Micro-channel heat exchanger

Abstract

The utility model belongs to refrigeration technical field, specifically discloses a kind of microchannel heat exchanger, it can obviously improve condenser drainage performance and delay frost phenomenon to occur, improve heat exchanger heat exchange efficiency.The microchannel heat exchanger provided by the utility model, including several parallelly arranged microchannel flat tubes, two adjacent microchannel flat tubes are connected by connecting piece;The middle part of connecting piece is equipped with drain hole;Multi-union microchannel flat tube is arranged with several fins in length direction, the side of fin is provided with notch, multi-union microchannel flat tube is inserted into notch, and drain unit is equipped on fin, every drain unit two water guide ribs, the bottom of two water guide ribs and the drain hole of connecting piece on its downside correspond;The notch of fin is equipped with fin turnup, the position of fin turnup corresponding drain hole is equipped with fin turnup gap, drain unit, fin turnup gap and multi-union microchannel flat tube drain hole are interconnected in vertical direction, and continuous drainage passage is established between fin and microchannel flat tube.

Description

Technical Field

[0001] This utility model belongs to the field of refrigeration technology and relates to a microchannel heat exchanger. Background Technology

[0002] For low-temperature and high-humidity environments, finned heat exchangers are currently the main type used. For example, Chinese patent CN222528380U discloses a microchannel heat exchanger and HVAC equipment incorporating it. This is a plug-in finned microchannel heat exchanger, which has the following drawbacks: 1. In the radial direction of the microchannel, the alignment of the insert-type fins is poor, and there is misalignment; in the axial direction of the microchannel, the fins are discontinuous and there are gaps. 2. Water tends to accumulate at the opening side of the fins in interlocking fins; 3. The drainage process of this plug-in finned heat exchanger is long.

[0003] The above-mentioned drawbacks can cause poor drainage, which in turn leads to frost formation on the heat exchanger. The thickening of the frost layer will increase air-side resistance, ultimately resulting in adverse consequences: firstly, a significant reduction in the heat exchanger's heat exchange efficiency, leading to increased energy consumption; and secondly, the thickening of the frost layer blocking the airflow channels, causing equipment vibration. Summary of the Invention

[0004] In view of this, the present invention provides a microchannel heat exchanger, which can significantly improve the drainage performance of the condenser and delay the occurrence of frost, thereby improving the heat exchange efficiency of the heat exchanger.

[0005] To address the aforementioned problems, embodiments of this utility model provide a microchannel heat exchanger, characterized in that: The device includes a multi-channel flat tube, which comprises several parallel microchannel flat tubes connected to each other via a connector; the connector has a drainage hole in the middle. The multi-channel flat tube has several fins arranged along its length. Each fin includes a sheet-like main plate with a slot on one side. The multi-channel flat tube is inserted into the slot. Each fin has a drainage unit with two water guide ribs arranged in parallel or in an inverted V-shape. The bottom of each water guide rib corresponds to the drainage hole of the connector below it. The slot of the fin has a fin flange, and the fin flange has a notch corresponding to the position of the drainage hole. The drainage unit, the fin flange notch, and the drainage hole of the multi-channel flat tube are connected vertically, establishing a continuous drainage channel between the fin and the microchannel flat tube.

[0006] Furthermore, the slots of the fins are inclined, and the inclination angle between the slot direction and the horizontal direction is 0° to 3°.

[0007] Furthermore, the width of the drain hole of the connector is greater than or equal to 2 mm, and the distance between two adjacent fins is greater than or equal to 1.3 mm; the difference between the width of the connector and the width of the drain hole is less than or equal to 1.0 mm; the width of the fin flange notch is 0% to 140% of the width of the drain hole.

[0008] Furthermore, the ratio of the top spacing of the two water guide ribs on the fin to the width of the drain hole of the connector is 100-120%, the ratio of the bottom spacing of the two water guide ribs on the fin to the width of the drain hole of the connector is 60-100%, and the fin width is greater than or equal to 25mm.

