LED automobile lamp adopting annular heat pipe for heat dissipation
By integrating the annular heat pipe with the inner wall of the lamp body's heat dissipation shell and using a light-blocking strip design, the problem of poor heat dissipation in LED automotive lights has been solved, achieving an LED automotive light design that is efficient in heat dissipation and flexible in adapting to different driving habits.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- EASDAR OPTOELECTRONICS (GUANGDONG) CO LTD
- Filing Date
- 2025-07-30
- Publication Date
- 2026-05-26
AI Technical Summary
In existing LED automotive lights, the contact between the heat pipe and the LED light source board is only partial, failing to fully utilize the heat dissipation area of the metal heat sink casing, resulting in limited heat dissipation effect.
The ring-shaped heat pipe is embedded in the groove of the inner wall of the lamp body heat dissipation shell to increase the contact area. It is combined with the detachable design of the light-blocking strip to adapt to different driving habits, and combines forced air cooling and natural convection heat dissipation.
This design achieves large-area contact between the heat pipe and the lamp housing, improving heat dissipation efficiency, adapting to different driving habits, simplifying maintenance and replacement processes, and enhancing user satisfaction and product flexibility.
Smart Images
Figure CN224284309U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automotive lighting technology, and in particular to an LED automotive lamp that uses a ring-shaped heat pipe for heat dissipation. Background Technology
[0002] With the rapid development of the automotive industry and the continuous improvement of LED luminous efficacy, LED technology is being used more and more widely in automotive lighting due to its advantages such as high brightness, low energy consumption, long lifespan and fast response time.
[0003] Currently, most LED automotive lights on the market use a combination of metal heat sink casings, cooling fans, and heat pipes to dissipate heat from the LED light source board, such as the high thermal conductivity automotive LED light shown in patent number 201922373093.3. However, in practice, it has been found that the heat pipes used in this type of LED automotive light mostly only make partial contact with the LED light source board, failing to fully utilize the heat dissipation area of the metal heat sink casing, resulting in limited heat dissipation effect. Utility Model Content
[0004] The purpose of this invention is to address the shortcomings of existing LED automotive lights, such as the limited heat dissipation effect caused by the fact that the heat pipes used in most LED automotive lights only make partial contact with the LED light source board and do not fully utilize the heat dissipation area of the metal heat sink, thus resulting in limited heat dissipation effect. Therefore, this invention proposes an LED automotive light that uses a ring-shaped heat pipe for heat dissipation.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] Design an LED automotive lamp with an annular heat pipe for heat dissipation, including a lamp body heat dissipation shell 1 and a lens 2 disposed on the front end of the lamp body heat dissipation shell 1. The lamp body heat dissipation shell 1 has an LED light source board 3, a PCB driver board 4 and a heat dissipation component 5 arranged sequentially from front to back. A heat pipe 6 is attached to the LED light source board 3. The condensation end 61 of the heat pipe 6 has an annular structure. The inner wall of the lamp body heat dissipation shell 1 is recessed with a groove 11 for the condensation end 61 to be embedded therein. The evaporation end 62 of the heat pipe 6 is disposed on the LED light source board 3. The lamp body heat dissipation shell 1 has a first opening 12 for the LED beads 31 on the LED light source board 3 to be exposed. The first opening 12 has a reflector 7 covering the LED beads 31 and the light outlet facing the lens 2. A light-blocking strip 8 is detachably provided on the first opening 12 above the light outlet of the reflector 7.
[0007] Furthermore, the PCB driver board 4 has a slot 41 for inserting the rear end of the LED light source board 3, wherein the PCB driver board 4 is arranged horizontally and the LED light source board 3 is arranged vertically.
[0008] Furthermore, the heat dissipation component 5 includes a fan fixing member 51 disposed inside the rear end of the lamp body heat dissipation housing 1, the fan fixing member 51 is provided with a heat dissipation fan 52, and the top of the fan fixing member 51 is provided with ventilation openings 53 that communicate with the interior of the lamp body heat dissipation housing 1.
[0009] Furthermore, the lamp body heat dissipation housing 1 includes a first housing body 13 and a second housing body 14 that are left and right overlapping each other. The length of the first housing body 13 is shorter than that of the second housing body 14. The first opening 12 is formed between the front end of the first housing body 13 and the front end of the second housing body 14. The front end of the second housing body 14 is provided with a lens fixing member 141 for fixing the lens 2 therein. The light blocking strip 8 is disposed on the second housing body 14 and located between the reflector cup 7 and the lens 2.
