Heat exchange plate

Abstract

The utility model relates to the field of heat exchange equipment, in particular to a heat exchange plate which comprises a square plate body, an upper air duct is constructed in the space above the plate body, and a lower air duct is constructed in the space below the plate body. The lower air duct and the upper air duct are vertically staggered; corrugated wrinkles wrinkled in the thickness direction of the plate sheet body are constructed on the plate sheet body, and the corrugated wrinkles are arranged on the opposite edges of a heat exchange area of the plate sheet body and extend in the air channel direction of the upper air channel or the lower air channel. According to the heat exchange plate, the corrugated folds bent in the thickness direction of the plate body are constructed on the plate body and can increase the flexibility of the plate body, tension generated by thermal expansion and cold contraction is relieved, and the plate is prevented from being torn and damaged. In addition, only one group of opposite edges are provided with the corrugation wrinkles, so that the arrangement structure of the corrugation wrinkles can be simplified.

Description

Technical Field

[0001] The utility model relates to the field of heat exchange equipment, in particular to a heat exchange plate. Background Art

[0002] Plate heat exchangers are used for energy recovery in ventilation systems and heat transfer between fluids in systems such as electronic cooling and preheating. Plate heat exchangers are used in air heat exchangers and can be applied to heat recovery fresh air ventilators. These ventilate residences, shopping malls, factories, data centers, and other places while recovering heat and cooling energy, reducing air conditioning energy consumption. Air heat exchangers can also be used for heat recovery and free cooling in industrial equipment, such as drying heat pumps and coating and printing presses, which require a heat source and exhaust gas, recovering heat from exhaust gas to reduce equipment energy input.

[0003] For example, a Chinese utility model patent with the announcement number "CN219103807U" describes a heat exchange plate, which includes a square plate body. The plate body is constructed with an upward-folded first folded edge only on one set of its opposite edges. The plate body between the first folded edges on both sides serves as an air duct; the top surface of the plate body in the air duct has a plurality of upward-protruding support and positioning bosses arranged in a matrix and symmetrically around the center, and the support and positioning bosses are constructed as streamlined bosses extending in the direction of the air duct in the length direction; the plate body is constructed with a positioning groove on the back of the support and positioning boss. When two heat exchange plates are stacked up and down, the support and positioning boss of the lower heat exchange plate is inserted into the positioning groove of the upper heat exchange plate and positioned. This solution constructs the positioning mechanism directly in the support and positioning boss and the positioning groove on its back. On the one hand, it can fully utilize the heat exchange area and ensure heat exchange efficiency; on the other hand, it can realize the positioning of the upper and lower heat exchange plates in all areas.

[0004] The heat exchange plates described in the above-mentioned prior patents have the following problems in actual use: the heat exchange plates have poor elasticity. When used in an air heat exchanger for a long time, the heat exchange plates expand and contract due to the changes in temperature on both sides of the heat exchange plates, which can easily lead to the heat exchange plates breaking.

[0005] Building on this foundation, a prior patent, publication number "CN118347331A," describes a heat exchange plate comprising a square plate body with corrugated folds curved along its thickness. These corrugated folds are circumferentially arranged, either continuously or discontinuously, around the plate body, which is positioned outside a plurality of support and positioning bosses. This heat exchange plate features corrugated folds curved along its thickness. The arrangement of these corrugated folds increases the plate body's elasticity, mitigates tension caused by thermal expansion and contraction, and prevents tearing and damage. However, circumferentially arranging these corrugated folds presents significant challenges, particularly at corner transitions.

[0006] This solution aims to simplify the above-mentioned previously disclosed solution, and also solves the technical problem that heat exchange plates are prone to cracking due to thermal expansion and contraction. Summary of the Invention

[0007] In order to solve the above problems, the purpose of the present invention is to provide a heat exchange plate, which has corrugated folds bent along its thickness direction on the plate body. The setting of the corrugated folds can increase the elasticity of the plate body, alleviate the tension caused by thermal expansion and contraction, and avoid tearing and damage of the plate.

