A heat exchange plate

Abstract

The present application relates to heat exchange equipment field, especially a kind of heat exchange plate, including square plate body, plate body is built with the first edge that is folded to upside on its one set of opposite edge, the first edge of two sides and the plate body between it form upper air duct, the other set of opposite edge of plate body is respectively as the air inlet end and air outlet end of the upper air duct;The plate body top surface is arranged in the heat exchange region in the upper air duct and has multiple upward protruding support positioning boss with matrix arrangement and central symmetry;Plate body is built with the corrugation that is bent along its thickness direction;The corrugation is continuously or intermittently enclosed and arranged in the plate body outside multiple support positioning boss along circumferential direction.The heat exchange plate is built with the corrugation that is bent along its thickness direction on plate body, the setting of corrugation can increase the elasticity of plate body, can relieve the tension generated by thermal expansion and contraction, avoid plate tear damage.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heat exchange equipment, in particular to a heat exchange plate. BACKGROUND

[0002] The plate heat exchanger is used for heat transfer between fluids in energy recovery and electronic cooling and preheating systems in a ventilation system. The plate heat exchanger is used in an air heat exchanger, which can be applied to a heat recovery fresh air exchanger. While ventilating a place such as a residence, a shopping mall, a factory, and a data center, the heat recovery fresh air exchanger can recover cold and heat energy and reduce air conditioning energy consumption. The air heat exchanger can also be applied to industrial equipment heat recovery and natural cooling, such as a drying heat pump, a coating printing machine, and other places that need a heat source and need to discharge exhaust gas. The air heat exchanger recovers heat from the exhaust gas to reduce equipment energy input.

[0003] A heat exchange plate is disclosed in Chinese Utility Model Patent No. CN219103807U, which includes a square plate body. The plate body is provided with upwardly folded first folded edges on only one set of opposite edges. The plate body between the two first folded edges on the sides serves as an air duct. A plurality of upwardly protruding support positioning bosses are arranged in a matrix on the top surface of the plate body in the air duct and are centrally symmetrical. The support positioning bosses are constructed as streamlined bosses with the length direction extending in the direction of the air duct. The plate body is provided with a positioning groove on the back surface of the support positioning boss. When two heat exchange plates are stacked alternately, the support positioning boss of the lower heat exchange plate is inserted into the positioning groove of the upper heat exchange plate and is positioned. This scheme directly constructs the positioning mechanism in the support positioning boss and the positioning groove on the back surface thereof. On the one hand, the heat exchange area can be fully utilized to ensure the heat exchange efficiency. On the other hand, the upper and lower heat exchange plates are positioned in each region.

[0004] The above-mentioned heat exchange plate in the prior art has the following problems in actual application: the heat exchange plate has poor flexibility. When the heat exchange plate is used in an air heat exchanger for a long time, the heat exchange plate is prone to cracking due to thermal expansion and contraction caused by temperature changes on both sides of the heat exchange plate. SUMMARY

[0005] To solve the above-mentioned problems, the purpose of the present application is to provide a heat exchange plate. The plate body of the heat exchange plate is provided with corrugated folds bent along the thickness direction thereof. The arrangement of the corrugated folds can increase the flexibility of the plate body, relieve the tensile force caused by thermal expansion and contraction, and avoid tearing and damage of the plate.

[0006] To achieve the above-mentioned purposes, the present application adopts the following technical solutions:

[0007] The application discloses a heat exchange plate, which comprises a square plate body, a first fold edge is arranged on one set of opposite edges of the plate body and is turned up, an upper air duct is formed between the two first fold edges and the plate body, and the other set of opposite edges of the plate body is used as an air inlet end and an air outlet end of the upper air duct respectively; a plurality of upward supporting positioning bosses are arranged in the heat exchange area of the plate body in the upper air duct in a matrix mode and are centrally symmetrical; and the plate body is provided with a corrugated fold which is bent along the thickness direction of the plate body.

[0008] The heat exchange plate is used in a mode that a plurality of heat exchange plates are arranged in a 90-degree staggered mode, a longitudinal air duct and a transverse air duct are formed between two adjacent heat exchange plates and are used for feeding warm air and cold air respectively, and heat exchange is realized based on the heat exchange plate.

