Heat exchange sheet and heat exchanger
By setting heat exchange bulges and turbulence structures on the heat exchange plates and optimizing the airflow channels, the thermal stress problem caused by the large temperature gradient in the back flow area of the heat exchange plates is solved, thereby improving the heat exchange uniformity and service life.
Patent Information
- Application Number
- CN202423043969.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-10
AI Technical Summary
The large temperature gradient between the backflow and frontflow regions of the heat exchange fins near the exhaust end leads to thermal stress concentration and affects service life.
Heat exchange protrusions are set in the backflow side region of the heat exchange tube holes near the exhaust end of the heat exchange fins to increase the contact area of flue gas flow, and the airflow channel is optimized by the turbulence structure to reduce temperature difference and thermal stress.
It improves the heat exchange uniformity of the heat exchange fins, reduces the possibility of thermal cracking, extends service life, and improves the service life of the heat exchanger.
Smart Images
Figure CN223636709U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to hot water equipment technical field especially relates to a heat exchange sheet and heat exchanger. BACKGROUND
[0002] The gas hot water equipment generates high temperature flue gas through the burner work, and the heat energy of high temperature flue gas is transmitted to the water side through the heat exchanger, so that the temperature of water rises. Among them, the heat exchange of heat exchanger and high temperature flue gas is mainly realized through the heat exchange sheet on it, and the heat exchange efficiency of heat exchange sheet plays an important role in heat exchanger.
[0003] In order to meet the heat exchange demand, the heat exchange sheet is usually provided with two rows or multiple rows of heat exchange pipe holes, and through simulation analysis, it is known that the backflow side area of the heat exchange pipe hole close to the exhaust end direction of the heat exchange sheet has low heat exchange efficiency, forming a low temperature zone, which leads to the temperature difference gradient of the flow side area and the backflow side area of the heat exchange pipe hole of the exhaust end, and the heat stress is easy to produce, and the repeated heat stress in the repeated heating process of the heat exchange sheet may lead to thermal cracks in the heat exchange sheet, affecting the service life of the heat exchange sheet and the heat exchanger using the heat exchange sheet. UTILITY MODEL CONTENTS
[0004] One of the technical problems solved by the utility model is to provide a heat exchange sheet, which can solve the problem of large temperature difference gradient of the backflow side area and the flow side area of the heat exchange pipe hole close to the exhaust end of the heat exchange sheet, and short service life of the heat exchange sheet;
[0005] The second technical problem solved by the utility model is to provide a heat exchanger, which can solve the problem of short service life.
[0006] One of the above technical problems is solved by the following technical scheme:
[0007] The heat exchange sheet comprises a substrate, the substrate has an air inlet end and an air outlet end along the air flow direction, at least two heat exchange pipe hole groups are arranged on the substrate along the air flow direction, each heat exchange pipe hole group comprises a plurality of heat exchange pipe holes arranged along the length direction of the substrate, one of the heat exchange pipe hole groups closest to the air outlet end of the substrate is a first heat exchange pipe hole group, the heat exchange pipe hole in the first heat exchange pipe group is a first heat exchange pipe hole, the length direction of the substrate intersects the air flow direction, and the backflow side area of the first heat exchange pipe hole is provided with a heat exchange convex on the substrate.
[0008] The heat exchange sheet has the beneficial effects compared with the background art:
[0009] By arranging the heat exchange convex bump on the back flow side area of the first heat exchange pipe hole, the area of the back flow side area of the first heat exchange pipe hole in contact with the flue gas flow is increased, the heat exchange balance of the back flow side area and the flow side area of the first heat exchange pipe hole is improved, the possibility of thermal cracks caused by thermal stress of the heat exchange fin is reduced, and the service life of the heat exchange fin is prolonged.
[0010] In one embodiment, the heat exchange convex bump comprises a main body part arranged in a circular arc shape coaxial with the first heat exchange pipe hole.
