Plate heat exchanger and heat exchange system

Abstract

The invention provides a plate heat exchanger and a heat exchange system, a heat exchange sheet of the plate heat exchanger comprises a plurality of first heat exchange groups and a plurality of second heat exchange groups, the first heat exchange groups and the second heat exchange groups are alternately arranged in the length direction of the plate heat exchanger, each first heat exchange group comprises a plurality of first convex parts and a plurality of first concave parts, and each second heat exchange group comprises a plurality of second convex parts and a plurality of second concave parts. The second heat exchange group comprises a plurality of second convex parts and a plurality of second concave parts, a first welding surface of each first convex part is provided with a first long-side shaft and a first short-side shaft which are perpendicular to each other, a first included angle is formed between each first long-side shaft and the length direction, and the first welding surfaces of two adjacent heat exchange sheets in one group are crossed and locally contacted and welded. According to the plate heat exchanger, the flow resistance can be effectively reduced, the turbulent flow effect can be enhanced, the heat exchange capacity can be improved, the pressure difference of fluid media in every two adjacent asymmetric fluid channels can be effectively reduced, the heat exchange pieces are prevented from being bent and damaged, and the heat exchange performance is further improved.

Description

Technical Field

[0001] The present invention relates to the field of heat exchange technology, and in particular to a plate heat exchanger 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 fins with a specific point-wave heat exchange structure. The point-wave heat exchange structure of two adjacent fins 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, power generation, shipbuilding, automotive batteries, and other fields, and have a significant market and development prospects.

[0003] Fluid channels are formed between adjacent heat exchange fins in a plate heat exchanger by welding the contact surfaces of the point-wave heat exchange structures of the two adjacent fins. However, existing plate heat exchangers use a completely overlapping contact welding method between the corresponding matching welding surfaces of the two adjacent fins. This method significantly obstructs the fluid medium in the fluid channel, significantly increasing flow resistance and providing poor flow turbulence, leading to an increase in the dead zone area, thus affecting heat exchange efficiency and effectiveness. In addition, a completely overlapping contact welding is formed between the matching welding surfaces corresponding to two adjacent heat exchanger plates of the existing plate heat exchanger, so that the two adjacent fluid channels formed after the multiple heat exchanger plates in the existing plate heat exchanger are stacked in the height direction are symmetrically arranged, and the cold fluid and the hot fluid flow in the two symmetrical fluid channels respectively. In actual use, the flow rate difference between the cold fluid and the hot fluid in the two symmetrical fluid channels is large, resulting in a large pressure difference between the cold fluid and the hot fluid in the two symmetrical fluid channels, so that the heat exchanger plate between the two adjacent symmetrical fluid channels needs to withstand a large pressure, so that the heat exchanger plate between the two adjacent symmetrical fluid channels is prone to compression, bending and damage, thereby affecting the heat exchange performance. Summary of the Invention

[0004] In order to achieve the first objective of the present invention, the present invention provides a plate heat exchanger, which can effectively reduce flow resistance, enhance the turbulence effect, and effectively reduce the flow dead zone area, thereby improving the heat exchange efficiency and heat exchange effect, and further improving the heat exchange capacity. After the multiple heat exchange plates of the plate heat exchanger are stacked, they can form two adjacent asymmetric fluid channels, effectively reducing the pressure difference of the fluid medium in the two adjacent asymmetric fluid channels, so as to avoid the heat exchange plates from being bent and damaged, and further improve the heat exchange performance.

[0005] In order to achieve the second object of the present invention, the present invention provides a heat exchange system having the above-mentioned plate heat exchanger.

[0006] In order to achieve the first object of the present invention, the present invention provides a plate heat exchanger comprising at least three heat exchange fins, wherein the plurality of heat exchange fins are stacked in the height direction of the plate heat exchanger, the heat exchange fins comprising a plurality of first heat exchange groups and a plurality of second heat exchange groups, the first heat exchange groups and the second heat exchange groups are alternately arranged in the length direction of the plate heat exchanger, the first heat exchange group comprises a plurality of first protrusions and a plurality of first recesses, the first protrusions and the first recesses are alternately arranged in the width direction of the plate heat exchanger, the second heat exchange group comprises a plurality of second protrusions and a plurality of second recesses, the second protrusions and the second recesses are alternately arranged in the width direction, and the second protrusions are arranged correspondingly to the first recesses in the length direction, the second recesses are arranged correspondingly to the first protrusions in the length direction, and the protrusion directions of the first protrusions and the second protrusions are opposite The same, 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 concave portion and the second concave portion have the same concave direction, the concave height of some / all of the multiple first concave portions is less than or equal to the concave height of the second concave portion, the first welding surface of the first protrusion has a first long side axis and a first short side axis arranged perpendicular to each other, and a first angle is formed between the first long side axis and the length direction. The first welding surfaces of a group of adjacent two heat exchange plates are cross-partially contacted and welded to form a first fluid channel, and the two second protrusions in the first fluid channel are contacted and welded or have a first gap; the second concave portions of another group of adjacent two heat exchange plates are contacted and welded to form a second fluid channel, and the two first concave portions in the second fluid channel are contacted and welded or have a second gap.

