Flat tube adapter, parallel flow heat exchanger and refrigeration equipment

Abstract

The invention provides a flat tube adapter, a parallel flow heat exchanger and refrigeration equipment. The flat tube adapter comprises a polyhedral adapter body. Flat holes, transfer holes corresponding to the flat holes one by one and transfer runners only communicating with the flat holes and the corresponding transfer holes are formed in the transfer body, and the flat holes, the transfer holes and the transfer runners are consistent in number and are in one-to-one correspondence; and each flat hole and the corresponding adapter hole are distributed on two surfaces of the adapter body, and the cross section of the adapter hole is basically close to a circle. Each switching flow channel comprises a flow channel inlet section and a flow channel distribution section. The flow channel inlet section is coaxially communicated with the transfer hole, and the width of the flow channel inlet section is larger than that of the flat hole and smaller than or equal to the aperture of the transfer hole. The runner distribution section is communicated with the runner inlet section and the flat hole, the length direction of the runner distribution section is basically perpendicular to the axial direction of the flat hole, and the length of the runner distribution section is larger than the hole diameter of the transfer hole.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration technology, and particularly to a flat tube adapter, a parallel flow heat exchanger, and a refrigeration device. Background Art

[0002] The parallel flow heat exchanger, also known as a microchannel heat exchanger, is widely used in automotive air conditioner condensers and household single-cool air conditioner condensers due to its advantages such as compact structure, light weight, high heat transfer efficiency, low refrigerant charge, and low manufacturing and recycling costs. As Figure 1 shown, in a traditional parallel flow heat exchanger, both ends of the flat tube 200 are respectively connected to the first header 400a and the second header 400b. The refrigerant is input through the first guide pipe 801 into the distribution chamber 400a1 of the first header 400a and distributed into the first group of flat tubes 200. After that, the refrigerant is collected by the second header 400b and then redistributed into the second group of flat tubes 200'. Finally, the refrigerant is again collected in the collection chamber 400a2 of the first header 400a and output through the second guide pipe 802. Figure 1 The structures of the first group of flat tubes 200 and the second group of flat tubes 200' in Figure 2 are the same, and their schematic diagram is as Figure 1 shown. When the parallel flow heat exchanger in

[0003] is used as an evaporator, the input refrigerant is in a gas-liquid two-phase state. Due to the different thermodynamic properties and resultant forces of the gas-liquid two-phase, the refrigerant is prone to phase separation during the distribution process. The refrigerant distributed into the lower-middle flat tubes of the first header has a significantly higher liquid content, while the refrigerant distributed into the upper several flat tubes has a higher gas content. This uneven distribution will cause a sharp decline in the performance of the heat exchanger.

[0004] In this type of solution, in order to achieve the transition connection between the circular interface and the flat interface, the body of this type of adapter pipe or adapter component is a special-shaped curved surface structure, which will not only lead to complex processing procedures and high processing costs; and because the cavity structure of the casting mold is closely related to the dimensions of the flat pipe or round pipe, a separate mold is required for each specification of the adapter pipe or adapter component, and the mold investment cost is very high, resulting in difficulty in realizing series expansion of the adapter structure to match different parallel flow heat exchangers. Further, in a traditional parallel flow heat exchanger, the header not only distributes the refrigerant into multiple flat pipes but also plays a role in fixing multiple flat pipes and side plates. However, in Japanese Patent JP2013142454A, Chinese Patent CN217383880U, and Chinese Patent CN116753766A, since multiple independent special-shaped adapter pipes (or adapter components) are used to replace the integral header in the traditional parallel flow heat exchanger, the ends of multiple flat pipes and the side plates can no longer be fixed, and there are problems such as low connection strength, component displacement, and even dropping or falling apart of multiple flat pipes and multiple fins. In addition, the circular interface and the flat interface are basically coaxial; however, since there are multiple microchannel holes in the flat pipe, this structure will cause some microchannel holes to penetrate relatively through the circular interface and have the shortest flow path length. After the refrigerant is input from the circular interface, due to the difference in flow path length, it directly enters the microchannel holes opposite to it, resulting in uneven distribution of the refrigerant between different microchannel holes in the same flat hole. Summary of the Invention

[0005] The present invention aims to overcome the deficiencies of the prior art and provides a flat pipe adapter, a parallel flow heat exchanger, and a refrigeration device.

[0006] To achieve the above object, in the first aspect of the present invention, a flat pipe adapter is provided, which includes a polyhedral adapter body. A flat hole, an adapter hole corresponding to each flat hole one by one, and an adapter flow path that only connects each flat hole and the corresponding adapter hole are formed on the adapter body. The numbers of the flat hole, the adapter hole, and the adapter flow path are the same and correspond one by one; each flat hole and the corresponding adapter hole are distributed on two surfaces of the adapter body, and the cross-section of the adapter hole is basically close to a circle. Each adapter flow path includes a flow path inlet section and a flow path distribution section. The flow path inlet section is coaxially connected to the adapter hole, and its width is greater than the width of the flat hole and less than or equal to the aperture of the adapter hole. The flow path distribution section connects the flow path inlet section and the flat hole, and its length direction is basically perpendicular to the axial direction of the flat hole. The length of the flow path distribution section is greater than the aperture of the adapter hole.

[0007] According to an embodiment of the first aspect of the present invention, the second surface where the adapter hole is located is perpendicular to or intersects the first surface where the flat hole is located. The flow path inlet section is basically coaxially connected to the flow path distribution section and the adapter hole. A reflection part is formed at the end of the flow path distribution section to reflect the refrigerant to the flow path distribution section and then distribute it into the flat pipe connected to the flat hole.

[0008] According to an embodiment of the first aspect of the present invention, the second surface where the transfer hole is located is substantially parallel to the first surface where the flat hole is located, and the axial direction of the flow channel inlet section is substantially perpendicular to the length direction of the flow channel distribution section;

[0009] The cross-section of the flow channel distribution section is close to circular, and one end of it extends to a third surface perpendicular to or intersecting the first surface where the flat hole is located and is blocked; alternatively, the flow channel distribution section is a flat flow channel, and its length and width are both substantially close to the flat hole and are substantially coaxial with the flat hole.

[0010] According to an embodiment of the first aspect of the present invention, on the axial projection plane of the flat hole, the projection area of the transfer hole is located on one side in the length direction of the flat hole and the two are spaced apart, and a reflection area is formed on the inner wall of the flow channel distribution section opposite to the flow channel inlet section to reflect the input refrigerant so that it enters the flow channel distribution section.

[0011] According to an embodiment of the first aspect of the present invention, the transfer hole and the flat hole are distributed relatively, and the flat tube adapter further includes a shielding member disposed in the transfer flow channel and opposite to the flow channel inlet section. The shielding member partially shields the cross-section of the transfer flow channel where it is located, and when projected along the axial direction of the flat tube, the shielding member covers a part of the micro-channel holes in the flat tube.

[0012] According to an embodiment of the first aspect of the present invention, in the length direction, at least one end of the flow channel distribution section is substantially flush with or extends beyond the edge of the flat hole in the length direction.

