Flat tube adapters, parallel flow heat exchangers and refrigeration equipment

Abstract

The present invention provides a flat tube adapter, a parallel flow heat exchanger and a refrigeration device. The flat tube adapter includes a polyhedron adapter body. The adapter body is formed with flat holes, adapter holes corresponding to the flat holes one by one, and a adapter flow channel that connects only each flat hole and the corresponding adapter hole. The number of flat holes, adapter holes and adapter flow channels is the same and they correspond one to one. Each flat hole and the corresponding adapter hole are distributed on the two surfaces of the adapter body and the cross-section of the adapter hole is basically close to a circle. Each adapter flow channel includes a flow channel inlet section and a flow channel distribution section. The flow channel 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 channel distribution section connects the flow channel 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 channel distribution section is greater than the aperture of the adapter hole.

Description

Technical Field

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

[0002] Parallel flow heat exchangers, also known as microchannel heat exchangers, are widely used in automobile air conditioning condensers and household single cooling air conditioning condensers due to their compact structure, light weight, high heat exchange efficiency, small refrigerant charge, low manufacturing and recycling costs, etc. Figure 1 As shown, in a conventional parallel flow heat exchanger, the ends of the flat tubes 200 are connected to a first header 400a and a second header 400b, respectively. Refrigerant is introduced into the distribution chamber 400a1 of the first header 400a through a first flow conduit 801 and distributed to the first group of flat tubes 200. The refrigerant is then collected by the second header 400b and distributed to the second group of flat tubes 200'. Finally, the refrigerant is collected again in the collection chamber 400a2 of the first header 400a and discharged through the second flow conduit 802. Figure 1 The first group of flat tubes 200 and the second group of flat tubes 20' have the same structure, as shown in the schematic diagram. Figure 2 As shown. Figure 1 When the parallel flow heat exchanger is used as an evaporator, the input refrigerant is in a gas-liquid two-phase state. Due to the different thermodynamic properties and the resultant forces acting on the gas and liquid phases, the refrigerant is prone to phase separation during the distribution process. The refrigerant distributed into the lower flat tubes in the first header has a significantly higher liquid content, while the refrigerant distributed into the upper flat tubes has a higher gas content. This uneven distribution will cause the performance of the heat exchanger to drop sharply.

[0003] To address the problem of uneven refrigerant distribution, conventional parallel flow heat exchangers attempt to add baffles to the first header, but this solution is still difficult to work in situations where the compressor speed is low and the refrigerant flow rate is low. For this reason, some have proposed configuring a refrigerant distributor on the input side of the parallel flow heat exchanger to improve the uniformity of the refrigerant distribution within the multiple flat tubes. However, since the branch pipes of the refrigerant distributor are circular pipes, their structure is completely different from that of the flat tubes, and the two cannot be directly assembled and connected; and on the parallel flow heat exchanger, the spacing between adjacent flat tubes is extremely limited. To address the problem of connecting circular connecting pipes and flat tubes in a limited space, Japanese patent JP2013142454A discloses a pipe joint having a flat tube portion at one end and a circular tube portion at the other end. A skirt portion is formed on the flat tube portion, which expands in diameter along the tube end direction. The skirt portion can support the axial load applied when the circular tube portion is expanded from the other end side. Subsequently, Chinese patent CN217383880U and Chinese patent CN116753766A also proposed similar adapter tubes or adapter components with a flat interface at one end and a circular interface at the other end.

[0004] In this type of solution, to achieve a transitional connection between the circular and flat interfaces, the main body of the adapter tube or adapter component is a special-shaped curved structure. This not only complicates the processing process and increases the processing cost, but also because the cavity structure of the casting mold is closely related to the size of the flat tube or round tube, each specification of the adapter tube or adapter component requires a separate mold. The mold investment cost is very high, making it difficult to expand the adapter structure to match different parallel flow heat exchangers. Furthermore, in traditional parallel flow heat exchangers, the header not only distributes the refrigerant to the multiple flat tubes, but also serves to fix the multiple flat tubes and side plates. However, in Japanese Patent JP2013142454A, Chinese Patent CN217383880U, and Chinese Patent CN116753766A, the use of multiple independent, special-shaped adapter tubes (or adapter components) instead of the integral header in conventional parallel flow heat exchangers renders the ends and side plates of the multiple flat tubes untenable. This leads to problems such as weak connection strength, component displacement, and even falling or falling apart among the multiple flat tubes and fins. Furthermore, the circular interface and the flat interface are essentially coaxial. However, due to the presence of multiple microchannel holes within the flat tubes, this structure results in some microchannel holes intersecting the circular interface, resulting in the shortest flow path length. After the refrigerant is introduced through the circular interface, it directly enters the microchannel hole opposite it due to the difference in flow path length, resulting in uneven refrigerant distribution between different microchannel holes within the same flat hole. Summary of the Invention

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

[0006] In order to achieve the above-mentioned purpose, the first aspect of the present invention provides a flat tube adapter, which includes a polyhedron adapter body. The adapter body is formed with flat holes, adapter holes corresponding to the flat holes one by one, and adapter channels that only connect each flat hole and the corresponding adapter hole. The number of flat holes, adapter holes and adapter channels is consistent and one-to-one corresponding; each flat hole and the corresponding adapter hole are distributed on the two surfaces of the adapter body and the cross-section of the adapter hole is basically close to a circle. Each adapter channel includes a channel inlet section and a channel distribution section. The channel 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 channel distribution section connects the channel 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 channel 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 with the first surface where the flat hole is located, the flow channel inlet section is basically coaxially connected to the flow channel distribution section and the adapter hole, and 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.

