A heat exchanger

Abstract

The present application discloses a heat exchanger comprising a plurality of heat exchange plates, the heat exchange plates comprising a first plate, a second plate, and a third plate. A first heat exchange channel is defined between the first plate and the second plate, and a second heat exchange channel is defined between the second plate and the third plate. The flow area of the second heat exchange channel is greater than the flow area of the first heat exchange channel. The first heat exchange channel is for circulation of refrigerant, and the second heat exchange channel is for circulation of heat exchange fluid. The second plate has a first protrusion protruding toward the first plate and a second protrusion protruding toward the third plate. The thickness of the top of the first protrusion is defined as h1, and the thickness of the top of the second protrusion is defined as h2, wherein h1 is less than h2. The heat exchanger of the present application increases the flow area of the second heat exchange channel, reduces the flow pressure drop of the heat exchange fluid, and improves the heat exchange between the heat exchange fluid and the refrigerant by adjusting the thickness of the first protrusion to be less than the thickness of the second protrusion.

Description

Technical Field

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

[0002] The heat exchanger in the related art includes a heat exchange plate, which has protrusions to increase the contact area between the heat exchange plate and the heat exchange fluid and to disturb the heat exchange fluid to improve the heat exchange performance. For compact plate heat exchangers, especially for applications such as high-efficiency refrigeration equipment in vehicles, the flow channel size of the heat exchanger is significantly reduced, from the traditional 3-5mm equivalent flow diameter to less than 3mm, or even less than 2mm. In such a scenario, higher requirements are placed on the manufacturing accuracy of the heat exchange plate, especially the plate mold and stamping technology, brazing technology, etc., which are significantly more technically difficult than related applications in traditional industries. Heat exchange plates are usually manufactured using full-profile mold technology, that is, the mold is completely profiled according to the structure of the heat exchange plate. However, during the processing, due to the thinning of the material of the heat exchange plate, the shape of the mold core is usually not in full contact with the surface of the heat exchange plate, resulting in a difference between the structure of the final formed heat exchange plate and the structure of the heat exchange plate to be formed. The unstable flow channel structure between adjacent heat exchange plates affects the heat exchange performance of the heat exchanger and is prone to cause cold welding of the flow channel welds, affecting the structural reliability of the heat exchanger. How to convert the material thinning of the heat exchange plate into an improvement in the heat exchange performance of the heat exchanger is an urgent problem that needs to be solved. Summary of the Invention

[0003] The purpose of this application is to provide a heat exchanger that increases the flow area of the second heat exchange channel, reduces the flow pressure drop of the heat exchange fluid, and thus improves the heat exchange performance of the heat exchanger.

[0004] An embodiment of the present application provides a heat exchanger, comprising a plurality of heat exchange plates, wherein the heat exchange plates include a first plate, a second plate, and a third plate; a first heat exchange channel is provided between the first plate and the second plate, a second heat exchange channel is provided between the second plate and the third plate, the flow area of a single second heat exchange channel is greater than the flow area of a single first heat exchange channel, the second plate has a first protrusion protruding toward the first plate and a second protrusion protruding toward the third plate, the thickness of the top of the first protrusion is defined as h1, and the thickness of the top of the second protrusion is defined as h2, wherein h1 is less than h2.

[0005] The present application controls the thickness of the top of the first protrusion to be smaller than the thickness of the top of the second protrusion, and distributes the material thinning area of the heat exchange plate on the top of the first protrusion, so that the space where the material of the heat exchange plate is thinned is used as part of the second heat exchange channel to increase the flow area of the second heat exchange channel. The thickness of the top of the second protrusion is larger than the thickness of the top of the first protrusion, and the flow area of the first heat exchange channel is not increased compared with the flow area of the second heat exchange channel. Since the first heat exchange channel is for the circulation of refrigerant and the second heat exchange channel is for the circulation of heat exchange fluid, the second heat exchange channel with a larger flow area can reduce the pressure drop of the heat exchange fluid, so that the heat exchange fluid after heat exchange with the refrigerant in the first heat exchange channel can flow through the second heat exchange channel faster, thereby improving the heat exchange effect between the heat exchange fluid and the refrigerant, and thus improving the heat exchange performance of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 This is a schematic diagram of a three-dimensional structure of the heat exchanger of the present application;

[0007] Figure 2 This is a structural diagram of the fluid channel of the heat exchanger of the present application;

[0008] Figure 3 This is a schematic structural diagram of another fluid channel of the heat exchanger of the present application;

[0009] Figure 4 This is a structural diagram of another fluid channel of the heat exchanger of the present application;

[0010] Figure 5 This is a schematic structural diagram of another fluid channel of the heat exchanger of the present application;

[0011] Figure 6 yes Figure 5 Schematic diagram of a local enlarged structure;

[0012] Figure 7 This is a reference diagram for the distribution of the heat exchange area and corner hole area of the heat exchange plate of the heat exchanger of the present application;

[0013] Figure 8 This is a structural diagram of the heat exchange plate of the heat exchanger of the present application;

[0014] Figure 9 yes Figure 8 A schematic diagram of a partial cross-sectional structure of the middle heat exchange plate along the AA direction;

