Heat exchange plates, plate heat exchangers and heat exchange systems

Abstract

This invention provides a heat exchange plate, a plate heat exchanger, and a heat exchange system. The heat exchange plate is provided with multiple micro-element units. The projection of each micro-element unit along the thickness direction of the heat exchange plate is hexagonal. Six recessed portions of the micro-element unit are located at the six corners of the micro-element unit. A heat exchange section of the micro-element unit is located at the center of the micro-element unit. Six protruding portions of the micro-element unit are arranged in a hexagonal pattern with the heat exchange section as the center. The heat exchange section can be a heat exchange protrusion, with the protrusion direction and height being the same for both the protrusion and the protruding portion; or, the heat exchange section can be a heat exchange recess, with the recess direction and recess height being the same for both the heat exchange and the recessed portion. The individual micro-element units of the heat exchange plate of this invention can generate two levels of turbulent flow dynamics, multiplying the turbulence effect and improving the uniformity of flow distribution, thereby improving heat exchange performance. Furthermore, the individual micro-element unit can increase the number of welded positions, improving the strength of the welded structure, and further enhancing heat exchange performance.

Description

Technical Field

[0001] This 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 Technology

[0002] A plate heat exchanger is a high-efficiency heat exchanger composed of multiple metal heat exchange plates with a specific point-wave heat exchange structure. The point-wave heat exchange structures of adjacent heat exchange plates form staggered fluid channels, allowing cold and hot fluids to flow within these channels respectively, thus exchanging heat. Plate heat exchangers are characterized by high heat exchange efficiency, light weight, small footprint, compact structure, and long service life, and are widely used in fields including refrigeration and heating, waste heat recovery, chemical industry, aerospace, and automotive batteries, demonstrating a large market and promising development prospects.

[0003] See Figure 1 The existing heat exchange plate point wave heat exchange structure consists of multiple micro-element units 10 distributed in the horizontal and vertical directions. The projection of each micro-element unit 10 in the thickness direction of the heat exchange plate is quadrilateral. Each quadrilateral micro-element unit 10 has a first protrusion 11 at each of its four corners. A first depression 12 is provided in the middle of two adjacent first protrusions 11 in the horizontal direction. A second depression 13 is provided in the middle of two adjacent first protrusions 11 in the vertical direction. A second protrusion 14 is provided at the center of the quadrilateral micro-element unit 10. The first protrusions 11 and the second protrusions 14 have the same protrusion direction. The first depressions 12 and the second depressions 13 have the same depression direction. The depression direction of the first depression 12 is opposite to that of the first protrusions 11 in the thickness direction of the heat exchange plate. This allows the first protrusions 11, the second protrusions 14, the first depressions 12 and the second depressions 13 to disturb the fluid medium in the fluid channel.

[0004] However, because the micro-element 10 of the existing heat exchange plate has a quadrilateral projection along its thickness direction, with a second protrusion 14 located at the center of the quadrilateral micro-element 10 and four first protrusions 11, two first recesses 12, and two second recesses 13 respectively located on the outer periphery of the quadrilateral micro-element 10, each micro-element 10 only possesses a single level of turbulence dynamics, resulting in poor turbulence effect. This, in turn, affects the uniformity of flow distribution of the fluid medium within the fluid channel, leading to insufficient heat exchange capacity. Furthermore, since existing adjacent heat exchange plates form fluid channels by welding their respective protrusions to protrusions or recesses to recesses, the four first protrusions 11 and one second protrusion 14 form five welding positions, and the two first recesses 12 and two second recesses 13 form four welding positions. This means that each existing micro-element 10 can only form four or five welding positions, resulting in a small number of welding positions, which affects the strength of the welded structure and consequently the heat exchange capacity. Summary of the Invention

[0005] The first objective of this invention is to provide a heat exchange plate that enables a single micro-element unit to generate two-stage turbulent dynamics, thereby multiplying the turbulence effect and improving the uniformity of flow distribution to enhance heat exchange performance. Furthermore, the single micro-element unit can increase the number of welding positions to improve the strength of the welded structure and further enhance heat exchange performance.

[0006] A second objective of the present invention is to provide a plate heat exchanger having the above-described heat exchange plates.

[0007] A third objective of the present invention is to provide a heat exchange system having the above-described plate heat exchanger.