[0008] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0009] A heat exchange plate comprises a square plate body, wherein the plate body has a first folded edge folded upward or a second folded edge folded downward on a group of relative edges thereof, or a first folded edge folded upward and a second folded edge folded downward are respectively constructed on two groups of relative edges; the space above the plate body is constructed as an upper air duct, and the space below the plate body is constructed as a lower air duct; the lower air duct is vertically staggered with the upper air duct; one group of relative edges of the plate body serves as the upper air inlet end and the air outlet end of the upper air duct, and the other group of relative edges serves as the lower air inlet end and the lower air outlet end of the lower air duct; the top surface of the plate body is arranged in a matrix in the heat exchange area within the upper air duct and has a plurality of upwardly protruding supporting and positioning bosses symmetrically located at the center; it is characterized in that: the plate body is constructed with corrugated folds wrinkled along its thickness direction, and the corrugated folds are arranged on the relative edges of the heat exchange area of the plate body and extend along the air duct direction of the upper air duct or the lower air duct.

[0010] The present invention adopts the above-mentioned technical solution, which relates to a heat exchange plate. When in use, the heat exchange plate adopts a plurality of heat exchange plates that are stacked up and down at 90 degrees. A longitudinal air duct and a transverse air duct are constructed between two adjacent heat exchange plates, which are used to supply warm air and cold air respectively, and heat exchange is achieved based on the heat exchange plates. In this solution, a plurality of upwardly protruding support and positioning bosses are arranged in a matrix and symmetrically in the center in the heat exchange area in the upper air duct, and a first folded edge or a second folded edge is constructed on a group of relative edges, or a first folded edge and a second folded edge are constructed on two groups of relative edges respectively. When multiple plates are staggered, only the first folded edge or the second folded edge is used, or the second folded edge of the upper plate is mounted on the first folded edges on both sides of the lower heat exchange plate; the middle area is supported by the support and positioning bosses to ensure that the height of each area of the air duct formed between the two heat exchange plates is consistent.

[0011] Based on this, this solution incorporates corrugations along the plate's thickness. These corrugations increase the plate's elasticity, mitigate the tension caused by thermal expansion and contraction, and prevent tearing and damage. Unlike prior patents, this solution incorporates corrugations only on one set of opposing edges, simplifying the corrugation configuration and addressing the technical issue of heat exchange plates being susceptible to cracking due to thermal expansion and contraction.

[0012] Since the first folded edge and the second folded edge are components for stacking plates, the relative edge of the heat exchange area of the plate body referred to in the above solution refers to the area excluding the first folded edge and the second folded edge.

[0013] In one embodiment, the corrugated pleats protrude into the upper air duct, are arranged on both sides of the upper air duct, and extend along the airflow direction of the upper air duct. This solution arranges the corrugated pleats in the upper air duct and extends along the airflow direction of the upper air duct. In this way, the corrugated pleats increase the elasticity of the plate body while reducing their impact on the airflow volume in the upper air duct. In a specific embodiment, the corrugated pleats are arranged on the plate body between the first folded edges on both sides and the support and positioning bosses adjacent to the edges.

[0014] In another embodiment, the corrugated pleats protrude into the downwind duct, are arranged on both sides of the downwind duct, and extend along the downwind duct's airflow direction. This solution places the corrugated pleats within the downwind duct and extends along the downwind duct's airflow direction. This increases the elasticity of the plate body while reducing its impact on the downwind duct's airflow. In a specific embodiment, the corrugated pleats are arranged on the plate body inside the second folded edges on both sides.

[0015] In a specific embodiment, the corrugated folds include a plurality of ridges arranged on opposite edges of the plate body and extending along the air duct direction of the upper air duct or the lower air duct, and the plurality of ridges rise and fall in sequence to form the corrugated folds, which are used to increase the elasticity of the plate body.

[0016] In a further embodiment, the ends of the ridges are constructed to gradually decrease in height toward the ends until they are flush with the surface of the upper or lower duct. The above solution describes multiple ridges extending along the duct to reduce wind resistance. This solution requires that the ends of the ridges have a downward inclination, which further reduces the wind resistance generated by the ends of each ridge.

[0017] Preferably, the end of the first folded edge is connected to the end of the second folded edge through an inclined surface or an arc surface transition.