[0009] Furthermore, the sheet-like mainboard has several slots arranged in an array along its height, and these slots are parallel to each other. Each slot contains a multi-channel flat tube, and the drainage holes of the connectors within these multi-channel flat tubes correspond vertically. The fin guide ribs, fin flange notches, and drainage holes of the multi-channel flat tubes are vertically connected, creating a continuous drainage channel between the fins and the microchannel flat tubes.

[0010] Furthermore, the microchannel heat exchanger also includes a first pressure block assembly, a first manifold assembly, a second manifold assembly, and a second pressure block assembly; the first pressure block assembly is connected to the first manifold assembly, and the two ends of the multi-channel flat tube are respectively inserted into the flat tube grooves of the first manifold assembly and the second manifold assembly. The second manifold assembly is connected to the second pressure block assembly. The heat exchange medium enters the first manifold assembly from the first pressure block assembly, and the heat exchange medium in the first manifold assembly flows through the multi-channel flat tube into the second manifold assembly. The heat exchange medium in the second manifold assembly flows out of the heat exchanger through the second pressure block assembly.

[0011] Furthermore, the microchannel heat exchanger also includes a third pressure block assembly, a third manifold assembly, a fourth manifold assembly, and a fourth pressure block assembly; the two ends of the multi-channel flat tube are respectively inserted into the flat tube grooves of the third manifold assembly and the fourth manifold assembly, the third manifold assembly is connected to the third pressure block assembly and the fourth pressure block assembly respectively, the heat exchange medium enters the third manifold assembly from the fourth pressure block assembly, the heat exchange medium in the third manifold assembly flows through the multi-channel flat tube into the fourth manifold assembly, and the heat exchange medium in the fourth manifold assembly flows out of the heat exchanger through the fourth pressure block assembly.

[0012] Furthermore, the microchannel heat exchanger also includes a distributor, a fifth manifold assembly, a sixth manifold assembly, a seventh manifold assembly, and an aluminum base; the multi-channel flat tube includes a first microchannel flat tube and a second microchannel flat tube; the heat exchange medium is evenly distributed by the distributor into the fifth manifold assembly, the heat exchange medium in the fifth manifold assembly flows into the sixth manifold assembly through the first microchannel flat tube in the multi-channel flat tube, and then flows into the seventh manifold assembly through the second microchannel flat tube in the multi-channel flat tube, and the heat exchange medium in the seventh manifold assembly flows out of the heat exchanger through the aluminum base.

[0013] Furthermore, the microchannel heat exchanger also includes a first inlet pipe, an eighth manifold assembly, and a block assembly; the multi-channel flat tubes are arranged in a serpentine pattern, folding back and forth to form a serpentine tube; the first inlet pipe is connected to the eighth manifold assembly, and the two ends of the serpentine tube are respectively inserted into the flat tube grooves of the eighth manifold assembly and the block assembly. The heat exchange medium flows into the eighth manifold assembly from the first inlet pipe, then into the serpentine tube, and then flows out of the heat exchanger through the block assembly.

[0014] Furthermore, the microchannel heat exchanger also includes a second inlet pipe, a tenth manifold assembly, an eleventh manifold assembly, and an outlet pipe; the multi-connected microchannel flat tube is serpentine, folding back and forth to form a serpentine tube; the multi-connected microchannel flat tube includes a first microchannel flat tube and a second microchannel flat tube; the second inlet pipe and the outlet pipe are connected to the upper and lower ends of the tenth manifold assembly; one end of the first microchannel flat tube and one end of the second microchannel flat tube of the serpentine tube are respectively inserted into the inlet channel flat tube groove of the tenth manifold assembly. The other end of the serpentine tube is inserted into the flat tube groove of the eleventh manifold assembly. The heat exchange medium flows into the tenth manifold assembly through the second inlet pipe. The heat exchange medium in the tenth manifold assembly flows out from the flat tube groove of the inlet pipe and flows into the eleventh manifold assembly through the first microchannel flat tube. The heat exchange medium in the eleventh manifold assembly flows into the tenth manifold assembly through the second microchannel flat tube and the flat tube groove of the outlet pipe. The heat exchange medium in the tenth manifold assembly flows out of the heat exchanger through the outlet pipe.

