Humanoid robot radiation-sweating-liquid cooling collaborative cooling system

Abstract

This application provides a humanoid robot radiation-sweating-liquid cooling synergistic cooling system, belonging to the field of robot thermal management technology. It includes a liquid storage tank, a circulating pump, multiple heat source branches, and a radiator, all connected in a closed loop. Each heat source branch is equipped with a heat source, a regulating valve, and sensor components. The radiator includes a bionic skin covering the robot's surface. The bionic skin comprises an inner bionic microfluidic network layer and an outer radiation-sweating skin layer. The radiation-sweating skin layer is made of a spectrally selective flexible porous material. The cooling medium in the liquid storage tank absorbs heat from each heat source and then flows into the bionic microfluidic network layer, dissipating heat to the environment through the radiation-sweating skin layer. This solution improves the heat dissipation efficiency of the humanoid robot under high-load conditions, utilizes a passive cooling mechanism, reduces system energy consumption, reduces dependence on ambient temperature, and achieves daytime sub-environmental cooling.

Description

Technical Field

[0001] This application relates to the field of robot thermal management technology, and in particular to a humanoid robot radiation-sweating-liquid cooling synergistic cooling system. Background Technology

[0002] Existing liquid cooling systems for humanoid robots typically use air-cooled radiators, which dissipate the heat absorbed by the coolant into the environment by driving a fan. Other solutions integrate semiconductor refrigeration and magnetocooling into the liquid cooling system to cool the coolant, and then use air cooling to dissipate heat from the cooling module (semiconductor or magnetocooling). The specific technical solutions and their associated technical problems are as follows:

[0003] Existing technology 1: Liquid-air cooling heat dissipation system, such as patents CN120287347A and CN121043183A. The entire liquid cooling system is driven by a liquid pump to circulate the coolant. The coolant flows through the robot's heat-generating components (such as joint motors, batteries, etc.) to absorb heat, and then enters the air-cooled radiator to drive the fan to perform forced convection to cool the coolant and dissipate the heat to the environment. The cooled coolant enters the storage tank to complete the liquid cooling cycle.

[0004] Technical Problem Analysis: The efficiency of air cooling is affected by ambient temperature. As the ambient temperature rises, the cooling capacity gradually weakens, causing robots operating in high-temperature environments to be unable to effectively dissipate heat, leading to heat dissipation failure in high-temperature environments. Due to the low heat transfer coefficient of air cooling, the robot's drive fan consumes a lot of energy and generates significant noise under high loads. Furthermore, air cooling cannot cool the coolant below ambient temperature, failing to achieve daytime sub-ambient temperature reduction.

[0005] Existing technology 2: Liquid cooling-semiconductor refrigeration-air cooling heat dissipation system, such as patent CN120516753A. The entire liquid cooling system also uses a liquid pump to drive the circulation of coolant. After the coolant flows through the robot's heat source and absorbs heat, it enters the cooling channel inside the semiconductor module. The cold end of the semiconductor heat sink absorbs the heat of the coolant to cool it down and transfers the heat to the hot end of the semiconductor heat sink. In conjunction with the heat sink and fan, the heat from the hot end of the semiconductor heat sink is transferred to the environment in a forced air cooling manner.

[0006] Technical Problem Analysis: The thermoelectric conversion efficiency of semiconductors is limited by materials and generates additional energy consumption, significantly shortening the robot's endurance. When operating at high temperatures, the efficiency of air cooling is constrained by ambient temperature, and the air cooling system cannot dissipate heat in time, leading to thermal runaway. Semiconductor modules and drive circuits occupy additional space, increasing the complexity of robot structural design.

[0007] Existing technology 3: Liquid-magnetocooling-air-cooling heat dissipation system, such as patents CN120593425A and CN120521324A. The entire liquid cooling system also uses a liquid pump to drive the coolant circulation. The coolant flows through several liquid cooling channels, each of which is located at a heat source on the robot and is used to cool the heat source. The magnetic refrigeration device is connected to and conducts through the liquid cooling channels to cool the coolant. The air-cooling device is connected to and conducts through the magnetic refrigeration device to dissipate heat from the magnetic refrigeration device. The magnetic refrigeration device includes a magnetocaloric material and a magnetic field generating mechanism. The magnetic field generating mechanism provides a magnetic field to the magnetocaloric material, which is magnetized. The coolant passes through the magnetized magnetocaloric material, carrying away the heat from the magnetized magnetocaloric material to the air-cooling device. The demagnetized magnetocaloric material cools the coolant that has passed through the air-cooling device. The coolant that has been cooled by the demagnetized magnetocaloric material then enters each liquid cooling channel.

