Multi-medium microchannel heat exchanger

Abstract

The present application provides a multi-medium microchannel heat exchanger, comprising a parallel flow flat tube set and a folding flat tube set. The parallel flow flat tube set comprises a plurality of spaced parallel flow flat tubes, each parallel flow flat tube is provided with a plurality of second sub-flow paths arranged at intervals, and the second sub-flow paths extend in the length direction of the parallel flow flat tube; the folding flat tube set comprises a plurality of spaced folding flat tubes, the plurality of folding flat tubes extend in the length direction of the parallel flow flat tube set, each folding flat tube comprises a cavity and a blocking member, the blocking member is located in the cavity, and the blocking member divides the cavity into a plurality of spaced first sub-flow paths; the plurality of parallel flow flat tubes and the plurality of folding flat tubes are arranged alternately, any parallel flow flat tube is attached to one adjacent folding flat tube, and is spaced from another adjacent folding flat tube; and any folding flat tube is attached to one adjacent parallel flow flat tube, and is spaced from another adjacent parallel flow flat tube. According to the technical solution provided by the present application, the heat exchange effect of the multi-medium microchannel heat exchanger is improved.

Description

Multi-media microchannel heat exchanger

[0001] This application claims priority to the patent application entitled “Multi-media Microchannel Heat Exchanger” with application number 202311246267.4, filed with the State Intellectual Property Office of China on September 25, 2023. Technical Field

[0002] The present application relates to the technical field of heat exchangers, and in particular to a multi-media microchannel heat exchanger. Background Art

[0003] The three-medium microchannel heat exchanger in the prior art is usually provided with two horizontal flat tube groups with the same structural dimensions, resulting in average heat exchange efficiency of the three-medium microchannel heat exchanger and uneven heat exchange between two adjacent horizontal flat tube groups.

[0004] Summary of the Invention

[0005] The present application provides a multi-media microchannel heat exchanger to improve the heat exchange effect of the multi-media microchannel heat exchanger.

[0006] In order to achieve the above-mentioned objectives, the present application provides a multi-media microchannel heat exchanger, which includes: a horizontal flat tube group, including a plurality of spaced horizontal flat tubes, the horizontal flat tubes having a plurality of spaced second sub-flow paths, and the second sub-flow paths extending along the length direction of the horizontal flat tubes; a folded flat tube group, including a plurality of spaced folded flat tubes, the plurality of folded flat tubes all extending along the length direction of the horizontal flat tube group, the folded flat tubes including a cavity and a barrier, the barrier being located in the cavity, and the barrier dividing the cavity into a plurality of spaced first sub-flow paths; wherein, the plurality of horizontal flat tubes and the plurality of folded flat tubes are alternately arranged, any one horizontal flat tube is arranged in contact with an adjacent one of the folded flat tubes and is spaced from another adjacent one of the folded flat tubes, and any one folded flat tube is arranged in contact with an adjacent one of the horizontal flat tubes and is spaced from another adjacent one of the horizontal flat tubes.

[0007] Furthermore, the multi-media microchannel heat exchanger also includes multiple fins, and any two bonded horizontal flat tubes and folded flat tubes form a heat exchange group. A fin is bonded on both sides of any heat exchange group, and the fins are arranged in a wave shape and have multiple sub-channels spaced along the length direction.

[0008] Furthermore, the multi-media microchannel heat exchanger also includes two first headers and two second headers, the two first headers are respectively arranged at the two ends of the multiple horizontal flat tubes and are connected through the multiple horizontal flat tubes, and the two second headers are respectively arranged at the two ends of the multiple folded flat tubes and are connected through the multiple folded flat tubes.

[0009] Furthermore, the two first manifolds each include a first inlet pipe for the first circulating medium to flow in and a first outlet pipe for the first circulating medium to flow out, and the two second manifolds each include a second inlet pipe for the second circulating medium to flow in and a second outlet pipe for the second circulating medium to flow out, the first inlet pipe and the second outlet pipe are arranged on the same side, and the first outlet pipe and the second inlet pipe are arranged on the other side, so that the flow directions of the first circulating medium and the second circulating medium are opposite.

[0010] Furthermore, both ends of the plurality of flat flow tubes have a first bending section, which extends away from the length direction of the flat flow tubes. The first bending sections at both ends of the flat flow tubes have the same or opposite bending directions, and the two first collecting pipes are respectively connected to the multiple first bending sections on the same side. And / or, both ends of the plurality of folded flat tubes have a second bending section, which extends away from the length direction of the folded flat tubes. The second bending sections at both ends of the folded flat tubes have the same or opposite bending directions, and the two second collecting pipes are respectively connected to the multiple second bending sections on the same side. The first collecting pipe and the second collecting pipe on the same side are separated by the first bending section and / or the second bending section.

[0011] Furthermore, one end of each of the plurality of horizontal flat tubes has a first bending section, which extends away from the length direction of the horizontal flat tubes; the other end of each of the plurality of folded flat tubes has a second bending section, which extends away from the length direction of the folded flat tubes; the two first collecting pipes are respectively connected to the plurality of first bending sections and the other ends of the plurality of horizontal flat tubes; the two second collecting pipes are respectively connected to the plurality of second bending sections and the other ends of the plurality of folded flat tubes; the first collecting pipe and the second collecting pipe on the same side are separated by the first bending section or the second bending section.

