A heat-dissipating lampshade for a motor train headlamp

Abstract

The utility model belongs to the technical field of high -speed train lighting accessories, especially is a high -speed train headlamp heat dissipation lamp shade, including lamp shade body, heat conduction subassembly and engagement mechanism, lamp shade body is formed by coaxial assembly of outer cover body and inner cover body, heat conduction subassembly sets up in the side of inner cover body towards light source, is used for the heat of light source generation conduction to heat dissipation cavity, the outside wall and inner side wall of outer cover body all are equipped with epitaxial type heat dissipation structure, the inner cover body is seted up and is equipped with the through type air hole, through the composite heat dissipation path of heat conduction subassembly conduction, heat dissipation cavity buffer, epitaxial type heat dissipation structure radiation, realize the quick export and the emission of heat, effectively control the working temperature of LED light source, avoid the light decay and the shortened life, adapt the use demand of high -power LED light source, adopt the design of airtight heat dissipation cavity, cooperate the sealing buffer structure of connecting part and the waterproof air -permeable membrane of corresponding air hole setting, effectively block dust, water vapor, rainwater and so on and so on erosion, prolong the service life of headlamp internal element.

Description

Technical Field

[0001] This utility model belongs to the technical field of high-speed train lighting accessories, specifically relating to a heat dissipation lamp cover for a high-speed train headlight. Background Technology

[0002] Train headlights are core equipment that ensures safe operation of trains at night, in tunnels, and in adverse weather conditions. Their lighting stability is directly related to train safety. With the iterative upgrade of LED technology, high-power LED light sources have gradually replaced traditional light sources and become the mainstream choice for train headlights due to their significant advantages such as high brightness, low power consumption, and long lifespan.

[0003] However, high-power LED light sources generate a lot of heat during operation, and their luminous efficiency and lifespan are extremely sensitive to temperature: when the temperature exceeds the rated operating temperature, LED light sources are prone to problems such as accelerated light decay, color temperature drift, and decreased color rendering. In severe cases, it can even lead to chip burnout, directly affecting the reliability of the headlights.

[0004] In the existing technology, the heat dissipation methods of high-speed train headlights have a number of limitations. For example, some technologies dissipate heat by setting a gap between the reflector bowl and the glass cover, but this method has limited heat dissipation efficiency and is prone to dust and moisture entering. Other technologies use cooling fans for forced air cooling, but the fans are noisy, consume a lot of energy, and are prone to failure due to dust accumulation during long-term operation.

[0005] To solve the above problems, this utility model proposes a heat dissipation lamp cover for high-speed train headlights. Utility Model Content

[0006] To address the aforementioned problems in the existing technology, this utility model provides a heat dissipation lamp cover for high-speed train headlights, which is convenient to use, facilitates heat dissipation, and provides good protection.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a heat dissipation lamp cover for a high-speed train headlight, comprising a lamp cover body, a heat conduction component, and a locking mechanism;

[0008] The lampshade body is formed by coaxially assembling an outer cover and an inner cover, which together form a sealed heat dissipation cavity. The outer side wall of the outer cover is provided with multiple mounting feet that are fixed together.

[0009] The heat-conducting component is disposed on the side of the inner cover facing the light source, and is used to conduct the heat generated by the light source to the heat dissipation cavity;

[0010] Both the outer and inner walls of the outer casing are provided with extended heat dissipation structures;

[0011] The locking mechanism is used to detachably fix the outer cover and the inner cover, and a sealing and buffering structure is provided between the outer cover and the inner cover;

[0012] The inner cover has through-type ventilation holes.

[0013] As a preferred technical solution of this utility model, the extended heat dissipation structure is a heat dissipation protrusion evenly distributed along the axial direction of the outer side wall and the inner side wall of the outer cover. The heat dissipation protrusion and the outer cover are integrally injection molded, and the heat dissipation protrusion is one of the fin type, column type or grid type structure.

[0014] As a preferred embodiment of this utility model, the heat-conducting component includes a heat-conducting boss fixedly connected to the inner wall of the inner cover, and the end face of the heat-conducting boss facing the light source is provided with a heat-conducting medium.

