Device and method for measuring heat transfer performance of 3D printing metal dot matrix

Abstract

The invention discloses a device and a method for measuring the heat transfer performance of a 3D printing metal dot matrix. The device comprises bottom heat insulation cotton; a heat insulation ceramic block and a bottom fixing frame are arranged on the bottom heat insulation cotton, and the bottom fixing frame surrounds the periphery of the heat insulation ceramic block; a heating sheet is arranged on the heat insulation ceramic block; a dot matrix sample is arranged on the heating plate; a refrigeration sheet is arranged on the lattice sample; a water cooling plate is arranged on the refrigeration sheet; the water cooling plate is connected with two water cooling pipes; one end of the thermocouple is connected with the lattice sample, and the other end is connected with the temperature tester; the side heat insulation cotton wraps three side surfaces around the dot matrix sample; the circulating water motor and the ice bag are arranged in the ice water tank, and the ice water tank and the circulating water motor are connected with the two water cooling pipes respectively; and the heating sheet and the refrigerating sheet are connected with a direct-current power supply. According to the invention, the heat conduction performance of the lattice-filled 3D printing structural member in the space environment can be accurately tested, and the accuracy of the thermal performance test of the structure can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printed part performance testing, and in particular to a device and method for measuring the heat transfer performance of a 3D printed metal lattice. Background Art

[0002] Metal 3D printed lattice structures have a low strength-to-mass ratio, so they are increasingly used in the aerospace field. However, there is also a problem, that is, under the conditions of compact space and a large number of high-heat-generating units assembled, it is difficult for lattice-filled 3D printed structural parts to dissipate heat. Compared with solid metal parts, lattice-filled structural parts have low heat dissipation efficiency, resulting in high local temperatures in aviation / aerospace electronic devices, which significantly affects the effective service time of electronic devices and even causes the devices to burn out in a short time. Therefore, the overall design should consider the impact of the heat transfer performance of the lattice on the thermal management of the entire machine, and accurately evaluate the heat dissipation of lattice-filled 3D printed structural parts during service.

[0003] At present, there is no standard for the test method of thermal performance of 3D printed structural parts filled with lattice, and accurate evaluation of the heat transfer performance of the lattice is an important requirement for aerospace structural parts. Aerospace devices are used in outer space, surrounded by a vacuum environment. There is no air in contact with the outer surface of the structure, so there is no heat convection. Heat is mainly dissipated in the form of thermal radiation, and it is difficult to create a vacuum environment during ground simulation. How to more accurately simulate the space environment has become a problem to be studied. The present invention proposes a thermal performance test method for lattice structural parts suitable for space service environment, which can more accurately measure the heat transfer performance of the lattice in a space environment. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for measuring the heat transfer performance of a 3D printed metal lattice in view of the shortcomings of the prior art. The present invention can solve the problem that the existing heat conduction measurement method cannot accurately measure the heat transfer performance of the lattice structure.

[0005] The objective of the present invention is achieved through the following technical solutions: In a first aspect, an embodiment of the present invention provides a device for measuring the heat transfer performance of a 3D printed metal lattice, comprising: The main body includes bottom thermal insulation cotton, thermal insulation ceramic block, heating plate, lattice sample, cooling plate, water-cooling plate, thermocouple, two water-cooling pipes, side thermal insulation cotton and bottom fixing frame, wherein the bottom thermal insulation cotton is provided with thermal insulation ceramic block and bottom fixing frame, and the bottom fixing frame surrounds the thermal insulation ceramic block, the thermal insulation ceramic block is provided with heating plate, the heating plate is provided with lattice sample, the lattice sample is provided with cooling plate, the cooling plate is provided with water-cooling plate, the water-cooling plate is connected to one end of two water-cooling pipes; one end of the thermocouple is connected to the lattice sample; the side thermal insulation cotton is wrapped around three sides around the lattice sample; A measuring module, comprising a temperature tester, wherein the temperature tester is connected to the other end of the thermocouple; A cooling module, comprising an ice water tank and a circulating water motor and an ice bag arranged in the ice water tank, wherein the ice water tank is connected to the other end of a water cooling pipe, and the circulating water motor is connected to the other end of another water cooling pipe; and The power supply module comprises a DC power supply, and the heating plate and the cooling plate are both connected to the DC power supply.