[0012] Furthermore, the radius of the first header is R1, the radius of the second header is R2, the width of the first bending section or the second bending section is T, and the bending angle of the first bending section and / or the second bending section is θ; or

[0013] Furthermore, the folded flat tube includes a winding section and a tube wall section that are interconnected. The tube wall section is arranged to form a cavity. The tube wall section is arranged around the winding section. The winding section extends along the length direction of the folded flat tube and has multiple recesses along the width direction of the folded flat tube. The multiple recesses and the inner wall of the tube wall section form multiple first sub-flow paths.

[0014] Furthermore, the plurality of first sub-flow paths are spaced apart along the width direction of the folded flat tube, the plurality of second sub-flow paths are spaced apart along the width direction of the flat flow flat tube, and the center lines of the plurality of first sub-flow paths and the center lines of the plurality of second sub-flow paths are alternately distributed in the width direction of the flat flow flat tube and / or the folded flat tube.

[0015] Furthermore, at least one end of the folded flat tube has a second bending section, which extends away from the length direction of the folded flat tube. The second bending section has a bending starting end away from the second collecting pipe, and the winding section extends along the length direction of the folded flat tube to the bending starting end.

[0016] Furthermore, the width of the flat flow tube is equal to the width of the folded flat tube, the first sub-flow path is provided with N, the second sub-flow path is provided with M, N <M<2N-1。

[0017] Furthermore, the sheet material of the folded flat tube is formed by stacking multiple layers of double-sided composite aluminum foil.

[0018] Furthermore, the horizontal flat tube group, the folded flat tube group and the plurality of fins are connected by brazing.

[0019] By applying the technical solution of the present application, a multi-media microchannel heat exchanger is provided, which includes: a horizontal flat tube group, including a plurality of spaced horizontal flat tubes, each of the horizontal flat tubes having a plurality of spaced second sub-flow paths, the second sub-flow paths extending along the length direction of the horizontal flat tubes; a folded flat tube group, including a plurality of spaced folded flat tubes, each of the plurality of folded flat tubes extending along the length direction of the horizontal flat tube group, the folded flat tube including a cavity and a barrier, the barrier being located in the cavity, the barrier dividing the cavity into a plurality of spaced first sub-flow paths; wherein the plurality of horizontal flat tubes and the plurality of folded flat tubes are alternately arranged, any one horizontal flat tube is arranged in contact with an adjacent one of the folded flat tubes and is spaced from another adjacent one of the folded flat tubes, and any one folded flat tube is arranged in contact with an adjacent one of the horizontal flat tubes and is spaced from another adjacent one of the horizontal flat tubes.

[0020] This multi-media microchannel heat exchanger utilizes a combination of horizontal and folded flat tubes to achieve multi-media heat exchange. Specifically, the spaced intervals between the horizontal and folded flat tubes are used to circulate a third medium (such as air). Three-medium microchannel heat exchange is achieved by flowing the first medium in the second sub-flow path of the horizontal flat tubes, the second medium in the first sub-flow path of the folded flat tubes, and the third medium in the spaced intervals. Compared to conventional heat exchangers in which all heat exchange tubes are horizontal flat tubes, this solution utilizes different internal flow paths (first sub-flow paths) and internal flow paths (second sub-flow paths) of the folded flat tubes. This allows for adjustable heat exchange between the horizontal and folded flat tubes, facilitating heat exchange tailored to actual conditions and improving heat exchange efficiency. The multiple first sub-flow paths of the folded flat tubes increase the heat exchange area between the second medium flowing through them, the first medium flowing through the adjacent second sub-flow paths, and the third medium flowing through the adjacent spaced intervals, thereby enhancing heat exchange effectiveness. Furthermore, the third circulating medium in the spacer area allows for the recovery and reuse of the cooling or heat dissipated by the first and second circulating media after heat exchange, reducing the use of auxiliary heat exchange agents such as refrigerants and saving heat exchange costs. Furthermore, by using a barrier to divide the cavity of the folded flat tube into multiple, spaced-apart first sub-flow paths, the heat exchange area of ​​the folded flat tube can be adjusted by controlling the structure of the barrier, thereby adjusting the heat exchange effect between the horizontal flat tube and the circulating medium within the folded flat tube, further improving the heat exchange efficiency of the multi-media microchannel heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0022] FIG1 shows a schematic structural diagram of a multi-media microchannel heat exchanger provided in Example 1 of the present application;

[0023] FIG2 shows a partial enlarged view of the multi-media microchannel heat exchanger of FIG1 ;

[0024] FIG3 shows a schematic structural diagram of the folded flat tubes in the multi-media microchannel heat exchanger of FIG1 ;

[0025] FIG4 shows a schematic diagram of the plate structure of the folded flat tube of FIG3 ;

[0026] FIG5 shows a side view of the multi-media microchannel heat exchanger of FIG1 ;

[0027] FIG6 shows a partial side view of the multi-media microchannel heat exchanger provided in Example 6 of the present application;

[0028] FIG7 shows a side view of the multi-media microchannel heat exchanger provided in Example 2 of the present application;

[0029] FIG8 shows a side view of the multi-media microchannel heat exchanger provided in Example 3 of the present application;

[0030] FIG9 shows a side view of the multi-media microchannel heat exchanger provided in Example 4 of the present application;

[0031] FIG10 shows a side view of the multi-media microchannel heat exchanger provided in Example 5 of the present application.

