Microchannel parallel flow heat exchanger

Abstract

The present disclosure provides a microchannel parallel flow heat exchanger, belonging to the field of heat exchange technology. The microchannel parallel flow heat exchanger includes a flat tube assembly, a manifold assembly, and a fin assembly. The manifold assembly includes a first manifold and a second manifold. The flat tube assembly includes a plurality of flat tube units, each of which is arranged in sequence along the length of the first manifold. Each flat tube unit includes a first flat tube portion and a second flat tube portion. The first and second flat tube portions are both elongated structures and are arranged in a direction perpendicular to the first manifold. The bent ends of the first and second flat tube portions are connected together, and the straight ends of the first and second flat tube portions are connected to the first and second manifolds, respectively. The fin assembly includes a plurality of fin units, with a fin unit sandwiched between each two adjacent first flat tube portions and each between each two adjacent second flat tube portions. The present disclosure can reduce material costs.

Description

Technical Field

[0001] The present disclosure belongs to the field of heat exchange technology, and in particular relates to a microchannel parallel flow heat exchanger. Background Art

[0002] A heat exchanger is a common heat exchange device, which mainly includes a flat tube assembly, a header assembly and a fin assembly. The header assembly includes a first header and a second header. The first header and the second header are connected through the flat tube assembly. The fin assembly is arranged in the flat tube assembly to exchange heat with the coolant flowing in the flat tube assembly.

[0003] To improve heat transfer efficiency, heat exchangers typically employ two sets of header assemblies. Flat tubes connect the first and second headers of each set, ensuring interconnected communication between the two sets. This arrangement allows coolant to flow between the two sets, increasing the time it takes for the coolant to pass through the flat tubes. This increases the time it takes for the fin assembly to transfer heat to the coolant, ultimately improving heat transfer efficiency.

[0004] However, although the above heat exchanger improves the heat exchange effect, the fact that two sets of header assemblies are provided in the heat exchanger leads to an increase in material cost. Summary of the Invention

[0005] The present disclosure provides a microchannel parallel flow heat exchanger that can reduce material costs while ensuring heat exchange performance. The technical solution is as follows:

[0006] The embodiment of the present disclosure provides a microchannel parallel flow heat exchanger, which includes a flat tube assembly, a header assembly, and a fin assembly.

[0007] The header assembly includes a first header and a second header, wherein the first header and the second header are arranged parallel to each other and spaced apart;

[0008] The flat tube assembly includes a plurality of flat tube units, each of which is arranged in sequence along the length direction of the first manifold. Each of the flat tube units includes a first flat tube portion and a second flat tube portion. The first flat tube portion and the second flat tube portion are both long strip structures. The first flat tube portion and the second flat tube portion each include a bent end and a straight end. For any flat tube unit, the first flat tube portion and the second flat tube portion are arranged in a direction perpendicular to the first manifold, and the middle portions of the first flat tube portion and the second flat tube portion are located on the same plane perpendicular to the first manifold. The bent ends of the first flat tube portion and the second flat tube portion are connected together, the straight end of the first flat tube portion is connected to the first manifold, and the straight end of the second flat tube portion is connected to the second manifold.

[0009] The fin assembly includes a plurality of fin units. One fin unit is sandwiched between each two adjacent first flat tube portions, and one fin unit is sandwiched between each two adjacent second flat tube portions.

[0010] In one implementation of the present disclosure, the bent end of the first flat tube portion is bent toward the second flat tube portion, and the bent end of the second flat tube portion is bent toward the first flat tube portion, and the bending angle of the first flat tube portion is the same as the bending angle of the second flat tube portion.

[0011] In another implementation of the present disclosure, the bent end of the first flat tube portion is folded to one side of the first flat tube portion, and the bent end of the first flat tube portion and the middle portion of the first flat tube portion are spaced apart in the length direction of the first collecting pipe.

[0012] In another implementation of the present disclosure, the bent end of the second flat tube portion is folded to one side of the second flat tube portion, and the bent end of the second flat tube portion and the middle portion of the second flat tube portion are spaced apart in the length direction of the second collecting pipe.

[0013] In another implementation of the present disclosure, the distance between the bent end of the first flat tube portion and the middle portion of the first flat tube portion in the length direction of the first collecting pipe is equal to the distance between the bent end of the second flat tube portion and the middle portion of the second flat tube portion in the length direction of the second collecting pipe.