[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 a circle, and one end thereof extends to a third surface perpendicular to or intersecting with the first surface where the flat hole is located and is blocked; alternatively, the flow channel distribution section is a flat flow channel, the length and width of which are basically close to the flat hole and basically coaxial with the flat hole.

[0010] According to an embodiment of the first aspect of the present invention, 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. 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 adapter hole and the flat hole are distributed relative to each other, 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 blocks 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.

[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 via a transfer channel;

[0014] Alternatively, the flat tube adapter includes a plurality of flat holes and a plurality of adapter holes corresponding thereto, 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.

[0015] In a second aspect, the present invention further provides a parallel flow heat exchanger comprising a flat tube adapter assembly, one or more rows of flat tubes, and fins. The flat tube adapter assembly comprises the flat tube adapter described above. The one or more rows of flat tubes are inserted into and welded to a plurality of adapter holes within 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, wherein 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, and the structures of the multiple flat tube adapters are the same, or at least one flat tube adapter is different from the 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, which includes a plurality of flat holes and a plurality of adapter holes corresponding thereto. The plurality of flat holes are distributed in one or more 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.

[0019] According to an embodiment of the second aspect of the present invention, the parallel flow heat exchanger further includes a side plate arranged parallel to the outer periphery of each row of flat tubes, and the side plate is 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 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 arranged at the other end of the flat tube relative to each other. The flat tube is a straight tube or a U-shaped tube with an even number of bends.

[0022] 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.

[0023] According to an embodiment of the second aspect of the present invention, the flat tube adapter assembly further 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 the refrigerant distributor or the refrigerant collector.

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

[0025] Alternatively, at least one transfer tube is bent and extended toward one side of the arrangement direction of the multiple transfer tubes;

[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 multiple adapter holes are staggered along the arrangement direction of the flat tubes.

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

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

[0030] In summary, the flat tube adapter provided by the present invention realizes the connection between the circular tube and the flat tube through the flat hole, the circular transfer hole and the transfer channel on the polyhedron transfer body. Compared with the traditional transfer tube structure with irregular curved surface transition, the present invention can directly open the hole on the transfer body, which is not only simple in structure but also can significantly reduce the processing cost. In the design of the transfer 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 tube, so that the refrigerant can be evenly distributed to the multiple microchannel holes in the flat tube. At the same time, the width of the flow channel inlet section is also limited to be smaller than the aperture of the transfer hole. 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 tubes.

[0031] Furthermore, by providing a blocking member within the transfer flow channel or staggering the corresponding transfer holes in the axial direction of the flat holes, the refrigerant inputted through the transfer holes is prevented from directly flowing into the corresponding microchannel holes, thereby improving uniform distribution. Furthermore, the parallel flow heat exchanger provided by the present invention further includes a flat tube transfer assembly comprising a single-piece flat tube transfer member or multiple flat tube transfer members connected together via connectors. This arrangement not only enables independent connection between each flat tube and the corresponding circular pipe, but also provides end fixation for each row of flat tubes and the side plates on either side thereof, thereby significantly improving the connection strength and stability of the various components within the parallel flow heat exchanger.

[0032] In order to make the above and other objects, features and advantages of the present invention more clearly understood, preferred embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Shown is a schematic structural diagram of a traditional parallel flow heat exchanger.

[0034] Figure 2 Shown Figure 1 Schematic diagram of the structure of the medium flat tube.

[0035] Figure 3 FIG2 is a schematic structural diagram of a flat tube adapter provided in Embodiment 1 of the present invention.

[0036] Figure 4 Shown Figure 3 Schematic cross-section diagram.

[0037] Figure 5 Shown Figure 4 Projected view of .

[0038] Figure 6 FIG2 is a schematic cross-sectional view of a flat tube adapter provided by another embodiment of the present invention.

[0039] Figure 7 FIG2 is a perspective schematic diagram of a flat tube adapter provided by another embodiment of the present invention.

[0040] Figure 8 Shown is a schematic structural diagram of the parallel flow heat exchanger (fins removed) provided in Example 1 of the present invention.

[0041] Figure 9 Shown Figure 8 Schematic diagram of the structure after removing the refrigerant distributor.

[0042] Figure 10 Shown Figure 8 Schematic diagram of the structure of the medium flat tube adapter assembly.

[0043] Figure 11 Shown Figure 10 Orthographic projection diagram of .

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

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

[0046] Figure 14 Shown is a three-dimensional schematic diagram of a flat tube adapter assembly in which an adapter tube is bent and extended to one side, provided by another embodiment of the present invention.

[0047] Figure 15 FIG2 is a side view of a flat tube adapter assembly provided by another embodiment of the present invention, in which the center connecting line of the plurality of adapter holes is distributed in a broken line in the arrangement direction of the flat tubes.

