A vehicle headlight anti-fog device and a vehicle headlight structure

Abstract

This application provides a vehicle headlight defogging device and headlight structure. The headlight defogging device includes a valve body with a mounting groove on one side and a vent at the bottom of the mounting groove, which is connected to an airflow passage penetrating the valve body; a diaphragm element installed in the mounting groove to cover the vent; a pressure plate structure disposed on the surface of the diaphragm element, with a receiving cavity on the side of the pressure plate structure near the diaphragm element to accommodate deformation of the diaphragm element; and an air vent at the edge of the pressure plate structure, which connects the vent to the outside of the valve body. The technical problem solved by this invention is that while the venting component balances the pressure difference between the inside and outside of the headlight, it also brings moisture from outside the headlight into the headlight, causing fogging inside the headlight.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, and more specifically, to a vehicle headlight anti-fog device and a vehicle headlight structure. Background Technology

[0002] Car headlights typically have ventilation components to balance the pressure difference between the inside and outside of the headlight, and moisture in the inside and outside of the headlight also flows between them through the ventilation components.

[0003] However, while the ventilation components balance the pressure difference between the inside and outside of the headlight, they can also bring moisture from outside the headlight into the headlight, causing fogging inside the headlight. Utility Model Content

[0004] The technical problem solved by this invention is that while the ventilated component balances the pressure difference between the inside and outside of the headlight, it also brings moisture from outside the headlight into the headlight, causing fogging inside the headlight.

[0005] To solve the above problems, this utility model provides a vehicle headlight anti-fog device, including: a valve body, a mounting groove on one side of the valve body, a ventilation port at the bottom of the mounting groove, and the ventilation port being connected to an airflow interaction channel that runs through the valve body; A membrane element is installed in the mounting groove to cover the ventilation port; The pressure plate structure is set on the surface of the diaphragm component. The side of the pressure plate structure near the diaphragm component has a receiving cavity to accommodate the deformation of the diaphragm component. An air vent is opened at the edge of the pressure plate structure, and the air vent connects to the air exchange port and the outside of the valve body. Specifically, during the process of airflow flowing out from the airflow interaction channel toward the air exchange port, the diaphragm on the air exchange port opens; during the process of airflow flowing into the airflow interaction channel from the air outlet, the air exchange port is partially blocked by the diaphragm.

[0006] Compared with existing technologies, the technical effects achieved by this solution are as follows: During the air intake process, the air exchange port is partially blocked by the diaphragm component, while during the air exhaust process, the diaphragm component deforms towards the receiving cavity, that is, away from the air exchange port, so that the air exchange port is opened. This ensures that the opening of the air exchange port during the air exhaust process is greater than that during the air intake process, thereby achieving the effect of airflow being difficult to enter and easy to exit, effectively suppressing the occurrence of fogging inside the headlights.

[0007] In one embodiment of this utility model, a gap is formed between the side wall of the mounting groove and the air vent. The clearance is achieved by the pressure plate structure and / or valve body clearance.

[0008] Compared to existing technologies, the technical benefits of this solution are as follows: By rationally designing the gap, the obstruction of the vent by the valve body and pressure plate structure is reduced, thereby ensuring effective ventilation of the headlights. For example, the gap is achieved by the valve body making room for it; that is, the mounting groove of the valve body forms a clearance structure to create a gap between it and the outer wall of the pressure plate structure. Thus, the vent can achieve gas exchange between the internal and external environments of the headlights through this gap. Of course, this gap can also be achieved by the pressure plate structure making room for it, which will not be elaborated upon here.

[0009] In one embodiment of this utility model, the distance between the ventilation port and the air outlet is greater than 0; and / or The gap width formed between the side wall of the mounting groove and the air vent is greater than 0.1 mm.

[0010] In one embodiment of this utility model, the pressure plate structure includes a body part and a support part; The support portion is located on the side of the main body facing the film component; the support portion is arranged around the edge of the main body and together with the main body forms a receiving cavity. The air vents are formed in the support section, and the sum of the opening areas of the air vents accounts for 5-50% of the surface area of ​​the support section.

