Micro-channel heat exchanger with high heat exchange and low flow resistance

Abstract

The invention discloses a micro-channel heat exchanger with high heat exchange and low flow resistance. The micro-channel heat exchanger comprises a shell, a three-period extremely-small curved surface heat exchange core body, an inlet collector assembly, an outlet collector assembly, a heat exchange enhancing baffle plate and a flow dividing partition plate. The three-period minimal curved surface heat exchange core body is arranged in the shell; a flow dividing partition plate is arranged at the position of the central axis of the three-period extremely-small-curved-surface heat exchange core body, and the three-period extremely-small-curved-surface heat exchange core body is divided into a left independent part and a right independent part through the flow dividing partition plate. The enhanced heat exchange baffle plates are arranged in the centers of the left part and the right part of the three-period extremely-small curved surface heat exchange core body so as to change the flowing path of cold fluid; the two inlet collector assemblies and the two outlet collector assemblies are arranged on the left side and the right side of the shell in the radial direction and communicate with the three-period extremely-small-curved-surface heat exchange core. According to the heat exchanger, the problems of weld joint failure and the like possibly existing in a spiral tube type heat exchanger are avoided while the design requirements of high heat exchange amount, low volume weight and low gas flow resistance of the heat exchanger are met.

Description

Technical Field

[0001] The present invention belongs to the field of aerospace technology, and in particular relates to a high heat exchange and low flow resistance microchannel heat exchanger. Background Art

[0002] In liquid rocket engine systems, in order to pressurize the propellant in the tank and keep it at a certain working pressure, high-temperature gas is often used to flow through the heat exchanger to heat the low-temperature medium. The heat exchanger usually adopts a spiral tube structure. In order to achieve the heat exchange power required by the system, the spiral tube has a high tube length. However, due to space limitations, only a multi-layer spiral tube layout can be used, which greatly increases the complexity and overall weight of the structure. In addition, the multiple welds in the heat exchanger must not only withstand the scouring of the gas, but also resist the harsh vibration load of the engine, which greatly reduces the reliability of the engine system. Therefore, it is urgent to design a heat exchanger with strong heat exchange capacity, small size and weight, and high reliability.

[0003] The key to heat exchangers is to have high heat transfer capacity and small size and weight. Common compact heat exchangers include plate type, plate-fin type and printed circuit board type. The first two are limited to low temperature and low pressure application environments, while the latter, due to processing problems, often makes the heat exchanger heavier and more expensive. Summary of the invention

[0004] The technology of the present invention solves the problem: overcomes the shortcomings of the prior art and provides a high heat exchange and low flow resistance microchannel heat exchanger, which meets the design requirements of high heat exchange, low volume and weight, and low gas flow resistance of the heat exchanger, while avoiding problems such as weld failure that may exist in the spiral tube heat exchanger.

[0005] In order to solve the above technical problems, the present invention discloses a high heat exchange and low flow resistance microchannel heat exchanger, comprising: a shell, a three-period minimal curved surface heat exchange core, an inlet collector assembly, an outlet collector assembly, an enhanced heat exchange baffle and a diversion baffle;

[0006] The three-period minimal curved surface heat exchange core is arranged inside the shell;

[0007] A flow divider is provided at the central axis of the three-period minimal curved surface heat exchange core; wherein the three-period minimal curved surface heat exchange core is divided into two independent left and right parts by the flow divider, presenting a parallel structure;

[0008] The enhanced heat exchange baffle is arranged in the center of the left and right parts of the three-period minimal curved surface heat exchange core; the cold fluid channel of the enhanced heat exchange baffle is blocked and the hot fluid channel of the enhanced heat exchange baffle is opened, so that the enhanced heat exchange baffle is embedded in the three-period minimal curved surface heat exchange core; blocked by the enhanced heat exchange baffle, the cold fluid flows in the three-period minimal curved surface heat exchange core in a "X"-shaped trajectory;

[0009] There are two inlet collector assemblies and two outlet collector assemblies; among them, the first inlet collector assembly and the first outlet collector assembly are radially arranged on one side of the shell, and are connected to the left part of the three-period minimal surface heat exchange core; the second inlet collector assembly and the second outlet collector assembly are radially arranged on the other side of the shell, and are connected to the right part of the three-period minimal surface heat exchange core.