[0007] As can be seen from the above scheme, the first welding surface of the first convex portion of the heat exchange plate of the present invention has a first long side axis and a first short side axis that are perpendicular to each other, and a first angle θ is formed between the first long side axis and the length direction, so that the first welding surface of the first convex portion is inclined relative to the length direction and the width direction, so that the first welding surfaces of two adjacent heat exchange plates of the plate heat exchanger of the present invention form a cross-partial contact, thereby forming a local contact welding to form a first fluid channel. Compared with the existing completely overlapping contact welding, the cross-partial contact welding can effectively reduce the flow resistance in the fluid channel by more than 20%, thereby improving the flow rate of the fluid medium in the fluid channel, so that the flow in the fluid channel The flow rate of the body medium is increased, and the first welding surfaces of the two adjacent heat exchange plates form a non-overlapping area outside the cross local contact welding, which can disturb the fluid medium in the fluid channel in multiple directions and form strong turbulence for the low-speed fluid medium, so that the fluid medium in the fluid channel forms a "cross flow" and "zigzag flow" flow pattern, which significantly enhances the disturbance effect and effectively reduces the flow dead zone area. Moreover, under the disturbance and diversion effect of the first long side axis and the first short side axis of the first welding surface in the non-overlapping area relative to the length direction and the width direction, it is more conducive to the uniform distribution of the flow of the fluid medium, thereby improving the heat exchange efficiency and heat exchange effect, and thus improving the heat exchange capacity.

[0008] In addition, the first welding surface of the plate heat exchanger of the present invention forms a cross-local contact to form a local contact welding, so that the first fluid channel and the second fluid channel form an asymmetric fluid channel, that is, after a plurality of heat exchange plates are stacked, two adjacent asymmetric fluid channels can be formed, which effectively reduces the pressure difference of the fluid medium in the two adjacent asymmetric fluid channels, thereby avoiding the phenomenon of compression, bending and damage of the heat exchange plate, and further improving the heat exchange performance.

[0009] Therefore, the plate heat exchanger of the present invention can effectively reduce flow resistance, enhance the turbulence effect, and effectively reduce the flow dead zone area, thereby improving the heat exchange efficiency and heat exchange effect, and further improving the heat exchange capacity. Moreover, after the multiple heat exchange plates of the plate heat exchanger are stacked, two adjacent asymmetric fluid channels can be formed, which effectively reduces the pressure difference of the fluid medium in the two adjacent asymmetric fluid channels, thereby avoiding the phenomenon of compression, bending and damage of the heat exchange plates, and further improving the heat exchange performance.

[0010] A further solution is that two adjacent first welding surfaces in the width direction are arranged in parallel; or, two adjacent first welding surfaces in the width direction are arranged symmetrically with respect to the first recess.

[0011] A further solution is that the first heat exchange group also includes multiple third protrusions and multiple third recesses, a first protrusion, a first recess, a third protrusion, a third recess, a first protrusion and a first recess are arranged in sequence in the width direction to form a microelement unit, multiple microelement units are arranged in the width direction, the third protrusion is arranged corresponding to the second recess in the length direction, the third recess is arranged corresponding to the second protrusion in the length direction, the protruding direction and protruding height of the third protrusion are the same as those of the first protrusion, the recessed direction and recessed height of the third recess are the same as those of the first recess, and the shape and area of the third welding surface of the third protrusion are the same as those of the first welding surface; in a microelement unit, the two first welding surfaces are symmetrically arranged about the middle of the third protrusion, and the third welding surface is arranged parallel to one of the first welding surfaces.

[0012] A further solution is that the first angle is between 10° and 80°; and / or the volume ratio between the first fluid channel and the second fluid channel is between 0.3 and 0.9; and / or the second convex portion has a first spacing with the second concave portion in the height direction, the first convex portion has a second spacing with the second concave portion in the height direction, and the ratio between the first spacing and the second spacing is between 0.2 and 0.8; and / or the first concave portion has a third spacing with the first convex portion in the height direction, the second concave portion has a fourth spacing with the first convex portion in the height direction, and the ratio between the third spacing and the fourth spacing is between 0.2 and 0.8.

[0013] A further solution is that the second welding surface of the second recess has a second long side axis and a second short side axis arranged perpendicular to each other; the second long side axis extends in the width direction; or the second long side axis is arranged parallel to the first long side axis in the length direction.

[0014] A further solution is that the fourth welding surface of the first recess has a fourth long side axis and a fourth short side axis that are arranged perpendicular to each other; the fourth long side axis extends in the length direction; or, the fourth long side axis is arranged parallel to the first long side axis in the width direction, and the two adjacent first welding surfaces in the width direction are arranged parallel.

[0015] A further solution is that the fourth welding surface of the first recess includes a connected rectangular surface and a triangular surface, and a drainage axis is formed between the drainage angle of the triangular surface away from the rectangular surface and the middle of the side of the rectangular surface away from the triangular surface, and the drainage axis extends in the length direction.

[0016] A further solution is that the fifth welding surface of the second protrusion is square, two corners of the fifth welding surface are arranged side by side in the width direction, and the other two corners of the fifth welding surface are arranged side by side in the length direction.