[0008] Technical Problem Analysis: The heat dissipation efficiency of the air-cooling device is limited by the ambient temperature. In high-temperature environments, it cannot effectively cool the magnetocaloric material, leading to thermal runaway. Both the air-cooling and magnetocaloric devices require additional power for heat dissipation, which increases system complexity, thus shortening the robot's endurance and increasing the difficulty of structural design.

[0009] In summary, the above three types of systems suffer from system-level defects due to their reliance on air-cooled heat dissipation terminals: heat dissipation capacity is strongly coupled with ambient temperature, and heat dissipation efficiency drops sharply under high temperature conditions; active cooling components are accompanied by high energy consumption; and the potential of natural cooling has not been explored, failing to utilize the zero-power advantages of radiative cooling (RC) and evaporative cooling (EC). Summary of the Invention

[0010] In view of this, the present application provides a humanoid robot radiation-sweating-liquid cooling system, which at least partially solves the problems of heat dissipation efficiency being limited by ambient temperature, excessive heat dissipation energy consumption, and inability to adapt to daytime sub-environmental cooling requirements of humanoid / quadruped robots working outdoors in high-temperature environments.

[0011] This application provides a humanoid robot radiation-sweating-liquid cooling synergistic cooling system, including a liquid storage tank, a circulation pump, multiple heat source branches, and a radiator connected in sequence to form a closed loop. Each heat source branch is equipped with a heat source, a regulating valve, and a sensor assembly. The radiator includes a bionic skin covering the robot's surface. The bionic skin includes an inner bionic microfluidic network layer and an outer radiation-sweating skin layer. The radiation-sweating skin layer is made of a flexible porous material with spectral selectivity. The cooling medium in the liquid storage tank absorbs heat through each heat source and then flows into the bionic microfluidic network layer, achieving heat dissipation to the environment through the radiation-sweating skin layer.

[0012] According to a specific implementation of this application, the radiative sweating skin layer includes an outer microsphere array, a middle transition layer, and an inner porous matrix. The porous matrix is ​​connected to a biomimetic microfluidic network layer. By adjusting the diameter, filling density, and arrangement of the microspheres in the microsphere array, combined with the porous matrix, the reflectivity of the radiative sweating skin layer to the solar spectrum band and the emissivity to the atmospheric window band are adjusted. The porous matrix is ​​provided with micropores of different sizes and shapes. One side of the transition layer uniformly covers the bottom of the microsphere array, and the other side of the transition layer is embedded in the surface micropores of the porous matrix to achieve anchoring adhesion.

[0013] According to a specific implementation of the present application, the porous matrix is ​​manufactured by a 3D printing layered curing process. The porous matrix includes a first layer, a second layer and a third layer stacked together. The first layer is in contact with the transition layer, and the third layer is in contact with the biomimetic microfluidic network layer. The micropores of each layer are prepared using soluble microsphere templates, and the micropore diameter decreases layer by layer from the first layer to the third layer.

[0014] According to a specific implementation of an embodiment of this application, the first layer uses a PMMA microsphere template with a diameter of 150-200μm, the second layer uses a PMMA microsphere template with a diameter of 100-150μm, and the third layer uses a PMMA microsphere template with a diameter of 50-80μm.

[0015] According to one specific implementation of the embodiments of this application, the diameter of the microspheres in the microsphere array is 200-1100nm, the filling density is 82-88%, and the arrangement includes close-packed hexagonal.

[0016] According to one specific implementation of the embodiments of this application, the reflectivity of the radiative sweating skin layer to the solar spectrum band is greater than or equal to 0.90, and the emissivity to the atmospheric window band is greater than or equal to 0.90.