[0006] Furthermore, the thickness of the bottom heat insulation cotton is 10mm~15mm; The length and width of the bottom heat insulation cotton are 1.5 to 2.5 times the outline size of the bottom fixing frame; The height of the bottom fixing frame is 1 to 1.5 times the height of the thermal insulation ceramic block.

[0007] Further, the lattice sample comprises a lower end continuous block, a middle lattice block and an upper end continuous block, and the middle lattice block is arranged between the lower end continuous block and the upper end continuous block; The lower continuous block is provided with a first temperature detection hole and a second temperature detection hole, the second temperature detection hole is provided at the geometric center of the lower continuous block, the first temperature detection hole is provided at the right edge of the lower continuous block, the distance between the first temperature detection hole and the right edge of the lower continuous block is 1 / 4 to 1 / 5 of the horizontal length of the lower continuous block, and the first temperature detection hole and the second temperature detection hole are located at the same height; The intermediate lattice block includes a plurality of unit cells; The upper continuous block is provided with a third temperature detection hole and a fourth temperature detection hole, the fourth temperature detection hole is arranged at the geometric center position of the upper continuous block, the third temperature detection hole is arranged at the right edge position of the upper continuous block, the distance between the third temperature detection hole and the right edge of the upper continuous block is 1 / 4 to 1 / 5 of the horizontal length of the upper continuous block, and the third temperature detection hole and the fourth temperature detection hole are located at the same height position.

[0008] Furthermore, the height of the middle dot matrix block is twice the sum of the heights of the lower continuous block and the upper continuous block.

[0009] Furthermore, when preparing the lattice sample, if the number of unit cells in any direction is less than 3, different lattice samples need to be prepared according to the different cross sections of the unit cells on the boundary.

[0010] Furthermore, the length of the cooling plate is 1 to 1.5 times the length of the upper continuous block, and the width of the cooling plate is 1 to 1.5 times the width of the upper continuous block; The length of the water cooling plate is 1 to 1.5 times the length of the cooling fin, and the width of the water cooling plate is 1 to 1.5 times the width of the cooling fin; The length of the water-cooling plate is 1.5 to 2.5 times the length of the upper continuous block, and the width of the water-cooling plate is 1.5 to 2.5 times the width of the upper continuous block.

[0011] Further, the thermocouple includes a first thermocouple, a second thermocouple, a third thermocouple and a fourth thermocouple, wherein one end of the first thermocouple is connected to the fourth temperature detection hole, one end of the second thermocouple is connected to the third temperature detection hole, and the other ends of the first thermocouple and the second thermocouple are connected to the temperature tester for measuring the temperature of the upper heat output end; one end of the third thermocouple is connected to the second temperature detection hole, one end of the fourth thermocouple is connected to the first temperature detection hole, and the other ends of the third thermocouple and the fourth thermocouple are connected to the temperature tester for measuring the temperature of the lower heat input end.

[0012] Furthermore, ice bags are placed in the circulating water of the ice water tank so that the temperature of the cooling water output by the ice water tank is 0°C; the proportion of the ice bags in the ice water tank is 45% to 55%.

[0013] Further, the heating plate is provided with a first heating port and a second heating port; the cooling plate is provided with a first cooling port and a second cooling port; The DC power supply is provided with multiple power channels, wherein the positive and negative poles of one power channel are respectively connected to the first heating port and the second heating port, so that the DC power supply can power the heating plate; the positive and negative poles of one power channel are respectively connected to the first cooling port and the second cooling port, so that the DC power supply can power the cooling plate.