[0010] Furthermore, the second outer shell body 14 has a second opening 142, and the rear edge of the second opening 142 is flush with the light-blocking strip 8.
[0011] Furthermore, a chuck 9 is fitted onto the lamp body heat dissipation housing 1 and fixedly connected to the headlight assembly, and a sealing ring 91 is provided between the chuck 9 and the lamp body heat dissipation housing 1.
[0012] Furthermore, the lamp body heat dissipation shell 1 is an integrated or separate structure made of heat dissipation aluminum or heat dissipation copper material by die casting or extrusion molding.
[0013] Furthermore, the evaporation end 62 is welded to the back of the LED light source board 3, and / or the evaporation end 62 is welded to the side end of the LED light source board 3.
[0014] The LED automotive light using a ring-shaped heat pipe for heat dissipation proposed in this utility model has the following advantages:
[0015] In this utility model, the heat dissipation shell of the lamp body achieves large-area contact between the heat pipe and the heat dissipation shell by the embedded cooperation between the inner wall groove and the condensation end of the heat pipe, so as to eliminate the local thermal resistance caused by traditional point contact and achieve efficient heat dissipation.
[0016] Secondly, the detachable design of the light-blocking strip in this invention makes maintenance and replacement simple and quick, without the need for professional tools or complicated operations. Users can easily replace the light-blocking strip as needed to adapt to driving habits in different countries and regions, whether it is left-hand drive or right-hand drive, thereby improving the product's flexibility and user satisfaction. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of an LED automotive lamp using a ring-shaped heat pipe for heat dissipation, as proposed in this utility model.
[0018] Figure 2 for Figure 1 The diagram shows an exploded view of an LED automotive light that uses a ring-shaped heat pipe for heat dissipation.
[0019] In the diagram: 1. Lamp body heat dissipation shell; 11. Groove; 12. First opening; 13. First shell body; 14. Second shell body; 141. Lens fixing component; 142. Second opening; 2. Lens; 3. LED light source board; 31. LED lamp bead; 4. PCB driver board; 41. Slot; 5. Heat dissipation component; 51. Fan fixing component; 52. Cooling fan; 53. Vent; 6. Heat pipe; 61. Condensation end; 62. Evaporation end; 7. Reflector; 8. Light blocking strip; 9. Chuck; 91. Sealing ring. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0021] Reference Figure 1 and Figure 2An LED automotive lamp employing a ring-shaped heat pipe for heat dissipation includes a lamp body heat dissipation shell 1 and a lens 2 fixed to the front end of the lamp body heat dissipation shell 1 via a snap-fit structure. Inside the lamp body heat dissipation shell 1 are arranged sequentially from front to back an LED light source board 3, a PCB driver board 4, and a heat dissipation assembly 5. A heat pipe 6 is attached to the LED light source board 3. The condensation end 61 of the heat pipe 6 has a ring-shaped structure. A groove 11 is recessed on the inner wall of the lamp body heat dissipation shell 1 for the condensation end 61 to be embedded therein, allowing the ring-shaped condensation end 61 to fit tightly against the groove 11 on the inner wall of the lamp body heat dissipation shell 1. This effectively increases the contact area between the two, improves heat conduction efficiency, and allows heat to be transferred more quickly from the heat pipe 6 to the lamp body heat dissipation shell 1. The evaporation end 62 of the heat pipe 6 is located attached to the LED light source board 3 to ensure that the heat pipe 6 can absorb the heat generated by the LED light source board 3 in a timely and effective manner, thus improving the working efficiency of the LED light source board 3. To maintain the temperature within a reasonable range, the lamp body heat dissipation housing 1 has a first opening 12 for the LED beads 31 on the LED light source board 3 to be exposed, providing a channel for the light to be emitted from the LED beads 31, and providing a mounting position for the reflector cup 7 and the light-blocking strip 8. The first opening 12 has a reflector cup 7 covering the LED beads 31 with the light outlet facing the lens 2, so as to reflect and focus the light emitted by the LED beads 31, improve the utilization rate of light and the lighting effect, and enable the light to shine out in a predetermined direction and angle. The first opening 12 can also be detachably equipped with a light-blocking strip 8 located above the light outlet of the reflector cup 7. The light-blocking strip 8 is specifically set on the upper edge of the opening 12, and its bottom stepped light-blocking teeth can physically block the light. When the light passes through, the light-blocking teeth intercept stray light higher than the design angle. At the same time, the position of the cutoff line can be changed by adjusting the height of the light-blocking strip to adapt to the regulatory requirements of different vehicle models.