[0009] The corrugated fold is arranged on the plate body and is bent along the thickness direction of the plate body, the arrangement of the corrugated fold can increase the flexibility of the plate body, can relieve the tensile force caused by thermal expansion and cold contraction, and avoids tearing and damage of the plate.

[0010] Therefore, the corrugated fold is preferably arranged continuously in the circumferential direction.

[0011] In a further embodiment, the corrugated fold comprises a first fold on the air inlet end and the air outlet end of the upper air duct and a second fold in the two first fold edges; the first fold protrudes towards the back side of the upper air duct, and the second fold protrudes into the upper air duct.

[0012] Similarly, the second fold protrudes into the upper air duct; when multiple heat exchange plates are arranged in a 90° staggered manner, the second fold can avoid affecting the lower air duct, as described below.

[0013] In a further preferred embodiment, the second fold comprises a plurality of protruding ribs arranged in the air supply direction of the upper air duct. In this embodiment, the second fold protrudes into the upper air duct and is configured as a plurality of protruding ribs arranged in the air supply direction of the upper air duct; thus, the protruding ribs do not affect the air flow in the upper air duct, and can be used to increase the contact area with air and improve heat exchange efficiency.

[0014] As described above, the above-mentioned solution preferably continuously arranges the corrugated folds in the circumferential direction, and since the protruding directions of the first fold and the second fold are different. Therefore, in order to achieve the above-mentioned purpose, the end of the second fold and the end of the first fold are connected by an arc-shaped corner in this embodiment; the height of the front and rear ends of the second fold gradually decreases to the level of the first fold. Thus, based on the configuration of the gradually changing height of the end of the second fold, and the arc-shaped corner connecting the end of the second fold and the end of the first fold, the change in height of the first fold and the second fold can be achieved, thereby achieving the change in protruding direction. Moreover, during this gradual change, the arc-shaped corner can avoid affecting the air flow at the second fold.

[0015] In a preferred embodiment, the upper end of the first fold is not higher than the upper air duct side surface of the plate body, which can ensure that the first fold does not affect the air flow in the upper air duct.

[0016] In a further preferred embodiment, a plurality of reinforcing ribs protruding into the upper air duct are arranged on the plate body between the second fold and the adjacent first fold; the reinforcing ribs are arranged in the air supply direction of the upper air duct. The reinforcing ribs can be used to increase the strength of the plate body and increase the contact area with air to improve heat exchange efficiency.

[0017] In a further embodiment, the plate body is further provided with a downwardly folded second fold at the air inlet end and the air outlet end of the upper air duct; the plate body between the two second folds forms a lower air duct; the lower air duct is perpendicular to the upper air duct. When multiple heat exchange plates are arranged in a 90° staggered manner, the first fold of the lower heat exchange plate and the second fold of the upper heat exchange plate are stacked together, and the upper air duct of the lower heat exchange plate and the lower air duct of the upper heat exchange plate can be combined into a horizontal air duct or a vertical air duct.

[0018] As a preferred embodiment, the end of the first fold and the end of the second fold are connected by a bevel or an arc surface.

[0019] In the preferred embodiment, a plurality of convex ribs are further formed in the heat exchange region of the plate body and protrude into the downwind channel, the convex ribs are arranged along the air supply direction of the downwind channel, and the upper end surface of the convex ribs is not higher than the upwind channel side surface of the plate body. The plurality of convex ribs increase the strength of the plate body and increase the contact area with the air flow in the downwind channel. Moreover, the upper end surface of the convex ribs is not higher than the upwind channel side surface of the plate body, so as not to affect the air flow in the upwind channel.

[0020] As preferred, the support positioning boss is formed as a streamlined boss with the length direction extending along the upwind channel direction. In this embodiment, the support positioning boss is formed as a streamlined boss with the length direction extending along the wind channel direction, so as to reduce the fluid resistance of the air flowing into the wind channel. The plate body is provided with a positioning groove at the back of each support positioning boss. When the two heat exchange plates are stacked in an up-down staggered manner, the support positioning boss of the lower heat exchange plate is clamped into the positioning groove of the upper heat exchange plate and achieves circumferential positioning. In this embodiment, the positioning groove is formed at the back of each support positioning boss, and the support positioning boss of the lower heat exchange plate is clamped into the positioning groove of the upper heat exchange plate and achieves positioning. Thus, the support positioning boss supports the upper heat exchange plate to form a wind channel, and achieves rapid alignment and positioning of the two heat exchange plates. Compared with the prior art described in the background art, this embodiment omits the clamping cap and clamping groove arranged on the edge, and directly forms the positioning mechanism as the support positioning boss and the positioning groove at the back of the support positioning boss. On the one hand, it can fully utilize the heat exchange area and ensure the heat exchange efficiency. On the other hand, it can achieve positioning of the upper and lower heat exchange plates in each region, control the plate spacing error, ensure the uniformity of the plate gap, and ensure the strength of the stacked multiple plates.

