Micro-channel heat exchanger
By employing a microchannel structure arranged in a diamond honeycomb pattern and using 3D printing technology in the heat exchanger, the problems of large size, low efficiency, and complex structure of existing heat exchangers have been solved, achieving efficient, simplified heat exchange and enhanced safety.
Patent Information
- Application Number
- CN202511669031.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-14
- Publication Date
- 2026-01-09
AI Technical Summary
Existing heat exchangers are bulky, have few heat exchange channels, rigid structures, low heat exchange efficiency, large differences in flow distribution, complex assembly, and the risk of leakage.
A microchannel heat exchanger is adopted, including a heat exchange core and a distributor. The heat exchange channels are arranged in a diamond honeycomb pattern. The medium flows alternately through the honeycomb outlet channel and the heat exchange channel. The heat exchange core and distributor are manufactured using 3D printing technology, which simplifies the structure and increases the heat exchange area.
It significantly increases the heat exchange area, improves heat exchange efficiency, simplifies the structure, facilitates assembly and maintenance, reduces the risk of leakage, and ensures uniform flow distribution without dead zones.
Smart Images
Figure CN121297538A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of heat exchangers, in particular to a micro-channel heat exchanger. BACKGROUND
[0002] The heat exchanger is one of the important heat management components in the industrial field, and the inside thereof is usually provided with adjacent heat exchange channels. By passing the heat exchange fluid and the fluid to be heat exchanged into different heat exchange channels, heat exchange between the heat exchange fluid and the fluid to be heat exchanged is realized. The plate heat exchanger or other heat exchangers in the prior art are relatively large in size, but the heat exchange channels inside are less arranged, the structure is rigid, the area of the part capable of effectively contacting and heat exchanging between different pipes is insufficient, the heat exchange efficiency is not high, and the flow distribution difference between the flow channels is large. In addition, the assembly relationship between each part of the existing heat exchanger is complex, which is not only inconvenient to disassemble and assemble, but also has a risk of leakage. SUMMARY
[0003] The purpose of the present application is to provide a micro-channel heat exchanger with simple structure and high heat exchange efficiency.
[0004] To achieve this purpose, the present application adopts the following technical scheme: a micro-channel heat exchanger, comprising a heat exchange core and two distributors, the heat exchange core is provided with a plurality of heat exchange channels, the heat exchange channels are communicated with both sides of the heat exchange core along the length direction of the heat exchange core, the projection of the heat exchange channel on the cross section perpendicular to the length direction of the heat exchange core is a rhombus, and a plurality of heat exchange channels are arranged in a honeycomb shape; the two distributors are oppositely arranged and fixed on both sides of the heat exchange core along the length direction of the heat exchange core, the bottom end of the distributor is provided with a first inlet, and the top end is provided with a second inlet, a plurality of first distribution channels and a plurality of second distribution channels are arranged in the distributor, the first distribution channels and the second distribution channels are arranged in a staggered manner along the vertical direction, a plurality of first distribution channels are communicated with the first inlet, a plurality of second distribution channels are communicated with the second inlet, the side of the distributor facing the heat exchange core is provided with an outlet channel arranged in a honeycomb shape, the outlet channel and the heat exchange channel are communicated one by one, and along the height direction of the heat exchange core, the outlet channels at the same height in the honeycomb-shaped outlet channel are communicated with the same first distribution channel or the same second distribution channel.
[0005] As a preferred, the heat exchange core is an integral 3D printed part, the heat exchange core comprises a plurality of printing layers, the plurality of printing layers are arranged along the length direction of the heat exchange core, the printing layer is provided with a plurality of flow guide holes, the plurality of flow guide holes are arranged in a honeycomb shape, and the flow guide holes corresponding in position on the plurality of printing layers are communicated in sequence to form the heat exchange channel.
[0006] As a preferred, the projection of the flow guide hole on the cross section perpendicular to the width direction of the heat exchange core is V-shaped.
[0007] As preferred, the flow guide hole comprises a first hole section and a second hole section, the first hole section and the second hole section are arranged at an angle and communicate with each other, and the angle between the first hole section and the second hole section is 30°-150°.
[0008] As preferred, the wall thickness between two adjacent flow guide holes is 0.2mm-2mm.
[0009] As preferred, the projection of the printing layer on the projection plane perpendicular to the length direction of the heat exchange core body is rectangular.
[0010] As preferred, the distributor and the printing layer material are the same, and the distributor is also an integrally formed 3D printed part.