[0015] Compared with the prior art, the microchannel heat exchanger proposed in this utility model has at least the following beneficial effects: 1. The multi-channel flat tube heat exchanger proposed in this utility model has water guide ribs on its fins. The fins are inserted into the multi-channel flat tube heat exchanger on one side. The water guide ribs correspond to the drain hole in the middle of the multi-channel flat tube heat exchanger, which realizes accelerated drainage and solves the problems existing in plug-in fin heat exchangers. 2. The water guide ribs in the middle of the fins connect to the drainage holes of the multi-channel flat tube, creating a vertical drainage channel in the vertical direction of the fins. While realizing drainage from the left, middle and right sides of the fins, the drainage capacity of the middle drainage channel is enhanced. This not only enables the rapid discharge of condensate and reduces the thermal resistance caused by the water film on the fins, but also improves the drainage capacity of the heat exchanger, enhances the heat exchange performance, and delays the frosting of the heat exchanger. 3. This utility model is a multi-channel flat tube heat exchanger with single-insertion fins, which improves drainage performance by more than 17% compared with the interlocking fin heat exchanger. 4. When the fin slot inclination angle is 3 degrees, the heat exchanger drainage efficiency is increased by 3-5% compared with the fin opening inclination angle of 0 degrees.

[0016] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural diagram of the microchannel heat exchanger proposed in this utility model; Figure 2 for Figure 1 Another view from the opposite direction; Figure 3 This is a structural diagram of the multi-channel flat tube proposed in this utility model; Figure 4 This is a structural diagram of the fins; Figure 5 This is a partial enlarged view of the fins proposed in this utility model; Figure 6 This is a partially enlarged view of another type of fin proposed in this utility model; Figure 7 This is a structural diagram of a single-finned, single-row, multi-unit microchannel flat tube heat exchanger (with inlet and outlet on opposite sides); Figure 8 This is a structural diagram of a single-finned, single-row, multi-unit microchannel flat tube heat exchanger (with inlet and outlet on the same side); Figure 9 This is a structural diagram of a single-finned, double-row, multi-unit microchannel flat tube heat exchanger. Figure 10 This is a structural diagram of the manifold assembly; Figure 11 This is a structural diagram of a single-finned serpentine tube multi-channel flat tube heat exchanger. Figure 12 This is a structural diagram of a single-finned serpentine tube double-row multi-connection microchannel flat tube heat exchanger. Figure 13 This is a structural diagram of the manifold assembly; Figure 14 This is a structural diagram of another microchannel heat exchanger proposed in this utility model.

[0019] In the diagram: 1-Multi-channel flat tube; 101-Drain hole width; 102-Connector width; 111-First microchannel flat tube; 112-Second microchannel flat tube; 113-Connector; 114-Drain hole; 11-Serpentine tube; 2-Fin; 201-Gutter inclination angle; 202-Fin width; 203-Fin spacing; 204-Top spacing; 205-Bottom spacing; 211-First water guide rib; 212-Second water guide rib; 213-Flanged edge; 214-Flanged edge notch; 31-First manifold assembly; 32-Second manifold assembly; 33-Third manifold assembly; 34-Fourth manifold assembly; 35-Fifth manifold assembly; 36-Sixth manifold assembly; 37-Seventh manifold assembly; 38-Eighth manifold assembly; 39-Ninth manifold assembly; 311-Tenth manifold assembly; 312-Eleventh manifold assembly; 3111-First inlet; 3114-Second inlet; 3601-Square manifold plate; 3602-Square tube; 3603-Cover plate; 3112-Inlet flow channel flat tube groove; 3113-Outlet flow channel flat tube groove; 3611-First flat tube groove; 3612-Second flat tube groove; 41-First pressing block assembly; 42-Second pressing block assembly; 43-Third pressing block assembly; 44-Fourth pressing block assembly; 45-Distributor; 46-Aluminum base; 47-First liquid inlet pipe; 411-Second liquid inlet pipe; 412-Liquid outlet pipe; 48-Square block assembly; 5-Partition. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model. This utility model is intended for more general application in socket-type heating pipes; therefore, this utility model can be used in any practical application with suitable specific requirements.