[0011] In one embodiment, the first heat exchange pipe hole is also symmetrically provided with a flow disturbance structure on the two sides arranged opposite to each other along the length direction of the base plate.
[0012] In one embodiment, the minimum distance between the heat exchange convex bump and the flow disturbance structure is 2-3mm.
[0013] In one embodiment, the heat exchange convex bump further comprises an extension part, two extension parts are arranged on the opposite sides of the main body part along the length direction of the base plate, and the extension part is arranged in a circular arc shape with the center pointing to the exhaust end.
[0014] In one embodiment, the heat exchange pipe hole group is provided with two groups, the heat exchange pipe hole group adjacent to the first heat exchange pipe hole group is a second heat exchange pipe hole group, the heat exchange pipe hole in the second heat exchange pipe hole group is a second heat exchange pipe hole, the second heat exchange pipe hole is arranged opposite to the first heat exchange pipe hole along the length direction of the base plate, and the first notch recessed in the airflow direction is arranged between the adjacent two second heat exchange pipe holes at the air inlet end of the base plate, and the first notch is opposite to the first heat exchange pipe hole.
[0015] In one embodiment, the center line of the adjacent second heat exchange pipe hole and the first heat exchange pipe hole is a first preset center line, and the first notch crosses the first preset center line.
[0016] In one embodiment, the maximum width of the first notch along the length direction of the base plate is not greater than the distance between the two ends of the heat exchange convex bump along the length direction of the base plate.
[0017] In one embodiment, the heat exchange fin is further provided with a heat exchange boss, and a plurality of heat exchange bosses are arranged in the flow side area of the second heat exchange pipe hole.
[0018] The second technical problem is solved by the following technical scheme:
[0019] A heat exchanger comprises a heat exchange pipe and the heat exchange fin in any of the above embodiments, the heat exchange fins are arranged in layers, and a plurality of heat exchange pipes are arranged in the heat exchange pipe holes.
[0020] Compared with the background art, the heat exchanger has the beneficial effects that:
[0021] The heat exchanger provided by the utility model can improve the heat exchange balance of the heat exchanger and prolong the service life of the heat exchanger. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 It is a front view of the heat exchange sheet provided in the embodiment of the utility model;
[0023] Figure 2 It is a three-dimensional structure schematic view of the heat exchange sheet provided in the embodiment of the utility model;
[0024] Figure 3 It is a structure schematic view of the heat exchange convex provided in the embodiment of the utility model;
[0025] Figure 4 It is a structure schematic view of the heat exchange convex provided in the embodiment of the utility model.
[0026] Label explanation:
[0027] 1, base plate;11, air inlet end;12, air outlet end;13, first gap;14, second gap;2, heat exchange pipe hole;2a, first heat exchange pipe hole;2b, second heat exchange pipe hole;3, heat exchange convex;31, main body part;32, extension part;4, flanging hole;5, heat exchange convex;6, guide type flanging;61, first flanging;62, second flanging;101, first preset center line;102, second preset center line. DETAILED DESCRIPTION
[0028] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.
[0029] In the description of the application, it should be understood that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.
[0030] The terms "first", "second", "third", etc. are used only for descriptive purposes and do not connote or imply relative importance or a number of the indicated technical features. Thus, features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.
[0031] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0032] Reference Figures 1-4 As shown in the embodiments of the present application, a heat exchange sheet can be used to manufacture a heat exchanger, which can be applied to gas water heating equipment such as gas water heaters and gas wall-mounted furnaces, to realize heat exchange between high-temperature flue gas flow and water flow in the heat exchanger. However, it should be understood that the heat exchanger can also be applied to other scenarios where heat exchange between heat exchange gas flow and internal medium of the heat exchanger is required. The following embodiments take the heat exchange sheet applied to gas water heating equipment and the heat exchange gas flow as high-temperature flue gas flow as an example to introduce the structure of the heat exchange sheet.