[0011] In one embodiment of this utility model, the support portion includes a first support structure and / or a second support structure, and the vent is formed inside the first support structure or the second support structure, or between the two.

[0012] In one embodiment of this utility model, the second support structure includes a plurality of support blocks spaced apart from each other; Among the multiple support blocks, the support block closest to the first support structure forms a first gap with the first support structure; A second spacing is formed between two adjacent support blocks in a plurality of support blocks; The first and second spacings together form an air passage.

[0013] Compared with existing technologies, the technical effects achieved by this solution are as follows: Combining the layout characteristics of the first and / or second support structures on the main body, when airflow exits through the air exchange port from the airflow interaction channel, the portion of the diaphragm element corresponding to the first and / or second spacing, being unpressed, is lifted towards the main body, thus forming an air outlet. When the air pressure inside the headlight is high, the opening of the air outlet increases, improving airflow efficiency. The air outlet is formed within the area enclosed by the air passage.

[0014] In one embodiment of this utility model, the valve body forms a recess in the mounting groove, the air vent is formed in the recess, and a diaphragm covers the recess along the positive projection direction of the recess. When the diaphragm deforms toward the direction of the settling tank, an air intake channel is formed between the diaphragm and the settling tank, connecting the air inlet.

[0015] Compared with existing technologies, the technical effects achieved by this solution are as follows: To ensure that airflow from outside the headlight can enter the headlight to balance the air pressure, a groove is set at the position of the vent on the valve body. The combination of the groove and the vent prevents concentrated deformation of the diaphragm component at the vent. That is, under extreme negative pressure, the diaphragm component deforms towards both the groove and the vent, preventing complete blockage of the vent. This ensures smooth air intake and avoids the headlight's interior being under negative pressure for extended periods.

[0016] In one embodiment of this utility model, the distance between any end of the settling tank and the air outlet is greater than 0; and / or The depth of the settling tank is greater than 0.1 mm.

[0017] Furthermore, by setting the distance between any end of the sink and the air outlet to be greater than 0, overlapping of their positions is avoided. This means that the sink and the air outlet are offset axially relative to the valve body to prevent straight airflow, thereby reducing the risk of fogging inside the headlights. It should be emphasized that the 0.1mm limit in this technical solution is based on the processing precision of the injection molding process, but it does not mean that the depth of the sink cannot be between 0 and 0.1mm. That is, 0-0.1mm should also fall within the protection scope of this application, but preferably is greater than 0.1mm. The advantage of preferably having a depth greater than 0.1 mm is that processing is more stable and convenient within this depth range, and the yield is higher.

[0018] In one embodiment of this utility model, a boss is provided on the side wall of the mounting groove of the valve body; the pressure plate structure is arranged adjacent to the boss; The pressure plate structure has a raised height relative to the boss, so that the edge of the pressure plate structure near the boss forms an air passage for communication with the air exchange port.

[0019] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: by forming a boss on the valve body, a lifting height is created between it and the pressure plate structure, which facilitates the removal of the pressure plate structure from the valve body, thus providing convenience for the installation of the pressure plate structure; in addition, by extending the air vent to the part of the pressure plate structure corresponding to the lifting height, the limitation that the air vent can only achieve airflow exchange between the inside and outside of the headlight through the gap is avoided, thereby improving the overall ventilation efficiency.

[0020] In one embodiment of this utility model, a filling groove for accommodating desiccant is provided on the side of the valve body away from the diaphragm element; The headlight defogging device also includes a first waterproof and breathable membrane that seals the filling groove; An air exchange structure containing airflow interaction channels is formed within the filling groove; The circumferential surface of the ventilation structure is provided with reinforcing ribs that connect to the bottom and / or inner wall of the filling groove; and / or The headlight defogging device also includes a second waterproof and breathable membrane, which covers the opening of the mounting slot.

[0021] On the other hand, this utility model also provides a vehicle lamp structure, including: a vehicle lamp anti-fog device as in any of the above examples.

[0022] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: it can achieve the technical effects corresponding to any of the above examples, which will not be elaborated here.

