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. The first micro-element group of the heat exchange plate has multiple first protrusions and multiple first depressions arranged alternately in the width direction, the second micro-element group has multiple second protrusions and multiple second depressions arranged alternately in the width direction, the first protrusions are arranged correspondingly to the second depressions in the length direction, and the second protrusions are arranged correspondingly to the first depressions in the length direction. The first welding surface of the first protrusion has a first long side axis and a first short side axis, and there is a first inclination angle between the first long side axis and the length direction. The multiple first inclination angles of the same first micro-element group gradually decrease from one side to the other side in the width direction, and the first inclination angle is an acute angle. The heat exchange plate of the present invention can achieve uniform flow velocity distribution while effectively reducing the flow dead zone area to increase the effective heat exchange area, and can effectively enhance the multi-directional disturbance capability of the fluid medium, further improve the flow velocity uniformity, and improve the 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 high, while the flow velocity of the fluid medium far from the circulation port in the fluid channel is relatively low. This leads to uneven distribution of the flow velocity of the fluid medium in the fluid channel, resulting 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, stagnation will form locally, and freezing and cracking are likely to occur under low temperature conditions, leading to failure or paralysis of the heat exchange system.

[0004] In order to achieve uniform flow rate distribution, the heat exchange plates of the existing plate heat exchanger are designed 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 varying the width of the welded surface of the convex and concave portions excessively increases the size of the welded surface, resulting in an increase in the dead zone between the welded surfaces of the convex and concave portions of two adjacent heat exchange plates after welding. This increases ineffective resistance and reduces the effective heat exchange area of ​​the heat exchange plates. Furthermore, the existing method of varying the width of the welded surface of the convex and concave portions results in poor disturbance of the fluid medium by the convex and concave portions, which in turn affects the heat exchange effect and 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 flow velocity distribution, and can effectively enhance the multi-directional disturbance capability of the fluid medium, further improve the flow velocity uniformity, 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, 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, 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, the plurality of second protrusions and the plurality of second recesses are alternately arranged in the width direction, and the first protrusions are corresponding to the second recesses in the length direction, and the second protrusions are arranged in correspondence with the second recesses in the length direction. The protrusion is arranged corresponding to the first depression in the length direction, the protrusion direction and the protrusion height of the first protrusion and the second protrusion are the same, the depression direction and the depression height of the first depression are the same, and 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 which are perpendicular to each other, and a first inclination angle is formed between the first long side axis and the length direction, and the multiple first inclination angles of the same first microelement group gradually decrease from one side to the other side in the width direction, and the first inclination angle is an acute angle.

[0010] A preferred solution is that the second welding surface of the first depression away from the first protrusion has a different shape from the first welding surface; and / or the third welding surface of the second depression away from the second protrusion has a different shape from the fourth welding surface of the second protrusion away from the second depression.

[0011] A further solution is that the second welding surface has a second long side axis and a second short side axis arranged perpendicular to each other, and the second long side axis or the second short side axis extends in the length direction; and / or, the third welding surface has a third long side axis and a third short side axis arranged perpendicular to each other, and the third long side axis or the third short side axis extends in the width direction.

[0012] A further solution is that the second welding surface is in a shape of an ellipse, a rounded rectangle, or a rounded rhombus; and / or the third welding surface is in a shape of an ellipse, a rounded rectangle, or a rounded rhombus; and / or the fourth welding surface is in a shape of a square, a circle, or an ellipse.

[0013] A further solution is that the first welding surface is in a shape of an ellipse, a rounded rectangle, or a rounded rhombus.

[0014] A further solution is that the first protrusion is smoothly connected to two adjacent first recesses and two adjacent second recesses, the second protrusion is smoothly connected to two adjacent first recesses and two adjacent second recesses, and the second protrusion is smoothly connected to four adjacent first protrusions.

