Efficient heat exchanger based on three-period minimal curved surface

Abstract

The invention discloses an efficient heat exchanger based on a three-period minimal curved surface, and belongs to the technical field of heat exchangers, the efficient heat exchanger comprises a heat exchanger shell and a heat exchange core body, and the heat exchanger shell is provided with a hot fluid inlet, a hot fluid outlet, a cold fluid inlet and a cold fluid outlet; the heat exchange core body is arranged in the heat exchanger shell and is formed by regularly arranging a plurality of three-period tiny curved surface crystal lattices, and the curved surface crystal lattice structures form a hot fluid region, a cold fluid region and a core body inner wall. According to the invention, the manufacturing efficiency is high, the leakage risk is low, the heat exchange performance is high, the flow resistance is small, the cost is low, the weight is light, the inlet and outlet blocks matched with the inlet and outlet can be randomly arranged on the whole heat exchanger, the structural form of the joint can be made into any shape, the matching of system assembly is greatly improved, and in addition, the porosity, wall thickness and the like of lattices can be parametrically controlled. The design and development speed is high.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and particularly to a high-efficiency heat exchanger based on a triply periodic minimal surface. Background Art

[0002] Traditional plate-fin heat exchangers are formed by stacking stamped plates and fins layer by layer and then welding them in a brazing furnace. The process of designing and verifying the heat exchanger is quite long, requiring the opening of stamping dies for different plate types and corresponding welding fixtures. If the performance verification is unqualified, the die needs to be repaired repeatedly. In addition, the traditional plate stamping process and joint machining process have limitations in structural design and manufacturing technology, and only regular heat exchange structures can be developed. For high-demand and high-performance heat exchange applications in fields such as aerospace, automotive, marine, and electronic devices, traditional heat exchangers cannot well meet the usage requirements. These applications generally require heat exchangers with small volume and weight, high heat exchange efficiency, and low flow resistance. However, in order to achieve high heat exchange efficiency, general heat exchangers need to be made very large, resulting in large volume, heavy weight, and high cost, or making the internal fin and other flow disturbance features more dense, but the flow resistance will also increase significantly, and the manufacturing of these dense flow disturbance features is difficult and the rejection rate is high.

[0003] For high-demand and high-performance heat exchange applications in fields such as aerospace, automotive, marine, and electronic devices, new types of compact heat exchangers with high heat exchange efficiency and low flow resistance need to be developed. Under the same conditions, a new type of heat exchanger based on a triply periodic minimal surface has outstanding advantages such as strong comprehensive heat exchange ability, good structural mechanical properties, and low medium flow resistance, and is more suitable for high-performance requirements. The triply periodic minimal surface is a bionic structure that exists in many biological structures, such as the exoskeletons of weevils and beetles. It has been found that this structure has good mechanical and thermal properties. At the same time, additive manufacturing technology has matured in the aerospace field and expanded to industries such as biomedicine and automotive, providing feasibility for the manufacturing of complex lattice structures and bionic structures, enabling the triply periodic minimal surface structure to be applied to new heat exchangers. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-efficiency heat exchanger based on a triply periodic minimal surface to solve the above problems, improve the manufacturing efficiency, reduce the leakage risk, enhance the heat exchange performance, and have low cost and strong adaptability.

[0005] Technical Solution: The present invention provides a high-efficiency heat exchanger based on a triply periodic minimal surface, including: a heat exchanger housing, a heat exchange core. The heat exchanger housing is provided with a hot fluid inlet, a hot fluid outlet, a cold fluid inlet, and a cold fluid outlet; the heat exchange core is arranged inside the heat exchanger housing and is formed by regularly arranging a plurality of triply periodic minimal surface lattices, and these surface lattice structures form a hot fluid domain, a cold fluid domain, and the inner wall of the core.

[0006] Furthermore, for the above-mentioned efficient heat exchanger based on triply periodic minimal surface, the hot fluid inlet, hot fluid outlet, cold fluid inlet, and cold fluid outlet are respectively connected to the hot fluid domain and the cold fluid domain, and the wall thickness of the inner wall of the core body in the heat exchange core at the connection increases, so that the flow channels of the hot fluid domain and the cold fluid domain at the corresponding positions become smaller.