[0010] In the above-mentioned high heat transfer and low flow resistance microchannel heat exchanger, the three-period minimal surface heat exchange core has an overall square structure, which includes multiple interconnected three-period minimal surface cells; wherein the multiple three-period minimal surface cells are connected in an array in three directions of the Cartesian coordinate system, and divide the space into unconnected cold fluid domains and hot fluid domains.

[0011] In the above-mentioned high heat transfer and low flow resistance microchannel heat exchanger, the inlet collector assembly includes: an inlet collector flange, an inlet collector, a rectifier plate, a diverter column and an inlet reducer pipe; wherein, after the low-temperature medium enters the inlet reducer pipe from the inlet collector flange, it first flows through the diverter column of the triangular prism configuration to achieve preliminary diversion, and then enters the inlet collector, and then enters the three-period minimal surface heat exchange core after passing through the rectifier plate.

[0012] In the above-mentioned high heat exchange and low flow resistance microchannel heat exchanger, a plurality of rectifying holes are evenly arranged on the rectifying plate for secondary flow equalization of the low-temperature medium; wherein the total area of ​​the plurality of rectifying holes is larger than the inlet area of ​​the inlet collector assembly.

[0013] In the above-mentioned high heat exchange and low flow resistance microchannel heat exchanger, the outlet collector assembly includes: an outlet collector flange, an outlet reducing pipe and an outlet collector; wherein, after sufficient heat exchange, the low-temperature medium is gathered from the cold fluid domain of the three-period minimal surface heat exchange core to the outlet collector, and flows out from the outlet collector flange after passing through the outlet reducing pipe.

[0014] In the above-mentioned high heat transfer and low flow resistance microchannel heat exchanger,

[0015] The inlet collector assembly is self-supporting and formed: the cross section of the inlet variable diameter pipeline transitions from a circle to an ellipse along the flow direction of the low-temperature medium; the cross section of the inlet collector is a fan-shaped structure, and the inclination angle of each point of the arc is greater than 45°;

[0016] The outlet collector assembly is self-supportingly formed: the cross section of the outlet reducer pipe transitions from elliptical to circular along the flow direction of the low-temperature medium; the cross section of the outlet collector is fan-shaped, and the inclination angle of each point of the arc is greater than 45°.

[0017] In the above-mentioned high heat exchange and low flow resistance microchannel heat exchanger, a shell inlet flange is arranged at the large end of the shell, and a shell outlet flange is arranged at the small end.

[0018] In the above-mentioned high heat exchange and low flow resistance microchannel heat exchanger, the heat exchanger as a whole adopts a double-inlet and double-outlet parallel structure. When working: the low-temperature medium enters the inlet collector from the inlet collector flanges on both sides of the shell, flows through the rectifier plate and evenly enters the cold fluid domain of the three-period minimal surface heat exchange core; at the same time, the high-temperature gas enters the hot fluid domain of the three-period minimal surface heat exchange core from the shell inlet flange; after the low-temperature medium in the cold fluid domain and the high-temperature gas in the hot fluid domain are fully exchanged with each other, the low-temperature medium converges to the outlet collectors on both sides, flows out through the outlet collector flange, and is discharged from the high-temperature gas shell outlet flange.

[0019] The above-mentioned high heat exchange and low flow resistance microchannel heat exchanger also includes: a plurality of semi-elliptical powder leakage holes; the powder leakage holes are arranged close to the edge of the outlet collector assembly, including: internal powder leakage holes and external powder leakage holes; wherein the internal powder leakage holes are used to transfer the powder in the internal trapezoidal support area to the external trapezoidal support area; the external powder leakage holes are used to discharge the powder in the external trapezoidal support area to the outside of the shell.

[0020] In the above-mentioned high heat transfer and low flow resistance microchannel heat exchanger, the heat exchanger is integrally printed using additive manufacturing technology; wherein the printing material is stainless steel powder or titanium alloy powder.

[0021] The present invention has the following advantages:

[0022] (1) The present invention discloses a high heat transfer and low flow resistance microchannel heat exchanger, which uses a three-period minimal surface cell to divide the entire three-dimensional space into two unconnected channels, greatly improving the surface-to-body ratio and increasing the contact area between the cold and hot fluids. During the heat exchange process, the three-period minimal surface cell causes the flow direction of the fluid to be continuously changed, and the flow state also changes, which can not only effectively improve the heat transfer, but also impact the dirt and particles attached to the heat exchange surface, thereby increasing its service life.