[0023] By adopting the technical solution of this utility model, the following technical effects can be achieved: (1) During the intake process, the air exchange port is partially blocked by the diaphragm component, while during the exhaust process, the diaphragm component deforms toward the receiving cavity, that is, away from the air exchange port, so that the air exchange port is opened, ensuring that the opening of the air exchange port during the exhaust process is greater than the opening of the air exchange port during the intake process, thereby achieving the effect of airflow being difficult to enter and easy to exit, effectively suppressing the occurrence of fogging inside the headlights. (2) By setting a groove at the position of the corresponding air exchange port on the valve body, the combination of the groove and the air exchange port avoids the situation of concentrated deformation of the diaphragm at the air exchange port. That is, under the action of extreme negative pressure, the diaphragm deforms towards the groove and the air exchange port respectively, avoiding the situation of the diaphragm completely blocking the air exchange port, thereby ensuring the smooth progress of the air intake process and avoiding the long-term negative pressure state inside the headlight. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 An exploded structural diagram of the vehicle headlight anti-fog device provided in this embodiment of the utility model; Figure 2 An exploded structural diagram of the vehicle headlight anti-fog device from another perspective, as provided in this embodiment of the utility model; Figure 3 A partial structural diagram of a vehicle headlight fog defogging device; Figure 4 for Figure 3 A cross-sectional view along the aa direction; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is a schematic diagram showing the fit between the boss and the pressure plate structure. Figure 7 This is a schematic diagram showing the fit between the pressure plate structure and the film component; Figure 8 A partial structural schematic diagram of a vehicle headlight anti-fog device with a gap formed by the valve body's clearance, provided in an embodiment of this utility model; Figure 9 for Figure 8 Enlarged view of point B in the middle.

[0025] Explanation of reference numerals in the attached figures: 102. First gap; 103. Second gap; 104. Gap; 10. Valve body; 11. Ventilation port; 12. Mounting groove; 121. Side wall; 13. Airflow interaction channel; 14. Settling groove; 15. Filling groove; 16. Ventilation structure; 17. Boss; 18. Reinforcing rib; 20. Membrane component; 30. Pressure plate structure; 31. Body part; 32. Air outlet; 33. Receiving cavity; 34. First support structure; 35. Support part one; 36. Support part two; 37. Support block three; 41. First waterproof and breathable membrane; 42. Second waterproof and breathable membrane. Detailed Implementation

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0027] In related technologies, when the headlights are turned off, the temperature of the gas inside the headlights gradually decreases, creating negative pressure (relative to the outside of the headlights). This causes external gas to be drawn into the headlights, opening the valve plate in the venting component. Since the existing valve plate is directly opposite the air inlet in the venting component, gas from the external environment directly enters the headlights through the valve plate, resulting in a high speed at which gas (especially water vapor) enters the headlights, making it difficult to effectively suppress fogging inside the headlights.

[0028] To solve the above problems, see [link to relevant documentation]. Figures 1-9 This utility model provides a vehicle headlight defogging device. The vehicle headlight defogging device includes a valve body 10, a diaphragm element 20, and a pressure plate structure 30. A mounting groove 12 is provided on one side of the valve body 10, and a ventilation port 11 is opened at the bottom of the mounting groove 12. The ventilation port 11 is connected to an airflow interaction channel 13 that penetrates the valve body 10. The diaphragm element 20 is installed in the mounting groove 12 to cover the ventilation port 11.

[0029] The pressure plate structure 30 is disposed on the surface of the film component 20. The side of the pressure plate structure 30 near the film component 20 is provided with a receiving cavity 33 to accommodate the deformation of the film component 20. An air passage 32 is opened at the edge of the pressure plate structure 30, and the air passage 32 connects the air exchange port 11 and the outside of the valve body 10. During the process of airflow flowing out from the airflow interaction channel 13 toward the air exchange port 11, the diaphragm 20 on the air exchange port 11 opens; during the process of airflow flowing into the airflow interaction channel 13 from the air outlet 32, the air exchange port 11 is partially blocked by the diaphragm 20.