[0032] The above drawings include the following reference numerals:

[0033] 10. Flat flow flat tube group; 11. First collecting pipe; 12. Flat flow flat tube; 121. First bending section;

[0034] 20. Folded flat tube group; 21. Second manifold; 22. Folded flat tube; 221. Second bending section; 222. First sub-flow path; 223. Winding section; 224. Tube wall section; 225. Flat tube base layer; 226. Composite layer;

[0035] 30. Fin; 31. Sub-flow channel. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0037] As shown in Figures 1 to 10, an embodiment of the present application provides a multi-media microchannel heat exchanger, which includes: a horizontal flat tube group 10, including a plurality of spaced horizontal flat tubes 12, each of which has a plurality of spaced second sub-flow paths, each of which extends along the length of the horizontal flat tube 12; a folded flat tube group 20, including a plurality of spaced folded flat tubes 22, each of which extends along the length of the horizontal flat tube group 10, and each of which includes a cavity and a barrier, the barrier being located in the cavity, and dividing the cavity into a plurality of spaced first sub-flow paths 222; wherein the plurality of horizontal flat tubes 12 and the plurality of folded flat tubes 22 are alternately arranged, and any horizontal flat tube 12 is arranged in contact with an adjacent folded flat tube 22 and is spaced from another adjacent folded flat tube 22, and any folded flat tube 22 is arranged in contact with an adjacent horizontal flat tube 12 and is spaced from another adjacent horizontal flat tube 12. The plurality of flat flat tubes 12 are configured to circulate a first medium and extend along the length of the flat flat tube group 10 . The plurality of folded flat tubes 22 are configured to circulate a second medium. Specifically, the plurality of first sub-flow paths 222 are configured to circulate the second medium, and the plurality of second sub-flow paths are configured to circulate the first medium.

[0038] In this embodiment, the multi-media microchannel heat exchanger uses the cooperation of the horizontal flat tube group 10 and the folded flat tube group 20 to achieve multi-media heat exchange. Specifically, the spacing area formed between the mutually spaced horizontal flat tubes 12 and the folded flat tubes 22 is used to circulate a third circulating medium (fluid such as air). The first circulating medium flowing through the second sub-flow path of the horizontal flat tube 12, the second circulating medium flowing through the first sub-flow path 222 of the folded flat tube 22, and the third circulating medium flowing through the spacing area realize three-medium microchannel heat exchange. Compared to conventional heat exchangers in which all heat exchange flat tubes utilize horizontal flat tubes 12, this embodiment utilizes a different structure for the internal flow channels (first sub-flow channels 222) of the folded flat tubes 22 than for the internal flow channels (second sub-flow channels) of the horizontal flat tubes 12. This allows for adjustable heat exchange between the horizontal flat tubes 12 and the folded flat tubes 22, facilitating heat exchange tailored to actual conditions and improving heat exchange efficiency. The multiple first sub-flow channels 222 of the folded flat tubes 22 increase the heat exchange area between the second medium flowing through them, the first medium flowing through the adjacent second sub-flow channels, and the third medium flowing through the adjacent spacing regions. Furthermore, the third medium in the spacing regions allows for the recovery and reuse of the cooling or heat dissipated by the first and second media after heat exchange, reducing the use of auxiliary heat exchange agents such as refrigerants and saving heat exchange costs. At the same time, a barrier is used to divide the cavity of the folded flat tube 22 into a plurality of spaced first sub-flow paths 222. By controlling the structure of the barrier, the heat exchange area of ​​the folded flat tube 22 can be adjusted, and the heat exchange between the horizontal flat tube 12 and the medium flowing inside the folded flat tube 22 can be adjusted, thereby further improving the heat exchange efficiency of the heat exchanger.

[0039] As shown in Figures 1 and 2, the multi-media microchannel heat exchanger also includes multiple fins 30. Any two aligned flat tubes 12 and folded flat tubes 22 form a heat exchange group. Each heat exchange group has a fin 30 attached to both sides. The fins 30 are arranged in a wavy pattern and have multiple sub-channels 31 spaced apart along their lengths. These sub-channels 31 are used to circulate the third medium. This arrangement further increases the heat exchange area between the third medium and the first and second media, thereby enhancing the heat exchange efficiency of the multi-media microchannel heat exchanger. Specifically, the fins 30 have a serpentine fin structure.

[0040] As shown in Figures 1 and 5, the multi-media microchannel heat exchanger further includes two first manifolds 11 and two second manifolds 21. The two first manifolds 11 are respectively disposed at the ends of the plurality of horizontal flat tubes 12 and communicate through the plurality of horizontal flat tubes 12. The two second manifolds 21 are respectively disposed at the ends of the plurality of folded flat tubes 22 and communicate through the plurality of folded flat tubes 22. This arrangement facilitates the flow of the first circulating medium into and out of the plurality of horizontal flat tubes 12, and the flow of the second circulating medium into and out of the plurality of folded flat tubes 22. The first manifolds 11 and the second manifolds 21 are respectively connected to portions of the flow system where different fluids flow, thereby enabling heat exchange between the two different fluids. Furthermore, in this embodiment, the entire horizontal flat tube assembly 10, the entire folded flat tube assembly 20, and the plurality of fins 30 are plugged together before welding, which simplifies positioning and connection, and also facilitates the processing of the individual structures and subsequent welding operations after plugging together.