[0017] According to a specific implementation of an embodiment of this application, the biomimetic microfluidic network layer includes a flexible thermally conductive silicone layer, a thermally conductive filler is added to the flexible thermally conductive silicone layer, and a biomimetic leaf vein channel is processed on the flexible thermally conductive silicone layer. The biomimetic leaf vein channel is set as a hierarchical structure of main vein-branch-terminus, and the biomimetic leaf vein channel is used for the transmission of cooling medium.

[0018] According to one specific implementation of the embodiments of this application, the biomimetic microfluidic network layer is bonded to the radiative sweating skin layer through a thermo-press bonding process.

[0019] According to a specific implementation of the embodiments of this application, the microsphere array is configured as a SiO2, Al2O3 or TiO2 microsphere array, the transition layer is a silane coupling agent, and the porous matrix is ​​polydimethylsiloxane.

[0020] According to one specific implementation of this application, the thermally conductive filler includes at least one of graphene, carbon nanotubes, boron nitride, aluminum oxide, and liquid metal.

[0021] Beneficial effects: The humanoid robot radiation-sweating-liquid cooling system in this embodiment of the application brings significant advantages and technical effects through the "robot bionic skin radiator" and the "radiation-sweating-liquid cooling" synergistic cooling, as detailed below: Robotic Bionic Skin Radiator: This bionic skin radiator employs a dual-layer structure. The inner layer is a bionic microfluidic network layer, with bionic leaf vein channels for distributing and transferring coolant, and conducting the coolant heat to the outer radiative sweating skin layer. The outer layer, also a radiative sweating skin layer, is a flexible porous material with spectral selectivity, achieving high solar spectral reflectivity and high atmospheric window emissivity, thus providing radiative cooling. Simultaneously, the porous structure facilitates the absorption of liquid to the surface via capillary effect, achieving sweating cooling. This solves the problems of "heat dissipation efficiency limited by ambient temperature," "excessive heat dissipation energy consumption," and "inability to adapt to daytime sub-environmental cooling needs." It fully utilizes passive heat dissipation mechanisms, reduces system heat dissipation energy consumption, minimizes dependence on ambient temperature, and achieves daytime sub-environmental cooling.

[0022] Radiation-Sweating-Liquid Cooling Synergistic Cooling: A circulating pump drives coolant to flow through the cooling chambers of various heat sources for heat absorption. After exchanging heat with the heat sources, the coolant flows through a biomimetic microchannel network in the inner layer of the robot's skin. Some coolant penetrates the outer skin surface, while heat is transferred to the outer skin through thermally conductive silicone. Combined with radiation and sweating from the outer skin, heat is transferred to outer space and the ambient air. Subsequently, the remaining coolant flows back to the storage tank, completing the cooling cycle. This solution addresses the problems of "heat dissipation efficiency being limited by ambient temperature," "excessive heat dissipation energy consumption," and "inability to adapt to daytime sub-environmental cooling needs." Through the synergy of active and passive cooling technologies, the overall energy consumption of the cooling system is reduced. By integrating radiative cooling and sweating cooling, the dependence of traditional air-cooled heat dissipation efficiency on ambient temperature is reduced, enabling daytime sub-environmental cooling.

[0023] In summary, this invention achieves daytime sub-environmental cooling through a radiation-sweating-liquid cooling synergistic cooling system, which is particularly suitable for heat dissipation scenarios of humanoid robots working under high load outdoors. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1This is a schematic diagram of a humanoid robot radiation-sweating-liquid cooling system according to an embodiment of the present invention.

[0026] In the diagram: 1. Storage tank; 2. Circulation pump; 3. Regulating valve; 4. Heat source; 5. Bionic skin; 6. Bionic microfluidic network layer; 7. Radiation-induced sweating skin layer. Detailed Implementation