[0022] In this invention, the lamp body heat dissipation shell 1 achieves large-area contact between the heat pipe 6 and the condensation end 61 of the heat pipe 6 through the embedded cooperation of the inner wall groove 11. This eliminates the local thermal resistance caused by traditional point contact, allowing the heat from the LED light source board 3 to be conducted to the condensation end 61 through the evaporation end 62. The heat from the condensation end 61 can then be directly conducted to the entire lamp body heat dissipation shell 1 through the metal of the inner wall of the groove 11. Finally, heat dissipation is achieved through convection-radiation coupling between the surface of the lamp body heat dissipation shell 1 and the air. Furthermore, the exterior of the lamp body heat dissipation shell 1 can be designed with gradient heat dissipation fins to achieve multi-mode heat dissipation through natural convection or forced air cooling.
[0023] Furthermore, in this invention, the LED beads 31 on the LED light source board 3 generate a large amount of heat during operation. The evaporation end 62 of the heat pipe 6 is in close contact with the LED light source board 3, enabling it to quickly absorb the heat generated by the LED light source board 3. This causes the working medium inside the heat pipe to evaporate into steam. Under the action of a small pressure difference inside the heat pipe, the steam flows to the condensation end 61. The condensation end 61 is embedded in the groove 11 on the inner wall of the lamp body heat dissipation shell 1, transferring heat to the lamp body heat dissipation shell 1 and condensing it into liquid. The condensed liquid, under the action of the capillary structure inside the heat pipe, flows back to the evaporation end 62 to continue participating in the heat transfer process, achieving efficient heat dissipation.
[0024] Furthermore, in this invention, the light-blocking strip 8 can be either a left or right light-blocking strip. The design and size of these two strips may differ slightly to accommodate driving habits in different countries or regions, i.e., whether the steering wheel is located on the left or right side of the vehicle. The specific strip used depends on the steering wheel position. When the car is designed for left-hand drive (with the steering wheel on the right), a left light-blocking strip should be installed to ensure that the light does not directly illuminate oncoming drivers, thus reducing glare and improving road safety. Conversely, when the car is designed for right-hand drive (with the steering wheel on the left), a right light-blocking strip should be installed to achieve the same safety purpose. By providing both left and right light-blocking strips, this design can adapt to driving habits in different countries and regions, regardless of whether the car is left-hand or right-hand drive. Simultaneously, the detachable design of the light-blocking strip 8 makes maintenance and replacement simple and quick, requiring no special tools or complex operations. Users can easily replace the light-blocking strip as needed, improving product flexibility and user satisfaction. Through this design, LED automotive lights can better adapt to the needs of different markets while ensuring a safe and comfortable lighting experience under various driving conditions.
[0025] Furthermore, in this embodiment, as Figure 2 As shown, the PCB driver board 4 has a slot 41 for the rear end of the LED light source board 3 to be inserted into, so as to achieve a more stable electrical connection between the two. Compared with the traditional wire connection method, this insertion method can reduce the risk of loosening and poor contact at the connection point, ensuring that the LED light source board can stably obtain power and signals from the PCB driver board, thereby improving the working reliability of the LED automotive lamp. The PCB driver board 4 is horizontally arranged, and the LED light source board 3 is vertically arranged. In this invention, within the limited space inside the automotive lamp, this design can make full use of the space, allowing the PCB driver board 4 and the LED light source board 3 to be installed more compactly, reducing the overall volume and leaving more space for the installation of other components and the arrangement of heat dissipation components, which is conducive to the miniaturization and integration design of the LED automotive lamp.
[0026] Furthermore, in this invention, when the PCB driver board 4 is powered on, its internal power conversion circuit can convert the voltage and current provided by the automotive power supply into voltage and current suitable for the operation of the LED light source board 3. The rear end of the LED light source board 3 is inserted into the slot 41 of the PCB driver board 4, and the two are electrically connected through metal contacts or conductive pads. Current is transmitted from the PCB driver board 4 through these electrical connection points to the LED beads 31 on the LED light source board 3, causing the LED beads 31 to emit light.
