Heat dissipation structure for flashlight of smart watch and smart watch

Abstract

The invention relates to the technical field of intelligent watches, in particular to a heat dissipation structure for an intelligent watch flashlight and an intelligent watch. An intelligent watch is exquisite in size and compact in internal space, heat is easy to accumulate when a flashlight is turned on for a long time, lamp bead aging, electronic element aging, software jamming and even function interruption are caused, and use reliability and experience are affected. A microporous vapor chamber with double diversion trenches and through holes is arranged, a piezoelectric ceramic micropump is matched to drive a fluorinated liquid to circulate, a rolled copper heat conduction strip, a graphite diaphragm, a heat conduction gel layer and other components are combined, a titanium alloy shell and heat dissipation holes are utilized to construct a multi-path heat dissipation system, and efficient heat conduction is achieved.

Description

Technical Field

[0001] This invention relates to the field of smartwatch technology, and in particular to a heat dissipation structure for a smartwatch flashlight and a smartwatch. Background Technology

[0002] In outdoor activities such as hiking, camping, and nighttime emergencies, the flashlight function of smartwatches has become an indispensable practical feature for users. Its convenience, eliminating the need to carry additional dedicated lighting equipment, greatly satisfies the immediate lighting needs of outdoor travel. However, in outdoor scenarios, the use of the flashlight function is often more frequent and lasts longer. Smartwatches, limited by requirements for wearing comfort and portability, have an extremely compact overall design with highly compact internal space. Various electronic components and light-emitting elements are densely packed, lacking sufficient heat dissipation redundancy. When the flashlight is on for extended periods, its driver chip and light-emitting elements continuously generate a large amount of heat. The limited internal space makes it difficult to create an effective heat dissipation path, causing heat to accumulate rapidly and be conducted to the smartwatch's core processing unit. This not only accelerates the chip's aging process but also causes a decrease in software smoothness, resulting in operational lag, response delays, and other problems. In severe cases, overheating may even trigger the protection mechanism, causing the flashlight function to shut down. This affects the reliability of outdoor lighting and significantly reduces the overall user experience. Therefore, there is an urgent need to design an efficient heat dissipation structure for smartwatch flashlights. Summary of the Invention

[0003] Therefore, it is necessary to address the above-mentioned shortcomings by providing a heat dissipation structure for a smartwatch flashlight, including a plurality of LEDs, a middle frame, a front shell, and a bottom shell. The front shell and bottom shell are detachably connected to the middle frame. The middle frame has a flashlight hole, and the LEDs are disposed within the flashlight hole. The structure also includes a microporous heat dissipation plate, a first heat-conducting strip, and a second heat-conducting strip. The microporous heat dissipation plate is fixed to the middle frame and includes a first heat-conducting substrate, a clamping plate, and a second heat-conducting substrate. The first heat-conducting substrate is attached to the back of the LEDs, and the second heat-conducting substrate is disposed opposite to the first heat-conducting substrate. The clamping plate is sandwiched between the first and second heat-conducting substrates. The first and second heat-conducting substrates are separated. The first heat-conducting substrate is tightly fitted to the two sides of the clamping plate. Each side of the clamping plate has a first and a second heat-conducting groove that are symmetrical to each other. Coolant is contained in the first and second heat-conducting grooves. The bottom of the first heat-conducting groove has through holes that are evenly spaced and connect the first and second heat-conducting grooves. A piezoelectric ceramic micropump is fixed on the side of the second heat-conducting substrate away from the clamping plate. The piezoelectric ceramic micropump is used to drive the coolant to flow between the first and second heat-conducting grooves. One end of the first heat-conducting strip is fixedly connected to the second heat-conducting substrate and the other end is connected to the front shell. One end of the second heat-conducting strip is fixedly connected to the second heat-conducting substrate and the other end is connected to the bottom shell.

