Multi-coupling bionic microchannel plate heat exchanger

Abstract

The utility model discloses a multi-coupling bionic microchannel plate heat exchanger, and belongs to the technical field of heat exchangers. A plurality of wing-shaped fins are distributed on each heat exchange plate, and the wing-shaped fin heat exchanger is characterized in that a leaf vein structure composed of main veins and secondary veins is further arranged on each heat exchange plate; the main pulse is located on the central axis of the heat exchange plate, the included angle between the main pulse and the secondary pulse is 30-60 degrees, and the space, except the wing-shaped fins, the main pulse and the secondary pulse, on the heat exchange plate is a fluid channel. The overall structure is compact, the heat exchange performance and the ultimate bearing capacity of the heat exchanger can be remarkably improved, and good application prospects are achieved.

Description

Technical Field

[0001] This utility model relates to the field of microchannel heat exchanger technology, specifically to a multi-coupled biomimetic microchannel plate heat exchanger. Background Technology

[0002] Compared to traditional shell-and-tube heat exchangers, microchannel heat exchangers offer advantages such as high thermal efficiency, compact structure, high pressure resistance, and safety and reliability. Printed circuit board heat exchangers (PCHEs), a type of microchannel heat exchanger, are widely used in various fields, including heat exchange in solid oxide fuel cell (SOFC) systems, cooling and waste heat recovery in nuclear power systems, and cooling and thermal management systems for aero-engines. They play a crucial role in system heat exchange and exhibit outstanding advantages in extremely harsh working environments such as high temperature, high pressure, and space constraints, providing efficient solutions for microfluidic systems and miniature heat exchange.

[0003] PCHEs are manufactured using electrochemical etching to directly etch flow channels onto metal plates, which are then stacked together using vacuum diffusion welding to assemble the heat exchange core. This manufacturing process allows for the design of various complex flow channel patterns for more efficient heat transfer. Because the diffusion welding process is carried out under high pressure and high temperature conditions, PCHEs can withstand harsh operating conditions without breaking down or corroding. Compared to shell-and-tube heat exchangers, PCHEs are lighter and smaller, further reducing manufacturing costs. Compared to other types of heat exchangers, the microchannel structure of PCHEs increases the heat transfer area, resulting in better heat transfer performance.

[0004] The flow channel structures commonly used in PCHE (Printed Circuit Heat Exchanger) include straight channels, Z-shaped channels, S-shaped channels, and airfoil channels. Common channel cross-sections include circular, semi-circular, triangular, and rectangular shapes, while channel arrangements are mainly single-layer, double-layer, and four-layer configurations. Currently, the rectangular cross-section airfoil channel is the best performing form, but its overall performance still needs improvement. Therefore, it is necessary to optimize the structure of the printed circuit board heat exchanger core to obtain a microchannel plate heat exchanger with better overall heat exchange performance. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a multi-coupled biomimetic microchannel heat exchange plate.

[0006] This utility model is achieved through the following technical solution:

[0007] A multi-coupled biomimetic microchannel plate heat exchanger comprises multiple stacked heat exchange plates, each heat exchange plate having a number of airfoil fins distributed on it, including: a leaf vein structure composed of primary veins and secondary veins is also provided on the heat exchange plate.

[0008] The main vein is located on the central axis of the heat exchange plate, and the angle between the main vein and the secondary vein is 30~60°. The space on the heat exchange plate other than the airfoil, the main vein and the secondary vein are fluid channels.

[0009] Furthermore, the airfoil has a symmetrical structure, with the airfoil height and the main vein height H2 being the same as the fluid channel height; the secondary vein height H3 is half of the fluid channel height h2.

[0010] Furthermore, the ratio of the width of the main vein to the width of the secondary vein is 1 to 2.5, and the ratio of the length of the main vein to the distance between the center lines S3 of the two secondary veins is 5 to 25.

[0011] Furthermore, the airfoil fins of the adjacent heat exchange plates face opposite directions to the fluid flow direction in the fluid channel, and are used as cold fluid heat exchange plates and hot fluid heat exchange plates, respectively.

[0012] Furthermore, the fluid inlet of the heat exchange plate is located on one side of the leading edge of the airfoil, and the fluid outlet is located on one side of the trailing edge of the airfoil.

[0013] Each heat exchange plate has a pre-reserved fluid inlet and fluid outlet; the airfoil fins of the adjacent heat exchange plates face opposite directions and the fluid flow direction in the fluid channel are opposite, and they are used as cold fluid heat exchange plates and hot fluid heat exchange plates respectively.

[0014] Furthermore, the heat exchange plates are sealed by diffusion welding, the thickness of the heat exchange plates is 2-8 mm, the height of the fluid channel is 2-4 mm, and the ratio of the thickness of the heat exchange plates to the height of the fluid channel is in the range of 1-2.

