A vehicle lamp moisture-proof, air-permeable and defogging structure

Abstract

The utility model discloses a kind of car light moisture-proof, breathable defogging structures, comprising: rear cover shell, rear cover shell has the cavity for accommodating drying agent, the mounting boss of the cavity bottom has the design of rising, mounting boss center is equipped with the breathable pipeline that leads to the top of rear cover shell;Valve component buckled in the bottom of breathable pipeline;First PTFE film is shielded valve component by laser welding in mounting boss outer ring;Sealingly arranged in the top of rear cover shell protective end cap, the air passage of protective end cap inboard has the docking lead-through breathable pipeline and extends to cavity, outside is provided with multiple through breathable groove;Second PTFE film is covered in the inboard of protective end cap, and second PTFE film exposes breathable pipeline.The utility model is automatically opened and closed by valve component with pressure change, realizes the pressure balance inside and outside car light;Utilize the breathable waterproof characteristic of PTFE film and the hygroscopic effect of drying agent, effectively block external humidity and remove internal humidity, prevent car light fogging, prolong service life.

Description

Technical Field

[0001] This utility model belongs to the technical field of vehicle headlight rear cover, specifically, it relates to a vehicle headlight moisture-proof, breathable, and defogging structure. Background Technology

[0002] Typical car headlights usually consist of a base, with a light source inserted and fixed inside the base from the rear. To prevent water droplets, moisture, or dust from seeping in and affecting the lighting effect or damaging the light source, car headlights must have corresponding waterproof and dustproof functions. In addition, when the user turns on the headlights, the heat generated by the light source will cause the overall temperature of the headlight to rise with usage time. Therefore, car headlights must maintain good air convection as a heat dissipation mechanism to prevent the high heat generated during prolonged illumination from accumulating inside the headlight; otherwise, it can further shorten the lifespan of the light source and may also affect the deterioration or deformation of the plastic materials used in the headlight.

[0003] In other words, car lights must simultaneously take into account the functions of heat dissipation, waterproofing, and moisture protection. Therefore, some manufacturers have developed vent covers for car lights, such as U.S. Patent No. 6364924. The aforementioned car light base has a vent tube protruding from the rear, connecting the inside of the base to the outside. The aforementioned vent cover is composed of a hollow elastic cylinder and a U-shaped cover. The outer circumference of the elastic cylinder is provided with several protrusions. The user must first insert the aforementioned elastic cylinder into the cover. At this time, the protrusions of the elastic cylinder will support the inner wall of the cover and form an air channel. Then the user will put the vent cover on the vent tube, that is, insert the vent tube into the cylinder to complete the overall assembly.

[0004] While the aforementioned breathable cover structure can provide heat dissipation, waterproofing, and breathability, it cannot prevent moisture from entering or balance internal moisture. Furthermore, the two-piece assembly structure consumes additional assembly time and costs, and still needs further improvement. Utility Model Content

[0005] In view of this, the technical problem to be solved by this utility model is to provide a moisture-proof, breathable and defogging structure for vehicle lights, so as to avoid the problems of poor moisture absorption and breathability of previous vehicle light back covers, troublesome installation and replacement, high cost and short life of lamps.

[0006] To solve the above-mentioned technical problems, this utility model discloses a moisture-proof, breathable, and defogging structure for vehicle lights, comprising:

[0007] The rear cover housing has a cavity for holding desiccant. The bottom of the cavity has a mounting boss with an upward design. The center of the mounting boss has a vent pipe that leads to the top of the rear cover housing. The bottom inner wall of the vent pipe is provided with a snap ring platform for snapping valve components and is provided with a vent ring hole.

[0008] A valve component snapped onto the bottom of the vent pipe, the valve component is made of EPDM and is umbrella-shaped, having a rod that snaps into the snap ring platform and an umbrella part that presses against the outer ring of the mounting boss. The rod is inverted and exposes the vent ring hole. The inner ring of the umbrella part has an inward concave arc facing the vent ring hole, and the outer ring has an annular protrusion that presses against the mounting boss, and the annular protrusion is spaced from the edge of the umbrella part.

[0009] The first PTFE membrane is laser-welded to the outer ring of the mounting boss and to shield the valve component.

[0010] A protective end cap is sealed on the top of the rear cover housing. The inner side of the protective end cap has an air passage that connects to and extends into the cavity through a ventilation pipe. The outer side is provided with multiple through ventilation grooves, which are spaced apart from the air passages.

[0011] A second PTFE membrane is installed inside the protective end cap, with the second PTFE membrane exposed in the venting channel.

