Heat exchange plates, plate heat exchangers and heat exchange systems

Abstract

The present invention provides a heat exchange plate, a plate heat exchanger, and a heat exchange system. A plurality of first protrusions and a plurality of first depressions of a first micro-element group of the heat exchange plate are alternately arranged in the width direction of the heat exchange plate, and a plurality of second protrusions and a plurality of second depressions of a second micro-element group are alternately arranged in the width direction. The first welding surface of the first protrusion away from the first depression has a first long side axis and a first short side axis that are perpendicular to each other. The first long side axis has an inclined angle with the length direction, and the plurality of first long side axes gradually decrease from the first side toward the second side in the width direction. The plurality of first short side axes have the same size. The heat exchange plate of the present invention can achieve uniform distribution of flow velocity and flow while effectively reducing the flow dead zone area to increase the effective heat exchange area, and can effectively enhance the ability to disturb the fluid medium, further improving the uniformity of flow velocity and flow, and improving heat exchange performance.

Description

Technical Field

[0001] The present invention relates to the field of heat exchange technology, and in particular to a heat exchange plate, a plate heat exchanger having the heat exchange plate, and a heat exchange system having the plate heat exchanger. Background Art

[0002] A plate heat exchanger is a highly efficient heat exchanger composed of multiple stacked metal plates with a specific point-wave heat exchange structure. The point-wave heat exchange structure of two adjacent plates forms interlaced fluid channels, allowing the cold and hot fluids to flow through the adjacent channels, exchanging heat. Plate heat exchangers offer high heat exchange efficiency, light weight, minimal footprint, compact structure, and long service life. They are widely used in cooling and heating, waste heat recovery, chemical engineering, aerospace, and automotive batteries, and have a significant market and development prospects.

[0003] In order to increase the heat exchange area, the heat exchange plates of existing plate heat exchangers are generally provided with circulation ports for the entry and exit of cold fluid and hot fluid at the four corners of the plate body. The flow velocity of the fluid medium close to the circulation port in the fluid channel is relatively large, while the flow velocity of the fluid medium away from the circulation port in the fluid channel is relatively small. This leads to uneven distribution of the flow velocity of the fluid medium in the fluid channel, resulting in a smaller flow rate of the fluid medium away from the circulation port in the fluid channel, which results in the heat exchange area of ​​the heat exchange plate not being fully utilized, thereby reducing the heat exchange efficiency and the heat exchange effect. In severe cases, a stagnant dead zone will be formed locally, which is prone to freezing and cracking under low temperature conditions, leading to failure or paralysis of the heat exchange system.

[0004] In order to achieve uniform distribution of the fluid medium in the fluid channel, the heat exchange plates of the existing plate heat exchanger are configured to gradually change the width of the welding surface of the convex and concave parts in the point wave heat exchange structure by changing the width of the welding surface of the convex and concave parts. That is, the width of the welding surface of the convex and concave parts gradually becomes wider or narrower, or first becomes wider and then narrower, or first becomes narrower and then widen, in the width direction of the heat exchange plate.

[0005] However, the existing method of changing the width of the welding surface of the convex and concave parts has the phenomenon of excessively increasing the size of the welding surface of the convex and concave parts and excessively reducing the size of the welding surface of the convex and concave parts. Excessively increasing the size of the welding surface of the convex and concave parts results in an oversized welding area being formed between the oversized welding surfaces of the convex and concave parts of two adjacent heat exchange plates, resulting in an increase in the flow dead zone area in the oversized welding area after welding, thereby increasing the invalid resistance and reducing the effective heat exchange area of ​​the heat exchange plate. Moreover, the excessive reduction of the size of the welding surface of the convex and concave parts results in an oversized welding area being formed between the oversized welding surfaces of the convex and concave parts of two adjacent heat exchange plates. The flow disturbance effect of the oversized welding area is poor, resulting in insufficient heat exchange capacity. Therefore, the existing method of changing the width of the welding surface of the convex and concave parts results in poor disturbance ability of the convex and concave parts on the fluid medium, thereby affecting the heat exchange effect and heat exchange efficiency. Summary of the Invention

[0006] The first purpose of the present invention is to provide a heat exchange plate that can effectively reduce the flow dead zone area to increase the effective heat exchange area while achieving uniform distribution of flow rate and flow, and can effectively enhance the disturbance ability of the fluid medium, further improve the uniformity of flow rate and flow, and improve the heat exchange performance.

[0007] A second object of the present invention is to provide a plate heat exchanger having the above-mentioned heat exchange plates.

[0008] A third object of the present invention is to provide a heat exchange system having the above-mentioned plate heat exchanger.