[0023] (2) The present invention discloses a high heat transfer and low flow resistance microchannel heat exchanger, which adopts a double-inlet and double-outlet parallel structure. An enhanced heat transfer baffle is installed between the left and right parts of the three-period minimal curved surface heat exchange core, which can block the cold medium with the superheated medium. This structural design not only makes full use of the cavity space of the shell, increases the heat transfer flow rate of the cold fluid, and makes the entire heat exchanger structure more compact, but also can significantly increase the flow path of the low-temperature medium, reduce the flow dead zone, and effectively improve the heat transfer capacity of the heat exchanger.

[0024] (3) The present invention discloses a microchannel heat exchanger with high heat transfer and low flow resistance. The three-period minimal surface is controlled by an implicit function. The spatial proportion of the cold fluid domain and the hot fluid domain can be adjusted through parametric design, thereby forming an offset of the three-period minimal surface heat exchange core, effectively reducing the flow resistance of high-temperature fuel gas, and realizing the "high heat transfer" and "low flow resistance" of the microchannel heat exchanger.

[0025] (4) The present invention discloses a high heat transfer and low flow resistance microchannel heat exchanger. Not only can the three-period minimal curved surface heat exchange core be self-supporting, but the design of the inlet and outlet collector components, enhanced heat transfer baffles, and diversion baffles also meet the self-supporting conditions. The entire heat exchanger can be printed in an integrated manner, avoiding the leakage and stress cracking problems that may be caused by welding of traditional heat exchangers, thereby enhancing the reliability of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a cross-sectional view of a high heat exchange and low flow resistance microchannel heat exchanger in an embodiment of the present invention;

[0027] Figure 2 It is a structural schematic diagram of an import and export collector component in an embodiment of the present invention;

[0028] Figure 3 2 is a schematic structural diagram of a three-period minimal curved surface heat exchange core according to an embodiment of the present invention;

[0029] Figure 4 is a schematic structural diagram of a three-periodic minimal surface cell in an embodiment of the present invention;

[0030] Figure 5 It is a partial schematic diagram of a powder discharge hole in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments disclosed in the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] The present invention discloses a high heat exchange and low flow resistance microchannel heat exchanger, which is based on triply periodic minimal surfaces (TPMS), not only has high compactness, but also has a smooth surface and uniform curvature radius, and has uniform stress distribution when loaded, and can be applied to high temperature and high pressure occasions. Among them, the triply periodic minimal surface is composed of continuous and interconnected surfaces, and the average curvature is zero. Because it has a smooth and continuous connection surface structure in three directions, it can avoid stress concentration problems and is particularly suitable for 3D printing processes; in addition, it has many advantages such as a higher surface area-to-volume ratio, good internal flow channel connectivity, and high heat exchange efficiency.

[0033] Reference Figure 1 In this embodiment, the high heat exchange and low flow resistance microchannel heat exchanger includes: a shell 1, a three-period minimal surface heat exchange core 2, an inlet collector assembly 3, an outlet collector assembly 4, an enhanced heat exchange baffle 5 and a diversion partition 6.

[0034] The three-period minimal surface heat exchange core 2 is arranged inside the shell 1 .

[0035] A diverter baffle 6 is arranged at the central axis position of the three-period minimal curved surface heat exchange core 2. The three-period minimal curved surface heat exchange core 2 is divided into two independent left and right parts by the diverter baffle 6, presenting a parallel structure. The parallel structure design can effectively reduce the flow dead zone of the large volume cavity of the shell and improve the heat exchange efficiency.

[0036] In order to reduce the flow dead zone, an enhanced heat exchange baffle 5 is designed in the three-period minimal curved surface heat exchange core 2 to change the flow path of the cold fluid. The cold fluid domain of the enhanced heat exchange baffle 5 is fully filled into a solid, and the hot fluid domain is still unobstructed. Specifically: the enhanced heat exchange baffle 5 is set in the center of the left and right parts of the three-period minimal curved surface heat exchange core 2; by blocking the cold fluid channel of the enhanced heat exchange baffle 5, the hot fluid channel of the enhanced heat exchange baffle 5 is opened, so that the enhanced heat exchange baffle 5 is embedded in the three-period minimal curved surface heat exchange core 2; blocked by the enhanced heat exchange baffle 5, the cold fluid flows in the three-period minimal curved surface heat exchange core 2 in a "J"-shaped trajectory, the path is significantly increased, and the heat exchange amount is significantly increased.