[0033] The heat exchange sheet includes a substrate 1, which has an air inlet end 11 and an air outlet end 12 along the air flow direction. At least two heat exchange pipe hole groups are arranged on the substrate 1 along the air flow direction, and each heat exchange pipe hole group includes a plurality of heat exchange pipe holes 2 arranged along the length direction of the substrate 1. The length direction of the substrate 1 intersects the air flow direction, and the backflow side area of the heat exchange pipe hole 2 in the heat exchange pipe hole group closest to the air outlet end 12 of the substrate 1 is provided with a heat exchange convex 3. The heat exchange pipe hole group closest to the air outlet end 12 is defined as the first heat exchange pipe hole group, and the heat exchange pipe hole 2 in the first heat exchange pipe hole group is the first heat exchange pipe hole 2a. The heat exchange convex 3 is continuously arranged symmetrically about the diameter of the first heat exchange pipe hole 2a along the air flow direction.
[0034] The heat exchange fin is provided with a heat exchange protrusion 3 at the back flow side area of the row of heat exchange pipe holes 2 closest to the exhaust end 12 of the base plate 1. Since the heat exchange protrusion 3 is continuously arranged in axial symmetry with the diameter of the first heat exchange pipe hole 2a as the axis in the direction of the gas flow, the contact area of the back flow side area of the row of heat exchange pipe holes 2 closest to the exhaust end 12, especially the area directly behind the first heat exchange pipe hole 2a (low temperature area), with the flue gas flow can be increased, the heat exchange efficiency is improved, the temperature difference between the back flow side area and the flow side area of the first heat exchange pipe hole 2a is reduced, the thermal stress is further reduced, and the possibility of thermal cracks in the heat exchange fin is reduced. Moreover, the heat exchange protrusion 3 can also serve as a reinforcing rib to further increase the mechanical strength of the back flow side area of the row of heat exchange pipe holes 2 closest to the exhaust end 12, thereby prolonging the service life of the heat exchange fin.
[0035] In an embodiment, the direction of the gas flow is the X direction as shown in Figure 1 , the upstream of the X direction is the air inlet end 11, the downstream of the X direction is the exhaust end 12, and the length direction of the base plate 1 is the Y direction as shown in Figure 1 , the Y direction is perpendicular to the X direction, that is, the length direction of the base plate 1 is perpendicular to the direction of the gas flow.
[0036] Specifically, the heat exchange protrusion 3 includes a main body part 31, and the main body part 31 is in the shape of a circular arc coaxial with the first heat exchange pipe hole 2a. That is, the distance from the main body part 31 to the first heat exchange pipe hole 2a is the same everywhere, thereby improving the uniformity of the heat exchange efficiency between the heat exchange fin and the heat exchange pipes inserted in the first heat exchange pipe hole 2a, and further avoiding thermal stress concentration. More specifically, the heat exchange protrusion 3 is a protrusion integrally formed when the base plate 1 is processed, the edge of the heat exchange protrusion 3 and the connecting part of the base plate 1 are smoothly transitioned, the resistance to the flue gas flow is small, and the heat exchange efficiency is high.
[0037] For example, the distance between the main body part 31 and the first heat exchange pipe hole 2a is between 3-5mm, for example, the radius of the first heat exchange pipe hole 2a is 7.5mm, and the radius of the inner circumferential wall of the main body part 31 is 10.5-12.5mm.
[0038] Continuing to refer to Figures 1-3 , in order to make the flue gas flow fully contact with the heat exchange pipes in the first heat exchange pipe hole 2a to further improve the heat exchange efficiency, the two sides of the first heat exchange pipe hole 2a arranged opposite to each other along the length direction of the base plate 1 are also symmetrically provided with a flow disturbing structure, the flow disturbing structure cooperates with the first heat exchange pipe hole 2a to form a gas flow channel, and the flue gas flow flows along the gas flow channel to the exhaust end 12 of the base plate 1 under the action of the flow disturbing structure.