[0009] In order to achieve the first object of the present invention, the present invention provides a heat exchange plate, which is provided with a plurality of first micro-element groups and a plurality of second micro-element groups, and the plurality of first micro-element groups and the plurality of second micro-element groups are alternately arranged in the length direction of the heat exchange plate, the first micro-element group includes a plurality of first protrusions and a plurality of first recesses, and the plurality of first protrusions and the plurality of first recesses are alternately arranged in the width direction of the heat exchange plate, the second micro-element group includes a plurality of second protrusions and a plurality of second recesses, and the plurality of second protrusions and the plurality of second recesses are alternately arranged in the width direction, and the first protrusions are arranged correspondingly to the second recesses in the length direction, and the second protrusions are arranged correspondingly to the first recesses in the length direction, and the first protrusions and the second protrusions are arranged correspondingly. The protrusion direction is the same, and the protrusion height of some / all of the multiple second protrusions is less than or equal to the protrusion height of the first protrusion. The first depression and the second depression have the same depression direction, and the depression height of some / all of the multiple second depressions is less than or equal to the depression height of the first depression. The protrusion direction of the first protrusion is opposite to the depression direction of the first depression in the height direction of the heat exchange plate. The first welding surface of the first protrusion away from the first depression has a first long side axis and a first short side axis that are perpendicular to each other. There is an inclination angle between the first long side axis and the length direction, and the multiple first long side axes gradually decrease from the first side to the second side in the width direction, and the sizes of the multiple first short side axes are consistent.

[0010] A preferred solution is that, in the width direction, a plurality of first long side axes are arranged in parallel; or, in the width direction, the extension directions of two adjacent first long side axes are arranged symmetrically about the first recess.

[0011] A further solution is that, among the multiple second protrusions in the width direction, the protrusion height of the second protrusion closest to the first side is equal to the protrusion height of the first protrusion, and the protrusion heights of the remaining multiple second protrusions are incrementally smaller than the protrusion height of the first protrusion in terms of the height difference from the first side toward the second side; and / or, among the multiple second depressions in the width direction, the depression height of the second depression closest to the second side is equal to the depression height of the first depression, and the depression heights of the remaining multiple second depressions are incrementally smaller than the depression height of the first depression in terms of the height difference from the second side toward the first side.

[0012] A further solution is that, among two adjacent second protrusions in the width direction, the protrusion height of one second protrusion is equal to the protrusion height of the first protrusion, and the protrusion height of the other second protrusion is smaller than the protrusion height of the first protrusion; and / or, among two adjacent second depressions in the width direction, the depression height of one second depression is equal to the depression height of the first depression, and the depression height of the other second depression is smaller than the depression height of the first depression.

[0013] A further solution is that the protrusion heights of all the second protrusions are equal to the protrusion heights of the first protrusions; and / or the depression heights of all the second depressions are equal to the depression heights of the first depressions.

[0014] A further solution is that the protrusion heights of all the second protrusions are smaller than the protrusion height of the first protrusions by a first height difference; and / or the recess heights of all the second recesses are smaller than the recess height of the first recesses by a second height difference.

[0015] A further solution is that the areas of the second welding surface of the second protrusion away from the second recess, the third welding surface of the first recess away from the first protrusion, and the fourth welding surface of the second recess away from the second protrusion are all smaller than the area of ​​the first welding surface.

[0016] A further solution is that the first welding surface is in a shape of an ellipse, a rounded rectangle, or a rounded rhombus.

[0017] In order to achieve the second object of the present invention, the present invention provides a plate heat exchanger, comprising at least three heat exchange plates, which are the above-mentioned heat exchange plates; multiple heat exchange plates are stacked in the height direction of the plate heat exchanger; among the three adjacent heat exchange plates, the first welding surface of the first heat exchange plate intersects with the first welding surface of the second heat exchange plate to form partial contact, and the second protrusion of the first heat exchange plate and the second protrusion of the second heat exchange plate are in full contact or have a first gap to form a first fluid channel; the first recess of the second heat exchange plate and the first recess of the third heat exchange plate are in full contact, and the second recess of the second heat exchange plate and the second recess of the third heat exchange plate are in full contact or have a second gap to form a second fluid channel.

[0018] In order to achieve the third object of the present invention, the present invention provides a heat exchange system, including a plate heat exchanger, and the plate heat exchanger is the plate heat exchanger mentioned above.

[0019] It can be seen from the above scheme that the multiple first micro-element groups and the multiple second micro-element groups of the heat exchange plate of the present invention are alternately arranged in the length direction of the heat exchange plate, the multiple first protrusions and the multiple first depressions of the first micro-element group are alternately arranged in the width direction of the heat exchange plate, the multiple second protrusions and the multiple second depressions of the second micro-element group are alternately arranged in the width direction of the heat exchange plate, the first protrusions of the first micro-element group are corresponding to the second depressions of the second micro-group in the length direction, and the second protrusions of the second micro-group are corresponding to the first depressions of the first micro-group in the length direction.