[0021] In a further preferred embodiment, a small boss is formed at the root of the support positioning boss above the plate body. The small boss can further improve the overall strength of the support positioning boss. Moreover, the length direction ends of the small boss protrude from the width direction sides of the support positioning boss. Thus, it can increase the heat exchange area on the one hand, and the protruding part can generate a turbulence effect on the gas in the wind channel, so as to disrupt the temperature stratification of the air and improve the heat exchange efficiency.

[0022] In a specific embodiment, the convex ribs include long convex ribs and short convex ribs. In the downwind channel, the long convex ribs are arranged between adjacent two rows of positioning grooves, and a plurality of short convex ribs are arranged between adjacent two positioning grooves in the same row.

[0023] As preferred, the protruding parts of the length direction ends of the small boss relative to the support positioning boss are formed as circular arc end angles. The circular arc end angles can generate a turbulence effect and reduce the air resistance as much as possible.

[0024] As preferred, the length direction axis of the small boss is perpendicular to the upwind channel direction axis.

[0025] The heat exchange plate is made by a plastic suction method, the support positioning boss is configured to have a large root outer contour and a small top outer contour, and the annular sidewall of the support positioning boss is gradually inclined to the center from the root to the top. The structure of the support positioning boss with a small upper part and a large lower part can reduce the base material thinning rate during the plastic suction process. Further, the transverse cross section of the support positioning boss is configured to be elliptical or prismatic, and the long edge of the transverse cross section is configured to be a circular arc surface or an inclined surface. In this shape, the fluid resistance generated by the support positioning boss is minimized. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 FIG. 1 is a top perspective view of a heat exchange plate according to an embodiment of the present application.

[0027] Figure 2 FIG. 2 is a bottom perspective view of the heat exchange plate of FIG. 1. Figure 1 FIG. 3 is an enlarged view of A of FIG. 1.

[0028] Figure 3 FIG. 4 is an enlarged view of B of FIG. 1. Figure 1

[0029] Figure 4 FIG. 5 is a top perspective view of the heat exchange plate of FIG. 1, viewed from the opposite side.

[0030] Figure 5 FIG. 6 is an enlarged view of C of FIG. 1. Figure 4

[0031] FIG. 7 is a side view of the heat exchange plate of FIG. 1, viewed from the upper air duct inlet direction. Figure 6

[0032] FIG. 8 is a side view of the heat exchange plate of FIG. 1, viewed from the lower air duct inlet direction. Figure 7

[0033] FIG. 9 is a schematic view of a plurality of heat exchange plates 90° up and down staggered and stacked. Figure 8 DETAILED DESCRIPTION

[0034] Embodiments of the present application are described in detail below with reference to the attached drawings, which show by way of example, embodiments in which like numerals indicate like elements or elements having the same or similar function throughout the several views. The embodiments described below are examples intended to explain the present application, and are not to be understood as limiting the present application.

[0035] ​​In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0036] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more, unless otherwise explicitly limited.

[0037] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside 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.