[0041] Optionally, the multi-media microchannel heat exchanger further includes two mounting plates, which are respectively arranged on the sides of the two fins 30 located at the ends facing away from each other to ensure the reliability of the installation of the two fins 30 located at the ends.

[0042] In this embodiment, both first manifolds 11 include a first inlet pipe for the inflow of a first circulating medium and a first outlet pipe for the outflow of the first circulating medium. Both second manifolds 21 include a second inlet pipe for the inflow of a second circulating medium and a second outlet pipe for the outflow of the second circulating medium. The first inlet pipe and the second outlet pipe are arranged on the same side, while the first outlet pipe and the second inlet pipe are arranged on the opposite side, so that the flow directions of the first and second circulating media are opposite. This arrangement allows the first circulating medium to enter the plurality of flat flat tubes 12 from the first inlet pipe and exit from the first outlet pipe, while the second circulating medium enters the plurality of folded flat tubes 22 from the second inlet pipe and exits from the second outlet pipe. The two media flow in opposite and relative directions, which facilitates enhanced heat exchange between the media and ensures efficient heat exchange.

[0043] Specifically, both ends of the plurality of flat flow tubes 12 have a first bend section 121, which extends away from the length direction of the flat flow tubes 12. The first bend sections 121 at both ends of the flat flow tubes 12 have the same or opposite bending directions, and the two first headers 11 are respectively connected to the plurality of first bend sections 121 on the same side. And / or, both ends of the plurality of folded flat tubes 22 have a second bend section 221, which extends away from the length direction of the folded flat tubes 22. The second bend sections 221 at both ends of the folded flat tubes 22 have the same or opposite bending directions, and the two second headers 21 are respectively connected to the plurality of second bend sections 221 on the same side. The first header 11 and the second header 21 on the same side are separated by the first bend section 121 and / or the second bend section 221.

[0044] In the first embodiment shown in Figures 1 to 5 , the first bend sections 121 are not provided at both ends of the plurality of flat flow tubes 12. Instead, the second bend sections 221 are provided at both ends of the plurality of folded flat tubes 22. The second bend sections 221 at both ends of the folded flat tubes 22 have the same bending direction, and the first header 11 and the second header 21 on the same side are separated by the first bend section 121. The arrangement of the bend sections is not limited to the embodiment shown in Figure 5 . While ensuring the spacing between the first header 11 and the second header 21 on the same side, the first bend section 121 and / or the second bend section 221 can be provided and the bending directions of the bend sections can be adjusted according to actual conditions.

[0045] As shown in Figure 7, Example 2 of the present application provides a multi-media microchannel heat exchanger. The difference from Example 1 is that in this embodiment, both ends of the multiple horizontal flat tubes 12 have a first bending section 121, and the first bending sections 121 at both ends of the horizontal flat tubes 12 have the same bending direction. The two ends of the multiple folded flat tubes 22 are not provided with second bending sections 221, and the first collecting pipe 11 and the second collecting pipe 21 located on the same side are separated by the second bending section 221.

[0046] As shown in Figure 8, the third embodiment of the present application provides a multi-media microchannel heat exchanger, which is different from the first embodiment in that, in this embodiment, both ends of the plurality of horizontal flat tubes 12 have a first bending section 121, and the first bending sections 121 at both ends of the horizontal flat tubes 12 have the same bending direction, and both ends of the plurality of folded flat tubes 22 have a second bending section 221, and the second bending sections 221 at both ends of the folded flat tubes 22 have the same bending direction, and the bending directions of the first bending section 121 and the second bending section 221 are opposite, and the first manifold 11 and the second manifold 221 located on the same side are opposite. The tubes 21 are separated by the first bending section 121 and the second bending section 221. Based on this, it can be understood that in another embodiment not shown in the figures, both ends of the plurality of flat flow tubes 12 have a first bending section 121, and the first bending sections 121 at both ends of the flat flow tubes 12 have the same bending direction. Both ends of the plurality of folded flat tubes 22 have a second bending section 221, and the second bending sections 221 at both ends of the folded flat tubes 22 have the same bending direction. The difference between this embodiment and the third embodiment is that the first bending section 121 and the second bending section 221 have the same bending direction.

[0047] This arrangement prevents interference and collision between the first and second headers 11, 21 located on the same side when connecting the flat flow flat tube group 10 and the folded flat tube group 20, which could result in a connection failure. This ensures the reliability of the multi-media microchannel heat exchanger. Furthermore, the provision of the first bend section 121 and / or the second bend section 221 increases the heat exchange area between the first and second circulating media, thereby improving the heat exchange efficiency between the first and second circulating media.