[0020] Moreover, the first welding surface of the first protrusion of the first microelement of the present invention, which is away from the first depression, has a first long side axis and a first short side axis which are perpendicular to each other, and an inclined angle is formed between the first long side axis and the length direction, so that the first long side axis of the first welding surface of the first protrusion is inclined relative to both the width direction and the length direction, and the multiple first long side axes gradually decrease from the first side toward the second side in the width direction, and the sizes of the multiple first short side axes are consistent. Therefore, the size of the first short side axis of the first welding surface of the first protrusion of the heat exchange plate of the present invention remains unchanged, and only the size of the first long side axis of the first welding surface of the first protrusion is changed, so that the local contact welding area formed by the intersection of the first welding surfaces of two adjacent heat exchange plates in the plate heat exchanger remains basically unchanged, thereby avoiding the welding area between the first welding surfaces of two adjacent heat exchange plates in the plate heat exchanger being too large or too small, and can effectively reduce the flow dead zone area to increase the effective heat exchange area. Simulation calculations have proved that the heat exchange capacity of the non-full contact welding form is significantly improved compared with the full contact welding form, and the heat exchange capacity can be increased by about 15% on average. At the same time, the non-full contact welding form can make the pressure loss smaller, and the first long side axis of the first welding surface of the heat exchange plate is inclined relative to the width direction and the length direction, so that the non-contact area formed by the intersection of the first welding surfaces of two adjacent heat exchange plates can disturb the fluid medium in multiple directions, thereby effectively enhancing the disturbance of the fluid medium. The invention can improve the uniformity of flow rate and flow and the heat exchange performance. Since the first long side axis of the multiple first protrusions of the heat exchange plate of the present invention gradually decreases from the first side toward the second side in the width direction, the first long side axis of the first side close to the flow port is longer, and the first long side axis of the second side away from the flow port is shorter. The longer first long side axis will compress the flow channel volume between the two adjacent fluid channels, and the shorter first long side axis will expand the flow channel volume between the two adjacent fluid channels, so that the flow channel volume gradually increases in the width direction as the first long side axis gradually decreases, so that in the width direction, the flow channel volume close to the flow port is smaller, and the flow channel volume away from the flow port is larger, so that the resistance of the fluid channel to the fluid medium gradually decreases from the first side toward the second side in the width direction. According to the flow law of the fluid, the fluid will be more inclined to flow to the position with smaller flow resistance, so that the flow rate and flow of the fluid medium in the fluid channel are evenly distributed in the width direction, further improving the uniformity of flow rate and flow, and improving the heat exchange performance.

[0021] Therefore, the size of the first short side axis of the first welding surface of the first protrusion of the heat exchange plate of the present invention remains unchanged, and only by changing the size of the first long side axis of the first welding surface of the first protrusion, the local contact welding area formed by the intersection of the first welding surfaces of two adjacent heat exchange plates in the plate heat exchanger remains basically unchanged, so that the multiple first long side axes gradually decrease from the first side toward the second side in the width direction, thereby changing the fluid channel resistance in different directions, and then changing the flow direction of the fluid medium. While achieving uniform distribution of flow rate and flow, it can effectively reduce the flow dead zone area to increase the effective heat exchange area, and can effectively enhance the disturbance ability of the fluid medium, further improve the uniformity of flow rate and flow, and improve the heat exchange performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a partial structural diagram of the first embodiment of the plate heat exchanger of the present invention.

[0023] Figure 2 It is a partial structural exploded view of the first embodiment of the plate heat exchanger of the present invention.

[0024] Figure 3 It is a partial front view of the first embodiment of the plate heat exchanger of the present invention.

[0025] Figure 4 yes Figure 3 Cross-sectional view at AA.

[0026] Figure 5 yes Figure 3 Cross-sectional view at BB.

[0027] Figure 6 It is a schematic diagram of the intersecting local contact between the first welding surfaces of two adjacent heat exchange plates in the first embodiment of the plate heat exchanger of the present invention.

[0028] Figure 7 It is a partial structural diagram of the heat exchange plates in the first embodiment of the plate heat exchanger of the present invention.

[0029] Figure 8 It is a partial front view of the heat exchange plate in the first embodiment of the plate heat exchanger of the present invention.

[0030] Figure 9 It is a partial structural diagram of the second embodiment of the plate heat exchanger of the present invention.

[0031] Figure 10 It is a partial structural exploded view of the second embodiment of the plate heat exchanger of the present invention.

[0032] Figure 11 It is a partial front view of the second embodiment of the plate heat exchanger of the present invention.

[0033] Figure 12 yes Figure 11 Cross-sectional view at CC.

[0034] Figure 13 It is a partial structural diagram of the heat exchange plates in the second embodiment of the plate heat exchanger of the present invention.

[0035] Figure 14 It is a partial front view of the heat exchange plate in the second embodiment of the plate heat exchanger of the present invention.

[0036] Figure 15 It is a partial front view of the third embodiment of the plate heat exchanger of the present invention.

[0037] Figure 16 yes Figure 15 Cross-sectional view at DD.