[0027] Furthermore, in this embodiment, as Figure 2 As shown, the heat dissipation assembly 5 includes a fan mounting member 51 disposed inside the rear end of the lamp body heat dissipation housing 1. A cooling fan 52 is housed within the fan mounting member 51. The inwardly protruding design of the fan mounting member 51 more effectively utilizes the space at the rear end of the lamp body heat dissipation housing 1, providing sufficient installation space for the cooling fan 52. It also ensures that the airflow of the fan can smoothly pass through the lamp body heat dissipation housing 1, improving heat dissipation efficiency. Furthermore, the cooling fan 52, through forced convection, accelerates the heat exchange between the lamp body heat dissipation housing 1 and the surrounding air, thereby further improving heat dissipation efficiency. This is particularly important for high-power LED vehicle lights, ensuring that the LED light source maintains a stable operating temperature even after prolonged operation. Ventilation openings 53 are provided around the top of the fan mounting member 51, communicating with the interior of the lamp body heat dissipation housing 1. This allows the cool air drawn in by the cooling fan 52 to directly act on the lamp body heat dissipation housing 1, while simultaneously promoting airflow within the lamp body heat dissipation housing 1, further enhancing the heat dissipation effect.
[0028] Furthermore, in this embodiment, as Figure 2 As shown, the lamp body heat dissipation housing 1 includes a first housing body 13 and a second housing body 14 that are left and right overlapping each other. The first housing body 13 and the second housing body 14 are assembled together by overlapping, making the assembly process of the LED automotive lamp simpler. During the production process, workers can install each component onto the first housing body 13 and the second housing body 14 separately, and then close them together, reducing the complexity and difficulty of assembly. At the same time, during later maintenance or component replacement, the internal components can be easily operated by simply opening the left and right housing bodies, improving maintenance efficiency and reducing maintenance costs. The length of the first housing body 13 is shorter than that of the second housing body 14. A first opening 12 is formed between the front end of the first housing body 13 and the front end of the second housing body 14. The front end of the second housing body 14 is provided with a lens fixing member 141 for fixing the lens 2 therein. A light-blocking strip 8 is disposed on the second housing body 14 and located between the reflector cup 7 and the lens 2.
[0029] In this embodiment, when assembling the LED automotive lamp, the LED light source board 3, PCB driver board 4, heat dissipation component 5, and other components are first installed onto their respective positions on the first housing body 13 and the second housing body 14. Then, the reflector 7 is installed near the first opening 12 at the front end of the first housing body 13, i.e., on the second housing body 14, so that the light emitted by the LED beads 31 can be reflected and shaped by the reflector 7. Next, the lens 2 is installed into the lens holder 141 at the front end of the second housing body 14, ensuring that the lens 2 is accurately positioned. Finally, the light-blocking strip 8 is installed on the second housing body 14, positioned between the reflector 7 and the lens 2, completing the assembly of the entire LED automotive lamp.
[0030] Furthermore, in this embodiment, as Figure 2 As shown, a second opening 142 is provided on the second housing body 14. The rear edge of the second opening 142 is flush with the light-blocking strip 8, which allows for more precise control of the light emission range. Specifically, the light-blocking strip 8 itself limits the angle of light illumination, preventing light from scattering into unwanted areas. The flush alignment of the rear edge of the second opening 142 with the light-blocking strip 8 further strengthens this control over the light boundary, ensuring that light can only exit through the second opening at a designed angle and range. This guarantees that the light illuminating the road ahead is more concentrated and accurate, improving the lighting effect and reducing light waste and glare. Simultaneously, the flush alignment of the rear edge of the second opening 142 with the light-blocking strip 8 does not impede the normal airflow at the opening, helping to create a more efficient heat dissipation airflow circulation, improving heat dissipation efficiency, and ensuring the temperature stability of the LED automotive light during long-term operation.
[0031] Furthermore, in this embodiment, as Figure 1 and 2 As shown, a chuck 9 is fitted onto the lamp body heat dissipation housing 1 and fixedly connected to the headlight assembly. A sealing ring 91 is also provided between the chuck 9 and the lamp body heat dissipation housing 1. During installation, simply fit the lamp body heat dissipation housing 1 into the chuck 9 and connect the chuck 9 to the headlight assembly using appropriate fixing methods (such as bolt fixing, snap fixing, etc.), while ensuring that the sealing ring 91 is in the correct position. This installation method does not require complicated tools and operating procedures, improving installation efficiency. When maintenance or replacement of the LED automotive light is required, the design of the chuck 9 allows for easy removal of the lamp body heat dissipation housing 1 from the chuck for necessary inspection, repair, or replacement of parts. After the operation is completed, the lamp body heat dissipation housing 1 can be refitted into the chuck 9 and fixed in place to restore its use, reducing maintenance difficulty and cost. At the same time, the sealing ring 91 between the chuck 9 and the lamp body heat dissipation housing 1 effectively prevents external dust, moisture, and other impurities from entering the lamp body heat dissipation housing, thereby extending the product's service life.