[0013] According to an embodiment of the first aspect of the present invention, the flat tube adapter has a flat hole and a transfer hole, and the flat hole and the transfer hole are connected through a transfer flow channel;

[0014] Alternatively, the flat tube adapter includes a plurality of flat holes and a plurality of transfer holes corresponding to them one by one. The plurality of flat holes are arranged in one row or multiple rows, and each flat hole and the corresponding transfer hole are connected through a transfer flow channel, and the transfer flow channels are not connected to each other.

[0015] In a second aspect, the present invention further provides a parallel flow heat exchanger, which includes a flat tube adapter assembly, one row or multiple rows of flat tubes, and fins. The flat tube adapter assembly includes the above-mentioned flat tube adapter. One row or multiple rows of flat tubes are inserted into and welded to a plurality of transfer holes in the flat tube adapter assembly. The fins are disposed between adjacent flat tubes.

[0016] According to an embodiment of the second aspect of the present invention, the flat tube adapter assembly includes a plurality of flat tube adapters and a connecting member. The connecting member sequentially connects the plurality of flat tube adapters in the arrangement direction of the flat tubes, and the connecting member is a connecting plate or a connecting rod.

[0017] According to an embodiment of the second aspect of the present invention, in the flat tube adapter assembly, an assembly adjustment gap is formed between at least two adjacent flat tube adapters. The structures of the plurality of flat tube adapters are the same, or at least one flat tube adapter is different from other flat tube adapters.

[0018] According to an embodiment of the second aspect of the present invention, the flat tube adapter assembly includes a flat tube adapter. The flat tube adapter includes a plurality of flat holes and a plurality of corresponding adapter holes one by one. The plurality of flat holes correspond to a plurality of flat tubes and are distributed in one row or multiple rows, and a transfer flow channel is provided between each flat hole and the corresponding adapter hole, and the transfer flow channels are not connected to each other.

[0019] According to an embodiment of the second aspect of the present invention, the parallel flow heat exchanger further includes side plates arranged in parallel on the outer periphery of each row of flat tubes, and the side plates are fixedly connected to the flat tube adapter assembly.

[0020] According to an embodiment of the second aspect of the present invention, the flat tube adapter assembly, the plurality of flat tubes and the plurality of fins are integrally welded by furnace brazing.

[0021] According to an embodiment of the second aspect of the present invention, the flat tube adapter assembly is used to connect a plurality of branch pipes on the refrigerant distributor. The parallel flow heat exchanger further includes a header pipe. The header pipe and the flat tube adapter assembly are distributed at the other end of the flat tube. The flat tube is a straight tube or a U-shaped tube with an even number of bending parts;

[0022] Alternatively, the header pipe and the flat tube adapter assembly are distributed at the same end of the flat tube, and the flat tube is a U-shaped tube with an odd number of bending parts.

[0023] According to an embodiment of the second aspect of the present invention, the flat tube adapter assembly further includes a plurality of adapter pipes welded to the plurality of adapter holes. The adapter pipes are configured to connect a plurality of branch pipes of the refrigerant distributor or the refrigerant collector.

[0024] According to an embodiment of the second aspect of the present invention, at least one end of the plurality of adapter pipes extends beyond the ends of the other adapter pipes;

[0025] Alternatively, at least one adapter pipe is bent and extended towards one side of the arrangement direction of the plurality of adapter pipes;

[0026] Alternatively, the position of at least one adapter hole in the flat tube adapter assembly is offset relative to the other adapter holes, so that the plurality of adapter holes are arranged in a staggered manner along the flat tube arrangement direction.

[0027] According to an embodiment of the second aspect of the present invention, the parallel flow heat exchanger further includes a refrigerant distributor. A plurality of branch pipes on the refrigerant distributor are respectively connected to the corresponding adapter pipes on the flat tube adapter assembly by flame brazing;

[0028] And / or, the parallel flow heat exchanger further includes a refrigerant collector. A plurality of branch pipes on the refrigerant collector are respectively connected to the corresponding adapter pipes on the flat tube adapter assembly by flame brazing.

[0029] In a third aspect, the present invention further provides a refrigeration device, which includes the above-mentioned parallel flow heat exchanger.

[0030] In summary, the flat tube adapter provided by the present invention realizes the connection between a circular pipe and a flat tube through the flat holes, circular adapter holes, and adapter flow channels on the polyhedron adapter body. Compared with the traditional adapter pipe structure with an irregular curved surface transition, the present invention only needs to open holes on the adapter body, which not only has a simple structure but also can significantly reduce the processing cost. In the design of the adapter flow channel: the width of the flow channel inlet section is set to be greater than the width of the flat hole, forming a chamber with an enlarged cross-section to reduce the flow resistance of the refrigerant; on this basis, the length of the flow channel distribution section is set to be greater than the aperture of the adapter hole, extending the distribution path of the refrigerant in the length direction of the flat tube, so that the refrigerant can be evenly distributed to multiple micro-channel holes in the flat tube. At the same time, the width of the flow channel inlet section is also limited to be less than the aperture of the adapter hole, which can reduce the size of the adapter body in the width direction to make it adapt to the limited installation spacing between adjacent flat tubes.

[0031] Furthermore, by arranging a shielding member in the adapter flow channel or staggering the corresponding adapter holes axially in the flat hole, the refrigerant input from the adapter hole is prevented from directly flowing through to the opposite micro-channel hole to improve the uniform distribution. In addition, the parallel flow heat exchanger provided by the present invention is also provided with a flat tube adapter assembly including an integrated flat tube adapter or multiple flat tube adapters connected together by a connecting member; this setting not only realizes the independent connection of each flat tube and the corresponding circular pipe, but also provides end fixation for each row of flat tubes and the side plates on both sides thereof, thereby greatly improving the connection strength and stability of the components in the parallel flow heat exchanger.

[0032] To make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, the detailed description is as follows. Description of the Drawings

[0033] Figure 1 The figure shows a schematic structural diagram of a traditional parallel flow heat exchanger.

[0034] Figure 2 The figure shows Figure 1 a schematic structural diagram of the flat tube in

[0035] Figure 3 The figure shows a schematic structural diagram of the flat tube adapter provided in the first embodiment of the present invention.

[0036] Figure 4 The figure shows Figure 3 a schematic cross-sectional view of

[0037] Figure 5 The figure shows Figure 4 a projection view of

[0038] Figure 6 The figure shows a schematic cross-sectional view of the flat tube adapter provided in another embodiment of the present invention.

[0039] Figure 7 The figure shows a three-dimensional schematic diagram of a flat tube adapter provided by another embodiment of the present invention.

[0040] Figure 8 The figure shows a structural schematic diagram of a parallel flow heat exchanger (with fins removed) provided by Embodiment 1 of the present invention.

[0041] Figure 9 As shown in Figure 8 The structural schematic diagram after removing the refrigerant distributor.

