A solar-powered fan-type double-layer functional membrane composite cooling umbrella

Abstract

This invention discloses a solar-powered fan-type double-layer functional membrane composite cooling umbrella, relating to the field of daily necessities technology. It includes an umbrella canopy, an umbrella frame, and an umbrella handle. The umbrella canopy has a double-layer composite structure, comprising an outer membrane and an inner membrane. The outer membrane is a subwavelength structure with anti-reflection function, and its outer surface has a subwavelength concave-convex structure, the unit size of which is smaller than the wavelength of visible light. A solar panel is laid on the outer surface of the outer membrane. The inner membrane is a cooling film. A fan is installed at the top of the umbrella frame, with the fan outlet facing downwards. An energy storage unit is installed inside the umbrella handle, and the energy storage unit is electrically connected to the solar panel and the fan. The subwavelength concave-convex structure effectively reduces solar reflectivity and improves light energy absorption efficiency, providing more light energy to the solar panel. The solar panel converts light energy into electrical energy, which, together with the energy storage unit, stores the electrical energy to provide continuous power to the fan. The inner cooling film absorbs heat under the umbrella and dissipates it in the form of thermal radiation, achieving passive cooling.

Description

Technical Field

[0001] This invention relates to the field of daily necessities technology, and more specifically to a solar-powered fan-type double-layer functional membrane composite cooling umbrella. Background Technology

[0002] With the increasing frequency of outdoor outings and leisure activities, sun umbrellas have become an essential sun protection tool in summer. Traditional sun umbrellas only block direct sunlight through the canopy, failing to effectively cool the microenvironment beneath. Under strong sunlight, the canopy absorbs a large amount of solar radiation heat and conducts it downwards, resulting in intense stuffiness and poor comfort. While existing sun umbrellas with fans can achieve some cooling effect through airflow, they still have significant shortcomings:

[0003] Firstly, most fans are powered by external batteries or built-in ordinary batteries, which have limited battery life and require frequent charging or battery replacement, making them inconvenient to use. They also rely on external power sources and are not energy-efficient or environmentally friendly. Secondly, the umbrella canopy is mostly made of a single layer of ordinary fabric, lacking efficient anti-reflection and light and heat management design. It has high solar reflectivity and low solar energy utilization, making it difficult to use solar energy to power the fan and unable to achieve self-powered long-term operation. Third, existing sun umbrellas rely solely on active airflow from fans, lacking passive heat dissipation and efficient heat insulation structures. The umbrella surface itself has insufficient heat insulation and radiative heat dissipation capabilities, resulting in limited overall cooling effect and high energy consumption.

[0004] Therefore, how to provide a cooling umbrella that can be powered by solar energy and has both heat insulation and heat dissipation functions as well as fan cooling functions is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a solar-powered fan-type double-layer functional membrane composite cooling umbrella, which aims to solve one of the above-mentioned technical problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A solar-powered fan-type double-layer functional film composite cooling umbrella includes an umbrella canopy, an umbrella frame, and an umbrella handle. The umbrella canopy has a double-layer composite structure, including an outer film and an inner film. The outer film is a subwavelength structure film layer with anti-reflection function, and its outer surface has a subwavelength concave-convex structure. The unit size of the concave-convex structure is smaller than the wavelength of visible light. A solar panel is laid on the outer surface of the outer film. The inner film is a cooling film. A fan is installed on the top of the umbrella frame, and the air outlet of the fan is arranged downwards; An energy storage unit is installed inside the umbrella handle, and the energy storage unit is electrically connected to the solar panel and the fan.

[0007] Through the above technical solution, this invention discloses a solar-driven fan-type double-layer functional film composite cooling umbrella. The subwavelength concave-convex structure effectively reduces solar reflectivity and improves light energy absorption efficiency, providing more light energy for the solar panel. The solar panel converts light energy into electrical energy, which is stored in conjunction with the energy storage unit to provide continuous power to the fan. The inner cooling film can absorb heat under the umbrella and dissipate it in the form of thermal radiation, achieving passive cooling. The fan outlet faces downward, promoting airflow under the umbrella and enhancing the perceived cooling effect. The passive radiation heat dissipation and the active fan airflow work together to effectively improve the cooling effect of the umbrella.

[0008] Preferably, in the above-mentioned solar-powered fan-type double-layer functional membrane composite cooling umbrella, the cooling film is a passive radiation cooling film with an infrared emissivity ≥0.9 in the 8–13 μm wavelength band. The passive radiation cooling film has high infrared emissivity, and its emission band covers an 8–13 μm atmospheric transparent window, achieving efficient passive heat dissipation.