[0008] To achieve the first objective of this invention, a heat exchange plate is provided, comprising multiple micro-element units. Each micro-element unit is hexagonally shaped when projected along the thickness direction of the heat exchange plate, and adjacent micro-element units are connected by an edge. Each micro-element unit includes a heat exchange section, six protrusions, and six recesses. The six recesses are located at the six corners of the micro-element unit, and the heat exchange section is located at the center of the micro-element unit. The six protrusions are disposed within the micro-element unit and arranged in a hexagonal pattern with the heat exchange section as the center. The protrusion direction of the protrusions and the concave direction of the recesses are opposite in the thickness direction of the heat exchange plate. The heat exchange section is a heat exchange protrusion, and the protrusion direction and protrusion height of the heat exchange protrusions and the protrusions are the same; or, the heat exchange section is a heat exchange recess, and the concave direction and concave height of the heat exchange recesses are the same.

[0009] A preferred embodiment is that a protrusion is positioned opposite the middle of one side of the micro-element.

[0010] A further proposed solution is that the first welding surface of the protrusion away from the recess has a long side axis and a short side axis arranged perpendicularly to each other, with one long side axis extending toward the middle of one side of the micro-element.

[0011] A further proposed solution is to have a protrusion positioned opposite a corner.

[0012] A further proposed solution is that each micro-element also includes six peripheral protrusions, one of which is located in the middle of one side of the micro-element, and the protrusion direction and height of the peripheral protrusion and the protrusion part are the same.

[0013] A further proposed solution is that the first welding surface of the protrusion away from the recess has a long side axis and a short side axis arranged perpendicularly to each other, with one long side axis extending toward a corner.

[0014] A further proposed solution is to make the first welding surface into one of the following shapes: ellipse, rounded rectangle, or rounded rhombus.

[0015] A further proposed solution is that at least two of the following welding surfaces—the first welding surface of the protrusion away from the depression, the second welding surface of the depression away from the protrusion, and the third welding surface of the heat exchange section—have different areas.

[0016] To achieve the second objective 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 as described above, and the plurality of heat exchange plates are stacked in the thickness direction of the plate heat exchanger.

[0017] In three adjacent heat exchange plates, the heat exchange recess of the first heat exchange plate contacts the heat exchange recess of the second heat exchange plate, and the recess of the first heat exchange plate contacts the recess of the second heat exchange plate to form a first fluid channel; the protrusion of the second heat exchange plate contacts the protrusion of the third heat exchange plate to form a second fluid channel.

[0018] Alternatively, in three adjacent heat exchange plates, the recessed portion of the first heat exchange plate contacts the recessed portion of the second heat exchange plate to form a third fluid channel; the heat exchange protrusion of the second heat exchange plate contacts the heat exchange protrusion of the third heat exchange plate, and the protrusion of the second heat exchange plate contacts the protrusion of the third heat exchange plate to form a fourth fluid channel.

[0019] To achieve the third objective of this invention, this invention provides a heat exchange system including a plate heat exchanger, wherein the plate heat exchanger is the plate heat exchanger described above.

[0020] As can be seen from the above scheme, each micro-element of the heat exchange plate of the present invention is hexagonally arranged in the thickness direction of the heat exchange plate, and two adjacent micro-elements are connected by one edge, so that six hexagonal micro-elements are arranged around the periphery of one hexagonal micro-element. Furthermore, each micro-element of the present invention includes a heat exchange part, six protrusions and six recesses. The six recesses are respectively located at the six corners of the micro-element, the heat exchange part is located at the center of the micro-element, and the six protrusions are arranged in a hexagonal pattern with the heat exchange part as the center. This creates a first-level turbulence force between the heat exchange part at the center of the micro-element and the six hexagonally arranged protrusions, and creates a second-level turbulence force between the six hexagonally arranged protrusions and the six recesses at the six corners of the hexagonal micro-element. Thus, a single micro-element can generate two levels of turbulence force, which doubles the turbulence effect and improves the uniformity of flow distribution.