[0014] A second aspect of an embodiment of the present invention provides a method for measuring the heat transfer performance of the above-mentioned 3D printed metal lattice, comprising the following steps: S1. Put half the volume of water and an ice bag filled with ice into an ice water tank to prepare a coolant; S2. Connect one of the two water-cooling pipes to the circulating water motor and the other to the ice water tank, and power on the circulating water motor to start working; S3, connecting the heating plate and the cooling plate to a DC power supply, and energizing the heating plate and the cooling plate; S4, inserting the first thermocouple into the fourth temperature detection hole, inserting the second thermocouple into the third temperature detection hole, inserting the third thermocouple into the second temperature detection hole, inserting the fourth thermocouple into the first temperature detection hole, connecting the other ends of the first thermocouple, the second thermocouple, the third thermocouple and the fourth thermocouple to a temperature tester, and measuring their temperatures using the temperature tester; S5, recording the voltage and current of the DC power supply and the temperature values ​​of the second thermocouple and the fourth thermocouple; S6, after the temperature values ​​of the second thermocouple and the fourth thermocouple tend to be stable, stop recording the temperature values ​​of the second thermocouple and the fourth thermocouple, and record the heating time t; S7, remove the heating plate and the side insulation cotton, keep the cooling plate and the circulating water motor powered on, and use a temperature tester to measure the temperature value of the fourth thermocouple; S8, after the temperature value of the fourth thermocouple returns to room temperature, i.e., 10-30°C, reinstall the heating plate and the side insulation cotton, and continue to power on the heating plate. During the heating time t, record the temperature-time curves of the third thermocouple and the fourth thermocouple; S9, after the temperature values ​​of the third thermocouple and the fourth thermocouple tend to be stable, stop recording the temperature values ​​of the third thermocouple and the fourth thermocouple, and record the heating time t; S10, repeating steps S7-S8, recording the temperature-time curves of the first thermocouple and the second thermocouple; S11, plotting a power-time curve and a temperature-time curve of the first thermocouple, the second thermocouple, the third thermocouple, and the fourth thermocouple.

[0015] The beneficial effects of the present invention are as follows: the present invention can more accurately test the thermal conductivity of 3D printed structural parts filled with dot matrix in a space environment; and by measuring with the device described in the present invention, the accuracy of the structural thermal performance test can be improved by 30%. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the device for measuring the heat transfer performance of a 3D printed metal lattice according to the present invention; Figure 2 It is a three-dimensional structural schematic diagram of the main part of the present invention; Figure 3 It is a bottom-up structural schematic diagram of the main body of the present invention; Figure 4 It is a schematic diagram of the structure of the lattice sample, the heating plate, the cooling plate and the thermocouple in the main part of the present invention; Figure 5 It is a schematic structural diagram of the heat insulation and fixing parts in the main body of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the cooling module of the present invention.

[0017] In the figure, bottom thermal insulation cotton 1, thermal insulation ceramic block 2, heating plate 3, first heating port 3-1, second heating port 3-2, lattice sample 4, lower end continuous block 4-1, first temperature detection hole 4-1-1, second temperature detection hole 4-1-2, middle lattice block 4-2, unit cell 4-2-1, upper end continuous block 4-3, third temperature detection hole 4-3-1, fourth temperature detection hole 4-3-2, refrigeration plate 5, first refrigeration port 5-1, second refrigeration port 5-2, water cooling plate 6, thermocouple 7, first thermocouple 7-1, second thermocouple 7-2, third thermocouple 7-3, fourth thermocouple 7-4, temperature tester 8, water cooling pipe 9, ice water tank 10, circulating water motor 11, ice bag 12, DC power supply 13, power supply channel 13-1, side thermal insulation cotton 14, bottom fixing frame 15. DETAILED DESCRIPTION

[0018] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0019] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the" and "the" used in the present invention and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0020] It should be understood that although the terms first, second, third, etc. may be used in the present invention to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0021] The present invention is described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0022] like Figure 1-Figure 6 As shown, the measuring device of the heat transfer performance of 3D printed metal lattice of the present invention specifically includes a main body, a measuring module, a cooling module and a power module. Among them, the main body includes a bottom insulation cotton 1, an insulation ceramic block 2, a heating plate 3, a lattice sample 4, a cooling plate 5, a water-cooling plate 6, a thermocouple 7, two water-cooling pipes 9, a side insulation cotton 14 and a bottom fixing frame 15, the bottom insulation cotton 1 is provided with an insulation ceramic block 2 and a bottom fixing frame 15, and the bottom fixing frame 15 surrounds the insulation ceramic block 2, the insulation ceramic block 2 is provided with a heating plate 3, the heating plate 3 is provided with a lattice sample 4, the lattice sample 4 is provided with a cooling plate 5, and the cooling plate 5 is provided with a water-cooling plate 6, the water-cooling plate 6 is connected to one end of the two water-cooling pipes 9; one end of the thermocouple 7 is connected to the lattice sample 4; the side insulation cotton 14 is wrapped around the three sides around the lattice sample 4. The measuring module includes a temperature tester 8, and the temperature tester 8 is connected to the other end of the thermocouple 7. The cooling module includes an ice water tank 10 and a circulating water motor 11 and an ice bag 12 arranged in the ice water tank 10. Figure 1 and Figure 6 As shown, the ice water tank 10 is connected to the other end of a water cooling pipe 9, and the circulating water motor 11 is connected to the other end of another water cooling pipe 9. The power module includes a DC power supply 13, and the heating plate 3 and the cooling plate 5 are both connected to the DC power supply 13.