[0009] Preferably, in the aforementioned solar-driven fan-type double-layer functional film composite cooling umbrella, the passive radiation cooling film is composed of hexagonal boron nitride, silicon dioxide / silicon nitride multilayer film, or polymer-based composite cooling coating. All of these materials possess stable high infrared emissivity, ensuring the reliability of the passive radiation cooling effect.

[0010] Preferably, in the above-mentioned solar-driven fan-type double-layer functional film composite cooling umbrella, the material of the subwavelength structure film layer is SiO2, TiO2, or a polymer nanostructure. Materials such as SiO2 and TiO2 have suitable optical refractive indices, and the subwavelength structure can achieve a wide-band, wide-angle anti-reflection effect; the low reflectivity ensures that more sunlight passes through and is absorbed by the solar panel, thereby increasing power generation.

[0011] Preferably, in the above-mentioned solar-driven fan-type double-layer functional membrane composite cooling umbrella, a heat-insulating gap exists between the outer membrane and the inner membrane. This heat-insulating gap is formed by multiple micro-insulation points positioned between the outer and inner membranes. The air gap blocks heat conduction between the outer and inner membranes, preventing heat from flowing back from the outer layer to the inner layer; it ensures that the passive radiative cooling effect of the inner membrane is not affected by the high temperature of the outer membrane, maintaining the umbrella's cooling performance; the micro-insulation points provide uniform support, maintaining a stable gap between the two membranes and preventing adhesion or collapse.

[0012] Preferably, in the above-mentioned solar-driven fan-type double-layer functional film composite cooling umbrella, the thickness of the heat insulation gap is 1-3 mm. An air gap of 1-3 mm is sufficient to form an effective thermal resistance layer and suppress heat conduction; this thickness range ensures the heat insulation effect without affecting the overall thickness and folding performance of the umbrella surface.

[0013] Preferably, in the above-mentioned solar-powered fan-type double-layer functional film composite cooling umbrella, the outer side of the fan is provided with a protective net. The protective net can protect the fan and improve safety.

[0014] Preferably, in the above-mentioned solar-powered fan-type double-layer functional film composite cooling umbrella, a power management module is also installed inside the umbrella handle. The solar panel and the energy storage unit are electrically connected to the power management module, and the power management module is electrically connected to the fan. The power management module performs voltage regulation on the unstable output of the solar panel to ensure that the fan receives a stable voltage; it automatically switches the power supply source according to the light conditions (the solar panel directly supplies the fan when there is sufficient light, and the energy storage unit supplies power when there is insufficient light).

[0015] Preferably, in the above-mentioned solar-powered fan-type double-layer functional film composite cooling umbrella, a power switch is provided on the umbrella handle for controlling the fan's on / off state. The fan can be turned on or off as needed, avoiding power waste; the power switch is conveniently located on the umbrella handle.

[0016] Preferably, in the above-mentioned solar-driven fan-type double-layer functional film composite cooling umbrella, the umbrella frame is a hollow structure with an internal wiring channel. The wires connecting the solar panel and the power management module can pass through the hollow umbrella frame; the umbrella frame provides mechanical protection for the internal wires, preventing them from being scratched or broken by external objects; it avoids safety hazards such as leakage and short circuits caused by exposed wires; the hollow structure design facilitates wire threading during production and assembly, improving production efficiency.

[0017] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a solar-driven fan-type double-layer functional film composite cooling umbrella, which has the following beneficial effects: 1. This invention effectively reduces solar reflectivity and enhances light absorption through the subwavelength antireflection structure of the outer film. Combined with solar panels laid on the outer surface of the outer film and an energy storage unit inside the umbrella handle, it enables a solar-powered self-driving fan, eliminating the need for an external power source or battery replacement. This results in energy efficiency, environmental friendliness, and long battery life. Simultaneously, the inner cooling film (preferably a passive radiative cooling film) has high infrared emissivity in the 8–13 μm wavelength band, allowing heat to be dissipated under the umbrella through thermal radiation.

[0018] 2. This invention effectively inhibits the conduction of heat absorbed by the outer membrane to the inner membrane through the heat insulation gap and micro-isolation point support structure between the two membranes, ensuring that the passive radiative cooling effect is not disturbed. The active airflow of the fan promotes air circulation under the umbrella, forming a dual cooling synergy with passive heat dissipation. In addition, the power management module inside the umbrella handle realizes voltage stabilization, charge and discharge management, and automatic switching of power supply path. The power switch is easy to control as needed, the protective net ensures safety during use, and the internal wiring channel of the hollow umbrella frame allows for concealed wiring. The overall structure is safe and convenient. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 The attached figure is a structural schematic diagram of the solar-driven fan-type double-layer functional membrane composite cooling umbrella provided by the present invention.

