Heat exchanger core

Abstract

The utility model provides a heat exchanger core, which relates to the field of heat exchangers and comprises a plurality of inner fin layers and a plurality of outer fin layers. The inner fin layers and the outer fin layers are alternately arranged; the inner fin layer comprises an upper core plate and a lower core plate; a plurality of first protruding parts protruding downwards are arranged on the bottom face of the upper core plate. All the first lug bosses are arranged at intervals; a plurality of second protruding parts protruding upwards are arranged on the top face of the lower core plate. One first lug boss and one second lug boss are oppositely arranged; and the first lug boss is in close contact with the second lug boss. According to the heat exchanger, the problem that the production cost of the heat exchanger is increased due to the fact that too many inner fins are used in the inner fin layer due to the fact that the whole inner fin covers the second partition plate in the inner fin layer in the prior art can be solved, and the production cost of the heat exchanger is reduced.

Description

Technical Field

[0001] This utility model relates to the field of heat exchangers, and more particularly to a heat exchanger core. Background Technology

[0002] A heat exchanger is a device that transfers some of the heat from a hot fluid to a cold fluid.

[0003] For example, Chinese patent application number 202321157014.5 discloses a plate-fin heat exchanger with a long seal-free structure, including a first cover plate, a second cover plate, and multiple sets of alternatingly stacked outer fin layers and inner fin layers located between the first cover plate and the second cover plate; wherein, the inner fin layer includes a first partition plate, a second partition plate, and inner fins located between the first partition plate and the second partition plate, and the two ends of the opposite sides of the first partition plate and the second partition plate are respectively provided with a first boss and a second boss, which are arranged along the length direction of the plate-fin heat exchanger with the long seal-free structure; the heat exchanger provided by the above patent can reduce the manufacturing difficulty of the heat exchanger by reducing two long seals and realize automated assembly.

[0004] However, in the production of the above heat exchanger, the inner fin layer uses a whole piece of inner fin to cover the second partition plate. The excessive use of inner fins in the inner fin layer increases the production cost of the heat exchanger. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a heat exchanger core that solves the problem of existing technologies using a single piece of inner fin to cover the second partition plate within the inner fin layer, resulting in excessive use of inner fins and increased production costs for the heat exchanger. This invention aims to reduce the production cost of the heat exchanger.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] The present invention provides a heat exchanger core comprising a plurality of inner fin layers and a plurality of outer fin layers; the inner fin layers and the outer fin layers are alternately arranged;

[0008] The inner fin layer includes an upper core plate and a lower core plate; the bottom surface of the upper core plate is provided with a plurality of downwardly protruding first protrusions; all the first protrusions are spaced apart; the top surface of the lower core plate is provided with a plurality of upwardly protruding second protrusions; one first protrusion and one second protrusion are arranged facing each other; the first protrusion and the second protrusion are in close contact.

[0009] The heat exchanger core provided by this utility model preferably includes an inner fin layer that further comprises a plurality of inner fins; the inner fins are placed horizontally; the inner fins are disposed between the upper core plate and the lower core plate; the top of the inner fins is in close contact with the bottom surface of the upper core plate; the bottom of the inner fins is in close contact with the top surface of the lower core plate; and the inner fins are offset from the first protrusion.

[0010] The heat exchanger core provided by this utility model preferably includes an outer fin layer comprising an outer fin, a left sealing strip, and a right sealing strip; the outer fin is placed horizontally; the outer fin is located between the left sealing strip and the right sealing strip; the inner fin is placed along the left-right flow direction of the medium; the placement direction of the outer fin is perpendicular to the placement direction of the inner fin.

[0011] The top of the outer fin is in close contact with the bottom surface of the lower core plate of the upper inner fin layer; the bottom of the outer fin is in close contact with the top surface of the upper core plate of the lower inner fin layer.

[0012] The top of the left seal is in close contact with the bottom surface of the lower core plate of the upper inner fin layer; the bottom of the left seal is in close contact with the top surface of the upper core plate of the lower inner fin layer.

[0013] The top of the right seal is in close contact with the bottom surface of the lower core plate of the upper inner fin layer; the bottom of the right seal is in close contact with the top surface of the upper core plate of the lower inner fin layer.

[0014] The heat exchanger core provided by this utility model is preferably provided in the following manner: if the top and bottom of the heat exchanger core are both the outer fin layer; the outer fin layer located at the top of the heat exchanger core is designated as the first outer fin layer, and the outer fin layer located at the bottom of the heat exchanger core is designated as the second outer fin layer.

[0015] It also includes an upper partition and a lower partition; the upper partition covers the top of the first outer fin layer; the lower partition covers the bottom of the second outer fin layer;

[0016] The bottom surface of the upper partition is in close contact with the top of the outer fin of the first outer fin layer; the top surface of the lower partition is in close contact with the bottom of the outer fin of the second outer fin layer.

[0017] The bottom surface of the upper partition is in close contact with the top of the left seal of the first outer fin layer; the top surface of the lower partition is in close contact with the bottom of the left seal of the second outer fin layer.

[0018] The bottom surface of the upper partition is in close contact with the top of the right seal of the first outer fin layer; the top surface of the lower partition is in close contact with the bottom of the right seal of the second outer fin layer.

[0019] The heat exchanger core provided by this utility model preferably further includes an upper cover plate and a lower cover plate; the upper cover plate covers the top surface of the upper partition plate; and the lower cover plate covers the bottom surface of the lower partition plate.

[0020] The heat exchanger core provided by this utility model preferably has a groove-shaped first extension on both the front and rear sides of the upper core plate; the first extension is arranged in the left-right direction; the length of the first extension is equal to the length of the upper core plate; the upper core plate and the first extension are integrally formed; the upper bottom surface of the first extension is lower than the upper plate surface of the upper core plate; the lower bottom surface of the first extension is lower than the lower plate surface of the upper core plate.

[0021] The lower core plate has a groove-shaped second extension on both its front and rear sides; the bottom of the groove of the second extension faces upward; the second extension is arranged in the left-right direction; the length of the second extension is equal to the length of the lower core plate; the lower core plate and the second extension are integrally formed; the upper surface of the second extension is higher than the upper surface of the lower core plate; the lower surface of the second extension is higher than the lower surface of the lower core plate.

[0022] The lower surface of the first extension is in close contact with the upper surface of the second extension.