[0048] It should be noted that the arrangement of the multiple first bending sections 121 and the multiple second bending sections 221 is not limited to the above embodiment. The arrangement of the multiple first bending sections 121 and the multiple second bending sections 221 also includes: one end of the multiple horizontal flat tubes 12 all has a first bending section 121, the other end of the multiple folded flat tubes 22 all has a second bending section 221, the two first headers 11 are respectively connected to the multiple first bending sections 121 and the other ends of the multiple horizontal flat tubes 12, and the two second headers 21 are respectively connected to the multiple second bending sections 221 and the other ends of the multiple folded flat tubes 22. The first header 11 and the second header 21 on the same side are separated by the first bending section 121 or the second bending section 221, and the bending direction of the first bending section 121 and the bending direction of the second bending section 221 can be the same or opposite.

[0049] As shown in Figure 9, the fourth embodiment of the present application provides a multi-media microchannel heat exchanger. The difference from the above embodiment is that, in this embodiment, the lower ends of the plurality of horizontal flat tubes 12 all have a first bending section 121, and the upper ends are not provided with the first bending section 121. The upper ends of the plurality of folded flat tubes 22 all have a second bending section 221, and the lower ends are not provided with the second bending section 221. The first manifold 11 located on the upper side is separated from the second manifold 21 by the second bending section 221, and the first manifold 11 located on the lower side is connected to the second manifold 21. Based on this, it can be understood that in another embodiment shown in the figure, the upper ends of the plurality of horizontal flat tubes 12 all have the first bending section 121, and the lower ends are not provided with the first bending section 121; the lower ends of the plurality of folded flat tubes 22 all have the second bending section 221, and the upper ends are not provided with the second bending section 221; the first collecting pipe 11 and the second collecting pipe 21 located on the upper side are separated by the first bending section 121, and the first collecting pipe 11 and the second collecting pipe 21 located on the lower side are separated by the second bending section 221.

[0050] This arrangement can also avoid interference and collision between the first header 11 and the second header 21 located on the same side when the horizontal flat tube group 10 and the folded flat tube group 20 are connected, resulting in a connection failure, thereby ensuring the reliability of the multi-media microchannel heat exchanger.

[0051] Optionally, on the basis of ensuring that interference and collision between the first collecting pipe 11 and the second collecting pipe 21 located on the same side, which may lead to connection failure, can be avoided when the horizontal flat tube group 10 and the folded flat tube group 20 are connected, the arrangement method of the multiple first bending sections 121 and the multiple second bending sections 221 also includes: the lower ends of the multiple horizontal flat tubes 12 all have the first bending section 121, the upper ends all have the first bending section 121, and one of the upper and lower ends of the multiple folded flat tubes 22 has the second bending section 221, and the other end does not have the second bending section 221; or, the lower ends of the multiple folded flat tubes 22 all have the second bending section 221, the upper ends all have the second bending section 221, and one of the upper and lower ends of the multiple horizontal flat tubes 12 has the first bending section 121, and the other end does not have the first bending section 121.

[0052] As shown in Figure 10, Example 5 of the present application provides a multi-media microchannel heat exchanger, which is different from the above embodiments in that, in this embodiment, the lower ends of multiple horizontal flat tubes 12 all have a first bending section 121, and the upper ends all have a first bending section 121, the lower ends of multiple folded flat tubes 22 all have a second bending section 221 and the upper ends do not have the second bending section 221, the first collecting pipe 11 and the second collecting pipe 21 located on the upper side are separated by the first bending section 121, and the first collecting pipe 11 and the second collecting pipe 21 located on the lower side are separated by the first bending section 121 and the second bending section 221.

[0053] Among them, the folded flat tube 22 has better ductility than the horizontal flat tube 12. Preferably, both ends of the multiple folded flat tubes 22 have a second bending section 221, and the multiple horizontal flat tubes 12 do not have a first bending section. While ensuring the spacing between the first collecting pipe 11 and the second collecting pipe 21, the structural strength of the multi-media microchannel heat exchanger can be better guaranteed.

[0054] In this embodiment, the radius of the first manifold 11 is R1, the radius of the second manifold 21 is R2, the width of the first bending section 121 or the second bending section 221 is T, and the bending angle of the first bending section 121 and / or the second bending section 221 is θ. or This arrangement ensures the reliability of the spacing between the first manifold 11 and the second manifold 21 located on the same side without affecting the flow of the first circulating medium and / or the second circulating medium. The above formula is used to define the minimum value of θ, which is beneficial to ensuring the compactness of the overall structure of the multi-media microchannel heat exchanger and facilitating the bending of the horizontal flat tubes or the folded flat tubes.

[0055] As shown in FIG6 , the sixth embodiment of the present application provides a multi-media microchannel heat exchanger. The difference between this embodiment and the first embodiment is that the first header 11 and the second header 21 on the same side of the sixth embodiment are tangent to the same surface in the thickness direction of the flat tube group. The folded flat tube 22 in this embodiment is bent to form a second bent section 221, and the flat flow flat tube 12 is not bent. It is suitable for It is understood that in another embodiment in which the only difference from the sixth embodiment is that the flat tube 12 is bent to form the first bending section 121 and the folded flat tube 22 is not bent, the following can be applied: The parameters in the formula can be adaptively adjusted according to actual conditions, and examples are not given here one by one.