[0004] Preferably, it further includes: a screen disposed on the face shell, a honeycomb foam disposed on the back of the screen, and a graphite film disposed under the honeycomb foam. The middle frame has heat dissipation holes next to the graphite film. The graphite film is connected to the first heat-conducting strip and is used to conduct the heat of the first heat-conducting strip to the outside through the heat dissipation holes.

[0005] Preferably, the first thermally conductive substrate is further provided with a thermally conductive gel layer, which is used to fill the gaps between the plurality of lamp beads and the gaps between the lamp beads and the flashlight hole wall.

[0006] Preferably, the first and second thermally conductive substrates are aluminum-based copper-clad laminates with an infrared radiation coating on their surfaces, and the insulating layer of the aluminum-based copper-clad laminate is a high thermal conductivity epoxy resin.

[0007] Preferably, the coolant is a fluorinated liquid, and the fluorinated liquid is composed of methoxy-nonafluorobutane or nonafluoroisobutyl ether.

[0008] Preferably, the high-frequency current of the piezoelectric ceramic micropump is 1.7MHz or 2.4MHz.

[0009] Preferably, the height of the first and second guide channels is 0.05 mm, the width of the first and second guide channels is 0.05 mm, and the diameter of the through hole is 0.05 mm.

[0010] Preferably, the first and second heat-conducting strips are made of rolled copper.

[0011] Preferably, the front shell, middle frame, and bottom shell are made of titanium alloy.

[0012] The present invention also provides a smartwatch, including any of the above-mentioned heat dissipation structures for a smartwatch flashlight.

[0013] The aforementioned heat dissipation structure for smartwatch flashlights and the smartwatch itself utilize a microporous heat dissipation plate with dual flow channels, a through-hole structure, and a piezoelectric ceramic micropump-driven coolant circulation. Combined with multi-path heat conduction via the first and second heat-conducting strips, this achieves rapid absorption and efficient removal of heat from the LED beads. This improves the heat dissipation efficiency of the smartwatch flashlight's heat dissipation structure, avoids light decay of the LED beads due to high temperatures and aging of surrounding electronic components, and ensures the flashlight's continuous and stable lighting performance and the overall smooth operation of the smartwatch. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a heat dissipation structure for a smartwatch flashlight in one embodiment of the present invention; Figure 2 for Figure 1 The diagram shows a structural schematic from another angle of the embodiment (with the screen hidden); Figure 3 This is an exploded view of a heat dissipation structure for a smartwatch flashlight according to one embodiment of the present invention; Figure 4 This is a schematic diagram of the core component of a heat dissipation structure for a smartwatch flashlight in one embodiment of the present invention; Figure 5 for Figure 4 The diagram shows a structural schematic from another angle of the embodiment shown; Figure 6 for Figure 4 Exploded view of the embodiment shown; Figure 7 This is a schematic diagram of the structure of the heat dissipation structure for a smartwatch flashlight in one embodiment of the present invention; Figure 8 for Figure 7 The illustrated embodiment is shown from another angle.

[0015] Explanation of reference numerals in the attached drawings: 100-LED bead, 200-middle frame, 200a-flashlight hole, 200b-heat dissipation hole, 300-face shell, 400-bottom shell, 500-micro-perforated heat dissipation plate, 510-first thermal conductive substrate, 520-clamping plate, 520a-first flow channel, 520b-second flow channel, 520c-through hole, 530-second thermal conductive substrate, 531-piezoelectric ceramic micro-pump, 600-first thermal conductive strip, 700-second thermal conductive strip, 800-screen, 810-honeycomb foam, 820-graphite film. Detailed Implementation