[0018] Preferably, the support and positioning bosses are constructed as streamlined bosses extending longitudinally in the direction of the upper air duct. The plate body has a positioning groove on the back of each support and positioning boss. When two heat exchange plates are stacked one above the other, the support and positioning boss of the lower heat exchange plate snaps into the positioning groove of the upper heat exchange plate, achieving circumferential positioning. In this solution, each support and positioning boss is constructed with a positioning groove on the back. The support and positioning boss of the lower heat exchange plate snaps into the positioning groove of the upper heat exchange plate, achieving positioning. In this way, the support and positioning bosses, while supporting the upper heat exchange plate to form an air duct, enable rapid alignment and positioning of the two heat exchange plates. Compared to the prior art described in the background art, this solution omits the snap-fit caps and snap-fit grooves provided on the edges, and instead constructs the positioning mechanism directly as the support and positioning bosses and the positioning grooves on their backs. This not only fully utilizes the heat exchange area and ensures heat exchange efficiency, but also ensures that the upper and lower heat exchange plates are positioned in all areas, controlling the plate spacing error and ensuring uniform plate spacing. This also ensures the strength of multiple plates when stacked.

[0019] Furthermore, the positioning groove is constructed to form a small boss at the root of the support positioning boss above the plate body, and the two ends of the small boss in the length direction protrude from the two sides of the support positioning boss in the width direction. This can increase the heat exchange area on the one hand, and on the other hand, the protruding part can produce a turbulent effect on the gas in the air duct, thereby disrupting the air temperature stratification and improving the heat exchange efficiency. In the specific solution, the two ends of the small boss are constructed with arc end angles relative to the protruding part of the support positioning boss. The arc end angles minimize the wind resistance to the airflow while causing turbulence. The longitudinal axis of the small boss is perpendicular to the axis of the upper air duct.

[0020] In a preferred embodiment, the heat exchange area of the plate body is further configured with multiple ribs protruding from the downwind duct. These ribs are arranged along the airflow direction of the downwind duct, with their upper end surfaces no higher than the surface of the plate body on the upwind duct side. These multiple ribs not only increase the strength of the plate body but also increase the contact area with the airflow in the downwind duct. Furthermore, the upper end surfaces of the ribs are no higher than the surface of the plate body on the upwind duct side, thus not affecting the airflow in the upwind duct.

[0021] In a specific embodiment, the convex ribs include long convex ribs and short convex ribs; in the downwind duct, the long convex ribs are arranged between two adjacent rows of positioning grooves, and a plurality of short convex ribs are arranged between two adjacent positioning grooves in the same row. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a three-dimensional view of the heat exchange plate from the top view.

[0023] Figure 2 for Figure 1 Magnified view of part A.

[0024] Figure 3 This is a three-dimensional view of the bottom surface of the heat exchange plate.

[0025] Figure 4 for Figure 3 Enlarged view of part B.

[0026] Figure 5 Schematic diagram of the side structure of the heat exchange plate. DETAILED DESCRIPTION

[0027] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, "plurality" means two or more, unless expressly limited otherwise.

[0030] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0031] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0032] like Figures 1 to 5 As shown, this embodiment relates to a heat exchange plate, including a square plate body 1. In one embodiment, the plate body 1 is constructed with a first folded edge 11 folded upward or a second folded edge 12 folded downward on a set of opposite edges. That is, the first folded edge 11 or the second folded edge 12 is only provided on one set of opposite edges, and the two adjacent heat exchange plates are separated vertically by the first folded edge 11 or the second folded edge 12. In a more preferred embodiment, as shown in the figure, a first folded edge 11 folded upward and a second folded edge 12 folded downward are respectively constructed on two sets of opposite edges of the plate body 1, and the ends of the first folded edge 11 and the ends of the second folded edge 12 are connected by a bevel or arc surface transition. When in use, the second folded edge 12 of the upper plate is placed on the first folded edges on both sides of the lower heat exchange plate, thereby separating the two adjacent heat exchange plates vertically. When the heat exchange plate is in use, multiple heat exchange plates are stacked up and down at 90 degrees. A longitudinal air duct and a transverse air duct are formed between two adjacent heat exchange plates, which are used to supply warm air and cold air respectively, and heat exchange is achieved based on the heat exchange plates. In this solution, a plurality of upwardly protruding support and positioning bosses 13 are arranged in a matrix and symmetrically in the center in the heat exchange area within the upper air duct 10, and a first folded edge 11 or a second folded edge 12 is constructed on a set of opposite edges, or a first folded edge 11 and a second folded edge 12 are constructed on two sets of opposite edges. When multiple plates are staggered, only the first folded edge 11 or the second folded edge 12 is used, or the second folded edge 12 of the upper plate is mounted on the first folded edges on both sides of the lower heat exchange plate.