[0048] Figure 16 The flat tube adapter provided by another embodiment of the present invention is different from Figure 15 , a side view of a flat tube adapter assembly in which the center lines connecting the multiple adapter holes are still distributed in a broken line in the arrangement direction of the flat tubes.

[0049] Figure 17 Shown is a schematic structural diagram of a parallel flow heat exchanger (without fins) provided in another embodiment of the present invention.

[0050] Figure 18 Shown Figure 17 Schematic diagram of the structure of the intermediate transfer elbow.

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

[0052] Figure 20FIG. 1 is a schematic structural diagram of a flat tube adapter provided in a second embodiment of the present invention.

[0053] Figure 21 Shown Figure 20 Schematic diagram of the structure from another perspective.

[0054] Figure 22 Shown Figure 20 Schematic cross-section diagram.

[0055] Figure 23 Shown Figure 22 Projected view of .

[0056] Figure 24 FIG2 is a schematic structural diagram of a flat tube adapter provided by another embodiment of the present invention.

[0057] Figure 25 FIG. 1 is a schematic structural diagram of a flat tube adapter provided in a third embodiment of the present invention.

[0058] Figure 26 Shown Figure 25 Schematic diagram of the structure from another perspective.

[0059] Figure 27 Shown Figure 25 Schematic cross-section diagram.

[0060] Figure 28 Shown Figure 27 Projected view of .

[0061] Figure 29 FIG2 is a schematic structural diagram of a flat tube adapter provided by another embodiment of the present invention.

[0062] Figure 30 Shown Figure 29 A cross-sectional diagram from another perspective.

[0063] Figure 31 FIG. 1 is a schematic structural diagram of a flat tube adapter provided in a fourth embodiment of the present invention.

[0064] Figure 32 Shown Figure 31 Schematic cross-section diagram. DETAILED DESCRIPTION

[0065] Example 1

[0066] In existing parallel flow heat exchanger flat tube adapter structures, the irregularly curved adapter tubes or adapter components require specialized molds (such as casting molds) to be formed. This not only complicates the manufacturing process but also incurs high costs. Furthermore, replacing the monolithic header in traditional parallel flow heat exchangers with multiple independent, irregularly shaped adapter tubes (or adapter components) removes support from the ends of the flat tubes and side plates within the parallel flow heat exchanger, leading to a series of issues such as weak connection strength and easy disassembly. Furthermore, existing adapter tubes or adapter components also suffer from the drawback of uneven refrigerant distribution due to the refrigerant flowing directly into opposing microchannel holes.

[0067] In view of this, if Figure 3 、 Figure 4 as well as Figure 5 As shown, this embodiment provides a flat tube adapter 10, which includes a polyhedral adapter body 1. The adapter body 1 is formed with flat holes 110, adapter holes 120 corresponding to each flat hole 110, and a transfer channel 130 that connects only each flat hole 110 and the corresponding transfer hole 120. The flat holes 110, transfer holes 120, and transfer channels 130 are identical in number and correspond one to one. When multiple transfer channels are formed on the adapter body 1, the transfer channels are not connected to each other. Each flat hole 110 and the corresponding transfer hole 120 are distributed on two surfaces of the adapter body 1, and the cross-section of the transfer hole 120 is substantially circular. Each transfer channel 130 includes a channel inlet section 131 and a channel distribution section 132. The channel inlet section 131 is coaxially connected to the transfer 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 transfer 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 substantially 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 is basically close to a circle, which means that the cross section of the theoretically designed adapter hole 120 is circular, but due to the influence of shape and position tolerances in the actual processing process, the cross section of the adapter hole 120 may deviate from the theoretical design, so it is described as basically close.

[0069] The flat tube adapter 10 provided in this embodiment requires only drilling holes in the adapter body 1 to conveniently produce the flat hole 110, the circular adapter hole 120, and the adapter channel 130. Compared to existing adapter tubes or components with irregular structures, this design undoubtedly offers a simpler structure and lowers manufacturing costs. Furthermore, to accommodate flat holes 110 and adapter holes 120 of varying sizes, only the front-end tooling for drilling the holes needs to be changed. This significantly reduces the mold costs required to produce flat tube adapters 10 of varying specifications, effectively enabling the expansion of product lines.

[0070] However, since the flat hole 110 is a flat hole with a very small width-to-length ratio, its width W0 is usually only 1.3mm or 2mm, but its length can reach 16mm~26mm, or even longer. The adapter hole 120, on the other hand, needs to match the external circular pipe or adapter tube, so its aperture D0 is usually less than or equal to 8mm. If the circular pipe connected to the adapter hole 120 is directly connected to the flat tube assembled in the flat hole 110, a flow surface with a width of W0 and a length of only D0 will be formed at the connection point between the two. In this case, not only will the refrigerant flow resistance increase dramatically, but the short length of the flow surface will also make it difficult to evenly distribute the refrigerant to the multiple microchannel holes in the flat tube. To this end, this embodiment sets a transfer channel 130 between the flat hole 110 and the adapter hole 120, and sets the width W1 of the channel inlet section 131 to be greater than the width W0 of the flat hole, and sets the length L1 of the channel distribution section 132 to be greater than the aperture D0 of the adapter hole 120. This arrangement creates a long, wide chamber within the adapter body 1 to form the transfer channel 130, effectively reducing flow resistance during refrigerant transfer. Furthermore, the length L1 of the channel distribution section 132 increases the refrigerant's flow range along the length of the flat hole 110, improving the uniformity of refrigerant distribution among the multiple microchannel holes within the flat tube.