[0016] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0017] This invention discloses a heat dissipation structure for a smartwatch flashlight, such as... Figures 1-8As shown, the watch includes: several LED beads 100, a middle frame 200, a front shell 300, a bottom shell 400, a microporous heat dissipation plate 500, a first heat-conducting strip 600, and a second heat-conducting strip 700. The middle frame 200 is made of a high thermal conductivity metal, and its edge has flashlight holes 200a adapted for mounting the LED beads 100. Several LED beads 100 are installed in the flashlight holes 200a, with the light-emitting surface of the LED beads 100 facing outwards to achieve the lighting function. A heat dissipation and bonding area is reserved on the back (non-light-emitting surface) of the LED beads 100. The front shell 300 and the bottom shell 400 are assembled to the upper and lower sides of the middle frame 200 by a detachable connection method (such as clips or screws), together forming a sealed cavity for the watch, ensuring that the internal components are protected from external environmental interference. The microporous heat dissipation plate 500 is fixed to the inner wall of the middle frame 200 and is correspondingly arranged on the back of the LED beads 100. The microporous heat spreader 500 includes: a first thermally conductive substrate 510, a clamping plate 520, and a second thermally conductive substrate 530. The first thermally conductive substrate 510 is directly attached to the back of the LED bead 100, forming the initial interface for heat reception. The second thermally conductive substrate 530 is arranged parallel to and opposite to the first thermally conductive substrate 510, with the clamping plate 520 sandwiched between them. The second thermally conductive substrate 530 and the first thermally conductive substrate 510 are respectively tightly attached to the front and back large surfaces of the clamping plate 520. The clamping plate 520 has a first flow channel 520a and a second flow channel 520b that are symmetrically formed on both sides. The first flow channel 520a and the second flow channel 520b are filled with a suitable coolant, and the bottom of the first flow channel 520a has uniformly formed through holes 520. c. Through hole 520c penetrates clamping plate 520 to connect first guide channel 520a and second guide channel 520b, forming a channel for coolant circulation; on the side of second heat-conducting substrate 530 away from clamping plate 520, piezoelectric ceramic micro pump 531 for driving coolant flow is fixed. Under the action of high-frequency current, the piezoelectric ceramic sheet in piezoelectric ceramic micro pump 531 will generate up-and-down mechanical micro vibrations of the same frequency. This vibration is transmitted to the surface of coolant in contact with it through second heat-conducting substrate 530, and will generate "standing waves". Under appropriate vibration amplitude, water droplets at the wave crest will be thrown and pushed to form a closed loop of coolant circulation circuit of second guide channel 520b, through hole 520c and first guide channel 520a. Both the first heat-conducting strip 600 and the second heat-conducting strip 700 are made of highly thermally conductive flexible material to adapt to the irregular space inside the watch. One end of the first heat-conducting strip 600 is fixedly connected to the second heat-conducting substrate 530, and the other end extends and fits tightly against the inner wall of the front shell 300. One end of the second heat-conducting strip 700 is also fixedly connected to the second heat-conducting substrate 530, and the other end fits against the inner wall of the bottom shell 400. The joints between the first heat-conducting strip 600, the second heat-conducting strip 700 and the inner wall of the shell are treated with thermal conductivity enhancement (such as coating with thermally conductive medium and setting hot spots) to eliminate thermal resistance caused by assembly gaps.

[0018] When the flashlight is turned on, the heat generated by the LED 100 is first transferred through its back to the tightly fitted first heat-conducting substrate 510. The first heat-conducting substrate 510, with its high thermal conductivity, quickly diffuses the heat to its surface in contact with the clamping plate 520, and then transfers it to the coolant in the first guide channel 520a. At this time, the piezoelectric ceramic micropump 531 starts, driving the coolant to circulate within the guide channel. The high-temperature coolant, after absorbing heat, flows along the first guide channel 520a, enters the second guide channel 520b through the bottom through-hole, and then interacts with the second... The heat is transferred from the first heat-conducting substrate 530 to the second heat-conducting substrate 530. The second heat-conducting substrate 530 then conducts the received heat in two ways: one way is conducted through the first heat-conducting strip 600 to the front shell 300, where it is naturally cooled by contact with the outside air; the other way is conducted through the second heat-conducting strip 700 to the bottom shell 400, where it is dissipated into the air. Throughout the process, the coolant continuously circulates under the drive of the piezoelectric ceramic micro-pump 531, constantly carrying away the heat generated by the LED bead 100 and dissipating it through multiple paths to achieve dynamic heat dissipation balance. The heat dissipation structure for a smartwatch flashlight provided by this invention uses the piezoelectric ceramic micro-pump 531 to drive the coolant to actively circulate, and combines it with a microporous heat spreader 500 and dual heat-conducting strips to construct a multi-path heat dissipation channel. This efficiently dissipates the heat from the LED bead 100 within the limited space of the smartwatch, effectively preventing light decay of the LED bead 100 and aging of surrounding chips, ensuring the flashlight's continuous lighting performance and the smooth operation of the watch software.