[0017] A further solution is that the area of the first welding surface is larger than any area of the second welding surface of the second recess, the fourth welding surface of the first recess, and the fifth welding surface of the second protrusion; and / or the first welding surface is an elliptical, rectangular, or diamond shape.

[0018] In order to achieve the second 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the first embodiment of the plate heat exchanger of the present invention.

[0020] Figure 2 This is a structural diagram of the coordination of multiple heat exchange fins in the first embodiment of the plate heat exchanger of the present invention.

[0021] Figure 3 It is an exploded view of the coordination of multiple heat exchange fins in the first embodiment of the plate heat exchanger of the present invention.

[0022] Figure 4 This is a front view of the coordination of multiple heat exchange fins in the first embodiment of the plate heat exchanger of the present invention.

[0023] Figure 5 yes Figure 4 Cross-sectional view at AA.

[0024] Figure 6 yes Figure 4 Cross-sectional view at BB.

[0025] Figure 7 This is a structural diagram of cross-partial contact welding of the first welding surfaces of two adjacent heat exchange fins in the first embodiment of the plate heat exchanger of the present invention.

[0026] Figure 8 It is a schematic diagram of cross-partial contact welding of first welding surfaces of two adjacent heat exchange fins in the first embodiment of the plate heat exchanger of the present invention.

[0027] Figure 9 It is a structural diagram of the heat exchange fins in the first embodiment of the plate heat exchanger of the present invention.

[0028] Figure 10 It is a front view of the heat exchange fins in the first embodiment of the plate heat exchanger of the present invention.

[0029] Figure 11 It is a front view of the heat exchange fins in the second embodiment of the plate heat exchanger of the present invention.

[0030] Figure 12 It is a front view of the heat exchange fins in the third embodiment of the plate heat exchanger of the present invention.

[0031] Figure 13 It is a front view of the heat exchange fins in the fourth embodiment of the plate heat exchanger of the present invention.

[0032] Figure 14 yes Figure 13 Cross-sectional view at CC.

[0033] Figure 15 It is a front view of the heat exchange fins in the fifth embodiment of the plate heat exchanger of the present invention.

[0034] Figure 16 It is a front view of the heat exchange fins in the sixth embodiment of the plate heat exchanger of the present invention.

[0035] Figure 17 Schematic diagram of partial contact welding of the fourth welding surfaces of two adjacent heat exchange fins in the sixth embodiment of the plate heat exchanger of the present invention.

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0037] The first embodiment of the plate heat exchanger: See also Figures 1 to 10 This embodiment discloses a plate heat exchanger 10, including at least three heat exchange fins 12, four joints 14, an upper end plate 11 and a lower end plate 13. The multiple heat exchange fins 12 are stacked between the upper end plate 11 and the lower end plate 13 in the height direction Z of the plate heat exchanger 10, and the four joints 14 are protrudingly arranged on the upper end plate 11.

[0038] Among them, the heat exchange plate 12 of this embodiment includes multiple first heat exchange groups and multiple second heat exchange groups, the first heat exchange groups and the second heat exchange groups are alternately arranged in the length direction Y of the plate heat exchanger 10, the first heat exchange group includes multiple first protrusions 121 and multiple first recesses 122, the first protrusions 121 and the first recesses 122 are alternately arranged in the width direction X of the plate heat exchanger 10, the second heat exchange group includes multiple second protrusions 123 and multiple second recesses 124, the second protrusions 123 and the second recesses 124 are alternately arranged in the width direction X, and the second protrusions 123 are corresponding to the first recesses 122 in the length direction Y, and the second recesses 124 are corresponding to the first protrusions 121 in the length direction Y.

[0039] Furthermore, in this embodiment, the first convex portion 121 and the second convex portion 123 have the same protruding direction, and the protruding height of some / all of the plurality of second convex portions 123 is less than or equal to the protruding height of the first convex portion 121. The first concave portion 122 and the second concave portion 124 have the same concave direction, and the concave height of some / all of the plurality of first concave portions 122 is less than or equal to the concave height of the second concave portion 124. The first welding surface 1211 of the first convex portion 121 has a first long axis 1214 and a first short axis 1215 that are perpendicular to each other, and the first long axis 1214 forms a first angle θ with the longitudinal direction Y. Specifically, the protruding direction of the first convex portion 121 and the concave direction of the second concave portion 124 are opposite in the height direction Z. In this embodiment, the first welding surface 1211 is the end surface of the first convex portion 121 that is away from the second concave portion 124 in the height direction Z.

[0040] Moreover, the first welding surfaces 1211 of a group of two adjacent heat exchange fins 12 of the plate heat exchanger 10 of this embodiment are cross-welded to form a first fluid channel 15, and the two second protrusions 123 in the first fluid channel 15 are welded to each other or have a first gap H1; the second recesses 124 of another group of two adjacent heat exchange fins 12 of the plate heat exchanger 10 of this embodiment are welded to each other to form a second fluid channel 16, and the two first recesses 122 in the second fluid channel 16 are welded to each other or have a second gap H2 (as shown in FIG. Figure 14 Specifically, in this embodiment, the first welding surfaces 1211 of two adjacent heat exchanger plates 12 are in cross-partial contact, that is, the first long side axes 1214 of the two corresponding first welding surfaces 1211 of the two adjacent heat exchanger plates 12 are intersected and placed, so that the first welding surfaces 1211 of the two adjacent heat exchanger plates 12 form a cross-partial contact weld 1212 (as shown). Figure 8 shown).