[0056] In the embodiment shown in Figure 5 , the multiple folded flat tubes 22 all have a second bend section 221. The multiple first bend sections 121 on both sides all bend in the same direction. The multiple flat flow flat tubes 12 do not have a first bend section 121, and the second bend sections 221 have a bend angle θ of 90°. The angle of the bend section is not limited to the embodiment shown in Figure 5 . While ensuring the spacing between the first and second headers 11, 21 on the same side, the angle θ of the bend section can be adjusted based on actual conditions. It should be understood that the first and second headers 11, 21 on the same side can be arranged flush (with the axes of the two headers lying in the same plane and perpendicular to the surface of the flat tube group) or staggered along the length of the flat tube group (with the axes of the two headers staggered along the length of the flat tube group, one on the inside and one on the outside). Preferably, the first collecting pipe 11 having the first bending section 121 and / or the second collecting pipe 21 having the second bending section 221 are connected on the inner side. This arrangement can effectively avoid the situation where the length difference between the folded flat tubes 22 and the flat flow tubes 12 is large, which affects the heat recovery efficiency of the multi-media microchannel heat exchanger.

[0057] In this embodiment, both the first bend section 121 and the second bend section 221 bend along the width direction of the flat tube assembly 10 and / or the folded flat tube assembly 20. Taking the first bend section 121 as an example, when 0 ≤ θ ≤ 90°, the flow direction of the first circulating medium within the first bend section 121 is the same as or perpendicular to the flow direction within the main body of the flat tube 12 (perpendicular at 90°). When θ = 0°, the first bend section 121 extends in the same direction as the main body of the flat tube 12. If the bend angle of the first bend section 121 is greater than 90°, the flow direction of the first circulating medium within the first bend section 121 may be opposite to the flow direction within the main body of the flat tube 12, resulting in obstructed flow or stagnation of the first circulating medium within the first bend section 121. The same applies to the second bend section 221.

[0058] Furthermore, the first bending section 121 and the second bending section 221 are mainly used to connect the first collecting pipe 11 and the second collecting pipe 21. Both ends of the fin 30 do not extend to the first bending section 121 and the second bending section 221. Therefore, the first bending section 121 and the second bending section 221 themselves cannot play a heat exchange role or the heat exchange effect they can play is very small. Considering this factor, the lengths of the first bending section 121 and the second bending section 221 are as short as possible.

[0059] Preferably, as shown in FIG3 , in this embodiment, the folded flat tube 22 is formed by folding a single plate material.

[0060] Specifically, the folded flat tube 22 includes a serpentine section 223 and a wall section 224 that are interconnected. The wall section 224 encloses a cavity and surrounds the serpentine section 223. The serpentine section 223 serves as a barrier and extends along the length of the folded flat tube 22. It also has multiple recesses along the width of the folded flat tube 22. These recesses and the inner wall of the wall section 224 surround and form multiple first sub-flow paths 222. This arrangement ensures the structural strength and ductility of the folded flat tube 22 while facilitating the formation of multiple, spaced-apart first sub-flow paths 222.

[0061] The second bend section 221 has a bend-starting end that is distal to the second manifold 21, and the serpentine section 223 extends along the length of the folded flat tube 22 to the bend-starting end. In this embodiment, the serpentine section 223 of the folded flat tube 22 does not extend into the second bend section 221. That is, the end of the first sub-flow path 222 does not extend into the second bend section 221, and no microchannels are formed within the second bend section 221, facilitating the bending of the second bend section 221. Furthermore, the second bend section 221 of the folded flat tube 22 is configured such that the tube wall section 224 of the folded flat tube 22 bends and deforms, causing the folded flat tube 22 to deform within the second bend section 221. This facilitates uniform distribution of the second circulating medium and improves heat exchange efficiency.

[0062] In this embodiment, multiple first sub-flow paths 222 are spaced apart along the width of the folded flat tubes 22, and multiple second sub-flow paths are spaced apart along the width of the flattened flat tubes 12. The centerlines of the multiple first sub-flow paths 222 and the centerlines of the multiple second sub-flow paths alternate along the width of the flattened flat tubes 12 and / or the folded flat tubes 22. This arrangement allows any one first sub-flow path to correspond to two second sub-flow paths, and / or any one second sub-flow path to correspond to two first sub-flow paths, further improving the heat exchange efficiency between the first and second circulating media. Specifically, the cross-sectional shapes of the first and second sub-flow paths 222 can be adjusted according to actual circumstances, and are not exemplified here.

[0063] Specifically, the width of the flat flow tube 12 is equal to the width of the folded flat tube 22. There are N first sub-flow paths 222 and M second sub-flow paths, where N < M < 2N - 1. This setting helps ensure that the centerlines of the multiple first sub-flow paths 222 and the centerlines of the multiple second sub-flow paths are alternately distributed in the width direction of the flat flow tube 12 and / or the folded flat tube 22, guaranteeing the heat exchange effect of the multi-media microchannel heat exchanger. At the same time, the number of the first sub-flow paths 222 is less than the number of the second sub-flow paths, thus making the flow areas of the flat flow tube 12 and the folded flat tube 22 different and improving the heat exchange efficiency. Limiting the number of the second sub-flow paths to less than 2N - 1 and limiting the folded flat tube 22 to a fixed width dimension can effectively avoid situations that are not conducive to heat exchange, such as setting too many second sub-flow paths and increasing the flow resistance of the heat exchange medium.