[0027] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0028] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0030] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0031] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0032] This application provides a humanoid robot radiation-sweating-liquid cooling collaborative cooling system, specifically involving an active-passive integrated cooling system for humanoid or quadruped robots working outdoors. It includes a radiation-sweating skin layer 7 with both radiation cooling and sweating cooling functions, and a biomimetic microfluidic network. This system is suitable for high-load outdoor robot heat dissipation scenarios, addressing the systemic heat dissipation deficiencies of humanoid / quadruped robots working outdoors in high-temperature environments. Specifically, it addresses the following core issues: Heat dissipation efficiency is limited by ambient temperature: existing solutions cannot maintain effective temperature drop under high daytime temperatures, and the accumulated heat radiation from the solar spectrum cannot be reflected efficiently, leading to overheating of the robot's joint motors; Excessive heat dissipation energy consumption: Existing fan cooling methods consume a lot of power, do not make full use of passive cooling mechanisms, and waste the potential of natural heat dissipation; Unable to adapt to daytime sub-environmental cooling requirements: Existing robots do not integrate radiative cooling and sweating cooling mechanisms, lack system-level thermal management, and are unable to cool down high-temperature environments below ambient temperature.

[0033] The following reference Figure 1 The description specifically outlines the composition of a humanoid robot's radiation-sweating-liquid cooling system, which includes a liquid storage tank 1, a circulating pump 2, multiple heat source branches 4 connected in sequence to form a closed loop, and a radiator. Each heat source branch 4 is equipped with a heat source 4, a regulating valve 3, and a sensor assembly. The radiator includes a bionic skin 5 covering the robot's surface, serving as the interface between the robot and the environment while also functioning as a heat sink. The bionic skin 5 includes an inner bionic microfluidic network layer 6 and an outer radiation-sweating skin layer 7. The radiation-sweating skin layer 7 is made of a flexible porous material with spectral selectivity. The cooling medium in the liquid storage tank 1 absorbs heat from each heat source 4 and then flows into the bionic microfluidic network layer 6, where it dissipates heat to the environment through the radiation-sweating skin layer 7. The bionic skin 5 radiator, in conjunction with the liquid cooling system, achieves sub-environmental daytime cooling for robots in outdoor high-temperature environments through the physical coupling of radiative cooling, evaporative cooling, and liquid cooling. Among them, radiative and evaporative cooling achieve zero-power heat dissipation, the liquid cooling system achieves precise temperature control, and the heat exchange uniformity is improved through the bionic microfluidic network layer 6.

[0034] In this embodiment, the circulating pump 2, the liquid reservoir, the cooling channels of the heat source 4 (such as the liquid cooling jacket of the robot joint), the regulating valve 3, the measuring instruments (sensors for temperature, pressure, and flow, etc.), and the control system constitute the liquid cooling system. The cooling medium can be deionized water, or fluorinated liquid, ethylene glycol, refrigerant, and corresponding mixtures can be used instead of deionized water as the cooling medium. Each branch of the heat source 4 (joint motor, controller, battery, etc.) can be connected in series, in parallel, or in a series-parallel hybrid configuration. The coolant in the liquid reservoir 1 flows through the cooling channels of each heat source 4 via the circulating pump 2 to absorb heat; after exchanging heat with the heat source 4, the coolant from each branch converges and flows through the biomimetic microchannel network of the inner layer of the robot's skin, transferring heat to outer space and the ambient air in conjunction with radiation and sweating from the outer layer of the skin; subsequently, the coolant flows back to the liquid reservoir 1, completing the cooling cycle.

[0035] Specifically, the radiative sweating skin layer 7 reflects most of the short-wave solar radiation through spectrally selective materials, while simultaneously emitting heat from the robot's interior into the external environment as long-wave radiation, achieving passive radiative cooling without energy consumption. Simultaneously, the cooling medium seeps to the surface through the porous structure of the radiative sweating skin layer 7, evaporating and carrying away heat, achieving biomimetic active heat dissipation through sweating. The amount of sweating can be controlled collaboratively by the pump speed and the regulating valve 3 at the inlet of the storage tank 1. Multiple heat source branches 4 can independently adjust the cooling medium flow rate of each branch according to the actual heat generation of different joints through the regulating valve 3. Combined with temperature feedback from sensor components (including temperature and flow sensors), precise temperature control is achieved, while reducing the overall system's heat dissipation energy consumption. In addition to transmitting the cooling medium, the biomimetic microfluidic network layer 6 can also uniformly conduct the heat generated by the robot's internal heat source 4 to the outer radiative sweating skin layer 7, preventing localized heat accumulation. The synergistic effect of radiation, sweating, and liquid cooling mechanisms can reduce the robot's core temperature below ambient temperature in high-temperature outdoor environments, while fully utilizing the energy-saving potential of passive radiative cooling and reducing overall heat dissipation energy consumption.

