Gyandroid type three-period minimal curved surface primary surface heat exchanger based on compression method

Abstract

The invention discloses a Gyandroid type three-period minimal curved surface primary surface heat exchanger based on a compression method, belongs to the technical field of heat exchangers, aims to solve the problem of optimizing a typical Gyandroid type TPMS (Tire Pressure Monitor System) to improve the heat exchange performance of the heat exchanger, and is technically characterized in that a compressed Gyandroid type three-period minimal curved surface core body is arranged in an accommodating space; a Gyandroid type three-period minimum curved surface core body is compressed and formed in any coordinate axis direction, a low-temperature working medium channel opening and a high-temperature working medium channel opening are formed in the surface of the compressed Gyandroid type three-period minimum curved surface core body, a low-temperature working medium channel and a high-temperature working medium channel are formed in the compressed Gyandroid type three-period minimum curved surface core body, and the Gyandroid type three-period minimum curved surface core body can be used for oil product cooling in the petrochemical industry. The heat exchanger has the advantages that the spanwise pressure drop is reduced, the heat exchange amount is increased, and the heat exchange effect of the heat exchanger is obviously improved through optimization.

Description

Technical Field

[0001] The invention belongs to the technical field of heat exchangers and relates to a Gyroid type three-period minimal surface primary surface heat exchanger based on a compression method. Background Art

[0002] In the field of petrochemicals, cooling oil products is an important production link. Usually, water or other working fluids are used to cool oil products, and heat exchangers are an important place for heat exchange. Heat exchangers play an indispensable role in the petrochemical industry. By effectively using heat exchangers, production efficiency can be improved, energy consumption can be reduced, and environmental pollution can be reduced. For example, in the oil refining process, heat exchangers are widely used in crude oil heating, oil refining heating, gas recovery and other fields, which can significantly reduce energy consumption and improve production efficiency.

[0003] The typical Gyroid-type TPMS structure is used in heat exchangers, such as CN116933527A, a method and system for designing efficient heat exchanger flow channels based on implicit fields, which discloses the selection of the Gyroid type in three-periodic minimal surfaces as the internal filling structure of the heat exchanger. However, the typical Gyroid-type TPMS still has room for optimization in terms of pressure drop and heat transfer performance. Summary of the invention

[0004] In order to solve the problem of optimizing the typical Gyroid TPMS to improve the heat exchange performance of the heat exchanger, a Gyroid three-period minimal surface primary surface heat exchanger based on a compression method in some embodiments of the present application includes:

[0005] A shell, wherein the shell is formed with a low-temperature working medium inlet and a low-temperature working medium outlet arranged opposite to each other in a first direction, a high-temperature working medium inlet and a high-temperature working medium outlet arranged opposite to each other in a second direction, and an accommodating space, wherein the first direction intersects with the second direction;

[0006] A compressed Gyroid-type three-period minimal surface core is arranged in the accommodating space, and is formed by compression of the Gyroid-type three-period minimal surface core in any coordinate axis direction, and a low-temperature working fluid channel opening and a high-temperature working fluid channel opening are formed on the surface of the compressed Gyroid-type three-period minimal surface core, and a low-temperature working fluid channel and a high-temperature working fluid channel are formed inside;

[0007] The basic governing equation of the Gyroid-type three-periodic minimal surface core is:

[0008] sinXcosY+sinYcosZ+sinZcosX=c;

[0009] Wherein, X=2απx, Y=2βπy, Z=2γπz, where x, y and z are the coordinates of the x-axis, y-axis and z-axis of the spatial rectangular coordinate system established by the lattice cell, α, β, γ are coefficients used to control the size of the lattice cell in the respective corresponding x-axis, y-axis and z-axis directions, and c is a constant used to control the porosity of the overall structure;

[0010] The compressed Gyroid-type three-period minimal surface core is obtained by compressing the Gyroid-type three-period minimal surface core in a single coordinate axis direction, wherein the compression is to adjust the coefficient of the size of the lattice cell in the single coordinate axis direction to be greater than the coefficients of the size of the lattice cell in the other two coordinate axis directions, and the coefficients of the size of the lattice cell in the other two coordinate axis directions are equal;

[0011] The compression direction is the x-axis direction, α=2, β=1, γ=1, and c=0.438.

[0012] According to the Gyroid-type three-period minimal surface primary surface heat exchanger based on the compression method in some embodiments of the present application, the coefficient of the size of the lattice cell in the direction of the single coordinate axis is an integer multiple of the coefficients of the size of the lattice cell in the directions of the other two coordinate axes.