[0042] Figure 10 As shown in Figure 8 The structural schematic diagram of the flat tube adapter assembly in

[0043] Figure 11 As shown in Figure 10 The front projection schematic diagram of

[0044] Figure 12 The figure shows a structural schematic diagram of a flat tube adapter assembly provided by another embodiment of the present invention.

[0045] Figure 13 The figure shows a structural schematic diagram of a flat tube adapter assembly provided by another embodiment of the present invention.

[0046] Figure 14 The figure shows a three-dimensional schematic diagram of a flat tube adapter assembly in which the transfer pipe bends and extends to one side provided by another embodiment of the present invention.

[0047] Figure 15 The figure shows a side schematic diagram of a flat tube adapter assembly provided by another embodiment of the present invention, in which the center connection line of multiple transfer holes is distributed in a broken line in the flat tube arrangement direction.

[0048] Figure 16 The figure shows that the flat tube adapter provided by another embodiment of the present invention is different from Figure 15 , and the side schematic diagram of a flat tube adapter assembly in which the center connection line of multiple transfer holes is still distributed in a broken line in the flat tube arrangement direction.

[0049] Figure 17 The figure shows a structural schematic diagram of a parallel flow heat exchanger (with fins removed) provided by another embodiment of the present invention.

[0050] Figure 18 As shown in Figure 17 The structural schematic diagram of the transfer elbow in

[0051] Figure 19 The figure shows a structural schematic diagram of a parallel flow heat exchanger (with fins and top side plates removed) provided by another embodiment of the present invention.

[0052] Figure 20The following is a schematic structural diagram of the flat tube adapter provided in the second embodiment of the present invention.

[0053] Figure 21 Shown as Figure 20 The schematic structural diagram from another perspective.

[0054] Figure 22 Shown as Figure 20 The schematic cross-sectional view of

[0055] Figure 23 Shown as Figure 22 The projection view of

[0056] Figure 24 The following is a schematic structural diagram of the flat tube adapter provided in another embodiment of the present invention.

[0057] Figure 25 The following is a schematic structural diagram of the flat tube adapter provided in the third embodiment of the present invention.

[0058] Figure 26 Shown as Figure 25 The schematic structural diagram from another perspective.

[0059] Figure 27 Shown as Figure 25 The schematic cross-sectional view of

[0060] Figure 28 Shown as Figure 27 The projection view of

[0061] Figure 29 The following is a schematic structural diagram of the flat tube adapter provided in another embodiment of the present invention.

[0062] Figure 30 Shown as Figure 29 The schematic cross-sectional view from another perspective.

[0063] Figure 31 The following is a schematic structural diagram of the flat tube adapter provided in the fourth embodiment of the present invention.

[0064] Figure 32 Shown as Figure 31 The schematic cross-sectional view of Detailed implementation manners

[0065] Embodiment 1

[0066] In the existing flat tube adapter structure of a parallel flow heat exchanger, the adapter pipe or adapter component with a special-shaped curved surface needs to be processed and formed using a specific mold (such as a casting mold), which not only involves cumbersome processing procedures but also results in high processing costs. In addition, after replacing the integral header in the traditional parallel flow heat exchanger with multiple independent special-shaped adapter pipes (or adapter components), the ends of the flat tubes and side plates in the parallel flow heat exchanger will lose support, leading to a series of problems such as low connection strength of components and easy disassembling. Moreover, the existing adapter pipes or adapter components also have the drawback of uneven refrigerant distribution caused by the direct passage of refrigerant through the relatively opposed microchannel holes.

[0067] In view of this, as Figure 3 , Figure 4 and Figure 5 shown, this embodiment provides a flat tube adapter 10, which includes an adapter body 1 in the shape of a polyhedron. Flat holes 110, adapter holes 120 corresponding to the flat holes 110 one by one, and adapter flow channels 130 that only connect each flat hole 110 and the corresponding adapter hole 120 are formed on the adapter body 1. The numbers of the flat holes 110, the adapter holes 120, and the adapter flow channels 130 are the same and correspond to each other one by one; when there are multiple adapter flow channels formed on the adapter body 1, the adapter flow channels are not connected to each other. Each flat hole 110 and the corresponding adapter hole 120 are distributed on two surfaces of the adapter body 1, and the cross-section of the adapter hole 120 is basically close to a circle. Each adapter flow channel 130 includes a flow channel inlet section 131 and a flow channel distribution section 132. The flow channel inlet section 131 is coaxially connected to the adapter hole 120, and its width W1 is greater than the width W0 of the flat hole 110 and less than or equal to the aperture D0 of the adapter hole 120. The flow channel distribution section 132 connects the flow channel inlet section 131 and the flat hole 110, and its length direction is basically perpendicular to the axial direction of the flat hole 110. The length L1 of the flow channel distribution section 132 is greater than the aperture D0 of the adapter hole 120.

[0068] The cross-section of the adapter hole 120 being basically close to a circle means that: theoretically, the cross-section of the designed adapter hole 120 is circular, but due to the influence of geometric tolerances during the actual processing, the cross-section of the adapter hole 120 will deviate from the theoretical design, so the description of being basically close is used.

[0069] The flat tube adapter 10 provided in this embodiment only needs to perform hole-opening operations on the adapter body 1 to conveniently realize the processing of the flat holes 110, the circular adapter holes 120, and the adapter flow channels 130. Compared with the existing adapter pipes or adapter components with special-shaped structures, this setting undoubtedly has a simpler structure and lower processing costs. Further, for flat holes 110 and adapter holes 120 of different sizes, only the front-end tool for hole-opening needs to be changed, greatly reducing the mold costs required for processing flat tube adapters 10 of different specifications and well realizing the serial expansion of products.

[0070] However, since the flat hole 110 is a flat-shaped hole with a very small width-to-length ratio, its width W0 is usually only 1.3 mm or 2 mm, but its length can reach 16 mm to 26 mm, or even longer. The adapter hole 120, due to the need to match with an external circular pipe fitting or adapter pipe, usually has an aperture D0 less than or equal to 8 mm. If a circular pipe fitting connected within the adapter hole 120 is directly connected to the flat pipe assembled within the flat hole 110, a flow-through surface with a width of W0 and a length of only D0 will be formed at the connection between the two. At this time, not only will the refrigerant flow resistance increase sharply, but also due to the short length of the flow-through surface, it will be difficult for the refrigerant to be evenly distributed to multiple micro-channel holes within the flat pipe. For this reason, in this embodiment, a transfer flow channel 130 is provided between the flat hole 110 and the adapter hole 120, and the width W1 of the flow channel inlet section 131 is set to be greater than the width W0 of the flat hole, and the length L1 of the flow channel distribution section 132 is set to be greater than the aperture D0 of the adapter hole 120. This setting constructs a long chamber with a relatively wide cross-section within the adapter body 1 to form the transfer flow channel 130, thereby effectively reducing the flow resistance during refrigerant transfer. At the same time, the setting of the length L1 of the flow channel distribution section 132 also increases the flow range of the refrigerant in the length direction of the flat hole 110, improving the distribution uniformity of the refrigerant among multiple micro-channel holes within the flat pipe.

