A replaceable structure for a vehicle lamp

Abstract

The utility model discloses a replaceable structure is kept dry to car lamp, including rear casing, EPDM keep dry valve, PTFE air permeable membrane, bag type drying agent and air permeable end cover, rear casing has main cavity, and the bottom center of main cavity is equipped with the sunken subsidiary cavity, and the center of subsidiary cavity is equipped with the upper convex mounting boss, and the center of mounting boss is equipped with the installation clamping hole, and the inner wall of installation clamping hole is equipped with air permeable ring convex, and air permeable ring convex sets up even multiple air holes along the radial direction, and the outer ring of rear casing is equipped with the sealing ring, and is installed in car lamp body through bolt fastening or thread connection mode, realizes the sealed cooperation with car lamp. The utility model discloses through EPDM keep dry valve automatic opening and closing along with pressure change, realizes the pressure balance in and outside car lamp, utilizes the air permeable waterproof characteristic of PTFE membrane and the moisture absorption of drying agent, effectively blocks the external moisture and removes internal moisture, prevents car lamp from fogging, prolongs the life.

Description

Technical Field

[0001] This utility model belongs to the technical field of vehicle headlight rear cover, specifically, it relates to a moisture-proof and breathable replaceable structure for vehicle headlights. 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 replaceable moisture-proof and breathable 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 lifespan of the lights.

[0006] To solve the above-mentioned technical problems, this utility model discloses a replaceable moisture-proof and breathable structure for vehicle lights, including a rear shell, an EPDM moisture-proof valve, a PTFE breathable membrane, a bag-type desiccant, and a breathable end cap. The rear housing has a main cavity, a recessed secondary cavity at the bottom center of the main cavity, an upward-protruding mounting boss at the center of the secondary cavity, a mounting hole at the center of the mounting boss, a venting ring protrusion on the inner wall of the mounting hole, and multiple venting holes evenly arranged radially on the venting ring protrusion; the outer ring of the rear housing has a sealing ring, which is installed on the headlight body by bolt fastening or threaded connection to achieve a sealed fit with the headlight.

[0007] According to one embodiment of this utility model, the EPDM moisture barrier valve is umbrella-shaped, including a rod portion that snaps into a vent ring protrusion and an umbrella portion that presses against the outside of the mounting boss; the rod portion is inverted, exposing the vent hole after snapping, ensuring that airflow can pass through the vent hole to form a flow channel with the moisture barrier valve; the inner ring of the umbrella portion has an inward concave arc facing the vent 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 portion; the annular protrusion has a taper to enhance the sealing fit with the mounting boss; 6-8 micro exhaust notches are arranged circumferentially along the outer ring edge of the umbrella portion, the exhaust notches are 0.3-0.5mm deep and 1-1.2mm wide, and the edges of the notches are rounded to avoid aging cracks caused by stress concentration.

[0008] According to one embodiment of the present invention, a PTFE breathable membrane is laser-welded to the outside of the secondary cavity and completely shields the EPDM moisture-proof valve, thereby blocking external liquid water while allowing gas to pass through, thus enhancing the moisture-proof effect.

[0009] According to one embodiment of this utility model, two bag-type desiccants are placed in the main cavity to absorb moisture from the air entering the vehicle headlight. Three to five parallel pleats (each 1-2 mm wide) are placed along one side edge of each bag-type desiccant to increase the contact area with air. The other two sides are sealed with a double-line heat-press seal and silicone strip edging (heat-press seam width 0.5 mm, silicone strip protruding 0.3 mm from the bag edge). This creates a micro-pressure seal when in contact with the inner wall of the rear shell, preventing unfiltered air from flowing directly into the bag from the edge. Micro-perforations with a diameter of 0.1-0.3 mm (hole spacing 2-3 mm) are evenly distributed on the bag surface to ensure rapid moisture penetration while preventing desiccant particles from leaking out.

[0010] According to one embodiment of the present invention, the ventilated end cap is disposed on the main cavity and is connected to the rear shell by a snap fastener to achieve quick assembly and disassembly; the ventilated end cap has multiple ventilated arc holes, which are arranged in an array around the center circumference of the ventilated end cap to facilitate the entry of external air into the main cavity; the side wall of the main cavity and the inner side of the ventilated end cap are provided with multiple raised ribs to form a labyrinth-like airflow channel, which prolongs the flow path of air in the main cavity and improves the moisture absorption efficiency of the desiccant.

[0011] The working principle of this utility model is as follows: When the internal and external pressures of the headlight are balanced, the annular protrusion of the EPDM moisture-proof valve presses tightly against the mounting boss, forming a completely sealed state and preventing external moisture from entering. When the headlights are turned on, the internal temperature rises and generates positive pressure (when the pressure reaches 0.5-5.8 kPa). The pressure pushes the EPDM moisture barrier valve open from the inside out, causing the edge of the umbrella to curl up. The internal gas is discharged through the vent holes, the gap at the edge of the moisture barrier valve, and the PTFE breathable membrane in sequence, releasing the internal pressure. When the headlights are turned off, the internal temperature drops, creating negative pressure. External pressure acts on the surface of the EPDM moisture-proof valve, causing it to deform. The annular protrusion contacts the mounting boss, and the edge of the umbrella-shaped part lifts up, creating a gap. External air enters the headlight through the venting arc hole of the venting end cap, the main cavity (which fully contacts the bag-type desiccant to absorb moisture), the secondary cavity, the gap at the edge of the moisture-proof valve, and the venting hole, achieving pressure balance. At the same time, the incoming air remains dry after being absorbed by the desiccant, preventing fogging inside the headlights.