[0023] The heat exchanger core provided by this utility model preferably has the side closest to the center of the upper core plate as the inner side; the outer sidewall of the first extension extends outward at an angle; the outer sidewall of the second extension extends outward at an angle.

[0024] The inner fin layer further includes a plurality of first inserts and a plurality of second inserts; the first inserts are horizontally arranged; the first inserts are fixed to the upper bottom surface of the first extension; when the first inserts are arranged at the left and right ends of the inner fin layer, the sidewall of the first insert is flush with the sidewall of the upper core plate; the second inserts are horizontally arranged; the second inserts are fixed to the lower surface of the second extension; when the second inserts are arranged at the left and right ends of the inner fin layer, the sidewall of the second insert is flush with the sidewall of the lower core plate.

[0025] The heat exchanger core provided by this utility model preferably has an L-shaped first bend on both the front and rear sides of the upper core plate; the first bend is downwardly oriented; the top of the upper core plate is fixed to the vertical plate of the first bend; the side closest to the center of the upper core plate is designated as the inner side; the horizontal plate of the first bend extends outward; the first bend is oriented in the left-right direction; the length of the first bend is equal to the length of the upper core plate; the upper core plate and the first bend are integrally formed; the upper surface of the horizontal plate of the first bend is lower than the upper surface of the upper core plate; the lower surface of the horizontal plate of the first bend is lower than the lower surface of the upper core plate.

[0026] The lower core plate has L-shaped second bends on both its front and rear sides; the second bends are oriented upwards; the bottom of the lower core plate is fixed to the vertical plate of the second bend; the horizontal plate of the second bend extends outwards; the second bend is oriented in the left-right direction; the length of the second bend is equal to the length of the lower core plate; the lower core plate and the second bend are integrally formed; the upper surface of the horizontal plate of the second bend is higher than the upper surface of the lower core plate; the lower surface of the horizontal plate of the second bend is higher than the lower surface of the lower core plate.

[0027] The lower surface of the horizontal plate of the first bend is in close contact with the upper surface of the horizontal plate of the second bend.

[0028] The heat exchanger core provided by this utility model preferably includes an inner fin layer further comprising a plurality of U-shaped inserts; the vertical cross-section of the U-shaped inserts is U-shaped; the U-shaped inserts are horizontally arranged; the upper sidewall of the U-shaped insert is fixed to the upper plate surface of the horizontal plate of the first bending portion; the lower sidewall of the U-shaped insert is fixed to the lower plate surface of the horizontal plate of the second bending portion; when the U-shaped inserts are arranged at the left and right ends of the inner fin layer, the sidewall of the U-shaped insert is flush with the sidewall of the upper core plate, and the sidewall of the U-shaped insert is flush with the sidewall of the lower core plate.

[0029] The heat exchanger core provided by this utility model is preferably provided in such a way that when the inner fins are disposed at the left and right ends of the inner fin layer, the side of the inner fins is flush with the side of the upper core plate and the side of the inner fins is flush with the side of the lower core plate.

[0030] The above technical solution has the following advantages or beneficial effects:

[0031] The heat exchanger core provided by this utility model includes an inner fin layer comprising an upper core plate and a lower core plate. Existing technology uses a single piece of inner fin between the upper and lower core plates for heat conduction, which is costly. To save on production costs, instead of using inner fins to transfer heat from the heat medium, the lower core plate has several downward-protruding first protrusions on its bottom surface and several upward-protruding second protrusions on its top surface, with each first and second protrusion facing each other. When the heat medium flows through the inner fin layer, heat can be conducted from the first and second protrusions, thus simulating the heat conduction capability of inner fins between the upper and lower core plates. To maintain the stability of the inner fin layer, the upper core plate... The core plate and the lower core plate maintain a stable relative position, and the first and second protrusions can improve the thermal conductivity, ensuring close contact between the first and second protrusions. Furthermore, to prevent the heat medium from clogging within the inner fin layer, all the first protrusions are spaced apart, allowing the heat medium to fully contact the first and second protrusions while flowing, thereby improving the thermal conductivity. Even further, when the heat medium flows through the first and second protrusions within the inner fin layer, the obstruction caused by the first and second protrusions creates turbulence, resulting in the heat medium contacting multiple first and second protrusions within the inner fin layer, increasing the contact area between the heat medium and the heat-conducting medium, thereby improving the heat exchange efficiency. Attached Figure Description

[0032] The present invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings. The drawings are not intentionally drawn to scale; the focus is on illustrating the gist of the invention.

[0033] Figure 1 This is a schematic diagram of the main structure of a heat exchanger core provided in Embodiment 1 of this utility model.

[0034] Figure 2 yes Figure 1 A magnified view of the area circled at the top.

[0035] Figure 3 yes Figure 1 A magnified view of the lower circled area.

[0036] Figure 4 This is a left-side view of the inner fin layer in the heat exchanger core provided in Embodiment 1 of this utility model.

[0037] Figure 5 yes Figure 4 A schematic diagram of the explosion structure.

[0038] Figure 6 yes Figure 4A schematic diagram showing the placement of the inner fins in the inner fin layer.

[0039] Figure 7 yes Figure 4 A top view of the inner finned structure.

[0040] Figure 8 yes Figure 4 A schematic diagram of the inner fin layer from a bottom view.

[0041] Figure 9 This is a schematic diagram of the main structure of the heat exchanger core and the left and right side end caps welded and fixed according to Embodiment 1 of this utility model.

[0042] Figure 10 This is a left-side view of the inner fin layer in the heat exchanger core provided in Embodiment 2 of this utility model.

[0043] Figure 11 yes Figure 10 A schematic diagram of the explosion structure.

[0044] Figure 12 This is a schematic diagram of the three-dimensional structure of the U-shaped insert. Detailed Implementation

[0045] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0046] Example 1:

[0047] like Figure 1 and Figures 4-6 As shown, the heat exchanger core provided in Embodiment 1 of this utility model includes a plurality of inner fin layers 1 and a plurality of outer fin layers 2; the inner fin layers 1 and the outer fin layers 2 are alternately arranged.

[0048] The inner fin layer 1 includes an upper core plate 11 and a lower core plate 13;

[0049] The bottom surface of the upper core plate 11 is provided with a plurality of downwardly protruding first protrusions 111; all the first protrusions 111 are spaced apart; the top surface of the lower core plate 13 is provided with a plurality of upwardly protruding second protrusions 131; one first protrusion 111 and one second protrusion 131 are arranged facing each other; the first protrusion 111 and the second protrusion 131 are in close contact.