[0013] According to the Gyroid type three-period minimal surface primary surface heat exchanger based on the compression method in some embodiments of the present application, it also includes a first baffle and a second baffle;

[0014] Among the channel openings formed on the surface of the core body, the channel opening with the largest area in the central region and the channel openings separated from the channel opening with the largest area in the central region are one type of channel openings of the low-temperature working medium channel opening and the high-temperature working medium channel opening, and the channel opening adjacent to the channel opening with the largest area in the central region is the other type of channel opening of the low-temperature working medium channel opening and the high-temperature working medium channel opening;

[0015] The first baffle blocks the high-temperature working medium passage opening on the surface of the core in the first direction, leaving the low-temperature working medium passage opening on the surface of the core in the first direction open;

[0016] The second baffle blocks the low-temperature working medium passage opening on the surface of the core in the second direction, leaving the high-temperature working medium passage opening on the surface of the core in the second direction open.

[0017] According to some embodiments of the present application, the Gyroid type three-period minimal surface primary surface heat exchanger based on the compression method further includes:

[0018] A first end cap is formed on the shell and is disposed between the cryogenic medium inlet and the core body, and between the core body and the cryogenic medium outlet, so that the internal space of the first end cap forms a liquid collecting cavity;

[0019] The second head is formed on the shell, arranged between the high-temperature working medium inlet and the core body, and between the core body and the high-temperature working medium outlet, so that the internal space of the second head forms a liquid collecting cavity.

[0020] According to some embodiments of the present application, the Gyroid type three-period minimal surface primary surface heat exchanger based on the compression method further includes:

[0021] The flange is used to fix the first end cap, the second end cap and the working fluid pipeline.

[0022] According to the Gyroid-type three-period minimal surface primary surface heat exchanger based on the compression method in some embodiments of the present application, the side of the compressed Gyroid-type three-period minimal surface core relative to the working fluid inlet and the working fluid outlet is sealed with the inner wall of the shell with a contour edge, and the side of the compressed Gyroid-type three-period minimal surface core opposite to the bottom surface of the shell is sealed with the bottom surface.

[0023] According to the Gyroid-type three-period minimal surface primary surface heat exchanger based on the compression method in some embodiments of the present application, the first direction and the second direction are perpendicular to each other.

[0024] Beneficial effects of the present invention:

[0025] In the first aspect, the present invention compresses a typical Gyroid TPMS structure to obtain a Gyroid three-period minimal surface primary surface heat exchanger based on a compression method. The Gyroid TPMS structure has superior performance among many TPMS structures. The present invention optimizes the performance under the premise that the Gyroid TPMS structure is superior. By introducing a compression method, the specific surface area of ​​the heat exchanger core is greatly improved, the amplitude of the cross-sectional structure is reduced, and drag reduction and efficiency improvement are achieved.

[0026] In the second aspect, the present invention can be used to solve the oil cooling problem in the petrochemical industry. Experimental data show that the heat exchanger of the present invention with a compressed Gyroid-type three-period minimal surface core has reduced the spanwise pressure drop and increased the heat transfer capacity compared to the heat exchanger with a classic Gyroid-type three-period minimal surface core. This optimization significantly improves the heat transfer effect of the heat exchanger.

[0027] In the third aspect, the primary surface heat exchanger A1 of the present invention compresses the core along the x direction, α=2, β=1, γ=1, c=0.438, and has the highest average pressure drop reduction ratio for high-temperature working fluids, and the highest average increase ratio for heat exchange. The average pressure drop reduction ratio and the average increase ratio for heat exchange have the same effect, that is, the synchronous improvement of the pressure drop and the heat exchange effect is achieved, and the effect is optimal. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a cross-sectional structural diagram of the G-TPMS primary surface heat exchanger based on the compression method in Example 1 of the present invention, with compression in the x direction.

[0029] Figure 2 Schematic diagram of the G-TPMS compression core and the G-TPMS compression core with baffles in Example 1 of the present invention, with compression in the x direction.

[0030] Figure 3 Schematic diagram of the G-TPMS compression core and the G-TPMS compression core with baffles in Example 2 of the present invention, compression in the y direction).

[0031] Figure 4 Schematic diagram of the G-TPMS compression core and the G-TPMS compression core with baffles in Example 3 of the present invention, compression in the z direction).

[0032] Figure 5 It is a pressure drop data diagram of the heat exchanger with uncompressed and three-way compressed cores using water as the working fluid, wherein G_HEM represents the uncompressed G-TPMS core, G_x_HEM represents the G-TPMS compressed core compressed in the x-axis direction, G_y_HEM represents the G-TPMS compressed core compressed in the y-axis direction, and G_z_HEM represents the G-TPMS compressed core compressed in the z-axis direction.

[0033] Figure 6 This is the pressure drop data diagram of the heat exchanger with uncompressed and three-way compression core using oil as the working fluid.