[0015] Furthermore, the airfoil fins are arranged in a staggered manner on the heat exchange plate, with equal spacing between each row of airfoil fins.

[0016] The airfoil is from the NACA00xx series.

[0017] The cross-sectional shape of the secondary vein is rectangular or teardrop-shaped.

[0018] Furthermore, the lateral spacing of the airfoil is 1 to 2 times the length of the airfoil, and the longitudinal spacing of the airfoil is equal to the chord length L of the airfoil. b 2 to 3 times.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] This invention utilizes a leaf vein biomimetic structure, introducing both main and secondary veins, which effectively increases the ultimate load capacity of the heat exchange plate and increases the heat exchange area. The secondary veins further enhance secondary eddy current disturbance, acting as a eddy current generator to enhance the mixing between the wall boundary layer fluid and the main fluid, thereby strengthening boundary layer heat transfer and significantly improving the overall heat exchange performance of the heat exchanger core.

[0021] This invention combines traditional airfoil fins with biomimetic leaf veins, increasing the heat exchange area and improving the compactness of the heat exchanger core. It also enhances the generation of longitudinal vortices in the fluid, resulting in stronger turbulent motion and improving the overall heat exchange performance of the airfoil fins, while ensuring its overall load-bearing capacity and heat exchange effect. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a multi-coupled biomimetic microchannel plate heat exchanger core according to an exemplary embodiment;

[0023] Figure 2 This is a top view of a multi-coupled biomimetic microchannel plate heat exchanger core according to an exemplary embodiment;

[0024] Figure 3 This is a schematic diagram of a rectangular cross-section secondary vein according to an exemplary embodiment;

[0025] Figure 4 This is a schematic diagram of a teardrop-shaped cross-section secondary vein according to an exemplary embodiment;

[0026] Figure 5 This is a front view of a core of a biomimetic microchannel plate heat exchanger with multiple couplings, according to an exemplary embodiment.

[0027] Figure 6 This is a side view of an airfoil according to an exemplary embodiment;

[0028] Figure 7 This is a side view of a biomimetic leaf vein structure shown according to an exemplary embodiment;

[0029] Figure 8 This is a top view of a multi-coupled biomimetic microchannel plate heat exchanger according to an exemplary embodiment;

[0030] Figure 9 This is a schematic diagram of airfoil fin arrangement parameters according to an exemplary embodiment. Detailed Implementation

[0031] The present invention will be further explained below with reference to the embodiments and accompanying drawings, but this is not intended to limit the scope of protection of this application.

[0032] like Figure 1 As shown in the figure, this utility model provides a multi-coupled biomimetic microchannel plate heat exchanger, comprising: multiple heat exchange plates 1, multiple airfoil fins 4, and a vein structure, wherein the vein structure is divided into main veins 5 and secondary veins 6. The multiple airfoil fins 4 are arranged at intervals on each heat exchange plate 1, the main veins 5 extending through the entire flow channel, and the secondary veins 6 being evenly arranged on each heat exchange plate 1. The multiple heat exchange plates 1 are stacked on top of each other, and each layer has a pre-reserved fluid inlet and fluid outlet, forming a complete fluid channel. Figure 1 The structure shown is only a partial display of the flow channels of the heat exchange core of the printed circuit board. In actual applications, the number of heat exchange plate layers and the number of airfoil fins need to be set according to the actual situation.

[0033] The airfoil orientations of adjacent heat exchange plates and the fluid flow directions within the fluid channels are opposite, serving as cold fluid heat exchange plates and hot fluid heat exchange plates respectively. That is, if the first heat exchange plate is a hot fluid heat exchange plate, the airfoil orientation of the second heat exchange plate and the fluid flow direction within the fluid channels are opposite to those of the first layer, making it a cold fluid heat exchange plate; the third layer is also a hot fluid heat exchange plate. Figure 1 The example shows two heat exchange plates, with the lower one being a cold fluid heat exchange plate and the upper one being a hot fluid heat exchange plate. Multiple airfoil fins 4 on the upper plate cooperate with the leaf veins 5 to form a cold fluid channel 2 and a hot fluid channel 3, respectively.

[0034] The fluid inlet of each heat exchange plate 1 is located on one side of the leading edge of the airfoil fin 4, and the fluid outlet is located on one side of the trailing edge of the airfoil fin 4. The leading edge of the airfoil fin 4 is blunt, and the trailing edge of the airfoil fin 4 is pointed. Fluid enters from the fluid inlet, passes through the fluid channel, and exits from the fluid outlet. Figure 1 The direction indicated by the middle arrow.