[0038] In the present application, unless otherwise explicitly specified and limited, the first feature "above" or "below" the second feature can include the first and second features directly contacting, or the first and second features not directly contacting but contacting through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0039] As Figures 1-8As shown, the present embodiment relates to a heat exchange plate, which comprises a square plate body 1, the plate body 1 is constructed with a first fold edge 11 folded upward on one set of opposite edges, the first fold edge 11 and the plate body 1 therebetween form an upper air duct 10, and the other set of opposite edges of the plate body 1 respectively serve as the air inlet end 101 and the air outlet end 102 of the upper air duct 10. In one embodiment, the plate body 1 is constructed with a first fold edge 11 folded upward on only one set of opposite edges. As shown in Figure 1 and 4 In another scheme, the plate body 1 is further constructed with a second fold edge 12 folded downward on the air inlet end 101 and the air outlet end 102 of the upper air duct 10, and the end of the first fold edge 11 and the end of the second fold edge 12 are connected by a bevel or an arc. The second fold edge 12 and the plate body 1 therebetween form a lower air duct 100. The lower air duct 100 is perpendicular to the upper air duct. When a plurality of heat exchange plates are stacked vertically 90°, the first fold edge 11 of the lower heat exchange plate and the second fold edge 12 of the upper heat exchange plate are stacked together, and the upper air duct 10 of the lower heat exchange plate and the lower air duct 100 of the upper heat exchange plate can be combined into a transverse air duct or a longitudinal air duct.

[0040] As shown in Figure 1 , 2 , 4 and 5, the top surface of the plate body 1 is arranged in a matrix and symmetrically centered with a plurality of upward protruding support positioning bosses 13 in the heat exchange area within the upper air duct 10. The support positioning bosses 13 are constructed as streamlined bosses with the length direction extending in the direction of the upper air duct 10. In this scheme, the support positioning bosses are constructed as streamlined bosses with the length direction extending in the direction of the air duct, 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 of each support positioning boss 13. When two heat exchange plates are stacked vertically, the support positioning boss 13 of the lower heat exchange plate is inserted into the positioning groove 14 of the upper heat exchange plate and achieves circumferential positioning. In this scheme, the plate body 1 is constructed with a positioning groove 14 on the back of each support positioning boss 13, and the support positioning boss 13 of the lower heat exchange plate is inserted into the positioning groove 14 of the upper heat exchange plate and achieves positioning. The support positioning boss 13 supports the upper heat exchange plate to form an air duct, and achieves rapid alignment and positioning of the two heat exchange plates. Compared with the prior art described in the background art, this scheme omits the snap-on cap and the snap-on groove arranged on the edge, and directly constructs the positioning mechanism as the support positioning boss 13 and the positioning groove 14 on the back thereof. On the one hand, it can fully utilize the heat exchange area and ensure the heat exchange efficiency. On the other hand, it can achieve positioning of the upper and lower heat exchange plates in each area, control the plate spacing error, ensure the uniformity of the plate gap, and ensure the strength of the stacked plates.

[0041] In a further preferred embodiment, the positioning groove 14 is constructed with a small boss 15 at the root of the support positioning boss 13 above the plate body, which can further enhance the overall strength of the support positioning boss 13. Moreover, the lengthwise ends of the small boss 15 protrude from the widthwise sides of the support positioning boss 13, which can on the one hand increase the heat exchange area, and on the other hand the protruding parts can generate turbulence effects on the gas in the air duct, so as to be able to disrupt the temperature stratification of the air and improve the heat exchange efficiency. The protruding parts of the lengthwise ends of the small boss 15 relative to the support positioning boss 13 are constructed as circular arc end angles, which can reduce the air resistance generated by the small boss 15 as much as possible on the basis of generating turbulence. The lengthwise axis of the small boss 15 is perpendicular to the direction axis of the upper air duct 10.

[0042] The heat exchange plate described above is made by a vacuum forming method, and the support positioning boss 13 is constructed with a large root outer contour and a small top outer contour, and the annular side wall of the support positioning boss 13 gradually tilts towards the center from the root to the top. The structure of the support positioning boss 13 with a small upper part and a large lower part can reduce the substrate thinning rate during the vacuum forming process. Further, the transverse cross section of the support positioning boss 13 is constructed as an oval or a prismatic shape, and the long edge of the transverse cross section is constructed as a circular arc surface or an inclined surface. In this shape, the fluid resistance generated by the support positioning boss 13 is minimized.

[0043] The heat exchange plate described above is used by stacking multiple heat exchange plates 90° up and down, and constructing longitudinal air ducts and transverse air ducts between adjacent two heat exchange plates, which are respectively used for sending warm air and cold air, and realizing heat exchange based on the heat exchange plate. In this scheme, a group of opposite edges of the heat exchange plate are constructed as first folded edges, and multiple support positioning bosses 13 are arranged in a matrix inside the upper air duct between the two first folded edges on both sides. When the two plates are placed alternately, the upper heat exchange plate is erected on the first folded edges on both sides of the lower heat exchange plate, and the middle area is supported by the support positioning bosses 13, so as to ensure that the height of each area of the air duct formed between the two heat exchange plates is consistent.