[0012] According to one embodiment of this utility model, when the internal and external pressures of the headlight are balanced, the valve component is in a completely sealed state. When the headlight is turned on, the internal temperature of the headlight rises, generating pressure. This pressure opens the valve component from the inside out, releasing the internal pressure of the headlight. When the headlight is turned off, the internal temperature decreases, generating negative pressure. The external pressure acts on the surface of the valve component, squeezing and deforming it. At this time, the annular protrusion on the inner side of the valve component contacts the mounting boss, causing the edge of the valve component to warp and deform, creating a gap. Air enters the headlight through the gap, achieving pressure balance. Simultaneously, the air entering the headlight flows through the air passage and reacts with the desiccant in the cavity to absorb moisture, ensuring that the air entering the headlight is relatively dry.

[0013] According to one embodiment of the present invention, the desiccant is made of silica gel particles, which have excellent moisture absorption properties and can effectively absorb moisture from the air entering the vehicle headlight.

[0014] According to one embodiment of the present invention, the rear cover housing is provided with a sealing ring, which enhances the sealing between the rear cover housing and other components of the vehicle headlight, and prevents moisture from entering through the connection gap.

[0015] According to one embodiment of the present invention, the air duct is configured as a surround type, which extends the air flow path, allows the air to fully contact the desiccant, and improves the moisture absorption effect.

[0016] According to one embodiment of the present invention, the above-mentioned ventilation groove is provided with a screen, which can filter dust and other impurities in the air and prevent impurities from entering the interior.

[0017] According to one embodiment of this utility model, the venting opening pressure of the valve component is 0.5-5.8 kPa, and the cross-sectional area of ​​the venting pipe is 0.56-9 mm².2 The cross-sectional area of ​​the airway is 0.25-2.88 mm. 2 By setting parameters, the sensitivity of pressure regulation and the efficiency of air circulation can be ensured.

[0018] Compared with the prior art, the present invention can achieve the following technical effects:

[0019] 1. The umbrella-shaped valve component made of EPDM material can automatically open or close according to pressure changes, so as to achieve dynamic balance of internal and external pressure of the headlight and effectively protect the sealing structure of the headlight.

[0020] 2. Set up a first PTFE membrane and a second PTFE membrane. Utilize the breathable and waterproof properties of PTFE material to ensure gas flow while blocking liquid water vapor from entering, thereby improving the moisture-proof effect.

[0021] 3. The desiccant (silica gel particles) inside the cavity can effectively absorb moisture from the air entering the headlight, preventing fogging, and the cavity design makes it easy to replace the desiccant.

[0022] 4. The surrounding air duct extends the airflow path, allowing the air to fully contact the desiccant and improving moisture absorption efficiency.

[0023] 5. The components are rationally designed and connected by snap-fit, laser welding, and sealing methods, resulting in a stable and reliable overall structure with a long service life.

[0024] Of course, any product implementing this utility model does not necessarily need to achieve all of the above-mentioned technical effects at the same time. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0026] Figure 1 This is a cross-sectional schematic diagram of the vehicle lamp moisture-proof, breathable, and defogging structure according to an embodiment of this utility model;

[0027] Figure 2 This is a schematic diagram of the separation of the vehicle lamp moisture-proof, breathable, and defogging structure according to an embodiment of this utility model;

[0028] Figure 3 This is a schematic diagram of the protective end cap according to an embodiment of the present utility model;

[0029] Figure 4 This is a schematic diagram of the valve component for air intake and exhaust in an embodiment of this utility model.

[0030] Attached Figure Labels

[0031] The rear cover housing 10, cavity 11, mounting boss 12, desiccant 13, vent pipe 20, snap-fit ​​boss 21, vent ring hole 22, valve component 30, rod 31, umbrella part 32, annular protrusion 33, first PTFE membrane 41, second PTFE membrane 42, protective end cap 50, air passage 51, vent groove 52, and sealing ring 60. Detailed Implementation

[0032] The following will describe in detail the implementation of this utility model with reference to the accompanying drawings and embodiments, so that the implementation of this utility model can be fully understood and carried out based on how technical means are used to solve technical problems and achieve technical effects.

[0033] Please refer to Figures 1 to 4 , Figure 1 This is a cross-sectional schematic diagram of the vehicle lamp moisture-proof, breathable, and defogging structure according to an embodiment of this utility model; Figure 2 This is a schematic diagram of the separation of the vehicle lamp moisture-proof, breathable, and defogging structure according to an embodiment of this utility model; Figure 3 This is a schematic diagram of the protective end cap according to an embodiment of the present utility model.