[0021] Meanwhile, in the plate heat exchanger of the present invention, in three adjacent heat exchange plates, the heat exchange portion of the first heat exchange plate contacts the heat exchange portion of the second heat exchange plate, and the recessed portion of the first heat exchange plate contacts the recessed portion of the second heat exchange plate to form a first fluid channel. Then, a single hexagonal micro-element unit can form seven welding positions in the first fluid channel. The protrusion of the second heat exchange plate contacts the protrusion of the third heat exchange plate to form a second fluid channel. Then, a single hexagonal micro-element unit can form six welding positions in the second fluid channel. Thus, a single hexagonal micro-element unit of the present invention can form six or seven welding positions, thereby increasing the number of welding positions and improving the strength of the welded structure.

[0022] Therefore, the individual micro-element units of the heat exchange plate of the present invention can form two-stage turbulent dynamics, thereby multiplying the turbulence effect, thereby improving the uniformity of flow distribution and thus improving heat exchange performance. In addition, the number of welding positions can be increased by the individual micro-element units to improve the strength of the welded structure and further improve heat exchange performance. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a quadrilateral micro-element unit of an existing heat exchange plate.

[0024] Figure 2 This is a partial structural diagram of the first embodiment of the plate heat exchanger of the present invention.

[0025] Figure 3 This is a partial exploded view of the first embodiment of the plate heat exchanger of the present invention.

[0026] Figure 4 This is a partial structural front view of the first embodiment of the plate heat exchanger of the present invention.

[0027] Figure 5 yes Figure 4Sectional view at AA.

[0028] Figure 6 This is a structural diagram of the cooperation of a single micro-unit of three adjacent heat exchange plates in the first embodiment of the plate heat exchanger of the present invention.

[0029] Figure 7 This is an exploded front view showing the interaction of multiple micro-units of the heat exchange plates in the first embodiment of the plate heat exchanger of the present invention.

[0030] Figure 8 This is a front view of a single micro-element unit of the heat exchange plate in the first embodiment of the plate heat exchanger of the present invention.

[0031] Figure 9 This is a structural diagram of a single micro-element unit of the heat exchange plate in the first embodiment of the plate heat exchanger of the present invention.

[0032] Figure 10 This is a front view of a single micro-element unit of the heat exchange plate in the second embodiment of the plate heat exchanger of the present invention.

[0033] Figure 11 This is an exploded front view showing the interaction of multiple micro-units of the heat exchange plates in the third embodiment of the plate heat exchanger of the present invention.

[0034] Figure 12 This is a structural diagram of the cooperation of a single micro-unit of three adjacent heat exchange plates in the third embodiment of the plate heat exchanger of the present invention.

[0035] Figure 13 This is a front view of the interaction of a single micro-element unit of three adjacent heat exchange plates in the third embodiment of the plate heat exchanger of the present invention.

[0036] Figure 14 yes Figure 13 Sectional view at BB.

[0037] Figure 15 yes Figure 13 Sectional view at CC.

[0038] Figure 16 This is a structural diagram of a single micro-element unit of the heat exchange plate in the third embodiment of the plate heat exchanger of the present invention.

[0039] Figure 17 This is an exploded front view of the arrangement of multiple micro-units of the heat exchange plates in the fourth embodiment of the plate heat exchanger of the present invention.

[0040] Figure 18 This is a structural diagram of the cooperation of a single micro-unit of three adjacent heat exchange plates in the fourth embodiment of the plate heat exchanger of the present invention.

[0041] Figure 19This is a front view of the interaction of a single micro-element unit of three adjacent heat exchange plates in the fourth embodiment of the plate heat exchanger of the present invention.

[0042] Figure 20 yes Figure 19 Sectional view at DD.

[0043] Figure 21 yes Figure 19 Sectional view at EE.

[0044] Figure 22 This is a structural diagram of a single micro-element unit of the heat exchange plate in the fourth embodiment of the plate heat exchanger of the present invention.

[0045] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0046] First embodiment of plate heat exchanger:

[0047] See Figures 2 to 9 This embodiment discloses a plate heat exchanger 20, which includes at least three heat exchange plates 21, and the multiple heat exchange plates 21 are stacked in the thickness direction of the plate heat exchanger 20.

[0048] In this embodiment, the heat exchange plate 21 is provided with a plurality of micro-element units 210. The projection of each micro-element unit 210 in the thickness direction of the heat exchange plate 21 is hexagonal, and two adjacent micro-element units 210 are connected by one side. That is, six hexagonal micro-element units 210 are arranged around the outer periphery of a hexagonal micro-element unit 210.

