Heat dissipation device of automobile atmosphere lamp

Abstract

The heat dissipation device of the automobile atmosphere lamp comprises a vapor chamber, the two sides of the vapor chamber are connected to an LED and a metal substrate respectively, a vacuum cavity is formed in the vapor chamber, a liquid absorption core and a phase change heat conduction working medium are arranged in the vacuum cavity, the liquid absorption core comprises an evaporation liquid absorption core and a condensation liquid absorption core which are oppositely arranged, and the phase change heat conduction working medium is arranged in the evaporation liquid absorption core. A plurality of first grooves are formed in the end face of the side, close to the condensation liquid absorption core, of the evaporation liquid absorption core in an inwards-concave mode, and a plurality of second grooves are formed in the end face of the side, close to the evaporation liquid absorption core, of the condensation liquid absorption core in an inwards-concave mode. The structure is simple, the staggered and intercommunicated grooves are formed in the liquid absorption core, the contact area with a phase change heat conduction working medium is increased, the backflow speed of the phase change heat conduction working medium can be increased, and the heat dissipation efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of automotive electronics technology, and in particular to a heat dissipation device for automotive ambient lights, which is suitable for heat dissipation of vehicle ambient lights. Background Technology

[0002] Ambient lighting in automobiles is a decorative interior lighting system designed to create a personalized atmosphere and enhance the user experience. Under high brightness, prolonged use, or when the interior temperature of the car rises, the LED lights within the ambient lighting often experience light decay and color shift due to increased temperature. To extend their lifespan, a timely and efficient cooling system is needed. Currently, the mainstream cooling system for ambient lighting is a metal substrate connected to the car body structure. The LEDs (light strips or panels, etc.) are mounted on the metal substrate, and the heat generated by the LEDs is conducted to the car body structure through the substrate. This cooling method primarily relies on the heat capacity of the car body structure for passive heat dissipation, resulting in low efficiency. Furthermore, when the ambient temperature is too high, such as when the interior temperature exceeds 70°C in summer, the temperature difference between the metal substrate and the environment decreases, drastically reducing the cooling capacity. Therefore, improvements are needed. Utility Model Content

[0003] The purpose of this invention is to provide a heat dissipation device for automotive ambient lights to overcome the shortcomings of the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] This utility model discloses a heat dissipation device for an automotive ambient light, including a heat spreader plate connected to an LED and a metal substrate on both sides respectively. A vacuum chamber is provided inside the heat spreader plate, and a liquid absorbent core and a phase change heat transfer medium are provided inside the vacuum chamber. The liquid absorbent core includes an evaporation liquid absorbent core and a condensation liquid absorbent core arranged opposite to each other. The evaporation liquid absorbent core has a plurality of first grooves recessed on the end face near the condensation liquid absorbent core, and the condensation liquid absorbent core has a plurality of second grooves recessed on the end face near the evaporation liquid absorbent core.

[0006] Furthermore, in the aforementioned heat dissipation device for automotive ambient lighting, the first groove includes several parallel first horizontal grooves and several parallel first vertical grooves, the first horizontal grooves penetrate the first vertical grooves, and several first protrusions are formed between the first horizontal grooves and the first vertical grooves.

[0007] Furthermore, in the aforementioned heat dissipation device for automotive ambient lighting, the second groove includes several parallel second horizontal grooves and several parallel second vertical grooves, the second horizontal grooves penetrate the second vertical grooves, and several second protrusions are formed between the second horizontal grooves and the second vertical grooves.

[0008] Furthermore, in the aforementioned heat dissipation device for automotive ambient lighting, the first boss and the second boss are arranged alternately.

[0009] Furthermore, in the above-mentioned heat dissipation device for automotive ambient lights, the heat spreader includes a lower housing and an upper housing disposed opposite to each other. The lower housing has a first mounting cavity corresponding to the evaporation liquid absorption core recessed in the end face near the upper housing. The upper housing has a second mounting cavity corresponding to the condensation liquid absorption core recessed in the end face near the lower housing. The LED is disposed at the end of the lower housing away from the first mounting cavity, and the metal substrate is disposed at the end of the upper housing away from the second mounting cavity.

[0010] Furthermore, in the aforementioned heat dissipation device for automotive ambient lighting, the side of the metal substrate facing away from the heat spreader is corrugated.

[0011] Furthermore, in the aforementioned heat dissipation device for automotive ambient lighting, a thermally conductive interface layer is provided between the heat spreader, the LED, and the metal substrate.