[0039] For example, the flow disturbing structure includes a plurality of flange holes 4 arranged at intervals in the direction of the gas flow, which can guide the direction of the flue gas flow while avoiding the formation of a high temperature area, and can also reduce the weight of the heat exchange fin, thereby saving costs.
[0040] Exemplarily, the spoiler structure comprises two identical flanged holes 4, and the center of any flanged hole 4 is at the same distance from the center of the corresponding first heat exchange pipe hole 2a.
[0041] In other embodiments, the spoiler structure can also be a convex bump integrally formed on the substrate 1.
[0042] It is emphasized that, in order to further improve the heat exchange efficiency of the backflow side area of the first heat exchange pipe hole 2a, the two ends of the heat exchange convex bump 3 along the length direction of the substrate 1 should be as close to the spoiler structure as possible. For example, when the spoiler structure is a plurality of spaced flanged holes 4, the two ends of the heat exchange convex bump 3 along the length direction of the substrate 1 should be as close as possible to the two flanged holes 4 that are the most downstream in the airflow direction and closest to the exhaust end, so as to reduce the possibility of flue gas flowing directly from the gap between the heat exchange convex bump 3 and the flanged hole 4 to the exhaust end 12 without passing through the heat exchange convex bump 3. Of course, the flanging direction of the flanged hole 4 is consistent with the convex direction of the heat exchange convex bump 3. Based on the flanging process of the flanged hole 4, the distance between the heat exchange convex bump 3 and the flanged hole 4 closest to the exhaust end is in the range of 2-3 mm. Of course, if the spoiler structure is a convex bump, the minimum distance between the extension 32 and the convex bump is also in the range of 2-3 mm.
[0043] In an embodiment, the exhaust end 12 of the substrate 1 is also provided with a second notch 14 recessed towards the air inlet end 11 of the substrate 1, to further reduce the weight of the heat exchange fin and save materials. Specifically, the second notch 14 is arranged between the two first heat exchange pipe holes 2a adjacent to each other and the two first heat exchange pipe holes 2a closest to the side edges of the substrate 1 along the length direction of the substrate 1 and the two side edges of the substrate 1 arranged opposite to each other along the length direction.
[0044] On this basis, in order to reduce the processing difficulty of the heat exchange convex bump 3, the heat exchange convex bump 3 further comprises an extension 32, and the two extensions 32 are respectively located on both sides of the main body part 31 along the length direction of the substrate 1 and are arranged in the form of a circular arc with the center pointing to the exhaust end 12, so as to avoid the spoiler structure while extending the effective length of the heat exchange convex bump 3, further increasing the heat exchange area, thereby enhancing the heat exchange effect. Of course, when the second notch 14 is not arranged, the heat exchange convex bump 3 can also comprise an extension 32 in the form of a circular arc with the center pointing to the exhaust end 12.
[0045] The heat exchange pipe hole group adjacent to the first heat exchange pipe hole group is set as a second heat exchange pipe hole group, the heat exchange pipe holes 2 in the second heat exchange pipe hole group are second heat exchange pipe holes 2b, and the second heat exchange pipe holes 2b are arranged staggered with the first heat exchange pipe holes 2a in the length direction of the substrate 1, so as to increase the diameter of the single heat exchange pipe hole 2, increase the number of heat exchange pipes that can be inserted on the heat exchange fin, and improve the heat exchange efficiency under the condition that the size of the substrate is the same and unchanged.