[0034] Figure 7 This is a data chart of the heat transfer of the heat exchanger with an uncompressed core and a three-way compressed core.

[0035] In the figure: 100. shell, 101. low-temperature working fluid inlet, 102. low-temperature working fluid outlet, 103. high-temperature working fluid inlet, 104. high-temperature working fluid outlet, 105. first head, 106. second head, 107. flange, 1071. bolt hole, 108. high-temperature working fluid domain, 109. low-temperature working fluid domain, 200. compressed Gyroid-type three-period minimal surface core, 201. low-temperature working fluid channel, 202. high-temperature working fluid channel, 203. first baffle, 204. second baffle. DETAILED DESCRIPTION

[0036] Embodiments of the present application are described in detail below with reference to the accompanying drawings, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions.

[0037] Terminology Note:

[0038] Primary Surface Heat Exchanger (PSR) refers to a heat exchanger in which low and high temperature working fluids transfer heat only through the partition (working fluid channel wall) that separates the low and high temperature working fluids in the heat exchanger.

[0039] Triply Periodic Minimal Surface (TPMS) refers to a special type of porous structure with smooth continuous surface and high specific surface area, whose geometry is defined as the average curvature of each point on the surface is zero. The TPMS structure consists of an interpenetrating and non-intersecting network, whose network has a periodic and ordered topology in three main directions and has symmetry in the crystal space group.

[0040] G-TPMS: Gyroid type three-cycle minimal surface primary surface heat exchanger.

[0041] The present invention is a solution to the oil cooling problem in the petrochemical industry, and of course, is also applicable to other scenarios where the Gyroid-type three-period minimal surface primary surface heat exchanger based on the compression method of the present invention can be used.

[0042] like Figure 1 As shown, a Gyroid type three-period minimal surface primary surface heat exchanger A based on a compression method comprises a shell 100, a compressed Gyroid type three-period minimal surface core 200 and a baffle.

[0043] The shell 100 is formed with a low-temperature working fluid inlet 101 and a low-temperature working fluid outlet 102 arranged relatively in a first direction, a high-temperature working fluid inlet 103 and a high-temperature working fluid outlet 104 arranged relatively in a second direction, and an accommodating space. The first direction intersects with the second direction and is preferably arranged vertically, that is, the mainstream flow direction of the high-temperature working fluid forms an angle of 90° with the mainstream flow direction of the low-temperature working fluid.

[0044] The shell 100 forms an internal accommodation space, and the compressed Gyroid-type three-period minimal surface core 200 is arranged in the internal accommodation space of the shell 100, preferably in the area in the center of the internal space. A head is formed on the shell 100, and the head guides the working fluid to enter and exit the respective areas at the inlet and outlet positions of the low and high temperature working fluids, and is distinguished according to the installation position of the head, including a first head 105 and a second head 106.

[0045] like Figure 1 As shown, the side of the compressed Gyroid-type three-period minimal surface core 200 relative to the working fluid inlet and the working fluid outlet is sealed with the inner wall of the shell 100 by the contour edge. The side of the compressed Gyroid-type three-period minimal surface core 200 relative to the bottom surface of the shell 100 is sealed with the bottom surface, and the bottom surface can be understood as the two bottom surfaces of the shell 100, that is, two bottom surfaces that are oppositely arranged in the horizontal direction. It can be seen that the side of the compressed Gyroid-type three-period minimal surface core 200 relative to the working fluid inlet and the working fluid outlet is sealed with the inner wall of the shell 100 by the contour edge.

[0046] The first head 105 is arranged between the cryogenic medium inlet 101 and the core body, and between the core body and the cryogenic medium outlet 102. The core body is sealed with the inner wall of the shell 100 by its contour edge as described above, so that the internal space of the first head 105 forms a liquid collecting cavity and has sealing properties.

[0047] The second head 106 is arranged between the high-temperature working medium inlet 103 and the core body, and between the core body and the high-temperature working medium outlet 104. The core body is sealed with the inner wall of the shell 100 by its contour edge as described above, so that the internal space of the second head 106 forms a liquid collecting cavity and has sealing properties.

[0048] In a preferred embodiment, the head form in this embodiment adopts a gradually shrinking and expanding form. One end of the head is connected to the contour edge of the compressed Gyroid-type three-period minimal surface core 200, and the other end is connected to the working fluid inlet and outlet through the flange 107. A cavity is formed between the core and the working fluid inlet, and between the core and the working fluid outlet to collect liquid. The liquid collecting cavity adopts a gradually shrinking and expanding form. The specific change is that the circular inner diameter shape of the flange 107 is transformed into a quadrilateral corresponding to the surface of the core. The liquid collecting cavity is arranged at the inlet and outlet of the low and high temperature working fluids, and a length for the working fluid to fully develop is reserved. The inlet and outlet liquid collecting cavities are arranged at the working fluid inlet and outlet to ensure that the working fluid is fully developed before entering the core of the heat exchanger, eliminating the disadvantage of uneven flow distribution.