[0049] Furthermore, in this embodiment, each micro-element unit 210 includes a heat exchange section, six protrusions 212 and six recesses 213. The six recesses 213 are respectively located at the six corners of the micro-element unit 210, the heat exchange section is located at the center of the micro-element unit 210, and the six protrusions 212 are disposed in the micro-element unit 210 and arranged in a hexagon with the heat exchange section as the center. The protrusion direction of the protrusions 212 and the recess direction of the recesses 213 are opposite in the thickness direction of the heat exchange plate 21.

[0050] Specifically, in this embodiment, the heat exchange portion located at the center of the micro-element unit 210 is a heat exchange recess 211. The recess direction and recess height of the heat exchange recess 211 and the recessed portion 213 are the same. Thus, in this embodiment of the plate heat exchanger 20, among three adjacent heat exchange plates 21, the heat exchange recess 211 of the first heat exchange plate 21 contacts the heat exchange recess 211 of the second heat exchange plate 21, and the recessed portion 213 of the first heat exchange plate 21 contacts the recessed portion 213 of the second heat exchange plate 21 to form a first fluid channel 22; the protrusion 212 of the second heat exchange plate 21 contacts the protrusion 212 of the third heat exchange plate 21 to form a second fluid channel 23.

[0051] Furthermore, copper foil solder is placed at the contact points between the heat exchange recesses 211 and 211 of the first heat exchange plate 21, between the recesses 213 and 213 of the first heat exchange plate 21, and between the protrusions 212 and 212 of the second and third heat exchange plates 21. The copper foil solder is then melted at high temperature using vacuum brazing to form an integrated plate heat exchanger 20, thereby creating a first fluid channel 22 and a second fluid channel 23. The second fluid channel 23 carries the heat exchange medium, such as refrigerant, while the first fluid channel 22 carries the heat exchange medium, such as water.

[0052] In this embodiment, each micro-element unit 210 of the heat exchange plate 21 is hexagonally projected in the thickness direction of the heat exchange plate 21, and two adjacent micro-element units 210 are connected by one side, so that six hexagonal micro-element units 210 are arranged around the outer periphery of one hexagonal micro-element unit 210. Furthermore, in this embodiment, each micro-element unit 210 includes a heat exchange section, six protrusions 212, and six recesses 213. The six recesses 213 are located at the six corners of the micro-element unit 210, and the heat exchange section is located at the center of the micro-element unit 210. The six protrusions 212 are arranged in a hexagonal pattern within the micro-element unit 210 with the heat exchange section as the center. This creates a first-level turbulent flow force between the heat exchange section at the center of the micro-element unit 210 and the six protrusions 212 arranged in a hexagonal pattern, and creates a second-level turbulent flow force between the six protrusions 212 arranged in a hexagonal pattern and the six recesses 213 located at the six corners of the hexagonal micro-element unit 210. Thus, a single micro-element unit 210 can generate two levels of turbulent flow force, thereby doubling the turbulence effect and improving the uniformity of flow distribution.

[0053] Meanwhile, in this embodiment, in the plate heat exchanger 20, among three adjacent heat exchange plates 21, the heat exchange recess 211 of the first heat exchange plate 21 contacts the heat exchange recess 211 of the second heat exchange plate 21, and the recessed portion 213 of the first heat exchange plate 21 contacts the recessed portion 213 of the second heat exchange plate 21 to form a first fluid channel 22. Then, a single hexagonal micro-element unit 210 can form seven welding positions in the first fluid channel 22. The protrusion 212 of the second heat exchange plate 21 contacts the protrusion 212 of the third heat exchange plate 21 to form a second fluid channel 23. Then, a single hexagonal micro-element unit 210 can form six welding positions in the second fluid channel 23. Thus, in this embodiment, a single hexagonal micro-element unit 210 can form six or seven welding positions, thereby increasing the number of welding positions and improving the strength of the welded structure.

[0054] Therefore, in this embodiment, a single micro-element unit 210 of the heat exchange plate 21 can form two-stage turbulent dynamics, thereby multiplying the turbulence effect and improving the uniformity of flow distribution to enhance heat exchange performance. Furthermore, a single micro-element unit 210 can increase the number of welding positions to improve the strength of the welded structure and further enhance heat exchange performance.