[0012] Compared with the prior art, the advantages of this utility model are: the heat dissipation device of the car ambient light has a simple structure, and the liquid absorption core is provided with intersecting grooves to increase the contact area with the phase change heat transfer medium and accelerate the return speed of the phase change heat transfer medium, thereby improving the heat dissipation efficiency. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 The diagram shown is a structural schematic of the heat dissipation device for an automotive ambient light in a specific embodiment of this utility model.

[0015] Figure 2 The image shown is a cross-sectional view of the heat dissipation device for an automotive ambient light in a specific embodiment of this utility model.

[0016] Figure 3 The diagram shown is a structural schematic of the evaporation absorber core in a specific embodiment of this utility model. Detailed Implementation

[0017] The following will describe in detail the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0018] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0019] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0020] Refer Figures 1 to 3 As shown, a heat dissipation device for an automotive ambient light includes a heat pipe with two sides respectively connected to an LED (not shown) and a metal substrate 1. A vacuum cavity is provided inside the heat pipe, and a liquid absorption core and a phase change heat conduction working medium (not shown) are provided inside the vacuum cavity. The liquid absorption core includes an evaporation liquid absorption core 2 and a condensation liquid absorption core 3 arranged opposite to each other. A plurality of first grooves are recessed in the end face of the evaporation liquid absorption core 2 close to the condensation liquid absorption core 3, and a plurality of second grooves are recessed in the end face of the condensation liquid absorption core 3 close to the evaporation liquid absorption core 2.

[0021] In this technical solution, the LED is a conventional light strip, light panel, or integrated automotive ambient light structure. The LED and metal substrate are attached to the corresponding surface of the heat spreader plate using thermally conductive adhesive or bolts. Common phase change heat transfer fluids include anhydrous ethanol, acetone, deionized water, and methanol. An evaporation and condensation heat transfer cores are spaced apart. The liquid phase change heat transfer fluid is immersed in the evaporation heat transfer cores and can flow along the first groove, improving the uniformity of heating of the phase change heat transfer fluid. The heat emitted by the LED is transferred to the evaporation heat transfer cores through the heat spreader plate. The liquid phase change heat transfer fluid inside the liquid core is in a vacuum chamber with a certain degree of vacuum. It can evaporate into a gaseous state at a relatively low temperature. Under the action of pressure difference, the gaseous phase change heat transfer fluid fills the entire vacuum chamber. One end of the heat spreader with the condenser core is connected to an external heat dissipation device, that is, heat is dissipated to the vehicle body through the metal substrate. Therefore, the gaseous phase change heat transfer fluid quickly condenses into a liquid state at the condenser core. The condensed liquid phase change heat transfer fluid flows back to the evaporation core under the action of capillary pressure and gravity of the condenser core, and starts the next evaporation-condensation cycle.

[0022] For example, see Figure 2 and Figure 3 As shown, the first groove includes several parallel first transverse grooves and several parallel first longitudinal grooves. The first transverse grooves penetrate the first longitudinal grooves, and several first protrusions are formed between the first transverse grooves and the first longitudinal grooves.

[0023] In this technical solution, the first groove increases the contact area between the evaporation wick and the liquid phase change heat transfer medium. At the same time, the liquid phase change heat transfer medium can flow along the first groove, improving the uniformity of heating of the phase change heat transfer medium and the evaporation wick. The first horizontal groove and the first vertical groove are conventional straight grooves or wavy grooves, etc. The first horizontal groove and the first vertical groove are interconnected to improve capillary performance.

[0024] For example, see Figure 2 and Figure 3 As shown, the second groove includes several parallel second transverse grooves and several parallel second longitudinal grooves. The second transverse grooves penetrate the second longitudinal grooves, and several second protrusions are formed between the second transverse grooves and the second longitudinal grooves.

[0025] In this technical solution, the condensation wick and the evaporation wick have similar structures and are arranged at intervals relative to each other. The second groove increases the contact area between the condensation wick and the gaseous phase change heat transfer medium. At the same time, the gaseous phase change heat transfer medium can flow along the second groove, improving the uniformity of heating of the condensation wick and the phase change heat transfer medium.

[0026] For example, see Figure 2 and Figure 3 As shown, the first boss and the second boss are staggered.

[0027] In this technical solution, the corresponding first and second grooves in the condensation wicking core and the evaporation wicking core are staggered, and the corresponding first and second protrusions can also be staggered. The gaseous phase change heat transfer medium evaporating above the first protrusion and the liquid phase change heat transfer medium condensing below the second protrusion quickly enter the corresponding first and second grooves and flow, thereby improving the uniformity of heating of the phase change heat transfer medium, the condensation wicking core and the evaporation wicking core, and improving the heat dissipation effect.