[0049] In the present invention, the first end cap 105 and the second end cap 106 are fixedly connected to the working fluid pipeline through the flange 107, which is used to connect the heat exchanger and the working fluid pipeline. In the preferred embodiment, the inner diameter of the flange 107 is the same as the inner diameter of the working fluid pipeline, and four bolt holes 1071 are respectively opened at the four equal parts of the flange 107 to provide installation positions for fastening bolts. The connecting flange 107 is combined with the liquid collecting chamber, and the purpose is to connect the heat exchanger to the high and low temperature working fluid system. The thickness of the connecting flange 107 meets the strength requirements, the size of the connecting flange 107 matches the size of the flange 107 of the working fluid pipeline system, and the positioning bolt hole 1071 is opened on the connecting flange 107, and the position of the bolt hole 1071 matches the position of the bolt hole 1071 of the flange 107 of the working fluid pipeline system. The connecting flange 107 is an important component for connecting the heat exchanger to the working fluid pipeline system. The bolt connection is fastened through the bolt hole 1071, and a polytetrafluoroethylene gasket is used to ensure that the heat exchanger liquid does not leak.

[0050] In this embodiment, the compressed Gyroid-type three-periodic minimal surface is a compressed structure along a certain direction generated by controlling the coefficients in the expression based on the Gyroid-type three-periodic minimal surface, and this direction can be any direction of the coordinate axes x, y, and z.

[0051] The compressed Gyroid type three-period minimal surface core 200, hereinafter referred to as the G-TPMS compressed core, serves as a primary surface to separate the high-temperature working fluid from the low-temperature working fluid, and the heat of the high-temperature working fluid is transferred to the low-temperature working fluid through the G-TPMS compressed core. The G-TPMS compressed core serves as both a spacing structure to separate the high-temperature working fluid from the low-temperature working fluid and a heat conduction structure for heat exchange. The TPMS structure has both structural and performance integration.

[0052] The surface of the G-TPMS compression core is molded with a low-temperature working fluid channel opening and a high-temperature working fluid channel opening, and the interior is molded with a low-temperature working fluid channel 201 and a high-temperature working fluid channel 202, which are used to separate the low and high-temperature working fluid domains 108, and separate the working fluid channels inside the G-TPMS compression core. It should be understood that the working fluid channel is an internal channel of the structure generated based on the molding of the G-TPMS compression core, and is determined by the basic control equation of the core.

[0053] The baffle includes a first baffle 203 and a second baffle 204, wherein the central channel opening and the channel openings arranged at intervals on both sides of the central channel opening among the channel openings formed on the surface of the core are the first channel opening; the adjacent channel openings on both sides of the central channel opening and the channel openings arranged at intervals on both sides of the adjacent channel openings are the second channel openings; the first channel opening is a channel opening of one type between a low-temperature working medium channel opening and a high-temperature working medium channel opening, and the second channel opening is a channel opening of another type between a low-temperature working medium channel opening and a high-temperature working medium channel opening; the first baffle 203 blocks the high-temperature working medium channel opening on the surface of the core in the first direction, so that the low-temperature working medium channel opening on the surface of the core in the first direction is open; the second baffle 204 blocks the low-temperature working medium channel opening on the surface of the core in the second direction, so that the high-temperature working medium channel opening on the surface of the core in the second direction is open. The baffle is arranged on the surface of the core to prevent low and high-temperature working medium from entering each other's flow channels at the working medium inlet and outlet. The edge of the baffle overlaps with the edge of the flow channel and has a certain thickness, preventing low and high temperature working fluids from entering the other flow channel. That is, the baffle is arranged on the same plane as the edge of the G-TPMS compression core, and the outer contour matches the shape of the flow channel inlet and outlet, ensuring that the inlet and outlet baffles can completely prevent heterogeneous working fluids from penetrating and crossing into the interior.

[0054] Therefore, the baffles of the working fluid inlet and outlet are set at the inlet and outlet positions of the high-temperature working fluid and the low-temperature working fluid. As mentioned above, for each surface of the core, there are channel openings for the cold and high-temperature working fluids at the same time. The baffle coincides with the edge of the core surface, blocking one of the channel openings, so that only one channel opening of the cold and high-temperature working fluids can be open on the core surface in one direction, so that the corresponding working fluid can enter the corresponding working fluid channel.