[0050] When using the heat exchanger core provided in Embodiment 1 of this utility model, air, as the cooling medium, can flow through the outer fin layer 2; such as Figure 9As shown, end caps 01 are installed on both sides of the heat exchanger core 0. The position of the end caps 01 is offset from the inlet and outlet of the cold medium flowing in the outer fin layer 2. The hot medium enters the inner fin layer 1 through the end caps 01. The first protrusion 111 and the second protrusion 131 in the inner fin layer 1 replace the inner fins 12. The hot medium flows in the gap between the first protrusion 111 and exchanges heat through the first protrusion 111 and the second protrusion 131. The heat of the hot medium is transferred to the upper core plate 11 and the lower core plate 13 and dissipated through the outer fin layer 1.

[0051] The heat exchanger core provided in Embodiment 1 of this utility model includes an inner fin layer 1 comprising an upper core plate 11 and a lower core plate 13. Existing technology uses a single inner fin 12 between the upper core plate 11 and the lower core plate 13 for heat conduction, which is costly. To save on the production cost of the heat exchanger core 0, instead of using the inner fin 12 to transfer heat from the heat medium, the lower core plate 11 has several downward-protruding first protrusions 111 on its bottom surface, and the lower core plate 13 has several upward-protruding second protrusions 131 on its top surface, with one first protrusion 111 and one second protrusion 131 facing each other. When the heat medium flows in the inner fin layer 1, heat can be conducted from the first protrusions 111 and the second protrusions 131, thereby simulating the heat conduction capability of the inner fin 12 between the upper core plate 11 and the lower core plate 13. To maintain the stability of the inner fin layer 1... The upper core plate 11 and the lower core plate 13 are kept in a stable relative position, and the first protrusion 111 and the second protrusion 131 can improve the heat conduction efficiency, so that the first protrusion 111 and the second protrusion 131 are in close contact. Furthermore, in order to prevent the heat medium from being blocked in the inner fin layer 1, all the first protrusions 111 are spaced apart, so that the heat medium can fully contact the first protrusion 111 and the second protrusion 131 while flowing, thereby improving the heat conduction efficiency. Furthermore, when the heat medium flows through the first protrusion 111 and the second protrusion 131 in the inner fin layer 1, it is blocked by the first protrusion 111 and the second protrusion 131, which will cause the heat medium to form turbulence, so that the heat medium contacts multiple first protrusions 111 and the second protrusion 131 in the inner fin layer 1, increasing the contact area between the heat medium and the heat conduction medium, thereby improving the heat exchange efficiency.

[0052] like Figures 4-6 As shown, the heat exchanger core provided in Embodiment 1 of this utility model is preferably further provided with a plurality of inner fins 12 in order to further improve the heat conduction efficiency. The inner fins 12 are placed horizontally and are disposed between the upper core plate 11 and the lower core plate 13.

[0053] In order to keep the inner fin layer 1 stable and the upper core plate 11 and the lower core plate 13 in a stable relative position, when the inner fin 12 is between the upper core plate 11 and the lower core plate 13, the top of the inner fin 12 is in close contact with the bottom surface of the upper core plate 11, and the bottom of the inner fin 12 is in close contact with the top surface of the lower core plate 13. At this time, the inner fin 12 can directly transfer the heat of the heat medium to the upper core plate 11 and the lower core plate 13, thereby improving the heat conduction efficiency of the inner fin 12.

[0054] Furthermore, the inner fin 12 is staggered from the first protrusion 111. Compared with the prior art which uses a whole inner fin 12, the first protrusion 111 and the second protrusion 131 replace part of the inner fin 12, which improves heat exchange efficiency and reduces the cost of using the inner fin 12.

[0055] like Figure 1 As shown, the heat exchanger core provided in Embodiment 1 of this utility model preferably includes an outer fin layer 2 comprising an outer fin 21, a left sealing strip 22, and a right sealing strip 23. The outer fin 21 is placed horizontally between the left and right sealing strips 22 and 23. The outer fin layer 2 serves as a flow channel for the cold medium, guiding heat from the inner fin layer 1 from the upper core plate 11 and lower core plate 13 through the outer fin 21, and dissipating the heat on the outer fin 21 through air. Furthermore, to ensure air can flow through the inner fin 21, the inner fin layer 21 is designed to allow for the dissipation of heat from the inner fin 21. Fins 21 are placed along the left and right flow direction of the medium. The placement direction of the outer fins 21 is perpendicular to the placement direction of the inner fins 12. The end caps 01 are set on the left and right sides of the heat exchanger core 0. The hot medium enters the inner fin layer 1 from the end caps 01. Due to the left seal 22 and the right seal 23, the hot medium cannot enter the outer fin layer 2. When the placement direction of the outer fins 21 is set perpendicular to the placement direction of the inner fins 12, air can flow through the gaps in the outer fins 21, avoiding the air being blocked by the outer fins 21, thus affecting the heat exchange efficiency of the heat exchanger.

[0056] Furthermore, the top of the outer fin 21 is in close contact with the bottom surface of the lower core plate 13 of the upper inner fin layer 1, and the bottom of the outer fin 21 is in close contact with the top surface of the upper core plate 11 of the lower inner fin layer 1, so that the outer fin 21 can directly contact the upper core plate 11 and the lower core plate 13, thereby enhancing the heat conduction effect of the outer fin 21 and improving the heat exchange efficiency of the heat exchanger.

[0057] Furthermore, the top of the left seal 22 is tightly attached to the bottom surface of the lower core plate 13 of the upper inner fin layer 1, and the bottom of the left seal 22 is tightly attached to the top surface of the upper core plate 11 of the lower inner fin layer 1; the top of the right seal 23 is tightly attached to the bottom surface of the lower core plate 13 of the upper inner fin layer 1, and the bottom of the right seal 23 is tightly attached to the top surface of the upper core plate 11 of the lower inner fin layer 1. Through the above operations, the sealing effect of the left seal 22 and the right seal 23 on the outer fin layer 2 is enhanced, while ensuring that the outer fins 21 can effectively contact the upper core plate 11 and the lower core plate 13, so that the upper core plate 11 and the lower core plate 13 can remain parallel, thereby improving the stability of the heat exchanger core 0.