[0019] In one embodiment, such as Figures 1-8As shown, the front shell 300 and the bottom shell 400 are detachably connected to the middle frame 200. The flashlight hole 200a in the middle frame 200 is equipped with an LED 100. The screen 800 is mounted on the inner side of the front shell 300. A honeycomb foam 810 that serves as a buffer and heat conduction aid is attached to the back of the screen 800. A graphite film 820 is attached below the honeycomb foam 810. The middle frame 200 has a heat dissipation hole 200b next to the graphite film 820, and the graphite film 820 is connected to the first heat conduction strip 600. One end of the first heat conduction strip 600 is connected to the second heat conduction substrate 530, and the other end is attached to the front shell 300 and connected to the graphite film 820. Each attachment point is coated with a heat conduction medium to eliminate gap thermal resistance. When the flashlight is turned on, the heat generated by the LED bead 100 is first transferred to the tightly bonded first heat-conducting substrate 510. The first heat-conducting substrate 510 diffuses the heat to the coolant in the first guide channel 520a. The piezoelectric ceramic micropump 531 starts to drive the coolant to circulate in the first guide channel 520a and the second guide channel 520b. The high-temperature coolant that absorbs heat enters the second guide channel 520b through the through hole 520c at the bottom of the first guide channel 520a and transfers the heat to the second heat-conducting substrate 530. The thermally conductive substrate 530 conducts heat through multiple pathways. One pathway involves partial conduction through the first thermally conductive strip 600 to the surface shell 300 for natural heat dissipation. Another pathway involves transfer through the first thermally conductive strip 600 to the graphite film 820. The graphite film 820, with its high in-plane thermal conductivity, rapidly and evenly dissipates heat before directly dissipating it to the outside through the heat dissipation holes 200b in the middle frame 200. Simultaneously, the second thermally conductive substrate 530 conducts heat to the bottom shell 400 through the second thermally conductive strip 700, where heat dissipation is achieved through convection between the bottom shell 400 and the air. The graphite film 820 has a layered crystal structure, with carbon atoms tightly packed in the same plane by strong covalent bonds, and the layers connected only by weak van der Waals forces. This structure determines a significant difference in thermal conductivity between its in-plane (parallel to the layered structure direction) and out-of-plane (perpendicular to the layered structure direction), resulting in anisotropy in heat transfer.When the first heat-conducting strip 600 transfers heat from the second heat-conducting substrate 530 to the graphite film 820, the graphite film 820, with its high in-plane thermal conductivity, allows locally concentrated heat to diffuse rapidly within its plane. Heat is primarily carried by phonons, and supported by strong covalent bonds within the layer, phonon propagation resistance is low and speed is high. This allows the locally high temperature at the contact point of the first heat-conducting strip 600 to be evenly distributed across the entire film surface in a very short time, preventing heat accumulation at a single contact point. Simultaneously, although the out-of-plane thermal conductivity of the graphite film 820 is relatively low, Because the graphite film 820 is extremely thin (the thickness of the space suitable for watches is usually 0.05-0.1mm), the out-of-plane thermal resistance can be controlled within a low range. In addition, the graphite film 820 and the heat dissipation hole 200a of the mid-frame 200 are precisely aligned. The evenly distributed heat can be efficiently conducted to the heat dissipation hole 200a in the out-of-plane direction and finally directly discharged to the outside of the watch. Furthermore, although the honeycomb foam 810 on the back of the screen 800 is mainly for cushioning and protection, it can also isolate the screen 800 from the graphite film 820 to avoid mutual interference between the two heat sources.