[0071] For the transfer channel 130, the larger its width, the smaller the resistance to the circulation of the refrigerant. However, in the parallel flow heat exchanger, multiple flat tubes are distributed in rows in the width direction and the spacing between adjacent flat tubes is very limited, about 8 mm. Taking the flat tube width W0 as 1.3 mm as an example, the center distance between adjacent flat tubes is only 8+0.65+0.65=9.3 mm. Therefore, when designing the transfer channel 130, it is also necessary to take into account the limitation of the installation size. To this end, the present embodiment sets the width W1 at the flow channel inlet section 131 to be less than or equal to the aperture D0 of the transfer hole 120. This setting makes the maximum size of the flat tube adapter 10 in the width direction determined by the width of the second surface 12 where the transfer hole 120 is located. Since the diameter D0 of the adapter hole 120 is substantially the same as the inner diameter of the circular interface of the existing adapter tube, the width of the second surface 12 where the adapter hole 120 is located can also be set to be substantially close to the outer diameter of the circular interface, so that the flat tube adapter 10 provided in this embodiment can be well assembled with the adjacent flat tube. Figure 5 As shown in FIG. 1 , in this embodiment, the width W1 of the flow channel inlet section 131 is equal to the aperture D0 of the transfer hole 120. However, the present invention does not impose any limitation on this. In other embodiments, such as Figure 6 As shown, the width W1 of the flow channel inlet section 131 may also be set to be smaller than the aperture D0 of the transfer hole 120 .

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

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

[0074] like Figure 4 and Figure 5 As shown, in the adapter body 1 provided by this embodiment, the second surface 12 where the adapter 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 adapter hole 120. The external circular pipe is connected to the adapter hole 120, and the refrigerant input therein is coaxially injected into the flow channel distribution section 132 through the flow channel inlet section 131, and then distributed into the multiple microchannel holes of the flat tube. In this structure, the adapter hole 120 and the flat hole 110 are staggered at 90 degrees. This setting forces the input refrigerant to be transmitted through the flow channel distribution section 132 before being distributed to the multiple microchannel holes of the flat tube, thereby greatly improving the uniformity of the refrigerant distribution and effectively solving the problem of uneven distribution caused by the input refrigerant directly passing through some microchannel holes in the flat tube in existing adapter tubes or adapter components. In addition, a reflection portion 1321 is formed at the end of the flow channel distribution section 132, and the input refrigerant collides with the reflection portion 1321 and then reflects back to the flow channel distribution section 132; this process can increase the collision degree of the gas-liquid two-phase refrigerant, promote the full mixing of the two-phase flow to further improve the uniformity of the refrigerant distribution.

[0075] In this embodiment, Figure 5 As shown, one end of the flow channel distribution section 132 communicating with the flow channel inlet section 131 is substantially close to the edge of the flat hole 110 near the transfer hole 120 (i.e. Figure 5 The right end of the middle flow channel distribution section 132 is basically close to the right edge of the flat hole 110), and the location of the reflector 1321 is basically flush with the other edge of the flat hole 110 in the length direction (ie Figure 5The left edge of the flat hole 110). This arrangement 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 impose any limitation on this. In other embodiments, it is also possible to arrange that the reflective portion extends over 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 over 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 in this case, the flow area in the flow channel distribution section is still larger than the flow surface with a width of only W0 and a length of only D0 formed when the transfer tube and the flat tube are directly connected.

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

[0077] Accordingly, this embodiment also provides a parallel flow heat exchanger 600 including the flat tube adapter 10. Figure 8 As shown, the parallel flow heat exchanger provided in this embodiment includes a flat tube adapter assembly 100, a row of flat tubes 200, and fins ( Figure 8 (not shown), manifold 400, and refrigerant distributor 500. The flat tube adapter assembly 100 includes multiple flat tube adapters 10 provided in this embodiment, i.e., each flat tube adapter 10 has only one flat hole 110, one adapter hole 120, and a transfer channel 130 connecting the two. The end of each flat tube 200 is inserted and welded into the flat hole 110 on the corresponding flat tube adapter 10. The circular branch pipe 501 on the refrigerant distributor 500 is welded to the adapter hole 120 via the adapter pipe 30, thereby achieving the transition from the flat tube 200 to the circular branch pipe 501. For ease of understanding, Figure 8 The figure only shows a parallel flow heat exchanger structure with five U-shaped flat tubes 200. However, the present invention is not limited to this. In an actual parallel flow heat exchanger, the number of flat tubes 200 is large, and can be as high as dozens or even hundreds.

[0078] Although this embodiment illustrates the multiple flat tube adapters 10 within the flat tube adapter assembly 100 as having identical structures, the present invention is not limited thereto. In this embodiment, the structures of the multiple flat tube adapters may not be identical. For example, some flat tube adapters may have only one flat hole, one adapter hole, and one adapter channel, while others may have multiple flat holes, multiple corresponding adapter holes, and multiple independent adapter channels. Alternatively, some flat tube adapters may have different adapter channel structures and adapter hole distribution than others.