[0012] When the bag desiccant becomes saturated with moisture, it can be replaced directly by removing the vent end cap, without having to replace the entire structural assembly, thus reducing maintenance costs.

[0013] Compared with the prior art, the present invention can achieve the following technical effects: Through the umbrella-shaped structure and specific opening pressure design of the EPDM moisture barrier valve, an adaptive response of positive pressure exhaust and negative pressure intake inside the headlight is achieved, avoiding damage to the housing due to excessive pressure or abnormal intake caused by negative pressure. The PTFE breathable membrane works in conjunction with the EPDM moisture-proof valve to achieve dual moisture isolation. The pleated design and airflow channels of the bag-type desiccant improve moisture absorption efficiency and effectively prevent fogging inside the headlights. The ventilated end cap uses a snap-fit ​​connection, and the desiccant can be replaced separately, reducing maintenance costs; The EPDM moisture barrier valve features a ring-shaped raised tapered design and rounded corners for the miniature exhaust notch, among other details that enhance the structure's sealing performance and durability, extending its service life.

[0014] 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

[0015] 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: Figure 1 This is a cross-sectional schematic diagram of a replaceable moisture-proof and breathable structure for vehicle lights according to an embodiment of this utility model; Figure 2 This is a schematic diagram of the ventilated end cap of an embodiment of this utility model; Figure 3 This is a schematic diagram of the EPDM moisture barrier valve in an embodiment of this utility model.

[0016] Attached Figure Labels

[0017] Rear housing 10, main cavity 11, secondary cavity 12, mounting boss 13, mounting clip hole 14, vent ring protrusion 15, EPDM moisture barrier valve 20, rod 21, umbrella part 22, annular protrusion 23, PTFE breathable membrane 30, bag desiccant 40, breathable end cap 50, breathable arc hole 51, rib 60, sealing ring 70. Detailed Implementation

[0018] 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.

[0019] like Figure 1 As shown, a replaceable moisture-proof and breathable structure for vehicle lights includes a rear housing 10, an EPDM moisture-proof valve 20, a PTFE breathable membrane 30, a bag-type desiccant 40, and a breathable end cap 50. The rear housing 10 is injection molded from ABS material and has a main cavity 11. The bottom center of the main cavity 11 has an integrally formed recessed secondary cavity 12. The center of the secondary cavity 12 has an upwardly protruding mounting boss 13. The center of the mounting boss 13 has a mounting hole 14. The inner wall of the mounting hole 14 has an integrally formed vent ring protrusion 15. The vent ring protrusion 15 has 6 vent holes evenly opened radially. The outer ring of the rear housing 10 is embedded with a nitrile rubber sealing ring 70, which is installed on the headlight body by bolt fastening or thread connection to achieve a sealed fit with the headlight.

[0020] The EPDM moisture barrier valve 20 is molded from EPDM rubber and has an overall umbrella shape, such as... Figure 3 As shown, it includes a pole 21 and an umbrella 22; the pole 21 is inverted and snaps into the vent ring protrusion 15, and the vent hole is exposed after snapping; the inner ring of the umbrella 22 has an inward concave arc 221 facing the vent hole 151, and the outer ring is integrally formed with an annular protrusion 23 that presses against the mounting boss 13. The taper of the annular protrusion 23 is 15° and the interval between it and the edge of the umbrella 22 is 2mm; the outer ring edge of the umbrella 22 is provided with 6 micro exhaust notches 223 at intervals along the circumference, with a depth of 0.4mm, a width of 1mm, and a radius of 0.2mm for the corner of the notch edge.

[0021] The PTFE breathable membrane 30 is 0.1mm thick and is fixed to the outside of the secondary cavity 12 by laser welding (welding temperature 200℃, welding width 0.5mm), completely covering the EPDM moisture barrier valve 20 and providing waterproof and breathable effects.

[0022] Two bag-type desiccants 40, each with a capacity of 15g, are placed inside the main cavity 11. The two sides of the bag-type desiccants 40 are covered with four parallel pleats 41, each 1.5mm wide. The other two sides are sealed with double-line heat-press sealing 42, with a seam width of 0.5mm. At the same time, a silicone strip is provided for edging 43, which protrudes 0.3mm from the edge of the bag body. The bag surface is evenly distributed with micro-perforations 44 of 0.2mm diameter and a spacing of 2.5mm between the perforations.

[0023] The ventilated end cap 50 is injection molded from PP material and is connected to the rear shell 10 by three circumferentially distributed buckles. The ventilated end cap 50 has multiple ventilated arc holes 51 arranged in a circular array around the center. The side wall of the main cavity 11 and the inner side of the ventilated end cap 50 are integrally formed with multiple ribs 60, with a cross-sectional diameter of 0.9 mm and a spacing of 3.5 mm. The ribs are interlaced to form a maze-like distribution, while gaps are reserved to provide air passages.