[0033] The space above the plate body 1 is constructed as an upper air duct 10, shown as the area between the two first folded edges 11. The space below the plate body 1 is constructed as a lower air duct 20, shown as the area between the two second folded edges 12. The lower air duct 20 is perpendicularly staggered with the upper air duct 10. One set of opposing edges of the plate body 1 serves as the upper air inlet end 101 and air outlet end 102 of the upper air duct 10, while the other set of opposing edges serves as the lower air inlet end 201 and lower air outlet end 202 of the lower air duct 20.

[0034] like Figures 1 to 5 As shown, the top surface of the plate body 1 is arranged in a matrix in the heat exchange area within the upper air duct 10 and has a plurality of upwardly protruding support and positioning bosses 13 symmetrically in the center. When the above-mentioned heat exchange plate is used, when multiple heat exchange plates are stacked up and down at 90 degrees, the middle area is supported by the support and positioning bosses 13 to ensure that the height of each area of the air duct formed between the two heat exchange plates is consistent. Specifically, the support and positioning bosses 13 are constructed as streamlined bosses extending in the direction of the upper air duct 10 in the length direction. The support and positioning bosses in this solution are constructed as streamlined bosses extending in the direction of the air duct in the length direction, which can reduce the fluid resistance of the air flowing into the air duct. The plate body 1 is constructed with a positioning groove 14 on the back side of each support and positioning boss 13. When two heat exchange plates are stacked up and down in an alternating manner, the support and positioning boss 13 of the lower heat exchange plate is inserted into the positioning groove 14 of the upper heat exchange plate to achieve circumferential positioning. This solution constructs a positioning groove 14 on the back of each supporting positioning boss, and the supporting positioning boss 13 of the lower heat exchange plate is snapped into the positioning groove 14 of the upper heat exchange plate to achieve positioning. In this way, the supporting positioning boss 13 supports the upper heat exchange plate to form an air duct, thereby achieving rapid alignment and positioning of the two heat exchange plates. Compared with the existing technology described in the background technology, this solution omits the snap-fitting cap and snap-fitting groove set on the edge, and directly constructs the positioning mechanism as the supporting positioning boss 13 and the positioning groove 14 on the back thereof. On the one hand, it can make full use of the heat exchange area and ensure heat exchange efficiency. On the other hand, it can achieve positioning of the upper and lower heat exchange plates in all areas, control the plate spacing error, ensure uniform plate gap, and at the same time ensure the strength of multiple plates after stacking.

[0035] In a further preferred embodiment, the positioning groove 14 is formed with a small boss 15 at the root of the support positioning boss 13 above the plate body. The small boss 15 can further enhance the overall strength of the support positioning boss 13. In addition, the two ends of the small boss 15 in the length direction protrude from both sides of the width direction of the support positioning boss 13. This can increase the heat exchange area on the one hand, and on the other hand, the protruding part can produce a turbulent effect on the gas in the air duct, thereby disrupting the air temperature stratification and improving the heat exchange efficiency. The two ends of the small boss 15 are constructed as arc end angles relative to the protruding parts of the support positioning boss 13. The arc end angles can minimize the wind resistance to the airflow as much as possible on the basis of turbulence. The longitudinal axis of the small boss 15 is perpendicular to the directional axis of the upper air duct 10.

