Flow channel structure of micro-channel heat exchanger and production method thereof

Abstract

This invention discloses a flow channel structure and manufacturing method of a microchannel heat exchanger, comprising a shell, a cover, and a plurality of microchannel tubes. The cover includes a liner, which is welded and fixed to the end of the shell. The liner has through holes that are adapted to and correspond one-to-one with the microchannel tubes. The microchannel tubes are disposed inside the shell, and a coolant channel is formed between the outside of the microchannel tubes and the inner cavity of the shell. The end of the microchannel tube extends out of the shell through the through hole, and the outer periphery of the microchannel tube is welded and fixed to the through hole to achieve a seal. The inside of the microchannel tube serves as a channel for the oil to be cooled. This invention is applicable to the heat dissipation requirements of new energy vehicle platforms.

Description

Technical Field

[0001] This invention relates to heat exchangers, and more specifically, to a flow channel structure for a microchannel heat exchanger, a microchannel heat exchanger, and a method for manufacturing a microchannel heat exchanger. Background Technology

[0002] In the thermal management system of new energy vehicles, small oil coolers mostly adopt plate heat exchangers, which can effectively cool and reduce the temperature of various key components of the vehicle. For some high-end new energy vehicles, their active suspension systems can actively adjust the suspension operation through hydraulic control mechanisms, thereby significantly improving the vehicle's driving comfort. For these high-end models, the plate heat exchangers used in them need to operate in a high oil pressure environment for a long time, with an operating oil pressure of approximately 120-150 bar, requiring the heat exchange plates to have a pressure resistance of 300 bar. Currently, conventional aluminum plate heat exchanger structures, with their multi-layered structure, can form multiple flow channels inside, achieving heat exchange, but their strength cannot meet the requirements of this high-pressure operation.

[0003] To meet strength and performance requirements, some manufacturers in the industry typically use stainless steel plate heat exchangers. However, stainless steel plate heat exchangers have two major drawbacks that are difficult to overcome: First, their lightweight adaptability is insufficient, as stainless steel has a higher density than aluminum, leading to an increase in the overall weight of the heat exchanger; second, there is a risk of electrochemical corrosion. During the welding process of stainless steel heat exchangers, copper material is pre-installed between adjacent stainless steel heat exchange plates as a solder. After the copper sheets melt during welding, copper impurities remain in the heat exchange channels between the plates. When the heat exchange water circulates in the channels, it reacts chemically with the residual copper material, introducing copper ions into the water. Since conventional automotive connecting pipes are mostly made of aluminum, the potential difference between aluminum and copper ions in the water easily triggers an electrochemical reaction, causing the aluminum pipes to corrode and break, ultimately affecting the normal operation of the equipment.

[0004] Therefore, a new heat exchanger solution is needed to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a flow channel structure for a microchannel heat exchanger and its manufacturing method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A flow channel structure for a microchannel heat exchanger includes a shell, a cover, and a plurality of microchannel tubes. The cover includes a liner, which is welded and fixed to the end of the shell. The liner has through holes that are adapted to and correspond one-to-one with the microchannel tubes. The microchannel tubes are disposed inside the shell, and a coolant channel is formed between the outside of the microchannel tubes and the inner cavity of the shell. The ends of the microchannel tubes extend through the through holes to the outside of the shell, and the outer periphery of the microchannel tubes is welded and fixed to the through holes to achieve a seal. The inside of the microchannel tubes serves as a channel for the oil to be cooled.

[0008] The present invention is further configured such that the cross-section of the microchannel tube is an elongated waist-shaped structure, and the cross-section of the through hole is an elongated waist-shaped structure adapted to the microchannel tube.

[0009] The present invention is further configured such that two heat exchange interfaces are provided on the outside of the housing.

[0010] The present invention is further configured such that the cover body also includes a cover body seat, the cover body seat is located on the side of the liner plate facing away from the shell, the cover body seat and the liner plate are overlapped and welded together and fixed, and an inner flow channel is formed between the cover body seat and the liner plate; the microchannel tube is connected to the inner flow channel through a through hole;

[0011] The present invention is further configured such that two covers are provided, and the two covers are respectively located at both ends of the shell; both covers are provided with heat exchange interface two.