[0023] It should be noted that the main body includes two water cooling pipes 9, one of which is used as a water inlet pipe, and its two ends are respectively connected to the water inlet of the water cooling plate 6 and the circulating water motor 11; the other water cooling pipe 9 is used as a water outlet pipe, and its two ends are respectively connected to the water outlet of the water cooling plate 6 and the ice water tank 10. When the circulating water motor 11 is powered on, it absorbs water from the ice water tank 10 and sends it to the water inlet pipe, and the cooling water is transported to the water cooling plate 6 through the water inlet pipe. After the cooling water circulates in the water cooling plate 6, it is discharged through the drain pipe and recycled to the ice water tank 10, so that circulating water can be formed.

[0024] Furthermore, the thickness of the bottom heat insulation cotton 1 is 10 mm to 15 mm.

[0025] Furthermore, since the thermal insulation ceramic block 2 is arranged at the bottom of the lattice sample 4, and the bottom thermal insulation cotton 1 is arranged at the bottom of the thermal insulation ceramic block 2, the length and width of the bottom thermal insulation cotton 1 should not be less than the length and width of the thermal insulation ceramic block 2 placed thereon. In addition, the bottom fixing frame 15 is arranged on the bottom thermal insulation cotton 1, and the thermal insulation ceramic block 2 is located in the bottom fixing frame 15. Figure 5 Therefore, in this embodiment, the length and width of the bottom heat insulation cotton 1 are 1.5 to 2.5 times the outline size of the bottom fixing frame 15, and the height of the bottom fixing frame 15 is 1 to 1.5 times the height of the heat insulation ceramic block 2.

[0026] Furthermore, aerogel is evenly coated between the thermal insulation ceramic block 2 and the lattice sample 4 .

[0027] In this embodiment, the dot matrix sample 4 includes a lower continuous block 4-1, an intermediate dot matrix block 4-2 and an upper continuous block 4-3, and the intermediate dot matrix block 4-2 is arranged between the lower continuous block 4-1 and the upper continuous block 4-3. Figure 1 and Figure 2 As shown. The lower continuous block 4-1 is provided with a first temperature detection hole 4-1-1 and a second temperature detection hole 4-1-2. The second temperature detection hole 4-1-2 is provided at the geometric center of the lower continuous block 4-1. The first temperature detection hole 4-1-1 is provided at the right edge of the lower continuous block 4-1. The distance between the first temperature detection hole 4-1-1 and the right edge of the lower continuous block 4-1 is 1 / 4 to 1 / 5 of the horizontal length of the lower continuous block 4-1. The first temperature detection hole 4-1-1 and the second temperature detection hole 4-1-2 are located at the same height. Figure 3 The middle lattice block 4-2 includes a plurality of unit cells 4-2-1, such as Figure 2As shown, the unit cell 4-2-1 is the smallest unit constituting the middle dot matrix block 4-2. The upper continuous block 4-3 is provided with a third temperature detection hole 4-3-1 and a fourth temperature detection hole 4-3-2. The fourth temperature detection hole 4-3-2 is provided at the geometric center of the upper continuous block 4-3. The third temperature detection hole 4-3-1 is provided at the right edge of the upper continuous block 4-3. The distance between the third temperature detection hole 4-3-1 and the right edge of the upper continuous block 4-3 is 1 / 4 to 1 / 5 of the horizontal length of the upper continuous block 4-3. The third temperature detection hole 4-3-1 and the fourth temperature detection hole 4-3-2 are located at the same height position. Figure 3 The temperature calculation of the lower heat input end is the average temperature of the first temperature detection hole 4-1-1 and the second temperature detection hole 4-1-2, and the temperature calculation of the upper heat output end is the average temperature of the third temperature detection hole 4-3-1 and the fourth temperature detection hole 4-3-2, wherein the temperature of each temperature detection hole is measured by a thermocouple 7.

[0028] Furthermore, the height of the middle dot matrix block 4-2 is twice the sum of the heights of the lower continuous block 4-1 and the upper continuous block 4-3.

[0029] Furthermore, when preparing the lattice sample 4, if the number of unit cells 4-2-1 in any direction is less than 3, different lattice samples 4 need to be prepared according to the different cross sections of the unit cells 4-2-1 on the boundary.