[0014] In another implementation of the present disclosure, the bent end of the first flat tube portion is folded to one side of the first flat tube portion, and the bent end of the first flat tube portion and the middle portion of the first flat tube portion are arranged at intervals in the length direction of the first collecting pipe. The bent end of the second flat tube portion is folded to one side of the second flat tube portion and bent toward the bent end of the first flat tube portion in a plane perpendicular to the second collecting pipe. The bent end of the second flat tube portion and the middle portion of the second flat tube portion are arranged at intervals in the length direction of the second collecting pipe.

[0015] In another implementation of the present disclosure, the distance between the bent end of the first flat tube portion and the middle portion of the first flat tube portion in the length direction of the first collecting pipe is equal to the distance between the bent end of the second flat tube portion and the middle portion of the second flat tube portion in the length direction of the second collecting pipe.

[0016] In yet another implementation of the present disclosure, the first flat tube portion and the second flat tube portion are an integral structural component.

[0017] In yet another implementation of the present disclosure, an angle between a middle portion of the first flat tube portion and a middle portion of the second flat tube portion is no greater than 90°.

[0018] In yet another implementation of the present disclosure, the fin unit located between two adjacent first flat tube portions and the fin unit located between two adjacent second flat tube portions are spaced apart from each other.

[0019] The technical solutions provided by the embodiments of the present disclosure have the following beneficial effects:

[0020] When heat exchange is performed through the microchannel parallel flow heat exchanger provided by the embodiment of the present disclosure, the coolant flows in from the first manifold and flows out through the straight-connected end of the first flat tube section. During the circulation process in the first flat tube section, heat exchange is performed using the fin unit clamped between the first flat tube section and the second flat tube section, thus achieving the first heat exchange of a flat tube unit. The coolant flows from the bent end of the first flat tube section to the bent end of the second flat tube section. During the connection process of the second flat tube section, heat exchange is performed using the fin unit clamped between two adjacent first flat tube sections and the fin unit clamped between two second flat tube sections, thus achieving the second heat exchange of the same flat tube unit. After that, the coolant flows from the straight-connected end of the second flat tube section to the second manifold, completing the entire heat exchange process. In other words, heat exchange can be performed twice in a single flat tube unit provided by the present disclosure, thereby ensuring the heat exchange capacity. Furthermore, since the first flat tube portion and the second flat tube portion are spaced apart in a direction perpendicular to the first header, the microchannel parallel flow heat exchanger provided by the present disclosure is actually a double-row microchannel parallel flow heat exchanger, further improving the heat exchange effect.

[0021] In addition, since the microchannel parallel flow heat exchanger provided by the present disclosure realizes the reflux of the coolant by utilizing the bending of the flat tube unit itself, only two headers (a first header and a second header) are required, thereby reducing material costs.

[0022] It can be seen that the microchannel parallel flow heat exchanger provided in the embodiment of the present disclosure can reduce material costs while ensuring the heat exchange effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 1 is a schematic structural diagram of a microchannel parallel flow heat exchanger provided in an embodiment of the present disclosure;

[0025] Figure 2 1 is a schematic structural diagram of a flat tube unit provided by an embodiment of the present disclosure;

[0026] Figure 3 is a front view of a flat tube unit provided by an embodiment of the present disclosure;

[0027] Figure 4 is a bottom view of a flat tube unit provided by an embodiment of the present disclosure;

[0028] Figure 5 This is a right side view of a flat tube unit provided by an embodiment of the present disclosure;

[0029] Figure 6 1 is a schematic structural diagram of another microchannel parallel flow heat exchanger provided by an embodiment of the present disclosure;

[0030] Figure 7 is a front view of another flat tube unit provided by an embodiment of the present disclosure;

[0031] Figure 8 is a bottom view of another flat tube unit provided by an embodiment of the present disclosure;

[0032] Figure 9 It is a right view of another flat tube unit provided in an embodiment of the present disclosure.

[0033] The symbols in the figure mean the following:

[0034] 1. Flat tube assembly; 11. Flat tube unit; 111. First flat tube portion; 112. Second flat tube portion; 2. Manifold assembly; 21. First manifold; 22. Second manifold; 3. Fin assembly; 31. Fin unit. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0036] The embodiment of the present disclosure provides a microchannel parallel flow heat exchanger, which is actually a double-row microchannel parallel flow heat exchanger, such as Figure 1 As shown, the microchannel parallel flow heat exchanger includes a flat tube assembly 1, a header assembly 2 and a fin assembly 3.

