Heat exchange plate

Abstract

The present invention relates to the field of heat exchange devices, and in particular to a heat exchange plate, comprising a square plate body. First folded edges bent upward are formed at one pair of opposite edges of the plate body, the first folded edges on two sides and the plate body between the first folded edges form an upper air passage, and the other pair of opposite edges of the plate body respectively serves as an air inlet end and an air outlet end of the upper air passage; a heat exchange area of the top surface of the plate body in the upper air passage is provided with a plurality of upwardly protruding support and positioning bosses, which are centrally symmetrically arranged in a matrix; corrugated folds bent in the thickness direction of the plate body are constructed on the plate body; and the corrugated folds are arranged, in a surrounding mode, continuously or intermittently in the circumferential direction on the plate body outside the plurality of support and positioning bosses. The plate body of the heat exchange plate is provided with the corrugated folds bent in the thickness direction of the plate body, and the provision of the corrugated folds can increase the extensibility of the plate body, alleviate tension caused by thermal expansion and contraction, and prevent tearing and damage of the plate body.

Description

Heat exchange plate TECHNICAL FIELD

[0001] The present application relates to the field of heat exchange equipment, and 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 printer, 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 a 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 heat exchange plate disclosed in the prior patent 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 expands and contracts due to changes in cold and warm on both sides, which easily causes the heat exchange plate to break. SUMMARY

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

[0010] Therefore, the corrugated fold is preferably arranged continuously along 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 gradual change of the 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 turbulent flow 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 two ends of the small boss relative to the support positioning boss are formed as circular arc end angles. The circular arc end angles can reduce the air resistance generated by the turbulent flow 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 the small upper part and the large lower part can reduce the base material thinning rate in the plastic suction process. Further, the transverse section of the support positioning boss is configured to be elliptical or prismatic, and the long edge of the transverse 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 minimum. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 is a top view perspective view of the heat exchange plate.

[0027] Fig. 2 is an enlarged view of part A of Fig. 1.

[0028] Fig. 3 is an enlarged view of part B of Fig. 1.

[0029] Fig. 4 is a bottom view perspective view of the heat exchange plate.

[0030] Fig. 5 is an enlarged view of part C of Fig. 4.

[0031] Fig. 6 is a side view of the upper air duct of the heat exchange plate in the air inlet direction.

[0032] Fig. 7 is a side view of the lower air duct of the heat exchange plate in the air inlet direction.

[0033] Fig. 8 is a schematic view of a plurality of heat exchange plates stacked in a 90° up-down staggered manner. DETAILED DESCRIPTION

[0034] The embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below are examples for explaining the present application and should not be construed as limiting the present application.

[0035] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be construed as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application.

[0036] In addition, the terms "first", "second", "third", etc. are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or an ordered sequence. Thus, features having a "first", "second" or "third" designation can include one or more of the features, either explicitly or implicitly.