[0012] The present invention is further configured such that the thickness of the microchannel tube is adapted to the through hole, and the two side planes of the microchannel tube are in contact with the inner wall of the through hole.

[0013] The present invention is further configured such that the width of the microchannel tube is greater than the width of the through hole, the microchannel tube is inserted into the through hole, and a gap is formed between the microchannel tube and the through hole in the length direction.

[0014] The present invention is further configured such that the width of the gap is less than 0.2 mm; the outer periphery of the microchannel tube and the inner periphery of the through hole are welded and fixed to each other to achieve a seal.

[0015] The present invention is further configured such that the microchannel tube is inserted into the through hole and is inclined, and the through holes of the two liner plates at both ends of the microchannel tube are misaligned with each other, with the misalignment direction along the width direction of the microchannel tube.

[0016] The present invention also provides a microchannel heat exchanger, including the flow channel structure of the microchannel heat exchanger as described above, forming a heat exchanger with microchannel tubes inside.

[0017] The present invention also provides a method for producing a microchannel heat exchanger, which is used to produce the microchannel heat exchanger as described above; the various components of the heat exchanger are clamped and fixed by tooling, and then placed in a furnace. Through high temperature heating, the welding material at the contact position of the various components of the heat exchanger melts, and after welding, an integral structure can be formed.

[0018] In summary, the present invention has the following beneficial effects:

[0019] In this design, all components of the heat exchanger's flow channel structure are made of aluminum. Liners are installed at both ends of the shell, and microchannel tubes are installed inside the shell, with both ends of the microchannel tubes penetrating the linerers and extending to the outside of the shell. A coolant flow channel is formed between the shell and the microchannel tubes, while a high-temperature, high-pressure oil flow channel is formed inside the microchannel tubes. The multiple flow channels within the microchannel tubes can withstand the high-temperature, high-pressure oil flow, thus meeting the pressure requirements of the vehicle-mounted heat exchanger. The high-pressure oil inside the microchannel tubes will not affect the shell, maintaining the overall structural stability of the shell. This not only meets the pressure-bearing performance requirements of the entire heat exchanger, but the multi-channel structure of the microchannel tubes also increases the heat exchange area, thereby improving the overall heat exchange efficiency.

[0020] Furthermore, the offset of the through holes in the two backing plates ensures that, when the microchannel tube is tilted, the edge of the microchannel tube precisely abuts against the edge of the through hole on the narrow side of the gap. With the outer edge of the microchannel tube in contact with the edge of the through hole on the narrow side, a welding base is easily formed at this contact point during welding, making it easier to weld and fix the gap between the two. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the flow channel structure of a microchannel heat exchanger according to Embodiment 1;

[0022] Figure 2 This is a schematic diagram of the first decomposition state structure of Example 1;

[0023] Figure 3 This is a schematic diagram of the first cross-sectional structure of Embodiment 1;

[0024] Figure 4 middle Figure 3 Sectional view at point AA;

[0025] Figure 5 middle Figure 4 Sectional view at point BB;

[0026] Figure 6 This is a schematic diagram of the second decomposition state structure of Example 1;

[0027] Figure 7 This is a schematic diagram of the second cross-sectional structure of Embodiment 1;

[0028] Figure 8 for Figure 7 Enlarged view of point A in the middle;

[0029] Figure 9 This is a schematic diagram of the structure of the microchannel tube in contact with the limiting step surface in Embodiment 2;

[0030] Figure 10 This is a schematic diagram of the through-hole and microchannel tube structure in Example 3;

[0031] Figure 11 This is a schematic diagram of the disassembled structure of the through hole and microchannel tube in Example 3;

[0032] Figure 12 This is a cross-sectional view of the two liners and the microtube channel in Example 3;

[0033] Figure 13 This is a schematic diagram of the structure of the two liner plates in Example 3;

[0034] Figure 14 This is a schematic diagram of the inclined insertion of the liner and microchannel in Example 3.