[0055] To further enhance the turbulence control capability, in this embodiment, a protrusion 212 in a single hexagonal micro-element unit 210 is positioned opposite to the middle of one side of the micro-element unit 210. Specifically, in this embodiment, at least two of the following welding surfaces—the first welding surface 2121 of the protrusion 212 away from the recess 213, the second welding surface 2131 of the recess 213 away from the protrusion 212, and the third welding surface 2111 of the heat exchange portion—have different areas. The third welding surface 2111 of the heat exchange portion is the third welding surface 2111 of the heat exchange recess 211 away from the protrusion 212 in this embodiment.

[0056] In this embodiment, the first welding surface 2121 of the protrusion 212 is one of the following shapes: ellipse, rounded rectangle, rounded rhombus, circle, rounded square, rounded triangle, polygon with at least five sides, parallelogram, etc. In this embodiment, the third welding surface 2111 of the heat exchange recess 211 is one of the following shapes: ellipse, rounded rectangle, rounded rhombus, circle, rounded square, rounded triangle, polygon with at least five sides, parallelogram, etc.

[0057] Preferably, in this embodiment, the first welding surface 2121 of the protrusion 212 is hexagonal, and the third welding surface 2111 of the heat exchange recess 211 in this embodiment is hexagonal.

[0058] To further enhance the turbulence capability, in this embodiment, the middle part of one side of the hexagonal third welding surface 2111 of the heat exchange recess 211 is arranged opposite to one corner of the hexagonal micro-element unit 210, and in this embodiment, one side of the hexagonal first welding surface 2121 of the protrusion 212 is arranged parallel to one side of the hexagonal third welding surface 2111 of the heat exchange recess 211.

[0059] In order to improve the smoothness of fluid flow and reduce flow resistance, in this embodiment, the heat exchange recess 211 is smoothly connected to the six adjacent protrusions 212, the six protrusions 212 are smoothly connected to the six recesses 213, and the two adjacent protrusions 212 are smoothly connected to each other, and the two adjacent recesses 213 are smoothly connected to each other.

[0060] Second embodiment of plate heat exchanger:

[0061] As an explanation of the second embodiment of the plate heat exchanger of the present invention, the following description focuses only on the differences from the first embodiment of the plate heat exchanger.

[0062] See Figure 10 In this embodiment, the first welding surface 2121' of the protrusion 212' of a single hexagonal micro-element unit 210' of the heat exchange plate away from the recess 213' has a long side axis 2122 and a short side axis 2123 arranged perpendicularly to each other. One long side axis 2122 extends toward the middle of one side of the micro-element unit 210', so that the long side axis 2122 of the first welding surface 2121' of the six protrusions 212' of the single hexagonal micro-element unit 210' of the heat exchange plate in this embodiment extends radially with the heat exchange portion as the center, which can further enhance the turbulence capability. Specifically, the first welding surface 2121' of this embodiment is one of the shapes of ellipse, rounded rectangle, and rounded rhombus.

[0063] In a first alternative embodiment, in the plate heat exchanger, among three adjacent heat exchange plates, the third welding surface 2111' of the heat exchange recess 211' of the first heat exchange plate is in complete contact with the third welding surface 2111' of the heat exchange recess 211' of the second heat exchange plate, and the second welding surface 2131' of the recess 213' of the first heat exchange plate is in complete contact with the second welding surface 2131' of the recess 213' of the second heat exchange plate, to form a first fluid channel; the first welding surface 2121' of the protrusion 212' of the second heat exchange plate is in complete contact with the first welding surface 2121' of the protrusion 212' of the third heat exchange plate, to form a second fluid channel. Thus, this arrangement enables the first welding surfaces 2121' of the long side shaft 2122 and short side shaft 2123, which are perpendicularly arranged between two adjacent heat exchange plates, to form a full contact weld, further greatly improving the strength of the welded structure and thus enhancing the heat exchange capacity.