[0037] The header assembly 2 includes a first header 21 and a second header 22 . The first header 21 and the second header 22 are arranged parallel to each other and spaced apart.

[0038] The flat tube assembly 1 includes a plurality of flat tube units 11, each of which is arranged in sequence along the length direction of the first manifold 21. Each flat tube unit 11 includes a first flat tube portion 111 and a second flat tube portion 112. The first flat tube portion 111 and the second flat tube portion 112 are both long strip structures. The first flat tube portion 111 and the second flat tube portion 112 both include a bent end and a straight end. For any flat tube unit 11, the first flat tube portion 111 and the second flat tube portion 112 are arranged in a direction perpendicular to the first manifold 21, and the middle portions of the first flat tube portion 111 and the second flat tube portion 112 are both located on the same plane perpendicular to the first manifold 21. The bent ends of the first flat tube portion 111 and the second flat tube portion 112 are connected together, the straight end of the first flat tube portion 111 is connected to the first manifold 21, and the straight end of the second flat tube portion 112 is connected to the second manifold 22.

[0039] The fin assembly 3 includes a plurality of fin units 31 . A fin unit 31 is sandwiched between each two adjacent first flat tube portions 111 , and a fin unit 31 is sandwiched between each two adjacent second flat tube portions 112 .

[0040] It should be noted that in order to more clearly show the structure of the flat tube unit 11, Figure 1 Some fin units 31 are omitted. In practice, the fin unit 31 located between two adjacent first flat tube sections 111 can extend from the bent end of the first flat tube section 111 to the straight end of the first flat tube section 111. Similarly, the fin unit 31 located between two adjacent second flat tube sections 112 can extend from the bent end of the second flat tube section 112 to the straight end of the first flat tube section 111.

[0041] During heat exchange in the microchannel parallel flow heat exchanger provided by the embodiments of the present disclosure, coolant flows into the first manifold 21 and out through the straight-connected end of the first flat tube section 111. During the flow within the first flat tube section 111, heat exchange occurs using the fin unit 31 sandwiched between the first and second flat tube sections 111, 112. This achieves the first heat exchange within a flat tube section 11. The coolant flows from the bent end of the first flat tube section 111 to the bent end of the second flat tube section 112. During the flow within the second flat tube section 112, heat exchange occurs using the fin unit 31 sandwiched between two adjacent first flat tube sections 111 and between two second flat tube sections 112. This achieves the second heat exchange within the same flat tube section 11. Afterward, the coolant flows from the straight-connected end of the second flat tube section 112 to the second manifold 22, completing the entire heat exchange process. In other words, a single flat tube section 11 provided by the present disclosure can undergo two heat exchanges, ensuring optimal heat exchange capacity. Furthermore, since the first flat tube portion 111 and the second flat tube portion 112 are spaced apart in a direction perpendicular to the first manifold 21 , the microchannel parallel flow heat exchanger provided by the present disclosure is actually a double-row microchannel parallel flow heat exchanger, further improving the heat exchange effect.

[0042] In addition, since the microchannel parallel flow heat exchanger provided by the present disclosure utilizes the bending of the flat tube unit 11 to achieve the reflux of the coolant, only two headers (the first header 21 and the second header 22) need to be set, thereby reducing material costs.

[0043] It can be seen that the microchannel parallel flow heat exchanger provided in the embodiment of the present disclosure can reduce material costs while ensuring the heat exchange effect.

[0044] In this embodiment, the fin unit 31 located between two adjacent first flat tube portions 111 and the fin unit 31 located between two adjacent second flat tube portions 112 are spaced apart from each other.

[0045] In the above implementation, the fin assembly 3 is essentially divided into two independent parts: one part specifically performs heat exchange in the first flat tube portion 111, while the other part specifically performs heat exchange in the second flat tube portion 112. This allows for uniform heat dissipation of the coolant in the first and second flat tube portions 111, 112, without causing uneven heat dissipation.

[0046] In addition, since the two parts of the fin units 31 are arranged at intervals from each other, the manufacturing materials of the fin units 31 are saved, thereby reducing the manufacturing cost of the microchannel parallel flow heat exchanger.

[0047] In this embodiment, the first flat tube portion 111 and the second flat tube portion 112 are an integrated structural component.

[0048] In the above implementation, such an arrangement can ensure the structural integrity of the flat tube unit 11, which not only improves the structural strength of the flat tube unit 11, but also facilitates the production of the flat tube unit 11, thereby reducing manufacturing costs and efficiency.