[0015] A further solution is that the first microelement group also includes multiple third protrusions and multiple third recesses, a first protrusion, a first recess, a third protrusion and a third recess are arranged in sequence in the width direction to form a microelement unit, multiple microelement units are arranged in the width direction, two adjacent second protrusions in the width direction are respectively arranged corresponding to the first recess and the third recess in the length direction, two adjacent second recesses in the width direction are respectively arranged corresponding to the first protrusion and the third protrusion in the length direction, the protrusion direction and protrusion height of the third protrusion are the same as those of the first protrusion, the recess direction and recess height of the third recess are the same as those of the first recess, the fifth welding surface of the third protrusion away from the third recess has a fifth long side axis and a fifth short side axis arranged perpendicular to each other, the fifth long side axis has a second inclination angle with the length direction, the second inclination angle is an obtuse angle, and multiple fifth welding surfaces are arranged in parallel in the width direction.

[0016] A further solution is that the fifth welding surface has the same shape and area as the first welding surface; and / or, the sixth welding surface where the third depression is away from the third protrusion has a different shape from the fifth welding surface; and / or, the sixth welding surface where the third depression is away from the third protrusion has the same shape and arrangement direction as the second welding surface where the first depression is away from the first protrusion.

[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, wherein the heat exchange plates are the above-mentioned heat exchange plates;

[0018] A plurality of heat exchange plates are stacked in the height direction of the plate heat exchanger. Among 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 is in full contact with the second protrusion of the second heat exchange plate 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 to form a second fluid channel;

[0019] Alternatively, multiple heat exchange plates are stacked in the height direction of the plate heat exchanger, and among the three adjacent heat exchange plates, the first welding surface of the first heat exchange plate is in full contact with the first welding surface of the second heat exchange plate, and the second protrusion of the first heat exchange plate is in full contact with the second protrusion of the second heat exchange plate 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 to form a second fluid channel.

[0020] 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.

[0021] 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, the first protrusions of the first micro-element group are arranged correspondingly to the second depressions of the second micro-element group in the length direction, and the second protrusions of the second micro-group are arranged correspondingly to the first depressions of the first micro-group in the length direction, and the first welding surface of the first protrusion away from the first depression of the present invention has a first long side axis and a first short side axis which are perpendicular to each other, and there is a first inclination angle between the first long side axis of the first welding surface and the length direction, and the multiple first inclination angles of the same first micro-element group gradually decrease from one side to the other side in the width direction, and the first inclination angle is an acute angle. Therefore, the size of the first welding surface of the first protrusion of the heat exchange plate of the present invention remains unchanged, and the first inclination angle between the first long side axis of the first welding surface of the first protrusion and the length direction is changed, that is, the multiple first inclination angles of the same first micro-element gradually decrease from one side to the other side in the width direction, so that in the width direction, the first inclination angle close to the flow port is larger, and the first inclination angle away from the flow port is smaller, thereby changing the fluid channel width to gradually increase from one side to the other side in the width direction, so that the fluid channel volume gradually increases in the width direction as the first inclination angle gradually decreases, so that in the width direction, the fluid channel volume close to the flow port is smaller, and the fluid channel volume away from the flow port is larger, so that the resistance of the fluid channel to the fluid medium gradually decreases from one side to the other side in the width direction. 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 of the fluid medium in the fluid channel is evenly distributed in the width direction.

[0022] In addition, the first long side axis of the first welding surface of the first protrusion of the heat exchange plate of the present invention is inclined relative to the length direction. The inclined first welding surface of the first protrusion can disturb the circumferential multi-directional fluid medium, and the second protrusion and the second depression can also disturb the fluid medium, thereby further improving the flow velocity uniformity of the fluid medium in the width direction and the length direction.

[0023] In addition, the first welding surfaces of two adjacent heat exchange plates of the plate heat exchanger of the present invention can be fully contacted and welded. Since the size of the first welding surface of the heat exchange plate of the present invention remains unchanged, the first inclination angle between the first long side axis and the length direction of the first welding surface is changed to achieve the purpose of uniform flow velocity distribution, so that the area of ​​the first welding surfaces that are fully contacted will not be excessively increased, thereby effectively reducing the flow dead zone area, thereby increasing the effective heat exchange area, and further improving the heat exchange performance.