[0064] Alternatively, in this embodiment, in the plate heat exchanger, among three adjacent heat exchange plates, the third welding surface 2111' of the heat exchange recess 211' of the first heat exchange plate is in complete contact with the third welding surface 2111' of the heat exchange recess 211' of the second heat exchange plate, and the second welding surface 2131' of the recess 213' of the first heat exchange plate is in complete contact with the second welding surface 2131' of the recess 213' of the second heat exchange plate, to form a first fluid channel; the first welding surface 2121' of the protrusion 212' of the second heat exchange plate intersects with the first welding surface 2121' of the protrusion 212' of the third heat exchange plate to form a partial contact, to form a second fluid channel. Thus, this arrangement allows the first welding surfaces 2121' of the long side shaft 2122 and short side shaft 2123, which are perpendicularly arranged between two adjacent heat exchange plates, to intersect and form a partial contact weld. Simulation calculations have shown that the heat exchange capacity of the non-complete contact welding form is further improved compared to the complete contact welding form, with an average increase of about 15%. This ensures the strength of the welded structure while further enhancing the heat exchange capacity.

[0065] Third embodiment of plate heat exchanger:

[0066] As an explanation of the third embodiment of the plate heat exchanger of the present invention, the following description focuses only on the differences from the first embodiment of the plate heat exchanger.

[0067] See Figure 11 and Figure 16 In this embodiment, the heat exchange portion in a single hexagonal micro-element unit 310 of the heat exchange plate is a heat exchange protrusion 311. The protrusion direction and protrusion height of the heat exchange protrusion 311 and the protrusion portion 312 are the same.

[0068] Therefore, in this embodiment of the plate heat exchanger, among three adjacent heat exchange plates, the second welding surface 3131 of the recessed portion 313 of the first heat exchange plate contacts the second welding surface 3131 of the recessed portion 313 of the second heat exchange plate to form a first fluid channel 33; the third welding surface 3111 of the heat exchange protrusion 311 of the second heat exchange plate contacts the third welding surface 3111 of the heat exchange protrusion 311 of the third heat exchange plate, and the first welding surface 3121 of the protrusion 312 of the second heat exchange plate contacts the first welding surface 3121 of the protrusion 312 of the third heat exchange plate to form a second fluid channel 32. In this embodiment, the heat exchange medium, such as refrigerant, flows through the second fluid channel 32, and the heat exchange medium, such as water, flows through the first fluid channel 33.

[0069] Therefore, in this embodiment, each micro-element unit 310 includes a heat exchange protrusion 311, six protrusions 312, and six recesses 313. The six recesses 313 are located at the six corners of the micro-element unit 310, and the heat exchange protrusion 311 is located at the center of the micro-element unit 310. The six protrusions 312 are arranged in a hexagonal pattern within the micro-element unit 310 with the heat exchange protrusion 311 as the center. This creates a first-level turbulent flow force between the heat exchange protrusion 311 at the center of the micro-element unit 310 and the six protrusions 312 arranged in a hexagonal pattern. Furthermore, a second-level turbulent flow force is created between the six protrusions 312 arranged in a hexagonal pattern and the six recesses 313 located at the six corners of the hexagonal micro-element unit 310. This allows a single micro-element unit 310 to generate two levels of turbulent flow force, thereby multiplying the turbulence effect and improving the uniformity of flow distribution.

[0070] Fourth embodiment of plate heat exchanger:

[0071] As an explanation of the fourth embodiment of the plate heat exchanger of the present invention, the following description focuses only on the differences from the first embodiment of the plate heat exchanger.

[0072] See Figures 17 to 22 In this embodiment, a protrusion 412 in a single hexagonal micro-element unit 410 of the heat exchange plate is positioned opposite a corner of the hexagonal micro-element unit 410, such that a first-level turbulence force is formed between the heat exchange recess 411 located at the center of the micro-element unit 410 and the six protrusions 412 arranged in a hexagonal pattern, and a second-level turbulence force is formed between the six protrusions 412 arranged in a hexagonal pattern and the six recesses 413 located at the six corners of the hexagonal micro-element unit 410. Thus, a single micro-element unit 410 can generate two levels of turbulence force, thereby doubling the turbulence effect and improving the uniformity of flow distribution.