[0030] It should be understood that if the number of unit cells 4-2-1 is small enough, different boundary interceptions may affect the overall performance, but if the number of unit cells 4-2-1 is large enough, then the interception of the boundaries at both ends has little effect on the overall performance, and there is no need to prepare a lattice sample 4 with different interface interceptions. The lattice of the middle lattice block 4-2 can be set as a 2D or 3D lattice, and the measurement method described in the present invention is applicable to different types of lattices.

[0031] Specifically, when the number of unit cells 4-2-1 in a certain direction is less than 3, three lattice samples 4 of unit cells 4-2-1 with different boundaries should be prepared, and then the average heat transfer of these three lattice samples 4 should be measured, and the average heat transfer value is used as the final heat transfer result of this group of lattice samples 4. Among them, the phase difference of these three lattice samples 4 should be close to 1 / 3l, where l is the side length of the unit cell.

[0032] Furthermore, the length of the cooling fin 5 is 1 to 1.5 times the length of the upper continuous block 4 - 3 , and the width of the cooling fin 5 is 1 to 1.5 times the width of the upper continuous block 4 - 3 .

[0033] Furthermore, the length of the water-cooling plate 6 is 1 to 1.5 times the length of the cooling fin 5 , and the width of the water-cooling plate 6 is 1 to 1.5 times the width of the cooling fin 5 .

[0034] Furthermore, the length of the water-cooling plate 6 is 1.5 to 2.5 times the length of the upper continuous block 4 - 3 , and the width of the water-cooling plate 6 is 1.5 to 2.5 times the width of the upper continuous block 4 - 3 .

[0035] Further, the thermocouple 7 includes a first thermocouple 7-1, a second thermocouple 7-2, a third thermocouple 7-3 and a fourth thermocouple 7-4, such as Figure 1 As shown, one end of the first thermocouple 7-1 is connected to the fourth temperature detection hole 4-3-2, one end of the second thermocouple 7-2 is connected to the third temperature detection hole 4-3-1, and the other ends of the first thermocouple 7-1 and the second thermocouple 7-2 are connected to the temperature tester 8 for measuring the temperatures of the first thermocouple 7-1 and the second thermocouple 7-2, and the average temperature of the first thermocouple 7-1 and the second thermocouple 7-2 is used as the temperature of the upper heat output end; one end of the third thermocouple 7-3 is connected to the second temperature detection hole 4-1-2, one end of the fourth thermocouple 7-4 is connected to the first temperature detection hole 4-1-1, and the other ends of the third thermocouple 7-3 and the fourth thermocouple 7-4 are connected to the temperature tester 8 for measuring the temperatures of the third thermocouple 7-3 and the fourth thermocouple 7-4, and the average temperature of the third thermocouple 7-3 and the fourth thermocouple 7-4 is used as the temperature of the lower heat input end.

[0036] Furthermore, an ice pack 12 is placed in the circulating water of the ice water tank 10 so that the temperature of the cooling water output by the ice water tank 10 is around 0°C; the ice pack 12 accounts for 45% to 55% of the ice water tank 10, and the length, width and height of the ice pack 12 are within the range of 30 to 50 mm. Figure 6 shown.

[0037] Furthermore, if Figure 4 As shown, the heating plate 3 is provided with a first heating port 3-1 and a second heating port 3-2; the cooling plate 5 is provided with a first cooling port 5-1 and a second cooling port 5-2. The DC power supply 13 is provided with a plurality of power supply channels 13-1, such as Figure 1 As shown, the positive and negative electrodes of one power channel 13-1 are respectively connected to the first heating port 3-1 and the second heating port 3-2, so that the DC power supply 13 can supply power to the heating plate 3; the positive and negative electrodes of one power channel 13-1 are respectively connected to the first cooling port 5-1 and the second cooling port 5-2, so that the DC power supply 13 can supply power to the cooling plate 5; that is, the DC power supply 13 has a multi-channel function, and the voltage is applied according to the device characteristics of the heating plate 3 and the cooling plate 5, and the voltage should be less than or equal to 36V.

[0038] It is worth mentioning that the embodiment of the present invention also provides a method for measuring the heat transfer performance of the 3D printed metal lattice used in the above embodiment, which specifically includes the following steps: S1. Put half the volume of water and an ice bag 12 filled with ice into an ice water tank 10 to prepare a low-temperature coolant.