[0024] In addition, the first welding surfaces of two adjacent heat exchange plates of the plate heat exchanger of the present invention can be intersected and contact welded, thereby forming local contact welding, which can greatly reduce the flow dead zone area and further increase the effective heat exchange area. Simulation calculations have proved that the heat exchange capacity of the non-complete contact welding form is further improved by about 15% based on the complete contact welding form. At the same time, the non-complete contact welding form can make the pressure loss smaller, and the non-contact area between the first welding surfaces of the two adjacent heat exchange plates can disturb the fluid medium in multiple directions, thereby further improving the flow velocity uniformity of the fluid medium in the width direction and the length direction.

[0025] Therefore, the heat exchange plate of the present invention does not change the area of ​​the first welding surface of the first protrusion, but changes the first inclination angle between the first long side axis of the first welding surface of the first protrusion and the length direction, so that the multiple first inclination angles of the same first micro-element group gradually decrease from one side to the other 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 velocity, it can effectively reduce the flow dead zone area to increase the effective heat exchange area, and can effectively enhance the multi-directional disturbance capability of the fluid medium, further improve the flow velocity uniformity, and improve the heat exchange performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a first partial structural diagram of the first embodiment of the plate heat exchanger of the present invention.

[0027] Figure 2 It is a partial structural exploded view of the first embodiment of the plate heat exchanger of the present invention.

[0028] Figure 3 It is a first partial front view of the first embodiment of the plate heat exchanger of the present invention.

[0029] Figure 4 yes Figure 3 Cross-sectional view at AA.

[0030] Figure 5 It is a second partial front view of the first embodiment of the plate heat exchanger of the present invention.

[0031] Figure 6 yes Figure 5 Cross-sectional view at BB.

[0032] Figure 7 It is a partial contact diagram of the first embodiment of the plate heat exchanger of the present invention.

[0033] Figure 8 It is a second partial structural diagram of the first embodiment of the plate heat exchanger of the present invention.

[0034] Figure 9 It is a partial structural diagram of the heat exchange plates in the first embodiment of the plate heat exchanger of the present invention.

[0035] Figure 10 It is a first partial front view of the heat exchange plate in the first embodiment of the plate heat exchanger of the present invention.

[0036] Figure 11 It is a second partial front view of the heat exchange plate in the first embodiment of the plate heat exchanger of the present invention.

[0037] Figure 12 It is a partial front view of the heat exchange plate in the second embodiment of the plate heat exchanger of the present invention.

[0038] Figure 13 It is a partial front view of the heat exchange plates in the third embodiment of the plate heat exchanger of the present invention.

[0039] Figure 14 It is a partial front view of the heat exchange plates in the fourth embodiment of the plate heat exchanger of the present invention.

[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 11 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] In this embodiment, the heat exchange plate 11 is provided with a plurality of first micro-element groups and a plurality of second micro-element groups, which are alternately arranged in the longitudinal direction Y of the heat exchange plate 11. The first micro-element group includes 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-element group includes 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] Moreover, in this embodiment, the protrusion direction and protrusion height of the first protrusion 111 and the second protrusion 113 are the same, the recess direction and recess height of the first recess 112 and the second recess 114 are the same, and 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, and the first welding surface 1111 of the first protrusion 111 away from the first recess 112 has a first long side axis 11111 and a first short side axis 11112 arranged perpendicular to each other, and a first inclination angle θ is formed between the first long side axis 11111 and the length direction Y, and the multiple first inclination angles θ of the same first microelement gradually decrease from one side to the other side in the width direction X, and the first inclination angle θ is an acute angle.

[0045] When the plate heat exchanger 10 of this embodiment has three adjacent heat exchange plates 11, the first welding surface 1111 of the first heat exchange plate 11 intersects with the first welding surface 1111 of the second heat exchange plate 11 to form a local contact 14, and the second protrusion 113 of the first heat exchange plate 11 is in full contact with the second protrusion 113 of the second heat exchange plate 11 to form a first fluid channel 12; the first recess 112 of the second heat exchange plate 11 is in full contact with the first recess 112 of the third heat exchange plate 11, and the second recess 114 of the second heat exchange plate 11 is in full contact with the second recess 114 of the third heat exchange plate 11 to form a second fluid channel 13.