[0021] Example 1 See Figure 1 , Figure 2 and Figure 12The present invention provides a microchannel heat exchanger, including a multi-channel flat tube 1, which includes a plurality of parallel microchannel flat tubes, and adjacent microchannel flat tubes are connected by a connector 113.

[0022] See Figure 12 The multi-channel flat tube 1 includes three microchannel flat tubes.

[0023] See Figure 1 The multi-channel flat tube 1 includes two microchannel flat tubes, namely a double microchannel flat tube, which are the first microchannel flat tube 111 and the second microchannel flat tube 112. The following explanation uses the double microchannel flat tube as an example.

[0024] The first microchannel flat tube 111 and the second microchannel flat tube 112 are connected by a connector 113. The first microchannel flat tube 111, the second microchannel flat tube 112 and the connector 113 form a double microchannel flat tube 1. The connector 113 is provided with a plurality of elongated drainage holes 114 at intervals in the middle. The first microchannel flat tube 111 and the second microchannel flat tube 112 are provided with a plurality of fins 2 in the length direction. Each fin 2 includes a sheet-like main plate. A plurality of slots are opened on one side of the sheet-like main plate. The plurality of slots are arranged in an array in the height direction of the sheet-like main plate and are parallel to each other. A double microchannel flat tube 1 is inserted into each slot to form a double microchannel flat tube heat exchanger with fins inserted on one side. The drainage holes 114 of the connector 113 in the plurality of layers of double microchannel flat tubes 1 are corresponding in the vertical direction.

[0025] Specifically, see Figure 1 The fin 2 is provided with two first water guiding ribs 211 and a second water guiding rib 212, see [reference]. Figure 6 Two water guide ribs are set in parallel, or see [reference needed]. Figure 5 The two water guide ribs are arranged in an inverted V-shape, and the bottom of the two water guide ribs corresponds to the drainage hole 114 of the lower connecting piece 113.

[0026] The fin 2 can be a straight fin, a corrugated fin, a windowed fin, or a combination of two of these types.

[0027] Two water guide ribs are vertically arranged in the middle of the fin. The two water guide ribs are widely spaced at the top (to collect the condensate collected from the drainage holes of the intermediate connector of the double microchannel flat tube on the upper layer of the fin and the condensate generated by the upper layer of the fin), and narrowly spaced at the bottom (to guide the condensate collected from the drainage holes of the intermediate connector of the intermediate connector of the intermediate double microchannel flat tube on the upper layer of the fin and the condensate generated by the fin on the lower layer of the fin). The water guide ribs are designed with windows on both sides, and the windows are opened in opposite directions, which is conducive to water guidance on both sides of the fin. The water guide rib in the middle of the fin connects to the drainage hole of the double microchannel flat tube, cleverly combining the fin with the water guide rib in the middle with the double microchannel flat tube with a notch. This quickly and effectively introduces the condensate from the current fin and the upper fin into the drainage hole of the double microchannel flat tube, and into the water guide rib of the lower fin. A vertical and rapid drainage channel is constructed in the vertical direction of the fin, so that the condensate formed on the upper fin can flow into the bottom of the fin in an orderly and rapid manner under the action of gravity and the water guide structure.

[0028] While enabling drainage from the left, middle, and right sides of the heat exchanger, the presence of water-guiding ribs on the fins accelerates the drainage capacity of the middle section of the heat exchanger. This structure achieves rapid and effective drainage of the heat exchanger, reduces the thermal resistance caused by condensate, improves the air-side heat transfer capacity of the heat exchanger, and delays frosting.