[0073] To further enhance the turbulence capability, each micro-element unit 410 in this embodiment also includes six peripheral protrusions 414. One peripheral protrusion 414 is located in the middle of one side of the micro-element unit 410, and the protrusion direction and protrusion height of the peripheral protrusion 414 and the protrusion portion 412 are the same. Therefore, in this embodiment of the plate heat exchanger, in three adjacent heat exchange plates, the heat exchange recess 411 of the first heat exchange plate contacts the heat exchange recess 411 of the second heat exchange plate, and the recessed portion 413 of the first heat exchange plate contacts the recessed portion 413 of the second heat exchange plate to form a first fluid channel 43. Thus, a single hexagonal micro-element 410 in this embodiment can form seven welding positions in the first fluid channel 43. The protrusion 412 of the second heat exchange plate contacts the protrusion 412 of the third heat exchange plate, and the peripheral protrusion 414 of the second heat exchange plate contacts the peripheral protrusion 414 of the third heat exchange plate to form a second fluid channel 42. Thus, a single hexagonal micro-element 410 in this embodiment can form twelve welding positions in the second fluid channel 42. In this embodiment, the heat exchange medium, such as refrigerant, flows through the second fluid channel 42, and the heat exchange medium, such as water, flows through the first fluid channel 43.

[0074] To further enhance the turbulence control capability, in this embodiment, the first welding surface 4121 of the protrusion 412 away from the recess 413 has a long side axis 4122 and a short side axis 4123 arranged perpendicularly to each other. One long side axis 4122 extends toward a corner of the micro-element unit 410, so that the long side axis 4122 of the first welding surface 4121 of the six protrusions 412 in the single hexagonal micro-element unit 410 of the heat exchange plate in this embodiment extends radially with the heat exchange recess 411 as the center, which can further enhance the turbulence control capability. Specifically, in this embodiment, the first welding surface 4121 is one of the shapes of an ellipse, a rounded rectangle, or a rounded rhombus.

[0075] In a first alternative embodiment, in the plate heat exchanger, among three adjacent heat exchange plates, the third welding surface 4111 of the heat exchange recess 411 of the first heat exchange plate is in complete contact with the third welding surface 4111 of the heat exchange recess 411 of the second heat exchange plate, and the second welding surface 4131 of the recess 413 of the first heat exchange plate is in complete contact with the second welding surface 4131 of the recess 413 of the second heat exchange plate, to form a first fluid channel 43; the first welding surface 4121 of the protrusion 412 of the second heat exchange plate is in complete contact with the first welding surface 4121 of the protrusion 412 of the third heat exchange plate, and the fourth welding surface 4141 of the peripheral protrusion 414 of the second heat exchange plate is in complete contact with the fourth welding surface 4141 of the peripheral protrusion 414 of the third heat exchange plate, to form a second fluid channel 42. Thus, this arrangement enables the first welding surfaces 4121, which have mutually perpendicular long side shafts 4122 and short side shafts 4123, to form a full contact weld between two adjacent heat exchange plates, further greatly improving the strength of the welded structure and enhancing the heat exchange capacity.

[0076] Alternatively, in this embodiment, in the plate heat exchanger, among three adjacent heat exchange plates, the third welding surface 4111 of the heat exchange recess 411 of the first heat exchange plate is in complete contact with the third welding surface 4111 of the heat exchange recess 411 of the second heat exchange plate, and the second welding surface 4131 of the recess 413 of the first heat exchange plate is in complete contact with the second welding surface 4131 of the recess 413 of the second heat exchange plate, to form a first fluid channel 43; the first welding surface 4121 of the protrusion 412 of the second heat exchange plate intersects with the first welding surface 4121 of the protrusion 412 of the third heat exchange plate to form partial contact, and the fourth welding surface 4141 of the peripheral protrusion 414 of the second heat exchange plate is in complete contact with the fourth welding surface 4141 of the peripheral protrusion 414 of the third heat exchange plate, to form a second fluid channel 42. Thus, this arrangement allows the first welding surfaces 4121, which are perpendicularly arranged long side shafts 4122 and short side shafts 4123, to intersect and form a partial contact weld between two adjacent heat exchange plates. Simulation calculations have shown that the heat exchange capacity of the non-complete contact welding form is further improved compared to the complete contact welding form, with an average increase of about 15%. This ensures the strength of the welded structure while further enhancing the heat exchange capacity.

[0077] The above embodiments are merely preferred examples of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles of the present invention in accordance with the claims of the present invention should be included in the scope of the present invention patent application.