[0015] As a preferred embodiment of this utility model, the heat-conducting boss is an aluminum alloy component and is bonded and fixed to the inner wall of the inner cover using thermally conductive adhesive.

[0016] As a preferred embodiment of this invention, the thermally conductive medium is one of thermal grease, thermally conductive gel, or nano-thermal conductive coating.

[0017] As a preferred embodiment of this utility model, the locking mechanism includes a first positioning ring disposed at the port position of the outer cover and a second positioning ring disposed at the port position of the inner cover.

[0018] The first positioning ring has a through hole, and the second positioning ring has an elastic sheet that mates with the through hole. A wedge block is fixed to the free end of the elastic sheet, and the wedge block forms a limiting fit with the edge of the through hole.

[0019] As a preferred embodiment of this utility model, the sealing and buffering structure is a flexible support strip fixed to the inner side wall of the outer cover, and the flexible support strip is a rubber strip.

[0020] As a preferred embodiment of this utility model, a waterproof and breathable membrane is attached to the inner wall of the inner cover at the position corresponding to the vent holes.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] 1. Through a composite heat dissipation path of heat conduction by heat-conducting components, buffering by heat dissipation cavity, and radiation by extended heat dissipation structure, heat is quickly discharged and dissipated, effectively controlling the operating temperature of LED light source, avoiding light decay and shortened lifespan, and adapting to the usage requirements of high-power LED light source;

[0023] 2. The design adopts a closed heat dissipation chamber, combined with a sealed buffer structure at the connection points and a waterproof and breathable membrane with corresponding vents, which effectively blocks the erosion of dust, water vapor, rainwater, etc., and extends the service life of the internal components of the headlight.

[0024] 3. No additional cooling fan is required; cooling is achieved through natural heat dissipation, avoiding noise and energy consumption generated by fan operation, which meets the energy-saving and noise reduction requirements of high-speed trains.

[0025] 4. The outer and inner covers can be quickly disassembled and assembled through a snap-fit ​​mechanism, without the need for complicated tools, which facilitates later inspection and maintenance.

[0026] Other additional advantages and beneficial effects of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this invention. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0028] Figure 1 This is a schematic diagram of the structure of this utility model;

[0029] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0030] Figure 3 This is an isometric structural diagram of the outer casing in this utility model;

[0031] Figure 4 This is an isometric structural diagram of the inner cover body in this utility model;

[0032] Figure 5 This utility model Figure 2 A magnified schematic diagram of the locking mechanism.

[0033] In the diagram: 1. Lampshade body; 11. Outer cover; 111. Mounting foot; 112. Flexible support strip; 113. Heat dissipation protrusion; 12. Inner cover; 121. Vent hole; 122. Waterproof and breathable membrane; 13. Heat dissipation cavity; 2. Heat-conducting component; 21. Heat-conducting boss; 22. Heat-conducting medium; 3. Locking mechanism; 31. First positioning ring; 311. Through hole; 32. Second positioning ring; 33. Elastic sheet; 331. Wedge block. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] Please see Figures 1-5 The present invention provides the following technical solution: a heat dissipation lamp cover for a high-speed train headlight, comprising a lamp cover body 1, a heat conduction component 2, and a locking mechanism 3.

[0036] Furthermore, by Figures 1-3 As shown, in this embodiment, the lampshade body 1 is formed by coaxially assembling an outer cover 11 and an inner cover 12, which together form a sealed heat dissipation cavity 13. The outer wall of the outer cover 11 has multiple integrally mounted feet 111. A heat-conducting component 2 is located on the side of the inner cover 12 facing the light source, used to conduct the heat generated by the light source to the heat dissipation cavity 13. Both the outer and inner walls of the outer cover 11 have extended heat dissipation structures. A locking mechanism 3 is used to detachably fix the outer cover 11 and the inner cover 12, and a sealing buffer structure is provided between the outer cover 11 and the inner cover 12. A through-hole vent 121 is provided on the inner cover 12. With the above solution, during use, the outer cover... The mounting feet 111 on the outer wall of the cover 11 can be bolted to stably assemble the entire heat dissipation lamp cover onto the lamp body base of the train headlight, ensuring that the relative position of the lamp cover body 1 and the light source assembly is fixed, providing a stable structural foundation for subsequent heat conduction and heat dissipation; at the same time, the outer cover 11 and the inner cover 12 are coaxially locked by the locking mechanism 3, and the sealing buffer structure between the two is compressed and fitted, which not only achieves the airtight seal of the closed heat dissipation cavity 13, preventing external dust, rain, and fog from entering the heat dissipation cavity 13 and the light source area, but also absorbs the rigid impact between the outer cover 11 and the inner cover 12 in the vibration environment generated by the train operation, avoiding structural wear or breakage.