[0029] In some embodiments proposed in this utility model, see Figure 4 The water guide ribs have a structure with windows on both sides, and the windows are in opposite directions, which is beneficial for water guidance on both sides of the fins. The slots of the fins 2 are inclined, and the angle 201 formed with the horizontal direction is 0° to 3°. When in operation, the angle between the flat tube and the horizontal direction is 0° to 3°. The ratio of the top spacing 204 of the two water guide ribs on the fins 2 to the width of the drainage hole 101 is 100% to 120%, the ratio of the bottom spacing 205 of the two water guide ribs on the fins 2 to the width of the drainage hole 101 is 60% to 100%, and the fin width 202 is greater than or equal to 25mm.

[0030] Specifically, see Figure 3 The width of the drain hole 101 is greater than or equal to 2 mm, and the difference between the width of the connector 102 and the width of the drain hole 101 is less than or equal to 1.0 mm, with each side being less than or equal to 0.5 mm.

[0031] Specifically, see Figure 1The fin 2 has a fin flange 213 at the slot, and a fin flange notch 214 is provided at the position of the connecting member 113 corresponding to the fin flange 213. The width of the fin flange notch is 0% to 140% of the width of the drain hole 101. The heat exchanger includes multiple fins 2, and the fin spacing 203 between two adjacent fins is greater than or equal to 1.3 mm. The drainage unit, the fin flange notch, and the drain hole of the multi-channel flat tube are connected in the vertical direction, establishing a continuous drainage channel between the fins and the microchannel flat tube.

[0032] The microchannel heat exchanger proposed in this invention inserts a water-guiding fin with a drainage-accelerating fin on one side into a multi-channel flat tube with a drainage hole in the middle, thus constructing a vertical rapid drainage channel.

[0033] Example 2 See Figure 7 This utility model proposes a single-finned, single-row, multi-unit microchannel flat tube heat exchanger, including the aforementioned microchannel heat exchanger, and further including a pressure block assembly 41, a first manifold assembly 31, a second manifold assembly 32, and a second pressure block assembly 42. The pressure block assembly 41 is connected to the first manifold assembly 31. The two ends of the multi-unit microchannel flat tube 1 are respectively inserted into the flat tube grooves of the first manifold assembly 31 and the second manifold assembly 32. The second manifold assembly 32 is connected to the second pressure block assembly 42. The heat exchange medium enters the first manifold assembly 31 through the pressure block assembly 41, flows through the multi-unit microchannel flat tube 1 into the second manifold assembly 32, and flows out of the heat exchanger through the second pressure block assembly 42.

[0034] Example 3 See Figure 8 This utility model proposes a single-finned, single-row, multi-unit microchannel flat tube heat exchanger, including the aforementioned microchannel heat exchanger, and further including a pressure block assembly 43, a third manifold assembly 33, a fourth manifold assembly 34, and a pressure block assembly 44; the two ends of the multi-unit microchannel flat tube 1 are respectively inserted into the flat tube grooves of the third manifold assembly 33 and the fourth manifold assembly 34, the third manifold assembly 33 is connected to the pressure block assembly 43 and the pressure block assembly 44 respectively, the heat exchange medium enters the third manifold assembly 33 through the pressure block assembly 44, the heat exchange medium in the third manifold assembly 33 flows through the multi-unit microchannel flat tube 1 into the fourth manifold assembly 34, and the heat exchange medium in the fourth manifold assembly 34 flows out of the heat exchanger through the pressure block assembly 44.

[0035] The main difference between Example 3 and Example 2 is: Figure 4 The heat exchange medium in the multi-channel flat tube 1 enters from the first manifold assembly 31 and exits from the second manifold assembly 32, i.e., it enters and exits from opposite sides. Figure 5The heat exchange medium in the multi-channel flat tube 1 has both inlet and outlet in the third manifold assembly 33 and the fourth manifold assembly 34, that is, inlet and outlet on the same side.