[0055] It can be seen that the present invention blocks different working fluid channel openings on the surface of the G-TPMS compression core in different directions with baffles, so that only one type of liquid is allowed to flow into the working fluid channel of the core in the corresponding direction in one direction. For example, the high-temperature working fluid channel opening on the surface of the G-TPMS compression core in the first direction is closed by a baffle, and only low-temperature working fluid is allowed to pass through in this direction. The low-temperature working fluid channel on the surface of the G-TPMS compression core in the second direction is closed by a baffle, and only high-temperature working fluid is allowed to pass through in this direction. The low- and high-temperature working fluid areas of the heat exchanger in this embodiment are isolated by baffles and channels to avoid cross-flow of fluids. In this embodiment, the baffle at the high-temperature working fluid channel opening prevents the high-temperature working fluid from entering the working fluid channel of the low-temperature working fluid, and the baffle at the low-temperature working fluid channel opening prevents the low-temperature working fluid from entering the working fluid channel of the high-temperature working fluid, so as to ensure that the working fluids are not mixed.

[0056] In this embodiment, the G-TPMS compression core is compressed from the G-TPMS structure, and the mathematical expression of the G-TPMS structure is:

[0057] sinXcosY+sinYcosZ+sinZcosX=c;

[0058] In the formula, X=2απx, Y=2βπy, Z=2γπz, where α, β, and γ are compression coefficients used to control the size of the lattice cells in the x, y, and z directions. If the structural compression in a single direction is controlled, it is necessary to change this directional coefficient under the premise that the other two coefficients are equal, so that this coefficient is greater than the other two coefficients. c is a constant used to control the porosity of the overall structure. When the minimal surface has no thickness, c=0.

[0059] In one embodiment, the value of the compression coefficient change should be an integer multiple of the constant value to control the structure to compress proportionally in the compression direction.

[0060] In one embodiment, the heat exchanger is 3D printed as a whole, and the heat exchanger is manufactured using the selective laser melting technology in the additive manufacturing method. In order to ensure the lightness of the heat exchanger, AlSi10Mg is selected as the material of the whole machine.

[0061] From the above, the G-TPMS compression core is an optimization based on the typical G-TPMS structure. It is the core structure of the TPMS heat exchanger. Its function is to separate the high-temperature working fluid from the low-temperature working fluid and transfer the heat of the high-temperature working fluid to the low-temperature working fluid. The heat exchange process achieved by its application is as follows:

[0062] The high-temperature working fluid is connected to the high-temperature working fluid system pipeline and the heat exchanger through the flange 107. After the high-temperature working fluid enters the second head 106 on the inlet side, it is fully collected. In the second direction, it enters the high-temperature working fluid channel 202 from the high-temperature working fluid channel opening on the inlet side surface of the compressed Gyroid type three-period minimal surface core 200, and then flows in the high-temperature working fluid channel of the tortuous compressed Gyroid type three-period minimal surface core 200, and flows out from the high-temperature working fluid channel opening on the outlet side surface of the compressed Gyroid type three-period minimal surface core 200. After flowing out of the high-temperature working fluid channel opening on the outlet side surface of the compressed Gyroid type three-period minimal surface core 200, the high-temperature working fluid reaches the second head 106 on the outflow side, and flows into the high-temperature working fluid system after passing through the flange 107 connected to the second head 106.

[0063] The cryogenic working fluid is connected to the cryogenic working fluid system pipeline and the heat exchanger through the flange 107. After the cryogenic working fluid enters the first head 105 on the inlet side, it is fully liquid-collected. In the first direction, it enters the cryogenic working fluid channel 201 from the low-temperature working fluid channel opening on the outlet side surface of the compressed Gyroid type three-period minimal surface core 200 and the low-temperature working fluid channel opening on the inlet side. Then, it flows in the low-temperature working fluid channel 201 of the tortuous compressed Gyroid type three-period minimal surface core 200, and flows out from the low-temperature working fluid channel opening on the outlet side surface of the compressed Gyroid type three-period minimal surface core 200. After flowing out of the compressed Gyroid type three-period minimal surface core 200, the cryogenic working fluid reaches the first head 105 on the outflow side, and flows into the cryogenic working fluid system after passing through the flange 107 connected to the first head 105.

[0064] Embodiment 1: Primary surface heat exchanger A1 has the structure of the primary surface heat exchanger A described above.

[0065] Among them, the basic control equation of the G-TPMS compression core is:

[0066] sinXcosY+sinYcosZ+sinZcosX=c;

[0067] In the formula, X = 2απx, Y = 2βπy, Z = 2γπz, where α = 2, β = 1, γ = 1, c = 0.438, compression in the x direction;

[0068] The low-temperature working fluid is water, the temperature is controlled at 30℃, and the speed is controlled at 0.08-0.14m / s; the high-temperature working fluid is high-temperature heat transfer oil, the high-temperature working fluid inlet temperature is controlled at 80℃, and the speed is controlled at 0.0275-0.06m / s. The minimum wall thickness is 0.5mm, the length of the core in the x, y, and z directions is 60mm, 50mm, and 40mm respectively, and the overall size is 126mm×116mm×42mm.