[0071] For the transfer flow channel 130, the larger its width dimension, the smaller the resistance of the refrigerant flow. However, in a parallel flow heat exchanger, multiple flat pipes are arranged in rows in their width direction and the spacing between adjacent flat pipes is very limited, about 8 mm. Taking the width W0 of the flat pipe as 1.3 mm as an example, the center distance between adjacent flat pipes is only 8 + 0.65 + 0.65 = 9.3 mm at this time. Therefore, when designing the transfer flow channel 130, the limitation of this installation dimension also needs to be considered. For this reason, in this embodiment, the width W1 at the flow channel inlet section 131 is set to be less than or equal to the aperture D0 of the adapter hole 120. This setting makes the maximum dimension of the flat pipe adapter 10 in the width direction determined by the width of the second surface 12 where the adapter hole 120 is located. Since the aperture D0 of the adapter hole 120 is basically the same as the inner diameter of the circular interface of the existing adapter pipe; correspondingly, the width of the second surface 12 where the adapter hole 120 is located can also be set to be basically close to the outer diameter at the circular interface, so that the flat pipe adapter 10 provided in this embodiment can be well assembled to adjacent flat pipes. As Figure 5 shown, in this embodiment, the width W1 at the flow channel inlet section 131 is equal to the aperture D0 of the adapter hole 120. However, the present invention makes no limitation in this regard. In other embodiments, as Figure 6 shown, it is also possible to set the width W1 at the flow channel inlet section 131 to be less than the aperture D0 of the adapter hole 120.

[0072] As described above, the flat tube adapter 10 provided in this embodiment fully takes into account various design aspects such as the assembly space limitation between adjacent flat tubes, the refrigerant transfer resistance, the distribution uniformity, the actual processing of the product, and the serialization expansion.

[0073] In this embodiment, as Figure 3 shown, the adapter body 1 is a cube structure, and a flat hole 110 and a corresponding transfer hole 120 are formed on the adapter body 1. However, the present invention does not make any limitation thereto. In other embodiments, the adapter body may also be a tetrahedron with a frustum-shaped cross-section, or other polyhedrons, such as a triangular prism, a pentahedron, or a hexahedron. The present invention also does not make any limitation on the number of flat holes and transfer holes. In other embodiments, a plurality of flat holes and a plurality of corresponding transfer holes may also be distributed on the adapter body, and the plurality of flat holes are arranged in one row or multiple rows, and each flat hole and the corresponding transfer hole are connected by a transfer flow channel, and the transfer flow channels are not connected to each other.

[0074] As Figure 4 and Figure 5 shown, in the adapter body 1 provided in this embodiment, the second surface 12 where the transfer hole 120 is located is substantially perpendicular to the first surface 11 where the flat hole 110 is located, and the flow channel inlet section 131 is substantially coaxially connected to the flow channel distribution section 132 and the transfer hole 120. An external circular pipe fitting is connected to the transfer hole 120, and the input refrigerant is coaxially sprayed into the flow channel distribution section 132 through the flow channel inlet section 131, and then distributed into a plurality of micro-channel holes of the flat tube. In this structure, the transfer hole 120 and the flat hole 110 are distributed with a 90-degree offset. This setting forces the input refrigerant to be transferred through the flow channel distribution section 132 before being distributed into a plurality of micro-channel holes of the flat tube, thereby greatly improving the uniformity of refrigerant distribution and effectively solving the problem of uneven distribution caused by the input refrigerant directly passing through some micro-channel holes inside the flat tube in the existing transfer pipe or transfer component. In addition, a reflection part 1321 is formed at the end of the flow channel distribution section 132, and the input refrigerant is reflected back into the flow channel distribution section 132 after hitting the reflection part 1321; this process can increase the collision degree of the gas-liquid two-phase refrigerant and promote the full mixing of the two-phase flow to further improve the uniformity of refrigerant distribution.

[0075] In this embodiment, as Figure 5 shown, one end of the flow channel distribution section 132 connected to the flow channel inlet section 131 is substantially close to the edge of the flat hole 110 near the transfer hole 120 (that is, Figure 5 the right end of the flow channel distribution section 132 in Figure 5the left edge of the middle flat hole 110). This design makes the length L1 of the flow channel distribution section 132 basically close to the length L0 of the flat hole 110. However, the present invention does not make any limitation in this regard. In other embodiments, it is also possible to arrange that the position where the reflection part extends beyond the other edge of the flat hole in the length direction, so that the length L1 of the flow channel distribution section is greater than the length L0 of the flat hole. In other embodiments, it is also possible to arrange that only one end of the flow channel distribution section is basically flush with or extends beyond the edge of the flat hole in the corresponding length direction, and the length L1 of the flow channel distribution section is slightly shorter than the length L0 of the flat hole; but at this time, the flow-through area in the flow channel distribution section still has to be larger than the flow-through surface with a width of only W0 and a length of only D0 formed when the adapter pipe and the flat pipe are directly butted.

[0076] As Figure 3 shown, in this embodiment, the cross-sectional shapes of both the flow channel inlet section 131 and the flow channel distribution section 132 are circular. However, the present invention does not make any limitation in this regard. In other embodiments, the cross-sectional shapes of the flow channel inlet section and the flow channel distribution section can also be rectangular (as Figure 7 shown), oval or racetrack-shaped and other shapes; and the shapes of the two can be the same or different. In this embodiment, the cross-section of the flow channel inlet section refers to the section formed perpendicular to the axial direction of the flow channel inlet section; and the cross-section of the flow channel distribution section refers to the section formed perpendicular to the length direction of the flow channel distribution section.

[0077] Correspondingly, this embodiment also provides a parallel flow heat exchanger 600 including the above-mentioned flat pipe adapter 10. As Figure 8 shown, the parallel flow heat exchanger provided in this embodiment includes a flat pipe adapter assembly 100, a row of flat pipes 200, fins ( Figure 8 not shown in the figure) arranged between adjacent flat pipes 200, a header 400, and a refrigerant distributor 500. The flat pipe adapter assembly 100 includes a plurality of flat pipe adapters 10 provided in this embodiment, that is, each flat pipe adapter 10 has only one flat hole 110, one adapter hole 120, and a transfer flow channel 130 connecting the two. The end of each flat pipe 200 is inserted into and welded to the flat hole 110 on the corresponding flat pipe adapter 10, and the circular branch pipe 501 on the refrigerant distributor 500 is welded to the adapter hole 120 through the adapter pipe 30, thereby realizing the transition connection from the flat pipe 200 to the circular branch pipe 501. For the convenience of understanding, Figure 8 only the structure of the parallel flow heat exchanger with five U-shaped flat pipes 200 is shown in the figure. However, the present invention does not make any limitation in this regard. In an actual parallel flow heat exchanger, the number of flat pipes 200 is very large, and can be as high as dozens or even hundreds.