[0079] In this embodiment, if Figure 8 and Figure 10 As shown, the flat tube adapter assembly 100 further includes a connector 20, which sequentially connects the plurality of flat tube adapters 10 in the direction of arrangement of the flat tubes 200. The connector 20 connects the plurality of flat tube adapters 10 together, securing the ends of each flat tube 200 through each flat tube adapter 10. Furthermore, the parallel flow heat exchanger further includes side plates 300 disposed parallel to the outer periphery of each row of flat tubes 200, with the ends of the side plates 300 also fixedly connected to the connector 20. This securement of the ends of the flat tubes 200 provides the parallel flow heat exchanger provided in this embodiment with the advantages of high connection strength and stability.

[0080] like Figure 10 and Figure 11 As shown, the connecting member 20 is a connecting rod. Each flat tube adapter 10 also has a connecting hole 140 whose axis is parallel to the width of the flat hole. The connecting rod passes through the connecting hole 140 of each flat tube adapter 10, sequentially connecting multiple flat tube adapters 10 in the direction of the flat tube 200 arrangement. Furthermore, because the position of multiple flat tubes 200 in the parallel flow heat exchanger is essentially fixed, the accumulation of geometric and positional tolerances among the multiple flat tube adapters 10 after being sequentially connected can cause some flat holes 110 to misalign with the corresponding flat tubes 200. To address this issue, this embodiment provides an assembly adjustment gap 101 between adjacent flat tube adapters 10. During assembly, the position of adjacent flat tube adapters 10 is adjusted to eliminate the accumulated geometric and positional tolerances, ensuring that each flat tube 200 fits into its corresponding flat hole 110. In this embodiment, the flat tube adapters 10 are secured to the connecting rod (connecting member 20) by brazing. However, this is not a limitation of the present invention. In other embodiments, the flat tube adapter may be connected to the connecting rod by self-fluxing spot welding or mechanical fixing (such as thread locking).

[0081] Although the present embodiment is described with the connecting member 20 being a connecting rod, the present invention does not limit this in any way. In other embodiments, such as Figure 12As shown, the connecting member 20 may also be a connecting plate. A row of assembly holes is formed on the connecting plate 20, and the plurality of flat tube adapters 10 are sequentially assembled in the corresponding assembly holes.

[0082] In this embodiment, if Figure 8 、 Figure 10 as well as Figure 11 As shown, the flat tube adapter assembly 100 also includes multiple adapter tubes 30 with nearly circular cross-sections welded to the multiple adapter holes 120. The adapter tubes 30 are configured to connect to multiple 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 connector 20) and assembling the corresponding flat tube 200 and adapter tube 30, the flat tube adapter assembly 100, the multiple flat tubes 200, the multiple fins, and the side plates 300 are brazed in a furnace to form an integrated structure. Specifically, the flat tube adapter 10, adapter tube 30, flat tube 200, and fins are all made of aluminum or an aluminum alloy; the connector 20 is also made of aluminum or an aluminum alloy, or alternatively, of higher-strength carbon steel or a carbon steel alloy. However, this is not a limitation of the present invention.

[0083] In this embodiment, the multiple branch pipes 501 on the refrigerant distributor 500 are welded to the adapter pipe 30 by flame brazing. The provision of the adapter pipe 30 extends the distance between the welding position of the branch pipe and the flat hole 110, reducing the effect of the welding heat during the flame brazing of the adapter pipe 30 on the secondary welding at the welding point between the flat hole 110 and the flat pipe 200, thereby effectively avoiding leakage problems caused by secondary welding. Figure 8 As shown, in the parallel flow heat exchanger provided in this embodiment, each flat tube 200 has multiple bends 201. The more bends 201 there are, the greater the spacing between the inlet ends of adjacent flat tubes 200 (i.e., the greater the spacing between adjacent flat holes 110). This arrangement significantly reduces the impact of welding heat on adjacent transfer tubes 30 during flame brazing. In this embodiment, each transfer tube 30 is straight and of equal length. However, this is not a limitation of the present invention.

[0084] In other embodiments, when the flat tubes 200 are straight or have only one bend, the spacing between adjacent flat tube inlet ends is relatively small. Accordingly, the spacing between adjacent flat holes 110 and adjacent adapter holes 120 on the adapter body 1 is relatively small, resulting in extremely limited space between adjacent adapter tubes 30. When flame brazing the adapter tubes 30 and the external circular pipe, the welding heat can easily radiate to adjacent adapter tubes 30, causing secondary welding problems. To address this issue, the flat tube adapter assembly 100 provided in this embodiment can also increase the spacing between adjacent adapter tubes 30 to facilitate welding by adjusting the length and extension direction of the adapter tubes 30, or by adjusting the position of each adapter hole 120 on the corresponding adapter body 1.

[0085] like Figure 13 As shown, the multiple transition tubes 30 are straight, but the end of at least one transition tube 30 extends beyond the ends of the other transition tubes 30; that is, at least one transition tube 30 is different in length from the others. This arrangement allows for adjustment of the welding position between adjacent transition tubes 30 to avoid secondary welding problems on adjacent transition tubes.