[0037] There are two inlet collector assemblies 3 and outlet collector assemblies 4. The first inlet collector assembly and the first outlet collector assembly are radially arranged on one side of the shell 1 and communicated with the left part of the three-period minimal curved surface heat exchange core 2; the second inlet collector assembly and the second outlet collector assembly are radially arranged on the other side of the shell 1 and communicated with the right part of the three-period minimal curved surface heat exchange core 2.

[0038] In this embodiment, the three-periodic minimal surface heat exchange core 2 has a square structure as a whole, and includes a plurality of interconnected three-periodic minimal surface cells 16. Among them, the plurality of three-periodic minimal surface cells 16 are connected in arrays in three directions of the Cartesian coordinate system, and divide the space into a cold fluid domain 19 and a hot fluid domain 20 that are not connected to each other, such as Figure 3 shown.

[0039] like Figure 4 As shown in the figure, the entire three-periodic minimal surface heat exchange core has the same cell structure, which makes the performance evaluation of the three-periodic minimal surface heat exchange core possible through simple periodic simulation. Common surfaces include Diamond surface, Gyroid surface and Primitive surface. Compared with other surfaces, Diamond surface has extremely high compactness and excellent heat transfer performance. The present invention uses Diamond surface, and its mathematical expression is:

[0040]

[0041] Where (x, y, z) represents the coordinate axes, L and C represent the parameters controlling the cell size and cell porosity, respectively.

[0042] When the wall thickness is determined, the mechanical properties and heat transfer performance of the three-periodic minimal surface heat exchange core can be quickly evaluated through periodic simulation, so as to select the appropriate cell size L and porosity C. In order to reduce the flow resistance of high-temperature gas, the C value is generally in the range of 0.38 to 0.58, so as to change the space proportion of the low-temperature medium channel and the high-temperature gas channel of the three-periodic minimal surface heat exchange core, so that the volume of the hot fluid domain is much larger than the volume of the cold fluid domain, and the gas flow resistance is reduced. After determining the appropriate cell size L and porosity C according to the design requirements, the cell is generated in the Ntoplogy software, and the complete three-periodic minimal surface heat exchange core is obtained through the array in three directions of the Cartesian coordinate system.

[0043] In this embodiment, if Figure 2 As shown, the inlet collector assembly 3 mainly includes: an inlet collector flange 7, an inlet collector 8, a rectifier plate 9, a diverter column 10 and an inlet reducer pipe 11. In order to make the low-temperature medium enter the three-period minimal curved surface heat exchange core 2 evenly, after the low-temperature medium enters the inlet reducer pipe 11 from the inlet collector flange 7, it first flows through the diverter column 10 of the triangular prism configuration to achieve preliminary diversion, and then enters the inlet collector 8, and enters the three-period minimal curved surface heat exchange core 2 after passing through the rectifier plate 9. Further, a plurality of rectifier holes 12 are evenly arranged on the rectifier plate 9 for secondary equalization of the low-temperature medium. Further, in order to avoid generating a large flow resistance, the total area of ​​the plurality of rectifier holes is greater than the inlet area of ​​the inlet collector assembly 3. Further, the inlet collector assembly 3 is self-supportingly formed: the cross section of the inlet reducer pipe 11 transitions from a circle to an ellipse along the flow direction of the low-temperature medium; the cross section of the inlet collector 8 is a fan-shaped structure, and the inclination angle of each point of the arc is greater than 45°.

[0044] In this embodiment, if Figure 2 As shown, the outlet collector assembly 4 mainly includes: an outlet collector flange 13, an outlet reducer pipe 14 and an outlet collector 15. After sufficient heat exchange, the low-temperature medium is gathered from the cold fluid domain 19 of the three-period minimal surface heat exchange core 2 to the outlet collector 15, and flows out from the outlet collector flange 13 after passing through the outlet reducer pipe 14. Furthermore, the outlet collector assembly 4 is self-supportingly formed: the cross section of the outlet reducer pipe 14 transitions from an elliptical shape to a circular shape along the flow direction of the low-temperature medium; the cross section of the outlet collector 15 is a fan-shaped structure, and the inclination angle of each point of the arc is greater than 45°.