[0036] Example 4 See Figure 9 This utility model proposes a single-finned double-row multi-unit microchannel flat tube heat exchanger, including the aforementioned microchannel heat exchanger, and further including a distributor 45, a fifth manifold assembly 35, a sixth manifold assembly 36, a seventh manifold assembly 37, and an aluminum base 46. The multi-unit microchannel flat tube 1 includes a first microchannel flat tube 111 and a second microchannel flat tube 112.

[0037] See Figure 10 The sixth manifold assembly 36 includes a square manifold plate 3601, a square tube 3602, and a cover plate 3603. The square manifold plate 3601 has a row of flat tube slots 3611 and a row of flat tube slots 3612. There can be only one slot or multiple slots for each flat tube slot 3611 and 3612. The square tube 3602 uses a partition to ensure that no cross-current occurs between each loop. The first microchannel flat tube 111 of the multi-connected microchannel flat tube 1 is inserted into the flat tube slot 3611, and the second microchannel flat tube 112 is inserted into the flat tube slot 3612.

[0038] See Figure 9 The distributor 45 is connected to the fifth manifold assembly 35. The fifth manifold assembly 35 and the sixth manifold assembly 36 are connected through the first microchannel flat tube 111 of the multi-channel flat tube 1. The sixth manifold assembly 36 is used to introduce the heat exchange medium in the first microchannel flat tube 111 of the multi-channel flat tube 1 into the second microchannel flat tube 112. The sixth manifold assembly 36 and the seventh manifold assembly 37 are connected through the second microchannel flat tube 112. The seventh manifold assembly 37 is connected to the aluminum base 46.

[0039] The heat exchange medium is evenly distributed by the distributor 45 into the fifth manifold assembly 35. The heat exchange medium in the fifth manifold assembly 35 flows into the sixth manifold assembly 36 through the first microchannel flat tube 111, and then flows into the seventh manifold assembly 37 through the second microchannel flat tube 112 in the multi-connected microchannel flat tube 1. The heat exchange medium in the seventh manifold assembly 37 flows out of the heat exchanger through the aluminum base 46.

[0040] Example 5 See Figure 11This utility model proposes a single-finned serpentine tube multi-unit microchannel flat tube heat exchanger, including the aforementioned microchannel heat exchanger. The microchannel heat exchanger further includes a first inlet pipe 47, an eighth manifold assembly 38, a manifold assembly 39, and a block assembly 48. The multi-unit microchannel flat tube 1 is formed by serpentine back-and-forth folding. The first inlet pipe 47 is connected to the eighth manifold assembly 38 and the manifold assembly 39 respectively. One end of each of the two serpentine tubes 11 is inserted into the flat tube grooves of the manifold 38 and the manifold 39 respectively. The serpentine tubes 11 fold back and forth in a serpentine manner and finally insert into the flat tube groove of the block assembly 48, and then flow out of the heat exchanger through the block assembly 48.

[0041] Example 6 See Figure 12 and Figure 13 This utility model proposes a single-finned serpentine tube double-row multi-connected microchannel flat tube heat exchanger, including the above-mentioned microchannel heat exchanger. The microchannel heat exchanger also includes a second liquid inlet pipe 411, a first tenth manifold assembly 311, a first eleventh manifold assembly 312 and a liquid outlet pipe 412.

[0042] The multi-channel flat tube 1 is serpentine and folds back and forth to form a serpentine tube 11, which includes a first microchannel flat tube 111 and a second microchannel flat tube 112.

[0043] The second inlet pipe 411 and the outlet pipe 412 are connected to the pipe openings 3111 and 3114 at the upper and lower ends of the first tenth manifold assembly 311. A partition 5 in the middle of the first tenth manifold assembly 311 separates the inlet channel from the outlet channel. One end of the first microchannel flat tube 111 and one end of the second microchannel flat tube 112 of the serpentine tube 11 are respectively inserted into the inlet channel flat tube groove 3112 and the outlet channel flat tube groove 3113 of the first tenth manifold assembly 311. The other end of the serpentine tube 11 is inserted into the flat tube groove of the first eleventh manifold assembly 312.