[0020] The graphite film 820 rapidly and evenly distributes heat from point to surface within the compact space of the smartwatch, significantly increasing the heat dissipation area. Compared to the localized heat conduction of traditional metal heat sinks, the heat diffusion efficiency is improved by 3-5 times, effectively preventing aging of the contact area of ​​the first heat conduction strip 600 due to high temperatures. Secondly, the relatively low thermal conductivity on the outer surface creates a "directional heat conduction" effect, with heat mainly transferred along the outer direction to the heat dissipation hole 200a, reducing reverse heat conduction towards the screen 800 and preventing abnormal brightness or response delays on the screen 800 due to heat. Finally, while maintaining an ultra-thin shape, the graphite film 820 combines heat dissipation and directional heat dissipation functions, complementing the coolant circulation and dual heat conduction strips to further improve the efficiency of the overall heat dissipation system, ensuring that the LED bead 100 operates at a stable and safe temperature, extending its service life and ensuring smooth operation of the watch software.

[0021] In one embodiment, a thermally conductive gel layer is provided on the side of the first thermally conductive substrate 510 facing the lamp bead 100. The thermally conductive gel layer fills the gap between a plurality of lamp beads 100 and tightly fills the gap between the lamp bead 100 and the wall of the flashlight hole 200a, thereby achieving a seamless thermally conductive connection between the lamp bead 100 and the first thermally conductive substrate 510 and the wall of the flashlight hole 200a. The first thermally conductive substrate 510 is attached to the back of the lamp bead 100 and the thermally conductive gel layer. When the flashlight is turned on, the heat generated by the LED beads 100 is transferred omnidirectionally through the back and sides. The heat from the sides is rapidly conducted through the thermally conductive gel layer, which fills the gaps between the LED beads 100 and between the LED beads 100 and the wall of the flashlight hole 200a, completely eliminating air thermal resistance. This allows part of the heat generated by the LED beads 100 to be directly conducted to the middle frame 200, while the other part is concentrated on the first thermally conductive substrate 510, preventing localized heat accumulation. The heat from the back of the LED beads 100 is directly transferred to the first thermally conductive substrate 510. Subsequently, the first thermally conductive substrate 510 diffuses all the collected heat into the coolant in the first guide channel 520a. The subsequent heat transfer path is the same as in the aforementioned embodiment and will not be described in detail here. The thermally conductive gel layer reduces heat accumulation in the gaps between the LED beads 100 and between the LED beads 100 and the wall of the flashlight hole 200a, further improving heat transfer efficiency.

[0022] In one embodiment, the first thermally conductive substrate 510 and the second thermally conductive substrate 530 are aluminum-based copper-clad laminates with infrared radiation coatings sprayed on their surfaces. The insulating layer of the aluminum-based copper-clad laminate is made of high thermal conductivity epoxy resin. The copper foil layer can be etched to form a simple circuit, eliminating the need for an additional independent circuit board. This saves space within the compact interior of the smartwatch and reduces the assembly gap between the circuit and the heat dissipation substrate. The high thermal conductivity epoxy resin insulating layer reduces the internal thermal resistance of the aluminum-based copper-clad laminate, and the infrared radiation coating adds a radiation heat dissipation path. The combination of these two elements with the structural advantages of the aluminum-based copper-clad laminate further improves the overall heat exchange efficiency of the heat dissipation structure.