[0064] In this embodiment, the purpose of the combined setting of the folded flat tube 22 and the flat flow tube 12 is that different media flow through the two flat tubes. For example, in one embodiment, water flows through the folded flat tube 22 and fluorine flows through the flat flow tube 12. Specifically, the heat exchange effect or heat exchange capacity of the multi-media microchannel heat exchanger is related to the volume of the flat tube and the specific heat capacity of the medium flowing through the flat tube. Since the specific heat capacities of the media flowing through the two flat tubes are different, the operator can appropriately adjust the volume ratio of the two flat tubes according to the selected heat exchange medium to achieve an ideal heat exchange effect. Optionally, the volume of the folded flat tube 22 in this embodiment is adjustable to cope with media with different specific heat capacities and the volume of the flat flow tube 12, which is beneficial to improving the heat exchange efficiency.

[0065] Furthermore, the most ideal state between the flat flow tube 12 and the folded flat tube 22 is to match the volumes of the second sub-flow paths of two fitting flat flow tubes 12 and the volumes of the first sub-flow paths 222 of the folded flat tube 22 according to the different specific heat capacities of the media flowing through the two flat tubes, so as to achieve the optimal heat exchange. That is to say, the flat flow tube 12 and the folded flat tube 22 are combinedly set, and the folded flat tube 22 can flexibly adjust the volume of the first sub-flow paths 222 to cope with the volumes of various flat flow tubes 12, thereby improving the heat exchange efficiency.

[0066] In this embodiment, the relationship between the first volume of the flat flow tube 12 and the second volume of the folded flat tube 22 can be judged according to the different media flowing through the two flat tubes. For example, when the two media are determined and the first volume is greater than the second volume, whether the heat recovery will be more sufficient. Among them, the calculation formula for the specific heat capacity of the medium is Q = cm(t1 - t2).

[0067] As shown in Figures 3 and 4 , the sheet material of the folded flat tube 22 is formed by stacking multiple layers of double-sided composite aluminum foil. In this embodiment, the folded flat tube 22 is formed by stacking three layers of double-sided composite aluminum foil. The center layer is the flat tube base layer 225, and the composite layers 226 are arranged on both sides of the flat tube base layer 225. The central portion of the composite layer 226 can be made of a corrosion-resistant alloy with high corrosion resistance, thereby improving the corrosion resistance of the folded flat tube 22 and thereby extending the service life of the multi-media microchannel heat exchanger. Alternatively, the composite layer 226 can be directly made of solder, which not only improves corrosion resistance but also lowers the melting point of the weld between the folded flat tube 22 and the fins 30 or the flat flat tube 12. This makes the multi-media microchannel heat exchanger easier to manufacture, facilitates welding, and reduces processing costs. Furthermore, compared with the horizontal flat tube 12 (extruded flat tube) in the prior art, which has a single component and is prone to electrochemical corrosion, the zinc layer covering the surface of the flat tube is difficult to ensure uniformity, and in the natural corrosion process, it is easy to cause pitting of the flat tube, resulting in perforation of the flat tube. The folded flat tube 22 composed of three layers of double-sided composite aluminum foil stacked in this embodiment is less likely to be locally corroded, so the probability of flat tube perforation and fin 30 falling off is reduced, thereby improving the actual performance and life of the multi-media microchannel heat exchanger.

[0068] Optionally, during the production of the folded flat tube 22 , the aluminum material does not need to be heated at high temperature, and the production energy consumption is much lower than that of the traditional extruded flat tube. The amount of flux used and the amount of residue during the production and processing are less, which is more environmentally friendly.

[0069] Specifically, the flat tube group 10, the folded flat tube group 20 and the plurality of fins 30 are brazed together. This arrangement allows the flat tube group 10, the folded flat tube group 20 and the plurality of fins 30 to be connected together before brazing, making the connection simpler and more convenient.

[0070] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0071] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0072] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0073] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0074] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0075] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A multi-media microchannel heat exchanger, characterized in that: The multi-media microchannel heat exchanger comprises: A flat flow tube group (10) comprising a plurality of spaced flat flow tubes (12), wherein the flat flow tubes (12) have a plurality of spaced second sub-flow paths, and the second sub-flow paths extend along the length direction of the flat flow tubes (12); A folded flat tube group (20), comprising a plurality of spaced folded flat tubes (22), wherein the plurality of folded flat tubes (22) are all arranged to extend along the length direction of the flat flow tube group (10), wherein the folded flat tubes (22) comprise a cavity and a barrier, wherein the barrier is located in the cavity, and the barrier divides the cavity into a plurality of spaced first sub-flow paths (222); Wherein, a plurality of the horizontal flat tubes (12) and a plurality of the folded flat tubes (22) are arranged alternately, any one of the horizontal flat tubes (12) is arranged in close contact with an adjacent one of the folded flat tubes (22) and is spaced apart from another adjacent one of the folded flat tubes (22), and any one of the folded flat tubes (22) is arranged in close contact with an adjacent one of the horizontal flat tubes (12) and is spaced apart from another adjacent one of the horizontal flat tubes (12).

2. The multi-media microchannel heat exchanger according to claim 1, characterized in that: The multi-media microchannel heat exchanger further comprises a plurality of fins (30), any two of the flat flow tubes (12) and the folded flat tubes (22) that are bonded together form a heat exchange group, and a fin (30) is bonded to both sides of any one of the heat exchange groups, and the fins (30) are arranged in a wave-like extension and have a plurality of sub-channels (31) spaced apart along the length direction.