[0037] When the headlights of the train are turned on, the light source (such as LED beads) generates a lot of heat. Since the heat conduction component 2 is fixed to the side of the inner cover 12 facing the light source, and one end of it is directly attached to the heat dissipation substrate of the light source, it can quickly capture the heat generated by the light source and transfer the heat to the wall of the inner cover 12 through the thermal conduction effect.

[0038] After receiving the heat transferred by the heat-conducting component 2, the inner cover 12 conducts the heat evenly to the closed heat dissipation cavity 13 formed by the outer cover 11 and the inner cover 12 through the heat diffusion effect of its own wall. This causes the air in the heat dissipation cavity 13 to be heated and form micro-convection, which further promotes the uniform distribution of heat in the heat dissipation cavity 13 and avoids local heat accumulation.

[0039] Both the inner and outer walls of the outer casing 11 are provided with extended heat dissipation structures (such as heat dissipation fins). The extended heat dissipation structure of the inner wall is in direct contact with the heated air in the heat dissipation cavity 13. By increasing the heat exchange area, it can quickly absorb the heat in the heat dissipation cavity 13 and transfer it to the outer casing 11 body.

[0040] The extended heat dissipation structure on the outer wall is exposed to the external airflow environment of the train. When the train is running, the external cold air and the extended heat dissipation structure on the outer wall form forced convection heat exchange. At the same time, the extended heat dissipation structure dissipates heat to the atmosphere through radiation heat exchange, realizing efficient heat transfer from the inside of the lampshade to the outside.

[0041] The through-hole vent 121 on the inner cover 12 can balance the air pressure inside and outside the heat dissipation cavity 13: when the lamp cover is working, the air inside the heat dissipation cavity 13 is heated and expands, and the excess air pressure is slowly released through the vent 121, avoiding excessive air pressure inside the heat dissipation cavity 13, which may cause deformation or failure of the sealing buffer structure; when the lamp cover stops working, the air inside the heat dissipation cavity 13 cools and contracts, and outside air enters through the vent 121, preventing the formation of negative pressure inside the cavity, which may cause the outer cover 11 or the inner cover 12 to dent.

[0042] In addition, a waterproof and breathable membrane 122 (such as a PTFE breathable membrane) can be installed in the vent 121 to prevent dust and rainwater from entering the heat dissipation cavity 13 while ensuring air pressure balance, so as to avoid affecting the working performance of the heat conduction component 2 or the light source.

[0043] When it is necessary to clean or replace the heat-conducting component 2, or to maintain the internal or external heat dissipation structure of the heat dissipation cavity 13, the outer cover 11 and the inner cover 12 can be separated by disassembling the locking mechanism 3, without having to remove the entire lamp cover, thus reducing maintenance difficulty and cost. At the same time, the sealing buffer structure can be reused during disassembly and assembly, ensuring that the sealing performance of the heat dissipation cavity 13 is not affected.

[0044] Optionally, by Figures 1-3As shown in this embodiment, the extended heat dissipation structure consists of heat dissipation protrusions 113 evenly distributed along the outer and inner sidewalls of the outer cover 11. The heat dissipation protrusions 113 and the outer cover 11 are integrally injection molded, and the heat dissipation protrusions 113 are one of the fin type, protruding column type, or grid type structures. With the above solution, the heat dissipation protrusions 113 and the outer cover 11 are integrally injection molded, which not only eliminates the subsequent assembly process, significantly simplifies the production process and reduces manufacturing costs, but also eliminates the contact thermal resistance caused by the splicing structure, so that the outer cover 11 body and the heat dissipation protrusions 113 form a continuous and complete heat conduction path, with no heat transfer loss and greatly improving heat conduction efficiency; at the same time, the integral structure has higher structural strength and can withstand complex working conditions such as high-frequency vibration and airflow impact during train operation, avoiding failure problems such as detachment and breakage of the heat dissipation protrusions 113, and ensuring the long-term stability of the extended heat dissipation structure.