[0039] S2. Connect one of the two water-cooling pipes 9 to the circulating water motor 11, and the other to the ice water tank 10, and power on the circulating water motor 11 to start.

[0040] S3, connecting the heating plate 3 and the cooling plate 5 to the DC power supply 13, and energizing the heating plate 3 and the cooling plate 5.

[0041] S4. Insert the first thermocouple 7-1 into the fourth temperature detection hole 4-3-2, insert the second thermocouple 7-2 into the third temperature detection hole 4-3-1, insert the third thermocouple 7-3 into the second temperature detection hole 4-1-2, insert the fourth thermocouple 7-4 into the first temperature detection hole 4-1-1, connect the other ends of the first thermocouple 7-1, the second thermocouple 7-2, the third thermocouple 7-3 and the fourth thermocouple 7-4 to the temperature tester 8, and use the temperature tester 8 to measure their temperatures.

[0042] S5. Record the voltage and current of the DC power supply 13 and the temperature values ​​of the second thermocouple 7-2 and the fourth thermocouple 7-4.

[0043] S6. After the temperature values ​​of the second thermocouple 7-2 and the fourth thermocouple 7-4 tend to be stable, stop recording the temperature values ​​of the second thermocouple 7-2 and the fourth thermocouple 7-4, and record the heating time t.

[0044] S7. Remove the heating plate 3 and the side insulation cotton 14, keep the refrigeration plate 5 and the circulating water motor 11 powered on, and use the temperature tester 8 to measure the temperature value of the fourth thermocouple 7-4.

[0045] S8. After the temperature value of the fourth thermocouple 7-4 returns to room temperature, i.e., 10-30°C, reinstall the heating plate 3 and the side insulation cotton 14, and continue to power on the heating plate 3. During the heating time t, record the temperature-time curves of the third thermocouple 7-3 and the fourth thermocouple 7-4.

[0046] S9, after the temperature values ​​of the third thermocouple 7-3 and the fourth thermocouple 7-4 tend to be stable, stop recording the temperature values ​​of the third thermocouple 7-3 and the fourth thermocouple 7-4, and record the heating time t.

[0047] S10, repeating steps S7 and S8, and recording the temperature-time curves of the first thermocouple 7-1 and the second thermocouple 7-2.

[0048] S11 , plotting a power-time curve and a temperature-time curve of the first thermocouple 7 - 1 , the second thermocouple 7 - 2 , the third thermocouple 7 - 3 , and the fourth thermocouple 7 - 4 .

[0049] It should be noted that the thermal conductivity of the 3D printed structure filled with lattices in the space environment is an issue that needs to be focused on when 3D printed structural parts are used in the aerospace field. Therefore, in summary, the working principle of the present invention can be described as: the present invention sets up an electric cold plate (i.e., a cooling plate 5 that is powered on) and a water-cooled plate 6 as dual cooling sources to more realistically simulate the space environment without air convection and strong heat radiation; the insulation cotton on the side and bottom simulates the insulation environment at the heat source of the structural parts when in service and the insulation environment in the non-heat flow direction inside the lattice; thereby effectively reducing the impact of the thermal convection of the ground air on the test; when the present invention performs thermal performance testing, considering that in the structural parts used in aerospace, the number of unit cells of the lattice that is usually filled is not more than 5 in at least one direction, therefore, it is necessary to detect the temperature of the middle position and the position close to the edge in the middle horizontal direction, and then calculate the average as the final test temperature, so four thermocouples 7 are used for thermal performance testing.

[0050] The above is only a preferred implementation case of the present invention and does not limit the present invention in any form. Although the implementation process of the present invention is described in detail above, for those familiar with the art, they can still modify the technical solutions recorded in the above examples, or replace some of the technical features therein with equivalents. All modifications, equivalent replacements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for measuring the heat transfer performance of 3D printed metal lattices, characterized in that: include: The main body comprises a bottom heat-insulating cotton (1), a heat-insulating ceramic block (2), a heating plate (3), a dot matrix sample (4), a cooling plate (5), a water-cooling plate (6), a thermocouple (7), two water-cooling tubes (9), a side heat-insulating cotton (14) and a bottom fixing frame (15), wherein the bottom heat-insulating cotton (1) is provided with a heat-insulating ceramic block (2) and a bottom fixing frame (15), and the bottom fixing frame (15) surrounds the four sides of the heat-insulating ceramic block (2), the heat-insulating ceramic block (2) is provided with a heating plate (3), the heat-insulating plate (3) is provided with a dot matrix sample (4), the dot matrix sample (4) is provided with a cooling plate (5), the cooling plate (5) is provided with a water-cooling plate (6), and the water-cooling plate (6) is connected to one end of the two water-cooling tubes (9); one end of the thermocouple (7) is connected to the dot matrix sample (4); the side heat-insulating cotton (14) is wrapped around three sides of the dot matrix sample (4); A measuring module, comprising a temperature tester (8), wherein the temperature tester (8) is connected to the other end of the thermocouple (7); A cooling module, comprising an ice water tank (10) and a circulating water motor (11) and an ice bag (12) arranged in the ice water tank (10), wherein the ice water tank (10) is connected to the other end of a water cooling pipe (9), and the circulating water motor (11) is connected to the other end of another water cooling pipe (9); and The power module comprises a DC power supply (13), and the heating plate (3) and the cooling plate (5) are both connected to the DC power supply (13).