[0037] In the present application, unless specifically stated and limited otherwise, the terms "mounting", "connecting", "connecting", "fixing" and the like are to be broadly construed, for example, can be fixedly connected, or can be detachably connected, or can be integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be connected internally between 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 specifically stated and limited otherwise, "on" or "under" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "above" of the first feature to the second feature includes that the first feature is 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. "Below", "below" and "below" of the first feature to the second feature includes that the first feature is 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 shown in FIGS. 1-8, the present embodiment relates to a heat exchange plate, which comprises a square plate body 1, the plate body 1 is provided with a first folded edge 11 turned up on one set of opposite edges, the upper air duct 10 is formed between the two sides of the first folded edge 11 and the plate body 1 therebetween, and the other set of opposite edges of the plate body 1 are respectively used 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 provided with a first folded edge 11 turned up on only one set of opposite edges. In another embodiment as shown in FIGS. 1 and 4, the plate body 1 is further provided with a second folded edge 12 turned down on the air inlet end 101 and the air outlet end 102 of the upper air duct 10, and the end of the first folded edge 11 and the end of the second folded edge 12 are connected by a bevel or an arc. The lower air duct 100 is formed between the two sides of the second folded edge 12 and the plate body 1 therebetween. The lower air duct 100 is perpendicular to the upper air duct. When a plurality of heat exchange plates are arranged in a 90° up-down staggered manner, the first folded edge 11 of the lower heat exchange plate and the second folded 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 FIG. 1, 2, 4 and 5, the plate body 1 top surface is arranged in a matrix in the heat exchange area in the upper air duct 10 and is centrally symmetric with a plurality of upwardly protruding support positioning bosses 13. The support positioning boss 13 is constructed as a streamlined boss with the length direction extending along the direction of the air duct 10. In this scheme, the support positioning boss is constructed as a streamlined boss with the length direction extending along the direction of the air duct. In this way, the fluid resistance of the air flowing into the air duct can be reduced. The plate body 1 is constructed with a positioning groove 14 on the back of each support positioning boss 13. When the two heat exchange plates are stacked alternately, the support 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. In this scheme, the positioning groove 14 is constructed on the back of each support positioning boss. The support positioning boss 13 of the lower heat exchange plate is clamped into the positioning groove 14 of the upper heat exchange plate and achieves positioning. In this way, the support positioning boss 13 supports the upper heat exchange plate to form the air duct, and achieves the 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-fit cap and snap-fit groove provided 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 two heat exchange plates in each area, control the plate spacing error, ensure the uniformity of the plate gap, and at the same time ensure the strength of the stacked multiple plates.

[0041] In a further preferred scheme, the positioning groove 14 is constructed with a small boss 15 at the root of the support positioning boss 13 above the plate body. The small boss 15 can further improve the overall strength of the support positioning boss 13. Moreover, the length direction both ends of the small boss 15 protrude from the width direction both sides of the support positioning boss 13. In this way, on the one hand, the heat exchange area can be increased, and on the other hand, the protruding part can generate a turbulent flow effect 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 part of the both ends of the small boss 15 relative to the support positioning boss 13 is constructed as a circular arc end angle. The circular arc end angle can reduce the wind resistance generated to the airflow on the basis of generating a turbulent flow. The length direction 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 the suction molding method. The support positioning boss 13 is constructed as large from the root to small at the top, and the annular side wall of the support positioning boss 13 gradually tilts to the center from the root to the top. The structure of the support positioning boss 13 with the small top and the large bottom can reduce the substrate thinning rate in the suction molding process. Further, the transverse cross section of the support positioning boss 13 is constructed as an ellipse or a prism, 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 the smallest.

[0043] The heat exchange plates are arranged in a 90° staggered manner in use, and the longitudinal and transverse air ducts are formed between the adjacent two heat exchange plates for feeding warm air and cold air respectively, and heat exchange is realized based on the heat exchange plates. In the scheme, the first folded edges are formed on a group of opposite edges of the heat exchange plates, and a plurality of support positioning bosses 13 are arranged in the upper air duct in a matrix manner and symmetrically at the center between the two first folded edges. When the two heat exchange plates are arranged in a staggered manner, the two first folded edges of the upper heat exchange plate are arranged on the two first folded edges of the lower heat exchange plate, and the middle region is supported by the support positioning bosses 13 to ensure that the heights of the air ducts formed between the two heat exchange plates are consistent.

[0044] On this basis, as shown in FIGS. 1, 3, 6 and 7, the plate body 1 is provided with corrugated folds bent along the thickness direction thereof. The corrugated folds are arranged continuously or discontinuously on the plate body 1 outside the plurality of support positioning bosses 13 in a circumferential direction. In the scheme, the corrugated folds 16 are arranged on the plate body 1 and bent along the thickness direction thereof. The arrangement of the corrugated folds 16 can increase the flexibility of the plate body 1, can relieve the tensile force caused by thermal expansion and cold contraction, and can avoid tearing and damage of the plate. In the scheme, the corrugated folds 16 are arranged continuously or discontinuously on the plate body 1 in a circumferential direction. In this way, the tensile resistance of the plate body 1 in any circumferential direction is improved.