[0045] It is worth noting that the thickness of the heat dissipation protrusion 113 is less than the thickness of the heat dissipation cavity 13, so as to avoid the heat dissipation protrusion 113 obstructing the airflow inside the heat dissipation cavity 13.

[0046] The heat dissipation protrusions 113 are evenly distributed along the inner and outer side walls of the outer casing 11, which can make heat spread evenly on the inner and outer wall surfaces, avoid local heat accumulation and the formation of hot spots, ensure uniform air convection in the heat dissipation cavity 13, and sufficient heat exchange between the outer side of the outer casing 11 and the external airflow, further improving the uniformity and stability of overall heat dissipation, and effectively preventing the light source from accelerating light decay or core component damage due to local high temperature.

[0047] The heat dissipation protrusion 113 offers three optional structures: finned, columnar, and grille, which can be flexibly adapted to the actual scenario such as the installation space of the train headlight, airflow path, and heat dissipation requirements.

[0048] Optionally, by Figure 1 , Figure 2 and Figure 4 As shown, in this embodiment, the heat-conducting component 2 includes a heat-conducting boss 21 fixedly connected to the inner wall of the inner cover 12. The end face of the heat-conducting boss 21 facing the light source is provided with a heat-conducting medium 22. With the above solution, when in use, the heat-conducting boss 21 is fixedly connected to the inner wall of the inner cover 12 to form a continuous and complete heat-conducting path, eliminating the contact thermal resistance that may be generated by the split assembly, so that the heat received by the inner cover 12 can be quickly and without loss to the heat-conducting boss 21.

[0049] The heat-conducting medium 22 disposed on the end face of the heat-conducting protrusion 21 facing the light source can accurately fill the tiny gap between the heat-conducting protrusion 21 and the heat dissipation substrate (or the housing of the light source), eliminate the air thermal resistance in the gap, and make the two form a tight thermal contact state, which greatly improves the heat transfer efficiency from the light source to the heat-conducting protrusion 21, avoids the accumulation of heat on the surface of the light source to form local high temperature, and effectively slows down the light decay rate and aging process of the light source.

[0050] Optionally, by Figure 1 , Figure 2 and Figure 4 As shown in this embodiment, the heat-conducting boss 21 is an aluminum alloy component and is bonded and fixed to the inner wall of the inner cover 12 using thermally conductive adhesive. With the above solution, the use of aluminum alloy components for the heat-conducting boss 21 during use can, on the one hand, utilize the high thermal conductivity of aluminum alloy to quickly receive and transfer the heat conducted by the light source through the thermally conductive medium 22, avoiding heat accumulation on the heat-conducting boss 21 body and ensuring efficient and smooth heat conduction to the subsequent inner cover 12; on the other hand, aluminum alloy has excellent high-temperature stability, and is not prone to deformation, softening or thermal conductivity degradation in the high-temperature environment of the train headlight during long-term operation, and can maintain stable thermal conductivity for a long time, adapting to the high-frequency and long-term heat dissipation needs of the light source and ensuring the service life of the core components of the headlight.

[0051] The aluminum alloy thermally conductive protrusion 21 is fixed to the inner wall of the inner cover 12 using thermally conductive adhesive. The thermally conductive adhesive itself has good thermal conductivity. While achieving the fixing function, it can fill the tiny gaps between the thermally conductive protrusion 21 and the inner wall of the inner cover 12 caused by processing precision and surface roughness, eliminate the air thermal resistance in the gaps, and further improve the overall thermal conductivity.

[0052] After the thermally conductive adhesive cures, it forms a high-strength adhesive structure that can tightly fit the thermally conductive protrusion 21 and the inner cover 12. During the operation of the train, it can withstand complex working conditions such as high-frequency vibration and bumps, preventing relative displacement or loosening between the thermally conductive protrusion 21 and the inner cover 12, and ensuring the long-term structural stability and reliable thermal conductivity of the thermally conductive component 2.