2. The device for measuring the heat transfer performance of 3D printed metal lattices according to claim 1, characterized in that: The thickness of the bottom heat insulation cotton (1) is 10 mm to 15 mm; The length and width of the bottom heat insulation cotton (1) are 1.5 to 2.5 times the outline dimensions of the bottom fixing frame (15); The height of the bottom fixing frame (15) is 1 to 1.5 times the height of the heat insulating ceramic block (2).

3. The device for measuring heat transfer performance of 3D printed metal lattice according to claim 1, characterized in that: The lattice sample (4) comprises a lower continuous block (4-1), an intermediate lattice block (4-2) and an upper continuous block (4-3), wherein the intermediate lattice block (4-2) is arranged between the lower continuous block (4-1) and the upper continuous block (4-3); The lower end continuous block (4-1) is provided with a first temperature detection hole (4-1-1) and a second temperature detection hole (4-1-2); the second temperature detection hole (4-1-2) is arranged at the geometric center of the lower end continuous block (4-1); the first temperature detection hole (4-1-1) is arranged at the right edge of the lower end continuous block (4-1); the distance between the first temperature detection hole (4-1-1) and the right edge of the lower end continuous block (4-1) is 1 / 4 to 1 / 5 of the horizontal length of the lower end continuous block (4-1); and the first temperature detection hole (4-1-1) and the second temperature detection hole (4-1-2) are located at the same height; The intermediate lattice block (4-2) includes a plurality of unit cells (4-2-1); The upper continuous block (4-3) is provided with a third temperature detection hole (4-3-1) and a fourth temperature detection hole (4-3-2); the fourth temperature detection hole (4-3-2) is arranged at the geometric center of the upper continuous block (4-3); the third temperature detection hole (4-3-1) is arranged at the right edge of the upper continuous block (4-3); the distance between the third temperature detection hole (4-3-1) and the right edge of the upper continuous block (4-3) is 1 / 4 to 1 / 5 of the horizontal length of the upper continuous block (4-3); and the third temperature detection hole (4-3-1) and the fourth temperature detection hole (4-3-2) are located at the same height.

4. The device for measuring heat transfer performance of 3D printed metal lattice according to claim 3, characterized in that: The height of the middle dot matrix block (4-2) is twice the sum of the heights of the lower continuous block (4-1) and the upper continuous block (4-3).

5. The device for measuring heat transfer performance of 3D printed metal lattice according to claim 1, characterized in that: When preparing the lattice sample (4), if the number of unit cells (4-2-1) in any direction is less than 3, different lattice samples (4) need to be prepared according to different cross sections of the unit cells (4-2-1) on the boundary.

6. The device for measuring heat transfer performance of 3D printed metal lattice according to claim 1, characterized in that: The length of the refrigeration sheet (5) is 1 to 1.5 times the length of the upper continuous block (4-3), and the width of the refrigeration sheet (5) is 1 to 1.5 times the width of the upper continuous block (4-3); The length of the water cooling plate (6) is 1 to 1.5 times the length of the refrigeration plate (5), and the width of the water cooling plate (6) is 1 to 1.5 times the width of the refrigeration plate (5); The length of the water cooling plate (6) is 1.5 to 2.5 times the length of the upper continuous block (4-3), and the width of the water cooling plate (6) is 1.5 to 2.5 times the width of the upper continuous block (4-3).