[0023] In one embodiment, the coolant in the microporous heat spreader 500 is a fluorinated liquid, the composition of which is methoxy-nonafluorobutane or nonafluoroisobutyl ether. These two fluorinated liquids achieve heat transfer through liquid flow, and heat dissipation is completed by combining the structural design of the microporous heat spreader with the driving action of the piezoelectric ceramic micropump 531. These two fluorinated liquids have excellent liquid thermal conductivity and extremely low viscosity at room temperature, allowing them to flow smoothly within the narrow first guide groove 520a, second guide groove 520b, and through hole 520c of the clamping plate 520. When the heat generated by the LED bead 100 is transferred to the first thermally conductive substrate 510, the heat is rapidly conducted to the fluorinated liquid in close contact with the first thermally conductive substrate 510. The piezoelectric ceramic micropump 531 drives the heated fluorinated liquid to flow along the first guide groove 520a, and through the through hole 520c at the bottom of the groove into the second guide groove 520b. During the flow process, the high-temperature fluorinated liquid fully contacts the second thermally conductive substrate 530. The heat carried is transferred to the second thermally conductive substrate 530, and then the cooled fluorinated liquid flows back to the first guide channel 520a under the drive of the piezoelectric ceramic micro pump 531, forming a continuous liquid circulation heat conduction path. At the same time, these two fluorinated liquids have high insulation properties, and their dielectric strength and volume resistivity meet the safety requirements of the densely arranged electronic components inside the watch. Even if there is a slight leakage, it will not cause a short circuit. Its chemical inertness is extremely strong, and it will not corrode or swell with the aluminum-based copper-clad plate of the microporous heat spreader 500, the clamping plate 520, the piezoelectric ceramic micro pump 531, and the surrounding thermally conductive gel layer, graphite film 820 and other components, ensuring the long-term stable operation of the structure. Moreover, its low viscosity characteristics are suitable for the low power drive requirements of the piezoelectric ceramic micro pump 531, and will not increase the energy consumption burden of the watch. The fluorinated liquid uses methoxy-nonafluorobutane or nonafluoroisobutyl ether, which can not only achieve stable heat dissipation of the LED beads, but also ensure the safety and long-term effectiveness of the heat dissipation structure, while reducing the energy consumption of the piezoelectric ceramic micro pump 531, thus improving the continuous working stability and battery life of the smartwatch flashlight.

[0024] In one embodiment, the piezoelectric ceramic micropump 531 is driven by a high-frequency current of 1.7MHz or 2.4MHz. This high-frequency current causes the piezoelectric ceramic element inside the piezoelectric ceramic micropump 531 to generate high-frequency mechanical vibration. This vibration is transmitted to the pump body structure of the piezoelectric ceramic micropump 531, which can generate a high-frequency pulse thrust on the fluorinated liquid in the guide groove of the microporous heat spreader 500. With the driving effect of the high-frequency vibration, the flow rate of the fluorinated liquid in the narrow first guide groove 520a and second guide groove 520b is greatly improved, and the flow process is more uniform and stable. This avoids the stagnation or local eddy current phenomenon that may occur under low-frequency drive, ensuring the cooling liquid is properly controlled. The heated fluorinated liquid can quickly flow from the first guide channel 520a through the through hole into the second guide channel 520b, and fully contact the second heat-conducting substrate 530 to complete heat exchange. Subsequently, the cooled fluorinated liquid can quickly flow back to the first guide channel 520a, forming an efficient and continuous liquid circulation heat conduction path. At the same time, the high-frequency driving mode of 1.7MHz or 2.4MHz matches the inherent frequency of the piezoelectric ceramic element of the piezoelectric ceramic micropump 531, realizing the efficient conversion of driving energy, improving the heat transfer efficiency of the heat dissipation structure, and reducing the energy consumption of the piezoelectric ceramic micropump 531, thus ensuring the stability and battery life of the smartwatch flashlight.