[0034] As shown in the figure, a vehicle headlight moisture-proof, breathable, and defogging structure includes: a rear cover housing 10, a valve component 30, a first PTFE membrane 41, a second PTFE membrane 42, and a protective end cap 50.

[0035] The rear cover housing 10 is injection molded from ABS engineering plastic and has an overall cylindrical structure. Its interior forms a cavity 11 for accommodating the desiccant 13. The size of the cavity 11 is adapted to the installation specifications of the rear seat of the automotive lighting system. The bottom of the cavity 11 has an integrally formed mounting boss 12 with a rising design, meaning it appears sunken relative to the outside. The center of the mounting boss 12 has a vent pipe 20 that leads to the top of the rear cover housing 10. The length of the vent pipe 20 can be set to approximately 20mm as needed. Its bottom inner wall has a ring of inwardly protruding snap-fit ​​bosses 21. The snap-fit ​​bosses 21 have multiple evenly distributed 1.5mm diameter vent ring holes 22 or vent ring holes 22 in a circular design to ensure internal and external communication, while simultaneously using a valve component 30 for sealing.

[0036] The valve component 30 is molded from EPDM (ethylene propylene diene monomer rubber) and has an overall umbrella-shaped structure, capable of elastic bending deformation and memory rebound. The valve component 30 has a rod 31 that snaps into the snap-fit ​​boss 21 and an umbrella-shaped portion 32 that presses against the outer ring of the mounting boss 12. The rod 31 is inverted, with a barbed structure at its end to facilitate a secure snap-fit ​​with the snap-fit ​​boss 21. The rod 31 has a small diameter, ensuring that the vent hole 22 is exposed for easy air release. The inner ring of the umbrella-shaped portion 32 has a concave arc facing the vent hole 22, and the outer ring is integrally formed with an annular protrusion 33 that presses against the mounting boss 12. The annular protrusion 33 is located on the outer ring of the vent hole 22, and a gap is left between the annular protrusion 33 and the edge of the umbrella-shaped portion 32. In this embodiment, the vent opening pressure of the valve component 30 is set to 2.5 kPa.

[0037] The first PTFE membrane 41 is fixed to the outer ring of the mounting boss 12 by laser welding, providing waterproof and breathable functions, while ensuring that the first PTFE membrane 41 completely covers the valve component 30 and does not affect the flow of air through the gaps at the edge of the valve component 30.

[0038] The protective end cap 50 is injection molded from PC material and sealed to the top of the rear cover housing 10 by ultrasonic welding. The inner side of the protective end cap 50 has an integrally formed air passage 51 that connects to and vents the ventilation pipe 20, extending into the cavity 11. The air passage 51 has a wraparound structure with a rectangular cross-section and a cross-sectional area of ​​0.25-2.88 mm². 2 ,like Figure 3 As shown, the airflow path is relatively extended, allowing the air to fully contact the desiccant and improving the moisture absorption efficiency.

[0039] The protective end cap 50 has multiple through-hole ventilation grooves 52 evenly arranged on its outer side, and the ventilation grooves 52 are separated from the air passages 51. Each ventilation groove 52 is embedded with a screen, which can filter dust and other impurities in the air and prevent impurities from entering the interior.

[0040] The second PTFE membrane 42 is sized to match the inner side of the protective end cap 50 and is applied to the inner side of the protective end cap 50 by laser welding or adhesive bonding, precisely exposing the mating port of the vent pipe 20. In other embodiments, it can also be fixed to one side of the rear cover housing 10, but this utility model is not limited thereto.

[0041] In this embodiment, the desiccant 13 is set as silica gel particles with a diameter of 2-3 mm, and its filling amount is 2 / 3 of the volume of the cavity 11. The silica gel particles are activated and can absorb more than 30% of their own weight in moisture.

[0042] In addition, a sealing ring 60 is provided around the outer periphery of the rear cover housing 10. The sealing ring 60 is made of nitrile rubber, has a circular cross-section, and a diameter of 2mm, which is used to enhance the sealing performance between the rear cover housing 10 and the headlight housing.

[0043] In this embodiment, the cross-sectional area of ​​the ventilated pipe 20 is designed to be 0.56-9mm². 2 The cross-sectional area of ​​airway 51 is 0.25-2.88 mm. 2 A proper ratio is formed to ensure smooth airflow and full contact with the desiccant.