[0046] In an embodiment, the heat exchange tube hole groups only include the first heat exchange tube hole group and the second heat exchange tube hole group, and the first heat exchange tube hole group and the second heat exchange tube hole group are arranged alternately along the length direction of the base plate 1. Figure 1 and Figure 2 As shown in FIG. 1, the first notch 13 is arranged between the two adjacent second heat exchange tube holes 2b and the first heat exchange tube hole 2a, and the first notch 13 is concave in the direction of the gas flow. The first notch 13 is arranged opposite to the first heat exchange tube hole 2a, which can avoid the heat accumulation between the two adjacent second heat exchange tube holes 2b to form a high temperature area. Moreover, the greater the volume of the first notch 13 is, the smaller the resistance of the flue gas flow is, and the lighter the weight of the heat exchange fin is, and the lower the cost is.
[0047] In an embodiment, the center line of the two adjacent second heat exchange tube holes 2b and the first heat exchange tube hole 2a is set as the first preset center line 101, and the opposite sides of the first notch 13 along the length direction of the base plate 1 respectively cross the first preset center line 101, which can further reduce the weight of the heat exchange fin, reduce the manufacturing cost, and reduce the pressure loss by 20% at the same time, thereby greatly improving the wind pressure resistance of the heat exchange fin.
[0048] In addition, the maximum width of the first notch 13 along the length direction of the base plate 1 is not greater than the distance between the two ends of the heat exchange convex 3 along the length direction of the base plate 1, which can make the flue gas flow through the first notch 13 to the first heat exchange tube hole 2a as much as possible to contact the heat exchange convex 3, thereby further improving the heat exchange efficiency, and the heat exchange convex 3 can compensate for the decrease in heat efficiency caused by the arrangement of the first notch 13.
[0049] Specifically, the side edge of the first notch 13 includes a first edge line arranged around the second heat exchange tube hole 2b, a second edge line arranged around the first heat exchange tube hole 2a, a third edge line crossing the first preset center line 101, a fourth edge line connecting the first edge line and the third edge line, and a fifth edge line connecting the second edge line and the third edge line. The first edge line is a circular arc line coaxial with the second heat exchange tube hole 2b, and the first edge line crosses the second preset center line 102 passing through the centers of the plurality of second heat exchange tube holes 2b. The second edge line is a circular arc line coaxial with the first heat exchange tube hole 2a. The third edge line is a circular arc line with the same radius as the inner diameter of the flange hole 4, and the center of the third edge line is at a distance from the center of the adjacent first heat exchange tube hole 2a equal to the distance from the center of the flange hole 4 to the center of the corresponding first heat exchange tube hole 2a. The fourth edge line is tangent to the first edge line and the third edge line. The fifth edge line is tangent to the second edge line and the third edge line.
[0050] For example, the distance between the two adjacent second heat exchange tube holes 2b is A, the distance between the first edge line and the second heat exchange tube hole 2b is A, 5mm≤A≤7mm, the distance between the second edge line and the first heat exchange tube hole 2a is B, 5mm≤B≤7mm, and the diameter of the flange hole 4 is 4mm.
[0051] refer to Figure 1 and Figure 2 As shown, the heat exchange plate is also provided with heat exchange bosses 5. Multiple heat exchange bosses 5 are arranged around the second heat exchange tube hole 2b at intervals in the flow-facing area of the second heat exchange tube hole 2b, in order to increase the heat exchange area between the flue gas flow and the outer periphery of the second heat exchange tube hole 2b and improve the heat exchange efficiency.
[0052] Compared to the continuously arranged heat exchange protrusions 3, the heat exchange protrusions 5 arranged at intervals on the flow-facing side of the second heat exchange tube hole 2b can further improve thermal efficiency while minimizing the possibility of thermal fatigue stress and extending the service life of the heat exchange plate.
[0053] For example, six heat exchange protrusions 5 are provided on the outer edge of any second heat exchange tube hole 2b, and the six heat exchange protrusions 5 are symmetrically arranged with respect to the second heat exchange tube hole 2b along the length direction of the substrate 1. That is, three heat exchange protrusions 5 are provided on each opposite side of the second heat exchange tube hole 2b along the length direction of the substrate 1. The diameter of any heat exchange protrusion 5 is 2mm, and the angle between the line connecting two adjacent heat exchange protrusions 5 and the center of the corresponding second heat exchange tube hole 2b is 15°.