[0038] Figure 17 FIG. 4 is a cross-sectional view of a fourth embodiment of a plate heat exchanger according to the present invention in the width direction.

[0039] Figure 18 FIG. 4 is a cross-sectional view of a fifth embodiment of a plate heat exchanger according to the present invention in the width direction.

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0041] The first embodiment of the plate heat exchanger:

[0042] See also Figures 1 to 8 This embodiment discloses a plate heat exchanger 10 , comprising at least three heat exchange plates 11 , wherein the plurality of heat exchange plates 11 are stacked in a height direction Z of the plate heat exchanger 10 .

[0043] The heat exchange plate 11 of this embodiment is provided with a plurality of first micro-unit groups and a plurality of second micro-unit groups, which are alternately arranged in the longitudinal direction Y of the heat exchange plate 11. The first micro-unit groups of this embodiment include a plurality of first protrusions 111 and a plurality of first recesses 112, which are alternately arranged in the width direction X of the heat exchange plate 11. The second micro-unit groups of this embodiment include a plurality of second protrusions 113 and a plurality of second recesses 114, which are alternately arranged in the width direction X. The first protrusions 111 are arranged correspondingly to the second recesses 114 in the longitudinal direction Y, and the second protrusions 113 are arranged correspondingly to the first recesses 112 in the longitudinal direction Y.

[0044] In addition, in this embodiment, the first protrusion 111 and the second protrusion 113 have the same protrusion direction, and the protrusion height of some / all of the multiple second protrusions 113 is less than or equal to the protrusion height of the first protrusion 111, the first recess 112 and the second recess 114 have the same recess direction, and the recess height of some / all of the multiple second recesses 114 is less than or equal to the recess height of the first recess 112, the protrusion direction of the first protrusion 111 is opposite to the recess direction of the first recess 112 in the height direction Z of the heat exchange plate 11, the first welding surface 1111 of the first protrusion 111 away from the first recess 112 has a first long side axis 1112 and a first short side axis 1113 arranged perpendicular to each other, the first long side axis 1112 has an inclination angle θ with the length direction Y, and the multiple first long side axes 1112 gradually decrease from the first side to the second side in the width direction X, and the multiple first short side axes 1113 have the same size.

[0045] Specifically, in this embodiment, the multiple first long side axes 1112 are arranged parallel in the width direction X, and the protrusion heights of all the second protrusions 113 are equal to the protrusion heights of the first protrusions 111, and the recess heights of all the second recesses 114 are equal to the recess heights of the first recesses 112. Thus, in the plate heat exchanger 10 of this embodiment, among the three adjacent heat exchange plates 11, the first welded surface 1111 of the first heat exchange plate 11 intersects with the first welded surface 1111 of the second heat exchange plate 11 to form a local contact 14, and the second protrusions 113 of the first heat exchange plate 11 fully contact the second protrusions 113 of the second heat exchange plate 11, thereby forming the first fluid channel 12; the first recess 112 of the second heat exchange plate 11 fully contacts the first recess 112 of the third heat exchange plate 11, and the second recess 114 of the second heat exchange plate 11 fully contacts the second recess 114 of the third heat exchange plate 11, thereby forming the second fluid channel 13.

[0046] Furthermore, copper foil solder is placed at the local contact 14 formed by the intersection of the first welding surface 1111 of the first heat exchange plate 11 and the first welding surface 1111 of the second heat exchange plate 11. Copper foil solder is placed at all contact points between the second protrusion 113 of the first heat exchange plate 11 and the second protrusion 113 of the second heat exchange plate 11. Copper foil solder is placed at all contact points between the first recess 112 of the second heat exchange plate 11 and the first recess 112 of the third heat exchange plate 11. Copper foil solder is placed at all contact points between the second recess 114 of the second heat exchange plate 11 and the second recess 114 of the third heat exchange plate 11. The copper foil solder is melted at high temperature by vacuum brazing to form an integrated plate heat exchanger 10, thereby forming the first fluid channel 12 and the second fluid channel 13. The first fluid channel 12 is a heat exchange medium, such as a refrigerant, and the second fluid channel 13 is a heat exchange medium, such as water.