[0049] For example, the first flat tube portion 111 and the second flat tube portion 112 may both be aluminum structural members to reduce the weight of the flat tube structure and ensure heat exchange effect.

[0050] Figure 2 This is a structural diagram of a flat tube unit provided in this embodiment, combined with Figure 2 In this embodiment, the bent end of the first flat tube portion 111 is bent toward the second flat tube portion 112 , and the bent end of the second flat tube portion 112 is bent toward the first flat tube portion 111 . The bending angle α1 of the first flat tube portion 111 and the bending angle α2 of the second flat tube portion 112 are the same.

[0051] In the above implementation, the bent end of the first flat tube portion 111 and the bent end of the second flat tube portion 112 are bent toward each other at the same bending angle. This can avoid excessive bending of either the bent end of the first flat tube portion 111 or the bent end of the second flat tube portion 112, thereby ensuring the structural strength of the flat tube unit 11.

[0052] In addition, since excessive bending of the bent end of the first flat tube portion 111 or the bent end of the second flat tube portion 112 is avoided, the passability of the coolant in the bent end of the first flat tube portion 111 and the bent end of the second flat tube portion 112 can be guaranteed, so that the coolant can flow smoothly from the first flat tube portion 111 to the second flat tube portion 112, and the flow rate of the coolant can be guaranteed.

[0053] Figure 3 A front view of a flat tube unit provided in this embodiment, combined with Figure 3 For example, the bending angle α1 of the first flat tube portion 111 and the bending angle α2 of the second flat tube portion 112 may both be 90°.

[0054] In the above implementation, if the bending angle is greater than 90°, the first and second flat tube portions 111, 112 will be bent too much, potentially affecting the circulation of the coolant. If the bending angle is less than 90°, the first and second flat tube portions 111, 112 will not be bent enough, resulting in excessive protrusion, which may affect the installation of the microchannel parallel flow heat exchanger. However, setting the bending angle to 90° as described above ensures the circulation of the coolant without affecting the installation of the microchannel parallel flow heat exchanger.

[0055] It should be noted that, if other practical needs are to be met, the above-mentioned bending angle can also be adjusted according to the actual needs, and the present disclosure does not limit this.

[0056] Optionally, the angle between the middle portion of the first flat tube portion 111 and the middle portion of the second flat tube portion 112 is no greater than 90°.

[0057] In the above implementation, this angle is limited by the production process and the installation space of the microchannel parallel flow heat exchanger. Setting this angle to no greater than 90° allows for the manufacture of the flat tube unit 11 at a relatively low manufacturing cost. Furthermore, the compactness of the microchannel parallel flow heat exchanger is ensured, and the installation space required for the microchannel parallel flow heat exchanger is not excessively large.

[0058] Illustratively, the middle of the first flat tube portion 111 and the middle of the second flat tube portion 112 are parallel to each other, the middle of the first flat tube portion 111 is perpendicular to the first header 21 , and the middle of the second flat tube portion 112 is perpendicular to the second header 22 .

[0059] See again Figure 2 In this embodiment, the bent end of the first flat tube portion 111 is folded to one side of the first flat tube portion 111 , and the bent end of the first flat tube portion 111 and the middle portion of the first flat tube portion 111 are spaced apart in the length direction of the first collecting pipe 21 .

[0060] It should be noted that the fold line L1 between the bent end of the first flat tube portion 111 and the middle portion of the first flat tube portion 111 is inclined from the outer side of the first flat tube portion 111 toward the inner side and away from the first manifold 21 .

[0061] In the above implementation, the bending between the bent end and the middle portion of the first flat tube portion 111 is achieved by folding, which is relatively easy to implement. For example, according to the above method, a straight flat tube (which can be a standard part that is easily available and low-cost) can be provided first. Then, a single folding operation using a tube bender is required to obtain the above structure, making the operation relatively simple.

[0062] Optionally, the bent end of the second flat tube portion 112 is folded to one side of the second flat tube portion 112 , and the bent end of the second flat tube portion 112 and the middle portion of the second flat tube portion 112 are spaced apart in the length direction of the second manifold 22 .

[0063] It should be noted that the fold line L2 between the bent end of the second flat tube portion 112 and the middle portion of the second flat tube portion 112 is inclined from the outer side of the second flat tube portion 112 toward the inner side and away from the second manifold 22 .

[0064] In the above implementation, based on the same reason, the bending between the bent end of the second flat tube portion 112 and the middle portion of the second flat tube portion 112 is achieved by folding, which is relatively easy to implement.