[0041] Combine Figure 7 and Figure 8In this embodiment, the first welding surface 1211 of the first protrusion 121 of the heat exchanger 12 has a first long side axis 1214 and a first short side axis 1215 that are perpendicular to each other. The first long side axis 1214 has a first angle θ with the length direction Y, so that the first welding surface 1211 of the first protrusion 121 is tilted relative to the length direction Y and the width direction X, so that the first welding surfaces 1211 of two adjacent heat exchanger fins 12 of the plate heat exchanger 10 of this embodiment form a cross-partial contact, thereby forming a local contact weld 1212 to form a first fluid channel 15. Compared with the existing completely overlapping contact weld, the cross-partial contact weld 1212 can effectively reduce the flow resistance in the fluid channel by more than 20%, thereby improving the flow rate of the fluid medium in the fluid channel, so that the flow The flow rate of the fluid medium in the body channel is increased, and the first welding surfaces 1211 of the two adjacent heat exchange plates 12 form a non-overlapping area 1213 outside the cross local contact welding 1212, which can disturb the fluid medium in the fluid channel in multiple directions, and can form strong turbulence for the low-speed fluid medium, so that the fluid medium in the fluid channel forms a flow pattern of "cross flow" and "zigzag flow", which significantly enhances the disturbance effect and effectively reduces the flow dead zone area. In addition, under the disturbance and diversion effect of the first long side axis 1214 and the first short side axis 1215 of the first welding surface 1211 in the non-overlapping area 1213 relative to the length direction Y and the width direction X, it is more conducive to the uniform distribution of the flow of the fluid medium, thereby improving the heat exchange efficiency and heat exchange effect, and thus improving the heat exchange capacity.

[0042] In addition, the first welding surface 1211 of the plate heat exchanger 10 of this embodiment forms a cross-local contact to form a local contact weld 1212, so that the first fluid channel 15 and the second fluid channel 16 form an asymmetric fluid channel, that is, a plurality of heat exchange plates 12 can be stacked to form two adjacent asymmetric fluid channels, effectively reducing the pressure difference of the fluid medium in the two adjacent asymmetric fluid channels, so as to avoid the heat exchange plate 12 from being compressed, bent and damaged, thereby further improving the heat exchange performance.

[0043] Therefore, the plate heat exchanger 10 of this embodiment can effectively reduce flow resistance, enhance the turbulence effect, and effectively reduce the flow dead zone area, thereby improving the heat exchange efficiency and heat exchange effect, and thus improving the heat exchange capacity. Moreover, the multiple heat exchange plates 12 of the plate heat exchanger 10 can form two adjacent asymmetric fluid channels after being stacked, effectively reducing the pressure difference of the fluid medium in the two adjacent asymmetric fluid channels, so as to avoid the heat exchange plate 12 from being compressed, bent, and damaged, thereby further improving the heat exchange performance.

[0044] Combine Figures 4 to 6In this embodiment, the raised height of all second protrusions 123 is less than the raised height of the first protrusion 121, and the recessed height of all first recesses 122 is equal to the recessed height of the second recess 124. Consequently, among three adjacent heat exchange fins 12, the first welding surface 1211 of the first heat exchange fin 12 and the first welding surface 1211 of the second heat exchange fin 12 cross and partially contact each other, forming a partial contact weld 1212. A first gap H1 is defined between the second protrusion 123 of the first heat exchange fin 12 and the second protrusion 123 of the second heat exchange fin 12, forming a first fluid channel 15. The first recess 122 of the second heat exchange fin 12 and the first recess 122 of the third heat exchange fin 12 are contact welded together, and the second recess 124 of the second heat exchange fin 12 and the second recess 124 of the third heat exchange fin 12 are contact welded together, forming a second fluid channel 16. The presence of the first gap H1 further enhances the flow disturbance effect, facilitates uniform flow distribution of the fluid medium, and thus improves heat exchange performance.

[0045] Specifically, in this embodiment, copper foil solder is placed at the intersection and local contact between the first welding surface 1211 of the first heat exchanger fin 12 and the first welding surface 1211 of the second heat exchanger fin 12, copper foil solder is placed at the contact between the first recess 122 of the second heat exchanger fin 12 and the first recess 122 of the third heat exchanger fin 12, and copper foil solder is placed at the contact between the second recess 124 of the second heat exchanger fin 12 and the second recess 124 of the third heat exchanger fin 12. The copper foil solder is melted at high temperature by vacuum brazing to form the integrated plate heat exchanger 10, thereby forming the first fluid channel 15 and the second fluid channel 16. The first fluid channel 15 is a flow medium, such as a refrigerant, and the second fluid channel 16 is a flow medium, such as water.