[0007] Furthermore, for the above-mentioned efficient heat exchanger based on triply periodic minimal surface, the heat exchanger shell and the heat exchange core are integrally formed by additive manufacturing technology.

[0008] Furthermore, for the above-mentioned efficient heat exchanger based on triply periodic minimal surface, the hot fluid inlet, hot fluid outlet, cold fluid inlet, and cold fluid outlet can be arranged on the same surface of the heat exchanger shell, or the hot fluid inlet and hot fluid outlet are on the same surface of the heat exchanger shell, and the cold fluid inlet and cold fluid outlet are on another surface of the heat exchanger shell.

[0009] Furthermore, for the above-mentioned efficient heat exchanger based on triply periodic minimal surface, the hot fluid inlet and hot fluid outlet can be replaced with a joint with the same inlet and outlet, and the cold fluid inlet and cold fluid outlet can also be replaced with a joint with the same inlet and outlet.

[0010] Furthermore, for the above-mentioned efficient heat exchanger based on triply periodic minimal surface, the interface forms of the hot fluid inlet, hot fluid outlet, cold fluid inlet, and cold fluid outlet can be set into any shape according to requirements.

[0011] Furthermore, for the above-mentioned efficient heat exchanger based on triply periodic minimal surface, heat fluid inlet blocks, heat fluid outlet blocks, cold fluid inlet blocks, and cold fluid outlet blocks are respectively arranged at the connections between the hot fluid inlet, hot fluid outlet, cold fluid inlet, cold fluid outlet and the hot fluid domain and the cold fluid domain. The heat fluid inlet blocks and heat fluid outlet blocks are connected to the hot fluid domain and are used to block the cold fluid domain. The cold fluid inlet blocks and cold fluid outlet blocks are connected to the cold fluid domain and are used to block the hot fluid domain.

[0012] Furthermore, for the above-mentioned efficient heat exchanger based on triply periodic minimal surface, the triply periodic minimal surface lattice structure in the heat exchange core is based on parametric design and can be directly controlled by function expression parameters, and can be adjusted according to actual needs.

[0013] Furthermore, for the above-mentioned efficient heat exchanger based on triply periodic minimal surface, the hot fluid domain and the cold fluid domain are arranged alternately.

[0014] Furthermore, for the above-mentioned efficient heat exchanger based on triply periodic minimal surface, there are multiple groups of cycles from top to bottom in the heat exchange core, and one group of cycles includes 6 fluid paths.

[0015] As can be seen from the above technical solutions, the present invention has the following beneficial effects: An efficient heat exchanger based on triply periodic minimal surfaces of the present invention realizes the integral molding of the heat exchanger product through additive manufacturing technology, reduces the mold opening, trial molding, lamination assembly, welding, etc. of components. The process is simple, and there is no welding interface between components, with low leakage risk, high heat transfer performance, and small flow resistance. The integrated molding can avoid material waste. Under the same heat transfer requirement, the heat exchanger is lighter in weight, the interface can be set into any shape according to requirements, with strong adaptability, parametric design of the lattice structure, and faster design and development speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of an efficient heat exchanger based on triply periodic minimal surfaces of the present invention; Figure 2 is a schematic diagram of the heat exchange core of the present invention; Figure 3 is a schematic cross-section of the fluid circulation of the heat exchange core of the present invention Figure 1 ; Figure 4 is a schematic cross-section of the fluid circulation of the heat exchange core of the present invention Figure 2 ; Figure 5 is a schematic cross-section of the fluid circulation of the heat exchange core of the present invention Figure 3 ; Figure 6 is a schematic cross-section of the fluid circulation of the heat exchange core of the present invention Figure 4 ; Figure 7 is a schematic cross-section of the fluid circulation of the heat exchange core of the present invention Figure 5 ; Figure 8 is a schematic cross-section of the fluid circulation of the heat exchange core of the present invention Figure 6 .