[0054] In one embodiment, the number of first heat exchange tube holes 2a is less than the number of second heat exchange tube holes 2b. For example, Figure 2 In the illustrated embodiment, three second heat exchange tube holes 2b are provided, two first heat exchange tube holes 2a are provided, and two corresponding first notches 13 are provided. In another embodiment, four second heat exchange tube holes 2b can be provided, three first heat exchange tube holes 2a are provided, and three corresponding first notches 13 are provided. Having fewer second heat exchange tube holes 2b than first heat exchange tube holes 2a allows the flue gas to flow towards the center of the substrate 1 when flowing towards the exhaust end 12, preventing the flue gas from concentrating too much at both ends of the substrate 1's length. This reduces the temperature of the water heater casing when the heat exchange plate is used in a water heater, preventing scalding.
[0055] In one embodiment, the second heat exchange tube hole 2b and the first heat exchange tube hole 2a are also flanged holes, and the protrusion direction is the same as the protrusion direction of the turbulence structure and the heat exchange bump 3, so that the flue gas flow can flow around the heat exchange tube better. Moreover, setting it as a flanged hole can also increase the contact area between the heat exchange tube and the heat exchange plate, which is beneficial to the welding and fixing between the heat exchange tube and the substrate 1.
[0056] In order to enable the flue gas flow to be condensed in the area where the substrate 1 is located, in an embodiment, the substrate 1 is provided with a guide-type folded edge 6 at both ends in the length direction of the substrate 1, the guide-type folded edge 6 can be integrally formed with the substrate 1 by bending the two ends in the length direction of the substrate 1, and in the direction of the airflow, the distance between the two guide-type folded edges 6 located at the end of the air inlet end 11 of the substrate 1 is greater than the distance between the two guide-type folded edges 6 located at the end of the air outlet end 12 of the substrate 1, so as to guide the flue gas flow to flow to the middle area of the heat exchange fin, increase the area of the flue gas flow in contact with the heat exchange pipe inserted into the second heat exchange pipe hole 2b and the first heat exchange pipe hole 2a, and improve the heat exchange effect.
[0057] Optionally, the guide-type folded edge 6 comprises a first folded edge 61 and a second folded edge 62, wherein the first folded edge 61 extends in the flow direction of the flue gas flow, the second folded edge 62 is located downstream of the first folded edge 61, and the two second folded edges 62 oppositely arranged along the length direction of the substrate 1 gradually approach each other from one end connected to the first folded edge 61 to the air outlet end 12, so as to guide the flue gas flow to smoothly flow out from the air outlet end 12.
[0058] In order to reduce the processing difficulty of the first folded edge 61 and the second folded edge 62, the first folded edge 61 and the second folded edge 62 are arranged at intervals.
[0059] In the embodiment of the utility model, a heat exchanger is also provided, which comprises heat exchange pipes and the heat exchange fin in any of the above embodiments, the heat exchange fins are arranged in layers, and the plurality of heat exchange pipes are arranged in the second heat exchange pipe hole 2b and the first heat exchange pipe hole 2a.
[0060] The heat exchanger described above adopts the heat exchange fin described above, which can meet the heat efficiency requirement, reduce the thermal fatigue loss, and improve the wind pressure resistance.
[0061] In the embodiment of the utility model, a gas hot water equipment is also provided, which comprises a burner and the heat exchanger described above, and the burner is arranged at the air inlet end 11 of the heat exchanger (the air inlet end 11 of the heat exchange fin). Since the heat exchanger described above is included, the gas hot water equipment has all the beneficial effects of the heat exchanger.
[0062] It can be understood that when the heat exchange fin is applied to the gas hot water equipment, the X direction is vertically arranged, and the air outlet end 12 is located above the air inlet end 11, that is, the burner is arranged below the heat exchange fin.