[0078] Although this embodiment is described by taking the structures of multiple flat tube adapters 10 in the flat tube adapter assembly 100 as being the same as an example, the present invention does not make any limitation thereto. In its embodiments, the structures of multiple flat tube adapters may not be completely the same; for example, some flat tube adapters only have one flat hole, one adapter hole, and one adapter flow channel; while on some other flat tube adapters, multiple flat holes, multiple adapter holes corresponding to them one by one, and multiple independent adapter flow channels are formed. Or, it is also possible to set the adapter flow channel structure and the distribution position of the adapter holes of some flat tube adapters to be different from those of other flat tube adapters.

[0079] In this embodiment, as Figure 8 and Figure 10 shown, the flat tube adapter assembly 100 further includes a connecting member 20, and the connecting member 20 sequentially connects multiple flat tube adapters 10 in the arrangement direction of the flat tubes 200. The connecting member 20 connects multiple flat tube adapters 10 into a whole, and provides end fixing for each flat tube 200 through each flat tube adapter 10. Further, the parallel flow heat exchanger further includes side plates 300 arranged in parallel on the outer periphery of each row of flat tubes 200, and the ends of the side plates 300 are also fixedly connected to the connecting member 20. The fixing of the ends of the flat tubes 200 and the ends of the flat tubes 200 enables the parallel flow heat exchanger provided in this embodiment to have the advantages of high connection strength and strong stability.

[0080] As Figure 10 and Figure 11 shown, the connecting member 20 is a connecting rod, and each flat tube adapter 10 is further provided with a connecting hole 140 whose axis is parallel to the width direction of the flat hole. The connecting rod sequentially passes through the connecting holes 140 on each flat tube adapter 10, and sequentially connects multiple flat tube adapters 10 in the arrangement direction of the flat tubes 200. Further, since the positions of multiple flat tubes 200 in the parallel flow heat exchanger are basically fixed, after multiple flat tube adapters 10 are sequentially connected, the accumulation of form and position tolerances will cause some flat holes 110 to be unable to be aligned and assembled with the corresponding flat tubes 200. To solve this problem, an assembly adjustment gap 101 is provided between two adjacent flat tube adapters 10 in this embodiment. During assembly, the accumulation of form and position tolerances is eliminated by adjusting the positions between adjacent flat tube adapters 10, so as to ensure that each flat tube 200 can be assembled into the corresponding flat hole 110. In this embodiment, the flat tube adapter 10 is fixed to the connecting rod (connecting member 20) by brazing. However, the present invention does not make any limitation thereto. In other embodiments, it is also possible to set the flat tube adapter to be connected to the connecting rod by self-fusing spot welding or mechanical fixing means (such as the means of screw locking).

[0081] Although this embodiment is described by taking the connecting member 20 as a connecting rod, the present invention does not make any limitation thereto. In other embodiments, as Figure 12As shown, the connecting member 20 can also be set as a connecting plate. A row of assembly holes are formed on the connecting plate 20, and multiple flat tube adapters 10 are sequentially assembled into the corresponding assembly holes.

[0082] In this embodiment, as Figure 8 , Figure 10 and Figure 11 shown, the flat tube adapter assembly 100 further includes a plurality of connecting tubes 30 with a cross-section close to a circle, which are welded to a plurality of adapter holes 120. The connecting tubes 30 are configured to connect a plurality of branch pipes on an external refrigerant distributor. Specifically, after adjusting the position of each flat tube adapter 10 on the connecting rod (i.e., the connecting member 20) and completing the assembly of the corresponding flat tubes 200 and connecting tubes 30, the flat tube adapter assembly 100, a plurality of flat tubes 200, a plurality of fins, and the side plate 300 are integrally welded by furnace brazing. Specifically, the flat tube adapters 10, the connecting tubes 30, the flat tubes 200, and the fins are all made of aluminum or aluminum alloy; while the connecting member 20 is made of aluminum or aluminum alloy; or it can also be made of carbon steel or carbon steel alloy with higher strength. However, the present invention does not make any limitation in this regard.

[0083] In this embodiment, a plurality of branch pipes 501 on the refrigerant distributor 500 are welded to the connecting tubes 30 by flame brazing. The setting of the connecting tubes 30 extends the distance between the welding position of the branch pipes to the flat holes 110, reduces the influence of the welding heat during the flame brazing of the connecting tubes 30 on the secondary welding and melting at the welding joint of the flat holes 110 and the flat tubes 200, and further effectively avoids the leakage problem caused by secondary welding and melting. Further, as Figure 8 shown, in the parallel flow heat exchanger provided in this embodiment, each flat tube 200 has a plurality of bending portions 201; and the more the bending portions 201 are, the larger the distance between the inlet ends of adjacent flat tubes 200 will be (i.e., the larger the distance between adjacent flat holes 110 will be). This setting can greatly reduce the influence of the welding heat on adjacent connecting tubes 30 when flame brazing the connecting tubes 30. In this embodiment, each connecting tube 30 is set as a straight tube and has the same length. However, the present invention does not make any limitation in this regard.

[0084] In other embodiments, when the flat tubes 200 are straight tubes or only have one bending portion, the distance between the inlet ends of adjacent flat tubes is small; correspondingly, the distance between adjacent flat holes 110 on the adapter body 1 is small, and the distance between adjacent adapter holes 120 is also small, which leads to extremely limited space between adjacent connecting tubes 30. When flame brazing the connecting tubes 30 and external circular pipe fittings, the welding heat is easily radiated to adjacent connecting tubes 30, causing the problem of secondary welding and melting. Therefore, the flat tube adapter assembly 100 provided in this embodiment can also increase the distance between adjacent connecting tubes 30 to facilitate welding by setting the length of the connecting tubes 30, its extending direction, or adjusting the position of each adapter hole 120 on the corresponding adapter body 1.

[0085] As shown Figure 13 in Figure 13 , the plurality of adapter pipes 30 are all straight pipes, but at least the end of one adapter pipe 30 extends beyond the ends of other adapter pipes 30; that is, at least the length of one adapter pipe 30 is different from that of other adapter pipes. This setting can adjust the welding position between adjacent adapter pipes 30 to avoid the problem of secondary welding and melting on adjacent adapter pipes.

[0086] As shown Figure 14 in Figure 14 , it is provided that at least one adapter pipe 30 is bent and extended towards one side of the arrangement direction of the plurality of adapter pipes 30 to increase the welding space between adjacent adapter pipes 30.

[0087] Correspondingly, the problem of secondary welding and melting can also be solved by adjusting the position of the adapter holes 120 on the adapter body 1 so that the corresponding adapter pipes 30 are misaligned. As shown Figure 15 in Figure 15 , within the flat pipe adapter assembly 100, each adapter hole 120 is offset relative to the adjacent adapter hole 120, and the center connection line of the plurality of adapter holes 120 forms a broken line in the flat pipe arrangement direction (such as the dotted line in Figure 15 ), that is, the plurality of adapter holes 120 are misaligned and distributed in the flat pipe arrangement direction. And Figure 16 Figure 16 shows another flat pipe adapter assembly 100. Although the structure of the flat pipe adapter 10 is different, the plurality of adapter holes 120 are also misaligned and distributed in the flat pipe arrangement direction, and the center connection line of the plurality of adapter holes 120 also forms a broken line in the flat pipe arrangement direction (such as the dotted line in Figure 16 ). Although Figure 15 and Figure 16 take the example that each adapter hole 120 is misaligned relative to the adjacent adapter hole 120 for illustration. However, the present invention does not make any limitation in this regard. In other embodiments, it is also possible to set the positions of some adapter holes 120 to be offset relative to other adapter holes 120. In addition, in other embodiments, it is also possible to set that the flat pipe adapter assembly includes flat pipe adapters with various structures, and the distribution positions of the adapter holes of different flat pipe adapters are different; this setting can also achieve the misaligned distribution of all or part of the adapter pipes.