[0058] like Figures 1-3 As shown, the heat exchanger core provided in Embodiment 1 of this utility model is preferably provided that the top and bottom of the heat exchanger core 0 are both outer fin layers 2; the outer fin layer 2 located at the top of the heat exchanger core 0 is used as the first outer fin layer 3, and the outer fin layer 2 located at the bottom of the heat exchanger core 0 is used as the second outer fin layer 4.

[0059] In order to make the first outer fin layer 3 and the second outer fin layer 4 form a complete flow channel, an upper partition 5 and a lower partition 6 are also included; the upper partition 5 covers the top of the first outer fin layer 3, and the lower partition 6 covers the bottom of the second outer fin layer 4.

[0060] Furthermore, the bottom surface of the upper partition 5 is made to be in close contact with the top of the outer fin 21 of the first outer fin layer 3, thereby preventing the outer fin 21 in the first outer fin layer 3 from becoming loose; the top surface of the lower partition 6 is made to be in close contact with the bottom of the outer fin 21 of the second outer fin layer 4, thereby preventing the outer fin 21 in the second outer fin layer 4 from becoming loose.

[0061] Furthermore, the bottom surface of the upper partition 5 is tightly attached to the top of the left seal 22 of the first outer fin layer 3, and the left seal 22 of the first outer fin layer 3 forms a seal between the upper partition 5 and the upper core plate 11 of the next inner fin layer 1; the bottom surface of the upper partition 5 is tightly attached to the top of the right seal 23 of the first outer fin layer 3, and the right seal 23 of the first outer fin layer 3 forms a seal between the upper partition 5 and the upper core plate 11 of the next inner fin layer 1; thereby preventing the heat medium inside the end cap 01 from entering the first outer fin layer 3;

[0062] The top surface of the lower partition 6 is in close contact with the bottom of the left seal 22 of the second outer fin layer 4, and the left seal 22 of the second outer fin layer 4 forms a seal between the lower partition 6 and the lower core plate 13 of the upper inner fin layer 1; the top surface of the lower partition 6 is in close contact with the bottom of the right seal 23 of the second outer fin layer 4, and the right seal 23 of the second outer fin layer 4 forms a seal between the lower partition 6 and the lower core plate 13 of the upper inner fin layer 1; thereby preventing the heat medium inside the end cap 01 from entering the second outer fin layer 4.

[0063] like Figures 2-3 As shown, the heat exchanger core provided in Embodiment 1 of this utility model preferably includes an upper cover plate 7 and a lower cover plate 8 to protect the heat exchanger core 0. The upper cover plate 7 covers the top surface of the upper partition plate 5, and the lower cover plate 8 covers the bottom surface of the lower partition plate 6. The upper cover plate 7 can prevent the first outer fin layer 3 from directly colliding with external objects, and the lower cover plate 8 can prevent the second outer fin layer 4 from directly colliding with external objects, thereby reducing the risk of damage caused by the heat exchanger core 0 colliding with external objects and extending the service life of the heat exchanger core 0.

[0064] like Figures 4-5 As shown, the heat exchanger core provided in Embodiment 1 of this utility model, preferably, in order to further reduce the production cost of the heat exchanger core 0, can eliminate the front and rear sealing strips in the inner fin layer 1; a groove-shaped first extension 112 is provided on both the front and rear sides of the upper core plate 11, the first extension 112 is arranged in the left-right direction, and the length of the first extension 112 is equal to the length of the front side of the upper core plate 11; the upper core plate 11 and the first extension 112 are integrally formed to enhance the sealing of the upper core plate 11 and prevent the heat medium from flowing out; furthermore, the upper bottom surface of the first extension 112 is lower than the upper plate surface of the upper core plate 11, and the lower bottom surface of the first extension 112 is lower than the lower plate surface of the upper core plate 11, so that the first extension 112 forms a groove relative to the upper core plate 11;

[0065] A grooved second extension 132 is provided on both the front and rear sides of the lower core plate 13. The second extension 132 is arranged in the left-right direction and its length is equal to the length of the front side of the lower core plate 13. The lower core plate 13 and the second extension 132 are integrally formed to enhance the sealing of the upper core plate 11 and prevent the hot medium from flowing out. Furthermore, the upper surface of the second extension 132 is higher than the upper plate surface of the lower core plate 13, and the lower surface of the second extension 132 is higher than the lower plate surface of the lower core plate 13. The bottom of the groove of the second extension 132 is arranged facing upward, so that the second extension 132 forms an upward protruding groove relative to the lower core plate 13.

[0066] Furthermore, since the length of the first extension 112 is equal to the length of the front side of the upper core plate 11, and the length of the second extension 132 is equal to the length of the front side of the lower core plate 13, when the lower bottom surface of the first extension 112 and the upper surface of the second extension 132 are in close contact and fixed, an inner fin layer 1 with front and rear closed is formed between the upper core plate 11 and the lower core plate 13, thereby saving the front and rear sealing strips required for sealing the front and rear sides of the inner fin layer 1, and thus reducing the cost of producing the heat exchanger core 0.

[0067] like Figures 4-5As shown, in the heat exchanger core provided in Embodiment 1 of this utility model, preferably, since the left sealing strip 22 and the right sealing strip 23 are tightly attached to the upper surface of the upper core plate 11 or the lower surface of the lower core plate 13 in the inner fin layer 1, and the first extension 112 and the second extension 132 are grooved, there is a gap between the sealing strip and the extension. In order to tightly weld the end cap 01 to both sides of the heat exchanger core 0, it is necessary to increase the welding thickness between the heat exchanger core 0 and the left and right end caps 01. Therefore, it is necessary to fill the gap between the sealing strip and the extension to form a thicker welding thickness, that is, to increase the thickness of the welding between the upper core plate 11 and the extension. The thickness of the lower core plate 13 allows for a larger contact area between the upper core plate 11 and the end cap 01, thus enabling better welding of the end caps 01 on both sides to the heat exchanger core 0. By designating the side closest to the center of the upper core plate 11 as the inner side, the outer sidewall of the first extension 112 and the outer sidewall of the second extension 132 are inclined outwards, making the groove opening wider and facilitating the fixing of objects at the groove of the first extension 112 or the second extension 132, thereby increasing the thickness of the upper core plate 11 and the lower core plate 13.

[0068] Furthermore, in order to increase the thickness of the upper core plate 11 and the lower core plate 13, the inner fin layer 1 also includes a number of first inserts 14 and a number of second inserts 15. The first inserts 14 and the second inserts 15 are cuboid in shape and can be fitted into the grooves of the first extension 112 or the second extension 132.