[0035] Reference numerals: Shell 1; Heat exchange interface 101; Protrusion 102; Connecting groove 103; Cover 2; First cover 2001; Second cover 2002; Heat exchange interface 201; Cover seat 21; Inner flow channel 211; Limiting ring 212; Limiting step 213; Two clearance grooves 214; Liner 22; Through hole 221; Microchannel tube 3; Microchannel tube group 31; Partition 4; Flow port 41; Heat conducting plate 5; Gap 6; Narrow side 61; Wide side 62. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1

[0038] This embodiment discloses a flow channel structure for a microchannel heat exchanger. The entire heat exchanger is made of aluminum. (Refer to...) Figures 1-8 As shown, it includes a shell 1, two covers 2 and several microchannel tubes 3. The two covers 2 are respectively covered at both ends of the shell 1, and an internal flow channel 211 is pre-processed inside the cover 2.

[0039] The microchannel tube 3 is a flat aluminum tube with several parallel micropore channels inside. The microchannel tube 3 is arranged along the length of the shell 1. Both ends of the microchannel tube 3 are connected to two covers 2 and can communicate with the inner channels 211 inside the covers 2.

[0040] Each cover 2 is provided with a heat exchange interface 201. The heat exchange interface 201, inner flow channel 211, and microchannel tube 3 on one side of the cover 2, and the inner flow channel 211 and heat exchange interface 201 on the other side of the cover 2 are connected in sequence to form a cooling flow channel for high temperature and high pressure hydraulic oil.

[0041] Two heat exchange ports 101 are provided on the outside of the shell 1. The low-temperature medium for cooling flows in from one of the heat exchange ports 101, enters the interior of the shell 1, exchanges heat with each of the microchannel tubes 3, and then flows out from the other heat exchange port 101, forming a coolant flow channel.

[0042] In order to improve the flow of the low-temperature medium used for cooling within the shell 1 and ensure effective heat exchange, the flow channel structure within the shell 1 can be designed.

[0043] Reference Figures 2-6 As shown, the microchannel tube 3 is divided into two groups of microchannel tubes 31, one on the left and one on the right. Several microchannel tubes 3 are stacked to form a microchannel tube group 31. A heat-conducting plate 5 is provided between adjacent microchannel tubes 3. The heat-conducting plate 5 is connected to the outer surface of the microchannel tube 3, which can increase the heat exchange area of ​​the outer surface of the microchannel tube 3 and thus improve the heat exchange efficiency.

[0044] In this embodiment, the cover 2 includes a cover base 21 and a liner 22. A plurality of through holes 221 are provided in the liner 22. The through holes 221 are adapted to and correspond one-to-one with the microchannel tube 3. The microchannel tube 3 can be inserted into the through hole 221.

[0045] Reference Figure 6 As shown, the liner 22 is placed on the end of the housing 1, and is cut to cover the opening at the end of the housing 1. The end of the microchannel tube 3 extends through the through hole 221 and communicates with the inner flow channel 211 of the cover 2.

[0046] The cover seat 21 is located on the side of the liner 22 facing away from the shell 1. The side of the cover seat 21 facing the liner 22 forms an inner flow channel 211. The liner 22 can cover the inner flow channel 211, thereby forming a corresponding inner flow channel 211 structure inside the cover 2. The inner flow channel 211 is interconnected with the heat exchange interface 201, enabling oil to enter and exit.

[0047] In this embodiment, the various components that need to be connected and fixed are all connected by welding, thereby maintaining the airtightness of the connection and ensuring that the entire heat exchanger forms a monolithic structure after processing. Specifically, furnace welding can be used, where a weld layer is pre-formed at the contact points of each component. Under high temperature, the weld layer melts, thereby welding the necessary connection points to form a welded, sealed, and fixed structure.

[0048] The cover seat 21, the liner 22, and the shell 1 are stacked in sequence and fixed together by welding to form an integral structure. The microchannel tube 3 extends into the corresponding through hole 221, and is sealed and fixed between the outer periphery of the microchannel tube 3 and the inner wall of the through hole 221 by welding.

[0049] Reference Figure 7 , Figure 8 As shown, the end of the microchannel tube 3 extends into the inner flow channel 211 of the cover seat 21. A limiting step surface 213 is formed in the inner flow channel 211 facing the microchannel tube 3. The limiting step surface 213 can block and limit the end of the microchannel tube 3.

[0050] Reference Figure 8 As shown, the length of the microchannel tube 3 is less than the distance between the two limiting steps 213 of the two housings 1, and greater than the thickness of the two liner plates 22. There is a movable space between the two limiting steps 213 for the microchannel tube 3. When the first end of the microchannel tube 3 abuts against the limiting step 213 on one side, the second end of the microchannel tube 3 remains in the inner flow channel 211 on the corresponding side, thereby ensuring that the microchannel tube 3 can always connect the inner flow channels 211 on both sides.