[0032] Furthermore, in this embodiment, the lamp body heat dissipation housing 1 is an integrated or separate structure made of heat-dissipating aluminum or copper material through die casting or extrusion. This not only improves the overall structural strength and stability but also facilitates rapid heat conduction and dissipation, significantly reducing thermal resistance and assembly errors, and improving heat dissipation efficiency. Simultaneously, aluminum material has excellent thermal conductivity and light weight, ensuring efficient heat dissipation and lightweight design of the vehicle lamp.
[0033] Furthermore, the evaporation end 62 is soldered to the back of the LED light source board 3. This direct back-side contact reduces the heat transfer path and intermediate steps, allowing the evaporation end 62 to more quickly sense temperature changes in the LED light source board 3 and promptly initiate the heat dissipation process. This effectively controls the temperature and protects the LED chip from thermal damage in the face of rapid temperature fluctuations in the LED light source board 3, such as during sudden high-power operation. The evaporation end 62 is soldered to the side of the LED light source board 3, allowing for better integration with other heat dissipation components (such as side-mounted heat sinks and fans) to form a multi-directional heat dissipation system. Through proper design, this further improves heat dissipation efficiency, enhances the overall heat dissipation capacity of the LED automotive light under different operating environments, and adapts to a wider range of automotive applications.
[0034] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.
Claims
1. An LED automobile lamp dissipating heat by using a loop heat pipe, characterized in that, The lamp includes a heat dissipation housing (1) and a lens (2) disposed on the front end of the heat dissipation housing (1). Inside the heat dissipation housing (1) are arranged an LED light source board (3), a PCB driver board (4), and a heat dissipation assembly (5) arranged sequentially. A heat pipe (6) is attached to the LED light source board (3). The condensation end (61) of the heat pipe (6) has an annular structure. A groove (11) is recessed on the inner wall of the heat dissipation housing (1) for the condensation end (61) to be embedded therein. The evaporation end (62) of the heat pipe (6) is attached to the LED light source board (3). The heat dissipation shell (1) of the lamp body has a first opening (12) for the LED beads (31) on the LED light source board (3) to be exposed. The first opening (12) has a reflector (7) covering the LED beads (31) and the light outlet facing the lens (2). The first opening (12) also has a light-blocking strip (8) located above the light outlet of the reflector (7).
2. The LED vehicle lamp dissipating heat by adopting the loop heat pipe according to claim 1, characterized in that: The PCB driver board (4) has a slot (41) for inserting the rear end of the LED light source board (3) into it. The PCB driver board (4) is horizontally arranged, and the LED light source board (3) is vertically arranged.
3. The LED automotive light using a ring-shaped heat pipe for heat dissipation according to claim 1, characterized in that: The heat dissipation component (5) includes a fan fixing member (51) disposed inside the rear end of the lamp body heat dissipation shell (1), the fan fixing member (51) is provided with a heat dissipation fan (52), and the top of the fan fixing member (51) is provided with ventilation openings (53) that communicate with the interior of the lamp body heat dissipation shell (1).
4. An LED automotive lamp employing an annular heat pipe for heat dissipation according to any one of claims 1 to 3, characterized in that: The lamp body heat dissipation shell (1) includes a first shell body (13) and a second shell body (14) that are left and right covered together. The length of the first shell body (13) is less than that of the second shell body (14). The first opening (12) is formed between the front end of the first shell body (13) and the front end of the second shell body (14). The front end of the second shell body (14) is provided with a lens fixing member (141) for fixing the lens (2) therein. The light blocking strip (8) is provided on the second shell body (14) and located between the reflector (7) and the lens (2).
5. An LED automotive lamp employing a ring-shaped heat pipe for heat dissipation according to claim 4, characterized in that: The second outer shell body (14) has a second opening (142), and the rear edge of the second opening (142) is flush with the light-blocking strip (8).
6. An LED automotive lamp employing a ring-shaped heat pipe for heat dissipation according to claim 1, characterized in that: The lamp body heat dissipation shell (1) is fitted with a chuck (9) fixedly connected to the headlight assembly, and a sealing ring (91) is provided between the chuck (9) and the lamp body heat dissipation shell (1).
7. An LED automotive lamp employing a ring-shaped heat pipe for heat dissipation according to claim 1, characterized in that: The lamp body heat dissipation shell (1) is an integrated or split structure made of heat dissipation aluminum or heat dissipation copper material by die casting or extrusion.
8. An LED automotive lamp employing a ring-shaped heat pipe for heat dissipation according to claim 1, characterized in that: The evaporation end (62) is welded to the back of the LED light source board (3), and / or the evaporation end (62) is welded to the side end of the LED light source board (3).