting through holes 106 refers to the distance between the centers of the circles connecting the first connecting through holes 105 and second connecting through holes 106 on the same cross section, which intersects the first connecting through holes 105 and second connecting through holes 106 respectively. The distance between the two intersection points is L1. The opening width of the second air outlet 110 in the length direction of the fin 10 refers to the length of the projection of the second air outlet 110 in the length direction of the fin 10, which is the width L2 of the second air outlet 110. Similarly, the width L3 of the third air outlet 111 is also the length of the projection of the third air outlet 111 in the length direction of the fin 10. Specifically, L2 / L1 can be 0.35, 0.37, 0.39, 0.4, 0.42, 0.45, etc., and L3 / L1 can be 0.3, 0.32, 0.34, 0.36, 0.38, 0.4, etc. The width of the second air outlet 110 and the third air outlet 111 affects the speed at which the low-temperature flue gas flows out. The wider the opening, the faster the flue gas flows out. When the flow rate is too fast, the high-temperature flue gas will flow out before it has fully exchanged heat, which will cause this part of the heat to be lost, resulting in low heat exchange efficiency and excessive energy consumption. The narrower the opening, the slower the flue gas flows out. This will cause the low-temperature flue gas after heat exchange to mix with the high-temperature flue gas again before it flows out, which will also lead to low heat exchange efficiency. Therefore, by limiting the width of the second air outlet 110 and the third air outlet 111, the heat exchange efficiency can be guaranteed.

[0044] Please refer to Figures 1-7In this embodiment, in the width direction of the fin 10, the first air outlet 109 is located between the center of the adjacent first connecting through hole 105 and the center of the adjacent second connecting through hole 106; in the length direction of the fin 10, the first air outlet 109 is located outside the center of the adjacent first connecting through hole 105; it can be understood, as shown in the figure, that is, the first air outlet 109 at the left end is located to the upper left of the adjacent first connecting through hole 105, and the first air outlet 109 at the right end is located to the upper right of the adjacent first connecting through hole 105. In this way, the high-temperature flue gas entering from the gap between the adjacent first connecting through holes 105 can fully exchange heat with the heat transfer tube 20 where the second connecting through hole 106 is located, and will not flow out quickly from the first air outlet 109; however, the position of the first air outlet 109 is not suitable to be set too far away from the second connecting through hole 106, because if it is too far away from the second connecting through hole 106, the low-temperature flue gas will form a mixed flow at the end of the first connecting through hole 105, affecting the discharge of the low-temperature flue gas.

[0045] The opening width of the first air outlet 109 along the length of the fin 10 is L4, and the distance between adjacent first connecting through holes 105 and second connecting through holes 106 is L1. L1 and L4 satisfy the following relationship: L4 = (0.3-0.4)L1. Specifically, L2 / L1 can be 0.3, 0.32, 0.34, 0.36, 0.38, 0.4, etc. Similarly, the width of the first air outlet 109 also affects the outflow velocity of the low-temperature flue gas. Similar to the second air outlet 110 and the third air outlet 111, it should not be too large or too small.

[0046] Please refer to Figures 1-7 In this embodiment, the total number of through holes 105 and 106 is 5, 7, or 9, with the number of first connecting through holes 105 exceeding the number of second connecting through holes 106. It is understood that the first connecting through holes 105 and 106 are arranged in a side-by-side, staggered manner. When the total number is 5, there are 3 first connecting through holes 105 and 2 second connecting through holes 106; when the total number is 7, there are 4 first connecting through holes 105 and 3 second connecting through holes 106; and when the total number is 9, there are 5 first connecting through holes 105 and 4 second connecting through holes 106. To reduce the use of flux when welding the heat transfer tube 20 and to ensure the assembly accuracy and total heat exchange area of ​​the heat transfer tube 20, this embodiment preferably uses 7 through holes.

[0047] Please refer to Figures 1-3In this embodiment, the fin body 101 has a first partition 112 between two adjacent first connecting through holes 105, and a second partition 113 between two adjacent second connecting through holes 106. The first partition 112 extends toward the second connecting through hole 106, and the second partition 113 extends toward the first connecting through hole 105. It can be understood that by providing the first partition 112 and the second partition 113, the fin body 101 has an overall wavy structure. The first partition 112 and the second partition 113 are used to ensure the placeability, uniform application, and ease of welding of the solder paste when welding the fin 10 and the heat transfer tube 20. In other embodiments, the distance between the second connecting through hole 106 and the second partition 113 is less than the flow distance of the solder paste, which is beneficial for the molten solder paste to be evenly distributed between the heat transfer tube 20 and the second connecting through hole 106, achieving one-time reflow soldering.