[0025] In one embodiment, the height and width of the first guide channel 520a and the second guide channel 520b are both 0.05mm, and the diameter of the through hole 520c is also set to 0.05mm. This equal-size design is highly compatible with the low viscosity characteristics of the fluorinated liquid and the high-frequency driving mode of the piezoelectric ceramic micropump 531. On the one hand, the narrow channel size significantly increases the contact area between the fluorinated liquid and the inner wall of the first guide channel 520a, allowing the heat transferred by the first thermally conductive substrate to be absorbed by the fluorinated liquid more quickly through the inner wall of the first guide channel 520a. At the same time, the uniformly distributed equal-diameter through holes 520c ensure a smooth flow path of the fluorinated liquid between the guide channels, avoiding local blockage or... In cases of uneven flow, the miniaturized design maximizes the reduction of the overall thickness of the microporous heat spreader 500, perfectly fitting the compact internal space of a smartwatch. It avoids occupying additional component installation space due to the addition of a flow guiding structure. Combined with a piezoelectric ceramic micropump 531 driven by a 1.7MHz or 2.4MHz high-frequency current, the low-viscosity fluorinated liquid maintains a stable and efficient flow state within the tiny flow channels, achieving rapid heat transfer and exchange. This ensures that the heated fluorinated liquid flows promptly from the first flow channel 520a into the second flow channel 520b for heat dissipation, and the cooled fluorinated liquid quickly flows back to form a closed-loop heat conduction circuit. The size design of the first flow channel 520a, the second flow channel 520b, and the through-hole 520c in this embodiment significantly increases the contact area between the fluorinated liquid and the channel walls and improves flow stability. This reduces the volume of the microporous heat spreader 500, fitting the compact space of the smartwatch, and combined with the high-frequency piezoelectric ceramic micropump 531 drive for efficient heat dissipation, ensuring continuous and stable operation of the flashlight.

[0026] In one embodiment, the first heat-conducting strip 600 and the second heat-conducting strip 700 are made of rolled copper. Rolled copper has extremely high thermal conductivity and good flexibility. Its dense copper crystal structure can significantly reduce the thermal resistance during heat transfer, allowing the heat on the second heat-conducting substrate 530 to be quickly and evenly conducted to the front shell 300 and the back shell 400. At the same time, its flexibility allows the first heat-conducting strip 600 and the second heat-conducting strip 700 to fit tightly against the irregular assembly surfaces inside the smartwatch, eliminating the contact gap between the heat-conducting strip and the substrate and shell, and avoiding the impact of air thermal resistance on heat dissipation efficiency. In addition, rolled copper has excellent chemical stability and will not corrode with surrounding aluminum-based copper-clad laminates, graphite films, thermal conductive gels and other components, and can maintain stable thermal conductivity for a long time, adapting to the complex working environment and thin and light structural requirements inside the watch.

[0027] In one embodiment, the front shell 300, middle frame 200, and bottom shell 400 are made of titanium alloy. Titanium alloy has high strength, low density, and good thermal conductivity. Its moderate thermal conductivity can efficiently absorb the heat transferred by the first heat conduction strip 600 and the second heat conduction strip 700, and achieve rapid heat dissipation through the contact between the shell surface and the air. At the same time, the high strength of titanium alloy ensures that the watch shell still has excellent impact resistance and deformation resistance under the thin and light design, which is suitable for the collision and squeezing scenarios of daily wear. Moreover, titanium alloy has extremely strong chemical stability and is not easy to oxidize or corrode with air and sweat. It can maintain the structural integrity and thermal conductivity stability of the shell for a long time, and avoid the failure of the heat dissipation path due to shell corrosion. It works together with the internal microporous heat dissipation plate 500, the first heat conduction strip 600, and the second heat conduction strip 700 to form a complete heat dissipation link from the heat source to the external environment.

[0028] The present invention also provides a smartwatch that uses the aforementioned heat dissipation structure for a smartwatch flashlight.