[0045] In this embodiment, in order to realize the integrated printing of the microchannel heat exchanger, a shell inlet flange 17 is provided at the large end of the shell, and a shell outlet flange 18 is provided at the small end.

[0046] In this embodiment, the heat exchanger as a whole adopts a double-inlet and double-outlet parallel structure. When working: the low-temperature medium enters the inlet collector 8 from the inlet collector flanges 7 on both sides of the shell 1, flows through the rectifier plate 9 and evenly enters the cold fluid domain 19 of the three-period minimal surface heat exchange core 2; at the same time, the high-temperature gas enters the hot fluid domain 20 of the three-period minimal surface heat exchange core 2 from the shell inlet flange 17; after the low-temperature medium in the cold fluid domain 19 and the high-temperature gas in the hot fluid domain 20 are fully exchanged, the low-temperature medium converges to the outlet collectors 15 on both sides, flows out through the outlet collector flange 13, and is discharged from the high-temperature gas shell outlet flange 18. The above parallel design can not only increase the flow rate of the low-temperature medium and improve the heat exchange capacity, but also reduce the flow dead zone and enhance the heat exchange area, so that the heat exchanger meets the design requirements of high heat exchange.

[0047] In this embodiment, in order to facilitate the discharge of metal powder remaining after printing, the high heat exchange and low flow resistance microchannel heat exchanger further includes: a plurality of semi-elliptical powder discharge holes 23. Figure 5 As shown, the powder discharge hole 23 is arranged close to the edge of the outlet collector assembly 4, including: an internal powder discharge hole and an external powder discharge hole. The internal powder discharge hole is used to transfer the powder in the internal trapezoidal support area 21 to the external trapezoidal support area 22; the external powder discharge hole is used to discharge the powder in the external trapezoidal support area 22 to the outside of the shell 1.

[0048] In this embodiment, the high heat transfer and low flow resistance microchannel heat exchanger is integrally printed using additive manufacturing technology. The printing material can be stainless steel powder or titanium alloy powder. The former has higher thermal conductivity and the latter has lower density. Both materials have mature printing processes.

[0049] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

[0050] The contents not described in detail in the specification of the present invention belong to the common knowledge of the professionals in this field.

Claims

1. A high heat transfer and low flow resistance microchannel heat exchanger, characterized in that: include: A shell (1), a three-period minimal surface heat exchange core (2), an inlet collector assembly (3), an outlet collector assembly (4), an enhanced heat exchange baffle (5) and a flow dividing baffle (6); The three-period minimal curved surface heat exchange core (2) is arranged inside the shell (1); A flow dividing baffle (6) is arranged at the central axis position of the three-period minimal curved surface heat exchange core (2); wherein the three-period minimal curved surface heat exchange core (2) is divided into two independent left and right parts by the flow dividing baffle (6), presenting a parallel structure; The enhanced heat exchange baffle (5) is arranged at the center of the left and right parts of the three-period minimal curved surface heat exchange core (2); by blocking the cold fluid channel of the enhanced heat exchange baffle (5), the hot fluid channel of the enhanced heat exchange baffle (5) is opened, so that the enhanced heat exchange baffle (5) is embedded in the three-period minimal curved surface heat exchange core (2); blocked by the enhanced heat exchange baffle (5), the cold fluid flows in the three-period minimal curved surface heat exchange core (2) in a "X"-shaped trajectory; There are two inlet collector assemblies (3) and two outlet collector assemblies (4); wherein the first inlet collector assembly and the first outlet collector assembly are radially arranged on one side of the shell (1) and are connected to the left part of the three-period minimal curved surface heat exchange core (2); and the second inlet collector assembly and the second outlet collector assembly are radially arranged on the other side of the shell (1) and are connected to the right part of the three-period minimal curved surface heat exchange core (2).