[0065] It should be noted that one side of the first flat tube portion 111 and one side of the second flat tube portion 112 are the same side.

[0066] In this way, the butt connection between the bent end of the first flat tube portion 111 and the bent end of the second flat tube portion 112 can be facilitated.

[0067] Figure 4 A bottom view of a flat tube unit provided in this embodiment, combined with Figure 4 For example, the distance d1 between the bent end of the first flat tube portion 111 and the middle of the first flat tube portion 111 in the length direction of the first collecting pipe 21 is equal to the distance d2 between the bent end of the second flat tube portion 112 and the middle of the second flat tube portion 112 in the length direction of the second collecting pipe 22.

[0068] In the above implementation, through the above definition, it can be ensured that the bending degrees of the bent end of the first flat tube portion 111 and the bent end of the second flat tube portion 112 are substantially the same.

[0069] Figure 5 This is a right view of a flat tube unit provided in this embodiment, combined with Figure 5 For example, the spacings d1 and d2 can be adjusted based on the actual height H of the fin unit 31 selected for the product, and can fall within the range of 0 < (d1 = d2) ≤ H. This configuration prevents interference and collision between adjacent flat tube units 11 caused by excessive spacings d1 and d2. For example, when d1 = d2 = H, which is the maximum value of spacings d1 and d2, the bent end of the first flat tube portion 111, the bent end of the second flat tube portion 112, and the fin unit 31 all contact an adjacent flat tube unit 11, preventing interference and collision.

[0070] Figure 6 A schematic diagram of another microchannel parallel flow heat exchanger provided for the present disclosure, combined with Figure 6 The structure of the microchannel parallel flow heat exchanger is similar to Figure 1 The microchannel parallel flow heat exchangers shown are basically the same, the only difference being the bending manner of the flat tube units 11 .

[0071] In this embodiment, the bent end of the first flat tube portion 111 is folded to one side of the first flat tube portion 111, and the bent end of the first flat tube portion 111 and the middle portion of the first flat tube portion 111 are spaced apart in the length direction of the first manifold 21. The bent end of the second flat tube portion 112 is folded to one side of the second flat tube portion 112 and bent toward the bent end of the first flat tube portion 111 in a plane perpendicular to the second manifold 22. The bent end of the second flat tube portion 112 and the middle portion of the second flat tube portion 112 are spaced apart in the length direction of the second manifold 22.

[0072] It should be noted that one side of the first flat tube portion 111 and one side of the second flat tube portion 112 are the same side.

[0073] In this way, the butt connection between the bent end of the first flat tube portion 111 and the bent end of the second flat tube portion 112 can be facilitated.

[0074] In the above implementation, the fold line L3 between the bent end of the first flat tube portion 111 and the middle portion of the first flat tube portion 111 is inclined away from the first manifold 21 along the outer edge toward the inner edge of the first flat tube portion 111. The fold line L4 between the bent end of the second flat tube portion 112 and the middle portion of the second flat tube portion 112 is arranged perpendicular to the second manifold 22 along the outer edge toward the inner edge of the second flat tube portion 112.

[0075] Figure 7 This is a front view of another flat tube unit provided in this embodiment, combined with Figure 7 For example, the angle between the middle portion of the first flat tube portion 111 and the middle portion of the second flat tube portion 112 is no greater than 90°.

[0076] In the above implementation, this angle is limited by the production process and the installation space of the microchannel parallel flow heat exchanger. Setting this angle to no greater than 90° allows for the manufacture of the flat tube unit 11 at a relatively low manufacturing cost. Furthermore, the compactness of the microchannel parallel flow heat exchanger is ensured, and the installation space required for the microchannel parallel flow heat exchanger is not excessively large.

[0077] Illustratively, the middle of the first flat tube portion 111 and the middle of the second flat tube portion 112 are parallel to each other, the middle of the first flat tube portion 111 is perpendicular to the first header 21 , and the middle of the second flat tube portion 112 is perpendicular to the second header 22 .

[0078] Figure 8 A bottom view of another flat tube unit provided in this embodiment, combined with Figure 8For example, the distance d3 between the bent end of the first flat tube portion 111 and the middle portion of the first flat tube portion 111 in the length direction of the first collecting pipe 21 is equal to the distance d4 between the bent end of the second flat tube portion 112 and the middle portion of the second flat tube portion 112 in the length direction of the second collecting pipe 22.