[0047] In this embodiment, the multiple first micro-element groups and the multiple second micro-element groups of the heat exchange plate 11 are alternately arranged in the longitudinal direction Y of the heat exchange plate 11, the multiple first protrusions 111 and the multiple first recesses 112 of the first micro-element group are alternately arranged in the width direction X of the heat exchange plate 11, and the multiple second protrusions 113 and the multiple second recesses 114 of the second micro-element group are alternately arranged in the width direction X of the heat exchange plate 11. The first protrusions 111 of the first micro-element group are corresponding to the second recesses 114 of the second micro-element group in the longitudinal direction Y, and the second protrusions 113 of the second micro-element group are corresponding to the first recesses 112 of the first micro-element group in the longitudinal direction Y. Moreover, the first welding surface 1111 of the first protrusion 111 of the first microelement of this embodiment, which is away from the first recess 112, has a first long side axis 1112 and a first short side axis 1113 which are perpendicular to each other, and an inclination angle θ is provided between the first long side axis 1112 and the length direction Y, so that the first long side axis 1112 of the first welding surface 1111 of the first protrusion 111 is inclined relative to both the width direction X and the length direction Y, and the multiple first long side axes 1112 gradually decrease from the first side toward the second side in the width direction X, and the multiple first short side axes 1113 have the same size.Therefore, the size of the first short side axis 1113 of the first welding surface 1111 of the first protrusion 111 of the heat exchange plate 11 of this embodiment remains unchanged, and only the size of the first long side axis 1112 of the first welding surface 1111 of the first protrusion 111 is changed, so that the local contact 14 welding area formed by the intersection of the first welding surfaces 1111 of two adjacent heat exchange plates 11 in the plate heat exchanger 10 remains basically unchanged, thereby avoiding the welding area between the first welding surfaces 1111 of two adjacent heat exchange plates 11 in the plate heat exchanger 10 from being too large or too small, and can effectively reduce flow deadlock. The area of ​​the zone is increased to improve the effective heat exchange area. After simulation calculation, it is proved that the heat exchange capacity of the non-complete contact welding form is significantly improved compared with the complete contact welding form. The heat exchange capacity can be increased by about 15% on average. At the same time, the non-complete contact welding form can make the pressure loss smaller. The first long side axis 1112 of the first welding surface 1111 of the heat exchange plate 11 is tilted relative to the width direction X and the length direction Y, so that the non-contact area 15 formed by the intersection of the first welding surfaces 1111 of the two adjacent heat exchange plates 11 can disturb the fluid medium in multiple directions, thereby effectively enhancing the The disturbance ability of the fluid medium is improved, the uniformity of the flow rate and the heat exchange performance are improved, and the first long side axis 1112 of the multiple first protrusions 111 of the heat exchange plate 11 of this embodiment gradually decreases from the first side to the second side in the width direction X, that is, A1>A2>A3..., so that in the width direction X, the first long side axis 1112 of the first side close to the flow port is longer, and the first long side axis 1112 of the second side away from the flow port is shorter. The longer first long side axis 1112 will compress the flow channel volume between two adjacent fluid channels, and the shorter first long side axis 1112 will expand the flow channel volume between two adjacent fluid channels. The flow channel volume between the channels, and thus the flow channel volume gradually increases in the width direction X as the first long side axis 1112 gradually decreases, so that in the width direction X, the flow channel volume close to the flow port is smaller, and the flow channel volume away from the flow port is larger, so that the resistance of the fluid channel to the fluid medium gradually decreases from the first side toward the second side in the width direction X. According to the flow law of the fluid, the fluid will be more inclined to flow to a position with smaller flow resistance, so that the flow velocity and flow of the fluid medium in the fluid channel in the width direction X are evenly distributed, further improving the uniformity of the flow velocity and flow, and improving the heat exchange performance.

[0048] Therefore, the size of the first short side axis 1113 of the first welding surface 1111 of the first protrusion 111 of the heat exchange plate 11 of this embodiment remains unchanged, and only the size of the first long side axis 1112 of the first welding surface 1111 of the first protrusion 111 is changed, so that the welding area of ​​the local contact 14 formed by the intersection of the first welding surfaces 1111 of two adjacent heat exchange plates 11 in the plate heat exchanger 10 remains basically unchanged, so that the multiple first long side axes 1112 gradually decrease from the first side to the second side in the width direction X, thereby changing the fluid channel resistance in different directions, and then changing the flow direction of the fluid medium, which can effectively reduce the flow dead zone area to increase the effective heat exchange area while achieving uniform distribution of flow rate and flow, and can effectively enhance the disturbance ability of the fluid medium, further improve the uniformity of flow rate and flow, and improve the heat exchange performance.

[0049] Combine Figure 8 In this embodiment, the areas of the second welding surface 1131 of the second protrusion 113 away from the second recess 114, the third welding surface 1121 of the first recess 112 away from the first protrusion 111, and the fourth welding surface 1141 of the second recess 114 away from the second protrusion 113 are all smaller than the area of ​​the first welding surface 1111 of the first protrusion 111. Specifically, in this embodiment, the first welding surface 1111 is one of an ellipse, a rounded rectangle, and a rounded rhombus.

[0050] To further enhance the multi-directional perturbation capability of the fluid medium and the uniformity of flow velocity and flow rate, the third welding surface 1121 of this embodiment has a second long axis and a second short axis arranged perpendicularly to each other, with the second long axis or the second short axis extending in the length direction Y. Furthermore, the fourth welding surface 1141 of this embodiment has a third long axis and a third short axis arranged perpendicularly to each other, with the third long axis or the third short axis extending in the width direction X. Specifically, the third welding surface 1121 and the fourth welding surface 1141 of this embodiment are shaped in one of the following: an ellipse, a rounded rectangle, or a rounded diamond. Alternatively, the third welding surface 1121 and the fourth welding surface 1141 of this embodiment may also be shaped in one of the following: a circle, a rounded square, or a rounded triangle. Furthermore, the second welding surface 1131 of the second protrusion 113 of this embodiment is shaped in one of the following: an ellipse, a rounded rectangle, a rounded diamond, a circle, a rounded square, or a rounded triangle.