[0086] like Figure 14 As shown, at least one transfer tube 30 is provided to bend and extend toward one side of the arrangement direction of the plurality of transfer tubes 30 to increase the welding space between adjacent transfer tubes 30 .

[0087] Correspondingly, the position of the adapter hole 120 on the adapter body 1 can be adjusted to make the corresponding adapter tubes 30 misaligned, thereby solving the problem of secondary welding. Figure 15 As shown, in the flat tube adapter assembly 100, each adapter hole 120 is offset relative to the adjacent adapter hole 120, and the center line of the plurality of adapter holes 120 forms a broken line in the direction of arrangement of the flat tubes (such as Figure 15 The dotted line in the figure) indicates that the plurality of transfer holes 120 are staggered in the arrangement direction of the flat tubes. Figure 16 Another flat tube adapter assembly 100 is shown. Although the structure of the flat tube adapter 10 is different, the multiple adapter holes 120 are also staggered in the arrangement direction of the flat tubes. The center line of the multiple adapter holes 120 also forms a broken line in the arrangement direction of the flat tubes (e.g. Figure 16 ). Although Figure 15 and Figure 16 The following example illustrates a configuration in which each adapter hole 120 is offset relative to adjacent adapter holes 120. However, the present invention is not limited to this configuration. In other embodiments, the positions of some adapter holes 120 may be offset relative to other adapter holes 120. Furthermore, in other implementations, the flat tube adapter assembly may include flat tube adapters of various configurations, with the adapter holes arranged in different locations. This configuration can also achieve a staggered distribution of all or part of the adapter tubes.

[0088] like Figure 8 and Figure 9 As shown, in the parallel flow heat exchanger provided in this embodiment, the header 400 and the flat tube adapter assembly 100 are located opposite each other at the other end of the flat tube 200. The flat tube 200 is a U-shaped tube having two bends 201. However, the present invention is not limited to this. In other embodiments, the flat tubes may be straight tubes or U-shaped tubes having an even number of bends, four or more.

[0089] Figure 17The figure shows a parallel flow heat exchanger provided by another embodiment of the present invention. In this structure, the header 400 and the flat tube adapter assembly 100 are located at the same end of the flat tube 200. The flat tube 200 is a U-shaped tube with a single bend 201. The refrigerant output end of each flat tube 200 is connected to the header 400 via an adapter elbow 700. Figure 18 Schematic diagram of the specific structure of the transfer elbow 700. However, the present invention does not impose any limitation on this. In other embodiments, the parallel flow heat exchanger may also be provided with multiple rows of flat tubes 200, and adjacent flat tubes 200 are connected across rows via transfer elbows 700. Figure 19 As shown, two rows of flat tubes 200 of the same number are provided on the parallel flow heat exchanger, and corresponding flat tubes in the two rows are connected across the rows via transition elbows 700 .

[0090] Although this embodiment uses a single curved portion 201 on the flat tube 200 as an example for description, the present invention is not limited thereto. In other embodiments, the number of curved portions on the flat tube may be an odd number greater than three.

[0091] Although this embodiment uses the example of connecting the flat tube adapter assembly 100 to the multiple branch pipes 501 on the refrigerant distributor 500, the present invention is not limited to this. In other embodiments, the parallel flow heat exchanger 600 may include a refrigerant collector, and the multiple branch pipes on the refrigerant collector may be flame-brazed to the corresponding adapter pipes 30 on the flat tube adapter assembly 100. Alternatively, the parallel flow heat exchanger 600 may include a refrigerant distributor 500 and a refrigerant collector; the parallel flow heat exchanger 600 may include two flat tube adapter assemblies 100, one of which is connected to the refrigerant distributor 500 and the other is connected to the refrigerant collector.

[0092] Although this embodiment uses the flat tube adapter 10 in a parallel flow heat exchanger 600 as an example, the present invention is not limited thereto. The flat tube adapter provided in this embodiment can also be used to connect flat tubes and round pipes in a water piping system.

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

[0094] Example 2

[0095] This embodiment is basically the same as the first embodiment and its variations, except that the structures of the adapter hole 120 and the adapter channel 130 on the flat tube adapter 10 are different.

[0096] like Figure 20 、 Figure 21 、 Figure 22 as well as Figure 23As shown, the second surface 12 where the adapter 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 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 adapter 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 on the adapter body 1 that is different from the first surface 11 where the flat hole is located and the second surface 12 where the adapter hole is located.

[0097] Similar to the first embodiment, in the flat tube adapter 10 provided in this embodiment, the adapter hole 120 and the flat hole 110 are still connected by a long chamber whose width is greater than the flat hole width W0. The long chamber forms a flow distribution section 132, which reduces the refrigerant flow resistance while realizing the adapter between the flat tube and the round tube.

[0098] In this embodiment, the cross-section of the flow channel distribution section 132 is circular, and its diameter (i.e., width W1) is substantially close to the diameter D0 of the adapter hole 120 to simplify the manufacturing process. However, the present invention is not limited to this. In other embodiments, the cross-section of the flow channel distribution section may also have other shapes, such as a rectangle, an ellipse, or a racetrack shape; its width W1 may also be greater than the width W0 of the flat tube and less than the diameter D0 of the adapter hole.