[0069] The first insert 14 is horizontally positioned so that it is fixed to the upper bottom surface of the first extension 112. When the first insert 14 is positioned at the left and right ends of the inner fin layer 1, the side wall of the first insert 14 is flush with the side wall of the upper core plate 11, increasing the contact area between the upper core plate 11 and the end cap 01, which is beneficial for fixing the end cap 01 and the upper core plate 11 together. The second insert 14 is horizontally positioned so that it is fixed to the lower surface of the second extension 132. When the second insert 14 is positioned at the left and right ends of the inner fin layer 1, the side wall of the second insert 14 is flush with the side wall of the lower core plate 13, increasing the contact area between the lower core plate 13 and the end cap 01, which is beneficial for fixing the end cap 01 and the lower core plate 13 together.

[0070] like Figure 6As shown, in the heat exchanger core provided in Embodiment 1 of this utility model, preferably, when the inner fins 12 are disposed at the left and right ends of the inner fin layer 1, the side of the inner fins 12 is flush with the side of the upper core plate 11; when the inner fins 12 are disposed at the left and right ends of the inner fin layer 1, the upper core plate 11 and the lower core plate 13 can be kept parallel by means of the inner fins 12, thereby avoiding the loosening of the left sealing strip 22 or right sealing strip 23 of the upper and lower layers of the inner fin layer 1, so that the left sealing strip 22 or right sealing strip 23 can be tightly attached to the upper core plate 11 or the lower core plate 13, thereby improving the stability of the heat exchanger core 0.

[0071] like Figures 7-8 As shown, the heat exchanger core provided in Embodiment 1 of this utility model is preferably further reduced in production cost by forming a first protrusion 111 and a second protrusion 131 by stamping. The top of the first protrusion 111 is provided with a first intaglio 113 with the same outline as the first protrusion 111, and the bottom of the second protrusion 131 is provided with a second intaglio 133 with the same outline as the second protrusion 131. This reduces the amount of material used in the preparation of the upper core plate 11 and the lower core plate 13. At the same time, the use of thinner materials for the first protrusion 111 and the second protrusion 131 can reduce the heat transfer time and improve the heat exchange efficiency of the heat exchanger.

[0072] Example 2:

[0073] The heat exchanger core provided in Embodiment 2 of this utility model includes a plurality of inner fin layers 1 and a plurality of outer fin layers 2; the inner fin layers 1 and the outer fin layers 2 are alternately arranged.

[0074] The inner fin layer 1 includes an upper core plate 11 and a lower core plate 13; the bottom surface of the upper core plate 11 is provided with a plurality of downwardly protruding first protrusions 111; all the first protrusions 111 are spaced apart; the top surface of the lower core plate 13 is provided with a plurality of upwardly protruding second protrusions 131; one first protrusion 111 and one second protrusion 131 are arranged facing each other; the first protrusion 111 and the second protrusion 131 are in close contact.

[0075] When using the heat exchanger core provided in Embodiment 2 of this utility model, air can flow through the outer fin layer 2 as a cold medium; end caps 01 are installed on both sides of the heat exchanger core 0, and the position of the end caps 01 is offset from the inlet and outlet of the cold medium flowing in the outer fin layer 2; the hot medium enters the inner fin layer 1 through the end caps 01, and the first protrusion 111 and the second protrusion 131 in the inner fin layer 1 replace the inner fin 12. The hot medium flows in the gap between the first protrusion 111 and exchanges heat through the first protrusion 111 and the second protrusion 131. The heat of the hot medium is transferred to the upper core plate 11 and the lower core plate 13 and dissipates through the outer fin layer 1.

[0076] The heat exchanger core provided in Embodiment 2 of this utility model includes an inner fin layer 1 comprising an upper core plate 11 and a lower core plate 13. Existing technology uses a single inner fin 12 between the upper core plate 11 and the lower core plate 13 for heat conduction, which is costly. To save on the production cost of the heat exchanger core 0, instead of using the inner fin 12 to transfer heat from the heat medium, the lower core plate 11 has several downward-protruding first protrusions 111 on its bottom surface, and the lower core plate 13 has several upward-protruding second protrusions 131 on its top surface, with one first protrusion 111 and one second protrusion 131 facing each other. When the heat medium flows in the inner fin layer 1, heat can be conducted from the first protrusions 111 and the second protrusions 131, thereby simulating the heat conduction capability of the inner fin 12 between the upper core plate 11 and the lower core plate 13. To maintain the stability of the inner fin layer 1... The upper core plate 11 and the lower core plate 13 are kept in a stable relative position, and the first protrusion 111 and the second protrusion 131 can improve the heat conduction efficiency, so that the first protrusion 111 and the second protrusion 131 are in close contact. Furthermore, in order to prevent the heat medium from being blocked in the inner fin layer 1, all the first protrusions 111 are spaced apart, so that the heat medium can fully contact the first protrusion 111 and the second protrusion 131 while flowing, thereby improving the heat conduction efficiency. Furthermore, when the heat medium flows through the first protrusion 111 and the second protrusion 131 in the inner fin layer 1, it is blocked by the first protrusion 111 and the second protrusion 131, which will cause the heat medium to form turbulence, so that the heat medium contacts multiple first protrusions 111 and the second protrusion 131 in the inner fin layer 1, increasing the contact area between the heat medium and the heat conduction medium, thereby improving the heat exchange efficiency.

[0077] The heat exchanger core provided in Embodiment 2 of this utility model is preferably further provided with an inner fin layer 1 including a plurality of inner fins 12 in order to further improve the heat conduction efficiency. The inner fins 12 are placed horizontally and are disposed between the upper core plate 11 and the lower core plate 13.

[0078] In order to keep the inner fin layer 1 stable and the upper core plate 11 and the lower core plate 13 in a stable relative position, when the inner fin 12 is between the upper core plate 11 and the lower core plate 13, the top of the inner fin 12 is in close contact with the bottom surface of the upper core plate 11, and the bottom of the inner fin 12 is in close contact with the top surface of the lower core plate 13. At this time, the inner fin 12 can directly transfer the heat of the heat medium to the upper core plate 11 and the lower core plate 13, thereby improving the heat conduction efficiency of the inner fin 12.