[0036] The heat exchange plate is manufactured using a vacuum forming process. The support and positioning boss 13 is constructed with a larger outer contour from the base and a smaller outer contour at the top. The annular sidewall of the support and positioning boss 13 gradually tilts toward the center from its base to the top. The structure of the support and positioning boss 13, which is smaller at the top and larger at the bottom, can reduce the substrate thinning rate during the vacuum forming process. Furthermore, the transverse cross-section of the support and positioning boss 13 is constructed into an elliptical or prismatic shape, and the long side edge of the transverse cross-section is constructed as a circular arc surface or an inclined surface. With this shape, the fluid resistance generated by the support and positioning boss 13 is minimized.

[0037] In a more preferred embodiment, the heat exchange area of the plate body 1 is further configured with multiple ribs 18 protruding from the downwind duct 20. The ribs 18 are arranged along the air supply direction of the downwind duct 20, and the upper end surfaces of the ribs 18 are no higher than the upper duct side surface of the plate body 1. The multiple ribs 18 not only increase the strength of the plate body 1, but also increase the contact area with the airflow in the downwind duct 20. Furthermore, the upper end surfaces of the ribs 18 are no higher than the upper duct side surface of the plate body 1, thus not affecting the airflow in the upper duct. In a specific embodiment, the ribs 18 include long ribs 181 and short ribs 182. Within the downwind duct 20, the long rib 181 is arranged between two adjacent rows of positioning grooves 14, and multiple short ribs 182 are arranged between two adjacent positioning grooves 14 in the same row.

[0038] like Figure 1 and 3 As shown, this solution features corrugations that bend along the plate's thickness. These corrugations increase the plate's elasticity, mitigate tension caused by thermal expansion and contraction, and prevent tearing and breakage. Unlike prior patents, this solution incorporates corrugations only on one set of opposing edges, simplifying the corrugation configuration and addressing the technical issue of heat exchange plates being susceptible to cracking due to thermal expansion and contraction.

[0039] In a specific embodiment, the corrugated pleats 16 are arranged on the opposite edges of the heat exchange area of the plate body 1 and extend along the air duct direction of the upper air duct 10 or the lower air duct 20. In one embodiment shown in the figure, the corrugated pleats 16 protrude into the upper air duct 10, and the corrugated pleats 16 are arranged on both sides of the upper air duct and extend along the air duct direction of the upper air duct 10. This embodiment arranges the corrugated pleats 16 in the upper air duct and extends along the air duct direction of the upper air duct 10, so that the corrugated pleats 16 increase the elasticity of the plate body while reducing its impact on the air volume of the upper air duct. In a specific embodiment, the corrugated pleats 16 are arranged on the plate body 1 between the first folded edges 11 on both sides and the support and positioning bosses 13 adjacent to the edges.

[0040] In another embodiment [illustration omitted], the corrugated pleats 16 protrude into the downwind duct 20, are arranged on both sides of the downwind duct 20, and extend along the airflow direction of the downwind duct 20. This solution places the corrugated pleats 16 in the downwind duct 20 and extends along the airflow direction of the downwind duct 20. This increases the elasticity of the plate body while reducing its impact on the airflow volume in the downwind duct. In a specific embodiment, the corrugated pleats 16 are arranged on the plate body 1 inside the second folded edge 12 on both sides.

[0041] like Figure 1 and 5 As shown, the corrugated folds 16 include a plurality of ridges 161 extending along the air duct direction of the upper air duct 10 or the lower air duct 20 on the opposite edges of the plate body 1. The plurality of ridges 161 rise and fall in sequence to form the corrugated folds 16, which are used to increase the elasticity of the plate body. In a further embodiment, the two ends of the ridges 161 are constructed so that the height gradually decreases toward the end until it is flush with the surface of the upper air duct 10 or the lower air duct 20. The above scheme records that the plurality of ridges 161 extend along the air duct direction, which can be used to reduce wind resistance. The scheme here requires that the two ends of the ridges 161 have a downward tilt, which can further reduce the wind resistance generated by the ends of each ridge 161.

[0042] In summary, the heat exchange plate is provided with corrugated folds 16 on both sides of the upper air duct 10 or the lower air duct 20 to increase the elasticity of the plate body, thereby alleviating the tension caused by thermal expansion and contraction and preventing the plate from being torn and damaged.