7. The device for measuring heat transfer performance of 3D printed metal lattices according to claim 1, characterized in that: The thermocouple (7) comprises a first thermocouple (7-1), a second thermocouple (7-2), a third thermocouple (7-3) and a fourth thermocouple (7-4), wherein one end of the first thermocouple (7-1) is connected to the fourth temperature detection hole (4-3-2), one end of the second thermocouple (7-2) is connected to the third temperature detection hole (4-3-1), and the other ends of the first thermocouple (7-1) and the second thermocouple (7-2) are connected to the temperature tester (8) for measuring the temperature of the upper heat output end; one end of the third thermocouple (7-3) is connected to the second temperature detection hole (4-1-2), one end of the fourth thermocouple (7-4) is connected to the first temperature detection hole (4-1-1), and the other ends of the third thermocouple (7-3) and the fourth thermocouple (7-4) are connected to the temperature tester (8) for measuring the temperature of the lower heat input end.

8. The device for measuring heat transfer performance of 3D printed metal lattices according to claim 1, characterized in that: An ice bag (12) is placed in the circulating water of the ice water tank (10) so that the temperature of the cooling water output by the ice water tank (10) is 0°C; the proportion of the ice bag (12) in the ice water tank (10) is 45% to 55%.

9. The device for measuring heat transfer performance of 3D printed metal lattices according to claim 1, characterized in that: The heating plate (3) is provided with a first heating port (3-1) and a second heating port (3-2); the cooling plate (5) is provided with a first cooling port (5-1) and a second cooling port (5-2); The DC power supply (13) is provided with a plurality of power supply channels (13-1), wherein the positive and negative electrodes of one power supply channel (13-1) are respectively connected to the first heating port (3-1) and the second heating port (3-2), so that the DC power supply (13) can supply power to the heating plate (3); and the positive and negative electrodes of one power supply channel (13-1) are respectively connected to the first cooling port (5-1) and the second cooling port (5-2), so that the DC power supply (13) can supply power to the cooling plate (5).

10. A method for measuring the heat transfer performance of a 3D printed metal lattice according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, putting half the volume of water and an ice bag (12) filled with ice into an ice water tank (10) to prepare a cooling liquid; S2, connecting one of the two water cooling pipes (9) to the circulating water motor (11), and the other to the ice water tank (10), and energizing the circulating water motor (11) to operate; S3, connecting the heating plate (3) and the cooling plate (5) to a DC power supply (13), and energizing the heating plate (3) and the cooling plate (5); S4, inserting the first thermocouple (7-1) into the fourth temperature detection hole (4-3-2), inserting the second thermocouple (7-2) into the third temperature detection hole (4-3-1), inserting the third thermocouple (7-3) into the second temperature detection hole (4-1-2), inserting the fourth thermocouple (7-4) into the first temperature detection hole (4-1-1), connecting the other ends of the first thermocouple (7-1), the second thermocouple (7-2), the third thermocouple (7-3) and the fourth thermocouple (7-4) to a temperature tester (8), and measuring their temperatures using the temperature tester (8); S5, recording the voltage and current of the DC power supply (13) and the temperature values ​​of the second thermocouple (7-2) and the fourth thermocouple (7-4); S6, after the temperature values ​​of the second thermocouple (7-2) and the fourth thermocouple (7-4) tend to be stable, stop recording the temperature values ​​of the second thermocouple (7-2) and the fourth thermocouple (7-4), and record the heating time t; S7, remove the heating plate (3) and the side insulation cotton (14), continue to power on the cooling plate (5) and the circulating water motor (11), and use the temperature tester (8) to measure the temperature value of the fourth thermocouple (7-4); S8, after the temperature value of the fourth thermocouple (7-4) returns to room temperature, i.e., 10-30°C, the heating plate (3) and the side heat insulation cotton (14) are reinstalled, the heating plate (3) continues to be powered on, and during the heating time t, the temperature-time curves of the third thermocouple (7-3) and the fourth thermocouple (7-4) are recorded; S9, after the temperature values ​​of the third thermocouple (7-3) and the fourth thermocouple (7-4) tend to be stable, stop recording the temperature values ​​of the third thermocouple (7-3) and the fourth thermocouple (7-4), and record the heating time t; S10, repeating steps S7 to S8, recording the temperature-time curves of the first thermocouple (7-1) and the second thermocouple (7-2); S11, plotting a power-time curve and a temperature-time curve of the first thermocouple (7-1), the second thermocouple (7-2), the third thermocouple (7-3) and the fourth thermocouple (7-4).

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