[0046] To improve the weld stability between two adjacent heat exchange fins 12 and thereby enhance the structural strength of the plate heat exchanger 10, in this embodiment, the first recesses 122 of two adjacent heat exchange fins 12 are welded together in full contact with each other at the fourth welding surfaces 1221 that are distal to the second protrusions 123 in the height direction Z, and the second recesses 124 of two adjacent heat exchange fins 12 are welded together in full contact with each other at the second welding surfaces 1241 that are distal to the second protrusions 123 in the height direction Z. Specifically, in this embodiment, the fourth welding surfaces 1221 of the first recesses 122 and the second welding surfaces 1241 of the second recesses 124 are both circular, but polygonal shapes may also be employed.

[0047] In order to further improve the turbulence effect, the fifth welding surface 1231 of the second convex portion 123 of this embodiment, which is away from the second concave portion 124 in the height direction Z, is square, and two corners of the fifth welding surface 1231 are arranged side by side in the width direction X, and the other two corners of the fifth welding surface 1231 are arranged side by side in the length direction Y, so that the four sides of the square fifth welding surface 1231 are inclined relative to the length direction Y and the width direction X, respectively, which is more conducive to turbulence and diversion of the fluid medium in the fluid channel, thereby enhancing the turbulence effect, and is more conducive to uniform distribution of the flow of the fluid medium, thereby improving heat exchange performance. Specifically, in this embodiment, there is a first gap H1 between the fifth welding surfaces 1231 of the second protrusions 123 of two adjacent heat exchanger plates 12, so that there is no welding between the fifth welding surfaces 1231 of the second protrusions 123 of the two adjacent heat exchanger plates 12. When the protrusion height of the second protrusion 123 is equal to the protrusion height of the first protrusion 121, the fifth welding surfaces 1231 of the second protrusions 123 of the two adjacent heat exchanger plates 12 are in a contact welding state.

[0048] In order to further improve the flow disturbance effect, the two adjacent first welding surfaces 1211 of the heat exchange plate 12 in the width direction X of this embodiment are symmetrically arranged about the first recess 122, so that the inclination directions of the first welding surfaces 1211 of the two adjacent first protrusions 121 in the width direction X are opposite / departed from each other, which can multiply the flow disturbance capability, thereby improving the flow distribution uniformity of the fluid medium, and further multiplying the heat exchange performance.

[0049] Furthermore, the first angle θ between the first long axis 1214 of the first welded surface 1211 of the first protrusion 121 of this embodiment and the longitudinal direction Y is between 10° and 80°. Preferably, the first angle θ between the first long axis 1214 of the first welded surface 1211 of the first protrusion 121 of this embodiment and the longitudinal direction Y is 40° or 50°, thereby further improving the flow disturbance effect and flow distribution uniformity. Furthermore, the volume ratio between the first fluid channel 15 and the second fluid channel 16 of this embodiment is between 0.3 and 0.9, further effectively reducing the pressure difference between the fluid media in the two adjacent asymmetric fluid channels, thereby preventing the heat exchange fins 12 from being bent and damaged, and further improving heat exchange performance.

[0050] To further enhance the spoiler effect, the area of the first welding surface 1211 of this embodiment is larger than any of the areas of the second welding surface 1241 of the second concave portion 124, the fourth welding surface 1221 of the first concave portion 122, and the fifth welding surface 1231 of the second convex portion 123. Specifically, the first welding surface 1211 of this embodiment is one of an ellipse, a rectangle, and a diamond.

[0051] In order to improve the flow smoothness of the fluid medium and further reduce the flow resistance, the adjacent convex and concave features in the first convex portion 121, the first concave portion 122, the second convex portion 123 and the second concave portion 124 of this embodiment are smoothly connected by smooth curved surfaces, thereby reducing the risk of molding cracking of the heat exchange plate 12 and improving the structural strength of the heat exchange plate 12.

[0052] The second embodiment of the plate heat exchanger: 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.

[0053] See also Figure 11 In this embodiment, the fourth welding surface 1221 of the first recess 122 has a fourth long side axis 1222 and a fourth short side axis that are perpendicular to each other. The fourth long side axis 1222 extends in the length direction Y, which is more conducive to disturbing and diverting the fluid medium in the fluid channel, thereby enhancing the disturbance effect and being more conducive to uniform distribution of the flow of the fluid medium, thereby improving the heat exchange performance.

[0054] The fourth welding surface 1221 of the first recess 122 is in a shape selected from the group consisting of an ellipse, a rectangle, and a diamond. Preferably, the fourth welding surface 1221 of the first recess 122 of the present embodiment is a diamond. Since the fourth long side axis 1222 of the diamond-shaped fourth welding surface 1221 extends in the length direction Y, the four sides of the diamond-shaped fourth welding surface 1221 are inclined to the width direction X and the length direction Y, respectively, which is further beneficial for disturbing and diverting the fluid medium in the fluid channel, thereby enhancing the disturbance effect and being more beneficial for uniform flow distribution of the fluid medium, thereby improving heat exchange performance.

[0055] In addition, the second welding surface 1241 of the second recess 124 of this embodiment has a second long side axis 1242 and a second short side axis arranged perpendicular to each other, and the second long side axis 1242 extends in the width direction X, which is more conducive to disturbing and diverting the fluid medium in the fluid channel, thereby enhancing the disturbance effect, and is more conducive to the uniform distribution of the flow of the fluid medium, thereby improving the heat exchange performance.