[0035] like Figure 5 As shown, the heat exchange plates 1 are sealed and welded together using a diffusion welding process. The thickness h1 of the heat exchange plate 1 is 2 to 8 mm, and the height h2 of the fluid channels 2 and 3 is 2 to 4 mm. The ratio of the thickness h1 of the heat exchange plate to the height h2 of the fluid channels 2 and 3 is in the range of 1 to 2.

[0036] The airfoil 4 is a naca00xx type airfoil, and the height H1 of the airfoil is the same as the height h2 of the fluid channel.

[0037] The main vein 5 of the leaf has a rectangular cross-section, and its height H2 is the same as the fluid channel height h2. The ratio of the width S1 of the main vein to the width S2 of the secondary vein is between 1 and 2.5. The secondary vein 6 has a rectangular or teardrop-shaped cross-section. The height H3 of the secondary vein 6 is half the fluid channel height h2 (see...). Figure 7 The angle A between the main vein 5 and the secondary vein 6 is 30~60°, and the angle opening faces the leading edge of the airfoil 4 upstream of it (see...). Figure 2 ).

[0038] The ratio of the width of the main vein to the width of the secondary vein is 1 to 2.5, and the ratio of the length of the main vein to the distance between the center lines S3 of the two secondary veins is 5 to 25.

[0039] Multiple airfoil fins 4 are arranged in a staggered manner on the heat exchange plate 1. Furthermore, the lateral spacing L of the airfoil fins is... a For the length L of the airfoil f One to two times the length of the airfoil L f The longitudinal spacing L of the airfoil refers to the distance from the leading edge to the trailing edge. a For the chord length L of the airfoil b 2 to 3 times.

[0040] This invention employs a leaf vein-inspired design on the heat exchange plate, with secondary leaf veins also featuring a second-level biomimetic effect. This enhances the turbulence effect of the airfoil fins on the fluid, increasing heat exchange efficiency. Furthermore, because the height of the main vein fins is the same as the fluid flow channel height, the ultimate load-bearing capacity of the heat exchanger is significantly improved. Additionally, setting the secondary vein height to be smaller than the fluid channel height further enhances the fin's turbulence effect on the fluid, increasing heat exchange efficiency.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of this utility model.

[0042] Any aspects not covered in this utility model are applicable to the prior art.

Claims

1. A multi-coupled biomimetic microchannel plate heat exchanger, comprising multiple stacked heat exchange plates, each heat exchange plate having a plurality of airfoil fins distributed thereon, characterized in that, include: The heat exchange plate is also equipped with a leaf vein structure consisting of main veins and secondary veins; The main vein is located on the central axis of the heat exchange plate, and the angle between the main vein and the secondary vein is 30~60°. The space on the heat exchange plate other than the airfoil, the main vein and the secondary vein are fluid channels.

2. The multi-coupled biomimetic microchannel plate heat exchanger according to claim 1, characterized in that, The airfoil has a symmetrical structure, and the height of the airfoil and the height of the main vein H2 are the same as the height of the fluid channel; the height of the secondary vein H3 is 1 / 2 of the height of the fluid channel h2.

3. The multi-coupled biomimetic microchannel plate heat exchanger according to claim 1, characterized in that, The ratio of the width of the main vein to the width of the secondary vein is 1 to 2.5, and the ratio of the length of the main vein to the distance between the center lines S3 of two adjacent secondary veins is 5 to 25.

4. The multi-coupled biomimetic microchannel plate heat exchanger according to claim 1, characterized in that, Each heat exchange plate has a pre-reserved fluid inlet and fluid outlet; the airfoil fins of the adjacent heat exchange plates face opposite directions and the fluid flow direction in the fluid channel are opposite, and they are used as cold fluid heat exchange plates and hot fluid heat exchange plates respectively.

5. The multi-coupled biomimetic microchannel plate heat exchanger according to claim 4, characterized in that, The fluid inlet of each heat exchange plate is located on one side of the leading edge of the airfoil, and the fluid outlet is located on one side of the trailing edge of the airfoil.

6. The multi-coupled biomimetic microchannel plate heat exchanger according to claim 1, characterized in that, The heat exchange plate has a thickness of 1–8 mm, the fluid channel height has a height of 1–12 mm, and the ratio of the heat exchange plate thickness to the fluid channel height is in the range of 1–2.

7. The multi-coupled biomimetic microchannel plate heat exchanger according to claim 1, characterized in that, The airfoil is a NACA00xx series airfoil; the cross-sectional shape of the secondary vein is rectangular or teardrop-shaped; the airfoil is arranged in a staggered manner on the heat exchange plate, and the spacing between each row of airfoil is equal.

8. The multi-coupled biomimetic microchannel plate heat exchanger according to claim 1, characterized in that, The lateral spacing of the airfoil is 1 to 2 times the length of the airfoil, and the longitudinal spacing of the airfoil is equal to the chord length L of the airfoil. b 2 to 3 times.

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