[0029] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0030] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A heat dissipation structure for a smartwatch flashlight, comprising a plurality of LED beads (100), a middle frame (200), a front shell (300), and a bottom shell (400), wherein the front shell (300) and the bottom shell (400) are detachably connected to the middle frame (200), the middle frame (200) has a flashlight hole (200a), and the LED beads (100) are disposed within the flashlight hole (200a), characterized in that, include: A microporous heat spreader (500), a first heat-conducting strip (600), and a second heat-conducting strip (700) are provided. The microporous heat spreader (500) is fixed to the middle frame (200). The microporous heat spreader (500) includes: a first heat-conducting substrate (510), a clamping plate (520), and a second heat-conducting substrate (530). The first heat-conducting substrate (510) is attached to the back of the LED bead (100). The second heat-conducting substrate (530) is disposed opposite to the first heat-conducting substrate (510). The clamping plate (520) is sandwiched between the first heat-conducting substrate (510) and the second heat-conducting substrate (530). The first heat-conducting substrate (510) and the second heat-conducting substrate (530) are respectively tightly attached to the front and back surfaces of the clamping plate (520). The front and back surfaces of the clamping plate (520) are each provided with a first guide groove (520a) and a second guide groove (520) that are symmetrical to each other. (b) Coolant is provided in the first guide channel (520a) and the second guide channel (520b). The bottom of the first guide channel (520a) is provided with through holes (520c) at even intervals. The through holes (520c) connect the first guide channel (520a) and the second guide channel (520b). A piezoelectric ceramic micropump (531) is fixed on the side of the second thermal conductive substrate (530) away from the clamping plate (520). The piezoelectric ceramic micropump (531) is used to drive the coolant to flow between the first guide channel (520a) and the second guide channel (520b). One end of the first thermal conductive strip (600) is fixedly connected to the second thermal conductive substrate (530) and the other end is connected to the face shell (300). One end of the second thermal conductive strip (700) is fixedly connected to the second thermal conductive substrate (530) and the other end is connected to the bottom shell (400).

2. The heat dissipation structure for a smartwatch flashlight according to claim 1, characterized in that, Also includes: The screen (800) is disposed on the face shell (300), the honeycomb foam (810) is disposed on the back of the screen (800), and the graphite film (820) is disposed under the honeycomb foam (810). The middle frame (200) has a heat dissipation hole (200b) next to the graphite film (820). The graphite film (820) is connected to the first heat-conducting strip (600) and is used to conduct the heat of the first heat-conducting strip (600) to the outside through the heat dissipation hole (200b).

3. The heat dissipation structure for a smartwatch flashlight according to claim 1, characterized in that, The first thermally conductive substrate (510) is further provided with a thermally conductive gel layer, which is used to fill the gaps between a plurality of the lamp beads (100) and the gaps between the lamp beads (100) and the wall of the flashlight hole (200a).

4. The heat dissipation structure for a smartwatch flashlight according to claim 1, characterized in that, The first thermally conductive substrate (510) and the second thermally conductive substrate (530) are aluminum-based copper-clad laminates with infrared radiation coatings sprayed on their surfaces, and the insulating layer of the aluminum-based copper-clad laminates is a high thermal conductivity epoxy resin.

5. The heat dissipation structure for a smartwatch flashlight according to claim 1, characterized in that, The coolant is a fluorinated liquid, and the components of the fluorinated liquid are methoxy-nonafluorobutane or nonafluoroisobutyl ether.

6. The heat dissipation structure for a smartwatch flashlight according to claim 1, characterized in that, The piezoelectric ceramic micropump (531) operates at a high-frequency current of 1.7MHz or 2.4MHz.

7. The heat dissipation structure for a smartwatch flashlight according to claim 1, characterized in that, The height of the first guide groove (520a) and the second guide groove (520b) is 0.05mm, the width of the first guide groove (520a) and the second guide groove (520b) is 0.05mm, and the diameter of the through hole (520c) is 0.05mm.

8. The heat dissipation structure for a smartwatch flashlight according to claim 1, characterized in that, The first heat-conducting strip (600) and the second heat-conducting strip (700) are made of rolled copper.

9. The heat dissipation structure for a smartwatch flashlight according to claim 1, characterized in that, The front shell (300), middle frame (200), and bottom shell (400) are made of titanium alloy.

10. A smartwatch, characterized in that, Includes the heat dissipation structure for a smartwatch flashlight as described in any one of claims 1-9.

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