[0069] Embodiment 2: A primary surface heat exchanger A2 having the structure of the primary surface heat exchanger A described above;

[0070] Among them, the basic control equation of the G-TPMS compression core is:

[0071] sinXcosY+sinYcosZ+sinZcosX=c;

[0072] In the formula, X=2απx, Y=2βπy, Z=2γπz, where α=1, β=2, γ=1, c=0.438, compression in the y direction;

[0073] The low-temperature working fluid is water, the temperature is controlled at 30℃, and the speed is controlled at 0.08-0.14m / s; the high-temperature working fluid is high-temperature heat transfer oil, the high-temperature working fluid inlet temperature is controlled at 80℃, and the speed is controlled at 0.0275-0.06m / s. The minimum wall thickness is 0.5mm, the length of the core in the x, y, and z directions is 60mm, 50mm, and 40mm respectively, and the overall size is 126mm×116mm×42mm.

[0074] Embodiment 3: A primary surface heat exchanger A3 having the structure of the primary surface heat exchanger A described above;

[0075] Among them, the basic control equation of the G-TPMS compression core is:

[0076] sinXcosY+sinYcosZ+sinZcosX=c;

[0077] In the formula, X = 2απx, Y = 2βπy, Z = 2γπz, where α = 1, β = 1, γ = 2, c = 0.438, compression in the z direction;

[0078] The low-temperature working fluid is water, the temperature is controlled at 30℃, and the speed is controlled at 0.08-0.14m / s; the high-temperature working fluid is high-temperature heat transfer oil, the high-temperature working fluid inlet temperature is controlled at 80℃, and the speed is controlled at 0.0275-0.06m / s. The minimum wall thickness is 0.5mm, the length of the core in the x, y, and z directions is 60mm, 50mm, and 40mm respectively, and the overall size is 126mm×116mm×42mm.

[0079] Comparative Example 1: primary surface heat exchanger D1, which differs from the primary surface heat exchanger A in structure in that it has an uncompressed, typical Gyroid-type three-period minimal surface core;

[0080] Among them, the basic control equation of the G-TPMS core is:

[0081] sinXcosY+sinYcosZ+sinZcosX=c;

[0082] In the formula, X=2απx, Y=2βπy, Z=2γπz, where α=1, β=1, γ=1, uncompressed;

[0083] The low-temperature working fluid is water, the temperature is controlled at 30℃, and the speed is controlled at 0.08-0.14m / s; the high-temperature working fluid is high-temperature heat transfer oil, the high-temperature working fluid inlet temperature is controlled at 80℃, and the speed is controlled at 0.0275-0.06m / s. The minimum wall thickness is 0.5mm, the length of the core in the x, y, and z directions is 60mm, 50mm, and 40mm respectively, and the overall size is 126mm×116mm×42mm.

[0084] Experimental description:

[0085] The pressure drop is closely related to the flow rate of the working fluid. An increase in the flow rate will lead to an increase in the pressure drop, but at the same time it will also increase the disturbance between the working fluid and the heat exchange surface, thereby improving the heat exchange efficiency.

[0086] The heat transfer of a heat exchanger refers to the amount of heat transferred from a high-temperature working medium to a low-temperature working medium in the heat exchanger. It is one of the important indicators for measuring the performance of a heat exchanger. Since the heat transfer of a heat exchanger is the amount of heat transferred from a high-temperature working medium to a low-temperature working medium, it is sufficient to calculate the heat transfer of only one of the working mediums.

[0087] Table 1 shows the simulation results of the pressure drop of the heat exchange module of the Gyroid type TPMS, the x-direction compression Gyroid type TPMS, the y-direction compression Gyroid type TPMS, and the z-direction compression Gyroid type TPMS.

[0088] The pressure drop ratio of the current flow rate = (pressure drop of a certain compressed Gyroid - pressure drop of the original Gyroid / pressure drop of the original Gyroid) × 100%.

[0089] Average pressure drop ratio = sum of pressure drop ratios of each flow rate condition / number of flow rate conditions.

[0090] Table 2 shows the heat transfer simulation results of the heat exchange modules of the Gyroid TPMS, the x-direction compressed Gyroid TPMS, the y-direction compressed Gyroid TPMS, and the z-direction compressed Gyroid TPMS.

[0091] The heat transfer rate increase ratio of the current flow rate = (heat transfer rate of a certain compressed Gyroid - heat transfer rate of the original Gyroid / heat transfer rate of the original Gyroid) × 100%.