[0099] In this embodiment, the end of the flow channel distribution section 132 that does not extend to the surface of the adapter body 1 is substantially flush with the edge of the flat hole 110 in the corresponding length direction (ie Figure 23 In the embodiment, 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 thereof extends over the edge of the flat hole 110 in the corresponding length direction and is located on the third surface 13. This arrangement enables the length L1 of the flow channel distribution section 132 to be greater than the length L0 of the flat hole 110, and the refrigerant is evenly distributed to multiple microchannel holes in the length direction of the flat hole 110. In this embodiment, the flat tube adapter assembly 10 also includes a sealing member 2 for sealing the flow channel distribution section 132 on the third surface 13. Specifically, the sealing member 2 is a plug plate embedded in the flow channel distribution section 132 and the plug plate is sealed and connected to the adapter body 1 by brazing. However, the present invention does not impose any limitation on this.

[0100] Furthermore, in the flat tube adapter 10 provided in this embodiment, on the axial projection surface of the flat hole 110, the projection area of ​​the adapter hole 120 is located on one side of the flat hole 110 in the length direction, and the two are spaced apart. This arrangement causes the adapter hole 120 and the flat hole 110 to be staggered, and the refrigerant inputted into the adapter hole 120 must be transmitted in its length direction through the flow channel distribution section 132 before it can be distributed to the multiple microchannel holes in the flat tube, thereby effectively avoiding the uneven distribution problem caused by the direct passage of the refrigerant. In addition, in this structure, a reflection area 1321' is formed on the inner wall of the flow channel distribution section 132 opposite to the flow channel inlet section 131, which reflects the input refrigerant so that it enters the flow channel distribution section 132 while enhancing the collision degree of the two-phase flow refrigerant to further improve the distribution uniformity.

[0101] However, the present invention does not impose any limitation on the distribution position of the transfer holes 120 on the second surface 12. In other implementations, such as Figure 24 As shown, the adapter hole 120 and the flat hole 110 can also be arranged to be distributed relative to each other. At this time, in order to prevent the refrigerant input from the adapter hole 120 from directly passing into the part of the microchannel hole opposite to it on the flat tube, the flat tube adapter 10 is provided to also include a shielding member 3 arranged in the adapter flow channel 130 and opposite to the flow channel inlet section 131. The shielding member 3 partially blocks 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 part of the microchannel holes in the flat tube 200. The input refrigerant passes through the cross section of the adapter flow channel 130 on the periphery of the shielding member 3, and is evenly mixed in the flow channel distribution section 132 before being distributed into multiple microchannel holes. In this embodiment, the shielding member 3 is a shielding strip arranged in the flow channel inlet section 131. However, the present invention does not impose any limitation on this.

[0102] Example 3

[0103] This embodiment is basically the same as the second embodiment and its variations, with the difference being that the structure of the flow channel distribution section 132 is different.

[0104] like Figure 25 、 Figure 26 、 Figure 27 as well as Figure 28 As shown, the flow channel distribution section 132 is a flat flow channel, the length L1 and width of which are substantially close to the flat hole, and the channel is substantially 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 relatively small, compared to the flow surface with a width of W0 and a length of D0 formed by the direct connection between the adapter hole 120 and the flat hole 110 without a transfer channel, the flow channel distribution section 132 in this embodiment has a larger flow surface size in the longitudinal direction (increased from the original D0 to approximately L0). This effectively reduces the flow resistance during refrigerant transfer and achieves uniform distribution of refrigerant along the length of the flat tube.

[0106] Similarly, if Figure 27 and Figure 28 As shown, on the axial projection surface of the flat hole 110, the projection area of ​​the adapter hole 120 is located on one side of the flat hole 110 in its longitudinal direction and the two are spaced apart. This arrangement causes the adapter hole 120 and the flat hole 110 to be staggered. The refrigerant inputted from the adapter hole 120 must be transmitted along its longitudinal direction through the flow channel distribution section 132 before being distributed to the multiple microchannel holes in the flat tube, thereby effectively avoiding the uneven distribution problem caused by direct passage of the refrigerant. In addition, in this structure, a reflection area 1321' is formed on the inner wall of the flow channel distribution section 132 opposite to the flow channel inlet section 131, which reflects the input refrigerant, thereby enhancing the collision degree of the two-phase flow refrigerant while allowing it to enter the flow channel distribution section 132, thereby further improving the distribution uniformity.

[0107] Figure 29 and Figure 30 The figure shows a schematic structural diagram of a flat tube adapter 10 provided in another embodiment of the present invention. In this structure, the adapter hole 120 is arranged opposite the flat hole 110. Similarly, to prevent the refrigerant input from the adapter hole 120 from directly passing into the portion of microchannel holes on the flat tube opposite it, the flat tube adapter 10 also includes a shielding member 3 disposed within the adapter flow channel 130 and opposite the flow channel inlet section 131. The shielding member 3 partially blocks 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 a portion of the microchannel holes within the flat tube 200. The input refrigerant passes through the cross section of the adapter flow channel 130 on the periphery of the shielding member 3, is evenly mixed within the flow channel distribution section 132, and is then distributed into the multiple microchannel holes. In this embodiment, the shielding member 3 is a shielding strip disposed within the flow channel inlet section 131. However, the present invention is not limited to this.