[0056] The second welding surface 1241 of the second recess 124 is in a shape selected from the group consisting of an ellipse, a rectangle, and a diamond. Preferably, the second welding surface 1241 of the second recess 124 in this embodiment is a diamond. Since the second long side axis 1242 of the diamond-shaped second welding surface 1241 extends in the width direction X, the four sides of the diamond-shaped second welding surface 1241 are inclined to the width direction X and the length direction Y, respectively, which is further beneficial for disturbing and diverting the fluid medium in the fluid channel, thereby enhancing the disturbing effect and being more beneficial for uniform flow distribution of the fluid medium, thereby improving heat exchange performance.

[0057] The third embodiment of the plate heat exchanger: As an explanation of the third embodiment of the plate heat exchanger of the present invention, only the differences from the second embodiment of the plate heat exchanger are described below.

[0058] See also Figure 12 In this embodiment, the second welding surface 1241 of the second recess 124 has a second long side axis 1242 and a second short side axis which are perpendicular to each other. The second long side axis 1242 is parallel to the first long side axis 1214 in the length direction Y, so that the disturbance and diversion directions of the second welding surface 1241 of the second recess 124 are consistent with the disturbance and diversion directions of the first welding surface 1211 of the first convex portion 121, and the second welding surfaces 1241 of two adjacent heat exchange plates 12 are cross-partially contacted to form a local contact weld 1212, thereby doubling the disturbance effect, which is more conducive to the uniform distribution of the flow of the fluid medium, thereby improving the heat exchange performance.

[0059] In order to further improve the spoiler effect, the second welding surface 1241 of the second concave portion 124 of this embodiment is elliptical, and the first welding surface 1211 of the first convex portion 121 is also elliptical, but the area of the elliptical second welding surface 1241 is smaller than the area of the elliptical first welding surface 1211, thereby doubling the spoiler effect.

[0060] The fourth embodiment of the plate heat exchanger: 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 10 are described below.

[0061] See also Figure 13 and Figure 14 In this embodiment, the two adjacent first welding surfaces 1211 of the heat exchanger 12 in the width direction X are arranged in parallel, and the raised heights of all the second protrusions 123 of this embodiment are smaller than the raised heights of the first protrusions 121, and the recessed heights of all the first recesses 122 are smaller than the recessed heights of the second recesses 124. Thus, among the three adjacent heat exchanger fins 12, the first welding surface 1211 of the first heat exchanger fin 12 and the first welding surface 1211 of the second heat exchanger fin 12 cross and partially contact to form a local contact weld 1212, and the second protrusions 1211 of the first heat exchanger fin 12 are partially contacted to form a local contact weld 1212. A first gap H1 is defined between the first convex portion 123 of the second heat exchange fin 12 and the second convex portion 123 of the second heat exchange fin 12, to form a first fluid channel 15; a second gap H2 is defined between the first concave portion 122 of the second heat exchange fin 12 and the first concave portion 122 of the third heat exchange fin 12, and the second concave portion 124 of the second heat exchange fin 12 and the second concave portion 124 of the third heat exchange fin 12 are contacted and welded to form a second fluid channel 16. The presence of the first gap H1 and the second gap H2 can further enhance the flow turbulence effect, which is more conducive to uniform flow distribution of the fluid medium, thereby improving heat exchange performance.

[0062] Specifically, in this embodiment, the second protrusion 123 has a first spacing h1 with the second concave portion 124 in the height direction Z, the first protrusion 121 has a second spacing h2 with the second concave portion 124 in the height direction Z, and the ratio of the first spacing h1 to the second spacing h2 is between 0.2 and 0.8. In addition, in this embodiment, the first concave portion 122 has a third spacing h3 with the first protrusion 121 in the height direction Z, the second concave portion 124 has a fourth spacing h4 with the first protrusion 121 in the height direction Z, and the ratio of the third spacing h3 to the fourth spacing h4 is between 0.2 and 0.8.

[0063] In order to further improve the turbulence effect, the fourth welding surface 1221 of the first recess 122 of this embodiment has a fourth long side axis 1222 and a fourth short side axis arranged perpendicular to each other. The fourth long side axis 1222 is arranged parallel to the first long side axis 1214 in the width direction X, and the two adjacent first welding surfaces 1211 in the width direction X are arranged parallel to each other, so that the turbulence and diversion directions of the fourth welding surface 1221 of the first recess 122 are consistent with the turbulence and diversion directions of the first welding surface 1211 of the first convex portion 121, and the fourth welding surfaces 1221 of the two adjacent heat exchange plates 12 are cross-partially contacted to form a local contact weld 1212, thereby doubling the turbulence effect, which is more conducive to the uniform distribution of the flow of the fluid medium, thereby improving the heat exchange performance. Specifically, in this embodiment, the fourth welding surface 1221 of the first concave portion 122 is elliptical, and the first welding surface 1211 of the first convex portion 121 is also elliptical, but the area of the elliptical fourth welding surface 1221 is smaller than the area of the elliptical first welding surface 1211, thereby doubling the turbulence effect.