[0046] When the plate heat exchanger 10 of this embodiment has three adjacent heat exchange plates 11, the first welding surface 1111 of the first heat exchange plate 11 is completely in contact with the first welding surface 1111 of the second heat exchange plate 11, and the second protrusion 113 of the first heat exchange plate 11 is completely in contact with the second protrusion 113 of the second heat exchange plate 11, so as to form a first fluid channel 12; the first recess 112 of the second heat exchange plate 11 is completely in contact with the first recess 112 of the third heat exchange plate 11, and the second recess 114 of the second heat exchange plate 11 is completely in contact with the second recess 114 of the third heat exchange plate 11, so as to form a second fluid channel 13.

[0047] Specifically, copper foil solder is placed at the partial contact 14 or all contact areas between 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 areas 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 areas between the first recess 112 of the second heat exchange plate 11 and the first recess 112 of the third heat exchange plate 11, and copper foil solder is placed at all contact areas 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.

[0048] In this embodiment, multiple first micro groups and multiple second micro groups of the heat exchange plate 11 are arranged alternately in the length direction Y of the heat exchange plate 11. Multiple first protrusions 111 and multiple first depressions 112 of the first micro group are arranged alternately in the width direction X of the heat exchange plate 11. Multiple second protrusions 113 and multiple second depressions 114 of the second micro group are arranged alternately in the width direction X. The first protrusion 111 of the first micro group is correspondingly arranged with the second depression 114 of the second micro group in the length direction Y. The second protrusion 113 of the second micro group is correspondingly arranged with the first depression 112 of the first micro group in the length direction Y. Moreover, the first welding surface 1111 of the first protrusion 111 of the first micro group in this embodiment, which is far from the first depression 112, has a first long side axis 11111 and a first short side axis 11112 that are perpendicularly arranged. There is a first inclination angle θ between the first long side axis 11111 of the first welding surface 1111 and the length direction Y. Multiple first inclination angles θ of the same first micro group gradually decrease from one side to the other side in the width direction X, and the first inclination angle θ is an acute angle. Thus, the size of the first welding surface 1111 of the first protrusion 111 of the heat exchange plate 11 in this embodiment remains unchanged. By changing the first inclination angle θ between the first long side axis 11111 of the first welding surface 1111 of the first protrusion 111 and the length direction Y, that is, multiple first inclination angles θ of the same first micro group gradually decrease from one side to the other side in the width direction X, such that θ1>θ2>θ3……, so that in the width direction X, the first inclination angle θ near the flow port is larger, and the first inclination angle θ far from the flow port is smaller, thereby changing the fluid channel width d to gradually increase from one side to the other side in the width direction X, that is, d1<d2……. Therefore, the fluid channel volume gradually increases with the gradual decrease of the first inclination angle θ in the width direction X, making the fluid channel volume near the flow port smaller and the fluid channel volume far from the flow port larger in the width direction X. Thus, the resistance of the fluid channel to the fluid medium gradually decreases from one side to the other side in the width direction X. According to the flow law of the fluid, the fluid will be more inclined to flow to the position with less flow resistance, so that the flow velocity of the fluid medium in the fluid channel is evenly distributed in the width direction X.

[0049] Moreover, the first long side axis 11111 of the first welding surface 1111 of the first protrusion 111 of the heat exchange plate 11 in this embodiment is inclined relative to the length direction Y. The first welding surface 1111 of the inclined first protrusion 111 can disturb the fluid medium in multiple directions in the circumferential direction, and the second protrusion 113 and the second depression 114 can also disturb the fluid medium, thereby further improving the flow velocity uniformity of the fluid medium in the width direction X and the length direction Y.

[0050] In addition, the first welding surfaces 1111 of two adjacent heat exchange plates 11 of the plate heat exchanger 10 of the present invention can be fully contacted and welded. Since the size of the first welding surfaces 1111 of the heat exchange plates 11 of the present invention remains unchanged, the first inclination angle θ between the first long side axis 11111 and the length direction Y of the first welding surface 1111 is changed to achieve the purpose of uniform flow velocity distribution, so that the area of ​​the first welding surfaces 1111 that are fully contacted will not be excessively increased, thereby effectively reducing the flow dead zone area, thereby increasing the effective heat exchange area, and further improving the heat exchange performance.