[0011] As preferred, along the width direction of the heat exchange core body, the two side walls of the heat exchange core body are flush with the two side walls of the distributor.
[0012] As preferred, along the length direction of the heat exchange core body, the outer peripheral wall of the second inlet protrudes from the side wall of the one side of the distributor towards the heat exchange core body and overlaps the heat exchange core body.
[0013] As preferred, the opening of the outlet channel towards one end of the heat exchange core body is rhombic and matches the shape of the heat exchange channel, the opening of the outlet channel away from one end of the heat exchange core body is rectangular, and the rhombic opening of the outlet channel and the rectangular opening of the outlet channel are smoothly connected through an arc surface.
[0014] The beneficial effects of the present application: when the micro-channel heat exchanger works, the first heat exchange medium is introduced into the heat exchange core body from the first inlet of the distributor at one end, the second heat exchange medium is introduced into the heat exchange core body from the second inlet of the distributor at the other end, the first heat exchange medium sequentially passes through the first sub-channel, the outlet channel communicated with the first sub-channel, and the heat exchange channel communicated with the outlet channel, and then is discharged from the first inlet of the heat exchanger at the other end; the second heat exchange medium sequentially passes through the second sub-channel, the outlet channel communicated with the second sub-channel, and the heat exchange channel communicated with the outlet channel, and then is discharged from the second inlet of the heat exchanger where the first heat exchange medium is input. By arranging the rhombic and honeycomb-shaped heat exchange channels, the first heat exchange medium in each heat exchange channel can exchange heat with the second heat exchange medium in the adjacent four heat exchange channels through the four side walls of the heat exchange channel, so that the first heat exchange medium and the second heat exchange medium are staggered and contacted, the heat exchange area is greatly increased, the heat exchange efficiency is improved, and the micro-channel heat exchanger mainly comprises two components of the heat exchange core body and the distributor, which can simplify the structure of the micro-channel heat exchanger and facilitate the assembly and subsequent maintenance of the micro-channel heat exchanger. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1Fig. 1 is a structural schematic diagram of a micro-channel heat exchanger according to an embodiment of the present application;
[0016] Figure 2 Fig. 2 is a schematic diagram of the communication between the first sub-channel and the heat exchange channel according to an embodiment of the present application;
[0017] Figure 3 Fig. 3 is a schematic diagram of the communication between the second sub-channel and the heat exchange channel according to an embodiment of the present application;
[0018] Figure 4 Fig. 4 is a structural schematic diagram of a printing layer according to an embodiment of the present application;
[0019] Figure 5 Fig. 5 is a sectional view of a printing layer according to an embodiment of the present application;
[0020] Figure 6 Fig. 6 is a structural schematic diagram of a distributor according to an embodiment of the present application.
[0021] In the figure: 1, heat exchange core; 11, heat exchange channel; 12, printing layer; 121, flow guide hole; 2, distributor; 21, first inlet; 22, second inlet; 23, first sub-channel; 24, second sub-channel; 25, outlet channel. Specific embodiments
[0022] The present application will be further described below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures.
[0023] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrated; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0024] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature is "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature is "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.
[0025] In the description of the present embodiment, the terms "upper", "lower", "right", "left", and other orientation or position relationships are based on the orientation or position relationships shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.
[0026] Referring to Figures 1 to 6 As shown in the drawings, according to the micro-channel heat exchanger provided by the embodiment of the present application, the micro-channel heat exchanger comprises a heat exchange core 1 and two distributors 2, the heat exchange core 1 is provided with a plurality of heat exchange channels 11, the heat exchange channels 11 are communicated with both sides of the heat exchange core 1 along the length direction of the heat exchange core 1. The projection of the heat exchange channel 11 on the cross section perpendicular to the length direction of the heat exchange core 1 is a rhombus. The plurality of heat exchange channels 11 are arranged in a honeycomb shape, that is, the four sides of one rhombus-shaped heat exchange channel 11 are also the sides of the heat exchange channel 11 adjacent to four heat exchange channels 11 on one side of the heat exchange channel 11 (except for the heat exchange channel 11 at the edge).