[0044] Please refer to Figure 4 ,in Figure 4 Figure (a) is a schematic diagram of the valve component venting according to an embodiment of this utility model. Figure 4 Figure (b) is a schematic diagram of the air intake of the valve component according to an embodiment of the present invention. The working process of this embodiment is as follows:

[0045] When the internal and external pressures of the headlight are balanced, the umbrella part 32 of the valve component 30, under its own elasticity, presses tightly against the mounting boss 12 through the annular protrusion 33, forming a completely sealed state and effectively preventing external moisture from entering.

[0046] When the headlights are turned on, the internal temperature of the headlights gradually increases, and the air expands to generate positive pressure. When the pressure reaches 2.5 kPa, the pressure pushes the umbrella part 32 of the valve component 30 open from the inside to the outside. The air inside the headlights is discharged to the outside through the vent ring hole 22, the vent pipe 20, the air passage 51 and the vent groove 52 in sequence, quickly releasing the internal pressure and preventing damage to the sealing structure of the headlights.

[0047] When the headlights are turned off, the internal temperature gradually decreases (to within ±5°C of ambient temperature). The air contracts, creating negative pressure. External pressure acts on the surface of the valve component 30 (transmitted through the first PTFE membrane 41), squeezing and deforming the umbrella part 32 of the valve component 30. At this time, the annular protrusion 33 contacts the mounting boss 12 to form a fulcrum, causing the edge of the umbrella part 32 to lift up and create a gap. External air enters through the gap and passes through the first PTFE membrane 41, the venting ring hole 22, the venting pipe 20, and the air passage 51 in sequence, making full contact with the silicone particles in the cavity 11. The silicone particles absorb the moisture in the air, and the dried air enters the headlight, ultimately achieving pressure balance.

[0048] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A moisture-proof, breathable, and defogging structure for vehicle lights, characterized in that, include: The rear cover housing has a cavity for accommodating a desiccant. The bottom of the cavity has a rising mounting boss. The center of the mounting boss is provided with a vent pipe that leads to the top of the rear cover housing. The bottom inner wall of the vent pipe is provided with a snap ring platform, and the snap ring platform is provided with a vent ring hole. A valve component snapped onto the bottom of the vent pipe, the valve component being made of EPDM and umbrella-shaped, having a rod portion snapping into the snap ring platform and an umbrella portion pressing against the outer ring of the mounting boss, the rod portion being inverted and exposing the vent ring hole, the inner ring of the umbrella portion having an inward concave arc facing the vent ring hole, and the outer ring having an annular protrusion pressing against the mounting boss, and the annular protrusion being spaced from the edge of the umbrella portion; A first PTFE membrane is laser-welded to the outer ring of the mounting boss and used to shield the valve component; A protective end cap is sealed on the top of the rear cover housing. The inner side of the protective end cap has an air passage that connects to and guides the vent pipe and extends into the cavity. The outer side is provided with multiple through vent grooves, and the vent grooves are spaced apart from the air passages. A second PTFE membrane is applied to the inside of the protective end cap, and the second PTFE membrane is exposed in the venting channel.

2. The vehicle headlight moisture-proof, breathable, and defogging structure according to claim 1, characterized in that, When the internal and external pressures of the headlight are balanced, the valve is completely sealed. When the headlight is on, the internal temperature rises, generating pressure that opens the valve from the inside out, releasing the internal pressure. When the headlight is off, the internal temperature drops, creating negative pressure. External pressure acts on the surface of the valve, deforming it. At this point, the annular protrusion on the inner side of the valve contacts the mounting boss, causing the edge of the valve to warp and create a gap. Air enters the headlight through this gap, achieving pressure balance. Simultaneously, the air entering the headlight flows through the air passage and reacts with the desiccant in the cavity to absorb moisture, ensuring that the air entering the headlight is relatively dry.

3. The vehicle headlight moisture-proof, breathable, and defogging structure according to claim 1, characterized in that, The desiccant is described as silica gel particles.

4. The vehicle headlight moisture-proof, breathable, and defogging structure according to claim 1, characterized in that, The rear cover housing is provided with a sealing ring.

5. The vehicle headlight moisture-proof, breathable, and defogging structure according to claim 1, characterized in that, The airway is configured as a surround type.

6. The vehicle headlight moisture-proof, breathable, and defogging structure according to claim 1, characterized in that, The ventilation groove is equipped with a screen.

7. The vehicle headlight moisture-proof, breathable, and defogging structure according to claim 1, characterized in that, The valve component has a venting opening pressure of 0.5-5.8 kPa, and the venting pipe has a cross-sectional area of ​​0.56-9 mm². 2 The cross-sectional area of ​​the airway is 0.25-2.88 mm. 2 .

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