[0015] Figure 10 This is an enlarged structural comparison diagram of the first protrusion and the eighth protrusion of the heat exchanger of the present application;

[0016] Figure 11 This is another structural schematic diagram of the heat exchange plate of the heat exchanger of the present application;

[0017] Figure 12 yes Figure 11 Schematic diagram of the enlarged structure at A in the middle;

[0018] Figure 13 yes Figure 11 A schematic diagram of a partial cross-sectional structure of the middle heat exchange plate along the BB direction;

[0019] Figure 14 This is a partial cross-sectional structural schematic diagram of another structure of the second plate of the heat exchanger of the present application;

[0020] Figure 15 This is another enlarged structural comparison diagram of the first protrusion and the eighth protrusion of the heat exchanger of the present application. DETAILED DESCRIPTION

[0021] See also Figure 1-15 The embodiment of the present application provides a heat exchanger 1, comprising a plurality of heat exchange plates 10, wherein fluid channels are provided between adjacent heat exchange plates 10, and other components such as fins may be provided in the fluid channels. The heat exchanger 1 is further provided with a pipe 40 communicating with the fluid channels, such as Figure 2-Figure 6 As shown, the heat exchange plate 10 includes a first plate 11, a second plate 12 and a third plate 13, a first heat exchange channel 20 is provided between the first plate 11 and the second plate 12, and a second heat exchange channel 30 is provided between the second plate 12 and the third plate 13, wherein the first heat exchange channel 20 and the second heat exchange channel 30 are not connected, and the first heat exchange channel 20 and the second heat exchange channel 30 are for different media to circulate, specifically, the first heat exchange channel 20 is for refrigerant to circulate, and the second heat exchange channel 30 is for heat exchange fluid to circulate, since the first heat exchange channel 20 and the second heat exchange channel 30 are located on both sides of the second plate 12, the refrigerant in the first heat exchange channel 20 and the heat exchange fluid in the second heat exchange channel 30 can achieve heat exchange through the second plate 12; wherein the heat exchange fluid is mainly a coolant, specifically cooling water or cooling oil.

[0022] In order to increase the heat exchange effect of the heat exchanger, the second plate 12 usually has protrusions or grooves to increase the contact area or turbulence effect between the second plate 12 and the refrigerant or heat exchange fluid, such as Figure 2-Figure 4As shown, the second plate 12 has a first protrusion 121 protruding toward the first plate 11 and a second protrusion 123 protruding toward the third plate 13, that is, the first protrusion 121 and the second protrusion 123 are located on both sides of the second plate, and the thickness of the top of the first protrusion 121 is defined as h1, and the thickness of the top of the second protrusion 123 is defined as h2, wherein h1 is smaller than h2. Since the shape of the protrusion area corresponding to the heat exchange plate 10 is large during the processing of the heat exchange plate 10, there is usually a phenomenon of material thinning, and the thickness of the top of the first protrusion 121 is controlled to be smaller than the thickness of the top of the second protrusion 123, and the material thinning area of the heat exchange plate 10 is distributed at the top of the first protrusion 121, so that the space where the material of the heat exchange plate 10 is thinned is used as part of the second heat exchange channel 30 to increase the flow area of the second heat exchange channel 30, and the thickness of the top of the second protrusion 123 is greater than that of the first protrusion. The top of 121 is thicker, and the flow area of the first heat exchange channel 20 is smaller than that of the second heat exchange channel 30. Since the first heat exchange channel 20 is for refrigerant circulation and the second heat exchange channel 30 is for heat exchange fluid circulation, the second heat exchange channel 30 with a larger flow area can reduce the pressure drop of the heat exchange fluid, allowing the heat exchange fluid after exchanging heat with the refrigerant in the first heat exchange channel 20 to flow through the second heat exchange channel 30 more quickly, thereby improving the heat exchange effect between the heat exchange fluid and the refrigerant, and thus improving the heat exchange performance of the heat exchanger 1. In addition, the flow area on the refrigerant side is smaller than that on the heat exchange fluid side, the first heat exchange channel is more compact, and the thickness of the top of the second protrusion is thicker, which improves the pressure bearing capacity of the first heat exchange channel.