[0030] Specifically, a diaphragm element 20 and a pressure plate structure 30 are stacked sequentially on the valve body 10. When the airflow flows from the airflow interaction channel 13 toward the air exchange port 11, it causes the diaphragm element 20 covering the air exchange port 11 to move away from the air exchange port 11, that is, the diaphragm element 20 deforms toward the receiving cavity 33. Thus, with the presence of the receiving cavity 33, the diaphragm element 20 covering the air exchange port 11 can be opened, thereby forming an exhaust channel between the diaphragm element 20 and the bottom surface of the mounting groove 12.

[0031] During the process of airflow flowing from the air inlet 32 ​​into the airflow interaction channel 13, the air pressure inside the headlight is less than the air pressure outside the headlight, that is, the headlight is in a negative pressure state. Therefore, under the action of the air pressure outside the headlight, the diaphragm 20 deforms in the direction of squeezing the air exchange port 11, so that the air exchange port 11 is partially blocked by the diaphragm 20. Therefore, in the two processes of air intake (i.e., airflow flows into the airflow interaction channel 13 through the air exchange port 11) and air exhaust (i.e., airflow flows out of the airflow interaction channel 13 through the air exchange port 11), the different matching relationships between the diaphragm component 20 and the air exchange port 11 achieve the effect of airflow being difficult to enter and easy to exit. Specifically, during the air intake process, the air exchange port 11 is partially blocked by the diaphragm component 20, while during the air exhaust process, the diaphragm component 20 deforms towards the receiving cavity 33, that is, away from the air exchange port 11, so that the air exchange port 11 is opened, ensuring that the opening degree of the air exchange port 11 during the air exhaust process is greater than the opening degree of the air exchange port 11 during the air intake process, thereby achieving the effect of airflow being difficult to enter and easy to exit.

[0032] In summary, during the air intake process, the diaphragm component 20, under the negative pressure inside the headlight, partially blocks the air exchange port 11, affecting the process by which airflow (especially water vapor) introduced from outside the headlight enters the headlight through the air exchange port 11. This reduces the airflow entering the headlight per unit time and also reduces the total amount of moisture entering the headlight per unit time, preventing a large amount of airflow (especially water vapor) from entering the headlight instantly and effectively suppressing the occurrence of fogging inside the headlight.

[0033] Combination Figure 6 and Figure 9Preferably, a gap 104 is formed between the side wall 121 of the mounting groove 12 and the air outlet 32; the gap 104 is obtained by the clearance of the pressure plate structure 30 and / or the valve body 10.

[0034] Specifically, by rationally designing the gap 104, the obstruction effect caused by the valve body 10 and the pressure plate structure 30 on the vent 32 is reduced, thereby ensuring the internal and external ventilation effect of the headlight. For example, the gap 104 is obtained by the valve body 10 making room, that is, a clearance structure is formed on the mounting groove 12 of the valve body 10 to form a gap 104 between it and the outer wall of the pressure plate structure 30. Thus, the vent 32 can achieve gas exchange between the internal and external environments of the headlight through this gap 104. Of course, the gap 104 can also be obtained by the pressure plate structure 30 making room, which will not be elaborated here.

[0035] Preferably, the distance between the air exchange port 11 and the air passage port 32 is greater than 0; and / or The gap 104 formed between the side wall 121 of the mounting groove 12 and the air vent 32 has a width greater than 0.1 mm.

[0036] It should be emphasized that the 0.1mm limit in this application is based on the processing precision of the injection molding process, but it does not mean that the width of the gap 104 cannot be a value between 0 and 0.1mm. That is, 0-0.1mm should also fall within the protection scope of this application, but it is preferred to be greater than 0.1mm. In addition, by setting the distance between the air exchange port 11 and the air passage port 32 to be greater than 0, the overlapping of their positions is avoided. That is, the air exchange port 11 and the air passage port 32 are staggered in the axial direction of the valve body 10, so as to prolong the process of airflow entering and exiting the headlight anti-fog device, avoid the airflow going straight in and out, and thus reduce the risk of fogging inside the headlight.

[0037] Preferably, the pressure plate structure 30 includes a body portion 31 and a support portion; the support portion is disposed on the side of the body portion 31 facing the film member 20; the support portion is arranged around the edge of the body portion 31 and together with the body portion 31 forms a receiving cavity 33; air vents 32 are formed in the support portion, and the sum of the opening areas of the air vents 32 accounts for 5-50% of the surface area of ​​the support portion. For example, the sum of the opening areas accounts for 5%, 10%, 15%, 50% of the surface area of ​​the support portion and any value within this range.