[0053] Optionally, by Figure 1 , Figure 2 and Figure 4 As shown in this embodiment, the thermally conductive medium 22 is one of thermal grease, thermally conductive gel, or nano-thermal conductive coating. When using the above solution, the thermal grease has a high thermal conductivity and excellent gap filling properties, which can accurately fill the tiny gaps between the thermally conductive protrusion 21 and the heat dissipation substrate (or the housing of the light source), eliminate the air thermal resistance in the gaps, and make the two form a tight thermal contact interface, which greatly improves the heat transfer efficiency from the light source to the thermally conductive protrusion 21 and avoids the local high temperature generated on the surface of the light source due to heat accumulation.

[0054] The thermally conductive gel combines high elasticity and high thermal conductivity. On the one hand, it can fill the contact gaps like thermal grease, eliminate air thermal resistance, and ensure efficient heat conduction. On the other hand, its gel-like elastic structure can compensate for the slight relative displacement between the light source and the thermally conductive protrusion 21 caused by vibration and bumps during the operation of the train, and always maintain close thermal contact between the two, avoiding problems such as poor contact and interruption of heat conduction caused by vibration, thus adapting to the complex vibration conditions of the train.

[0055] The nano-thermal conductive coating can form a uniform, ultra-thin thermal conductive film layer (usually a few micrometers to tens of micrometers thick) on the surface of the thermal conductive protrusion 21 by spraying, brushing or other methods. It will not occupy the limited space inside the headlight and can adapt to the needs of compact structural design.

[0056] Optionally, by Figure 1 , Figure 2 and Figure 5 As shown, in this embodiment, the locking mechanism 3 includes a first positioning ring 31 located at the port of the outer cover 11 and a second positioning ring 32 located at the port of the inner cover 12. The first positioning ring 31 has a through hole 311, and the second positioning ring 32 has an elastic piece 33 that cooperates with the through hole 311. The free end of the elastic piece 33 is fixed with a wedge block 331. The wedge block 331 and the edge of the through hole 311 form a limiting fit. With the above solution, during use, when the outer cover 11 and the inner cover 12 are coaxially assembled, the second positioning ring 32 of the inner cover 12 is aligned with the first positioning ring 31 of the outer cover 11 and pushed in. At this time, the wedge-shaped inclined surface of the wedge block 331 at the free end of the elastic piece 33 on the second positioning ring 32 will first contact the end face of the first positioning ring 31.

[0057] As the inner cover 12 is continuously pushed in, the wedge-shaped inclined surface is subjected to the squeezing force of the end face of the first positioning ring 31, causing the elastic sheet 33 to undergo elastic deformation and contract towards the second positioning ring 32. When the inner cover 12 and the outer cover 11 are pushed to the preset coaxial position, the wedge block 331 will move to the corresponding position of the through hole 311 on the first positioning ring 31. At this time, the squeezing force of the elastic sheet 33 disappears and quickly returns to the initial state, causing the wedge block 331 to be inserted into the through hole 311. The non-wedge-shaped end face of the wedge block 331 forms an axial limiting fit with the edge of the through hole 311, thereby realizing the rapid locking and fixing of the outer cover 11 and the inner cover 12, and simultaneously putting the sealing buffer structure between the two into a compressed and sealed state, ensuring the airtightness of the sealed heat dissipation cavity 13.

[0058] When maintenance of the internal components of the heat dissipation lamp cover is required, external force is applied to the side of the second positioning ring 32 to cause the inner cover 12 to contract and deform, causing the wedge block 331 to disengage from the through hole 311, thus releasing the limiting fit between the wedge block 331 and the edge of the through hole 311. At this time, the outer cover 11 and the inner cover 12 are pulled in the opposite direction along the axial direction to achieve quick separation of the two. The entire disassembly process does not require additional tools and is convenient and efficient.

[0059] Preferably, by Figures 1-3 As shown in this embodiment, the sealing and buffering structure is a flexible support strip 112 fixed to the inner wall of the outer cover 11. The flexible support strip 112 is a rubber strip. With the above solution, when in use, the flexible support strip 112 is made of rubber material (such as nitrile rubber), which has good elastic deformation ability. When the outer cover 11 and the inner cover 12 are locked by the locking mechanism 3, the rubber flexible support strip 112 will be squeezed and tightly attached to the contact surface between the outer cover 11 and the inner cover 12, forming a continuous and gapless sealing interface. This can effectively isolate external dust, rainwater, fog and other impurities from entering the sealed heat dissipation cavity 13 and the light source area, prevent the light source components from getting damp and short-circuiting or rusting, and ensure the long-term stable operation of the heat dissipation lamp cover and the headlight.