[0028] For example, see Figure 1 and Figure 2 As shown, the heat spreader includes a lower housing 4 and an upper housing 5 arranged opposite to each other. The lower housing 4 has a first mounting cavity corresponding to the evaporation liquid absorption core 2 recessed on the end face near the upper housing 5. The upper housing 5 has a second mounting cavity corresponding to the condensation liquid absorption core 3 recessed on the end face near the lower housing 4. The LED is disposed at the end of the lower housing 4 away from the first mounting cavity, and the metal substrate 1 is disposed at the end of the upper housing 5 away from the second mounting cavity.

[0029] In this technical solution, the upper and lower shells are sealed together, and the first and second mounting cavities form corresponding vacuum cavities. The evaporation and condensation suction cores are installed in the corresponding first and second mounting cavities by means of embedding, etc. The upper and lower shells are sealed together. A phase change heat transfer medium is injected into the formed vacuum cavity, and a vacuum is drawn. The injection of the phase change heat transfer medium and the drawing of a vacuum are both existing technologies. The equipment and corresponding structural settings used are all conventional technologies, and will not be described in detail here.

[0030] For example, see Figure 1 and Figure 2 As shown, the side of the metal substrate 1 facing away from the heat spreader is corrugated.

[0031] In this technical solution, the vehicle body structure at the metal substrate mounting location is in close contact with the corrugated surface, increasing the contact area and improving heat dissipation.

[0032] For example, a thermally conductive interface layer (not shown) is provided between the heat spreader and the LED and the metal substrate 1, respectively.

[0033] In this technical solution, the thermal interface layer is a conventional coating structure or thermally conductive adhesive, which solves the microscopic thermal resistance problem of the corresponding contact surface, improves thermal conductivity, and reduces frictional wear or loosening of the contact surface caused by high-frequency vibration during vehicle operation.

[0034] In summary, the heat dissipation device of this automotive ambient light has a simple structure. The liquid absorption core is equipped with interlocking grooves, which increases the contact area with the phase change heat transfer medium and can accelerate the return flow rate of the phase change heat transfer medium, thereby improving the heat dissipation efficiency.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] The above description is only a specific embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A heat dissipating device for an automotive mood light, characterized by, The device includes a heat spreader plate connected to an LED and a metal substrate on both sides. A vacuum chamber is provided inside the heat spreader plate. A liquid absorber core and a phase change heat transfer medium are provided inside the vacuum chamber. The liquid absorber core includes an evaporation liquid absorber core and a condensation liquid absorber core arranged opposite to each other. The end face of the evaporation liquid absorber core near the condensation liquid absorber core is recessed with a plurality of first grooves. The end face of the condensation liquid absorber core near the evaporation liquid absorber core is recessed with a plurality of second grooves.

2. The heat dissipating device for automotive atmosphere lamp according to claim 1, wherein: The first groove includes several parallel first transverse grooves and several parallel first longitudinal grooves. The first transverse grooves penetrate the first longitudinal grooves, and several first protrusions are formed between the first transverse grooves and the first longitudinal grooves.

3. The heat dissipating device for automotive atmosphere lamp according to claim 2, wherein: The second groove includes several parallel second transverse grooves and several parallel second longitudinal grooves. The second transverse grooves penetrate the second longitudinal grooves, and several second protrusions are formed between the second transverse grooves and the second longitudinal grooves.

4. The heat dissipating device for automotive atmosphere lamp according to claim 3, wherein: The first boss and the second boss are staggered.

5. The heat dissipating device for automotive atmosphere lamp according to claim 1, wherein: The heat spreader includes a lower shell and an upper shell arranged opposite to each other. The lower shell has a first mounting cavity corresponding to the evaporation liquid absorption core recessed on the end face near the upper shell. The upper shell has a second mounting cavity corresponding to the condensation liquid absorption core recessed on the end face near the lower shell. The LED is disposed at the end of the lower shell away from the first mounting cavity. The metal substrate is disposed at the end of the upper shell away from the second mounting cavity.

6. The heat dissipating device for automotive atmosphere lamp according to claim 1, wherein: The side of the metal substrate facing away from the heat spreader is corrugated.

7. The heat dissipating device for automotive atmosphere lamp according to claim 1, wherein: A thermally conductive interface layer is provided between the heat spreader, the LED, and the metal substrate.

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