Claims

1. A heat exchange plate, provided with multiple micro-element units, characterized in that: Each of the micro-element units is arranged in a hexagonal shape in the thickness direction of the heat exchange plate, and two adjacent micro-element units are connected by one edge. Each of the micro-element units includes a heat exchange section, six protrusions and six recesses. The six recesses are located at the six corners of the micro-element unit, and the heat exchange section is located at the center of the micro-element unit. The six protrusions are arranged in a hexagonal pattern within the micro-element unit with the heat exchange section as the center. The protrusion direction of the protrusions and the recess direction of the recesses are opposite to the thickness direction of the heat exchange plate. The heat exchange portion is a heat exchange protrusion, and the protrusion direction and protrusion height of the heat exchange protrusion and the protrusion portion are the same; or, the heat exchange portion is a heat exchange recess, and the recess direction and recess height of the heat exchange recess and the recess portion are the same. The first welding surface of the protrusion away from the recess has a long side axis and a short side axis that are perpendicular to each other, so that the first welding surfaces between two adjacent heat exchange plates intersect to form a local contact. One of the protrusions is disposed opposite to the middle of one side of the micro-element unit; One of the long side axes extends toward the middle of one side of the micro-element.

2. The heat exchange plate according to claim 1, characterized in that: The first welding surface is one of the following shapes: ellipse, rounded rectangle, or rounded rhombus.

3. The heat exchange plate according to claim 1 or 2, characterized in that: At least two of the following: the first welding surface of the protrusion away from the recess, the second welding surface of the recess away from the protrusion, and the third welding surface of the heat exchange portion have different areas.

4. A heat exchange plate, provided with multiple micro-element units, characterized in that: Each of the micro-element units is arranged in a hexagonal shape in the thickness direction of the heat exchange plate, and two adjacent micro-element units are connected by one edge. Each of the micro-element units includes a heat exchange section, six protrusions and six recesses. The six recesses are located at the six corners of the micro-element unit, and the heat exchange section is located at the center of the micro-element unit. The six protrusions are arranged in a hexagonal pattern within the micro-element unit with the heat exchange section as the center. The protrusion direction of the protrusions and the recess direction of the recesses are opposite to the thickness direction of the heat exchange plate. The heat exchange portion is a heat exchange protrusion, and the protrusion direction and protrusion height of the heat exchange protrusion and the protrusion portion are the same; or, the heat exchange portion is a heat exchange recess, and the recess direction and recess height of the heat exchange recess and the recess portion are the same. The first welding surface of the protrusion away from the recess has a long side axis and a short side axis that are perpendicular to each other, so that the first welding surfaces between two adjacent heat exchange plates intersect to form a local contact. One of the protrusions is disposed opposite to one of the corners; Each of the micro-element units also includes six peripheral protrusions, one of which is located at the middle of one side of the micro-element unit, and the protrusion direction and height of the peripheral protrusion and the protrusion portion are the same; One of the long side axes extends toward one of the corners.

5. The heat exchange plate according to claim 4, characterized in that: The first welding surface is one of the following shapes: ellipse, rounded rectangle, or rounded rhombus.

6. The heat exchange plate according to claim 4 or 5, characterized in that: At least two of the following: the first welding surface of the protrusion away from the recess, the second welding surface of the recess away from the protrusion, and the third welding surface of the heat exchange portion have different areas.

7. A plate heat exchanger, comprising at least three heat exchange plates, characterized in that: The heat exchange plate is any one of claims 1 to 6, and a plurality of the heat exchange plates are stacked in the thickness direction of the plate heat exchanger. In the three adjacent heat exchange plates, the heat exchange recess of the first heat exchange plate contacts the heat exchange recess of the second heat exchange plate, and the recess of the first heat exchange plate contacts the recess of the second heat exchange plate to form a first fluid channel. The protrusions of the second heat exchange plate and the protrusions of the third heat exchange plate intersect to form a partial contact, thereby forming a second fluid channel; Alternatively, in three adjacent heat exchange plates, the recessed portion of the first heat exchange plate contacts the recessed portion of the second heat exchange plate to form a third fluid channel. The heat exchange protrusions of the second heat exchange plate contact the heat exchange protrusions of the third heat exchange plate, and the protrusions of the second heat exchange plate and the protrusions of the third heat exchange plate intersect to form a partial contact, thereby forming a fourth fluid channel.

8. A heat exchange system, including a plate heat exchanger, characterized in that: The plate heat exchanger is the plate heat exchanger described in claim 7 above.

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