[0092] Average increase ratio of heat exchange rate = sum of increase ratios of heat exchange rate under each flow rate condition / number of flow rate conditions.

[0093]

[0094]

[0095] From Table 1-2, Figure 5-6 It can be seen that compared with the primary surface heat exchanger D1 of Comparative Example 1 without a compressed core:

[0096] The spanwise pressure drop of the primary surface heat exchanger A1 with the core compressed along the x direction decreased. At the same speed, the average pressure drop of the low-temperature working fluid decreased by 15.267%; the average pressure drop of the high-temperature working fluid decreased by 265.713%.

[0097] The spanwise pressure drop of the primary surface heat exchanger A2 with the core compressed along the y direction decreased, with the average pressure drop ratio of the low-temperature working fluid being 412.094%; the average pressure drop ratio of the high-temperature working fluid being 25.657%.

[0098] The spanwise pressure drop of the primary surface heat exchanger A3 with a compressed core along the z direction decreased, with the average pressure drop ratio of the low-temperature working fluid being 16.621%; the average pressure drop ratio of the high-temperature working fluid being 16.613%.

[0099] Compared with the primary surface heat exchanger D1 of Comparative Example 1 without compressed core:

[0100] The average increase rate of heat transfer of the primary surface heat exchanger A1 with the core compressed along the x direction is 52.964%.

[0101] The average increase rate of heat transfer of the primary surface heat exchanger A2 with the core compressed along the y direction is 26.227%.

[0102] The average increase rate of heat transfer of the primary surface heat exchanger A3 with the core compressed along the z direction is 29.278%.

[0103] Therefore, compared with the primary surface heat exchanger D1 of the comparative example 1 without compressed core, the primary surface heat exchanger A1 with compressed core along the x direction has the highest average pressure drop reduction ratio for high temperature working fluid and the highest average increase ratio for heat exchange. The average pressure drop reduction ratio and the average increase ratio for heat exchange have the same effect.

[0104] The heat exchangers A1, A2, and A3 that compress the core along the x, y, and z directions have different effects on the average pressure drop reduction ratio of the low-temperature working fluid and the average increase ratio of the heat exchange rate. For example, the heat exchanger A2 that compresses the core along the y direction has the highest average pressure drop reduction ratio of the low-temperature medium, but the average increase ratio of the heat exchange rate is in the middle.

[0105] The heat exchangers A2 and A3 that compress the core along the y and z directions have different effects on the average pressure drop reduction ratio of high-temperature working fluid and the average increase ratio of heat exchange rate. For example, the heat exchanger A2 that compresses the core along the y direction has a medium average pressure drop reduction ratio of high-temperature working fluid, but the average increase ratio of heat exchange rate is the lowest.

[0106] It can be seen that the primary surface heat exchanger A1 of the present invention, which compresses the core along the x direction, has the highest average pressure drop reduction ratio and the highest average heat exchange rate increase ratio for high-temperature working fluids, with α=2, β=1, γ=1, and c=0.438. The average pressure drop reduction ratio and the average heat exchange rate increase ratio have the same effect, that is, the synchronous improvement of the pressure drop and the heat exchange effect is achieved, and the effect is optimal.

[0107] The invention discloses a Gyroid type three-periodic minimal surface (G-TPMS) primary surface heat exchanger based on a compression method, belonging to the technical field of heat exchangers. The heat exchanger is based on a G-TPMS structure, and structural compression is performed in three directions, namely, x, y and z.

[0108] Compared with the typical G-TPMS structure, under the same porosity, the G-TPMS compression structure can reduce the wall thickness and increase the specific surface area. In terms of cross-section, it can also reduce the amplitude of the TPMS structure.

[0109] The G-TPMS heat exchanger has advantages over both TPMS heat exchangers and traditional heat exchangers. The G-TPMS primary surface heat exchanger based on the compression method is a re-optimization based on the G-TPMS primary surface heat exchanger. The above-mentioned simulation and experimental methods of the present invention jointly reveal the performance improvement degree and internal mechanism of the compression method for optimizing the G-TPMS heat exchanger.

[0110] The present invention is an exploration of the new situation of TPMS heat exchangers, and provides technical support for solving the lightweight heat exchange needs in the petrochemical field. In the context of petrochemical oil cooling, the present invention can greatly increase the heat exchange area, reduce the spanwise pressure drop, and improve the overall heat exchange capacity, effectively ensuring drag reduction and efficiency improvement.