[0021] The components are: 1-umbrella canopy; 2-umbrella frame; 3-umbrella handle; 4-solar panel; 5-fan; 6-energy storage unit; 7-protective net; 8-power switch. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] See appendix Figure 1 As shown in the figure, an embodiment of the present invention discloses a solar-driven fan-type double-layer functional membrane composite cooling umbrella, including: umbrella surface 1, umbrella frame 2 and umbrella handle 3.

[0024] The umbrella surface 1 has a double-layer composite structure, consisting of an outer film and an inner film. The outer film is a subwavelength structure with anti-reflection function, and its outer surface has a subwavelength concave-convex structure. The unit size of the concave-convex structure is smaller than the wavelength of visible light (400-700nm), which is used to reduce solar reflectivity and enhance light absorption. A solar panel 4 is laid on the outer surface of the outer film; the inner film is a cooling film.

[0025] A fan 5 is installed on the top of the umbrella frame 2. The air outlet of the fan 5 is arranged downwards to deliver air into the space under the umbrella. A protective net 7 is provided on the outer side of the fan 5 to isolate the fan from the user and provide protection.

[0026] An energy storage unit 6 and a power management module are installed inside the umbrella handle 3. The energy storage unit 6 is electrically connected to the solar panel 4 and the fan 5. Specifically, the solar panel 4 and the energy storage unit 6 are electrically connected to the power management module, and the power management module is electrically connected to the fan 5. A power switch 8 is provided on the umbrella handle 3 to control the opening and closing of the fan 5.

[0027] The umbrella frame 2 has a hollow structure and an internal channel through which the power supply line passes, which is used to hide the wires connecting the solar panel 4 and the power management module.

[0028] In one specific embodiment, the cooling film is a passive radiative cooling film with an infrared emissivity ≥0.9 in the 8–13 μm wavelength band. Specifically, the passive radiative cooling film is composed of a hexagonal boron nitride (h-BN) composite coating. The subwavelength structure film layer is made of SiO2 and is formed on a transparent polymer substrate using a nanoimprinting process. A thermal insulation gap exists between the outer and inner layers, supported by multiple micro-isolation points disposed between them, with a thickness of 2 mm. The energy storage unit 6 is a 2000 mAh lithium polymer energy storage battery. The fan 5 has a rated voltage of 5V.

[0029] In other embodiments, the passive radiative cooling film is composed of a silicon dioxide / silicon nitride multilayer film with an infrared emissivity of 0.95 in the 8–13 μm wavelength band and a solar reflectivity ≥96%. The material of the subwavelength structure film layer is TiO2. The thickness of the thermal insulation gap is 1.5 mm. The energy storage unit 6 is a 3000 mAh lithium polymer energy storage battery. A USB charging port (not shown in the figure) is provided at the bottom of the umbrella handle 3 for charging the energy storage unit 6 through an external power source.

[0030] In some other embodiments, the passive radiative cooling film is composed of a polymer-based composite cooling coating. The material of the subwavelength structure film layer is a polymer nanostructure. The fan 5 is located at the connection point of the umbrella frame 2 (the connection between the umbrella top and the umbrella handle), and its rated voltage is 3.7V. The thickness of the thermal insulation gap is 3mm.

[0031] The working principle of the solar-driven fan-type double-layer functional membrane composite cooling umbrella of the present invention is as follows: When the Benna parasol is unfolded in the sunlight: (1) Anti-reflection and enhanced light absorption. The subwavelength concave-convex structure (unit size smaller than the visible light wavelength) on the outer surface of the outer film of the umbrella 1 effectively reduces the reflectivity of sunlight on the outer surface of the umbrella, allowing more sunlight to penetrate the outer film and be absorbed by the solar panel 4 laid on the outer surface of the outer film, thereby improving the photoelectric conversion efficiency of the solar panel 4.

[0032] (2) Solar power generation and energy storage. The solar panel 4 converts the absorbed solar energy into electrical energy. After the electrical energy is regulated by the power management module, it can be used to directly power the fan 5, or stored in the energy storage unit 6 inside the umbrella handle 3 for use when there is no sunlight.

[0033] (3) Active air supply for cooling. The user turns on the fan 5 by switching on the power switch 8 on the umbrella handle 3. The fan 5 runs with the air outlet pointing downwards to supply air into the space under the umbrella, which drives the airflow under the umbrella and accelerates the evaporation of sweat on the human body surface, thus achieving active air supply for cooling. The protective net 7 can prevent the user from touching the rotating fan blades and ensure safe use.

[0034] (4) Passive radiation heat dissipation. The cooling film (preferably a passive radiation cooling film) on the inner layer of the umbrella surface 1 absorbs the heat accumulated under the umbrella (including the heat emitted by the human body, the heat reflected from the ground and the thermal radiation in the environment), and converts this heat into infrared radiation in the 8-13μm band. It has a high infrared emissivity and can dissipate the heat under the umbrella in the form of thermal radiation to achieve passive cooling.