[0088] As shown Figure 8 and Figure 9 in Figure 8 and Figure 9 , in the parallel flow heat exchanger provided in this embodiment, the header pipe 400 and the flat pipe adapter assembly 100 are relatively distributed at the other end of the flat pipe 200, and the flat pipe 200 is a U-shaped pipe with two bending parts 201. However, the present invention does not make any limitation in this regard. In other embodiments, it is also possible to set the flat pipe to be a straight pipe, or a U-shaped pipe with four or more even numbers of bending parts.

[0089] Figure 17The parallel flow heat exchanger provided by another embodiment of the present invention is shown as follows. In this structure, the header 400 and the flat tube adapter assembly 100 are located at the same end of the flat tubes 200. The flat tubes 200 are U-shaped tubes with a single bending portion 201. The refrigerant output end of each flat tube 200 is connected to the header 400 through an adapter elbow 700. Figure 18 It is a schematic structural diagram of the adapter elbow 700. However, the present invention does not make any limitation in this regard. In other embodiments, multiple rows of flat tubes 200 may also be provided on the parallel flow heat exchanger, and adjacent flat tubes 200 are connected across rows through the adapter elbow 700. As Figure 19 shown, there are two rows of flat tubes 200 with the same number on the parallel flow heat exchanger, and the corresponding flat tubes between the two rows are connected across rows through the adapter elbow 700.

[0090] Although this embodiment is described by taking the flat tube 200 having a single bending portion 201 as an example. However, the present invention does not make any limitation in this regard. In other embodiments, the number of bending portions on the flat tube may also be set to an odd number greater than three.

[0091] Although this embodiment is described by taking the flat tube adapter assembly 100 being connected to multiple branch pipes 501 on the refrigerant distributor 500 as an example. However, the present invention does not make any limitation in this regard. In other embodiments, it may also be set that the parallel flow heat exchanger 600 includes a refrigerant collector, and multiple branch pipes on the refrigerant collector are respectively connected to corresponding adapter pipes 30 on the flat tube adapter assembly 100 by flame brazing. Or, it is set that the parallel flow heat exchanger 600 includes a refrigerant distributor 500 and a refrigerant collector; there are two flat tube adapter assemblies 100 in the parallel flow heat exchanger 600, one of which is connected to the refrigerant distributor 500 and the other is connected to the refrigerant collector.

[0092] Although this embodiment is described by taking the application of the flat tube adapter 10 on the parallel flow heat exchanger 600 as an example. However, the present invention does not make any limitation in this regard. The flat tube adapter provided in this embodiment is also applicable to the adapter between the flat tube and the circular pipe fitting in the water pipeline system.

[0093] Correspondingly, this embodiment also provides a refrigeration device, which includes the parallel flow heat exchanger 600 provided in this embodiment.

[0094] Embodiment 2

[0095] This embodiment is basically the same as Embodiment 1 and its variations, the difference being that the structures of the transfer holes 120 and the transfer channels 130 on the flat tube adapter 10 are different.

[0096] As Figure 20 、 Figure 21 、 Figure 22 And Figure 23As shown, the second surface 12 where the transfer hole 120 is located is substantially parallel to the first surface 11 where the flat hole 110 is located. The axial direction of the flow channel inlet section 131 is substantially perpendicular to the length direction of the flow channel distribution section 132 and its width W1 is greater than the width W0 of the flat hole 110. The length L1 of the flow channel distribution section 132 is greater than the aperture D0 of the transfer hole 120. One end of the flow channel distribution section 132 extends to a third surface 13 that is perpendicular to or intersects the first surface 11 where the flat hole is located and is blocked. The third surface 13 refers to another surface of the transfer body 1 that is different from the first surface 11 where the flat hole is located and the second surface 12 where the transfer hole is located.

[0097] Similar to Embodiment 1, in the flat tube adapter 10 provided in this embodiment, the transfer hole 120 and the flat hole 110 are still connected through a long chamber with a width greater than the width W0 of the flat hole. This long chamber forms the flow channel distribution section 132, which reduces the refrigerant flow resistance while realizing the connection between the flat tube and the circular pipe fitting.

[0098] In this embodiment, the cross-section of the flow channel distribution section 132 is set to be circular and its diameter (i.e., width W1) is substantially close to the aperture D0 of the transfer hole 120 to simplify the processing technology. However, the present invention does not make any limitation in this regard. In other embodiments, the cross-section of the flow channel distribution section may also be other shapes such as rectangular, elliptical or racetrack-shaped; its width W1 may also be greater than the width W0 of the flat tube and less than the aperture of the transfer hole.

[0099] In this embodiment, the end of the flow channel distribution section 132 that does not extend to the surface of the transfer body 1 is substantially flush with the edge of the flat hole 110 in the corresponding length direction (i.e., Figure 23 in the figure, the left end of the flow channel distribution section 132 is substantially flush with the left edge of the flat hole 110), while the other end extends past the edge of the flat hole 110 in the corresponding length direction and is located on the third surface 13. This setting makes the length L1 of the flow channel distribution section 132 greater than the length L0 of the flat hole 110, and evenly distributes the refrigerant into multiple micro-channel holes in the length direction of the flat hole 110. In this embodiment, the flat tube adapter assembly 10 further includes a blocking member 2 that blocks the flow channel distribution section 132 on the third surface 13. Specifically, the blocking member 2 is a plug plate embedded in the flow channel distribution section 132 and the plug plate is hermetically connected to the transfer body 1 by brazing. However, the present invention does not make any limitation in this regard.

[0100] Further, in the flat tube adapter 10 provided in this embodiment, on the axial projection plane of the flat hole 110, the projection area of the adapter hole 120 is located on one side in the length direction of the flat hole 110 and they are spaced apart. This setting makes the adapter hole 120 and the flat hole 110 misaligned. The refrigerant input into the adapter hole 120 must be transmitted in the length direction of the flow channel distribution section 132 before being distributed to the multiple micro-channel holes in the flat tube, thus effectively avoiding the problem of uneven distribution caused by the direct passage of the refrigerant. In addition, in this structure, a reflection area 1321' is further formed on the inner wall of the flow channel distribution section 132 opposite to the flow channel inlet section 131 to reflect the input refrigerant to enhance the collision degree of the two-phase flow refrigerant while entering the flow channel distribution section 132, so as to further improve the distribution uniformity.