[0079] Furthermore, the inner fin 12 is staggered from the first protrusion 111. Compared with the prior art which uses a whole inner fin 12, the first protrusion 111 and the second protrusion 131 replace part of the inner fin 12, which improves heat exchange efficiency and reduces the cost of using the inner fin 12.

[0080] The heat exchanger core provided in Embodiment 2 of this utility model preferably includes an outer fin layer 2 comprising an outer fin 21, a left sealing strip 22, and a right sealing strip 23. The outer fin 21 is placed horizontally between the left and right sealing strips 22 and 23. The outer fin layer 2 serves as a flow channel for the cold medium, guiding heat from the inner fin layer 1 from the upper core plate 11 and lower core plate 13 through the outer fin 21, and dissipating the heat on the outer fin 21 through air. Furthermore, to ensure air can flow through the inner fin 21, the inner fin... The outer fin 21 is placed along the left and right flow direction of the medium. The placement direction of the outer fin 21 is perpendicular to the placement direction of the inner fin 12. The end cap 01 is set on the left and right sides of the heat exchanger core 0. The hot medium enters the inner fin layer 1 from the end cap 01. Due to the left seal 22 and the right seal 23, the hot medium cannot enter the outer fin layer 2. When the placement direction of the outer fin 21 is set perpendicular to the placement direction of the inner fin 12, the air can flow through the gaps of the outer fin 21, avoiding the air being blocked by the outer fin 21, thereby affecting the heat exchange efficiency of the heat exchanger.

[0081] Furthermore, the top of the outer fin 21 is in close contact with the bottom surface of the lower core plate 13 of the upper inner fin layer 1, and the bottom of the outer fin 21 is in close contact with the top surface of the upper core plate 11 of the lower inner fin layer 1, so that the outer fin 21 can directly contact the upper core plate 11 and the lower core plate 13, thereby enhancing the heat conduction effect of the outer fin 21 and improving the heat exchange efficiency of the heat exchanger.

[0082] Furthermore, the top of the left seal 22 is tightly attached to the bottom surface of the lower core plate 13 of the upper inner fin layer 1, and the bottom of the left seal 22 is tightly attached to the top surface of the upper core plate 11 of the lower inner fin layer 1; the top of the right seal 23 is tightly attached to the bottom surface of the lower core plate 13 of the upper inner fin layer 1, and the bottom of the right seal 23 is tightly attached to the top surface of the upper core plate 11 of the lower inner fin layer 1. Through the above operations, the sealing effect of the left seal 22 and the right seal 23 on the outer fin layer 2 is enhanced, while ensuring that the outer fins 21 can effectively contact the upper core plate 11 and the lower core plate 13, so that the upper core plate 11 and the lower core plate 13 can remain parallel, thereby improving the stability of the heat exchanger core 0.

[0083] The heat exchanger core provided in Embodiment 2 of this utility model is preferably provided in that the top and bottom of the heat exchanger core 0 are both outer fin layers 2; the outer fin layer 2 located at the top of the heat exchanger core 0 is used as the first outer fin layer 3, and the outer fin layer 2 located at the bottom of the heat exchanger core 0 is used as the second outer fin layer 4.

[0084] In order to make the first outer fin layer 3 and the second outer fin layer 4 form a complete flow channel, an upper partition 5 and a lower partition 6 are also included; the upper partition 5 covers the top of the first outer fin layer 3, and the lower partition 6 covers the bottom of the second outer fin layer 4.

[0085] Furthermore, the bottom surface of the upper partition 5 is made to be in close contact with the top of the outer fin 21 of the first outer fin layer 3, thereby preventing the outer fin 21 in the first outer fin layer 3 from becoming loose; the top surface of the lower partition 6 is made to be in close contact with the bottom of the outer fin 21 of the second outer fin layer 4, thereby preventing the outer fin 21 in the second outer fin layer 4 from becoming loose.

[0086] Furthermore, the bottom surface of the upper partition 5 is tightly attached to the top of the left seal 22 of the first outer fin layer 3, and the left seal 22 of the first outer fin layer 3 forms a seal between the upper partition 5 and the upper core plate 11 of the next inner fin layer 1; the bottom surface of the upper partition 5 is tightly attached to the top of the right seal 23 of the first outer fin layer 3, and the right seal 23 of the first outer fin layer 3 forms a seal between the upper partition 5 and the upper core plate 11 of the next inner fin layer 1; thereby preventing the heat medium inside the end cap 01 from entering the first outer fin layer 3;

[0087] The top surface of the lower partition 6 is in close contact with the bottom of the left seal 22 of the second outer fin layer 4, and the left seal 22 of the second outer fin layer 4 forms a seal between the lower partition 6 and the lower core plate 13 of the upper inner fin layer 1; the top surface of the lower partition 6 is in close contact with the bottom of the right seal 23 of the second outer fin layer 4, and the right seal 23 of the second outer fin layer 4 forms a seal between the lower partition 6 and the lower core plate 13 of the upper inner fin layer 1; thereby preventing the heat medium inside the end cap 01 from entering the second outer fin layer 4.

[0088] The heat exchanger core provided in Embodiment 2 of this utility model preferably includes an upper cover plate 7 and a lower cover plate 8 to protect the heat exchanger core 0. The upper cover plate 7 covers the top surface of the upper partition plate 5, and the lower cover plate 8 covers the bottom surface of the lower partition plate 6. The upper cover plate 7 can prevent the first outer fin layer 3 from directly colliding with external objects, and the lower cover plate 8 can prevent the second outer fin layer 4 from directly colliding with external objects, thereby reducing the risk of damage caused by the heat exchanger core 0 colliding with external objects and extending the service life of the heat exchanger core 0.

[0089] like Figures 10-11As shown, in the heat exchanger core provided in Embodiment 2 of this utility model, preferably, in order to further reduce the production cost of the heat exchanger core 0, the front and rear sealing strips in the inner fin layer 1 can be omitted; an L-shaped first bending portion 114 is provided on both the front and rear sides of the upper core plate 11, the first bending portion 114 is arranged downward, the top of the vertical plate of the upper core plate 11 and the first bending portion 114 are fixed together, the side near the center of the upper core plate 11 is taken as the inner side, and the horizontal plate of the first bending portion 114 extends outward. The upper surface of the horizontal plate of the first bend 114 is lower than the upper surface of the upper core plate 11, and the lower surface of the horizontal plate of the first bend 114 is lower than the lower surface of the upper core plate 11. In order to completely seal the front and rear sides of the upper core plate 11 and the lower core plate 13 in the inner fin layer 1, the first bend 114 is arranged in the left and right direction, and the length of the first bend 114 is equal to the length of the front side of the upper core plate 11. Furthermore, the upper core plate 11 and the first bend 114 are integrally formed to enhance the sealing of the upper core plate 11 and prevent the heat medium from flowing out.