[0051] In addition, the first welding surfaces 1111 of the two adjacent heat exchange plates 11 of the plate heat exchanger 10 of this embodiment can be intersected and contact welded, thereby forming a local contact 14 weld, which can greatly reduce the flow dead zone area and further increase the effective heat exchange area. Simulation calculations have shown that the heat exchange capacity of the non-complete contact welding form is further improved by about 15% based on the complete contact welding form. At the same time, the non-complete contact welding form can make the pressure loss smaller, and the non-contact area 15 between the first welding surfaces 1111 of the two adjacent heat exchange plates 11 can disturb the fluid medium in multiple directions, thereby further improving the flow velocity uniformity of the fluid medium in the width direction X and the length direction Y.

[0052] Therefore, the heat exchange plate 11 of this embodiment does not change the area of ​​the first welding surface 1111 of the first protrusion 111, and by changing the first inclination angle θ between the first long side axis 11111 of the first welding surface 1111 of the first protrusion 111 and the length direction Y, multiple first inclination angles θ of the same first micro-element group gradually decrease from one side to the other 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. While achieving uniform distribution of flow velocity, it is possible to effectively reduce the flow dead zone area to increase the effective heat exchange area, and can effectively enhance the multi-directional disturbance capability of the fluid medium, further improve the flow velocity uniformity, and improve the heat exchange performance.

[0053] Combine Figure 10 In this embodiment, the second welding surface 1121 of the first recess 112 away from the first protrusion 111 has a different shape from the first welding surface 1111 of the first protrusion 111, and the third welding surface 1141 of the second recess 114 away from the second protrusion 113 has a different shape from the fourth welding surface 1131 of the second protrusion 113 away from the second recess 114.

[0054] To further enhance the multi-directional perturbation capability and flow rate uniformity of the fluid medium, the second 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 third 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. Furthermore, the third long axis of the third welding surface 1141 of the second recess 114 of this embodiment is perpendicularly arranged to the second long axis of the second welding surface 1121 of the first recess 112, further enhancing the multi-directional perturbation capability and flow rate uniformity of the fluid medium.

[0055] Specifically, the first welding surface 1111 of this embodiment is an ellipse, the second welding surface 1121 of this embodiment is a rounded rhombus, the third welding surface 1141 of this embodiment is a rounded rhombus, and the fourth welding surface 1131 of this embodiment is a square.

[0056] In order to improve the flow smoothness and flow rate uniformity of the fluid medium, in this embodiment, the first protrusion 111 is smoothly transitioned to the two adjacent first recesses 112 and the two adjacent second recesses 114, the second protrusion 113 is smoothly transitioned to the two adjacent first recesses 112 and the two adjacent second recesses 114, and the second protrusion 113 is smoothly transitioned to the four adjacent first protrusions 111.

[0057] The second embodiment of the plate heat exchanger:

[0058] As an explanation 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 are described below.

[0059] See also Figure 12In this embodiment, the first welding surface 1111' of the first protrusion 111 of the heat exchange plate 11 is a rounded rectangle, then the first long side axis 11111' of the first welding surface 1111' is the long side direction of the rounded rectangle first welding surface 1111', and the first short side axis 11112' of the first welding surface 1111' is the short side direction of the rounded rectangle first welding surface 1111'. In addition, the second welding surface 1121' of the first recess 112 of the heat exchange plate 11 is a rounded rectangle, then the second long side axis of the second welding surface 1121' is the long side direction of the rounded rectangle second welding surface 1121', and the first short side axis 11112' of the second welding surface 1121' is the short side direction of the rounded rectangle first welding surface 1121'. The second short side axis is the short side direction of the second welding surface 1121' of the rounded rectangle, and the third welding surface 1141' of the second recess 114 of the heat exchange plate 11 of this embodiment is a rounded rectangle, then the third long side axis of the third welding surface 1141' is the long side direction of the third welding surface 1141' of the rounded rectangle, and the third short side axis of the third welding surface 1141' is the short side direction of the third welding surface 1141' of the rounded rectangle. At the same time, the fourth welding surface 1131' of the second protrusion 113 of the heat exchange plate 11 of this embodiment is circular, so that the flow velocity distribution of the fluid medium in different areas of the fluid channel is uniform, thereby enhancing the heat exchange performance.