[0023] like Figure 4 、 Figure 6As shown, the first plate 11 has a third protrusion 111 protruding toward the second plate 12, and the third protrusion 111 is arranged opposite to the first protrusion 121. The thickness of the top of the third protrusion 111 is defined as h3, wherein h3 is less than h2, thereby increasing the flow area of the second heat exchange channel 30 on the other side of the first plate 11. Moreover, the first plate 11 and the second plate 12 can be symmetrical structures, that is, after the first plate 11 is flipped 180 degrees, its protrusion structure is the same as the protrusion structure of the second plate 12. At this time, the first protrusion The thickness of the top of 121 can be the same as the thickness of the top of the third protrusion 111, which simplifies the manufacturing of the heat exchange plate 10. Of course, the first plate 11 and the second plate 12 may not be symmetrical structures. As long as the material thinning area of the first plate 11 is distributed on the top of the third protrusion 111, the material thinning during the processing of the heat exchange plate 10 can also be converted into increasing the flow area of the second heat exchange channel 30 on the other side of the first plate 11, thereby reducing the pressure drop of the second heat exchange channel 30 and improving the heat exchange performance of the heat exchanger 1. The third plate 13 has a fourth protrusion 131 protruding toward the second plate 12. The fourth protrusion 131 is arranged opposite to the second protrusion 123. The thickness of the top of the fourth protrusion 131 is defined as h4, where h4 is greater than h1. Similarly, the second plate 12 and the third plate 13 can also be symmetrical structures. In this case, the thickness of the top of the second protrusion 123 can be the same as the thickness of the top of the fourth protrusion 131, which simplifies the manufacturing process of the heat exchange plate 10. Figure 5 As shown, the third plate 13 has a sixth protrusion 132 protruding away from the second plate 12, and the thickness of the sixth protrusion 132 is less than the thickness of the fourth protrusion 131, so that the thickness of the protrusion tops of the heat exchange plates located on both sides of the second heat exchange channel 30 is less than the thickness of the protrusion tops of the heat exchange plates located on both sides of the first heat exchange channel 20, thereby further increasing the flow area of the second heat exchange channel 30 relative to the first heat exchange channel 20. It should be pointed out that when the first plate 11 and the third plate 13 have the same structure, the sixth protrusion 131 of the third plate 13 is the third protrusion 111 of the first plate 11.

[0024] like Figure 2 、 Figure 3 As shown, the width difference between the first protrusion 121 and the second protrusion 123 of the second plate 12 is small, or the same within the manufacturing process error range, and the flow area of the second heat exchange channel 30 is larger than the flow area of the first heat exchange channel 20 only by controlling the thickness of the top of the first protrusion 121 and the thickness of the top of the second protrusion 123. In some application environments, it is necessary to further increase the flow area of the second heat exchange channel 30 to improve the heat exchange effect of the heat exchanger, such as Figure 4As shown, the width a of the first protrusion 121 is made greater than the width b of the second protrusion 123 , so that the flow area of the second heat exchange channel 30 is further increased compared with the flow area of the first heat exchange channel 20 , thereby achieving different heat exchange requirements. It should be pointed out here that the adjustment of the flow area of the heat exchange channel is mainly achieved by adjusting the shape of the first protrusion 121 and the second protrusion 123, and the thickness relationship between the top of the first protrusion 121 and the top of the second protrusion 123 is mainly achieved by utilizing the material thinning phenomenon that occurs during the processing of the heat exchange plate 10. By controlling the distribution of the material thinning area, the material thinning of the heat exchange plate 10 is converted into an improvement in the heat exchange performance of the heat exchanger 1. In applications where the flow area of the first heat exchange channel 20 and the second heat exchange channel 30 is large, the effect of improving the heat exchange performance of the heat exchanger 1 by controlling the distribution of the material thinning area is relatively limited. However, for applications where the flow area of the first heat exchange channel 20 and the second heat exchange channel 30 is small, for example, when cooling water flows through the second heat exchange channel 20, when the equivalent flow diameter of the second heat exchange channel is reduced to below 4 mm, the heat exchange performance of the heat exchanger 1 is significantly improved by controlling the distribution of the material thinning area of the heat exchange plate 10. The equivalent flow diameter here refers to the diameter when the shape of the flow channel is equivalent to a circle.

[0025] In some specific embodiments, in order to further increase the flow area of the second heat exchange channel 30 to improve the heat exchange effect of the heat exchanger 1, the heat exchange plate 10 can adopt an asymmetric convex structure, that is, the convex structures on both sides of the heat exchange plate 10 are different, such as Figure 5 、 Figure 6 As shown, the first plate 11 and the second plate 12 are symmetrical structures. Here, the symmetrical structure means that at least part of the cross section of the heat exchange plate along its stacking direction is a symmetrical structure, for example Figure 5 The first plate and the second plate in the heat exchanger 10 may be the first plate 11 flipped 180° and its convex structure is the same as the convex structure of the second plate 12. In addition, the heat exchange plate 10 usually has a corner hole. The corner holes of the first plate 11 and the second plate 12 may be symmetrical structures or other different structures. Here, the convex structure of the heat exchange plate is mainly limited, and the corner hole structure is not limited. The structure of the third plate 13 may be the same as that of the first plate 11, that is, the heat exchanger 1 includes the first plate 11 and the second plate 12 arranged alternately. Figure 5The first plate below the second plate is shown as the third plate, the second plate 12 has a first protrusion 121 protruding toward the first plate 11 and a second protrusion 123 protruding toward the third plate 13, the first plate 11 has a third protrusion 111 protruding toward the second plate 12, the third plate 13 has a fourth protrusion 131 protruding toward the second plate 12, and the second plate 12 further has a fifth protrusion 125 protruding toward the third plate 11, the fifth protrusion 125 is located between at least part of the adjacent first protrusions 121, and the fifth protrusion 125 is relative to the first protrusion 121. The height of the top of the first protrusion 121 is less than the height of the second protrusion 123 relative to the top of the first protrusion 121. The third plate 13 has a sixth protrusion 132 protruding away from the second plate 12. The sixth protrusion 132 is arranged corresponding to the first protrusion 121. A seventh protrusion 133 protruding toward the second plate 12 is further provided between at least some adjacent sixth protrusions 132. The seventh protrusion 133 is arranged corresponding to the fifth protrusion 125. The height of the seventh protrusion 133 relative to the top of the sixth protrusion 132 is less than the height of the fourth protrusion 131 relative to the top of the sixth protrusion 132. The first protrusion 121 of the second plate 12 is welded to the third protrusion 111 of the first plate 11, and the fourth protrusion 131 of the third plate 13 is welded to the second protrusion 123 of the second plate 12. There is a gap between the fifth protrusion 125 of the second plate 12 and the seventh protrusion 133 of the third plate 13. The welding positions of the first protrusion 121 and the third protrusion 111 in the first heat exchange channel 20 are denser than the welding positions of the fourth protrusion 131 and the second protrusion 123 in the second heat exchange channel 30, thereby increasing the first heat exchange channel 20. 0's pressure bearing capacity and welding strength, the fifth protrusion 125 and the seventh protrusion 133 do not contact each other, so as to increase the flow area of the second heat exchange channel 30, and the thickness of the top of the fifth protrusion 125 is greater than the thickness of the top of the first protrusion 121, and the thickness of the top of the sixth protrusion 132 is less than the thickness of the top of the seventh protrusion 133. The material thinning area of the heat exchange plate 10 is distributed on one side of the second heat exchange channel 30, which further increases the flow area of the second heat exchange channel 30, reduces the flow resistance of the heat exchange fluid in the second heat exchange channel 30, and improves the heat exchange performance of the heat exchanger 1.