[0035] (5) Thermal insulation protection. The thermal insulation gap (thickness of 1-3mm) between the outer membrane and the inner membrane is formed by micro-isolation points. This air gap effectively inhibits the heat conduction between the outer membrane (heated by the sun) and the inner membrane (dissipating heat), preventing the high temperature of the outer membrane from flowing back into the inner membrane and ensuring that the passive radiation cooling effect of the inner membrane is not affected.

[0036] (6) Intelligent power supply management. The power management module automatically switches the power source according to the light conditions: when there is sufficient light, the power generated by the solar panel 4 is given priority to be directly supplied to the fan 5, and the excess power is stored in the energy storage unit 6; when there is insufficient light or no light, the power is automatically switched to be supplied to the fan 5 by the energy storage unit 6 to ensure that the fan 5 continues to operate.

[0037] Through the synergistic effect of multiple mechanisms, including anti-reflection enhancement light absorption, solar power generation and energy storage, active fan air delivery, passive radiation heat dissipation, heat insulation layer thermal blocking, and intelligent power supply management, this invention achieves a highly efficient cooling effect and improves comfort under the umbrella.

[0038] Implementation process description When using the cooling umbrella provided by this invention, the user first unfolds the umbrella, exposing the umbrella surface 1 to sunlight. The solar panel 4 begins to receive sunlight and generate electricity, which is then processed by the power management module and stored in the energy storage unit 6. The user presses the power switch 8 on the umbrella handle 3, and the fan 5 starts, beginning to blow air under the umbrella. When there is sufficient sunlight, the fan 5 can be directly powered by the solar panel 4; when there is insufficient sunlight or at night, the fan 5 is powered by the energy storage unit 6. After use, pressing the power switch 8 again will turn off the fan 5 and close the umbrella.

[0039] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0040] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A solar-powered fan-type double-layer functional membrane composite cooling umbrella, comprising an umbrella canopy (1), an umbrella frame (2), and an umbrella handle (3), characterized in that, The umbrella surface (1) is a double-layer composite structure, including an outer layer film and an inner layer film. The outer layer film is a subwavelength structure film layer with anti-reflection function, and its outer surface has a subwavelength concave-convex structure. The unit size of the concave-convex structure is smaller than the visible light wavelength. A solar panel (4) is laid on the outer surface of the outer layer film. The inner layer film is a cooling film. A fan (5) is installed on the top of the umbrella frame (2), and the air outlet of the fan (5) is arranged downwards; An energy storage unit (6) is installed inside the umbrella handle (3), and the energy storage unit (6) is electrically connected to the solar panel (4) and the fan (5).

2. The solar-powered fan-type double-layer functional membrane composite cooling umbrella according to claim 1, characterized in that, The cooling film is a passive radiation cooling film with an infrared emissivity ≥0.9 in the 8–13 μm band.

3. The solar-powered fan-type double-layer functional membrane composite cooling umbrella according to claim 2, characterized in that, The passive radiation cooling film is composed of hexagonal boron nitride, silicon dioxide / silicon nitride multilayer film, or polymer-based composite cooling coating.

4. The solar-powered fan-type double-layer functional membrane composite cooling umbrella according to claim 1, characterized in that, The material of the subwavelength structure film is SiO2, TiO2, or a polymer nanostructure.

5. A solar-powered fan-type double-layer functional membrane composite cooling umbrella according to claim 1, characterized in that, There is a heat insulation gap between the outer membrane and the inner membrane, which is supported by a plurality of micro-isolation points disposed between the outer membrane and the inner membrane.

6. A solar-powered fan-type double-layer functional membrane composite cooling umbrella according to claim 5, characterized in that, The thickness of the heat insulation gap is 1 to 3 mm.

7. A solar-powered fan-type double-layer functional membrane composite cooling umbrella according to claim 1, characterized in that, The outer cover of the fan (5) is provided with a protective net (7).

8. A solar-powered fan-type double-layer functional membrane composite cooling umbrella according to claim 1, characterized in that, The umbrella handle (3) is also equipped with a power management module. The solar panel (4) and the energy storage unit (6) are electrically connected to the power management module, and the power management module is electrically connected to the fan (5).

9. A solar-powered fan-type double-layer functional membrane composite cooling umbrella according to claim 1, characterized in that, The umbrella handle (3) is equipped with a power switch (8) for controlling the opening and closing of the fan (5).

10. A solar-powered fan-type double-layer functional membrane composite cooling umbrella according to claim 1, characterized in that, The umbrella frame (2) is a hollow structure, and its interior has a channel through which the power supply line passes.

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