[0045] Therefore, in the scheme, the corrugated folds 16 are arranged continuously in a 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 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. In the scheme, the circumferentially arranged corrugated folds 16 do not protrude in the same direction, but selectively protrude towards the two thickness sides based on the air direction. Specifically, for the upper air duct 10, the air flows from the air inlet end 101 to the air outlet end 102, so that the first folds 161 protrude towards the back side of the upper air duct 10 in the scheme, which not only improves the tensile resistance, 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 a 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 corrugation 162 comprises a plurality of ridges arranged along the air flow direction of the upper air duct. In this embodiment, the second corrugation 162 protrudes into the upper air duct 10 and is configured as a plurality of ridges arranged along the air flow direction of the upper air duct. The ridges 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.

[0048] As described above, the above-mentioned embodiment preferably continuously arranges the corrugation 16 in the circumferential direction, and the protruding directions of the first corrugation 161 and the second corrugation 162 are different. Therefore, in order to achieve the above-mentioned purpose, the present embodiment uses an arc-shaped corner 163 to transition the end of the second corrugation 162 to the end of the first corrugation 161. The height of the front and rear ends of the second corrugation 162 gradually decreases to the level of the first corrugation 161. In this way, based on configuring the height of the end of the second corrugation 162 to gradually change, and using an arc-shaped corner 163 to connect the end of the second corrugation 162 to the end of the first corrugation 161, the height of the first corrugation 161 and the second corrugation 162 can be changed, thereby achieving the change in the protruding direction. Moreover, during this gradual change, the arc-shaped corner 163 can avoid affecting the air flow at the second corrugation 162 in the gradual change section.

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

[0050] In a further preferred embodiment, a plurality of reinforcing ribs 17 protruding into the upper air duct 10 are configured on the plate body 1 between the second corrugation 162 and the adjacent first folded edge 11. The reinforcing ribs 17 are arranged along the air flow direction of the upper air duct. The reinforcing ribs 17 can be used to increase the strength of the plate body 1, and increase the contact area with air to improve heat exchange efficiency.

[0051] In a preferred embodiment, a plurality of protruding ribs 18 protruding into the lower air duct 100 are further configured in the heat exchange region of the plate body 1. The protruding ribs 18 are arranged along the air flow direction of the lower air duct 100, and the upper end surface of the protruding ribs 18 is not higher than the upper air duct side surface of the plate body 1. The plurality of protruding ribs 18 increase the strength of the plate body 1, and also increase the contact area with air in the lower air duct 100. Moreover, the upper end surface of the protruding ribs 18 is not higher than the upper air duct side surface of the plate body 1, so it does not affect the air flow in the upper air duct. In a specific embodiment, the protruding ribs 18 comprise long protruding ribs 181 and short protruding ribs 182. In the lower air duct 100, the long protruding ribs 181 are arranged between two adjacent rows of positioning grooves 14, and a plurality of short protruding ribs 182 are arranged between two adjacent positioning grooves 14 in the same row.

[0052] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. 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 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 is understood that the above-described 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-described embodiments within the scope of the present application without departing from the principles and spirit 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 outer side of the plate body (1) outside the plurality of supporting positioning bosses (13) in the circumferential direction.

2. A heat transfer plate according to claim 1, characterized in that: 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).

3. A heat transfer plate according to claim 2, characterised in that: The second folds (162) include a plurality of ridges arranged in the air supply direction of the upper air duct.

4. A heat transfer plate according to claim 2, characterized in that: The end of the second fold (162) and the end of the first fold (161) are transitioned by an arc corner (163); the height of the front and rear ends of the second fold (162) gradually decreases to the end to be flush with the first fold (161).

5. A heat transfer panel according to claim 2 or 4, characterised 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).

6. A heat transfer plate according to claim 2, characterized in that: The plate body (1) between the second fold (162) and the first folded edge (11) adjacent thereto 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.

7. 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.

8. A heat transfer plate according to claim 7, characterized in that: The end of the first folded edge (11) and the end of the second folded edge (12) are transitionally connected by a bevel or an arc surface.

9. A heat transfer plate according to claim 7, 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).

10. A heat transfer plate according to claim 9, 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 inserted 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 both ends of the small boss (15) protrude from the width direction both sides of the supporting positioning boss (13).

11. A heat transfer plate according to claim 9, 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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