[0111] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0112] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0113] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0114] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0115] In the present invention, the term "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previously associated objects are in an "or" relationship. "At least one" means one or more; "at least one of A and B" is similar to "A and / or B", describing the association relationship of associated objects, indicating that three relationships may exist. For example, at least one of A and B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0116] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0117] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A Gyroid type three-period minimal surface primary surface heat exchanger based on a compression method, characterized in that: include: A shell (100), the shell (100) being formed with a low-temperature working medium inlet (101) and a low-temperature working medium outlet (102) arranged opposite to each other in a first direction, a high-temperature working medium inlet (103) and a high-temperature working medium outlet (104) arranged opposite to each other in a second direction, and an accommodating space, wherein the first direction intersects with the second direction; A compressed Gyroid-type three-period minimal curved surface core (200) is arranged in the accommodating space and is formed by compression of the Gyroid-type three-period minimal curved surface core in any coordinate axis direction; a low-temperature working fluid channel opening and a high-temperature working fluid channel opening are formed on the surface of the compressed Gyroid-type three-period minimal curved surface core (200), and a low-temperature working fluid channel (201) and a high-temperature working fluid channel (202) are formed inside the core; The basic governing equation of the Gyroid-type three-periodic minimal surface core is: sinXcosY+sinYcosZ+sinZcosX=c Wherein, X=2απx, Y=2βπy, Z=2γπz, where x, y and z are the coordinates of the x-axis, y-axis and z-axis of the spatial rectangular coordinate system established by the lattice cell, α, β, γ are coefficients used to control the size of the lattice cell in the respective corresponding x-axis, y-axis and z-axis directions, and c is a constant used to control the porosity of the overall structure; The compressed Gyroid-type three-period minimal surface core (200) is obtained by compressing the Gyroid-type three-period minimal surface core (200) in a single coordinate axis direction, wherein the compression is to adjust the coefficient of the size of the lattice cell in the single coordinate axis direction to be greater than the coefficients of the size of the lattice cell in the other two coordinate axis directions, and the coefficients of the size of the lattice cell in the other two coordinate axis directions are equal; The compression direction is the x-axis direction, α=2, β=1, γ=1, and c=0.

438.

2. The Gyroid type three-period minimal surface primary surface heat exchanger based on the compression method according to claim 1, characterized in that: The coefficient of the size of the lattice cell in the direction of the single coordinate axis is an integer multiple of the coefficients of the sizes of the lattice cells in the directions of the other two coordinate axes.

3. The Gyroid type three-period minimal surface primary surface heat exchanger based on the compression method according to any one of claims 1-2, characterized in that: It also includes a first baffle (203) and a second baffle (204); Among the channel openings formed on the surface of the core body, the central channel opening and the channel openings arranged at intervals on both sides of the central channel opening are first channel openings; The adjacent channel openings on both sides of the central channel opening, and the channel openings arranged at intervals on both sides of the adjacent channel openings are second channel openings; The first channel opening is a channel opening of one type among a low-temperature working medium channel opening and a high-temperature working medium channel opening, and the second channel opening is a channel opening of another type among a low-temperature working medium channel opening and a high-temperature working medium channel opening; The first baffle (203) blocks the high-temperature working medium passage opening on the surface of the core in the first direction, leaving the low-temperature working medium passage opening on the surface of the core in the first direction open; The second baffle (204) blocks the low-temperature working medium channel opening on the surface of the core in the second direction, leaving the high-temperature working medium channel opening on the surface of the core in the second direction open.

4. The Gyroid type three-period minimal surface primary surface heat exchanger based on the compression method according to any one of claims 1-2, characterized in that: Also includes: A first end cap (105) is formed on the shell (100), and is arranged between the cryogenic medium inlet (101) and the core body, and between the core body and the cryogenic medium outlet (102), so that the internal space of the first end cap (105) forms a liquid collecting cavity; The second head (106) is formed on the shell (100), and is arranged between the high-temperature working medium inlet (103) and the core body, and between the core body and the high-temperature working medium outlet (104), so that the internal space of the second head (106) forms a liquid collecting cavity.

5. The Gyroid type three-period minimal surface primary surface heat exchanger based on the compression method according to claim 4, characterized in that: Also includes: The flange (107) is used to fixedly connect the first end cap (105), the second end cap (106) and the working fluid pipeline.

6. The Gyroid type three-period minimal surface primary surface heat exchanger based on the compression method according to any one of claims 1-2, characterized in that: The side of the compressed Gyroid-type three-period minimal surface core (200) opposite to the working fluid inlet and the working fluid outlet is sealed to the inner wall of the shell (100) with a contour edge, and the side of the compressed Gyroid-type three-period minimal surface core (200) opposite to the bottom surface of the shell (100) is sealed to the bottom surface.

7. The Gyroid type three-period minimal surface primary surface heat exchanger based on the compression method according to any one of claims 1-2, characterized in that: The first direction and the second direction are perpendicular to each other.

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