[0060] The flexible support strip 112 made of rubber has excellent elastic buffering performance. Under the conditions of high-frequency vibration, bumps and impacts generated during the operation of the train, it can absorb the rigid impact force between the outer cover 11 and the inner cover 12 through its own elastic deformation, so as to avoid collision wear or structural cracking due to rigid contact between the two.

[0061] Preferably, by Figure 1 and Figure 2 As shown in this embodiment, a waterproof and breathable membrane 122 is attached to the inner wall of the inner cover 12 at the position corresponding to the vent 121. After adopting the above solution, when in use, the waterproof and breathable membrane 122 attached to the inner wall of the inner cover 12 has the core characteristics of "breathable but not liquid-permeable and dust-permeable". Under the premise of ensuring the air pressure balance function of the vent 121, it can effectively block external rainwater, fog, dust and other impurities from entering the heat dissipation cavity 13 and the light source area through the vent 121. It avoids the air convection channel in the heat dissipation cavity 13 from being blocked by dust accumulation, thus affecting the heat dissipation efficiency. At the same time, it prevents the core components such as the light source and heat conduction component 2 from getting damp and short-circuiting or aging due to dust accumulation, significantly improving the environmental adaptability and service life of the heat dissipation lamp cover and headlight.

[0062] Components not described in detail in this article are existing technologies.

[0063] The working principle and usage process of this utility model: When in use, the mounting feet 111 on the outer side wall of the outer cover 11 can be bolted to stably assemble the entire heat dissipation lamp cover onto the lamp body base of the train headlight, ensuring that the relative position of the lamp cover body 1 and the light source assembly is fixed, providing a stable structural foundation for subsequent heat conduction and heat dissipation; at the same time, the outer cover 11 and the inner cover 12 are coaxially locked by the locking mechanism 3, and the sealing buffer structure between the two is compressed and fitted, which not only achieves the airtight sealing of the closed heat dissipation cavity 13, preventing external dust, rain, and fog from entering the heat dissipation cavity 13 and the light source area, but also absorbs the rigid impact between the outer cover 11 and the inner cover 12 in the vibration environment generated by the train operation, avoiding structural wear or breakage;

[0064] When the headlights of the train are turned on, the light source (such as LED beads) generates a lot of heat. Since the heat conduction component 2 is fixed to the side of the inner cover 12 facing the light source, and one end of it is directly attached to the heat dissipation substrate of the light source, it can quickly capture the heat generated by the light source and transfer the heat to the wall of the inner cover 12 through the thermal conduction effect.

[0065] After receiving the heat transferred by the heat-conducting component 2, the inner cover 12 conducts the heat evenly to the closed heat dissipation cavity 13 formed by the outer cover 11 and the inner cover 12 through the heat diffusion effect of its own wall. This causes the air in the heat dissipation cavity 13 to be heated and form micro-convection, which further promotes the uniform distribution of heat in the heat dissipation cavity 13 and avoids local heat accumulation.

[0066] Both the inner and outer walls of the outer casing 11 are provided with extended heat dissipation structures (such as heat dissipation fins). The extended heat dissipation structure of the inner wall is in direct contact with the heated air in the heat dissipation cavity 13. By increasing the heat exchange area, it can quickly absorb the heat in the heat dissipation cavity 13 and transfer it to the outer casing 11 body.

[0067] The extended heat dissipation structure on the outer wall is exposed to the external airflow environment of the train. When the train is running, the external cold air and the extended heat dissipation structure on the outer wall form forced convection heat exchange. At the same time, the extended heat dissipation structure dissipates heat to the atmosphere through radiation heat exchange, realizing efficient heat transfer from the inside of the lampshade to the outside.