[0108] Example 4

[0109] This embodiment is basically the same as the first embodiment and its variations, with the difference being that the number of the flat holes 110 , the adapter holes 120 , and the adapter flow channels 130 on the adapter body 1 is different.

[0110] like Figure 31 and Figure 32 As shown, the flat tube adapter 10 includes a plurality of flat holes 110 and a plurality of corresponding adapter holes 120 . The plurality of flat holes 110 are arranged in a row and each flat hole 110 is connected to the corresponding adapter hole 120 via a adapter channel 130 , while adjacent adapter channels 130 are not connected.

[0111] although Figure 31All the adapter holes 120 are located on the same surface of the adapter body (i.e., the second surface 12) and the second surface 12 is substantially perpendicular to the first surface 11 where the flat holes 110 are located. However, the present invention does not impose any limitation on this. In other embodiments, it can also be provided that all the adapter holes are located on the same surface of the adapter body (i.e., the second surface) and the second surface is substantially parallel to the first surface where the flat holes are located. Alternatively, the surface where some of the adapter holes are located is substantially perpendicular to the surface where their corresponding flat holes are located, while the surface where another part of the adapter holes are located is substantially parallel to the surface where their corresponding flat holes are located. The specific design and adjustment can be made according to the spatial position of the external circular pipe. In addition, the cross-sectional shape of the flow channel distribution section can also be rectangular, elliptical, racetrack-shaped or flat (such as Figure 27 and Figure 28 shown).

[0112] Accordingly, this embodiment provides a flat tube adapter assembly 100 suitable for a parallel flow heat exchanger, which only includes Figure 31 The integrated flat tube adapter 10 is used without the need for connectors. Accordingly, the side plates 300 on the parallel flow heat exchanger can also be directly welded to the adapter body 1.

[0113] In summary, the flat tube adapter provided by the present invention realizes the connection between the circular tube and the flat tube through the flat hole, the circular transfer hole and the transfer channel on the polyhedron transfer body. Compared with the traditional transfer tube structure with irregular curved surface transition, the present invention can directly open the hole on the transfer body, which is not only simple in structure but also can significantly reduce the processing cost. In the design of the transfer 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 tube, so that the refrigerant can be evenly distributed to the multiple microchannel holes in the flat tube. At the same time, the width of the flow channel inlet section is also limited to be smaller than the aperture of the transfer hole. 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 tubes.

[0114] Furthermore, by providing a blocking member within the transfer flow channel or staggering the corresponding transfer holes in the axial direction of the flat holes, the refrigerant inputted through the transfer holes is prevented from directly flowing into the corresponding microchannel holes, thereby improving uniform distribution. Furthermore, the parallel flow heat exchanger provided by the present invention further includes a flat tube transfer assembly comprising a single-piece flat tube transfer member or multiple flat tube transfer members connected together via connectors. This arrangement not only enables independent connection between each flat tube and the corresponding circular pipe, but also provides end fixation for each row of flat tubes and the side plates on either side thereof, thereby significantly improving the connection strength and stability of the various components within the parallel flow heat exchanger.

[0115] Although the present invention has been disclosed above by means of preferred embodiments, this is not intended to limit the present invention. Anyone skilled in the art may make slight changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of protection required by the claims.

Claims

1. A flat tube adapter, characterized in that: The adapter body comprises a cubic adapter body, on which are formed flat holes, adapter holes corresponding to the flat holes one by one, and adapter channels connecting only each flat hole and the corresponding adapter hole, wherein the flat holes, adapter holes, and adapter channels are identical 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 substantially circular. Each transfer flow channel includes: The flow channel inlet section is coaxially connected to the adapter hole and has a width greater than the width of the flat hole and less than or equal to the diameter of the adapter hole; the maximum dimension of the flat tube adapter in the width direction is determined by the width of the second surface where the adapter hole is located, and the width of the second surface where the adapter hole is located is substantially close to the diameter of the adapter 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 with the first surface where the flat hole is located and is blocked; alternatively, the flow channel distribution section is a flat flow channel, the length and width of which 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. 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.

5. The flat tube adapter according to claim 3, characterized in that: The adapter hole is distributed opposite 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 blocks 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 beyond 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 through a transfer channel; Alternatively, the flat tube adapter includes a plurality of flat holes and a plurality of adapter holes corresponding thereto, 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. The connecting piece sequentially connects the plurality of flat tube adapters in the arrangement direction of the flat tubes. 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. The structures of the multiple 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 thereto. The plurality of flat holes are distributed in one or more 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 includes a side plate arranged parallel to 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 distributed opposite to each other 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 further includes a plurality of adapter tubes welded to the plurality of adapter holes, and the adapter tubes are configured to be connected 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 multiple transfer tubes; 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 staggered 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 includes a refrigerant distributor, wherein 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 includes a refrigerant collector, and a plurality of branch pipes on the refrigerant collector are respectively connected to corresponding transfer pipes on the flat tube transfer assembly by flame brazing.

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

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