[0048] Please refer to Figures 1-3 In this embodiment, the flange structure 102 further includes a flange 114 of the heat transfer tube 20 surrounding the edges of the first connecting through hole 105 and the second connecting through hole 106. It is understood that the flange 114 of the heat transfer tube 20 is used to connect with the heat transfer tube 20 during welding of the fin body 101 and the heat transfer tube 20. The flange structure 102 enables the flux to maintain good contact with the surface of the heat transfer tube 20, reducing contact thermal resistance and thus improving heat exchange efficiency. The height of the flange 114 of the heat transfer tube 20 is H2, and the thickness of the fin 10 is H1. H1 and H2 satisfy the following relationship:

[0049] H2:H1 = (1.0-1.2):0.3.

[0050] Specifically, the ratio of the height H2 of the flange 114 of the heat transfer tube 20 to the thickness of the fin 10 can be 1.0:0.3, 1.1:0.3, or 1.2:0.3, etc. The flange 114 of the heat transfer tube 20 is used to connect the fin 10 and the heat transfer tube 20. If the flange 114 of the heat transfer tube 20 is too low, it will affect the welding effect. If the flange 114 of the heat transfer tube 20 is too high, it will increase the manufacturing difficulty. Therefore, limiting the ratio of the height of the flange 114 of the heat transfer tube 20 to the thickness of the fin 10 can achieve both welding effect and reduce the difficulty of manufacturing process.

[0051] In this embodiment, the height of the side support flange 107 is H3, the height of the tail guide flange 108 is H4, and the thickness of the fin 10 is H1. H1, H3, and H4 satisfy the following relationship:

[0052] H3:H1=(1.0-1.2):0.3;

[0053] H4:H1 = (1.0-1.2):0.3.

[0054] Specifically, the ratio of the height H3 of the side support flange 107 to the thickness of the fin 10 can be 1.0:0.3, 1.1:0.3, or 1.2:0.3, etc., and the ratio of the height H4 of the tail guide flange 108 to the thickness of the fin 10 can be 1.0:0.3, 1.1:0.3, or 1.2:0.3, etc. The heights of the side support flange 107 and the tail guide flange 108 affect the flow velocity of the flue gas. If these heights are too low, the flue gas will flow out of the fin 10 too quickly, reducing heat exchange efficiency. If these heights are too high, the flue gas will not be able to be discharged smoothly, which will also affect heat exchange efficiency. By limiting the relationship between these two heights and the thickness of the fin 10, it can be ensured that low-temperature flue gas can be discharged normally without allowing high-temperature flue gas to flow out too quickly.

[0055] Please refer to Figures 1-2 , Figures 4-7 Another embodiment of this utility model also provides a heat exchanger, which includes a heat transfer tube 20 and at least two stacked fins 10 as described above. The heat transfer tube 20 is disposed in the first connecting through hole 105 and the second connecting through hole 106 and is fixedly connected to the fin body 101. The outer diameter of the heat transfer tube 20 corresponds to the inner diameter of the first connecting through hole 105 and the second connecting through hole 106. It can be understood that the heat transfer tube 20 and the first connecting through hole 105 and the second connecting through hole 106 are concentric circular structures with corresponding shapes. The heat transfer tube 20 passes through the first connecting through hole 105 and the second connecting through hole 106 respectively and is connected and fixed to the fin body 101, generally by welding.

[0056] In the thickness direction of the heat exchanger, the distance between two adjacent fins 10 is greater than the height of the tail guide flange 108, so that a fourth air outlet 115 is formed between two adjacent fins 10. It is understandable that gaps will be formed between the stacked fins 10. When high-temperature flue gas enters the heat exchanger from the windward side 103, the high-temperature flue gas enters the gap between each adjacent fin 10 and flows out from the leeward side 104. The tail guide flange 108 is used to discharge low-temperature flue gas. The gap formed between the tail guide flange 108 and the adjacent fins 10 is the fourth air outlet 115. The fourth air outlet 115 can ensure that the low-temperature flue gas flows out smoothly and will not stagnate in the space between adjacent fins 10 and form mixed flow, thereby ensuring heat exchange efficiency.

[0057] In this embodiment, the height of the tail guide flange 108 is H4, and the distance between two adjacent fins 10 is H5. H4 and H5 satisfy the following relationship: H4:H5 = 0.8-0.9; specifically, H4:H5 can be 0.8, 0.82, 0.84, 0.86, 0.88, 0.9, etc.

[0058] Furthermore, the outer diameter of the heat transfer tube 20 is 15-16 mm, and the center-to-center distance between two adjacent heat transfer tubes 20 in the same row is 28-30 mm; in the width direction of the fins 10, the center-to-center width between two adjacent heat transfer tubes 20 in different rows is 17-19 mm. Understandably, to prevent the hot water inside the heat transfer tube 20 from vaporizing, components such as spiral turbulence vanes and turbulence springs are generally added inside the heat transfer tube 20. In this embodiment, the outer diameter of the heat transfer tube 20 is 2-3 mm larger than that of the heat transfer tube 20 in a traditional heat exchanger. This allows for maintaining the flow rate of water inside the pipe and reducing the resistance inside the heat transfer tube 20 even after the installation of spiral turbulence vanes and turbulence springs. The center-to-center width between two adjacent heat transfer tubes 20 in different rows refers to the width of the projection of the centers of the heat transfer tubes 20 in the direction of the fins 10.