[0044] The heat exchange medium flows into the first tenth manifold assembly 311 through the second inlet pipe 411. The heat exchange medium in the first tenth manifold assembly 311 flows out from the inlet channel flat tube groove 3112 and flows into the first eleventh manifold assembly 312 via the first microchannel flat tube 111 of the serpentine tube 11. The heat exchange medium in the first eleventh manifold assembly 312 flows through the second microchannel flat tube 112 of the serpentine tube 11, passes through the outlet channel flat tube groove 3113, and enters the first tenth manifold assembly 311. The heat exchange medium in the first tenth manifold assembly 311 flows out of the heat exchanger through the outlet pipe 412.

[0045] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A microchannel heat exchanger, characterized in that: It includes a multi-channel flat tube (1), which includes several parallel microchannel flat tubes, and two adjacent microchannel flat tubes are connected by a connector (113); The connector (113) has a drainage hole (114) in the middle. The multi-channel flat tube (1) has several fins (2) arranged along its length. Each fin (2) includes a sheet-like main board with a slot on one side. The multi-channel flat tube (1) is inserted into the slot. Each fin (2) has a drainage unit with two water guide ribs. The two water guide ribs are arranged in parallel or in an inverted V-shape. The bottom of each water guide rib corresponds to the drainage hole (114) of the connector (113) below it. The slot of the fin (2) has a fin flange (213). The fin flange (213) has a fin flange notch (214) at the position corresponding to the drainage hole (114). The drainage unit, the fin flange notch (214), and the multi-channel flat tube drainage hole (114) are connected in the vertical direction, creating a continuous drainage channel between the fin (2) and the microchannel flat tube.

2. The microchannel heat exchanger according to claim 1, characterized in that: The slot of the fin (2) is inclined, and the slot inclination angle (201) is 0° to 3°.

3. The microchannel heat exchanger according to claim 2, characterized in that: The width of the drain hole (101) is greater than or equal to 2 mm, and the fin spacing (203) is greater than or equal to 1.3 mm; the difference between the width of the connector (102) and the width of the drain hole (101) is less than or equal to 1.0 mm; the width of the fin flange notch (214) is 0% to 140% of the width of the drain hole (101).

4. The microchannel heat exchanger according to claim 2, characterized in that: The ratio of the top spacing (204) of the two water guide ribs of the drainage unit to the width (101) of the drainage hole is 100-120%, the ratio of the bottom spacing (205) of the two water guide ribs on the fin (2) to the width (101) of the drainage hole is 60-100%, and the fin width (202) is greater than or equal to 25mm.

5. The microchannel heat exchanger according to claim 1, characterized in that: The number of slots on the sheet-like motherboard is several, and the several slots are arranged in an array along the height direction of the sheet-like motherboard, and the several slots are parallel to each other. Each slot is filled with a multi-channel flat tube (1), and the drain holes (114) of the connectors (113) in the multi-channel flat tubes (1) are vertically aligned.

6. The microchannel heat exchanger according to any one of claims 1-5, characterized in that: The microchannel heat exchanger also includes a first pressure block assembly (41), a first manifold assembly (31), a second manifold assembly (32), and a second pressure block assembly (42). The first pressure block assembly (41) is connected to the first manifold assembly (31). The two ends of the multi-channel flat tube (1) are respectively inserted into the flat tube grooves of the first manifold assembly (31) and the second manifold assembly (32). The second manifold assembly (32) is connected to the second pressure block assembly (42). The heat exchange medium enters the first manifold assembly (31) from the first pressure block assembly (41). The heat exchange medium in the first manifold assembly (31) flows through the multi-channel flat tube (1) into the second manifold assembly (32). The heat exchange medium in the second manifold assembly (32) flows out of the heat exchanger through the second pressure block assembly (42).