2. The high heat exchange and low flow resistance microchannel heat exchanger according to claim 1, characterized in that: The three-periodic minimal surface heat exchange core (2) has an overall square structure and comprises a plurality of interconnected three-periodic minimal surface cells (16); wherein the plurality of three-periodic minimal surface cells (16) are connected in an array in three directions of a Cartesian coordinate system and divide the space into a cold fluid domain (19) and a hot fluid domain (20) that are not interconnected.

3. The high heat exchange and low flow resistance microchannel heat exchanger according to claim 2, characterized in that: The inlet collector assembly (3) comprises: an inlet collector flange (7), an inlet collector (8), a rectifying plate (9), a flow dividing column (10) and an inlet reducing pipe (11); wherein, after the low-temperature medium enters the inlet reducing pipe (11) from the inlet collector flange (7), it first flows through the flow dividing column (10) of a triangular prism configuration to achieve preliminary flow division, then enters the inlet collector (8), and then enters the three-period minimal surface heat exchange core (2) after passing through the rectifying plate (9).

4. The high heat exchange and low flow resistance microchannel heat exchanger according to claim 3, characterized in that: A plurality of rectifying holes (12) are evenly arranged on the rectifying plate (9) for performing secondary flow equalization on the low-temperature medium; wherein the total area of ​​the plurality of rectifying holes is greater than the inlet area of ​​the inlet collector assembly (3).

5. The high heat exchange and low flow resistance microchannel heat exchanger according to claim 3, characterized in that: The outlet collector assembly (4) comprises: an outlet collector flange (13), an outlet reducing pipe (14) and an outlet collector (15); wherein, after sufficient heat exchange, the low-temperature medium is gathered from the cold fluid domain (19) of the three-period minimal surface heat exchange core (2) to the outlet collector (15), and flows out from the outlet collector flange (13) after passing through the outlet reducing pipe (14).

6. The high heat exchange and low flow resistance microchannel heat exchanger according to claim 5, characterized in that: The inlet collector assembly (3) is self-supportingly formed: the cross section of the inlet reducer pipe (11) transitions from a circular shape to an elliptical shape along the flow direction of the low-temperature medium; the cross section of the inlet collector (8) is a fan-shaped structure, and the inclination angle of each point of the arc is greater than 45°; The outlet collector assembly (4) is self-supportingly formed: the cross section of the outlet reducer pipe (14) transitions from an elliptical shape to a circular shape along the flow direction of the low-temperature medium; the cross section of the outlet collector (15) is a fan-shaped structure, and the inclination angle of each point of the arc is greater than 45°.

7. The high heat exchange and low flow resistance microchannel heat exchanger according to claim 6, characterized in that: The large end of the shell is provided with a shell inlet flange (17), and the small end is provided with a shell outlet flange (18).

8. The high heat exchange and low flow resistance microchannel heat exchanger according to claim 7, characterized in that: The heat exchanger as a whole adopts a double-inlet and double-outlet parallel structure. When in operation: low-temperature medium enters the inlet collector (8) from the inlet collector flanges (7) on both sides of the shell (1), flows through the rectifier plate (9) and evenly enters the cold fluid domain (19) of the three-period minimal curved surface heat exchange core (2); at the same time, high-temperature combustion gas enters the hot fluid domain (20) of the three-period minimal curved surface heat exchange core (2) from the shell inlet flange (17); after sufficient heat exchange between the low-temperature medium in the cold fluid domain (19) and the high-temperature combustion gas in the hot fluid domain (20), the low-temperature medium converges to the outlet collectors (15) on both sides, flows out through the outlet collector flanges (13), and is discharged from the high-temperature combustion gas shell outlet flange (18).

9. The high heat exchange and low flow resistance microchannel heat exchanger according to claim 1, characterized in that: Also includes: A plurality of semi-elliptical powder discharge holes (23); the powder discharge holes (23) are arranged close to the edge of the outlet collector assembly (4), and include: internal powder discharge holes and external powder discharge holes; wherein the internal powder discharge holes are used to transfer powder from the internal trapezoidal support area (21) to the external trapezoidal support area (22); and the external powder discharge holes are used to discharge powder from the external trapezoidal support area (22) to the outside of the shell (1).

10. The high heat exchange and low flow resistance microchannel heat exchanger according to claim 1, characterized in that: The heat exchanger is integrally printed using additive manufacturing technology, where the printing material is stainless steel powder or titanium alloy powder.

Images