[0026] The present application makes the thickness of the top of the first protrusion 121 smaller than the thickness of the top of the second protrusion 123, and reasonably utilizes the material thinning distribution of the heat exchange plate 10 and the molding characteristics of the heat exchange plate 10, so as to well realize the coordination of the heat exchange channel of the heat exchanger 1 and improve the welding quality and structural reliability of the product. Specifically, the flow area of the first heat exchange channel 20 on the refrigerant side is smaller than the flow area of the second heat exchange channel 30 on the heat exchange fluid side. The first heat exchange channel 20 has a high pressure drop, a compact flow channel, a high refrigerant charge, and good pressure bearing capacity and strength. The flow area of the second heat exchange channel 30 on the heat exchange fluid side is relatively large, the pressure drop is low, and the system pump power consumption is low, thereby increasing the heat transfer coefficient on the refrigerant side. By readjusting the heat transfer coefficients on the refrigerant side and the heat exchange fluid side, the overall heat exchange performance of the heat exchanger 1 under a lower heat exchange fluid pressure drop is further improved.

[0027] like Figure 3 、 Figure 6 As shown, a first groove 122 is formed on the back of the first protrusion 121 of the second plate 12, and a second groove 124 is formed on the back of the second protrusion 123 of the second plate 12. The depth of the first groove 122 relative to the top of the second protrusion 123 is defined as H1, and the depth of the second groove 124 relative to the top of the first protrusion 121 is defined as H2, wherein H1 is greater than H2. Since the first groove 122 forms a part of the second heat exchange channel 30 and the second groove 124 forms a part of the first heat exchange channel 20, the second heat exchange channel is realized by controlling the depth of the first groove 122 on the back of the first protrusion 121 to be greater than the depth of the second groove 124 on the back of the second protrusion 123. The flow area of 30 is greater than the flow area of the first heat exchange channel 20. In addition, since the thickness of the top of the first protrusion 121 is less than the thickness of the top of the second protrusion 123, the depth of the first groove 122 is greater than the depth of the second groove 124, so that the thickness of the top of the first protrusion 121 is compensated by the depth of the first groove 122, so that the sum of the depth of the first groove 122 and the thickness of the top of the first protrusion 121 and the sum of the depth of the second groove 124 and the thickness of the top of the second protrusion 123 are smaller, so that the flatness of the heat exchange plate 10 is better, the structural differences of the processed heat exchange plates are reduced, the assembly effect of the heat exchange plates 10 is ensured, and the number of cold welds at the welds between the heat exchange plates 10 is reduced.

[0028] In some specific embodiments, the thickness h1 of the top of the first protrusion 121, the thickness h2 of the top of the second protrusion 123, the depth H1 of the first groove 122 relative to the top of the second protrusion 123, and the depth H2 of the second groove 124 relative to the top of the first protrusion 121 satisfy the following relationship: -0.15 mm ≤ (h1 + H1) - (h2 + H2) ≤ 0.15 mm. Since the height difference of the top of each protrusion can be compensated by filling with solder when welding the heat exchange plate 10, such as the height difference of the tops of multiple first protrusions 121 or the height difference of the tops of multiple second protrusions 123, by satisfying the above relationship, the height difference of the first protrusion 121 of the second plate 12 is reduced. 1 and the top of the third protrusion 111 of the first plate 11, and reduce the false welding between the top of the second protrusion 123 of the second plate 12 and the top of the fourth protrusion 131 of the third plate 13. Of course, the height difference between the tops of the third protrusions 111 of the first plate 11 and the height difference between the tops of the fourth protrusions 131 of the third plate 13 will also affect the welding quality between the tops of the first protrusion 121 and the third protrusions 111, as well as the welding quality between the tops of the second protrusion 123 and the fourth protrusion 131. Setting -0.05mm≤(h1+H1)-(h2+H2)≤0.05mm can further ensure the welding quality between the heat exchange plates 10.