[0038] Preferably, the support portion includes a first support structure 34 and / or a second support structure, and the vent 32) is formed inside the first support structure 34 or the second support structure, or between the two.

[0039] Preferably, the second support structure includes a plurality of support blocks spaced apart from each other; the support block closest to the first support structure 34 among the plurality of support blocks forms a first gap 102 with the first support structure 34; the two adjacent support blocks among the plurality of support blocks form a second gap 103; wherein the first gap 102 and the second gap 103 constitute an air passage 32.

[0040] In a specific example, the support part includes only a first support structure 34, which is a C-shaped ring continuously arranged around the edge of the body part 31, and the gap of the C-shaped ring forms an air vent 32.

[0041] In a specific example, the support part includes only the second support structure, and several support blocks are arranged at intervals to form a gear-shaped structure. The two adjacent support blocks form a second spacing 103, and the second spacing 103 forms an air passage 32.

[0042] In a specific example, the first support structure 34 is continuously arranged around the edge of the body portion 31, while a plurality of support blocks are spaced apart from the first support structure 34 and also arranged around the edge of the body. The first support structure 34 and the plurality of support blocks are supported on the surface of the film member 20, so that the body portion 31 has a raised height relative to the side wall 121 of the mounting groove 12. For ease of understanding, the support blocks adjacent to the first support structure 34 among the plurality of support blocks are defined as support block one 35 and support block two 36. Support block one 35 is spaced apart from one end of the first support structure 34, and support block two 36 is also spaced apart from the other end of the first support structure 34. The first spacing 102 is formed between support block one 35 and one end of the first support structure 34, and between support block two 36 and the other end of the first support structure 34.

[0043] Furthermore, the support block located between support block 1 35 and support block 2 36 is defined as support block 3 37, and the second spacing 103 is formed between support block 3 37 and support block 1 35, and between support block 3 37 and support block 2 36.

[0044] During the airflow process, as the airflow exits through the air exchange port 11 from the airflow interaction channel 13, the edge of the diaphragm 20 is pressed by the first support structure 34 and / or the second support structure, while the middle portion of the diaphragm 20 is deformed towards the receiving cavity 33 by the airflow, thus changing the diaphragm 20 from a blocked state to an open state. Under the continuous impact of the airflow, the airflow diffuses from the middle portion of the diaphragm 20 towards its edge portion, forming a force that carries the diaphragm 20 away from the plane attached to the air exchange port 11, maintaining unobstructed airflow.

[0045] Based on the arrangement of the first support structure 34 and / or the second support structure on the main body 31, the portion of the thin film 20 corresponding to the first spacing 102 and / or the second spacing 103 is not compressed, causing it to be lifted towards the main body 31, thereby forming an air outlet. When the air pressure inside the headlight is high, the opening of the air outlet increases, improving the air outlet efficiency. The air outlet is formed within the area enclosed by the air passage 32.

[0046] Preferably, the valve body 10 has a recess 14 formed in the mounting groove 12, and the air inlet 11 is formed in the recess 14. Along the positive projection direction of the recess 14, the diaphragm 20 covers the recess 14. When the diaphragm 20 deforms toward the direction close to the recess 14, an air intake channel communicating with the air inlet 11 is formed between the diaphragm 20 and the recess 14.

[0047] Preferably, the distance between any end of the sink 14 and the air outlet 32 ​​is greater than 0; and / or the depth of the sink 14 is greater than 0.1 mm. It should be emphasized that the limitation of 0.1 mm in this technical solution is based on the processing accuracy of the injection molding process, but it does not mean that the depth of the sink 14 cannot be a value between 0 and 0.1 mm. That is, 0-0.1 mm should also fall within the protection scope of this application, but it is preferred to be greater than 0.1 mm.

[0048] Furthermore, the depth of the settling groove 14 is any value greater than 0.1 mm, provided that it does not penetrate the valve body 10.