[0101] However, the present invention does not impose any limitation on the distribution position of the adapter hole 120 on the second surface 12 where it is located. In other embodiments, as Figure 24 shown, the adapter hole 120 can also be arranged to be opposite to the flat hole 110. At this time, in order to prevent the refrigerant input into the adapter hole 120 from directly passing through to some of the micro-channel holes on the flat tube opposite thereto, the flat tube adapter 10 is further provided with a shielding member 3 disposed in the adapter flow channel 130 and opposite to the flow channel inlet section 131. The shielding member 3 partially shields the cross-section of the adapter flow channel 130 where it is located, and when projected along the axial direction of the flat tube 200, the shielding member 3 covers some of the micro-channel holes in the flat tube 200. The input refrigerant passes through the cross-section of the adapter flow channel 130 outside the shielding member 3 and is uniformly mixed in the flow channel distribution section 132 before being distributed into multiple micro-channel holes. In this embodiment, the shielding member 3 is a shielding strip disposed in the flow channel inlet section 131. However, the present invention does not impose any limitation on this.

[0102] Embodiment III

[0103] This embodiment is basically the same as Embodiment II and its variations, except that: the structure of the flow channel distribution section 132 is different.

[0104] As Figure 25 、 Figure 26 、 Figure 27 and Figure 28 shown, the flow channel distribution section 132 is a flat flow channel, its length L1 and width are both basically close to the flat hole, and it is basically coaxial with the flat hole 110.

[0105] Although the width of the flow channel distribution section 132 in the flat tube adapter 10 provided in this embodiment is small. However, compared with the flow-through surface with a width of W0 and a length of only D0 formed by the direct docking of the adapter hole 120 and the flat hole 110 without an adapter flow channel, the flow channel distribution section 132 in this embodiment increases the flow-through surface size in the length direction (from the original D0 to basically close to L0), and can also effectively reduce the flow resistance during refrigerant transfer, and can also achieve uniform distribution of the refrigerant in the length direction of the flat tube.

[0106] Similarly, as Figure 27 and Figure 28 shown, on the axial projection plane of the flat hole 110, the projection area of the transfer hole 120 is located on one side of the flat hole 110 in its length direction and the two are spaced apart. This setting makes the transfer hole 120 and the flat hole 110 staggeredly distributed, and the refrigerant input through the transfer hole 120 must be transmitted in its length direction through the flow channel distribution section 132 before being distributed to the multiple micro-channel holes in the flat tube, thus effectively avoiding the problem of uneven distribution caused by the direct passage of the refrigerant. In addition, in this structure, a reflection area 1321' is further formed on the inner wall of the flow channel distribution section 132 opposite to the flow channel inlet section 131 to reflect the input refrigerant, so that when it enters the flow channel distribution section 132, the collision degree of the two-phase flow refrigerant is enhanced to further improve the distribution uniformity.

[0107] Figure 29 and Figure 30 shown is a schematic structural diagram of the flat tube adapter 10 provided by another embodiment of the present invention. In this structure, the transfer hole 120 and the flat hole 110 are oppositely distributed. Similarly, to prevent the refrigerant input through the transfer hole 120 from directly passing through to some of the micro-channel holes on the flat tube opposite thereto, the flat tube adapter 10 is further provided with a shielding member 3 disposed in the transfer flow channel 130 and opposite to the flow channel inlet section 131. The shielding member 3 partially shields the cross-section of the transfer flow channel 130 where it is located, and when projected along the axial direction of the flat tube 200, the shielding member 3 covers some of the micro-channel holes in the flat tube 200. The input refrigerant passes through the cross-section of the transfer flow channel 130 outside the shielding member 3 and is uniformly mixed in the flow channel distribution section 132 before being distributed into multiple micro-channel holes. In this embodiment, the shielding member 3 is a shielding strip disposed in the flow channel inlet section 131. However, the present invention makes no limitation thereto.

[0108] Embodiment 4

[0109] This embodiment is basically the same as Embodiment 1 and its variations, except that: the numbers of the flat holes 110, the transfer holes 120, and the transfer flow channels 130 on the transfer body 1 are different.

[0110] As Figure 31 and Figure 32 shown, the flat tube adapter 10 includes a plurality of flat holes 110 and a plurality of transfer holes 120 corresponding to each of them one by one. The plurality of flat holes 110 are arranged in a row, and each flat hole 110 and the corresponding transfer hole 120 are connected through a transfer flow channel 130, and the adjacent transfer flow channels 130 are not connected.

[0111] Although Figure 31All the transfer holes 120 are located on the same surface of the transfer body (i.e., the second surface 12), and this second surface 12 is substantially perpendicular to the first surface 11 where the flat hole 110 is located. However, the present invention makes no such limitation. In other embodiments, it is also possible to arrange that all the transfer holes are located on the same surface of the transfer body (i.e., the second surface), and this second surface is substantially parallel to the first surface where the flat hole is located. Or, the surface where some of the transfer holes are located is substantially perpendicular to the surface where their corresponding flat holes are located, while the surface where the other part of the transfer holes are located is substantially parallel to the surface where their corresponding flat holes are located. Specifically, it can be designed and adjusted according to the spatial position of the external circular pipe fitting. In addition, the cross-sectional shape of the flow channel distribution section can also be rectangular, oval, racetrack-shaped or flat (such as Figure 27 and Figure 28 shown).

[0112] Correspondingly, this embodiment provides a flat pipe transfer assembly 100 applicable to a parallel flow heat exchanger, which only includes Figure 31 the integrated flat pipe transfer piece 10 in , and there is no need to provide a connecting piece. Correspondingly, the side plate 300 on the parallel flow heat exchanger can also be directly welded to the transfer body 1.

[0113] In summary, the flat pipe transfer piece provided by the present invention realizes the transfer between the circular pipe fitting and the flat pipe through the flat hole, circular transfer hole and transfer flow channel on the polyhedron transfer body. Compared with the traditional transfer pipe structure with a special-shaped curved surface transition, the present invention only needs to open holes on the transfer body, which not only has a simple structure but also can significantly reduce the processing cost. In the design of the transfer flow channel: the width of the flow channel inlet section is set to be greater than the width of the flat hole, forming a chamber with an enlarged cross-section to reduce the flow resistance of the refrigerant; on this basis, the length of the flow channel distribution section is set to be greater than the aperture of the transfer hole, extending the distribution path of the refrigerant in the length direction of the flat pipe, so that the refrigerant can be evenly distributed to the multiple micro-channel holes in the flat pipe. At the same time, the width of the flow channel inlet section is also limited to be less than the aperture of the transfer hole, and this setting can reduce the size of the transfer body in the width direction so that it can adapt to the limited installation spacing between adjacent flat pipes.

[0114] Furthermore, by arranging a shielding piece in the transfer flow channel or staggering the corresponding transfer holes axially in the flat hole, it is avoided that the refrigerant input from the transfer hole directly passes through to the opposite micro-channel hole to improve the uniform distribution. In addition, the parallel flow heat exchanger provided by the present invention also provides a flat pipe transfer assembly including an integrated flat pipe transfer piece or a plurality of flat pipe transfer pieces connected together through a connecting piece; this setting not only realizes the independent connection of each flat pipe and the corresponding circular pipe fitting, but also provides end fixing for each row of flat pipes and the side plates on both sides thereof, thereby greatly improving the connection strength and stability of the components in the parallel flow heat exchanger.