[0036] In one embodiment, the radiative sweating skin layer 7 includes an outer microsphere array, a middle transition layer, and an inner porous matrix. The porous matrix is ​​connected to the biomimetic microfluidic network layer 6. By adjusting the diameter, filling density, and arrangement of the microspheres in the microsphere array, combined with the porous matrix, the reflectivity of the radiative sweating skin layer 7 to the solar spectrum band and the emissivity to the atmospheric window band can be adjusted. The porous matrix is ​​provided with micropores of different sizes and shapes. One side of the transition layer uniformly covers the bottom of the microsphere array, and the other side of the transition layer is embedded in the surface micropores of the porous matrix to achieve anchoring adhesion and prevent the microsphere array from falling off.

[0037] In practical implementation, the microsphere array, as a spectrally selective material, allows for the adjustment of the reflectivity of the radiative sweating skin layer 7 to the solar spectral band and its emissivity to the atmospheric window band by controlling the diameter, filling density, and arrangement of the microspheres. The microspheres in the array have a diameter of 200-1100 nm, a filling density of 82-88%, and are preferably arranged in a close-packed hexagonal configuration. This achieves a reflectivity of ≥0.90 for the solar spectral band (0.3-2.5 μm) and an emissivity of ≥0.90 for the atmospheric window band (8–13 μm) in the radiative sweating skin layer 7.

[0038] Preferably, the microsphere array is configured as a SiO2, Al2O3, or TiO2 microsphere array, distributed according to a preset arrangement.

[0039] In one embodiment, the layered structure of the radiative sweating skin layer 7 is anchored by a silane coupling agent. First, the outer surface of the porous substrate is treated with oxygen plasma to enhance its surface affinity. Then, the silane coupling agent (such as KH550) is diluted in an ethanol solution at a ratio of 1:10 and uniformly coated on the surface of the porous substrate to form an intermediate transition layer. Subsequently, SiO2 microspheres are deposited on the surface of the transition layer using a vertical deposition self-assembly method to achieve the "anchoring" effect.

[0040] Furthermore, the porous matrix is ​​manufactured using a 3D printing layered curing process. The porous matrix includes a first layer, a second layer, and a third layer stacked together. The first layer is in contact with the transition layer, and the third layer is in contact with the biomimetic microfluidic network layer 6. The micropores in each layer are prepared using soluble microsphere templates, and the micropore diameter decreases layer by layer from the first layer to the third layer.

[0041] In this embodiment, the micropore diameter of the porous matrix decreases layer by layer from the first to the third layer, and the porosity gradually decreases, forming a gradient capillary force that can automatically drive the coolant to permeate from the inner micropores to the outer layer.

[0042] Furthermore, the first layer uses PMMA microsphere templates with a diameter of 150-200μm, the second layer uses PMMA microsphere templates with a diameter of 100-150μm, and the third layer uses PMMA microsphere templates with a diameter of 50-80μm.

[0043] In practice, the porous substrate is set as a polydimethylsiloxane (PDMS) matrix containing micropores of different sizes and shapes, with pore diameters ranging from 50 to 200 μm. The porous substrate is manufactured using a 3D printing layer-by-layer curing process. The specific manufacturing process includes: mixing liquid polydimethylsiloxane (PDMS) and a curing agent at a ratio of 10:1, and adding 5% by weight of a soluble microsphere template (such as polymethyl methacrylate). Methacrylate (PMMA) microspheres (50-200 μm in diameter) were stirred until homogeneous and then degassed. The microspheres were then printed in layers according to a pre-defined gradient pore size (e.g., outer layer (first layer in contact with the transition layer): using a PMMA template with a diameter of 150-200 μm, with a printing thickness of 300 μm; middle layer (second layer): using a PMMA template with a diameter of 100-150 μm, with a printing thickness of 300 μm; inner layer (third layer in contact with the biomimetic microchannels): using a PMMA template with a diameter of 50-80 μm, with a printing thickness of 400 μm). The printed substrate was then cured in an 80°C oven for 2 hours, followed by immersion in an acetone solution for 24 hours to dissolve and remove the PMMA microsphere template, forming a gradient microporous structure.