[0090] L-shaped second bends 134 are provided on both the front and rear sides of the lower core plate 13. The second bends 134 are upwardly oriented, and the bottom of the vertical plate of the lower core plate 13 and the second bend 134 are fixed together. The horizontal plate of the second bend 134 extends outward, and the upper surface of the horizontal plate of the second bend 134 is higher than the upper surface of the lower core plate 13. The lower surface of the horizontal plate of the second bend 134 is higher than the lower surface of the lower core plate 13. In order to completely seal the front and rear sides of the upper core plate 11 and the lower core plate 13 in the inner fin layer 1, the second bend 134 is arranged in the left and right direction, and the length of the second bend 134 is equal to the length of the front side of the lower core plate 13. Furthermore, the lower core plate 13 and the second bend 134 are integrally formed to enhance the sealing of the upper core plate 11 and prevent the heat medium from flowing out.

[0091] Furthermore, since the length of the first bend 114 is equal to the length of the front side of the upper core plate 11, and the length of the second bend 134 is equal to the length of the front side of the lower core plate 13, when the lower plate surface of the horizontal plate of the first bend 114 and the upper plate surface of the horizontal plate of the second bend 134 are in close contact and fixed, an inner fin layer 1 with front and rear closed is formed between the upper core plate 11 and the lower core plate 13, thereby saving the front and rear sealing strips required for sealing the front and rear sides of the inner fin layer 1, and thus reducing the cost of producing the heat exchanger core 0.

[0092] like Figures 10-12As shown, in the heat exchanger core provided in Embodiment 2 of this utility model, preferably, since the left sealing strip 22 and the right sealing strip 23 are closely attached to the upper plate surface of the upper core plate 11 or the lower plate surface of the lower core plate 13 in the inner fin layer 1, and the first bending part 114 and the second bending part 134 are L-shaped, there is a gap between the sealing strip and the bending part. In order to weld the end cap 01 tightly to both sides of the heat exchanger core 0, it is necessary to increase the welding thickness between the heat exchanger core 0 and the left and right end caps 01. For this purpose, it is necessary to fill the gap between the sealing strip and the bending part to form a thicker welding thickness, that is, to increase the thickness of the upper core plate 11 and the lower core plate 13, so that the upper core plate 11 and the end cap 01 have a larger contact area, and the lower core plate 13 and the end cap 01 have a larger contact area.

[0093] Furthermore, to increase the thickness of the upper core plate 11 and the lower core plate 13, the inner fin layer 1 also includes several U-shaped inserts 16; the vertical cross-section of the U-shaped inserts 16 is U-shaped; the U-shaped inserts 16 are horizontally arranged, with the upper sidewall of the U-shaped insert 16 fixed to the upper plate surface of the horizontal plate of the first bending part 114, and the lower sidewall of the U-shaped insert 16 fixed to the lower plate surface of the horizontal plate of the second bending part 134; when the U-shaped inserts 16 are arranged at the left and right ends of the inner fin layer 1, the sidewall of the U-shaped insert 16 is flush with the sidewall of the upper core plate 11, increasing the contact area between the upper core plate 11 and the end cap 01, which is beneficial for fixing the end cap 01 and the upper core plate 11 together; the sidewall of the U-shaped insert 16 is flush with the sidewall of the lower core plate 13, increasing the contact area between the lower core plate 13 and the end cap 01, which is beneficial for fixing the end cap 01 and the lower core plate 13 together.

[0094] The heat exchanger core provided in Embodiment 2 of this utility model is preferably provided in that, when the inner fins 12 are disposed at the left and right ends of the inner fin layer 1, the side of the inner fins 12 is flush with the side of the upper core plate 11 and the side of the inner fins 12 is flush with the side of the lower core plate 13. When the inner fins 12 are disposed at the left and right ends of the inner fin layer 1, the upper core plate 11 and the lower core plate 13 can be kept parallel by means of the inner fins 12, thereby avoiding the loosening of the left sealing strip 22 or right sealing strip 23 of the upper and lower layers of the inner fin layer 1, so that the left sealing strip 22 or right sealing strip 23 can be tightly attached to the upper core plate 11 or the lower core plate 13, thereby improving the stability of the heat exchanger core 0.

[0095] The heat exchanger core provided in Embodiment 2 of this utility model is preferably further reduced in terms of production cost. The first protrusion 111 and the second protrusion 131 are formed by embossing. The top of the first protrusion 111 is provided with a first intaglio 113 with the same outline as the first protrusion 111, and the bottom of the second protrusion 131 is provided with a second intaglio 133 with the same outline as the second protrusion 131. This reduces the amount of material used in the preparation of the upper core plate 11 and the lower core plate 13. At the same time, the use of thinner materials for the first protrusion 111 and the second protrusion 131 can reduce the heat transfer time and improve the heat exchange efficiency of the heat exchanger.

[0096] In summary, the heat exchanger core provided by this utility model can solve the problem of the prior art using a whole piece of inner fin to cover the second partition plate in the inner fin layer, which results in too many inner fins used in the inner fin layer and increases the production cost of the heat exchanger, thereby reducing the production cost of the heat exchanger.

[0097] Those skilled in the art should understand that variations can be implemented by combining existing technology and the above embodiments, and will not be elaborated here. Such variations do not affect the substantive content of this utility model, and will not be elaborated here.

[0098] The preferred embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and the devices and structures not described in detail should be understood as being implemented in a conventional manner in the art; any possible variations and modifications made by those skilled in the art without departing from the technical solution of this utility model, or equivalent embodiments with equivalent changes, do not affect the essential content of this utility model. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from the content of the technical solution of this utility model, shall still fall within the protection scope of the technical solution of this utility model.

Claims

1. A heat exchanger core, characterized in that, It includes several inner fin layers and several outer fin layers; the inner fin layers and the outer fin layers are alternately arranged; The inner fin layer includes an upper core plate and a lower core plate; The bottom surface of the upper core plate is provided with a plurality of downwardly protruding first protrusions; all the first protrusions are spaced apart; the top surface of the lower core plate is provided with a plurality of upwardly protruding second protrusions; one first protrusion and one second protrusion are arranged facing each other; the first protrusion and the second protrusion are in close contact.