[0029] In some embodiments, as Figure 7 、 Figure 8 、 Figure 11As shown, the heat exchange plate 10 includes a first corner hole area 120, a second corner hole area 130 and a heat exchange area 140. Along the length direction of the heat exchange plate 10, the heat exchange plate 10 includes a first end and a second end. The first corner hole area 120 is close to the first end of the heat exchange plate 10, and the second corner hole area 130 is close to the second end of the heat exchange plate 10. The heat exchange area 140 is located between the first corner hole area 120 and the second corner hole area 130, wherein the first protrusion 121 and the second protrusion 123 are provided in the heat exchange area 140, and the heat exchange plate 10 has an eighth protrusion 126 located in the first corner hole area 120 and / or the second corner hole area 130, wherein the thickness of the top of the eighth protrusion 126 is greater than the thickness of the top of the first protrusion 121. Since the first protrusion 121 and the second protrusion 123 are located in the heat exchange area 140, in order to ensure the heat exchange performance of the heat exchange area 140, a more delicate heat exchange space and protrusion structure are provided through superior material stretching and molding design, thereby increasing the heat exchange area of the refrigerant in the first heat exchange channel 20 and the heat exchange fluid in the second heat exchange channel 30. On the other hand, part of the eighth protrusion 126 is located in the first corner hole area 120 and / or the second corner hole area 130, which meets the distribution of the fluid in the first corner hole area 120 and the second corner hole area 130, and ensures the wall thickness of this fluid channel and the strength of the structure after welding. Therefore, the thickness of the top of the first protrusion 131 located in the heat exchange area 140 is greater than the thickness of the top of the eighth protrusion 126 located in the first corner hole area 120 and / or the second corner hole area 130, which can better achieve the heat exchange performance of the heat exchange area 140 and the fluid distribution and structural strength of the corner hole area.

[0030] In some specific embodiments, Figure 7 、 Figure 8 、 Figure 11 As shown, the first corner hole area 120 and the second corner hole area 130 have multiple corner holes, wherein, along the width direction of the heat exchange plate 10, the first corner hole area 120 has a first corner hole 51 and a second corner hole 52, and the second corner hole area 130 has a third corner hole 53 and a fourth corner hole 54, wherein the first corner hole 51 and the third corner hole 53 are located on the same side of the heat exchange plate 10, and the second corner hole 52 and the fourth corner hole 54 are located on the other side of the heat exchange plate 10, and the heat exchange plate 10 has a portion of the eighth protrusion 126 located between the first corner hole 51 and the second corner hole 52, and the heat exchange plate 10 has a portion of the eighth protrusion 126 located between the third corner hole 53 and the fourth corner hole 54, wherein the eighth protrusion 126 can be provided in only one of the corner hole areas, or the eighth protrusion 126 can be provided in both corner hole areas.

[0031] In some specific embodiments, Figure 9 、 Figure 10As shown, the protruding direction of the eighth protrusion 126 is the same as that of the first protrusion 121, the back side of the eighth protrusion 126 forms an eighth groove 127, and the back side of the first protrusion 121 forms a first groove 122. The depth of the first groove 122 relative to the substrate 100 is defined as H1, the depth of the eighth groove 127 relative to the substrate 100 is defined as Dp1, and the maximum thickness of the heat exchange plate 10 is defined as H. The maximum thickness of the heat exchange plate referred to here refers to the thickness of the substrate 100 of the heat exchange plate. The substrate 100 here refers to the part of the heat exchange plate without protrusions or grooves, which can be the flat part around the corner hole of the heat exchange plate, or the flat part between adjacent protrusions or grooves, wherein Dp1

[0032] In some specific embodiments, Figure 15 As shown, the protruding direction of the eighth protrusion 126 is the same as the protruding direction of the second protrusion 123, and opposite to the protruding direction of the first protrusion 121. An eighth groove 127 is formed on the back of the eighth protrusion 126, and a second groove 127 is formed on the back of the second protrusion 123. The depth of the second groove 127 relative to the top of the first protrusion 121 is defined as H2, and the depth of the eighth groove 127 is defined as Dp2, wherein Dp2<H2<Dp2+1.5H. Since the thickness of the heat exchange plate 10 directly affects the degree of material thinning at the top of the protrusion, the depths of the second groove 124 and the eighth groove 127 are reasonably adjusted according to the thickness of the heat exchange plate 10, thereby reducing the height difference between the top of the second protrusion 123 and the top of the eighth protrusion 126, and improving the flatness of the heat exchange plate 10. Since the depth of the first groove 122 is greater than the depth of the second groove 124, the depth difference between the second groove 124 and the eighth groove 127 is less than the depth difference between the first groove 122 and the eighth groove 127.