[0043] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations 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 any suitable manner in any one or more embodiments or examples.

[0044] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A heat exchange plate, comprising a square plate body (1), wherein the plate body (1) is constructed with a first folded edge (11) folded upward or a second folded edge (12) folded downward on a set of opposite edges thereof, or the first folded edge (11) folded upward and the second folded edge (12) folded downward are respectively constructed on two sets of opposite edges; the space above the plate body (1) is constructed as an upper air duct (10), and the space below the plate body (1) is constructed as a lower air duct (20). The downwind duct (20) and the upwind duct (10) are vertically interlaced; one set of relative edges of the plate body (1) serves as the upper air inlet end (101) and the air outlet end (102) of the upwind duct (10), and the other set of relative edges serves as the lower air inlet end (201) and the lower air outlet end (202) of the downwind duct (20); the top surface of the plate body (1) is arranged in a matrix in the heat exchange area within the upwind duct (10) and has a plurality of upwardly protruding support and positioning bosses (13) symmetrically located at the center; the characteristics are: The plate body (1) is provided with corrugated folds (16) wrinkled along its thickness direction. The corrugated folds (16) are arranged on opposite edges of the heat exchange area of the plate body (1) and extend along the air duct direction of the upper air duct (10) or the lower air duct (20).

2. The heat exchange plate according to claim 1, characterized in that: The corrugated folds (16) protrude into the upper air duct (10), and the corrugated folds (16) are arranged on both sides of the upper air duct and extend along the air duct direction of the upper air duct (10).

3. The heat exchange plate according to claim 2, characterized in that: The corrugated folds (16) are arranged on the plate body (1) between the first folded edges (11) on both sides and the supporting positioning bosses (13) adjacent to the edges.

4. The heat exchange plate according to claim 1, characterized in that: The corrugated folds (16) protrude toward the inside of the downwind duct (20), and the corrugated folds (16) are arranged on both sides of the downwind duct (20) and extend along the duct direction of the downwind duct (20).

5. The heat exchange plate according to claim 4, characterized in that: The corrugated folds (16) are arranged on the plate body (1) inside the second folded edges (12) on both sides.

6. A heat exchange plate according to any one of claims 1 to 5, characterized in that: The corrugated folds (16) include a plurality of ridges (161) arranged on opposite edges of the plate body (1) and extending along the air duct direction of the upper air duct (10) or the lower air duct (20).

7. The heat exchange plate according to claim 6, characterized in that: The two ends of the ridge (161) are constructed so that their height gradually decreases toward the end until they are flush with the surface of the upper air duct (10) or the lower air duct (20).

8. The heat exchange plate according to claim 1, characterized in that: The end of the first folded edge (11) and the end of the second folded edge (12) are connected via an inclined surface or an arcuate surface transition.

9. The heat exchange plate according to claim 1, characterized in that: The support positioning boss (13) is constructed as a streamlined boss extending in the direction of the upper air duct (10) in the longitudinal direction. The plate body (1) is constructed with a positioning groove (14) on the back of each support positioning boss (13). When two heat exchange plates are stacked up and down, the support positioning boss (13) of the lower heat exchange plate is inserted into the positioning groove (14) of the upper heat exchange plate to achieve circumferential positioning. The positioning groove (14) is constructed with a small boss (15) at the root of the support positioning boss (13) above the plate body (1). The two ends of the small boss (15) in the longitudinal direction protrude from both sides of the support positioning boss (13) in the width direction.

10. The heat exchange plate according to claim 1, characterized in that: A plurality of convex ribs (18) protruding toward the downwind duct (20) are also constructed in the heat exchange area of the plate body (1). The convex ribs (18) are arranged along the air supply direction of the downwind duct (20), and the upper end surface of the convex ribs (18) is not higher than the upwind duct side surface of the plate body (1); the convex ribs (18) include long convex ribs (181) and short convex ribs (182); in the downwind duct (20), the long convex rib (181) is arranged between two adjacent rows of positioning grooves (14), and a plurality of short convex ribs (182) are arranged between two adjacent positioning grooves (14) in the same row.

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