[0017] In the figure: heat exchanger housing 1, heat exchange core 2, hot fluid inlet 11, hot fluid outlet 12, cold fluid inlet 13, cold fluid outlet 14, hot fluid domain 21, cold fluid domain 22, inner wall of the core 23. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Embodiment 1 As Figure 1-2An efficient heat exchanger based on triply periodic minimal surfaces is shown, including: a heat exchanger housing 1 and a heat exchange core 2. A hot fluid inlet 11, a hot fluid outlet 12, a cold fluid inlet 13, and a cold fluid outlet 14 are provided on the heat exchanger housing 1. The heat exchange core 2 is arranged inside the heat exchanger housing 1 and is formed by arranging many triply periodic minimal surface lattices regularly. These surface lattice structures form a hot fluid domain 21, a cold fluid domain 22, and an inner wall 23 of the core. The heat exchanger housing 1 and the heat exchange core 2 are integrally formed by an additive manufacturing process. The triply periodic minimal surface lattice structure has a large specific surface area and a very smooth surface, without sharp turns or connection points of a lattice porous structure, and the overall structure is interconnected, with a large heat exchange area and a small flow resistance, effectively improving the heat exchange performance.

[0019] In this embodiment, the hot fluid inlet 11, the hot fluid outlet 12, the cold fluid inlet 13, and the cold fluid outlet 14 are respectively communicated with the hot fluid domain 21 and the cold fluid domain 22, and the wall thickness of the inner wall 23 of the core in the heat exchange core 2 at the connection part increases, so that the flow channels of the hot fluid domain 21 and the cold fluid domain 22 at the corresponding positions become smaller. When the heat exchanger works, the hot fluid enters the heat exchange core 2 from the hot fluid inlet 11. Since the flow channels around the inlet and outlet joints are slightly smaller, the flow resistance will be slightly larger, forcing the hot fluid to spread to the entire heat exchange core 2 and then flow out from the outlet. The cold fluid enters the heat exchange core 2 from the cold fluid inlet 13. Since the flow channels around the inlet and outlet joints are slightly smaller, it will also force the cold fluid to spread to the entire heat exchange core 2 and then flow out from the outlet. Finally, the hot fluid medium and the cold fluid medium are fully heat exchanged at the entire heat exchange core 2 part.

[0020] As Figure 2 shown, for an efficient heat exchanger based on triply periodic minimal surfaces, the triply periodic minimal surface lattice structure in the heat exchange core 2 is based on parametric design and can be directly controlled by function expression parameters, and can be adjusted according to actual needs.

[0021] In this embodiment, the hot fluid domain 21 and the cold fluid domain 22 are arranged alternately.

[0022] As Figures 3-8 shown, for an efficient heat exchanger based on triply periodic minimal surfaces, there are multiple groups of cycles from top to bottom in the heat exchange core 2, and one group of cycles includes 6 fluid paths.

[0023] Embodiment 2 On the basis of Embodiment 1, in this embodiment, as Figure 1An efficient heat exchanger based on triply periodic minimal surfaces is shown. The hot fluid inlet 11, hot fluid outlet 12, cold fluid inlet 13, and cold fluid outlet 14 can be arranged on the same surface of the heat exchanger housing 1, or the hot fluid inlet 11 and hot fluid outlet 12 are on the same surface of the heat exchanger housing 1, and the cold fluid inlet 13 and cold fluid outlet 14 are on another surface of the heat exchanger housing 1; the interface forms of the hot fluid inlet 11, hot fluid outlet 12, cold fluid inlet 13, and cold fluid outlet 14 can be set into any shape according to requirements. This greatly improves the matching of system assembly.

[0024] In this embodiment, the hot fluid inlet 11 and hot fluid outlet 12 can be replaced with a joint with the same inlet and outlet, and the cold fluid inlet 13 and cold fluid outlet 14 can also be replaced with a joint with the same inlet and outlet.

[0025] As Figure 2 An efficient heat exchanger based on triply periodic minimal surfaces is shown. At the connections between the hot fluid inlet 11, hot fluid outlet 12, cold fluid inlet 13, cold fluid outlet 14 and the hot fluid domain 21, cold fluid domain 22, there are respectively arranged a hot fluid inlet block, a hot fluid outlet block, a cold fluid inlet block, and a cold fluid outlet block. The hot fluid inlet block and hot fluid outlet block are connected to the hot fluid domain 21 and are used to block the cold fluid domain 22, and the cold fluid inlet block and cold fluid outlet block are connected to the cold fluid domain 22 and are used to block the hot fluid domain 21.