7. The microchannel heat exchanger according to any one of claims 1-5, characterized in that: The microchannel heat exchanger also includes a third pressure block assembly (43), a third manifold assembly (33), a fourth manifold assembly (34), and a fourth pressure block assembly (44). The two ends of the multi-channel flat tube (1) are inserted into the flat tube grooves of the third manifold assembly (33) and the fourth manifold assembly (34), respectively. The third manifold assembly (33) is connected to the third pressure block assembly (43) and the fourth pressure block assembly (44), respectively. The heat exchange medium enters the third manifold assembly (33) through the fourth pressure block assembly (44). The heat exchange medium in the third manifold assembly (33) flows through the multi-channel flat tube (1) into the fourth manifold assembly (34). The heat exchange medium in the fourth manifold assembly (34) flows out of the heat exchanger through the fourth pressure block assembly (44).

8. The microchannel heat exchanger according to any one of claims 1-5, characterized in that: The microchannel heat exchanger also includes a distributor (45), a fifth manifold assembly (35), a sixth manifold assembly (36), a seventh manifold assembly (37), and an aluminum base (46); the multi-channel flat tube (1) includes a first microchannel flat tube (111) and a second microchannel flat tube (112). The heat exchange medium is evenly distributed by the distributor (45) into the fifth manifold assembly (35). The heat exchange medium in the fifth manifold assembly (35) flows into the sixth manifold assembly (36) through the first microchannel flat tube (111), and then flows into the seventh manifold assembly (37) through the second microchannel flat tube (112) in the multi-connected microchannel flat tube (1). The heat exchange medium in the seventh manifold assembly (37) flows out of the heat exchanger through the aluminum base (46).

9. The microchannel heat exchanger according to any one of claims 1-5, characterized in that: The microchannel heat exchanger also includes a first inlet pipe (47), an eighth manifold assembly (38), and a block assembly (48); the multi-channel flat tube (1) is serpentine and folds back and forth to form a serpentine tube (11). The first inlet pipe (47) is connected to the eighth manifold assembly (38). The two ends of the serpentine tube (11) are inserted into the flat tube grooves of the eighth manifold assembly (38) and the block assembly (48), respectively. The heat exchange medium flows into the eighth manifold assembly (38) from the first inlet pipe (47), then into the serpentine tube (11), and then flows out of the heat exchanger through the block assembly (48).

10. The microchannel heat exchanger according to any one of claims 1-5, characterized in that: The microchannel heat exchanger also includes a second inlet pipe (411), a tenth manifold assembly (311), an eleventh manifold assembly (312), and an outlet pipe (412). The multi-channel flat tube (1) is serpentine and folds back and forth to form a serpentine tube (11); the serpentine tube (11) includes a first microchannel flat tube (111) and a second microchannel flat tube (112); The second inlet pipe (411) and the outlet pipe (412) are respectively connected to the pipe openings at the upper and lower ends of the tenth manifold assembly (311); one end of the first microchannel flat tube (111) and one end of the second microchannel flat tube (112) of the serpentine tube (11) are respectively inserted into the inlet flow channel flat tube groove (3112) and the outlet flow channel flat tube groove (3113) of the tenth manifold assembly (311), and the other end of the serpentine tube (11) is inserted into the flat tube groove of the eleventh manifold assembly (312); The heat exchange medium flows into the tenth manifold assembly (311) through the second inlet pipe (411). The heat exchange medium in the tenth manifold assembly (311) flows out from the inlet channel flat tube groove (3112) and flows into the eleventh manifold assembly (312) through the first microchannel flat tube (111). The heat exchange medium in the eleventh manifold assembly (312) flows through the second microchannel flat tube (112) and enters the tenth manifold assembly (311) through the outlet channel flat tube groove (3113). The heat exchange medium in the tenth manifold assembly (311) flows out of the heat exchanger through the outlet pipe (412).

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