[0060] The third embodiment of the plate heat exchanger:

[0061] As an explanation 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 are described below.

[0062] See also Figure 13 In this embodiment, the first welding surface 1111" of the first protrusion 111 of the heat exchange plate 11 is a rounded rhombus, and the second welding surface 1121" of the first recess 112 of the heat exchange plate 11 is a rounded rhombus, and the third welding surface 1141" of the second recess 114 of the heat exchange plate 11 is a rounded rhombus. At the same time, the fourth welding surface 1131" of the second protrusion 113 of the heat exchange plate 11 is an elliptical shape, so that the flow velocity distribution of the fluid medium in different areas of the fluid channel is uniform, thereby enhancing the heat exchange performance.

[0063] Alternatively, the second welding surface 1121 ″ of the first recess 112 of the heat exchange plate 11 may be elliptical, and the third welding surface 1141 ″ of the second recess 114 of the heat exchange plate 11 may be elliptical.

[0064] The fourth embodiment of the plate heat exchanger:

[0065] 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.

[0066] See also Figure 14In this embodiment, the first micro-element group of the heat exchange plate 11 further includes a plurality of third protrusions 115 and a plurality of third recesses 116. A first protrusion 111, a first recess 112, a third protrusion 115, and a third recess 116 are sequentially arranged in the width direction X to form a micro-element unit. The plurality of micro-element units are arranged in the width direction X. Two adjacent second protrusions 113 in the width direction X are respectively arranged corresponding to the first recess 112 and the third recess 116 in the length direction Y. Two adjacent second recesses 114 in the width direction X are respectively arranged corresponding to the first protrusion 111 and the third protrusion 115 in the length direction Y. Moreover, in this embodiment, the protrusion direction and protrusion height of the third protrusion 115 are the same as those of the first protrusion 111, the depression direction and depression height of the third depression 116 are the same as those of the first depression 112, and the fifth welding surface 1151 of the third protrusion 115 away from the third depression 116 has a fifth long side axis 11511 and a fifth short side axis arranged perpendicular to each other, and there is a second inclination angle β between the fifth long side axis 11511 and the length direction Y, the second inclination angle β is an obtuse angle, and multiple fifth welding surfaces 1151 are arranged in parallel in the width direction X.

[0067] In this embodiment, the heat exchange plate 11 uses a first protrusion 111, a first recess 112, a third protrusion 115 and a third recess 116 arranged in sequence in the width direction X to form a microelement unit. At the same time, the fifth welding surface 1151 of the third protrusion 115 away from the third recess 116 has a fifth long side axis 11511 and a fifth short side axis arranged perpendicular to each other, and a second inclination angle β is formed between the fifth long side axis 11511 and the length direction Y. The second inclination angle β is an obtuse angle, and multiple fifth welding surfaces 1151 are arranged in parallel in the width direction X. Thus, the first welding surfaces 1111 of the first protrusions 111 of two adjacent heat exchange plates 11 of the plate heat exchanger 10 of this embodiment intersect and contact, thereby forming a first local contact 14. At the same time, the fifth welding surfaces 1151 of the third protrusions 115 of two adjacent heat exchange plates 11 of the plate heat exchanger 10 of this embodiment intersect and contact, thereby forming a second local contact, and the inclination direction of the first long side axis 11111 of the first welding surface 1111 of the first protrusion 111 is opposite to the inclination direction of the fifth long side axis 11511 of the fifth welding surface 1151 of the third protrusion 115, which can multiply the flow disturbance capability, thereby improving the uniform distribution of flow velocity, and further multiplying the heat exchange performance.