[0027] The two distributors 2 are identical in structure and equal in size, and are oppositely arranged and fixed to the two sides of the heat exchange core 1 along the length direction of the heat exchange core 1. The bottom end of the distributor 2 is provided with a first inlet 21, and the top end is provided with a second inlet 22. The distributor 2 is provided with a plurality of first sub-channels 23 and a plurality of second sub-channels 24. The first sub-channels 23 extend along the width direction of the heat exchange core 1, and the second sub-channels 24 extend along the width direction of the heat exchange core 1. The first sub-channels 23 and the second sub-channels 24 are staggered in the vertical direction. The plurality of first sub-channels 23 are communicated with the first inlet 21 through a first main channel, and the plurality of second sub-channels 24 are communicated with the second inlet 22 through a second main channel. The distributor 2 is provided with a honeycomb-shaped outlet channel 25 on the side facing the heat exchange core 1, and the outlet channel 25 and the heat exchange channel 11 are communicated one by one. Along the height direction of the heat exchange core 1, the outlet channels 25 at the same height in the honeycomb-shaped outlet channel 25 are communicated with the same first sub-channel 23 or the same second sub-channel 24. In particular, in the embodiment, the rhombus section of the heat exchange channel 11 is a rhombus with an included angle of 90°, that is, the projection of the heat exchange channel 11 on the section perpendicular to the length direction of the heat exchange core 1 is a square, and one diagonal of the square is perpendicular to the ground, and the other diagonal is parallel to the ground.
[0028] It can be understood that, when the micro-channel heat exchanger works, the first heat exchange medium is introduced into the heat exchange core 1 from the first inlet 21 of the distributor 2 at one end, and the second heat exchange medium is introduced into the heat exchange core 1 from the second inlet 22 of the distributor 2 at the other end. The first heat exchange medium sequentially passes through the first sub-channel 23, the outlet channel 25 communicated with the first sub-channel 23, and the heat exchange channel 11 communicated with the outlet channel 25, and then is discharged from the first inlet 21 of the heat exchanger at the other end. The second heat exchange medium sequentially passes through the second sub-channel 24, the outlet channel 25 communicated with the second sub-channel 24, and the heat exchange channel 11 communicated with the outlet channel 25, and then is discharged from the second inlet 22 of the heat exchanger where the first heat exchange medium is introduced, so as to realize the counter-flow heat exchange of the first heat exchange medium and the second heat exchange medium in the mutually isolated heat exchange channels 11. The above-mentioned first heat exchange medium and second heat exchange medium are respectively common media in different thermal management systems, such as water, condensate, refrigerant, etc., which will not be described here.
[0029] From a macro perspective, along the height direction of the heat exchange core 1, define the heat exchange channels 11 at the same height as a row of heat exchange channels 11, then the medium flowing in a row of heat exchange channels 11 is the same, and the first heat exchange medium and the second heat exchange medium in multiple rows of heat exchange channels 11 exchange heat in the vertical direction. From a micro perspective, by arranging the heat exchange channels 11 in a rhombus and honeycomb shape, the upper half of the first heat exchange medium in a single heat exchange channel 11 exchanges heat with the second heat exchange medium in the adjacent two heat exchange channels 11 in the previous row, and the lower half exchanges heat with the second heat exchange medium in the adjacent two heat exchange channels 11 in the next row. The first heat exchange medium in each heat exchange channel 11 can exchange heat with the second heat exchange medium in the adjacent four heat exchange channels 11 through the four side walls of the heat exchange channel 11, so that the first heat exchange medium and the second heat exchange medium are independently staggered in contact at a micro level, greatly increasing the heat exchange area, and the flow distribution is more uniform, without heat exchange dead zones, effectively improving the heat exchange efficiency. At the same time, the micro-channel heat exchanger mainly consists of two components, the heat exchange core 1 and the liquid distributor 2, which can simplify the structure of the micro-channel heat exchanger, facilitate the assembly and subsequent maintenance of the micro-channel heat exchanger.
[0030] It should be noted that the first heat exchange medium (or the second heat exchange medium) in the heat exchange channel 11 at the edge can only exchange heat with the two side walls, and the first heat exchange medium (or the second heat exchange medium) in the heat exchange channel 11 at the corner can only exchange heat with one side wall. Since the flow of the medium at the edge and corner is relatively small compared to the total flow, it will not affect the overall heat exchange efficiency. This is particularly noted to avoid misunderstanding.