[0051] Reference Figure 9 As shown, the length of the microchannel tube 3 must be exactly equal to the distance between the two limiting step surfaces 213 of the two housings 1. During installation, the two ends of the microchannel tube 3 are respectively pressed against the limiting step surfaces 213 in the two housings 1 for positioning. This ensures the positional stability of the microchannel tube 3 after installation, prevents the microchannel tube 3 from shifting during assembly, and ensures the positional accuracy of the microchannel tube 3.

[0052] Furthermore, a clearance groove 214 is provided on the limiting step surface 213, which can communicate with the inner flow channel 211, thereby enabling the inner flow channel 211 to achieve smooth flow.

[0053] In addition, to improve the installation accuracy of the entire heat exchanger and enhance its pressure-bearing strength after fixed welding, an annular limiting ring 212 can be integrally formed on the side of the cover seat 21 facing the shell 1. The inner circumference of the limiting ring 212 is adapted to the liner 22. When the liner 22 and the cover seat 21 are assembled together, the liner 22 can be precisely embedded in the inner circumference of the limiting ring 212, and the limiting ring 212 can block and limit the outer circumference of the liner 22, providing greater lateral support force.

[0054] Reference Figures 3-6 As shown, in this embodiment, a partition 4 is provided between the two sets of microchannel tubes 31, and the upper and lower sides of the partition 4 are respectively sealed and fixedly connected to the inner wall of the shell 1. The partition 4 is sealed and fixedly connected to the first cover 2001, and is separated from the second cover 2002 to form a flow port 41. Two heat exchange ports 101 are provided on the side of the shell 1 near the first cover 2001, and the two heat exchange ports 101 are respectively located on both sides of the partition 4.

[0055] In addition, to improve the smooth flow of the heat exchange medium between the microchannel tubes 3, a protrusion 102 can be formed on the side of the shell 1, and a connecting groove 103 can be formed on the inner side of the protrusion 102. The connecting groove 103 is arranged along the stacking direction of the microchannel tube group 31 and extends to the heat exchange interface 101, so that the space between the microchannel tubes 3 can communicate with the connecting groove 103. The connecting groove 103 can serve as a flow convergence space between the heat exchange interface 101 and the microchannel tubes 3, so that the heat exchange medium can smoothly form a flow distribution and convergence between the microchannel tubes 3, improve the flow efficiency and heat exchange efficiency of the heat exchange medium, and ensure that each microchannel tube 3 can achieve relatively uniform heat dissipation.

[0056] During the flow of the medium through the shell 1, it first enters the shell 1 through the heat exchange port 101 on one side. The heat exchange medium can be diverted to the space between each layer of microchannel tubes 3 along the connecting groove 103, and then flow along the length of the microchannel tubes 3 to the flow port 41. After passing through the flow port 41, the heat exchange medium will flow to the other side of the partition 4, enter between another group of microchannel tubes 31, and then flow back from the connecting groove 103 to the heat exchange port 101 on that side. The heat exchange medium is then output from the heat exchange port 101 to achieve complete flow of the heat exchange medium.

[0057] This embodiment also discloses a microchannel heat exchanger, including the flow channel structure of the microchannel heat exchanger as described above; in this heat exchanger, high-temperature and high-pressure oil is transported through the microchannel tube, and the microchannel tube has good pressure-bearing performance, thereby improving the pressure-bearing performance of the entire heat exchanger.

[0058] This embodiment also discloses a method for producing a microchannel heat exchanger, used to produce the microchannel heat exchanger in the above embodiment; the various components of the heat exchanger are clamped and fixed by tooling, and then placed in a furnace. Through high-temperature heating, the welding material at the contact position of the various components of the heat exchanger melts, thereby achieving welding and fixing of the contact position of the components. After welding, an integral structure can be formed.