[0044] On this basis, as shown in Figure 1 and 3 and 6 and 7, the plate body 1 is constructed with corrugated folds bent along the thickness direction thereof. The corrugated folds are continuously or discontinuously arranged on the plate body 1 outside the multiple support positioning bosses 13. In this scheme, the plate body 1 is constructed with corrugated folds 16 bent along the thickness direction thereof, and the arrangement of the corrugated folds 16 can increase the flexibility of the plate body 1, can relieve the tensile stress caused by thermal expansion and cold contraction, and avoid tearing and damage of the plate. Moreover, in this scheme, the corrugated folds 16 are required to be continuously or discontinuously arranged on the plate body 1 in the circumferential direction, so as to improve the tensile resistance of the plate body 1 in any direction in the circumferential direction.

[0045] Therefore, the corrugated folds 16 are preferably arranged continuously in the circumferential direction.

[0046] In a further embodiment, the corrugated folds 16 include first folds 161 on the air inlet end 101 and the air outlet end 102 of the upper air duct 10, and second folds 162 in the two side flaps 11. The first folds 161 protrude towards the back side of the upper air duct 10, and the second folds 162 protrude into the upper air duct 10. In this embodiment, the corrugated folds 16 arranged in the circumferential direction do not protrude in the same direction, but selectively protrude towards the two sides based on the air flow direction. Specifically, for the upper air duct 10, the air flow is from the air inlet end 101 to the air outlet end 102, so the first folds 161 protrude towards the back side of the upper air duct 10, which not only improves the tensile strength, but also avoids the influence of the first folds 161 on the air flow in the upper air duct 10. Similarly, the second folds 162 protrude into the upper air duct 10. Therefore, when the plurality of heat exchange plates are arranged in a 90° staggered manner, the influence of the second folds 162 on the lower air duct can be avoided, as described below.

[0047] In a further preferred embodiment, the second folds 162 include a plurality of ridges arranged in the air flow direction of the upper air duct. In this embodiment, the second folds 162 protrude into the upper air duct 10 and are constructed as a plurality of ridges arranged in the air flow direction of the upper air duct. In this way, the ridges do not affect the air flow in the upper air duct, and can be used to increase the contact area with the air and improve the heat exchange efficiency.

[0048] As described above, the corrugated folds 16 are preferably arranged continuously in the circumferential direction, and the protruding directions of the first folds 161 and the second folds 162 are different. Therefore, in order to achieve the above-mentioned purpose, the end of the second fold 162 and the end of the first fold 161 are connected by an arc-shaped corner 163. The height of the front and rear ends of the second fold 162 gradually decreases to the level of the first fold 161. In this way, by gradually changing the height of the end of the second fold 162 and connecting the end of the second fold 162 and the end of the first fold 161 by the arc-shaped corner 163, the change in height and the change in protruding direction of the first fold 161 and the second fold 162 can be achieved. Moreover, during the gradual change, the arc-shaped corner 163 can avoid affecting the air flow at the second fold 162.

[0049] In a preferred embodiment, the upper end of the first fold 161 is not higher than the upper air duct side surface of the plate body 1, which can ensure that the first fold 161 does not affect the air flow in the upper air duct 10.

[0050] In a further preferred embodiment, a plurality of reinforcing ribs 17 are formed on the plate body 1 between the second fold 162 and the first fold 11 adjacent thereto, and protrude into the upper air duct 10. The reinforcing ribs 17 are arranged in the air flow direction of the upper air duct 10. The reinforcing ribs 17 can be used to increase the strength of the plate body 1, and increase the contact area with air, thereby improving the heat exchange efficiency.