[0031] Referring to FIGS. 1 to 3, Figure 1 and Figure 4 It can be understood that the heat exchange core 1 is an integral 3D printed part, the heat exchange core 1 includes a plurality of printed layers 12, the plurality of printed layers 12 are arranged and integrally formed along the length direction of the heat exchange core 1, the printed layer 12 is provided with a plurality of flow guide holes 121, the projection of the flow guide hole 121 on the cross section perpendicular to the thickness direction of the printed layer 12 is a rhombus, the plurality of flow guide holes 121 are arranged in a honeycomb shape, and the corresponding flow guide holes 121 on the plurality of printed layers 12 are sequentially connected to form the heat exchange channel 11. The heat exchange core 1 can be made of titanium alloy, stainless steel, aluminum alloy, cobalt-chromium alloy, etc. by 3D printing.
[0032] The heat exchange core 1 is integrally formed by using 3D metal printing technology. The production steps are simplified, the consistency of the heat exchange channel 11 is improved, and the production efficiency and structural stability of the heat exchange core 1 are effectively improved. The integrally formed heat exchange core 1 is divided into a plurality of printing layers 12. On the one hand, when the heat exchange core 1 is 3D printed, a printing layer 12 can be printed first, and then the printing operation is repeated to simplify the printer programming operation, so that the heat exchange core 1 is quickly formed, and the printing production cost of the heat exchange core 1 is reduced. On the other hand, by controlling the number of printing layers 12, the length of the heat exchange channel 11 and the overall size of the micro-channel heat exchanger can also be controlled, so as to adapt to different installation requirements of the micro-channel heat exchanger. The micro-channel heat exchanger can be used to replace the WCC (water chiller) and the Chiller (water chiller) at the same time, and the practicality of the micro-channel heat exchanger is effectively improved.
[0033] Referring to Figure 5 As shown in FIG. 1, it can be understood that the projection of the flow guide hole 121 on the cross section perpendicular to the width direction of the heat exchange core 1 is V-shaped. Specifically, the flow guide hole 121 includes a first hole section and a second hole section, and the first hole section and the second hole section are symmetrically arranged. One end of the first hole section forms a rhombic opening on one side of the printing layer 12, and the other end is inclined downward to the center of the thickness direction of the printing layer 12. One end of the second hole section is in communication with the first hole section at the center surface of the printing layer 12, and the other end is inclined upward and forms another rhombic opening on the other side of the printing layer 12. The two rhombic openings formed by the flow guide hole 121 are symmetrically located on the printing layer 12.
[0034] The cross section of the flow guide hole 121 is V-shaped, the heat exchange channel 11 formed by the plurality of flow guide holes 121 is Z-shaped folding, the heat exchange flow channel presents a space spiral effect, further increases the heat exchange area, significantly enhances the turbulent effect, has a destructive effect on the medium in the heat exchange flow channel, destroys the boundary layer of the medium, makes the heat flow inside the medium flow to the outside for heat exchange, strengthens the turbulent effect, and can reduce the volume while ensuring the same heat exchange amount ratio as the traditional heat exchanger. In addition, the Z-shaped folding heat exchange channel 11 is Z-shaped structure in each forward viewing angle direction, has a space folding characteristic form, and the structure of the heat exchange channel 11 has no cantilever and discontinuity in space, is easy to form from multiple directions, has good 3D printing forming effect, and the forming process is easy to implement and will not form a defect area.
[0035] Further, the included angle between the first hole section and the second hole section is 30°-150°, that is, the angle α of the V-shaped opening of the V-shaped flow guide hole 121 is 30°-150°. Exemplarily, the V-shaped opening of the flow guide hole 121 can be set to 60°, 90° or 120°, which will not be described here.
[0036] The heat exchange channel 11 is a "Z" shaped folded channel formed by a plurality of V-shaped flow guide holes 121. The opening angle a of a single V-shaped flow guide hole 121 directly determines the degree of tortuosity of the "Z" shaped heat exchange channel 11. The smaller the opening angle a of the flow guide hole 121, the greater the degree of tortuosity of the heat exchange channel 11. Conversely, the greater the opening angle a of the flow guide hole 121, the smaller the degree of tortuosity of the heat exchange channel 11. The opening angle a of the V-shaped flow guide hole 121 is limited to more than 30° to avoid excessive tortuosity of the heat exchange channel 11, too close distance between the peaks and valleys, and large flow resistance of the medium, which affects the flow of the medium. The opening angle a of the V-shaped flow guide hole 121 is limited to less than 150° to avoid the heat exchange channel 11 being too straight, making it difficult to form turbulent flow or the formed turbulent flow having low chaos degree (actual Reynolds number close to critical Reynolds number) and being easy to dissipate. By reasonably limiting the included angle between the first hole section and the second hole section, the development of the turbulent flow formed by the medium is ensured to be more sufficient, the laminar flow inside the medium is quickly turned out for heat exchange, and the structural rationality of the heat exchange channel 11 is improved.