2. The heat exchanger core as described in claim 1, characterized in that, The inner fin layer further includes a plurality of inner fins; the inner fins are placed horizontally; the inner fins are disposed between the upper core plate and the lower core plate; the top of the inner fins is in close contact with the bottom surface of the upper core plate; the bottom of the inner fins is in close contact with the top surface of the lower core plate; the inner fins are offset from the first protrusion.

3. The heat exchanger core as described in claim 2, characterized in that, The outer fin layer includes an outer fin, a left seal, and a right seal; the outer fin is placed horizontally; the outer fin is located between the left seal and the right seal; the inner fin is placed along the left-right flow direction of the medium; the placement direction of the outer fin is perpendicular to the placement direction of the inner fin. The top of the outer fin is in close contact with the bottom surface of the lower core plate of the upper inner fin layer; the bottom of the outer fin is in close contact with the top surface of the upper core plate of the lower inner fin layer. The top of the left seal is in close contact with the bottom surface of the lower core plate of the upper inner fin layer; the bottom of the left seal is in close contact with the top surface of the upper core plate of the lower inner fin layer. The top of the right seal is in close contact with the bottom surface of the lower core plate of the upper inner fin layer; the bottom of the right seal is in close contact with the top surface of the upper core plate of the lower inner fin layer.

4. The heat exchanger core as described in claim 3, characterized in that, If the top and bottom of the heat exchanger core are both the outer fin layer; the outer fin layer located at the top of the heat exchanger core is designated as the first outer fin layer, and the outer fin layer located at the bottom of the heat exchanger core is designated as the second outer fin layer; It also includes an upper partition and a lower partition; the upper partition covers the top of the first outer fin layer; the lower partition covers the bottom of the second outer fin layer; The bottom surface of the upper partition is in close contact with the top of the outer fin of the first outer fin layer; the top surface of the lower partition is in close contact with the bottom of the outer fin of the second outer fin layer. The bottom surface of the upper partition is in close contact with the top of the left seal of the first outer fin layer; the top surface of the lower partition is in close contact with the bottom of the left seal of the second outer fin layer. The bottom surface of the upper partition is in close contact with the top of the right seal of the first outer fin layer; the top surface of the lower partition is in close contact with the bottom of the right seal of the second outer fin layer.

5. The heat exchanger core as described in claim 4, characterized in that, It also includes an upper cover plate and a lower cover plate; the upper cover plate covers the top surface of the upper partition plate; the lower cover plate covers the bottom surface of the lower partition plate.

6. The heat exchanger core as described in claim 3, characterized in that, The upper core board has a groove-shaped first extension on both its front and rear sides; the first extension is arranged in the left-right direction; the length of the first extension is equal to the length of the upper core board; the upper core board and the first extension are integrally formed; the upper bottom surface of the first extension is lower than the upper surface of the upper core board; the lower bottom surface of the first extension is lower than the lower surface of the upper core board. The lower core plate has a groove-shaped second extension on both its front and rear sides; the bottom of the groove of the second extension faces upward; the second extension is arranged in the left-right direction; the length of the second extension is equal to the length of the lower core plate; the lower core plate and the second extension are integrally formed; the upper surface of the second extension is higher than the upper surface of the lower core plate; the lower surface of the second extension is higher than the lower surface of the lower core plate. The lower surface of the first extension is in close contact with the upper surface of the second extension.

7. The heat exchanger core as described in claim 6, characterized in that, The side closest to the center of the upper core board is designated as the inner side; the outer sidewall of the first extension slopes outward; the outer sidewall of the second extension slopes outward; The inner fin layer further includes a plurality of first inserts and a plurality of second inserts; the first inserts are horizontally arranged; the first inserts are fixed to the upper bottom surface of the first extension; when the first inserts are arranged at the left and right ends of the inner fin layer, the sidewall of the first insert is flush with the sidewall of the upper core plate; the second inserts are horizontally arranged; the second inserts are fixed to the lower surface of the second extension; when the second inserts are arranged at the left and right ends of the inner fin layer, the sidewall of the second insert is flush with the sidewall of the lower core plate.

8. The heat exchanger core as described in claim 3, characterized in that, The upper core board has L-shaped first bends on both its front and rear sides; the first bends are downwardly oriented; the top of the upper core board is fixed to the vertical plate of the first bend; the side closest to the center of the upper core board is designated as the inner side; the horizontal plate of the first bend extends outward; the first bend is oriented in the left-right direction; the length of the first bend is equal to the length of the upper core board; the upper core board and the first bend are integrally formed; the upper surface of the horizontal plate of the first bend is lower than the upper surface of the upper core board; the lower surface of the horizontal plate of the first bend is lower than the lower surface of the upper core board. The lower core plate has L-shaped second bends on both its front and rear sides; the second bends are oriented upwards; the bottom of the lower core plate is fixed to the vertical plate of the second bend; the horizontal plate of the second bend extends outwards; the second bend is oriented in the left-right direction; the length of the second bend is equal to the length of the lower core plate; the lower core plate and the second bend are integrally formed; the upper surface of the horizontal plate of the second bend is higher than the upper surface of the lower core plate; the lower surface of the horizontal plate of the second bend is higher than the lower surface of the lower core plate. The lower surface of the horizontal plate of the first bend is in close contact with the upper surface of the horizontal plate of the second bend.

9. The heat exchanger core as described in claim 8, characterized in that, The inner fin layer also includes several U-shaped inserts; the vertical cross-section of the U-shaped inserts is U-shaped; the U-shaped inserts are horizontally arranged; the upper sidewall of the U-shaped insert is fixed to the upper surface of the horizontal plate of the first bending portion; the lower sidewall of the U-shaped insert is fixed to the lower surface of the horizontal plate of the second bending portion; when the U-shaped inserts are arranged at the left and right ends of the inner fin layer, the sidewall of the U-shaped insert is flush with the sidewall of the upper core plate, and the sidewall of the U-shaped insert is flush with the sidewall of the lower core plate.

10. The heat exchanger core as described in claim 2, characterized in that, When the inner fins are disposed at the left and right ends of the inner fin layer, the side of the inner fins is flush with the side of the upper core plate, and the side of the inner fins is flush with the side of the lower core plate.

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