[0064] To further enhance the flow disturbance effect, the second welded surface 1241 of the second recess 124 has a second long axis 1242 and a second short axis that are perpendicular to each other. The second long axis 1242 is parallel to the first long axis 1214 in the longitudinal direction Y. This ensures that the flow disturbance and diversion directions of the second welded surface 1241 of the second recess 124 are consistent with those of the first welded surface 1211 of the first protrusion 121. Furthermore, the second welded surfaces 1241 of two adjacent heat exchange fins 12 intersect and partially contact each other to form a partial contact weld 1212, thereby doubling the flow disturbance effect and further facilitating uniform flow distribution of the fluid medium, thereby improving heat exchange performance. Specifically, in this embodiment, the second welded surface 1241 of the second recess 124 is elliptical, and the first welded surface 1211 of the first protrusion 121 is also elliptical, except that the area of the elliptical second welded surface 1241 is smaller than that of the elliptical first welded surface 1211, thereby doubling the flow disturbance effect.

[0065] The fifth embodiment of the plate heat exchanger: As an explanation of the fifth 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 15 The first heat exchange group of the plate heat exchanger 10 of this embodiment further includes a plurality of third protrusions 125 and a plurality of third recesses 126. A first protrusion 121, a first recess 122, a third protrusion 125, a third recess 126, a first protrusion 121, and a first recess 122 are sequentially arranged in the width direction X to form a micro unit. The plurality of micro units are arranged in the width direction X. The third protrusion 125 is arranged corresponding to the second recess 124 in the length direction Y. The third recess 126 is arranged in the length direction Y. The third convex portion 125 is arranged corresponding to the second convex portion 123, and the protruding direction and protruding height of the third convex portion 125 are the same as those of the first convex portion 121, the concave direction and concave height of the third concave portion 126 are the same as those of the first concave portion 122, and the shape and area of the third welding surface 1251 of the third convex portion 125 are the same as those of the first welding surface 1211; in a microelement unit, the two first welding surfaces 1211 are symmetrically arranged about the middle part of the third convex portion 125, and the third welding surface 1251 is arranged parallel to one of the first welding surfaces 1211.

[0067] Thus, while the first welding surfaces 1211 of the first protrusions 121 of two adjacent heat exchange fins 12 of the plate heat exchanger 10 of this embodiment are cross-partially contacted and welded 1212, the third welding surfaces 1251 of the third protrusions 125 of the two adjacent heat exchange fins 12 are also cross-partially contacted and welded, thereby improving the strength of the welding structure while further enhancing the flow disturbance effect, being more conducive to the uniform distribution of the flow of the fluid medium, and thus improving the heat exchange performance.

[0068] The sixth embodiment of the plate heat exchanger: As an explanation of the sixth 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.

[0069] See also Figure 16 and Figure 17In this embodiment, the two adjacent first welding surfaces 1211 of the heat exchanger 12 in the width direction X are arranged in parallel, and the fourth welding surface 1221 of the first recess 122 in this embodiment includes a rectangular surface 12211 and a triangular surface 12212 connected to each other. A drainage axis 12213 is formed between the drainage angle of the triangular surface 12212 away from the rectangular surface 12211 and the middle of the side of the rectangular surface 12211 away from the triangular surface 12212. The drainage axis 12213 extends in the length direction Y, so that the fourth welding surfaces 1221 of the two adjacent heat exchanger fins 12 of the plate heat exchanger 10 in this embodiment are formed. The locally overlapping contact welds 12214 can reduce the flow resistance in the fluid channel, thereby increasing the flow rate of the fluid medium in the fluid channel, and increasing the flow rate of the fluid medium in the fluid channel. The non-overlapping area 12215 between the fourth welding surfaces 1221 of the two adjacent heat exchange plates 12 can disturb the fluid medium in the fluid channel, so that after the fluid medium in the fluid channel flows around the locally overlapping welds, the disturbance and diversion of the non-overlapping area 12215 can enhance the disturbance effect, which is more conducive to the uniform distribution of the flow of the fluid medium, thereby improving the heat exchange performance.

[0070] In addition, the second welding surface 1241 of the second recess 124 of this embodiment has a second long side axis 1242 and a second short side axis arranged perpendicular to each other, and the second long side axis 1242 extends in the width direction X, which is more conducive to disturbing and diverting the fluid medium in the fluid channel, thereby enhancing the disturbance effect, and is more conducive to the uniform distribution of the flow of the fluid medium, thereby improving the heat exchange performance.

[0071] The second welding surface 1241 of the second recess 124 is in a shape selected from the group consisting of an ellipse, a rectangle, and a diamond. Preferably, the second welding surface 1241 of the second recess 124 in this embodiment is a diamond. Since the second long side axis 1242 of the diamond-shaped second welding surface 1241 extends in the width direction X, the four sides of the diamond-shaped second welding surface 1241 are inclined to the width direction X and the length direction Y, respectively, which is further beneficial for disturbing and diverting the fluid medium in the fluid channel, thereby enhancing the disturbing effect and being more beneficial for uniform flow distribution of the fluid medium, thereby improving heat exchange performance.