[0037] Further, the wall thickness between adjacent two flow guide holes 121 is 0.2mm-2mm. Since the flow guide hole 121 is rhombic, the wall thickness d of the four sides (excluding the side wall of the flow guide hole 121 at the edge) of a single flow guide hole 121 is 0.2mm-2mm. For example, the wall thickness d of the flow guide hole 121 can be set to 1mm, 1.2mm or 1.5mm, and the like, which will not be described here.
[0038] The wall thickness d of the flow guide hole 121 is limited to more than 0.2mm to ensure that the printing layer 12 has a certain structural strength under the premise of arranging the honeycomb-shaped flow guide hole 121, and the flow guide hole 121 will not be easily deformed. The wall thickness d of the flow guide hole 121 is limited to less than 2mm to avoid excessive weight of the printing layer 12 and increase the load, and to avoid excessive wall thickness between adjacent two flow guide holes 121 affecting heat exchange. By reasonably limiting the wall thickness between adjacent two flow guide holes 121, the structure of the printing layer 12 is stable and the heat exchange effect is good.
[0039] It should be noted that in the present embodiment, the V-shaped cross section of the flow guide hole 121 is arranged to open upward. When the printing layer 12 is a square plate and the honeycomb-shaped flow guide holes 121 are also square as a whole, the V-shaped opening of the cross section of the flow guide hole 121 can be directed by rotating the printing layer 12 by 180° around the axis parallel to the thickness direction of the printing layer 12, and the "Z" shaped folded heat exchange channel 11 can also be formed subsequently. It is particularly noted that this will not be described hereinafter.
[0040] Further, the projection of the printing layer 13 on the projection plane perpendicular to the length direction of the heat exchange core 1 is rectangular, and the heat exchange core 1 is in the shape of a lying rectangular parallelepiped after printing.
[0041] The shape of the printing layer 13 is set as a rectangle, which facilitates the subsequent alignment and fixation of the heat exchange core 1 and the distributor 2, facilitates the demolding and taking out of the heat exchange core 1 in the printer, and further improves the production efficiency of the heat exchange core 1.
[0042] Further, the distributor 2 is made of the same material as the printing layer 12, and the distributor 2 is also a 3D printed alloy part.
[0043] The batch production of the distributor 2 through the 3D metal printing technology is simple in operation, high in consistency of the distributor 2, and effective in improving the production efficiency and structural stability of the distributor 2. On this basis, the heat exchange core 1 and the two distributors 2 can also be integrally formed by the 3D metal printing technology. At this time, the micro-channel heat exchanger has no intermediate welding point, which saves the disassembly and assembly steps and reduces the risk of leakage.
[0044] Referring to Figs. 1 and 2, Figure 2 , Figure 3 and Figure 6 , it can be understood that the opening of one end of the outlet channel 25 towards the heat exchange core 1 is in the shape of a rhombus matching the shape of the heat exchange channel 11, the opening of the other end of the outlet channel 25 away from the heat exchange core 1 is in the shape of a rectangle, and the rhombic opening and the rectangular opening of the outlet channel 25 are smoothly transitioned through an arc surface.
[0045] The opening of the other end of the outlet channel 25 away from the heat exchange core 1 is set as a rectangle, which is suitable for the horizontally arranged first sub-channel 23 (or the second sub-channel 24), reduces the overall height of the distributor 2, and ensures the mutual separation between the outlet channels 25. The rhombic opening and the rectangular opening of the two ends of the outlet channel 25 are smoothly transitioned through an arc surface, which reduces the flow resistance of the medium and can guide the spiral flow of the medium, further strengthening the turbulent effect in the heat exchange channel 11.
[0046] Referring to Figs. 1 and 2, Figure 1 , it can be understood that, along the width direction of the heat exchange core 1, the two side walls of the heat exchange core 1 are flush with the two side walls of the distributor 2.
[0047] The side walls of the heat exchange core 1 and the distributor 2 are set flush, which facilitates the initial positioning of the heat exchange core 1 and the distributor 2, and can limit the lateral size and the overall volume of the micro-channel heat exchanger.
[0048] Referring to Figs. 1 and 2, Figure 1 and Figure 6 , it can be understood that, along the length direction of the heat exchange core 1, the outer peripheral wall of the second inlet 22 protrudes from the side wall of the side of the distributor 2 towards the heat exchange core 1, and the part of the distributor 2 protruding from the second inlet 22 is in the shape of a plane and overlaps the heat exchange core 1.