[0059] Example 2

[0060] This embodiment discloses a flow channel structure for a microchannel heat exchanger, based on Embodiment 1, and with reference to... Figure 9 In detail, the outer periphery of the housing 1 is also adapted to the inner periphery of the limiting ring sleeve 212; during assembly, the housing 1 can also be embedded in the inner periphery of the limiting ring sleeve 212, thereby forming direct contact between the outer periphery of the housing 1 and the inner periphery of the limiting ring sleeve 212 of the cover seat 21. During welding and fixing, the two can be directly welded and fixed, thereby further improving the strength and sealing performance of the connection position.

[0061] Example 3

[0062] This embodiment discloses a microchannel heat exchanger, which is based on Embodiment 1 and further refers to... Figures 10-14 Please provide a detailed explanation.

[0063] Reference Figure 10 , Figure 11 As shown, in this embodiment, the microchannel tube 3 has a long waist-shaped cross-section, with parallel structures on both sides in the middle section and semi-circular structures on both sides; the thickness of the microchannel tube 3 is h1, and the width is a1. Correspondingly, the through hole 221 of the liner 22 also has a long waist-shaped structure, and similarly, its middle section also has parallel structures on both sides and semi-circular structures on both sides; the thickness of the through hole 221 is h2, and the width is a2.

[0064] Regarding the dimensions of the microchannel tube 3 and the through hole 221, their thicknesses are the same, i.e., h1=h2; the width of the through hole 221 is slightly larger than the width of the microchannel tube 3, and a2-a1=b1, with the size of b1 being approximately 0.1-0.2mm.

[0065] During installation, to facilitate the insertion of the microchannel tube 3 into the through hole 221, the cross-sectional profile of the microchannel tube 3 can be set to fit the through hole 221. That is, the width direction of the microchannel tube 3 matches the internal width of the through hole 221, allowing for smooth insertion; and the width direction of the through hole 221 is slightly larger than that of the microchannel tube 3. The through hole 221 is formed by milling during the processing, creating a certain process allowance in the width direction, thus enabling the microchannel tube 3 to be inserted smoothly.

[0066] Reference Figure 12 , Figure 13 As shown, after the microchannel tube 3 is inserted into the through hole 221 of the liner 22, it is tilted and can produce a small angle of displacement within the gap 6.

[0067] To accommodate the tilted state of the microchannel tube 3, the through holes 221 of the two end plates 22 of the microchannel tube 3 are staggered, and the direction of the stagger is along the width direction of the microchannel tube 3. (Refer to...) Figure 13 As shown, the distance between the two liner plates 22 is L, and the offset of the through hole 221 of the two liner plates 22 is k.

[0068] The microchannel tube 3 is inserted into the through-hole 221 at an angle, which will create an inclined structure between the microchannel tube 3 and the gap 6 on the side of the through-hole 221, as shown in the figure. Figure 14 As shown, the gap 6 along the length of the microchannel tube 3 forms a structure with one side being larger than the other, i.e., forming a narrow side 61 and a wide side 62. Moreover, the inclined microchannel tube 3 can distribute the gap 6 relatively evenly to both sides of the microchannel tube 3, thereby reducing the gap on one side.

[0069] Furthermore, because the microchannel tube 3 is tilted, the volume of the microchannel tube 3 passing through the through hole 221 will increase slightly, meaning that the space in the gap 6 on both sides of the microchannel tube 3 will be compressed. With a smaller gap between the microchannel tube 3 and the through hole 221, the weld layer will more easily fill the space in the gap 6 after melting, making it easier to achieve a weld seal at the connection between the microchannel tube 3 and the through hole 221.

[0070] Reference Figure 14 As shown, for example, on the wide side 62 of the gap 6, the gap on the wide side 62 is b2, and the width of the gap b2 is the difference between the width a2 and b3 of the through hole 221; moreover, since the microchannel tube 3 is in an inclined state, b3>a1, so the gap b2 on the wide side 62 is smaller than the original gap width b1, and thus the overall gap 6 space between the microchannel tube 3 and the through hole 221 will be smaller, which is more conducive to the molten welding material to weld and fix the connection and maintain a sealed state.

[0071] Furthermore, the offset k of the through holes 221 of the two liner plates 22 and the thickness c of the liner plates 22 are designed so that when the microchannel tube 3 is tilted, at the narrow side 61 of the gap 6, the edge of the microchannel tube 3 can just abut against the edge of the through hole 221 of the narrow side 61. (Refer to...) Figure 14 In the state where the outer edge of the microchannel tube 3 is in contact with the edge of the through hole 221 on the narrow side 61, a welding support base is easily formed at this contact position during the welding process, making it easier to weld and fix the gap 6 between the two together.