[0051] In order to improve the flow smoothness and flow rate uniformity of the fluid medium, in this embodiment, the first protrusion 111 is connected to the two adjacent first recesses 112 and the two adjacent second recesses 114 by a smooth curved surface transition, the second protrusion 113 is connected to the two adjacent first recesses 112 and the two adjacent second recesses 114 by a smooth curved surface transition, and the second protrusion 113 is connected to the four adjacent first protrusions 111 by a smooth curved surface transition.

[0052] Second Embodiment of Plate Heat Exchanger:

[0053] As an illustration of the second embodiment of the plate heat exchanger of the present invention, only the differences from the first embodiment of the plate heat exchanger will be described below.

[0054] Refer to Figures 9 to 14 , in the plate heat exchanger 10' of this embodiment, in the width direction X of the heat exchange plates 11', the extending directions of two adjacent first long side axes 1112' are symmetrically arranged with respect to the first recess 112, that is, the extending directions of the first long side axes 1112' of two adjacent first protrusions 111' are symmetrically arranged with respect to the first recess 112, and it is maintained that the multiple first long side axes 1112' gradually decrease from the first side towards the second side in the width direction X, such that A1 > A2 > A3..., which can multiply the flow disturbance ability, thereby improving the uniform distribution of flow velocity and flow rate, and further multiplying the heat transfer performance.

[0055] Third Embodiment of Plate Heat Exchanger:

[0056] As an illustration of the third embodiment of the plate heat exchanger of the present invention, only the differences from the first embodiment of the plate heat exchanger will be described below.

[0057] Refer to Figure 15 and Figure 16 , among the multiple second protrusions 113 in the width direction X of the heat exchange plates 21 of this embodiment, the protrusion height of the second protrusion 213 closest to the first side is equal to the protrusion height of the first protrusion 211, and the height difference of the remaining multiple second protrusions 213 from the first side towards the second side increases less than the protrusion height of the first protrusion 211. Thus, in the plate heat exchanger of this embodiment between two adjacent heat exchange plates 21, the first welding surfaces 2111 of the first protrusions 211 of the two heat exchange plates 21 intersect to form a local contact 14, and there is a first gap G between the second welding surfaces 2131 of the second protrusions 213 of the two heat exchange plates 21, such that the second welding surfaces 2131 of the multiple second protrusions 213 form a "contact closest to the first side - non-contact with the first gap G gradually increasing closer to the second side" type change in the width direction X to form a first fluid passage 22. Since the two inlet and outlet flow ports connected to the first fluid passage 22 are arranged close to the first side of the heat exchange plates 21, the multiple first gaps G gradually increase from the first side towards the second side in the width direction X, that is, G1 < G2..., such that the resistance of the first gap G to the fluid medium gradually decreases from the first side towards the second side in the width direction X, thereby improving the flow velocity and flow rate uniformity, and the first gap G between the second protrusions 213 of the two heat exchange plates 21 can effectively disturb the fluid medium to enhance the flow disturbance ability, while ensuring the welding strength, and further improving the heat transfer performance.

[0058] Further, among the multiple second recesses 214 of the heat exchange plate 21 of this embodiment in the width direction X, the recess height of the second recess 214 closest to the second side is equal to the recess height of the first recess 212, and the height difference of the remaining multiple second recesses 214 from the second side towards the first side increases and is less than the recess height of the first recess 212. Thus, in the plate heat exchanger of this embodiment between its adjacent two heat exchange plates 21, the third welding surfaces 2121 of the first recesses 212 of the adjacent two heat exchange plates 21 are all in contact, and there is a second gap H between the fourth welding surfaces 2141 of the second recesses 214 of the two heat exchange plates 21, such that the fourth welding surfaces 2141 of the multiple second recesses 214 form a change of "contact closest to the second side - non-contact with the second gap H gradually increasing towards the first side" in the width direction X to form the second fluid passage 23. Since the two inlet and outlet flow ports of the second fluid passage 23 are arranged close to the second side of the heat exchange plate 21, the multiple second gaps H gradually increase from the second side towards the first side in the width direction X, that is, H1 < H2..., so that the resistance of the second gap H to the fluid medium gradually decreases from the second side towards the first side in the width direction X, thereby improving the flow velocity and flow rate uniformity, and there is a second gap H between the second recesses 214 of the two heat exchange plates 21, which can effectively disturb the fluid medium to enhance the turbulence ability, while ensuring the welding strength, and further improving the heat exchange performance.