[0044] In this embodiment, the radiative sweating skin layer 7 can utilize the difference in radiation characteristics between the solar spectrum (0.3-2.5μm) and the atmospheric window (8-13μm) to achieve both strong solar light reflection and infrared thermal radiation, thereby achieving a radiative cooling effect. The porous sweating flexible matrix contains a multi-sized pore structure, simulating the pores of human skin. Coolant can penetrate the surface layer through the porous matrix to achieve an evaporative cooling effect. The capillary pressure difference can be increased by constructing a gradient pore structure (with pore size gradually increasing from the inside to the outside), thereby enhancing the coolant penetration process.

[0045] In one embodiment, the biomimetic microfluidic network layer 6 includes a flexible thermally conductive silicone layer with thermally conductive filler added within it. Bionic leaf vein channels are fabricated on the flexible thermally conductive silicone layer, and these channels are configured with a hierarchical structure of main vein-branch-terminus, exhibiting the characteristics of biomimetic leaf veins. These channels are used for the transport of the cooling medium. The inlet end of the biomimetic microfluidic network receives heated coolant from a heat source 4 (such as a joint motor), and the outlet end discharges cooled coolant into a reservoir.

[0046] In practice, a 3D printing pre-forming + hot-press bonding composite process is used to prepare biomimetic leaf vein channels. A soluble flow channel template is fabricated using photopolymerization 3D printing technology. The printed template is then pasted onto the surface of a semi-cured thermally conductive silicone sheet, aligned and fixed according to a pre-defined flow channel layout. Another semi-cured thermally conductive silicone sheet is taken and processed with directional micropores (50-80 μm in diameter) using ultraviolet laser perforation technology. This micropore is then aligned with the semi-cured thermally conductive silicone sheet with the attached flow channel template and placed in a hot-pressing device to completely cure and bond the two silicone layers. The bonded silicone sheet is then immersed in an 80°C NaOH solution (5% concentration) to dissolve the internal soluble flow channel template, forming a hollow biomimetic leaf vein microchannel network. The silicone sheet is rinsed three times with deionized water to remove residual NaOH solution, and then dried in a 60°C oven for 2 hours to complete the microchannel preparation.

[0047] In another embodiment, the biomimetic leaf vein channels are fabricated using a laser etching process. The channels are processed on the surface of a thermally conductive silicone substrate using ultraviolet laser etching. The porous substrate side of the radiant, sweating skin is aligned with the channel surface of the thermally conductive silicone substrate, ensuring that the channels are completely covered by the skin. A vacuum thermocompression bonding process is used to tightly bond the porous substrate of the skin to the silicone channel surface in a vacuum environment, utilizing the skin's microporous structure to seal the channels and simultaneously create a coolant penetration path.

[0048] Furthermore, the thermally conductive filler includes at least one of graphene, carbon nanotubes, boron nitride, alumina, and liquid metal. Using silicone as the substrate, thermally conductive fillers are added to construct thermally conductive pathways and increase the thermal conductivity of the material.

[0049] In one embodiment, the biomimetic microfluidic network layer 6 is bonded to the radiative sweating skin layer 7 via a thermo-press bonding process. This includes: treating the outer surface of the thermally conductive silicone sheet after microfluidic fabrication with oxygen plasma to enhance surface adhesion; aligning the pretreated thermally conductive silicone sheet with the outer radiative sweating skin layer, placing them in a thermo-pressing device, and achieving a strong bond between the two layers through thermo-press bonding.

[0050] In this embodiment, the biomimetic microfluidic network is mainly used to conduct coolant. Some coolant can penetrate to the skin surface through the outer layer of radiative sweating skin and evaporate. Flexible thermally conductive silicone can conduct the heat of the coolant to the outer skin. Together with the outer skin, the coolant absorbs heat at the heat source 4 and transfers it to the external environment through radiation, sweating and other means, achieving efficient and coordinated heat dissipation. The graded leaf vein-like flow channel structure can improve the uniformity of coolant distribution, avoid local high temperature, and reduce the flow resistance of the circulating pump, thereby reducing the overall pump power consumption of the liquid cooling system.