[0049] Specifically, under the negative pressure inside the headlight, the diaphragm 20 is adsorbed onto the air vent 11. If the pressure difference between the inside and outside of the headlight is too large, and given the small opening of the air vent 11 on the valve body 10, the air vent 11 is easily completely blocked by the diaphragm 20. In this case, the airflow cannot enter the airflow interaction channel 13 in time, thus failing to balance the air pressure inside and outside the headlight. This results in the headlight being in a negative pressure state for a long time, which in turn damages the internal components of the headlight.

[0050] Therefore, to ensure that the airflow outside the headlight can enter the headlight to balance the air pressure, a groove 14 is provided on the valve body 10 at the position corresponding to the air exchange port 11. By combining the groove 14 and the air exchange port 11, the diaphragm element 20 is prevented from undergoing concentrated deformation at the air exchange port 11. That is, under the action of extreme negative pressure, the diaphragm element 20 deforms towards both the groove 14 and the air exchange port 11, preventing the diaphragm element 20 from completely blocking the air exchange port 11. This ensures that the air intake process proceeds smoothly and prevents the headlight from being in a negative pressure state for a long time.

[0051] Furthermore, during the air intake process, the diaphragm component 20 is subjected to negative pressure, causing the middle part to be concave towards the groove 14 and the air exchange port 11, while the edge of the diaphragm component 20 is raised away from the mounting groove 12. Thus, the airflow first enters the air intake channel one formed between the raised part of the diaphragm component 20 and the bottom surface of the mounting groove 12 through the air outlet 32, then through the air intake channel two between the diaphragm component 20 and the groove 14, and finally enters the airflow interaction channel 13 through the air exchange port 11, thereby completing the balance of air pressure inside and outside the headlight.

[0052] For example, the settling tank 14 has a Y-shaped structure.

[0053] Combination Figures 4-6 Preferably, the valve body 10 has a boss 17 at the position of the side wall 121 of the mounting groove 12; the pressure plate structure 30 is disposed in the mounting groove 12 with a clearance relative to the boss, and the pressure plate structure 30 is disposed adjacent to the boss 17; the pressure plate structure 30 has a lifting height relative to the boss 17 so that the edge of the pressure plate structure 30 near the boss 17 forms an air passage 32 for communicating with the air exchange port 11.

[0054] By forming a boss 17 on the valve body 10, a lifting height is created between it and the pressure plate structure 30, which facilitates the removal of the pressure plate structure 30 from the valve body 10, thus providing convenience for the installation of the pressure plate structure 30. In addition, by extending the air passage 32 to the part of the pressure plate structure 30 corresponding to the lifting height, the limitation that the air passage 32 can only realize the air exchange between the inside and outside of the headlight through the gap 104 is avoided, thereby improving the overall ventilation efficiency.

[0055] Preferably, the valve body 10 has a filling groove 15 for containing desiccant on the side away from the diaphragm element 20; the headlight defogging device also includes a first waterproof and breathable membrane 41 covering the filling groove 15; a ventilation structure 16 containing an airflow interaction channel 13 is formed inside the filling groove 15; the circumferential surface of the ventilation structure 16 is provided with reinforcing ribs 18 that connect to the bottom and / or inner wall of the filling groove 15; and / or The headlight defogging device also includes a second waterproof and breathable membrane 42, which covers the opening of the mounting groove 12.

[0056] Specifically, the overall structural strength of the valve body 10 is enhanced by setting reinforcing ribs 18; in addition, the second waterproof and breathable membrane 42 is set to block water vapor in the airflow, thereby reducing the water vapor content brought into the airflow interaction channel 13 by the airflow.

[0057] On the other hand, this embodiment of the invention also provides a vehicle lamp structure, specifically, the vehicle lamp structure includes the vehicle lamp anti-fog device as described in the above embodiments. Correspondingly, in this embodiment, the technical effects corresponding to any of the technical solutions in the above embodiments can be achieved, and will not be repeated here.