[0059] In this specification, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0060] In the description of this specification, the references to terms such as "preferred embodiment," "another embodiment," "other embodiment," or "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A type of easily machinable circular tube heat exchanger fin, characterized in that, The fin includes a fin body and a flange structure disposed on the fin body and extending upward; The fin body includes a windward side and a leeward side. The windward side is the side facing the fluid during heat transfer, and the leeward side is arranged opposite to the windward side. The windward side has a plurality of first connecting through holes, which are spaced apart along the length of the fin body. The leeward side has a plurality of second connecting through holes, which are spaced apart along the length of the fin body, and the center of the second connecting through hole is located between the centers of two adjacent first connecting through holes in the length direction. The flange structure includes a side support flange disposed on the side of the first connecting through hole at both ends and a tail guide flange disposed on the outside of the second connecting through hole. A first air outlet is provided between the side support flange and the adjacent tail guide flange for the flow of heat-transferring fluid.

2. The easily machinable circular tube heat exchanger fins as described in claim 1, characterized in that, The tail guide flange is located on the edge of the leeward side and has at least one second air outlet and at least one third air outlet. The second air outlet is opposite to the center of the second connecting through hole, and the third air outlet is opposite to the center of the first connecting through hole.

3. The easily machinable circular tube heat exchanger fins as described in claim 2, characterized in that, The distance between adjacent first and second connecting through holes is L1, the opening width of the second air outlet in the fin length direction is L2, and the opening width of the third air outlet in the fin length direction is L3. L1, L2 and L3 satisfy the following relationship: L2 = (0.35-0.45)L1; L3 = (0.3-0.4)L1.

4. The easily machinable circular tube heat exchanger fins as described in claim 1, characterized in that, In the width direction of the fin, the first air outlet is located between the center of the adjacent first connecting through hole and the center of the adjacent second connecting through hole; in the length direction of the fin, the first air outlet is located outside the center of the adjacent first connecting through hole. The opening width of the first air outlet in the length direction of the fin is L4, and the distance between adjacent first connecting through holes and second connecting through holes is L1. L1 and L4 satisfy the following relationship: L4 = (0.3-0.4)L1.

5. The easily machinable circular tube heat exchanger fins as described in claim 1, characterized in that, The total number of the first connecting through hole and the second connecting through hole is 5, 7 or 9, wherein the number of the first connecting through hole is greater than the number of the second connecting through hole.

6. The easily machinable circular tube heat exchanger fins as described in claim 1, characterized in that, The fin body has a first partition between two adjacent first connecting through holes, and the fin body has a second partition between two adjacent second connecting through holes. The first partition extends toward the second connecting through hole, and the second partition extends toward the first connecting through hole.

7. The easily machinable circular tube heat exchanger fins as described in claim 1, characterized in that, The flange structure further includes a heat transfer tube flange surrounding the edges of the first connecting through hole and the second connecting through hole, the height of the heat transfer tube flange being H2, and the thickness of the fin being H1. H1 and H2 satisfy the following relationship: H2:H1 = (1.0-1.2):0.

3.

8. The easily machinable circular tube heat exchanger fins as described in claim 1, characterized in that, The height of the side support flange is H3, the height of the tail guide flange is H4, and the thickness of the fin is H1. H1, H3, and H4 satisfy the following relationship: H3:H1=(1.0-1.2):0.3; H4:H1 = (1.0-1.2):0.

3.

9. A heat exchanger, characterized in that, The device includes a heat transfer tube and at least two stacked fins as described in any one of claims 1-8, wherein the heat transfer tube is disposed in the first connecting through hole and the second connecting through hole and is fixedly connected to the fin body, and the outer diameter of the heat transfer tube corresponds to the inner diameter of the first connecting through hole and the second connecting through hole; In the thickness direction of the heat exchanger, the spacing between two adjacent fins is greater than the height of the tail guide flange, so that a fourth air outlet is formed between two adjacent fins.

10. The heat exchanger as claimed in claim 9, characterized in that, The height of the tail guide flange is H4, and the distance between two adjacent fins is H5. H4 and H5 satisfy the following relationship: H4:H5 = 0.8-0.9; The outer diameter of the heat transfer tube is 15-16mm, and the center distance between two adjacent heat transfer tubes in the same row is 28-30mm; in the width direction of the fins, the center width of two adjacent heat transfer tubes in different rows is 17-19mm.

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