[0024] Please refer to Figure 3 ,in Figure 3 (a) is a schematic diagram of the EPDM moisture-proof valve outlet of an embodiment of this utility model. Figure 3 (b) is a schematic diagram of the air intake of the EPDM moisture barrier valve according to an embodiment of the present invention. The working process of this embodiment is as follows: Pressure balance state: The annular protrusion 23 of the EPDM moisture barrier valve 20 is tightly pressed against the mounting boss 13, forming a sealed state; Positive pressure exhaust: When the internal pressure rises to above 0.5 kPa after the headlights are turned on, the umbrella part 22 of the EPDM moisture barrier valve 20 is pushed open, and the internal gas is discharged through the vent, the gap at the edge of the umbrella part, and the PTFE breathable membrane 30. Negative pressure air intake: After the headlights are turned off, a negative pressure is formed inside. External air enters the main cavity 11 through the venting arc hole 51 of the venting end cover 50. After contacting the bag desiccant 40 and absorbing moisture, it enters the headlight through the secondary cavity 12, the edge gap of the umbrella part 22, and the venting hole until the pressure is balanced. Desiccant replacement: Remove the buckle of the vent cap 50, take out the old bag desiccant 40, replace with new desiccant, and then re-fasten the cap.

[0025] 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 replaceable moisture-proof and breathable structure for vehicle lights, characterized in that, include: The rear housing has a main cavity, a recessed secondary cavity at the bottom center of the main cavity, an upwardly protruding mounting boss at the center of the secondary cavity, a mounting hole at the center of the mounting boss, a venting ring protrusion on the inner wall of the mounting hole, and multiple venting holes radially arranged on the venting ring protrusion. An EPDM moisture-proof valve is snapped onto the vent ring protrusion. The EPDM moisture-proof valve is umbrella-shaped, having a rod portion that snaps into the vent ring protrusion and an umbrella portion that presses against the outside of the mounting boss. The rod portion is inverted and exposes the vent hole. The inner ring of the umbrella portion has an inward concave arc facing the vent hole, and the outer ring has an annular protrusion that presses against the mounting boss. The annular protrusion is spaced from the edge of the umbrella portion. A PTFE breathable membrane is laser-welded to the outside of the secondary cavity and used to shield the EPDM moisture-proof valve. Two bag-type desiccants are contained within the main cavity; A ventilated end cap is provided on the main cavity, and the ventilated end cap has a ventilated arc hole; The main cavity sidewall and the inner side of the ventilated end cap have multiple raised ribs.

2. The replaceable moisture-proof and breathable structure for vehicle lights according to claim 1, characterized in that, The ventilated end cap is connected to the rear housing by a snap-fit ​​connection; the ventilated arc holes are provided in multiple rows and arranged in a circular array around the center of the ventilated end cap.

3. The replaceable moisture-proof and breathable structure for vehicle lights according to claim 1, characterized in that, The bag-type desiccant has 3-5 parallel pleats on one side edge, each pleat being 1-2 mm wide; the other two side edges are sealed with double-line heat-press sealing and silicone strip edging, wherein the heat-press seam is 0.5 mm wide and the silicone strip protrudes 0.3 mm from the edge of the bag body; the bag surface is evenly distributed with micro-perforations of 0.1-0.3 mm in diameter, with a perforation spacing of 2-3 mm.

4. The replaceable moisture-proof and breathable structure for vehicle lights according to claim 1, characterized in that, The annular protrusion is tapered.

5. The replaceable moisture-proof and breathable structure for vehicle lights according to claim 1, characterized in that, The EPDM moisture-proof valve has 6-8 micro exhaust notches spaced circumferentially along the outer edge of the umbrella part. The exhaust notches are 0.3-0.5mm deep and 1-1.2mm wide, and the edges of the notches are rounded.

6. The replaceable moisture-proof and breathable structure for vehicle lights according to claim 1, characterized in that, When the internal and external pressures of the headlight are balanced, the EPDM moisture-proof valve is completely sealed. When the headlight is on, the internal temperature rises, generating pressure that opens the EPDM moisture-proof valve from the inside out, releasing the internal pressure. When the headlight is off, the internal temperature drops, creating negative pressure. The external pressure acts on the surface of the EPDM moisture-proof valve, deforming it. At this time, the annular protrusion on the inner side of the EPDM moisture-proof valve contacts the mounting boss, causing the edge of the EPDM moisture-proof valve 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 main cavity, reacting with the bag-type desiccant inside to absorb moisture, ensuring that the air entering the headlight is relatively dry.

7. The replaceable moisture-proof and breathable structure for vehicle lights according to claim 1, characterized in that, The EPDM moisture barrier valve has a venting opening pressure of 0.5-5.8 kPa.

8. The replaceable moisture-proof and breathable structure for vehicle lights according to claim 1, characterized in that, The rear housing has a sealing ring on its outer ring, which is fastened to the headlight by bolts or thread.

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