[0058] Although the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. An anti-fogging device for a vehicle light, characterized by include: A valve body (10) is provided with a mounting groove (12) on one side. A ventilation port (11) is provided at the bottom of the mounting groove (12). The ventilation port (11) is connected to an airflow interaction channel (13) that passes through the valve body (10). A film element (20) is installed in the mounting groove (12) to cover the ventilation port (11); A pressure plate structure (30) is disposed on the surface of the film element (20). The side of the pressure plate structure (30) near the film element (20) is provided with a receiving cavity (33) to accommodate the deformation of the film element (20). An air vent (32) is provided at the edge of the pressure plate structure (30), and the air vent (32) connects the air exchange port (11) to the outside of the valve body (10). During the process of airflow flowing out from the airflow interaction channel (13) toward the air exchange port (11), the thin film (20) on the air exchange port (11) opens; during the process of airflow flowing into the airflow interaction channel (13) from the air outlet (32), the air exchange port (11) is partially blocked by the thin film (20).

2. The vehicle headlight anti-fog device according to claim 1, characterized in that, A gap (104) is formed between the side wall (121) of the mounting groove (12) and the air vent (32); The gap (104) is provided by the clearance of the pressure plate structure (30) and / or the valve body (10).

3. The vehicle headlight defogging device according to any one of claims 1-2, characterized in that, The distance between the ventilation port (11) and the air outlet (32) is greater than 0; and / or The gap width between the sidewall (121) of the mounting groove (12) and the air vent (32) is greater than 0.1 mm.

4. The vehicle headlight defogging device according to any one of claims 1-2, characterized in that, The pressure plate structure (30) includes a body part (31) and a support part; The support portion is disposed on the side of the body portion (31) facing the film member (20); the support portion is arranged around the edge of the body portion (31) and together with the body portion (31) forms the receiving cavity (33). The air vent (32) is formed on the support portion, and the sum of the opening areas of the air vent (32) accounts for 5-50% of the surface area of ​​the support portion.

5. The vehicle headlight anti-fog device according to claim 4, characterized in that, The support includes a first support structure (34) and / or a second support structure, and the vent (32) is formed inside the first support structure (34) or the second support structure, or between the two.

6. The vehicle headlight anti-fog device according to claim 5, characterized in that, The second support structure includes a plurality of support blocks spaced apart from each other; Among the plurality of support blocks, the support block closest to the first support structure (34) forms a first spacing (102) with the first support structure (34); A second spacing (103) is formed between adjacent support blocks; The first spacing (102) and the second spacing (103) together form the air passage (32).

7. The vehicle headlight defogging device according to any one of claims 1 or 2, characterized in that, The valve body (10) forms a recess (14) in the mounting groove (12), the air vent (11) is formed in the recess (14), and the diaphragm (20) covers the recess (14) along the positive projection direction of the recess (14); When the film (20) deforms toward the sink (14), an air intake channel is formed between the film (20) and the sink (14) to connect with the air exchange port (11).

8. The vehicle headlight anti-fog device according to claim 7, characterized in that, The distance between any end of the settling tank (14) and the air outlet (32) is greater than 0; and / or The depth of the settling trough (14) is greater than 0.1 mm.

9. The vehicle headlight anti-fog device according to claim 1 or 2, characterized in that, The valve body (10) has a boss (17) on the side wall (121) of the mounting groove (12); the pressure plate structure (30) is arranged adjacent to the boss (17); The pressure plate structure (30) has a raised height relative to the boss (17) so that the edge of the pressure plate structure (30) near the boss (17) forms the air passage (32) for communicating with the air exchange port (11).

10. The vehicle headlight anti-fog device according to claim 1 or 2, characterized in that, The valve body (10) has a filling groove (15) for containing desiccant on the side away from the diaphragm (20); The vehicle headlight anti-fog device also includes a first waterproof and breathable membrane (41) that covers the filling groove (15); An air exchange structure (16) containing the airflow interaction channel (13) is formed within the filling groove (15); The circumferential surface of the ventilation structure (16) is provided with reinforcing ribs (18) that are connected to the bottom and / or inner wall of the filling groove (15); and / or The vehicle headlight anti-fog device also includes a second waterproof and breathable membrane (42), which covers the opening of the mounting groove (12).

11. A vehicle lamp structure characterized by comprising: include: The vehicle headlight anti-fog device as described in any one of claims 1-10.

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