[0051] In a preferred embodiment, a plurality of convex ribs 18 are formed on the plate body 1 in the heat exchange region, and protrude into the lower air duct 100. The convex ribs 18 are arranged in the air flow direction of the lower air duct 100, and the upper end surface of the convex ribs 18 is not higher than the upper air duct side surface of the plate body 1. The plurality of convex ribs 18 can be used to increase the strength of the plate body 1, and increase the contact area with air in the lower air duct 100. Moreover, the upper end surface of the convex ribs 18 is not higher than the upper air duct side surface of the plate body 1, so that the air flow in the upper air duct is not affected. In a specific embodiment, the convex ribs 18 include long convex ribs 181 and short convex ribs 182. In the lower air duct 100, the long convex ribs 181 are 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.

[0052] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0053] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary, and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments without departing from the principles and spirit of the present application within the scope of the present application.

Claims

1. A heat exchange plate, comprising a square plate body (1), the plate body (1) is constructed with a first fold edge (11) turned up on one set of opposite edges, the two side first fold edges (11) and the plate body (1) therebetween form an upper air duct (10), the other set of opposite edges of the plate body (1) respectively serve as an air inlet end (101) and an air outlet end (102) of the upper air duct (10); the top surface of the plate body (1) is arranged in a matrix and has a plurality of upwardly protruding support positioning bosses (13) in a heat exchange region in the upper air duct (10) and is centrally symmetrical; characterized in that: The plate body (1) is provided with corrugated folds (16) bent along the thickness direction thereof; the corrugated folds (16) are continuously or discontinuously arranged on the plate body (1) outside the plurality of supporting positioning bosses (13) in the circumferential direction; the corrugated folds (16) include first folds (161) on the air inlet end (101) and the air outlet end (102) of the upper air duct (10) and second folds (162) in the two first folded edges (11); the first folds (161) protrude towards the back side of the upper air duct (10), and the second folds (162) protrude into the upper air duct (10); the end of the second fold (162) is transitioned to the end of the first fold (161) by an arc corner (163); the height of the front and rear ends of the second fold (162) gradually decreases from the end thereof to the same level as the first fold (161).

2. A heat transfer plate according to claim 1, characterized in that: The second fold (162) includes a plurality of convex ridges arranged in the air supply direction of the upper air duct.

3. A heat transfer plate according to claim 1, characterized in that: The upper end of the first fold (161) is not higher than the upper air duct side surface of the plate body (1).

4. A heat transfer plate according to claim 1, characterized in that: The plate body (1) between the second fold (162) and the adjacent first folded edge (11) is provided with a plurality of reinforcing ribs (17) protruding into the upper air duct (10); the reinforcing ribs (17) are arranged in the air supply direction of the upper air duct.

5. A heat transfer plate according to claim 1, characterized in that: The plate body (1) is further provided with a second folded edge (12) folded downward on the air inlet end (101) and the air outlet end (102) of the upper air duct (10); the plate body (1) between the two second folded edges (12) forms a lower air duct (100); the lower air duct (100) is perpendicular to the upper air duct.

6. A heat transfer plate according to claim 5, characterized in that: The end of the first folded edge (11) is transitionally connected to the end of the second folded edge (12) by a bevel or an arc surface.

7. A heat transfer plate according to claim 5, characterized in that: The plate body (1) is further provided with a plurality of convex ribs (18) protruding into the lower air duct (100) in the heat exchange region of the plate body (1); the convex ribs (18) are arranged in the air supply direction of the lower air duct (100), and the upper end surface of the convex ribs (18) is not higher than the upper air duct side surface of the plate body (1).

8. A heat transfer plate according to claim 7, characterized in that: The supporting positioning boss (13) is constructed as a streamlined boss with the length direction extending in the direction of the upper air duct (10); the plate body (1) is provided with a positioning groove (14) on the back of each supporting positioning boss (13); when the two heat exchange plates are stacked in an upper-lower staggered manner, the supporting positioning boss (13) of the lower heat exchange plate is clamped into the positioning groove (14) of the upper heat exchange plate and achieves circumferential positioning; the positioning groove (14) is formed with a small boss (15) at the root of the supporting positioning boss (13) above the plate body (1); the length direction ends of the small boss (15) protrude from the width direction sides of the supporting positioning boss (13).

9. A heat transfer plate according to claim 7, characterized in that: The convex ribs (18) include long convex ribs (181) and short convex ribs (182); in the lower air duct (100), the long convex ribs (181) are arranged between adjacent two positioning grooves (14), and a plurality of short convex ribs (182) are arranged between adjacent two positioning grooves (14) in the same column.

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