[0079] In the above implementation, through the above definition, it can be ensured that the bending degrees of the bent end of the first flat tube and the bent end of the second flat tube portion 112 are substantially the same.

[0080] Figure 9 This is a right view of another flat tube unit provided in this embodiment, combined with Figure 9 For example, the spacings d3 and d4 can be adjusted based on the actual height H of the fin unit 31 selected for the product, and can fall within the range of 0 < (d3 = d4) ≤ H. This configuration prevents interference and collision between adjacent flat tube units 11 caused by excessive spacings d3 and d4. For example, when d3 = d4 = H, which is the maximum value of spacings d3 and d4, the bent end of the first flat tube portion 111, the bent end of the second flat tube portion 112, and the fin unit 31 all contact an adjacent flat tube unit 11, preventing interference and collision.

[0081] The above description is merely an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the scope of protection of the present disclosure.

Claims

1. A microchannel parallel flow heat exchanger, comprising a flat tube assembly (1), a header assembly (2) and a fin assembly (3), characterized in that: The manifold assembly (2) comprises a first manifold (21) and a second manifold (22), wherein the first manifold (21) and the second manifold (22) are arranged parallel to each other and spaced apart. The flat tube assembly (1) comprises a plurality of flat tube units (11), each of the flat tube units (11) being arranged in sequence and spaced apart along the length direction of the first header (21), each of the flat tube units (11) comprising a first flat tube portion (111) and a second flat tube portion (112), the first flat tube portion (111) and the second flat tube portion (112) both being long strip structures, the first flat tube portion (111) and the second flat tube portion (112) both comprising a bent end and a straight end, and for any flat tube unit (11), the first flat tube portion (111) and the second flat tube portion (112) being arranged in sequence and spaced apart in a direction perpendicular to the first header (21), The middle parts of the first flat tube portion (111) and the second flat tube portion (112) are both located on the same plane perpendicular to the first collecting pipe (21); the distance from the bent end of the first flat tube portion (111) to the straight end is greater than the distance from the bent end of the second flat tube portion (112) to the straight end; the bent end of the first flat tube portion (111) is folded to one side of the first flat tube portion (111); the bent end of the first flat tube portion (111) and the middle part of the first flat tube portion (111) are arranged at intervals in the length direction of the first collecting pipe (21); the bent end of the second flat tube portion (112) is folded to one side of the second flat tube portion (112); and The second flat tube portion (112) is bent toward the bent end of the first flat tube portion (111) on a plane perpendicular to the second collecting tube (22); the bent end of the second flat tube portion (112) and the middle portion of the second flat tube portion (112) are spaced apart in the length direction of the second collecting tube (22); the fold line between the bent end of the first flat tube portion (111) and the middle portion of the first flat tube portion (111) is inclined along the outer edge of the first flat tube portion (111) toward the inner edge and away from the first collecting tube (21); the fold line between the bent end of the second flat tube portion (112) and the middle portion of the second flat tube portion (112) is inclined along the outer edge of the second flat tube portion (112) toward the inner edge and away from the first collecting tube (21); The first flat tube portion (111) is arranged perpendicular to the second current collecting pipe (22) in the direction of the inner side, the distance between the bent end of the first flat tube portion (111) and the middle part of the first flat tube portion (111) in the length direction of the first current collecting pipe (21) is equal to the distance between the bent end of the second flat tube portion (112) and the middle part of the second flat tube portion (112) in the length direction of the second current collecting pipe (22), the bent ends of the first flat tube portion (111) and the second flat tube portion (112) are connected together, the straight end of the first flat tube portion (111) is connected to the first current collecting pipe (21), and the straight end of the second flat tube portion (112) is connected to the second current collecting pipe (22); The fin assembly (3) comprises a plurality of fin units (31), wherein one fin unit (31) is sandwiched between each two adjacent first flat tube portions (111), and one fin unit (31) is sandwiched between each two adjacent second flat tube portions (112).

2. The microchannel parallel flow heat exchanger according to claim 1, characterized in that: The first flat tube portion (111) and the second flat tube portion (112) are integral structural components.

3. The microchannel parallel flow heat exchanger according to claim 1, characterized in that: An included angle between a middle portion of the first flat tube portion (111) and a middle portion of the second flat tube portion (112) is no greater than 90°.

4. The microchannel parallel flow heat exchanger according to claim 1, characterized in that: The fin unit (31) located between two adjacent first flat tube portions (111) and the fin unit (31) located between two adjacent second flat tube portions (112) are arranged at intervals from each other.

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