[0033] ​In some specific embodiments, the heat exchange plate 10 further has a plurality of protrusions and bosses, which are located in the first corner hole area 120 and / or the second corner hole area 130. Figure 7 As shown, the heat exchange plate 10 has a first protrusion 61 and a first boss portion 62 located in the first corner hole area 120, the first boss portion 62 is arranged around the edge of the second corner hole 52, the second corner hole 52 passes through the top of the first boss portion 62, the first protrusion 61 is located at the outer periphery of the first corner hole 51, and the first protrusion 61 and the first corner hole 51 have a predetermined distance, the heat exchange plate 10 has a second protrusion 63 and a second boss portion 64 located in the second corner hole area 130, the second boss portion 64 is arranged around the edge of the fourth corner hole 54, the fourth corner hole 54 passes through the top of the second boss portion 64, the second protrusion 63 is located at the outer periphery of the third corner hole 53, and the second protrusion 63 and the third corner hole 53 have a predetermined distance. The first and second protrusions and the first and second bosses are primarily provided to ensure structural reliability after welding adjacent heat exchange plates 10 and to maintain the distance between adjacent heat exchange plates 10. Furthermore, the first and second bosses facilitate sealing between some of the corner holes. Of course, the first corner hole 51 and the fourth corner hole 54 can be located on the same side of the heat exchange plate 10, while the second corner hole 52 and the third corner hole 53 can be located on the other side of the heat exchange plate 10, thereby achieving diagonal flow of the heat exchange fluid, i.e., the inlet and outlet of the fluid channel are located on different sides of the heat exchange plate 10.

[0034] like Figures 8-15 As shown, the first protrusion 121 and the second protrusion 123 are both corrugated protrusions, the back of the first protrusion 121 forms a first groove 122, the back of the second protrusion 123 forms a second groove 124, the first groove 122 and the second groove 124 are both corrugated grooves, multiple corrugated protrusions are arranged along the length direction of the heat exchange plate 10, there is a corrugated groove between two adjacent corrugated protrusions, the corrugated protrusion includes multiple extension sections 1211, two adjacent extension sections 1211 are set at an angle, and the extension sections 1211 are inclined relative to the length direction of the heat exchange plate. Specifically, as Figure 8 、 Figure 9As shown, the first protrusion 121 is a single herringbone wave. A single herringbone wave means that the first protrusion 121 includes two extended sections 1211 arranged at an angle. Each extended section 1211 is inclined relative to the length direction of the heat exchange plate 10. The two extended sections 1211 can be symmetrically arranged along the width direction of the heat exchange plate 10, or they can be asymmetrically arranged. Some extended sections 1211 can also extend along the length direction of the heat exchange plate 10. Some of the eighth protrusions 126 can be corrugated protrusions, and some of the eighth protrusions 126 can be long strip protrusions. It is understood that the eighth protrusion 126 can also adopt other structures. In addition to being closer to the two ends of the heat exchange plate 10 relative to the first protrusion 121, the first protrusion 121 and the eighth protrusion 126 can also be arranged on both sides of the width direction of the heat exchange plate 10, or at both ends of the length direction. The distribution of the first protrusion 121 and the eighth protrusion 126 can be adjusted according to the specific application requirements of the heat exchange plate 10.

[0035] In some embodiments, as Figure 11-Figure 15 As shown, the first protrusion 121 and the second protrusion 123 are both corrugated protrusions. Specifically, the first protrusion 121 is a multiple herringbone wave. The multiple herringbone wave means that the first protrusion 121 includes multiple extension sections 1211 arranged at an angle. Each extension section 1211 is inclined relative to the length direction of the heat exchange plate 10, and the number of extension sections 1211 is greater than two. Figure 12 、 Figure 13 As shown, the second plate 12 also has a fifth protrusion 125 protruding away from the first plate 11, and the fifth protrusion 125 is a corrugated protrusion. The height of the fifth protrusion 125 relative to the top of the first protrusion 121 is less than the height of the second protrusion 123 relative to the top of the first protrusion 121. The fifth protrusion 125 is located between at least part of the adjacent first grooves 122, and the first groove 122 is located between the fifth protrusion 125 and the second protrusion 123. Through the arrangement of the fifth protrusion 125, the asymmetric structure of the heat exchange plate 10 is realized, that is, adjacent fluid channels have different flow areas, and different turbulence effects of the fluid channels are realized, and the heat exchange performance of the heat exchanger is improved through a more complex protrusion structure.