[0051] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A humanoid robot radiation-sweating-liquid cooling synergistic cooling system, characterized in that, The system includes a liquid storage tank (1), a circulation pump (2), multiple heat source (4) branches, and a radiator, which are connected in sequence to form a closed loop. Each heat source (4) branch is equipped with a heat source (4), a regulating valve (3), and a sensor assembly. The radiator includes a bionic skin (5) covering the surface of the robot. The bionic skin (5) includes a bionic microfluidic network layer (6) located in the inner layer and a radiative sweating skin layer (7) located in the outer layer. The radiative sweating skin layer (7) is made of a flexible porous material with spectral selectivity. The cooling medium in the liquid storage tank (1) absorbs heat through each heat source (4) and flows into the bionic microfluidic network layer (6), and dissipates heat to the environment through the radiative sweating skin layer (7).

2. The humanoid robot radiation-sweating-liquid cooling synergistic cooling system according to claim 1, characterized in that, The radiation-induced sweating skin layer (7) includes an outer microsphere array, a middle transition layer, and an inner porous matrix. The porous matrix is ​​connected to the biomimetic microfluidic network layer (6). By adjusting the diameter, filling density, and arrangement of the microspheres in the microsphere array, combined with the porous matrix, the reflectivity of the radiation-induced sweating skin layer (7) to the solar spectrum band and the emissivity to the atmospheric window band are adjusted. The porous matrix is ​​provided with micropores of different sizes and shapes. One side of the transition layer is uniformly covered on the bottom of the microsphere array, and the other side of the transition layer is embedded in the surface micropores of the porous matrix to achieve anchoring adhesion.

3. The humanoid robot radiation-sweating-liquid cooling synergistic cooling system according to claim 2, characterized in that, The porous matrix is ​​manufactured using a 3D printing layered curing process. The porous matrix includes a first layer, a second layer, and a third layer stacked together. The first layer is in contact with the transition layer, and the third layer is in contact with the biomimetic microfluidic network layer (6). The micropores of each layer are prepared using soluble microsphere templates, and the micropore diameter decreases layer by layer from the first layer to the third layer.

4. The humanoid robot radiation-sweating-liquid cooling synergistic cooling system according to claim 3, characterized in that, The first layer uses PMMA microsphere templates with a diameter of 150-200μm, the second layer uses PMMA microsphere templates with a diameter of 100-150μm, and the third layer uses PMMA microsphere templates with a diameter of 50-80μm.

5. The humanoid robot radiation-sweating-liquid cooling synergistic cooling system according to claim 2, characterized in that, The microspheres in the microsphere array have a diameter of 200-1100 nm, a filling density of 82-88%, and are arranged in a close-packed hexagonal pattern.

6. The humanoid robot radiation-sweating-liquid cooling synergistic cooling system according to claim 2, characterized in that, The reflectivity of the radiative sweating skin layer (7) to the solar spectrum band is greater than or equal to 0.90, and the emissivity to the atmospheric window band is greater than or equal to 0.

90.

7. The humanoid robot radiation-sweating-liquid cooling synergistic cooling system according to claim 1, characterized in that, The biomimetic microfluidic network layer (6) includes a flexible thermally conductive silicone layer, which contains thermally conductive fillers. The flexible thermally conductive silicone layer is fabricated with biomimetic leaf vein channels. The biomimetic leaf vein channels are set as a hierarchical structure of main vein-branch-terminal. The biomimetic leaf vein channels are used for the transmission of cooling medium.

8. The humanoid robot radiation-sweating-liquid cooling synergistic cooling system according to claim 1, characterized in that, The biomimetic microfluidic network layer (6) is bonded to the radiation-induced sweating skin layer (7) through a thermo-press bonding process.

9. The humanoid robot radiation-sweating-liquid cooling synergistic cooling system according to any one of claims 2-6, characterized in that, The microsphere array is configured as a SiO2, Al2O3, or TiO2 microsphere array, the transition layer uses a silane coupling agent, and the porous matrix uses polydimethylsiloxane.

10. The humanoid robot radiation-sweating-liquid cooling synergistic cooling system according to claim 7, characterized in that, Thermally conductive fillers include at least one of graphene, carbon nanotubes, boron nitride, aluminum oxide, and liquid metal.

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