[0059] Fourth embodiment of the plate heat exchanger:

[0060] As an illustration of the fourth embodiment of the plate heat exchanger of the present invention, the following only illustrates the differences from the first embodiment of the plate heat exchanger.

[0061] See Figure 17 , the protrusion height of all the second protrusions 313 of the heat exchange plate 31 of this embodiment is less than the protrusion height of the first protrusion 311 with a first height difference. Thus, in the plate heat exchanger of this embodiment between its adjacent two heat exchange plates 31, the first welding surfaces 3111 of the first protrusions 311 of the two heat exchange plates 31 intersect to form a partial contact 14, and there is a first gap G3 between the second protrusions 313 of the two heat exchange plates 31, such that the second welding surfaces 3131 of the multiple second protrusions 313 are arranged in a "non-contact" manner in the width direction X to form the first fluid passage 32. There is a first gap G3 between the second protrusions 313 of the two heat exchange plates 31, which can effectively disturb the fluid medium to enhance the turbulence ability, while ensuring the welding strength, can improve the flow velocity and flow rate uniformity, and further improve the heat exchange performance.

[0062] Furthermore, the recess heights of all the second recesses 314 of the heat exchange plates 31 of this embodiment are smaller than the recess height of the first recess 312 by a second height difference, so that in the plate heat exchanger of this embodiment, in two adjacent heat exchange plates 31, the third welding surfaces 3121 of the first recesses 312 of the two heat exchange plates 31 are all in contact, and a second gap H3 is provided between the fourth welding surfaces 3141 of the second recesses 314 of the two heat exchange plates 31, so that the multiple second recesses 314 form a "non-contact" arrangement in the width direction X to form a second fluid channel 33. The second gap H3 between the second recesses 314 of the two heat exchange plates 31 can effectively disturb the fluid medium to enhance the flow disturbance capability, thereby improving the flow rate uniformity while ensuring the welding strength, thereby improving the heat exchange performance.

[0063] The fifth embodiment of the plate heat exchanger:

[0064] As an explanation of the fourth embodiment of the plate heat exchanger of the present invention, only the differences from the first embodiment of the plate heat exchanger are described below.

[0065] See also Figure 18 In this embodiment, among the two adjacent second protrusions 413 of the heat exchange plate 41 in the width direction X, the protrusion height of one second protrusion 413 is equal to the protrusion height of the first protrusion 411, and the protrusion height of the other second protrusion 413 is less than the protrusion height of the first protrusion 411. Therefore, in the plate heat exchanger of this embodiment, in the two adjacent heat exchange plates 41, the first welding surfaces 4111 of the first protrusions 411 of the two heat exchange plates 41 intersect to form a local contact 14, and the second welding surfaces 4111 of a portion of the second protrusions 413 of the two heat exchange plates 41 are The surfaces 4131 are all in contact with each other, and a first gap G4 is provided between the second welding surfaces 4131 of another part of the second protrusions 413, so that the multiple second protrusions 413 form a "contact-non-contact" alternating change form in the width direction X to form a first fluid channel 42. The first gap G4 between the second protrusions 413 of the two heat exchange plates 41 can effectively disturb the fluid medium to enhance the flow disturbance capability, while ensuring the welding strength, it can improve the uniformity of the flow rate and flow, thereby improving the heat exchange performance.

[0066] Furthermore, the recess heights of all the second recesses 414 of the heat exchange plates 41 of this embodiment are smaller than the recess height of the first recess 412 by a third height difference, so that in the plate heat exchanger of this embodiment, in two adjacent heat exchange plates 41, the third welding surfaces 4121 of the first recesses 412 of the two heat exchange plates 41 are all in contact, and a second gap H4 is provided between the fourth welding surfaces 4141 of the second recesses 414 of the two heat exchange plates 41, so that the fourth welding surfaces 4141 of the multiple second recesses 414 form a "non-contact" arrangement in the width direction X to form a second fluid channel 43. The second gap H4 between the fourth welding surfaces 4141 of the second recesses 414 of the two heat exchange plates 41 can effectively disturb the fluid medium to enhance the flow disturbance capability, thereby improving the flow rate uniformity while ensuring the welding strength, and thus improving the heat exchange performance.

[0067] Alternatively, in the two adjacent second recesses 414 of the heat exchange plate 41 in the width direction X of this embodiment, the recess height of one second recess 414 is equal to the recess height of the first recess 412, and the recess height of the other second recess 414 is smaller than the recess height of the first recess 412. Thus, in the plate heat exchanger of this embodiment, in the two adjacent heat exchange plates 41, the third welding surfaces 4121 of the first recesses 412 of the two heat exchange plates 41 are completely in contact, and the fourth welding surfaces 4141 of a portion of the second recesses 414 of the two heat exchange plates 41 are completely in contact. There is a second gap H4 between the fourth welding surfaces 4141 of another part of the second recesses 414, so that the fourth welding surfaces 4141 of multiple second recesses 414 form a "contact-non-contact" alternating change form in the width direction X to form a second fluid channel 43. The second gap H4 between the fourth welding surfaces 4141 of the second recesses 414 of the two heat exchange plates 41 can effectively disturb the fluid medium to enhance the flow disturbance ability. While ensuring the welding strength, it can improve the uniformity of the flow rate and flow, thereby improving the heat exchange performance.