[0072] 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 plate heat exchanger comprising at least three heat exchange fins, wherein the plurality of heat exchange fins are stacked in a height direction of the plate heat exchanger, characterized in that: The heat exchange fins include a plurality of first heat exchange groups and a plurality of second heat exchange groups, the first heat exchange groups and the second heat exchange groups are alternately arranged in the longitudinal direction of the plate heat exchanger, the first heat exchange group includes a plurality of first protrusions and a plurality of first recesses, the first protrusions and the first recesses are alternately arranged in the width direction of the plate heat exchanger, the second heat exchange group includes a plurality of second protrusions and a plurality of second recesses, the second protrusions and the second recesses are alternately arranged in the width direction, and the second protrusions are arranged corresponding to the first recesses in the longitudinal direction, and the second recesses are arranged corresponding to the first protrusions in the longitudinal direction; The first convex portion and the second convex portion have the same convex direction, and the convex height of some / all of the plurality of second convex portions is less than or equal to the convex height of the first convex portion; the first concave portion and the second concave portion have the same concave direction, and the concave height of some / all of the plurality of first concave portions is less than or equal to the concave height of the second concave portion; the first welding surface of the first convex portion has a first long side axis and a first short side axis that are perpendicular to each other, and the first long side axis forms a first angle with the longitudinal direction; The first welding surfaces of two adjacent heat exchange plates in a group are cross-welded and partially contacted to form a first fluid channel, and the two second protrusions in the first fluid channel are contacted and welded or have a first gap; the second recesses of two adjacent heat exchange plates in another group are contacted and welded to form a second fluid channel, and the two first recesses in the second fluid channel are contacted and welded or have a second gap.

2. The plate heat exchanger according to claim 1, characterized in that: Two adjacent first welding surfaces in the width direction are arranged in parallel; Alternatively, two adjacent first welding surfaces in the width direction are symmetrically arranged about the first recess.

3. The plate heat exchanger according to claim 1, characterized in that: The first heat exchange group further includes a plurality of third convex portions and a plurality of third concave portions, wherein one first convex portion, one first concave portion, one third convex portion, one third concave portion, one first convex portion, and one first concave portion are sequentially arranged in the width direction to form a micro unit, and the plurality of micro units are arranged in the width direction, the third convex portion is arranged corresponding to the second concave portion in the length direction, and the third concave portion is arranged corresponding to the second convex portion in the length direction; The protruding direction and protruding height of the third convex portion are the same as those of the first convex portion, the concave direction and concave height of the third concave portion are the same as those of the first concave portion, and the shape and area of the third welding surface of the third convex portion are the same as those of the first welding surface; in one of the microelement units, the two first welding surfaces are symmetrically arranged about the middle part of the third convex portion, and the third welding surface is arranged parallel to one of the first welding surfaces.

4. The plate heat exchanger according to claim 1, characterized in that: The first angle is between 10° and 80°; and / or, the volume ratio between the first fluid channel and the second fluid channel is between 0.3 and 0.9; And / or, the second convex portion has a first distance from the second concave portion in the height direction, the first convex portion has a second distance from the second concave portion in the height direction, and a ratio of the first distance to the second distance is between 0.2 and 0.8; And / or, the first concave portion has a third distance from the first convex portion in the height direction, the second concave portion has a fourth distance from the first convex portion in the height direction, and the ratio of the third distance to the fourth distance is between 0.2 and 0.

8.

5. The plate heat exchanger according to claim 1, characterized in that: The second welding surface of the second recess has a second long side axis and a second short side axis that are perpendicular to each other; The second long side axis extends in the width direction; Alternatively, the second long side axis is arranged parallel to the first long side axis in the length direction.

6. The plate heat exchanger according to claim 1, characterized in that: The fourth welding surface of the first recess has a fourth long side axis and a fourth short side axis that are perpendicular to each other; The fourth long side axis extends in the longitudinal direction; Alternatively, the fourth long side axis is arranged parallel to the first long side axis in the width direction, and two adjacent first welding surfaces in the width direction are arranged parallel to each other.

7. The plate heat exchanger according to claim 1, characterized in that: The fourth welding surface of the first recess includes a connected rectangular surface and a triangular surface, and a drainage axis is formed between the drainage angle of the triangular surface away from the rectangular surface and the middle of the side of the rectangular surface away from the triangular surface, and the drainage axis extends in the length direction.

8. The plate heat exchanger according to claim 1, characterized in that: The fifth welding surface of the second protrusion is square, two corners of the fifth welding surface are arranged side by side in the width direction, and the other two corners of the fifth welding surface are arranged side by side in the length direction.

9. The plate heat exchanger according to any one of claims 1 to 8, characterized in that: The area of the first welding surface is larger than any of the areas of the second welding surface of the second concave portion, the fourth welding surface of the first concave portion, and the fifth welding surface of the second convex portion; And / or, the first welding surface is in a shape of an ellipse, a rectangle, or a diamond.

10. A heat exchange system including a plate heat exchanger, characterized in that: The plate heat exchanger is the plate heat exchanger according to any one of claims 1 to 9.

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