[0036] like Figure 9 、 Figure 10As shown, the maximum width of the orthographic projection of the first groove 122 on the plane where the substrate 100 is located is λ1, the maximum width of the orthographic projection of the eighth groove 127 on the plane where the substrate 100 is located is λ2, the depth of the first groove 122 is H1, and the depth of the eighth groove 127 is Dp1, wherein λ1 / H1<λ2 / DP1, and H1>DP1. When both the corner hole area and the heat exchange area 140 of the heat exchange plate 10 have protrusions, that is, the heat exchange area 140 of the heat exchange plate 10 has the first protrusion 121, the corner hole area of the heat exchange plate 10 has the eighth protrusion 126, and the first protrusion 121 and the eighth protrusion 126 satisfy λ1 / H1<λ2 / DP1, at this time, the maximum width of the orthographic projection of the first groove 122 on the back side of the first protrusion 121 on the plane where the substrate 100 is located is less than the maximum width of the orthographic projection of the eighth groove 127 on the back side of the eighth protrusion 126 on the plane where the substrate 100 is located, or the depth of the first groove 122 is greater than the depth of the eighth groove 127, and the deformation of the heat exchange plate 10 in the area where the first protrusion 121 is located is greater than The deformation of the heat exchange plate 10 in the area where the eighth protrusion 126 is located can easily lead to a greater degree of material thinning at the top of the first protrusion 121 than at the top of the eighth protrusion 126, that is, the thickness of the top of the first protrusion 121 is less than the thickness of the top of the eighth protrusion 126, which can easily lead to the top of the first protrusion 121 being lower than the top of the eighth protrusion 126. By increasing the depth H1 of the first groove 122, that is, the depth H1 of the first groove 122 is greater than the depth DP1 of the eighth groove 127, the thinning amount of the top of the first protrusion 121 is compensated by the depth of the first groove 122, and the height difference between the top of the first protrusion 121 and the top of the eighth protrusion 126 is reduced, thereby reducing the cold welding of the heat exchanger 1. In addition, this parameter relationship between the first protrusion 121 and the eighth protrusion 126 enables the heat exchanger 1 to have a more superior heat exchange performance, but in manufacturing, it is also necessary to combine the structural molding characteristics of the heat exchange plate 10 to design, and convert the differences in material molding into a structure of the heat exchange plate 10 that is beneficial to the heat exchange performance, while conforming to the heat exchange requirements and manufacturing characteristics of the heat exchanger 1.

[0037] In some specific embodiments, the heat exchange plate 10 is made of aluminum alloy plate, the thickness H of the substrate 100 is generally around 0.4-0.5 mm, the maximum width λ1 of the orthographic projection of the first groove 122 on the plane where the substrate 100 is located and the depth H1 of the first groove 122 satisfy: 2.5≤λ1 / H1≤5, the maximum width λ2 of the orthographic projection of the eighth groove 127 on the plane where the substrate 100 is located and the depth Dp1 of the eighth groove 127 satisfy: 3.5≤λ2 / DP1≤7, so that the area where the first protrusion 121 is located has good heat exchange performance, and the top of the eighth protrusion has sufficient thickness to ensure the strength of the heat exchange plate 10. Specifically, first protrusion 121 meets the technical requirement of 2.5≤λ1 / H1≤5, prioritizing the product's heat exchange performance in the corresponding area. For example, positioning first protrusion 121 in heat exchange zone 140 prioritizes heat exchange performance in heat exchange zone 140. This means that superior material stretching design achieved through the first protrusion provides more heat exchange area and a more refined heat exchange space and structure. On the other hand, eighth protrusion 126 meets the technical requirement of 3.5≤λ2 / DP1≤7, balancing product heat exchange performance and reliability in the corresponding area. For example, positioning the eighth protrusion in the corner hole area ensures proper material stretching, while meeting the flow and heat exchange requirements of the corresponding area while ensuring the wall thickness of the fluid channel and the strength of the post-weld structure. Furthermore, within this area, fluid distribution is prioritized within the overall product's structural functionality, a factor favored by the technical requirement of 3.5≤λ2 / DP1≤7.

[0038] By providing the first protrusion 121 and the eighth protrusion 126 on the heat exchange plate 10, and ensuring that the first protrusion 121 and the eighth protrusion 126 conform to the aforementioned parameter relationship, the heat exchanger 1 achieves superior heat exchange performance and a reliable structure. On the one hand, in the heat exchange region 140, the fluid channel corresponding to the second side surface of the substrate 100 will have a denser and more uniform solder joint arrangement, enhancing the heat exchange effect and improving the fluid channel structure, making it particularly suitable for applications primarily using refrigerants. The first protrusion 121 and the eighth protrusion 126 conforming to the aforementioned parameter relationship will further facilitate uniform material forming. Logically, superior heat exchange performance requires greater material thinning. This requires ensuring uniform forming of the heat exchange plate 10 during processing, minimizing the difference in maximum thinning between different areas, and avoiding local "shortcomings" in the product structure. This application, after effectively exploring the product's heat exchange performance and material forming characteristics, and on the premise of meeting technical requirements, seeks to identify "commonly beneficial areas" for heat exchange performance and product strength. On the other hand, the two ends of the heat exchange plate 10 are key positions for the strength and distribution of the heat exchanger 1. The corner hole area of the present application prioritizes strength and distribution, while taking into account superior heat exchange performance and reliable product structure.

[0039] The heat exchanger provided by the present invention has been described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above examples is intended only to facilitate understanding of the core concepts of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. A heat exchanger comprising a plurality of heat exchange plates, wherein the heat exchange plates include a first plate, a second plate, and a third plate, a first heat exchange channel is defined between the first plate and the second plate, and a second heat exchange channel is defined between the second plate and the third plate, wherein: The flow area of the second heat exchange channel is larger than the flow area of the first heat exchange channel. The first heat exchange channel is for the circulation of refrigerant, and the second heat exchange channel is for the circulation of heat exchange fluid. The second plate has a first protrusion protruding toward the first plate and a second protrusion protruding toward the third plate. The thickness of the top of the first protrusion is defined as h1, and the thickness of the top of the second protrusion is defined as h2, wherein h1 is less than h2. A first groove is formed on the back side of the first protrusion of the second plate, and a second groove is formed on the back side of the second protrusion of the second plate. The depth of the first groove relative to the top of the second protrusion is defined as H1, and the depth of the second groove relative to the top of the first protrusion is defined as H2, wherein H1 is greater than H2.