[0026] It should be noted that the above is only the technical solution of the invention rather than a limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solution of the invention can be modified or equivalently replaced without departing from the scope of the technical solution of the present invention, and it should all be covered by the scope of the claims of the present invention.

Claims

1. A high-efficiency heat exchanger based on a three-periodic minimal surface, characterized in that: include: A heat exchanger shell (1), wherein the heat exchanger shell (1) is provided with a hot fluid inlet (11), a hot fluid outlet (12), a cold fluid inlet (13), and a cold fluid outlet (14); A heat exchange core (2), the heat exchange core (2) being arranged in the heat exchanger shell (1), and being formed by a plurality of regularly arranged three-periodic minimal curved surface lattices, and these curved surface lattice structures forming a hot fluid domain (21), a cold fluid domain (22) and an inner wall (23) of the core; The hot fluid inlet (11), the hot fluid outlet (12), the cold fluid inlet (13), and the cold fluid outlet (14) are respectively connected to the hot fluid domain (21) and the cold fluid domain (22), and the thickness of the inner wall (23) of the heat exchange core (2) at the connection is increased, so that the flow channels of the hot fluid domain (21) and the cold fluid domain (22) at the corresponding positions become smaller.

2. The high-efficiency heat exchanger based on three-periodic minimal surfaces according to claim 1, characterized in that: The heat exchanger shell (1) and the heat exchange core (2) are integrally manufactured using an additive manufacturing process.

3. The high-efficiency heat exchanger based on three-periodic minimal surfaces according to claim 1, characterized in that: The hot fluid inlet (11), the hot fluid outlet (12), the cold fluid inlet (13), and the cold fluid outlet (14) can be arranged on the same surface of the heat exchanger shell (1), or the hot fluid inlet (11) and the hot fluid outlet (12) are on the same surface of the heat exchanger shell (1), and the cold fluid inlet (13) and the cold fluid outlet (14) are on another surface of the heat exchanger shell (1).

4. The high-efficiency heat exchanger based on a three-periodic minimal surface according to claim 1, characterized in that: The hot fluid inlet (11) and the hot fluid outlet (12) can be replaced with a joint with the same inlet and outlet, and the cold fluid inlet (13) and the cold fluid outlet (14) can also be replaced with a joint with the same inlet and outlet.

5. The high-efficiency heat exchanger based on three-periodic minimal surfaces according to claim 1, characterized in that: The interface forms of the hot fluid inlet (11), the hot fluid outlet (12), the cold fluid inlet (13), and the cold fluid outlet (14) can be set to any shape according to requirements.

6. The high-efficiency heat exchanger based on three-periodic minimal surfaces according to claim 1, characterized in that: A hot fluid inlet block, a hot fluid outlet block, a cold fluid inlet block, and a cold fluid outlet block are respectively provided at the connection points between the hot fluid inlet (11), the hot fluid outlet (12), the cold fluid inlet (13), the cold fluid outlet (14) and the hot fluid domain (21), and the cold fluid domain (22); the hot fluid inlet block and the hot fluid outlet block are connected to the hot fluid domain (21) to block the cold fluid domain (22); and the cold fluid inlet block and the cold fluid outlet block are connected to the cold fluid domain (22) to block the hot fluid domain (21).

7. The high-efficiency heat exchanger based on three-periodic minimal surfaces according to claim 1, characterized in that: The three-periodic minimal surface lattice structure in the heat exchange core (2) is based on parametric design and is directly controlled by function expression parameters, and can be adjusted according to actual needs.

8. The high-efficiency heat exchanger based on three-periodic minimal surfaces according to claim 1, characterized in that: The hot fluid domains (21) and the cold fluid domains (22) are arranged alternately.

9. The high-efficiency heat exchanger based on three-periodic minimal surfaces according to claim 1, characterized in that: The heat exchange core (2) has multiple groups of circulations from top to bottom, wherein one group of circulations includes 6 fluid paths.

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