[0063] In the specific content of the above specific embodiments, any combination of technical features can be combined without contradiction, in order to make the description simple, not all possible combinations of the above technical features are described, however, as long as the combination of these technical features does not exist contradiction, it should be considered as the scope of the description.
[0064] The specific contents of the foregoing specific embodiments are only to express several embodiments of the utility model, and the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent scope. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.
Claims
1. Heat exchange fin, characterized in that The heat exchange sheet comprises a substrate (1), the substrate (1) has an air inlet end (11) and an air outlet end (12) along the air flow direction, at least two heat exchange tube hole groups are arranged on the substrate (1) along the air flow direction, each heat exchange tube hole group comprises a plurality of heat exchange tube holes (2) arranged along the length direction of the substrate (1), wherein the heat exchange tube hole group closest to the air outlet end (12) of the substrate (1) is a first heat exchange tube hole group, the heat exchange tube hole (2) in the first heat exchange tube hole group is a first heat exchange tube hole (2a), the length direction of the substrate (1) intersects the air flow direction, and a heat exchange convex (3) is arranged on the backflow side area of the first heat exchange tube hole (2a) of the substrate (1), and the heat exchange convex (3) is continuously arranged in axial symmetry with the diameter of the first heat exchange tube hole (2a) along the air flow direction as the axis.
2. The heat exchange sheet according to claim 1, wherein The heat exchange convex (3) comprises a main body part (31), and the main body part (31) is arranged in the shape of a circular arc coaxial with the first heat exchange tube hole (2a).
3. The heat exchange sheet according to claim 2, wherein The two sides of the first heat exchange tube hole (2a) arranged oppositely along the length direction of the substrate (1) are also symmetrically provided with a flow disturbance structure.
4. The heat exchange sheet according to claim 3, wherein The minimum distance between the heat exchange convex (3) and the flow disturbance structure is 2-3 mm.
5. The heat exchange sheet according to claim 4, wherein The heat exchange convex (3) further comprises an extension part (32), and two extension parts (32) are arranged on the opposite sides of the main body part (31) along the length direction of the substrate (1), and the extension part (32) is arranged in the shape of a circular arc with the center pointing to the air outlet end (12).
6. The heat transfer sheet of claim 1, wherein The heat exchange tube hole group is provided with two groups, and the heat exchange tube hole group adjacent to the first heat exchange tube hole group is a second heat exchange tube hole group, the heat exchange tube hole (2) in the second heat exchange tube hole group is a second heat exchange tube hole (2b), the second heat exchange tube hole (2b) is arranged in a staggered manner along the length direction of the substrate (1) with the first heat exchange tube hole (2a), and a first notch (13) recessed in the air flow direction is arranged between two adjacent second heat exchange tube holes (2b), and the first notch (13) is opposite to the first heat exchange tube hole (2a).
7. The heat transfer sheet of claim 6, wherein The center line of the adjacent second heat exchange tube hole (2b) and the first heat exchange tube hole (2a) is a first preset center line (101), and the first notch (13) crosses the first preset center line (101).
8. The heat exchange sheet according to claim 7, wherein The maximum width of the first notch (13) along the length direction of the substrate (1) is not greater than the distance between the two ends of the heat exchange convex (3) along the length direction of the substrate (1).
9. The heat transfer sheet of claim 6, wherein The heat exchange sheet further comprises a heat exchange boss (5), and a plurality of heat exchange bosses (5) are arranged in the flow side area of the second heat exchange tube hole (2b) in a spaced manner around the second heat exchange tube hole (2b).
10. Heat exchanger, characterized in that The heat exchange sheet comprises a heat exchange tube and the heat exchange sheet of any one of claims 1-9, and the heat exchange sheets are arranged in layers, and a plurality of heat exchange tubes are arranged in the heat exchange tube holes (2).