[0115] Although the present invention has been disclosed above by the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A flat tube adapter, characterized in that: A polyhedral transfer body is provided on the transfer body, on which flat holes, transfer holes corresponding to the flat holes one by one, and transfer channels connecting only each flat hole and the corresponding transfer hole are formed, and the flat holes, transfer holes, and transfer channels are consistent in number and correspond one to one; Each flat hole and the corresponding transfer hole are distributed on two surfaces of the transfer body and the cross section of the transfer hole is basically close to a circle. Each of the transfer flow channels includes: A flow channel inlet section, coaxially connected to the transfer hole and having a width greater than the width of the flat hole and less than or equal to the aperture of the transfer hole; The flow channel distribution section connects the flow channel inlet section and the flat hole and its length direction is substantially perpendicular to the axial direction of the flat hole. The length of the flow channel distribution section is greater than the aperture of the transfer hole.

2. The flat tube adapter according to claim 1, characterized in that: The second surface where the adapter hole is located is perpendicular to or intersects with the first surface where the corresponding flat hole is located. The flow channel inlet section is basically coaxially connected to the flow channel distribution section and the adapter hole. The end of the flow channel distribution section forms a reflection part, which reflects the refrigerant to the flow channel distribution section and then distributes it into the flat tube connected to the flat hole.

3. The flat tube adapter according to claim 1, characterized in that: The second surface where the transfer hole is located is substantially parallel to the first surface where the corresponding flat hole is located, and the axial direction of the flow channel inlet section is substantially perpendicular to the length direction of the flow channel distribution section; The cross-section of the flow channel distribution section is close to a circle, and one end thereof extends to a third surface perpendicular to or intersecting the first surface where the flat hole is located and is blocked; alternatively, the flow channel distribution section is a flat flow channel, and its length and width are basically close to the flat hole and basically coaxial with the flat hole.

4. The flat tube adapter according to claim 3, characterized in that: On the axial projection surface of the flat hole, the projection area of ​​the adapter hole is located on one side in the length direction of the flat hole and the two are spaced apart. The inner wall of the flow channel distribution section opposite to the flow channel inlet section forms a reflection area to reflect the input refrigerant so that it enters the flow channel distribution section.

5. The flat tube adapter according to claim 3, characterized in that: The adapter hole is distributed relative to the flat hole, and the flat tube adapter also includes a shielding member arranged in the adapter flow channel and opposite to the flow channel inlet section, the shielding member partially shields the cross section of the adapter flow channel where it is located, and when projected along the axial direction of the flat tube, the shielding member covers part of the microchannel holes in the flat tube.

6. The flat tube adapter according to claim 1, characterized in that: In the length direction, at least one end of the flow channel distribution section is substantially flush with or extends over the edge of the flat hole in the length direction.

7. The flat tube adapter according to claim 1, characterized in that: The flat tube adapter has a flat hole and a transfer hole, and the flat hole and the transfer hole are connected via a transfer flow channel; Alternatively, the flat tube adapter includes a plurality of flat holes and a plurality of adapter holes corresponding thereto one by one, the plurality of flat holes are distributed in one row or multiple rows and each flat hole is connected to the corresponding adapter hole via a adapter flow channel, and the adapter flow channels are not connected to each other.

8. A parallel flow heat exchanger, characterized in that: include: A flat tube adapter assembly, comprising the flat tube adapter according to claim 1; One or more rows of flat tubes are inserted into and welded to a plurality of adapter holes in the flat tube adapter assembly; The fins are arranged between adjacent flat tubes.

9. The parallel flow heat exchanger according to claim 8, characterized in that: The flat tube adapter assembly includes a plurality of flat tube adapters and a connecting piece, wherein the connecting piece sequentially connects the plurality of flat tube adapters in the arrangement direction of the flat tubes, and the connecting piece is a connecting plate or a connecting rod.

10. The parallel flow heat exchanger according to claim 9, characterized in that: In the flat tube adapter assembly, an assembly adjustment gap is formed between at least two adjacent flat tube adapters, and the structures of the plurality of flat tube adapters are the same, or at least one flat tube adapter is different from the other flat tube adapters.

11. The parallel flow heat exchanger according to claim 8, characterized in that: The flat tube adapter assembly includes a flat tube adapter, which includes a plurality of flat holes and a plurality of adapter holes corresponding to the flat holes. The plurality of flat holes are distributed in one row or multiple rows corresponding to the plurality of flat tubes, and each flat hole is connected to the corresponding adapter hole via a adapter flow channel, and the adapter flow channels are not connected to each other.

12. The parallel flow heat exchanger according to claim 8, characterized in that: The parallel flow heat exchanger further comprises a side plate arranged in parallel on the outer periphery of each row of flat tubes, and the side plate is fixedly connected to the flat tube adapter assembly.

13. The parallel flow heat exchanger according to claim 8, characterized in that: The flat tube adapter assembly, the plurality of flat tubes and the plurality of fins are integrally welded and formed by brazing in a furnace.

14. The parallel flow heat exchanger according to claim 8, characterized in that: The flat tube adapter assembly is used to connect multiple branch pipes on the refrigerant distributor. The parallel flow heat exchanger also includes a header. The header and the flat tube adapter assembly are relatively distributed at the other end of the flat tube. The flat tube is a straight tube or a U-shaped tube with an even number of bends. Alternatively, the collecting pipe and the flat tube adapter assembly are distributed at the same end of the flat tube, and the flat tube is a U-shaped tube with an odd number of bends.

15. The parallel flow heat exchanger according to claim 8, characterized in that: The flat tube adapter assembly also includes a plurality of adapter tubes welded to the plurality of adapter holes, and the adapter tubes are configured to connect to a plurality of branch pipes of a refrigerant distributor or a refrigerant collector.

16. The parallel flow heat exchanger according to claim 15, characterized in that: The end of at least one of the plurality of transition tubes extends beyond the ends of the other transition tubes; Alternatively, at least one transfer tube is bent and extended toward one side of the arrangement direction of the plurality of transfer tubes; Alternatively, the position of at least one adapter hole in the flat tube adapter assembly is offset relative to other adapter holes, so that the plurality of adapter holes are staggeredly distributed along the arrangement direction of the flat tubes.

17. The parallel flow heat exchanger according to claim 15, characterized in that: The parallel flow heat exchanger further comprises a refrigerant distributor, and a plurality of branch pipes on the refrigerant distributor are respectively connected to corresponding transfer pipes on the flat tube transfer assembly by flame brazing; And / or, the parallel flow heat exchanger further comprises a refrigerant collector, and a plurality of branch pipes on the refrigerant collector are respectively connected to corresponding adapter pipes on the flat tube adapter assembly by flame brazing.

18. A refrigeration device, characterized in that: Comprising the parallel flow heat exchanger as described in claim 8.

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