3. The multi-media microchannel heat exchanger according to claim 1, characterized in that: The multi-media microchannel heat exchanger further comprises two first headers (11) and two second headers (21), the two first headers (11) being respectively arranged at the two ends of the plurality of horizontal flat tubes (12) and being connected via the plurality of horizontal flat tubes (12), and the two second headers (21) being respectively arranged at the two ends of the plurality of folded flat tubes (22) and being connected via the plurality of folded flat tubes (22).

4. The multi-media microchannel heat exchanger according to claim 3, characterized in that: The two first collecting pipes (11) each include a first inlet pipe for a first circulating medium to flow in and a first outlet pipe for the first circulating medium to flow out, and the two second collecting pipes (21) each include a second inlet pipe for a second circulating medium to flow in and a second outlet pipe for the second circulating medium to flow out, the first inlet pipe and the second outlet pipe are arranged on the same side, and the first outlet pipe and the second inlet pipe are arranged on the other side, so that the flow directions of the first circulating medium and the second circulating medium are opposite.

5. The multi-media microchannel heat exchanger according to claim 3, characterized in that: Both ends of the plurality of flat flow tubes (12) are provided with a first bending section (121), the first bending section (121) is extended away from the length direction of the flat flow tubes (12), the first bending sections (121) at both ends of the flat flow tubes (12) are bent in the same or opposite directions, two first collecting pipes (11) are respectively connected to the plurality of first bending sections (121) on the same side, and / or, Both ends of the plurality of folded flat tubes (22) have a second bending section (221), the second bending section (221) extending away from the length direction of the folded flat tube (22), and the second bending section (221) at both ends of the folded flat tube (22) The second bending sections (221) have the same or opposite bending directions, and the two second current collecting pipes (21) are respectively connected to a plurality of the second bending sections (221) on the same side; The first current collecting pipe (11) and the second current collecting pipe (21) located on the same side are separated by the first bending section (121) and / or the second bending section (221).

6. The multi-media microchannel heat exchanger according to claim 3, characterized in that: One end of each of the plurality of flat flow tubes (12) comprises a first bending section (121), the first bending section (121) extending away from the length direction of the flat flow tubes (12); the other end of each of the plurality of folded flat tubes (22) comprises a second bending section (221), the second bending section (221) extending away from the length direction of the folded flat tubes (22); two first current collecting tubes (11) are respectively connected to the other ends of the plurality of first bending sections (121) and the plurality of flat flow tubes (12); two second current collecting tubes (21) are respectively connected to the other ends of the plurality of second bending sections (221) and the plurality of folded flat tubes (22); the first current collecting tube (11) and the second current collecting tube (21) on the same side are spaced apart by the first bending section (121) or the second bending section (221).

7. The multi-media microchannel heat exchanger according to any one of claims 5 or 6, characterized in that: The radius of the first current collecting pipe (11) is R1, the radius of the second current collecting pipe (21) is R2, the width of the first bending section (121) or the second bending section (221) is T, and the bending angle of the first bending section (121) and / or the second bending section (221) is θ; or 8. The multi-media microchannel heat exchanger according to claim 3, characterized in that: The folded flat tube (22) comprises a winding section (223) and a tube wall section (224) which are connected to each other, the tube wall section (224) is arranged to surround the cavity, the tube wall section (224) is arranged around the winding section (223), the winding section (223) extends along the length direction of the folded flat tube (22), and has a plurality of recesses along the width direction of the folded flat tube (22), and the plurality of recesses and the inner wall of the tube wall section (224) surround to form a plurality of the first sub-flow paths (222).

9. The multi-media microchannel heat exchanger according to any one of claims 1 to 8, characterized in that: A plurality of the first sub-flow paths (222) are arranged at intervals along the width direction of the folded flat tube (22), a plurality of the second sub-flow paths are arranged at intervals along the width direction of the flat flow flat tube (12), and the center lines of the plurality of the first sub-flow paths (222) and the center lines of the plurality of the second sub-flow paths are alternately distributed in the width direction of the flat flow flat tube (12) and / or the folded flat tube (22).

10. The multi-media microchannel heat exchanger according to claim 8, characterized in that: At least one end of the folded flat tube (22) has a second bending section (221), the second bending section (221) extending away from the length direction of the folded flat tube (22), the second bending section (221) having a bending start end away from the second collecting pipe (21), and the winding section (223) extending along the length direction of the folded flat tube (22) to the bending start end.

11. The multi-media microchannel heat exchanger according to claim 9, characterized in that: The width of the flat flow tube (12) is equal to the width of the folded flat tube (22), N first sub-flow paths (222) are provided, M second sub-flow paths are provided, and N <M<2N-1。 12. The multi-media microchannel heat exchanger according to claim 1, characterized in that: The plate material of the folded flat tube (22) is formed by stacking multiple layers of double-sided composite aluminum foil.

13. The multi-media microchannel heat exchanger according to claim 2, characterized in that: The horizontal flow flat tube group (10), the folded flat tube group (20) and the plurality of fins (30) are connected by brazing.

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