2. The heat exchanger according to claim 1, characterized in that The thickness h1 of the top of the first protrusion, the thickness h2 of the top of the second protrusion, the depth H1 of the first groove relative to the top of the second protrusion, and the depth H2 of the second groove relative to the top of the first protrusion satisfy: -0.15mm≤(h1+H1)-(h2+H2)≤0.15mm.

3. The heat exchanger according to claim 1, characterized in that The first plate has a third protrusion protruding toward the second plate, the third protrusion is arranged opposite to the first protrusion, and the thickness of the top of the third protrusion is defined as h3, wherein h3 is less than h2; The third plate has a fourth protrusion protruding toward the second plate. The fourth protrusion is arranged opposite to the second protrusion. The thickness of the top of the fourth protrusion is defined as h4, wherein h4 is greater than h1.

4. The heat exchanger according to claim 3, characterized in that The second plate further has a fifth protrusion protruding toward the third plate, the fifth protrusion being located between at least a portion of the adjacent first protrusions, the height of the fifth protrusion relative to the top of the first protrusion being less than the height of the second protrusion relative to the top of the first protrusion, and the thickness of the top of the fifth protrusion being greater than the thickness of the top of the first protrusion; The third plate has a sixth protrusion protruding away from the second plate, and the sixth protrusion is arranged corresponding to the first protrusion. There is also a seventh protrusion protruding toward the second plate between at least some adjacent sixth protrusions, and the seventh protrusion is arranged corresponding to the fifth protrusion. The height of the seventh protrusion relative to the top of the sixth protrusion is less than the height of the fourth protrusion relative to the top of the sixth protrusion, and the thickness of the top of the sixth protrusion is less than the thickness of the top of the seventh protrusion.

5. The heat exchanger according to claim 4, characterized in that The first plate and the third plate are heat exchange plates with the same structure. The first plate and the second plate are arranged alternately. The top of the first protrusion of the second plate is welded and fixed to the top of the third protrusion of the adjacent first plate. The top of the second protrusion of the second plate is welded and fixed to the fourth protrusion of the adjacent third plate. The flow area of the first heat exchange channel is smaller than the flow area of the second heat exchange channel.

6. The heat exchanger according to any one of claims 1 to 5, characterized in that: The second plate includes a first corner hole area, a second corner hole area and a heat exchange area. Along the length direction of the heat exchange plate, the heat exchange plate includes a first end and a second end. The first corner hole area is close to the first end of the heat exchange plate, and the second corner hole area is close to the second end of the heat exchange plate. The heat exchange area is located between the first corner hole area and the second corner hole area. The first protrusion and the second protrusion are arranged in the heat exchange area. The heat exchange plate also has an eighth protrusion, which is arranged in the first corner hole area and / or the second corner hole area. The thickness of the top of the eighth protrusion is greater than the thickness of the top of the first protrusion.

7. The heat exchanger according to claim 6, characterized in that The protruding direction of the eighth protrusion is the same as that of the first protrusion. The back surface of the eighth protrusion forms an eighth groove, and the back surface of the first protrusion forms a first groove. The depth of the first groove relative to the top of the second protrusion is defined as H1, the depth of the eighth groove relative to the top of the second protrusion is defined as Dp1, and the maximum thickness of the heat exchange plate is defined as H, wherein Dp1<H1<Dp1+2.8H; Alternatively, the protruding direction of the eighth protrusion is the same as the protruding direction of the second protrusion, an eighth groove is formed on the back side of the eighth protrusion, and a second groove is formed on the back side of the second protrusion. The depth of the second groove relative to the top of the first protrusion is defined as H2, the depth of the eighth groove relative to the top of the first protrusion is defined as Dp2, and the maximum thickness of the heat exchange plate is defined as H, wherein Dp2<H2<Dp2+1.5H.

8. The heat exchanger according to any one of claims 1 to 5, characterized in that: The first protrusion and the second protrusion are both corrugated protrusions, the back side of the first protrusion forms a first groove, the back side of the second protrusion forms a second groove, the first groove and the second groove are both corrugated grooves, a plurality of the corrugated protrusions are arranged along the length direction of the heat exchange plate, a corrugated groove is provided between two adjacent corrugated protrusions, the corrugated protrusion includes a plurality of extension sections, two adjacent extension sections are arranged at an angle, and the extension sections are inclined relative to the length direction of the second plate.

9. The heat exchanger according to claim 8, characterized in that The second plate also has a fifth protrusion protruding away from the first plate, the fifth protrusion is a corrugated protrusion, the height of the fifth protrusion relative to the top of the first protrusion is less than the height of the second protrusion relative to the top of the first protrusion, the fifth protrusion is located between at least partially adjacent first grooves, and the first groove is located between the fifth protrusion and the second protrusion.

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