[0068] Specifically, the fifth welding surface 1151 of the third protrusion 115 of this embodiment is the same in shape and area as the first welding surface 1111 of the first protrusion 111, and the sixth welding surface 1161 of the third recess 116 of this embodiment away from the third protrusion 115 is different in shape from the fifth welding surface 1151 of the third protrusion 115. Moreover, the sixth welding surface 1161 of the third recess 116 of this embodiment away from the third protrusion 115 is the same in shape and arrangement direction as the second welding surface 1121 of the first recess 112 away from the first protrusion 111.

[0069] 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 protrusion direction and protrusion height of the first protrusion and the second protrusion are the same, the depression direction and depression height of the first depression and the second depression are the same, and 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 arranged perpendicular to each other, and a first inclination angle is formed between the first long side axis and the length direction, and the multiple first inclination angles of the same first micro-element gradually decrease from one side to the other side in the width direction, and the first inclination angle is an acute angle.

2. The heat exchange plate according to claim 1, characterized in that: The second welding surface of the first concave away from the first convex has a different shape from the first welding surface; And / or, a third welding surface of the second recess away from the second protrusion has a different shape from a fourth welding surface of the second protrusion away from the second recess.

3. The heat exchange plate according to claim 2, characterized in that: The second welding surface has a second long side axis and a second short side axis that are perpendicular to each other, and the second long side axis or the second short side axis extends in the length direction; And / or, the third welding surface has a third long side axis and a third short side axis that are perpendicular to each other, and the third long side axis or the third short side axis extends in the width direction.

4. The heat exchange plate according to claim 3, characterized in that: The second welding surface is in a shape of an ellipse, a rounded rectangle, or a rounded rhombus; And / or, the third welding surface is in a shape of an ellipse, a rounded rectangle, or a rounded rhombus; And / or, the fourth welding surface is in a shape of square, circle, or ellipse.

5. The heat exchange plate according to claim 1, characterized in that: The first welding surface is in a shape of an ellipse, a rounded rectangle, or a rounded rhombus.

6. The heat exchange plate according to claim 1, characterized in that: The first protrusion is smoothly connected to two adjacent first recesses and two adjacent second recesses, the second protrusion is smoothly connected to two adjacent first recesses and two adjacent second recesses, and the second protrusion is smoothly connected to four adjacent first protrusions.

7. The heat exchange plate according to any one of claims 1 to 5, characterized in that: The first microelement group further includes a plurality of third protrusions and a plurality of third recesses, wherein one first protrusion, one first recess, one third protrusion, and one third recess are sequentially arranged in the width direction to form a microelement unit, and the plurality of microelement units are arranged in the width direction, and two adjacent second protrusions in the width direction are respectively arranged corresponding to the first recess and the third recess in the length direction, and two adjacent second recesses in the width direction are respectively arranged corresponding to the first protrusion and the third protrusion in the length direction; The protrusion direction and protrusion height of the third protrusion are the same as those of the first protrusion, the depression direction and depression height of the third depression are the same as those of the first depression, the fifth welding surface of the third protrusion away from the third depression has a fifth long side axis and a fifth short side axis arranged perpendicular to each other, and there is a second inclination angle between the fifth long side axis and the length direction, the second inclination angle is an obtuse angle, and multiple fifth welding surfaces are arranged in parallel in the width direction.

8. The heat exchange plate according to claim 7, characterized in that: The fifth welding surface has the same shape and area as the first welding surface; And / or, a sixth welding surface of the third recess away from the third protrusion has a different shape from the fifth welding surface; And / or, the sixth welding surface of the third recess away from the third protrusion and the second welding surface of the first recess away from the first protrusion are the same in shape and arrangement direction.

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, and among 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 is in full contact with the second protrusion of the second heat exchange plate 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, so as to form a second fluid channel; Alternatively, a plurality of the heat exchange plates are stacked in the height direction of the plate heat exchanger, and among three adjacent heat exchange plates, the first welding surface of the first heat exchange plate is in full contact with the first welding surface of the second heat exchange plate, and the second protrusion of the first heat exchange plate is in full contact with the second protrusion of the second heat exchange plate, so as 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, so as 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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