[0072] Moreover, referencing Figure 12 , Figure 14 As shown, at both ends of the microchannel tube 3, the microchannel tube 3 can simultaneously abut against the edge of the through hole 221 on the narrow side 61, thereby stably maintaining the angle state of the microchannel tube 3, and thus maintaining the stability and accuracy of the initial installation position of the microchannel tube 3.

[0073] Reference Figure 13 As shown, the tilt angle of the microchannel tube 3 is α, and tan(α) = k / L = b² / c. The parameters of each dimension can be obtained through calculation, and thus the offset k of the through holes 221 of the two liner plates 22 can be obtained. In the actual processing, a margin calculation is performed on the offset k. The actual offset k1 is 0.8k-0.9k, which serves both as an adjustment and ensures smooth assembly.

[0074] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A flow channel structure for a microchannel heat exchanger, characterized in that, The device includes a shell (1), a cover (2), and several microchannel tubes (3). The cover (2) includes a liner (22), which is welded and fixed to the end of the shell (1). The liner (22) has through holes (221) that are adapted to and correspond one-to-one with the microchannel tubes (3). The microchannel tubes (3) are located inside the shell (1), and a coolant channel is formed between the outside of the microchannel tubes (3) and the inner cavity of the shell (1). The end of the microchannel tubes (3) extends out of the shell (1) through the through holes (221), and the outer periphery of the microchannel tubes (3) is fixed to the through holes (221) by welding and sealed. The inside of the microchannel tubes (3) serves as a channel for the oil to be cooled.

2. The flow channel structure of a microchannel heat exchanger according to claim 1, characterized in that, The cross-section of the microchannel tube (3) is an elongated waist-shaped structure, and the cross-section of the through hole (221) is an elongated waist-shaped structure adapted to the microchannel tube (3).

3. The flow channel structure of a microchannel heat exchanger according to claim 1, characterized in that, Two heat exchange ports (101) are provided on the outside of the housing (1).

4. The flow channel structure of a microchannel heat exchanger according to claim 3, characterized in that, The cover (2) also includes a cover seat (21), which is located on the side of the liner (22) facing away from the shell (1). The cover seat (21) and the liner (22) are overlapped and welded together, and an inner flow channel (211) is formed between the cover seat (21) and the liner (22). The microchannel tube (3) is connected to the inner flow channel (211) through the through hole (221). Two covers (2) are provided, and the two covers (2) are located at both ends of the shell (1); both covers (2) are provided with heat exchange interface 2 (201).

5. The flow channel structure of a microchannel heat exchanger according to claim 1, characterized in that, The thickness of the microchannel tube (3) is adapted to the through hole (221), and the two side planes of the microchannel tube (3) are in contact with the inner wall of the through hole (221).

6. The flow channel structure of a microchannel heat exchanger according to claim 5, characterized in that, The width of the microchannel tube (3) is greater than the width of the through hole (221). The microchannel tube (3) is inserted into the through hole (221), and a gap (6) is formed between the microchannel tube (3) and the through hole (221) in the length direction.

7. The flow channel structure of a microchannel heat exchanger according to claim 6, characterized in that, The width of the gap (6) is less than 0.2 mm; the outer periphery of the microchannel tube (3) is welded and fixed to the inner periphery of the through hole (221) to achieve a seal.

8. The flow channel structure of a microchannel heat exchanger according to claim 6, characterized in that, The microchannel tube (3) is inserted into the through hole (221) and is inclined. The through holes (221) of the two liner plates (22) at both ends of the microchannel tube (3) are misaligned with each other, and the misalignment direction is along the width direction of the microchannel tube (3).

9. A microchannel heat exchanger, characterized in that, Includes the flow channel structure of the microchannel heat exchanger as described in any one of claims 1-8.

10. A method for producing a microchannel heat exchanger, characterized in that, Used to produce the microchannel heat exchanger as described in claim 9; the various components of the heat exchanger are clamped and fixed by tooling, and then placed in a furnace. Through high-temperature heating, the welding material at the contact points of the various components of the heat exchanger melts, and after welding, an integral structure can be formed.

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