[0068] The above embodiments are only preferred examples of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles of the patent application scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A heat exchange plate, comprising a plurality of first micro-element groups and a plurality of second micro-element groups, wherein the plurality of first micro-element groups and the plurality of second micro-element groups are alternately arranged along the length of the heat exchange plate, characterized in that: The first micro-element group includes a plurality of first protrusions and a plurality of first recesses, and the plurality of first protrusions and the plurality of first recesses are alternately arranged in the width direction of the heat exchange plate; the second micro-element group includes a plurality of second protrusions and a plurality of second recesses, and the plurality of second protrusions and the plurality of second recesses are alternately arranged in the width direction, and the first protrusions are correspondingly arranged in the length direction, and the second protrusions are correspondingly arranged in the length direction; The first protrusion and the second protrusion have the same protrusion direction, and the protrusion height of some / all of the multiple second protrusions is less than or equal to the protrusion height of the first protrusion. The first recess and the second recess have the same recess direction, and the recess height of some / all of the multiple second recesses is less than or equal to the recess height of the first recess. The protrusion direction of the first protrusion is opposite to the recess direction of the first recess in the height direction of the heat exchange plate. The first welding surface of the first protrusion away from the first recess has a first long side axis and a first short side axis that are perpendicular to each other. The first long side axis has an inclination angle with the length direction, and the multiple first long side axes gradually decrease from the first side to the second side in the width direction, and the sizes of the multiple first short side axes are consistent.

2. The heat exchange plate according to claim 1, characterized in that: In the width direction, a plurality of the first long side axes are arranged in parallel; Alternatively, in the width direction, the extension directions of two adjacent first long side axes are symmetrically arranged about the first recess.

3. The heat exchange plate according to claim 1, characterized in that: Among the plurality of second protrusions in the width direction, the protrusion height of the second protrusion closest to the first side is equal to the protrusion height of the first protrusion, and the protrusion heights of the remaining plurality of second protrusions are progressively smaller than the protrusion height of the first protrusion from the first side toward the second side; And / or, among the multiple second recesses in the width direction, the recess height of the second recess closest to the second side is equal to the recess height of the first recess, and the recess heights of the remaining multiple second recesses are increasingly smaller than the recess height of the first recess from the second side toward the first side.

4. The heat exchange plate according to claim 1, characterized in that: Of two adjacent second protrusions in the width direction, a protrusion height of one second protrusion is equal to a protrusion height of the first protrusion, and a protrusion height of the other second protrusion is smaller than a protrusion height of the first protrusion; And / or, in two adjacent second recesses in the width direction, the recess height of one second recess is equal to the recess height of the first recess, and the recess height of the other second recess is smaller than the recess height of the first recess.

5. The heat exchange plate according to claim 1, characterized in that: The protrusion heights of all the second protrusions are equal to the protrusion height of the first protrusions; And / or, the recess heights of all the second recesses are equal to the recess height of the first recesses.

6. The heat exchange plate according to claim 1, characterized in that: The protrusion heights of all the second protrusions are smaller than the protrusion height of the first protrusions by a first height difference; And / or, the recess heights of all the second recesses are smaller than the recess height of the first recesses by a second height difference.

7. The heat exchange plate according to claim 1, characterized in that: The areas of the second welding surface of the second protrusion away from the second recess, the third welding surface of the first recess away from the first protrusion, and the fourth welding surface of the second recess away from the second protrusion are all smaller than the area of ​​the first welding surface.

8. The heat exchange plate according to any one of claims 1 to 7, characterized in that: The first welding surface is in a shape of an ellipse, a rounded rectangle, or a rounded rhombus.

9. A plate heat exchanger comprising at least three heat exchange plates, characterized in that: The heat exchange plate is the heat exchange plate according to any one of claims 1 to 8; The plurality of heat exchange plates are stacked in the height direction of the plate heat exchanger; Among the three adjacent heat exchange plates, the first welding surface of the first heat exchange plate intersects with the first welding surface of the second heat exchange plate to form partial contact, and the second protrusion of the first heat exchange plate and the second protrusion of the second heat exchange plate are fully in contact or have a first gap to form a first fluid channel; The first recess of the second heat exchange plate is in full contact with the first recess of the third heat exchange plate, and the second recess of the second heat exchange plate is in full contact with the second recess of the third heat exchange plate or has a second gap therebetween to form a second fluid channel.

10. A heat exchange system including a plate heat exchanger, characterized in that: The plate heat exchanger is the plate heat exchanger according to claim 9.

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