[0049] The second inlet 22 is located at the top end of the distributor 2. By lengthening the length of the second inlet 22, the second inlet 22 can be overlapped with the top surface of the heat exchange core 1, the positioning of the distributor 2 in the vertical direction is realized, the positioning of the heat exchange core 1 and the two sides of the distributor 2 is matched, the overall alignment of the outlet channel 25 on the distributor 2 and the heat exchange channel 11 is realized, and the assembly efficiency of the micro-channel heat exchanger is improved.
[0050] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of the present application. Here, it is unnecessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.
Claims
1. A microchannel heat exchanger characterized by, The application relates to a heat exchange core (1) provided with a plurality of heat exchange channels (11) which are communicated with both sides of the heat exchange core (1) along the length direction of the heat exchange core (1), the projection of the heat exchange channel (11) on the cross section perpendicular to the length direction of the heat exchange core (1) is in the shape of a rhombus, and the plurality of heat exchange channels (11) are arranged in a honeycomb shape. Two distributors (2) are oppositely arranged and fixed to both sides of the heat exchange core (1) along the length direction of the heat exchange core (1), the bottom end of the distributor (2) is provided with a first inlet (21), the top end is provided with a second inlet (22), a plurality of first sub-channels (23) and a plurality of second sub-channels (24) are arranged in the distributor (2), the first sub-channels (23) and the second sub-channels (24) are arranged in a staggered manner along the vertical direction, the plurality of first sub-channels (23) are communicated with the first inlet (21), the plurality of second sub-channels (24) are communicated with the second inlet (22), the side of the distributor (2) facing the heat exchange core (1) is provided with outlet channels (25) arranged in a honeycomb shape, the outlet channels (25) and the heat exchange channels (11) are communicated one by one, and along the height direction of the heat exchange core (1), the outlet channels (25) at the same height in the honeycomb-shaped outlet channels (25) are communicated with the same first sub-channel (23) or the same second sub-channel (24). The heat exchange core (1) is an integrally-formed 3D printing part, the heat exchange core (1) comprises a plurality of printing layers (12), the plurality of printing layers (12) are arranged along the length direction of the heat exchange core (1), the printing layer (12) is provided with a plurality of flow guide holes (121), the plurality of flow guide holes (121) are arranged in a honeycomb shape, and the flow guide holes (121) corresponding in position on the plurality of printing layers (12) are communicated in sequence to form the heat exchange channels (11).
2. The micro-channel heat exchanger of claim 1, wherein, The projection of the flow guide hole (121) on the cross section perpendicular to the width direction of the heat exchange core (1) is in the shape of a V.
3. The micro-channel heat exchanger of claim 2, wherein, The flow guide hole (121) comprises a first hole section and a second hole section, the first hole section and the second hole section are arranged at an included angle and communicated with each other, and the included angle between the first hole section and the second hole section is 30-150 degrees.
4. The micro-channel heat exchanger of claim 3, wherein, The wall thickness between two adjacent flow guide holes (121) is 0.2-2 mm.
5. The micro-channel heat exchanger of claim 2, wherein, The projection of the printing layer (12) on the projection plane perpendicular to the length direction of the heat exchange core (1) is in the shape of a rectangle.
6. The microchannel heat exchanger of any of claims 2-5, wherein, The distributor (2) and the printing layer (12) are made of the same material, and the distributor (2) is also an integrally-formed 3D printing part.
7. The micro-channel heat exchanger of claim 2, wherein, Along the width direction of the heat exchange core (1), the side walls of the heat exchange core (1) on both sides are flush with the side walls of the distributor (2) on both sides.
8. The micro-channel heat exchanger of claim 1, wherein, Along the length direction of the heat exchange core (1), the outer peripheral wall of the second inlet (22) protrudes from the side wall of the distributor (2) on the side facing the heat exchange core (1) and is lapped on the heat exchange core (1).
9. The micro-channel heat exchanger of claim 1 or 8, wherein, 10. The micro-channel heat exchanger of claim 1, wherein, The outlet channel (25) is in the shape of a rhombus matching the shape of the heat exchange channel (11) at the end opening towards the heat exchange core (1), and is in the shape of a rectangle at the end opening away from the heat exchange core (1), and the rhombic opening of the outlet channel (25) and the rectangular opening of the outlet channel (25) are smoothly connected by an arc surface.