[0068] The through-hole vent 121 on the inner cover 12 can balance the air pressure inside and outside the heat dissipation cavity 13: when the lamp cover is working, the air inside the heat dissipation cavity 13 is heated and expands, and the excess air pressure is slowly released through the vent 121, avoiding excessive air pressure inside the heat dissipation cavity 13, which may cause deformation or failure of the sealing buffer structure; when the lamp cover stops working, the air inside the heat dissipation cavity 13 cools and contracts, and outside air enters through the vent 121, preventing the formation of negative pressure inside the cavity, which may cause the outer cover 11 or the inner cover 12 to dent.

[0069] In addition, a waterproof and breathable membrane 122 (such as a PTFE breathable membrane) can be provided in the vent 121 to prevent dust and rainwater from entering the heat dissipation cavity 13 while ensuring air pressure balance, so as to avoid affecting the working performance of the heat conduction component 2 or the light source.

[0070] When it is necessary to clean or replace the heat-conducting component 2, or to maintain the internal or external heat dissipation structure of the heat dissipation cavity 13, the outer cover 11 and the inner cover 12 can be separated by disassembling the locking mechanism 3, without having to remove the entire lamp cover, thus reducing maintenance difficulty and cost. At the same time, the sealing buffer structure can be reused during disassembly and assembly, ensuring that the sealing performance of the heat dissipation cavity 13 is not affected.

[0071] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A heat dissipation lamp cover for a high-speed train headlight, characterized in that: It includes a lampshade body (1), a heat-conducting component (2), and a locking mechanism (3); The lampshade body (1) is formed by coaxial assembly of an outer cover (11) and an inner cover (12), which together form a sealed heat dissipation cavity (13). The outer side wall of the outer cover (11) is provided with multiple mounting feet (111) that are fixed together. The heat-conducting component (2) is disposed on the side of the inner cover (12) facing the light source, and is used to conduct the heat generated by the light source to the heat dissipation cavity (13); The outer and inner walls of the outer cover (11) are provided with extended heat dissipation structures; The locking mechanism (3) is used to realize the detachable fixing of the outer cover (11) and the inner cover (12), and a sealing buffer structure is provided between the outer cover (11) and the inner cover (12); The inner cover (12) has a through-hole (121).

2. The heat dissipation lamp cover for a high-speed train headlight according to claim 1, characterized in that: The extended heat dissipation structure is a heat dissipation protrusion (113) evenly distributed along the outer side wall and inner side wall of the outer cover (11). The heat dissipation protrusion (113) and the outer cover (11) are integrally injection molded, and the heat dissipation protrusion (113) is one of the fin type, convex column type or grid type structure.

3. A heat dissipation lamp cover for a high-speed train headlight according to claim 1, characterized in that: The heat-conducting component (2) includes a heat-conducting boss (21) fixedly connected to the inner wall of the inner cover (12), and the end face of the heat-conducting boss (21) facing the light source is provided with a heat-conducting medium (22).

4. A heat dissipation lamp cover for a high-speed train headlight according to claim 3, characterized in that: The heat-conducting boss (21) is an aluminum alloy component and is bonded and fixed to the inner wall of the inner cover (12) using thermally conductive adhesive.

5. A heat dissipation lamp cover for a high-speed train headlight according to claim 3, characterized in that: The thermally conductive medium (22) is one of thermal grease, thermally conductive gel or nano-thermal conductive coating.

6. A heat dissipation lamp cover for a high-speed train headlight according to claim 1, characterized in that: The locking mechanism (3) includes a first positioning ring (31) disposed at the port position of the outer cover (11) and a second positioning ring (32) disposed at the port position of the inner cover (12); The first positioning ring (31) is provided with a through hole (311), and the second positioning ring (32) is fixed with an elastic piece (33) that cooperates with the through hole (311). A wedge block (331) is fixed at the free end of the elastic piece (33), and the wedge block (331) and the edge of the through hole (311) form a limiting fit.

7. A heat dissipation lamp cover for a high-speed train headlight according to claim 1, characterized in that: The sealing and buffering structure is a flexible support strip (112) fixed to the inner wall of the outer cover (11), and the flexible support strip (112) is a rubber strip.

8. A heat dissipation lamp cover for a high-speed train headlight according to claim 1, characterized in that: A waterproof and breathable membrane (122) is attached to the inner wall of the inner cover (12) at the position corresponding to the vent (121).

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